1 #include "../git-compat-util.h"
4 #include "../environment.h"
5 #include "../gettext.h"
9 #include "refs-internal.h"
10 #include "ref-cache.h"
11 #include "packed-backend.h"
13 #include "../iterator.h"
14 #include "../dir-iterator.h"
15 #include "../lockfile.h"
16 #include "../object.h"
17 #include "../object-file.h"
20 #include "../chdir-notify.h"
22 #include "../worktree.h"
23 #include "../wrapper.h"
24 #include "../write-or-die.h"
25 #include "../revision.h"
26 #include <wildmatch.h>
29 * This backend uses the following flags in `ref_update::flags` for
30 * internal bookkeeping purposes. Their numerical values must not
31 * conflict with REF_NO_DEREF, REF_FORCE_CREATE_REFLOG, REF_HAVE_NEW,
32 * or REF_HAVE_OLD, which are also stored in `ref_update::flags`.
36 * Used as a flag in ref_update::flags when a loose ref is being
37 * pruned. This flag must only be used when REF_NO_DEREF is set.
39 #define REF_IS_PRUNING (1 << 4)
42 * Flag passed to lock_ref_sha1_basic() telling it to tolerate broken
43 * refs (i.e., because the reference is about to be deleted anyway).
45 #define REF_DELETING (1 << 5)
48 * Used as a flag in ref_update::flags when the lockfile needs to be
51 #define REF_NEEDS_COMMIT (1 << 6)
54 * Used as a flag in ref_update::flags when the ref_update was via an
57 #define REF_UPDATE_VIA_HEAD (1 << 8)
60 * Used as a flag in ref_update::flags when a reference has been
61 * deleted and the ref's parent directories may need cleanup.
63 #define REF_DELETED_RMDIR (1 << 9)
68 struct object_id old_oid
;
71 struct files_ref_store
{
72 struct ref_store base
;
73 unsigned int store_flags
;
77 struct ref_cache
*loose
;
79 struct ref_store
*packed_ref_store
;
82 static void clear_loose_ref_cache(struct files_ref_store
*refs
)
85 free_ref_cache(refs
->loose
);
91 * Create a new submodule ref cache and add it to the internal
94 static struct ref_store
*files_ref_store_create(struct repository
*repo
,
98 struct files_ref_store
*refs
= xcalloc(1, sizeof(*refs
));
99 struct ref_store
*ref_store
= (struct ref_store
*)refs
;
100 struct strbuf sb
= STRBUF_INIT
;
102 base_ref_store_init(ref_store
, repo
, gitdir
, &refs_be_files
);
103 refs
->store_flags
= flags
;
104 get_common_dir_noenv(&sb
, gitdir
);
105 refs
->gitcommondir
= strbuf_detach(&sb
, NULL
);
106 refs
->packed_ref_store
=
107 packed_ref_store_create(repo
, refs
->gitcommondir
, flags
);
109 chdir_notify_reparent("files-backend $GIT_DIR", &refs
->base
.gitdir
);
110 chdir_notify_reparent("files-backend $GIT_COMMONDIR",
111 &refs
->gitcommondir
);
117 * Die if refs is not the main ref store. caller is used in any
118 * necessary error messages.
120 static void files_assert_main_repository(struct files_ref_store
*refs
,
123 if (refs
->store_flags
& REF_STORE_MAIN
)
126 BUG("operation %s only allowed for main ref store", caller
);
130 * Downcast ref_store to files_ref_store. Die if ref_store is not a
131 * files_ref_store. required_flags is compared with ref_store's
132 * store_flags to ensure the ref_store has all required capabilities.
133 * "caller" is used in any necessary error messages.
135 static struct files_ref_store
*files_downcast(struct ref_store
*ref_store
,
136 unsigned int required_flags
,
139 struct files_ref_store
*refs
;
141 if (ref_store
->be
!= &refs_be_files
)
142 BUG("ref_store is type \"%s\" not \"files\" in %s",
143 ref_store
->be
->name
, caller
);
145 refs
= (struct files_ref_store
*)ref_store
;
147 if ((refs
->store_flags
& required_flags
) != required_flags
)
148 BUG("operation %s requires abilities 0x%x, but only have 0x%x",
149 caller
, required_flags
, refs
->store_flags
);
154 static void files_reflog_path(struct files_ref_store
*refs
,
158 const char *bare_refname
;
161 enum ref_worktree_type wt_type
= parse_worktree_ref(
162 refname
, &wtname
, &wtname_len
, &bare_refname
);
165 case REF_WORKTREE_CURRENT
:
166 strbuf_addf(sb
, "%s/logs/%s", refs
->base
.gitdir
, refname
);
168 case REF_WORKTREE_SHARED
:
169 case REF_WORKTREE_MAIN
:
170 strbuf_addf(sb
, "%s/logs/%s", refs
->gitcommondir
, bare_refname
);
172 case REF_WORKTREE_OTHER
:
173 strbuf_addf(sb
, "%s/worktrees/%.*s/logs/%s", refs
->gitcommondir
,
174 wtname_len
, wtname
, bare_refname
);
177 BUG("unknown ref type %d of ref %s", wt_type
, refname
);
181 static void files_ref_path(struct files_ref_store
*refs
,
185 const char *bare_refname
;
188 enum ref_worktree_type wt_type
= parse_worktree_ref(
189 refname
, &wtname
, &wtname_len
, &bare_refname
);
191 case REF_WORKTREE_CURRENT
:
192 strbuf_addf(sb
, "%s/%s", refs
->base
.gitdir
, refname
);
194 case REF_WORKTREE_OTHER
:
195 strbuf_addf(sb
, "%s/worktrees/%.*s/%s", refs
->gitcommondir
,
196 wtname_len
, wtname
, bare_refname
);
198 case REF_WORKTREE_SHARED
:
199 case REF_WORKTREE_MAIN
:
200 strbuf_addf(sb
, "%s/%s", refs
->gitcommondir
, bare_refname
);
203 BUG("unknown ref type %d of ref %s", wt_type
, refname
);
208 * Manually add refs/bisect, refs/rewritten and refs/worktree, which, being
209 * per-worktree, might not appear in the directory listing for
210 * refs/ in the main repo.
212 static void add_per_worktree_entries_to_dir(struct ref_dir
*dir
, const char *dirname
)
214 const char *prefixes
[] = { "refs/bisect/", "refs/worktree/", "refs/rewritten/" };
217 if (strcmp(dirname
, "refs/"))
220 for (ip
= 0; ip
< ARRAY_SIZE(prefixes
); ip
++) {
221 const char *prefix
= prefixes
[ip
];
222 int prefix_len
= strlen(prefix
);
223 struct ref_entry
*child_entry
;
226 pos
= search_ref_dir(dir
, prefix
, prefix_len
);
229 child_entry
= create_dir_entry(dir
->cache
, prefix
, prefix_len
);
230 add_entry_to_dir(dir
, child_entry
);
235 * Read the loose references from the namespace dirname into dir
236 * (without recursing). dirname must end with '/'. dir must be the
237 * directory entry corresponding to dirname.
239 static void loose_fill_ref_dir(struct ref_store
*ref_store
,
240 struct ref_dir
*dir
, const char *dirname
)
242 struct files_ref_store
*refs
=
243 files_downcast(ref_store
, REF_STORE_READ
, "fill_ref_dir");
246 int dirnamelen
= strlen(dirname
);
247 struct strbuf refname
;
248 struct strbuf path
= STRBUF_INIT
;
251 files_ref_path(refs
, &path
, dirname
);
252 path_baselen
= path
.len
;
254 d
= opendir(path
.buf
);
256 strbuf_release(&path
);
260 strbuf_init(&refname
, dirnamelen
+ 257);
261 strbuf_add(&refname
, dirname
, dirnamelen
);
263 while ((de
= readdir(d
)) != NULL
) {
264 struct object_id oid
;
268 if (de
->d_name
[0] == '.')
270 if (ends_with(de
->d_name
, ".lock"))
272 strbuf_addstr(&refname
, de
->d_name
);
273 strbuf_addstr(&path
, de
->d_name
);
274 if (stat(path
.buf
, &st
) < 0) {
275 ; /* silently ignore */
276 } else if (S_ISDIR(st
.st_mode
)) {
277 strbuf_addch(&refname
, '/');
278 add_entry_to_dir(dir
,
279 create_dir_entry(dir
->cache
, refname
.buf
,
282 if (!refs_resolve_ref_unsafe(&refs
->base
,
287 flag
|= REF_ISBROKEN
;
288 } else if (is_null_oid(&oid
)) {
290 * It is so astronomically unlikely
291 * that null_oid is the OID of an
292 * actual object that we consider its
293 * appearance in a loose reference
294 * file to be repo corruption
295 * (probably due to a software bug).
297 flag
|= REF_ISBROKEN
;
300 if (check_refname_format(refname
.buf
,
301 REFNAME_ALLOW_ONELEVEL
)) {
302 if (!refname_is_safe(refname
.buf
))
303 die("loose refname is dangerous: %s", refname
.buf
);
305 flag
|= REF_BAD_NAME
| REF_ISBROKEN
;
307 add_entry_to_dir(dir
,
308 create_ref_entry(refname
.buf
, &oid
, flag
));
310 strbuf_setlen(&refname
, dirnamelen
);
311 strbuf_setlen(&path
, path_baselen
);
313 strbuf_release(&refname
);
314 strbuf_release(&path
);
317 add_per_worktree_entries_to_dir(dir
, dirname
);
320 static struct ref_cache
*get_loose_ref_cache(struct files_ref_store
*refs
)
324 * Mark the top-level directory complete because we
325 * are about to read the only subdirectory that can
328 refs
->loose
= create_ref_cache(&refs
->base
, loose_fill_ref_dir
);
330 /* We're going to fill the top level ourselves: */
331 refs
->loose
->root
->flag
&= ~REF_INCOMPLETE
;
334 * Add an incomplete entry for "refs/" (to be filled
337 add_entry_to_dir(get_ref_dir(refs
->loose
->root
),
338 create_dir_entry(refs
->loose
, "refs/", 5));
343 static int read_ref_internal(struct ref_store
*ref_store
, const char *refname
,
344 struct object_id
*oid
, struct strbuf
*referent
,
345 unsigned int *type
, int *failure_errno
, int skip_packed_refs
)
347 struct files_ref_store
*refs
=
348 files_downcast(ref_store
, REF_STORE_READ
, "read_raw_ref");
349 struct strbuf sb_contents
= STRBUF_INIT
;
350 struct strbuf sb_path
= STRBUF_INIT
;
356 int remaining_retries
= 3;
360 strbuf_reset(&sb_path
);
362 files_ref_path(refs
, &sb_path
, refname
);
368 * We might have to loop back here to avoid a race
369 * condition: first we lstat() the file, then we try
370 * to read it as a link or as a file. But if somebody
371 * changes the type of the file (file <-> directory
372 * <-> symlink) between the lstat() and reading, then
373 * we don't want to report that as an error but rather
374 * try again starting with the lstat().
376 * We'll keep a count of the retries, though, just to avoid
377 * any confusing situation sending us into an infinite loop.
380 if (remaining_retries
-- <= 0)
383 if (lstat(path
, &st
) < 0) {
386 if (myerr
!= ENOENT
|| skip_packed_refs
)
388 if (refs_read_raw_ref(refs
->packed_ref_store
, refname
, oid
,
389 referent
, type
, &ignore_errno
)) {
397 /* Follow "normalized" - ie "refs/.." symlinks by hand */
398 if (S_ISLNK(st
.st_mode
)) {
399 strbuf_reset(&sb_contents
);
400 if (strbuf_readlink(&sb_contents
, path
, st
.st_size
) < 0) {
402 if (myerr
== ENOENT
|| myerr
== EINVAL
)
403 /* inconsistent with lstat; retry */
408 if (starts_with(sb_contents
.buf
, "refs/") &&
409 !check_refname_format(sb_contents
.buf
, 0)) {
410 strbuf_swap(&sb_contents
, referent
);
411 *type
|= REF_ISSYMREF
;
416 * It doesn't look like a refname; fall through to just
417 * treating it like a non-symlink, and reading whatever it
422 /* Is it a directory? */
423 if (S_ISDIR(st
.st_mode
)) {
426 * Even though there is a directory where the loose
427 * ref is supposed to be, there could still be a
430 if (skip_packed_refs
||
431 refs_read_raw_ref(refs
->packed_ref_store
, refname
, oid
,
432 referent
, type
, &ignore_errno
)) {
441 * Anything else, just open it and try to use it as
444 fd
= open(path
, O_RDONLY
);
447 if (myerr
== ENOENT
&& !S_ISLNK(st
.st_mode
))
448 /* inconsistent with lstat; retry */
453 strbuf_reset(&sb_contents
);
454 if (strbuf_read(&sb_contents
, fd
, 256) < 0) {
460 strbuf_rtrim(&sb_contents
);
461 buf
= sb_contents
.buf
;
463 ret
= parse_loose_ref_contents(buf
, oid
, referent
, type
, &myerr
);
467 BUG("returning non-zero %d, should have set myerr!", ret
);
468 *failure_errno
= myerr
;
470 strbuf_release(&sb_path
);
471 strbuf_release(&sb_contents
);
476 static int files_read_raw_ref(struct ref_store
*ref_store
, const char *refname
,
477 struct object_id
*oid
, struct strbuf
*referent
,
478 unsigned int *type
, int *failure_errno
)
480 return read_ref_internal(ref_store
, refname
, oid
, referent
, type
, failure_errno
, 0);
483 static int files_read_symbolic_ref(struct ref_store
*ref_store
, const char *refname
,
484 struct strbuf
*referent
)
486 struct object_id oid
;
487 int failure_errno
, ret
;
490 ret
= read_ref_internal(ref_store
, refname
, &oid
, referent
, &type
, &failure_errno
, 1);
494 return !(type
& REF_ISSYMREF
);
497 int parse_loose_ref_contents(const char *buf
, struct object_id
*oid
,
498 struct strbuf
*referent
, unsigned int *type
,
502 if (skip_prefix(buf
, "ref:", &buf
)) {
503 while (isspace(*buf
))
506 strbuf_reset(referent
);
507 strbuf_addstr(referent
, buf
);
508 *type
|= REF_ISSYMREF
;
513 * FETCH_HEAD has additional data after the sha.
