7 /* ISSYMREF=01 and ISPACKED=02 are public interfaces */
8 #define REF_KNOWS_PEELED 04
12 struct ref_list
*next
;
13 unsigned char flag
; /* ISSYMREF? ISPACKED? */
14 unsigned char sha1
[20];
15 unsigned char peeled
[20];
16 char name
[FLEX_ARRAY
];
19 static const char *parse_ref_line(char *line
, unsigned char *sha1
)
22 * 42: the answer to everything.
24 * In this case, it happens to be the answer to
25 * 40 (length of sha1 hex representation)
26 * +1 (space in between hex and name)
27 * +1 (newline at the end of the line)
29 int len
= strlen(line
) - 42;
33 if (get_sha1_hex(line
, sha1
) < 0)
35 if (!isspace(line
[40]))
40 if (line
[len
] != '\n')
47 static struct ref_list
*add_ref(const char *name
, const unsigned char *sha1
,
48 int flag
, struct ref_list
*list
,
49 struct ref_list
**new_entry
)
52 struct ref_list
*entry
;
54 /* Allocate it and add it in.. */
55 len
= strlen(name
) + 1;
56 entry
= xmalloc(sizeof(struct ref_list
) + len
);
57 hashcpy(entry
->sha1
, sha1
);
58 hashclr(entry
->peeled
);
59 memcpy(entry
->name
, name
, len
);
67 /* merge sort the ref list */
68 static struct ref_list
*sort_ref_list(struct ref_list
*list
)
70 int psize
, qsize
, last_merge_count
, cmp
;
71 struct ref_list
*p
, *q
, *l
, *e
;
72 struct ref_list
*new_list
= list
;
80 last_merge_count
= merge_count
;
93 while (psize
< k
&& q
->next
) {
99 while ((psize
> 0) || (qsize
> 0 && q
)) {
100 if (qsize
== 0 || !q
) {
104 } else if (psize
== 0) {
109 cmp
= strcmp(q
->name
, p
->name
);
114 } else if (cmp
> 0) {
119 if (hashcmp(q
->sha1
, p
->sha1
))
120 die("Duplicated ref, and SHA1s don't match: %s",
122 warning("Duplicated ref: %s", q
->name
);
146 } while ((last_merge_count
!= merge_count
) || (last_merge_count
!= 1));
152 * Future: need to be in "struct repository"
153 * when doing a full libification.
155 static struct cached_refs
{
158 struct ref_list
*loose
;
159 struct ref_list
*packed
;
160 /* The submodule name, or "" for the main repo. */
161 char name
[FLEX_ARRAY
];
162 } *cached_refs
, *submodule_refs
;
163 static struct ref_list
*current_ref
;
165 static struct ref_list
*extra_refs
;
167 static void free_ref_list(struct ref_list
*list
)
169 struct ref_list
*next
;
170 for ( ; list
; list
= next
) {
176 static void clear_cached_refs(struct cached_refs
*ca
)
178 if (ca
->did_loose
&& ca
->loose
)
179 free_ref_list(ca
->loose
);
180 if (ca
->did_packed
&& ca
->packed
)
181 free_ref_list(ca
->packed
);
182 ca
->loose
= ca
->packed
= NULL
;
183 ca
->did_loose
= ca
->did_packed
= 0;
186 struct cached_refs
*create_cached_refs(const char *submodule
)
189 struct cached_refs
*refs
;
192 len
= strlen(submodule
) + 1;
193 refs
= xmalloc(sizeof(struct cached_refs
) + len
);
194 refs
->did_loose
= refs
->did_packed
= 0;
195 refs
->loose
= refs
->packed
= NULL
;
196 memcpy(refs
->name
, submodule
, len
);
201 * Return a pointer to a cached_refs for the specified submodule. For
202 * the main repository, use submodule==NULL. The returned structure
203 * will be allocated and initialized but not necessarily populated; it
204 * should not be freed.
206 static struct cached_refs
*get_cached_refs(const char *submodule
)
210 cached_refs
= create_cached_refs(submodule
);
214 submodule_refs
= create_cached_refs(submodule
);
216 /* For now, don't reuse the refs cache for submodules. */
217 clear_cached_refs(submodule_refs
);
218 return submodule_refs
;
222 static void invalidate_cached_refs(void)
224 clear_cached_refs(get_cached_refs(NULL
));
227 static struct ref_list
*read_packed_refs(FILE *f
)
229 struct ref_list
*list
= NULL
;
230 struct ref_list
*last
= NULL
;
231 char refline
[PATH_MAX
];
232 int flag
= REF_ISPACKED
;
234 while (fgets(refline
, sizeof(refline
), f
)) {
235 unsigned char sha1
[20];
237 static const char header
[] = "# pack-refs with:";
239 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
240 const char *traits
= refline
+ sizeof(header
) - 1;
241 if (strstr(traits
, " peeled "))
242 flag
|= REF_KNOWS_PEELED
;
243 /* perhaps other traits later as well */
247 name
= parse_ref_line(refline
, sha1
);
249 list
= add_ref(name
, sha1
, flag
, list
, &last
);
254 strlen(refline
) == 42 &&
255 refline
[41] == '\n' &&
256 !get_sha1_hex(refline
+ 1, sha1
))
257 hashcpy(last
->peeled
, sha1
);
259 return sort_ref_list(list
);
262 void add_extra_ref(const char *name
, const unsigned char *sha1
, int flag
)
264 extra_refs
= add_ref(name
, sha1
, flag
, extra_refs
, NULL
);
267 void clear_extra_refs(void)
269 free_ref_list(extra_refs
);
273 static struct ref_list
*get_packed_refs(const char *submodule
)
275 struct cached_refs
*refs
= get_cached_refs(submodule
);
277 if (!refs
->did_packed
) {
278 const char *packed_refs_file
;
282 packed_refs_file
= git_path_submodule(submodule
, "packed-refs");
284 packed_refs_file
= git_path("packed-refs");
285 f
= fopen(packed_refs_file
, "r");
288 refs
->packed
= read_packed_refs(f
);
291 refs
->did_packed
= 1;
296 static struct ref_list
*get_ref_dir(const char *submodule
, const char *base
,
297 struct ref_list
*list
)
303 path
= git_path_submodule(submodule
, "%s", base
);
305 path
= git_path("%s", base
);
312 int baselen
= strlen(base
);
313 char *ref
= xmalloc(baselen
+ 257);
315 memcpy(ref
, base
, baselen
);
316 if (baselen
&& base
[baselen
-1] != '/')
317 ref
[baselen
++] = '/';
319 while ((de
= readdir(dir
)) != NULL
) {
320 unsigned char sha1
[20];
326 if (de
->d_name
[0] == '.')
