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Date:: Thu Feb 21 13:15:33 2019 UTC
Message:: more specific mmap(2) failure checks
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 		if (close(repo->privsep_children[i].imsg_fd) != 0 &&
422 		    err == NULL)
423 			err = got_error_from_errno();
424 	}
425 	free(repo);
426 
427 	return err;
428 }
429 
430 const struct got_error *
431 got_repo_map_path(char **in_repo_path, struct got_repository *repo,
432     const char *input_path, int check_disk)
433 {
434 	const struct got_error *err = NULL;
435 	const char *repo_abspath = NULL;
436 	struct stat sb;
437 	size_t repolen, cwdlen, len;
438 	char *cwd, *canonpath, *path = NULL;
439 
440 	*in_repo_path = NULL;
441 
442 	cwd = getcwd(NULL, 0);
443 	if (cwd == NULL)
444 		return got_error_from_errno();
445 
446 	canonpath = strdup(input_path);
447 	if (canonpath == NULL) {
448 		err = got_error_from_errno();
449 		goto done;
450 	}
451 	err = got_canonpath(input_path, canonpath, strlen(canonpath) + 1);
452 	if (err)
453 		goto done;
454 
455 	repo_abspath = got_repo_get_path(repo);
456 
457 	/* TODO: Call "get in-repository path of work-tree node" API. */
458 
459 	if (!check_disk)
460 		path = strdup(canonpath);
461 	else if (lstat(canonpath, &sb) != 0) {
462 		if (errno != ENOENT) {
463 			err = got_error_from_errno();
464 			goto done;
465 		}
466 		/*
467 		 * Path is not on disk.
468 		 * Assume it is already relative to repository root.
469 		 */
470 		path = strdup(canonpath);
471 	} else {
472 		int is_repo_child = 0, is_cwd_child = 0;
473 
474 		path = realpath(canonpath, NULL);
475 		if (path == NULL) {
476 			err = got_error_from_errno();
477 			goto done;
478 		}
479 
480 		repolen = strlen(repo_abspath);
481 		cwdlen = strlen(cwd);
482 		len = strlen(path);
483 
484 		if (len > repolen && strncmp(path, repo_abspath, repolen) == 0)
485 			is_repo_child = 1;
486 		if (len > cwdlen && strncmp(path, cwd, cwdlen) == 0)
487 			is_cwd_child = 1;
488 
489 		if (strcmp(path, repo_abspath) == 0) {
490 			free(path);
491 			path = strdup("");
492 			if (path == NULL) {
493 				err = got_error_from_errno();
494 				goto done;
495 			}
496 		} else if (is_repo_child && is_cwd_child) {
497 			char *child;
498 			/* TODO: Is path inside a got worktree? */
499 			/* Strip common prefix with repository path. */
500 			err = got_path_skip_common_ancestor(&child,
501 			    repo_abspath, path);
502 			if (err)
503 				goto done;
504 			free(path);
505 			path = child;
506 		} else if (is_repo_child) {
507 			/* Matched an on-disk path inside repository. */
508 			if (got_repo_is_bare(repo)) {
509 				/*
510 				 * Matched an on-disk path inside repository
511 				 * database. Treat as repository-relative.
512 				 */
513 			} else {
514 				char *child;
515 				/* Strip common prefix with repository path. */
516 				err = got_path_skip_common_ancestor(&child,
517 				    repo_abspath, path);
518 				if (err)
519 					goto done;
520 				free(path);
521 				path = child;
522 			}
523 		} else if (is_cwd_child) {
524 			char *child;
525 			/* TODO: Is path inside a got worktree? */
526 			/* Strip common prefix with cwd. */
527 			err = got_path_skip_common_ancestor(&child, cwd,
528 			    path);
529 			if (err)
530 				goto done;
531 			free(path);
532 			path = child;
533 		} else {
534 			/*
535 			 * Matched unrelated on-disk path.
536 			 * Treat it as repository-relative.
