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Date:: Fri Feb 1 20:01:58 2019 UTC
Message:: add read support for packed refs
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 <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 #define GOT_PACKED_REFS_FILE	"packed-refs"
69 
70 const char *
71 got_repo_get_path(struct got_repository *repo)
72 {
73 	return repo->path;
74 }
75 
76 const char *
77 got_repo_get_path_git_dir(struct got_repository *repo)
78 {
79 	return repo->path_git_dir;
80 }
81 
82 int
83 got_repo_is_bare(struct got_repository *repo)
84 {
85 	return (strcmp(repo->path, repo->path_git_dir) == 0);
86 }
87 
88 static char *
89 get_path_git_child(struct got_repository *repo, const char *basename)
90 {
91 	char *path_child;
92 	
93 	if (asprintf(&path_child, "%s/%s", repo->path_git_dir,
94 	    basename) == -1)
95 		return NULL;
96 
97 	return path_child;
98 }
99 
100 char *
101 got_repo_get_path_objects(struct got_repository *repo)
102 {
103 	return get_path_git_child(repo, GOT_OBJECTS_DIR);
104 }
105 
106 char *
107 got_repo_get_path_objects_pack(struct got_repository *repo)
108 {
109 	return get_path_git_child(repo, GOT_OBJECTS_PACK_DIR);
110 }
111 
112 char *
113 got_repo_get_path_refs(struct got_repository *repo)
114 {
115 	return get_path_git_child(repo, GOT_REFS_DIR);
116 }
117 
118 char *
119 got_repo_get_path_packed_refs(struct got_repository *repo)
120 {
121 	return get_path_git_child(repo, GOT_PACKED_REFS_FILE);
122 }
123 
124 static char *
125 get_path_head(struct got_repository *repo)
126 {
127 	return get_path_git_child(repo, GOT_HEAD_FILE);
128 }
129 
130 static int
131 is_git_repo(struct got_repository *repo)
132 {
133 	const char *path_git = got_repo_get_path_git_dir(repo);
134 	char *path_objects = got_repo_get_path_objects(repo);
135 	char *path_refs = got_repo_get_path_refs(repo);
136 	char *path_head = get_path_head(repo);
137 	int ret = 0;
138 	struct stat sb;
139 	struct got_reference *head_ref;
140 
141 	if (lstat(path_git, &sb) == -1)
142 		goto done;
143 	if (!S_ISDIR(sb.st_mode))
144 		goto done;
145 
146 	if (lstat(path_objects, &sb) == -1)
147 		goto done;
148 	if (!S_ISDIR(sb.st_mode))
149 		goto done;
150 
151 	if (lstat(path_refs, &sb) == -1)
152 		goto done;
153 	if (!S_ISDIR(sb.st_mode))
154 		goto done;
155 
156 	if (lstat(path_head, &sb) == -1)
157 		goto done;
158 	if (!S_ISREG(sb.st_mode))
159 		goto done;
160 
161 	/* Check if the HEAD reference can be opened. */
162 	if (got_ref_open(&head_ref, repo, GOT_REF_HEAD) != NULL)
163 		goto done;
164 	got_ref_close(head_ref);
165 
166 	ret = 1;
167 done:
168 	free(path_objects);
169 	free(path_refs);
170 	free(path_head);
171 	return ret;
172 
173 }
174 
175 const struct got_error *
176 got_repo_cache_object(struct got_repository *repo, struct got_object_id *id,
177     struct got_object *obj)
178 {
179 #ifndef GOT_NO_OBJ_CACHE
180 	const struct got_error *err = NULL;
181 	err = got_object_cache_add(&repo->objcache, id, obj);
182 	if (err)
183 		return err;
184 	obj->refcnt++;
185 #endif
186 	return NULL;
187 }
188 
189 struct got_object *
190 got_repo_get_cached_object(struct got_repository *repo,
191     struct got_object_id *id)
192 {
193 	return (struct got_object *)got_object_cache_get(&repo->objcache, id);
194 }
195 
196 const struct got_error *
197 got_repo_cache_tree(struct got_repository *repo, struct got_object_id *id,
198     struct got_tree_object *tree)
199 {
