2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
6 * This handles basic git sha1 object files - packing, unpacking,
10 #include "string-list.h"
16 #include "run-command.h"
19 #include "tree-walk.h"
21 #include "pack-revindex.h"
22 #include "sha1-lookup.h"
23 #include "bulk-checkin.h"
24 #include "streaming.h"
28 #include "mergesort.h"
31 #define SZ_FMT PRIuMAX
32 static inline uintmax_t sz_fmt(size_t s
) { return s
; }
34 const unsigned char null_sha1
[20];
35 const struct object_id null_oid
;
36 const struct object_id empty_tree_oid
= {
37 EMPTY_TREE_SHA1_BIN_LITERAL
39 const struct object_id empty_blob_oid
= {
40 EMPTY_BLOB_SHA1_BIN_LITERAL
44 * This is meant to hold a *small* number of objects that you would
45 * want read_sha1_file() to be able to return, but yet you do not want
46 * to write them into the object store (e.g. a browse-only
49 static struct cached_object
{
50 unsigned char sha1
[20];
51 enum object_type type
;
55 static int cached_object_nr
, cached_object_alloc
;
57 static struct cached_object empty_tree
= {
58 EMPTY_TREE_SHA1_BIN_LITERAL
,
64 static struct cached_object
*find_cached_object(const unsigned char *sha1
)
67 struct cached_object
*co
= cached_objects
;
69 for (i
= 0; i
< cached_object_nr
; i
++, co
++) {
70 if (!hashcmp(co
->sha1
, sha1
))
73 if (!hashcmp(sha1
, empty_tree
.sha1
))
78 int mkdir_in_gitdir(const char *path
)
80 if (mkdir(path
, 0777)) {
81 int saved_errno
= errno
;
83 struct strbuf sb
= STRBUF_INIT
;
88 * Are we looking at a path in a symlinked worktree
89 * whose original repository does not yet have it?
90 * e.g. .git/rr-cache pointing at its original
91 * repository in which the user hasn't performed any
92 * conflict resolution yet?
94 if (lstat(path
, &st
) || !S_ISLNK(st
.st_mode
) ||
95 strbuf_readlink(&sb
, path
, st
.st_size
) ||
96 !is_absolute_path(sb
.buf
) ||
97 mkdir(sb
.buf
, 0777)) {
104 return adjust_shared_perm(path
);
107 enum scld_error
safe_create_leading_directories(char *path
)
109 char *next_component
= path
+ offset_1st_component(path
);
110 enum scld_error ret
= SCLD_OK
;
112 while (ret
== SCLD_OK
&& next_component
) {
114 char *slash
= next_component
, slash_character
;
116 while (*slash
&& !is_dir_sep(*slash
))
122 next_component
= slash
+ 1;
123 while (is_dir_sep(*next_component
))
125 if (!*next_component
)
128 slash_character
= *slash
;
130 if (!stat(path
, &st
)) {
132 if (!S_ISDIR(st
.st_mode
))
134 } else if (mkdir(path
, 0777)) {
135 if (errno
== EEXIST
&&
136 !stat(path
, &st
) && S_ISDIR(st
.st_mode
))
137 ; /* somebody created it since we checked */
138 else if (errno
== ENOENT
)
140 * Either mkdir() failed because
141 * somebody just pruned the containing
142 * directory, or stat() failed because
143 * the file that was in our way was
144 * just removed. Either way, inform
145 * the caller that it might be worth
151 } else if (adjust_shared_perm(path
)) {
154 *slash
= slash_character
;
159 enum scld_error
safe_create_leading_directories_const(const char *path
)
161 /* path points to cache entries, so xstrdup before messing with it */
162 char *buf
= xstrdup(path
);
163 enum scld_error result
= safe_create_leading_directories(buf
);
168 static void fill_sha1_path(struct strbuf
*buf
, const unsigned char *sha1
)
171 for (i
= 0; i
< 20; i
++) {
172 static char hex
[] = "0123456789abcdef";
173 unsigned int val
= sha1
[i
];
174 strbuf_addch(buf
, hex
[val
>> 4]);
175 strbuf_addch(buf
, hex
[val
& 0xf]);
177 strbuf_addch(buf
, '/');
181 const char *sha1_file_name(const unsigned char *sha1
)
183 static struct strbuf buf
= STRBUF_INIT
;
186 strbuf_addf(&buf
, "%s/", get_object_directory());
188 fill_sha1_path(&buf
, sha1
);
192 struct strbuf
*alt_scratch_buf(struct alternate_object_database
*alt
)
194 strbuf_setlen(&alt
->scratch
, alt
->base_len
);
195 return &alt
->scratch
;
198 static const char *alt_sha1_path(struct alternate_object_database
*alt
,
199 const unsigned char *sha1
)
201 struct strbuf
*buf
= alt_scratch_buf(alt
);
202 fill_sha1_path(buf
, sha1
);
206 char *odb_pack_name(struct strbuf
*buf
,
207 const unsigned char *sha1
,
211 strbuf_addf(buf
, "%s/pack/pack-%s.%s", get_object_directory(),
212 sha1_to_hex(sha1
), ext
);
216 char *sha1_pack_name(const unsigned char *sha1
)
218 static struct strbuf buf
= STRBUF_INIT
;
219 return odb_pack_name(&buf
, sha1
, "pack");
222 char *sha1_pack_index_name(const unsigned char *sha1
)
224 static struct strbuf buf
= STRBUF_INIT
;
225 return odb_pack_name(&buf
, sha1
, "idx");
228 struct alternate_object_database
*alt_odb_list
;
229 static struct alternate_object_database
**alt_odb_tail
;
232 * Return non-zero iff the path is usable as an alternate object database.
234 static int alt_odb_usable(struct strbuf
*path
, const char *normalized_objdir
)
236 struct alternate_object_database
*alt
;
238 /* Detect cases where alternate disappeared */
239 if (!is_directory(path
->buf
)) {
240 error("object directory %s does not exist; "
241 "check .git/objects/info/alternates.",
247 * Prevent the common mistake of listing the same
248 * thing twice, or object directory itself.
250 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
251 if (!fspathcmp(path
->buf
, alt
->path
))
254 if (!fspathcmp(path
->buf
, normalized_objdir
))
261 * Prepare alternate object database registry.
263 * The variable alt_odb_list points at the list of struct
264 * alternate_object_database. The elements on this list come from
265 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
266 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
267 * whose contents is similar to that environment variable but can be
268 * LF separated. Its base points at a statically allocated buffer that
269 * contains "/the/directory/corresponding/to/.git/objects/...", while
270 * its name points just after the slash at the end of ".git/objects/"
271 * in the example above, and has enough space to hold 40-byte hex
272 * SHA1, an extra slash for the first level indirection, and the
275 static int link_alt_odb_entry(const char *entry
, const char *relative_base
,
276 int depth
, const char *normalized_objdir
)
278 struct alternate_object_database
*ent
;
279 struct strbuf pathbuf
= STRBUF_INIT
;
281 if (!is_absolute_path(entry
) && relative_base
) {
282 strbuf_realpath(&pathbuf
, relative_base
, 1);
283 strbuf_addch(&pathbuf
, '/');
285 strbuf_addstr(&pathbuf
, entry
);
287 if (strbuf_normalize_path(&pathbuf
) < 0 && relative_base
) {
288 error("unable to normalize alternate object path: %s",
290 strbuf_release(&pathbuf
);
295 * The trailing slash after the directory name is given by
296 * this function at the end. Remove duplicates.
298 while (pathbuf
.len
&& pathbuf
.buf
[pathbuf
.len
- 1] == '/')
299 strbuf_setlen(&pathbuf
, pathbuf
.len
- 1);
301 if (!alt_odb_usable(&pathbuf
, normalized_objdir
)) {
302 strbuf_release(&pathbuf
);
306 ent
= alloc_alt_odb(pathbuf
.buf
);
308 /* add the alternate entry */
310 alt_odb_tail
= &(ent
->next
);
313 /* recursively add alternates */
314 read_info_alternates(pathbuf
.buf
, depth
+ 1);
316 strbuf_release(&pathbuf
);
320 static const char *parse_alt_odb_entry(const char *string
,
328 if (*string
== '#') {
329 /* comment; consume up to next separator */
330 end
= strchrnul(string
, sep
);
331 } else if (*string
== '"' && !unquote_c_style(out
, string
, &end
)) {
333 * quoted path; unquote_c_style has copied the
334 * data for us and set "end". Broken quoting (e.g.,
335 * an entry that doesn't end with a quote) falls
336 * back to the unquoted case below.
339 /* normal, unquoted path */
340 end
= strchrnul(string
, sep
);
341 strbuf_add(out
, string
, end
- string
);
349 static void link_alt_odb_entries(const char *alt
, int len
, int sep
,
350 const char *relative_base
, int depth
)
352 struct strbuf objdirbuf
= STRBUF_INIT
;
353 struct strbuf entry
= STRBUF_INIT
;
356 error("%s: ignoring alternate object stores, nesting too deep.",
361 strbuf_add_absolute_path(&objdirbuf
, get_object_directory());
362 if (strbuf_normalize_path(&objdirbuf
) < 0)
363 die("unable to normalize object directory: %s",
367 alt
= parse_alt_odb_entry(alt
, sep
, &entry
);
370 link_alt_odb_entry(entry
.buf
, relative_base
, depth
, objdirbuf
.buf
);
372 strbuf_release(&entry
);
373 strbuf_release(&objdirbuf
);
376 void read_info_alternates(const char * relative_base
, int depth
)
384 path
= xstrfmt("%s/info/alternates", relative_base
);
389 if (fstat(fd
, &st
) || (st
.st_size
== 0)) {
393 mapsz
= xsize_t(st
.st_size
);
394 map
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
397 link_alt_odb_entries(map
, mapsz
, '\n', relative_base
, depth
);
402 struct alternate_object_database
*alloc_alt_odb(const char *dir
)
404 struct alternate_object_database
*ent
;
406 FLEX_ALLOC_STR(ent
, path
, dir
);
407 strbuf_init(&ent
->scratch
, 0);
408 strbuf_addf(&ent
->scratch
, "%s/", dir
);
409 ent
->base_len
= ent
->scratch
.len
;
414 void add_to_alternates_file(const char *reference
)
416 struct lock_file
*lock
= xcalloc(1, sizeof(struct lock_file
));
417 char *alts
= git_pathdup("objects/info/alternates");
420 hold_lock_file_for_update(lock
, alts
, LOCK_DIE_ON_ERROR
);
421 out
= fdopen_lock_file(lock
, "w");
423 die_errno("unable to fdopen alternates lockfile");
425 in
= fopen(alts
, "r");
427 struct strbuf line
= STRBUF_INIT
;
430 while (strbuf_getline(&line
, in
) != EOF
) {
431 if (!strcmp(reference
, line
.buf
)) {
435 fprintf_or_die(out
, "%s\n", line
.buf
);
438 strbuf_release(&line
);
442 rollback_lock_file(lock
);
446 else if (errno
!= ENOENT
)
447 die_errno("unable to read alternates file");
450 fprintf_or_die(out
, "%s\n", reference
);
451 if (commit_lock_file(lock
))
452 die_errno("unable to move new alternates file into place");
454 link_alt_odb_entries(reference
, strlen(reference
), '\n', NULL
, 0);
459 void add_to_alternates_memory(const char *reference
)
462 * Make sure alternates are initialized, or else our entry may be
463 * overwritten when they are.
467 link_alt_odb_entries(reference
, strlen(reference
), '\n', NULL
, 0);
471 * Compute the exact path an alternate is at and returns it. In case of
472 * error NULL is returned and the human readable error is added to `err`
473 * `path` may be relative and should point to $GITDIR.
474 * `err` must not be null.
