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
{
156 struct cached_refs
*next
;
159 struct ref_list
*loose
;
160 struct ref_list
*packed
;
161 /* The submodule name, or "" for the main repo. */
162 char name
[FLEX_ARRAY
];
165 static struct ref_list
*current_ref
;
167 static struct ref_list
*extra_refs
;
169 static void free_ref_list(struct ref_list
*list
)
171 struct ref_list
*next
;
172 for ( ; list
; list
= next
) {
178 static void clear_cached_refs(struct cached_refs
*ca
)
180 if (ca
->did_loose
&& ca
->loose
)
181 free_ref_list(ca
->loose
);
182 if (ca
->did_packed
&& ca
->packed
)
183 free_ref_list(ca
->packed
);
184 ca
->loose
= ca
->packed
= NULL
;
185 ca
->did_loose
= ca
->did_packed
= 0;
188 struct cached_refs
*create_cached_refs(const char *submodule
)
191 struct cached_refs
*refs
;
194 len
= strlen(submodule
) + 1;
195 refs
= xmalloc(sizeof(struct cached_refs
) + len
);
197 refs
->did_loose
= refs
->did_packed
= 0;
198 refs
->loose
= refs
->packed
= NULL
;
199 memcpy(refs
->name
, submodule
, len
);
204 * Return a pointer to a cached_refs for the specified submodule. For
205 * the main repository, use submodule==NULL. The returned structure
206 * will be allocated and initialized but not necessarily populated; it
207 * should not be freed.
209 static struct cached_refs
*get_cached_refs(const char *submodule
)
211 struct cached_refs
*refs
= cached_refs
;
215 if (!strcmp(submodule
, refs
->name
))
220 refs
= create_cached_refs(submodule
);
221 refs
->next
= cached_refs
;
226 static void invalidate_cached_refs(void)
228 struct cached_refs
*refs
= cached_refs
;
230 clear_cached_refs(refs
);
235 static struct ref_list
*read_packed_refs(FILE *f
)
237 struct ref_list
*list
= NULL
;
238 struct ref_list
*last
= NULL
;
239 char refline
[PATH_MAX
];
240 int flag
= REF_ISPACKED
;
242 while (fgets(refline
, sizeof(refline
), f
)) {
243 unsigned char sha1
[20];
245 static const char header
[] = "# pack-refs with:";
247 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
248 const char *traits
= refline
+ sizeof(header
) - 1;
249 if (strstr(traits
, " peeled "))
250 flag
|= REF_KNOWS_PEELED
;
251 /* perhaps other traits later as well */
255 name
= parse_ref_line(refline
, sha1
);
257 list
= add_ref(name
, sha1
, flag
, list
, &last
);
262 strlen(refline
) == 42 &&
263 refline
[41] == '\n' &&
264 !get_sha1_hex(refline
+ 1, sha1
))
265 hashcpy(last
->peeled
, sha1
);
267 return sort_ref_list(list
);
270 void add_extra_ref(const char *name
, const unsigned char *sha1
, int flag
)
272 extra_refs
= add_ref(name
, sha1
, flag
, extra_refs
, NULL
);
275 void clear_extra_refs(void)
277 free_ref_list(extra_refs
);
281 static struct ref_list
*get_packed_refs(const char *submodule
)
283 struct cached_refs
*refs
= get_cached_refs(submodule
);
285 if (!refs
->did_packed
) {
286 const char *packed_refs_file
;
290 packed_refs_file
= git_path_submodule(submodule
, "packed-refs");
292 packed_refs_file
= git_path("packed-refs");
293 f
= fopen(packed_refs_file
, "r");
296 refs
->packed
= read_packed_refs(f
);
299 refs
->did_packed
= 1;
304 static struct ref_list
*get_ref_dir(const char *submodule
, const char *base
,
305 struct ref_list
*list
)
311 path
= git_path_submodule(submodule
, "%s", base
);
313 path
= git_path("%s", base
);
320 int baselen
= strlen(base
);
321 char *ref
= xmalloc(baselen
+ 257);
323 memcpy(ref
, base
, baselen
);
324 if (baselen
&& base
[baselen
-1] != '/')
325 ref
[baselen
++] = '/';
327 while ((de
= readdir(dir
)) != NULL
) {
328 unsigned char sha1
[20];
334 if (de
->d_name
[0] == '.')