328 namelen
= strlen(de
->d_name
);
331 if (has_extension(de
->d_name
, ".lock"))
333 memcpy(ref
+ baselen
, de
->d_name
, namelen
+1);
335 ? git_path_submodule(submodule
, "%s", ref
)
336 : git_path("%s", ref
);
337 if (stat(refdir
, &st
) < 0)
339 if (S_ISDIR(st
.st_mode
)) {
340 list
= get_ref_dir(submodule
, ref
, list
);
346 if (resolve_gitlink_ref(submodule
, ref
, sha1
) < 0) {
351 if (!resolve_ref(ref
, sha1
, 1, &flag
)) {
355 list
= add_ref(ref
, sha1
, flag
, list
, NULL
);
360 return sort_ref_list(list
);
363 struct warn_if_dangling_data
{
369 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
370 int flags
, void *cb_data
)
372 struct warn_if_dangling_data
*d
= cb_data
;
373 const char *resolves_to
;
374 unsigned char junk
[20];
376 if (!(flags
& REF_ISSYMREF
))
379 resolves_to
= resolve_ref(refname
, junk
, 0, NULL
);
380 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
383 fprintf(d
->fp
, d
->msg_fmt
, refname
);
387 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
389 struct warn_if_dangling_data data
;
392 data
.refname
= refname
;
393 data
.msg_fmt
= msg_fmt
;
394 for_each_rawref(warn_if_dangling_symref
, &data
);
397 static struct ref_list
*get_loose_refs(const char *submodule
)
399 struct cached_refs
*refs
= get_cached_refs(submodule
);
401 if (!refs
->did_loose
) {
402 refs
->loose
= get_ref_dir(submodule
, "refs", NULL
);
408 /* We allow "recursive" symbolic refs. Only within reason, though */
410 #define MAXREFLEN (1024)
412 static int resolve_gitlink_packed_ref(char *name
, int pathlen
, const char *refname
, unsigned char *result
)
415 struct ref_list
*packed_refs
;
416 struct ref_list
*ref
;
419 strcpy(name
+ pathlen
, "packed-refs");
420 f
= fopen(name
, "r");
423 packed_refs
= read_packed_refs(f
);
428 if (!strcmp(ref
->name
, refname
)) {
430 memcpy(result
, ref
->sha1
, 20);
435 free_ref_list(packed_refs
);
439 static int resolve_gitlink_ref_recursive(char *name
, int pathlen
, const char *refname
, unsigned char *result
, int recursion
)
441 int fd
, len
= strlen(refname
);
442 char buffer
[128], *p
;
444 if (recursion
> MAXDEPTH
|| len
> MAXREFLEN
)
446 memcpy(name
+ pathlen
, refname
, len
+1);
447 fd
= open(name
, O_RDONLY
);
449 return resolve_gitlink_packed_ref(name
, pathlen
, refname
, result
);
451 len
= read(fd
, buffer
, sizeof(buffer
)-1);
455 while (len
&& isspace(buffer
[len
-1]))
459 /* Was it a detached head or an old-fashioned symlink? */
460 if (!get_sha1_hex(buffer
, result
))
464 if (strncmp(buffer
, "ref:", 4))
470 return resolve_gitlink_ref_recursive(name
, pathlen
, p
, result
, recursion
+1);
473 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *result
)
475 int len
= strlen(path
), retval
;
479 while (len
&& path
[len
-1] == '/')
483 gitdir
= xmalloc(len
+ MAXREFLEN
+ 8);
484 memcpy(gitdir
, path
, len
);
485 memcpy(gitdir
+ len
, "/.git", 6);
488 tmp
= read_gitfile_gently(gitdir
);
492 gitdir
= xmalloc(len
+ MAXREFLEN
+ 3);
493 memcpy(gitdir
, tmp
, len
);
496 gitdir
[++len
] = '\0';
497 retval
= resolve_gitlink_ref_recursive(gitdir
, len
, refname
, result
, 0);
503 * If the "reading" argument is set, this function finds out what _object_
504 * the ref points at by "reading" the ref. The ref, if it is not symbolic,
505 * has to exist, and if it is symbolic, it has to point at an existing ref,
506 * because the "read" goes through the symref to the ref it points at.
508 * The access that is not "reading" may often be "writing", but does not
509 * have to; it can be merely checking _where it leads to_. If it is a
510 * prelude to "writing" to the ref, a write to a symref that points at
511 * yet-to-be-born ref will create the real ref pointed by the symref.
512 * reading=0 allows the caller to check where such a symref leads to.
514 const char *resolve_ref(const char *ref
, unsigned char *sha1
, int reading
, int *flag
)
516 int depth
= MAXDEPTH
;
519 static char ref_buffer
[256];
533 git_snpath(path
, sizeof(path
), "%s", ref
);
534 /* Special case: non-existing file. */
535 if (lstat(path
, &st
) < 0) {
536 struct ref_list
*list
= get_packed_refs(NULL
);
538 if (!strcmp(ref
, list
->name
)) {
539 hashcpy(sha1
, list
->sha1
);
541 *flag
|= REF_ISPACKED
;
546 if (reading
|| errno
!= ENOENT
)
552 /* Follow "normalized" - ie "refs/.." symlinks by hand */
553 if (S_ISLNK(st
.st_mode
)) {
554 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
555 if (len
>= 5 && !memcmp("refs/", buffer
, 5)) {
557 strcpy(ref_buffer
, buffer
);
560 *flag
|= REF_ISSYMREF
;
565 /* Is it a directory? */
566 if (S_ISDIR(st
.st_mode
)) {
572 * Anything else, just open it and try to use it as
575 fd
= open(path
, O_RDONLY
);
578 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
582 * Is it a symbolic ref?
