4 #include "repository.h"
10 #include "streaming.h"
11 #include "sha1-lookup.h"
15 #include "tree-walk.h"
17 #include "object-store.h"
20 char *odb_pack_name(struct strbuf *buf,
21 const unsigned char *sha1,
25 strbuf_addf(buf, "%s/pack/pack-%s.%s", get_object_directory(),
26 sha1_to_hex(sha1), ext);
30 char *sha1_pack_name(const unsigned char *sha1)
32 static struct strbuf buf = STRBUF_INIT;
33 return odb_pack_name(&buf, sha1, "pack");
36 char *sha1_pack_index_name(const unsigned char *sha1)
38 static struct strbuf buf = STRBUF_INIT;
39 return odb_pack_name(&buf, sha1, "idx");
42 static unsigned int pack_used_ctr;
43 static unsigned int pack_mmap_calls;
44 static unsigned int peak_pack_open_windows;
45 static unsigned int pack_open_windows;
46 static unsigned int pack_open_fds;
47 static unsigned int pack_max_fds;
48 static size_t peak_pack_mapped;
49 static size_t pack_mapped;
51 #define SZ_FMT PRIuMAX
52 static inline uintmax_t sz_fmt(size_t s) { return s; }
54 void pack_report(void)
57 "pack_report: getpagesize() = %10" SZ_FMT "\n"
58 "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
59 "pack_report: core.packedGitLimit = %10" SZ_FMT "\n",
60 sz_fmt(getpagesize()),
61 sz_fmt(packed_git_window_size),
62 sz_fmt(packed_git_limit));
64 "pack_report: pack_used_ctr = %10u\n"
65 "pack_report: pack_mmap_calls = %10u\n"
66 "pack_report: pack_open_windows = %10u / %10u\n"
67 "pack_report: pack_mapped = "
68 "%10" SZ_FMT " / %10" SZ_FMT "\n",
71 pack_open_windows, peak_pack_open_windows,
72 sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped));
76 * Open and mmap the index file at path, perform a couple of
77 * consistency checks, then record its information to p. Return 0 on
80 static int check_packed_git_idx(const char *path, struct packed_git *p)
84 int fd = git_open(path), ret;
86 const unsigned int hashsz = the_hash_algo->rawsz;
94 idx_size = xsize_t(st.st_size);
95 if (idx_size < 4 * 256 + hashsz + hashsz) {
97 return error("index file %s is too small", path);
99 idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
102 ret = load_idx(path, hashsz, idx_map, idx_size, p);
105 munmap(idx_map, idx_size);
110 int load_idx(const char *path, const unsigned int hashsz, void *idx_map,
111 size_t idx_size, struct packed_git *p)
113 struct pack_idx_header *hdr = idx_map;
114 uint32_t version, nr, i, *index;
116 if (idx_size < 4 * 256 + hashsz + hashsz)
117 return error("index file %s is too small", path);
119 return error("empty data");
121 if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) {
122 version = ntohl(hdr->idx_version);
123 if (version < 2 || version > 2)
124 return error("index file %s is version %"PRIu32
125 " and is not supported by this binary"
126 " (try upgrading GIT to a newer version)",
134 index += 2; /* skip index header */
135 for (i = 0; i < 256; i++) {
136 uint32_t n = ntohl(index[i]);
138 return error("non-monotonic index %s", path);
145 * - 256 index entries 4 bytes each
146 * - 24-byte entries * nr (object ID + 4-byte offset)
147 * - hash of the packfile
150 if (idx_size != 4 * 256 + nr * (hashsz + 4) + hashsz + hashsz)
151 return error("wrong index v1 file size in %s", path);
152 } else if (version == 2) {
155 * - 8 bytes of header
156 * - 256 index entries 4 bytes each
157 * - object ID entry * nr
158 * - 4-byte crc entry * nr
159 * - 4-byte offset entry * nr
160 * - hash of the packfile
162 * And after the 4-byte offset table might be a
163 * variable sized table containing 8-byte entries
164 * for offsets larger than 2^31.
166 unsigned long min_size = 8 + 4*256 + nr*(hashsz + 4 + 4) + hashsz + hashsz;
167 unsigned long max_size = min_size;
169 max_size += (nr - 1)*8;
170 if (idx_size < min_size || idx_size > max_size)
171 return error("wrong index v2 file size in %s", path);
172 if (idx_size != min_size &&
174 * make sure we can deal with large pack offsets.
175 * 31-bit signed offset won't be enough, neither
176 * 32-bit unsigned one will be.
178 (sizeof(off_t) <= 4))
179 return error("pack too large for current definition of off_t in %s", path);
182 p->index_version = version;
183 p->index_data = idx_map;
184 p->index_size = idx_size;
189 int open_pack_index(struct packed_git *p)
198 if (!strip_suffix(p->pack_name, ".pack", &len))
199 BUG("pack_name does not end in .pack");
200 idx_name = xstrfmt("%.*s.idx", (int)len, p->pack_name);
201 ret = check_packed_git_idx(idx_name, p);
206 uint32_t get_pack_fanout(struct packed_git *p, uint32_t value)
208 const uint32_t *level1_ofs = p->index_data;
211 if (open_pack_index(p))
213 level1_ofs = p->index_data;
216 if (p->index_version > 1) {
220 return ntohl(level1_ofs[value]);
223 static struct packed_git *alloc_packed_git(int extra)
225 struct packed_git *p = xmalloc(st_add(sizeof(*p), extra));
226 memset(p, 0, sizeof(*p));
231 struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path)
233 const char *path = sha1_pack_name(sha1);
234 size_t alloc = st_add(strlen(path), 1);
235 struct packed_git *p = alloc_packed_git(alloc);
237 memcpy(p->pack_name, path, alloc); /* includes NUL */
238 hashcpy(p->sha1, sha1);
239 if (check_packed_git_idx(idx_path, p)) {
247 static void scan_windows(struct packed_git *p,
248 struct packed_git **lru_p,
249 struct pack_window **lru_w,
250 struct pack_window **lru_l)
252 struct pack_window *w, *w_l;
254 for (w_l = NULL, w = p->windows; w; w = w->next) {
256 if (!*lru_w || w->last_used < (*lru_w)->last_used) {
266 static int unuse_one_window(struct packed_git *current)
268 struct packed_git *p, *lru_p = NULL;
269 struct pack_window *lru_w = NULL, *lru_l = NULL;
272 scan_windows(current, &lru_p, &lru_w, &lru_l);
273 for (p = the_repository->objects->packed_git; p; p = p->next)
274 scan_windows(p, &lru_p, &lru_w, &lru_l);
276 munmap(lru_w->base, lru_w->len);
277 pack_mapped -= lru_w->len;
279 lru_l->next = lru_w->next;
281 lru_p->windows = lru_w->next;
289 void release_pack_memory(size_t need)
291 size_t cur = pack_mapped;
292 while (need >= (cur - pack_mapped) && unuse_one_window(NULL))
296 void close_pack_windows(struct packed_git *p)
299 struct pack_window *w = p->windows;
302 die("pack '%s' still has open windows to it",
304 munmap(w->base, w->len);
305 pack_mapped -= w->len;
307 p->windows = w->next;
312 static int close_pack_fd(struct packed_git *p)
324 void close_pack_index(struct packed_git *p)
327 munmap((void *)p->index_data, p->index_size);
328 p->index_data = NULL;
332 void close_pack(struct packed_git *p)
334 close_pack_windows(p);
339 void close_all_packs(struct raw_object_store *o)
341 struct packed_git *p;
343 for (p = o->packed_git; p; p = p->next)
345 BUG("want to close pack marked 'do-not-close'");
349 if (o->multi_pack_index) {
350 close_midx(o->multi_pack_index);
351 o->multi_pack_index = NULL;
356 * The LRU pack is the one with the oldest MRU window, preferring packs
357 * with no used windows, or the oldest mtime if it has no windows allocated.