476 char *compute_alternate_path(const char *path
, struct strbuf
*err
)
478 char *ref_git
= NULL
;
479 const char *repo
, *ref_git_s
;
482 ref_git_s
= real_path_if_valid(path
);
485 strbuf_addf(err
, _("path '%s' does not exist"), path
);
489 * Beware: read_gitfile(), real_path() and mkpath()
490 * return static buffer
492 ref_git
= xstrdup(ref_git_s
);
494 repo
= read_gitfile(ref_git
);
496 repo
= read_gitfile(mkpath("%s/.git", ref_git
));
499 ref_git
= xstrdup(repo
);
502 if (!repo
&& is_directory(mkpath("%s/.git/objects", ref_git
))) {
503 char *ref_git_git
= mkpathdup("%s/.git", ref_git
);
505 ref_git
= ref_git_git
;
506 } else if (!is_directory(mkpath("%s/objects", ref_git
))) {
507 struct strbuf sb
= STRBUF_INIT
;
509 if (get_common_dir(&sb
, ref_git
)) {
511 _("reference repository '%s' as a linked "
512 "checkout is not supported yet."),
517 strbuf_addf(err
, _("reference repository '%s' is not a "
518 "local repository."), path
);
522 if (!access(mkpath("%s/shallow", ref_git
), F_OK
)) {
523 strbuf_addf(err
, _("reference repository '%s' is shallow"),
529 if (!access(mkpath("%s/info/grafts", ref_git
), F_OK
)) {
531 _("reference repository '%s' is grafted"),
546 int foreach_alt_odb(alt_odb_fn fn
, void *cb
)
548 struct alternate_object_database
*ent
;
552 for (ent
= alt_odb_list
; ent
; ent
= ent
->next
) {
560 void prepare_alt_odb(void)
567 alt
= getenv(ALTERNATE_DB_ENVIRONMENT
);
570 alt_odb_tail
= &alt_odb_list
;
571 link_alt_odb_entries(alt
, strlen(alt
), PATH_SEP
, NULL
, 0);
573 read_info_alternates(get_object_directory(), 0);
576 /* Returns 1 if we have successfully freshened the file, 0 otherwise. */
577 static int freshen_file(const char *fn
)
580 t
.actime
= t
.modtime
= time(NULL
);
581 return !utime(fn
, &t
);
585 * All of the check_and_freshen functions return 1 if the file exists and was
586 * freshened (if freshening was requested), 0 otherwise. If they return
587 * 0, you should not assume that it is safe to skip a write of the object (it
588 * either does not exist on disk, or has a stale mtime and may be subject to
591 static int check_and_freshen_file(const char *fn
, int freshen
)
593 if (access(fn
, F_OK
))
595 if (freshen
&& !freshen_file(fn
))
600 static int check_and_freshen_local(const unsigned char *sha1
, int freshen
)
602 return check_and_freshen_file(sha1_file_name(sha1
), freshen
);
605 static int check_and_freshen_nonlocal(const unsigned char *sha1
, int freshen
)
607 struct alternate_object_database
*alt
;
609 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
610 const char *path
= alt_sha1_path(alt
, sha1
);
611 if (check_and_freshen_file(path
, freshen
))
617 static int check_and_freshen(const unsigned char *sha1
, int freshen
)
619 return check_and_freshen_local(sha1
, freshen
) ||
620 check_and_freshen_nonlocal(sha1
, freshen
);
623 int has_loose_object_nonlocal(const unsigned char *sha1
)
625 return check_and_freshen_nonlocal(sha1
, 0);
628 static int has_loose_object(const unsigned char *sha1
)
630 return check_and_freshen(sha1
, 0);
633 static unsigned int pack_used_ctr
;
634 static unsigned int pack_mmap_calls
;
635 static unsigned int peak_pack_open_windows
;
636 static unsigned int pack_open_windows
;
637 static unsigned int pack_open_fds
;
638 static unsigned int pack_max_fds
;
639 static size_t peak_pack_mapped
;
640 static size_t pack_mapped
;
641 struct packed_git
*packed_git
;
643 static struct mru packed_git_mru_storage
;
644 struct mru
*packed_git_mru
= &packed_git_mru_storage
;
646 void pack_report(void)
649 "pack_report: getpagesize() = %10" SZ_FMT
"\n"
650 "pack_report: core.packedGitWindowSize = %10" SZ_FMT
"\n"
651 "pack_report: core.packedGitLimit = %10" SZ_FMT
"\n",
652 sz_fmt(getpagesize()),
653 sz_fmt(packed_git_window_size
),
654 sz_fmt(packed_git_limit
));
656 "pack_report: pack_used_ctr = %10u\n"
657 "pack_report: pack_mmap_calls = %10u\n"
658 "pack_report: pack_open_windows = %10u / %10u\n"
659 "pack_report: pack_mapped = "
660 "%10" SZ_FMT
" / %10" SZ_FMT
"\n",
663 pack_open_windows
, peak_pack_open_windows
,
664 sz_fmt(pack_mapped
), sz_fmt(peak_pack_mapped
));
668 * Open and mmap the index file at path, perform a couple of
669 * consistency checks, then record its information to p. Return 0 on
672 static int check_packed_git_idx(const char *path
, struct packed_git
*p
)
675 struct pack_idx_header
*hdr
;
677 uint32_t version
, nr
, i
, *index
;
678 int fd
= git_open(path
);
683 if (fstat(fd
, &st
)) {
687 idx_size
= xsize_t(st
.st_size
);
688 if (idx_size
< 4 * 256 + 20 + 20) {
690 return error("index file %s is too small", path
);
692 idx_map
= xmmap(NULL
, idx_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
696 if (hdr
->idx_signature
== htonl(PACK_IDX_SIGNATURE
)) {
697 version
= ntohl(hdr
->idx_version
);
698 if (version
< 2 || version
> 2) {
699 munmap(idx_map
, idx_size
);
700 return error("index file %s is version %"PRIu32
701 " and is not supported by this binary"
702 " (try upgrading GIT to a newer version)",
711 index
+= 2; /* skip index header */
712 for (i
= 0; i
< 256; i
++) {
713 uint32_t n
= ntohl(index
[i
]);
715 munmap(idx_map
, idx_size
);
716 return error("non-monotonic index %s", path
);
724 * - 256 index entries 4 bytes each
725 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
726 * - 20-byte SHA1 of the packfile
727 * - 20-byte SHA1 file checksum
729 if (idx_size
!= 4*256 + nr
* 24 + 20 + 20) {
730 munmap(idx_map
, idx_size
);
731 return error("wrong index v1 file size in %s", path
);
733 } else if (version
== 2) {
736 * - 8 bytes of header
737 * - 256 index entries 4 bytes each
738 * - 20-byte sha1 entry * nr
739 * - 4-byte crc entry * nr
740 * - 4-byte offset entry * nr
741 * - 20-byte SHA1 of the packfile
742 * - 20-byte SHA1 file checksum
743 * And after the 4-byte offset table might be a
744 * variable sized table containing 8-byte entries
745 * for offsets larger than 2^31.
747 unsigned long min_size
= 8 + 4*256 + nr
*(20 + 4 + 4) + 20 + 20;
748 unsigned long max_size
= min_size
;
750 max_size
+= (nr
- 1)*8;
751 if (idx_size
< min_size
|| idx_size
> max_size
) {
752 munmap(idx_map
, idx_size
);
753 return error("wrong index v2 file size in %s", path
);
755 if (idx_size
!= min_size
&&
757 * make sure we can deal with large pack offsets.
758 * 31-bit signed offset won't be enough, neither
759 * 32-bit unsigned one will be.
761 (sizeof(off_t
) <= 4)) {
762 munmap(idx_map
, idx_size
);
763 return error("pack too large for current definition of off_t in %s", path
);
767 p
->index_version
= version
;
768 p
->index_data
= idx_map
;
769 p
->index_size
= idx_size
;
774 int open_pack_index(struct packed_git
*p
)
783 if (!strip_suffix(p
->pack_name
, ".pack", &len
))
784 die("BUG: pack_name does not end in .pack");
785 idx_name
= xstrfmt("%.*s.idx", (int)len
, p
->pack_name
);
786 ret
= check_packed_git_idx(idx_name
, p
);
791 static void scan_windows(struct packed_git
*p
,
792 struct packed_git
**lru_p
,
793 struct pack_window
**lru_w
,
794 struct pack_window
**lru_l
)
796 struct pack_window
*w
, *w_l
;
798 for (w_l
= NULL
, w
= p
->windows
; w
; w
= w
->next
) {
800 if (!*lru_w
|| w
->last_used
< (*lru_w
)->last_used
) {
810 static int unuse_one_window(struct packed_git
*current
)
812 struct packed_git
*p
, *lru_p
= NULL
;
813 struct pack_window
*lru_w
= NULL
, *lru_l
= NULL
;
816 scan_windows(current
, &lru_p
, &lru_w
, &lru_l
);
817 for (p
= packed_git
; p
; p
= p
->next
)
818 scan_windows(p
, &lru_p
, &lru_w
, &lru_l
);
820 munmap(lru_w
->base
, lru_w
->len
);
821 pack_mapped
-= lru_w
->len
;
823 lru_l
->next
= lru_w
->next
;
825 lru_p
->windows
= lru_w
->next
;
833 void release_pack_memory(size_t need
)
835 size_t cur
= pack_mapped
;
836 while (need
>= (cur
- pack_mapped
) && unuse_one_window(NULL
))
840 static void mmap_limit_check(size_t length
)
842 static size_t limit
= 0;
844 limit
= git_env_ulong("GIT_MMAP_LIMIT", 0);
849 die("attempting to mmap %"PRIuMAX
" over limit %"PRIuMAX
,
850 (uintmax_t)length
, (uintmax_t)limit
);
853 void *xmmap_gently(void *start
, size_t length
,
854 int prot
, int flags
, int fd
, off_t offset
)
858 mmap_limit_check(length
);
859 ret
= mmap(start
, length
, prot
, flags
, fd
, offset
);
860 if (ret
== MAP_FAILED
) {
863 release_pack_memory(length
);
864 ret
= mmap(start
, length
, prot
, flags
, fd
, offset
);
869 void *xmmap(void *start
, size_t length
,
870 int prot
, int flags
, int fd
, off_t offset
)
872 void *ret
= xmmap_gently(start
, length
, prot
, flags
, fd
, offset
);
873 if (ret
== MAP_FAILED
)
874 die_errno("mmap failed");
878 void close_pack_windows(struct packed_git
*p
)
881 struct pack_window
*w
= p
->windows
;
884 die("pack '%s' still has open windows to it",
886 munmap(w
->base
, w
->len
);
887 pack_mapped
-= w
->len
;
889 p
->windows
= w
->next
;
894 static int close_pack_fd(struct packed_git
*p
)
906 static void close_pack(struct packed_git
*p
)
908 close_pack_windows(p
);
913 void close_all_packs(void)
915 struct packed_git
*p
;
917 for (p
= packed_git
; p
; p
= p
->next
)
919 die("BUG: want to close pack marked 'do-not-close'");
926 * The LRU pack is the one with the oldest MRU window, preferring packs
927 * with no used windows, or the oldest mtime if it has no windows allocated.
929 static void find_lru_pack(struct packed_git
*p
, struct packed_git
**lru_p
, struct pack_window
**mru_w
, int *accept_windows_inuse
)
931 struct pack_window
*w
, *this_mru_w
;
932 int has_windows_inuse
= 0;
935 * Reject this pack if it has windows and the previously selected
936 * one does not. If this pack does not have windows, reject
937 * it if the pack file is newer than the previously selected one.
939 if (*lru_p
&& !*mru_w
&& (p
->windows
|| p
->mtime
> (*lru_p
)->mtime
))
942 for (w
= this_mru_w
= p
->windows
; w
; w
= w
->next
) {
944 * Reject this pack if any of its windows are in use,
945 * but the previously selected pack did not have any
946 * inuse windows. Otherwise, record that this pack
947 * has windows in use.
950 if (*accept_windows_inuse
)
951 has_windows_inuse
= 1;
956 if (w
->last_used
> this_mru_w
->last_used
)
960 * Reject this pack if it has windows that have been
961 * used more recently than the previously selected pack.
962 * If the previously selected pack had windows inuse and
963 * we have not encountered a window in this pack that is
964 * inuse, skip this check since we prefer a pack with no
965 * inuse windows to one that has inuse windows.
967 if (*mru_w
&& *accept_windows_inuse
== has_windows_inuse
&&
968 this_mru_w
->last_used
> (*mru_w
)->last_used
)
977 *accept_windows_inuse
= has_windows_inuse
;
980 static int close_one_pack(void)
982 struct packed_git
*p
, *lru_p
= NULL
;
983 struct pack_window
*mru_w
= NULL
;
984 int accept_windows_inuse
= 1;
986 for (p
= packed_git
; p
; p
= p
->next
) {
987 if (p
->pack_fd
== -1)
989 find_lru_pack(p
, &lru_p
, &mru_w
, &accept_windows_inuse
);
993 return close_pack_fd(lru_p
);
998 void unuse_pack(struct pack_window
**w_cursor
)
1000 struct pack_window
*w
= *w_cursor
;
1007 void close_pack_index(struct packed_git
*p
)
1009 if (p
->index_data
) {
1010 munmap((void *)p
->index_data
, p
->index_size
);
1011 p
->index_data
= NULL
;
1015 static unsigned int get_max_fd_limit(void)
1017 #ifdef RLIMIT_NOFILE
1021 if (!getrlimit(RLIMIT_NOFILE
, &lim
))
1022 return lim
.rlim_cur
;
1028 long open_max
= sysconf(_SC_OPEN_MAX
);
1032 * Otherwise, we got -1 for one of the two
1035 * (1) sysconf() did not understand _SC_OPEN_MAX
1036 * and signaled an error with -1; or
1037 * (2) sysconf() said there is no limit.
1039 * We _could_ clear errno before calling sysconf() to
1040 * tell these two cases apart and return a huge number
1041 * in the latter case to let the caller cap it to a
1042 * value that is not so selfish, but letting the
1043 * fallback OPEN_MAX codepath take care of these cases
1052 return 1; /* see the caller ;-) */
1057 * Do not call this directly as this leaks p->pack_fd on error return;
1058 * call open_packed_git() instead.
1060 static int open_packed_git_1(struct packed_git
*p
)
1063 struct pack_header hdr
;
1064 unsigned char sha1
[20];
1065 unsigned char *idx_sha1
;
1068 if (!p
->index_data
&& open_pack_index(p
))
1069 return error("packfile %s index unavailable", p
->pack_name
);
1071 if (!pack_max_fds
) {
1072 unsigned int max_fds
= get_max_fd_limit();
1074 /* Save 3 for stdin/stdout/stderr, 22 for work */
1076 pack_max_fds
= max_fds
- 25;
1081 while (pack_max_fds
<= pack_open_fds
&& close_one_pack())
1084 p
->pack_fd
= git_open(p
->pack_name
);
1085 if (p
->pack_fd
< 0 || fstat(p
->pack_fd
, &st
))
1089 /* If we created the struct before we had the pack we lack size. */
1090 if (!p
->pack_size
) {
1091 if (!S_ISREG(st
.st_mode
))
1092 return error("packfile %s not a regular file", p
->pack_name
);
1093 p
->pack_size
= st
.st_size
;
1094 } else if (p
->pack_size
!= st
.st_size
)
1095 return error("packfile %s size changed", p
->pack_name
);
1097 /* We leave these file descriptors open with sliding mmap;
1098 * there is no point keeping them open across exec(), though.
