4 #include "refs-internal.h"
6 #include "../iterator.h"
7 #include "../dir-iterator.h"
8 #include "../lockfile.h"
15 struct object_id old_oid
;
19 * Return true if refname, which has the specified oid and flags, can
20 * be resolved to an object in the database. If the referred-to object
21 * does not exist, emit a warning and return false.
23 static int ref_resolves_to_object(const char *refname
,
24 const struct object_id
*oid
,
27 if (flags
& REF_ISBROKEN
)
29 if (!has_sha1_file(oid
->hash
)) {
30 error("%s does not point to a valid object!", refname
);
36 struct packed_ref_cache
{
37 struct ref_cache
*cache
;
40 * Count of references to the data structure in this instance,
41 * including the pointer from files_ref_store::packed if any.
42 * The data will not be freed as long as the reference count
45 unsigned int referrers
;
47 /* The metadata from when this packed-refs cache was read */
48 struct stat_validity validity
;
52 * Future: need to be in "struct repository"
53 * when doing a full libification.
55 struct files_ref_store
{
56 struct ref_store base
;
57 unsigned int store_flags
;
61 char *packed_refs_path
;
63 struct ref_cache
*loose
;
64 struct packed_ref_cache
*packed
;
67 * Lock used for the "packed-refs" file. Note that this (and
68 * thus the enclosing `files_ref_store`) must not be freed.
70 struct lock_file packed_refs_lock
;
74 * Increment the reference count of *packed_refs.
76 static void acquire_packed_ref_cache(struct packed_ref_cache
*packed_refs
)
78 packed_refs
->referrers
++;
82 * Decrease the reference count of *packed_refs. If it goes to zero,
83 * free *packed_refs and return true; otherwise return false.
85 static int release_packed_ref_cache(struct packed_ref_cache
*packed_refs
)
87 if (!--packed_refs
->referrers
) {
88 free_ref_cache(packed_refs
->cache
);
89 stat_validity_clear(&packed_refs
->validity
);
97 static void clear_packed_ref_cache(struct files_ref_store
*refs
)
100 struct packed_ref_cache
*packed_refs
= refs
->packed
;
102 if (is_lock_file_locked(&refs
->packed_refs_lock
))
103 die("BUG: packed-ref cache cleared while locked");
105 release_packed_ref_cache(packed_refs
);
109 static void clear_loose_ref_cache(struct files_ref_store
*refs
)
112 free_ref_cache(refs
->loose
);
118 * Create a new submodule ref cache and add it to the internal
121 static struct ref_store
*files_ref_store_create(const char *gitdir
,
124 struct files_ref_store
*refs
= xcalloc(1, sizeof(*refs
));
125 struct ref_store
*ref_store
= (struct ref_store
*)refs
;
126 struct strbuf sb
= STRBUF_INIT
;
128 base_ref_store_init(ref_store
, &refs_be_files
);
129 refs
->store_flags
= flags
;
131 refs
->gitdir
= xstrdup(gitdir
);
132 get_common_dir_noenv(&sb
, gitdir
);
133 refs
->gitcommondir
= strbuf_detach(&sb
, NULL
);
134 strbuf_addf(&sb
, "%s/packed-refs", refs
->gitcommondir
);
135 refs
->packed_refs_path
= strbuf_detach(&sb
, NULL
);
141 * Die if refs is not the main ref store. caller is used in any
142 * necessary error messages.
144 static void files_assert_main_repository(struct files_ref_store
*refs
,
147 if (refs
->store_flags
& REF_STORE_MAIN
)
150 die("BUG: operation %s only allowed for main ref store", caller
);
154 * Downcast ref_store to files_ref_store. Die if ref_store is not a
155 * files_ref_store. required_flags is compared with ref_store's
156 * store_flags to ensure the ref_store has all required capabilities.
157 * "caller" is used in any necessary error messages.
159 static struct files_ref_store
*files_downcast(struct ref_store
*ref_store
,
160 unsigned int required_flags
,
163 struct files_ref_store
*refs
;
165 if (ref_store
->be
!= &refs_be_files
)
166 die("BUG: ref_store is type \"%s\" not \"files\" in %s",
167 ref_store
->be
->name
, caller
);
169 refs
= (struct files_ref_store
*)ref_store
;
171 if ((refs
->store_flags
& required_flags
) != required_flags
)
172 die("BUG: operation %s requires abilities 0x%x, but only have 0x%x",
173 caller
, required_flags
, refs
->store_flags
);
178 /* The length of a peeled reference line in packed-refs, including EOL: */
179 #define PEELED_LINE_LENGTH 42
182 * The packed-refs header line that we write out. Perhaps other
183 * traits will be added later. The trailing space is required.
185 static const char PACKED_REFS_HEADER
[] =
186 "# pack-refs with: peeled fully-peeled \n";
189 * Parse one line from a packed-refs file. Write the SHA1 to sha1.
190 * Return a pointer to the refname within the line (null-terminated),
191 * or NULL if there was a problem.
193 static const char *parse_ref_line(struct strbuf
*line
, struct object_id
*oid
)
197 if (parse_oid_hex(line
->buf
, oid
, &ref
) < 0)
199 if (!isspace(*ref
++))
205 if (line
->buf
[line
->len
- 1] != '\n')
207 line
->buf
[--line
->len
] = 0;
213 * Read from `packed_refs_file` into a newly-allocated
214 * `packed_ref_cache` and return it. The return value will already
215 * have its reference count incremented.
217 * A comment line of the form "# pack-refs with: " may contain zero or
218 * more traits. We interpret the traits as follows:
222 * Probably no references are peeled. But if the file contains a
223 * peeled value for a reference, we will use it.
227 * References under "refs/tags/", if they *can* be peeled, *are*
228 * peeled in this file. References outside of "refs/tags/" are
229 * probably not peeled even if they could have been, but if we find
230 * a peeled value for such a reference we will use it.
234 * All references in the file that can be peeled are peeled.
235 * Inversely (and this is more important), any references in the
236 * file for which no peeled value is recorded is not peelable. This
237 * trait should typically be written alongside "peeled" for
238 * compatibility with older clients, but we do not require it
239 * (i.e., "peeled" is a no-op if "fully-peeled" is set).
241 static struct packed_ref_cache
*read_packed_refs(const char *packed_refs_file
)
244 struct packed_ref_cache
*packed_refs
= xcalloc(1, sizeof(*packed_refs
));
245 struct ref_entry
*last
= NULL
;
246 struct strbuf line
= STRBUF_INIT
;
247 enum { PEELED_NONE
, PEELED_TAGS
, PEELED_FULLY
} peeled
= PEELED_NONE
;
250 acquire_packed_ref_cache(packed_refs
);
251 packed_refs
->cache
= create_ref_cache(NULL
, NULL
);
252 packed_refs
->cache
->root
->flag
&= ~REF_INCOMPLETE
;
254 f
= fopen(packed_refs_file
, "r");
256 if (errno
== ENOENT
) {
258 * This is OK; it just means that no
259 * "packed-refs" file has been written yet,
260 * which is equivalent to it being empty.
264 die_errno("couldn't read %s", packed_refs_file
);
268 stat_validity_update(&packed_refs
->validity
, fileno(f
));
270 dir
= get_ref_dir(packed_refs
->cache
->root
);
271 while (strbuf_getwholeline(&line
, f
, '\n') != EOF
) {
272 struct object_id oid
;
276 if (skip_prefix(line
.buf
, "# pack-refs with:", &traits
)) {
277 if (strstr(traits
, " fully-peeled "))
278 peeled
= PEELED_FULLY
;
279 else if (strstr(traits
, " peeled "))
280 peeled
= PEELED_TAGS
;
281 /* perhaps other traits later as well */
285 refname
= parse_ref_line(&line
, &oid
);
287 int flag
= REF_ISPACKED
;
289 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
)) {
290 if (!refname_is_safe(refname
))
291 die("packed refname is dangerous: %s", refname
);
293 flag
|= REF_BAD_NAME
| REF_ISBROKEN
;
295 last
= create_ref_entry(refname
, &oid
, flag
);
296 if (peeled
== PEELED_FULLY
||
297 (peeled
== PEELED_TAGS
&& starts_with(refname
, "refs/tags/")))
298 last
->flag
|= REF_KNOWS_PEELED
;
299 add_ref_entry(dir
, last
);
303 line
.buf
[0] == '^' &&
304 line
.len
== PEELED_LINE_LENGTH
&&
305 line
.buf
[PEELED_LINE_LENGTH
- 1] == '\n' &&
306 !get_oid_hex(line
.buf
+ 1, &oid
)) {
307 oidcpy(&last
->u
.value
.peeled
, &oid
);
309 * Regardless of what the file header said,
310 * we definitely know the value of *this*
313 last
->flag
|= REF_KNOWS_PEELED
;
318 strbuf_release(&line
);
323 static const char *files_packed_refs_path(struct files_ref_store
*refs
)
325 return refs
->packed_refs_path
;
328 static void files_reflog_path(struct files_ref_store
*refs
,
334 * FIXME: of course this is wrong in multi worktree
335 * setting. To be fixed real soon.
337 strbuf_addf(sb
, "%s/logs", refs
->gitcommondir
);
341 switch (ref_type(refname
)) {
342 case REF_TYPE_PER_WORKTREE
:
343 case REF_TYPE_PSEUDOREF
:
344 strbuf_addf(sb
, "%s/logs/%s", refs
->gitdir
, refname
);
346 case REF_TYPE_NORMAL
:
347 strbuf_addf(sb
, "%s/logs/%s", refs
->gitcommondir
, refname
);
350 die("BUG: unknown ref type %d of ref %s",
351 ref_type(refname
), refname
);
355 static void files_ref_path(struct files_ref_store
*refs
,
359 switch (ref_type(refname
)) {
360 case REF_TYPE_PER_WORKTREE
:
361 case REF_TYPE_PSEUDOREF
:
362 strbuf_addf(sb
, "%s/%s", refs
->gitdir
, refname
);
364 case REF_TYPE_NORMAL
:
365 strbuf_addf(sb
, "%s/%s", refs
->gitcommondir
, refname
);
368 die("BUG: unknown ref type %d of ref %s",
369 ref_type(refname
), refname
);
374 * Check that the packed refs cache (if any) still reflects the
375 * contents of the file. If not, clear the cache.
377 static void validate_packed_ref_cache(struct files_ref_store
*refs
)
380 !stat_validity_check(&refs
->packed
->validity
,
381 files_packed_refs_path(refs
)))
382 clear_packed_ref_cache(refs
);
386 * Get the packed_ref_cache for the specified files_ref_store,
387 * creating and populating it if it hasn't been read before or if the
388 * file has been changed (according to its `validity` field) since it
389 * was last read. On the other hand, if we hold the lock, then assume
390 * that the file hasn't been changed out from under us, so skip the
391 * extra `stat()` call in `stat_validity_check()`.
393 static struct packed_ref_cache
*get_packed_ref_cache(struct files_ref_store
*refs
)
395 const char *packed_refs_file
= files_packed_refs_path(refs
);
397 if (!is_lock_file_locked(&refs
->packed_refs_lock
))
398 validate_packed_ref_cache(refs
);
401 refs
->packed
= read_packed_refs(packed_refs_file
);
406 static struct ref_dir
*get_packed_ref_dir(struct packed_ref_cache
*packed_ref_cache
)
408 return get_ref_dir(packed_ref_cache
->cache
->root
);
411 static struct ref_dir
*get_packed_refs(struct files_ref_store
*refs
)
413 return get_packed_ref_dir(get_packed_ref_cache(refs
));
417 * Add a reference to the in-memory packed reference cache. This may
418 * only be called while the packed-refs file is locked (see
419 * lock_packed_refs()). To actually write the packed-refs file, call
420 * commit_packed_refs().
422 static void add_packed_ref(struct files_ref_store
*refs
,
423 const char *refname
, const struct object_id
*oid
)
425 struct packed_ref_cache
*packed_ref_cache
= get_packed_ref_cache(refs
);
427 if (!is_lock_file_locked(&refs
->packed_refs_lock
))
428 die("BUG: packed refs not locked");
430 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
431 die("Reference has invalid format: '%s'", refname
);
433 add_ref_entry(get_packed_ref_dir(packed_ref_cache
),
434 create_ref_entry(refname
, oid
, REF_ISPACKED
));
438 * Read the loose references from the namespace dirname into dir
439 * (without recursing). dirname must end with '/'. dir must be the
440 * directory entry corresponding to dirname.