359 static void find_lru_pack(struct packed_git *p, struct packed_git **lru_p, struct pack_window **mru_w, int *accept_windows_inuse)
361 struct pack_window *w, *this_mru_w;
362 int has_windows_inuse = 0;
365 * Reject this pack if it has windows and the previously selected
366 * one does not. If this pack does not have windows, reject
367 * it if the pack file is newer than the previously selected one.
369 if (*lru_p && !*mru_w && (p->windows || p->mtime > (*lru_p)->mtime))
372 for (w = this_mru_w = p->windows; w; w = w->next) {
374 * Reject this pack if any of its windows are in use,
375 * but the previously selected pack did not have any
376 * inuse windows. Otherwise, record that this pack
377 * has windows in use.
380 if (*accept_windows_inuse)
381 has_windows_inuse = 1;
386 if (w->last_used > this_mru_w->last_used)
390 * Reject this pack if it has windows that have been
391 * used more recently than the previously selected pack.
392 * If the previously selected pack had windows inuse and
393 * we have not encountered a window in this pack that is
394 * inuse, skip this check since we prefer a pack with no
395 * inuse windows to one that has inuse windows.
397 if (*mru_w && *accept_windows_inuse == has_windows_inuse &&
398 this_mru_w->last_used > (*mru_w)->last_used)
407 *accept_windows_inuse = has_windows_inuse;
410 static int close_one_pack(void)
412 struct packed_git *p, *lru_p = NULL;
413 struct pack_window *mru_w = NULL;
414 int accept_windows_inuse = 1;
416 for (p = the_repository->objects->packed_git; p; p = p->next) {
417 if (p->pack_fd == -1)
419 find_lru_pack(p, &lru_p, &mru_w, &accept_windows_inuse);
423 return close_pack_fd(lru_p);
428 static unsigned int get_max_fd_limit(void)
434 if (!getrlimit(RLIMIT_NOFILE, &lim))
441 long open_max = sysconf(_SC_OPEN_MAX);
445 * Otherwise, we got -1 for one of the two
448 * (1) sysconf() did not understand _SC_OPEN_MAX
449 * and signaled an error with -1; or
450 * (2) sysconf() said there is no limit.
452 * We _could_ clear errno before calling sysconf() to
453 * tell these two cases apart and return a huge number
454 * in the latter case to let the caller cap it to a
455 * value that is not so selfish, but letting the
456 * fallback OPEN_MAX codepath take care of these cases
465 return 1; /* see the caller ;-) */
470 * Do not call this directly as this leaks p->pack_fd on error return;
471 * call open_packed_git() instead.
473 static int open_packed_git_1(struct packed_git *p)
476 struct pack_header hdr;
477 unsigned char hash[GIT_MAX_RAWSZ];
478 unsigned char *idx_hash;
481 const unsigned hashsz = the_hash_algo->rawsz;
483 if (!p->index_data) {
484 struct multi_pack_index *m;
485 const char *pack_name = strrchr(p->pack_name, '/');
487 for (m = the_repository->objects->multi_pack_index;
489 if (midx_contains_pack(m, pack_name))
493 if (!m && open_pack_index(p))
494 return error("packfile %s index unavailable", p->pack_name);
498 unsigned int max_fds = get_max_fd_limit();
500 /* Save 3 for stdin/stdout/stderr, 22 for work */
502 pack_max_fds = max_fds - 25;
507 while (pack_max_fds <= pack_open_fds && close_one_pack())
510 p->pack_fd = git_open(p->pack_name);
511 if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
515 /* If we created the struct before we had the pack we lack size. */
517 if (!S_ISREG(st.st_mode))
518 return error("packfile %s not a regular file", p->pack_name);
519 p->pack_size = st.st_size;
520 } else if (p->pack_size != st.st_size)
521 return error("packfile %s size changed", p->pack_name);
523 /* We leave these file descriptors open with sliding mmap;
524 * there is no point keeping them open across exec(), though.
526 fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
528 return error("cannot determine file descriptor flags");
529 fd_flag |= FD_CLOEXEC;
530 if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
531 return error("cannot set FD_CLOEXEC");
533 /* Verify we recognize this pack file format. */
534 read_result = read_in_full(p->pack_fd, &hdr, sizeof(hdr));
536 return error_errno("error reading from %s", p->pack_name);
537 if (read_result != sizeof(hdr))
538 return error("file %s is far too short to be a packfile", p->pack_name);
539 if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
540 return error("file %s is not a GIT packfile", p->pack_name);
541 if (!pack_version_ok(hdr.hdr_version))
542 return error("packfile %s is version %"PRIu32" and not"
543 " supported (try upgrading GIT to a newer version)",
544 p->pack_name, ntohl(hdr.hdr_version));
546 /* Skip index checking if in multi-pack-index */
550 /* Verify the pack matches its index. */
551 if (p->num_objects != ntohl(hdr.hdr_entries))
552 return error("packfile %s claims to have %"PRIu32" objects"
553 " while index indicates %"PRIu32" objects",
554 p->pack_name, ntohl(hdr.hdr_entries),
556 if (lseek(p->pack_fd, p->pack_size - hashsz, SEEK_SET) == -1)
557 return error("end of packfile %s is unavailable", p->pack_name);
558 read_result = read_in_full(p->pack_fd, hash, hashsz);
560 return error_errno("error reading from %s", p->pack_name);
561 if (read_result != hashsz)
562 return error("packfile %s signature is unavailable", p->pack_name);
563 idx_hash = ((unsigned char *)p->index_data) + p->index_size - hashsz * 2;
564 if (!hasheq(hash, idx_hash))
565 return error("packfile %s does not match index", p->pack_name);
569 static int open_packed_git(struct packed_git *p)
571 if (!open_packed_git_1(p))
577 static int in_window(struct pack_window *win, off_t offset)
579 /* We must promise at least one full hash after the
580 * offset is available from this window, otherwise the offset
581 * is not actually in this window and a different window (which
582 * has that one hash excess) must be used. This is to support
583 * the object header and delta base parsing routines below.
