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
;
47 * Iff the packed-refs file associated with this instance is
48 * currently locked for writing, this points at the associated
49 * lock (which is owned by somebody else). The referrer count
50 * is also incremented when the file is locked and decremented
51 * when it is unlocked.
53 struct lock_file
*lock
;
55 /* The metadata from when this packed-refs cache was read */
56 struct stat_validity validity
;
60 * Future: need to be in "struct repository"
61 * when doing a full libification.
63 struct files_ref_store
{
64 struct ref_store base
;
65 unsigned int store_flags
;
69 char *packed_refs_path
;
71 struct ref_cache
*loose
;
72 struct packed_ref_cache
*packed
;
75 /* Lock used for the main packed-refs file: */
76 static struct lock_file packlock
;
79 * Increment the reference count of *packed_refs.
81 static void acquire_packed_ref_cache(struct packed_ref_cache
*packed_refs
)
83 packed_refs
->referrers
++;
87 * Decrease the reference count of *packed_refs. If it goes to zero,
88 * free *packed_refs and return true; otherwise return false.
90 static int release_packed_ref_cache(struct packed_ref_cache
*packed_refs
)
92 if (!--packed_refs
->referrers
) {
93 free_ref_cache(packed_refs
->cache
);
94 stat_validity_clear(&packed_refs
->validity
);
102 static void clear_packed_ref_cache(struct files_ref_store
*refs
)
105 struct packed_ref_cache
*packed_refs
= refs
->packed
;
107 if (packed_refs
->lock
)
108 die("internal error: packed-ref cache cleared while locked");
110 release_packed_ref_cache(packed_refs
);
114 static void clear_loose_ref_cache(struct files_ref_store
*refs
)
117 free_ref_cache(refs
->loose
);
123 * Create a new submodule ref cache and add it to the internal
126 static struct ref_store
*files_ref_store_create(const char *gitdir
,
129 struct files_ref_store
*refs
= xcalloc(1, sizeof(*refs
));
130 struct ref_store
*ref_store
= (struct ref_store
*)refs
;
131 struct strbuf sb
= STRBUF_INIT
;
133 base_ref_store_init(ref_store
, &refs_be_files
);
134 refs
->store_flags
= flags
;
136 refs
->gitdir
= xstrdup(gitdir
);
137 get_common_dir_noenv(&sb
, gitdir
);
138 refs
->gitcommondir
= strbuf_detach(&sb
, NULL
);
139 strbuf_addf(&sb
, "%s/packed-refs", refs
->gitcommondir
);
140 refs
->packed_refs_path
= strbuf_detach(&sb
, NULL
);
146 * Die if refs is not the main ref store. caller is used in any
147 * necessary error messages.
149 static void files_assert_main_repository(struct files_ref_store
*refs
,
152 if (refs
->store_flags
& REF_STORE_MAIN
)
155 die("BUG: operation %s only allowed for main ref store", caller
);
159 * Downcast ref_store to files_ref_store. Die if ref_store is not a
160 * files_ref_store. required_flags is compared with ref_store's
161 * store_flags to ensure the ref_store has all required capabilities.
162 * "caller" is used in any necessary error messages.
164 static struct files_ref_store
*files_downcast(struct ref_store
*ref_store
,
165 unsigned int required_flags
,
168 struct files_ref_store
*refs
;
170 if (ref_store
->be
!= &refs_be_files
)
171 die("BUG: ref_store is type \"%s\" not \"files\" in %s",
172 ref_store
->be
->name
, caller
);
174 refs
= (struct files_ref_store
*)ref_store
;
176 if ((refs
->store_flags
& required_flags
) != required_flags
)
177 die("BUG: operation %s requires abilities 0x%x, but only have 0x%x",
178 caller
, required_flags
, refs
->store_flags
);
183 /* The length of a peeled reference line in packed-refs, including EOL: */
184 #define PEELED_LINE_LENGTH 42
187 * The packed-refs header line that we write out. Perhaps other
188 * traits will be added later. The trailing space is required.
190 static const char PACKED_REFS_HEADER
[] =
191 "# pack-refs with: peeled fully-peeled \n";
194 * Parse one line from a packed-refs file. Write the SHA1 to sha1.
195 * Return a pointer to the refname within the line (null-terminated),
196 * or NULL if there was a problem.
198 static const char *parse_ref_line(struct strbuf
*line
, struct object_id
*oid
)
202 if (parse_oid_hex(line
->buf
, oid
, &ref
) < 0)
204 if (!isspace(*ref
++))
210 if (line
->buf
[line
->len
- 1] != '\n')
212 line
->buf
[--line
->len
] = 0;
218 * Read f, which is a packed-refs file, into dir.
220 * A comment line of the form "# pack-refs with: " may contain zero or
221 * more traits. We interpret the traits as follows:
225 * Probably no references are peeled. But if the file contains a
226 * peeled value for a reference, we will use it.
230 * References under "refs/tags/", if they *can* be peeled, *are*
231 * peeled in this file. References outside of "refs/tags/" are
232 * probably not peeled even if they could have been, but if we find
233 * a peeled value for such a reference we will use it.
237 * All references in the file that can be peeled are peeled.
238 * Inversely (and this is more important), any references in the
239 * file for which no peeled value is recorded is not peelable. This
240 * trait should typically be written alongside "peeled" for
241 * compatibility with older clients, but we do not require it
242 * (i.e., "peeled" is a no-op if "fully-peeled" is set).
244 static void read_packed_refs(FILE *f
, struct ref_dir
*dir
)
246 struct ref_entry
*last
= NULL
;
247 struct strbuf line
= STRBUF_INIT
;
248 enum { PEELED_NONE
, PEELED_TAGS
, PEELED_FULLY
} peeled
= PEELED_NONE
;
250 while (strbuf_getwholeline(&line
, f
, '\n') != EOF
) {
251 struct object_id oid
;
255 if (skip_prefix(line
.buf
, "# pack-refs with:", &traits
)) {
256 if (strstr(traits
, " fully-peeled "))
257 peeled
= PEELED_FULLY
;
258 else if (strstr(traits
, " peeled "))
259 peeled
= PEELED_TAGS
;
260 /* perhaps other traits later as well */
264 refname
= parse_ref_line(&line
, &oid
);
266 int flag
= REF_ISPACKED
;
268 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
)) {
269 if (!refname_is_safe(refname
))
270 die("packed refname is dangerous: %s", refname
);
272 flag
|= REF_BAD_NAME
| REF_ISBROKEN
;
274 last
= create_ref_entry(refname
, &oid
, flag
, 0);
275 if (peeled
== PEELED_FULLY
||
276 (peeled
== PEELED_TAGS
&& starts_with(refname
, "refs/tags/")))
277 last
->flag
|= REF_KNOWS_PEELED
;
278 add_ref_entry(dir
, last
);
282 line
.buf
[0] == '^' &&
283 line
.len
== PEELED_LINE_LENGTH
&&
284 line
.buf
[PEELED_LINE_LENGTH
- 1] == '\n' &&
285 !get_oid_hex(line
.buf
+ 1, &oid
)) {
286 oidcpy(&last
->u
.value
.peeled
, &oid
);
288 * Regardless of what the file header said,
289 * we definitely know the value of *this*
292 last
->flag
|= REF_KNOWS_PEELED
;
296 strbuf_release(&line
);
299 static const char *files_packed_refs_path(struct files_ref_store
*refs
)
301 return refs
->packed_refs_path
;
304 static void files_reflog_path(struct files_ref_store
*refs
,
310 * FIXME: of course this is wrong in multi worktree
311 * setting. To be fixed real soon.
313 strbuf_addf(sb
, "%s/logs", refs
->gitcommondir
);
317 switch (ref_type(refname
)) {
318 case REF_TYPE_PER_WORKTREE
:
319 case REF_TYPE_PSEUDOREF
:
320 strbuf_addf(sb
, "%s/logs/%s", refs
->gitdir
, refname
);
322 case REF_TYPE_NORMAL
:
323 strbuf_addf(sb
, "%s/logs/%s", refs
->gitcommondir
, refname
);
326 die("BUG: unknown ref type %d of ref %s",
327 ref_type(refname
), refname
);
331 static void files_ref_path(struct files_ref_store
*refs
,
335 switch (ref_type(refname
)) {
336 case REF_TYPE_PER_WORKTREE
:
337 case REF_TYPE_PSEUDOREF
:
338 strbuf_addf(sb
, "%s/%s", refs
->gitdir
, refname
);
340 case REF_TYPE_NORMAL
:
341 strbuf_addf(sb
, "%s/%s", refs
->gitcommondir
, refname
);
344 die("BUG: unknown ref type %d of ref %s",
345 ref_type(refname
), refname
);
350 * Get the packed_ref_cache for the specified files_ref_store,
351 * creating it if necessary.
353 static struct packed_ref_cache
*get_packed_ref_cache(struct files_ref_store
*refs
)
355 const char *packed_refs_file
= files_packed_refs_path(refs
);
358 !stat_validity_check(&refs
->packed
->validity
, packed_refs_file
))
359 clear_packed_ref_cache(refs
);
364 refs
->packed
= xcalloc(1, sizeof(*refs
->packed
));
365 acquire_packed_ref_cache(refs
->packed
);
366 refs
->packed
->cache
= create_ref_cache(&refs
->base
, NULL
);
367 refs
->packed
->cache
->root
->flag
&= ~REF_INCOMPLETE
;
368 f
= fopen(packed_refs_file
, "r");
370 stat_validity_update(&refs
->packed
->validity
, fileno(f
));
371 read_packed_refs(f
, get_ref_dir(refs
->packed
->cache
->root
));
378 static struct ref_dir
*get_packed_ref_dir(struct packed_ref_cache
*packed_ref_cache
)
380 return get_ref_dir(packed_ref_cache
->cache
->root
);
383 static struct ref_dir
*get_packed_refs(struct files_ref_store
*refs
)
385 return get_packed_ref_dir(get_packed_ref_cache(refs
));
389 * Add a reference to the in-memory packed reference cache. This may
390 * only be called while the packed-refs file is locked (see
391 * lock_packed_refs()). To actually write the packed-refs file, call
392 * commit_packed_refs().
394 static void add_packed_ref(struct files_ref_store
*refs
,
395 const char *refname
, const struct object_id
*oid
)
397 struct packed_ref_cache
*packed_ref_cache
= get_packed_ref_cache(refs
);
399 if (!packed_ref_cache
->lock
)
400 die("internal error: packed refs not locked");
401 add_ref_entry(get_packed_ref_dir(packed_ref_cache
),
402 create_ref_entry(refname
, oid
, REF_ISPACKED
, 1));
406 * Read the loose references from the namespace dirname into dir
407 * (without recursing). dirname must end with '/'. dir must be the
408 * directory entry corresponding to dirname.
410 static void loose_fill_ref_dir(struct ref_store
*ref_store
,
411 struct ref_dir
*dir
, const char *dirname
)
413 struct files_ref_store
*refs
=
414 files_downcast(ref_store
, REF_STORE_READ
, "fill_ref_dir");
417 int dirnamelen
= strlen(dirname
);
418 struct strbuf refname
;
419 struct strbuf path
= STRBUF_INIT
;
422 files_ref_path(refs
, &path
, dirname
);
423 path_baselen
= path
.len
;
425 d
= opendir(path
.buf
);
427 strbuf_release(&path
);
431 strbuf_init(&refname
, dirnamelen
+ 257);
432 strbuf_add(&refname
, dirname
, dirnamelen
);
434 while ((de
= readdir(d
)) != NULL
) {
435 struct object_id oid
;
439 if (de
->d_name
[0] == '.')
441 if (ends_with(de
->d_name
, ".lock"))
443 strbuf_addstr(&refname
, de
->d_name
);
444 strbuf_addstr(&path
, de
->d_name
);
445 if (stat(path
.buf
, &st
) < 0) {
446 ; /* silently ignore */
447 } else if (S_ISDIR(st
.st_mode
)) {
448 strbuf_addch(&refname
, '/');
449 add_entry_to_dir(dir
,
450 create_dir_entry(dir
->cache
, refname
.buf
,
453 if (!refs_resolve_ref_unsafe(&refs
->base
,
458 flag
|= REF_ISBROKEN
;
459 } else if (is_null_oid(&oid
)) {
461 * It is so astronomically unlikely
462 * that NULL_SHA1 is the SHA-1 of an
463 * actual object that we consider its
464 * appearance in a loose reference
465 * file to be repo corruption
466 * (probably due to a software bug).
