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 "got_compat.h"
18 
19 #include <sys/types.h>
20 #include <sys/queue.h>
21 #include <sys/uio.h>
22 #include <sys/socket.h>
23 #include <sys/stat.h>
24 #include <sys/mman.h>
25 #include <sys/resource.h>
26 
27 #include <ctype.h>
28 #include <fcntl.h>
29 #include <fnmatch.h>
30 #include <limits.h>
31 #include <dirent.h>
32 #include <stdlib.h>
33 #include <stdio.h>
34 #include <string.h>
35 #include <time.h>
36 #include <unistd.h>
37 #include <zlib.h>
38 #include <errno.h>
39 #include <libgen.h>
40 #include <stdint.h>
41 
42 #include "bloom.h"
43 
44 #include "got_error.h"
45 #include "got_reference.h"
46 #include "got_repository.h"
47 #include "got_path.h"
48 #include "got_cancel.h"
49 #include "got_object.h"
50 #include "got_opentemp.h"
51 
52 #include "got_lib_delta.h"
53 #include "got_lib_delta_cache.h"
54 #include "got_lib_inflate.h"
55 #include "got_lib_object.h"
56 #include "got_lib_object_parse.h"
57 #include "got_lib_object_create.h"
58 #include "got_lib_pack.h"
59 #include "got_lib_privsep.h"
60 #include "got_lib_hash.h"
61 #include "got_lib_object_cache.h"
62 #include "got_lib_repository.h"
63 #include "got_lib_gotconfig.h"
64 
65 #ifndef nitems
66 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
67 #endif
68 
69 #define GOT_PACK_NUM_TEMPFILES		GOT_PACK_CACHE_SIZE * 2
70 
71 RB_PROTOTYPE(got_packidx_bloom_filter_tree, got_packidx_bloom_filter, entry,
72     got_packidx_bloom_filter_cmp);
73 
74 static inline int
75 is_boolean_val(const char *val)
76 {
77 	return (strcasecmp(val, "true") == 0 ||
78 	    strcasecmp(val, "false") == 0 ||
79 	    strcasecmp(val, "on") == 0 ||
80     	    strcasecmp(val, "off") == 0 ||
81 	    strcasecmp(val, "yes") == 0 ||
82     	    strcasecmp(val, "no") == 0 ||
83 	    strcasecmp(val, "1") == 0 ||
84 	    strcasecmp(val, "0") == 0);
85 }
86 
87 static inline int
88 get_boolean_val(const char *val)
89 {
90 	return (strcasecmp(val, "true") == 0 ||
91 	    strcasecmp(val, "on") == 0 ||
92 	    strcasecmp(val, "yes") == 0 ||
93 	    strcasecmp(val, "1") == 0);
94 }
95 
96 const char *
97 got_repo_get_path(struct got_repository *repo)
98 {
99 	return repo->path;
100 }
101 
102 const char *
103 got_repo_get_path_git_dir(struct got_repository *repo)
104 {
105 	return repo->path_git_dir;
106 }
107 
108 int
109 got_repo_get_fd(struct got_repository *repo)
110 {
111 	return repo->gitdir_fd;
112 }
113 
114 enum got_hash_algorithm
115 got_repo_get_object_format(struct got_repository *repo)
116 {
117 	return repo->algo;
118 }
119 
120 const char *
121 got_repo_get_gitconfig_author_name(struct got_repository *repo)
122 {
123 	return repo->gitconfig_author_name;
124 }
125 
126 const char *
127 got_repo_get_gitconfig_author_email(struct got_repository *repo)
128 {
129 	return repo->gitconfig_author_email;
130 }
131 
132 const char *
133 got_repo_get_global_gitconfig_author_name(struct got_repository *repo)
134 {
135 	return repo->global_gitconfig_author_name;
136 }
137 
138 const char *
139 got_repo_get_global_gitconfig_author_email(struct got_repository *repo)
140 {
141 	return repo->global_gitconfig_author_email;
142 }
143 
144 const char *
145 got_repo_get_gitconfig_owner(struct got_repository *repo)
146 {
147 	return repo->gitconfig_owner;
148 }
149 
150 int
151 got_repo_has_extension(struct got_repository *repo, const char *ext)
152 {
153 	int i;
154 
155 	for (i = 0; i < repo->nextensions; ++i) {
156 		if (!strcasecmp(ext, repo->extnames[i]))
157 			return get_boolean_val(repo->extvals[i]);
158 	}
159 
160 	return 0;
161 }
162 
163 int
164 got_repo_is_bare(struct got_repository *repo)
165 {
166 	return (strcmp(repo->path, repo->path_git_dir) == 0);
167 }
168 
169 static char *
170 get_path_git_child(struct got_repository *repo, const char *basename)
171 {
172 	char *path_child;
173 
174 	if (asprintf(&path_child, "%s/%s", repo->path_git_dir,
175 	    basename) == -1)
176 		return NULL;
177 
178 	return path_child;
179 }
180 
181 char *
182 got_repo_get_path_objects(struct got_repository *repo)
183 {
184 	return get_path_git_child(repo, GOT_OBJECTS_DIR);
185 }
186 
187 char *
188 got_repo_get_path_objects_pack(struct got_repository *repo)
189 {
190 	return get_path_git_child(repo, GOT_OBJECTS_PACK_DIR);
191 }
192 
193 char *
194 got_repo_get_path_refs(struct got_repository *repo)
195 {
196 	return get_path_git_child(repo, GOT_REFS_DIR);
197 }
198 
199 char *
200 got_repo_get_path_packed_refs(struct got_repository *repo)
201 {
202 	return get_path_git_child(repo, GOT_PACKED_REFS_FILE);
203 }
204 
205 static char *
206 get_path_head(struct got_repository *repo)
207 {
208 	return get_path_git_child(repo, GOT_HEAD_FILE);
209 }
210 
211 char *
212 got_repo_get_path_gitconfig(struct got_repository *repo)
213 {
214 	return get_path_git_child(repo, GOT_GITCONFIG);
215 }
216 
217 char *
218 got_repo_get_path_gotconfig(struct got_repository *repo)
219 {
220 	return get_path_git_child(repo, GOT_GOTCONFIG_FILENAME);
221 }
222 
223 const struct got_gotconfig *
224 got_repo_get_gotconfig(struct got_repository *repo)
225 {
226 	return repo->gotconfig;
227 }
228 
229 void
230 got_repo_get_gitconfig_remotes(int *nremotes,
231     const struct got_remote_repo **remotes, struct got_repository *repo)
232 {
233 	*nremotes = repo->ngitconfig_remotes;
234 	*remotes = repo->gitconfig_remotes;
235 }
236 
237 static int
238 is_git_repo(struct got_repository *repo)
239 {
240 	const char *path_git = got_repo_get_path_git_dir(repo);
241 	char *path_objects = got_repo_get_path_objects(repo);
242 	char *path_refs = got_repo_get_path_refs(repo);
243 	char *path_head = get_path_head(repo);
244 	int ret = 0;
245 	struct stat sb;
246 	struct got_reference *head_ref;
247 
248 	if (lstat(path_git, &sb) == -1)
249 		goto done;
250 	if (!S_ISDIR(sb.st_mode))
251 		goto done;
252 
253 	if (lstat(path_objects, &sb) == -1)
254 		goto done;
255 	if (!S_ISDIR(sb.st_mode))
256 		goto done;
257 
258 	if (lstat(path_refs, &sb) == -1)
259 		goto done;
260 	if (!S_ISDIR(sb.st_mode))
261 		goto done;
262 
263 	if (lstat(path_head, &sb) == -1)
264 		goto done;
265 	if (!S_ISREG(sb.st_mode))
266 		goto done;
267 
268 	/* Check if the HEAD reference can be opened. */
269 	if (got_ref_open(&head_ref, repo, GOT_REF_HEAD, 0) != NULL)
270 		goto done;
271 	got_ref_close(head_ref);
272 
273 	ret = 1;
274 done:
275 	free(path_objects);
276 	free(path_refs);
277 	free(path_head);
278 	return ret;
279 
280 }
281 
282 static const struct got_error *
283 close_tempfiles(int *fds, size_t nfds)
284 {
285 	const struct got_error *err = NULL;
286 	int i;
287 
288 	for (i = 0; i < nfds; i++) {
289 		if (fds[i] == -1)
290 			continue;
291 		if (close(fds[i]) == -1) {
292 			err = got_error_from_errno("close");
293 			break;
294 		}
295 	}
296 	free(fds);
297 	return err;
298 }
299 
300 static const struct got_error *
301 open_tempfiles(int **fds, size_t array_size, size_t nfds)
302 {
303 	const struct got_error *err = NULL;
304 	int i;
305 
306 	*fds = calloc(array_size, sizeof(**fds));
307 	if (*fds == NULL)
308 		return got_error_from_errno("calloc");
309 
310 	for (i = 0; i < array_size; i++)
311 		(*fds)[i] = -1;
312 
313 	for (i = 0; i < nfds; i++) {
314 		(*fds)[i] = got_opentempfd();
315 		if ((*fds)[i] == -1) {
316 			err = got_error_from_errno("got_opentempfd");
317 			close_tempfiles(*fds, nfds);
318 			*fds = NULL;
319 			return err;
320 		}
321 	}
322 
323 	return NULL;
324 }
325 
326 static const struct got_error *
327 get_pack_cache_size(int *pack_cache_size)
328 {
329 	struct rlimit rl;
330 
331 	if (getrlimit(RLIMIT_NOFILE, &rl) == -1)
332 		return got_error_from_errno("getrlimit");
333 
334 	*pack_cache_size = GOT_PACK_CACHE_SIZE;
335 	if (*pack_cache_size > rl.rlim_cur / 8)
336 		*pack_cache_size = rl.rlim_cur / 8;
337 
338 	return NULL;
339 }
340 
341 const struct got_error *
342 got_repo_pack_fds_open(int **pack_fds)
343 {
344 	const struct got_error *err;
345 	int nfds;
346 
347 	err = get_pack_cache_size(&nfds);
348 	if (err)
349 		return err;
350 
351 	/*
352 	 * We need one basefd and one accumfd per cached pack.
353 	 * Our constants should be set up in a way such that
354 	 * this error never triggers.
