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 "repository.h"
26 #include "streaming.h"
29 #include "mergesort.h"
32 #include "fetch-object.h"
33 #include "object-store.h"
35 const unsigned char null_sha1
[GIT_MAX_RAWSZ
];
36 const struct object_id null_oid
;
37 const struct object_id empty_tree_oid
= {
38 EMPTY_TREE_SHA1_BIN_LITERAL
40 const struct object_id empty_blob_oid
= {
41 EMPTY_BLOB_SHA1_BIN_LITERAL
44 static void git_hash_sha1_init(void *ctx
)
46 git_SHA1_Init((git_SHA_CTX
*)ctx
);
49 static void git_hash_sha1_update(void *ctx
, const void *data
, size_t len
)
51 git_SHA1_Update((git_SHA_CTX
*)ctx
, data
, len
);
54 static void git_hash_sha1_final(unsigned char *hash
, void *ctx
)
56 git_SHA1_Final(hash
, (git_SHA_CTX
*)ctx
);
59 static void git_hash_unknown_init(void *ctx
)
61 die("trying to init unknown hash");
64 static void git_hash_unknown_update(void *ctx
, const void *data
, size_t len
)
66 die("trying to update unknown hash");
69 static void git_hash_unknown_final(unsigned char *hash
, void *ctx
)
71 die("trying to finalize unknown hash");
74 const struct git_hash_algo hash_algos
[GIT_HASH_NALGOS
] = {
81 git_hash_unknown_init
,
82 git_hash_unknown_update
,
83 git_hash_unknown_final
,
89 /* "sha1", big-endian */
103 * This is meant to hold a *small* number of objects that you would
104 * want read_sha1_file() to be able to return, but yet you do not want
105 * to write them into the object store (e.g. a browse-only
108 static struct cached_object
{
109 unsigned char sha1
[20];
110 enum object_type type
;
114 static int cached_object_nr
, cached_object_alloc
;
116 static struct cached_object empty_tree
= {
117 EMPTY_TREE_SHA1_BIN_LITERAL
,
123 static struct cached_object
*find_cached_object(const unsigned char *sha1
)
126 struct cached_object
*co
= cached_objects
;
128 for (i
= 0; i
< cached_object_nr
; i
++, co
++) {
129 if (!hashcmp(co
->sha1
, sha1
))
132 if (!hashcmp(sha1
, empty_tree
.sha1
))
138 static int get_conv_flags(unsigned flags
)
140 if (flags
& HASH_RENORMALIZE
)
141 return CONV_EOL_RENORMALIZE
;
142 else if (flags
& HASH_WRITE_OBJECT
)
143 return global_conv_flags_eol
;
149 int mkdir_in_gitdir(const char *path
)
151 if (mkdir(path
, 0777)) {
152 int saved_errno
= errno
;
154 struct strbuf sb
= STRBUF_INIT
;
159 * Are we looking at a path in a symlinked worktree
160 * whose original repository does not yet have it?
161 * e.g. .git/rr-cache pointing at its original
162 * repository in which the user hasn't performed any
163 * conflict resolution yet?
165 if (lstat(path
, &st
) || !S_ISLNK(st
.st_mode
) ||
166 strbuf_readlink(&sb
, path
, st
.st_size
) ||
167 !is_absolute_path(sb
.buf
) ||
168 mkdir(sb
.buf
, 0777)) {
175 return adjust_shared_perm(path
);
178 enum scld_error
safe_create_leading_directories(char *path
)
180 char *next_component
= path
+ offset_1st_component(path
);
181 enum scld_error ret
= SCLD_OK
;
183 while (ret
== SCLD_OK
&& next_component
) {
185 char *slash
= next_component
, slash_character
;
187 while (*slash
&& !is_dir_sep(*slash
))
193 next_component
= slash
+ 1;
194 while (is_dir_sep(*next_component
))
196 if (!*next_component
)
199 slash_character
= *slash
;
201 if (!stat(path
, &st
)) {
203 if (!S_ISDIR(st
.st_mode
)) {
207 } else if (mkdir(path
, 0777)) {
208 if (errno
== EEXIST
&&
209 !stat(path
, &st
) && S_ISDIR(st
.st_mode
))
210 ; /* somebody created it since we checked */
211 else if (errno
== ENOENT
)
213 * Either mkdir() failed because
214 * somebody just pruned the containing
215 * directory, or stat() failed because
216 * the file that was in our way was
217 * just removed. Either way, inform
218 * the caller that it might be worth
224 } else if (adjust_shared_perm(path
)) {
227 *slash
= slash_character
;
232 enum scld_error
safe_create_leading_directories_const(const char *path
)
235 /* path points to cache entries, so xstrdup before messing with it */
236 char *buf
= xstrdup(path
);
237 enum scld_error result
= safe_create_leading_directories(buf
);
245 int raceproof_create_file(const char *path
, create_file_fn fn
, void *cb
)
248 * The number of times we will try to remove empty directories
249 * in the way of path. This is only 1 because if another
250 * process is racily creating directories that conflict with
251 * us, we don't want to fight against them.
253 int remove_directories_remaining
= 1;
256 * The number of times that we will try to create the
257 * directories containing path. We are willing to attempt this
258 * more than once, because another process could be trying to
259 * clean up empty directories at the same time as we are
260 * trying to create them.
262 int create_directories_remaining
= 3;
264 /* A scratch copy of path, filled lazily if we need it: */
265 struct strbuf path_copy
= STRBUF_INIT
;
278 if (errno
== EISDIR
&& remove_directories_remaining
-- > 0) {
280 * A directory is in the way. Maybe it is empty; try
284 strbuf_addstr(&path_copy
, path
);
286 if (!remove_dir_recursively(&path_copy
, REMOVE_DIR_EMPTY_ONLY
))
288 } else if (errno
== ENOENT
&& create_directories_remaining
-- > 0) {
290 * Maybe the containing directory didn't exist, or
291 * maybe it was just deleted by a process that is
292 * racing with us to clean up empty directories. Try
295 enum scld_error scld_result
;
298 strbuf_addstr(&path_copy
, path
);
301 scld_result
= safe_create_leading_directories(path_copy
.buf
);
302 if (scld_result
== SCLD_OK
)
304 } while (scld_result
== SCLD_VANISHED
&& create_directories_remaining
-- > 0);
308 strbuf_release(&path_copy
);
313 static void fill_sha1_path(struct strbuf
*buf
, const unsigned char *sha1
)
316 for (i
= 0; i
< 20; i
++) {
317 static char hex
[] = "0123456789abcdef";
318 unsigned int val
= sha1
[i
];
319 strbuf_addch(buf
, hex
[val
>> 4]);
320 strbuf_addch(buf
, hex
[val
& 0xf]);
322 strbuf_addch(buf
, '/');
326 void sha1_file_name(struct strbuf
*buf
, const unsigned char *sha1
)
328 strbuf_addstr(buf
, get_object_directory());
329 strbuf_addch(buf
, '/');
330 fill_sha1_path(buf
, sha1
);
333 struct strbuf
*alt_scratch_buf(struct alternate_object_database
*alt
)
335 strbuf_setlen(&alt
->scratch
, alt
->base_len
);
336 return &alt
->scratch
;
339 static const char *alt_sha1_path(struct alternate_object_database
*alt
,
340 const unsigned char *sha1
)
342 struct strbuf
*buf
= alt_scratch_buf(alt
);
343 fill_sha1_path(buf
, sha1
);
348 * Return non-zero iff the path is usable as an alternate object database.
