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
;
113 len
= strlen(name
) + 1;
114 e
= xmalloc(sizeof(struct ref_entry
) + len
);
115 memcpy(e
->name
, name
, len
);
117 r
= bsearch(&e
, array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
128 * Future: need to be in "struct repository"
129 * when doing a full libification.
131 static struct cached_refs
{
134 struct ref_array loose
;
135 struct ref_array packed
;
136 } cached_refs
, submodule_refs
;
137 static struct ref_entry
*current_ref
;
139 static struct ref_array extra_refs
;
141 static void free_ref_array(struct ref_array
*array
)
144 for (i
= 0; i
< array
->nr
; i
++)
145 free(array
->refs
[i
]);
147 array
->nr
= array
->alloc
= 0;
151 static void invalidate_cached_refs(void)
153 struct cached_refs
*ca
= &cached_refs
;
156 free_ref_array(&ca
->loose
);
158 free_ref_array(&ca
->packed
);
159 ca
->did_loose
= ca
->did_packed
= 0;
162 static void read_packed_refs(FILE *f
, struct cached_refs
*cached_refs
)
164 struct ref_entry
*last
= NULL
;
165 char refline
[PATH_MAX
];
166 int flag
= REF_ISPACKED
;
168 while (fgets(refline
, sizeof(refline
), f
)) {
169 unsigned char sha1
[20];
171 static const char header
[] = "# pack-refs with:";
173 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
174 const char *traits
= refline
+ sizeof(header
) - 1;
175 if (strstr(traits
, " peeled "))
176 flag
|= REF_KNOWS_PEELED
;
177 /* perhaps other traits later as well */
181 name
= parse_ref_line(refline
, sha1
);
183 add_ref(name
, sha1
, flag
, &cached_refs
->packed
, &last
);
188 strlen(refline
) == 42 &&
189 refline
[41] == '\n' &&
190 !get_sha1_hex(refline
+ 1, sha1
))
191 hashcpy(last
->peeled
, sha1
);
193 sort_ref_array(&cached_refs
->packed
);
196 void add_extra_ref(const char *name
, const unsigned char *sha1
, int flag
)
198 add_ref(name
, sha1
, flag
, &extra_refs
, NULL
);
201 void clear_extra_refs(void)
203 free_ref_array(&extra_refs
);
206 static struct ref_array
*get_packed_refs(const char *submodule
)
208 const char *packed_refs_file
;
209 struct cached_refs
*refs
;
212 packed_refs_file
= git_path_submodule(submodule
, "packed-refs");
213 refs
= &submodule_refs
;
214 free_ref_array(&refs
->packed
);
216 packed_refs_file
= git_path("packed-refs");
220 if (!refs
->did_packed
|| submodule
) {
221 FILE *f
= fopen(packed_refs_file
, "r");
223 read_packed_refs(f
, refs
);
226 refs
->did_packed
= 1;
228 return &refs
->packed
;
231 static void get_ref_dir(const char *submodule
, const char *base
,
232 struct ref_array
*array
)
238 path
= git_path_submodule(submodule
, "%s", base
);
240 path
= git_path("%s", base
);
247 int baselen
= strlen(base
);
248 char *ref
= xmalloc(baselen
+ 257);
250 memcpy(ref
, base
, baselen
);
251 if (baselen
&& base
[baselen
-1] != '/')
252 ref
[baselen
++] = '/';
254 while ((de
= readdir(dir
)) != NULL
) {
255 unsigned char sha1
[20];
261 if (de
->d_name
[0] == '.')
