3 #include "refs-internal.h"
5 #include "../iterator.h"
6 #include "../dir-iterator.h"
7 #include "../lockfile.h"
14 struct object_id old_oid
;
18 * Return true if refname, which has the specified oid and flags, can
19 * be resolved to an object in the database. If the referred-to object
20 * does not exist, emit a warning and return false.
22 static int ref_resolves_to_object(const char *refname
,
23 const struct object_id
*oid
,
26 if (flags
& REF_ISBROKEN
)
28 if (!has_sha1_file(oid
->hash
)) {
29 error("%s does not point to a valid object!", refname
);
35 struct packed_ref_cache
{
36 struct ref_cache
*cache
;
39 * Count of references to the data structure in this instance,
40 * including the pointer from files_ref_store::packed if any.
41 * The data will not be freed as long as the reference count
44 unsigned int referrers
;
46 /* The metadata from when this packed-refs cache was read */
47 struct stat_validity validity
;
51 * Future: need to be in "struct repository"
52 * when doing a full libification.
54 struct files_ref_store
{
55 struct ref_store base
;
56 unsigned int store_flags
;
60 char *packed_refs_path
;
62 struct ref_cache
*loose
;
63 struct packed_ref_cache
*packed
;
66 * Iff the packed-refs file associated with this instance is
67 * currently locked for writing, this points at the associated
68 * lock (which is owned by somebody else).
70 struct lock_file
*packed_refs_lock
;
73 /* Lock used for the main packed-refs file: */
74 static struct lock_file packlock
;
77 * Increment the reference count of *packed_refs.
79 static void acquire_packed_ref_cache(struct packed_ref_cache
*packed_refs
)
81 packed_refs
->referrers
++;
85 * Decrease the reference count of *packed_refs. If it goes to zero,
86 * free *packed_refs and return true; otherwise return false.
88 static int release_packed_ref_cache(struct packed_ref_cache
*packed_refs
)
90 if (!--packed_refs
->referrers
) {
91 free_ref_cache(packed_refs
->cache
);
92 stat_validity_clear(&packed_refs
->validity
);
100 static void clear_packed_ref_cache(struct files_ref_store
*refs
)
103 struct packed_ref_cache
*packed_refs
= refs
->packed
;
105 if (refs
->packed_refs_lock
)
106 die("BUG: packed-ref cache cleared while locked");
108 release_packed_ref_cache(packed_refs
);
112 static void clear_loose_ref_cache(struct files_ref_store
*refs
)
115 free_ref_cache(refs
->loose
);
121 * Create a new submodule ref cache and add it to the internal
124 static struct ref_store
*files_ref_store_create(const char *gitdir
,
127 struct files_ref_store
*refs
= xcalloc(1, sizeof(*refs
));
128 struct ref_store
*ref_store
= (struct ref_store
*)refs
;
129 struct strbuf sb
= STRBUF_INIT
;
131 base_ref_store_init(ref_store
, &refs_be_files
);
132 refs
->store_flags
= flags
;
134 refs
->gitdir
= xstrdup(gitdir
);
135 get_common_dir_noenv(&sb
, gitdir
);
136 refs
->gitcommondir
= strbuf_detach(&sb
, NULL
);
137 strbuf_addf(&sb
, "%s/packed-refs", refs
->gitcommondir
);
138 refs
->packed_refs_path
= strbuf_detach(&sb
, NULL
);
144 * Die if refs is not the main ref store. caller is used in any
145 * necessary error messages.
147 static void files_assert_main_repository(struct files_ref_store
*refs
,
150 if (refs
->store_flags
& REF_STORE_MAIN
)
153 die("BUG: operation %s only allowed for main ref store", caller
);
157 * Downcast ref_store to files_ref_store. Die if ref_store is not a
158 * files_ref_store. required_flags is compared with ref_store's
159 * store_flags to ensure the ref_store has all required capabilities.
160 * "caller" is used in any necessary error messages.
162 static struct files_ref_store
*files_downcast(struct ref_store
*ref_store
,
163 unsigned int required_flags
,
166 struct files_ref_store
*refs
;
168 if (ref_store
->be
!= &refs_be_files
)
169 die("BUG: ref_store is type \"%s\" not \"files\" in %s",
170 ref_store
->be
->name
, caller
);
172 refs
= (struct files_ref_store
*)ref_store
;
174 if ((refs
->store_flags
& required_flags
) != required_flags
)
175 die("BUG: operation %s requires abilities 0x%x, but only have 0x%x",
176 caller
, required_flags
, refs
->store_flags
);
181 /* The length of a peeled reference line in packed-refs, including EOL: */
182 #define PEELED_LINE_LENGTH 42
185 * The packed-refs header line that we write out. Perhaps other
186 * traits will be added later. The trailing space is required.
188 static const char PACKED_REFS_HEADER
[] =
189 "# pack-refs with: peeled fully-peeled \n";
192 * Parse one line from a packed-refs file. Write the SHA1 to sha1.
193 * Return a pointer to the refname within the line (null-terminated),
194 * or NULL if there was a problem.
196 static const char *parse_ref_line(struct strbuf
*line
, struct object_id
*oid
)
200 if (parse_oid_hex(line
->buf
, oid
, &ref
) < 0)
202 if (!isspace(*ref
++))
208 if (line
->buf
[line
->len
- 1] != '\n')
210 line
->buf
[--line
->len
] = 0;
216 * Read f, which is a packed-refs file, into dir.
218 * A comment line of the form "# pack-refs with: " may contain zero or
219 * more traits. We interpret the traits as follows:
223 * Probably no references are peeled. But if the file contains a
224 * peeled value for a reference, we will use it.
228 * References under "refs/tags/", if they *can* be peeled, *are*
229 * peeled in this file. References outside of "refs/tags/" are
230 * probably not peeled even if they could have been, but if we find
231 * a peeled value for such a reference we will use it.
235 * All references in the file that can be peeled are peeled.
236 * Inversely (and this is more important), any references in the
237 * file for which no peeled value is recorded is not peelable. This
238 * trait should typically be written alongside "peeled" for
239 * compatibility with older clients, but we do not require it
240 * (i.e., "peeled" is a no-op if "fully-peeled" is set).
242 static void read_packed_refs(FILE *f
, struct ref_dir
*dir
)
244 struct ref_entry
*last
= NULL
;
245 struct strbuf line
= STRBUF_INIT
;
246 enum { PEELED_NONE
, PEELED_TAGS
, PEELED_FULLY
} peeled
= PEELED_NONE
;
248 while (strbuf_getwholeline(&line
, f
, '\n') != EOF
) {
249 struct object_id oid
;
253 if (skip_prefix(line
.buf
, "# pack-refs with:", &traits
)) {
254 if (strstr(traits
, " fully-peeled "))
255 peeled
= PEELED_FULLY
;
256 else if (strstr(traits
, " peeled "))
257 peeled
= PEELED_TAGS
;
258 /* perhaps other traits later as well */
262 refname
= parse_ref_line(&line
, &oid
);
264 int flag
= REF_ISPACKED
;
266 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
)) {
267 if (!refname_is_safe(refname
))
268 die("packed refname is dangerous: %s", refname
);
270 flag
|= REF_BAD_NAME
| REF_ISBROKEN
;
272 last
= create_ref_entry(refname
, &oid
, flag
, 0);
273 if (peeled
== PEELED_FULLY
||
274 (peeled
== PEELED_TAGS
&& starts_with(refname
, "refs/tags/")))
275 last
->flag
|= REF_KNOWS_PEELED
;
276 add_ref_entry(dir
, last
);
280 line
.buf
[0] == '^' &&
281 line
.len
== PEELED_LINE_LENGTH
&&
282 line
.buf
[PEELED_LINE_LENGTH
- 1] == '\n' &&
283 !get_oid_hex(line
.buf
+ 1, &oid
)) {
284 oidcpy(&last
->u
.value
.peeled
, &oid
);
286 * Regardless of what the file header said,
287 * we definitely know the value of *this*
290 last
->flag
|= REF_KNOWS_PEELED
;
294 strbuf_release(&line
);
297 static const char *files_packed_refs_path(struct files_ref_store
*refs
)
299 return refs
->packed_refs_path
;
302 static void files_reflog_path(struct files_ref_store
*refs
,
308 * FIXME: of course this is wrong in multi worktree
309 * setting. To be fixed real soon.
311 strbuf_addf(sb
, "%s/logs", refs
->gitcommondir
);
315 switch (ref_type(refname
)) {
316 case REF_TYPE_PER_WORKTREE
:
317 case REF_TYPE_PSEUDOREF
:
318 strbuf_addf(sb
, "%s/logs/%s", refs
->gitdir
, refname
);
320 case REF_TYPE_NORMAL
:
321 strbuf_addf(sb
, "%s/logs/%s", refs
->gitcommondir
, refname
);
324 die("BUG: unknown ref type %d of ref %s",
325 ref_type(refname
), refname
);
329 static void files_ref_path(struct files_ref_store
*refs
,
333 switch (ref_type(refname
)) {
334 case REF_TYPE_PER_WORKTREE
:
335 case REF_TYPE_PSEUDOREF
:
336 strbuf_addf(sb
, "%s/%s", refs
->gitdir
, refname
);
338 case REF_TYPE_NORMAL
:
339 strbuf_addf(sb
, "%s/%s", refs
->gitcommondir
, refname
);
342 die("BUG: unknown ref type %d of ref %s",
343 ref_type(refname
), refname
);
348 * Get the packed_ref_cache for the specified files_ref_store,
349 * creating it if necessary.
351 static struct packed_ref_cache
*get_packed_ref_cache(struct files_ref_store
*refs
)
353 const char *packed_refs_file
= files_packed_refs_path(refs
);
356 !stat_validity_check(&refs
->packed
->validity
, packed_refs_file
))
357 clear_packed_ref_cache(refs
);
362 refs
->packed
= xcalloc(1, sizeof(*refs
->packed
));
363 acquire_packed_ref_cache(refs
->packed
);
364 refs
->packed
->cache
= create_ref_cache(&refs
->base
, NULL
);
365 refs
->packed
->cache
->root
->flag
&= ~REF_INCOMPLETE
;
366 f
= fopen(packed_refs_file
, "r");
368 stat_validity_update(&refs
->packed
->validity
, fileno(f
));
369 read_packed_refs(f
, get_ref_dir(refs
->packed
->cache
->root
));
376 static struct ref_dir
*get_packed_ref_dir(struct packed_ref_cache
*packed_ref_cache
)
378 return get_ref_dir(packed_ref_cache
->cache
->root
);
381 static struct ref_dir
*get_packed_refs(struct files_ref_store
*refs
)
383 return get_packed_ref_dir(get_packed_ref_cache(refs
));
387 * Add a reference to the in-memory packed reference cache. This may
388 * only be called while the packed-refs file is locked (see
389 * lock_packed_refs()). To actually write the packed-refs file, call
390 * commit_packed_refs().
392 static void add_packed_ref(struct files_ref_store
*refs
,
393 const char *refname
, const struct object_id
*oid
)
395 struct packed_ref_cache
*packed_ref_cache
= get_packed_ref_cache(refs
);
397 if (!refs
->packed_refs_lock
)
398 die("BUG: packed refs not locked");
399 add_ref_entry(get_packed_ref_dir(packed_ref_cache
),
400 create_ref_entry(refname
, oid
, REF_ISPACKED
, 1));
404 * Read the loose references from the namespace dirname into dir
405 * (without recursing). dirname must end with '/'. dir must be the
406 * directory entry corresponding to dirname.
408 static void loose_fill_ref_dir(struct ref_store
*ref_store
,
409 struct ref_dir
*dir
, const char *dirname
)
411 struct files_ref_store
*refs
=
412 files_downcast(ref_store
, REF_STORE_READ
, "fill_ref_dir");
415 int dirnamelen
= strlen(dirname
);
416 struct strbuf refname
;
417 struct strbuf path
= STRBUF_INIT
;
420 files_ref_path(refs
, &path
, dirname
);
421 path_baselen
= path
.len
;
423 d
= opendir(path
.buf
);
425 strbuf_release(&path
);
429 strbuf_init(&refname
, dirnamelen
+ 257);
430 strbuf_add(&refname
, dirname
, dirnamelen
);
432 while ((de
= readdir(d
)) != NULL
) {
433 struct object_id oid
;
437 if (de
->d_name
[0] == '.')