350 static int alt_odb_usable(struct raw_object_store
*o
,
352 const char *normalized_objdir
)
354 struct alternate_object_database
*alt
;
356 /* Detect cases where alternate disappeared */
357 if (!is_directory(path
->buf
)) {
358 error("object directory %s does not exist; "
359 "check .git/objects/info/alternates.",
365 * Prevent the common mistake of listing the same
366 * thing twice, or object directory itself.
368 for (alt
= o
->alt_odb_list
; alt
; alt
= alt
->next
) {
369 if (!fspathcmp(path
->buf
, alt
->path
))
372 if (!fspathcmp(path
->buf
, normalized_objdir
))
379 * Prepare alternate object database registry.
381 * The variable alt_odb_list points at the list of struct
382 * alternate_object_database. The elements on this list come from
383 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
384 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
385 * whose contents is similar to that environment variable but can be
386 * LF separated. Its base points at a statically allocated buffer that
387 * contains "/the/directory/corresponding/to/.git/objects/...", while
388 * its name points just after the slash at the end of ".git/objects/"
389 * in the example above, and has enough space to hold 40-byte hex
390 * SHA1, an extra slash for the first level indirection, and the
393 static void read_info_alternates(struct repository
*r
,
394 const char *relative_base
,
396 static int link_alt_odb_entry(struct repository
*r
, const char *entry
,
397 const char *relative_base
, int depth
, const char *normalized_objdir
)
399 struct alternate_object_database
*ent
;
400 struct strbuf pathbuf
= STRBUF_INIT
;
402 if (!is_absolute_path(entry
) && relative_base
) {
403 strbuf_realpath(&pathbuf
, relative_base
, 1);
404 strbuf_addch(&pathbuf
, '/');
406 strbuf_addstr(&pathbuf
, entry
);
408 if (strbuf_normalize_path(&pathbuf
) < 0 && relative_base
) {
409 error("unable to normalize alternate object path: %s",
411 strbuf_release(&pathbuf
);
416 * The trailing slash after the directory name is given by
417 * this function at the end. Remove duplicates.
419 while (pathbuf
.len
&& pathbuf
.buf
[pathbuf
.len
- 1] == '/')
420 strbuf_setlen(&pathbuf
, pathbuf
.len
- 1);
422 if (!alt_odb_usable(r
->objects
, &pathbuf
, normalized_objdir
)) {
423 strbuf_release(&pathbuf
);
427 ent
= alloc_alt_odb(pathbuf
.buf
);
429 /* add the alternate entry */
430 *r
->objects
->alt_odb_tail
= ent
;
431 r
->objects
->alt_odb_tail
= &(ent
->next
);
434 /* recursively add alternates */
435 read_info_alternates(r
, pathbuf
.buf
, depth
+ 1);
437 strbuf_release(&pathbuf
);
441 static const char *parse_alt_odb_entry(const char *string
,
449 if (*string
== '#') {
450 /* comment; consume up to next separator */
451 end
= strchrnul(string
, sep
);
452 } else if (*string
== '"' && !unquote_c_style(out
, string
, &end
)) {
454 * quoted path; unquote_c_style has copied the
455 * data for us and set "end". Broken quoting (e.g.,
456 * an entry that doesn't end with a quote) falls
457 * back to the unquoted case below.
460 /* normal, unquoted path */
461 end
= strchrnul(string
, sep
);
462 strbuf_add(out
, string
, end
- string
);
470 static void link_alt_odb_entries(struct repository
*r
, const char *alt
,
471 int sep
, const char *relative_base
, int depth
)
473 struct strbuf objdirbuf
= STRBUF_INIT
;
474 struct strbuf entry
= STRBUF_INIT
;
480 error("%s: ignoring alternate object stores, nesting too deep.",
485 strbuf_add_absolute_path(&objdirbuf
, r
->objects
->objectdir
);
486 if (strbuf_normalize_path(&objdirbuf
) < 0)
487 die("unable to normalize object directory: %s",
491 alt
= parse_alt_odb_entry(alt
, sep
, &entry
);
494 link_alt_odb_entry(r
, entry
.buf
,
495 relative_base
, depth
, objdirbuf
.buf
);
497 strbuf_release(&entry
);
498 strbuf_release(&objdirbuf
);
501 static void read_info_alternates(struct repository
*r
,
502 const char *relative_base
,
506 struct strbuf buf
= STRBUF_INIT
;
508 path
= xstrfmt("%s/info/alternates", relative_base
);
509 if (strbuf_read_file(&buf
, path
, 1024) < 0) {
510 warn_on_fopen_errors(path
);
515 link_alt_odb_entries(r
, buf
.buf
, '\n', relative_base
, depth
);
516 strbuf_release(&buf
);
520 struct alternate_object_database
*alloc_alt_odb(const char *dir
)
522 struct alternate_object_database
*ent
;
524 FLEX_ALLOC_STR(ent
, path
, dir
);
525 strbuf_init(&ent
->scratch
, 0);
526 strbuf_addf(&ent
->scratch
, "%s/", dir
);
527 ent
->base_len
= ent
->scratch
.len
;
532 void add_to_alternates_file(const char *reference
)
534 struct lock_file lock
= LOCK_INIT
;
535 char *alts
= git_pathdup("objects/info/alternates");
539 hold_lock_file_for_update(&lock
, alts
, LOCK_DIE_ON_ERROR
);
540 out
= fdopen_lock_file(&lock
, "w");
542 die_errno("unable to fdopen alternates lockfile");
544 in
= fopen(alts
, "r");
546 struct strbuf line
= STRBUF_INIT
;
548 while (strbuf_getline(&line
, in
) != EOF
) {
549 if (!strcmp(reference
, line
.buf
)) {
553 fprintf_or_die(out
, "%s\n", line
.buf
);
556 strbuf_release(&line
);
559 else if (errno
!= ENOENT
)
560 die_errno("unable to read alternates file");
563 rollback_lock_file(&lock
);
565 fprintf_or_die(out
, "%s\n", reference
);
566 if (commit_lock_file(&lock
))
567 die_errno("unable to move new alternates file into place");
568 if (the_repository
->objects
->alt_odb_tail
)
569 link_alt_odb_entries(the_repository
, reference
,
575 void add_to_alternates_memory(const char *reference
)
578 * Make sure alternates are initialized, or else our entry may be
579 * overwritten when they are.
581 prepare_alt_odb(the_repository
);
583 link_alt_odb_entries(the_repository
, reference
,
588 * Compute the exact path an alternate is at and returns it. In case of
589 * error NULL is returned and the human readable error is added to `err`
590 * `path` may be relative and should point to $GITDIR.
591 * `err` must not be null.
