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 "replace-object.h"
27 #include "streaming.h"
30 #include "mergesort.h"
33 #include "object-store.h"
34 #include "promisor-remote.h"
36 /* The maximum size for an object header. */
37 #define MAX_HEADER_LEN 32
40 #define EMPTY_TREE_SHA1_BIN_LITERAL \
41 "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \
42 "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"
43 #define EMPTY_TREE_SHA256_BIN_LITERAL \
44 "\x6e\xf1\x9b\x41\x22\x5c\x53\x69\xf1\xc1" \
45 "\x04\xd4\x5d\x8d\x85\xef\xa9\xb0\x57\xb5" \
46 "\x3b\x14\xb4\xb9\xb9\x39\xdd\x74\xde\xcc" \
49 #define EMPTY_BLOB_SHA1_BIN_LITERAL \
50 "\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \
51 "\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91"
52 #define EMPTY_BLOB_SHA256_BIN_LITERAL \
53 "\x47\x3a\x0f\x4c\x3b\xe8\xa9\x36\x81\xa2" \
54 "\x67\xe3\xb1\xe9\xa7\xdc\xda\x11\x85\x43" \
55 "\x6f\xe1\x41\xf7\x74\x91\x20\xa3\x03\x72" \
58 const struct object_id null_oid
;
59 static const struct object_id empty_tree_oid
= {
60 EMPTY_TREE_SHA1_BIN_LITERAL
62 static const struct object_id empty_blob_oid
= {
63 EMPTY_BLOB_SHA1_BIN_LITERAL
65 static const struct object_id empty_tree_oid_sha256
= {
66 EMPTY_TREE_SHA256_BIN_LITERAL
68 static const struct object_id empty_blob_oid_sha256
= {
69 EMPTY_BLOB_SHA256_BIN_LITERAL
72 static void git_hash_sha1_init(git_hash_ctx
*ctx
)
74 git_SHA1_Init(&ctx
->sha1
);
77 static void git_hash_sha1_clone(git_hash_ctx
*dst
, const git_hash_ctx
*src
)
79 git_SHA1_Clone(&dst
->sha1
, &src
->sha1
);
82 static void git_hash_sha1_update(git_hash_ctx
*ctx
, const void *data
, size_t len
)
84 git_SHA1_Update(&ctx
->sha1
, data
, len
);
87 static void git_hash_sha1_final(unsigned char *hash
, git_hash_ctx
*ctx
)
89 git_SHA1_Final(hash
, &ctx
->sha1
);
93 static void git_hash_sha256_init(git_hash_ctx
*ctx
)
95 git_SHA256_Init(&ctx
->sha256
);
98 static void git_hash_sha256_clone(git_hash_ctx
*dst
, const git_hash_ctx
*src
)
100 git_SHA256_Clone(&dst
->sha256
, &src
->sha256
);
103 static void git_hash_sha256_update(git_hash_ctx
*ctx
, const void *data
, size_t len
)
105 git_SHA256_Update(&ctx
->sha256
, data
, len
);
108 static void git_hash_sha256_final(unsigned char *hash
, git_hash_ctx
*ctx
)
110 git_SHA256_Final(hash
, &ctx
->sha256
);
113 static void git_hash_unknown_init(git_hash_ctx
*ctx
)
115 BUG("trying to init unknown hash");
118 static void git_hash_unknown_clone(git_hash_ctx
*dst
, const git_hash_ctx
*src
)
120 BUG("trying to clone unknown hash");
123 static void git_hash_unknown_update(git_hash_ctx
*ctx
, const void *data
, size_t len
)
125 BUG("trying to update unknown hash");
128 static void git_hash_unknown_final(unsigned char *hash
, git_hash_ctx
*ctx
)
130 BUG("trying to finalize unknown hash");
133 const struct git_hash_algo hash_algos
[GIT_HASH_NALGOS
] = {
140 git_hash_unknown_init
,
141 git_hash_unknown_clone
,
142 git_hash_unknown_update
,
143 git_hash_unknown_final
,
149 /* "sha1", big-endian */
156 git_hash_sha1_update
,
163 /* "s256", big-endian */
168 git_hash_sha256_init
,
169 git_hash_sha256_clone
,
170 git_hash_sha256_update
,
171 git_hash_sha256_final
,
172 &empty_tree_oid_sha256
,
173 &empty_blob_oid_sha256
,
177 const char *empty_tree_oid_hex(void)
179 static char buf
[GIT_MAX_HEXSZ
+ 1];
180 return oid_to_hex_r(buf
, the_hash_algo
->empty_tree
);
183 const char *empty_blob_oid_hex(void)
185 static char buf
[GIT_MAX_HEXSZ
+ 1];
186 return oid_to_hex_r(buf
, the_hash_algo
->empty_blob
);
189 int hash_algo_by_name(const char *name
)
193 return GIT_HASH_UNKNOWN
;
194 for (i
= 1; i
< GIT_HASH_NALGOS
; i
++)
195 if (!strcmp(name
, hash_algos
[i
].name
))
197 return GIT_HASH_UNKNOWN
;
200 int hash_algo_by_id(uint32_t format_id
)
203 for (i
= 1; i
< GIT_HASH_NALGOS
; i
++)
204 if (format_id
== hash_algos
[i
].format_id
)
206 return GIT_HASH_UNKNOWN
;
209 int hash_algo_by_length(int len
)
212 for (i
= 1; i
< GIT_HASH_NALGOS
; i
++)
213 if (len
== hash_algos
[i
].rawsz
)
215 return GIT_HASH_UNKNOWN
;
219 * This is meant to hold a *small* number of objects that you would
220 * want read_object_file() to be able to return, but yet you do not want
221 * to write them into the object store (e.g. a browse-only
224 static struct cached_object
{
225 struct object_id oid
;
226 enum object_type type
;
230 static int cached_object_nr
, cached_object_alloc
;
232 static struct cached_object empty_tree
= {
233 { EMPTY_TREE_SHA1_BIN_LITERAL
},
239 static struct cached_object
*find_cached_object(const struct object_id
*oid
)
242 struct cached_object
*co
= cached_objects
;
244 for (i
= 0; i
< cached_object_nr
; i
++, co
++) {
245 if (oideq(&co
->oid
, oid
))
248 if (oideq(oid
, the_hash_algo
->empty_tree
))
254 static int get_conv_flags(unsigned flags
)
256 if (flags
& HASH_RENORMALIZE
)
257 return CONV_EOL_RENORMALIZE
;
258 else if (flags
& HASH_WRITE_OBJECT
)
259 return global_conv_flags_eol
| CONV_WRITE_OBJECT
;
265 int mkdir_in_gitdir(const char *path
)
267 if (mkdir(path
, 0777)) {
268 int saved_errno
= errno
;
270 struct strbuf sb
= STRBUF_INIT
;
275 * Are we looking at a path in a symlinked worktree
276 * whose original repository does not yet have it?
277 * e.g. .git/rr-cache pointing at its original
278 * repository in which the user hasn't performed any
279 * conflict resolution yet?
281 if (lstat(path
, &st
) || !S_ISLNK(st
.st_mode
) ||
282 strbuf_readlink(&sb
, path
, st
.st_size
) ||
283 !is_absolute_path(sb
.buf
) ||
284 mkdir(sb
.buf
, 0777)) {
291 return adjust_shared_perm(path
);
294 enum scld_error
safe_create_leading_directories(char *path
)
296 char *next_component
= path
+ offset_1st_component(path
);
297 enum scld_error ret
= SCLD_OK
;
299 while (ret
== SCLD_OK
&& next_component
) {
301 char *slash
= next_component
, slash_character
;
303 while (*slash
&& !is_dir_sep(*slash
))
309 next_component
= slash
+ 1;
310 while (is_dir_sep(*next_component
))
312 if (!*next_component
)
315 slash_character
= *slash
;
317 if (!stat(path
, &st
)) {
319 if (!S_ISDIR(st
.st_mode
)) {
323 } else if (mkdir(path
, 0777)) {
324 if (errno
== EEXIST
&&
325 !stat(path
, &st
) && S_ISDIR(st
.st_mode
))
326 ; /* somebody created it since we checked */
327 else if (errno
== ENOENT
)
329 * Either mkdir() failed because
330 * somebody just pruned the containing
331 * directory, or stat() failed because
332 * the file that was in our way was
333 * just removed. Either way, inform
334 * the caller that it might be worth
340 } else if (adjust_shared_perm(path
)) {
343 *slash
= slash_character
;
348 enum scld_error
safe_create_leading_directories_const(const char *path
)
351 /* path points to cache entries, so xstrdup before messing with it */
352 char *buf
= xstrdup(path
);
353 enum scld_error result
= safe_create_leading_directories(buf
);
361 int raceproof_create_file(const char *path
, create_file_fn fn
, void *cb
)
364 * The number of times we will try to remove empty directories
365 * in the way of path. This is only 1 because if another
366 * process is racily creating directories that conflict with
367 * us, we don't want to fight against them.
