7 /* ISSYMREF=01 and ISPACKED=02 are public interfaces */
8 #define REF_KNOWS_PEELED 04
12 unsigned char flag
; /* ISSYMREF? ISPACKED? */
13 unsigned char sha1
[20];
14 unsigned char peeled
[20];
15 char name
[FLEX_ARRAY
];
20 struct ref_entry
**refs
;
23 static const char *parse_ref_line(char *line
, unsigned char *sha1
)
26 * 42: the answer to everything.
28 * In this case, it happens to be the answer to
29 * 40 (length of sha1 hex representation)
30 * +1 (space in between hex and name)
31 * +1 (newline at the end of the line)
33 int len
= strlen(line
) - 42;
37 if (get_sha1_hex(line
, sha1
) < 0)
39 if (!isspace(line
[40]))
44 if (line
[len
] != '\n')
51 static void add_ref(const char *name
, const unsigned char *sha1
,
52 int flag
, struct ref_array
*refs
,
53 struct ref_entry
**new_entry
)
56 struct ref_entry
*entry
;
58 /* Allocate it and add it in.. */
59 len
= strlen(name
) + 1;
60 entry
= xmalloc(sizeof(struct ref_entry
) + len
);
61 hashcpy(entry
->sha1
, sha1
);
62 hashclr(entry
->peeled
);
63 memcpy(entry
->name
, name
, len
);
67 ALLOC_GROW(refs
->refs
, refs
->nr
+ 1, refs
->alloc
);
68 refs
->refs
[refs
->nr
++] = entry
;
71 static int ref_entry_cmp(const void *a
, const void *b
)
73 struct ref_entry
*one
= *(struct ref_entry
**)a
;
74 struct ref_entry
*two
= *(struct ref_entry
**)b
;
75 return strcmp(one
->name
, two
->name
);
78 static void sort_ref_array(struct ref_array
*array
)
82 /* Nothing to sort unless there are at least two entries */
86 qsort(array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
88 /* Remove any duplicates from the ref_array */
89 for (; j
< array
->nr
; j
++) {
90 struct ref_entry
*a
= array
->refs
[i
];
91 struct ref_entry
*b
= array
->refs
[j
];
92 if (!strcmp(a
->name
, b
->name
)) {
93 if (hashcmp(a
->sha1
, b
->sha1
))
94 die("Duplicated ref, and SHA1s don't match: %s",
96 warning("Duplicated ref: %s", a
->name
);
100 array
->refs
[i
] = array
->refs
[j
];
105 static struct ref_entry
*search_ref_array(struct ref_array
*array
, const char *name
)
107 struct ref_entry
*e
, **r
;
116 len
= strlen(name
) + 1;
117 e
= xmalloc(sizeof(struct ref_entry
) + len
);
118 memcpy(e
->name
, name
, len
);
120 r
= bsearch(&e
, array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
131 * Future: need to be in "struct repository"
132 * when doing a full libification.
134 static struct cached_refs
{
137 struct ref_array loose
;
138 struct ref_array packed
;
139 } cached_refs
, submodule_refs
;
140 static struct ref_entry
*current_ref
;
142 static struct ref_array extra_refs
;
144 static void free_ref_array(struct ref_array
*array
)
147 for (i
= 0; i
< array
->nr
; i
++)
148 free(array
->refs
[i
]);
150 array
->nr
= array
->alloc
= 0;
154 static void invalidate_cached_refs(void)
156 struct cached_refs
*ca
= &cached_refs
;
159 free_ref_array(&ca
->loose
);
161 free_ref_array(&ca
->packed
);
162 ca
->did_loose
= ca
->did_packed
= 0;
165 static void read_packed_refs(FILE *f
, struct cached_refs
*cached_refs
)
167 struct ref_entry
*last
= NULL
;
168 char refline
[PATH_MAX
];
169 int flag
= REF_ISPACKED
;
171 while (fgets(refline
, sizeof(refline
), f
)) {
172 unsigned char sha1
[20];
174 static const char header
[] = "# pack-refs with:";
176 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
177 const char *traits
= refline
+ sizeof(header
) - 1;
178 if (strstr(traits
, " peeled "))
179 flag
|= REF_KNOWS_PEELED
;
180 /* perhaps other traits later as well */
184 name
= parse_ref_line(refline
, sha1
);
186 add_ref(name
, sha1
, flag
, &cached_refs
->packed
, &last
);
191 strlen(refline
) == 42 &&
192 refline
[41] == '\n' &&
193 !get_sha1_hex(refline
+ 1, sha1
))
194 hashcpy(last
->peeled
, sha1
);
196 sort_ref_array(&cached_refs
->packed
);
199 void add_extra_ref(const char *name
, const unsigned char *sha1
, int flag
)
201 add_ref(name
, sha1
, flag
, &extra_refs
, NULL
);
204 void clear_extra_refs(void)
206 free_ref_array(&extra_refs
);
209 static struct ref_array
*get_packed_refs(const char *submodule
)
211 const char *packed_refs_file
;
212 struct cached_refs
*refs
;
215 packed_refs_file
= git_path_submodule(submodule
, "packed-refs");
216 refs
= &submodule_refs
;
217 free_ref_array(&refs
->packed
);
219 packed_refs_file
= git_path("packed-refs");
223 if (!refs
->did_packed
|| submodule
) {
224 FILE *f
= fopen(packed_refs_file
, "r");
226 read_packed_refs(f
, refs
);
229 refs
->did_packed
= 1;
231 return &refs
->packed
;
234 static void get_ref_dir(const char *submodule
, const char *base
,
235 struct ref_array
*array
)
241 path
= git_path_submodule(submodule
, "%s", base
);
243 path
= git_path("%s", base
);
250 int baselen
= strlen(base
);
251 char *ref
= xmalloc(baselen
+ 257);
253 memcpy(ref
, base
, baselen
);
254 if (baselen
&& base
[baselen
-1] != '/')
255 ref
[baselen
++] = '/';
257 while ((de
= readdir(dir
)) != NULL
) {
258 unsigned char sha1
[20];
264 if (de
->d_name
[0] == '.')
