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Date:: Mon Nov 5 11:39:49 2018 UTC
Message:: add an object cache for mini commits
Actions:: History | Blame | Raw File
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 got_repo_cache_mini_commit(struct got_repository *repo,
236     struct got_object_id *id, struct got_commit_object_mini *commit)
237 {
238 #ifndef GOT_NO_OBJ_CACHE
239 	const struct got_error *err = NULL;
240 	err = got_object_cache_add(&repo->minicommitcache, id, commit);
241 	if (err)
242 		return err;
243 	commit->refcnt++;
244 #endif
245 	return NULL;
246 }
247 
248 struct got_commit_object_mini *
249 got_repo_get_cached_mini_commit(struct got_repository *repo,
250     struct got_object_id *id)
251 {
252 	return (struct got_commit_object_mini *)got_object_cache_get(
253 	    &repo->minicommitcache, id);
254 }
255 
256 const struct got_error *
257 open_repo(struct got_repository *repo, const char *path)
258 {
259 	const struct got_error *err = NULL;
260 	struct got_worktree *worktree = NULL;
261 
262 	/* bare git repository? */
263 	repo->path_git_dir = strdup(path);
264 	if (repo->path_git_dir == NULL) {
265 		err = got_error_from_errno();
266 		goto done;
267 	}
268 	if (is_git_repo(repo)) {
269 		repo->path = strdup(repo->path_git_dir);
270 		if (repo->path == NULL) {
271 			err = got_error_from_errno();
272 			goto done;
273 		}
274 		return NULL;
275 	}
276 
277 	/* git repository with working tree? */
278 	free(repo->path_git_dir);
279 	if (asprintf(&repo->path_git_dir, "%s/%s", path, GOT_GIT_DIR) == -1) {
280 		err = got_error_from_errno();
281 		goto done;
282 	}
283 	if (is_git_repo(repo)) {
284 		repo->path = strdup(path);
285 		if (repo->path == NULL) {
286 			err = got_error_from_errno();
287 			goto done;
288 		}
289 		return NULL;
290 	}
291 
292 	/* got work tree checked out from bare git repository? */
293 	free(repo->path_git_dir);
294 	repo->path_git_dir = NULL;
295 	err = got_worktree_open(&worktree, path);
296 	if (err) {
297 		if (err->code == GOT_ERR_ERRNO && errno == ENOENT)
298 			err = got_error(GOT_ERR_NOT_GIT_REPO);
299 		goto done;
300 	}
301 	repo->path_git_dir = strdup(worktree->repo_path);
302 	if (repo->path_git_dir == NULL) {
303 		err = got_error_from_errno();
304 		goto done;
305 	}
306 
307 	/* got work tree checked out from git repository with working tree? */
308 	if (!is_git_repo(repo)) {
309 		free(repo->path_git_dir);
310 		if (asprintf(&repo->path_git_dir, "%s/%s", worktree->repo_path,
311 		    GOT_GIT_DIR) == -1) {
312 			err = got_error_from_errno();
313 			repo->path_git_dir = NULL;
314 			goto done;
315 		}
316 		if (!is_git_repo(repo)) {
317 			err = got_error(GOT_ERR_NOT_GIT_REPO);
318 			goto done;
319 		}
320 		repo->path = strdup(worktree->repo_path);
321 		if (repo->path == NULL) {
322 			err = got_error_from_errno();
323 			goto done;
324 		}
325 	} else {
326 		repo->path = strdup(repo->path_git_dir);
327 		if (repo->path == NULL) {
328 			err = got_error_from_errno();
329 			goto done;
330 		}
331 	}
332 done:
333 	if (worktree)
334 		got_worktree_close(worktree);
335 	return err;
336 }
337 
338 const struct got_error *
339 got_repo_open(struct got_repository **repop, const char *path)