369 int remove_directories_remaining
= 1;
372 * The number of times that we will try to create the
373 * directories containing path. We are willing to attempt this
374 * more than once, because another process could be trying to
375 * clean up empty directories at the same time as we are
376 * trying to create them.
378 int create_directories_remaining
= 3;
380 /* A scratch copy of path, filled lazily if we need it: */
381 struct strbuf path_copy
= STRBUF_INIT
;
394 if (errno
== EISDIR
&& remove_directories_remaining
-- > 0) {
396 * A directory is in the way. Maybe it is empty; try
400 strbuf_addstr(&path_copy
, path
);
402 if (!remove_dir_recursively(&path_copy
, REMOVE_DIR_EMPTY_ONLY
))
404 } else if (errno
== ENOENT
&& create_directories_remaining
-- > 0) {
406 * Maybe the containing directory didn't exist, or
407 * maybe it was just deleted by a process that is
408 * racing with us to clean up empty directories. Try
411 enum scld_error scld_result
;
414 strbuf_addstr(&path_copy
, path
);
417 scld_result
= safe_create_leading_directories(path_copy
.buf
);
418 if (scld_result
== SCLD_OK
)
420 } while (scld_result
== SCLD_VANISHED
&& create_directories_remaining
-- > 0);
424 strbuf_release(&path_copy
);
429 static void fill_loose_path(struct strbuf
*buf
, const struct object_id
*oid
)
432 for (i
= 0; i
< the_hash_algo
->rawsz
; i
++) {
433 static char hex
[] = "0123456789abcdef";
434 unsigned int val
= oid
->hash
[i
];
435 strbuf_addch(buf
, hex
[val
>> 4]);
436 strbuf_addch(buf
, hex
[val
& 0xf]);
438 strbuf_addch(buf
, '/');
442 static const char *odb_loose_path(struct object_directory
*odb
,
444 const struct object_id
*oid
)
447 strbuf_addstr(buf
, odb
->path
);
448 strbuf_addch(buf
, '/');
449 fill_loose_path(buf
, oid
);
453 const char *loose_object_path(struct repository
*r
, struct strbuf
*buf
,
454 const struct object_id
*oid
)
456 return odb_loose_path(r
->objects
->odb
, buf
, oid
);
460 * Return non-zero iff the path is usable as an alternate object database.
462 static int alt_odb_usable(struct raw_object_store
*o
,
464 const char *normalized_objdir
)
466 struct object_directory
*odb
;
468 /* Detect cases where alternate disappeared */
469 if (!is_directory(path
->buf
)) {
470 error(_("object directory %s does not exist; "
471 "check .git/objects/info/alternates"),
477 * Prevent the common mistake of listing the same
478 * thing twice, or object directory itself.
480 for (odb
= o
->odb
; odb
; odb
= odb
->next
) {
481 if (!fspathcmp(path
->buf
, odb
->path
))
484 if (!fspathcmp(path
->buf
, normalized_objdir
))
491 * Prepare alternate object database registry.
493 * The variable alt_odb_list points at the list of struct
494 * object_directory. The elements on this list come from
495 * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
496 * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
497 * whose contents is similar to that environment variable but can be
498 * LF separated. Its base points at a statically allocated buffer that
499 * contains "/the/directory/corresponding/to/.git/objects/...", while
500 * its name points just after the slash at the end of ".git/objects/"
501 * in the example above, and has enough space to hold 40-byte hex
502 * SHA1, an extra slash for the first level indirection, and the
505 static void read_info_alternates(struct repository
*r
,
506 const char *relative_base
,
508 static int link_alt_odb_entry(struct repository
*r
, const char *entry
,
509 const char *relative_base
, int depth
, const char *normalized_objdir
)
511 struct object_directory
*ent
;
512 struct strbuf pathbuf
= STRBUF_INIT
;
514 if (!is_absolute_path(entry
) && relative_base
) {
515 strbuf_realpath(&pathbuf
, relative_base
, 1);
516 strbuf_addch(&pathbuf
, '/');
518 strbuf_addstr(&pathbuf
, entry
);
520 if (strbuf_normalize_path(&pathbuf
) < 0 && relative_base
) {
521 error(_("unable to normalize alternate object path: %s"),
523 strbuf_release(&pathbuf
);
528 * The trailing slash after the directory name is given by
529 * this function at the end. Remove duplicates.
531 while (pathbuf
.len
&& pathbuf
.buf
[pathbuf
.len
- 1] == '/')
532 strbuf_setlen(&pathbuf
, pathbuf
.len
- 1);
534 if (!alt_odb_usable(r
->objects
, &pathbuf
, normalized_objdir
)) {
535 strbuf_release(&pathbuf
);
539 ent
= xcalloc(1, sizeof(*ent
));
540 ent
->path
= xstrdup(pathbuf
.buf
);
542 /* add the alternate entry */
543 *r
->objects
->odb_tail
= ent
;
544 r
->objects
->odb_tail
= &(ent
->next
);
547 /* recursively add alternates */
548 read_info_alternates(r
, pathbuf
.buf
, depth
+ 1);
550 strbuf_release(&pathbuf
);
554 static const char *parse_alt_odb_entry(const char *string
,
562 if (*string
== '#') {
563 /* comment; consume up to next separator */
564 end
= strchrnul(string
, sep
);
565 } else if (*string
== '"' && !unquote_c_style(out
, string
, &end
)) {
567 * quoted path; unquote_c_style has copied the
568 * data for us and set "end". Broken quoting (e.g.,
569 * an entry that doesn't end with a quote) falls
570 * back to the unquoted case below.
573 /* normal, unquoted path */
574 end
= strchrnul(string
, sep
);
575 strbuf_add(out
, string
, end
- string
);
583 static void link_alt_odb_entries(struct repository
*r
, const char *alt
,
584 int sep
, const char *relative_base
, int depth
)
586 struct strbuf objdirbuf
= STRBUF_INIT
;
587 struct strbuf entry
= STRBUF_INIT
;
593 error(_("%s: ignoring alternate object stores, nesting too deep"),
598 strbuf_add_absolute_path(&objdirbuf
, r
->objects
->odb
->path
);
599 if (strbuf_normalize_path(&objdirbuf
) < 0)
600 die(_("unable to normalize object directory: %s"),
604 alt
= parse_alt_odb_entry(alt
, sep
, &entry
);
607 link_alt_odb_entry(r
, entry
.buf
,
608 relative_base
, depth
, objdirbuf
.buf
);
610 strbuf_release(&entry
);
611 strbuf_release(&objdirbuf
);
614 static void read_info_alternates(struct repository
*r
,
615 const char *relative_base
,
619 struct strbuf buf
= STRBUF_INIT
;
621 path
= xstrfmt("%s/info/alternates", relative_base
);
622 if (strbuf_read_file(&buf
, path
, 1024) < 0) {
623 warn_on_fopen_errors(path
);
628 link_alt_odb_entries(r
, buf
.buf
, '\n', relative_base
, depth
);
629 strbuf_release(&buf
);
633 void add_to_alternates_file(const char *reference
)
635 struct lock_file lock
= LOCK_INIT
;
636 char *alts
= git_pathdup("objects/info/alternates");
640 hold_lock_file_for_update(&lock
, alts
, LOCK_DIE_ON_ERROR
);
641 out
= fdopen_lock_file(&lock
, "w");
643 die_errno(_("unable to fdopen alternates lockfile"));
645 in
= fopen(alts
, "r");
647 struct strbuf line
= STRBUF_INIT
;
649 while (strbuf_getline(&line
, in
) != EOF
) {
650 if (!strcmp(reference
, line
.buf
)) {
654 fprintf_or_die(out
, "%s\n", line
.buf
);
657 strbuf_release(&line
);
660 else if (errno
!= ENOENT
)
661 die_errno(_("unable to read alternates file"));
664 rollback_lock_file(&lock
);
666 fprintf_or_die(out
, "%s\n", reference
);
667 if (commit_lock_file(&lock
))
668 die_errno(_("unable to move new alternates file into place"));
669 if (the_repository
->objects
->loaded_alternates
)
670 link_alt_odb_entries(the_repository
, reference
,
676 void add_to_alternates_memory(const char *reference
)
679 * Make sure alternates are initialized, or else our entry may be
680 * overwritten when they are.
682 prepare_alt_odb(the_repository
);
684 link_alt_odb_entries(the_repository
, reference
,
689 * Compute the exact path an alternate is at and returns it. In case of
690 * error NULL is returned and the human readable error is added to `err`
691 * `path` may be relative and should point to $GIT_DIR.
692 * `err` must not be null.