263 namelen
= strlen(de
->d_name
);
266 if (has_extension(de
->d_name
, ".lock"))
268 memcpy(ref
+ baselen
, de
->d_name
, namelen
+1);
270 ? git_path_submodule(submodule
, "%s", ref
)
271 : git_path("%s", ref
);
272 if (stat(refdir
, &st
) < 0)
274 if (S_ISDIR(st
.st_mode
)) {
275 get_ref_dir(submodule
, ref
, array
);
281 if (resolve_gitlink_ref(submodule
, ref
, sha1
) < 0) {
286 if (!resolve_ref(ref
, sha1
, 1, &flag
)) {
290 add_ref(ref
, sha1
, flag
, array
, NULL
);
297 struct warn_if_dangling_data
{
303 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
304 int flags
, void *cb_data
)
306 struct warn_if_dangling_data
*d
= cb_data
;
307 const char *resolves_to
;
308 unsigned char junk
[20];
310 if (!(flags
& REF_ISSYMREF
))
313 resolves_to
= resolve_ref(refname
, junk
, 0, NULL
);
314 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
317 fprintf(d
->fp
, d
->msg_fmt
, refname
);
321 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
323 struct warn_if_dangling_data data
;
326 data
.refname
= refname
;
327 data
.msg_fmt
= msg_fmt
;
328 for_each_rawref(warn_if_dangling_symref
, &data
);
331 static struct ref_array
*get_loose_refs(const char *submodule
)
334 free_ref_array(&submodule_refs
.loose
);
335 get_ref_dir(submodule
, "refs", &submodule_refs
.loose
);
336 sort_ref_array(&submodule_refs
.loose
);
337 return &submodule_refs
.loose
;
340 if (!cached_refs
.did_loose
) {
341 get_ref_dir(NULL
, "refs", &cached_refs
.loose
);
342 sort_ref_array(&cached_refs
.loose
);
343 cached_refs
.did_loose
= 1;
345 return &cached_refs
.loose
;
348 /* We allow "recursive" symbolic refs. Only within reason, though */
350 #define MAXREFLEN (1024)
352 static int resolve_gitlink_packed_ref(char *name
, int pathlen
, const char *refname
, unsigned char *result
)
355 struct cached_refs refs
;
356 struct ref_entry
*ref
;
359 strcpy(name
+ pathlen
, "packed-refs");
360 f
= fopen(name
, "r");
363 memset(&refs
, 0, sizeof(refs
));
364 read_packed_refs(f
, &refs
);
366 ref
= search_ref_array(&refs
.packed
, refname
);
368 memcpy(result
, ref
->sha1
, 20);
371 free_ref_array(&refs
.packed
);
375 static int resolve_gitlink_ref_recursive(char *name
, int pathlen
, const char *refname
, unsigned char *result
, int recursion
)
377 int fd
, len
= strlen(refname
);
378 char buffer
[128], *p
;
380 if (recursion
> MAXDEPTH
|| len
> MAXREFLEN
)
382 memcpy(name
+ pathlen
, refname
, len
+1);
383 fd
= open(name
, O_RDONLY
);
385 return resolve_gitlink_packed_ref(name
, pathlen
, refname
, result
);
387 len
= read(fd
, buffer
, sizeof(buffer
)-1);
391 while (len
&& isspace(buffer
[len
-1]))
395 /* Was it a detached head or an old-fashioned symlink? */
396 if (!get_sha1_hex(buffer
, result
))
400 if (strncmp(buffer
, "ref:", 4))
406 return resolve_gitlink_ref_recursive(name
, pathlen
, p
, result
, recursion
+1);
409 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *result
)
411 int len
= strlen(path
), retval
;
415 while (len
&& path
[len
-1] == '/')
419 gitdir
= xmalloc(len
+ MAXREFLEN
+ 8);
420 memcpy(gitdir
, path
, len
);
421 memcpy(gitdir
+ len
, "/.git", 6);
424 tmp
= read_gitfile_gently(gitdir
);
428 gitdir
= xmalloc(len
+ MAXREFLEN
+ 3);
429 memcpy(gitdir
, tmp
, len
);
432 gitdir
[++len
] = '\0';
433 retval
= resolve_gitlink_ref_recursive(gitdir
, len
, refname
, result
, 0);
439 * If the "reading" argument is set, this function finds out what _object_
440 * the ref points at by "reading" the ref. The ref, if it is not symbolic,
441 * has to exist, and if it is symbolic, it has to point at an existing ref,
442 * because the "read" goes through the symref to the ref it points at.