266 namelen
= strlen(de
->d_name
);
269 if (has_extension(de
->d_name
, ".lock"))
271 memcpy(ref
+ baselen
, de
->d_name
, namelen
+1);
273 ? git_path_submodule(submodule
, "%s", ref
)
274 : git_path("%s", ref
);
275 if (stat(refdir
, &st
) < 0)
277 if (S_ISDIR(st
.st_mode
)) {
278 get_ref_dir(submodule
, ref
, array
);
284 if (resolve_gitlink_ref(submodule
, ref
, sha1
) < 0) {
289 if (!resolve_ref(ref
, sha1
, 1, &flag
)) {
293 add_ref(ref
, sha1
, flag
, array
, NULL
);
300 struct warn_if_dangling_data
{
306 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
307 int flags
, void *cb_data
)
309 struct warn_if_dangling_data
*d
= cb_data
;
310 const char *resolves_to
;
311 unsigned char junk
[20];
313 if (!(flags
& REF_ISSYMREF
))
316 resolves_to
= resolve_ref(refname
, junk
, 0, NULL
);
317 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
320 fprintf(d
->fp
, d
->msg_fmt
, refname
);
324 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
326 struct warn_if_dangling_data data
;
329 data
.refname
= refname
;
330 data
.msg_fmt
= msg_fmt
;
331 for_each_rawref(warn_if_dangling_symref
, &data
);
334 static struct ref_array
*get_loose_refs(const char *submodule
)
337 free_ref_array(&submodule_refs
.loose
);
338 get_ref_dir(submodule
, "refs", &submodule_refs
.loose
);
339 sort_ref_array(&submodule_refs
.loose
);
340 return &submodule_refs
.loose
;
343 if (!cached_refs
.did_loose
) {
344 get_ref_dir(NULL
, "refs", &cached_refs
.loose
);
345 sort_ref_array(&cached_refs
.loose
);
346 cached_refs
.did_loose
= 1;
348 return &cached_refs
.loose
;
351 /* We allow "recursive" symbolic refs. Only within reason, though */
353 #define MAXREFLEN (1024)
355 static int resolve_gitlink_packed_ref(char *name
, int pathlen
, const char *refname
, unsigned char *result
)
358 struct cached_refs refs
;
359 struct ref_entry
*ref
;
362 strcpy(name
+ pathlen
, "packed-refs");
363 f
= fopen(name
, "r");
366 memset(&refs
, 0, sizeof(refs
));
367 read_packed_refs(f
, &refs
);
369 ref
= search_ref_array(&refs
.packed
, refname
);
371 memcpy(result
, ref
->sha1
, 20);
374 free_ref_array(&refs
.packed
);
378 static int resolve_gitlink_ref_recursive(char *name
, int pathlen
, const char *refname
, unsigned char *result
, int recursion
)
380 int fd
, len
= strlen(refname
);
381 char buffer
[128], *p
;
383 if (recursion
> MAXDEPTH
|| len
> MAXREFLEN
)
385 memcpy(name
+ pathlen
, refname
, len
+1);
386 fd
= open(name
, O_RDONLY
);
388 return resolve_gitlink_packed_ref(name
, pathlen
, refname
, result
);
390 len
= read(fd
, buffer
, sizeof(buffer
)-1);
394 while (len
&& isspace(buffer
[len
-1]))
398 /* Was it a detached head or an old-fashioned symlink? */
399 if (!get_sha1_hex(buffer
, result
))
403 if (strncmp(buffer
, "ref:", 4))
409 return resolve_gitlink_ref_recursive(name
, pathlen
, p
, result
, recursion
+1);
412 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *result
)
414 int len
= strlen(path
), retval
;
418 while (len
&& path
[len
-1] == '/')
422 gitdir
= xmalloc(len
+ MAXREFLEN
+ 8);
423 memcpy(gitdir
, path
, len
);
424 memcpy(gitdir
+ len
, "/.git", 6);
427 tmp
= read_gitfile_gently(gitdir
);
431 gitdir
= xmalloc(len
+ MAXREFLEN
+ 3);
432 memcpy(gitdir
, tmp
, len
);
435 gitdir
[++len
] = '\0';
436 retval
= resolve_gitlink_ref_recursive(gitdir
, len
, refname
, result
, 0);
442 * If the "reading" argument is set, this function finds out what _object_
443 * the ref points at by "reading" the ref. The ref, if it is not symbolic,
444 * has to exist, and if it is symbolic, it has to point at an existing ref,
445 * because the "read" goes through the symref to the ref it points at.
447 * The access that is not "reading" may often be "writing", but does not
448 * have to; it can be merely checking _where it leads to_. If it is a
449 * prelude to "writing" to the ref, a write to a symref that points at
450 * yet-to-be-born ref will create the real ref pointed by the symref.
451 * reading=0 allows the caller to check where such a symref leads to.
453 const char *resolve_ref(const char *ref
, unsigned char *sha1
, int reading
, int *flag
)
455 int depth
= MAXDEPTH
;
458 static char ref_buffer
[256];
472 git_snpath(path
, sizeof(path
), "%s", ref
);
473 /* Special case: non-existing file. */
474 if (lstat(path
, &st
) < 0) {
475 struct ref_array
*packed
= get_packed_refs(NULL
);
476 struct ref_entry
*r
= search_ref_array(packed
, ref
);
478 hashcpy(sha1
, r
->sha1
);
480 *flag
|= REF_ISPACKED
;
483 if (reading
|| errno
!= ENOENT
)
489 /* Follow "normalized" - ie "refs/.." symlinks by hand */
490 if (S_ISLNK(st
.st_mode
)) {
491 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
492 if (len
>= 5 && !memcmp("refs/", buffer
, 5)) {
494 strcpy(ref_buffer
, buffer
);
497 *flag
|= REF_ISSYMREF
;
502 /* Is it a directory? */
503 if (S_ISDIR(st
.st_mode
)) {
509 * Anything else, just open it and try to use it as
512 fd
= open(path
, O_RDONLY
);
515 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
519 * Is it a symbolic ref?