1100 fd_flag
= fcntl(p
->pack_fd
, F_GETFD
, 0);
1102 return error("cannot determine file descriptor flags");
1103 fd_flag
|= FD_CLOEXEC
;
1104 if (fcntl(p
->pack_fd
, F_SETFD
, fd_flag
) == -1)
1105 return error("cannot set FD_CLOEXEC");
1107 /* Verify we recognize this pack file format. */
1108 if (read_in_full(p
->pack_fd
, &hdr
, sizeof(hdr
)) != sizeof(hdr
))
1109 return error("file %s is far too short to be a packfile", p
->pack_name
);
1110 if (hdr
.hdr_signature
!= htonl(PACK_SIGNATURE
))
1111 return error("file %s is not a GIT packfile", p
->pack_name
);
1112 if (!pack_version_ok(hdr
.hdr_version
))
1113 return error("packfile %s is version %"PRIu32
" and not"
1114 " supported (try upgrading GIT to a newer version)",
1115 p
->pack_name
, ntohl(hdr
.hdr_version
));
1117 /* Verify the pack matches its index. */
1118 if (p
->num_objects
!= ntohl(hdr
.hdr_entries
))
1119 return error("packfile %s claims to have %"PRIu32
" objects"
1120 " while index indicates %"PRIu32
" objects",
1121 p
->pack_name
, ntohl(hdr
.hdr_entries
),
1123 if (lseek(p
->pack_fd
, p
->pack_size
- sizeof(sha1
), SEEK_SET
) == -1)
1124 return error("end of packfile %s is unavailable", p
->pack_name
);
1125 if (read_in_full(p
->pack_fd
, sha1
, sizeof(sha1
)) != sizeof(sha1
))
1126 return error("packfile %s signature is unavailable", p
->pack_name
);
1127 idx_sha1
= ((unsigned char *)p
->index_data
) + p
->index_size
- 40;
1128 if (hashcmp(sha1
, idx_sha1
))
1129 return error("packfile %s does not match index", p
->pack_name
);
1133 static int open_packed_git(struct packed_git
*p
)
1135 if (!open_packed_git_1(p
))
1141 static int in_window(struct pack_window
*win
, off_t offset
)
1143 /* We must promise at least 20 bytes (one hash) after the
1144 * offset is available from this window, otherwise the offset
1145 * is not actually in this window and a different window (which
1146 * has that one hash excess) must be used. This is to support
1147 * the object header and delta base parsing routines below.
1149 off_t win_off
= win
->offset
;
1150 return win_off
<= offset
1151 && (offset
+ 20) <= (win_off
+ win
->len
);
1154 unsigned char *use_pack(struct packed_git
*p
,
1155 struct pack_window
**w_cursor
,
1157 unsigned long *left
)
1159 struct pack_window
*win
= *w_cursor
;
1161 /* Since packfiles end in a hash of their content and it's
1162 * pointless to ask for an offset into the middle of that
1163 * hash, and the in_window function above wouldn't match
1164 * don't allow an offset too close to the end of the file.
1166 if (!p
->pack_size
&& p
->pack_fd
== -1 && open_packed_git(p
))
1167 die("packfile %s cannot be accessed", p
->pack_name
);
1168 if (offset
> (p
->pack_size
- 20))
1169 die("offset beyond end of packfile (truncated pack?)");
1171 die(_("offset before end of packfile (broken .idx?)"));
1173 if (!win
|| !in_window(win
, offset
)) {
1176 for (win
= p
->windows
; win
; win
= win
->next
) {
1177 if (in_window(win
, offset
))
1181 size_t window_align
= packed_git_window_size
/ 2;
1184 if (p
->pack_fd
== -1 && open_packed_git(p
))
1185 die("packfile %s cannot be accessed", p
->pack_name
);
1187 win
= xcalloc(1, sizeof(*win
));
1188 win
->offset
= (offset
/ window_align
) * window_align
;
1189 len
= p
->pack_size
- win
->offset
;
1190 if (len
> packed_git_window_size
)
1191 len
= packed_git_window_size
;
1192 win
->len
= (size_t)len
;
1193 pack_mapped
+= win
->len
;
1194 while (packed_git_limit
< pack_mapped
1195 && unuse_one_window(p
))
1197 win
->base
= xmmap(NULL
, win
->len
,
1198 PROT_READ
, MAP_PRIVATE
,
1199 p
->pack_fd
, win
->offset
);
1200 if (win
->base
== MAP_FAILED
)
1201 die_errno("packfile %s cannot be mapped",
1203 if (!win
->offset
&& win
->len
== p
->pack_size
1204 && !p
->do_not_close
)
1207 pack_open_windows
++;
1208 if (pack_mapped
> peak_pack_mapped
)
1209 peak_pack_mapped
= pack_mapped
;
1210 if (pack_open_windows
> peak_pack_open_windows
)
1211 peak_pack_open_windows
= pack_open_windows
;
1212 win
->next
= p
->windows
;
1216 if (win
!= *w_cursor
) {
1217 win
->last_used
= pack_used_ctr
++;
1221 offset
-= win
->offset
;
1223 *left
= win
->len
- xsize_t(offset
);
1224 return win
->base
+ offset
;
1227 static struct packed_git
*alloc_packed_git(int extra
)
1229 struct packed_git
*p
= xmalloc(st_add(sizeof(*p
), extra
));
1230 memset(p
, 0, sizeof(*p
));
1235 static void try_to_free_pack_memory(size_t size
)
1237 release_pack_memory(size
);
1240 struct packed_git
*add_packed_git(const char *path
, size_t path_len
, int local
)
1242 static int have_set_try_to_free_routine
;
1245 struct packed_git
*p
;
1247 if (!have_set_try_to_free_routine
) {
1248 have_set_try_to_free_routine
= 1;
1249 set_try_to_free_routine(try_to_free_pack_memory
);
1253 * Make sure a corresponding .pack file exists and that
1254 * the index looks sane.
1256 if (!strip_suffix_mem(path
, &path_len
, ".idx"))
1260 * ".pack" is long enough to hold any suffix we're adding (and
1261 * the use xsnprintf double-checks that)
1263 alloc
= st_add3(path_len
, strlen(".pack"), 1);
1264 p
= alloc_packed_git(alloc
);
1265 memcpy(p
->pack_name
, path
, path_len
);
1267 xsnprintf(p
->pack_name
+ path_len
, alloc
- path_len
, ".keep");
1268 if (!access(p
->pack_name
, F_OK
))
1271 xsnprintf(p
->pack_name
+ path_len
, alloc
- path_len
, ".pack");
1272 if (stat(p
->pack_name
, &st
) || !S_ISREG(st
.st_mode
)) {
1277 /* ok, it looks sane as far as we can check without
1278 * actually mapping the pack file.
1280 p
->pack_size
= st
.st_size
;
1281 p
->pack_local
= local
;
1282 p
->mtime
= st
.st_mtime
;
1283 if (path_len
< 40 || get_sha1_hex(path
+ path_len
- 40, p
->sha1
))
1288 struct packed_git
*parse_pack_index(unsigned char *sha1
, const char *idx_path
)
1290 const char *path
= sha1_pack_name(sha1
);
1291 size_t alloc
= st_add(strlen(path
), 1);
1292 struct packed_git
*p
= alloc_packed_git(alloc
);
1294 memcpy(p
->pack_name
, path
, alloc
); /* includes NUL */
1295 hashcpy(p
->sha1
, sha1
);
1296 if (check_packed_git_idx(idx_path
, p
)) {
1304 void install_packed_git(struct packed_git
*pack
)
1306 if (pack
->pack_fd
!= -1)
1309 pack
->next
= packed_git
;
1313 void (*report_garbage
)(unsigned seen_bits
, const char *path
);
1315 static void report_helper(const struct string_list
*list
,
1316 int seen_bits
, int first
, int last
)
1318 if (seen_bits
== (PACKDIR_FILE_PACK
|PACKDIR_FILE_IDX
))
1321 for (; first
< last
; first
++)
1322 report_garbage(seen_bits
, list
->items
[first
].string
);
1325 static void report_pack_garbage(struct string_list
*list
)
1327 int i
, baselen
= -1, first
= 0, seen_bits
= 0;
1329 if (!report_garbage
)
1332 string_list_sort(list
);
1334 for (i
= 0; i
< list
->nr
; i
++) {
1335 const char *path
= list
->items
[i
].string
;
1336 if (baselen
!= -1 &&
1337 strncmp(path
, list
->items
[first
].string
, baselen
)) {
1338 report_helper(list
, seen_bits
, first
, i
);
1342 if (baselen
== -1) {
1343 const char *dot
= strrchr(path
, '.');
1345 report_garbage(PACKDIR_FILE_GARBAGE
, path
);
1348 baselen
= dot
- path
+ 1;
1351 if (!strcmp(path
+ baselen
, "pack"))
1353 else if (!strcmp(path
+ baselen
, "idx"))
1356 report_helper(list
, seen_bits
, first
, list
->nr
);
1359 static void prepare_packed_git_one(char *objdir
, int local
)
1361 struct strbuf path
= STRBUF_INIT
;
1365 struct string_list garbage
= STRING_LIST_INIT_DUP
;
1367 strbuf_addstr(&path
, objdir
);
1368 strbuf_addstr(&path
, "/pack");
1369 dir
= opendir(path
.buf
);
1371 if (errno
!= ENOENT
)
1372 error_errno("unable to open object pack directory: %s",
1374 strbuf_release(&path
);
1377 strbuf_addch(&path
, '/');
1378 dirnamelen
= path
.len
;
1379 while ((de
= readdir(dir
)) != NULL
) {
1380 struct packed_git
*p
;
1383 if (is_dot_or_dotdot(de
->d_name
))
1386 strbuf_setlen(&path
, dirnamelen
);
1387 strbuf_addstr(&path
, de
->d_name
);
1389 base_len
= path
.len
;
1390 if (strip_suffix_mem(path
.buf
, &base_len
, ".idx")) {
1391 /* Don't reopen a pack we already have. */
1392 for (p
= packed_git
; p
; p
= p
->next
) {
1394 if (strip_suffix(p
->pack_name
, ".pack", &len
) &&
1396 !memcmp(p
->pack_name
, path
.buf
, len
))
1401 * See if it really is a valid .idx file with
1402 * corresponding .pack file that we can map.
1404 (p
= add_packed_git(path
.buf
, path
.len
, local
)) != NULL
)
1405 install_packed_git(p
);
1408 if (!report_garbage
)
1411 if (ends_with(de
->d_name
, ".idx") ||
1412 ends_with(de
->d_name
, ".pack") ||
1413 ends_with(de
->d_name
, ".bitmap") ||
1414 ends_with(de
->d_name
, ".keep"))
1415 string_list_append(&garbage
, path
.buf
);
1417 report_garbage(PACKDIR_FILE_GARBAGE
, path
.buf
);
1420 report_pack_garbage(&garbage
);
1421 string_list_clear(&garbage
, 0);
1422 strbuf_release(&path
);
1425 static int approximate_object_count_valid
;
1428 * Give a fast, rough count of the number of objects in the repository. This
1429 * ignores loose objects completely. If you have a lot of them, then either
1430 * you should repack because your performance will be awful, or they are
1431 * all unreachable objects about to be pruned, in which case they're not really
1432 * interesting as a measure of repo size in the first place.
1434 unsigned long approximate_object_count(void)
1436 static unsigned long count
;
1437 if (!approximate_object_count_valid
) {
1438 struct packed_git
*p
;
1440 prepare_packed_git();
1442 for (p
= packed_git
; p
; p
= p
->next
) {
1443 if (open_pack_index(p
))
1445 count
+= p
->num_objects
;
1451 static void *get_next_packed_git(const void *p
)
1453 return ((const struct packed_git
*)p
)->next
;
1456 static void set_next_packed_git(void *p
, void *next
)
1458 ((struct packed_git
*)p
)->next
= next
;
1461 static int sort_pack(const void *a_
, const void *b_
)
1463 const struct packed_git
*a
= a_
;
1464 const struct packed_git
*b
= b_
;
1468 * Local packs tend to contain objects specific to our
1469 * variant of the project than remote ones. In addition,
1470 * remote ones could be on a network mounted filesystem.
1471 * Favor local ones for these reasons.
1473 st
= a
->pack_local
- b
->pack_local
;
1478 * Younger packs tend to contain more recent objects,
1479 * and more recent objects tend to get accessed more
1482 if (a
->mtime
< b
->mtime
)
1484 else if (a
->mtime
== b
->mtime
)
1489 static void rearrange_packed_git(void)
1491 packed_git
= llist_mergesort(packed_git
, get_next_packed_git
,
1492 set_next_packed_git
, sort_pack
);
1495 static void prepare_packed_git_mru(void)
1497 struct packed_git
*p
;
1499 mru_clear(packed_git_mru
);
1500 for (p
= packed_git
; p
; p
= p
->next
)
1501 mru_append(packed_git_mru
, p
);
1504 static int prepare_packed_git_run_once
= 0;
1505 void prepare_packed_git(void)
1507 struct alternate_object_database
*alt
;
1509 if (prepare_packed_git_run_once
)
1511 prepare_packed_git_one(get_object_directory(), 1);
1513 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
)
1514 prepare_packed_git_one(alt
->path
, 0);
1515 rearrange_packed_git();
1516 prepare_packed_git_mru();
1517 prepare_packed_git_run_once
= 1;
1520 void reprepare_packed_git(void)
1522 approximate_object_count_valid
= 0;
1523 prepare_packed_git_run_once
= 0;
1524 prepare_packed_git();
1527 static void mark_bad_packed_object(struct packed_git
*p
,
1528 const unsigned char *sha1
)
1531 for (i
= 0; i
< p
->num_bad_objects
; i
++)
1532 if (!hashcmp(sha1
, p
->bad_object_sha1
+ GIT_SHA1_RAWSZ
* i
))
1534 p
->bad_object_sha1
= xrealloc(p
->bad_object_sha1
,
1535 st_mult(GIT_SHA1_RAWSZ
,
1536 st_add(p
->num_bad_objects
, 1)));
1537 hashcpy(p
->bad_object_sha1
+ GIT_SHA1_RAWSZ
* p
->num_bad_objects
, sha1
);
1538 p
->num_bad_objects
++;
1541 static const struct packed_git
*has_packed_and_bad(const unsigned char *sha1
)
1543 struct packed_git
*p
;
1546 for (p
= packed_git
; p
; p
= p
->next
)
1547 for (i
= 0; i
< p
->num_bad_objects
; i
++)
1548 if (!hashcmp(sha1
, p
->bad_object_sha1
+ 20 * i
))
1554 * With an in-core object data in "map", rehash it to make sure the
1555 * object name actually matches "sha1" to detect object corruption.