468 flag
|= REF_ISBROKEN
;
471 if (check_refname_format(refname
.buf
,
472 REFNAME_ALLOW_ONELEVEL
)) {
473 if (!refname_is_safe(refname
.buf
))
474 die("loose refname is dangerous: %s", refname
.buf
);
476 flag
|= REF_BAD_NAME
| REF_ISBROKEN
;
478 add_entry_to_dir(dir
,
479 create_ref_entry(refname
.buf
, &oid
, flag
, 0));
481 strbuf_setlen(&refname
, dirnamelen
);
482 strbuf_setlen(&path
, path_baselen
);
484 strbuf_release(&refname
);
485 strbuf_release(&path
);
489 * Manually add refs/bisect, which, being per-worktree, might
490 * not appear in the directory listing for refs/ in the main
493 if (!strcmp(dirname
, "refs/")) {
494 int pos
= search_ref_dir(dir
, "refs/bisect/", 12);
497 struct ref_entry
*child_entry
= create_dir_entry(
498 dir
->cache
, "refs/bisect/", 12, 1);
499 add_entry_to_dir(dir
, child_entry
);
504 static struct ref_cache
*get_loose_ref_cache(struct files_ref_store
*refs
)
508 * Mark the top-level directory complete because we
509 * are about to read the only subdirectory that can
512 refs
->loose
= create_ref_cache(&refs
->base
, loose_fill_ref_dir
);
514 /* We're going to fill the top level ourselves: */
515 refs
->loose
->root
->flag
&= ~REF_INCOMPLETE
;
518 * Add an incomplete entry for "refs/" (to be filled
521 add_entry_to_dir(get_ref_dir(refs
->loose
->root
),
522 create_dir_entry(refs
->loose
, "refs/", 5, 1));
528 * Return the ref_entry for the given refname from the packed
529 * references. If it does not exist, return NULL.
531 static struct ref_entry
*get_packed_ref(struct files_ref_store
*refs
,
534 return find_ref_entry(get_packed_refs(refs
), refname
);
538 * A loose ref file doesn't exist; check for a packed ref.
540 static int resolve_packed_ref(struct files_ref_store
*refs
,
542 unsigned char *sha1
, unsigned int *flags
)
544 struct ref_entry
*entry
;
547 * The loose reference file does not exist; check for a packed
550 entry
= get_packed_ref(refs
, refname
);
552 hashcpy(sha1
, entry
->u
.value
.oid
.hash
);
553 *flags
|= REF_ISPACKED
;
556 /* refname is not a packed reference. */
560 static int files_read_raw_ref(struct ref_store
*ref_store
,
561 const char *refname
, unsigned char *sha1
,
562 struct strbuf
*referent
, unsigned int *type
)
564 struct files_ref_store
*refs
=
565 files_downcast(ref_store
, REF_STORE_READ
, "read_raw_ref");
566 struct strbuf sb_contents
= STRBUF_INIT
;
567 struct strbuf sb_path
= STRBUF_INIT
;
574 int remaining_retries
= 3;
577 strbuf_reset(&sb_path
);
579 files_ref_path(refs
, &sb_path
, refname
);
585 * We might have to loop back here to avoid a race
586 * condition: first we lstat() the file, then we try
587 * to read it as a link or as a file. But if somebody
588 * changes the type of the file (file <-> directory
589 * <-> symlink) between the lstat() and reading, then
590 * we don't want to report that as an error but rather
591 * try again starting with the lstat().
593 * We'll keep a count of the retries, though, just to avoid
594 * any confusing situation sending us into an infinite loop.
597 if (remaining_retries
-- <= 0)
600 if (lstat(path
, &st
) < 0) {
603 if (resolve_packed_ref(refs
, refname
, sha1
, type
)) {
611 /* Follow "normalized" - ie "refs/.." symlinks by hand */
612 if (S_ISLNK(st
.st_mode
)) {
613 strbuf_reset(&sb_contents
);
614 if (strbuf_readlink(&sb_contents
, path
, 0) < 0) {
615 if (errno
== ENOENT
|| errno
== EINVAL
)
616 /* inconsistent with lstat; retry */
621 if (starts_with(sb_contents
.buf
, "refs/") &&
622 !check_refname_format(sb_contents
.buf
, 0)) {
623 strbuf_swap(&sb_contents
, referent
);
624 *type
|= REF_ISSYMREF
;
629 * It doesn't look like a refname; fall through to just
630 * treating it like a non-symlink, and reading whatever it
635 /* Is it a directory? */
636 if (S_ISDIR(st
.st_mode
)) {
638 * Even though there is a directory where the loose
639 * ref is supposed to be, there could still be a
642 if (resolve_packed_ref(refs
, refname
, sha1
, type
)) {
651 * Anything else, just open it and try to use it as
654 fd
= open(path
, O_RDONLY
);
656 if (errno
== ENOENT
&& !S_ISLNK(st
.st_mode
))
657 /* inconsistent with lstat; retry */
662 strbuf_reset(&sb_contents
);
663 if (strbuf_read(&sb_contents
, fd
, 256) < 0) {
664 int save_errno
= errno
;
670 strbuf_rtrim(&sb_contents
);
671 buf
= sb_contents
.buf
;
672 if (starts_with(buf
, "ref:")) {
674 while (isspace(*buf
))
677 strbuf_reset(referent
);
678 strbuf_addstr(referent
, buf
);
679 *type
|= REF_ISSYMREF
;
685 * Please note that FETCH_HEAD has additional
686 * data after the sha.
688 if (get_sha1_hex(buf
, sha1
) ||
689 (buf
[40] != '\0' && !isspace(buf
[40]))) {
690 *type
|= REF_ISBROKEN
;
699 strbuf_release(&sb_path
);
700 strbuf_release(&sb_contents
);
705 static void unlock_ref(struct ref_lock
*lock
)
707 /* Do not free lock->lk -- atexit() still looks at them */
709 rollback_lock_file(lock
->lk
);
710 free(lock
->ref_name
);
715 * Lock refname, without following symrefs, and set *lock_p to point
716 * at a newly-allocated lock object. Fill in lock->old_oid, referent,
717 * and type similarly to read_raw_ref().
719 * The caller must verify that refname is a "safe" reference name (in
720 * the sense of refname_is_safe()) before calling this function.
722 * If the reference doesn't already exist, verify that refname doesn't
723 * have a D/F conflict with any existing references. extras and skip
724 * are passed to refs_verify_refname_available() for this check.
726 * If mustexist is not set and the reference is not found or is
727 * broken, lock the reference anyway but clear sha1.
729 * Return 0 on success. On failure, write an error message to err and
730 * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR.
732 * Implementation note: This function is basically
737 * but it includes a lot more code to
738 * - Deal with possible races with other processes
739 * - Avoid calling refs_verify_refname_available() when it can be
740 * avoided, namely if we were successfully able to read the ref
741 * - Generate informative error messages in the case of failure
743 static int lock_raw_ref(struct files_ref_store
*refs
,
744 const char *refname
, int mustexist
,
745 const struct string_list
*extras
,
746 const struct string_list
*skip
,
747 struct ref_lock
**lock_p
,
748 struct strbuf
*referent
,
752 struct ref_lock
*lock
;
753 struct strbuf ref_file
= STRBUF_INIT
;
754 int attempts_remaining
= 3;
755 int ret
= TRANSACTION_GENERIC_ERROR
;
758 files_assert_main_repository(refs
, "lock_raw_ref");
762 /* First lock the file so it can't change out from under us. */
764 *lock_p
= lock
= xcalloc(1, sizeof(*lock
));
766 lock
->ref_name
= xstrdup(refname
);
767 files_ref_path(refs
, &ref_file
, refname
);
770 switch (safe_create_leading_directories(ref_file
.buf
)) {
775 * Suppose refname is "refs/foo/bar". We just failed
776 * to create the containing directory, "refs/foo",
777 * because there was a non-directory in the way. This
778 * indicates a D/F conflict, probably because of
779 * another reference such as "refs/foo". There is no
780 * reason to expect this error to be transitory.
782 if (refs_verify_refname_available(&refs
->base
, refname
,
783 extras
, skip
, err
)) {
786 * To the user the relevant error is
787 * that the "mustexist" reference is
791 strbuf_addf(err
, "unable to resolve reference '%s'",
795 * The error message set by
796 * refs_verify_refname_available() is
799 ret
= TRANSACTION_NAME_CONFLICT
;
803 * The file that is in the way isn't a loose
804 * reference. Report it as a low-level
807 strbuf_addf(err
, "unable to create lock file %s.lock; "
808 "non-directory in the way",
813 /* Maybe another process was tidying up. Try again. */
814 if (--attempts_remaining
> 0)
818 strbuf_addf(err
, "unable to create directory for %s",
824 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
826 if (hold_lock_file_for_update(lock
->lk
, ref_file
.buf
, LOCK_NO_DEREF
) < 0) {
827 if (errno
== ENOENT
&& --attempts_remaining
> 0) {
829 * Maybe somebody just deleted one of the
830 * directories leading to ref_file. Try
835 unable_to_lock_message(ref_file
.buf
, errno
, err
);
841 * Now we hold the lock and can read the reference without
842 * fear that its value will change.
845 if (files_read_raw_ref(&refs
->base
, refname
,
846 lock
->old_oid
.hash
, referent
, type
)) {
847 if (errno
== ENOENT
) {
849 /* Garden variety missing reference. */
850 strbuf_addf(err
, "unable to resolve reference '%s'",
855 * Reference is missing, but that's OK. We
856 * know that there is not a conflict with
857 * another loose reference because
858 * (supposing that we are trying to lock
859 * reference "refs/foo/bar"):
861 * - We were successfully able to create
862 * the lockfile refs/foo/bar.lock, so we
863 * know there cannot be a loose reference
866 * - We got ENOENT and not EISDIR, so we
867 * know that there cannot be a loose
868 * reference named "refs/foo/bar/baz".
871 } else if (errno
== EISDIR
) {
873 * There is a directory in the way. It might have
874 * contained references that have been deleted. If
875 * we don't require that the reference already
876 * exists, try to remove the directory so that it
877 * doesn't cause trouble when we want to rename the
878 * lockfile into place later.
881 /* Garden variety missing reference. */
882 strbuf_addf(err
, "unable to resolve reference '%s'",
885 } else if (remove_dir_recursively(&ref_file
,
886 REMOVE_DIR_EMPTY_ONLY
)) {
887 if (refs_verify_refname_available(
888 &refs
->base
, refname
,
889 extras
, skip
, err
)) {
891 * The error message set by
892 * verify_refname_available() is OK.
894 ret
= TRANSACTION_NAME_CONFLICT
;
898 * We can't delete the directory,
899 * but we also don't know of any
900 * references that it should
903 strbuf_addf(err
, "there is a non-empty directory '%s' "
904 "blocking reference '%s'",
905 ref_file
.buf
, refname
);
909 } else if (errno
== EINVAL
&& (*type
& REF_ISBROKEN
)) {
910 strbuf_addf(err
, "unable to resolve reference '%s': "
911 "reference broken", refname
);
914 strbuf_addf(err
, "unable to resolve reference '%s': %s",
915 refname
, strerror(errno
));
920 * If the ref did not exist and we are creating it,
921 * make sure there is no existing ref that conflicts
924 if (refs_verify_refname_available(
925 &refs
->base
, refname
,
938 strbuf_release(&ref_file
);
942 static int files_peel_ref(struct ref_store
*ref_store
,
943 const char *refname
, unsigned char *sha1
)
945 struct files_ref_store
*refs
=
946 files_downcast(ref_store
, REF_STORE_READ
| REF_STORE_ODB
,
949 unsigned char base
[20];
951 if (current_ref_iter
&& current_ref_iter
->refname
== refname
) {
952 struct object_id peeled
;
954 if (ref_iterator_peel(current_ref_iter
, &peeled
))
956 hashcpy(sha1
, peeled
.hash
);
960 if (refs_read_ref_full(ref_store
, refname
,
961 RESOLVE_REF_READING
, base
, &flag
))
965 * If the reference is packed, read its ref_entry from the
966 * cache in the hope that we already know its peeled value.
967 * We only try this optimization on packed references because
968 * (a) forcing the filling of the loose reference cache could
969 * be expensive and (b) loose references anyway usually do not
970 * have REF_KNOWS_PEELED.
