2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
6 * This handles basic git sha1 object files - packing, unpacking,
11 #include "string-list.h"
17 #include "run-command.h"
20 #include "tree-walk.h"
22 #include "pack-revindex.h"
23 #include "sha1-lookup.h"
24 #include "bulk-checkin.h"
25 #include "streaming.h"
29 #include "mergesort.h"
32 #include "fetch-object.h"
34 const unsigned char null_sha1
[GIT_MAX_RAWSZ
];
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
)) {
136 } else if (mkdir(path
, 0777)) {
137 if (errno
== EEXIST
&&
138 !stat(path
, &st
) && S_ISDIR(st
.st_mode
))
139 ; /* somebody created it since we checked */
140 else if (errno
== ENOENT
)
142 * Either mkdir() failed because
143 * somebody just pruned the containing
144 * directory, or stat() failed because
145 * the file that was in our way was
146 * just removed. Either way, inform
147 * the caller that it might be worth
153 } else if (adjust_shared_perm(path
)) {
156 *slash
= slash_character
;
161 enum scld_error
safe_create_leading_directories_const(const char *path
)
164 /* path points to cache entries, so xstrdup before messing with it */
165 char *buf
= xstrdup(path
);
166 enum scld_error result
= safe_create_leading_directories(buf
);
174 int raceproof_create_file(const char *path
, create_file_fn fn
, void *cb
)
177 * The number of times we will try to remove empty directories
178 * in the way of path. This is only 1 because if another
179 * process is racily creating directories that conflict with
180 * us, we don't want to fight against them.
182 int remove_directories_remaining
= 1;
185 * The number of times that we will try to create the
186 * directories containing path. We are willing to attempt this
187 * more than once, because another process could be trying to
188 * clean up empty directories at the same time as we are
189 * trying to create them.
191 int create_directories_remaining
= 3;
193 /* A scratch copy of path, filled lazily if we need it: */
194 struct strbuf path_copy
= STRBUF_INIT
;
207 if (errno
== EISDIR
&& remove_directories_remaining
-- > 0) {
209 * A directory is in the way. Maybe it is empty; try
213 strbuf_addstr(&path_copy
, path
);
215 if (!remove_dir_recursively(&path_copy
, REMOVE_DIR_EMPTY_ONLY
))
217 } else if (errno
== ENOENT
&& create_directories_remaining
-- > 0) {
219 * Maybe the containing directory didn't exist, or
220 * maybe it was just deleted by a process that is
221 * racing with us to clean up empty directories. Try
224 enum scld_error scld_result
;
227 strbuf_addstr(&path_copy
, path
);
230 scld_result
= safe_create_leading_directories(path_copy
.buf
);
231 if (scld_result
== SCLD_OK
)
233 } while (scld_result
== SCLD_VANISHED
&& create_directories_remaining
-- > 0);
237 strbuf_release(&path_copy
);
242 static void fill_sha1_path(struct strbuf
*buf
, const unsigned char *sha1
)
245 for (i
= 0; i
< 20; i
++) {
246 static char hex
[] = "0123456789abcdef";
247 unsigned int val
= sha1
[i
];
248 strbuf_addch(buf
, hex
[val
>> 4]);
249 strbuf_addch(buf
, hex
[val
& 0xf]);
251 strbuf_addch(buf
, '/');
255 const char *sha1_file_name(const unsigned char *sha1
)
257 static struct strbuf buf
= STRBUF_INIT
;
260 strbuf_addf(&buf
, "%s/", get_object_directory());
262 fill_sha1_path(&buf
, sha1
);
266 struct strbuf
*alt_scratch_buf(struct alternate_object_database
*alt
)
268 strbuf_setlen(&alt
->scratch
, alt
->base_len
);
269 return &alt
->scratch
;
272 static const char *alt_sha1_path(struct alternate_object_database
*alt
,
273 const unsigned char *sha1
)
275 struct strbuf
*buf
= alt_scratch_buf(alt
);
276 fill_sha1_path(buf
, sha1
);
280 struct alternate_object_database
*alt_odb_list
;
281 static struct alternate_object_database
**alt_odb_tail
;
284 * Return non-zero iff the path is usable as an alternate object database.
286 static int alt_odb_usable(struct strbuf
*path
, const char *normalized_objdir
)
288 struct alternate_object_database
*alt
;
290 /* Detect cases where alternate disappeared */
291 if (!is_directory(path
->buf
)) {
292 error("object directory %s does not exist; "
293 "check .git/objects/info/alternates.",
299 * Prevent the common mistake of listing the same
300 * thing twice, or object directory itself.
302 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
303 if (!fspathcmp(path
->buf
, alt
->path
))
306 if (!fspathcmp(path
->buf
, normalized_objdir
))
313 * Prepare alternate object database registry.
315 * The variable alt_odb_list points at the list of struct
316 * alternate_object_database. The elements on this list come from
317 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
318 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
319 * whose contents is similar to that environment variable but can be
320 * LF separated. Its base points at a statically allocated buffer that
321 * contains "/the/directory/corresponding/to/.git/objects/...", while
322 * its name points just after the slash at the end of ".git/objects/"
323 * in the example above, and has enough space to hold 40-byte hex
324 * SHA1, an extra slash for the first level indirection, and the
327 static void read_info_alternates(const char * relative_base
, int depth
);
328 static int link_alt_odb_entry(const char *entry
, const char *relative_base
,
329 int depth
, const char *normalized_objdir
)
331 struct alternate_object_database
*ent
;
332 struct strbuf pathbuf
= STRBUF_INIT
;
334 if (!is_absolute_path(entry
) && relative_base
) {
335 strbuf_realpath(&pathbuf
, relative_base
, 1);
336 strbuf_addch(&pathbuf
, '/');
338 strbuf_addstr(&pathbuf
, entry
);
340 if (strbuf_normalize_path(&pathbuf
) < 0 && relative_base
) {
341 error("unable to normalize alternate object path: %s",
343 strbuf_release(&pathbuf
);
348 * The trailing slash after the directory name is given by
349 * this function at the end. Remove duplicates.
351 while (pathbuf
.len
&& pathbuf
.buf
[pathbuf
.len
- 1] == '/')
352 strbuf_setlen(&pathbuf
, pathbuf
.len
- 1);
354 if (!alt_odb_usable(&pathbuf
, normalized_objdir
)) {
355 strbuf_release(&pathbuf
);
359 ent
= alloc_alt_odb(pathbuf
.buf
);
361 /* add the alternate entry */
363 alt_odb_tail
= &(ent
->next
);
366 /* recursively add alternates */
367 read_info_alternates(pathbuf
.buf
, depth
+ 1);
369 strbuf_release(&pathbuf
);
373 static const char *parse_alt_odb_entry(const char *string
,
381 if (*string
== '#') {
382 /* comment; consume up to next separator */
383 end
= strchrnul(string
, sep
);
384 } else if (*string
== '"' && !unquote_c_style(out
, string
, &end
)) {
386 * quoted path; unquote_c_style has copied the
387 * data for us and set "end". Broken quoting (e.g.,
388 * an entry that doesn't end with a quote) falls
389 * back to the unquoted case below.
