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
, unsigned char *sha1
)
203 * 42: the answer to everything.
205 * In this case, it happens to be the answer to
206 * 40 (length of sha1 hex representation)
207 * +1 (space in between hex and name)
208 * +1 (newline at the end of the line)
213 if (get_sha1_hex(line
->buf
, sha1
) < 0)
215 if (!isspace(line
->buf
[40]))
218 ref
= line
->buf
+ 41;
222 if (line
->buf
[line
->len
- 1] != '\n')
224 line
->buf
[--line
->len
] = 0;
230 * Read f, which is a packed-refs file, into dir.
232 * A comment line of the form "# pack-refs with: " may contain zero or
233 * more traits. We interpret the traits as follows:
237 * Probably no references are peeled. But if the file contains a
238 * peeled value for a reference, we will use it.
242 * References under "refs/tags/", if they *can* be peeled, *are*
243 * peeled in this file. References outside of "refs/tags/" are
244 * probably not peeled even if they could have been, but if we find
245 * a peeled value for such a reference we will use it.
249 * All references in the file that can be peeled are peeled.
250 * Inversely (and this is more important), any references in the
251 * file for which no peeled value is recorded is not peelable. This
252 * trait should typically be written alongside "peeled" for
253 * compatibility with older clients, but we do not require it
254 * (i.e., "peeled" is a no-op if "fully-peeled" is set).
256 static void read_packed_refs(FILE *f
, struct ref_dir
*dir
)
258 struct ref_entry
*last
= NULL
;
259 struct strbuf line
= STRBUF_INIT
;
260 enum { PEELED_NONE
, PEELED_TAGS
, PEELED_FULLY
} peeled
= PEELED_NONE
;
262 while (strbuf_getwholeline(&line
, f
, '\n') != EOF
) {
263 unsigned char sha1
[20];
267 if (skip_prefix(line
.buf
, "# pack-refs with:", &traits
)) {
268 if (strstr(traits
, " fully-peeled "))
269 peeled
= PEELED_FULLY
;
270 else if (strstr(traits
, " peeled "))
271 peeled
= PEELED_TAGS
;
272 /* perhaps other traits later as well */
276 refname
= parse_ref_line(&line
, sha1
);
278 int flag
= REF_ISPACKED
;
280 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
)) {
281 if (!refname_is_safe(refname
))
282 die("packed refname is dangerous: %s", refname
);
284 flag
|= REF_BAD_NAME
| REF_ISBROKEN
;
286 last
= create_ref_entry(refname
, sha1
, flag
, 0);
287 if (peeled
== PEELED_FULLY
||
288 (peeled
== PEELED_TAGS
&& starts_with(refname
, "refs/tags/")))
289 last
->flag
|= REF_KNOWS_PEELED
;
290 add_ref_entry(dir
, last
);
294 line
.buf
[0] == '^' &&
295 line
.len
== PEELED_LINE_LENGTH
&&
296 line
.buf
[PEELED_LINE_LENGTH
- 1] == '\n' &&
297 !get_sha1_hex(line
.buf
+ 1, sha1
)) {
298 hashcpy(last
->u
.value
.peeled
.hash
, sha1
);
300 * Regardless of what the file header said,
301 * we definitely know the value of *this*
304 last
->flag
|= REF_KNOWS_PEELED
;
308 strbuf_release(&line
);
311 static const char *files_packed_refs_path(struct files_ref_store
*refs
)
313 return refs
->packed_refs_path
;
316 static void files_reflog_path(struct files_ref_store
*refs
,
322 * FIXME: of course this is wrong in multi worktree
323 * setting. To be fixed real soon.
325 strbuf_addf(sb
, "%s/logs", refs
->gitcommondir
);
329 switch (ref_type(refname
)) {
330 case REF_TYPE_PER_WORKTREE
:
331 case REF_TYPE_PSEUDOREF
:
332 strbuf_addf(sb
, "%s/logs/%s", refs
->gitdir
, refname
);
334 case REF_TYPE_NORMAL
:
335 strbuf_addf(sb
, "%s/logs/%s", refs
->gitcommondir
, refname
);
338 die("BUG: unknown ref type %d of ref %s",
339 ref_type(refname
), refname
);
343 static void files_ref_path(struct files_ref_store
*refs
,
347 switch (ref_type(refname
)) {
348 case REF_TYPE_PER_WORKTREE
:
349 case REF_TYPE_PSEUDOREF
:
350 strbuf_addf(sb
, "%s/%s", refs
->gitdir
, refname
);
352 case REF_TYPE_NORMAL
:
353 strbuf_addf(sb
, "%s/%s", refs
->gitcommondir
, refname
);
356 die("BUG: unknown ref type %d of ref %s",
357 ref_type(refname
), refname
);
362 * Get the packed_ref_cache for the specified files_ref_store,
363 * creating it if necessary.
365 static struct packed_ref_cache
*get_packed_ref_cache(struct files_ref_store
*refs
)
367 const char *packed_refs_file
= files_packed_refs_path(refs
);
370 !stat_validity_check(&refs
->packed
->validity
, packed_refs_file
))
371 clear_packed_ref_cache(refs
);
376 refs
->packed
= xcalloc(1, sizeof(*refs
->packed
));
377 acquire_packed_ref_cache(refs
->packed
);
378 refs
->packed
->cache
= create_ref_cache(&refs
->base
, NULL
);
379 refs
->packed
->cache
->root
->flag
&= ~REF_INCOMPLETE
;
380 f
= fopen(packed_refs_file
, "r");
382 stat_validity_update(&refs
->packed
->validity
, fileno(f
));
383 read_packed_refs(f
, get_ref_dir(refs
->packed
->cache
->root
));
390 static struct ref_dir
*get_packed_ref_dir(struct packed_ref_cache
*packed_ref_cache
)
392 return get_ref_dir(packed_ref_cache
->cache
->root
);
395 static struct ref_dir
*get_packed_refs(struct files_ref_store
*refs
)
397 return get_packed_ref_dir(get_packed_ref_cache(refs
));
401 * Add a reference to the in-memory packed reference cache. This may
402 * only be called while the packed-refs file is locked (see
403 * lock_packed_refs()). To actually write the packed-refs file, call
404 * commit_packed_refs().
406 static void add_packed_ref(struct files_ref_store
*refs
,
407 const char *refname
, const unsigned char *sha1
)
409 struct packed_ref_cache
*packed_ref_cache
= get_packed_ref_cache(refs
);
411 if (!packed_ref_cache
->lock
)
412 die("internal error: packed refs not locked");
413 add_ref_entry(get_packed_ref_dir(packed_ref_cache
),
414 create_ref_entry(refname
, sha1
, REF_ISPACKED
, 1));
418 * Read the loose references from the namespace dirname into dir
419 * (without recursing). dirname must end with '/'. dir must be the
420 * directory entry corresponding to dirname.
422 static void loose_fill_ref_dir(struct ref_store
*ref_store
,
423 struct ref_dir
*dir
, const char *dirname
)
425 struct files_ref_store
*refs
=
426 files_downcast(ref_store
, REF_STORE_READ
, "fill_ref_dir");
429 int dirnamelen
= strlen(dirname
);
430 struct strbuf refname
;
431 struct strbuf path
= STRBUF_INIT
;
434 files_ref_path(refs
, &path
, dirname
);
435 path_baselen
= path
.len
;
437 d
= opendir(path
.buf
);
439 strbuf_release(&path
);
443 strbuf_init(&refname
, dirnamelen
+ 257);
444 strbuf_add(&refname
, dirname
, dirnamelen
);
446 while ((de
= readdir(d
)) != NULL
) {
447 unsigned char sha1
[20];
451 if (de
->d_name
[0] == '.')
453 if (ends_with(de
->d_name
, ".lock"))
455 strbuf_addstr(&refname
, de
->d_name
);
456 strbuf_addstr(&path
, de
->d_name
);
457 if (stat(path
.buf
, &st
) < 0) {
458 ; /* silently ignore */
459 } else if (S_ISDIR(st
.st_mode
)) {
460 strbuf_addch(&refname
, '/');
461 add_entry_to_dir(dir
,
462 create_dir_entry(dir
->cache
, refname
.buf
,
465 if (!refs_resolve_ref_unsafe(&refs
->base
,
470 flag
|= REF_ISBROKEN
;
471 } else if (is_null_sha1(sha1
)) {
473 * It is so astronomically unlikely
474 * that NULL_SHA1 is the SHA-1 of an
475 * actual object that we consider its
476 * appearance in a loose reference
477 * file to be repo corruption
478 * (probably due to a software bug).
480 flag
|= REF_ISBROKEN
;
483 if (check_refname_format(refname
.buf
,
484 REFNAME_ALLOW_ONELEVEL
)) {
485 if (!refname_is_safe(refname
.buf
))
486 die("loose refname is dangerous: %s", refname
.buf
);
488 flag
|= REF_BAD_NAME
| REF_ISBROKEN
;
490 add_entry_to_dir(dir
,
491 create_ref_entry(refname
.buf
, sha1
, flag
, 0));
493 strbuf_setlen(&refname
, dirnamelen
);
494 strbuf_setlen(&path
, path_baselen
);
496 strbuf_release(&refname
);
497 strbuf_release(&path
);
501 * Manually add refs/bisect, which, being per-worktree, might
502 * not appear in the directory listing for refs/ in the main
505 if (!strcmp(dirname
, "refs/")) {
506 int pos
= search_ref_dir(dir
, "refs/bisect/", 12);
509 struct ref_entry
*child_entry
= create_dir_entry(
510 dir
->cache
, "refs/bisect/", 12, 1);
511 add_entry_to_dir(dir
, child_entry
);
516 static struct ref_cache
*get_loose_ref_cache(struct files_ref_store
*refs
)
520 * Mark the top-level directory complete because we
521 * are about to read the only subdirectory that can
524 refs
->loose
= create_ref_cache(&refs
->base
, loose_fill_ref_dir
);
526 /* We're going to fill the top level ourselves: */
527 refs
->loose
->root
->flag
&= ~REF_INCOMPLETE
;
530 * Add an incomplete entry for "refs/" (to be filled
533 add_entry_to_dir(get_ref_dir(refs
->loose
->root
),
534 create_dir_entry(refs
->loose
, "refs/", 5, 1));
540 * Return the ref_entry for the given refname from the packed
541 * references. If it does not exist, return NULL.
543 static struct ref_entry
*get_packed_ref(struct files_ref_store
*refs
,
546 return find_ref_entry(get_packed_refs(refs
), refname
);
550 * A loose ref file doesn't exist; check for a packed ref.
552 static int resolve_packed_ref(struct files_ref_store
*refs
,
554 unsigned char *sha1
, unsigned int *flags
)
556 struct ref_entry
*entry
;
559 * The loose reference file does not exist; check for a packed
562 entry
= get_packed_ref(refs
, refname
);
564 hashcpy(sha1
, entry
->u
.value
.oid
.hash
);
565 *flags
|= REF_ISPACKED
;
568 /* refname is not a packed reference. */
572 static int files_read_raw_ref(struct ref_store
*ref_store
,
573 const char *refname
, unsigned char *sha1
,
574 struct strbuf
*referent
, unsigned int *type
)
576 struct files_ref_store
*refs
=
577 files_downcast(ref_store
, REF_STORE_READ
, "read_raw_ref");
578 struct strbuf sb_contents
= STRBUF_INIT
;
579 struct strbuf sb_path
= STRBUF_INIT
;
586 int remaining_retries
= 3;
589 strbuf_reset(&sb_path
);
591 files_ref_path(refs
, &sb_path
, refname
);
597 * We might have to loop back here to avoid a race
598 * condition: first we lstat() the file, then we try
599 * to read it as a link or as a file. But if somebody
600 * changes the type of the file (file <-> directory
601 * <-> symlink) between the lstat() and reading, then
602 * we don't want to report that as an error but rather
603 * try again starting with the lstat().
605 * We'll keep a count of the retries, though, just to avoid
606 * any confusing situation sending us into an infinite loop.