585 off_t win_off = win->offset;
586 return win_off <= offset
587 && (offset + the_hash_algo->rawsz) <= (win_off + win->len);
590 unsigned char *use_pack(struct packed_git *p,
591 struct pack_window **w_cursor,
595 struct pack_window *win = *w_cursor;
597 /* Since packfiles end in a hash of their content and it's
598 * pointless to ask for an offset into the middle of that
599 * hash, and the in_window function above wouldn't match
600 * don't allow an offset too close to the end of the file.
602 if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p))
603 die("packfile %s cannot be accessed", p->pack_name);
604 if (offset > (p->pack_size - the_hash_algo->rawsz))
605 die("offset beyond end of packfile (truncated pack?)");
607 die(_("offset before end of packfile (broken .idx?)"));
609 if (!win || !in_window(win, offset)) {
612 for (win = p->windows; win; win = win->next) {
613 if (in_window(win, offset))
617 size_t window_align = packed_git_window_size / 2;
620 if (p->pack_fd == -1 && open_packed_git(p))
621 die("packfile %s cannot be accessed", p->pack_name);
623 win = xcalloc(1, sizeof(*win));
624 win->offset = (offset / window_align) * window_align;
625 len = p->pack_size - win->offset;
626 if (len > packed_git_window_size)
627 len = packed_git_window_size;
628 win->len = (size_t)len;
629 pack_mapped += win->len;
630 while (packed_git_limit < pack_mapped
631 && unuse_one_window(p))
633 win->base = xmmap(NULL, win->len,
634 PROT_READ, MAP_PRIVATE,
635 p->pack_fd, win->offset);
636 if (win->base == MAP_FAILED)
637 die_errno("packfile %s cannot be mapped",
639 if (!win->offset && win->len == p->pack_size
644 if (pack_mapped > peak_pack_mapped)
645 peak_pack_mapped = pack_mapped;
646 if (pack_open_windows > peak_pack_open_windows)
647 peak_pack_open_windows = pack_open_windows;
648 win->next = p->windows;
652 if (win != *w_cursor) {
653 win->last_used = pack_used_ctr++;
657 offset -= win->offset;
659 *left = win->len - xsize_t(offset);
660 return win->base + offset;
663 void unuse_pack(struct pack_window **w_cursor)
665 struct pack_window *w = *w_cursor;
672 static void try_to_free_pack_memory(size_t size)
674 release_pack_memory(size);
677 struct packed_git *add_packed_git(const char *path, size_t path_len, int local)
679 static int have_set_try_to_free_routine;
682 struct packed_git *p;
684 if (!have_set_try_to_free_routine) {
685 have_set_try_to_free_routine = 1;
686 set_try_to_free_routine(try_to_free_pack_memory);
690 * Make sure a corresponding .pack file exists and that
691 * the index looks sane.
693 if (!strip_suffix_mem(path, &path_len, ".idx"))
697 * ".promisor" is long enough to hold any suffix we're adding (and
698 * the use xsnprintf double-checks that)
700 alloc = st_add3(path_len, strlen(".promisor"), 1);
701 p = alloc_packed_git(alloc);
702 memcpy(p->pack_name, path, path_len);
704 xsnprintf(p->pack_name + path_len, alloc - path_len, ".keep");
705 if (!access(p->pack_name, F_OK))
708 xsnprintf(p->pack_name + path_len, alloc - path_len, ".promisor");
709 if (!access(p->pack_name, F_OK))
710 p->pack_promisor = 1;
712 xsnprintf(p->pack_name + path_len, alloc - path_len, ".pack");
713 if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) {
718 /* ok, it looks sane as far as we can check without
719 * actually mapping the pack file.
721 p->pack_size = st.st_size;
722 p->pack_local = local;
723 p->mtime = st.st_mtime;
724 if (path_len < the_hash_algo->hexsz ||
725 get_sha1_hex(path + path_len - the_hash_algo->hexsz, p->sha1))
730 void install_packed_git(struct repository *r, struct packed_git *pack)
732 if (pack->pack_fd != -1)
735 pack->next = r->objects->packed_git;
736 r->objects->packed_git = pack;
739 void (*report_garbage)(unsigned seen_bits, const char *path);
741 static void report_helper(const struct string_list *list,
742 int seen_bits, int first, int last)
744 if (seen_bits == (PACKDIR_FILE_PACK|PACKDIR_FILE_IDX))
747 for (; first < last; first++)
748 report_garbage(seen_bits, list->items[first].string);
751 static void report_pack_garbage(struct string_list *list)
753 int i, baselen = -1, first = 0, seen_bits = 0;
758 string_list_sort(list);
760 for (i = 0; i < list->nr; i++) {
761 const char *path = list->items[i].string;
763 strncmp(path, list->items[first].string, baselen)) {
764 report_helper(list, seen_bits, first, i);
769 const char *dot = strrchr(path, '.');
771 report_garbage(PACKDIR_FILE_GARBAGE, path);
774 baselen = dot - path + 1;
777 if (!strcmp(path + baselen, "pack"))
779 else if (!strcmp(path + baselen, "idx"))
782 report_helper(list, seen_bits, first, list->nr);
785 void for_each_file_in_pack_dir(const char *objdir,
786 each_file_in_pack_dir_fn fn,
789 struct strbuf path = STRBUF_INIT;
794 strbuf_addstr(&path, objdir);
795 strbuf_addstr(&path, "/pack");
796 dir = opendir(path.buf);
799 error_errno("unable to open object pack directory: %s",
801 strbuf_release(&path);
804 strbuf_addch(&path, '/');
805 dirnamelen = path.len;
806 while ((de = readdir(dir)) != NULL) {
807 if (is_dot_or_dotdot(de->d_name))
810 strbuf_setlen(&path, dirnamelen);
811 strbuf_addstr(&path, de->d_name);
813 fn(path.buf, path.len, de->d_name, data);
817 strbuf_release(&path);
820 struct prepare_pack_data {
821 struct repository *r;
822 struct string_list *garbage;
824 struct multi_pack_index *m;
827 static void prepare_pack(const char *full_name, size_t full_name_len,
828 const char *file_name, void *_data)
830 struct prepare_pack_data *data = (struct prepare_pack_data *)_data;
831 struct packed_git *p;
832 size_t base_len = full_name_len;
834 if (strip_suffix_mem(full_name, &base_len, ".idx") &&
835 !(data->m && midx_contains_pack(data->m, file_name))) {
836 /* Don't reopen a pack we already have. */
837 for (p = data->r->objects->packed_git; p; p = p->next) {
839 if (strip_suffix(p->pack_name, ".pack", &len) &&
841 !memcmp(p->pack_name, full_name, len))
846 p = add_packed_git(full_name, full_name_len, data->local);
848 install_packed_git(data->r, p);
855 if (!strcmp(file_name, "multi-pack-index"))
857 if (ends_with(file_name, ".idx") ||
858 ends_with(file_name, ".pack") ||
859 ends_with(file_name, ".bitmap") ||
860 ends_with(file_name, ".keep") ||
861 ends_with(file_name, ".promisor"))
862 string_list_append(data->garbage, full_name);
864 report_garbage(PACKDIR_FILE_GARBAGE, full_name);
867 static void prepare_packed_git_one(struct repository *r, char *objdir, int local)
869 struct prepare_pack_data data;
870 struct string_list garbage = STRING_LIST_INIT_DUP;
872 data.m = r->objects->multi_pack_index;
874 /* look for the multi-pack-index for this object directory */
875 while (data.m && strcmp(data.m->object_dir, objdir))
876 data.m = data.m->next;
879 data.garbage = &garbage;
882 for_each_file_in_pack_dir(objdir, prepare_pack, &data);
884 report_pack_garbage(data.garbage);
885 string_list_clear(data.garbage, 0);
888 static void prepare_packed_git(struct repository *r);
890 * Give a fast, rough count of the number of objects in the repository. This
891 * ignores loose objects completely. If you have a lot of them, then either
892 * you should repack because your performance will be awful, or they are
893 * all unreachable objects about to be pruned, in which case they're not really
894 * interesting as a measure of repo size in the first place.