442 static void loose_fill_ref_dir(struct ref_store
*ref_store
,
443 struct ref_dir
*dir
, const char *dirname
)
445 struct files_ref_store
*refs
=
446 files_downcast(ref_store
, REF_STORE_READ
, "fill_ref_dir");
449 int dirnamelen
= strlen(dirname
);
450 struct strbuf refname
;
451 struct strbuf path
= STRBUF_INIT
;
454 files_ref_path(refs
, &path
, dirname
);
455 path_baselen
= path
.len
;
457 d
= opendir(path
.buf
);
459 strbuf_release(&path
);
463 strbuf_init(&refname
, dirnamelen
+ 257);
464 strbuf_add(&refname
, dirname
, dirnamelen
);
466 while ((de
= readdir(d
)) != NULL
) {
467 struct object_id oid
;
471 if (de
->d_name
[0] == '.')
473 if (ends_with(de
->d_name
, ".lock"))
475 strbuf_addstr(&refname
, de
->d_name
);
476 strbuf_addstr(&path
, de
->d_name
);
477 if (stat(path
.buf
, &st
) < 0) {
478 ; /* silently ignore */
479 } else if (S_ISDIR(st
.st_mode
)) {
480 strbuf_addch(&refname
, '/');
481 add_entry_to_dir(dir
,
482 create_dir_entry(dir
->cache
, refname
.buf
,
485 if (!refs_resolve_ref_unsafe(&refs
->base
,
490 flag
|= REF_ISBROKEN
;
491 } else if (is_null_oid(&oid
)) {
493 * It is so astronomically unlikely
494 * that NULL_SHA1 is the SHA-1 of an
495 * actual object that we consider its
496 * appearance in a loose reference
497 * file to be repo corruption
498 * (probably due to a software bug).
500 flag
|= REF_ISBROKEN
;
503 if (check_refname_format(refname
.buf
,
504 REFNAME_ALLOW_ONELEVEL
)) {
505 if (!refname_is_safe(refname
.buf
))
506 die("loose refname is dangerous: %s", refname
.buf
);
508 flag
|= REF_BAD_NAME
| REF_ISBROKEN
;
510 add_entry_to_dir(dir
,
511 create_ref_entry(refname
.buf
, &oid
, flag
));
513 strbuf_setlen(&refname
, dirnamelen
);
514 strbuf_setlen(&path
, path_baselen
);
516 strbuf_release(&refname
);
517 strbuf_release(&path
);
521 * Manually add refs/bisect, which, being per-worktree, might
522 * not appear in the directory listing for refs/ in the main
525 if (!strcmp(dirname
, "refs/")) {
526 int pos
= search_ref_dir(dir
, "refs/bisect/", 12);
529 struct ref_entry
*child_entry
= create_dir_entry(
530 dir
->cache
, "refs/bisect/", 12, 1);
531 add_entry_to_dir(dir
, child_entry
);
536 static struct ref_cache
*get_loose_ref_cache(struct files_ref_store
*refs
)
540 * Mark the top-level directory complete because we
541 * are about to read the only subdirectory that can
544 refs
->loose
= create_ref_cache(&refs
->base
, loose_fill_ref_dir
);
546 /* We're going to fill the top level ourselves: */
547 refs
->loose
->root
->flag
&= ~REF_INCOMPLETE
;
550 * Add an incomplete entry for "refs/" (to be filled
553 add_entry_to_dir(get_ref_dir(refs
->loose
->root
),
554 create_dir_entry(refs
->loose
, "refs/", 5, 1));
560 * Return the ref_entry for the given refname from the packed
561 * references. If it does not exist, return NULL.
563 static struct ref_entry
*get_packed_ref(struct files_ref_store
*refs
,
566 return find_ref_entry(get_packed_refs(refs
), refname
);
570 * A loose ref file doesn't exist; check for a packed ref.
572 static int resolve_packed_ref(struct files_ref_store
*refs
,
574 unsigned char *sha1
, unsigned int *flags
)
576 struct ref_entry
*entry
;
579 * The loose reference file does not exist; check for a packed
582 entry
= get_packed_ref(refs
, refname
);
584 hashcpy(sha1
, entry
->u
.value
.oid
.hash
);
585 *flags
|= REF_ISPACKED
;
588 /* refname is not a packed reference. */
592 static int files_read_raw_ref(struct ref_store
*ref_store
,
593 const char *refname
, unsigned char *sha1
,
594 struct strbuf
*referent
, unsigned int *type
)
596 struct files_ref_store
*refs
=
597 files_downcast(ref_store
, REF_STORE_READ
, "read_raw_ref");
598 struct strbuf sb_contents
= STRBUF_INIT
;
599 struct strbuf sb_path
= STRBUF_INIT
;
606 int remaining_retries
= 3;
609 strbuf_reset(&sb_path
);
611 files_ref_path(refs
, &sb_path
, refname
);
617 * We might have to loop back here to avoid a race
618 * condition: first we lstat() the file, then we try
619 * to read it as a link or as a file. But if somebody
620 * changes the type of the file (file <-> directory
621 * <-> symlink) between the lstat() and reading, then
622 * we don't want to report that as an error but rather
623 * try again starting with the lstat().
625 * We'll keep a count of the retries, though, just to avoid
626 * any confusing situation sending us into an infinite loop.
629 if (remaining_retries
-- <= 0)
632 if (lstat(path
, &st
) < 0) {
635 if (resolve_packed_ref(refs
, refname
, sha1
, type
)) {
643 /* Follow "normalized" - ie "refs/.." symlinks by hand */
644 if (S_ISLNK(st
.st_mode
)) {
645 strbuf_reset(&sb_contents
);
646 if (strbuf_readlink(&sb_contents
, path
, 0) < 0) {
647 if (errno
== ENOENT
|| errno
== EINVAL
)
648 /* inconsistent with lstat; retry */
653 if (starts_with(sb_contents
.buf
, "refs/") &&
654 !check_refname_format(sb_contents
.buf
, 0)) {
655 strbuf_swap(&sb_contents
, referent
);
656 *type
|= REF_ISSYMREF
;
661 * It doesn't look like a refname; fall through to just
662 * treating it like a non-symlink, and reading whatever it
667 /* Is it a directory? */
668 if (S_ISDIR(st
.st_mode
)) {
670 * Even though there is a directory where the loose
671 * ref is supposed to be, there could still be a
674 if (resolve_packed_ref(refs
, refname
, sha1
, type
)) {
683 * Anything else, just open it and try to use it as
686 fd
= open(path
, O_RDONLY
);
688 if (errno
== ENOENT
&& !S_ISLNK(st
.st_mode
))
689 /* inconsistent with lstat; retry */
694 strbuf_reset(&sb_contents
);
695 if (strbuf_read(&sb_contents
, fd
, 256) < 0) {
696 int save_errno
= errno
;
702 strbuf_rtrim(&sb_contents
);
703 buf
= sb_contents
.buf
;
704 if (starts_with(buf
, "ref:")) {
706 while (isspace(*buf
))
709 strbuf_reset(referent
);
710 strbuf_addstr(referent
, buf
);
711 *type
|= REF_ISSYMREF
;
717 * Please note that FETCH_HEAD has additional
718 * data after the sha.
720 if (get_sha1_hex(buf
, sha1
) ||
721 (buf
[40] != '\0' && !isspace(buf
[40]))) {
722 *type
|= REF_ISBROKEN
;
731 strbuf_release(&sb_path
);
732 strbuf_release(&sb_contents
);
737 static void unlock_ref(struct ref_lock
*lock
)
739 /* Do not free lock->lk -- atexit() still looks at them */
741 rollback_lock_file(lock
->lk
);
742 free(lock
->ref_name
);
747 * Lock refname, without following symrefs, and set *lock_p to point
748 * at a newly-allocated lock object. Fill in lock->old_oid, referent,
749 * and type similarly to read_raw_ref().
751 * The caller must verify that refname is a "safe" reference name (in
752 * the sense of refname_is_safe()) before calling this function.
754 * If the reference doesn't already exist, verify that refname doesn't
755 * have a D/F conflict with any existing references. extras and skip
756 * are passed to refs_verify_refname_available() for this check.
758 * If mustexist is not set and the reference is not found or is
759 * broken, lock the reference anyway but clear sha1.
761 * Return 0 on success. On failure, write an error message to err and
762 * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR.
764 * Implementation note: This function is basically
769 * but it includes a lot more code to
770 * - Deal with possible races with other processes
771 * - Avoid calling refs_verify_refname_available() when it can be
772 * avoided, namely if we were successfully able to read the ref
773 * - Generate informative error messages in the case of failure
775 static int lock_raw_ref(struct files_ref_store
*refs
,
776 const char *refname
, int mustexist
,
777 const struct string_list
*extras
,
778 const struct string_list
*skip
,
779 struct ref_lock
**lock_p
,
780 struct strbuf
*referent
,
784 struct ref_lock
*lock
;
785 struct strbuf ref_file
= STRBUF_INIT
;
786 int attempts_remaining
= 3;
787 int ret
= TRANSACTION_GENERIC_ERROR
;
790 files_assert_main_repository(refs
, "lock_raw_ref");
794 /* First lock the file so it can't change out from under us. */
796 *lock_p
= lock
= xcalloc(1, sizeof(*lock
));
798 lock
->ref_name
= xstrdup(refname
);
799 files_ref_path(refs
, &ref_file
, refname
);
802 switch (safe_create_leading_directories(ref_file
.buf
)) {
807 * Suppose refname is "refs/foo/bar". We just failed
808 * to create the containing directory, "refs/foo",
809 * because there was a non-directory in the way. This
810 * indicates a D/F conflict, probably because of
811 * another reference such as "refs/foo". There is no
812 * reason to expect this error to be transitory.
814 if (refs_verify_refname_available(&refs
->base
, refname
,
815 extras
, skip
, err
)) {
818 * To the user the relevant error is
819 * that the "mustexist" reference is
823 strbuf_addf(err
, "unable to resolve reference '%s'",
827 * The error message set by
828 * refs_verify_refname_available() is
831 ret
= TRANSACTION_NAME_CONFLICT
;
835 * The file that is in the way isn't a loose
836 * reference. Report it as a low-level
839 strbuf_addf(err
, "unable to create lock file %s.lock; "
840 "non-directory in the way",
845 /* Maybe another process was tidying up. Try again. */
846 if (--attempts_remaining
> 0)
850 strbuf_addf(err
, "unable to create directory for %s",
856 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
858 if (hold_lock_file_for_update(lock
->lk
, ref_file
.buf
, LOCK_NO_DEREF
) < 0) {
859 if (errno
== ENOENT
&& --attempts_remaining
> 0) {
861 * Maybe somebody just deleted one of the
862 * directories leading to ref_file. Try
867 unable_to_lock_message(ref_file
.buf
, errno
, err
);
873 * Now we hold the lock and can read the reference without
874 * fear that its value will change.
877 if (files_read_raw_ref(&refs
->base
, refname
,
878 lock
->old_oid
.hash
, referent
, type
)) {
879 if (errno
== ENOENT
) {
881 /* Garden variety missing reference. */
882 strbuf_addf(err
, "unable to resolve reference '%s'",
887 * Reference is missing, but that's OK. We
888 * know that there is not a conflict with
889 * another loose reference because
890 * (supposing that we are trying to lock
891 * reference "refs/foo/bar"):
893 * - We were successfully able to create
894 * the lockfile refs/foo/bar.lock, so we
895 * know there cannot be a loose reference
898 * - We got ENOENT and not EISDIR, so we
899 * know that there cannot be a loose
900 * reference named "refs/foo/bar/baz".
903 } else if (errno
== EISDIR
) {
905 * There is a directory in the way. It might have
906 * contained references that have been deleted. If
907 * we don't require that the reference already
908 * exists, try to remove the directory so that it
909 * doesn't cause trouble when we want to rename the
910 * lockfile into place later.
913 /* Garden variety missing reference. */
914 strbuf_addf(err
, "unable to resolve reference '%s'",
917 } else if (remove_dir_recursively(&ref_file
,
918 REMOVE_DIR_EMPTY_ONLY
)) {
919 if (refs_verify_refname_available(
920 &refs
->base
, refname
,
921 extras
, skip
, err
)) {
923 * The error message set by
924 * verify_refname_available() is OK.
926 ret
= TRANSACTION_NAME_CONFLICT
;
930 * We can't delete the directory,
931 * but we also don't know of any
932 * references that it should
935 strbuf_addf(err
, "there is a non-empty directory '%s' "
936 "blocking reference '%s'",
937 ref_file
.buf
, refname
);
941 } else if (errno
== EINVAL
&& (*type
& REF_ISBROKEN
)) {
942 strbuf_addf(err
, "unable to resolve reference '%s': "
943 "reference broken", refname
);
946 strbuf_addf(err
, "unable to resolve reference '%s': %s",
947 refname
, strerror(errno
));
952 * If the ref did not exist and we are creating it,
953 * make sure there is no existing ref that conflicts
956 if (refs_verify_refname_available(
957 &refs
->base
, refname
,
970 strbuf_release(&ref_file
);
974 static int files_peel_ref(struct ref_store
*ref_store
,
975 const char *refname
, unsigned char *sha1
)
977 struct files_ref_store
*refs
=
978 files_downcast(ref_store
, REF_STORE_READ
| REF_STORE_ODB
,
981 unsigned char base
[20];
983 if (current_ref_iter
&& current_ref_iter
->refname
== refname
) {
984 struct object_id peeled
;
986 if (ref_iterator_peel(current_ref_iter
, &peeled
))
988 hashcpy(sha1
, peeled
.hash
);
992 if (refs_read_ref_full(ref_store
, refname
,
993 RESOLVE_REF_READING
, base
, &flag
))
997 * If the reference is packed, read its ref_entry from the
998 * cache in the hope that we already know its peeled value.