444 * The access that is not "reading" may often be "writing", but does not
445 * have to; it can be merely checking _where it leads to_. If it is a
446 * prelude to "writing" to the ref, a write to a symref that points at
447 * yet-to-be-born ref will create the real ref pointed by the symref.
448 * reading=0 allows the caller to check where such a symref leads to.
450 const char *resolve_ref(const char *ref
, unsigned char *sha1
, int reading
, int *flag
)
452 int depth
= MAXDEPTH
;
455 static char ref_buffer
[256];
469 git_snpath(path
, sizeof(path
), "%s", ref
);
470 /* Special case: non-existing file. */
471 if (lstat(path
, &st
) < 0) {
472 struct ref_array
*packed
= get_packed_refs(NULL
);
473 struct ref_entry
*r
= search_ref_array(packed
, ref
);
475 hashcpy(sha1
, r
->sha1
);
477 *flag
|= REF_ISPACKED
;
480 if (reading
|| errno
!= ENOENT
)
486 /* Follow "normalized" - ie "refs/.." symlinks by hand */
487 if (S_ISLNK(st
.st_mode
)) {
488 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
489 if (len
>= 5 && !memcmp("refs/", buffer
, 5)) {
491 strcpy(ref_buffer
, buffer
);
494 *flag
|= REF_ISSYMREF
;
499 /* Is it a directory? */
500 if (S_ISDIR(st
.st_mode
)) {
506 * Anything else, just open it and try to use it as
509 fd
= open(path
, O_RDONLY
);
512 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
516 * Is it a symbolic ref?
518 if (len
< 4 || memcmp("ref:", buffer
, 4))
522 while (len
&& isspace(*buf
))
524 while (len
&& isspace(buf
[len
-1]))
527 memcpy(ref_buffer
, buf
, len
+ 1);
530 *flag
|= REF_ISSYMREF
;
532 if (len
< 40 || get_sha1_hex(buffer
, sha1
))
537 /* The argument to filter_refs */
544 int read_ref(const char *ref
, unsigned char *sha1
)
546 if (resolve_ref(ref
, sha1
, 1, NULL
))
551 #define DO_FOR_EACH_INCLUDE_BROKEN 01
552 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
553 int flags
, void *cb_data
, struct ref_entry
*entry
)
555 if (strncmp(base
, entry
->name
, trim
))
558 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
559 if (entry
->flag
& REF_BROKEN
)
560 return 0; /* ignore dangling symref */
561 if (!has_sha1_file(entry
->sha1
)) {
562 error("%s does not point to a valid object!", entry
->name
);
567 return fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
570 static int filter_refs(const char *ref
, const unsigned char *sha
, int flags
,
573 struct ref_filter
*filter
= (struct ref_filter
*)data
;
574 if (fnmatch(filter
->pattern
, ref
, 0))
576 return filter
->fn(ref
, sha
, flags
, filter
->cb_data
);
579 int peel_ref(const char *ref
, unsigned char *sha1
)
582 unsigned char base
[20];
585 if (current_ref
&& (current_ref
->name
== ref
586 || !strcmp(current_ref
->name
, ref
))) {
587 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
588 hashcpy(sha1
, current_ref
->peeled
);
591 hashcpy(base
, current_ref
->sha1
);
595 if (!resolve_ref(ref
, base
, 1, &flag
))
598 if ((flag
& REF_ISPACKED
)) {
599 struct ref_array
*array
= get_packed_refs(NULL
);
600 struct ref_entry
*r
= search_ref_array(array
, ref
);
602 if (r
!= NULL
&& r
->flag
& REF_KNOWS_PEELED
) {
603 hashcpy(sha1
, r
->peeled
);
609 o
= parse_object(base
);
610 if (o
&& o
->type
== OBJ_TAG
) {
611 o
= deref_tag(o
, ref
, 0);
613 hashcpy(sha1
, o
->sha1
);
620 static int do_for_each_ref(const char *submodule
, const char *base
, each_ref_fn fn
,
621 int trim
, int flags
, void *cb_data
)
623 int retval
= 0, i
, p
= 0, l
= 0;
624 struct ref_array
*packed
= get_packed_refs(submodule
);
625 struct ref_array
*loose
= get_loose_refs(submodule
);
627 struct ref_array
*extra
= &extra_refs
;
629 for (i
= 0; i
< extra
->nr
; i
++)
630 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, extra
->refs
[i
]);
632 while (p
< packed
->nr
&& l
< loose
->nr
) {
633 struct ref_entry
*entry
;
634 int cmp