584 if (len
< 4 || memcmp("ref:", buffer
, 4))
588 while (len
&& isspace(*buf
))
590 while (len
&& isspace(buf
[len
-1]))
593 memcpy(ref_buffer
, buf
, len
+ 1);
596 *flag
|= REF_ISSYMREF
;
598 if (len
< 40 || get_sha1_hex(buffer
, sha1
))
603 /* The argument to filter_refs */
610 int read_ref(const char *ref
, unsigned char *sha1
)
612 if (resolve_ref(ref
, sha1
, 1, NULL
))
617 #define DO_FOR_EACH_INCLUDE_BROKEN 01
618 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
619 int flags
, void *cb_data
, struct ref_list
*entry
)
621 if (strncmp(base
, entry
->name
, trim
))
624 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
625 if (entry
->flag
& REF_BROKEN
)
626 return 0; /* ignore dangling symref */
627 if (!has_sha1_file(entry
->sha1
)) {
628 error("%s does not point to a valid object!", entry
->name
);
633 return fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
636 static int filter_refs(const char *ref
, const unsigned char *sha
, int flags
,
639 struct ref_filter
*filter
= (struct ref_filter
*)data
;
640 if (fnmatch(filter
->pattern
, ref
, 0))
642 return filter
->fn(ref
, sha
, flags
, filter
->cb_data
);
645 int peel_ref(const char *ref
, unsigned char *sha1
)
648 unsigned char base
[20];
651 if (current_ref
&& (current_ref
->name
== ref
652 || !strcmp(current_ref
->name
, ref
))) {
653 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
654 hashcpy(sha1
, current_ref
->peeled
);
657 hashcpy(base
, current_ref
->sha1
);
661 if (!resolve_ref(ref
, base
, 1, &flag
))
664 if ((flag
& REF_ISPACKED
)) {
665 struct ref_list
*list
= get_packed_refs(NULL
);
668 if (!strcmp(list
->name
, ref
)) {
669 if (list
->flag
& REF_KNOWS_PEELED
) {
670 hashcpy(sha1
, list
->peeled
);
673 /* older pack-refs did not leave peeled ones */
681 o
= parse_object(base
);
682 if (o
&& o
->type
== OBJ_TAG
) {
683 o
= deref_tag(o
, ref
, 0);
685 hashcpy(sha1
, o
->sha1
);
692 static int do_for_each_ref(const char *submodule
, const char *base
, each_ref_fn fn
,
693 int trim
, int flags
, void *cb_data
)
696 struct ref_list
*packed
= get_packed_refs(submodule
);
697 struct ref_list
*loose
= get_loose_refs(submodule
);
699 struct ref_list
*extra
;
701 for (extra
= extra_refs
; extra
; extra
= extra
->next
)
702 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, extra
);
704 while (packed
&& loose
) {
705 struct ref_list
*entry
;
706 int cmp
= strcmp(packed
->name
, loose
->name
);
708 packed
= packed
->next
;
716 packed
= packed
->next
;
718 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, entry
);
723 for (packed
= packed
? packed
: loose
; packed
; packed
= packed
->next
) {
724 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, packed
);
735 static int do_head_ref(const char *submodule
, each_ref_fn fn
, void *cb_data
)
737 unsigned char sha1
[20];
741 if (resolve_gitlink_ref(submodule
, "HEAD", sha1
) == 0)
742 return fn("HEAD", sha1
, 0, cb_data
);
747 if (resolve_ref("HEAD", sha1
, 1, &flag
))
748 return fn("HEAD", sha1
, flag
, cb_data
);
753 int head_ref(each_ref_fn fn
, void *cb_data
)
755 return do_head_ref(NULL
, fn
, cb_data
);
758 int head_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
760 return do_head_ref(submodule
, fn
, cb_data
);
763 int for_each_ref(each_ref_fn fn
, void *cb_data
)
765 return do_for_each_ref(NULL
, "refs/", fn
, 0, 0, cb_data
);
768 int for_each_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
770 return do_for_each_ref(submodule
, "refs/", fn
, 0, 0, cb_data
);
773 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
775 return do_for_each_ref(NULL
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
778 int for_each_ref_in_submodule(const char *submodule
, const char *prefix
,
779 each_ref_fn fn
, void *cb_data
)
781 return do_for_each_ref(submodule
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
784 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
786 return for_each_ref_in("refs/tags/", fn
, cb_data
);
789 int for_each_tag_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
791 return for_each_ref_in_submodule(submodule
, "refs/tags/", fn
, cb_data
);
794 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
796 return for_each_ref_in("refs/heads/", fn
, cb_data
);
799 int for_each_branch_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
801 return for_each_ref_in_submodule(submodule
, "refs/heads/", fn
, cb_data
);
804 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
806 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
809 int for_each_remote_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
811 return for_each_ref_in_submodule(submodule
, "refs/remotes/", fn
, cb_data
);
814 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
816 return do_for_each_ref(NULL
, "refs/replace/", fn
, 13, 0, cb_data
);
819 int for_each_glob_ref_in(each_ref_fn fn
, const char *pattern
,
820 const char *prefix
, void *cb_data
)
822 struct strbuf real_pattern
= STRBUF_INIT
;
823 struct ref_filter filter
;
826 if (!prefix
&& prefixcmp(pattern
, "refs/"))
827 strbuf_addstr(&real_pattern
, "refs/");
829 strbuf_addstr(&real_pattern
, prefix
);
830 strbuf_addstr(&real_pattern
, pattern
);
832 if (!has_glob_specials(pattern
)) {
833 /* Append implied '/' '*' if not present. */
834 if (real_pattern
.buf
[real_pattern
.len
- 1] != '/')
835 strbuf_addch(&real_pattern
, '/');
836 /* No need to check for '*', there is none. */
837 strbuf_addch(&real_pattern
, '*');
840 filter
.pattern
= real_pattern
.buf
;
842 filter
.cb_data
= cb_data
;
843 ret
= for_each_ref(filter_refs
, &filter
);
845 strbuf_release(&real_pattern
);
849 int for_each_glob_ref(each_ref_fn fn
, const char *pattern
, void *cb_data
)
851 return for_each_glob_ref_in(fn
, pattern
, NULL
, cb_data
);
854 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
856 return do_for_each_ref(NULL
, "refs/", fn
, 0,
857 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
861 * Make sure "ref" is something reasonable to have under ".git/refs/";
862 * We do not like it if:
864 * - any path component of it begins with ".", or
865 * - it has double dots "..", or
866 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
867 * - it ends with a "/".