694 char *compute_alternate_path(const char *path
, struct strbuf
*err
)
696 char *ref_git
= NULL
;
697 const char *repo
, *ref_git_s
;
700 ref_git_s
= real_path_if_valid(path
);
703 strbuf_addf(err
, _("path '%s' does not exist"), path
);
707 * Beware: read_gitfile(), real_path() and mkpath()
708 * return static buffer
710 ref_git
= xstrdup(ref_git_s
);
712 repo
= read_gitfile(ref_git
);
714 repo
= read_gitfile(mkpath("%s/.git", ref_git
));
717 ref_git
= xstrdup(repo
);
720 if (!repo
&& is_directory(mkpath("%s/.git/objects", ref_git
))) {
721 char *ref_git_git
= mkpathdup("%s/.git", ref_git
);
723 ref_git
= ref_git_git
;
724 } else if (!is_directory(mkpath("%s/objects", ref_git
))) {
725 struct strbuf sb
= STRBUF_INIT
;
727 if (get_common_dir(&sb
, ref_git
)) {
729 _("reference repository '%s' as a linked "
730 "checkout is not supported yet."),
735 strbuf_addf(err
, _("reference repository '%s' is not a "
736 "local repository."), path
);
740 if (!access(mkpath("%s/shallow", ref_git
), F_OK
)) {
741 strbuf_addf(err
, _("reference repository '%s' is shallow"),
747 if (!access(mkpath("%s/info/grafts", ref_git
), F_OK
)) {
749 _("reference repository '%s' is grafted"),
757 FREE_AND_NULL(ref_git
);
763 static void fill_alternate_refs_command(struct child_process
*cmd
,
764 const char *repo_path
)
768 if (!git_config_get_value("core.alternateRefsCommand", &value
)) {
771 argv_array_push(&cmd
->args
, value
);
772 argv_array_push(&cmd
->args
, repo_path
);
776 argv_array_pushf(&cmd
->args
, "--git-dir=%s", repo_path
);
777 argv_array_push(&cmd
->args
, "for-each-ref");
778 argv_array_push(&cmd
->args
, "--format=%(objectname)");
780 if (!git_config_get_value("core.alternateRefsPrefixes", &value
)) {
781 argv_array_push(&cmd
->args
, "--");
782 argv_array_split(&cmd
->args
, value
);
786 cmd
->env
= local_repo_env
;
790 static void read_alternate_refs(const char *path
,
791 alternate_ref_fn
*cb
,
794 struct child_process cmd
= CHILD_PROCESS_INIT
;
795 struct strbuf line
= STRBUF_INIT
;
798 fill_alternate_refs_command(&cmd
, path
);
800 if (start_command(&cmd
))
803 fh
= xfdopen(cmd
.out
, "r");
804 while (strbuf_getline_lf(&line
, fh
) != EOF
) {
805 struct object_id oid
;
808 if (parse_oid_hex(line
.buf
, &oid
, &p
) || *p
) {
809 warning(_("invalid line while parsing alternate refs: %s"),
818 finish_command(&cmd
);
819 strbuf_release(&line
);
822 struct alternate_refs_data
{
823 alternate_ref_fn
*fn
;
827 static int refs_from_alternate_cb(struct object_directory
*e
,
830 struct strbuf path
= STRBUF_INIT
;
832 struct alternate_refs_data
*cb
= data
;
834 if (!strbuf_realpath(&path
, e
->path
, 0))
836 if (!strbuf_strip_suffix(&path
, "/objects"))
840 /* Is this a git repository with refs? */
841 strbuf_addstr(&path
, "/refs");
842 if (!is_directory(path
.buf
))
844 strbuf_setlen(&path
, base_len
);
846 read_alternate_refs(path
.buf
, cb
->fn
, cb
->data
);
849 strbuf_release(&path
);
853 void for_each_alternate_ref(alternate_ref_fn fn
, void *data
)
855 struct alternate_refs_data cb
;
858 foreach_alt_odb(refs_from_alternate_cb
, &cb
);
861 int foreach_alt_odb(alt_odb_fn fn
, void *cb
)
863 struct object_directory
*ent
;
866 prepare_alt_odb(the_repository
);
867 for (ent
= the_repository
->objects
->odb
->next
; ent
; ent
= ent
->next
) {
875 void prepare_alt_odb(struct repository
*r
)
877 if (r
->objects
->loaded_alternates
)
880 link_alt_odb_entries(r
, r
->objects
->alternate_db
, PATH_SEP
, NULL
, 0);
882 read_info_alternates(r
, r
->objects
->odb
->path
, 0);
883 r
->objects
->loaded_alternates
= 1;
886 /* Returns 1 if we have successfully freshened the file, 0 otherwise. */
887 static int freshen_file(const char *fn
)
890 t
.actime
= t
.modtime
= time(NULL
);
891 return !utime(fn
, &t
);
895 * All of the check_and_freshen functions return 1 if the file exists and was
896 * freshened (if freshening was requested), 0 otherwise. If they return
897 * 0, you should not assume that it is safe to skip a write of the object (it
898 * either does not exist on disk, or has a stale mtime and may be subject to
901 int check_and_freshen_file(const char *fn
, int freshen
)
903 if (access(fn
, F_OK
))
905 if (freshen
&& !freshen_file(fn
))
910 static int check_and_freshen_odb(struct object_directory
*odb
,
911 const struct object_id
*oid
,
914 static struct strbuf path
= STRBUF_INIT
;
915 odb_loose_path(odb
, &path
, oid
);
916 return check_and_freshen_file(path
.buf
, freshen
);
919 static int check_and_freshen_local(const struct object_id
*oid
, int freshen
)
921 return check_and_freshen_odb(the_repository
->objects
->odb
, oid
, freshen
);
924 static int check_and_freshen_nonlocal(const struct object_id
*oid
, int freshen
)
926 struct object_directory
*odb
;
928 prepare_alt_odb(the_repository
);
929 for (odb
= the_repository
->objects
->odb
->next
; odb
; odb
= odb
->next
) {
930 if (check_and_freshen_odb(odb
, oid
, freshen
))
936 static int check_and_freshen(const struct object_id
*oid
, int freshen
)
938 return check_and_freshen_local(oid
, freshen
) ||
939 check_and_freshen_nonlocal(oid
, freshen
);
942 int has_loose_object_nonlocal(const struct object_id
*oid
)
944 return check_and_freshen_nonlocal(oid
, 0);
947 static int has_loose_object(const struct object_id
*oid
)
949 return check_and_freshen(oid
, 0);
952 static void mmap_limit_check(size_t length
)
954 static size_t limit
= 0;
956 limit
= git_env_ulong("GIT_MMAP_LIMIT", 0);
961 die(_("attempting to mmap %"PRIuMAX
" over limit %"PRIuMAX
),
962 (uintmax_t)length
, (uintmax_t)limit
);
965 void *xmmap_gently(void *start
, size_t length
,
966 int prot
, int flags
, int fd
, off_t offset
)
970 mmap_limit_check(length
);
971 ret
= mmap(start
, length
, prot
, flags
, fd
, offset
);
972 if (ret
== MAP_FAILED
&& !length
)
977 void *xmmap(void *start
, size_t length
,
978 int prot
, int flags
, int fd
, off_t offset
)
980 void *ret
= xmmap_gently(start
, length
, prot
, flags
, fd
, offset
);
981 if (ret
== MAP_FAILED
)
982 die_errno(_("mmap failed"));
987 * With an in-core object data in "map", rehash it to make sure the
988 * object name actually matches "oid" to detect object corruption.
989 * With "map" == NULL, try reading the object named with "oid" using
990 * the streaming interface and rehash it to do the same.
992 int check_object_signature(struct repository
*r
, const struct object_id
*oid
,
993 void *map
, unsigned long size
, const char *type
)
995 struct object_id real_oid
;
996 enum object_type obj_type
;
997 struct git_istream
*st
;
999 char hdr
[MAX_HEADER_LEN
];
1003 hash_object_file(r
->hash_algo
, map
, size
, type
, &real_oid
);
1004 return !oideq(oid
, &real_oid
) ? -1 : 0;
1007 st
= open_istream(r
, oid
, &obj_type
, &size
, NULL
);
1011 /* Generate the header */
1012 hdrlen
= xsnprintf(hdr
, sizeof(hdr
), "%s %"PRIuMAX
, type_name(obj_type
), (uintmax_t)size
) + 1;
1015 r
->hash_algo
->init_fn(&c
);
1016 r
->hash_algo
->update_fn(&c
, hdr
, hdrlen
);
1018 char buf
[1024 * 16];
1019 ssize_t readlen
= read_istream(st
, buf
, sizeof(buf
));
1027 r
->hash_algo
->update_fn(&c
, buf
, readlen
);
1029 r
->hash_algo
->final_fn(real_oid
.hash
, &c
);
1031 return !oideq(oid
, &real_oid
) ? -1 : 0;
1034 int git_open_cloexec(const char *name
, int flags
)
1037 static int o_cloexec
= O_CLOEXEC
;
1039 fd
= open(name
, flags
| o_cloexec
);
1040 if ((o_cloexec
& O_CLOEXEC
) && fd
< 0 && errno
== EINVAL
) {
1041 /* Try again w/o O_CLOEXEC: the kernel might not support it */
1042 o_cloexec
&= ~O_CLOEXEC
;
1043 fd
= open(name
, flags
| o_cloexec
);
1046 #if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
1048 static int fd_cloexec
= FD_CLOEXEC
;
1050 if (!o_cloexec
&& 0 <= fd
&& fd_cloexec
) {
1051 /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
1052 int flags
= fcntl(fd
, F_GETFD
);
1053 if (fcntl(fd
, F_SETFD
, flags
| fd_cloexec
))
1062 * Find "oid" as a loose object in the local repository or in an alternate.