515 if (parse_oid_hex(buf
, oid
, &p
) ||
516 (*p
!= '\0' && !isspace(*p
))) {
517 *type
|= REF_ISBROKEN
;
518 *failure_errno
= EINVAL
;
524 static void unlock_ref(struct ref_lock
*lock
)
526 rollback_lock_file(&lock
->lk
);
527 free(lock
->ref_name
);
532 * Lock refname, without following symrefs, and set *lock_p to point
533 * at a newly-allocated lock object. Fill in lock->old_oid, referent,
534 * and type similarly to read_raw_ref().
536 * The caller must verify that refname is a "safe" reference name (in
537 * the sense of refname_is_safe()) before calling this function.
539 * If the reference doesn't already exist, verify that refname doesn't
540 * have a D/F conflict with any existing references. extras and skip
541 * are passed to refs_verify_refname_available() for this check.
543 * If mustexist is not set and the reference is not found or is
544 * broken, lock the reference anyway but clear old_oid.
546 * Return 0 on success. On failure, write an error message to err and
547 * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR.
549 * Implementation note: This function is basically
554 * but it includes a lot more code to
555 * - Deal with possible races with other processes
556 * - Avoid calling refs_verify_refname_available() when it can be
557 * avoided, namely if we were successfully able to read the ref
558 * - Generate informative error messages in the case of failure
560 static int lock_raw_ref(struct files_ref_store
*refs
,
561 const char *refname
, int mustexist
,
562 const struct string_list
*extras
,
563 struct ref_lock
**lock_p
,
564 struct strbuf
*referent
,
568 struct ref_lock
*lock
;
569 struct strbuf ref_file
= STRBUF_INIT
;
570 int attempts_remaining
= 3;
571 int ret
= TRANSACTION_GENERIC_ERROR
;
575 files_assert_main_repository(refs
, "lock_raw_ref");
579 /* First lock the file so it can't change out from under us. */
581 *lock_p
= CALLOC_ARRAY(lock
, 1);
583 lock
->ref_name
= xstrdup(refname
);
584 files_ref_path(refs
, &ref_file
, refname
);
587 switch (safe_create_leading_directories(ref_file
.buf
)) {
592 * Suppose refname is "refs/foo/bar". We just failed
593 * to create the containing directory, "refs/foo",
594 * because there was a non-directory in the way. This
595 * indicates a D/F conflict, probably because of
596 * another reference such as "refs/foo". There is no
597 * reason to expect this error to be transitory.
599 if (refs_verify_refname_available(&refs
->base
, refname
,
600 extras
, NULL
, err
)) {
603 * To the user the relevant error is
604 * that the "mustexist" reference is
608 strbuf_addf(err
, "unable to resolve reference '%s'",
612 * The error message set by
613 * refs_verify_refname_available() is
616 ret
= TRANSACTION_NAME_CONFLICT
;
620 * The file that is in the way isn't a loose
621 * reference. Report it as a low-level
624 strbuf_addf(err
, "unable to create lock file %s.lock; "
625 "non-directory in the way",
630 /* Maybe another process was tidying up. Try again. */
631 if (--attempts_remaining
> 0)
635 strbuf_addf(err
, "unable to create directory for %s",
640 if (hold_lock_file_for_update_timeout(
641 &lock
->lk
, ref_file
.buf
, LOCK_NO_DEREF
,
642 get_files_ref_lock_timeout_ms()) < 0) {
645 if (myerr
== ENOENT
&& --attempts_remaining
> 0) {
647 * Maybe somebody just deleted one of the
648 * directories leading to ref_file. Try
653 unable_to_lock_message(ref_file
.buf
, myerr
, err
);
659 * Now we hold the lock and can read the reference without
660 * fear that its value will change.
663 if (files_read_raw_ref(&refs
->base
, refname
, &lock
->old_oid
, referent
,
664 type
, &failure_errno
)) {
665 if (failure_errno
== ENOENT
) {
667 /* Garden variety missing reference. */
668 strbuf_addf(err
, "unable to resolve reference '%s'",
673 * Reference is missing, but that's OK. We
674 * know that there is not a conflict with
675 * another loose reference because
676 * (supposing that we are trying to lock
677 * reference "refs/foo/bar"):
679 * - We were successfully able to create
680 * the lockfile refs/foo/bar.lock, so we
681 * know there cannot be a loose reference
684 * - We got ENOENT and not EISDIR, so we
685 * know that there cannot be a loose
686 * reference named "refs/foo/bar/baz".
689 } else if (failure_errno
== EISDIR
) {
691 * There is a directory in the way. It might have
692 * contained references that have been deleted. If
693 * we don't require that the reference already
694 * exists, try to remove the directory so that it
695 * doesn't cause trouble when we want to rename the
696 * lockfile into place later.
699 /* Garden variety missing reference. */
700 strbuf_addf(err
, "unable to resolve reference '%s'",
703 } else if (remove_dir_recursively(&ref_file
,
704 REMOVE_DIR_EMPTY_ONLY
)) {
705 if (refs_verify_refname_available(
706 &refs
->base
, refname
,
707 extras
, NULL
, err
)) {
709 * The error message set by
710 * verify_refname_available() is OK.
712 ret
= TRANSACTION_NAME_CONFLICT
;
716 * We can't delete the directory,
717 * but we also don't know of any
718 * references that it should
721 strbuf_addf(err
, "there is a non-empty directory '%s' "
722 "blocking reference '%s'",
723 ref_file
.buf
, refname
);
727 } else if (failure_errno
== EINVAL
&& (*type
& REF_ISBROKEN
)) {
728 strbuf_addf(err
, "unable to resolve reference '%s': "
729 "reference broken", refname
);
732 strbuf_addf(err
, "unable to resolve reference '%s': %s",
733 refname
, strerror(failure_errno
));
738 * If the ref did not exist and we are creating it,
739 * make sure there is no existing packed ref that
740 * conflicts with refname:
742 if (refs_verify_refname_available(
743 refs
->packed_ref_store
, refname
,
756 strbuf_release(&ref_file
);
760 struct files_ref_iterator
{
761 struct ref_iterator base
;
763 struct ref_iterator
*iter0
;
764 struct repository
*repo
;
768 static int files_ref_iterator_advance(struct ref_iterator
*ref_iterator
)
770 struct files_ref_iterator
*iter
=
771 (struct files_ref_iterator
*)ref_iterator
;
774 while ((ok
= ref_iterator_advance(iter
->iter0
)) == ITER_OK
) {
775 if (iter
->flags
& DO_FOR_EACH_PER_WORKTREE_ONLY
&&
776 parse_worktree_ref(iter
->iter0
->refname
, NULL
, NULL
,
777 NULL
) != REF_WORKTREE_CURRENT
)
780 if ((iter
->flags
& DO_FOR_EACH_OMIT_DANGLING_SYMREFS
) &&
781 (iter
->iter0
->flags
& REF_ISSYMREF
) &&
782 (iter
->iter0
->flags
& REF_ISBROKEN
))
785 if (!(iter
->flags
& DO_FOR_EACH_INCLUDE_BROKEN
) &&
786 !ref_resolves_to_object(iter
->iter0
->refname
,
792 iter
->base
.refname
= iter
->iter0
->refname
;
793 iter
->base
.oid
= iter
->iter0
->oid
;
794 iter
->base
.flags
= iter
->iter0
->flags
;
799 if (ref_iterator_abort(ref_iterator
) != ITER_DONE
)
805 static int files_ref_iterator_peel(struct ref_iterator
*ref_iterator
,
806 struct object_id
*peeled
)
808 struct files_ref_iterator
*iter
=
809 (struct files_ref_iterator
*)ref_iterator
;
811 return ref_iterator_peel(iter
->iter0
, peeled
);
814 static int files_ref_iterator_abort(struct ref_iterator
*ref_iterator
)
816 struct files_ref_iterator
*iter
=
817 (struct files_ref_iterator
*)ref_iterator
;
821 ok
= ref_iterator_abort(iter
->iter0
);
823 base_ref_iterator_free(ref_iterator
);
827 static struct ref_iterator_vtable files_ref_iterator_vtable
= {
828 .advance
= files_ref_iterator_advance
,
829 .peel
= files_ref_iterator_peel
,
830 .abort
= files_ref_iterator_abort
,
833 static struct ref_iterator
*files_ref_iterator_begin(
834 struct ref_store
*ref_store
,
835 const char *prefix
, const char **exclude_patterns
,
838 struct files_ref_store
*refs
;
839 struct ref_iterator
*loose_iter
, *packed_iter
, *overlay_iter
;
840 struct files_ref_iterator
*iter
;
841 struct ref_iterator
*ref_iterator
;
842 unsigned int required_flags
= REF_STORE_READ
;
844 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
))
845 required_flags
|= REF_STORE_ODB
;
847 refs
= files_downcast(ref_store
, required_flags
, "ref_iterator_begin");
850 * We must make sure that all loose refs are read before
851 * accessing the packed-refs file; this avoids a race
852 * condition if loose refs are migrated to the packed-refs
853 * file by a simultaneous process, but our in-memory view is
854 * from before the migration. We ensure this as follows:
855 * First, we call start the loose refs iteration with its
856 * `prime_ref` argument set to true. This causes the loose
857 * references in the subtree to be pre-read into the cache.
858 * (If they've already been read, that's OK; we only need to
859 * guarantee that they're read before the packed refs, not
860 * *how much* before.) After that, we call
861 * packed_ref_iterator_begin(), which internally checks
862 * whether the packed-ref cache is up to date with what is on
863 * disk, and re-reads it if not.
866 loose_iter
= cache_ref_iterator_begin(get_loose_ref_cache(refs
),
867 prefix
, ref_store
->repo
, 1);
870 * The packed-refs file might contain broken references, for
871 * example an old version of a reference that points at an
872 * object that has since been garbage-collected. This is OK as
873 * long as there is a corresponding loose reference that
874 * overrides it, and we don't want to emit an error message in
875 * this case. So ask the packed_ref_store for all of its
876 * references, and (if needed) do our own check for broken
877 * ones in files_ref_iterator_advance(), after we have merged
878 * the packed and loose references.
880 packed_iter
= refs_ref_iterator_begin(
881 refs
->packed_ref_store
, prefix
, exclude_patterns
, 0,
882 DO_FOR_EACH_INCLUDE_BROKEN
);
884 overlay_iter
= overlay_ref_iterator_begin(loose_iter
, packed_iter
);
886 CALLOC_ARRAY(iter
, 1);
887 ref_iterator
= &iter
->base
;
888 base_ref_iterator_init(ref_iterator
, &files_ref_iterator_vtable
,
889 overlay_iter
->ordered
);
890 iter
->iter0
= overlay_iter
;
891 iter
->repo
= ref_store
->repo
;
898 * Callback function for raceproof_create_file(). This function is
899 * expected to do something that makes dirname(path) permanent despite
900 * the fact that other processes might be cleaning up empty
901 * directories at the same time. Usually it will create a file named
902 * path, but alternatively it could create another file in that
903 * directory, or even chdir() into that directory. The function should
904 * return 0 if the action was completed successfully. On error, it
905 * should return a nonzero result and set errno.