609 if (remaining_retries
-- <= 0)
612 if (lstat(path
, &st
) < 0) {
615 if (resolve_packed_ref(refs
, refname
, sha1
, type
)) {
623 /* Follow "normalized" - ie "refs/.." symlinks by hand */
624 if (S_ISLNK(st
.st_mode
)) {
625 strbuf_reset(&sb_contents
);
626 if (strbuf_readlink(&sb_contents
, path
, 0) < 0) {
627 if (errno
== ENOENT
|| errno
== EINVAL
)
628 /* inconsistent with lstat; retry */
633 if (starts_with(sb_contents
.buf
, "refs/") &&
634 !check_refname_format(sb_contents
.buf
, 0)) {
635 strbuf_swap(&sb_contents
, referent
);
636 *type
|= REF_ISSYMREF
;
641 * It doesn't look like a refname; fall through to just
642 * treating it like a non-symlink, and reading whatever it
647 /* Is it a directory? */
648 if (S_ISDIR(st
.st_mode
)) {
650 * Even though there is a directory where the loose
651 * ref is supposed to be, there could still be a
654 if (resolve_packed_ref(refs
, refname
, sha1
, type
)) {
663 * Anything else, just open it and try to use it as
666 fd
= open(path
, O_RDONLY
);
668 if (errno
== ENOENT
&& !S_ISLNK(st
.st_mode
))
669 /* inconsistent with lstat; retry */
674 strbuf_reset(&sb_contents
);
675 if (strbuf_read(&sb_contents
, fd
, 256) < 0) {
676 int save_errno
= errno
;
682 strbuf_rtrim(&sb_contents
);
683 buf
= sb_contents
.buf
;
684 if (starts_with(buf
, "ref:")) {
686 while (isspace(*buf
))
689 strbuf_reset(referent
);
690 strbuf_addstr(referent
, buf
);
691 *type
|= REF_ISSYMREF
;
697 * Please note that FETCH_HEAD has additional
698 * data after the sha.
700 if (get_sha1_hex(buf
, sha1
) ||
701 (buf
[40] != '\0' && !isspace(buf
[40]))) {
702 *type
|= REF_ISBROKEN
;
711 strbuf_release(&sb_path
);
712 strbuf_release(&sb_contents
);
717 static void unlock_ref(struct ref_lock
*lock
)
719 /* Do not free lock->lk -- atexit() still looks at them */
721 rollback_lock_file(lock
->lk
);
722 free(lock
->ref_name
);
727 * Lock refname, without following symrefs, and set *lock_p to point
728 * at a newly-allocated lock object. Fill in lock->old_oid, referent,
729 * and type similarly to read_raw_ref().
731 * The caller must verify that refname is a "safe" reference name (in
732 * the sense of refname_is_safe()) before calling this function.
734 * If the reference doesn't already exist, verify that refname doesn't
735 * have a D/F conflict with any existing references. extras and skip
736 * are passed to refs_verify_refname_available() for this check.
738 * If mustexist is not set and the reference is not found or is
739 * broken, lock the reference anyway but clear sha1.
741 * Return 0 on success. On failure, write an error message to err and
742 * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR.
744 * Implementation note: This function is basically
749 * but it includes a lot more code to
750 * - Deal with possible races with other processes
751 * - Avoid calling refs_verify_refname_available() when it can be
752 * avoided, namely if we were successfully able to read the ref
753 * - Generate informative error messages in the case of failure
755 static int lock_raw_ref(struct files_ref_store
*refs
,
756 const char *refname
, int mustexist
,
757 const struct string_list
*extras
,
758 const struct string_list
*skip
,
759 struct ref_lock
**lock_p
,
760 struct strbuf
*referent
,
764 struct ref_lock
*lock
;
765 struct strbuf ref_file
= STRBUF_INIT
;
766 int attempts_remaining
= 3;
767 int ret
= TRANSACTION_GENERIC_ERROR
;
770 files_assert_main_repository(refs
, "lock_raw_ref");
774 /* First lock the file so it can't change out from under us. */
776 *lock_p
= lock
= xcalloc(1, sizeof(*lock
));
778 lock
->ref_name
= xstrdup(refname
);
779 files_ref_path(refs
, &ref_file
, refname
);
782 switch (safe_create_leading_directories(ref_file
.buf
)) {
787 * Suppose refname is "refs/foo/bar". We just failed
788 * to create the containing directory, "refs/foo",
789 * because there was a non-directory in the way. This
790 * indicates a D/F conflict, probably because of
791 * another reference such as "refs/foo". There is no
792 * reason to expect this error to be transitory.
794 if (refs_verify_refname_available(&refs
->base
, refname
,
795 extras
, skip
, err
)) {
798 * To the user the relevant error is
799 * that the "mustexist" reference is
803 strbuf_addf(err
, "unable to resolve reference '%s'",
807 * The error message set by
808 * refs_verify_refname_available() is
811 ret
= TRANSACTION_NAME_CONFLICT
;
815 * The file that is in the way isn't a loose
816 * reference. Report it as a low-level
819 strbuf_addf(err
, "unable to create lock file %s.lock; "
820 "non-directory in the way",
825 /* Maybe another process was tidying up. Try again. */
826 if (--attempts_remaining
> 0)
830 strbuf_addf(err
, "unable to create directory for %s",
836 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
838 if (hold_lock_file_for_update(lock
->lk
, ref_file
.buf
, LOCK_NO_DEREF
) < 0) {
839 if (errno
== ENOENT
&& --attempts_remaining
> 0) {
841 * Maybe somebody just deleted one of the
842 * directories leading to ref_file. Try
847 unable_to_lock_message(ref_file
.buf
, errno
, err
);
853 * Now we hold the lock and can read the reference without
854 * fear that its value will change.
857 if (files_read_raw_ref(&refs
->base
, refname
,
858 lock
->old_oid
.hash
, referent
, type
)) {
859 if (errno
== ENOENT
) {
861 /* Garden variety missing reference. */
862 strbuf_addf(err
, "unable to resolve reference '%s'",
867 * Reference is missing, but that's OK. We
868 * know that there is not a conflict with
869 * another loose reference because
870 * (supposing that we are trying to lock
871 * reference "refs/foo/bar"):
873 * - We were successfully able to create
874 * the lockfile refs/foo/bar.lock, so we
875 * know there cannot be a loose reference
878 * - We got ENOENT and not EISDIR, so we
879 * know that there cannot be a loose
880 * reference named "refs/foo/bar/baz".
883 } else if (errno
== EISDIR
) {
885 * There is a directory in the way. It might have
886 * contained references that have been deleted. If
887 * we don't require that the reference already
888 * exists, try to remove the directory so that it
889 * doesn't cause trouble when we want to rename the
890 * lockfile into place later.
893 /* Garden variety missing reference. */
894 strbuf_addf(err
, "unable to resolve reference '%s'",
897 } else if (remove_dir_recursively(&ref_file
,
898 REMOVE_DIR_EMPTY_ONLY
)) {
899 if (refs_verify_refname_available(
900 &refs
->base
, refname
,
901 extras
, skip
, err
)) {
903 * The error message set by
904 * verify_refname_available() is OK.
906 ret
= TRANSACTION_NAME_CONFLICT
;
910 * We can't delete the directory,
911 * but we also don't know of any
912 * references that it should
915 strbuf_addf(err
, "there is a non-empty directory '%s' "
916 "blocking reference '%s'",
917 ref_file
.buf
, refname
);
921 } else if (errno
== EINVAL
&& (*type
& REF_ISBROKEN
)) {
922 strbuf_addf(err
, "unable to resolve reference '%s': "
923 "reference broken", refname
);
926 strbuf_addf(err
, "unable to resolve reference '%s': %s",
927 refname
, strerror(errno
));
932 * If the ref did not exist and we are creating it,
933 * make sure there is no existing ref that conflicts
936 if (refs_verify_refname_available(
937 &refs
->base
, refname
,
950 strbuf_release(&ref_file
);
954 static int files_peel_ref(struct ref_store
*ref_store
,
955 const char *refname
, unsigned char *sha1
)
957 struct files_ref_store
*refs
=
958 files_downcast(ref_store
, REF_STORE_READ
| REF_STORE_ODB
,
961 unsigned char base
[20];
963 if (current_ref_iter
&& current_ref_iter
->refname
== refname
) {
964 struct object_id peeled
;
966 if (ref_iterator_peel(current_ref_iter
, &peeled
))
968 hashcpy(sha1
, peeled
.hash
);
972 if (refs_read_ref_full(ref_store
, refname
,
973 RESOLVE_REF_READING
, base
, &flag
))
977 * If the reference is packed, read its ref_entry from the
978 * cache in the hope that we already know its peeled value.
979 * We only try this optimization on packed references because
980 * (a) forcing the filling of the loose reference cache could
981 * be expensive and (b) loose references anyway usually do not
982 * have REF_KNOWS_PEELED.
984 if (flag
& REF_ISPACKED
) {
985 struct ref_entry
*r
= get_packed_ref(refs
, refname
);
987 if (peel_entry(r
, 0))
989 hashcpy(sha1
, r
->u
.value
.peeled
.hash
);
994 return peel_object(base
, sha1
);
997 struct files_ref_iterator
{
998 struct ref_iterator base
;
1000 struct packed_ref_cache
*packed_ref_cache
;
1001 struct ref_iterator
*iter0
;
1005 static int files_ref_iterator_advance(struct ref_iterator
*ref_iterator
)
1007 struct files_ref_iterator
*iter
=
1008 (struct files_ref_iterator
*)ref_iterator
;
1011 while ((ok
= ref_iterator_advance(iter
->iter0
)) == ITER_OK
) {
1012 if (iter
->flags
& DO_FOR_EACH_PER_WORKTREE_ONLY
&&
1013 ref_type(iter
->iter0
->refname
) != REF_TYPE_PER_WORKTREE
)
1016 if (!(iter
->flags
& DO_FOR_EACH_INCLUDE_BROKEN
) &&
1017 !ref_resolves_to_object(iter
->iter0
->refname
,
1019 iter
->iter0
->flags
))
1022 iter
->base
.refname
= iter
->iter0
->refname
;
1023 iter
->base
.oid
= iter
->iter0
->oid
;
1024 iter
->base
.flags
= iter
->iter0
->flags
;
1029 if (ref_iterator_abort(ref_iterator
) != ITER_DONE
)
1035 static int files_ref_iterator_peel(struct ref_iterator
*ref_iterator
,
1036 struct object_id
*peeled
)
1038 struct files_ref_iterator
*iter
=
1039 (struct files_ref_iterator
*)ref_iterator
;
1041 return ref_iterator_peel(iter
->iter0
, peeled
);
1044 static int files_ref_iterator_abort(struct ref_iterator
*ref_iterator
)
1046 struct files_ref_iterator
*iter
=
1047 (struct files_ref_iterator
*)ref_iterator
;
1051 ok
= ref_iterator_abort(iter
->iter0
);
1053 release_packed_ref_cache(iter
->packed_ref_cache
);
1054 base_ref_iterator_free(ref_iterator
);
1058 static struct ref_iterator_vtable files_ref_iterator_vtable
= {
1059 files_ref_iterator_advance
,
1060 files_ref_iterator_peel
,
1061 files_ref_iterator_abort
1064 static struct ref_iterator
*files_ref_iterator_begin(
1065 struct ref_store
*ref_store
,
1066 const char *prefix
, unsigned int flags
)
1068 struct files_ref_store
*refs
;
1069 struct ref_iterator
*loose_iter
, *packed_iter
;
1070 struct files_ref_iterator
*iter
;
1071 struct ref_iterator
*ref_iterator
;
1073 if (ref_paranoia
< 0)
1074 ref_paranoia
= git_env_bool("GIT_REF_PARANOIA", 0);
1076 flags
|= DO_FOR_EACH_INCLUDE_BROKEN
;
1078 refs
= files_downcast(ref_store
,
1079 REF_STORE_READ
| (ref_paranoia
? 0 : REF_STORE_ODB
),
1080 "ref_iterator_begin");
1082 iter
= xcalloc(1, sizeof(*iter
));
1083 ref_iterator
= &iter
->base
;
1084 base_ref_iterator_init(ref_iterator
, &files_ref_iterator_vtable
);
1087 * We must make sure that all loose refs are read before
1088 * accessing the packed-refs file; this avoids a race
1089 * condition if loose refs are migrated to the packed-refs
1090 * file by a simultaneous process, but our in-memory view is
1091 * from before the migration. We ensure this as follows:
1092 * First, we call start the loose refs iteration with its
1093 * `prime_ref` argument set to true. This causes the loose
1094 * references in the subtree to be pre-read into the cache.