1063 * Returns 0 on success, negative on failure.
1065 * The "path" out-parameter will give the path of the object we found (if any).
1066 * Note that it may point to static storage and is only valid until another
1067 * call to stat_loose_object().
1069 static int stat_loose_object(struct repository
*r
, const struct object_id
*oid
,
1070 struct stat
*st
, const char **path
)
1072 struct object_directory
*odb
;
1073 static struct strbuf buf
= STRBUF_INIT
;
1076 for (odb
= r
->objects
->odb
; odb
; odb
= odb
->next
) {
1077 *path
= odb_loose_path(odb
, &buf
, oid
);
1078 if (!lstat(*path
, st
))
1086 * Like stat_loose_object(), but actually open the object and return the
1087 * descriptor. See the caveats on the "path" parameter above.
1089 static int open_loose_object(struct repository
*r
,
1090 const struct object_id
*oid
, const char **path
)
1093 struct object_directory
*odb
;
1094 int most_interesting_errno
= ENOENT
;
1095 static struct strbuf buf
= STRBUF_INIT
;
1098 for (odb
= r
->objects
->odb
; odb
; odb
= odb
->next
) {
1099 *path
= odb_loose_path(odb
, &buf
, oid
);
1100 fd
= git_open(*path
);
1104 if (most_interesting_errno
== ENOENT
)
1105 most_interesting_errno
= errno
;
1107 errno
= most_interesting_errno
;
1111 static int quick_has_loose(struct repository
*r
,
1112 const struct object_id
*oid
)
1114 struct object_directory
*odb
;
1117 for (odb
= r
->objects
->odb
; odb
; odb
= odb
->next
) {
1118 if (oid_array_lookup(odb_loose_cache(odb
, oid
), oid
) >= 0)
1125 * Map the loose object at "path" if it is not NULL, or the path found by
1126 * searching for a loose object named "oid".
1128 static void *map_loose_object_1(struct repository
*r
, const char *path
,
1129 const struct object_id
*oid
, unsigned long *size
)
1135 fd
= git_open(path
);
1137 fd
= open_loose_object(r
, oid
, &path
);
1142 if (!fstat(fd
, &st
)) {
1143 *size
= xsize_t(st
.st_size
);
1145 /* mmap() is forbidden on empty files */
1146 error(_("object file %s is empty"), path
);
1150 map
= xmmap(NULL
, *size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
1157 void *map_loose_object(struct repository
*r
,
1158 const struct object_id
*oid
,
1159 unsigned long *size
)
1161 return map_loose_object_1(r
, NULL
, oid
, size
);
1164 static int unpack_loose_short_header(git_zstream
*stream
,
1165 unsigned char *map
, unsigned long mapsize
,
1166 void *buffer
, unsigned long bufsiz
)
1170 /* Get the data stream */
1171 memset(stream
, 0, sizeof(*stream
));
1172 stream
->next_in
= map
;
1173 stream
->avail_in
= mapsize
;
1174 stream
->next_out
= buffer
;
1175 stream
->avail_out
= bufsiz
;
1177 git_inflate_init(stream
);
1179 ret
= git_inflate(stream
, 0);
1185 int unpack_loose_header(git_zstream
*stream
,
1186 unsigned char *map
, unsigned long mapsize
,
1187 void *buffer
, unsigned long bufsiz
)
1189 int status
= unpack_loose_short_header(stream
, map
, mapsize
,
1195 /* Make sure we have the terminating NUL */
1196 if (!memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
1201 static int unpack_loose_header_to_strbuf(git_zstream
*stream
, unsigned char *map
,
1202 unsigned long mapsize
, void *buffer
,
1203 unsigned long bufsiz
, struct strbuf
*header
)
1207 status
= unpack_loose_short_header(stream
, map
, mapsize
, buffer
, bufsiz
);
1212 * Check if entire header is unpacked in the first iteration.
1214 if (memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
1218 * buffer[0..bufsiz] was not large enough. Copy the partial
1219 * result out to header, and then append the result of further
1220 * reading the stream.
1222 strbuf_add(header
, buffer
, stream
->next_out
- (unsigned char *)buffer
);
1223 stream
->next_out
= buffer
;
1224 stream
->avail_out
= bufsiz
;
1228 status
= git_inflate(stream
, 0);
1230 strbuf_add(header
, buffer
, stream
->next_out
- (unsigned char *)buffer
);
1231 if (memchr(buffer
, '\0', stream
->next_out
- (unsigned char *)buffer
))
1233 stream
->next_out
= buffer
;
1234 stream
->avail_out
= bufsiz
;
1235 } while (status
!= Z_STREAM_END
);
1239 static void *unpack_loose_rest(git_zstream
*stream
,
1240 void *buffer
, unsigned long size
,
1241 const struct object_id
*oid
)
1243 int bytes
= strlen(buffer
) + 1;
1244 unsigned char *buf
= xmallocz(size
);
1248 n
= stream
->total_out
- bytes
;
1251 memcpy(buf
, (char *) buffer
+ bytes
, n
);
1253 if (bytes
<= size
) {
1255 * The above condition must be (bytes <= size), not
1256 * (bytes < size). In other words, even though we
1257 * expect no more output and set avail_out to zero,
1258 * the input zlib stream may have bytes that express
1259 * "this concludes the stream", and we *do* want to
1262 * Otherwise we would not be able to test that we
1263 * consumed all the input to reach the expected size;
1264 * we also want to check that zlib tells us that all
1265 * went well with status == Z_STREAM_END at the end.
1267 stream
->next_out
= buf
+ bytes
;
1268 stream
->avail_out
= size
- bytes
;
1269 while (status
== Z_OK
) {
1271 status
= git_inflate(stream
, Z_FINISH
);
1275 if (status
== Z_STREAM_END
&& !stream
->avail_in
) {
1276 git_inflate_end(stream
);
1281 error(_("corrupt loose object '%s'"), oid_to_hex(oid
));
1282 else if (stream
->avail_in
)
1283 error(_("garbage at end of loose object '%s'"),
1290 * We used to just use "sscanf()", but that's actually way
1291 * too permissive for what we want to check. So do an anal
1292 * object header parse by hand.
1294 static int parse_loose_header_extended(const char *hdr
, struct object_info
*oi
,
1297 const char *type_buf
= hdr
;
1299 int type
, type_len
= 0;
1302 * The type can be of any size but is followed by
1314 type
= type_from_string_gently(type_buf
, type_len
, 1);
1316 strbuf_add(oi
->type_name
, type_buf
, type_len
);
1318 * Set type to 0 if its an unknown object and
1319 * we're obtaining the type using '--allow-unknown-type'
1322 if ((flags
& OBJECT_INFO_ALLOW_UNKNOWN_TYPE
) && (type
< 0))
1325 die(_("invalid object type"));
1330 * The length must follow immediately, and be in canonical
1331 * decimal format (ie "010" is not valid).
1333 size
= *hdr
++ - '0';
1338 unsigned long c
= *hdr
- '0';
1342 size
= size
* 10 + c
;
1350 * The length must be followed by a zero byte
1352 return *hdr
? -1 : type
;
1355 int parse_loose_header(const char *hdr
, unsigned long *sizep
)
1357 struct object_info oi
= OBJECT_INFO_INIT
;
1360 return parse_loose_header_extended(hdr
, &oi
, 0);
1363 static int loose_object_info(struct repository
*r
,
1364 const struct object_id
*oid
,
1365 struct object_info
*oi
, int flags
)
1368 unsigned long mapsize
;
1371 char hdr
[MAX_HEADER_LEN
];
1372 struct strbuf hdrbuf
= STRBUF_INIT
;
1373 unsigned long size_scratch
;
1375 if (oi
->delta_base_sha1
)
1376 hashclr(oi
->delta_base_sha1
);
1379 * If we don't care about type or size, then we don't
1380 * need to look inside the object at all. Note that we
1381 * do not optimize out the stat call, even if the
1382 * caller doesn't care about the disk-size, since our
1383 * return value implicitly indicates whether the
1384 * object even exists.