906 * raceproof_create_file() treats two errno values specially:
908 * - ENOENT -- dirname(path) does not exist. In this case,
909 * raceproof_create_file() tries creating dirname(path)
910 * (and any parent directories, if necessary) and calls
911 * the function again.
913 * - EISDIR -- the file already exists and is a directory. In this
914 * case, raceproof_create_file() removes the directory if
915 * it is empty (and recursively any empty directories that
916 * it contains) and calls the function again.
918 * Any other errno causes raceproof_create_file() to fail with the
919 * callback's return value and errno.
921 * Obviously, this function should be OK with being called again if it
922 * fails with ENOENT or EISDIR. In other scenarios it will not be
925 typedef int create_file_fn(const char *path
, void *cb
);
928 * Create a file in dirname(path) by calling fn, creating leading
929 * directories if necessary. Retry a few times in case we are racing
930 * with another process that is trying to clean up the directory that
931 * contains path. See the documentation for create_file_fn for more
934 * Return the value and set the errno that resulted from the most
935 * recent call of fn. fn is always called at least once, and will be
936 * called more than once if it returns ENOENT or EISDIR.
938 static int raceproof_create_file(const char *path
, create_file_fn fn
, void *cb
)
941 * The number of times we will try to remove empty directories
942 * in the way of path. This is only 1 because if another
943 * process is racily creating directories that conflict with
944 * us, we don't want to fight against them.
946 int remove_directories_remaining
= 1;
949 * The number of times that we will try to create the
950 * directories containing path. We are willing to attempt this
951 * more than once, because another process could be trying to
952 * clean up empty directories at the same time as we are
953 * trying to create them.
955 int create_directories_remaining
= 3;
957 /* A scratch copy of path, filled lazily if we need it: */
958 struct strbuf path_copy
= STRBUF_INIT
;
971 if (errno
== EISDIR
&& remove_directories_remaining
-- > 0) {
973 * A directory is in the way. Maybe it is empty; try
977 strbuf_addstr(&path_copy
, path
);
979 if (!remove_dir_recursively(&path_copy
, REMOVE_DIR_EMPTY_ONLY
))
981 } else if (errno
== ENOENT
&& create_directories_remaining
-- > 0) {
983 * Maybe the containing directory didn't exist, or
984 * maybe it was just deleted by a process that is
985 * racing with us to clean up empty directories. Try
988 enum scld_error scld_result
;
991 strbuf_addstr(&path_copy
, path
);
994 scld_result
= safe_create_leading_directories(path_copy
.buf
);
995 if (scld_result
== SCLD_OK
)
997 } while (scld_result
== SCLD_VANISHED
&& create_directories_remaining
-- > 0);
1001 strbuf_release(&path_copy
);
1006 static int remove_empty_directories(struct strbuf
*path
)
1009 * we want to create a file but there is a directory there;
1010 * if that is an empty directory (or a directory that contains
1011 * only empty directories), remove them.
1013 return remove_dir_recursively(path
, REMOVE_DIR_EMPTY_ONLY
);
1016 static int create_reflock(const char *path
, void *cb
)
1018 struct lock_file
*lk
= cb
;
1020 return hold_lock_file_for_update_timeout(
1021 lk
, path
, LOCK_NO_DEREF
,
1022 get_files_ref_lock_timeout_ms()) < 0 ? -1 : 0;
1026 * Locks a ref returning the lock on success and NULL on failure.
1028 static struct ref_lock
*lock_ref_oid_basic(struct files_ref_store
*refs
,
1029 const char *refname
,
1032 struct strbuf ref_file
= STRBUF_INIT
;
1033 struct ref_lock
*lock
;
1035 files_assert_main_repository(refs
, "lock_ref_oid_basic");
1038 CALLOC_ARRAY(lock
, 1);
1040 files_ref_path(refs
, &ref_file
, refname
);
1043 * If the ref did not exist and we are creating it, make sure
1044 * there is no existing packed ref whose name begins with our
1045 * refname, nor a packed ref whose name is a proper prefix of
1048 if (is_null_oid(&lock
->old_oid
) &&
1049 refs_verify_refname_available(refs
->packed_ref_store
, refname
,
1053 lock
->ref_name
= xstrdup(refname
);
1055 if (raceproof_create_file(ref_file
.buf
, create_reflock
, &lock
->lk
)) {
1056 unable_to_lock_message(ref_file
.buf
, errno
, err
);
1060 if (!refs_resolve_ref_unsafe(&refs
->base
, lock
->ref_name
, 0,
1061 &lock
->old_oid
, NULL
))
1062 oidclr(&lock
->old_oid
);
1070 strbuf_release(&ref_file
);
1074 struct ref_to_prune
{
1075 struct ref_to_prune
*next
;
1076 struct object_id oid
;
1077 char name
[FLEX_ARRAY
];
1081 REMOVE_EMPTY_PARENTS_REF
= 0x01,
1082 REMOVE_EMPTY_PARENTS_REFLOG
= 0x02
1086 * Remove empty parent directories associated with the specified
1087 * reference and/or its reflog, but spare [logs/]refs/ and immediate
1088 * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or
1089 * REMOVE_EMPTY_PARENTS_REFLOG.
1091 static void try_remove_empty_parents(struct files_ref_store
*refs
,
1092 const char *refname
,
1095 struct strbuf buf
= STRBUF_INIT
;
1096 struct strbuf sb
= STRBUF_INIT
;
1100 strbuf_addstr(&buf
, refname
);
1102 for (i
= 0; i
< 2; i
++) { /* refs/{heads,tags,...}/ */
1103 while (*p
&& *p
!= '/')
1105 /* tolerate duplicate slashes; see check_refname_format() */
1109 q
= buf
.buf
+ buf
.len
;
1110 while (flags
& (REMOVE_EMPTY_PARENTS_REF
| REMOVE_EMPTY_PARENTS_REFLOG
)) {
1111 while (q
> p
&& *q
!= '/')
1113 while (q
> p
&& *(q
-1) == '/')
1117 strbuf_setlen(&buf
, q
- buf
.buf
);
1120 files_ref_path(refs
, &sb
, buf
.buf
);
1121 if ((flags
& REMOVE_EMPTY_PARENTS_REF
) && rmdir(sb
.buf
))
1122 flags
&= ~REMOVE_EMPTY_PARENTS_REF
;
1125 files_reflog_path(refs
, &sb
, buf
.buf
);
1126 if ((flags
& REMOVE_EMPTY_PARENTS_REFLOG
) && rmdir(sb
.buf
))
1127 flags
&= ~REMOVE_EMPTY_PARENTS_REFLOG
;
1129 strbuf_release(&buf
);
1130 strbuf_release(&sb
);
1133 /* make sure nobody touched the ref, and unlink */
1134 static void prune_ref(struct files_ref_store
*refs
, struct ref_to_prune
*r
)
1136 struct ref_transaction
*transaction
;
1137 struct strbuf err
= STRBUF_INIT
;
1140 if (check_refname_format(r
->name
, 0))
1143 transaction
= ref_store_transaction_begin(&refs
->base
, &err
);
1146 ref_transaction_add_update(
1147 transaction
, r
->name
,
1148 REF_NO_DEREF
| REF_HAVE_NEW
| REF_HAVE_OLD
| REF_IS_PRUNING
,
1149 null_oid(), &r
->oid
, NULL
);
1150 if (ref_transaction_commit(transaction
, &err
))
1157 error("%s", err
.buf
);
1158 strbuf_release(&err
);
1159 ref_transaction_free(transaction
);
1164 * Prune the loose versions of the references in the linked list
1165 * `*refs_to_prune`, freeing the entries in the list as we go.
1167 static void prune_refs(struct files_ref_store
*refs
, struct ref_to_prune
**refs_to_prune
)
1169 while (*refs_to_prune
) {
1170 struct ref_to_prune
*r
= *refs_to_prune
;
1171 *refs_to_prune
= r
->next
;
1178 * Return true if the specified reference should be packed.
1180 static int should_pack_ref(const char *refname
,
1181 const struct object_id
*oid
, unsigned int ref_flags
,
1182 struct pack_refs_opts
*opts
)
1184 struct string_list_item
*item
;
1186 /* Do not pack per-worktree refs: */
1187 if (parse_worktree_ref(refname
, NULL
, NULL
, NULL
) !=
1188 REF_WORKTREE_SHARED
)
1191 /* Do not pack symbolic refs: */
1192 if (ref_flags
& REF_ISSYMREF
)
1195 /* Do not pack broken refs: */
1196 if (!ref_resolves_to_object(refname
, the_repository
, oid
, ref_flags
))
1199 if (ref_excluded(opts
->exclusions
, refname
))
1202 for_each_string_list_item(item
, opts
->includes
)
1203 if (!wildmatch(item
->string
, refname
, 0))
1209 static int files_pack_refs(struct ref_store
*ref_store
,
1210 struct pack_refs_opts
*opts
)
1212 struct files_ref_store
*refs
=
1213 files_downcast(ref_store
, REF_STORE_WRITE
| REF_STORE_ODB
,
1215 struct ref_iterator
*iter
;
1217 struct ref_to_prune
*refs_to_prune
= NULL
;
1218 struct strbuf err
= STRBUF_INIT
;
1219 struct ref_transaction
*transaction
;
1221 transaction
= ref_store_transaction_begin(refs
->packed_ref_store
, &err
);
1225 packed_refs_lock(refs
->packed_ref_store
, LOCK_DIE_ON_ERROR
, &err
);
1227 iter
= cache_ref_iterator_begin(get_loose_ref_cache(refs
), NULL
,
1229 while ((ok
= ref_iterator_advance(iter
)) == ITER_OK
) {
1231 * If the loose reference can be packed, add an entry
1232 * in the packed ref cache. If the reference should be
1233 * pruned, also add it to refs_to_prune.
1235 if (!should_pack_ref(iter
->refname
, iter
->oid
, iter
->flags
, opts
))
1239 * Add a reference creation for this reference to the
1240 * packed-refs transaction:
1242 if (ref_transaction_update(transaction
, iter
->refname
,
1244 REF_NO_DEREF
, NULL
, &err
))
1245 die("failure preparing to create packed reference %s: %s",
1246 iter
->refname
, err
.buf
);
1248 /* Schedule the loose reference for pruning if requested. */
1249 if ((opts
->flags
& PACK_REFS_PRUNE
)) {
1250 struct ref_to_prune
*n
;
1251 FLEX_ALLOC_STR(n
, name
, iter
->refname
);
1252 oidcpy(&n
->oid
, iter
->oid
);
1253 n
->next
= refs_to_prune
;
1257 if (ok
!= ITER_DONE
)
1258 die("error while iterating over references");
1260 if (ref_transaction_commit(transaction
, &err
))
1261 die("unable to write new packed-refs: %s", err
.buf
);
1263 ref_transaction_free(transaction
);
1265 packed_refs_unlock(refs
->packed_ref_store
);
1267 prune_refs(refs
, &refs_to_prune
);
1268 strbuf_release(&err
);
1272 static int files_delete_refs(struct ref_store
*ref_store
, const char *msg
,
1273 struct string_list
*refnames
, unsigned int flags
)
1275 struct files_ref_store
*refs
=
1276 files_downcast(ref_store
, REF_STORE_WRITE
, "delete_refs");
1277 struct strbuf err
= STRBUF_INIT
;
1283 if (packed_refs_lock(refs
->packed_ref_store
, 0, &err
))
1286 if (refs_delete_refs(refs
->packed_ref_store
, msg
, refnames
, flags
)) {
1287 packed_refs_unlock(refs
->packed_ref_store
);
1291 packed_refs_unlock(refs
->packed_ref_store
);
1293 for (i
= 0; i
< refnames
->nr
; i
++) {
1294 const char *refname
= refnames
->items
[i
].string
;
1296 if (refs_delete_ref(&refs
->base
, msg
, refname
, NULL
, flags
))
1297 result
|= error(_("could not remove reference %s"), refname
);
1300 strbuf_release(&err
);
1305 * If we failed to rewrite the packed-refs file, then it is
1306 * unsafe to try to remove loose refs, because doing so might
1307 * expose an obsolete packed value for a reference that might
1308 * even point at an object that has been garbage collected.
1310 if (refnames
->nr
== 1)
1311 error(_("could not delete reference %s: %s"),
1312 refnames
->items
[0].string
, err
.buf
);
1314 error(_("could not delete references: %s"), err
.buf
);
1316 strbuf_release(&err
);
1321 * People using contrib's git-new-workdir have .git/logs/refs ->
1322 * /some/other/path/.git/logs/refs, and that may live on another device.
1324 * IOW, to avoid cross device rename errors, the temporary renamed log must
1325 * live into logs/refs.