1095 * (If they've already been read, that's OK; we only need to
1096 * guarantee that they're read before the packed refs, not
1097 * *how much* before.) After that, we call
1098 * get_packed_ref_cache(), which internally checks whether the
1099 * packed-ref cache is up to date with what is on disk, and
1100 * re-reads it if not.
1103 loose_iter
= cache_ref_iterator_begin(get_loose_ref_cache(refs
),
1106 iter
->packed_ref_cache
= get_packed_ref_cache(refs
);
1107 acquire_packed_ref_cache(iter
->packed_ref_cache
);
1108 packed_iter
= cache_ref_iterator_begin(iter
->packed_ref_cache
->cache
,
1111 iter
->iter0
= overlay_ref_iterator_begin(loose_iter
, packed_iter
);
1112 iter
->flags
= flags
;
1114 return ref_iterator
;
1118 * Verify that the reference locked by lock has the value old_sha1.
1119 * Fail if the reference doesn't exist and mustexist is set. Return 0
1120 * on success. On error, write an error message to err, set errno, and
1121 * return a negative value.
1123 static int verify_lock(struct ref_store
*ref_store
, struct ref_lock
*lock
,
1124 const unsigned char *old_sha1
, int mustexist
,
1129 if (refs_read_ref_full(ref_store
, lock
->ref_name
,
1130 mustexist
? RESOLVE_REF_READING
: 0,
1131 lock
->old_oid
.hash
, NULL
)) {
1133 int save_errno
= errno
;
1134 strbuf_addf(err
, "can't verify ref '%s'", lock
->ref_name
);
1138 oidclr(&lock
->old_oid
);
1142 if (old_sha1
&& hashcmp(lock
->old_oid
.hash
, old_sha1
)) {
1143 strbuf_addf(err
, "ref '%s' is at %s but expected %s",
1145 oid_to_hex(&lock
->old_oid
),
1146 sha1_to_hex(old_sha1
));
1153 static int remove_empty_directories(struct strbuf
*path
)
1156 * we want to create a file but there is a directory there;
1157 * if that is an empty directory (or a directory that contains
1158 * only empty directories), remove them.
1160 return remove_dir_recursively(path
, REMOVE_DIR_EMPTY_ONLY
);
1163 static int create_reflock(const char *path
, void *cb
)
1165 struct lock_file
*lk
= cb
;
1167 return hold_lock_file_for_update(lk
, path
, LOCK_NO_DEREF
) < 0 ? -1 : 0;
1171 * Locks a ref returning the lock on success and NULL on failure.
1172 * On failure errno is set to something meaningful.
1174 static struct ref_lock
*lock_ref_sha1_basic(struct files_ref_store
*refs
,
1175 const char *refname
,
1176 const unsigned char *old_sha1
,
1177 const struct string_list
*extras
,
1178 const struct string_list
*skip
,
1179 unsigned int flags
, int *type
,
1182 struct strbuf ref_file
= STRBUF_INIT
;
1183 struct ref_lock
*lock
;
1185 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1186 int resolve_flags
= RESOLVE_REF_NO_RECURSE
;
1189 files_assert_main_repository(refs
, "lock_ref_sha1_basic");
1192 lock
= xcalloc(1, sizeof(struct ref_lock
));
1195 resolve_flags
|= RESOLVE_REF_READING
;
1196 if (flags
& REF_DELETING
)
1197 resolve_flags
|= RESOLVE_REF_ALLOW_BAD_NAME
;
1199 files_ref_path(refs
, &ref_file
, refname
);
1200 resolved
= !!refs_resolve_ref_unsafe(&refs
->base
,
1201 refname
, resolve_flags
,
1202 lock
->old_oid
.hash
, type
);
1203 if (!resolved
&& errno
== EISDIR
) {
1205 * we are trying to lock foo but we used to
1206 * have foo/bar which now does not exist;
1207 * it is normal for the empty directory 'foo'
1210 if (remove_empty_directories(&ref_file
)) {
1212 if (!refs_verify_refname_available(
1214 refname
, extras
, skip
, err
))
1215 strbuf_addf(err
, "there are still refs under '%s'",
1219 resolved
= !!refs_resolve_ref_unsafe(&refs
->base
,
1220 refname
, resolve_flags
,
1221 lock
->old_oid
.hash
, type
);
1225 if (last_errno
!= ENOTDIR
||
1226 !refs_verify_refname_available(&refs
->base
, refname
,
1228 strbuf_addf(err
, "unable to resolve reference '%s': %s",
1229 refname
, strerror(last_errno
));
1235 * If the ref did not exist and we are creating it, make sure
1236 * there is no existing packed ref whose name begins with our
1237 * refname, nor a packed ref whose name is a proper prefix of
1240 if (is_null_oid(&lock
->old_oid
) &&
1241 refs_verify_refname_available(&refs
->base
, refname
,
1242 extras
, skip
, err
)) {
1243 last_errno
= ENOTDIR
;
1247 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1249 lock
->ref_name
= xstrdup(refname
);
1251 if (raceproof_create_file(ref_file
.buf
, create_reflock
, lock
->lk
)) {
1253 unable_to_lock_message(ref_file
.buf
, errno
, err
);
1257 if (verify_lock(&refs
->base
, lock
, old_sha1
, mustexist
, err
)) {
1268 strbuf_release(&ref_file
);
1274 * Write an entry to the packed-refs file for the specified refname.
1275 * If peeled is non-NULL, write it as the entry's peeled value.
1277 static void write_packed_entry(FILE *fh
, const char *refname
,
1278 const unsigned char *sha1
,
1279 const unsigned char *peeled
)
1281 fprintf_or_die(fh
, "%s %s\n", sha1_to_hex(sha1
), refname
);
1283 fprintf_or_die(fh
, "^%s\n", sha1_to_hex(peeled
));
1287 * Lock the packed-refs file for writing. Flags is passed to
1288 * hold_lock_file_for_update(). Return 0 on success. On errors, set
1289 * errno appropriately and return a nonzero value.
1291 static int lock_packed_refs(struct files_ref_store
*refs
, int flags
)
1293 static int timeout_configured
= 0;
1294 static int timeout_value
= 1000;
1295 struct packed_ref_cache
*packed_ref_cache
;
1297 files_assert_main_repository(refs
, "lock_packed_refs");
1299 if (!timeout_configured
) {
1300 git_config_get_int("core.packedrefstimeout", &timeout_value
);
1301 timeout_configured
= 1;
1304 if (hold_lock_file_for_update_timeout(
1305 &packlock
, files_packed_refs_path(refs
),
1306 flags
, timeout_value
) < 0)
1309 * Get the current packed-refs while holding the lock. If the
1310 * packed-refs file has been modified since we last read it,
1311 * this will automatically invalidate the cache and re-read
1312 * the packed-refs file.
1314 packed_ref_cache
= get_packed_ref_cache(refs
);
1315 packed_ref_cache
->lock
= &packlock
;
1316 /* Increment the reference count to prevent it from being freed: */
1317 acquire_packed_ref_cache(packed_ref_cache
);
1322 * Write the current version of the packed refs cache from memory to
1323 * disk. The packed-refs file must already be locked for writing (see
1324 * lock_packed_refs()). Return zero on success. On errors, set errno
1325 * and return a nonzero value
1327 static int commit_packed_refs(struct files_ref_store
*refs
)
1329 struct packed_ref_cache
*packed_ref_cache
=
1330 get_packed_ref_cache(refs
);
1334 struct ref_iterator
*iter
;
1336 files_assert_main_repository(refs
, "commit_packed_refs");
1338 if (!packed_ref_cache
->lock
)
1339 die("internal error: packed-refs not locked");
1341 out
= fdopen_lock_file(packed_ref_cache
->lock
, "w");
1343 die_errno("unable to fdopen packed-refs descriptor");
1345 fprintf_or_die(out
, "%s", PACKED_REFS_HEADER
);
1347 iter
= cache_ref_iterator_begin(packed_ref_cache
->cache
, NULL
, 0);
1348 while ((ok
= ref_iterator_advance(iter
)) == ITER_OK
) {
1349 struct object_id peeled
;
1350 int peel_error
= ref_iterator_peel(iter
, &peeled
);
1352 write_packed_entry(out
, iter
->refname
, iter
->oid
->hash
,
1353 peel_error
? NULL
: peeled
.hash
);
1356 if (ok
!= ITER_DONE
)
1357 die("error while iterating over references");
1359 if (commit_lock_file(packed_ref_cache
->lock
)) {
1363 packed_ref_cache
->lock
= NULL
;
1364 release_packed_ref_cache(packed_ref_cache
);
1370 * Rollback the lockfile for the packed-refs file, and discard the
1371 * in-memory packed reference cache. (The packed-refs file will be
1372 * read anew if it is needed again after this function is called.)
1374 static void rollback_packed_refs(struct files_ref_store
*refs
)
1376 struct packed_ref_cache
*packed_ref_cache
=
1377 get_packed_ref_cache(refs
);
1379 files_assert_main_repository(refs
, "rollback_packed_refs");
1381 if (!packed_ref_cache
->lock
)
1382 die("internal error: packed-refs not locked");
1383 rollback_lock_file(packed_ref_cache
->lock
);
1384 packed_ref_cache
->lock
= NULL
;
1385 release_packed_ref_cache(packed_ref_cache
);
1386 clear_packed_ref_cache(refs
);
1389 struct ref_to_prune
{
1390 struct ref_to_prune
*next
;
1391 unsigned char sha1
[20];
1392 char name
[FLEX_ARRAY
];
1396 REMOVE_EMPTY_PARENTS_REF
= 0x01,
1397 REMOVE_EMPTY_PARENTS_REFLOG
= 0x02
1401 * Remove empty parent directories associated with the specified
1402 * reference and/or its reflog, but spare [logs/]refs/ and immediate
1403 * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or
1404 * REMOVE_EMPTY_PARENTS_REFLOG.
1406 static void try_remove_empty_parents(struct files_ref_store
*refs
,
1407 const char *refname
,
1410 struct strbuf buf
= STRBUF_INIT
;
1411 struct strbuf sb
= STRBUF_INIT
;
1415 strbuf_addstr(&buf
, refname
);
1417 for (i
= 0; i
< 2; i
++) { /* refs/{heads,tags,...}/ */
1418 while (*p
&& *p
!= '/')
1420 /* tolerate duplicate slashes; see check_refname_format() */
1424 q
= buf
.buf
+ buf
.len
;
1425 while (flags
& (REMOVE_EMPTY_PARENTS_REF
| REMOVE_EMPTY_PARENTS_REFLOG
)) {
1426 while (q
> p
&& *q
!= '/')
1428 while (q
> p
&& *(q
-1) == '/')
1432 strbuf_setlen(&buf
, q
- buf
.buf
);
1435 files_ref_path(refs
, &sb
, buf
.buf
);
1436 if ((flags
& REMOVE_EMPTY_PARENTS_REF
) && rmdir(sb
.buf
))
1437 flags
&= ~REMOVE_EMPTY_PARENTS_REF
;
1440 files_reflog_path(refs
, &sb
, buf
.buf
);
1441 if ((flags
& REMOVE_EMPTY_PARENTS_REFLOG
) && rmdir(sb
.buf
))
1442 flags
&= ~REMOVE_EMPTY_PARENTS_REFLOG
;
1444 strbuf_release(&buf
);
1445 strbuf_release(&sb
);
1448 /* make sure nobody touched the ref, and unlink */
1449 static void prune_ref(struct files_ref_store
*refs
, struct ref_to_prune
*r
)
1451 struct ref_transaction
*transaction
;
1452 struct strbuf err
= STRBUF_INIT
;
1454 if (check_refname_format(r
->name
, 0))
1457 transaction
= ref_store_transaction_begin(&refs
->base
, &err
);
1459 ref_transaction_delete(transaction
, r
->name
, r
->sha1
,
1460 REF_ISPRUNING
| REF_NODEREF
, NULL
, &err
) ||
1461 ref_transaction_commit(transaction
, &err
)) {
1462 ref_transaction_free(transaction
);
1463 error("%s", err
.buf
);
1464 strbuf_release(&err
);
1467 ref_transaction_free(transaction
);
1468 strbuf_release(&err
);
1471 static void prune_refs(struct files_ref_store
*refs
, struct ref_to_prune
*r
)
1479 static int files_pack_refs(struct ref_store
*ref_store
, unsigned int flags
)
1481 struct files_ref_store
*refs
=
1482 files_downcast(ref_store
, REF_STORE_WRITE
| REF_STORE_ODB
,
1484 struct ref_iterator
*iter
;
1485 struct ref_dir
*packed_refs
;
1487 struct ref_to_prune
*refs_to_prune
= NULL
;
1489 lock_packed_refs(refs
, LOCK_DIE_ON_ERROR
);
1490 packed_refs
= get_packed_refs(refs
);
1492 iter
= cache_ref_iterator_begin(get_loose_ref_cache(refs
), NULL
, 0);
1493 while ((ok
= ref_iterator_advance(iter
)) == ITER_OK
) {
1495 * If the loose reference can be packed, add an entry
1496 * in the packed ref cache. If the reference should be
1497 * pruned, also add it to refs_to_prune.
