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"
33 const unsigned char null_sha1
[GIT_MAX_RAWSZ
];
34 const struct object_id null_oid
;
35 const struct object_id empty_tree_oid
= {
36 EMPTY_TREE_SHA1_BIN_LITERAL
38 const struct object_id empty_blob_oid
= {
39 EMPTY_BLOB_SHA1_BIN_LITERAL
43 * This is meant to hold a *small* number of objects that you would
44 * want read_sha1_file() to be able to return, but yet you do not want
45 * to write them into the object store (e.g. a browse-only
48 static struct cached_object
{
49 unsigned char sha1
[20];
50 enum object_type type
;
54 static int cached_object_nr
, cached_object_alloc
;
56 static struct cached_object empty_tree
= {
57 EMPTY_TREE_SHA1_BIN_LITERAL
,
63 static struct cached_object
*find_cached_object(const unsigned char *sha1
)
66 struct cached_object
*co
= cached_objects
;
68 for (i
= 0; i
< cached_object_nr
; i
++, co
++) {
69 if (!hashcmp(co
->sha1
, sha1
))
72 if (!hashcmp(sha1
, empty_tree
.sha1
))
77 int mkdir_in_gitdir(const char *path
)
79 if (mkdir(path
, 0777)) {
80 int saved_errno
= errno
;
82 struct strbuf sb
= STRBUF_INIT
;
87 * Are we looking at a path in a symlinked worktree
88 * whose original repository does not yet have it?
89 * e.g. .git/rr-cache pointing at its original
90 * repository in which the user hasn't performed any
91 * conflict resolution yet?
93 if (lstat(path
, &st
) || !S_ISLNK(st
.st_mode
) ||
94 strbuf_readlink(&sb
, path
, st
.st_size
) ||
95 !is_absolute_path(sb
.buf
) ||
96 mkdir(sb
.buf
, 0777)) {
103 return adjust_shared_perm(path
);
106 enum scld_error
safe_create_leading_directories(char *path
)
108 char *next_component
= path
+ offset_1st_component(path
);
109 enum scld_error ret
= SCLD_OK
;
111 while (ret
== SCLD_OK
&& next_component
) {
113 char *slash
= next_component
, slash_character
;
115 while (*slash
&& !is_dir_sep(*slash
))
121 next_component
= slash
+ 1;
122 while (is_dir_sep(*next_component
))
124 if (!*next_component
)
127 slash_character
= *slash
;
129 if (!stat(path
, &st
)) {
131 if (!S_ISDIR(st
.st_mode
)) {
135 } else if (mkdir(path
, 0777)) {
136 if (errno
== EEXIST
&&
137 !stat(path
, &st
) && S_ISDIR(st
.st_mode
))
138 ; /* somebody created it since we checked */
139 else if (errno
== ENOENT
)
141 * Either mkdir() failed because
142 * somebody just pruned the containing
143 * directory, or stat() failed because
144 * the file that was in our way was
145 * just removed. Either way, inform
146 * the caller that it might be worth
152 } else if (adjust_shared_perm(path
)) {
155 *slash
= slash_character
;
160 enum scld_error
safe_create_leading_directories_const(const char *path
)
163 /* path points to cache entries, so xstrdup before messing with it */
164 char *buf
= xstrdup(path
);
165 enum scld_error result
= safe_create_leading_directories(buf
);
173 int raceproof_create_file(const char *path
, create_file_fn fn
, void *cb
)
176 * The number of times we will try to remove empty directories
177 * in the way of path. This is only 1 because if another
178 * process is racily creating directories that conflict with
179 * us, we don't want to fight against them.
181 int remove_directories_remaining
= 1;
184 * The number of times that we will try to create the
185 * directories containing path. We are willing to attempt this
186 * more than once, because another process could be trying to
187 * clean up empty directories at the same time as we are
188 * trying to create them.
190 int create_directories_remaining
= 3;
192 /* A scratch copy of path, filled lazily if we need it: */
193 struct strbuf path_copy
= STRBUF_INIT
;
206 if (errno
== EISDIR
&& remove_directories_remaining
-- > 0) {
208 * A directory is in the way. Maybe it is empty; try
212 strbuf_addstr(&path_copy
, path
);
214 if (!remove_dir_recursively(&path_copy
, REMOVE_DIR_EMPTY_ONLY
))
216 } else if (errno
== ENOENT
&& create_directories_remaining
-- > 0) {
218 * Maybe the containing directory didn't exist, or
219 * maybe it was just deleted by a process that is
220 * racing with us to clean up empty directories. Try
223 enum scld_error scld_result
;
226 strbuf_addstr(&path_copy
, path
);
229 scld_result
= safe_create_leading_directories(path_copy
.buf
);
230 if (scld_result
== SCLD_OK
)
232 } while (scld_result
== SCLD_VANISHED
&& create_directories_remaining
-- > 0);
236 strbuf_release(&path_copy
);
241 static void fill_sha1_path(struct strbuf
*buf
, const unsigned char *sha1
)
244 for (i
= 0; i
< 20; i
++) {
245 static char hex
[] = "0123456789abcdef";
246 unsigned int val
= sha1
[i
];
247 strbuf_addch(buf
, hex
[val
>> 4]);
248 strbuf_addch(buf
, hex
[val
& 0xf]);
250 strbuf_addch(buf
, '/');
254 void sha1_file_name(struct strbuf
*buf
, const unsigned char *sha1
)
256 strbuf_addstr(buf
, get_object_directory());
257 strbuf_addch(buf
, '/');
258 fill_sha1_path(buf
, sha1
);
261 struct strbuf
*alt_scratch_buf(struct alternate_object_database
*alt
)
263 strbuf_setlen(&alt
->scratch
, alt
->base_len
);
264 return &alt
->scratch
;
267 static const char *alt_sha1_path(struct alternate_object_database
*alt
,
268 const unsigned char *sha1
)
270 struct strbuf
*buf
= alt_scratch_buf(alt
);
271 fill_sha1_path(buf
, sha1
);
275 struct alternate_object_database
*alt_odb_list
;
276 static struct alternate_object_database
**alt_odb_tail
;
279 * Return non-zero iff the path is usable as an alternate object database.
281 static int alt_odb_usable(struct strbuf
*path
, const char *normalized_objdir
)
283 struct alternate_object_database
*alt
;
285 /* Detect cases where alternate disappeared */
286 if (!is_directory(path
->buf
)) {
287 error("object directory %s does not exist; "
288 "check .git/objects/info/alternates.",
294 * Prevent the common mistake of listing the same
295 * thing twice, or object directory itself.
297 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
298 if (!fspathcmp(path
->buf
, alt
->path
))
301 if (!fspathcmp(path
->buf
, normalized_objdir
))
308 * Prepare alternate object database registry.