1327 #define TMP_RENAMED_LOG "refs/.tmp-renamed-log"
1330 const char *tmp_renamed_log
;
1334 static int rename_tmp_log_callback(const char *path
, void *cb_data
)
1336 struct rename_cb
*cb
= cb_data
;
1338 if (rename(cb
->tmp_renamed_log
, path
)) {
1340 * rename(a, b) when b is an existing directory ought
1341 * to result in ISDIR, but Solaris 5.8 gives ENOTDIR.
1342 * Sheesh. Record the true errno for error reporting,
1343 * but report EISDIR to raceproof_create_file() so
1344 * that it knows to retry.
1346 cb
->true_errno
= errno
;
1347 if (errno
== ENOTDIR
)
1355 static int rename_tmp_log(struct files_ref_store
*refs
, const char *newrefname
)
1357 struct strbuf path
= STRBUF_INIT
;
1358 struct strbuf tmp
= STRBUF_INIT
;
1359 struct rename_cb cb
;
1362 files_reflog_path(refs
, &path
, newrefname
);
1363 files_reflog_path(refs
, &tmp
, TMP_RENAMED_LOG
);
1364 cb
.tmp_renamed_log
= tmp
.buf
;
1365 ret
= raceproof_create_file(path
.buf
, rename_tmp_log_callback
, &cb
);
1367 if (errno
== EISDIR
)
1368 error("directory not empty: %s", path
.buf
);
1370 error("unable to move logfile %s to %s: %s",
1372 strerror(cb
.true_errno
));
1375 strbuf_release(&path
);
1376 strbuf_release(&tmp
);
1380 static int write_ref_to_lockfile(struct ref_lock
*lock
,
1381 const struct object_id
*oid
,
1382 int skip_oid_verification
, struct strbuf
*err
);
1383 static int commit_ref_update(struct files_ref_store
*refs
,
1384 struct ref_lock
*lock
,
1385 const struct object_id
*oid
, const char *logmsg
,
1386 struct strbuf
*err
);
1389 * Emit a better error message than lockfile.c's
1390 * unable_to_lock_message() would in case there is a D/F conflict with
1391 * another existing reference. If there would be a conflict, emit an error
1392 * message and return false; otherwise, return true.
1394 * Note that this function is not safe against all races with other
1395 * processes, and that's not its job. We'll emit a more verbose error on D/f
1396 * conflicts if we get past it into lock_ref_oid_basic().
1398 static int refs_rename_ref_available(struct ref_store
*refs
,
1399 const char *old_refname
,
1400 const char *new_refname
)
1402 struct string_list skip
= STRING_LIST_INIT_NODUP
;
1403 struct strbuf err
= STRBUF_INIT
;
1406 string_list_insert(&skip
, old_refname
);
1407 ok
= !refs_verify_refname_available(refs
, new_refname
,
1410 error("%s", err
.buf
);
1412 string_list_clear(&skip
, 0);
1413 strbuf_release(&err
);
1417 static int files_copy_or_rename_ref(struct ref_store
*ref_store
,
1418 const char *oldrefname
, const char *newrefname
,
1419 const char *logmsg
, int copy
)
1421 struct files_ref_store
*refs
=
1422 files_downcast(ref_store
, REF_STORE_WRITE
, "rename_ref");
1423 struct object_id orig_oid
;
1424 int flag
= 0, logmoved
= 0;
1425 struct ref_lock
*lock
;
1426 struct stat loginfo
;
1427 struct strbuf sb_oldref
= STRBUF_INIT
;
1428 struct strbuf sb_newref
= STRBUF_INIT
;
1429 struct strbuf tmp_renamed_log
= STRBUF_INIT
;
1431 struct strbuf err
= STRBUF_INIT
;
1433 files_reflog_path(refs
, &sb_oldref
, oldrefname
);
1434 files_reflog_path(refs
, &sb_newref
, newrefname
);
1435 files_reflog_path(refs
, &tmp_renamed_log
, TMP_RENAMED_LOG
);
1437 log
= !lstat(sb_oldref
.buf
, &loginfo
);
1438 if (log
&& S_ISLNK(loginfo
.st_mode
)) {
1439 ret
= error("reflog for %s is a symlink", oldrefname
);
1443 if (!refs_resolve_ref_unsafe(&refs
->base
, oldrefname
,
1444 RESOLVE_REF_READING
| RESOLVE_REF_NO_RECURSE
,
1445 &orig_oid
, &flag
)) {
1446 ret
= error("refname %s not found", oldrefname
);
1450 if (flag
& REF_ISSYMREF
) {
1452 ret
= error("refname %s is a symbolic ref, copying it is not supported",
1455 ret
= error("refname %s is a symbolic ref, renaming it is not supported",
1459 if (!refs_rename_ref_available(&refs
->base
, oldrefname
, newrefname
)) {
1464 if (!copy
&& log
&& rename(sb_oldref
.buf
, tmp_renamed_log
.buf
)) {
1465 ret
= error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG
": %s",
1466 oldrefname
, strerror(errno
));
1470 if (copy
&& log
&& copy_file(tmp_renamed_log
.buf
, sb_oldref
.buf
, 0644)) {
1471 ret
= error("unable to copy logfile logs/%s to logs/"TMP_RENAMED_LOG
": %s",
1472 oldrefname
, strerror(errno
));
1476 if (!copy
&& refs_delete_ref(&refs
->base
, logmsg
, oldrefname
,
1477 &orig_oid
, REF_NO_DEREF
)) {
1478 error("unable to delete old %s", oldrefname
);
1483 * Since we are doing a shallow lookup, oid is not the
1484 * correct value to pass to delete_ref as old_oid. But that
1485 * doesn't matter, because an old_oid check wouldn't add to
1486 * the safety anyway; we want to delete the reference whatever
1487 * its current value.
1489 if (!copy
&& refs_resolve_ref_unsafe(&refs
->base
, newrefname
,
1490 RESOLVE_REF_READING
| RESOLVE_REF_NO_RECURSE
,
1492 refs_delete_ref(&refs
->base
, NULL
, newrefname
,
1493 NULL
, REF_NO_DEREF
)) {
1494 if (errno
== EISDIR
) {
1495 struct strbuf path
= STRBUF_INIT
;
1498 files_ref_path(refs
, &path
, newrefname
);
1499 result
= remove_empty_directories(&path
);
1500 strbuf_release(&path
);
1503 error("Directory not empty: %s", newrefname
);
1507 error("unable to delete existing %s", newrefname
);
1512 if (log
&& rename_tmp_log(refs
, newrefname
))
1517 lock
= lock_ref_oid_basic(refs
, newrefname
, &err
);
1520 error("unable to copy '%s' to '%s': %s", oldrefname
, newrefname
, err
.buf
);
1522 error("unable to rename '%s' to '%s': %s", oldrefname
, newrefname
, err
.buf
);
1523 strbuf_release(&err
);
1526 oidcpy(&lock
->old_oid
, &orig_oid
);
1528 if (write_ref_to_lockfile(lock
, &orig_oid
, 0, &err
) ||
1529 commit_ref_update(refs
, lock
, &orig_oid
, logmsg
, &err
)) {
1530 error("unable to write current sha1 into %s: %s", newrefname
, err
.buf
);
1531 strbuf_release(&err
);
1539 lock
= lock_ref_oid_basic(refs
, oldrefname
, &err
);
1541 error("unable to lock %s for rollback: %s", oldrefname
, err
.buf
);
1542 strbuf_release(&err
);
1546 flag
= log_all_ref_updates
;
1547 log_all_ref_updates
= LOG_REFS_NONE
;
1548 if (write_ref_to_lockfile(lock
, &orig_oid
, 0, &err
) ||
1549 commit_ref_update(refs
, lock
, &orig_oid
, NULL
, &err
)) {
1550 error("unable to write current sha1 into %s: %s", oldrefname
, err
.buf
);
1551 strbuf_release(&err
);
1553 log_all_ref_updates
= flag
;
1556 if (logmoved
&& rename(sb_newref
.buf
, sb_oldref
.buf
))
1557 error("unable to restore logfile %s from %s: %s",
1558 oldrefname
, newrefname
, strerror(errno
));
1559 if (!logmoved
&& log
&&
1560 rename(tmp_renamed_log
.buf
, sb_oldref
.buf
))
1561 error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG
": %s",
1562 oldrefname
, strerror(errno
));
1565 strbuf_release(&sb_newref
);
1566 strbuf_release(&sb_oldref
);
1567 strbuf_release(&tmp_renamed_log
);
1572 static int files_rename_ref(struct ref_store
*ref_store
,
1573 const char *oldrefname
, const char *newrefname
,
1576 return files_copy_or_rename_ref(ref_store
, oldrefname
,
1577 newrefname
, logmsg
, 0);
1580 static int files_copy_ref(struct ref_store
*ref_store
,
1581 const char *oldrefname
, const char *newrefname
,
1584 return files_copy_or_rename_ref(ref_store
, oldrefname
,
1585 newrefname
, logmsg
, 1);
1588 static int close_ref_gently(struct ref_lock
*lock
)
1590 if (close_lock_file_gently(&lock
->lk
))
1595 static int commit_ref(struct ref_lock
*lock
)
1597 char *path
= get_locked_file_path(&lock
->lk
);
1600 if (!lstat(path
, &st
) && S_ISDIR(st
.st_mode
)) {
1602 * There is a directory at the path we want to rename
1603 * the lockfile to. Hopefully it is empty; try to
1606 size_t len
= strlen(path
);
1607 struct strbuf sb_path
= STRBUF_INIT
;
1609 strbuf_attach(&sb_path
, path
, len
, len
);
1612 * If this fails, commit_lock_file() will also fail
1613 * and will report the problem.
1615 remove_empty_directories(&sb_path
);
1616 strbuf_release(&sb_path
);
1621 if (commit_lock_file(&lock
->lk
))
1626 static int open_or_create_logfile(const char *path
, void *cb
)
1630 *fd
= open(path
, O_APPEND
| O_WRONLY
| O_CREAT
, 0666);
1631 return (*fd
< 0) ? -1 : 0;
1635 * Create a reflog for a ref. If force_create = 0, only create the
1636 * reflog for certain refs (those for which should_autocreate_reflog
1637 * returns non-zero). Otherwise, create it regardless of the reference
1638 * name. If the logfile already existed or was created, return 0 and
1639 * set *logfd to the file descriptor opened for appending to the file.
1640 * If no logfile exists and we decided not to create one, return 0 and
1641 * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and
1644 static int log_ref_setup(struct files_ref_store
*refs
,
1645 const char *refname
, int force_create
,
1646 int *logfd
, struct strbuf
*err
)
1648 struct strbuf logfile_sb
= STRBUF_INIT
;
1651 files_reflog_path(refs
, &logfile_sb
, refname
);
1652 logfile
= strbuf_detach(&logfile_sb
, NULL
);
1654 if (force_create
|| should_autocreate_reflog(refname
)) {
1655 if (raceproof_create_file(logfile
, open_or_create_logfile
, logfd
)) {
1656 if (errno
== ENOENT
)
1657 strbuf_addf(err
, "unable to create directory for '%s': "
1658 "%s", logfile
, strerror(errno
));
1659 else if (errno
== EISDIR
)
1660 strbuf_addf(err
, "there are still logs under '%s'",
1663 strbuf_addf(err
, "unable to append to '%s': %s",
1664 logfile
, strerror(errno
));
1669 *logfd
= open(logfile
, O_APPEND
| O_WRONLY
);
1671 if (errno
== ENOENT
|| errno
== EISDIR
) {
1673 * The logfile doesn't already exist,
1674 * but that is not an error; it only
1675 * means that we won't write log
1680 strbuf_addf(err
, "unable to append to '%s': %s",
1681 logfile
, strerror(errno
));
1688 adjust_shared_perm(logfile
);
1698 static int files_create_reflog(struct ref_store
*ref_store
, const char *refname
,
1701 struct files_ref_store
*refs
=
1702 files_downcast(ref_store
, REF_STORE_WRITE
, "create_reflog");
1705 if (log_ref_setup(refs
, refname
, 1, &fd
, err
))
1714 static int log_ref_write_fd(int fd
, const struct object_id
*old_oid
,
1715 const struct object_id
*new_oid
,
1716 const char *committer
, const char *msg
)
1718 struct strbuf sb
= STRBUF_INIT
;
1721 strbuf_addf(&sb
, "%s %s %s", oid_to_hex(old_oid
), oid_to_hex(new_oid
), committer
);
1723 strbuf_addch(&sb
, '\t');
1724 strbuf_addstr(&sb
, msg
);
1726 strbuf_addch(&sb
, '\n');
1727 if (write_in_full(fd
, sb
.buf
, sb
.len
) < 0)
1729 strbuf_release(&sb
);
1733 static int files_log_ref_write(struct files_ref_store
*refs
,
1734 const char *refname
, const struct object_id
*old_oid
,
1735 const struct object_id
*new_oid
, const char *msg
,
1736 int flags
, struct strbuf
*err
)
1740 if (log_all_ref_updates
== LOG_REFS_UNSET
)
1741 log_all_ref_updates
= is_bare_repository() ? LOG_REFS_NONE
: LOG_REFS_NORMAL
;
1743 result
= log_ref_setup(refs
, refname
,
1744 flags
& REF_FORCE_CREATE_REFLOG
,
1752 result
= log_ref_write_fd(logfd
, old_oid
, new_oid
,
1753 git_committer_info(0), msg
);
1755 struct strbuf sb
= STRBUF_INIT
;
1756 int save_errno
= errno
;
1758 files_reflog_path(refs
, &sb
, refname
);
1759 strbuf_addf(err
, "unable to append to '%s': %s",
1760 sb
.buf
, strerror(save_errno
));
1761 strbuf_release(&sb
);
1766 struct strbuf sb
= STRBUF_INIT
;
1767 int save_errno
= errno
;
1769 files_reflog_path(refs
, &sb
, refname
);
1770 strbuf_addf(err
, "unable to append to '%s': %s",
1771 sb
.buf
, strerror(save_errno
));
1772 strbuf_release(&sb
);
1779 * Write oid into the open lockfile, then close the lockfile. On
1780 * errors, rollback the lockfile, fill in *err and return -1.