521 if (len
< 4 || memcmp("ref:", buffer
, 4))
525 while (len
&& isspace(*buf
))
527 while (len
&& isspace(buf
[len
-1]))
530 memcpy(ref_buffer
, buf
, len
+ 1);
533 *flag
|= REF_ISSYMREF
;
535 if (len
< 40 || get_sha1_hex(buffer
, sha1
))
540 /* The argument to filter_refs */
547 int read_ref(const char *ref
, unsigned char *sha1
)
549 if (resolve_ref(ref
, sha1
, 1, NULL
))
554 #define DO_FOR_EACH_INCLUDE_BROKEN 01
555 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
556 int flags
, void *cb_data
, struct ref_entry
*entry
)
558 if (strncmp(base
, entry
->name
, trim
))
561 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
562 if (entry
->flag
& REF_BROKEN
)
563 return 0; /* ignore dangling symref */
564 if (!has_sha1_file(entry
->sha1
)) {
565 error("%s does not point to a valid object!", entry
->name
);
570 return fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
573 static int filter_refs(const char *ref
, const unsigned char *sha
, int flags
,
576 struct ref_filter
*filter
= (struct ref_filter
*)data
;
577 if (fnmatch(filter
->pattern
, ref
, 0))
579 return filter
->fn(ref
, sha
, flags
, filter
->cb_data
);
582 int peel_ref(const char *ref
, unsigned char *sha1
)
585 unsigned char base
[20];
588 if (current_ref
&& (current_ref
->name
== ref
589 || !strcmp(current_ref
->name
, ref
))) {
590 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
591 hashcpy(sha1
, current_ref
->peeled
);
594 hashcpy(base
, current_ref
->sha1
);
598 if (!resolve_ref(ref
, base
, 1, &flag
))
601 if ((flag
& REF_ISPACKED
)) {
602 struct ref_array
*array
= get_packed_refs(NULL
);
603 struct ref_entry
*r
= search_ref_array(array
, ref
);
605 if (r
!= NULL
&& r
->flag
& REF_KNOWS_PEELED
) {
606 hashcpy(sha1
, r
->peeled
);
612 o
= parse_object(base
);
613 if (o
&& o
->type
== OBJ_TAG
) {
614 o
= deref_tag(o
, ref
, 0);
616 hashcpy(sha1
, o
->sha1
);
623 static int do_for_each_ref(const char *submodule
, const char *base
, each_ref_fn fn
,
624 int trim
, int flags
, void *cb_data
)
626 int retval
= 0, i
, p
= 0, l
= 0;
627 struct ref_array
*packed
= get_packed_refs(submodule
);
628 struct ref_array
*loose
= get_loose_refs(submodule
);
630 struct ref_array
*extra
= &extra_refs
;
632 for (i
= 0; i
< extra
->nr
; i
++)
633 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, extra
->refs
[i
]);
635 while (p
< packed
->nr
&& l
< loose
->nr
) {
636 struct ref_entry
*entry
;
637 int cmp
= strcmp(packed
->refs
[p
]->name
, loose
->refs
[l
]->name
);
643 entry
= loose
->refs
[l
++];
645 entry
= packed
->refs
[p
++];
647 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, entry
);
657 for (; p
< packed
->nr
; p
++) {
658 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, packed
->refs
[p
]);
669 static int do_head_ref(const char *submodule
, each_ref_fn fn
, void *cb_data
)
671 unsigned char sha1
[20];
675 if (resolve_gitlink_ref(submodule
, "HEAD", sha1
) == 0)
676 return fn("HEAD", sha1
, 0, cb_data
);
681 if (resolve_ref("HEAD", sha1
, 1, &flag
))
682 return fn("HEAD", sha1
, flag
, cb_data
);
687 int head_ref(each_ref_fn fn
, void *cb_data
)
689 return do_head_ref(NULL
, fn
, cb_data
);
692 int head_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
694 return do_head_ref(submodule
, fn
, cb_data
);
697 int for_each_ref(each_ref_fn fn
, void *cb_data
)
699 return do_for_each_ref(NULL
, "refs/", fn
, 0, 0, cb_data
);
702 int for_each_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
704 return do_for_each_ref(submodule
, "refs/", fn
, 0, 0, cb_data
);
707 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
709 return do_for_each_ref(NULL
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
712 int for_each_ref_in_submodule(const char *submodule
, const char *prefix
,
713 each_ref_fn fn
, void *cb_data
)
715 return do_for_each_ref(submodule
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
718 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
720 return for_each_ref_in("refs/tags/", fn
, cb_data
);
723 int for_each_tag_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
725 return for_each_ref_in_submodule(submodule
, "refs/tags/", fn
, cb_data
);
728 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
730 return for_each_ref_in("refs/heads/", fn
, cb_data
);
733 int for_each_branch_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
735 return for_each_ref_in_submodule(submodule
, "refs/heads/", fn
, cb_data
);
738 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
740 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
743 int for_each_remote_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
745 return for_each_ref_in_submodule(submodule
, "refs/remotes/", fn
, cb_data
);
748 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
750 return do_for_each_ref(NULL
, "refs/replace/", fn
, 13, 0, cb_data
);
753 int for_each_glob_ref_in(each_ref_fn fn
, const char *pattern
,
754 const char *prefix
, void *cb_data
)
756 struct strbuf real_pattern
= STRBUF_INIT
;
757 struct ref_filter filter
;
760 if (!prefix
&& prefixcmp(pattern
, "refs/"))
761 strbuf_addstr(&real_pattern
, "refs/");
763 strbuf_addstr(&real_pattern
, prefix
);
764 strbuf_addstr(&real_pattern
, pattern
);
766 if (!has_glob_specials(pattern
)) {
767 /* Append implied '/' '*' if not present. */
768 if (real_pattern
.buf
[real_pattern
.len
- 1] != '/')
769 strbuf_addch(&real_pattern
, '/');
770 /* No need to check for '*', there is none. */
771 strbuf_addch(&real_pattern
, '*');
774 filter
.pattern
= real_pattern
.buf
;
776 filter
.cb_data
= cb_data
;
777 ret
= for_each_ref(filter_refs
, &filter
);
779 strbuf_release(&real_pattern
);
783 int for_each_glob_ref(each_ref_fn fn
, const char *pattern
, void *cb_data
)
785 return for_each_glob_ref_in(fn
, pattern
, NULL
, cb_data
);
788 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
790 return do_for_each_ref(NULL
, "refs/", fn
, 0,
791 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
795 * Make sure "ref" is something reasonable to have under ".git/refs/";
796 * We do not like it if:
798 * - any path component of it begins with ".", or
799 * - it has double dots "..", or
800 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
801 * - it ends with a "/".