392 /* normal, unquoted path */
393 end
= strchrnul(string
, sep
);
394 strbuf_add(out
, string
, end
- string
);
402 static void link_alt_odb_entries(const char *alt
, int sep
,
403 const char *relative_base
, int depth
)
405 struct strbuf objdirbuf
= STRBUF_INIT
;
406 struct strbuf entry
= STRBUF_INIT
;
409 error("%s: ignoring alternate object stores, nesting too deep.",
414 strbuf_add_absolute_path(&objdirbuf
, get_object_directory());
415 if (strbuf_normalize_path(&objdirbuf
) < 0)
416 die("unable to normalize object directory: %s",
420 alt
= parse_alt_odb_entry(alt
, sep
, &entry
);
423 link_alt_odb_entry(entry
.buf
, relative_base
, depth
, objdirbuf
.buf
);
425 strbuf_release(&entry
);
426 strbuf_release(&objdirbuf
);
429 static void read_info_alternates(const char * relative_base
, int depth
)
432 struct strbuf buf
= STRBUF_INIT
;
434 path
= xstrfmt("%s/info/alternates", relative_base
);
435 if (strbuf_read_file(&buf
, path
, 1024) < 0) {
436 warn_on_fopen_errors(path
);
441 link_alt_odb_entries(buf
.buf
, '\n', relative_base
, depth
);
442 strbuf_release(&buf
);
446 struct alternate_object_database
*alloc_alt_odb(const char *dir
)
448 struct alternate_object_database
*ent
;
450 FLEX_ALLOC_STR(ent
, path
, dir
);
451 strbuf_init(&ent
->scratch
, 0);
452 strbuf_addf(&ent
->scratch
, "%s/", dir
);
453 ent
->base_len
= ent
->scratch
.len
;
458 void add_to_alternates_file(const char *reference
)
460 struct lock_file
*lock
= xcalloc(1, sizeof(struct lock_file
));
461 char *alts
= git_pathdup("objects/info/alternates");
464 hold_lock_file_for_update(lock
, alts
, LOCK_DIE_ON_ERROR
);
465 out
= fdopen_lock_file(lock
, "w");
467 die_errno("unable to fdopen alternates lockfile");
469 in
= fopen(alts
, "r");
471 struct strbuf line
= STRBUF_INIT
;
474 while (strbuf_getline(&line
, in
) != EOF
) {
475 if (!strcmp(reference
, line
.buf
)) {
479 fprintf_or_die(out
, "%s\n", line
.buf
);
482 strbuf_release(&line
);
486 rollback_lock_file(lock
);
490 else if (errno
!= ENOENT
)
491 die_errno("unable to read alternates file");
494 fprintf_or_die(out
, "%s\n", reference
);
495 if (commit_lock_file(lock
))
496 die_errno("unable to move new alternates file into place");
498 link_alt_odb_entries(reference
, '\n', NULL
, 0);
503 void add_to_alternates_memory(const char *reference
)
506 * Make sure alternates are initialized, or else our entry may be
507 * overwritten when they are.
511 link_alt_odb_entries(reference
, '\n', NULL
, 0);
515 * Compute the exact path an alternate is at and returns it. In case of
516 * error NULL is returned and the human readable error is added to `err`
517 * `path` may be relative and should point to $GITDIR.
518 * `err` must not be null.
520 char *compute_alternate_path(const char *path
, struct strbuf
*err
)
522 char *ref_git
= NULL
;
523 const char *repo
, *ref_git_s
;
526 ref_git_s
= real_path_if_valid(path
);
529 strbuf_addf(err
, _("path '%s' does not exist"), path
);
533 * Beware: read_gitfile(), real_path() and mkpath()
534 * return static buffer
536 ref_git
= xstrdup(ref_git_s
);
538 repo
= read_gitfile(ref_git
);
540 repo
= read_gitfile(mkpath("%s/.git", ref_git
));
543 ref_git
= xstrdup(repo
);
546 if (!repo
&& is_directory(mkpath("%s/.git/objects", ref_git
))) {
547 char *ref_git_git
= mkpathdup("%s/.git", ref_git
);
549 ref_git
= ref_git_git
;
550 } else if (!is_directory(mkpath("%s/objects", ref_git
))) {
551 struct strbuf sb
= STRBUF_INIT
;
553 if (get_common_dir(&sb
, ref_git
)) {
555 _("reference repository '%s' as a linked "
556 "checkout is not supported yet."),
561 strbuf_addf(err
, _("reference repository '%s' is not a "
562 "local repository."), path
);
566 if (!access(mkpath("%s/shallow", ref_git
), F_OK
)) {
567 strbuf_addf(err
, _("reference repository '%s' is shallow"),
573 if (!access(mkpath("%s/info/grafts", ref_git
), F_OK
)) {
575 _("reference repository '%s' is grafted"),
583 FREE_AND_NULL(ref_git
);
589 int foreach_alt_odb(alt_odb_fn fn
, void *cb
)
591 struct alternate_object_database
*ent
;
595 for (ent
= alt_odb_list
; ent
; ent
= ent
->next
) {
603 void prepare_alt_odb(void)
610 alt
= getenv(ALTERNATE_DB_ENVIRONMENT
);
613 alt_odb_tail
= &alt_odb_list
;
614 link_alt_odb_entries(alt
, PATH_SEP
, NULL
, 0);
616 read_info_alternates(get_object_directory(), 0);
619 /* Returns 1 if we have successfully freshened the file, 0 otherwise. */
620 static int freshen_file(const char *fn
)
623 t
.actime
= t
.modtime
= time(NULL
);
624 return !utime(fn
, &t
);
628 * All of the check_and_freshen functions return 1 if the file exists and was
629 * freshened (if freshening was requested), 0 otherwise. If they return
630 * 0, you should not assume that it is safe to skip a write of the object (it
631 * either does not exist on disk, or has a stale mtime and may be subject to
634 int check_and_freshen_file(const char *fn
, int freshen
)
636 if (access(fn
, F_OK
))
638 if (freshen
&& !freshen_file(fn
))
643 static int check_and_freshen_local(const unsigned char *sha1
, int freshen
)
645 return check_and_freshen_file(sha1_file_name(sha1
), freshen
);
648 static int check_and_freshen_nonlocal(const unsigned char *sha1
, int freshen
)
650 struct alternate_object_database
*alt
;
652 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
653 const char *path
= alt_sha1_path(alt
, sha1
);
654 if (check_and_freshen_file(path
, freshen
))
660 static int check_and_freshen(const unsigned char *sha1
, int freshen
)
662 return check_and_freshen_local(sha1
, freshen
) ||
663 check_and_freshen_nonlocal(sha1
, freshen
);
666 int has_loose_object_nonlocal(const unsigned char *sha1
)
668 return check_and_freshen_nonlocal(sha1
, 0);
671 static int has_loose_object(const unsigned char *sha1
)
673 return check_and_freshen(sha1
, 0);
676 static void mmap_limit_check(size_t length
)
678 static size_t limit
= 0;
680 limit
= git_env_ulong("GIT_MMAP_LIMIT", 0);
685 die("attempting to mmap %"PRIuMAX
" over limit %"PRIuMAX
,
686 (uintmax_t)length
, (uintmax_t)limit
);
689 void *xmmap_gently(void *start
, size_t length
,
690 int prot
, int flags
, int fd
, off_t offset
)
694 mmap_limit_check(length
);
695 ret
= mmap(start
, length
, prot
, flags
, fd
, offset
);
696 if (ret
== MAP_FAILED
) {
699 release_pack_memory(length
);
700 ret
= mmap(start
, length
, prot
, flags
, fd
, offset
);
705 void *xmmap(void *start
, size_t length
,
706 int prot
, int flags
, int fd
, off_t offset
)
708 void *ret
= xmmap_gently(start
, length
, prot
, flags
, fd
, offset
);
709 if (ret
== MAP_FAILED
)
710 die_errno("mmap failed");
715 * With an in-core object data in "map", rehash it to make sure the
716 * object name actually matches "sha1" to detect object corruption.
