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Date:: Tue Jul 23 12:35:00 2019 UTC
Message:: fix path in got_repo_open() error message
Actions:: History | Blame | Raw File
1 /*
2  * Copyright (c) 2018, 2019 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/types.h>
18 #include <sys/queue.h>
19 #include <sys/uio.h>
20 #include <sys/stat.h>
21 #include <sys/mman.h>
22 #include <sys/syslimits.h>
23 
24 #include <ctype.h>
25 #include <fcntl.h>
26 #include <fnmatch.h>
27 #include <limits.h>
28 #include <dirent.h>
29 #include <stdlib.h>
30 #include <stdio.h>
31 #include <sha1.h>
32 #include <string.h>
33 #include <zlib.h>
34 #include <errno.h>
35 #include <libgen.h>
36 #include <stdint.h>
37 #include <imsg.h>
38 #include <uuid.h>
39 
40 #include "got_error.h"
41 #include "got_reference.h"
42 #include "got_repository.h"
43 #include "got_path.h"
44 #include "got_worktree.h"
45 #include "got_object.h"
46 
47 #include "got_lib_delta.h"
48 #include "got_lib_inflate.h"
49 #include "got_lib_object.h"
50 #include "got_lib_object_parse.h"
51 #include "got_lib_object_create.h"
52 #include "got_lib_pack.h"
53 #include "got_lib_privsep.h"
54 #include "got_lib_worktree.h"
55 #include "got_lib_sha1.h"
56 #include "got_lib_object_cache.h"
57 #include "got_lib_repository.h"
58 
59 #ifndef nitems
60 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
61 #endif
62 
63 #define GOT_GIT_DIR	".git"
64 
65 /* Mandatory files and directories inside the git directory. */
66 #define GOT_OBJECTS_DIR		"objects"
67 #define GOT_REFS_DIR		"refs"
68 #define GOT_HEAD_FILE		"HEAD"
69 
70 /* Other files and directories inside the git directory. */
71 #define GOT_FETCH_HEAD_FILE	"FETCH_HEAD"
72 #define GOT_ORIG_HEAD_FILE	"ORIG_HEAD"
73 #define GOT_OBJECTS_PACK_DIR	"objects/pack"
74 #define GOT_PACKED_REFS_FILE	"packed-refs"
75 
76 const char *
77 got_repo_get_path(struct got_repository *repo)
78 {
79 	return repo->path;
80 }
81 
82 const char *
83 got_repo_get_path_git_dir(struct got_repository *repo)
84 {
85 	return repo->path_git_dir;
86 }
87 
88 int
89 got_repo_is_bare(struct got_repository *repo)
90 {
91 	return (strcmp(repo->path, repo->path_git_dir) == 0);
92 }
93 
94 static char *
95 get_path_git_child(struct got_repository *repo, const char *basename)
96 {
97 	char *path_child;
98 	
99 	if (asprintf(&path_child, "%s/%s", repo->path_git_dir,
100 	    basename) == -1)
101 		return NULL;
102 
103 	return path_child;
104 }
105 
106 char *
107 got_repo_get_path_objects(struct got_repository *repo)
108 {
109 	return get_path_git_child(repo, GOT_OBJECTS_DIR);
110 }
111 
112 char *
113 got_repo_get_path_objects_pack(struct got_repository *repo)
114 {
115 	return get_path_git_child(repo, GOT_OBJECTS_PACK_DIR);
116 }
117 
118 char *
119 got_repo_get_path_refs(struct got_repository *repo)
120 {
121 	return get_path_git_child(repo, GOT_REFS_DIR);
122 }
123 
124 char *
125 got_repo_get_path_packed_refs(struct got_repository *repo)
126 {
127 	return get_path_git_child(repo, GOT_PACKED_REFS_FILE);
128 }
129 
130 static char *
131 get_path_head(struct got_repository *repo)
132 {
133 	return get_path_git_child(repo, GOT_HEAD_FILE);
134 }
135 
136 static int
137 is_git_repo(struct got_repository *repo)
138 {
139 	const char *path_git = got_repo_get_path_git_dir(repo);
140 	char *path_objects = got_repo_get_path_objects(repo);
141 	char *path_refs = got_repo_get_path_refs(repo);
142 	char *path_head = get_path_head(repo);
143 	int ret = 0;
144 	struct stat sb;
145 	struct got_reference *head_ref;
146 
147 	if (lstat(path_git, &sb) == -1)
148 		goto done;
149 	if (!S_ISDIR(sb.st_mode))
150 		goto done;
151 
152 	if (lstat(path_objects, &sb) == -1)
153 		goto done;
154 	if (!S_ISDIR(sb.st_mode))
155 		goto done;
156 
157 	if (lstat(path_refs, &sb) == -1)
158 		goto done;
159 	if (!S_ISDIR(sb.st_mode))
160 		goto done;
161 
162 	if (lstat(path_head, &sb) == -1)
163 		goto done;
164 	if (!S_ISREG(sb.st_mode))
165 		goto done;
166 
167 	/* Check if the HEAD reference can be opened. */
168 	if (got_ref_open(&head_ref, repo, GOT_REF_HEAD, 0) != NULL)
169 		goto done;
170 	got_ref_close(head_ref);
171 
172 	ret = 1;
173 done:
174 	free(path_objects);
175 	free(path_refs);
176 	free(path_head);
177 	return ret;
178 
179 }
180 
181 const struct got_error *
182 got_repo_cache_object(struct got_repository *repo, struct got_object_id *id,
183     struct got_object *obj)
184 {
185 #ifndef GOT_NO_OBJ_CACHE
186 	const struct got_error *err = NULL;
187 	err = got_object_cache_add(&repo->objcache, id, obj);
188 	if (err) {
189 		if (err->code == GOT_ERR_OBJ_EXISTS ||
190 		    err->code == GOT_ERR_OBJ_TOO_LARGE)
191 			err = NULL;
192 		return err;
193 	}