200 #ifndef GOT_NO_OBJ_CACHE
201 	const struct got_error *err = NULL;
202 	err = got_object_cache_add(&repo->treecache, id, tree);
203 	if (err)
204 		return err;
205 	tree->refcnt++;
206 #endif
207 	return NULL;
208 }
209 
210 struct got_tree_object *
211 got_repo_get_cached_tree(struct got_repository *repo,
212     struct got_object_id *id)
213 {
214 	return (struct got_tree_object *)got_object_cache_get(
215 	    &repo->treecache, id);
216 }
217 
218 const struct got_error *
219 got_repo_cache_commit(struct got_repository *repo, struct got_object_id *id,
220     struct got_commit_object *commit)
221 {
222 #ifndef GOT_NO_OBJ_CACHE
223 	const struct got_error *err = NULL;
224 	err = got_object_cache_add(&repo->commitcache, id, commit);
225 	if (err)
226 		return err;
227 	commit->refcnt++;
228 #endif
229 	return NULL;
230 }
231 
232 struct got_commit_object *
233 got_repo_get_cached_commit(struct got_repository *repo,
234     struct got_object_id *id)
235 {
236 	return (struct got_commit_object *)got_object_cache_get(
237 	    &repo->commitcache, id);
238 }
239 
240 const struct got_error *
241 got_repo_cache_tag(struct got_repository *repo, struct got_object_id *id,
242     struct got_tag_object *tag)
243 {
244 #ifndef GOT_NO_OBJ_CACHE
245 	const struct got_error *err = NULL;
246 	err = got_object_cache_add(&repo->tagcache, id, tag);
247 	if (err)
248 		return err;
249 	tag->refcnt++;
250 #endif
251 	return NULL;
252 }
253 
254 struct got_tag_object *
255 got_repo_get_cached_tag(struct got_repository *repo, struct got_object_id *id)
256 {
257 	return (struct got_tag_object *)got_object_cache_get(
258 	    &repo->tagcache, id);
259 }
260 
261 const struct got_error *
262 open_repo(struct got_repository *repo, const char *path)
263 {
264 	const struct got_error *err = NULL;
265 	struct got_worktree *worktree = NULL;
266 
267 	/* bare git repository? */
268 	repo->path_git_dir = strdup(path);
269 	if (repo->path_git_dir == NULL) {
270 		err = got_error_from_errno();
271 		goto done;
272 	}
273 	if (is_git_repo(repo)) {
274 		repo->path = strdup(repo->path_git_dir);
275 		if (repo->path == NULL) {
276 			err = got_error_from_errno();
277 			goto done;
278 		}
279 		return NULL;
280 	}
281 
282 	/* git repository with working tree? */
283 	free(repo->path_git_dir);
284 	if (asprintf(&repo->path_git_dir, "%s/%s", path, GOT_GIT_DIR) == -1) {
285 		err = got_error_from_errno();
286 		goto done;
287 	}
288 	if (is_git_repo(repo)) {
289 		repo->path = strdup(path);
290 		if (repo->path == NULL) {
291 			err = got_error_from_errno();
292 			goto done;
293 		}
294 		return NULL;
295 	}
296 
297 	/* got work tree checked out from bare git repository? */
298 	free(repo->path_git_dir);
299 	repo->path_git_dir = NULL;
300 	err = got_worktree_open(&worktree, path);
301 	if (err) {
302 		if (err->code == GOT_ERR_ERRNO && errno == ENOENT)
303 			err = got_error(GOT_ERR_NOT_GIT_REPO);
304 		goto done;
305 	}
306 	repo->path_git_dir = strdup(worktree->repo_path);
307 	if (repo->path_git_dir == NULL) {
308 		err = got_error_from_errno();
309 		goto done;
310 	}
311 
312 	/* got work tree checked out from git repository with working tree? */
313 	if (!is_git_repo(repo)) {
314 		free(repo->path_git_dir);
315 		if (asprintf(&repo->path_git_dir, "%s/%s", worktree->repo_path,
316 		    GOT_GIT_DIR) == -1) {
317 			err = got_error_from_errno();
318 			repo->path_git_dir = NULL;
319 			goto done;
