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 } cached_refs
, submodule_refs
;
161 static struct ref_list
*current_ref
;
163 static struct ref_list
*extra_refs
;
165 static void free_ref_list(struct ref_list
*list
)
167 struct ref_list
*next
;
168 for ( ; list
; list
= next
) {
174 static void invalidate_cached_refs(void)
176 struct cached_refs
*ca
= &cached_refs
;
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 static void read_packed_refs(FILE *f
, struct cached_refs
*cached_refs
)
188 struct ref_list
*list
= NULL
;
189 struct ref_list
*last
= NULL
;
190 char refline
[PATH_MAX
];
191 int flag
= REF_ISPACKED
;
193 while (fgets(refline
, sizeof(refline
), f
)) {
194 unsigned char sha1
[20];
196 static const char header
[] = "# pack-refs with:";
198 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
199 const char *traits
= refline
+ sizeof(header
) - 1;
200 if (strstr(traits
, " peeled "))
201 flag
|= REF_KNOWS_PEELED
;
202 /* perhaps other traits later as well */
206 name
= parse_ref_line(refline
, sha1
);
208 list
= add_ref(name
, sha1
, flag
, list
, &last
);
213 strlen(refline
) == 42 &&
214 refline
[41] == '\n' &&
215 !get_sha1_hex(refline
+ 1, sha1
))
216 hashcpy(last
->peeled
, sha1
);
218 cached_refs
->packed
= sort_ref_list(list
);
221 void add_extra_ref(const char *name
, const unsigned char *sha1
, int flag
)
223 extra_refs
= add_ref(name
, sha1
, flag
, extra_refs
, NULL
);
226 void clear_extra_refs(void)
228 free_ref_list(extra_refs
);
232 static struct ref_list
*get_packed_refs(const char *submodule
)
234 const char *packed_refs_file
;
235 struct cached_refs
*refs
;
238 packed_refs_file
= git_path_submodule(submodule
, "packed-refs");
239 refs
= &submodule_refs
;
240 free_ref_list(refs
->packed
);
242 packed_refs_file
= git_path("packed-refs");
246 if (!refs
->did_packed
|| submodule
) {
247 FILE *f
= fopen(packed_refs_file
, "r");
250 read_packed_refs(f
, refs
);
253 refs
->did_packed
= 1;
258 static struct ref_list
*get_ref_dir(const char *submodule
, const char *base
,
259 struct ref_list
*list
)
265 path
= git_path_submodule(submodule
, "%s", base
);
267 path
= git_path("%s", base
);
274 int baselen
= strlen(base
);
275 char *ref
= xmalloc(baselen
+ 257);
277 memcpy(ref
, base
, baselen
);
278 if (baselen
&& base
[baselen
-1] != '/')
279 ref
[baselen
++] = '/';
281 while ((de
= readdir(dir
)) != NULL
) {
282 unsigned char sha1
[20];
288 if (de
->d_name
[0] == '.')
290 namelen
= strlen(de
->d_name
);
293 if (has_extension(de
->d_name
, ".lock"))
295 memcpy(ref
+ baselen
, de
->d_name
, namelen
+1);
297 ? git_path_submodule(submodule
, "%s", ref
)
298 : git_path("%s", ref
);
299 if (stat(refdir
, &st
) < 0)
301 if (S_ISDIR(st
.st_mode
)) {
302 list
= get_ref_dir(submodule
, ref
, list
);
308 if (resolve_gitlink_ref(submodule
, ref
, sha1
) < 0) {
313 if (!resolve_ref(ref
, sha1
, 1, &flag
)) {
317 list
= add_ref(ref
, sha1
, flag
, list
, NULL
);
322 return sort_ref_list(list
);
325 struct warn_if_dangling_data
{
331 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
332 int flags
, void *cb_data
)
334 struct warn_if_dangling_data
*d
= cb_data
;
335 const char *resolves_to
;
336 unsigned char junk
[20];
338 if (!(flags
& REF_ISSYMREF
))
341 resolves_to
= resolve_ref(refname
, junk
, 0, NULL
);
342 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
345 fprintf(d
->fp
, d
->msg_fmt
, refname
);
349 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
351 struct warn_if_dangling_data data
;
354 data
.refname
= refname
;
355 data
.msg_fmt
= msg_fmt
;
356 for_each_rawref(warn_if_dangling_symref
, &data
);
359 static struct ref_list
*get_loose_refs(const char *submodule
)
362 free_ref_list(submodule_refs
.loose
);
363 submodule_refs
.loose
= get_ref_dir(submodule
, "refs", NULL
);
364 return submodule_refs
.loose
;
367 if (!cached_refs
.did_loose
) {
368 cached_refs
.loose
= get_ref_dir(NULL
, "refs", NULL
);
369 cached_refs
.did_loose
= 1;
371 return cached_refs
.loose
;
374 /* We allow "recursive" symbolic refs. Only within reason, though */
376 #define MAXREFLEN (1024)
378 static int resolve_gitlink_packed_ref(char *name
, int pathlen
, const char *refname
, unsigned char *result
)
381 struct cached_refs refs
;
382 struct ref_list
*ref
;
385 strcpy(name
+ pathlen
, "packed-refs");
386 f
= fopen(name
, "r");
389 read_packed_refs(f
, &refs
);
394 if (!strcmp(ref
->name
, refname
)) {
396 memcpy(result
, ref
->sha1
, 20);
401 free_ref_list(refs
.packed
);
405 static int resolve_gitlink_ref_recursive(char *name
, int pathlen
, const char *refname
, unsigned char *result
, int recursion
)
407 int fd
, len
= strlen(refname
);
408 char buffer
[128], *p
;
410 if (recursion
> MAXDEPTH
|| len
> MAXREFLEN
)
412 memcpy(name
+ pathlen
, refname
, len
+1);
413 fd
= open(name
, O_RDONLY
);
415 return resolve_gitlink_packed_ref(name
, pathlen
, refname