593 char *compute_alternate_path(const char *path
, struct strbuf
*err
)
595 char *ref_git
= NULL
;
596 const char *repo
, *ref_git_s
;
599 ref_git_s
= real_path_if_valid(path
);
602 strbuf_addf(err
, _("path '%s' does not exist"), path
);
606 * Beware: read_gitfile(), real_path() and mkpath()
607 * return static buffer
609 ref_git
= xstrdup(ref_git_s
);
611 repo
= read_gitfile(ref_git
);
613 repo
= read_gitfile(mkpath("%s/.git", ref_git
));
616 ref_git
= xstrdup(repo
);
619 if (!repo
&& is_directory(mkpath("%s/.git/objects", ref_git
))) {
620 char *ref_git_git
= mkpathdup("%s/.git", ref_git
);
622 ref_git
= ref_git_git
;
623 } else if (!is_directory(mkpath("%s/objects", ref_git
))) {
624 struct strbuf sb
= STRBUF_INIT
;
626 if (get_common_dir(&sb
, ref_git
)) {
628 _("reference repository '%s' as a linked "
629 "checkout is not supported yet."),
634 strbuf_addf(err
, _("reference repository '%s' is not a "
635 "local repository."), path
);
639 if (!access(mkpath("%s/shallow", ref_git
), F_OK
)) {
640 strbuf_addf(err
, _("reference repository '%s' is shallow"),
646 if (!access(mkpath("%s/info/grafts", ref_git
), F_OK
)) {
648 _("reference repository '%s' is grafted"),
656 FREE_AND_NULL(ref_git
);
662 int foreach_alt_odb(alt_odb_fn fn
, void *cb
)
664 struct alternate_object_database
*ent
;
667 prepare_alt_odb(the_repository
);
668 for (ent
= the_repository
->objects
->alt_odb_list
; ent
; ent
= ent
->next
) {
676 void prepare_alt_odb(struct repository
*r
)
678 if (r
->objects
->alt_odb_tail
)
681 r
->objects
->alt_odb_tail
= &r
->objects
->alt_odb_list
;
682 link_alt_odb_entries(r
, r
->objects
->alternate_db
, PATH_SEP
, NULL
, 0);
684 read_info_alternates(r
, r
->objects
->objectdir
, 0);
687 /* Returns 1 if we have successfully freshened the file, 0 otherwise. */
688 static int freshen_file(const char *fn
)
691 t
.actime
= t
.modtime
= time(NULL
);
692 return !utime(fn
, &t
);
696 * All of the check_and_freshen functions return 1 if the file exists and was
697 * freshened (if freshening was requested), 0 otherwise. If they return
698 * 0, you should not assume that it is safe to skip a write of the object (it
699 * either does not exist on disk, or has a stale mtime and may be subject to
702 int check_and_freshen_file(const char *fn
, int freshen
)
704 if (access(fn
, F_OK
))
706 if (freshen
&& !freshen_file(fn
))
711 static int check_and_freshen_local(const unsigned char *sha1
, int freshen
)
713 static struct strbuf buf
= STRBUF_INIT
;
716 sha1_file_name(&buf
, sha1
);
718 return check_and_freshen_file(buf
.buf
, freshen
);
721 static int check_and_freshen_nonlocal(const unsigned char *sha1
, int freshen
)
723 struct alternate_object_database
*alt
;
724 prepare_alt_odb(the_repository
);
725 for (alt
= the_repository
->objects
->alt_odb_list
; alt
; alt
= alt
->next
) {
726 const char *path
= alt_sha1_path(alt
, sha1
);
727 if (check_and_freshen_file(path
, freshen
))
733 static int check_and_freshen(const unsigned char *sha1
, int freshen
)
735 return check_and_freshen_local(sha1
, freshen
) ||
736 check_and_freshen_nonlocal(sha1
, freshen
);
739 int has_loose_object_nonlocal(const unsigned char *sha1
)
741 return check_and_freshen_nonlocal(sha1
, 0);
744 static int has_loose_object(const unsigned char *sha1
)
746 return check_and_freshen(sha1
, 0);
749 static void mmap_limit_check(size_t length
)
751 static size_t limit
= 0;
753 limit
= git_env_ulong("GIT_MMAP_LIMIT", 0);
758 die("attempting to mmap %"PRIuMAX
" over limit %"PRIuMAX
,
759 (uintmax_t)length
, (uintmax_t)limit
);
762 void *xmmap_gently(void *start
, size_t length
,
763 int prot
, int flags
, int fd
, off_t offset
)
767 mmap_limit_check(length
);
768 ret
= mmap(start
, length
, prot
, flags
, fd
, offset
);
769 if (ret
== MAP_FAILED
) {
772 release_pack_memory(length
);
773 ret
= mmap(start
, length
, prot
, flags
, fd
, offset
);
778 void *xmmap(void *start
, size_t length
,
779 int prot
, int flags
, int fd
, off_t offset
)
781 void *ret
= xmmap_gently(start
, length
, prot
, flags
, fd
, offset
);
782 if (ret
== MAP_FAILED
)
783 die_errno("mmap failed");
788 * With an in-core object data in "map", rehash it to make sure the
789 * object name actually matches "sha1" to detect object corruption.
790 * With "map" == NULL, try reading the object named with "sha1" using
791 * the streaming interface and rehash it to do the same.
793 int check_sha1_signature(const unsigned char *sha1
, void *map
,
794 unsigned long size
, const char *type
)
796 unsigned char real_sha1
[20];
797 enum object_type obj_type
;
798 struct git_istream
*st
;
804 hash_sha1_file(map
, size
, type
, real_sha1
);
805 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
808 st
= open_istream(sha1
, &obj_type
, &size
, NULL
);
812 /* Generate the header */
813 hdrlen
= xsnprintf(hdr
, sizeof(hdr
), "%s %lu", typename(obj_type
), size
) + 1;
817 git_SHA1_Update(&c
, hdr
, hdrlen
);
820 ssize_t readlen
= read_istream(st
, buf
, sizeof(buf
));
828 git_SHA1_Update(&c
, buf
, readlen
);
830 git_SHA1_Final(real_sha1
, &c
);
832 return hashcmp(sha1
, real_sha1
) ? -1 : 0;
835 int git_open_cloexec(const char *name
, int flags
)
838 static int o_cloexec
= O_CLOEXEC
;
840 fd
= open(name
, flags
| o_cloexec
);
841 if ((o_cloexec
& O_CLOEXEC
) && fd
< 0 && errno
== EINVAL
) {
842 /* Try again w/o O_CLOEXEC: the kernel might not support it */
843 o_cloexec
&= ~O_CLOEXEC
;
844 fd
= open(name
, flags
| o_cloexec
);
847 #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
849 static int fd_cloexec
= FD_CLOEXEC
;
851 if (!o_cloexec
&& 0 <= fd
&& fd_cloexec
) {
852 /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
853 int flags
= fcntl(fd
, F_GETFD
);
854 if (fcntl(fd
, F_SETFD
, flags
| fd_cloexec
))
863 * Find "sha1" as a loose object in the local repository or in an alternate.
864 * Returns 0 on success, negative on failure.
866 * The "path" out-parameter will give the path of the object we found (if any).
867 * Note that it may point to static storage and is only valid until another
868 * call to sha1_file_name(), etc.
870 static int stat_sha1_file(const unsigned char *sha1
, struct stat
*st
,
873 struct alternate_object_database
*alt
;
874 static struct strbuf buf
= STRBUF_INIT
;
877 sha1_file_name(&buf
, sha1
);
880 if (!lstat(*path
, st
))
883 prepare_alt_odb(the_repository
);
885 for (alt
= the_repository
->objects
->alt_odb_list
; alt
; alt
= alt
->next
) {
886 *path
= alt_sha1_path(alt
, sha1
);
887 if (!lstat(*path
, st
))
895 * Like stat_sha1_file(), but actually open the object and return the
896 * descriptor. See the caveats on the "path" parameter above.
898 static int open_sha1_file(const unsigned char *sha1
, const char **path
)
901 struct alternate_object_database
*alt
;
902 int most_interesting_errno
;
903 static struct strbuf buf
= STRBUF_INIT
;
906 sha1_file_name(&buf
, sha1
);
909 fd
= git_open(*path
);
912 most_interesting_errno
= errno
;
914 prepare_alt_odb(the_repository
);
915 for (alt
= the_repository
->objects
->alt_odb_list
; alt
; alt
= alt
->next
) {
916 *path
= alt_sha1_path(alt
, sha1
);
917 fd
= git_open(*path
);
920 if (most_interesting_errno
== ENOENT
)
921 most_interesting_errno
= errno
;
923 errno
= most_interesting_errno
;
928 * Map the loose object at "path" if it is not NULL, or the path found by
929 * searching for a loose object named "sha1".