336 namelen
= strlen(de
->d_name
);
339 if (has_extension(de
->d_name
, ".lock"))
341 memcpy(ref
+ baselen
, de
->d_name
, namelen
+1);
343 ? git_path_submodule(submodule
, "%s", ref
)
344 : git_path("%s", ref
);
345 if (stat(refdir
, &st
) < 0)
347 if (S_ISDIR(st
.st_mode
)) {
348 list
= get_ref_dir(submodule
, ref
, list
);
354 if (resolve_gitlink_ref(submodule
, ref
, sha1
) < 0) {
359 if (!resolve_ref(ref
, sha1
, 1, &flag
)) {
363 list
= add_ref(ref
, sha1
, flag
, list
, NULL
);
368 return sort_ref_list(list
);
371 struct warn_if_dangling_data
{
377 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
378 int flags
, void *cb_data
)
380 struct warn_if_dangling_data
*d
= cb_data
;
381 const char *resolves_to
;
382 unsigned char junk
[20];
384 if (!(flags
& REF_ISSYMREF
))
387 resolves_to
= resolve_ref(refname
, junk
, 0, NULL
);
388 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
391 fprintf(d
->fp
, d
->msg_fmt
, refname
);
395 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
397 struct warn_if_dangling_data data
;
400 data
.refname
= refname
;
401 data
.msg_fmt
= msg_fmt
;
402 for_each_rawref(warn_if_dangling_symref
, &data
);
405 static struct ref_list
*get_loose_refs(const char *submodule
)
407 struct cached_refs
*refs
= get_cached_refs(submodule
);
409 if (!refs
->did_loose
) {
410 refs
->loose
= get_ref_dir(submodule
, "refs", NULL
);
416 /* We allow "recursive" symbolic refs. Only within reason, though */
418 #define MAXREFLEN (1024)
420 static int resolve_gitlink_packed_ref(char *name
, int pathlen
, const char *refname
, unsigned char *result
)
423 struct ref_list
*packed_refs
;
424 struct ref_list
*ref
;
427 strcpy(name
+ pathlen
, "packed-refs");
428 f
= fopen(name
, "r");
431 packed_refs
= read_packed_refs(f
);
436 if (!strcmp(ref
->name
, refname
)) {
438 memcpy(result
, ref
->sha1
, 20);
443 free_ref_list(packed_refs
);
447 static int resolve_gitlink_ref_recursive(char *name
, int pathlen
, const char *refname
, unsigned char *result
, int recursion
)
449 int fd
, len
= strlen(refname
);
450 char buffer
[128], *p
;
452 if (recursion
> MAXDEPTH
|| len
> MAXREFLEN
)
454 memcpy(name
+ pathlen
, refname
, len
+1);
455 fd
= open(name
, O_RDONLY
);
457 return resolve_gitlink_packed_ref(name
, pathlen
, refname
, result
);
459 len
= read(fd
, buffer
, sizeof(buffer
)-1);
463 while (len
&& isspace(buffer
[len
-1]))
467 /* Was it a detached head or an old-fashioned symlink? */
468 if (!get_sha1_hex(buffer
, result
))
472 if (strncmp(buffer
, "ref:", 4))
478 return resolve_gitlink_ref_recursive(name
, pathlen
, p
, result
, recursion
+1);
481 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *result
)
483 int len
= strlen(path
), retval
;
487 while (len
&& path
[len
-1] == '/')
491 gitdir
= xmalloc(len
+ MAXREFLEN
+ 8);
492 memcpy(gitdir
, path
, len
);
493 memcpy(gitdir
+ len
, "/.git", 6);
496 tmp
= read_gitfile_gently(gitdir
);
500 gitdir
= xmalloc(len
+ MAXREFLEN
+ 3);
501 memcpy(gitdir
, tmp
, len
);
504 gitdir
[++len
] = '\0';
505 retval
= resolve_gitlink_ref_recursive(gitdir
, len
, refname
, result
, 0);
511 * If the "reading" argument is set, this function finds out what _object_
512 * the ref points at by "reading" the ref. The ref, if it is not symbolic,
513 * has to exist, and if it is symbolic, it has to point at an existing ref,
514 * because the "read" goes through the symref to the ref it points at.
516 * The access that is not "reading" may often be "writing", but does not
517 * have to; it can be merely checking _where it leads to_. If it is a
518 * prelude to "writing" to the ref, a write to a symref that points at
519 * yet-to-be-born ref will create the real ref pointed by the symref.
520 * reading=0 allows the caller to check where such a symref leads to.
522 const char *resolve_ref(const char *ref
, unsigned char *sha1
, int reading
, int *flag
)
524 int depth
= MAXDEPTH
;
527 static char ref_buffer
[256];
541 git_snpath(path
, sizeof(path
), "%s", ref
);
542 /* Special case: non-existing file. */
543 if (lstat(path
, &st
) < 0) {
544 struct ref_list
*list
= get_packed_refs(NULL
);
546 if (!strcmp(ref
, list
->name
)) {
547 hashcpy(sha1
, list
->sha1
);
549 *flag
|= REF_ISPACKED
;
554 if (reading
|| errno
!= ENOENT
)
560 /* Follow "normalized" - ie "refs/.." symlinks by hand */
561 if (S_ISLNK(st
.st_mode
)) {
562 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
563 if (len
>= 5 && !memcmp("refs/", buffer
, 5)) {
565 strcpy(ref_buffer
, buffer
);
568 *flag
|= REF_ISSYMREF
;
573 /* Is it a directory? */
574 if (S_ISDIR(st
.st_mode
)) {
580 * Anything else, just open it and try to use it as
583 fd
= open(path
, O_RDONLY
);
586 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
590 * Is it a symbolic ref?