, result
);
417 len
= read(fd
, buffer
, sizeof(buffer
)-1);
421 while (len
&& isspace(buffer
[len
-1]))
425 /* Was it a detached head or an old-fashioned symlink? */
426 if (!get_sha1_hex(buffer
, result
))
430 if (strncmp(buffer
, "ref:", 4))
436 return resolve_gitlink_ref_recursive(name
, pathlen
, p
, result
, recursion
+1);
439 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *result
)
441 int len
= strlen(path
), retval
;
445 while (len
&& path
[len
-1] == '/')
449 gitdir
= xmalloc(len
+ MAXREFLEN
+ 8);
450 memcpy(gitdir
, path
, len
);
451 memcpy(gitdir
+ len
, "/.git", 6);
454 tmp
= read_gitfile_gently(gitdir
);
458 gitdir
= xmalloc(len
+ MAXREFLEN
+ 3);
459 memcpy(gitdir
, tmp
, len
);
462 gitdir
[++len
] = '\0';
463 retval
= resolve_gitlink_ref_recursive(gitdir
, len
, refname
, result
, 0);
469 * If the "reading" argument is set, this function finds out what _object_
470 * the ref points at by "reading" the ref. The ref, if it is not symbolic,
471 * has to exist, and if it is symbolic, it has to point at an existing ref,
472 * because the "read" goes through the symref to the ref it points at.
474 * The access that is not "reading" may often be "writing", but does not
475 * have to; it can be merely checking _where it leads to_. If it is a
476 * prelude to "writing" to the ref, a write to a symref that points at
477 * yet-to-be-born ref will create the real ref pointed by the symref.
478 * reading=0 allows the caller to check where such a symref leads to.
480 const char *resolve_ref(const char *ref
, unsigned char *sha1
, int reading
, int *flag
)
482 int depth
= MAXDEPTH
;
485 static char ref_buffer
[256];
499 git_snpath(path
, sizeof(path
), "%s", ref
);
500 /* Special case: non-existing file. */
501 if (lstat(path
, &st
) < 0) {
502 struct ref_list
*list
= get_packed_refs(NULL
);
504 if (!strcmp(ref
, list
->name
)) {
505 hashcpy(sha1
, list
->sha1
);
507 *flag
|= REF_ISPACKED
;
512 if (reading
|| errno
!= ENOENT
)
518 /* Follow "normalized" - ie "refs/.." symlinks by hand */
519 if (S_ISLNK(st
.st_mode
)) {
520 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
521 if (len
>= 5 && !memcmp("refs/", buffer
, 5)) {
523 strcpy(ref_buffer
, buffer
);
526 *flag
|= REF_ISSYMREF
;
531 /* Is it a directory? */
532 if (S_ISDIR(st
.st_mode
)) {
538 * Anything else, just open it and try to use it as
541 fd
= open(path
, O_RDONLY
);
544 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
548 * Is it a symbolic ref?
550 if (len
< 4 || memcmp("ref:", buffer
, 4))
554 while (len
&& isspace(*buf
))
556 while (len
&& isspace(buf
[len
-1]))
559 memcpy(ref_buffer
, buf
, len
+ 1);
562 *flag
|= REF_ISSYMREF
;
564 if (len
< 40 || get_sha1_hex(buffer
, sha1
))
569 /* The argument to filter_refs */
576 int read_ref(const char *ref
, unsigned char *sha1
)
578 if (resolve_ref(ref
, sha1
, 1, NULL
))
583 #define DO_FOR_EACH_INCLUDE_BROKEN 01
584 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
585 int flags
, void *cb_data
, struct ref_list
*entry
)
587 if (strncmp(base
, entry
->name
, trim
))
590 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
591 if (entry
->flag
& REF_BROKEN
)
592 return 0; /* ignore dangling symref */
593 if (!has_sha1_file(entry
->sha1
)) {
594 error("%s does not point to a valid object!", entry
->name
);
599 return fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
602 static int filter_refs(const char *ref
, const unsigned char *sha
, int flags
,
605 struct ref_filter
*filter
= (struct ref_filter
*)data
;
606 if (fnmatch(filter
->pattern
, ref
, 0))
608 return filter
->fn(ref
, sha
, flags
, filter
->cb_data
);
611 int peel_ref(const char *ref
, unsigned char *sha1
)
614 unsigned char base
[20];
617 if (current_ref
&& (current_ref
->name
== ref
618 || !strcmp(current_ref
->name
, ref
))) {
619 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
620 hashcpy(sha1
, current_ref
->peeled
);
623 hashcpy(base
, current_ref
->sha1
);
627 if (!resolve_ref(ref
, base
, 1, &flag
))
630 if ((flag
& REF_ISPACKED
)) {
631 struct ref_list
*list
= get_packed_refs(NULL
);
634 if (!strcmp(list
->name
, ref
)) {
635 if (list
->flag
& REF_KNOWS_PEELED
) {
636 hashcpy(sha1
, list
->peeled
);
639 /* older pack-refs did not leave peeled ones */
647 o
= parse_object(base
);
648 if (o
&& o
->type
== OBJ_TAG
) {
649 o
= deref_tag(o
, ref
, 0);
651 hashcpy(sha1
, o
->sha1
);
658 static int do_for_each_ref(const char *submodule
, const char *base
, each_ref_fn fn
,
659 int trim
, int flags
, void *cb_data
)
662 struct ref_list
*packed
= get_packed_refs(submodule
);
663 struct ref_list
*loose
= get_loose_refs(submodule
);
665 struct ref_list
*extra
;
667 for (extra
= extra_refs
; extra
; extra
= extra
->next
)
668 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, extra
);
670 while (packed
&& loose
) {
671 struct ref_list
*entry
;
672 int cmp
= strcmp(packed
->name