931 static void *map_sha1_file_1(const char *path
,
932 const unsigned char *sha1
,
941 fd
= open_sha1_file(sha1
, &path
);
946 if (!fstat(fd
, &st
)) {
947 *size
= xsize_t(st
.st_size
);
949 /* mmap() is forbidden on empty files */
950 error("object file %s is empty", path
);
953 map
= xmmap(NULL
, *size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
960 void *map_sha1_file(const unsigned char *sha1
, unsigned long *size
)
962 return map_sha1_file_1(NULL
, sha1
, size
);
965 static int unpack_sha1_short_header(git_zstream
*stream
,
966 unsigned char *map
, unsigned long mapsize
,
967 void *buffer
, unsigned long bufsiz
)
969 /* Get the data stream */
970 memset(stream
, 0, sizeof(*stream
));
971 stream
->next_in
= map
;
972 stream
->avail_in
= mapsize
;
973 stream
->next_out
= buffer
;
974 stream
->avail_out
= bufsiz
;
976 git_inflate_init(stream
);
977 return git_inflate(stream
, 0);
980 int unpack_sha1_header(git_zstream
*stream
,
981 unsigned char *map
, unsigned long mapsize
,
982 void *buffer
, unsigned long bufsiz
)
984 int status
= unpack_sha1_short_header(stream
, map
, mapsize
,
990 /* Make sure we have the terminating NUL */
991 if (!memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
996 static int unpack_sha1_header_to_strbuf(git_zstream
*stream
, unsigned char *map
,
997 unsigned long mapsize
, void *buffer
,
998 unsigned long bufsiz
, struct strbuf
*header
)
1002 status
= unpack_sha1_short_header(stream
, map
, mapsize
, buffer
, bufsiz
);
1007 * Check if entire header is unpacked in the first iteration.
1009 if (memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
1013 * buffer[0..bufsiz] was not large enough. Copy the partial
1014 * result out to header, and then append the result of further
1015 * reading the stream.
1017 strbuf_add(header
, buffer
, stream
->next_out
- (unsigned char *)buffer
);
1018 stream
->next_out
= buffer
;
1019 stream
->avail_out
= bufsiz
;
1022 status
= git_inflate(stream
, 0);
1023 strbuf_add(header
, buffer
, stream
->next_out
- (unsigned char *)buffer
);
1024 if (memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
1026 stream
->next_out
= buffer
;
1027 stream
->avail_out
= bufsiz
;
1028 } while (status
!= Z_STREAM_END
);
1032 static void *unpack_sha1_rest(git_zstream
*stream
, void *buffer
, unsigned long size
, const unsigned char *sha1
)
1034 int bytes
= strlen(buffer
) + 1;
1035 unsigned char *buf
= xmallocz(size
);
1039 n
= stream
->total_out
- bytes
;
1042 memcpy(buf
, (char *) buffer
+ bytes
, n
);
1044 if (bytes
<= size
) {
1046 * The above condition must be (bytes <= size), not
1047 * (bytes < size). In other words, even though we
1048 * expect no more output and set avail_out to zero,
1049 * the input zlib stream may have bytes that express
1050 * "this concludes the stream", and we *do* want to
1053 * Otherwise we would not be able to test that we
1054 * consumed all the input to reach the expected size;
1055 * we also want to check that zlib tells us that all
1056 * went well with status == Z_STREAM_END at the end.
1058 stream
->next_out
= buf
+ bytes
;
1059 stream
->avail_out
= size
- bytes
;
1060 while (status
== Z_OK
)
1061 status
= git_inflate(stream
, Z_FINISH
);
1063 if (status
== Z_STREAM_END
&& !stream
->avail_in
) {
1064 git_inflate_end(stream
);
1069 error("corrupt loose object '%s'", sha1_to_hex(sha1
));
1070 else if (stream
->avail_in
)
1071 error("garbage at end of loose object '%s'",
1078 * We used to just use "sscanf()", but that's actually way
1079 * too permissive for what we want to check. So do an anal
1080 * object header parse by hand.
1082 static int parse_sha1_header_extended(const char *hdr
, struct object_info
*oi
,
1085 const char *type_buf
= hdr
;
1087 int type
, type_len
= 0;
1090 * The type can be of any size but is followed by
1102 type
= type_from_string_gently(type_buf
, type_len
, 1);
1104 strbuf_add(oi
->typename
, type_buf
, type_len
);
1106 * Set type to 0 if its an unknown object and
1107 * we're obtaining the type using '--allow-unknown-type'
1110 if ((flags
& OBJECT_INFO_ALLOW_UNKNOWN_TYPE
) && (type
< 0))
1113 die("invalid object type");
1118 * The length must follow immediately, and be in canonical
1119 * decimal format (ie "010" is not valid).
1121 size
= *hdr
++ - '0';
1126 unsigned long c
= *hdr
- '0';
1130 size
= size
* 10 + c
;
1138 * The length must be followed by a zero byte
1140 return *hdr
? -1 : type
;
1143 int parse_sha1_header(const char *hdr
, unsigned long *sizep
)
1145 struct object_info oi
= OBJECT_INFO_INIT
;
1148 return parse_sha1_header_extended(hdr
, &oi
, 0);
1151 static int sha1_loose_object_info(const unsigned char *sha1
,
1152 struct object_info
*oi
,
1156 unsigned long mapsize
;
1160 struct strbuf hdrbuf
= STRBUF_INIT
;
1161 unsigned long size_scratch
;
1163 if (oi
->delta_base_sha1
)
1164 hashclr(oi
->delta_base_sha1
);
1167 * If we don't care about type or size, then we don't
1168 * need to look inside the object at all. Note that we
1169 * do not optimize out the stat call, even if the
1170 * caller doesn't care about the disk-size, since our
1171 * return value implicitly indicates whether the
1172 * object even exists.
1174 if (!oi
->typep
&& !oi
->typename
&& !oi
->sizep
&& !oi
->contentp
) {
1177 if (stat_sha1_file(sha1
, &st
, &path
) < 0)
1180 *oi
->disk_sizep
= st
.st_size
;
1184 map
= map_sha1_file(sha1
, &mapsize
);
1189 oi
->sizep
= &size_scratch
;
1192 *oi
->disk_sizep
= mapsize
;
1193 if ((flags
& OBJECT_INFO_ALLOW_UNKNOWN_TYPE
)) {
1194 if (unpack_sha1_header_to_strbuf(&stream
, map
, mapsize
, hdr
, sizeof(hdr
), &hdrbuf
) < 0)
1195 status
= error("unable to unpack %s header with --allow-unknown-type",
1197 } else if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0)
1198 status
= error("unable to unpack %s header",
1202 else if (hdrbuf
.len
) {
1203 if ((status
= parse_sha1_header_extended(hdrbuf
.buf
, oi
, flags
)) < 0)
1204 status
= error("unable to parse %s header with --allow-unknown-type",
1206 } else if ((status
= parse_sha1_header_extended(hdr
, oi
, flags
)) < 0)
1207 status
= error("unable to parse %s header", sha1_to_hex(sha1
));
1209 if (status
>= 0 && oi
->contentp
) {
1210 *oi
->contentp
= unpack_sha1_rest(&stream
, hdr
,
1212 if (!*oi
->contentp
) {
1213 git_inflate_end(&stream
);
1217 git_inflate_end(&stream
);
1219 munmap(map
, mapsize
);
1220 if (status
&& oi
->typep
)
1221 *oi
->typep
= status
;
1222 if (oi
->sizep
== &size_scratch
)
1224 strbuf_release(&hdrbuf
);
1225 oi
->whence
= OI_LOOSE
;
1226 return (status
< 0) ? status
: 0;
1229 int fetch_if_missing
= 1;
1231 int sha1_object_info_extended(const unsigned char *sha1
, struct object_info
*oi
, unsigned flags
)
1233 static struct object_info blank_oi
= OBJECT_INFO_INIT
;
1234 struct pack_entry e
;
1236 const unsigned char *real
= (flags
& OBJECT_INFO_LOOKUP_REPLACE
) ?