1499 struct ref_entry
*packed_entry
;
1500 int is_tag_ref
= starts_with(iter
->refname
, "refs/tags/");
1502 /* Do not pack per-worktree refs: */
1503 if (ref_type(iter
->refname
) != REF_TYPE_NORMAL
)
1506 /* ALWAYS pack tags */
1507 if (!(flags
& PACK_REFS_ALL
) && !is_tag_ref
)
1510 /* Do not pack symbolic or broken refs: */
1511 if (iter
->flags
& REF_ISSYMREF
)
1514 if (!ref_resolves_to_object(iter
->refname
, iter
->oid
, iter
->flags
))
1518 * Create an entry in the packed-refs cache equivalent
1519 * to the one from the loose ref cache, except that
1520 * we don't copy the peeled status, because we want it
1523 packed_entry
= find_ref_entry(packed_refs
, iter
->refname
);
1525 /* Overwrite existing packed entry with info from loose entry */
1526 packed_entry
->flag
= REF_ISPACKED
;
1527 oidcpy(&packed_entry
->u
.value
.oid
, iter
->oid
);
1529 packed_entry
= create_ref_entry(iter
->refname
, iter
->oid
->hash
,
1531 add_ref_entry(packed_refs
, packed_entry
);
1533 oidclr(&packed_entry
->u
.value
.peeled
);
1535 /* Schedule the loose reference for pruning if requested. */
1536 if ((flags
& PACK_REFS_PRUNE
)) {
1537 struct ref_to_prune
*n
;
1538 FLEX_ALLOC_STR(n
, name
, iter
->refname
);
1539 hashcpy(n
->sha1
, iter
->oid
->hash
);
1540 n
->next
= refs_to_prune
;
1544 if (ok
!= ITER_DONE
)
1545 die("error while iterating over references");
1547 if (commit_packed_refs(refs
))
1548 die_errno("unable to overwrite old ref-pack file");
1550 prune_refs(refs
, refs_to_prune
);
1555 * Rewrite the packed-refs file, omitting any refs listed in
1556 * 'refnames'. On error, leave packed-refs unchanged, write an error
1557 * message to 'err', and return a nonzero value.
1559 * The refs in 'refnames' needn't be sorted. `err` must not be NULL.
1561 static int repack_without_refs(struct files_ref_store
*refs
,
1562 struct string_list
*refnames
, struct strbuf
*err
)
1564 struct ref_dir
*packed
;
1565 struct string_list_item
*refname
;
1566 int ret
, needs_repacking
= 0, removed
= 0;
1568 files_assert_main_repository(refs
, "repack_without_refs");
1571 /* Look for a packed ref */
1572 for_each_string_list_item(refname
, refnames
) {
1573 if (get_packed_ref(refs
, refname
->string
)) {
1574 needs_repacking
= 1;
1579 /* Avoid locking if we have nothing to do */
1580 if (!needs_repacking
)
1581 return 0; /* no refname exists in packed refs */
1583 if (lock_packed_refs(refs
, 0)) {
1584 unable_to_lock_message(files_packed_refs_path(refs
), errno
, err
);
1587 packed
= get_packed_refs(refs
);
1589 /* Remove refnames from the cache */
1590 for_each_string_list_item(refname
, refnames
)
1591 if (remove_entry_from_dir(packed
, refname
->string
) != -1)
1595 * All packed entries disappeared while we were
1596 * acquiring the lock.
1598 rollback_packed_refs(refs
);
1602 /* Write what remains */
1603 ret
= commit_packed_refs(refs
);
1605 strbuf_addf(err
, "unable to overwrite old ref-pack file: %s",
1610 static int files_delete_refs(struct ref_store
*ref_store
,
1611 struct string_list
*refnames
, unsigned int flags
)
1613 struct files_ref_store
*refs
=
1614 files_downcast(ref_store
, REF_STORE_WRITE
, "delete_refs");
1615 struct strbuf err
= STRBUF_INIT
;
1621 result
= repack_without_refs(refs
, refnames
, &err
);
1624 * If we failed to rewrite the packed-refs file, then
1625 * it is unsafe to try to remove loose refs, because
1626 * doing so might expose an obsolete packed value for
1627 * a reference that might even point at an object that
1628 * has been garbage collected.
1630 if (refnames
->nr
== 1)
1631 error(_("could not delete reference %s: %s"),
1632 refnames
->items
[0].string
, err
.buf
);
1634 error(_("could not delete references: %s"), err
.buf
);
1639 for (i
= 0; i
< refnames
->nr
; i
++) {
1640 const char *refname
= refnames
->items
[i
].string
;
1642 if (refs_delete_ref(&refs
->base
, NULL
, refname
, NULL
, flags
))
1643 result
|= error(_("could not remove reference %s"), refname
);
1647 strbuf_release(&err
);
1652 * People using contrib's git-new-workdir have .git/logs/refs ->
1653 * /some/other/path/.git/logs/refs, and that may live on another device.
1655 * IOW, to avoid cross device rename errors, the temporary renamed log must
1656 * live into logs/refs.
1658 #define TMP_RENAMED_LOG "refs/.tmp-renamed-log"
1661 const char *tmp_renamed_log
;
1665 static int rename_tmp_log_callback(const char *path
, void *cb_data
)
1667 struct rename_cb
*cb
= cb_data
;
1669 if (rename(cb
->tmp_renamed_log
, path
)) {
1671 * rename(a, b) when b is an existing directory ought
1672 * to result in ISDIR, but Solaris 5.8 gives ENOTDIR.
1673 * Sheesh. Record the true errno for error reporting,
1674 * but report EISDIR to raceproof_create_file() so
1675 * that it knows to retry.
1677 cb
->true_errno
= errno
;
1678 if (errno
== ENOTDIR
)
1686 static int rename_tmp_log(struct files_ref_store
*refs
, const char *newrefname
)
1688 struct strbuf path
= STRBUF_INIT
;
1689 struct strbuf tmp
= STRBUF_INIT
;
1690 struct rename_cb cb
;
1693 files_reflog_path(refs
, &path
, newrefname
);
1694 files_reflog_path(refs
, &tmp
, TMP_RENAMED_LOG
);
1695 cb
.tmp_renamed_log
= tmp
.buf
;
1696 ret
= raceproof_create_file(path
.buf
, rename_tmp_log_callback
, &cb
);
1698 if (errno
== EISDIR
)
1699 error("directory not empty: %s", path
.buf
);
1701 error("unable to move logfile %s to %s: %s",
1703 strerror(cb
.true_errno
));
1706 strbuf_release(&path
);
1707 strbuf_release(&tmp
);
1711 static int write_ref_to_lockfile(struct ref_lock
*lock
,
1712 const unsigned char *sha1
, struct strbuf
*err
);
1713 static int commit_ref_update(struct files_ref_store
*refs
,
1714 struct ref_lock
*lock
,
1715 const unsigned char *sha1
, const char *logmsg
,
1716 struct strbuf
*err
);
1718 static int files_rename_ref(struct ref_store
*ref_store
,
1719 const char *oldrefname
, const char *newrefname
,
1722 struct files_ref_store
*refs
=
1723 files_downcast(ref_store
, REF_STORE_WRITE
, "rename_ref");
1724 unsigned char sha1
[20], orig_sha1
[20];
1725 int flag
= 0, logmoved
= 0;
1726 struct ref_lock
*lock
;
1727 struct stat loginfo
;
1728 struct strbuf sb_oldref
= STRBUF_INIT
;
1729 struct strbuf sb_newref
= STRBUF_INIT
;
1730 struct strbuf tmp_renamed_log
= STRBUF_INIT
;
1732 struct strbuf err
= STRBUF_INIT
;
1734 files_reflog_path(refs
, &sb_oldref
, oldrefname
);
1735 files_reflog_path(refs
, &sb_newref
, newrefname
);
1736 files_reflog_path(refs
, &tmp_renamed_log
, TMP_RENAMED_LOG
);
1738 log
= !lstat(sb_oldref
.buf
, &loginfo
);
1739 if (log
&& S_ISLNK(loginfo
.st_mode
)) {
1740 ret
= error("reflog for %s is a symlink", oldrefname
);
1744 if (!refs_resolve_ref_unsafe(&refs
->base
, oldrefname
,
1745 RESOLVE_REF_READING
| RESOLVE_REF_NO_RECURSE
,
1746 orig_sha1
, &flag
)) {
1747 ret
= error("refname %s not found", oldrefname
);
1751 if (flag
& REF_ISSYMREF
) {
1752 ret
= error("refname %s is a symbolic ref, renaming it is not supported",
1756 if (!refs_rename_ref_available(&refs
->base
, oldrefname
, newrefname
)) {
1761 if (log
&& rename(sb_oldref
.buf
, tmp_renamed_log
.buf
)) {
1762 ret
= error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG
": %s",
1763 oldrefname
, strerror(errno
));
1767 if (refs_delete_ref(&refs
->base
, logmsg
, oldrefname
,
1768 orig_sha1
, REF_NODEREF
)) {
1769 error("unable to delete old %s", oldrefname
);
1774 * Since we are doing a shallow lookup, sha1 is not the
1775 * correct value to pass to delete_ref as old_sha1. But that
1776 * doesn't matter, because an old_sha1 check wouldn't add to
1777 * the safety anyway; we want to delete the reference whatever
1778 * its current value.