320 		}
321 		if (!is_git_repo(repo)) {
322 			err = got_error(GOT_ERR_NOT_GIT_REPO);
323 			goto done;
324 		}
325 		repo->path = strdup(worktree->repo_path);
326 		if (repo->path == NULL) {
327 			err = got_error_from_errno();
328 			goto done;
329 		}
330 	} else {
331 		repo->path = strdup(repo->path_git_dir);
332 		if (repo->path == NULL) {
333 			err = got_error_from_errno();
334 			goto done;
335 		}
336 	}
337 done:
338 	if (worktree)
339 		got_worktree_close(worktree);
340 	return err;
341 }
342 
343 const struct got_error *
344 got_repo_open(struct got_repository **repop, const char *path)
345 {
346 	struct got_repository *repo = NULL;
347 	const struct got_error *err = NULL;
348 	char *abspath, *normpath = NULL;
349 	int i, tried_root = 0;
350 
351 	*repop = NULL;
352 
353 	if (got_path_is_absolute(path))
354 		abspath = strdup(path);
355 	else
356 		abspath = got_path_get_absolute(path);
357 	if (abspath == NULL)
358 		return got_error(GOT_ERR_BAD_PATH);
359 
360 	repo = calloc(1, sizeof(*repo));
361 	if (repo == NULL) {
362 		err = got_error_from_errno();
363 		goto done;
364 	}
365 
366 	for (i = 0; i < nitems(repo->privsep_children); i++) {
367 		memset(&repo->privsep_children[i], 0,
368 		    sizeof(repo->privsep_children[0]));
369 		repo->privsep_children[i].imsg_fd = -1;
370 	}
371 
372 	err = got_object_cache_init(&repo->objcache,
373 	    GOT_OBJECT_CACHE_TYPE_OBJ);
374 	if (err)
375 		goto done;
376 	err = got_object_cache_init(&repo->treecache,
377 	    GOT_OBJECT_CACHE_TYPE_TREE);
378 	if (err)
379 		goto done;
380 	err = got_object_cache_init(&repo->commitcache,
381 	    GOT_OBJECT_CACHE_TYPE_COMMIT);
382 	if (err)
383 		goto done;
384 	err = got_object_cache_init(&repo->tagcache,
385 	    GOT_OBJECT_CACHE_TYPE_TAG);
386 	if (err)
387 		goto done;
388 
389 	normpath = got_path_normalize(abspath);
390 	if (normpath == NULL) {
391 		err = got_error(GOT_ERR_BAD_PATH);
392 		goto done;
393 	}
394 
395 	path = normpath;
396 	do {
397 		err = open_repo(repo, path);
398 		if (err == NULL)
399 			break;
400 		if (err->code != GOT_ERR_NOT_GIT_REPO)
401 			break;
402 		if (path[0] == '/' && path[1] == '\0') {
403 			if (tried_root) {
404 				err = got_error(GOT_ERR_NOT_GIT_REPO);
405 				break;
406 			}
407 			tried_root = 1;
408 		}
409 		path = dirname(path);
410 		if (path == NULL)
411 			err = got_error_from_errno();
412 	} while (path);
413 done:
414 	if (err)
415 		got_repo_close(repo);
416 	else
417 		*repop = repo;
418 	free(abspath);
419 	free(normpath);
420 	return err;
421 }
422 
423 const struct got_error *
424 got_repo_close(struct got_repository *repo)
425 {
426 	const struct got_error *err = NULL, *child_err;
427 	int i;
428 
429 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
430 		if (repo->packidx_cache[i] == NULL)
431 			break;
432 		got_packidx_close(repo->packidx_cache[i]);
433 	}
434 
435 	for (i = 0; i < nitems(repo->packs); i++) {
436 		if (repo->packs[i].path_packfile == NULL)
437 			break;
438 		got_pack_close(&repo->packs[i]);
439 	}
440 
441 	free(repo->path);
442 	free(repo->path_git_dir);
443 
444 	got_object_cache_close(&repo->objcache);
445 	got_object_cache_close(&repo->treecache);
446 	got_object_cache_close(&repo->commitcache);
447 	got_object_cache_close(&repo->tagcache);
448 
449 	for (i = 0; i < nitems(repo->privsep_children); i++) {
450 		if (repo->privsep_children[i].imsg_fd == -1)
451 			continue;