592 if (len
< 4 || memcmp("ref:", buffer
, 4))
596 while (len
&& isspace(*buf
))
598 while (len
&& isspace(buf
[len
-1]))
601 memcpy(ref_buffer
, buf
, len
+ 1);
604 *flag
|= REF_ISSYMREF
;
606 if (len
< 40 || get_sha1_hex(buffer
, sha1
))
611 /* The argument to filter_refs */
618 int read_ref(const char *ref
, unsigned char *sha1
)
620 if (resolve_ref(ref
, sha1
, 1, NULL
))
625 #define DO_FOR_EACH_INCLUDE_BROKEN 01
626 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
627 int flags
, void *cb_data
, struct ref_list
*entry
)
629 if (strncmp(base
, entry
->name
, trim
))
632 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
633 if (entry
->flag
& REF_BROKEN
)
634 return 0; /* ignore dangling symref */
635 if (!has_sha1_file(entry
->sha1
)) {
636 error("%s does not point to a valid object!", entry
->name
);
641 return fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
644 static int filter_refs(const char *ref
, const unsigned char *sha
, int flags
,
647 struct ref_filter
*filter
= (struct ref_filter
*)data
;
648 if (fnmatch(filter
->pattern
, ref
, 0))
650 return filter
->fn(ref
, sha
, flags
, filter
->cb_data
);
653 int peel_ref(const char *ref
, unsigned char *sha1
)
656 unsigned char base
[20];
659 if (current_ref
&& (current_ref
->name
== ref
660 || !strcmp(current_ref
->name
, ref
))) {
661 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
662 hashcpy(sha1
, current_ref
->peeled
);
665 hashcpy(base
, current_ref
->sha1
);
669 if (!resolve_ref(ref
, base
, 1, &flag
))
672 if ((flag
& REF_ISPACKED
)) {
673 struct ref_list
*list
= get_packed_refs(NULL
);
676 if (!strcmp(list
->name
, ref
)) {
677 if (list
->flag
& REF_KNOWS_PEELED
) {
678 hashcpy(sha1
, list
->peeled
);
681 /* older pack-refs did not leave peeled ones */
689 o
= parse_object(base
);
690 if (o
&& o
->type
== OBJ_TAG
) {
691 o
= deref_tag(o
, ref
, 0);
693 hashcpy(sha1
, o
->sha1
);
700 static int do_for_each_ref(const char *submodule
, const char *base
, each_ref_fn fn
,
701 int trim
, int flags
, void *cb_data
)
704 struct ref_list
*packed
= get_packed_refs(submodule
);
705 struct ref_list
*loose
= get_loose_refs(submodule
);
707 struct ref_list
*extra
;
709 for (extra
= extra_refs
; extra
; extra
= extra
->next
)
710 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, extra
);
712 while (packed
&& loose
) {
713 struct ref_list
*entry
;
714 int cmp
= strcmp(packed
->name
, loose
->name
);
716 packed
= packed
->next
;
724 packed
= packed
->next
;
726 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, entry
);
731 for (packed
= packed
? packed
: loose
; packed
; packed
= packed
->next
) {
732 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, packed
);
743 static int do_head_ref(const char *submodule
, each_ref_fn fn
, void *cb_data
)
745 unsigned char sha1
[20];
749 if (resolve_gitlink_ref(submodule
, "HEAD", sha1
) == 0)
750 return fn("HEAD", sha1
, 0, cb_data
);
755 if (resolve_ref("HEAD", sha1
, 1, &flag
))
756 return fn("HEAD", sha1
, flag
, cb_data
);
761 int head_ref(each_ref_fn fn
, void *cb_data
)
763 return do_head_ref(NULL
, fn
, cb_data
);
766 int head_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
768 return do_head_ref(submodule
, fn
, cb_data
);
771 int for_each_ref(each_ref_fn fn
, void *cb_data
)
773 return do_for_each_ref(NULL
, "refs/", fn
, 0, 0, cb_data
);
776 int for_each_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
778 return do_for_each_ref(submodule
, "refs/", fn
, 0, 0, cb_data
);
781 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
783 return do_for_each_ref(NULL
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
786 int for_each_ref_in_submodule(const char *submodule
, const char *prefix
,
787 each_ref_fn fn
, void *cb_data
)
789 return do_for_each_ref(submodule
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
792 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
794 return for_each_ref_in("refs/tags/", fn
, cb_data
);
797 int for_each_tag_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
799 return for_each_ref_in_submodule(submodule
, "refs/tags/", fn
, cb_data
);
802 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
804 return for_each_ref_in("refs/heads/", fn
, cb_data
);
807 int for_each_branch_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
809 return for_each_ref_in_submodule(submodule
, "refs/heads/", fn
, cb_data
);
812 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
814 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
817 int for_each_remote_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
819 return for_each_ref_in_submodule(submodule
, "refs/remotes/", fn
, cb_data
);
822 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
824 return do_for_each_ref(NULL
, "refs/replace/", fn
, 13, 0, cb_data
);
827 int for_each_glob_ref_in(each_ref_fn fn
, const char *pattern
,
828 const char *prefix
, void *cb_data
)
830 struct strbuf real_pattern
= STRBUF_INIT
;
831 struct ref_filter filter
;
834 if (!prefix
&& prefixcmp(pattern
, "refs/"))
835 strbuf_addstr(&real_pattern
, "refs/");
837 strbuf_addstr(&real_pattern
, prefix
);
838 strbuf_addstr(&real_pattern
, pattern
);
840 if (!has_glob_specials(pattern
)) {
841 /* Append implied '/' '*' if not present. */
842 if (real_pattern
.buf
[real_pattern
.len
- 1] != '/')
843 strbuf_addch(&real_pattern
, '/');
844 /* No need to check for '*', there is none. */
845 strbuf_addch(&real_pattern
, '*');
848 filter
.pattern
= real_pattern
.buf
;
850 filter
.cb_data
= cb_data
;
851 ret
= for_each_ref(filter_refs
, &filter
);
853 strbuf_release(&real_pattern
);
857 int for_each_glob_ref(each_ref_fn fn
, const char *pattern
, void *cb_data
)
859 return for_each_glob_ref_in(fn
, pattern
, NULL
, cb_data
);
862 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
864 return do_for_each_ref(NULL
, "refs/", fn
, 0,
865 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
869 * Make sure "ref" is something reasonable to have under ".git/refs/";
870 * We do not like it if:
872 * - any path component of it begins with ".", or
873 * - it has double dots "..", or
874 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
875 * - it ends with a "/".