194 	obj->refcnt++;
195 #endif
196 	return NULL;
197 }
198 
199 struct got_object *
200 got_repo_get_cached_object(struct got_repository *repo,
201     struct got_object_id *id)
202 {
203 	return (struct got_object *)got_object_cache_get(&repo->objcache, id);
204 }
205 
206 const struct got_error *
207 got_repo_cache_tree(struct got_repository *repo, struct got_object_id *id,
208     struct got_tree_object *tree)
209 {
210 #ifndef GOT_NO_OBJ_CACHE
211 	const struct got_error *err = NULL;
212 	err = got_object_cache_add(&repo->treecache, id, tree);
213 	if (err) {
214 		if (err->code == GOT_ERR_OBJ_EXISTS ||
215 		    err->code == GOT_ERR_OBJ_TOO_LARGE)
216 			err = NULL;
217 		return err;
218 	}
219 	tree->refcnt++;
220 #endif
221 	return NULL;
222 }
223 
224 struct got_tree_object *
225 got_repo_get_cached_tree(struct got_repository *repo,
226     struct got_object_id *id)
227 {
228 	return (struct got_tree_object *)got_object_cache_get(
229 	    &repo->treecache, id);
230 }
231 
232 const struct got_error *
233 got_repo_cache_commit(struct got_repository *repo, struct got_object_id *id,
234     struct got_commit_object *commit)
235 {
236 #ifndef GOT_NO_OBJ_CACHE
237 	const struct got_error *err = NULL;
238 	err = got_object_cache_add(&repo->commitcache, id, commit);
239 	if (err) {
240 		if (err->code == GOT_ERR_OBJ_EXISTS ||
241 		    err->code == GOT_ERR_OBJ_TOO_LARGE)
242 			err = NULL;
243 		return err;
244 	}
245 	commit->refcnt++;
246 #endif
247 	return NULL;
248 }
249 
250 struct got_commit_object *
251 got_repo_get_cached_commit(struct got_repository *repo,
252     struct got_object_id *id)
253 {
254 	return (struct got_commit_object *)got_object_cache_get(
255 	    &repo->commitcache, id);
256 }
257 
258 const struct got_error *
259 got_repo_cache_tag(struct got_repository *repo, struct got_object_id *id,
260     struct got_tag_object *tag)
261 {
262 #ifndef GOT_NO_OBJ_CACHE
263 	const struct got_error *err = NULL;
264 	err = got_object_cache_add(&repo->tagcache, id, tag);
265 	if (err) {
266 		if (err->code == GOT_ERR_OBJ_EXISTS ||
267 		    err->code == GOT_ERR_OBJ_TOO_LARGE)
268 			err = NULL;
269 		return err;
270 	}
271 	tag->refcnt++;
272 #endif
273 	return NULL;
274 }
275 
276 struct got_tag_object *
277 got_repo_get_cached_tag(struct got_repository *repo, struct got_object_id *id)
278 {
279 	return (struct got_tag_object *)got_object_cache_get(
280 	    &repo->tagcache, id);
281 }
282 
283 const struct got_error *
284 open_repo(struct got_repository *repo, const char *path)
285 {
286 	const struct got_error *err = NULL;
287 
288 	/* bare git repository? */
289 	repo->path_git_dir = strdup(path);
290 	if (repo->path_git_dir == NULL)
291 		return got_error_from_errno("strdup");
292 	if (is_git_repo(repo)) {
293 		repo->path = strdup(repo->path_git_dir);
294 		if (repo->path == NULL) {
295 			err = got_error_from_errno("strdup");
296 			goto done;
297 		}
298 		return NULL;
299 	}
300 
301 	/* git repository with working tree? */
302 	free(repo->path_git_dir);
303 	if (asprintf(&repo->path_git_dir, "%s/%s", path, GOT_GIT_DIR) == -1) {
304 		err = got_error_from_errno("asprintf");
305 		goto done;
306 	}
307 	if (is_git_repo(repo)) {
308 		repo->path = strdup(path);
309 		if (repo->path == NULL) {
310 			err = got_error_from_errno("strdup");
311 			goto done;
312 		}
313 		return NULL;
314 	}
315 
316 	err = got_error(GOT_ERR_NOT_GIT_REPO);
317 done:
318 	if (err) {
319 		free(repo->path);
320 		repo->path = NULL;
321 		free(repo->path_git_dir);
322 		repo->path_git_dir = NULL;
323 	}
324 	return err;
325 }
326 
327 const struct got_error *
328 got_repo_open(struct got_repository **repop, const char *path)
329 {
330 	struct got_repository *repo = NULL;
331 	const struct got_error *err = NULL;
332 	char *abspath;
333 	int i, tried_root = 0;
334 
335 	*repop = NULL;
336 
337 	if (got_path_is_absolute(path))
338 		abspath = strdup(path);
339 	else
340 		abspath = got_path_get_absolute(path);
341 	if (abspath == NULL)
342 		return got_error(GOT_ERR_BAD_PATH);
343 
344 	repo = calloc(1, sizeof(*repo));
345 	if (repo == NULL) {
346 		err = got_error_from_errno("calloc");
347 		goto done;
348 	}
349 
350 	for (i = 0; i < nitems(repo->privsep_children); i++) {
351 		memset(&repo->privsep_children[i], 0,
352 		    sizeof(repo->privsep_children[0]));
353 		repo->privsep_children[i].imsg_fd = -1;
354 	}
355 
356 	err = got_object_cache_init(&repo->objcache,
357 	    GOT_OBJECT_CACHE_TYPE_OBJ);
358 	if (err)
359 		goto done;
360 	err = got_object_cache_init(&repo->treecache,
361 	    GOT_OBJECT_CACHE_TYPE_TREE);
362 	if (err)
363 		goto done;
364 	err = got_object_cache_init(&repo->commitcache,