972 if (flag
& REF_ISPACKED
) {
973 struct ref_entry
*r
= get_packed_ref(refs
, refname
);
975 if (peel_entry(r
, 0))
977 hashcpy(sha1
, r
->u
.value
.peeled
.hash
);
982 return peel_object(base
, sha1
);
985 struct files_ref_iterator
{
986 struct ref_iterator base
;
988 struct packed_ref_cache
*packed_ref_cache
;
989 struct ref_iterator
*iter0
;
993 static int files_ref_iterator_advance(struct ref_iterator
*ref_iterator
)
995 struct files_ref_iterator
*iter
=
996 (struct files_ref_iterator
*)ref_iterator
;
999 while ((ok
= ref_iterator_advance(iter
->iter0
)) == ITER_OK
) {
1000 if (iter
->flags
& DO_FOR_EACH_PER_WORKTREE_ONLY
&&
1001 ref_type(iter
->iter0
->refname
) != REF_TYPE_PER_WORKTREE
)
1004 if (!(iter
->flags
& DO_FOR_EACH_INCLUDE_BROKEN
) &&
1005 !ref_resolves_to_object(iter
->iter0
->refname
,
1007 iter
->iter0
->flags
))
1010 iter
->base
.refname
= iter
->iter0
->refname
;
1011 iter
->base
.oid
= iter
->iter0
->oid
;
1012 iter
->base
.flags
= iter
->iter0
->flags
;
1017 if (ref_iterator_abort(ref_iterator
) != ITER_DONE
)
1023 static int files_ref_iterator_peel(struct ref_iterator
*ref_iterator
,
1024 struct object_id
*peeled
)
1026 struct files_ref_iterator
*iter
=
1027 (struct files_ref_iterator
*)ref_iterator
;
1029 return ref_iterator_peel(iter
->iter0
, peeled
);
1032 static int files_ref_iterator_abort(struct ref_iterator
*ref_iterator
)
1034 struct files_ref_iterator
*iter
=
1035 (struct files_ref_iterator
*)ref_iterator
;
1039 ok
= ref_iterator_abort(iter
->iter0
);
1041 release_packed_ref_cache(iter
->packed_ref_cache
);
1042 base_ref_iterator_free(ref_iterator
);
1046 static struct ref_iterator_vtable files_ref_iterator_vtable
= {
1047 files_ref_iterator_advance
,
1048 files_ref_iterator_peel
,
1049 files_ref_iterator_abort
1052 static struct ref_iterator
*files_ref_iterator_begin(
1053 struct ref_store
*ref_store
,
1054 const char *prefix
, unsigned int flags
)
1056 struct files_ref_store
*refs
;
1057 struct ref_iterator
*loose_iter
, *packed_iter
;
1058 struct files_ref_iterator
*iter
;
1059 struct ref_iterator
*ref_iterator
;
1061 if (ref_paranoia
< 0)
1062 ref_paranoia
= git_env_bool("GIT_REF_PARANOIA", 0);
1064 flags
|= DO_FOR_EACH_INCLUDE_BROKEN
;
1066 refs
= files_downcast(ref_store
,
1067 REF_STORE_READ
| (ref_paranoia
? 0 : REF_STORE_ODB
),
1068 "ref_iterator_begin");
1070 iter
= xcalloc(1, sizeof(*iter
));
1071 ref_iterator
= &iter
->base
;
1072 base_ref_iterator_init(ref_iterator
, &files_ref_iterator_vtable
);
1075 * We must make sure that all loose refs are read before
1076 * accessing the packed-refs file; this avoids a race
1077 * condition if loose refs are migrated to the packed-refs
1078 * file by a simultaneous process, but our in-memory view is
1079 * from before the migration. We ensure this as follows:
1080 * First, we call start the loose refs iteration with its
1081 * `prime_ref` argument set to true. This causes the loose
1082 * references in the subtree to be pre-read into the cache.
1083 * (If they've already been read, that's OK; we only need to
1084 * guarantee that they're read before the packed refs, not
1085 * *how much* before.) After that, we call
1086 * get_packed_ref_cache(), which internally checks whether the
1087 * packed-ref cache is up to date with what is on disk, and
1088 * re-reads it if not.
1091 loose_iter
= cache_ref_iterator_begin(get_loose_ref_cache(refs
),
1094 iter
->packed_ref_cache
= get_packed_ref_cache(refs
);
1095 acquire_packed_ref_cache(iter
->packed_ref_cache
);
1096 packed_iter
= cache_ref_iterator_begin(iter
->packed_ref_cache
->cache
,
1099 iter
->iter0
= overlay_ref_iterator_begin(loose_iter
, packed_iter
);
1100 iter
->flags
= flags
;
1102 return ref_iterator
;
1106 * Verify that the reference locked by lock has the value old_sha1.
1107 * Fail if the reference doesn't exist and mustexist is set. Return 0
1108 * on success. On error, write an error message to err, set errno, and
1109 * return a negative value.
1111 static int verify_lock(struct ref_store
*ref_store
, struct ref_lock
*lock
,
1112 const unsigned char *old_sha1
, int mustexist
,
1117 if (refs_read_ref_full(ref_store
, lock
->ref_name
,
1118 mustexist
? RESOLVE_REF_READING
: 0,
1119 lock
->old_oid
.hash
, NULL
)) {
1121 int save_errno
= errno
;
1122 strbuf_addf(err
, "can't verify ref '%s'", lock
->ref_name
);
1126 oidclr(&lock
->old_oid
);
1130 if (old_sha1
&& hashcmp(lock
->old_oid
.hash
, old_sha1
)) {
1131 strbuf_addf(err
, "ref '%s' is at %s but expected %s",
1133 oid_to_hex(&lock
->old_oid
),
1134 sha1_to_hex(old_sha1
));
1141 static int remove_empty_directories(struct strbuf
*path
)
1144 * we want to create a file but there is a directory there;
1145 * if that is an empty directory (or a directory that contains
1146 * only empty directories), remove them.
1148 return remove_dir_recursively(path
, REMOVE_DIR_EMPTY_ONLY
);
1151 static int create_reflock(const char *path
, void *cb
)
1153 struct lock_file
*lk
= cb
;
1155 return hold_lock_file_for_update(lk
, path
, LOCK_NO_DEREF
) < 0 ? -1 : 0;
1159 * Locks a ref returning the lock on success and NULL on failure.
1160 * On failure errno is set to something meaningful.
1162 static struct ref_lock
*lock_ref_sha1_basic(struct files_ref_store
*refs
,
1163 const char *refname
,
1164 const unsigned char *old_sha1
,
1165 const struct string_list
*extras
,
1166 const struct string_list
*skip
,
1167 unsigned int flags
, int *type
,
1170 struct strbuf ref_file
= STRBUF_INIT
;
1171 struct ref_lock
*lock
;
1173 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1174 int resolve_flags
= RESOLVE_REF_NO_RECURSE
;
1177 files_assert_main_repository(refs
, "lock_ref_sha1_basic");
1180 lock
= xcalloc(1, sizeof(struct ref_lock
));
1183 resolve_flags
|= RESOLVE_REF_READING
;
1184 if (flags
& REF_DELETING
)
1185 resolve_flags
|= RESOLVE_REF_ALLOW_BAD_NAME
;
1187 files_ref_path(refs
, &ref_file
, refname
);
1188 resolved
= !!refs_resolve_ref_unsafe(&refs
->base
,
1189 refname
, resolve_flags
,
1190 lock
->old_oid
.hash
, type
);
1191 if (!resolved
&& errno
== EISDIR
) {
1193 * we are trying to lock foo but we used to
1194 * have foo/bar which now does not exist;
1195 * it is normal for the empty directory 'foo'
1198 if (remove_empty_directories(&ref_file
)) {
1200 if (!refs_verify_refname_available(
1202 refname
, extras
, skip
, err
))
1203 strbuf_addf(err
, "there are still refs under '%s'",
1207 resolved
= !!refs_resolve_ref_unsafe(&refs
->base
,
1208 refname
, resolve_flags
,
1209 lock
->old_oid
.hash
, type
);
1213 if (last_errno
!= ENOTDIR
||
1214 !refs_verify_refname_available(&refs
->base
, refname
,
1216 strbuf_addf(err
, "unable to resolve reference '%s': %s",
1217 refname
, strerror(last_errno
));
1223 * If the ref did not exist and we are creating it, make sure
1224 * there is no existing packed ref whose name begins with our
1225 * refname, nor a packed ref whose name is a proper prefix of
1228 if (is_null_oid(&lock
->old_oid
) &&
1229 refs_verify_refname_available(&refs
->base
, refname
,
1230 extras
, skip
, err
)) {
1231 last_errno
= ENOTDIR
;
1235 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1237 lock
->ref_name
= xstrdup(refname
);
1239 if (raceproof_create_file(ref_file
.buf
, create_reflock
, lock
->lk
)) {
1241 unable_to_lock_message(ref_file
.buf
, errno
, err
);
1245 if (verify_lock(&refs
->base
, lock
, old_sha1
, mustexist
, err
)) {
1256 strbuf_release(&ref_file
);
1262 * Write an entry to the packed-refs file for the specified refname.
1263 * If peeled is non-NULL, write it as the entry's peeled value.
1265 static void write_packed_entry(FILE *fh
, const char *refname
,
1266 const unsigned char *sha1
,
1267 const unsigned char *peeled
)
1269 fprintf_or_die(fh
, "%s %s\n", sha1_to_hex(sha1
), refname
);
1271 fprintf_or_die(fh
, "^%s\n", sha1_to_hex(peeled
));
1275 * Lock the packed-refs file for writing. Flags is passed to
1276 * hold_lock_file_for_update(). Return 0 on success. On errors, set
1277 * errno appropriately and return a nonzero value.
1279 static int lock_packed_refs(struct files_ref_store
*refs
, int flags
)
1281 static int timeout_configured
= 0;
1282 static int timeout_value
= 1000;
1283 struct packed_ref_cache
*packed_ref_cache
;
1285 files_assert_main_repository(refs
, "lock_packed_refs");
1287 if (!timeout_configured
) {
1288 git_config_get_int("core.packedrefstimeout", &timeout_value
);
1289 timeout_configured
= 1;
1292 if (hold_lock_file_for_update_timeout(
1293 &packlock
, files_packed_refs_path(refs
),
1294 flags
, timeout_value
) < 0)
1297 * Get the current packed-refs while holding the lock. If the
1298 * packed-refs file has been modified since we last read it,
1299 * this will automatically invalidate the cache and re-read
1300 * the packed-refs file.
1302 packed_ref_cache
= get_packed_ref_cache(refs
);
1303 packed_ref_cache
->lock
= &packlock
;
1304 /* Increment the reference count to prevent it from being freed: */
1305 acquire_packed_ref_cache(packed_ref_cache
);
1310 * Write the current version of the packed refs cache from memory to
1311 * disk. The packed-refs file must already be locked for writing (see
1312 * lock_packed_refs()). Return zero on success. On errors, set errno
1313 * and return a nonzero value
1315 static int commit_packed_refs(struct files_ref_store
*refs
)
1317 struct packed_ref_cache
*packed_ref_cache
=
1318 get_packed_ref_cache(refs
);
1322 struct ref_iterator
*iter
;
1324 files_assert_main_repository(refs
, "commit_packed_refs");
1326 if (!packed_ref_cache
->lock
)
1327 die("internal error: packed-refs not locked");
1329 out
= fdopen_lock_file(packed_ref_cache
->lock
, "w");
1331 die_errno("unable to fdopen packed-refs descriptor");
1333 fprintf_or_die(out
, "%s", PACKED_REFS_HEADER
);
1335 iter
= cache_ref_iterator_begin(packed_ref_cache
->cache
, NULL
, 0);
1336 while ((ok
= ref_iterator_advance(iter
)) == ITER_OK
) {
1337 struct object_id peeled
;
1338 int peel_error
= ref_iterator_peel(iter
, &peeled
);
1340 write_packed_entry(out
, iter
->refname
, iter
->oid
->hash
,
1341 peel_error
? NULL
: peeled
.hash
);
1344 if (ok
!= ITER_DONE
)
1345 die("error while iterating over references");
1347 if (commit_lock_file(packed_ref_cache
->lock
)) {
1351 packed_ref_cache
->lock
= NULL
;
1352 release_packed_ref_cache(packed_ref_cache
);
1358 * Rollback the lockfile for the packed-refs file, and discard the
1359 * in-memory packed reference cache. (The packed-refs file will be
1360 * read anew if it is needed again after this function is called.)
1362 static void rollback_packed_refs(struct files_ref_store
*refs
)
1364 struct packed_ref_cache
*packed_ref_cache
=
1365 get_packed_ref_cache(refs
);
1367 files_assert_main_repository(refs
, "rollback_packed_refs");
1369 if (!packed_ref_cache
->lock
)
1370 die("internal error: packed-refs not locked");
1371 rollback_lock_file(packed_ref_cache
->lock
);
1372 packed_ref_cache
->lock
= NULL
;
1373 release_packed_ref_cache(packed_ref_cache
);
1374 clear_packed_ref_cache(refs
);
1377 struct ref_to_prune
{
1378 struct ref_to_prune
*next
;
1379 unsigned char sha1
[20];
1380 char name
[FLEX_ARRAY
];
1384 REMOVE_EMPTY_PARENTS_REF
= 0x01,
1385 REMOVE_EMPTY_PARENTS_REFLOG
= 0x02
1389 * Remove empty parent directories associated with the specified
1390 * reference and/or its reflog, but spare [logs/]refs/ and immediate
1391 * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or
1392 * REMOVE_EMPTY_PARENTS_REFLOG.