999 * We only try this optimization on packed references because
1000 * (a) forcing the filling of the loose reference cache could
1001 * be expensive and (b) loose references anyway usually do not
1002 * have REF_KNOWS_PEELED.
1004 if (flag
& REF_ISPACKED
) {
1005 struct ref_entry
*r
= get_packed_ref(refs
, refname
);
1007 if (peel_entry(r
, 0))
1009 hashcpy(sha1
, r
->u
.value
.peeled
.hash
);
1014 return peel_object(base
, sha1
);
1017 struct files_ref_iterator
{
1018 struct ref_iterator base
;
1020 struct packed_ref_cache
*packed_ref_cache
;
1021 struct ref_iterator
*iter0
;
1025 static int files_ref_iterator_advance(struct ref_iterator
*ref_iterator
)
1027 struct files_ref_iterator
*iter
=
1028 (struct files_ref_iterator
*)ref_iterator
;
1031 while ((ok
= ref_iterator_advance(iter
->iter0
)) == ITER_OK
) {
1032 if (iter
->flags
& DO_FOR_EACH_PER_WORKTREE_ONLY
&&
1033 ref_type(iter
->iter0
->refname
) != REF_TYPE_PER_WORKTREE
)
1036 if (!(iter
->flags
& DO_FOR_EACH_INCLUDE_BROKEN
) &&
1037 !ref_resolves_to_object(iter
->iter0
->refname
,
1039 iter
->iter0
->flags
))
1042 iter
->base
.refname
= iter
->iter0
->refname
;
1043 iter
->base
.oid
= iter
->iter0
->oid
;
1044 iter
->base
.flags
= iter
->iter0
->flags
;
1049 if (ref_iterator_abort(ref_iterator
) != ITER_DONE
)
1055 static int files_ref_iterator_peel(struct ref_iterator
*ref_iterator
,
1056 struct object_id
*peeled
)
1058 struct files_ref_iterator
*iter
=
1059 (struct files_ref_iterator
*)ref_iterator
;
1061 return ref_iterator_peel(iter
->iter0
, peeled
);
1064 static int files_ref_iterator_abort(struct ref_iterator
*ref_iterator
)
1066 struct files_ref_iterator
*iter
=
1067 (struct files_ref_iterator
*)ref_iterator
;
1071 ok
= ref_iterator_abort(iter
->iter0
);
1073 release_packed_ref_cache(iter
->packed_ref_cache
);
1074 base_ref_iterator_free(ref_iterator
);
1078 static struct ref_iterator_vtable files_ref_iterator_vtable
= {
1079 files_ref_iterator_advance
,
1080 files_ref_iterator_peel
,
1081 files_ref_iterator_abort
1084 static struct ref_iterator
*files_ref_iterator_begin(
1085 struct ref_store
*ref_store
,
1086 const char *prefix
, unsigned int flags
)
1088 struct files_ref_store
*refs
;
1089 struct ref_iterator
*loose_iter
, *packed_iter
;
1090 struct files_ref_iterator
*iter
;
1091 struct ref_iterator
*ref_iterator
;
1092 unsigned int required_flags
= REF_STORE_READ
;
1094 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
))
1095 required_flags
|= REF_STORE_ODB
;
1097 refs
= files_downcast(ref_store
, required_flags
, "ref_iterator_begin");
1099 iter
= xcalloc(1, sizeof(*iter
));
1100 ref_iterator
= &iter
->base
;
1101 base_ref_iterator_init(ref_iterator
, &files_ref_iterator_vtable
);
1104 * We must make sure that all loose refs are read before
1105 * accessing the packed-refs file; this avoids a race
1106 * condition if loose refs are migrated to the packed-refs
1107 * file by a simultaneous process, but our in-memory view is
1108 * from before the migration. We ensure this as follows:
1109 * First, we call start the loose refs iteration with its
1110 * `prime_ref` argument set to true. This causes the loose
1111 * references in the subtree to be pre-read into the cache.
1112 * (If they've already been read, that's OK; we only need to
1113 * guarantee that they're read before the packed refs, not
1114 * *how much* before.) After that, we call
1115 * get_packed_ref_cache(), which internally checks whether the
1116 * packed-ref cache is up to date with what is on disk, and
1117 * re-reads it if not.
1120 loose_iter
= cache_ref_iterator_begin(get_loose_ref_cache(refs
),
1123 iter
->packed_ref_cache
= get_packed_ref_cache(refs
);
1124 acquire_packed_ref_cache(iter
->packed_ref_cache
);
1125 packed_iter
= cache_ref_iterator_begin(iter
->packed_ref_cache
->cache
,
1128 iter
->iter0
= overlay_ref_iterator_begin(loose_iter
, packed_iter
);
1129 iter
->flags
= flags
;
1131 return ref_iterator
;
1135 * Verify that the reference locked by lock has the value old_sha1.
1136 * Fail if the reference doesn't exist and mustexist is set. Return 0
1137 * on success. On error, write an error message to err, set errno, and
1138 * return a negative value.
1140 static int verify_lock(struct ref_store
*ref_store
, struct ref_lock
*lock
,
1141 const unsigned char *old_sha1
, int mustexist
,
1146 if (refs_read_ref_full(ref_store
, lock
->ref_name
,
1147 mustexist
? RESOLVE_REF_READING
: 0,
1148 lock
->old_oid
.hash
, NULL
)) {
1150 int save_errno
= errno
;
1151 strbuf_addf(err
, "can't verify ref '%s'", lock
->ref_name
);
1155 oidclr(&lock
->old_oid
);
1159 if (old_sha1
&& hashcmp(lock
->old_oid
.hash
, old_sha1
)) {
1160 strbuf_addf(err
, "ref '%s' is at %s but expected %s",
1162 oid_to_hex(&lock
->old_oid
),
1163 sha1_to_hex(old_sha1
));
1170 static int remove_empty_directories(struct strbuf
*path
)
1173 * we want to create a file but there is a directory there;
1174 * if that is an empty directory (or a directory that contains
1175 * only empty directories), remove them.
1177 return remove_dir_recursively(path
, REMOVE_DIR_EMPTY_ONLY
);
1180 static int create_reflock(const char *path
, void *cb
)
1182 struct lock_file
*lk
= cb
;
1184 return hold_lock_file_for_update(lk
, path
, LOCK_NO_DEREF
) < 0 ? -1 : 0;
1188 * Locks a ref returning the lock on success and NULL on failure.
1189 * On failure errno is set to something meaningful.
1191 static struct ref_lock
*lock_ref_sha1_basic(struct files_ref_store
*refs
,
1192 const char *refname
,
1193 const unsigned char *old_sha1
,
1194 const struct string_list
*extras
,
1195 const struct string_list
*skip
,
1196 unsigned int flags
, int *type
,
1199 struct strbuf ref_file
= STRBUF_INIT
;
1200 struct ref_lock
*lock
;
1202 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1203 int resolve_flags
= RESOLVE_REF_NO_RECURSE
;
1206 files_assert_main_repository(refs
, "lock_ref_sha1_basic");
1209 lock
= xcalloc(1, sizeof(struct ref_lock
));
1212 resolve_flags
|= RESOLVE_REF_READING
;
1213 if (flags
& REF_DELETING
)
1214 resolve_flags
|= RESOLVE_REF_ALLOW_BAD_NAME
;
1216 files_ref_path(refs
, &ref_file
, refname
);
1217 resolved
= !!refs_resolve_ref_unsafe(&refs
->base
,
1218 refname
, resolve_flags
,
1219 lock
->old_oid
.hash
, type
);
1220 if (!resolved
&& errno
== EISDIR
) {
1222 * we are trying to lock foo but we used to
1223 * have foo/bar which now does not exist;
1224 * it is normal for the empty directory 'foo'
1227 if (remove_empty_directories(&ref_file
)) {
1229 if (!refs_verify_refname_available(
1231 refname
, extras
, skip
, err
))
1232 strbuf_addf(err
, "there are still refs under '%s'",
1236 resolved
= !!refs_resolve_ref_unsafe(&refs
->base
,
1237 refname
, resolve_flags
,
1238 lock
->old_oid
.hash
, type
);
1242 if (last_errno
!= ENOTDIR
||
1243 !refs_verify_refname_available(&refs
->base
, refname
,
1245 strbuf_addf(err
, "unable to resolve reference '%s': %s",
1246 refname
, strerror(last_errno
));
1252 * If the ref did not exist and we are creating it, make sure
1253 * there is no existing packed ref whose name begins with our
1254 * refname, nor a packed ref whose name is a proper prefix of
1257 if (is_null_oid(&lock
->old_oid
) &&
1258 refs_verify_refname_available(&refs
->base
, refname
,
1259 extras
, skip
, err
)) {
1260 last_errno
= ENOTDIR
;
1264 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1266 lock
->ref_name
= xstrdup(refname
);
1268 if (raceproof_create_file(ref_file
.buf
, create_reflock
, lock
->lk
)) {
1270 unable_to_lock_message(ref_file
.buf
, errno
, err
);
1274 if (verify_lock(&refs
->base
, lock
, old_sha1
, mustexist
, err
)) {
1285 strbuf_release(&ref_file
);
1291 * Write an entry to the packed-refs file for the specified refname.
1292 * If peeled is non-NULL, write it as the entry's peeled value.
1294 static void write_packed_entry(FILE *fh
, const char *refname
,
1295 const unsigned char *sha1
,
1296 const unsigned char *peeled
)
1298 fprintf_or_die(fh
, "%s %s\n", sha1_to_hex(sha1
), refname
);
1300 fprintf_or_die(fh
, "^%s\n", sha1_to_hex(peeled
));
1304 * Lock the packed-refs file for writing. Flags is passed to
1305 * hold_lock_file_for_update(). Return 0 on success. On errors, set
1306 * errno appropriately and return a nonzero value.
1308 static int lock_packed_refs(struct files_ref_store
*refs
, int flags
)
1310 static int timeout_configured
= 0;
1311 static int timeout_value
= 1000;
1312 struct packed_ref_cache
*packed_ref_cache
;
1314 files_assert_main_repository(refs
, "lock_packed_refs");
1316 if (!timeout_configured
) {
1317 git_config_get_int("core.packedrefstimeout", &timeout_value
);
1318 timeout_configured
= 1;
1321 if (hold_lock_file_for_update_timeout(
1322 &refs
->packed_refs_lock
, files_packed_refs_path(refs
),
1323 flags
, timeout_value
) < 0)
1327 * Now that we hold the `packed-refs` lock, make sure that our
1328 * cache matches the current version of the file. Normally
1329 * `get_packed_ref_cache()` does that for us, but that
1330 * function assumes that when the file is locked, any existing
1331 * cache is still valid. We've just locked the file, but it
1332 * might have changed the moment *before* we locked it.
1334 validate_packed_ref_cache(refs
);
1336 packed_ref_cache
= get_packed_ref_cache(refs
);
1337 /* Increment the reference count to prevent it from being freed: */
1338 acquire_packed_ref_cache(packed_ref_cache
);
1343 * Write the current version of the packed refs cache from memory to
1344 * disk. The packed-refs file must already be locked for writing (see
1345 * lock_packed_refs()). Return zero on success. On errors, set errno
1346 * and return a nonzero value
1348 static int commit_packed_refs(struct files_ref_store
*refs
)
1350 struct packed_ref_cache
*packed_ref_cache
=
1351 get_packed_ref_cache(refs
);
1355 struct ref_iterator
*iter
;
1357 files_assert_main_repository(refs
, "commit_packed_refs");
1359 if (!is_lock_file_locked(&refs
->packed_refs_lock
))
1360 die("BUG: packed-refs not locked");
1362 out
= fdopen_lock_file(&refs
->packed_refs_lock
, "w");
1364 die_errno("unable to fdopen packed-refs descriptor");
1366 fprintf_or_die(out
, "%s", PACKED_REFS_HEADER
);
1368 iter
= cache_ref_iterator_begin(packed_ref_cache
->cache
, NULL
, 0);
1369 while ((ok
= ref_iterator_advance(iter
)) == ITER_OK
) {
1370 struct object_id peeled
;
1371 int peel_error
= ref_iterator_peel(iter
, &peeled
);
1373 write_packed_entry(out
, iter
->refname
, iter
->oid
->hash
,
1374 peel_error
? NULL
: peeled
.hash
);
1377 if (ok
!= ITER_DONE
)
1378 die("error while iterating over references");
1380 if (commit_lock_file(&refs
->packed_refs_lock
)) {
1384 release_packed_ref_cache(packed_ref_cache
);
1390 * Rollback the lockfile for the packed-refs file, and discard the
1391 * in-memory packed reference cache. (The packed-refs file will be
1392 * read anew if it is needed again after this function is called.)
