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
[20];
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 const char *sha1_file_name(const unsigned char *sha1
)
256 static struct strbuf buf
= STRBUF_INIT
;
259 strbuf_addf(&buf
, "%s/", get_object_directory());
261 fill_sha1_path(&buf
, sha1
);
265 struct strbuf
*alt_scratch_buf(struct alternate_object_database
*alt
)
267 strbuf_setlen(&alt
->scratch
, alt
->base_len
);
268 return &alt
->scratch
;
271 static const char *alt_sha1_path(struct alternate_object_database
*alt
,
272 const unsigned char *sha1
)
274 struct strbuf
*buf
= alt_scratch_buf(alt
);
275 fill_sha1_path(buf
, sha1
);
279 struct alternate_object_database
*alt_odb_list
;
280 static struct alternate_object_database
**alt_odb_tail
;
283 * Return non-zero iff the path is usable as an alternate object database.
285 static int alt_odb_usable(struct strbuf
*path
, const char *normalized_objdir
)
287 struct alternate_object_database
*alt
;
289 /* Detect cases where alternate disappeared */
290 if (!is_directory(path
->buf
)) {
291 error("object directory %s does not exist; "
292 "check .git/objects/info/alternates.",
298 * Prevent the common mistake of listing the same
299 * thing twice, or object directory itself.
301 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
302 if (!fspathcmp(path
->buf
, alt
->path
))
305 if (!fspathcmp(path
->buf
, normalized_objdir
))
312 * Prepare alternate object database registry.
314 * The variable alt_odb_list points at the list of struct
315 * alternate_object_database. The elements on this list come from
316 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
317 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
318 * whose contents is similar to that environment variable but can be
319 * LF separated. Its base points at a statically allocated buffer that
320 * contains "/the/directory/corresponding/to/.git/objects/...", while
321 * its name points just after the slash at the end of ".git/objects/"
322 * in the example above, and has enough space to hold 40-byte hex
323 * SHA1, an extra slash for the first level indirection, and the
326 static void read_info_alternates(const char * relative_base
, int depth
);
327 static int link_alt_odb_entry(const char *entry
, const char *relative_base
,
328 int depth
, const char *normalized_objdir
)
330 struct alternate_object_database
*ent
;
331 struct strbuf pathbuf
= STRBUF_INIT
;
333 if (!is_absolute_path(entry
) && relative_base
) {
334 strbuf_realpath(&pathbuf
, relative_base
, 1);
335 strbuf_addch(&pathbuf
, '/');
337 strbuf_addstr(&pathbuf
, entry
);
339 if (strbuf_normalize_path(&pathbuf
) < 0 && relative_base
) {
340 error("unable to normalize alternate object path: %s",
342 strbuf_release(&pathbuf
);
347 * The trailing slash after the directory name is given by
348 * this function at the end. Remove duplicates.
350 while (pathbuf
.len
&& pathbuf
.buf
[pathbuf
.len
- 1] == '/')
351 strbuf_setlen(&pathbuf
, pathbuf
.len
- 1);
353 if (!alt_odb_usable(&pathbuf
, normalized_objdir
)) {
354 strbuf_release(&pathbuf
);
358 ent
= alloc_alt_odb(pathbuf
.buf
);
360 /* add the alternate entry */
362 alt_odb_tail
= &(ent
->next
);
365 /* recursively add alternates */
366 read_info_alternates(pathbuf
.buf
, depth
+ 1);
368 strbuf_release(&pathbuf
);
372 static const char *parse_alt_odb_entry(const char *string
,
380 if (*string
== '#') {
381 /* comment; consume up to next separator */
382 end
= strchrnul(string
, sep
);
383 } else if (*string
== '"' && !unquote_c_style(out
, string
, &end
)) {
385 * quoted path; unquote_c_style has copied the
386 * data for us and set "end". Broken quoting (e.g.,
387 * an entry that doesn't end with a quote) falls
388 * back to the unquoted case below.
391 /* normal, unquoted path */
392 end
= strchrnul(string
, sep
);
393 strbuf_add(out
, string
, end
- string
);
401 static void link_alt_odb_entries(const char *alt
, int len
, int sep
,
402 const char *relative_base
, int depth
)
404 struct strbuf objdirbuf
= STRBUF_INIT
;
405 struct strbuf entry
= STRBUF_INIT
;
408 error("%s: ignoring alternate object stores, nesting too deep.",
413 strbuf_add_absolute_path(&objdirbuf
, get_object_directory());
414 if (strbuf_normalize_path(&objdirbuf
) < 0)
415 die("unable to normalize object directory: %s",
419 alt
= parse_alt_odb_entry(alt
, sep
, &entry
);
422 link_alt_odb_entry(entry
.buf
, relative_base
, depth
, objdirbuf
.buf
);
424 strbuf_release(&entry
);
425 strbuf_release(&objdirbuf
);
428 static void read_info_alternates(const char * relative_base
, int depth
)
436 path
= xstrfmt("%s/info/alternates", relative_base
);
441 if (fstat(fd
, &st
) || (st
.st_size
== 0)) {
445 mapsz
= xsize_t(st
.st_size
);
446 map
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
449 link_alt_odb_entries(map
, mapsz
, '\n', relative_base
, depth
);
454 struct alternate_object_database
*alloc_alt_odb(const char *dir
)
456 struct alternate_object_database
*ent
;
458 FLEX_ALLOC_STR(ent
, path
, dir
);
459 strbuf_init(&ent
->scratch
, 0);
460 strbuf_addf(&ent
->scratch
, "%s/", dir
);
461 ent
->base_len
= ent
->scratch
.len
;
466 void add_to_alternates_file(const char *reference
)
468 struct lock_file
*lock
= xcalloc(1, sizeof(struct lock_file
));
469 char *alts
= git_pathdup("objects/info/alternates");
472 hold_lock_file_for_update(lock
, alts
, LOCK_DIE_ON_ERROR
);
473 out
= fdopen_lock_file(lock
, "w");
475 die_errno("unable to fdopen alternates lockfile");
477 in
= fopen(alts
, "r");
479 struct strbuf line
= STRBUF_INIT
;
482 while (strbuf_getline(&line
, in
) != EOF
) {
483 if (!strcmp(reference
, line
.buf
)) {
487 fprintf_or_die(out
, "%s\n", line
.buf
);
490 strbuf_release(&line
);
494 rollback_lock_file(lock
);
498 else if (errno
!= ENOENT
)
499 die_errno("unable to read alternates file");
502 fprintf_or_die(out
, "%s\n", reference
);
503 if (commit_lock_file(lock
))
504 die_errno("unable to move new alternates file into place");
506 link_alt_odb_entries(reference
, strlen(reference
), '\n', NULL
, 0);
511 void add_to_alternates_memory(const char *reference
)
514 * Make sure alternates are initialized, or else our entry may be
515 * overwritten when they are.
519 link_alt_odb_entries(reference
, strlen(reference
), '\n', NULL
, 0);
523 * Compute the exact path an alternate is at and returns it. In case of
524 * error NULL is returned and the human readable error is added to `err`
525 * `path` may be relative and should point to $GITDIR.
526 * `err` must not be null.