365 	    GOT_OBJECT_CACHE_TYPE_COMMIT);
366 	if (err)
367 		goto done;
368 	err = got_object_cache_init(&repo->tagcache,
369 	    GOT_OBJECT_CACHE_TYPE_TAG);
370 	if (err)
371 		goto done;
372 
373 	path = realpath(abspath, NULL);
374 	if (path == NULL) {
375 		err = got_error_from_errno2("realpath", abspath);
376 		goto done;
377 	}
378 
379 	do {
380 		err = open_repo(repo, path);
381 		if (err == NULL)
382 			break;
383 		if (err->code != GOT_ERR_NOT_GIT_REPO)
384 			break;
385 		if (path[0] == '/' && path[1] == '\0') {
386 			if (tried_root) {
387 				err = got_error(GOT_ERR_NOT_GIT_REPO);
388 				break;
389 			}
390 			tried_root = 1;
391 		}
392 		path = dirname(path);
393 		if (path == NULL)
394 			err = got_error_from_errno2("dirname", path);
395 	} while (path);
396 done:
397 	if (err)
398 		got_repo_close(repo);
399 	else
400 		*repop = repo;
401 	free(abspath);
402 	return err;
403 }
404 
405 const struct got_error *
406 got_repo_close(struct got_repository *repo)
407 {
408 	const struct got_error *err = NULL, *child_err;
409 	int i;
410 
411 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
412 		if (repo->packidx_cache[i] == NULL)
413 			break;
414 		got_packidx_close(repo->packidx_cache[i]);
415 	}
416 
417 	for (i = 0; i < nitems(repo->packs); i++) {
418 		if (repo->packs[i].path_packfile == NULL)
419 			break;
420 		got_pack_close(&repo->packs[i]);
421 	}
422 
423 	free(repo->path);
424 	free(repo->path_git_dir);
425 
426 	got_object_cache_close(&repo->objcache);
427 	got_object_cache_close(&repo->treecache);
428 	got_object_cache_close(&repo->commitcache);
429 	got_object_cache_close(&repo->tagcache);
430 
431 	for (i = 0; i < nitems(repo->privsep_children); i++) {
432 		if (repo->privsep_children[i].imsg_fd == -1)
433 			continue;
434 		imsg_clear(repo->privsep_children[i].ibuf);
435 		free(repo->privsep_children[i].ibuf);
436 		err = got_privsep_send_stop(repo->privsep_children[i].imsg_fd);
437 		child_err = got_privsep_wait_for_child(
438 		    repo->privsep_children[i].pid);
439 		if (child_err && err == NULL)
440 			err = child_err;
441 		if (close(repo->privsep_children[i].imsg_fd) != 0 &&
442 		    err == NULL)
443 			err = got_error_from_errno("close");
444 	}
445 	free(repo);
446 
447 	return err;
448 }
449 
450 const struct got_error *
451 got_repo_map_path(char **in_repo_path, struct got_repository *repo,
452     const char *input_path, int check_disk)
453 {
454 	const struct got_error *err = NULL;
455 	const char *repo_abspath = NULL;
456 	size_t repolen, cwdlen, len;
457 	char *cwd, *canonpath, *path = NULL;
458 
459 	*in_repo_path = NULL;
460 
461 	cwd = getcwd(NULL, 0);
462 	if (cwd == NULL)
463 		return got_error_from_errno("getcwd");
464 
465 	canonpath = strdup(input_path);
466 	if (canonpath == NULL) {
467 		err = got_error_from_errno("strdup");
468 		goto done;
469 	}
470 	err = got_canonpath(input_path, canonpath, strlen(canonpath) + 1);
471 	if (err)
472 		goto done;
473 
474 	repo_abspath = got_repo_get_path(repo);
475 
476 	if (!check_disk || canonpath[0] == '\0') {
477 		path = strdup(canonpath);
478 		if (path == NULL) {
479 			err = got_error_from_errno("strdup");
480 			goto done;
481 		}
482 	} else {
483 		int is_repo_child = 0, is_cwd_child = 0;
484 
485 		path = realpath(canonpath, NULL);
486 		if (path == NULL) {
487 			if (errno != ENOENT) {
488 				err = got_error_from_errno2("realpath",
489 				    canonpath);
490 				goto done;
491 			}
492 			/*
493 			 * Path is not on disk.
494 			 * Assume it is already relative to repository root.
495 			 */
496 			path = strdup(canonpath);
497 			if (path == NULL) {
498 				err = got_error_from_errno("strdup");
499 				goto done;
500 			}
501 		}
502 
503 		repolen = strlen(repo_abspath);
504 		cwdlen = strlen(cwd);
505 		len = strlen(path);
506 
507 		if (len > repolen && strncmp(path, repo_abspath, repolen) == 0)
508 			is_repo_child = 1;
509 		if (len > cwdlen && strncmp(path, cwd, cwdlen) == 0)
510 			is_cwd_child = 1;
511 
512 		if (strcmp(path, repo_abspath) == 0) {
513 			free(path);
514 			path = strdup("");
515 			if (path == NULL) {
516 				err = got_error_from_errno("strdup");
517 				goto done;
518 			}
519 		} else if (is_repo_child && is_cwd_child) {
520 			char *child;
521 			/* Strip common prefix with repository path. */
522 			err = got_path_skip_common_ancestor(&child,
523 			    repo_abspath, path);
524 			if (err)
525 				goto done;
526 			free(path);
527 			path = child;
528 		} else if (is_repo_child) {
529 			/* Matched an on-disk path inside repository. */
530 			if (got_repo_is_bare(repo)) {
531 				/*
532 				 * Matched an on-disk path inside repository
533 				 * database. Treat as repository-relative.
