7 /* ISSYMREF=01 and ISPACKED=02 are public interfaces */
8 #define REF_KNOWS_PEELED 04
11 struct ref_list
*next
;
12 unsigned char flag
; /* ISSYMREF? ISPACKED? */
13 unsigned char sha1
[20];
14 unsigned char peeled
[20];
15 char name
[FLEX_ARRAY
];
18 static const char *parse_ref_line(char *line
, unsigned char *sha1
)
21 * 42: the answer to everything.
23 * In this case, it happens to be the answer to
24 * 40 (length of sha1 hex representation)
25 * +1 (space in between hex and name)
26 * +1 (newline at the end of the line)
28 int len
= strlen(line
) - 42;
32 if (get_sha1_hex(line
, sha1
) < 0)
34 if (!isspace(line
[40]))
39 if (line
[len
] != '\n')
46 static struct ref_list
*add_ref(const char *name
, const unsigned char *sha1
,
47 int flag
, struct ref_list
*list
,
48 struct ref_list
**new_entry
)
51 struct ref_list
*entry
;
53 /* Allocate it and add it in.. */
54 len
= strlen(name
) + 1;
55 entry
= xmalloc(sizeof(struct ref_list
) + len
);
56 hashcpy(entry
->sha1
, sha1
);
57 hashclr(entry
->peeled
);
58 memcpy(entry
->name
, name
, len
);
66 /* merge sort the ref list */
67 static struct ref_list
*sort_ref_list(struct ref_list
*list
)
69 int psize
, qsize
, last_merge_count
, cmp
;
70 struct ref_list
*p
, *q
, *l
, *e
;
71 struct ref_list
*new_list
= list
;
79 last_merge_count
= merge_count
;
92 while (psize
< k
&& q
->next
) {
98 while ((psize
> 0) || (qsize
> 0 && q
)) {
99 if (qsize
== 0 || !q
) {
103 } else if (psize
== 0) {
108 cmp
= strcmp(q
->name
, p
->name
);
113 } else if (cmp
> 0) {
118 if (hashcmp(q
->sha1
, p
->sha1
))
119 die("Duplicated ref, and SHA1s don't match: %s",
121 warning("Duplicated ref: %s", q
->name
);
145 } while ((last_merge_count
!= merge_count
) || (last_merge_count
!= 1));
151 * Future: need to be in "struct repository"
152 * when doing a full libification.
154 static struct cached_refs
{
157 struct ref_list
*loose
;
158 struct ref_list
*packed
;
160 static struct ref_list
*current_ref
;
162 static struct ref_list
*extra_refs
;
164 static void free_ref_list(struct ref_list
*list
)
166 struct ref_list
*next
;
167 for ( ; list
; list
= next
) {
173 static void invalidate_cached_refs(void)
175 struct cached_refs
*ca
= &cached_refs
;
177 if (ca
->did_loose
&& ca
->loose
)
178 free_ref_list(ca
->loose
);
179 if (ca
->did_packed
&& ca
->packed
)
180 free_ref_list(ca
->packed
);
181 ca
->loose
= ca
->packed
= NULL
;
182 ca
->did_loose
= ca
->did_packed
= 0;
185 static void read_packed_refs(FILE *f
, struct cached_refs
*cached_refs
)
187 struct ref_list
*list
= NULL
;
188 struct ref_list
*last
= NULL
;
189 char refline
[PATH_MAX
];
190 int flag
= REF_ISPACKED
;
192 while (fgets(refline
, sizeof(refline
), f
)) {
193 unsigned char sha1
[20];
195 static const char header
[] = "# pack-refs with:";
197 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
198 const char *traits
= refline
+ sizeof(header
) - 1;
199 if (strstr(traits
, " peeled "))
200 flag
|= REF_KNOWS_PEELED
;
201 /* perhaps other traits later as well */
205 name
= parse_ref_line(refline
, sha1
);
207 list
= add_ref(name
, sha1
, flag
, list
, &last
);
212 strlen(refline
) == 42 &&
213 refline
[41] == '\n' &&
214 !get_sha1_hex(refline
+ 1, sha1
))
215 hashcpy(last
->peeled
, sha1
);
217 cached_refs
->packed
= sort_ref_list(list
);
220 void add_extra_ref(const char *name
, const unsigned char *sha1
, int flag
)
222 extra_refs
= add_ref(name
, sha1
, flag
, extra_refs
, NULL
);
225 void clear_extra_refs(void)
227 free_ref_list(extra_refs
);
231 static struct ref_list
*get_packed_refs(void)
233 if (!cached_refs
.did_packed
) {
234 FILE *f
= fopen(git_path("packed-refs"), "r");
235 cached_refs
.packed
= NULL
;
237 read_packed_refs(f
, &cached_refs
);
240 cached_refs
.did_packed
= 1;
242 return cached_refs
.packed
;
245 static struct ref_list
*get_ref_dir(const char *base
, struct ref_list
*list
)
247 DIR *dir
= opendir(git_path("%s", base
));
251 int baselen
= strlen(base
);
252 char *ref
= xmalloc(baselen
+ 257);
254 memcpy(ref
, base
, baselen
);
255 if (baselen
&& base
[baselen
-1] != '/')
256 ref
[baselen
++] = '/';
258 while ((de
= readdir(dir
)) != NULL
) {
259 unsigned char sha1
[20];
264 if (de
->d_name
[0] == '.')