1394 static void try_remove_empty_parents(struct files_ref_store
*refs
,
1395 const char *refname
,
1398 struct strbuf buf
= STRBUF_INIT
;
1399 struct strbuf sb
= STRBUF_INIT
;
1403 strbuf_addstr(&buf
, refname
);
1405 for (i
= 0; i
< 2; i
++) { /* refs/{heads,tags,...}/ */
1406 while (*p
&& *p
!= '/')
1408 /* tolerate duplicate slashes; see check_refname_format() */
1412 q
= buf
.buf
+ buf
.len
;
1413 while (flags
& (REMOVE_EMPTY_PARENTS_REF
| REMOVE_EMPTY_PARENTS_REFLOG
)) {
1414 while (q
> p
&& *q
!= '/')
1416 while (q
> p
&& *(q
-1) == '/')
1420 strbuf_setlen(&buf
, q
- buf
.buf
);
1423 files_ref_path(refs
, &sb
, buf
.buf
);
1424 if ((flags
& REMOVE_EMPTY_PARENTS_REF
) && rmdir(sb
.buf
))
1425 flags
&= ~REMOVE_EMPTY_PARENTS_REF
;
1428 files_reflog_path(refs
, &sb
, buf
.buf
);
1429 if ((flags
& REMOVE_EMPTY_PARENTS_REFLOG
) && rmdir(sb
.buf
))
1430 flags
&= ~REMOVE_EMPTY_PARENTS_REFLOG
;
1432 strbuf_release(&buf
);
1433 strbuf_release(&sb
);
1436 /* make sure nobody touched the ref, and unlink */
1437 static void prune_ref(struct files_ref_store
*refs
, struct ref_to_prune
*r
)
1439 struct ref_transaction
*transaction
;
1440 struct strbuf err
= STRBUF_INIT
;
1442 if (check_refname_format(r
->name
, 0))
1445 transaction
= ref_store_transaction_begin(&refs
->base
, &err
);
1447 ref_transaction_delete(transaction
, r
->name
, r
->sha1
,
1448 REF_ISPRUNING
| REF_NODEREF
, NULL
, &err
) ||
1449 ref_transaction_commit(transaction
, &err
)) {
1450 ref_transaction_free(transaction
);
1451 error("%s", err
.buf
);
1452 strbuf_release(&err
);
1455 ref_transaction_free(transaction
);
1456 strbuf_release(&err
);
1459 static void prune_refs(struct files_ref_store
*refs
, struct ref_to_prune
*r
)
1467 static int files_pack_refs(struct ref_store
*ref_store
, unsigned int flags
)
1469 struct files_ref_store
*refs
=
1470 files_downcast(ref_store
, REF_STORE_WRITE
| REF_STORE_ODB
,
1472 struct ref_iterator
*iter
;
1473 struct ref_dir
*packed_refs
;
1475 struct ref_to_prune
*refs_to_prune
= NULL
;
1477 lock_packed_refs(refs
, LOCK_DIE_ON_ERROR
);
1478 packed_refs
= get_packed_refs(refs
);
1480 iter
= cache_ref_iterator_begin(get_loose_ref_cache(refs
), NULL
, 0);
1481 while ((ok
= ref_iterator_advance(iter
)) == ITER_OK
) {
1483 * If the loose reference can be packed, add an entry
1484 * in the packed ref cache. If the reference should be
1485 * pruned, also add it to refs_to_prune.
1487 struct ref_entry
*packed_entry
;
1488 int is_tag_ref
= starts_with(iter
->refname
, "refs/tags/");
1490 /* Do not pack per-worktree refs: */
1491 if (ref_type(iter
->refname
) != REF_TYPE_NORMAL
)
1494 /* ALWAYS pack tags */
1495 if (!(flags
& PACK_REFS_ALL
) && !is_tag_ref
)
1498 /* Do not pack symbolic or broken refs: */
1499 if (iter
->flags
& REF_ISSYMREF
)
1502 if (!ref_resolves_to_object(iter
->refname
, iter
->oid
, iter
->flags
))
1506 * Create an entry in the packed-refs cache equivalent
1507 * to the one from the loose ref cache, except that
1508 * we don't copy the peeled status, because we want it
1511 packed_entry
= find_ref_entry(packed_refs
, iter
->refname
);
1513 /* Overwrite existing packed entry with info from loose entry */
1514 packed_entry
->flag
= REF_ISPACKED
;
1515 oidcpy(&packed_entry
->u
.value
.oid
, iter
->oid
);
1517 packed_entry
= create_ref_entry(iter
->refname
, iter
->oid
,
1519 add_ref_entry(packed_refs
, packed_entry
);
1521 oidclr(&packed_entry
->u
.value
.peeled
);
1523 /* Schedule the loose reference for pruning if requested. */
1524 if ((flags
& PACK_REFS_PRUNE
)) {
1525 struct ref_to_prune
*n
;
1526 FLEX_ALLOC_STR(n
, name
, iter
->refname
);
1527 hashcpy(n
->sha1
, iter
->oid
->hash
);
1528 n
->next
= refs_to_prune
;
1532 if (ok
!= ITER_DONE
)
1533 die("error while iterating over references");
1535 if (commit_packed_refs(refs
))
1536 die_errno("unable to overwrite old ref-pack file");
1538 prune_refs(refs
, refs_to_prune
);
1543 * Rewrite the packed-refs file, omitting any refs listed in
1544 * 'refnames'. On error, leave packed-refs unchanged, write an error
1545 * message to 'err', and return a nonzero value.
1547 * The refs in 'refnames' needn't be sorted. `err` must not be NULL.
1549 static int repack_without_refs(struct files_ref_store
*refs
,
1550 struct string_list
*refnames
, struct strbuf
*err
)
1552 struct ref_dir
*packed
;
1553 struct string_list_item
*refname
;
1554 int ret
, needs_repacking
= 0, removed
= 0;
1556 files_assert_main_repository(refs
, "repack_without_refs");
1559 /* Look for a packed ref */
1560 for_each_string_list_item(refname
, refnames
) {
1561 if (get_packed_ref(refs
, refname
->string
)) {
1562 needs_repacking
= 1;
1567 /* Avoid locking if we have nothing to do */
1568 if (!needs_repacking
)
1569 return 0; /* no refname exists in packed refs */
1571 if (lock_packed_refs(refs
, 0)) {
1572 unable_to_lock_message(files_packed_refs_path(refs
), errno
, err
);
1575 packed
= get_packed_refs(refs
);
1577 /* Remove refnames from the cache */
1578 for_each_string_list_item(refname
, refnames
)
1579 if (remove_entry_from_dir(packed
, refname
->string
) != -1)
1583 * All packed entries disappeared while we were
1584 * acquiring the lock.
1586 rollback_packed_refs(refs
);
1590 /* Write what remains */
1591 ret
= commit_packed_refs(refs
);
1593 strbuf_addf(err
, "unable to overwrite old ref-pack file: %s",
1598 static int files_delete_refs(struct ref_store
*ref_store
,
1599 struct string_list
*refnames
, unsigned int flags
)
1601 struct files_ref_store
*refs
=
1602 files_downcast(ref_store
, REF_STORE_WRITE
, "delete_refs");
1603 struct strbuf err
= STRBUF_INIT
;
1609 result
= repack_without_refs(refs
, refnames
, &err
);
1612 * If we failed to rewrite the packed-refs file, then
1613 * it is unsafe to try to remove loose refs, because
1614 * doing so might expose an obsolete packed value for
1615 * a reference that might even point at an object that
1616 * has been garbage collected.
1618 if (refnames
->nr
== 1)
1619 error(_("could not delete reference %s: %s"),
1620 refnames
->items
[0].string
, err
.buf
);
1622 error(_("could not delete references: %s"), err
.buf
);
1627 for (i
= 0; i
< refnames
->nr
; i
++) {
1628 const char *refname
= refnames
->items
[i
].string
;
1630 if (refs_delete_ref(&refs
->base
, NULL
, refname
, NULL
, flags
))
1631 result
|= error(_("could not remove reference %s"), refname
);
1635 strbuf_release(&err
);
1640 * People using contrib's git-new-workdir have .git/logs/refs ->
1641 * /some/other/path/.git/logs/refs, and that may live on another device.
1643 * IOW, to avoid cross device rename errors, the temporary renamed log must
1644 * live into logs/refs.
1646 #define TMP_RENAMED_LOG "refs/.tmp-renamed-log"
1649 const char *tmp_renamed_log
;
1653 static int rename_tmp_log_callback(const char *path
, void *cb_data
)
1655 struct rename_cb
*cb
= cb_data
;
1657 if (rename(cb
->tmp_renamed_log
, path
)) {
1659 * rename(a, b) when b is an existing directory ought
1660 * to result in ISDIR, but Solaris 5.8 gives ENOTDIR.
1661 * Sheesh. Record the true errno for error reporting,
1662 * but report EISDIR to raceproof_create_file() so
1663 * that it knows to retry.
1665 cb
->true_errno
= errno
;
1666 if (errno
== ENOTDIR
)
1674 static int rename_tmp_log(struct files_ref_store
*refs
, const char *newrefname
)
1676 struct strbuf path
= STRBUF_INIT
;
1677 struct strbuf tmp
= STRBUF_INIT
;
1678 struct rename_cb cb
;
1681 files_reflog_path(refs
, &path
, newrefname
);
1682 files_reflog_path(refs
, &tmp
, TMP_RENAMED_LOG
);
1683 cb
.tmp_renamed_log
= tmp
.buf
;
1684 ret
= raceproof_create_file(path
.buf
, rename_tmp_log_callback
, &cb
);
1686 if (errno
== EISDIR
)
1687 error("directory not empty: %s", path
.buf
);
1689 error("unable to move logfile %s to %s: %s",
1691 strerror(cb
.true_errno
));
1694 strbuf_release(&path
);
1695 strbuf_release(&tmp
);
1699 static int write_ref_to_lockfile(struct ref_lock
*lock
,
1700 const struct object_id
*oid
, struct strbuf
*err
);
1701 static int commit_ref_update(struct files_ref_store
*refs
,
1702 struct ref_lock
*lock
,
1703 const struct object_id
*oid
, const char *logmsg
,
1704 struct strbuf
*err
);
1706 static int files_rename_ref(struct ref_store
*ref_store
,
1707 const char *oldrefname
, const char *newrefname
,
1710 struct files_ref_store
*refs
=
1711 files_downcast(ref_store
, REF_STORE_WRITE
, "rename_ref");
1712 struct object_id oid
, orig_oid
;
1713 int flag
= 0, logmoved
= 0;
1714 struct ref_lock
*lock
;
1715 struct stat loginfo
;
1716 struct strbuf sb_oldref
= STRBUF_INIT
;
1717 struct strbuf sb_newref
= STRBUF_INIT
;
1718 struct strbuf tmp_renamed_log
= STRBUF_INIT
;
1720 struct strbuf err
= STRBUF_INIT
;
1722 files_reflog_path(refs
, &sb_oldref
, oldrefname
);
1723 files_reflog_path(refs
, &sb_newref
, newrefname
);
1724 files_reflog_path(refs
, &tmp_renamed_log
, TMP_RENAMED_LOG
);
1726 log
= !lstat(sb_oldref
.buf
, &loginfo
);
1727 if (log
&& S_ISLNK(loginfo
.st_mode
)) {
1728 ret
= error("reflog for %s is a symlink", oldrefname
);
1732 if (!refs_resolve_ref_unsafe(&refs
->base
, oldrefname
,
1733 RESOLVE_REF_READING
| RESOLVE_REF_NO_RECURSE
,
1734 orig_oid
.hash
, &flag
)) {
1735 ret
= error("refname %s not found", oldrefname
);
1739 if (flag
& REF_ISSYMREF
) {
1740 ret
= error("refname %s is a symbolic ref, renaming it is not supported",
1744 if (!refs_rename_ref_available(&refs
->base
, oldrefname
, newrefname
)) {
1749 if (log
&& rename(sb_oldref
.buf
, tmp_renamed_log
.buf
)) {
1750 ret
= error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG
": %s",
1751 oldrefname
, strerror(errno
));
1755 if (refs_delete_ref(&refs
->base
, logmsg
, oldrefname
,
1756 orig_oid
.hash
, REF_NODEREF
)) {
1757 error("unable to delete old %s", oldrefname
);
1762 * Since we are doing a shallow lookup, oid is not the
1763 * correct value to pass to delete_ref as old_oid. But that
1764 * doesn't matter, because an old_oid check wouldn't add to
1765 * the safety anyway; we want to delete the reference whatever
1766 * its current value.