310 * The variable alt_odb_list points at the list of struct
311 * alternate_object_database. The elements on this list come from
312 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
313 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
314 * whose contents is similar to that environment variable but can be
315 * LF separated. Its base points at a statically allocated buffer that
316 * contains "/the/directory/corresponding/to/.git/objects/...", while
317 * its name points just after the slash at the end of ".git/objects/"
318 * in the example above, and has enough space to hold 40-byte hex
319 * SHA1, an extra slash for the first level indirection, and the
322 static void read_info_alternates(const char * relative_base
, int depth
);
323 static int link_alt_odb_entry(const char *entry
, const char *relative_base
,
324 int depth
, const char *normalized_objdir
)
326 struct alternate_object_database
*ent
;
327 struct strbuf pathbuf
= STRBUF_INIT
;
329 if (!is_absolute_path(entry
) && relative_base
) {
330 strbuf_realpath(&pathbuf
, relative_base
, 1);
331 strbuf_addch(&pathbuf
, '/');
333 strbuf_addstr(&pathbuf
, entry
);
335 if (strbuf_normalize_path(&pathbuf
) < 0 && relative_base
) {
336 error("unable to normalize alternate object path: %s",
338 strbuf_release(&pathbuf
);
343 * The trailing slash after the directory name is given by
344 * this function at the end. Remove duplicates.
346 while (pathbuf
.len
&& pathbuf
.buf
[pathbuf
.len
- 1] == '/')
347 strbuf_setlen(&pathbuf
, pathbuf
.len
- 1);
349 if (!alt_odb_usable(&pathbuf
, normalized_objdir
)) {
350 strbuf_release(&pathbuf
);
354 ent
= alloc_alt_odb(pathbuf
.buf
);
356 /* add the alternate entry */
358 alt_odb_tail
= &(ent
->next
);
361 /* recursively add alternates */
362 read_info_alternates(pathbuf
.buf
, depth
+ 1);
364 strbuf_release(&pathbuf
);
368 static const char *parse_alt_odb_entry(const char *string
,
376 if (*string
== '#') {
377 /* comment; consume up to next separator */
378 end
= strchrnul(string
, sep
);
379 } else if (*string
== '"' && !unquote_c_style(out
, string
, &end
)) {
381 * quoted path; unquote_c_style has copied the
382 * data for us and set "end". Broken quoting (e.g.,
383 * an entry that doesn't end with a quote) falls
384 * back to the unquoted case below.
387 /* normal, unquoted path */
388 end
= strchrnul(string
, sep
);
389 strbuf_add(out
, string
, end
- string
);
397 static void link_alt_odb_entries(const char *alt
, int sep
,
398 const char *relative_base
, int depth
)
400 struct strbuf objdirbuf
= STRBUF_INIT
;
401 struct strbuf entry
= STRBUF_INIT
;
407 error("%s: ignoring alternate object stores, nesting too deep.",
412 strbuf_add_absolute_path(&objdirbuf
, get_object_directory());
413 if (strbuf_normalize_path(&objdirbuf
) < 0)
414 die("unable to normalize object directory: %s",
418 alt
= parse_alt_odb_entry(alt
, sep
, &entry
);
421 link_alt_odb_entry(entry
.buf
, relative_base
, depth
, objdirbuf
.buf
);
423 strbuf_release(&entry
);
424 strbuf_release(&objdirbuf
);
427 static void read_info_alternates(const char * relative_base
, int depth
)
430 struct strbuf buf
= STRBUF_INIT
;
432 path
= xstrfmt("%s/info/alternates", relative_base
);
433 if (strbuf_read_file(&buf
, path
, 1024) < 0) {
434 warn_on_fopen_errors(path
);
439 link_alt_odb_entries(buf
.buf
, '\n', relative_base
, depth
);
440 strbuf_release(&buf
);
444 struct alternate_object_database
*alloc_alt_odb(const char *dir
)
446 struct alternate_object_database
*ent
;
448 FLEX_ALLOC_STR(ent
, path
, dir
);
449 strbuf_init(&ent
->scratch
, 0);
450 strbuf_addf(&ent
->scratch
, "%s/", dir
);
451 ent
->base_len
= ent
->scratch
.len
;
456 void add_to_alternates_file(const char *reference
)
458 struct lock_file
*lock
= xcalloc(1, sizeof(struct lock_file
));
459 char *alts
= git_pathdup("objects/info/alternates");
462 hold_lock_file_for_update(lock
, alts
, LOCK_DIE_ON_ERROR
);
463 out
= fdopen_lock_file(lock
, "w");
465 die_errno("unable to fdopen alternates lockfile");
467 in
= fopen(alts
, "r");
469 struct strbuf line
= STRBUF_INIT
;
472 while (strbuf_getline(&line
, in
) != EOF
) {
473 if (!strcmp(reference
, line
.buf
)) {
477 fprintf_or_die(out
, "%s\n", line
.buf
);
480 strbuf_release(&line
);
484 rollback_lock_file(lock
);
488 else if (errno
!= ENOENT
)
489 die_errno("unable to read alternates file");
492 fprintf_or_die(out
, "%s\n", reference
);
493 if (commit_lock_file(lock
))
494 die_errno("unable to move new alternates file into place");
496 link_alt_odb_entries(reference
, '\n', NULL
, 0);
501 void add_to_alternates_memory(const char *reference
)
504 * Make sure alternates are initialized, or else our entry may be
505 * overwritten when they are.
509 link_alt_odb_entries(reference
, '\n', NULL
, 0);
513 * Compute the exact path an alternate is at and returns it. In case of
514 * error NULL is returned and the human readable error is added to `err`
515 * `path` may be relative and should point to $GITDIR.
516 * `err` must not be null.