266 namelen
= strlen(de
->d_name
);
269 if (has_extension(de
->d_name
, ".lock"))
271 memcpy(ref
+ baselen
, de
->d_name
, namelen
+1);
272 if (stat(git_path("%s", ref
), &st
) < 0)
274 if (S_ISDIR(st
.st_mode
)) {
275 list
= get_ref_dir(ref
, list
);
278 if (!resolve_ref(ref
, sha1
, 1, &flag
))
280 list
= add_ref(ref
, sha1
, flag
, list
, NULL
);
285 return sort_ref_list(list
);
288 struct warn_if_dangling_data
{
294 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
295 int flags
, void *cb_data
)
297 struct warn_if_dangling_data
*d
= cb_data
;
298 const char *resolves_to
;
299 unsigned char junk
[20];
301 if (!(flags
& REF_ISSYMREF
))
304 resolves_to
= resolve_ref(refname
, junk
, 0, NULL
);
305 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
308 fprintf(d
->fp
, d
->msg_fmt
, refname
);
312 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
314 struct warn_if_dangling_data data
= { fp
, refname
, msg_fmt
};
315 for_each_rawref(warn_if_dangling_symref
, &data
);
318 static struct ref_list
*get_loose_refs(void)
320 if (!cached_refs
.did_loose
) {
321 cached_refs
.loose
= get_ref_dir("refs", NULL
);
322 cached_refs
.did_loose
= 1;
324 return cached_refs
.loose
;
327 /* We allow "recursive" symbolic refs. Only within reason, though */
329 #define MAXREFLEN (1024)
331 static int resolve_gitlink_packed_ref(char *name
, int pathlen
, const char *refname
, unsigned char *result
)
334 struct cached_refs refs
;
335 struct ref_list
*ref
;
338 strcpy(name
+ pathlen
, "packed-refs");
339 f
= fopen(name
, "r");
342 read_packed_refs(f
, &refs
);
347 if (!strcmp(ref
->name
, refname
)) {
349 memcpy(result
, ref
->sha1
, 20);
354 free_ref_list(refs
.packed
);
358 static int resolve_gitlink_ref_recursive(char *name
, int pathlen
, const char *refname
, unsigned char *result
, int recursion
)
360 int fd
, len
= strlen(refname
);
361 char buffer
[128], *p
;
363 if (recursion
> MAXDEPTH
|| len
> MAXREFLEN
)
365 memcpy(name
+ pathlen
, refname
, len
+1);
366 fd
= open(name
, O_RDONLY
);
368 return resolve_gitlink_packed_ref(name
, pathlen
, refname
, result
);
370 len
= read(fd
, buffer
, sizeof(buffer
)-1);
374 while (len
&& isspace(buffer
[len
-1]))
378 /* Was it a detached head or an old-fashioned symlink? */
379 if (!get_sha1_hex(buffer
, result
))
383 if (strncmp(buffer
, "ref:", 4))
389 return resolve_gitlink_ref_recursive(name
, pathlen
, p
, result
, recursion
+1);
392 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *result
)
394 int len
= strlen(path
), retval
;
398 while (len
&& path
[len
-1] == '/')
402 gitdir
= xmalloc(len
+ MAXREFLEN
+ 8);
403 memcpy(gitdir
, path
, len
);
404 memcpy(gitdir
+ len
, "/.git", 6);
407 tmp
= read_gitfile_gently(gitdir
);
411 gitdir
= xmalloc(len
+ MAXREFLEN
+ 3);
412 memcpy(gitdir
, tmp
, len
);
415 gitdir
[++len
] = '\0';
416 retval
= resolve_gitlink_ref_recursive(gitdir
, len
, refname
, result
, 0);
422 * If the "reading" argument is set, this function finds out what _object_
423 * the ref points at by "reading" the ref. The ref, if it is not symbolic,
424 * has to exist, and if it is symbolic, it has to point at an existing ref,
425 * because the "read" goes through the symref to the ref it points at.
427 * The access that is not "reading" may often be "writing", but does not
428 * have to; it can be merely checking _where it leads to_. If it is a
429 * prelude to "writing" to the ref, a write to a symref that points at
430 * yet-to-be-born ref will create the real ref pointed by the symref.
431 * reading=0 allows the caller to check where such a symref leads to.
433 const char *resolve_ref(const char *ref
, unsigned char *sha1
, int reading
, int *flag
)
435 int depth
= MAXDEPTH
;
438 static char ref_buffer
[256];
452 git_snpath(path
, sizeof(path
), "%s", ref
);
453 /* Special case: non-existing file. */
454 if (lstat(path
, &st
) < 0) {
455 struct ref_list
*list
= get_packed_refs();
457 if (!strcmp(ref
, list
->name
)) {
458 hashcpy(sha1
, list
->sha1
);
460 *flag
|= REF_ISPACKED
;
465 if (reading
|| errno
!= ENOENT
)
471 /* Follow "normalized" - ie "refs/.." symlinks by hand */
472 if (S_ISLNK(st
.st_mode
)) {
473 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
474 if (len
>= 5 && !memcmp("refs/", buffer
, 5)) {
476 strcpy(ref_buffer
, buffer
);
479 *flag
|= REF_ISSYMREF
;
484 /* Is it a directory? */
485 if (S_ISDIR(st
.st_mode
)) {
491 * Anything else, just open it and try to use it as
494 fd
= open(path
, O_RDONLY
);
497 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
501 * Is it a symbolic ref?