1394 static void rollback_packed_refs(struct files_ref_store
*refs
)
1396 struct packed_ref_cache
*packed_ref_cache
=
1397 get_packed_ref_cache(refs
);
1399 files_assert_main_repository(refs
, "rollback_packed_refs");
1401 if (!is_lock_file_locked(&refs
->packed_refs_lock
))
1402 die("BUG: packed-refs not locked");
1403 rollback_lock_file(&refs
->packed_refs_lock
);
1404 release_packed_ref_cache(packed_ref_cache
);
1405 clear_packed_ref_cache(refs
);
1408 struct ref_to_prune
{
1409 struct ref_to_prune
*next
;
1410 unsigned char sha1
[20];
1411 char name
[FLEX_ARRAY
];
1415 REMOVE_EMPTY_PARENTS_REF
= 0x01,
1416 REMOVE_EMPTY_PARENTS_REFLOG
= 0x02
1420 * Remove empty parent directories associated with the specified
1421 * reference and/or its reflog, but spare [logs/]refs/ and immediate
1422 * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or
1423 * REMOVE_EMPTY_PARENTS_REFLOG.
1425 static void try_remove_empty_parents(struct files_ref_store
*refs
,
1426 const char *refname
,
1429 struct strbuf buf
= STRBUF_INIT
;
1430 struct strbuf sb
= STRBUF_INIT
;
1434 strbuf_addstr(&buf
, refname
);
1436 for (i
= 0; i
< 2; i
++) { /* refs/{heads,tags,...}/ */
1437 while (*p
&& *p
!= '/')
1439 /* tolerate duplicate slashes; see check_refname_format() */
1443 q
= buf
.buf
+ buf
.len
;
1444 while (flags
& (REMOVE_EMPTY_PARENTS_REF
| REMOVE_EMPTY_PARENTS_REFLOG
)) {
1445 while (q
> p
&& *q
!= '/')
1447 while (q
> p
&& *(q
-1) == '/')
1451 strbuf_setlen(&buf
, q
- buf
.buf
);
1454 files_ref_path(refs
, &sb
, buf
.buf
);
1455 if ((flags
& REMOVE_EMPTY_PARENTS_REF
) && rmdir(sb
.buf
))
1456 flags
&= ~REMOVE_EMPTY_PARENTS_REF
;
1459 files_reflog_path(refs
, &sb
, buf
.buf
);
1460 if ((flags
& REMOVE_EMPTY_PARENTS_REFLOG
) && rmdir(sb
.buf
))
1461 flags
&= ~REMOVE_EMPTY_PARENTS_REFLOG
;
1463 strbuf_release(&buf
);
1464 strbuf_release(&sb
);
1467 /* make sure nobody touched the ref, and unlink */
1468 static void prune_ref(struct files_ref_store
*refs
, struct ref_to_prune
*r
)
1470 struct ref_transaction
*transaction
;
1471 struct strbuf err
= STRBUF_INIT
;
1473 if (check_refname_format(r
->name
, 0))
1476 transaction
= ref_store_transaction_begin(&refs
->base
, &err
);
1478 ref_transaction_delete(transaction
, r
->name
, r
->sha1
,
1479 REF_ISPRUNING
| REF_NODEREF
, NULL
, &err
) ||
1480 ref_transaction_commit(transaction
, &err
)) {
1481 ref_transaction_free(transaction
);
1482 error("%s", err
.buf
);
1483 strbuf_release(&err
);
1486 ref_transaction_free(transaction
);
1487 strbuf_release(&err
);
1490 static void prune_refs(struct files_ref_store
*refs
, struct ref_to_prune
*r
)
1499 * Return true if the specified reference should be packed.
1501 static int should_pack_ref(const char *refname
,
1502 const struct object_id
*oid
, unsigned int ref_flags
,
1503 unsigned int pack_flags
)
1505 /* Do not pack per-worktree refs: */
1506 if (ref_type(refname
) != REF_TYPE_NORMAL
)
1509 /* Do not pack non-tags unless PACK_REFS_ALL is set: */
1510 if (!(pack_flags
& PACK_REFS_ALL
) && !starts_with(refname
, "refs/tags/"))
1513 /* Do not pack symbolic refs: */
1514 if (ref_flags
& REF_ISSYMREF
)
1517 /* Do not pack broken refs: */
1518 if (!ref_resolves_to_object(refname
, oid
, ref_flags
))
1524 static int files_pack_refs(struct ref_store
*ref_store
, unsigned int flags
)
1526 struct files_ref_store
*refs
=
1527 files_downcast(ref_store
, REF_STORE_WRITE
| REF_STORE_ODB
,
1529 struct ref_iterator
*iter
;
1530 struct ref_dir
*packed_refs
;
1532 struct ref_to_prune
*refs_to_prune
= NULL
;
1534 lock_packed_refs(refs
, LOCK_DIE_ON_ERROR
);
1535 packed_refs
= get_packed_refs(refs
);
1537 iter
= cache_ref_iterator_begin(get_loose_ref_cache(refs
), NULL
, 0);
1538 while ((ok
= ref_iterator_advance(iter
)) == ITER_OK
) {
1540 * If the loose reference can be packed, add an entry
1541 * in the packed ref cache. If the reference should be
1542 * pruned, also add it to refs_to_prune.
1544 struct ref_entry
*packed_entry
;
1546 if (!should_pack_ref(iter
->refname
, iter
->oid
, iter
->flags
,
1551 * Create an entry in the packed-refs cache equivalent
1552 * to the one from the loose ref cache, except that
1553 * we don't copy the peeled status, because we want it
1556 packed_entry
= find_ref_entry(packed_refs
, iter
->refname
);
1558 /* Overwrite existing packed entry with info from loose entry */
1559 packed_entry
->flag
= REF_ISPACKED
;
1560 oidcpy(&packed_entry
->u
.value
.oid
, iter
->oid
);
1562 packed_entry
= create_ref_entry(iter
->refname
, iter
->oid
,
1564 add_ref_entry(packed_refs
, packed_entry
);
1566 oidclr(&packed_entry
->u
.value
.peeled
);
1568 /* Schedule the loose reference for pruning if requested. */
1569 if ((flags
& PACK_REFS_PRUNE
)) {
1570 struct ref_to_prune
*n
;
1571 FLEX_ALLOC_STR(n
, name
, iter
->refname
);
1572 hashcpy(n
->sha1
, iter
->oid
->hash
);
1573 n
->next
= refs_to_prune
;
1577 if (ok
!= ITER_DONE
)
1578 die("error while iterating over references");
1580 if (commit_packed_refs(refs
))
1581 die_errno("unable to overwrite old ref-pack file");
1583 prune_refs(refs
, refs_to_prune
);
1588 * Rewrite the packed-refs file, omitting any refs listed in
1589 * 'refnames'. On error, leave packed-refs unchanged, write an error
1590 * message to 'err', and return a nonzero value.
1592 * The refs in 'refnames' needn't be sorted. `err` must not be NULL.
1594 static int repack_without_refs(struct files_ref_store
*refs
,
1595 struct string_list
*refnames
, struct strbuf
*err
)
1597 struct ref_dir
*packed
;
1598 struct string_list_item
*refname
;
1599 int ret
, needs_repacking
= 0, removed
= 0;
1601 files_assert_main_repository(refs
, "repack_without_refs");
1604 /* Look for a packed ref */
1605 for_each_string_list_item(refname
, refnames
) {
1606 if (get_packed_ref(refs
, refname
->string
)) {
1607 needs_repacking
= 1;
1612 /* Avoid locking if we have nothing to do */
1613 if (!needs_repacking
)
1614 return 0; /* no refname exists in packed refs */
1616 if (lock_packed_refs(refs
, 0)) {
1617 unable_to_lock_message(files_packed_refs_path(refs
), errno
, err
);
1620 packed
= get_packed_refs(refs
);
1622 /* Remove refnames from the cache */
1623 for_each_string_list_item(refname
, refnames
)
1624 if (remove_entry_from_dir(packed
, refname
->string
) != -1)
1628 * All packed entries disappeared while we were
1629 * acquiring the lock.
1631 rollback_packed_refs(refs
);
1635 /* Write what remains */
1636 ret
= commit_packed_refs(refs
);
1638 strbuf_addf(err
, "unable to overwrite old ref-pack file: %s",
1643 static int files_delete_refs(struct ref_store
*ref_store
, const char *msg
,
1644 struct string_list
*refnames
, unsigned int flags
)
1646 struct files_ref_store
*refs
=
1647 files_downcast(ref_store
, REF_STORE_WRITE
, "delete_refs");
1648 struct strbuf err
= STRBUF_INIT
;
1654 result
= repack_without_refs(refs
, refnames
, &err
);
1657 * If we failed to rewrite the packed-refs file, then
1658 * it is unsafe to try to remove loose refs, because
1659 * doing so might expose an obsolete packed value for
1660 * a reference that might even point at an object that
1661 * has been garbage collected.
1663 if (refnames
->nr
== 1)
1664 error(_("could not delete reference %s: %s"),
1665 refnames
->items
[0].string
, err
.buf
);
1667 error(_("could not delete references: %s"), err
.buf
);
1672 for (i
= 0; i
< refnames
->nr
; i
++) {
1673 const char *refname
= refnames
->items
[i
].string
;
1675 if (refs_delete_ref(&refs
->base
, msg
, refname
, NULL
, flags
))
1676 result
|= error(_("could not remove reference %s"), refname
);
1680 strbuf_release(&err
);
1685 * People using contrib's git-new-workdir have .git/logs/refs ->
1686 * /some/other/path/.git/logs/refs, and that may live on another device.
1688 * IOW, to avoid cross device rename errors, the temporary renamed log must
1689 * live into logs/refs.
1691 #define TMP_RENAMED_LOG "refs/.tmp-renamed-log"
1694 const char *tmp_renamed_log
;
1698 static int rename_tmp_log_callback(const char *path
, void *cb_data
)
1700 struct rename_cb
*cb
= cb_data
;
1702 if (rename(cb
->tmp_renamed_log
, path
)) {
1704 * rename(a, b) when b is an existing directory ought
1705 * to result in ISDIR, but Solaris 5.8 gives ENOTDIR.
1706 * Sheesh. Record the true errno for error reporting,
1707 * but report EISDIR to raceproof_create_file() so
1708 * that it knows to retry.
1710 cb
->true_errno
= errno
;
1711 if (errno
== ENOTDIR
)
1719 static int rename_tmp_log(struct files_ref_store
*refs
, const char *newrefname
)
1721 struct strbuf path
= STRBUF_INIT
;
1722 struct strbuf tmp
= STRBUF_INIT
;
1723 struct rename_cb cb
;
1726 files_reflog_path(refs
, &path
, newrefname
);
1727 files_reflog_path(refs
, &tmp
, TMP_RENAMED_LOG
);
1728 cb
.tmp_renamed_log
= tmp
.buf
;
1729 ret
= raceproof_create_file(path
.buf
, rename_tmp_log_callback
, &cb
);
1731 if (errno
== EISDIR
)
1732 error("directory not empty: %s", path
.buf
);
1734 error("unable to move logfile %s to %s: %s",
1736 strerror(cb
.true_errno
));
1739 strbuf_release(&path
);
1740 strbuf_release(&tmp
);
1744 static int write_ref_to_lockfile(struct ref_lock
*lock
,
1745 const struct object_id
*oid
, struct strbuf
*err
);
1746 static int commit_ref_update(struct files_ref_store
*refs
,
1747 struct ref_lock
*lock
,
1748 const struct object_id
*oid
, const char *logmsg
,
1749 struct strbuf
*err
);
1751 static int files_rename_ref(struct ref_store
*ref_store
,
1752 const char *oldrefname
, const char *newrefname
,
1755 struct files_ref_store
*refs
=
1756 files_downcast(ref_store
, REF_STORE_WRITE
, "rename_ref");
1757 struct object_id oid
, orig_oid
;
1758 int flag
= 0, logmoved
= 0;
1759 struct ref_lock
*lock
;
1760 struct stat loginfo
;
1761 struct strbuf sb_oldref
= STRBUF_INIT
;
1762 struct strbuf sb_newref
= STRBUF_INIT
;
1763 struct strbuf tmp_renamed_log
= STRBUF_INIT
;
1765 struct strbuf err
= STRBUF_INIT
;
1767 files_reflog_path(refs
, &sb_oldref
, oldrefname
);
1768 files_reflog_path(refs
, &sb_newref
, newrefname
);
1769 files_reflog_path(refs
, &tmp_renamed_log
, TMP_RENAMED_LOG
);
1771 log
= !lstat(sb_oldref
.buf
, &loginfo
);
1772 if (log
&& S_ISLNK(loginfo
.st_mode
)) {
1773 ret
= error("reflog for %s is a symlink", oldrefname
);
1777 if (!refs_resolve_ref_unsafe(&refs
->base
, oldrefname
,
1778 RESOLVE_REF_READING
| RESOLVE_REF_NO_RECURSE
,
1779 orig_oid
.hash
, &flag
)) {
1780 ret
= error("refname %s not found", oldrefname
);
1784 if (flag
& REF_ISSYMREF
) {
1785 ret
= error("refname %s is a symbolic ref, renaming it is not supported",
1789 if (!refs_rename_ref_available(&refs
->base
, oldrefname
, newrefname
)) {
1794 if (log
&& rename(sb_oldref
.buf
, tmp_renamed_log
.buf
)) {
1795 ret
= error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG
": %s",
1796 oldrefname
, strerror(errno
));
1800 if (refs_delete_ref(&refs
->base
, logmsg
, oldrefname
,
1801 orig_oid
.hash
, REF_NODEREF
)) {
1802 error("unable to delete old %s", oldrefname
);
1807 * Since we are doing a shallow lookup, oid is not the
1808 * correct value to pass to delete_ref as old_oid. But that
1809 * doesn't matter, because an old_oid check wouldn't add to
1810 * the safety anyway; we want to delete the reference whatever
1811 * its current value.