439 if (ends_with(de
->d_name
, ".lock"))
441 strbuf_addstr(&refname
, de
->d_name
);
442 strbuf_addstr(&path
, de
->d_name
);
443 if (stat(path
.buf
, &st
) < 0) {
444 ; /* silently ignore */
445 } else if (S_ISDIR(st
.st_mode
)) {
446 strbuf_addch(&refname
, '/');
447 add_entry_to_dir(dir
,
448 create_dir_entry(dir
->cache
, refname
.buf
,
451 if (!refs_resolve_ref_unsafe(&refs
->base
,
456 flag
|= REF_ISBROKEN
;
457 } else if (is_null_oid(&oid
)) {
459 * It is so astronomically unlikely
460 * that NULL_SHA1 is the SHA-1 of an
461 * actual object that we consider its
462 * appearance in a loose reference
463 * file to be repo corruption
464 * (probably due to a software bug).
466 flag
|= REF_ISBROKEN
;
469 if (check_refname_format(refname
.buf
,
470 REFNAME_ALLOW_ONELEVEL
)) {
471 if (!refname_is_safe(refname
.buf
))
472 die("loose refname is dangerous: %s", refname
.buf
);
474 flag
|= REF_BAD_NAME
| REF_ISBROKEN
;
476 add_entry_to_dir(dir
,
477 create_ref_entry(refname
.buf
, &oid
, flag
, 0));
479 strbuf_setlen(&refname
, dirnamelen
);
480 strbuf_setlen(&path
, path_baselen
);
482 strbuf_release(&refname
);
483 strbuf_release(&path
);
487 * Manually add refs/bisect, which, being per-worktree, might
488 * not appear in the directory listing for refs/ in the main
491 if (!strcmp(dirname
, "refs/")) {
492 int pos
= search_ref_dir(dir
, "refs/bisect/", 12);
495 struct ref_entry
*child_entry
= create_dir_entry(
496 dir
->cache
, "refs/bisect/", 12, 1);
497 add_entry_to_dir(dir
, child_entry
);
502 static struct ref_cache
*get_loose_ref_cache(struct files_ref_store
*refs
)
506 * Mark the top-level directory complete because we
507 * are about to read the only subdirectory that can
510 refs
->loose
= create_ref_cache(&refs
->base
, loose_fill_ref_dir
);
512 /* We're going to fill the top level ourselves: */
513 refs
->loose
->root
->flag
&= ~REF_INCOMPLETE
;
516 * Add an incomplete entry for "refs/" (to be filled
519 add_entry_to_dir(get_ref_dir(refs
->loose
->root
),
520 create_dir_entry(refs
->loose
, "refs/", 5, 1));
526 * Return the ref_entry for the given refname from the packed
527 * references. If it does not exist, return NULL.
529 static struct ref_entry
*get_packed_ref(struct files_ref_store
*refs
,
532 return find_ref_entry(get_packed_refs(refs
), refname
);
536 * A loose ref file doesn't exist; check for a packed ref.
538 static int resolve_packed_ref(struct files_ref_store
*refs
,
540 unsigned char *sha1
, unsigned int *flags
)
542 struct ref_entry
*entry
;
545 * The loose reference file does not exist; check for a packed
548 entry
= get_packed_ref(refs
, refname
);
550 hashcpy(sha1
, entry
->u
.value
.oid
.hash
);
551 *flags
|= REF_ISPACKED
;
554 /* refname is not a packed reference. */
558 static int files_read_raw_ref(struct ref_store
*ref_store
,
559 const char *refname
, unsigned char *sha1
,
560 struct strbuf
*referent
, unsigned int *type
)
562 struct files_ref_store
*refs
=
563 files_downcast(ref_store
, REF_STORE_READ
, "read_raw_ref");
564 struct strbuf sb_contents
= STRBUF_INIT
;
565 struct strbuf sb_path
= STRBUF_INIT
;
572 int remaining_retries
= 3;
575 strbuf_reset(&sb_path
);
577 files_ref_path(refs
, &sb_path
, refname
);
583 * We might have to loop back here to avoid a race
584 * condition: first we lstat() the file, then we try
585 * to read it as a link or as a file. But if somebody
586 * changes the type of the file (file <-> directory
587 * <-> symlink) between the lstat() and reading, then
588 * we don't want to report that as an error but rather
589 * try again starting with the lstat().
591 * We'll keep a count of the retries, though, just to avoid
592 * any confusing situation sending us into an infinite loop.
595 if (remaining_retries
-- <= 0)
598 if (lstat(path
, &st
) < 0) {
601 if (resolve_packed_ref(refs
, refname
, sha1
, type
)) {
609 /* Follow "normalized" - ie "refs/.." symlinks by hand */
610 if (S_ISLNK(st
.st_mode
)) {
611 strbuf_reset(&sb_contents
);
612 if (strbuf_readlink(&sb_contents
, path
, 0) < 0) {
613 if (errno
== ENOENT
|| errno
== EINVAL
)
614 /* inconsistent with lstat; retry */
619 if (starts_with(sb_contents
.buf
, "refs/") &&
620 !check_refname_format(sb_contents
.buf
, 0)) {
621 strbuf_swap(&sb_contents
, referent
);
622 *type
|= REF_ISSYMREF
;
627 * It doesn't look like a refname; fall through to just
628 * treating it like a non-symlink, and reading whatever it
633 /* Is it a directory? */
634 if (S_ISDIR(st
.st_mode
)) {
636 * Even though there is a directory where the loose
637 * ref is supposed to be, there could still be a
640 if (resolve_packed_ref(refs
, refname
, sha1
, type
)) {
649 * Anything else, just open it and try to use it as
652 fd
= open(path
, O_RDONLY
);
654 if (errno
== ENOENT
&& !S_ISLNK(st
.st_mode
))
655 /* inconsistent with lstat; retry */
660 strbuf_reset(&sb_contents
);
661 if (strbuf_read(&sb_contents
, fd
, 256) < 0) {
662 int save_errno
= errno
;
668 strbuf_rtrim(&sb_contents
);
669 buf
= sb_contents
.buf
;
670 if (starts_with(buf
, "ref:")) {
672 while (isspace(*buf
))
675 strbuf_reset(referent
);
676 strbuf_addstr(referent
, buf
);
677 *type
|= REF_ISSYMREF
;
683 * Please note that FETCH_HEAD has additional
684 * data after the sha.
686 if (get_sha1_hex(buf
, sha1
) ||
687 (buf
[40] != '\0' && !isspace(buf
[40]))) {
688 *type
|= REF_ISBROKEN
;
697 strbuf_release(&sb_path
);
698 strbuf_release(&sb_contents
);
703 static void unlock_ref(struct ref_lock
*lock
)
705 /* Do not free lock->lk -- atexit() still looks at them */
707 rollback_lock_file(lock
->lk
);
708 free(lock
->ref_name
);
713 * Lock refname, without following symrefs, and set *lock_p to point
714 * at a newly-allocated lock object. Fill in lock->old_oid, referent,
715 * and type similarly to read_raw_ref().
717 * The caller must verify that refname is a "safe" reference name (in
718 * the sense of refname_is_safe()) before calling this function.
720 * If the reference doesn't already exist, verify that refname doesn't
721 * have a D/F conflict with any existing references. extras and skip
722 * are passed to refs_verify_refname_available() for this check.
724 * If mustexist is not set and the reference is not found or is
725 * broken, lock the reference anyway but clear sha1.
727 * Return 0 on success. On failure, write an error message to err and
728 * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR.
730 * Implementation note: This function is basically
735 * but it includes a lot more code to
736 * - Deal with possible races with other processes
737 * - Avoid calling refs_verify_refname_available() when it can be
738 * avoided, namely if we were successfully able to read the ref
739 * - Generate informative error messages in the case of failure
741 static int lock_raw_ref(struct files_ref_store
*refs
,
742 const char *refname
, int mustexist
,
743 const struct string_list
*extras
,
744 const struct string_list
*skip
,
745 struct ref_lock
**lock_p
,
746 struct strbuf
*referent
,
750 struct ref_lock
*lock
;
751 struct strbuf ref_file
= STRBUF_INIT
;
752 int attempts_remaining
= 3;
753 int ret
= TRANSACTION_GENERIC_ERROR
;
756 files_assert_main_repository(refs
, "lock_raw_ref");
760 /* First lock the file so it can't change out from under us. */
762 *lock_p
= lock
= xcalloc(1, sizeof(*lock
));
764 lock
->ref_name
= xstrdup(refname
);
765 files_ref_path(refs
, &ref_file
, refname
);
768 switch (safe_create_leading_directories(ref_file
.buf
)) {
773 * Suppose refname is "refs/foo/bar". We just failed
774 * to create the containing directory, "refs/foo",
775 * because there was a non-directory in the way. This
776 * indicates a D/F conflict, probably because of
777 * another reference such as "refs/foo". There is no
778 * reason to expect this error to be transitory.
780 if (refs_verify_refname_available(&refs
->base
, refname
,
781 extras
, skip
, err
)) {
784 * To the user the relevant error is
785 * that the "mustexist" reference is
789 strbuf_addf(err
, "unable to resolve reference '%s'",
793 * The error message set by
794 * refs_verify_refname_available() is
797 ret
= TRANSACTION_NAME_CONFLICT
;
801 * The file that is in the way isn't a loose
802 * reference. Report it as a low-level
805 strbuf_addf(err
, "unable to create lock file %s.lock; "
806 "non-directory in the way",
811 /* Maybe another process was tidying up. Try again. */
812 if (--attempts_remaining
> 0)
816 strbuf_addf(err
, "unable to create directory for %s",
822 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
824 if (hold_lock_file_for_update(lock
->lk
, ref_file
.buf
, LOCK_NO_DEREF
) < 0) {
825 if (errno
== ENOENT
&& --attempts_remaining
> 0) {
827 * Maybe somebody just deleted one of the
828 * directories leading to ref_file. Try
833 unable_to_lock_message(ref_file
.buf
, errno
, err
);
839 * Now we hold the lock and can read the reference without
840 * fear that its value will change.
843 if (files_read_raw_ref(&refs
->base
, refname
,
844 lock
->old_oid
.hash
, referent
, type
)) {
845 if (errno
== ENOENT
) {
847 /* Garden variety missing reference. */
848 strbuf_addf(err
, "unable to resolve reference '%s'",
853 * Reference is missing, but that's OK. We
854 * know that there is not a conflict with
855 * another loose reference because
856 * (supposing that we are trying to lock
857 * reference "refs/foo/bar"):
859 * - We were successfully able to create
860 * the lockfile refs/foo/bar.lock, so we
861 * know there cannot be a loose reference
864 * - We got ENOENT and not EISDIR, so we
865 * know that there cannot be a loose
866 * reference named "refs/foo/bar/baz".
869 } else if (errno
== EISDIR
) {
871 * There is a directory in the way. It might have
872 * contained references that have been deleted. If
873 * we don't require that the reference already
874 * exists, try to remove the directory so that it
875 * doesn't cause trouble when we want to rename the
876 * lockfile into place later.
879 /* Garden variety missing reference. */
880 strbuf_addf(err
, "unable to resolve reference '%s'",
883 } else if (remove_dir_recursively(&ref_file
,
884 REMOVE_DIR_EMPTY_ONLY
)) {
885 if (refs_verify_refname_available(
886 &refs
->base
, refname
,
887 extras
, skip
, err
)) {
889 * The error message set by
890 * verify_refname_available() is OK.
892 ret
= TRANSACTION_NAME_CONFLICT
;
896 * We can't delete the directory,
897 * but we also don't know of any
898 * references that it should
901 strbuf_addf(err
, "there is a non-empty directory '%s' "
902 "blocking reference '%s'",
903 ref_file
.buf
, refname
);
907 } else if (errno
== EINVAL
&& (*type
& REF_ISBROKEN
)) {
908 strbuf_addf(err
, "unable to resolve reference '%s': "
909 "reference broken", refname
);
912 strbuf_addf(err
, "unable to resolve reference '%s': %s",
913 refname
, strerror(errno
));
918 * If the ref did not exist and we are creating it,
919 * make sure there is no existing ref that conflicts
922 if (refs_verify_refname_available(
923 &refs
->base
, refname
,
936 strbuf_release(&ref_file
);
940 static int files_peel_ref(struct ref_store
*ref_store
,
941 const char *refname
, unsigned char *sha1
)
943 struct files_ref_store
*refs
=
944 files_downcast(ref_store
, REF_STORE_READ
| REF_STORE_ODB
,
947 unsigned char base
[20];
949 if (current_ref_iter
&& current_ref_iter
->refname
== refname
) {
950 struct object_id peeled
;
952 if (ref_iterator_peel(current_ref_iter
, &peeled
))
954 hashcpy(sha1
, peeled
.hash
);
958 if (refs_read_ref_full(ref_store
, refname
,
959 RESOLVE_REF_READING
, base
, &flag
))
963 * If the reference is packed, read its ref_entry from the
964 * cache in the hope that we already know its peeled value.