528 char *compute_alternate_path(const char *path
, struct strbuf
*err
)
530 char *ref_git
= NULL
;
531 const char *repo
, *ref_git_s
;
534 ref_git_s
= real_path_if_valid(path
);
537 strbuf_addf(err
, _("path '%s' does not exist"), path
);
541 * Beware: read_gitfile(), real_path() and mkpath()
542 * return static buffer
544 ref_git
= xstrdup(ref_git_s
);
546 repo
= read_gitfile(ref_git
);
548 repo
= read_gitfile(mkpath("%s/.git", ref_git
));
551 ref_git
= xstrdup(repo
);
554 if (!repo
&& is_directory(mkpath("%s/.git/objects", ref_git
))) {
555 char *ref_git_git
= mkpathdup("%s/.git", ref_git
);
557 ref_git
= ref_git_git
;
558 } else if (!is_directory(mkpath("%s/objects", ref_git
))) {
559 struct strbuf sb
= STRBUF_INIT
;
561 if (get_common_dir(&sb
, ref_git
)) {
563 _("reference repository '%s' as a linked "
564 "checkout is not supported yet."),
569 strbuf_addf(err
, _("reference repository '%s' is not a "
570 "local repository."), path
);
574 if (!access(mkpath("%s/shallow", ref_git
), F_OK
)) {
575 strbuf_addf(err
, _("reference repository '%s' is shallow"),
581 if (!access(mkpath("%s/info/grafts", ref_git
), F_OK
)) {
583 _("reference repository '%s' is grafted"),
591 FREE_AND_NULL(ref_git
);
597 int foreach_alt_odb(alt_odb_fn fn
, void *cb
)
599 struct alternate_object_database
*ent
;
603 for (ent
= alt_odb_list
; ent
; ent
= ent
->next
) {
611 void prepare_alt_odb(void)
618 alt
= getenv(ALTERNATE_DB_ENVIRONMENT
);
621 alt_odb_tail
= &alt_odb_list
;
622 link_alt_odb_entries(alt
, strlen(alt
), PATH_SEP
, NULL
, 0);
624 read_info_alternates(get_object_directory(), 0);
627 /* Returns 1 if we have successfully freshened the file, 0 otherwise. */
628 static int freshen_file(const char *fn
)
631 t
.actime
= t
.modtime
= time(NULL
);
632 return !utime(fn
, &t
);
636 * All of the check_and_freshen functions return 1 if the file exists and was
637 * freshened (if freshening was requested), 0 otherwise. If they return
638 * 0, you should not assume that it is safe to skip a write of the object (it
639 * either does not exist on disk, or has a stale mtime and may be subject to
642 int check_and_freshen_file(const char *fn
, int freshen
)
644 if (access(fn
, F_OK
))
646 if (freshen
&& !freshen_file(fn
))
651 static int check_and_freshen_local(const unsigned char *sha1
, int freshen
)
653 return check_and_freshen_file(sha1_file_name(sha1
), freshen
);
656 static int check_and_freshen_nonlocal(const unsigned char *sha1
, int freshen
)
658 struct alternate_object_database
*alt
;
660 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
661 const char *path
= alt_sha1_path(alt
, sha1
);
662 if (check_and_freshen_file(path
, freshen
))
668 static int check_and_freshen(const unsigned char *sha1
, int freshen
)
670 return check_and_freshen_local(sha1
, freshen
) ||
671 check_and_freshen_nonlocal(sha1
, freshen
);
674 int has_loose_object_nonlocal(const unsigned char *sha1
)
676 return check_and_freshen_nonlocal(sha1
, 0);
679 static int has_loose_object(const unsigned char *sha1
)
681 return check_and_freshen(sha1
, 0);
684 static void mmap_limit_check(size_t length
)
686 static size_t limit
= 0;
688 limit
= git_env_ulong("GIT_MMAP_LIMIT", 0);
693 die("attempting to mmap %"PRIuMAX
" over limit %"PRIuMAX
,
694 (uintmax_t)length
, (uintmax_t)limit
);
697 void *xmmap_gently(void *start
, size_t length
,
698 int prot
, int flags
, int fd
, off_t offset
)
702 mmap_limit_check(length
);
703 ret
= mmap(start
, length
, prot
, flags
, fd
, offset
);
704 if (ret
== MAP_FAILED
) {
707 release_pack_memory(length
);
708 ret
= mmap(start
, length
, prot
, flags
, fd
, offset
);
713 void *xmmap(void *start
, size_t length
,
714 int prot
, int flags
, int fd
, off_t offset
)
716 void *ret
= xmmap_gently(start
, length
, prot
, flags
, fd
, offset
);
717 if (ret
== MAP_FAILED
)
718 die_errno("mmap failed");
722 static void mark_bad_packed_object(struct packed_git
*p
,
723 const unsigned char *sha1
)
726 for (i
= 0; i
< p
->num_bad_objects
; i
++)
727 if (!hashcmp(sha1
, p
->bad_object_sha1
+ GIT_SHA1_RAWSZ
* i
))
729 p
->bad_object_sha1
= xrealloc(p
->bad_object_sha1
,
730 st_mult(GIT_MAX_RAWSZ
,
731 st_add(p
->num_bad_objects
, 1)));
732 hashcpy(p
->bad_object_sha1
+ GIT_SHA1_RAWSZ
* p
->num_bad_objects
, sha1
);
733 p
->num_bad_objects
++;
736 static const struct packed_git
*has_packed_and_bad(const unsigned char *sha1
)
738 struct packed_git
*p
;
741 for (p
= packed_git
; p
; p
= p
->next
)
742 for (i
= 0; i
< p
->num_bad_objects
; i
++)
743 if (!hashcmp(sha1
, p
->bad_object_sha1
+ 20 * i
))
749 * With an in-core object data in "map", rehash it to make sure the
750 * object name actually matches "sha1" to detect object corruption.
751 * With "map" == NULL, try reading the object named with "sha1" using
752 * the streaming interface and rehash it to do the same.
754 int check_sha1_signature(const unsigned char *sha1
, void *map
,
755 unsigned long size
, const char *type
)
757 unsigned char real_sha1
[20];
758 enum object_type obj_type
;
759 struct git_istream
*st
;
765 hash_sha1_file(map
, size
, type
, real_sha1
);
766 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
769 st
= open_istream(sha1
, &obj_type
, &size
, NULL
);
773 /* Generate the header */
774 hdrlen
= xsnprintf(hdr
, sizeof(hdr
), "%s %lu", typename(obj_type
), size
) + 1;
778 git_SHA1_Update(&c
, hdr
, hdrlen
);
781 ssize_t readlen
= read_istream(st
, buf
, sizeof(buf
));
789 git_SHA1_Update(&c
, buf
, readlen
);
791 git_SHA1_Final(real_sha1
, &c
);
793 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
796 int git_open_cloexec(const char *name
, int flags
)
799 static int o_cloexec
= O_CLOEXEC
;
801 fd
= open(name
, flags
| o_cloexec
);
802 if ((o_cloexec
& O_CLOEXEC
) && fd
< 0 && errno
== EINVAL
) {
803 /* Try again w/o O_CLOEXEC: the kernel might not support it */
804 o_cloexec
&= ~O_CLOEXEC
;
805 fd
= open(name
, flags
| o_cloexec
);
808 #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
810 static int fd_cloexec
= FD_CLOEXEC
;
812 if (!o_cloexec
&& 0 <= fd
&& fd_cloexec
) {
813 /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
814 int flags
= fcntl(fd
, F_GETFD
);
815 if (fcntl(fd
, F_SETFD
, flags
| fd_cloexec
))
824 * Find "sha1" as a loose object in the local repository or in an alternate.
825 * Returns 0 on success, negative on failure.
827 * The "path" out-parameter will give the path of the object we found (if any).
828 * Note that it may point to static storage and is only valid until another
829 * call to sha1_file_name(), etc.
831 static int stat_sha1_file(const unsigned char *sha1
, struct stat
*st
,
834 struct alternate_object_database
*alt
;
836 *path
= sha1_file_name(sha1
);
837 if (!lstat(*path
, st
))
842 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
843 *path
= alt_sha1_path(alt
, sha1
);
844 if (!lstat(*path
, st
))
852 * Like stat_sha1_file(), but actually open the object and return the
853 * descriptor. See the caveats on the "path" parameter above.
855 static int open_sha1_file(const unsigned char *sha1
, const char **path
)
858 struct alternate_object_database
*alt
;
859 int most_interesting_errno
;
861 *path
= sha1_file_name(sha1
);
862 fd
= git_open(*path
);
865 most_interesting_errno
= errno
;
868 for (alt
= alt_odb_list
; alt
; alt
= alt
->next
) {
869 *path
= alt_sha1_path(alt
, sha1
);
870 fd
= git_open(*path
);
873 if (most_interesting_errno
== ENOENT
)
874 most_interesting_errno
= errno
;
876 errno
= most_interesting_errno
;
881 * Map the loose object at "path" if it is not NULL, or the path found by
882 * searching for a loose object named "sha1".
884 static void *map_sha1_file_1(const char *path
,
885 const unsigned char *sha1
,
894 fd
= open_sha1_file(sha1
, &path
);
899 if (!fstat(fd
, &st
)) {
900 *size
= xsize_t(st
.st_size
);
902 /* mmap() is forbidden on empty files */
903 error("object file %s is empty", path
);
906 map
= xmmap(NULL
, *size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
913 void *map_sha1_file(const unsigned char *sha1
, unsigned long *size
)
915 return map_sha1_file_1(NULL
, sha1
, size
);
918 static int unpack_sha1_short_header(git_zstream
*stream
,
919 unsigned char *map
, unsigned long mapsize
,
920 void *buffer
, unsigned long bufsiz
)
922 /* Get the data stream */
923 memset(stream
, 0, sizeof(*stream
));
924 stream
->next_in
= map
;
925 stream
->avail_in
= mapsize
;
926 stream
->next_out
= buffer
;
927 stream
->avail_out
= bufsiz
;
929 git_inflate_init(stream
);
930 return git_inflate(stream
, 0);
933 int unpack_sha1_header(git_zstream
*stream
,
934 unsigned char *map
, unsigned long mapsize
,
935 void *buffer
, unsigned long bufsiz
)
937 int status
= unpack_sha1_short_header(stream
, map
, mapsize
,
943 /* Make sure we have the terminating NUL */
944 if (!memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
949 static int unpack_sha1_header_to_strbuf(git_zstream
*stream
, unsigned char *map
,
950 unsigned long mapsize
, void *buffer
,
951 unsigned long bufsiz
, struct strbuf
*header
)
955 status
= unpack_sha1_short_header(stream
, map
, mapsize
, buffer
, bufsiz
);
960 * Check if entire header is unpacked in the first iteration.
962 if (memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
966 * buffer[0..bufsiz] was not large enough. Copy the partial
967 * result out to header, and then append the result of further
968 * reading the stream.
970 strbuf_add(header
, buffer
, stream
->next_out
- (unsigned char *)buffer
);
971 stream
->next_out
= buffer
;
972 stream
->avail_out
= bufsiz
;
975 status
= git_inflate(stream
, 0);
976 strbuf_add(header
, buffer
, stream
->next_out
- (unsigned char *)buffer
);
977 if (memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
979 stream
->next_out
= buffer
;
980 stream
->avail_out
= bufsiz
;
981 } while (status
!= Z_STREAM_END
);
985 static void *unpack_sha1_rest(git_zstream
*stream
, void *buffer
, unsigned long size
, const unsigned char *sha1
)
987 int bytes
= strlen(buffer
) + 1;
988 unsigned char *buf
= xmallocz(size
);
992 n
= stream
->total_out
- bytes
;
995 memcpy(buf
, (char *) buffer
+ bytes
, n
);
999 * The above condition must be (bytes <= size), not
1000 * (bytes < size). In other words, even though we
1001 * expect no more output and set avail_out to zero,
1002 * the input zlib stream may have bytes that express
1003 * "this concludes the stream", and we *do* want to
1006 * Otherwise we would not be able to test that we
1007 * consumed all the input to reach the expected size;
1008 * we also want to check that zlib tells us that all
1009 * went well with status == Z_STREAM_END at the end.