1556 * With "map" == NULL, try reading the object named with "sha1" using
1557 * the streaming interface and rehash it to do the same.
1559 int check_sha1_signature(const unsigned char *sha1
, void *map
,
1560 unsigned long size
, const char *type
)
1562 unsigned char real_sha1
[20];
1563 enum object_type obj_type
;
1564 struct git_istream
*st
;
1570 hash_sha1_file(map
, size
, type
, real_sha1
);
1571 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
1574 st
= open_istream(sha1
, &obj_type
, &size
, NULL
);
1578 /* Generate the header */
1579 hdrlen
= xsnprintf(hdr
, sizeof(hdr
), "%s %lu", typename(obj_type
), size
) + 1;
1583 git_SHA1_Update(&c
, hdr
, hdrlen
);
1585 char buf
[1024 * 16];
1586 ssize_t readlen
= read_istream(st
, buf
, sizeof(buf
));
1594 git_SHA1_Update(&c
, buf
, readlen
);
1596 git_SHA1_Final(real_sha1
, &c
);
1598 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
1601 int git_open_cloexec(const char *name
, int flags
)
1604 static int o_cloexec
= O_CLOEXEC
;
1606 fd
= open(name
, flags
| o_cloexec
);
1607 if ((o_cloexec
& O_CLOEXEC
) && fd
< 0 && errno
== EINVAL
) {
1608 /* Try again w/o O_CLOEXEC: the kernel might not support it */
1609 o_cloexec
&= ~O_CLOEXEC
;
1610 fd
= open(name
, flags
| o_cloexec
);
1613 #if defined(F_GETFL) && defined(F_SETFL) && defined(FD_CLOEXEC)
1615 static int fd_cloexec
= FD_CLOEXEC
;
1617 if (!o_cloexec
&& 0 <= fd
&& fd_cloexec
) {
1618 /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
1619 int flags
= fcntl(fd
, F_GETFL
);
1620 if (fcntl(fd
, F_SETFL
, flags
| fd_cloexec
))
1629 * Find "sha1" as a loose object in the local repository or in an alternate.
1630 * Returns 0 on success, negative on failure.
1632 * The "path" out-parameter will give the path of the object we found (if any).
1633 * Note that it may point to static storage and is only valid until another
1634 * call to sha1_file_name(), etc.
1636 static int stat_sha1_file(const unsigned char *sha1
, struct stat
*st
,
1639 struct alternate_object_database
*alt
;
1641 *path
= sha1_file_name(sha1
);
1642 if (!lstat(*path
, st
))
1647 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
1648 *path
= alt_sha1_path(alt
, sha1
);
1649 if (!lstat(*path
, st
))
1657 * Like stat_sha1_file(), but actually open the object and return the
1658 * descriptor. See the caveats on the "path" parameter above.
1660 static int open_sha1_file(const unsigned char *sha1
, const char **path
)
1663 struct alternate_object_database
*alt
;
1664 int most_interesting_errno
;
1666 *path
= sha1_file_name(sha1
);
1667 fd
= git_open(*path
);
1670 most_interesting_errno
= errno
;
1673 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
1674 *path
= alt_sha1_path(alt
, sha1
);
1675 fd
= git_open(*path
);
1678 if (most_interesting_errno
== ENOENT
)
1679 most_interesting_errno
= errno
;
1681 errno
= most_interesting_errno
;
1686 * Map the loose object at "path" if it is not NULL, or the path found by
1687 * searching for a loose object named "sha1".
1689 static void *map_sha1_file_1(const char *path
,
1690 const unsigned char *sha1
,
1691 unsigned long *size
)
1697 fd
= git_open(path
);
1699 fd
= open_sha1_file(sha1
, &path
);
1704 if (!fstat(fd
, &st
)) {
1705 *size
= xsize_t(st
.st_size
);
1707 /* mmap() is forbidden on empty files */
1708 error("object file %s is empty", path
);
1711 map
= xmmap(NULL
, *size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
1718 void *map_sha1_file(const unsigned char *sha1
, unsigned long *size
)
1720 return map_sha1_file_1(NULL
, sha1
, size
);
1723 unsigned long unpack_object_header_buffer(const unsigned char *buf
,
1724 unsigned long len
, enum object_type
*type
, unsigned long *sizep
)
1727 unsigned long size
, c
;
1728 unsigned long used
= 0;
1731 *type
= (c
>> 4) & 7;
1735 if (len
<= used
|| bitsizeof(long) <= shift
) {
1736 error("bad object header");
1741 size
+= (c
& 0x7f) << shift
;
1748 static int unpack_sha1_short_header(git_zstream
*stream
,
1749 unsigned char *map
, unsigned long mapsize
,
1750 void *buffer
, unsigned long bufsiz
)
1752 /* Get the data stream */
1753 memset(stream
, 0, sizeof(*stream
));
1754 stream
->next_in
= map
;
1755 stream
->avail_in
= mapsize
;
1756 stream
->next_out
= buffer
;
1757 stream
->avail_out
= bufsiz
;
1759 git_inflate_init(stream
);
1760 return git_inflate(stream
, 0);
1763 int unpack_sha1_header(git_zstream
*stream
,
1764 unsigned char *map
, unsigned long mapsize
,
1765 void *buffer
, unsigned long bufsiz
)
1767 int status
= unpack_sha1_short_header(stream
, map
, mapsize
,
1773 /* Make sure we have the terminating NUL */
1774 if (!memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
1779 static int unpack_sha1_header_to_strbuf(git_zstream
*stream
, unsigned char *map
,
1780 unsigned long mapsize
, void *buffer
,
1781 unsigned long bufsiz
, struct strbuf
*header
)
1785 status
= unpack_sha1_short_header(stream
, map
, mapsize
, buffer
, bufsiz
);
1790 * Check if entire header is unpacked in the first iteration.
1792 if (memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
1796 * buffer[0..bufsiz] was not large enough. Copy the partial
1797 * result out to header, and then append the result of further
1798 * reading the stream.
1800 strbuf_add(header
, buffer
, stream
->next_out
- (unsigned char *)buffer
);
1801 stream
->next_out
= buffer
;
1802 stream
->avail_out
= bufsiz
;
1805 status
= git_inflate(stream
, 0);
1806 strbuf_add(header
, buffer
, stream
->next_out
- (unsigned char *)buffer
);
1807 if (memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
1809 stream
->next_out
= buffer
;
1810 stream
->avail_out
= bufsiz
;
1811 } while (status
!= Z_STREAM_END
);
1815 static void *unpack_sha1_rest(git_zstream
*stream
, void *buffer
, unsigned long size
, const unsigned char *sha1
)
1817 int bytes
= strlen(buffer
) + 1;
1818 unsigned char *buf
= xmallocz(size
);
1822 n
= stream
->total_out
- bytes
;
1825 memcpy(buf
, (char *) buffer
+ bytes
, n
);
1827 if (bytes
<= size
) {
1829 * The above condition must be (bytes <= size), not
1830 * (bytes < size). In other words, even though we
1831 * expect no more output and set avail_out to zero,
1832 * the input zlib stream may have bytes that express
1833 * "this concludes the stream", and we *do* want to
1836 * Otherwise we would not be able to test that we
1837 * consumed all the input to reach the expected size;
1838 * we also want to check that zlib tells us that all
1839 * went well with status == Z_STREAM_END at the end.
1841 stream
->next_out
= buf
+ bytes
;
1842 stream
->avail_out
= size
- bytes
;
1843 while (status
== Z_OK
)
1844 status
= git_inflate(stream
, Z_FINISH
);
1846 if (status
== Z_STREAM_END
&& !stream
->avail_in
) {
1847 git_inflate_end(stream
);
1852 error("corrupt loose object '%s'", sha1_to_hex(sha1
));
1853 else if (stream
->avail_in
)
1854 error("garbage at end of loose object '%s'",
1861 * We used to just use "sscanf()", but that's actually way
1862 * too permissive for what we want to check. So do an anal
1863 * object header parse by hand.
1865 static int parse_sha1_header_extended(const char *hdr
, struct object_info
*oi
,
1868 const char *type_buf
= hdr
;
1870 int type
, type_len
= 0;
1873 * The type can be of any size but is followed by
1885 type
= type_from_string_gently(type_buf
, type_len
, 1);
1887 strbuf_add(oi
->typename
, type_buf
, type_len
);
1889 * Set type to 0 if its an unknown object and
1890 * we're obtaining the type using '--allow-unknown-type'
1893 if ((flags
& LOOKUP_UNKNOWN_OBJECT
) && (type
< 0))
1896 die("invalid object type");
1901 * The length must follow immediately, and be in canonical
1902 * decimal format (ie "010" is not valid).
1904 size
= *hdr
++ - '0';
1909 unsigned long c
= *hdr
- '0';
1913 size
= size
* 10 + c
;
1921 * The length must be followed by a zero byte
1923 return *hdr
? -1 : type
;
1926 int parse_sha1_header(const char *hdr
, unsigned long *sizep
)
1928 struct object_info oi
= OBJECT_INFO_INIT
;
1931 return parse_sha1_header_extended(hdr
, &oi
, LOOKUP_REPLACE_OBJECT
);
1934 static void *unpack_sha1_file(void *map
, unsigned long mapsize
, enum object_type
*type
, unsigned long *size
, const unsigned char *sha1
)
1940 ret
= unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
));
1941 if (ret
< Z_OK
|| (*type
= parse_sha1_header(hdr
, size
)) < 0)
1944 return unpack_sha1_rest(&stream
, hdr
, *size
, sha1
);
1947 unsigned long get_size_from_delta(struct packed_git
*p
,
1948 struct pack_window
**w_curs
,
1951 const unsigned char *data
;
1952 unsigned char delta_head
[20], *in
;
1956 memset(&stream
, 0, sizeof(stream
));
1957 stream
.next_out
= delta_head
;
1958 stream
.avail_out
= sizeof(delta_head
);
1960 git_inflate_init(&stream
);
1962 in
= use_pack(p
, w_curs
, curpos
, &stream
.avail_in
);
1963 stream
.next_in
= in
;
1964 st
= git_inflate(&stream
, Z_FINISH
);
1965 curpos
+= stream
.next_in
- in
;
1966 } while ((st
== Z_OK
|| st
== Z_BUF_ERROR
) &&
1967 stream
.total_out
< sizeof(delta_head
));
1968 git_inflate_end(&stream
);
1969 if ((st
!= Z_STREAM_END
) && stream
.total_out
!= sizeof(delta_head
)) {
1970 error("delta data unpack-initial failed");
1974 /* Examine the initial part of the delta to figure out
1979 /* ignore base size */
1980 get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1982 /* Read the result size */
1983 return get_delta_hdr_size(&data
, delta_head
+sizeof(delta_head
));
1986 static off_t
get_delta_base(struct packed_git
*p
,
1987 struct pack_window
**w_curs
,
1989 enum object_type type
,
1990 off_t delta_obj_offset
)
1992 unsigned char *base_info
= use_pack(p
, w_curs
, *curpos
, NULL
);
1995 /* use_pack() assured us we have [base_info, base_info + 20)
1996 * as a range that we can look at without walking off the
1997 * end of the mapped window. Its actually the hash size
1998 * that is assured. An OFS_DELTA longer than the hash size
1999 * is stupid, as then a REF_DELTA would be smaller to store.
2001 if (type
== OBJ_OFS_DELTA
) {
2003 unsigned char c
= base_info
[used
++];
2004 base_offset
= c
& 127;
2007 if (!base_offset
|| MSB(base_offset
, 7))
2008 return 0; /* overflow */
2009 c
= base_info
[used
++];
2010 base_offset
= (base_offset
<< 7) + (c
& 127);
2012 base_offset
= delta_obj_offset
- base_offset
;
2013 if (base_offset
<= 0 || base_offset
>= delta_obj_offset
)
2014 return 0; /* out of bound */
2016 } else if (type
== OBJ_REF_DELTA
) {
2017 /* The base entry _must_ be in the same pack */
2018 base_offset
= find_pack_entry_one(base_info
, p
);
2021 die("I am totally screwed");
2026 * Like get_delta_base above, but we return the sha1 instead of the pack
2027 * offset. This means it is cheaper for REF deltas (we do not have to do
2028 * the final object lookup), but more expensive for OFS deltas (we
2029 * have to load the revidx to convert the offset back into a sha1).
