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