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 		err = 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)
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;
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 (lstat(canonpath, &sb) != 0) {
468 		if (errno != ENOENT) {
469 			err = got_error_from_errno();
470 			goto done;
471 		}
472 		/*
473 		 * Path is not on disk.
474 		 * Assume it is already relative to repository root.
475 		 */
476 		path = strdup(canonpath);
477 	} else {
478 		int is_repo_child = 0, is_cwd_child = 0;
479 
480 		path = realpath(canonpath, NULL);
481 		if (path == NULL) {
482 			err = got_error_from_errno();
483 			goto done;
484 		}
485 
486 		repolen = strlen(repo_abspath);
487 		cwdlen = strlen(cwd);
488 		len = strlen(path);
489 
490 		if (len > repolen && strncmp(path, repo_abspath, repolen) == 0)
491 			is_repo_child = 1;
492 		if (len > cwdlen && strncmp(path, cwd, cwdlen) == 0)
493 			is_cwd_child = 1;
494 
495 		if (strcmp(path, repo_abspath) == 0) {
496 			free(path);
497 			path = strdup("");
498 			if (path == NULL) {
499 				err = got_error_from_errno();
500 				goto done;
501 			}
502 		} else if (is_repo_child && is_cwd_child) {
503 			char *child;
504 			/* TODO: Is path inside a got worktree? */
505 			/* Strip common prefix with repository path. */
506 			err = got_path_skip_common_ancestor(&child,
507 			    repo_abspath, path);
508 			if (err)
509 				goto done;
510 			free(path);
511 			path = child;
512 		} else if (is_repo_child) {
513 			/* Matched an on-disk path inside repository. */
514 			if (got_repo_is_bare(repo)) {
515 				/*
516 				 * Matched an on-disk path inside repository
517 				 * database. Treat as repository-relative.
518 				 */
519 			} else {
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 			}
529 		} else if (is_cwd_child) {
530 			char *child;
531 			/* TODO: Is path inside a got worktree? */
532 			/* Strip common prefix with cwd. */
533 			err = got_path_skip_common_ancestor(&child, cwd,
534 			    path);
535 			if (err)
536 				goto done;
537 			free(path);
538 			path = child;
539 		} else {
540 			/*
541 			 * Matched unrelated on-disk path.
542 			 * Treat it as repository-relative.
543 			 */
544 		}
545 	}
546 
547 	/* Make in-repository path absolute */
548 	if (path[0] != '/') {
549 		char *abspath;
550 		if (asprintf(&abspath, "/%s", path) == -1) {
551 			err = got_error_from_errno();
552 			goto done;
553 		}
554 		free(path);
555 		path = abspath;
556 	}
557 
558 done:
559 	free(repo_abspath);
560 	free(cwd);
561 	free(canonpath);
562 	if (err)
563 		free(path);
564 	else
565 		*in_repo_path = path;
566 	return err;
567 }
568 
569 const struct got_error *
570 got_repo_cache_packidx(struct got_repository *repo, struct got_packidx *packidx)
571 {
572 	const struct got_error *err = NULL;
573 	int i;
574 
575 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
576 		if (repo->packidx_cache[i] == NULL)
577 			break;
578 	}
579 
580 	if (i == nitems(repo->packidx_cache)) {
581 		err = got_packidx_close(repo->packidx_cache[i - 1]);
582 		if (err)
583 			return err;
584 		memmove(&repo->packidx_cache[1], &repo->packidx_cache[0],
585 		    sizeof(repo->packidx_cache) -
586 		    sizeof(repo->packidx_cache[0]));
587 		i = 0;
588 	}
589 
590 	repo->packidx_cache[i] = packidx;
591 	return NULL;
592 }
593 
594 static int
595 is_packidx_filename(const char *name, size_t len)
596 {
597 	if (len != GOT_PACKIDX_NAMELEN)
598 		return 0;
599 
600 	if (strncmp(name, GOT_PACK_PREFIX, strlen(GOT_PACK_PREFIX)) != 0)
601 		return 0;
602 
603 	if (strcmp(name + strlen(GOT_PACK_PREFIX) +
604 	    SHA1_DIGEST_STRING_LENGTH - 1, GOT_PACKIDX_SUFFIX) != 0)
605 		return 0;
606 
607 	return 1;
608 }
609 
610 const struct got_error *
611 got_repo_search_packidx(struct got_packidx **packidx, int *idx,
612     struct got_repository *repo, struct got_object_id *id)
613 {
614 	const struct got_error *err;
615 	char *path_packdir;
616 	DIR *packdir;
617 	struct dirent *dent;
618 	char *path_packidx;
619 	int i;
620 
621 	/* Search pack index cache. */
622 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
623 		if (repo->packidx_cache[i] == NULL)
624 			break;
625 		*idx = got_packidx_get_object_idx(repo->packidx_cache[i], id);
626 		if (*idx != -1) {
627 			*packidx = repo->packidx_cache[i];
628 			return NULL;
629 		}
630 	}