355 	 */
356 	if (nfds * 2 > GOT_PACK_NUM_TEMPFILES)
357 		return got_error(GOT_ERR_NO_SPACE);
358 
359 	return open_tempfiles(pack_fds, GOT_PACK_NUM_TEMPFILES, nfds * 2);
360 }
361 
362 const struct got_error *
363 got_repo_pack_fds_close(int *pack_fds)
364 {
365 	return close_tempfiles(pack_fds, GOT_PACK_NUM_TEMPFILES);
366 }
367 
368 const struct got_error *
369 got_repo_temp_fds_open(int **temp_fds)
370 {
371 	return open_tempfiles(temp_fds, GOT_REPO_NUM_TEMPFILES,
372 	    GOT_REPO_NUM_TEMPFILES);
373 }
374 
375 void
376 got_repo_temp_fds_set(struct got_repository *repo, int *temp_fds)
377 {
378 	int i;
379 
380 	for (i = 0; i < GOT_REPO_NUM_TEMPFILES; i++)
381 		repo->tempfiles[i] = temp_fds[i];
382 }
383 
384 const struct got_error *
385 got_repo_temp_fds_get(int *fd, int *idx, struct got_repository *repo)
386 {
387 	int i;
388 
389 	*fd = -1;
390 	*idx = -1;
391 
392 	for (i = 0; i < nitems(repo->tempfiles); i++) {
393 		if (repo->tempfile_use_mask & (1 << i))
394 			continue;
395 		if (repo->tempfiles[i] != -1) {
396 			if (ftruncate(repo->tempfiles[i], 0L) == -1)
397 				return got_error_from_errno("ftruncate");
398 			*fd = repo->tempfiles[i];
399 			*idx = i;
400 			repo->tempfile_use_mask |= (1 << i);
401 			return NULL;
402 		}
403 	}
404 
405 	return got_error(GOT_ERR_REPO_TEMPFILE);
406 }
407 
408 void
409 got_repo_temp_fds_put(int idx, struct got_repository *repo)
410 {
411 	repo->tempfile_use_mask &= ~(1 << idx);
412 }
413 
414 const struct got_error *
415 got_repo_temp_fds_close(int *temp_fds)
416 {
417 	return close_tempfiles(temp_fds, GOT_REPO_NUM_TEMPFILES);
418 }
419 
420 const struct got_error *
421 got_repo_cache_object(struct got_repository *repo, struct got_object_id *id,
422     struct got_object *obj)
423 {
424 #ifndef GOT_NO_OBJ_CACHE
425 	const struct got_error *err = NULL;
426 	err = got_object_cache_add(&repo->objcache, id, obj);
427 	if (err) {
428 		if (err->code == GOT_ERR_OBJ_EXISTS ||
429 		    err->code == GOT_ERR_OBJ_TOO_LARGE)
430 			err = NULL;
431 		return err;
432 	}
433 	obj->refcnt++;
434 #endif
435 	return NULL;
436 }
437 
438 struct got_object *
439 got_repo_get_cached_object(struct got_repository *repo,
440     struct got_object_id *id)
441 {
442 	return (struct got_object *)got_object_cache_get(&repo->objcache, id);
443 }
444 
445 const struct got_error *
446 got_repo_cache_tree(struct got_repository *repo, struct got_object_id *id,
447     struct got_tree_object *tree)
448 {
449 #ifndef GOT_NO_OBJ_CACHE
450 	const struct got_error *err = NULL;
451 	err = got_object_cache_add(&repo->treecache, id, tree);
452 	if (err) {
453 		if (err->code == GOT_ERR_OBJ_EXISTS ||
454 		    err->code == GOT_ERR_OBJ_TOO_LARGE)
455 			err = NULL;
456 		return err;
457 	}
458 	tree->refcnt++;
459 #endif
460 	return NULL;
461 }
462 
463 struct got_tree_object *
464 got_repo_get_cached_tree(struct got_repository *repo,
465     struct got_object_id *id)
466 {
467 	return (struct got_tree_object *)got_object_cache_get(
468 	    &repo->treecache, id);
469 }
470 
471 const struct got_error *
472 got_repo_cache_commit(struct got_repository *repo, struct got_object_id *id,
473     struct got_commit_object *commit)
474 {
475 #ifndef GOT_NO_OBJ_CACHE
476 	const struct got_error *err = NULL;
477 	err = got_object_cache_add(&repo->commitcache, id, commit);
478 	if (err) {
479 		if (err->code == GOT_ERR_OBJ_EXISTS ||
480 		    err->code == GOT_ERR_OBJ_TOO_LARGE)
481 			err = NULL;
482 		return err;
483 	}
484 	commit->refcnt++;
485 #endif
486 	return NULL;
487 }
488 
489 struct got_commit_object *
490 got_repo_get_cached_commit(struct got_repository *repo,
491     struct got_object_id *id)
492 {
493 	return (struct got_commit_object *)got_object_cache_get(
494 	    &repo->commitcache, id);
495 }
496 
497 const struct got_error *
498 got_repo_cache_tag(struct got_repository *repo, struct got_object_id *id,
499     struct got_tag_object *tag)
500 {
501 #ifndef GOT_NO_OBJ_CACHE
502 	const struct got_error *err = NULL;
503 	err = got_object_cache_add(&repo->tagcache, id, tag);
504 	if (err) {
505 		if (err->code == GOT_ERR_OBJ_EXISTS ||
506 		    err->code == GOT_ERR_OBJ_TOO_LARGE)
507 			err = NULL;
508 		return err;
509 	}
510 	tag->refcnt++;
511 #endif
512 	return NULL;
513 }
514 
515 struct got_tag_object *
516 got_repo_get_cached_tag(struct got_repository *repo, struct got_object_id *id)
517 {
518 	return (struct got_tag_object *)got_object_cache_get(
519 	    &repo->tagcache, id);
520 }
521 
522 const struct got_error *
523 got_repo_cache_raw_object(struct got_repository *repo, struct got_object_id *id,
524     struct got_raw_object *raw)
525 {
526 #ifndef GOT_NO_OBJ_CACHE
527 	const struct got_error *err = NULL;
528 	err = got_object_cache_add(&repo->rawcache, id, raw);
529 	if (err) {
530 		if (err->code == GOT_ERR_OBJ_EXISTS ||
531 		    err->code == GOT_ERR_OBJ_TOO_LARGE)
532 			err = NULL;
533 		return err;
534 	}
535 	raw->refcnt++;
536 #endif
537 	return NULL;
538 }
539 
540 
541 struct got_raw_object *
542 got_repo_get_cached_raw_object(struct got_repository *repo,
543     struct got_object_id *id)
544 {
545 	return (struct got_raw_object *)got_object_cache_get(&repo->rawcache, id);
546 }
547 
548 
549 static const struct got_error *
550 open_repo(struct got_repository *repo, const char *path)
551 {
552 	const struct got_error *err = NULL;
553 
554 	repo->gitdir_fd = -1;
555 
556 	/* bare git repository? */
557 	repo->path_git_dir = strdup(path);
558 	if (repo->path_git_dir == NULL)
559 		return got_error_from_errno("strdup");
560 	if (is_git_repo(repo)) {
561 		repo->path = strdup(repo->path_git_dir);
562 		if (repo->path == NULL) {
563 			err = got_error_from_errno("strdup");
564 			goto done;
565 		}
566 		repo->gitdir_fd = open(repo->path_git_dir,
567 		    O_DIRECTORY | O_CLOEXEC);
568 		if (repo->gitdir_fd == -1) {
569 			err = got_error_from_errno2("open",
570 			    repo->path_git_dir);
571 			goto done;
572 		}
573 		return NULL;
574 	}
575 
576 	/* git repository with working tree? */
577 	free(repo->path_git_dir);
578 	repo->path_git_dir = NULL;
579 	if (asprintf(&repo->path_git_dir, "%s/%s", path, GOT_GIT_DIR) == -1) {
580 		err = got_error_from_errno("asprintf");
581 		goto done;
582 	}
583 	if (is_git_repo(repo)) {
584 		repo->path = strdup(path);
585 		if (repo->path == NULL) {
586 			err = got_error_from_errno("strdup");
587 			goto done;
588 		}
589 		repo->gitdir_fd = open(repo->path_git_dir,
590 		    O_DIRECTORY | O_CLOEXEC);
591 		if (repo->gitdir_fd == -1) {
592 			err = got_error_from_errno2("open",
593 			    repo->path_git_dir);
594 			goto done;
595 		}
596 		return NULL;
597 	}
598 
599 	err = got_error(GOT_ERR_NOT_GIT_REPO);
600 done:
601 	if (err) {
602 		free(repo->path);
603 		repo->path = NULL;
604 		free(repo->path_git_dir);
605 		repo->path_git_dir = NULL;
606 		if (repo->gitdir_fd != -1)
607 			close(repo->gitdir_fd);
608 		repo->gitdir_fd = -1;
609 
610 	}
611 	return err;
612 }
613 
614 static const struct got_error *
615 read_gitconfig(struct got_repository *repo, const char *global_gitconfig_path)
616 {
617 	const struct got_error *err = NULL;
618 	char *repo_gitconfig_path = NULL;
619 
620 	if (global_gitconfig_path) {
621 		/* Read settings from ~/.gitconfig. */
622 		int dummy_repo_version;
623 		err = got_repo_read_gitconfig(&dummy_repo_version,
624 		    &repo->global_gitconfig_author_name,
625 		    &repo->global_gitconfig_author_email,
626 		    NULL, NULL, NULL, NULL, NULL, NULL,
627 		    global_gitconfig_path);
628 		if (err)
629 			return err;
630 	}
631 
632 	/* Read repository's .git/config file. */
633 	repo_gitconfig_path = got_repo_get_path_gitconfig(repo);
634 	if (repo_gitconfig_path == NULL)
635 		return got_error_from_errno("got_repo_get_path_gitconfig");
636 
637 	err = got_repo_read_gitconfig(
638 	    &repo->gitconfig_repository_format_version,
639 	    &repo->gitconfig_author_name, &repo->gitconfig_author_email,
640 	    &repo->gitconfig_remotes, &repo->ngitconfig_remotes,
641 	    &repo->gitconfig_owner, &repo->extnames, &repo->extvals,
642 	    &repo->nextensions, repo_gitconfig_path);
643 	if (err)
644 		goto done;
645 
646 	if (getenv("GOT_IGNORE_GITCONFIG") != NULL) {
647 		int i;
648 
649 		for (i = 0; i < repo->ngitconfig_remotes; i++) {
650 			got_repo_free_remote_repo_data(
651 			    &repo->gitconfig_remotes[i]);
652 		}
653 		free(repo->gitconfig_remotes);
654 		repo->gitconfig_remotes = NULL;
655 		repo->ngitconfig_remotes = 0;
656 
657 		free(repo->gitconfig_author_name);
658 		repo->gitconfig_author_name = NULL;
659 		free(repo->gitconfig_author_email);
660 		repo->gitconfig_author_email = NULL;
661 
662 		free(repo->global_gitconfig_author_name);
663 		repo->global_gitconfig_author_name = NULL;
664 		free(repo->global_gitconfig_author_email);
665 		repo->global_gitconfig_author_email = NULL;
666 	}
667 
668 done:
669 	free(repo_gitconfig_path);
670 	return err;
671 }
672 
673 static const struct got_error *
674 read_gotconfig(struct got_repository *repo)
675 {
676 	const struct got_error *err = NULL;
677 	char *gotconfig_path;
678 
679 	gotconfig_path = got_repo_get_path_gotconfig(repo);
680 	if (gotconfig_path == NULL)
681 		return got_error_from_errno("got_repo_get_path_gotconfig");
682 
683 	err = got_gotconfig_read(&repo->gotconfig, gotconfig_path);
684 	free(gotconfig_path);
685 	return err;
686 }
687 
688 /* Supported repository format extensions. */
689 static const char *const repo_extensions[] = {
690 	"noop",			/* Got supports repository format version 1. */
691 	"preciousObjects",	/* Supported by gotadmin cleanup. */
692 	"worktreeConfig",	/* Got does not care about Git work trees. */
693 };
694 
695 const struct got_error *
696 got_repo_open(struct got_repository **repop, const char *path,
697     const char *global_gitconfig_path, int *pack_fds)
698 {
699 	struct got_repository *repo = NULL;
700 	const struct got_error *err = NULL;
701 	char *repo_path = NULL;
702 	size_t i, j = 0;
703 
704 	*repop = NULL;
705 
706 	repo = calloc(1, sizeof(*repo));
707 	if (repo == NULL)
708 		return got_error_from_errno("calloc");
709 
710 	RB_INIT(&repo->packidx_bloom_filters);
711 	TAILQ_INIT(&repo->packidx_paths);
712 
713 	for (i = 0; i < nitems(repo->privsep_children); i++) {
