3 #include "refs-internal.h"
5 #include "../iterator.h"
6 #include "../dir-iterator.h"
7 #include "../lockfile.h"
14 struct object_id old_oid
;
18 * Return true if refname, which has the specified oid and flags, can
19 * be resolved to an object in the database. If the referred-to object
20 * does not exist, emit a warning and return false.
22 static int ref_resolves_to_object(const char *refname
,
23 const struct object_id
*oid
,
26 if (flags
& REF_ISBROKEN
)
28 if (!has_sha1_file(oid
->hash
)) {
29 error("%s does not point to a valid object!", refname
);
35 struct packed_ref_cache
{
36 struct ref_cache
*cache
;
39 * Count of references to the data structure in this instance,
40 * including the pointer from files_ref_store::packed if any.
41 * The data will not be freed as long as the reference count
44 unsigned int referrers
;
46 /* The metadata from when this packed-refs cache was read */
47 struct stat_validity validity
;
51 * A container for `packed-refs`-related data. It is not (yet) a
54 struct packed_ref_store
{
55 unsigned int store_flags
;
57 /* The path of the "packed-refs" file: */
61 * A cache of the values read from the `packed-refs` file, if
62 * it might still be current; otherwise, NULL.
64 struct packed_ref_cache
*cache
;
67 * Lock used for the "packed-refs" file. Note that this (and
68 * thus the enclosing `packed_ref_store`) must not be freed.
70 struct lock_file lock
;
73 static struct packed_ref_store
*packed_ref_store_create(
74 const char *path
, unsigned int store_flags
)
76 struct packed_ref_store
*refs
= xcalloc(1, sizeof(*refs
));
78 refs
->store_flags
= store_flags
;
79 refs
->path
= xstrdup(path
);
84 * Die if refs is not the main ref store. caller is used in any
85 * necessary error messages.
87 static void packed_assert_main_repository(struct packed_ref_store
*refs
,
90 if (refs
->store_flags
& REF_STORE_MAIN
)
93 die("BUG: operation %s only allowed for main ref store", caller
);
97 * Future: need to be in "struct repository"
98 * when doing a full libification.
100 struct files_ref_store
{
101 struct ref_store base
;
102 unsigned int store_flags
;
107 struct ref_cache
*loose
;
109 struct packed_ref_store
*packed_ref_store
;
113 * Increment the reference count of *packed_refs.
115 static void acquire_packed_ref_cache(struct packed_ref_cache
*packed_refs
)
117 packed_refs
->referrers
++;
121 * Decrease the reference count of *packed_refs. If it goes to zero,
122 * free *packed_refs and return true; otherwise return false.
124 static int release_packed_ref_cache(struct packed_ref_cache
*packed_refs
)
126 if (!--packed_refs
->referrers
) {
127 free_ref_cache(packed_refs
->cache
);
128 stat_validity_clear(&packed_refs
->validity
);
136 static void clear_packed_ref_cache(struct packed_ref_store
*refs
)
139 struct packed_ref_cache
*cache
= refs
->cache
;
141 if (is_lock_file_locked(&refs
->lock
))
142 die("BUG: packed-ref cache cleared while locked");
144 release_packed_ref_cache(cache
);
148 static void clear_loose_ref_cache(struct files_ref_store
*refs
)
151 free_ref_cache(refs
->loose
);
157 * Create a new submodule ref cache and add it to the internal
160 static struct ref_store
*files_ref_store_create(const char *gitdir
,
163 struct files_ref_store
*refs
= xcalloc(1, sizeof(*refs
));
164 struct ref_store
*ref_store
= (struct ref_store
*)refs
;
165 struct strbuf sb
= STRBUF_INIT
;
167 base_ref_store_init(ref_store
, &refs_be_files
);
168 refs
->store_flags
= flags
;
170 refs
->gitdir
= xstrdup(gitdir
);
171 get_common_dir_noenv(&sb
, gitdir
);
172 refs
->gitcommondir
= strbuf_detach(&sb
, NULL
);
173 strbuf_addf(&sb
, "%s/packed-refs", refs
->gitcommondir
);
174 refs
->packed_ref_store
= packed_ref_store_create(sb
.buf
, flags
);
181 * Die if refs is not the main ref store. caller is used in any
182 * necessary error messages.
184 static void files_assert_main_repository(struct files_ref_store
*refs
,
187 if (refs
->store_flags
& REF_STORE_MAIN
)
190 die("BUG: operation %s only allowed for main ref store", caller
);
194 * Downcast ref_store to files_ref_store. Die if ref_store is not a
195 * files_ref_store. required_flags is compared with ref_store's
196 * store_flags to ensure the ref_store has all required capabilities.
197 * "caller" is used in any necessary error messages.
199 static struct files_ref_store
*files_downcast(struct ref_store
*ref_store
,
200 unsigned int required_flags
,
203 struct files_ref_store
*refs
;
205 if (ref_store
->be
!= &refs_be_files
)
206 die("BUG: ref_store is type \"%s\" not \"files\" in %s",
207 ref_store
->be
->name
, caller
);
209 refs
= (struct files_ref_store
*)ref_store
;
211 if ((refs
->store_flags
& required_flags
) != required_flags
)
212 die("BUG: operation %s requires abilities 0x%x, but only have 0x%x",
213 caller
, required_flags
, refs
->store_flags
);
218 /* The length of a peeled reference line in packed-refs, including EOL: */
219 #define PEELED_LINE_LENGTH 42
222 * The packed-refs header line that we write out. Perhaps other
223 * traits will be added later. The trailing space is required.
225 static const char PACKED_REFS_HEADER
[] =
226 "# pack-refs with: peeled fully-peeled \n";
229 * Parse one line from a packed-refs file. Write the SHA1 to sha1.
230 * Return a pointer to the refname within the line (null-terminated),
231 * or NULL if there was a problem.
233 static const char *parse_ref_line(struct strbuf
*line
, struct object_id
*oid
)
237 if (parse_oid_hex(line
->buf
, oid
, &ref
) < 0)
239 if (!isspace(*ref
++))
245 if (line
->buf
[line
->len
- 1] != '\n')
247 line
->buf
[--line
->len
] = 0;
253 * Read from `packed_refs_file` into a newly-allocated
254 * `packed_ref_cache` and return it. The return value will already
255 * have its reference count incremented.
257 * A comment line of the form "# pack-refs with: " may contain zero or
258 * more traits. We interpret the traits as follows:
262 * Probably no references are peeled. But if the file contains a
263 * peeled value for a reference, we will use it.
267 * References under "refs/tags/", if they *can* be peeled, *are*
268 * peeled in this file. References outside of "refs/tags/" are
269 * probably not peeled even if they could have been, but if we find
270 * a peeled value for such a reference we will use it.
274 * All references in the file that can be peeled are peeled.
275 * Inversely (and this is more important), any references in the
276 * file for which no peeled value is recorded is not peelable. This
277 * trait should typically be written alongside "peeled" for
278 * compatibility with older clients, but we do not require it
279 * (i.e., "peeled" is a no-op if "fully-peeled" is set).
281 static struct packed_ref_cache
*read_packed_refs(const char *packed_refs_file
)
284 struct packed_ref_cache
*packed_refs
= xcalloc(1, sizeof(*packed_refs
));
285 struct ref_entry
*last
= NULL
;
286 struct strbuf line
= STRBUF_INIT
;
287 enum { PEELED_NONE
, PEELED_TAGS
, PEELED_FULLY
} peeled
= PEELED_NONE
;
290 acquire_packed_ref_cache(packed_refs
);
291 packed_refs
->cache
= create_ref_cache(NULL
, NULL
);
292 packed_refs
->cache
->root
->flag
&= ~REF_INCOMPLETE
;
294 f
= fopen(packed_refs_file
, "r");
296 if (errno
== ENOENT
) {
298 * This is OK; it just means that no
299 * "packed-refs" file has been written yet,
300 * which is equivalent to it being empty.
304 die_errno("couldn't read %s", packed_refs_file
);
308 stat_validity_update(&packed_refs
->validity
, fileno(f
));
310 dir
= get_ref_dir(packed_refs
->cache
->root
);
311 while (strbuf_getwholeline(&line
, f
, '\n') != EOF
) {
312 struct object_id oid
;
316 if (skip_prefix(line
.buf
, "# pack-refs with:", &traits
)) {
317 if (strstr(traits
, " fully-peeled "))
318 peeled
= PEELED_FULLY
;
319 else if (strstr(traits
, " peeled "))
320 peeled
= PEELED_TAGS
;
321 /* perhaps other traits later as well */
325 refname
= parse_ref_line(&line
, &oid
);
327 int flag
= REF_ISPACKED
;
329 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
)) {
330 if (!refname_is_safe(refname
))
331 die("packed refname is dangerous: %s", refname
);
333 flag
|= REF_BAD_NAME
| REF_ISBROKEN
;
335 last
= create_ref_entry(refname
, &oid
, flag
);
336 if (peeled
== PEELED_FULLY
||
337 (peeled
== PEELED_TAGS
&& starts_with(refname
, "refs/tags/")))
338 last
->flag
|= REF_KNOWS_PEELED
;
339 add_ref_entry(dir
, last
);
343 line
.buf
[0] == '^' &&
344 line
.len
== PEELED_LINE_LENGTH
&&
345 line
.buf
[PEELED_LINE_LENGTH
- 1] == '\n' &&
346 !get_oid_hex(line
.buf
+ 1, &oid
)) {
347 oidcpy(&last
->u
.value
.peeled
, &oid
);
349 * Regardless of what the file header said,
350 * we definitely know the value of *this*
353 last
->flag
|= REF_KNOWS_PEELED
;
358 strbuf_release(&line
);
363 static void files_reflog_path(struct files_ref_store
*refs
,
369 * FIXME: of course this is wrong in multi worktree
370 * setting. To be fixed real soon.
372 strbuf_addf(sb
, "%s/logs", refs
->gitcommondir
);
376 switch (ref_type(refname
)) {
377 case REF_TYPE_PER_WORKTREE
:
378 case REF_TYPE_PSEUDOREF
:
379 strbuf_addf(sb
, "%s/logs/%s", refs
->gitdir
, refname
);
381 case REF_TYPE_NORMAL
:
382 strbuf_addf(sb
, "%s/logs/%s", refs
->gitcommondir
, refname
);
385 die("BUG: unknown ref type %d of ref %s",
386 ref_type(refname
), refname
);
390 static void files_ref_path(struct files_ref_store
*refs
,
394 switch (ref_type(refname
)) {
395 case REF_TYPE_PER_WORKTREE
:
396 case REF_TYPE_PSEUDOREF
:
397 strbuf_addf(sb
, "%s/%s", refs
->gitdir
, refname
);
399 case REF_TYPE_NORMAL
:
400 strbuf_addf(sb
, "%s/%s", refs
->gitcommondir
, refname
);
403 die("BUG: unknown ref type %d of ref %s",
404 ref_type(refname
), refname
);
409 * Check that the packed refs cache (if any) still reflects the
410 * contents of the file. If not, clear the cache.
412 static void validate_packed_ref_cache(struct packed_ref_store
*refs
)
415 !stat_validity_check(&refs
->cache
->validity
, refs
->path
))
416 clear_packed_ref_cache(refs
);
420 * Get the packed_ref_cache for the specified packed_ref_store,
421 * creating and populating it if it hasn't been read before or if the
422 * file has been changed (according to its `validity` field) since it
423 * was last read. On the other hand, if we hold the lock, then assume
424 * that the file hasn't been changed out from under us, so skip the
425 * extra `stat()` call in `stat_validity_check()`.
427 static struct packed_ref_cache
*get_packed_ref_cache(struct packed_ref_store
*refs
)
429 if (!is_lock_file_locked(&refs
->lock
))
430 validate_packed_ref_cache(refs
);
433 refs
->cache
= read_packed_refs(refs
->path
);
438 static struct ref_dir
*get_packed_ref_dir(struct packed_ref_cache
*packed_ref_cache
)
440 return get_ref_dir(packed_ref_cache
->cache
->root
);
443 static struct ref_dir
*get_packed_refs(struct packed_ref_store
*refs
)
445 return get_packed_ref_dir(get_packed_ref_cache(refs
));
449 * Add or overwrite a reference in the in-memory packed reference
450 * cache. This may only be called while the packed-refs file is locked
451 * (see lock_packed_refs()). To actually write the packed-refs file,
452 * call commit_packed_refs().
