2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
6 * This handles basic git sha1 object files - packing, unpacking,
11 #include "string-list.h"
17 #include "run-command.h"
20 #include "tree-walk.h"
22 #include "pack-revindex.h"
23 #include "sha1-lookup.h"
24 #include "bulk-checkin.h"
25 #include "streaming.h"
29 #include "mergesort.h"
32 #define SZ_FMT PRIuMAX
33 static inline uintmax_t sz_fmt(size_t s) { return s; }
35 const unsigned char null_sha1[20];
36 const struct object_id null_oid;
37 const struct object_id empty_tree_oid = {
38 EMPTY_TREE_SHA1_BIN_LITERAL
40 const struct object_id empty_blob_oid = {
41 EMPTY_BLOB_SHA1_BIN_LITERAL
45 * This is meant to hold a *small* number of objects that you would
46 * want read_sha1_file() to be able to return, but yet you do not want
47 * to write them into the object store (e.g. a browse-only
50 static struct cached_object {
51 unsigned char sha1[20];
52 enum object_type type;
56 static int cached_object_nr, cached_object_alloc;
58 static struct cached_object empty_tree = {
59 EMPTY_TREE_SHA1_BIN_LITERAL,
65 static struct cached_object *find_cached_object(const unsigned char *sha1)
68 struct cached_object *co = cached_objects;
70 for (i = 0; i < cached_object_nr; i++, co++) {
71 if (!hashcmp(co->sha1, sha1))
74 if (!hashcmp(sha1, empty_tree.sha1))
79 int mkdir_in_gitdir(const char *path)
81 if (mkdir(path, 0777)) {
82 int saved_errno = errno;
84 struct strbuf sb = STRBUF_INIT;
89 * Are we looking at a path in a symlinked worktree
90 * whose original repository does not yet have it?
91 * e.g. .git/rr-cache pointing at its original
92 * repository in which the user hasn't performed any
93 * conflict resolution yet?
95 if (lstat(path, &st) || !S_ISLNK(st.st_mode) ||
96 strbuf_readlink(&sb, path, st.st_size) ||
97 !is_absolute_path(sb.buf) ||
98 mkdir(sb.buf, 0777)) {
105 return adjust_shared_perm(path);
108 enum scld_error safe_create_leading_directories(char *path)
110 char *next_component = path + offset_1st_component(path);
111 enum scld_error ret = SCLD_OK;
113 while (ret == SCLD_OK && next_component) {
115 char *slash = next_component, slash_character;
117 while (*slash && !is_dir_sep(*slash))
123 next_component = slash + 1;
124 while (is_dir_sep(*next_component))
126 if (!*next_component)
129 slash_character = *slash;
131 if (!stat(path, &st)) {
133 if (!S_ISDIR(st.st_mode)) {
137 } else if (mkdir(path, 0777)) {
138 if (errno == EEXIST &&
139 !stat(path, &st) && S_ISDIR(st.st_mode))
140 ; /* somebody created it since we checked */
141 else if (errno == ENOENT)
143 * Either mkdir() failed because
144 * somebody just pruned the containing
145 * directory, or stat() failed because
146 * the file that was in our way was
147 * just removed. Either way, inform
148 * the caller that it might be worth
154 } else if (adjust_shared_perm(path)) {
157 *slash = slash_character;
162 enum scld_error safe_create_leading_directories_const(const char *path)
165 /* path points to cache entries, so xstrdup before messing with it */
166 char *buf = xstrdup(path);
167 enum scld_error result = safe_create_leading_directories(buf);
175 int raceproof_create_file(const char *path, create_file_fn fn, void *cb)
178 * The number of times we will try to remove empty directories
179 * in the way of path. This is only 1 because if another
180 * process is racily creating directories that conflict with
181 * us, we don't want to fight against them.
183 int remove_directories_remaining = 1;
186 * The number of times that we will try to create the
187 * directories containing path. We are willing to attempt this
188 * more than once, because another process could be trying to
189 * clean up empty directories at the same time as we are
190 * trying to create them.
192 int create_directories_remaining = 3;
194 /* A scratch copy of path, filled lazily if we need it: */
195 struct strbuf path_copy = STRBUF_INIT;
208 if (errno == EISDIR && remove_directories_remaining-- > 0) {
210 * A directory is in the way. Maybe it is empty; try
214 strbuf_addstr(&path_copy, path);
216 if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY))
218 } else if (errno == ENOENT && create_directories_remaining-- > 0) {
220 * Maybe the containing directory didn't exist, or
221 * maybe it was just deleted by a process that is
222 * racing with us to clean up empty directories. Try
225 enum scld_error scld_result;
228 strbuf_addstr(&path_copy, path);
231 scld_result = safe_create_leading_directories(path_copy.buf);
232 if (scld_result == SCLD_OK)
234 } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0);
238 strbuf_release(&path_copy);
243 static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1)
246 for (i = 0; i < 20; i++) {
247 static char hex[] = "0123456789abcdef";
248 unsigned int val = sha1[i];
249 strbuf_addch(buf, hex[val >> 4]);
250 strbuf_addch(buf, hex[val & 0xf]);
252 strbuf_addch(buf, '/');
256 const char *sha1_file_name(const unsigned char *sha1)
258 static struct strbuf buf = STRBUF_INIT;
261 strbuf_addf(&buf, "%s/", get_object_directory());
263 fill_sha1_path(&buf, sha1);
267 struct strbuf *alt_scratch_buf(struct alternate_object_database *alt)
269 strbuf_setlen(&alt->scratch, alt->base_len);
270 return &alt->scratch;
273 static const char *alt_sha1_path(struct alternate_object_database *alt,
274 const unsigned char *sha1)
276 struct strbuf *buf = alt_scratch_buf(alt);
277 fill_sha1_path(buf, sha1);
281 char *odb_pack_name(struct strbuf *buf,
282 const unsigned char *sha1,
286 strbuf_addf(buf, "%s/pack/pack-%s.%s", get_object_directory(),
287 sha1_to_hex(sha1), ext);
291 char *sha1_pack_name(const unsigned char *sha1)
293 static struct strbuf buf = STRBUF_INIT;
294 return odb_pack_name(&buf, sha1, "pack");
297 char *sha1_pack_index_name(const unsigned char *sha1)
299 static struct strbuf buf = STRBUF_INIT;
300 return odb_pack_name(&buf, sha1, "idx");
303 struct alternate_object_database *alt_odb_list;
304 static struct alternate_object_database **alt_odb_tail;
307 * Return non-zero iff the path is usable as an alternate object database.
309 static int alt_odb_usable(struct strbuf *path, const char *normalized_objdir)
311 struct alternate_object_database *alt;
313 /* Detect cases where alternate disappeared */
314 if (!is_directory(path->buf)) {
315 error("object directory %s does not exist; "
316 "check .git/objects/info/alternates.",
322 * Prevent the common mistake of listing the same
323 * thing twice, or object directory itself.
325 for (alt = alt_odb_list; alt; alt = alt->next) {
326 if (!fspathcmp(path->buf, alt->path))
329 if (!fspathcmp(path->buf, normalized_objdir))
336 * Prepare alternate object database registry.
338 * The variable alt_odb_list points at the list of struct
339 * alternate_object_database. The elements on this list come from
340 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
341 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
342 * whose contents is similar to that environment variable but can be
343 * LF separated. Its base points at a statically allocated buffer that
344 * contains "/the/directory/corresponding/to/.git/objects/...", while
345 * its name points just after the slash at the end of ".git/objects/"
346 * in the example above, and has enough space to hold 40-byte hex
347 * SHA1, an extra slash for the first level indirection, and the
350 static void read_info_alternates(const char * relative_base, int depth);
351 static int link_alt_odb_entry(const char *entry, const char *relative_base,
352 int depth, const char *normalized_objdir)
354 struct alternate_object_database *ent;
355 struct strbuf pathbuf = STRBUF_INIT;
357 if (!is_absolute_path(entry) && relative_base) {
358 strbuf_realpath(&pathbuf, relative_base, 1);
359 strbuf_addch(&pathbuf, '/');
361 strbuf_addstr(&pathbuf, entry);
363 if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) {
364 error("unable to normalize alternate object path: %s",
366 strbuf_release(&pathbuf);
371 * The trailing slash after the directory name is given by
372 * this function at the end. Remove duplicates.
374 while (pathbuf.len && pathbuf.buf[pathbuf.len - 1] == '/')
375 strbuf_setlen(&pathbuf, pathbuf.len - 1);
377 if (!alt_odb_usable(&pathbuf, normalized_objdir)) {
378 strbuf_release(&pathbuf);
382 ent = alloc_alt_odb(pathbuf.buf);
384 /* add the alternate entry */
386 alt_odb_tail = &(ent->next);
389 /* recursively add alternates */
390 read_info_alternates(pathbuf.buf, depth + 1);
392 strbuf_release(&pathbuf);
396 static const char *parse_alt_odb_entry(const char *string,
404 if (*string == '#') {
405 /* comment; consume up to next separator */
406 end = strchrnul(string, sep);
407 } else if (*string == '"' && !unquote_c_style(out, string, &end)) {
409 * quoted path; unquote_c_style has copied the
410 * data for us and set "end". Broken quoting (e.g.,
411 * an entry that doesn't end with a quote) falls
412 * back to the unquoted case below.
415 /* normal, unquoted path */
416 end = strchrnul(string, sep);
417 strbuf_add(out, string, end - string);
425 static void link_alt_odb_entries(const char *alt, int sep,
426 const char *relative_base, int depth)
428 struct strbuf objdirbuf = STRBUF_INIT;
429 struct strbuf entry = STRBUF_INIT;
432 error("%s: ignoring alternate object stores, nesting too deep.",
437 strbuf_add_absolute_path(&objdirbuf, get_object_directory());
438 if (strbuf_normalize_path(&objdirbuf) < 0)
439 die("unable to normalize object directory: %s",
443 alt = parse_alt_odb_entry(alt, sep, &entry);
446 link_alt_odb_entry(entry.buf, relative_base, depth, objdirbuf.buf);
448 strbuf_release(&entry);
449 strbuf_release(&objdirbuf);
452 static void read_info_alternates(const char * relative_base, int depth)
455 struct strbuf buf = STRBUF_INIT;
457 path = xstrfmt("%s/info/alternates", relative_base);
458 if (strbuf_read_file(&buf, path, 1024) < 0) {
463 link_alt_odb_entries(buf.buf, '\n', relative_base, depth);
464 strbuf_release(&buf);
468 struct alternate_object_database *alloc_alt_odb(const char *dir)
470 struct alternate_object_database *ent;
472 FLEX_ALLOC_STR(ent, path, dir);
473 strbuf_init(&ent->scratch, 0);
474 strbuf_addf(&ent->scratch, "%s/", dir);
475 ent->base_len = ent->scratch.len;
480 void add_to_alternates_file(const char *reference)
482 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
483 char *alts = git_pathdup("objects/info/alternates");
486 hold_lock_file_for_update(lock, alts, LOCK_DIE_ON_ERROR);
487 out = fdopen_lock_file(lock, "w");
489 die_errno("unable to fdopen alternates lockfile");
491 in = fopen(alts, "r");
493 struct strbuf line = STRBUF_INIT;
496 while (strbuf_getline(&line, in) != EOF) {
497 if (!strcmp(reference, line.buf)) {
501 fprintf_or_die(out, "%s\n", line.buf);
504 strbuf_release(&line);
508 rollback_lock_file(lock);
512 else if (errno != ENOENT)
513 die_errno("unable to read alternates file");
516 fprintf_or_die(out, "%s\n", reference);
517 if (commit_lock_file(lock))
518 die_errno("unable to move new alternates file into place");
520 link_alt_odb_entries(reference, '\n', NULL, 0);
525 void add_to_alternates_memory(const char *reference)
528 * Make sure alternates are initialized, or else our entry may be
529 * overwritten when they are.
533 link_alt_odb_entries(reference, '\n', NULL, 0);
537 * Compute the exact path an alternate is at and returns it. In case of
538 * error NULL is returned and the human readable error is added to `err`
539 * `path` may be relative and should point to $GITDIR.
540 * `err` must not be null.