1768 if (!refs_read_ref_full(&refs
->base
, newrefname
,
1769 RESOLVE_REF_READING
| RESOLVE_REF_NO_RECURSE
,
1771 refs_delete_ref(&refs
->base
, NULL
, newrefname
,
1772 NULL
, REF_NODEREF
)) {
1773 if (errno
== EISDIR
) {
1774 struct strbuf path
= STRBUF_INIT
;
1777 files_ref_path(refs
, &path
, newrefname
);
1778 result
= remove_empty_directories(&path
);
1779 strbuf_release(&path
);
1782 error("Directory not empty: %s", newrefname
);
1786 error("unable to delete existing %s", newrefname
);
1791 if (log
&& rename_tmp_log(refs
, newrefname
))
1796 lock
= lock_ref_sha1_basic(refs
, newrefname
, NULL
, NULL
, NULL
,
1797 REF_NODEREF
, NULL
, &err
);
1799 error("unable to rename '%s' to '%s': %s", oldrefname
, newrefname
, err
.buf
);
1800 strbuf_release(&err
);
1803 oidcpy(&lock
->old_oid
, &orig_oid
);
1805 if (write_ref_to_lockfile(lock
, &orig_oid
, &err
) ||
1806 commit_ref_update(refs
, lock
, &orig_oid
, logmsg
, &err
)) {
1807 error("unable to write current sha1 into %s: %s", newrefname
, err
.buf
);
1808 strbuf_release(&err
);
1816 lock
= lock_ref_sha1_basic(refs
, oldrefname
, NULL
, NULL
, NULL
,
1817 REF_NODEREF
, NULL
, &err
);
1819 error("unable to lock %s for rollback: %s", oldrefname
, err
.buf
);
1820 strbuf_release(&err
);
1824 flag
= log_all_ref_updates
;
1825 log_all_ref_updates
= LOG_REFS_NONE
;
1826 if (write_ref_to_lockfile(lock
, &orig_oid
, &err
) ||
1827 commit_ref_update(refs
, lock
, &orig_oid
, NULL
, &err
)) {
1828 error("unable to write current sha1 into %s: %s", oldrefname
, err
.buf
);
1829 strbuf_release(&err
);
1831 log_all_ref_updates
= flag
;
1834 if (logmoved
&& rename(sb_newref
.buf
, sb_oldref
.buf
))
1835 error("unable to restore logfile %s from %s: %s",
1836 oldrefname
, newrefname
, strerror(errno
));
1837 if (!logmoved
&& log
&&
1838 rename(tmp_renamed_log
.buf
, sb_oldref
.buf
))
1839 error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG
": %s",
1840 oldrefname
, strerror(errno
));
1843 strbuf_release(&sb_newref
);
1844 strbuf_release(&sb_oldref
);
1845 strbuf_release(&tmp_renamed_log
);
1850 static int close_ref(struct ref_lock
*lock
)
1852 if (close_lock_file(lock
->lk
))
1857 static int commit_ref(struct ref_lock
*lock
)
1859 char *path
= get_locked_file_path(lock
->lk
);
1862 if (!lstat(path
, &st
) && S_ISDIR(st
.st_mode
)) {
1864 * There is a directory at the path we want to rename
1865 * the lockfile to. Hopefully it is empty; try to
1868 size_t len
= strlen(path
);
1869 struct strbuf sb_path
= STRBUF_INIT
;
1871 strbuf_attach(&sb_path
, path
, len
, len
);
1874 * If this fails, commit_lock_file() will also fail
1875 * and will report the problem.
1877 remove_empty_directories(&sb_path
);
1878 strbuf_release(&sb_path
);
1883 if (commit_lock_file(lock
->lk
))
1888 static int open_or_create_logfile(const char *path
, void *cb
)
1892 *fd
= open(path
, O_APPEND
| O_WRONLY
| O_CREAT
, 0666);
1893 return (*fd
< 0) ? -1 : 0;
1897 * Create a reflog for a ref. If force_create = 0, only create the
1898 * reflog for certain refs (those for which should_autocreate_reflog
1899 * returns non-zero). Otherwise, create it regardless of the reference
1900 * name. If the logfile already existed or was created, return 0 and
1901 * set *logfd to the file descriptor opened for appending to the file.
1902 * If no logfile exists and we decided not to create one, return 0 and
1903 * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and
1906 static int log_ref_setup(struct files_ref_store
*refs
,
1907 const char *refname
, int force_create
,
1908 int *logfd
, struct strbuf
*err
)
1910 struct strbuf logfile_sb
= STRBUF_INIT
;
1913 files_reflog_path(refs
, &logfile_sb
, refname
);
1914 logfile
= strbuf_detach(&logfile_sb
, NULL
);
1916 if (force_create
|| should_autocreate_reflog(refname
)) {
1917 if (raceproof_create_file(logfile
, open_or_create_logfile
, logfd
)) {
1918 if (errno
== ENOENT
)
1919 strbuf_addf(err
, "unable to create directory for '%s': "
1920 "%s", logfile
, strerror(errno
));
1921 else if (errno
== EISDIR
)
1922 strbuf_addf(err
, "there are still logs under '%s'",
1925 strbuf_addf(err
, "unable to append to '%s': %s",
1926 logfile
, strerror(errno
));
1931 *logfd
= open(logfile
, O_APPEND
| O_WRONLY
, 0666);
1933 if (errno
== ENOENT
|| errno
== EISDIR
) {
1935 * The logfile doesn't already exist,
1936 * but that is not an error; it only
1937 * means that we won't write log
1942 strbuf_addf(err
, "unable to append to '%s': %s",
1943 logfile
, strerror(errno
));
1950 adjust_shared_perm(logfile
);
1960 static int files_create_reflog(struct ref_store
*ref_store
,
1961 const char *refname
, int force_create
,
1964 struct files_ref_store
*refs
=
1965 files_downcast(ref_store
, REF_STORE_WRITE
, "create_reflog");
1968 if (log_ref_setup(refs
, refname
, force_create
, &fd
, err
))
1977 static int log_ref_write_fd(int fd
, const struct object_id
*old_oid
,
1978 const struct object_id
*new_oid
,
1979 const char *committer
, const char *msg
)
1981 int msglen
, written
;
1982 unsigned maxlen
, len
;
1985 msglen
= msg
? strlen(msg
) : 0;
1986 maxlen
= strlen(committer
) + msglen
+ 100;
1987 logrec
= xmalloc(maxlen
);
1988 len
= xsnprintf(logrec
, maxlen
, "%s %s %s\n",
1989 oid_to_hex(old_oid
),
1990 oid_to_hex(new_oid
),
1993 len
+= copy_reflog_msg(logrec
+ len
- 1, msg
) - 1;
1995 written
= len
<= maxlen
? write_in_full(fd
, logrec
, len
) : -1;
2003 static int files_log_ref_write(struct files_ref_store
*refs
,
2004 const char *refname
, const struct object_id
*old_oid
,
2005 const struct object_id
*new_oid
, const char *msg
,
2006 int flags
, struct strbuf
*err
)
2010 if (log_all_ref_updates
== LOG_REFS_UNSET
)
2011 log_all_ref_updates
= is_bare_repository() ? LOG_REFS_NONE
: LOG_REFS_NORMAL
;
2013 result
= log_ref_setup(refs
, refname
,
2014 flags
& REF_FORCE_CREATE_REFLOG
,
2022 result
= log_ref_write_fd(logfd
, old_oid
, new_oid
,
2023 git_committer_info(0), msg
);
2025 struct strbuf sb
= STRBUF_INIT
;
2026 int save_errno
= errno
;
2028 files_reflog_path(refs
, &sb
, refname
);
2029 strbuf_addf(err
, "unable to append to '%s': %s",
2030 sb
.buf
, strerror(save_errno
));
2031 strbuf_release(&sb
);
2036 struct strbuf sb
= STRBUF_INIT
;
2037 int save_errno
= errno
;
2039 files_reflog_path(refs
, &sb
, refname
);
2040 strbuf_addf(err
, "unable to append to '%s': %s",
2041 sb
.buf
, strerror(save_errno
));
2042 strbuf_release(&sb
);
2049 * Write sha1 into the open lockfile, then close the lockfile. On
2050 * errors, rollback the lockfile, fill in *err and
2053 static int write_ref_to_lockfile(struct ref_lock
*lock
,
2054 const struct object_id
*oid
, struct strbuf
*err
)
2056 static char term
= '\n';
2060 o
= parse_object(oid
);
2063 "trying to write ref '%s' with nonexistent object %s",
2064 lock
->ref_name
, oid_to_hex(oid
));
2068 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
2070 "trying to write non-commit object %s to branch '%s'",
2071 oid_to_hex(oid
), lock
->ref_name
);
2075 fd
= get_lock_file_fd(lock
->lk
);
2076 if (write_in_full(fd
, oid_to_hex(oid
), GIT_SHA1_HEXSZ
) != GIT_SHA1_HEXSZ
||
2077 write_in_full(fd
, &term
, 1) != 1 ||
2078 close_ref(lock
) < 0) {
2080 "couldn't write '%s'", get_lock_file_path(lock
->lk
));
2088 * Commit a change to a loose reference that has already been written
2089 * to the loose reference lockfile. Also update the reflogs if
2090 * necessary, using the specified lockmsg (which can be NULL).
2092 static int commit_ref_update(struct files_ref_store
*refs
,
2093 struct ref_lock
*lock
,
2094 const struct object_id
*oid
, const char *logmsg
,
2097 files_assert_main_repository(refs
, "commit_ref_update");
2099 clear_loose_ref_cache(refs
);
2100 if (files_log_ref_write(refs
, lock
->ref_name
,
2101 &lock
->old_oid
, oid
,
2103 char *old_msg
= strbuf_detach(err
, NULL
);
2104 strbuf_addf(err
, "cannot update the ref '%s': %s",
2105 lock
->ref_name
, old_msg
);
2111 if (strcmp(lock
->ref_name
, "HEAD") != 0) {
2113 * Special hack: If a branch is updated directly and HEAD
2114 * points to it (may happen on the remote side of a push
2115 * for example) then logically the HEAD reflog should be
2117 * A generic solution implies reverse symref information,
2118 * but finding all symrefs pointing to the given branch
2119 * would be rather costly for this rare event (the direct
2120 * update of a branch) to be worth it. So let's cheat and
2121 * check with HEAD only which should cover 99% of all usage
2122 * scenarios (even 100% of the default ones).
2124 struct object_id head_oid
;
2126 const char *head_ref
;
2128 head_ref
= refs_resolve_ref_unsafe(&refs
->base
, "HEAD",
2129 RESOLVE_REF_READING
,
2130 head_oid
.hash
, &head_flag
);
2131 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
2132 !strcmp(head_ref
, lock
->ref_name
)) {
2133 struct strbuf log_err
= STRBUF_INIT
;
2134 if (files_log_ref_write(refs
, "HEAD",
2135 &lock
->old_oid
, oid
,
2136 logmsg
, 0, &log_err
)) {
2137 error("%s", log_err
.buf
);
2138 strbuf_release(&log_err
);
2143 if (commit_ref(lock
)) {
2144 strbuf_addf(err
, "couldn't set '%s'", lock
->ref_name
);
2153 static int create_ref_symlink(struct ref_lock
*lock
, const char *target
)
2156 #ifndef NO_SYMLINK_HEAD
2157 char *ref_path
= get_locked_file_path(lock
->lk
);
2159 ret
= symlink(target
, ref_path
);
2163 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
2168 static void update_symref_reflog(struct files_ref_store
*refs
,
2169 struct ref_lock
*lock
, const char *refname
,
2170 const char *target
, const char *logmsg
)
2172 struct strbuf err
= STRBUF_INIT
;
2173 struct object_id new_oid
;
2175 !refs_read_ref_full(&refs
->base
, target
,
2176 RESOLVE_REF_READING
, new_oid
.hash
, NULL
) &&
2177 files_log_ref_write(refs
, refname
, &lock
->old_oid
,
2178 &new_oid
, logmsg
, 0, &err
)) {
2179 error("%s", err
.buf
);
2180 strbuf_release(&err
);
2184 static int create_symref_locked(struct files_ref_store
*refs
,
2185 struct ref_lock
*lock
, const char *refname
,
2186 const char *target
, const char *logmsg
)
2188 if (prefer_symlink_refs
&& !create_ref_symlink(lock
, target
)) {
2189 update_symref_reflog(refs
, lock
, refname
, target
, logmsg
);
2193 if (!fdopen_lock_file(lock
->lk
, "w"))
2194 return error("unable to fdopen %s: %s",
2195 lock
->lk
->tempfile
.filename
.buf
, strerror(errno
));
2197 update_symref_reflog(refs
, lock
, refname
, target
, logmsg
);
2199 /* no error check; commit_ref will check ferror */
2200 fprintf(lock
->lk
->tempfile
.fp
, "ref: %s\n", target
);
2201 if (commit_ref(lock
) < 0)
2202 return error("unable to write symref for %s: %s", refname
,
2207 static int files_create_symref(struct ref_store
*ref_store
,
2208 const char *refname
, const char *target
,
2211 struct files_ref_store
*refs
=
2212 files_downcast(ref_store
, REF_STORE_WRITE
, "create_symref");
2213 struct strbuf err
= STRBUF_INIT
;
2214 struct ref_lock
*lock
;
2217 lock
= lock_ref_sha1_basic(refs
, refname
, NULL
,
2218 NULL
, NULL
, REF_NODEREF
, NULL
,
2221 error("%s", err
.buf
);
2222 strbuf_release(&err
);
2226 ret
= create_symref_locked(refs
, lock
, refname
, target
, logmsg
);
2231 int set_worktree_head_symref(const char *gitdir
, const char *target
, const char *logmsg
)
2234 * FIXME: this obviously will not work well for future refs
2235 * backends. This function needs to die.
