1 /*
2  * Copyright (c) 2018 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 <fcntl.h>
25 #include <limits.h>
26 #include <dirent.h>
27 #include <stdlib.h>
28 #include <stdio.h>
29 #include <sha1.h>
30 #include <string.h>
31 #include <zlib.h>
32 #include <errno.h>
33 #include <libgen.h>
34 #include <stdint.h>
35 #include <imsg.h>
36 
37 #include "got_error.h"
38 #include "got_reference.h"
39 #include "got_repository.h"
40 #include "got_worktree.h"
41 #include "got_object.h"
42 
43 #include "got_lib_path.h"
44 #include "got_lib_delta.h"
45 #include "got_lib_inflate.h"
46 #include "got_lib_object.h"
47 #include "got_lib_pack.h"
48 #include "got_lib_privsep.h"
49 #include "got_lib_worktree.h"
50 #include "got_lib_object_cache.h"
51 #include "got_lib_repository.h"
52 
53 #ifndef nitems
54 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
55 #endif
56 
57 #define GOT_GIT_DIR	".git"
58 
59 /* Mandatory files and directories inside the git directory. */
60 #define GOT_OBJECTS_DIR		"objects"
61 #define GOT_REFS_DIR		"refs"
62 #define GOT_HEAD_FILE		"HEAD"
63 
64 /* Other files and directories inside the git directory. */
65 #define GOT_FETCH_HEAD_FILE	"FETCH_HEAD"
66 #define GOT_ORIG_HEAD_FILE	"ORIG_HEAD"
67 #define GOT_OBJECTS_PACK_DIR	"objects/pack"
68 
69 char *
70 got_repo_get_path(struct got_repository *repo)
71 {
72 	return strdup(repo->path);
73 }
74 
75 char *
76 got_repo_get_path_git_dir(struct got_repository *repo)
77 {
78 	return strdup(repo->path_git_dir);
79 }
80 
81 int
82 got_repo_is_bare(struct got_repository *repo)
83 {
84 	return (strcmp(repo->path, repo->path_git_dir) == 0);
85 }
86 
87 static char *
88 get_path_git_child(struct got_repository *repo, const char *basename)
89 {
90 	char *path_child;
91 	
92 	if (asprintf(&path_child, "%s/%s", repo->path_git_dir,
93 	    basename) == -1)
94 		return NULL;
95 
96 	return path_child;
97 }
98 
99 char *
100 got_repo_get_path_objects(struct got_repository *repo)
101 {
102 	return get_path_git_child(repo, GOT_OBJECTS_DIR);
103 }
104 
105 char *
106 got_repo_get_path_objects_pack(struct got_repository *repo)
107 {
108 	return get_path_git_child(repo, GOT_OBJECTS_PACK_DIR);
109 }
110 
111 char *
112 got_repo_get_path_refs(struct got_repository *repo)
113 {
114 	return get_path_git_child(repo, GOT_REFS_DIR);
115 }
116 
117 static char *
118 get_path_head(struct got_repository *repo)
119 {
120 	return get_path_git_child(repo, GOT_HEAD_FILE);
121 }
122 
123 static int
124 is_git_repo(struct got_repository *repo)
125 {
126 	char *path_git = got_repo_get_path_git_dir(repo);
127 	char *path_objects = got_repo_get_path_objects(repo);
128 	char *path_refs = got_repo_get_path_refs(repo);
129 	char *path_head = get_path_head(repo);
130 	int ret = 0;
131 	struct stat sb;
132 	struct got_reference *head_ref;
133 
134 	if (lstat(path_git, &sb) == -1)
135 		goto done;
136 	if (!S_ISDIR(sb.st_mode))
137 		goto done;
138 
139 	if (lstat(path_objects, &sb) == -1)
140 		goto done;
141 	if (!S_ISDIR(sb.st_mode))
142 		goto done;
143 
144 	if (lstat(path_refs, &sb) == -1)
145 		goto done;
146 	if (!S_ISDIR(sb.st_mode))
147 		goto done;
148 
149 	if (lstat(path_head, &sb) == -1)
150 		goto done;
151 	if (!S_ISREG(sb.st_mode))
152 		goto done;
153 
154 	/* Check if the HEAD reference can be opened. */
155 	if (got_ref_open(&head_ref, repo, GOT_REF_HEAD) != NULL)
156 		goto done;
157 	got_ref_close(head_ref);
158 
159 	ret = 1;
160 done:
161 	free(path_git);
162 	free(path_objects);