454 static void add_packed_ref(struct packed_ref_store
*refs
,
455 const char *refname
, const struct object_id
*oid
)
457 struct ref_dir
*packed_refs
;
458 struct ref_entry
*packed_entry
;
460 if (!is_lock_file_locked(&refs
->lock
))
461 die("BUG: packed refs not locked");
463 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
464 die("Reference has invalid format: '%s'", refname
);
466 packed_refs
= get_packed_refs(refs
);
467 packed_entry
= find_ref_entry(packed_refs
, refname
);
469 /* Overwrite the existing entry: */
470 oidcpy(&packed_entry
->u
.value
.oid
, oid
);
471 packed_entry
->flag
= REF_ISPACKED
;
472 oidclr(&packed_entry
->u
.value
.peeled
);
474 packed_entry
= create_ref_entry(refname
, oid
, REF_ISPACKED
);
475 add_ref_entry(packed_refs
, packed_entry
);
480 * Read the loose references from the namespace dirname into dir
481 * (without recursing). dirname must end with '/'. dir must be the
482 * directory entry corresponding to dirname.
484 static void loose_fill_ref_dir(struct ref_store
*ref_store
,
485 struct ref_dir
*dir
, const char *dirname
)
487 struct files_ref_store
*refs
=
488 files_downcast(ref_store
, REF_STORE_READ
, "fill_ref_dir");
491 int dirnamelen
= strlen(dirname
);
492 struct strbuf refname
;
493 struct strbuf path
= STRBUF_INIT
;
496 files_ref_path(refs
, &path
, dirname
);
497 path_baselen
= path
.len
;
499 d
= opendir(path
.buf
);
501 strbuf_release(&path
);
505 strbuf_init(&refname
, dirnamelen
+ 257);
506 strbuf_add(&refname
, dirname
, dirnamelen
);
508 while ((de
= readdir(d
)) != NULL
) {
509 struct object_id oid
;
513 if (de
->d_name
[0] == '.')
515 if (ends_with(de
->d_name
, ".lock"))
517 strbuf_addstr(&refname
, de
->d_name
);
518 strbuf_addstr(&path
, de
->d_name
);
519 if (stat(path
.buf
, &st
) < 0) {
520 ; /* silently ignore */
521 } else if (S_ISDIR(st
.st_mode
)) {
522 strbuf_addch(&refname
, '/');
523 add_entry_to_dir(dir
,
524 create_dir_entry(dir
->cache
, refname
.buf
,
527 if (!refs_resolve_ref_unsafe(&refs
->base
,
532 flag
|= REF_ISBROKEN
;
533 } else if (is_null_oid(&oid
)) {
535 * It is so astronomically unlikely
536 * that NULL_SHA1 is the SHA-1 of an
537 * actual object that we consider its
538 * appearance in a loose reference
539 * file to be repo corruption
540 * (probably due to a software bug).
542 flag
|= REF_ISBROKEN
;
545 if (check_refname_format(refname
.buf
,
546 REFNAME_ALLOW_ONELEVEL
)) {
547 if (!refname_is_safe(refname
.buf
))
548 die("loose refname is dangerous: %s", refname
.buf
);
550 flag
|= REF_BAD_NAME
| REF_ISBROKEN
;
552 add_entry_to_dir(dir
,
553 create_ref_entry(refname
.buf
, &oid
, flag
));
555 strbuf_setlen(&refname
, dirnamelen
);
556 strbuf_setlen(&path
, path_baselen
);
558 strbuf_release(&refname
);
559 strbuf_release(&path
);
563 * Manually add refs/bisect, which, being per-worktree, might
564 * not appear in the directory listing for refs/ in the main
567 if (!strcmp(dirname
, "refs/")) {
568 int pos
= search_ref_dir(dir
, "refs/bisect/", 12);
571 struct ref_entry
*child_entry
= create_dir_entry(
572 dir
->cache
, "refs/bisect/", 12, 1);
573 add_entry_to_dir(dir
, child_entry
);
578 static struct ref_cache
*get_loose_ref_cache(struct files_ref_store
*refs
)
582 * Mark the top-level directory complete because we
583 * are about to read the only subdirectory that can
586 refs
->loose
= create_ref_cache(&refs
->base
, loose_fill_ref_dir
);
588 /* We're going to fill the top level ourselves: */
589 refs
->loose
->root
->flag
&= ~REF_INCOMPLETE
;
592 * Add an incomplete entry for "refs/" (to be filled
595 add_entry_to_dir(get_ref_dir(refs
->loose
->root
),
596 create_dir_entry(refs
->loose
, "refs/", 5, 1));
602 * Return the ref_entry for the given refname from the packed
603 * references. If it does not exist, return NULL.
605 static struct ref_entry
*get_packed_ref(struct files_ref_store
*refs
,
608 return find_ref_entry(get_packed_refs(refs
->packed_ref_store
), refname
);
612 * A loose ref file doesn't exist; check for a packed ref.
614 static int resolve_packed_ref(struct files_ref_store
*refs
,
616 unsigned char *sha1
, unsigned int *flags
)
618 struct ref_entry
*entry
;
621 * The loose reference file does not exist; check for a packed
624 entry
= get_packed_ref(refs
, refname
);
626 hashcpy(sha1
, entry
->u
.value
.oid
.hash
);
627 *flags
|= REF_ISPACKED
;
630 /* refname is not a packed reference. */
634 static int files_read_raw_ref(struct ref_store
*ref_store
,
635 const char *refname
, unsigned char *sha1
,
636 struct strbuf
*referent
, unsigned int *type
)
638 struct files_ref_store
*refs
=
639 files_downcast(ref_store
, REF_STORE_READ
, "read_raw_ref");
640 struct strbuf sb_contents
= STRBUF_INIT
;
641 struct strbuf sb_path
= STRBUF_INIT
;
648 int remaining_retries
= 3;
651 strbuf_reset(&sb_path
);
653 files_ref_path(refs
, &sb_path
, refname
);
659 * We might have to loop back here to avoid a race
660 * condition: first we lstat() the file, then we try
661 * to read it as a link or as a file. But if somebody
662 * changes the type of the file (file <-> directory
663 * <-> symlink) between the lstat() and reading, then
664 * we don't want to report that as an error but rather
665 * try again starting with the lstat().
667 * We'll keep a count of the retries, though, just to avoid
668 * any confusing situation sending us into an infinite loop.
671 if (remaining_retries
-- <= 0)
674 if (lstat(path
, &st
) < 0) {
677 if (resolve_packed_ref(refs
, refname
, sha1
, type
)) {
685 /* Follow "normalized" - ie "refs/.." symlinks by hand */
686 if (S_ISLNK(st
.st_mode
)) {
687 strbuf_reset(&sb_contents
);
688 if (strbuf_readlink(&sb_contents
, path
, 0) < 0) {
689 if (errno
== ENOENT
|| errno
== EINVAL
)
690 /* inconsistent with lstat; retry */
695 if (starts_with(sb_contents
.buf
, "refs/") &&
696 !check_refname_format(sb_contents
.buf
, 0)) {
697 strbuf_swap(&sb_contents
, referent
);
698 *type
|= REF_ISSYMREF
;
703 * It doesn't look like a refname; fall through to just
704 * treating it like a non-symlink, and reading whatever it
709 /* Is it a directory? */
710 if (S_ISDIR(st
.st_mode
)) {
712 * Even though there is a directory where the loose
713 * ref is supposed to be, there could still be a
716 if (resolve_packed_ref(refs
, refname
, sha1
, type
)) {
725 * Anything else, just open it and try to use it as
728 fd
= open(path
, O_RDONLY
);
730 if (errno
== ENOENT
&& !S_ISLNK(st
.st_mode
))
731 /* inconsistent with lstat; retry */
736 strbuf_reset(&sb_contents
);
737 if (strbuf_read(&sb_contents
, fd
, 256) < 0) {
738 int save_errno
= errno
;
744 strbuf_rtrim(&sb_contents
);
745 buf
= sb_contents
.buf
;
746 if (starts_with(buf
, "ref:")) {
748 while (isspace(*buf
))
751 strbuf_reset(referent
);
752 strbuf_addstr(referent
, buf
);
753 *type
|= REF_ISSYMREF
;
759 * Please note that FETCH_HEAD has additional
760 * data after the sha.
762 if (get_sha1_hex(buf
, sha1
) ||
763 (buf
[40] != '\0' && !isspace(buf
[40]))) {
764 *type
|= REF_ISBROKEN
;
773 strbuf_release(&sb_path
);
774 strbuf_release(&sb_contents
);
779 static void unlock_ref(struct ref_lock
*lock
)
781 /* Do not free lock->lk -- atexit() still looks at them */
783 rollback_lock_file(lock
->lk
);
784 free(lock
->ref_name
);
789 * Lock refname, without following symrefs, and set *lock_p to point
790 * at a newly-allocated lock object. Fill in lock->old_oid, referent,
791 * and type similarly to read_raw_ref().
793 * The caller must verify that refname is a "safe" reference name (in
794 * the sense of refname_is_safe()) before calling this function.
796 * If the reference doesn't already exist, verify that refname doesn't
797 * have a D/F conflict with any existing references. extras and skip
798 * are passed to refs_verify_refname_available() for this check.
800 * If mustexist is not set and the reference is not found or is
801 * broken, lock the reference anyway but clear sha1.
803 * Return 0 on success. On failure, write an error message to err and
804 * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR.
806 * Implementation note: This function is basically
811 * but it includes a lot more code to
812 * - Deal with possible races with other processes
813 * - Avoid calling refs_verify_refname_available() when it can be
814 * avoided, namely if we were successfully able to read the ref
815 * - Generate informative error messages in the case of failure
817 static int lock_raw_ref(struct files_ref_store
*refs
,
818 const char *refname
, int mustexist
,
819 const struct string_list
*extras
,
820 const struct string_list
*skip
,
821 struct ref_lock
**lock_p
,
822 struct strbuf
*referent
,
826 struct ref_lock
*lock
;
827 struct strbuf ref_file
= STRBUF_INIT
;
828 int attempts_remaining
= 3;
829 int ret
= TRANSACTION_GENERIC_ERROR
;
832 files_assert_main_repository(refs
, "lock_raw_ref");
836 /* First lock the file so it can't change out from under us. */
838 *lock_p
= lock
= xcalloc(1, sizeof(*lock
));
840 lock
->ref_name
= xstrdup(refname
);
841 files_ref_path(refs
, &ref_file
, refname
);
844 switch (safe_create_leading_directories(ref_file
.buf
)) {
849 * Suppose refname is "refs/foo/bar". We just failed
850 * to create the containing directory, "refs/foo",
851 * because there was a non-directory in the way. This
852 * indicates a D/F conflict, probably because of
853 * another reference such as "refs/foo". There is no
854 * reason to expect this error to be transitory.
856 if (refs_verify_refname_available(&refs
->base
, refname
,
857 extras
, skip
, err
)) {
860 * To the user the relevant error is
861 * that the "mustexist" reference is
865 strbuf_addf(err
, "unable to resolve reference '%s'",
869 * The error message set by
870 * refs_verify_refname_available() is
873 ret
= TRANSACTION_NAME_CONFLICT
;
877 * The file that is in the way isn't a loose
878 * reference. Report it as a low-level
881 strbuf_addf(err
, "unable to create lock file %s.lock; "
882 "non-directory in the way",
887 /* Maybe another process was tidying up. Try again. */
888 if (--attempts_remaining
> 0)
892 strbuf_addf(err
, "unable to create directory for %s",
898 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
900 if (hold_lock_file_for_update(lock
->lk
, ref_file
.buf
, LOCK_NO_DEREF
) < 0) {
901 if (errno
== ENOENT
&& --attempts_remaining
> 0) {
903 * Maybe somebody just deleted one of the
904 * directories leading to ref_file. Try
909 unable_to_lock_message(ref_file
.buf
, errno
, err
);
915 * Now we hold the lock and can read the reference without
916 * fear that its value will change.
919 if (files_read_raw_ref(&refs
->base
, refname
,
920 lock
->old_oid
.hash
, referent
, type
)) {
921 if (errno
== ENOENT
) {
923 /* Garden variety missing reference. */
924 strbuf_addf(err
, "unable to resolve reference '%s'",
929 * Reference is missing, but that's OK. We
930 * know that there is not a conflict with
931 * another loose reference because
932 * (supposing that we are trying to lock
933 * reference "refs/foo/bar"):
935 * - We were successfully able to create
936 * the lockfile refs/foo/bar.lock, so we
937 * know there cannot be a loose reference
940 * - We got ENOENT and not EISDIR, so we
941 * know that there cannot be a loose
942 * reference named "refs/foo/bar/baz".
945 } else if (errno
== EISDIR
) {
947 * There is a directory in the way. It might have
948 * contained references that have been deleted. If
949 * we don't require that the reference already
950 * exists, try to remove the directory so that it
951 * doesn't cause trouble when we want to rename the
952 * lockfile into place later.
955 /* Garden variety missing reference. */
956 strbuf_addf(err
, "unable to resolve reference '%s'",
959 } else if (remove_dir_recursively(&ref_file
,
960 REMOVE_DIR_EMPTY_ONLY
)) {
961 if (refs_verify_refname_available(
962 &refs
->base
, refname
,
963 extras
, skip
, err
)) {
965 * The error message set by
966 * verify_refname_available() is OK.