503 if (len
< 4 || memcmp("ref:", buffer
, 4))
507 while (len
&& isspace(*buf
))
509 while (len
&& isspace(buf
[len
-1]))
512 memcpy(ref_buffer
, buf
, len
+ 1);
515 *flag
|= REF_ISSYMREF
;
517 if (len
< 40 || get_sha1_hex(buffer
, sha1
))
522 int read_ref(const char *ref
, unsigned char *sha1
)
524 if (resolve_ref(ref
, sha1
, 1, NULL
))
529 #define DO_FOR_EACH_INCLUDE_BROKEN 01
530 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
531 int flags
, void *cb_data
, struct ref_list
*entry
)
533 if (strncmp(base
, entry
->name
, trim
))
535 /* Is this a "negative ref" that represents a deleted ref? */
536 if (is_null_sha1(entry
->sha1
))
538 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
539 if (!has_sha1_file(entry
->sha1
)) {
540 error("%s does not point to a valid object!", entry
->name
);
545 return fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
548 int peel_ref(const char *ref
, unsigned char *sha1
)
551 unsigned char base
[20];
554 if (current_ref
&& (current_ref
->name
== ref
555 || !strcmp(current_ref
->name
, ref
))) {
556 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
557 hashcpy(sha1
, current_ref
->peeled
);
560 hashcpy(base
, current_ref
->sha1
);
564 if (!resolve_ref(ref
, base
, 1, &flag
))
567 if ((flag
& REF_ISPACKED
)) {
568 struct ref_list
*list
= get_packed_refs();
571 if (!strcmp(list
->name
, ref
)) {
572 if (list
->flag
& REF_KNOWS_PEELED
) {
573 hashcpy(sha1
, list
->peeled
);
576 /* older pack-refs did not leave peeled ones */
584 o
= parse_object(base
);
585 if (o
&& o
->type
== OBJ_TAG
) {
586 o
= deref_tag(o
, ref
, 0);
588 hashcpy(sha1
, o
->sha1
);
595 static int do_for_each_ref(const char *base
, each_ref_fn fn
, int trim
,
596 int flags
, void *cb_data
)
599 struct ref_list
*packed
= get_packed_refs();
600 struct ref_list
*loose
= get_loose_refs();
602 struct ref_list
*extra
;
604 for (extra
= extra_refs
; extra
; extra
= extra
->next
)
605 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, extra
);
607 while (packed
&& loose
) {
608 struct ref_list
*entry
;
609 int cmp
= strcmp(packed
->name
, loose
->name
);
611 packed
= packed
->next
;
619 packed
= packed
->next
;
621 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, entry
);
626 for (packed
= packed
? packed
: loose
; packed
; packed
= packed
->next
) {
627 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, packed
);
637 int head_ref(each_ref_fn fn
, void *cb_data
)
639 unsigned char sha1
[20];
642 if (resolve_ref("HEAD", sha1
, 1, &flag
))
643 return fn("HEAD", sha1
, flag
, cb_data
);
647 int for_each_ref(each_ref_fn fn
, void *cb_data
)
649 return do_for_each_ref("refs/", fn
, 0, 0, cb_data
);
652 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
654 return do_for_each_ref(prefix
, fn
, strlen(prefix
), 0, cb_data
);
657 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
659 return for_each_ref_in("refs/tags/", fn
, cb_data
);
662 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
664 return for_each_ref_in("refs/heads/", fn
, cb_data
);
667 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
669 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
672 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
674 return do_for_each_ref("refs/replace/", fn
, 13, 0, cb_data
);
677 int for_each_namespace_ref(each_ref_fn fn
, const char *ns_name
, void *cb_data
)
679 struct strbuf real_prefix
= STRBUF_INIT
;
682 if (prefixcmp(ns_name
, "refs/"))
683 strbuf_addstr(&real_prefix
, "refs/");
684 strbuf_addstr(&real_prefix
, ns_name
);
685 if (real_prefix
.buf
[real_prefix
.len
- 1] != '/')
686 strbuf_addch(&real_prefix
, '/');
688 ret
= for_each_ref_in(real_prefix
.buf
, fn
, cb_data
);
689 strbuf_release(&real_prefix
);
693 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
695 return do_for_each_ref("refs/", fn
, 0,
696 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
700 * Make sure "ref" is something reasonable to have under ".git/refs/";
701 * We do not like it if:
703 * - any path component of it begins with ".", or
704 * - it has double dots "..", or
705 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
706 * - it ends with a "/".