896 unsigned long approximate_object_count(void)
898 if (!the_repository->objects->approximate_object_count_valid) {
900 struct multi_pack_index *m;
901 struct packed_git *p;
903 prepare_packed_git(the_repository);
905 for (m = get_multi_pack_index(the_repository); m; m = m->next)
906 count += m->num_objects;
907 for (p = the_repository->objects->packed_git; p; p = p->next) {
908 if (open_pack_index(p))
910 count += p->num_objects;
912 the_repository->objects->approximate_object_count = count;
914 return the_repository->objects->approximate_object_count;
917 static void *get_next_packed_git(const void *p)
919 return ((const struct packed_git *)p)->next;
922 static void set_next_packed_git(void *p, void *next)
924 ((struct packed_git *)p)->next = next;
927 static int sort_pack(const void *a_, const void *b_)
929 const struct packed_git *a = a_;
930 const struct packed_git *b = b_;
934 * Local packs tend to contain objects specific to our
935 * variant of the project than remote ones. In addition,
936 * remote ones could be on a network mounted filesystem.
937 * Favor local ones for these reasons.
939 st = a->pack_local - b->pack_local;
944 * Younger packs tend to contain more recent objects,
945 * and more recent objects tend to get accessed more
948 if (a->mtime < b->mtime)
950 else if (a->mtime == b->mtime)
955 static void rearrange_packed_git(struct repository *r)
957 r->objects->packed_git = llist_mergesort(
958 r->objects->packed_git, get_next_packed_git,
959 set_next_packed_git, sort_pack);
962 static void prepare_packed_git_mru(struct repository *r)
964 struct packed_git *p;
966 INIT_LIST_HEAD(&r->objects->packed_git_mru);
968 for (p = r->objects->packed_git; p; p = p->next)
969 list_add_tail(&p->mru, &r->objects->packed_git_mru);
972 static void prepare_packed_git(struct repository *r)
974 struct object_directory *odb;
976 if (r->objects->packed_git_initialized)
980 for (odb = r->objects->odb; odb; odb = odb->next) {
981 int local = (odb == r->objects->odb);
982 prepare_multi_pack_index_one(r, odb->path, local);
983 prepare_packed_git_one(r, odb->path, local);
985 rearrange_packed_git(r);
987 r->objects->all_packs = NULL;
989 prepare_packed_git_mru(r);
990 r->objects->packed_git_initialized = 1;
993 void reprepare_packed_git(struct repository *r)
995 struct object_directory *odb;
997 for (odb = r->objects->odb; odb; odb = odb->next)
998 odb_clear_loose_cache(odb);
1000 r->objects->approximate_object_count_valid = 0;
1001 r->objects->packed_git_initialized = 0;
1002 prepare_packed_git(r);
1005 struct packed_git *get_packed_git(struct repository *r)
1007 prepare_packed_git(r);
1008 return r->objects->packed_git;
1011 struct multi_pack_index *get_multi_pack_index(struct repository *r)
1013 prepare_packed_git(r);
1014 return r->objects->multi_pack_index;
1017 struct packed_git *get_all_packs(struct repository *r)
1019 prepare_packed_git(r);
1021 if (!r->objects->all_packs) {
1022 struct packed_git *p = r->objects->packed_git;
1023 struct multi_pack_index *m;
1025 for (m = r->objects->multi_pack_index; m; m = m->next) {
1027 for (i = 0; i < m->num_packs; i++) {
1028 if (!prepare_midx_pack(m, i)) {
1029 m->packs[i]->next = p;
1035 r->objects->all_packs = p;
1038 return r->objects->all_packs;
1041 struct list_head *get_packed_git_mru(struct repository *r)
1043 prepare_packed_git(r);
1044 return &r->objects->packed_git_mru;
1047 unsigned long unpack_object_header_buffer(const unsigned char *buf,
1048 unsigned long len, enum object_type *type, unsigned long *sizep)
1051 unsigned long size, c;
1052 unsigned long used = 0;
1055 *type = (c >> 4) & 7;
1059 if (len <= used || bitsizeof(long) <= shift) {
1060 error("bad object header");
1065 size += (c & 0x7f) << shift;
1072 unsigned long get_size_from_delta(struct packed_git *p,
1073 struct pack_window **w_curs,
1076 const unsigned char *data;
1077 unsigned char delta_head[20], *in;
1081 memset(&stream, 0, sizeof(stream));
1082 stream.next_out = delta_head;
1083 stream.avail_out = sizeof(delta_head);
1085 git_inflate_init(&stream);
1087 in = use_pack(p, w_curs, curpos, &stream.avail_in);
1088 stream.next_in = in;
1089 st = git_inflate(&stream, Z_FINISH);
1090 curpos += stream.next_in - in;
1091 } while ((st == Z_OK || st == Z_BUF_ERROR) &&
1092 stream.total_out < sizeof(delta_head));
1093 git_inflate_end(&stream);
1094 if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) {
1095 error("delta data unpack-initial failed");
1099 /* Examine the initial part of the delta to figure out
1104 /* ignore base size */
1105 get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
1107 /* Read the result size */
1108 return get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
1111 int unpack_object_header(struct packed_git *p,
1112 struct pack_window **w_curs,
1114 unsigned long *sizep)
1116 unsigned char *base;
1119 enum object_type type;
1121 /* use_pack() assures us we have [base, base + 20) available
1122 * as a range that we can look at. (Its actually the hash
1123 * size that is assured.) With our object header encoding
1124 * the maximum deflated object size is 2^137, which is just
1125 * insane, so we know won't exceed what we have been given.