1386 if (!oi
->typep
&& !oi
->type_name
&& !oi
->sizep
&& !oi
->contentp
) {
1389 if (!oi
->disk_sizep
&& (flags
& OBJECT_INFO_QUICK
))
1390 return quick_has_loose(r
, oid
) ? 0 : -1;
1391 if (stat_loose_object(r
, oid
, &st
, &path
) < 0)
1394 *oi
->disk_sizep
= st
.st_size
;
1398 map
= map_loose_object(r
, oid
, &mapsize
);
1403 oi
->sizep
= &size_scratch
;
1406 *oi
->disk_sizep
= mapsize
;
1407 if ((flags
& OBJECT_INFO_ALLOW_UNKNOWN_TYPE
)) {
1408 if (unpack_loose_header_to_strbuf(&stream
, map
, mapsize
, hdr
, sizeof(hdr
), &hdrbuf
) < 0)
1409 status
= error(_("unable to unpack %s header with --allow-unknown-type"),
1411 } else if (unpack_loose_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0)
1412 status
= error(_("unable to unpack %s header"),
1416 else if (hdrbuf
.len
) {
1417 if ((status
= parse_loose_header_extended(hdrbuf
.buf
, oi
, flags
)) < 0)
1418 status
= error(_("unable to parse %s header with --allow-unknown-type"),
1420 } else if ((status
= parse_loose_header_extended(hdr
, oi
, flags
)) < 0)
1421 status
= error(_("unable to parse %s header"), oid_to_hex(oid
));
1423 if (status
>= 0 && oi
->contentp
) {
1424 *oi
->contentp
= unpack_loose_rest(&stream
, hdr
,
1426 if (!*oi
->contentp
) {
1427 git_inflate_end(&stream
);
1431 git_inflate_end(&stream
);
1433 munmap(map
, mapsize
);
1434 if (status
&& oi
->typep
)
1435 *oi
->typep
= status
;
1436 if (oi
->sizep
== &size_scratch
)
1438 strbuf_release(&hdrbuf
);
1439 oi
->whence
= OI_LOOSE
;
1440 return (status
< 0) ? status
: 0;
1443 int obj_read_use_lock
= 0;
1444 pthread_mutex_t obj_read_mutex
;
1446 void enable_obj_read_lock(void)
1448 if (obj_read_use_lock
)
1451 obj_read_use_lock
= 1;
1452 init_recursive_mutex(&obj_read_mutex
);
1455 void disable_obj_read_lock(void)
1457 if (!obj_read_use_lock
)
1460 obj_read_use_lock
= 0;
1461 pthread_mutex_destroy(&obj_read_mutex
);
1464 int fetch_if_missing
= 1;
1466 static int do_oid_object_info_extended(struct repository
*r
,
1467 const struct object_id
*oid
,
1468 struct object_info
*oi
, unsigned flags
)
1470 static struct object_info blank_oi
= OBJECT_INFO_INIT
;
1471 struct cached_object
*co
;
1472 struct pack_entry e
;
1474 const struct object_id
*real
= oid
;
1475 int already_retried
= 0;
1478 if (flags
& OBJECT_INFO_LOOKUP_REPLACE
)
1479 real
= lookup_replace_object(r
, oid
);
1481 if (is_null_oid(real
))
1487 co
= find_cached_object(real
);
1490 *(oi
->typep
) = co
->type
;
1492 *(oi
->sizep
) = co
->size
;
1494 *(oi
->disk_sizep
) = 0;
1495 if (oi
->delta_base_sha1
)
1496 hashclr(oi
->delta_base_sha1
);
1498 strbuf_addstr(oi
->type_name
, type_name(co
->type
));
1500 *oi
->contentp
= xmemdupz(co
->buf
, co
->size
);
1501 oi
->whence
= OI_CACHED
;
1506 if (find_pack_entry(r
, real
, &e
))
1509 if (flags
& OBJECT_INFO_IGNORE_LOOSE
)
1512 /* Most likely it's a loose object. */
1513 if (!loose_object_info(r
, real
, oi
, flags
))
1516 /* Not a loose object; someone else may have just packed it. */
1517 if (!(flags
& OBJECT_INFO_QUICK
)) {
1518 reprepare_packed_git(r
);
1519 if (find_pack_entry(r
, real
, &e
))
1523 /* Check if it is a missing object */
1524 if (fetch_if_missing
&& has_promisor_remote() &&
1525 !already_retried
&& r
== the_repository
&&
1526 !(flags
& OBJECT_INFO_SKIP_FETCH_OBJECT
)) {
1528 * TODO Investigate checking promisor_remote_get_direct()
1529 * TODO return value and stopping on error here.
1530 * TODO Pass a repository struct through
1531 * promisor_remote_get_direct(), such that arbitrary
1532 * repositories work.
1534 promisor_remote_get_direct(r
, real
, 1);
1535 already_retried
= 1;
1542 if (oi
== &blank_oi
)
1544 * We know that the caller doesn't actually need the
1545 * information below, so return early.
1548 rtype
= packed_object_info(r
, e
.p
, e
.offset
, oi
);
1550 mark_bad_packed_object(e
.p
, real
->hash
);
1551 return do_oid_object_info_extended(r
, real
, oi
, 0);
1552 } else if (oi
->whence
== OI_PACKED
) {
1553 oi
->u
.packed
.offset
= e
.offset
;
1554 oi
->u
.packed
.pack
= e
.p
;
1555 oi
->u
.packed
.is_delta
= (rtype
== OBJ_REF_DELTA
||
1556 rtype
== OBJ_OFS_DELTA
);
1562 int oid_object_info_extended(struct repository
*r
, const struct object_id
*oid
,
1563 struct object_info
*oi
, unsigned flags
)
1567 ret
= do_oid_object_info_extended(r
, oid
, oi
, flags
);
1573 /* returns enum object_type or negative */
1574 int oid_object_info(struct repository
*r
,
1575 const struct object_id
*oid
,
1576 unsigned long *sizep
)
1578 enum object_type type
;
1579 struct object_info oi
= OBJECT_INFO_INIT
;
1583 if (oid_object_info_extended(r
, oid
, &oi
,
1584 OBJECT_INFO_LOOKUP_REPLACE
) < 0)
1589 static void *read_object(struct repository
*r
,
1590 const struct object_id
*oid
, enum object_type
*type
,
1591 unsigned long *size
)
1593 struct object_info oi
= OBJECT_INFO_INIT
;
1597 oi
.contentp
= &content
;
1599 if (oid_object_info_extended(r
, oid
, &oi
, 0) < 0)
1604 int pretend_object_file(void *buf
, unsigned long len
, enum object_type type
,
1605 struct object_id
*oid
)
1607 struct cached_object
*co
;
1609 hash_object_file(the_hash_algo
, buf
, len
, type_name(type
), oid
);
1610 if (has_object_file(oid
) || find_cached_object(oid
))
1612 ALLOC_GROW(cached_objects
, cached_object_nr
+ 1, cached_object_alloc
);
1613 co
= &cached_objects
[cached_object_nr
++];
1616 co
->buf
= xmalloc(len
);
1617 memcpy(co
->buf
, buf
, len
);
1618 oidcpy(&co
->oid
, oid
);
1623 * This function dies on corrupt objects; the callers who want to
1624 * deal with them should arrange to call read_object() and give error
1625 * messages themselves.
1627 void *read_object_file_extended(struct repository
*r
,
1628 const struct object_id
*oid
,
1629 enum object_type
*type
,
1630 unsigned long *size
,
1634 const struct packed_git
*p
;
1637 const struct object_id
*repl
= lookup_replace
?