518 char *compute_alternate_path(const char *path
, struct strbuf
*err
)
520 char *ref_git
= NULL
;
521 const char *repo
, *ref_git_s
;
524 ref_git_s
= real_path_if_valid(path
);
527 strbuf_addf(err
, _("path '%s' does not exist"), path
);
531 * Beware: read_gitfile(), real_path() and mkpath()
532 * return static buffer
534 ref_git
= xstrdup(ref_git_s
);
536 repo
= read_gitfile(ref_git
);
538 repo
= read_gitfile(mkpath("%s/.git", ref_git
));
541 ref_git
= xstrdup(repo
);
544 if (!repo
&& is_directory(mkpath("%s/.git/objects", ref_git
))) {
545 char *ref_git_git
= mkpathdup("%s/.git", ref_git
);
547 ref_git
= ref_git_git
;
548 } else if (!is_directory(mkpath("%s/objects", ref_git
))) {
549 struct strbuf sb
= STRBUF_INIT
;
551 if (get_common_dir(&sb
, ref_git
)) {
553 _("reference repository '%s' as a linked "
554 "checkout is not supported yet."),
559 strbuf_addf(err
, _("reference repository '%s' is not a "
560 "local repository."), path
);
564 if (!access(mkpath("%s/shallow", ref_git
), F_OK
)) {
565 strbuf_addf(err
, _("reference repository '%s' is shallow"),
571 if (!access(mkpath("%s/info/grafts", ref_git
), F_OK
)) {
573 _("reference repository '%s' is grafted"),
581 FREE_AND_NULL(ref_git
);
587 int foreach_alt_odb(alt_odb_fn fn
, void *cb
)
589 struct alternate_object_database
*ent
;
593 for (ent
= alt_odb_list
; ent
; ent
= ent
->next
) {
601 void prepare_alt_odb(void)
608 alt
= getenv(ALTERNATE_DB_ENVIRONMENT
);
610 alt_odb_tail
= &alt_odb_list
;
611 link_alt_odb_entries(alt
, PATH_SEP
, NULL
, 0);
613 read_info_alternates(get_object_directory(), 0);
616 /* Returns 1 if we have successfully freshened the file, 0 otherwise. */
617 static int freshen_file(const char *fn
)
620 t
.actime
= t
.modtime
= time(NULL
);
621 return !utime(fn
, &t
);
625 * All of the check_and_freshen functions return 1 if the file exists and was
626 * freshened (if freshening was requested), 0 otherwise. If they return
627 * 0, you should not assume that it is safe to skip a write of the object (it
628 * either does not exist on disk, or has a stale mtime and may be subject to
631 int check_and_freshen_file(const char *fn
, int freshen
)
633 if (access(fn
, F_OK
))
635 if (freshen
&& !freshen_file(fn
))
640 static int check_and_freshen_local(const unsigned char *sha1
, int freshen
)
642 static struct strbuf buf
= STRBUF_INIT
;
645 sha1_file_name(&buf
, sha1
);
647 return check_and_freshen_file(buf
.buf
, freshen
);
650 static int check_and_freshen_nonlocal(const unsigned char *sha1
, int freshen
)
652 struct alternate_object_database
*alt
;
654 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
655 const char *path
= alt_sha1_path(alt
, sha1
);
656 if (check_and_freshen_file(path
, freshen
))
662 static int check_and_freshen(const unsigned char *sha1
, int freshen
)
664 return check_and_freshen_local(sha1
, freshen
) ||
665 check_and_freshen_nonlocal(sha1
, freshen
);
668 int has_loose_object_nonlocal(const unsigned char *sha1
)
670 return check_and_freshen_nonlocal(sha1
, 0);
673 static int has_loose_object(const unsigned char *sha1
)
675 return check_and_freshen(sha1
, 0);
678 static void mmap_limit_check(size_t length
)
680 static size_t limit
= 0;
682 limit
= git_env_ulong("GIT_MMAP_LIMIT", 0);
687 die("attempting to mmap %"PRIuMAX
" over limit %"PRIuMAX
,
688 (uintmax_t)length
, (uintmax_t)limit
);
691 void *xmmap_gently(void *start
, size_t length
,
692 int prot
, int flags
, int fd
, off_t offset
)
696 mmap_limit_check(length
);
697 ret
= mmap(start
, length
, prot
, flags
, fd
, offset
);
698 if (ret
== MAP_FAILED
) {
701 release_pack_memory(length
);
702 ret
= mmap(start
, length
, prot
, flags
, fd
, offset
);
707 void *xmmap(void *start
, size_t length
,
708 int prot
, int flags
, int fd
, off_t offset
)
710 void *ret
= xmmap_gently(start
, length
, prot
, flags
, fd
, offset
);
711 if (ret
== MAP_FAILED
)
712 die_errno("mmap failed");
717 * With an in-core object data in "map", rehash it to make sure the
718 * object name actually matches "sha1" to detect object corruption.
719 * With "map" == NULL, try reading the object named with "sha1" using
720 * the streaming interface and rehash it to do the same.
722 int check_sha1_signature(const unsigned char *sha1
, void *map
,
723 unsigned long size
, const char *type
)
725 unsigned char real_sha1
[20];
726 enum object_type obj_type
;
727 struct git_istream
*st
;
733 hash_sha1_file(map
, size
, type
, real_sha1
);
734 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
737 st
= open_istream(sha1
, &obj_type
, &size
, NULL
);
741 /* Generate the header */
742 hdrlen
= xsnprintf(hdr
, sizeof(hdr
), "%s %lu", typename(obj_type
), size
) + 1;
746 git_SHA1_Update(&c
, hdr
, hdrlen
);
749 ssize_t readlen
= read_istream(st
, buf
, sizeof(buf
));
757 git_SHA1_Update(&c
, buf
, readlen
);
759 git_SHA1_Final(real_sha1
, &c
);
761 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
764 int git_open_cloexec(const char *name
, int flags
)
767 static int o_cloexec
= O_CLOEXEC
;
769 fd
= open(name
, flags
| o_cloexec
);
770 if ((o_cloexec
& O_CLOEXEC
) && fd
< 0 && errno
== EINVAL
) {
771 /* Try again w/o O_CLOEXEC: the kernel might not support it */
772 o_cloexec
&= ~O_CLOEXEC
;
773 fd
= open(name
, flags
| o_cloexec
);
776 #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
778 static int fd_cloexec
= FD_CLOEXEC
;
780 if (!o_cloexec
&& 0 <= fd
&& fd_cloexec
) {
781 /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
782 int flags
= fcntl(fd
, F_GETFD
);
783 if (fcntl(fd
, F_SETFD
, flags
| fd_cloexec
))
792 * Find "sha1" as a loose object in the local repository or in an alternate.
793 * Returns 0 on success, negative on failure.
795 * The "path" out-parameter will give the path of the object we found (if any).
796 * Note that it may point to static storage and is only valid until another
797 * call to sha1_file_name(), etc.
799 static int stat_sha1_file(const unsigned char *sha1
, struct stat
*st
,
802 struct alternate_object_database
*alt
;
803 static struct strbuf buf
= STRBUF_INIT
;
806 sha1_file_name(&buf
, sha1
);
809 if (!lstat(*path
, st
))
814 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
815 *path
= alt_sha1_path(alt
, sha1
);
816 if (!lstat(*path
, st
))
824 * Like stat_sha1_file(), but actually open the object and return the
825 * descriptor. See the caveats on the "path" parameter above.
827 static int open_sha1_file(const unsigned char *sha1
, const char **path
)
830 struct alternate_object_database
*alt
;
831 int most_interesting_errno
;
832 static struct strbuf buf
= STRBUF_INIT
;
835 sha1_file_name(&buf
, sha1
);
838 fd
= git_open(*path
);
841 most_interesting_errno
= errno
;
844 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
845 *path
= alt_sha1_path(alt
, sha1
);
846 fd
= git_open(*path
);
849 if (most_interesting_errno
== ENOENT
)
850 most_interesting_errno
= errno
;
852 errno
= most_interesting_errno
;
857 * Map the loose object at "path" if it is not NULL, or the path found by
858 * searching for a loose object named "sha1".
860 static void *map_sha1_file_1(const char *path
,
861 const unsigned char *sha1
,
870 fd
= open_sha1_file(sha1
, &path
);
875 if (!fstat(fd
, &st
)) {
876 *size
= xsize_t(st
.st_size
);
878 /* mmap() is forbidden on empty files */
879 error("object file %s is empty", path
);
882 map
= xmmap(NULL
, *size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
889 void *map_sha1_file(const unsigned char *sha1
, unsigned long *size
)
891 return map_sha1_file_1(NULL
, sha1
, size
);
894 static int unpack_sha1_short_header(git_zstream
*stream
,
895 unsigned char *map
, unsigned long mapsize
,
896 void *buffer
, unsigned long bufsiz
)
898 /* Get the data stream */
899 memset(stream
, 0, sizeof(*stream
));
900 stream
->next_in
= map
;
901 stream
->avail_in
= mapsize
;
902 stream
->next_out
= buffer
;
903 stream
->avail_out
= bufsiz
;
905 git_inflate_init(stream
);
906 return git_inflate(stream
, 0);
909 int unpack_sha1_header(git_zstream
*stream
,
910 unsigned char *map
, unsigned long mapsize
,
911 void *buffer
, unsigned long bufsiz
)
913 int status
= unpack_sha1_short_header(stream
, map
, mapsize
,
919 /* Make sure we have the terminating NUL */
920 if (!memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
925 static int unpack_sha1_header_to_strbuf(git_zstream
*stream
, unsigned char *map
,
926 unsigned long mapsize
, void *buffer
,
927 unsigned long bufsiz
, struct strbuf
*header
)
931 status
= unpack_sha1_short_header(stream
, map
, mapsize
, buffer
, bufsiz
);
936 * Check if entire header is unpacked in the first iteration.