1813 if (!refs_read_ref_full(&refs
->base
, newrefname
,
1814 RESOLVE_REF_READING
| RESOLVE_REF_NO_RECURSE
,
1816 refs_delete_ref(&refs
->base
, NULL
, newrefname
,
1817 NULL
, REF_NODEREF
)) {
1818 if (errno
== EISDIR
) {
1819 struct strbuf path
= STRBUF_INIT
;
1822 files_ref_path(refs
, &path
, newrefname
);
1823 result
= remove_empty_directories(&path
);
1824 strbuf_release(&path
);
1827 error("Directory not empty: %s", newrefname
);
1831 error("unable to delete existing %s", newrefname
);
1836 if (log
&& rename_tmp_log(refs
, newrefname
))
1841 lock
= lock_ref_sha1_basic(refs
, newrefname
, NULL
, NULL
, NULL
,
1842 REF_NODEREF
, NULL
, &err
);
1844 error("unable to rename '%s' to '%s': %s", oldrefname
, newrefname
, err
.buf
);
1845 strbuf_release(&err
);
1848 oidcpy(&lock
->old_oid
, &orig_oid
);
1850 if (write_ref_to_lockfile(lock
, &orig_oid
, &err
) ||
1851 commit_ref_update(refs
, lock
, &orig_oid
, logmsg
, &err
)) {
1852 error("unable to write current sha1 into %s: %s", newrefname
, err
.buf
);
1853 strbuf_release(&err
);
1861 lock
= lock_ref_sha1_basic(refs
, oldrefname
, NULL
, NULL
, NULL
,
1862 REF_NODEREF
, NULL
, &err
);
1864 error("unable to lock %s for rollback: %s", oldrefname
, err
.buf
);
1865 strbuf_release(&err
);
1869 flag
= log_all_ref_updates
;
1870 log_all_ref_updates
= LOG_REFS_NONE
;
1871 if (write_ref_to_lockfile(lock
, &orig_oid
, &err
) ||
1872 commit_ref_update(refs
, lock
, &orig_oid
, NULL
, &err
)) {
1873 error("unable to write current sha1 into %s: %s", oldrefname
, err
.buf
);
1874 strbuf_release(&err
);
1876 log_all_ref_updates
= flag
;
1879 if (logmoved
&& rename(sb_newref
.buf
, sb_oldref
.buf
))
1880 error("unable to restore logfile %s from %s: %s",
1881 oldrefname
, newrefname
, strerror(errno
));
1882 if (!logmoved
&& log
&&
1883 rename(tmp_renamed_log
.buf
, sb_oldref
.buf
))
1884 error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG
": %s",
1885 oldrefname
, strerror(errno
));
1888 strbuf_release(&sb_newref
);
1889 strbuf_release(&sb_oldref
);
1890 strbuf_release(&tmp_renamed_log
);
1895 static int close_ref(struct ref_lock
*lock
)
1897 if (close_lock_file(lock
->lk
))
1902 static int commit_ref(struct ref_lock
*lock
)
1904 char *path
= get_locked_file_path(lock
->lk
);
1907 if (!lstat(path
, &st
) && S_ISDIR(st
.st_mode
)) {
1909 * There is a directory at the path we want to rename
1910 * the lockfile to. Hopefully it is empty; try to
1913 size_t len
= strlen(path
);
1914 struct strbuf sb_path
= STRBUF_INIT
;
1916 strbuf_attach(&sb_path
, path
, len
, len
);
1919 * If this fails, commit_lock_file() will also fail
1920 * and will report the problem.
1922 remove_empty_directories(&sb_path
);
1923 strbuf_release(&sb_path
);
1928 if (commit_lock_file(lock
->lk
))
1933 static int open_or_create_logfile(const char *path
, void *cb
)
1937 *fd
= open(path
, O_APPEND
| O_WRONLY
| O_CREAT
, 0666);
1938 return (*fd
< 0) ? -1 : 0;
1942 * Create a reflog for a ref. If force_create = 0, only create the
1943 * reflog for certain refs (those for which should_autocreate_reflog
1944 * returns non-zero). Otherwise, create it regardless of the reference
1945 * name. If the logfile already existed or was created, return 0 and
1946 * set *logfd to the file descriptor opened for appending to the file.
1947 * If no logfile exists and we decided not to create one, return 0 and
1948 * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and
1951 static int log_ref_setup(struct files_ref_store
*refs
,
1952 const char *refname
, int force_create
,
1953 int *logfd
, struct strbuf
*err
)
1955 struct strbuf logfile_sb
= STRBUF_INIT
;
1958 files_reflog_path(refs
, &logfile_sb
, refname
);
1959 logfile
= strbuf_detach(&logfile_sb
, NULL
);
1961 if (force_create
|| should_autocreate_reflog(refname
)) {
1962 if (raceproof_create_file(logfile
, open_or_create_logfile
, logfd
)) {
1963 if (errno
== ENOENT
)
1964 strbuf_addf(err
, "unable to create directory for '%s': "
1965 "%s", logfile
, strerror(errno
));
1966 else if (errno
== EISDIR
)
1967 strbuf_addf(err
, "there are still logs under '%s'",
1970 strbuf_addf(err
, "unable to append to '%s': %s",
1971 logfile
, strerror(errno
));
1976 *logfd
= open(logfile
, O_APPEND
| O_WRONLY
, 0666);
1978 if (errno
== ENOENT
|| errno
== EISDIR
) {
1980 * The logfile doesn't already exist,
1981 * but that is not an error; it only
1982 * means that we won't write log
1987 strbuf_addf(err
, "unable to append to '%s': %s",
1988 logfile
, strerror(errno
));
1995 adjust_shared_perm(logfile
);
2005 static int files_create_reflog(struct ref_store
*ref_store
,
2006 const char *refname
, int force_create
,
2009 struct files_ref_store
*refs
=
2010 files_downcast(ref_store
, REF_STORE_WRITE
, "create_reflog");
2013 if (log_ref_setup(refs
, refname
, force_create
, &fd
, err
))
2022 static int log_ref_write_fd(int fd
, const struct object_id
*old_oid
,
2023 const struct object_id
*new_oid
,
2024 const char *committer
, const char *msg
)
2026 int msglen
, written
;
2027 unsigned maxlen
, len
;
2030 msglen
= msg
? strlen(msg
) : 0;
2031 maxlen
= strlen(committer
) + msglen
+ 100;
2032 logrec
= xmalloc(maxlen
);
2033 len
= xsnprintf(logrec
, maxlen
, "%s %s %s\n",
2034 oid_to_hex(old_oid
),
2035 oid_to_hex(new_oid
),
2038 len
+= copy_reflog_msg(logrec
+ len
- 1, msg
) - 1;
2040 written
= len
<= maxlen
? write_in_full(fd
, logrec
, len
) : -1;
2048 static int files_log_ref_write(struct files_ref_store
*refs
,
2049 const char *refname
, const struct object_id
*old_oid
,
2050 const struct object_id
*new_oid
, const char *msg
,
2051 int flags
, struct strbuf
*err
)
2055 if (log_all_ref_updates
== LOG_REFS_UNSET
)
2056 log_all_ref_updates
= is_bare_repository() ? LOG_REFS_NONE
: LOG_REFS_NORMAL
;
2058 result
= log_ref_setup(refs
, refname
,
2059 flags
& REF_FORCE_CREATE_REFLOG
,
2067 result
= log_ref_write_fd(logfd
, old_oid
, new_oid
,
2068 git_committer_info(0), msg
);
2070 struct strbuf sb
= STRBUF_INIT
;
2071 int save_errno
= errno
;
2073 files_reflog_path(refs
, &sb
, refname
);
2074 strbuf_addf(err
, "unable to append to '%s': %s",
2075 sb
.buf
, strerror(save_errno
));
2076 strbuf_release(&sb
);
2081 struct strbuf sb
= STRBUF_INIT
;
2082 int save_errno
= errno
;
2084 files_reflog_path(refs
, &sb
, refname
);
2085 strbuf_addf(err
, "unable to append to '%s': %s",
2086 sb
.buf
, strerror(save_errno
));
2087 strbuf_release(&sb
);
2094 * Write sha1 into the open lockfile, then close the lockfile. On
2095 * errors, rollback the lockfile, fill in *err and
2098 static int write_ref_to_lockfile(struct ref_lock
*lock
,
2099 const struct object_id
*oid
, struct strbuf
*err
)
2101 static char term
= '\n';
2105 o
= parse_object(oid
);
2108 "trying to write ref '%s' with nonexistent object %s",
2109 lock
->ref_name
, oid_to_hex(oid
));
2113 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
2115 "trying to write non-commit object %s to branch '%s'",
2116 oid_to_hex(oid
), lock
->ref_name
);
2120 fd
= get_lock_file_fd(lock
->lk
);
2121 if (write_in_full(fd
, oid_to_hex(oid
), GIT_SHA1_HEXSZ
) != GIT_SHA1_HEXSZ
||
2122 write_in_full(fd
, &term
, 1) != 1 ||
2123 close_ref(lock
) < 0) {
2125 "couldn't write '%s'", get_lock_file_path(lock
->lk
));
2133 * Commit a change to a loose reference that has already been written
2134 * to the loose reference lockfile. Also update the reflogs if
2135 * necessary, using the specified lockmsg (which can be NULL).
2137 static int commit_ref_update(struct files_ref_store
*refs
,
2138 struct ref_lock
*lock
,
2139 const struct object_id
*oid
, const char *logmsg
,
2142 files_assert_main_repository(refs
, "commit_ref_update");
2144 clear_loose_ref_cache(refs
);
2145 if (files_log_ref_write(refs
, lock
->ref_name
,
2146 &lock
->old_oid
, oid
,
2148 char *old_msg
= strbuf_detach(err
, NULL
);
2149 strbuf_addf(err
, "cannot update the ref '%s': %s",
2150 lock
->ref_name
, old_msg
);
2156 if (strcmp(lock
->ref_name
, "HEAD") != 0) {
2158 * Special hack: If a branch is updated directly and HEAD
2159 * points to it (may happen on the remote side of a push
2160 * for example) then logically the HEAD reflog should be
2162 * A generic solution implies reverse symref information,
2163 * but finding all symrefs pointing to the given branch
2164 * would be rather costly for this rare event (the direct
2165 * update of a branch) to be worth it. So let's cheat and
2166 * check with HEAD only which should cover 99% of all usage
2167 * scenarios (even 100% of the default ones).