868 * - it ends with ".lock"
869 * - it contains a "\" (backslash)
872 static inline int bad_ref_char(int ch
)
874 if (((unsigned) ch
) <= ' ' ||
875 ch
== '~' || ch
== '^' || ch
== ':' || ch
== '\\')
877 /* 2.13 Pattern Matching Notation */
878 if (ch
== '?' || ch
== '[') /* Unsupported */
880 if (ch
== '*') /* Supported at the end */
885 int check_ref_format(const char *ref
)
887 int ch
, level
, bad_type
, last
;
888 int ret
= CHECK_REF_FORMAT_OK
;
889 const char *cp
= ref
;
893 while ((ch
= *cp
++) == '/')
894 ; /* tolerate duplicated slashes */
896 /* should not end with slashes */
897 return CHECK_REF_FORMAT_ERROR
;
899 /* we are at the beginning of the path component */
901 return CHECK_REF_FORMAT_ERROR
;
902 bad_type
= bad_ref_char(ch
);
904 if (bad_type
== 2 && (!*cp
|| *cp
== '/') &&
905 ret
== CHECK_REF_FORMAT_OK
)
906 ret
= CHECK_REF_FORMAT_WILDCARD
;
908 return CHECK_REF_FORMAT_ERROR
;
912 /* scan the rest of the path component */
913 while ((ch
= *cp
++) != 0) {
914 bad_type
= bad_ref_char(ch
);
916 return CHECK_REF_FORMAT_ERROR
;
919 if (last
== '.' && ch
== '.')
920 return CHECK_REF_FORMAT_ERROR
;
921 if (last
== '@' && ch
== '{')
922 return CHECK_REF_FORMAT_ERROR
;
927 if (ref
<= cp
- 2 && cp
[-2] == '.')
928 return CHECK_REF_FORMAT_ERROR
;
930 return CHECK_REF_FORMAT_ONELEVEL
;
931 if (has_extension(ref
, ".lock"))
932 return CHECK_REF_FORMAT_ERROR
;
938 const char *prettify_refname(const char *name
)
941 !prefixcmp(name
, "refs/heads/") ? 11 :
942 !prefixcmp(name
, "refs/tags/") ? 10 :
943 !prefixcmp(name
, "refs/remotes/") ? 13 :
947 const char *ref_rev_parse_rules
[] = {
953 "refs/remotes/%.*s/HEAD",
957 const char *ref_fetch_rules
[] = {
964 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
967 const int abbrev_name_len
= strlen(abbrev_name
);
969 for (p
= rules
; *p
; p
++) {
970 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
978 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
979 const unsigned char *old_sha1
, int mustexist
)
981 if (!resolve_ref(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
982 error("Can't verify ref %s", lock
->ref_name
);
986 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
987 error("Ref %s is at %s but expected %s", lock
->ref_name
,
988 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
995 static int remove_empty_directories(const char *file
)
997 /* we want to create a file but there is a directory there;
998 * if that is an empty directory (or a directory that contains
999 * only empty directories), remove them.
1004 strbuf_init(&path
, 20);
1005 strbuf_addstr(&path
, file
);
1007 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
1009 strbuf_release(&path
);
1014 static int is_refname_available(const char *ref
, const char *oldref
,
1015 struct ref_list
*list
, int quiet
)
1017 int namlen
= strlen(ref
); /* e.g. 'foo/bar' */
1019 /* list->name could be 'foo' or 'foo/bar/baz' */
1020 if (!oldref
|| strcmp(oldref
, list
->name
)) {
1021 int len
= strlen(list
->name
);
1022 int cmplen
= (namlen
< len
) ? namlen
: len
;
1023 const char *lead
= (namlen
< len
) ? list
->name
: ref
;
1024 if (!strncmp(ref
, list
->name
, cmplen
) &&
1025 lead
[cmplen
] == '/') {
1027 error("'%s' exists; cannot create '%s'",
1037 static struct ref_lock
*lock_ref_sha1_basic(const char *ref
, const unsigned char *old_sha1
, int flags
, int *type_p
)
1040 const char *orig_ref
= ref
;
1041 struct ref_lock
*lock
;
1044 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1047 lock
= xcalloc(1, sizeof(struct ref_lock
));
1050 ref
= resolve_ref(ref
, lock
->old_sha1
, mustexist
, &type
);
1051 if (!ref
&& errno
== EISDIR
) {
1052 /* we are trying to lock foo but we used to
1053 * have foo/bar which now does not exist;
1054 * it is normal for the empty directory 'foo'
1057 ref_file
= git_path("%s", orig_ref
);
1058 if (remove_empty_directories(ref_file
)) {
1060 error("there are still refs under '%s'", orig_ref
);
1063 ref
= resolve_ref(orig_ref
, lock
->old_sha1
, mustexist
, &type
);
1069 error("unable to resolve reference %s: %s",
1070 orig_ref
, strerror(errno
));
1073 missing
= is_null_sha1(lock
->old_sha1
);
1074 /* When the ref did not exist and we are creating it,
1075 * make sure there is no existing ref that is packed
1076 * whose name begins with our refname, nor a ref whose
1077 * name is a proper prefix of our refname.