1011 stream
->next_out
= buf
+ bytes
;
1012 stream
->avail_out
= size
- bytes
;
1013 while (status
== Z_OK
)
1014 status
= git_inflate(stream
, Z_FINISH
);
1016 if (status
== Z_STREAM_END
&& !stream
->avail_in
) {
1017 git_inflate_end(stream
);
1022 error("corrupt loose object '%s'", sha1_to_hex(sha1
));
1023 else if (stream
->avail_in
)
1024 error("garbage at end of loose object '%s'",
1031 * We used to just use "sscanf()", but that's actually way
1032 * too permissive for what we want to check. So do an anal
1033 * object header parse by hand.
1035 static int parse_sha1_header_extended(const char *hdr
, struct object_info
*oi
,
1038 const char *type_buf
= hdr
;
1040 int type
, type_len
= 0;
1043 * The type can be of any size but is followed by
1055 type
= type_from_string_gently(type_buf
, type_len
, 1);
1057 strbuf_add(oi
->typename
, type_buf
, type_len
);
1059 * Set type to 0 if its an unknown object and
1060 * we're obtaining the type using '--allow-unknown-type'
1063 if ((flags
& OBJECT_INFO_ALLOW_UNKNOWN_TYPE
) && (type
< 0))
1066 die("invalid object type");
1071 * The length must follow immediately, and be in canonical
1072 * decimal format (ie "010" is not valid).
1074 size
= *hdr
++ - '0';
1079 unsigned long c
= *hdr
- '0';
1083 size
= size
* 10 + c
;
1091 * The length must be followed by a zero byte
1093 return *hdr
? -1 : type
;
1096 int parse_sha1_header(const char *hdr
, unsigned long *sizep
)
1098 struct object_info oi
= OBJECT_INFO_INIT
;
1101 return parse_sha1_header_extended(hdr
, &oi
, 0);
1104 static off_t
get_delta_base(struct packed_git
*p
,
1105 struct pack_window
**w_curs
,
1107 enum object_type type
,
1108 off_t delta_obj_offset
)
1110 unsigned char *base_info
= use_pack(p
, w_curs
, *curpos
, NULL
);
1113 /* use_pack() assured us we have [base_info, base_info + 20)
1114 * as a range that we can look at without walking off the
1115 * end of the mapped window. Its actually the hash size
1116 * that is assured. An OFS_DELTA longer than the hash size
1117 * is stupid, as then a REF_DELTA would be smaller to store.
1119 if (type
== OBJ_OFS_DELTA
) {
1121 unsigned char c
= base_info
[used
++];
1122 base_offset
= c
& 127;
1125 if (!base_offset
|| MSB(base_offset
, 7))
1126 return 0; /* overflow */
1127 c
= base_info
[used
++];
1128 base_offset
= (base_offset
<< 7) + (c
& 127);
1130 base_offset
= delta_obj_offset
- base_offset
;
1131 if (base_offset
<= 0 || base_offset
>= delta_obj_offset
)
1132 return 0; /* out of bound */
1134 } else if (type
== OBJ_REF_DELTA
) {
1135 /* The base entry _must_ be in the same pack */
1136 base_offset
= find_pack_entry_one(base_info
, p
);
1139 die("I am totally screwed");
1144 * Like get_delta_base above, but we return the sha1 instead of the pack
1145 * offset. This means it is cheaper for REF deltas (we do not have to do
1146 * the final object lookup), but more expensive for OFS deltas (we
1147 * have to load the revidx to convert the offset back into a sha1).
1149 static const unsigned char *get_delta_base_sha1(struct packed_git
*p
,
1150 struct pack_window
**w_curs
,
1152 enum object_type type
,
1153 off_t delta_obj_offset
)
1155 if (type
== OBJ_REF_DELTA
) {
1156 unsigned char *base
= use_pack(p
, w_curs
, curpos
, NULL
);
1158 } else if (type
== OBJ_OFS_DELTA
) {
1159 struct revindex_entry
*revidx
;
1160 off_t base_offset
= get_delta_base(p
, w_curs
, &curpos
,
1161 type
, delta_obj_offset
);
1166 revidx
= find_pack_revindex(p
, base_offset
);
1170 return nth_packed_object_sha1(p
, revidx
->nr
);
1175 static int retry_bad_packed_offset(struct packed_git
*p
, off_t obj_offset
)
1178 struct revindex_entry
*revidx
;
1179 const unsigned char *sha1
;
1180 revidx
= find_pack_revindex(p
, obj_offset
);
1183 sha1
= nth_packed_object_sha1(p
, revidx
->nr
);
1184 mark_bad_packed_object(p
, sha1
);
1185 type
= sha1_object_info(sha1
, NULL
);
1186 if (type
<= OBJ_NONE
)
1191 #define POI_STACK_PREALLOC 64
1193 static enum object_type
packed_to_object_type(struct packed_git
*p
,
1195 enum object_type type
,
1196 struct pack_window
**w_curs
,
1199 off_t small_poi_stack
[POI_STACK_PREALLOC
];
1200 off_t
*poi_stack
= small_poi_stack
;
1201 int poi_stack_nr
= 0, poi_stack_alloc
= POI_STACK_PREALLOC
;
1203 while (type
== OBJ_OFS_DELTA
|| type
== OBJ_REF_DELTA
) {
1206 /* Push the object we're going to leave behind */
1207 if (poi_stack_nr
>= poi_stack_alloc
&& poi_stack
== small_poi_stack
) {
1208 poi_stack_alloc
= alloc_nr(poi_stack_nr
);
1209 ALLOC_ARRAY(poi_stack
, poi_stack_alloc
);
1210 memcpy(poi_stack
, small_poi_stack
, sizeof(off_t
)*poi_stack_nr
);
1212 ALLOC_GROW(poi_stack
, poi_stack_nr
+1, poi_stack_alloc
);
1214 poi_stack
[poi_stack_nr
++] = obj_offset
;
1215 /* If parsing the base offset fails, just unwind */
1216 base_offset
= get_delta_base(p
, w_curs
, &curpos
, type
, obj_offset
);
1219 curpos
= obj_offset
= base_offset
;
1220 type
= unpack_object_header(p
, w_curs
, &curpos
, &size
);
1221 if (type
<= OBJ_NONE
) {
1222 /* If getting the base itself fails, we first
1223 * retry the base, otherwise unwind */
1224 type
= retry_bad_packed_offset(p
, base_offset
);
1225 if (type
> OBJ_NONE
)
1239 error("unknown object type %i at offset %"PRIuMAX
" in %s",
1240 type
, (uintmax_t)obj_offset
, p
->pack_name
);
1245 if (poi_stack
!= small_poi_stack
)
1250 while (poi_stack_nr
) {
1251 obj_offset
= poi_stack
[--poi_stack_nr
];
1252 type
= retry_bad_packed_offset(p
, obj_offset
);
1253 if (type
> OBJ_NONE
)
1260 static struct hashmap delta_base_cache
;
1261 static size_t delta_base_cached
;
1263 static LIST_HEAD(delta_base_cache_lru
);
1265 struct delta_base_cache_key
{
1266 struct packed_git
*p
;
1270 struct delta_base_cache_entry
{
1271 struct hashmap hash
;
1272 struct delta_base_cache_key key
;
1273 struct list_head lru
;
1276 enum object_type type
;
1279 static unsigned int pack_entry_hash(struct packed_git
*p
, off_t base_offset
)
1283 hash
= (unsigned int)(intptr_t)p
+ (unsigned int)base_offset
;
1284 hash
+= (hash
>> 8) + (hash
>> 16);
1288 static struct delta_base_cache_entry
*
1289 get_delta_base_cache_entry(struct packed_git
*p
, off_t base_offset
)
1291 struct hashmap_entry entry
;
1292 struct delta_base_cache_key key
;
1294 if (!delta_base_cache
.cmpfn
)
1297 hashmap_entry_init(&entry
, pack_entry_hash(p
, base_offset
));
1299 key
.base_offset
= base_offset
;
1300 return hashmap_get(&delta_base_cache
, &entry
, &key
);
1303 static int delta_base_cache_key_eq(const struct delta_base_cache_key
*a
,
1304 const struct delta_base_cache_key
*b
)
1306 return a
->p
== b
->p
&& a
->base_offset
== b
->base_offset
;
1309 static int delta_base_cache_hash_cmp(const void *unused_cmp_data
,
1310 const void *va
, const void *vb
,
1313 const struct delta_base_cache_entry
*a
= va
, *b
= vb
;
1314 const struct delta_base_cache_key
*key
= vkey
;
1316 return !delta_base_cache_key_eq(&a
->key
, key
);
1318 return !delta_base_cache_key_eq(&a
->key
, &b
->key
);
1321 static int in_delta_base_cache(struct packed_git
*p
, off_t base_offset
)
1323 return !!get_delta_base_cache_entry(p
, base_offset
);
1327 * Remove the entry from the cache, but do _not_ free the associated
1328 * entry data. The caller takes ownership of the "data" buffer, and
1329 * should copy out any fields it wants before detaching.