1237 lookup_replace_object(sha1
) :
1239 int already_retried
= 0;
1241 if (is_null_sha1(real
))
1247 if (!(flags
& OBJECT_INFO_SKIP_CACHED
)) {
1248 struct cached_object
*co
= find_cached_object(real
);
1251 *(oi
->typep
) = co
->type
;
1253 *(oi
->sizep
) = co
->size
;
1255 *(oi
->disk_sizep
) = 0;
1256 if (oi
->delta_base_sha1
)
1257 hashclr(oi
->delta_base_sha1
);
1259 strbuf_addstr(oi
->typename
, typename(co
->type
));
1261 *oi
->contentp
= xmemdupz(co
->buf
, co
->size
);
1262 oi
->whence
= OI_CACHED
;
1268 if (find_pack_entry(real
, &e
))
1271 /* Most likely it's a loose object. */
1272 if (!sha1_loose_object_info(real
, oi
, flags
))
1275 /* Not a loose object; someone else may have just packed it. */
1276 reprepare_packed_git();
1277 if (find_pack_entry(real
, &e
))
1280 /* Check if it is a missing object */
1281 if (fetch_if_missing
&& repository_format_partial_clone
&&
1284 * TODO Investigate haveing fetch_object() return
1285 * TODO error/success and stopping the music here.
1287 fetch_object(repository_format_partial_clone
, real
);
1288 already_retried
= 1;
1295 if (oi
== &blank_oi
)
1297 * We know that the caller doesn't actually need the
1298 * information below, so return early.
1301 rtype
= packed_object_info(e
.p
, e
.offset
, oi
);
1303 mark_bad_packed_object(e
.p
, real
);
1304 return sha1_object_info_extended(real
, oi
, 0);
1305 } else if (oi
->whence
== OI_PACKED
) {
1306 oi
->u
.packed
.offset
= e
.offset
;
1307 oi
->u
.packed
.pack
= e
.p
;
1308 oi
->u
.packed
.is_delta
= (rtype
== OBJ_REF_DELTA
||
1309 rtype
== OBJ_OFS_DELTA
);
1315 /* returns enum object_type or negative */
1316 int sha1_object_info(const unsigned char *sha1
, unsigned long *sizep
)
1318 enum object_type type
;
1319 struct object_info oi
= OBJECT_INFO_INIT
;
1323 if (sha1_object_info_extended(sha1
, &oi
,
1324 OBJECT_INFO_LOOKUP_REPLACE
) < 0)
1329 static void *read_object(const unsigned char *sha1
, enum object_type
*type
,
1330 unsigned long *size
)
1332 struct object_info oi
= OBJECT_INFO_INIT
;
1336 oi
.contentp
= &content
;
1338 if (sha1_object_info_extended(sha1
, &oi
, 0) < 0)
1343 int pretend_sha1_file(void *buf
, unsigned long len
, enum object_type type
,
1344 unsigned char *sha1
)
1346 struct cached_object
*co
;
1348 hash_sha1_file(buf
, len
, typename(type
), sha1
);
1349 if (has_sha1_file(sha1
) || find_cached_object(sha1
))
1351 ALLOC_GROW(cached_objects
, cached_object_nr
+ 1, cached_object_alloc
);
1352 co
= &cached_objects
[cached_object_nr
++];
1355 co
->buf
= xmalloc(len
);
1356 memcpy(co
->buf
, buf
, len
);
1357 hashcpy(co
->sha1
, sha1
);
1362 * This function dies on corrupt objects; the callers who want to
1363 * deal with them should arrange to call read_object() and give error
1364 * messages themselves.
1366 void *read_sha1_file_extended(const unsigned char *sha1
,
1367 enum object_type
*type
,
1368 unsigned long *size
,
1372 const struct packed_git
*p
;
1375 const unsigned char *repl
= lookup_replace
? lookup_replace_object(sha1
)
1379 data
= read_object(repl
, type
, size
);
1383 if (errno
&& errno
!= ENOENT
)
1384 die_errno("failed to read object %s", sha1_to_hex(sha1
));
1386 /* die if we replaced an object with one that does not exist */
1388 die("replacement %s not found for %s",
1389 sha1_to_hex(repl
), sha1_to_hex(sha1
));
1391 if (!stat_sha1_file(repl
, &st
, &path
))
1392 die("loose object %s (stored in %s) is corrupt",
1393 sha1_to_hex(repl
), path
);
1395 if ((p
= has_packed_and_bad(repl
)) != NULL
)
1396 die("packed object %s (stored in %s) is corrupt",
1397 sha1_to_hex(repl
), p
->pack_name
);
1402 void *read_object_with_reference(const unsigned char *sha1
,
1403 const char *required_type_name
,
1404 unsigned long *size
,
1405 unsigned char *actual_sha1_return
)
1407 enum object_type type
, required_type
;
1409 unsigned long isize
;
1410 unsigned char actual_sha1
[20];
1412 required_type
= type_from_string(required_type_name
);
1413 hashcpy(actual_sha1
, sha1
);
1415 int ref_length
= -1;
1416 const char *ref_type
= NULL
;
1418 buffer
= read_sha1_file(actual_sha1
, &type
, &isize
);
1421 if (type
== required_type
) {
1423 if (actual_sha1_return
)
1424 hashcpy(actual_sha1_return
, actual_sha1
);
1427 /* Handle references */
1428 else if (type
== OBJ_COMMIT
)
1430 else if (type
== OBJ_TAG
)
1431 ref_type
= "object ";
1436 ref_length
= strlen(ref_type
);
1438 if (ref_length
+ 40 > isize
||
1439 memcmp(buffer
, ref_type
, ref_length
) ||
1440 get_sha1_hex((char *) buffer
+ ref_length
, actual_sha1
)) {
1445 /* Now we have the ID of the referred-to object in
1446 * actual_sha1. Check again. */
1450 static void write_sha1_file_prepare(const void *buf
, unsigned long len
,
1451 const char *type
, unsigned char *sha1
,
1452 char *hdr
, int *hdrlen
)
1456 /* Generate the header */
1457 *hdrlen
= xsnprintf(hdr
, *hdrlen
, "%s %lu", type
, len
)+1;
1461 git_SHA1_Update(&c
, hdr
, *hdrlen
);
1462 git_SHA1_Update(&c
, buf
, len
);
1463 git_SHA1_Final(sha1
, &c
);
1467 * Move the just written object into its final resting place.
1469 int finalize_object_file(const char *tmpfile
, const char *filename
)
1473 if (object_creation_mode
== OBJECT_CREATION_USES_RENAMES
)
1475 else if (link(tmpfile
, filename
))
1479 * Coda hack - coda doesn't like cross-directory links,
1480 * so we fall back to a rename, which will mean that it
1481 * won't be able to check collisions, but that's not a
1484 * The same holds for FAT formatted media.