876 * - it ends with ".lock"
877 * - it contains a "\" (backslash)
880 static inline int bad_ref_char(int ch
)
882 if (((unsigned) ch
) <= ' ' ||
883 ch
== '~' || ch
== '^' || ch
== ':' || ch
== '\\')
885 /* 2.13 Pattern Matching Notation */
886 if (ch
== '?' || ch
== '[') /* Unsupported */
888 if (ch
== '*') /* Supported at the end */
893 int check_ref_format(const char *ref
)
895 int ch
, level
, bad_type
, last
;
896 int ret
= CHECK_REF_FORMAT_OK
;
897 const char *cp
= ref
;
901 while ((ch
= *cp
++) == '/')
902 ; /* tolerate duplicated slashes */
904 /* should not end with slashes */
905 return CHECK_REF_FORMAT_ERROR
;
907 /* we are at the beginning of the path component */
909 return CHECK_REF_FORMAT_ERROR
;
910 bad_type
= bad_ref_char(ch
);
912 if (bad_type
== 2 && (!*cp
|| *cp
== '/') &&
913 ret
== CHECK_REF_FORMAT_OK
)
914 ret
= CHECK_REF_FORMAT_WILDCARD
;
916 return CHECK_REF_FORMAT_ERROR
;
920 /* scan the rest of the path component */
921 while ((ch
= *cp
++) != 0) {
922 bad_type
= bad_ref_char(ch
);
924 return CHECK_REF_FORMAT_ERROR
;
927 if (last
== '.' && ch
== '.')
928 return CHECK_REF_FORMAT_ERROR
;
929 if (last
== '@' && ch
== '{')
930 return CHECK_REF_FORMAT_ERROR
;
935 if (ref
<= cp
- 2 && cp
[-2] == '.')
936 return CHECK_REF_FORMAT_ERROR
;
938 return CHECK_REF_FORMAT_ONELEVEL
;
939 if (has_extension(ref
, ".lock"))
940 return CHECK_REF_FORMAT_ERROR
;
946 const char *prettify_refname(const char *name
)
949 !prefixcmp(name
, "refs/heads/") ? 11 :
950 !prefixcmp(name
, "refs/tags/") ? 10 :
951 !prefixcmp(name
, "refs/remotes/") ? 13 :
955 const char *ref_rev_parse_rules
[] = {
961 "refs/remotes/%.*s/HEAD",
965 const char *ref_fetch_rules
[] = {
972 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
975 const int abbrev_name_len
= strlen(abbrev_name
);
977 for (p
= rules
; *p
; p
++) {
978 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
986 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
987 const unsigned char *old_sha1
, int mustexist
)
989 if (!resolve_ref(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
990 error("Can't verify ref %s", lock
->ref_name
);
994 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
995 error("Ref %s is at %s but expected %s", lock
->ref_name
,
996 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
1003 static int remove_empty_directories(const char *file
)
1005 /* we want to create a file but there is a directory there;
1006 * if that is an empty directory (or a directory that contains
1007 * only empty directories), remove them.
1012 strbuf_init(&path
, 20);
1013 strbuf_addstr(&path
, file
);
1015 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
1017 strbuf_release(&path
);
1022 static int is_refname_available(const char *ref
, const char *oldref
,
1023 struct ref_list
*list
, int quiet
)
1025 int namlen
= strlen(ref
); /* e.g. 'foo/bar' */
1027 /* list->name could be 'foo' or 'foo/bar/baz' */
1028 if (!oldref
|| strcmp(oldref
, list
->name
)) {
1029 int len
= strlen(list
->name
);
1030 int cmplen
= (namlen
< len
) ? namlen
: len
;
1031 const char *lead
= (namlen
< len
) ? list
->name
: ref
;
1032 if (!strncmp(ref
, list
->name
, cmplen
) &&
1033 lead
[cmplen
] == '/') {
1035 error("'%s' exists; cannot create '%s'",
1045 static struct ref_lock
*lock_ref_sha1_basic(const char *ref
, const unsigned char *old_sha1
, int flags
, int *type_p
)
1048 const char *orig_ref
= ref
;
1049 struct ref_lock
*lock
;
1052 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1055 lock
= xcalloc(1, sizeof(struct ref_lock
));
1058 ref
= resolve_ref(ref
, lock
->old_sha1
, mustexist
, &type
);
1059 if (!ref
&& errno
== EISDIR
) {
1060 /* we are trying to lock foo but we used to
1061 * have foo/bar which now does not exist;
1062 * it is normal for the empty directory 'foo'
1065 ref_file
= git_path("%s", orig_ref
);
1066 if (remove_empty_directories(ref_file
)) {
1068 error("there are still refs under '%s'", orig_ref
);
1071 ref
= resolve_ref(orig_ref
, lock
->old_sha1
, mustexist
, &type
);
1077 error("unable to resolve reference %s: %s",
1078 orig_ref
, strerror(errno
));
1081 missing
= is_null_sha1(lock
->old_sha1
);
1082 /* When the ref did not exist and we are creating it,
1083 * make sure there is no existing ref that is packed
1084 * whose name begins with our refname, nor a ref whose
1085 * name is a proper prefix of our refname.