968 ret
= TRANSACTION_NAME_CONFLICT
;
972 * We can't delete the directory,
973 * but we also don't know of any
974 * references that it should
977 strbuf_addf(err
, "there is a non-empty directory '%s' "
978 "blocking reference '%s'",
979 ref_file
.buf
, refname
);
983 } else if (errno
== EINVAL
&& (*type
& REF_ISBROKEN
)) {
984 strbuf_addf(err
, "unable to resolve reference '%s': "
985 "reference broken", refname
);
988 strbuf_addf(err
, "unable to resolve reference '%s': %s",
989 refname
, strerror(errno
));
994 * If the ref did not exist and we are creating it,
995 * make sure there is no existing ref that conflicts
998 if (refs_verify_refname_available(
999 &refs
->base
, refname
,
1012 strbuf_release(&ref_file
);
1016 static int files_peel_ref(struct ref_store
*ref_store
,
1017 const char *refname
, unsigned char *sha1
)
1019 struct files_ref_store
*refs
=
1020 files_downcast(ref_store
, REF_STORE_READ
| REF_STORE_ODB
,
1023 unsigned char base
[20];
1025 if (current_ref_iter
&& current_ref_iter
->refname
== refname
) {
1026 struct object_id peeled
;
1028 if (ref_iterator_peel(current_ref_iter
, &peeled
))
1030 hashcpy(sha1
, peeled
.hash
);
1034 if (refs_read_ref_full(ref_store
, refname
,
1035 RESOLVE_REF_READING
, base
, &flag
))
1039 * If the reference is packed, read its ref_entry from the
1040 * cache in the hope that we already know its peeled value.
1041 * We only try this optimization on packed references because
1042 * (a) forcing the filling of the loose reference cache could
1043 * be expensive and (b) loose references anyway usually do not
1044 * have REF_KNOWS_PEELED.
1046 if (flag
& REF_ISPACKED
) {
1047 struct ref_entry
*r
= get_packed_ref(refs
, refname
);
1049 if (peel_entry(r
, 0))
1051 hashcpy(sha1
, r
->u
.value
.peeled
.hash
);
1056 return peel_object(base
, sha1
);
1059 struct files_ref_iterator
{
1060 struct ref_iterator base
;
1062 struct packed_ref_cache
*packed_ref_cache
;
1063 struct ref_iterator
*iter0
;
1067 static int files_ref_iterator_advance(struct ref_iterator
*ref_iterator
)
1069 struct files_ref_iterator
*iter
=
1070 (struct files_ref_iterator
*)ref_iterator
;
1073 while ((ok
= ref_iterator_advance(iter
->iter0
)) == ITER_OK
) {
1074 if (iter
->flags
& DO_FOR_EACH_PER_WORKTREE_ONLY
&&
1075 ref_type(iter
->iter0
->refname
) != REF_TYPE_PER_WORKTREE
)
1078 if (!(iter
->flags
& DO_FOR_EACH_INCLUDE_BROKEN
) &&
1079 !ref_resolves_to_object(iter
->iter0
->refname
,
1081 iter
->iter0
->flags
))
1084 iter
->base
.refname
= iter
->iter0
->refname
;
1085 iter
->base
.oid
= iter
->iter0
->oid
;
1086 iter
->base
.flags
= iter
->iter0
->flags
;
1091 if (ref_iterator_abort(ref_iterator
) != ITER_DONE
)
1097 static int files_ref_iterator_peel(struct ref_iterator
*ref_iterator
,
1098 struct object_id
*peeled
)
1100 struct files_ref_iterator
*iter
=
1101 (struct files_ref_iterator
*)ref_iterator
;
1103 return ref_iterator_peel(iter
->iter0
, peeled
);
1106 static int files_ref_iterator_abort(struct ref_iterator
*ref_iterator
)
1108 struct files_ref_iterator
*iter
=
1109 (struct files_ref_iterator
*)ref_iterator
;
1113 ok
= ref_iterator_abort(iter
->iter0
);
1115 release_packed_ref_cache(iter
->packed_ref_cache
);
1116 base_ref_iterator_free(ref_iterator
);
1120 static struct ref_iterator_vtable files_ref_iterator_vtable
= {
1121 files_ref_iterator_advance
,
1122 files_ref_iterator_peel
,
1123 files_ref_iterator_abort
1126 static struct ref_iterator
*files_ref_iterator_begin(
1127 struct ref_store
*ref_store
,
1128 const char *prefix
, unsigned int flags
)
1130 struct files_ref_store
*refs
;
1131 struct ref_iterator
*loose_iter
, *packed_iter
;
1132 struct files_ref_iterator
*iter
;
1133 struct ref_iterator
*ref_iterator
;
1134 unsigned int required_flags
= REF_STORE_READ
;
1136 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
))
1137 required_flags
|= REF_STORE_ODB
;
1139 refs
= files_downcast(ref_store
, required_flags
, "ref_iterator_begin");
1141 iter
= xcalloc(1, sizeof(*iter
));
1142 ref_iterator
= &iter
->base
;
1143 base_ref_iterator_init(ref_iterator
, &files_ref_iterator_vtable
);
1146 * We must make sure that all loose refs are read before
1147 * accessing the packed-refs file; this avoids a race
1148 * condition if loose refs are migrated to the packed-refs
1149 * file by a simultaneous process, but our in-memory view is
1150 * from before the migration. We ensure this as follows:
1151 * First, we call start the loose refs iteration with its
1152 * `prime_ref` argument set to true. This causes the loose
1153 * references in the subtree to be pre-read into the cache.
1154 * (If they've already been read, that's OK; we only need to
1155 * guarantee that they're read before the packed refs, not
1156 * *how much* before.) After that, we call
1157 * get_packed_ref_cache(), which internally checks whether the
1158 * packed-ref cache is up to date with what is on disk, and
1159 * re-reads it if not.
1162 loose_iter
= cache_ref_iterator_begin(get_loose_ref_cache(refs
),
1165 iter
->packed_ref_cache
= get_packed_ref_cache(refs
->packed_ref_store
);
1166 acquire_packed_ref_cache(iter
->packed_ref_cache
);
1167 packed_iter
= cache_ref_iterator_begin(iter
->packed_ref_cache
->cache
,
1170 iter
->iter0
= overlay_ref_iterator_begin(loose_iter
, packed_iter
);
1171 iter
->flags
= flags
;
1173 return ref_iterator
;
1177 * Verify that the reference locked by lock has the value old_sha1.
1178 * Fail if the reference doesn't exist and mustexist is set. Return 0
1179 * on success. On error, write an error message to err, set errno, and
1180 * return a negative value.
1182 static int verify_lock(struct ref_store
*ref_store
, struct ref_lock
*lock
,
1183 const unsigned char *old_sha1
, int mustexist
,
1188 if (refs_read_ref_full(ref_store
, lock
->ref_name
,
1189 mustexist
? RESOLVE_REF_READING
: 0,
1190 lock
->old_oid
.hash
, NULL
)) {
1192 int save_errno
= errno
;
1193 strbuf_addf(err
, "can't verify ref '%s'", lock
->ref_name
);
1197 oidclr(&lock
->old_oid
);
1201 if (old_sha1
&& hashcmp(lock
->old_oid
.hash
, old_sha1
)) {
1202 strbuf_addf(err
, "ref '%s' is at %s but expected %s",
1204 oid_to_hex(&lock
->old_oid
),
1205 sha1_to_hex(old_sha1
));
1212 static int remove_empty_directories(struct strbuf
*path
)
1215 * we want to create a file but there is a directory there;
1216 * if that is an empty directory (or a directory that contains
1217 * only empty directories), remove them.
1219 return remove_dir_recursively(path
, REMOVE_DIR_EMPTY_ONLY
);
1222 static int create_reflock(const char *path
, void *cb
)
1224 struct lock_file
*lk
= cb
;
1226 return hold_lock_file_for_update(lk
, path
, LOCK_NO_DEREF
) < 0 ? -1 : 0;
1230 * Locks a ref returning the lock on success and NULL on failure.
1231 * On failure errno is set to something meaningful.
1233 static struct ref_lock
*lock_ref_sha1_basic(struct files_ref_store
*refs
,
1234 const char *refname
,
1235 const unsigned char *old_sha1
,
1236 const struct string_list
*extras
,
1237 const struct string_list
*skip
,
1238 unsigned int flags
, int *type
,
1241 struct strbuf ref_file
= STRBUF_INIT
;
1242 struct ref_lock
*lock
;
1244 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1245 int resolve_flags
= RESOLVE_REF_NO_RECURSE
;
1248 files_assert_main_repository(refs
, "lock_ref_sha1_basic");
1251 lock
= xcalloc(1, sizeof(struct ref_lock
));
1254 resolve_flags
|= RESOLVE_REF_READING
;
1255 if (flags
& REF_DELETING
)
1256 resolve_flags
|= RESOLVE_REF_ALLOW_BAD_NAME
;
1258 files_ref_path(refs
, &ref_file
, refname
);
1259 resolved
= !!refs_resolve_ref_unsafe(&refs
->base
,
1260 refname
, resolve_flags
,
1261 lock
->old_oid
.hash
, type
);
1262 if (!resolved
&& errno
== EISDIR
) {
1264 * we are trying to lock foo but we used to
1265 * have foo/bar which now does not exist;
1266 * it is normal for the empty directory 'foo'
1269 if (remove_empty_directories(&ref_file
)) {
1271 if (!refs_verify_refname_available(
1273 refname
, extras
, skip
, err
))
1274 strbuf_addf(err
, "there are still refs under '%s'",
1278 resolved
= !!refs_resolve_ref_unsafe(&refs
->base
,
1279 refname
, resolve_flags
,
1280 lock
->old_oid
.hash
, type
);
1284 if (last_errno
!= ENOTDIR
||
1285 !refs_verify_refname_available(&refs
->base
, refname
,
1287 strbuf_addf(err
, "unable to resolve reference '%s': %s",
1288 refname
, strerror(last_errno
));
1294 * If the ref did not exist and we are creating it, make sure
1295 * there is no existing packed ref whose name begins with our
1296 * refname, nor a packed ref whose name is a proper prefix of
1299 if (is_null_oid(&lock
->old_oid
) &&
1300 refs_verify_refname_available(&refs
->base
, refname
,
1301 extras
, skip
, err
)) {
1302 last_errno
= ENOTDIR
;
1306 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1308 lock
->ref_name
= xstrdup(refname
);
1310 if (raceproof_create_file(ref_file
.buf
, create_reflock
, lock
->lk
)) {
1312 unable_to_lock_message(ref_file
.buf
, errno
, err
);
1316 if (verify_lock(&refs
->base
, lock
, old_sha1
, mustexist
, err
)) {
1327 strbuf_release(&ref_file
);
1333 * Write an entry to the packed-refs file for the specified refname.
1334 * If peeled is non-NULL, write it as the entry's peeled value.
1336 static void write_packed_entry(FILE *fh
, const char *refname
,
1337 const unsigned char *sha1
,
1338 const unsigned char *peeled
)
1340 fprintf_or_die(fh
, "%s %s\n", sha1_to_hex(sha1
), refname
);
1342 fprintf_or_die(fh
, "^%s\n", sha1_to_hex(peeled
));
1346 * Lock the packed-refs file for writing. Flags is passed to
1347 * hold_lock_file_for_update(). Return 0 on success. On errors, set
1348 * errno appropriately and return a nonzero value.
1350 static int lock_packed_refs(struct packed_ref_store
*refs
, int flags
)
1352 static int timeout_configured
= 0;
1353 static int timeout_value
= 1000;
1354 struct packed_ref_cache
*packed_ref_cache
;
1356 packed_assert_main_repository(refs
, "lock_packed_refs");
1358 if (!timeout_configured
) {
1359 git_config_get_int("core.packedrefstimeout", &timeout_value
);
1360 timeout_configured
= 1;
1363 if (hold_lock_file_for_update_timeout(
1366 flags
, timeout_value
) < 0)
1370 * Now that we hold the `packed-refs` lock, make sure that our
1371 * cache matches the current version of the file. Normally
1372 * `get_packed_ref_cache()` does that for us, but that
1373 * function assumes that when the file is locked, any existing
1374 * cache is still valid. We've just locked the file, but it
1375 * might have changed the moment *before* we locked it.