, loose
->name
);
674 packed
= packed
->next
;
682 packed
= packed
->next
;
684 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, entry
);
689 for (packed
= packed
? packed
: loose
; packed
; packed
= packed
->next
) {
690 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, packed
);
701 static int do_head_ref(const char *submodule
, each_ref_fn fn
, void *cb_data
)
703 unsigned char sha1
[20];
707 if (resolve_gitlink_ref(submodule
, "HEAD", sha1
) == 0)
708 return fn("HEAD", sha1
, 0, cb_data
);
713 if (resolve_ref("HEAD", sha1
, 1, &flag
))
714 return fn("HEAD", sha1
, flag
, cb_data
);
719 int head_ref(each_ref_fn fn
, void *cb_data
)
721 return do_head_ref(NULL
, fn
, cb_data
);
724 int head_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
726 return do_head_ref(submodule
, fn
, cb_data
);
729 int for_each_ref(each_ref_fn fn
, void *cb_data
)
731 return do_for_each_ref(NULL
, "refs/", fn
, 0, 0, cb_data
);
734 int for_each_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
736 return do_for_each_ref(submodule
, "refs/", fn
, 0, 0, cb_data
);
739 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
741 return do_for_each_ref(NULL
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
744 int for_each_ref_in_submodule(const char *submodule
, const char *prefix
,
745 each_ref_fn fn
, void *cb_data
)
747 return do_for_each_ref(submodule
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
750 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
752 return for_each_ref_in("refs/tags/", fn
, cb_data
);
755 int for_each_tag_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
757 return for_each_ref_in_submodule(submodule
, "refs/tags/", fn
, cb_data
);
760 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
762 return for_each_ref_in("refs/heads/", fn
, cb_data
);
765 int for_each_branch_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
767 return for_each_ref_in_submodule(submodule
, "refs/heads/", fn
, cb_data
);
770 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
772 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
775 int for_each_remote_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
777 return for_each_ref_in_submodule(submodule
, "refs/remotes/", fn
, cb_data
);
780 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
782 return do_for_each_ref(NULL
, "refs/replace/", fn
, 13, 0, cb_data
);
785 int for_each_glob_ref_in(each_ref_fn fn
, const char *pattern
,
786 const char *prefix
, void *cb_data
)
788 struct strbuf real_pattern
= STRBUF_INIT
;
789 struct ref_filter filter
;
792 if (!prefix
&& prefixcmp(pattern
, "refs/"))
793 strbuf_addstr(&real_pattern
, "refs/");
795 strbuf_addstr(&real_pattern
, prefix
);
796 strbuf_addstr(&real_pattern
, pattern
);
798 if (!has_glob_specials(pattern
)) {
799 /* Append implied '/' '*' if not present. */
800 if (real_pattern
.buf
[real_pattern
.len
- 1] != '/')
801 strbuf_addch(&real_pattern
, '/');
802 /* No need to check for '*', there is none. */
803 strbuf_addch(&real_pattern
, '*');
806 filter
.pattern
= real_pattern
.buf
;
808 filter
.cb_data
= cb_data
;
809 ret
= for_each_ref(filter_refs
, &filter
);
811 strbuf_release(&real_pattern
);
815 int for_each_glob_ref(each_ref_fn fn
, const char *pattern
, void *cb_data
)
817 return for_each_glob_ref_in(fn
, pattern
, NULL
, cb_data
);
820 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
822 return do_for_each_ref(NULL
, "refs/", fn
, 0,
823 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
827 * Make sure "ref" is something reasonable to have under ".git/refs/";
828 * We do not like it if:
830 * - any path component of it begins with ".", or
831 * - it has double dots "..", or
832 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
833 * - it ends with a "/".
834 * - it ends with ".lock"
835 * - it contains a "\" (backslash)
838 static inline int bad_ref_char(int ch
)
840 if (((unsigned) ch
) <= ' ' ||
841 ch
== '~' || ch
== '^' || ch
== ':' || ch
== '\\')
843 /* 2.13 Pattern Matching Notation */
844 if (ch
== '?' || ch
== '[') /* Unsupported */
846 if (ch
== '*') /* Supported at the end */
851 int check_ref_format(const char *ref
)
853 int ch
, level
, bad_type
, last
;
854 int ret
= CHECK_REF_FORMAT_OK
;
855 const char *cp
= ref
;
859 while ((ch
= *cp
++) == '/')
860 ; /* tolerate duplicated slashes */
862 /* should not end with slashes */
863 return CHECK_REF_FORMAT_ERROR
;
865 /* we are at the beginning of the path component */
867 return CHECK_REF_FORMAT_ERROR
;
868 bad_type
= bad_ref_char(ch
);
870 if (bad_type
== 2 && (!*cp
|| *cp
== '/') &&
871 ret
== CHECK_REF_FORMAT_OK
)
872 ret
= CHECK_REF_FORMAT_WILDCARD
;
874 return CHECK_REF_FORMAT_ERROR
;
878 /* scan the rest of the path component */
879 while ((ch
= *cp
++) != 0) {
880 bad_type
= bad_ref_char(ch
);
882 return CHECK_REF_FORMAT_ERROR
;
885 if (last
== '.' && ch
== '.')