707 * - it ends with ".lock"
708 * - it contains a "\" (backslash)
711 static inline int bad_ref_char(int ch
)
713 if (((unsigned) ch
) <= ' ' ||
714 ch
== '~' || ch
== '^' || ch
== ':' || ch
== '\\')
716 /* 2.13 Pattern Matching Notation */
717 if (ch
== '?' || ch
== '[') /* Unsupported */
719 if (ch
== '*') /* Supported at the end */
724 int check_ref_format(const char *ref
)
726 int ch
, level
, bad_type
, last
;
727 int ret
= CHECK_REF_FORMAT_OK
;
728 const char *cp
= ref
;
732 while ((ch
= *cp
++) == '/')
733 ; /* tolerate duplicated slashes */
735 /* should not end with slashes */
736 return CHECK_REF_FORMAT_ERROR
;
738 /* we are at the beginning of the path component */
740 return CHECK_REF_FORMAT_ERROR
;
741 bad_type
= bad_ref_char(ch
);
743 if (bad_type
== 2 && (!*cp
|| *cp
== '/') &&
744 ret
== CHECK_REF_FORMAT_OK
)
745 ret
= CHECK_REF_FORMAT_WILDCARD
;
747 return CHECK_REF_FORMAT_ERROR
;
751 /* scan the rest of the path component */
752 while ((ch
= *cp
++) != 0) {
753 bad_type
= bad_ref_char(ch
);
755 return CHECK_REF_FORMAT_ERROR
;
758 if (last
== '.' && ch
== '.')
759 return CHECK_REF_FORMAT_ERROR
;
760 if (last
== '@' && ch
== '{')
761 return CHECK_REF_FORMAT_ERROR
;
766 if (ref
<= cp
- 2 && cp
[-2] == '.')
767 return CHECK_REF_FORMAT_ERROR
;
769 return CHECK_REF_FORMAT_ONELEVEL
;
770 if (has_extension(ref
, ".lock"))
771 return CHECK_REF_FORMAT_ERROR
;
777 const char *prettify_refname(const char *name
)
780 !prefixcmp(name
, "refs/heads/") ? 11 :
781 !prefixcmp(name
, "refs/tags/") ? 10 :
782 !prefixcmp(name
, "refs/remotes/") ? 13 :
786 const char *ref_rev_parse_rules
[] = {
792 "refs/remotes/%.*s/HEAD",
796 const char *ref_fetch_rules
[] = {
803 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
806 const int abbrev_name_len
= strlen(abbrev_name
);
808 for (p
= rules
; *p
; p
++) {
809 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
817 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
818 const unsigned char *old_sha1
, int mustexist
)
820 if (!resolve_ref(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
821 error("Can't verify ref %s", lock
->ref_name
);
825 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
826 error("Ref %s is at %s but expected %s", lock
->ref_name
,
827 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
834 static int remove_empty_directories(const char *file
)
836 /* we want to create a file but there is a directory there;
837 * if that is an empty directory (or a directory that contains
838 * only empty directories), remove them.
843 strbuf_init(&path
, 20);
844 strbuf_addstr(&path
, file
);
846 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
848 strbuf_release(&path
);
853 static int is_refname_available(const char *ref
, const char *oldref
,
854 struct ref_list
*list
, int quiet
)
856 int namlen
= strlen(ref
); /* e.g. 'foo/bar' */
858 /* list->name could be 'foo' or 'foo/bar/baz' */
859 if (!oldref
|| strcmp(oldref
, list
->name
)) {
860 int len
= strlen(list
->name
);
861 int cmplen
= (namlen
< len
) ? namlen
: len
;
862 const char *lead
= (namlen
< len
) ? list
->name
: ref
;
863 if (!strncmp(ref
, list
->name
, cmplen
) &&
864 lead
[cmplen
] == '/') {
866 error("'%s' exists; cannot create '%s'",
876 static struct ref_lock
*lock_ref_sha1_basic(const char *ref
, const unsigned char *old_sha1
, int flags
, int *type_p
)
879 const char *orig_ref
= ref
;
880 struct ref_lock
*lock
;
883 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
886 lock
= xcalloc(1, sizeof(struct ref_lock
));
889 ref
= resolve_ref(ref
, lock
->old_sha1
, mustexist
, &type
);
890 if (!ref
&& errno
== EISDIR
) {
891 /* we are trying to lock foo but we used to
892 * have foo/bar which now does not exist;
893 * it is normal for the empty directory 'foo'
896 ref_file
= git_path("%s", orig_ref
);
897 if (remove_empty_directories(ref_file
)) {
899 error("there are still refs under '%s'", orig_ref
);
902 ref
= resolve_ref(orig_ref
, lock
->old_sha1
, mustexist
, &type
);
908 error("unable to resolve reference %s: %s",
909 orig_ref
, strerror(errno
));
912 missing
= is_null_sha1(lock
->old_sha1
);
913 /* When the ref did not exist and we are creating it,
914 * make sure there is no existing ref that is packed
915 * whose name begins with our refname, nor a ref whose
916 * name is a proper prefix of our refname.