2237 struct files_ref_store
*refs
=
2238 files_downcast(get_main_ref_store(),
2242 static struct lock_file head_lock
;
2243 struct ref_lock
*lock
;
2244 struct strbuf head_path
= STRBUF_INIT
;
2245 const char *head_rel
;
2248 strbuf_addf(&head_path
, "%s/HEAD", absolute_path(gitdir
));
2249 if (hold_lock_file_for_update(&head_lock
, head_path
.buf
,
2250 LOCK_NO_DEREF
) < 0) {
2251 struct strbuf err
= STRBUF_INIT
;
2252 unable_to_lock_message(head_path
.buf
, errno
, &err
);
2253 error("%s", err
.buf
);
2254 strbuf_release(&err
);
2255 strbuf_release(&head_path
);
2259 /* head_rel will be "HEAD" for the main tree, "worktrees/wt/HEAD" for
2261 head_rel
= remove_leading_path(head_path
.buf
,
2262 absolute_path(get_git_common_dir()));
2263 /* to make use of create_symref_locked(), initialize ref_lock */
2264 lock
= xcalloc(1, sizeof(struct ref_lock
));
2265 lock
->lk
= &head_lock
;
2266 lock
->ref_name
= xstrdup(head_rel
);
2268 ret
= create_symref_locked(refs
, lock
, head_rel
, target
, logmsg
);
2270 unlock_ref(lock
); /* will free lock */
2271 strbuf_release(&head_path
);
2275 static int files_reflog_exists(struct ref_store
*ref_store
,
2276 const char *refname
)
2278 struct files_ref_store
*refs
=
2279 files_downcast(ref_store
, REF_STORE_READ
, "reflog_exists");
2280 struct strbuf sb
= STRBUF_INIT
;
2284 files_reflog_path(refs
, &sb
, refname
);
2285 ret
= !lstat(sb
.buf
, &st
) && S_ISREG(st
.st_mode
);
2286 strbuf_release(&sb
);
2290 static int files_delete_reflog(struct ref_store
*ref_store
,
2291 const char *refname
)
2293 struct files_ref_store
*refs
=
2294 files_downcast(ref_store
, REF_STORE_WRITE
, "delete_reflog");
2295 struct strbuf sb
= STRBUF_INIT
;
2298 files_reflog_path(refs
, &sb
, refname
);
2299 ret
= remove_path(sb
.buf
);
2300 strbuf_release(&sb
);
2304 static int show_one_reflog_ent(struct strbuf
*sb
, each_reflog_ent_fn fn
, void *cb_data
)
2306 struct object_id ooid
, noid
;
2307 char *email_end
, *message
;
2308 unsigned long timestamp
;
2310 const char *p
= sb
->buf
;
2312 /* old SP new SP name <email> SP time TAB msg LF */
2313 if (!sb
->len
|| sb
->buf
[sb
->len
- 1] != '\n' ||
2314 parse_oid_hex(p
, &ooid
, &p
) || *p
++ != ' ' ||
2315 parse_oid_hex(p
, &noid
, &p
) || *p
++ != ' ' ||
2316 !(email_end
= strchr(p
, '>')) ||
2317 email_end
[1] != ' ' ||
2318 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
2319 !message
|| message
[0] != ' ' ||
2320 (message
[1] != '+' && message
[1] != '-') ||
2321 !isdigit(message
[2]) || !isdigit(message
[3]) ||
2322 !isdigit(message
[4]) || !isdigit(message
[5]))
2323 return 0; /* corrupt? */
2324 email_end
[1] = '\0';
2325 tz
= strtol(message
+ 1, NULL
, 10);
2326 if (message
[6] != '\t')
2330 return fn(&ooid
, &noid
, p
, timestamp
, tz
, message
, cb_data
);
2333 static char *find_beginning_of_line(char *bob
, char *scan
)
2335 while (bob
< scan
&& *(--scan
) != '\n')
2336 ; /* keep scanning backwards */
2338 * Return either beginning of the buffer, or LF at the end of
2339 * the previous line.
2344 static int files_for_each_reflog_ent_reverse(struct ref_store
*ref_store
,
2345 const char *refname
,
2346 each_reflog_ent_fn fn
,
2349 struct files_ref_store
*refs
=
2350 files_downcast(ref_store
, REF_STORE_READ
,
2351 "for_each_reflog_ent_reverse");
2352 struct strbuf sb
= STRBUF_INIT
;
2355 int ret
= 0, at_tail
= 1;
2357 files_reflog_path(refs
, &sb
, refname
);
2358 logfp
= fopen(sb
.buf
, "r");
2359 strbuf_release(&sb
);
2363 /* Jump to the end */
2364 if (fseek(logfp
, 0, SEEK_END
) < 0)
2365 ret
= error("cannot seek back reflog for %s: %s",
2366 refname
, strerror(errno
));
2368 while (!ret
&& 0 < pos
) {
2374 /* Fill next block from the end */
2375 cnt
= (sizeof(buf
) < pos
) ? sizeof(buf
) : pos
;
2376 if (fseek(logfp
, pos
- cnt
, SEEK_SET
)) {
2377 ret
= error("cannot seek back reflog for %s: %s",
2378 refname
, strerror(errno
));
2381 nread
= fread(buf
, cnt
, 1, logfp
);
2383 ret
= error("cannot read %d bytes from reflog for %s: %s",
2384 cnt
, refname
, strerror(errno
));
2389 scanp
= endp
= buf
+ cnt
;
2390 if (at_tail
&& scanp
[-1] == '\n')
2391 /* Looking at the final LF at the end of the file */
2395 while (buf
< scanp
) {
2397 * terminating LF of the previous line, or the beginning
2402 bp
= find_beginning_of_line(buf
, scanp
);
2406 * The newline is the end of the previous line,
2407 * so we know we have complete line starting
2408 * at (bp + 1). Prefix it onto any prior data
2409 * we collected for the line and process it.
2411 strbuf_splice(&sb
, 0, 0, bp
+ 1, endp
- (bp
+ 1));
2414 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2420 * We are at the start of the buffer, and the
2421 * start of the file; there is no previous
2422 * line, and we have everything for this one.
2423 * Process it, and we can end the loop.
2425 strbuf_splice(&sb
, 0, 0, buf
, endp
- buf
);
2426 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2433 * We are at the start of the buffer, and there
2434 * is more file to read backwards. Which means
2435 * we are in the middle of a line. Note that we
2436 * may get here even if *bp was a newline; that
2437 * just means we are at the exact end of the
2438 * previous line, rather than some spot in the
2441 * Save away what we have to be combined with
2442 * the data from the next read.
2444 strbuf_splice(&sb
, 0, 0, buf
, endp
- buf
);
2451 die("BUG: reverse reflog parser had leftover data");
2454 strbuf_release(&sb
);
2458 static int files_for_each_reflog_ent(struct ref_store
*ref_store
,
2459 const char *refname
,
2460 each_reflog_ent_fn fn
, void *cb_data
)
2462 struct files_ref_store
*refs
=
2463 files_downcast(ref_store
, REF_STORE_READ
,
2464 "for_each_reflog_ent");
2466 struct strbuf sb
= STRBUF_INIT
;
2469 files_reflog_path(refs
, &sb
, refname
);
2470 logfp
= fopen(sb
.buf
, "r");
2471 strbuf_release(&sb
);
2475 while (!ret
&& !strbuf_getwholeline(&sb
, logfp
, '\n'))
2476 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2478 strbuf_release(&sb
);
2482 struct files_reflog_iterator
{
2483 struct ref_iterator base
;
2485 struct ref_store
*ref_store
;
2486 struct dir_iterator
*dir_iterator
;
2487 struct object_id oid
;
2490 static int files_reflog_iterator_advance(struct ref_iterator
*ref_iterator
)
2492 struct files_reflog_iterator
*iter
=
2493 (struct files_reflog_iterator
*)ref_iterator
;
2494 struct dir_iterator
*diter
= iter
->dir_iterator
;
2497 while ((ok
= dir_iterator_advance(diter
)) == ITER_OK
) {
2500 if (!S_ISREG(diter
->st
.st_mode
))
2502 if (diter
->basename
[0] == '.')
2504 if (ends_with(diter
->basename
, ".lock"))
2507 if (refs_read_ref_full(iter
->ref_store
,
2508 diter
->relative_path
, 0,
2509 iter
->oid
.hash
, &flags
)) {
2510 error("bad ref for %s", diter
->path
.buf
);
2514 iter
->base
.refname
= diter
->relative_path
;
2515 iter
->base
.oid
= &iter
->oid
;
2516 iter
->base
.flags
= flags
;
2520 iter
->dir_iterator
= NULL
;
2521 if (ref_iterator_abort(ref_iterator
) == ITER_ERROR
)
2526 static int files_reflog_iterator_peel(struct ref_iterator
*ref_iterator
,
2527 struct object_id
*peeled
)
2529 die("BUG: ref_iterator_peel() called for reflog_iterator");
2532 static int files_reflog_iterator_abort(struct ref_iterator
*ref_iterator
)
2534 struct files_reflog_iterator
*iter
=
2535 (struct files_reflog_iterator
*)ref_iterator
;
2538 if (iter
->dir_iterator
)
2539 ok
= dir_iterator_abort(iter
->dir_iterator
);
2541 base_ref_iterator_free(ref_iterator
);
2545 static struct ref_iterator_vtable files_reflog_iterator_vtable
= {
2546 files_reflog_iterator_advance
,
2547 files_reflog_iterator_peel
,
2548 files_reflog_iterator_abort
2551 static struct ref_iterator
*files_reflog_iterator_begin(struct ref_store
*ref_store
)
2553 struct files_ref_store
*refs
=
2554 files_downcast(ref_store
, REF_STORE_READ
,
2555 "reflog_iterator_begin");
2556 struct files_reflog_iterator
*iter
= xcalloc(1, sizeof(*iter
));
2557 struct ref_iterator
*ref_iterator
= &iter
->base
;
2558 struct strbuf sb
= STRBUF_INIT
;
2560 base_ref_iterator_init(ref_iterator
, &files_reflog_iterator_vtable
);
2561 files_reflog_path(refs
, &sb
, NULL
);
2562 iter
->dir_iterator
= dir_iterator_begin(sb
.buf
);
2563 iter
->ref_store
= ref_store
;
2564 strbuf_release(&sb
);
2565 return ref_iterator
;
2568 static int ref_update_reject_duplicates(struct string_list
*refnames
,
2571 int i
, n
= refnames
->nr
;
2575 for (i
= 1; i
< n
; i
++)
2576 if (!strcmp(refnames
->items
[i
- 1].string
, refnames
->items
[i
].string
)) {
2578 "multiple updates for ref '%s' not allowed.",
2579 refnames
->items
[i
].string
);
2586 * If update is a direct update of head_ref (the reference pointed to
2587 * by HEAD), then add an extra REF_LOG_ONLY update for HEAD.
2589 static int split_head_update(struct ref_update
*update
,
2590 struct ref_transaction
*transaction
,
2591 const char *head_ref
,
2592 struct string_list
*affected_refnames
,
2595 struct string_list_item
*item
;
2596 struct ref_update
*new_update
;
2598 if ((update
->flags
& REF_LOG_ONLY
) ||
2599 (update
->flags
& REF_ISPRUNING
) ||
2600 (update
->flags
& REF_UPDATE_VIA_HEAD
))
2603 if (strcmp(update
->refname
, head_ref
))
2607 * First make sure that HEAD is not already in the
2608 * transaction. This insertion is O(N) in the transaction
2609 * size, but it happens at most once per transaction.