1080 !is_refname_available(ref
, NULL
, get_packed_refs(NULL
), 0)) {
1081 last_errno
= ENOTDIR
;
1085 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1087 lflags
= LOCK_DIE_ON_ERROR
;
1088 if (flags
& REF_NODEREF
) {
1090 lflags
|= LOCK_NODEREF
;
1092 lock
->ref_name
= xstrdup(ref
);
1093 lock
->orig_ref_name
= xstrdup(orig_ref
);
1094 ref_file
= git_path("%s", ref
);
1096 lock
->force_write
= 1;
1097 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
1098 lock
->force_write
= 1;
1100 if (safe_create_leading_directories(ref_file
)) {
1102 error("unable to create directory for %s", ref_file
);
1106 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
1107 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
1115 struct ref_lock
*lock_ref_sha1(const char *ref
, const unsigned char *old_sha1
)
1117 char refpath
[PATH_MAX
];
1118 if (check_ref_format(ref
))
1120 strcpy(refpath
, mkpath("refs/%s", ref
));
1121 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
1124 struct ref_lock
*lock_any_ref_for_update(const char *ref
, const unsigned char *old_sha1
, int flags
)
1126 switch (check_ref_format(ref
)) {
1130 case CHECK_REF_FORMAT_ONELEVEL
:
1131 return lock_ref_sha1_basic(ref
, old_sha1
, flags
, NULL
);
1135 static struct lock_file packlock
;
1137 static int repack_without_ref(const char *refname
)
1139 struct ref_list
*list
, *packed_ref_list
;
1143 packed_ref_list
= get_packed_refs(NULL
);
1144 for (list
= packed_ref_list
; list
; list
= list
->next
) {
1145 if (!strcmp(refname
, list
->name
)) {
1152 fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
1154 unable_to_lock_error(git_path("packed-refs"), errno
);
1155 return error("cannot delete '%s' from packed refs", refname
);
1158 for (list
= packed_ref_list
; list
; list
= list
->next
) {
1159 char line
[PATH_MAX
+ 100];
1162 if (!strcmp(refname
, list
->name
))
1164 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1165 sha1_to_hex(list
->sha1
), list
->name
);
1166 /* this should not happen but just being defensive */
1167 if (len
> sizeof(line
))
1168 die("too long a refname '%s'", list
->name
);
1169 write_or_die(fd
, line
, len
);
1171 return commit_lock_file(&packlock
);
1174 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1176 struct ref_lock
*lock
;
1177 int err
, i
= 0, ret
= 0, flag
= 0;
1179 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1182 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1186 if (!(delopt
& REF_NODEREF
)) {
1187 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1188 lock
->lk
->filename
[i
] = 0;
1189 path
= lock
->lk
->filename
;
1191 path
= git_path("%s", refname
);
1193 err
= unlink_or_warn(path
);
1194 if (err
&& errno
!= ENOENT
)
1197 if (!(delopt
& REF_NODEREF
))
1198 lock
->lk
->filename
[i
] = '.';
1200 /* removing the loose one could have resurrected an earlier
1201 * packed one. Also, if it was not loose we need to repack
1204 ret
|= repack_without_ref(refname
);
1206 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1207 invalidate_cached_refs();
1213 * People using contrib's git-new-workdir have .git/logs/refs ->
1214 * /some/other/path/.git/logs/refs, and that may live on another device.
1216 * IOW, to avoid cross device rename errors, the temporary renamed log must
1217 * live into logs/refs.
1219 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1221 int rename_ref(const char *oldref
, const char *newref
, const char *logmsg
)
1223 static const char renamed_ref
[] = "RENAMED-REF";
1224 unsigned char sha1
[20], orig_sha1
[20];
1225 int flag
= 0, logmoved
= 0;
1226 struct ref_lock
*lock
;
1227 struct stat loginfo
;
1228 int log
= !lstat(git_path("logs/%s", oldref
), &loginfo
);
1229 const char *symref
= NULL
;
1231 if (log
&& S_ISLNK(loginfo
.st_mode
))
1232 return error("reflog for %s is a symlink", oldref
);
1234 symref
= resolve_ref(oldref
, orig_sha1
, 1, &flag
);
1235 if (flag
& REF_ISSYMREF
)
1236 return error("refname %s is a symbolic ref, renaming it is not supported",
1239 return error("refname %s not found", oldref
);
1241 if (!is_refname_available(newref
, oldref
, get_packed_refs(NULL
), 0))
1244 if (!is_refname_available(newref
, oldref
, get_loose_refs(NULL
), 0))
1247 lock
= lock_ref_sha1_basic(renamed_ref
, NULL
, 0, NULL
);
1249 return error("unable to lock %s", renamed_ref
);
1250 lock
->force_write
= 1;
1251 if (write_ref_sha1(lock
, orig_sha1
, logmsg
))
1252 return error("unable to save current sha1 in %s", renamed_ref
);
1254 if (log
&& rename(git_path("logs/%s", oldref
), git_path(TMP_RENAMED_LOG
)))
1255 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG
": %s",
1256 oldref
, strerror(errno
));
1258 if (delete_ref(oldref
, orig_sha1
, REF_NODEREF
)) {
1259 error("unable to delete old %s", oldref
);
1263 if (resolve_ref(newref
, sha1
, 1, &flag
) && delete_ref(newref
, sha1
, REF_NODEREF
)) {
1264 if (errno
==EISDIR
) {
1265 if (remove_empty_directories(git_path("%s", newref
))) {
1266 error("Directory not empty: %s", newref
);
1270 error("unable to delete existing %s", newref
);
1275 if (log
&& safe_create_leading_directories(git_path("logs/%s", newref
))) {
1276 error("unable to create directory for %s", newref
);
1281 if (log
&& rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", newref
))) {
1282 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1284 * rename(a, b) when b is an existing
1285 * directory ought to result in ISDIR, but
1286 * Solaris 5.8 gives ENOTDIR. Sheesh.
