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Date:: Tue Feb 5 15:33:30 2019 UTC
Message:: stop checking for a worktree in open_repo()
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 
266 	/* bare git repository? */
267 	repo->path_git_dir = strdup(path);
268 	if (repo->path_git_dir == NULL)
269 		return got_error_from_errno();
270 	if (is_git_repo(repo)) {
271 		repo->path = strdup(repo->path_git_dir);
272 		if (repo->path == NULL) {
273 			err = got_error_from_errno();
274 			goto done;
275 		}
276 		return NULL;
277 	}
278 
279 	/* git repository with working tree? */
280 	free(repo->path_git_dir);
281 	if (asprintf(&repo->path_git_dir, "%s/%s", path, GOT_GIT_DIR) == -1) {
282 		err = got_error_from_errno();
283 		goto done;
284 	}
285 	if (is_git_repo(repo)) {
286 		repo->path = strdup(path);
287 		if (repo->path == NULL) {
288 			err = got_error_from_errno();
289 			goto done;
290 		}
291 		return NULL;
292 	}
293 
294 	err = got_error(GOT_ERR_NOT_GIT_REPO);
295 done:
296 	if (err) {
297 		free(repo->path);
298 		repo->path = NULL;
299 		free(repo->path_git_dir);
300 		repo->path_git_dir = NULL;
301 	}
302 	return err;
303 }
304 
305 const struct got_error *
306 got_repo_open(struct got_repository **repop, const char *path)
307 {
308 	struct got_repository *repo = NULL;
309 	const struct got_error *err = NULL;
310 	char *abspath, *normpath = NULL;
311 	int i, tried_root = 0;
312 
313 	*repop = NULL;
314 
315 	if (got_path_is_absolute(path))
316 		abspath = strdup(path);
317 	else
318 		abspath = got_path_get_absolute(path);
319 	if (abspath == NULL)
320 		return got_error(GOT_ERR_BAD_PATH);
321 
322 	repo = calloc(1, sizeof(*repo));
323 	if (repo == NULL) {
324 		err = got_error_from_errno();
325 		goto done;
326 	}
327 
328 	for (i = 0; i < nitems(repo->privsep_children); i++) {
329 		memset(&repo->privsep_children[i], 0,
330 		    sizeof(repo->privsep_children[0]));
331 		repo->privsep_children[i].imsg_fd = -1;
332 	}
333 
334 	err = got_object_cache_init(&repo->objcache,
335 	    GOT_OBJECT_CACHE_TYPE_OBJ);
336 	if (err)
337 		goto done;
338 	err = got_object_cache_init(&repo->treecache,
339 	    GOT_OBJECT_CACHE_TYPE_TREE);
340 	if (err)
341 		goto done;
342 	err = got_object_cache_init(&repo->commitcache,
343 	    GOT_OBJECT_CACHE_TYPE_COMMIT);
344 	if (err)
345 		goto done;
346 	err = got_object_cache_init(&repo->tagcache,
347 	    GOT_OBJECT_CACHE_TYPE_TAG);
348 	if (err)
349 		goto done;
350 
351 	normpath = got_path_normalize(abspath);
352 	if (normpath == NULL) {
353 		err = got_error(GOT_ERR_BAD_PATH);
354 		goto done;
355 	}
356 
357 	path = normpath;
358 	do {
359 		err = open_repo(repo, path);
360 		if (err == NULL)
361 			break;
362 		if (err->code != GOT_ERR_NOT_GIT_REPO)
363 			break;
364 		if (path[0] == '/' && path[1] == '\0') {
365 			if (tried_root) {
366 				err = got_error(GOT_ERR_NOT_GIT_REPO);
367 				break;
368 			}
369 			tried_root = 1;
370 		}
371 		path = dirname(path);
372 		if (path == NULL)
373 			err = got_error_from_errno();
374 	} while (path);
375 done:
376 	if (err)
377 		got_repo_close(repo);
378 	else
379 		*repop = repo;
380 	free(abspath);
381 	free(normpath);
382 	return err;
383 }
384 
385 const struct got_error *
386 got_repo_close(struct got_repository *repo)
387 {
388 	const struct got_error *err = NULL, *child_err;
389 	int i;
390 
391 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
392 		if (repo->packidx_cache[i] == NULL)