717 * With "map" == NULL, try reading the object named with "sha1" using
718 * the streaming interface and rehash it to do the same.
720 int check_sha1_signature(const unsigned char *sha1
, void *map
,
721 unsigned long size
, const char *type
)
723 unsigned char real_sha1
[20];
724 enum object_type obj_type
;
725 struct git_istream
*st
;
731 hash_sha1_file(map
, size
, type
, real_sha1
);
732 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
735 st
= open_istream(sha1
, &obj_type
, &size
, NULL
);
739 /* Generate the header */
740 hdrlen
= xsnprintf(hdr
, sizeof(hdr
), "%s %lu", typename(obj_type
), size
) + 1;
744 git_SHA1_Update(&c
, hdr
, hdrlen
);
747 ssize_t readlen
= read_istream(st
, buf
, sizeof(buf
));
755 git_SHA1_Update(&c
, buf
, readlen
);
757 git_SHA1_Final(real_sha1
, &c
);
759 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
762 int git_open_cloexec(const char *name
, int flags
)
765 static int o_cloexec
= O_CLOEXEC
;
767 fd
= open(name
, flags
| o_cloexec
);
768 if ((o_cloexec
& O_CLOEXEC
) && fd
< 0 && errno
== EINVAL
) {
769 /* Try again w/o O_CLOEXEC: the kernel might not support it */
770 o_cloexec
&= ~O_CLOEXEC
;
771 fd
= open(name
, flags
| o_cloexec
);
774 #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
776 static int fd_cloexec
= FD_CLOEXEC
;
778 if (!o_cloexec
&& 0 <= fd
&& fd_cloexec
) {
779 /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
780 int flags
= fcntl(fd
, F_GETFD
);
781 if (fcntl(fd
, F_SETFD
, flags
| fd_cloexec
))
790 * Find "sha1" as a loose object in the local repository or in an alternate.
791 * Returns 0 on success, negative on failure.
793 * The "path" out-parameter will give the path of the object we found (if any).
794 * Note that it may point to static storage and is only valid until another
795 * call to sha1_file_name(), etc.
797 static int stat_sha1_file(const unsigned char *sha1
, struct stat
*st
,
800 struct alternate_object_database
*alt
;
802 *path
= sha1_file_name(sha1
);
803 if (!lstat(*path
, st
))
808 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
809 *path
= alt_sha1_path(alt
, sha1
);
810 if (!lstat(*path
, st
))
818 * Like stat_sha1_file(), but actually open the object and return the
819 * descriptor. See the caveats on the "path" parameter above.
821 static int open_sha1_file(const unsigned char *sha1
, const char **path
)
824 struct alternate_object_database
*alt
;
825 int most_interesting_errno
;
827 *path
= sha1_file_name(sha1
);
828 fd
= git_open(*path
);
831 most_interesting_errno
= errno
;
834 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
835 *path
= alt_sha1_path(alt
, sha1
);
836 fd
= git_open(*path
);
839 if (most_interesting_errno
== ENOENT
)
840 most_interesting_errno
= errno
;
842 errno
= most_interesting_errno
;
847 * Map the loose object at "path" if it is not NULL, or the path found by
848 * searching for a loose object named "sha1".
850 static void *map_sha1_file_1(const char *path
,
851 const unsigned char *sha1
,
860 fd
= open_sha1_file(sha1
, &path
);
865 if (!fstat(fd
, &st
)) {
866 *size
= xsize_t(st
.st_size
);
868 /* mmap() is forbidden on empty files */
869 error("object file %s is empty", path
);
872 map
= xmmap(NULL
, *size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
879 void *map_sha1_file(const unsigned char *sha1
, unsigned long *size
)
881 return map_sha1_file_1(NULL
, sha1
, size
);
884 static int unpack_sha1_short_header(git_zstream
*stream
,
885 unsigned char *map
, unsigned long mapsize
,
886 void *buffer
, unsigned long bufsiz
)
888 /* Get the data stream */
889 memset(stream
, 0, sizeof(*stream
));
890 stream
->next_in
= map
;
891 stream
->avail_in
= mapsize
;
892 stream
->next_out
= buffer
;
893 stream
->avail_out
= bufsiz
;
895 git_inflate_init(stream
);
896 return git_inflate(stream
, 0);
899 int unpack_sha1_header(git_zstream
*stream
,
900 unsigned char *map
, unsigned long mapsize
,
901 void *buffer
, unsigned long bufsiz
)
903 int status
= unpack_sha1_short_header(stream
, map
, mapsize
,
909 /* Make sure we have the terminating NUL */
910 if (!memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
915 static int unpack_sha1_header_to_strbuf(git_zstream
*stream
, unsigned char *map
,
916 unsigned long mapsize
, void *buffer
,
917 unsigned long bufsiz
, struct strbuf
*header
)
921 status
= unpack_sha1_short_header(stream
, map
, mapsize
, buffer
, bufsiz
);
926 * Check if entire header is unpacked in the first iteration.
928 if (memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
932 * buffer[0..bufsiz] was not large enough. Copy the partial
933 * result out to header, and then append the result of further
934 * reading the stream.