534 				 */
535 			} else {
536 				char *child;
537 				/* Strip common prefix with repository path. */
538 				err = got_path_skip_common_ancestor(&child,
539 				    repo_abspath, path);
540 				if (err)
541 					goto done;
542 				free(path);
543 				path = child;
544 			}
545 		} else if (is_cwd_child) {
546 			char *child;
547 			/* Strip common prefix with cwd. */
548 			err = got_path_skip_common_ancestor(&child, cwd,
549 			    path);
550 			if (err)
551 				goto done;
552 			free(path);
553 			path = child;
554 		} else {
555 			/*
556 			 * Matched unrelated on-disk path.
557 			 * Treat it as repository-relative.
558 			 */
559 		}
560 	}
561 
562 	/* Make in-repository path absolute */
563 	if (path[0] != '/') {
564 		char *abspath;
565 		if (asprintf(&abspath, "/%s", path) == -1) {
566 			err = got_error_from_errno("asprintf");
567 			goto done;
568 		}
569 		free(path);
570 		path = abspath;
571 	}
572 
573 done:
574 	free(cwd);
575 	free(canonpath);
576 	if (err)
577 		free(path);
578 	else
579 		*in_repo_path = path;
580 	return err;
581 }
582 
583 const struct got_error *
584 got_repo_cache_packidx(struct got_repository *repo, struct got_packidx *packidx)
585 {
586 	const struct got_error *err = NULL;
587 	int i;
588 
589 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
590 		if (repo->packidx_cache[i] == NULL)
591 			break;
592 	}
593 	if (i == nitems(repo->packidx_cache)) {
594 		err = got_packidx_close(repo->packidx_cache[i - 1]);
595 		if (err)
596 			return err;
597 	}
598 
599 	/*
600 	 * Insert the new pack index at the front so it will
601 	 * be searched first in the future.
602 	 */
603 	memmove(&repo->packidx_cache[1], &repo->packidx_cache[0],
604 	    sizeof(repo->packidx_cache) -
605 	    sizeof(repo->packidx_cache[0]));
606 	repo->packidx_cache[0] = packidx;
607 
608 	return NULL;
609 }
610 
611 static int
612 is_packidx_filename(const char *name, size_t len)
613 {
614 	if (len != GOT_PACKIDX_NAMELEN)
615 		return 0;
616 
617 	if (strncmp(name, GOT_PACK_PREFIX, strlen(GOT_PACK_PREFIX)) != 0)
618 		return 0;
619 
620 	if (strcmp(name + strlen(GOT_PACK_PREFIX) +
621 	    SHA1_DIGEST_STRING_LENGTH - 1, GOT_PACKIDX_SUFFIX) != 0)
622 		return 0;
623 
624 	return 1;
625 }
626 
627 const struct got_error *
628 got_repo_search_packidx(struct got_packidx **packidx, int *idx,
629     struct got_repository *repo, struct got_object_id *id)
630 {
631 	const struct got_error *err;
632 	char *path_packdir;
633 	DIR *packdir;
634 	struct dirent *dent;
635 	char *path_packidx;
636 	int i;
637 
638 	/* Search pack index cache. */
639 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
640 		if (repo->packidx_cache[i] == NULL)
641 			break;
642 		*idx = got_packidx_get_object_idx(repo->packidx_cache[i], id);
643 		if (*idx != -1) {
644 			*packidx = repo->packidx_cache[i];
645 			return NULL;
646 		}
647 	}
648 	/* No luck. Search the filesystem. */
649 
650 	path_packdir = got_repo_get_path_objects_pack(repo);
651 	if (path_packdir == NULL)
652 		return got_error_from_errno("got_repo_get_path_objects_pack");
653 
654 	packdir = opendir(path_packdir);
655 	if (packdir == NULL) {
656 		err = got_error_from_errno2("opendir", path_packdir);
657 		goto done;
658 	}
659 
660 	while ((dent = readdir(packdir)) != NULL) {
661 		if (!is_packidx_filename(dent->d_name, dent->d_namlen))
662 			continue;
663 
664 		if (asprintf(&path_packidx, "%s/%s", path_packdir,
665 		    dent->d_name) == -1) {
666 			err = got_error_from_errno("asprintf");
667 			goto done;
668 		}
669 
670 		err = got_packidx_open(packidx, path_packidx, 0);
671 		free(path_packidx);
672 		if (err)
673 			goto done;
674 
675 		*idx = got_packidx_get_object_idx(*packidx, id);
676 		if (*idx != -1) {
677 			err = NULL; /* found the object */
678 			err = got_repo_cache_packidx(repo, *packidx);
679 			goto done;
680 		}
681 
682 		err = got_packidx_close(*packidx);
683 		*packidx = NULL;
684 		if (err)
685 			goto done;
686 	}
687 
688 	err = got_error_no_obj(id);
689 done:
690 	free(path_packdir);
691 	if (packdir && closedir(packdir) != 0 && err == NULL)
692 		err = got_error_from_errno("closedir");
693 	return err;
694 }
695 
696 static const struct got_error *
697 read_packfile_hdr(int fd, struct got_packidx *packidx)