1331 static void detach_delta_base_cache_entry(struct delta_base_cache_entry
*ent
)
1333 hashmap_remove(&delta_base_cache
, ent
, &ent
->key
);
1334 list_del(&ent
->lru
);
1335 delta_base_cached
-= ent
->size
;
1339 static void *cache_or_unpack_entry(struct packed_git
*p
, off_t base_offset
,
1340 unsigned long *base_size
, enum object_type
*type
)
1342 struct delta_base_cache_entry
*ent
;
1344 ent
= get_delta_base_cache_entry(p
, base_offset
);
1346 return unpack_entry(p
, base_offset
, type
, base_size
);
1351 *base_size
= ent
->size
;
1352 return xmemdupz(ent
->data
, ent
->size
);
1355 static inline void release_delta_base_cache(struct delta_base_cache_entry
*ent
)
1358 detach_delta_base_cache_entry(ent
);
1361 void clear_delta_base_cache(void)
1363 struct list_head
*lru
, *tmp
;
1364 list_for_each_safe(lru
, tmp
, &delta_base_cache_lru
) {
1365 struct delta_base_cache_entry
*entry
=
1366 list_entry(lru
, struct delta_base_cache_entry
, lru
);
1367 release_delta_base_cache(entry
);
1371 static void add_delta_base_cache(struct packed_git
*p
, off_t base_offset
,
1372 void *base
, unsigned long base_size
, enum object_type type
)
1374 struct delta_base_cache_entry
*ent
= xmalloc(sizeof(*ent
));
1375 struct list_head
*lru
, *tmp
;
1377 delta_base_cached
+= base_size
;
1379 list_for_each_safe(lru
, tmp
, &delta_base_cache_lru
) {
1380 struct delta_base_cache_entry
*f
=
1381 list_entry(lru
, struct delta_base_cache_entry
, lru
);
1382 if (delta_base_cached
<= delta_base_cache_limit
)
1384 release_delta_base_cache(f
);
1388 ent
->key
.base_offset
= base_offset
;
1391 ent
->size
= base_size
;
1392 list_add_tail(&ent
->lru
, &delta_base_cache_lru
);
1394 if (!delta_base_cache
.cmpfn
)
1395 hashmap_init(&delta_base_cache
, delta_base_cache_hash_cmp
, NULL
, 0);
1396 hashmap_entry_init(ent
, pack_entry_hash(p
, base_offset
));
1397 hashmap_add(&delta_base_cache
, ent
);
1400 int packed_object_info(struct packed_git
*p
, off_t obj_offset
,
1401 struct object_info
*oi
)
1403 struct pack_window
*w_curs
= NULL
;
1405 off_t curpos
= obj_offset
;
1406 enum object_type type
;
1409 * We always get the representation type, but only convert it to
1410 * a "real" type later if the caller is interested.
1413 *oi
->contentp
= cache_or_unpack_entry(p
, obj_offset
, oi
->sizep
,
1418 type
= unpack_object_header(p
, &w_curs
, &curpos
, &size
);
1421 if (!oi
->contentp
&& oi
->sizep
) {
1422 if (type
== OBJ_OFS_DELTA
|| type
== OBJ_REF_DELTA
) {
1423 off_t tmp_pos
= curpos
;
1424 off_t base_offset
= get_delta_base(p
, &w_curs
, &tmp_pos
,
1430 *oi
->sizep
= get_size_from_delta(p
, &w_curs
, tmp_pos
);
1431 if (*oi
->sizep
== 0) {
1440 if (oi
->disk_sizep
) {
1441 struct revindex_entry
*revidx
= find_pack_revindex(p
, obj_offset
);
1442 *oi
->disk_sizep
= revidx
[1].offset
- obj_offset
;
1445 if (oi
->typep
|| oi
->typename
) {
1446 enum object_type ptot
;
1447 ptot
= packed_to_object_type(p
, obj_offset
, type
, &w_curs
,
1452 const char *tn
= typename(ptot
);
1454 strbuf_addstr(oi
->typename
, tn
);
1462 if (oi
->delta_base_sha1
) {
1463 if (type
== OBJ_OFS_DELTA
|| type
== OBJ_REF_DELTA
) {
1464 const unsigned char *base
;
1466 base
= get_delta_base_sha1(p
, &w_curs
, curpos
,
1473 hashcpy(oi
->delta_base_sha1
, base
);
1475 hashclr(oi
->delta_base_sha1
);
1478 oi
->whence
= in_delta_base_cache(p
, obj_offset
) ? OI_DBCACHED
:
1482 unuse_pack(&w_curs
);
1486 static void *unpack_compressed_entry(struct packed_git
*p
,
1487 struct pack_window
**w_curs
,
1493 unsigned char *buffer
, *in
;
1495 buffer
= xmallocz_gently(size
);
1498 memset(&stream
, 0, sizeof(stream
));
1499 stream
.next_out
= buffer
;
1500 stream
.avail_out
= size
+ 1;
1502 git_inflate_init(&stream
);
1504 in
= use_pack(p
, w_curs
, curpos
, &stream
.avail_in
);
1505 stream
.next_in
= in
;
1506 st
= git_inflate(&stream
, Z_FINISH
);
1507 if (!stream
.avail_out
)
1508 break; /* the payload is larger than it should be */
1509 curpos
+= stream
.next_in
- in
;
1510 } while (st
== Z_OK
|| st
== Z_BUF_ERROR
);
1511 git_inflate_end(&stream
);
1512 if ((st
!= Z_STREAM_END
) || stream
.total_out
!= size
) {
1520 static void *read_object(const unsigned char *sha1
, enum object_type
*type
,
1521 unsigned long *size
);
1523 static void write_pack_access_log(struct packed_git
*p
, off_t obj_offset
)
1525 static struct trace_key pack_access
= TRACE_KEY_INIT(PACK_ACCESS
);
1526 trace_printf_key(&pack_access
, "%s %"PRIuMAX
"\n",
1527 p
->pack_name
, (uintmax_t)obj_offset
);
1530 int do_check_packed_object_crc
;
1532 #define UNPACK_ENTRY_STACK_PREALLOC 64
1533 struct unpack_entry_stack_ent
{
1539 void *unpack_entry(struct packed_git
*p
, off_t obj_offset
,
1540 enum object_type
*final_type
, unsigned long *final_size
)
1542 struct pack_window
*w_curs
= NULL
;
1543 off_t curpos
= obj_offset
;
1546 enum object_type type
;
1547 struct unpack_entry_stack_ent small_delta_stack
[UNPACK_ENTRY_STACK_PREALLOC
];
1548 struct unpack_entry_stack_ent
*delta_stack
= small_delta_stack
;
1549 int delta_stack_nr
= 0, delta_stack_alloc
= UNPACK_ENTRY_STACK_PREALLOC
;
1550 int base_from_cache
= 0;
1552 write_pack_access_log(p
, obj_offset
);
1554 /* PHASE 1: drill down to the innermost base object */
1558 struct delta_base_cache_entry
*ent
;
1560 ent
= get_delta_base_cache_entry(p
, curpos
);
1565 detach_delta_base_cache_entry(ent
);
1566 base_from_cache
= 1;
1570 if (do_check_packed_object_crc
&& p
->index_version
> 1) {
1571 struct revindex_entry
*revidx
= find_pack_revindex(p
, obj_offset
);
1572 off_t len
= revidx
[1].offset
- obj_offset
;
1573 if (check_pack_crc(p
, &w_curs
, obj_offset
, len
, revidx
->nr
)) {
1574 const unsigned char *sha1
=
1575 nth_packed_object_sha1(p
, revidx
->nr
);
1576 error("bad packed object CRC for %s",
1578 mark_bad_packed_object(p
, sha1
);
1584 type
= unpack_object_header(p
, &w_curs
, &curpos
, &size
);
1585 if (type
!= OBJ_OFS_DELTA
&& type
!= OBJ_REF_DELTA
)
1588 base_offset
= get_delta_base(p
, &w_curs
, &curpos
, type
, obj_offset
);
1590 error("failed to validate delta base reference "
1591 "at offset %"PRIuMAX
" from %s",
1592 (uintmax_t)curpos
, p
->pack_name
);
1593 /* bail to phase 2, in hopes of recovery */
1598 /* push object, proceed to base */
1599 if (delta_stack_nr
>= delta_stack_alloc
1600 && delta_stack
== small_delta_stack
) {
1601 delta_stack_alloc
= alloc_nr(delta_stack_nr
);
1602 ALLOC_ARRAY(delta_stack
, delta_stack_alloc
);
1603 memcpy(delta_stack
, small_delta_stack
,
1604 sizeof(*delta_stack
)*delta_stack_nr
);
1606 ALLOC_GROW(delta_stack
, delta_stack_nr
+1, delta_stack_alloc
);
1608 i
= delta_stack_nr
++;
1609 delta_stack
[i
].obj_offset
= obj_offset
;
1610 delta_stack
[i
].curpos
= curpos
;
1611 delta_stack
[i
].size
= size
;
1613 curpos
= obj_offset
= base_offset
;
1616 /* PHASE 2: handle the base */
1621 die("BUG: unpack_entry: left loop at a valid delta");
1627 if (!base_from_cache
)
1628 data
= unpack_compressed_entry(p
, &w_curs
, curpos
, size
);
1632 error("unknown object type %i at offset %"PRIuMAX
" in %s",
1633 type
, (uintmax_t)obj_offset
, p
->pack_name
);
1636 /* PHASE 3: apply deltas in order */
1639 * 'data' holds the base data, or NULL if there was corruption
1641 while (delta_stack_nr
) {
1644 void *external_base
= NULL
;
1645 unsigned long delta_size
, base_size
= size
;
1651 add_delta_base_cache(p
, obj_offset
, base
, base_size
, type
);
1655 * We're probably in deep shit, but let's try to fetch
1656 * the required base anyway from another pack or loose.
1657 * This is costly but should happen only in the presence
1658 * of a corrupted pack, and is better than failing outright.