2169 struct object_id head_oid
;
2171 const char *head_ref
;
2173 head_ref
= refs_resolve_ref_unsafe(&refs
->base
, "HEAD",
2174 RESOLVE_REF_READING
,
2175 head_oid
.hash
, &head_flag
);
2176 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
2177 !strcmp(head_ref
, lock
->ref_name
)) {
2178 struct strbuf log_err
= STRBUF_INIT
;
2179 if (files_log_ref_write(refs
, "HEAD",
2180 &lock
->old_oid
, oid
,
2181 logmsg
, 0, &log_err
)) {
2182 error("%s", log_err
.buf
);
2183 strbuf_release(&log_err
);
2188 if (commit_ref(lock
)) {
2189 strbuf_addf(err
, "couldn't set '%s'", lock
->ref_name
);
2198 static int create_ref_symlink(struct ref_lock
*lock
, const char *target
)
2201 #ifndef NO_SYMLINK_HEAD
2202 char *ref_path
= get_locked_file_path(lock
->lk
);
2204 ret
= symlink(target
, ref_path
);
2208 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
2213 static void update_symref_reflog(struct files_ref_store
*refs
,
2214 struct ref_lock
*lock
, const char *refname
,
2215 const char *target
, const char *logmsg
)
2217 struct strbuf err
= STRBUF_INIT
;
2218 struct object_id new_oid
;
2220 !refs_read_ref_full(&refs
->base
, target
,
2221 RESOLVE_REF_READING
, new_oid
.hash
, NULL
) &&
2222 files_log_ref_write(refs
, refname
, &lock
->old_oid
,
2223 &new_oid
, logmsg
, 0, &err
)) {
2224 error("%s", err
.buf
);
2225 strbuf_release(&err
);
2229 static int create_symref_locked(struct files_ref_store
*refs
,
2230 struct ref_lock
*lock
, const char *refname
,
2231 const char *target
, const char *logmsg
)
2233 if (prefer_symlink_refs
&& !create_ref_symlink(lock
, target
)) {
2234 update_symref_reflog(refs
, lock
, refname
, target
, logmsg
);
2238 if (!fdopen_lock_file(lock
->lk
, "w"))
2239 return error("unable to fdopen %s: %s",
2240 lock
->lk
->tempfile
.filename
.buf
, strerror(errno
));
2242 update_symref_reflog(refs
, lock
, refname
, target
, logmsg
);
2244 /* no error check; commit_ref will check ferror */
2245 fprintf(lock
->lk
->tempfile
.fp
, "ref: %s\n", target
);
2246 if (commit_ref(lock
) < 0)
2247 return error("unable to write symref for %s: %s", refname
,
2252 static int files_create_symref(struct ref_store
*ref_store
,
2253 const char *refname
, const char *target
,
2256 struct files_ref_store
*refs
=
2257 files_downcast(ref_store
, REF_STORE_WRITE
, "create_symref");
2258 struct strbuf err
= STRBUF_INIT
;
2259 struct ref_lock
*lock
;
2262 lock
= lock_ref_sha1_basic(refs
, refname
, NULL
,
2263 NULL
, NULL
, REF_NODEREF
, NULL
,
2266 error("%s", err
.buf
);
2267 strbuf_release(&err
);
2271 ret
= create_symref_locked(refs
, lock
, refname
, target
, logmsg
);
2276 static int files_reflog_exists(struct ref_store
*ref_store
,
2277 const char *refname
)
2279 struct files_ref_store
*refs
=
2280 files_downcast(ref_store
, REF_STORE_READ
, "reflog_exists");
2281 struct strbuf sb
= STRBUF_INIT
;
2285 files_reflog_path(refs
, &sb
, refname
);
2286 ret
= !lstat(sb
.buf
, &st
) && S_ISREG(st
.st_mode
);
2287 strbuf_release(&sb
);
2291 static int files_delete_reflog(struct ref_store
*ref_store
,
2292 const char *refname
)
2294 struct files_ref_store
*refs
=
2295 files_downcast(ref_store
, REF_STORE_WRITE
, "delete_reflog");
2296 struct strbuf sb
= STRBUF_INIT
;
2299 files_reflog_path(refs
, &sb
, refname
);
2300 ret
= remove_path(sb
.buf
);
2301 strbuf_release(&sb
);
2305 static int show_one_reflog_ent(struct strbuf
*sb
, each_reflog_ent_fn fn
, void *cb_data
)
2307 struct object_id ooid
, noid
;
2308 char *email_end
, *message
;
2309 timestamp_t timestamp
;
2311 const char *p
= sb
->buf
;
2313 /* old SP new SP name <email> SP time TAB msg LF */
2314 if (!sb
->len
|| sb
->buf
[sb
->len
- 1] != '\n' ||
2315 parse_oid_hex(p
, &ooid
, &p
) || *p
++ != ' ' ||
2316 parse_oid_hex(p
, &noid
, &p
) || *p
++ != ' ' ||
2317 !(email_end
= strchr(p
, '>')) ||
2318 email_end
[1] != ' ' ||
2319 !(timestamp
= parse_timestamp(email_end
+ 2, &message
, 10)) ||
2320 !message
|| message
[0] != ' ' ||
2321 (message
[1] != '+' && message
[1] != '-') ||
2322 !isdigit(message
[2]) || !isdigit(message
[3]) ||
2323 !isdigit(message
[4]) || !isdigit(message
[5]))
2324 return 0; /* corrupt? */
2325 email_end
[1] = '\0';
2326 tz
= strtol(message
+ 1, NULL
, 10);
2327 if (message
[6] != '\t')
2331 return fn(&ooid
, &noid
, p
, timestamp
, tz
, message
, cb_data
);
2334 static char *find_beginning_of_line(char *bob
, char *scan
)
2336 while (bob
< scan
&& *(--scan
) != '\n')
2337 ; /* keep scanning backwards */
2339 * Return either beginning of the buffer, or LF at the end of
2340 * the previous line.
2345 static int files_for_each_reflog_ent_reverse(struct ref_store
*ref_store
,
2346 const char *refname
,
2347 each_reflog_ent_fn fn
,
2350 struct files_ref_store
*refs
=
2351 files_downcast(ref_store
, REF_STORE_READ
,
2352 "for_each_reflog_ent_reverse");
2353 struct strbuf sb
= STRBUF_INIT
;
2356 int ret
= 0, at_tail
= 1;
2358 files_reflog_path(refs
, &sb
, refname
);
2359 logfp
= fopen(sb
.buf
, "r");
2360 strbuf_release(&sb
);
2364 /* Jump to the end */
2365 if (fseek(logfp
, 0, SEEK_END
) < 0)
2366 ret
= error("cannot seek back reflog for %s: %s",
2367 refname
, strerror(errno
));
2369 while (!ret
&& 0 < pos
) {
2375 /* Fill next block from the end */
2376 cnt
= (sizeof(buf
) < pos
) ? sizeof(buf
) : pos
;
2377 if (fseek(logfp
, pos
- cnt
, SEEK_SET
)) {
2378 ret
= error("cannot seek back reflog for %s: %s",
2379 refname
, strerror(errno
));
2382 nread
= fread(buf
, cnt
, 1, logfp
);
2384 ret
= error("cannot read %d bytes from reflog for %s: %s",
2385 cnt
, refname
, strerror(errno
));
2390 scanp
= endp
= buf
+ cnt
;
2391 if (at_tail
&& scanp
[-1] == '\n')
2392 /* Looking at the final LF at the end of the file */
2396 while (buf
< scanp
) {
2398 * terminating LF of the previous line, or the beginning
2403 bp
= find_beginning_of_line(buf
, scanp
);
2407 * The newline is the end of the previous line,
2408 * so we know we have complete line starting
2409 * at (bp + 1). Prefix it onto any prior data
2410 * we collected for the line and process it.
2412 strbuf_splice(&sb
, 0, 0, bp
+ 1, endp
- (bp
+ 1));
2415 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2421 * We are at the start of the buffer, and the
2422 * start of the file; there is no previous
2423 * line, and we have everything for this one.
2424 * Process it, and we can end the loop.
2426 strbuf_splice(&sb
, 0, 0, buf
, endp
- buf
);
2427 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2434 * We are at the start of the buffer, and there
2435 * is more file to read backwards. Which means
2436 * we are in the middle of a line. Note that we
2437 * may get here even if *bp was a newline; that
2438 * just means we are at the exact end of the
2439 * previous line, rather than some spot in the
2442 * Save away what we have to be combined with
2443 * the data from the next read.
2445 strbuf_splice(&sb
, 0, 0, buf
, endp
- buf
);
2452 die("BUG: reverse reflog parser had leftover data");
2455 strbuf_release(&sb
);
2459 static int files_for_each_reflog_ent(struct ref_store
*ref_store
,
2460 const char *refname
,
2461 each_reflog_ent_fn fn
, void *cb_data
)
2463 struct files_ref_store
*refs
=
2464 files_downcast(ref_store
, REF_STORE_READ
,
2465 "for_each_reflog_ent");
2467 struct strbuf sb
= STRBUF_INIT
;
2470 files_reflog_path(refs
, &sb
, refname
);
2471 logfp
= fopen(sb
.buf
, "r");
2472 strbuf_release(&sb
);
2476 while (!ret
&& !strbuf_getwholeline(&sb
, logfp
, '\n'))
2477 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2479 strbuf_release(&sb
);
2483 struct files_reflog_iterator
{
2484 struct ref_iterator base
;
2486 struct ref_store
*ref_store
;
2487 struct dir_iterator
*dir_iterator
;
2488 struct object_id oid
;
2491 static int files_reflog_iterator_advance(struct ref_iterator
*ref_iterator
)
2493 struct files_reflog_iterator
*iter
=
2494 (struct files_reflog_iterator
*)ref_iterator
;
2495 struct dir_iterator
*diter
= iter
->dir_iterator
;
2498 while ((ok
= dir_iterator_advance(diter
)) == ITER_OK
) {
2501 if (!S_ISREG(diter
->st
.st_mode
))
2503 if (diter
->basename
[0] == '.')
2505 if (ends_with(diter
->basename
, ".lock"))
2508 if (refs_read_ref_full(iter
->ref_store
,
2509 diter
->relative_path
, 0,
2510 iter
->oid
.hash
, &flags
)) {
2511 error("bad ref for %s", diter
->path
.buf
);
2515 iter
->base
.refname
= diter
->relative_path
;
2516 iter
->base
.oid
= &iter
->oid
;
2517 iter
->base
.flags
= flags
;
2521 iter
->dir_iterator
= NULL
;
2522 if (ref_iterator_abort(ref_iterator
) == ITER_ERROR
)
2527 static int files_reflog_iterator_peel(struct ref_iterator
*ref_iterator
,
2528 struct object_id
*peeled
)
2530 die("BUG: ref_iterator_peel() called for reflog_iterator");
2533 static int files_reflog_iterator_abort(struct ref_iterator
*ref_iterator
)
2535 struct files_reflog_iterator
*iter
=
2536 (struct files_reflog_iterator
*)ref_iterator
;
2539 if (iter
->dir_iterator
)
2540 ok
= dir_iterator_abort(iter
->dir_iterator
);
2542 base_ref_iterator_free(ref_iterator
);
2546 static struct ref_iterator_vtable files_reflog_iterator_vtable
= {
2547 files_reflog_iterator_advance
,
2548 files_reflog_iterator_peel
,
2549 files_reflog_iterator_abort
2552 static struct ref_iterator
*files_reflog_iterator_begin(struct ref_store
*ref_store
)
2554 struct files_ref_store
*refs
=
2555 files_downcast(ref_store
, REF_STORE_READ
,
2556 "reflog_iterator_begin");
2557 struct files_reflog_iterator
*iter
= xcalloc(1, sizeof(*iter
));
2558 struct ref_iterator
*ref_iterator
= &iter
->base
;
2559 struct strbuf sb
= STRBUF_INIT
;
2561 base_ref_iterator_init(ref_iterator
, &files_reflog_iterator_vtable
);
2562 files_reflog_path(refs
, &sb
, NULL
);
2563 iter
->dir_iterator
= dir_iterator_begin(sb
.buf
);
2564 iter
->ref_store
= ref_store
;
2565 strbuf_release(&sb
);
2566 return ref_iterator
;
2570 * If update is a direct update of head_ref (the reference pointed to
2571 * by HEAD), then add an extra REF_LOG_ONLY update for HEAD.
2573 static int split_head_update(struct ref_update
*update
,
2574 struct ref_transaction
*transaction
,
2575 const char *head_ref
,
2576 struct string_list
*affected_refnames
,
2579 struct string_list_item
*item
;
2580 struct ref_update
*new_update
;
2582 if ((update
->flags
& REF_LOG_ONLY
) ||
2583 (update
->flags
& REF_ISPRUNING
) ||
2584 (update
->flags
& REF_UPDATE_VIA_HEAD
))
2587 if (strcmp(update
->refname
, head_ref
))
2591 * First make sure that HEAD is not already in the
2592 * transaction. This insertion is O(N) in the transaction
2593 * size, but it happens at most once per transaction.
2595 item
= string_list_insert(affected_refnames
, "HEAD");
2597 /* An entry already existed */
2599 "multiple updates for 'HEAD' (including one "
2600 "via its referent '%s') are not allowed",
2602 return TRANSACTION_NAME_CONFLICT
;
2605 new_update
= ref_transaction_add_update(
2606 transaction
, "HEAD",
2607 update
->flags
| REF_LOG_ONLY
| REF_NODEREF
,
2608 update
->new_oid
.hash
, update
->old_oid
.hash
,
2611 item
->util
= new_update
;
2617 * update is for a symref that points at referent and doesn't have
2618 * REF_NODEREF set. Split it into two updates:
2619 * - The original update, but with REF_LOG_ONLY and REF_NODEREF set
2620 * - A new, separate update for the referent reference
2621 * Note that the new update will itself be subject to splitting when
2622 * the iteration gets to it.