938 if (memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
942 * buffer[0..bufsiz] was not large enough. Copy the partial
943 * result out to header, and then append the result of further
944 * reading the stream.
946 strbuf_add(header
, buffer
, stream
->next_out
- (unsigned char *)buffer
);
947 stream
->next_out
= buffer
;
948 stream
->avail_out
= bufsiz
;
951 status
= git_inflate(stream
, 0);
952 strbuf_add(header
, buffer
, stream
->next_out
- (unsigned char *)buffer
);
953 if (memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
955 stream
->next_out
= buffer
;
956 stream
->avail_out
= bufsiz
;
957 } while (status
!= Z_STREAM_END
);
961 static void *unpack_sha1_rest(git_zstream
*stream
, void *buffer
, unsigned long size
, const unsigned char *sha1
)
963 int bytes
= strlen(buffer
) + 1;
964 unsigned char *buf
= xmallocz(size
);
968 n
= stream
->total_out
- bytes
;
971 memcpy(buf
, (char *) buffer
+ bytes
, n
);
975 * The above condition must be (bytes <= size), not
976 * (bytes < size). In other words, even though we
977 * expect no more output and set avail_out to zero,
978 * the input zlib stream may have bytes that express
979 * "this concludes the stream", and we *do* want to
982 * Otherwise we would not be able to test that we
983 * consumed all the input to reach the expected size;
984 * we also want to check that zlib tells us that all
985 * went well with status == Z_STREAM_END at the end.
987 stream
->next_out
= buf
+ bytes
;
988 stream
->avail_out
= size
- bytes
;
989 while (status
== Z_OK
)
990 status
= git_inflate(stream
, Z_FINISH
);
992 if (status
== Z_STREAM_END
&& !stream
->avail_in
) {
993 git_inflate_end(stream
);
998 error("corrupt loose object '%s'", sha1_to_hex(sha1
));
999 else if (stream
->avail_in
)
1000 error("garbage at end of loose object '%s'",
1007 * We used to just use "sscanf()", but that's actually way
1008 * too permissive for what we want to check. So do an anal
1009 * object header parse by hand.
1011 static int parse_sha1_header_extended(const char *hdr
, struct object_info
*oi
,
1014 const char *type_buf
= hdr
;
1016 int type
, type_len
= 0;
1019 * The type can be of any size but is followed by
1031 type
= type_from_string_gently(type_buf
, type_len
, 1);
1033 strbuf_add(oi
->typename
, type_buf
, type_len
);
1035 * Set type to 0 if its an unknown object and
1036 * we're obtaining the type using '--allow-unknown-type'
1039 if ((flags
& OBJECT_INFO_ALLOW_UNKNOWN_TYPE
) && (type
< 0))
1042 die("invalid object type");
1047 * The length must follow immediately, and be in canonical
1048 * decimal format (ie "010" is not valid).
1050 size
= *hdr
++ - '0';
1055 unsigned long c
= *hdr
- '0';
1059 size
= size
* 10 + c
;
1067 * The length must be followed by a zero byte
1069 return *hdr
? -1 : type
;
1072 int parse_sha1_header(const char *hdr
, unsigned long *sizep
)
1074 struct object_info oi
= OBJECT_INFO_INIT
;
1077 return parse_sha1_header_extended(hdr
, &oi
, 0);
1080 static int sha1_loose_object_info(const unsigned char *sha1
,
1081 struct object_info
*oi
,
1085 unsigned long mapsize
;
1089 struct strbuf hdrbuf
= STRBUF_INIT
;
1090 unsigned long size_scratch
;
1092 if (oi
->delta_base_sha1
)
1093 hashclr(oi
->delta_base_sha1
);
1096 * If we don't care about type or size, then we don't
1097 * need to look inside the object at all. Note that we
1098 * do not optimize out the stat call, even if the
1099 * caller doesn't care about the disk-size, since our
1100 * return value implicitly indicates whether the
1101 * object even exists.
1103 if (!oi
->typep
&& !oi
->typename
&& !oi
->sizep
&& !oi
->contentp
) {
1106 if (stat_sha1_file(sha1
, &st
, &path
) < 0)
1109 *oi
->disk_sizep
= st
.st_size
;
1113 map
= map_sha1_file(sha1
, &mapsize
);
1118 oi
->sizep
= &size_scratch
;
1121 *oi
->disk_sizep
= mapsize
;
1122 if ((flags
& OBJECT_INFO_ALLOW_UNKNOWN_TYPE
)) {
1123 if (unpack_sha1_header_to_strbuf(&stream
, map
, mapsize
, hdr
, sizeof(hdr
), &hdrbuf
) < 0)
1124 status
= error("unable to unpack %s header with --allow-unknown-type",
1126 } else if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0)
1127 status
= error("unable to unpack %s header",
1131 else if (hdrbuf
.len
) {
1132 if ((status
= parse_sha1_header_extended(hdrbuf
.buf
, oi
, flags
)) < 0)
1133 status
= error("unable to parse %s header with --allow-unknown-type",
1135 } else if ((status
= parse_sha1_header_extended(hdr
, oi
, flags
)) < 0)
1136 status
= error("unable to parse %s header", sha1_to_hex(sha1
));
1138 if (status
>= 0 && oi
->contentp
) {
1139 *oi
->contentp
= unpack_sha1_rest(&stream
, hdr
,
1141 if (!*oi
->contentp
) {
1142 git_inflate_end(&stream
);
1146 git_inflate_end(&stream
);
1148 munmap(map
, mapsize
);
1149 if (status
&& oi
->typep
)
1150 *oi
->typep
= status
;
1151 if (oi
->sizep
== &size_scratch
)
1153 strbuf_release(&hdrbuf
);
1154 oi
->whence
= OI_LOOSE
;
1155 return (status
< 0) ? status
: 0;
1158 int sha1_object_info_extended(const unsigned char *sha1
, struct object_info
*oi
, unsigned flags
)
1160 static struct object_info blank_oi
= OBJECT_INFO_INIT
;
1161 struct pack_entry e
;
1163 const unsigned char *real
= (flags
& OBJECT_INFO_LOOKUP_REPLACE
) ?