1782 static int write_ref_to_lockfile(struct ref_lock
*lock
,
1783 const struct object_id
*oid
,
1784 int skip_oid_verification
, struct strbuf
*err
)
1786 static char term
= '\n';
1790 if (!skip_oid_verification
) {
1791 o
= parse_object(the_repository
, oid
);
1795 "trying to write ref '%s' with nonexistent object %s",
1796 lock
->ref_name
, oid_to_hex(oid
));
1800 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1803 "trying to write non-commit object %s to branch '%s'",
1804 oid_to_hex(oid
), lock
->ref_name
);
1809 fd
= get_lock_file_fd(&lock
->lk
);
1810 if (write_in_full(fd
, oid_to_hex(oid
), the_hash_algo
->hexsz
) < 0 ||
1811 write_in_full(fd
, &term
, 1) < 0 ||
1812 fsync_component(FSYNC_COMPONENT_REFERENCE
, get_lock_file_fd(&lock
->lk
)) < 0 ||
1813 close_ref_gently(lock
) < 0) {
1815 "couldn't write '%s'", get_lock_file_path(&lock
->lk
));
1823 * Commit a change to a loose reference that has already been written
1824 * to the loose reference lockfile. Also update the reflogs if
1825 * necessary, using the specified lockmsg (which can be NULL).
1827 static int commit_ref_update(struct files_ref_store
*refs
,
1828 struct ref_lock
*lock
,
1829 const struct object_id
*oid
, const char *logmsg
,
1832 files_assert_main_repository(refs
, "commit_ref_update");
1834 clear_loose_ref_cache(refs
);
1835 if (files_log_ref_write(refs
, lock
->ref_name
,
1836 &lock
->old_oid
, oid
,
1838 char *old_msg
= strbuf_detach(err
, NULL
);
1839 strbuf_addf(err
, "cannot update the ref '%s': %s",
1840 lock
->ref_name
, old_msg
);
1846 if (strcmp(lock
->ref_name
, "HEAD") != 0) {
1848 * Special hack: If a branch is updated directly and HEAD
1849 * points to it (may happen on the remote side of a push
1850 * for example) then logically the HEAD reflog should be
1852 * A generic solution implies reverse symref information,
1853 * but finding all symrefs pointing to the given branch
1854 * would be rather costly for this rare event (the direct
1855 * update of a branch) to be worth it. So let's cheat and
1856 * check with HEAD only which should cover 99% of all usage
1857 * scenarios (even 100% of the default ones).
1860 const char *head_ref
;
1862 head_ref
= refs_resolve_ref_unsafe(&refs
->base
, "HEAD",
1863 RESOLVE_REF_READING
,
1865 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1866 !strcmp(head_ref
, lock
->ref_name
)) {
1867 struct strbuf log_err
= STRBUF_INIT
;
1868 if (files_log_ref_write(refs
, "HEAD",
1869 &lock
->old_oid
, oid
,
1870 logmsg
, 0, &log_err
)) {
1871 error("%s", log_err
.buf
);
1872 strbuf_release(&log_err
);
1877 if (commit_ref(lock
)) {
1878 strbuf_addf(err
, "couldn't set '%s'", lock
->ref_name
);
1887 static int create_ref_symlink(struct ref_lock
*lock
, const char *target
)
1890 #ifndef NO_SYMLINK_HEAD
1891 char *ref_path
= get_locked_file_path(&lock
->lk
);
1893 ret
= symlink(target
, ref_path
);
1897 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1902 static void update_symref_reflog(struct files_ref_store
*refs
,
1903 struct ref_lock
*lock
, const char *refname
,
1904 const char *target
, const char *logmsg
)
1906 struct strbuf err
= STRBUF_INIT
;
1907 struct object_id new_oid
;
1910 refs_resolve_ref_unsafe(&refs
->base
, target
,
1911 RESOLVE_REF_READING
, &new_oid
, NULL
) &&
1912 files_log_ref_write(refs
, refname
, &lock
->old_oid
,
1913 &new_oid
, logmsg
, 0, &err
)) {
1914 error("%s", err
.buf
);
1915 strbuf_release(&err
);
1919 static int create_symref_locked(struct files_ref_store
*refs
,
1920 struct ref_lock
*lock
, const char *refname
,
1921 const char *target
, const char *logmsg
)
1923 if (prefer_symlink_refs
&& !create_ref_symlink(lock
, target
)) {
1924 update_symref_reflog(refs
, lock
, refname
, target
, logmsg
);
1928 if (!fdopen_lock_file(&lock
->lk
, "w"))
1929 return error("unable to fdopen %s: %s",
1930 get_lock_file_path(&lock
->lk
), strerror(errno
));
1932 update_symref_reflog(refs
, lock
, refname
, target
, logmsg
);
1934 /* no error check; commit_ref will check ferror */
1935 fprintf(get_lock_file_fp(&lock
->lk
), "ref: %s\n", target
);
1936 if (commit_ref(lock
) < 0)
1937 return error("unable to write symref for %s: %s", refname
,
1942 static int files_create_symref(struct ref_store
*ref_store
,
1943 const char *refname
, const char *target
,
1946 struct files_ref_store
*refs
=
1947 files_downcast(ref_store
, REF_STORE_WRITE
, "create_symref");
1948 struct strbuf err
= STRBUF_INIT
;
1949 struct ref_lock
*lock
;
1952 lock
= lock_ref_oid_basic(refs
, refname
, &err
);
1954 error("%s", err
.buf
);
1955 strbuf_release(&err
);
1959 ret
= create_symref_locked(refs
, lock
, refname
, target
, logmsg
);
1964 static int files_reflog_exists(struct ref_store
*ref_store
,
1965 const char *refname
)
1967 struct files_ref_store
*refs
=
1968 files_downcast(ref_store
, REF_STORE_READ
, "reflog_exists");
1969 struct strbuf sb
= STRBUF_INIT
;
1973 files_reflog_path(refs
, &sb
, refname
);
1974 ret
= !lstat(sb
.buf
, &st
) && S_ISREG(st
.st_mode
);
1975 strbuf_release(&sb
);
1979 static int files_delete_reflog(struct ref_store
*ref_store
,
1980 const char *refname
)
1982 struct files_ref_store
*refs
=
1983 files_downcast(ref_store
, REF_STORE_WRITE
, "delete_reflog");
1984 struct strbuf sb
= STRBUF_INIT
;
1987 files_reflog_path(refs
, &sb
, refname
);
1988 ret
= remove_path(sb
.buf
);
1989 strbuf_release(&sb
);
1993 static int show_one_reflog_ent(struct strbuf
*sb
, each_reflog_ent_fn fn
, void *cb_data
)
1995 struct object_id ooid
, noid
;
1996 char *email_end
, *message
;
1997 timestamp_t timestamp
;
1999 const char *p
= sb
->buf
;
2001 /* old SP new SP name <email> SP time TAB msg LF */
2002 if (!sb
->len
|| sb
->buf
[sb
->len
- 1] != '\n' ||
2003 parse_oid_hex(p
, &ooid
, &p
) || *p
++ != ' ' ||
2004 parse_oid_hex(p
, &noid
, &p
) || *p
++ != ' ' ||
2005 !(email_end
= strchr(p
, '>')) ||
2006 email_end
[1] != ' ' ||
2007 !(timestamp
= parse_timestamp(email_end
+ 2, &message
, 10)) ||
2008 !message
|| message
[0] != ' ' ||
2009 (message
[1] != '+' && message
[1] != '-') ||
2010 !isdigit(message
[2]) || !isdigit(message
[3]) ||
2011 !isdigit(message
[4]) || !isdigit(message
[5]))
2012 return 0; /* corrupt? */
2013 email_end
[1] = '\0';
2014 tz
= strtol(message
+ 1, NULL
, 10);
2015 if (message
[6] != '\t')
2019 return fn(&ooid
, &noid
, p
, timestamp
, tz
, message
, cb_data
);
2022 static char *find_beginning_of_line(char *bob
, char *scan
)
2024 while (bob
< scan
&& *(--scan
) != '\n')
2025 ; /* keep scanning backwards */
2027 * Return either beginning of the buffer, or LF at the end of
2028 * the previous line.
2033 static int files_for_each_reflog_ent_reverse(struct ref_store
*ref_store
,
2034 const char *refname
,
2035 each_reflog_ent_fn fn
,
2038 struct files_ref_store
*refs
=
2039 files_downcast(ref_store
, REF_STORE_READ
,
2040 "for_each_reflog_ent_reverse");
2041 struct strbuf sb
= STRBUF_INIT
;
2044 int ret
= 0, at_tail
= 1;
2046 files_reflog_path(refs
, &sb
, refname
);
2047 logfp
= fopen(sb
.buf
, "r");
2048 strbuf_release(&sb
);
2052 /* Jump to the end */
2053 if (fseek(logfp
, 0, SEEK_END
) < 0)
2054 ret
= error("cannot seek back reflog for %s: %s",
2055 refname
, strerror(errno
));
2057 while (!ret
&& 0 < pos
) {
2063 /* Fill next block from the end */
2064 cnt
= (sizeof(buf
) < pos
) ? sizeof(buf
) : pos
;
2065 if (fseek(logfp
, pos
- cnt
, SEEK_SET
)) {
2066 ret
= error("cannot seek back reflog for %s: %s",
2067 refname
, strerror(errno
));
2070 nread
= fread(buf
, cnt
, 1, logfp
);
2072 ret
= error("cannot read %d bytes from reflog for %s: %s",
2073 cnt
, refname
, strerror(errno
));
2078 scanp
= endp
= buf
+ cnt
;
2079 if (at_tail
&& scanp
[-1] == '\n')
2080 /* Looking at the final LF at the end of the file */
2084 while (buf
< scanp
) {
2086 * terminating LF of the previous line, or the beginning
2091 bp
= find_beginning_of_line(buf
, scanp
);
2095 * The newline is the end of the previous line,
2096 * so we know we have complete line starting
2097 * at (bp + 1). Prefix it onto any prior data
2098 * we collected for the line and process it.
2100 strbuf_splice(&sb
, 0, 0, bp
+ 1, endp
- (bp
+ 1));
2103 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2109 * We are at the start of the buffer, and the
2110 * start of the file; there is no previous
2111 * line, and we have everything for this one.
2112 * Process it, and we can end the loop.
2114 strbuf_splice(&sb
, 0, 0, buf
, endp
- buf
);
2115 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2122 * We are at the start of the buffer, and there
2123 * is more file to read backwards. Which means
2124 * we are in the middle of a line. Note that we
2125 * may get here even if *bp was a newline; that
2126 * just means we are at the exact end of the
2127 * previous line, rather than some spot in the
2130 * Save away what we have to be combined with
2131 * the data from the next read.