714 		memset(&repo->privsep_children[i], 0,
715 		    sizeof(repo->privsep_children[0]));
716 		repo->privsep_children[i].imsg_fd = -1;
717 	}
718 
719 	err = got_object_cache_init(&repo->objcache,
720 	    GOT_OBJECT_CACHE_TYPE_OBJ);
721 	if (err)
722 		goto done;
723 	err = got_object_cache_init(&repo->treecache,
724 	    GOT_OBJECT_CACHE_TYPE_TREE);
725 	if (err)
726 		goto done;
727 	err = got_object_cache_init(&repo->commitcache,
728 	    GOT_OBJECT_CACHE_TYPE_COMMIT);
729 	if (err)
730 		goto done;
731 	err = got_object_cache_init(&repo->tagcache,
732 	    GOT_OBJECT_CACHE_TYPE_TAG);
733 	if (err)
734 		goto done;
735 	err = got_object_cache_init(&repo->rawcache,
736 	    GOT_OBJECT_CACHE_TYPE_RAW);
737 	if (err)
738 		goto done;
739 
740 	err = get_pack_cache_size(&repo->pack_cache_size);
741 	if (err)
742 		goto done;
743 	for (i = 0; i < nitems(repo->packs); i++) {
744 		if (pack_fds != NULL && i < repo->pack_cache_size) {
745 			repo->packs[i].basefd = pack_fds[j++];
746 			repo->packs[i].accumfd = pack_fds[j++];
747 		} else {
748 			repo->packs[i].basefd = -1;
749 			repo->packs[i].accumfd = -1;
750 		}
751 	}
752 	for (i = 0; i < nitems(repo->tempfiles); i++)
753 		repo->tempfiles[i] = -1;
754 	repo->pinned_pack = -1;
755 	repo->pinned_packidx = -1;
756 	repo->pinned_pid = 0;
757 
758 	repo_path = realpath(path, NULL);
759 	if (repo_path == NULL) {
760 		err = got_error_from_errno2("realpath", path);
761 		goto done;
762 	}
763 
764 	for (;;) {
765 		char *parent_path;
766 
767 		err = open_repo(repo, repo_path);
768 		if (err == NULL)
769 			break;
770 		if (err->code != GOT_ERR_NOT_GIT_REPO)
771 			goto done;
772 		if (repo_path[0] == '/' && repo_path[1] == '\0') {
773 			err = got_error(GOT_ERR_NOT_GIT_REPO);
774 			goto done;
775 		}
776 		err = got_path_dirname(&parent_path, repo_path);
777 		if (err)
778 			goto done;
779 		free(repo_path);
780 		repo_path = parent_path;
781 	}
782 
783 	err = read_gotconfig(repo);
784 	if (err)
785 		goto done;
786 
787 	err = read_gitconfig(repo, global_gitconfig_path);
788 	if (err)
789 		goto done;
790 	if (repo->gitconfig_repository_format_version != 0) {
791 		err = got_error_path(path, GOT_ERR_GIT_REPO_FORMAT);
792 		goto done;
793 	}
794 	for (i = 0; i < repo->nextensions; i++) {
795 		char *ext = repo->extnames[i];
796 		char *val = repo->extvals[i];
797 		int j, supported = 0;
798 
799 		if (!is_boolean_val(val)) {
800 			err = got_error_path(ext, GOT_ERR_GIT_REPO_EXT);
801 			goto done;
802 		}
803 
804 		if (!get_boolean_val(val))
805 			continue;
806 
807 		for (j = 0; j < nitems(repo_extensions); j++) {
808 			if (strcmp(ext, repo_extensions[j]) == 0) {
809 				supported = 1;
810 				break;
811 			}
812 		}
813 		if (!supported) {
814 			err = got_error_path(ext, GOT_ERR_GIT_REPO_EXT);
815 			goto done;
816 		}
817 	}
818 
819 	err = got_repo_list_packidx(&repo->packidx_paths, repo);
820 done:
821 	if (err)
822 		got_repo_close(repo);
823 	else
824 		*repop = repo;
825 	free(repo_path);
826 	return err;
827 }
828 
829 const struct got_error *
830 got_repo_close(struct got_repository *repo)
831 {
832 	const struct got_error *err = NULL, *child_err;
833 	struct got_packidx_bloom_filter *bf;
834 	size_t i;
835 
836 	for (i = 0; i < repo->pack_cache_size; i++) {
837 		if (repo->packidx_cache[i] == NULL)
838 			break;
839 		got_packidx_close(repo->packidx_cache[i]);
840 	}
841 
842 	while ((bf = RB_MIN(got_packidx_bloom_filter_tree,
843 	    &repo->packidx_bloom_filters))) {
844 		RB_REMOVE(got_packidx_bloom_filter_tree,
845 		    &repo->packidx_bloom_filters, bf);
846 		bloom_free(bf->bloom);
847 		free(bf->bloom);
848 		free(bf);
849 	}
850 
851 	for (i = 0; i < repo->pack_cache_size; i++)
852 		if (repo->packs[i].path_packfile)
853 			if (repo->packs[i].path_packfile)
854 				got_pack_close(&repo->packs[i]);
855 
856 	free(repo->path);
857 	free(repo->path_git_dir);
858 
859 	got_object_cache_close(&repo->objcache);
860 	got_object_cache_close(&repo->treecache);
861 	got_object_cache_close(&repo->commitcache);
862 	got_object_cache_close(&repo->tagcache);
863 	got_object_cache_close(&repo->rawcache);
864 
865 	for (i = 0; i < nitems(repo->privsep_children); i++) {
866 		if (repo->privsep_children[i].imsg_fd == -1)
867 			continue;
868 		imsg_clear(repo->privsep_children[i].ibuf);
869 		free(repo->privsep_children[i].ibuf);
870 		err = got_privsep_send_stop(repo->privsep_children[i].imsg_fd);
871 		if (err && err->code == GOT_ERR_EOF)
872 			err = NULL;
873 		child_err = got_privsep_wait_for_child(
874 		    repo->privsep_children[i].pid);
875 		if (child_err && err == NULL)
876 			err = child_err;
877 		if (close(repo->privsep_children[i].imsg_fd) == -1 &&
878 		    err == NULL)
879 			err = got_error_from_errno("close");
880 	}
881 
882 	if (repo->gitdir_fd != -1 && close(repo->gitdir_fd) == -1 &&
883 	    err == NULL)
884 		err = got_error_from_errno("close");
885 
886 	if (repo->gotconfig)
887 		got_gotconfig_free(repo->gotconfig);
888 	free(repo->gitconfig_author_name);
889 	free(repo->gitconfig_author_email);
890 	for (i = 0; i < repo->ngitconfig_remotes; i++)
891 		got_repo_free_remote_repo_data(&repo->gitconfig_remotes[i]);
892 	free(repo->gitconfig_remotes);
893 	for (i = 0; i < repo->nextensions; i++) {
894 		free(repo->extnames[i]);
895 		free(repo->extvals[i]);
896 	}
897 	free(repo->extnames);
898 	free(repo->extvals);
899 
900 	got_pathlist_free(&repo->packidx_paths, GOT_PATHLIST_FREE_PATH);
901 	free(repo);
902 
903 	return err;
904 }
905 
906 const struct got_error *
907 got_repo_remote_repo_dup(struct got_remote_repo **newp,
908     const struct got_remote_repo *repo)
909 {
910 	const struct got_error *err = NULL;
911 	struct got_remote_repo *new;
912 	int i;
913 
914 	new = calloc(1, sizeof(*new));
915 	if (new == NULL)
916 		return got_error_from_errno("calloc");
917 	
918 	if (repo->name) {
919 		new->name = strdup(repo->name);
920 		if (new->name == NULL) {
921 			err = got_error_from_errno("strdup");
922 			goto done;
923 		}
924 	}
925 
926 	if (repo->fetch_url) {
927 		new->fetch_url = strdup(repo->fetch_url);
928 		if (new->fetch_url == NULL) {
929 			err = got_error_from_errno("strdup");
930 			goto done;
931 		}
932 	}
933 
934 	if (repo->send_url) {
935 		new->send_url = strdup(repo->send_url);
936 		if (new->send_url == NULL) {
937 			err = got_error_from_errno("strdup");
938 			goto done;
939 		}
940 	}
941 
942 	new->mirror_references = repo->mirror_references;
943 
944 	new->fetch_all_branches = repo->fetch_all_branches;
945 
946 	new->nfetch_branches = repo->nfetch_branches;
947 	if (repo->fetch_branches) {
948 		new->fetch_branches = calloc(repo->nfetch_branches,
949 		    sizeof(char *));
950 		if (new->fetch_branches == NULL) {
951 			err = got_error_from_errno("calloc");
952 			goto done;
953 		}
954 		for (i = 0; i < repo->nfetch_branches; i++) {
955 			new->fetch_branches[i] = strdup(
956 			    repo->fetch_branches[i]);
957 			if (new->fetch_branches[i] == NULL) {
958 				err = got_error_from_errno("strdup");
959 				goto done;
960 			}
961 		}
962 	}
963 
964 	new->nsend_branches = repo->nsend_branches;
965 	if (repo->send_branches) {
966 		new->send_branches = calloc(repo->nsend_branches,
967 		    sizeof(char *));
968 		if (new->send_branches == NULL) {
969 			err = got_error_from_errno("calloc");
970 			goto done;
971 		}
972 		for (i = 0; i < repo->nsend_branches; i++) {
973 			new->send_branches[i] = strdup(
974 			    repo->send_branches[i]);
975 			if (new->send_branches[i] == NULL) {
976 				err = got_error_from_errno("strdup");
977 				goto done;
978 			}
979 		}
980 	}
981 
982 	new->nfetch_refs = repo->nfetch_refs;
983 	if (repo->fetch_refs) {
984 		new->fetch_refs = calloc(repo->nfetch_refs,
985 		    sizeof(char *));
986 		if (new->fetch_refs == NULL) {
987 			err = got_error_from_errno("calloc");
988 			goto done;
989 		}
990 		for (i = 0; i < repo->nfetch_refs; i++) {
991 			new->fetch_refs[i] = strdup(
992 			    repo->fetch_refs[i]);
993 			if (new->fetch_refs[i] == NULL) {
994 				err = got_error_from_errno("strdup");
995 				goto done;
996 			}
997 		}
998 	}
999 done:
1000 	if (err) {
1001 		got_repo_free_remote_repo_data(new);
1002 		free(new);
1003 	} else
1004 		*newp = new;
1005 
1006 	return err;
1007 }
1008 
1009 void
1010 got_repo_free_remote_repo_data(struct got_remote_repo *repo)
1011 {
1012 	int i;
1013 
1014 	if (repo == NULL)
1015 		return;
1016 
1017 	free(repo->name);
1018 	repo->name = NULL;
1019 	free(repo->fetch_url);
1020 	repo->fetch_url = NULL;
1021 	free(repo->send_url);
1022 	repo->send_url = NULL;
1023 	for (i = 0; i < repo->nfetch_branches; i++)
1024 		free(repo->fetch_branches[i]);
1025 	free(repo->fetch_branches);
1026 	repo->fetch_branches = NULL;
1027 	repo->nfetch_branches = 0;
1028 	for (i = 0; i < repo->nsend_branches; i++)
1029 		free(repo->send_branches[i]);
1030 	free(repo->send_branches);
1031 	repo->send_branches = NULL;
1032 	repo->nsend_branches = 0;
1033 	for (i = 0; i < repo->nfetch_refs; i++)
1034 		free(repo->fetch_refs[i]);
1035 	free(repo->fetch_refs);
1036 	repo->fetch_refs = NULL;
1037 	repo->nfetch_refs = 0;
1038 }
1039 
1040 const struct got_error *
1041 got_repo_map_path(char **in_repo_path, struct got_repository *repo,
1042     const char *input_path)
1043 {
1044 	const struct got_error *err = NULL;
1045 	const char *repo_abspath = NULL;
1046 	size_t repolen, len;
1047 	char *canonpath, *path = NULL;
1048 
1049 	*in_repo_path = NULL;
1050 
1051 	canonpath = strdup(input_path);
1052 	if (canonpath == NULL) {
1053 		err = got_error_from_errno("strdup");
1054 		goto done;
1055 	}
1056 	err = got_canonpath(input_path, canonpath, strlen(canonpath) + 1);
1057 	if (err)
1058 		goto done;
1059 
1060 	repo_abspath = got_repo_get_path(repo);
1061 
1062 	if (canonpath[0] == '\0') {
1063 		path = strdup(canonpath);
1064 		if (path == NULL) {
1065 			err = got_error_from_errno("strdup");
1066 			goto done;
1067 		}
1068 	} else {
1069 		path = realpath(canonpath, NULL);
1070 		if (path == NULL) {
1071 			if (errno != ENOENT) {
1072 				err = got_error_from_errno2("realpath",
1073 				    canonpath);
1074 				goto done;
1075 			}
1076 			/*
1077 			 * Path is not on disk.