340 {
341 	struct got_repository *repo = NULL;
342 	const struct got_error *err = NULL;
343 	char *abspath, *normpath = NULL;
344 	int i, tried_root = 0;
345 
346 	*repop = NULL;
347 
348 	if (got_path_is_absolute(path))
349 		abspath = strdup(path);
350 	else
351 		abspath = got_path_get_absolute(path);
352 	if (abspath == NULL)
353 		return got_error(GOT_ERR_BAD_PATH);
354 
355 	repo = calloc(1, sizeof(*repo));
356 	if (repo == NULL) {
357 		err = got_error_from_errno();
358 		goto done;
359 	}
360 
361 	for (i = 0; i < nitems(repo->privsep_children); i++) {
362 		memset(&repo->privsep_children[i], 0,
363 		    sizeof(repo->privsep_children[0]));
364 		repo->privsep_children[i].imsg_fd = -1;
365 	}
366 
367 	err = got_object_cache_init(&repo->objcache,
368 	    GOT_OBJECT_CACHE_TYPE_OBJ);
369 	if (err)
370 		goto done;
371 	err = got_object_cache_init(&repo->treecache,
372 	    GOT_OBJECT_CACHE_TYPE_TREE);
373 	if (err)
374 		goto done;
375 	err = got_object_cache_init(&repo->commitcache,
376 	    GOT_OBJECT_CACHE_TYPE_COMMIT);
377 	if (err)
378 		goto done;
379 	err = got_object_cache_init(&repo->minicommitcache,
380 	    GOT_OBJECT_CACHE_TYPE_MINI_COMMIT);
381 	if (err)
382 		goto done;
383 
384 	normpath = got_path_normalize(abspath);
385 	if (normpath == NULL) {
386 		err = got_error(GOT_ERR_BAD_PATH);
387 		goto done;
388 	}
389 
390 	path = normpath;
391 	do {
392 		err = open_repo(repo, path);
393 		if (err == NULL)
394 			break;
395 		if (err->code != GOT_ERR_NOT_GIT_REPO)
396 			break;
397 		if (path[0] == '/' && path[1] == '\0') {
398 			if (tried_root) {
399 				err = got_error(GOT_ERR_NOT_GIT_REPO);
400 				break;
401 			}
402 			tried_root = 1;
403 		}
404 		path = dirname(path);
405 		if (path == NULL)
406 			err = got_error_from_errno();
407 	} while (path);
408 done:
409 	if (err)
410 		got_repo_close(repo);
411 	else
412 		*repop = repo;
413 	free(abspath);
414 	free(normpath);
415 	return err;
416 }
417 
418 const struct got_error *
419 got_repo_close(struct got_repository *repo)
420 {
421 	const struct got_error *err = NULL, *child_err;
422 	int i;
423 
424 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
425 		if (repo->packidx_cache[i] == NULL)
426 			break;
427 		got_packidx_close(repo->packidx_cache[i]);
428 	}
429 
430 	for (i = 0; i < nitems(repo->packs); i++) {
431 		if (repo->packs[i].path_packfile == NULL)
432 			break;
433 		got_pack_close(&repo->packs[i]);
434 	}
435 
436 	free(repo->path);
437 	free(repo->path_git_dir);
438 
439 	got_object_cache_close(&repo->objcache);
440 	got_object_cache_close(&repo->treecache);
441 	got_object_cache_close(&repo->commitcache);
442 	got_object_cache_close(&repo->minicommitcache);
443 
444 	for (i = 0; i < nitems(repo->privsep_children); i++) {
445 		if (repo->privsep_children[i].imsg_fd == -1)
446 			continue;
447 		imsg_clear(repo->privsep_children[i].ibuf);
448 		free(repo->privsep_children[i].ibuf);
449 		err = got_privsep_send_stop(repo->privsep_children[i].imsg_fd);
450 		child_err = got_privsep_wait_for_child(
451 		    repo->privsep_children[i].pid);
452 		if (child_err && err == NULL)
453 			err = child_err;
454 		close(repo->privsep_children[i].imsg_fd);
455 	}