163 	free(path_refs);
164 	free(path_head);
165 	return ret;
166 
167 }
168 
169 const struct got_error *
170 got_repo_cache_object(struct got_repository *repo, struct got_object_id *id,
171     struct got_object *obj)
172 {
173 #ifndef GOT_NO_OBJ_CACHE
174 	const struct got_error *err = NULL;
175 	err = got_object_cache_add(&repo->objcache, id, obj);
176 	if (err)
177 		return err;
178 	obj->refcnt++;
179 #endif
180 	return NULL;
181 }
182 
183 struct got_object *
184 got_repo_get_cached_object(struct got_repository *repo,
185     struct got_object_id *id)
186 {
187 	return (struct got_object *)got_object_cache_get(&repo->objcache, id);
188 }
189 
190 const struct got_error *
191 got_repo_cache_tree(struct got_repository *repo, struct got_object_id *id,
192     struct got_tree_object *tree)
193 {
194 #ifndef GOT_NO_OBJ_CACHE
195 	const struct got_error *err = NULL;
196 	err = got_object_cache_add(&repo->treecache, id, tree);
197 	if (err)
198 		return err;
199 	tree->refcnt++;
200 #endif
201 	return NULL;
202 }
203 
204 struct got_tree_object *
205 got_repo_get_cached_tree(struct got_repository *repo,
206     struct got_object_id *id)
207 {
208 	return (struct got_tree_object *)got_object_cache_get(
209 	    &repo->treecache, id);
210 }
211 
212 const struct got_error *
213 got_repo_cache_commit(struct got_repository *repo, struct got_object_id *id,
214     struct got_commit_object *commit)
215 {
216 #ifndef GOT_NO_OBJ_CACHE
217 	const struct got_error *err = NULL;
218 	err = got_object_cache_add(&repo->commitcache, id, commit);
219 	if (err)
220 		return err;
221 	commit->refcnt++;
222 #endif
223 	return NULL;
224 }
225 
226 struct got_commit_object *
227 got_repo_get_cached_commit(struct got_repository *repo,
228     struct got_object_id *id)
229 {
230 	return (struct got_commit_object *)got_object_cache_get(
231 	    &repo->commitcache, id);
232 }
233 
234 const struct got_error *
235 open_repo(struct got_repository *repo, const char *path)
236 {
237 	const struct got_error *err = NULL;
238 	struct got_worktree *worktree = NULL;
239 
240 	/* bare git repository? */
241 	repo->path_git_dir = strdup(path);
242 	if (repo->path_git_dir == NULL) {
243 		err = got_error_from_errno();
244 		goto done;
245 	}
246 	if (is_git_repo(repo)) {
247 		repo->path = strdup(repo->path_git_dir);
248 		if (repo->path == NULL) {
249 			err = got_error_from_errno();
250 			goto done;
251 		}
252 		return NULL;
253 	}
254 
255 	/* git repository with working tree? */
256 	free(repo->path_git_dir);
257 	if (asprintf(&repo->path_git_dir, "%s/%s", path, GOT_GIT_DIR) == -1) {
258 		err = got_error_from_errno();
259 		goto done;
260 	}
261 	if (is_git_repo(repo)) {
262 		repo->path = strdup(path);
263 		if (repo->path == NULL) {
264 			err = got_error_from_errno();
265 			goto done;
266 		}
267 		return NULL;
268 	}
269 
270 	/* got work tree checked out from bare git repository? */
271 	free(repo->path_git_dir);
272 	repo->path_git_dir = NULL;
273 	err = got_worktree_open(&worktree, path);
274 	if (err) {
275 		if (err->code == GOT_ERR_ERRNO && errno == ENOENT)
276 			err = got_error(GOT_ERR_NOT_GIT_REPO);
277 		goto done;
278 	}
279 	repo->path_git_dir = strdup(worktree->repo_path);
280 	if (repo->path_git_dir == NULL) {
281 		err = got_error_from_errno();
282 		goto done;
283 	}
284 
285 	/* got work tree checked out from git repository with working tree? */
286 	if (!is_git_repo(repo)) {
287 		free(repo->path_git_dir);