1078 			 * Assume it is already relative to repository root.
1079 			 */
1080 			path = strdup(canonpath);
1081 			if (path == NULL) {
1082 				err = got_error_from_errno("strdup");
1083 				goto done;
1084 			}
1085 		}
1086 
1087 		repolen = strlen(repo_abspath);
1088 		len = strlen(path);
1089 
1090 
1091 		if (strcmp(path, repo_abspath) == 0) {
1092 			free(path);
1093 			path = strdup("");
1094 			if (path == NULL) {
1095 				err = got_error_from_errno("strdup");
1096 				goto done;
1097 			}
1098 		} else if (len > repolen &&
1099 		    got_path_is_child(path, repo_abspath, repolen)) {
1100 			/* Matched an on-disk path inside repository. */
1101 			if (got_repo_is_bare(repo)) {
1102 				/*
1103 				 * Matched an on-disk path inside repository
1104 				 * database. Treat input as repository-relative.
1105 				 */
1106 				free(path);
1107 				path = canonpath;
1108 				canonpath = NULL;
1109 			} else {
1110 				char *child;
1111 				/* Strip common prefix with repository path. */
1112 				err = got_path_skip_common_ancestor(&child,
1113 				    repo_abspath, path);
1114 				if (err)
1115 					goto done;
1116 				free(path);
1117 				path = child;
1118 			}
1119 		} else {
1120 			/*
1121 			 * Matched unrelated on-disk path.
1122 			 * Treat input as repository-relative.
1123 			 */
1124 			free(path);
1125 			path = canonpath;
1126 			canonpath = NULL;
1127 		}
1128 	}
1129 
1130 	/* Make in-repository path absolute */
1131 	if (path[0] != '/') {
1132 		char *abspath;
1133 		if (asprintf(&abspath, "/%s", path) == -1) {
1134 			err = got_error_from_errno("asprintf");
1135 			goto done;
1136 		}
1137 		free(path);
1138 		path = abspath;
1139 	}
1140 
1141 done:
1142 	free(canonpath);
1143 	if (err)
1144 		free(path);
1145 	else
1146 		*in_repo_path = path;
1147 	return err;
1148 }
1149 
1150 static const struct got_error *
1151 cache_packidx(struct got_repository *repo, struct got_packidx *packidx,
1152     const char *path_packidx)
1153 {
1154 	const struct got_error *err = NULL;
1155 	size_t i;
1156 
1157 	for (i = 0; i < repo->pack_cache_size; i++) {
1158 		if (repo->packidx_cache[i] == NULL)
1159 			break;
1160 		if (strcmp(repo->packidx_cache[i]->path_packidx,
1161 		    path_packidx) == 0) {
1162 			return got_error(GOT_ERR_CACHE_DUP_ENTRY);
1163 		}
1164 	}
1165 	if (i == repo->pack_cache_size) {
1166 		do {
1167 			i--;
1168 		} while (i > 0 && repo->pinned_packidx >= 0 &&
1169 		    i == repo->pinned_packidx);
1170 		err = got_packidx_close(repo->packidx_cache[i]);
1171 		if (err)
1172 			return err;
1173 	}
1174 
1175 	repo->packidx_cache[i] = packidx;
1176 
1177 	return NULL;
1178 }
1179 
1180 int
1181 got_repo_is_packidx_filename(const char *name, size_t len)
1182 {
1183 	if (len != GOT_PACKIDX_NAMELEN)
1184 		return 0;
1185 
1186 	if (strncmp(name, GOT_PACK_PREFIX, strlen(GOT_PACK_PREFIX)) != 0)
1187 		return 0;
1188 
1189 	if (strcmp(name + strlen(GOT_PACK_PREFIX) +
1190 	    SHA1_DIGEST_STRING_LENGTH - 1, GOT_PACKIDX_SUFFIX) != 0)
1191 		return 0;
1192 
1193 	return 1;
1194 }
1195 
1196 static struct got_packidx_bloom_filter *
1197 get_packidx_bloom_filter(struct got_repository *repo,
1198     const char *path, size_t path_len)
1199 {
1200 	struct got_packidx_bloom_filter key;
1201 
1202 	if (strlcpy(key.path, path, sizeof(key.path)) >= sizeof(key.path))
1203 		return NULL; /* XXX */
1204 	key.path_len = path_len;
1205 
1206 	return RB_FIND(got_packidx_bloom_filter_tree,
1207 	    &repo->packidx_bloom_filters, &key);
1208 }
1209 
1210 int
1211 got_repo_check_packidx_bloom_filter(struct got_repository *repo,
1212     const char *path_packidx, struct got_object_id *id)
1213 {
1214 	struct got_packidx_bloom_filter *bf;
1215 
1216 	bf = get_packidx_bloom_filter(repo, path_packidx, strlen(path_packidx));
1217 	if (bf)
1218 		return bloom_check(bf->bloom, id->sha1, sizeof(id->sha1));
1219 
1220 	/* No bloom filter means this pack index must be searched. */
1221 	return 1;
1222 }
1223 
1224 static const struct got_error *
1225 add_packidx_bloom_filter(struct got_repository *repo,
1226     struct got_packidx *packidx, const char *path_packidx)
1227 {
1228 	int i, nobjects = be32toh(packidx->hdr.fanout_table[0xff]);
1229 	struct got_packidx_bloom_filter *bf;
1230 	size_t len;
1231 
1232 	/*
1233 	 * Don't use bloom filters for very large pack index files.
1234 	 * Large pack files will contain a relatively large fraction
1235 	 * of our objects so we will likely need to visit them anyway.
1236 	 * The more objects a pack file contains the higher the probability
1237 	 * of a false-positive match from the bloom filter. And reading
1238 	 * all object IDs from a large pack index file can be expensive.
1239 	 */
1240 	if (nobjects > 100000) /* cut-off at about 2MB, at 20 bytes per ID */
1241 		return NULL;
1242 
1243 	/* Do we already have a filter for this pack index? */
1244 	if (get_packidx_bloom_filter(repo, path_packidx,
1245 	    strlen(path_packidx)) != NULL)
1246 		return NULL;
1247 
1248 	bf = calloc(1, sizeof(*bf));
1249 	if (bf == NULL)
1250 		return got_error_from_errno("calloc");
1251 	bf->bloom = calloc(1, sizeof(*bf->bloom));
1252 	if (bf->bloom == NULL) {
1253 		free(bf);
1254 		return got_error_from_errno("calloc");
1255 	}
1256 
1257 	len = strlcpy(bf->path, path_packidx, sizeof(bf->path));
1258 	if (len >= sizeof(bf->path)) {
1259 		free(bf->bloom);
1260 		free(bf);
1261 		return got_error(GOT_ERR_NO_SPACE);
1262 	}
1263 	bf->path_len = len;
1264 
1265 	/* Minimum size supported by our bloom filter is 1000 entries. */
1266 	bloom_init(bf->bloom, nobjects < 1000 ? 1000 : nobjects, 0.1);
1267 	for (i = 0; i < nobjects; i++) {
1268 		struct got_packidx_object_id *id;
1269 		id = &packidx->hdr.sorted_ids[i];
1270 		bloom_add(bf->bloom, id->sha1, sizeof(id->sha1));
1271 	}
1272 
1273 	RB_INSERT(got_packidx_bloom_filter_tree,
1274 	    &repo->packidx_bloom_filters, bf);
1275 	return NULL;
1276 }
1277 
1278 static void
1279 purge_packidx_paths(struct got_pathlist_head *packidx_paths)
1280 {
1281 	struct got_pathlist_entry *pe;
1282 
1283 	while (!TAILQ_EMPTY(packidx_paths)) {
1284 		pe = TAILQ_FIRST(packidx_paths);
1285 		TAILQ_REMOVE(packidx_paths, pe, entry);
1286 		free((char *)pe->path);
1287 		free(pe);
1288 	}
1289 }
1290 
1291 static const struct got_error *
1292 refresh_packidx_paths(struct got_repository *repo)
1293 {
1294 	const struct got_error *err = NULL;
1295 	char *objects_pack_dir = NULL;
1296 	struct stat sb;
1297 
1298 	objects_pack_dir = got_repo_get_path_objects_pack(repo);
1299 	if (objects_pack_dir == NULL)
1300 		return got_error_from_errno("got_repo_get_path_objects_pack");
1301 
1302 	if (stat(objects_pack_dir, &sb) == -1) {
1303 		if (errno != ENOENT) {
1304 			err = got_error_from_errno2("stat", objects_pack_dir);
1305 			goto done;
1306 		}
1307 	} else if (TAILQ_EMPTY(&repo->packidx_paths) ||
1308 	    sb.st_mtim.tv_sec != repo->pack_path_mtime.tv_sec ||
1309 	    sb.st_mtim.tv_nsec != repo->pack_path_mtime.tv_nsec) {
1310 		purge_packidx_paths(&repo->packidx_paths);
1311 		err = got_repo_list_packidx(&repo->packidx_paths, repo);
1312 		if (err)
1313 			goto done;
1314 	}
1315 done:
1316 	free(objects_pack_dir);
1317 	return err;
1318 }
1319 
1320 const struct got_error *
1321 got_repo_search_packidx(struct got_packidx **packidx, int *idx,
1322     struct got_repository *repo, struct got_object_id *id)
1323 {
1324 	const struct got_error *err;
1325 	struct got_pathlist_entry *pe;
1326 	size_t i;
1327 
1328 	/* Search pack index cache. */
1329 	for (i = 0; i < repo->pack_cache_size; i++) {
1330 		if (repo->packidx_cache[i] == NULL)
1331 			break;
1332 		if (!got_repo_check_packidx_bloom_filter(repo,
1333 		    repo->packidx_cache[i]->path_packidx, id))
1334 			continue; /* object will not be found in this index */
1335 		*idx = got_packidx_get_object_idx(repo->packidx_cache[i], id);
1336 		if (*idx != -1) {
1337 			*packidx = repo->packidx_cache[i];
1338 			/*
1339 			 * Move this cache entry to the front. Repeatedly
1340 			 * searching a wrong pack index can be expensive.
