1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/stat.h>
18 #include <sys/queue.h>
19 #include <sys/tree.h>
20 
21 #include <dirent.h>
22 #include <limits.h>
23 #include <stddef.h>
24 #include <string.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <time.h>
28 #include <fcntl.h>
29 #include <errno.h>
30 #include <unistd.h>
31 #include <sha1.h>
32 #include <zlib.h>
33 #include <fnmatch.h>
34 #include <libgen.h>
35 #include <uuid.h>
36 #include <util.h>
37 
38 #include "got_error.h"
39 #include "got_repository.h"
40 #include "got_reference.h"
41 #include "got_object.h"
42 #include "got_path.h"
43 #include "got_cancel.h"
44 #include "got_worktree.h"
45 #include "got_opentemp.h"
46 #include "got_diff.h"
47 
48 #include "got_lib_worktree.h"
49 #include "got_lib_sha1.h"
50 #include "got_lib_fileindex.h"
51 #include "got_lib_inflate.h"
52 #include "got_lib_delta.h"
53 #include "got_lib_object.h"
54 #include "got_lib_object_parse.h"
55 #include "got_lib_object_create.h"
56 #include "got_lib_object_idset.h"
57 #include "got_lib_diff.h"
58 #include "got_lib_gotconfig.h"
59 
60 #ifndef MIN
61 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
62 #endif
63 
64 #define GOT_MERGE_LABEL_MERGED	"merged change"
65 #define GOT_MERGE_LABEL_BASE	"3-way merge base"
66 
67 static const struct got_error *
68 create_meta_file(const char *path_got, const char *name, const char *content)
69 {
70 	const struct got_error *err = NULL;
71 	char *path;
72 
73 	if (asprintf(&path, "%s/%s", path_got, name) == -1)
74 		return got_error_from_errno("asprintf");
75 
76 	err = got_path_create_file(path, content);
77 	free(path);
78 	return err;
79 }
80 
81 static const struct got_error *
82 update_meta_file(const char *path_got, const char *name, const char *content)
83 {
84 	const struct got_error *err = NULL;
85 	FILE *tmpfile = NULL;
86 	char *tmppath = NULL;
87 	char *path = NULL;
88 
89 	if (asprintf(&path, "%s/%s", path_got, name) == -1) {
90 		err = got_error_from_errno("asprintf");
91 		path = NULL;
92 		goto done;
93 	}
94 
95 	err = got_opentemp_named(&tmppath, &tmpfile, path);
96 	if (err)
97 		goto done;
98 
99 	if (content) {
100 		int len = fprintf(tmpfile, "%s\n", content);
101 		if (len != strlen(content) + 1) {
102 			err = got_error_from_errno2("fprintf", tmppath);
103 			goto done;
104 		}
105 	}
106 
107 	if (rename(tmppath, path) != 0) {
108 		err = got_error_from_errno3("rename", tmppath, path);
109 		unlink(tmppath);
110 		goto done;
111 	}
112 
113 done:
114 	if (fclose(tmpfile) != 0 && err == NULL)
115 		err = got_error_from_errno2("fclose", tmppath);
116 	free(tmppath);
117 	return err;
118 }
119 
120 static const struct got_error *
121 read_meta_file(char **content, const char *path_got, const char *name)
122 {
123 	const struct got_error *err = NULL;
124 	char *path;
125 	int fd = -1;
126 	ssize_t n;
127 	struct stat sb;
128 
129 	*content = NULL;
130 
131 	if (asprintf(&path, "%s/%s", path_got, name) == -1) {
132 		err = got_error_from_errno("asprintf");
133 		path = NULL;
134 		goto done;
135 	}
136 
137 	fd = open(path, O_RDONLY | O_NOFOLLOW);
138 	if (fd == -1) {
139 		if (errno == ENOENT)
140 			err = got_error_path(path, GOT_ERR_WORKTREE_META);
141 		else
142 			err = got_error_from_errno2("open", path);
143 		goto done;
144 	}
145 	if (flock(fd, LOCK_SH | LOCK_NB) == -1) {
146 		err = (errno == EWOULDBLOCK ? got_error(GOT_ERR_WORKTREE_BUSY)
147 		    : got_error_from_errno2("flock", path));
148 		goto done;
149 	}
150 
151 	if (fstat(fd, &sb) != 0) {
152 		err = got_error_from_errno2("fstat", path);
153 		goto done;
154 	}
155 	*content = calloc(1, sb.st_size);
156 	if (*content == NULL) {
157 		err = got_error_from_errno("calloc");
158 		goto done;
159 	}
160 
161 	n = read(fd, *content, sb.st_size);
162 	if (n != sb.st_size) {
163 		err = (n == -1 ? got_error_from_errno2("read", path) :
164 		    got_error_path(path, GOT_ERR_WORKTREE_META));
165 		goto done;
166 	}
167 	if ((*content)[sb.st_size - 1] != '\n') {
168 		err = got_error_path(path, GOT_ERR_WORKTREE_META);
169 		goto done;
170 	}
171 	(*content)[sb.st_size - 1] = '\0';
172 
173 done:
174 	if (fd != -1 && close(fd) == -1 && err == NULL)
175 		err = got_error_from_errno2("close", path_got);
176 	free(path);
177 	if (err) {
178 		free(*content);
179 		*content = NULL;
180 	}
181 	return err;
182 }
183 
184 static const struct got_error *
185 write_head_ref(const char *path_got, struct got_reference *head_ref)
186 {
187 	const struct got_error *err = NULL;
188 	char *refstr = NULL;
189 
190 	if (got_ref_is_symbolic(head_ref)) {
191 		refstr = got_ref_to_str(head_ref);
192 		if (refstr == NULL)
193 			return got_error_from_errno("got_ref_to_str");
194 	} else {
195 		refstr = strdup(got_ref_get_name(head_ref));
196 		if (refstr == NULL)
197 			return got_error_from_errno("strdup");
198 	}
199 	err = update_meta_file(path_got, GOT_WORKTREE_HEAD_REF, refstr);
200 	free(refstr);
201 	return err;
202 }
203 
204 const struct got_error *
205 got_worktree_init(const char *path, struct got_reference *head_ref,
206     const char *prefix, struct got_repository *repo)
207 {
208 	const struct got_error *err = NULL;
209 	struct got_object_id *commit_id = NULL;
210 	uuid_t uuid;
211 	uint32_t uuid_status;
212 	int obj_type;
213 	char *path_got = NULL;
214 	char *formatstr = NULL;
215 	char *absprefix = NULL;
216 	char *basestr = NULL;
217 	char *uuidstr = NULL;
218 
219 	if (strcmp(path, got_repo_get_path(repo)) == 0) {
220 		err = got_error(GOT_ERR_WORKTREE_REPO);
221 		goto done;
222 	}
223 
224 	err = got_ref_resolve(&commit_id, repo, head_ref);
225 	if (err)
226 		return err;
227 	err = got_object_get_type(&obj_type, repo, commit_id);
228 	if (err)
229 		return err;
230 	if (obj_type != GOT_OBJ_TYPE_COMMIT)
231 		return got_error(GOT_ERR_OBJ_TYPE);
232 
233 	if (!got_path_is_absolute(prefix)) {
234 		if (asprintf(&absprefix, "/%s", prefix) == -1)
235 			return got_error_from_errno("asprintf");
236 	}
237 
238 	/* Create top-level directory (may already exist). */
239 	if (mkdir(path, GOT_DEFAULT_DIR_MODE) == -1 && errno != EEXIST) {
240 		err = got_error_from_errno2("mkdir", path);
241 		goto done;
242 	}
243 
244 	/* Create .got directory (may already exist). */
245 	if (asprintf(&path_got, "%s/%s", path, GOT_WORKTREE_GOT_DIR) == -1) {
246 		err = got_error_from_errno("asprintf");
247 		goto done;
248 	}
249 	if (mkdir(path_got, GOT_DEFAULT_DIR_MODE) == -1 && errno != EEXIST) {
250 		err = got_error_from_errno2("mkdir", path_got);
251 		goto done;
252 	}
253 
254 	/* Create an empty lock file. */
255 	err = create_meta_file(path_got, GOT_WORKTREE_LOCK, NULL);
256 	if (err)
257 		goto done;
258 
259 	/* Create an empty file index. */
260 	err = create_meta_file(path_got, GOT_WORKTREE_FILE_INDEX, NULL);
261 	if (err)
262 		goto done;
263 
264 	/* Write the HEAD reference. */
265 	err = write_head_ref(path_got, head_ref);
266 	if (err)
267 		goto done;
268 
269 	/* Record our base commit. */
270 	err = got_object_id_str(&basestr, commit_id);
271 	if (err)
272 		goto done;
273 	err = create_meta_file(path_got, GOT_WORKTREE_BASE_COMMIT, basestr);
274 	if (err)
275 		goto done;
276 
277 	/* Store path to repository. */
278 	err = create_meta_file(path_got, GOT_WORKTREE_REPOSITORY,
279 	    got_repo_get_path(repo));
280 	if (err)
281 		goto done;
282 
283 	/* Store in-repository path prefix. */
284 	err = create_meta_file(path_got, GOT_WORKTREE_PATH_PREFIX,
285 	    absprefix ? absprefix : prefix);
286 	if (err)
287 		goto done;
288 
289 	/* Generate UUID. */
290 	uuid_create(&uuid, &uuid_status);
291 	if (uuid_status != uuid_s_ok) {
292 		err = got_error_uuid(uuid_status, "uuid_create");
293 		goto done;
294 	}
295 	uuid_to_string(&uuid, &uuidstr, &uuid_status);
296 	if (uuid_status != uuid_s_ok) {
297 		err = got_error_uuid(uuid_status, "uuid_to_string");
298 		goto done;
299 	}
300 	err = create_meta_file(path_got, GOT_WORKTREE_UUID, uuidstr);
301 	if (err)
302 		goto done;
303 
304 	/* Stamp work tree with format file. */
305 	if (asprintf(&formatstr, "%d", GOT_WORKTREE_FORMAT_VERSION) == -1) {
306 		err = got_error_from_errno("asprintf");
307 		goto done;
308 	}
309 	err = create_meta_file(path_got, GOT_WORKTREE_FORMAT, formatstr);
310 	if (err)
311 		goto done;
312 
313 done:
314 	free(commit_id);
315 	free(path_got);
316 	free(formatstr);
317 	free(absprefix);
318 	free(basestr);
319 	free(uuidstr);
320 	return err;
321 }
322 
323 static const struct got_error *
324 open_worktree(struct got_worktree **worktree, const char *path)
325 {
326 	const struct got_error *err = NULL;
327 	char *path_got;
328 	char *formatstr = NULL;
329 	char *uuidstr = NULL;
330 	char *path_lock = NULL;
331 	char *base_commit_id_str = NULL;
332 	int version, fd = -1;
333 	const char *errstr;
334 	struct got_repository *repo = NULL;
335 	uint32_t uuid_status;
336 
337 	*worktree = NULL;
338 
339 	if (asprintf(&path_got, "%s/%s", path, GOT_WORKTREE_GOT_DIR) == -1) {
340 		err = got_error_from_errno("asprintf");
341 		path_got = NULL;
342 		goto done;
343 	}
344 
345 	if (asprintf(&path_lock, "%s/%s", path_got, GOT_WORKTREE_LOCK) == -1) {
346 		err = got_error_from_errno("asprintf");
347 		path_lock = NULL;
348 		goto done;
349 	}
350 
351 	fd = open(path_lock, O_RDWR | O_EXLOCK | O_NONBLOCK);
352 	if (fd == -1) {
353 		err = (errno == EWOULDBLOCK ? got_error(GOT_ERR_WORKTREE_BUSY)
354 		    : got_error_from_errno2("open", path_lock));
355 		goto done;
356 	}
357 
358 	err = read_meta_file(&formatstr, path_got, GOT_WORKTREE_FORMAT);
359 	if (err)
360 		goto done;
361 
362 	version = strtonum(formatstr, 1, INT_MAX, &errstr);
363 	if (errstr) {
364 		err = got_error_msg(GOT_ERR_WORKTREE_META,
365 		    "could not parse work tree format version number");
366 		goto done;
367 	}
368 	if (version != GOT_WORKTREE_FORMAT_VERSION) {
369 		err = got_error(GOT_ERR_WORKTREE_VERS);
370 		goto done;
371 	}
372 
373 	*worktree = calloc(1, sizeof(**worktree));
374 	if (*worktree == NULL) {
375 		err = got_error_from_errno("calloc");
376 		goto done;
377 	}
378 	(*worktree)->lockfd = -1;
379 
380 	(*worktree)->root_path = realpath(path, NULL);
381 	if ((*worktree)->root_path == NULL) {
382 		err = got_error_from_errno2("realpath", path);
383 		goto done;
384 	}
385 	err = read_meta_file(&(*worktree)->repo_path, path_got,
386 	    GOT_WORKTREE_REPOSITORY);
387 	if (err)
388 		goto done;
389 
390 	err = read_meta_file(&(*worktree)->path_prefix, path_got,
391 	    GOT_WORKTREE_PATH_PREFIX);
392 	if (err)
393 		goto done;
394 
395 	err = read_meta_file(&base_commit_id_str, path_got,
396 	    GOT_WORKTREE_BASE_COMMIT);
397 	if (err)
398 		goto done;
399 
400 	err = read_meta_file(&uuidstr, path_got, GOT_WORKTREE_UUID);
401 	if (err)
402 		goto done;
403 	uuid_from_string(uuidstr, &(*worktree)->uuid, &uuid_status);
404 	if (uuid_status != uuid_s_ok) {
405 		err = got_error_uuid(uuid_status, "uuid_from_string");
406 		goto done;
407 	}
408 
409 	err = got_repo_open(&repo, (*worktree)->repo_path, NULL);
410 	if (err)
411 		goto done;
412 
413 	err = got_object_resolve_id_str(&(*worktree)->base_commit_id, repo,
414 	    base_commit_id_str);
415 	if (err)
416 		goto done;
417 
418 	err = read_meta_file(&(*worktree)->head_ref_name, path_got,
419 	    GOT_WORKTREE_HEAD_REF);
420 	if (err)
421 		goto done;
422 
423 	if (asprintf(&(*worktree)->gotconfig_path, "%s/%s/%s",
424 	    (*worktree)->root_path,
425 	    GOT_WORKTREE_GOT_DIR, GOT_GOTCONFIG_FILENAME) == -1) {
426 		err = got_error_from_errno("asprintf");
427 		goto done;
428 	}
429 
430 	err = got_gotconfig_read(&(*worktree)->gotconfig,
431 	    (*worktree)->gotconfig_path);
432 done:
433 	if (repo)
434 		got_repo_close(repo);
435 	free(path_got);
436 	free(path_lock);
437 	free(base_commit_id_str);
438 	free(uuidstr);
439 	free(formatstr);
440 	if (err) {
441 		if (fd != -1)
442 			close(fd);
443 		if (*worktree != NULL)
444 			got_worktree_close(*worktree);
445 		*worktree = NULL;
446 	} else
447 		(*worktree)->lockfd = fd;
448 
449 	return err;
450 }
451 
452 const struct got_error *
453 got_worktree_open(struct got_worktree **worktree, const char *path)
454 {
455 	const struct got_error *err = NULL;
456 
457 	do {
458 		err = open_worktree(worktree, path);
459 		if (err && !(err->code == GOT_ERR_ERRNO && errno == ENOENT))
460 			return err;
461 		if (*worktree)
462 			return NULL;
463 		path = dirname(path);
464 		if (path == NULL)
465 			return got_error_from_errno2("dirname", path);
466 	} while (!((path[0] == '.' || path[0] == '/') && path[1] == '\0'));
467 
468 	return got_error(GOT_ERR_NOT_WORKTREE);
469 }
470 
471 const struct got_error *
472 got_worktree_close(struct got_worktree *worktree)
473 {
474 	const struct got_error *err = NULL;
475 	free(worktree->repo_path);
476 	free(worktree->path_prefix);
477 	free(worktree->base_commit_id);
478 	free(worktree->head_ref_name);
479 	if (worktree->lockfd != -1)
480 		if (close(worktree->lockfd) != 0)
481 			err = got_error_from_errno2("close",
482 			    got_worktree_get_root_path(worktree));
483 	free(worktree->root_path);
484 	free(worktree->gotconfig_path);
485 	got_gotconfig_free(worktree->gotconfig);
486 	free(worktree);
487 	return err;
488 }
489 
490 const char *
491 got_worktree_get_root_path(struct got_worktree *worktree)
492 {
493 	return worktree->root_path;
494 }
495 
496 const char *
497 got_worktree_get_repo_path(struct got_worktree *worktree)
498 {
499 	return worktree->repo_path;
500 }
501 const char *
502 got_worktree_get_path_prefix(struct got_worktree *worktree)
503 {
504 	return worktree->path_prefix;
505 }
506 
507 const struct got_error *
508 got_worktree_match_path_prefix(int *match, struct got_worktree *worktree,
509     const char *path_prefix)
510 {
511 	char *absprefix = NULL;
512 
513 	if (!got_path_is_absolute(path_prefix)) {
514 		if (asprintf(&absprefix, "/%s", path_prefix) == -1)
515 			return got_error_from_errno("asprintf");
516 	}
517 	*match = (strcmp(absprefix ? absprefix : path_prefix,
518 	    worktree->path_prefix) == 0);
519 	free(absprefix);
520 	return NULL;
521 }
522 
523 const char *
524 got_worktree_get_head_ref_name(struct got_worktree *worktree)
525 {
526 	return worktree->head_ref_name;
527 }
528 
529 const struct got_error *
530 got_worktree_set_head_ref(struct got_worktree *worktree,
531     struct got_reference *head_ref)
532 {
533 	const struct got_error *err = NULL;
534 	char *path_got = NULL, *head_ref_name = NULL;
535 
536 	if (asprintf(&path_got, "%s/%s", worktree->root_path,
537 	    GOT_WORKTREE_GOT_DIR) == -1) {
538 		err = got_error_from_errno("asprintf");
539 		path_got = NULL;
540 		goto done;
541 	}
542 
543 	head_ref_name = strdup(got_ref_get_name(head_ref));
544 	if (head_ref_name == NULL) {
545 		err = got_error_from_errno("strdup");
546 		goto done;
547 	}
548 
549 	err = write_head_ref(path_got, head_ref);
550 	if (err)
551 		goto done;
552 
553 	free(worktree->head_ref_name);
554 	worktree->head_ref_name = head_ref_name;
555 done:
556 	free(path_got);
557 	if (err)
558 		free(head_ref_name);
559 	return err;
560 }
561 
562 struct got_object_id *
563 got_worktree_get_base_commit_id(struct got_worktree *worktree)
564 {
565 	return worktree->base_commit_id;
566 }
567 
568 const struct got_error *
569 got_worktree_set_base_commit_id(struct got_worktree *worktree,
570     struct got_repository *repo, struct got_object_id *commit_id)
571 {
572 	const struct got_error *err;
573 	struct got_object *obj = NULL;
574 	char *id_str = NULL;
575 	char *path_got = NULL;
576 
577 	if (asprintf(&path_got, "%s/%s", worktree->root_path,
578 	    GOT_WORKTREE_GOT_DIR) == -1) {
579 		err = got_error_from_errno("asprintf");
580 		path_got = NULL;
581 		goto done;
582 	}
583 
584 	err = got_object_open(&obj, repo, commit_id);
585 	if (err)
586 		return err;
587 
588 	if (obj->type != GOT_OBJ_TYPE_COMMIT) {
589 		err = got_error(GOT_ERR_OBJ_TYPE);
590 		goto done;
591 	}
592 
593 	/* Record our base commit. */
594 	err = got_object_id_str(&id_str, commit_id);
595 	if (err)
596 		goto done;
597 	err = update_meta_file(path_got, GOT_WORKTREE_BASE_COMMIT, id_str);
598 	if (err)
599 		goto done;
600 
601 	free(worktree->base_commit_id);
602 	worktree->base_commit_id = got_object_id_dup(commit_id);
603 	if (worktree->base_commit_id == NULL) {
604 		err = got_error_from_errno("got_object_id_dup");
605 		goto done;
606 	}
607 done:
608 	if (obj)
609 		got_object_close(obj);
610 	free(id_str);
611 	free(path_got);
612 	return err;
613 }
614 
615 const struct got_gotconfig *
616 got_worktree_get_gotconfig(struct got_worktree *worktree)
617 {
618 	return worktree->gotconfig;
619 }
620 
621 static const struct got_error *
622 lock_worktree(struct got_worktree *worktree, int operation)
623 {
624 	if (flock(worktree->lockfd, operation | LOCK_NB) == -1)
625 		return (errno == EWOULDBLOCK ? got_error(GOT_ERR_WORKTREE_BUSY)
626 		    : got_error_from_errno2("flock",
627 		    got_worktree_get_root_path(worktree)));
628 	return NULL;
629 }
630 
631 static const struct got_error *
632 add_dir_on_disk(struct got_worktree *worktree, const char *path)
633 {
634 	const struct got_error *err = NULL;
635 	char *abspath;
636 
637 	if (asprintf(&abspath, "%s/%s", worktree->root_path, path) == -1)
638 		return got_error_from_errno("asprintf");
639 
640 	err = got_path_mkdir(abspath);
641 	if (err && err->code == GOT_ERR_ERRNO && errno == EEXIST) {
642 		struct stat sb;
643 		err = NULL;
644 		if (lstat(abspath, &sb) == -1) {
645 			err = got_error_from_errno2("lstat", abspath);
646 		} else if (!S_ISDIR(sb.st_mode)) {
647 			/* TODO directory is obstructed; do something */
648 			err = got_error_path(abspath, GOT_ERR_FILE_OBSTRUCTED);
649 		}
650 	}
651 	free(abspath);
652 	return err;
653 }
654 
655 static const struct got_error *
656 check_file_contents_equal(int *same, FILE *f1, FILE *f2)
657 {
658 	const struct got_error *err = NULL;
659 	uint8_t fbuf1[8192];
660 	uint8_t fbuf2[8192];
661 	size_t flen1 = 0, flen2 = 0;
662 
663 	*same = 1;
664 
665 	for (;;) {
666 		flen1 = fread(fbuf1, 1, sizeof(fbuf1), f1);
667 		if (flen1 == 0 && ferror(f1)) {
668 			err = got_error_from_errno("fread");
669 			break;
670 		}
671 		flen2 = fread(fbuf2, 1, sizeof(fbuf2), f2);
672 		if (flen2 == 0 && ferror(f2)) {
673 			err = got_error_from_errno("fread");
674 			break;
675 		}
676 		if (flen1 == 0) {
677 			if (flen2 != 0)
678 				*same = 0;
679 			break;
680 		} else if (flen2 == 0) {
681 			if (flen1 != 0)
682 				*same = 0;
683 			break;
684 		} else if (flen1 == flen2) {
685 			if (memcmp(fbuf1, fbuf2, flen2) != 0) {
686 				*same = 0;
687 				break;
688 			}
689 		} else {
690 			*same = 0;
691 			break;
692 		}
693 	}
694 
695 	return err;
696 }
697 
698 static const struct got_error *
699 check_files_equal(int *same, const char *f1_path, const char *f2_path)
700 {
701 	const struct got_error *err = NULL;
702 	struct stat sb;
703 	size_t size1, size2;
704 	FILE *f1 = NULL, *f2 = NULL;
705 
706 	*same = 1;
707 
708 	if (lstat(f1_path, &sb) != 0) {
709 		err = got_error_from_errno2("lstat", f1_path);
710 		goto done;
711 	}
712 	size1 = sb.st_size;
713 
714 	if (lstat(f2_path, &sb) != 0) {
715 		err = got_error_from_errno2("lstat", f2_path);
716 		goto done;
717 	}
718 	size2 = sb.st_size;
719 
720 	if (size1 != size2) {
721 		*same = 0;
722 		return NULL;
723 	}
724 
725 	f1 = fopen(f1_path, "r");
726 	if (f1 == NULL)
727 		return got_error_from_errno2("fopen", f1_path);
728 
729 	f2 = fopen(f2_path, "r");
730 	if (f2 == NULL) {
731 		err = got_error_from_errno2("fopen", f2_path);
732 		goto done;
733 	}
734 
735 	err = check_file_contents_equal(same, f1, f2);
736 done:
737 	if (f1 && fclose(f1) != 0 && err == NULL)
738 		err = got_error_from_errno("fclose");
739 	if (f2 && fclose(f2) != 0 && err == NULL)
740 		err = got_error_from_errno("fclose");
741 
742 	return err;
743 }
744 
745 /*
746  * Perform a 3-way merge where blob_orig acts as the common ancestor,
747  * the file at deriv_path acts as the first derived version, and the
748  * file on disk acts as the second derived version.
749  */
750 static const struct got_error *
751 merge_file(int *local_changes_subsumed, struct got_worktree *worktree,
752     struct got_blob_object *blob_orig, const char *ondisk_path,
753     const char *path, uint16_t st_mode, const char *deriv_path,
754     const char *label_orig, const char *label_deriv,
755     struct got_repository *repo,
756     got_worktree_checkout_cb progress_cb, void *progress_arg)
757 {
758 	const struct got_error *err = NULL;
759 	int merged_fd = -1;
760 	FILE *f_orig = NULL;
761 	char *blob_orig_path = NULL;
762 	char *merged_path = NULL, *base_path = NULL;
763 	int overlapcnt = 0;
764 	char *parent;
765 	char *symlink_path = NULL;
766 	FILE *symlinkf = NULL;
767 
768 	*local_changes_subsumed = 0;
769 
770 	parent = dirname(ondisk_path);
771 	if (parent == NULL)
772 		return got_error_from_errno2("dirname", ondisk_path);
773 
774 	if (asprintf(&base_path, "%s/got-merged", parent) == -1)
775 		return got_error_from_errno("asprintf");
776 
777 	err = got_opentemp_named_fd(&merged_path, &merged_fd, base_path);
778 	if (err)
779 		goto done;
780 
781 	free(base_path);
782 	if (asprintf(&base_path, "%s/got-merge-blob-orig", parent) == -1) {
783 		err = got_error_from_errno("asprintf");
784 		base_path = NULL;
785 		goto done;
786 	}
787 
788 	err = got_opentemp_named(&blob_orig_path, &f_orig, base_path);
789 	if (err)
790 		goto done;
791 	if (blob_orig) {
792 		err = got_object_blob_dump_to_file(NULL, NULL, NULL, f_orig,
793 		    blob_orig);
794 		if (err)
795 			goto done;
796 	} else {
797 		/*
798 		 * If the file has no blob, this is an "add vs add" conflict,
799 		 * and we simply use an empty ancestor file to make both files
800 		 * appear in the merged result in their entirety.
801 		 */
802 	}
803 
804 	/* 
805 	 * In order the run a 3-way merge with a symlink we copy the symlink's
806 	 * target path into a temporary file and use that file with diff3.
807 	 */
808 	if (S_ISLNK(st_mode)) {
809 		char target_path[PATH_MAX];
810 		ssize_t target_len;
811 		size_t n;
812 
813 		free(base_path);
814 		if (asprintf(&base_path, "%s/got-symlink-merge",
815 		    parent) == -1) {
816 			err = got_error_from_errno("asprintf");
817 			base_path = NULL;
818 			goto done;
819 		}
820 		err = got_opentemp_named(&symlink_path, &symlinkf, base_path);
821 		if (err)
822 			goto done;
823 		target_len = readlink(ondisk_path, target_path,
824 		    sizeof(target_path));
825 		if (target_len == -1) {
826 			err = got_error_from_errno2("readlink", ondisk_path);
827 			goto done;
828 		}
829 		n = fwrite(target_path, 1, target_len, symlinkf);
830 		if (n != target_len) {
831 			err = got_ferror(symlinkf, GOT_ERR_IO);
832 			goto done;
833 		}
834 		if (fflush(symlinkf) == EOF) {
835 			err = got_error_from_errno2("fflush", symlink_path);
836 			goto done;
837 		}
838 	}
839 
840 	err = got_merge_diff3(&overlapcnt, merged_fd, deriv_path,
841 	    blob_orig_path, symlink_path ? symlink_path : ondisk_path,
842 	    label_deriv, label_orig, NULL);
843 	if (err)
844 		goto done;
845 
846 	err = (*progress_cb)(progress_arg,
847 	    overlapcnt > 0 ? GOT_STATUS_CONFLICT : GOT_STATUS_MERGE, path);
848 	if (err)
849 		goto done;
850 
851 	if (fsync(merged_fd) != 0) {
852 		err = got_error_from_errno("fsync");
853 		goto done;
854 	}
855 
856 	/* Check if a clean merge has subsumed all local changes. */
857 	if (overlapcnt == 0) {
858 		err = check_files_equal(local_changes_subsumed, deriv_path,
859 		    merged_path);
860 		if (err)
861 			goto done;
862 	}
863 
864 	if (fchmod(merged_fd, st_mode) != 0) {
865 		err = got_error_from_errno2("fchmod", merged_path);
866 		goto done;
867 	}
868 
869 	if (rename(merged_path, ondisk_path) != 0) {
870 		err = got_error_from_errno3("rename", merged_path,
871 		    ondisk_path);
872 		goto done;
873 	}
874 done:
875 	if (err) {
876 		if (merged_path)
877 			unlink(merged_path);
878 	}
879 	if (symlink_path) {
880 		if (unlink(symlink_path) == -1 && err == NULL)
881 			err = got_error_from_errno2("unlink", symlink_path);
882 	}
883 	if (symlinkf && fclose(symlinkf) == EOF && err == NULL)
884 		err = got_error_from_errno2("fclose", symlink_path);
885 	free(symlink_path);
886 	if (merged_fd != -1 && close(merged_fd) != 0 && err == NULL)
887 		err = got_error_from_errno("close");
888 	if (f_orig && fclose(f_orig) != 0 && err == NULL)
889 		err = got_error_from_errno("fclose");
890 	free(merged_path);
891 	free(base_path);
892 	if (blob_orig_path) {
893 		unlink(blob_orig_path);
894 		free(blob_orig_path);
895 	}
896 	return err;
897 }
898 
899 static const struct got_error *
900 update_symlink(const char *ondisk_path, const char *target_path,
901     size_t target_len)
902 {
903 	/* This is not atomic but matches what 'ln -sf' does. */
904 	if (unlink(ondisk_path) == -1)
905 		return got_error_from_errno2("unlink", ondisk_path);
906 	if (symlink(target_path, ondisk_path) == -1)
907 		return got_error_from_errno3("symlink", target_path,
908 		    ondisk_path);
909 	return NULL;
910 }
911 
912 /*
913  * Overwrite a symlink (or a regular file in case there was a "bad" symlink)
914  * in the work tree with a file that contains conflict markers and the
915  * conflicting target paths of the original version, a "derived version"
916  * of a symlink from an incoming change, and a local version of the symlink.
917  *
918  * The original versions's target path can be NULL if it is not available,
919  * such as if both derived versions added a new symlink at the same path.
920  *
921  * The incoming derived symlink target is NULL in case the incoming change
922  * has deleted this symlink.
923  */
924 static const struct got_error *
925 install_symlink_conflict(const char *deriv_target,
926     struct got_object_id *deriv_base_commit_id, const char *orig_target,
927     const char *label_orig, const char *local_target, const char *ondisk_path)
928 {
929 	const struct got_error *err;
930 	char *id_str = NULL, *label_deriv = NULL, *path = NULL;
931 	FILE *f = NULL;
932 
933 	err = got_object_id_str(&id_str, deriv_base_commit_id);
934 	if (err)
935 		return got_error_from_errno("asprintf");
936 
937 	if (asprintf(&label_deriv, "%s: commit %s",
938 	    GOT_MERGE_LABEL_MERGED, id_str) == -1) {
939 		err = got_error_from_errno("asprintf");
940 		goto done;
941 	}
942 
943 	err = got_opentemp_named(&path, &f, "got-symlink-conflict");
944 	if (err)
945 		goto done;
946 
947 	if (fprintf(f, "%s %s\n%s\n%s%s%s%s%s\n%s\n%s\n",
948 	    GOT_DIFF_CONFLICT_MARKER_BEGIN, label_deriv,
949 	    deriv_target ? deriv_target : "(symlink was deleted)",
950 	    orig_target ? label_orig : "",
951 	    orig_target ? "\n" : "",
952 	    orig_target ? orig_target : "",
953 	    orig_target ? "\n" : "",
954 	    GOT_DIFF_CONFLICT_MARKER_SEP,
955 	    local_target, GOT_DIFF_CONFLICT_MARKER_END) < 0) {
956 		err = got_error_from_errno2("fprintf", path);
957 		goto done;
958 	}
959 
960 	if (unlink(ondisk_path) == -1) {
961 		err = got_error_from_errno2("unlink", ondisk_path);
962 		goto done;
963 	}
964 	if (rename(path, ondisk_path) == -1) {
965 		err = got_error_from_errno3("rename", path, ondisk_path);
966 		goto done;
967 	}
968 	if (chmod(ondisk_path, GOT_DEFAULT_FILE_MODE) == -1) {
969 		err = got_error_from_errno2("chmod", ondisk_path);
970 		goto done;
971 	}
972 done:
973 	if (f != NULL && fclose(f) == EOF && err == NULL)
974 		err = got_error_from_errno2("fclose", path);
975 	free(path);
976 	free(id_str);
977 	free(label_deriv);
978 	return err;
979 }
980 
981 /* forward declaration */
982 static const struct got_error *
983 merge_blob(int *, struct got_worktree *, struct got_blob_object *,
984     const char *, const char *, uint16_t, const char *,
985     struct got_blob_object *, struct got_object_id *,
986     struct got_repository *, got_worktree_checkout_cb, void *);
987 
988 /*
989  * Merge a symlink into the work tree, where blob_orig acts as the common
990  * ancestor, deriv_target is the link target of the first derived version,
991  * and the symlink on disk acts as the second derived version.
992  * Assume that contents of both blobs represent symlinks.
993  */
994 static const struct got_error *
995 merge_symlink(struct got_worktree *worktree,
996     struct got_blob_object *blob_orig, const char *ondisk_path,
997     const char *path, const char *label_orig, const char *deriv_target,
998     struct got_object_id *deriv_base_commit_id, struct got_repository *repo,
999     got_worktree_checkout_cb progress_cb, void *progress_arg)
1000 {
1001 	const struct got_error *err = NULL;
1002 	char *ancestor_target = NULL;
1003 	struct stat sb;
1004 	ssize_t ondisk_len, deriv_len;
1005 	char ondisk_target[PATH_MAX];
1006 	int have_local_change = 0;
1007 	int have_incoming_change = 0;
1008 
1009 	if (lstat(ondisk_path, &sb) == -1)
1010 		return got_error_from_errno2("lstat", ondisk_path);
1011 
1012 	ondisk_len = readlink(ondisk_path, ondisk_target,
1013 	    sizeof(ondisk_target));
1014 	if (ondisk_len == -1) {
1015 		err = got_error_from_errno2("readlink",
1016 		    ondisk_path);
1017 		goto done;
1018 	}
1019 	ondisk_target[ondisk_len] = '\0';
1020 
1021 	if (blob_orig) {
1022 		err = got_object_blob_read_to_str(&ancestor_target, blob_orig);
1023 		if (err)
1024 			goto done;
1025 	}
1026 
1027 	if (ancestor_target == NULL ||
1028 	    (ondisk_len != strlen(ancestor_target) ||
1029 	    memcmp(ondisk_target, ancestor_target, ondisk_len) != 0))
1030 		have_local_change = 1;
1031 
1032 	deriv_len = strlen(deriv_target);
1033 	if (ancestor_target == NULL ||
1034 	    (deriv_len != strlen(ancestor_target) ||
1035 	    memcmp(deriv_target, ancestor_target, deriv_len) != 0))
1036 		have_incoming_change = 1;
1037 
1038 	if (!have_local_change && !have_incoming_change) {
1039 		if (ancestor_target) {
1040 			/* Both sides made the same change. */
1041 			err = (*progress_cb)(progress_arg, GOT_STATUS_MERGE,
1042 			    path);
1043 		} else if (deriv_len == ondisk_len &&
1044 		    memcmp(ondisk_target, deriv_target, deriv_len) == 0) {
1045 			/* Both sides added the same symlink. */
1046 			err = (*progress_cb)(progress_arg, GOT_STATUS_MERGE,
1047 			    path);
1048 		} else {
1049 			/* Both sides added symlinks which don't match. */
1050 			err = install_symlink_conflict(deriv_target,
1051 			    deriv_base_commit_id, ancestor_target,
1052 			    label_orig, ondisk_target, ondisk_path);
1053 			if (err)
1054 				goto done;
1055 			err = (*progress_cb)(progress_arg, GOT_STATUS_CONFLICT,
1056 			    path);
1057 		}
1058 	} else if (!have_local_change && have_incoming_change) {
1059 		/* Apply the incoming change. */
1060 		err = update_symlink(ondisk_path, deriv_target,
1061 		    strlen(deriv_target));
1062 		if (err)
1063 			goto done;
1064 		err = (*progress_cb)(progress_arg, GOT_STATUS_MERGE, path);
1065 	} else if (have_local_change && have_incoming_change) {
1066 		if (deriv_len == ondisk_len &&
1067 		    memcmp(deriv_target, ondisk_target, deriv_len) == 0) {
1068 			/* Both sides made the same change. */
1069 			err = (*progress_cb)(progress_arg, GOT_STATUS_MERGE,
1070 			    path);
1071 		} else {
1072 			err = install_symlink_conflict(deriv_target,
1073 			    deriv_base_commit_id, ancestor_target, label_orig,
1074 			    ondisk_target, ondisk_path);
1075 			if (err)
1076 				goto done;
1077 			err = (*progress_cb)(progress_arg, GOT_STATUS_CONFLICT,
1078 			    path);
1079 		}
1080 	}
1081 
1082 done:
1083 	free(ancestor_target);
1084 	return err;
1085 }
1086 
1087 /*
1088  * Perform a 3-way merge where blob_orig acts as the common ancestor,
1089  * blob_deriv acts as the first derived version, and the file on disk
1090  * acts as the second derived version.