965 * We only try this optimization on packed references because
966 * (a) forcing the filling of the loose reference cache could
967 * be expensive and (b) loose references anyway usually do not
968 * have REF_KNOWS_PEELED.
970 if (flag
& REF_ISPACKED
) {
971 struct ref_entry
*r
= get_packed_ref(refs
, refname
);
973 if (peel_entry(r
, 0))
975 hashcpy(sha1
, r
->u
.value
.peeled
.hash
);
980 return peel_object(base
, sha1
);
983 struct files_ref_iterator
{
984 struct ref_iterator base
;
986 struct packed_ref_cache
*packed_ref_cache
;
987 struct ref_iterator
*iter0
;
991 static int files_ref_iterator_advance(struct ref_iterator
*ref_iterator
)
993 struct files_ref_iterator
*iter
=
994 (struct files_ref_iterator
*)ref_iterator
;
997 while ((ok
= ref_iterator_advance(iter
->iter0
)) == ITER_OK
) {
998 if (iter
->flags
& DO_FOR_EACH_PER_WORKTREE_ONLY
&&
999 ref_type(iter
->iter0
->refname
) != REF_TYPE_PER_WORKTREE
)
1002 if (!(iter
->flags
& DO_FOR_EACH_INCLUDE_BROKEN
) &&
1003 !ref_resolves_to_object(iter
->iter0
->refname
,
1005 iter
->iter0
->flags
))
1008 iter
->base
.refname
= iter
->iter0
->refname
;
1009 iter
->base
.oid
= iter
->iter0
->oid
;
1010 iter
->base
.flags
= iter
->iter0
->flags
;
1015 if (ref_iterator_abort(ref_iterator
) != ITER_DONE
)
1021 static int files_ref_iterator_peel(struct ref_iterator
*ref_iterator
,
1022 struct object_id
*peeled
)
1024 struct files_ref_iterator
*iter
=
1025 (struct files_ref_iterator
*)ref_iterator
;
1027 return ref_iterator_peel(iter
->iter0
, peeled
);
1030 static int files_ref_iterator_abort(struct ref_iterator
*ref_iterator
)
1032 struct files_ref_iterator
*iter
=
1033 (struct files_ref_iterator
*)ref_iterator
;
1037 ok
= ref_iterator_abort(iter
->iter0
);
1039 release_packed_ref_cache(iter
->packed_ref_cache
);
1040 base_ref_iterator_free(ref_iterator
);
1044 static struct ref_iterator_vtable files_ref_iterator_vtable
= {
1045 files_ref_iterator_advance
,
1046 files_ref_iterator_peel
,
1047 files_ref_iterator_abort
1050 static struct ref_iterator
*files_ref_iterator_begin(
1051 struct ref_store
*ref_store
,
1052 const char *prefix
, unsigned int flags
)
1054 struct files_ref_store
*refs
;
1055 struct ref_iterator
*loose_iter
, *packed_iter
;
1056 struct files_ref_iterator
*iter
;
1057 struct ref_iterator
*ref_iterator
;
1059 if (ref_paranoia
< 0)
1060 ref_paranoia
= git_env_bool("GIT_REF_PARANOIA", 0);
1062 flags
|= DO_FOR_EACH_INCLUDE_BROKEN
;
1064 refs
= files_downcast(ref_store
,
1065 REF_STORE_READ
| (ref_paranoia
? 0 : REF_STORE_ODB
),
1066 "ref_iterator_begin");
1068 iter
= xcalloc(1, sizeof(*iter
));
1069 ref_iterator
= &iter
->base
;
1070 base_ref_iterator_init(ref_iterator
, &files_ref_iterator_vtable
);
1073 * We must make sure that all loose refs are read before
1074 * accessing the packed-refs file; this avoids a race
1075 * condition if loose refs are migrated to the packed-refs
1076 * file by a simultaneous process, but our in-memory view is
1077 * from before the migration. We ensure this as follows:
1078 * First, we call start the loose refs iteration with its
1079 * `prime_ref` argument set to true. This causes the loose
1080 * references in the subtree to be pre-read into the cache.
1081 * (If they've already been read, that's OK; we only need to
1082 * guarantee that they're read before the packed refs, not
1083 * *how much* before.) After that, we call
1084 * get_packed_ref_cache(), which internally checks whether the
1085 * packed-ref cache is up to date with what is on disk, and
1086 * re-reads it if not.
1089 loose_iter
= cache_ref_iterator_begin(get_loose_ref_cache(refs
),
1092 iter
->packed_ref_cache
= get_packed_ref_cache(refs
);
1093 acquire_packed_ref_cache(iter
->packed_ref_cache
);
1094 packed_iter
= cache_ref_iterator_begin(iter
->packed_ref_cache
->cache
,
1097 iter
->iter0
= overlay_ref_iterator_begin(loose_iter
, packed_iter
);
1098 iter
->flags
= flags
;
1100 return ref_iterator
;
1104 * Verify that the reference locked by lock has the value old_sha1.
1105 * Fail if the reference doesn't exist and mustexist is set. Return 0
1106 * on success. On error, write an error message to err, set errno, and
1107 * return a negative value.
1109 static int verify_lock(struct ref_store
*ref_store
, struct ref_lock
*lock
,
1110 const unsigned char *old_sha1
, int mustexist
,
1115 if (refs_read_ref_full(ref_store
, lock
->ref_name
,
1116 mustexist
? RESOLVE_REF_READING
: 0,
1117 lock
->old_oid
.hash
, NULL
)) {
1119 int save_errno
= errno
;
1120 strbuf_addf(err
, "can't verify ref '%s'", lock
->ref_name
);
1124 oidclr(&lock
->old_oid
);
1128 if (old_sha1
&& hashcmp(lock
->old_oid
.hash
, old_sha1
)) {
1129 strbuf_addf(err
, "ref '%s' is at %s but expected %s",
1131 oid_to_hex(&lock
->old_oid
),
1132 sha1_to_hex(old_sha1
));
1139 static int remove_empty_directories(struct strbuf
*path
)
1142 * we want to create a file but there is a directory there;
1143 * if that is an empty directory (or a directory that contains
1144 * only empty directories), remove them.
1146 return remove_dir_recursively(path
, REMOVE_DIR_EMPTY_ONLY
);
1149 static int create_reflock(const char *path
, void *cb
)
1151 struct lock_file
*lk
= cb
;
1153 return hold_lock_file_for_update(lk
, path
, LOCK_NO_DEREF
) < 0 ? -1 : 0;
1157 * Locks a ref returning the lock on success and NULL on failure.
1158 * On failure errno is set to something meaningful.
1160 static struct ref_lock
*lock_ref_sha1_basic(struct files_ref_store
*refs
,
1161 const char *refname
,
1162 const unsigned char *old_sha1
,
1163 const struct string_list
*extras
,
1164 const struct string_list
*skip
,
1165 unsigned int flags
, int *type
,
1168 struct strbuf ref_file
= STRBUF_INIT
;
1169 struct ref_lock
*lock
;
1171 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1172 int resolve_flags
= RESOLVE_REF_NO_RECURSE
;
1175 files_assert_main_repository(refs
, "lock_ref_sha1_basic");
1178 lock
= xcalloc(1, sizeof(struct ref_lock
));
1181 resolve_flags
|= RESOLVE_REF_READING
;
1182 if (flags
& REF_DELETING
)
1183 resolve_flags
|= RESOLVE_REF_ALLOW_BAD_NAME
;
1185 files_ref_path(refs
, &ref_file
, refname
);
1186 resolved
= !!refs_resolve_ref_unsafe(&refs
->base
,
1187 refname
, resolve_flags
,
1188 lock
->old_oid
.hash
, type
);
1189 if (!resolved
&& errno
== EISDIR
) {
1191 * we are trying to lock foo but we used to
1192 * have foo/bar which now does not exist;
1193 * it is normal for the empty directory 'foo'
1196 if (remove_empty_directories(&ref_file
)) {
1198 if (!refs_verify_refname_available(
1200 refname
, extras
, skip
, err
))
1201 strbuf_addf(err
, "there are still refs under '%s'",
1205 resolved
= !!refs_resolve_ref_unsafe(&refs
->base
,
1206 refname
, resolve_flags
,
1207 lock
->old_oid
.hash
, type
);
1211 if (last_errno
!= ENOTDIR
||
1212 !refs_verify_refname_available(&refs
->base
, refname
,
1214 strbuf_addf(err
, "unable to resolve reference '%s': %s",
1215 refname
, strerror(last_errno
));
1221 * If the ref did not exist and we are creating it, make sure
1222 * there is no existing packed ref whose name begins with our
1223 * refname, nor a packed ref whose name is a proper prefix of
1226 if (is_null_oid(&lock
->old_oid
) &&
1227 refs_verify_refname_available(&refs
->base
, refname
,
1228 extras
, skip
, err
)) {
1229 last_errno
= ENOTDIR
;
1233 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1235 lock
->ref_name
= xstrdup(refname
);
1237 if (raceproof_create_file(ref_file
.buf
, create_reflock
, lock
->lk
)) {
1239 unable_to_lock_message(ref_file
.buf
, errno
, err
);
1243 if (verify_lock(&refs
->base
, lock
, old_sha1
, mustexist
, err
)) {
1254 strbuf_release(&ref_file
);
1260 * Write an entry to the packed-refs file for the specified refname.
1261 * If peeled is non-NULL, write it as the entry's peeled value.
1263 static void write_packed_entry(FILE *fh
, const char *refname
,
1264 const unsigned char *sha1
,
1265 const unsigned char *peeled
)
1267 fprintf_or_die(fh
, "%s %s\n", sha1_to_hex(sha1
), refname
);
1269 fprintf_or_die(fh
, "^%s\n", sha1_to_hex(peeled
));
1273 * Lock the packed-refs file for writing. Flags is passed to
1274 * hold_lock_file_for_update(). Return 0 on success. On errors, set
1275 * errno appropriately and return a nonzero value.
1277 static int lock_packed_refs(struct files_ref_store
*refs
, int flags
)
1279 static int timeout_configured
= 0;
1280 static int timeout_value
= 1000;
1281 struct packed_ref_cache
*packed_ref_cache
;
1283 files_assert_main_repository(refs
, "lock_packed_refs");
1285 if (!timeout_configured
) {
1286 git_config_get_int("core.packedrefstimeout", &timeout_value
);
1287 timeout_configured
= 1;
1290 if (hold_lock_file_for_update_timeout(
1291 &packlock
, files_packed_refs_path(refs
),
1292 flags
, timeout_value
) < 0)
1295 * Get the current packed-refs while holding the lock. If the
1296 * packed-refs file has been modified since we last read it,
1297 * this will automatically invalidate the cache and re-read
1298 * the packed-refs file.
1300 packed_ref_cache
= get_packed_ref_cache(refs
);
1301 refs
->packed_refs_lock
= &packlock
;
1302 /* Increment the reference count to prevent it from being freed: */
1303 acquire_packed_ref_cache(packed_ref_cache
);
1308 * Write the current version of the packed refs cache from memory to
1309 * disk. The packed-refs file must already be locked for writing (see
1310 * lock_packed_refs()). Return zero on success. On errors, set errno
1311 * and return a nonzero value
1313 static int commit_packed_refs(struct files_ref_store
*refs
)
1315 struct packed_ref_cache
*packed_ref_cache
=
1316 get_packed_ref_cache(refs
);
1320 struct ref_iterator
*iter
;
1322 files_assert_main_repository(refs
, "commit_packed_refs");
1324 if (!refs
->packed_refs_lock
)
1325 die("BUG: packed-refs not locked");
1327 out
= fdopen_lock_file(refs
->packed_refs_lock
, "w");
1329 die_errno("unable to fdopen packed-refs descriptor");
1331 fprintf_or_die(out
, "%s", PACKED_REFS_HEADER
);
1333 iter
= cache_ref_iterator_begin(packed_ref_cache
->cache
, NULL
, 0);
1334 while ((ok
= ref_iterator_advance(iter
)) == ITER_OK
) {
1335 struct object_id peeled
;
1336 int peel_error
= ref_iterator_peel(iter
, &peeled
);
1338 write_packed_entry(out
, iter
->refname
, iter
->oid
->hash
,
1339 peel_error
? NULL
: peeled
.hash
);
1342 if (ok
!= ITER_DONE
)
1343 die("error while iterating over references");
1345 if (commit_lock_file(refs
->packed_refs_lock
)) {
1349 refs
->packed_refs_lock
= NULL
;
1350 release_packed_ref_cache(packed_ref_cache
);
1356 * Rollback the lockfile for the packed-refs file, and discard the
1357 * in-memory packed reference cache. (The packed-refs file will be
1358 * read anew if it is needed again after this function is called.)