2031 static const unsigned char *get_delta_base_sha1(struct packed_git
*p
,
2032 struct pack_window
**w_curs
,
2034 enum object_type type
,
2035 off_t delta_obj_offset
)
2037 if (type
== OBJ_REF_DELTA
) {
2038 unsigned char *base
= use_pack(p
, w_curs
, curpos
, NULL
);
2040 } else if (type
== OBJ_OFS_DELTA
) {
2041 struct revindex_entry
*revidx
;
2042 off_t base_offset
= get_delta_base(p
, w_curs
, &curpos
,
2043 type
, delta_obj_offset
);
2048 revidx
= find_pack_revindex(p
, base_offset
);
2052 return nth_packed_object_sha1(p
, revidx
->nr
);
2057 int unpack_object_header(struct packed_git
*p
,
2058 struct pack_window
**w_curs
,
2060 unsigned long *sizep
)
2062 unsigned char *base
;
2065 enum object_type type
;
2067 /* use_pack() assures us we have [base, base + 20) available
2068 * as a range that we can look at. (Its actually the hash
2069 * size that is assured.) With our object header encoding
2070 * the maximum deflated object size is 2^137, which is just
2071 * insane, so we know won't exceed what we have been given.
2073 base
= use_pack(p
, w_curs
, *curpos
, &left
);
2074 used
= unpack_object_header_buffer(base
, left
, &type
, sizep
);
2083 static int retry_bad_packed_offset(struct packed_git
*p
, off_t obj_offset
)
2086 struct revindex_entry
*revidx
;
2087 const unsigned char *sha1
;
2088 revidx
= find_pack_revindex(p
, obj_offset
);
2091 sha1
= nth_packed_object_sha1(p
, revidx
->nr
);
2092 mark_bad_packed_object(p
, sha1
);
2093 type
= sha1_object_info(sha1
, NULL
);
2094 if (type
<= OBJ_NONE
)
2099 #define POI_STACK_PREALLOC 64
2101 static enum object_type
packed_to_object_type(struct packed_git
*p
,
2103 enum object_type type
,
2104 struct pack_window
**w_curs
,
2107 off_t small_poi_stack
[POI_STACK_PREALLOC
];
2108 off_t
*poi_stack
= small_poi_stack
;
2109 int poi_stack_nr
= 0, poi_stack_alloc
= POI_STACK_PREALLOC
;
2111 while (type
== OBJ_OFS_DELTA
|| type
== OBJ_REF_DELTA
) {
2114 /* Push the object we're going to leave behind */
2115 if (poi_stack_nr
>= poi_stack_alloc
&& poi_stack
== small_poi_stack
) {
2116 poi_stack_alloc
= alloc_nr(poi_stack_nr
);
2117 ALLOC_ARRAY(poi_stack
, poi_stack_alloc
);
2118 memcpy(poi_stack
, small_poi_stack
, sizeof(off_t
)*poi_stack_nr
);
2120 ALLOC_GROW(poi_stack
, poi_stack_nr
+1, poi_stack_alloc
);
2122 poi_stack
[poi_stack_nr
++] = obj_offset
;
2123 /* If parsing the base offset fails, just unwind */
2124 base_offset
= get_delta_base(p
, w_curs
, &curpos
, type
, obj_offset
);
2127 curpos
= obj_offset
= base_offset
;
2128 type
= unpack_object_header(p
, w_curs
, &curpos
, &size
);
2129 if (type
<= OBJ_NONE
) {
2130 /* If getting the base itself fails, we first
2131 * retry the base, otherwise unwind */
2132 type
= retry_bad_packed_offset(p
, base_offset
);
2133 if (type
> OBJ_NONE
)
2147 error("unknown object type %i at offset %"PRIuMAX
" in %s",
2148 type
, (uintmax_t)obj_offset
, p
->pack_name
);
2153 if (poi_stack
!= small_poi_stack
)
2158 while (poi_stack_nr
) {
2159 obj_offset
= poi_stack
[--poi_stack_nr
];
2160 type
= retry_bad_packed_offset(p
, obj_offset
);
2161 if (type
> OBJ_NONE
)
2168 int packed_object_info(struct packed_git
*p
, off_t obj_offset
,
2169 struct object_info
*oi
)
2171 struct pack_window
*w_curs
= NULL
;
2173 off_t curpos
= obj_offset
;
2174 enum object_type type
;
2177 * We always get the representation type, but only convert it to
2178 * a "real" type later if the caller is interested.
2180 type
= unpack_object_header(p
, &w_curs
, &curpos
, &size
);
2183 if (type
== OBJ_OFS_DELTA
|| type
== OBJ_REF_DELTA
) {
2184 off_t tmp_pos
= curpos
;
2185 off_t base_offset
= get_delta_base(p
, &w_curs
, &tmp_pos
,
2191 *oi
->sizep
= get_size_from_delta(p
, &w_curs
, tmp_pos
);
2192 if (*oi
->sizep
== 0) {
2201 if (oi
->disk_sizep
) {
2202 struct revindex_entry
*revidx
= find_pack_revindex(p
, obj_offset
);
2203 *oi
->disk_sizep
= revidx
[1].offset
- obj_offset
;
2207 *oi
->typep
= packed_to_object_type(p
, obj_offset
, type
, &w_curs
, curpos
);
2208 if (*oi
->typep
< 0) {
2214 if (oi
->delta_base_sha1
) {
2215 if (type
== OBJ_OFS_DELTA
|| type
== OBJ_REF_DELTA
) {
2216 const unsigned char *base
;
2218 base
= get_delta_base_sha1(p
, &w_curs
, curpos
,
2225 hashcpy(oi
->delta_base_sha1
, base
);
2227 hashclr(oi
->delta_base_sha1
);
2231 unuse_pack(&w_curs
);
2235 static void *unpack_compressed_entry(struct packed_git
*p
,
2236 struct pack_window
**w_curs
,
2242 unsigned char *buffer
, *in
;
2244 buffer
= xmallocz_gently(size
);
2247 memset(&stream
, 0, sizeof(stream
));
2248 stream
.next_out
= buffer
;
2249 stream
.avail_out
= size
+ 1;
2251 git_inflate_init(&stream
);
2253 in
= use_pack(p
, w_curs
, curpos
, &stream
.avail_in
);
2254 stream
.next_in
= in
;
2255 st
= git_inflate(&stream
, Z_FINISH
);
2256 if (!stream
.avail_out
)
2257 break; /* the payload is larger than it should be */
2258 curpos
+= stream
.next_in
- in
;
2259 } while (st
== Z_OK
|| st
== Z_BUF_ERROR
);
2260 git_inflate_end(&stream
);
2261 if ((st
!= Z_STREAM_END
) || stream
.total_out
!= size
) {
2269 static struct hashmap delta_base_cache
;
2270 static size_t delta_base_cached
;
2272 static LIST_HEAD(delta_base_cache_lru
);
2274 struct delta_base_cache_key
{
2275 struct packed_git
*p
;
2279 struct delta_base_cache_entry
{
2280 struct hashmap hash
;
2281 struct delta_base_cache_key key
;
2282 struct list_head lru
;
2285 enum object_type type
;
2288 static unsigned int pack_entry_hash(struct packed_git
*p
, off_t base_offset
)
2292 hash
= (unsigned int)(intptr_t)p
+ (unsigned int)base_offset
;
2293 hash
+= (hash
>> 8) + (hash
>> 16);
2297 static struct delta_base_cache_entry
*
2298 get_delta_base_cache_entry(struct packed_git
*p
, off_t base_offset
)
2300 struct hashmap_entry entry
;
2301 struct delta_base_cache_key key
;
2303 if (!delta_base_cache
.cmpfn
)
2306 hashmap_entry_init(&entry
, pack_entry_hash(p
, base_offset
));
2308 key
.base_offset
= base_offset
;
2309 return hashmap_get(&delta_base_cache
, &entry
, &key
);
2312 static int delta_base_cache_key_eq(const struct delta_base_cache_key
*a
,
2313 const struct delta_base_cache_key
*b
)
2315 return a
->p
== b
->p
&& a
->base_offset
== b
->base_offset
;
2318 static int delta_base_cache_hash_cmp(const void *va
, const void *vb
,
2321 const struct delta_base_cache_entry
*a
= va
, *b
= vb
;
2322 const struct delta_base_cache_key
*key
= vkey
;
2324 return !delta_base_cache_key_eq(&a
->key
, key
);
2326 return !delta_base_cache_key_eq(&a
->key
, &b
->key
);
2329 static int in_delta_base_cache(struct packed_git
*p
, off_t base_offset
)
2331 return !!get_delta_base_cache_entry(p
, base_offset
);
2335 * Remove the entry from the cache, but do _not_ free the associated
2336 * entry data. The caller takes ownership of the "data" buffer, and
2337 * should copy out any fields it wants before detaching.
2339 static void detach_delta_base_cache_entry(struct delta_base_cache_entry
*ent
)
2341 hashmap_remove(&delta_base_cache
, ent
, &ent
->key
);
2342 list_del(&ent
->lru
);
2343 delta_base_cached
-= ent
->size
;
2347 static void *cache_or_unpack_entry(struct packed_git
*p
, off_t base_offset
,
2348 unsigned long *base_size
, enum object_type
*type
)
2350 struct delta_base_cache_entry
*ent
;
2352 ent
= get_delta_base_cache_entry(p
, base_offset
);
2354 return unpack_entry(p
, base_offset
, type
, base_size
);
2357 *base_size
= ent
->size
;
2358 return xmemdupz(ent
->data
, ent
->size
);
2361 static inline void release_delta_base_cache(struct delta_base_cache_entry
*ent
)
2364 detach_delta_base_cache_entry(ent
);
2367 void clear_delta_base_cache(void)
2369 struct list_head
*lru
, *tmp
;
2370 list_for_each_safe(lru
, tmp
, &delta_base_cache_lru
) {
2371 struct delta_base_cache_entry
*entry
=
2372 list_entry(lru
, struct delta_base_cache_entry
, lru
);
2373 release_delta_base_cache(entry
);
2377 static void add_delta_base_cache(struct packed_git
*p
, off_t base_offset
,
2378 void *base
, unsigned long base_size
, enum object_type type
)
2380 struct delta_base_cache_entry
*ent
= xmalloc(sizeof(*ent
));
2381 struct list_head
*lru
, *tmp
;
2383 delta_base_cached
+= base_size
;
2385 list_for_each_safe(lru
, tmp
, &delta_base_cache_lru
) {
2386 struct delta_base_cache_entry
*f
=
2387 list_entry(lru
, struct delta_base_cache_entry
, lru
);
2388 if (delta_base_cached
<= delta_base_cache_limit
)
2390 release_delta_base_cache(f
);
2394 ent
->key
.base_offset
= base_offset
;
2397 ent
->size
= base_size
;
2398 list_add_tail(&ent
->lru
, &delta_base_cache_lru
);
2400 if (!delta_base_cache
.cmpfn
)
2401 hashmap_init(&delta_base_cache
, delta_base_cache_hash_cmp
, 0);
2402 hashmap_entry_init(ent
, pack_entry_hash(p
, base_offset
));
2403 hashmap_add(&delta_base_cache
, ent
);
2406 static void *read_object(const unsigned char *sha1
, enum object_type
*type
,
2407 unsigned long *size
);
2409 static void write_pack_access_log(struct packed_git
*p
, off_t obj_offset
)
2411 static struct trace_key pack_access
= TRACE_KEY_INIT(PACK_ACCESS
);
2412 trace_printf_key(&pack_access
, "%s %"PRIuMAX
"\n",
2413 p
->pack_name
, (uintmax_t)obj_offset
);
2416 int do_check_packed_object_crc
;
2418 #define UNPACK_ENTRY_STACK_PREALLOC 64
2419 struct unpack_entry_stack_ent
{
2425 void *unpack_entry(struct packed_git
*p
, off_t obj_offset
,
2426 enum object_type
*final_type
, unsigned long *final_size
)
2428 struct pack_window
*w_curs
= NULL
;
2429 off_t curpos
= obj_offset
;
2432 enum object_type type
;
2433 struct unpack_entry_stack_ent small_delta_stack
[UNPACK_ENTRY_STACK_PREALLOC
];
2434 struct unpack_entry_stack_ent
*delta_stack
= small_delta_stack
;
2435 int delta_stack_nr
= 0, delta_stack_alloc
= UNPACK_ENTRY_STACK_PREALLOC
;
2436 int base_from_cache
= 0;
2438 write_pack_access_log(p
, obj_offset
);
2440 /* PHASE 1: drill down to the innermost base object */
2444 struct delta_base_cache_entry
*ent
;
2446 ent
= get_delta_base_cache_entry(p
, curpos
);
2451 detach_delta_base_cache_entry(ent
);
2452 base_from_cache
= 1;
2456 if (do_check_packed_object_crc
&& p
->index_version
> 1) {
2457 struct revindex_entry
*revidx
= find_pack_revindex(p
, obj_offset
);
2458 off_t len
= revidx
[1].offset
- obj_offset
;
2459 if (check_pack_crc(p
, &w_curs
, obj_offset
, len
, revidx
->nr
)) {
2460 const unsigned char *sha1
=
2461 nth_packed_object_sha1(p
, revidx
->nr
);
2462 error("bad packed object CRC for %s",
2464 mark_bad_packed_object(p
, sha1
);
2465 unuse_pack(&w_curs
);
2470 type
= unpack_object_header(p
, &w_curs
, &curpos
, &size
);
2471 if (type
!= OBJ_OFS_DELTA
&& type
!= OBJ_REF_DELTA
)
2474 base_offset
= get_delta_base(p
, &w_curs
, &curpos
, type
, obj_offset
);
2476 error("failed to validate delta base reference "
2477 "at offset %"PRIuMAX
" from %s",
2478 (uintmax_t)curpos
, p
->pack_name
);
2479 /* bail to phase 2, in hopes of recovery */
2484 /* push object, proceed to base */
2485 if (delta_stack_nr
>= delta_stack_alloc
2486 && delta_stack
== small_delta_stack
) {
2487 delta_stack_alloc
= alloc_nr(delta_stack_nr
);
2488 ALLOC_ARRAY(delta_stack
, delta_stack_alloc
);
2489 memcpy(delta_stack
, small_delta_stack
,
2490 sizeof(*delta_stack
)*delta_stack_nr
);
2492 ALLOC_GROW(delta_stack
, delta_stack_nr
+1, delta_stack_alloc
);
2494 i
= delta_stack_nr
++;
2495 delta_stack
[i
].obj_offset
= obj_offset
;
2496 delta_stack
[i
].curpos
= curpos
;
2497 delta_stack
[i
].size
= size
;
2499 curpos
= obj_offset
= base_offset
;
2502 /* PHASE 2: handle the base */
2507 die("BUG: unpack_entry: left loop at a valid delta");
2513 if (!base_from_cache
)
2514 data
= unpack_compressed_entry(p
, &w_curs
, curpos
, size
);
2518 error("unknown object type %i at offset %"PRIuMAX
" in %s",
2519 type
, (uintmax_t)obj_offset
, p
->pack_name
);
2522 /* PHASE 3: apply deltas in order */
2525 * 'data' holds the base data, or NULL if there was corruption
2527 while (delta_stack_nr
) {
2530 void *external_base
= NULL
;
2531 unsigned long delta_size
, base_size
= size
;
2537 add_delta_base_cache(p
, obj_offset
, base
, base_size
, type
);
2541 * We're probably in deep shit, but let's try to fetch
2542 * the required base anyway from another pack or loose.