= strcmp(packed
->refs
[p
]->name
, loose
->refs
[l
]->name
);
640 entry
= loose
->refs
[l
++];
642 entry
= packed
->refs
[p
++];
644 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, entry
);
654 for (; p
< packed
->nr
; p
++) {
655 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, packed
->refs
[p
]);
666 static int do_head_ref(const char *submodule
, each_ref_fn fn
, void *cb_data
)
668 unsigned char sha1
[20];
672 if (resolve_gitlink_ref(submodule
, "HEAD", sha1
) == 0)
673 return fn("HEAD", sha1
, 0, cb_data
);
678 if (resolve_ref("HEAD", sha1
, 1, &flag
))
679 return fn("HEAD", sha1
, flag
, cb_data
);
684 int head_ref(each_ref_fn fn
, void *cb_data
)
686 return do_head_ref(NULL
, fn
, cb_data
);
689 int head_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
691 return do_head_ref(submodule
, fn
, cb_data
);
694 int for_each_ref(each_ref_fn fn
, void *cb_data
)
696 return do_for_each_ref(NULL
, "refs/", fn
, 0, 0, cb_data
);
699 int for_each_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
701 return do_for_each_ref(submodule
, "refs/", fn
, 0, 0, cb_data
);
704 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
706 return do_for_each_ref(NULL
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
709 int for_each_ref_in_submodule(const char *submodule
, const char *prefix
,
710 each_ref_fn fn
, void *cb_data
)
712 return do_for_each_ref(submodule
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
715 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
717 return for_each_ref_in("refs/tags/", fn
, cb_data
);
720 int for_each_tag_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
722 return for_each_ref_in_submodule(submodule
, "refs/tags/", fn
, cb_data
);
725 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
727 return for_each_ref_in("refs/heads/", fn
, cb_data
);
730 int for_each_branch_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
732 return for_each_ref_in_submodule(submodule
, "refs/heads/", fn
, cb_data
);
735 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
737 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
740 int for_each_remote_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
742 return for_each_ref_in_submodule(submodule
, "refs/remotes/", fn
, cb_data
);
745 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
747 return do_for_each_ref(NULL
, "refs/replace/", fn
, 13, 0, cb_data
);
750 int for_each_glob_ref_in(each_ref_fn fn
, const char *pattern
,
751 const char *prefix
, void *cb_data
)
753 struct strbuf real_pattern
= STRBUF_INIT
;
754 struct ref_filter filter
;
757 if (!prefix
&& prefixcmp(pattern
, "refs/"))
758 strbuf_addstr(&real_pattern
, "refs/");
760 strbuf_addstr(&real_pattern
, prefix
);
761 strbuf_addstr(&real_pattern
, pattern
);
763 if (!has_glob_specials(pattern
)) {
764 /* Append implied '/' '*' if not present. */
765 if (real_pattern
.buf
[real_pattern
.len
- 1] != '/')
766 strbuf_addch(&real_pattern
, '/');
767 /* No need to check for '*', there is none. */
768 strbuf_addch(&real_pattern
, '*');
771 filter
.pattern
= real_pattern
.buf
;
773 filter
.cb_data
= cb_data
;
774 ret
= for_each_ref(filter_refs
, &filter
);
776 strbuf_release(&real_pattern
);
780 int for_each_glob_ref(each_ref_fn fn
, const char *pattern
, void *cb_data
)
782 return for_each_glob_ref_in(fn
, pattern
, NULL
, cb_data
);
785 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
787 return do_for_each_ref(NULL
, "refs/", fn
, 0,
788 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
792 * Make sure "ref" is something reasonable to have under ".git/refs/";
793 * We do not like it if:
795 * - any path component of it begins with ".", or
796 * - it has double dots "..", or
797 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
798 * - it ends with a "/".