936 strbuf_add(header
, buffer
, stream
->next_out
- (unsigned char *)buffer
);
937 stream
->next_out
= buffer
;
938 stream
->avail_out
= bufsiz
;
941 status
= git_inflate(stream
, 0);
942 strbuf_add(header
, buffer
, stream
->next_out
- (unsigned char *)buffer
);
943 if (memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
945 stream
->next_out
= buffer
;
946 stream
->avail_out
= bufsiz
;
947 } while (status
!= Z_STREAM_END
);
951 static void *unpack_sha1_rest(git_zstream
*stream
, void *buffer
, unsigned long size
, const unsigned char *sha1
)
953 int bytes
= strlen(buffer
) + 1;
954 unsigned char *buf
= xmallocz(size
);
958 n
= stream
->total_out
- bytes
;
961 memcpy(buf
, (char *) buffer
+ bytes
, n
);
965 * The above condition must be (bytes <= size), not
966 * (bytes < size). In other words, even though we
967 * expect no more output and set avail_out to zero,
968 * the input zlib stream may have bytes that express
969 * "this concludes the stream", and we *do* want to
972 * Otherwise we would not be able to test that we
973 * consumed all the input to reach the expected size;
974 * we also want to check that zlib tells us that all
975 * went well with status == Z_STREAM_END at the end.
977 stream
->next_out
= buf
+ bytes
;
978 stream
->avail_out
= size
- bytes
;
979 while (status
== Z_OK
)
980 status
= git_inflate(stream
, Z_FINISH
);
982 if (status
== Z_STREAM_END
&& !stream
->avail_in
) {
983 git_inflate_end(stream
);
988 error("corrupt loose object '%s'", sha1_to_hex(sha1
));
989 else if (stream
->avail_in
)
990 error("garbage at end of loose object '%s'",
997 * We used to just use "sscanf()", but that's actually way
998 * too permissive for what we want to check. So do an anal
999 * object header parse by hand.
1001 static int parse_sha1_header_extended(const char *hdr
, struct object_info
*oi
,
1004 const char *type_buf
= hdr
;
1006 int type
, type_len
= 0;
1009 * The type can be of any size but is followed by
1021 type
= type_from_string_gently(type_buf
, type_len
, 1);
1023 strbuf_add(oi
->typename
, type_buf
, type_len
);
1025 * Set type to 0 if its an unknown object and
1026 * we're obtaining the type using '--allow-unknown-type'
1029 if ((flags
& OBJECT_INFO_ALLOW_UNKNOWN_TYPE
) && (type
< 0))
1032 die("invalid object type");
1037 * The length must follow immediately, and be in canonical
1038 * decimal format (ie "010" is not valid).
1040 size
= *hdr
++ - '0';
1045 unsigned long c
= *hdr
- '0';
1049 size
= size
* 10 + c
;
1057 * The length must be followed by a zero byte
1059 return *hdr
? -1 : type
;
1062 int parse_sha1_header(const char *hdr
, unsigned long *sizep
)
1064 struct object_info oi
= OBJECT_INFO_INIT
;
1067 return parse_sha1_header_extended(hdr
, &oi
, 0);
1070 static int sha1_loose_object_info(const unsigned char *sha1
,
1071 struct object_info
*oi
,
1075 unsigned long mapsize
;
1079 struct strbuf hdrbuf
= STRBUF_INIT
;
1080 unsigned long size_scratch
;
1082 if (oi
->delta_base_sha1
)
1083 hashclr(oi
->delta_base_sha1
);
1086 * If we don't care about type or size, then we don't
1087 * need to look inside the object at all. Note that we
1088 * do not optimize out the stat call, even if the
1089 * caller doesn't care about the disk-size, since our
1090 * return value implicitly indicates whether the
1091 * object even exists.
1093 if (!oi
->typep
&& !oi
->typename
&& !oi
->sizep
&& !oi
->contentp
) {
1096 if (stat_sha1_file(sha1
, &st
, &path
) < 0)
1099 *oi
->disk_sizep
= st
.st_size
;
1103 map
= map_sha1_file(sha1
, &mapsize
);
1108 oi
->sizep
= &size_scratch
;
1111 *oi
->disk_sizep
= mapsize
;
1112 if ((flags
& OBJECT_INFO_ALLOW_UNKNOWN_TYPE
)) {
1113 if (unpack_sha1_header_to_strbuf(&stream
, map
, mapsize
, hdr
, sizeof(hdr
), &hdrbuf
) < 0)
1114 status
= error("unable to unpack %s header with --allow-unknown-type",
1116 } else if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0)
1117 status
= error("unable to unpack %s header",
1121 else if (hdrbuf
.len
) {
1122 if ((status
= parse_sha1_header_extended(hdrbuf
.buf
, oi
, flags
)) < 0)
1123 status
= error("unable to parse %s header with --allow-unknown-type",
1125 } else if ((status
= parse_sha1_header_extended(hdr
, oi
, flags
)) < 0)
1126 status
= error("unable to parse %s header", sha1_to_hex(sha1
));
1128 if (status
>= 0 && oi
->contentp
) {
1129 *oi
->contentp
= unpack_sha1_rest(&stream
, hdr
,
1131 if (!*oi
->contentp
) {
1132 git_inflate_end(&stream
);
1136 git_inflate_end(&stream
);
1138 munmap(map
, mapsize
);
1139 if (status
&& oi
->typep
)
1140 *oi
->typep
= status
;
1141 if (oi
->sizep
== &size_scratch
)
1143 strbuf_release(&hdrbuf
);
1144 oi
->whence
= OI_LOOSE
;
1145 return (status
< 0) ? status
: 0;
1148 int fetch_if_missing
= 1;
1150 int sha1_object_info_extended(const unsigned char *sha1
, struct object_info
*oi
, unsigned flags
)
1152 static struct object_info blank_oi
= OBJECT_INFO_INIT
;
1153 struct pack_entry e
;
1155 const unsigned char *real
= (flags
& OBJECT_INFO_LOOKUP_REPLACE
) ?
1156 lookup_replace_object(sha1
) :
1158 int already_retried
= 0;
1163 if (!(flags
& OBJECT_INFO_SKIP_CACHED
)) {
1164 struct cached_object
*co
= find_cached_object(real
);
1167 *(oi
->typep
) = co
->type
;
1169 *(oi
->sizep
) = co
->size
;
1171 *(oi
->disk_sizep
) = 0;
1172 if (oi
->delta_base_sha1
)
1173 hashclr(oi
->delta_base_sha1
);
1175 strbuf_addstr(oi
->typename
, typename(co
->type
));
1177 *oi
->contentp
= xmemdupz(co
->buf
, co
->size
);
1178 oi
->whence
= OI_CACHED
;
1184 if (find_pack_entry(real
, &e
))
1187 /* Most likely it's a loose object. */
1188 if (!sha1_loose_object_info(real
, oi
, flags
))
1191 /* Not a loose object; someone else may have just packed it. */
1192 reprepare_packed_git();
1193 if (find_pack_entry(real
, &e
))
1196 /* Check if it is a missing object */
1197 if (fetch_if_missing
&& repository_format_partial_clone
&&
1200 * TODO Investigate haveing fetch_object() return
1201 * TODO error/success and stopping the music here.
1203 fetch_object(repository_format_partial_clone
, real
);
1204 already_retried
= 1;
1211 if (oi
== &blank_oi
)
1213 * We know that the caller doesn't actually need the
1214 * information below, so return early.