1780 if (!refs_read_ref_full(&refs
->base
, newrefname
,
1781 RESOLVE_REF_READING
| RESOLVE_REF_NO_RECURSE
,
1783 refs_delete_ref(&refs
->base
, NULL
, newrefname
,
1784 NULL
, REF_NODEREF
)) {
1785 if (errno
== EISDIR
) {
1786 struct strbuf path
= STRBUF_INIT
;
1789 files_ref_path(refs
, &path
, newrefname
);
1790 result
= remove_empty_directories(&path
);
1791 strbuf_release(&path
);
1794 error("Directory not empty: %s", newrefname
);
1798 error("unable to delete existing %s", newrefname
);
1803 if (log
&& rename_tmp_log(refs
, newrefname
))
1808 lock
= lock_ref_sha1_basic(refs
, newrefname
, NULL
, NULL
, NULL
,
1809 REF_NODEREF
, NULL
, &err
);
1811 error("unable to rename '%s' to '%s': %s", oldrefname
, newrefname
, err
.buf
);
1812 strbuf_release(&err
);
1815 hashcpy(lock
->old_oid
.hash
, orig_sha1
);
1817 if (write_ref_to_lockfile(lock
, orig_sha1
, &err
) ||
1818 commit_ref_update(refs
, lock
, orig_sha1
, logmsg
, &err
)) {
1819 error("unable to write current sha1 into %s: %s", newrefname
, err
.buf
);
1820 strbuf_release(&err
);
1828 lock
= lock_ref_sha1_basic(refs
, oldrefname
, NULL
, NULL
, NULL
,
1829 REF_NODEREF
, NULL
, &err
);
1831 error("unable to lock %s for rollback: %s", oldrefname
, err
.buf
);
1832 strbuf_release(&err
);
1836 flag
= log_all_ref_updates
;
1837 log_all_ref_updates
= LOG_REFS_NONE
;
1838 if (write_ref_to_lockfile(lock
, orig_sha1
, &err
) ||
1839 commit_ref_update(refs
, lock
, orig_sha1
, NULL
, &err
)) {
1840 error("unable to write current sha1 into %s: %s", oldrefname
, err
.buf
);
1841 strbuf_release(&err
);
1843 log_all_ref_updates
= flag
;
1846 if (logmoved
&& rename(sb_newref
.buf
, sb_oldref
.buf
))
1847 error("unable to restore logfile %s from %s: %s",
1848 oldrefname
, newrefname
, strerror(errno
));
1849 if (!logmoved
&& log
&&
1850 rename(tmp_renamed_log
.buf
, sb_oldref
.buf
))
1851 error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG
": %s",
1852 oldrefname
, strerror(errno
));
1855 strbuf_release(&sb_newref
);
1856 strbuf_release(&sb_oldref
);
1857 strbuf_release(&tmp_renamed_log
);
1862 static int close_ref(struct ref_lock
*lock
)
1864 if (close_lock_file(lock
->lk
))
1869 static int commit_ref(struct ref_lock
*lock
)
1871 char *path
= get_locked_file_path(lock
->lk
);
1874 if (!lstat(path
, &st
) && S_ISDIR(st
.st_mode
)) {
1876 * There is a directory at the path we want to rename
1877 * the lockfile to. Hopefully it is empty; try to
1880 size_t len
= strlen(path
);
1881 struct strbuf sb_path
= STRBUF_INIT
;
1883 strbuf_attach(&sb_path
, path
, len
, len
);
1886 * If this fails, commit_lock_file() will also fail
1887 * and will report the problem.
1889 remove_empty_directories(&sb_path
);
1890 strbuf_release(&sb_path
);
1895 if (commit_lock_file(lock
->lk
))
1900 static int open_or_create_logfile(const char *path
, void *cb
)
1904 *fd
= open(path
, O_APPEND
| O_WRONLY
| O_CREAT
, 0666);
1905 return (*fd
< 0) ? -1 : 0;
1909 * Create a reflog for a ref. If force_create = 0, only create the
1910 * reflog for certain refs (those for which should_autocreate_reflog
1911 * returns non-zero). Otherwise, create it regardless of the reference
1912 * name. If the logfile already existed or was created, return 0 and
1913 * set *logfd to the file descriptor opened for appending to the file.
1914 * If no logfile exists and we decided not to create one, return 0 and
1915 * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and
1918 static int log_ref_setup(struct files_ref_store
*refs
,
1919 const char *refname
, int force_create
,
1920 int *logfd
, struct strbuf
*err
)
1922 struct strbuf logfile_sb
= STRBUF_INIT
;
1925 files_reflog_path(refs
, &logfile_sb
, refname
);
1926 logfile
= strbuf_detach(&logfile_sb
, NULL
);
1928 if (force_create
|| should_autocreate_reflog(refname
)) {
1929 if (raceproof_create_file(logfile
, open_or_create_logfile
, logfd
)) {
1930 if (errno
== ENOENT
)
1931 strbuf_addf(err
, "unable to create directory for '%s': "
1932 "%s", logfile
, strerror(errno
));
1933 else if (errno
== EISDIR
)
1934 strbuf_addf(err
, "there are still logs under '%s'",
1937 strbuf_addf(err
, "unable to append to '%s': %s",
1938 logfile
, strerror(errno
));
1943 *logfd
= open(logfile
, O_APPEND
| O_WRONLY
, 0666);
1945 if (errno
== ENOENT
|| errno
== EISDIR
) {
1947 * The logfile doesn't already exist,
1948 * but that is not an error; it only
1949 * means that we won't write log
1954 strbuf_addf(err
, "unable to append to '%s': %s",
1955 logfile
, strerror(errno
));
1962 adjust_shared_perm(logfile
);
1972 static int files_create_reflog(struct ref_store
*ref_store
,
1973 const char *refname
, int force_create
,
1976 struct files_ref_store
*refs
=
1977 files_downcast(ref_store
, REF_STORE_WRITE
, "create_reflog");
1980 if (log_ref_setup(refs
, refname
, force_create
, &fd
, err
))
1989 static int log_ref_write_fd(int fd
, const unsigned char *old_sha1
,
1990 const unsigned char *new_sha1
,
1991 const char *committer
, const char *msg
)
1993 int msglen
, written
;
1994 unsigned maxlen
, len
;
1997 msglen
= msg
? strlen(msg
) : 0;
1998 maxlen
= strlen(committer
) + msglen
+ 100;
1999 logrec
= xmalloc(maxlen
);
2000 len
= xsnprintf(logrec
, maxlen
, "%s %s %s\n",
2001 sha1_to_hex(old_sha1
),
2002 sha1_to_hex(new_sha1
),
2005 len
+= copy_reflog_msg(logrec
+ len
- 1, msg
) - 1;
2007 written
= len
<= maxlen
? write_in_full(fd
, logrec
, len
) : -1;
2015 static int files_log_ref_write(struct files_ref_store
*refs
,
2016 const char *refname
, const unsigned char *old_sha1
,
2017 const unsigned char *new_sha1
, const char *msg
,
2018 int flags
, struct strbuf
*err
)
2022 if (log_all_ref_updates
== LOG_REFS_UNSET
)
2023 log_all_ref_updates
= is_bare_repository() ? LOG_REFS_NONE
: LOG_REFS_NORMAL
;
2025 result
= log_ref_setup(refs
, refname
,
2026 flags
& REF_FORCE_CREATE_REFLOG
,
2034 result
= log_ref_write_fd(logfd
, old_sha1
, new_sha1
,
2035 git_committer_info(0), msg
);
2037 struct strbuf sb
= STRBUF_INIT
;
2038 int save_errno
= errno
;
2040 files_reflog_path(refs
, &sb
, refname
);
2041 strbuf_addf(err
, "unable to append to '%s': %s",
2042 sb
.buf
, strerror(save_errno
));
2043 strbuf_release(&sb
);
2048 struct strbuf sb
= STRBUF_INIT
;
2049 int save_errno
= errno
;
2051 files_reflog_path(refs
, &sb
, refname
);
2052 strbuf_addf(err
, "unable to append to '%s': %s",
2053 sb
.buf
, strerror(save_errno
));
2054 strbuf_release(&sb
);
2061 * Write sha1 into the open lockfile, then close the lockfile. On
2062 * errors, rollback the lockfile, fill in *err and
2065 static int write_ref_to_lockfile(struct ref_lock
*lock
,
2066 const unsigned char *sha1
, struct strbuf
*err
)
2068 static char term
= '\n';
2072 o
= parse_object(sha1
);
2075 "trying to write ref '%s' with nonexistent object %s",
2076 lock
->ref_name
, sha1_to_hex(sha1
));
2080 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
2082 "trying to write non-commit object %s to branch '%s'",
2083 sha1_to_hex(sha1
), lock
->ref_name
);
2087 fd
= get_lock_file_fd(lock
->lk
);
2088 if (write_in_full(fd
, sha1_to_hex(sha1
), 40) != 40 ||
2089 write_in_full(fd
, &term
, 1) != 1 ||
2090 close_ref(lock
) < 0) {
2092 "couldn't write '%s'", get_lock_file_path(lock
->lk
));
2100 * Commit a change to a loose reference that has already been written
2101 * to the loose reference lockfile. Also update the reflogs if
2102 * necessary, using the specified lockmsg (which can be NULL).
2104 static int commit_ref_update(struct files_ref_store
*refs
,
2105 struct ref_lock
*lock
,
2106 const unsigned char *sha1
, const char *logmsg
,
2109 files_assert_main_repository(refs
, "commit_ref_update");
2111 clear_loose_ref_cache(refs
);
2112 if (files_log_ref_write(refs
, lock
->ref_name
,
2113 lock
->old_oid
.hash
, sha1
,
2115 char *old_msg
= strbuf_detach(err
, NULL
);
2116 strbuf_addf(err
, "cannot update the ref '%s': %s",
2117 lock
->ref_name
, old_msg
);
2123 if (strcmp(lock
->ref_name
, "HEAD") != 0) {
2125 * Special hack: If a branch is updated directly and HEAD
2126 * points to it (may happen on the remote side of a push
2127 * for example) then logically the HEAD reflog should be
2129 * A generic solution implies reverse symref information,
2130 * but finding all symrefs pointing to the given branch
2131 * would be rather costly for this rare event (the direct
2132 * update of a branch) to be worth it. So let's cheat and
2133 * check with HEAD only which should cover 99% of all usage
2134 * scenarios (even 100% of the default ones).
2136 unsigned char head_sha1
[20];
2138 const char *head_ref
;
2140 head_ref
= refs_resolve_ref_unsafe(&refs
->base
, "HEAD",
2141 RESOLVE_REF_READING
,
2142 head_sha1
, &head_flag
);
2143 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
2144 !strcmp(head_ref
, lock
->ref_name
)) {
2145 struct strbuf log_err
= STRBUF_INIT
;
2146 if (files_log_ref_write(refs
, "HEAD",
2147 lock
->old_oid
.hash
, sha1
,
2148 logmsg
, 0, &log_err
)) {
2149 error("%s", log_err
.buf
);
2150 strbuf_release(&log_err
);
2155 if (commit_ref(lock
)) {
2156 strbuf_addf(err
, "couldn't set '%s'", lock
->ref_name
);
2165 static int create_ref_symlink(struct ref_lock
*lock
, const char *target
)
2168 #ifndef NO_SYMLINK_HEAD
2169 char *ref_path
= get_locked_file_path(lock
->lk
);
2171 ret
= symlink(target
, ref_path
);
2175 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
2180 static void update_symref_reflog(struct files_ref_store
*refs
,
2181 struct ref_lock
*lock
, const char *refname
,
2182 const char *target
, const char *logmsg
)
2184 struct strbuf err
= STRBUF_INIT
;
2185 unsigned char new_sha1
[20];
2187 !refs_read_ref_full(&refs
->base
, target
,
2188 RESOLVE_REF_READING
, new_sha1
, NULL
) &&
2189 files_log_ref_write(refs
, refname
, lock
->old_oid
.hash
,
2190 new_sha1
, logmsg
, 0, &err
)) {
2191 error("%s", err
.buf
);
2192 strbuf_release(&err
);
2196 static int create_symref_locked(struct files_ref_store
*refs
,
2197 struct ref_lock
*lock
, const char *refname
,
2198 const char *target
, const char *logmsg
)
2200 if (prefer_symlink_refs
&& !create_ref_symlink(lock
, target
)) {
2201 update_symref_reflog(refs
, lock
, refname
, target
, logmsg
);
2205 if (!fdopen_lock_file(lock
->lk
, "w"))
2206 return error("unable to fdopen %s: %s",
2207 lock
->lk
->tempfile
.filename
.buf
, strerror(errno
));
2209 update_symref_reflog(refs
, lock
, refname
, target
, logmsg
);
2211 /* no error check; commit_ref will check ferror */
2212 fprintf(lock
->lk
->tempfile
.fp
, "ref: %s\n", target
);
2213 if (commit_ref(lock
) < 0)
2214 return error("unable to write symref for %s: %s", refname
,
2219 static int files_create_symref(struct ref_store
*ref_store
,
2220 const char *refname
, const char *target
,
2223 struct files_ref_store
*refs
=
2224 files_downcast(ref_store
, REF_STORE_WRITE
, "create_symref");
2225 struct strbuf err
= STRBUF_INIT
;
2226 struct ref_lock
*lock
;
2229 lock
= lock_ref_sha1_basic(refs
, refname
, NULL
,
2230 NULL
, NULL
, REF_NODEREF
, NULL
,
2233 error("%s", err
.buf
);
2234 strbuf_release(&err
);
2238 ret
= create_symref_locked(refs
, lock
, refname
, target
, logmsg
);
2243 int set_worktree_head_symref(const char *gitdir
, const char *target
, const char *logmsg
)
2246 * FIXME: this obviously will not work well for future refs
2247 * backends. This function needs to die.