1377 validate_packed_ref_cache(refs
);
1379 packed_ref_cache
= get_packed_ref_cache(refs
);
1380 /* Increment the reference count to prevent it from being freed: */
1381 acquire_packed_ref_cache(packed_ref_cache
);
1386 * Write the current version of the packed refs cache from memory to
1387 * disk. The packed-refs file must already be locked for writing (see
1388 * lock_packed_refs()). Return zero on success. On errors, set errno
1389 * and return a nonzero value
1391 static int commit_packed_refs(struct files_ref_store
*refs
)
1393 struct packed_ref_cache
*packed_ref_cache
=
1394 get_packed_ref_cache(refs
->packed_ref_store
);
1398 struct ref_iterator
*iter
;
1400 files_assert_main_repository(refs
, "commit_packed_refs");
1402 if (!is_lock_file_locked(&refs
->packed_ref_store
->lock
))
1403 die("BUG: packed-refs not locked");
1405 out
= fdopen_lock_file(&refs
->packed_ref_store
->lock
, "w");
1407 die_errno("unable to fdopen packed-refs descriptor");
1409 fprintf_or_die(out
, "%s", PACKED_REFS_HEADER
);
1411 iter
= cache_ref_iterator_begin(packed_ref_cache
->cache
, NULL
, 0);
1412 while ((ok
= ref_iterator_advance(iter
)) == ITER_OK
) {
1413 struct object_id peeled
;
1414 int peel_error
= ref_iterator_peel(iter
, &peeled
);
1416 write_packed_entry(out
, iter
->refname
, iter
->oid
->hash
,
1417 peel_error
? NULL
: peeled
.hash
);
1420 if (ok
!= ITER_DONE
)
1421 die("error while iterating over references");
1423 if (commit_lock_file(&refs
->packed_ref_store
->lock
)) {
1427 release_packed_ref_cache(packed_ref_cache
);
1433 * Rollback the lockfile for the packed-refs file, and discard the
1434 * in-memory packed reference cache. (The packed-refs file will be
1435 * read anew if it is needed again after this function is called.)
1437 static void rollback_packed_refs(struct files_ref_store
*refs
)
1439 struct packed_ref_cache
*packed_ref_cache
=
1440 get_packed_ref_cache(refs
->packed_ref_store
);
1442 files_assert_main_repository(refs
, "rollback_packed_refs");
1444 if (!is_lock_file_locked(&refs
->packed_ref_store
->lock
))
1445 die("BUG: packed-refs not locked");
1446 rollback_lock_file(&refs
->packed_ref_store
->lock
);
1447 release_packed_ref_cache(packed_ref_cache
);
1448 clear_packed_ref_cache(refs
->packed_ref_store
);
1451 struct ref_to_prune
{
1452 struct ref_to_prune
*next
;
1453 unsigned char sha1
[20];
1454 char name
[FLEX_ARRAY
];
1458 REMOVE_EMPTY_PARENTS_REF
= 0x01,
1459 REMOVE_EMPTY_PARENTS_REFLOG
= 0x02
1463 * Remove empty parent directories associated with the specified
1464 * reference and/or its reflog, but spare [logs/]refs/ and immediate
1465 * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or
1466 * REMOVE_EMPTY_PARENTS_REFLOG.
1468 static void try_remove_empty_parents(struct files_ref_store
*refs
,
1469 const char *refname
,
1472 struct strbuf buf
= STRBUF_INIT
;
1473 struct strbuf sb
= STRBUF_INIT
;
1477 strbuf_addstr(&buf
, refname
);
1479 for (i
= 0; i
< 2; i
++) { /* refs/{heads,tags,...}/ */
1480 while (*p
&& *p
!= '/')
1482 /* tolerate duplicate slashes; see check_refname_format() */
1486 q
= buf
.buf
+ buf
.len
;
1487 while (flags
& (REMOVE_EMPTY_PARENTS_REF
| REMOVE_EMPTY_PARENTS_REFLOG
)) {
1488 while (q
> p
&& *q
!= '/')
1490 while (q
> p
&& *(q
-1) == '/')
1494 strbuf_setlen(&buf
, q
- buf
.buf
);
1497 files_ref_path(refs
, &sb
, buf
.buf
);
1498 if ((flags
& REMOVE_EMPTY_PARENTS_REF
) && rmdir(sb
.buf
))
1499 flags
&= ~REMOVE_EMPTY_PARENTS_REF
;
1502 files_reflog_path(refs
, &sb
, buf
.buf
);
1503 if ((flags
& REMOVE_EMPTY_PARENTS_REFLOG
) && rmdir(sb
.buf
))
1504 flags
&= ~REMOVE_EMPTY_PARENTS_REFLOG
;
1506 strbuf_release(&buf
);
1507 strbuf_release(&sb
);
1510 /* make sure nobody touched the ref, and unlink */
1511 static void prune_ref(struct files_ref_store
*refs
, struct ref_to_prune
*r
)
1513 struct ref_transaction
*transaction
;
1514 struct strbuf err
= STRBUF_INIT
;
1516 if (check_refname_format(r
->name
, 0))
1519 transaction
= ref_store_transaction_begin(&refs
->base
, &err
);
1521 ref_transaction_delete(transaction
, r
->name
, r
->sha1
,
1522 REF_ISPRUNING
| REF_NODEREF
, NULL
, &err
) ||
1523 ref_transaction_commit(transaction
, &err
)) {
1524 ref_transaction_free(transaction
);
1525 error("%s", err
.buf
);
1526 strbuf_release(&err
);
1529 ref_transaction_free(transaction
);
1530 strbuf_release(&err
);
1533 static void prune_refs(struct files_ref_store
*refs
, struct ref_to_prune
*r
)
1542 * Return true if the specified reference should be packed.
1544 static int should_pack_ref(const char *refname
,
1545 const struct object_id
*oid
, unsigned int ref_flags
,
1546 unsigned int pack_flags
)
1548 /* Do not pack per-worktree refs: */
1549 if (ref_type(refname
) != REF_TYPE_NORMAL
)
1552 /* Do not pack non-tags unless PACK_REFS_ALL is set: */
1553 if (!(pack_flags
& PACK_REFS_ALL
) && !starts_with(refname
, "refs/tags/"))
1556 /* Do not pack symbolic refs: */
1557 if (ref_flags
& REF_ISSYMREF
)
1560 /* Do not pack broken refs: */
1561 if (!ref_resolves_to_object(refname
, oid
, ref_flags
))
1567 static int files_pack_refs(struct ref_store
*ref_store
, unsigned int flags
)
1569 struct files_ref_store
*refs
=
1570 files_downcast(ref_store
, REF_STORE_WRITE
| REF_STORE_ODB
,
1572 struct ref_iterator
*iter
;
1574 struct ref_to_prune
*refs_to_prune
= NULL
;
1576 lock_packed_refs(refs
->packed_ref_store
, LOCK_DIE_ON_ERROR
);
1578 iter
= cache_ref_iterator_begin(get_loose_ref_cache(refs
), NULL
, 0);
1579 while ((ok
= ref_iterator_advance(iter
)) == ITER_OK
) {
1581 * If the loose reference can be packed, add an entry
1582 * in the packed ref cache. If the reference should be
1583 * pruned, also add it to refs_to_prune.
1585 if (!should_pack_ref(iter
->refname
, iter
->oid
, iter
->flags
,
1590 * Create an entry in the packed-refs cache equivalent
1591 * to the one from the loose ref cache, except that
1592 * we don't copy the peeled status, because we want it
1595 add_packed_ref(refs
->packed_ref_store
, iter
->refname
, iter
->oid
);
1597 /* Schedule the loose reference for pruning if requested. */
1598 if ((flags
& PACK_REFS_PRUNE
)) {
1599 struct ref_to_prune
*n
;
1600 FLEX_ALLOC_STR(n
, name
, iter
->refname
);
1601 hashcpy(n
->sha1
, iter
->oid
->hash
);
1602 n
->next
= refs_to_prune
;
1606 if (ok
!= ITER_DONE
)
1607 die("error while iterating over references");
1609 if (commit_packed_refs(refs
))
1610 die_errno("unable to overwrite old ref-pack file");
1612 prune_refs(refs
, refs_to_prune
);
1617 * Rewrite the packed-refs file, omitting any refs listed in
1618 * 'refnames'. On error, leave packed-refs unchanged, write an error
1619 * message to 'err', and return a nonzero value.
1621 * The refs in 'refnames' needn't be sorted. `err` must not be NULL.
1623 static int repack_without_refs(struct files_ref_store
*refs
,
1624 struct string_list
*refnames
, struct strbuf
*err
)
1626 struct ref_dir
*packed
;
1627 struct string_list_item
*refname
;
1628 int ret
, needs_repacking
= 0, removed
= 0;
1630 files_assert_main_repository(refs
, "repack_without_refs");
1633 /* Look for a packed ref */
1634 for_each_string_list_item(refname
, refnames
) {
1635 if (get_packed_ref(refs
, refname
->string
)) {
1636 needs_repacking
= 1;
1641 /* Avoid locking if we have nothing to do */
1642 if (!needs_repacking
)
1643 return 0; /* no refname exists in packed refs */
1645 if (lock_packed_refs(refs
->packed_ref_store
, 0)) {
1646 unable_to_lock_message(refs
->packed_ref_store
->path
, errno
, err
);
1649 packed
= get_packed_refs(refs
->packed_ref_store
);
1651 /* Remove refnames from the cache */
1652 for_each_string_list_item(refname
, refnames
)
1653 if (remove_entry_from_dir(packed
, refname
->string
) != -1)
1657 * All packed entries disappeared while we were
1658 * acquiring the lock.
1660 rollback_packed_refs(refs
);
1664 /* Write what remains */
1665 ret
= commit_packed_refs(refs
);
1667 strbuf_addf(err
, "unable to overwrite old ref-pack file: %s",
1672 static int files_delete_refs(struct ref_store
*ref_store
, const char *msg
,
1673 struct string_list
*refnames
, unsigned int flags
)
1675 struct files_ref_store
*refs
=
1676 files_downcast(ref_store
, REF_STORE_WRITE
, "delete_refs");
1677 struct strbuf err
= STRBUF_INIT
;
1683 result
= repack_without_refs(refs
, refnames
, &err
);
1686 * If we failed to rewrite the packed-refs file, then
1687 * it is unsafe to try to remove loose refs, because
1688 * doing so might expose an obsolete packed value for
1689 * a reference that might even point at an object that
1690 * has been garbage collected.
1692 if (refnames
->nr
== 1)
1693 error(_("could not delete reference %s: %s"),
1694 refnames
->items
[0].string
, err
.buf
);
1696 error(_("could not delete references: %s"), err
.buf
);
1701 for (i
= 0; i
< refnames
->nr
; i
++) {
1702 const char *refname
= refnames
->items
[i
].string
;
1704 if (refs_delete_ref(&refs
->base
, msg
, refname
, NULL
, flags
))
1705 result
|= error(_("could not remove reference %s"), refname
);
1709 strbuf_release(&err
);
1714 * People using contrib's git-new-workdir have .git/logs/refs ->
1715 * /some/other/path/.git/logs/refs, and that may live on another device.
1717 * IOW, to avoid cross device rename errors, the temporary renamed log must
1718 * live into logs/refs.
1720 #define TMP_RENAMED_LOG "refs/.tmp-renamed-log"
1723 const char *tmp_renamed_log
;
1727 static int rename_tmp_log_callback(const char *path
, void *cb_data
)
1729 struct rename_cb
*cb
= cb_data
;
1731 if (rename(cb
->tmp_renamed_log
, path
)) {
1733 * rename(a, b) when b is an existing directory ought
1734 * to result in ISDIR, but Solaris 5.8 gives ENOTDIR.
1735 * Sheesh. Record the true errno for error reporting,
1736 * but report EISDIR to raceproof_create_file() so
1737 * that it knows to retry.