1660 struct revindex_entry
*revidx
;
1661 const unsigned char *base_sha1
;
1662 revidx
= find_pack_revindex(p
, obj_offset
);
1664 base_sha1
= nth_packed_object_sha1(p
, revidx
->nr
);
1665 error("failed to read delta base object %s"
1666 " at offset %"PRIuMAX
" from %s",
1667 sha1_to_hex(base_sha1
), (uintmax_t)obj_offset
,
1669 mark_bad_packed_object(p
, base_sha1
);
1670 base
= read_object(base_sha1
, &type
, &base_size
);
1671 external_base
= base
;
1675 i
= --delta_stack_nr
;
1676 obj_offset
= delta_stack
[i
].obj_offset
;
1677 curpos
= delta_stack
[i
].curpos
;
1678 delta_size
= delta_stack
[i
].size
;
1683 delta_data
= unpack_compressed_entry(p
, &w_curs
, curpos
, delta_size
);
1686 error("failed to unpack compressed delta "
1687 "at offset %"PRIuMAX
" from %s",
1688 (uintmax_t)curpos
, p
->pack_name
);
1690 free(external_base
);
1694 data
= patch_delta(base
, base_size
,
1695 delta_data
, delta_size
,
1699 * We could not apply the delta; warn the user, but keep going.
1700 * Our failure will be noticed either in the next iteration of
1701 * the loop, or if this is the final delta, in the caller when
1702 * we return NULL. Those code paths will take care of making
1703 * a more explicit warning and retrying with another copy of
1707 error("failed to apply delta");
1710 free(external_base
);
1719 unuse_pack(&w_curs
);
1721 if (delta_stack
!= small_delta_stack
)
1727 const unsigned char *nth_packed_object_sha1(struct packed_git
*p
,
1730 const unsigned char *index
= p
->index_data
;
1732 if (open_pack_index(p
))
1734 index
= p
->index_data
;
1736 if (n
>= p
->num_objects
)
1739 if (p
->index_version
== 1) {
1740 return index
+ 24 * n
+ 4;
1743 return index
+ 20 * n
;
1747 const struct object_id
*nth_packed_object_oid(struct object_id
*oid
,
1748 struct packed_git
*p
,
1751 const unsigned char *hash
= nth_packed_object_sha1(p
, n
);
1754 hashcpy(oid
->hash
, hash
);
1758 void check_pack_index_ptr(const struct packed_git
*p
, const void *vptr
)
1760 const unsigned char *ptr
= vptr
;
1761 const unsigned char *start
= p
->index_data
;
1762 const unsigned char *end
= start
+ p
->index_size
;
1764 die(_("offset before start of pack index for %s (corrupt index?)"),
1766 /* No need to check for underflow; .idx files must be at least 8 bytes */
1768 die(_("offset beyond end of pack index for %s (truncated index?)"),
1772 off_t
nth_packed_object_offset(const struct packed_git
*p
, uint32_t n
)
1774 const unsigned char *index
= p
->index_data
;
1776 if (p
->index_version
== 1) {
1777 return ntohl(*((uint32_t *)(index
+ 24 * n
)));
1780 index
+= 8 + p
->num_objects
* (20 + 4);
1781 off
= ntohl(*((uint32_t *)(index
+ 4 * n
)));
1782 if (!(off
& 0x80000000))
1784 index
+= p
->num_objects
* 4 + (off
& 0x7fffffff) * 8;
1785 check_pack_index_ptr(p
, index
);
1786 return (((uint64_t)ntohl(*((uint32_t *)(index
+ 0)))) << 32) |
1787 ntohl(*((uint32_t *)(index
+ 4)));
1791 off_t
find_pack_entry_one(const unsigned char *sha1
,
1792 struct packed_git
*p
)
1794 const uint32_t *level1_ofs
= p
->index_data
;
1795 const unsigned char *index
= p
->index_data
;
1796 unsigned hi
, lo
, stride
;
1797 static int debug_lookup
= -1;
1799 if (debug_lookup
< 0)
1800 debug_lookup
= !!getenv("GIT_DEBUG_LOOKUP");
1803 if (open_pack_index(p
))
1805 level1_ofs
= p
->index_data
;
1806 index
= p
->index_data
;
1808 if (p
->index_version
> 1) {
1813 hi
= ntohl(level1_ofs
[*sha1
]);
1814 lo
= ((*sha1
== 0x0) ? 0 : ntohl(level1_ofs
[*sha1
- 1]));
1815 if (p
->index_version
> 1) {
1823 printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32
"\n",
1824 sha1
[0], sha1
[1], sha1
[2], lo
, hi
, p
->num_objects
);
1827 unsigned mi
= (lo
+ hi
) / 2;
1828 int cmp
= hashcmp(index
+ mi
* stride
, sha1
);
1831 printf("lo %u hi %u rg %u mi %u\n",
1832 lo
, hi
, hi
- lo
, mi
);
1834 return nth_packed_object_offset(p
, mi
);
1843 int is_pack_valid(struct packed_git
*p
)
1845 /* An already open pack is known to be valid. */
1846 if (p
->pack_fd
!= -1)
1849 /* If the pack has one window completely covering the
1850 * file size, the pack is known to be valid even if
1851 * the descriptor is not currently open.
1854 struct pack_window
*w
= p
->windows
;
1856 if (!w
->offset
&& w
->len
== p
->pack_size
)
1860 /* Force the pack to open to prove its valid. */
1861 return !open_packed_git(p
);
1864 static int fill_pack_entry(const unsigned char *sha1
,
1865 struct pack_entry
*e
,
1866 struct packed_git
*p
)
1870 if (p
->num_bad_objects
) {
1872 for (i
= 0; i
< p
->num_bad_objects
; i
++)
1873 if (!hashcmp(sha1
, p
->bad_object_sha1
+ 20 * i
))
1877 offset
= find_pack_entry_one(sha1
, p
);
1882 * We are about to tell the caller where they can locate the
1883 * requested object. We better make sure the packfile is
1884 * still here and can be accessed before supplying that
1885 * answer, as it may have been deleted since the index was
1888 if (!is_pack_valid(p
))
1892 hashcpy(e
->sha1
, sha1
);
1897 * Iff a pack file contains the object named by sha1, return true and
1898 * store its location to e.
1900 static int find_pack_entry(const unsigned char *sha1
, struct pack_entry
*e
)
1902 struct mru_entry
*p
;
1904 prepare_packed_git();
1908 for (p
= packed_git_mru
->head
; p
; p
= p
->next
) {
1909 if (fill_pack_entry(sha1
, e
, p
->item
)) {
1910 mru_mark(packed_git_mru
, p
);
1917 struct packed_git
*find_sha1_pack(const unsigned char *sha1
,
1918 struct packed_git
*packs
)
1920 struct packed_git
*p
;
1922 for (p
= packs
; p
; p
= p
->next
) {
1923 if (find_pack_entry_one(sha1
, p
))
1930 static int sha1_loose_object_info(const unsigned char *sha1
,
1931 struct object_info
*oi
,
1935 unsigned long mapsize
;
1939 struct strbuf hdrbuf
= STRBUF_INIT
;
1940 unsigned long size_scratch
;
1942 if (oi
->delta_base_sha1
)
1943 hashclr(oi
->delta_base_sha1
);
1946 * If we don't care about type or size, then we don't
1947 * need to look inside the object at all. Note that we
1948 * do not optimize out the stat call, even if the
1949 * caller doesn't care about the disk-size, since our
1950 * return value implicitly indicates whether the
1951 * object even exists.
1953 if (!oi
->typep
&& !oi
->typename
&& !oi
->sizep
&& !oi
->contentp
) {
1956 if (stat_sha1_file(sha1
, &st
, &path
) < 0)
1959 *oi
->disk_sizep
= st
.st_size
;
1963 map
= map_sha1_file(sha1
, &mapsize
);
1968 oi
->sizep
= &size_scratch
;
1971 *oi
->disk_sizep
= mapsize
;
1972 if ((flags
& OBJECT_INFO_ALLOW_UNKNOWN_TYPE
)) {
1973 if (unpack_sha1_header_to_strbuf(&stream
, map
, mapsize
, hdr
, sizeof(hdr
), &hdrbuf
) < 0)
1974 status
= error("unable to unpack %s header with --allow-unknown-type",
1976 } else if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0)
1977 status
= error("unable to unpack %s header",
1981 else if (hdrbuf
.len
) {
1982 if ((status
= parse_sha1_header_extended(hdrbuf
.buf
, oi
, flags
)) < 0)
1983 status
= error("unable to parse %s header with --allow-unknown-type",
1985 } else if ((status
= parse_sha1_header_extended(hdr
, oi
, flags
)) < 0)
1986 status
= error("unable to parse %s header", sha1_to_hex(sha1
));
1988 if (status
>= 0 && oi
->contentp
)
1989 *oi
->contentp
= unpack_sha1_rest(&stream
, hdr
,
1992 git_inflate_end(&stream
);
1994 munmap(map
, mapsize
);
1995 if (status
&& oi
->typep
)
1996 *oi
->typep
= status
;
1997 if (oi
->sizep
== &size_scratch
)
1999 strbuf_release(&hdrbuf
);
2000 oi
->whence
= OI_LOOSE
;
2001 return (status
< 0) ? status
: 0;
2004 int sha1_object_info_extended(const unsigned char *sha1
, struct object_info
*oi
, unsigned flags
)
2006 static struct object_info blank_oi
= OBJECT_INFO_INIT
;
2007 struct pack_entry e
;
2009 const unsigned char *real
= (flags
& OBJECT_INFO_LOOKUP_REPLACE
) ?