1127 base = use_pack(p, w_curs, *curpos, &left);
1128 used = unpack_object_header_buffer(base, left, &type, sizep);
1137 void mark_bad_packed_object(struct packed_git *p, const unsigned char *sha1)
1140 const unsigned hashsz = the_hash_algo->rawsz;
1141 for (i = 0; i < p->num_bad_objects; i++)
1142 if (hasheq(sha1, p->bad_object_sha1 + hashsz * i))
1144 p->bad_object_sha1 = xrealloc(p->bad_object_sha1,
1145 st_mult(GIT_MAX_RAWSZ,
1146 st_add(p->num_bad_objects, 1)));
1147 hashcpy(p->bad_object_sha1 + hashsz * p->num_bad_objects, sha1);
1148 p->num_bad_objects++;
1151 const struct packed_git *has_packed_and_bad(const unsigned char *sha1)
1153 struct packed_git *p;
1156 for (p = the_repository->objects->packed_git; p; p = p->next)
1157 for (i = 0; i < p->num_bad_objects; i++)
1159 p->bad_object_sha1 + the_hash_algo->rawsz * i))
1164 static off_t get_delta_base(struct packed_git *p,
1165 struct pack_window **w_curs,
1167 enum object_type type,
1168 off_t delta_obj_offset)
1170 unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL);
1173 /* use_pack() assured us we have [base_info, base_info + 20)
1174 * as a range that we can look at without walking off the
1175 * end of the mapped window. Its actually the hash size
1176 * that is assured. An OFS_DELTA longer than the hash size
1177 * is stupid, as then a REF_DELTA would be smaller to store.
1179 if (type == OBJ_OFS_DELTA) {
1181 unsigned char c = base_info[used++];
1182 base_offset = c & 127;
1185 if (!base_offset || MSB(base_offset, 7))
1186 return 0; /* overflow */
1187 c = base_info[used++];
1188 base_offset = (base_offset << 7) + (c & 127);
1190 base_offset = delta_obj_offset - base_offset;
1191 if (base_offset <= 0 || base_offset >= delta_obj_offset)
1192 return 0; /* out of bound */
1194 } else if (type == OBJ_REF_DELTA) {
1195 /* The base entry _must_ be in the same pack */
1196 base_offset = find_pack_entry_one(base_info, p);
1197 *curpos += the_hash_algo->rawsz;
1199 die("I am totally screwed");
1204 * Like get_delta_base above, but we return the sha1 instead of the pack
1205 * offset. This means it is cheaper for REF deltas (we do not have to do
1206 * the final object lookup), but more expensive for OFS deltas (we
1207 * have to load the revidx to convert the offset back into a sha1).
1209 static const unsigned char *get_delta_base_sha1(struct packed_git *p,
1210 struct pack_window **w_curs,
1212 enum object_type type,
1213 off_t delta_obj_offset)
1215 if (type == OBJ_REF_DELTA) {
1216 unsigned char *base = use_pack(p, w_curs, curpos, NULL);
1218 } else if (type == OBJ_OFS_DELTA) {
1219 struct revindex_entry *revidx;
1220 off_t base_offset = get_delta_base(p, w_curs, &curpos,
1221 type, delta_obj_offset);
1226 revidx = find_pack_revindex(p, base_offset);
1230 return nth_packed_object_sha1(p, revidx->nr);
1235 static int retry_bad_packed_offset(struct repository *r,
1236 struct packed_git *p,
1240 struct revindex_entry *revidx;
1241 struct object_id oid;
1242 revidx = find_pack_revindex(p, obj_offset);
1245 nth_packed_object_oid(&oid, p, revidx->nr);
1246 mark_bad_packed_object(p, oid.hash);
1247 type = oid_object_info(r, &oid, NULL);
1248 if (type <= OBJ_NONE)
1253 #define POI_STACK_PREALLOC 64
1255 static enum object_type packed_to_object_type(struct repository *r,
1256 struct packed_git *p,
1258 enum object_type type,
1259 struct pack_window **w_curs,
1262 off_t small_poi_stack[POI_STACK_PREALLOC];
1263 off_t *poi_stack = small_poi_stack;
1264 int poi_stack_nr = 0, poi_stack_alloc = POI_STACK_PREALLOC;
1266 while (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
1269 /* Push the object we're going to leave behind */
1270 if (poi_stack_nr >= poi_stack_alloc && poi_stack == small_poi_stack) {
1271 poi_stack_alloc = alloc_nr(poi_stack_nr);
1272 ALLOC_ARRAY(poi_stack, poi_stack_alloc);
1273 memcpy(poi_stack, small_poi_stack, sizeof(off_t)*poi_stack_nr);
1275 ALLOC_GROW(poi_stack, poi_stack_nr+1, poi_stack_alloc);
1277 poi_stack[poi_stack_nr++] = obj_offset;
1278 /* If parsing the base offset fails, just unwind */
1279 base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset);
1282 curpos = obj_offset = base_offset;
1283 type = unpack_object_header(p, w_curs, &curpos, &size);
1284 if (type <= OBJ_NONE) {
1285 /* If getting the base itself fails, we first
1286 * retry the base, otherwise unwind */
1287 type = retry_bad_packed_offset(r, p, base_offset);
1288 if (type > OBJ_NONE)
1302 error("unknown object type %i at offset %"PRIuMAX" in %s",
1303 type, (uintmax_t)obj_offset, p->pack_name);
1308 if (poi_stack != small_poi_stack)
1313 while (poi_stack_nr) {
1314 obj_offset = poi_stack[--poi_stack_nr];
1315 type = retry_bad_packed_offset(r, p, obj_offset);
1316 if (type > OBJ_NONE)
1323 static struct hashmap delta_base_cache;
1324 static size_t delta_base_cached;
1326 static LIST_HEAD(delta_base_cache_lru);
1328 struct delta_base_cache_key {
1329 struct packed_git *p;
1333 struct delta_base_cache_entry {
1334 struct hashmap hash;
1335 struct delta_base_cache_key key;
1336 struct list_head lru;
1339 enum object_type type;
1342 static unsigned int pack_entry_hash(struct packed_git *p, off_t base_offset)
1346 hash = (unsigned int)(intptr_t)p + (unsigned int)base_offset;
1347 hash += (hash >> 8) + (hash >> 16);
1351 static struct delta_base_cache_entry *
1352 get_delta_base_cache_entry(struct packed_git *p, off_t base_offset)
1354 struct hashmap_entry entry;
1355 struct delta_base_cache_key key;
1357 if (!delta_base_cache.cmpfn)
1360 hashmap_entry_init(&entry, pack_entry_hash(p, base_offset));
1362 key.base_offset = base_offset;
1363 return hashmap_get(&delta_base_cache, &entry, &key);
1366 static int delta_base_cache_key_eq(const struct delta_base_cache_key *a,
1367 const struct delta_base_cache_key *b)
1369 return a->p == b->p && a->base_offset == b->base_offset;
1372 static int delta_base_cache_hash_cmp(const void *unused_cmp_data,
1373 const void *va, const void *vb,
1376 const struct delta_base_cache_entry *a = va, *b = vb;
1377 const struct delta_base_cache_key *key = vkey;
1379 return !delta_base_cache_key_eq(&a->key, key);
1381 return !delta_base_cache_key_eq(&a->key, &b->key);
1384 static int in_delta_base_cache(struct packed_git *p, off_t base_offset)
1386 return !!get_delta_base_cache_entry(p, base_offset);
1390 * Remove the entry from the cache, but do _not_ free the associated
1391 * entry data. The caller takes ownership of the "data" buffer, and
1392 * should copy out any fields it wants before detaching.