802 * - it ends with ".lock"
803 * - it contains a "\" (backslash)
806 static inline int bad_ref_char(int ch
)
808 if (((unsigned) ch
) <= ' ' ||
809 ch
== '~' || ch
== '^' || ch
== ':' || ch
== '\\')
811 /* 2.13 Pattern Matching Notation */
812 if (ch
== '?' || ch
== '[') /* Unsupported */
814 if (ch
== '*') /* Supported at the end */
819 int check_ref_format(const char *ref
)
821 int ch
, level
, bad_type
, last
;
822 int ret
= CHECK_REF_FORMAT_OK
;
823 const char *cp
= ref
;
827 while ((ch
= *cp
++) == '/')
828 ; /* tolerate duplicated slashes */
830 /* should not end with slashes */
831 return CHECK_REF_FORMAT_ERROR
;
833 /* we are at the beginning of the path component */
835 return CHECK_REF_FORMAT_ERROR
;
836 bad_type
= bad_ref_char(ch
);
838 if (bad_type
== 2 && (!*cp
|| *cp
== '/') &&
839 ret
== CHECK_REF_FORMAT_OK
)
840 ret
= CHECK_REF_FORMAT_WILDCARD
;
842 return CHECK_REF_FORMAT_ERROR
;
846 /* scan the rest of the path component */
847 while ((ch
= *cp
++) != 0) {
848 bad_type
= bad_ref_char(ch
);
850 return CHECK_REF_FORMAT_ERROR
;
853 if (last
== '.' && ch
== '.')
854 return CHECK_REF_FORMAT_ERROR
;
855 if (last
== '@' && ch
== '{')
856 return CHECK_REF_FORMAT_ERROR
;
861 if (ref
<= cp
- 2 && cp
[-2] == '.')
862 return CHECK_REF_FORMAT_ERROR
;
864 return CHECK_REF_FORMAT_ONELEVEL
;
865 if (has_extension(ref
, ".lock"))
866 return CHECK_REF_FORMAT_ERROR
;
872 const char *prettify_refname(const char *name
)
875 !prefixcmp(name
, "refs/heads/") ? 11 :
876 !prefixcmp(name
, "refs/tags/") ? 10 :
877 !prefixcmp(name
, "refs/remotes/") ? 13 :
881 const char *ref_rev_parse_rules
[] = {
887 "refs/remotes/%.*s/HEAD",
891 const char *ref_fetch_rules
[] = {
898 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
901 const int abbrev_name_len
= strlen(abbrev_name
);
903 for (p
= rules
; *p
; p
++) {
904 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
912 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
913 const unsigned char *old_sha1
, int mustexist
)
915 if (!resolve_ref(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
916 error("Can't verify ref %s", lock
->ref_name
);
920 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
921 error("Ref %s is at %s but expected %s", lock
->ref_name
,
922 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
929 static int remove_empty_directories(const char *file
)
931 /* we want to create a file but there is a directory there;
932 * if that is an empty directory (or a directory that contains
933 * only empty directories), remove them.
938 strbuf_init(&path
, 20);
939 strbuf_addstr(&path
, file
);
941 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
943 strbuf_release(&path
);
948 static int is_refname_available(const char *ref
, const char *oldref
,
949 struct ref_array
*array
, int quiet
)
951 int i
, namlen
= strlen(ref
); /* e.g. 'foo/bar' */
952 for (i
= 0; i
< array
->nr
; i
++ ) {
953 struct ref_entry
*entry
= array
->refs
[i
];
954 /* entry->name could be 'foo' or 'foo/bar/baz' */
955 if (!oldref
|| strcmp(oldref
, entry
->name
)) {
956 int len
= strlen(entry
->name
);
957 int cmplen
= (namlen
< len
) ? namlen
: len
;
958 const char *lead
= (namlen
< len
) ? entry
->name
: ref
;
959 if (!strncmp(ref
, entry
->name
, cmplen
) &&
960 lead
[cmplen
] == '/') {
962 error("'%s' exists; cannot create '%s'",
971 static struct ref_lock
*lock_ref_sha1_basic(const char *ref
, const unsigned char *old_sha1
, int flags
, int *type_p
)
974 const char *orig_ref
= ref
;
975 struct ref_lock
*lock
;
978 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
981 lock
= xcalloc(1, sizeof(struct ref_lock
));
984 ref
= resolve_ref(ref
, lock
->old_sha1
, mustexist
, &type
);
985 if (!ref
&& errno
== EISDIR
) {
986 /* we are trying to lock foo but we used to
987 * have foo/bar which now does not exist;
988 * it is normal for the empty directory 'foo'
991 ref_file
= git_path("%s", orig_ref
);
992 if (remove_empty_directories(ref_file
)) {
994 error("there are still refs under '%s'", orig_ref
);
997 ref
= resolve_ref(orig_ref
, lock
->old_sha1
, mustexist
, &type
);
1003 error("unable to resolve reference %s: %s",
1004 orig_ref
, strerror(errno
));
1007 missing
= is_null_sha1(lock
->old_sha1
);
1008 /* When the ref did not exist and we are creating it,
1009 * make sure there is no existing ref that is packed
1010 * whose name begins with our refname, nor a ref whose
1011 * name is a proper prefix of our refname.