1341 			 */
1342 			if (i > 0) {
1343 				memmove(&repo->packidx_cache[1],
1344 				    &repo->packidx_cache[0],
1345 				    i * sizeof(repo->packidx_cache[0]));
1346 				repo->packidx_cache[0] = *packidx;
1347 				if (repo->pinned_packidx >= 0 &&
1348 				    repo->pinned_packidx < i)
1349 					repo->pinned_packidx++;
1350 				else if (repo->pinned_packidx == i)
1351 					repo->pinned_packidx = 0;
1352 			}
1353 			return NULL;
1354 		}
1355 	}
1356 	/* No luck. Search the filesystem. */
1357 
1358 	err = refresh_packidx_paths(repo);
1359 	if (err)
1360 		return err;
1361 
1362 	TAILQ_FOREACH(pe, &repo->packidx_paths, entry) {
1363 		const char *path_packidx = pe->path;
1364 		int is_cached = 0;
1365 
1366 		if (!got_repo_check_packidx_bloom_filter(repo,
1367 		    pe->path, id))
1368 			continue; /* object will not be found in this index */
1369 
1370 		for (i = 0; i < repo->pack_cache_size; i++) {
1371 			if (repo->packidx_cache[i] == NULL)
1372 				break;
1373 			if (strcmp(repo->packidx_cache[i]->path_packidx,
1374 			    path_packidx) == 0) {
1375 				is_cached = 1;
1376 				break;
1377 			}
1378 		}
1379 		if (is_cached)
1380 			continue; /* already searched */
1381 
1382 		err = got_packidx_open(packidx, got_repo_get_fd(repo),
1383 		    path_packidx, 0);
1384 		if (err)
1385 			goto done;
1386 
1387 		err = add_packidx_bloom_filter(repo, *packidx, path_packidx);
1388 		if (err)
1389 			goto done;
1390 
1391 		err = cache_packidx(repo, *packidx, path_packidx);
1392 		if (err)
1393 			goto done;
1394 
1395 		*idx = got_packidx_get_object_idx(*packidx, id);
1396 		if (*idx != -1) {
1397 			err = NULL; /* found the object */
1398 			goto done;
1399 		}
1400 	}
1401 
1402 	err = got_error_no_obj(id);
1403 done:
1404 	return err;
1405 }
1406 
1407 const struct got_error *
1408 got_repo_list_packidx(struct got_pathlist_head *packidx_paths,
1409     struct got_repository *repo)
1410 {
1411 	const struct got_error *err = NULL;
1412 	DIR *packdir = NULL;
1413 	struct dirent *dent;
1414 	char *path_packidx = NULL;
1415 	int packdir_fd;
1416 	struct stat sb;
1417 
1418 	packdir_fd = openat(got_repo_get_fd(repo),
1419 	    GOT_OBJECTS_PACK_DIR, O_DIRECTORY | O_CLOEXEC);
1420 	if (packdir_fd == -1) {
1421 		return got_error_from_errno_fmt("openat: %s/%s",
1422 		    got_repo_get_path_git_dir(repo),
1423 		    GOT_OBJECTS_PACK_DIR);
1424 	}
1425 
1426 	packdir = fdopendir(packdir_fd);
1427 	if (packdir == NULL) {
1428 		err = got_error_from_errno("fdopendir");
1429 		close(packdir_fd);
1430 		goto done;
1431 	}
1432 
1433 	if (fstat(packdir_fd, &sb) == -1) {
1434 		err = got_error_from_errno("fstat");
1435 		goto done;
1436 	}
1437 	repo->pack_path_mtime.tv_sec = sb.st_mtim.tv_sec;
1438 	repo->pack_path_mtime.tv_nsec = sb.st_mtim.tv_nsec;
1439 
1440 	while ((dent = readdir(packdir)) != NULL) {
1441 		if (!got_repo_is_packidx_filename(dent->d_name,
1442 		    strlen(dent->d_name)))
1443 			continue;
1444 
1445 		if (asprintf(&path_packidx, "%s/%s", GOT_OBJECTS_PACK_DIR,
1446 		    dent->d_name) == -1) {
1447 			err = got_error_from_errno("asprintf");
1448 			path_packidx = NULL;
1449 			break;
1450 		}
1451 
1452 		err = got_pathlist_append(packidx_paths, path_packidx, NULL);
1453 		if (err)
1454 			break;
1455 	}
1456 done:
1457 	if (err)
1458 		free(path_packidx);
1459 	if (packdir && closedir(packdir) != 0 && err == NULL)
1460 		err = got_error_from_errno("closedir");
1461 	return err;
1462 }
1463 
1464 const struct got_error *
1465 got_repo_get_packidx(struct got_packidx **packidx, const char *path_packidx,
1466     struct got_repository *repo)
1467 {
1468 	const struct got_error *err;
1469 	size_t i;
1470 
1471 	*packidx = NULL;
1472 
1473 	/* Search pack index cache. */
1474 	for (i = 0; i < repo->pack_cache_size; i++) {
1475 		if (repo->packidx_cache[i] == NULL)
1476 			break;
1477 		if (strcmp(repo->packidx_cache[i]->path_packidx,
1478 		    path_packidx) == 0) {
1479 			*packidx = repo->packidx_cache[i];
1480 			return NULL;
1481 		}
1482 	}
1483 	/* No luck. Search the filesystem. */
1484 
1485 	err = got_packidx_open(packidx, got_repo_get_fd(repo),
1486 	    path_packidx, 0);
1487 	if (err)
1488 		return err;
1489 
1490 	err = add_packidx_bloom_filter(repo, *packidx, path_packidx);
1491 	if (err)
1492 		goto done;
1493 
1494 	err = cache_packidx(repo, *packidx, path_packidx);
1495 done:
1496 	if (err) {
1497 		got_packidx_close(*packidx);
1498 		*packidx = NULL;
1499 	}
1500 	return err;
1501 }
1502 
1503 static const struct got_error *
1504 read_packfile_hdr(int fd, struct got_packidx *packidx)
1505 {
1506 	const struct got_error *err = NULL;
1507 	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
1508 	struct got_packfile_hdr hdr;
1509 	ssize_t n;
1510 
1511 	n = read(fd, &hdr, sizeof(hdr));
1512 	if (n < 0)
1513 		return got_error_from_errno("read");
1514 	if (n != sizeof(hdr))
1515 		return got_error(GOT_ERR_BAD_PACKFILE);
1516 
1517 	if (be32toh(hdr.signature) != GOT_PACKFILE_SIGNATURE ||
1518 	    be32toh(hdr.version) != GOT_PACKFILE_VERSION ||
1519 	    be32toh(hdr.nobjects) != totobj)
1520 		err = got_error(GOT_ERR_BAD_PACKFILE);
1521 
1522 	return err;
1523 }
1524 
1525 static const struct got_error *
1526 open_packfile(int *fd, struct got_repository *repo,
1527     const char *relpath, struct got_packidx *packidx)
1528 {
1529 	const struct got_error *err = NULL;
1530 
1531 	*fd = openat(got_repo_get_fd(repo), relpath,
1532 	    O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
1533 	if (*fd == -1)
1534 		return got_error_from_errno_fmt("openat: %s/%s",
1535 		    got_repo_get_path_git_dir(repo), relpath);
1536 
1537 	if (packidx) {
1538 		err = read_packfile_hdr(*fd, packidx);
1539 		if (err) {
1540 			close(*fd);
1541 			*fd = -1;
1542 		}
1543 	}
1544 
1545 	return err;
1546 }
1547 
1548 const struct got_error *
1549 got_repo_cache_pack(struct got_pack **packp, struct got_repository *repo,
1550     const char *path_packfile, struct got_packidx *packidx)
1551 {
1552 	const struct got_error *err = NULL;
1553 	struct got_pack *pack = NULL;
1554 	struct stat sb;
1555 	size_t i;
1556 
1557 	if (packp)
1558 		*packp = NULL;
1559 
1560 	for (i = 0; i < repo->pack_cache_size; i++) {
1561 		pack = &repo->packs[i];
1562 		if (pack->path_packfile == NULL)
1563 			break;
1564 		if (strcmp(pack->path_packfile, path_packfile) == 0)
1565 			return got_error(GOT_ERR_CACHE_DUP_ENTRY);
1566 	}
1567 
1568 	if (i == repo->pack_cache_size) {
1569 		struct got_pack tmp;
1570 		do {
1571 			i--;
1572 		} while (i > 0 && repo->pinned_pack >= 0 &&
1573 		    i == repo->pinned_pack);
1574 		err = got_pack_close(&repo->packs[i]);
1575 		if (err)
1576 			return err;
1577 		if (ftruncate(repo->packs[i].basefd, 0L) == -1)
1578 			return got_error_from_errno("ftruncate");
1579 		if (ftruncate(repo->packs[i].accumfd, 0L) == -1)
1580 			return got_error_from_errno("ftruncate");
1581 		memcpy(&tmp, &repo->packs[i], sizeof(tmp));
1582 		memcpy(&repo->packs[i], &repo->packs[0],
1583 		    sizeof(repo->packs[i]));
1584 		memcpy(&repo->packs[0], &tmp, sizeof(repo->packs[0]));
1585 		if (repo->pinned_pack == 0)
1586 			repo->pinned_pack = i;
1587 		else if (repo->pinned_pack == i)
1588 			repo->pinned_pack = 0;
1589 		i = 0;
1590 	}
1591 
1592 	pack = &repo->packs[i];
1593 
1594 	pack->path_packfile = strdup(path_packfile);
1595 	if (pack->path_packfile == NULL) {
1596 		err = got_error_from_errno("strdup");
1597 		goto done;
1598 	}
1599 
1600 	err = open_packfile(&pack->fd, repo, path_packfile, packidx);
1601 	if (err)
1602 		goto done;
1603 
1604 	if (fstat(pack->fd, &sb) != 0) {
1605 		err = got_error_from_errno("fstat");
1606 		goto done;
1607 	}
1608 	pack->filesize = sb.st_size;
1609 
1610 	pack->privsep_child = NULL;
1611 
1612 	err = got_delta_cache_alloc(&pack->delta_cache);
1613 	if (err)
1614 		goto done;
1615 
1616 #ifndef GOT_PACK_NO_MMAP
1617 	if (pack->filesize > 0 && pack->filesize <= SIZE_MAX) {
1618 		pack->map = mmap(NULL, pack->filesize, PROT_READ, MAP_PRIVATE,
1619 		    pack->fd, 0);
1620 		if (pack->map == MAP_FAILED) {
1621 			if (errno != ENOMEM) {
1622 				err = got_error_from_errno("mmap");
1623 				goto done;
1624 			}
1625 			pack->map = NULL; /* fall back to read(2) */
1626 		}
1627 	}
1628 #endif
1629 done:
1630 	if (err) {
1631 		if (pack)