1394 static void detach_delta_base_cache_entry(struct delta_base_cache_entry *ent)
1396 hashmap_remove(&delta_base_cache, ent, &ent->key);
1397 list_del(&ent->lru);
1398 delta_base_cached -= ent->size;
1402 static void *cache_or_unpack_entry(struct repository *r, struct packed_git *p,
1403 off_t base_offset, unsigned long *base_size,
1404 enum object_type *type)
1406 struct delta_base_cache_entry *ent;
1408 ent = get_delta_base_cache_entry(p, base_offset);
1410 return unpack_entry(r, p, base_offset, type, base_size);
1415 *base_size = ent->size;
1416 return xmemdupz(ent->data, ent->size);
1419 static inline void release_delta_base_cache(struct delta_base_cache_entry *ent)
1422 detach_delta_base_cache_entry(ent);
1425 void clear_delta_base_cache(void)
1427 struct list_head *lru, *tmp;
1428 list_for_each_safe(lru, tmp, &delta_base_cache_lru) {
1429 struct delta_base_cache_entry *entry =
1430 list_entry(lru, struct delta_base_cache_entry, lru);
1431 release_delta_base_cache(entry);
1435 static void add_delta_base_cache(struct packed_git *p, off_t base_offset,
1436 void *base, unsigned long base_size, enum object_type type)
1438 struct delta_base_cache_entry *ent = xmalloc(sizeof(*ent));
1439 struct list_head *lru, *tmp;
1441 delta_base_cached += base_size;
1443 list_for_each_safe(lru, tmp, &delta_base_cache_lru) {
1444 struct delta_base_cache_entry *f =
1445 list_entry(lru, struct delta_base_cache_entry, lru);
1446 if (delta_base_cached <= delta_base_cache_limit)
1448 release_delta_base_cache(f);
1452 ent->key.base_offset = base_offset;
1455 ent->size = base_size;
1456 list_add_tail(&ent->lru, &delta_base_cache_lru);
1458 if (!delta_base_cache.cmpfn)
1459 hashmap_init(&delta_base_cache, delta_base_cache_hash_cmp, NULL, 0);
1460 hashmap_entry_init(ent, pack_entry_hash(p, base_offset));
1461 hashmap_add(&delta_base_cache, ent);
1464 int packed_object_info(struct repository *r, struct packed_git *p,
1465 off_t obj_offset, struct object_info *oi)
1467 struct pack_window *w_curs = NULL;
1469 off_t curpos = obj_offset;
1470 enum object_type type;
1473 * We always get the representation type, but only convert it to
1474 * a "real" type later if the caller is interested.
1477 *oi->contentp = cache_or_unpack_entry(r, p, obj_offset, oi->sizep,
1482 type = unpack_object_header(p, &w_curs, &curpos, &size);
1485 if (!oi->contentp && oi->sizep) {
1486 if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
1487 off_t tmp_pos = curpos;
1488 off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos,
1494 *oi->sizep = get_size_from_delta(p, &w_curs, tmp_pos);
1495 if (*oi->sizep == 0) {
1504 if (oi->disk_sizep) {
1505 struct revindex_entry *revidx = find_pack_revindex(p, obj_offset);
1506 *oi->disk_sizep = revidx[1].offset - obj_offset;
1509 if (oi->typep || oi->type_name) {
1510 enum object_type ptot;
1511 ptot = packed_to_object_type(r, p, obj_offset,
1512 type, &w_curs, curpos);
1515 if (oi->type_name) {
1516 const char *tn = type_name(ptot);
1518 strbuf_addstr(oi->type_name, tn);
1526 if (oi->delta_base_sha1) {
1527 if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
1528 const unsigned char *base;
1530 base = get_delta_base_sha1(p, &w_curs, curpos,
1537 hashcpy(oi->delta_base_sha1, base);
1539 hashclr(oi->delta_base_sha1);
1542 oi->whence = in_delta_base_cache(p, obj_offset) ? OI_DBCACHED :
1546 unuse_pack(&w_curs);
1550 static void *unpack_compressed_entry(struct packed_git *p,
1551 struct pack_window **w_curs,
1557 unsigned char *buffer, *in;
1559 buffer = xmallocz_gently(size);
1562 memset(&stream, 0, sizeof(stream));
1563 stream.next_out = buffer;
1564 stream.avail_out = size + 1;
1566 git_inflate_init(&stream);
1568 in = use_pack(p, w_curs, curpos, &stream.avail_in);
1569 stream.next_in = in;
1570 st = git_inflate(&stream, Z_FINISH);
1571 if (!stream.avail_out)
1572 break; /* the payload is larger than it should be */
1573 curpos += stream.next_in - in;
1574 } while (st == Z_OK || st == Z_BUF_ERROR);
1575 git_inflate_end(&stream);
1576 if ((st != Z_STREAM_END) || stream.total_out != size) {
1581 /* versions of zlib can clobber unconsumed portion of outbuf */
1582 buffer[size] = '\0';
1587 static void write_pack_access_log(struct packed_git *p, off_t obj_offset)
1589 static struct trace_key pack_access = TRACE_KEY_INIT(PACK_ACCESS);
1590 trace_printf_key(&pack_access, "%s %"PRIuMAX"\n",
1591 p->pack_name, (uintmax_t)obj_offset);
1594 int do_check_packed_object_crc;
1596 #define UNPACK_ENTRY_STACK_PREALLOC 64
1597 struct unpack_entry_stack_ent {
1603 static void *read_object(struct repository *r,
1604 const struct object_id *oid,
1605 enum object_type *type,
1606 unsigned long *size)
1608 struct object_info oi = OBJECT_INFO_INIT;
1612 oi.contentp = &content;
1614 if (oid_object_info_extended(r, oid, &oi, 0) < 0)
1619 void *unpack_entry(struct repository *r, struct packed_git *p, off_t obj_offset,
1620 enum object_type *final_type, unsigned long *final_size)
1622 struct pack_window *w_curs = NULL;
1623 off_t curpos = obj_offset;
1626 enum object_type type;
1627 struct unpack_entry_stack_ent small_delta_stack[UNPACK_ENTRY_STACK_PREALLOC];
1628 struct unpack_entry_stack_ent *delta_stack = small_delta_stack;
1629 int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC;
1630 int base_from_cache = 0;
1632 write_pack_access_log(p, obj_offset);
1634 /* PHASE 1: drill down to the innermost base object */
1638 struct delta_base_cache_entry *ent;
1640 ent = get_delta_base_cache_entry(p, curpos);
1645 detach_delta_base_cache_entry(ent);
1646 base_from_cache = 1;
1650 if (do_check_packed_object_crc && p->index_version > 1) {
1651 struct revindex_entry *revidx = find_pack_revindex(p, obj_offset);
1652 off_t len = revidx[1].offset - obj_offset;
1653 if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) {
1654 struct object_id oid;
1655 nth_packed_object_oid(&oid, p, revidx->nr);