698 {
699 	const struct got_error *err = NULL;
700 	uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
701 	struct got_packfile_hdr hdr;
702 	ssize_t n;
703 
704 	n = read(fd, &hdr, sizeof(hdr));
705 	if (n < 0)
706 		return got_error_from_errno("read");
707 	if (n != sizeof(hdr))
708 		return got_error(GOT_ERR_BAD_PACKFILE);
709 
710 	if (betoh32(hdr.signature) != GOT_PACKFILE_SIGNATURE ||
711 	    betoh32(hdr.version) != GOT_PACKFILE_VERSION ||
712 	    betoh32(hdr.nobjects) != totobj)
713 		err = got_error(GOT_ERR_BAD_PACKFILE);
714 
715 	return err;
716 }
717 
718 static const struct got_error *
719 open_packfile(int *fd, const char *path_packfile, struct got_packidx *packidx)
720 {
721 	const struct got_error *err = NULL;
722 
723 	*fd = open(path_packfile, O_RDONLY | O_NOFOLLOW);
724 	if (*fd == -1)
725 		return got_error_from_errno2("open", path_packfile);
726 
727 	if (packidx) {
728 		err = read_packfile_hdr(*fd, packidx);
729 		if (err) {
730 			close(*fd);
731 			*fd = -1;
732 		}
733 	}
734 
735 	return err;
736 }
737 
738 const struct got_error *
739 got_repo_cache_pack(struct got_pack **packp, struct got_repository *repo,
740     const char *path_packfile, struct got_packidx *packidx)
741 {
742 	const struct got_error *err = NULL;
743 	struct got_pack *pack = NULL;
744 	struct stat sb;
745 	int i;
746 
747 	if (packp)
748 		*packp = NULL;
749 
750 	for (i = 0; i < nitems(repo->packs); i++) {
751 		pack = &repo->packs[i];
752 		if (pack->path_packfile == NULL)
753 			break;
754 		if (strcmp(pack->path_packfile, path_packfile) == 0)
755 			return NULL;
756 	}
757 
758 	if (i == nitems(repo->packs) - 1) {
759 		err = got_pack_close(&repo->packs[i - 1]);
760 		if (err)
761 			return err;
762 		memmove(&repo->packs[1], &repo->packs[0],
763 		    sizeof(repo->packs) - sizeof(repo->packs[0]));
764 		i = 0;
765 	}
766 
767 	pack = &repo->packs[i];
768 
769 	pack->path_packfile = strdup(path_packfile);
770 	if (pack->path_packfile == NULL) {
771 		err = got_error_from_errno("strdup");
772 		goto done;
773 	}
774 
775 	err = open_packfile(&pack->fd, path_packfile, packidx);
776 	if (err)
777 		goto done;
778 
779 	if (fstat(pack->fd, &sb) != 0) {
780 		err = got_error_from_errno("fstat");
781 		goto done;
782 	}
783 	pack->filesize = sb.st_size;
784 
785 	pack->privsep_child = NULL;
786 
787 #ifndef GOT_PACK_NO_MMAP
788 	pack->map = mmap(NULL, pack->filesize, PROT_READ, MAP_PRIVATE,
789 	    pack->fd, 0);
790 	if (pack->map == MAP_FAILED) {
791 		if (errno != ENOMEM) {
792 			err = got_error_from_errno("mmap");
793 			goto done;
794 		}
795 		pack->map = NULL; /* fall back to read(2) */
796 	}
797 #endif
798 done:
799 	if (err) {
800 		if (pack) {
801 			free(pack->path_packfile);
802 			memset(pack, 0, sizeof(*pack));
803 		}
804 	} else if (packp)
805 		*packp = pack;
806 	return err;
807 }
808 
809 struct got_pack *
810 got_repo_get_cached_pack(struct got_repository *repo, const char *path_packfile)
811 {
812 	struct got_pack *pack = NULL;
813 	int i;
814 
815 	for (i = 0; i < nitems(repo->packs); i++) {
816 		pack = &repo->packs[i];
817 		if (pack->path_packfile == NULL)
818 			break;
819 		if (strcmp(pack->path_packfile, path_packfile) == 0)
820 			return pack;
821 	}
822 
823 	return NULL;
824 }
825 
826 const struct got_error *
827 got_repo_init(const char *repo_path)
828 {
829 	const struct got_error *err = NULL;
830 	const char *dirnames[] = {
831 		GOT_OBJECTS_DIR,
832 		GOT_OBJECTS_PACK_DIR,
833 		GOT_REFS_DIR,
834 	};
835 	const char *description_str = "Unnamed repository; "
836 	    "edit this file 'description' to name the repository.";
837 	const char *headref_str = "ref: refs/heads/master";
838 	const char *gitconfig_str = "[core]\n"
839 	    "\trepositoryformatversion = 0\n"
840 	    "\tfilemode = true\n"
841 	    "\tbare = true\n";
842 	char *path;
843 	int i;
844 
845 	if (!got_path_dir_is_empty(repo_path))
846 		return got_error(GOT_ERR_DIR_NOT_EMPTY);
847 
848 	for (i = 0; i < nitems(dirnames); i++) {
849 		if (asprintf(&path, "%s/%s", repo_path, dirnames[i]) == -1) {
850 			return got_error_from_errno("asprintf");
851 		}
852 		err = got_path_mkdir(path);
853 		free(path);
854 		if (err)
855 			return err;
856 	}
857 