919 !is_refname_available(ref
, NULL
, get_packed_refs(), 0)) {
920 last_errno
= ENOTDIR
;
924 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
926 lflags
= LOCK_DIE_ON_ERROR
;
927 if (flags
& REF_NODEREF
) {
929 lflags
|= LOCK_NODEREF
;
931 lock
->ref_name
= xstrdup(ref
);
932 lock
->orig_ref_name
= xstrdup(orig_ref
);
933 ref_file
= git_path("%s", ref
);
935 lock
->force_write
= 1;
936 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
937 lock
->force_write
= 1;
939 if (safe_create_leading_directories(ref_file
)) {
941 error("unable to create directory for %s", ref_file
);
945 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
946 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
954 struct ref_lock
*lock_ref_sha1(const char *ref
, const unsigned char *old_sha1
)
956 char refpath
[PATH_MAX
];
957 if (check_ref_format(ref
))
959 strcpy(refpath
, mkpath("refs/%s", ref
));
960 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
963 struct ref_lock
*lock_any_ref_for_update(const char *ref
, const unsigned char *old_sha1
, int flags
)
965 switch (check_ref_format(ref
)) {
969 case CHECK_REF_FORMAT_ONELEVEL
:
970 return lock_ref_sha1_basic(ref
, old_sha1
, flags
, NULL
);
974 static struct lock_file packlock
;
976 static int repack_without_ref(const char *refname
)
978 struct ref_list
*list
, *packed_ref_list
;
982 packed_ref_list
= get_packed_refs();
983 for (list
= packed_ref_list
; list
; list
= list
->next
) {
984 if (!strcmp(refname
, list
->name
)) {
991 fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
993 unable_to_lock_error(git_path("packed-refs"), errno
);
994 return error("cannot delete '%s' from packed refs", refname
);
997 for (list
= packed_ref_list
; list
; list
= list
->next
) {
998 char line
[PATH_MAX
+ 100];
1001 if (!strcmp(refname
, list
->name
))
1003 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1004 sha1_to_hex(list
->sha1
), list
->name
);
1005 /* this should not happen but just being defensive */
1006 if (len
> sizeof(line
))
1007 die("too long a refname '%s'", list
->name
);
1008 write_or_die(fd
, line
, len
);
1010 return commit_lock_file(&packlock
);
1013 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1015 struct ref_lock
*lock
;
1016 int err
, i
= 0, ret
= 0, flag
= 0;
1018 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1021 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1025 if (!(delopt
& REF_NODEREF
)) {
1026 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1027 lock
->lk
->filename
[i
] = 0;
1028 path
= lock
->lk
->filename
;
1030 path
= git_path("%s", refname
);
1032 err
= unlink_or_warn(path
);
1033 if (err
&& errno
!= ENOENT
)
1036 if (!(delopt
& REF_NODEREF
))
1037 lock
->lk
->filename
[i
] = '.';
1039 /* removing the loose one could have resurrected an earlier
1040 * packed one. Also, if it was not loose we need to repack
1043 ret
|= repack_without_ref(refname
);
1045 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1046 invalidate_cached_refs();
1051 int rename_ref(const char *oldref
, const char *newref
, const char *logmsg
)
1053 static const char renamed_ref
[] = "RENAMED-REF";
1054 unsigned char sha1
[20], orig_sha1
[20];
1055 int flag
= 0, logmoved
= 0;
1056 struct ref_lock
*lock
;
1057 struct stat loginfo
;
1058 int log
= !lstat(git_path("logs/%s", oldref
), &loginfo
);
1059 const char *symref
= NULL
;
1061 if (log
&& S_ISLNK(loginfo
.st_mode
))
1062 return error("reflog for %s is a symlink", oldref
);
1064 symref
= resolve_ref(oldref
, orig_sha1
, 1, &flag
);
1065 if (flag
& REF_ISSYMREF
)
1066 return error("refname %s is a symbolic ref, renaming it is not supported",
1069 return error("refname %s not found", oldref
);
1071 if (!is_refname_available(newref
, oldref
, get_packed_refs(), 0))
1074 if (!is_refname_available(newref
, oldref
, get_loose_refs(), 0))
1077 lock
= lock_ref_sha1_basic(renamed_ref
, NULL
, 0, NULL
);
1079 return error("unable to lock %s", renamed_ref
);
1080 lock
->force_write
= 1;
1081 if (write_ref_sha1(lock
, orig_sha1
, logmsg
))
1082 return error("unable to save current sha1 in %s", renamed_ref
);
1084 if (log
&& rename(git_path("logs/%s", oldref
), git_path("tmp-renamed-log")))
1085 return error("unable to move logfile logs/%s to tmp-renamed-log: %s",
1086 oldref
, strerror(errno
));
1088 if (delete_ref(oldref
, orig_sha1
, REF_NODEREF
)) {
1089 error("unable to delete old %s", oldref
);
1093 if (resolve_ref(newref
, sha1
, 1, &flag
) && delete_ref(newref
, sha1
, REF_NODEREF
)) {
1094 if (errno
==EISDIR
) {
1095 if (remove_empty_directories(git_path("%s", newref
))) {
1096 error("Directory not empty: %s", newref
);
1100 error("unable to delete existing %s", newref
);
1105 if (log
&& safe_create_leading_directories(git_path("logs/%s", newref
))) {
1106 error("unable to create directory for %s", newref
);
1111 if (log
&& rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref
))) {
1112 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1114 * rename(a, b) when b is an existing
1115 * directory ought to result in ISDIR, but
1116 * Solaris 5.8 gives ENOTDIR. Sheesh.