2133 strbuf_splice(&sb
, 0, 0, buf
, endp
- buf
);
2140 BUG("reverse reflog parser had leftover data");
2143 strbuf_release(&sb
);
2147 static int files_for_each_reflog_ent(struct ref_store
*ref_store
,
2148 const char *refname
,
2149 each_reflog_ent_fn fn
, void *cb_data
)
2151 struct files_ref_store
*refs
=
2152 files_downcast(ref_store
, REF_STORE_READ
,
2153 "for_each_reflog_ent");
2155 struct strbuf sb
= STRBUF_INIT
;
2158 files_reflog_path(refs
, &sb
, refname
);
2159 logfp
= fopen(sb
.buf
, "r");
2160 strbuf_release(&sb
);
2164 while (!ret
&& !strbuf_getwholeline(&sb
, logfp
, '\n'))
2165 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2167 strbuf_release(&sb
);
2171 struct files_reflog_iterator
{
2172 struct ref_iterator base
;
2174 struct ref_store
*ref_store
;
2175 struct dir_iterator
*dir_iterator
;
2176 struct object_id oid
;
2179 static int files_reflog_iterator_advance(struct ref_iterator
*ref_iterator
)
2181 struct files_reflog_iterator
*iter
=
2182 (struct files_reflog_iterator
*)ref_iterator
;
2183 struct dir_iterator
*diter
= iter
->dir_iterator
;
2186 while ((ok
= dir_iterator_advance(diter
)) == ITER_OK
) {
2189 if (!S_ISREG(diter
->st
.st_mode
))
2191 if (diter
->basename
[0] == '.')
2193 if (ends_with(diter
->basename
, ".lock"))
2196 if (!refs_resolve_ref_unsafe(iter
->ref_store
,
2197 diter
->relative_path
, 0,
2198 &iter
->oid
, &flags
)) {
2199 error("bad ref for %s", diter
->path
.buf
);
2203 iter
->base
.refname
= diter
->relative_path
;
2204 iter
->base
.oid
= &iter
->oid
;
2205 iter
->base
.flags
= flags
;
2209 iter
->dir_iterator
= NULL
;
2210 if (ref_iterator_abort(ref_iterator
) == ITER_ERROR
)
2215 static int files_reflog_iterator_peel(struct ref_iterator
*ref_iterator UNUSED
,
2216 struct object_id
*peeled UNUSED
)
2218 BUG("ref_iterator_peel() called for reflog_iterator");
2221 static int files_reflog_iterator_abort(struct ref_iterator
*ref_iterator
)
2223 struct files_reflog_iterator
*iter
=
2224 (struct files_reflog_iterator
*)ref_iterator
;
2227 if (iter
->dir_iterator
)
2228 ok
= dir_iterator_abort(iter
->dir_iterator
);
2230 base_ref_iterator_free(ref_iterator
);
2234 static struct ref_iterator_vtable files_reflog_iterator_vtable
= {
2235 .advance
= files_reflog_iterator_advance
,
2236 .peel
= files_reflog_iterator_peel
,
2237 .abort
= files_reflog_iterator_abort
,
2240 static struct ref_iterator
*reflog_iterator_begin(struct ref_store
*ref_store
,
2243 struct dir_iterator
*diter
;
2244 struct files_reflog_iterator
*iter
;
2245 struct ref_iterator
*ref_iterator
;
2246 struct strbuf sb
= STRBUF_INIT
;
2248 strbuf_addf(&sb
, "%s/logs", gitdir
);
2250 diter
= dir_iterator_begin(sb
.buf
, 0);
2252 strbuf_release(&sb
);
2253 return empty_ref_iterator_begin();
2256 CALLOC_ARRAY(iter
, 1);
2257 ref_iterator
= &iter
->base
;
2259 base_ref_iterator_init(ref_iterator
, &files_reflog_iterator_vtable
, 0);
2260 iter
->dir_iterator
= diter
;
2261 iter
->ref_store
= ref_store
;
2262 strbuf_release(&sb
);
2264 return ref_iterator
;
2267 static enum iterator_selection
reflog_iterator_select(
2268 struct ref_iterator
*iter_worktree
,
2269 struct ref_iterator
*iter_common
,
2270 void *cb_data UNUSED
)
2272 if (iter_worktree
) {
2274 * We're a bit loose here. We probably should ignore
2275 * common refs if they are accidentally added as
2276 * per-worktree refs.
2278 return ITER_SELECT_0
;
2279 } else if (iter_common
) {
2280 if (parse_worktree_ref(iter_common
->refname
, NULL
, NULL
,
2281 NULL
) == REF_WORKTREE_SHARED
)
2282 return ITER_SELECT_1
;
2285 * The main ref store may contain main worktree's
2286 * per-worktree refs, which should be ignored
2293 static struct ref_iterator
*files_reflog_iterator_begin(struct ref_store
*ref_store
)
2295 struct files_ref_store
*refs
=
2296 files_downcast(ref_store
, REF_STORE_READ
,
2297 "reflog_iterator_begin");
2299 if (!strcmp(refs
->base
.gitdir
, refs
->gitcommondir
)) {
2300 return reflog_iterator_begin(ref_store
, refs
->gitcommondir
);
2302 return merge_ref_iterator_begin(
2303 0, reflog_iterator_begin(ref_store
, refs
->base
.gitdir
),
2304 reflog_iterator_begin(ref_store
, refs
->gitcommondir
),
2305 reflog_iterator_select
, refs
);
2310 * If update is a direct update of head_ref (the reference pointed to
2311 * by HEAD), then add an extra REF_LOG_ONLY update for HEAD.
2313 static int split_head_update(struct ref_update
*update
,
2314 struct ref_transaction
*transaction
,
2315 const char *head_ref
,
2316 struct string_list
*affected_refnames
,
2319 struct string_list_item
*item
;
2320 struct ref_update
*new_update
;
2322 if ((update
->flags
& REF_LOG_ONLY
) ||
2323 (update
->flags
& REF_IS_PRUNING
) ||
2324 (update
->flags
& REF_UPDATE_VIA_HEAD
))
2327 if (strcmp(update
->refname
, head_ref
))
2331 * First make sure that HEAD is not already in the
2332 * transaction. This check is O(lg N) in the transaction
2333 * size, but it happens at most once per transaction.
2335 if (string_list_has_string(affected_refnames
, "HEAD")) {
2336 /* An entry already existed */
2338 "multiple updates for 'HEAD' (including one "
2339 "via its referent '%s') are not allowed",
2341 return TRANSACTION_NAME_CONFLICT
;
2344 new_update
= ref_transaction_add_update(
2345 transaction
, "HEAD",
2346 update
->flags
| REF_LOG_ONLY
| REF_NO_DEREF
,
2347 &update
->new_oid
, &update
->old_oid
,
2351 * Add "HEAD". This insertion is O(N) in the transaction
2352 * size, but it happens at most once per transaction.
2353 * Add new_update->refname instead of a literal "HEAD".
2355 if (strcmp(new_update
->refname
, "HEAD"))
2356 BUG("%s unexpectedly not 'HEAD'", new_update
->refname
);
2357 item
= string_list_insert(affected_refnames
, new_update
->refname
);
2358 item
->util
= new_update
;
2364 * update is for a symref that points at referent and doesn't have
2365 * REF_NO_DEREF set. Split it into two updates:
2366 * - The original update, but with REF_LOG_ONLY and REF_NO_DEREF set
2367 * - A new, separate update for the referent reference
2368 * Note that the new update will itself be subject to splitting when
2369 * the iteration gets to it.
2371 static int split_symref_update(struct ref_update
*update
,
2372 const char *referent
,
2373 struct ref_transaction
*transaction
,
2374 struct string_list
*affected_refnames
,
2377 struct string_list_item
*item
;
2378 struct ref_update
*new_update
;
2379 unsigned int new_flags
;
2382 * First make sure that referent is not already in the
2383 * transaction. This check is O(lg N) in the transaction
2384 * size, but it happens at most once per symref in a
2387 if (string_list_has_string(affected_refnames
, referent
)) {
2388 /* An entry already exists */
2390 "multiple updates for '%s' (including one "
2391 "via symref '%s') are not allowed",
2392 referent
, update
->refname
);
2393 return TRANSACTION_NAME_CONFLICT
;
2396 new_flags
= update
->flags
;
2397 if (!strcmp(update
->refname
, "HEAD")) {
2399 * Record that the new update came via HEAD, so that
2400 * when we process it, split_head_update() doesn't try
2401 * to add another reflog update for HEAD. Note that
2402 * this bit will be propagated if the new_update
2403 * itself needs to be split.
2405 new_flags
|= REF_UPDATE_VIA_HEAD
;
2408 new_update
= ref_transaction_add_update(
2409 transaction
, referent
, new_flags
,
2410 &update
->new_oid
, &update
->old_oid
,
2413 new_update
->parent_update
= update
;
2416 * Change the symbolic ref update to log only. Also, it
2417 * doesn't need to check its old OID value, as that will be
2418 * done when new_update is processed.
2420 update
->flags
|= REF_LOG_ONLY
| REF_NO_DEREF
;
2421 update
->flags
&= ~REF_HAVE_OLD
;
2424 * Add the referent. This insertion is O(N) in the transaction
2425 * size, but it happens at most once per symref in a
2426 * transaction. Make sure to add new_update->refname, which will
2427 * be valid as long as affected_refnames is in use, and NOT
2428 * referent, which might soon be freed by our caller.
2430 item
= string_list_insert(affected_refnames
, new_update
->refname
);
2432 BUG("%s unexpectedly found in affected_refnames",
2433 new_update
->refname
);
2434 item
->util
= new_update
;
2440 * Return the refname under which update was originally requested.
2442 static const char *original_update_refname(struct ref_update
*update
)
2444 while (update
->parent_update
)
2445 update
= update
->parent_update
;
2447 return update
->refname
;
2451 * Check whether the REF_HAVE_OLD and old_oid values stored in update
2452 * are consistent with oid, which is the reference's current value. If
2453 * everything is OK, return 0; otherwise, write an error message to
2454 * err and return -1.
2456 static int check_old_oid(struct ref_update
*update
, struct object_id
*oid
,
2459 if (!(update
->flags
& REF_HAVE_OLD
) ||
2460 oideq(oid
, &update
->old_oid
))
2463 if (is_null_oid(&update
->old_oid
))
2464 strbuf_addf(err
, "cannot lock ref '%s': "
2465 "reference already exists",
2466 original_update_refname(update
));
2467 else if (is_null_oid(oid
))
2468 strbuf_addf(err
, "cannot lock ref '%s': "
2469 "reference is missing but expected %s",
2470 original_update_refname(update
),
2471 oid_to_hex(&update
->old_oid
));
2473 strbuf_addf(err
, "cannot lock ref '%s': "
2474 "is at %s but expected %s",
2475 original_update_refname(update
),
2477 oid_to_hex(&update
->old_oid
));
2483 * Prepare for carrying out update:
2484 * - Lock the reference referred to by update.
2485 * - Read the reference under lock.
2486 * - Check that its old OID value (if specified) is correct, and in
2487 * any case record it in update->lock->old_oid for later use when
2488 * writing the reflog.
2489 * - If it is a symref update without REF_NO_DEREF, split it up into a
2490 * REF_LOG_ONLY update of the symref and add a separate update for
2491 * the referent to transaction.
2492 * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY
2495 static int lock_ref_for_update(struct files_ref_store
*refs
,
2496 struct ref_update
*update
,
2497 struct ref_transaction
*transaction
,
2498 const char *head_ref
,
2499 struct string_list
*affected_refnames
,
2502 struct strbuf referent
= STRBUF_INIT
;
2503 int mustexist
= (update
->flags
& REF_HAVE_OLD
) &&
2504 !is_null_oid(&update
->old_oid
);
2506 struct ref_lock
*lock
;
2508 files_assert_main_repository(refs
, "lock_ref_for_update");
2510 if ((update
->flags
& REF_HAVE_NEW
) && is_null_oid(&update
->new_oid
))
2511 update
->flags
|= REF_DELETING
;
2514 ret
= split_head_update(update
, transaction
, head_ref
,
2515 affected_refnames
, err
);
2520 ret
= lock_raw_ref(refs
, update
->refname
, mustexist
,
2523 &update
->type
, err
);
2527 reason
= strbuf_detach(err
, NULL
);
2528 strbuf_addf(err
, "cannot lock ref '%s': %s",
2529 original_update_refname(update
), reason
);
2534 update
->backend_data
= lock
;
2536 if (update
->type
& REF_ISSYMREF
) {
2537 if (update
->flags
& REF_NO_DEREF
) {
2539 * We won't be reading the referent as part of
2540 * the transaction, so we have to read it here
2541 * to record and possibly check old_oid:
2543 if (!refs_resolve_ref_unsafe(&refs
->base
,
2545 &lock
->old_oid
, NULL
)) {
2546 if (update
->flags
& REF_HAVE_OLD
) {
2547 strbuf_addf(err
, "cannot lock ref '%s': "
2548 "error reading reference",
2549 original_update_refname(update
));
2550 ret
= TRANSACTION_GENERIC_ERROR
;
2553 } else if (check_old_oid(update
, &lock
->old_oid
, err
)) {
2554 ret
= TRANSACTION_GENERIC_ERROR
;
2559 * Create a new update for the reference this
2560 * symref is pointing at. Also, we will record
2561 * and verify old_oid for this update as part
2562 * of processing the split-off update, so we
2563 * don't have to do it here.