858 	if (asprintf(&path, "%s/%s", repo_path, "description") == -1)
859 		return got_error_from_errno("asprintf");
860 	err = got_path_create_file(path, description_str);
861 	free(path);
862 	if (err)
863 		return err;
864 
865 	if (asprintf(&path, "%s/%s", repo_path, GOT_HEAD_FILE) == -1)
866 		return got_error_from_errno("asprintf");
867 	err = got_path_create_file(path, headref_str);
868 	free(path);
869 	if (err)
870 		return err;
871 
872 	if (asprintf(&path, "%s/%s", repo_path, "config") == -1)
873 		return got_error_from_errno("asprintf");
874 	err = got_path_create_file(path, gitconfig_str);
875 	free(path);
876 	if (err)
877 		return err;
878 
879 	return NULL;
880 }
881 
882 static const struct got_error *
883 match_packed_object(struct got_object_id **unique_id,
884     struct got_repository *repo, const char *id_str_prefix, int obj_type)
885 {
886 	const struct got_error *err = NULL;
887 	char *path_packdir;
888 	DIR *packdir;
889 	struct dirent *dent;
890 	char *path_packidx;
891 	struct got_object_id_queue matched_ids;
892 
893 	SIMPLEQ_INIT(&matched_ids);
894 
895 	path_packdir = got_repo_get_path_objects_pack(repo);
896 	if (path_packdir == NULL)
897 		return got_error_from_errno("got_repo_get_path_objects_pack");
898 
899 	packdir = opendir(path_packdir);
900 	if (packdir == NULL) {
901 		err = got_error_from_errno2("opendir", path_packdir);
902 		goto done;
903 	}
904 
905 	while ((dent = readdir(packdir)) != NULL) {
906 		struct got_packidx *packidx;
907 		struct got_object_qid *qid;
908 
909 
910 		if (!is_packidx_filename(dent->d_name, dent->d_namlen))
911 			continue;
912 
913 		if (asprintf(&path_packidx, "%s/%s", path_packdir,
914 		    dent->d_name) == -1) {
915 			err = got_error_from_errno("asprintf");
916 			break;
917 		}
918 
919 		err = got_packidx_open(&packidx, path_packidx, 0);
920 		free(path_packidx);
921 		if (err)
922 			break;
923 
924 		err = got_packidx_match_id_str_prefix(&matched_ids,
925 		    packidx, id_str_prefix);
926 		if (err) {
927 			got_packidx_close(packidx);
928 			break;
929 		}
930 		err = got_packidx_close(packidx);
931 		if (err)
932 			break;
933 
934 		SIMPLEQ_FOREACH(qid, &matched_ids, entry) {
935 			if (obj_type != GOT_OBJ_TYPE_ANY) {
936 				int matched_type;
937 				err = got_object_get_type(&matched_type, repo,
938 				    qid->id);
939 				if (err)
940 					goto done;
941 				if (matched_type != obj_type)
942 					continue;
943 			}
944 			if (*unique_id == NULL) {
945 				*unique_id = got_object_id_dup(qid->id);
946 				if (*unique_id == NULL) {
947 					err = got_error_from_errno("malloc");
948 					goto done;
949 				}
950 			} else {
951 				err = got_error(GOT_ERR_AMBIGUOUS_ID);
952 				goto done;
953 			}
954 		}
955 	}
956 done:
957 	got_object_id_queue_free(&matched_ids);
958 	free(path_packdir);
959 	if (packdir && closedir(packdir) != 0 && err == NULL)
960 		err = got_error_from_errno("closedir");
961 	if (err) {
962 		free(*unique_id);
963 		*unique_id = NULL;
964 	}
965 	return err;
966 }
967 
968 static const struct got_error *
969 match_loose_object(struct got_object_id **unique_id, const char *path_objects,
970     const char *object_dir, const char *id_str_prefix, int obj_type,
971     struct got_repository *repo)
972 {
973 	const struct got_error *err = NULL;
974 	char *path;
975 	DIR *dir = NULL;
976 	struct dirent *dent;
977 	struct got_object_id id;
978 
979 	if (asprintf(&path, "%s/%s", path_objects, object_dir) == -1) {
980 		err = got_error_from_errno("asprintf");
981 		goto done;
982 	}
983 
984 	dir = opendir(path);
985 	if (dir == NULL) {
986 		if (errno == ENOENT) {
987 			err = NULL;
988 			goto done;
989 		}
990 		err = got_error_from_errno2("opendir", path);
991 		goto done;
992 	}
993 	while ((dent = readdir(dir)) != NULL) {
994 		char *id_str;
995 		int cmp;
996 
997 		if (strcmp(dent->d_name, ".") == 0 ||
998 		    strcmp(dent->d_name, "..") == 0)
999 			continue;
1000 
1001 		if (asprintf(&id_str, "%s%s", object_dir, dent->d_name) == -1) {
1002 			err = got_error_from_errno("asprintf");
1003 			goto done;
1004 		}
1005 
1006 		if (!got_parse_sha1_digest(id.sha1, id_str))
1007 			continue;
1008 
1009 		/*
1010 		 * Directory entries do not necessarily appear in
1011 		 * sorted order, so we must iterate over all of them.