799 * - it ends with ".lock"
800 * - it contains a "\" (backslash)
803 static inline int bad_ref_char(int ch
)
805 if (((unsigned) ch
) <= ' ' ||
806 ch
== '~' || ch
== '^' || ch
== ':' || ch
== '\\')
808 /* 2.13 Pattern Matching Notation */
809 if (ch
== '?' || ch
== '[') /* Unsupported */
811 if (ch
== '*') /* Supported at the end */
816 int check_ref_format(const char *ref
)
818 int ch
, level
, bad_type
, last
;
819 int ret
= CHECK_REF_FORMAT_OK
;
820 const char *cp
= ref
;
824 while ((ch
= *cp
++) == '/')
825 ; /* tolerate duplicated slashes */
827 /* should not end with slashes */
828 return CHECK_REF_FORMAT_ERROR
;
830 /* we are at the beginning of the path component */
832 return CHECK_REF_FORMAT_ERROR
;
833 bad_type
= bad_ref_char(ch
);
835 if (bad_type
== 2 && (!*cp
|| *cp
== '/') &&
836 ret
== CHECK_REF_FORMAT_OK
)
837 ret
= CHECK_REF_FORMAT_WILDCARD
;
839 return CHECK_REF_FORMAT_ERROR
;
843 /* scan the rest of the path component */
844 while ((ch
= *cp
++) != 0) {
845 bad_type
= bad_ref_char(ch
);
847 return CHECK_REF_FORMAT_ERROR
;
850 if (last
== '.' && ch
== '.')
851 return CHECK_REF_FORMAT_ERROR
;
852 if (last
== '@' && ch
== '{')
853 return CHECK_REF_FORMAT_ERROR
;
858 if (ref
<= cp
- 2 && cp
[-2] == '.')
859 return CHECK_REF_FORMAT_ERROR
;
861 return CHECK_REF_FORMAT_ONELEVEL
;
862 if (has_extension(ref
, ".lock"))
863 return CHECK_REF_FORMAT_ERROR
;
869 const char *prettify_refname(const char *name
)
872 !prefixcmp(name
, "refs/heads/") ? 11 :
873 !prefixcmp(name
, "refs/tags/") ? 10 :
874 !prefixcmp(name
, "refs/remotes/") ? 13 :
878 const char *ref_rev_parse_rules
[] = {
884 "refs/remotes/%.*s/HEAD",
888 const char *ref_fetch_rules
[] = {
895 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
898 const int abbrev_name_len
= strlen(abbrev_name
);
900 for (p
= rules
; *p
; p
++) {
901 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
909 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
910 const unsigned char *old_sha1
, int mustexist
)
912 if (!resolve_ref(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
913 error("Can't verify ref %s", lock
->ref_name
);
917 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
918 error("Ref %s is at %s but expected %s", lock
->ref_name
,
919 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
926 static int remove_empty_directories(const char *file
)
928 /* we want to create a file but there is a directory there;
929 * if that is an empty directory (or a directory that contains
930 * only empty directories), remove them.