542 char *compute_alternate_path(const char *path, struct strbuf *err)
544 char *ref_git = NULL;
545 const char *repo, *ref_git_s;
548 ref_git_s = real_path_if_valid(path);
551 strbuf_addf(err, _("path '%s' does not exist"), path);
555 * Beware: read_gitfile(), real_path() and mkpath()
556 * return static buffer
558 ref_git = xstrdup(ref_git_s);
560 repo = read_gitfile(ref_git);
562 repo = read_gitfile(mkpath("%s/.git", ref_git));
565 ref_git = xstrdup(repo);
568 if (!repo && is_directory(mkpath("%s/.git/objects", ref_git))) {
569 char *ref_git_git = mkpathdup("%s/.git", ref_git);
571 ref_git = ref_git_git;
572 } else if (!is_directory(mkpath("%s/objects", ref_git))) {
573 struct strbuf sb = STRBUF_INIT;
575 if (get_common_dir(&sb, ref_git)) {
577 _("reference repository '%s' as a linked "
578 "checkout is not supported yet."),
583 strbuf_addf(err, _("reference repository '%s' is not a "
584 "local repository."), path);
588 if (!access(mkpath("%s/shallow", ref_git), F_OK)) {
589 strbuf_addf(err, _("reference repository '%s' is shallow"),
595 if (!access(mkpath("%s/info/grafts", ref_git), F_OK)) {
597 _("reference repository '%s' is grafted"),
605 FREE_AND_NULL(ref_git);
611 int foreach_alt_odb(alt_odb_fn fn, void *cb)
613 struct alternate_object_database *ent;
617 for (ent = alt_odb_list; ent; ent = ent->next) {
625 void prepare_alt_odb(void)
632 alt = getenv(ALTERNATE_DB_ENVIRONMENT);
635 alt_odb_tail = &alt_odb_list;
636 link_alt_odb_entries(alt, PATH_SEP, NULL, 0);
638 read_info_alternates(get_object_directory(), 0);
641 /* Returns 1 if we have successfully freshened the file, 0 otherwise. */
642 static int freshen_file(const char *fn)
645 t.actime = t.modtime = time(NULL);
646 return !utime(fn, &t);
650 * All of the check_and_freshen functions return 1 if the file exists and was
651 * freshened (if freshening was requested), 0 otherwise. If they return
652 * 0, you should not assume that it is safe to skip a write of the object (it
653 * either does not exist on disk, or has a stale mtime and may be subject to
656 int check_and_freshen_file(const char *fn, int freshen)
658 if (access(fn, F_OK))
660 if (freshen && !freshen_file(fn))
665 static int check_and_freshen_local(const unsigned char *sha1, int freshen)
667 return check_and_freshen_file(sha1_file_name(sha1), freshen);
670 static int check_and_freshen_nonlocal(const unsigned char *sha1, int freshen)
672 struct alternate_object_database *alt;
674 for (alt = alt_odb_list; alt; alt = alt->next) {
675 const char *path = alt_sha1_path(alt, sha1);
676 if (check_and_freshen_file(path, freshen))
682 static int check_and_freshen(const unsigned char *sha1, int freshen)
684 return check_and_freshen_local(sha1, freshen) ||
685 check_and_freshen_nonlocal(sha1, freshen);
688 int has_loose_object_nonlocal(const unsigned char *sha1)
690 return check_and_freshen_nonlocal(sha1, 0);
693 static int has_loose_object(const unsigned char *sha1)
695 return check_and_freshen(sha1, 0);
698 static unsigned int pack_used_ctr;
699 static unsigned int pack_mmap_calls;
700 static unsigned int peak_pack_open_windows;
701 static unsigned int pack_open_windows;
702 static unsigned int pack_open_fds;
703 static unsigned int pack_max_fds;
704 static size_t peak_pack_mapped;
705 static size_t pack_mapped;
706 struct packed_git *packed_git;
708 static struct mru packed_git_mru_storage;
709 struct mru *packed_git_mru = &packed_git_mru_storage;
711 void pack_report(void)
714 "pack_report: getpagesize() = %10" SZ_FMT "\n"
715 "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
716 "pack_report: core.packedGitLimit = %10" SZ_FMT "\n",
717 sz_fmt(getpagesize()),
718 sz_fmt(packed_git_window_size),
719 sz_fmt(packed_git_limit));
721 "pack_report: pack_used_ctr = %10u\n"
722 "pack_report: pack_mmap_calls = %10u\n"
723 "pack_report: pack_open_windows = %10u / %10u\n"
724 "pack_report: pack_mapped = "
725 "%10" SZ_FMT " / %10" SZ_FMT "\n",
728 pack_open_windows, peak_pack_open_windows,
729 sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped));
733 * Open and mmap the index file at path, perform a couple of
734 * consistency checks, then record its information to p. Return 0 on
737 static int check_packed_git_idx(const char *path, struct packed_git *p)
740 struct pack_idx_header *hdr;
742 uint32_t version, nr, i, *index;
743 int fd = git_open(path);
748 if (fstat(fd, &st)) {
752 idx_size = xsize_t(st.st_size);
753 if (idx_size < 4 * 256 + 20 + 20) {
755 return error("index file %s is too small", path);
757 idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
761 if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) {
762 version = ntohl(hdr->idx_version);
763 if (version < 2 || version > 2) {
764 munmap(idx_map, idx_size);
765 return error("index file %s is version %"PRIu32
766 " and is not supported by this binary"
767 " (try upgrading GIT to a newer version)",
776 index += 2; /* skip index header */
777 for (i = 0; i < 256; i++) {
778 uint32_t n = ntohl(index[i]);
780 munmap(idx_map, idx_size);
781 return error("non-monotonic index %s", path);
789 * - 256 index entries 4 bytes each
790 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
791 * - 20-byte SHA1 of the packfile
792 * - 20-byte SHA1 file checksum
794 if (idx_size != 4*256 + nr * 24 + 20 + 20) {
795 munmap(idx_map, idx_size);
796 return error("wrong index v1 file size in %s", path);
798 } else if (version == 2) {
801 * - 8 bytes of header
802 * - 256 index entries 4 bytes each
803 * - 20-byte sha1 entry * nr
804 * - 4-byte crc entry * nr
805 * - 4-byte offset entry * nr
806 * - 20-byte SHA1 of the packfile
807 * - 20-byte SHA1 file checksum
808 * And after the 4-byte offset table might be a
809 * variable sized table containing 8-byte entries
810 * for offsets larger than 2^31.
812 unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20;
813 unsigned long max_size = min_size;
815 max_size += (nr - 1)*8;
816 if (idx_size < min_size || idx_size > max_size) {
817 munmap(idx_map, idx_size);
818 return error("wrong index v2 file size in %s", path);
820 if (idx_size != min_size &&
822 * make sure we can deal with large pack offsets.
823 * 31-bit signed offset won't be enough, neither
824 * 32-bit unsigned one will be.
826 (sizeof(off_t) <= 4)) {
827 munmap(idx_map, idx_size);
828 return error("pack too large for current definition of off_t in %s", path);
832 p->index_version = version;
833 p->index_data = idx_map;
834 p->index_size = idx_size;
839 int open_pack_index(struct packed_git *p)
848 if (!strip_suffix(p->pack_name, ".pack", &len))
849 die("BUG: pack_name does not end in .pack");
850 idx_name = xstrfmt("%.*s.idx", (int)len, p->pack_name);
851 ret = check_packed_git_idx(idx_name, p);
856 static void scan_windows(struct packed_git *p,
857 struct packed_git **lru_p,
858 struct pack_window **lru_w,
859 struct pack_window **lru_l)
861 struct pack_window *w, *w_l;
863 for (w_l = NULL, w = p->windows; w; w = w->next) {
865 if (!*lru_w || w->last_used < (*lru_w)->last_used) {
875 static int unuse_one_window(struct packed_git *current)
877 struct packed_git *p, *lru_p = NULL;
878 struct pack_window *lru_w = NULL, *lru_l = NULL;
881 scan_windows(current, &lru_p, &lru_w, &lru_l);
882 for (p = packed_git; p; p = p->next)
883 scan_windows(p, &lru_p, &lru_w, &lru_l);
885 munmap(lru_w->base, lru_w->len);
886 pack_mapped -= lru_w->len;
888 lru_l->next = lru_w->next;
890 lru_p->windows = lru_w->next;
898 void release_pack_memory(size_t need)
900 size_t cur = pack_mapped;
901 while (need >= (cur - pack_mapped) && unuse_one_window(NULL))
905 static void mmap_limit_check(size_t length)
907 static size_t limit = 0;
909 limit = git_env_ulong("GIT_MMAP_LIMIT", 0);
914 die("attempting to mmap %"PRIuMAX" over limit %"PRIuMAX,
915 (uintmax_t)length, (uintmax_t)limit);
918 void *xmmap_gently(void *start, size_t length,
919 int prot, int flags, int fd, off_t offset)
923 mmap_limit_check(length);
924 ret = mmap(start, length, prot, flags, fd, offset);
925 if (ret == MAP_FAILED) {
928 release_pack_memory(length);
929 ret = mmap(start, length, prot, flags, fd, offset);
934 void *xmmap(void *start, size_t length,
935 int prot, int flags, int fd, off_t offset)
937 void *ret = xmmap_gently(start, length, prot, flags, fd, offset);
938 if (ret == MAP_FAILED)
939 die_errno("mmap failed");
943 void close_pack_windows(struct packed_git *p)
946 struct pack_window *w = p->windows;
949 die("pack '%s' still has open windows to it",
951 munmap(w->base, w->len);
952 pack_mapped -= w->len;
954 p->windows = w->next;
959 static int close_pack_fd(struct packed_git *p)
971 static void close_pack(struct packed_git *p)
973 close_pack_windows(p);
978 void close_all_packs(void)
980 struct packed_git *p;
982 for (p = packed_git; p; p = p->next)
984 die("BUG: want to close pack marked 'do-not-close'");
991 * The LRU pack is the one with the oldest MRU window, preferring packs
992 * with no used windows, or the oldest mtime if it has no windows allocated.
994 static void find_lru_pack(struct packed_git *p, struct packed_git **lru_p, struct pack_window **mru_w, int *accept_windows_inuse)
996 struct pack_window *w, *this_mru_w;
997 int has_windows_inuse = 0;
1000 * Reject this pack if it has windows and the previously selected
1001 * one does not. If this pack does not have windows, reject
1002 * it if the pack file is newer than the previously selected one.
1004 if (*lru_p && !*mru_w && (p->windows || p->mtime > (*lru_p)->mtime))
1007 for (w = this_mru_w = p->windows; w; w = w->next) {
1009 * Reject this pack if any of its windows are in use,
1010 * but the previously selected pack did not have any
1011 * inuse windows. Otherwise, record that this pack
1012 * has windows in use.
1015 if (*accept_windows_inuse)
1016 has_windows_inuse = 1;
1021 if (w->last_used > this_mru_w->last_used)
1025 * Reject this pack if it has windows that have been
1026 * used more recently than the previously selected pack.
1027 * If the previously selected pack had windows inuse and
1028 * we have not encountered a window in this pack that is
1029 * inuse, skip this check since we prefer a pack with no
1030 * inuse windows to one that has inuse windows.
1032 if (*mru_w && *accept_windows_inuse == has_windows_inuse &&
1033 this_mru_w->last_used > (*mru_w)->last_used)
1040 *mru_w = this_mru_w;
1042 *accept_windows_inuse = has_windows_inuse;
1045 static int close_one_pack(void)
1047 struct packed_git *p, *lru_p = NULL;
1048 struct pack_window *mru_w = NULL;
1049 int accept_windows_inuse = 1;
1051 for (p = packed_git; p; p = p->next) {
1052 if (p->pack_fd == -1)
1054 find_lru_pack(p, &lru_p, &mru_w, &accept_windows_inuse);
1058 return close_pack_fd(lru_p);
1063 void unuse_pack(struct pack_window **w_cursor)
1065 struct pack_window *w = *w_cursor;
1072 void close_pack_index(struct packed_git *p)
1074 if (p->index_data) {
1075 munmap((void *)p->index_data, p->index_size);
1076 p->index_data = NULL;
1080 static unsigned int get_max_fd_limit(void)
1082 #ifdef RLIMIT_NOFILE
1086 if (!getrlimit(RLIMIT_NOFILE, &lim))
1087 return lim.rlim_cur;
1093 long open_max = sysconf(_SC_OPEN_MAX);
1097 * Otherwise, we got -1 for one of the two
1100 * (1) sysconf() did not understand _SC_OPEN_MAX
1101 * and signaled an error with -1; or
1102 * (2) sysconf() said there is no limit.