1012 		 */
1013 		cmp = strncmp(id_str, id_str_prefix, strlen(id_str_prefix));
1014 		if (cmp != 0) {
1015 			free(id_str);
1016 			continue;
1017 		}
1018 
1019 		if (*unique_id == NULL) {
1020 			if (obj_type != GOT_OBJ_TYPE_ANY) {
1021 				int matched_type;
1022 				err = got_object_get_type(&matched_type, repo,
1023 				    &id);
1024 				if (err)
1025 					goto done;
1026 				if (matched_type != obj_type)
1027 					continue;
1028 			}
1029 			*unique_id = got_object_id_dup(&id);
1030 			if (*unique_id == NULL) {
1031 				err = got_error_from_errno("got_object_id_dup");
1032 				free(id_str);
1033 				goto done;
1034 			}
1035 		} else {
1036 			err = got_error(GOT_ERR_AMBIGUOUS_ID);
1037 			free(id_str);
1038 			goto done;
1039 		}
1040 	}
1041 done:
1042 	if (dir && closedir(dir) != 0 && err == NULL)
1043 		err = got_error_from_errno("closedir");
1044 	if (err) {
1045 		free(*unique_id);
1046 		*unique_id = NULL;
1047 	}
1048 	free(path);
1049 	return err;
1050 }
1051 
1052 const struct got_error *
1053 got_repo_match_object_id_prefix(struct got_object_id **id,
1054     const char *id_str_prefix, int obj_type, struct got_repository *repo)
1055 {
1056 	const struct got_error *err = NULL;
1057 	char *path_objects = got_repo_get_path_objects(repo);
1058 	char *object_dir = NULL;
1059 	size_t len;
1060 	int i;
1061 
1062 	*id = NULL;
1063 
1064 	for (i = 0; i < strlen(id_str_prefix); i++) {
1065 		if (isxdigit((unsigned char)id_str_prefix[i]))
1066 			continue;
1067 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
1068 	}
1069 
1070 	len = strlen(id_str_prefix);
1071 	if (len >= 2) {
1072 		err = match_packed_object(id, repo, id_str_prefix, obj_type);
1073 		if (err)
1074 			goto done;
1075 		object_dir = strndup(id_str_prefix, 2);
1076 		if (object_dir == NULL) {
1077 			err = got_error_from_errno("strdup");
1078 			goto done;
1079 		}
1080 		err = match_loose_object(id, path_objects, object_dir,
1081 		    id_str_prefix, obj_type, repo);
1082 	} else if (len == 1) {
1083 		int i;
1084 		for (i = 0; i < 0xf; i++) {
1085 			if (asprintf(&object_dir, "%s%.1x", id_str_prefix, i)
1086 			    == -1) {
1087 				err = got_error_from_errno("asprintf");
1088 				goto done;
1089 			}
1090 			err = match_packed_object(id, repo, object_dir,
1091 			    obj_type);
1092 			if (err)
1093 				goto done;
1094 			err = match_loose_object(id, path_objects, object_dir,
1095 			    id_str_prefix, obj_type, repo);
1096 			if (err)
1097 				goto done;
1098 		}
1099 	} else {
1100 		err = got_error(GOT_ERR_BAD_OBJ_ID_STR);
1101 		goto done;
1102 	}
1103 done:
1104 	free(object_dir);
1105 	if (err) {
1106 		free(*id);
1107 		*id = NULL;
1108 	} else if (*id == NULL)
1109 		err = got_error(GOT_ERR_NO_OBJ);
1110 
1111 	return err;
1112 }
1113 
1114 static const struct got_error *
1115 alloc_added_blob_tree_entry(struct got_tree_entry **new_te,
1116     const char *name, mode_t mode, struct got_object_id *blob_id)
1117 {
1118 	const struct got_error *err = NULL;
1119 
1120 	 *new_te = NULL;
1121 
1122 	*new_te = calloc(1, sizeof(**new_te));
1123 	if (*new_te == NULL)
1124 		return got_error_from_errno("calloc");
1125 
1126 	(*new_te)->name = strdup(name);
1127 	if ((*new_te)->name == NULL) {
1128 		err = got_error_from_errno("strdup");
1129 		goto done;
1130 	}
1131 
1132 	(*new_te)->mode = S_IFREG | (mode & ((S_IRWXU | S_IRWXG | S_IRWXO)));
1133 	(*new_te)->id = blob_id;
1134 done:
1135 	if (err && *new_te) {
1136 		got_object_tree_entry_close(*new_te);
1137 		*new_te = NULL;
1138 	}
1139 	return err;
1140 }
1141 
1142 static const struct got_error *
1143 import_file(struct got_tree_entry **new_te, struct dirent *de,
1144     const char *path, struct got_repository *repo)
1145 {
1146 	const struct got_error *err;
1147 	struct got_object_id *blob_id = NULL;
1148 	char *filepath;
1149 	struct stat sb;
1150 
1151 	if (asprintf(&filepath, "%s%s%s", path,
1152 	    path[0] == '\0' ? "" : "/", de->d_name) == -1)
1153 		return got_error_from_errno("asprintf");
1154 
1155 	if (lstat(filepath, &sb) != 0) {
1156 		err = got_error_from_errno2("lstat", path);
1157 		goto done;
1158 	}
1159 
1160 	err = got_object_blob_create(&blob_id, filepath, repo);
1161 	if (err)
1162 		goto done;
1163 
1164 	err = alloc_added_blob_tree_entry(new_te, de->d_name, sb.st_mode,
1165 	    blob_id);
1166 done:
1167 	free(filepath);
1168 	if (err)
1169 		free(blob_id);
1170 	return err;
1171 }
1172 
1173 static const struct got_error *
1174 insert_tree_entry(struct got_tree_entry *new_te,
1175     struct got_pathlist_head *paths)
1176 {
1177 	const struct got_error *err = NULL;
1178 	struct got_pathlist_entry *new_pe;
1179 