2543 * This is costly but should happen only in the presence
2544 * of a corrupted pack, and is better than failing outright.
2546 struct revindex_entry
*revidx
;
2547 const unsigned char *base_sha1
;
2548 revidx
= find_pack_revindex(p
, obj_offset
);
2550 base_sha1
= nth_packed_object_sha1(p
, revidx
->nr
);
2551 error("failed to read delta base object %s"
2552 " at offset %"PRIuMAX
" from %s",
2553 sha1_to_hex(base_sha1
), (uintmax_t)obj_offset
,
2555 mark_bad_packed_object(p
, base_sha1
);
2556 base
= read_object(base_sha1
, &type
, &base_size
);
2557 external_base
= base
;
2561 i
= --delta_stack_nr
;
2562 obj_offset
= delta_stack
[i
].obj_offset
;
2563 curpos
= delta_stack
[i
].curpos
;
2564 delta_size
= delta_stack
[i
].size
;
2569 delta_data
= unpack_compressed_entry(p
, &w_curs
, curpos
, delta_size
);
2572 error("failed to unpack compressed delta "
2573 "at offset %"PRIuMAX
" from %s",
2574 (uintmax_t)curpos
, p
->pack_name
);
2576 free(external_base
);
2580 data
= patch_delta(base
, base_size
,
2581 delta_data
, delta_size
,
2585 * We could not apply the delta; warn the user, but keep going.
2586 * Our failure will be noticed either in the next iteration of
2587 * the loop, or if this is the final delta, in the caller when
2588 * we return NULL. Those code paths will take care of making
2589 * a more explicit warning and retrying with another copy of
2593 error("failed to apply delta");
2596 free(external_base
);
2602 unuse_pack(&w_curs
);
2604 if (delta_stack
!= small_delta_stack
)
2610 const unsigned char *nth_packed_object_sha1(struct packed_git
*p
,
2613 const unsigned char *index
= p
->index_data
;
2615 if (open_pack_index(p
))
2617 index
= p
->index_data
;
2619 if (n
>= p
->num_objects
)
2622 if (p
->index_version
== 1) {
2623 return index
+ 24 * n
+ 4;
2626 return index
+ 20 * n
;
2630 void check_pack_index_ptr(const struct packed_git
*p
, const void *vptr
)
2632 const unsigned char *ptr
= vptr
;
2633 const unsigned char *start
= p
->index_data
;
2634 const unsigned char *end
= start
+ p
->index_size
;
2636 die(_("offset before start of pack index for %s (corrupt index?)"),
2638 /* No need to check for underflow; .idx files must be at least 8 bytes */
2640 die(_("offset beyond end of pack index for %s (truncated index?)"),
2644 off_t
nth_packed_object_offset(const struct packed_git
*p
, uint32_t n
)
2646 const unsigned char *index
= p
->index_data
;
2648 if (p
->index_version
== 1) {
2649 return ntohl(*((uint32_t *)(index
+ 24 * n
)));
2652 index
+= 8 + p
->num_objects
* (20 + 4);
2653 off
= ntohl(*((uint32_t *)(index
+ 4 * n
)));
2654 if (!(off
& 0x80000000))
2656 index
+= p
->num_objects
* 4 + (off
& 0x7fffffff) * 8;
2657 check_pack_index_ptr(p
, index
);
2658 return (((uint64_t)ntohl(*((uint32_t *)(index
+ 0)))) << 32) |
2659 ntohl(*((uint32_t *)(index
+ 4)));
2663 off_t
find_pack_entry_one(const unsigned char *sha1
,
2664 struct packed_git
*p
)
2666 const uint32_t *level1_ofs
= p
->index_data
;
2667 const unsigned char *index
= p
->index_data
;
2668 unsigned hi
, lo
, stride
;
2669 static int use_lookup
= -1;
2670 static int debug_lookup
= -1;
2672 if (debug_lookup
< 0)
2673 debug_lookup
= !!getenv("GIT_DEBUG_LOOKUP");
2676 if (open_pack_index(p
))
2678 level1_ofs
= p
->index_data
;
2679 index
= p
->index_data
;
2681 if (p
->index_version
> 1) {
2686 hi
= ntohl(level1_ofs
[*sha1
]);
2687 lo
= ((*sha1
== 0x0) ? 0 : ntohl(level1_ofs
[*sha1
- 1]));
2688 if (p
->index_version
> 1) {
2696 printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32
"\n",
2697 sha1
[0], sha1
[1], sha1
[2], lo
, hi
, p
->num_objects
);
2700 use_lookup
= !!getenv("GIT_USE_LOOKUP");
2702 int pos
= sha1_entry_pos(index
, stride
, 0,
2703 lo
, hi
, p
->num_objects
, sha1
);
2706 return nth_packed_object_offset(p
, pos
);
2710 unsigned mi
= (lo
+ hi
) / 2;
2711 int cmp
= hashcmp(index
+ mi
* stride
, sha1
);
2714 printf("lo %u hi %u rg %u mi %u\n",
2715 lo
, hi
, hi
- lo
, mi
);
2717 return nth_packed_object_offset(p
, mi
);
2726 int is_pack_valid(struct packed_git
*p
)
2728 /* An already open pack is known to be valid. */
2729 if (p
->pack_fd
!= -1)
2732 /* If the pack has one window completely covering the
2733 * file size, the pack is known to be valid even if
2734 * the descriptor is not currently open.
2737 struct pack_window
*w
= p
->windows
;
2739 if (!w
->offset
&& w
->len
== p
->pack_size
)
2743 /* Force the pack to open to prove its valid. */
2744 return !open_packed_git(p
);
2747 static int fill_pack_entry(const unsigned char *sha1
,
2748 struct pack_entry
*e
,
2749 struct packed_git
*p
)
2753 if (p
->num_bad_objects
) {
2755 for (i
= 0; i
< p
->num_bad_objects
; i
++)
2756 if (!hashcmp(sha1
, p
->bad_object_sha1
+ 20 * i
))
2760 offset
= find_pack_entry_one(sha1
, p
);
2765 * We are about to tell the caller where they can locate the
2766 * requested object. We better make sure the packfile is
2767 * still here and can be accessed before supplying that
2768 * answer, as it may have been deleted since the index was
2771 if (!is_pack_valid(p
))
2775 hashcpy(e
->sha1
, sha1
);
2780 * Iff a pack file contains the object named by sha1, return true and
2781 * store its location to e.
2783 static int find_pack_entry(const unsigned char *sha1
, struct pack_entry
*e
)
2785 struct mru_entry
*p
;
2787 prepare_packed_git();
2791 for (p
= packed_git_mru
->head
; p
; p
= p
->next
) {
2792 if (fill_pack_entry(sha1
, e
, p
->item
)) {
2793 mru_mark(packed_git_mru
, p
);
2800 struct packed_git
*find_sha1_pack(const unsigned char *sha1
,
2801 struct packed_git
*packs
)
2803 struct packed_git
*p
;
2805 for (p
= packs
; p
; p
= p
->next
) {
2806 if (find_pack_entry_one(sha1
, p
))
2813 static int sha1_loose_object_info(const unsigned char *sha1
,
2814 struct object_info
*oi
,
2818 unsigned long mapsize
;
2822 struct strbuf hdrbuf
= STRBUF_INIT
;
2824 if (oi
->delta_base_sha1
)
2825 hashclr(oi
->delta_base_sha1
);
2828 * If we don't care about type or size, then we don't
2829 * need to look inside the object at all. Note that we
2830 * do not optimize out the stat call, even if the
2831 * caller doesn't care about the disk-size, since our
2832 * return value implicitly indicates whether the
2833 * object even exists.
2835 if (!oi
->typep
&& !oi
->typename
&& !oi
->sizep
) {
2838 if (stat_sha1_file(sha1
, &st
, &path
) < 0)
2841 *oi
->disk_sizep
= st
.st_size
;
2845 map
= map_sha1_file(sha1
, &mapsize
);
2849 *oi
->disk_sizep
= mapsize
;
2850 if ((flags
& LOOKUP_UNKNOWN_OBJECT
)) {
2851 if (unpack_sha1_header_to_strbuf(&stream
, map
, mapsize
, hdr
, sizeof(hdr
), &hdrbuf
) < 0)
2852 status
= error("unable to unpack %s header with --allow-unknown-type",
2854 } else if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0)
2855 status
= error("unable to unpack %s header",
2859 else if (hdrbuf
.len
) {
2860 if ((status
= parse_sha1_header_extended(hdrbuf
.buf
, oi
, flags
)) < 0)
2861 status
= error("unable to parse %s header with --allow-unknown-type",
2863 } else if ((status
= parse_sha1_header_extended(hdr
, oi
, flags
)) < 0)
2864 status
= error("unable to parse %s header", sha1_to_hex(sha1
));
2865 git_inflate_end(&stream
);
2866 munmap(map
, mapsize
);
2867 if (status
&& oi
->typep
)
2868 *oi
->typep
= status
;
2869 strbuf_release(&hdrbuf
);
2873 int sha1_object_info_extended(const unsigned char *sha1
, struct object_info
*oi
, unsigned flags
)
2875 struct cached_object
*co
;
2876 struct pack_entry e
;
2878 enum object_type real_type
;
2879 const unsigned char *real
= lookup_replace_object_extended(sha1
, flags
);
2881 co
= find_cached_object(real
);
2884 *(oi
->typep
) = co
->type
;
2886 *(oi
->sizep
) = co
->size
;
2888 *(oi
->disk_sizep
) = 0;
2889 if (oi
->delta_base_sha1
)
2890 hashclr(oi
->delta_base_sha1
);
2892 strbuf_addstr(oi
->typename
, typename(co
->type
));
2893 oi
->whence
= OI_CACHED
;
2897 if (!find_pack_entry(real
, &e
)) {
2898 /* Most likely it's a loose object. */
2899 if (!sha1_loose_object_info(real
, oi
, flags
)) {
2900 oi
->whence
= OI_LOOSE
;
2904 /* Not a loose object; someone else may have just packed it. */
2905 reprepare_packed_git();
2906 if (!find_pack_entry(real
, &e
))
2911 * packed_object_info() does not follow the delta chain to
2912 * find out the real type, unless it is given oi->typep.
2914 if (oi
->typename
&& !oi
->typep
)
2915 oi
->typep
= &real_type
;
2917 rtype
= packed_object_info(e
.p
, e
.offset
, oi
);
2919 mark_bad_packed_object(e
.p
, real
);
2920 if (oi
->typep
== &real_type
)
2922 return sha1_object_info_extended(real
, oi
, 0);
2923 } else if (in_delta_base_cache(e
.p
, e
.offset
)) {
2924 oi
->whence
= OI_DBCACHED
;
2926 oi
->whence
= OI_PACKED
;
2927 oi
->u
.packed
.offset
= e
.offset
;
2928 oi
->u
.packed
.pack
= e
.p
;
2929 oi
->u
.packed
.is_delta
= (rtype
== OBJ_REF_DELTA
||
2930 rtype
== OBJ_OFS_DELTA
);
2933 strbuf_addstr(oi
->typename
, typename(*oi
->typep
));
2934 if (oi
->typep
== &real_type
)
2940 /* returns enum object_type or negative */
2941 int sha1_object_info(const unsigned char *sha1
, unsigned long *sizep
)
2943 enum object_type type
;
2944 struct object_info oi
= OBJECT_INFO_INIT
;
2948 if (sha1_object_info_extended(sha1
, &oi
, LOOKUP_REPLACE_OBJECT
) < 0)
2953 static void *read_packed_sha1(const unsigned char *sha1
,
2954 enum object_type
*type
, unsigned long *size
)
2956 struct pack_entry e
;
2959 if (!find_pack_entry(sha1
, &e
))
2961 data
= cache_or_unpack_entry(e
.p
, e
.offset
, size
, type
);
2964 * We're probably in deep shit, but let's try to fetch
2965 * the required object anyway from another pack or loose.
2966 * This should happen only in the presence of a corrupted
2967 * pack, and is better than failing outright.