1104 * We _could_ clear errno before calling sysconf() to
1105 * tell these two cases apart and return a huge number
1106 * in the latter case to let the caller cap it to a
1107 * value that is not so selfish, but letting the
1108 * fallback OPEN_MAX codepath take care of these cases
1117 return 1; /* see the caller ;-) */
1122 * Do not call this directly as this leaks p->pack_fd on error return;
1123 * call open_packed_git() instead.
1125 static int open_packed_git_1(struct packed_git *p)
1128 struct pack_header hdr;
1129 unsigned char sha1[20];
1130 unsigned char *idx_sha1;
1133 if (!p->index_data && open_pack_index(p))
1134 return error("packfile %s index unavailable", p->pack_name);
1136 if (!pack_max_fds) {
1137 unsigned int max_fds = get_max_fd_limit();
1139 /* Save 3 for stdin/stdout/stderr, 22 for work */
1141 pack_max_fds = max_fds - 25;
1146 while (pack_max_fds <= pack_open_fds && close_one_pack())
1149 p->pack_fd = git_open(p->pack_name);
1150 if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
1154 /* If we created the struct before we had the pack we lack size. */
1155 if (!p->pack_size) {
1156 if (!S_ISREG(st.st_mode))
1157 return error("packfile %s not a regular file", p->pack_name);
1158 p->pack_size = st.st_size;
1159 } else if (p->pack_size != st.st_size)
1160 return error("packfile %s size changed", p->pack_name);
1162 /* We leave these file descriptors open with sliding mmap;
1163 * there is no point keeping them open across exec(), though.
1165 fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
1167 return error("cannot determine file descriptor flags");
1168 fd_flag |= FD_CLOEXEC;
1169 if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
1170 return error("cannot set FD_CLOEXEC");
1172 /* Verify we recognize this pack file format. */
1173 if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
1174 return error("file %s is far too short to be a packfile", p->pack_name);
1175 if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
1176 return error("file %s is not a GIT packfile", p->pack_name);
1177 if (!pack_version_ok(hdr.hdr_version))
1178 return error("packfile %s is version %"PRIu32" and not"
1179 " supported (try upgrading GIT to a newer version)",
1180 p->pack_name, ntohl(hdr.hdr_version));
1182 /* Verify the pack matches its index. */
1183 if (p->num_objects != ntohl(hdr.hdr_entries))
1184 return error("packfile %s claims to have %"PRIu32" objects"
1185 " while index indicates %"PRIu32" objects",
1186 p->pack_name, ntohl(hdr.hdr_entries),
1188 if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
1189 return error("end of packfile %s is unavailable", p->pack_name);
1190 if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1))
1191 return error("packfile %s signature is unavailable", p->pack_name);
1192 idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40;
1193 if (hashcmp(sha1, idx_sha1))
1194 return error("packfile %s does not match index", p->pack_name);
1198 static int open_packed_git(struct packed_git *p)
1200 if (!open_packed_git_1(p))
1206 static int in_window(struct pack_window *win, off_t offset)
1208 /* We must promise at least 20 bytes (one hash) after the
1209 * offset is available from this window, otherwise the offset
1210 * is not actually in this window and a different window (which
1211 * has that one hash excess) must be used. This is to support
1212 * the object header and delta base parsing routines below.
1214 off_t win_off = win->offset;
1215 return win_off <= offset
1216 && (offset + 20) <= (win_off + win->len);
1219 unsigned char *use_pack(struct packed_git *p,
1220 struct pack_window **w_cursor,
1222 unsigned long *left)
1224 struct pack_window *win = *w_cursor;
1226 /* Since packfiles end in a hash of their content and it's
1227 * pointless to ask for an offset into the middle of that
1228 * hash, and the in_window function above wouldn't match
1229 * don't allow an offset too close to the end of the file.
1231 if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p))
1232 die("packfile %s cannot be accessed", p->pack_name);
1233 if (offset > (p->pack_size - 20))
1234 die("offset beyond end of packfile (truncated pack?)");
1236 die(_("offset before end of packfile (broken .idx?)"));
1238 if (!win || !in_window(win, offset)) {
1241 for (win = p->windows; win; win = win->next) {
1242 if (in_window(win, offset))
1246 size_t window_align = packed_git_window_size / 2;
1249 if (p->pack_fd == -1 && open_packed_git(p))
1250 die("packfile %s cannot be accessed", p->pack_name);
1252 win = xcalloc(1, sizeof(*win));
1253 win->offset = (offset / window_align) * window_align;
1254 len = p->pack_size - win->offset;
1255 if (len > packed_git_window_size)
1256 len = packed_git_window_size;
1257 win->len = (size_t)len;
1258 pack_mapped += win->len;
1259 while (packed_git_limit < pack_mapped
1260 && unuse_one_window(p))
1262 win->base = xmmap(NULL, win->len,
1263 PROT_READ, MAP_PRIVATE,
1264 p->pack_fd, win->offset);
1265 if (win->base == MAP_FAILED)
1266 die_errno("packfile %s cannot be mapped",
1268 if (!win->offset && win->len == p->pack_size
1269 && !p->do_not_close)
1272 pack_open_windows++;
1273 if (pack_mapped > peak_pack_mapped)
1274 peak_pack_mapped = pack_mapped;
1275 if (pack_open_windows > peak_pack_open_windows)
1276 peak_pack_open_windows = pack_open_windows;
1277 win->next = p->windows;
1281 if (win != *w_cursor) {
1282 win->last_used = pack_used_ctr++;
1286 offset -= win->offset;
1288 *left = win->len - xsize_t(offset);
1289 return win->base + offset;
1292 static struct packed_git *alloc_packed_git(int extra)
1294 struct packed_git *p = xmalloc(st_add(sizeof(*p), extra));
1295 memset(p, 0, sizeof(*p));
1300 static void try_to_free_pack_memory(size_t size)
1302 release_pack_memory(size);
1305 struct packed_git *add_packed_git(const char *path, size_t path_len, int local)
1307 static int have_set_try_to_free_routine;
1310 struct packed_git *p;
1312 if (!have_set_try_to_free_routine) {
1313 have_set_try_to_free_routine = 1;
1314 set_try_to_free_routine(try_to_free_pack_memory);
1318 * Make sure a corresponding .pack file exists and that
1319 * the index looks sane.
1321 if (!strip_suffix_mem(path, &path_len, ".idx"))
1325 * ".pack" is long enough to hold any suffix we're adding (and
1326 * the use xsnprintf double-checks that)
1328 alloc = st_add3(path_len, strlen(".pack"), 1);
1329 p = alloc_packed_git(alloc);
1330 memcpy(p->pack_name, path, path_len);
1332 xsnprintf(p->pack_name + path_len, alloc - path_len, ".keep");
1333 if (!access(p->pack_name, F_OK))
1336 xsnprintf(p->pack_name + path_len, alloc - path_len, ".pack");
1337 if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) {
1342 /* ok, it looks sane as far as we can check without
1343 * actually mapping the pack file.
1345 p->pack_size = st.st_size;
1346 p->pack_local = local;
1347 p->mtime = st.st_mtime;
1348 if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1))
1353 struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path)
1355 const char *path = sha1_pack_name(sha1);
1356 size_t alloc = st_add(strlen(path), 1);
1357 struct packed_git *p = alloc_packed_git(alloc);
1359 memcpy(p->pack_name, path, alloc); /* includes NUL */
1360 hashcpy(p->sha1, sha1);
1361 if (check_packed_git_idx(idx_path, p)) {
1369 void install_packed_git(struct packed_git *pack)
1371 if (pack->pack_fd != -1)
1374 pack->next = packed_git;
1378 void (*report_garbage)(unsigned seen_bits, const char *path);
1380 static void report_helper(const struct string_list *list,
1381 int seen_bits, int first, int last)
1383 if (seen_bits == (PACKDIR_FILE_PACK|PACKDIR_FILE_IDX))
1386 for (; first < last; first++)
1387 report_garbage(seen_bits, list->items[first].string);
1390 static void report_pack_garbage(struct string_list *list)
1392 int i, baselen = -1, first = 0, seen_bits = 0;
1394 if (!report_garbage)
1397 string_list_sort(list);
1399 for (i = 0; i < list->nr; i++) {
1400 const char *path = list->items[i].string;
1401 if (baselen != -1 &&
1402 strncmp(path, list->items[first].string, baselen)) {
1403 report_helper(list, seen_bits, first, i);
1407 if (baselen == -1) {
1408 const char *dot = strrchr(path, '.');
1410 report_garbage(PACKDIR_FILE_GARBAGE, path);
1413 baselen = dot - path + 1;
1416 if (!strcmp(path + baselen, "pack"))
1418 else if (!strcmp(path + baselen, "idx"))
1421 report_helper(list, seen_bits, first, list->nr);
1424 static void prepare_packed_git_one(char *objdir, int local)
1426 struct strbuf path = STRBUF_INIT;
1430 struct string_list garbage = STRING_LIST_INIT_DUP;
1432 strbuf_addstr(&path, objdir);
1433 strbuf_addstr(&path, "/pack");
1434 dir = opendir(path.buf);
1436 if (errno != ENOENT)
1437 error_errno("unable to open object pack directory: %s",
1439 strbuf_release(&path);
1442 strbuf_addch(&path, '/');
1443 dirnamelen = path.len;
1444 while ((de = readdir(dir)) != NULL) {
1445 struct packed_git *p;
1448 if (is_dot_or_dotdot(de->d_name))
1451 strbuf_setlen(&path, dirnamelen);
1452 strbuf_addstr(&path, de->d_name);
1454 base_len = path.len;
1455 if (strip_suffix_mem(path.buf, &base_len, ".idx")) {
1456 /* Don't reopen a pack we already have. */
1457 for (p = packed_git; p; p = p->next) {
1459 if (strip_suffix(p->pack_name, ".pack", &len) &&
1461 !memcmp(p->pack_name, path.buf, len))
1466 * See if it really is a valid .idx file with
1467 * corresponding .pack file that we can map.
1469 (p = add_packed_git(path.buf, path.len, local)) != NULL)
1470 install_packed_git(p);
1473 if (!report_garbage)
1476 if (ends_with(de->d_name, ".idx") ||
1477 ends_with(de->d_name, ".pack") ||
1478 ends_with(de->d_name, ".bitmap") ||
1479 ends_with(de->d_name, ".keep"))
1480 string_list_append(&garbage, path.buf);
1482 report_garbage(PACKDIR_FILE_GARBAGE, path.buf);
1485 report_pack_garbage(&garbage);
1486 string_list_clear(&garbage, 0);
1487 strbuf_release(&path);
1490 static int approximate_object_count_valid;
1493 * Give a fast, rough count of the number of objects in the repository. This
1494 * ignores loose objects completely. If you have a lot of them, then either
1495 * you should repack because your performance will be awful, or they are
1496 * all unreachable objects about to be pruned, in which case they're not really
1497 * interesting as a measure of repo size in the first place.
1499 unsigned long approximate_object_count(void)
1501 static unsigned long count;
1502 if (!approximate_object_count_valid) {
1503 struct packed_git *p;
1505 prepare_packed_git();
1507 for (p = packed_git; p; p = p->next) {
1508 if (open_pack_index(p))
1510 count += p->num_objects;
1516 static void *get_next_packed_git(const void *p)
1518 return ((const struct packed_git *)p)->next;
1521 static void set_next_packed_git(void *p, void *next)
1523 ((struct packed_git *)p)->next = next;
1526 static int sort_pack(const void *a_, const void *b_)
1528 const struct packed_git *a = a_;
1529 const struct packed_git *b = b_;
1533 * Local packs tend to contain objects specific to our
1534 * variant of the project than remote ones. In addition,
1535 * remote ones could be on a network mounted filesystem.
1536 * Favor local ones for these reasons.