1180 	err = got_pathlist_insert(&new_pe, paths, new_te->name, new_te);
1181 	if (err)
1182 		return err;
1183 	if (new_pe == NULL)
1184 		return got_error(GOT_ERR_TREE_DUP_ENTRY);
1185 	return NULL;
1186 }
1187 
1188 static const struct got_error *write_tree(struct got_object_id **,
1189     const char *, struct got_pathlist_head *, struct got_repository *,
1190     got_repo_import_cb progress_cb, void *progress_arg);
1191 
1192 static const struct got_error *
1193 import_subdir(struct got_tree_entry **new_te, struct dirent *de,
1194     const char *path, struct got_pathlist_head *ignores,
1195     struct got_repository *repo,
1196     got_repo_import_cb progress_cb, void *progress_arg)
1197 {
1198 	const struct got_error *err;
1199 	char *subdirpath;
1200 
1201 	if (asprintf(&subdirpath, "%s%s%s", path,
1202 	    path[0] == '\0' ? "" : "/", de->d_name) == -1)
1203 		return got_error_from_errno("asprintf");
1204 
1205 	(*new_te) = calloc(1, sizeof(**new_te));
1206 	(*new_te)->mode = S_IFDIR;
1207 	(*new_te)->name = strdup(de->d_name);
1208 	if ((*new_te)->name == NULL) {
1209 		err = got_error_from_errno("strdup");
1210 		goto done;
1211 	}
1212 
1213 	err = write_tree(&(*new_te)->id, subdirpath, ignores,  repo,
1214 	    progress_cb, progress_arg);
1215 done:
1216 	free(subdirpath);
1217 	if (err) {
1218 		got_object_tree_entry_close(*new_te);
1219 		*new_te = NULL;
1220 	}
1221 	return err;
1222 }
1223 
1224 static const struct got_error *
1225 write_tree(struct got_object_id **new_tree_id, const char *path_dir,
1226     struct got_pathlist_head *ignores, struct got_repository *repo,
1227     got_repo_import_cb progress_cb, void *progress_arg)
1228 {
1229 	const struct got_error *err = NULL;
1230 	DIR *dir;
1231 	struct dirent *de;
1232 	struct got_tree_entries new_tree_entries;
1233 	struct got_tree_entry *new_te = NULL;
1234 	struct got_pathlist_head paths;
1235 	struct got_pathlist_entry *pe;
1236 	char *name;
1237 
1238 	*new_tree_id = NULL;
1239 
1240 	TAILQ_INIT(&paths);
1241 	new_tree_entries.nentries = 0;
1242 	SIMPLEQ_INIT(&new_tree_entries.head);
1243 
1244 	dir = opendir(path_dir);
1245 	if (dir == NULL) {
1246 		err = got_error_from_errno2("opendir", path_dir);
1247 		goto done;
1248 	}
1249 
1250 	while ((de = readdir(dir)) != NULL) {
1251 		int ignore = 0;
1252 
1253 		if (strcmp(de->d_name, ".") == 0 ||
1254 		    strcmp(de->d_name, "..") == 0)
1255 			continue;
1256 
1257 		TAILQ_FOREACH(pe, ignores, entry) {
1258 			if (fnmatch(pe->path, de->d_name, 0) == 0) {
1259 				ignore = 1;
1260 				break;
1261 			}
1262 		}
1263 		if (ignore)
1264 			continue;
1265 		if (de->d_type == DT_DIR) {
1266 			err = import_subdir(&new_te, de, path_dir,
1267 			    ignores, repo, progress_cb, progress_arg);
1268 			if (err)
1269 				goto done;
1270 		} else if (de->d_type == DT_REG) {
1271 			err = import_file(&new_te, de, path_dir, repo);
1272 			if (err)
1273 				goto done;
1274 		} else
1275 			continue;
1276 
1277 		err = insert_tree_entry(new_te, &paths);
1278 		if (err)
1279 			goto done;
1280 	}
1281 
1282 	TAILQ_FOREACH(pe, &paths, entry) {
1283 		struct got_tree_entry *te = pe->data;
1284 		char *path;
1285 		new_tree_entries.nentries++;
1286 		SIMPLEQ_INSERT_TAIL(&new_tree_entries.head, te, entry);
1287 		if (!S_ISREG(te->mode))
1288 			continue;
1289 		if (asprintf(&path, "%s/%s", path_dir, pe->path) == -1) {
1290 			err = got_error_from_errno("asprintf");
1291 			goto done;
1292 		}
1293 		err = (*progress_cb)(progress_arg, path);
1294 		free(path);
1295 		if (err)
1296 			goto done;
1297 	}
1298 
1299 	name = basename(path_dir);
1300 	if (name == NULL) {
1301 		err = got_error_from_errno("basename");
1302 		goto done;
1303 	}
1304 
1305 	err = got_object_tree_create(new_tree_id, &new_tree_entries, repo);
1306 done:
1307 	if (dir)
1308 		closedir(dir);
1309 	got_object_tree_entries_close(&new_tree_entries);
1310 	got_pathlist_free(&paths);
1311 	return err;
1312 }
1313 
1314 const struct got_error *
1315 got_repo_import(struct got_object_id **new_commit_id, const char *path_dir,
1316     const char *logmsg, const char *author, struct got_pathlist_head *ignores,
1317     struct got_repository *repo, got_repo_import_cb progress_cb,
1318     void *progress_arg)
1319 {
1320 	const struct got_error *err;
1321 	struct got_object_id *new_tree_id;
1322 
1323 	err = write_tree(&new_tree_id, path_dir, ignores, repo,
1324 	    progress_cb, progress_arg);
1325 	if (err)
1326 		return err;
1327 
1328 	err = got_object_commit_create(new_commit_id, new_tree_id, NULL, 0,
1329 	    author, time(NULL), author, time(NULL), logmsg, repo);
1330 	free(new_tree_id);
1331 	return err;
1332 }