1638 lookup_replace_object(r
, oid
) : oid
;
1641 data
= read_object(r
, repl
, type
, size
);
1646 if (errno
&& errno
!= ENOENT
)
1647 die_errno(_("failed to read object %s"), oid_to_hex(oid
));
1649 /* die if we replaced an object with one that does not exist */
1651 die(_("replacement %s not found for %s"),
1652 oid_to_hex(repl
), oid_to_hex(oid
));
1654 if (!stat_loose_object(r
, repl
, &st
, &path
))
1655 die(_("loose object %s (stored in %s) is corrupt"),
1656 oid_to_hex(repl
), path
);
1658 if ((p
= has_packed_and_bad(r
, repl
->hash
)) != NULL
)
1659 die(_("packed object %s (stored in %s) is corrupt"),
1660 oid_to_hex(repl
), p
->pack_name
);
1666 void *read_object_with_reference(struct repository
*r
,
1667 const struct object_id
*oid
,
1668 const char *required_type_name
,
1669 unsigned long *size
,
1670 struct object_id
*actual_oid_return
)
1672 enum object_type type
, required_type
;
1674 unsigned long isize
;
1675 struct object_id actual_oid
;
1677 required_type
= type_from_string(required_type_name
);
1678 oidcpy(&actual_oid
, oid
);
1680 int ref_length
= -1;
1681 const char *ref_type
= NULL
;
1683 buffer
= repo_read_object_file(r
, &actual_oid
, &type
, &isize
);
1686 if (type
== required_type
) {
1688 if (actual_oid_return
)
1689 oidcpy(actual_oid_return
, &actual_oid
);
1692 /* Handle references */
1693 else if (type
== OBJ_COMMIT
)
1695 else if (type
== OBJ_TAG
)
1696 ref_type
= "object ";
1701 ref_length
= strlen(ref_type
);
1703 if (ref_length
+ the_hash_algo
->hexsz
> isize
||
1704 memcmp(buffer
, ref_type
, ref_length
) ||
1705 get_oid_hex((char *) buffer
+ ref_length
, &actual_oid
)) {
1710 /* Now we have the ID of the referred-to object in
1711 * actual_oid. Check again. */
1715 static void write_object_file_prepare(const struct git_hash_algo
*algo
,
1716 const void *buf
, unsigned long len
,
1717 const char *type
, struct object_id
*oid
,
1718 char *hdr
, int *hdrlen
)
1722 /* Generate the header */
1723 *hdrlen
= xsnprintf(hdr
, *hdrlen
, "%s %"PRIuMAX
, type
, (uintmax_t)len
)+1;
1727 algo
->update_fn(&c
, hdr
, *hdrlen
);
1728 algo
->update_fn(&c
, buf
, len
);
1729 algo
->final_fn(oid
->hash
, &c
);
1733 * Move the just written object into its final resting place.
1735 int finalize_object_file(const char *tmpfile
, const char *filename
)
1739 if (object_creation_mode
== OBJECT_CREATION_USES_RENAMES
)
1741 else if (link(tmpfile
, filename
))
1745 * Coda hack - coda doesn't like cross-directory links,
1746 * so we fall back to a rename, which will mean that it
1747 * won't be able to check collisions, but that's not a
1750 * The same holds for FAT formatted media.
1752 * When this succeeds, we just return. We have nothing
1755 if (ret
&& ret
!= EEXIST
) {
1757 if (!rename(tmpfile
, filename
))
1761 unlink_or_warn(tmpfile
);
1763 if (ret
!= EEXIST
) {
1764 return error_errno(_("unable to write file %s"), filename
);
1766 /* FIXME!!! Collision check here ? */
1770 if (adjust_shared_perm(filename
))
1771 return error(_("unable to set permission to '%s'"), filename
);
1775 static int write_buffer(int fd
, const void *buf
, size_t len
)
1777 if (write_in_full(fd
, buf
, len
) < 0)
1778 return error_errno(_("file write error"));
1782 int hash_object_file(const struct git_hash_algo
*algo
, const void *buf
,
1783 unsigned long len
, const char *type
,
1784 struct object_id
*oid
)
1786 char hdr
[MAX_HEADER_LEN
];
1787 int hdrlen
= sizeof(hdr
);
1788 write_object_file_prepare(algo
, buf
, len
, type
, oid
, hdr
, &hdrlen
);
1792 /* Finalize a file on disk, and close it. */
1793 static void close_loose_object(int fd
)
1795 if (fsync_object_files
)
1796 fsync_or_die(fd
, "loose object file");
1798 die_errno(_("error when closing loose object file"));
1801 /* Size of directory component, including the ending '/' */
1802 static inline int directory_size(const char *filename
)
1804 const char *s
= strrchr(filename
, '/');
1807 return s
- filename
+ 1;
1811 * This creates a temporary file in the same directory as the final
1814 * We want to avoid cross-directory filename renames, because those
1815 * can have problems on various filesystems (FAT, NFS, Coda).
1817 static int create_tmpfile(struct strbuf
*tmp
, const char *filename
)
1819 int fd
, dirlen
= directory_size(filename
);
1822 strbuf_add(tmp
, filename
, dirlen
);
1823 strbuf_addstr(tmp
, "tmp_obj_XXXXXX");
1824 fd
= git_mkstemp_mode(tmp
->buf
, 0444);
1825 if (fd
< 0 && dirlen
&& errno
== ENOENT
) {
1827 * Make sure the directory exists; note that the contents
1828 * of the buffer are undefined after mkstemp returns an
1829 * error, so we have to rewrite the whole buffer from
1833 strbuf_add(tmp
, filename
, dirlen
- 1);
1834 if (mkdir(tmp
->buf
, 0777) && errno
!= EEXIST
)
1836 if (adjust_shared_perm(tmp
->buf
))
1840 strbuf_addstr(tmp
, "/tmp_obj_XXXXXX");
1841 fd
= git_mkstemp_mode(tmp
->buf
, 0444);
1846 static int write_loose_object(const struct object_id
*oid
, char *hdr
,
1847 int hdrlen
, const void *buf
, unsigned long len
,
1851 unsigned char compressed
[4096];
1854 struct object_id parano_oid
;
1855 static struct strbuf tmp_file
= STRBUF_INIT
;
1856 static struct strbuf filename
= STRBUF_INIT
;
1858 loose_object_path(the_repository
, &filename
, oid
);
1860 fd
= create_tmpfile(&tmp_file
, filename
.buf
);
1862 if (errno
== EACCES
)
1863 return error(_("insufficient permission for adding an object to repository database %s"), get_object_directory());
1865 return error_errno(_("unable to create temporary file"));
1869 git_deflate_init(&stream
, zlib_compression_level
);
1870 stream
.next_out
= compressed
;
1871 stream
.avail_out
= sizeof(compressed
);
1872 the_hash_algo
->init_fn(&c
);
1874 /* First header.. */
1875 stream
.next_in
= (unsigned char *)hdr
;
1876 stream
.avail_in
= hdrlen
;
1877 while (git_deflate(&stream
, 0) == Z_OK
)
1879 the_hash_algo
->update_fn(&c
, hdr
, hdrlen
);
1881 /* Then the data itself.. */
1882 stream
.next_in
= (void *)buf
;
1883 stream
.avail_in
= len
;
1885 unsigned char *in0
= stream
.next_in
;
1886 ret
= git_deflate(&stream
, Z_FINISH
);
1887 the_hash_algo
->update_fn(&c
, in0
, stream
.next_in
- in0
);
1888 if (write_buffer(fd
, compressed
, stream
.next_out
- compressed
) < 0)
1889 die(_("unable to write loose object file"));
1890 stream
.next_out
= compressed
;
1891 stream
.avail_out
= sizeof(compressed
);
1892 } while (ret
== Z_OK
);
1894 if (ret
!= Z_STREAM_END
)
1895 die(_("unable to deflate new object %s (%d)"), oid_to_hex(oid
),
1897 ret
= git_deflate_end_gently(&stream
);
1899 die(_("deflateEnd on object %s failed (%d)"), oid_to_hex(oid
),
1901 the_hash_algo
->final_fn(parano_oid
.hash
, &c
);
1902 if (!oideq(oid
, ¶no_oid
))
1903 die(_("confused by unstable object source data for %s"),
1906 close_loose_object(fd
);
1911 utb
.modtime
= mtime
;
1912 if (utime(tmp_file
.buf
, &utb
) < 0)
1913 warning_errno(_("failed utime() on %s"), tmp_file
.buf
);
1916 return finalize_object_file(tmp_file
.buf
, filename
.buf
);
1919 static int freshen_loose_object(const struct object_id
*oid
)
1921 return check_and_freshen(oid
, 1);
1924 static int freshen_packed_object(const struct object_id
*oid
)
1926 struct pack_entry e
;
1927 if (!find_pack_entry(the_repository
, oid
, &e
))
1931 if (!freshen_file(e
.p
->pack_name
))
1937 int write_object_file(const void *buf
, unsigned long len
, const char *type
,
1938 struct object_id
*oid
)
1940 char hdr
[MAX_HEADER_LEN
];
1941 int hdrlen
= sizeof(hdr
);
1943 /* Normally if we have it in the pack then we do not bother writing
1944 * it out into .git/objects/??/?{38} file.