1091  */
1092 static const struct got_error *
1093 merge_blob(int *local_changes_subsumed, struct got_worktree *worktree,
1094     struct got_blob_object *blob_orig, const char *ondisk_path,
1095     const char *path, uint16_t st_mode, const char *label_orig,
1096     struct got_blob_object *blob_deriv,
1097     struct got_object_id *deriv_base_commit_id, struct got_repository *repo,
1098     got_worktree_checkout_cb progress_cb, void *progress_arg)
1099 {
1100 	const struct got_error *err = NULL;
1101 	FILE *f_deriv = NULL;
1102 	char *blob_deriv_path = NULL, *base_path = NULL, *id_str = NULL;
1103 	char *label_deriv = NULL, *parent;
1104 
1105 	*local_changes_subsumed = 0;
1106 
1107 	parent = dirname(ondisk_path);
1108 	if (parent == NULL)
1109 		return got_error_from_errno2("dirname", ondisk_path);
1110 
1111 	free(base_path);
1112 	if (asprintf(&base_path, "%s/got-merge-blob-deriv", parent) == -1) {
1113 		err = got_error_from_errno("asprintf");
1114 		base_path = NULL;
1115 		goto done;
1116 	}
1117 
1118 	err = got_opentemp_named(&blob_deriv_path, &f_deriv, base_path);
1119 	if (err)
1120 		goto done;
1121 	err = got_object_blob_dump_to_file(NULL, NULL, NULL, f_deriv,
1122 	    blob_deriv);
1123 	if (err)
1124 		goto done;
1125 
1126 	err = got_object_id_str(&id_str, deriv_base_commit_id);
1127 	if (err)
1128 		goto done;
1129 	if (asprintf(&label_deriv, "%s: commit %s",
1130 	    GOT_MERGE_LABEL_MERGED, id_str) == -1) {
1131 		err = got_error_from_errno("asprintf");
1132 		goto done;
1133 	}
1134 
1135 	err = merge_file(local_changes_subsumed, worktree, blob_orig,
1136 	    ondisk_path, path, st_mode, blob_deriv_path, label_orig,
1137 	    label_deriv, repo, progress_cb, progress_arg);
1138 done:
1139 	if (f_deriv && fclose(f_deriv) != 0 && err == NULL)
1140 		err = got_error_from_errno("fclose");
1141 	free(base_path);
1142 	if (blob_deriv_path) {
1143 		unlink(blob_deriv_path);
1144 		free(blob_deriv_path);
1145 	}
1146 	free(id_str);
1147 	free(label_deriv);
1148 	return err;
1149 }
1150 
1151 static const struct got_error *
1152 create_fileindex_entry(struct got_fileindex_entry **new_iep,
1153     struct got_fileindex *fileindex, struct got_object_id *base_commit_id,
1154     const char *ondisk_path, const char *path, struct got_object_id *blob_id)
1155 {
1156 	const struct got_error *err = NULL;
1157 	struct got_fileindex_entry *new_ie;
1158 
1159 	*new_iep = NULL;
1160 
1161 	err = got_fileindex_entry_alloc(&new_ie, path);
1162 	if (err)
1163 		return err;
1164 
1165 	err = got_fileindex_entry_update(new_ie, ondisk_path,
1166 	    blob_id->sha1, base_commit_id->sha1, 1);
1167 	if (err)
1168 		goto done;
1169 
1170 	err = got_fileindex_entry_add(fileindex, new_ie);
1171 done:
1172 	if (err)
1173 		got_fileindex_entry_free(new_ie);
1174 	else
1175 		*new_iep = new_ie;
1176 	return err;
1177 }
1178 
1179 static mode_t
1180 get_ondisk_perms(int executable, mode_t st_mode)
1181 {
1182 	mode_t xbits = S_IXUSR;
1183 
1184 	if (executable) {
1185 		/* Map read bits to execute bits. */
1186 		if (st_mode & S_IRGRP)
1187 			xbits |= S_IXGRP;
1188 		if (st_mode & S_IROTH)
1189 			xbits |= S_IXOTH;
1190 		return st_mode | xbits;
1191 	}
1192 
1193 	return (st_mode & ~(S_IXUSR | S_IXGRP | S_IXOTH));
1194 }
1195 
1196 /* forward declaration */
1197 static const struct got_error *
1198 install_blob(struct got_worktree *worktree, const char *ondisk_path,
1199     const char *path, mode_t te_mode, mode_t st_mode,
1200     struct got_blob_object *blob, int restoring_missing_file,
1201     int reverting_versioned_file, int installing_bad_symlink,
1202     int path_is_unversioned, struct got_repository *repo,
1203     got_worktree_checkout_cb progress_cb, void *progress_arg);
1204 
1205 /*
1206  * This function assumes that the provided symlink target points at a
1207  * safe location in the work tree!
1208  */
1209 static const struct got_error *
1210 replace_existing_symlink(const char *ondisk_path, const char *target_path,
1211     size_t target_len)
1212 {
1213 	const struct got_error *err = NULL;
1214 	ssize_t elen;
1215 	char etarget[PATH_MAX];
1216 	int fd;
1217 
1218 	/*
1219 	 * "Bad" symlinks (those pointing outside the work tree or into the
1220 	 * .got directory) are installed in the work tree as a regular file
1221 	 * which contains the bad symlink target path.
1222 	 * The new symlink target has already been checked for safety by our
1223 	 * caller. If we can successfully open a regular file then we simply
1224 	 * replace this file with a symlink below.
1225 	 */
1226 	fd = open(ondisk_path, O_RDWR | O_EXCL | O_NOFOLLOW);
1227 	if (fd == -1) {
1228 		if (errno != ELOOP)
1229 			return got_error_from_errno2("open", ondisk_path);
1230 
1231 		/* We are updating an existing on-disk symlink. */
1232 		elen = readlink(ondisk_path, etarget, sizeof(etarget));
1233 		if (elen == -1)
1234 			return got_error_from_errno2("readlink", ondisk_path);
1235 
1236 		if (elen == target_len &&
1237 		    memcmp(etarget, target_path, target_len) == 0)
1238 			return NULL; /* nothing to do */
1239 	}
1240 
1241 	err = update_symlink(ondisk_path, target_path, target_len);
1242 	if (fd != -1 && close(fd) == -1 && err == NULL)
1243 		err = got_error_from_errno2("close", ondisk_path);
1244 	return err;
1245 }
1246 
1247 static const struct got_error *
1248 is_bad_symlink_target(int *is_bad_symlink, const char *target_path,
1249     size_t target_len, const char *ondisk_path, const char *wtroot_path)
1250 {
1251 	const struct got_error *err = NULL;
1252 	char canonpath[PATH_MAX];
1253 	char *path_got = NULL;
1254 
1255 	*is_bad_symlink = 0;
1256 
1257 	if (target_len >= sizeof(canonpath)) {
1258 		*is_bad_symlink = 1;
1259 		return NULL;
1260 	}
1261 
1262 	/*
1263 	 * We do not use realpath(3) to resolve the symlink's target
1264 	 * path because we don't want to resolve symlinks recursively.
1265 	 * Instead we make the path absolute and then canonicalize it.
1266 	 * Relative symlink target lookup should begin at the directory
1267 	 * in which the blob object is being installed.
1268 	 */
1269 	if (!got_path_is_absolute(target_path)) {
1270 		char *abspath;
1271 		char *parent = dirname(ondisk_path);
1272 		if (parent == NULL)
1273 			return got_error_from_errno2("dirname", ondisk_path);
1274 		if (asprintf(&abspath, "%s/%s",  parent, target_path) == -1)
1275 			return got_error_from_errno("asprintf");
1276 		if (strlen(abspath) >= sizeof(canonpath)) {
1277 			err = got_error_path(abspath, GOT_ERR_BAD_PATH);
1278 			free(abspath);
1279 			return err;
1280 		}
1281 		err = got_canonpath(abspath, canonpath, sizeof(canonpath));
1282 		free(abspath);
1283 		if (err)
1284 			return err;
1285 	} else {
1286 		err = got_canonpath(target_path, canonpath, sizeof(canonpath));
1287 		if (err)
1288 			return err;
1289 	}
1290 
1291 	/* Only allow symlinks pointing at paths within the work tree. */
1292 	if (!got_path_is_child(canonpath, wtroot_path, strlen(wtroot_path))) {
1293 		*is_bad_symlink = 1;
1294 		return NULL;
1295 	}
1296 
1297 	/* Do not allow symlinks pointing into the .got directory. */
1298 	if (asprintf(&path_got, "%s/%s", wtroot_path,
1299 	    GOT_WORKTREE_GOT_DIR) == -1)
1300 		return got_error_from_errno("asprintf");
1301 	if (got_path_is_child(canonpath, path_got, strlen(path_got)))
1302 		*is_bad_symlink = 1;
1303 
1304 	free(path_got);
1305 	return NULL;
1306 }
1307 
1308 static const struct got_error *
1309 install_symlink(int *is_bad_symlink, struct got_worktree *worktree,
1310     const char *ondisk_path, const char *path, struct got_blob_object *blob,
1311     int restoring_missing_file, int reverting_versioned_file,
1312     int path_is_unversioned, struct got_repository *repo,
1313     got_worktree_checkout_cb progress_cb, void *progress_arg)
1314 {
1315 	const struct got_error *err = NULL;
1316 	char target_path[PATH_MAX];
1317 	size_t len, target_len = 0;
1318 	char *path_got = NULL;
1319 	const uint8_t *buf = got_object_blob_get_read_buf(blob);
1320 	size_t hdrlen = got_object_blob_get_hdrlen(blob);
1321 
1322 	*is_bad_symlink = 0;
1323 
1324 	/* 
1325 	 * Blob object content specifies the target path of the link.
1326 	 * If a symbolic link cannot be installed we instead create
1327 	 * a regular file which contains the link target path stored
1328 	 * in the blob object.
1329 	 */
1330 	do {
1331 		err = got_object_blob_read_block(&len, blob);
1332 		if (len + target_len >= sizeof(target_path)) {
1333 			/* Path too long; install as a regular file. */
1334 			*is_bad_symlink = 1;
1335 			got_object_blob_rewind(blob);
1336 			return install_blob(worktree, ondisk_path, path,
1337 			    GOT_DEFAULT_FILE_MODE, GOT_DEFAULT_FILE_MODE, blob,
1338 			    restoring_missing_file, reverting_versioned_file,
1339 			    1, path_is_unversioned, repo, progress_cb,
1340 			    progress_arg);
1341 		}
1342 		if (len > 0) {
1343 			/* Skip blob object header first time around. */
1344 			memcpy(target_path + target_len, buf + hdrlen,
1345 			    len - hdrlen);
1346 			target_len += len - hdrlen;
1347 			hdrlen = 0;
1348 		}
1349 	} while (len != 0);
1350 	target_path[target_len] = '\0';
1351 
1352 	err = is_bad_symlink_target(is_bad_symlink, target_path, target_len,
1353 	    ondisk_path, worktree->root_path);
1354 	if (err)
1355 		return err;
1356 
1357 	if (*is_bad_symlink) {
1358 		/* install as a regular file */
1359 		*is_bad_symlink = 1;
1360 		got_object_blob_rewind(blob);
1361 		err = install_blob(worktree, ondisk_path, path,
1362 		    GOT_DEFAULT_FILE_MODE, GOT_DEFAULT_FILE_MODE, blob,
1363 		    restoring_missing_file, reverting_versioned_file, 1,
1364 		    path_is_unversioned, repo, progress_cb, progress_arg);
1365 		goto done;
1366 	}
1367 
1368 	if (symlink(target_path, ondisk_path) == -1) {
1369 		if (errno == EEXIST) {
1370 			if (path_is_unversioned) {
1371 				err = (*progress_cb)(progress_arg,
1372 				    GOT_STATUS_UNVERSIONED, path);
1373 				goto done;
1374 			}
1375 			err = replace_existing_symlink(ondisk_path,
1376 			    target_path, target_len);
1377 			if (err)
1378 				goto done;
1379 			if (progress_cb) {
1380 				err = (*progress_cb)(progress_arg,
1381 				    reverting_versioned_file ?
1382 				    GOT_STATUS_REVERT : GOT_STATUS_UPDATE,
1383 				    path);
1384 			}
1385 			goto done; /* Nothing else to do. */
1386 		}
1387 
1388 		if (errno == ENOENT) {
1389 			char *parent = dirname(ondisk_path);
1390 			if (parent == NULL) {
1391 				err = got_error_from_errno2("dirname",
1392 				    ondisk_path);
1393 				goto done;
1394 			}
1395 			err = add_dir_on_disk(worktree, parent);
1396 			if (err)
1397 				goto done;
1398 			/*
1399 			 * Retry, and fall through to error handling
1400 			 * below if this second attempt fails.
1401 			 */
1402 			if (symlink(target_path, ondisk_path) != -1) {
1403 				err = NULL; /* success */
1404 				goto done;
1405 			}
1406 		}
1407 
1408 		/* Handle errors from first or second creation attempt. */
1409 		if (errno == ENAMETOOLONG) {
1410 			/* bad target path; install as a regular file */
1411 			*is_bad_symlink = 1;
1412 			got_object_blob_rewind(blob);
1413 			err = install_blob(worktree, ondisk_path, path,
1414 			    GOT_DEFAULT_FILE_MODE, GOT_DEFAULT_FILE_MODE, blob,
1415 			    restoring_missing_file, reverting_versioned_file, 1,
1416 			    path_is_unversioned, repo,
1417 			    progress_cb, progress_arg);
1418 		} else if (errno == ENOTDIR) {
1419 			err = got_error_path(ondisk_path,
1420 			    GOT_ERR_FILE_OBSTRUCTED);
1421 		} else {
1422 			err = got_error_from_errno3("symlink",
1423 			    target_path, ondisk_path);
1424 		}
1425 	} else if (progress_cb)
1426 		err = (*progress_cb)(progress_arg, reverting_versioned_file ?
1427 		    GOT_STATUS_REVERT : GOT_STATUS_ADD, path);
1428 done:
1429 	free(path_got);
1430 	return err;
1431 }
1432 
1433 static const struct got_error *
1434 install_blob(struct got_worktree *worktree, const char *ondisk_path,
1435     const char *path, mode_t te_mode, mode_t st_mode,
1436     struct got_blob_object *blob, int restoring_missing_file,
1437     int reverting_versioned_file, int installing_bad_symlink,
1438     int path_is_unversioned, struct got_repository *repo,
1439     got_worktree_checkout_cb progress_cb, void *progress_arg)
1440 {
1441 	const struct got_error *err = NULL;
1442 	int fd = -1;
1443 	size_t len, hdrlen;
1444 	int update = 0;
1445 	char *tmppath = NULL;
1446 
1447 	fd = open(ondisk_path, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW,
1448 	    GOT_DEFAULT_FILE_MODE);
1449 	if (fd == -1) {
1450 		if (errno == ENOENT) {
1451 			char *parent = dirname(path);
1452 			if (parent == NULL)
1453 				return got_error_from_errno2("dirname", path);
1454 			err = add_dir_on_disk(worktree, parent);
1455 			if (err)
1456 				return err;
1457 			fd = open(ondisk_path,
1458 			    O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW,
1459 			    GOT_DEFAULT_FILE_MODE);
1460 			if (fd == -1)
1461 				return got_error_from_errno2("open",
1462 				    ondisk_path);
1463 		} else if (errno == EEXIST) {
1464 			if (path_is_unversioned) {
1465 				err = (*progress_cb)(progress_arg,
1466 				    GOT_STATUS_UNVERSIONED, path);
1467 				goto done;
1468 			}
1469 			if (!S_ISREG(st_mode) && !installing_bad_symlink) {
1470 				/* TODO file is obstructed; do something */
1471 				err = got_error_path(ondisk_path,
1472 				    GOT_ERR_FILE_OBSTRUCTED);
1473 				goto done;
1474 			} else {
1475 				err = got_opentemp_named_fd(&tmppath, &fd,
1476 				    ondisk_path);
1477 				if (err)
1478 					goto done;
1479 				update = 1;
1480 			}
1481 		} else
1482 			return got_error_from_errno2("open", ondisk_path);
1483 	}
1484 
1485 	if (progress_cb) {
1486 		if (restoring_missing_file)
1487 			err = (*progress_cb)(progress_arg, GOT_STATUS_MISSING,
1488 			    path);
1489 		else if (reverting_versioned_file)
1490 			err = (*progress_cb)(progress_arg, GOT_STATUS_REVERT,
1491 			    path);
1492 		else
1493 			err = (*progress_cb)(progress_arg,
1494 			    update ? GOT_STATUS_UPDATE : GOT_STATUS_ADD, path);
1495 		if (err)
1496 			goto done;
1497 	}
1498 
1499 	hdrlen = got_object_blob_get_hdrlen(blob);
1500 	do {
1501 		const uint8_t *buf = got_object_blob_get_read_buf(blob);
1502 		err = got_object_blob_read_block(&len, blob);
1503 		if (err)
1504 			break;
1505 		if (len > 0) {
1506 			/* Skip blob object header first time around. */
1507 			ssize_t outlen = write(fd, buf + hdrlen, len - hdrlen);
1508 			if (outlen == -1) {
1509 				err = got_error_from_errno("write");
1510 				goto done;
1511 			} else if (outlen != len - hdrlen) {
1512 				err = got_error(GOT_ERR_IO);
1513 				goto done;
1514 			}
1515 			hdrlen = 0;
1516 		}
1517 	} while (len != 0);
1518 
1519 	if (fsync(fd) != 0) {
1520 		err = got_error_from_errno("fsync");
1521 		goto done;
1522 	}
1523 
1524 	if (update) {
1525 		if (rename(tmppath, ondisk_path) != 0) {
1526 			err = got_error_from_errno3("rename", tmppath,
1527 			    ondisk_path);
1528 			unlink(tmppath);
1529 			goto done;
1530 		}
1531 	}
1532 
1533 	if (chmod(ondisk_path,
1534 	    get_ondisk_perms(te_mode & S_IXUSR, st_mode)) == -1) {
1535 		err = got_error_from_errno2("chmod", ondisk_path);
1536 		goto done;
1537 	}
1538 
1539 done:
1540 	if (fd != -1 && close(fd) != 0 && err == NULL)
1541 		err = got_error_from_errno("close");
1542 	free(tmppath);
1543 	return err;
1544 }
1545 
1546 /* Upgrade STATUS_MODIFY to STATUS_CONFLICT if a conflict marker is found. */
1547 static const struct got_error *
1548 get_modified_file_content_status(unsigned char *status, FILE *f)
1549 {
1550 	const struct got_error *err = NULL;
1551 	const char *markers[3] = {
1552 		GOT_DIFF_CONFLICT_MARKER_BEGIN,
1553 		GOT_DIFF_CONFLICT_MARKER_SEP,
1554 		GOT_DIFF_CONFLICT_MARKER_END
1555 	};
1556 	int i = 0;
1557 	char *line;
1558 	size_t len;
1559 	const char delim[3] = {'\0', '\0', '\0'};
1560 
1561 	while (*status == GOT_STATUS_MODIFY) {
1562 		line = fparseln(f, &len, NULL, delim, 0);
1563 		if (line == NULL) {
1564 			if (feof(f))
1565 				break;
1566 			err = got_ferror(f, GOT_ERR_IO);
1567 			break;
1568 		}
1569 
1570 		if (strncmp(line, markers[i], strlen(markers[i])) == 0) {
1571 			if (strcmp(markers[i], GOT_DIFF_CONFLICT_MARKER_END)
1572 			    == 0)
1573 				*status = GOT_STATUS_CONFLICT;
1574 			else
1575 				i++;
1576 		}
1577 	}
1578 
1579 	return err;
1580 }
1581 
1582 static int
1583 xbit_differs(struct got_fileindex_entry *ie, uint16_t st_mode)
1584 {
1585 	mode_t ie_mode = got_fileindex_perms_to_st(ie);
1586 	return ((ie_mode & S_IXUSR) != (st_mode & S_IXUSR));
1587 }
1588 
1589 static int
1590 stat_info_differs(struct got_fileindex_entry *ie, struct stat *sb)
1591 {
1592 	return !(ie->ctime_sec == sb->st_ctim.tv_sec &&
1593 	    ie->ctime_nsec == sb->st_ctim.tv_nsec &&
1594 	    ie->mtime_sec == sb->st_mtim.tv_sec &&
1595 	    ie->mtime_nsec == sb->st_mtim.tv_nsec &&
1596 	    ie->size == (sb->st_size & 0xffffffff) &&
1597 	    !xbit_differs(ie, sb->st_mode));
1598 }
1599 
1600 static unsigned char
1601 get_staged_status(struct got_fileindex_entry *ie)
1602 {
1603 	switch (got_fileindex_entry_stage_get(ie)) {
1604 	case GOT_FILEIDX_STAGE_ADD:
1605 		return GOT_STATUS_ADD;
1606 	case GOT_FILEIDX_STAGE_DELETE:
1607 		return GOT_STATUS_DELETE;
1608 	case GOT_FILEIDX_STAGE_MODIFY:
1609 		return GOT_STATUS_MODIFY;
1610 	default:
1611 		return GOT_STATUS_NO_CHANGE;
1612 	}
1613 }
1614 
1615 static const struct got_error *
1616 get_symlink_modification_status(unsigned char *status,
1617     struct got_fileindex_entry *ie, const char *abspath,
1618     int dirfd, const char *de_name, struct got_blob_object *blob)
1619 {
1620 	const struct got_error *err = NULL;
1621 	char target_path[PATH_MAX];
1622 	char etarget[PATH_MAX];
1623 	ssize_t elen;
1624 	size_t len, target_len = 0;
1625 	const uint8_t *buf = got_object_blob_get_read_buf(blob);
1626 	size_t hdrlen = got_object_blob_get_hdrlen(blob);
1627 
1628 	*status = GOT_STATUS_NO_CHANGE;
1629 
1630 	/* Blob object content specifies the target path of the link. */
1631 	do {
1632 		err = got_object_blob_read_block(&len, blob);
1633 		if (err)
1634 			return err;
1635 		if (len + target_len >= sizeof(target_path)) {
1636 			/*
1637 			 * Should not happen. The blob contents were OK
1638 			 * when this symlink was installed.
1639 			 */
1640 			return got_error(GOT_ERR_NO_SPACE);
1641 		}
1642 		if (len > 0) {
1643 			/* Skip blob object header first time around. */
1644 			memcpy(target_path + target_len, buf + hdrlen,
1645 			    len - hdrlen);
1646 			target_len += len - hdrlen;
1647 			hdrlen = 0;
1648 		}
1649 	} while (len != 0);
1650 	target_path[target_len] = '\0';
1651 
1652 	if (dirfd != -1) {
1653 		elen = readlinkat(dirfd, de_name, etarget, sizeof(etarget));
1654 		if (elen == -1)
1655 			return got_error_from_errno2("readlinkat", abspath);
1656 	} else {
1657 		elen = readlink(abspath, etarget, sizeof(etarget));
1658 		if (elen == -1)
1659 			return got_error_from_errno2("readlink", abspath);
1660 	}
1661 
1662 	if (elen != target_len || memcmp(etarget, target_path, target_len) != 0)
1663 		*status = GOT_STATUS_MODIFY;
1664 
1665 	return NULL;
1666 }
1667 
1668 static const struct got_error *
1669 get_file_status(unsigned char *status, struct stat *sb,
1670     struct got_fileindex_entry *ie, const char *abspath,
1671     int dirfd, const char *de_name, struct got_repository *repo)
1672 {
1673 	const struct got_error *err = NULL;
1674 	struct got_object_id id;
1675 	size_t hdrlen;
1676 	int fd = -1;
1677 	FILE *f = NULL;
1678 	uint8_t fbuf[8192];
1679 	struct got_blob_object *blob = NULL;
1680 	size_t flen, blen;
1681 	unsigned char staged_status = get_staged_status(ie);
1682 
1683 	*status = GOT_STATUS_NO_CHANGE;
1684 
1685 	/*
1686 	 * Whenever the caller provides a directory descriptor and a
1687 	 * directory entry name for the file, use them! This prevents
1688 	 * race conditions if filesystem paths change beneath our feet.
1689 	 */
1690 	if (dirfd != -1) {
1691 		if (fstatat(dirfd, de_name, sb, AT_SYMLINK_NOFOLLOW) == -1) {
1692 			if (errno == ENOENT) {
1693 				if (got_fileindex_entry_has_file_on_disk(ie))
1694 					*status = GOT_STATUS_MISSING;
1695 				else
1696 					*status = GOT_STATUS_DELETE;
1697 				goto done;
1698 			}
1699 			err = got_error_from_errno2("fstatat", abspath);
1700 			goto done;
1701 		}
1702 	} else {
1703 		fd = open(abspath, O_RDONLY | O_NOFOLLOW);
1704 		if (fd == -1 && errno != ENOENT && errno != ELOOP)
1705 			return got_error_from_errno2("open", abspath);
1706 		else if (fd == -1 && errno == ELOOP) {
1707 			if (lstat(abspath, sb) == -1)
1708 				return got_error_from_errno2("lstat", abspath);
1709 		} else if (fd == -1 || fstat(fd, sb) == -1) {
1710 			if (errno == ENOENT) {
1711 				if (got_fileindex_entry_has_file_on_disk(ie))
1712 					*status = GOT_STATUS_MISSING;
1713 				else
1714 					*status = GOT_STATUS_DELETE;
1715 				goto done;
1716 			}
1717 			err = got_error_from_errno2("fstat", abspath);
1718 			goto done;
1719 		}
1720 	}
1721 
1722 	if (!S_ISREG(sb->st_mode) && !S_ISLNK(sb->st_mode)) {
1723 		*status = GOT_STATUS_OBSTRUCTED;
1724 		goto done;
1725 	}
1726 
1727 	if (!got_fileindex_entry_has_file_on_disk(ie)) {
1728 		*status = GOT_STATUS_DELETE;
1729 		goto done;
1730 	} else if (!got_fileindex_entry_has_blob(ie) &&
1731 	    staged_status != GOT_STATUS_ADD) {
1732 		*status = GOT_STATUS_ADD;
1733 		goto done;
1734 	}
1735 
1736 	if (!stat_info_differs(ie, sb))
1737 		goto done;
1738 
1739 	if (S_ISLNK(sb->st_mode) &&
1740 	    got_fileindex_entry_filetype_get(ie) != GOT_FILEIDX_MODE_SYMLINK) {
1741 		*status = GOT_STATUS_MODIFY;
1742 		goto done;
1743 	}
1744 
1745 	if (staged_status == GOT_STATUS_MODIFY ||
1746 	    staged_status == GOT_STATUS_ADD)
1747 		memcpy(id.sha1, ie->staged_blob_sha1, sizeof(id.sha1));
1748 	else
1749 		memcpy(id.sha1, ie->blob_sha1, sizeof(id.sha1));
1750 
1751 	err = got_object_open_as_blob(&blob, repo, &id, sizeof(fbuf));
1752 	if (err)
1753 		goto done;
1754 
1755 	if (S_ISLNK(sb->st_mode)) {
1756 		err = get_symlink_modification_status(status, ie,
1757 		    abspath, dirfd, de_name, blob);
1758 		goto done;
1759 	}
1760 
1761 	if (dirfd != -1) {
1762 		fd = openat(dirfd, de_name, O_RDONLY | O_NOFOLLOW);
1763 		if (fd == -1) {
1764 			err = got_error_from_errno2("openat", abspath);
1765 			goto done;
1766 		}
1767 	}
1768 
1769 	f = fdopen(fd, "r");
1770 	if (f == NULL) {
1771 		err = got_error_from_errno2("fdopen", abspath);
1772 		goto done;
1773 	}
1774 	fd = -1;
1775 	hdrlen = got_object_blob_get_hdrlen(blob);
1776 	for (;;) {
1777 		const uint8_t *bbuf = got_object_blob_get_read_buf(blob);
1778 		err = got_object_blob_read_block(&blen, blob);
1779 		if (err)
1780 			goto done;
1781 		/* Skip length of blob object header first time around. */
1782 		flen = fread(fbuf, 1, sizeof(fbuf) - hdrlen, f);
1783 		if (flen == 0 && ferror(f)) {
1784 			err = got_error_from_errno("fread");
1785 			goto done;
1786 		}
1787 		if (blen == 0) {
1788 			if (flen != 0)
1789 				*status = GOT_STATUS_MODIFY;
1790 			break;
1791 		} else if (flen == 0) {
1792 			if (blen != 0)
1793 				*status = GOT_STATUS_MODIFY;
1794 			break;
1795 		} else if (blen - hdrlen == flen) {
1796 			/* Skip blob object header first time around. */
1797 			if (memcmp(bbuf + hdrlen, fbuf, flen) != 0) {
1798 				*status = GOT_STATUS_MODIFY;
1799 				break;
1800 			}
1801 		} else {
1802 			*status = GOT_STATUS_MODIFY;
1803 			break;
1804 		}
1805 		hdrlen = 0;
1806 	}
1807 
1808 	if (*status == GOT_STATUS_MODIFY) {
1809 		rewind(f);
1810 		err = get_modified_file_content_status(status, f);
1811 	} else if (xbit_differs(ie, sb->st_mode))
1812 		*status = GOT_STATUS_MODE_CHANGE;
1813 done:
1814 	if (blob)
1815 		got_object_blob_close(blob);
1816 	if (f != NULL && fclose(f) == EOF && err == NULL)
1817 		err = got_error_from_errno2("fclose", abspath);
1818 	if (fd != -1 && close(fd) == -1 && err == NULL)
1819 		err = got_error_from_errno2("close", abspath);
1820 	return err;
1821 }
1822 
1823 /*
1824  * Update timestamps in the file index if a file is unmodified and
1825  * we had to run a full content comparison to find out.
1826  */
1827 static const struct got_error *
1828 sync_timestamps(char *ondisk_path, unsigned char status,
1829     struct got_fileindex_entry *ie, struct stat *sb)
1830 {
1831 	if (status == GOT_STATUS_NO_CHANGE && stat_info_differs(ie, sb))
1832 		return got_fileindex_entry_update(ie, ondisk_path,
1833 		    ie->blob_sha1, ie->commit_sha1, 1);
1834 
1835 	return NULL;
1836 }
1837 
1838 static const struct got_error *
1839 update_blob(struct got_worktree *worktree,
1840     struct got_fileindex *fileindex, struct got_fileindex_entry *ie,
1841     struct got_tree_entry *te, const char *path,
1842     struct got_repository *repo, got_worktree_checkout_cb progress_cb,
1843     void *progress_arg)
1844 {
1845 	const struct got_error *err = NULL;
1846 	struct got_blob_object *blob = NULL;
1847 	char *ondisk_path;
1848 	unsigned char status = GOT_STATUS_NO_CHANGE;
1849 	struct stat sb;
1850 
1851 	if (asprintf(&ondisk_path, "%s/%s", worktree->root_path, path) == -1)
1852 		return got_error_from_errno("asprintf");
1853 
1854 	if (ie) {
1855 		if (get_staged_status(ie) != GOT_STATUS_NO_CHANGE) {
1856 			err = got_error_path(ie->path, GOT_ERR_FILE_STAGED);
1857 			goto done;
1858 		}
1859 		err = get_file_status(&status, &sb, ie, ondisk_path, -1, NULL,
1860 		    repo);
1861 		if (err)
1862 			goto done;
1863 		if (status == GOT_STATUS_MISSING || status == GOT_STATUS_DELETE)
1864 			sb.st_mode = got_fileindex_perms_to_st(ie);
1865 	} else {
1866 		sb.st_mode = GOT_DEFAULT_FILE_MODE;
1867 		status = GOT_STATUS_UNVERSIONED;
1868 	}
1869 
1870 	if (status == GOT_STATUS_OBSTRUCTED) {
1871 		err = (*progress_cb)(progress_arg, status, path);
1872 		goto done;
1873 	}
1874 	if (status == GOT_STATUS_CONFLICT) {
1875 		err = (*progress_cb)(progress_arg, GOT_STATUS_CANNOT_UPDATE,
1876 		    path);
1877 		goto done;
1878 	}
1879 
1880 	if (ie && status != GOT_STATUS_MISSING &&
1881 	    (te->mode & S_IXUSR) == (sb.st_mode & S_IXUSR)) {
1882 		if (got_fileindex_entry_has_commit(ie) &&
1883 		    memcmp(ie->commit_sha1, worktree->base_commit_id->sha1,
1884 		    SHA1_DIGEST_LENGTH) == 0) {
1885 			err = sync_timestamps(ondisk_path, status, ie, &sb);
1886 			if (err)
1887 				goto done;
1888 			err = (*progress_cb)(progress_arg, GOT_STATUS_EXISTS,
1889 			    path);
1890 			goto done;
1891 		}
1892 		if (got_fileindex_entry_has_blob(ie) &&
1893 		    memcmp(ie->blob_sha1, te->id.sha1,
1894 		    SHA1_DIGEST_LENGTH) == 0) {
1895 			err = sync_timestamps(ondisk_path, status, ie, &sb);
1896 			goto done;
1897 		}
1898 	}
1899 
1900 	err = got_object_open_as_blob(&blob, repo, &te->id, 8192);
1901 	if (err)
1902 		goto done;
1903 
1904 	if (status == GOT_STATUS_MODIFY || status == GOT_STATUS_ADD) {
1905 		int update_timestamps;
1906 		struct got_blob_object *blob2 = NULL;
1907 		char *label_orig = NULL;
1908 		if (got_fileindex_entry_has_blob(ie)) {
1909 			struct got_object_id id2;
1910 			memcpy(id2.sha1, ie->blob_sha1, SHA1_DIGEST_LENGTH);
1911 			err = got_object_open_as_blob(&blob2, repo, &id2, 8192);
1912 			if (err)
1913 				goto done;
1914 		}
1915 		if (got_fileindex_entry_has_commit(ie)) {
1916 			char id_str[SHA1_DIGEST_STRING_LENGTH];
1917 			if (got_sha1_digest_to_str(ie->commit_sha1, id_str,
1918 			    sizeof(id_str)) == NULL) {
1919 				err = got_error_path(id_str,
1920 				    GOT_ERR_BAD_OBJ_ID_STR);
1921 				goto done;
1922 			}
1923 			if (asprintf(&label_orig, "%s: commit %s",
1924 			    GOT_MERGE_LABEL_BASE, id_str) == -1) {
1925 				err = got_error_from_errno("asprintf");
1926 				goto done;
1927 			}
1928 		}
1929 		if (S_ISLNK(te->mode) && S_ISLNK(sb.st_mode)) {
1930 			char *link_target;
1931 			err = got_object_blob_read_to_str(&link_target, blob);
1932 			if (err)
1933 				goto done;
1934 			err = merge_symlink(worktree, blob2, ondisk_path, path,
1935 			    label_orig, link_target, worktree->base_commit_id,
1936 			    repo, progress_cb, progress_arg);
1937 			free(link_target);
1938 		} else {
1939 			err = merge_blob(&update_timestamps, worktree, blob2,
1940 			    ondisk_path, path, sb.st_mode, label_orig, blob,
1941 			    worktree->base_commit_id, repo,
1942 			    progress_cb, progress_arg);
1943 		}
1944 		free(label_orig);
1945 		if (blob2)
1946 			got_object_blob_close(blob2);
1947 		if (err)
1948 			goto done;
1949 		/*
1950 		 * Do not update timestamps of files with local changes.
1951 		 * Otherwise, a future status walk would treat them as
1952 		 * unmodified files again.