1538 st = a->pack_local - b->pack_local;
1543 * Younger packs tend to contain more recent objects,
1544 * and more recent objects tend to get accessed more
1547 if (a->mtime < b->mtime)
1549 else if (a->mtime == b->mtime)
1554 static void rearrange_packed_git(void)
1556 packed_git = llist_mergesort(packed_git, get_next_packed_git,
1557 set_next_packed_git, sort_pack);
1560 static void prepare_packed_git_mru(void)
1562 struct packed_git *p;
1564 mru_clear(packed_git_mru);
1565 for (p = packed_git; p; p = p->next)
1566 mru_append(packed_git_mru, p);
1569 static int prepare_packed_git_run_once = 0;
1570 void prepare_packed_git(void)
1572 struct alternate_object_database *alt;
1574 if (prepare_packed_git_run_once)
1576 prepare_packed_git_one(get_object_directory(), 1);
1578 for (alt = alt_odb_list; alt; alt = alt->next)
1579 prepare_packed_git_one(alt->path, 0);
1580 rearrange_packed_git();
1581 prepare_packed_git_mru();
1582 prepare_packed_git_run_once = 1;
1585 void reprepare_packed_git(void)
1587 approximate_object_count_valid = 0;
1588 prepare_packed_git_run_once = 0;
1589 prepare_packed_git();
1592 static void mark_bad_packed_object(struct packed_git *p,
1593 const unsigned char *sha1)
1596 for (i = 0; i < p->num_bad_objects; i++)
1597 if (!hashcmp(sha1, p->bad_object_sha1 + GIT_SHA1_RAWSZ * i))
1599 p->bad_object_sha1 = xrealloc(p->bad_object_sha1,
1600 st_mult(GIT_MAX_RAWSZ,
1601 st_add(p->num_bad_objects, 1)));
1602 hashcpy(p->bad_object_sha1 + GIT_SHA1_RAWSZ * p->num_bad_objects, sha1);
1603 p->num_bad_objects++;
1606 static const struct packed_git *has_packed_and_bad(const unsigned char *sha1)
1608 struct packed_git *p;
1611 for (p = packed_git; p; p = p->next)
1612 for (i = 0; i < p->num_bad_objects; i++)
1613 if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i))
1619 * With an in-core object data in "map", rehash it to make sure the
1620 * object name actually matches "sha1" to detect object corruption.
1621 * With "map" == NULL, try reading the object named with "sha1" using
1622 * the streaming interface and rehash it to do the same.
1624 int check_sha1_signature(const unsigned char *sha1, void *map,
1625 unsigned long size, const char *type)
1627 unsigned char real_sha1[20];
1628 enum object_type obj_type;
1629 struct git_istream *st;
1635 hash_sha1_file(map, size, type, real_sha1);
1636 return hashcmp(sha1, real_sha1) ? -1 : 0;
1639 st = open_istream(sha1, &obj_type, &size, NULL);
1643 /* Generate the header */
1644 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(obj_type), size) + 1;
1648 git_SHA1_Update(&c, hdr, hdrlen);
1650 char buf[1024 * 16];
1651 ssize_t readlen = read_istream(st, buf, sizeof(buf));
1659 git_SHA1_Update(&c, buf, readlen);
1661 git_SHA1_Final(real_sha1, &c);
1663 return hashcmp(sha1, real_sha1) ? -1 : 0;
1666 int git_open_cloexec(const char *name, int flags)
1669 static int o_cloexec = O_CLOEXEC;
1671 fd = open(name, flags | o_cloexec);
1672 if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) {
1673 /* Try again w/o O_CLOEXEC: the kernel might not support it */
1674 o_cloexec &= ~O_CLOEXEC;
1675 fd = open(name, flags | o_cloexec);
1678 #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
1680 static int fd_cloexec = FD_CLOEXEC;
1682 if (!o_cloexec && 0 <= fd && fd_cloexec) {
1683 /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
1684 int flags = fcntl(fd, F_GETFD);
1685 if (fcntl(fd, F_SETFD, flags | fd_cloexec))
1694 * Find "sha1" as a loose object in the local repository or in an alternate.
1695 * Returns 0 on success, negative on failure.
1697 * The "path" out-parameter will give the path of the object we found (if any).
1698 * Note that it may point to static storage and is only valid until another
1699 * call to sha1_file_name(), etc.
1701 static int stat_sha1_file(const unsigned char *sha1, struct stat *st,
1704 struct alternate_object_database *alt;
1706 *path = sha1_file_name(sha1);
1707 if (!lstat(*path, st))
1712 for (alt = alt_odb_list; alt; alt = alt->next) {
1713 *path = alt_sha1_path(alt, sha1);
1714 if (!lstat(*path, st))
1722 * Like stat_sha1_file(), but actually open the object and return the
1723 * descriptor. See the caveats on the "path" parameter above.
1725 static int open_sha1_file(const unsigned char *sha1, const char **path)
1728 struct alternate_object_database *alt;
1729 int most_interesting_errno;
1731 *path = sha1_file_name(sha1);
1732 fd = git_open(*path);
1735 most_interesting_errno = errno;
1738 for (alt = alt_odb_list; alt; alt = alt->next) {
1739 *path = alt_sha1_path(alt, sha1);
1740 fd = git_open(*path);
1743 if (most_interesting_errno == ENOENT)
1744 most_interesting_errno = errno;
1746 errno = most_interesting_errno;
1751 * Map the loose object at "path" if it is not NULL, or the path found by
1752 * searching for a loose object named "sha1".
1754 static void *map_sha1_file_1(const char *path,
1755 const unsigned char *sha1,
1756 unsigned long *size)
1762 fd = git_open(path);
1764 fd = open_sha1_file(sha1, &path);
1769 if (!fstat(fd, &st)) {
1770 *size = xsize_t(st.st_size);
1772 /* mmap() is forbidden on empty files */
1773 error("object file %s is empty", path);
1776 map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
1783 void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
1785 return map_sha1_file_1(NULL, sha1, size);
1788 unsigned long unpack_object_header_buffer(const unsigned char *buf,
1789 unsigned long len, enum object_type *type, unsigned long *sizep)
1792 unsigned long size, c;
1793 unsigned long used = 0;
1796 *type = (c >> 4) & 7;
1800 if (len <= used || bitsizeof(long) <= shift) {
1801 error("bad object header");
1806 size += (c & 0x7f) << shift;
1813 static int unpack_sha1_short_header(git_zstream *stream,
1814 unsigned char *map, unsigned long mapsize,
1815 void *buffer, unsigned long bufsiz)
1817 /* Get the data stream */
1818 memset(stream, 0, sizeof(*stream));
1819 stream->next_in = map;
1820 stream->avail_in = mapsize;
1821 stream->next_out = buffer;
1822 stream->avail_out = bufsiz;
1824 git_inflate_init(stream);
1825 return git_inflate(stream, 0);
1828 int unpack_sha1_header(git_zstream *stream,
1829 unsigned char *map, unsigned long mapsize,
1830 void *buffer, unsigned long bufsiz)
1832 int status = unpack_sha1_short_header(stream, map, mapsize,
1838 /* Make sure we have the terminating NUL */
1839 if (!memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1844 static int unpack_sha1_header_to_strbuf(git_zstream *stream, unsigned char *map,
1845 unsigned long mapsize, void *buffer,
1846 unsigned long bufsiz, struct strbuf *header)
1850 status = unpack_sha1_short_header(stream, map, mapsize, buffer, bufsiz);
1855 * Check if entire header is unpacked in the first iteration.
1857 if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1861 * buffer[0..bufsiz] was not large enough. Copy the partial
1862 * result out to header, and then append the result of further
1863 * reading the stream.
1865 strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
1866 stream->next_out = buffer;
1867 stream->avail_out = bufsiz;
1870 status = git_inflate(stream, 0);
1871 strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
1872 if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
1874 stream->next_out = buffer;
1875 stream->avail_out = bufsiz;
1876 } while (status != Z_STREAM_END);
1880 static void *unpack_sha1_rest(git_zstream *stream, void *buffer, unsigned long size, const unsigned char *sha1)
1882 int bytes = strlen(buffer) + 1;
1883 unsigned char *buf = xmallocz(size);
1887 n = stream->total_out - bytes;
1890 memcpy(buf, (char *) buffer + bytes, n);
1892 if (bytes <= size) {
1894 * The above condition must be (bytes <= size), not
1895 * (bytes < size). In other words, even though we
1896 * expect no more output and set avail_out to zero,
1897 * the input zlib stream may have bytes that express
1898 * "this concludes the stream", and we *do* want to
1901 * Otherwise we would not be able to test that we
1902 * consumed all the input to reach the expected size;
1903 * we also want to check that zlib tells us that all
1904 * went well with status == Z_STREAM_END at the end.
1906 stream->next_out = buf + bytes;
1907 stream->avail_out = size - bytes;
1908 while (status == Z_OK)
1909 status = git_inflate(stream, Z_FINISH);
1911 if (status == Z_STREAM_END && !stream->avail_in) {
1912 git_inflate_end(stream);
1917 error("corrupt loose object '%s'", sha1_to_hex(sha1));
1918 else if (stream->avail_in)
1919 error("garbage at end of loose object '%s'",
1926 * We used to just use "sscanf()", but that's actually way
1927 * too permissive for what we want to check. So do an anal
1928 * object header parse by hand.
1930 static int parse_sha1_header_extended(const char *hdr, struct object_info *oi,
1933 const char *type_buf = hdr;
1935 int type, type_len = 0;
1938 * The type can be of any size but is followed by
1950 type = type_from_string_gently(type_buf, type_len, 1);
1952 strbuf_add(oi->typename, type_buf, type_len);
1954 * Set type to 0 if its an unknown object and
1955 * we're obtaining the type using '--allow-unknown-type'
1958 if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0))
1961 die("invalid object type");
1966 * The length must follow immediately, and be in canonical
1967 * decimal format (ie "010" is not valid).
1969 size = *hdr++ - '0';
1974 unsigned long c = *hdr - '0';
1978 size = size * 10 + c;
1986 * The length must be followed by a zero byte
1988 return *hdr ? -1 : type;
1991 int parse_sha1_header(const char *hdr, unsigned long *sizep)
1993 struct object_info oi = OBJECT_INFO_INIT;
1996 return parse_sha1_header_extended(hdr, &oi, 0);
1999 unsigned long get_size_from_delta(struct packed_git *p,
2000 struct pack_window **w_curs,
2003 const unsigned char *data;
2004 unsigned char delta_head[20], *in;
2008 memset(&stream, 0, sizeof(stream));
2009 stream.next_out = delta_head;
2010 stream.avail_out = sizeof(delta_head);
2012 git_inflate_init(&stream);
2014 in = use_pack(p, w_curs, curpos, &stream.avail_in);
2015 stream.next_in = in;
2016 st = git_inflate(&stream, Z_FINISH);
2017 curpos += stream.next_in - in;
2018 } while ((st == Z_OK || st == Z_BUF_ERROR) &&
2019 stream.total_out < sizeof(delta_head));
2020 git_inflate_end(&stream);
2021 if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) {
2022 error("delta data unpack-initial failed");
2026 /* Examine the initial part of the delta to figure out
2031 /* ignore base size */
2032 get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
2034 /* Read the result size */
2035 return get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
2038 static off_t get_delta_base(struct packed_git *p,
2039 struct pack_window **w_curs,
2041 enum object_type type,
2042 off_t delta_obj_offset)
2044 unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL);
2047 /* use_pack() assured us we have [base_info, base_info + 20)
2048 * as a range that we can look at without walking off the
2049 * end of the mapped window. Its actually the hash size
2050 * that is assured. An OFS_DELTA longer than the hash size
2051 * is stupid, as then a REF_DELTA would be smaller to store.
2053 if (type == OBJ_OFS_DELTA) {
2055 unsigned char c = base_info[used++];
2056 base_offset = c & 127;
2059 if (!base_offset || MSB(base_offset, 7))
2060 return 0; /* overflow */
2061 c = base_info[used++];
2062 base_offset = (base_offset << 7) + (c & 127);
2064 base_offset = delta_obj_offset - base_offset;
2065 if (base_offset <= 0 || base_offset >= delta_obj_offset)
2066 return 0; /* out of bound */
2068 } else if (type == OBJ_REF_DELTA) {
2069 /* The base entry _must_ be in the same pack */
2070 base_offset = find_pack_entry_one(base_info, p);
2073 die("I am totally screwed");
2078 * Like get_delta_base above, but we return the sha1 instead of the pack
2079 * offset. This means it is cheaper for REF deltas (we do not have to do
2080 * the final object lookup), but more expensive for OFS deltas (we
2081 * have to load the revidx to convert the offset back into a sha1).