1946 write_object_file_prepare(the_hash_algo
, buf
, len
, type
, oid
, hdr
,
1948 if (freshen_packed_object(oid
) || freshen_loose_object(oid
))
1950 return write_loose_object(oid
, hdr
, hdrlen
, buf
, len
, 0);
1953 int hash_object_file_literally(const void *buf
, unsigned long len
,
1954 const char *type
, struct object_id
*oid
,
1958 int hdrlen
, status
= 0;
1960 /* type string, SP, %lu of the length plus NUL must fit this */
1961 hdrlen
= strlen(type
) + MAX_HEADER_LEN
;
1962 header
= xmalloc(hdrlen
);
1963 write_object_file_prepare(the_hash_algo
, buf
, len
, type
, oid
, header
,
1966 if (!(flags
& HASH_WRITE_OBJECT
))
1968 if (freshen_packed_object(oid
) || freshen_loose_object(oid
))
1970 status
= write_loose_object(oid
, header
, hdrlen
, buf
, len
, 0);
1977 int force_object_loose(const struct object_id
*oid
, time_t mtime
)
1981 enum object_type type
;
1982 char hdr
[MAX_HEADER_LEN
];
1986 if (has_loose_object(oid
))
1988 buf
= read_object(the_repository
, oid
, &type
, &len
);
1990 return error(_("cannot read object for %s"), oid_to_hex(oid
));
1991 hdrlen
= xsnprintf(hdr
, sizeof(hdr
), "%s %"PRIuMAX
, type_name(type
), (uintmax_t)len
) + 1;
1992 ret
= write_loose_object(oid
, hdr
, hdrlen
, buf
, len
, mtime
);
1998 int repo_has_object_file_with_flags(struct repository
*r
,
1999 const struct object_id
*oid
, int flags
)
2001 if (!startup_info
->have_repository
)
2003 return oid_object_info_extended(r
, oid
, NULL
, flags
) >= 0;
2006 int repo_has_object_file(struct repository
*r
,
2007 const struct object_id
*oid
)
2009 return repo_has_object_file_with_flags(r
, oid
, 0);
2012 static void check_tree(const void *buf
, size_t size
)
2014 struct tree_desc desc
;
2015 struct name_entry entry
;
2017 init_tree_desc(&desc
, buf
, size
);
2018 while (tree_entry(&desc
, &entry
))
2020 * tree_entry() will die() on malformed entries */
2024 static void check_commit(const void *buf
, size_t size
)
2027 memset(&c
, 0, sizeof(c
));
2028 if (parse_commit_buffer(the_repository
, &c
, buf
, size
, 0))
2029 die(_("corrupt commit"));
2032 static void check_tag(const void *buf
, size_t size
)
2035 memset(&t
, 0, sizeof(t
));
2036 if (parse_tag_buffer(the_repository
, &t
, buf
, size
))
2037 die(_("corrupt tag"));
2040 static int index_mem(struct index_state
*istate
,
2041 struct object_id
*oid
, void *buf
, size_t size
,
2042 enum object_type type
,
2043 const char *path
, unsigned flags
)
2045 int ret
, re_allocated
= 0;
2046 int write_object
= flags
& HASH_WRITE_OBJECT
;
2052 * Convert blobs to git internal format
2054 if ((type
== OBJ_BLOB
) && path
) {
2055 struct strbuf nbuf
= STRBUF_INIT
;
2056 if (convert_to_git(istate
, path
, buf
, size
, &nbuf
,
2057 get_conv_flags(flags
))) {
2058 buf
= strbuf_detach(&nbuf
, &size
);
2062 if (flags
& HASH_FORMAT_CHECK
) {
2063 if (type
== OBJ_TREE
)
2064 check_tree(buf
, size
);
2065 if (type
== OBJ_COMMIT
)
2066 check_commit(buf
, size
);
2067 if (type
== OBJ_TAG
)
2068 check_tag(buf
, size
);
2072 ret
= write_object_file(buf
, size
, type_name(type
), oid
);
2074 ret
= hash_object_file(the_hash_algo
, buf
, size
,
2075 type_name(type
), oid
);
2081 static int index_stream_convert_blob(struct index_state
*istate
,
2082 struct object_id
*oid
,
2088 const int write_object
= flags
& HASH_WRITE_OBJECT
;
2089 struct strbuf sbuf
= STRBUF_INIT
;
2092 assert(would_convert_to_git_filter_fd(istate
, path
));
2094 convert_to_git_filter_fd(istate
, path
, fd
, &sbuf
,
2095 get_conv_flags(flags
));
2098 ret
= write_object_file(sbuf
.buf
, sbuf
.len
, type_name(OBJ_BLOB
),
2101 ret
= hash_object_file(the_hash_algo
, sbuf
.buf
, sbuf
.len
,
2102 type_name(OBJ_BLOB
), oid
);
2103 strbuf_release(&sbuf
);
2107 static int index_pipe(struct index_state
*istate
, struct object_id
*oid
,
2108 int fd
, enum object_type type
,
2109 const char *path
, unsigned flags
)
2111 struct strbuf sbuf
= STRBUF_INIT
;
2114 if (strbuf_read(&sbuf
, fd
, 4096) >= 0)
2115 ret
= index_mem(istate
, oid
, sbuf
.buf
, sbuf
.len
, type
, path
, flags
);
2118 strbuf_release(&sbuf
);
2122 #define SMALL_FILE_SIZE (32*1024)
2124 static int index_core(struct index_state
*istate
,
2125 struct object_id
*oid
, int fd
, size_t size
,
2126 enum object_type type
, const char *path
,
2132 ret
= index_mem(istate
, oid
, "", size
, type
, path
, flags
);
2133 } else if (size
<= SMALL_FILE_SIZE
) {
2134 char *buf
= xmalloc(size
);
2135 ssize_t read_result
= read_in_full(fd
, buf
, size
);
2136 if (read_result
< 0)
2137 ret
= error_errno(_("read error while indexing %s"),
2138 path
? path
: "<unknown>");
2139 else if (read_result
!= size
)
2140 ret
= error(_("short read while indexing %s"),
2141 path
? path
: "<unknown>");
2143 ret
= index_mem(istate
, oid
, buf
, size
, type
, path
, flags
);
2146 void *buf
= xmmap(NULL
, size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
2147 ret
= index_mem(istate
, oid
, buf
, size
, type
, path
, flags
);
2154 * This creates one packfile per large blob unless bulk-checkin
2155 * machinery is "plugged".
2157 * This also bypasses the usual "convert-to-git" dance, and that is on
2158 * purpose. We could write a streaming version of the converting
2159 * functions and insert that before feeding the data to fast-import
2160 * (or equivalent in-core API described above). However, that is
2161 * somewhat complicated, as we do not know the size of the filter
2162 * result, which we need to know beforehand when writing a git object.
2163 * Since the primary motivation for trying to stream from the working
2164 * tree file and to avoid mmaping it in core is to deal with large
2165 * binary blobs, they generally do not want to get any conversion, and
2166 * callers should avoid this code path when filters are requested.
2168 static int index_stream(struct object_id
*oid
, int fd
, size_t size
,
2169 enum object_type type
, const char *path
,
2172 return index_bulk_checkin(oid
, fd
, size
, type
, path
, flags
);
2175 int index_fd(struct index_state
*istate
, struct object_id
*oid
,
2176 int fd
, struct stat
*st
,
2177 enum object_type type
, const char *path
, unsigned flags
)
2182 * Call xsize_t() only when needed to avoid potentially unnecessary
2183 * die() for large files.