2565 ret
= split_symref_update(update
,
2566 referent
.buf
, transaction
,
2567 affected_refnames
, err
);
2572 struct ref_update
*parent_update
;
2574 if (check_old_oid(update
, &lock
->old_oid
, err
)) {
2575 ret
= TRANSACTION_GENERIC_ERROR
;
2580 * If this update is happening indirectly because of a
2581 * symref update, record the old OID in the parent
2584 for (parent_update
= update
->parent_update
;
2586 parent_update
= parent_update
->parent_update
) {
2587 struct ref_lock
*parent_lock
= parent_update
->backend_data
;
2588 oidcpy(&parent_lock
->old_oid
, &lock
->old_oid
);
2592 if ((update
->flags
& REF_HAVE_NEW
) &&
2593 !(update
->flags
& REF_DELETING
) &&
2594 !(update
->flags
& REF_LOG_ONLY
)) {
2595 if (!(update
->type
& REF_ISSYMREF
) &&
2596 oideq(&lock
->old_oid
, &update
->new_oid
)) {
2598 * The reference already has the desired
2599 * value, so we don't need to write it.
2601 } else if (write_ref_to_lockfile(
2602 lock
, &update
->new_oid
,
2603 update
->flags
& REF_SKIP_OID_VERIFICATION
,
2605 char *write_err
= strbuf_detach(err
, NULL
);
2608 * The lock was freed upon failure of
2609 * write_ref_to_lockfile():
2611 update
->backend_data
= NULL
;
2613 "cannot update ref '%s': %s",
2614 update
->refname
, write_err
);
2616 ret
= TRANSACTION_GENERIC_ERROR
;
2619 update
->flags
|= REF_NEEDS_COMMIT
;
2622 if (!(update
->flags
& REF_NEEDS_COMMIT
)) {
2624 * We didn't call write_ref_to_lockfile(), so
2625 * the lockfile is still open. Close it to
2626 * free up the file descriptor:
2628 if (close_ref_gently(lock
)) {
2629 strbuf_addf(err
, "couldn't close '%s.lock'",
2631 ret
= TRANSACTION_GENERIC_ERROR
;
2637 strbuf_release(&referent
);
2641 struct files_transaction_backend_data
{
2642 struct ref_transaction
*packed_transaction
;
2643 int packed_refs_locked
;
2647 * Unlock any references in `transaction` that are still locked, and
2648 * mark the transaction closed.
2650 static void files_transaction_cleanup(struct files_ref_store
*refs
,
2651 struct ref_transaction
*transaction
)
2654 struct files_transaction_backend_data
*backend_data
=
2655 transaction
->backend_data
;
2656 struct strbuf err
= STRBUF_INIT
;
2658 for (i
= 0; i
< transaction
->nr
; i
++) {
2659 struct ref_update
*update
= transaction
->updates
[i
];
2660 struct ref_lock
*lock
= update
->backend_data
;
2664 update
->backend_data
= NULL
;
2669 if (backend_data
->packed_transaction
&&
2670 ref_transaction_abort(backend_data
->packed_transaction
, &err
)) {
2671 error("error aborting transaction: %s", err
.buf
);
2672 strbuf_release(&err
);
2675 if (backend_data
->packed_refs_locked
)
2676 packed_refs_unlock(refs
->packed_ref_store
);
2681 transaction
->state
= REF_TRANSACTION_CLOSED
;
2684 static int files_transaction_prepare(struct ref_store
*ref_store
,
2685 struct ref_transaction
*transaction
,
2688 struct files_ref_store
*refs
=
2689 files_downcast(ref_store
, REF_STORE_WRITE
,
2690 "ref_transaction_prepare");
2693 struct string_list affected_refnames
= STRING_LIST_INIT_NODUP
;
2694 char *head_ref
= NULL
;
2696 struct files_transaction_backend_data
*backend_data
;
2697 struct ref_transaction
*packed_transaction
= NULL
;
2701 if (!transaction
->nr
)
2704 CALLOC_ARRAY(backend_data
, 1);
2705 transaction
->backend_data
= backend_data
;
2708 * Fail if a refname appears more than once in the
2709 * transaction. (If we end up splitting up any updates using
2710 * split_symref_update() or split_head_update(), those
2711 * functions will check that the new updates don't have the
2712 * same refname as any existing ones.) Also fail if any of the
2713 * updates use REF_IS_PRUNING without REF_NO_DEREF.
2715 for (i
= 0; i
< transaction
->nr
; i
++) {
2716 struct ref_update
*update
= transaction
->updates
[i
];
2717 struct string_list_item
*item
=
2718 string_list_append(&affected_refnames
, update
->refname
);
2720 if ((update
->flags
& REF_IS_PRUNING
) &&
2721 !(update
->flags
& REF_NO_DEREF
))
2722 BUG("REF_IS_PRUNING set without REF_NO_DEREF");
2725 * We store a pointer to update in item->util, but at
2726 * the moment we never use the value of this field
2727 * except to check whether it is non-NULL.
2729 item
->util
= update
;
2731 string_list_sort(&affected_refnames
);
2732 if (ref_update_reject_duplicates(&affected_refnames
, err
)) {
2733 ret
= TRANSACTION_GENERIC_ERROR
;
2738 * Special hack: If a branch is updated directly and HEAD
2739 * points to it (may happen on the remote side of a push
2740 * for example) then logically the HEAD reflog should be
2743 * A generic solution would require reverse symref lookups,
2744 * but finding all symrefs pointing to a given branch would be
2745 * rather costly for this rare event (the direct update of a
2746 * branch) to be worth it. So let's cheat and check with HEAD
2747 * only, which should cover 99% of all usage scenarios (even
2748 * 100% of the default ones).
2750 * So if HEAD is a symbolic reference, then record the name of
2751 * the reference that it points to. If we see an update of
2752 * head_ref within the transaction, then split_head_update()
2753 * arranges for the reflog of HEAD to be updated, too.
2755 head_ref
= refs_resolve_refdup(ref_store
, "HEAD",
2756 RESOLVE_REF_NO_RECURSE
,
2759 if (head_ref
&& !(head_type
& REF_ISSYMREF
)) {
2760 FREE_AND_NULL(head_ref
);
2764 * Acquire all locks, verify old values if provided, check
2765 * that new values are valid, and write new values to the
2766 * lockfiles, ready to be activated. Only keep one lockfile
2767 * open at a time to avoid running out of file descriptors.
2768 * Note that lock_ref_for_update() might append more updates
2769 * to the transaction.
2771 for (i
= 0; i
< transaction
->nr
; i
++) {
2772 struct ref_update
*update
= transaction
->updates
[i
];
2774 ret
= lock_ref_for_update(refs
, update
, transaction
,
2775 head_ref
, &affected_refnames
, err
);
2779 if (update
->flags
& REF_DELETING
&&
2780 !(update
->flags
& REF_LOG_ONLY
) &&
2781 !(update
->flags
& REF_IS_PRUNING
)) {
2783 * This reference has to be deleted from
2784 * packed-refs if it exists there.
2786 if (!packed_transaction
) {
2787 packed_transaction
= ref_store_transaction_begin(
2788 refs
->packed_ref_store
, err
);
2789 if (!packed_transaction
) {
2790 ret
= TRANSACTION_GENERIC_ERROR
;
2794 backend_data
->packed_transaction
=
2798 ref_transaction_add_update(
2799 packed_transaction
, update
->refname
,
2800 REF_HAVE_NEW
| REF_NO_DEREF
,
2801 &update
->new_oid
, NULL
,
2806 if (packed_transaction
) {
2807 if (packed_refs_lock(refs
->packed_ref_store
, 0, err
)) {
2808 ret
= TRANSACTION_GENERIC_ERROR
;
2811 backend_data
->packed_refs_locked
= 1;
2813 if (is_packed_transaction_needed(refs
->packed_ref_store
,
2814 packed_transaction
)) {
2815 ret
= ref_transaction_prepare(packed_transaction
, err
);
2817 * A failure during the prepare step will abort
2818 * itself, but not free. Do that now, and disconnect
2819 * from the files_transaction so it does not try to
2820 * abort us when we hit the cleanup code below.
2823 ref_transaction_free(packed_transaction
);
2824 backend_data
->packed_transaction
= NULL
;
2828 * We can skip rewriting the `packed-refs`
2829 * file. But we do need to leave it locked, so
2830 * that somebody else doesn't pack a reference
2831 * that we are trying to delete.
2833 * We need to disconnect our transaction from
2834 * backend_data, since the abort (whether successful or
2835 * not) will free it.
2837 backend_data
->packed_transaction
= NULL
;
2838 if (ref_transaction_abort(packed_transaction
, err
)) {
2839 ret
= TRANSACTION_GENERIC_ERROR
;
2847 string_list_clear(&affected_refnames
, 0);
2850 files_transaction_cleanup(refs
, transaction
);
2852 transaction
->state
= REF_TRANSACTION_PREPARED
;
2857 static int files_transaction_finish(struct ref_store
*ref_store
,
2858 struct ref_transaction
*transaction
,
2861 struct files_ref_store
*refs
=
2862 files_downcast(ref_store
, 0, "ref_transaction_finish");
2865 struct strbuf sb
= STRBUF_INIT
;
2866 struct files_transaction_backend_data
*backend_data
;
2867 struct ref_transaction
*packed_transaction
;
2872 if (!transaction
->nr
) {
2873 transaction
->state
= REF_TRANSACTION_CLOSED
;
2877 backend_data
= transaction
->backend_data
;
2878 packed_transaction
= backend_data
->packed_transaction
;
2880 /* Perform updates first so live commits remain referenced */
2881 for (i
= 0; i
< transaction
->nr
; i
++) {
2882 struct ref_update
*update
= transaction
->updates
[i
];
2883 struct ref_lock
*lock
= update
->backend_data
;
2885 if (update
->flags
& REF_NEEDS_COMMIT
||
2886 update
->flags
& REF_LOG_ONLY
) {
2887 if (files_log_ref_write(refs
,
2891 update
->msg
, update
->flags
,
2893 char *old_msg
= strbuf_detach(err
, NULL
);
2895 strbuf_addf(err
, "cannot update the ref '%s': %s",
2896 lock
->ref_name
, old_msg
);
2899 update
->backend_data
= NULL
;
2900 ret
= TRANSACTION_GENERIC_ERROR
;
2904 if (update
->flags
& REF_NEEDS_COMMIT
) {
2905 clear_loose_ref_cache(refs
);
2906 if (commit_ref(lock
)) {
2907 strbuf_addf(err
, "couldn't set '%s'", lock
->ref_name
);
2909 update
->backend_data
= NULL
;
2910 ret
= TRANSACTION_GENERIC_ERROR
;
2917 * Now that updates are safely completed, we can perform
2918 * deletes. First delete the reflogs of any references that
2919 * will be deleted, since (in the unexpected event of an
2920 * error) leaving a reference without a reflog is less bad
2921 * than leaving a reflog without a reference (the latter is a
2922 * mildly invalid repository state):
2924 for (i
= 0; i
< transaction
->nr
; i
++) {
2925 struct ref_update
*update
= transaction
->updates
[i
];
2926 if (update
->flags
& REF_DELETING
&&
2927 !(update
->flags
& REF_LOG_ONLY
) &&
2928 !(update
->flags
& REF_IS_PRUNING
)) {
2930 files_reflog_path(refs
, &sb
, update
->refname
);
2931 if (!unlink_or_warn(sb
.buf
))
2932 try_remove_empty_parents(refs
, update
->refname
,
2933 REMOVE_EMPTY_PARENTS_REFLOG
);
2938 * Perform deletes now that updates are safely completed.
2940 * First delete any packed versions of the references, while
2941 * retaining the packed-refs lock:
2943 if (packed_transaction
) {
2944 ret
= ref_transaction_commit(packed_transaction
, err
);
2945 ref_transaction_free(packed_transaction
);
2946 packed_transaction
= NULL
;
2947 backend_data
->packed_transaction
= NULL
;
2952 /* Now delete the loose versions of the references: */
2953 for (i
= 0; i
< transaction
->nr
; i
++) {
2954 struct ref_update
*update
= transaction
->updates
[i
];
2955 struct ref_lock
*lock
= update
->backend_data
;
2957 if (update
->flags
& REF_DELETING
&&
2958 !(update
->flags
& REF_LOG_ONLY
)) {
2959 update
->flags
|= REF_DELETED_RMDIR
;
2960 if (!(update
->type
& REF_ISPACKED
) ||
2961 update
->type
& REF_ISSYMREF
) {
2962 /* It is a loose reference. */
2964 files_ref_path(refs
, &sb
, lock
->ref_name
);
2965 if (unlink_or_msg(sb
.buf
, err
)) {
2966 ret
= TRANSACTION_GENERIC_ERROR
;
2973 clear_loose_ref_cache(refs
);
2976 files_transaction_cleanup(refs
, transaction
);
2978 for (i
= 0; i
< transaction
->nr
; i
++) {
2979 struct ref_update
*update
= transaction
->updates
[i
];
2981 if (update
->flags
& REF_DELETED_RMDIR
) {
2983 * The reference was deleted. Delete any
2984 * empty parent directories. (Note that this
2985 * can only work because we have already
2986 * removed the lockfile.)