1217 rtype
= packed_object_info(e
.p
, e
.offset
, oi
);
1219 mark_bad_packed_object(e
.p
, real
);
1220 return sha1_object_info_extended(real
, oi
, 0);
1221 } else if (oi
->whence
== OI_PACKED
) {
1222 oi
->u
.packed
.offset
= e
.offset
;
1223 oi
->u
.packed
.pack
= e
.p
;
1224 oi
->u
.packed
.is_delta
= (rtype
== OBJ_REF_DELTA
||
1225 rtype
== OBJ_OFS_DELTA
);
1231 /* returns enum object_type or negative */
1232 int sha1_object_info(const unsigned char *sha1
, unsigned long *sizep
)
1234 enum object_type type
;
1235 struct object_info oi
= OBJECT_INFO_INIT
;
1239 if (sha1_object_info_extended(sha1
, &oi
,
1240 OBJECT_INFO_LOOKUP_REPLACE
) < 0)
1245 static void *read_object(const unsigned char *sha1
, enum object_type
*type
,
1246 unsigned long *size
)
1248 struct object_info oi
= OBJECT_INFO_INIT
;
1252 oi
.contentp
= &content
;
1254 if (sha1_object_info_extended(sha1
, &oi
, 0) < 0)
1259 int pretend_sha1_file(void *buf
, unsigned long len
, enum object_type type
,
1260 unsigned char *sha1
)
1262 struct cached_object
*co
;
1264 hash_sha1_file(buf
, len
, typename(type
), sha1
);
1265 if (has_sha1_file(sha1
) || find_cached_object(sha1
))
1267 ALLOC_GROW(cached_objects
, cached_object_nr
+ 1, cached_object_alloc
);
1268 co
= &cached_objects
[cached_object_nr
++];
1271 co
->buf
= xmalloc(len
);
1272 memcpy(co
->buf
, buf
, len
);
1273 hashcpy(co
->sha1
, sha1
);
1278 * This function dies on corrupt objects; the callers who want to
1279 * deal with them should arrange to call read_object() and give error
1280 * messages themselves.
1282 void *read_sha1_file_extended(const unsigned char *sha1
,
1283 enum object_type
*type
,
1284 unsigned long *size
,
1288 const struct packed_git
*p
;
1291 const unsigned char *repl
= lookup_replace
? lookup_replace_object(sha1
)
1295 data
= read_object(repl
, type
, size
);
1299 if (errno
&& errno
!= ENOENT
)
1300 die_errno("failed to read object %s", sha1_to_hex(sha1
));
1302 /* die if we replaced an object with one that does not exist */
1304 die("replacement %s not found for %s",
1305 sha1_to_hex(repl
), sha1_to_hex(sha1
));
1307 if (!stat_sha1_file(repl
, &st
, &path
))
1308 die("loose object %s (stored in %s) is corrupt",
1309 sha1_to_hex(repl
), path
);
1311 if ((p
= has_packed_and_bad(repl
)) != NULL
)
1312 die("packed object %s (stored in %s) is corrupt",
1313 sha1_to_hex(repl
), p
->pack_name
);
1318 void *read_object_with_reference(const unsigned char *sha1
,
1319 const char *required_type_name
,
1320 unsigned long *size
,
1321 unsigned char *actual_sha1_return
)
1323 enum object_type type
, required_type
;
1325 unsigned long isize
;
1326 unsigned char actual_sha1
[20];
1328 required_type
= type_from_string(required_type_name
);
1329 hashcpy(actual_sha1
, sha1
);
1331 int ref_length
= -1;
1332 const char *ref_type
= NULL
;
1334 buffer
= read_sha1_file(actual_sha1
, &type
, &isize
);
1337 if (type
== required_type
) {
1339 if (actual_sha1_return
)
1340 hashcpy(actual_sha1_return
, actual_sha1
);
1343 /* Handle references */
1344 else if (type
== OBJ_COMMIT
)
1346 else if (type
== OBJ_TAG
)
1347 ref_type
= "object ";
1352 ref_length
= strlen(ref_type
);
1354 if (ref_length
+ 40 > isize
||
1355 memcmp(buffer
, ref_type
, ref_length
) ||
1356 get_sha1_hex((char *) buffer
+ ref_length
, actual_sha1
)) {
1361 /* Now we have the ID of the referred-to object in
1362 * actual_sha1. Check again. */
1366 static void write_sha1_file_prepare(const void *buf
, unsigned long len
,
1367 const char *type
, unsigned char *sha1
,
1368 char *hdr
, int *hdrlen
)
1372 /* Generate the header */
1373 *hdrlen
= xsnprintf(hdr
, *hdrlen
, "%s %lu", type
, len
)+1;
1377 git_SHA1_Update(&c
, hdr
, *hdrlen
);
1378 git_SHA1_Update(&c
, buf
, len
);
1379 git_SHA1_Final(sha1
, &c
);
1383 * Move the just written object into its final resting place.
1385 int finalize_object_file(const char *tmpfile
, const char *filename
)
1389 if (object_creation_mode
== OBJECT_CREATION_USES_RENAMES
)
1391 else if (link(tmpfile
, filename
))
1395 * Coda hack - coda doesn't like cross-directory links,
1396 * so we fall back to a rename, which will mean that it
1397 * won't be able to check collisions, but that's not a
1400 * The same holds for FAT formatted media.
1402 * When this succeeds, we just return. We have nothing
1405 if (ret
&& ret
!= EEXIST
) {
1407 if (!rename(tmpfile
, filename
))
1411 unlink_or_warn(tmpfile
);
1413 if (ret
!= EEXIST
) {
1414 return error_errno("unable to write sha1 filename %s", filename
);
1416 /* FIXME!!! Collision check here ? */
1420 if (adjust_shared_perm(filename
))
1421 return error("unable to set permission to '%s'", filename
);
1425 static int write_buffer(int fd
, const void *buf
, size_t len
)
1427 if (write_in_full(fd
, buf
, len
) < 0)
1428 return error_errno("file write error");
1432 int hash_sha1_file(const void *buf
, unsigned long len
, const char *type
,
1433 unsigned char *sha1
)
1436 int hdrlen
= sizeof(hdr
);
1437 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1441 /* Finalize a file on disk, and close it. */
1442 static void close_sha1_file(int fd
)
1444 if (fsync_object_files
)
1445 fsync_or_die(fd
, "sha1 file");
1447 die_errno("error when closing sha1 file");
1450 /* Size of directory component, including the ending '/' */
1451 static inline int directory_size(const char *filename
)
1453 const char *s
= strrchr(filename
, '/');
1456 return s
- filename
+ 1;
1460 * This creates a temporary file in the same directory as the final
1463 * We want to avoid cross-directory filename renames, because those
1464 * can have problems on various filesystems (FAT, NFS, Coda).