2624 static int split_symref_update(struct files_ref_store
*refs
,
2625 struct ref_update
*update
,
2626 const char *referent
,
2627 struct ref_transaction
*transaction
,
2628 struct string_list
*affected_refnames
,
2631 struct string_list_item
*item
;
2632 struct ref_update
*new_update
;
2633 unsigned int new_flags
;
2636 * First make sure that referent is not already in the
2637 * transaction. This insertion is O(N) in the transaction
2638 * size, but it happens at most once per symref in a
2641 item
= string_list_insert(affected_refnames
, referent
);
2643 /* An entry already existed */
2645 "multiple updates for '%s' (including one "
2646 "via symref '%s') are not allowed",
2647 referent
, update
->refname
);
2648 return TRANSACTION_NAME_CONFLICT
;
2651 new_flags
= update
->flags
;
2652 if (!strcmp(update
->refname
, "HEAD")) {
2654 * Record that the new update came via HEAD, so that
2655 * when we process it, split_head_update() doesn't try
2656 * to add another reflog update for HEAD. Note that
2657 * this bit will be propagated if the new_update
2658 * itself needs to be split.
2660 new_flags
|= REF_UPDATE_VIA_HEAD
;
2663 new_update
= ref_transaction_add_update(
2664 transaction
, referent
, new_flags
,
2665 update
->new_oid
.hash
, update
->old_oid
.hash
,
2668 new_update
->parent_update
= update
;
2671 * Change the symbolic ref update to log only. Also, it
2672 * doesn't need to check its old SHA-1 value, as that will be
2673 * done when new_update is processed.
2675 update
->flags
|= REF_LOG_ONLY
| REF_NODEREF
;
2676 update
->flags
&= ~REF_HAVE_OLD
;
2678 item
->util
= new_update
;
2684 * Return the refname under which update was originally requested.
2686 static const char *original_update_refname(struct ref_update
*update
)
2688 while (update
->parent_update
)
2689 update
= update
->parent_update
;
2691 return update
->refname
;
2695 * Check whether the REF_HAVE_OLD and old_oid values stored in update
2696 * are consistent with oid, which is the reference's current value. If
2697 * everything is OK, return 0; otherwise, write an error message to
2698 * err and return -1.
2700 static int check_old_oid(struct ref_update
*update
, struct object_id
*oid
,
2703 if (!(update
->flags
& REF_HAVE_OLD
) ||
2704 !oidcmp(oid
, &update
->old_oid
))
2707 if (is_null_oid(&update
->old_oid
))
2708 strbuf_addf(err
, "cannot lock ref '%s': "
2709 "reference already exists",
2710 original_update_refname(update
));
2711 else if (is_null_oid(oid
))
2712 strbuf_addf(err
, "cannot lock ref '%s': "
2713 "reference is missing but expected %s",
2714 original_update_refname(update
),
2715 oid_to_hex(&update
->old_oid
));
2717 strbuf_addf(err
, "cannot lock ref '%s': "
2718 "is at %s but expected %s",
2719 original_update_refname(update
),
2721 oid_to_hex(&update
->old_oid
));
2727 * Prepare for carrying out update:
2728 * - Lock the reference referred to by update.
2729 * - Read the reference under lock.
2730 * - Check that its old SHA-1 value (if specified) is correct, and in
2731 * any case record it in update->lock->old_oid for later use when
2732 * writing the reflog.
2733 * - If it is a symref update without REF_NODEREF, split it up into a
2734 * REF_LOG_ONLY update of the symref and add a separate update for
2735 * the referent to transaction.
2736 * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY
2739 static int lock_ref_for_update(struct files_ref_store
*refs
,
2740 struct ref_update
*update
,
2741 struct ref_transaction
*transaction
,
2742 const char *head_ref
,
2743 struct string_list
*affected_refnames
,
2746 struct strbuf referent
= STRBUF_INIT
;
2747 int mustexist
= (update
->flags
& REF_HAVE_OLD
) &&
2748 !is_null_oid(&update
->old_oid
);
2750 struct ref_lock
*lock
;
2752 files_assert_main_repository(refs
, "lock_ref_for_update");
2754 if ((update
->flags
& REF_HAVE_NEW
) && is_null_oid(&update
->new_oid
))
2755 update
->flags
|= REF_DELETING
;
2758 ret
= split_head_update(update
, transaction
, head_ref
,
2759 affected_refnames
, err
);
2764 ret
= lock_raw_ref(refs
, update
->refname
, mustexist
,
2765 affected_refnames
, NULL
,
2767 &update
->type
, err
);
2771 reason
= strbuf_detach(err
, NULL
);
2772 strbuf_addf(err
, "cannot lock ref '%s': %s",
2773 original_update_refname(update
), reason
);
2778 update
->backend_data
= lock
;
2780 if (update
->type
& REF_ISSYMREF
) {
2781 if (update
->flags
& REF_NODEREF
) {
2783 * We won't be reading the referent as part of
2784 * the transaction, so we have to read it here
2785 * to record and possibly check old_sha1:
2787 if (refs_read_ref_full(&refs
->base
,
2789 lock
->old_oid
.hash
, NULL
)) {
2790 if (update
->flags
& REF_HAVE_OLD
) {
2791 strbuf_addf(err
, "cannot lock ref '%s': "
2792 "error reading reference",
2793 original_update_refname(update
));
2796 } else if (check_old_oid(update
, &lock
->old_oid
, err
)) {
2797 return TRANSACTION_GENERIC_ERROR
;
2801 * Create a new update for the reference this
2802 * symref is pointing at. Also, we will record
2803 * and verify old_sha1 for this update as part
2804 * of processing the split-off update, so we
2805 * don't have to do it here.
2807 ret
= split_symref_update(refs
, update
,
2808 referent
.buf
, transaction
,
2809 affected_refnames
, err
);
2814 struct ref_update
*parent_update
;
2816 if (check_old_oid(update
, &lock
->old_oid
, err
))
2817 return TRANSACTION_GENERIC_ERROR
;
2820 * If this update is happening indirectly because of a
2821 * symref update, record the old SHA-1 in the parent
2824 for (parent_update
= update
->parent_update
;
2826 parent_update
= parent_update
->parent_update
) {
2827 struct ref_lock
*parent_lock
= parent_update
->backend_data
;
2828 oidcpy(&parent_lock
->old_oid
, &lock
->old_oid
);
2832 if ((update
->flags
& REF_HAVE_NEW
) &&
2833 !(update
->flags
& REF_DELETING
) &&
2834 !(update
->flags
& REF_LOG_ONLY
)) {
2835 if (!(update
->type
& REF_ISSYMREF
) &&
2836 !oidcmp(&lock
->old_oid
, &update
->new_oid
)) {
2838 * The reference already has the desired
2839 * value, so we don't need to write it.
2841 } else if (write_ref_to_lockfile(lock
, &update
->new_oid
,
2843 char *write_err
= strbuf_detach(err
, NULL
);
2846 * The lock was freed upon failure of
2847 * write_ref_to_lockfile():
2849 update
->backend_data
= NULL
;
2851 "cannot update ref '%s': %s",
2852 update
->refname
, write_err
);
2854 return TRANSACTION_GENERIC_ERROR
;
2856 update
->flags
|= REF_NEEDS_COMMIT
;
2859 if (!(update
->flags
& REF_NEEDS_COMMIT
)) {
2861 * We didn't call write_ref_to_lockfile(), so
2862 * the lockfile is still open. Close it to
2863 * free up the file descriptor:
2865 if (close_ref(lock
)) {
2866 strbuf_addf(err
, "couldn't close '%s.lock'",
2868 return TRANSACTION_GENERIC_ERROR
;
2875 * Unlock any references in `transaction` that are still locked, and
2876 * mark the transaction closed.
2878 static void files_transaction_cleanup(struct ref_transaction
*transaction
)
2882 for (i
= 0; i
< transaction
->nr
; i
++) {
2883 struct ref_update
*update
= transaction
->updates
[i
];
2884 struct ref_lock
*lock
= update
->backend_data
;
2888 update
->backend_data
= NULL
;
2892 transaction
->state
= REF_TRANSACTION_CLOSED
;
2895 static int files_transaction_prepare(struct ref_store
*ref_store
,
2896 struct ref_transaction
*transaction
,
2899 struct files_ref_store
*refs
=
2900 files_downcast(ref_store
, REF_STORE_WRITE
,
2901 "ref_transaction_prepare");
2904 struct string_list affected_refnames
= STRING_LIST_INIT_NODUP
;
2905 char *head_ref
= NULL
;
2907 struct object_id head_oid
;
2911 if (!transaction
->nr
)
2915 * Fail if a refname appears more than once in the
2916 * transaction. (If we end up splitting up any updates using
2917 * split_symref_update() or split_head_update(), those
2918 * functions will check that the new updates don't have the
2919 * same refname as any existing ones.)
2921 for (i
= 0; i
< transaction
->nr
; i
++) {
2922 struct ref_update
*update
= transaction
->updates
[i
];
2923 struct string_list_item
*item
=
2924 string_list_append(&affected_refnames
, update
->refname
);
2927 * We store a pointer to update in item->util, but at
2928 * the moment we never use the value of this field
2929 * except to check whether it is non-NULL.
2931 item
->util
= update
;
2933 string_list_sort(&affected_refnames
);
2934 if (ref_update_reject_duplicates(&affected_refnames
, err
)) {
2935 ret
= TRANSACTION_GENERIC_ERROR
;
2940 * Special hack: If a branch is updated directly and HEAD
2941 * points to it (may happen on the remote side of a push
2942 * for example) then logically the HEAD reflog should be
2945 * A generic solution would require reverse symref lookups,
2946 * but finding all symrefs pointing to a given branch would be
2947 * rather costly for this rare event (the direct update of a
2948 * branch) to be worth it. So let's cheat and check with HEAD
2949 * only, which should cover 99% of all usage scenarios (even
2950 * 100% of the default ones).
2952 * So if HEAD is a symbolic reference, then record the name of
2953 * the reference that it points to. If we see an update of
2954 * head_ref within the transaction, then split_head_update()
2955 * arranges for the reflog of HEAD to be updated, too.
2957 head_ref
= refs_resolve_refdup(ref_store
, "HEAD",
2958 RESOLVE_REF_NO_RECURSE
,
2959 head_oid
.hash
, &head_type
);
2961 if (head_ref
&& !(head_type
& REF_ISSYMREF
)) {
2962 FREE_AND_NULL(head_ref
);
2966 * Acquire all locks, verify old values if provided, check
2967 * that new values are valid, and write new values to the
2968 * lockfiles, ready to be activated. Only keep one lockfile
2969 * open at a time to avoid running out of file descriptors.
2970 * Note that lock_ref_for_update() might append more updates
2971 * to the transaction.