1088 !is_refname_available(ref
, NULL
, get_packed_refs(NULL
), 0)) {
1089 last_errno
= ENOTDIR
;
1093 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1095 lflags
= LOCK_DIE_ON_ERROR
;
1096 if (flags
& REF_NODEREF
) {
1098 lflags
|= LOCK_NODEREF
;
1100 lock
->ref_name
= xstrdup(ref
);
1101 lock
->orig_ref_name
= xstrdup(orig_ref
);
1102 ref_file
= git_path("%s", ref
);
1104 lock
->force_write
= 1;
1105 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
1106 lock
->force_write
= 1;
1108 if (safe_create_leading_directories(ref_file
)) {
1110 error("unable to create directory for %s", ref_file
);
1114 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
1115 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
1123 struct ref_lock
*lock_ref_sha1(const char *ref
, const unsigned char *old_sha1
)
1125 char refpath
[PATH_MAX
];
1126 if (check_ref_format(ref
))
1128 strcpy(refpath
, mkpath("refs/%s", ref
));
1129 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
1132 struct ref_lock
*lock_any_ref_for_update(const char *ref
, const unsigned char *old_sha1
, int flags
)
1134 switch (check_ref_format(ref
)) {
1138 case CHECK_REF_FORMAT_ONELEVEL
:
1139 return lock_ref_sha1_basic(ref
, old_sha1
, flags
, NULL
);
1143 static struct lock_file packlock
;
1145 static int repack_without_ref(const char *refname
)
1147 struct ref_list
*list
, *packed_ref_list
;
1151 packed_ref_list
= get_packed_refs(NULL
);
1152 for (list
= packed_ref_list
; list
; list
= list
->next
) {
1153 if (!strcmp(refname
, list
->name
)) {
1160 fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
1162 unable_to_lock_error(git_path("packed-refs"), errno
);
1163 return error("cannot delete '%s' from packed refs", refname
);
1166 for (list
= packed_ref_list
; list
; list
= list
->next
) {
1167 char line
[PATH_MAX
+ 100];
1170 if (!strcmp(refname
, list
->name
))
1172 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1173 sha1_to_hex(list
->sha1
), list
->name
);
1174 /* this should not happen but just being defensive */
1175 if (len
> sizeof(line
))
1176 die("too long a refname '%s'", list
->name
);
1177 write_or_die(fd
, line
, len
);
1179 return commit_lock_file(&packlock
);
1182 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1184 struct ref_lock
*lock
;
1185 int err
, i
= 0, ret
= 0, flag
= 0;
1187 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1190 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1194 if (!(delopt
& REF_NODEREF
)) {
1195 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1196 lock
->lk
->filename
[i
] = 0;
1197 path
= lock
->lk
->filename
;
1199 path
= git_path("%s", refname
);
1201 err
= unlink_or_warn(path
);
1202 if (err
&& errno
!= ENOENT
)
1205 if (!(delopt
& REF_NODEREF
))
1206 lock
->lk
->filename
[i
] = '.';
1208 /* removing the loose one could have resurrected an earlier
1209 * packed one. Also, if it was not loose we need to repack
1212 ret
|= repack_without_ref(refname
);
1214 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1215 invalidate_cached_refs();
1221 * People using contrib's git-new-workdir have .git/logs/refs ->
1222 * /some/other/path/.git/logs/refs, and that may live on another device.
1224 * IOW, to avoid cross device rename errors, the temporary renamed log must
1225 * live into logs/refs.
1227 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1229 int rename_ref(const char *oldref
, const char *newref
, const char *logmsg
)
1231 static const char renamed_ref
[] = "RENAMED-REF";
1232 unsigned char sha1
[20], orig_sha1
[20];
1233 int flag
= 0, logmoved
= 0;
1234 struct ref_lock
*lock
;
1235 struct stat loginfo
;
1236 int log
= !lstat(git_path("logs/%s", oldref
), &loginfo
);
1237 const char *symref
= NULL
;
1239 if (log
&& S_ISLNK(loginfo
.st_mode
))
1240 return error("reflog for %s is a symlink", oldref
);
1242 symref
= resolve_ref(oldref
, orig_sha1
, 1, &flag
);
1243 if (flag
& REF_ISSYMREF
)
1244 return error("refname %s is a symbolic ref, renaming it is not supported",
1247 return error("refname %s not found", oldref
);
1249 if (!is_refname_available(newref
, oldref
, get_packed_refs(NULL
), 0))
1252 if (!is_refname_available(newref
, oldref
, get_loose_refs(NULL
), 0))
1255 lock
= lock_ref_sha1_basic(renamed_ref
, NULL
, 0, NULL
);
1257 return error("unable to lock %s", renamed_ref
);
1258 lock
->force_write
= 1;
1259 if (write_ref_sha1(lock
, orig_sha1
, logmsg
))
1260 return error("unable to save current sha1 in %s", renamed_ref
);
1262 if (log
&& rename(git_path("logs/%s", oldref
), git_path(TMP_RENAMED_LOG
)))
1263 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG
": %s",
1264 oldref
, strerror(errno
));
1266 if (delete_ref(oldref
, orig_sha1
, REF_NODEREF
)) {
1267 error("unable to delete old %s", oldref
);
1271 if (resolve_ref(newref
, sha1
, 1, &flag
) && delete_ref(newref
, sha1
, REF_NODEREF
)) {
1272 if (errno
==EISDIR
) {
1273 if (remove_empty_directories(git_path("%s", newref
))) {
1274 error("Directory not empty: %s", newref
);
1278 error("unable to delete existing %s", newref
);
1283 if (log
&& safe_create_leading_directories(git_path("logs/%s", newref
))) {
1284 error("unable to create directory for %s", newref
);
1289 if (log
&& rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", newref
))) {
1290 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1292 * rename(a, b) when b is an existing
1293 * directory ought to result in ISDIR, but
1294 * Solaris 5.8 gives ENOTDIR. Sheesh.