1164 lookup_replace_object(sha1
) :
1170 if (!(flags
& OBJECT_INFO_SKIP_CACHED
)) {
1171 struct cached_object
*co
= find_cached_object(real
);
1174 *(oi
->typep
) = co
->type
;
1176 *(oi
->sizep
) = co
->size
;
1178 *(oi
->disk_sizep
) = 0;
1179 if (oi
->delta_base_sha1
)
1180 hashclr(oi
->delta_base_sha1
);
1182 strbuf_addstr(oi
->typename
, typename(co
->type
));
1184 *oi
->contentp
= xmemdupz(co
->buf
, co
->size
);
1185 oi
->whence
= OI_CACHED
;
1190 if (!find_pack_entry(real
, &e
)) {
1191 /* Most likely it's a loose object. */
1192 if (!sha1_loose_object_info(real
, oi
, flags
))
1195 /* Not a loose object; someone else may have just packed it. */
1196 if (flags
& OBJECT_INFO_QUICK
) {
1199 reprepare_packed_git();
1200 if (!find_pack_entry(real
, &e
))
1205 if (oi
== &blank_oi
)
1207 * We know that the caller doesn't actually need the
1208 * information below, so return early.
1212 rtype
= packed_object_info(e
.p
, e
.offset
, oi
);
1214 mark_bad_packed_object(e
.p
, real
);
1215 return sha1_object_info_extended(real
, oi
, 0);
1216 } else if (oi
->whence
== OI_PACKED
) {
1217 oi
->u
.packed
.offset
= e
.offset
;
1218 oi
->u
.packed
.pack
= e
.p
;
1219 oi
->u
.packed
.is_delta
= (rtype
== OBJ_REF_DELTA
||
1220 rtype
== OBJ_OFS_DELTA
);
1226 /* returns enum object_type or negative */
1227 int sha1_object_info(const unsigned char *sha1
, unsigned long *sizep
)
1229 enum object_type type
;
1230 struct object_info oi
= OBJECT_INFO_INIT
;
1234 if (sha1_object_info_extended(sha1
, &oi
,
1235 OBJECT_INFO_LOOKUP_REPLACE
) < 0)
1240 static void *read_object(const unsigned char *sha1
, enum object_type
*type
,
1241 unsigned long *size
)
1243 struct object_info oi
= OBJECT_INFO_INIT
;
1247 oi
.contentp
= &content
;
1249 if (sha1_object_info_extended(sha1
, &oi
, 0) < 0)
1254 int pretend_sha1_file(void *buf
, unsigned long len
, enum object_type type
,
1255 unsigned char *sha1
)
1257 struct cached_object
*co
;
1259 hash_sha1_file(buf
, len
, typename(type
), sha1
);
1260 if (has_sha1_file(sha1
) || find_cached_object(sha1
))
1262 ALLOC_GROW(cached_objects
, cached_object_nr
+ 1, cached_object_alloc
);
1263 co
= &cached_objects
[cached_object_nr
++];
1266 co
->buf
= xmalloc(len
);
1267 memcpy(co
->buf
, buf
, len
);
1268 hashcpy(co
->sha1
, sha1
);
1273 * This function dies on corrupt objects; the callers who want to
1274 * deal with them should arrange to call read_object() and give error
1275 * messages themselves.
1277 void *read_sha1_file_extended(const unsigned char *sha1
,
1278 enum object_type
*type
,
1279 unsigned long *size
,
1283 const struct packed_git
*p
;
1286 const unsigned char *repl
= lookup_replace
? lookup_replace_object(sha1
)
1290 data
= read_object(repl
, type
, size
);
1294 if (errno
&& errno
!= ENOENT
)
1295 die_errno("failed to read object %s", sha1_to_hex(sha1
));
1297 /* die if we replaced an object with one that does not exist */
1299 die("replacement %s not found for %s",
1300 sha1_to_hex(repl
), sha1_to_hex(sha1
));
1302 if (!stat_sha1_file(repl
, &st
, &path
))
1303 die("loose object %s (stored in %s) is corrupt",
1304 sha1_to_hex(repl
), path
);
1306 if ((p
= has_packed_and_bad(repl
)) != NULL
)
1307 die("packed object %s (stored in %s) is corrupt",
1308 sha1_to_hex(repl
), p
->pack_name
);
1313 void *read_object_with_reference(const unsigned char *sha1
,
1314 const char *required_type_name
,
1315 unsigned long *size
,
1316 unsigned char *actual_sha1_return
)
1318 enum object_type type
, required_type
;
1320 unsigned long isize
;
1321 unsigned char actual_sha1
[20];
1323 required_type
= type_from_string(required_type_name
);
1324 hashcpy(actual_sha1
, sha1
);
1326 int ref_length
= -1;
1327 const char *ref_type
= NULL
;
1329 buffer
= read_sha1_file(actual_sha1
, &type
, &isize
);
1332 if (type
== required_type
) {
1334 if (actual_sha1_return
)
1335 hashcpy(actual_sha1_return
, actual_sha1
);
1338 /* Handle references */
1339 else if (type
== OBJ_COMMIT
)
1341 else if (type
== OBJ_TAG
)
1342 ref_type
= "object ";
1347 ref_length
= strlen(ref_type
);
1349 if (ref_length
+ 40 > isize
||
1350 memcmp(buffer
, ref_type
, ref_length
) ||
1351 get_sha1_hex((char *) buffer
+ ref_length
, actual_sha1
)) {
1356 /* Now we have the ID of the referred-to object in
1357 * actual_sha1. Check again. */
1361 static void write_sha1_file_prepare(const void *buf
, unsigned long len
,
1362 const char *type
, unsigned char *sha1
,
1363 char *hdr
, int *hdrlen
)
1367 /* Generate the header */
1368 *hdrlen
= xsnprintf(hdr
, *hdrlen
, "%s %lu", type
, len
)+1;
1372 git_SHA1_Update(&c
, hdr
, *hdrlen
);
1373 git_SHA1_Update(&c
, buf
, len
);
1374 git_SHA1_Final(sha1
, &c
);
1378 * Move the just written object into its final resting place.
1380 int finalize_object_file(const char *tmpfile
, const char *filename
)
1384 if (object_creation_mode
== OBJECT_CREATION_USES_RENAMES
)
1386 else if (link(tmpfile
, filename
))
1390 * Coda hack - coda doesn't like cross-directory links,
1391 * so we fall back to a rename, which will mean that it
1392 * won't be able to check collisions, but that's not a
1395 * The same holds for FAT formatted media.
1397 * When this succeeds, we just return. We have nothing
1400 if (ret
&& ret
!= EEXIST
) {
1402 if (!rename(tmpfile
, filename
))
1406 unlink_or_warn(tmpfile
);
1408 if (ret
!= EEXIST
) {
1409 return error_errno("unable to write sha1 filename %s", filename
);
1411 /* FIXME!!! Collision check here ? */
1415 if (adjust_shared_perm(filename
))
1416 return error("unable to set permission to '%s'", filename
);
1420 static int write_buffer(int fd
, const void *buf
, size_t len
)
1422 if (write_in_full(fd
, buf
, len
) < 0)
1423 return error_errno("file write error");
1427 int hash_sha1_file(const void *buf
, unsigned long len
, const char *type
,
1428 unsigned char *sha1
)
1431 int hdrlen
= sizeof(hdr
);
1432 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1436 /* Finalize a file on disk, and close it. */
1437 static void close_sha1_file(int fd
)
1439 if (fsync_object_files
)
1440 fsync_or_die(fd
, "sha1 file");
1442 die_errno("error when closing sha1 file");
1445 /* Size of directory component, including the ending '/' */
1446 static inline int directory_size(const char *filename
)
1448 const char *s
= strrchr(filename
, '/');
1451 return s
- filename
+ 1;
1455 * This creates a temporary file in the same directory as the final
1458 * We want to avoid cross-directory filename renames, because those
1459 * can have problems on various filesystems (FAT, NFS, Coda).