456 	free(repo);
457 
458 	return err;
459 }
460 
461 const struct got_error *
462 got_repo_map_path(char **in_repo_path, struct got_repository *repo,
463     const char *input_path, int check_disk)
464 {
465 	const struct got_error *err = NULL;
466 	char *repo_abspath = NULL, *cwd = NULL;
467 	struct stat sb;
468 	size_t repolen, cwdlen, len;
469 	char *canonpath, *path = NULL;
470 
471 	*in_repo_path = NULL;
472 
473 	cwd = getcwd(NULL, 0);
474 	if (cwd == NULL)
475 		return got_error_from_errno();
476 
477 	canonpath = strdup(input_path);
478 	if (canonpath == NULL) {
479 		err = got_error_from_errno();
480 		goto done;
481 	}
482 	err = got_canonpath(input_path, canonpath, strlen(canonpath) + 1);
483 	if (err)
484 		goto done;
485 
486 	repo_abspath = got_repo_get_path(repo);
487 	if (repo_abspath == NULL) {
488 		err = got_error_from_errno();
489 		goto done;
490 	}
491 
492 	/* TODO: Call "get in-repository path of work-tree node" API. */
493 
494 	if (!check_disk)
495 		path = strdup(canonpath);
496 	else if (lstat(canonpath, &sb) != 0) {
497 		if (errno != ENOENT) {
498 			err = got_error_from_errno();
499 			goto done;
500 		}
501 		/*
502 		 * Path is not on disk.
503 		 * Assume it is already relative to repository root.
504 		 */
505 		path = strdup(canonpath);
506 	} else {
507 		int is_repo_child = 0, is_cwd_child = 0;
508 
509 		path = realpath(canonpath, NULL);
510 		if (path == NULL) {
511 			err = got_error_from_errno();
512 			goto done;
513 		}
514 
515 		repolen = strlen(repo_abspath);
516 		cwdlen = strlen(cwd);
517 		len = strlen(path);
518 
519 		if (len > repolen && strncmp(path, repo_abspath, repolen) == 0)
520 			is_repo_child = 1;
521 		if (len > cwdlen && strncmp(path, cwd, cwdlen) == 0)
522 			is_cwd_child = 1;
523 
524 		if (strcmp(path, repo_abspath) == 0) {
525 			free(path);
526 			path = strdup("");
527 			if (path == NULL) {
528 				err = got_error_from_errno();
529 				goto done;
530 			}
531 		} else if (is_repo_child && is_cwd_child) {
532 			char *child;
533 			/* TODO: Is path inside a got worktree? */
534 			/* Strip common prefix with repository path. */
535 			err = got_path_skip_common_ancestor(&child,
536 			    repo_abspath, path);
537 			if (err)
538 				goto done;
539 			free(path);
540 			path = child;
541 		} else if (is_repo_child) {
542 			/* Matched an on-disk path inside repository. */
543 			if (got_repo_is_bare(repo)) {
544 				/*
545 				 * Matched an on-disk path inside repository
546 				 * database. Treat as repository-relative.
547 				 */
548 			} else {
549 				char *child;
550 				/* Strip common prefix with repository path. */
551 				err = got_path_skip_common_ancestor(&child,
552 				    repo_abspath, path);
553 				if (err)
554 					goto done;
555 				free(path);
556 				path = child;
557 			}
558 		} else if (is_cwd_child) {
559 			char *child;
560 			/* TODO: Is path inside a got worktree? */
561 			/* Strip common prefix with cwd. */
562 			err = got_path_skip_common_ancestor(&child, cwd,
563 			    path);
564 			if (err)
565 				goto done;
566 			free(path);
567 			path = child;
568 		} else {
569 			/*
570 			 * Matched unrelated on-disk path.
571 			 * Treat it as repository-relative.