1466 static int create_tmpfile(struct strbuf
*tmp
, const char *filename
)
1468 int fd
, dirlen
= directory_size(filename
);
1471 strbuf_add(tmp
, filename
, dirlen
);
1472 strbuf_addstr(tmp
, "tmp_obj_XXXXXX");
1473 fd
= git_mkstemp_mode(tmp
->buf
, 0444);
1474 if (fd
< 0 && dirlen
&& errno
== ENOENT
) {
1476 * Make sure the directory exists; note that the contents
1477 * of the buffer are undefined after mkstemp returns an
1478 * error, so we have to rewrite the whole buffer from
1482 strbuf_add(tmp
, filename
, dirlen
- 1);
1483 if (mkdir(tmp
->buf
, 0777) && errno
!= EEXIST
)
1485 if (adjust_shared_perm(tmp
->buf
))
1489 strbuf_addstr(tmp
, "/tmp_obj_XXXXXX");
1490 fd
= git_mkstemp_mode(tmp
->buf
, 0444);
1495 static int write_loose_object(const unsigned char *sha1
, char *hdr
, int hdrlen
,
1496 const void *buf
, unsigned long len
, time_t mtime
)
1499 unsigned char compressed
[4096];
1502 unsigned char parano_sha1
[20];
1503 static struct strbuf tmp_file
= STRBUF_INIT
;
1504 const char *filename
= sha1_file_name(sha1
);
1506 fd
= create_tmpfile(&tmp_file
, filename
);
1508 if (errno
== EACCES
)
1509 return error("insufficient permission for adding an object to repository database %s", get_object_directory());
1511 return error_errno("unable to create temporary file");
1515 git_deflate_init(&stream
, zlib_compression_level
);
1516 stream
.next_out
= compressed
;
1517 stream
.avail_out
= sizeof(compressed
);
1520 /* First header.. */
1521 stream
.next_in
= (unsigned char *)hdr
;
1522 stream
.avail_in
= hdrlen
;
1523 while (git_deflate(&stream
, 0) == Z_OK
)
1525 git_SHA1_Update(&c
, hdr
, hdrlen
);
1527 /* Then the data itself.. */
1528 stream
.next_in
= (void *)buf
;
1529 stream
.avail_in
= len
;
1531 unsigned char *in0
= stream
.next_in
;
1532 ret
= git_deflate(&stream
, Z_FINISH
);
1533 git_SHA1_Update(&c
, in0
, stream
.next_in
- in0
);
1534 if (write_buffer(fd
, compressed
, stream
.next_out
- compressed
) < 0)
1535 die("unable to write sha1 file");
1536 stream
.next_out
= compressed
;
1537 stream
.avail_out
= sizeof(compressed
);
1538 } while (ret
== Z_OK
);
1540 if (ret
!= Z_STREAM_END
)
1541 die("unable to deflate new object %s (%d)", sha1_to_hex(sha1
), ret
);
1542 ret
= git_deflate_end_gently(&stream
);
1544 die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1
), ret
);
1545 git_SHA1_Final(parano_sha1
, &c
);
1546 if (hashcmp(sha1
, parano_sha1
) != 0)
1547 die("confused by unstable object source data for %s", sha1_to_hex(sha1
));
1549 close_sha1_file(fd
);
1554 utb
.modtime
= mtime
;
1555 if (utime(tmp_file
.buf
, &utb
) < 0)
1556 warning_errno("failed utime() on %s", tmp_file
.buf
);
1559 return finalize_object_file(tmp_file
.buf
, filename
);
1562 static int freshen_loose_object(const unsigned char *sha1
)
1564 return check_and_freshen(sha1
, 1);
1567 static int freshen_packed_object(const unsigned char *sha1
)
1569 struct pack_entry e
;
1570 if (!find_pack_entry(sha1
, &e
))
1574 if (!freshen_file(e
.p
->pack_name
))
1580 int write_sha1_file(const void *buf
, unsigned long len
, const char *type
, unsigned char *sha1
)
1583 int hdrlen
= sizeof(hdr
);
1585 /* Normally if we have it in the pack then we do not bother writing
1586 * it out into .git/objects/??/?{38} file.
1588 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1589 if (freshen_packed_object(sha1
) || freshen_loose_object(sha1
))
1591 return write_loose_object(sha1
, hdr
, hdrlen
, buf
, len
, 0);
1594 int hash_sha1_file_literally(const void *buf
, unsigned long len
, const char *type
,
1595 struct object_id
*oid
, unsigned flags
)
1598 int hdrlen
, status
= 0;
1600 /* type string, SP, %lu of the length plus NUL must fit this */
1601 hdrlen
= strlen(type
) + 32;
1602 header
= xmalloc(hdrlen
);
1603 write_sha1_file_prepare(buf
, len
, type
, oid
->hash
, header
, &hdrlen
);
1605 if (!(flags
& HASH_WRITE_OBJECT
))
1607 if (freshen_packed_object(oid
->hash
) || freshen_loose_object(oid
->hash
))
1609 status
= write_loose_object(oid
->hash
, header
, hdrlen
, buf
, len
, 0);
1616 int force_object_loose(const unsigned char *sha1
, time_t mtime
)
1620 enum object_type type
;
1625 if (has_loose_object(sha1
))
1627 buf
= read_object(sha1
, &type
, &len
);
1629 return error("cannot read sha1_file for %s", sha1_to_hex(sha1
));
1630 hdrlen
= xsnprintf(hdr
, sizeof(hdr
), "%s %lu", typename(type
), len
) + 1;
1631 ret
= write_loose_object(sha1
, hdr
, hdrlen
, buf
, len
, mtime
);
1637 int has_sha1_file_with_flags(const unsigned char *sha1
, int flags
)
1639 if (!startup_info
->have_repository
)
1641 return sha1_object_info_extended(sha1
, NULL
,
1642 flags
| OBJECT_INFO_SKIP_CACHED
) >= 0;
1645 int has_object_file(const struct object_id
*oid
)
1647 return has_sha1_file(oid
->hash
);
1650 int has_object_file_with_flags(const struct object_id
*oid
, int flags
)
1652 return has_sha1_file_with_flags(oid
->hash
, flags
);
1655 static void check_tree(const void *buf
, size_t size
)
1657 struct tree_desc desc
;
1658 struct name_entry entry
;
1660 init_tree_desc(&desc
, buf
, size
);
1661 while (tree_entry(&desc
, &entry
))
1663 * tree_entry() will die() on malformed entries */
1667 static void check_commit(const void *buf
, size_t size
)
1670 memset(&c
, 0, sizeof(c
));
1671 if (parse_commit_buffer(&c
, buf
, size
))
1672 die("corrupt commit");
1675 static void check_tag(const void *buf
, size_t size
)
1678 memset(&t
, 0, sizeof(t
));
1679 if (parse_tag_buffer(&t
, buf
, size
))
1683 static int index_mem(unsigned char *sha1
