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