2249 struct files_ref_store
*refs
=
2250 files_downcast(get_main_ref_store(),
2254 static struct lock_file head_lock
;
2255 struct ref_lock
*lock
;
2256 struct strbuf head_path
= STRBUF_INIT
;
2257 const char *head_rel
;
2260 strbuf_addf(&head_path
, "%s/HEAD", absolute_path(gitdir
));
2261 if (hold_lock_file_for_update(&head_lock
, head_path
.buf
,
2262 LOCK_NO_DEREF
) < 0) {
2263 struct strbuf err
= STRBUF_INIT
;
2264 unable_to_lock_message(head_path
.buf
, errno
, &err
);
2265 error("%s", err
.buf
);
2266 strbuf_release(&err
);
2267 strbuf_release(&head_path
);
2271 /* head_rel will be "HEAD" for the main tree, "worktrees/wt/HEAD" for
2273 head_rel
= remove_leading_path(head_path
.buf
,
2274 absolute_path(get_git_common_dir()));
2275 /* to make use of create_symref_locked(), initialize ref_lock */
2276 lock
= xcalloc(1, sizeof(struct ref_lock
));
2277 lock
->lk
= &head_lock
;
2278 lock
->ref_name
= xstrdup(head_rel
);
2280 ret
= create_symref_locked(refs
, lock
, head_rel
, target
, logmsg
);
2282 unlock_ref(lock
); /* will free lock */
2283 strbuf_release(&head_path
);
2287 static int files_reflog_exists(struct ref_store
*ref_store
,
2288 const char *refname
)
2290 struct files_ref_store
*refs
=
2291 files_downcast(ref_store
, REF_STORE_READ
, "reflog_exists");
2292 struct strbuf sb
= STRBUF_INIT
;
2296 files_reflog_path(refs
, &sb
, refname
);
2297 ret
= !lstat(sb
.buf
, &st
) && S_ISREG(st
.st_mode
);
2298 strbuf_release(&sb
);
2302 static int files_delete_reflog(struct ref_store
*ref_store
,
2303 const char *refname
)
2305 struct files_ref_store
*refs
=
2306 files_downcast(ref_store
, REF_STORE_WRITE
, "delete_reflog");
2307 struct strbuf sb
= STRBUF_INIT
;
2310 files_reflog_path(refs
, &sb
, refname
);
2311 ret
= remove_path(sb
.buf
);
2312 strbuf_release(&sb
);
2316 static int show_one_reflog_ent(struct strbuf
*sb
, each_reflog_ent_fn fn
, void *cb_data
)
2318 struct object_id ooid
, noid
;
2319 char *email_end
, *message
;
2320 unsigned long timestamp
;
2322 const char *p
= sb
->buf
;
2324 /* old SP new SP name <email> SP time TAB msg LF */
2325 if (!sb
->len
|| sb
->buf
[sb
->len
- 1] != '\n' ||
2326 parse_oid_hex(p
, &ooid
, &p
) || *p
++ != ' ' ||
2327 parse_oid_hex(p
, &noid
, &p
) || *p
++ != ' ' ||
2328 !(email_end
= strchr(p
, '>')) ||
2329 email_end
[1] != ' ' ||
2330 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
2331 !message
|| message
[0] != ' ' ||
2332 (message
[1] != '+' && message
[1] != '-') ||
2333 !isdigit(message
[2]) || !isdigit(message
[3]) ||
2334 !isdigit(message
[4]) || !isdigit(message
[5]))
2335 return 0; /* corrupt? */
2336 email_end
[1] = '\0';
2337 tz
= strtol(message
+ 1, NULL
, 10);
2338 if (message
[6] != '\t')
2342 return fn(&ooid
, &noid
, p
, timestamp
, tz
, message
, cb_data
);
2345 static char *find_beginning_of_line(char *bob
, char *scan
)
2347 while (bob
< scan
&& *(--scan
) != '\n')
2348 ; /* keep scanning backwards */
2350 * Return either beginning of the buffer, or LF at the end of
2351 * the previous line.
2356 static int files_for_each_reflog_ent_reverse(struct ref_store
*ref_store
,
2357 const char *refname
,
2358 each_reflog_ent_fn fn
,
2361 struct files_ref_store
*refs
=
2362 files_downcast(ref_store
, REF_STORE_READ
,
2363 "for_each_reflog_ent_reverse");
2364 struct strbuf sb
= STRBUF_INIT
;
2367 int ret
= 0, at_tail
= 1;
2369 files_reflog_path(refs
, &sb
, refname
);
2370 logfp
= fopen(sb
.buf
, "r");
2371 strbuf_release(&sb
);
2375 /* Jump to the end */
2376 if (fseek(logfp
, 0, SEEK_END
) < 0)
2377 ret
= error("cannot seek back reflog for %s: %s",
2378 refname
, strerror(errno
));
2380 while (!ret
&& 0 < pos
) {
2386 /* Fill next block from the end */
2387 cnt
= (sizeof(buf
) < pos
) ? sizeof(buf
) : pos
;
2388 if (fseek(logfp
, pos
- cnt
, SEEK_SET
)) {
2389 ret
= error("cannot seek back reflog for %s: %s",
2390 refname
, strerror(errno
));
2393 nread
= fread(buf
, cnt
, 1, logfp
);
2395 ret
= error("cannot read %d bytes from reflog for %s: %s",
2396 cnt
, refname
, strerror(errno
));
2401 scanp
= endp
= buf
+ cnt
;
2402 if (at_tail
&& scanp
[-1] == '\n')
2403 /* Looking at the final LF at the end of the file */
2407 while (buf
< scanp
) {
2409 * terminating LF of the previous line, or the beginning
2414 bp
= find_beginning_of_line(buf
, scanp
);
2418 * The newline is the end of the previous line,
2419 * so we know we have complete line starting
2420 * at (bp + 1). Prefix it onto any prior data
2421 * we collected for the line and process it.
2423 strbuf_splice(&sb
, 0, 0, bp
+ 1, endp
- (bp
+ 1));
2426 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2432 * We are at the start of the buffer, and the
2433 * start of the file; there is no previous
2434 * line, and we have everything for this one.
2435 * Process it, and we can end the loop.
2437 strbuf_splice(&sb
, 0, 0, buf
, endp
- buf
);
2438 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2445 * We are at the start of the buffer, and there
2446 * is more file to read backwards. Which means
2447 * we are in the middle of a line. Note that we
2448 * may get here even if *bp was a newline; that
2449 * just means we are at the exact end of the
2450 * previous line, rather than some spot in the
2453 * Save away what we have to be combined with
2454 * the data from the next read.
2456 strbuf_splice(&sb
, 0, 0, buf
, endp
- buf
);
2463 die("BUG: reverse reflog parser had leftover data");
2466 strbuf_release(&sb
);
2470 static int files_for_each_reflog_ent(struct ref_store
*ref_store
,
2471 const char *refname
,
2472 each_reflog_ent_fn fn
, void *cb_data
)
2474 struct files_ref_store
*refs
=
2475 files_downcast(ref_store
, REF_STORE_READ
,
2476 "for_each_reflog_ent");
2478 struct strbuf sb
= STRBUF_INIT
;
2481 files_reflog_path(refs
, &sb
, refname
);
2482 logfp
= fopen(sb
.buf
, "r");
2483 strbuf_release(&sb
);
2487 while (!ret
&& !strbuf_getwholeline(&sb
, logfp
, '\n'))
2488 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2490 strbuf_release(&sb
);
2494 struct files_reflog_iterator
{
2495 struct ref_iterator base
;
2497 struct ref_store
*ref_store
;
2498 struct dir_iterator
*dir_iterator
;
2499 struct object_id oid
;
2502 static int files_reflog_iterator_advance(struct ref_iterator
*ref_iterator
)
2504 struct files_reflog_iterator
*iter
=
2505 (struct files_reflog_iterator
*)ref_iterator
;
2506 struct dir_iterator
*diter
= iter
->dir_iterator
;
2509 while ((ok
= dir_iterator_advance(diter
)) == ITER_OK
) {
2512 if (!S_ISREG(diter
->st
.st_mode
))
2514 if (diter
->basename
[0] == '.')
2516 if (ends_with(diter
->basename
, ".lock"))
2519 if (refs_read_ref_full(iter
->ref_store
,
2520 diter
->relative_path
, 0,
2521 iter
->oid
.hash
, &flags
)) {
2522 error("bad ref for %s", diter
->path
.buf
);
2526 iter
->base
.refname
= diter
->relative_path
;
2527 iter
->base
.oid
= &iter
->oid
;
2528 iter
->base
.flags
= flags
;
2532 iter
->dir_iterator
= NULL
;
2533 if (ref_iterator_abort(ref_iterator
) == ITER_ERROR
)
2538 static int files_reflog_iterator_peel(struct ref_iterator
*ref_iterator
,
2539 struct object_id
*peeled
)
2541 die("BUG: ref_iterator_peel() called for reflog_iterator");
2544 static int files_reflog_iterator_abort(struct ref_iterator
*ref_iterator
)
2546 struct files_reflog_iterator
*iter
=
2547 (struct files_reflog_iterator
*)ref_iterator
;
2550 if (iter
->dir_iterator
)
2551 ok
= dir_iterator_abort(iter
->dir_iterator
);
2553 base_ref_iterator_free(ref_iterator
);
2557 static struct ref_iterator_vtable files_reflog_iterator_vtable
= {
2558 files_reflog_iterator_advance
,
2559 files_reflog_iterator_peel
,
2560 files_reflog_iterator_abort
2563 static struct ref_iterator
*files_reflog_iterator_begin(struct ref_store
*ref_store
)
2565 struct files_ref_store
*refs
=
2566 files_downcast(ref_store
, REF_STORE_READ
,
2567 "reflog_iterator_begin");
2568 struct files_reflog_iterator
*iter
= xcalloc(1, sizeof(*iter
));
2569 struct ref_iterator
*ref_iterator
= &iter
->base
;
2570 struct strbuf sb
= STRBUF_INIT
;
2572 base_ref_iterator_init(ref_iterator
, &files_reflog_iterator_vtable
);
2573 files_reflog_path(refs
, &sb
, NULL
);
2574 iter
->dir_iterator
= dir_iterator_begin(sb
.buf
);
2575 iter
->ref_store
= ref_store
;
2576 strbuf_release(&sb
);
2577 return ref_iterator
;
2580 static int ref_update_reject_duplicates(struct string_list
*refnames
,
2583 int i
, n
= refnames
->nr
;
2587 for (i
= 1; i
< n
; i
++)
2588 if (!strcmp(refnames
->items
[i
- 1].string
, refnames
->items
[i
].string
)) {
2590 "multiple updates for ref '%s' not allowed.",
2591 refnames
->items
[i
].string
);
2598 * If update is a direct update of head_ref (the reference pointed to
2599 * by HEAD), then add an extra REF_LOG_ONLY update for HEAD.
2601 static int split_head_update(struct ref_update
*update
,
2602 struct ref_transaction
*transaction
,
2603 const char *head_ref
,
2604 struct string_list
*affected_refnames
,
2607 struct string_list_item
*item
;
2608 struct ref_update
*new_update
;
2610 if ((update
->flags
& REF_LOG_ONLY
) ||
2611 (update
->flags
& REF_ISPRUNING
) ||
2612 (update
->flags
& REF_UPDATE_VIA_HEAD
))
2615 if (strcmp(update
->refname
, head_ref
))
2619 * First make sure that HEAD is not already in the
2620 * transaction. This insertion is O(N) in the transaction
2621 * size, but it happens at most once per transaction.
2623 item
= string_list_insert(affected_refnames
, "HEAD");
2625 /* An entry already existed */
2627 "multiple updates for 'HEAD' (including one "
2628 "via its referent '%s') are not allowed",
2630 return TRANSACTION_NAME_CONFLICT
;
2633 new_update
= ref_transaction_add_update(
2634 transaction
, "HEAD",
2635 update
->flags
| REF_LOG_ONLY
| REF_NODEREF
,
2636 update
->new_sha1
, update
->old_sha1
,
2639 item
->util
= new_update
;
2645 * update is for a symref that points at referent and doesn't have
2646 * REF_NODEREF set. Split it into two updates:
2647 * - The original update, but with REF_LOG_ONLY and REF_NODEREF set
2648 * - A new, separate update for the referent reference
2649 * Note that the new update will itself be subject to splitting when
2650 * the iteration gets to it.