1739 cb
->true_errno
= errno
;
1740 if (errno
== ENOTDIR
)
1748 static int rename_tmp_log(struct files_ref_store
*refs
, const char *newrefname
)
1750 struct strbuf path
= STRBUF_INIT
;
1751 struct strbuf tmp
= STRBUF_INIT
;
1752 struct rename_cb cb
;
1755 files_reflog_path(refs
, &path
, newrefname
);
1756 files_reflog_path(refs
, &tmp
, TMP_RENAMED_LOG
);
1757 cb
.tmp_renamed_log
= tmp
.buf
;
1758 ret
= raceproof_create_file(path
.buf
, rename_tmp_log_callback
, &cb
);
1760 if (errno
== EISDIR
)
1761 error("directory not empty: %s", path
.buf
);
1763 error("unable to move logfile %s to %s: %s",
1765 strerror(cb
.true_errno
));
1768 strbuf_release(&path
);
1769 strbuf_release(&tmp
);
1773 static int write_ref_to_lockfile(struct ref_lock
*lock
,
1774 const struct object_id
*oid
, struct strbuf
*err
);
1775 static int commit_ref_update(struct files_ref_store
*refs
,
1776 struct ref_lock
*lock
,
1777 const struct object_id
*oid
, const char *logmsg
,
1778 struct strbuf
*err
);
1780 static int files_rename_ref(struct ref_store
*ref_store
,
1781 const char *oldrefname
, const char *newrefname
,
1784 struct files_ref_store
*refs
=
1785 files_downcast(ref_store
, REF_STORE_WRITE
, "rename_ref");
1786 struct object_id oid
, orig_oid
;
1787 int flag
= 0, logmoved
= 0;
1788 struct ref_lock
*lock
;
1789 struct stat loginfo
;
1790 struct strbuf sb_oldref
= STRBUF_INIT
;
1791 struct strbuf sb_newref
= STRBUF_INIT
;
1792 struct strbuf tmp_renamed_log
= STRBUF_INIT
;
1794 struct strbuf err
= STRBUF_INIT
;
1796 files_reflog_path(refs
, &sb_oldref
, oldrefname
);
1797 files_reflog_path(refs
, &sb_newref
, newrefname
);
1798 files_reflog_path(refs
, &tmp_renamed_log
, TMP_RENAMED_LOG
);
1800 log
= !lstat(sb_oldref
.buf
, &loginfo
);
1801 if (log
&& S_ISLNK(loginfo
.st_mode
)) {
1802 ret
= error("reflog for %s is a symlink", oldrefname
);
1806 if (!refs_resolve_ref_unsafe(&refs
->base
, oldrefname
,
1807 RESOLVE_REF_READING
| RESOLVE_REF_NO_RECURSE
,
1808 orig_oid
.hash
, &flag
)) {
1809 ret
= error("refname %s not found", oldrefname
);
1813 if (flag
& REF_ISSYMREF
) {
1814 ret
= error("refname %s is a symbolic ref, renaming it is not supported",
1818 if (!refs_rename_ref_available(&refs
->base
, oldrefname
, newrefname
)) {
1823 if (log
&& rename(sb_oldref
.buf
, tmp_renamed_log
.buf
)) {
1824 ret
= error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG
": %s",
1825 oldrefname
, strerror(errno
));
1829 if (refs_delete_ref(&refs
->base
, logmsg
, oldrefname
,
1830 orig_oid
.hash
, REF_NODEREF
)) {
1831 error("unable to delete old %s", oldrefname
);
1836 * Since we are doing a shallow lookup, oid is not the
1837 * correct value to pass to delete_ref as old_oid. But that
1838 * doesn't matter, because an old_oid check wouldn't add to
1839 * the safety anyway; we want to delete the reference whatever
1840 * its current value.
1842 if (!refs_read_ref_full(&refs
->base
, newrefname
,
1843 RESOLVE_REF_READING
| RESOLVE_REF_NO_RECURSE
,
1845 refs_delete_ref(&refs
->base
, NULL
, newrefname
,
1846 NULL
, REF_NODEREF
)) {
1847 if (errno
== EISDIR
) {
1848 struct strbuf path
= STRBUF_INIT
;
1851 files_ref_path(refs
, &path
, newrefname
);
1852 result
= remove_empty_directories(&path
);
1853 strbuf_release(&path
);
1856 error("Directory not empty: %s", newrefname
);
1860 error("unable to delete existing %s", newrefname
);
1865 if (log
&& rename_tmp_log(refs
, newrefname
))
1870 lock
= lock_ref_sha1_basic(refs
, newrefname
, NULL
, NULL
, NULL
,
1871 REF_NODEREF
, NULL
, &err
);
1873 error("unable to rename '%s' to '%s': %s", oldrefname
, newrefname
, err
.buf
);
1874 strbuf_release(&err
);
1877 oidcpy(&lock
->old_oid
, &orig_oid
);
1879 if (write_ref_to_lockfile(lock
, &orig_oid
, &err
) ||
1880 commit_ref_update(refs
, lock
, &orig_oid
, logmsg
, &err
)) {
1881 error("unable to write current sha1 into %s: %s", newrefname
, err
.buf
);
1882 strbuf_release(&err
);
1890 lock
= lock_ref_sha1_basic(refs
, oldrefname
, NULL
, NULL
, NULL
,
1891 REF_NODEREF
, NULL
, &err
);
1893 error("unable to lock %s for rollback: %s", oldrefname
, err
.buf
);
1894 strbuf_release(&err
);
1898 flag
= log_all_ref_updates
;
1899 log_all_ref_updates
= LOG_REFS_NONE
;
1900 if (write_ref_to_lockfile(lock
, &orig_oid
, &err
) ||
1901 commit_ref_update(refs
, lock
, &orig_oid
, NULL
, &err
)) {
1902 error("unable to write current sha1 into %s: %s", oldrefname
, err
.buf
);
1903 strbuf_release(&err
);
1905 log_all_ref_updates
= flag
;
1908 if (logmoved
&& rename(sb_newref
.buf
, sb_oldref
.buf
))
1909 error("unable to restore logfile %s from %s: %s",
1910 oldrefname
, newrefname
, strerror(errno
));
1911 if (!logmoved
&& log
&&
1912 rename(tmp_renamed_log
.buf
, sb_oldref
.buf
))
1913 error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG
": %s",
1914 oldrefname
, strerror(errno
));
1917 strbuf_release(&sb_newref
);
1918 strbuf_release(&sb_oldref
);
1919 strbuf_release(&tmp_renamed_log
);
1924 static int close_ref(struct ref_lock
*lock
)
1926 if (close_lock_file(lock
->lk
))
1931 static int commit_ref(struct ref_lock
*lock
)
1933 char *path
= get_locked_file_path(lock
->lk
);
1936 if (!lstat(path
, &st
) && S_ISDIR(st
.st_mode
)) {
1938 * There is a directory at the path we want to rename
1939 * the lockfile to. Hopefully it is empty; try to
1942 size_t len
= strlen(path
);
1943 struct strbuf sb_path
= STRBUF_INIT
;
1945 strbuf_attach(&sb_path
, path
, len
, len
);
1948 * If this fails, commit_lock_file() will also fail
1949 * and will report the problem.
1951 remove_empty_directories(&sb_path
);
1952 strbuf_release(&sb_path
);
1957 if (commit_lock_file(lock
->lk
))
1962 static int open_or_create_logfile(const char *path
, void *cb
)
1966 *fd
= open(path
, O_APPEND
| O_WRONLY
| O_CREAT
, 0666);
1967 return (*fd
< 0) ? -1 : 0;
1971 * Create a reflog for a ref. If force_create = 0, only create the
1972 * reflog for certain refs (those for which should_autocreate_reflog
1973 * returns non-zero). Otherwise, create it regardless of the reference
1974 * name. If the logfile already existed or was created, return 0 and
1975 * set *logfd to the file descriptor opened for appending to the file.
1976 * If no logfile exists and we decided not to create one, return 0 and
1977 * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and
1980 static int log_ref_setup(struct files_ref_store
*refs
,
1981 const char *refname
, int force_create
,
1982 int *logfd
, struct strbuf
*err
)
1984 struct strbuf logfile_sb
= STRBUF_INIT
;
1987 files_reflog_path(refs
, &logfile_sb
, refname
);
1988 logfile
= strbuf_detach(&logfile_sb
, NULL
);
1990 if (force_create
|| should_autocreate_reflog(refname
)) {
1991 if (raceproof_create_file(logfile
, open_or_create_logfile
, logfd
)) {
1992 if (errno
== ENOENT
)
1993 strbuf_addf(err
, "unable to create directory for '%s': "
1994 "%s", logfile
, strerror(errno
));
1995 else if (errno
== EISDIR
)
1996 strbuf_addf(err
, "there are still logs under '%s'",
1999 strbuf_addf(err
, "unable to append to '%s': %s",
2000 logfile
, strerror(errno
));
2005 *logfd
= open(logfile
, O_APPEND
| O_WRONLY
, 0666);
2007 if (errno
== ENOENT
|| errno
== EISDIR
) {
2009 * The logfile doesn't already exist,
2010 * but that is not an error; it only
2011 * means that we won't write log
2016 strbuf_addf(err
, "unable to append to '%s': %s",
2017 logfile
, strerror(errno
));
2024 adjust_shared_perm(logfile
);
2034 static int files_create_reflog(struct ref_store
*ref_store
,
2035 const char *refname
, int force_create
,
2038 struct files_ref_store
*refs
=
2039 files_downcast(ref_store
, REF_STORE_WRITE
, "create_reflog");
2042 if (log_ref_setup(refs
, refname
, force_create
, &fd
, err
))
2051 static int log_ref_write_fd(int fd
, const struct object_id
*old_oid
,
2052 const struct object_id
*new_oid
,
2053 const char *committer
, const char *msg
)
2055 int msglen
, written
;
2056 unsigned maxlen
, len
;
2059 msglen
= msg
? strlen(msg
) : 0;
2060 maxlen
= strlen(committer
) + msglen
+ 100;
2061 logrec
= xmalloc(maxlen
);
2062 len
= xsnprintf(logrec
, maxlen
, "%s %s %s\n",
2063 oid_to_hex(old_oid
),
2064 oid_to_hex(new_oid
),
2067 len
+= copy_reflog_msg(logrec
+ len
- 1, msg
) - 1;
2069 written
= len
<= maxlen
? write_in_full(fd
, logrec
, len
) : -1;
2077 static int files_log_ref_write(struct files_ref_store
*refs
,
2078 const char *refname
, const struct object_id
*old_oid
,
2079 const struct object_id
*new_oid
, const char *msg
,
2080 int flags
, struct strbuf
*err
)
2084 if (log_all_ref_updates
== LOG_REFS_UNSET
)
2085 log_all_ref_updates
= is_bare_repository() ? LOG_REFS_NONE
: LOG_REFS_NORMAL
;
2087 result
= log_ref_setup(refs
, refname
,
2088 flags
& REF_FORCE_CREATE_REFLOG
,
2096 result
= log_ref_write_fd(logfd
, old_oid
, new_oid
,
2097 git_committer_info(0), msg
);
2099 struct strbuf sb
= STRBUF_INIT
;
2100 int save_errno
= errno
;
2102 files_reflog_path(refs
, &sb
, refname
);
2103 strbuf_addf(err
, "unable to append to '%s': %s",
2104 sb
.buf
, strerror(save_errno
));
2105 strbuf_release(&sb
);
2110 struct strbuf sb
= STRBUF_INIT
;
2111 int save_errno
= errno
;
2113 files_reflog_path(refs
, &sb
, refname
);
2114 strbuf_addf(err
, "unable to append to '%s': %s",
2115 sb
.buf
, strerror(save_errno
));
2116 strbuf_release(&sb
);
2123 * Write sha1 into the open lockfile, then close the lockfile. On
2124 * errors, rollback the lockfile, fill in *err and
2127 static int write_ref_to_lockfile(struct ref_lock
*lock
,
2128 const struct object_id
*oid
, struct strbuf
*err
)
2130 static char term
= '\n';
2134 o
= parse_object(oid
);
2137 "trying to write ref '%s' with nonexistent object %s",
2138 lock
->ref_name
, oid_to_hex(oid
));
2142 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
2144 "trying to write non-commit object %s to branch '%s'",
2145 oid_to_hex(oid
), lock
->ref_name
);
2149 fd
= get_lock_file_fd(lock
->lk
);
2150 if (write_in_full(fd
, oid_to_hex(oid
), GIT_SHA1_HEXSZ
) != GIT_SHA1_HEXSZ
||
2151 write_in_full(fd
, &term
, 1) != 1 ||
2152 close_ref(lock
) < 0) {
2154 "couldn't write '%s'", get_lock_file_path(lock
->lk
));
2162 * Commit a change to a loose reference that has already been written
2163 * to the loose reference lockfile. Also update the reflogs if
2164 * necessary, using the specified lockmsg (which can be NULL).
2166 static int commit_ref_update(struct files_ref_store
*refs
,
2167 struct ref_lock
*lock
,
2168 const struct object_id
*oid
, const char *logmsg
,
2171 files_assert_main_repository(refs
, "commit_ref_update");
2173 clear_loose_ref_cache(refs
);
2174 if (files_log_ref_write(refs
, lock
->ref_name
,
2175 &lock
->old_oid
, oid
,
2177 char *old_msg
= strbuf_detach(err
, NULL
);
2178 strbuf_addf(err
, "cannot update the ref '%s': %s",
2179 lock
->ref_name
, old_msg
);
2185 if (strcmp(lock
->ref_name
, "HEAD") != 0) {
2187 * Special hack: If a branch is updated directly and HEAD
2188 * points to it (may happen on the remote side of a push
2189 * for example) then logically the HEAD reflog should be
2191 * A generic solution implies reverse symref information,
2192 * but finding all symrefs pointing to the given branch
2193 * would be rather costly for this rare event (the direct
2194 * update of a branch) to be worth it. So let's cheat and
2195 * check with HEAD only which should cover 99% of all usage
2196 * scenarios (even 100% of the default ones).