886 return CHECK_REF_FORMAT_ERROR
;
887 if (last
== '@' && ch
== '{')
888 return CHECK_REF_FORMAT_ERROR
;
893 if (ref
<= cp
- 2 && cp
[-2] == '.')
894 return CHECK_REF_FORMAT_ERROR
;
896 return CHECK_REF_FORMAT_ONELEVEL
;
897 if (has_extension(ref
, ".lock"))
898 return CHECK_REF_FORMAT_ERROR
;
904 const char *prettify_refname(const char *name
)
907 !prefixcmp(name
, "refs/heads/") ? 11 :
908 !prefixcmp(name
, "refs/tags/") ? 10 :
909 !prefixcmp(name
, "refs/remotes/") ? 13 :
913 const char *ref_rev_parse_rules
[] = {
919 "refs/remotes/%.*s/HEAD",
923 const char *ref_fetch_rules
[] = {
930 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
933 const int abbrev_name_len
= strlen(abbrev_name
);
935 for (p
= rules
; *p
; p
++) {
936 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
944 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
945 const unsigned char *old_sha1
, int mustexist
)
947 if (!resolve_ref(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
948 error("Can't verify ref %s", lock
->ref_name
);
952 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
953 error("Ref %s is at %s but expected %s", lock
->ref_name
,
954 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
961 static int remove_empty_directories(const char *file
)
963 /* we want to create a file but there is a directory there;
964 * if that is an empty directory (or a directory that contains
965 * only empty directories), remove them.
970 strbuf_init(&path
, 20);
971 strbuf_addstr(&path
, file
);
973 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
975 strbuf_release(&path
);
980 static int is_refname_available(const char *ref
, const char *oldref
,
981 struct ref_list
*list
, int quiet
)
983 int namlen
= strlen(ref
); /* e.g. 'foo/bar' */
985 /* list->name could be 'foo' or 'foo/bar/baz' */
986 if (!oldref
|| strcmp(oldref
, list
->name
)) {
987 int len
= strlen(list
->name
);
988 int cmplen
= (namlen
< len
) ? namlen
: len
;
989 const char *lead
= (namlen
< len
) ? list
->name
: ref
;
990 if (!strncmp(ref
, list
->name
, cmplen
) &&
991 lead
[cmplen
] == '/') {
993 error("'%s' exists; cannot create '%s'",
1003 static struct ref_lock
*lock_ref_sha1_basic(const char *ref
, const unsigned char *old_sha1
, int flags
, int *type_p
)
1006 const char *orig_ref
= ref
;
1007 struct ref_lock
*lock
;
1010 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1013 lock
= xcalloc(1, sizeof(struct ref_lock
));
1016 ref
= resolve_ref(ref
, lock
->old_sha1
, mustexist
, &type
);
1017 if (!ref
&& errno
== EISDIR
) {
1018 /* we are trying to lock foo but we used to
1019 * have foo/bar which now does not exist;
1020 * it is normal for the empty directory 'foo'
1023 ref_file
= git_path("%s", orig_ref
);
1024 if (remove_empty_directories(ref_file
)) {
1026 error("there are still refs under '%s'", orig_ref
);
1029 ref
= resolve_ref(orig_ref
, lock
->old_sha1
, mustexist
, &type
);
1035 error("unable to resolve reference %s: %s",
1036 orig_ref
, strerror(errno
));
1039 missing
= is_null_sha1(lock
->old_sha1
);
1040 /* When the ref did not exist and we are creating it,
1041 * make sure there is no existing ref that is packed
1042 * whose name begins with our refname, nor a ref whose
1043 * name is a proper prefix of our refname.