288 		if (asprintf(&repo->path_git_dir, "%s/%s", worktree->repo_path,
289 		    GOT_GIT_DIR) == -1) {
290 			err = got_error_from_errno();
291 			repo->path_git_dir = NULL;
292 			goto done;
293 		}
294 		if (!is_git_repo(repo)) {
295 			err = got_error(GOT_ERR_NOT_GIT_REPO);
296 			goto done;
297 		}
298 		repo->path = strdup(worktree->repo_path);
299 		if (repo->path == NULL) {
300 			err = got_error_from_errno();
301 			goto done;
302 		}
303 	} else {
304 		repo->path = strdup(repo->path_git_dir);
305 		if (repo->path == NULL) {
306 			err = got_error_from_errno();
307 			goto done;
308 		}
309 	}
310 done:
311 	if (worktree)
312 		got_worktree_close(worktree);
313 	return err;
314 }
315 
316 const struct got_error *
317 got_repo_open(struct got_repository **repop, const char *path)
318 {
319 	struct got_repository *repo = NULL;
320 	const struct got_error *err = NULL;
321 	char *abspath, *normpath = NULL;
322 	int i, tried_root = 0;
323 
324 	*repop = NULL;
325 
326 	if (got_path_is_absolute(path))
327 		abspath = strdup(path);
328 	else
329 		abspath = got_path_get_absolute(path);
330 	if (abspath == NULL)
331 		return got_error(GOT_ERR_BAD_PATH);
332 
333 	repo = calloc(1, sizeof(*repo));
334 	if (repo == NULL) {
335 		err = got_error_from_errno();
336 		goto done;
337 	}
338 
339 	for (i = 0; i < nitems(repo->privsep_children); i++) {
340 		memset(&repo->privsep_children[i], 0,
341 		    sizeof(repo->privsep_children[0]));
342 		repo->privsep_children[i].imsg_fd = -1;
343 	}
344 
345 	err = got_object_cache_init(&repo->objcache,
346 	    GOT_OBJECT_CACHE_TYPE_OBJ);
347 	if (err)
348 		goto done;
349 	err = got_object_cache_init(&repo->treecache,
350 	    GOT_OBJECT_CACHE_TYPE_TREE);
351 	if (err)
352 		goto done;
353 	err = got_object_cache_init(&repo->commitcache,
354 	    GOT_OBJECT_CACHE_TYPE_COMMIT);
355 	if (err)
356 		goto done;
357 
358 	normpath = got_path_normalize(abspath);
359 	if (normpath == NULL) {
360 		err = got_error(GOT_ERR_BAD_PATH);
361 		goto done;
362 	}
363 
364 	path = normpath;
365 	do {
366 		err = open_repo(repo, path);
367 		if (err == NULL)
368 			break;
369 		if (err->code != GOT_ERR_NOT_GIT_REPO)
370 			break;
371 		if (path[0] == '/' && path[1] == '\0') {
372 			if (tried_root) {
373 				err = got_error(GOT_ERR_NOT_GIT_REPO);
374 				break;
375 			}
376 			tried_root = 1;
377 		}
378 		path = dirname(path);
379 		if (path == NULL)
380 			err = got_error_from_errno();
381 	} while (path);
382 done:
383 	if (err)
384 		got_repo_close(repo);
385 	else
386 		*repop = repo;
387 	free(abspath);
388 	free(normpath);
389 	return err;
390 }
391 
392 const struct got_error *
393 got_repo_close(struct got_repository *repo)
394 {
395 	const struct got_error *err = NULL, *child_err;
396 	int i;
397 
398 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
399 		if (repo->packidx_cache[i] == NULL)
400 			break;
401 		got_packidx_close(repo->packidx_cache[i]);
402 	}
403 
404 	for (i = 0; i < nitems(repo->packs); i++) {
405 		if (repo->packs[i].path_packfile == NULL)
406 			break;
407 		got_pack_close(&repo->packs[i]);
408 	}
409 
410 	free(repo->path);
411 	free(repo->path_git_dir);
412 
413 	got_object_cache_close(&repo->objcache);
414 	got_object_cache_close(&repo->treecache);
415 	got_object_cache_close(&repo->commitcache);
416 
417 	for (i = 0; i < nitems(repo->privsep_children); i++) {
418 		if (repo->privsep_children[i].imsg_fd == -1)
419 			continue;
420 		imsg_clear(repo->privsep_children[i].ibuf);