1953 		 */
1954 		err = got_fileindex_entry_update(ie, ondisk_path,
1955 		    blob->id.sha1, worktree->base_commit_id->sha1,
1956 		    update_timestamps);
1957 	} else if (status == GOT_STATUS_MODE_CHANGE) {
1958 		err = got_fileindex_entry_update(ie, ondisk_path,
1959 		    blob->id.sha1, worktree->base_commit_id->sha1, 0);
1960 	} else if (status == GOT_STATUS_DELETE) {
1961 		err = (*progress_cb)(progress_arg, GOT_STATUS_MERGE, path);
1962 		if (err)
1963 			goto done;
1964 		err = got_fileindex_entry_update(ie, ondisk_path,
1965 		    blob->id.sha1, worktree->base_commit_id->sha1, 0);
1966 		if (err)
1967 			goto done;
1968 	} else {
1969 		int is_bad_symlink = 0;
1970 		if (S_ISLNK(te->mode)) {
1971 			err = install_symlink(&is_bad_symlink, worktree,
1972 			    ondisk_path, path, blob,
1973 			    status == GOT_STATUS_MISSING, 0,
1974 			    status == GOT_STATUS_UNVERSIONED, repo,
1975 			    progress_cb, progress_arg);
1976 		} else {
1977 			err = install_blob(worktree, ondisk_path, path,
1978 			    te->mode, sb.st_mode, blob,
1979 			    status == GOT_STATUS_MISSING, 0, 0,
1980 			    status == GOT_STATUS_UNVERSIONED, repo,
1981 			    progress_cb, progress_arg);
1982 		}
1983 		if (err)
1984 			goto done;
1985 
1986 		if (ie) {
1987 			err = got_fileindex_entry_update(ie, ondisk_path,
1988 			    blob->id.sha1, worktree->base_commit_id->sha1, 1);
1989 		} else {
1990 			err = create_fileindex_entry(&ie, fileindex,
1991 			    worktree->base_commit_id, ondisk_path, path,
1992 			    &blob->id);
1993 		}
1994 		if (err)
1995 			goto done;
1996 
1997 		if (is_bad_symlink) {
1998 			got_fileindex_entry_filetype_set(ie,
1999 			    GOT_FILEIDX_MODE_BAD_SYMLINK);
2000 		}
2001 	}
2002 	got_object_blob_close(blob);
2003 done:
2004 	free(ondisk_path);
2005 	return err;
2006 }
2007 
2008 static const struct got_error *
2009 remove_ondisk_file(const char *root_path, const char *path)
2010 {
2011 	const struct got_error *err = NULL;
2012 	char *ondisk_path = NULL;
2013 
2014 	if (asprintf(&ondisk_path, "%s/%s", root_path, path) == -1)
2015 		return got_error_from_errno("asprintf");
2016 
2017 	if (unlink(ondisk_path) == -1) {
2018 		if (errno != ENOENT)
2019 			err = got_error_from_errno2("unlink", ondisk_path);
2020 	} else {
2021 		char *parent = dirname(ondisk_path);
2022 		while (parent && strcmp(parent, root_path) != 0) {
2023 			if (rmdir(parent) == -1) {
2024 				if (errno != ENOTEMPTY)
2025 					err = got_error_from_errno2("rmdir",
2026 					    parent);
2027 				break;
2028 			}
2029 			parent = dirname(parent);
2030 		}
2031 	}
2032 	free(ondisk_path);
2033 	return err;
2034 }
2035 
2036 static const struct got_error *
2037 delete_blob(struct got_worktree *worktree, struct got_fileindex *fileindex,
2038     struct got_fileindex_entry *ie, struct got_repository *repo,
2039     got_worktree_checkout_cb progress_cb, void *progress_arg)
2040 {
2041 	const struct got_error *err = NULL;
2042 	unsigned char status;
2043 	struct stat sb;
2044 	char *ondisk_path;
2045 
2046 	if (get_staged_status(ie) != GOT_STATUS_NO_CHANGE)
2047 		return got_error_path(ie->path, GOT_ERR_FILE_STAGED);
2048 
2049 	if (asprintf(&ondisk_path, "%s/%s", worktree->root_path, ie->path)
2050 	    == -1)
2051 		return got_error_from_errno("asprintf");
2052 
2053 	err = get_file_status(&status, &sb, ie, ondisk_path, -1, NULL, repo);
2054 	if (err)
2055 		goto done;
2056 
2057 	if (S_ISLNK(sb.st_mode) && status != GOT_STATUS_NO_CHANGE) {
2058 		char ondisk_target[PATH_MAX];
2059 		ssize_t ondisk_len = readlink(ondisk_path, ondisk_target,
2060 		    sizeof(ondisk_target));
2061 		if (ondisk_len == -1) {
2062 			err = got_error_from_errno2("readlink", ondisk_path);
2063 			goto done;
2064 		}
2065 		ondisk_target[ondisk_len] = '\0';
2066 		err = install_symlink_conflict(NULL, worktree->base_commit_id,
2067 		    NULL, NULL, /* XXX pass common ancestor info? */
2068 		    ondisk_target, ondisk_path);
2069 		if (err)
2070 			goto done;
2071 		err = (*progress_cb)(progress_arg, GOT_STATUS_CONFLICT,
2072 		    ie->path);
2073 		goto done;
2074 	}
2075 
2076 	if (status == GOT_STATUS_MODIFY || status == GOT_STATUS_CONFLICT ||
2077 	    status == GOT_STATUS_ADD) {
2078 		err = (*progress_cb)(progress_arg, GOT_STATUS_MERGE, ie->path);
2079 		if (err)
2080 			goto done;
2081 		/*
2082 		 * Preserve the working file and change the deleted blob's
2083 		 * entry into a schedule-add entry.
2084 		 */
2085 		err = got_fileindex_entry_update(ie, ondisk_path, NULL, NULL,
2086 		    0);
2087 	} else {
2088 		err = (*progress_cb)(progress_arg, GOT_STATUS_DELETE, ie->path);
2089 		if (err)
2090 			goto done;
2091 		if (status == GOT_STATUS_NO_CHANGE) {
2092 			err = remove_ondisk_file(worktree->root_path, ie->path);
2093 			if (err)
2094 				goto done;
2095 		}
2096 		got_fileindex_entry_remove(fileindex, ie);
2097 	}
2098 done:
2099 	free(ondisk_path);
2100 	return err;
2101 }
2102 
2103 struct diff_cb_arg {
2104     struct got_fileindex *fileindex;
2105     struct got_worktree *worktree;
2106     struct got_repository *repo;
2107     got_worktree_checkout_cb progress_cb;
2108     void *progress_arg;
2109     got_cancel_cb cancel_cb;
2110     void *cancel_arg;
2111 };
2112 
2113 static const struct got_error *
2114 diff_old_new(void *arg, struct got_fileindex_entry *ie,
2115     struct got_tree_entry *te, const char *parent_path)
2116 {
2117 	struct diff_cb_arg *a = arg;
2118 
2119 	if (a->cancel_cb && a->cancel_cb(a->cancel_arg))
2120 		return got_error(GOT_ERR_CANCELLED);
2121 
2122 	return update_blob(a->worktree, a->fileindex, ie, te,
2123 	    ie->path, a->repo, a->progress_cb, a->progress_arg);
2124 }
2125 
2126 static const struct got_error *
2127 diff_old(void *arg, struct got_fileindex_entry *ie, const char *parent_path)
2128 {
2129 	struct diff_cb_arg *a = arg;
2130 
2131 	if (a->cancel_cb && a->cancel_cb(a->cancel_arg))
2132 		return got_error(GOT_ERR_CANCELLED);
2133 
2134 	return delete_blob(a->worktree, a->fileindex, ie,
2135 	    a->repo, a->progress_cb, a->progress_arg);
2136 }
2137 
2138 static const struct got_error *
2139 diff_new(void *arg, struct got_tree_entry *te, const char *parent_path)
2140 {
2141 	struct diff_cb_arg *a = arg;
2142 	const struct got_error *err;
2143 	char *path;
2144 
2145 	if (a->cancel_cb && a->cancel_cb(a->cancel_arg))
2146 		return got_error(GOT_ERR_CANCELLED);
2147 
2148 	if (got_object_tree_entry_is_submodule(te))
2149 		return NULL;
2150 
2151 	if (asprintf(&path, "%s%s%s", parent_path,
2152 	    parent_path[0] ? "/" : "", te->name)
2153 	    == -1)
2154 		return got_error_from_errno("asprintf");
2155 
2156 	if (S_ISDIR(te->mode))
2157 		err = add_dir_on_disk(a->worktree, path);
2158 	else
2159 		err = update_blob(a->worktree, a->fileindex, NULL, te, path,
2160 		    a->repo, a->progress_cb, a->progress_arg);
2161 
2162 	free(path);
2163 	return err;
2164 }
2165 
2166 const struct got_error *
2167 got_worktree_get_uuid(char **uuidstr, struct got_worktree *worktree)
2168 {
2169 	uint32_t uuid_status;
2170 
2171 	uuid_to_string(&worktree->uuid, uuidstr, &uuid_status);
2172 	if (uuid_status != uuid_s_ok) {
2173 		*uuidstr = NULL;
2174 		return got_error_uuid(uuid_status, "uuid_to_string");
2175 	}
2176 
2177 	return NULL;
2178 }
2179 
2180 static const struct got_error *
2181 get_ref_name(char **refname, struct got_worktree *worktree, const char *prefix)
2182 {
2183 	const struct got_error *err = NULL;
2184 	char *uuidstr = NULL;
2185 
2186 	*refname = NULL;
2187 
2188 	err = got_worktree_get_uuid(&uuidstr, worktree);
2189 	if (err)
2190 		return err;
2191 
2192 	if (asprintf(refname, "%s-%s", prefix, uuidstr) == -1) {
2193 		err = got_error_from_errno("asprintf");
2194 		*refname = NULL;
2195 	}
2196 	free(uuidstr);
2197 	return err;
2198 }
2199 
2200 const struct got_error *
2201 got_worktree_get_base_ref_name(char **refname, struct got_worktree *worktree)
2202 {
2203 	return get_ref_name(refname, worktree, GOT_WORKTREE_BASE_REF_PREFIX);
2204 }
2205 
2206 static const struct got_error *
2207 get_rebase_tmp_ref_name(char **refname, struct got_worktree *worktree)
2208 {
2209 	return get_ref_name(refname, worktree,
2210 	    GOT_WORKTREE_REBASE_TMP_REF_PREFIX);
2211 }
2212 
2213 static const struct got_error *
2214 get_newbase_symref_name(char **refname, struct got_worktree *worktree)
2215 {
2216 	return get_ref_name(refname, worktree, GOT_WORKTREE_NEWBASE_REF_PREFIX);
2217 }
2218 
2219 static const struct got_error *
2220 get_rebase_branch_symref_name(char **refname, struct got_worktree *worktree)
2221 {
2222 	return get_ref_name(refname, worktree,
2223 	    GOT_WORKTREE_REBASE_BRANCH_REF_PREFIX);
2224 }
2225 
2226 static const struct got_error *
2227 get_rebase_commit_ref_name(char **refname, struct got_worktree *worktree)
2228 {
2229 	return get_ref_name(refname, worktree,
2230 	    GOT_WORKTREE_REBASE_COMMIT_REF_PREFIX);
2231 }
2232 
2233 static const struct got_error *
2234 get_histedit_tmp_ref_name(char **refname, struct got_worktree *worktree)
2235 {
2236 	return get_ref_name(refname, worktree,
2237 	    GOT_WORKTREE_HISTEDIT_TMP_REF_PREFIX);
2238 }
2239 
2240 static const struct got_error *
2241 get_histedit_branch_symref_name(char **refname, struct got_worktree *worktree)
2242 {
2243 	return get_ref_name(refname, worktree,
2244 	    GOT_WORKTREE_HISTEDIT_BRANCH_REF_PREFIX);
2245 }
2246 
2247 static const struct got_error *
2248 get_histedit_base_commit_ref_name(char **refname, struct got_worktree *worktree)
2249 {
2250 	return get_ref_name(refname, worktree,
2251 	    GOT_WORKTREE_HISTEDIT_BASE_COMMIT_REF_PREFIX);
2252 }
2253 
2254 static const struct got_error *
2255 get_histedit_commit_ref_name(char **refname, struct got_worktree *worktree)
2256 {
2257 	return get_ref_name(refname, worktree,
2258 	    GOT_WORKTREE_HISTEDIT_COMMIT_REF_PREFIX);
2259 }
2260 
2261 const struct got_error *
2262 got_worktree_get_histedit_script_path(char **path,
2263     struct got_worktree *worktree)
2264 {
2265 	if (asprintf(path, "%s/%s/%s", worktree->root_path,
2266 	    GOT_WORKTREE_GOT_DIR, GOT_WORKTREE_HISTEDIT_SCRIPT) == -1) {
2267 		*path = NULL;
2268 		return got_error_from_errno("asprintf");
2269 	}
2270 	return NULL;
2271 }
2272 
2273 /*
2274  * Prevent Git's garbage collector from deleting our base commit by
2275  * setting a reference to our base commit's ID.
2276  */
2277 static const struct got_error *
2278 ref_base_commit(struct got_worktree *worktree, struct got_repository *repo)
2279 {
2280 	const struct got_error *err = NULL;
2281 	struct got_reference *ref = NULL;
2282 	char *refname;
2283 
2284 	err = got_worktree_get_base_ref_name(&refname, worktree);
2285 	if (err)
2286 		return err;
2287 
2288 	err = got_ref_alloc(&ref, refname, worktree->base_commit_id);
2289 	if (err)
2290 		goto done;
2291 
2292 	err = got_ref_write(ref, repo);
2293 done:
2294 	free(refname);
2295 	if (ref)
2296 		got_ref_close(ref);
2297 	return err;
2298 }
2299 
2300 static const struct got_error *
2301 get_fileindex_path(char **fileindex_path, struct got_worktree *worktree)
2302 {
2303 	const struct got_error *err = NULL;
2304 
2305 	if (asprintf(fileindex_path, "%s/%s/%s", worktree->root_path,
2306 	    GOT_WORKTREE_GOT_DIR, GOT_WORKTREE_FILE_INDEX) == -1) {
2307 		err = got_error_from_errno("asprintf");
2308 		*fileindex_path = NULL;
2309 	}
2310 	return err;
2311 }
2312 
2313 
2314 static const struct got_error *
2315 open_fileindex(struct got_fileindex **fileindex, char **fileindex_path,
2316     struct got_worktree *worktree)
2317 {
2318 	const struct got_error *err = NULL;
2319 	FILE *index = NULL;
2320 
2321 	*fileindex_path = NULL;
2322 	*fileindex = got_fileindex_alloc();
2323 	if (*fileindex == NULL)
2324 		return got_error_from_errno("got_fileindex_alloc");
2325 
2326 	err = get_fileindex_path(fileindex_path, worktree);
2327 	if (err)
2328 		goto done;
2329 
2330 	index = fopen(*fileindex_path, "rb");
2331 	if (index == NULL) {
2332 		if (errno != ENOENT)
2333 			err = got_error_from_errno2("fopen", *fileindex_path);
2334 	} else {
2335 		err = got_fileindex_read(*fileindex, index);
2336 		if (fclose(index) != 0 && err == NULL)
2337 			err = got_error_from_errno("fclose");
2338 	}
2339 done:
2340 	if (err) {
2341 		free(*fileindex_path);
2342 		*fileindex_path = NULL;
2343 		got_fileindex_free(*fileindex);
2344 		*fileindex = NULL;
2345 	}
2346 	return err;
2347 }
2348 
2349 struct bump_base_commit_id_arg {
2350 	struct got_object_id *base_commit_id;
2351 	const char *path;
2352 	size_t path_len;
2353 	const char *entry_name;
2354 	got_worktree_checkout_cb progress_cb;
2355 	void *progress_arg;
2356 };
2357 
2358 /* Bump base commit ID of all files within an updated part of the work tree. */
2359 static const struct got_error *
2360 bump_base_commit_id(void *arg, struct got_fileindex_entry *ie)
2361 {
2362 	const struct got_error *err;
2363 	struct bump_base_commit_id_arg *a = arg;
2364 
2365 	if (a->entry_name) {
2366 		if (strcmp(ie->path, a->path) != 0)
2367 			return NULL;
2368 	} else if (!got_path_is_child(ie->path, a->path, a->path_len))
2369 		return NULL;
2370 
2371 	if (memcmp(ie->commit_sha1, a->base_commit_id->sha1,
2372 	    SHA1_DIGEST_LENGTH) == 0)
2373 		return NULL;
2374 
2375 	if (a->progress_cb) {
2376 		err = (*a->progress_cb)(a->progress_arg, GOT_STATUS_BUMP_BASE,
2377 		    ie->path);
2378 		if (err)
2379 			return err;
2380 	}
2381 	memcpy(ie->commit_sha1, a->base_commit_id->sha1, SHA1_DIGEST_LENGTH);
2382 	return NULL;
2383 }
2384 
2385 static const struct got_error *
2386 sync_fileindex(struct got_fileindex *fileindex, const char *fileindex_path)
2387 {
2388 	const struct got_error *err = NULL;
2389 	char *new_fileindex_path = NULL;
2390 	FILE *new_index = NULL;
2391 	struct timespec timeout;
2392 
2393 	err = got_opentemp_named(&new_fileindex_path, &new_index,
2394 	    fileindex_path);
2395 	if (err)
2396 		goto done;
2397 
2398 	err = got_fileindex_write(fileindex, new_index);
2399 	if (err)
2400 		goto done;
2401 
2402 	if (rename(new_fileindex_path, fileindex_path) != 0) {
2403 		err = got_error_from_errno3("rename", new_fileindex_path,
2404 		    fileindex_path);
2405 		unlink(new_fileindex_path);
2406 	}
2407 
2408 	/*
2409 	 * Sleep for a short amount of time to ensure that files modified after
2410 	 * this program exits have a different time stamp from the one which
2411 	 * was recorded in the file index.
2412 	 */
2413 	 timeout.tv_sec = 0;
2414 	 timeout.tv_nsec = 1;
2415 	 nanosleep(&timeout,  NULL);
2416 done:
2417 	if (new_index)
2418 		fclose(new_index);
2419 	free(new_fileindex_path);
2420 	return err;
2421 }
2422 
2423 static const struct got_error *
2424 find_tree_entry_for_checkout(int *entry_type, char **tree_relpath,
2425     struct got_object_id **tree_id, const char *wt_relpath,
2426     struct got_worktree *worktree, struct got_repository *repo)
2427 {
2428 	const struct got_error *err = NULL;
2429 	struct got_object_id *id = NULL;
2430 	char *in_repo_path = NULL;
2431 	int is_root_wt = got_path_is_root_dir(worktree->path_prefix);
2432 
2433 	*entry_type = GOT_OBJ_TYPE_ANY;
2434 	*tree_relpath = NULL;
2435 	*tree_id = NULL;
2436 
2437 	if (wt_relpath[0] == '\0') {
2438 		/* Check out all files within the work tree. */
2439 		*entry_type = GOT_OBJ_TYPE_TREE;
2440 		*tree_relpath = strdup("");
2441 		if (*tree_relpath == NULL) {
2442 			err = got_error_from_errno("strdup");
2443 			goto done;
2444 		}
2445 		err = got_object_id_by_path(tree_id, repo,
2446 		    worktree->base_commit_id, worktree->path_prefix);
2447 		if (err)
2448 			goto done;
2449 		return NULL;
2450 	}
2451 
2452 	/* Check out a subset of files in the work tree. */
2453 
2454 	if (asprintf(&in_repo_path, "%s%s%s", worktree->path_prefix,
2455 	    is_root_wt ? "" : "/", wt_relpath) == -1) {
2456 		err = got_error_from_errno("asprintf");
2457 		goto done;
2458 	}
2459 
2460 	err = got_object_id_by_path(&id, repo, worktree->base_commit_id,
2461 	    in_repo_path);
2462 	if (err)
2463 		goto done;
2464 
2465 	free(in_repo_path);
2466 	in_repo_path = NULL;
2467 
2468 	err = got_object_get_type(entry_type, repo, id);
2469 	if (err)
2470 		goto done;
2471 
2472 	if (*entry_type == GOT_OBJ_TYPE_BLOB) {
2473 		/* Check out a single file. */
2474 		if (strchr(wt_relpath, '/')  == NULL) {
2475 			/* Check out a single file in work tree's root dir. */
2476 			in_repo_path = strdup(worktree->path_prefix);
2477 			if (in_repo_path == NULL) {
2478 				err = got_error_from_errno("strdup");
2479 				goto done;
2480 			}
2481 			*tree_relpath = strdup("");
2482 			if (*tree_relpath == NULL) {
2483 				err = got_error_from_errno("strdup");
2484 				goto done;
2485 			}
2486 		} else {
2487 			/* Check out a single file in a subdirectory. */
2488 			err = got_path_dirname(tree_relpath, wt_relpath);
2489 			if (err)
2490 				return err;
2491 			if (asprintf(&in_repo_path, "%s%s%s",
2492 			    worktree->path_prefix, is_root_wt ? "" : "/",
2493 			    *tree_relpath) == -1) {
2494 				err = got_error_from_errno("asprintf");
2495 				goto done;
2496 			}
2497 		}
2498 		err = got_object_id_by_path(tree_id, repo,
2499 		    worktree->base_commit_id, in_repo_path);
2500 	} else {
2501 		/* Check out all files within a subdirectory. */
2502 		*tree_id = got_object_id_dup(id);
2503 		if (*tree_id == NULL) {
2504 			err = got_error_from_errno("got_object_id_dup");
2505 			goto done;
2506 		}
2507 		*tree_relpath = strdup(wt_relpath);
2508 		if (*tree_relpath == NULL) {
2509 			err = got_error_from_errno("strdup");
2510 			goto done;
2511 		}
2512 	}
2513 done:
2514 	free(id);
2515 	free(in_repo_path);
2516 	if (err) {
2517 		*entry_type = GOT_OBJ_TYPE_ANY;
2518 		free(*tree_relpath);
2519 		*tree_relpath = NULL;
2520 		free(*tree_id);
2521 		*tree_id = NULL;
2522 	}
2523 	return err;
2524 }
2525 
2526 static const struct got_error *
2527 checkout_files(struct got_worktree *worktree, struct got_fileindex *fileindex,
2528     const char *relpath, struct got_object_id *tree_id, const char *entry_name,
2529     struct got_repository *repo, got_worktree_checkout_cb progress_cb,
2530     void *progress_arg, got_cancel_cb cancel_cb, void *cancel_arg)
2531 {
2532 	const struct got_error *err = NULL;
2533 	struct got_commit_object *commit = NULL;
2534 	struct got_tree_object *tree = NULL;
2535 	struct got_fileindex_diff_tree_cb diff_cb;
2536 	struct diff_cb_arg arg;
2537 
2538 	err = ref_base_commit(worktree, repo);
2539 	if (err) {
2540 		if (!(err->code == GOT_ERR_ERRNO &&
2541 		    (errno == EACCES || errno == EROFS)))
2542 			goto done;
2543 		err = (*progress_cb)(progress_arg,
2544 		    GOT_STATUS_BASE_REF_ERR, worktree->root_path);
2545 		if (err)
2546 			return err;
2547 	}
2548 
2549 	err = got_object_open_as_commit(&commit, repo,
2550 	   worktree->base_commit_id);
2551 	if (err)
2552 		goto done;
2553 
2554 	err = got_object_open_as_tree(&tree, repo, tree_id);
2555 	if (err)
2556 		goto done;
2557 
2558 	if (entry_name &&
2559 	    got_object_tree_find_entry(tree, entry_name) == NULL) {
2560 		err = got_error_path(entry_name, GOT_ERR_NO_TREE_ENTRY);
2561 		goto done;
2562 	}
2563 
2564 	diff_cb.diff_old_new = diff_old_new;
2565 	diff_cb.diff_old = diff_old;
2566 	diff_cb.diff_new = diff_new;
2567 	arg.fileindex = fileindex;
2568 	arg.worktree = worktree;
2569 	arg.repo = repo;
2570 	arg.progress_cb = progress_cb;
2571 	arg.progress_arg = progress_arg;
2572 	arg.cancel_cb = cancel_cb;
2573 	arg.cancel_arg = cancel_arg;
2574 	err = got_fileindex_diff_tree(fileindex, tree, relpath,
2575 	    entry_name, repo, &diff_cb, &arg);
2576 done:
2577 	if (tree)
2578 		got_object_tree_close(tree);
2579 	if (commit)
2580 		got_object_commit_close(commit);
2581 	return err;
2582 }
2583 
2584 const struct got_error *
2585 got_worktree_checkout_files(struct got_worktree *worktree,
2586     struct got_pathlist_head *paths, struct got_repository *repo,
2587     got_worktree_checkout_cb progress_cb, void *progress_arg,
2588     got_cancel_cb cancel_cb, void *cancel_arg)
2589 {
2590 	const struct got_error *err = NULL, *sync_err, *unlockerr;
2591 	struct got_commit_object *commit = NULL;
2592 	struct got_tree_object *tree = NULL;
2593 	struct got_fileindex *fileindex = NULL;
2594 	char *fileindex_path = NULL;
2595 	struct got_pathlist_entry *pe;
2596 	struct tree_path_data {
2597 		SIMPLEQ_ENTRY(tree_path_data) entry;
2598 		struct got_object_id *tree_id;
2599 		int entry_type;
2600 		char *relpath;
2601 		char *entry_name;
2602 	} *tpd = NULL;
2603 	SIMPLEQ_HEAD(tree_paths, tree_path_data) tree_paths;
2604 
2605 	SIMPLEQ_INIT(&tree_paths);
2606 
2607 	err = lock_worktree(worktree, LOCK_EX);
2608 	if (err)
2609 		return err;
2610 
2611 	/* Map all specified paths to in-repository trees. */
2612 	TAILQ_FOREACH(pe, paths, entry) {
2613 		tpd = malloc(sizeof(*tpd));
2614 		if (tpd == NULL) {
2615 			err = got_error_from_errno("malloc");
2616 			goto done;
2617 		}
2618 
2619 		err = find_tree_entry_for_checkout(&tpd->entry_type,
2620 		    &tpd->relpath, &tpd->tree_id, pe->path, worktree, repo);
2621 		if (err) {
2622 			free(tpd);
2623 			goto done;
2624 		}
2625 
2626 		if (tpd->entry_type == GOT_OBJ_TYPE_BLOB) {
2627 			err = got_path_basename(&tpd->entry_name, pe->path);
2628 			if (err) {
2629 				free(tpd->relpath);
2630 				free(tpd->tree_id);
2631 				free(tpd);
2632 				goto done;
2633 			}
2634 		} else
2635 			tpd->entry_name = NULL;
2636 
2637 		SIMPLEQ_INSERT_TAIL(&tree_paths, tpd, entry);
2638 	}
2639 
2640 	/*
2641 	 * Read the file index.
2642 	 * Checking out files is supposed to be an idempotent operation.
2643 	 * If the on-disk file index is incomplete we will try to complete it.
2644 	 */
2645 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
2646 	if (err)
2647 		goto done;
2648 
2649 	tpd = SIMPLEQ_FIRST(&tree_paths);
2650 	TAILQ_FOREACH(pe, paths, entry) {
2651 		struct bump_base_commit_id_arg bbc_arg;
2652 
2653 		err = checkout_files(worktree, fileindex, tpd->relpath,
2654 		    tpd->tree_id, tpd->entry_name, repo,
2655 		    progress_cb, progress_arg, cancel_cb, cancel_arg);
2656 		if (err)
2657 			break;
2658 
2659 		bbc_arg.base_commit_id = worktree->base_commit_id;
2660 		bbc_arg.entry_name = tpd->entry_name;
2661 		bbc_arg.path = pe->path;
2662 		bbc_arg.path_len = pe->path_len;
2663 		bbc_arg.progress_cb = progress_cb;
2664 		bbc_arg.progress_arg = progress_arg;
2665 		err = got_fileindex_for_each_entry_safe(fileindex,
2666 		    bump_base_commit_id, &bbc_arg);
2667 		if (err)
2668 			break;
2669 
2670 		tpd = SIMPLEQ_NEXT(tpd, entry);
2671 	}
2672 	sync_err = sync_fileindex(fileindex, fileindex_path);
2673 	if (sync_err && err == NULL)
2674 		err = sync_err;
2675 done:
2676 	free(fileindex_path);
2677 	if (tree)
2678 		got_object_tree_close(tree);
2679 	if (commit)
2680 		got_object_commit_close(commit);
2681 	if (fileindex)
2682 		got_fileindex_free(fileindex);
2683 	while (!SIMPLEQ_EMPTY(&tree_paths)) {
2684 		tpd = SIMPLEQ_FIRST(&tree_paths);
2685 		SIMPLEQ_REMOVE_HEAD(&tree_paths, entry);
2686 		free(tpd->relpath);
2687 		free(tpd->tree_id);
2688 		free(tpd);
2689 	}
2690 	unlockerr = lock_worktree(worktree, LOCK_SH);
2691 	if (unlockerr && err == NULL)
2692 		err = unlockerr;
2693 	return err;
2694 }
2695 
2696 struct merge_file_cb_arg {
2697     struct got_worktree *worktree;
2698     struct got_fileindex *fileindex;
2699     got_worktree_checkout_cb progress_cb;
2700     void *progress_arg;
2701     got_cancel_cb cancel_cb;
2702     void *cancel_arg;
2703     const char *label_orig;
2704     struct got_object_id *commit_id2;
2705 };
2706 
2707 static const struct got_error *
2708 merge_file_cb(void *arg, struct got_blob_object *blob1,
2709     struct got_blob_object *blob2, struct got_object_id *id1,
2710     struct got_object_id *id2, const char *path1, const char *path2,
2711     mode_t mode1, mode_t mode2, struct got_repository *repo)
2712 {
2713 	static const struct got_error *err = NULL;
2714 	struct merge_file_cb_arg *a = arg;
2715 	struct got_fileindex_entry *ie;
2716 	char *ondisk_path = NULL;
2717 	struct stat sb;
2718 	unsigned char status;
2719 	int local_changes_subsumed;
2720 
2721 	if (blob1 && blob2) {
2722 		ie = got_fileindex_entry_get(a->fileindex, path2,
2723 		    strlen(path2));
2724 		if (ie == NULL)
2725 			return (*a->progress_cb)(a->progress_arg,
2726 			    GOT_STATUS_MISSING, path2);
2727 
2728 		if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path,
2729 		    path2) == -1)
2730 			return got_error_from_errno("asprintf");
2731 
2732 		err = get_file_status(&status, &sb, ie, ondisk_path, -1, NULL,
2733 		    repo);
2734 		if (err)
2735 			goto done;
2736 
2737 		if (status == GOT_STATUS_DELETE) {
2738 			err = (*a->progress_cb)(a->progress_arg,
2739 			    GOT_STATUS_MERGE, path2);
2740 			goto done;
2741 		}
2742 		if (status != GOT_STATUS_NO_CHANGE &&
2743 		    status != GOT_STATUS_MODIFY &&
2744 		    status != GOT_STATUS_CONFLICT &&
2745 		    status != GOT_STATUS_ADD) {
2746 			err = (*a->progress_cb)(a->progress_arg, status, path2);
2747 			goto done;
2748 		}
2749 
2750 		if (S_ISLNK(mode1) && S_ISLNK(mode2)) {
2751 			char *link_target2;
2752 			err = got_object_blob_read_to_str(&link_target2, blob2);
2753 			if (err)
2754 				goto done;
2755 			err = merge_symlink(a->worktree, blob1, ondisk_path,
2756 			    path2, a->label_orig, link_target2, a->commit_id2,
2757 			    repo, a->progress_cb, a->progress_arg);
2758 			free(link_target2);
2759 		} else {
2760 			err = merge_blob(&local_changes_subsumed, a->worktree,
2761 			    blob1, ondisk_path, path2, sb.st_mode,
2762 			    a->label_orig, blob2, a->commit_id2, repo,
2763 			    a->progress_cb, a->progress_arg);
2764 		}
2765 	} else if (blob1) {
2766 		ie = got_fileindex_entry_get(a->fileindex, path1,
2767 		    strlen(path1));
2768 		if (ie == NULL)
2769 			return (*a->progress_cb)(a->progress_arg,
2770 			    GOT_STATUS_MISSING, path1);
2771 
2772 		if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path,
2773 		    path1) == -1)
2774 			return got_error_from_errno("asprintf");
2775 
2776 		err = get_file_status(&status, &sb, ie, ondisk_path, -1, NULL,
2777 		    repo);
2778 		if (err)
2779 			goto done;
2780 
2781 		switch (status) {
2782 		case GOT_STATUS_NO_CHANGE:
2783 			err = (*a->progress_cb)(a->progress_arg,
2784 			    GOT_STATUS_DELETE, path1);
2785 			if (err)
2786 				goto done;
2787 			err = remove_ondisk_file(a->worktree->root_path, path1);
2788 			if (err)
2789 				goto done;
2790 			if (ie)
2791 				got_fileindex_entry_mark_deleted_from_disk(ie);
2792 			break;
2793 		case GOT_STATUS_DELETE:
2794 		case GOT_STATUS_MISSING:
2795 			err = (*a->progress_cb)(a->progress_arg,
2796 			    GOT_STATUS_DELETE, path1);
2797 			if (err)
2798 				goto done;
2799 			if (ie)
2800 				got_fileindex_entry_mark_deleted_from_disk(ie);
2801 			break;
2802 		case GOT_STATUS_ADD: {
2803 			struct got_object_id *id;
2804 			FILE *blob1_f;
2805 			/*
2806 			 * Delete the added file only if its content already
2807 			 * exists in the repository.