1046 !is_refname_available(ref
, NULL
, get_packed_refs(NULL
), 0)) {
1047 last_errno
= ENOTDIR
;
1051 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1053 lflags
= LOCK_DIE_ON_ERROR
;
1054 if (flags
& REF_NODEREF
) {
1056 lflags
|= LOCK_NODEREF
;
1058 lock
->ref_name
= xstrdup(ref
);
1059 lock
->orig_ref_name
= xstrdup(orig_ref
);
1060 ref_file
= git_path("%s", ref
);
1062 lock
->force_write
= 1;
1063 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
1064 lock
->force_write
= 1;
1066 if (safe_create_leading_directories(ref_file
)) {
1068 error("unable to create directory for %s", ref_file
);
1072 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
1073 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
1081 struct ref_lock
*lock_ref_sha1(const char *ref
, const unsigned char *old_sha1
)
1083 char refpath
[PATH_MAX
];
1084 if (check_ref_format(ref
))
1086 strcpy(refpath
, mkpath("refs/%s", ref
));
1087 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
1090 struct ref_lock
*lock_any_ref_for_update(const char *ref
, const unsigned char *old_sha1
, int flags
)
1092 switch (check_ref_format(ref
)) {
1096 case CHECK_REF_FORMAT_ONELEVEL
:
1097 return lock_ref_sha1_basic(ref
, old_sha1
, flags
, NULL
);
1101 static struct lock_file packlock
;
1103 static int repack_without_ref(const char *refname
)
1105 struct ref_list
*list
, *packed_ref_list
;
1109 packed_ref_list
= get_packed_refs(NULL
);
1110 for (list
= packed_ref_list
; list
; list
= list
->next
) {
1111 if (!strcmp(refname
, list
->name
)) {
1118 fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
1120 unable_to_lock_error(git_path("packed-refs"), errno
);
1121 return error("cannot delete '%s' from packed refs", refname
);
1124 for (list
= packed_ref_list
; list
; list
= list
->next
) {
1125 char line
[PATH_MAX
+ 100];
1128 if (!strcmp(refname
, list
->name
))
1130 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1131 sha1_to_hex(list
->sha1
), list
->name
);
1132 /* this should not happen but just being defensive */
1133 if (len
> sizeof(line
))
1134 die("too long a refname '%s'", list
->name
);
1135 write_or_die(fd
, line
, len
);
1137 return commit_lock_file(&packlock
);
1140 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1142 struct ref_lock
*lock
;
1143 int err
, i
= 0, ret
= 0, flag
= 0;
1145 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1148 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1152 if (!(delopt
& REF_NODEREF
)) {
1153 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1154 lock
->lk
->filename
[i
] = 0;
1155 path
= lock
->lk
->filename
;
1157 path
= git_path("%s", refname
);
1159 err
= unlink_or_warn(path
);
1160 if (err
&& errno
!= ENOENT
)
1163 if (!(delopt
& REF_NODEREF
))
1164 lock
->lk
->filename
[i
] = '.';
1166 /* removing the loose one could have resurrected an earlier
1167 * packed one. Also, if it was not loose we need to repack
1170 ret
|= repack_without_ref(refname
);
1172 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1173 invalidate_cached_refs();
1179 * People using contrib's git-new-workdir have .git/logs/refs ->
1180 * /some/other/path/.git/logs/refs, and that may live on another device.
1182 * IOW, to avoid cross device rename errors, the temporary renamed log must
1183 * live into logs/refs.
1185 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1187 int rename_ref(const char *oldref
, const char *newref
, const char *logmsg
)
1189 static const char renamed_ref
[] = "RENAMED-REF";
1190 unsigned char sha1
[20], orig_sha1
[20];
1191 int flag
= 0, logmoved
= 0;
1192 struct ref_lock
*lock
;
1193 struct stat loginfo
;
1194 int log
= !lstat(git_path("logs/%s", oldref
), &loginfo
);
1195 const char *symref
= NULL
;
1197 if (log
&& S_ISLNK(loginfo
.st_mode
))
1198 return error("reflog for %s is a symlink", oldref
);
1200 symref
= resolve_ref(oldref
, orig_sha1
, 1, &flag
);
1201 if (flag
& REF_ISSYMREF
)
1202 return error("refname %s is a symbolic ref, renaming it is not supported",
1205 return error("refname %s not found", oldref
);
1207 if (!is_refname_available(newref
, oldref
, get_packed_refs(NULL
), 0))
1210 if (!is_refname_available(newref
, oldref
, get_loose_refs(NULL
), 0))
1213 lock
= lock_ref_sha1_basic(renamed_ref
, NULL
, 0, NULL
);
1215 return error("unable to lock %s", renamed_ref
);
1216 lock
->force_write
= 1;
1217 if (write_ref_sha1(lock
, orig_sha1
, logmsg
))
1218 return error("unable to save current sha1 in %s", renamed_ref
);
1220 if (log
&& rename(git_path("logs/%s", oldref
), git_path(TMP_RENAMED_LOG
)))
1221 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG
": %s",
1222 oldref
, strerror(errno
));
1224 if (delete_ref(oldref
, orig_sha1
, REF_NODEREF
)) {
1225 error("unable to delete old %s", oldref
);
1229 if (resolve_ref(newref
, sha1
, 1, &flag
) && delete_ref(newref
, sha1
, REF_NODEREF
)) {
1230 if (errno
==EISDIR
) {
1231 if (remove_empty_directories(git_path("%s", newref
))) {
1232 error("Directory not empty: %s", newref
);
1236 error("unable to delete existing %s", newref
);
1241 if (log
&& safe_create_leading_directories(git_path("logs/%s", newref
))) {
1242 error("unable to create directory for %s", newref
);
1247 if (log
&& rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", newref
))) {
1248 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1250 * rename(a, b) when b is an existing
1251 * directory ought to result in ISDIR, but
1252 * Solaris 5.8 gives ENOTDIR. Sheesh.