572 			 */
573 		}
574 	}
575 
576 	/* Make in-repository path absolute */
577 	if (path[0] != '/') {
578 		char *abspath;
579 		if (asprintf(&abspath, "/%s", path) == -1) {
580 			err = got_error_from_errno();
581 			goto done;
582 		}
583 		free(path);
584 		path = abspath;
585 	}
586 
587 done:
588 	free(repo_abspath);
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 
609 	if (i == nitems(repo->packidx_cache)) {
610 		err = got_packidx_close(repo->packidx_cache[i - 1]);
611 		if (err)
612 			return err;
613 		memmove(&repo->packidx_cache[1], &repo->packidx_cache[0],
614 		    sizeof(repo->packidx_cache) -
615 		    sizeof(repo->packidx_cache[0]));
616 		i = 0;
617 	}
618 
619 	repo->packidx_cache[i] = packidx;
620 	return NULL;
621 }
622 
623 static int
624 is_packidx_filename(const char *name, size_t len)
625 {
626 	if (len != GOT_PACKIDX_NAMELEN)
627 		return 0;
628 
629 	if (strncmp(name, GOT_PACK_PREFIX, strlen(GOT_PACK_PREFIX)) != 0)
630 		return 0;
631 
632 	if (strcmp(name + strlen(GOT_PACK_PREFIX) +
633 	    SHA1_DIGEST_STRING_LENGTH - 1, GOT_PACKIDX_SUFFIX) != 0)
634 		return 0;
635 
636 	return 1;
637 }
638 
639 const struct got_error *
640 got_repo_search_packidx(struct got_packidx **packidx, int *idx,
641     struct got_repository *repo, struct got_object_id *id)
642 {
643 	const struct got_error *err;
644 	char *path_packdir;
645 	DIR *packdir;
646 	struct dirent *dent;
647 	char *path_packidx;
648 	int i;
649 
650 	/* Search pack index cache. */
651 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
652 		if (repo->packidx_cache[i] == NULL)
653 			break;
654 		*idx = got_packidx_get_object_idx(repo->packidx_cache[i], id);
655 		if (*idx != -1) {
656 			*packidx = repo->packidx_cache[i];
657 			return NULL;
658 		}
659 	}
660 	/* No luck. Search the filesystem. */
661 
662 	path_packdir = got_repo_get_path_objects_pack(repo);
663 	if (path_packdir == NULL)
664 		return got_error_from_errno();
665 
666 	packdir = opendir(path_packdir);
667 	if (packdir == NULL) {
668 		err = got_error_from_errno();
669 		goto done;
670 	}
671 
672 	while ((dent = readdir(packdir)) != NULL) {
673 		if (!is_packidx_filename(dent->d_name, dent->d_namlen))
674 			continue;
675 
676 		if (asprintf(&path_packidx, "%s/%s", path_packdir,
677 		    dent->d_name) == -1) {
678 			err = got_error_from_errno();
679 			goto done;
680 		}
681 
682 		err = got_packidx_open(packidx, path_packidx, 0);
683 		free(path_packidx);
684 		if (err)
685 			goto done;
686 
687 		*idx = got_packidx_get_object_idx(*packidx, id);
688 		if (*idx != -1) {
689 			err = NULL; /* found the object */
690 			err = got_repo_cache_packidx(repo, *packidx);
691 			goto done;
692 		}
693 
694 		err = got_packidx_close(*packidx);
695 		*packidx = NULL;
696 		if (err)
697 			goto done;
698 	}
699 
700 	err = got_error(GOT_ERR_NO_OBJ);
701 done:
702 	free(path_packdir);
703 	if (packdir && closedir(packdir) != 0 && err == 0)
704 		err = got_error_from_errno();
705 	return err;
706 }
707 
708 static const struct got_error *
709 read_packfile_hdr(int fd, struct got_packidx *packidx)