2010 lookup_replace_object(sha1
) :
2016 if (!(flags
& OBJECT_INFO_SKIP_CACHED
)) {
2017 struct cached_object
*co
= find_cached_object(real
);
2020 *(oi
->typep
) = co
->type
;
2022 *(oi
->sizep
) = co
->size
;
2024 *(oi
->disk_sizep
) = 0;
2025 if (oi
->delta_base_sha1
)
2026 hashclr(oi
->delta_base_sha1
);
2028 strbuf_addstr(oi
->typename
, typename(co
->type
));
2030 *oi
->contentp
= xmemdupz(co
->buf
, co
->size
);
2031 oi
->whence
= OI_CACHED
;
2036 if (!find_pack_entry(real
, &e
)) {
2037 /* Most likely it's a loose object. */
2038 if (!sha1_loose_object_info(real
, oi
, flags
))
2041 /* Not a loose object; someone else may have just packed it. */
2042 if (flags
& OBJECT_INFO_QUICK
) {
2045 reprepare_packed_git();
2046 if (!find_pack_entry(real
, &e
))
2051 if (oi
== &blank_oi
)
2053 * We know that the caller doesn't actually need the
2054 * information below, so return early.
2058 rtype
= packed_object_info(e
.p
, e
.offset
, oi
);
2060 mark_bad_packed_object(e
.p
, real
);
2061 return sha1_object_info_extended(real
, oi
, 0);
2062 } else if (oi
->whence
== OI_PACKED
) {
2063 oi
->u
.packed
.offset
= e
.offset
;
2064 oi
->u
.packed
.pack
= e
.p
;
2065 oi
->u
.packed
.is_delta
= (rtype
== OBJ_REF_DELTA
||
2066 rtype
== OBJ_OFS_DELTA
);
2072 /* returns enum object_type or negative */
2073 int sha1_object_info(const unsigned char *sha1
, unsigned long *sizep
)
2075 enum object_type type
;
2076 struct object_info oi
= OBJECT_INFO_INIT
;
2080 if (sha1_object_info_extended(sha1
, &oi
,
2081 OBJECT_INFO_LOOKUP_REPLACE
) < 0)
2086 int pretend_sha1_file(void *buf
, unsigned long len
, enum object_type type
,
2087 unsigned char *sha1
)
2089 struct cached_object
*co
;
2091 hash_sha1_file(buf
, len
, typename(type
), sha1
);
2092 if (has_sha1_file(sha1
) || find_cached_object(sha1
))
2094 ALLOC_GROW(cached_objects
, cached_object_nr
+ 1, cached_object_alloc
);
2095 co
= &cached_objects
[cached_object_nr
++];
2098 co
->buf
= xmalloc(len
);
2099 memcpy(co
->buf
, buf
, len
);
2100 hashcpy(co
->sha1
, sha1
);
2104 static void *read_object(const unsigned char *sha1
, enum object_type
*type
,
2105 unsigned long *size
)
2107 struct object_info oi
= OBJECT_INFO_INIT
;
2111 oi
.contentp
= &content
;
2113 if (sha1_object_info_extended(sha1
, &oi
, 0) < 0)
2119 * This function dies on corrupt objects; the callers who want to
2120 * deal with them should arrange to call read_object() and give error
2121 * messages themselves.
2123 void *read_sha1_file_extended(const unsigned char *sha1
,
2124 enum object_type
*type
,
2125 unsigned long *size
,
2129 const struct packed_git
*p
;
2132 const unsigned char *repl
= lookup_replace
? lookup_replace_object(sha1
)
2136 data
= read_object(repl
, type
, size
);
2140 if (errno
&& errno
!= ENOENT
)
2141 die_errno("failed to read object %s", sha1_to_hex(sha1
));
2143 /* die if we replaced an object with one that does not exist */
2145 die("replacement %s not found for %s",
2146 sha1_to_hex(repl
), sha1_to_hex(sha1
));
2148 if (!stat_sha1_file(repl
, &st
, &path
))
2149 die("loose object %s (stored in %s) is corrupt",
2150 sha1_to_hex(repl
), path
);
2152 if ((p
= has_packed_and_bad(repl
)) != NULL
)
2153 die("packed object %s (stored in %s) is corrupt",
2154 sha1_to_hex(repl
), p
->pack_name
);
2159 void *read_object_with_reference(const unsigned char *sha1
,
2160 const char *required_type_name
,
2161 unsigned long *size
,
2162 unsigned char *actual_sha1_return
)
2164 enum object_type type
, required_type
;
2166 unsigned long isize
;
2167 unsigned char actual_sha1
[20];
2169 required_type
= type_from_string(required_type_name
);
2170 hashcpy(actual_sha1
, sha1
);
2172 int ref_length
= -1;
2173 const char *ref_type
= NULL
;
2175 buffer
= read_sha1_file(actual_sha1
, &type
, &isize
);
2178 if (type
== required_type
) {
2180 if (actual_sha1_return
)
2181 hashcpy(actual_sha1_return
, actual_sha1
);
2184 /* Handle references */
2185 else if (type
== OBJ_COMMIT
)
2187 else if (type
== OBJ_TAG
)
2188 ref_type
= "object ";
2193 ref_length
= strlen(ref_type
);
2195 if (ref_length
+ 40 > isize
||
2196 memcmp(buffer
, ref_type
, ref_length
) ||
2197 get_sha1_hex((char *) buffer
+ ref_length
, actual_sha1
)) {
2202 /* Now we have the ID of the referred-to object in
2203 * actual_sha1. Check again. */
2207 static void write_sha1_file_prepare(const void *buf
, unsigned long len
,
2208 const char *type
, unsigned char *sha1
,
2209 char *hdr
, int *hdrlen
)
2213 /* Generate the header */
2214 *hdrlen
= xsnprintf(hdr
, *hdrlen
, "%s %lu", type
, len
)+1;
2218 git_SHA1_Update(&c
, hdr
, *hdrlen
);
2219 git_SHA1_Update(&c
, buf
, len
);
2220 git_SHA1_Final(sha1
, &c
);
2224 * Move the just written object into its final resting place.
2226 int finalize_object_file(const char *tmpfile
, const char *filename
)
2230 if (object_creation_mode
== OBJECT_CREATION_USES_RENAMES
)
2232 else if (link(tmpfile
, filename
))
2236 * Coda hack - coda doesn't like cross-directory links,
2237 * so we fall back to a rename, which will mean that it
2238 * won't be able to check collisions, but that's not a
2241 * The same holds for FAT formatted media.
2243 * When this succeeds, we just return. We have nothing
2246 if (ret
&& ret
!= EEXIST
) {
2248 if (!rename(tmpfile
, filename
))
2252 unlink_or_warn(tmpfile
);
2254 if (ret
!= EEXIST
) {
2255 return error_errno("unable to write sha1 filename %s", filename
);
2257 /* FIXME!!! Collision check here ? */
2261 if (adjust_shared_perm(filename
))
2262 return error("unable to set permission to '%s'", filename
);
2266 static int write_buffer(int fd
, const void *buf
, size_t len
)
2268 if (write_in_full(fd
, buf
, len
) < 0)
2269 return error_errno("file write error");
2273 int hash_sha1_file(const void *buf
, unsigned long len
, const char *type
,
2274 unsigned char *sha1
)
2277 int hdrlen
= sizeof(hdr
);
2278 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
2282 /* Finalize a file on disk, and close it. */
2283 static void close_sha1_file(int fd
)
2285 if (fsync_object_files
)
2286 fsync_or_die(fd
, "sha1 file");
2288 die_errno("error when closing sha1 file");
2291 /* Size of directory component, including the ending '/' */
2292 static inline int directory_size(const char *filename
)
2294 const char *s
= strrchr(filename
, '/');
2297 return s
- filename
+ 1;
2301 * This creates a temporary file in the same directory as the final
2304 * We want to avoid cross-directory filename renames, because those
2305 * can have problems on various filesystems (FAT, NFS, Coda).
2307 static int create_tmpfile(struct strbuf
*tmp
, const char *filename
)
2309 int fd
, dirlen
= directory_size(filename
);
2312 strbuf_add(tmp
, filename
, dirlen
);
2313 strbuf_addstr(tmp
, "tmp_obj_XXXXXX");
2314 fd
= git_mkstemp_mode(tmp
->buf
, 0444);
2315 if (fd
< 0 && dirlen
&& errno
== ENOENT
) {
2317 * Make sure the directory exists; note that the contents
2318 * of the buffer are undefined after mkstemp returns an
2319 * error, so we have to rewrite the whole buffer from
2323 strbuf_add(tmp
, filename
, dirlen
- 1);
2324 if (mkdir(tmp
->buf
, 0777) && errno
!= EEXIST
)
2326 if (adjust_shared_perm(tmp
->buf
))
2330 strbuf_addstr(tmp
, "/tmp_obj_XXXXXX");
2331 fd
= git_mkstemp_mode(tmp
->buf
, 0444);
2336 static int write_loose_object(const unsigned char *sha1
, char *hdr
, int hdrlen
,
2337 const void *buf
, unsigned long len
, time_t mtime
)
2340 unsigned char compressed
[4096];
2343 unsigned char parano_sha1
[20];
2344 static struct strbuf tmp_file
= STRBUF_INIT
;
2345 const char *filename
= sha1_file_name(sha1
);
2347 fd
= create_tmpfile(&tmp_file
, filename
);
2349 if (errno
== EACCES
)
2350 return error("insufficient permission for adding an object to repository database %s", get_object_directory());
2352 return error_errno("unable to create temporary file");
2356 git_deflate_init(&stream
, zlib_compression_level
);
2357 stream
.next_out
= compressed
;
2358 stream
.avail_out
= sizeof(compressed
);
2361 /* First header.. */
2362 stream
.next_in
= (unsigned char *)hdr
;
2363 stream
.avail_in
= hdrlen
;
2364 while (git_deflate(&stream
, 0) == Z_OK
)
2366 git_SHA1_Update(&c
, hdr
, hdrlen
);
2368 /* Then the data itself.. */
2369 stream
.next_in
= (void *)buf
;
2370 stream
.avail_in
= len
;
2372 unsigned char *in0
= stream
.next_in
;
2373 ret
= git_deflate(&stream
, Z_FINISH
);
2374 git_SHA1_Update(&c
, in0
, stream
.next_in
- in0
);
2375 if (write_buffer(fd
, compressed
, stream
.next_out
- compressed
) < 0)
2376 die("unable to write sha1 file");
2377 stream
.next_out
= compressed
;
2378 stream
.avail_out
= sizeof(compressed
);
2379 } while (ret
== Z_OK
);
2381 if (ret
!= Z_STREAM_END
)
2382 die("unable to deflate new object %s (%d)", sha1_to_hex(sha1
), ret
);
2383 ret
= git_deflate_end_gently(&stream
);
2385 die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1
), ret
);
2386 git_SHA1_Final(parano_sha1
, &c
);
2387 if (hashcmp(sha1
, parano_sha1
) != 0)
2388 die("confused by unstable object source data for %s", sha1_to_hex(sha1
));
2390 close_sha1_file(fd
);
2395 utb
.modtime
= mtime
;
2396 if (utime(tmp_file
.buf
, &utb
) < 0)
2397 warning_errno("failed utime() on %s", tmp_file
.buf
);
2400 return finalize_object_file(tmp_file
.buf
, filename
);
2403 static int freshen_loose_object(const unsigned char *sha1
)
2405 return check_and_freshen(sha1
, 1);
2408 static int freshen_packed_object(const unsigned char *sha1
)
2410 struct pack_entry e
;
2411 if (!find_pack_entry(sha1
, &e
))
2415 if (!freshen_file(e
.p
->pack_name
))
2421 int write_sha1_file(const void *buf
, unsigned long len
, const char *type
, unsigned char *sha1
)
2424 int hdrlen
= sizeof(hdr
);
2426 /* Normally if we have it in the pack then we do not bother writing
2427 * it out into .git/objects/??/?{38} file.