537 			 */
538 		}
539 	}
540 
541 	/* Make in-repository path absolute */
542 	if (path[0] != '/') {
543 		char *abspath;
544 		if (asprintf(&abspath, "/%s", path) == -1) {
545 			err = got_error_from_errno();
546 			goto done;
547 		}
548 		free(path);
549 		path = abspath;
550 	}
551 
552 done:
553 	free(cwd);
554 	free(canonpath);
555 	if (err)
556 		free(path);
557 	else
558 		*in_repo_path = path;
559 	return err;
560 }
561 
562 const struct got_error *
563 got_repo_cache_packidx(struct got_repository *repo, struct got_packidx *packidx)
564 {
565 	const struct got_error *err = NULL;
566 	int i;
567 
568 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
569 		if (repo->packidx_cache[i] == NULL)
570 			break;
571 	}
572 	if (i == nitems(repo->packidx_cache)) {
573 		err = got_packidx_close(repo->packidx_cache[i - 1]);
574 		if (err)
575 			return err;
576 	}
577 
578 	/*
579 	 * Insert the new pack index at the front so it will
580 	 * be searched first in the future.
581 	 */
582 	memmove(&repo->packidx_cache[1], &repo->packidx_cache[0],
583 	    sizeof(repo->packidx_cache) -
584 	    sizeof(repo->packidx_cache[0]));
585 	repo->packidx_cache[0] = packidx;
586 
587 	return NULL;
588 }
589 
590 static int
591 is_packidx_filename(const char *name, size_t len)
592 {
593 	if (len != GOT_PACKIDX_NAMELEN)
594 		return 0;
595 
596 	if (strncmp(name, GOT_PACK_PREFIX, strlen(GOT_PACK_PREFIX)) != 0)
597 		return 0;
598 
599 	if (strcmp(name + strlen(GOT_PACK_PREFIX) +
600 	    SHA1_DIGEST_STRING_LENGTH - 1, GOT_PACKIDX_SUFFIX) != 0)
601 		return 0;
602 
603 	return 1;
604 }
605 
606 const struct got_error *
607 got_repo_search_packidx(struct got_packidx **packidx, int *idx,
608     struct got_repository *repo, struct got_object_id *id)
609 {
610 	const struct got_error *err;
611 	char *path_packdir;
612 	DIR *packdir;
613 	struct dirent *dent;
614 	char *path_packidx;
615 	int i;
616 
617 	/* Search pack index cache. */
618 	for (i = 0; i < nitems(repo->packidx_cache); i++) {
619 		if (repo->packidx_cache[i] == NULL)
620 			break;
621 		*idx = got_packidx_get_object_idx(repo->packidx_cache[i], id);
622 		if (*idx != -1) {
623 			*packidx = repo->packidx_cache[i];
624 			return NULL;
625 		}
626 	}
627 	/* No luck. Search the filesystem. */
628 
629 	path_packdir = got_repo_get_path_objects_pack(repo);
630 	if (path_packdir == NULL)
631 		return got_error_from_errno();
632 
633 	packdir = opendir(path_packdir);
634 	if (packdir == NULL) {
635 		err = got_error_from_errno();
636 		goto done;
637 	}
638 
639 	while ((dent = readdir(packdir)) != NULL) {
640 		if (!is_packidx_filename(dent->d_name, dent->d_namlen))
641 			continue;
642 
643 		if (asprintf(&path_packidx, "%s/%s", path_packdir,
644 		    dent->d_name) == -1) {
645 			err = got_error_from_errno();
646 			goto done;
647 		}
648 
649 		err = got_packidx_open(packidx, path_packidx, 0);
650 		free(path_packidx);
651 		if (err)
652 			goto done;
653 
654 		*idx = got_packidx_get_object_idx(*packidx, id);
655 		if (*idx != -1) {
656 			err = NULL; /* found the object */
657 			err = got_repo_cache_packidx(repo, *packidx);
658 			goto done;
659 		}
660 
661 		err = got_packidx_close(*packidx);
662 		*packidx = NULL;
663 		if (err)
664 			goto done;
665 	}
666 
667 	err = got_error_no_obj(id);
668 done:
669 	free(path_packdir);
670 	if (packdir && closedir(packdir) != 0 && err == 0)