421 		free(repo->privsep_children[i].ibuf);
422 		err = got_privsep_send_stop(repo->privsep_children[i].imsg_fd);
423 		child_err = got_privsep_wait_for_child(
424 		    repo->privsep_children[i].pid);
425 		if (child_err && err == NULL)
426 			err = child_err;
427 		close(repo->privsep_children[i].imsg_fd);
428 	}
429 	free(repo);
430 
431 	return err;
432 }
433 
434 const struct got_error *
435 got_repo_map_path(char **in_repo_path, struct got_repository *repo,
436     const char *input_path, int check_disk)
437 {
438 	const struct got_error *err = NULL;
439 	char *repo_abspath = NULL, *cwd = NULL;
440 	struct stat sb;
441 	size_t repolen, cwdlen, len;
442 	char *canonpath, *path = NULL;
443 
444 	*in_repo_path = NULL;
445 
446 	cwd = getcwd(NULL, 0);
447 	if (cwd == NULL)
448 		return got_error_from_errno();
449 
450 	canonpath = strdup(input_path);
451 	if (canonpath == NULL) {
452 		err = got_error_from_errno();
453 		goto done;
454 	}
455 	err = got_canonpath(input_path, canonpath, strlen(canonpath) + 1);
456 	if (err)
457 		goto done;
458 
459 	repo_abspath = got_repo_get_path(repo);
460 	if (repo_abspath == NULL) {
461 		err = got_error_from_errno();
462 		goto done;
463 	}
464 
465 	/* TODO: Call "get in-repository path of work-tree node" API. */
466 
467 	if (!check_disk)
468 		path = strdup(canonpath);
469 	else if (lstat(canonpath, &sb) != 0) {
470 		if (errno != ENOENT) {
471 			err = got_error_from_errno();
472 			goto done;
473 		}
474 		/*
475 		 * Path is not on disk.
476 		 * Assume it is already relative to repository root.
477 		 */
478 		path = strdup(canonpath);
479 	} else {
480 		int is_repo_child = 0, is_cwd_child = 0;
481 
482 		path = realpath(canonpath, NULL);
483 		if (path == NULL) {
484 			err = got_error_from_errno();
485 			goto done;
486 		}
487 
488 		repolen = strlen(repo_abspath);
489 		cwdlen = strlen(cwd);
490 		len = strlen(path);
491 
492 		if (len > repolen && strncmp(path, repo_abspath, repolen) == 0)
493 			is_repo_child = 1;
494 		if (len > cwdlen && strncmp(path, cwd, cwdlen) == 0)
495 			is_cwd_child = 1;
496 
497 		if (strcmp(path, repo_abspath) == 0) {
498 			free(path);
499 			path = strdup("");
500 			if (path == NULL) {
501 				err = got_error_from_errno();
502 				goto done;
503 			}
504 		} else if (is_repo_child && is_cwd_child) {
505 			char *child;
506 			/* TODO: Is path inside a got worktree? */
507 			/* Strip common prefix with repository path. */
508 			err = got_path_skip_common_ancestor(&child,
509 			    repo_abspath, path);
510 			if (err)
511 				goto done;
512 			free(path);
513 			path = child;
514 		} else if (is_repo_child) {
515 			/* Matched an on-disk path inside repository. */
516 			if (got_repo_is_bare(repo)) {
517 				/*
518 				 * Matched an on-disk path inside repository
519 				 * database. Treat as repository-relative.
520 				 */
521 			} else {
522 				char *child;
523 				/* Strip common prefix with repository path. */
524 				err = got_path_skip_common_ancestor(&child,
525 				    repo_abspath, path);
526 				if (err)
527 					goto done;
528 				free(path);
529 				path = child;
530 			}
531 		} else if (is_cwd_child) {
532 			char *child;
533 			/* TODO: Is path inside a got worktree? */
534 			/* Strip common prefix with cwd. */
535 			err = got_path_skip_common_ancestor(&child, cwd,
536 			    path);
537 			if (err)
538 				goto done;
539 			free(path);
540 			path = child;
541 		} else {
542 			/*
543 			 * Matched unrelated on-disk path.