1118 if (remove_empty_directories(git_path("logs/%s", newref
))) {
1119 error("Directory not empty: logs/%s", newref
);
1124 error("unable to move logfile tmp-renamed-log to logs/%s: %s",
1125 newref
, strerror(errno
));
1131 lock
= lock_ref_sha1_basic(newref
, NULL
, 0, NULL
);
1133 error("unable to lock %s for update", newref
);
1136 lock
->force_write
= 1;
1137 hashcpy(lock
->old_sha1
, orig_sha1
);
1138 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1139 error("unable to write current sha1 into %s", newref
);
1146 lock
= lock_ref_sha1_basic(oldref
, NULL
, 0, NULL
);
1148 error("unable to lock %s for rollback", oldref
);
1152 lock
->force_write
= 1;
1153 flag
= log_all_ref_updates
;
1154 log_all_ref_updates
= 0;
1155 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1156 error("unable to write current sha1 into %s", oldref
);
1157 log_all_ref_updates
= flag
;
1160 if (logmoved
&& rename(git_path("logs/%s", newref
), git_path("logs/%s", oldref
)))
1161 error("unable to restore logfile %s from %s: %s",
1162 oldref
, newref
, strerror(errno
));
1163 if (!logmoved
&& log
&&
1164 rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref
)))
1165 error("unable to restore logfile %s from tmp-renamed-log: %s",
1166 oldref
, strerror(errno
));
1171 int close_ref(struct ref_lock
*lock
)
1173 if (close_lock_file(lock
->lk
))
1179 int commit_ref(struct ref_lock
*lock
)
1181 if (commit_lock_file(lock
->lk
))
1187 void unlock_ref(struct ref_lock
*lock
)
1189 /* Do not free lock->lk -- atexit() still looks at them */
1191 rollback_lock_file(lock
->lk
);
1192 free(lock
->ref_name
);
1193 free(lock
->orig_ref_name
);
1198 * copy the reflog message msg to buf, which has been allocated sufficiently
1199 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1200 * because reflog file is one line per entry.
1202 static int copy_msg(char *buf
, const char *msg
)
1209 while ((c
= *msg
++)) {
1210 if (wasspace
&& isspace(c
))
1212 wasspace
= isspace(c
);
1217 while (buf
< cp
&& isspace(cp
[-1]))
1223 static int log_ref_write(const char *ref_name
, const unsigned char *old_sha1
,
1224 const unsigned char *new_sha1
, const char *msg
)
1226 int logfd
, written
, oflags
= O_APPEND
| O_WRONLY
;
1227 unsigned maxlen
, len
;
1229 char log_file
[PATH_MAX
];
1231 const char *committer
;
1233 if (log_all_ref_updates
< 0)
1234 log_all_ref_updates
= !is_bare_repository();
1236 git_snpath(log_file
, sizeof(log_file
), "logs/%s", ref_name
);
1238 if (log_all_ref_updates
&&
1239 (!prefixcmp(ref_name
, "refs/heads/") ||
1240 !prefixcmp(ref_name
, "refs/remotes/") ||
1241 !strcmp(ref_name
, "HEAD"))) {
1242 if (safe_create_leading_directories(log_file
) < 0)
1243 return error("unable to create directory for %s",
1248 logfd
= open(log_file
, oflags
, 0666);
1250 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1253 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1254 if (remove_empty_directories(log_file
)) {
1255 return error("There are still logs under '%s'",
1258 logfd
= open(log_file
, oflags
, 0666);
1262 return error("Unable to append to %s: %s",
1263 log_file
, strerror(errno
));
1266 adjust_shared_perm(log_file
);
1268 msglen
= msg
? strlen(msg
) : 0;
1269 committer
= git_committer_info(0);
1270 maxlen
= strlen(committer
) + msglen
+ 100;
1271 logrec
= xmalloc(maxlen
);
1272 len
= sprintf(logrec
, "%s %s %s\n",
1273 sha1_to_hex(old_sha1
),
1274 sha1_to_hex(new_sha1
),
1277 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1278 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1280 if (close(logfd
) != 0 || written
!= len
)
1281 return error("Unable to append to %s", log_file
);
1285 static int is_branch(const char *refname
)
1287 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1290 int write_ref_sha1(struct ref_lock
*lock
,
1291 const unsigned char *sha1
, const char *logmsg
)
1293 static char term
= '\n';
1298 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1302 o
= parse_object(sha1
);
1304 error("Trying to write ref %s with nonexistant object %s",
1305 lock
->ref_name
, sha1_to_hex(sha1
));
1309 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1310 error("Trying to write non-commit object %s to branch %s",
1311 sha1_to_hex(sha1
), lock
->ref_name
);
1315 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1316 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1317 || close_ref(lock
) < 0) {
1318 error("Couldn't write %s", lock
->lk
->filename
);
1322 invalidate_cached_refs();
1323 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1324 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1325 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1329 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1331 * Special hack: If a branch is updated directly and HEAD
1332 * points to it (may happen on the remote side of a push
1333 * for example) then logically the HEAD reflog should be
1335 * A generic solution implies reverse symref information,
1336 * but finding all symrefs pointing to the given branch
1337 * would be rather costly for this rare event (the direct
1338 * update of a branch) to be worth it. So let's cheat and
1339 * check with HEAD only which should cover 99% of all usage
1340 * scenarios (even 100% of the default ones).