1656 error("bad packed object CRC for %s",
1658 mark_bad_packed_object(p, oid.hash);
1664 type = unpack_object_header(p, &w_curs, &curpos, &size);
1665 if (type != OBJ_OFS_DELTA && type != OBJ_REF_DELTA)
1668 base_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset);
1670 error("failed to validate delta base reference "
1671 "at offset %"PRIuMAX" from %s",
1672 (uintmax_t)curpos, p->pack_name);
1673 /* bail to phase 2, in hopes of recovery */
1678 /* push object, proceed to base */
1679 if (delta_stack_nr >= delta_stack_alloc
1680 && delta_stack == small_delta_stack) {
1681 delta_stack_alloc = alloc_nr(delta_stack_nr);
1682 ALLOC_ARRAY(delta_stack, delta_stack_alloc);
1683 memcpy(delta_stack, small_delta_stack,
1684 sizeof(*delta_stack)*delta_stack_nr);
1686 ALLOC_GROW(delta_stack, delta_stack_nr+1, delta_stack_alloc);
1688 i = delta_stack_nr++;
1689 delta_stack[i].obj_offset = obj_offset;
1690 delta_stack[i].curpos = curpos;
1691 delta_stack[i].size = size;
1693 curpos = obj_offset = base_offset;
1696 /* PHASE 2: handle the base */
1701 BUG("unpack_entry: left loop at a valid delta");
1707 if (!base_from_cache)
1708 data = unpack_compressed_entry(p, &w_curs, curpos, size);
1712 error("unknown object type %i at offset %"PRIuMAX" in %s",
1713 type, (uintmax_t)obj_offset, p->pack_name);
1716 /* PHASE 3: apply deltas in order */
1719 * 'data' holds the base data, or NULL if there was corruption
1721 while (delta_stack_nr) {
1724 void *external_base = NULL;
1725 unsigned long delta_size, base_size = size;
1731 add_delta_base_cache(p, obj_offset, base, base_size, type);
1735 * We're probably in deep shit, but let's try to fetch
1736 * the required base anyway from another pack or loose.
1737 * This is costly but should happen only in the presence
1738 * of a corrupted pack, and is better than failing outright.
1740 struct revindex_entry *revidx;
1741 struct object_id base_oid;
1742 revidx = find_pack_revindex(p, obj_offset);
1744 nth_packed_object_oid(&base_oid, p, revidx->nr);
1745 error("failed to read delta base object %s"
1746 " at offset %"PRIuMAX" from %s",
1747 oid_to_hex(&base_oid), (uintmax_t)obj_offset,
1749 mark_bad_packed_object(p, base_oid.hash);
1750 base = read_object(r, &base_oid, &type, &base_size);
1751 external_base = base;
1755 i = --delta_stack_nr;
1756 obj_offset = delta_stack[i].obj_offset;
1757 curpos = delta_stack[i].curpos;
1758 delta_size = delta_stack[i].size;
1763 delta_data = unpack_compressed_entry(p, &w_curs, curpos, delta_size);
1766 error("failed to unpack compressed delta "
1767 "at offset %"PRIuMAX" from %s",
1768 (uintmax_t)curpos, p->pack_name);
1770 free(external_base);
1774 data = patch_delta(base, base_size,
1775 delta_data, delta_size,
1779 * We could not apply the delta; warn the user, but keep going.
1780 * Our failure will be noticed either in the next iteration of
1781 * the loop, or if this is the final delta, in the caller when
1782 * we return NULL. Those code paths will take care of making
1783 * a more explicit warning and retrying with another copy of
1787 error("failed to apply delta");
1790 free(external_base);
1799 unuse_pack(&w_curs);
1801 if (delta_stack != small_delta_stack)
1807 int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32_t *result)
1809 const unsigned char *index_fanout = p->index_data;
1810 const unsigned char *index_lookup;
1811 const unsigned int hashsz = the_hash_algo->rawsz;
1812 int index_lookup_width;
1815 BUG("bsearch_pack called without a valid pack-index");
1817 index_lookup = index_fanout + 4 * 256;
1818 if (p->index_version == 1) {
1819 index_lookup_width = hashsz + 4;
1822 index_lookup_width = hashsz;
1827 return bsearch_hash(oid->hash, (const uint32_t*)index_fanout,
1828 index_lookup, index_lookup_width, result);
1831 const unsigned char *nth_packed_object_sha1(struct packed_git *p,
1834 const unsigned char *index = p->index_data;
1835 const unsigned int hashsz = the_hash_algo->rawsz;
1837 if (open_pack_index(p))
1839 index = p->index_data;
1841 if (n >= p->num_objects)
1844 if (p->index_version == 1) {
1845 return index + (hashsz + 4) * n + 4;
1848 return index + hashsz * n;
1852 const struct object_id *nth_packed_object_oid(struct object_id *oid,
1853 struct packed_git *p,
1856 const unsigned char *hash = nth_packed_object_sha1(p, n);
1859 hashcpy(oid->hash, hash);
1863 void check_pack_index_ptr(const struct packed_git *p, const void *vptr)
1865 const unsigned char *ptr = vptr;
1866 const unsigned char *start = p->index_data;
1867 const unsigned char *end = start + p->index_size;
1869 die(_("offset before start of pack index for %s (corrupt index?)"),
1871 /* No need to check for underflow; .idx files must be at least 8 bytes */
1873 die(_("offset beyond end of pack index for %s (truncated index?)"),
1877 off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n)
1879 const unsigned char *index = p->index_data;
1880 const unsigned int hashsz = the_hash_algo->rawsz;
1882 if (p->index_version == 1) {
1883 return ntohl(*((uint32_t *)(index + (hashsz + 4) * n)));
1886 index += 8 + p->num_objects * (hashsz + 4);
1887 off = ntohl(*((uint32_t *)(index + 4 * n)));
1888 if (!(off & 0x80000000))
1890 index += p->num_objects * 4 + (off & 0x7fffffff) * 8;
1891 check_pack_index_ptr(p, index);
1892 return get_be64(index);
1896 off_t find_pack_entry_one(const unsigned char *sha1,
1897 struct packed_git *p)
1899 const unsigned char *index = p->index_data;
1900 struct object_id oid;
1904 if (open_pack_index(p))
1908 hashcpy(oid.hash, sha1);
1909 if (bsearch_pack(&oid, p, &result))
1910 return nth_packed_object_offset(p, result);
1914 int is_pack_valid(struct packed_git *p)
1916 /* An already open pack is known to be valid. */
1917 if (p->pack_fd != -1)
1920 /* If the pack has one window completely covering the
1921 * file size, the pack is known to be valid even if
1922 * the descriptor is not currently open.