393 			break;
394 		got_packidx_close(repo->packidx_cache[i]);
395 	}
396 
397 	for (i = 0; i < nitems(repo->packs); i++) {
398 		if (repo->packs[i].path_packfile == NULL)
399 			break;
400 		got_pack_close(&repo->packs[i]);
401 	}
402 
403 	free(repo->path);
404 	free(repo->path_git_dir);
405 
406 	got_object_cache_close(&repo->objcache);
407 	got_object_cache_close(&repo->treecache);
408 	got_object_cache_close(&repo->commitcache);
409 	got_object_cache_close(&repo->tagcache);
410 
411 	for (i = 0; i < nitems(repo->privsep_children); i++) {
412 		if (repo->privsep_children[i].imsg_fd == -1)
413 			continue;
414 		imsg_clear(repo->privsep_children[i].ibuf);
415 		free(repo->privsep_children[i].ibuf);
416 		err = got_privsep_send_stop(repo->privsep_children[i].imsg_fd);
417 		child_err = got_privsep_wait_for_child(
418 		    repo->privsep_children[i].pid);
419 		if (child_err && err == NULL)
420 			err = child_err;
421 		close(repo->privsep_children[i].imsg_fd);
422 	}
423 	free(repo);
424 
425 	return err;
426 }
427 
428 const struct got_error *
429 got_repo_map_path(char **in_repo_path, struct got_repository *repo,
430     const char *input_path, int check_disk)
431 {
432 	const struct got_error *err = NULL;
433 	const char *repo_abspath = NULL;
434 	struct stat sb;
435 	size_t repolen, cwdlen, len;
436 	char *cwd, *canonpath, *path = NULL;
437 
438 	*in_repo_path = NULL;
439 
440 	cwd = getcwd(NULL, 0);
441 	if (cwd == NULL)
442 		return got_error_from_errno();
443 
444 	canonpath = strdup(input_path);
445 	if (canonpath == NULL) {
446 		err = got_error_from_errno();
447 		goto done;
448 	}
449 	err = got_canonpath(input_path, canonpath, strlen(canonpath) + 1);
450 	if (err)
451 		goto done;
452 
453 	repo_abspath = got_repo_get_path(repo);
454 
455 	/* TODO: Call "get in-repository path of work-tree node" API. */
456 
457 	if (!check_disk)
458 		path = strdup(canonpath);
459 	else if (lstat(canonpath, &sb) != 0) {
460 		if (errno != ENOENT) {
461 			err = got_error_from_errno();
462 			goto done;
463 		}
464 		/*
465 		 * Path is not on disk.
466 		 * Assume it is already relative to repository root.
467 		 */
468 		path = strdup(canonpath);
469 	} else {
470 		int is_repo_child = 0, is_cwd_child = 0;
471 
472 		path = realpath(canonpath, NULL);
473 		if (path == NULL) {
474 			err = got_error_from_errno();
475 			goto done;
476 		}
477 
478 		repolen = strlen(repo_abspath);
479 		cwdlen = strlen(cwd);
480 		len = strlen(path);
481 
482 		if (len > repolen && strncmp(path, repo_abspath, repolen) == 0)
483 			is_repo_child = 1;
484 		if (len > cwdlen && strncmp(path, cwd, cwdlen) == 0)
485 			is_cwd_child = 1;
486 
487 		if (strcmp(path, repo_abspath) == 0) {
488 			free(path);
489 			path = strdup("");
490 			if (path == NULL) {
491 				err = got_error_from_errno();
492 				goto done;
493 			}
494 		} else if (is_repo_child && is_cwd_child) {
495 			char *child;
496 			/* TODO: Is path inside a got worktree? */
497 			/* Strip common prefix with repository path. */
498 			err = got_path_skip_common_ancestor(&child,
499 			    repo_abspath, path);
500 			if (err)
501 				goto done;
502 			free(path);
503 			path = child;
504 		} else if (is_repo_child) {
505 			/* Matched an on-disk path inside repository. */
506 			if (got_repo_is_bare(repo)) {
507 				/*
508 				 * Matched an on-disk path inside repository
509 				 * database. Treat as repository-relative.