1360 static void rollback_packed_refs(struct files_ref_store
*refs
)
1362 struct packed_ref_cache
*packed_ref_cache
=
1363 get_packed_ref_cache(refs
);
1365 files_assert_main_repository(refs
, "rollback_packed_refs");
1367 if (!refs
->packed_refs_lock
)
1368 die("BUG: packed-refs not locked");
1369 rollback_lock_file(refs
->packed_refs_lock
);
1370 refs
->packed_refs_lock
= NULL
;
1371 release_packed_ref_cache(packed_ref_cache
);
1372 clear_packed_ref_cache(refs
);
1375 struct ref_to_prune
{
1376 struct ref_to_prune
*next
;
1377 unsigned char sha1
[20];
1378 char name
[FLEX_ARRAY
];
1382 REMOVE_EMPTY_PARENTS_REF
= 0x01,
1383 REMOVE_EMPTY_PARENTS_REFLOG
= 0x02
1387 * Remove empty parent directories associated with the specified
1388 * reference and/or its reflog, but spare [logs/]refs/ and immediate
1389 * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or
1390 * REMOVE_EMPTY_PARENTS_REFLOG.
1392 static void try_remove_empty_parents(struct files_ref_store
*refs
,
1393 const char *refname
,
1396 struct strbuf buf
= STRBUF_INIT
;
1397 struct strbuf sb
= STRBUF_INIT
;
1401 strbuf_addstr(&buf
, refname
);
1403 for (i
= 0; i
< 2; i
++) { /* refs/{heads,tags,...}/ */
1404 while (*p
&& *p
!= '/')
1406 /* tolerate duplicate slashes; see check_refname_format() */
1410 q
= buf
.buf
+ buf
.len
;
1411 while (flags
& (REMOVE_EMPTY_PARENTS_REF
| REMOVE_EMPTY_PARENTS_REFLOG
)) {
1412 while (q
> p
&& *q
!= '/')
1414 while (q
> p
&& *(q
-1) == '/')
1418 strbuf_setlen(&buf
, q
- buf
.buf
);
1421 files_ref_path(refs
, &sb
, buf
.buf
);
1422 if ((flags
& REMOVE_EMPTY_PARENTS_REF
) && rmdir(sb
.buf
))
1423 flags
&= ~REMOVE_EMPTY_PARENTS_REF
;
1426 files_reflog_path(refs
, &sb
, buf
.buf
);
1427 if ((flags
& REMOVE_EMPTY_PARENTS_REFLOG
) && rmdir(sb
.buf
))
1428 flags
&= ~REMOVE_EMPTY_PARENTS_REFLOG
;
1430 strbuf_release(&buf
);
1431 strbuf_release(&sb
);
1434 /* make sure nobody touched the ref, and unlink */
1435 static void prune_ref(struct files_ref_store
*refs
, struct ref_to_prune
*r
)
1437 struct ref_transaction
*transaction
;
1438 struct strbuf err
= STRBUF_INIT
;
1440 if (check_refname_format(r
->name
, 0))
1443 transaction
= ref_store_transaction_begin(&refs
->base
, &err
);
1445 ref_transaction_delete(transaction
, r
->name
, r
->sha1
,
1446 REF_ISPRUNING
| REF_NODEREF
, NULL
, &err
) ||
1447 ref_transaction_commit(transaction
, &err
)) {
1448 ref_transaction_free(transaction
);
1449 error("%s", err
.buf
);
1450 strbuf_release(&err
);
1453 ref_transaction_free(transaction
);
1454 strbuf_release(&err
);
1457 static void prune_refs(struct files_ref_store
*refs
, struct ref_to_prune
*r
)
1465 static int files_pack_refs(struct ref_store
*ref_store
, unsigned int flags
)
1467 struct files_ref_store
*refs
=
1468 files_downcast(ref_store
, REF_STORE_WRITE
| REF_STORE_ODB
,
1470 struct ref_iterator
*iter
;
1471 struct ref_dir
*packed_refs
;
1473 struct ref_to_prune
*refs_to_prune
= NULL
;
1475 lock_packed_refs(refs
, LOCK_DIE_ON_ERROR
);
1476 packed_refs
= get_packed_refs(refs
);
1478 iter
= cache_ref_iterator_begin(get_loose_ref_cache(refs
), NULL
, 0);
1479 while ((ok
= ref_iterator_advance(iter
)) == ITER_OK
) {
1481 * If the loose reference can be packed, add an entry
1482 * in the packed ref cache. If the reference should be
1483 * pruned, also add it to refs_to_prune.
1485 struct ref_entry
*packed_entry
;
1486 int is_tag_ref
= starts_with(iter
->refname
, "refs/tags/");
1488 /* Do not pack per-worktree refs: */
1489 if (ref_type(iter
->refname
) != REF_TYPE_NORMAL
)
1492 /* ALWAYS pack tags */
1493 if (!(flags
& PACK_REFS_ALL
) && !is_tag_ref
)
1496 /* Do not pack symbolic or broken refs: */
1497 if (iter
->flags
& REF_ISSYMREF
)
1500 if (!ref_resolves_to_object(iter
->refname
, iter
->oid
, iter
->flags
))
1504 * Create an entry in the packed-refs cache equivalent
1505 * to the one from the loose ref cache, except that
1506 * we don't copy the peeled status, because we want it
1509 packed_entry
= find_ref_entry(packed_refs
, iter
->refname
);
1511 /* Overwrite existing packed entry with info from loose entry */
1512 packed_entry
->flag
= REF_ISPACKED
;
1513 oidcpy(&packed_entry
->u
.value
.oid
, iter
->oid
);
1515 packed_entry
= create_ref_entry(iter
->refname
, iter
->oid
,
1517 add_ref_entry(packed_refs
, packed_entry
);
1519 oidclr(&packed_entry
->u
.value
.peeled
);
1521 /* Schedule the loose reference for pruning if requested. */
1522 if ((flags
& PACK_REFS_PRUNE
)) {
1523 struct ref_to_prune
*n
;
1524 FLEX_ALLOC_STR(n
, name
, iter
->refname
);
1525 hashcpy(n
->sha1
, iter
->oid
->hash
);
1526 n
->next
= refs_to_prune
;
1530 if (ok
!= ITER_DONE
)
1531 die("error while iterating over references");
1533 if (commit_packed_refs(refs
))
1534 die_errno("unable to overwrite old ref-pack file");
1536 prune_refs(refs
, refs_to_prune
);
1541 * Rewrite the packed-refs file, omitting any refs listed in
1542 * 'refnames'. On error, leave packed-refs unchanged, write an error
1543 * message to 'err', and return a nonzero value.
1545 * The refs in 'refnames' needn't be sorted. `err` must not be NULL.
1547 static int repack_without_refs(struct files_ref_store
*refs
,
1548 struct string_list
*refnames
, struct strbuf
*err
)
1550 struct ref_dir
*packed
;
1551 struct string_list_item
*refname
;
1552 int ret
, needs_repacking
= 0, removed
= 0;
1554 files_assert_main_repository(refs
, "repack_without_refs");
1557 /* Look for a packed ref */
1558 for_each_string_list_item(refname
, refnames
) {
1559 if (get_packed_ref(refs
, refname
->string
)) {
1560 needs_repacking
= 1;
1565 /* Avoid locking if we have nothing to do */
1566 if (!needs_repacking
)
1567 return 0; /* no refname exists in packed refs */
1569 if (lock_packed_refs(refs
, 0)) {
1570 unable_to_lock_message(files_packed_refs_path(refs
), errno
, err
);
1573 packed
= get_packed_refs(refs
);
1575 /* Remove refnames from the cache */
1576 for_each_string_list_item(refname
, refnames
)
1577 if (remove_entry_from_dir(packed
, refname
->string
) != -1)
1581 * All packed entries disappeared while we were
1582 * acquiring the lock.
1584 rollback_packed_refs(refs
);
1588 /* Write what remains */
1589 ret
= commit_packed_refs(refs
);
1591 strbuf_addf(err
, "unable to overwrite old ref-pack file: %s",
1596 static int files_delete_refs(struct ref_store
*ref_store
, const char *msg
,
1597 struct string_list
*refnames
, unsigned int flags
)
1599 struct files_ref_store
*refs
=
1600 files_downcast(ref_store
, REF_STORE_WRITE
, "delete_refs");
1601 struct strbuf err
= STRBUF_INIT
;
1607 result
= repack_without_refs(refs
, refnames
, &err
);
1610 * If we failed to rewrite the packed-refs file, then
1611 * it is unsafe to try to remove loose refs, because
1612 * doing so might expose an obsolete packed value for
1613 * a reference that might even point at an object that
1614 * has been garbage collected.
1616 if (refnames
->nr
== 1)
1617 error(_("could not delete reference %s: %s"),
1618 refnames
->items
[0].string
, err
.buf
);
1620 error(_("could not delete references: %s"), err
.buf
);
1625 for (i
= 0; i
< refnames
->nr
; i
++) {
1626 const char *refname
= refnames
->items
[i
].string
;
1628 if (refs_delete_ref(&refs
->base
, msg
, refname
, NULL
, flags
))
1629 result
|= error(_("could not remove reference %s"), refname
);
1633 strbuf_release(&err
);
1638 * People using contrib's git-new-workdir have .git/logs/refs ->
1639 * /some/other/path/.git/logs/refs, and that may live on another device.
1641 * IOW, to avoid cross device rename errors, the temporary renamed log must
1642 * live into logs/refs.
1644 #define TMP_RENAMED_LOG "refs/.tmp-renamed-log"
1647 const char *tmp_renamed_log
;
1651 static int rename_tmp_log_callback(const char *path
, void *cb_data
)
1653 struct rename_cb
*cb
= cb_data
;
1655 if (rename(cb
->tmp_renamed_log
, path
)) {
1657 * rename(a, b) when b is an existing directory ought
1658 * to result in ISDIR, but Solaris 5.8 gives ENOTDIR.
1659 * Sheesh. Record the true errno for error reporting,
1660 * but report EISDIR to raceproof_create_file() so
1661 * that it knows to retry.
1663 cb
->true_errno
= errno
;
1664 if (errno
== ENOTDIR
)
1672 static int rename_tmp_log(struct files_ref_store
*refs
, const char *newrefname
)
1674 struct strbuf path
= STRBUF_INIT
;
1675 struct strbuf tmp
= STRBUF_INIT
;
1676 struct rename_cb cb
;
1679 files_reflog_path(refs
, &path
, newrefname
);
1680 files_reflog_path(refs
, &tmp
, TMP_RENAMED_LOG
);
1681 cb
.tmp_renamed_log
= tmp
.buf
;
1682 ret
= raceproof_create_file(path
.buf
, rename_tmp_log_callback
, &cb
);
1684 if (errno
== EISDIR
)
1685 error("directory not empty: %s", path
.buf
);
1687 error("unable to move logfile %s to %s: %s",
1689 strerror(cb
.true_errno
));
1692 strbuf_release(&path
);
1693 strbuf_release(&tmp
);
1697 static int write_ref_to_lockfile(struct ref_lock
*lock
,
1698 const struct object_id
*oid
, struct strbuf
*err
);
1699 static int commit_ref_update(struct files_ref_store
*refs
,
1700 struct ref_lock
*lock
,
1701 const struct object_id
*oid
, const char *logmsg
,
1702 struct strbuf
*err
);
1704 static int files_rename_ref(struct ref_store
*ref_store
,
1705 const char *oldrefname
, const char *newrefname
,
1708 struct files_ref_store
*refs
=
1709 files_downcast(ref_store
, REF_STORE_WRITE
, "rename_ref");
1710 struct object_id oid
, orig_oid
;
1711 int flag
= 0, logmoved
= 0;
1712 struct ref_lock
*lock
;
1713 struct stat loginfo
;
1714 struct strbuf sb_oldref
= STRBUF_INIT
;
1715 struct strbuf sb_newref
= STRBUF_INIT
;
1716 struct strbuf tmp_renamed_log
= STRBUF_INIT
;
1718 struct strbuf err
= STRBUF_INIT
;
1720 files_reflog_path(refs
, &sb_oldref
, oldrefname
);
1721 files_reflog_path(refs
, &sb_newref
, newrefname
);
1722 files_reflog_path(refs
, &tmp_renamed_log
, TMP_RENAMED_LOG
);
1724 log
= !lstat(sb_oldref
.buf
, &loginfo
);
1725 if (log
&& S_ISLNK(loginfo
.st_mode
)) {
1726 ret
= error("reflog for %s is a symlink", oldrefname
);
1730 if (!refs_resolve_ref_unsafe(&refs
->base
, oldrefname
,
1731 RESOLVE_REF_READING
| RESOLVE_REF_NO_RECURSE
,
1732 orig_oid
.hash
, &flag
)) {
1733 ret
= error("refname %s not found", oldrefname
);
1737 if (flag
& REF_ISSYMREF
) {
1738 ret
= error("refname %s is a symbolic ref, renaming it is not supported",
1742 if (!refs_rename_ref_available(&refs
->base
, oldrefname
, newrefname
)) {
1747 if (log
&& rename(sb_oldref
.buf
, tmp_renamed_log
.buf
)) {
1748 ret
= error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG
": %s",
1749 oldrefname
, strerror(errno
));
1753 if (refs_delete_ref(&refs
->base
, logmsg
, oldrefname
,
1754 orig_oid
.hash
, REF_NODEREF
)) {
1755 error("unable to delete old %s", oldrefname
);
1760 * Since we are doing a shallow lookup, oid is not the
1761 * correct value to pass to delete_ref as old_oid. But that
1762 * doesn't matter, because an old_oid check wouldn't add to
1763 * the safety anyway; we want to delete the reference whatever
1764 * its current value.