1632 			got_pack_close(pack);
1633 	} else if (packp)
1634 		*packp = pack;
1635 	return err;
1636 }
1637 
1638 struct got_pack *
1639 got_repo_get_cached_pack(struct got_repository *repo, const char *path_packfile)
1640 {
1641 	struct got_pack *pack = NULL;
1642 	size_t i;
1643 
1644 	for (i = 0; i < repo->pack_cache_size; i++) {
1645 		pack = &repo->packs[i];
1646 		if (pack->path_packfile == NULL)
1647 			break;
1648 		if (strcmp(pack->path_packfile, path_packfile) == 0)
1649 			return pack;
1650 	}
1651 
1652 	return NULL;
1653 }
1654 
1655 const struct got_error *
1656 got_repo_pin_pack(struct got_repository *repo, struct got_packidx *packidx,
1657     struct got_pack *pack)
1658 {
1659 	size_t i;
1660 	int pinned_pack = -1, pinned_packidx = -1;
1661 
1662 	for (i = 0; i < repo->pack_cache_size; i++) {
1663 		if (repo->packidx_cache[i] &&
1664 		    strcmp(repo->packidx_cache[i]->path_packidx,
1665 		    packidx->path_packidx) == 0)
1666 			pinned_packidx = i;
1667 		if (repo->packs[i].path_packfile &&
1668 		    strcmp(repo->packs[i].path_packfile,
1669 		    pack->path_packfile) == 0)
1670 			pinned_pack = i;
1671 	}
1672 
1673 	if (pinned_packidx == -1 || pinned_pack == -1)
1674 		return got_error(GOT_ERR_PIN_PACK);
1675 
1676 	repo->pinned_pack = pinned_pack;
1677 	repo->pinned_packidx = pinned_packidx;
1678 	if (repo->packs[pinned_pack].privsep_child)
1679 		repo->pinned_pid = repo->packs[pinned_pack].privsep_child->pid;
1680 	return NULL;
1681 }
1682 
1683 struct got_pack *
1684 got_repo_get_pinned_pack(struct got_repository *repo)
1685 {
1686 	if (repo->pinned_pack >= 0 &&
1687 	    repo->pinned_pack < repo->pack_cache_size)
1688 		return &repo->packs[repo->pinned_pack];
1689 
1690 	return NULL;
1691 }
1692 
1693 void
1694 got_repo_unpin_pack(struct got_repository *repo)
1695 {
1696 	repo->pinned_packidx = -1;
1697 	repo->pinned_pack = -1;
1698 	repo->pinned_pid = 0;
1699 }
1700 
1701 const struct got_error *
1702 got_repo_init(const char *repo_path, const char *head_name)
1703 {
1704 	const struct got_error *err = NULL;
1705 	const char *dirnames[] = {
1706 		GOT_OBJECTS_DIR,
1707 		GOT_OBJECTS_PACK_DIR,
1708 		GOT_REFS_DIR,
1709 	};
1710 	const char *description_str = "Unnamed repository; "
1711 	    "edit this file 'description' to name the repository.";
1712 	const char *headref = "ref: refs/heads/";
1713 	const char *gitconfig_str = "[core]\n"
1714 	    "\trepositoryformatversion = 0\n"
1715 	    "\tfilemode = true\n"
1716 	    "\tbare = true\n";
1717 	char *headref_str, *path;
1718 	size_t i;
1719 
1720 	if (!got_path_dir_is_empty(repo_path))
1721 		return got_error(GOT_ERR_DIR_NOT_EMPTY);
1722 
1723 	for (i = 0; i < nitems(dirnames); i++) {
1724 		if (asprintf(&path, "%s/%s", repo_path, dirnames[i]) == -1) {
1725 			return got_error_from_errno("asprintf");
1726 		}
1727 		err = got_path_mkdir(path);
1728 		free(path);
1729 		if (err)
1730 			return err;
1731 	}
1732 
1733 	if (asprintf(&path, "%s/%s", repo_path, "description") == -1)
1734 		return got_error_from_errno("asprintf");
1735 	err = got_path_create_file(path, description_str);
1736 	free(path);
1737 	if (err)
1738 		return err;
1739 
1740 	if (asprintf(&path, "%s/%s", repo_path, GOT_HEAD_FILE) == -1)
1741 		return got_error_from_errno("asprintf");
1742 	if (asprintf(&headref_str, "%s%s", headref,
1743 	    head_name ? head_name : "main") == -1) {
1744 		free(path);
1745 		return got_error_from_errno("asprintf");
1746 	}
1747 	err = got_path_create_file(path, headref_str);
1748 	free(headref_str);
1749 	free(path);
1750 	if (err)
1751 		return err;
1752 
1753 	if (asprintf(&path, "%s/%s", repo_path, "config") == -1)
1754 		return got_error_from_errno("asprintf");
1755 	err = got_path_create_file(path, gitconfig_str);
1756 	free(path);
1757 	if (err)
1758 		return err;
1759 
1760 	return NULL;
1761 }
1762 
1763 static const struct got_error *
1764 match_packed_object(struct got_object_id **unique_id,
1765     struct got_repository *repo, const char *id_str_prefix, int obj_type)
1766 {
1767 	const struct got_error *err = NULL;
1768 	struct got_object_id_queue matched_ids;
1769 	struct got_pathlist_entry *pe;
1770 	struct timespec tv;
1771 	int retries = 0;
1772 	const int max_retries = 10;
1773 
1774 	STAILQ_INIT(&matched_ids);
1775 
1776 	err = refresh_packidx_paths(repo);
1777 	if (err)
1778 		return err;
1779 
1780 	/*
1781 	 * Opening objects while iterating over the pack-index path
1782 	 * list is racy. If the set of pack files in the repository
1783 	 * changes during loop iteration, refresh_packidx_paths() will
1784 	 * be called again, via got_object_get_type(), invalidating
1785 	 * the packidx_paths list we are iterating over.
1786 	 * To work around this we keep track of the current modification
1787 	 * time and retry the entire loop if it changes.
1788 	 */
1789 retry:
1790 	tv.tv_sec = repo->pack_path_mtime.tv_sec;
1791 	tv.tv_nsec = repo->pack_path_mtime.tv_nsec;
1792 
1793 	TAILQ_FOREACH(pe, &repo->packidx_paths, entry) {
1794 		const char *path_packidx;
1795 		struct got_packidx *packidx;
1796 		struct got_object_qid *qid;
1797 
1798 		/*
1799 		 * If the modification time of the 'objects/pack' directory
1800 		 * has changed then 'pe' could now be an invalid pointer.
1801 		 */
1802 		if (tv.tv_sec != repo->pack_path_mtime.tv_sec ||
1803 		    tv.tv_nsec != repo->pack_path_mtime.tv_nsec) {
1804 			if (++retries > max_retries) {
1805 				err = got_error_msg(GOT_ERR_TIMEOUT,
1806 				    "too many concurrent pack file "
1807 				    "modifications");
1808 				goto done;
1809 			}
1810 			goto retry;
1811 		}
1812 
1813 		path_packidx = pe->path;
1814 
1815 		err = got_packidx_open(&packidx, got_repo_get_fd(repo),
1816 		    path_packidx, 0);
1817 		if (err)
1818 			break;
1819 
1820 		got_object_id_queue_free(&matched_ids);
1821 
1822 		err = got_packidx_match_id_str_prefix(&matched_ids,
1823 		    packidx, id_str_prefix);
1824 		if (err) {
1825 			got_packidx_close(packidx);
1826 			break;
1827 		}
1828 		err = got_packidx_close(packidx);
1829 		if (err)
1830 			break;
1831 
1832 		STAILQ_FOREACH(qid, &matched_ids, entry) {
1833 			if (obj_type != GOT_OBJ_TYPE_ANY) {
1834 				int matched_type;
1835 				err = got_object_get_type(&matched_type, repo,
1836 				    &qid->id);
1837 				if (err)
1838 					goto done;
1839 				if (matched_type != obj_type)
1840 					continue;
1841 			}
1842 			if (*unique_id == NULL) {
1843 				*unique_id = got_object_id_dup(&qid->id);
1844 				if (*unique_id == NULL) {
1845 					err = got_error_from_errno("malloc");
1846 					goto done;
1847 				}
1848 			} else {
1849 				if (got_object_id_cmp(*unique_id,
1850 				    &qid->id) == 0)
1851 					continue; /* packed multiple times */
1852 				err = got_error(GOT_ERR_AMBIGUOUS_ID);
1853 				goto done;
1854 			}
1855 		}
1856 	}
1857 done:
1858 	got_object_id_queue_free(&matched_ids);
1859 	if (err) {
1860 		free(*unique_id);
1861 		*unique_id = NULL;
1862 	}
1863 	return err;
1864 }
1865 
1866 static const struct got_error *
1867 match_loose_object(struct got_object_id **unique_id, const char *path_objects,
1868     const char *object_dir, const char *id_str_prefix, int obj_type,
1869     struct got_repository *repo)
1870 {
1871 	const struct got_error *err = NULL;
1872 	char *path, *id_str = NULL;
1873 	DIR *dir = NULL;
1874 	struct dirent *dent;
1875 	struct got_object_id id;
1876 
1877 	if (asprintf(&path, "%s/%s", path_objects, object_dir) == -1) {
1878 		err = got_error_from_errno("asprintf");
1879 		goto done;
1880 	}
1881 
1882 	dir = opendir(path);
1883 	if (dir == NULL) {
1884 		if (errno == ENOENT) {
1885 			err = NULL;
1886 			goto done;
1887 		}
1888 		err = got_error_from_errno2("opendir", path);
1889 		goto done;
1890 	}
1891 	while ((dent = readdir(dir)) != NULL) {
1892 		int cmp;
1893 
1894 		free(id_str);
1895 		id_str = NULL;
1896 
1897 		if (strcmp(dent->d_name, ".") == 0 ||
1898 		    strcmp(dent->d_name, "..") == 0)
1899 			continue;
1900 
1901 		if (asprintf(&id_str, "%s%s", object_dir, dent->d_name) == -1) {
1902 			err = got_error_from_errno("asprintf");
1903 			goto done;
1904 		}
1905 
1906 		if (!got_parse_object_id(&id, id_str, repo->algo))
1907 			continue;
1908 
1909 		/*
1910 		 * Directory entries do not necessarily appear in
1911 		 * sorted order, so we must iterate over all of them.