2083 static const unsigned char *get_delta_base_sha1(struct packed_git *p,
2084 struct pack_window **w_curs,
2086 enum object_type type,
2087 off_t delta_obj_offset)
2089 if (type == OBJ_REF_DELTA) {
2090 unsigned char *base = use_pack(p, w_curs, curpos, NULL);
2092 } else if (type == OBJ_OFS_DELTA) {
2093 struct revindex_entry *revidx;
2094 off_t base_offset = get_delta_base(p, w_curs, &curpos,
2095 type, delta_obj_offset);
2100 revidx = find_pack_revindex(p, base_offset);
2104 return nth_packed_object_sha1(p, revidx->nr);
2109 int unpack_object_header(struct packed_git *p,
2110 struct pack_window **w_curs,
2112 unsigned long *sizep)
2114 unsigned char *base;
2117 enum object_type type;
2119 /* use_pack() assures us we have [base, base + 20) available
2120 * as a range that we can look at. (Its actually the hash
2121 * size that is assured.) With our object header encoding
2122 * the maximum deflated object size is 2^137, which is just
2123 * insane, so we know won't exceed what we have been given.
2125 base = use_pack(p, w_curs, *curpos, &left);
2126 used = unpack_object_header_buffer(base, left, &type, sizep);
2135 static int retry_bad_packed_offset(struct packed_git *p, off_t obj_offset)
2138 struct revindex_entry *revidx;
2139 const unsigned char *sha1;
2140 revidx = find_pack_revindex(p, obj_offset);
2143 sha1 = nth_packed_object_sha1(p, revidx->nr);
2144 mark_bad_packed_object(p, sha1);
2145 type = sha1_object_info(sha1, NULL);
2146 if (type <= OBJ_NONE)
2151 #define POI_STACK_PREALLOC 64
2153 static enum object_type packed_to_object_type(struct packed_git *p,
2155 enum object_type type,
2156 struct pack_window **w_curs,
2159 off_t small_poi_stack[POI_STACK_PREALLOC];
2160 off_t *poi_stack = small_poi_stack;
2161 int poi_stack_nr = 0, poi_stack_alloc = POI_STACK_PREALLOC;
2163 while (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
2166 /* Push the object we're going to leave behind */
2167 if (poi_stack_nr >= poi_stack_alloc && poi_stack == small_poi_stack) {
2168 poi_stack_alloc = alloc_nr(poi_stack_nr);
2169 ALLOC_ARRAY(poi_stack, poi_stack_alloc);
2170 memcpy(poi_stack, small_poi_stack, sizeof(off_t)*poi_stack_nr);
2172 ALLOC_GROW(poi_stack, poi_stack_nr+1, poi_stack_alloc);
2174 poi_stack[poi_stack_nr++] = obj_offset;
2175 /* If parsing the base offset fails, just unwind */
2176 base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset);
2179 curpos = obj_offset = base_offset;
2180 type = unpack_object_header(p, w_curs, &curpos, &size);
2181 if (type <= OBJ_NONE) {
2182 /* If getting the base itself fails, we first
2183 * retry the base, otherwise unwind */
2184 type = retry_bad_packed_offset(p, base_offset);
2185 if (type > OBJ_NONE)
2199 error("unknown object type %i at offset %"PRIuMAX" in %s",
2200 type, (uintmax_t)obj_offset, p->pack_name);
2205 if (poi_stack != small_poi_stack)
2210 while (poi_stack_nr) {
2211 obj_offset = poi_stack[--poi_stack_nr];
2212 type = retry_bad_packed_offset(p, obj_offset);
2213 if (type > OBJ_NONE)
2220 static struct hashmap delta_base_cache;
2221 static size_t delta_base_cached;
2223 static LIST_HEAD(delta_base_cache_lru);
2225 struct delta_base_cache_key {
2226 struct packed_git *p;
2230 struct delta_base_cache_entry {
2231 struct hashmap hash;
2232 struct delta_base_cache_key key;
2233 struct list_head lru;
2236 enum object_type type;
2239 static unsigned int pack_entry_hash(struct packed_git *p, off_t base_offset)
2243 hash = (unsigned int)(intptr_t)p + (unsigned int)base_offset;
2244 hash += (hash >> 8) + (hash >> 16);
2248 static struct delta_base_cache_entry *
2249 get_delta_base_cache_entry(struct packed_git *p, off_t base_offset)
2251 struct hashmap_entry entry;
2252 struct delta_base_cache_key key;
2254 if (!delta_base_cache.cmpfn)
2257 hashmap_entry_init(&entry, pack_entry_hash(p, base_offset));
2259 key.base_offset = base_offset;
2260 return hashmap_get(&delta_base_cache, &entry, &key);
2263 static int delta_base_cache_key_eq(const struct delta_base_cache_key *a,
2264 const struct delta_base_cache_key *b)
2266 return a->p == b->p && a->base_offset == b->base_offset;
2269 static int delta_base_cache_hash_cmp(const void *unused_cmp_data,
2270 const void *va, const void *vb,
2273 const struct delta_base_cache_entry *a = va, *b = vb;
2274 const struct delta_base_cache_key *key = vkey;
2276 return !delta_base_cache_key_eq(&a->key, key);
2278 return !delta_base_cache_key_eq(&a->key, &b->key);
2281 static int in_delta_base_cache(struct packed_git *p, off_t base_offset)
2283 return !!get_delta_base_cache_entry(p, base_offset);
2287 * Remove the entry from the cache, but do _not_ free the associated
2288 * entry data. The caller takes ownership of the "data" buffer, and
2289 * should copy out any fields it wants before detaching.
2291 static void detach_delta_base_cache_entry(struct delta_base_cache_entry *ent)
2293 hashmap_remove(&delta_base_cache, ent, &ent->key);
2294 list_del(&ent->lru);
2295 delta_base_cached -= ent->size;
2299 static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset,
2300 unsigned long *base_size, enum object_type *type)
2302 struct delta_base_cache_entry *ent;
2304 ent = get_delta_base_cache_entry(p, base_offset);
2306 return unpack_entry(p, base_offset, type, base_size);
2311 *base_size = ent->size;
2312 return xmemdupz(ent->data, ent->size);
2315 static inline void release_delta_base_cache(struct delta_base_cache_entry *ent)
2318 detach_delta_base_cache_entry(ent);
2321 void clear_delta_base_cache(void)
2323 struct list_head *lru, *tmp;
2324 list_for_each_safe(lru, tmp, &delta_base_cache_lru) {
2325 struct delta_base_cache_entry *entry =
2326 list_entry(lru, struct delta_base_cache_entry, lru);
2327 release_delta_base_cache(entry);
2331 static void add_delta_base_cache(struct packed_git *p, off_t base_offset,
2332 void *base, unsigned long base_size, enum object_type type)
2334 struct delta_base_cache_entry *ent = xmalloc(sizeof(*ent));
2335 struct list_head *lru, *tmp;
2337 delta_base_cached += base_size;
2339 list_for_each_safe(lru, tmp, &delta_base_cache_lru) {
2340 struct delta_base_cache_entry *f =
2341 list_entry(lru, struct delta_base_cache_entry, lru);
2342 if (delta_base_cached <= delta_base_cache_limit)
2344 release_delta_base_cache(f);
2348 ent->key.base_offset = base_offset;
2351 ent->size = base_size;
2352 list_add_tail(&ent->lru, &delta_base_cache_lru);
2354 if (!delta_base_cache.cmpfn)
2355 hashmap_init(&delta_base_cache, delta_base_cache_hash_cmp, NULL, 0);
2356 hashmap_entry_init(ent, pack_entry_hash(p, base_offset));
2357 hashmap_add(&delta_base_cache, ent);
2360 int packed_object_info(struct packed_git *p, off_t obj_offset,
2361 struct object_info *oi)
2363 struct pack_window *w_curs = NULL;
2365 off_t curpos = obj_offset;
2366 enum object_type type;
2369 * We always get the representation type, but only convert it to
2370 * a "real" type later if the caller is interested.
2373 *oi->contentp = cache_or_unpack_entry(p, obj_offset, oi->sizep,
2378 type = unpack_object_header(p, &w_curs, &curpos, &size);
2381 if (!oi->contentp && oi->sizep) {
2382 if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
2383 off_t tmp_pos = curpos;
2384 off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos,
2390 *oi->sizep = get_size_from_delta(p, &w_curs, tmp_pos);
2391 if (*oi->sizep == 0) {
2400 if (oi->disk_sizep) {
2401 struct revindex_entry *revidx = find_pack_revindex(p, obj_offset);
2402 *oi->disk_sizep = revidx[1].offset - obj_offset;
2405 if (oi->typep || oi->typename) {
2406 enum object_type ptot;
2407 ptot = packed_to_object_type(p, obj_offset, type, &w_curs,
2412 const char *tn = typename(ptot);
2414 strbuf_addstr(oi->typename, tn);
2422 if (oi->delta_base_sha1) {
2423 if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
2424 const unsigned char *base;
2426 base = get_delta_base_sha1(p, &w_curs, curpos,
2433 hashcpy(oi->delta_base_sha1, base);
2435 hashclr(oi->delta_base_sha1);
2439 unuse_pack(&w_curs);
2443 static void *unpack_compressed_entry(struct packed_git *p,
2444 struct pack_window **w_curs,
2450 unsigned char *buffer, *in;
2452 buffer = xmallocz_gently(size);
2455 memset(&stream, 0, sizeof(stream));
2456 stream.next_out = buffer;
2457 stream.avail_out = size + 1;
2459 git_inflate_init(&stream);
2461 in = use_pack(p, w_curs, curpos, &stream.avail_in);
2462 stream.next_in = in;
2463 st = git_inflate(&stream, Z_FINISH);
2464 if (!stream.avail_out)
2465 break; /* the payload is larger than it should be */
2466 curpos += stream.next_in - in;
2467 } while (st == Z_OK || st == Z_BUF_ERROR);
2468 git_inflate_end(&stream);
2469 if ((st != Z_STREAM_END) || stream.total_out != size) {
2477 static void *read_object(const unsigned char *sha1, enum object_type *type,
2478 unsigned long *size);
2480 static void write_pack_access_log(struct packed_git *p, off_t obj_offset)
2482 static struct trace_key pack_access = TRACE_KEY_INIT(PACK_ACCESS);
2483 trace_printf_key(&pack_access, "%s %"PRIuMAX"\n",
2484 p->pack_name, (uintmax_t)obj_offset);
2487 int do_check_packed_object_crc;
2489 #define UNPACK_ENTRY_STACK_PREALLOC 64
2490 struct unpack_entry_stack_ent {
2496 void *unpack_entry(struct packed_git *p, off_t obj_offset,
2497 enum object_type *final_type, unsigned long *final_size)
2499 struct pack_window *w_curs = NULL;
2500 off_t curpos = obj_offset;
2503 enum object_type type;
2504 struct unpack_entry_stack_ent small_delta_stack[UNPACK_ENTRY_STACK_PREALLOC];
2505 struct unpack_entry_stack_ent *delta_stack = small_delta_stack;
2506 int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC;
2507 int base_from_cache = 0;
2509 write_pack_access_log(p, obj_offset);
2511 /* PHASE 1: drill down to the innermost base object */
2515 struct delta_base_cache_entry *ent;
2517 ent = get_delta_base_cache_entry(p, curpos);
2522 detach_delta_base_cache_entry(ent);
2523 base_from_cache = 1;
2527 if (do_check_packed_object_crc && p->index_version > 1) {
2528 struct revindex_entry *revidx = find_pack_revindex(p, obj_offset);
2529 off_t len = revidx[1].offset - obj_offset;
2530 if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) {
2531 const unsigned char *sha1 =
2532 nth_packed_object_sha1(p, revidx->nr);
2533 error("bad packed object CRC for %s",
2535 mark_bad_packed_object(p, sha1);
2541 type = unpack_object_header(p, &w_curs, &curpos, &size);
2542 if (type != OBJ_OFS_DELTA && type != OBJ_REF_DELTA)
2545 base_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset);
2547 error("failed to validate delta base reference "
2548 "at offset %"PRIuMAX" from %s",
2549 (uintmax_t)curpos, p->pack_name);
2550 /* bail to phase 2, in hopes of recovery */
2555 /* push object, proceed to base */
2556 if (delta_stack_nr >= delta_stack_alloc
2557 && delta_stack == small_delta_stack) {
2558 delta_stack_alloc = alloc_nr(delta_stack_nr);
2559 ALLOC_ARRAY(delta_stack, delta_stack_alloc);
2560 memcpy(delta_stack, small_delta_stack,
2561 sizeof(*delta_stack)*delta_stack_nr);
2563 ALLOC_GROW(delta_stack, delta_stack_nr+1, delta_stack_alloc);
2565 i = delta_stack_nr++;
2566 delta_stack[i].obj_offset = obj_offset;
2567 delta_stack[i].curpos = curpos;
2568 delta_stack[i].size = size;
2570 curpos = obj_offset = base_offset;
2573 /* PHASE 2: handle the base */
2578 die("BUG: unpack_entry: left loop at a valid delta");
2584 if (!base_from_cache)
2585 data = unpack_compressed_entry(p, &w_curs, curpos, size);
2589 error("unknown object type %i at offset %"PRIuMAX" in %s",
2590 type, (uintmax_t)obj_offset, p->pack_name);
2593 /* PHASE 3: apply deltas in order */
2596 * 'data' holds the base data, or NULL if there was corruption
2598 while (delta_stack_nr) {
2601 void *external_base = NULL;
2602 unsigned long delta_size, base_size = size;
2608 add_delta_base_cache(p, obj_offset, base, base_size, type);
2612 * We're probably in deep shit, but let's try to fetch
2613 * the required base anyway from another pack or loose.