2429 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
2430 if (freshen_packed_object(sha1
) || freshen_loose_object(sha1
))
2432 return write_loose_object(sha1
, hdr
, hdrlen
, buf
, len
, 0);
2435 int hash_sha1_file_literally(const void *buf
, unsigned long len
, const char *type
,
2436 unsigned char *sha1
, unsigned flags
)
2439 int hdrlen
, status
= 0;
2441 /* type string, SP, %lu of the length plus NUL must fit this */
2442 hdrlen
= strlen(type
) + 32;
2443 header
= xmalloc(hdrlen
);
2444 write_sha1_file_prepare(buf
, len
, type
, sha1
, header
, &hdrlen
);
2446 if (!(flags
& HASH_WRITE_OBJECT
))
2448 if (freshen_packed_object(sha1
) || freshen_loose_object(sha1
))
2450 status
= write_loose_object(sha1
, header
, hdrlen
, buf
, len
, 0);
2457 int force_object_loose(const unsigned char *sha1
, time_t mtime
)
2461 enum object_type type
;
2466 if (has_loose_object(sha1
))
2468 buf
= read_object(sha1
, &type
, &len
);
2470 return error("cannot read sha1_file for %s", sha1_to_hex(sha1
));
2471 hdrlen
= xsnprintf(hdr
, sizeof(hdr
), "%s %lu", typename(type
), len
) + 1;
2472 ret
= write_loose_object(sha1
, hdr
, hdrlen
, buf
, len
, mtime
);
2478 int has_pack_index(const unsigned char *sha1
)
2481 if (stat(sha1_pack_index_name(sha1
), &st
))
2486 int has_sha1_pack(const unsigned char *sha1
)
2488 struct pack_entry e
;
2489 return find_pack_entry(sha1
, &e
);
2492 int has_sha1_file_with_flags(const unsigned char *sha1
, int flags
)
2494 if (!startup_info
->have_repository
)
2496 return sha1_object_info_extended(sha1
, NULL
,
2497 flags
| OBJECT_INFO_SKIP_CACHED
) >= 0;
2500 int has_object_file(const struct object_id
*oid
)
2502 return has_sha1_file(oid
->hash
);
2505 int has_object_file_with_flags(const struct object_id
*oid
, int flags
)
2507 return has_sha1_file_with_flags(oid
->hash
, flags
);
2510 static void check_tree(const void *buf
, size_t size
)
2512 struct tree_desc desc
;
2513 struct name_entry entry
;
2515 init_tree_desc(&desc
, buf
, size
);
2516 while (tree_entry(&desc
, &entry
))
2518 * tree_entry() will die() on malformed entries */
2522 static void check_commit(const void *buf
, size_t size
)
2525 memset(&c
, 0, sizeof(c
));
2526 if (parse_commit_buffer(&c
, buf
, size
))
2527 die("corrupt commit");
2530 static void check_tag(const void *buf
, size_t size
)
2533 memset(&t
, 0, sizeof(t
));
2534 if (parse_tag_buffer(&t
, buf
, size
))
2538 static int index_mem(unsigned char *sha1
, void *buf
, size_t size
,
2539 enum object_type type
,
2540 const char *path
, unsigned flags
)
2542 int ret
, re_allocated
= 0;
2543 int write_object
= flags
& HASH_WRITE_OBJECT
;
2549 * Convert blobs to git internal format
2551 if ((type
== OBJ_BLOB
) && path
) {
2552 struct strbuf nbuf
= STRBUF_INIT
;
2553 if (convert_to_git(&the_index
, path
, buf
, size
, &nbuf
,
2554 write_object
? safe_crlf
: SAFE_CRLF_FALSE
)) {
2555 buf
= strbuf_detach(&nbuf
, &size
);
2559 if (flags
& HASH_FORMAT_CHECK
) {
2560 if (type
== OBJ_TREE
)
2561 check_tree(buf
, size
);
2562 if (type
== OBJ_COMMIT
)
2563 check_commit(buf
, size
);
2564 if (type
== OBJ_TAG
)
2565 check_tag(buf
, size
);
2569 ret
= write_sha1_file(buf
, size
, typename(type
), sha1
);
2571 ret
= hash_sha1_file(buf
, size
, typename(type
), sha1
);
2577 static int index_stream_convert_blob(unsigned char *sha1
, int fd
,
2578 const char *path
, unsigned flags
)
2581 const int write_object
= flags
& HASH_WRITE_OBJECT
;
2582 struct strbuf sbuf
= STRBUF_INIT
;
2585 assert(would_convert_to_git_filter_fd(path
));
2587 convert_to_git_filter_fd(&the_index
, path
, fd
, &sbuf
,
2588 write_object
? safe_crlf
: SAFE_CRLF_FALSE
);
2591 ret
= write_sha1_file(sbuf
.buf
, sbuf
.len
, typename(OBJ_BLOB
),
2594 ret
= hash_sha1_file(sbuf
.buf
, sbuf
.len
, typename(OBJ_BLOB
),
2596 strbuf_release(&sbuf
);
2600 static int index_pipe(unsigned char *sha1
, int fd
, enum object_type type
,
2601 const char *path
, unsigned flags
)
2603 struct strbuf sbuf
= STRBUF_INIT
;
2606 if (strbuf_read(&sbuf
, fd
, 4096) >= 0)
2607 ret
= index_mem(sha1
, sbuf
.buf
, sbuf
.len
, type
, path
, flags
);
2610 strbuf_release(&sbuf
);
2614 #define SMALL_FILE_SIZE (32*1024)
2616 static int index_core(unsigned char *sha1
, int fd
, size_t size
,
2617 enum object_type type
, const char *path
,
2623 ret
= index_mem(sha1
, "", size
, type
, path
, flags
);
2624 } else if (size
<= SMALL_FILE_SIZE
) {
2625 char *buf
= xmalloc(size
);
2626 if (size
== read_in_full(fd
, buf
, size
))
2627 ret
= index_mem(sha1
, buf
, size
, type
, path
, flags
);
2629 ret
= error_errno("short read");
2632 void *buf
= xmmap(NULL
, size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
2633 ret
= index_mem(sha1
, buf
, size
, type
, path
, flags
);
2640 * This creates one packfile per large blob unless bulk-checkin
2641 * machinery is "plugged".
2643 * This also bypasses the usual "convert-to-git" dance, and that is on
2644 * purpose. We could write a streaming version of the converting
2645 * functions and insert that before feeding the data to fast-import
2646 * (or equivalent in-core API described above). However, that is
2647 * somewhat complicated, as we do not know the size of the filter
2648 * result, which we need to know beforehand when writing a git object.
2649 * Since the primary motivation for trying to stream from the working
2650 * tree file and to avoid mmaping it in core is to deal with large
2651 * binary blobs, they generally do not want to get any conversion, and
2652 * callers should avoid this code path when filters are requested.
2654 static int index_stream(unsigned char *sha1
, int fd
, size_t size
,
2655 enum object_type type
, const char *path
,
2658 return index_bulk_checkin(sha1
, fd
, size
, type
, path
, flags
);
2661 int index_fd(unsigned char *sha1
, int fd
, struct stat
*st
,
2662 enum object_type type
, const char *path
, unsigned flags
)
2667 * Call xsize_t() only when needed to avoid potentially unnecessary
2668 * die() for large files.