1486 * When this succeeds, we just return. We have nothing
1489 if (ret
&& ret
!= EEXIST
) {
1491 if (!rename(tmpfile
, filename
))
1495 unlink_or_warn(tmpfile
);
1497 if (ret
!= EEXIST
) {
1498 return error_errno("unable to write sha1 filename %s", filename
);
1500 /* FIXME!!! Collision check here ? */
1504 if (adjust_shared_perm(filename
))
1505 return error("unable to set permission to '%s'", filename
);
1509 static int write_buffer(int fd
, const void *buf
, size_t len
)
1511 if (write_in_full(fd
, buf
, len
) < 0)
1512 return error_errno("file write error");
1516 int hash_sha1_file(const void *buf
, unsigned long len
, const char *type
,
1517 unsigned char *sha1
)
1520 int hdrlen
= sizeof(hdr
);
1521 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1525 /* Finalize a file on disk, and close it. */
1526 static void close_sha1_file(int fd
)
1528 if (fsync_object_files
)
1529 fsync_or_die(fd
, "sha1 file");
1531 die_errno("error when closing sha1 file");
1534 /* Size of directory component, including the ending '/' */
1535 static inline int directory_size(const char *filename
)
1537 const char *s
= strrchr(filename
, '/');
1540 return s
- filename
+ 1;
1544 * This creates a temporary file in the same directory as the final
1547 * We want to avoid cross-directory filename renames, because those
1548 * can have problems on various filesystems (FAT, NFS, Coda).
1550 static int create_tmpfile(struct strbuf
*tmp
, const char *filename
)
1552 int fd
, dirlen
= directory_size(filename
);
1555 strbuf_add(tmp
, filename
, dirlen
);
1556 strbuf_addstr(tmp
, "tmp_obj_XXXXXX");
1557 fd
= git_mkstemp_mode(tmp
->buf
, 0444);
1558 if (fd
< 0 && dirlen
&& errno
== ENOENT
) {
1560 * Make sure the directory exists; note that the contents
1561 * of the buffer are undefined after mkstemp returns an
1562 * error, so we have to rewrite the whole buffer from
1566 strbuf_add(tmp
, filename
, dirlen
- 1);
1567 if (mkdir(tmp
->buf
, 0777) && errno
!= EEXIST
)
1569 if (adjust_shared_perm(tmp
->buf
))
1573 strbuf_addstr(tmp
, "/tmp_obj_XXXXXX");
1574 fd
= git_mkstemp_mode(tmp
->buf
, 0444);
1579 static int write_loose_object(const unsigned char *sha1
, char *hdr
, int hdrlen
,
1580 const void *buf
, unsigned long len
, time_t mtime
)
1583 unsigned char compressed
[4096];
1586 unsigned char parano_sha1
[20];
1587 static struct strbuf tmp_file
= STRBUF_INIT
;
1588 static struct strbuf filename
= STRBUF_INIT
;
1590 strbuf_reset(&filename
);
1591 sha1_file_name(&filename
, sha1
);
1593 fd
= create_tmpfile(&tmp_file
, filename
.buf
);
1595 if (errno
== EACCES
)
1596 return error("insufficient permission for adding an object to repository database %s", get_object_directory());
1598 return error_errno("unable to create temporary file");
1602 git_deflate_init(&stream
, zlib_compression_level
);
1603 stream
.next_out
= compressed
;
1604 stream
.avail_out
= sizeof(compressed
);
1607 /* First header.. */
1608 stream
.next_in
= (unsigned char *)hdr
;
1609 stream
.avail_in
= hdrlen
;
1610 while (git_deflate(&stream
, 0) == Z_OK
)
1612 git_SHA1_Update(&c
, hdr
, hdrlen
);
1614 /* Then the data itself.. */
1615 stream
.next_in
= (void *)buf
;
1616 stream
.avail_in
= len
;
1618 unsigned char *in0
= stream
.next_in
;
1619 ret
= git_deflate(&stream
, Z_FINISH
);
1620 git_SHA1_Update(&c
, in0
, stream
.next_in
- in0
);
1621 if (write_buffer(fd
, compressed
, stream
.next_out
- compressed
) < 0)
1622 die("unable to write sha1 file");
1623 stream
.next_out
= compressed
;
1624 stream
.avail_out
= sizeof(compressed
);
1625 } while (ret
== Z_OK
);
1627 if (ret
!= Z_STREAM_END
)
1628 die("unable to deflate new object %s (%d)", sha1_to_hex(sha1
), ret
);
1629 ret
= git_deflate_end_gently(&stream
);
1631 die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1
), ret
);
1632 git_SHA1_Final(parano_sha1
, &c
);
1633 if (hashcmp(sha1
, parano_sha1
) != 0)
1634 die("confused by unstable object source data for %s", sha1_to_hex(sha1
));
1636 close_sha1_file(fd
);
1641 utb
.modtime
= mtime
;
1642 if (utime(tmp_file
.buf
, &utb
) < 0)
1643 warning_errno("failed utime() on %s", tmp_file
.buf
);
1646 return finalize_object_file(tmp_file
.buf
, filename
.buf
);
1649 static int freshen_loose_object(const unsigned char *sha1
)
1651 return check_and_freshen(sha1
, 1);
1654 static int freshen_packed_object(const unsigned char *sha1
)
1656 struct pack_entry e
;
1657 if (!find_pack_entry(sha1
, &e
))
1661 if (!freshen_file(e
.p
->pack_name
))
1667 int write_sha1_file(const void *buf
, unsigned long len
, const char *type
, unsigned char *sha1
)
1670 int hdrlen
= sizeof(hdr
);
1672 /* Normally if we have it in the pack then we do not bother writing
1673 * it out into .git/objects/??/?{38} file.