935 strbuf_init(&path
, 20);
936 strbuf_addstr(&path
, file
);
938 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
940 strbuf_release(&path
);
945 static int is_refname_available(const char *ref
, const char *oldref
,
946 struct ref_array
*array
, int quiet
)
948 int i
, namlen
= strlen(ref
); /* e.g. 'foo/bar' */
949 for (i
= 0; i
< array
->nr
; i
++ ) {
950 struct ref_entry
*entry
= array
->refs
[i
];
951 /* entry->name could be 'foo' or 'foo/bar/baz' */
952 if (!oldref
|| strcmp(oldref
, entry
->name
)) {
953 int len
= strlen(entry
->name
);
954 int cmplen
= (namlen
< len
) ? namlen
: len
;
955 const char *lead
= (namlen
< len
) ? entry
->name
: ref
;
956 if (!strncmp(ref
, entry
->name
, cmplen
) &&
957 lead
[cmplen
] == '/') {
959 error("'%s' exists; cannot create '%s'",
968 static struct ref_lock
*lock_ref_sha1_basic(const char *ref
, const unsigned char *old_sha1
, int flags
, int *type_p
)
971 const char *orig_ref
= ref
;
972 struct ref_lock
*lock
;
975 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
978 lock
= xcalloc(1, sizeof(struct ref_lock
));
981 ref
= resolve_ref(ref
, lock
->old_sha1
, mustexist
, &type
);
982 if (!ref
&& errno
== EISDIR
) {
983 /* we are trying to lock foo but we used to
984 * have foo/bar which now does not exist;
985 * it is normal for the empty directory 'foo'
988 ref_file
= git_path("%s", orig_ref
);
989 if (remove_empty_directories(ref_file
)) {
991 error("there are still refs under '%s'", orig_ref
);
994 ref
= resolve_ref(orig_ref
, lock
->old_sha1
, mustexist
, &type
);
1000 error("unable to resolve reference %s: %s",
1001 orig_ref
, strerror(errno
));
1004 missing
= is_null_sha1(lock
->old_sha1
);
1005 /* When the ref did not exist and we are creating it,
1006 * make sure there is no existing ref that is packed
1007 * whose name begins with our refname, nor a ref whose
1008 * name is a proper prefix of our refname.
1011 !is_refname_available(ref
, NULL
, get_packed_refs(NULL
), 0)) {
1012 last_errno
= ENOTDIR
;
1016 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1018 lflags
= LOCK_DIE_ON_ERROR
;
1019 if (flags
& REF_NODEREF
) {
1021 lflags
|= LOCK_NODEREF
;
1023 lock
->ref_name
= xstrdup(ref
);
1024 lock
->orig_ref_name
= xstrdup(orig_ref
);
1025 ref_file
= git_path("%s", ref
);
1027 lock
->force_write
= 1;
1028 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
1029 lock
->force_write
= 1;
1031 if (safe_create_leading_directories(ref_file
)) {
1033 error("unable to create directory for %s", ref_file
);
1037 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
1038 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
1046 struct ref_lock
*lock_ref_sha1(const char *ref
, const unsigned char *old_sha1
)
1048 char refpath
[PATH_MAX
];
1049 if (check_ref_format(ref
))
1051 strcpy(refpath
, mkpath("refs/%s", ref
));
1052 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
1055 struct ref_lock
*lock_any_ref_for_update(const char *ref
, const unsigned char *old_sha1
, int flags
)
1057 switch (check_ref_format(ref
)) {
1061 case CHECK_REF_FORMAT_ONELEVEL
:
1062 return lock_ref_sha1_basic(ref
, old_sha1
, flags
, NULL
);
1066 static struct lock_file packlock
;
1068 static int repack_without_ref(const char *refname
)
1070 struct ref_array
*packed
;
1071 struct ref_entry
*ref
;
1074 packed
= get_packed_refs(NULL
);
1075 ref
= search_ref_array(packed
, refname
);
1078 fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
1080 unable_to_lock_error(git_path("packed-refs"), errno
);
1081 return error("cannot delete '%s' from packed refs", refname
);
1084 for (i
= 0; i
< packed
->nr
; i
++) {
1085 char line
[PATH_MAX
+ 100];
1088 ref
= packed
->refs
[i
];
1090 if (!strcmp(refname
, ref
->name
))
1092 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1093 sha1_to_hex(ref
->sha1
), ref
->name
);
1094 /* this should not happen but just being defensive */
1095 if (len
> sizeof(line
))
1096 die("too long a refname '%s'", ref
->name
);
1097 write_or_die(fd
, line
, len
);
1099 return commit_lock_file(&packlock
);
1102 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1104 struct ref_lock
*lock
;
1105 int err
, i
= 0, ret
= 0, flag
= 0;
1107 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1110 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1114 if (!(delopt
& REF_NODEREF
)) {
1115 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1116 lock
->lk
->filename
[i
] = 0;
1117 path
= lock
->lk
->filename
;
1119 path
= git_path("%s", refname
);
1121 err
= unlink_or_warn(path
);
1122 if (err
&& errno
!= ENOENT
)
1125 if (!(delopt
& REF_NODEREF
))
1126 lock
->lk
->filename
[i
] = '.';
1128 /* removing the loose one could have resurrected an earlier
1129 * packed one. Also, if it was not loose we need to repack
1132 ret
|= repack_without_ref(refname
);
1134 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1135 invalidate_cached_refs();
1141 * People using contrib's git-new-workdir have .git/logs/refs ->
1142 * /some/other/path/.git/logs/refs, and that may live on another device.