1254 if (remove_empty_directories(git_path("logs/%s", newref
))) {
1255 error("Directory not empty: logs/%s", newref
);
1260 error("unable to move logfile "TMP_RENAMED_LOG
" to logs/%s: %s",
1261 newref
, strerror(errno
));
1267 lock
= lock_ref_sha1_basic(newref
, NULL
, 0, NULL
);
1269 error("unable to lock %s for update", newref
);
1272 lock
->force_write
= 1;
1273 hashcpy(lock
->old_sha1
, orig_sha1
);
1274 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1275 error("unable to write current sha1 into %s", newref
);
1282 lock
= lock_ref_sha1_basic(oldref
, NULL
, 0, NULL
);
1284 error("unable to lock %s for rollback", oldref
);
1288 lock
->force_write
= 1;
1289 flag
= log_all_ref_updates
;
1290 log_all_ref_updates
= 0;
1291 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1292 error("unable to write current sha1 into %s", oldref
);
1293 log_all_ref_updates
= flag
;
1296 if (logmoved
&& rename(git_path("logs/%s", newref
), git_path("logs/%s", oldref
)))
1297 error("unable to restore logfile %s from %s: %s",
1298 oldref
, newref
, strerror(errno
));
1299 if (!logmoved
&& log
&&
1300 rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", oldref
)))
1301 error("unable to restore logfile %s from "TMP_RENAMED_LOG
": %s",
1302 oldref
, strerror(errno
));
1307 int close_ref(struct ref_lock
*lock
)
1309 if (close_lock_file(lock
->lk
))
1315 int commit_ref(struct ref_lock
*lock
)
1317 if (commit_lock_file(lock
->lk
))
1323 void unlock_ref(struct ref_lock
*lock
)
1325 /* Do not free lock->lk -- atexit() still looks at them */
1327 rollback_lock_file(lock
->lk
);
1328 free(lock
->ref_name
);
1329 free(lock
->orig_ref_name
);
1334 * copy the reflog message msg to buf, which has been allocated sufficiently
1335 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1336 * because reflog file is one line per entry.
1338 static int copy_msg(char *buf
, const char *msg
)
1345 while ((c
= *msg
++)) {
1346 if (wasspace
&& isspace(c
))
1348 wasspace
= isspace(c
);
1353 while (buf
< cp
&& isspace(cp
[-1]))
1359 int log_ref_setup(const char *ref_name
, char *logfile
, int bufsize
)
1361 int logfd
, oflags
= O_APPEND
| O_WRONLY
;
1363 git_snpath(logfile
, bufsize
, "logs/%s", ref_name
);
1364 if (log_all_ref_updates
&&
1365 (!prefixcmp(ref_name
, "refs/heads/") ||
1366 !prefixcmp(ref_name
, "refs/remotes/") ||
1367 !prefixcmp(ref_name
, "refs/notes/") ||
1368 !strcmp(ref_name
, "HEAD"))) {
1369 if (safe_create_leading_directories(logfile
) < 0)
1370 return error("unable to create directory for %s",
1375 logfd
= open(logfile
, oflags
, 0666);
1377 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1380 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1381 if (remove_empty_directories(logfile
)) {
1382 return error("There are still logs under '%s'",
1385 logfd
= open(logfile
, oflags
, 0666);
1389 return error("Unable to append to %s: %s",
1390 logfile
, strerror(errno
));
1393 adjust_shared_perm(logfile
);
1398 static int log_ref_write(const char *ref_name
, const unsigned char *old_sha1
,
1399 const unsigned char *new_sha1
, const char *msg
)
1401 int logfd
, result
, written
, oflags
= O_APPEND
| O_WRONLY
;
1402 unsigned maxlen
, len
;
1404 char log_file
[PATH_MAX
];
1406 const char *committer
;
1408 if (log_all_ref_updates
< 0)
1409 log_all_ref_updates
= !is_bare_repository();
1411 result
= log_ref_setup(ref_name
, log_file
, sizeof(log_file
));
1415 logfd
= open(log_file
, oflags
);
1418 msglen
= msg
? strlen(msg
) : 0;
1419 committer
= git_committer_info(0);
1420 maxlen
= strlen(committer
) + msglen
+ 100;
1421 logrec
= xmalloc(maxlen
);
1422 len
= sprintf(logrec
, "%s %s %s\n",
1423 sha1_to_hex(old_sha1
),
1424 sha1_to_hex(new_sha1
),
1427 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1428 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1430 if (close(logfd
) != 0 || written
!= len
)
1431 return error("Unable to append to %s", log_file
);
1435 static int is_branch(const char *refname
)
1437 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1440 int write_ref_sha1(struct ref_lock
*lock
,
1441 const unsigned char *sha1
, const char *logmsg
)
1443 static char term
= '\n';
1448 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1452 o
= parse_object(sha1
);
1454 error("Trying to write ref %s with nonexistant object %s",
1455 lock
->ref_name
, sha1_to_hex(sha1
));
1459 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1460 error("Trying to write non-commit object %s to branch %s",
1461 sha1_to_hex(sha1
), lock
->ref_name
);
1465 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1466 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1467 || close_ref(lock
) < 0) {
1468 error("Couldn't write %s", lock
->lk
->filename
);
1472 invalidate_cached_refs();
1473 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1474 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1475 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1479 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1481 * Special hack: If a branch is updated directly and HEAD
1482 * points to it (may happen on the remote side of a push
1483 * for example) then logically the HEAD reflog should be
1485 * A generic solution implies reverse symref information,
1486 * but finding all symrefs pointing to the given branch
1487 * would be rather costly for this rare event (the direct
1488 * update of a branch) to be worth it. So let's cheat and
1489 * check with HEAD only which should cover 99% of all usage
1490 * scenarios (even 100% of the default ones).