2808 			 */
2809 			err = got_object_blob_file_create(&id, &blob1_f, path1);
2810 			if (err)
2811 				goto done;
2812 			if (got_object_id_cmp(id, id1) == 0) {
2813 				err = (*a->progress_cb)(a->progress_arg,
2814 				    GOT_STATUS_DELETE, path1);
2815 				if (err)
2816 					goto done;
2817 				err = remove_ondisk_file(a->worktree->root_path,
2818 				    path1);
2819 				if (err)
2820 					goto done;
2821 				if (ie)
2822 					got_fileindex_entry_remove(a->fileindex,
2823 					    ie);
2824 			} else {
2825 				err = (*a->progress_cb)(a->progress_arg,
2826 				    GOT_STATUS_CANNOT_DELETE, path1);
2827 			}
2828 			if (fclose(blob1_f) == EOF && err == NULL)
2829 				err = got_error_from_errno("fclose");
2830 			free(id);
2831 			if (err)
2832 				goto done;
2833 			break;
2834 		}
2835 		case GOT_STATUS_MODIFY:
2836 		case GOT_STATUS_CONFLICT:
2837 			err = (*a->progress_cb)(a->progress_arg,
2838 			    GOT_STATUS_CANNOT_DELETE, path1);
2839 			if (err)
2840 				goto done;
2841 			break;
2842 		case GOT_STATUS_OBSTRUCTED:
2843 			err = (*a->progress_cb)(a->progress_arg, status, path1);
2844 			if (err)
2845 				goto done;
2846 			break;
2847 		default:
2848 			break;
2849 		}
2850 	} else if (blob2) {
2851 		if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path,
2852 		    path2) == -1)
2853 			return got_error_from_errno("asprintf");
2854 		ie = got_fileindex_entry_get(a->fileindex, path2,
2855 		    strlen(path2));
2856 		if (ie) {
2857 			err = get_file_status(&status, &sb, ie, ondisk_path,
2858 			    -1, NULL, repo);
2859 			if (err)
2860 				goto done;
2861 			if (status != GOT_STATUS_NO_CHANGE &&
2862 			    status != GOT_STATUS_MODIFY &&
2863 			    status != GOT_STATUS_CONFLICT &&
2864 			    status != GOT_STATUS_ADD) {
2865 				err = (*a->progress_cb)(a->progress_arg,
2866 				    status, path2);
2867 				goto done;
2868 			}
2869 			if (S_ISLNK(mode2) && S_ISLNK(sb.st_mode)) {
2870 				char *link_target2;
2871 				err = got_object_blob_read_to_str(&link_target2,
2872 				    blob2);
2873 				if (err)
2874 					goto done;
2875 				err = merge_symlink(a->worktree, NULL,
2876 				    ondisk_path, path2, a->label_orig,
2877 				    link_target2, a->commit_id2, repo,
2878 				    a->progress_cb, a->progress_arg);
2879 				free(link_target2);
2880 			} else if (S_ISREG(sb.st_mode)) {
2881 				err = merge_blob(&local_changes_subsumed,
2882 				    a->worktree, NULL, ondisk_path, path2,
2883 				    sb.st_mode, a->label_orig, blob2,
2884 				    a->commit_id2, repo, a->progress_cb,
2885 				    a->progress_arg);
2886 			} else {
2887 				err = got_error_path(ondisk_path,
2888 				    GOT_ERR_FILE_OBSTRUCTED);
2889 			}
2890 			if (err)
2891 				goto done;
2892 			if (status == GOT_STATUS_DELETE) {
2893 				err = got_fileindex_entry_update(ie,
2894 				    ondisk_path, blob2->id.sha1,
2895 				    a->worktree->base_commit_id->sha1, 0);
2896 				if (err)
2897 					goto done;
2898 			}
2899 		} else {
2900 			int is_bad_symlink = 0;
2901 			sb.st_mode = GOT_DEFAULT_FILE_MODE;
2902 			if (S_ISLNK(mode2)) {
2903 				err = install_symlink(&is_bad_symlink,
2904 				    a->worktree, ondisk_path, path2, blob2, 0,
2905 				    0, 1, repo, a->progress_cb, a->progress_arg);
2906 			} else {
2907 				err = install_blob(a->worktree, ondisk_path, path2,
2908 				    mode2, sb.st_mode, blob2, 0, 0, 0, 1, repo,
2909 				    a->progress_cb, a->progress_arg);
2910 			}
2911 			if (err)
2912 				goto done;
2913 			err = got_fileindex_entry_alloc(&ie, path2);
2914 			if (err)
2915 				goto done;
2916 			err = got_fileindex_entry_update(ie, ondisk_path,
2917 			    NULL, NULL, 1);
2918 			if (err) {
2919 				got_fileindex_entry_free(ie);
2920 				goto done;
2921 			}
2922 			err = got_fileindex_entry_add(a->fileindex, ie);
2923 			if (err) {
2924 				got_fileindex_entry_free(ie);
2925 				goto done;
2926 			}
2927 			if (is_bad_symlink) {
2928 				got_fileindex_entry_filetype_set(ie,
2929 				    GOT_FILEIDX_MODE_BAD_SYMLINK);
2930 			}
2931 		}
2932 	}
2933 done:
2934 	free(ondisk_path);
2935 	return err;
2936 }
2937 
2938 struct check_merge_ok_arg {
2939 	struct got_worktree *worktree;
2940 	struct got_repository *repo;
2941 };
2942 
2943 static const struct got_error *
2944 check_merge_ok(void *arg, struct got_fileindex_entry *ie)
2945 {
2946 	const struct got_error *err = NULL;
2947 	struct check_merge_ok_arg *a = arg;
2948 	unsigned char status;
2949 	struct stat sb;
2950 	char *ondisk_path;
2951 
2952 	/* Reject merges into a work tree with mixed base commits. */
2953 	if (memcmp(ie->commit_sha1, a->worktree->base_commit_id->sha1,
2954 	    SHA1_DIGEST_LENGTH))
2955 		return got_error(GOT_ERR_MIXED_COMMITS);
2956 
2957 	if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path, ie->path)
2958 	    == -1)
2959 		return got_error_from_errno("asprintf");
2960 
2961 	/* Reject merges into a work tree with conflicted files. */
2962 	err = get_file_status(&status, &sb, ie, ondisk_path, -1, NULL, a->repo);
2963 	if (err)
2964 		return err;
2965 	if (status == GOT_STATUS_CONFLICT)
2966 		return got_error(GOT_ERR_CONFLICTS);
2967 
2968 	return NULL;
2969 }
2970 
2971 static const struct got_error *
2972 merge_files(struct got_worktree *worktree, struct got_fileindex *fileindex,
2973     const char *fileindex_path, struct got_object_id *commit_id1,
2974     struct got_object_id *commit_id2, struct got_repository *repo,
2975     got_worktree_checkout_cb progress_cb, void *progress_arg,
2976     got_cancel_cb cancel_cb, void *cancel_arg)
2977 {
2978 	const struct got_error *err = NULL, *sync_err;
2979 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
2980 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
2981 	struct merge_file_cb_arg arg;
2982 	char *label_orig = NULL;
2983 
2984 	if (commit_id1) {
2985 		err = got_object_id_by_path(&tree_id1, repo, commit_id1,
2986 		    worktree->path_prefix);
2987 		if (err && err->code != GOT_ERR_NO_TREE_ENTRY)
2988 			goto done;
2989 	}
2990 	if (tree_id1) {
2991 		char *id_str;
2992 
2993 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
2994 		if (err)
2995 			goto done;
2996 
2997 		err = got_object_id_str(&id_str, commit_id1);
2998 		if (err)
2999 			goto done;
3000 
3001 		if (asprintf(&label_orig, "%s: commit %s",
3002 		    GOT_MERGE_LABEL_BASE, id_str) == -1) {
3003 			err = got_error_from_errno("asprintf");
3004 			free(id_str);
3005 			goto done;
3006 		}
3007 		free(id_str);
3008 	}
3009 
3010 	err = got_object_id_by_path(&tree_id2, repo, commit_id2,
3011 	    worktree->path_prefix);
3012 	if (err)
3013 		goto done;
3014 
3015 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
3016 	if (err)
3017 		goto done;
3018 
3019 	arg.worktree = worktree;
3020 	arg.fileindex = fileindex;
3021 	arg.progress_cb = progress_cb;
3022 	arg.progress_arg = progress_arg;
3023 	arg.cancel_cb = cancel_cb;
3024 	arg.cancel_arg = cancel_arg;
3025 	arg.label_orig = label_orig;
3026 	arg.commit_id2 = commit_id2;
3027 	err = got_diff_tree(tree1, tree2, "", "", repo, merge_file_cb, &arg, 1);
3028 	sync_err = sync_fileindex(fileindex, fileindex_path);
3029 	if (sync_err && err == NULL)
3030 		err = sync_err;
3031 done:
3032 	if (tree1)
3033 		got_object_tree_close(tree1);
3034 	if (tree2)
3035 		got_object_tree_close(tree2);
3036 	free(label_orig);
3037 	return err;
3038 }
3039 
3040 const struct got_error *
3041 got_worktree_merge_files(struct got_worktree *worktree,
3042     struct got_object_id *commit_id1, struct got_object_id *commit_id2,
3043     struct got_repository *repo, got_worktree_checkout_cb progress_cb,
3044     void *progress_arg, got_cancel_cb cancel_cb, void *cancel_arg)
3045 {
3046 	const struct got_error *err, *unlockerr;
3047 	char *fileindex_path = NULL;
3048 	struct got_fileindex *fileindex = NULL;
3049 	struct check_merge_ok_arg mok_arg;
3050 
3051 	err = lock_worktree(worktree, LOCK_EX);
3052 	if (err)
3053 		return err;
3054 
3055 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
3056 	if (err)
3057 		goto done;
3058 
3059 	mok_arg.worktree = worktree;
3060 	mok_arg.repo = repo;
3061 	err = got_fileindex_for_each_entry_safe(fileindex, check_merge_ok,
3062 	    &mok_arg);
3063 	if (err)
3064 		goto done;
3065 
3066 	err = merge_files(worktree, fileindex, fileindex_path, commit_id1,
3067 	    commit_id2, repo, progress_cb, progress_arg, cancel_cb, cancel_arg);
3068 done:
3069 	if (fileindex)
3070 		got_fileindex_free(fileindex);
3071 	free(fileindex_path);
3072 	unlockerr = lock_worktree(worktree, LOCK_SH);
3073 	if (unlockerr && err == NULL)
3074 		err = unlockerr;
3075 	return err;
3076 }
3077 
3078 struct diff_dir_cb_arg {
3079     struct got_fileindex *fileindex;
3080     struct got_worktree *worktree;
3081     const char *status_path;
3082     size_t status_path_len;
3083     struct got_repository *repo;
3084     got_worktree_status_cb status_cb;
3085     void *status_arg;
3086     got_cancel_cb cancel_cb;
3087     void *cancel_arg;
3088     /* A pathlist containing per-directory pathlists of ignore patterns. */
3089     struct got_pathlist_head ignores;
3090     int report_unchanged;
3091     int no_ignores;
3092 };
3093 
3094 static const struct got_error *
3095 report_file_status(struct got_fileindex_entry *ie, const char *abspath,
3096     int dirfd, const char *de_name,
3097     got_worktree_status_cb status_cb, void *status_arg,
3098     struct got_repository *repo, int report_unchanged)
3099 {
3100 	const struct got_error *err = NULL;
3101 	unsigned char status = GOT_STATUS_NO_CHANGE;
3102 	unsigned char staged_status = get_staged_status(ie);
3103 	struct stat sb;
3104 	struct got_object_id blob_id, commit_id, staged_blob_id;
3105 	struct got_object_id *blob_idp = NULL, *commit_idp = NULL;
3106 	struct got_object_id *staged_blob_idp = NULL;
3107 
3108 	err = get_file_status(&status, &sb, ie, abspath, dirfd, de_name, repo);
3109 	if (err)
3110 		return err;
3111 
3112 	if (status == GOT_STATUS_NO_CHANGE &&
3113 	    staged_status == GOT_STATUS_NO_CHANGE && !report_unchanged)
3114 		return NULL;
3115 
3116 	if (got_fileindex_entry_has_blob(ie)) {
3117 		memcpy(blob_id.sha1, ie->blob_sha1, SHA1_DIGEST_LENGTH);
3118 		blob_idp = &blob_id;
3119 	}
3120 	if (got_fileindex_entry_has_commit(ie)) {
3121 		memcpy(commit_id.sha1, ie->commit_sha1, SHA1_DIGEST_LENGTH);
3122 		commit_idp = &commit_id;
3123 	}
3124 	if (staged_status == GOT_STATUS_ADD ||
3125 	    staged_status == GOT_STATUS_MODIFY) {
3126 		memcpy(staged_blob_id.sha1, ie->staged_blob_sha1,
3127 		    SHA1_DIGEST_LENGTH);
3128 		staged_blob_idp = &staged_blob_id;
3129 	}
3130 
3131 	return (*status_cb)(status_arg, status, staged_status,
3132 	    ie->path, blob_idp, staged_blob_idp, commit_idp, dirfd, de_name);
3133 }
3134 
3135 static const struct got_error *
3136 status_old_new(void *arg, struct got_fileindex_entry *ie,
3137     struct dirent *de, const char *parent_path, int dirfd)
3138 {
3139 	const struct got_error *err = NULL;
3140 	struct diff_dir_cb_arg *a = arg;
3141 	char *abspath;
3142 
3143 	if (a->cancel_cb && a->cancel_cb(a->cancel_arg))
3144 		return got_error(GOT_ERR_CANCELLED);
3145 
3146 	if (got_path_cmp(parent_path, a->status_path,
3147 	    strlen(parent_path), a->status_path_len) != 0 &&
3148 	    !got_path_is_child(parent_path, a->status_path, a->status_path_len))
3149 		return NULL;
3150 
3151 	if (parent_path[0]) {
3152 		if (asprintf(&abspath, "%s/%s/%s", a->worktree->root_path,
3153 		    parent_path, de->d_name) == -1)
3154 			return got_error_from_errno("asprintf");
3155 	} else {
3156 		if (asprintf(&abspath, "%s/%s", a->worktree->root_path,
3157 		    de->d_name) == -1)
3158 			return got_error_from_errno("asprintf");
3159 	}
3160 
3161 	err = report_file_status(ie, abspath, dirfd, de->d_name,
3162 	    a->status_cb, a->status_arg, a->repo, a->report_unchanged);
3163 	free(abspath);
3164 	return err;
3165 }
3166 
3167 static const struct got_error *
3168 status_old(void *arg, struct got_fileindex_entry *ie, const char *parent_path)
3169 {
3170 	struct diff_dir_cb_arg *a = arg;
3171 	struct got_object_id blob_id, commit_id;
3172 	unsigned char status;
3173 
3174 	if (a->cancel_cb && a->cancel_cb(a->cancel_arg))
3175 		return got_error(GOT_ERR_CANCELLED);
3176 
3177 	if (!got_path_is_child(ie->path, a->status_path, a->status_path_len))
3178 		return NULL;
3179 
3180 	memcpy(blob_id.sha1, ie->blob_sha1, SHA1_DIGEST_LENGTH);
3181 	memcpy(commit_id.sha1, ie->commit_sha1, SHA1_DIGEST_LENGTH);
3182 	if (got_fileindex_entry_has_file_on_disk(ie))
3183 		status = GOT_STATUS_MISSING;
3184 	else
3185 		status = GOT_STATUS_DELETE;
3186 	return (*a->status_cb)(a->status_arg, status, get_staged_status(ie),
3187 	    ie->path, &blob_id, NULL, &commit_id, -1, NULL);
3188 }
3189 
3190 void
3191 free_ignorelist(struct got_pathlist_head *ignorelist)
3192 {
3193 	struct got_pathlist_entry *pe;
3194 
3195 	TAILQ_FOREACH(pe, ignorelist, entry)
3196 		free((char *)pe->path);
3197 	got_pathlist_free(ignorelist);
3198 }
3199 
3200 void
3201 free_ignores(struct got_pathlist_head *ignores)
3202 {
3203 	struct got_pathlist_entry *pe;
3204 
3205 	TAILQ_FOREACH(pe, ignores, entry) {
3206 		struct got_pathlist_head *ignorelist = pe->data;
3207 		free_ignorelist(ignorelist);
3208 		free((char *)pe->path);
3209 	}
3210 	got_pathlist_free(ignores);
3211 }
3212 
3213 static const struct got_error *
3214 read_ignores(struct got_pathlist_head *ignores, const char *path, FILE *f)
3215 {
3216 	const struct got_error *err = NULL;
3217 	struct got_pathlist_entry *pe = NULL;
3218 	struct got_pathlist_head *ignorelist;
3219 	char *line = NULL, *pattern, *dirpath = NULL;
3220 	size_t linesize = 0;
3221 	ssize_t linelen;
3222 
3223 	ignorelist = calloc(1, sizeof(*ignorelist));
3224 	if (ignorelist == NULL)
3225 		return got_error_from_errno("calloc");
3226 	TAILQ_INIT(ignorelist);
3227 
3228 	while ((linelen = getline(&line, &linesize, f)) != -1) {
3229 		if (linelen > 0 && line[linelen - 1] == '\n')
3230 			line[linelen - 1] = '\0';
3231 
3232 		/* Git's ignores may contain comments. */
3233 		if (line[0] == '#')
3234 			continue;
3235 
3236 		/* Git's negated patterns are not (yet?) supported. */
3237 		if (line[0] == '!')
3238 			continue;
3239 
3240 		if (asprintf(&pattern, "%s%s%s", path, path[0] ? "/" : "",
3241 		    line) == -1) {
3242 			err = got_error_from_errno("asprintf");
3243 			goto done;
3244 		}
3245 		err = got_pathlist_insert(NULL, ignorelist, pattern, NULL);
3246 		if (err)
3247 			goto done;
3248 	}
3249 	if (ferror(f)) {
3250 		err = got_error_from_errno("getline");
3251 		goto done;
3252 	}
3253 
3254 	dirpath = strdup(path);
3255 	if (dirpath == NULL) {
3256 		err = got_error_from_errno("strdup");
3257 		goto done;
3258 	}
3259 	err = got_pathlist_insert(&pe, ignores, dirpath, ignorelist);
3260 done:
3261 	free(line);
3262 	if (err || pe == NULL) {
3263 		free(dirpath);
3264 		free_ignorelist(ignorelist);
3265 	}
3266 	return err;
3267 }
3268 
3269 int
3270 match_ignores(struct got_pathlist_head *ignores, const char *path)
3271 {
3272 	struct got_pathlist_entry *pe;
3273 
3274 	/* Handle patterns which match in all directories. */
3275 	TAILQ_FOREACH(pe, ignores, entry) {
3276 		struct got_pathlist_head *ignorelist = pe->data;
3277 		struct got_pathlist_entry *pi;
3278 
3279 		TAILQ_FOREACH(pi, ignorelist, entry) {
3280 			const char *p, *pattern = pi->path;
3281 
3282 			if (strncmp(pattern, "**/", 3) != 0)
3283 				continue;
3284 			pattern += 3;
3285 			p = path;
3286 			while (*p) {
3287 				if (fnmatch(pattern, p,
3288 				    FNM_PATHNAME | FNM_LEADING_DIR)) {
3289 					/* Retry in next directory. */
3290 					while (*p && *p != '/')
3291 						p++;
3292 					while (*p == '/')
3293 						p++;
3294 					continue;
3295 				}
3296 				return 1;
3297 			}
3298 		}
3299 	}
3300 
3301 	/*
3302 	 * The ignores pathlist contains ignore lists from children before
3303 	 * parents, so we can find the most specific ignorelist by walking
3304 	 * ignores backwards.
3305 	 */
3306 	pe = TAILQ_LAST(ignores, got_pathlist_head);
3307 	while (pe) {
3308 		if (got_path_is_child(path, pe->path, pe->path_len)) {
3309 			struct got_pathlist_head *ignorelist = pe->data;
3310 			struct got_pathlist_entry *pi;
3311 			TAILQ_FOREACH(pi, ignorelist, entry) {
3312 				const char *pattern = pi->path;
3313 				int flags = FNM_LEADING_DIR;
3314 				if (strstr(pattern, "/**/") == NULL)
3315 					flags |= FNM_PATHNAME;
3316 				if (fnmatch(pattern, path, flags))
3317 					continue;
3318 				return 1;
3319 			}
3320 		}
3321 		pe = TAILQ_PREV(pe, got_pathlist_head, entry);
3322 	}
3323 
3324 	return 0;
3325 }
3326 
3327 static const struct got_error *
3328 add_ignores(struct got_pathlist_head *ignores, const char *root_path,
3329     const char *path, int dirfd, const char *ignores_filename)
3330 {
3331 	const struct got_error *err = NULL;
3332 	char *ignorespath;
3333 	int fd = -1;
3334 	FILE *ignoresfile = NULL;
3335 
3336 	if (asprintf(&ignorespath, "%s/%s%s%s", root_path, path,
3337 	    path[0] ? "/" : "", ignores_filename) == -1)
3338 		return got_error_from_errno("asprintf");
3339 
3340 	if (dirfd != -1) {
3341 		fd = openat(dirfd, ignores_filename, O_RDONLY | O_NOFOLLOW);
3342 		if (fd == -1) {
3343 			if (errno != ENOENT && errno != EACCES)
3344 				err = got_error_from_errno2("openat",
3345 				    ignorespath);
3346 		} else {
3347 			ignoresfile = fdopen(fd, "r");
3348 			if (ignoresfile == NULL) 
3349 				err = got_error_from_errno2("fdopen",
3350 				    ignorespath);
3351 			else {
3352 				fd = -1;
3353 				err = read_ignores(ignores, path, ignoresfile);
3354 			}
3355 		}
3356 	} else {
3357 		ignoresfile = fopen(ignorespath, "r");
3358 		if (ignoresfile == NULL) {
3359 			if (errno != ENOENT && errno != EACCES)
3360 				err = got_error_from_errno2("fopen",
3361 				    ignorespath);
3362 		} else
3363 			err = read_ignores(ignores, path, ignoresfile);
3364 	}
3365 
3366 	if (ignoresfile && fclose(ignoresfile) == EOF && err == NULL)
3367 		err = got_error_from_errno2("fclose", path);
3368 	if (fd != -1 && close(fd) == -1 && err == NULL)
3369 		err = got_error_from_errno2("close", path);
3370 	free(ignorespath);
3371 	return err;
3372 }
3373 
3374 static const struct got_error *
3375 status_new(void *arg, struct dirent *de, const char *parent_path, int dirfd)
3376 {
3377 	const struct got_error *err = NULL;
3378 	struct diff_dir_cb_arg *a = arg;
3379 	char *path = NULL;
3380 
3381 	if (a->cancel_cb && a->cancel_cb(a->cancel_arg))
3382 		return got_error(GOT_ERR_CANCELLED);
3383 
3384 	if (parent_path[0]) {
3385 		if (asprintf(&path, "%s/%s", parent_path, de->d_name) == -1)
3386 			return got_error_from_errno("asprintf");
3387 	} else {
3388 		path = de->d_name;
3389 	}
3390 
3391 	if (de->d_type != DT_DIR &&
3392 	    got_path_is_child(path, a->status_path, a->status_path_len)
3393 	    && !match_ignores(&a->ignores, path))
3394 		err = (*a->status_cb)(a->status_arg, GOT_STATUS_UNVERSIONED,
3395 		    GOT_STATUS_NO_CHANGE, path, NULL, NULL, NULL, -1, NULL);
3396 	if (parent_path[0])
3397 		free(path);
3398 	return err;
3399 }
3400 
3401 static const struct got_error *
3402 status_traverse(void *arg, const char *path, int dirfd)
3403 {
3404 	const struct got_error *err = NULL;
3405 	struct diff_dir_cb_arg *a = arg;
3406 
3407 	if (a->no_ignores)
3408 		return NULL;
3409 
3410 	err = add_ignores(&a->ignores, a->worktree->root_path,
3411 	    path, dirfd, ".cvsignore");
3412 	if (err)
3413 		return err;
3414 
3415 	err = add_ignores(&a->ignores, a->worktree->root_path, path,
3416 	    dirfd, ".gitignore");
3417 
3418 	return err;
3419 }
3420 
3421 static const struct got_error *
3422 report_single_file_status(const char *path, const char *ondisk_path,
3423 struct got_fileindex *fileindex, got_worktree_status_cb status_cb,
3424 void *status_arg, struct got_repository *repo, int report_unchanged)
3425 {
3426 	struct got_fileindex_entry *ie;
3427 	struct stat sb;
3428 
3429 	ie = got_fileindex_entry_get(fileindex, path, strlen(path));
3430 	if (ie)
3431 		return report_file_status(ie, ondisk_path, -1, NULL,
3432 		    status_cb, status_arg, repo, report_unchanged);
3433 
3434 	if (lstat(ondisk_path, &sb) == -1) {
3435 		if (errno != ENOENT)
3436 			return got_error_from_errno2("lstat", ondisk_path);
3437 		return (*status_cb)(status_arg, GOT_STATUS_NONEXISTENT,
3438 		    GOT_STATUS_NO_CHANGE, path, NULL, NULL, NULL, -1, NULL);
3439 		return NULL;
3440 	}
3441 
3442 	if (S_ISREG(sb.st_mode) || S_ISLNK(sb.st_mode))
3443 		return (*status_cb)(status_arg, GOT_STATUS_UNVERSIONED,
3444 		    GOT_STATUS_NO_CHANGE, path, NULL, NULL, NULL, -1, NULL);
3445 
3446 	return NULL;
3447 }
3448 
3449 static const struct got_error *
3450 add_ignores_from_parent_paths(struct got_pathlist_head *ignores,
3451     const char *root_path, const char *path)
3452 {
3453 	const struct got_error *err;
3454 	char *parent_path, *next_parent_path = NULL;
3455 
3456 	err = add_ignores(ignores, root_path, "", -1,
3457 	    ".cvsignore");
3458 	if (err)
3459 		return err;
3460 
3461 	err = add_ignores(ignores, root_path, "", -1,
3462 	    ".gitignore");
3463 	if (err)
3464 		return err;
3465 
3466 	err = got_path_dirname(&parent_path, path);
3467 	if (err) {
3468 		if (err->code == GOT_ERR_BAD_PATH)
3469 			return NULL; /* cannot traverse parent */
3470 		return err;
3471 	}
3472 	for (;;) {
3473 		err = add_ignores(ignores, root_path, parent_path, -1,
3474 		    ".cvsignore");
3475 		if (err)
3476 			break;
3477 		err = add_ignores(ignores, root_path, parent_path, -1,
3478 		    ".gitignore");
3479 		if (err)
3480 			break;
3481 		err = got_path_dirname(&next_parent_path, parent_path);
3482 		if (err) {
3483 			if (err->code == GOT_ERR_BAD_PATH)
3484 				err = NULL; /* traversed everything */
3485 			break;
3486 		}
3487 		free(parent_path);
3488 		parent_path = next_parent_path;
3489 		next_parent_path = NULL;
3490 	}
3491 
3492 	free(parent_path);
3493 	free(next_parent_path);
3494 	return err;
3495 }
3496 
3497 static const struct got_error *
3498 worktree_status(struct got_worktree *worktree, const char *path,
3499     struct got_fileindex *fileindex, struct got_repository *repo,
3500     got_worktree_status_cb status_cb, void *status_arg,
3501     got_cancel_cb cancel_cb, void *cancel_arg, int no_ignores,
3502     int report_unchanged)
3503 {
3504 	const struct got_error *err = NULL;
3505 	int fd = -1;
3506 	struct got_fileindex_diff_dir_cb fdiff_cb;
3507 	struct diff_dir_cb_arg arg;
3508 	char *ondisk_path = NULL;
3509 
3510 	TAILQ_INIT(&arg.ignores);
3511 
3512 	if (asprintf(&ondisk_path, "%s%s%s",
3513 	    worktree->root_path, path[0] ? "/" : "", path) == -1)
3514 		return got_error_from_errno("asprintf");
3515 
3516 	fd = open(ondisk_path, O_RDONLY | O_NOFOLLOW | O_DIRECTORY);
3517 	if (fd == -1) {
3518 		if (errno != ENOTDIR && errno != ENOENT && errno != EACCES &&
3519 		    errno != ELOOP)
3520 			err = got_error_from_errno2("open", ondisk_path);
3521 		else
3522 			err = report_single_file_status(path, ondisk_path,
3523 			    fileindex, status_cb, status_arg, repo,
3524 			    report_unchanged);
3525 	} else {
3526 		fdiff_cb.diff_old_new = status_old_new;
3527 		fdiff_cb.diff_old = status_old;
3528 		fdiff_cb.diff_new = status_new;
3529 		fdiff_cb.diff_traverse = status_traverse;
3530 		arg.fileindex = fileindex;
3531 		arg.worktree = worktree;
3532 		arg.status_path = path;
3533 		arg.status_path_len = strlen(path);
3534 		arg.repo = repo;
3535 		arg.status_cb = status_cb;
3536 		arg.status_arg = status_arg;
3537 		arg.cancel_cb = cancel_cb;
3538 		arg.cancel_arg = cancel_arg;
3539 		arg.report_unchanged = report_unchanged;
3540 		arg.no_ignores = no_ignores;
3541 		if (!no_ignores) {
3542 			err = add_ignores_from_parent_paths(&arg.ignores,
3543 			    worktree->root_path, path);
3544 			if (err)
3545 				goto done;
3546 		}
3547 		err = got_fileindex_diff_dir(fileindex, fd,
3548 		    worktree->root_path, path, repo, &fdiff_cb, &arg);
3549 	}
3550 done:
3551 	free_ignores(&arg.ignores);
3552 	if (fd != -1 && close(fd) != 0 && err == NULL)
3553 		err = got_error_from_errno("close");
3554 	free(ondisk_path);
3555 	return err;
3556 }
3557 
3558 const struct got_error *
3559 got_worktree_status(struct got_worktree *worktree,
3560     struct got_pathlist_head *paths, struct got_repository *repo,
3561     got_worktree_status_cb status_cb, void *status_arg,
3562     got_cancel_cb cancel_cb, void *cancel_arg)
3563 {
3564 	const struct got_error *err = NULL;
3565 	char *fileindex_path = NULL;
3566 	struct got_fileindex *fileindex = NULL;
3567 	struct got_pathlist_entry *pe;
3568 
3569 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
3570 	if (err)
3571 		return err;
3572 
3573 	TAILQ_FOREACH(pe, paths, entry) {
3574 		err = worktree_status(worktree, pe->path, fileindex, repo,
3575 			status_cb, status_arg, cancel_cb, cancel_arg, 0, 0);
3576 		if (err)
3577 			break;
3578 	}
3579 	free(fileindex_path);
3580 	got_fileindex_free(fileindex);
3581 	return err;
3582 }
3583 
3584 const struct got_error *
3585 got_worktree_resolve_path(char **wt_path, struct got_worktree *worktree,
3586     const char *arg)
3587 {
3588 	const struct got_error *err = NULL;
3589 	char *resolved = NULL, *cwd = NULL, *path = NULL;
3590 	size_t len;
3591 	struct stat sb;
3592 
3593 	*wt_path = NULL;
3594 
3595 	cwd = getcwd(NULL, 0);
3596 	if (cwd == NULL)
3597 		return got_error_from_errno("getcwd");
3598 
3599 	if (lstat(arg, &sb) == -1) {
3600 		if (errno != ENOENT) {
3601 			err = got_error_from_errno2("lstat", arg);
3602 			goto done;
3603 		}
3604 	}
3605 	if (S_ISLNK(sb.st_mode)) {
3606 		/*
3607 		 * We cannot use realpath(3) with symlinks since we want to
3608 		 * operate on the symlink itself.
3609 		 * But we can make the path absolute, assuming it is relative
3610 		 * to the current working directory, and then canonicalize it.
3611 		 */
3612 		char *abspath = NULL;
3613 		char canonpath[PATH_MAX];
3614 		if (!got_path_is_absolute(arg)) {
3615 			if (asprintf(&abspath, "%s/%s", cwd, arg) == -1) {
3616 				err = got_error_from_errno("asprintf");
3617 				goto done;
3618 			}
3619 
3620 		}
3621 		err = got_canonpath(abspath ? abspath : arg, canonpath,
3622 		    sizeof(canonpath));
3623 		if (err)
3624 			goto done;
3625 		resolved = strdup(canonpath);
3626 		if (resolved == NULL) {
3627 			err = got_error_from_errno("strdup");
3628 			goto done;
3629 		}
3630 	} else {
3631 		resolved = realpath(arg, NULL);
3632 		if (resolved == NULL) {
3633 			if (errno != ENOENT) {
3634 				err = got_error_from_errno2("realpath", arg);
3635 				goto done;
3636 			}
3637 			if (asprintf(&resolved, "%s/%s", cwd, arg) == -1) {
3638 				err = got_error_from_errno("asprintf");
3639 				goto done;
3640 			}
3641 		}
3642 	}
3643 
3644 	if (strncmp(got_worktree_get_root_path(worktree), resolved,
3645 	    strlen(got_worktree_get_root_path(worktree)))) {
3646 		err = got_error_path(resolved, GOT_ERR_BAD_PATH);
3647 		goto done;
3648 	}
3649 
3650 	if (strlen(resolved) > strlen(got_worktree_get_root_path(worktree))) {
3651 		err = got_path_skip_common_ancestor(&path,
3652 		    got_worktree_get_root_path(worktree), resolved);
3653 		if (err)
3654 			goto done;
3655 	} else {
3656 		path = strdup("");
3657 		if (path == NULL) {
3658 			err = got_error_from_errno("strdup");
3659 			goto done;
3660 		}
3661 	}
3662 
3663 	/* XXX status walk can't deal with trailing slash! */
3664 	len = strlen(path);
3665 	while (len > 0 && path[len - 1] == '/') {
3666 		path[len - 1] = '\0';
3667 		len--;
3668 	}
3669 done:
3670 	free(resolved);
3671 	free(cwd);
3672 	if (err == NULL)
3673 		*wt_path = path;
3674 	else
3675 		free(path);
3676 	return err;
3677 }
3678 
3679 struct schedule_addition_args {
3680 	struct got_worktree *worktree;
3681 	struct got_fileindex *fileindex;
3682 	got_worktree_checkout_cb progress_cb;
3683 	void *progress_arg;
3684 	struct got_repository *repo;
3685 };
3686 
3687 static const struct got_error *
3688 schedule_addition(void *arg, unsigned char status, unsigned char staged_status,
3689     const char *relpath, struct got_object_id *blob_id,
3690     struct got_object_id *staged_blob_id, struct got_object_id *commit_id,
3691     int dirfd, const char *de_name)
3692 {
3693 	struct schedule_addition_args *a = arg;
3694 	const struct got_error *err = NULL;
3695 	struct got_fileindex_entry *ie;
3696 	struct stat sb;
3697 	char *ondisk_path;
3698 
3699 	if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path,
3700 	    relpath) == -1)
3701 		return got_error_from_errno("asprintf");
3702 
3703 	ie = got_fileindex_entry_get(a->fileindex, relpath, strlen(relpath));
3704 	if (ie) {
3705 		err = get_file_status(&status, &sb, ie, ondisk_path, dirfd,
3706 		    de_name, a->repo);
3707 		if (err)
3708 			goto done;
3709 		/* Re-adding an existing entry is a no-op. */
3710 		if (status == GOT_STATUS_ADD)
3711 			goto done;
3712 		err = got_error_path(relpath, GOT_ERR_FILE_STATUS);
3713 		if (err)
3714 			goto done;
3715 	}
3716 
3717 	if (status != GOT_STATUS_UNVERSIONED) {
3718 		err = got_error_path(ondisk_path, GOT_ERR_FILE_STATUS);
3719 		goto done;
3720 	}
3721 
3722 	err = got_fileindex_entry_alloc(&ie, relpath);
3723 	if (err)
3724 		goto done;
3725 	err = got_fileindex_entry_update(ie, ondisk_path, NULL, NULL, 1);
3726 	if (err) {
3727 		got_fileindex_entry_free(ie);
3728 		goto done;
3729 	}
3730 	err = got_fileindex_entry_add(a->fileindex, ie);
3731 	if (err) {
3732 		got_fileindex_entry_free(ie);
3733 		goto done;
3734 	}
3735 done:
3736 	free(ondisk_path);
3737 	if (err)
3738 		return err;
3739 	if (status == GOT_STATUS_ADD)
3740 		return NULL;
3741 	return (*a->progress_cb)(a->progress_arg, GOT_STATUS_ADD, relpath);
3742 }
3743 
3744 const struct got_error *
3745 got_worktree_schedule_add(struct got_worktree *worktree,
3746     struct got_pathlist_head *paths,
3747     got_worktree_checkout_cb progress_cb, void *progress_arg,
3748     struct got_repository *repo, int no_ignores)
3749 {
3750 	struct got_fileindex *fileindex = NULL;
3751 	char *fileindex_path = NULL;
3752 	const struct got_error *err = NULL, *sync_err, *unlockerr;
3753 	struct got_pathlist_entry *pe;
3754 	struct schedule_addition_args saa;
3755 
3756 	err = lock_worktree(worktree, LOCK_EX);
3757 	if (err)
3758 		return err;
3759 
3760 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
3761 	if (err)
3762 		goto done;
3763 
3764 	saa.worktree = worktree;
3765 	saa.fileindex = fileindex;
3766 	saa.progress_cb = progress_cb;
3767 	saa.progress_arg = progress_arg;
3768 	saa.repo = repo;
3769 
3770 	TAILQ_FOREACH(pe, paths, entry) {
3771 		err = worktree_status(worktree, pe->path, fileindex, repo,
3772 			schedule_addition, &saa, NULL, NULL, no_ignores, 0);
3773 		if (err)
3774 			break;
3775 	}
3776 	sync_err = sync_fileindex(fileindex, fileindex_path);
3777 	if (sync_err && err == NULL)
3778 		err = sync_err;
3779 done:
3780 	free(fileindex_path);
3781 	if (fileindex)
3782 		got_fileindex_free(fileindex);
3783 	unlockerr = lock_worktree(worktree, LOCK_SH);
3784 	if (unlockerr && err == NULL)
3785 		err = unlockerr;
3786 	return err;
3787 }
3788 
3789 struct schedule_deletion_args {
3790 	struct got_worktree *worktree;
3791 	struct got_fileindex *fileindex;
3792 	got_worktree_delete_cb progress_cb;
3793 	void *progress_arg;
3794 	struct got_repository *repo;
3795 	int delete_local_mods;
3796 	int keep_on_disk;
3797 	const char *status_codes;
3798 };
3799 
3800 static const struct got_error *
3801 schedule_for_deletion(void *arg, unsigned char status,
3802     unsigned char staged_status, const char *relpath,
3803     struct got_object_id *blob_id, struct got_object_id *staged_blob_id,
3804     struct got_object_id *commit_id, int dirfd, const char *de_name)
3805 {
3806 	struct schedule_deletion_args *a = arg;
3807 	const struct got_error *err = NULL;
3808 	struct got_fileindex_entry *ie = NULL;
3809 	struct stat sb;
3810 	char *ondisk_path, *parent = NULL;
3811 
3812 	ie = got_fileindex_entry_get(a->fileindex, relpath, strlen(relpath));
3813 	if (ie == NULL)
3814 		return got_error_path(relpath, GOT_ERR_BAD_PATH);
3815 
3816 	staged_status = get_staged_status(ie);
3817 	if (staged_status != GOT_STATUS_NO_CHANGE) {
3818 		if (staged_status == GOT_STATUS_DELETE)
3819 			return NULL;
3820 		return got_error_path(relpath, GOT_ERR_FILE_STAGED);
3821 	}
3822 
3823 	if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path,
3824 	    relpath) == -1)
3825 		return got_error_from_errno("asprintf");
3826 
3827 	err = get_file_status(&status, &sb, ie, ondisk_path, dirfd, de_name,
3828 	    a->repo);
3829 	if (err)
3830 		goto done;
3831 
3832 	if (a->status_codes) {
3833 		size_t ncodes = strlen(a->status_codes);
3834 		int i;
3835 		for (i = 0; i < ncodes ; i++) {
3836 			if (status == a->status_codes[i])
3837 				break;
3838 		}
3839 		if (i == ncodes) { 
3840 			/* Do not delete files in non-matching status. */
3841 			free(ondisk_path);
3842 			return NULL;
3843 		}
3844 		if (a->status_codes[i] != GOT_STATUS_MODIFY &&
3845 		    a->status_codes[i] != GOT_STATUS_MISSING) {
3846 			static char msg[64];
3847 			snprintf(msg, sizeof(msg),
3848 			    "invalid status code '%c'", a->status_codes[i]);
3849 			err = got_error_msg(GOT_ERR_FILE_STATUS, msg);
3850 			goto done;
3851 		}
3852 	}
3853 
3854 	if (status != GOT_STATUS_NO_CHANGE) {
3855 		if (status == GOT_STATUS_DELETE)
3856 			goto done;
3857 		if (status == GOT_STATUS_MODIFY && !a->delete_local_mods) {
3858 			err = got_error_path(relpath, GOT_ERR_FILE_MODIFIED);
3859 			goto done;
3860 		}
3861 		if (status != GOT_STATUS_MODIFY &&
3862 		    status != GOT_STATUS_MISSING) {
3863 			err = got_error_path(relpath, GOT_ERR_FILE_STATUS);
3864 			goto done;
3865 		}
3866 	}
3867 
3868 	if (!a->keep_on_disk && status != GOT_STATUS_MISSING) {
3869 		if (dirfd != -1) {
3870 			if (unlinkat(dirfd, de_name, 0) != 0) {
3871 				err = got_error_from_errno2("unlinkat",
3872 				    ondisk_path);
3873 				goto done;
3874 			}
3875 		} else if (unlink(ondisk_path) != 0) {
3876 			err = got_error_from_errno2("unlink", ondisk_path);
3877 			goto done;
3878 		}
3879 
3880 		parent = dirname(ondisk_path);
3881 
3882 		if (parent == NULL) {
3883 			err = got_error_from_errno2("dirname", ondisk_path);
3884 			goto done;
3885 		}
3886 		while (parent && strcmp(parent, a->worktree->root_path) != 0) {
3887 			if (rmdir(parent) == -1) {
3888 				if (errno != ENOTEMPTY)
3889 					err = got_error_from_errno2("rmdir",
3890 					    parent);
3891 				break;
3892 			}
3893 			parent = dirname(parent);
3894 			if (parent == NULL) {
3895 				err = got_error_from_errno2("dirname", parent);