544 			 * Treat it as repository-relative.
545 			 */
546 		}
547 	}
548 
549 	/* Make in-repository path absolute */
550 	if (path[0] != '/') {
551 		char *abspath;
552 		if (asprintf(&abspath, "/%s", path) == -1) {
553 			err = got_error_from_errno();
554 			goto done;
555 		}
556 		free(path);
557 		path = abspath;
558 	}
559 
560 done:
561 	free(repo_abspath);
562 	free(cwd);
563 	free(canonpath);
564 	if (err)
565 		free(path);
566 	else
567 		*in_repo_path = path;
568 	return err;
569 }
570 
571 const struct got_error *
572 got_repo_cache_packidx(struct got_repository *repo, struct got_packidx *packidx)
573 {
574 	const struct got_error *err = NULL;
575 	int i;
576 
577 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
578 		if (repo->packidx_cache[i] == NULL)
579 			break;
580 	}
581 	if (i == nitems(repo->packidx_cache)) {
582 		err = got_packidx_close(repo->packidx_cache[i - 1]);
583 		if (err)
584 			return err;
585 	}
586 
587 	/*
588 	 * Insert the new pack index at the front so it will
589 	 * be searched first in the future.
590 	 */
591 	memmove(&repo->packidx_cache[1], &repo->packidx_cache[0],
592 	    sizeof(repo->packidx_cache) -
593 	    sizeof(repo->packidx_cache[0]));
594 	repo->packidx_cache[0] = packidx;
595 
596 	return NULL;
597 }
598 
599 static int
600 is_packidx_filename(const char *name, size_t len)
601 {
602 	if (len != GOT_PACKIDX_NAMELEN)
603 		return 0;
604 
605 	if (strncmp(name, GOT_PACK_PREFIX, strlen(GOT_PACK_PREFIX)) != 0)
606 		return 0;
607 
608 	if (strcmp(name + strlen(GOT_PACK_PREFIX) +
609 	    SHA1_DIGEST_STRING_LENGTH - 1, GOT_PACKIDX_SUFFIX) != 0)
610 		return 0;
611 
612 	return 1;
613 }
614 
615 const struct got_error *
616 got_repo_search_packidx(struct got_packidx **packidx, int *idx,
617     struct got_repository *repo, struct got_object_id *id)
618 {
619 	const struct got_error *err;
620 	char *path_packdir;
621 	DIR *packdir;
622 	struct dirent *dent;
623 	char *path_packidx;
624 	int i;
625 
626 	/* Search pack index cache. */
627 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
628 		if (repo->packidx_cache[i] == NULL)
629 			break;
630 		*idx = got_packidx_get_object_idx(repo->packidx_cache[i], id);
631 		if (*idx != -1) {
632 			*packidx = repo->packidx_cache[i];
633 			return NULL;
634 		}
635 	}
636 	/* No luck. Search the filesystem. */
637 
638 	path_packdir = got_repo_get_path_objects_pack(repo);
639 	if (path_packdir == NULL)
640 		return got_error_from_errno();
641 
642 	packdir = opendir(path_packdir);
643 	if (packdir == NULL) {
644 		err = got_error_from_errno();
645 		goto done;
646 	}
647 
648 	while ((dent = readdir(packdir)) != NULL) {
649 		if (!is_packidx_filename(dent->d_name, dent->d_namlen))
650 			continue;
651 
652 		if (asprintf(&path_packidx, "%s/%s", path_packdir,
653 		    dent->d_name) == -1) {
654 			err = got_error_from_errno();
655 			goto done;
656 		}
657 
658 		err = got_packidx_open(packidx, path_packidx, 0);
659 		free(path_packidx);
660 		if (err)
661 			goto done;
662 
663 		*idx = got_packidx_get_object_idx(*packidx, id);
664 		if (*idx != -1) {
665 			err = NULL; /* found the object */
666 			err = got_repo_cache_packidx(repo, *packidx);
667 			goto done;
668 		}
669 
670 		err = got_packidx_close(*packidx);
671 		*packidx = NULL;
672 		if (err)
673 			goto done;
674 	}
675 
676 	err = got_error(GOT_ERR_NO_OBJ);