1675 write_sha1_file_prepare(buf
, len
, type
, sha1
, hdr
, &hdrlen
);
1676 if (freshen_packed_object(sha1
) || freshen_loose_object(sha1
))
1678 return write_loose_object(sha1
, hdr
, hdrlen
, buf
, len
, 0);
1681 int hash_sha1_file_literally(const void *buf
, unsigned long len
, const char *type
,
1682 struct object_id
*oid
, unsigned flags
)
1685 int hdrlen
, status
= 0;
1687 /* type string, SP, %lu of the length plus NUL must fit this */
1688 hdrlen
= strlen(type
) + 32;
1689 header
= xmalloc(hdrlen
);
1690 write_sha1_file_prepare(buf
, len
, type
, oid
->hash
, header
, &hdrlen
);
1692 if (!(flags
& HASH_WRITE_OBJECT
))
1694 if (freshen_packed_object(oid
->hash
) || freshen_loose_object(oid
->hash
))
1696 status
= write_loose_object(oid
->hash
, header
, hdrlen
, buf
, len
, 0);
1703 int force_object_loose(const unsigned char *sha1
, time_t mtime
)
1707 enum object_type type
;
1712 if (has_loose_object(sha1
))
1714 buf
= read_object(sha1
, &type
, &len
);
1716 return error("cannot read sha1_file for %s", sha1_to_hex(sha1
));
1717 hdrlen
= xsnprintf(hdr
, sizeof(hdr
), "%s %lu", typename(type
), len
) + 1;
1718 ret
= write_loose_object(sha1
, hdr
, hdrlen
, buf
, len
, mtime
);
1724 int has_sha1_file_with_flags(const unsigned char *sha1
, int flags
)
1726 if (!startup_info
->have_repository
)
1728 return sha1_object_info_extended(sha1
, NULL
,
1729 flags
| OBJECT_INFO_SKIP_CACHED
) >= 0;
1732 int has_object_file(const struct object_id
*oid
)
1734 return has_sha1_file(oid
->hash
);
1737 int has_object_file_with_flags(const struct object_id
*oid
, int flags
)
1739 return has_sha1_file_with_flags(oid
->hash
, flags
);
1742 static void check_tree(const void *buf
, size_t size
)
1744 struct tree_desc desc
;
1745 struct name_entry entry
;
1747 init_tree_desc(&desc
, buf
, size
);
1748 while (tree_entry(&desc
, &entry
))
1750 * tree_entry() will die() on malformed entries */
1754 static void check_commit(const void *buf
, size_t size
)
1757 memset(&c
, 0, sizeof(c
));
1758 if (parse_commit_buffer(&c
, buf
, size
))
1759 die("corrupt commit");
1762 static void check_tag(const void *buf
, size_t size
)
1765 memset(&t
, 0, sizeof(t
));
1766 if (parse_tag_buffer(&t
, buf
, size
))
1770 static int index_mem(struct object_id
*oid
, void *buf
, size_t size
,
1771 enum object_type type
,
1772 const char *path
, unsigned flags
)
1774 int ret
, re_allocated
= 0;
1775 int write_object
= flags
& HASH_WRITE_OBJECT
;
1781 * Convert blobs to git internal format
1783 if ((type
== OBJ_BLOB
) && path
) {
1784 struct strbuf nbuf
= STRBUF_INIT
;
1785 if (convert_to_git(&the_index
, path
, buf
, size
, &nbuf
,
1786 get_conv_flags(flags
))) {
1787 buf
= strbuf_detach(&nbuf
, &size
);
1791 if (flags
& HASH_FORMAT_CHECK
) {
1792 if (type
== OBJ_TREE
)
1793 check_tree(buf
, size
);
1794 if (type
== OBJ_COMMIT
)
1795 check_commit(buf
, size
);
1796 if (type
== OBJ_TAG
)
1797 check_tag(buf
, size
);
1801 ret
= write_sha1_file(buf
, size
, typename(type
), oid
->hash
);
1803 ret
= hash_sha1_file(buf
, size
, typename(type
), oid
->hash
);
1809 static int index_stream_convert_blob(struct object_id
*oid
, int fd
,
1810 const char *path
, unsigned flags
)
1813 const int write_object
= flags
& HASH_WRITE_OBJECT
;
1814 struct strbuf sbuf
= STRBUF_INIT
;
1817 assert(would_convert_to_git_filter_fd(path
));
1819 convert_to_git_filter_fd(&the_index
, path
, fd
, &sbuf
,
1820 get_conv_flags(flags
));
1823 ret
= write_sha1_file(sbuf
.buf
, sbuf
.len
, typename(OBJ_BLOB
),
1826 ret
= hash_sha1_file(sbuf
.buf
, sbuf
.len
, typename(OBJ_BLOB
),
1828 strbuf_release(&sbuf
);
1832 static int index_pipe(struct object_id
*oid
, int fd
, enum object_type type
,
1833 const char *path
, unsigned flags
)
1835 struct strbuf sbuf
= STRBUF_INIT
;
1838 if (strbuf_read(&sbuf
, fd
, 4096) >= 0)
1839 ret
= index_mem(oid
, sbuf
.buf
, sbuf
.len
, type
, path
, flags
);
1842 strbuf_release(&sbuf
);
1846 #define SMALL_FILE_SIZE (32*1024)
1848 static int index_core(struct object_id
*oid
, int fd
, size_t size
,
1849 enum object_type type
, const char *path
,
1855 ret
= index_mem(oid
, "", size
, type
, path
, flags
);
1856 } else if (size
<= SMALL_FILE_SIZE
) {
1857 char *buf
= xmalloc(size
);
1858 ssize_t read_result
= read_in_full(fd
, buf
, size
);
1859 if (read_result
< 0)
1860 ret
= error_errno("read error while indexing %s",
1861 path
? path
: "<unknown>");
1862 else if (read_result
!= size
)
1863 ret
= error("short read while indexing %s",
1864 path
? path
: "<unknown>");
1866 ret
= index_mem(oid
, buf
, size
, type
, path
, flags
);
1869 void *buf
= xmmap(NULL
, size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
1870 ret
= index_mem(oid
, buf
, size
, type
, path
, flags
);
1877 * This creates one packfile per large blob unless bulk-checkin
1878 * machinery is "plugged".
1880 * This also bypasses the usual "convert-to-git" dance, and that is on
1881 * purpose. We could write a streaming version of the converting
1882 * functions and insert that before feeding the data to fast-import
1883 * (or equivalent in-core API described above). However, that is
1884 * somewhat complicated, as we do not know the size of the filter
1885 * result, which we need to know beforehand when writing a git object.
1886 * Since the primary motivation for trying to stream from the working
1887 * tree file and to avoid mmaping it in core is to deal with large
1888 * binary blobs, they generally do not want to get any conversion, and
1889 * callers should avoid this code path when filters are requested.
1891 static int index_stream(struct object_id
*oid
, int fd
, size_t size
,
1892 enum object_type type
, const char *path
,
1895 return index_bulk_checkin(oid
->hash
, fd
, size
, type
, path
, flags
);
1898 int index_fd(struct object_id
*oid
, int fd
, struct stat
*st
,
1899 enum object_type type
, const char *path
, unsigned flags
)
1904 * Call xsize_t() only when needed to avoid potentially unnecessary
1905 * die() for large files.