631 	/* No luck. Search the filesystem. */
632 
633 	path_packdir = got_repo_get_path_objects_pack(repo);
634 	if (path_packdir == NULL)
635 		return got_error_from_errno();
636 
637 	packdir = opendir(path_packdir);
638 	if (packdir == NULL) {
639 		err = got_error_from_errno();
640 		goto done;
641 	}
642 
643 	while ((dent = readdir(packdir)) != NULL) {
644 		if (!is_packidx_filename(dent->d_name, dent->d_namlen))
645 			continue;
646 
647 		if (asprintf(&path_packidx, "%s/%s", path_packdir,
648 		    dent->d_name) == -1) {
649 			err = got_error_from_errno();
650 			goto done;
651 		}
652 
653 		err = got_packidx_open(packidx, path_packidx, 0);
654 		free(path_packidx);
655 		if (err)
656 			goto done;
657 
658 		*idx = got_packidx_get_object_idx(*packidx, id);
659 		if (*idx != -1) {
660 			err = NULL; /* found the object */
661 			err = got_repo_cache_packidx(repo, *packidx);
662 			goto done;
663 		}
664 
665 		err = got_packidx_close(*packidx);
666 		*packidx = NULL;
667 		if (err)
668 			goto done;
669 	}
670 
671 	err = got_error(GOT_ERR_NO_OBJ);
672 done:
673 	free(path_packdir);
674 	if (packdir && closedir(packdir) != 0 && err == 0)
675 		err = got_error_from_errno();
676 	return err;
677 }
678 
679 static const struct got_error *
680 read_packfile_hdr(int fd, struct got_packidx *packidx)
681 {
682 	const struct got_error *err = NULL;
683 	uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
684 	struct got_packfile_hdr hdr;
685 	ssize_t n;
686 
687 	n = read(fd, &hdr, sizeof(hdr));
688 	if (n < 0)
689 		return got_error_from_errno();
690 	if (n != sizeof(hdr))
691 		return got_error(GOT_ERR_BAD_PACKFILE);
692 
693 	if (betoh32(hdr.signature) != GOT_PACKFILE_SIGNATURE ||
694 	    betoh32(hdr.version) != GOT_PACKFILE_VERSION ||
695 	    betoh32(hdr.nobjects) != totobj)
696 		err = got_error(GOT_ERR_BAD_PACKFILE);
697 
698 	return err;
699 }
700 
701 static const struct got_error *
702 open_packfile(int *fd, const char *path_packfile, struct got_packidx *packidx)
703 {
704 	const struct got_error *err = NULL;
705 
706 	*fd = open(path_packfile, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
707 	if (*fd == -1)
708 		return got_error_from_errno();
709 
710 	if (packidx) {
711 		err = read_packfile_hdr(*fd, packidx);
712 		if (err) {
713 			close(*fd);
714 			*fd = -1;
715 		}
716 	}
717 
718 	return err;
719 }
720 
721 const struct got_error *
722 got_repo_cache_pack(struct got_pack **packp, struct got_repository *repo,
723     const char *path_packfile, struct got_packidx *packidx)
724 {
725 	const struct got_error *err = NULL;
726 	struct got_pack *pack = NULL;
727 	int i;
728 
729 	if (packp)
730 		*packp = NULL;
731 
732 	for (i = 0; i < nitems(repo->packs); i++) {
733 		pack = &repo->packs[i];
734 		if (pack->path_packfile == NULL)
735 			break;
736 		if (strcmp(pack->path_packfile, path_packfile) == 0)
737 			return NULL;
738 	}
739 
740 	if (i == nitems(repo->packs) - 1) {
741 		err = got_pack_close(&repo->packs[i - 1]);
742 		if (err)
743 			return err;
744 		memmove(&repo->packs[1], &repo->packs[0],
745 		    sizeof(repo->packs) - sizeof(repo->packs[0]));
746 		i = 0;
747 	}
748 
749 	pack = &repo->packs[i];
750 
751 	pack->path_packfile = strdup(path_packfile);
752 	if (pack->path_packfile == NULL) {
753 		err = got_error_from_errno();
754 		goto done;
755 	}
756 
757 	err = open_packfile(&pack->fd, path_packfile, packidx);
758 	if (err)
759 		goto done;
760 
761 	err = got_pack_get_packfile_size(&pack->filesize, path_packfile);
762 	if (err)
763 		goto done;
764 
765 	pack->privsep_child = NULL;
766 
767 #ifndef GOT_PACK_NO_MMAP
768 	pack->map = mmap(NULL, pack->filesize, PROT_READ, MAP_PRIVATE,
769 	    pack->fd, 0);
770 	if (pack->map == MAP_FAILED)
771 		pack->map = NULL; /* fall back to read(2) */
772 #endif
773 done:
774 	if (err) {
775 		if (pack) {
776 			free(pack->path_packfile);
777 			memset(pack, 0, sizeof(*pack));
778 		}
779 	} else if (packp)
780 		*packp = pack;
781 	return err;
782 }
783 
784 struct got_pack *
785 got_repo_get_cached_pack(struct got_repository *repo, const char *path_packfile)
786 {
787 	struct got_pack *pack = NULL;
788 	int i;
789 
790 	for (i = 0; i < nitems(repo->packs); i++) {
791 		pack = &repo->packs[i];
792 		if (pack->path_packfile == NULL)
793 			break;
794 		if (strcmp(pack->path_packfile, path_packfile) == 0)
795 			return pack;
796 	}
797 
798 	return NULL;
799 }