452 		imsg_clear(repo->privsep_children[i].ibuf);
453 		free(repo->privsep_children[i].ibuf);
454 		err = got_privsep_send_stop(repo->privsep_children[i].imsg_fd);
455 		child_err = got_privsep_wait_for_child(
456 		    repo->privsep_children[i].pid);
457 		if (child_err && err == NULL)
458 			err = child_err;
459 		close(repo->privsep_children[i].imsg_fd);
460 	}
461 	free(repo);
462 
463 	return err;
464 }
465 
466 const struct got_error *
467 got_repo_map_path(char **in_repo_path, struct got_repository *repo,
468     const char *input_path, int check_disk)
469 {
470 	const struct got_error *err = NULL;
471 	const char *repo_abspath = NULL;
472 	struct stat sb;
473 	size_t repolen, cwdlen, len;
474 	char *cwd, *canonpath, *path = NULL;
475 
476 	*in_repo_path = NULL;
477 
478 	cwd = getcwd(NULL, 0);
479 	if (cwd == NULL)
480 		return got_error_from_errno();
481 
482 	canonpath = strdup(input_path);
483 	if (canonpath == NULL) {
484 		err = got_error_from_errno();
485 		goto done;
486 	}
487 	err = got_canonpath(input_path, canonpath, strlen(canonpath) + 1);
488 	if (err)
489 		goto done;
490 
491 	repo_abspath = got_repo_get_path(repo);
492 
493 	/* TODO: Call "get in-repository path of work-tree node" API. */
494 
495 	if (!check_disk)
496 		path = strdup(canonpath);
497 	else if (lstat(canonpath, &sb) != 0) {
498 		if (errno != ENOENT) {
499 			err = got_error_from_errno();
500 			goto done;
501 		}
502 		/*
503 		 * Path is not on disk.
504 		 * Assume it is already relative to repository root.
505 		 */
506 		path = strdup(canonpath);
507 	} else {
508 		int is_repo_child = 0, is_cwd_child = 0;
509 
510 		path = realpath(canonpath, NULL);
511 		if (path == NULL) {
512 			err = got_error_from_errno();
513 			goto done;
514 		}
515 
516 		repolen = strlen(repo_abspath);
517 		cwdlen = strlen(cwd);
518 		len = strlen(path);
519 
520 		if (len > repolen && strncmp(path, repo_abspath, repolen) == 0)
521 			is_repo_child = 1;
522 		if (len > cwdlen && strncmp(path, cwd, cwdlen) == 0)
523 			is_cwd_child = 1;
524 
525 		if (strcmp(path, repo_abspath) == 0) {
526 			free(path);
527 			path = strdup("");
528 			if (path == NULL) {
529 				err = got_error_from_errno();
530 				goto done;
531 			}
532 		} else if (is_repo_child && is_cwd_child) {
533 			char *child;
534 			/* TODO: Is path inside a got worktree? */
535 			/* Strip common prefix with repository path. */
536 			err = got_path_skip_common_ancestor(&child,
537 			    repo_abspath, path);
538 			if (err)
539 				goto done;
540 			free(path);
541 			path = child;
542 		} else if (is_repo_child) {
543 			/* Matched an on-disk path inside repository. */
544 			if (got_repo_is_bare(repo)) {
545 				/*
546 				 * Matched an on-disk path inside repository
547 				 * database. Treat as repository-relative.
548 				 */
549 			} else {
550 				char *child;
551 				/* Strip common prefix with repository path. */
552 				err = got_path_skip_common_ancestor(&child,
553 				    repo_abspath, path);
554 				if (err)
555 					goto done;
556 				free(path);
557 				path = child;
558 			}
559 		} else if (is_cwd_child) {
560 			char *child;
561 			/* TODO: Is path inside a got worktree? */
562 			/* Strip common prefix with cwd. */
563 			err = got_path_skip_common_ancestor(&child, cwd,
564 			    path);
565 			if (err)
566 				goto done;
567 			free(path);
568 			path = child;
569 		} else {
570 			/*
571 			 * Matched unrelated on-disk path.