1288 if (remove_empty_directories(git_path("logs/%s", newref
))) {
1289 error("Directory not empty: logs/%s", newref
);
1294 error("unable to move logfile "TMP_RENAMED_LOG
" to logs/%s: %s",
1295 newref
, strerror(errno
));
1301 lock
= lock_ref_sha1_basic(newref
, NULL
, 0, NULL
);
1303 error("unable to lock %s for update", newref
);
1306 lock
->force_write
= 1;
1307 hashcpy(lock
->old_sha1
, orig_sha1
);
1308 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1309 error("unable to write current sha1 into %s", newref
);
1316 lock
= lock_ref_sha1_basic(oldref
, NULL
, 0, NULL
);
1318 error("unable to lock %s for rollback", oldref
);
1322 lock
->force_write
= 1;
1323 flag
= log_all_ref_updates
;
1324 log_all_ref_updates
= 0;
1325 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1326 error("unable to write current sha1 into %s", oldref
);
1327 log_all_ref_updates
= flag
;
1330 if (logmoved
&& rename(git_path("logs/%s", newref
), git_path("logs/%s", oldref
)))
1331 error("unable to restore logfile %s from %s: %s",
1332 oldref
, newref
, strerror(errno
));
1333 if (!logmoved
&& log
&&
1334 rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", oldref
)))
1335 error("unable to restore logfile %s from "TMP_RENAMED_LOG
": %s",
1336 oldref
, strerror(errno
));
1341 int close_ref(struct ref_lock
*lock
)
1343 if (close_lock_file(lock
->lk
))
1349 int commit_ref(struct ref_lock
*lock
)
1351 if (commit_lock_file(lock
->lk
))
1357 void unlock_ref(struct ref_lock
*lock
)
1359 /* Do not free lock->lk -- atexit() still looks at them */
1361 rollback_lock_file(lock
->lk
);
1362 free(lock
->ref_name
);
1363 free(lock
->orig_ref_name
);
1368 * copy the reflog message msg to buf, which has been allocated sufficiently
1369 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1370 * because reflog file is one line per entry.
1372 static int copy_msg(char *buf
, const char *msg
)
1379 while ((c
= *msg
++)) {
1380 if (wasspace
&& isspace(c
))
1382 wasspace
= isspace(c
);
1387 while (buf
< cp
&& isspace(cp
[-1]))
1393 int log_ref_setup(const char *ref_name
, char *logfile
, int bufsize
)
1395 int logfd
, oflags
= O_APPEND
| O_WRONLY
;
1397 git_snpath(logfile
, bufsize
, "logs/%s", ref_name
);
1398 if (log_all_ref_updates
&&
1399 (!prefixcmp(ref_name
, "refs/heads/") ||
1400 !prefixcmp(ref_name
, "refs/remotes/") ||
1401 !prefixcmp(ref_name
, "refs/notes/") ||
1402 !strcmp(ref_name
, "HEAD"))) {
1403 if (safe_create_leading_directories(logfile
) < 0)
1404 return error("unable to create directory for %s",
1409 logfd
= open(logfile
, oflags
, 0666);
1411 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1414 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1415 if (remove_empty_directories(logfile
)) {
1416 return error("There are still logs under '%s'",
1419 logfd
= open(logfile
, oflags
, 0666);
1423 return error("Unable to append to %s: %s",
1424 logfile
, strerror(errno
));
1427 adjust_shared_perm(logfile
);
1432 static int log_ref_write(const char *ref_name
, const unsigned char *old_sha1
,
1433 const unsigned char *new_sha1
, const char *msg
)
1435 int logfd
, result
, written
, oflags
= O_APPEND
| O_WRONLY
;
1436 unsigned maxlen
, len
;
1438 char log_file
[PATH_MAX
];
1440 const char *committer
;
1442 if (log_all_ref_updates
< 0)
1443 log_all_ref_updates
= !is_bare_repository();
1445 result
= log_ref_setup(ref_name
, log_file
, sizeof(log_file
));
1449 logfd
= open(log_file
, oflags
);
1452 msglen
= msg
? strlen(msg
) : 0;
1453 committer
= git_committer_info(0);
1454 maxlen
= strlen(committer
) + msglen
+ 100;
1455 logrec
= xmalloc(maxlen
);
1456 len
= sprintf(logrec
, "%s %s %s\n",
1457 sha1_to_hex(old_sha1
),
1458 sha1_to_hex(new_sha1
),
1461 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1462 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1464 if (close(logfd
) != 0 || written
!= len
)
1465 return error("Unable to append to %s", log_file
);
1469 static int is_branch(const char *refname
)
1471 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1474 int write_ref_sha1(struct ref_lock
*lock
,
1475 const unsigned char *sha1
, const char *logmsg
)
1477 static char term
= '\n';
1482 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1486 o
= parse_object(sha1
);
1488 error("Trying to write ref %s with nonexistent object %s",
1489 lock
->ref_name
, sha1_to_hex(sha1
));
1493 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1494 error("Trying to write non-commit object %s to branch %s",
1495 sha1_to_hex(sha1
), lock
->ref_name
);
1499 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1500 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1501 || close_ref(lock
) < 0) {
1502 error("Couldn't write %s", lock
->lk
->filename
);
1506 invalidate_cached_refs();
1507 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1508 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1509 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1513 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1515 * Special hack: If a branch is updated directly and HEAD
1516 * points to it (may happen on the remote side of a push
1517 * for example) then logically the HEAD reflog should be
1519 * A generic solution implies reverse symref information,
1520 * but finding all symrefs pointing to the given branch
1521 * would be rather costly for this rare event (the direct
1522 * update of a branch) to be worth it. So let's cheat and
1523 * check with HEAD only which should cover 99% of all usage
1524 * scenarios (even 100% of the default ones).