710 {
711 	const struct got_error *err = NULL;
712 	uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
713 	struct got_packfile_hdr hdr;
714 	ssize_t n;
715 
716 	n = read(fd, &hdr, sizeof(hdr));
717 	if (n < 0)
718 		return got_error_from_errno();
719 	if (n != sizeof(hdr))
720 		return got_error(GOT_ERR_BAD_PACKFILE);
721 
722 	if (betoh32(hdr.signature) != GOT_PACKFILE_SIGNATURE ||
723 	    betoh32(hdr.version) != GOT_PACKFILE_VERSION ||
724 	    betoh32(hdr.nobjects) != totobj)
725 		err = got_error(GOT_ERR_BAD_PACKFILE);
726 
727 	return err;
728 }
729 
730 static const struct got_error *
731 open_packfile(int *fd, const char *path_packfile, struct got_packidx *packidx)
732 {
733 	const struct got_error *err = NULL;
734 
735 	*fd = open(path_packfile, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
736 	if (*fd == -1)
737 		return got_error_from_errno();
738 
739 	if (packidx) {
740 		err = read_packfile_hdr(*fd, packidx);
741 		if (err) {
742 			close(*fd);
743 			*fd = -1;
744 		}
745 	}
746 
747 	return err;
748 }
749 
750 const struct got_error *
751 got_repo_cache_pack(struct got_pack **packp, struct got_repository *repo,
752     const char *path_packfile, struct got_packidx *packidx)
753 {
754 	const struct got_error *err = NULL;
755 	struct got_pack *pack = NULL;
756 	int i;
757 
758 	if (packp)
759 		*packp = NULL;
760 
761 	for (i = 0; i < nitems(repo->packs); i++) {
762 		pack = &repo->packs[i];
763 		if (pack->path_packfile == NULL)
764 			break;
765 		if (strcmp(pack->path_packfile, path_packfile) == 0)
766 			return NULL;
767 	}
768 
769 	if (i == nitems(repo->packs) - 1) {
770 		err = got_pack_close(&repo->packs[i - 1]);
771 		if (err)
772 			return err;
773 		memmove(&repo->packs[1], &repo->packs[0],
774 		    sizeof(repo->packs) - sizeof(repo->packs[0]));
775 		i = 0;
776 	}
777 
778 	pack = &repo->packs[i];
779 
780 	pack->path_packfile = strdup(path_packfile);
781 	if (pack->path_packfile == NULL) {
782 		err = got_error_from_errno();
783 		goto done;
784 	}
785 
786 	err = open_packfile(&pack->fd, path_packfile, packidx);
787 	if (err)
788 		goto done;
789 
790 	err = got_pack_get_packfile_size(&pack->filesize, path_packfile);
791 	if (err)
792 		goto done;
793 
794 	pack->privsep_child = NULL;
795 
796 #ifndef GOT_PACK_NO_MMAP
797 	pack->map = mmap(NULL, pack->filesize, PROT_READ, MAP_PRIVATE,
798 	    pack->fd, 0);
799 	if (pack->map == MAP_FAILED)
800 		pack->map = NULL; /* fall back to read(2) */
801 #endif
802 done:
803 	if (err) {
804 		if (pack) {
805 			free(pack->path_packfile);
806 			memset(pack, 0, sizeof(*pack));
807 		}
808 	} else if (packp)
809 		*packp = pack;
810 	return err;
811 }
812 
813 struct got_pack *
814 got_repo_get_cached_pack(struct got_repository *repo, const char *path_packfile)
815 {
816 	struct got_pack *pack = NULL;
817 	int i;
818 
819 	for (i = 0; i < nitems(repo->packs); i++) {
820 		pack = &repo->packs[i];
821 		if (pack->path_packfile == NULL)
822 			break;
823 		if (strcmp(pack->path_packfile, path_packfile) == 0)
824 			return pack;
825 	}
826 
827 	return NULL;
828 }