2614 * This is costly but should happen only in the presence
2615 * of a corrupted pack, and is better than failing outright.
2617 struct revindex_entry *revidx;
2618 const unsigned char *base_sha1;
2619 revidx = find_pack_revindex(p, obj_offset);
2621 base_sha1 = nth_packed_object_sha1(p, revidx->nr);
2622 error("failed to read delta base object %s"
2623 " at offset %"PRIuMAX" from %s",
2624 sha1_to_hex(base_sha1), (uintmax_t)obj_offset,
2626 mark_bad_packed_object(p, base_sha1);
2627 base = read_object(base_sha1, &type, &base_size);
2628 external_base = base;
2632 i = --delta_stack_nr;
2633 obj_offset = delta_stack[i].obj_offset;
2634 curpos = delta_stack[i].curpos;
2635 delta_size = delta_stack[i].size;
2640 delta_data = unpack_compressed_entry(p, &w_curs, curpos, delta_size);
2643 error("failed to unpack compressed delta "
2644 "at offset %"PRIuMAX" from %s",
2645 (uintmax_t)curpos, p->pack_name);
2647 free(external_base);
2651 data = patch_delta(base, base_size,
2652 delta_data, delta_size,
2656 * We could not apply the delta; warn the user, but keep going.
2657 * Our failure will be noticed either in the next iteration of
2658 * the loop, or if this is the final delta, in the caller when
2659 * we return NULL. Those code paths will take care of making
2660 * a more explicit warning and retrying with another copy of
2664 error("failed to apply delta");
2667 free(external_base);
2676 unuse_pack(&w_curs);
2678 if (delta_stack != small_delta_stack)
2684 const unsigned char *nth_packed_object_sha1(struct packed_git *p,
2687 const unsigned char *index = p->index_data;
2689 if (open_pack_index(p))
2691 index = p->index_data;
2693 if (n >= p->num_objects)
2696 if (p->index_version == 1) {
2697 return index + 24 * n + 4;
2700 return index + 20 * n;
2704 const struct object_id *nth_packed_object_oid(struct object_id *oid,
2705 struct packed_git *p,
2708 const unsigned char *hash = nth_packed_object_sha1(p, n);
2711 hashcpy(oid->hash, hash);
2715 void check_pack_index_ptr(const struct packed_git *p, const void *vptr)
2717 const unsigned char *ptr = vptr;
2718 const unsigned char *start = p->index_data;
2719 const unsigned char *end = start + p->index_size;
2721 die(_("offset before start of pack index for %s (corrupt index?)"),
2723 /* No need to check for underflow; .idx files must be at least 8 bytes */
2725 die(_("offset beyond end of pack index for %s (truncated index?)"),
2729 off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n)
2731 const unsigned char *index = p->index_data;
2733 if (p->index_version == 1) {
2734 return ntohl(*((uint32_t *)(index + 24 * n)));
2737 index += 8 + p->num_objects * (20 + 4);
2738 off = ntohl(*((uint32_t *)(index + 4 * n)));
2739 if (!(off & 0x80000000))
2741 index += p->num_objects * 4 + (off & 0x7fffffff) * 8;
2742 check_pack_index_ptr(p, index);
2743 return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) |
2744 ntohl(*((uint32_t *)(index + 4)));
2748 off_t find_pack_entry_one(const unsigned char *sha1,
2749 struct packed_git *p)
2751 const uint32_t *level1_ofs = p->index_data;
2752 const unsigned char *index = p->index_data;
2753 unsigned hi, lo, stride;
2754 static int use_lookup = -1;
2755 static int debug_lookup = -1;
2757 if (debug_lookup < 0)
2758 debug_lookup = !!getenv("GIT_DEBUG_LOOKUP");
2761 if (open_pack_index(p))
2763 level1_ofs = p->index_data;
2764 index = p->index_data;
2766 if (p->index_version > 1) {
2771 hi = ntohl(level1_ofs[*sha1]);
2772 lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
2773 if (p->index_version > 1) {
2781 printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n",
2782 sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects);
2785 use_lookup = !!getenv("GIT_USE_LOOKUP");
2787 int pos = sha1_entry_pos(index, stride, 0,
2788 lo, hi, p->num_objects, sha1);
2791 return nth_packed_object_offset(p, pos);
2795 unsigned mi = (lo + hi) / 2;
2796 int cmp = hashcmp(index + mi * stride, sha1);
2799 printf("lo %u hi %u rg %u mi %u\n",
2800 lo, hi, hi - lo, mi);
2802 return nth_packed_object_offset(p, mi);
2811 int is_pack_valid(struct packed_git *p)
2813 /* An already open pack is known to be valid. */
2814 if (p->pack_fd != -1)
2817 /* If the pack has one window completely covering the
2818 * file size, the pack is known to be valid even if
2819 * the descriptor is not currently open.
2822 struct pack_window *w = p->windows;
2824 if (!w->offset && w->len == p->pack_size)
2828 /* Force the pack to open to prove its valid. */
2829 return !open_packed_git(p);
2832 static int fill_pack_entry(const unsigned char *sha1,
2833 struct pack_entry *e,
2834 struct packed_git *p)
2838 if (p->num_bad_objects) {
2840 for (i = 0; i < p->num_bad_objects; i++)
2841 if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i))
2845 offset = find_pack_entry_one(sha1, p);
2850 * We are about to tell the caller where they can locate the
2851 * requested object. We better make sure the packfile is
2852 * still here and can be accessed before supplying that
2853 * answer, as it may have been deleted since the index was
2856 if (!is_pack_valid(p))
2860 hashcpy(e->sha1, sha1);
2865 * Iff a pack file contains the object named by sha1, return true and
2866 * store its location to e.
2868 static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e)
2870 struct mru_entry *p;
2872 prepare_packed_git();
2876 for (p = packed_git_mru->head; p; p = p->next) {
2877 if (fill_pack_entry(sha1, e, p->item)) {
2878 mru_mark(packed_git_mru, p);
2885 struct packed_git *find_sha1_pack(const unsigned char *sha1,
2886 struct packed_git *packs)
2888 struct packed_git *p;
2890 for (p = packs; p; p = p->next) {
2891 if (find_pack_entry_one(sha1, p))
2898 static int sha1_loose_object_info(const unsigned char *sha1,
2899 struct object_info *oi,
2903 unsigned long mapsize;
2907 struct strbuf hdrbuf = STRBUF_INIT;
2908 unsigned long size_scratch;
2910 if (oi->delta_base_sha1)
2911 hashclr(oi->delta_base_sha1);
2914 * If we don't care about type or size, then we don't
2915 * need to look inside the object at all. Note that we
2916 * do not optimize out the stat call, even if the
2917 * caller doesn't care about the disk-size, since our
2918 * return value implicitly indicates whether the
2919 * object even exists.
2921 if (!oi->typep && !oi->typename && !oi->sizep && !oi->contentp) {
2924 if (stat_sha1_file(sha1, &st, &path) < 0)
2927 *oi->disk_sizep = st.st_size;
2931 map = map_sha1_file(sha1, &mapsize);
2936 oi->sizep = &size_scratch;
2939 *oi->disk_sizep = mapsize;
2940 if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) {
2941 if (unpack_sha1_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0)
2942 status = error("unable to unpack %s header with --allow-unknown-type",
2944 } else if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
2945 status = error("unable to unpack %s header",
2949 else if (hdrbuf.len) {
2950 if ((status = parse_sha1_header_extended(hdrbuf.buf, oi, flags)) < 0)
2951 status = error("unable to parse %s header with --allow-unknown-type",
2953 } else if ((status = parse_sha1_header_extended(hdr, oi, flags)) < 0)
2954 status = error("unable to parse %s header", sha1_to_hex(sha1));
2956 if (status >= 0 && oi->contentp)
2957 *oi->contentp = unpack_sha1_rest(&stream, hdr,
2960 git_inflate_end(&stream);
2962 munmap(map, mapsize);
2963 if (status && oi->typep)
2964 *oi->typep = status;
2965 if (oi->sizep == &size_scratch)
2967 strbuf_release(&hdrbuf);
2968 return (status < 0) ? status : 0;
2971 int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags)
2973 static struct object_info blank_oi = OBJECT_INFO_INIT;
2974 struct pack_entry e;
2976 const unsigned char *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ?
2977 lookup_replace_object(sha1) :
2983 if (!(flags & OBJECT_INFO_SKIP_CACHED)) {
2984 struct cached_object *co = find_cached_object(real);
2987 *(oi->typep) = co->type;
2989 *(oi->sizep) = co->size;
2991 *(oi->disk_sizep) = 0;
2992 if (oi->delta_base_sha1)
2993 hashclr(oi->delta_base_sha1);
2995 strbuf_addstr(oi->typename, typename(co->type));
2997 *oi->contentp = xmemdupz(co->buf, co->size);
2998 oi->whence = OI_CACHED;
3003 if (!find_pack_entry(real, &e)) {
3004 /* Most likely it's a loose object. */
3005 if (!sha1_loose_object_info(real, oi, flags)) {
3006 oi->whence = OI_LOOSE;
3010 /* Not a loose object; someone else may have just packed it. */
3011 if (flags & OBJECT_INFO_QUICK) {
3014 reprepare_packed_git();
3015 if (!find_pack_entry(real, &e))
3020 if (oi == &blank_oi)
3022 * We know that the caller doesn't actually need the
3023 * information below, so return early.
3027 rtype = packed_object_info(e.p, e.offset, oi);
3029 mark_bad_packed_object(e.p, real);
3030 return sha1_object_info_extended(real, oi, 0);
3031 } else if (in_delta_base_cache(e.p, e.offset)) {
3032 oi->whence = OI_DBCACHED;
3034 oi->whence = OI_PACKED;
3035 oi->u.packed.offset = e.offset;
3036 oi->u.packed.pack = e.p;
3037 oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA ||
3038 rtype == OBJ_OFS_DELTA);
3044 /* returns enum object_type or negative */
3045 int sha1_object_info(const unsigned char *sha1, unsigned long *sizep)
3047 enum object_type type;
3048 struct object_info oi = OBJECT_INFO_INIT;
3052 if (sha1_object_info_extended(sha1, &oi,
3053 OBJECT_INFO_LOOKUP_REPLACE) < 0)
3058 static void *read_packed_sha1(const unsigned char *sha1,
3059 enum object_type *type, unsigned long *size)
3061 struct pack_entry e;
3064 if (!find_pack_entry(sha1, &e))
3066 data = cache_or_unpack_entry(e.p, e.offset, size, type);
3069 * We're probably in deep shit, but let's try to fetch
3070 * the required object anyway from another pack or loose.