1526 unsigned char head_sha1
[20];
1528 const char *head_ref
;
1529 head_ref
= resolve_ref("HEAD", head_sha1
, 1, &head_flag
);
1530 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1531 !strcmp(head_ref
, lock
->ref_name
))
1532 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1534 if (commit_ref(lock
)) {
1535 error("Couldn't set %s", lock
->ref_name
);
1543 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1546 const char *lockpath
;
1548 int fd
, len
, written
;
1549 char *git_HEAD
= git_pathdup("%s", ref_target
);
1550 unsigned char old_sha1
[20], new_sha1
[20];
1552 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1555 if (safe_create_leading_directories(git_HEAD
) < 0)
1556 return error("unable to create directory for %s", git_HEAD
);
1558 #ifndef NO_SYMLINK_HEAD
1559 if (prefer_symlink_refs
) {
1561 if (!symlink(refs_heads_master
, git_HEAD
))
1563 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1567 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1568 if (sizeof(ref
) <= len
) {
1569 error("refname too long: %s", refs_heads_master
);
1570 goto error_free_return
;
1572 lockpath
= mkpath("%s.lock", git_HEAD
);
1573 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1575 error("Unable to open %s for writing", lockpath
);
1576 goto error_free_return
;
1578 written
= write_in_full(fd
, ref
, len
);
1579 if (close(fd
) != 0 || written
!= len
) {
1580 error("Unable to write to %s", lockpath
);
1581 goto error_unlink_return
;
1583 if (rename(lockpath
, git_HEAD
) < 0) {
1584 error("Unable to create %s", git_HEAD
);
1585 goto error_unlink_return
;
1587 if (adjust_shared_perm(git_HEAD
)) {
1588 error("Unable to fix permissions on %s", lockpath
);
1589 error_unlink_return
:
1590 unlink_or_warn(lockpath
);
1596 #ifndef NO_SYMLINK_HEAD
1599 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1600 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1606 static char *ref_msg(const char *line
, const char *endp
)
1610 ep
= memchr(line
, '\n', endp
- line
);
1613 return xmemdupz(line
, ep
- line
);
1616 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
)
1618 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1620 int logfd
, tz
, reccnt
= 0;
1623 unsigned char logged_sha1
[20];
1627 logfile
= git_path("logs/%s", ref
);
1628 logfd
= open(logfile
, O_RDONLY
, 0);
1630 die_errno("Unable to read log '%s'", logfile
);
1633 die("Log %s is empty.", logfile
);
1634 mapsz
= xsize_t(st
.st_size
);
1635 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1636 logdata
= log_mapped
;
1640 rec
= logend
= logdata
+ st
.st_size
;
1641 while (logdata
< rec
) {
1643 if (logdata
< rec
&& *(rec
-1) == '\n')
1646 while (logdata
< rec
&& *(rec
-1) != '\n') {
1652 die("Log %s is corrupt.", logfile
);
1653 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1654 if (date
<= at_time
|| cnt
== 0) {
1655 tz
= strtoul(tz_c
, NULL
, 10);
1657 *msg
= ref_msg(rec
, logend
);
1659 *cutoff_time
= date
;
1663 *cutoff_cnt
= reccnt
- 1;
1665 if (get_sha1_hex(lastrec
, logged_sha1
))
1666 die("Log %s is corrupt.", logfile
);
1667 if (get_sha1_hex(rec
+ 41, sha1
))
1668 die("Log %s is corrupt.", logfile
);
1669 if (hashcmp(logged_sha1
, sha1
)) {
1670 warning("Log %s has gap after %s.",
1671 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1674 else if (date
== at_time
) {
1675 if (get_sha1_hex(rec
+ 41, sha1
))
1676 die("Log %s is corrupt.", logfile
);
1679 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1680 die("Log %s is corrupt.", logfile
);
1681 if (hashcmp(logged_sha1
, sha1
)) {
1682 warning("Log %s unexpectedly ended on %s.",
1683 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1686 munmap(log_mapped
, mapsz
);
1695 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1697 if (rec
== logend
|| *rec
== '\n')
1698 die("Log %s is corrupt.", logfile
);
1699 date
= strtoul(rec
+ 1, &tz_c
, 10);
1700 tz
= strtoul(tz_c
, NULL
, 10);
1701 if (get_sha1_hex(logdata
, sha1
))
1702 die("Log %s is corrupt.", logfile
);
1703 if (is_null_sha1(sha1
)) {
1704 if (get_sha1_hex(logdata
+ 41, sha1
))
1705 die("Log %s is corrupt.", logfile
);
1708 *msg
= ref_msg(logdata
, logend
);
1709 munmap(log_mapped
, mapsz
);
1712 *cutoff_time
= date
;
1716 *cutoff_cnt
= reccnt
;
1720 int for_each_recent_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1722 const char *logfile
;
1724 struct strbuf sb
= STRBUF_INIT
;
1727 logfile
= git_path("logs/%s", ref
);
1728 logfp
= fopen(logfile
, "r");
1733 struct stat statbuf
;
1734 if (fstat(fileno(logfp
), &statbuf
) ||
1735 statbuf
.st_size
< ofs
||
1736 fseek(logfp
, -ofs
, SEEK_END
) ||
1737 strbuf_getwholeline(&sb
, logfp
, '\n')) {
1739 strbuf_release(&sb
);
1744 while (!strbuf_getwholeline(&sb
, logfp
, '\n')) {
1745 unsigned char osha1
[20], nsha1
[20];
1746 char *email_end
, *message
;
1747 unsigned long timestamp
;
1750 /* old SP new SP name <email> SP time TAB msg LF */
1751 if (sb
.len
< 83 || sb
.buf
[sb
.len
- 1] != '\n' ||
1752 get_sha1_hex(sb
.buf
, osha1
) || sb
.buf
[40] != ' ' ||
1753 get_sha1_hex(sb
.buf
+ 41, nsha1
) || sb
.buf
[81] != ' ' ||
1754 !(email_end
= strchr(sb
.buf
+ 82, '>')) ||
1755 email_end
[1] != ' ' ||
1756 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1757 !message
|| message
[0] != ' ' ||
1758 (message
[1] != '+' && message
[1] != '-') ||
1759 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1760 !isdigit(message
[4]) || !isdigit(message
[5]))
1761 continue; /* corrupt? */
1762 email_end
[1] = '\0';
1763 tz
= strtol(message
+ 1, NULL
, 10);
1764 if (message
[6] != '\t')
1768 ret
= fn(osha1
, nsha1
, sb
.buf
+ 82, timestamp
, tz
, message
,
1774 strbuf_release(&sb
);
1778 int for_each_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, void *cb_data
)
1780 return for_each_recent_reflog_ent(ref
, fn
, 0, cb_data
);
1783 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
1785 DIR *dir
= opendir(git_path("logs/%s", base
));
1790 int baselen
= strlen(base
);
1791 char *log
= xmalloc(baselen
+ 257);
1793 memcpy(log
, base
, baselen
);
1794 if (baselen
&& base
[baselen
-1] != '/')
1795 log
[baselen
++] = '/';
1797 while ((de
= readdir(dir
)) != NULL
) {
1801 if (de
->d_name
[0] == '.')