1492 unsigned char head_sha1
[20];
1494 const char *head_ref
;
1495 head_ref
= resolve_ref("HEAD", head_sha1
, 1, &head_flag
);
1496 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1497 !strcmp(head_ref
, lock
->ref_name
))
1498 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1500 if (commit_ref(lock
)) {
1501 error("Couldn't set %s", lock
->ref_name
);
1509 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1512 const char *lockpath
;
1514 int fd
, len
, written
;
1515 char *git_HEAD
= git_pathdup("%s", ref_target
);
1516 unsigned char old_sha1
[20], new_sha1
[20];
1518 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1521 if (safe_create_leading_directories(git_HEAD
) < 0)
1522 return error("unable to create directory for %s", git_HEAD
);
1524 #ifndef NO_SYMLINK_HEAD
1525 if (prefer_symlink_refs
) {
1527 if (!symlink(refs_heads_master
, git_HEAD
))
1529 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1533 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1534 if (sizeof(ref
) <= len
) {
1535 error("refname too long: %s", refs_heads_master
);
1536 goto error_free_return
;
1538 lockpath
= mkpath("%s.lock", git_HEAD
);
1539 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1541 error("Unable to open %s for writing", lockpath
);
1542 goto error_free_return
;
1544 written
= write_in_full(fd
, ref
, len
);
1545 if (close(fd
) != 0 || written
!= len
) {
1546 error("Unable to write to %s", lockpath
);
1547 goto error_unlink_return
;
1549 if (rename(lockpath
, git_HEAD
) < 0) {
1550 error("Unable to create %s", git_HEAD
);
1551 goto error_unlink_return
;
1553 if (adjust_shared_perm(git_HEAD
)) {
1554 error("Unable to fix permissions on %s", lockpath
);
1555 error_unlink_return
:
1556 unlink_or_warn(lockpath
);
1562 #ifndef NO_SYMLINK_HEAD
1565 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1566 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1572 static char *ref_msg(const char *line
, const char *endp
)
1576 ep
= memchr(line
, '\n', endp
- line
);
1579 return xmemdupz(line
, ep
- line
);
1582 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
)
1584 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1586 int logfd
, tz
, reccnt
= 0;
1589 unsigned char logged_sha1
[20];
1593 logfile
= git_path("logs/%s", ref
);
1594 logfd
= open(logfile
, O_RDONLY
, 0);
1596 die_errno("Unable to read log '%s'", logfile
);
1599 die("Log %s is empty.", logfile
);
1600 mapsz
= xsize_t(st
.st_size
);
1601 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1602 logdata
= log_mapped
;
1606 rec
= logend
= logdata
+ st
.st_size
;
1607 while (logdata
< rec
) {
1609 if (logdata
< rec
&& *(rec
-1) == '\n')
1612 while (logdata
< rec
&& *(rec
-1) != '\n') {
1618 die("Log %s is corrupt.", logfile
);
1619 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1620 if (date
<= at_time
|| cnt
== 0) {
1621 tz
= strtoul(tz_c
, NULL
, 10);
1623 *msg
= ref_msg(rec
, logend
);
1625 *cutoff_time
= date
;
1629 *cutoff_cnt
= reccnt
- 1;
1631 if (get_sha1_hex(lastrec
, logged_sha1
))
1632 die("Log %s is corrupt.", logfile
);
1633 if (get_sha1_hex(rec
+ 41, sha1
))
1634 die("Log %s is corrupt.", logfile
);
1635 if (hashcmp(logged_sha1
, sha1
)) {
1636 warning("Log %s has gap after %s.",
1637 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1640 else if (date
== at_time
) {
1641 if (get_sha1_hex(rec
+ 41, sha1
))
1642 die("Log %s is corrupt.", logfile
);
1645 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1646 die("Log %s is corrupt.", logfile
);
1647 if (hashcmp(logged_sha1
, sha1
)) {
1648 warning("Log %s unexpectedly ended on %s.",
1649 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1652 munmap(log_mapped
, mapsz
);
1661 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1663 if (rec
== logend
|| *rec
== '\n')
1664 die("Log %s is corrupt.", logfile
);
1665 date
= strtoul(rec
+ 1, &tz_c
, 10);
1666 tz
= strtoul(tz_c
, NULL
, 10);
1667 if (get_sha1_hex(logdata
, sha1
))
1668 die("Log %s is corrupt.", logfile
);
1669 if (is_null_sha1(sha1
)) {
1670 if (get_sha1_hex(logdata
+ 41, sha1
))
1671 die("Log %s is corrupt.", logfile
);
1674 *msg
= ref_msg(logdata
, logend
);
1675 munmap(log_mapped
, mapsz
);
1678 *cutoff_time
= date
;
1682 *cutoff_cnt
= reccnt
;
1686 int for_each_recent_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1688 const char *logfile
;
1690 struct strbuf sb
= STRBUF_INIT
;
1693 logfile
= git_path("logs/%s", ref
);
1694 logfp
= fopen(logfile
, "r");
1699 struct stat statbuf
;
1700 if (fstat(fileno(logfp
), &statbuf
) ||
1701 statbuf
.st_size
< ofs
||
1702 fseek(logfp
, -ofs
, SEEK_END
) ||
1703 strbuf_getwholeline(&sb
, logfp
, '\n')) {
1705 strbuf_release(&sb
);
1710 while (!strbuf_getwholeline(&sb
, logfp
, '\n')) {
1711 unsigned char osha1
[20], nsha1
[20];
1712 char *email_end
, *message
;
1713 unsigned long timestamp
;
1716 /* old SP new SP name <email> SP time TAB msg LF */
1717 if (sb
.len
< 83 || sb
.buf
[sb
.len
- 1] != '\n' ||
1718 get_sha1_hex(sb
.buf
, osha1
) || sb
.buf
[40] != ' ' ||
1719 get_sha1_hex(sb
.buf
+ 41, nsha1
) || sb
.buf
[81] != ' ' ||
1720 !(email_end
= strchr(sb
.buf
+ 82, '>')) ||
1721 email_end
[1] != ' ' ||
1722 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1723 !message
|| message
[0] != ' ' ||
1724 (message
[1] != '+' && message
[1] != '-') ||
1725 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1726 !isdigit(message
[4]) || !isdigit(message
[5]))
1727 continue; /* corrupt? */
1728 email_end
[1] = '\0';
1729 tz
= strtol(message
+ 1, NULL
, 10);
1730 if (message
[6] != '\t')
1734 ret
= fn(osha1
, nsha1
, sb
.buf
+ 82, timestamp
, tz
, message
,
1740 strbuf_release(&sb
);
1744 int for_each_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, void *cb_data
)
1746 return for_each_recent_reflog_ent(ref
, fn
, 0, cb_data
);
1749 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
1751 DIR *dir
= opendir(git_path("logs/%s", base
));
1756 int baselen
= strlen(base
);
1757 char *log
= xmalloc(baselen
+ 257);
1759 memcpy(log
, base
, baselen
);
1760 if (baselen
&& base
[baselen
-1] != '/')
1761 log
[baselen
++] = '/';
1763 while ((de
= readdir(dir
)) != NULL
) {
1767 if (de
->d_name
[0] == '.')