572 			 * Treat it as repository-relative.
573 			 */
574 		}
575 	}
576 
577 	/* Make in-repository path absolute */
578 	if (path[0] != '/') {
579 		char *abspath;
580 		if (asprintf(&abspath, "/%s", path) == -1) {
581 			err = got_error_from_errno();
582 			goto done;
583 		}
584 		free(path);
585 		path = abspath;
586 	}
587 
588 done:
589 	free(cwd);
590 	free(canonpath);
591 	if (err)
592 		free(path);
593 	else
594 		*in_repo_path = path;
595 	return err;
596 }
597 
598 const struct got_error *
599 got_repo_cache_packidx(struct got_repository *repo, struct got_packidx *packidx)
600 {
601 	const struct got_error *err = NULL;
602 	int i;
603 
604 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
605 		if (repo->packidx_cache[i] == NULL)
606 			break;
607 	}
608 	if (i == nitems(repo->packidx_cache)) {
609 		err = got_packidx_close(repo->packidx_cache[i - 1]);
610 		if (err)
611 			return err;
612 	}
613 
614 	/*
615 	 * Insert the new pack index at the front so it will
616 	 * be searched first in the future.
617 	 */
618 	memmove(&repo->packidx_cache[1], &repo->packidx_cache[0],
619 	    sizeof(repo->packidx_cache) -
620 	    sizeof(repo->packidx_cache[0]));
621 	repo->packidx_cache[0] = packidx;
622 
623 	return NULL;
624 }
625 
626 static int
627 is_packidx_filename(const char *name, size_t len)
628 {
629 	if (len != GOT_PACKIDX_NAMELEN)
630 		return 0;
631 
632 	if (strncmp(name, GOT_PACK_PREFIX, strlen(GOT_PACK_PREFIX)) != 0)
633 		return 0;
634 
635 	if (strcmp(name + strlen(GOT_PACK_PREFIX) +
636 	    SHA1_DIGEST_STRING_LENGTH - 1, GOT_PACKIDX_SUFFIX) != 0)
637 		return 0;
638 
639 	return 1;
640 }
641 
642 const struct got_error *
643 got_repo_search_packidx(struct got_packidx **packidx, int *idx,
644     struct got_repository *repo, struct got_object_id *id)
645 {
646 	const struct got_error *err;
647 	char *path_packdir;
648 	DIR *packdir;
649 	struct dirent *dent;
650 	char *path_packidx;
651 	int i;
652 
653 	/* Search pack index cache. */
654 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
655 		if (repo->packidx_cache[i] == NULL)
656 			break;
657 		*idx = got_packidx_get_object_idx(repo->packidx_cache[i], id);
658 		if (*idx != -1) {
659 			*packidx = repo->packidx_cache[i];
660 			return NULL;
661 		}
662 	}
663 	/* No luck. Search the filesystem. */
664 
665 	path_packdir = got_repo_get_path_objects_pack(repo);
666 	if (path_packdir == NULL)
667 		return got_error_from_errno();
668 
669 	packdir = opendir(path_packdir);
670 	if (packdir == NULL) {
671 		err = got_error_from_errno();
672 		goto done;
673 	}
674 
675 	while ((dent = readdir(packdir)) != NULL) {
676 		if (!is_packidx_filename(dent->d_name, dent->d_namlen))
677 			continue;
678 
679 		if (asprintf(&path_packidx, "%s/%s", path_packdir,
680 		    dent->d_name) == -1) {
681 			err = got_error_from_errno();
682 			goto done;
683 		}
684 
685 		err = got_packidx_open(packidx, path_packidx, 0);
686 		free(path_packidx);
687 		if (err)
688 			goto done;
689 
690 		*idx = got_packidx_get_object_idx(*packidx, id);
691 		if (*idx != -1) {
692 			err = NULL; /* found the object */
693 			err = got_repo_cache_packidx(repo, *packidx);
694 			goto done;
695 		}
696 
697 		err = got_packidx_close(*packidx);
698 		*packidx = NULL;
699 		if (err)
700 			goto done;
701 	}
702 
703 	err = got_error_no_obj(id);