, void *buf
, size_t size
,
1684 enum object_type type
,
1685 const char *path
, unsigned flags
)
1687 int ret
, re_allocated
= 0;
1688 int write_object
= flags
& HASH_WRITE_OBJECT
;
1694 * Convert blobs to git internal format
1696 if ((type
== OBJ_BLOB
) && path
) {
1697 struct strbuf nbuf
= STRBUF_INIT
;
1698 if (convert_to_git(&the_index
, path
, buf
, size
, &nbuf
,
1699 write_object
? safe_crlf
: SAFE_CRLF_FALSE
)) {
1700 buf
= strbuf_detach(&nbuf
, &size
);
1704 if (flags
& HASH_FORMAT_CHECK
) {
1705 if (type
== OBJ_TREE
)
1706 check_tree(buf
, size
);
1707 if (type
== OBJ_COMMIT
)
1708 check_commit(buf
, size
);
1709 if (type
== OBJ_TAG
)
1710 check_tag(buf
, size
);
1714 ret
= write_sha1_file(buf
, size
, typename(type
), sha1
);
1716 ret
= hash_sha1_file(buf
, size
, typename(type
), sha1
);
1722 static int index_stream_convert_blob(unsigned char *sha1
, int fd
,
1723 const char *path
, unsigned flags
)
1726 const int write_object
= flags
& HASH_WRITE_OBJECT
;
1727 struct strbuf sbuf
= STRBUF_INIT
;
1730 assert(would_convert_to_git_filter_fd(path
));
1732 convert_to_git_filter_fd(&the_index
, path
, fd
, &sbuf
,
1733 write_object
? safe_crlf
: SAFE_CRLF_FALSE
);
1736 ret
= write_sha1_file(sbuf
.buf
, sbuf
.len
, typename(OBJ_BLOB
),
1739 ret
= hash_sha1_file(sbuf
.buf
, sbuf
.len
, typename(OBJ_BLOB
),
1741 strbuf_release(&sbuf
);
1745 static int index_pipe(unsigned char *sha1
, int fd
, enum object_type type
,
1746 const char *path
, unsigned flags
)
1748 struct strbuf sbuf
= STRBUF_INIT
;
1751 if (strbuf_read(&sbuf
, fd
, 4096) >= 0)
1752 ret
= index_mem(sha1
, sbuf
.buf
, sbuf
.len
, type
, path
, flags
);
1755 strbuf_release(&sbuf
);
1759 #define SMALL_FILE_SIZE (32*1024)
1761 static int index_core(unsigned char *sha1
, int fd
, size_t size
,
1762 enum object_type type
, const char *path
,
1768 ret
= index_mem(sha1
, "", size
, type
, path
, flags
);
1769 } else if (size
<= SMALL_FILE_SIZE
) {
1770 char *buf
= xmalloc(size
);
1771 ssize_t read_result
= read_in_full(fd
, buf
, size
);
1772 if (read_result
< 0)
1773 ret
= error_errno("read error while indexing %s",
1774 path
? path
: "<unknown>");
1775 else if (read_result
!= size
)
1776 ret
= error("short read while indexing %s",
1777 path
? path
: "<unknown>");
1779 ret
= index_mem(sha1
, buf
, size
, type
, path
, flags
);
1782 void *buf
= xmmap(NULL
, size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
1783 ret
= index_mem(sha1
, buf
, size
, type
, path
, flags
);
1790 * This creates one packfile per large blob unless bulk-checkin
1791 * machinery is "plugged".
1793 * This also bypasses the usual "convert-to-git" dance, and that is on
1794 * purpose. We could write a streaming version of the converting
1795 * functions and insert that before feeding the data to fast-import
1796 * (or equivalent in-core API described above). However, that is
1797 * somewhat complicated, as we do not know the size of the filter
1798 * result, which we need to know beforehand when writing a git object.
1799 * Since the primary motivation for trying to stream from the working
1800 * tree file and to avoid mmaping it in core is to deal with large
1801 * binary blobs, they generally do not want to get any conversion, and
1802 * callers should avoid this code path when filters are requested.
1804 static int index_stream(struct object_id
*oid
, int fd
, size_t size
,
1805 enum object_type type
, const char *path
,
1808 return index_bulk_checkin(oid
->hash
, fd
, size
, type
, path
, flags
);
1811 int index_fd(struct object_id
*oid
, int fd
, struct stat
*st
,
1812 enum object_type type
, const char *path
, unsigned flags
)
1817 * Call xsize_t() only when needed to avoid potentially unnecessary
1818 * die() for large files.
1820 if (type
== OBJ_BLOB
&& path
&& would_convert_to_git_filter_fd(path
))
1821 ret
= index_stream_convert_blob(oid
->hash
, fd
, path
, flags
);
1822 else if (!S_ISREG(st
->st_mode
))
1823 ret
= index_pipe(oid
->hash
, fd
, type
, path
, flags
);
1824 else if (st
->st_size
<= big_file_threshold
|| type
!= OBJ_BLOB
||
1825 (path
&& would_convert_to_git(&the_index
, path
)))
1826 ret
= index_core(oid
->hash
, fd
, xsize_t(st
->st_size
), type
, path
,
1829 ret
= index_stream(oid
, fd
, xsize_t(st
->st_size
), type
, path
,
1835 int index_path(struct object_id
*oid
, const char *path
, struct stat
*st
, unsigned flags
)
1838 struct strbuf sb
= STRBUF_INIT
;
1841 switch (st
->st_mode
& S_IFMT
) {
1843 fd
= open(path
, O_RDONLY
);
1845 return error_errno("open(\"%s\")", path
);
1846 if (index_fd(oid
, fd
, st
, OBJ_BLOB
, path
, flags
) < 0)
1847 return error("%s: failed to insert into database",
1851 if (strbuf_readlink(&sb
, path
, st
->st_size
))
1852 return error_errno("readlink(\"%s\")", path
);
1853 if (!(flags
& HASH_WRITE_OBJECT
))
1854 hash_sha1_file(sb
.buf
, sb
.len
, blob_type
, oid
->hash
);
1855 else if (write_sha1_file(sb
.buf
, sb
.len
, blob_type
, oid
->hash
))
1856 rc
= error("%s: failed to insert into database", path
);
1857 strbuf_release(&sb
);
1860 return resolve_gitlink_ref(path
, "HEAD", oid
->hash
);
1862 return error("%s: unsupported file type", path
);
1867 int read_pack_header(int fd
, struct pack_header
*header
)
1869 if (read_in_full(fd
, header
, sizeof(*header
)) != sizeof(*header
))
1870 /* "eof before pack header was fully read" */
1871 return PH_ERROR_EOF
;
1873 if (header
->hdr_signature
!= htonl(PACK_SIGNATURE
))
1874 /* "protocol error (pack signature mismatch detected)" */