2973 for (i
= 0; i
< transaction
->nr
; i
++) {
2974 struct ref_update
*update
= transaction
->updates
[i
];
2976 ret
= lock_ref_for_update(refs
, update
, transaction
,
2977 head_ref
, &affected_refnames
, err
);
2984 string_list_clear(&affected_refnames
, 0);
2987 files_transaction_cleanup(transaction
);
2989 transaction
->state
= REF_TRANSACTION_PREPARED
;
2994 static int files_transaction_finish(struct ref_store
*ref_store
,
2995 struct ref_transaction
*transaction
,
2998 struct files_ref_store
*refs
=
2999 files_downcast(ref_store
, 0, "ref_transaction_finish");
3002 struct string_list refs_to_delete
= STRING_LIST_INIT_NODUP
;
3003 struct string_list_item
*ref_to_delete
;
3004 struct strbuf sb
= STRBUF_INIT
;
3008 if (!transaction
->nr
) {
3009 transaction
->state
= REF_TRANSACTION_CLOSED
;
3013 /* Perform updates first so live commits remain referenced */
3014 for (i
= 0; i
< transaction
->nr
; i
++) {
3015 struct ref_update
*update
= transaction
->updates
[i
];
3016 struct ref_lock
*lock
= update
->backend_data
;
3018 if (update
->flags
& REF_NEEDS_COMMIT
||
3019 update
->flags
& REF_LOG_ONLY
) {
3020 if (files_log_ref_write(refs
,
3024 update
->msg
, update
->flags
,
3026 char *old_msg
= strbuf_detach(err
, NULL
);
3028 strbuf_addf(err
, "cannot update the ref '%s': %s",
3029 lock
->ref_name
, old_msg
);
3032 update
->backend_data
= NULL
;
3033 ret
= TRANSACTION_GENERIC_ERROR
;
3037 if (update
->flags
& REF_NEEDS_COMMIT
) {
3038 clear_loose_ref_cache(refs
);
3039 if (commit_ref(lock
)) {
3040 strbuf_addf(err
, "couldn't set '%s'", lock
->ref_name
);
3042 update
->backend_data
= NULL
;
3043 ret
= TRANSACTION_GENERIC_ERROR
;
3048 /* Perform deletes now that updates are safely completed */
3049 for (i
= 0; i
< transaction
->nr
; i
++) {
3050 struct ref_update
*update
= transaction
->updates
[i
];
3051 struct ref_lock
*lock
= update
->backend_data
;
3053 if (update
->flags
& REF_DELETING
&&
3054 !(update
->flags
& REF_LOG_ONLY
)) {
3055 if (!(update
->type
& REF_ISPACKED
) ||
3056 update
->type
& REF_ISSYMREF
) {
3057 /* It is a loose reference. */
3059 files_ref_path(refs
, &sb
, lock
->ref_name
);
3060 if (unlink_or_msg(sb
.buf
, err
)) {
3061 ret
= TRANSACTION_GENERIC_ERROR
;
3064 update
->flags
|= REF_DELETED_LOOSE
;
3067 if (!(update
->flags
& REF_ISPRUNING
))
3068 string_list_append(&refs_to_delete
,
3073 if (repack_without_refs(refs
, &refs_to_delete
, err
)) {
3074 ret
= TRANSACTION_GENERIC_ERROR
;
3078 /* Delete the reflogs of any references that were deleted: */
3079 for_each_string_list_item(ref_to_delete
, &refs_to_delete
) {
3081 files_reflog_path(refs
, &sb
, ref_to_delete
->string
);
3082 if (!unlink_or_warn(sb
.buf
))
3083 try_remove_empty_parents(refs
, ref_to_delete
->string
,
3084 REMOVE_EMPTY_PARENTS_REFLOG
);
3087 clear_loose_ref_cache(refs
);
3090 files_transaction_cleanup(transaction
);
3092 for (i
= 0; i
< transaction
->nr
; i
++) {
3093 struct ref_update
*update
= transaction
->updates
[i
];
3095 if (update
->flags
& REF_DELETED_LOOSE
) {
3097 * The loose reference was deleted. Delete any
3098 * empty parent directories. (Note that this
3099 * can only work because we have already
3100 * removed the lockfile.)
3102 try_remove_empty_parents(refs
, update
->refname
,
3103 REMOVE_EMPTY_PARENTS_REF
);
3107 strbuf_release(&sb
);
3108 string_list_clear(&refs_to_delete
, 0);
3112 static int files_transaction_abort(struct ref_store
*ref_store
,
3113 struct ref_transaction
*transaction
,
3116 files_transaction_cleanup(transaction
);
3120 static int ref_present(const char *refname
,
3121 const struct object_id
*oid
, int flags
, void *cb_data
)
3123 struct string_list
*affected_refnames
= cb_data
;
3125 return string_list_has_string(affected_refnames
, refname
);
3128 static int files_initial_transaction_commit(struct ref_store
*ref_store
,
3129 struct ref_transaction
*transaction
,
3132 struct files_ref_store
*refs
=
3133 files_downcast(ref_store
, REF_STORE_WRITE
,
3134 "initial_ref_transaction_commit");
3137 struct string_list affected_refnames
= STRING_LIST_INIT_NODUP
;
3141 if (transaction
->state
!= REF_TRANSACTION_OPEN
)
3142 die("BUG: commit called for transaction that is not open");
3144 /* Fail if a refname appears more than once in the transaction: */
3145 for (i
= 0; i
< transaction
->nr
; i
++)
3146 string_list_append(&affected_refnames
,
3147 transaction
->updates
[i
]->refname
);
3148 string_list_sort(&affected_refnames
);
3149 if (ref_update_reject_duplicates(&affected_refnames
, err
)) {
3150 ret
= TRANSACTION_GENERIC_ERROR
;
3155 * It's really undefined to call this function in an active
3156 * repository or when there are existing references: we are
3157 * only locking and changing packed-refs, so (1) any
3158 * simultaneous processes might try to change a reference at
3159 * the same time we do, and (2) any existing loose versions of
3160 * the references that we are setting would have precedence
3161 * over our values. But some remote helpers create the remote
3162 * "HEAD" and "master" branches before calling this function,
3163 * so here we really only check that none of the references
3164 * that we are creating already exists.
3166 if (refs_for_each_rawref(&refs
->base
, ref_present
,
3167 &affected_refnames
))
3168 die("BUG: initial ref transaction called with existing refs");
3170 for (i
= 0; i
< transaction
->nr
; i
++) {
3171 struct ref_update
*update
= transaction
->updates
[i
];
3173 if ((update
->flags
& REF_HAVE_OLD
) &&
3174 !is_null_oid(&update
->old_oid
))
3175 die("BUG: initial ref transaction with old_sha1 set");
3176 if (refs_verify_refname_available(&refs
->base
, update
->refname
,
3177 &affected_refnames
, NULL
,
3179 ret
= TRANSACTION_NAME_CONFLICT
;
3184 if (lock_packed_refs(refs
, 0)) {
3185 strbuf_addf(err
, "unable to lock packed-refs file: %s",
3187 ret
= TRANSACTION_GENERIC_ERROR
;
3191 for (i
= 0; i
< transaction
->nr
; i
++) {
3192 struct ref_update
*update
= transaction
->updates
[i
];
3194 if ((update
->flags
& REF_HAVE_NEW
) &&
3195 !is_null_oid(&update
->new_oid
))
3196 add_packed_ref(refs
, update
->refname
,
3200 if (commit_packed_refs(refs
)) {
3201 strbuf_addf(err
, "unable to commit packed-refs file: %s",
3203 ret
= TRANSACTION_GENERIC_ERROR
;
3208 transaction
->state
= REF_TRANSACTION_CLOSED
;
3209 string_list_clear(&affected_refnames
, 0);
3213 struct expire_reflog_cb
{
3215 reflog_expiry_should_prune_fn
*should_prune_fn
;
3218 struct object_id last_kept_oid
;
3221 static int expire_reflog_ent(struct object_id
*ooid
, struct object_id
*noid
,
3222 const char *email
, timestamp_t timestamp
, int tz
,
3223 const char *message
, void *cb_data
)
3225 struct expire_reflog_cb
*cb
= cb_data
;
3226 struct expire_reflog_policy_cb
*policy_cb
= cb
->policy_cb
;
3228 if (cb
->flags
& EXPIRE_REFLOGS_REWRITE
)
3229 ooid
= &cb
->last_kept_oid
;
3231 if ((*cb
->should_prune_fn
)(ooid
, noid
, email
, timestamp
, tz
,
3232 message
, policy_cb
)) {
3234 printf("would prune %s", message
);
3235 else if (cb
->flags
& EXPIRE_REFLOGS_VERBOSE
)
3236 printf("prune %s", message
);
3239 fprintf(cb
->newlog
, "%s %s %s %"PRItime
" %+05d\t%s",
3240 oid_to_hex(ooid
), oid_to_hex(noid
),
3241 email
, timestamp
, tz
, message
);
3242 oidcpy(&cb
->last_kept_oid
, noid
);
3244 if (cb
->flags
& EXPIRE_REFLOGS_VERBOSE
)
3245 printf("keep %s", message
);
3250 static int files_reflog_expire(struct ref_store
*ref_store
,
3251 const char *refname
, const unsigned char *sha1
,
3253 reflog_expiry_prepare_fn prepare_fn
,
3254 reflog_expiry_should_prune_fn should_prune_fn
,
3255 reflog_expiry_cleanup_fn cleanup_fn
,
3256 void *policy_cb_data
)
3258 struct files_ref_store
*refs
=
3259 files_downcast(ref_store
, REF_STORE_WRITE
, "reflog_expire");
3260 static struct lock_file reflog_lock
;
3261 struct expire_reflog_cb cb
;
3262 struct ref_lock
*lock
;
3263 struct strbuf log_file_sb
= STRBUF_INIT
;
3267 struct strbuf err
= STRBUF_INIT
;
3268 struct object_id oid
;
3270 memset(&cb
, 0, sizeof(cb
));
3272 cb
.policy_cb
= policy_cb_data
;
3273 cb
.should_prune_fn
= should_prune_fn
;
3276 * The reflog file is locked by holding the lock on the
3277 * reference itself, plus we might need to update the
3278 * reference if --updateref was specified:
3280 lock
= lock_ref_sha1_basic(refs
, refname
, sha1
,
3281 NULL
, NULL
, REF_NODEREF
,
3284 error("cannot lock ref '%s': %s", refname
, err
.buf
);
3285 strbuf_release(&err
);
3288 if (!refs_reflog_exists(ref_store
, refname
)) {
3293 files_reflog_path(refs
, &log_file_sb
, refname
);
3294 log_file
= strbuf_detach(&log_file_sb
, NULL
);
3295 if (!(flags
& EXPIRE_REFLOGS_DRY_RUN
)) {
3297 * Even though holding $GIT_DIR/logs/$reflog.lock has
3298 * no locking implications, we use the lock_file
3299 * machinery here anyway because it does a lot of the
3300 * work we need, including cleaning up if the program
3301 * exits unexpectedly.
3303 if (hold_lock_file_for_update(&reflog_lock
, log_file
, 0) < 0) {
3304 struct strbuf err
= STRBUF_INIT
;
3305 unable_to_lock_message(log_file
, errno
, &err
);
3306 error("%s", err
.buf
);
3307 strbuf_release(&err
);
3310 cb
.newlog
= fdopen_lock_file(&reflog_lock
, "w");
3312 error("cannot fdopen %s (%s)",
3313 get_lock_file_path(&reflog_lock
), strerror(errno
));
3318 hashcpy(oid
.hash
, sha1
);
3320 (*prepare_fn
)(refname
, &oid
, cb
.policy_cb
);
3321 refs_for_each_reflog_ent(ref_store
, refname
, expire_reflog_ent
, &cb
);
3322 (*cleanup_fn
)(cb
.policy_cb
);
3324 if (!(flags
& EXPIRE_REFLOGS_DRY_RUN
)) {
3326 * It doesn't make sense to adjust a reference pointed
3327 * to by a symbolic ref based on expiring entries in
3328 * the symbolic reference's reflog. Nor can we update
3329 * a reference if there are no remaining reflog
3332 int update
= (flags
& EXPIRE_REFLOGS_UPDATE_REF
) &&
3333 !(type
& REF_ISSYMREF
) &&
3334 !is_null_oid(&cb
.last_kept_oid
);
3336 if (close_lock_file(&reflog_lock
)) {
3337 status
|= error("couldn't write %s: %s", log_file
,
3339 } else if (update
&&
3340 (write_in_full(get_lock_file_fd(lock
->lk
),
3341 oid_to_hex(&cb
.last_kept_oid
), GIT_SHA1_HEXSZ
) != GIT_SHA1_HEXSZ
||
3342 write_str_in_full(get_lock_file_fd(lock
->lk
), "\n") != 1 ||
3343 close_ref(lock
) < 0)) {
3344 status
|= error("couldn't write %s",
3345 get_lock_file_path(lock
->lk
));
3346 rollback_lock_file(&reflog_lock
);
3347 } else if (commit_lock_file(&reflog_lock
)) {
3348 status
|= error("unable to write reflog '%s' (%s)",
3349 log_file
, strerror(errno
));
3350 } else if (update
&& commit_ref(lock
)) {
3351 status
|= error("couldn't set %s", lock
->ref_name
);
3359 rollback_lock_file(&reflog_lock
);
3365 static int files_init_db(struct ref_store
*ref_store
, struct strbuf
*err
)
3367 struct files_ref_store
*refs
=
3368 files_downcast(ref_store
, REF_STORE_WRITE
, "init_db");
3369 struct strbuf sb
= STRBUF_INIT
;
3372 * Create .git/refs/{heads,tags}
3374 files_ref_path(refs
, &sb
, "refs/heads");
3375 safe_create_dir(sb
.buf
, 1);
3378 files_ref_path(refs
, &sb
, "refs/tags");
3379 safe_create_dir(sb
.buf
, 1);
3381 strbuf_release(&sb
);
3385 struct ref_storage_be refs_be_files
= {
3388 files_ref_store_create
,
3390 files_transaction_prepare
,
3391 files_transaction_finish
,
3392 files_transaction_abort
,
3393 files_initial_transaction_commit
,
3397 files_create_symref
,
3401 files_ref_iterator_begin
,
3404 files_reflog_iterator_begin
,
3405 files_for_each_reflog_ent
,
3406 files_for_each_reflog_ent_reverse
,
3407 files_reflog_exists
,
3408 files_create_reflog
,
3409 files_delete_reflog
,