1766 if (!refs_read_ref_full(&refs
->base
, newrefname
,
1767 RESOLVE_REF_READING
| RESOLVE_REF_NO_RECURSE
,
1769 refs_delete_ref(&refs
->base
, NULL
, newrefname
,
1770 NULL
, REF_NODEREF
)) {
1771 if (errno
== EISDIR
) {
1772 struct strbuf path
= STRBUF_INIT
;
1775 files_ref_path(refs
, &path
, newrefname
);
1776 result
= remove_empty_directories(&path
);
1777 strbuf_release(&path
);
1780 error("Directory not empty: %s", newrefname
);
1784 error("unable to delete existing %s", newrefname
);
1789 if (log
&& rename_tmp_log(refs
, newrefname
))
1794 lock
= lock_ref_sha1_basic(refs
, newrefname
, NULL
, NULL
, NULL
,
1795 REF_NODEREF
, NULL
, &err
);
1797 error("unable to rename '%s' to '%s': %s", oldrefname
, newrefname
, err
.buf
);
1798 strbuf_release(&err
);
1801 oidcpy(&lock
->old_oid
, &orig_oid
);
1803 if (write_ref_to_lockfile(lock
, &orig_oid
, &err
) ||
1804 commit_ref_update(refs
, lock
, &orig_oid
, logmsg
, &err
)) {
1805 error("unable to write current sha1 into %s: %s", newrefname
, err
.buf
);
1806 strbuf_release(&err
);
1814 lock
= lock_ref_sha1_basic(refs
, oldrefname
, NULL
, NULL
, NULL
,
1815 REF_NODEREF
, NULL
, &err
);
1817 error("unable to lock %s for rollback: %s", oldrefname
, err
.buf
);
1818 strbuf_release(&err
);
1822 flag
= log_all_ref_updates
;
1823 log_all_ref_updates
= LOG_REFS_NONE
;
1824 if (write_ref_to_lockfile(lock
, &orig_oid
, &err
) ||
1825 commit_ref_update(refs
, lock
, &orig_oid
, NULL
, &err
)) {
1826 error("unable to write current sha1 into %s: %s", oldrefname
, err
.buf
);
1827 strbuf_release(&err
);
1829 log_all_ref_updates
= flag
;
1832 if (logmoved
&& rename(sb_newref
.buf
, sb_oldref
.buf
))
1833 error("unable to restore logfile %s from %s: %s",
1834 oldrefname
, newrefname
, strerror(errno
));
1835 if (!logmoved
&& log
&&
1836 rename(tmp_renamed_log
.buf
, sb_oldref
.buf
))
1837 error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG
": %s",
1838 oldrefname
, strerror(errno
));
1841 strbuf_release(&sb_newref
);
1842 strbuf_release(&sb_oldref
);
1843 strbuf_release(&tmp_renamed_log
);
1848 static int close_ref(struct ref_lock
*lock
)
1850 if (close_lock_file(lock
->lk
))
1855 static int commit_ref(struct ref_lock
*lock
)
1857 char *path
= get_locked_file_path(lock
->lk
);
1860 if (!lstat(path
, &st
) && S_ISDIR(st
.st_mode
)) {
1862 * There is a directory at the path we want to rename
1863 * the lockfile to. Hopefully it is empty; try to
1866 size_t len
= strlen(path
);
1867 struct strbuf sb_path
= STRBUF_INIT
;
1869 strbuf_attach(&sb_path
, path
, len
, len
);
1872 * If this fails, commit_lock_file() will also fail
1873 * and will report the problem.
1875 remove_empty_directories(&sb_path
);
1876 strbuf_release(&sb_path
);
1881 if (commit_lock_file(lock
->lk
))
1886 static int open_or_create_logfile(const char *path
, void *cb
)
1890 *fd
= open(path
, O_APPEND
| O_WRONLY
| O_CREAT
, 0666);
1891 return (*fd
< 0) ? -1 : 0;
1895 * Create a reflog for a ref. If force_create = 0, only create the
1896 * reflog for certain refs (those for which should_autocreate_reflog
1897 * returns non-zero). Otherwise, create it regardless of the reference
1898 * name. If the logfile already existed or was created, return 0 and
1899 * set *logfd to the file descriptor opened for appending to the file.
1900 * If no logfile exists and we decided not to create one, return 0 and
1901 * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and
1904 static int log_ref_setup(struct files_ref_store
*refs
,
1905 const char *refname
, int force_create
,
1906 int *logfd
, struct strbuf
*err
)
1908 struct strbuf logfile_sb
= STRBUF_INIT
;
1911 files_reflog_path(refs
, &logfile_sb
, refname
);
1912 logfile
= strbuf_detach(&logfile_sb
, NULL
);
1914 if (force_create
|| should_autocreate_reflog(refname
)) {
1915 if (raceproof_create_file(logfile
, open_or_create_logfile
, logfd
)) {
1916 if (errno
== ENOENT
)
1917 strbuf_addf(err
, "unable to create directory for '%s': "
1918 "%s", logfile
, strerror(errno
));
1919 else if (errno
== EISDIR
)
1920 strbuf_addf(err
, "there are still logs under '%s'",
1923 strbuf_addf(err
, "unable to append to '%s': %s",
1924 logfile
, strerror(errno
));
1929 *logfd
= open(logfile
, O_APPEND
| O_WRONLY
, 0666);
1931 if (errno
== ENOENT
|| errno
== EISDIR
) {
1933 * The logfile doesn't already exist,
1934 * but that is not an error; it only
1935 * means that we won't write log
1940 strbuf_addf(err
, "unable to append to '%s': %s",
1941 logfile
, strerror(errno
));
1948 adjust_shared_perm(logfile
);
1958 static int files_create_reflog(struct ref_store
*ref_store
,
1959 const char *refname
, int force_create
,
1962 struct files_ref_store
*refs
=
1963 files_downcast(ref_store
, REF_STORE_WRITE
, "create_reflog");
1966 if (log_ref_setup(refs
, refname
, force_create
, &fd
, err
))
1975 static int log_ref_write_fd(int fd
, const struct object_id
*old_oid
,
1976 const struct object_id
*new_oid
,
1977 const char *committer
, const char *msg
)
1979 int msglen
, written
;
1980 unsigned maxlen
, len
;
1983 msglen
= msg
? strlen(msg
) : 0;
1984 maxlen
= strlen(committer
) + msglen
+ 100;
1985 logrec
= xmalloc(maxlen
);
1986 len
= xsnprintf(logrec
, maxlen
, "%s %s %s\n",
1987 oid_to_hex(old_oid
),
1988 oid_to_hex(new_oid
),
1991 len
+= copy_reflog_msg(logrec
+ len
- 1, msg
) - 1;
1993 written
= len
<= maxlen
? write_in_full(fd
, logrec
, len
) : -1;
2001 static int files_log_ref_write(struct files_ref_store
*refs
,
2002 const char *refname
, const struct object_id
*old_oid
,
2003 const struct object_id
*new_oid
, const char *msg
,
2004 int flags
, struct strbuf
*err
)
2008 if (log_all_ref_updates
== LOG_REFS_UNSET
)
2009 log_all_ref_updates
= is_bare_repository() ? LOG_REFS_NONE
: LOG_REFS_NORMAL
;
2011 result
= log_ref_setup(refs
, refname
,
2012 flags
& REF_FORCE_CREATE_REFLOG
,
2020 result
= log_ref_write_fd(logfd
, old_oid
, new_oid
,
2021 git_committer_info(0), msg
);
2023 struct strbuf sb
= STRBUF_INIT
;
2024 int save_errno
= errno
;
2026 files_reflog_path(refs
, &sb
, refname
);
2027 strbuf_addf(err
, "unable to append to '%s': %s",
2028 sb
.buf
, strerror(save_errno
));
2029 strbuf_release(&sb
);
2034 struct strbuf sb
= STRBUF_INIT
;
2035 int save_errno
= errno
;
2037 files_reflog_path(refs
, &sb
, refname
);
2038 strbuf_addf(err
, "unable to append to '%s': %s",
2039 sb
.buf
, strerror(save_errno
));
2040 strbuf_release(&sb
);
2047 * Write sha1 into the open lockfile, then close the lockfile. On
2048 * errors, rollback the lockfile, fill in *err and
2051 static int write_ref_to_lockfile(struct ref_lock
*lock
,
2052 const struct object_id
*oid
, struct strbuf
*err
)
2054 static char term
= '\n';
2058 o
= parse_object(oid
);
2061 "trying to write ref '%s' with nonexistent object %s",
2062 lock
->ref_name
, oid_to_hex(oid
));
2066 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
2068 "trying to write non-commit object %s to branch '%s'",
2069 oid_to_hex(oid
), lock
->ref_name
);
2073 fd
= get_lock_file_fd(lock
->lk
);
2074 if (write_in_full(fd
, oid_to_hex(oid
), GIT_SHA1_HEXSZ
) != GIT_SHA1_HEXSZ
||
2075 write_in_full(fd
, &term
, 1) != 1 ||
2076 close_ref(lock
) < 0) {
2078 "couldn't write '%s'", get_lock_file_path(lock
->lk
));
2086 * Commit a change to a loose reference that has already been written
2087 * to the loose reference lockfile. Also update the reflogs if
2088 * necessary, using the specified lockmsg (which can be NULL).
2090 static int commit_ref_update(struct files_ref_store
*refs
,
2091 struct ref_lock
*lock
,
2092 const struct object_id
*oid
, const char *logmsg
,
2095 files_assert_main_repository(refs
, "commit_ref_update");
2097 clear_loose_ref_cache(refs
);
2098 if (files_log_ref_write(refs
, lock
->ref_name
,
2099 &lock
->old_oid
, oid
,
2101 char *old_msg
= strbuf_detach(err
, NULL
);
2102 strbuf_addf(err
, "cannot update the ref '%s': %s",
2103 lock
->ref_name
, old_msg
);
2109 if (strcmp(lock
->ref_name
, "HEAD") != 0) {
2111 * Special hack: If a branch is updated directly and HEAD
2112 * points to it (may happen on the remote side of a push
2113 * for example) then logically the HEAD reflog should be
2115 * A generic solution implies reverse symref information,
2116 * but finding all symrefs pointing to the given branch
2117 * would be rather costly for this rare event (the direct
2118 * update of a branch) to be worth it. So let's cheat and
2119 * check with HEAD only which should cover 99% of all usage
2120 * scenarios (even 100% of the default ones).