3071 * This should happen only in the presence of a corrupted
3072 * pack, and is better than failing outright.
3074 error("failed to read object %s at offset %"PRIuMAX" from %s",
3075 sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name);
3076 mark_bad_packed_object(e.p, sha1);
3077 data = read_object(sha1, type, size);
3082 int pretend_sha1_file(void *buf, unsigned long len, enum object_type type,
3083 unsigned char *sha1)
3085 struct cached_object *co;
3087 hash_sha1_file(buf, len, typename(type), sha1);
3088 if (has_sha1_file(sha1) || find_cached_object(sha1))
3090 ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc);
3091 co = &cached_objects[cached_object_nr++];
3094 co->buf = xmalloc(len);
3095 memcpy(co->buf, buf, len);
3096 hashcpy(co->sha1, sha1);
3100 static void *read_object(const unsigned char *sha1, enum object_type *type,
3101 unsigned long *size)
3103 struct object_info oi = OBJECT_INFO_INIT;
3107 oi.contentp = &content;
3109 if (sha1_object_info_extended(sha1, &oi, 0) < 0)
3115 * This function dies on corrupt objects; the callers who want to
3116 * deal with them should arrange to call read_object() and give error
3117 * messages themselves.
3119 void *read_sha1_file_extended(const unsigned char *sha1,
3120 enum object_type *type,
3121 unsigned long *size,
3125 const struct packed_git *p;
3128 const unsigned char *repl = lookup_replace ? lookup_replace_object(sha1)
3132 data = read_object(repl, type, size);
3136 if (errno && errno != ENOENT)
3137 die_errno("failed to read object %s", sha1_to_hex(sha1));
3139 /* die if we replaced an object with one that does not exist */
3141 die("replacement %s not found for %s",
3142 sha1_to_hex(repl), sha1_to_hex(sha1));
3144 if (!stat_sha1_file(repl, &st, &path))
3145 die("loose object %s (stored in %s) is corrupt",
3146 sha1_to_hex(repl), path);
3148 if ((p = has_packed_and_bad(repl)) != NULL)
3149 die("packed object %s (stored in %s) is corrupt",
3150 sha1_to_hex(repl), p->pack_name);
3155 void *read_object_with_reference(const unsigned char *sha1,
3156 const char *required_type_name,
3157 unsigned long *size,
3158 unsigned char *actual_sha1_return)
3160 enum object_type type, required_type;
3162 unsigned long isize;
3163 unsigned char actual_sha1[20];
3165 required_type = type_from_string(required_type_name);
3166 hashcpy(actual_sha1, sha1);
3168 int ref_length = -1;
3169 const char *ref_type = NULL;
3171 buffer = read_sha1_file(actual_sha1, &type, &isize);
3174 if (type == required_type) {
3176 if (actual_sha1_return)
3177 hashcpy(actual_sha1_return, actual_sha1);
3180 /* Handle references */
3181 else if (type == OBJ_COMMIT)
3183 else if (type == OBJ_TAG)
3184 ref_type = "object ";
3189 ref_length = strlen(ref_type);
3191 if (ref_length + 40 > isize ||
3192 memcmp(buffer, ref_type, ref_length) ||
3193 get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
3198 /* Now we have the ID of the referred-to object in
3199 * actual_sha1. Check again. */
3203 static void write_sha1_file_prepare(const void *buf, unsigned long len,
3204 const char *type, unsigned char *sha1,
3205 char *hdr, int *hdrlen)
3209 /* Generate the header */
3210 *hdrlen = xsnprintf(hdr, *hdrlen, "%s %lu", type, len)+1;
3214 git_SHA1_Update(&c, hdr, *hdrlen);
3215 git_SHA1_Update(&c, buf, len);
3216 git_SHA1_Final(sha1, &c);
3220 * Move the just written object into its final resting place.
3222 int finalize_object_file(const char *tmpfile, const char *filename)
3226 if (object_creation_mode == OBJECT_CREATION_USES_RENAMES)
3228 else if (link(tmpfile, filename))
3232 * Coda hack - coda doesn't like cross-directory links,
3233 * so we fall back to a rename, which will mean that it
3234 * won't be able to check collisions, but that's not a
3237 * The same holds for FAT formatted media.
3239 * When this succeeds, we just return. We have nothing
3242 if (ret && ret != EEXIST) {
3244 if (!rename(tmpfile, filename))
3248 unlink_or_warn(tmpfile);
3250 if (ret != EEXIST) {
3251 return error_errno("unable to write sha1 filename %s", filename);
3253 /* FIXME!!! Collision check here ? */
3257 if (adjust_shared_perm(filename))
3258 return error("unable to set permission to '%s'", filename);
3262 static int write_buffer(int fd, const void *buf, size_t len)
3264 if (write_in_full(fd, buf, len) < 0)
3265 return error_errno("file write error");
3269 int hash_sha1_file(const void *buf, unsigned long len, const char *type,
3270 unsigned char *sha1)
3273 int hdrlen = sizeof(hdr);
3274 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
3278 /* Finalize a file on disk, and close it. */
3279 static void close_sha1_file(int fd)
3281 if (fsync_object_files)
3282 fsync_or_die(fd, "sha1 file");
3284 die_errno("error when closing sha1 file");
3287 /* Size of directory component, including the ending '/' */
3288 static inline int directory_size(const char *filename)
3290 const char *s = strrchr(filename, '/');
3293 return s - filename + 1;
3297 * This creates a temporary file in the same directory as the final
3300 * We want to avoid cross-directory filename renames, because those
3301 * can have problems on various filesystems (FAT, NFS, Coda).
3303 static int create_tmpfile(struct strbuf *tmp, const char *filename)
3305 int fd, dirlen = directory_size(filename);
3308 strbuf_add(tmp, filename, dirlen);
3309 strbuf_addstr(tmp, "tmp_obj_XXXXXX");
3310 fd = git_mkstemp_mode(tmp->buf, 0444);
3311 if (fd < 0 && dirlen && errno == ENOENT) {
3313 * Make sure the directory exists; note that the contents
3314 * of the buffer are undefined after mkstemp returns an
3315 * error, so we have to rewrite the whole buffer from
3319 strbuf_add(tmp, filename, dirlen - 1);
3320 if (mkdir(tmp->buf, 0777) && errno != EEXIST)
3322 if (adjust_shared_perm(tmp->buf))
3326 strbuf_addstr(tmp, "/tmp_obj_XXXXXX");
3327 fd = git_mkstemp_mode(tmp->buf, 0444);
3332 static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
3333 const void *buf, unsigned long len, time_t mtime)
3336 unsigned char compressed[4096];
3339 unsigned char parano_sha1[20];
3340 static struct strbuf tmp_file = STRBUF_INIT;
3341 const char *filename = sha1_file_name(sha1);
3343 fd = create_tmpfile(&tmp_file, filename);
3345 if (errno == EACCES)
3346 return error("insufficient permission for adding an object to repository database %s", get_object_directory());
3348 return error_errno("unable to create temporary file");
3352 git_deflate_init(&stream, zlib_compression_level);
3353 stream.next_out = compressed;
3354 stream.avail_out = sizeof(compressed);
3357 /* First header.. */
3358 stream.next_in = (unsigned char *)hdr;
3359 stream.avail_in = hdrlen;
3360 while (git_deflate(&stream, 0) == Z_OK)
3362 git_SHA1_Update(&c, hdr, hdrlen);
3364 /* Then the data itself.. */
3365 stream.next_in = (void *)buf;
3366 stream.avail_in = len;
3368 unsigned char *in0 = stream.next_in;
3369 ret = git_deflate(&stream, Z_FINISH);
3370 git_SHA1_Update(&c, in0, stream.next_in - in0);
3371 if (write_buffer(fd, compressed, stream.next_out - compressed) < 0)
3372 die("unable to write sha1 file");
3373 stream.next_out = compressed;
3374 stream.avail_out = sizeof(compressed);
3375 } while (ret == Z_OK);
3377 if (ret != Z_STREAM_END)
3378 die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret);
3379 ret = git_deflate_end_gently(&stream);
3381 die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret);
3382 git_SHA1_Final(parano_sha1, &c);
3383 if (hashcmp(sha1, parano_sha1) != 0)
3384 die("confused by unstable object source data for %s", sha1_to_hex(sha1));
3386 close_sha1_file(fd);
3391 utb.modtime = mtime;
3392 if (utime(tmp_file.buf, &utb) < 0)
3393 warning_errno("failed utime() on %s", tmp_file.buf);
3396 return finalize_object_file(tmp_file.buf, filename);
3399 static int freshen_loose_object(const unsigned char *sha1)
3401 return check_and_freshen(sha1, 1);
3404 static int freshen_packed_object(const unsigned char *sha1)
3406 struct pack_entry e;
3407 if (!find_pack_entry(sha1, &e))
3411 if (!freshen_file(e.p->pack_name))
3417 int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1)
3420 int hdrlen = sizeof(hdr);
3422 /* Normally if we have it in the pack then we do not bother writing
3423 * it out into .git/objects/??/?{38} file.
3425 write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
3426 if (freshen_packed_object(sha1) || freshen_loose_object(sha1))
3428 return write_loose_object(sha1, hdr, hdrlen, buf, len, 0);
3431 int hash_sha1_file_literally(const void *buf, unsigned long len, const char *type,
3432 unsigned char *sha1, unsigned flags)
3435 int hdrlen, status = 0;
3437 /* type string, SP, %lu of the length plus NUL must fit this */
3438 hdrlen = strlen(type) + 32;
3439 header = xmalloc(hdrlen);
3440 write_sha1_file_prepare(buf, len, type, sha1, header, &hdrlen);
3442 if (!(flags & HASH_WRITE_OBJECT))
3444 if (freshen_packed_object(sha1) || freshen_loose_object(sha1))
3446 status = write_loose_object(sha1, header, hdrlen, buf, len, 0);
3453 int force_object_loose(const unsigned char *sha1, time_t mtime)
3457 enum object_type type;
3462 if (has_loose_object(sha1))
3464 buf = read_packed_sha1(sha1, &type, &len);
3466 return error("cannot read sha1_file for %s", sha1_to_hex(sha1));
3467 hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1;
3468 ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime);
3474 int has_pack_index(const unsigned char *sha1)
3477 if (stat(sha1_pack_index_name(sha1), &st))
3482 int has_sha1_pack(const unsigned char *sha1)
3484 struct pack_entry e;
3485 return find_pack_entry(sha1, &e);
3488 int has_sha1_file_with_flags(const unsigned char *sha1, int flags)
3490 if (!startup_info->have_repository)
3492 return sha1_object_info_extended(sha1, NULL,
3493 flags | OBJECT_INFO_SKIP_CACHED) >= 0;
3496 int has_object_file(const struct object_id *oid)
3498 return has_sha1_file(oid->hash);
3501 int has_object_file_with_flags(const struct object_id *oid, int flags)
3503 return has_sha1_file_with_flags(oid->hash, flags);
3506 static void check_tree(const void *buf, size_t size)
3508 struct tree_desc desc;
3509 struct name_entry entry;
3511 init_tree_desc(&desc, buf, size);
3512 while (tree_entry(&desc, &entry))
3514 * tree_entry() will die() on malformed entries */
3518 static void check_commit(const void *buf, size_t size)
3521 memset(&c, 0, sizeof(c));
3522 if (parse_commit_buffer(&c, buf, size))
3523 die("corrupt commit");
3526 static void check_tag(const void *buf, size_t size)
3529 memset(&t, 0, sizeof(t));
3530 if (parse_tag_buffer(&t, buf, size))
3534 static int index_mem(unsigned char *sha1, void *buf, size_t size,
3535 enum object_type type,
3536 const char *path, unsigned flags)
3538 int ret, re_allocated = 0;
3539 int write_object = flags & HASH_WRITE_OBJECT;
3545 * Convert blobs to git internal format
3547 if ((type == OBJ_BLOB) && path) {
3548 struct strbuf nbuf = STRBUF_INIT;
3549 if (convert_to_git(&the_index, path, buf, size, &nbuf,
3550 write_object ? safe_crlf : SAFE_CRLF_FALSE)) {
3551 buf = strbuf_detach(&nbuf, &size);
3555 if (flags & HASH_FORMAT_CHECK) {
3556 if (type == OBJ_TREE)
3557 check_tree(buf, size);
3558 if (type == OBJ_COMMIT)
3559 check_commit(buf, size);
3560 if (type == OBJ_TAG)
3561 check_tag(buf, size);
3565 ret = write_sha1_file(buf, size, typename(type), sha1);
3567 ret = hash_sha1_file(buf, size, typename(type), sha1);
3573 static int index_stream_convert_blob(unsigned char *sha1, int fd,
3574 const char *path, unsigned flags)
3577 const int write_object = flags & HASH_WRITE_OBJECT;
3578 struct strbuf sbuf = STRBUF_INIT;
3581 assert(would_convert_to_git_filter_fd(path));
3583 convert_to_git_filter_fd(&the_index, path, fd, &sbuf,
3584 write_object ? safe_crlf : SAFE_CRLF_FALSE);
3587 ret = write_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB),
3590 ret = hash_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB),
3592 strbuf_release(&sbuf);
3596 static int index_pipe(unsigned char *sha1, int fd, enum object_type type,
3597 const char *path, unsigned flags)
3599 struct strbuf sbuf = STRBUF_INIT;
3602 if (strbuf_read(&sbuf, fd, 4096) >= 0)
3603 ret = index_mem(sha1, sbuf.buf, sbuf.len, type, path, flags);
3606 strbuf_release(&sbuf);
3610 #define SMALL_FILE_SIZE (32*1024)
3612 static int index_core(unsigned char *sha1, int fd, size_t size,
3613 enum object_type type, const char *path,
3619 ret = index_mem(sha1, "", size, type, path, flags);
3620 } else if (size <= SMALL_FILE_SIZE) {
3621 char *buf = xmalloc(size);
3622 if (size == read_in_full(fd, buf, size))
3623 ret = index_mem(sha1, buf, size, type, path, flags);
3625 ret = error_errno("short read");
3628 void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
3629 ret = index_mem(sha1, buf, size, type, path, flags);
3636 * This creates one packfile per large blob unless bulk-checkin
3637 * machinery is "plugged".