2198 struct object_id head_oid
;
2200 const char *head_ref
;
2202 head_ref
= refs_resolve_ref_unsafe(&refs
->base
, "HEAD",
2203 RESOLVE_REF_READING
,
2204 head_oid
.hash
, &head_flag
);
2205 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
2206 !strcmp(head_ref
, lock
->ref_name
)) {
2207 struct strbuf log_err
= STRBUF_INIT
;
2208 if (files_log_ref_write(refs
, "HEAD",
2209 &lock
->old_oid
, oid
,
2210 logmsg
, 0, &log_err
)) {
2211 error("%s", log_err
.buf
);
2212 strbuf_release(&log_err
);
2217 if (commit_ref(lock
)) {
2218 strbuf_addf(err
, "couldn't set '%s'", lock
->ref_name
);
2227 static int create_ref_symlink(struct ref_lock
*lock
, const char *target
)
2230 #ifndef NO_SYMLINK_HEAD
2231 char *ref_path
= get_locked_file_path(lock
->lk
);
2233 ret
= symlink(target
, ref_path
);
2237 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
2242 static void update_symref_reflog(struct files_ref_store
*refs
,
2243 struct ref_lock
*lock
, const char *refname
,
2244 const char *target
, const char *logmsg
)
2246 struct strbuf err
= STRBUF_INIT
;
2247 struct object_id new_oid
;
2249 !refs_read_ref_full(&refs
->base
, target
,
2250 RESOLVE_REF_READING
, new_oid
.hash
, NULL
) &&
2251 files_log_ref_write(refs
, refname
, &lock
->old_oid
,
2252 &new_oid
, logmsg
, 0, &err
)) {
2253 error("%s", err
.buf
);
2254 strbuf_release(&err
);
2258 static int create_symref_locked(struct files_ref_store
*refs
,
2259 struct ref_lock
*lock
, const char *refname
,
2260 const char *target
, const char *logmsg
)
2262 if (prefer_symlink_refs
&& !create_ref_symlink(lock
, target
)) {
2263 update_symref_reflog(refs
, lock
, refname
, target
, logmsg
);
2267 if (!fdopen_lock_file(lock
->lk
, "w"))
2268 return error("unable to fdopen %s: %s",
2269 lock
->lk
->tempfile
.filename
.buf
, strerror(errno
));
2271 update_symref_reflog(refs
, lock
, refname
, target
, logmsg
);
2273 /* no error check; commit_ref will check ferror */
2274 fprintf(lock
->lk
->tempfile
.fp
, "ref: %s\n", target
);
2275 if (commit_ref(lock
) < 0)
2276 return error("unable to write symref for %s: %s", refname
,
2281 static int files_create_symref(struct ref_store
*ref_store
,
2282 const char *refname
, const char *target
,
2285 struct files_ref_store
*refs
=
2286 files_downcast(ref_store
, REF_STORE_WRITE
, "create_symref");
2287 struct strbuf err
= STRBUF_INIT
;
2288 struct ref_lock
*lock
;
2291 lock
= lock_ref_sha1_basic(refs
, refname
, NULL
,
2292 NULL
, NULL
, REF_NODEREF
, NULL
,
2295 error("%s", err
.buf
);
2296 strbuf_release(&err
);
2300 ret
= create_symref_locked(refs
, lock
, refname
, target
, logmsg
);
2305 static int files_reflog_exists(struct ref_store
*ref_store
,
2306 const char *refname
)
2308 struct files_ref_store
*refs
=
2309 files_downcast(ref_store
, REF_STORE_READ
, "reflog_exists");
2310 struct strbuf sb
= STRBUF_INIT
;
2314 files_reflog_path(refs
, &sb
, refname
);
2315 ret
= !lstat(sb
.buf
, &st
) && S_ISREG(st
.st_mode
);
2316 strbuf_release(&sb
);
2320 static int files_delete_reflog(struct ref_store
*ref_store
,
2321 const char *refname
)
2323 struct files_ref_store
*refs
=
2324 files_downcast(ref_store
, REF_STORE_WRITE
, "delete_reflog");
2325 struct strbuf sb
= STRBUF_INIT
;
2328 files_reflog_path(refs
, &sb
, refname
);
2329 ret
= remove_path(sb
.buf
);
2330 strbuf_release(&sb
);
2334 static int show_one_reflog_ent(struct strbuf
*sb
, each_reflog_ent_fn fn
, void *cb_data
)
2336 struct object_id ooid
, noid
;
2337 char *email_end
, *message
;
2338 timestamp_t timestamp
;
2340 const char *p
= sb
->buf
;
2342 /* old SP new SP name <email> SP time TAB msg LF */
2343 if (!sb
->len
|| sb
->buf
[sb
->len
- 1] != '\n' ||
2344 parse_oid_hex(p
, &ooid
, &p
) || *p
++ != ' ' ||
2345 parse_oid_hex(p
, &noid
, &p
) || *p
++ != ' ' ||
2346 !(email_end
= strchr(p
, '>')) ||
2347 email_end
[1] != ' ' ||
2348 !(timestamp
= parse_timestamp(email_end
+ 2, &message
, 10)) ||
2349 !message
|| message
[0] != ' ' ||
2350 (message
[1] != '+' && message
[1] != '-') ||
2351 !isdigit(message
[2]) || !isdigit(message
[3]) ||
2352 !isdigit(message
[4]) || !isdigit(message
[5]))
2353 return 0; /* corrupt? */
2354 email_end
[1] = '\0';
2355 tz
= strtol(message
+ 1, NULL
, 10);
2356 if (message
[6] != '\t')
2360 return fn(&ooid
, &noid
, p
, timestamp
, tz
, message
, cb_data
);
2363 static char *find_beginning_of_line(char *bob
, char *scan
)
2365 while (bob
< scan
&& *(--scan
) != '\n')
2366 ; /* keep scanning backwards */
2368 * Return either beginning of the buffer, or LF at the end of
2369 * the previous line.
2374 static int files_for_each_reflog_ent_reverse(struct ref_store
*ref_store
,
2375 const char *refname
,
2376 each_reflog_ent_fn fn
,
2379 struct files_ref_store
*refs
=
2380 files_downcast(ref_store
, REF_STORE_READ
,
2381 "for_each_reflog_ent_reverse");
2382 struct strbuf sb
= STRBUF_INIT
;
2385 int ret
= 0, at_tail
= 1;
2387 files_reflog_path(refs
, &sb
, refname
);
2388 logfp
= fopen(sb
.buf
, "r");
2389 strbuf_release(&sb
);
2393 /* Jump to the end */
2394 if (fseek(logfp
, 0, SEEK_END
) < 0)
2395 ret
= error("cannot seek back reflog for %s: %s",
2396 refname
, strerror(errno
));
2398 while (!ret
&& 0 < pos
) {
2404 /* Fill next block from the end */
2405 cnt
= (sizeof(buf
) < pos
) ? sizeof(buf
) : pos
;
2406 if (fseek(logfp
, pos
- cnt
, SEEK_SET
)) {
2407 ret
= error("cannot seek back reflog for %s: %s",
2408 refname
, strerror(errno
));
2411 nread
= fread(buf
, cnt
, 1, logfp
);
2413 ret
= error("cannot read %d bytes from reflog for %s: %s",
2414 cnt
, refname
, strerror(errno
));
2419 scanp
= endp
= buf
+ cnt
;
2420 if (at_tail
&& scanp
[-1] == '\n')
2421 /* Looking at the final LF at the end of the file */
2425 while (buf
< scanp
) {
2427 * terminating LF of the previous line, or the beginning
2432 bp
= find_beginning_of_line(buf
, scanp
);
2436 * The newline is the end of the previous line,
2437 * so we know we have complete line starting
2438 * at (bp + 1). Prefix it onto any prior data
2439 * we collected for the line and process it.
2441 strbuf_splice(&sb
, 0, 0, bp
+ 1, endp
- (bp
+ 1));
2444 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2450 * We are at the start of the buffer, and the
2451 * start of the file; there is no previous
2452 * line, and we have everything for this one.
2453 * Process it, and we can end the loop.
2455 strbuf_splice(&sb
, 0, 0, buf
, endp
- buf
);
2456 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2463 * We are at the start of the buffer, and there
2464 * is more file to read backwards. Which means
2465 * we are in the middle of a line. Note that we
2466 * may get here even if *bp was a newline; that
2467 * just means we are at the exact end of the
2468 * previous line, rather than some spot in the
2471 * Save away what we have to be combined with
2472 * the data from the next read.
2474 strbuf_splice(&sb
, 0, 0, buf
, endp
- buf
);
2481 die("BUG: reverse reflog parser had leftover data");
2484 strbuf_release(&sb
);
2488 static int files_for_each_reflog_ent(struct ref_store
*ref_store
,
2489 const char *refname
,
2490 each_reflog_ent_fn fn
, void *cb_data
)
2492 struct files_ref_store
*refs
=
2493 files_downcast(ref_store
, REF_STORE_READ
,
2494 "for_each_reflog_ent");
2496 struct strbuf sb
= STRBUF_INIT
;
2499 files_reflog_path(refs
, &sb
, refname
);
2500 logfp
= fopen(sb
.buf
, "r");
2501 strbuf_release(&sb
);
2505 while (!ret
&& !strbuf_getwholeline(&sb
, logfp
, '\n'))
2506 ret
= show_one_reflog_ent(&sb
, fn
, cb_data
);
2508 strbuf_release(&sb
);
2512 struct files_reflog_iterator
{
2513 struct ref_iterator base
;
2515 struct ref_store
*ref_store
;
2516 struct dir_iterator
*dir_iterator
;
2517 struct object_id oid
;
2520 static int files_reflog_iterator_advance(struct ref_iterator
*ref_iterator
)
2522 struct files_reflog_iterator
*iter
=
2523 (struct files_reflog_iterator
*)ref_iterator
;
2524 struct dir_iterator
*diter
= iter
->dir_iterator
;
2527 while ((ok
= dir_iterator_advance(diter
)) == ITER_OK
) {
2530 if (!S_ISREG(diter
->st
.st_mode
))
2532 if (diter
->basename
[0] == '.')
2534 if (ends_with(diter
->basename
, ".lock"))
2537 if (refs_read_ref_full(iter
->ref_store
,
2538 diter
->relative_path
, 0,
2539 iter
->oid
.hash
, &flags
)) {
2540 error("bad ref for %s", diter
->path
.buf
);
2544 iter
->base
.refname
= diter
->relative_path
;
2545 iter
->base
.oid
= &iter
->oid
;
2546 iter
->base
.flags
= flags
;
2550 iter
->dir_iterator
= NULL
;
2551 if (ref_iterator_abort(ref_iterator
) == ITER_ERROR
)
2556 static int files_reflog_iterator_peel(struct ref_iterator
*ref_iterator
,
2557 struct object_id
*peeled
)
2559 die("BUG: ref_iterator_peel() called for reflog_iterator");
2562 static int files_reflog_iterator_abort(struct ref_iterator
*ref_iterator
)
2564 struct files_reflog_iterator
*iter
=
2565 (struct files_reflog_iterator
*)ref_iterator
;
2568 if (iter
->dir_iterator
)
2569 ok
= dir_iterator_abort(iter
->dir_iterator
);
2571 base_ref_iterator_free(ref_iterator
);
2575 static struct ref_iterator_vtable files_reflog_iterator_vtable
= {
2576 files_reflog_iterator_advance
,
2577 files_reflog_iterator_peel
,
2578 files_reflog_iterator_abort
2581 static struct ref_iterator
*files_reflog_iterator_begin(struct ref_store
*ref_store
)
2583 struct files_ref_store
*refs
=
2584 files_downcast(ref_store
, REF_STORE_READ
,
2585 "reflog_iterator_begin");
2586 struct files_reflog_iterator
*iter
= xcalloc(1, sizeof(*iter
));
2587 struct ref_iterator
*ref_iterator
= &iter
->base
;
2588 struct strbuf sb
= STRBUF_INIT
;
2590 base_ref_iterator_init(ref_iterator
, &files_reflog_iterator_vtable
);
2591 files_reflog_path(refs
, &sb
, NULL
);
2592 iter
->dir_iterator
= dir_iterator_begin(sb
.buf
);
2593 iter
->ref_store
= ref_store
;
2594 strbuf_release(&sb
);
2595 return ref_iterator
;
2599 * If update is a direct update of head_ref (the reference pointed to
2600 * by HEAD), then add an extra REF_LOG_ONLY update for HEAD.
2602 static int split_head_update(struct ref_update
*update
,
2603 struct ref_transaction
*transaction
,
2604 const char *head_ref
,
2605 struct string_list
*affected_refnames
,
2608 struct string_list_item
*item
;
2609 struct ref_update
*new_update
;
2611 if ((update
->flags
& REF_LOG_ONLY
) ||
2612 (update
->flags
& REF_ISPRUNING
) ||
2613 (update
->flags
& REF_UPDATE_VIA_HEAD
))
2616 if (strcmp(update
->refname
, head_ref
))
2620 * First make sure that HEAD is not already in the
2621 * transaction. This insertion is O(N) in the transaction
2622 * size, but it happens at most once per transaction.