1803 namelen
= strlen(de
->d_name
);
1806 if (has_extension(de
->d_name
, ".lock"))
1808 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
1809 if (stat(git_path("logs/%s", log
), &st
) < 0)
1811 if (S_ISDIR(st
.st_mode
)) {
1812 retval
= do_for_each_reflog(log
, fn
, cb_data
);
1814 unsigned char sha1
[20];
1815 if (!resolve_ref(log
, sha1
, 0, NULL
))
1816 retval
= error("bad ref for %s", log
);
1818 retval
= fn(log
, sha1
, 0, cb_data
);
1831 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
1833 return do_for_each_reflog("", fn
, cb_data
);
1836 int update_ref(const char *action
, const char *refname
,
1837 const unsigned char *sha1
, const unsigned char *oldval
,
1838 int flags
, enum action_on_err onerr
)
1840 static struct ref_lock
*lock
;
1841 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
1843 const char *str
= "Cannot lock the ref '%s'.";
1845 case MSG_ON_ERR
: error(str
, refname
); break;
1846 case DIE_ON_ERR
: die(str
, refname
); break;
1847 case QUIET_ON_ERR
: break;
1851 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
1852 const char *str
= "Cannot update the ref '%s'.";
1854 case MSG_ON_ERR
: error(str
, refname
); break;
1855 case DIE_ON_ERR
: die(str
, refname
); break;
1856 case QUIET_ON_ERR
: break;
1863 int ref_exists(char *refname
)
1865 unsigned char sha1
[20];
1866 return !!resolve_ref(refname
, sha1
, 1, NULL
);
1869 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
1871 for ( ; list
; list
= list
->next
)
1872 if (!strcmp(list
->name
, name
))
1873 return (struct ref
*)list
;
1878 * generate a format suitable for scanf from a ref_rev_parse_rules
1879 * rule, that is replace the "%.*s" spec with a "%s" spec
1881 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
1885 spec
= strstr(rule
, "%.*s");
1886 if (!spec
|| strstr(spec
+ 4, "%.*s"))
1887 die("invalid rule in ref_rev_parse_rules: %s", rule
);
1889 /* copy all until spec */
1890 strncpy(scanf_fmt
, rule
, spec
- rule
);
1891 scanf_fmt
[spec
- rule
] = '\0';
1893 strcat(scanf_fmt
, "%s");
1894 /* copy remaining rule */
1895 strcat(scanf_fmt
, spec
+ 4);
1900 char *shorten_unambiguous_ref(const char *ref
, int strict
)
1903 static char **scanf_fmts
;
1904 static int nr_rules
;
1907 /* pre generate scanf formats from ref_rev_parse_rules[] */
1909 size_t total_len
= 0;
1911 /* the rule list is NULL terminated, count them first */
1912 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
1913 /* no +1 because strlen("%s") < strlen("%.*s") */
1914 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
1916 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
1919 for (i
= 0; i
< nr_rules
; i
++) {
1920 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
1922 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
1923 total_len
+= strlen(ref_rev_parse_rules
[i
]);
1927 /* bail out if there are no rules */
1929 return xstrdup(ref
);
1931 /* buffer for scanf result, at most ref must fit */
1932 short_name
= xstrdup(ref
);
1934 /* skip first rule, it will always match */
1935 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
1937 int rules_to_fail
= i
;
1940 if (1 != sscanf(ref
, scanf_fmts
[i
], short_name
))
1943 short_name_len
= strlen(short_name
);
1946 * in strict mode, all (except the matched one) rules
1947 * must fail to resolve to a valid non-ambiguous ref
1950 rules_to_fail
= nr_rules
;
1953 * check if the short name resolves to a valid ref,
1954 * but use only rules prior to the matched one
1956 for (j
= 0; j
< rules_to_fail
; j
++) {
1957 const char *rule
= ref_rev_parse_rules
[j
];
1958 unsigned char short_objectname
[20];
1959 char refname
[PATH_MAX
];
1961 /* skip matched rule */
1966 * the short name is ambiguous, if it resolves
1967 * (with this previous rule) to a valid ref
1968 * read_ref() returns 0 on success
1970 mksnpath(refname
, sizeof(refname
),
1971 rule
, short_name_len
, short_name
);
1972 if (!read_ref(refname
, short_objectname
))
1977 * short name is non-ambiguous if all previous rules
1978 * haven't resolved to a valid ref
1980 if (j
== rules_to_fail
)
1985 return xstrdup(ref
);