1296 if (remove_empty_directories(git_path("logs/%s", newref
))) {
1297 error("Directory not empty: logs/%s", newref
);
1302 error("unable to move logfile "TMP_RENAMED_LOG
" to logs/%s: %s",
1303 newref
, strerror(errno
));
1309 lock
= lock_ref_sha1_basic(newref
, NULL
, 0, NULL
);
1311 error("unable to lock %s for update", newref
);
1314 lock
->force_write
= 1;
1315 hashcpy(lock
->old_sha1
, orig_sha1
);
1316 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1317 error("unable to write current sha1 into %s", newref
);
1324 lock
= lock_ref_sha1_basic(oldref
, NULL
, 0, NULL
);
1326 error("unable to lock %s for rollback", oldref
);
1330 lock
->force_write
= 1;
1331 flag
= log_all_ref_updates
;
1332 log_all_ref_updates
= 0;
1333 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1334 error("unable to write current sha1 into %s", oldref
);
1335 log_all_ref_updates
= flag
;
1338 if (logmoved
&& rename(git_path("logs/%s", newref
), git_path("logs/%s", oldref
)))
1339 error("unable to restore logfile %s from %s: %s",
1340 oldref
, newref
, strerror(errno
));
1341 if (!logmoved
&& log
&&
1342 rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", oldref
)))
1343 error("unable to restore logfile %s from "TMP_RENAMED_LOG
": %s",
1344 oldref
, strerror(errno
));
1349 int close_ref(struct ref_lock
*lock
)
1351 if (close_lock_file(lock
->lk
))
1357 int commit_ref(struct ref_lock
*lock
)
1359 if (commit_lock_file(lock
->lk
))
1365 void unlock_ref(struct ref_lock
*lock
)
1367 /* Do not free lock->lk -- atexit() still looks at them */
1369 rollback_lock_file(lock
->lk
);
1370 free(lock
->ref_name
);
1371 free(lock
->orig_ref_name
);
1376 * copy the reflog message msg to buf, which has been allocated sufficiently
1377 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1378 * because reflog file is one line per entry.
1380 static int copy_msg(char *buf
, const char *msg
)
1387 while ((c
= *msg
++)) {
1388 if (wasspace
&& isspace(c
))
1390 wasspace
= isspace(c
);
1395 while (buf
< cp
&& isspace(cp
[-1]))
1401 int log_ref_setup(const char *ref_name
, char *logfile
, int bufsize
)
1403 int logfd
, oflags
= O_APPEND
| O_WRONLY
;
1405 git_snpath(logfile
, bufsize
, "logs/%s", ref_name
);
1406 if (log_all_ref_updates
&&
1407 (!prefixcmp(ref_name
, "refs/heads/") ||
1408 !prefixcmp(ref_name
, "refs/remotes/") ||
1409 !prefixcmp(ref_name
, "refs/notes/") ||
1410 !strcmp(ref_name
, "HEAD"))) {
1411 if (safe_create_leading_directories(logfile
) < 0)
1412 return error("unable to create directory for %s",
1417 logfd
= open(logfile
, oflags
, 0666);
1419 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1422 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1423 if (remove_empty_directories(logfile
)) {
1424 return error("There are still logs under '%s'",
1427 logfd
= open(logfile
, oflags
, 0666);
1431 return error("Unable to append to %s: %s",
1432 logfile
, strerror(errno
));
1435 adjust_shared_perm(logfile
);
1440 static int log_ref_write(const char *ref_name
, const unsigned char *old_sha1
,
1441 const unsigned char *new_sha1
, const char *msg
)
1443 int logfd
, result
, written
, oflags
= O_APPEND
| O_WRONLY
;
1444 unsigned maxlen
, len
;
1446 char log_file
[PATH_MAX
];
1448 const char *committer
;
1450 if (log_all_ref_updates
< 0)
1451 log_all_ref_updates
= !is_bare_repository();
1453 result
= log_ref_setup(ref_name
, log_file
, sizeof(log_file
));
1457 logfd
= open(log_file
, oflags
);
1460 msglen
= msg
? strlen(msg
) : 0;
1461 committer
= git_committer_info(0);
1462 maxlen
= strlen(committer
) + msglen
+ 100;
1463 logrec
= xmalloc(maxlen
);
1464 len
= sprintf(logrec
, "%s %s %s\n",
1465 sha1_to_hex(old_sha1
),
1466 sha1_to_hex(new_sha1
),
1469 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1470 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1472 if (close(logfd
) != 0 || written
!= len
)
1473 return error("Unable to append to %s", log_file
);
1477 static int is_branch(const char *refname
)
1479 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1482 int write_ref_sha1(struct ref_lock
*lock
,
1483 const unsigned char *sha1
, const char *logmsg
)
1485 static char term
= '\n';
1490 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1494 o
= parse_object(sha1
);
1496 error("Trying to write ref %s with nonexistent object %s",
1497 lock
->ref_name
, sha1_to_hex(sha1
));
1501 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1502 error("Trying to write non-commit object %s to branch %s",
1503 sha1_to_hex(sha1
), lock
->ref_name
);
1507 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1508 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1509 || close_ref(lock
) < 0) {
1510 error("Couldn't write %s", lock
->lk
->filename
);
1514 invalidate_cached_refs();
1515 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1516 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1517 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1521 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1523 * Special hack: If a branch is updated directly and HEAD
1524 * points to it (may happen on the remote side of a push
1525 * for example) then logically the HEAD reflog should be
1527 * A generic solution implies reverse symref information,
1528 * but finding all symrefs pointing to the given branch
1529 * would be rather costly for this rare event (the direct
1530 * update of a branch) to be worth it. So let's cheat and
1531 * check with HEAD only which should cover 99% of all usage
1532 * scenarios (even 100% of the default ones).