2624 item
= string_list_insert(affected_refnames
, "HEAD");
2626 /* An entry already existed */
2628 "multiple updates for 'HEAD' (including one "
2629 "via its referent '%s') are not allowed",
2631 return TRANSACTION_NAME_CONFLICT
;
2634 new_update
= ref_transaction_add_update(
2635 transaction
, "HEAD",
2636 update
->flags
| REF_LOG_ONLY
| REF_NODEREF
,
2637 update
->new_oid
.hash
, update
->old_oid
.hash
,
2640 item
->util
= new_update
;
2646 * update is for a symref that points at referent and doesn't have
2647 * REF_NODEREF set. Split it into two updates:
2648 * - The original update, but with REF_LOG_ONLY and REF_NODEREF set
2649 * - A new, separate update for the referent reference
2650 * Note that the new update will itself be subject to splitting when
2651 * the iteration gets to it.
2653 static int split_symref_update(struct files_ref_store
*refs
,
2654 struct ref_update
*update
,
2655 const char *referent
,
2656 struct ref_transaction
*transaction
,
2657 struct string_list
*affected_refnames
,
2660 struct string_list_item
*item
;
2661 struct ref_update
*new_update
;
2662 unsigned int new_flags
;
2665 * First make sure that referent is not already in the
2666 * transaction. This insertion is O(N) in the transaction
2667 * size, but it happens at most once per symref in a
2670 item
= string_list_insert(affected_refnames
, referent
);
2672 /* An entry already existed */
2674 "multiple updates for '%s' (including one "
2675 "via symref '%s') are not allowed",
2676 referent
, update
->refname
);
2677 return TRANSACTION_NAME_CONFLICT
;
2680 new_flags
= update
->flags
;
2681 if (!strcmp(update
->refname
, "HEAD")) {
2683 * Record that the new update came via HEAD, so that
2684 * when we process it, split_head_update() doesn't try
2685 * to add another reflog update for HEAD. Note that
2686 * this bit will be propagated if the new_update
2687 * itself needs to be split.
2689 new_flags
|= REF_UPDATE_VIA_HEAD
;
2692 new_update
= ref_transaction_add_update(
2693 transaction
, referent
, new_flags
,
2694 update
->new_oid
.hash
, update
->old_oid
.hash
,
2697 new_update
->parent_update
= update
;
2700 * Change the symbolic ref update to log only. Also, it
2701 * doesn't need to check its old SHA-1 value, as that will be
2702 * done when new_update is processed.
2704 update
->flags
|= REF_LOG_ONLY
| REF_NODEREF
;
2705 update
->flags
&= ~REF_HAVE_OLD
;
2707 item
->util
= new_update
;
2713 * Return the refname under which update was originally requested.
2715 static const char *original_update_refname(struct ref_update
*update
)
2717 while (update
->parent_update
)
2718 update
= update
->parent_update
;
2720 return update
->refname
;
2724 * Check whether the REF_HAVE_OLD and old_oid values stored in update
2725 * are consistent with oid, which is the reference's current value. If
2726 * everything is OK, return 0; otherwise, write an error message to
2727 * err and return -1.
2729 static int check_old_oid(struct ref_update
*update
, struct object_id
*oid
,
2732 if (!(update
->flags
& REF_HAVE_OLD
) ||
2733 !oidcmp(oid
, &update
->old_oid
))
2736 if (is_null_oid(&update
->old_oid
))
2737 strbuf_addf(err
, "cannot lock ref '%s': "
2738 "reference already exists",
2739 original_update_refname(update
));
2740 else if (is_null_oid(oid
))
2741 strbuf_addf(err
, "cannot lock ref '%s': "
2742 "reference is missing but expected %s",
2743 original_update_refname(update
),
2744 oid_to_hex(&update
->old_oid
));
2746 strbuf_addf(err
, "cannot lock ref '%s': "
2747 "is at %s but expected %s",
2748 original_update_refname(update
),
2750 oid_to_hex(&update
->old_oid
));
2756 * Prepare for carrying out update:
2757 * - Lock the reference referred to by update.
2758 * - Read the reference under lock.
2759 * - Check that its old SHA-1 value (if specified) is correct, and in
2760 * any case record it in update->lock->old_oid for later use when
2761 * writing the reflog.
2762 * - If it is a symref update without REF_NODEREF, split it up into a
2763 * REF_LOG_ONLY update of the symref and add a separate update for
2764 * the referent to transaction.
2765 * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY
2768 static int lock_ref_for_update(struct files_ref_store
*refs
,
2769 struct ref_update
*update
,
2770 struct ref_transaction
*transaction
,
2771 const char *head_ref
,
2772 struct string_list
*affected_refnames
,
2775 struct strbuf referent
= STRBUF_INIT
;
2776 int mustexist
= (update
->flags
& REF_HAVE_OLD
) &&
2777 !is_null_oid(&update
->old_oid
);
2779 struct ref_lock
*lock
;
2781 files_assert_main_repository(refs
, "lock_ref_for_update");
2783 if ((update
->flags
& REF_HAVE_NEW
) && is_null_oid(&update
->new_oid
))
2784 update
->flags
|= REF_DELETING
;
2787 ret
= split_head_update(update
, transaction
, head_ref
,
2788 affected_refnames
, err
);
2793 ret
= lock_raw_ref(refs
, update
->refname
, mustexist
,
2794 affected_refnames
, NULL
,
2796 &update
->type
, err
);
2800 reason
= strbuf_detach(err
, NULL
);
2801 strbuf_addf(err
, "cannot lock ref '%s': %s",
2802 original_update_refname(update
), reason
);
2807 update
->backend_data
= lock
;
2809 if (update
->type
& REF_ISSYMREF
) {
2810 if (update
->flags
& REF_NODEREF
) {
2812 * We won't be reading the referent as part of
2813 * the transaction, so we have to read it here
2814 * to record and possibly check old_sha1:
2816 if (refs_read_ref_full(&refs
->base
,
2818 lock
->old_oid
.hash
, NULL
)) {
2819 if (update
->flags
& REF_HAVE_OLD
) {
2820 strbuf_addf(err
, "cannot lock ref '%s': "
2821 "error reading reference",
2822 original_update_refname(update
));
2825 } else if (check_old_oid(update
, &lock
->old_oid
, err
)) {
2826 return TRANSACTION_GENERIC_ERROR
;
2830 * Create a new update for the reference this
2831 * symref is pointing at. Also, we will record
2832 * and verify old_sha1 for this update as part
2833 * of processing the split-off update, so we
2834 * don't have to do it here.
2836 ret
= split_symref_update(refs
, update
,
2837 referent
.buf
, transaction
,
2838 affected_refnames
, err
);
2843 struct ref_update
*parent_update
;
2845 if (check_old_oid(update
, &lock
->old_oid
, err
))
2846 return TRANSACTION_GENERIC_ERROR
;
2849 * If this update is happening indirectly because of a
2850 * symref update, record the old SHA-1 in the parent
2853 for (parent_update
= update
->parent_update
;
2855 parent_update
= parent_update
->parent_update
) {
2856 struct ref_lock
*parent_lock
= parent_update
->backend_data
;
2857 oidcpy(&parent_lock
->old_oid
, &lock
->old_oid
);
2861 if ((update
->flags
& REF_HAVE_NEW
) &&
2862 !(update
->flags
& REF_DELETING
) &&
2863 !(update
->flags
& REF_LOG_ONLY
)) {
2864 if (!(update
->type
& REF_ISSYMREF
) &&
2865 !oidcmp(&lock
->old_oid
, &update
->new_oid
)) {
2867 * The reference already has the desired
2868 * value, so we don't need to write it.
2870 } else if (write_ref_to_lockfile(lock
, &update
->new_oid
,
2872 char *write_err
= strbuf_detach(err
, NULL
);
2875 * The lock was freed upon failure of
2876 * write_ref_to_lockfile():
2878 update
->backend_data
= NULL
;
2880 "cannot update ref '%s': %s",
2881 update
->refname
, write_err
);
2883 return TRANSACTION_GENERIC_ERROR
;
2885 update
->flags
|= REF_NEEDS_COMMIT
;
2888 if (!(update
->flags
& REF_NEEDS_COMMIT
)) {
2890 * We didn't call write_ref_to_lockfile(), so
2891 * the lockfile is still open. Close it to
2892 * free up the file descriptor:
2894 if (close_ref(lock
)) {
2895 strbuf_addf(err
, "couldn't close '%s.lock'",
2897 return TRANSACTION_GENERIC_ERROR
;
2904 * Unlock any references in `transaction` that are still locked, and
2905 * mark the transaction closed.
2907 static void files_transaction_cleanup(struct ref_transaction
*transaction
)
2911 for (i
= 0; i
< transaction
->nr
; i
++) {
2912 struct ref_update
*update
= transaction
->updates
[i
];
2913 struct ref_lock
*lock
= update
->backend_data
;
2917 update
->backend_data
= NULL
;
2921 transaction
->state
= REF_TRANSACTION_CLOSED
;
2924 static int files_transaction_prepare(struct ref_store
*ref_store
,
2925 struct ref_transaction
*transaction
,
2928 struct files_ref_store
*refs
=
2929 files_downcast(ref_store
, REF_STORE_WRITE
,
2930 "ref_transaction_prepare");
2933 struct string_list affected_refnames
= STRING_LIST_INIT_NODUP
;
2934 char *head_ref
= NULL
;
2936 struct object_id head_oid
;
2940 if (!transaction
->nr
)
2944 * Fail if a refname appears more than once in the
2945 * transaction. (If we end up splitting up any updates using
2946 * split_symref_update() or split_head_update(), those
2947 * functions will check that the new updates don't have the
2948 * same refname as any existing ones.)
2950 for (i
= 0; i
< transaction
->nr
; i
++) {
2951 struct ref_update
*update
= transaction
->updates
[i
];
2952 struct string_list_item
*item
=
2953 string_list_append(&affected_refnames
, update
->refname
);
2956 * We store a pointer to update in item->util, but at
2957 * the moment we never use the value of this field
2958 * except to check whether it is non-NULL.
2960 item
->util
= update
;
2962 string_list_sort(&affected_refnames
);
2963 if (ref_update_reject_duplicates(&affected_refnames
, err
)) {
2964 ret
= TRANSACTION_GENERIC_ERROR
;
2969 * Special hack: If a branch is updated directly and HEAD
2970 * points to it (may happen on the remote side of a push
2971 * for example) then logically the HEAD reflog should be
2974 * A generic solution would require reverse symref lookups,
2975 * but finding all symrefs pointing to a given branch would be
2976 * rather costly for this rare event (the direct update of a
2977 * branch) to be worth it. So let's cheat and check with HEAD
2978 * only, which should cover 99% of all usage scenarios (even
2979 * 100% of the default ones).
2981 * So if HEAD is a symbolic reference, then record the name of
2982 * the reference that it points to. If we see an update of
2983 * head_ref within the transaction, then split_head_update()
2984 * arranges for the reflog of HEAD to be updated, too.
2986 head_ref
= refs_resolve_refdup(ref_store
, "HEAD",
2987 RESOLVE_REF_NO_RECURSE
,
2988 head_oid
.hash
, &head_type
);
2990 if (head_ref
&& !(head_type
& REF_ISSYMREF
)) {
2996 * Acquire all locks, verify old values if provided, check
2997 * that new values are valid, and write new values to the
2998 * lockfiles, ready to be activated. Only keep one lockfile
2999 * open at a time to avoid running out of file descriptors.
3000 * Note that lock_ref_for_update() might append more updates
3001 * to the transaction.