1014 !is_refname_available(ref
, NULL
, get_packed_refs(NULL
), 0)) {
1015 last_errno
= ENOTDIR
;
1019 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1021 lflags
= LOCK_DIE_ON_ERROR
;
1022 if (flags
& REF_NODEREF
) {
1024 lflags
|= LOCK_NODEREF
;
1026 lock
->ref_name
= xstrdup(ref
);
1027 lock
->orig_ref_name
= xstrdup(orig_ref
);
1028 ref_file
= git_path("%s", ref
);
1030 lock
->force_write
= 1;
1031 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
1032 lock
->force_write
= 1;
1034 if (safe_create_leading_directories(ref_file
)) {
1036 error("unable to create directory for %s", ref_file
);
1040 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
1041 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
1049 struct ref_lock
*lock_ref_sha1(const char *ref
, const unsigned char *old_sha1
)
1051 char refpath
[PATH_MAX
];
1052 if (check_ref_format(ref
))
1054 strcpy(refpath
, mkpath("refs/%s", ref
));
1055 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
1058 struct ref_lock
*lock_any_ref_for_update(const char *ref
, const unsigned char *old_sha1
, int flags
)
1060 switch (check_ref_format(ref
)) {
1064 case CHECK_REF_FORMAT_ONELEVEL
:
1065 return lock_ref_sha1_basic(ref
, old_sha1
, flags
, NULL
);
1069 static struct lock_file packlock
;
1071 static int repack_without_ref(const char *refname
)
1073 struct ref_array
*packed
;
1074 struct ref_entry
*ref
;
1077 packed
= get_packed_refs(NULL
);
1078 ref
= search_ref_array(packed
, refname
);
1081 fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
1083 unable_to_lock_error(git_path("packed-refs"), errno
);
1084 return error("cannot delete '%s' from packed refs", refname
);
1087 for (i
= 0; i
< packed
->nr
; i
++) {
1088 char line
[PATH_MAX
+ 100];
1091 ref
= packed
->refs
[i
];
1093 if (!strcmp(refname
, ref
->name
))
1095 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1096 sha1_to_hex(ref
->sha1
), ref
->name
);
1097 /* this should not happen but just being defensive */
1098 if (len
> sizeof(line
))
1099 die("too long a refname '%s'", ref
->name
);
1100 write_or_die(fd
, line
, len
);
1102 return commit_lock_file(&packlock
);
1105 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1107 struct ref_lock
*lock
;
1108 int err
, i
= 0, ret
= 0, flag
= 0;
1110 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1113 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1117 if (!(delopt
& REF_NODEREF
)) {
1118 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1119 lock
->lk
->filename
[i
] = 0;
1120 path
= lock
->lk
->filename
;
1122 path
= git_path("%s", refname
);
1124 err
= unlink_or_warn(path
);
1125 if (err
&& errno
!= ENOENT
)
1128 if (!(delopt
& REF_NODEREF
))
1129 lock
->lk
->filename
[i
] = '.';
1131 /* removing the loose one could have resurrected an earlier
1132 * packed one. Also, if it was not loose we need to repack
1135 ret
|= repack_without_ref(refname
);
1137 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1138 invalidate_cached_refs();
1144 * People using contrib's git-new-workdir have .git/logs/refs ->
1145 * /some/other/path/.git/logs/refs, and that may live on another device.
1147 * IOW, to avoid cross device rename errors, the temporary renamed log must
1148 * live into logs/refs.
1150 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1152 int rename_ref(const char *oldref
, const char *newref
, const char *logmsg
)
1154 static const char renamed_ref
[] = "RENAMED-REF";
1155 unsigned char sha1
[20], orig_sha1
[20];
1156 int flag
= 0, logmoved
= 0;
1157 struct ref_lock
*lock
;
1158 struct stat loginfo
;
1159 int log
= !lstat(git_path("logs/%s", oldref
), &loginfo
);
1160 const char *symref
= NULL
;
1162 if (log
&& S_ISLNK(loginfo
.st_mode
))
1163 return error("reflog for %s is a symlink", oldref
);
1165 symref
= resolve_ref(oldref
, orig_sha1
, 1, &flag
);
1166 if (flag
& REF_ISSYMREF
)
1167 return error("refname %s is a symbolic ref, renaming it is not supported",
1170 return error("refname %s not found", oldref
);
1172 if (!is_refname_available(newref
, oldref
, get_packed_refs(NULL
), 0))
1175 if (!is_refname_available(newref
, oldref
, get_loose_refs(NULL
), 0))
1178 lock
= lock_ref_sha1_basic(renamed_ref
, NULL
, 0, NULL
);
1180 return error("unable to lock %s", renamed_ref
);
1181 lock
->force_write
= 1;
1182 if (write_ref_sha1(lock
, orig_sha1
, logmsg
))
1183 return error("unable to save current sha1 in %s", renamed_ref
);
1185 if (log
&& rename(git_path("logs/%s", oldref
), git_path(TMP_RENAMED_LOG
)))
1186 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG
": %s",
1187 oldref
, strerror(errno
));
1189 if (delete_ref(oldref
, orig_sha1
, REF_NODEREF
)) {
1190 error("unable to delete old %s", oldref
);
1194 if (resolve_ref(newref
, sha1
, 1, &flag
) && delete_ref(newref
, sha1
, REF_NODEREF
)) {
1195 if (errno
==EISDIR
) {
1196 if (remove_empty_directories(git_path("%s", newref
))) {
1197 error("Directory not empty: %s", newref
);
1201 error("unable to delete existing %s", newref
);
1206 if (log
&& safe_create_leading_directories(git_path("logs/%s", newref
))) {
1207 error("unable to create directory for %s", newref
);
1212 if (log
&& rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", newref
))) {
1213 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1215 * rename(a, b) when b is an existing
1216 * directory ought to result in ISDIR, but
1217 * Solaris 5.8 gives ENOTDIR. Sheesh.