3896 				goto done;
3897 			}
3898 		}
3899 	}
3900 
3901 	got_fileindex_entry_mark_deleted_from_disk(ie);
3902 done:
3903 	free(ondisk_path);
3904 	if (err)
3905 		return err;
3906 	if (status == GOT_STATUS_DELETE)
3907 		return NULL;
3908 	return (*a->progress_cb)(a->progress_arg, GOT_STATUS_DELETE,
3909 	    staged_status, relpath);
3910 }
3911 
3912 const struct got_error *
3913 got_worktree_schedule_delete(struct got_worktree *worktree,
3914     struct got_pathlist_head *paths, int delete_local_mods,
3915     const char *status_codes,
3916     got_worktree_delete_cb progress_cb, void *progress_arg,
3917     struct got_repository *repo, int keep_on_disk)
3918 {
3919 	struct got_fileindex *fileindex = NULL;
3920 	char *fileindex_path = NULL;
3921 	const struct got_error *err = NULL, *sync_err, *unlockerr;
3922 	struct got_pathlist_entry *pe;
3923 	struct schedule_deletion_args sda;
3924 
3925 	err = lock_worktree(worktree, LOCK_EX);
3926 	if (err)
3927 		return err;
3928 
3929 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
3930 	if (err)
3931 		goto done;
3932 
3933 	sda.worktree = worktree;
3934 	sda.fileindex = fileindex;
3935 	sda.progress_cb = progress_cb;
3936 	sda.progress_arg = progress_arg;
3937 	sda.repo = repo;
3938 	sda.delete_local_mods = delete_local_mods;
3939 	sda.keep_on_disk = keep_on_disk;
3940 	sda.status_codes = status_codes;
3941 
3942 	TAILQ_FOREACH(pe, paths, entry) {
3943 		err = worktree_status(worktree, pe->path, fileindex, repo,
3944 			schedule_for_deletion, &sda, NULL, NULL, 0, 1);
3945 		if (err)
3946 			break;
3947 	}
3948 	sync_err = sync_fileindex(fileindex, fileindex_path);
3949 	if (sync_err && err == NULL)
3950 		err = sync_err;
3951 done:
3952 	free(fileindex_path);
3953 	if (fileindex)
3954 		got_fileindex_free(fileindex);
3955 	unlockerr = lock_worktree(worktree, LOCK_SH);
3956 	if (unlockerr && err == NULL)
3957 		err = unlockerr;
3958 	return err;
3959 }
3960 
3961 static const struct got_error *
3962 copy_one_line(FILE *infile, FILE *outfile, FILE *rejectfile)
3963 {
3964 	const struct got_error *err = NULL;
3965 	char *line = NULL;
3966 	size_t linesize = 0, n;
3967 	ssize_t linelen;
3968 
3969 	linelen = getline(&line, &linesize, infile);
3970 	if (linelen == -1) {
3971 		if (ferror(infile)) {
3972 			err = got_error_from_errno("getline");
3973 			goto done;
3974 		}
3975 		return NULL;
3976 	}
3977 	if (outfile) {
3978 		n = fwrite(line, 1, linelen, outfile);
3979 		if (n != linelen) {
3980 			err = got_ferror(outfile, GOT_ERR_IO);
3981 			goto done;
3982 		}
3983 	}
3984 	if (rejectfile) {
3985 		n = fwrite(line, 1, linelen, rejectfile);
3986 		if (n != linelen)
3987 			err = got_ferror(outfile, GOT_ERR_IO);
3988 	}
3989 done:
3990 	free(line);
3991 	return err;
3992 }
3993 
3994 static const struct got_error *
3995 skip_one_line(FILE *f)
3996 {
3997 	char *line = NULL;
3998 	size_t linesize = 0;
3999 	ssize_t linelen;
4000 
4001 	linelen = getline(&line, &linesize, f);
4002 	if (linelen == -1) {
4003 		if (ferror(f))
4004 			return got_error_from_errno("getline");
4005 		return NULL;
4006 	}
4007 	free(line);
4008 	return NULL;
4009 }
4010 
4011 static const struct got_error *
4012 copy_change(FILE *f1, FILE *f2, int *line_cur1, int *line_cur2,
4013     int start_old, int end_old, int start_new, int end_new,
4014     FILE *outfile, FILE *rejectfile)
4015  {
4016 	const struct got_error *err;
4017 
4018 	/* Copy old file's lines leading up to patch. */
4019 	while (!feof(f1) && *line_cur1 < start_old) {
4020 		err = copy_one_line(f1, outfile, NULL);
4021 		if (err)
4022 			return err;
4023 		(*line_cur1)++;
4024 	}
4025 	/* Skip new file's lines leading up to patch. */
4026 	while (!feof(f2) && *line_cur2 < start_new) {
4027 		if (rejectfile)
4028 			err = copy_one_line(f2, NULL, rejectfile);
4029 		else
4030 			err = skip_one_line(f2);
4031 		if (err)
4032 			return err;
4033 		(*line_cur2)++;
4034 	}
4035 	/* Copy patched lines. */
4036 	while (!feof(f2) && *line_cur2 <= end_new) {
4037 		err = copy_one_line(f2, outfile, NULL);
4038 		if (err)
4039 			return err;
4040 		(*line_cur2)++;
4041 	}
4042 	/* Skip over old file's replaced lines. */
4043 	while (!feof(f1) && *line_cur1 <= end_old) {
4044 		if (rejectfile)
4045 			err = copy_one_line(f1, NULL, rejectfile);
4046 		else
4047 			err = skip_one_line(f1);
4048 		if (err)
4049 			return err;
4050 		(*line_cur1)++;
4051 	}
4052 
4053 	return NULL;
4054 }
4055 
4056 static const struct got_error *
4057 copy_remaining_content(FILE *f1, FILE *f2, int *line_cur1, int *line_cur2,
4058     FILE *outfile, FILE *rejectfile)
4059 {
4060 	const struct got_error *err;
4061 
4062 	if (outfile) {
4063 		/* Copy old file's lines until EOF. */
4064 		while (!feof(f1)) {
4065 			err = copy_one_line(f1, outfile, NULL);
4066 			if (err)
4067 				return err;
4068 			(*line_cur1)++;
4069 		}
4070 	}
4071 	if (rejectfile) {
4072 		/* Copy new file's lines until EOF. */
4073 		while (!feof(f2)) {
4074 			err = copy_one_line(f2, NULL, rejectfile);
4075 			if (err)
4076 				return err;
4077 			(*line_cur2)++;
4078 		}
4079 	}
4080 
4081 	return NULL;
4082 }
4083 
4084 static const struct got_error *
4085 apply_or_reject_change(int *choice, struct got_diff_change *change, int n,
4086     int nchanges, struct got_diff_state *ds, struct got_diff_args *args,
4087     int diff_flags, const char *relpath, FILE *f1, FILE *f2, int *line_cur1,
4088     int *line_cur2, FILE *outfile, FILE *rejectfile,
4089     got_worktree_patch_cb patch_cb, void *patch_arg)
4090 {
4091 	const struct got_error *err = NULL;
4092 	int start_old = change->cv.a;
4093 	int end_old = change->cv.b;
4094 	int start_new = change->cv.c;
4095 	int end_new = change->cv.d;
4096 	long pos1, pos2;
4097 	FILE *hunkfile;
4098 
4099 	*choice = GOT_PATCH_CHOICE_NONE;
4100 
4101 	hunkfile = got_opentemp();
4102 	if (hunkfile == NULL)
4103 		return got_error_from_errno("got_opentemp");
4104 
4105 	pos1 = ftell(f1);
4106 	pos2 = ftell(f2);
4107 
4108 	/* XXX TODO needs error checking */
4109 	got_diff_dump_change(hunkfile, change, ds, args, f1, f2, diff_flags);
4110 
4111 	if (fseek(f1, pos1, SEEK_SET) == -1) {
4112 		err = got_ferror(f1, GOT_ERR_IO);
4113 		goto done;
4114 	}
4115 	if (fseek(f2, pos2, SEEK_SET) == -1) {
4116 		err = got_ferror(f1, GOT_ERR_IO);
4117 		goto done;
4118 	}
4119 	if (fseek(hunkfile, 0L, SEEK_SET) == -1) {
4120 		err = got_ferror(hunkfile, GOT_ERR_IO);
4121 		goto done;
4122 	}
4123 
4124 	err = (*patch_cb)(choice, patch_arg, GOT_STATUS_MODIFY, relpath,
4125 	    hunkfile, n, nchanges);
4126 	if (err)
4127 		goto done;
4128 
4129 	switch (*choice) {
4130 	case GOT_PATCH_CHOICE_YES:
4131 		err = copy_change(f1, f2, line_cur1, line_cur2, start_old,
4132 		    end_old, start_new, end_new, outfile, rejectfile);
4133 		break;
4134 	case GOT_PATCH_CHOICE_NO:
4135 		err = copy_change(f1, f2, line_cur1, line_cur2, start_old,
4136 		    end_old, start_new, end_new, rejectfile, outfile);
4137 		break;
4138 	case GOT_PATCH_CHOICE_QUIT:
4139 		break;
4140 	default:
4141 		err = got_error(GOT_ERR_PATCH_CHOICE);
4142 		break;
4143 	}
4144 done:
4145 	if (hunkfile && fclose(hunkfile) == EOF && err == NULL)
4146 		err = got_error_from_errno("fclose");
4147 	return err;
4148 }
4149 
4150 struct revert_file_args {
4151 	struct got_worktree *worktree;
4152 	struct got_fileindex *fileindex;
4153 	got_worktree_checkout_cb progress_cb;
4154 	void *progress_arg;
4155 	got_worktree_patch_cb patch_cb;
4156 	void *patch_arg;
4157 	struct got_repository *repo;
4158 };
4159 
4160 static const struct got_error *
4161 create_patched_content(char **path_outfile, int reverse_patch,
4162     struct got_object_id *blob_id, const char *path2,
4163     int dirfd2, const char *de_name2,
4164     const char *relpath, struct got_repository *repo,
4165     got_worktree_patch_cb patch_cb, void *patch_arg)
4166 {
4167 	const struct got_error *err;
4168 	struct got_blob_object *blob = NULL;
4169 	FILE *f1 = NULL, *f2 = NULL, *outfile = NULL;
4170 	int fd2 = -1;
4171 	char link_target[PATH_MAX];
4172 	ssize_t link_len = 0;
4173 	char *path1 = NULL, *id_str = NULL;
4174 	struct stat sb1, sb2;
4175 	struct got_diff_changes *changes = NULL;
4176 	struct got_diff_state *ds = NULL;
4177 	struct got_diff_args *args = NULL;
4178 	struct got_diff_change *change;
4179 	int diff_flags = 0, line_cur1 = 1, line_cur2 = 1, have_content = 0;
4180 	int n = 0;
4181 
4182 	*path_outfile = NULL;
4183 
4184 	err = got_object_id_str(&id_str, blob_id);
4185 	if (err)
4186 		return err;
4187 
4188 	if (dirfd2 != -1) {
4189 		fd2 = openat(dirfd2, de_name2, O_RDONLY | O_NOFOLLOW);
4190 		if (fd2 == -1) {
4191 			if (errno != ELOOP) {
4192 				err = got_error_from_errno2("openat", path2);
4193 				goto done;
4194 			}
4195 			link_len = readlinkat(dirfd2, de_name2,
4196 			    link_target, sizeof(link_target));
4197 			if (link_len == -1)
4198 				return got_error_from_errno2("readlinkat", path2);
4199 			sb2.st_mode = S_IFLNK;
4200 			sb2.st_size = link_len;
4201 		}
4202 	} else {
4203 		fd2 = open(path2, O_RDONLY | O_NOFOLLOW);
4204 		if (fd2 == -1) {
4205 			if (errno != ELOOP) {
4206 				err = got_error_from_errno2("open", path2);
4207 				goto done;
4208 			}
4209 			link_len = readlink(path2, link_target,
4210 			    sizeof(link_target));
4211 			if (link_len == -1)
4212 				return got_error_from_errno2("readlink", path2);
4213 			sb2.st_mode = S_IFLNK;
4214 			sb2.st_size = link_len;
4215 		}
4216 	}
4217 	if (fd2 != -1) {
4218 		if (fstat(fd2, &sb2) == -1) {
4219 			err = got_error_from_errno2("fstat", path2);
4220 			goto done;
4221 		}
4222 
4223 		f2 = fdopen(fd2, "r");
4224 		if (f2 == NULL) {
4225 			err = got_error_from_errno2("fdopen", path2);
4226 			goto done;
4227 		}
4228 		fd2 = -1;
4229 	} else {
4230 		size_t n;
4231 		f2 = got_opentemp();
4232 		if (f2 == NULL) {
4233 			err = got_error_from_errno2("got_opentemp", path2);
4234 			goto done;
4235 		}
4236 		n = fwrite(link_target, 1, link_len, f2);
4237 		if (n != link_len) {
4238 			err = got_ferror(f2, GOT_ERR_IO);
4239 			goto done;
4240 		}
4241 		if (fflush(f2) == EOF) {
4242 			err = got_error_from_errno("fflush");
4243 			goto done;
4244 		}
4245 		rewind(f2);
4246 	}
4247 
4248 	err = got_object_open_as_blob(&blob, repo, blob_id, 8192);
4249 	if (err)
4250 		goto done;
4251 
4252 	err = got_opentemp_named(&path1, &f1, "got-patched-blob");
4253 	if (err)
4254 		goto done;
4255 
4256 	err = got_object_blob_dump_to_file(NULL, NULL, NULL, f1, blob);
4257 	if (err)
4258 		goto done;
4259 
4260 	if (stat(path1, &sb1) == -1) {
4261 		err = got_error_from_errno2("stat", path1);
4262 		goto done;
4263 	}
4264 
4265 	err = got_diff_files(&changes, &ds, &args, &diff_flags,
4266 	    f1, sb1.st_size, id_str, f2, sb2.st_size, path2, 3, NULL);
4267 	if (err)
4268 		goto done;
4269 
4270 	err = got_opentemp_named(path_outfile, &outfile, "got-patched-content");
4271 	if (err)
4272 		goto done;
4273 
4274 	if (fseek(f1, 0L, SEEK_SET) == -1)
4275 		return got_ferror(f1, GOT_ERR_IO);
4276 	if (fseek(f2, 0L, SEEK_SET) == -1)
4277 		return got_ferror(f2, GOT_ERR_IO);
4278 	SIMPLEQ_FOREACH(change, &changes->entries, entry) {
4279 		int choice;
4280 		err = apply_or_reject_change(&choice, change, ++n,
4281 		    changes->nchanges, ds, args, diff_flags, relpath,
4282 		    f1, f2, &line_cur1, &line_cur2,
4283 		    reverse_patch ? NULL : outfile,
4284 		    reverse_patch ? outfile : NULL,
4285 		    patch_cb, patch_arg);
4286 		if (err)
4287 			goto done;
4288 		if (choice == GOT_PATCH_CHOICE_YES)
4289 			have_content = 1;
4290 		else if (choice == GOT_PATCH_CHOICE_QUIT)
4291 			break;
4292 	}
4293 	if (have_content) {
4294 		err = copy_remaining_content(f1, f2, &line_cur1, &line_cur2,
4295 		    reverse_patch ? NULL : outfile,
4296 		    reverse_patch ? outfile : NULL);
4297 		if (err)
4298 			goto done;
4299 
4300 		if (!S_ISLNK(sb2.st_mode)) {
4301 			if (chmod(*path_outfile, sb2.st_mode) == -1) {
4302 				err = got_error_from_errno2("chmod", path2);
4303 				goto done;
4304 			}
4305 		}
4306 	}
4307 done:
4308 	free(id_str);
4309 	if (blob)
4310 		got_object_blob_close(blob);
4311 	if (f1 && fclose(f1) == EOF && err == NULL)
4312 		err = got_error_from_errno2("fclose", path1);
4313 	if (f2 && fclose(f2) == EOF && err == NULL)
4314 		err = got_error_from_errno2("fclose", path2);
4315 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
4316 		err = got_error_from_errno2("close", path2);
4317 	if (outfile && fclose(outfile) == EOF && err == NULL)
4318 		err = got_error_from_errno2("fclose", *path_outfile);
4319 	if (path1 && unlink(path1) == -1 && err == NULL)
4320 		err = got_error_from_errno2("unlink", path1);
4321 	if (err || !have_content) {
4322 		if (*path_outfile && unlink(*path_outfile) == -1 && err == NULL)
4323 			err = got_error_from_errno2("unlink", *path_outfile);
4324 		free(*path_outfile);
4325 		*path_outfile = NULL;
4326 	}
4327 	free(args);
4328 	if (ds) {
4329 		got_diff_state_free(ds);
4330 		free(ds);
4331 	}
4332 	if (changes)
4333 		got_diff_free_changes(changes);
4334 	free(path1);
4335 	return err;
4336 }
4337 
4338 static const struct got_error *
4339 revert_file(void *arg, unsigned char status, unsigned char staged_status,
4340     const char *relpath, struct got_object_id *blob_id,
4341     struct got_object_id *staged_blob_id, struct got_object_id *commit_id,
4342     int dirfd, const char *de_name)
4343 {
4344 	struct revert_file_args *a = arg;
4345 	const struct got_error *err = NULL;
4346 	char *parent_path = NULL;
4347 	struct got_fileindex_entry *ie;
4348 	struct got_tree_object *tree = NULL;
4349 	struct got_object_id *tree_id = NULL;
4350 	const struct got_tree_entry *te = NULL;
4351 	char *tree_path = NULL, *te_name;
4352 	char *ondisk_path = NULL, *path_content = NULL;
4353 	struct got_blob_object *blob = NULL;
4354 
4355 	/* Reverting a staged deletion is a no-op. */
4356 	if (status == GOT_STATUS_DELETE &&
4357 	    staged_status != GOT_STATUS_NO_CHANGE)
4358 		return NULL;
4359 
4360 	if (status == GOT_STATUS_UNVERSIONED)
4361 		return (*a->progress_cb)(a->progress_arg,
4362 		    GOT_STATUS_UNVERSIONED, relpath);
4363 
4364 	ie = got_fileindex_entry_get(a->fileindex, relpath, strlen(relpath));
4365 	if (ie == NULL)
4366 		return got_error_path(relpath, GOT_ERR_BAD_PATH);
4367 
4368 	/* Construct in-repository path of tree which contains this blob. */
4369 	err = got_path_dirname(&parent_path, ie->path);
4370 	if (err) {
4371 		if (err->code != GOT_ERR_BAD_PATH)
4372 			goto done;
4373 		parent_path = strdup("/");
4374 		if (parent_path == NULL) {
4375 			err = got_error_from_errno("strdup");
4376 			goto done;
4377 		}
4378 	}
4379 	if (got_path_is_root_dir(a->worktree->path_prefix)) {
4380 		tree_path = strdup(parent_path);
4381 		if (tree_path == NULL) {
4382 			err = got_error_from_errno("strdup");
4383 			goto done;
4384 		}
4385 	} else {
4386 		if (got_path_is_root_dir(parent_path)) {
4387 			tree_path = strdup(a->worktree->path_prefix);
4388 			if (tree_path == NULL) {
4389 				err = got_error_from_errno("strdup");
4390 				goto done;
4391 			}
4392 		} else {
4393 			if (asprintf(&tree_path, "%s/%s",
4394 			    a->worktree->path_prefix, parent_path) == -1) {
4395 				err = got_error_from_errno("asprintf");
4396 				goto done;
4397 			}
4398 		}
4399 	}
4400 
4401 	err = got_object_id_by_path(&tree_id, a->repo,
4402 	    a->worktree->base_commit_id, tree_path);
4403 	if (err) {
4404 		if (!(err->code == GOT_ERR_NO_TREE_ENTRY &&
4405 		    (status == GOT_STATUS_ADD ||
4406 		    staged_status == GOT_STATUS_ADD)))
4407 			goto done;
4408 	} else {
4409 		err = got_object_open_as_tree(&tree, a->repo, tree_id);
4410 		if (err)
4411 			goto done;
4412 
4413 		te_name = basename(ie->path);
4414 		if (te_name == NULL) {
4415 			err = got_error_from_errno2("basename", ie->path);
4416 			goto done;
4417 		}
4418 
4419 		te = got_object_tree_find_entry(tree, te_name);
4420 		if (te == NULL && status != GOT_STATUS_ADD &&
4421 		    staged_status != GOT_STATUS_ADD) {
4422 			err = got_error_path(ie->path, GOT_ERR_NO_TREE_ENTRY);
4423 			goto done;
4424 		}
4425 	}
4426 
4427 	switch (status) {
4428 	case GOT_STATUS_ADD:
4429 		if (a->patch_cb) {
4430 			int choice = GOT_PATCH_CHOICE_NONE;
4431 			err = (*a->patch_cb)(&choice, a->patch_arg,
4432 			    status, ie->path, NULL, 1, 1);
4433 			if (err)
4434 				goto done;
4435 			if (choice != GOT_PATCH_CHOICE_YES)
4436 				break;
4437 		}
4438 		err = (*a->progress_cb)(a->progress_arg, GOT_STATUS_REVERT,
4439 		    ie->path);
4440 		if (err)
4441 			goto done;
4442 		got_fileindex_entry_remove(a->fileindex, ie);
4443 		break;
4444 	case GOT_STATUS_DELETE:
4445 		if (a->patch_cb) {
4446 			int choice = GOT_PATCH_CHOICE_NONE;
4447 			err = (*a->patch_cb)(&choice, a->patch_arg,
4448 			    status, ie->path, NULL, 1, 1);
4449 			if (err)
4450 				goto done;
4451 			if (choice != GOT_PATCH_CHOICE_YES)
4452 				break;
4453 		}
4454 		/* fall through */
4455 	case GOT_STATUS_MODIFY:
4456 	case GOT_STATUS_MODE_CHANGE:
4457 	case GOT_STATUS_CONFLICT:
4458 	case GOT_STATUS_MISSING: {
4459 		struct got_object_id id;
4460 		if (staged_status == GOT_STATUS_ADD ||
4461 		    staged_status == GOT_STATUS_MODIFY) {
4462 			memcpy(id.sha1, ie->staged_blob_sha1,
4463 			    SHA1_DIGEST_LENGTH);
4464 		} else
4465 			memcpy(id.sha1, ie->blob_sha1,
4466 			    SHA1_DIGEST_LENGTH);
4467 		err = got_object_open_as_blob(&blob, a->repo, &id, 8192);
4468 		if (err)
4469 			goto done;
4470 
4471 		if (asprintf(&ondisk_path, "%s/%s",
4472 		    got_worktree_get_root_path(a->worktree), relpath) == -1) {
4473 			err = got_error_from_errno("asprintf");
4474 			goto done;
4475 		}
4476 
4477 		if (a->patch_cb && (status == GOT_STATUS_MODIFY ||
4478 		    status == GOT_STATUS_CONFLICT)) {
4479 			int is_bad_symlink = 0;
4480 			err = create_patched_content(&path_content, 1, &id,
4481 			    ondisk_path, dirfd, de_name, ie->path, a->repo,
4482 			    a->patch_cb, a->patch_arg);
4483 			if (err || path_content == NULL)
4484 				break;
4485 			if (te && S_ISLNK(te->mode)) {
4486 				if (unlink(path_content) == -1) {
4487 					err = got_error_from_errno2("unlink",
4488 					    path_content);
4489 					break;
4490 				}
4491 				err = install_symlink(&is_bad_symlink,
4492 				    a->worktree, ondisk_path, ie->path,
4493 				    blob, 0, 1, 0, a->repo,
4494 				    a->progress_cb, a->progress_arg);
4495 			} else {
4496 				if (rename(path_content, ondisk_path) == -1) {
4497 					err = got_error_from_errno3("rename",
4498 					    path_content, ondisk_path);
4499 					goto done;
4500 				}
4501 			}
4502 		} else {
4503 			int is_bad_symlink = 0;
4504 			if (te && S_ISLNK(te->mode)) {
4505 				err = install_symlink(&is_bad_symlink,
4506 				    a->worktree, ondisk_path, ie->path,
4507 				    blob, 0, 1, 0, a->repo,
4508 				    a->progress_cb, a->progress_arg);
4509 			} else {
4510 				err = install_blob(a->worktree, ondisk_path,
4511 				    ie->path,
4512 				    te ? te->mode : GOT_DEFAULT_FILE_MODE,
4513 				    got_fileindex_perms_to_st(ie), blob,
4514 				    0, 1, 0, 0, a->repo,
4515 				    a->progress_cb, a->progress_arg);
4516 			}
4517 			if (err)
4518 				goto done;
4519 			if (status == GOT_STATUS_DELETE ||
4520 			    status == GOT_STATUS_MODE_CHANGE) {
4521 				err = got_fileindex_entry_update(ie,
4522 				    ondisk_path, blob->id.sha1,
4523 				    a->worktree->base_commit_id->sha1, 1);
4524 				if (err)
4525 					goto done;
4526 			}
4527 			if (is_bad_symlink) {
4528 				got_fileindex_entry_filetype_set(ie,
4529 				    GOT_FILEIDX_MODE_BAD_SYMLINK);
4530 			}
4531 		}
4532 		break;
4533 	}
4534 	default:
4535 		break;
4536 	}
4537 done:
4538 	free(ondisk_path);
4539 	free(path_content);
4540 	free(parent_path);
4541 	free(tree_path);
4542 	if (blob)
4543 		got_object_blob_close(blob);
4544 	if (tree)
4545 		got_object_tree_close(tree);
4546 	free(tree_id);
4547 	return err;
4548 }
4549 
4550 const struct got_error *
4551 got_worktree_revert(struct got_worktree *worktree,
4552     struct got_pathlist_head *paths,
4553     got_worktree_checkout_cb progress_cb, void *progress_arg,
4554     got_worktree_patch_cb patch_cb, void *patch_arg,
4555     struct got_repository *repo)
4556 {
4557 	struct got_fileindex *fileindex = NULL;
4558 	char *fileindex_path = NULL;
4559 	const struct got_error *err = NULL, *unlockerr = NULL;
4560 	const struct got_error *sync_err = NULL;
4561 	struct got_pathlist_entry *pe;
4562 	struct revert_file_args rfa;
4563 
4564 	err = lock_worktree(worktree, LOCK_EX);
4565 	if (err)
4566 		return err;
4567 
4568 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
4569 	if (err)
4570 		goto done;
4571 
4572 	rfa.worktree = worktree;
4573 	rfa.fileindex = fileindex;
4574 	rfa.progress_cb = progress_cb;
4575 	rfa.progress_arg = progress_arg;
4576 	rfa.patch_cb = patch_cb;
4577 	rfa.patch_arg = patch_arg;
4578 	rfa.repo = repo;
4579 	TAILQ_FOREACH(pe, paths, entry) {
4580 		err = worktree_status(worktree, pe->path, fileindex, repo,
4581 		    revert_file, &rfa, NULL, NULL, 0, 0);
4582 		if (err)
4583 			break;
4584 	}
4585 	sync_err = sync_fileindex(fileindex, fileindex_path);
4586 	if (sync_err && err == NULL)
4587 		err = sync_err;
4588 done:
4589 	free(fileindex_path);
4590 	if (fileindex)
4591 		got_fileindex_free(fileindex);
4592 	unlockerr = lock_worktree(worktree, LOCK_SH);
4593 	if (unlockerr && err == NULL)
4594 		err = unlockerr;
4595 	return err;
4596 }
4597 
4598 static void
4599 free_commitable(struct got_commitable *ct)
4600 {
4601 	free(ct->path);
4602 	free(ct->in_repo_path);
4603 	free(ct->ondisk_path);
4604 	free(ct->blob_id);
4605 	free(ct->base_blob_id);
4606 	free(ct->staged_blob_id);
4607 	free(ct->base_commit_id);
4608 	free(ct);
4609 }
4610 
4611 struct collect_commitables_arg {
4612 	struct got_pathlist_head *commitable_paths;
4613 	struct got_repository *repo;
4614 	struct got_worktree *worktree;
4615 	struct got_fileindex *fileindex;
4616 	int have_staged_files;
4617 	int allow_bad_symlinks;
4618 };
4619 
4620 static const struct got_error *
4621 collect_commitables(void *arg, unsigned char status,
4622     unsigned char staged_status, const char *relpath,
4623     struct got_object_id *blob_id, struct got_object_id *staged_blob_id,
4624     struct got_object_id *commit_id, int dirfd, const char *de_name)
4625 {
4626 	struct collect_commitables_arg *a = arg;
4627 	const struct got_error *err = NULL;
4628 	struct got_commitable *ct = NULL;
4629 	struct got_pathlist_entry *new = NULL;
4630 	char *parent_path = NULL, *path = NULL;
4631 	struct stat sb;
4632 
4633 	if (a->have_staged_files) {
4634 		if (staged_status != GOT_STATUS_MODIFY &&
4635 		    staged_status != GOT_STATUS_ADD &&
4636 		    staged_status != GOT_STATUS_DELETE)
4637 			return NULL;
4638 	} else {
4639 		if (status == GOT_STATUS_CONFLICT)
4640 			return got_error(GOT_ERR_COMMIT_CONFLICT);
4641 
4642 		if (status != GOT_STATUS_MODIFY &&
4643 		    status != GOT_STATUS_MODE_CHANGE &&
4644 		    status != GOT_STATUS_ADD &&
4645 		    status != GOT_STATUS_DELETE)
4646 			return NULL;
4647 	}
4648 
4649 	if (asprintf(&path, "/%s", relpath) == -1) {
4650 		err = got_error_from_errno("asprintf");
4651 		goto done;
4652 	}
4653 	if (strcmp(path, "/") == 0) {
4654 		parent_path = strdup("");
4655 		if (parent_path == NULL)
4656 			return got_error_from_errno("strdup");
4657 	} else {
4658 		err = got_path_dirname(&parent_path, path);
4659 		if (err)
4660 			return err;
4661 	}
4662 
4663 	ct = calloc(1, sizeof(*ct));
4664 	if (ct == NULL) {
4665 		err = got_error_from_errno("calloc");
4666 		goto done;
4667 	}
4668 
4669 	if (asprintf(&ct->ondisk_path, "%s/%s", a->worktree->root_path,
4670 	    relpath) == -1) {
4671 		err = got_error_from_errno("asprintf");
4672 		goto done;
4673 	}
4674 
4675 	if (staged_status == GOT_STATUS_ADD ||
4676 	    staged_status == GOT_STATUS_MODIFY) {
4677 		struct got_fileindex_entry *ie;
4678 		ie = got_fileindex_entry_get(a->fileindex, path, strlen(path));
4679 		switch (got_fileindex_entry_staged_filetype_get(ie)) {
4680 		case GOT_FILEIDX_MODE_REGULAR_FILE:
4681 		case GOT_FILEIDX_MODE_BAD_SYMLINK:
4682 			ct->mode = S_IFREG;
4683 			break;
4684 		case GOT_FILEIDX_MODE_SYMLINK:
4685 			ct->mode = S_IFLNK;
4686 			break;
4687 		default:
4688 			err = got_error_path(path, GOT_ERR_BAD_FILETYPE);
4689 			goto done;
4690 		}
4691 		ct->mode |= got_fileindex_entry_perms_get(ie);
4692 	} else if (status != GOT_STATUS_DELETE &&
4693 	    staged_status != GOT_STATUS_DELETE) {
4694 		if (dirfd != -1) {
4695 			if (fstatat(dirfd, de_name, &sb,
4696 			    AT_SYMLINK_NOFOLLOW) == -1) {
4697 				err = got_error_from_errno2("fstatat",
4698 				    ct->ondisk_path);
4699 				goto done;
4700 			}
4701 		} else if (lstat(ct->ondisk_path, &sb) == -1) {
4702 			err = got_error_from_errno2("lstat", ct->ondisk_path);
4703 			goto done;
4704 		}
4705 		ct->mode = sb.st_mode;
4706 	}
4707 
4708 	if (asprintf(&ct->in_repo_path, "%s%s%s", a->worktree->path_prefix,
4709 	    got_path_is_root_dir(a->worktree->path_prefix) ? "" : "/",
4710 	    relpath) == -1) {
4711 		err = got_error_from_errno("asprintf");
4712 		goto done;
4713 	}
4714 
4715 	if (S_ISLNK(ct->mode) && staged_status == GOT_STATUS_NO_CHANGE &&
4716 	    status == GOT_STATUS_ADD && !a->allow_bad_symlinks) {
4717 		int is_bad_symlink;
4718 		char target_path[PATH_MAX];
4719 		ssize_t target_len;
4720 		target_len = readlink(ct->ondisk_path, target_path,
4721 		    sizeof(target_path));
4722 		if (target_len == -1) {
4723 			err = got_error_from_errno2("readlink",
4724 			    ct->ondisk_path);
4725 			goto done;
4726 		}
4727 		err = is_bad_symlink_target(&is_bad_symlink, target_path,
4728 		    target_len, ct->ondisk_path, a->worktree->root_path);
4729 		if (err)
4730 			goto done;
4731 		if (is_bad_symlink) {
4732 			err = got_error_path(ct->ondisk_path,
4733 			    GOT_ERR_BAD_SYMLINK);
4734 			goto done;
4735 		}
4736 	}
4737 
4738 
4739 	ct->status = status;
4740 	ct->staged_status = staged_status;
4741 	ct->blob_id = NULL; /* will be filled in when blob gets created */
4742 	if (ct->status != GOT_STATUS_ADD &&
4743 	    ct->staged_status != GOT_STATUS_ADD) {
4744 		ct->base_blob_id = got_object_id_dup(blob_id);
4745 		if (ct->base_blob_id == NULL) {
4746 			err = got_error_from_errno("got_object_id_dup");
4747 			goto done;
4748 		}
4749 		ct->base_commit_id = got_object_id_dup(commit_id);
4750 		if (ct->base_commit_id == NULL) {
4751 			err = got_error_from_errno("got_object_id_dup");
4752 			goto done;
4753 		}
4754 	}
4755 	if (ct->staged_status == GOT_STATUS_ADD ||
4756 	    ct->staged_status == GOT_STATUS_MODIFY) {
4757 		ct->staged_blob_id = got_object_id_dup(staged_blob_id);
4758 		if (ct->staged_blob_id == NULL) {
4759 			err = got_error_from_errno("got_object_id_dup");
4760 			goto done;
4761 		}
4762 	}
4763 	ct->path = strdup(path);
4764 	if (ct->path == NULL) {
4765 		err = got_error_from_errno("strdup");
4766 		goto done;
4767 	}
4768 	err = got_pathlist_insert(&new, a->commitable_paths, ct->path, ct);
4769 done:
4770 	if (ct && (err || new == NULL))
4771 		free_commitable(ct);
4772 	free(parent_path);
4773 	free(path);
4774 	return err;
4775 }
4776 
4777 static const struct got_error *write_tree(struct got_object_id **, int *,
4778     struct got_tree_object *, const char *, struct got_pathlist_head *,
4779     got_worktree_status_cb status_cb, void *status_arg,
4780     struct got_repository *);
4781 
4782 static const struct got_error *
4783 write_subtree(struct got_object_id **new_subtree_id, int *nentries,
4784     struct got_tree_entry *te, const char *parent_path,
4785     struct got_pathlist_head *commitable_paths,
4786     got_worktree_status_cb status_cb, void *status_arg,
4787     struct got_repository *repo)
4788 {
4789 	const struct got_error *err = NULL;
4790 	struct got_tree_object *subtree;
4791 	char *subpath;
4792 
4793 	if (asprintf(&subpath, "%s%s%s", parent_path,
4794 	    got_path_is_root_dir(parent_path) ? "" : "/", te->name) == -1)
4795 		return got_error_from_errno("asprintf");
4796 
4797 	err = got_object_open_as_tree(&subtree, repo, &te->id);
4798 	if (err)
4799 		return err;
4800 
4801 	err = write_tree(new_subtree_id, nentries, subtree, subpath,
4802 	    commitable_paths, status_cb, status_arg, repo);
4803 	got_object_tree_close(subtree);
4804 	free(subpath);
4805 	return err;
4806 }
4807 
4808 static const struct got_error *
4809 match_ct_parent_path(int *match, struct got_commitable *ct, const char *path)
4810 {
4811 	const struct got_error *err = NULL;
4812 	char *ct_parent_path = NULL;
4813 
4814 	*match = 0;
4815 
4816 	if (strchr(ct->in_repo_path, '/') == NULL) {
4817 		*match = got_path_is_root_dir(path);
4818 		return NULL;
4819 	}
4820 
4821 	err = got_path_dirname(&ct_parent_path, ct->in_repo_path);
4822 	if (err)
4823 		return err;
4824 	*match = (strcmp(path, ct_parent_path) == 0);
4825 	free(ct_parent_path);
4826 	return err;
4827 }
4828 
4829 static mode_t
4830 get_ct_file_mode(struct got_commitable *ct)
4831 {
4832 	if (S_ISLNK(ct->mode))
4833 		return S_IFLNK;
4834 
4835 	return S_IFREG | (ct->mode & ((S_IRWXU | S_IRWXG | S_IRWXO)));
4836 }
4837 
4838 static const struct got_error *
4839 alloc_modified_blob_tree_entry(struct got_tree_entry **new_te,
4840     struct got_tree_entry *te, struct got_commitable *ct)
4841 {
4842 	const struct got_error *err = NULL;
4843 
4844 	*new_te = NULL;
4845 
4846 	err = got_object_tree_entry_dup(new_te, te);
4847 	if (err)
4848 		goto done;
4849 
4850 	(*new_te)->mode = get_ct_file_mode(ct);
4851 
4852 	if (ct->staged_status == GOT_STATUS_MODIFY)
4853 		memcpy(&(*new_te)->id, ct->staged_blob_id,
4854 		    sizeof((*new_te)->id));
4855 	else
4856 		memcpy(&(*new_te)->id, ct->blob_id, sizeof((*new_te)->id));
4857 done:
4858 	if (err && *new_te) {
4859 		free(*new_te);
4860 		*new_te = NULL;
4861 	}
4862 	return err;
4863 }
4864 
4865 static const struct got_error *
4866 alloc_added_blob_tree_entry(struct got_tree_entry **new_te,
4867     struct got_commitable *ct)
4868 {
4869 	const struct got_error *err = NULL;
4870 	char *ct_name;
4871 
4872 	 *new_te = NULL;
4873 
4874 	*new_te = calloc(1, sizeof(**new_te));
4875 	if (*new_te == NULL)
4876 		return got_error_from_errno("calloc");
4877 
4878 	ct_name = basename(ct->path);
4879 	if (ct_name == NULL) {
4880 		err = got_error_from_errno2("basename", ct->path);
4881 		goto done;
4882 	}
4883 	if (strlcpy((*new_te)->name, ct_name, sizeof((*new_te)->name)) >=
4884 	    sizeof((*new_te)->name)) {
4885 		err = got_error(GOT_ERR_NO_SPACE);
4886 		goto done;
4887 	}
4888 
4889 	(*new_te)->mode = get_ct_file_mode(ct);
4890 
4891 	if (ct->staged_status == GOT_STATUS_ADD)
4892 		memcpy(&(*new_te)->id, ct->staged_blob_id,
4893 		    sizeof((*new_te)->id));
4894 	else
4895 		memcpy(&(*new_te)->id, ct->blob_id, sizeof((*new_te)->id));
4896 done:
4897 	if (err && *new_te) {
4898 		free(*new_te);
4899 		*new_te = NULL;
4900 	}
4901 	return err;
4902 }
4903 
4904 static const struct got_error *
4905 insert_tree_entry(struct got_tree_entry *new_te,
4906     struct got_pathlist_head *paths)
4907 {
4908 	const struct got_error *err = NULL;
4909 	struct got_pathlist_entry *new_pe;
4910 
4911 	err = got_pathlist_insert(&new_pe, paths, new_te->name, new_te);
4912 	if (err)
4913 		return err;
4914 	if (new_pe == NULL)
4915 		return got_error(GOT_ERR_TREE_DUP_ENTRY);
4916 	return NULL;
4917 }
4918 
4919 static const struct got_error *
4920 report_ct_status(struct got_commitable *ct,
4921     got_worktree_status_cb status_cb, void *status_arg)
4922 {
4923 	const char *ct_path = ct->path;
4924 	unsigned char status;
4925 
4926 	while (ct_path[0] == '/')
4927 		ct_path++;
4928 
4929 	if (ct->staged_status != GOT_STATUS_NO_CHANGE)
4930 		status = ct->staged_status;
4931 	else
4932 		status = ct->status;
4933 
4934 	return (*status_cb)(status_arg, status, GOT_STATUS_NO_CHANGE,
4935 	    ct_path, ct->blob_id, NULL, NULL, -1, NULL);
4936 }
4937 
4938 static const struct got_error *
4939 match_modified_subtree(int *modified, struct got_tree_entry *te,
4940     const char *base_tree_path, struct got_pathlist_head *commitable_paths)
4941 {
4942 	const struct got_error *err = NULL;
4943 	struct got_pathlist_entry *pe;
4944 	char *te_path;
4945 
4946 	*modified = 0;
4947 
4948 	if (asprintf(&te_path, "%s%s%s", base_tree_path,
4949 	    got_path_is_root_dir(base_tree_path) ? "" : "/",
4950 	    te->name) == -1)
4951 		return got_error_from_errno("asprintf");
4952 
4953 	TAILQ_FOREACH(pe, commitable_paths, entry) {
4954 		struct got_commitable *ct = pe->data;
4955 		*modified = got_path_is_child(ct->in_repo_path, te_path,
4956 		    strlen(te_path));
4957 		 if (*modified)
4958 			break;
4959 	}
4960 
4961 	free(te_path);
4962 	return err;
4963 }
4964 
4965 static const struct got_error *
4966 match_deleted_or_modified_ct(struct got_commitable **ctp,
4967     struct got_tree_entry *te, const char *base_tree_path,
4968     struct got_pathlist_head *commitable_paths)
4969 {
4970 	const struct got_error *err = NULL;
4971 	struct got_pathlist_entry *pe;
4972 
4973 	*ctp = NULL;
4974 
4975 	TAILQ_FOREACH(pe, commitable_paths, entry) {
4976 		struct got_commitable *ct = pe->data;
4977 		char *ct_name = NULL;
4978 		int path_matches;
4979 
4980 		if (ct->staged_status == GOT_STATUS_NO_CHANGE) {
4981 			if (ct->status != GOT_STATUS_MODIFY &&
4982 			    ct->status != GOT_STATUS_MODE_CHANGE &&
4983 			    ct->status != GOT_STATUS_DELETE)
4984 				continue;
4985 		} else {
4986 			if (ct->staged_status != GOT_STATUS_MODIFY &&
4987 			    ct->staged_status != GOT_STATUS_DELETE)
4988 				continue;
4989 		}
4990 
4991 		if (got_object_id_cmp(ct->base_blob_id, &te->id) != 0)
4992 			continue;
4993 
4994 		 err = match_ct_parent_path(&path_matches, ct, base_tree_path);
4995 		 if (err)
4996 			return err;
4997 		if (!path_matches)
4998 			continue;
4999 
5000 		ct_name = basename(pe->path);
5001 		if (ct_name == NULL)
5002 			return got_error_from_errno2("basename", pe->path);
5003 
5004 		if (strcmp(te->name, ct_name) != 0)
5005 			continue;
5006 
5007 		*ctp = ct;
5008 		break;
5009 	}
5010 
5011 	return err;
5012 }
5013 
5014 static const struct got_error *
5015 make_subtree_for_added_blob(struct got_tree_entry **new_tep,
5016     const char *child_path, const char *path_base_tree,
5017     struct got_pathlist_head *commitable_paths,
5018     got_worktree_status_cb status_cb, void *status_arg,
5019     struct got_repository *repo)
5020 {
5021 	const struct got_error *err = NULL;
5022 	struct got_tree_entry *new_te;
5023 	char *subtree_path;