2611 item
= string_list_insert(affected_refnames
, "HEAD");
2613 /* An entry already existed */
2615 "multiple updates for 'HEAD' (including one "
2616 "via its referent '%s') are not allowed",
2618 return TRANSACTION_NAME_CONFLICT
;
2621 new_update
= ref_transaction_add_update(
2622 transaction
, "HEAD",
2623 update
->flags
| REF_LOG_ONLY
| REF_NODEREF
,
2624 update
->new_oid
.hash
, update
->old_oid
.hash
,
2627 item
->util
= new_update
;
2633 * update is for a symref that points at referent and doesn't have
2634 * REF_NODEREF set. Split it into two updates:
2635 * - The original update, but with REF_LOG_ONLY and REF_NODEREF set
2636 * - A new, separate update for the referent reference
2637 * Note that the new update will itself be subject to splitting when
2638 * the iteration gets to it.
2640 static int split_symref_update(struct files_ref_store
*refs
,
2641 struct ref_update
*update
,
2642 const char *referent
,
2643 struct ref_transaction
*transaction
,
2644 struct string_list
*affected_refnames
,
2647 struct string_list_item
*item
;
2648 struct ref_update
*new_update
;
2649 unsigned int new_flags
;
2652 * First make sure that referent is not already in the
2653 * transaction. This insertion is O(N) in the transaction
2654 * size, but it happens at most once per symref in a
2657 item
= string_list_insert(affected_refnames
, referent
);
2659 /* An entry already existed */
2661 "multiple updates for '%s' (including one "
2662 "via symref '%s') are not allowed",
2663 referent
, update
->refname
);
2664 return TRANSACTION_NAME_CONFLICT
;
2667 new_flags
= update
->flags
;
2668 if (!strcmp(update
->refname
, "HEAD")) {
2670 * Record that the new update came via HEAD, so that
2671 * when we process it, split_head_update() doesn't try
2672 * to add another reflog update for HEAD. Note that
2673 * this bit will be propagated if the new_update
2674 * itself needs to be split.
2676 new_flags
|= REF_UPDATE_VIA_HEAD
;
2679 new_update
= ref_transaction_add_update(
2680 transaction
, referent
, new_flags
,
2681 update
->new_oid
.hash
, update
->old_oid
.hash
,
2684 new_update
->parent_update
= update
;
2687 * Change the symbolic ref update to log only. Also, it
2688 * doesn't need to check its old SHA-1 value, as that will be
2689 * done when new_update is processed.
2691 update
->flags
|= REF_LOG_ONLY
| REF_NODEREF
;
2692 update
->flags
&= ~REF_HAVE_OLD
;
2694 item
->util
= new_update
;
2700 * Return the refname under which update was originally requested.
2702 static const char *original_update_refname(struct ref_update
*update
)
2704 while (update
->parent_update
)
2705 update
= update
->parent_update
;
2707 return update
->refname
;
2711 * Check whether the REF_HAVE_OLD and old_oid values stored in update
2712 * are consistent with oid, which is the reference's current value. If
2713 * everything is OK, return 0; otherwise, write an error message to
2714 * err and return -1.
2716 static int check_old_oid(struct ref_update
*update
, struct object_id
*oid
,
2719 if (!(update
->flags
& REF_HAVE_OLD
) ||
2720 !oidcmp(oid
, &update
->old_oid
))
2723 if (is_null_oid(&update
->old_oid
))
2724 strbuf_addf(err
, "cannot lock ref '%s': "
2725 "reference already exists",
2726 original_update_refname(update
));
2727 else if (is_null_oid(oid
))
2728 strbuf_addf(err
, "cannot lock ref '%s': "
2729 "reference is missing but expected %s",
2730 original_update_refname(update
),
2731 oid_to_hex(&update
->old_oid
));
2733 strbuf_addf(err
, "cannot lock ref '%s': "
2734 "is at %s but expected %s",
2735 original_update_refname(update
),
2737 oid_to_hex(&update
->old_oid
));
2743 * Prepare for carrying out update:
2744 * - Lock the reference referred to by update.
2745 * - Read the reference under lock.
2746 * - Check that its old SHA-1 value (if specified) is correct, and in
2747 * any case record it in update->lock->old_oid for later use when
2748 * writing the reflog.
2749 * - If it is a symref update without REF_NODEREF, split it up into a
2750 * REF_LOG_ONLY update of the symref and add a separate update for
2751 * the referent to transaction.
2752 * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY
2755 static int lock_ref_for_update(struct files_ref_store
*refs
,
2756 struct ref_update
*update
,
2757 struct ref_transaction
*transaction
,
2758 const char *head_ref
,
2759 struct string_list
*affected_refnames
,
2762 struct strbuf referent
= STRBUF_INIT
;
2763 int mustexist
= (update
->flags
& REF_HAVE_OLD
) &&
2764 !is_null_oid(&update
->old_oid
);
2766 struct ref_lock
*lock
;
2768 files_assert_main_repository(refs
, "lock_ref_for_update");
2770 if ((update
->flags
& REF_HAVE_NEW
) && is_null_oid(&update
->new_oid
))
2771 update
->flags
|= REF_DELETING
;
2774 ret
= split_head_update(update
, transaction
, head_ref
,
2775 affected_refnames
, err
);
2780 ret
= lock_raw_ref(refs
, update
->refname
, mustexist
,
2781 affected_refnames
, NULL
,
2783 &update
->type
, err
);
2787 reason
= strbuf_detach(err
, NULL
);
2788 strbuf_addf(err
, "cannot lock ref '%s': %s",
2789 original_update_refname(update
), reason
);
2794 update
->backend_data
= lock
;
2796 if (update
->type
& REF_ISSYMREF
) {
2797 if (update
->flags
& REF_NODEREF
) {
2799 * We won't be reading the referent as part of
2800 * the transaction, so we have to read it here
2801 * to record and possibly check old_sha1:
2803 if (refs_read_ref_full(&refs
->base
,
2805 lock
->old_oid
.hash
, NULL
)) {
2806 if (update
->flags
& REF_HAVE_OLD
) {
2807 strbuf_addf(err
, "cannot lock ref '%s': "
2808 "error reading reference",
2809 original_update_refname(update
));
2812 } else if (check_old_oid(update
, &lock
->old_oid
, err
)) {
2813 return TRANSACTION_GENERIC_ERROR
;
2817 * Create a new update for the reference this
2818 * symref is pointing at. Also, we will record
2819 * and verify old_sha1 for this update as part
2820 * of processing the split-off update, so we
2821 * don't have to do it here.
2823 ret
= split_symref_update(refs
, update
,
2824 referent
.buf
, transaction
,
2825 affected_refnames
, err
);
2830 struct ref_update
*parent_update
;
2832 if (check_old_oid(update
, &lock
->old_oid
, err
))
2833 return TRANSACTION_GENERIC_ERROR
;
2836 * If this update is happening indirectly because of a
2837 * symref update, record the old SHA-1 in the parent
2840 for (parent_update
= update
->parent_update
;
2842 parent_update
= parent_update
->parent_update
) {
2843 struct ref_lock
*parent_lock
= parent_update
->backend_data
;
2844 oidcpy(&parent_lock
->old_oid
, &lock
->old_oid
);
2848 if ((update
->flags
& REF_HAVE_NEW
) &&
2849 !(update
->flags
& REF_DELETING
) &&
2850 !(update
->flags
& REF_LOG_ONLY
)) {
2851 if (!(update
->type
& REF_ISSYMREF
) &&
2852 !oidcmp(&lock
->old_oid
, &update
->new_oid
)) {
2854 * The reference already has the desired
2855 * value, so we don't need to write it.
2857 } else if (write_ref_to_lockfile(lock
, &update
->new_oid
,
2859 char *write_err
= strbuf_detach(err
, NULL
);
2862 * The lock was freed upon failure of
2863 * write_ref_to_lockfile():
2865 update
->backend_data
= NULL
;
2867 "cannot update ref '%s': %s",
2868 update
->refname
, write_err
);
2870 return TRANSACTION_GENERIC_ERROR
;
2872 update
->flags
|= REF_NEEDS_COMMIT
;
2875 if (!(update
->flags
& REF_NEEDS_COMMIT
)) {
2877 * We didn't call write_ref_to_lockfile(), so
2878 * the lockfile is still open. Close it to
2879 * free up the file descriptor:
2881 if (close_ref(lock
)) {
2882 strbuf_addf(err
, "couldn't close '%s.lock'",
2884 return TRANSACTION_GENERIC_ERROR
;
2890 static int files_transaction_commit(struct ref_store
*ref_store
,
2891 struct ref_transaction
*transaction
,
2894 struct files_ref_store
*refs
=
2895 files_downcast(ref_store
, REF_STORE_WRITE
,
2896 "ref_transaction_commit");
2898 struct string_list refs_to_delete
= STRING_LIST_INIT_NODUP
;
2899 struct string_list_item
*ref_to_delete
;
2900 struct string_list affected_refnames
= STRING_LIST_INIT_NODUP
;
2901 char *head_ref
= NULL
;
2903 struct object_id head_oid
;
2904 struct strbuf sb
= STRBUF_INIT
;
2908 if (transaction
->state
!= REF_TRANSACTION_OPEN
)
2909 die("BUG: commit called for transaction that is not open");
2911 if (!transaction
->nr
) {
2912 transaction
->state
= REF_TRANSACTION_CLOSED
;
2917 * Fail if a refname appears more than once in the
2918 * transaction. (If we end up splitting up any updates using
2919 * split_symref_update() or split_head_update(), those
2920 * functions will check that the new updates don't have the
2921 * same refname as any existing ones.)
2923 for (i
= 0; i
< transaction
->nr
; i
++) {
2924 struct ref_update
*update
= transaction
->updates
[i
];
2925 struct string_list_item
*item
=
2926 string_list_append(&affected_refnames
, update
->refname
);
2929 * We store a pointer to update in item->util, but at
2930 * the moment we never use the value of this field
2931 * except to check whether it is non-NULL.
2933 item
->util
= update
;
2935 string_list_sort(&affected_refnames
);
2936 if (ref_update_reject_duplicates(&affected_refnames
, err
)) {
2937 ret
= TRANSACTION_GENERIC_ERROR
;
2942 * Special hack: If a branch is updated directly and HEAD
2943 * points to it (may happen on the remote side of a push
2944 * for example) then logically the HEAD reflog should be
2947 * A generic solution would require reverse symref lookups,
2948 * but finding all symrefs pointing to a given branch would be
2949 * rather costly for this rare event (the direct update of a
2950 * branch) to be worth it. So let's cheat and check with HEAD
2951 * only, which should cover 99% of all usage scenarios (even
2952 * 100% of the default ones).
2954 * So if HEAD is a symbolic reference, then record the name of
2955 * the reference that it points to. If we see an update of
2956 * head_ref within the transaction, then split_head_update()
2957 * arranges for the reflog of HEAD to be updated, too.
2959 head_ref
= refs_resolve_refdup(ref_store
, "HEAD",
2960 RESOLVE_REF_NO_RECURSE
,
2961 head_oid
.hash
, &head_type
);
2963 if (head_ref
&& !(head_type
& REF_ISSYMREF
)) {
2969 * Acquire all locks, verify old values if provided, check
2970 * that new values are valid, and write new values to the
2971 * lockfiles, ready to be activated. Only keep one lockfile
2972 * open at a time to avoid running out of file descriptors.