1534 unsigned char head_sha1
[20];
1536 const char *head_ref
;
1537 head_ref
= resolve_ref("HEAD", head_sha1
, 1, &head_flag
);
1538 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1539 !strcmp(head_ref
, lock
->ref_name
))
1540 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1542 if (commit_ref(lock
)) {
1543 error("Couldn't set %s", lock
->ref_name
);
1551 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1554 const char *lockpath
;
1556 int fd
, len
, written
;
1557 char *git_HEAD
= git_pathdup("%s", ref_target
);
1558 unsigned char old_sha1
[20], new_sha1
[20];
1560 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1563 if (safe_create_leading_directories(git_HEAD
) < 0)
1564 return error("unable to create directory for %s", git_HEAD
);
1566 #ifndef NO_SYMLINK_HEAD
1567 if (prefer_symlink_refs
) {
1569 if (!symlink(refs_heads_master
, git_HEAD
))
1571 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1575 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1576 if (sizeof(ref
) <= len
) {
1577 error("refname too long: %s", refs_heads_master
);
1578 goto error_free_return
;
1580 lockpath
= mkpath("%s.lock", git_HEAD
);
1581 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1583 error("Unable to open %s for writing", lockpath
);
1584 goto error_free_return
;
1586 written
= write_in_full(fd
, ref
, len
);
1587 if (close(fd
) != 0 || written
!= len
) {
1588 error("Unable to write to %s", lockpath
);
1589 goto error_unlink_return
;
1591 if (rename(lockpath
, git_HEAD
) < 0) {
1592 error("Unable to create %s", git_HEAD
);
1593 goto error_unlink_return
;
1595 if (adjust_shared_perm(git_HEAD
)) {
1596 error("Unable to fix permissions on %s", lockpath
);
1597 error_unlink_return
:
1598 unlink_or_warn(lockpath
);
1604 #ifndef NO_SYMLINK_HEAD
1607 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1608 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1614 static char *ref_msg(const char *line
, const char *endp
)
1618 ep
= memchr(line
, '\n', endp
- line
);
1621 return xmemdupz(line
, ep
- line
);
1624 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
)
1626 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1628 int logfd
, tz
, reccnt
= 0;
1631 unsigned char logged_sha1
[20];
1635 logfile
= git_path("logs/%s", ref
);
1636 logfd
= open(logfile
, O_RDONLY
, 0);
1638 die_errno("Unable to read log '%s'", logfile
);
1641 die("Log %s is empty.", logfile
);
1642 mapsz
= xsize_t(st
.st_size
);
1643 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1644 logdata
= log_mapped
;
1648 rec
= logend
= logdata
+ st
.st_size
;
1649 while (logdata
< rec
) {
1651 if (logdata
< rec
&& *(rec
-1) == '\n')
1654 while (logdata
< rec
&& *(rec
-1) != '\n') {
1660 die("Log %s is corrupt.", logfile
);
1661 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1662 if (date
<= at_time
|| cnt
== 0) {
1663 tz
= strtoul(tz_c
, NULL
, 10);
1665 *msg
= ref_msg(rec
, logend
);
1667 *cutoff_time
= date
;
1671 *cutoff_cnt
= reccnt
- 1;
1673 if (get_sha1_hex(lastrec
, logged_sha1
))
1674 die("Log %s is corrupt.", logfile
);
1675 if (get_sha1_hex(rec
+ 41, sha1
))
1676 die("Log %s is corrupt.", logfile
);
1677 if (hashcmp(logged_sha1
, sha1
)) {
1678 warning("Log %s has gap after %s.",
1679 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1682 else if (date
== at_time
) {
1683 if (get_sha1_hex(rec
+ 41, sha1
))
1684 die("Log %s is corrupt.", logfile
);
1687 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1688 die("Log %s is corrupt.", logfile
);
1689 if (hashcmp(logged_sha1
, sha1
)) {
1690 warning("Log %s unexpectedly ended on %s.",
1691 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1694 munmap(log_mapped
, mapsz
);
1703 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1705 if (rec
== logend
|| *rec
== '\n')
1706 die("Log %s is corrupt.", logfile
);
1707 date
= strtoul(rec
+ 1, &tz_c
, 10);
1708 tz
= strtoul(tz_c
, NULL
, 10);
1709 if (get_sha1_hex(logdata
, sha1
))
1710 die("Log %s is corrupt.", logfile
);
1711 if (is_null_sha1(sha1
)) {
1712 if (get_sha1_hex(logdata
+ 41, sha1
))
1713 die("Log %s is corrupt.", logfile
);
1716 *msg
= ref_msg(logdata
, logend
);
1717 munmap(log_mapped
, mapsz
);
1720 *cutoff_time
= date
;
1724 *cutoff_cnt
= reccnt
;
1728 int for_each_recent_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1730 const char *logfile
;
1732 struct strbuf sb
= STRBUF_INIT
;
1735 logfile
= git_path("logs/%s", ref
);
1736 logfp
= fopen(logfile
, "r");
1741 struct stat statbuf
;
1742 if (fstat(fileno(logfp
), &statbuf
) ||
1743 statbuf
.st_size
< ofs
||
1744 fseek(logfp
, -ofs
, SEEK_END
) ||
1745 strbuf_getwholeline(&sb
, logfp
, '\n')) {
1747 strbuf_release(&sb
);
1752 while (!strbuf_getwholeline(&sb
, logfp
, '\n')) {
1753 unsigned char osha1
[20], nsha1
[20];
1754 char *email_end
, *message
;
1755 unsigned long timestamp
;
1758 /* old SP new SP name <email> SP time TAB msg LF */
1759 if (sb
.len
< 83 || sb
.buf
[sb
.len
- 1] != '\n' ||
1760 get_sha1_hex(sb
.buf
, osha1
) || sb
.buf
[40] != ' ' ||
1761 get_sha1_hex(sb
.buf
+ 41, nsha1
) || sb
.buf
[81] != ' ' ||
1762 !(email_end
= strchr(sb
.buf
+ 82, '>')) ||
1763 email_end
[1] != ' ' ||
1764 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1765 !message
|| message
[0] != ' ' ||
1766 (message
[1] != '+' && message
[1] != '-') ||
1767 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1768 !isdigit(message
[4]) || !isdigit(message
[5]))
1769 continue; /* corrupt? */
1770 email_end
[1] = '\0';
1771 tz
= strtol(message
+ 1, NULL
, 10);
1772 if (message
[6] != '\t')
1776 ret
= fn(osha1
, nsha1
, sb
.buf
+ 82, timestamp
, tz
, message
,
1782 strbuf_release(&sb
);
1786 int for_each_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, void *cb_data
)
1788 return for_each_recent_reflog_ent(ref
, fn
, 0, cb_data
);
1791 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
1793 DIR *dir
= opendir(git_path("logs/%s", base
));
1798 int baselen
= strlen(base
);
1799 char *log
= xmalloc(baselen
+ 257);
1801 memcpy(log
, base
, baselen
);
1802 if (baselen
&& base
[baselen
-1] != '/')
1803 log
[baselen
++] = '/';
1805 while ((de
= readdir(dir
)) != NULL
) {
1809 if (de
->d_name
[0] == '.')