1875 return PH_ERROR_PACK_SIGNATURE
;
1876 if (!pack_version_ok(header
->hdr_version
))
1877 /* "protocol error (pack version unsupported)" */
1878 return PH_ERROR_PROTOCOL
;
1882 void assert_sha1_type(const unsigned char *sha1
, enum object_type expect
)
1884 enum object_type type
= sha1_object_info(sha1
, NULL
);
1886 die("%s is not a valid object", sha1_to_hex(sha1
));
1888 die("%s is not a valid '%s' object", sha1_to_hex(sha1
),
1892 int for_each_file_in_obj_subdir(unsigned int subdir_nr
,
1893 struct strbuf
*path
,
1894 each_loose_object_fn obj_cb
,
1895 each_loose_cruft_fn cruft_cb
,
1896 each_loose_subdir_fn subdir_cb
,
1899 size_t origlen
, baselen
;
1904 if (subdir_nr
> 0xff)
1905 BUG("invalid loose object subdirectory: %x", subdir_nr
);
1907 origlen
= path
->len
;
1908 strbuf_complete(path
, '/');
1909 strbuf_addf(path
, "%02x", subdir_nr
);
1910 baselen
= path
->len
;
1912 dir
= opendir(path
->buf
);
1914 if (errno
!= ENOENT
)
1915 r
= error_errno("unable to open %s", path
->buf
);
1916 strbuf_setlen(path
, origlen
);
1920 while ((de
= readdir(dir
))) {
1921 if (is_dot_or_dotdot(de
->d_name
))
1924 strbuf_setlen(path
, baselen
);
1925 strbuf_addf(path
, "/%s", de
->d_name
);
1927 if (strlen(de
->d_name
) == GIT_SHA1_HEXSZ
- 2) {
1928 char hex
[GIT_MAX_HEXSZ
+1];
1929 struct object_id oid
;
1931 xsnprintf(hex
, sizeof(hex
), "%02x%s",
1932 subdir_nr
, de
->d_name
);
1933 if (!get_oid_hex(hex
, &oid
)) {
1935 r
= obj_cb(&oid
, path
->buf
, data
);
1944 r
= cruft_cb(de
->d_name
, path
->buf
, data
);
1951 strbuf_setlen(path
, baselen
);
1952 if (!r
&& subdir_cb
)
1953 r
= subdir_cb(subdir_nr
, path
->buf
, data
);
1955 strbuf_setlen(path
, origlen
);
1960 int for_each_loose_file_in_objdir_buf(struct strbuf
*path
,
1961 each_loose_object_fn obj_cb
,
1962 each_loose_cruft_fn cruft_cb
,
1963 each_loose_subdir_fn subdir_cb
,
1969 for (i
= 0; i
< 256; i
++) {
1970 r
= for_each_file_in_obj_subdir(i
, path
, obj_cb
, cruft_cb
,
1979 int for_each_loose_file_in_objdir(const char *path
,
1980 each_loose_object_fn obj_cb
,
1981 each_loose_cruft_fn cruft_cb
,
1982 each_loose_subdir_fn subdir_cb
,
1985 struct strbuf buf
= STRBUF_INIT
;
1988 strbuf_addstr(&buf
, path
);
1989 r
= for_each_loose_file_in_objdir_buf(&buf
, obj_cb
, cruft_cb
,
1991 strbuf_release(&buf
);
1996 struct loose_alt_odb_data
{
1997 each_loose_object_fn
*cb
;
2001 static int loose_from_alt_odb(struct alternate_object_database
*alt
,
2004 struct loose_alt_odb_data
*data
= vdata
;
2005 struct strbuf buf
= STRBUF_INIT
;
2008 strbuf_addstr(&buf
, alt
->path
);
2009 r
= for_each_loose_file_in_objdir_buf(&buf
,
2010 data
->cb
, NULL
, NULL
,
2012 strbuf_release(&buf
);
2016 int for_each_loose_object(each_loose_object_fn cb
, void *data
, unsigned flags
)
2018 struct loose_alt_odb_data alt
;
2021 r
= for_each_loose_file_in_objdir(get_object_directory(),
2022 cb
, NULL
, NULL
, data
);
2026 if (flags
& FOR_EACH_OBJECT_LOCAL_ONLY
)
2031 return foreach_alt_odb(loose_from_alt_odb
, &alt
);
2034 static int check_stream_sha1(git_zstream
*stream
,
2038 const unsigned char *expected_sha1
)
2041 unsigned char real_sha1
[GIT_MAX_RAWSZ
];
2042 unsigned char buf
[4096];
2043 unsigned long total_read
;
2047 git_SHA1_Update(&c
, hdr
, stream
->total_out
);
2050 * We already read some bytes into hdr, but the ones up to the NUL
2051 * do not count against the object's content size.
2053 total_read
= stream
->total_out
- strlen(hdr
) - 1;
2056 * This size comparison must be "<=" to read the final zlib packets;
2057 * see the comment in unpack_sha1_rest for details.
2059 while (total_read
<= size
&&
2060 (status
== Z_OK
|| status
== Z_BUF_ERROR
)) {
2061 stream
->next_out
= buf
;
2062 stream
->avail_out
= sizeof(buf
);
2063 if (size
- total_read
< stream
->avail_out
)
2064 stream
->avail_out
= size
- total_read
;
2065 status
= git_inflate(stream
, Z_FINISH
);
2066 git_SHA1_Update(&c
, buf
, stream
->next_out
- buf
);
2067 total_read
+= stream
->next_out
- buf
;
2069 git_inflate_end(stream
);
2071 if (status
!= Z_STREAM_END
) {
2072 error("corrupt loose object '%s'", sha1_to_hex(expected_sha1
));
2075 if (stream
->avail_in
) {
2076 error("garbage at end of loose object '%s'",
2077 sha1_to_hex(expected_sha1
));
2081 git_SHA1_Final(real_sha1
, &c
);
2082 if (hashcmp(expected_sha1
, real_sha1
)) {
2083 error("sha1 mismatch for %s (expected %s)", path
,
2084 sha1_to_hex(expected_sha1
));
2091 int read_loose_object(const char *path
,
2092 const unsigned char *expected_sha1
,
2093 enum object_type
*type
,
2094 unsigned long *size
,
2099 unsigned long mapsize
;
2105 map
= map_sha1_file_1(path
, NULL
, &mapsize
);
2107 error_errno("unable to mmap %s", path
);
2111 if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0) {
2112 error("unable to unpack header of %s", path
);
2116 *type
= parse_sha1_header(hdr
, size
);
2118 error("unable to parse header of %s", path
);
2119 git_inflate_end(&stream
);
2123 if (*type
== OBJ_BLOB
) {
2124 if (check_stream_sha1(&stream
, hdr
, *size
, path
, expected_sha1
) < 0)
2127 *contents
= unpack_sha1_rest(&stream
, hdr
, *size
, expected_sha1
);
2129 error("unable to unpack contents of %s", path
);
2130 git_inflate_end(&stream
);
2133 if (check_sha1_signature(expected_sha1
, *contents
,
2134 *size
, typename(*type
))) {
2135 error("sha1 mismatch for %s (expected %s)", path
,
2136 sha1_to_hex(expected_sha1
));
2142 ret
= 0; /* everything checks out */
2146 munmap(map
, mapsize
);