1769 namelen
= strlen(de
->d_name
);
1772 if (has_extension(de
->d_name
, ".lock"))
1774 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
1775 if (stat(git_path("logs/%s", log
), &st
) < 0)
1777 if (S_ISDIR(st
.st_mode
)) {
1778 retval
= do_for_each_reflog(log
, fn
, cb_data
);
1780 unsigned char sha1
[20];
1781 if (!resolve_ref(log
, sha1
, 0, NULL
))
1782 retval
= error("bad ref for %s", log
);
1784 retval
= fn(log
, sha1
, 0, cb_data
);
1797 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
1799 return do_for_each_reflog("", fn
, cb_data
);
1802 int update_ref(const char *action
, const char *refname
,
1803 const unsigned char *sha1
, const unsigned char *oldval
,
1804 int flags
, enum action_on_err onerr
)
1806 static struct ref_lock
*lock
;
1807 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
1809 const char *str
= "Cannot lock the ref '%s'.";
1811 case MSG_ON_ERR
: error(str
, refname
); break;
1812 case DIE_ON_ERR
: die(str
, refname
); break;
1813 case QUIET_ON_ERR
: break;
1817 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
1818 const char *str
= "Cannot update the ref '%s'.";
1820 case MSG_ON_ERR
: error(str
, refname
); break;
1821 case DIE_ON_ERR
: die(str
, refname
); break;
1822 case QUIET_ON_ERR
: break;
1829 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
1831 for ( ; list
; list
= list
->next
)
1832 if (!strcmp(list
->name
, name
))
1833 return (struct ref
*)list
;
1838 * generate a format suitable for scanf from a ref_rev_parse_rules
1839 * rule, that is replace the "%.*s" spec with a "%s" spec
1841 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
1845 spec
= strstr(rule
, "%.*s");
1846 if (!spec
|| strstr(spec
+ 4, "%.*s"))
1847 die("invalid rule in ref_rev_parse_rules: %s", rule
);
1849 /* copy all until spec */
1850 strncpy(scanf_fmt
, rule
, spec
- rule
);
1851 scanf_fmt
[spec
- rule
] = '\0';
1853 strcat(scanf_fmt
, "%s");
1854 /* copy remaining rule */
1855 strcat(scanf_fmt
, spec
+ 4);
1860 char *shorten_unambiguous_ref(const char *ref
, int strict
)
1863 static char **scanf_fmts
;
1864 static int nr_rules
;
1867 /* pre generate scanf formats from ref_rev_parse_rules[] */
1869 size_t total_len
= 0;
1871 /* the rule list is NULL terminated, count them first */
1872 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
1873 /* no +1 because strlen("%s") < strlen("%.*s") */
1874 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
1876 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
1879 for (i
= 0; i
< nr_rules
; i
++) {
1880 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
1882 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
1883 total_len
+= strlen(ref_rev_parse_rules
[i
]);
1887 /* bail out if there are no rules */
1889 return xstrdup(ref
);
1891 /* buffer for scanf result, at most ref must fit */
1892 short_name
= xstrdup(ref
);
1894 /* skip first rule, it will always match */
1895 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
1897 int rules_to_fail
= i
;
1900 if (1 != sscanf(ref
, scanf_fmts
[i
], short_name
))
1903 short_name_len
= strlen(short_name
);
1906 * in strict mode, all (except the matched one) rules
1907 * must fail to resolve to a valid non-ambiguous ref
1910 rules_to_fail
= nr_rules
;
1913 * check if the short name resolves to a valid ref,
1914 * but use only rules prior to the matched one
1916 for (j
= 0; j
< rules_to_fail
; j
++) {
1917 const char *rule
= ref_rev_parse_rules
[j
];
1918 unsigned char short_objectname
[20];
1919 char refname
[PATH_MAX
];
1921 /* skip matched rule */
1926 * the short name is ambiguous, if it resolves
1927 * (with this previous rule) to a valid ref
1928 * read_ref() returns 0 on success
1930 mksnpath(refname
, sizeof(refname
),
1931 rule
, short_name_len
, short_name
);
1932 if (!read_ref(refname
, short_objectname
))
1937 * short name is non-ambiguous if all previous rules
1938 * haven't resolved to a valid ref
1940 if (j
== rules_to_fail
)
1945 return xstrdup(ref
);