1811 namelen
= strlen(de
->d_name
);
1814 if (has_extension(de
->d_name
, ".lock"))
1816 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
1817 if (stat(git_path("logs/%s", log
), &st
) < 0)
1819 if (S_ISDIR(st
.st_mode
)) {
1820 retval
= do_for_each_reflog(log
, fn
, cb_data
);
1822 unsigned char sha1
[20];
1823 if (!resolve_ref(log
, sha1
, 0, NULL
))
1824 retval
= error("bad ref for %s", log
);
1826 retval
= fn(log
, sha1
, 0, cb_data
);
1839 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
1841 return do_for_each_reflog("", fn
, cb_data
);
1844 int update_ref(const char *action
, const char *refname
,
1845 const unsigned char *sha1
, const unsigned char *oldval
,
1846 int flags
, enum action_on_err onerr
)
1848 static struct ref_lock
*lock
;
1849 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
1851 const char *str
= "Cannot lock the ref '%s'.";
1853 case MSG_ON_ERR
: error(str
, refname
); break;
1854 case DIE_ON_ERR
: die(str
, refname
); break;
1855 case QUIET_ON_ERR
: break;
1859 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
1860 const char *str
= "Cannot update the ref '%s'.";
1862 case MSG_ON_ERR
: error(str
, refname
); break;
1863 case DIE_ON_ERR
: die(str
, refname
); break;
1864 case QUIET_ON_ERR
: break;
1871 int ref_exists(char *refname
)
1873 unsigned char sha1
[20];
1874 return !!resolve_ref(refname
, sha1
, 1, NULL
);
1877 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
1879 for ( ; list
; list
= list
->next
)
1880 if (!strcmp(list
->name
, name
))
1881 return (struct ref
*)list
;
1886 * generate a format suitable for scanf from a ref_rev_parse_rules
1887 * rule, that is replace the "%.*s" spec with a "%s" spec
1889 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
1893 spec
= strstr(rule
, "%.*s");
1894 if (!spec
|| strstr(spec
+ 4, "%.*s"))
1895 die("invalid rule in ref_rev_parse_rules: %s", rule
);
1897 /* copy all until spec */
1898 strncpy(scanf_fmt
, rule
, spec
- rule
);
1899 scanf_fmt
[spec
- rule
] = '\0';
1901 strcat(scanf_fmt
, "%s");
1902 /* copy remaining rule */
1903 strcat(scanf_fmt
, spec
+ 4);
1908 char *shorten_unambiguous_ref(const char *ref
, int strict
)
1911 static char **scanf_fmts
;
1912 static int nr_rules
;
1915 /* pre generate scanf formats from ref_rev_parse_rules[] */
1917 size_t total_len
= 0;
1919 /* the rule list is NULL terminated, count them first */
1920 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
1921 /* no +1 because strlen("%s") < strlen("%.*s") */
1922 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
1924 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
1927 for (i
= 0; i
< nr_rules
; i
++) {
1928 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
1930 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
1931 total_len
+= strlen(ref_rev_parse_rules
[i
]);
1935 /* bail out if there are no rules */
1937 return xstrdup(ref
);
1939 /* buffer for scanf result, at most ref must fit */
1940 short_name
= xstrdup(ref
);
1942 /* skip first rule, it will always match */
1943 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
1945 int rules_to_fail
= i
;
1948 if (1 != sscanf(ref
, scanf_fmts
[i
], short_name
))
1951 short_name_len
= strlen(short_name
);
1954 * in strict mode, all (except the matched one) rules
1955 * must fail to resolve to a valid non-ambiguous ref
1958 rules_to_fail
= nr_rules
;
1961 * check if the short name resolves to a valid ref,
1962 * but use only rules prior to the matched one
1964 for (j
= 0; j
< rules_to_fail
; j
++) {
1965 const char *rule
= ref_rev_parse_rules
[j
];
1966 unsigned char short_objectname
[20];
1967 char refname
[PATH_MAX
];
1969 /* skip matched rule */
1974 * the short name is ambiguous, if it resolves
1975 * (with this previous rule) to a valid ref
1976 * read_ref() returns 0 on success
1978 mksnpath(refname
, sizeof(refname
),
1979 rule
, short_name_len
, short_name
);
1980 if (!read_ref(refname
, short_objectname
))
1985 * short name is non-ambiguous if all previous rules
1986 * haven't resolved to a valid ref
1988 if (j
== rules_to_fail
)
1993 return xstrdup(ref
);