2988 try_remove_empty_parents(refs
, update
->refname
,
2989 REMOVE_EMPTY_PARENTS_REF
);
2993 strbuf_release(&sb
);
2997 static int files_transaction_abort(struct ref_store
*ref_store
,
2998 struct ref_transaction
*transaction
,
2999 struct strbuf
*err UNUSED
)
3001 struct files_ref_store
*refs
=
3002 files_downcast(ref_store
, 0, "ref_transaction_abort");
3004 files_transaction_cleanup(refs
, transaction
);
3008 static int ref_present(const char *refname
,
3009 const struct object_id
*oid UNUSED
,
3013 struct string_list
*affected_refnames
= cb_data
;
3015 return string_list_has_string(affected_refnames
, refname
);
3018 static int files_initial_transaction_commit(struct ref_store
*ref_store
,
3019 struct ref_transaction
*transaction
,
3022 struct files_ref_store
*refs
=
3023 files_downcast(ref_store
, REF_STORE_WRITE
,
3024 "initial_ref_transaction_commit");
3027 struct string_list affected_refnames
= STRING_LIST_INIT_NODUP
;
3028 struct ref_transaction
*packed_transaction
= NULL
;
3032 if (transaction
->state
!= REF_TRANSACTION_OPEN
)
3033 BUG("commit called for transaction that is not open");
3035 /* Fail if a refname appears more than once in the transaction: */
3036 for (i
= 0; i
< transaction
->nr
; i
++)
3037 string_list_append(&affected_refnames
,
3038 transaction
->updates
[i
]->refname
);
3039 string_list_sort(&affected_refnames
);
3040 if (ref_update_reject_duplicates(&affected_refnames
, err
)) {
3041 ret
= TRANSACTION_GENERIC_ERROR
;
3046 * It's really undefined to call this function in an active
3047 * repository or when there are existing references: we are
3048 * only locking and changing packed-refs, so (1) any
3049 * simultaneous processes might try to change a reference at
3050 * the same time we do, and (2) any existing loose versions of
3051 * the references that we are setting would have precedence
3052 * over our values. But some remote helpers create the remote
3053 * "HEAD" and "master" branches before calling this function,
3054 * so here we really only check that none of the references
3055 * that we are creating already exists.
3057 if (refs_for_each_rawref(&refs
->base
, ref_present
,
3058 &affected_refnames
))
3059 BUG("initial ref transaction called with existing refs");
3061 packed_transaction
= ref_store_transaction_begin(refs
->packed_ref_store
, err
);
3062 if (!packed_transaction
) {
3063 ret
= TRANSACTION_GENERIC_ERROR
;
3067 for (i
= 0; i
< transaction
->nr
; i
++) {
3068 struct ref_update
*update
= transaction
->updates
[i
];
3070 if ((update
->flags
& REF_HAVE_OLD
) &&
3071 !is_null_oid(&update
->old_oid
))
3072 BUG("initial ref transaction with old_sha1 set");
3073 if (refs_verify_refname_available(&refs
->base
, update
->refname
,
3074 &affected_refnames
, NULL
,
3076 ret
= TRANSACTION_NAME_CONFLICT
;
3081 * Add a reference creation for this reference to the
3082 * packed-refs transaction:
3084 ref_transaction_add_update(packed_transaction
, update
->refname
,
3085 update
->flags
& ~REF_HAVE_OLD
,
3086 &update
->new_oid
, &update
->old_oid
,
3090 if (packed_refs_lock(refs
->packed_ref_store
, 0, err
)) {
3091 ret
= TRANSACTION_GENERIC_ERROR
;
3095 if (initial_ref_transaction_commit(packed_transaction
, err
)) {
3096 ret
= TRANSACTION_GENERIC_ERROR
;
3099 packed_refs_unlock(refs
->packed_ref_store
);
3101 if (packed_transaction
)
3102 ref_transaction_free(packed_transaction
);
3103 transaction
->state
= REF_TRANSACTION_CLOSED
;
3104 string_list_clear(&affected_refnames
, 0);
3108 struct expire_reflog_cb
{
3109 reflog_expiry_should_prune_fn
*should_prune_fn
;
3112 struct object_id last_kept_oid
;
3113 unsigned int rewrite
:1,
3117 static int expire_reflog_ent(struct object_id
*ooid
, struct object_id
*noid
,
3118 const char *email
, timestamp_t timestamp
, int tz
,
3119 const char *message
, void *cb_data
)
3121 struct expire_reflog_cb
*cb
= cb_data
;
3122 reflog_expiry_should_prune_fn
*fn
= cb
->should_prune_fn
;
3125 ooid
= &cb
->last_kept_oid
;
3127 if (fn(ooid
, noid
, email
, timestamp
, tz
, message
, cb
->policy_cb
))
3131 return 0; /* --dry-run */
3133 fprintf(cb
->newlog
, "%s %s %s %"PRItime
" %+05d\t%s", oid_to_hex(ooid
),
3134 oid_to_hex(noid
), email
, timestamp
, tz
, message
);
3135 oidcpy(&cb
->last_kept_oid
, noid
);
3140 static int files_reflog_expire(struct ref_store
*ref_store
,
3141 const char *refname
,
3142 unsigned int expire_flags
,
3143 reflog_expiry_prepare_fn prepare_fn
,
3144 reflog_expiry_should_prune_fn should_prune_fn
,
3145 reflog_expiry_cleanup_fn cleanup_fn
,
3146 void *policy_cb_data
)
3148 struct files_ref_store
*refs
=
3149 files_downcast(ref_store
, REF_STORE_WRITE
, "reflog_expire");
3150 struct lock_file reflog_lock
= LOCK_INIT
;
3151 struct expire_reflog_cb cb
;
3152 struct ref_lock
*lock
;
3153 struct strbuf log_file_sb
= STRBUF_INIT
;
3156 struct strbuf err
= STRBUF_INIT
;
3157 const struct object_id
*oid
;
3159 memset(&cb
, 0, sizeof(cb
));
3160 cb
.rewrite
= !!(expire_flags
& EXPIRE_REFLOGS_REWRITE
);
3161 cb
.dry_run
= !!(expire_flags
& EXPIRE_REFLOGS_DRY_RUN
);
3162 cb
.policy_cb
= policy_cb_data
;
3163 cb
.should_prune_fn
= should_prune_fn
;
3166 * The reflog file is locked by holding the lock on the
3167 * reference itself, plus we might need to update the
3168 * reference if --updateref was specified:
3170 lock
= lock_ref_oid_basic(refs
, refname
, &err
);
3172 error("cannot lock ref '%s': %s", refname
, err
.buf
);
3173 strbuf_release(&err
);
3176 oid
= &lock
->old_oid
;
3179 * When refs are deleted, their reflog is deleted before the
3180 * ref itself is deleted. This is because there is no separate
3181 * lock for reflog; instead we take a lock on the ref with
3182 * lock_ref_oid_basic().
3184 * If a race happens and the reflog doesn't exist after we've
3185 * acquired the lock that's OK. We've got nothing more to do;
3186 * We were asked to delete the reflog, but someone else
3187 * deleted it! The caller doesn't care that we deleted it,
3188 * just that it is deleted. So we can return successfully.
3190 if (!refs_reflog_exists(ref_store
, refname
)) {
3195 files_reflog_path(refs
, &log_file_sb
, refname
);
3196 log_file
= strbuf_detach(&log_file_sb
, NULL
);
3199 * Even though holding $GIT_DIR/logs/$reflog.lock has
3200 * no locking implications, we use the lock_file
3201 * machinery here anyway because it does a lot of the
3202 * work we need, including cleaning up if the program
3203 * exits unexpectedly.
3205 if (hold_lock_file_for_update(&reflog_lock
, log_file
, 0) < 0) {
3206 struct strbuf err
= STRBUF_INIT
;
3207 unable_to_lock_message(log_file
, errno
, &err
);
3208 error("%s", err
.buf
);
3209 strbuf_release(&err
);
3212 cb
.newlog
= fdopen_lock_file(&reflog_lock
, "w");
3214 error("cannot fdopen %s (%s)",
3215 get_lock_file_path(&reflog_lock
), strerror(errno
));
3220 (*prepare_fn
)(refname
, oid
, cb
.policy_cb
);
3221 refs_for_each_reflog_ent(ref_store
, refname
, expire_reflog_ent
, &cb
);
3222 (*cleanup_fn
)(cb
.policy_cb
);
3226 * It doesn't make sense to adjust a reference pointed
3227 * to by a symbolic ref based on expiring entries in
3228 * the symbolic reference's reflog. Nor can we update
3229 * a reference if there are no remaining reflog
3234 if ((expire_flags
& EXPIRE_REFLOGS_UPDATE_REF
) &&
3235 !is_null_oid(&cb
.last_kept_oid
)) {
3239 ref
= refs_resolve_ref_unsafe(&refs
->base
, refname
,
3240 RESOLVE_REF_NO_RECURSE
,
3242 update
= !!(ref
&& !(type
& REF_ISSYMREF
));
3245 if (close_lock_file_gently(&reflog_lock
)) {
3246 status
|= error("couldn't write %s: %s", log_file
,
3248 rollback_lock_file(&reflog_lock
);
3249 } else if (update
&&
3250 (write_in_full(get_lock_file_fd(&lock
->lk
),
3251 oid_to_hex(&cb
.last_kept_oid
), the_hash_algo
->hexsz
) < 0 ||
3252 write_str_in_full(get_lock_file_fd(&lock
->lk
), "\n") < 0 ||
3253 close_ref_gently(lock
) < 0)) {
3254 status
|= error("couldn't write %s",
3255 get_lock_file_path(&lock
->lk
));
3256 rollback_lock_file(&reflog_lock
);
3257 } else if (commit_lock_file(&reflog_lock
)) {
3258 status
|= error("unable to write reflog '%s' (%s)",
3259 log_file
, strerror(errno
));
3260 } else if (update
&& commit_ref(lock
)) {
3261 status
|= error("couldn't set %s", lock
->ref_name
);
3269 rollback_lock_file(&reflog_lock
);
3275 static int files_init_db(struct ref_store
*ref_store
, struct strbuf
*err UNUSED
)
3277 struct files_ref_store
*refs
=
3278 files_downcast(ref_store
, REF_STORE_WRITE
, "init_db");
3279 struct strbuf sb
= STRBUF_INIT
;
3282 * Create .git/refs/{heads,tags}
3284 files_ref_path(refs
, &sb
, "refs/heads");
3285 safe_create_dir(sb
.buf
, 1);
3288 files_ref_path(refs
, &sb
, "refs/tags");
3289 safe_create_dir(sb
.buf
, 1);
3291 strbuf_release(&sb
);
3295 struct ref_storage_be refs_be_files
= {
3298 .init
= files_ref_store_create
,
3299 .init_db
= files_init_db
,
3300 .transaction_prepare
= files_transaction_prepare
,
3301 .transaction_finish
= files_transaction_finish
,
3302 .transaction_abort
= files_transaction_abort
,
3303 .initial_transaction_commit
= files_initial_transaction_commit
,
3305 .pack_refs
= files_pack_refs
,
3306 .create_symref
= files_create_symref
,
3307 .delete_refs
= files_delete_refs
,
3308 .rename_ref
= files_rename_ref
,
3309 .copy_ref
= files_copy_ref
,
3311 .iterator_begin
= files_ref_iterator_begin
,
3312 .read_raw_ref
= files_read_raw_ref
,
3313 .read_symbolic_ref
= files_read_symbolic_ref
,
3315 .reflog_iterator_begin
= files_reflog_iterator_begin
,
3316 .for_each_reflog_ent
= files_for_each_reflog_ent
,
3317 .for_each_reflog_ent_reverse
= files_for_each_reflog_ent_reverse
,
3318 .reflog_exists
= files_reflog_exists
,
3319 .create_reflog
= files_create_reflog
,
3320 .delete_reflog
= files_delete_reflog
,
3321 .reflog_expire
= files_reflog_expire