1219 if (remove_empty_directories(git_path("logs/%s", newref
))) {
1220 error("Directory not empty: logs/%s", newref
);
1225 error("unable to move logfile "TMP_RENAMED_LOG
" to logs/%s: %s",
1226 newref
, strerror(errno
));
1232 lock
= lock_ref_sha1_basic(newref
, NULL
, 0, NULL
);
1234 error("unable to lock %s for update", newref
);
1237 lock
->force_write
= 1;
1238 hashcpy(lock
->old_sha1
, orig_sha1
);
1239 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1240 error("unable to write current sha1 into %s", newref
);
1247 lock
= lock_ref_sha1_basic(oldref
, NULL
, 0, NULL
);
1249 error("unable to lock %s for rollback", oldref
);
1253 lock
->force_write
= 1;
1254 flag
= log_all_ref_updates
;
1255 log_all_ref_updates
= 0;
1256 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1257 error("unable to write current sha1 into %s", oldref
);
1258 log_all_ref_updates
= flag
;
1261 if (logmoved
&& rename(git_path("logs/%s", newref
), git_path("logs/%s", oldref
)))
1262 error("unable to restore logfile %s from %s: %s",
1263 oldref
, newref
, strerror(errno
));
1264 if (!logmoved
&& log
&&
1265 rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", oldref
)))
1266 error("unable to restore logfile %s from "TMP_RENAMED_LOG
": %s",
1267 oldref
, strerror(errno
));
1272 int close_ref(struct ref_lock
*lock
)
1274 if (close_lock_file(lock
->lk
))
1280 int commit_ref(struct ref_lock
*lock
)
1282 if (commit_lock_file(lock
->lk
))
1288 void unlock_ref(struct ref_lock
*lock
)
1290 /* Do not free lock->lk -- atexit() still looks at them */
1292 rollback_lock_file(lock
->lk
);
1293 free(lock
->ref_name
);
1294 free(lock
->orig_ref_name
);
1299 * copy the reflog message msg to buf, which has been allocated sufficiently
1300 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1301 * because reflog file is one line per entry.
1303 static int copy_msg(char *buf
, const char *msg
)
1310 while ((c
= *msg
++)) {
1311 if (wasspace
&& isspace(c
))
1313 wasspace
= isspace(c
);
1318 while (buf
< cp
&& isspace(cp
[-1]))
1324 int log_ref_setup(const char *ref_name
, char *logfile
, int bufsize
)
1326 int logfd
, oflags
= O_APPEND
| O_WRONLY
;
1328 git_snpath(logfile
, bufsize
, "logs/%s", ref_name
);
1329 if (log_all_ref_updates
&&
1330 (!prefixcmp(ref_name
, "refs/heads/") ||
1331 !prefixcmp(ref_name
, "refs/remotes/") ||
1332 !prefixcmp(ref_name
, "refs/notes/") ||
1333 !strcmp(ref_name
, "HEAD"))) {
1334 if (safe_create_leading_directories(logfile
) < 0)
1335 return error("unable to create directory for %s",
1340 logfd
= open(logfile
, oflags
, 0666);
1342 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1345 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1346 if (remove_empty_directories(logfile
)) {
1347 return error("There are still logs under '%s'",
1350 logfd
= open(logfile
, oflags
, 0666);
1354 return error("Unable to append to %s: %s",
1355 logfile
, strerror(errno
));
1358 adjust_shared_perm(logfile
);
1363 static int log_ref_write(const char *ref_name
, const unsigned char *old_sha1
,
1364 const unsigned char *new_sha1
, const char *msg
)
1366 int logfd
, result
, written
, oflags
= O_APPEND
| O_WRONLY
;
1367 unsigned maxlen
, len
;
1369 char log_file
[PATH_MAX
];
1371 const char *committer
;
1373 if (log_all_ref_updates
< 0)
1374 log_all_ref_updates
= !is_bare_repository();
1376 result
= log_ref_setup(ref_name
, log_file
, sizeof(log_file
));
1380 logfd
= open(log_file
, oflags
);
1383 msglen
= msg
? strlen(msg
) : 0;
1384 committer
= git_committer_info(0);
1385 maxlen
= strlen(committer
) + msglen
+ 100;
1386 logrec
= xmalloc(maxlen
);
1387 len
= sprintf(logrec
, "%s %s %s\n",
1388 sha1_to_hex(old_sha1
),
1389 sha1_to_hex(new_sha1
),
1392 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1393 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1395 if (close(logfd
) != 0 || written
!= len
)
1396 return error("Unable to append to %s", log_file
);
1400 static int is_branch(const char *refname
)
1402 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1405 int write_ref_sha1(struct ref_lock
*lock
,
1406 const unsigned char *sha1
, const char *logmsg
)
1408 static char term
= '\n';
1413 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1417 o
= parse_object(sha1
);
1419 error("Trying to write ref %s with nonexistant object %s",
1420 lock
->ref_name
, sha1_to_hex(sha1
));
1424 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1425 error("Trying to write non-commit object %s to branch %s",
1426 sha1_to_hex(sha1
), lock
->ref_name
);
1430 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1431 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1432 || close_ref(lock
) < 0) {
1433 error("Couldn't write %s", lock
->lk
->filename
);
1437 invalidate_cached_refs();
1438 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1439 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1440 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1444 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1446 * Special hack: If a branch is updated directly and HEAD
1447 * points to it (may happen on the remote side of a push
1448 * for example) then logically the HEAD reflog should be
1450 * A generic solution implies reverse symref information,
1451 * but finding all symrefs pointing to the given branch
1452 * would be rather costly for this rare event (the direct
1453 * update of a branch) to be worth it. So let's cheat and
1454 * check with HEAD only which should cover 99% of all usage
1455 * scenarios (even 100% of the default ones).