3003 for (i
= 0; i
< transaction
->nr
; i
++) {
3004 struct ref_update
*update
= transaction
->updates
[i
];
3006 ret
= lock_ref_for_update(refs
, update
, transaction
,
3007 head_ref
, &affected_refnames
, err
);
3014 string_list_clear(&affected_refnames
, 0);
3017 files_transaction_cleanup(transaction
);
3019 transaction
->state
= REF_TRANSACTION_PREPARED
;
3024 static int files_transaction_finish(struct ref_store
*ref_store
,
3025 struct ref_transaction
*transaction
,
3028 struct files_ref_store
*refs
=
3029 files_downcast(ref_store
, 0, "ref_transaction_finish");
3032 struct string_list refs_to_delete
= STRING_LIST_INIT_NODUP
;
3033 struct string_list_item
*ref_to_delete
;
3034 struct strbuf sb
= STRBUF_INIT
;
3038 if (!transaction
->nr
) {
3039 transaction
->state
= REF_TRANSACTION_CLOSED
;
3043 /* Perform updates first so live commits remain referenced */
3044 for (i
= 0; i
< transaction
->nr
; i
++) {
3045 struct ref_update
*update
= transaction
->updates
[i
];
3046 struct ref_lock
*lock
= update
->backend_data
;
3048 if (update
->flags
& REF_NEEDS_COMMIT
||
3049 update
->flags
& REF_LOG_ONLY
) {
3050 if (files_log_ref_write(refs
,
3054 update
->msg
, update
->flags
,
3056 char *old_msg
= strbuf_detach(err
, NULL
);
3058 strbuf_addf(err
, "cannot update the ref '%s': %s",
3059 lock
->ref_name
, old_msg
);
3062 update
->backend_data
= NULL
;
3063 ret
= TRANSACTION_GENERIC_ERROR
;
3067 if (update
->flags
& REF_NEEDS_COMMIT
) {
3068 clear_loose_ref_cache(refs
);
3069 if (commit_ref(lock
)) {
3070 strbuf_addf(err
, "couldn't set '%s'", lock
->ref_name
);
3072 update
->backend_data
= NULL
;
3073 ret
= TRANSACTION_GENERIC_ERROR
;
3078 /* Perform deletes now that updates are safely completed */
3079 for (i
= 0; i
< transaction
->nr
; i
++) {
3080 struct ref_update
*update
= transaction
->updates
[i
];
3081 struct ref_lock
*lock
= update
->backend_data
;
3083 if (update
->flags
& REF_DELETING
&&
3084 !(update
->flags
& REF_LOG_ONLY
)) {
3085 if (!(update
->type
& REF_ISPACKED
) ||
3086 update
->type
& REF_ISSYMREF
) {
3087 /* It is a loose reference. */
3089 files_ref_path(refs
, &sb
, lock
->ref_name
);
3090 if (unlink_or_msg(sb
.buf
, err
)) {
3091 ret
= TRANSACTION_GENERIC_ERROR
;
3094 update
->flags
|= REF_DELETED_LOOSE
;
3097 if (!(update
->flags
& REF_ISPRUNING
))
3098 string_list_append(&refs_to_delete
,
3103 if (repack_without_refs(refs
, &refs_to_delete
, err
)) {
3104 ret
= TRANSACTION_GENERIC_ERROR
;
3108 /* Delete the reflogs of any references that were deleted: */
3109 for_each_string_list_item(ref_to_delete
, &refs_to_delete
) {
3111 files_reflog_path(refs
, &sb
, ref_to_delete
->string
);
3112 if (!unlink_or_warn(sb
.buf
))
3113 try_remove_empty_parents(refs
, ref_to_delete
->string
,
3114 REMOVE_EMPTY_PARENTS_REFLOG
);
3117 clear_loose_ref_cache(refs
);
3120 files_transaction_cleanup(transaction
);
3122 for (i
= 0; i
< transaction
->nr
; i
++) {
3123 struct ref_update
*update
= transaction
->updates
[i
];
3125 if (update
->flags
& REF_DELETED_LOOSE
) {
3127 * The loose reference was deleted. Delete any
3128 * empty parent directories. (Note that this
3129 * can only work because we have already
3130 * removed the lockfile.)
3132 try_remove_empty_parents(refs
, update
->refname
,
3133 REMOVE_EMPTY_PARENTS_REF
);
3137 strbuf_release(&sb
);
3138 string_list_clear(&refs_to_delete
, 0);
3142 static int files_transaction_abort(struct ref_store
*ref_store
,
3143 struct ref_transaction
*transaction
,
3146 files_transaction_cleanup(transaction
);
3150 static int ref_present(const char *refname
,
3151 const struct object_id
*oid
, int flags
, void *cb_data
)
3153 struct string_list
*affected_refnames
= cb_data
;
3155 return string_list_has_string(affected_refnames
, refname
);
3158 static int files_initial_transaction_commit(struct ref_store
*ref_store
,
3159 struct ref_transaction
*transaction
,
3162 struct files_ref_store
*refs
=
3163 files_downcast(ref_store
, REF_STORE_WRITE
,
3164 "initial_ref_transaction_commit");
3167 struct string_list affected_refnames
= STRING_LIST_INIT_NODUP
;
3171 if (transaction
->state
!= REF_TRANSACTION_OPEN
)
3172 die("BUG: commit called for transaction that is not open");
3174 /* Fail if a refname appears more than once in the transaction: */
3175 for (i
= 0; i
< transaction
->nr
; i
++)
3176 string_list_append(&affected_refnames
,
3177 transaction
->updates
[i
]->refname
);
3178 string_list_sort(&affected_refnames
);
3179 if (ref_update_reject_duplicates(&affected_refnames
, err
)) {
3180 ret
= TRANSACTION_GENERIC_ERROR
;
3185 * It's really undefined to call this function in an active
3186 * repository or when there are existing references: we are
3187 * only locking and changing packed-refs, so (1) any
3188 * simultaneous processes might try to change a reference at
3189 * the same time we do, and (2) any existing loose versions of
3190 * the references that we are setting would have precedence
3191 * over our values. But some remote helpers create the remote
3192 * "HEAD" and "master" branches before calling this function,
3193 * so here we really only check that none of the references
3194 * that we are creating already exists.
3196 if (refs_for_each_rawref(&refs
->base
, ref_present
,
3197 &affected_refnames
))
3198 die("BUG: initial ref transaction called with existing refs");
3200 for (i
= 0; i
< transaction
->nr
; i
++) {
3201 struct ref_update
*update
= transaction
->updates
[i
];
3203 if ((update
->flags
& REF_HAVE_OLD
) &&
3204 !is_null_oid(&update
->old_oid
))
3205 die("BUG: initial ref transaction with old_sha1 set");
3206 if (refs_verify_refname_available(&refs
->base
, update
->refname
,
3207 &affected_refnames
, NULL
,
3209 ret
= TRANSACTION_NAME_CONFLICT
;
3214 if (lock_packed_refs(refs
->packed_ref_store
, 0)) {
3215 strbuf_addf(err
, "unable to lock packed-refs file: %s",
3217 ret
= TRANSACTION_GENERIC_ERROR
;
3221 for (i
= 0; i
< transaction
->nr
; i
++) {
3222 struct ref_update
*update
= transaction
->updates
[i
];
3224 if ((update
->flags
& REF_HAVE_NEW
) &&
3225 !is_null_oid(&update
->new_oid
))
3226 add_packed_ref(refs
->packed_ref_store
, update
->refname
,
3230 if (commit_packed_refs(refs
)) {
3231 strbuf_addf(err
, "unable to commit packed-refs file: %s",
3233 ret
= TRANSACTION_GENERIC_ERROR
;
3238 transaction
->state
= REF_TRANSACTION_CLOSED
;
3239 string_list_clear(&affected_refnames
, 0);
3243 struct expire_reflog_cb
{
3245 reflog_expiry_should_prune_fn
*should_prune_fn
;
3248 struct object_id last_kept_oid
;
3251 static int expire_reflog_ent(struct object_id
*ooid
, struct object_id
*noid
,
3252 const char *email
, timestamp_t timestamp
, int tz
,
3253 const char *message
, void *cb_data
)
3255 struct expire_reflog_cb
*cb
= cb_data
;
3256 struct expire_reflog_policy_cb
*policy_cb
= cb
->policy_cb
;
3258 if (cb
->flags
& EXPIRE_REFLOGS_REWRITE
)
3259 ooid
= &cb
->last_kept_oid
;
3261 if ((*cb
->should_prune_fn
)(ooid
, noid
, email
, timestamp
, tz
,
3262 message
, policy_cb
)) {
3264 printf("would prune %s", message
);
3265 else if (cb
->flags
& EXPIRE_REFLOGS_VERBOSE
)
3266 printf("prune %s", message
);
3269 fprintf(cb
->newlog
, "%s %s %s %"PRItime
" %+05d\t%s",
3270 oid_to_hex(ooid
), oid_to_hex(noid
),
3271 email
, timestamp
, tz
, message
);
3272 oidcpy(&cb
->last_kept_oid
, noid
);
3274 if (cb
->flags
& EXPIRE_REFLOGS_VERBOSE
)
3275 printf("keep %s", message
);
3280 static int files_reflog_expire(struct ref_store
*ref_store
,
3281 const char *refname
, const unsigned char *sha1
,
3283 reflog_expiry_prepare_fn prepare_fn
,
3284 reflog_expiry_should_prune_fn should_prune_fn
,
3285 reflog_expiry_cleanup_fn cleanup_fn
,
3286 void *policy_cb_data
)
3288 struct files_ref_store
*refs
=
3289 files_downcast(ref_store
, REF_STORE_WRITE
, "reflog_expire");
3290 static struct lock_file reflog_lock
;
3291 struct expire_reflog_cb cb
;
3292 struct ref_lock
*lock
;
3293 struct strbuf log_file_sb
= STRBUF_INIT
;
3297 struct strbuf err
= STRBUF_INIT
;
3298 struct object_id oid
;
3300 memset(&cb
, 0, sizeof(cb
));
3302 cb
.policy_cb
= policy_cb_data
;
3303 cb
.should_prune_fn
= should_prune_fn
;
3306 * The reflog file is locked by holding the lock on the
3307 * reference itself, plus we might need to update the
3308 * reference if --updateref was specified:
3310 lock
= lock_ref_sha1_basic(refs
, refname
, sha1
,
3311 NULL
, NULL
, REF_NODEREF
,
3314 error("cannot lock ref '%s': %s", refname
, err
.buf
);
3315 strbuf_release(&err
);
3318 if (!refs_reflog_exists(ref_store
, refname
)) {
3323 files_reflog_path(refs
, &log_file_sb
, refname
);
3324 log_file
= strbuf_detach(&log_file_sb
, NULL
);
3325 if (!(flags
& EXPIRE_REFLOGS_DRY_RUN
)) {
3327 * Even though holding $GIT_DIR/logs/$reflog.lock has
3328 * no locking implications, we use the lock_file
3329 * machinery here anyway because it does a lot of the
3330 * work we need, including cleaning up if the program
3331 * exits unexpectedly.
3333 if (hold_lock_file_for_update(&reflog_lock
, log_file
, 0) < 0) {
3334 struct strbuf err
= STRBUF_INIT
;
3335 unable_to_lock_message(log_file
, errno
, &err
);
3336 error("%s", err
.buf
);
3337 strbuf_release(&err
);
3340 cb
.newlog
= fdopen_lock_file(&reflog_lock
, "w");
3342 error("cannot fdopen %s (%s)",
3343 get_lock_file_path(&reflog_lock
), strerror(errno
));
3348 hashcpy(oid
.hash
, sha1
);
3350 (*prepare_fn
)(refname
, &oid
, cb
.policy_cb
);
3351 refs_for_each_reflog_ent(ref_store
, refname
, expire_reflog_ent
, &cb
);
3352 (*cleanup_fn
)(cb
.policy_cb
);
3354 if (!(flags
& EXPIRE_REFLOGS_DRY_RUN
)) {
3356 * It doesn't make sense to adjust a reference pointed
3357 * to by a symbolic ref based on expiring entries in
3358 * the symbolic reference's reflog. Nor can we update
3359 * a reference if there are no remaining reflog
3362 int update
= (flags
& EXPIRE_REFLOGS_UPDATE_REF
) &&
3363 !(type
& REF_ISSYMREF
) &&
3364 !is_null_oid(&cb
.last_kept_oid
);
3366 if (close_lock_file(&reflog_lock
)) {
3367 status
|= error("couldn't write %s: %s", log_file
,
3369 } else if (update
&&
3370 (write_in_full(get_lock_file_fd(lock
->lk
),
3371 oid_to_hex(&cb
.last_kept_oid
), GIT_SHA1_HEXSZ
) != GIT_SHA1_HEXSZ
||
3372 write_str_in_full(get_lock_file_fd(lock
->lk
), "\n") != 1 ||
3373 close_ref(lock
) < 0)) {
3374 status
|= error("couldn't write %s",
3375 get_lock_file_path(lock
->lk
));
3376 rollback_lock_file(&reflog_lock
);
3377 } else if (commit_lock_file(&reflog_lock
)) {
3378 status
|= error("unable to write reflog '%s' (%s)",
3379 log_file
, strerror(errno
));
3380 } else if (update
&& commit_ref(lock
)) {
3381 status
|= error("couldn't set %s", lock
->ref_name
);
3389 rollback_lock_file(&reflog_lock
);
3395 static int files_init_db(struct ref_store
*ref_store
, struct strbuf
*err
)
3397 struct files_ref_store
*refs
=
3398 files_downcast(ref_store
, REF_STORE_WRITE
, "init_db");
3399 struct strbuf sb
= STRBUF_INIT
;
3402 * Create .git/refs/{heads,tags}
3404 files_ref_path(refs
, &sb
, "refs/heads");
3405 safe_create_dir(sb
.buf
, 1);
3408 files_ref_path(refs
, &sb
, "refs/tags");
3409 safe_create_dir(sb
.buf
, 1);
3411 strbuf_release(&sb
);
3415 struct ref_storage_be refs_be_files
= {
3418 files_ref_store_create
,
3420 files_transaction_prepare
,
3421 files_transaction_finish
,
3422 files_transaction_abort
,
3423 files_initial_transaction_commit
,
3427 files_create_symref
,
3431 files_ref_iterator_begin
,
3434 files_reflog_iterator_begin
,
3435 files_for_each_reflog_ent
,
3436 files_for_each_reflog_ent_reverse
,
3437 files_reflog_exists
,
3438 files_create_reflog
,
3439 files_delete_reflog
,