510 				 */
511 			} else {
512 				char *child;
513 				/* Strip common prefix with repository path. */
514 				err = got_path_skip_common_ancestor(&child,
515 				    repo_abspath, path);
516 				if (err)
517 					goto done;
518 				free(path);
519 				path = child;
520 			}
521 		} else if (is_cwd_child) {
522 			char *child;
523 			/* TODO: Is path inside a got worktree? */
524 			/* Strip common prefix with cwd. */
525 			err = got_path_skip_common_ancestor(&child, cwd,
526 			    path);
527 			if (err)
528 				goto done;
529 			free(path);
530 			path = child;
531 		} else {
532 			/*
533 			 * Matched unrelated on-disk path.
534 			 * Treat it as repository-relative.
535 			 */
536 		}
537 	}
538 
539 	/* Make in-repository path absolute */
540 	if (path[0] != '/') {
541 		char *abspath;
542 		if (asprintf(&abspath, "/%s", path) == -1) {
543 			err = got_error_from_errno();
544 			goto done;
545 		}
546 		free(path);
547 		path = abspath;
548 	}
549 
550 done:
551 	free(cwd);
552 	free(canonpath);
553 	if (err)
554 		free(path);
555 	else
556 		*in_repo_path = path;
557 	return err;
558 }
559 
560 const struct got_error *
561 got_repo_cache_packidx(struct got_repository *repo, struct got_packidx *packidx)
562 {
563 	const struct got_error *err = NULL;
564 	int i;
565 
566 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
567 		if (repo->packidx_cache[i] == NULL)
568 			break;
569 	}
570 	if (i == nitems(repo->packidx_cache)) {
571 		err = got_packidx_close(repo->packidx_cache[i - 1]);
572 		if (err)
573 			return err;
574 	}
575 
576 	/*
577 	 * Insert the new pack index at the front so it will
578 	 * be searched first in the future.
579 	 */
580 	memmove(&repo->packidx_cache[1], &repo->packidx_cache[0],
581 	    sizeof(repo->packidx_cache) -
582 	    sizeof(repo->packidx_cache[0]));
583 	repo->packidx_cache[0] = packidx;
584 
585 	return NULL;
586 }
587 
588 static int
589 is_packidx_filename(const char *name, size_t len)
590 {
591 	if (len != GOT_PACKIDX_NAMELEN)
592 		return 0;
593 
594 	if (strncmp(name, GOT_PACK_PREFIX, strlen(GOT_PACK_PREFIX)) != 0)
595 		return 0;
596 
597 	if (strcmp(name + strlen(GOT_PACK_PREFIX) +
598 	    SHA1_DIGEST_STRING_LENGTH - 1, GOT_PACKIDX_SUFFIX) != 0)
599 		return 0;
600 
601 	return 1;
602 }
603 
604 const struct got_error *
605 got_repo_search_packidx(struct got_packidx **packidx, int *idx,
606     struct got_repository *repo, struct got_object_id *id)
607 {
608 	const struct got_error *err;
609 	char *path_packdir;
610 	DIR *packdir;
611 	struct dirent *dent;
612 	char *path_packidx;
613 	int i;
614 
615 	/* Search pack index cache. */
616 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
617 		if (repo->packidx_cache[i] == NULL)
618 			break;
619 		*idx = got_packidx_get_object_idx(repo->packidx_cache[i], id);
620 		if (*idx != -1) {
621 			*packidx = repo->packidx_cache[i];
622 			return NULL;
623 		}
624 	}
625 	/* No luck. Search the filesystem. */
626 
627 	path_packdir = got_repo_get_path_objects_pack(repo);
628 	if (path_packdir == NULL)
629 		return got_error_from_errno();
630 
631 	packdir = opendir(path_packdir);
632 	if (packdir == NULL) {
633 		err = got_error_from_errno();
634 		goto done;
635 	}
636 
637 	while ((dent = readdir(packdir)) != NULL) {
638 		if (!is_packidx_filename(dent->d_name, dent->d_namlen))
639 			continue;
640 
641 		if (asprintf(&path_packidx, "%s/%s", path_packdir,
642 		    dent->d_name) == -1) {
643 			err = got_error_from_errno();
644 			goto done;
645 		}
646 
647 		err = got_packidx_open(packidx, path_packidx, 0);
648 		free(path_packidx);
649 		if (err)
650 			goto done;
651 