1457 unsigned char head_sha1
[20];
1459 const char *head_ref
;
1460 head_ref
= resolve_ref("HEAD", head_sha1
, 1, &head_flag
);
1461 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1462 !strcmp(head_ref
, lock
->ref_name
))
1463 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1465 if (commit_ref(lock
)) {
1466 error("Couldn't set %s", lock
->ref_name
);
1474 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1477 const char *lockpath
;
1479 int fd
, len
, written
;
1480 char *git_HEAD
= git_pathdup("%s", ref_target
);
1481 unsigned char old_sha1
[20], new_sha1
[20];
1483 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1486 if (safe_create_leading_directories(git_HEAD
) < 0)
1487 return error("unable to create directory for %s", git_HEAD
);
1489 #ifndef NO_SYMLINK_HEAD
1490 if (prefer_symlink_refs
) {
1492 if (!symlink(refs_heads_master
, git_HEAD
))
1494 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1498 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1499 if (sizeof(ref
) <= len
) {
1500 error("refname too long: %s", refs_heads_master
);
1501 goto error_free_return
;
1503 lockpath
= mkpath("%s.lock", git_HEAD
);
1504 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1506 error("Unable to open %s for writing", lockpath
);
1507 goto error_free_return
;
1509 written
= write_in_full(fd
, ref
, len
);
1510 if (close(fd
) != 0 || written
!= len
) {
1511 error("Unable to write to %s", lockpath
);
1512 goto error_unlink_return
;
1514 if (rename(lockpath
, git_HEAD
) < 0) {
1515 error("Unable to create %s", git_HEAD
);
1516 goto error_unlink_return
;
1518 if (adjust_shared_perm(git_HEAD
)) {
1519 error("Unable to fix permissions on %s", lockpath
);
1520 error_unlink_return
:
1521 unlink_or_warn(lockpath
);
1527 #ifndef NO_SYMLINK_HEAD
1530 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1531 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1537 static char *ref_msg(const char *line
, const char *endp
)
1541 ep
= memchr(line
, '\n', endp
- line
);
1544 return xmemdupz(line
, ep
- line
);
1547 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
)
1549 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1551 int logfd
, tz
, reccnt
= 0;
1554 unsigned char logged_sha1
[20];
1558 logfile
= git_path("logs/%s", ref
);
1559 logfd
= open(logfile
, O_RDONLY
, 0);
1561 die_errno("Unable to read log '%s'", logfile
);
1564 die("Log %s is empty.", logfile
);
1565 mapsz
= xsize_t(st
.st_size
);
1566 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1567 logdata
= log_mapped
;
1571 rec
= logend
= logdata
+ st
.st_size
;
1572 while (logdata
< rec
) {
1574 if (logdata
< rec
&& *(rec
-1) == '\n')
1577 while (logdata
< rec
&& *(rec
-1) != '\n') {
1583 die("Log %s is corrupt.", logfile
);
1584 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1585 if (date
<= at_time
|| cnt
== 0) {
1586 tz
= strtoul(tz_c
, NULL
, 10);
1588 *msg
= ref_msg(rec
, logend
);
1590 *cutoff_time
= date
;
1594 *cutoff_cnt
= reccnt
- 1;
1596 if (get_sha1_hex(lastrec
, logged_sha1
))
1597 die("Log %s is corrupt.", logfile
);
1598 if (get_sha1_hex(rec
+ 41, sha1
))
1599 die("Log %s is corrupt.", logfile
);
1600 if (hashcmp(logged_sha1
, sha1
)) {
1601 warning("Log %s has gap after %s.",
1602 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1605 else if (date
== at_time
) {
1606 if (get_sha1_hex(rec
+ 41, sha1
))
1607 die("Log %s is corrupt.", logfile
);
1610 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1611 die("Log %s is corrupt.", logfile
);
1612 if (hashcmp(logged_sha1
, sha1
)) {
1613 warning("Log %s unexpectedly ended on %s.",
1614 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1617 munmap(log_mapped
, mapsz
);
1626 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1628 if (rec
== logend
|| *rec
== '\n')
1629 die("Log %s is corrupt.", logfile
);
1630 date
= strtoul(rec
+ 1, &tz_c
, 10);
1631 tz
= strtoul(tz_c
, NULL
, 10);
1632 if (get_sha1_hex(logdata
, sha1
))
1633 die("Log %s is corrupt.", logfile
);
1634 if (is_null_sha1(sha1
)) {
1635 if (get_sha1_hex(logdata
+ 41, sha1
))
1636 die("Log %s is corrupt.", logfile
);
1639 *msg
= ref_msg(logdata
, logend
);
1640 munmap(log_mapped
, mapsz
);
1643 *cutoff_time
= date
;
1647 *cutoff_cnt
= reccnt
;
1651 int for_each_recent_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1653 const char *logfile
;
1655 struct strbuf sb
= STRBUF_INIT
;
1658 logfile
= git_path("logs/%s", ref
);
1659 logfp
= fopen(logfile
, "r");
1664 struct stat statbuf
;
1665 if (fstat(fileno(logfp
), &statbuf
) ||
1666 statbuf
.st_size
< ofs
||
1667 fseek(logfp
, -ofs
, SEEK_END
) ||
1668 strbuf_getwholeline(&sb
, logfp
, '\n')) {
1670 strbuf_release(&sb
);
1675 while (!strbuf_getwholeline(&sb
, logfp
, '\n')) {
1676 unsigned char osha1
[20], nsha1
[20];
1677 char *email_end
, *message
;
1678 unsigned long timestamp
;
1681 /* old SP new SP name <email> SP time TAB msg LF */
1682 if (sb
.len
< 83 || sb
.buf
[sb
.len
- 1] != '\n' ||
1683 get_sha1_hex(sb
.buf
, osha1
) || sb
.buf
[40] != ' ' ||
1684 get_sha1_hex(sb
.buf
+ 41, nsha1
) || sb
.buf
[81] != ' ' ||
1685 !(email_end
= strchr(sb
.buf
+ 82, '>')) ||
1686 email_end
[1] != ' ' ||
1687 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1688 !message
|| message
[0] != ' ' ||
1689 (message
[1] != '+' && message
[1] != '-') ||
1690 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1691 !isdigit(message
[4]) || !isdigit(message
[5]))
1692 continue; /* corrupt? */
1693 email_end
[1] = '\0';
1694 tz
= strtol(message
+ 1, NULL
, 10);
1695 if (message
[6] != '\t')
1699 ret
= fn(osha1
, nsha1
, sb
.buf
+ 82, timestamp
, tz
, message
,
1705 strbuf_release(&sb
);
1709 int for_each_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, void *cb_data
)
1711 return for_each_recent_reflog_ent(ref
, fn
, 0, cb_data
);
1714 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
1716 DIR *dir
= opendir(git_path("logs/%s", base
));
1721 int baselen
= strlen(base
);
1722 char *log
= xmalloc(baselen
+ 257);
1724 memcpy(log
, base
, baselen
);
1725 if (baselen
&& base
[baselen
-1] != '/')
1726 log
[baselen
++] = '/';
1728 while ((de
= readdir(dir
)) != NULL
) {
1732 if (de
->d_name
[0] == '.')