1912 		 */
1913 		cmp = strncmp(id_str, id_str_prefix, strlen(id_str_prefix));
1914 		if (cmp != 0)
1915 			continue;
1916 
1917 		if (*unique_id == NULL) {
1918 			if (obj_type != GOT_OBJ_TYPE_ANY) {
1919 				int matched_type;
1920 				err = got_object_get_type(&matched_type, repo,
1921 				    &id);
1922 				if (err)
1923 					goto done;
1924 				if (matched_type != obj_type)
1925 					continue;
1926 			}
1927 			*unique_id = got_object_id_dup(&id);
1928 			if (*unique_id == NULL) {
1929 				err = got_error_from_errno("got_object_id_dup");
1930 				goto done;
1931 			}
1932 		} else {
1933 			if (got_object_id_cmp(*unique_id, &id) == 0)
1934 				continue; /* both packed and loose */
1935 			err = got_error(GOT_ERR_AMBIGUOUS_ID);
1936 			goto done;
1937 		}
1938 	}
1939 done:
1940 	if (dir && closedir(dir) != 0 && err == NULL)
1941 		err = got_error_from_errno("closedir");
1942 	if (err) {
1943 		free(*unique_id);
1944 		*unique_id = NULL;
1945 	}
1946 	free(id_str);
1947 	free(path);
1948 	return err;
1949 }
1950 
1951 const struct got_error *
1952 got_repo_match_object_id_prefix(struct got_object_id **id,
1953     const char *id_str_prefix, int obj_type, struct got_repository *repo)
1954 {
1955 	const struct got_error *err = NULL;
1956 	char *path_objects = NULL, *object_dir = NULL;
1957 	size_t len;
1958 	int i;
1959 
1960 	*id = NULL;
1961 
1962 	path_objects = got_repo_get_path_objects(repo);
1963 
1964 	len = strlen(id_str_prefix);
1965 	if (len > SHA1_DIGEST_STRING_LENGTH - 1) {
1966 		err = got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
1967 		goto done;
1968 	}
1969 
1970 	for (i = 0; i < len; i++) {
1971 		if (isxdigit((unsigned char)id_str_prefix[i]))
1972 			continue;
1973 		err = got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
1974 		goto done;
1975 	}
1976 
1977 	if (len >= 2) {
1978 		err = match_packed_object(id, repo, id_str_prefix, obj_type);
1979 		if (err)
1980 			goto done;
1981 		object_dir = strndup(id_str_prefix, 2);
1982 		if (object_dir == NULL) {
1983 			err = got_error_from_errno("strdup");
1984 			goto done;
1985 		}
1986 		err = match_loose_object(id, path_objects, object_dir,
1987 		    id_str_prefix, obj_type, repo);
1988 	} else if (len == 1) {
1989 		int i;
1990 		for (i = 0; i < 0xf; i++) {
1991 			if (asprintf(&object_dir, "%s%.1x", id_str_prefix, i)
1992 			    == -1) {
1993 				err = got_error_from_errno("asprintf");
1994 				goto done;
1995 			}
1996 			err = match_packed_object(id, repo, object_dir,
1997 			    obj_type);
1998 			if (err)
1999 				goto done;
2000 			err = match_loose_object(id, path_objects, object_dir,
2001 			    id_str_prefix, obj_type, repo);
2002 			if (err)
2003 				goto done;
2004 		}
2005 	} else {
2006 		err = got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
2007 		goto done;
2008 	}
2009 done:
2010 	free(path_objects);
2011 	free(object_dir);
2012 	if (err) {
2013 		free(*id);
2014 		*id = NULL;
2015 	} else if (*id == NULL) {
2016 		switch (obj_type) {
2017 		case GOT_OBJ_TYPE_BLOB:
2018 			err = got_error_fmt(GOT_ERR_NO_OBJ, "%s %s",
2019 			    GOT_OBJ_LABEL_BLOB, id_str_prefix);
2020 			break;
2021 		case GOT_OBJ_TYPE_TREE:
2022 			err = got_error_fmt(GOT_ERR_NO_OBJ, "%s %s",
2023 			    GOT_OBJ_LABEL_TREE, id_str_prefix);
2024 			break;
2025 		case GOT_OBJ_TYPE_COMMIT:
2026 			err = got_error_fmt(GOT_ERR_NO_OBJ, "%s %s",
2027 			    GOT_OBJ_LABEL_COMMIT, id_str_prefix);
2028 			break;
2029 		case GOT_OBJ_TYPE_TAG:
2030 			err = got_error_fmt(GOT_ERR_NO_OBJ, "%s %s",
2031 			    GOT_OBJ_LABEL_TAG, id_str_prefix);
2032 			break;
2033 		default:
2034 			err = got_error_path(id_str_prefix, GOT_ERR_NO_OBJ);
2035 			break;
2036 		}
2037 	}
2038 
2039 	return err;
2040 }
2041 
2042 const struct got_error *
2043 got_repo_match_object_id(struct got_object_id **id, char **label,
2044     const char *id_str, int obj_type, struct got_reflist_head *refs,
2045     struct got_repository *repo)
2046 {
2047 	const struct got_error *err;
2048 	struct got_tag_object *tag;
2049 	struct got_reference *ref = NULL;
2050 
2051 	*id = NULL;
2052 	if (label)
2053 		*label = NULL;
2054 
2055 	if (refs) {
2056 		err = got_repo_object_match_tag(&tag, id_str, obj_type,
2057 		    refs, repo);
2058 		if (err == NULL) {
2059 			*id = got_object_id_dup(
2060 			    got_object_tag_get_object_id(tag));
2061 			if (*id == NULL)
2062 				err = got_error_from_errno("got_object_id_dup");
2063 			else if (label && asprintf(label, "refs/tags/%s",
2064 			    got_object_tag_get_name(tag)) == -1) {
2065 				err = got_error_from_errno("asprintf");
2066 				free(*id);
2067 				*id = NULL;
2068 			}
2069 			got_object_tag_close(tag);
2070 			return err;
2071 		} else if (err->code != GOT_ERR_OBJ_TYPE &&
2072 		    err->code != GOT_ERR_NO_OBJ)
2073 			return err;
2074 	}
2075 
2076 	err = got_ref_open(&ref, repo, id_str, 0);
2077 	if (err == NULL) {
2078 		err = got_ref_resolve(id, repo, ref);
2079 		if (err)
2080 			goto done;
2081 		if (label) {
2082 			*label = strdup(got_ref_get_name(ref));
2083 			if (*label == NULL) {
2084 				err = got_error_from_errno("strdup");
2085 				goto done;
2086 			}
2087 		}
2088 	} else {
2089 		if (err->code != GOT_ERR_NOT_REF &&
2090 		    err->code != GOT_ERR_BAD_REF_NAME)
2091 			goto done;
2092 		err = got_repo_match_object_id_prefix(id, id_str,
2093 		    obj_type, repo);
2094 		if (err) {
2095 			if (err->code == GOT_ERR_BAD_OBJ_ID_STR)
2096 				err = got_error_not_ref(id_str);
2097 			goto done;
2098 		}
2099 		if (label) {
2100 			err = got_object_id_str(label, *id);
2101 			if (*label == NULL) {
2102 				err = got_error_from_errno("strdup");
2103 				goto done;
2104 			}
2105 		}
2106 	}
2107 done:
2108 	if (ref)
2109 		got_ref_close(ref);
2110 	return err;
2111 }
2112 
2113 const struct got_error *
2114 got_repo_object_match_tag(struct got_tag_object **tag, const char *name,
2115     int obj_type, struct got_reflist_head *refs, struct got_repository *repo)
2116 {
2117 	const struct got_error *err = NULL;
2118 	struct got_reflist_entry *re;
2119 	struct got_object_id *tag_id;
2120 	int name_is_absolute = (strncmp(name, "refs/", 5) == 0);
2121 
2122 	*tag = NULL;
2123 
2124 	TAILQ_FOREACH(re, refs, entry) {
2125 		const char *refname;
2126 		refname = got_ref_get_name(re->ref);
2127 		if (got_ref_is_symbolic(re->ref))
2128 			continue;
2129 		if (strncmp(refname, "refs/tags/", 10) != 0)
2130 			continue;
2131 		if (!name_is_absolute)
2132 			refname += strlen("refs/tags/");
2133 		if (strcmp(refname, name) != 0)
2134 			continue;
2135 		err = got_ref_resolve(&tag_id, repo, re->ref);
2136 		if (err)
2137 			break;
2138 		err = got_object_open_as_tag(tag, repo, tag_id);
2139 		free(tag_id);
2140 		if (err)
2141 			break;
2142 		if (obj_type == GOT_OBJ_TYPE_ANY ||
2143 		    got_object_tag_get_object_type(*tag) == obj_type)
2144 			break;
2145 		got_object_tag_close(*tag);
2146 		*tag = NULL;
2147 	}
2148 
2149 	if (err == NULL && *tag == NULL)
2150 		err = got_error_fmt(GOT_ERR_NO_OBJ, "%s %s",
2151 		    GOT_OBJ_LABEL_TAG, name);
2152 	return err;
2153 }
2154 
2155 const struct got_error *
2156 got_repo_find_object_id(struct got_object_id *id, struct got_repository *repo)
2157 {
2158 	const struct got_error *err;
2159 	struct got_object_id *matched_id = NULL;
2160 	char *id_str = NULL;
2161 
2162 	err = got_object_id_str(&id_str, id);
2163 	if (err)
2164 		return err;
2165 
2166 	err = got_repo_match_object_id_prefix(&matched_id, id_str,
2167 	    GOT_OBJ_TYPE_ANY, repo);
2168 	free(id_str);
2169 	return err;
2170 }
2171 
2172 static const struct got_error *
2173 alloc_added_blob_tree_entry(struct got_tree_entry **new_te,
2174     const char *name, mode_t mode, struct got_object_id *blob_id)
2175 {
2176 	const struct got_error *err = NULL;
2177 
2178 	*new_te = NULL;
2179 
2180 	*new_te = calloc(1, sizeof(**new_te));
2181 	if (*new_te == NULL)
2182 		return got_error_from_errno("calloc");
2183 
2184 	if (strlcpy((*new_te)->name, name, sizeof((*new_te)->name)) >=
2185 	    sizeof((*new_te)->name)) {
2186 		err = got_error(GOT_ERR_NO_SPACE);
2187 		goto done;
2188 	}
2189 
2190 	if (S_ISLNK(mode)) {
2191 		(*new_te)->mode = S_IFLNK;
2192 	} else {
2193 		(*new_te)->mode = S_IFREG;
2194 		(*new_te)->mode |= (mode & (S_IRWXU | S_IRWXG | S_IRWXO));
2195 	}
2196 	memcpy(&(*new_te)->id, blob_id, sizeof((*new_te)->id));
2197 done:
2198 	if (err && *new_te) {
2199 		free(*new_te);
2200 		*new_te = NULL;
2201 	}
2202 	return err;
2203 }
2204 
2205 static const struct got_error *
2206 import_file(struct got_tree_entry **new_te, struct dirent *de,
2207     const char *path, struct got_repository *repo)
2208 {
2209 	const struct got_error *err;
2210 	struct got_object_id *blob_id = NULL;
2211 	char *filepath;
2212 	struct stat sb;
2213 
2214 	if (asprintf(&filepath, "%s%s%s", path,
2215 	    path[0] == '\0' ? "" : "/", de->d_name) == -1)
2216 		return got_error_from_errno("asprintf");
2217 
2218 	if (lstat(filepath, &sb) != 0) {
2219 		err = got_error_from_errno2("lstat", path);
2220 		goto done;
2221 	}
2222 
2223 	err = got_object_blob_create(&blob_id, filepath, repo);
2224 	if (err)
2225 		goto done;
2226 
2227 	err = alloc_added_blob_tree_entry(new_te, de->d_name, sb.st_mode,
2228 	    blob_id);
2229 done:
2230 	free(filepath);
2231 	if (err)
2232 		free(blob_id);
2233 	return err;
2234 }
2235 
2236 static const struct got_error *
2237 insert_tree_entry(struct got_tree_entry *new_te,
2238     struct got_pathlist_head *paths)
2239 {
2240 	const struct got_error *err = NULL;
2241 	struct got_pathlist_entry *new_pe;
2242 
2243 	err = got_pathlist_insert(&new_pe, paths, new_te->name, new_te);
2244 	if (err)
2245 		return err;
2246 	if (new_pe == NULL)
2247 		return got_error(GOT_ERR_TREE_DUP_ENTRY);
2248 	return NULL;
2249 }
2250 
2251 static const struct got_error *write_tree(struct got_object_id **,