677 done:
678 	free(path_packdir);
679 	if (packdir && closedir(packdir) != 0 && err == 0)
680 		err = got_error_from_errno();
681 	return err;
682 }
683 
684 static const struct got_error *
685 read_packfile_hdr(int fd, struct got_packidx *packidx)
686 {
687 	const struct got_error *err = NULL;
688 	uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
689 	struct got_packfile_hdr hdr;
690 	ssize_t n;
691 
692 	n = read(fd, &hdr, sizeof(hdr));
693 	if (n < 0)
694 		return got_error_from_errno();
695 	if (n != sizeof(hdr))
696 		return got_error(GOT_ERR_BAD_PACKFILE);
697 
698 	if (betoh32(hdr.signature) != GOT_PACKFILE_SIGNATURE ||
699 	    betoh32(hdr.version) != GOT_PACKFILE_VERSION ||
700 	    betoh32(hdr.nobjects) != totobj)
701 		err = got_error(GOT_ERR_BAD_PACKFILE);
702 
703 	return err;
704 }
705 
706 static const struct got_error *
707 open_packfile(int *fd, const char *path_packfile, struct got_packidx *packidx)
708 {
709 	const struct got_error *err = NULL;
710 
711 	*fd = open(path_packfile, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
712 	if (*fd == -1)
713 		return got_error_from_errno();
714 
715 	if (packidx) {
716 		err = read_packfile_hdr(*fd, packidx);
717 		if (err) {
718 			close(*fd);
719 			*fd = -1;
720 		}
721 	}
722 
723 	return err;
724 }
725 
726 const struct got_error *
727 got_repo_cache_pack(struct got_pack **packp, struct got_repository *repo,
728     const char *path_packfile, struct got_packidx *packidx)
729 {
730 	const struct got_error *err = NULL;
731 	struct got_pack *pack = NULL;
732 	int i;
733 
734 	if (packp)
735 		*packp = NULL;
736 
737 	for (i = 0; i < nitems(repo->packs); i++) {
738 		pack = &repo->packs[i];
739 		if (pack->path_packfile == NULL)
740 			break;
741 		if (strcmp(pack->path_packfile, path_packfile) == 0)
742 			return NULL;
743 	}
744 
745 	if (i == nitems(repo->packs) - 1) {
746 		err = got_pack_close(&repo->packs[i - 1]);
747 		if (err)
748 			return err;
749 		memmove(&repo->packs[1], &repo->packs[0],
750 		    sizeof(repo->packs) - sizeof(repo->packs[0]));
751 		i = 0;
752 	}
753 
754 	pack = &repo->packs[i];
755 
756 	pack->path_packfile = strdup(path_packfile);
757 	if (pack->path_packfile == NULL) {
758 		err = got_error_from_errno();
759 		goto done;
760 	}
761 
762 	err = open_packfile(&pack->fd, path_packfile, packidx);
763 	if (err)
764 		goto done;
765 
766 	err = got_pack_get_packfile_size(&pack->filesize, path_packfile);
767 	if (err)
768 		goto done;
769 
770 	pack->privsep_child = NULL;
771 
772 #ifndef GOT_PACK_NO_MMAP
773 	pack->map = mmap(NULL, pack->filesize, PROT_READ, MAP_PRIVATE,
774 	    pack->fd, 0);
775 	if (pack->map == MAP_FAILED)
776 		pack->map = NULL; /* fall back to read(2) */
777 #endif
778 done:
779 	if (err) {
780 		if (pack) {
781 			free(pack->path_packfile);
782 			memset(pack, 0, sizeof(*pack));
783 		}
784 	} else if (packp)
785 		*packp = pack;
786 	return err;
787 }
788 
789 struct got_pack *
790 got_repo_get_cached_pack(struct got_repository *repo, const char *path_packfile)
791 {
792 	struct got_pack *pack = NULL;
793 	int i;
794 
795 	for (i = 0; i < nitems(repo->packs); i++) {
796 		pack = &repo->packs[i];
797 		if (pack->path_packfile == NULL)
798 			break;
799 		if (strcmp(pack->path_packfile, path_packfile) == 0)
800 			return pack;
801 	}
802 
803 	return NULL;
804 }