1461 static int create_tmpfile(struct strbuf
*tmp
, const char *filename
)
1463 int fd
, dirlen
= directory_size(filename
);
1466 strbuf_add(tmp
, filename
, dirlen
);
1467 strbuf_addstr(tmp
, "tmp_obj_XXXXXX");
1468 fd
= git_mkstemp_mode(tmp
->buf
, 0444);
1469 if (fd
< 0 && dirlen
&& errno
== ENOENT
) {
1471 * Make sure the directory exists; note that the contents
1472 * of the buffer are undefined after mkstemp returns an
1473 * error, so we have to rewrite the whole buffer from
1477 strbuf_add(tmp
, filename
, dirlen
- 1);
1478 if (mkdir(tmp
->buf
, 0777) && errno
!= EEXIST
)
1480 if (adjust_shared_perm(tmp
->buf
))
1484 strbuf_addstr(tmp
, "/tmp_obj_XXXXXX");
1485 fd
= git_mkstemp_mode(tmp
->buf
, 0444);
1490 static int write_loose_object(const unsigned char *sha1
, char *hdr
, int hdrlen
,
1491 const void *buf
, unsigned long len
, time_t mtime
)
1494 unsigned char compressed
[4096];
1497 unsigned char parano_sha1
[20];
1498 static struct strbuf tmp_file
= STRBUF_INIT
;
1499 static struct strbuf filename
= STRBUF_INIT
;
1501 strbuf_reset(&filename
);
1502 sha1_file_name(&filename
, sha1
);
1504 fd
= create_tmpfile(&tmp_file
, filename
.buf
);
1506 if (errno
== EACCES
)
1507 return error("insufficient permission for adding an object to repository database %s", get_object_directory());
1509 return error_errno("unable to create temporary file");
1513 git_deflate_init(&stream
, zlib_compression_level
);
1514 stream
.next_out
= compressed
;
1515 stream
.avail_out
= sizeof(compressed
);
1518 /* First header.. */
1519 stream
.next_in
= (unsigned char *)hdr
;
1520 stream
.avail_in
= hdrlen
;
1521 while (git_deflate(&stream
, 0) == Z_OK
)
1523 git_SHA1_Update(&c
, hdr
, hdrlen
);
1525 /* Then the data itself.. */
1526 stream
.next_in
= (void *)buf
;
1527 stream
.avail_in
= len
;
1529 unsigned char *in0
= stream
.next_in
;
1530 ret
= git_deflate(&stream
, Z_FINISH
);
1531 git_SHA1_Update(&c
, in0
, stream
.next_in
- in0
);
1532 if (write_buffer(fd
, compressed
, stream
.next_out
- compressed
) < 0)
1533 die("unable to write sha1 file");
1534 stream
.next_out
= compressed
;
1535 stream
.avail_out
= sizeof(compressed
);
1536 } while (ret
== Z_OK
);
1538 if (ret
!= Z_STREAM_END
)
1539 die("unable to deflate new object %s (%d)", sha1_to_hex(sha1
), ret
);
1540 ret
= git_deflate_end_gently(&stream
);
1542 die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1
), ret
);
1543 git_SHA1_Final(parano_sha1
, &c
);
1544 if (hashcmp(sha1
, parano_sha1
) != 0)
1545 die("confused by unstable object source data for %s", sha1_to_hex(sha1
));
1547 close_sha1_file(fd
);
1552 utb
.modtime
= mtime
;
1553 if (utime(tmp_file
.buf
, &utb
) < 0)
1554 warning_errno("failed utime() on %s", tmp_file
.buf
);
1557 return finalize_object_file(tmp_file
.buf
, filename
.buf
);
1560 static int freshen_loose_object(const unsigned char *sha1
)
1562 return check_and_freshen(sha1
, 1);
1565 static int freshen_packed_object(const unsigned char *sha1
)
1567 struct pack_entry e
;
1568 if (!find_pack_entry(sha1
, &e
))
1572 if (!freshen_file(e
.p
->pack_name
))
1578 int write_sha1_file(const void *buf
, unsigned long len
, const char *type
, unsigned char *sha1
)
1581 int hdrlen
= sizeof(hdr
);
1583 /* Normally if we have it in the pack then we do not bother writing
1584 * it out into .git/objects/??/?{38} file.
1586 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1587 if (freshen_packed_object(sha1
) || freshen_loose_object(sha1
))
1589 return write_loose_object(sha1
, hdr
, hdrlen
, buf
, len
, 0);
1592 int hash_sha1_file_literally(const void *buf
, unsigned long len
, const char *type
,
1593 struct object_id
*oid
, unsigned flags
)
1596 int hdrlen
, status
= 0;
1598 /* type string, SP, %lu of the length plus NUL must fit this */
1599 hdrlen
= strlen(type
) + 32;
1600 header
= xmalloc(hdrlen
);
1601 write_sha1_file_prepare(buf
, len
, type
, oid
->hash
, header
, &hdrlen
);
1603 if (!(flags
& HASH_WRITE_OBJECT
))
1605 if (freshen_packed_object(oid
->hash
) || freshen_loose_object(oid
->hash
))
1607 status
= write_loose_object(oid
->hash
, header
, hdrlen
, buf
, len
, 0);
1614 int force_object_loose(const unsigned char *sha1
, time_t mtime
)
1618 enum object_type type
;
1623 if (has_loose_object(sha1
))
1625 buf
= read_object(sha1
, &type
, &len
);
1627 return error("cannot read sha1_file for %s", sha1_to_hex(sha1
));
1628 hdrlen
= xsnprintf(hdr
, sizeof(hdr
), "%s %lu", typename(type
), len
) + 1;
1629 ret
= write_loose_object(sha1
, hdr
, hdrlen
, buf
, len
, mtime
);
1635 int has_sha1_file_with_flags(const unsigned char *sha1
, int flags
)
1637 if (!startup_info
->have_repository
)
1639 return sha1_object_info_extended(sha1
, NULL
,
1640 flags
| OBJECT_INFO_SKIP_CACHED
) >= 0;
1643 int has_object_file(const struct object_id
*oid
)
1645 return has_sha1_file(oid
->hash
);
1648 int has_object_file_with_flags(const struct object_id
*oid
, int flags
)
1650 return has_sha1_file_with_flags(oid
->hash
, flags
);
1653 static void check_tree(const void *buf
, size_t size
)
1655 struct tree_desc desc
;
1656 struct name_entry entry
;
1658 init_tree_desc(&desc
, buf
, size
);
1659 while (tree_entry(&desc
, &entry
))
1661 * tree_entry() will die() on malformed entries */
1665 static void check_commit(const void *buf
, size_t size
)
1668 memset(&c
, 0, sizeof(c
));
1669 if (parse_commit_buffer(&c
, buf
, size
))
1670 die("corrupt commit");
1673 static void check_tag(const void *buf
, size_t size
)
1676 memset(&t
, 0, sizeof(t
));
1677 if (parse_tag_buffer(&t