2652 static int split_symref_update(struct files_ref_store
*refs
,
2653 struct ref_update
*update
,
2654 const char *referent
,
2655 struct ref_transaction
*transaction
,
2656 struct string_list
*affected_refnames
,
2659 struct string_list_item
*item
;
2660 struct ref_update
*new_update
;
2661 unsigned int new_flags
;
2664 * First make sure that referent is not already in the
2665 * transaction. This insertion is O(N) in the transaction
2666 * size, but it happens at most once per symref in a
2669 item
= string_list_insert(affected_refnames
, referent
);
2671 /* An entry already existed */
2673 "multiple updates for '%s' (including one "
2674 "via symref '%s') are not allowed",
2675 referent
, update
->refname
);
2676 return TRANSACTION_NAME_CONFLICT
;
2679 new_flags
= update
->flags
;
2680 if (!strcmp(update
->refname
, "HEAD")) {
2682 * Record that the new update came via HEAD, so that
2683 * when we process it, split_head_update() doesn't try
2684 * to add another reflog update for HEAD. Note that
2685 * this bit will be propagated if the new_update
2686 * itself needs to be split.
2688 new_flags
|= REF_UPDATE_VIA_HEAD
;
2691 new_update
= ref_transaction_add_update(
2692 transaction
, referent
, new_flags
,
2693 update
->new_sha1
, update
->old_sha1
,
2696 new_update
->parent_update
= update
;
2699 * Change the symbolic ref update to log only. Also, it
2700 * doesn't need to check its old SHA-1 value, as that will be
2701 * done when new_update is processed.
2703 update
->flags
|= REF_LOG_ONLY
| REF_NODEREF
;
2704 update
->flags
&= ~REF_HAVE_OLD
;
2706 item
->util
= new_update
;
2712 * Return the refname under which update was originally requested.
2714 static const char *original_update_refname(struct ref_update
*update
)
2716 while (update
->parent_update
)
2717 update
= update
->parent_update
;
2719 return update
->refname
;
2723 * Check whether the REF_HAVE_OLD and old_oid values stored in update
2724 * are consistent with oid, which is the reference's current value. If
2725 * everything is OK, return 0; otherwise, write an error message to
2726 * err and return -1.
2728 static int check_old_oid(struct ref_update
*update
, struct object_id
*oid
,
2731 if (!(update
->flags
& REF_HAVE_OLD
) ||
2732 !hashcmp(oid
->hash
, update
->old_sha1
))
2735 if (is_null_sha1(update
->old_sha1
))
2736 strbuf_addf(err
, "cannot lock ref '%s': "
2737 "reference already exists",
2738 original_update_refname(update
));
2739 else if (is_null_oid(oid
))
2740 strbuf_addf(err
, "cannot lock ref '%s': "
2741 "reference is missing but expected %s",
2742 original_update_refname(update
),
2743 sha1_to_hex(update
->old_sha1
));
2745 strbuf_addf(err
, "cannot lock ref '%s': "
2746 "is at %s but expected %s",
2747 original_update_refname(update
),
2749 sha1_to_hex(update
->old_sha1
));
2755 * Prepare for carrying out update:
2756 * - Lock the reference referred to by update.
2757 * - Read the reference under lock.
2758 * - Check that its old SHA-1 value (if specified) is correct, and in
2759 * any case record it in update->lock->old_oid for later use when
2760 * writing the reflog.
2761 * - If it is a symref update without REF_NODEREF, split it up into a
2762 * REF_LOG_ONLY update of the symref and add a separate update for
2763 * the referent to transaction.
2764 * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY
2767 static int lock_ref_for_update(struct files_ref_store
*refs
,
2768 struct ref_update
*update
,
2769 struct ref_transaction
*transaction
,
2770 const char *head_ref
,
2771 struct string_list
*affected_refnames
,
2774 struct strbuf referent
= STRBUF_INIT
;
2775 int mustexist
= (update
->flags
& REF_HAVE_OLD
) &&
2776 !is_null_sha1(update
->old_sha1
);
2778 struct ref_lock
*lock
;
2780 files_assert_main_repository(refs
, "lock_ref_for_update");
2782 if ((update
->flags
& REF_HAVE_NEW
) && is_null_sha1(update
->new_sha1
))
2783 update
->flags
|= REF_DELETING
;
2786 ret
= split_head_update(update
, transaction
, head_ref
,
2787 affected_refnames
, err
);
2792 ret
= lock_raw_ref(refs
, update
->refname
, mustexist
,
2793 affected_refnames
, NULL
,
2795 &update
->type
, err
);
2799 reason
= strbuf_detach(err
, NULL
);
2800 strbuf_addf(err
, "cannot lock ref '%s': %s",
2801 original_update_refname(update
), reason
);
2806 update
->backend_data
= lock
;
2808 if (update
->type
& REF_ISSYMREF
) {
2809 if (update
->flags
& REF_NODEREF
) {
2811 * We won't be reading the referent as part of
2812 * the transaction, so we have to read it here
2813 * to record and possibly check old_sha1:
2815 if (refs_read_ref_full(&refs
->base
,
2817 lock
->old_oid
.hash
, NULL
)) {
2818 if (update
->flags
& REF_HAVE_OLD
) {
2819 strbuf_addf(err
, "cannot lock ref '%s': "
2820 "error reading reference",
2821 original_update_refname(update
));
2824 } else if (check_old_oid(update
, &lock
->old_oid
, err
)) {
2825 return TRANSACTION_GENERIC_ERROR
;
2829 * Create a new update for the reference this
2830 * symref is pointing at. Also, we will record
2831 * and verify old_sha1 for this update as part
2832 * of processing the split-off update, so we
2833 * don't have to do it here.
2835 ret
= split_symref_update(refs
, update
,
2836 referent
.buf
, transaction
,
2837 affected_refnames
, err
);
2842 struct ref_update
*parent_update
;
2844 if (check_old_oid(update
, &lock
->old_oid
, err
))
2845 return TRANSACTION_GENERIC_ERROR
;
2848 * If this update is happening indirectly because of a
2849 * symref update, record the old SHA-1 in the parent
2852 for (parent_update
= update
->parent_update
;
2854 parent_update
= parent_update
->parent_update
) {
2855 struct ref_lock
*parent_lock
= parent_update
->backend_data
;
2856 oidcpy(&parent_lock
->old_oid
, &lock
->old_oid
);
2860 if ((update
->flags
& REF_HAVE_NEW
) &&
2861 !(update
->flags
& REF_DELETING
) &&
2862 !(update
->flags
& REF_LOG_ONLY
)) {
2863 if (!(update
->type
& REF_ISSYMREF
) &&
2864 !hashcmp(lock
->old_oid
.hash
, update
->new_sha1
)) {
2866 * The reference already has the desired
2867 * value, so we don't need to write it.
2869 } else if (write_ref_to_lockfile(lock
, update
->new_sha1
,
2871 char *write_err
= strbuf_detach(err
, NULL
);
2874 * The lock was freed upon failure of
2875 * write_ref_to_lockfile():
2877 update
->backend_data
= NULL
;
2879 "cannot update ref '%s': %s",
2880 update
->refname
, write_err
);
2882 return TRANSACTION_GENERIC_ERROR
;
2884 update
->flags
|= REF_NEEDS_COMMIT
;
2887 if (!(update
->flags
& REF_NEEDS_COMMIT
)) {
2889 * We didn't call write_ref_to_lockfile(), so
2890 * the lockfile is still open. Close it to
2891 * free up the file descriptor:
2893 if (close_ref(lock
)) {
2894 strbuf_addf(err
, "couldn't close '%s.lock'",
2896 return TRANSACTION_GENERIC_ERROR
;
2902 static int files_transaction_commit(struct ref_store
*ref_store
,
2903 struct ref_transaction
*transaction
,
2906 struct files_ref_store
*refs
=
2907 files_downcast(ref_store
, REF_STORE_WRITE
,
2908 "ref_transaction_commit");
2910 struct string_list refs_to_delete
= STRING_LIST_INIT_NODUP
;
2911 struct string_list_item
*ref_to_delete
;
2912 struct string_list affected_refnames
= STRING_LIST_INIT_NODUP
;
2913 char *head_ref
= NULL
;
2915 struct object_id head_oid
;
2916 struct strbuf sb
= STRBUF_INIT
;
2920 if (transaction
->state
!= REF_TRANSACTION_OPEN
)
2921 die("BUG: commit called for transaction that is not open");
2923 if (!transaction
->nr
) {
2924 transaction
->state
= REF_TRANSACTION_CLOSED
;
2929 * Fail if a refname appears more than once in the
2930 * transaction. (If we end up splitting up any updates using
2931 * split_symref_update() or split_head_update(), those
2932 * functions will check that the new updates don't have the
2933 * same refname as any existing ones.)
2935 for (i
= 0; i
< transaction
->nr
; i
++) {
2936 struct ref_update
*update
= transaction
->updates
[i
];
2937 struct string_list_item
*item
=
2938 string_list_append(&affected_refnames
, update
->refname
);
2941 * We store a pointer to update in item->util, but at
2942 * the moment we never use the value of this field
2943 * except to check whether it is non-NULL.
2945 item
->util
= update
;
2947 string_list_sort(&affected_refnames
);
2948 if (ref_update_reject_duplicates(&affected_refnames
, err
)) {
2949 ret
= TRANSACTION_GENERIC_ERROR
;
2954 * Special hack: If a branch is updated directly and HEAD
2955 * points to it (may happen on the remote side of a push
2956 * for example) then logically the HEAD reflog should be
2959 * A generic solution would require reverse symref lookups,
2960 * but finding all symrefs pointing to a given branch would be
2961 * rather costly for this rare event (the direct update of a
2962 * branch) to be worth it. So let's cheat and check with HEAD
2963 * only, which should cover 99% of all usage scenarios (even
2964 * 100% of the default ones).
2966 * So if HEAD is a symbolic reference, then record the name of
2967 * the reference that it points to. If we see an update of
2968 * head_ref within the transaction, then split_head_update()
2969 * arranges for the reflog of HEAD to be updated, too.
2971 head_ref
= refs_resolve_refdup(ref_store
, "HEAD",
2972 RESOLVE_REF_NO_RECURSE
,
2973 head_oid
.hash
, &head_type
);
2975 if (head_ref
&& !(head_type
& REF_ISSYMREF
)) {
2981 * Acquire all locks, verify old values if provided, check
2982 * that new values are valid, and write new values to the
2983 * lockfiles, ready to be activated. Only keep one lockfile
2984 * open at a time to avoid running out of file descriptors.