2122 struct object_id head_oid
;
2124 const char *head_ref
;
2126 head_ref
= refs_resolve_ref_unsafe(&refs
->base
, "HEAD",
2127 RESOLVE_REF_READING
,
2128 head_oid
.hash
, &head_flag
);
2129 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
2130 !strcmp(head_ref
, lock
->ref_name
)) {
2131 struct strbuf log_err
= STRBUF_INIT
;
2132 if (files_log_ref_write(refs
, "HEAD",
2133 &lock
->old_oid
, oid
,
2134 logmsg
, 0, &log_err
)) {
2135 error("%s", log_err
.buf
);
2136 strbuf_release(&log_err
);
2141 if (commit_ref(lock
)) {
2142 strbuf_addf(err
, "couldn't set '%s'", lock
->ref_name
);
2151 static int create_ref_symlink(struct ref_lock
*lock
, const char *target
)
2154 #ifndef NO_SYMLINK_HEAD
2155 char *ref_path
= get_locked_file_path(lock
->lk
);
2157 ret
= symlink(target
, ref_path
);
2161 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
2166 static void update_symref_reflog(struct files_ref_store
*refs
,
2167 struct ref_lock
*lock
, const char *refname
,
2168 const char *target
, const char *logmsg
)
2170 struct strbuf err
= STRBUF_INIT
;
2171 struct object_id new_oid
;
2173 !refs_read_ref_full(&refs
->base
, target
,
2174 RESOLVE_REF_READING
, new_oid
.hash
, NULL
) &&
2175 files_log_ref_write(refs
, refname
, &lock
->old_oid
,
2176 &new_oid
, logmsg
, 0, &err
)) {
2177 error("%s", err
.buf
);
2178 strbuf_release(&err
);
2182 static int create_symref_locked(struct files_ref_store
*refs
,
2183 struct ref_lock
*lock
, const char *refname
,
2184 const char *target
, const char *logmsg
)
2186 if (prefer_symlink_refs
&& !create_ref_symlink(lock
, target
)) {
2187 update_symref_reflog(refs
, lock
, refname
, target
, logmsg
);
2191 if (!fdopen_lock_file(lock
->lk
, "w"))
2192 return error("unable to fdopen %s: %s",
2193 lock
->lk
->tempfile
.filename
.buf
, strerror(errno
));
2195 update_symref_reflog(refs
, lock
, refname
, target
, logmsg
);
2197 /* no error check; commit_ref will check ferror */
2198 fprintf(lock
->lk
->tempfile
.fp
, "ref: %s\n", target
);
2199 if (commit_ref(lock
) < 0)
2200 return error("unable to write symref for %s: %s", refname
,
2205 static int files_create_symref(struct ref_store
*ref_store
,
2206 const char *refname
, const char *target
,
2209 struct files_ref_store
*refs
=
2210 files_downcast(ref_store
, REF_STORE_WRITE
, "create_symref");
2211 struct strbuf err
= STRBUF_INIT
;
2212 struct ref_lock
*lock
;
2215 lock
= lock_ref_sha1_basic(refs
, refname
, NULL
,
2216 NULL
, NULL
, REF_NODEREF
, NULL
,
2219 error("%s", err
.buf
);
2220 strbuf_release(&err
);
2224 ret
= create_symref_locked(refs
, lock
, refname
, target
, logmsg
);
2229 static int files_reflog_exists(struct ref_store
*ref_store
,
2230 const char *refname
)
2232 struct files_ref_store
*refs
=
2233 files_downcast(ref_store
, REF_STORE_READ
, "reflog_exists");
2234 struct strbuf sb
= STRBUF_INIT
;
2238 files_reflog_path(refs
, &sb
, refname
);
2239 ret
= !lstat(sb
.buf
, &st
) && S_ISREG(st
.st_mode
);
2240 strbuf_release(&sb
);
2244 static int files_delete_reflog(struct ref_store
*ref_store
,
2245 const char *refname
)
2247 struct files_ref_store
*refs
=
2248 files_downcast(ref_store
, REF_STORE_WRITE
, "delete_reflog");
2249 struct strbuf sb
= STRBUF_INIT
;
2252 files_reflog_path(refs
, &sb
, refname
);
2253 ret
= remove_path(sb
.buf
);
2254 strbuf_release(&sb
);
2258 static int show_one_reflog_ent(struct strbuf
*sb
, each_reflog_ent_fn fn
, void *cb_data
)
2260 struct object_id ooid
, noid
;
2261 char *email_end
, *message
;
2262 timestamp_t timestamp
;
2264 const char *p
= sb
->buf
;
2266 /* old SP new SP name <email> SP time TAB msg LF */
2267 if (!sb
->len
|| sb
->buf
[sb
->len
- 1] != '\n' ||
2268 parse_oid_hex(p
, &ooid
, &p
) || *p
++ != ' ' ||
2269 parse_oid_hex(p
, &noid
, &p
) || *p
++ != ' ' ||
2270 !(email_end
= strchr(p
, '>')) ||
2271 email_end
[1] != ' ' ||
2272 !(timestamp
= parse_timestamp(email_end
+ 2, &message
, 10)) ||
2273 !message
|| message
[0] != ' ' ||
2274 (message
[1] != '+' && message
[1] != '-') ||
2275 !isdigit(message
[2]) || !isdigit(message
[3]) ||
2276 !isdigit(message
[4]) || !isdigit(message
[5]))
2277 return 0; /* corrupt? */
2278 email_end
[1] = '\0';
2279 tz
= strtol(message
+ 1, NULL
, 10);
2280 if (message
[6] != '\t')
2284 return fn(&ooid
, &noid
, p
, timestamp
, tz
, message
, cb_data
);
2287 static char *find_beginning_of_line(char *bob
, char *scan
)
2289 while (bob
< scan
&& *(--scan
) != '\n')
2290 ; /* keep scanning backwards */
2292 * Return either beginning of the buffer, or LF at the end of
2293 * the previous line.
2298 static int files_for_each_reflog_ent_reverse(struct ref_store
*ref_store
,
2299 const char *refname
,
2300 each_reflog_ent_fn fn
,
2303 struct files_ref_store
*refs
=
2304 files_downcast(ref_store
, REF_STORE_READ
,
2305 "for_each_reflog_ent_reverse");
2306 struct strbuf sb
= STRBUF_INIT
;
2309 int ret
= 0, at_tail
= 1;
2311 files_reflog_path(refs
, &sb
, refname
);
2312 logfp
= fopen(sb
.buf
, "r");
2313 strbuf_release(&sb
);
2317 /* Jump to the end */
2318 if (fseek(logfp
, 0, SEEK_END
) < 0)
2319 ret
= error("cannot seek back reflog for %s: %s",
2320 refname
, strerror(errno
));
2322 while (!ret
&& 0 < pos
) {
2328 /* Fill next block from the end */
2329 cnt
= (sizeof(buf
) < pos
) ? sizeof(buf
) : pos
;
2330 if (fseek(logfp
, pos
- cnt
, SEEK_SET
)) {
2331 ret
= error("cannot seek back reflog for %s: %s",
2332 refname
, strerror(errno
));
2335 nread
= fread(buf
, cnt
, 1, logfp
);
2337 ret
= error("cannot read %d bytes from reflog for %s: %s",
2338 cnt
, refname
, strerror(errno
));
2343 scanp
= endp
= buf
+ cnt
;
2344 if (at_tail
&& scanp
[-1] == '\n')
2345 /* Looking at the final LF at the end of the file */
2349 while (buf
< scanp
) {
2351 * terminating LF of the previous line, or the beginning
2356 bp
= find_beginning_of_line(buf
, scanp
);
2360 * The newline is the end of the previous line,
2361 * so we know we have complete line starting
2362 * at (bp + 1). Prefix it onto any prior data
2363 * we collected for the line and process it.
2365 strbuf_splice(&sb
, 0, 0, bp
+ 1, endp
- (bp
+ 1));
2368 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2374 * We are at the start of the buffer, and the
2375 * start of the file; there is no previous
2376 * line, and we have everything for this one.
2377 * Process it, and we can end the loop.
2379 strbuf_splice(&sb
, 0, 0, buf
, endp
- buf
);
2380 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2387 * We are at the start of the buffer, and there
2388 * is more file to read backwards. Which means
2389 * we are in the middle of a line. Note that we
2390 * may get here even if *bp was a newline; that
2391 * just means we are at the exact end of the
2392 * previous line, rather than some spot in the
2395 * Save away what we have to be combined with
2396 * the data from the next read.
2398 strbuf_splice(&sb
, 0, 0, buf
, endp
- buf
);
2405 die("BUG: reverse reflog parser had leftover data");
2408 strbuf_release(&sb
);
2412 static int files_for_each_reflog_ent(struct ref_store
*ref_store
,
2413 const char *refname
,
2414 each_reflog_ent_fn fn
, void *cb_data
)
2416 struct files_ref_store
*refs
=
2417 files_downcast(ref_store
, REF_STORE_READ
,
2418 "for_each_reflog_ent");
2420 struct strbuf sb
= STRBUF_INIT
;
2423 files_reflog_path(refs
, &sb
, refname
);
2424 logfp
= fopen(sb
.buf
, "r");
2425 strbuf_release(&sb
);
2429 while (!ret
&& !strbuf_getwholeline(&sb
, logfp
, '\n'))
2430 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2432 strbuf_release(&sb
);
2436 struct files_reflog_iterator
{
2437 struct ref_iterator base
;
2439 struct ref_store
*ref_store
;
2440 struct dir_iterator
*dir_iterator
;
2441 struct object_id oid
;
2444 static int files_reflog_iterator_advance(struct ref_iterator
*ref_iterator
)
2446 struct files_reflog_iterator
*iter
=
2447 (struct files_reflog_iterator
*)ref_iterator
;
2448 struct dir_iterator
*diter
= iter
->dir_iterator
;
2451 while ((ok
= dir_iterator_advance(diter
)) == ITER_OK
) {
2454 if (!S_ISREG(diter
->st
.st_mode
))
2456 if (diter
->basename
[0] == '.')
2458 if (ends_with(diter
->basename
, ".lock"))
2461 if (refs_read_ref_full(iter
->ref_store
,
2462 diter
->relative_path
, 0,
2463 iter
->oid
.hash
, &flags
)) {
2464 error("bad ref for %s", diter
->path
.buf
);
2468 iter
->base
.refname
= diter
->relative_path
;
2469 iter
->base
.oid
= &iter
->oid
;
2470 iter
->base
.flags
= flags
;
2474 iter
->dir_iterator
= NULL
;
2475 if (ref_iterator_abort(ref_iterator
) == ITER_ERROR
)
2480 static int files_reflog_iterator_peel(struct ref_iterator
*ref_iterator
,
2481 struct object_id
*peeled
)
2483 die("BUG: ref_iterator_peel() called for reflog_iterator");
2486 static int files_reflog_iterator_abort(struct ref_iterator
*ref_iterator
)
2488 struct files_reflog_iterator
*iter
=
2489 (struct files_reflog_iterator
*)ref_iterator
;
2492 if (iter
->dir_iterator
)
2493 ok
= dir_iterator_abort(iter
->dir_iterator
);
2495 base_ref_iterator_free(ref_iterator
);
2499 static struct ref_iterator_vtable files_reflog_iterator_vtable
= {
2500 files_reflog_iterator_advance
,
2501 files_reflog_iterator_peel
,
2502 files_reflog_iterator_abort
2505 static struct ref_iterator
*files_reflog_iterator_begin(struct ref_store
*ref_store
)
2507 struct files_ref_store
*refs
=
2508 files_downcast(ref_store
, REF_STORE_READ
,
2509 "reflog_iterator_begin");
2510 struct files_reflog_iterator
*iter
= xcalloc(1, sizeof(*iter
));
2511 struct ref_iterator
*ref_iterator
= &iter
->base
;
2512 struct strbuf sb
= STRBUF_INIT
;
2514 base_ref_iterator_init(ref_iterator
, &files_reflog_iterator_vtable
);
2515 files_reflog_path(refs
, &sb
, NULL
);
2516 iter
->dir_iterator
= dir_iterator_begin(sb
.buf
);
2517 iter
->ref_store
= ref_store
;
2518 strbuf_release(&sb
);
2519 return ref_iterator
;
2522 static int ref_update_reject_duplicates(struct string_list
*refnames
,
2525 int i
, n
= refnames
->nr
;
2529 for (i
= 1; i
< n
; i
++)
2530 if (!strcmp(refnames
->items
[i
- 1].string
, refnames
->items
[i
].string
)) {
2532 "multiple updates for ref '%s' not allowed.",
2533 refnames
->items
[i
].string
);
2540 * If update is a direct update of head_ref (the reference pointed to
2541 * by HEAD), then add an extra REF_LOG_ONLY update for HEAD.
2543 static int split_head_update(struct ref_update
*update
,
2544 struct ref_transaction
*transaction
,
2545 const char *head_ref
,
2546 struct string_list
*affected_refnames
,
2549 struct string_list_item
*item
;
2550 struct ref_update
*new_update
;
2552 if ((update
->flags
& REF_LOG_ONLY
) ||
2553 (update
->flags
& REF_ISPRUNING
) ||
2554 (update
->flags
& REF_UPDATE_VIA_HEAD
))
2557 if (strcmp(update
->refname
, head_ref
))
2561 * First make sure that HEAD is not already in the
2562 * transaction. This insertion is O(N) in the transaction
2563 * size, but it happens at most once per transaction.