2670 if (type
== OBJ_BLOB
&& path
&& would_convert_to_git_filter_fd(path
))
2671 ret
= index_stream_convert_blob(sha1
, fd
, path
, flags
);
2672 else if (!S_ISREG(st
->st_mode
))
2673 ret
= index_pipe(sha1
, fd
, type
, path
, flags
);
2674 else if (st
->st_size
<= big_file_threshold
|| type
!= OBJ_BLOB
||
2675 (path
&& would_convert_to_git(&the_index
, path
)))
2676 ret
= index_core(sha1
, fd
, xsize_t(st
->st_size
), type
, path
,
2679 ret
= index_stream(sha1
, fd
, xsize_t(st
->st_size
), type
, path
,
2685 int index_path(unsigned char *sha1
, const char *path
, struct stat
*st
, unsigned flags
)
2688 struct strbuf sb
= STRBUF_INIT
;
2690 switch (st
->st_mode
& S_IFMT
) {
2692 fd
= open(path
, O_RDONLY
);
2694 return error_errno("open(\"%s\")", path
);
2695 if (index_fd(sha1
, fd
, st
, OBJ_BLOB
, path
, flags
) < 0)
2696 return error("%s: failed to insert into database",
2700 if (strbuf_readlink(&sb
, path
, st
->st_size
))
2701 return error_errno("readlink(\"%s\")", path
);
2702 if (!(flags
& HASH_WRITE_OBJECT
))
2703 hash_sha1_file(sb
.buf
, sb
.len
, blob_type
, sha1
);
2704 else if (write_sha1_file(sb
.buf
, sb
.len
, blob_type
, sha1
))
2705 return error("%s: failed to insert into database",
2707 strbuf_release(&sb
);
2710 return resolve_gitlink_ref(path
, "HEAD", sha1
);
2712 return error("%s: unsupported file type", path
);
2717 int read_pack_header(int fd
, struct pack_header
*header
)
2719 if (read_in_full(fd
, header
, sizeof(*header
)) < sizeof(*header
))
2720 /* "eof before pack header was fully read" */
2721 return PH_ERROR_EOF
;
2723 if (header
->hdr_signature
!= htonl(PACK_SIGNATURE
))
2724 /* "protocol error (pack signature mismatch detected)" */
2725 return PH_ERROR_PACK_SIGNATURE
;
2726 if (!pack_version_ok(header
->hdr_version
))
2727 /* "protocol error (pack version unsupported)" */
2728 return PH_ERROR_PROTOCOL
;
2732 void assert_sha1_type(const unsigned char *sha1
, enum object_type expect
)
2734 enum object_type type
= sha1_object_info(sha1
, NULL
);
2736 die("%s is not a valid object", sha1_to_hex(sha1
));
2738 die("%s is not a valid '%s' object", sha1_to_hex(sha1
),
2742 int for_each_file_in_obj_subdir(unsigned int subdir_nr
,
2743 struct strbuf
*path
,
2744 each_loose_object_fn obj_cb
,
2745 each_loose_cruft_fn cruft_cb
,
2746 each_loose_subdir_fn subdir_cb
,
2749 size_t origlen
, baselen
;
2754 if (subdir_nr
> 0xff)
2755 BUG("invalid loose object subdirectory: %x", subdir_nr
);
2757 origlen
= path
->len
;
2758 strbuf_complete(path
, '/');
2759 strbuf_addf(path
, "%02x", subdir_nr
);
2760 baselen
= path
->len
;
2762 dir
= opendir(path
->buf
);
2764 if (errno
!= ENOENT
)
2765 r
= error_errno("unable to open %s", path
->buf
);
2766 strbuf_setlen(path
, origlen
);
2770 while ((de
= readdir(dir
))) {
2771 if (is_dot_or_dotdot(de
->d_name
))
2774 strbuf_setlen(path
, baselen
);
2775 strbuf_addf(path
, "/%s", de
->d_name
);
2777 if (strlen(de
->d_name
) == GIT_SHA1_HEXSZ
- 2) {
2778 char hex
[GIT_MAX_HEXSZ
+1];
2779 struct object_id oid
;
2781 xsnprintf(hex
, sizeof(hex
), "%02x%s",
2782 subdir_nr
, de
->d_name
);
2783 if (!get_oid_hex(hex
, &oid
)) {
2785 r
= obj_cb(&oid
, path
->buf
, data
);
2794 r
= cruft_cb(de
->d_name
, path
->buf
, data
);
2801 strbuf_setlen(path
, baselen
);
2802 if (!r
&& subdir_cb
)
2803 r
= subdir_cb(subdir_nr
, path
->buf
, data
);
2805 strbuf_setlen(path
, origlen
);
2810 int for_each_loose_file_in_objdir_buf(struct strbuf
*path
,
2811 each_loose_object_fn obj_cb
,
2812 each_loose_cruft_fn cruft_cb
,
2813 each_loose_subdir_fn subdir_cb
,
2819 for (i
= 0; i
< 256; i
++) {
2820 r
= for_each_file_in_obj_subdir(i
, path
, obj_cb
, cruft_cb
,
2829 int for_each_loose_file_in_objdir(const char *path
,
2830 each_loose_object_fn obj_cb
,
2831 each_loose_cruft_fn cruft_cb
,
2832 each_loose_subdir_fn subdir_cb
,
2835 struct strbuf buf
= STRBUF_INIT
;
2838 strbuf_addstr(&buf
, path
);
2839 r
= for_each_loose_file_in_objdir_buf(&buf
, obj_cb
, cruft_cb
,
2841 strbuf_release(&buf
);
2846 struct loose_alt_odb_data
{
2847 each_loose_object_fn
*cb
;
2851 static int loose_from_alt_odb(struct alternate_object_database
*alt
,
2854 struct loose_alt_odb_data
*data
= vdata
;
2855 struct strbuf buf
= STRBUF_INIT
;
2858 strbuf_addstr(&buf
, alt
->path
);
2859 r
= for_each_loose_file_in_objdir_buf(&buf
,
2860 data
->cb
, NULL
, NULL
,
2862 strbuf_release(&buf
);
2866 int for_each_loose_object(each_loose_object_fn cb
, void *data
, unsigned flags
)
2868 struct loose_alt_odb_data alt
;
2871 r
= for_each_loose_file_in_objdir(get_object_directory(),
2872 cb
, NULL
, NULL
, data
);
2876 if (flags
& FOR_EACH_OBJECT_LOCAL_ONLY
)
2881 return foreach_alt_odb(loose_from_alt_odb
, &alt
);
2884 static int for_each_object_in_pack(struct packed_git
*p
, each_packed_object_fn cb
, void *data
)
2889 for (i
= 0; i
< p
->num_objects
; i
++) {
2890 struct object_id oid
;
2892 if (!nth_packed_object_oid(&oid
, p
, i
))
2893 return error("unable to get sha1 of object %u in %s",
2896 r
= cb(&oid
, p
, i
, data
);
2903 int for_each_packed_object(each_packed_object_fn cb
, void *data
, unsigned flags
)
2905 struct packed_git
*p
;
2907 int pack_errors
= 0;
2909 prepare_packed_git();
2910 for (p
= packed_git
; p
; p
= p
->next
) {
2911 if ((flags
& FOR_EACH_OBJECT_LOCAL_ONLY
) && !p
->pack_local
)
2913 if (open_pack_index(p
)) {
2917 r
= for_each_object_in_pack(p
, cb
, data
);
2921 return r
? r
: pack_errors
;
2924 static int check_stream_sha1(git_zstream
*stream
,
2928 const unsigned char *expected_sha1
)
2931 unsigned char real_sha1
[GIT_MAX_RAWSZ
];
2932 unsigned char buf
[4096];
2933 unsigned long total_read
;
2937 git_SHA1_Update(&c
, hdr
, stream
->total_out
);
2940 * We already read some bytes into hdr, but the ones up to the NUL
2941 * do not count against the object's content size.
2943 total_read
= stream
->total_out
- strlen(hdr
) - 1;
2946 * This size comparison must be "<=" to read the final zlib packets;
2947 * see the comment in unpack_sha1_rest for details.
2949 while (total_read
<= size
&&
2950 (status
== Z_OK
|| status
== Z_BUF_ERROR
)) {
2951 stream
->next_out
= buf
;
2952 stream
->avail_out
= sizeof(buf
);
2953 if (size
- total_read
< stream
->avail_out
)
2954 stream
->avail_out
= size
- total_read
;
2955 status
= git_inflate(stream
, Z_FINISH
);
2956 git_SHA1_Update(&c
, buf
, stream
->next_out
- buf
);
2957 total_read
+= stream
->next_out
- buf
;
2959 git_inflate_end(stream
);
2961 if (status
!= Z_STREAM_END
) {
2962 error("corrupt loose object '%s'", sha1_to_hex(expected_sha1
));
2965 if (stream
->avail_in
) {
2966 error("garbage at end of loose object '%s'",
2967 sha1_to_hex(expected_sha1
));
2971 git_SHA1_Final(real_sha1
, &c
);
2972 if (hashcmp(expected_sha1
, real_sha1
)) {
2973 error("sha1 mismatch for %s (expected %s)", path
,
2974 sha1_to_hex(expected_sha1
));
2981 int read_loose_object(const char *path
,
2982 const unsigned char *expected_sha1
,
2983 enum object_type
*type
,
2984 unsigned long *size
,
2989 unsigned long mapsize
;
2995 map
= map_sha1_file_1(path
, NULL
, &mapsize
);
2997 error_errno("unable to mmap %s", path
);
3001 if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0) {
3002 error("unable to unpack header of %s", path
);
3006 *type
= parse_sha1_header(hdr
, size
);
3008 error("unable to parse header of %s", path
);
3009 git_inflate_end(&stream
);
3013 if (*type
== OBJ_BLOB
) {
3014 if (check_stream_sha1(&stream
, hdr
, *size
, path
, expected_sha1
) < 0)
3017 *contents
= unpack_sha1_rest(&stream
, hdr
, *size
, expected_sha1
);
3019 error("unable to unpack contents of %s", path
);
3020 git_inflate_end(&stream
);
3023 if (check_sha1_signature(expected_sha1
, *contents
,
3024 *size
, typename(*type
))) {
3025 error("sha1 mismatch for %s (expected %s)", path
,
3026 sha1_to_hex(expected_sha1
));
3032 ret
= 0; /* everything checks out */
3036 munmap(map
, mapsize
);