1907 if (type
== OBJ_BLOB
&& path
&& would_convert_to_git_filter_fd(path
))
1908 ret
= index_stream_convert_blob(oid
, fd
, path
, flags
);
1909 else if (!S_ISREG(st
->st_mode
))
1910 ret
= index_pipe(oid
, fd
, type
, path
, flags
);
1911 else if (st
->st_size
<= big_file_threshold
|| type
!= OBJ_BLOB
||
1912 (path
&& would_convert_to_git(&the_index
, path
)))
1913 ret
= index_core(oid
, fd
, xsize_t(st
->st_size
), type
, path
,
1916 ret
= index_stream(oid
, fd
, xsize_t(st
->st_size
), type
, path
,
1922 int index_path(struct object_id
*oid
, const char *path
, struct stat
*st
, unsigned flags
)
1925 struct strbuf sb
= STRBUF_INIT
;
1928 switch (st
->st_mode
& S_IFMT
) {
1930 fd
= open(path
, O_RDONLY
);
1932 return error_errno("open(\"%s\")", path
);
1933 if (index_fd(oid
, fd
, st
, OBJ_BLOB
, path
, flags
) < 0)
1934 return error("%s: failed to insert into database",
1938 if (strbuf_readlink(&sb
, path
, st
->st_size
))
1939 return error_errno("readlink(\"%s\")", path
);
1940 if (!(flags
& HASH_WRITE_OBJECT
))
1941 hash_sha1_file(sb
.buf
, sb
.len
, blob_type
, oid
->hash
);
1942 else if (write_sha1_file(sb
.buf
, sb
.len
, blob_type
, oid
->hash
))
1943 rc
= error("%s: failed to insert into database", path
);
1944 strbuf_release(&sb
);
1947 return resolve_gitlink_ref(path
, "HEAD", oid
);
1949 return error("%s: unsupported file type", path
);
1954 int read_pack_header(int fd
, struct pack_header
*header
)
1956 if (read_in_full(fd
, header
, sizeof(*header
)) != sizeof(*header
))
1957 /* "eof before pack header was fully read" */
1958 return PH_ERROR_EOF
;
1960 if (header
->hdr_signature
!= htonl(PACK_SIGNATURE
))
1961 /* "protocol error (pack signature mismatch detected)" */
1962 return PH_ERROR_PACK_SIGNATURE
;
1963 if (!pack_version_ok(header
->hdr_version
))
1964 /* "protocol error (pack version unsupported)" */
1965 return PH_ERROR_PROTOCOL
;
1969 void assert_sha1_type(const unsigned char *sha1
, enum object_type expect
)
1971 enum object_type type
= sha1_object_info(sha1
, NULL
);
1973 die("%s is not a valid object", sha1_to_hex(sha1
));
1975 die("%s is not a valid '%s' object", sha1_to_hex(sha1
),
1979 int for_each_file_in_obj_subdir(unsigned int subdir_nr
,
1980 struct strbuf
*path
,
1981 each_loose_object_fn obj_cb
,
1982 each_loose_cruft_fn cruft_cb
,
1983 each_loose_subdir_fn subdir_cb
,
1986 size_t origlen
, baselen
;
1990 struct object_id oid
;
1992 if (subdir_nr
> 0xff)
1993 BUG("invalid loose object subdirectory: %x", subdir_nr
);
1995 origlen
= path
->len
;
1996 strbuf_complete(path
, '/');
1997 strbuf_addf(path
, "%02x", subdir_nr
);
1999 dir
= opendir(path
->buf
);
2001 if (errno
!= ENOENT
)
2002 r
= error_errno("unable to open %s", path
->buf
);
2003 strbuf_setlen(path
, origlen
);
2007 oid
.hash
[0] = subdir_nr
;
2008 strbuf_addch(path
, '/');
2009 baselen
= path
->len
;
2011 while ((de
= readdir(dir
))) {
2013 if (is_dot_or_dotdot(de
->d_name
))
2016 namelen
= strlen(de
->d_name
);
2017 strbuf_setlen(path
, baselen
);
2018 strbuf_add(path
, de
->d_name
, namelen
);
2019 if (namelen
== GIT_SHA1_HEXSZ
- 2 &&
2020 !hex_to_bytes(oid
.hash
+ 1, de
->d_name
,
2021 GIT_SHA1_RAWSZ
- 1)) {
2023 r
= obj_cb(&oid
, path
->buf
, data
);
2031 r
= cruft_cb(de
->d_name
, path
->buf
, data
);
2038 strbuf_setlen(path
, baselen
- 1);
2039 if (!r
&& subdir_cb
)
2040 r
= subdir_cb(subdir_nr
, path
->buf
, data
);
2042 strbuf_setlen(path
, origlen
);
2047 int for_each_loose_file_in_objdir_buf(struct strbuf
*path
,
2048 each_loose_object_fn obj_cb
,
2049 each_loose_cruft_fn cruft_cb
,
2050 each_loose_subdir_fn subdir_cb
,
2056 for (i
= 0; i
< 256; i
++) {
2057 r
= for_each_file_in_obj_subdir(i
, path
, obj_cb
, cruft_cb
,
2066 int for_each_loose_file_in_objdir(const char *path
,
2067 each_loose_object_fn obj_cb
,
2068 each_loose_cruft_fn cruft_cb
,
2069 each_loose_subdir_fn subdir_cb
,
2072 struct strbuf buf
= STRBUF_INIT
;
2075 strbuf_addstr(&buf
, path
);
2076 r
= for_each_loose_file_in_objdir_buf(&buf
, obj_cb
, cruft_cb
,
2078 strbuf_release(&buf
);
2083 struct loose_alt_odb_data
{
2084 each_loose_object_fn
*cb
;
2088 static int loose_from_alt_odb(struct alternate_object_database
*alt
,
2091 struct loose_alt_odb_data
*data
= vdata
;
2092 struct strbuf buf
= STRBUF_INIT
;
2095 strbuf_addstr(&buf
, alt
->path
);
2096 r
= for_each_loose_file_in_objdir_buf(&buf
,
2097 data
->cb
, NULL
, NULL
,
2099 strbuf_release(&buf
);
2103 int for_each_loose_object(each_loose_object_fn cb
, void *data
, unsigned flags
)
2105 struct loose_alt_odb_data alt
;
2108 r
= for_each_loose_file_in_objdir(get_object_directory(),
2109 cb
, NULL
, NULL
, data
);
2113 if (flags
& FOR_EACH_OBJECT_LOCAL_ONLY
)
2118 return foreach_alt_odb(loose_from_alt_odb
, &alt
);
2121 static int check_stream_sha1(git_zstream
*stream
,
2125 const unsigned char *expected_sha1
)
2128 unsigned char real_sha1
[GIT_MAX_RAWSZ
];
2129 unsigned char buf
[4096];
2130 unsigned long total_read
;
2134 git_SHA1_Update(&c
, hdr
, stream
->total_out
);
2137 * We already read some bytes into hdr, but the ones up to the NUL
2138 * do not count against the object's content size.
2140 total_read
= stream
->total_out
- strlen(hdr
) - 1;
2143 * This size comparison must be "<=" to read the final zlib packets;
2144 * see the comment in unpack_sha1_rest for details.
2146 while (total_read
<= size
&&
2147 (status
== Z_OK
|| status
== Z_BUF_ERROR
)) {
2148 stream
->next_out
= buf
;
2149 stream
->avail_out
= sizeof(buf
);
2150 if (size
- total_read
< stream
->avail_out
)
2151 stream
->avail_out
= size
- total_read
;
2152 status
= git_inflate(stream
, Z_FINISH
);
2153 git_SHA1_Update(&c
, buf
, stream
->next_out
- buf
);
2154 total_read
+= stream
->next_out
- buf
;
2156 git_inflate_end(stream
);
2158 if (status
!= Z_STREAM_END
) {
2159 error("corrupt loose object '%s'", sha1_to_hex(expected_sha1
));
2162 if (stream
->avail_in
) {
2163 error("garbage at end of loose object '%s'",
2164 sha1_to_hex(expected_sha1
));
2168 git_SHA1_Final(real_sha1
, &c
);
2169 if (hashcmp(expected_sha1
, real_sha1
)) {
2170 error("sha1 mismatch for %s (expected %s)", path
,
2171 sha1_to_hex(expected_sha1
));
2178 int read_loose_object(const char *path
,
2179 const unsigned char *expected_sha1
,
2180 enum object_type
*type
,
2181 unsigned long *size
,
2186 unsigned long mapsize
;
2192 map
= map_sha1_file_1(path
, NULL
, &mapsize
);
2194 error_errno("unable to mmap %s", path
);
2198 if (unpack_sha1_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0) {
2199 error("unable to unpack header of %s", path
);
2203 *type
= parse_sha1_header(hdr
, size
);
2205 error("unable to parse header of %s", path
);
2206 git_inflate_end(&stream
);
2210 if (*type
== OBJ_BLOB
) {
2211 if (check_stream_sha1(&stream
, hdr
, *size
, path
, expected_sha1
) < 0)
2214 *contents
= unpack_sha1_rest(&stream
, hdr
, *size
, expected_sha1
);
2216 error("unable to unpack contents of %s", path
);
2217 git_inflate_end(&stream
);
2220 if (check_sha1_signature(expected_sha1
, *contents
,
2221 *size
, typename(*type
))) {
2222 error("sha1 mismatch for %s (expected %s)", path
,
2223 sha1_to_hex(expected_sha1
));
2229 ret
= 0; /* everything checks out */
2233 munmap(map
, mapsize
);