1734 namelen
= strlen(de
->d_name
);
1737 if (has_extension(de
->d_name
, ".lock"))
1739 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
1740 if (stat(git_path("logs/%s", log
), &st
) < 0)
1742 if (S_ISDIR(st
.st_mode
)) {
1743 retval
= do_for_each_reflog(log
, fn
, cb_data
);
1745 unsigned char sha1
[20];
1746 if (!resolve_ref(log
, sha1
, 0, NULL
))
1747 retval
= error("bad ref for %s", log
);
1749 retval
= fn(log
, sha1
, 0, cb_data
);
1762 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
1764 return do_for_each_reflog("", fn
, cb_data
);
1767 int update_ref(const char *action
, const char *refname
,
1768 const unsigned char *sha1
, const unsigned char *oldval
,
1769 int flags
, enum action_on_err onerr
)
1771 static struct ref_lock
*lock
;
1772 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
1774 const char *str
= "Cannot lock the ref '%s'.";
1776 case MSG_ON_ERR
: error(str
, refname
); break;
1777 case DIE_ON_ERR
: die(str
, refname
); break;
1778 case QUIET_ON_ERR
: break;
1782 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
1783 const char *str
= "Cannot update the ref '%s'.";
1785 case MSG_ON_ERR
: error(str
, refname
); break;
1786 case DIE_ON_ERR
: die(str
, refname
); break;
1787 case QUIET_ON_ERR
: break;
1794 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
1796 for ( ; list
; list
= list
->next
)
1797 if (!strcmp(list
->name
, name
))
1798 return (struct ref
*)list
;
1803 * generate a format suitable for scanf from a ref_rev_parse_rules
1804 * rule, that is replace the "%.*s" spec with a "%s" spec
1806 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
1810 spec
= strstr(rule
, "%.*s");
1811 if (!spec
|| strstr(spec
+ 4, "%.*s"))
1812 die("invalid rule in ref_rev_parse_rules: %s", rule
);
1814 /* copy all until spec */
1815 strncpy(scanf_fmt
, rule
, spec
- rule
);
1816 scanf_fmt
[spec
- rule
] = '\0';
1818 strcat(scanf_fmt
, "%s");
1819 /* copy remaining rule */
1820 strcat(scanf_fmt
, spec
+ 4);
1825 char *shorten_unambiguous_ref(const char *ref
, int strict
)
1828 static char **scanf_fmts
;
1829 static int nr_rules
;
1832 /* pre generate scanf formats from ref_rev_parse_rules[] */
1834 size_t total_len
= 0;
1836 /* the rule list is NULL terminated, count them first */
1837 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
1838 /* no +1 because strlen("%s") < strlen("%.*s") */
1839 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
1841 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
1844 for (i
= 0; i
< nr_rules
; i
++) {
1845 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
1847 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
1848 total_len
+= strlen(ref_rev_parse_rules
[i
]);
1852 /* bail out if there are no rules */
1854 return xstrdup(ref
);
1856 /* buffer for scanf result, at most ref must fit */
1857 short_name
= xstrdup(ref
);
1859 /* skip first rule, it will always match */
1860 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
1862 int rules_to_fail
= i
;
1865 if (1 != sscanf(ref
, scanf_fmts
[i
], short_name
))
1868 short_name_len
= strlen(short_name
);
1871 * in strict mode, all (except the matched one) rules
1872 * must fail to resolve to a valid non-ambiguous ref
1875 rules_to_fail
= nr_rules
;
1878 * check if the short name resolves to a valid ref,
1879 * but use only rules prior to the matched one
1881 for (j
= 0; j
< rules_to_fail
; j
++) {
1882 const char *rule
= ref_rev_parse_rules
[j
];
1883 unsigned char short_objectname
[20];
1884 char refname
[PATH_MAX
];
1886 /* skip matched rule */
1891 * the short name is ambiguous, if it resolves
1892 * (with this previous rule) to a valid ref
1893 * read_ref() returns 0 on success
1895 mksnpath(refname
, sizeof(refname
),
1896 rule
, short_name_len
, short_name
);
1897 if (!read_ref(refname
, short_objectname
))
1902 * short name is non-ambiguous if all previous rules
1903 * haven't resolved to a valid ref
1905 if (j
== rules_to_fail
)
1910 return xstrdup(ref
);