2969 error("failed to read object %s at offset %"PRIuMAX
" from %s",
2970 sha1_to_hex(sha1
), (uintmax_t)e
.offset
, e
.p
->pack_name
);
2971 mark_bad_packed_object(e
.p
, sha1
);
2972 data
= read_object(sha1
, type
, size
);
2977 int pretend_sha1_file(void *buf
, unsigned long len
, enum object_type type
,
2978 unsigned char *sha1
)
2980 struct cached_object
*co
;
2982 hash_sha1_file(buf
, len
, typename(type
), sha1
);
2983 if (has_sha1_file(sha1
) || find_cached_object(sha1
))
2985 ALLOC_GROW(cached_objects
, cached_object_nr
+ 1, cached_object_alloc
);
2986 co
= &cached_objects
[cached_object_nr
++];
2989 co
->buf
= xmalloc(len
);
2990 memcpy(co
->buf
, buf
, len
);
2991 hashcpy(co
->sha1
, sha1
);
2995 static void *read_object(const unsigned char *sha1
, enum object_type
*type
,
2996 unsigned long *size
)
2998 unsigned long mapsize
;
3000 struct cached_object
*co
;
3002 co
= find_cached_object(sha1
);
3006 return xmemdupz(co
->buf
, co
->size
);
3009 buf
= read_packed_sha1(sha1
, type
, size
);
3012 map
= map_sha1_file(sha1
, &mapsize
);
3014 buf
= unpack_sha1_file(map
, mapsize
, type
, size
, sha1
);
3015 munmap(map
, mapsize
);
3018 reprepare_packed_git();
3019 return read_packed_sha1(sha1
, type
, size
);
3023 * This function dies on corrupt objects; the callers who want to
3024 * deal with them should arrange to call read_object() and give error
3025 * messages themselves.
3027 void *read_sha1_file_extended(const unsigned char *sha1
,
3028 enum object_type
*type
,
3029 unsigned long *size
,
3033 const struct packed_git
*p
;
3036 const unsigned char *repl
= lookup_replace_object_extended(sha1
, flag
);
3039 data
= read_object(repl
, type
, size
);
3043 if (errno
&& errno
!= ENOENT
)
3044 die_errno("failed to read object %s", sha1_to_hex(sha1
));
3046 /* die if we replaced an object with one that does not exist */
3048 die("replacement %s not found for %s",
3049 sha1_to_hex(repl
), sha1_to_hex(sha1
));
3051 if (!stat_sha1_file(repl
, &st
, &path
))
3052 die("loose object %s (stored in %s) is corrupt",
3053 sha1_to_hex(repl
), path
);
3055 if ((p
= has_packed_and_bad(repl
)) != NULL
)
3056 die("packed object %s (stored in %s) is corrupt",
3057 sha1_to_hex(repl
), p
->pack_name
);
3062 void *read_object_with_reference(const unsigned char *sha1
,
3063 const char *required_type_name
,
3064 unsigned long *size
,
3065 unsigned char *actual_sha1_return
)
3067 enum object_type type
, required_type
;
3069 unsigned long isize
;
3070 unsigned char actual_sha1
[20];
3072 required_type
= type_from_string(required_type_name
);
3073 hashcpy(actual_sha1
, sha1
);
3075 int ref_length
= -1;
3076 const char *ref_type
= NULL
;
3078 buffer
= read_sha1_file(actual_sha1
, &type
, &isize
);
3081 if (type
== required_type
) {
3083 if (actual_sha1_return
)
3084 hashcpy(actual_sha1_return
, actual_sha1
);
3087 /* Handle references */
3088 else if (type
== OBJ_COMMIT
)
3090 else if (type
== OBJ_TAG
)
3091 ref_type
= "object ";
3096 ref_length
= strlen(ref_type
);
3098 if (ref_length
+ 40 > isize
||
3099 memcmp(buffer
, ref_type
, ref_length
) ||
3100 get_sha1_hex((char *) buffer
+ ref_length
, actual_sha1
)) {
3105 /* Now we have the ID of the referred-to object in
3106 * actual_sha1. Check again. */
3110 static void write_sha1_file_prepare(const void *buf
, unsigned long len
,
3111 const char *type
, unsigned char *sha1
,
3112 char *hdr
, int *hdrlen
)
3116 /* Generate the header */
3117 *hdrlen
= xsnprintf(hdr
, *hdrlen
, "%s %lu", type
, len
)+1;
3121 git_SHA1_Update(&c
, hdr
, *hdrlen
);
3122 git_SHA1_Update(&c
, buf
, len
);
3123 git_SHA1_Final(sha1
, &c
);
3127 * Move the just written object into its final resting place.
3129 int finalize_object_file(const char *tmpfile
, const char *filename
)
3133 if (object_creation_mode
== OBJECT_CREATION_USES_RENAMES
)
3135 else if (link(tmpfile
, filename
))
3139 * Coda hack - coda doesn't like cross-directory links,
3140 * so we fall back to a rename, which will mean that it
3141 * won't be able to check collisions, but that's not a
3144 * The same holds for FAT formatted media.
3146 * When this succeeds, we just return. We have nothing
3149 if (ret
&& ret
!= EEXIST
) {
3151 if (!rename(tmpfile
, filename
))
3155 unlink_or_warn(tmpfile
);
3157 if (ret
!= EEXIST
) {
3158 return error_errno("unable to write sha1 filename %s", filename
);
3160 /* FIXME!!! Collision check here ? */
3164 if (adjust_shared_perm(filename
))
3165 return error("unable to set permission to '%s'", filename
);
3169 static int write_buffer(int fd
, const void *buf
, size_t len
)
3171 if (write_in_full(fd
, buf
, len
) < 0)
3172 return error_errno("file write error");
3176 int hash_sha1_file(const void *buf
, unsigned long len
, const char *type
,
3177 unsigned char *sha1
)
3180 int hdrlen
= sizeof(hdr
);
3181 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
3185 /* Finalize a file on disk, and close it. */
3186 static void close_sha1_file(int fd
)
3188 if (fsync_object_files
)
3189 fsync_or_die(fd
, "sha1 file");
3191 die_errno("error when closing sha1 file");
3194 /* Size of directory component, including the ending '/' */
3195 static inline int directory_size(const char *filename
)
3197 const char *s
= strrchr(filename
, '/');
3200 return s
- filename
+ 1;
3204 * This creates a temporary file in the same directory as the final
3207 * We want to avoid cross-directory filename renames, because those
3208 * can have problems on various filesystems (FAT, NFS, Coda).
3210 static int create_tmpfile(struct strbuf
*tmp
, const char *filename
)
3212 int fd
, dirlen
= directory_size(filename
);
3215 strbuf_add(tmp
, filename
, dirlen
);
3216 strbuf_addstr(tmp
, "tmp_obj_XXXXXX");
3217 fd
= git_mkstemp_mode(tmp
->buf
, 0444);
3218 if (fd
< 0 && dirlen
&& errno
== ENOENT
) {
3220 * Make sure the directory exists; note that the contents
3221 * of the buffer are undefined after mkstemp returns an
3222 * error, so we have to rewrite the whole buffer from
3226 strbuf_add(tmp
, filename
, dirlen
- 1);
3227 if (mkdir(tmp
->buf
, 0777) && errno
!= EEXIST
)
3229 if (adjust_shared_perm(tmp
->buf
))
3233 strbuf_addstr(tmp
, "/tmp_obj_XXXXXX");
3234 fd
= git_mkstemp_mode(tmp
->buf
, 0444);
3239 static int write_loose_object(const unsigned char *sha1
, char *hdr
, int hdrlen
,
3240 const void *buf
, unsigned long len
, time_t mtime
)
3243 unsigned char compressed
[4096];
3246 unsigned char parano_sha1
[20];
3247 static struct strbuf tmp_file
= STRBUF_INIT
;
3248 const char *filename
= sha1_file_name(sha1
);
3250 fd
= create_tmpfile(&tmp_file
, filename
);
3252 if (errno
== EACCES
)
3253 return error("insufficient permission for adding an object to repository database %s", get_object_directory());
3255 return error_errno("unable to create temporary file");
3259 git_deflate_init(&stream
, zlib_compression_level
);
3260 stream
.next_out
= compressed
;
3261 stream
.avail_out
= sizeof(compressed
);
3264 /* First header.. */
3265 stream
.next_in
= (unsigned char *)hdr
;
3266 stream
.avail_in
= hdrlen
;
3267 while (git_deflate(&stream
, 0) == Z_OK
)
3269 git_SHA1_Update(&c
, hdr
, hdrlen
);
3271 /* Then the data itself.. */
3272 stream
.next_in
= (void *)buf
;
3273 stream
.avail_in
= len
;
3275 unsigned char *in0
= stream
.next_in
;
3276 ret
= git_deflate(&stream
, Z_FINISH
);
3277 git_SHA1_Update(&c
, in0
, stream
.next_in
- in0
);
3278 if (write_buffer(fd
, compressed
, stream
.next_out
- compressed
) < 0)
3279 die("unable to write sha1 file");
3280 stream
.next_out
= compressed
;
3281 stream
.avail_out
= sizeof(compressed
);
3282 } while (ret
== Z_OK
);
3284 if (ret
!= Z_STREAM_END
)
3285 die("unable to deflate new object %s (%d)", sha1_to_hex(sha1
), ret
);
3286 ret
= git_deflate_end_gently(&stream
);
3288 die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1
), ret
);
3289 git_SHA1_Final(parano_sha1
, &c
);
3290 if (hashcmp(sha1
, parano_sha1
) != 0)
3291 die("confused by unstable object source data for %s", sha1_to_hex(sha1
));
3293 close_sha1_file(fd
);
3298 utb
.modtime
= mtime
;
3299 if (utime(tmp_file
.buf
, &utb
) < 0)
3300 warning_errno("failed utime() on %s", tmp_file
.buf
);
3303 return finalize_object_file(tmp_file
.buf
, filename
);
3306 static int freshen_loose_object(const unsigned char *sha1
)
3308 return check_and_freshen(sha1
, 1);
3311 static int freshen_packed_object(const unsigned char *sha1
)
3313 struct pack_entry e
;
3314 if (!find_pack_entry(sha1
, &e
))
3318 if (!freshen_file(e
.p
->pack_name
))
3324 int write_sha1_file(const void *buf
, unsigned long len
, const char *type
, unsigned char *sha1
)
3327 int hdrlen
= sizeof(hdr
);
3329 /* Normally if we have it in the pack then we do not bother writing
3330 * it out into .git/objects/??/?{38} file.
3332 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
3333 if (freshen_packed_object(sha1
) || freshen_loose_object(sha1
))
3335 return write_loose_object(sha1
, hdr
, hdrlen
, buf
, len
, 0);
3338 int hash_sha1_file_literally(const void *buf
, unsigned long len
, const char *type
,
3339 unsigned char *sha1
, unsigned flags
)
3342 int hdrlen
, status
= 0;
3344 /* type string, SP, %lu of the length plus NUL must fit this */
3345 hdrlen
= strlen(type
) + 32;
3346 header
= xmalloc(hdrlen
);
3347 write_sha1_file_prepare(buf
, len
, type
, sha1
, header
, &hdrlen
);
3349 if (!(flags
& HASH_WRITE_OBJECT
))
3351 if (freshen_packed_object(sha1
) || freshen_loose_object(sha1
))
3353 status
= write_loose_object(sha1
, header
, hdrlen
, buf
, len
, 0);
3360 int force_object_loose(const unsigned char *sha1
, time_t mtime
)
3364 enum object_type type
;
3369 if (has_loose_object(sha1
))
3371 buf
= read_packed_sha1(sha1
, &type
, &len
);
3373 return error("cannot read sha1_file for %s", sha1_to_hex(sha1
));
3374 hdrlen
= xsnprintf(hdr
, sizeof(hdr
), "%s %lu", typename(type
), len
) + 1;
3375 ret
= write_loose_object(sha1
, hdr
, hdrlen
, buf
, len
, mtime
);
3381 int has_pack_index(const unsigned char *sha1
)
3384 if (stat(sha1_pack_index_name(sha1
), &st
))
3389 int has_sha1_pack(const unsigned char *sha1
)
3391 struct pack_entry e
;
3392 return find_pack_entry(sha1
, &e
);
3395 int has_sha1_file_with_flags(const unsigned char *sha1
, int flags
)
3397 struct pack_entry e
;
3399 if (find_pack_entry(sha1
, &e
))
3401 if (has_loose_object(sha1
))
3403 if (flags
& HAS_SHA1_QUICK
)
3405 reprepare_packed_git();
3406 return find_pack_entry(sha1
, &e
);
3409 int has_object_file(const struct object_id
*oid
)
3411 return has_sha1_file(oid
->hash
);
3414 int has_object_file_with_flags(const struct object_id
*oid
, int flags
)
3416 return has_sha1_file_with_flags(oid
->hash
, flags
);
3419 static void check_tree(const void *buf
, size_t size
)
3421 struct tree_desc desc
;
3422 struct name_entry entry
;
3424 init_tree_desc(&desc
, buf
, size
);
3425 while (tree_entry(&desc
, &entry
))
3427 * tree_entry() will die() on malformed entries */
3431 static void check_commit(const void *buf
, size_t size
)
3434 memset(&c
, 0, sizeof(c
));
3435 if (parse_commit_buffer(&c
, buf
, size
))
3436 die("corrupt commit");
3439 static void check_tag(const void *buf
, size_t size
)
3442 memset(&t
, 0, sizeof(t
));
3443 if (parse_tag_buffer(&t
, buf
, size
))
3447 static int index_mem(unsigned char *sha1
, void *buf
, size_t size
,
3448 enum object_type type
,
3449 const char *path
, unsigned flags
)
3451 int ret
, re_allocated
= 0;
3452 int write_object
= flags
& HASH_WRITE_OBJECT
;
3458 * Convert blobs to git internal format
3460 if ((type
== OBJ_BLOB
) && path
) {
3461 struct strbuf nbuf
= STRBUF_INIT
;
3462 if (convert_to_git(path
, buf
, size
, &nbuf
,
3463 write_object
? safe_crlf
: SAFE_CRLF_FALSE
)) {
3464 buf
= strbuf_detach(&nbuf
, &size
);
3468 if (flags
& HASH_FORMAT_CHECK
) {
3469 if (type
== OBJ_TREE
)
3470 check_tree(buf
, size
);
3471 if (type
== OBJ_COMMIT
)
3472 check_commit(buf
, size
);
3473 if (type
== OBJ_TAG
)
3474 check_tag(buf
, size
);
3478 ret
= write_sha1_file(buf
, size
, typename(type
), sha1
);
3480 ret
= hash_sha1_file(buf
, size
, typename(type
), sha1
);
3486 static int index_stream_convert_blob(unsigned char *sha1
, int fd
,
3487 const char *path
, unsigned flags
)
3490 const int write_object
= flags
& HASH_WRITE_OBJECT
;
3491 struct strbuf sbuf
= STRBUF_INIT
;
3494 assert(would_convert_to_git_filter_fd(path
));
3496 convert_to_git_filter_fd(path
, fd
, &sbuf
,
3497 write_object
? safe_crlf
: SAFE_CRLF_FALSE
);
3500 ret
= write_sha1_file(sbuf
.buf
, sbuf
.len
, typename(OBJ_BLOB
),
3503 ret
= hash_sha1_file(sbuf
.buf
, sbuf
.len
, typename(OBJ_BLOB
),
3505 strbuf_release(&sbuf
);
3509 static int index_pipe(unsigned char *sha1
, int fd
, enum object_type type
,
3510 const char *path
, unsigned flags
)
3512 struct strbuf sbuf
= STRBUF_INIT
;
3515 if (strbuf_read(&sbuf
, fd
, 4096) >= 0)
3516 ret
= index_mem(sha1
, sbuf
.buf
, sbuf
.len
, type
, path
, flags
);
3519 strbuf_release(&sbuf
);
3523 #define SMALL_FILE_SIZE (32*1024)
3525 static int index_core(unsigned char *sha1
, int fd
, size_t size
,
3526 enum object_type type
, const char *path
,
3532 ret
= index_mem(sha1
, "", size
, type
, path
, flags
);
3533 } else if (size
<= SMALL_FILE_SIZE
) {
3534 char *buf
= xmalloc(size
);
3535 if (size
== read_in_full(fd
, buf
, size
))
3536 ret
= index_mem(sha1
, buf
, size
, type
, path
, flags
);
3538 ret
= error_errno("short read");
3541 void *buf
= xmmap(NULL
, size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
3542 ret
= index_mem(sha1
, buf
, size
, type
, path
, flags
);
3549 * This creates one packfile per large blob unless bulk-checkin
3550 * machinery is "plugged".