, buf
, size
))
1681 static int index_mem(unsigned char *sha1
, void *buf
, size_t size
,
1682 enum object_type type
,
1683 const char *path
, unsigned flags
)
1685 int ret
, re_allocated
= 0;
1686 int write_object
= flags
& HASH_WRITE_OBJECT
;
1692 * Convert blobs to git internal format
1694 if ((type
== OBJ_BLOB
) && path
) {
1695 struct strbuf nbuf
= STRBUF_INIT
;
1696 if (convert_to_git(&the_index
, path
, buf
, size
, &nbuf
,
1697 write_object
? safe_crlf
: SAFE_CRLF_FALSE
)) {
1698 buf
= strbuf_detach(&nbuf
, &size
);
1702 if (flags
& HASH_FORMAT_CHECK
) {
1703 if (type
== OBJ_TREE
)
1704 check_tree(buf
, size
);
1705 if (type
== OBJ_COMMIT
)
1706 check_commit(buf
, size
);
1707 if (type
== OBJ_TAG
)
1708 check_tag(buf
, size
);
1712 ret
= write_sha1_file(buf
, size
, typename(type
), sha1
);
1714 ret
= hash_sha1_file(buf
, size
, typename(type
), sha1
);
1720 static int index_stream_convert_blob(unsigned char *sha1
, int fd
,
1721 const char *path
, unsigned flags
)
1724 const int write_object
= flags
& HASH_WRITE_OBJECT
;
1725 struct strbuf sbuf
= STRBUF_INIT
;
1728 assert(would_convert_to_git_filter_fd(path
));
1730 convert_to_git_filter_fd(&the_index
, path
, fd
, &sbuf
,
1731 write_object
? safe_crlf
: SAFE_CRLF_FALSE
);
1734 ret
= write_sha1_file(sbuf
.buf
, sbuf
.len
, typename(OBJ_BLOB
),
1737 ret
= hash_sha1_file(sbuf
.buf
, sbuf
.len
, typename(OBJ_BLOB
),
1739 strbuf_release(&sbuf
);
1743 static int index_pipe(unsigned char *sha1
, int fd
, enum object_type type
,
1744 const char *path
, unsigned flags
)
1746 struct strbuf sbuf
= STRBUF_INIT
;
1749 if (strbuf_read(&sbuf
, fd
, 4096) >= 0)
1750 ret
= index_mem(sha1
, sbuf
.buf
, sbuf
.len
, type
, path
, flags
);
1753 strbuf_release(&sbuf
);
1757 #define SMALL_FILE_SIZE (32*1024)
1759 static int index_core(unsigned char *sha1
, int fd
, size_t size
,
1760 enum object_type type
, const char *path
,
1766 ret
= index_mem(sha1
, "", size
, type
, path
, flags
);
1767 } else if (size
<= SMALL_FILE_SIZE
) {
1768 char *buf
= xmalloc(size
);
1769 ssize_t read_result
= read_in_full(fd
, buf
, size
);
1770 if (read_result
< 0)
1771 ret
= error_errno("read error while indexing %s",
1772 path
? path
: "<unknown>");
1773 else if (read_result
!= size
)
1774 ret
= error("short read while indexing %s",
1775 path
? path
: "<unknown>");
1777 ret
= index_mem(sha1
, buf
, size
, type
, path
, flags
);
1780 void *buf
= xmmap(NULL
, size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
1781 ret
= index_mem(sha1
, buf
, size
, type
, path
, flags
);
1788 * This creates one packfile per large blob unless bulk-checkin
1789 * machinery is "plugged".
1791 * This also bypasses the usual "convert-to-git" dance, and that is on
1792 * purpose. We could write a streaming version of the converting
1793 * functions and insert that before feeding the data to fast-import
1794 * (or equivalent in-core API described above). However, that is
1795 * somewhat complicated, as we do not know the size of the filter
1796 * result, which we need to know beforehand when writing a git object.
1797 * Since the primary motivation for trying to stream from the working
1798 * tree file and to avoid mmaping it in core is to deal with large
1799 * binary blobs, they generally do not want to get any conversion, and
1800 * callers should avoid this code path when filters are requested.
1802 static int index_stream(struct object_id
*oid
, int fd
, size_t size
,
1803 enum object_type type
, const char *path
,
1806 return index_bulk_checkin(oid
->hash
, fd
, size
, type
, path
, flags
);
1809 int index_fd(struct object_id
*oid
, int fd
, struct stat
*st
,
1810 enum object_type type
, const char *path
, unsigned flags
)
1815 * Call xsize_t() only when needed to avoid potentially unnecessary
1816 * die() for large files.
1818 if (type
== OBJ_BLOB
&& path
&& would_convert_to_git_filter_fd(path
))
1819 ret
= index_stream_convert_blob(oid
->hash
, fd
, path
, flags
);
1820 else if (!S_ISREG(st
->st_mode
))
1821 ret
= index_pipe(oid
->hash
, fd
, type
, path
, flags
);
1822 else if (st
->st_size
<= big_file_threshold
|| type
!= OBJ_BLOB
||
1823 (path
&& would_convert_to_git(&the_index
, path
)))
1824 ret
= index_core(oid
->hash
, fd
, xsize_t(st
->st_size
), type
, path
,
1827 ret
= index_stream(oid
, fd
, xsize_t(st
->st_size
), type
, path
,
1833 int index_path(struct object_id
*oid
, const char *path
, struct stat
*st
, unsigned flags
)
1836 struct strbuf sb
= STRBUF_INIT
;
1839 switch (st
->st_mode
& S_IFMT
) {
1841 fd
= open(path
, O_RDONLY
);
1843 return error_errno("open(\"%s\")", path
);
1844 if (index_fd(oid
, fd
, st
, OBJ_BLOB
, path
, flags
) < 0)
1845 return error("%s: failed to insert into database",
1849 if (strbuf_readlink(&sb
, path
, st
->st_size
))
1850 return error_errno("readlink(\"%s\")", path
);
1851 if (!(flags
& HASH_WRITE_OBJECT
))
1852 hash_sha1_file(sb
.buf
, sb
.len
, blob_type
, oid
->hash
);
1853 else if (write_sha1_file(sb
.buf
, sb
.len
, blob_type
, oid
->hash
))
1854 rc
= error("%s: failed to insert into database", path
);
1855 strbuf_release(&sb
);
1858 return resolve_gitlink_ref(path
, "HEAD", oid
->hash
);
1860 return error("%s: unsupported file type", path
);
1865 int read_pack_header(int fd
, struct pack_header
*header
)
1867 if (read_in_full(fd
, header
, sizeof(*header
)) != sizeof(*header
))
1868 /* "eof before pack header was fully read" */
1869 return PH_ERROR_EOF
;
1871 if (header
->hdr_signature
!= htonl(PACK_SIGNATURE
))