1342 unsigned char head_sha1
[20];
1344 const char *head_ref
;
1345 head_ref
= resolve_ref("HEAD", head_sha1
, 1, &head_flag
);
1346 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1347 !strcmp(head_ref
, lock
->ref_name
))
1348 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1350 if (commit_ref(lock
)) {
1351 error("Couldn't set %s", lock
->ref_name
);
1359 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1362 const char *lockpath
;
1364 int fd
, len
, written
;
1365 char *git_HEAD
= git_pathdup("%s", ref_target
);
1366 unsigned char old_sha1
[20], new_sha1
[20];
1368 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1371 if (safe_create_leading_directories(git_HEAD
) < 0)
1372 return error("unable to create directory for %s", git_HEAD
);
1374 #ifndef NO_SYMLINK_HEAD
1375 if (prefer_symlink_refs
) {
1377 if (!symlink(refs_heads_master
, git_HEAD
))
1379 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1383 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1384 if (sizeof(ref
) <= len
) {
1385 error("refname too long: %s", refs_heads_master
);
1386 goto error_free_return
;
1388 lockpath
= mkpath("%s.lock", git_HEAD
);
1389 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1391 error("Unable to open %s for writing", lockpath
);
1392 goto error_free_return
;
1394 written
= write_in_full(fd
, ref
, len
);
1395 if (close(fd
) != 0 || written
!= len
) {
1396 error("Unable to write to %s", lockpath
);
1397 goto error_unlink_return
;
1399 if (rename(lockpath
, git_HEAD
) < 0) {
1400 error("Unable to create %s", git_HEAD
);
1401 goto error_unlink_return
;
1403 if (adjust_shared_perm(git_HEAD
)) {
1404 error("Unable to fix permissions on %s", lockpath
);
1405 error_unlink_return
:
1406 unlink_or_warn(lockpath
);
1412 #ifndef NO_SYMLINK_HEAD
1415 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1416 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1422 static char *ref_msg(const char *line
, const char *endp
)
1426 ep
= memchr(line
, '\n', endp
- line
);
1429 return xmemdupz(line
, ep
- line
);
1432 int read_ref_at(const char *ref
, unsigned long at_time
, int cnt
, unsigned char *sha1
, char **msg
, unsigned long *cutoff_time
, int *cutoff_tz
, int *cutoff_cnt
)
1434 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1436 int logfd
, tz
, reccnt
= 0;
1439 unsigned char logged_sha1
[20];
1443 logfile
= git_path("logs/%s", ref
);
1444 logfd
= open(logfile
, O_RDONLY
, 0);
1446 die_errno("Unable to read log '%s'", logfile
);
1449 die("Log %s is empty.", logfile
);
1450 mapsz
= xsize_t(st
.st_size
);
1451 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1452 logdata
= log_mapped
;
1456 rec
= logend
= logdata
+ st
.st_size
;
1457 while (logdata
< rec
) {
1459 if (logdata
< rec
&& *(rec
-1) == '\n')
1462 while (logdata
< rec
&& *(rec
-1) != '\n') {
1468 die("Log %s is corrupt.", logfile
);
1469 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1470 if (date
<= at_time
|| cnt
== 0) {
1471 tz
= strtoul(tz_c
, NULL
, 10);
1473 *msg
= ref_msg(rec
, logend
);
1475 *cutoff_time
= date
;
1479 *cutoff_cnt
= reccnt
- 1;
1481 if (get_sha1_hex(lastrec
, logged_sha1
))
1482 die("Log %s is corrupt.", logfile
);
1483 if (get_sha1_hex(rec
+ 41, sha1
))
1484 die("Log %s is corrupt.", logfile
);
1485 if (hashcmp(logged_sha1
, sha1
)) {
1486 warning("Log %s has gap after %s.",
1487 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1490 else if (date
== at_time
) {
1491 if (get_sha1_hex(rec
+ 41, sha1
))
1492 die("Log %s is corrupt.", logfile
);
1495 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1496 die("Log %s is corrupt.", logfile
);
1497 if (hashcmp(logged_sha1
, sha1
)) {
1498 warning("Log %s unexpectedly ended on %s.",
1499 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1502 munmap(log_mapped
, mapsz
);
1511 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1513 if (rec
== logend
|| *rec
== '\n')
1514 die("Log %s is corrupt.", logfile
);
1515 date
= strtoul(rec
+ 1, &tz_c
, 10);
1516 tz
= strtoul(tz_c
, NULL
, 10);
1517 if (get_sha1_hex(logdata
, sha1
))
1518 die("Log %s is corrupt.", logfile
);
1519 if (is_null_sha1(sha1
)) {
1520 if (get_sha1_hex(logdata
+ 41, sha1
))
1521 die("Log %s is corrupt.", logfile
);
1524 *msg
= ref_msg(logdata
, logend
);
1525 munmap(log_mapped
, mapsz
);
1528 *cutoff_time
= date
;
1532 *cutoff_cnt
= reccnt
;
1536 int for_each_recent_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1538 const char *logfile
;
1543 logfile
= git_path("logs/%s", ref
);
1544 logfp
= fopen(logfile
, "r");
1549 struct stat statbuf
;
1550 if (fstat(fileno(logfp
), &statbuf
) ||
1551 statbuf
.st_size
< ofs
||
1552 fseek(logfp
, -ofs
, SEEK_END
) ||
1553 fgets(buf
, sizeof(buf
), logfp
)) {
1559 while (fgets(buf
, sizeof(buf
), logfp
)) {
1560 unsigned char osha1
[20], nsha1
[20];
1561 char *email_end
, *message
;
1562 unsigned long timestamp
;
1565 /* old SP new SP name <email> SP time TAB msg LF */
1567 if (len
< 83 || buf
[len
-1] != '\n' ||
1568 get_sha1_hex(buf
, osha1
) || buf
[40] != ' ' ||
1569 get_sha1_hex(buf
+ 41, nsha1
) || buf
[81] != ' ' ||
1570 !(email_end
= strchr(buf
+ 82, '>')) ||
1571 email_end
[1] != ' ' ||
1572 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1573 !message
|| message
[0] != ' ' ||
1574 (message
[1] != '+' && message
[1] != '-') ||
1575 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1576 !isdigit(message
[4]) || !isdigit(message
[5]))
1577 continue; /* corrupt? */
1578 email_end
[1] = '\0';
1579 tz
= strtol(message
+ 1, NULL
, 10);
1580 if (message
[6] != '\t')
1584 ret
= fn(osha1
, nsha1
, buf
+82, timestamp
, tz
, message
, cb_data
);
1592 int for_each_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, void *cb_data
)
1594 return for_each_recent_reflog_ent(ref
, fn
, 0, cb_data
);
1597 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
1599 DIR *dir
= opendir(git_path("logs/%s", base
));
1604 int baselen
= strlen(base
);
1605 char *log
= xmalloc(baselen
+ 257);
1607 memcpy(log
, base
, baselen
);
1608 if (baselen
&& base
[baselen
-1] != '/')
1609 log
[baselen
++] = '/';
1611 while ((de
= readdir(dir
)) != NULL
) {
1615 if (de
->d_name
[0] == '.')