1925 struct pack_window *w = p->windows;
1927 if (!w->offset && w->len == p->pack_size)
1931 /* Force the pack to open to prove its valid. */
1932 return !open_packed_git(p);
1935 struct packed_git *find_sha1_pack(const unsigned char *sha1,
1936 struct packed_git *packs)
1938 struct packed_git *p;
1940 for (p = packs; p; p = p->next) {
1941 if (find_pack_entry_one(sha1, p))
1948 static int fill_pack_entry(const struct object_id *oid,
1949 struct pack_entry *e,
1950 struct packed_git *p)
1954 if (p->num_bad_objects) {
1956 for (i = 0; i < p->num_bad_objects; i++)
1957 if (hasheq(oid->hash,
1958 p->bad_object_sha1 + the_hash_algo->rawsz * i))
1962 offset = find_pack_entry_one(oid->hash, p);
1967 * We are about to tell the caller where they can locate the
1968 * requested object. We better make sure the packfile is
1969 * still here and can be accessed before supplying that
1970 * answer, as it may have been deleted since the index was
1973 if (!is_pack_valid(p))
1980 int find_pack_entry(struct repository *r, const struct object_id *oid, struct pack_entry *e)
1982 struct list_head *pos;
1983 struct multi_pack_index *m;
1985 prepare_packed_git(r);
1986 if (!r->objects->packed_git && !r->objects->multi_pack_index)
1989 for (m = r->objects->multi_pack_index; m; m = m->next) {
1990 if (fill_midx_entry(oid, e, m))
1994 list_for_each(pos, &r->objects->packed_git_mru) {
1995 struct packed_git *p = list_entry(pos, struct packed_git, mru);
1996 if (fill_pack_entry(oid, e, p)) {
1997 list_move(&p->mru, &r->objects->packed_git_mru);
2004 int has_object_pack(const struct object_id *oid)
2006 struct pack_entry e;
2007 return find_pack_entry(the_repository, oid, &e);
2010 int has_pack_index(const unsigned char *sha1)
2013 if (stat(sha1_pack_index_name(sha1), &st))
2018 int for_each_object_in_pack(struct packed_git *p,
2019 each_packed_object_fn cb, void *data,
2020 enum for_each_object_flags flags)
2025 if (flags & FOR_EACH_OBJECT_PACK_ORDER)
2026 load_pack_revindex(p);
2028 for (i = 0; i < p->num_objects; i++) {
2030 struct object_id oid;
2032 if (flags & FOR_EACH_OBJECT_PACK_ORDER)
2033 pos = p->revindex[i].nr;
2037 if (!nth_packed_object_oid(&oid, p, pos))
2038 return error("unable to get sha1 of object %u in %s",
2041 r = cb(&oid, p, pos, data);
2048 int for_each_packed_object(each_packed_object_fn cb, void *data,
2049 enum for_each_object_flags flags)
2051 struct packed_git *p;
2053 int pack_errors = 0;
2055 prepare_packed_git(the_repository);
2056 for (p = get_all_packs(the_repository); p; p = p->next) {
2057 if ((flags & FOR_EACH_OBJECT_LOCAL_ONLY) && !p->pack_local)
2059 if ((flags & FOR_EACH_OBJECT_PROMISOR_ONLY) &&
2062 if (open_pack_index(p)) {
2066 r = for_each_object_in_pack(p, cb, data, flags);
2070 return r ? r : pack_errors;
2073 static int add_promisor_object(const struct object_id *oid,
2074 struct packed_git *pack,
2078 struct oidset *set = set_;
2079 struct object *obj = parse_object(the_repository, oid);
2083 oidset_insert(set, oid);
2086 * If this is a tree, commit, or tag, the objects it refers
2087 * to are also promisor objects. (Blobs refer to no objects->)
2089 if (obj->type == OBJ_TREE) {
2090 struct tree *tree = (struct tree *)obj;
2091 struct tree_desc desc;
2092 struct name_entry entry;
2093 if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
2095 * Error messages are given when packs are
2096 * verified, so do not print any here.
2099 while (tree_entry_gently(&desc, &entry))
2100 oidset_insert(set, &entry.oid);
2101 } else if (obj->type == OBJ_COMMIT) {
2102 struct commit *commit = (struct commit *) obj;
2103 struct commit_list *parents = commit->parents;
2105 oidset_insert(set, get_commit_tree_oid(commit));
2106 for (; parents; parents = parents->next)
2107 oidset_insert(set, &parents->item->object.oid);
2108 } else if (obj->type == OBJ_TAG) {
2109 struct tag *tag = (struct tag *) obj;
2110 oidset_insert(set, &tag->tagged->oid);
2115 int is_promisor_object(const struct object_id *oid)
2117 static struct oidset promisor_objects;
2118 static int promisor_objects_prepared;
2120 if (!promisor_objects_prepared) {
2121 if (repository_format_partial_clone) {
2122 for_each_packed_object(add_promisor_object,
2124 FOR_EACH_OBJECT_PROMISOR_ONLY);
2126 promisor_objects_prepared = 1;
2128 return oidset_contains(&promisor_objects, oid);