704 done:
705 	free(path_packdir);
706 	if (packdir && closedir(packdir) != 0 && err == 0)
707 		err = got_error_from_errno();
708 	return err;
709 }
710 
711 static const struct got_error *
712 read_packfile_hdr(int fd, struct got_packidx *packidx)
713 {
714 	const struct got_error *err = NULL;
715 	uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
716 	struct got_packfile_hdr hdr;
717 	ssize_t n;
718 
719 	n = read(fd, &hdr, sizeof(hdr));
720 	if (n < 0)
721 		return got_error_from_errno();
722 	if (n != sizeof(hdr))
723 		return got_error(GOT_ERR_BAD_PACKFILE);
724 
725 	if (betoh32(hdr.signature) != GOT_PACKFILE_SIGNATURE ||
726 	    betoh32(hdr.version) != GOT_PACKFILE_VERSION ||
727 	    betoh32(hdr.nobjects) != totobj)
728 		err = got_error(GOT_ERR_BAD_PACKFILE);
729 
730 	return err;
731 }
732 
733 static const struct got_error *
734 open_packfile(int *fd, const char *path_packfile, struct got_packidx *packidx)
735 {
736 	const struct got_error *err = NULL;
737 
738 	*fd = open(path_packfile, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
739 	if (*fd == -1)
740 		return got_error_from_errno();
741 
742 	if (packidx) {
743 		err = read_packfile_hdr(*fd, packidx);
744 		if (err) {
745 			close(*fd);
746 			*fd = -1;
747 		}
748 	}
749 
750 	return err;
751 }
752 
753 const struct got_error *
754 got_repo_cache_pack(struct got_pack **packp, struct got_repository *repo,
755     const char *path_packfile, struct got_packidx *packidx)
756 {
757 	const struct got_error *err = NULL;
758 	struct got_pack *pack = NULL;
759 	int i;
760 
761 	if (packp)
762 		*packp = NULL;
763 
764 	for (i = 0; i < nitems(repo->packs); i++) {
765 		pack = &repo->packs[i];
766 		if (pack->path_packfile == NULL)
767 			break;
768 		if (strcmp(pack->path_packfile, path_packfile) == 0)
769 			return NULL;
770 	}
771 
772 	if (i == nitems(repo->packs) - 1) {
773 		err = got_pack_close(&repo->packs[i - 1]);
774 		if (err)
775 			return err;
776 		memmove(&repo->packs[1], &repo->packs[0],
777 		    sizeof(repo->packs) - sizeof(repo->packs[0]));
778 		i = 0;
779 	}
780 
781 	pack = &repo->packs[i];
782 
783 	pack->path_packfile = strdup(path_packfile);
784 	if (pack->path_packfile == NULL) {
785 		err = got_error_from_errno();
786 		goto done;
787 	}
788 
789 	err = open_packfile(&pack->fd, path_packfile, packidx);
790 	if (err)
791 		goto done;
792 
793 	err = got_pack_get_packfile_size(&pack->filesize, path_packfile);
794 	if (err)
795 		goto done;
796 
797 	pack->privsep_child = NULL;
798 
799 #ifndef GOT_PACK_NO_MMAP
800 	pack->map = mmap(NULL, pack->filesize, PROT_READ, MAP_PRIVATE,
801 	    pack->fd, 0);
802 	if (pack->map == MAP_FAILED)
803 		pack->map = NULL; /* fall back to read(2) */
804 #endif
805 done:
806 	if (err) {
807 		if (pack) {
808 			free(pack->path_packfile);
809 			memset(pack, 0, sizeof(*pack));
810 		}
811 	} else if (packp)
812 		*packp = pack;
813 	return err;
814 }
815 
816 struct got_pack *
817 got_repo_get_cached_pack(struct got_repository *repo, const char *path_packfile)
818 {
819 	struct got_pack *pack = NULL;
820 	int i;
821 
822 	for (i = 0; i < nitems(repo->packs); i++) {
823 		pack = &repo->packs[i];
824 		if (pack->path_packfile == NULL)
825 			break;
826 		if (strcmp(pack->path_packfile, path_packfile) == 0)
827 			return pack;
828 	}
829 
830 	return NULL;
831 }