1617 namelen
= strlen(de
->d_name
);
1620 if (has_extension(de
->d_name
, ".lock"))
1622 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
1623 if (stat(git_path("logs/%s", log
), &st
) < 0)
1625 if (S_ISDIR(st
.st_mode
)) {
1626 retval
= do_for_each_reflog(log
, fn
, cb_data
);
1628 unsigned char sha1
[20];
1629 if (!resolve_ref(log
, sha1
, 0, NULL
))
1630 retval
= error("bad ref for %s", log
);
1632 retval
= fn(log
, sha1
, 0, cb_data
);
1645 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
1647 return do_for_each_reflog("", fn
, cb_data
);
1650 int update_ref(const char *action
, const char *refname
,
1651 const unsigned char *sha1
, const unsigned char *oldval
,
1652 int flags
, enum action_on_err onerr
)
1654 static struct ref_lock
*lock
;
1655 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
1657 const char *str
= "Cannot lock the ref '%s'.";
1659 case MSG_ON_ERR
: error(str
, refname
); break;
1660 case DIE_ON_ERR
: die(str
, refname
); break;
1661 case QUIET_ON_ERR
: break;
1665 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
1666 const char *str
= "Cannot update the ref '%s'.";
1668 case MSG_ON_ERR
: error(str
, refname
); break;
1669 case DIE_ON_ERR
: die(str
, refname
); break;
1670 case QUIET_ON_ERR
: break;
1677 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
1679 for ( ; list
; list
= list
->next
)
1680 if (!strcmp(list
->name
, name
))
1681 return (struct ref
*)list
;
1686 * generate a format suitable for scanf from a ref_rev_parse_rules
1687 * rule, that is replace the "%.*s" spec with a "%s" spec
1689 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
1693 spec
= strstr(rule
, "%.*s");
1694 if (!spec
|| strstr(spec
+ 4, "%.*s"))
1695 die("invalid rule in ref_rev_parse_rules: %s", rule
);
1697 /* copy all until spec */
1698 strncpy(scanf_fmt
, rule
, spec
- rule
);
1699 scanf_fmt
[spec
- rule
] = '\0';
1701 strcat(scanf_fmt
, "%s");
1702 /* copy remaining rule */
1703 strcat(scanf_fmt
, spec
+ 4);
1708 char *shorten_unambiguous_ref(const char *ref
, int strict
)
1711 static char **scanf_fmts
;
1712 static int nr_rules
;
1715 /* pre generate scanf formats from ref_rev_parse_rules[] */
1717 size_t total_len
= 0;
1719 /* the rule list is NULL terminated, count them first */
1720 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
1721 /* no +1 because strlen("%s") < strlen("%.*s") */
1722 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
1724 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
1727 for (i
= 0; i
< nr_rules
; i
++) {
1728 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
1730 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
1731 total_len
+= strlen(ref_rev_parse_rules
[i
]);
1735 /* bail out if there are no rules */
1737 return xstrdup(ref
);
1739 /* buffer for scanf result, at most ref must fit */
1740 short_name
= xstrdup(ref
);
1742 /* skip first rule, it will always match */
1743 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
1745 int rules_to_fail
= i
;
1748 if (1 != sscanf(ref
, scanf_fmts
[i
], short_name
))
1751 short_name_len
= strlen(short_name
);
1754 * in strict mode, all (except the matched one) rules
1755 * must fail to resolve to a valid non-ambiguous ref
1758 rules_to_fail
= nr_rules
;
1761 * check if the short name resolves to a valid ref,
1762 * but use only rules prior to the matched one
1764 for (j
= 0; j
< rules_to_fail
; j
++) {
1765 const char *rule
= ref_rev_parse_rules
[j
];
1766 unsigned char short_objectname
[20];
1767 char refname
[PATH_MAX
];
1769 /* skip matched rule */
1774 * the short name is ambiguous, if it resolves
1775 * (with this previous rule) to a valid ref
1776 * read_ref() returns 0 on success
1778 mksnpath(refname
, sizeof(refname
),
1779 rule
, short_name_len
, short_name
);
1780 if (!read_ref(refname
, short_objectname
))
1785 * short name is non-ambiguous if all previous rules
1786 * haven't resolved to a valid ref
1788 if (j
== rules_to_fail
)
1793 return xstrdup(ref
);