5024 	struct got_object_id *id = NULL;
5025 	int nentries;
5026 
5027 	*new_tep = NULL;
5028 
5029 	if (asprintf(&subtree_path, "%s%s%s", path_base_tree,
5030 	    got_path_is_root_dir(path_base_tree) ? "" : "/",
5031 	    child_path) == -1)
5032 		return got_error_from_errno("asprintf");
5033 
5034 	new_te = calloc(1, sizeof(*new_te));
5035 	if (new_te == NULL)
5036 		return got_error_from_errno("calloc");
5037 	new_te->mode = S_IFDIR;
5038 
5039 	if (strlcpy(new_te->name, child_path, sizeof(new_te->name)) >=
5040 	    sizeof(new_te->name)) {
5041 		err = got_error(GOT_ERR_NO_SPACE);
5042 		goto done;
5043 	}
5044 	err = write_tree(&id, &nentries, NULL, subtree_path,
5045 	    commitable_paths, status_cb, status_arg, repo);
5046 	if (err) {
5047 		free(new_te);
5048 		goto done;
5049 	}
5050 	memcpy(&new_te->id, id, sizeof(new_te->id));
5051 done:
5052 	free(id);
5053 	free(subtree_path);
5054 	if (err == NULL)
5055 		*new_tep = new_te;
5056 	return err;
5057 }
5058 
5059 static const struct got_error *
5060 write_tree(struct got_object_id **new_tree_id, int *nentries,
5061     struct got_tree_object *base_tree, const char *path_base_tree,
5062     struct got_pathlist_head *commitable_paths,
5063     got_worktree_status_cb status_cb, void *status_arg,
5064     struct got_repository *repo)
5065 {
5066 	const struct got_error *err = NULL;
5067 	struct got_pathlist_head paths;
5068 	struct got_tree_entry *te, *new_te = NULL;
5069 	struct got_pathlist_entry *pe;
5070 
5071 	TAILQ_INIT(&paths);
5072 	*nentries = 0;
5073 
5074 	/* Insert, and recurse into, newly added entries first. */
5075 	TAILQ_FOREACH(pe, commitable_paths, entry) {
5076 		struct got_commitable *ct = pe->data;
5077 		char *child_path = NULL, *slash;
5078 
5079 		if ((ct->status != GOT_STATUS_ADD &&
5080 		    ct->staged_status != GOT_STATUS_ADD) ||
5081 		    (ct->flags & GOT_COMMITABLE_ADDED))
5082 			continue;
5083 
5084 		 if (!got_path_is_child(ct->in_repo_path, path_base_tree,
5085 		     strlen(path_base_tree)))
5086 			continue;
5087 
5088 		err = got_path_skip_common_ancestor(&child_path, path_base_tree,
5089 		    ct->in_repo_path);
5090 		if (err)
5091 			goto done;
5092 
5093 		slash = strchr(child_path, '/');
5094 		if (slash == NULL) {
5095 			err = alloc_added_blob_tree_entry(&new_te, ct);
5096 			if (err)
5097 				goto done;
5098 			err = report_ct_status(ct, status_cb, status_arg);
5099 			if (err)
5100 				goto done;
5101 			ct->flags |= GOT_COMMITABLE_ADDED;
5102 			err = insert_tree_entry(new_te, &paths);
5103 			if (err)
5104 				goto done;
5105 			(*nentries)++;
5106 		} else {
5107 			*slash = '\0'; /* trim trailing path components */
5108 			if (base_tree == NULL ||
5109 			    got_object_tree_find_entry(base_tree, child_path)
5110 			    == NULL) {
5111 				err = make_subtree_for_added_blob(&new_te,
5112 				    child_path, path_base_tree,
5113 				    commitable_paths, status_cb, status_arg,
5114 				    repo);
5115 				if (err)
5116 					goto done;
5117 				err = insert_tree_entry(new_te, &paths);
5118 				if (err)
5119 					goto done;
5120 				(*nentries)++;
5121 			}
5122 		}
5123 	}
5124 
5125 	if (base_tree) {
5126 		int i, nbase_entries;
5127 		/* Handle modified and deleted entries. */
5128 		nbase_entries = got_object_tree_get_nentries(base_tree);
5129 		for (i = 0; i < nbase_entries; i++) {
5130 			struct got_commitable *ct = NULL;
5131 
5132 			te = got_object_tree_get_entry(base_tree, i);
5133 			if (got_object_tree_entry_is_submodule(te)) {
5134 				/* Entry is a submodule; just copy it. */
5135 				err = got_object_tree_entry_dup(&new_te, te);
5136 				if (err)
5137 					goto done;
5138 				err = insert_tree_entry(new_te, &paths);
5139 				if (err)
5140 					goto done;
5141 				(*nentries)++;
5142 				continue;
5143 			}
5144 
5145 			if (S_ISDIR(te->mode)) {
5146 				int modified;
5147 				err = got_object_tree_entry_dup(&new_te, te);
5148 				if (err)
5149 					goto done;
5150 				err = match_modified_subtree(&modified, te,
5151 				    path_base_tree, commitable_paths);
5152 				if (err)
5153 					goto done;
5154 				/* Avoid recursion into unmodified subtrees. */
5155 				if (modified) {
5156 					struct got_object_id *new_id;
5157 					int nsubentries;
5158 					err = write_subtree(&new_id,
5159 					    &nsubentries, te,
5160 					    path_base_tree, commitable_paths,
5161 					    status_cb, status_arg, repo);
5162 					if (err)
5163 						goto done;
5164 					if (nsubentries == 0) {
5165 						/* All entries were deleted. */
5166 						free(new_id);
5167 						continue;
5168 					}
5169 					memcpy(&new_te->id, new_id,
5170 					    sizeof(new_te->id));
5171 					free(new_id);
5172 				}
5173 				err = insert_tree_entry(new_te, &paths);
5174 				if (err)
5175 					goto done;
5176 				(*nentries)++;
5177 				continue;
5178 			}
5179 
5180 			err = match_deleted_or_modified_ct(&ct, te,
5181 			    path_base_tree, commitable_paths);
5182 			if (err)
5183 				goto done;
5184 			if (ct) {
5185 				/* NB: Deleted entries get dropped here. */
5186 				if (ct->status == GOT_STATUS_MODIFY ||
5187 				    ct->status == GOT_STATUS_MODE_CHANGE ||
5188 				    ct->staged_status == GOT_STATUS_MODIFY) {
5189 					err = alloc_modified_blob_tree_entry(
5190 					    &new_te, te, ct);
5191 					if (err)
5192 						goto done;
5193 					err = insert_tree_entry(new_te, &paths);
5194 					if (err)
5195 						goto done;
5196 					(*nentries)++;
5197 				}
5198 				err = report_ct_status(ct, status_cb,
5199 				    status_arg);
5200 				if (err)
5201 					goto done;
5202 			} else {
5203 				/* Entry is unchanged; just copy it. */
5204 				err = got_object_tree_entry_dup(&new_te, te);
5205 				if (err)
5206 					goto done;
5207 				err = insert_tree_entry(new_te, &paths);
5208 				if (err)
5209 					goto done;
5210 				(*nentries)++;
5211 			}
5212 		}
5213 	}
5214 
5215 	/* Write new list of entries; deleted entries have been dropped. */
5216 	err = got_object_tree_create(new_tree_id, &paths, *nentries, repo);
5217 done:
5218 	got_pathlist_free(&paths);
5219 	return err;
5220 }
5221 
5222 static const struct got_error *
5223 update_fileindex_after_commit(struct got_pathlist_head *commitable_paths,
5224     struct got_object_id *new_base_commit_id, struct got_fileindex *fileindex,
5225     int have_staged_files)
5226 {
5227 	const struct got_error *err = NULL;
5228 	struct got_pathlist_entry *pe;
5229 
5230 	TAILQ_FOREACH(pe, commitable_paths, entry) {
5231 		struct got_fileindex_entry *ie;
5232 		struct got_commitable *ct = pe->data;
5233 
5234 		ie = got_fileindex_entry_get(fileindex, pe->path, pe->path_len);
5235 		if (ie) {
5236 			if (ct->status == GOT_STATUS_DELETE ||
5237 			    ct->staged_status == GOT_STATUS_DELETE) {
5238 				got_fileindex_entry_remove(fileindex, ie);
5239 			} else if (ct->staged_status == GOT_STATUS_ADD ||
5240 			    ct->staged_status == GOT_STATUS_MODIFY) {
5241 				got_fileindex_entry_stage_set(ie,
5242 				    GOT_FILEIDX_STAGE_NONE);
5243 				err = got_fileindex_entry_update(ie,
5244 				    ct->ondisk_path, ct->staged_blob_id->sha1,
5245 				    new_base_commit_id->sha1,
5246 				    !have_staged_files);
5247 			} else
5248 				err = got_fileindex_entry_update(ie,
5249 				    ct->ondisk_path, ct->blob_id->sha1,
5250 				    new_base_commit_id->sha1,
5251 				    !have_staged_files);
5252 		} else {
5253 			err = got_fileindex_entry_alloc(&ie, pe->path);
5254 			if (err)
5255 				break;
5256 			err = got_fileindex_entry_update(ie, ct->ondisk_path,
5257 			    ct->blob_id->sha1, new_base_commit_id->sha1, 1);
5258 			if (err) {
5259 				got_fileindex_entry_free(ie);
5260 				break;
5261 			}
5262 			err = got_fileindex_entry_add(fileindex, ie);
5263 			if (err) {
5264 				got_fileindex_entry_free(ie);
5265 				break;
5266 			}
5267 		}
5268 	}
5269 	return err;
5270 }
5271 
5272 
5273 static const struct got_error *
5274 check_out_of_date(const char *in_repo_path, unsigned char status,
5275     unsigned char staged_status, struct got_object_id *base_blob_id,
5276     struct got_object_id *base_commit_id,
5277     struct got_object_id *head_commit_id, struct got_repository *repo,
5278     int ood_errcode)
5279 {
5280 	const struct got_error *err = NULL;
5281 	struct got_object_id *id = NULL;
5282 
5283 	if (status != GOT_STATUS_ADD && staged_status != GOT_STATUS_ADD) {
5284 		/* Trivial case: base commit == head commit */
5285 		if (got_object_id_cmp(base_commit_id, head_commit_id) == 0)
5286 			return NULL;
5287 		/*
5288 		 * Ensure file content which local changes were based
5289 		 * on matches file content in the branch head.
5290 		 */
5291 		err = got_object_id_by_path(&id, repo, head_commit_id,
5292 		    in_repo_path);
5293 		if (err) {
5294 			if (err->code == GOT_ERR_NO_TREE_ENTRY)
5295 				err = got_error(ood_errcode);
5296 			goto done;
5297 		} else if (got_object_id_cmp(id, base_blob_id) != 0)
5298 			err = got_error(ood_errcode);
5299 	} else {
5300 		/* Require that added files don't exist in the branch head. */
5301 		err = got_object_id_by_path(&id, repo, head_commit_id,
5302 		    in_repo_path);
5303 		if (err && err->code != GOT_ERR_NO_TREE_ENTRY)
5304 			goto done;
5305 		err = id ? got_error(ood_errcode) : NULL;
5306 	}
5307 done:
5308 	free(id);
5309 	return err;
5310 }
5311 
5312 const struct got_error *
5313 commit_worktree(struct got_object_id **new_commit_id,
5314     struct got_pathlist_head *commitable_paths,
5315     struct got_object_id *head_commit_id, struct got_worktree *worktree,
5316     const char *author, const char *committer,
5317     got_worktree_commit_msg_cb commit_msg_cb, void *commit_arg,
5318     got_worktree_status_cb status_cb, void *status_arg,
5319     struct got_repository *repo)
5320 {
5321 	const struct got_error *err = NULL, *unlockerr = NULL;
5322 	struct got_pathlist_entry *pe;
5323 	const char *head_ref_name = NULL;
5324 	struct got_commit_object *head_commit = NULL;
5325 	struct got_reference *head_ref2 = NULL;
5326 	struct got_object_id *head_commit_id2 = NULL;
5327 	struct got_tree_object *head_tree = NULL;
5328 	struct got_object_id *new_tree_id = NULL;
5329 	int nentries;
5330 	struct got_object_id_queue parent_ids;
5331 	struct got_object_qid *pid = NULL;
5332 	char *logmsg = NULL;
5333 
5334 	*new_commit_id = NULL;
5335 
5336 	SIMPLEQ_INIT(&parent_ids);
5337 
5338 	err = got_object_open_as_commit(&head_commit, repo, head_commit_id);
5339 	if (err)
5340 		goto done;
5341 
5342 	err = got_object_open_as_tree(&head_tree, repo, head_commit->tree_id);
5343 	if (err)
5344 		goto done;
5345 
5346 	if (commit_msg_cb != NULL) {
5347 		err = commit_msg_cb(commitable_paths, &logmsg, commit_arg);
5348 		if (err)
5349 			goto done;
5350 	}
5351 
5352 	if (logmsg == NULL || strlen(logmsg) == 0) {
5353 		err = got_error(GOT_ERR_COMMIT_MSG_EMPTY);
5354 		goto done;
5355 	}
5356 
5357 	/* Create blobs from added and modified files and record their IDs. */
5358 	TAILQ_FOREACH(pe, commitable_paths, entry) {
5359 		struct got_commitable *ct = pe->data;
5360 		char *ondisk_path;
5361 
5362 		/* Blobs for staged files already exist. */
5363 		if (ct->staged_status == GOT_STATUS_ADD ||
5364 		    ct->staged_status == GOT_STATUS_MODIFY)
5365 			continue;
5366 
5367 		if (ct->status != GOT_STATUS_ADD &&
5368 		    ct->status != GOT_STATUS_MODIFY &&
5369 		    ct->status != GOT_STATUS_MODE_CHANGE)
5370 			continue;
5371 
5372 		if (asprintf(&ondisk_path, "%s/%s",
5373 		    worktree->root_path, pe->path) == -1) {
5374 			err = got_error_from_errno("asprintf");
5375 			goto done;
5376 		}
5377 		err = got_object_blob_create(&ct->blob_id, ondisk_path, repo);
5378 		free(ondisk_path);
5379 		if (err)
5380 			goto done;
5381 	}
5382 
5383 	/* Recursively write new tree objects. */
5384 	err = write_tree(&new_tree_id, &nentries, head_tree, "/",
5385 	    commitable_paths, status_cb, status_arg, repo);
5386 	if (err)
5387 		goto done;
5388 
5389 	err = got_object_qid_alloc(&pid, worktree->base_commit_id);
5390 	if (err)
5391 		goto done;
5392 	SIMPLEQ_INSERT_TAIL(&parent_ids, pid, entry);
5393 	err = got_object_commit_create(new_commit_id, new_tree_id, &parent_ids,
5394 	    1, author, time(NULL), committer, time(NULL), logmsg, repo);
5395 	got_object_qid_free(pid);
5396 	if (logmsg != NULL)
5397 		free(logmsg);
5398 	if (err)
5399 		goto done;
5400 
5401 	/* Check if a concurrent commit to our branch has occurred. */
5402 	head_ref_name = got_worktree_get_head_ref_name(worktree);
5403 	if (head_ref_name == NULL) {
5404 		err = got_error_from_errno("got_worktree_get_head_ref_name");
5405 		goto done;
5406 	}
5407 	/* Lock the reference here to prevent concurrent modification. */
5408 	err = got_ref_open(&head_ref2, repo, head_ref_name, 1);
5409 	if (err)
5410 		goto done;
5411 	err = got_ref_resolve(&head_commit_id2, repo, head_ref2);
5412 	if (err)
5413 		goto done;
5414 	if (got_object_id_cmp(head_commit_id, head_commit_id2) != 0) {
5415 		err = got_error(GOT_ERR_COMMIT_HEAD_CHANGED);
5416 		goto done;
5417 	}
5418 	/* Update branch head in repository. */
5419 	err = got_ref_change_ref(head_ref2, *new_commit_id);
5420 	if (err)
5421 		goto done;
5422 	err = got_ref_write(head_ref2, repo);
5423 	if (err)
5424 		goto done;
5425 
5426 	err = got_worktree_set_base_commit_id(worktree, repo, *new_commit_id);
5427 	if (err)
5428 		goto done;
5429 
5430 	err = ref_base_commit(worktree, repo);
5431 	if (err)
5432 		goto done;
5433 done:
5434 	if (head_tree)
5435 		got_object_tree_close(head_tree);
5436 	if (head_commit)
5437 		got_object_commit_close(head_commit);
5438 	free(head_commit_id2);
5439 	if (head_ref2) {
5440 		unlockerr = got_ref_unlock(head_ref2);
5441 		if (unlockerr && err == NULL)
5442 			err = unlockerr;
5443 		got_ref_close(head_ref2);
5444 	}
5445 	return err;
5446 }
5447 
5448 static const struct got_error *
5449 check_path_is_commitable(const char *path,
5450     struct got_pathlist_head *commitable_paths)
5451 {
5452 	struct got_pathlist_entry *cpe = NULL;
5453 	size_t path_len = strlen(path);
5454 
5455 	TAILQ_FOREACH(cpe, commitable_paths, entry) {
5456 		struct got_commitable *ct = cpe->data;
5457 		const char *ct_path = ct->path;
5458 
5459 		while (ct_path[0] == '/')
5460 			ct_path++;
5461 
5462 		if (strcmp(path, ct_path) == 0 ||
5463 		    got_path_is_child(ct_path, path, path_len))
5464 			break;
5465 	}
5466 
5467 	if (cpe == NULL)
5468 		return got_error_path(path, GOT_ERR_BAD_PATH);
5469 
5470 	return NULL;
5471 }
5472 
5473 static const struct got_error *
5474 check_staged_file(void *arg, struct got_fileindex_entry *ie)
5475 {
5476 	int *have_staged_files = arg;
5477 
5478 	if (got_fileindex_entry_stage_get(ie) != GOT_FILEIDX_STAGE_NONE) {
5479 		*have_staged_files = 1;
5480 		return got_error(GOT_ERR_CANCELLED);
5481 	}
5482 
5483 	return NULL;
5484 }
5485 
5486 static const struct got_error *
5487 check_non_staged_files(struct got_fileindex *fileindex,
5488     struct got_pathlist_head *paths)
5489 {
5490 	struct got_pathlist_entry *pe;
5491 	struct got_fileindex_entry *ie;
5492 
5493 	TAILQ_FOREACH(pe, paths, entry) {
5494 		if (pe->path[0] == '\0')
5495 			continue;
5496 		ie = got_fileindex_entry_get(fileindex, pe->path, pe->path_len);
5497 		if (ie == NULL)
5498 			return got_error_path(pe->path, GOT_ERR_BAD_PATH);
5499 		if (got_fileindex_entry_stage_get(ie) == GOT_FILEIDX_STAGE_NONE)
5500 			return got_error_path(pe->path,
5501 			    GOT_ERR_FILE_NOT_STAGED);
5502 	}
5503 
5504 	return NULL;
5505 }
5506 
5507 const struct got_error *
5508 got_worktree_commit(struct got_object_id **new_commit_id,
5509     struct got_worktree *worktree, struct got_pathlist_head *paths,
5510     const char *author, const char *committer, int allow_bad_symlinks,
5511     got_worktree_commit_msg_cb commit_msg_cb, void *commit_arg,
5512     got_worktree_status_cb status_cb, void *status_arg,
5513     struct got_repository *repo)
5514 {
5515 	const struct got_error *err = NULL, *unlockerr = NULL, *sync_err;
5516 	struct got_fileindex *fileindex = NULL;
5517 	char *fileindex_path = NULL;
5518 	struct got_pathlist_head commitable_paths;
5519 	struct collect_commitables_arg cc_arg;
5520 	struct got_pathlist_entry *pe;
5521 	struct got_reference *head_ref = NULL;
5522 	struct got_object_id *head_commit_id = NULL;
5523 	int have_staged_files = 0;
5524 
5525 	*new_commit_id = NULL;
5526 
5527 	TAILQ_INIT(&commitable_paths);
5528 
5529 	err = lock_worktree(worktree, LOCK_EX);
5530 	if (err)
5531 		goto done;
5532 
5533 	err = got_ref_open(&head_ref, repo, worktree->head_ref_name, 0);
5534 	if (err)
5535 		goto done;
5536 
5537 	err = got_ref_resolve(&head_commit_id, repo, head_ref);
5538 	if (err)
5539 		goto done;
5540 
5541 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
5542 	if (err)
5543 		goto done;
5544 
5545 	err = got_fileindex_for_each_entry_safe(fileindex, check_staged_file,
5546 	    &have_staged_files);
5547 	if (err && err->code != GOT_ERR_CANCELLED)
5548 		goto done;
5549 	if (have_staged_files) {
5550 		err = check_non_staged_files(fileindex, paths);
5551 		if (err)
5552 			goto done;
5553 	}
5554 
5555 	cc_arg.commitable_paths = &commitable_paths;
5556 	cc_arg.worktree = worktree;
5557 	cc_arg.fileindex = fileindex;
5558 	cc_arg.repo = repo;
5559 	cc_arg.have_staged_files = have_staged_files;
5560 	cc_arg.allow_bad_symlinks = allow_bad_symlinks;
5561 	TAILQ_FOREACH(pe, paths, entry) {
5562 		err = worktree_status(worktree, pe->path, fileindex, repo,
5563 		    collect_commitables, &cc_arg, NULL, NULL, 0, 0);
5564 		if (err)
5565 			goto done;
5566 	}
5567 
5568 	if (TAILQ_EMPTY(&commitable_paths)) {
5569 		err = got_error(GOT_ERR_COMMIT_NO_CHANGES);
5570 		goto done;
5571 	}
5572 
5573 	TAILQ_FOREACH(pe, paths, entry) {
5574 		err = check_path_is_commitable(pe->path, &commitable_paths);
5575 		if (err)
5576 			goto done;
5577 	}
5578 
5579 	TAILQ_FOREACH(pe, &commitable_paths, entry) {
5580 		struct got_commitable *ct = pe->data;
5581 		const char *ct_path = ct->in_repo_path;
5582 
5583 		while (ct_path[0] == '/')
5584 			ct_path++;
5585 		err = check_out_of_date(ct_path, ct->status,
5586 		    ct->staged_status, ct->base_blob_id, ct->base_commit_id,
5587 		    head_commit_id, repo, GOT_ERR_COMMIT_OUT_OF_DATE);
5588 		if (err)
5589 			goto done;
5590 
5591 	}
5592 
5593 	err = commit_worktree(new_commit_id, &commitable_paths,
5594 	    head_commit_id, worktree, author, committer,
5595 	    commit_msg_cb, commit_arg, status_cb, status_arg, repo);
5596 	if (err)
5597 		goto done;
5598 
5599 	err = update_fileindex_after_commit(&commitable_paths, *new_commit_id,
5600 	    fileindex, have_staged_files);
5601 	sync_err = sync_fileindex(fileindex, fileindex_path);
5602 	if (sync_err && err == NULL)
5603 		err = sync_err;
5604 done:
5605 	if (fileindex)
5606 		got_fileindex_free(fileindex);
5607 	free(fileindex_path);
5608 	unlockerr = lock_worktree(worktree, LOCK_SH);
5609 	if (unlockerr && err == NULL)
5610 		err = unlockerr;
5611 	TAILQ_FOREACH(pe, &commitable_paths, entry) {
5612 		struct got_commitable *ct = pe->data;
5613 		free_commitable(ct);
5614 	}
5615 	got_pathlist_free(&commitable_paths);
5616 	return err;
5617 }
5618 
5619 const char *
5620 got_commitable_get_path(struct got_commitable *ct)
5621 {
5622 	return ct->path;
5623 }
5624 
5625 unsigned int
5626 got_commitable_get_status(struct got_commitable *ct)
5627 {
5628 	return ct->status;
5629 }
5630 
5631 struct check_rebase_ok_arg {
5632 	struct got_worktree *worktree;
5633 	struct got_repository *repo;
5634 };
5635 
5636 static const struct got_error *
5637 check_rebase_ok(void *arg, struct got_fileindex_entry *ie)
5638 {
5639 	const struct got_error *err = NULL;
5640 	struct check_rebase_ok_arg *a = arg;
5641 	unsigned char status;
5642 	struct stat sb;
5643 	char *ondisk_path;
5644 
5645 	/* Reject rebase of a work tree with mixed base commits. */
5646 	if (memcmp(ie->commit_sha1, a->worktree->base_commit_id->sha1,
5647 	    SHA1_DIGEST_LENGTH))
5648 		return got_error(GOT_ERR_MIXED_COMMITS);
5649 
5650 	if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path, ie->path)
5651 	    == -1)
5652 		return got_error_from_errno("asprintf");
5653 
5654 	/* Reject rebase of a work tree with modified or staged files. */
5655 	err = get_file_status(&status, &sb, ie, ondisk_path, -1, NULL, a->repo);
5656 	free(ondisk_path);
5657 	if (err)
5658 		return err;
5659 
5660 	if (status != GOT_STATUS_NO_CHANGE)
5661 		return got_error(GOT_ERR_MODIFIED);
5662 	if (get_staged_status(ie) != GOT_STATUS_NO_CHANGE)
5663 		return got_error_path(ie->path, GOT_ERR_FILE_STAGED);
5664 
5665 	return NULL;
5666 }
5667 
5668 const struct got_error *
5669 got_worktree_rebase_prepare(struct got_reference **new_base_branch_ref,
5670     struct got_reference **tmp_branch, struct got_fileindex **fileindex,
5671     struct got_worktree *worktree, struct got_reference *branch,
5672     struct got_repository *repo)
5673 {
5674 	const struct got_error *err = NULL;
5675 	char *tmp_branch_name = NULL, *new_base_branch_ref_name = NULL;
5676 	char *branch_ref_name = NULL;
5677 	char *fileindex_path = NULL;
5678 	struct check_rebase_ok_arg ok_arg;
5679 	struct got_reference *wt_branch = NULL, *branch_ref = NULL;
5680 	struct got_object_id *wt_branch_tip = NULL;
5681 
5682 	*new_base_branch_ref = NULL;
5683 	*tmp_branch = NULL;
5684 	*fileindex = NULL;
5685 
5686 	err = lock_worktree(worktree, LOCK_EX);
5687 	if (err)
5688 		return err;
5689 
5690 	err = open_fileindex(fileindex, &fileindex_path, worktree);
5691 	if (err)
5692 		goto done;
5693 
5694 	ok_arg.worktree = worktree;
5695 	ok_arg.repo = repo;
5696 	err = got_fileindex_for_each_entry_safe(*fileindex, check_rebase_ok,
5697 	    &ok_arg);
5698 	if (err)
5699 		goto done;
5700 
5701 	err = get_rebase_tmp_ref_name(&tmp_branch_name, worktree);
5702 	if (err)
5703 		goto done;
5704 
5705 	err = get_newbase_symref_name(&new_base_branch_ref_name, worktree);
5706 	if (err)
5707 		goto done;
5708 
5709 	err = get_rebase_branch_symref_name(&branch_ref_name, worktree);
5710 	if (err)
5711 		goto done;
5712 
5713 	err = got_ref_open(&wt_branch, repo, worktree->head_ref_name,
5714 	    0);
5715 	if (err)
5716 		goto done;
5717 
5718 	err = got_ref_resolve(&wt_branch_tip, repo, wt_branch);
5719 	if (err)
5720 		goto done;
5721 	if (got_object_id_cmp(worktree->base_commit_id, wt_branch_tip) != 0) {
5722 		err = got_error(GOT_ERR_REBASE_OUT_OF_DATE);
5723 		goto done;
5724 	}
5725 
5726 	err = got_ref_alloc_symref(new_base_branch_ref,
5727 	    new_base_branch_ref_name, wt_branch);
5728 	if (err)
5729 		goto done;
5730 	err = got_ref_write(*new_base_branch_ref, repo);
5731 	if (err)
5732 		goto done;
5733 
5734 	/* TODO Lock original branch's ref while rebasing? */
5735 
5736 	err = got_ref_alloc_symref(&branch_ref, branch_ref_name, branch);
5737 	if (err)
5738 		goto done;
5739 
5740 	err = got_ref_write(branch_ref, repo);
5741 	if (err)
5742 		goto done;
5743 
5744 	err = got_ref_alloc(tmp_branch, tmp_branch_name,
5745 	    worktree->base_commit_id);
5746 	if (err)
5747 		goto done;
5748 	err = got_ref_write(*tmp_branch, repo);
5749 	if (err)
5750 		goto done;
5751 
5752 	err = got_worktree_set_head_ref(worktree, *tmp_branch);
5753 	if (err)
5754 		goto done;
5755 done:
5756 	free(fileindex_path);
5757 	free(tmp_branch_name);
5758 	free(new_base_branch_ref_name);
5759 	free(branch_ref_name);
5760 	if (branch_ref)
5761 		got_ref_close(branch_ref);
5762 	if (wt_branch)
5763 		got_ref_close(wt_branch);
5764 	free(wt_branch_tip);
5765 	if (err) {
5766 		if (*new_base_branch_ref) {
5767 			got_ref_close(*new_base_branch_ref);
5768 			*new_base_branch_ref = NULL;
5769 		}
5770 		if (*tmp_branch) {
5771 			got_ref_close(*tmp_branch);
5772 			*tmp_branch = NULL;
5773 		}
5774 		if (*fileindex) {
5775 			got_fileindex_free(*fileindex);
5776 			*fileindex = NULL;
5777 		}
5778 		lock_worktree(worktree, LOCK_SH);
5779 	}
5780 	return err;
5781 }
5782 
5783 const struct got_error *
5784 got_worktree_rebase_continue(struct got_object_id **commit_id,
5785     struct got_reference **new_base_branch, struct got_reference **tmp_branch,
5786     struct got_reference **branch, struct got_fileindex **fileindex,
5787     struct got_worktree *worktree, struct got_repository *repo)
5788 {
5789 	const struct got_error *err;
5790 	char *commit_ref_name = NULL, *new_base_branch_ref_name = NULL;
5791 	char *tmp_branch_name = NULL, *branch_ref_name = NULL;
5792 	struct got_reference *commit_ref = NULL, *branch_ref = NULL;
5793 	char *fileindex_path = NULL;
5794 	int have_staged_files = 0;
5795 
5796 	*commit_id = NULL;
5797 	*new_base_branch = NULL;
5798 	*tmp_branch = NULL;
5799 	*branch = NULL;
5800 	*fileindex = NULL;
5801 
5802 	err = lock_worktree(worktree, LOCK_EX);
5803 	if (err)
5804 		return err;
5805 
5806 	err = open_fileindex(fileindex, &fileindex_path, worktree);
5807 	if (err)
5808 		goto done;
5809 
5810 	err = got_fileindex_for_each_entry_safe(*fileindex, check_staged_file,
5811 	    &have_staged_files);
5812 	if (err && err->code != GOT_ERR_CANCELLED)
5813 		goto done;
5814 	if (have_staged_files) {
5815 		err = got_error(GOT_ERR_STAGED_PATHS);
5816 		goto done;
5817 	}
5818 
5819 	err = get_rebase_tmp_ref_name(&tmp_branch_name, worktree);
5820 	if (err)
5821 		goto done;
5822 
5823 	err = get_rebase_branch_symref_name(&branch_ref_name, worktree);
5824 	if (err)
5825 		goto done;
5826 
5827 	err = get_rebase_commit_ref_name(&commit_ref_name, worktree);
5828 	if (err)
5829 		goto done;
5830 
5831 	err = get_newbase_symref_name(&new_base_branch_ref_name, worktree);
5832 	if (err)
5833 		goto done;
5834 
5835 	err = got_ref_open(&branch_ref, repo, branch_ref_name, 0);
5836 	if (err)
5837 		goto done;
5838 
5839 	err = got_ref_open(branch, repo,
5840 	    got_ref_get_symref_target(branch_ref), 0);
5841 	if (err)
5842 		goto done;
5843 
5844 	err = got_ref_open(&commit_ref, repo, commit_ref_name, 0);
5845 	if (err)
5846 		goto done;
5847 
5848 	err = got_ref_resolve(commit_id, repo, commit_ref);
5849 	if (err)
5850 		goto done;
5851 
5852 	err = got_ref_open(new_base_branch, repo,
5853 	    new_base_branch_ref_name, 0);
5854 	if (err)
5855 		goto done;
5856 
5857 	err = got_ref_open(tmp_branch, repo, tmp_branch_name, 0);
5858 	if (err)
5859 		goto done;
5860 done:
5861 	free(commit_ref_name);
5862 	free(branch_ref_name);
5863 	free(fileindex_path);
5864 	if (commit_ref)
5865 		got_ref_close(commit_ref);
5866 	if (branch_ref)
5867 		got_ref_close(branch_ref);
5868 	if (err) {
5869 		free(*commit_id);
5870 		*commit_id = NULL;
5871 		if (*tmp_branch) {
5872 			got_ref_close(*tmp_branch);
5873 			*tmp_branch = NULL;
5874 		}
5875 		if (*new_base_branch) {
5876 			got_ref_close(*new_base_branch);
5877 			*new_base_branch = NULL;
5878 		}
5879 		if (*branch) {
5880 			got_ref_close(*branch);
5881 			*branch = NULL;
5882 		}
5883 		if (*fileindex) {
5884 			got_fileindex_free(*fileindex);
5885 			*fileindex = NULL;
5886 		}
5887 		lock_worktree(worktree, LOCK_SH);
5888 	}
5889 	return err;
5890 }
5891 
5892 const struct got_error *
5893 got_worktree_rebase_in_progress(int *in_progress, struct got_worktree *worktree)
5894 {
5895 	const struct got_error *err;
5896 	char *tmp_branch_name = NULL;
5897 
5898 	err = get_rebase_tmp_ref_name(&tmp_branch_name, worktree);
5899 	if (err)
5900 		return err;
5901 
5902 	*in_progress = (strcmp(tmp_branch_name, worktree->head_ref_name) == 0);
5903 	free(tmp_branch_name);
5904 	return NULL;
5905 }
5906 
5907 static const struct got_error *
5908 collect_rebase_commit_msg(struct got_pathlist_head *commitable_paths,
5909     char **logmsg, void *arg)
5910 {
5911 	*logmsg = arg;
5912 	return NULL;
5913 }
5914 
5915 static const struct got_error *
5916 rebase_status(void *arg, unsigned char status, unsigned char staged_status,
5917     const char *path, struct got_object_id *blob_id,
5918     struct got_object_id *staged_blob_id, struct got_object_id *commit_id,
5919     int dirfd, const char *de_name)
5920 {
5921 	return NULL;
5922 }
5923 
5924 struct collect_merged_paths_arg {
5925 	got_worktree_checkout_cb progress_cb;
5926 	void *progress_arg;
5927 	struct got_pathlist_head *merged_paths;
5928 };
5929 
5930 static const struct got_error *
5931 collect_merged_paths(void *arg, unsigned char status, const char *path)
5932 {
5933 	const struct got_error *err;
5934 	struct collect_merged_paths_arg *a = arg;
5935 	char *p;
5936 	struct got_pathlist_entry *new;
5937 
5938 	err = (*a->progress_cb)(a->progress_arg, status, path);
5939 	if (err)
5940 		return err;
5941 
5942 	if (status != GOT_STATUS_MERGE &&
5943 	    status != GOT_STATUS_ADD &&
5944 	    status != GOT_STATUS_DELETE &&
5945 	    status != GOT_STATUS_CONFLICT)
5946 		return NULL;
5947 
5948 	p = strdup(path);
5949 	if (p == NULL)
5950 		return got_error_from_errno("strdup");
5951 
5952 	err = got_pathlist_insert(&new, a->merged_paths, p, NULL);
5953 	if (err || new == NULL)
5954 		free(p);
5955 	return err;
5956 }
5957 
5958 void
5959 got_worktree_rebase_pathlist_free(struct got_pathlist_head *merged_paths)
5960 {
5961 	struct got_pathlist_entry *pe;
5962 
5963 	TAILQ_FOREACH(pe, merged_paths, entry)
5964 		free((char *)pe->path);
5965 
5966 	got_pathlist_free(merged_paths);
5967 }
5968 
5969 static const struct got_error *
5970 store_commit_id(const char *commit_ref_name, struct got_object_id *commit_id,
5971     int is_rebase, struct got_repository *repo)
5972 {
5973 	const struct got_error *err;
5974 	struct got_reference *commit_ref = NULL;
5975 
5976 	err = got_ref_open(&commit_ref, repo, commit_ref_name, 0);
5977 	if (err) {
5978 		if (err->code != GOT_ERR_NOT_REF)
5979 			goto done;
5980 		err = got_ref_alloc(&commit_ref, commit_ref_name, commit_id);
5981 		if (err)
5982 			goto done;
5983 		err = got_ref_write(commit_ref, repo);
5984 		if (err)
5985 			goto done;
5986 	} else if (is_rebase) {
5987 		struct got_object_id *stored_id;
5988 		int cmp;
5989 
5990 		err = got_ref_resolve(&stored_id, repo, commit_ref);
5991 		if (err)
5992 			goto done;
5993 		cmp = got_object_id_cmp(commit_id, stored_id);
5994 		free(stored_id);
5995 		if (cmp != 0) {
5996 			err = got_error(GOT_ERR_REBASE_COMMITID);
5997 			goto done;
5998 		}
5999 	}
6000 done:
6001 	if (commit_ref)
6002 		got_ref_close(commit_ref);
6003 	return err;
6004 }
6005 
6006 static const struct got_error *
6007 rebase_merge_files(struct got_pathlist_head *merged_paths,
6008     const char *commit_ref_name, struct got_worktree *worktree,
6009     struct got_fileindex *fileindex, struct got_object_id *parent_commit_id,
6010     struct got_object_id *commit_id, struct got_repository *repo,
6011     got_worktree_checkout_cb progress_cb, void *progress_arg,
6012     got_cancel_cb cancel_cb, void *cancel_arg)
6013 {
6014 	const struct got_error *err;
6015 	struct got_reference *commit_ref = NULL;
6016 	struct collect_merged_paths_arg cmp_arg;
6017 	char *fileindex_path;
6018 
6019 	/* Work tree is locked/unlocked during rebase preparation/teardown. */
6020 
6021 	err = get_fileindex_path(&fileindex_path, worktree);
6022 	if (err)
6023 		return err;
6024 
6025 	cmp_arg.progress_cb = progress_cb;
6026 	cmp_arg.progress_arg = progress_arg;
6027 	cmp_arg.merged_paths = merged_paths;
6028 	err = merge_files(worktree, fileindex, fileindex_path,
6029 	    parent_commit_id, commit_id, repo, collect_merged_paths,
6030 	    &cmp_arg, cancel_cb, cancel_arg);
6031 	if (commit_ref)
6032 		got_ref_close(commit_ref);
6033 	return err;
6034 }
6035 
6036 const struct got_error *
6037 got_worktree_rebase_merge_files(struct got_pathlist_head *merged_paths,
6038     struct got_worktree *worktree, struct got_fileindex *fileindex,
6039     struct got_object_id *parent_commit_id, struct got_object_id *commit_id,
6040     struct got_repository *repo,
6041     got_worktree_checkout_cb progress_cb, void *progress_arg,
6042     got_cancel_cb cancel_cb, void *cancel_arg)
6043 {
6044 	const struct got_error *err;
6045 	char *commit_ref_name;
6046 
6047 	err = get_rebase_commit_ref_name(&commit_ref_name, worktree);
6048 	if (err)
6049 		return err;
6050 
6051 	err = store_commit_id(commit_ref_name, commit_id, 1, repo);
6052 	if (err)
6053 		goto done;
6054 
6055 	err = rebase_merge_files(merged_paths, commit_ref_name, worktree,
6056 	    fileindex, parent_commit_id, commit_id, repo, progress_cb,
6057 	    progress_arg, cancel_cb, cancel_arg);
6058 done:
6059 	free(commit_ref_name);
6060 	return err;
6061 }
6062 
6063 const struct got_error *
6064 got_worktree_histedit_merge_files(struct got_pathlist_head *merged_paths,
6065     struct got_worktree *worktree, struct got_fileindex *fileindex,
6066     struct got_object_id *parent_commit_id, struct got_object_id *commit_id,
6067     struct got_repository *repo,
6068     got_worktree_checkout_cb progress_cb, void *progress_arg,
6069     got_cancel_cb cancel_cb, void *cancel_arg)
6070 {
6071 	const struct got_error *err;
6072 	char *commit_ref_name;
6073 
6074 	err = get_histedit_commit_ref_name(&commit_ref_name, worktree);
6075 	if (err)
6076 		return err;
6077 
6078 	err = store_commit_id(commit_ref_name, commit_id, 0, repo);
6079 	if (err)
6080 		goto done;
6081 
6082 	err = rebase_merge_files(merged_paths, commit_ref_name, worktree,
6083 	    fileindex, parent_commit_id, commit_id, repo, progress_cb,
6084 	    progress_arg, cancel_cb, cancel_arg);
6085 done:
6086 	free(commit_ref_name);
6087 	return err;
6088 }
6089 
6090 static const struct got_error *
6091 rebase_commit(struct got_object_id **new_commit_id,
6092     struct got_pathlist_head *merged_paths, struct got_reference *commit_ref,
6093     struct got_worktree *worktree, struct got_fileindex *fileindex,
6094     struct got_reference *tmp_branch, struct got_commit_object *orig_commit,
6095     const char *new_logmsg, struct got_repository *repo)
6096 {
6097 	const struct got_error *err, *sync_err;
6098 	struct got_pathlist_head commitable_paths;
6099 	struct collect_commitables_arg cc_arg;
6100 	char *fileindex_path = NULL;
6101 	struct got_reference *head_ref = NULL;
6102 	struct got_object_id *head_commit_id = NULL;
6103 	char *logmsg = NULL;
6104 
6105 	TAILQ_INIT(&commitable_paths);
6106 	*new_commit_id = NULL;
6107 
6108 	/* Work tree is locked/unlocked during rebase preparation/teardown. */
6109 
6110 	err = get_fileindex_path(&fileindex_path, worktree);
6111 	if (err)
6112 		return err;
6113 
6114 	cc_arg.commitable_paths = &commitable_paths;
6115 	cc_arg.worktree = worktree;
6116 	cc_arg.repo = repo;
6117 	cc_arg.have_staged_files = 0;
6118 	/*
6119 	 * If possible get the status of individual files directly to
6120 	 * avoid crawling the entire work tree once per rebased commit.