2565 item
= string_list_insert(affected_refnames
, "HEAD");
2567 /* An entry already existed */
2569 "multiple updates for 'HEAD' (including one "
2570 "via its referent '%s') are not allowed",
2572 return TRANSACTION_NAME_CONFLICT
;
2575 new_update
= ref_transaction_add_update(
2576 transaction
, "HEAD",
2577 update
->flags
| REF_LOG_ONLY
| REF_NODEREF
,
2578 update
->new_oid
.hash
, update
->old_oid
.hash
,
2581 item
->util
= new_update
;
2587 * update is for a symref that points at referent and doesn't have
2588 * REF_NODEREF set. Split it into two updates:
2589 * - The original update, but with REF_LOG_ONLY and REF_NODEREF set
2590 * - A new, separate update for the referent reference
2591 * Note that the new update will itself be subject to splitting when
2592 * the iteration gets to it.
2594 static int split_symref_update(struct files_ref_store
*refs
,
2595 struct ref_update
*update
,
2596 const char *referent
,
2597 struct ref_transaction
*transaction
,
2598 struct string_list
*affected_refnames
,
2601 struct string_list_item
*item
;
2602 struct ref_update
*new_update
;
2603 unsigned int new_flags
;
2606 * First make sure that referent is not already in the
2607 * transaction. This insertion is O(N) in the transaction
2608 * size, but it happens at most once per symref in a
2611 item
= string_list_insert(affected_refnames
, referent
);
2613 /* An entry already existed */
2615 "multiple updates for '%s' (including one "
2616 "via symref '%s') are not allowed",
2617 referent
, update
->refname
);
2618 return TRANSACTION_NAME_CONFLICT
;
2621 new_flags
= update
->flags
;
2622 if (!strcmp(update
->refname
, "HEAD")) {
2624 * Record that the new update came via HEAD, so that
2625 * when we process it, split_head_update() doesn't try
2626 * to add another reflog update for HEAD. Note that
2627 * this bit will be propagated if the new_update
2628 * itself needs to be split.
2630 new_flags
|= REF_UPDATE_VIA_HEAD
;
2633 new_update
= ref_transaction_add_update(
2634 transaction
, referent
, new_flags
,
2635 update
->new_oid
.hash
, update
->old_oid
.hash
,
2638 new_update
->parent_update
= update
;
2641 * Change the symbolic ref update to log only. Also, it
2642 * doesn't need to check its old SHA-1 value, as that will be
2643 * done when new_update is processed.
2645 update
->flags
|= REF_LOG_ONLY
| REF_NODEREF
;
2646 update
->flags
&= ~REF_HAVE_OLD
;
2648 item
->util
= new_update
;
2654 * Return the refname under which update was originally requested.
2656 static const char *original_update_refname(struct ref_update
*update
)
2658 while (update
->parent_update
)
2659 update
= update
->parent_update
;
2661 return update
->refname
;
2665 * Check whether the REF_HAVE_OLD and old_oid values stored in update
2666 * are consistent with oid, which is the reference's current value. If
2667 * everything is OK, return 0; otherwise, write an error message to
2668 * err and return -1.
2670 static int check_old_oid(struct ref_update
*update
, struct object_id
*oid
,
2673 if (!(update
->flags
& REF_HAVE_OLD
) ||
2674 !oidcmp(oid
, &update
->old_oid
))
2677 if (is_null_oid(&update
->old_oid
))
2678 strbuf_addf(err
, "cannot lock ref '%s': "
2679 "reference already exists",
2680 original_update_refname(update
));
2681 else if (is_null_oid(oid
))
2682 strbuf_addf(err
, "cannot lock ref '%s': "
2683 "reference is missing but expected %s",
2684 original_update_refname(update
),
2685 oid_to_hex(&update
->old_oid
));
2687 strbuf_addf(err
, "cannot lock ref '%s': "
2688 "is at %s but expected %s",
2689 original_update_refname(update
),
2691 oid_to_hex(&update
->old_oid
));
2697 * Prepare for carrying out update:
2698 * - Lock the reference referred to by update.
2699 * - Read the reference under lock.
2700 * - Check that its old SHA-1 value (if specified) is correct, and in
2701 * any case record it in update->lock->old_oid for later use when
2702 * writing the reflog.
2703 * - If it is a symref update without REF_NODEREF, split it up into a
2704 * REF_LOG_ONLY update of the symref and add a separate update for
2705 * the referent to transaction.
2706 * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY
2709 static int lock_ref_for_update(struct files_ref_store
*refs
,
2710 struct ref_update
*update
,
2711 struct ref_transaction
*transaction
,
2712 const char *head_ref
,
2713 struct string_list
*affected_refnames
,
2716 struct strbuf referent
= STRBUF_INIT
;
2717 int mustexist
= (update
->flags
& REF_HAVE_OLD
) &&
2718 !is_null_oid(&update
->old_oid
);
2720 struct ref_lock
*lock
;
2722 files_assert_main_repository(refs
, "lock_ref_for_update");
2724 if ((update
->flags
& REF_HAVE_NEW
) && is_null_oid(&update
->new_oid
))
2725 update
->flags
|= REF_DELETING
;
2728 ret
= split_head_update(update
, transaction
, head_ref
,
2729 affected_refnames
, err
);
2734 ret
= lock_raw_ref(refs
, update
->refname
, mustexist
,
2735 affected_refnames
, NULL
,
2737 &update
->type
, err
);
2741 reason
= strbuf_detach(err
, NULL
);
2742 strbuf_addf(err
, "cannot lock ref '%s': %s",
2743 original_update_refname(update
), reason
);
2748 update
->backend_data
= lock
;
2750 if (update
->type
& REF_ISSYMREF
) {
2751 if (update
->flags
& REF_NODEREF
) {
2753 * We won't be reading the referent as part of
2754 * the transaction, so we have to read it here
2755 * to record and possibly check old_sha1:
2757 if (refs_read_ref_full(&refs
->base
,
2759 lock
->old_oid
.hash
, NULL
)) {
2760 if (update
->flags
& REF_HAVE_OLD
) {
2761 strbuf_addf(err
, "cannot lock ref '%s': "
2762 "error reading reference",
2763 original_update_refname(update
));
2766 } else if (check_old_oid(update
, &lock
->old_oid
, err
)) {
2767 return TRANSACTION_GENERIC_ERROR
;
2771 * Create a new update for the reference this
2772 * symref is pointing at. Also, we will record
2773 * and verify old_sha1 for this update as part
2774 * of processing the split-off update, so we
2775 * don't have to do it here.
2777 ret
= split_symref_update(refs
, update
,
2778 referent
.buf
, transaction
,
2779 affected_refnames
, err
);
2784 struct ref_update
*parent_update
;
2786 if (check_old_oid(update
, &lock
->old_oid
, err
))
2787 return TRANSACTION_GENERIC_ERROR
;
2790 * If this update is happening indirectly because of a
2791 * symref update, record the old SHA-1 in the parent
2794 for (parent_update
= update
->parent_update
;
2796 parent_update
= parent_update
->parent_update
) {
2797 struct ref_lock
*parent_lock
= parent_update
->backend_data
;
2798 oidcpy(&parent_lock
->old_oid
, &lock
->old_oid
);
2802 if ((update
->flags
& REF_HAVE_NEW
) &&
2803 !(update
->flags
& REF_DELETING
) &&
2804 !(update
->flags
& REF_LOG_ONLY
)) {
2805 if (!(update
->type
& REF_ISSYMREF
) &&
2806 !oidcmp(&lock
->old_oid
, &update
->new_oid
)) {
2808 * The reference already has the desired
2809 * value, so we don't need to write it.
2811 } else if (write_ref_to_lockfile(lock
, &update
->new_oid
,
2813 char *write_err
= strbuf_detach(err
, NULL
);
2816 * The lock was freed upon failure of
2817 * write_ref_to_lockfile():
2819 update
->backend_data
= NULL
;
2821 "cannot update ref '%s': %s",
2822 update
->refname
, write_err
);
2824 return TRANSACTION_GENERIC_ERROR
;
2826 update
->flags
|= REF_NEEDS_COMMIT
;
2829 if (!(update
->flags
& REF_NEEDS_COMMIT
)) {
2831 * We didn't call write_ref_to_lockfile(), so
2832 * the lockfile is still open. Close it to
2833 * free up the file descriptor:
2835 if (close_ref(lock
)) {
2836 strbuf_addf(err
, "couldn't close '%s.lock'",
2838 return TRANSACTION_GENERIC_ERROR
;
2844 static int files_transaction_commit(struct ref_store
*ref_store
,
2845 struct ref_transaction
*transaction
,
2848 struct files_ref_store
*refs
=
2849 files_downcast(ref_store
, REF_STORE_WRITE
,
2850 "ref_transaction_commit");
2853 struct string_list refs_to_delete
= STRING_LIST_INIT_NODUP
;
2854 struct string_list_item
*ref_to_delete
;
2855 struct string_list affected_refnames
= STRING_LIST_INIT_NODUP
;
2856 char *head_ref
= NULL
;
2858 struct object_id head_oid
;
2859 struct strbuf sb
= STRBUF_INIT
;
2863 if (transaction
->state
!= REF_TRANSACTION_OPEN
)
2864 die("BUG: commit called for transaction that is not open");
2866 if (!transaction
->nr
) {
2867 transaction
->state
= REF_TRANSACTION_CLOSED
;
2872 * Fail if a refname appears more than once in the
2873 * transaction. (If we end up splitting up any updates using
2874 * split_symref_update() or split_head_update(), those
2875 * functions will check that the new updates don't have the
2876 * same refname as any existing ones.)
2878 for (i
= 0; i
< transaction
->nr
; i
++) {
2879 struct ref_update
*update
= transaction
->updates
[i
];
2880 struct string_list_item
*item
=
2881 string_list_append(&affected_refnames
, update
->refname
);
2884 * We store a pointer to update in item->util, but at
2885 * the moment we never use the value of this field
2886 * except to check whether it is non-NULL.
2888 item
->util
= update
;
2890 string_list_sort(&affected_refnames
);
2891 if (ref_update_reject_duplicates(&affected_refnames
, err
)) {
2892 ret
= TRANSACTION_GENERIC_ERROR
;
2897 * Special hack: If a branch is updated directly and HEAD
2898 * points to it (may happen on the remote side of a push
2899 * for example) then logically the HEAD reflog should be
2902 * A generic solution would require reverse symref lookups,
2903 * but finding all symrefs pointing to a given branch would be
2904 * rather costly for this rare event (the direct update of a
2905 * branch) to be worth it. So let's cheat and check with HEAD
2906 * only, which should cover 99% of all usage scenarios (even
2907 * 100% of the default ones).
2909 * So if HEAD is a symbolic reference, then record the name of
2910 * the reference that it points to. If we see an update of
2911 * head_ref within the transaction, then split_head_update()
2912 * arranges for the reflog of HEAD to be updated, too.
2914 head_ref
= refs_resolve_refdup(ref_store
, "HEAD",
2915 RESOLVE_REF_NO_RECURSE
,
2916 head_oid
.hash
, &head_type
);
2918 if (head_ref
&& !(head_type
& REF_ISSYMREF
)) {
2924 * Acquire all locks, verify old values if provided, check
2925 * that new values are valid, and write new values to the
2926 * lockfiles, ready to be activated. Only keep one lockfile
2927 * open at a time to avoid running out of file descriptors.