3552 * This also bypasses the usual "convert-to-git" dance, and that is on
3553 * purpose. We could write a streaming version of the converting
3554 * functions and insert that before feeding the data to fast-import
3555 * (or equivalent in-core API described above). However, that is
3556 * somewhat complicated, as we do not know the size of the filter
3557 * result, which we need to know beforehand when writing a git object.
3558 * Since the primary motivation for trying to stream from the working
3559 * tree file and to avoid mmaping it in core is to deal with large
3560 * binary blobs, they generally do not want to get any conversion, and
3561 * callers should avoid this code path when filters are requested.
3563 static int index_stream(unsigned char *sha1
, int fd
, size_t size
,
3564 enum object_type type
, const char *path
,
3567 return index_bulk_checkin(sha1
, fd
, size
, type
, path
, flags
);
3570 int index_fd(unsigned char *sha1
, int fd
, struct stat
*st
,
3571 enum object_type type
, const char *path
, unsigned flags
)
3576 * Call xsize_t() only when needed to avoid potentially unnecessary
3577 * die() for large files.
3579 if (type
== OBJ_BLOB
&& path
&& would_convert_to_git_filter_fd(path
))
3580 ret
= index_stream_convert_blob(sha1
, fd
, path
, flags
);
3581 else if (!S_ISREG(st
->st_mode
))
3582 ret
= index_pipe(sha1
, fd
, type
, path
, flags
);
3583 else if (st
->st_size
<= big_file_threshold
|| type
!= OBJ_BLOB
||
3584 (path
&& would_convert_to_git(path
)))
3585 ret
= index_core(sha1
, fd
, xsize_t(st
->st_size
), type
, path
,
3588 ret
= index_stream(sha1
, fd
, xsize_t(st
->st_size
), type
, path
,
3594 int index_path(unsigned char *sha1
, const char *path
, struct stat
*st
, unsigned flags
)
3597 struct strbuf sb
= STRBUF_INIT
;
3599 switch (st
->st_mode
& S_IFMT
) {
3601 fd
= open(path
, O_RDONLY
);
3603 return error_errno("open(\"%s\")", path
);
3604 if (index_fd(sha1
, fd
, st
, OBJ_BLOB
, path
, flags
) < 0)
3605 return error("%s: failed to insert into database",
3609 if (strbuf_readlink(&sb
, path
, st
->st_size
))
3610 return error_errno("readlink(\"%s\")", path
);
3611 if (!(flags
& HASH_WRITE_OBJECT
))
3612 hash_sha1_file(sb
.buf
, sb
.len
, blob_type
, sha1
);
3613 else if (write_sha1_file(sb
.buf
, sb
.len
, blob_type
, sha1
))
3614 return error("%s: failed to insert into database",
3616 strbuf_release(&sb
);
3619 return resolve_gitlink_ref(path
, "HEAD", sha1
);
3621 return error("%s: unsupported file type", path
);
3626 int read_pack_header(int fd
, struct pack_header
*header
)
3628 if (read_in_full(fd
, header
, sizeof(*header
)) < sizeof(*header
))
3629 /* "eof before pack header was fully read" */
3630 return PH_ERROR_EOF
;
3632 if (header
->hdr_signature
!= htonl(PACK_SIGNATURE
))
3633 /* "protocol error (pack signature mismatch detected)" */
3634 return PH_ERROR_PACK_SIGNATURE
;
3635 if (!pack_version_ok(header
->hdr_version
))
3636 /* "protocol error (pack version unsupported)" */
3637 return PH_ERROR_PROTOCOL
;
3641 void assert_sha1_type(const unsigned char *sha1
, enum object_type expect
)
3643 enum object_type type
= sha1_object_info(sha1
, NULL
);
3645 die("%s is not a valid object", sha1_to_hex(sha1
));
3647 die("%s is not a valid '%s' object", sha1_to_hex(sha1
),
3651 static int for_each_file_in_obj_subdir(int subdir_nr
,
3652 struct strbuf
*path
,
3653 each_loose_object_fn obj_cb
,
3654 each_loose_cruft_fn cruft_cb
,
3655 each_loose_subdir_fn subdir_cb
,
3658 size_t baselen
= path
->len
;
3659 DIR *dir
= opendir(path
->buf
);
3664 if (errno
== ENOENT
)
3666 return error_errno("unable to open %s", path
->buf
);
3669 while ((de
= readdir(dir
))) {
3670 if (is_dot_or_dotdot(de
->d_name
))
3673 strbuf_setlen(path
, baselen
);
3674 strbuf_addf(path
, "/%s", de
->d_name
);
3676 if (strlen(de
->d_name
) == 38) {
3678 unsigned char sha1
[20];
3680 snprintf(hex
, sizeof(hex
), "%02x%s",
3681 subdir_nr
, de
->d_name
);
3682 if (!get_sha1_hex(hex
, sha1
)) {
3684 r
= obj_cb(sha1
, path
->buf
, data
);
3693 r
= cruft_cb(de
->d_name
, path
->buf
, data
);
3700 strbuf_setlen(path
, baselen
);
3701 if (!r
&& subdir_cb
)
3702 r
= subdir_cb(subdir_nr
, path
->buf
, data
);
3707 int for_each_loose_file_in_objdir_buf(struct strbuf
*path
,
3708 each_loose_object_fn obj_cb
,
3709 each_loose_cruft_fn cruft_cb
,
3710 each_loose_subdir_fn subdir_cb
,
3713 size_t baselen
= path
->len
;
3717 for (i
= 0; i
< 256; i
++) {
3718 strbuf_addf(path
, "/%02x", i
);
3719 r
= for_each_file_in_obj_subdir(i
, path
, obj_cb
, cruft_cb
,
3721 strbuf_setlen(path
, baselen
);
3729 int for_each_loose_file_in_objdir(const char *path
,
3730 each_loose_object_fn obj_cb
,
3731 each_loose_cruft_fn cruft_cb
,
3732 each_loose_subdir_fn subdir_cb
,
3735 struct strbuf buf
= STRBUF_INIT
;
3738 strbuf_addstr(&buf
, path
);
3739 r
= for_each_loose_file_in_objdir_buf(&buf
, obj_cb
, cruft_cb
,
3741 strbuf_release(&buf
);
3746 struct loose_alt_odb_data
{
3747 each_loose_object_fn
*cb
;
3751 static int loose_from_alt_odb(struct alternate_object_database
*alt
,
3754 struct loose_alt_odb_data
*data
= vdata
;
3755 struct strbuf buf
= STRBUF_INIT
;
3758 strbuf_addstr(&buf
, alt
->path
);
3759 r
= for_each_loose_file_in_objdir_buf(&buf
,
3760 data
->cb
, NULL
, NULL
,
3762 strbuf_release(&buf
);
3766 int for_each_loose_object(each_loose_object_fn cb
, void *data
, unsigned flags
)
3768 struct loose_alt_odb_data alt
;
3771 r
= for_each_loose_file_in_objdir(get_object_directory(),
3772 cb
, NULL
, NULL
, data
);
3776 if (flags
& FOR_EACH_OBJECT_LOCAL_ONLY
)
3781 return foreach_alt_odb(loose_from_alt_odb
, &alt
);
3784 static int for_each_object_in_pack(struct packed_git
*p
, each_packed_object_fn cb
, void *data
)
3789 for (i
= 0; i
< p
->num_objects
; i
++) {
3790 const unsigned char *sha1
= nth_packed_object_sha1(p
, i
);
3793 return error("unable to get sha1 of object %u in %s",
3796 r
= cb(sha1
, p
, i
, data
);
3803 int for_each_packed_object(each_packed_object_fn cb
, void *data
, unsigned flags
)
3805 struct packed_git
*p
;
3807 int pack_errors
= 0;
3809 prepare_packed_git();
3810 for (p
= packed_git
; p
; p
= p
->next
) {
3811 if ((flags
& FOR_EACH_OBJECT_LOCAL_ONLY
) && !p
->pack_local
)
3813 if (open_pack_index(p
)) {
3817 r
= for_each_object_in_pack(p
, cb
, data
);
3821 return r
? r
: pack_errors
;
3824 static int check_stream_sha1(git_zstream
*stream
,
3828 const unsigned char *expected_sha1
)
3831 unsigned char real_sha1
[GIT_SHA1_RAWSZ
];
3832 unsigned char buf
[4096];
3833 unsigned long total_read
;
3837 git_SHA1_Update(&c
, hdr
, stream
->total_out
);
3840 * We already read some bytes into hdr, but the ones up to the NUL
3841 * do not count against the object's content size.
3843 total_read
= stream
->total_out
- strlen(hdr
) - 1;
3846 * This size comparison must be "<=" to read the final zlib packets;
3847 * see the comment in unpack_sha1_rest for details.
3849 while (total_read
<= size
&&
3850 (status
== Z_OK
|| status
== Z_BUF_ERROR
)) {
3851 stream
->next_out
= buf
;
3852 stream
->avail_out
= sizeof(buf
);
3853 if (size
- total_read
< stream
->avail_out
)
3854 stream
->avail_out
= size
- total_read
;
3855 status
= git_inflate(stream
, Z_FINISH
);
3856 git_SHA1_Update(&c
, buf
, stream
->next_out
- buf
);
3857 total_read
+= stream
->next_out
- buf
;
3859 git_inflate_end(stream
);
3861 if (status
!= Z_STREAM_END
) {
3862 error("corrupt loose object '%s'", sha1_to_hex(expected_sha1
));
3865 if (stream
->avail_in
) {
3866 error("garbage at end of loose object '%s'",
3867 sha1_to_hex(expected_sha1
));
3871 git_SHA1_Final(real_sha1
, &c
);
3872 if (hashcmp(expected_sha1
, real_sha1
)) {
3873 error("sha1 mismatch for %s (expected %s)", path
,
3874 sha1_to_hex(expected_sha1
));
3881 int read_loose_object(const char *path
,
3882 const unsigned char *expected_sha1
,
3883 enum object_type
*type
,
3884 unsigned long *size
,
3890 unsigned long mapsize
;
3896 map
= map_sha1_file_1(path
, NULL
, &mapsize
);
3898 error_errno("unable to mmap %s", path
);
3902 if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0) {
3903 error("unable to unpack header of %s", path
);
3907 *type
= parse_sha1_header(hdr
, size
);
3909 error("unable to parse header of %s", path
);
3910 git_inflate_end(&stream
);
3914 if (*type
== OBJ_BLOB
) {
3915 if (check_stream_sha1(&stream
, hdr
, *size
, path
, expected_sha1
) < 0)
3918 *contents
= unpack_sha1_rest(&stream
, hdr
, *size
, expected_sha1
);
3920 error("unable to unpack contents of %s", path
);
3921 git_inflate_end(&stream
);
3924 if (check_sha1_signature(expected_sha1
, *contents
,
3925 *size
, typename(*type
))) {
3926 error("sha1 mismatch for %s (expected %s)", path
,
3927 sha1_to_hex(expected_sha1
));
3933 ret
= 0; /* everything checks out */
3937 munmap(map
, mapsize
);