2185 if (type
== OBJ_BLOB
&& path
&& would_convert_to_git_filter_fd(istate
, path
))
2186 ret
= index_stream_convert_blob(istate
, oid
, fd
, path
, flags
);
2187 else if (!S_ISREG(st
->st_mode
))
2188 ret
= index_pipe(istate
, oid
, fd
, type
, path
, flags
);
2189 else if (st
->st_size
<= big_file_threshold
|| type
!= OBJ_BLOB
||
2190 (path
&& would_convert_to_git(istate
, path
)))
2191 ret
= index_core(istate
, oid
, fd
, xsize_t(st
->st_size
),
2194 ret
= index_stream(oid
, fd
, xsize_t(st
->st_size
), type
, path
,
2200 int index_path(struct index_state
*istate
, struct object_id
*oid
,
2201 const char *path
, struct stat
*st
, unsigned flags
)
2204 struct strbuf sb
= STRBUF_INIT
;
2207 switch (st
->st_mode
& S_IFMT
) {
2209 fd
= open(path
, O_RDONLY
);
2211 return error_errno("open(\"%s\")", path
);
2212 if (index_fd(istate
, oid
, fd
, st
, OBJ_BLOB
, path
, flags
) < 0)
2213 return error(_("%s: failed to insert into database"),
2217 if (strbuf_readlink(&sb
, path
, st
->st_size
))
2218 return error_errno("readlink(\"%s\")", path
);
2219 if (!(flags
& HASH_WRITE_OBJECT
))
2220 hash_object_file(the_hash_algo
, sb
.buf
, sb
.len
,
2222 else if (write_object_file(sb
.buf
, sb
.len
, blob_type
, oid
))
2223 rc
= error(_("%s: failed to insert into database"), path
);
2224 strbuf_release(&sb
);
2227 return resolve_gitlink_ref(path
, "HEAD", oid
);
2229 return error(_("%s: unsupported file type"), path
);
2234 int read_pack_header(int fd
, struct pack_header
*header
)
2236 if (read_in_full(fd
, header
, sizeof(*header
)) != sizeof(*header
))
2237 /* "eof before pack header was fully read" */
2238 return PH_ERROR_EOF
;
2240 if (header
->hdr_signature
!= htonl(PACK_SIGNATURE
))
2241 /* "protocol error (pack signature mismatch detected)" */
2242 return PH_ERROR_PACK_SIGNATURE
;
2243 if (!pack_version_ok(header
->hdr_version
))
2244 /* "protocol error (pack version unsupported)" */
2245 return PH_ERROR_PROTOCOL
;
2249 void assert_oid_type(const struct object_id
*oid
, enum object_type expect
)
2251 enum object_type type
= oid_object_info(the_repository
, oid
, NULL
);
2253 die(_("%s is not a valid object"), oid_to_hex(oid
));
2255 die(_("%s is not a valid '%s' object"), oid_to_hex(oid
),
2259 int for_each_file_in_obj_subdir(unsigned int subdir_nr
,
2260 struct strbuf
*path
,
2261 each_loose_object_fn obj_cb
,
2262 each_loose_cruft_fn cruft_cb
,
2263 each_loose_subdir_fn subdir_cb
,
2266 size_t origlen
, baselen
;
2270 struct object_id oid
;
2272 if (subdir_nr
> 0xff)
2273 BUG("invalid loose object subdirectory: %x", subdir_nr
);
2275 origlen
= path
->len
;
2276 strbuf_complete(path
, '/');
2277 strbuf_addf(path
, "%02x", subdir_nr
);
2279 dir
= opendir(path
->buf
);
2281 if (errno
!= ENOENT
)
2282 r
= error_errno(_("unable to open %s"), path
->buf
);
2283 strbuf_setlen(path
, origlen
);
2287 oid
.hash
[0] = subdir_nr
;
2288 strbuf_addch(path
, '/');
2289 baselen
= path
->len
;
2291 while ((de
= readdir(dir
))) {
2293 if (is_dot_or_dotdot(de
->d_name
))
2296 namelen
= strlen(de
->d_name
);
2297 strbuf_setlen(path
, baselen
);
2298 strbuf_add(path
, de
->d_name
, namelen
);
2299 if (namelen
== the_hash_algo
->hexsz
- 2 &&
2300 !hex_to_bytes(oid
.hash
+ 1, de
->d_name
,
2301 the_hash_algo
->rawsz
- 1)) {
2303 r
= obj_cb(&oid
, path
->buf
, data
);
2311 r
= cruft_cb(de
->d_name
, path
->buf
, data
);
2318 strbuf_setlen(path
, baselen
- 1);
2319 if (!r
&& subdir_cb
)
2320 r
= subdir_cb(subdir_nr
, path
->buf
, data
);
2322 strbuf_setlen(path
, origlen
);
2327 int for_each_loose_file_in_objdir_buf(struct strbuf
*path
,
2328 each_loose_object_fn obj_cb
,
2329 each_loose_cruft_fn cruft_cb
,
2330 each_loose_subdir_fn subdir_cb
,
2336 for (i
= 0; i
< 256; i
++) {
2337 r
= for_each_file_in_obj_subdir(i
, path
, obj_cb
, cruft_cb
,
2346 int for_each_loose_file_in_objdir(const char *path
,
2347 each_loose_object_fn obj_cb
,
2348 each_loose_cruft_fn cruft_cb
,
2349 each_loose_subdir_fn subdir_cb
,
2352 struct strbuf buf
= STRBUF_INIT
;
2355 strbuf_addstr(&buf
, path
);
2356 r
= for_each_loose_file_in_objdir_buf(&buf
, obj_cb
, cruft_cb
,
2358 strbuf_release(&buf
);
2363 int for_each_loose_object(each_loose_object_fn cb
, void *data
,
2364 enum for_each_object_flags flags
)
2366 struct object_directory
*odb
;
2368 prepare_alt_odb(the_repository
);
2369 for (odb
= the_repository
->objects
->odb
; odb
; odb
= odb
->next
) {
2370 int r
= for_each_loose_file_in_objdir(odb
->path
, cb
, NULL
,
2375 if (flags
& FOR_EACH_OBJECT_LOCAL_ONLY
)
2382 static int append_loose_object(const struct object_id
*oid
, const char *path
,
2385 oid_array_append(data
, oid
);
2389 struct oid_array
*odb_loose_cache(struct object_directory
*odb
,
2390 const struct object_id
*oid
)
2392 int subdir_nr
= oid
->hash
[0];
2393 struct strbuf buf
= STRBUF_INIT
;
2395 if (subdir_nr
< 0 ||
2396 subdir_nr
>= ARRAY_SIZE(odb
->loose_objects_subdir_seen
))
2397 BUG("subdir_nr out of range");
2399 if (odb
->loose_objects_subdir_seen
[subdir_nr
])
2400 return &odb
->loose_objects_cache
[subdir_nr
];
2402 strbuf_addstr(&buf
, odb
->path
);
2403 for_each_file_in_obj_subdir(subdir_nr
, &buf
,
2404 append_loose_object
,
2406 &odb
->loose_objects_cache
[subdir_nr
]);
2407 odb
->loose_objects_subdir_seen
[subdir_nr
] = 1;
2408 strbuf_release(&buf
);
2409 return &odb
->loose_objects_cache
[subdir_nr
];
2412 void odb_clear_loose_cache(struct object_directory
*odb
)
2416 for (i
= 0; i
< ARRAY_SIZE(odb
->loose_objects_cache
); i
++)
2417 oid_array_clear(&odb
->loose_objects_cache
[i
]);
2418 memset(&odb
->loose_objects_subdir_seen
, 0,
2419 sizeof(odb
->loose_objects_subdir_seen
));
2422 static int check_stream_oid(git_zstream
*stream
,
2426 const struct object_id
*expected_oid
)
2429 struct object_id real_oid
;
2430 unsigned char buf
[4096];
2431 unsigned long total_read
;
2434 the_hash_algo
->init_fn(&c
);
2435 the_hash_algo
->update_fn(&c
, hdr
, stream
->total_out
);
2438 * We already read some bytes into hdr, but the ones up to the NUL
2439 * do not count against the object's content size.
2441 total_read
= stream
->total_out
- strlen(hdr
) - 1;
2444 * This size comparison must be "<=" to read the final zlib packets;
2445 * see the comment in unpack_loose_rest for details.
2447 while (total_read
<= size
&&
2449 (status
== Z_BUF_ERROR
&& !stream
->avail_out
))) {
2450 stream
->next_out
= buf
;
2451 stream
->avail_out
= sizeof(buf
);
2452 if (size
- total_read
< stream
->avail_out
)
2453 stream
->avail_out
= size
- total_read
;
2454 status
= git_inflate(stream
, Z_FINISH
);
2455 the_hash_algo
->update_fn(&c
, buf
, stream
->next_out
- buf
);
2456 total_read
+= stream
->next_out
- buf
;
2458 git_inflate_end(stream
);
2460 if (status
!= Z_STREAM_END
) {
2461 error(_("corrupt loose object '%s'"), oid_to_hex(expected_oid
));
2464 if (stream
->avail_in
) {
2465 error(_("garbage at end of loose object '%s'"),
2466 oid_to_hex(expected_oid
));
2470 the_hash_algo
->final_fn(real_oid
.hash
, &c
);
2471 if (!oideq(expected_oid
, &real_oid
)) {
2472 error(_("hash mismatch for %s (expected %s)"), path
,
2473 oid_to_hex(expected_oid
));
2480 int read_loose_object(const char *path
,
2481 const struct object_id
*expected_oid
,
2482 enum object_type
*type
,
2483 unsigned long *size
,
2488 unsigned long mapsize
;
2490 char hdr
[MAX_HEADER_LEN
];
2494 map
= map_loose_object_1(the_repository
, path
, NULL
, &mapsize
);
2496 error_errno(_("unable to mmap %s"), path
);
2500 if (unpack_loose_header(&stream
, map
, mapsize
, hdr
, sizeof(hdr
)) < 0) {
2501 error(_("unable to unpack header of %s"), path
);
2505 *type
= parse_loose_header(hdr
, size
);
2507 error(_("unable to parse header of %s"), path
);
2508 git_inflate_end(&stream
);
2512 if (*type
== OBJ_BLOB
&& *size
> big_file_threshold
) {
2513 if (check_stream_oid(&stream
, hdr
, *size
, path
, expected_oid
) < 0)
2516 *contents
= unpack_loose_rest(&stream
, hdr
, *size
, expected_oid
);
2518 error(_("unable to unpack contents of %s"), path
);
2519 git_inflate_end(&stream
);
2522 if (check_object_signature(the_repository
, expected_oid
,
2524 type_name(*type
))) {
2525 error(_("hash mismatch for %s (expected %s)"), path
,
2526 oid_to_hex(expected_oid
));
2532 ret
= 0; /* everything checks out */
2536 munmap(map
, mapsize
);