2929 for (i
= 0; i
< transaction
->nr
; i
++) {
2930 struct ref_update
*update
= transaction
->updates
[i
];
2932 ret
= lock_ref_for_update(refs
, update
, transaction
,
2933 head_ref
, &affected_refnames
, err
);
2938 /* Perform updates first so live commits remain referenced */
2939 for (i
= 0; i
< transaction
->nr
; i
++) {
2940 struct ref_update
*update
= transaction
->updates
[i
];
2941 struct ref_lock
*lock
= update
->backend_data
;
2943 if (update
->flags
& REF_NEEDS_COMMIT
||
2944 update
->flags
& REF_LOG_ONLY
) {
2945 if (files_log_ref_write(refs
,
2949 update
->msg
, update
->flags
,
2951 char *old_msg
= strbuf_detach(err
, NULL
);
2953 strbuf_addf(err
, "cannot update the ref '%s': %s",
2954 lock
->ref_name
, old_msg
);
2957 update
->backend_data
= NULL
;
2958 ret
= TRANSACTION_GENERIC_ERROR
;
2962 if (update
->flags
& REF_NEEDS_COMMIT
) {
2963 clear_loose_ref_cache(refs
);
2964 if (commit_ref(lock
)) {
2965 strbuf_addf(err
, "couldn't set '%s'", lock
->ref_name
);
2967 update
->backend_data
= NULL
;
2968 ret
= TRANSACTION_GENERIC_ERROR
;
2973 /* Perform deletes now that updates are safely completed */
2974 for (i
= 0; i
< transaction
->nr
; i
++) {
2975 struct ref_update
*update
= transaction
->updates
[i
];
2976 struct ref_lock
*lock
= update
->backend_data
;
2978 if (update
->flags
& REF_DELETING
&&
2979 !(update
->flags
& REF_LOG_ONLY
)) {
2980 if (!(update
->type
& REF_ISPACKED
) ||
2981 update
->type
& REF_ISSYMREF
) {
2982 /* It is a loose reference. */
2984 files_ref_path(refs
, &sb
, lock
->ref_name
);
2985 if (unlink_or_msg(sb
.buf
, err
)) {
2986 ret
= TRANSACTION_GENERIC_ERROR
;
2989 update
->flags
|= REF_DELETED_LOOSE
;
2992 if (!(update
->flags
& REF_ISPRUNING
))
2993 string_list_append(&refs_to_delete
,
2998 if (repack_without_refs(refs
, &refs_to_delete
, err
)) {
2999 ret
= TRANSACTION_GENERIC_ERROR
;
3003 /* Delete the reflogs of any references that were deleted: */
3004 for_each_string_list_item(ref_to_delete
, &refs_to_delete
) {
3006 files_reflog_path(refs
, &sb
, ref_to_delete
->string
);
3007 if (!unlink_or_warn(sb
.buf
))
3008 try_remove_empty_parents(refs
, ref_to_delete
->string
,
3009 REMOVE_EMPTY_PARENTS_REFLOG
);
3012 clear_loose_ref_cache(refs
);
3015 strbuf_release(&sb
);
3016 transaction
->state
= REF_TRANSACTION_CLOSED
;
3018 for (i
= 0; i
< transaction
->nr
; i
++) {
3019 struct ref_update
*update
= transaction
->updates
[i
];
3020 struct ref_lock
*lock
= update
->backend_data
;
3025 if (update
->flags
& REF_DELETED_LOOSE
) {
3027 * The loose reference was deleted. Delete any
3028 * empty parent directories. (Note that this
3029 * can only work because we have already
3030 * removed the lockfile.)
3032 try_remove_empty_parents(refs
, update
->refname
,
3033 REMOVE_EMPTY_PARENTS_REF
);
3037 string_list_clear(&refs_to_delete
, 0);
3039 string_list_clear(&affected_refnames
, 0);
3044 static int ref_present(const char *refname
,
3045 const struct object_id
*oid
, int flags
, void *cb_data
)
3047 struct string_list
*affected_refnames
= cb_data
;
3049 return string_list_has_string(affected_refnames
, refname
);
3052 static int files_initial_transaction_commit(struct ref_store
*ref_store
,
3053 struct ref_transaction
*transaction
,
3056 struct files_ref_store
*refs
=
3057 files_downcast(ref_store
, REF_STORE_WRITE
,
3058 "initial_ref_transaction_commit");
3061 struct string_list affected_refnames
= STRING_LIST_INIT_NODUP
;
3065 if (transaction
->state
!= REF_TRANSACTION_OPEN
)
3066 die("BUG: commit called for transaction that is not open");
3068 /* Fail if a refname appears more than once in the transaction: */
3069 for (i
= 0; i
< transaction
->nr
; i
++)
3070 string_list_append(&affected_refnames
,
3071 transaction
->updates
[i
]->refname
);
3072 string_list_sort(&affected_refnames
);
3073 if (ref_update_reject_duplicates(&affected_refnames
, err
)) {
3074 ret
= TRANSACTION_GENERIC_ERROR
;
3079 * It's really undefined to call this function in an active
3080 * repository or when there are existing references: we are
3081 * only locking and changing packed-refs, so (1) any
3082 * simultaneous processes might try to change a reference at
3083 * the same time we do, and (2) any existing loose versions of
3084 * the references that we are setting would have precedence
3085 * over our values. But some remote helpers create the remote
3086 * "HEAD" and "master" branches before calling this function,
3087 * so here we really only check that none of the references
3088 * that we are creating already exists.
3090 if (refs_for_each_rawref(&refs
->base
, ref_present
,
3091 &affected_refnames
))
3092 die("BUG: initial ref transaction called with existing refs");
3094 for (i
= 0; i
< transaction
->nr
; i
++) {
3095 struct ref_update
*update
= transaction
->updates
[i
];
3097 if ((update
->flags
& REF_HAVE_OLD
) &&
3098 !is_null_oid(&update
->old_oid
))
3099 die("BUG: initial ref transaction with old_sha1 set");
3100 if (refs_verify_refname_available(&refs
->base
, update
->refname
,
3101 &affected_refnames
, NULL
,
3103 ret
= TRANSACTION_NAME_CONFLICT
;
3108 if (lock_packed_refs(refs
, 0)) {
3109 strbuf_addf(err
, "unable to lock packed-refs file: %s",
3111 ret
= TRANSACTION_GENERIC_ERROR
;
3115 for (i
= 0; i
< transaction
->nr
; i
++) {
3116 struct ref_update
*update
= transaction
->updates
[i
];
3118 if ((update
->flags
& REF_HAVE_NEW
) &&
3119 !is_null_oid(&update
->new_oid
))
3120 add_packed_ref(refs
, update
->refname
,
3124 if (commit_packed_refs(refs
)) {
3125 strbuf_addf(err
, "unable to commit packed-refs file: %s",
3127 ret
= TRANSACTION_GENERIC_ERROR
;
3132 transaction
->state
= REF_TRANSACTION_CLOSED
;
3133 string_list_clear(&affected_refnames
, 0);
3137 struct expire_reflog_cb
{
3139 reflog_expiry_should_prune_fn
*should_prune_fn
;
3142 struct object_id last_kept_oid
;
3145 static int expire_reflog_ent(struct object_id
*ooid
, struct object_id
*noid
,
3146 const char *email
, timestamp_t timestamp
, int tz
,
3147 const char *message
, void *cb_data
)
3149 struct expire_reflog_cb
*cb
= cb_data
;
3150 struct expire_reflog_policy_cb
*policy_cb
= cb
->policy_cb
;
3152 if (cb
->flags
& EXPIRE_REFLOGS_REWRITE
)
3153 ooid
= &cb
->last_kept_oid
;
3155 if ((*cb
->should_prune_fn
)(ooid
, noid
, email
, timestamp
, tz
,
3156 message
, policy_cb
)) {
3158 printf("would prune %s", message
);
3159 else if (cb
->flags
& EXPIRE_REFLOGS_VERBOSE
)
3160 printf("prune %s", message
);
3163 fprintf(cb
->newlog
, "%s %s %s %"PRItime
" %+05d\t%s",
3164 oid_to_hex(ooid
), oid_to_hex(noid
),
3165 email
, timestamp
, tz
, message
);
3166 oidcpy(&cb
->last_kept_oid
, noid
);
3168 if (cb
->flags
& EXPIRE_REFLOGS_VERBOSE
)
3169 printf("keep %s", message
);
3174 static int files_reflog_expire(struct ref_store
*ref_store
,
3175 const char *refname
, const unsigned char *sha1
,
3177 reflog_expiry_prepare_fn prepare_fn
,
3178 reflog_expiry_should_prune_fn should_prune_fn
,
3179 reflog_expiry_cleanup_fn cleanup_fn
,
3180 void *policy_cb_data
)
3182 struct files_ref_store
*refs
=
3183 files_downcast(ref_store
, REF_STORE_WRITE
, "reflog_expire");
3184 static struct lock_file reflog_lock
;
3185 struct expire_reflog_cb cb
;
3186 struct ref_lock
*lock
;
3187 struct strbuf log_file_sb
= STRBUF_INIT
;
3191 struct strbuf err
= STRBUF_INIT
;
3192 struct object_id oid
;
3194 memset(&cb
, 0, sizeof(cb
));
3196 cb
.policy_cb
= policy_cb_data
;
3197 cb
.should_prune_fn
= should_prune_fn
;
3200 * The reflog file is locked by holding the lock on the
3201 * reference itself, plus we might need to update the
3202 * reference if --updateref was specified:
3204 lock
= lock_ref_sha1_basic(refs
, refname
, sha1
,
3205 NULL
, NULL
, REF_NODEREF
,
3208 error("cannot lock ref '%s': %s", refname
, err
.buf
);
3209 strbuf_release(&err
);
3212 if (!refs_reflog_exists(ref_store
, refname
)) {
3217 files_reflog_path(refs
, &log_file_sb
, refname
);
3218 log_file
= strbuf_detach(&log_file_sb
, NULL
);
3219 if (!(flags
& EXPIRE_REFLOGS_DRY_RUN
)) {
3221 * Even though holding $GIT_DIR/logs/$reflog.lock has
3222 * no locking implications, we use the lock_file
3223 * machinery here anyway because it does a lot of the
3224 * work we need, including cleaning up if the program
3225 * exits unexpectedly.
3227 if (hold_lock_file_for_update(&reflog_lock
, log_file
, 0) < 0) {
3228 struct strbuf err
= STRBUF_INIT
;
3229 unable_to_lock_message(log_file
, errno
, &err
);
3230 error("%s", err
.buf
);
3231 strbuf_release(&err
);
3234 cb
.newlog
= fdopen_lock_file(&reflog_lock
, "w");
3236 error("cannot fdopen %s (%s)",
3237 get_lock_file_path(&reflog_lock
), strerror(errno
));
3242 hashcpy(oid
.hash
, sha1
);
3244 (*prepare_fn
)(refname
, &oid
, cb
.policy_cb
);
3245 refs_for_each_reflog_ent(ref_store
, refname
, expire_reflog_ent
, &cb
);
3246 (*cleanup_fn
)(cb
.policy_cb
);
3248 if (!(flags
& EXPIRE_REFLOGS_DRY_RUN
)) {
3250 * It doesn't make sense to adjust a reference pointed
3251 * to by a symbolic ref based on expiring entries in
3252 * the symbolic reference's reflog. Nor can we update
3253 * a reference if there are no remaining reflog
3256 int update
= (flags
& EXPIRE_REFLOGS_UPDATE_REF
) &&
3257 !(type
& REF_ISSYMREF
) &&
3258 !is_null_oid(&cb
.last_kept_oid
);
3260 if (close_lock_file(&reflog_lock
)) {
3261 status
|= error("couldn't write %s: %s", log_file
,
3263 } else if (update
&&
3264 (write_in_full(get_lock_file_fd(lock
->lk
),
3265 oid_to_hex(&cb
.last_kept_oid
), GIT_SHA1_HEXSZ
) != GIT_SHA1_HEXSZ
||
3266 write_str_in_full(get_lock_file_fd(lock
->lk
), "\n") != 1 ||
3267 close_ref(lock
) < 0)) {
3268 status
|= error("couldn't write %s",
3269 get_lock_file_path(lock
->lk
));
3270 rollback_lock_file(&reflog_lock
);
3271 } else if (commit_lock_file(&reflog_lock
)) {
3272 status
|= error("unable to write reflog '%s' (%s)",
3273 log_file
, strerror(errno
));
3274 } else if (update
&& commit_ref(lock
)) {
3275 status
|= error("couldn't set %s", lock
->ref_name
);
3283 rollback_lock_file(&reflog_lock
);
3289 static int files_init_db(struct ref_store
*ref_store
, struct strbuf
*err
)
3291 struct files_ref_store
*refs
=
3292 files_downcast(ref_store
, REF_STORE_WRITE
, "init_db");
3293 struct strbuf sb
= STRBUF_INIT
;
3296 * Create .git/refs/{heads,tags}
3298 files_ref_path(refs
, &sb
, "refs/heads");
3299 safe_create_dir(sb
.buf
, 1);
3302 files_ref_path(refs
, &sb
, "refs/tags");
3303 safe_create_dir(sb
.buf
, 1);
3305 strbuf_release(&sb
);
3309 struct ref_storage_be refs_be_files
= {
3312 files_ref_store_create
,
3314 files_transaction_commit
,
3315 files_initial_transaction_commit
,
3319 files_create_symref
,
3323 files_ref_iterator_begin
,
3326 files_reflog_iterator_begin
,
3327 files_for_each_reflog_ent
,
3328 files_for_each_reflog_ent_reverse
,
3329 files_reflog_exists
,
3330 files_create_reflog
,
3331 files_delete_reflog
,