3639 * This also bypasses the usual "convert-to-git" dance, and that is on
3640 * purpose. We could write a streaming version of the converting
3641 * functions and insert that before feeding the data to fast-import
3642 * (or equivalent in-core API described above). However, that is
3643 * somewhat complicated, as we do not know the size of the filter
3644 * result, which we need to know beforehand when writing a git object.
3645 * Since the primary motivation for trying to stream from the working
3646 * tree file and to avoid mmaping it in core is to deal with large
3647 * binary blobs, they generally do not want to get any conversion, and
3648 * callers should avoid this code path when filters are requested.
3650 static int index_stream(unsigned char *sha1, int fd, size_t size,
3651 enum object_type type, const char *path,
3654 return index_bulk_checkin(sha1, fd, size, type, path, flags);
3657 int index_fd(unsigned char *sha1, int fd, struct stat *st,
3658 enum object_type type, const char *path, unsigned flags)
3663 * Call xsize_t() only when needed to avoid potentially unnecessary
3664 * die() for large files.
3666 if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(path))
3667 ret = index_stream_convert_blob(sha1, fd, path, flags);
3668 else if (!S_ISREG(st->st_mode))
3669 ret = index_pipe(sha1, fd, type, path, flags);
3670 else if (st->st_size <= big_file_threshold || type != OBJ_BLOB ||
3671 (path && would_convert_to_git(&the_index, path)))
3672 ret = index_core(sha1, fd, xsize_t(st->st_size), type, path,
3675 ret = index_stream(sha1, fd, xsize_t(st->st_size), type, path,
3681 int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags)
3684 struct strbuf sb = STRBUF_INIT;
3686 switch (st->st_mode & S_IFMT) {
3688 fd = open(path, O_RDONLY);
3690 return error_errno("open(\"%s\")", path);
3691 if (index_fd(sha1, fd, st, OBJ_BLOB, path, flags) < 0)
3692 return error("%s: failed to insert into database",
3696 if (strbuf_readlink(&sb, path, st->st_size))
3697 return error_errno("readlink(\"%s\")", path);
3698 if (!(flags & HASH_WRITE_OBJECT))
3699 hash_sha1_file(sb.buf, sb.len, blob_type, sha1);
3700 else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1))
3701 return error("%s: failed to insert into database",
3703 strbuf_release(&sb);
3706 return resolve_gitlink_ref(path, "HEAD", sha1);
3708 return error("%s: unsupported file type", path);
3713 int read_pack_header(int fd, struct pack_header *header)
3715 if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header))
3716 /* "eof before pack header was fully read" */
3717 return PH_ERROR_EOF;
3719 if (header->hdr_signature != htonl(PACK_SIGNATURE))
3720 /* "protocol error (pack signature mismatch detected)" */
3721 return PH_ERROR_PACK_SIGNATURE;
3722 if (!pack_version_ok(header->hdr_version))
3723 /* "protocol error (pack version unsupported)" */
3724 return PH_ERROR_PROTOCOL;
3728 void assert_sha1_type(const unsigned char *sha1, enum object_type expect)
3730 enum object_type type = sha1_object_info(sha1, NULL);
3732 die("%s is not a valid object", sha1_to_hex(sha1));
3734 die("%s is not a valid '%s' object", sha1_to_hex(sha1),
3738 int for_each_file_in_obj_subdir(unsigned int subdir_nr,
3739 struct strbuf *path,
3740 each_loose_object_fn obj_cb,
3741 each_loose_cruft_fn cruft_cb,
3742 each_loose_subdir_fn subdir_cb,
3745 size_t origlen, baselen;
3750 if (subdir_nr > 0xff)
3751 BUG("invalid loose object subdirectory: %x", subdir_nr);
3753 origlen = path->len;
3754 strbuf_complete(path, '/');
3755 strbuf_addf(path, "%02x", subdir_nr);
3756 baselen = path->len;
3758 dir = opendir(path->buf);
3760 if (errno != ENOENT)
3761 r = error_errno("unable to open %s", path->buf);
3762 strbuf_setlen(path, origlen);
3766 while ((de = readdir(dir))) {
3767 if (is_dot_or_dotdot(de->d_name))
3770 strbuf_setlen(path, baselen);
3771 strbuf_addf(path, "/%s", de->d_name);
3773 if (strlen(de->d_name) == GIT_SHA1_HEXSZ - 2) {
3774 char hex[GIT_MAX_HEXSZ+1];
3775 struct object_id oid;
3777 xsnprintf(hex, sizeof(hex), "%02x%s",
3778 subdir_nr, de->d_name);
3779 if (!get_oid_hex(hex, &oid)) {
3781 r = obj_cb(&oid, path->buf, data);
3790 r = cruft_cb(de->d_name, path->buf, data);
3797 strbuf_setlen(path, baselen);
3798 if (!r && subdir_cb)
3799 r = subdir_cb(subdir_nr, path->buf, data);
3801 strbuf_setlen(path, origlen);
3806 int for_each_loose_file_in_objdir_buf(struct strbuf *path,
3807 each_loose_object_fn obj_cb,
3808 each_loose_cruft_fn cruft_cb,
3809 each_loose_subdir_fn subdir_cb,
3815 for (i = 0; i < 256; i++) {
3816 r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb,
3825 int for_each_loose_file_in_objdir(const char *path,
3826 each_loose_object_fn obj_cb,
3827 each_loose_cruft_fn cruft_cb,
3828 each_loose_subdir_fn subdir_cb,
3831 struct strbuf buf = STRBUF_INIT;
3834 strbuf_addstr(&buf, path);
3835 r = for_each_loose_file_in_objdir_buf(&buf, obj_cb, cruft_cb,
3837 strbuf_release(&buf);
3842 struct loose_alt_odb_data {
3843 each_loose_object_fn *cb;
3847 static int loose_from_alt_odb(struct alternate_object_database *alt,
3850 struct loose_alt_odb_data *data = vdata;
3851 struct strbuf buf = STRBUF_INIT;
3854 strbuf_addstr(&buf, alt->path);
3855 r = for_each_loose_file_in_objdir_buf(&buf,
3856 data->cb, NULL, NULL,
3858 strbuf_release(&buf);
3862 int for_each_loose_object(each_loose_object_fn cb, void *data, unsigned flags)
3864 struct loose_alt_odb_data alt;
3867 r = for_each_loose_file_in_objdir(get_object_directory(),
3868 cb, NULL, NULL, data);
3872 if (flags & FOR_EACH_OBJECT_LOCAL_ONLY)
3877 return foreach_alt_odb(loose_from_alt_odb, &alt);
3880 static int for_each_object_in_pack(struct packed_git *p, each_packed_object_fn cb, void *data)
3885 for (i = 0; i < p->num_objects; i++) {
3886 struct object_id oid;
3888 if (!nth_packed_object_oid(&oid, p, i))
3889 return error("unable to get sha1 of object %u in %s",
3892 r = cb(&oid, p, i, data);
3899 int for_each_packed_object(each_packed_object_fn cb, void *data, unsigned flags)
3901 struct packed_git *p;
3903 int pack_errors = 0;
3905 prepare_packed_git();
3906 for (p = packed_git; p; p = p->next) {
3907 if ((flags & FOR_EACH_OBJECT_LOCAL_ONLY) && !p->pack_local)
3909 if (open_pack_index(p)) {
3913 r = for_each_object_in_pack(p, cb, data);
3917 return r ? r : pack_errors;
3920 static int check_stream_sha1(git_zstream *stream,
3924 const unsigned char *expected_sha1)
3927 unsigned char real_sha1[GIT_MAX_RAWSZ];
3928 unsigned char buf[4096];
3929 unsigned long total_read;
3933 git_SHA1_Update(&c, hdr, stream->total_out);
3936 * We already read some bytes into hdr, but the ones up to the NUL
3937 * do not count against the object's content size.
3939 total_read = stream->total_out - strlen(hdr) - 1;
3942 * This size comparison must be "<=" to read the final zlib packets;
3943 * see the comment in unpack_sha1_rest for details.
3945 while (total_read <= size &&
3946 (status == Z_OK || status == Z_BUF_ERROR)) {
3947 stream->next_out = buf;
3948 stream->avail_out = sizeof(buf);
3949 if (size - total_read < stream->avail_out)
3950 stream->avail_out = size - total_read;
3951 status = git_inflate(stream, Z_FINISH);
3952 git_SHA1_Update(&c, buf, stream->next_out - buf);
3953 total_read += stream->next_out - buf;
3955 git_inflate_end(stream);
3957 if (status != Z_STREAM_END) {
3958 error("corrupt loose object '%s'", sha1_to_hex(expected_sha1));
3961 if (stream->avail_in) {
3962 error("garbage at end of loose object '%s'",
3963 sha1_to_hex(expected_sha1));
3967 git_SHA1_Final(real_sha1, &c);
3968 if (hashcmp(expected_sha1, real_sha1)) {
3969 error("sha1 mismatch for %s (expected %s)", path,
3970 sha1_to_hex(expected_sha1));
3977 int read_loose_object(const char *path,
3978 const unsigned char *expected_sha1,
3979 enum object_type *type,
3980 unsigned long *size,
3985 unsigned long mapsize;
3991 map = map_sha1_file_1(path, NULL, &mapsize);
3993 error_errno("unable to mmap %s", path);
3997 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) {
3998 error("unable to unpack header of %s", path);
4002 *type = parse_sha1_header(hdr, size);
4004 error("unable to parse header of %s", path);
4005 git_inflate_end(&stream);
4009 if (*type == OBJ_BLOB) {
4010 if (check_stream_sha1(&stream, hdr, *size, path, expected_sha1) < 0)
4013 *contents = unpack_sha1_rest(&stream, hdr, *size, expected_sha1);
4015 error("unable to unpack contents of %s", path);
4016 git_inflate_end(&stream);
4019 if (check_sha1_signature(expected_sha1, *contents,
4020 *size, typename(*type))) {
4021 error("sha1 mismatch for %s (expected %s)", path,
4022 sha1_to_hex(expected_sha1));
4028 ret = 0; /* everything checks out */
4032 munmap(map, mapsize);