2974 for (i
= 0; i
< transaction
->nr
; i
++) {
2975 struct ref_update
*update
= transaction
->updates
[i
];
2977 ret
= lock_ref_for_update(refs
, update
, transaction
,
2978 head_ref
, &affected_refnames
, err
);
2983 /* Perform updates first so live commits remain referenced */
2984 for (i
= 0; i
< transaction
->nr
; i
++) {
2985 struct ref_update
*update
= transaction
->updates
[i
];
2986 struct ref_lock
*lock
= update
->backend_data
;
2988 if (update
->flags
& REF_NEEDS_COMMIT
||
2989 update
->flags
& REF_LOG_ONLY
) {
2990 if (files_log_ref_write(refs
,
2994 update
->msg
, update
->flags
,
2996 char *old_msg
= strbuf_detach(err
, NULL
);
2998 strbuf_addf(err
, "cannot update the ref '%s': %s",
2999 lock
->ref_name
, old_msg
);
3002 update
->backend_data
= NULL
;
3003 ret
= TRANSACTION_GENERIC_ERROR
;
3007 if (update
->flags
& REF_NEEDS_COMMIT
) {
3008 clear_loose_ref_cache(refs
);
3009 if (commit_ref(lock
)) {
3010 strbuf_addf(err
, "couldn't set '%s'", lock
->ref_name
);
3012 update
->backend_data
= NULL
;
3013 ret
= TRANSACTION_GENERIC_ERROR
;
3018 /* Perform deletes now that updates are safely completed */
3019 for (i
= 0; i
< transaction
->nr
; i
++) {
3020 struct ref_update
*update
= transaction
->updates
[i
];
3021 struct ref_lock
*lock
= update
->backend_data
;
3023 if (update
->flags
& REF_DELETING
&&
3024 !(update
->flags
& REF_LOG_ONLY
)) {
3025 if (!(update
->type
& REF_ISPACKED
) ||
3026 update
->type
& REF_ISSYMREF
) {
3027 /* It is a loose reference. */
3029 files_ref_path(refs
, &sb
, lock
->ref_name
);
3030 if (unlink_or_msg(sb
.buf
, err
)) {
3031 ret
= TRANSACTION_GENERIC_ERROR
;
3034 update
->flags
|= REF_DELETED_LOOSE
;
3037 if (!(update
->flags
& REF_ISPRUNING
))
3038 string_list_append(&refs_to_delete
,
3043 if (repack_without_refs(refs
, &refs_to_delete
, err
)) {
3044 ret
= TRANSACTION_GENERIC_ERROR
;
3048 /* Delete the reflogs of any references that were deleted: */
3049 for_each_string_list_item(ref_to_delete
, &refs_to_delete
) {
3051 files_reflog_path(refs
, &sb
, ref_to_delete
->string
);
3052 if (!unlink_or_warn(sb
.buf
))
3053 try_remove_empty_parents(refs
, ref_to_delete
->string
,
3054 REMOVE_EMPTY_PARENTS_REFLOG
);
3057 clear_loose_ref_cache(refs
);
3060 strbuf_release(&sb
);
3061 transaction
->state
= REF_TRANSACTION_CLOSED
;
3063 for (i
= 0; i
< transaction
->nr
; i
++) {
3064 struct ref_update
*update
= transaction
->updates
[i
];
3065 struct ref_lock
*lock
= update
->backend_data
;
3070 if (update
->flags
& REF_DELETED_LOOSE
) {
3072 * The loose reference was deleted. Delete any
3073 * empty parent directories. (Note that this
3074 * can only work because we have already
3075 * removed the lockfile.)
3077 try_remove_empty_parents(refs
, update
->refname
,
3078 REMOVE_EMPTY_PARENTS_REF
);
3082 string_list_clear(&refs_to_delete
, 0);
3084 string_list_clear(&affected_refnames
, 0);
3089 static int ref_present(const char *refname
,
3090 const struct object_id
*oid
, int flags
, void *cb_data
)
3092 struct string_list
*affected_refnames
= cb_data
;
3094 return string_list_has_string(affected_refnames
, refname
);
3097 static int files_initial_transaction_commit(struct ref_store
*ref_store
,
3098 struct ref_transaction
*transaction
,
3101 struct files_ref_store
*refs
=
3102 files_downcast(ref_store
, REF_STORE_WRITE
,
3103 "initial_ref_transaction_commit");
3105 struct string_list affected_refnames
= STRING_LIST_INIT_NODUP
;
3109 if (transaction
->state
!= REF_TRANSACTION_OPEN
)
3110 die("BUG: commit called for transaction that is not open");
3112 /* Fail if a refname appears more than once in the transaction: */
3113 for (i
= 0; i
< transaction
->nr
; i
++)
3114 string_list_append(&affected_refnames
,
3115 transaction
->updates
[i
]->refname
);
3116 string_list_sort(&affected_refnames
);
3117 if (ref_update_reject_duplicates(&affected_refnames
, err
)) {
3118 ret
= TRANSACTION_GENERIC_ERROR
;
3123 * It's really undefined to call this function in an active
3124 * repository or when there are existing references: we are
3125 * only locking and changing packed-refs, so (1) any
3126 * simultaneous processes might try to change a reference at
3127 * the same time we do, and (2) any existing loose versions of
3128 * the references that we are setting would have precedence
3129 * over our values. But some remote helpers create the remote
3130 * "HEAD" and "master" branches before calling this function,
3131 * so here we really only check that none of the references
3132 * that we are creating already exists.
3134 if (refs_for_each_rawref(&refs
->base
, ref_present
,
3135 &affected_refnames
))
3136 die("BUG: initial ref transaction called with existing refs");
3138 for (i
= 0; i
< transaction
->nr
; i
++) {
3139 struct ref_update
*update
= transaction
->updates
[i
];
3141 if ((update
->flags
& REF_HAVE_OLD
) &&
3142 !is_null_oid(&update
->old_oid
))
3143 die("BUG: initial ref transaction with old_sha1 set");
3144 if (refs_verify_refname_available(&refs
->base
, update
->refname
,
3145 &affected_refnames
, NULL
,
3147 ret
= TRANSACTION_NAME_CONFLICT
;
3152 if (lock_packed_refs(refs
, 0)) {
3153 strbuf_addf(err
, "unable to lock packed-refs file: %s",
3155 ret
= TRANSACTION_GENERIC_ERROR
;
3159 for (i
= 0; i
< transaction
->nr
; i
++) {
3160 struct ref_update
*update
= transaction
->updates
[i
];
3162 if ((update
->flags
& REF_HAVE_NEW
) &&
3163 !is_null_oid(&update
->new_oid
))
3164 add_packed_ref(refs
, update
->refname
,
3168 if (commit_packed_refs(refs
)) {
3169 strbuf_addf(err
, "unable to commit packed-refs file: %s",
3171 ret
= TRANSACTION_GENERIC_ERROR
;
3176 transaction
->state
= REF_TRANSACTION_CLOSED
;
3177 string_list_clear(&affected_refnames
, 0);
3181 struct expire_reflog_cb
{
3183 reflog_expiry_should_prune_fn
*should_prune_fn
;
3186 struct object_id last_kept_oid
;
3189 static int expire_reflog_ent(struct object_id
*ooid
, struct object_id
*noid
,
3190 const char *email
, unsigned long timestamp
, int tz
,
3191 const char *message
, void *cb_data
)
3193 struct expire_reflog_cb
*cb
= cb_data
;
3194 struct expire_reflog_policy_cb
*policy_cb
= cb
->policy_cb
;
3196 if (cb
->flags
& EXPIRE_REFLOGS_REWRITE
)
3197 ooid
= &cb
->last_kept_oid
;
3199 if ((*cb
->should_prune_fn
)(ooid
, noid
, email
, timestamp
, tz
,
3200 message
, policy_cb
)) {
3202 printf("would prune %s", message
);
3203 else if (cb
->flags
& EXPIRE_REFLOGS_VERBOSE
)
3204 printf("prune %s", message
);
3207 fprintf(cb
->newlog
, "%s %s %s %lu %+05d\t%s",
3208 oid_to_hex(ooid
), oid_to_hex(noid
),
3209 email
, timestamp
, tz
, message
);
3210 oidcpy(&cb
->last_kept_oid
, noid
);
3212 if (cb
->flags
& EXPIRE_REFLOGS_VERBOSE
)
3213 printf("keep %s", message
);
3218 static int files_reflog_expire(struct ref_store
*ref_store
,
3219 const char *refname
, const unsigned char *sha1
,
3221 reflog_expiry_prepare_fn prepare_fn
,
3222 reflog_expiry_should_prune_fn should_prune_fn
,
3223 reflog_expiry_cleanup_fn cleanup_fn
,
3224 void *policy_cb_data
)
3226 struct files_ref_store
*refs
=
3227 files_downcast(ref_store
, REF_STORE_WRITE
, "reflog_expire");
3228 static struct lock_file reflog_lock
;
3229 struct expire_reflog_cb cb
;
3230 struct ref_lock
*lock
;
3231 struct strbuf log_file_sb
= STRBUF_INIT
;
3235 struct strbuf err
= STRBUF_INIT
;
3236 struct object_id oid
;
3238 memset(&cb
, 0, sizeof(cb
));
3240 cb
.policy_cb
= policy_cb_data
;
3241 cb
.should_prune_fn
= should_prune_fn
;
3244 * The reflog file is locked by holding the lock on the
3245 * reference itself, plus we might need to update the
3246 * reference if --updateref was specified:
3248 lock
= lock_ref_sha1_basic(refs
, refname
, sha1
,
3249 NULL
, NULL
, REF_NODEREF
,
3252 error("cannot lock ref '%s': %s", refname
, err
.buf
);
3253 strbuf_release(&err
);
3256 if (!refs_reflog_exists(ref_store
, refname
)) {
3261 files_reflog_path(refs
, &log_file_sb
, refname
);
3262 log_file
= strbuf_detach(&log_file_sb
, NULL
);
3263 if (!(flags
& EXPIRE_REFLOGS_DRY_RUN
)) {
3265 * Even though holding $GIT_DIR/logs/$reflog.lock has
3266 * no locking implications, we use the lock_file
3267 * machinery here anyway because it does a lot of the
3268 * work we need, including cleaning up if the program
3269 * exits unexpectedly.
3271 if (hold_lock_file_for_update(&reflog_lock
, log_file
, 0) < 0) {
3272 struct strbuf err
= STRBUF_INIT
;
3273 unable_to_lock_message(log_file
, errno
, &err
);
3274 error("%s", err
.buf
);
3275 strbuf_release(&err
);
3278 cb
.newlog
= fdopen_lock_file(&reflog_lock
, "w");
3280 error("cannot fdopen %s (%s)",
3281 get_lock_file_path(&reflog_lock
), strerror(errno
));
3286 hashcpy(oid
.hash
, sha1
);
3288 (*prepare_fn
)(refname
, &oid
, cb
.policy_cb
);
3289 refs_for_each_reflog_ent(ref_store
, refname
, expire_reflog_ent
, &cb
);
3290 (*cleanup_fn
)(cb
.policy_cb
);
3292 if (!(flags
& EXPIRE_REFLOGS_DRY_RUN
)) {
3294 * It doesn't make sense to adjust a reference pointed
3295 * to by a symbolic ref based on expiring entries in
3296 * the symbolic reference's reflog. Nor can we update
3297 * a reference if there are no remaining reflog
3300 int update
= (flags
& EXPIRE_REFLOGS_UPDATE_REF
) &&
3301 !(type
& REF_ISSYMREF
) &&
3302 !is_null_oid(&cb
.last_kept_oid
);
3304 if (close_lock_file(&reflog_lock
)) {
3305 status
|= error("couldn't write %s: %s", log_file
,
3307 } else if (update
&&
3308 (write_in_full(get_lock_file_fd(lock
->lk
),
3309 oid_to_hex(&cb
.last_kept_oid
), GIT_SHA1_HEXSZ
) != GIT_SHA1_HEXSZ
||
3310 write_str_in_full(get_lock_file_fd(lock
->lk
), "\n") != 1 ||
3311 close_ref(lock
) < 0)) {
3312 status
|= error("couldn't write %s",
3313 get_lock_file_path(lock
->lk
));
3314 rollback_lock_file(&reflog_lock
);
3315 } else if (commit_lock_file(&reflog_lock
)) {
3316 status
|= error("unable to write reflog '%s' (%s)",
3317 log_file
, strerror(errno
));
3318 } else if (update
&& commit_ref(lock
)) {
3319 status
|= error("couldn't set %s", lock
->ref_name
);
3327 rollback_lock_file(&reflog_lock
);
3333 static int files_init_db(struct ref_store
*ref_store
, struct strbuf
*err
)
3335 struct files_ref_store
*refs
=
3336 files_downcast(ref_store
, REF_STORE_WRITE
, "init_db");
3337 struct strbuf sb
= STRBUF_INIT
;
3340 * Create .git/refs/{heads,tags}
3342 files_ref_path(refs
, &sb
, "refs/heads");
3343 safe_create_dir(sb
.buf
, 1);
3346 files_ref_path(refs
, &sb
, "refs/tags");
3347 safe_create_dir(sb
.buf
, 1);
3349 strbuf_release(&sb
);
3353 struct ref_storage_be refs_be_files
= {
3356 files_ref_store_create
,
3358 files_transaction_commit
,
3359 files_initial_transaction_commit
,
3363 files_create_symref
,
3367 files_ref_iterator_begin
,
3370 files_reflog_iterator_begin
,
3371 files_for_each_reflog_ent
,
3372 files_for_each_reflog_ent_reverse
,
3373 files_reflog_exists
,
3374 files_create_reflog
,
3375 files_delete_reflog
,