6121 	 * TODO: Ideally, merged_paths would contain a list of commitables
6122 	 * we could use so we could skip worktree_status() entirely.
6123 	 */
6124 	if (merged_paths) {
6125 		struct got_pathlist_entry *pe;
6126 		TAILQ_FOREACH(pe, merged_paths, entry) {
6127 			err = worktree_status(worktree, pe->path, fileindex,
6128 			    repo, collect_commitables, &cc_arg, NULL, NULL, 0,
6129 			    0);
6130 			if (err)
6131 				goto done;
6132 		}
6133 	} else {
6134 		err = worktree_status(worktree, "", fileindex, repo,
6135 		    collect_commitables, &cc_arg, NULL, NULL, 0, 0);
6136 		if (err)
6137 			goto done;
6138 	}
6139 
6140 	if (TAILQ_EMPTY(&commitable_paths)) {
6141 		/* No-op change; commit will be elided. */
6142 		err = got_ref_delete(commit_ref, repo);
6143 		if (err)
6144 			goto done;
6145 		err = got_error(GOT_ERR_COMMIT_NO_CHANGES);
6146 		goto done;
6147 	}
6148 
6149 	err = got_ref_open(&head_ref, repo, worktree->head_ref_name, 0);
6150 	if (err)
6151 		goto done;
6152 
6153 	err = got_ref_resolve(&head_commit_id, repo, head_ref);
6154 	if (err)
6155 		goto done;
6156 
6157 	if (new_logmsg) {
6158 		logmsg = strdup(new_logmsg);
6159 		if (logmsg == NULL) {
6160 			err = got_error_from_errno("strdup");
6161 			goto done;
6162 		}
6163 	} else {
6164 		err = got_object_commit_get_logmsg(&logmsg, orig_commit);
6165 		if (err)
6166 			goto done;
6167 	}
6168 
6169 	/* NB: commit_worktree will call free(logmsg) */
6170 	err = commit_worktree(new_commit_id, &commitable_paths, head_commit_id,
6171 	    worktree, got_object_commit_get_author(orig_commit),
6172 	    got_object_commit_get_committer(orig_commit),
6173 	    collect_rebase_commit_msg, logmsg, rebase_status, NULL, repo);
6174 	if (err)
6175 		goto done;
6176 
6177 	err = got_ref_change_ref(tmp_branch, *new_commit_id);
6178 	if (err)
6179 		goto done;
6180 
6181 	err = got_ref_delete(commit_ref, repo);
6182 	if (err)
6183 		goto done;
6184 
6185 	err = update_fileindex_after_commit(&commitable_paths, *new_commit_id,
6186 	    fileindex, 0);
6187 	sync_err = sync_fileindex(fileindex, fileindex_path);
6188 	if (sync_err && err == NULL)
6189 		err = sync_err;
6190 done:
6191 	free(fileindex_path);
6192 	free(head_commit_id);
6193 	if (head_ref)
6194 		got_ref_close(head_ref);
6195 	if (err) {
6196 		free(*new_commit_id);
6197 		*new_commit_id = NULL;
6198 	}
6199 	return err;
6200 }
6201 
6202 const struct got_error *
6203 got_worktree_rebase_commit(struct got_object_id **new_commit_id,
6204     struct got_pathlist_head *merged_paths, struct got_worktree *worktree,
6205     struct got_fileindex *fileindex, struct got_reference *tmp_branch,
6206     struct got_commit_object *orig_commit,
6207     struct got_object_id *orig_commit_id, struct got_repository *repo)
6208 {
6209 	const struct got_error *err;
6210 	char *commit_ref_name;
6211 	struct got_reference *commit_ref = NULL;
6212 	struct got_object_id *commit_id = NULL;
6213 
6214 	err = get_rebase_commit_ref_name(&commit_ref_name, worktree);
6215 	if (err)
6216 		return err;
6217 
6218 	err = got_ref_open(&commit_ref, repo, commit_ref_name, 0);
6219 	if (err)
6220 		goto done;
6221 	err = got_ref_resolve(&commit_id, repo, commit_ref);
6222 	if (err)
6223 		goto done;
6224 	if (got_object_id_cmp(commit_id, orig_commit_id) != 0) {
6225 		err = got_error(GOT_ERR_REBASE_COMMITID);
6226 		goto done;
6227 	}
6228 
6229 	err = rebase_commit(new_commit_id, merged_paths, commit_ref,
6230 	    worktree, fileindex, tmp_branch, orig_commit, NULL, repo);
6231 done:
6232 	if (commit_ref)
6233 		got_ref_close(commit_ref);
6234 	free(commit_ref_name);
6235 	free(commit_id);
6236 	return err;
6237 }
6238 
6239 const struct got_error *
6240 got_worktree_histedit_commit(struct got_object_id **new_commit_id,
6241     struct got_pathlist_head *merged_paths, struct got_worktree *worktree,
6242     struct got_fileindex *fileindex, struct got_reference *tmp_branch,
6243     struct got_commit_object *orig_commit,
6244     struct got_object_id *orig_commit_id, const char *new_logmsg,
6245     struct got_repository *repo)
6246 {
6247 	const struct got_error *err;
6248 	char *commit_ref_name;
6249 	struct got_reference *commit_ref = NULL;
6250 
6251 	err = get_histedit_commit_ref_name(&commit_ref_name, worktree);
6252 	if (err)
6253 		return err;
6254 
6255 	err = got_ref_open(&commit_ref, repo, commit_ref_name, 0);
6256 	if (err)
6257 		goto done;
6258 
6259 	err = rebase_commit(new_commit_id, merged_paths, commit_ref,
6260 	    worktree, fileindex, tmp_branch, orig_commit, new_logmsg, repo);
6261 done:
6262 	if (commit_ref)
6263 		got_ref_close(commit_ref);
6264 	free(commit_ref_name);
6265 	return err;
6266 }
6267 
6268 const struct got_error *
6269 got_worktree_rebase_postpone(struct got_worktree *worktree,
6270     struct got_fileindex *fileindex)
6271 {
6272 	if (fileindex)
6273 		got_fileindex_free(fileindex);
6274 	return lock_worktree(worktree, LOCK_SH);
6275 }
6276 
6277 static const struct got_error *
6278 delete_ref(const char *name, struct got_repository *repo)
6279 {
6280 	const struct got_error *err;
6281 	struct got_reference *ref;
6282 
6283 	err = got_ref_open(&ref, repo, name, 0);
6284 	if (err) {
6285 		if (err->code == GOT_ERR_NOT_REF)
6286 			return NULL;
6287 		return err;
6288 	}
6289 
6290 	err = got_ref_delete(ref, repo);
6291 	got_ref_close(ref);
6292 	return err;
6293 }
6294 
6295 static const struct got_error *
6296 delete_rebase_refs(struct got_worktree *worktree, struct got_repository *repo)
6297 {
6298 	const struct got_error *err;
6299 	char *tmp_branch_name = NULL, *new_base_branch_ref_name = NULL;
6300 	char *branch_ref_name = NULL, *commit_ref_name = NULL;
6301 
6302 	err = get_rebase_tmp_ref_name(&tmp_branch_name, worktree);
6303 	if (err)
6304 		goto done;
6305 	err = delete_ref(tmp_branch_name, repo);
6306 	if (err)
6307 		goto done;
6308 
6309 	err = get_newbase_symref_name(&new_base_branch_ref_name, worktree);
6310 	if (err)
6311 		goto done;
6312 	err = delete_ref(new_base_branch_ref_name, repo);
6313 	if (err)
6314 		goto done;
6315 
6316 	err = get_rebase_branch_symref_name(&branch_ref_name, worktree);
6317 	if (err)
6318 		goto done;
6319 	err = delete_ref(branch_ref_name, repo);
6320 	if (err)
6321 		goto done;
6322 
6323 	err = get_rebase_commit_ref_name(&commit_ref_name, worktree);
6324 	if (err)
6325 		goto done;
6326 	err = delete_ref(commit_ref_name, repo);
6327 	if (err)
6328 		goto done;
6329 
6330 done:
6331 	free(tmp_branch_name);
6332 	free(new_base_branch_ref_name);
6333 	free(branch_ref_name);
6334 	free(commit_ref_name);
6335 	return err;
6336 }
6337 
6338 const struct got_error *
6339 got_worktree_rebase_complete(struct got_worktree *worktree,
6340     struct got_fileindex *fileindex, struct got_reference *new_base_branch,
6341     struct got_reference *tmp_branch, struct got_reference *rebased_branch,
6342     struct got_repository *repo)
6343 {
6344 	const struct got_error *err, *unlockerr;
6345 	struct got_object_id *new_head_commit_id = NULL;
6346 
6347 	err = got_ref_resolve(&new_head_commit_id, repo, tmp_branch);
6348 	if (err)
6349 		return err;
6350 
6351 	err = got_ref_change_ref(rebased_branch, new_head_commit_id);
6352 	if (err)
6353 		goto done;
6354 
6355 	err = got_ref_write(rebased_branch, repo);
6356 	if (err)
6357 		goto done;
6358 
6359 	err = got_worktree_set_head_ref(worktree, rebased_branch);
6360 	if (err)
6361 		goto done;
6362 
6363 	err = delete_rebase_refs(worktree, repo);
6364 done:
6365 	if (fileindex)
6366 		got_fileindex_free(fileindex);
6367 	free(new_head_commit_id);
6368 	unlockerr = lock_worktree(worktree, LOCK_SH);
6369 	if (unlockerr && err == NULL)
6370 		err = unlockerr;
6371 	return err;
6372 }
6373 
6374 const struct got_error *
6375 got_worktree_rebase_abort(struct got_worktree *worktree,
6376     struct got_fileindex *fileindex, struct got_repository *repo,
6377     struct got_reference *new_base_branch,
6378      got_worktree_checkout_cb progress_cb, void *progress_arg)
6379 {
6380 	const struct got_error *err, *unlockerr, *sync_err;
6381 	struct got_reference *resolved = NULL;
6382 	struct got_object_id *commit_id = NULL;
6383 	char *fileindex_path = NULL;
6384 	struct revert_file_args rfa;
6385 	struct got_object_id *tree_id = NULL;
6386 
6387 	err = lock_worktree(worktree, LOCK_EX);
6388 	if (err)
6389 		return err;
6390 
6391 	err = got_ref_open(&resolved, repo,
6392 	    got_ref_get_symref_target(new_base_branch), 0);
6393 	if (err)
6394 		goto done;
6395 
6396 	err = got_worktree_set_head_ref(worktree, resolved);
6397 	if (err)
6398 		goto done;
6399 
6400 	/*
6401 	 * XXX commits to the base branch could have happened while
6402 	 * we were busy rebasing; should we store the original commit ID
6403 	 * when rebase begins and read it back here?
6404 	 */
6405 	err = got_ref_resolve(&commit_id, repo, resolved);
6406 	if (err)
6407 		goto done;
6408 
6409 	err = got_worktree_set_base_commit_id(worktree, repo, commit_id);
6410 	if (err)
6411 		goto done;
6412 
6413 	err = got_object_id_by_path(&tree_id, repo,
6414 	    worktree->base_commit_id, worktree->path_prefix);
6415 	if (err)
6416 		goto done;
6417 
6418 	err = delete_rebase_refs(worktree, repo);
6419 	if (err)
6420 		goto done;
6421 
6422 	err = get_fileindex_path(&fileindex_path, worktree);
6423 	if (err)
6424 		goto done;
6425 
6426 	rfa.worktree = worktree;
6427 	rfa.fileindex = fileindex;
6428 	rfa.progress_cb = progress_cb;
6429 	rfa.progress_arg = progress_arg;
6430 	rfa.patch_cb = NULL;
6431 	rfa.patch_arg = NULL;
6432 	rfa.repo = repo;
6433 	err = worktree_status(worktree, "", fileindex, repo,
6434 	    revert_file, &rfa, NULL, NULL, 0, 0);
6435 	if (err)
6436 		goto sync;
6437 
6438 	err = checkout_files(worktree, fileindex, "", tree_id, NULL,
6439 	    repo, progress_cb, progress_arg, NULL, NULL);
6440 sync:
6441 	sync_err = sync_fileindex(fileindex, fileindex_path);
6442 	if (sync_err && err == NULL)
6443 		err = sync_err;
6444 done:
6445 	got_ref_close(resolved);
6446 	free(tree_id);
6447 	free(commit_id);
6448 	if (fileindex)
6449 		got_fileindex_free(fileindex);
6450 	free(fileindex_path);
6451 
6452 	unlockerr = lock_worktree(worktree, LOCK_SH);
6453 	if (unlockerr && err == NULL)
6454 		err = unlockerr;
6455 	return err;
6456 }
6457 
6458 const struct got_error *
6459 got_worktree_histedit_prepare(struct got_reference **tmp_branch,
6460     struct got_reference **branch_ref, struct got_object_id **base_commit_id,
6461     struct got_fileindex **fileindex, struct got_worktree *worktree,
6462     struct got_repository *repo)
6463 {
6464 	const struct got_error *err = NULL;
6465 	char *tmp_branch_name = NULL;
6466 	char *branch_ref_name = NULL;
6467 	char *base_commit_ref_name = NULL;
6468 	char *fileindex_path = NULL;
6469 	struct check_rebase_ok_arg ok_arg;
6470 	struct got_reference *wt_branch = NULL;
6471 	struct got_reference *base_commit_ref = NULL;
6472 
6473 	*tmp_branch = NULL;
6474 	*branch_ref = NULL;
6475 	*base_commit_id = NULL;
6476 	*fileindex = NULL;
6477 
6478 	err = lock_worktree(worktree, LOCK_EX);
6479 	if (err)
6480 		return err;
6481 
6482 	err = open_fileindex(fileindex, &fileindex_path, worktree);
6483 	if (err)
6484 		goto done;
6485 
6486 	ok_arg.worktree = worktree;
6487 	ok_arg.repo = repo;
6488 	err = got_fileindex_for_each_entry_safe(*fileindex, check_rebase_ok,
6489 	    &ok_arg);
6490 	if (err)
6491 		goto done;
6492 
6493 	err = get_histedit_tmp_ref_name(&tmp_branch_name, worktree);
6494 	if (err)
6495 		goto done;
6496 
6497 	err = get_histedit_branch_symref_name(&branch_ref_name, worktree);
6498 	if (err)
6499 		goto done;
6500 
6501 	err = get_histedit_base_commit_ref_name(&base_commit_ref_name,
6502 	    worktree);
6503 	if (err)
6504 		goto done;
6505 
6506 	err = got_ref_open(&wt_branch, repo, worktree->head_ref_name,
6507 	    0);
6508 	if (err)
6509 		goto done;
6510 
6511 	err = got_ref_alloc_symref(branch_ref, branch_ref_name, wt_branch);
6512 	if (err)
6513 		goto done;
6514 
6515 	err = got_ref_write(*branch_ref, repo);
6516 	if (err)
6517 		goto done;
6518 
6519 	err = got_ref_alloc(&base_commit_ref, base_commit_ref_name,
6520 	    worktree->base_commit_id);
6521 	if (err)
6522 		goto done;
6523 	err = got_ref_write(base_commit_ref, repo);
6524 	if (err)
6525 		goto done;
6526 	*base_commit_id = got_object_id_dup(worktree->base_commit_id);
6527 	if (*base_commit_id == NULL) {
6528 		err = got_error_from_errno("got_object_id_dup");
6529 		goto done;
6530 	}
6531 
6532 	err = got_ref_alloc(tmp_branch, tmp_branch_name,
6533 	    worktree->base_commit_id);
6534 	if (err)
6535 		goto done;
6536 	err = got_ref_write(*tmp_branch, repo);
6537 	if (err)
6538 		goto done;
6539 
6540 	err = got_worktree_set_head_ref(worktree, *tmp_branch);
6541 	if (err)
6542 		goto done;
6543 done:
6544 	free(fileindex_path);
6545 	free(tmp_branch_name);
6546 	free(branch_ref_name);
6547 	free(base_commit_ref_name);
6548 	if (wt_branch)
6549 		got_ref_close(wt_branch);
6550 	if (err) {
6551 		if (*branch_ref) {
6552 			got_ref_close(*branch_ref);
6553 			*branch_ref = NULL;
6554 		}
6555 		if (*tmp_branch) {
6556 			got_ref_close(*tmp_branch);
6557 			*tmp_branch = NULL;
6558 		}
6559 		free(*base_commit_id);
6560 		if (*fileindex) {
6561 			got_fileindex_free(*fileindex);
6562 			*fileindex = NULL;
6563 		}
6564 		lock_worktree(worktree, LOCK_SH);
6565 	}
6566 	return err;
6567 }
6568 
6569 const struct got_error *
6570 got_worktree_histedit_postpone(struct got_worktree *worktree,
6571     struct got_fileindex *fileindex)
6572 {
6573 	if (fileindex)
6574 		got_fileindex_free(fileindex);
6575 	return lock_worktree(worktree, LOCK_SH);
6576 }
6577 
6578 const struct got_error *
6579 got_worktree_histedit_in_progress(int *in_progress,
6580     struct got_worktree *worktree)
6581 {
6582 	const struct got_error *err;
6583 	char *tmp_branch_name = NULL;
6584 
6585 	err = get_histedit_tmp_ref_name(&tmp_branch_name, worktree);
6586 	if (err)
6587 		return err;
6588 
6589 	*in_progress = (strcmp(tmp_branch_name, worktree->head_ref_name) == 0);
6590 	free(tmp_branch_name);
6591 	return NULL;
6592 }
6593 
6594 const struct got_error *
6595 got_worktree_histedit_continue(struct got_object_id **commit_id,
6596     struct got_reference **tmp_branch, struct got_reference **branch_ref,
6597     struct got_object_id **base_commit_id, struct got_fileindex **fileindex,
6598     struct got_worktree *worktree, struct got_repository *repo)
6599 {
6600 	const struct got_error *err;
6601 	char *commit_ref_name = NULL, *base_commit_ref_name = NULL;
6602 	char *tmp_branch_name = NULL, *branch_ref_name = NULL;
6603 	struct got_reference *commit_ref = NULL;
6604 	struct got_reference *base_commit_ref = NULL;
6605 	char *fileindex_path = NULL;
6606 	int have_staged_files = 0;
6607 
6608 	*commit_id = NULL;
6609 	*tmp_branch = NULL;
6610 	*base_commit_id = NULL;
6611 	*fileindex = NULL;
6612 
6613 	err = lock_worktree(worktree, LOCK_EX);
6614 	if (err)
6615 		return err;
6616 
6617 	err = open_fileindex(fileindex, &fileindex_path, worktree);
6618 	if (err)
6619 		goto done;
6620 
6621 	err = got_fileindex_for_each_entry_safe(*fileindex, check_staged_file,
6622 	    &have_staged_files);
6623 	if (err && err->code != GOT_ERR_CANCELLED)
6624 		goto done;
6625 	if (have_staged_files) {
6626 		err = got_error(GOT_ERR_STAGED_PATHS);
6627 		goto done;
6628 	}
6629 
6630 	err = get_histedit_tmp_ref_name(&tmp_branch_name, worktree);
6631 	if (err)
6632 		goto done;
6633 
6634 	err = get_histedit_branch_symref_name(&branch_ref_name, worktree);
6635 	if (err)
6636 		goto done;
6637 
6638 	err = get_histedit_commit_ref_name(&commit_ref_name, worktree);
6639 	if (err)
6640 		goto done;
6641 
6642 	err = get_histedit_base_commit_ref_name(&base_commit_ref_name,
6643 	    worktree);
6644 	if (err)
6645 		goto done;
6646 
6647 	err = got_ref_open(branch_ref, repo, branch_ref_name, 0);
6648 	if (err)
6649 		goto done;
6650 
6651 	err = got_ref_open(&commit_ref, repo, commit_ref_name, 0);
6652 	if (err)
6653 		goto done;
6654 	err = got_ref_resolve(commit_id, repo, commit_ref);
6655 	if (err)
6656 		goto done;
6657 
6658 	err = got_ref_open(&base_commit_ref, repo, base_commit_ref_name, 0);
6659 	if (err)
6660 		goto done;
6661 	err = got_ref_resolve(base_commit_id, repo, base_commit_ref);
6662 	if (err)
6663 		goto done;
6664 
6665 	err = got_ref_open(tmp_branch, repo, tmp_branch_name, 0);
6666 	if (err)
6667 		goto done;
6668 done:
6669 	free(commit_ref_name);
6670 	free(branch_ref_name);
6671 	free(fileindex_path);
6672 	if (commit_ref)
6673 		got_ref_close(commit_ref);
6674 	if (base_commit_ref)
6675 		got_ref_close(base_commit_ref);
6676 	if (err) {
6677 		free(*commit_id);
6678 		*commit_id = NULL;
6679 		free(*base_commit_id);
6680 		*base_commit_id = NULL;
6681 		if (*tmp_branch) {
6682 			got_ref_close(*tmp_branch);
6683 			*tmp_branch = NULL;
6684 		}
6685 		if (*fileindex) {
6686 			got_fileindex_free(*fileindex);
6687 			*fileindex = NULL;
6688 		}
6689 		lock_worktree(worktree, LOCK_EX);
6690 	}
6691 	return err;
6692 }
6693 
6694 static const struct got_error *
6695 delete_histedit_refs(struct got_worktree *worktree, struct got_repository *repo)
6696 {
6697 	const struct got_error *err;
6698 	char *tmp_branch_name = NULL, *base_commit_ref_name = NULL;
6699 	char *branch_ref_name = NULL, *commit_ref_name = NULL;
6700 
6701 	err = get_histedit_tmp_ref_name(&tmp_branch_name, worktree);
6702 	if (err)
6703 		goto done;
6704 	err = delete_ref(tmp_branch_name, repo);
6705 	if (err)
6706 		goto done;
6707 
6708 	err = get_histedit_base_commit_ref_name(&base_commit_ref_name,
6709 	    worktree);
6710 	if (err)
6711 		goto done;
6712 	err = delete_ref(base_commit_ref_name, repo);
6713 	if (err)
6714 		goto done;
6715 
6716 	err = get_histedit_branch_symref_name(&branch_ref_name, worktree);
6717 	if (err)
6718 		goto done;
6719 	err = delete_ref(branch_ref_name, repo);
6720 	if (err)
6721 		goto done;
6722 
6723 	err = get_histedit_commit_ref_name(&commit_ref_name, worktree);
6724 	if (err)
6725 		goto done;
6726 	err = delete_ref(commit_ref_name, repo);
6727 	if (err)
6728 		goto done;
6729 done:
6730 	free(tmp_branch_name);
6731 	free(base_commit_ref_name);
6732 	free(branch_ref_name);
6733 	free(commit_ref_name);
6734 	return err;
6735 }
6736 
6737 const struct got_error *
6738 got_worktree_histedit_abort(struct got_worktree *worktree,
6739     struct got_fileindex *fileindex, struct got_repository *repo,
6740     struct got_reference *branch, struct got_object_id *base_commit_id,
6741     got_worktree_checkout_cb progress_cb, void *progress_arg)
6742 {
6743 	const struct got_error *err, *unlockerr, *sync_err;
6744 	struct got_reference *resolved = NULL;
6745 	char *fileindex_path = NULL;
6746 	struct got_object_id *tree_id = NULL;
6747 	struct revert_file_args rfa;
6748 
6749 	err = lock_worktree(worktree, LOCK_EX);
6750 	if (err)
6751 		return err;
6752 
6753 	err = got_ref_open(&resolved, repo,
6754 	    got_ref_get_symref_target(branch), 0);
6755 	if (err)
6756 		goto done;
6757 
6758 	err = got_worktree_set_head_ref(worktree, resolved);
6759 	if (err)
6760 		goto done;
6761 
6762 	err = got_worktree_set_base_commit_id(worktree, repo, base_commit_id);
6763 	if (err)
6764 		goto done;
6765 
6766 	err = got_object_id_by_path(&tree_id, repo, base_commit_id,
6767 	    worktree->path_prefix);
6768 	if (err)
6769 		goto done;
6770 
6771 	err = delete_histedit_refs(worktree, repo);
6772 	if (err)
6773 		goto done;
6774 
6775 	err = get_fileindex_path(&fileindex_path, worktree);
6776 	if (err)
6777 		goto done;
6778 
6779 	rfa.worktree = worktree;
6780 	rfa.fileindex = fileindex;
6781 	rfa.progress_cb = progress_cb;
6782 	rfa.progress_arg = progress_arg;
6783 	rfa.patch_cb = NULL;
6784 	rfa.patch_arg = NULL;
6785 	rfa.repo = repo;
6786 	err = worktree_status(worktree, "", fileindex, repo,
6787 	    revert_file, &rfa, NULL, NULL, 0, 0);
6788 	if (err)
6789 		goto sync;
6790 
6791 	err = checkout_files(worktree, fileindex, "", tree_id, NULL,
6792 	    repo, progress_cb, progress_arg, NULL, NULL);
6793 sync:
6794 	sync_err = sync_fileindex(fileindex, fileindex_path);
6795 	if (sync_err && err == NULL)
6796 		err = sync_err;
6797 done:
6798 	got_ref_close(resolved);
6799 	free(tree_id);
6800 	free(fileindex_path);
6801 
6802 	unlockerr = lock_worktree(worktree, LOCK_SH);
6803 	if (unlockerr && err == NULL)
6804 		err = unlockerr;
6805 	return err;
6806 }
6807 
6808 const struct got_error *
6809 got_worktree_histedit_complete(struct got_worktree *worktree,
6810     struct got_fileindex *fileindex, struct got_reference *tmp_branch,
6811     struct got_reference *edited_branch, struct got_repository *repo)
6812 {
6813 	const struct got_error *err, *unlockerr;
6814 	struct got_object_id *new_head_commit_id = NULL;
6815 	struct got_reference *resolved = NULL;
6816 
6817 	err = got_ref_resolve(&new_head_commit_id, repo, tmp_branch);
6818 	if (err)
6819 		return err;
6820 
6821 	err = got_ref_open(&resolved, repo,
6822 	    got_ref_get_symref_target(edited_branch), 0);
6823 	if (err)
6824 		goto done;
6825 
6826 	err = got_ref_change_ref(resolved, new_head_commit_id);
6827 	if (err)
6828 		goto done;
6829 
6830 	err = got_ref_write(resolved, repo);
6831 	if (err)
6832 		goto done;
6833 
6834 	err = got_worktree_set_head_ref(worktree, resolved);
6835 	if (err)
6836 		goto done;
6837 
6838 	err = delete_histedit_refs(worktree, repo);
6839 done:
6840 	if (fileindex)
6841 		got_fileindex_free(fileindex);
6842 	free(new_head_commit_id);
6843 	unlockerr = lock_worktree(worktree, LOCK_SH);
6844 	if (unlockerr && err == NULL)
6845 		err = unlockerr;
6846 	return err;
6847 }
6848 
6849 const struct got_error *
6850 got_worktree_histedit_skip_commit(struct got_worktree *worktree,
6851     struct got_object_id *commit_id, struct got_repository *repo)
6852 {
6853 	const struct got_error *err;
6854 	char *commit_ref_name;
6855 
6856 	err = get_histedit_commit_ref_name(&commit_ref_name, worktree);
6857 	if (err)
6858 		return err;
6859 
6860 	err = store_commit_id(commit_ref_name, commit_id, 0, repo);
6861 	if (err)
6862 		goto done;
6863 
6864 	err = delete_ref(commit_ref_name, repo);
6865 done:
6866 	free(commit_ref_name);
6867 	return err;
6868 }
6869 
6870 const struct got_error *
6871 got_worktree_integrate_prepare(struct got_fileindex **fileindex,
6872     struct got_reference **branch_ref, struct got_reference **base_branch_ref,
6873     struct got_worktree *worktree, const char *refname,
6874     struct got_repository *repo)
6875 {
6876 	const struct got_error *err = NULL;
6877 	char *fileindex_path = NULL;
6878 	struct check_rebase_ok_arg ok_arg;
6879 
6880 	*fileindex = NULL;
6881 	*branch_ref = NULL;
6882 	*base_branch_ref = NULL;
6883 
6884 	err = lock_worktree(worktree, LOCK_EX);
6885 	if (err)
6886 		return err;
6887 
6888 	if (strcmp(refname, got_worktree_get_head_ref_name(worktree)) == 0) {
6889 		err = got_error_msg(GOT_ERR_SAME_BRANCH,
6890 		    "cannot integrate a branch into itself; "
6891 		    "update -b or different branch name required");
6892 		goto done;
6893 	}
6894 
6895 	err = open_fileindex(fileindex, &fileindex_path, worktree);
6896 	if (err)
6897 		goto done;
6898 
6899 	/* Preconditions are the same as for rebase. */
6900 	ok_arg.worktree = worktree;
6901 	ok_arg.repo = repo;
6902 	err = got_fileindex_for_each_entry_safe(*fileindex, check_rebase_ok,
6903 	    &ok_arg);
6904 	if (err)
6905 		goto done;
6906 
6907 	err = got_ref_open(branch_ref, repo, refname, 1);
6908 	if (err)
6909 		goto done;
6910 
6911 	err = got_ref_open(base_branch_ref, repo,
6912 	    got_worktree_get_head_ref_name(worktree), 1);
6913 done:
6914 	if (err) {
6915 		if (*branch_ref) {
6916 			got_ref_close(*branch_ref);
6917 			*branch_ref = NULL;
6918 		}
6919 		if (*base_branch_ref) {
6920 			got_ref_close(*base_branch_ref);
6921 			*base_branch_ref = NULL;
6922 		}
6923 		if (*fileindex) {
6924 			got_fileindex_free(*fileindex);
6925 			*fileindex = NULL;
6926 		}
6927 		lock_worktree(worktree, LOCK_SH);
6928 	}
6929 	return err;
6930 }
6931 
6932 const struct got_error *
6933 got_worktree_integrate_continue(struct got_worktree *worktree,
6934     struct got_fileindex *fileindex, struct got_repository *repo,
6935     struct got_reference *branch_ref, struct got_reference *base_branch_ref,
6936     got_worktree_checkout_cb progress_cb, void *progress_arg,
6937     got_cancel_cb cancel_cb, void *cancel_arg)
6938 {
6939 	const struct got_error *err = NULL, *sync_err, *unlockerr;
6940 	char *fileindex_path = NULL;
6941 	struct got_object_id *tree_id = NULL, *commit_id = NULL;
6942 
6943 	err = get_fileindex_path(&fileindex_path, worktree);
6944 	if (err)
6945 		goto done;
6946 
6947 	err = got_ref_resolve(&commit_id, repo, branch_ref);
6948 	if (err)
6949 		goto done;
6950 
6951 	err = got_object_id_by_path(&tree_id, repo, commit_id,
6952 	    worktree->path_prefix);
6953 	if (err)
6954 		goto done;
6955 
6956 	err = got_worktree_set_base_commit_id(worktree, repo, commit_id);
6957 	if (err)
6958 		goto done;
6959 
6960 	err = checkout_files(worktree, fileindex, "", tree_id, NULL, repo,
6961 	    progress_cb, progress_arg, cancel_cb, cancel_arg);
6962 	if (err)
6963 		goto sync;
6964 
6965 	err = got_ref_change_ref(base_branch_ref, commit_id);
6966 	if (err)
6967 		goto sync;
6968 
6969 	err = got_ref_write(base_branch_ref, repo);
6970 sync:
6971 	sync_err = sync_fileindex(fileindex, fileindex_path);
6972 	if (sync_err && err == NULL)
6973 		err = sync_err;
6974 
6975 done:
6976 	unlockerr = got_ref_unlock(branch_ref);
6977 	if (unlockerr && err == NULL)
6978 		err = unlockerr;
6979 	got_ref_close(branch_ref);
6980 
6981 	unlockerr = got_ref_unlock(base_branch_ref);
6982 	if (unlockerr && err == NULL)
6983 		err = unlockerr;
6984 	got_ref_close(base_branch_ref);
6985 
6986 	got_fileindex_free(fileindex);
6987 	free(fileindex_path);
6988 	free(tree_id);
6989 
6990 	unlockerr = lock_worktree(worktree, LOCK_SH);
6991 	if (unlockerr && err == NULL)
6992 		err = unlockerr;
6993 	return err;
6994 }
6995 
6996 const struct got_error *
6997 got_worktree_integrate_abort(struct got_worktree *worktree,
6998     struct got_fileindex *fileindex, struct got_repository *repo,
6999     struct got_reference *branch_ref, struct got_reference *base_branch_ref)
7000 {
7001 	const struct got_error *err = NULL, *unlockerr = NULL;
7002 
7003 	got_fileindex_free(fileindex);
7004 
7005 	err = lock_worktree(worktree, LOCK_SH);
7006 
7007 	unlockerr = got_ref_unlock(branch_ref);
7008 	if (unlockerr && err == NULL)
7009 		err = unlockerr;
7010 	got_ref_close(branch_ref);
7011 
7012 	unlockerr = got_ref_unlock(base_branch_ref);
7013 	if (unlockerr && err == NULL)
7014 		err = unlockerr;
7015 	got_ref_close(base_branch_ref);
7016 
7017 	return err;
7018 }
7019 
7020 struct check_stage_ok_arg {
7021 	struct got_object_id *head_commit_id;
7022 	struct got_worktree *worktree;
7023 	struct got_fileindex *fileindex;
7024 	struct got_repository *repo;
7025 	int have_changes;
7026 };
7027 
7028 const struct got_error *
7029 check_stage_ok(void *arg, unsigned char status,
7030     unsigned char staged_status, const char *relpath,
7031     struct got_object_id *blob_id, struct got_object_id *staged_blob_id,
7032     struct got_object_id *commit_id, int dirfd, const char *de_name)
7033 {
7034 	struct check_stage_ok_arg *a = arg;
7035 	const struct got_error *err = NULL;
7036 	struct got_fileindex_entry *ie;