652 		*idx = got_packidx_get_object_idx(*packidx, id);
653 		if (*idx != -1) {
654 			err = NULL; /* found the object */
655 			err = got_repo_cache_packidx(repo, *packidx);
656 			goto done;
657 		}
658 
659 		err = got_packidx_close(*packidx);
660 		*packidx = NULL;
661 		if (err)
662 			goto done;
663 	}
664 
665 	err = got_error_no_obj(id);
666 done:
667 	free(path_packdir);
668 	if (packdir && closedir(packdir) != 0 && err == 0)
669 		err = got_error_from_errno();
670 	return err;
671 }
672 
673 static const struct got_error *
674 read_packfile_hdr(int fd, struct got_packidx *packidx)
675 {
676 	const struct got_error *err = NULL;
677 	uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
678 	struct got_packfile_hdr hdr;
679 	ssize_t n;
680 
681 	n = read(fd, &hdr, sizeof(hdr));
682 	if (n < 0)
683 		return got_error_from_errno();
684 	if (n != sizeof(hdr))
685 		return got_error(GOT_ERR_BAD_PACKFILE);
686 
687 	if (betoh32(hdr.signature) != GOT_PACKFILE_SIGNATURE ||
688 	    betoh32(hdr.version) != GOT_PACKFILE_VERSION ||
689 	    betoh32(hdr.nobjects) != totobj)
690 		err = got_error(GOT_ERR_BAD_PACKFILE);
691 
692 	return err;
693 }
694 
695 static const struct got_error *
696 open_packfile(int *fd, const char *path_packfile, struct got_packidx *packidx)
697 {
698 	const struct got_error *err = NULL;
699 
700 	*fd = open(path_packfile, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
701 	if (*fd == -1)
702 		return got_error_from_errno();
703 
704 	if (packidx) {
705 		err = read_packfile_hdr(*fd, packidx);
706 		if (err) {
707 			close(*fd);
708 			*fd = -1;
709 		}
710 	}
711 
712 	return err;
713 }
714 
715 const struct got_error *
716 got_repo_cache_pack(struct got_pack **packp, struct got_repository *repo,
717     const char *path_packfile, struct got_packidx *packidx)
718 {
719 	const struct got_error *err = NULL;
720 	struct got_pack *pack = NULL;
721 	int i;
722 
723 	if (packp)
724 		*packp = NULL;
725 
726 	for (i = 0; i < nitems(repo->packs); i++) {
727 		pack = &repo->packs[i];
728 		if (pack->path_packfile == NULL)
729 			break;
730 		if (strcmp(pack->path_packfile, path_packfile) == 0)
731 			return NULL;
732 	}
733 
734 	if (i == nitems(repo->packs) - 1) {
735 		err = got_pack_close(&repo->packs[i - 1]);
736 		if (err)
737 			return err;
738 		memmove(&repo->packs[1], &repo->packs[0],
739 		    sizeof(repo->packs) - sizeof(repo->packs[0]));
740 		i = 0;
741 	}
742 
743 	pack = &repo->packs[i];
744 
745 	pack->path_packfile = strdup(path_packfile);
746 	if (pack->path_packfile == NULL) {
747 		err = got_error_from_errno();
748 		goto done;
749 	}
750 
751 	err = open_packfile(&pack->fd, path_packfile, packidx);
752 	if (err)
753 		goto done;
754 
755 	err = got_pack_get_packfile_size(&pack->filesize, path_packfile);
756 	if (err)
757 		goto done;
758 
759 	pack->privsep_child = NULL;
760 
761 #ifndef GOT_PACK_NO_MMAP
762 	pack->map = mmap(NULL, pack->filesize, PROT_READ, MAP_PRIVATE,
763 	    pack->fd, 0);
764 	if (pack->map == MAP_FAILED)
765 		pack->map = NULL; /* fall back to read(2) */
766 #endif
767 done:
768 	if (err) {
769 		if (pack) {
770 			free(pack->path_packfile);
771 			memset(pack, 0, sizeof(*pack));
772 		}
773 	} else if (packp)
774 		*packp = pack;
775 	return err;
776 }
777 
778 struct got_pack *
779 got_repo_get_cached_pack(struct got_repository *repo, const char *path_packfile)
780 {
781 	struct got_pack *pack = NULL;
782 	int i;
783 
784 	for (i = 0; i < nitems(repo->packs); i++) {
785 		pack = &repo->packs[i];
786 		if (pack->path_packfile == NULL)
787 			break;
788 		if (strcmp(pack->path_packfile, path_packfile) == 0)
789 			return pack;
790 	}
791 
792 	return NULL;
793 }