2986 for (i
= 0; i
< transaction
->nr
; i
++) {
2987 struct ref_update
*update
= transaction
->updates
[i
];
2989 ret
= lock_ref_for_update(refs
, update
, transaction
,
2990 head_ref
, &affected_refnames
, err
);
2995 /* Perform updates first so live commits remain referenced */
2996 for (i
= 0; i
< transaction
->nr
; i
++) {
2997 struct ref_update
*update
= transaction
->updates
[i
];
2998 struct ref_lock
*lock
= update
->backend_data
;
3000 if (update
->flags
& REF_NEEDS_COMMIT
||
3001 update
->flags
& REF_LOG_ONLY
) {
3002 if (files_log_ref_write(refs
,
3006 update
->msg
, update
->flags
,
3008 char *old_msg
= strbuf_detach(err
, NULL
);
3010 strbuf_addf(err
, "cannot update the ref '%s': %s",
3011 lock
->ref_name
, old_msg
);
3014 update
->backend_data
= NULL
;
3015 ret
= TRANSACTION_GENERIC_ERROR
;
3019 if (update
->flags
& REF_NEEDS_COMMIT
) {
3020 clear_loose_ref_cache(refs
);
3021 if (commit_ref(lock
)) {
3022 strbuf_addf(err
, "couldn't set '%s'", lock
->ref_name
);
3024 update
->backend_data
= NULL
;
3025 ret
= TRANSACTION_GENERIC_ERROR
;
3030 /* Perform deletes now that updates are safely completed */
3031 for (i
= 0; i
< transaction
->nr
; i
++) {
3032 struct ref_update
*update
= transaction
->updates
[i
];
3033 struct ref_lock
*lock
= update
->backend_data
;
3035 if (update
->flags
& REF_DELETING
&&
3036 !(update
->flags
& REF_LOG_ONLY
)) {
3037 if (!(update
->type
& REF_ISPACKED
) ||
3038 update
->type
& REF_ISSYMREF
) {
3039 /* It is a loose reference. */
3041 files_ref_path(refs
, &sb
, lock
->ref_name
);
3042 if (unlink_or_msg(sb
.buf
, err
)) {
3043 ret
= TRANSACTION_GENERIC_ERROR
;
3046 update
->flags
|= REF_DELETED_LOOSE
;
3049 if (!(update
->flags
& REF_ISPRUNING
))
3050 string_list_append(&refs_to_delete
,
3055 if (repack_without_refs(refs
, &refs_to_delete
, err
)) {
3056 ret
= TRANSACTION_GENERIC_ERROR
;
3060 /* Delete the reflogs of any references that were deleted: */
3061 for_each_string_list_item(ref_to_delete
, &refs_to_delete
) {
3063 files_reflog_path(refs
, &sb
, ref_to_delete
->string
);
3064 if (!unlink_or_warn(sb
.buf
))
3065 try_remove_empty_parents(refs
, ref_to_delete
->string
,
3066 REMOVE_EMPTY_PARENTS_REFLOG
);
3069 clear_loose_ref_cache(refs
);
3072 strbuf_release(&sb
);
3073 transaction
->state
= REF_TRANSACTION_CLOSED
;
3075 for (i
= 0; i
< transaction
->nr
; i
++) {
3076 struct ref_update
*update
= transaction
->updates
[i
];
3077 struct ref_lock
*lock
= update
->backend_data
;
3082 if (update
->flags
& REF_DELETED_LOOSE
) {
3084 * The loose reference was deleted. Delete any
3085 * empty parent directories. (Note that this
3086 * can only work because we have already
3087 * removed the lockfile.)
3089 try_remove_empty_parents(refs
, update
->refname
,
3090 REMOVE_EMPTY_PARENTS_REF
);
3094 string_list_clear(&refs_to_delete
, 0);
3096 string_list_clear(&affected_refnames
, 0);
3101 static int ref_present(const char *refname
,
3102 const struct object_id
*oid
, int flags
, void *cb_data
)
3104 struct string_list
*affected_refnames
= cb_data
;
3106 return string_list_has_string(affected_refnames
, refname
);
3109 static int files_initial_transaction_commit(struct ref_store
*ref_store
,
3110 struct ref_transaction
*transaction
,
3113 struct files_ref_store
*refs
=
3114 files_downcast(ref_store
, REF_STORE_WRITE
,
3115 "initial_ref_transaction_commit");
3117 struct string_list affected_refnames
= STRING_LIST_INIT_NODUP
;
3121 if (transaction
->state
!= REF_TRANSACTION_OPEN
)
3122 die("BUG: commit called for transaction that is not open");
3124 /* Fail if a refname appears more than once in the transaction: */
3125 for (i
= 0; i
< transaction
->nr
; i
++)
3126 string_list_append(&affected_refnames
,
3127 transaction
->updates
[i
]->refname
);
3128 string_list_sort(&affected_refnames
);
3129 if (ref_update_reject_duplicates(&affected_refnames
, err
)) {
3130 ret
= TRANSACTION_GENERIC_ERROR
;
3135 * It's really undefined to call this function in an active
3136 * repository or when there are existing references: we are
3137 * only locking and changing packed-refs, so (1) any
3138 * simultaneous processes might try to change a reference at
3139 * the same time we do, and (2) any existing loose versions of
3140 * the references that we are setting would have precedence
3141 * over our values. But some remote helpers create the remote
3142 * "HEAD" and "master" branches before calling this function,
3143 * so here we really only check that none of the references
3144 * that we are creating already exists.
3146 if (refs_for_each_rawref(&refs
->base
, ref_present
,
3147 &affected_refnames
))
3148 die("BUG: initial ref transaction called with existing refs");
3150 for (i
= 0; i
< transaction
->nr
; i
++) {
3151 struct ref_update
*update
= transaction
->updates
[i
];
3153 if ((update
->flags
& REF_HAVE_OLD
) &&
3154 !is_null_sha1(update
->old_sha1
))
3155 die("BUG: initial ref transaction with old_sha1 set");
3156 if (refs_verify_refname_available(&refs
->base
, update
->refname
,
3157 &affected_refnames
, NULL
,
3159 ret
= TRANSACTION_NAME_CONFLICT
;
3164 if (lock_packed_refs(refs
, 0)) {
3165 strbuf_addf(err
, "unable to lock packed-refs file: %s",
3167 ret
= TRANSACTION_GENERIC_ERROR
;
3171 for (i
= 0; i
< transaction
->nr
; i
++) {
3172 struct ref_update
*update
= transaction
->updates
[i
];
3174 if ((update
->flags
& REF_HAVE_NEW
) &&
3175 !is_null_sha1(update
->new_sha1
))
3176 add_packed_ref(refs
, update
->refname
, update
->new_sha1
);
3179 if (commit_packed_refs(refs
)) {
3180 strbuf_addf(err
, "unable to commit packed-refs file: %s",
3182 ret
= TRANSACTION_GENERIC_ERROR
;
3187 transaction
->state
= REF_TRANSACTION_CLOSED
;
3188 string_list_clear(&affected_refnames
, 0);
3192 struct expire_reflog_cb
{
3194 reflog_expiry_should_prune_fn
*should_prune_fn
;
3197 struct object_id last_kept_oid
;
3200 static int expire_reflog_ent(struct object_id
*ooid
, struct object_id
*noid
,
3201 const char *email
, unsigned long timestamp
, int tz
,
3202 const char *message
, void *cb_data
)
3204 struct expire_reflog_cb
*cb
= cb_data
;
3205 struct expire_reflog_policy_cb
*policy_cb
= cb
->policy_cb
;
3207 if (cb
->flags
& EXPIRE_REFLOGS_REWRITE
)
3208 ooid
= &cb
->last_kept_oid
;
3210 if ((*cb
->should_prune_fn
)(ooid
, noid
, email
, timestamp
, tz
,
3211 message
, policy_cb
)) {
3213 printf("would prune %s", message
);
3214 else if (cb
->flags
& EXPIRE_REFLOGS_VERBOSE
)
3215 printf("prune %s", message
);
3218 fprintf(cb
->newlog
, "%s %s %s %lu %+05d\t%s",
3219 oid_to_hex(ooid
), oid_to_hex(noid
),
3220 email
, timestamp
, tz
, message
);
3221 oidcpy(&cb
->last_kept_oid
, noid
);
3223 if (cb
->flags
& EXPIRE_REFLOGS_VERBOSE
)
3224 printf("keep %s", message
);
3229 static int files_reflog_expire(struct ref_store
*ref_store
,
3230 const char *refname
, const unsigned char *sha1
,
3232 reflog_expiry_prepare_fn prepare_fn
,
3233 reflog_expiry_should_prune_fn should_prune_fn
,
3234 reflog_expiry_cleanup_fn cleanup_fn
,
3235 void *policy_cb_data
)
3237 struct files_ref_store
*refs
=
3238 files_downcast(ref_store
, REF_STORE_WRITE
, "reflog_expire");
3239 static struct lock_file reflog_lock
;
3240 struct expire_reflog_cb cb
;
3241 struct ref_lock
*lock
;
3242 struct strbuf log_file_sb
= STRBUF_INIT
;
3246 struct strbuf err
= STRBUF_INIT
;
3247 struct object_id oid
;
3249 memset(&cb
, 0, sizeof(cb
));
3251 cb
.policy_cb
= policy_cb_data
;
3252 cb
.should_prune_fn
= should_prune_fn
;
3255 * The reflog file is locked by holding the lock on the
3256 * reference itself, plus we might need to update the
3257 * reference if --updateref was specified:
3259 lock
= lock_ref_sha1_basic(refs
, refname
, sha1
,
3260 NULL
, NULL
, REF_NODEREF
,
3263 error("cannot lock ref '%s': %s", refname
, err
.buf
);
3264 strbuf_release(&err
);
3267 if (!refs_reflog_exists(ref_store
, refname
)) {
3272 files_reflog_path(refs
, &log_file_sb
, refname
);
3273 log_file
= strbuf_detach(&log_file_sb
, NULL
);
3274 if (!(flags
& EXPIRE_REFLOGS_DRY_RUN
)) {
3276 * Even though holding $GIT_DIR/logs/$reflog.lock has
3277 * no locking implications, we use the lock_file
3278 * machinery here anyway because it does a lot of the
3279 * work we need, including cleaning up if the program
3280 * exits unexpectedly.
3282 if (hold_lock_file_for_update(&reflog_lock
, log_file
, 0) < 0) {
3283 struct strbuf err
= STRBUF_INIT
;
3284 unable_to_lock_message(log_file
, errno
, &err
);
3285 error("%s", err
.buf
);
3286 strbuf_release(&err
);
3289 cb
.newlog
= fdopen_lock_file(&reflog_lock
, "w");
3291 error("cannot fdopen %s (%s)",
3292 get_lock_file_path(&reflog_lock
), strerror(errno
));
3297 hashcpy(oid
.hash
, sha1
);
3299 (*prepare_fn
)(refname
, &oid
, cb
.policy_cb
);
3300 refs_for_each_reflog_ent(ref_store
, refname
, expire_reflog_ent
, &cb
);
3301 (*cleanup_fn
)(cb
.policy_cb
);
3303 if (!(flags
& EXPIRE_REFLOGS_DRY_RUN
)) {
3305 * It doesn't make sense to adjust a reference pointed
3306 * to by a symbolic ref based on expiring entries in
3307 * the symbolic reference's reflog. Nor can we update
3308 * a reference if there are no remaining reflog
3311 int update
= (flags
& EXPIRE_REFLOGS_UPDATE_REF
) &&
3312 !(type
& REF_ISSYMREF
) &&
3313 !is_null_oid(&cb
.last_kept_oid
);
3315 if (close_lock_file(&reflog_lock
)) {
3316 status
|= error("couldn't write %s: %s", log_file
,
3318 } else if (update
&&
3319 (write_in_full(get_lock_file_fd(lock
->lk
),
3320 oid_to_hex(&cb
.last_kept_oid
), GIT_SHA1_HEXSZ
) != GIT_SHA1_HEXSZ
||
3321 write_str_in_full(get_lock_file_fd(lock
->lk
), "\n") != 1 ||
3322 close_ref(lock
) < 0)) {
3323 status
|= error("couldn't write %s",
3324 get_lock_file_path(lock
->lk
));
3325 rollback_lock_file(&reflog_lock
);
3326 } else if (commit_lock_file(&reflog_lock
)) {
3327 status
|= error("unable to write reflog '%s' (%s)",
3328 log_file
, strerror(errno
));
3329 } else if (update
&& commit_ref(lock
)) {
3330 status
|= error("couldn't set %s", lock
->ref_name
);
3338 rollback_lock_file(&reflog_lock
);
3344 static int files_init_db(struct ref_store
*ref_store
, struct strbuf
*err
)
3346 struct files_ref_store
*refs
=
3347 files_downcast(ref_store
, REF_STORE_WRITE
, "init_db");
3348 struct strbuf sb
= STRBUF_INIT
;
3351 * Create .git/refs/{heads,tags}
3353 files_ref_path(refs
, &sb
, "refs/heads");
3354 safe_create_dir(sb
.buf
, 1);
3357 files_ref_path(refs
, &sb
, "refs/tags");
3358 safe_create_dir(sb
.buf
, 1);
3360 strbuf_release(&sb
);
3364 struct ref_storage_be refs_be_files
= {
3367 files_ref_store_create
,
3369 files_transaction_commit
,
3370 files_initial_transaction_commit
,
3374 files_create_symref
,
3378 files_ref_iterator_begin
,
3381 files_reflog_iterator_begin
,
3382 files_for_each_reflog_ent
,
3383 files_for_each_reflog_ent_reverse
,
3384 files_reflog_exists
,
3385 files_create_reflog
,
3386 files_delete_reflog
,