7037 	struct got_object_id base_commit_id;
7038 	struct got_object_id *base_commit_idp = NULL;
7039 	char *in_repo_path = NULL, *p;
7040 
7041 	if (status == GOT_STATUS_UNVERSIONED ||
7042 	    status == GOT_STATUS_NO_CHANGE)
7043 		return NULL;
7044 	if (status == GOT_STATUS_NONEXISTENT)
7045 		return got_error_set_errno(ENOENT, relpath);
7046 
7047 	ie = got_fileindex_entry_get(a->fileindex, relpath, strlen(relpath));
7048 	if (ie == NULL)
7049 		return got_error_path(relpath, GOT_ERR_FILE_STATUS);
7050 
7051 	if (asprintf(&in_repo_path, "%s%s%s", a->worktree->path_prefix,
7052 	    got_path_is_root_dir(a->worktree->path_prefix) ? "" : "/",
7053 	    relpath) == -1)
7054 		return got_error_from_errno("asprintf");
7055 
7056 	if (got_fileindex_entry_has_commit(ie)) {
7057 		memcpy(base_commit_id.sha1, ie->commit_sha1,
7058 		    SHA1_DIGEST_LENGTH);
7059 		base_commit_idp = &base_commit_id;
7060 	}
7061 
7062 	if (status == GOT_STATUS_CONFLICT) {
7063 		err = got_error_path(ie->path, GOT_ERR_STAGE_CONFLICT);
7064 		goto done;
7065 	} else if (status != GOT_STATUS_ADD &&
7066 	    status != GOT_STATUS_MODIFY &&
7067 	    status != GOT_STATUS_DELETE) {
7068 		err = got_error_path(ie->path, GOT_ERR_FILE_STATUS);
7069 		goto done;
7070 	}
7071 
7072 	a->have_changes = 1;
7073 
7074 	p = in_repo_path;
7075 	while (p[0] == '/')
7076 		p++;
7077 	err = check_out_of_date(p, status, staged_status,
7078 	    blob_id, base_commit_idp, a->head_commit_id, a->repo,
7079 	    GOT_ERR_STAGE_OUT_OF_DATE);
7080 done:
7081 	free(in_repo_path);
7082 	return err;
7083 }
7084 
7085 struct stage_path_arg {
7086 	struct got_worktree *worktree;
7087 	struct got_fileindex *fileindex;
7088 	struct got_repository *repo;
7089 	got_worktree_status_cb status_cb;
7090 	void *status_arg;
7091 	got_worktree_patch_cb patch_cb;
7092 	void *patch_arg;
7093 	int staged_something;
7094 	int allow_bad_symlinks;
7095 };
7096 
7097 static const struct got_error *
7098 stage_path(void *arg, unsigned char status,
7099     unsigned char staged_status, const char *relpath,
7100     struct got_object_id *blob_id, struct got_object_id *staged_blob_id,
7101     struct got_object_id *commit_id, int dirfd, const char *de_name)
7102 {
7103 	struct stage_path_arg *a = arg;
7104 	const struct got_error *err = NULL;
7105 	struct got_fileindex_entry *ie;
7106 	char *ondisk_path = NULL, *path_content = NULL;
7107 	uint32_t stage;
7108 	struct got_object_id *new_staged_blob_id = NULL;
7109 	struct stat sb;
7110 
7111 	if (status == GOT_STATUS_UNVERSIONED)
7112 		return NULL;
7113 
7114 	ie = got_fileindex_entry_get(a->fileindex, relpath, strlen(relpath));
7115 	if (ie == NULL)
7116 		return got_error_path(relpath, GOT_ERR_FILE_STATUS);
7117 
7118 	if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path,
7119 	    relpath)== -1)
7120 		return got_error_from_errno("asprintf");
7121 
7122 	switch (status) {
7123 	case GOT_STATUS_ADD:
7124 	case GOT_STATUS_MODIFY:
7125 		/* XXX could sb.st_mode be passed in by our caller? */
7126 		if (lstat(ondisk_path, &sb) == -1) {
7127 			err = got_error_from_errno2("lstat", ondisk_path);
7128 			break;
7129 		}
7130 		if (a->patch_cb) {
7131 			if (status == GOT_STATUS_ADD) {
7132 				int choice = GOT_PATCH_CHOICE_NONE;
7133 				err = (*a->patch_cb)(&choice, a->patch_arg,
7134 				    status, ie->path, NULL, 1, 1);
7135 				if (err)
7136 					break;
7137 				if (choice != GOT_PATCH_CHOICE_YES)
7138 					break;
7139 			} else {
7140 				err = create_patched_content(&path_content, 0,
7141 				    staged_blob_id ? staged_blob_id : blob_id,
7142 				    ondisk_path, dirfd, de_name, ie->path,
7143 				    a->repo, a->patch_cb, a->patch_arg);
7144 				if (err || path_content == NULL)
7145 					break;
7146 			}
7147 		}
7148 		err = got_object_blob_create(&new_staged_blob_id,
7149 		    path_content ? path_content : ondisk_path, a->repo);
7150 		if (err)
7151 			break;
7152 		memcpy(ie->staged_blob_sha1, new_staged_blob_id->sha1,
7153 		    SHA1_DIGEST_LENGTH);
7154 		if (status == GOT_STATUS_ADD || staged_status == GOT_STATUS_ADD)
7155 			stage = GOT_FILEIDX_STAGE_ADD;
7156 		else
7157 			stage = GOT_FILEIDX_STAGE_MODIFY;
7158 		got_fileindex_entry_stage_set(ie, stage);
7159 		if (S_ISLNK(sb.st_mode)) {
7160 			int is_bad_symlink = 0;
7161 			if (!a->allow_bad_symlinks) {
7162 				char target_path[PATH_MAX];
7163 				ssize_t target_len;
7164 				target_len = readlink(ondisk_path, target_path,
7165 				    sizeof(target_path));
7166 				if (target_len == -1) {
7167 					err = got_error_from_errno2("readlink",
7168 					    ondisk_path);
7169 					break;
7170 				}
7171 				err = is_bad_symlink_target(&is_bad_symlink,
7172 				    target_path, target_len, ondisk_path,
7173 				    a->worktree->root_path);
7174 				if (err)
7175 					break;
7176 				if (is_bad_symlink) {
7177 					err = got_error_path(ondisk_path,
7178 					    GOT_ERR_BAD_SYMLINK);
7179 					break;
7180 				}
7181 			}
7182 			if (is_bad_symlink)
7183 				got_fileindex_entry_staged_filetype_set(ie,
7184 				    GOT_FILEIDX_MODE_BAD_SYMLINK);
7185 			else
7186 				got_fileindex_entry_staged_filetype_set(ie,
7187 				    GOT_FILEIDX_MODE_SYMLINK);
7188 		} else {
7189 			got_fileindex_entry_staged_filetype_set(ie,
7190 			    GOT_FILEIDX_MODE_REGULAR_FILE);
7191 		}
7192 		a->staged_something = 1;
7193 		if (a->status_cb == NULL)
7194 			break;
7195 		err = (*a->status_cb)(a->status_arg, GOT_STATUS_NO_CHANGE,
7196 		    get_staged_status(ie), relpath, blob_id,
7197 		    new_staged_blob_id, NULL, dirfd, de_name);
7198 		break;
7199 	case GOT_STATUS_DELETE:
7200 		if (staged_status == GOT_STATUS_DELETE)
7201 			break;
7202 		if (a->patch_cb) {
7203 			int choice = GOT_PATCH_CHOICE_NONE;
7204 			err = (*a->patch_cb)(&choice, a->patch_arg, status,
7205 			    ie->path, NULL, 1, 1);
7206 			if (err)
7207 				break;
7208 			if (choice == GOT_PATCH_CHOICE_NO)
7209 				break;
7210 			if (choice != GOT_PATCH_CHOICE_YES) {
7211 				err = got_error(GOT_ERR_PATCH_CHOICE);
7212 				break;
7213 			}
7214 		}
7215 		stage = GOT_FILEIDX_STAGE_DELETE;
7216 		got_fileindex_entry_stage_set(ie, stage);
7217 		a->staged_something = 1;
7218 		if (a->status_cb == NULL)
7219 			break;
7220 		err = (*a->status_cb)(a->status_arg, GOT_STATUS_NO_CHANGE,
7221 		    get_staged_status(ie), relpath, NULL, NULL, NULL, dirfd,
7222 		    de_name);
7223 		break;
7224 	case GOT_STATUS_NO_CHANGE:
7225 		break;
7226 	case GOT_STATUS_CONFLICT:
7227 		err = got_error_path(relpath, GOT_ERR_STAGE_CONFLICT);
7228 		break;
7229 	case GOT_STATUS_NONEXISTENT:
7230 		err = got_error_set_errno(ENOENT, relpath);
7231 		break;
7232 	default:
7233 		err = got_error_path(relpath, GOT_ERR_FILE_STATUS);
7234 		break;
7235 	}
7236 
7237 	if (path_content && unlink(path_content) == -1 && err == NULL)
7238 		err = got_error_from_errno2("unlink", path_content);
7239 	free(path_content);
7240 	free(ondisk_path);
7241 	free(new_staged_blob_id);
7242 	return err;
7243 }
7244 
7245 const struct got_error *
7246 got_worktree_stage(struct got_worktree *worktree,
7247     struct got_pathlist_head *paths,
7248     got_worktree_status_cb status_cb, void *status_arg,
7249     got_worktree_patch_cb patch_cb, void *patch_arg,
7250     int allow_bad_symlinks, struct got_repository *repo)
7251 {
7252 	const struct got_error *err = NULL, *sync_err, *unlockerr;
7253 	struct got_pathlist_entry *pe;
7254 	struct got_fileindex *fileindex = NULL;
7255 	char *fileindex_path = NULL;
7256 	struct got_reference *head_ref = NULL;
7257 	struct got_object_id *head_commit_id = NULL;
7258 	struct check_stage_ok_arg oka;
7259 	struct stage_path_arg spa;
7260 
7261 	err = lock_worktree(worktree, LOCK_EX);
7262 	if (err)
7263 		return err;
7264 
7265 	err = got_ref_open(&head_ref, repo,
7266 	    got_worktree_get_head_ref_name(worktree), 0);
7267 	if (err)
7268 		goto done;
7269 	err = got_ref_resolve(&head_commit_id, repo, head_ref);
7270 	if (err)
7271 		goto done;
7272 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
7273 	if (err)
7274 		goto done;
7275 
7276 	/* Check pre-conditions before staging anything. */
7277 	oka.head_commit_id = head_commit_id;
7278 	oka.worktree = worktree;
7279 	oka.fileindex = fileindex;
7280 	oka.repo = repo;
7281 	oka.have_changes = 0;
7282 	TAILQ_FOREACH(pe, paths, entry) {
7283 		err = worktree_status(worktree, pe->path, fileindex, repo,
7284 		    check_stage_ok, &oka, NULL, NULL, 0, 0);
7285 		if (err)
7286 			goto done;
7287 	}
7288 	if (!oka.have_changes) {
7289 		err = got_error(GOT_ERR_STAGE_NO_CHANGE);
7290 		goto done;
7291 	}
7292 
7293 	spa.worktree = worktree;
7294 	spa.fileindex = fileindex;
7295 	spa.repo = repo;
7296 	spa.patch_cb = patch_cb;
7297 	spa.patch_arg = patch_arg;
7298 	spa.status_cb = status_cb;
7299 	spa.status_arg = status_arg;
7300 	spa.staged_something = 0;
7301 	spa.allow_bad_symlinks = allow_bad_symlinks;
7302 	TAILQ_FOREACH(pe, paths, entry) {
7303 		err = worktree_status(worktree, pe->path, fileindex, repo,
7304 		    stage_path, &spa, NULL, NULL, 0, 0);
7305 		if (err)
7306 			goto done;
7307 	}
7308 	if (!spa.staged_something) {
7309 		err = got_error(GOT_ERR_STAGE_NO_CHANGE);
7310 		goto done;
7311 	}
7312 
7313 	sync_err = sync_fileindex(fileindex, fileindex_path);
7314 	if (sync_err && err == NULL)
7315 		err = sync_err;
7316 done:
7317 	if (head_ref)
7318 		got_ref_close(head_ref);
7319 	free(head_commit_id);
7320 	free(fileindex_path);
7321 	if (fileindex)
7322 		got_fileindex_free(fileindex);
7323 	unlockerr = lock_worktree(worktree, LOCK_SH);
7324 	if (unlockerr && err == NULL)
7325 		err = unlockerr;
7326 	return err;
7327 }
7328 
7329 struct unstage_path_arg {
7330 	struct got_worktree *worktree;
7331 	struct got_fileindex *fileindex;
7332 	struct got_repository *repo;
7333 	got_worktree_checkout_cb progress_cb;
7334 	void *progress_arg;
7335 	got_worktree_patch_cb patch_cb;
7336 	void *patch_arg;
7337 };
7338 
7339 static const struct got_error *
7340 create_unstaged_content(char **path_unstaged_content,
7341     char **path_new_staged_content, struct got_object_id *blob_id,
7342     struct got_object_id *staged_blob_id, const char *relpath,
7343     struct got_repository *repo,
7344     got_worktree_patch_cb patch_cb, void *patch_arg)
7345 {
7346 	const struct got_error *err;
7347 	struct got_blob_object *blob = NULL, *staged_blob = NULL;
7348 	FILE *f1 = NULL, *f2 = NULL, *outfile = NULL, *rejectfile = NULL;
7349 	char *path1 = NULL, *path2 = NULL, *label1 = NULL;
7350 	struct stat sb1, sb2;
7351 	struct got_diff_changes *changes = NULL;
7352 	struct got_diff_state *ds = NULL;
7353 	struct got_diff_args *args = NULL;
7354 	struct got_diff_change *change;
7355 	int diff_flags = 0, line_cur1 = 1, line_cur2 = 1, n = 0;
7356 	int have_content = 0, have_rejected_content = 0;
7357 
7358 	*path_unstaged_content = NULL;
7359 	*path_new_staged_content = NULL;
7360 
7361 	err = got_object_id_str(&label1, blob_id);
7362 	if (err)
7363 		return err;
7364 	err = got_object_open_as_blob(&blob, repo, blob_id, 8192);
7365 	if (err)
7366 		goto done;
7367 
7368 	err = got_opentemp_named(&path1, &f1, "got-unstage-blob-base");
7369 	if (err)
7370 		goto done;
7371 
7372 	err = got_object_blob_dump_to_file(NULL, NULL, NULL, f1, blob);
7373 	if (err)
7374 		goto done;
7375 
7376 	err = got_object_open_as_blob(&staged_blob, repo, staged_blob_id, 8192);
7377 	if (err)
7378 		goto done;
7379 
7380 	err = got_opentemp_named(&path2, &f2, "got-unstage-blob-staged");
7381 	if (err)
7382 		goto done;
7383 
7384 	err = got_object_blob_dump_to_file(NULL, NULL, NULL, f2, staged_blob);
7385 	if (err)
7386 		goto done;
7387 
7388 	if (stat(path1, &sb1) == -1) {
7389 		err = got_error_from_errno2("stat", path1);
7390 		goto done;
7391 	}
7392 
7393 	if (stat(path2, &sb2) == -1) {
7394 		err = got_error_from_errno2("stat", path2);
7395 		goto done;
7396 	}
7397 
7398 	err = got_diff_files(&changes, &ds, &args, &diff_flags,
7399 	    f1, sb1.st_size, label1, f2, sb2.st_size, path2, 3, NULL);
7400 	if (err)
7401 		goto done;
7402 
7403 	err = got_opentemp_named(path_unstaged_content, &outfile,
7404 	    "got-unstaged-content");
7405 	if (err)
7406 		goto done;
7407 	err = got_opentemp_named(path_new_staged_content, &rejectfile,
7408 	    "got-new-staged-content");
7409 	if (err)
7410 		goto done;
7411 
7412 	if (fseek(f1, 0L, SEEK_SET) == -1) {
7413 		err = got_ferror(f1, GOT_ERR_IO);
7414 		goto done;
7415 	}
7416 	if (fseek(f2, 0L, SEEK_SET) == -1) {
7417 		err = got_ferror(f2, GOT_ERR_IO);
7418 		goto done;
7419 	}
7420 	SIMPLEQ_FOREACH(change, &changes->entries, entry) {
7421 		int choice;
7422 		err = apply_or_reject_change(&choice, change, ++n,
7423 		    changes->nchanges, ds, args, diff_flags, relpath,
7424 		    f1, f2, &line_cur1, &line_cur2,
7425 		    outfile, rejectfile, patch_cb, patch_arg);
7426 		if (err)
7427 			goto done;
7428 		if (choice == GOT_PATCH_CHOICE_YES)
7429 			have_content = 1;
7430 		else
7431 			have_rejected_content = 1;
7432 		if (choice == GOT_PATCH_CHOICE_QUIT)
7433 			break;
7434 	}
7435 	if (have_content || have_rejected_content)
7436 		err = copy_remaining_content(f1, f2, &line_cur1, &line_cur2,
7437 		    outfile, rejectfile);
7438 done:
7439 	free(label1);
7440 	if (blob)
7441 		got_object_blob_close(blob);
7442 	if (staged_blob)
7443 		got_object_blob_close(staged_blob);
7444 	if (f1 && fclose(f1) == EOF && err == NULL)
7445 		err = got_error_from_errno2("fclose", path1);
7446 	if (f2 && fclose(f2) == EOF && err == NULL)
7447 		err = got_error_from_errno2("fclose", path2);
7448 	if (outfile && fclose(outfile) == EOF && err == NULL)
7449 		err = got_error_from_errno2("fclose", *path_unstaged_content);
7450 	if (rejectfile && fclose(rejectfile) == EOF && err == NULL)
7451 		err = got_error_from_errno2("fclose", *path_new_staged_content);
7452 	if (path1 && unlink(path1) == -1 && err == NULL)
7453 		err = got_error_from_errno2("unlink", path1);
7454 	if (path2 && unlink(path2) == -1 && err == NULL)
7455 		err = got_error_from_errno2("unlink", path2);
7456 	if (err || !have_content) {
7457 		if (*path_unstaged_content &&
7458 		    unlink(*path_unstaged_content) == -1 && err == NULL)
7459 			err = got_error_from_errno2("unlink",
7460 			    *path_unstaged_content);
7461 		free(*path_unstaged_content);
7462 		*path_unstaged_content = NULL;
7463 	}
7464 	if (err || !have_content || !have_rejected_content) {
7465 		if (*path_new_staged_content &&
7466 		    unlink(*path_new_staged_content) == -1 && err == NULL)
7467 			err = got_error_from_errno2("unlink",
7468 			    *path_new_staged_content);
7469 		free(*path_new_staged_content);
7470 		*path_new_staged_content = NULL;
7471 	}
7472 	free(args);
7473 	if (ds) {
7474 		got_diff_state_free(ds);
7475 		free(ds);
7476 	}
7477 	if (changes)
7478 		got_diff_free_changes(changes);
7479 	free(path1);
7480 	free(path2);
7481 	return err;
7482 }
7483 
7484 static const struct got_error *
7485 unstage_hunks(struct got_object_id *staged_blob_id,
7486     struct got_blob_object *blob_base,
7487     struct got_object_id *blob_id, struct got_fileindex_entry *ie,
7488     const char *ondisk_path, const char *label_orig,
7489     struct got_worktree *worktree, struct got_repository *repo,
7490     got_worktree_patch_cb patch_cb, void *patch_arg,
7491     got_worktree_checkout_cb progress_cb, void *progress_arg)
7492 {
7493 	const struct got_error *err = NULL;
7494 	char *path_unstaged_content = NULL;
7495 	char *path_new_staged_content = NULL;
7496 	struct got_object_id *new_staged_blob_id = NULL;
7497 	FILE *f = NULL;
7498 	struct stat sb;
7499 
7500 	err = create_unstaged_content(&path_unstaged_content,
7501 	    &path_new_staged_content, blob_id, staged_blob_id,
7502 	    ie->path, repo, patch_cb, patch_arg);
7503 	if (err)
7504 		return err;
7505 
7506 	if (path_unstaged_content == NULL)
7507 		return NULL;
7508 
7509 	if (path_new_staged_content) {
7510 		err = got_object_blob_create(&new_staged_blob_id,
7511 		    path_new_staged_content, repo);
7512 		if (err)
7513 			goto done;
7514 	}
7515 
7516 	f = fopen(path_unstaged_content, "r");
7517 	if (f == NULL) {
7518 		err = got_error_from_errno2("fopen",
7519 		    path_unstaged_content);
7520 		goto done;
7521 	}
7522 	if (fstat(fileno(f), &sb) == -1) {
7523 		err = got_error_from_errno2("fstat", path_unstaged_content);
7524 		goto done;
7525 	}
7526 	if (got_fileindex_entry_staged_filetype_get(ie) ==
7527 	    GOT_FILEIDX_MODE_SYMLINK && sb.st_size < PATH_MAX) {
7528 		char link_target[PATH_MAX];
7529 		size_t r;
7530 		r = fread(link_target, 1, sizeof(link_target), f);
7531 		if (r == 0 && ferror(f)) {
7532 			err = got_error_from_errno("fread");
7533 			goto done;
7534 		}
7535 		if (r >= sizeof(link_target)) { /* should not happen */
7536 			err = got_error(GOT_ERR_NO_SPACE);
7537 			goto done;
7538 		}
7539 		link_target[r] = '\0';
7540 		err = merge_symlink(worktree, blob_base,
7541 		    ondisk_path, ie->path, label_orig, link_target,
7542 		    worktree->base_commit_id, repo, progress_cb,
7543 		    progress_arg);
7544 	} else {
7545 		int local_changes_subsumed;
7546 		err = merge_file(&local_changes_subsumed, worktree,
7547 		    blob_base, ondisk_path, ie->path,
7548 		    got_fileindex_perms_to_st(ie),
7549 		    path_unstaged_content, label_orig, "unstaged",
7550 		    repo, progress_cb, progress_arg);
7551 	}
7552 	if (err)
7553 		goto done;
7554 
7555 	if (new_staged_blob_id) {
7556 		memcpy(ie->staged_blob_sha1, new_staged_blob_id->sha1,
7557 		    SHA1_DIGEST_LENGTH);
7558 	} else
7559 		got_fileindex_entry_stage_set(ie, GOT_FILEIDX_STAGE_NONE);
7560 done:
7561 	free(new_staged_blob_id);
7562 	if (path_unstaged_content &&
7563 	    unlink(path_unstaged_content) == -1 && err == NULL)
7564 		err = got_error_from_errno2("unlink", path_unstaged_content);
7565 	if (path_new_staged_content &&
7566 	    unlink(path_new_staged_content) == -1 && err == NULL)
7567 		err = got_error_from_errno2("unlink", path_new_staged_content);
7568 	if (f && fclose(f) != 0 && err == NULL)
7569 		err = got_error_from_errno2("fclose", path_unstaged_content);
7570 	free(path_unstaged_content);
7571 	free(path_new_staged_content);
7572 	return err;
7573 }
7574 
7575 static const struct got_error *
7576 unstage_path(void *arg, unsigned char status,
7577     unsigned char staged_status, const char *relpath,
7578     struct got_object_id *blob_id, struct got_object_id *staged_blob_id,
7579     struct got_object_id *commit_id, int dirfd, const char *de_name)
7580 {
7581 	const struct got_error *err = NULL;
7582 	struct unstage_path_arg *a = arg;
7583 	struct got_fileindex_entry *ie;
7584 	struct got_blob_object *blob_base = NULL, *blob_staged = NULL;
7585 	char *ondisk_path = NULL;
7586 	char *id_str = NULL, *label_orig = NULL;
7587 	int local_changes_subsumed;
7588 	struct stat sb;
7589 
7590 	if (staged_status != GOT_STATUS_ADD &&
7591 	    staged_status != GOT_STATUS_MODIFY &&
7592 	    staged_status != GOT_STATUS_DELETE)
7593 		return NULL;
7594 
7595 	ie = got_fileindex_entry_get(a->fileindex, relpath, strlen(relpath));
7596 	if (ie == NULL)
7597 		return got_error_path(relpath, GOT_ERR_FILE_STATUS);
7598 
7599 	if (asprintf(&ondisk_path, "%s/%s", a->worktree->root_path, relpath)
7600 	    == -1)
7601 		return got_error_from_errno("asprintf");
7602 
7603 	err = got_object_id_str(&id_str,
7604 	    commit_id ? commit_id : a->worktree->base_commit_id);
7605 	if (err)
7606 		goto done;
7607 	if (asprintf(&label_orig, "%s: commit %s", GOT_MERGE_LABEL_BASE,
7608 	    id_str) == -1) {
7609 		err = got_error_from_errno("asprintf");
7610 		goto done;
7611 	}
7612 
7613 	switch (staged_status) {
7614 	case GOT_STATUS_MODIFY:
7615 		err = got_object_open_as_blob(&blob_base, a->repo,
7616 		    blob_id, 8192);
7617 		if (err)
7618 			break;
7619 		/* fall through */
7620 	case GOT_STATUS_ADD:
7621 		if (a->patch_cb) {
7622 			if (staged_status == GOT_STATUS_ADD) {
7623 				int choice = GOT_PATCH_CHOICE_NONE;
7624 				err = (*a->patch_cb)(&choice, a->patch_arg,
7625 				    staged_status, ie->path, NULL, 1, 1);
7626 				if (err)
7627 					break;
7628 				if (choice != GOT_PATCH_CHOICE_YES)
7629 					break;
7630 			} else {
7631 				err = unstage_hunks(staged_blob_id,
7632 				    blob_base, blob_id, ie, ondisk_path,
7633 				    label_orig, a->worktree, a->repo,
7634 				    a->patch_cb, a->patch_arg,
7635 				    a->progress_cb, a->progress_arg);
7636 				break; /* Done with this file. */
7637 			}
7638 		}
7639 		err = got_object_open_as_blob(&blob_staged, a->repo,
7640 		    staged_blob_id, 8192);
7641 		if (err)
7642 			break;
7643 		switch (got_fileindex_entry_staged_filetype_get(ie)) {
7644 		case GOT_FILEIDX_MODE_BAD_SYMLINK:
7645 		case GOT_FILEIDX_MODE_REGULAR_FILE:
7646 			err = merge_blob(&local_changes_subsumed, a->worktree,
7647 			    blob_base, ondisk_path, relpath,
7648 			    got_fileindex_perms_to_st(ie), label_orig,
7649 			    blob_staged, commit_id ? commit_id :
7650 			    a->worktree->base_commit_id, a->repo,
7651 			    a->progress_cb, a->progress_arg);
7652 			break;
7653 		case GOT_FILEIDX_MODE_SYMLINK:
7654 			if (S_ISLNK(got_fileindex_perms_to_st(ie))) {
7655 				char *staged_target;
7656 				err = got_object_blob_read_to_str(
7657 				    &staged_target, blob_staged);
7658 				if (err)
7659 					goto done;
7660 				err = merge_symlink(a->worktree, blob_base,
7661 				    ondisk_path, relpath, label_orig,
7662 				    staged_target, commit_id ? commit_id :
7663 				    a->worktree->base_commit_id,
7664 				    a->repo, a->progress_cb, a->progress_arg);
7665 				free(staged_target);
7666 			} else {
7667 				err = merge_blob(&local_changes_subsumed,
7668 				    a->worktree, blob_base, ondisk_path,
7669 				    relpath, got_fileindex_perms_to_st(ie),
7670 				    label_orig, blob_staged,
7671 				    commit_id ? commit_id :
7672 				    a->worktree->base_commit_id, a->repo,
7673 				    a->progress_cb, a->progress_arg);
7674 			}
7675 			break;
7676 		default:
7677 			err = got_error_path(relpath, GOT_ERR_BAD_FILETYPE);
7678 			break;
7679 		}
7680 		if (err == NULL)
7681 			got_fileindex_entry_stage_set(ie,
7682 			    GOT_FILEIDX_STAGE_NONE);
7683 		break;
7684 	case GOT_STATUS_DELETE:
7685 		if (a->patch_cb) {
7686 			int choice = GOT_PATCH_CHOICE_NONE;
7687 			err = (*a->patch_cb)(&choice, a->patch_arg,
7688 			    staged_status, ie->path, NULL, 1, 1);
7689 			if (err)
7690 				break;
7691 			if (choice == GOT_PATCH_CHOICE_NO)
7692 				break;
7693 			if (choice != GOT_PATCH_CHOICE_YES) {
7694 				err = got_error(GOT_ERR_PATCH_CHOICE);
7695 				break;
7696 			}
7697 		}
7698 		got_fileindex_entry_stage_set(ie, GOT_FILEIDX_STAGE_NONE);
7699 		err = get_file_status(&status, &sb, ie, ondisk_path,
7700 		    dirfd, de_name, a->repo);
7701 		if (err)
7702 			break;
7703 		err = (*a->progress_cb)(a->progress_arg, status, relpath);
7704 		break;
7705 	}
7706 done:
7707 	free(ondisk_path);
7708 	if (blob_base)
7709 		got_object_blob_close(blob_base);
7710 	if (blob_staged)
7711 		got_object_blob_close(blob_staged);
7712 	free(id_str);
7713 	free(label_orig);
7714 	return err;
7715 }
7716 
7717 const struct got_error *
7718 got_worktree_unstage(struct got_worktree *worktree,
7719     struct got_pathlist_head *paths,
7720     got_worktree_checkout_cb progress_cb, void *progress_arg,
7721     got_worktree_patch_cb patch_cb, void *patch_arg,
7722     struct got_repository *repo)
7723 {
7724 	const struct got_error *err = NULL, *sync_err, *unlockerr;
7725 	struct got_pathlist_entry *pe;
7726 	struct got_fileindex *fileindex = NULL;
7727 	char *fileindex_path = NULL;
7728 	struct unstage_path_arg upa;
7729 
7730 	err = lock_worktree(worktree, LOCK_EX);
7731 	if (err)
7732 		return err;
7733 
7734 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
7735 	if (err)
7736 		goto done;
7737 
7738 	upa.worktree = worktree;
7739 	upa.fileindex = fileindex;
7740 	upa.repo = repo;
7741 	upa.progress_cb = progress_cb;
7742 	upa.progress_arg = progress_arg;
7743 	upa.patch_cb = patch_cb;
7744 	upa.patch_arg = patch_arg;
7745 	TAILQ_FOREACH(pe, paths, entry) {
7746 		err = worktree_status(worktree, pe->path, fileindex, repo,
7747 		    unstage_path, &upa, NULL, NULL, 0, 0);
7748 		if (err)
7749 			goto done;
7750 	}
7751 
7752 	sync_err = sync_fileindex(fileindex, fileindex_path);
7753 	if (sync_err && err == NULL)
7754 		err = sync_err;
7755 done:
7756 	free(fileindex_path);
7757 	if (fileindex)
7758 		got_fileindex_free(fileindex);
7759 	unlockerr = lock_worktree(worktree, LOCK_SH);
7760 	if (unlockerr && err == NULL)
7761 		err = unlockerr;
7762 	return err;
7763 }
7764 
7765 struct report_file_info_arg {
7766 	struct got_worktree *worktree;
7767 	got_worktree_path_info_cb info_cb;
7768 	void *info_arg;
7769 	struct got_pathlist_head *paths;
7770 	got_cancel_cb cancel_cb;
7771 	void *cancel_arg;
7772 };
7773 
7774 static const struct got_error *
7775 report_file_info(void *arg, struct got_fileindex_entry *ie)
7776 {
7777 	struct report_file_info_arg *a = arg;
7778 	struct got_pathlist_entry *pe;
7779 	struct got_object_id blob_id, staged_blob_id, commit_id;
7780 	struct got_object_id *blob_idp = NULL, *staged_blob_idp = NULL;
7781 	struct got_object_id *commit_idp = NULL;
7782 	int stage;
7783 
7784 	if (a->cancel_cb && a->cancel_cb(a->cancel_arg))
7785 		return got_error(GOT_ERR_CANCELLED);
7786 
7787 	TAILQ_FOREACH(pe, a->paths, entry) {
7788 		if (pe->path_len == 0 || strcmp(pe->path, ie->path) == 0 ||
7789 		    got_path_is_child(ie->path, pe->path, pe->path_len))
7790 			break;
7791 	}
7792 	if (pe == NULL) /* not found */
7793 		return NULL;
7794 
7795 	if (got_fileindex_entry_has_blob(ie)) {
7796 		memcpy(blob_id.sha1, ie->blob_sha1, SHA1_DIGEST_LENGTH);
7797 		blob_idp = &blob_id;
7798 	}
7799 	stage = got_fileindex_entry_stage_get(ie);
7800 	if (stage == GOT_FILEIDX_STAGE_MODIFY ||
7801 	    stage == GOT_FILEIDX_STAGE_ADD) {
7802 		memcpy(staged_blob_id.sha1, ie->staged_blob_sha1,
7803 		    SHA1_DIGEST_LENGTH);
7804 		staged_blob_idp = &staged_blob_id;
7805 	}
7806 
7807 	if (got_fileindex_entry_has_commit(ie)) {
7808 		memcpy(commit_id.sha1, ie->commit_sha1, SHA1_DIGEST_LENGTH);
7809 		commit_idp = &commit_id;
7810 	}
7811 
7812 	return a->info_cb(a->info_arg, ie->path, got_fileindex_perms_to_st(ie),
7813 	    (time_t)ie->mtime_sec, blob_idp, staged_blob_idp, commit_idp);
7814 }
7815 
7816 const struct got_error *
7817 got_worktree_path_info(struct got_worktree *worktree,
7818     struct got_pathlist_head *paths,
7819     got_worktree_path_info_cb info_cb, void *info_arg,
7820     got_cancel_cb cancel_cb, void *cancel_arg)
7821 
7822 {
7823 	const struct got_error *err = NULL, *unlockerr;
7824 	struct got_fileindex *fileindex = NULL;
7825 	char *fileindex_path = NULL;
7826 	struct report_file_info_arg arg;
7827 
7828 	err = lock_worktree(worktree, LOCK_SH);
7829 	if (err)
7830 		return err;
7831 
7832 	err = open_fileindex(&fileindex, &fileindex_path, worktree);
7833 	if (err)
7834 		goto done;
7835 
7836 	arg.worktree = worktree;
7837 	arg.info_cb = info_cb;
7838 	arg.info_arg = info_arg;
7839 	arg.paths = paths;
7840 	arg.cancel_cb = cancel_cb;
7841 	arg.cancel_arg = cancel_arg;
7842 	err = got_fileindex_for_each_entry_safe(fileindex, report_file_info,
7843 	    &arg);
7844 done:
7845 	free(fileindex_path);
7846 	if (fileindex)
7847 		got_fileindex_free(fileindex);
7848 	unlockerr = lock_worktree(worktree, LOCK_UN);
7849 	if (unlockerr && err == NULL)
7850 		err = unlockerr;
7851 	return err;
7852 }