671 		err = got_error_from_errno();
672 	return err;
673 }
674 
675 static const struct got_error *
676 read_packfile_hdr(int fd, struct got_packidx *packidx)
677 {
678 	const struct got_error *err = NULL;
679 	uint32_t totobj = betoh32(packidx->hdr.fanout_table[0xff]);
680 	struct got_packfile_hdr hdr;
681 	ssize_t n;
682 
683 	n = read(fd, &hdr, sizeof(hdr));
684 	if (n < 0)
685 		return got_error_from_errno();
686 	if (n != sizeof(hdr))
687 		return got_error(GOT_ERR_BAD_PACKFILE);
688 
689 	if (betoh32(hdr.signature) != GOT_PACKFILE_SIGNATURE ||
690 	    betoh32(hdr.version) != GOT_PACKFILE_VERSION ||
691 	    betoh32(hdr.nobjects) != totobj)
692 		err = got_error(GOT_ERR_BAD_PACKFILE);
693 
694 	return err;
695 }
696 
697 static const struct got_error *
698 open_packfile(int *fd, const char *path_packfile, struct got_packidx *packidx)
699 {
700 	const struct got_error *err = NULL;
701 
702 	*fd = open(path_packfile, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
703 	if (*fd == -1)
704 		return got_error_from_errno();
705 
706 	if (packidx) {
707 		err = read_packfile_hdr(*fd, packidx);
708 		if (err) {
709 			close(*fd);
710 			*fd = -1;
711 		}
712 	}
713 
714 	return err;
715 }
716 
717 const struct got_error *
718 got_repo_cache_pack(struct got_pack **packp, struct got_repository *repo,
719     const char *path_packfile, struct got_packidx *packidx)
720 {
721 	const struct got_error *err = NULL;
722 	struct got_pack *pack = NULL;
723 	int i;
724 
725 	if (packp)
726 		*packp = NULL;
727 
728 	for (i = 0; i < nitems(repo->packs); i++) {
729 		pack = &repo->packs[i];
730 		if (pack->path_packfile == NULL)
731 			break;
732 		if (strcmp(pack->path_packfile, path_packfile) == 0)
733 			return NULL;
734 	}
735 
736 	if (i == nitems(repo->packs) - 1) {
737 		err = got_pack_close(&repo->packs[i - 1]);
738 		if (err)
739 			return err;
740 		memmove(&repo->packs[1], &repo->packs[0],
741 		    sizeof(repo->packs) - sizeof(repo->packs[0]));
742 		i = 0;
743 	}
744 
745 	pack = &repo->packs[i];
746 
747 	pack->path_packfile = strdup(path_packfile);
748 	if (pack->path_packfile == NULL) {
749 		err = got_error_from_errno();
750 		goto done;
751 	}
752 
753 	err = open_packfile(&pack->fd, path_packfile, packidx);
754 	if (err)
755 		goto done;
756 
757 	err = got_pack_get_packfile_size(&pack->filesize, path_packfile);
758 	if (err)
759 		goto done;
760 
761 	pack->privsep_child = NULL;
762 
763 #ifndef GOT_PACK_NO_MMAP
764 	pack->map = mmap(NULL, pack->filesize, PROT_READ, MAP_PRIVATE,
765 	    pack->fd, 0);
766 	if (pack->map == MAP_FAILED) {
767 		if (errno != ENOMEM) {
768 			err = got_error_from_errno();
769 			goto done;
770 		}
771 		pack->map = NULL; /* fall back to read(2) */
772 	}
773 #endif
774 done:
775 	if (err) {
776 		if (pack) {
777 			free(pack->path_packfile);
778 			memset(pack, 0, sizeof(*pack));
779 		}
780 	} else if (packp)
781 		*packp = pack;
782 	return err;
783 }
784 
785 struct got_pack *
786 got_repo_get_cached_pack(struct got_repository *repo, const char *path_packfile)
787 {
788 	struct got_pack *pack = NULL;
789 	int i;
790 
791 	for (i = 0; i < nitems(repo->packs); i++) {
792 		pack = &repo->packs[i];
793 		if (pack->path_packfile == NULL)
794 			break;
795 		if (strcmp(pack->path_packfile, path_packfile) == 0)
796 			return pack;
797 	}
798 
799 	return NULL;
800 }