2252     const char *, struct got_pathlist_head *, struct got_repository *,
2253     got_repo_import_cb progress_cb, void *progress_arg);
2254 
2255 static const struct got_error *
2256 import_subdir(struct got_tree_entry **new_te, struct dirent *de,
2257     const char *path, struct got_pathlist_head *ignores,
2258     struct got_repository *repo,
2259     got_repo_import_cb progress_cb, void *progress_arg)
2260 {
2261 	const struct got_error *err;
2262 	struct got_object_id *id = NULL;
2263 	char *subdirpath;
2264 
2265 	if (asprintf(&subdirpath, "%s%s%s", path,
2266 	    path[0] == '\0' ? "" : "/", de->d_name) == -1)
2267 		return got_error_from_errno("asprintf");
2268 
2269 	(*new_te) = calloc(1, sizeof(**new_te));
2270 	if (*new_te == NULL)
2271 		return got_error_from_errno("calloc");
2272 	(*new_te)->mode = S_IFDIR;
2273 	if (strlcpy((*new_te)->name, de->d_name, sizeof((*new_te)->name)) >=
2274 	    sizeof((*new_te)->name)) {
2275 		err = got_error(GOT_ERR_NO_SPACE);
2276 		goto done;
2277 	}
2278 	err = write_tree(&id, subdirpath, ignores,  repo,
2279 	    progress_cb, progress_arg);
2280 	if (err)
2281 		goto done;
2282 	memcpy(&(*new_te)->id, id, sizeof((*new_te)->id));
2283 
2284 done:
2285 	free(id);
2286 	free(subdirpath);
2287 	if (err) {
2288 		free(*new_te);
2289 		*new_te = NULL;
2290 	}
2291 	return err;
2292 }
2293 
2294 static const struct got_error *
2295 write_tree(struct got_object_id **new_tree_id, const char *path_dir,
2296     struct got_pathlist_head *ignores, struct got_repository *repo,
2297     got_repo_import_cb progress_cb, void *progress_arg)
2298 {
2299 	const struct got_error *err = NULL;
2300 	DIR *dir;
2301 	struct dirent *de;
2302 	int nentries;
2303 	struct got_tree_entry *new_te = NULL;
2304 	struct got_pathlist_head paths;
2305 	struct got_pathlist_entry *pe;
2306 
2307 	*new_tree_id = NULL;
2308 
2309 	TAILQ_INIT(&paths);
2310 
2311 	dir = opendir(path_dir);
2312 	if (dir == NULL) {
2313 		err = got_error_from_errno2("opendir", path_dir);
2314 		goto done;
2315 	}
2316 
2317 	nentries = 0;
2318 	while ((de = readdir(dir)) != NULL) {
2319 		int ignore = 0;
2320 		int type;
2321 
2322 		if (strcmp(de->d_name, ".") == 0 ||
2323 		    strcmp(de->d_name, "..") == 0)
2324 			continue;
2325 
2326 		err = got_path_dirent_type(&type, path_dir, de);
2327 		if (err)
2328 			goto done;
2329 
2330 		TAILQ_FOREACH(pe, ignores, entry) {
2331 			if (type == DT_DIR && pe->path_len > 0 &&
2332 			    pe->path[pe->path_len - 1] == '/') {
2333 				char stripped[PATH_MAX];
2334 
2335 				if (strlcpy(stripped, pe->path,
2336 				    sizeof(stripped)) >= sizeof(stripped)) {
2337 					err = got_error(GOT_ERR_NO_SPACE);
2338 					goto done;
2339 				}
2340 				got_path_strip_trailing_slashes(stripped);
2341 				if (fnmatch(stripped, de->d_name, 0) == 0) {
2342 					ignore = 1;
2343 					break;
2344 				}
2345 			} else if (fnmatch(pe->path, de->d_name, 0) == 0) {
2346 				ignore = 1;
2347 				break;
2348 			}
2349 		}
2350 		if (ignore)
2351 			continue;
2352 
2353 		if (type == DT_DIR) {
2354 			err = import_subdir(&new_te, de, path_dir,
2355 			    ignores, repo, progress_cb, progress_arg);
2356 			if (err) {
2357 				if (err->code != GOT_ERR_NO_TREE_ENTRY)
2358 					goto done;
2359 				err = NULL;
2360 				continue;
2361 			}
2362 		} else if (type == DT_REG || type == DT_LNK) {
2363 			err = import_file(&new_te, de, path_dir, repo);
2364 			if (err)
2365 				goto done;
2366 		} else
2367 			continue;
2368 
2369 		err = insert_tree_entry(new_te, &paths);
2370 		if (err)
2371 			goto done;
2372 		nentries++;
2373 	}
2374 
2375 	if (TAILQ_EMPTY(&paths)) {
2376 		err = got_error_msg(GOT_ERR_NO_TREE_ENTRY,
2377 		    "cannot create tree without any entries");
2378 		goto done;
2379 	}
2380 
2381 	TAILQ_FOREACH(pe, &paths, entry) {
2382 		struct got_tree_entry *te = pe->data;
2383 		char *path;
2384 		if (!S_ISREG(te->mode) && !S_ISLNK(te->mode))
2385 			continue;
2386 		if (asprintf(&path, "%s/%s", path_dir, pe->path) == -1) {
2387 			err = got_error_from_errno("asprintf");
2388 			goto done;
2389 		}
2390 		err = (*progress_cb)(progress_arg, path);
2391 		free(path);
2392 		if (err)
2393 			goto done;
2394 	}
2395 
2396 	err = got_object_tree_create(new_tree_id, &paths, nentries, repo);
2397 done:
2398 	if (dir)
2399 		closedir(dir);
2400 	got_pathlist_free(&paths, GOT_PATHLIST_FREE_NONE);
2401 	return err;
2402 }
2403 
2404 const struct got_error *
2405 got_repo_import(struct got_object_id **new_commit_id, const char *path_dir,
2406     const char *logmsg, const char *author, struct got_pathlist_head *ignores,
2407     struct got_repository *repo, got_repo_import_cb progress_cb,
2408     void *progress_arg)
2409 {
2410 	const struct got_error *err;
2411 	struct got_object_id *new_tree_id;
2412 
2413 	err = write_tree(&new_tree_id, path_dir, ignores, repo,
2414 	    progress_cb, progress_arg);
2415 	if (err)
2416 		return err;
2417 
2418 	err = got_object_commit_create(new_commit_id, new_tree_id, NULL, 0,
2419 	    author, time(NULL), author, time(NULL), logmsg, repo);
2420 	free(new_tree_id);
2421 	return err;
2422 }
2423 
2424 const struct got_error *
2425 got_repo_get_loose_object_info(int *nobjects, off_t *ondisk_size,
2426     struct got_repository *repo)
2427 {
2428 	const struct got_error *err = NULL;
2429 	char *path_objects = NULL, *path = NULL;
2430 	DIR *dir = NULL;
2431 	struct got_object_id id;
2432 	int i;
2433 
2434 	*nobjects = 0;
2435 	*ondisk_size = 0;
2436 
2437 	path_objects = got_repo_get_path_objects(repo);
2438 	if (path_objects == NULL)
2439 		return got_error_from_errno("got_repo_get_path_objects");
2440 
2441 	for (i = 0; i <= 0xff; i++) {
2442 		struct dirent *dent;
2443 
2444 		if (asprintf(&path, "%s/%.2x", path_objects, i) == -1) {
2445 			err = got_error_from_errno("asprintf");
2446 			break;
2447 		}
2448 
2449 		dir = opendir(path);
2450 		if (dir == NULL) {
2451 			if (errno == ENOENT) {
2452 				err = NULL;
2453 				continue;
2454 			}
2455 			err = got_error_from_errno2("opendir", path);
2456 			break;
2457 		}
2458 
2459 		while ((dent = readdir(dir)) != NULL) {
2460 			char *id_str;
2461 			int fd;
2462 			struct stat sb;
2463 
2464 			if (strcmp(dent->d_name, ".") == 0 ||
2465 			    strcmp(dent->d_name, "..") == 0)
2466 				continue;
2467 
2468 			if (asprintf(&id_str, "%.2x%s", i, dent->d_name) == -1) {
2469 				err = got_error_from_errno("asprintf");
2470 				goto done;
2471 			}
2472 
2473 			if (!got_parse_object_id(&id, id_str, repo->algo)) {
2474 				free(id_str);
2475 				continue;
2476 			}
2477 			free(id_str);
2478 
2479 			err = got_object_open_loose_fd(&fd, &id, repo);
2480 			if (err)
2481 				goto done;
2482 
2483 			if (fstat(fd, &sb) == -1) {
2484 				err = got_error_from_errno("fstat");
2485 				close(fd);
2486 				goto done;
2487 			}
2488 			(*nobjects)++;
2489 			(*ondisk_size) += sb.st_size;
2490 
2491 			if (close(fd) == -1) {
2492 				err = got_error_from_errno("close");
2493 				goto done;
2494 			}
2495 		}
2496 
2497 		if (closedir(dir) != 0) {
2498 			err = got_error_from_errno("closedir");
2499 			goto done;
2500 		}
2501 		dir = NULL;
2502 
2503 		free(path);
2504 		path = NULL;
2505 	}
2506 done:
2507 	if (dir && closedir(dir) != 0 && err == NULL)
2508 		err = got_error_from_errno("closedir");
2509 
2510 	if (err) {
2511 		*nobjects = 0;
2512 		*ondisk_size = 0;
2513 	}
2514 	free(path_objects);
2515 	free(path);
2516 	return err;
2517 }
2518 
2519 const struct got_error *
2520 got_repo_get_packfile_info(int *npackfiles, int *nobjects,
2521     off_t *total_packsize, struct got_repository *repo)
2522 {
2523 	const struct got_error *err = NULL;
2524 	DIR *packdir = NULL;
2525 	struct dirent *dent;
2526 	struct got_packidx *packidx = NULL;
2527 	char *path_packidx;
2528 	char *path_packfile;
2529 	int packdir_fd;
2530 	struct stat sb;
2531 
2532 	*npackfiles = 0;
2533 	*nobjects = 0;
2534 	*total_packsize = 0;
2535 
2536 	packdir_fd = openat(got_repo_get_fd(repo),
2537 	    GOT_OBJECTS_PACK_DIR, O_DIRECTORY);
2538 	if (packdir_fd == -1) {
2539 		return got_error_from_errno_fmt("openat: %s/%s",
2540 		    got_repo_get_path_git_dir(repo),
2541 		    GOT_OBJECTS_PACK_DIR);
2542 	}
2543 
2544 	packdir = fdopendir(packdir_fd);
2545 	if (packdir == NULL) {
2546 		err = got_error_from_errno("fdopendir");
2547 		close(packdir_fd);
2548 		goto done;
2549 	}
2550 
2551 	while ((dent = readdir(packdir)) != NULL) {
2552 		if (!got_repo_is_packidx_filename(dent->d_name,
2553 		    strlen(dent->d_name)))
2554 			continue;
2555 
2556 		if (asprintf(&path_packidx, "%s/%s", GOT_OBJECTS_PACK_DIR,
2557 		    dent->d_name) == -1) {
2558 			err = got_error_from_errno("asprintf");
2559 			goto done;
2560 		}
2561 
2562 		err = got_packidx_open(&packidx, got_repo_get_fd(repo),
2563 		    path_packidx, 0);
2564 		free(path_packidx);
2565 		if (err)
2566 			goto done;
2567 
2568 		if (fstat(packidx->fd, &sb) == -1)
2569 			goto done;
2570 		*total_packsize += sb.st_size;
2571 
2572 		err = got_packidx_get_packfile_path(&path_packfile,
2573 		    packidx->path_packidx);
2574 		if (err)
2575 			goto done;
2576 
2577 		if (fstatat(got_repo_get_fd(repo), path_packfile, &sb,
2578 		    0) == -1) {
2579 			free(path_packfile);
2580 			goto done;
2581 		}
2582 		free(path_packfile);
2583 		*total_packsize += sb.st_size;
2584 
2585 		*nobjects += be32toh(packidx->hdr.fanout_table[0xff]);
2586 
2587 		(*npackfiles)++;
2588 
2589 		got_packidx_close(packidx);
2590 		packidx = NULL;
2591 	}
2592 done:
2593 	if (packidx)
2594 		got_packidx_close(packidx);
2595 	if (packdir && closedir(packdir) != 0 && err == NULL)
2596 		err = got_error_from_errno("closedir");
2597 	if (err) {
2598 		*npackfiles = 0;
2599 		*nobjects = 0;
2600 		*total_packsize = 0;
2601 	}
2602 	return err;
2603 }
2604 
2605 RB_GENERATE(got_packidx_bloom_filter_tree, got_packidx_bloom_filter, entry,
2606     got_packidx_bloom_filter_cmp);