1872 /* "protocol error (pack signature mismatch detected)" */
1873 return PH_ERROR_PACK_SIGNATURE
;
1874 if (!pack_version_ok(header
->hdr_version
))
1875 /* "protocol error (pack version unsupported)" */
1876 return PH_ERROR_PROTOCOL
;
1880 void assert_sha1_type(const unsigned char *sha1
, enum object_type expect
)
1882 enum object_type type
= sha1_object_info(sha1
, NULL
);
1884 die("%s is not a valid object", sha1_to_hex(sha1
));
1886 die("%s is not a valid '%s' object", sha1_to_hex(sha1
),
1890 int for_each_file_in_obj_subdir(unsigned int subdir_nr
,
1891 struct strbuf
*path
,
1892 each_loose_object_fn obj_cb
,
1893 each_loose_cruft_fn cruft_cb
,
1894 each_loose_subdir_fn subdir_cb
,
1897 size_t origlen
, baselen
;
1902 if (subdir_nr
> 0xff)
1903 BUG("invalid loose object subdirectory: %x", subdir_nr
);
1905 origlen
= path
->len
;
1906 strbuf_complete(path
, '/');
1907 strbuf_addf(path
, "%02x", subdir_nr
);
1908 baselen
= path
->len
;
1910 dir
= opendir(path
->buf
);
1912 if (errno
!= ENOENT
)
1913 r
= error_errno("unable to open %s", path
->buf
);
1914 strbuf_setlen(path
, origlen
);
1918 while ((de
= readdir(dir
))) {
1919 if (is_dot_or_dotdot(de
->d_name
))
1922 strbuf_setlen(path
, baselen
);
1923 strbuf_addf(path
, "/%s", de
->d_name
);
1925 if (strlen(de
->d_name
) == GIT_SHA1_HEXSZ
- 2) {
1926 char hex
[GIT_MAX_HEXSZ
+1];
1927 struct object_id oid
;
1929 xsnprintf(hex
, sizeof(hex
), "%02x%s",
1930 subdir_nr
, de
->d_name
);
1931 if (!get_oid_hex(hex
, &oid
)) {
1933 r
= obj_cb(&oid
, path
->buf
, data
);
1942 r
= cruft_cb(de
->d_name
, path
->buf
, data
);
1949 strbuf_setlen(path
, baselen
);
1950 if (!r
&& subdir_cb
)
1951 r
= subdir_cb(subdir_nr
, path
->buf
, data
);
1953 strbuf_setlen(path
, origlen
);
1958 int for_each_loose_file_in_objdir_buf(struct strbuf
*path
,
1959 each_loose_object_fn obj_cb
,
1960 each_loose_cruft_fn cruft_cb
,
1961 each_loose_subdir_fn subdir_cb
,
1967 for (i
= 0; i
< 256; i
++) {
1968 r
= for_each_file_in_obj_subdir(i
, path
, obj_cb
, cruft_cb
,
1977 int for_each_loose_file_in_objdir(const char *path
,
1978 each_loose_object_fn obj_cb
,
1979 each_loose_cruft_fn cruft_cb
,
1980 each_loose_subdir_fn subdir_cb
,
1983 struct strbuf buf
= STRBUF_INIT
;
1986 strbuf_addstr(&buf
, path
);
1987 r
= for_each_loose_file_in_objdir_buf(&buf
, obj_cb
, cruft_cb
,
1989 strbuf_release(&buf
);
1994 struct loose_alt_odb_data
{
1995 each_loose_object_fn
*cb
;
1999 static int loose_from_alt_odb(struct alternate_object_database
*alt
,
2002 struct loose_alt_odb_data
*data
= vdata
;
2003 struct strbuf buf
= STRBUF_INIT
;
2006 strbuf_addstr(&buf
, alt
->path
);
2007 r
= for_each_loose_file_in_objdir_buf(&buf
,
2008 data
->cb
, NULL
, NULL
,
2010 strbuf_release(&buf
);
2014 int for_each_loose_object(each_loose_object_fn cb
, void *data
, unsigned flags
)
2016 struct loose_alt_odb_data alt
;
2019 r
= for_each_loose_file_in_objdir(get_object_directory(),
2020 cb
, NULL
, NULL
, data
);
2024 if (flags
& FOR_EACH_OBJECT_LOCAL_ONLY
)
2029 return foreach_alt_odb(loose_from_alt_odb
, &alt
);
2032 static int check_stream_sha1(git_zstream
*stream
,
2036 const unsigned char *expected_sha1
)
2039 unsigned char real_sha1
[GIT_MAX_RAWSZ
];
2040 unsigned char buf
[4096];
2041 unsigned long total_read
;
2045 git_SHA1_Update(&c
, hdr
, stream
->total_out
);
2048 * We already read some bytes into hdr, but the ones up to the NUL
2049 * do not count against the object's content size.
2051 total_read
= stream
->total_out
- strlen(hdr
) - 1;
2054 * This size comparison must be "<=" to read the final zlib packets;
2055 * see the comment in unpack_sha1_rest for details.
2057 while (total_read
<= size
&&
2058 (status
== Z_OK
|| status
== Z_BUF_ERROR
)) {
2059 stream
->next_out
= buf
;
2060 stream
->avail_out
= sizeof(buf
);
2061 if (size
- total_read
< stream
->avail_out
)
2062 stream
->avail_out
= size
- total_read
;
2063 status
= git_inflate(stream
, Z_FINISH
);
2064 git_SHA1_Update(&c
, buf
, stream
->next_out
- buf
);
2065 total_read
+= stream
->next_out
- buf
;
2067 git_inflate_end(stream
);
2069 if (status
!= Z_STREAM_END
) {
2070 error("corrupt loose object '%s'", sha1_to_hex(expected_sha1
));
2073 if (stream
->avail_in
) {
2074 error("garbage at end of loose object '%s'",
2075 sha1_to_hex(expected_sha1
));
2079 git_SHA1_Final(real_sha1
, &c
);
2080 if (hashcmp(expected_sha1
, real_sha1
)) {
2081 error("sha1 mismatch for %s (expected %s)", path
,
2082 sha1_to_hex(expected_sha1
));
2089 int read_loose_object(const char *path
,
2090 const unsigned char *expected_sha1
,
2091 enum object_type
*type
,
2092 unsigned long *size
,
2097 unsigned long mapsize
;
2103 map
= map_sha1_file_1(path
, NULL
, &mapsize
);
2105 error_errno("unable to mmap %s", path
);
2109 if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0) {
2110 error("unable to unpack header of %s", path
);
2114 *type
= parse_sha1_header(hdr
, size
);
2116 error("unable to parse header of %s", path
);
2117 git_inflate_end(&stream
);
2121 if (*type
== OBJ_BLOB
) {
2122 if (check_stream_sha1(&stream
, hdr
, *size
, path
, expected_sha1
) < 0)
2125 *contents
= unpack_sha1_rest(&stream
, hdr
, *size
, expected_sha1
);
2127 error("unable to unpack contents of %s", path
);
2128 git_inflate_end(&stream
);
2131 if (check_sha1_signature(expected_sha1
, *contents
,
2132 *size
, typename(*type
))) {
2133 error("sha1 mismatch for %s (expected %s)", path
,
2134 sha1_to_hex(expected_sha1
));
2140 ret
= 0; /* everything checks out */
2144 munmap(map
, mapsize
);