1144 * IOW, to avoid cross device rename errors, the temporary renamed log must
1145 * live into logs/refs.
1147 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1149 int rename_ref(const char *oldref
, const char *newref
, const char *logmsg
)
1151 static const char renamed_ref
[] = "RENAMED-REF";
1152 unsigned char sha1
[20], orig_sha1
[20];
1153 int flag
= 0, logmoved
= 0;
1154 struct ref_lock
*lock
;
1155 struct stat loginfo
;
1156 int log
= !lstat(git_path("logs/%s", oldref
), &loginfo
);
1157 const char *symref
= NULL
;
1159 if (log
&& S_ISLNK(loginfo
.st_mode
))
1160 return error("reflog for %s is a symlink", oldref
);
1162 symref
= resolve_ref(oldref
, orig_sha1
, 1, &flag
);
1163 if (flag
& REF_ISSYMREF
)
1164 return error("refname %s is a symbolic ref, renaming it is not supported",
1167 return error("refname %s not found", oldref
);
1169 if (!is_refname_available(newref
, oldref
, get_packed_refs(NULL
), 0))
1172 if (!is_refname_available(newref
, oldref
, get_loose_refs(NULL
), 0))
1175 lock
= lock_ref_sha1_basic(renamed_ref
, NULL
, 0, NULL
);
1177 return error("unable to lock %s", renamed_ref
);
1178 lock
->force_write
= 1;
1179 if (write_ref_sha1(lock
, orig_sha1
, logmsg
))
1180 return error("unable to save current sha1 in %s", renamed_ref
);
1182 if (log
&& rename(git_path("logs/%s", oldref
), git_path(TMP_RENAMED_LOG
)))
1183 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG
": %s",
1184 oldref
, strerror(errno
));
1186 if (delete_ref(oldref
, orig_sha1
, REF_NODEREF
)) {
1187 error("unable to delete old %s", oldref
);
1191 if (resolve_ref(newref
, sha1
, 1, &flag
) && delete_ref(newref
, sha1
, REF_NODEREF
)) {
1192 if (errno
==EISDIR
) {
1193 if (remove_empty_directories(git_path("%s", newref
))) {
1194 error("Directory not empty: %s", newref
);
1198 error("unable to delete existing %s", newref
);
1203 if (log
&& safe_create_leading_directories(git_path("logs/%s", newref
))) {
1204 error("unable to create directory for %s", newref
);
1209 if (log
&& rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", newref
))) {
1210 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1212 * rename(a, b) when b is an existing
1213 * directory ought to result in ISDIR, but
1214 * Solaris 5.8 gives ENOTDIR. Sheesh.
1216 if (remove_empty_directories(git_path("logs/%s", newref
))) {
1217 error("Directory not empty: logs/%s", newref
);
1222 error("unable to move logfile "TMP_RENAMED_LOG
" to logs/%s: %s",
1223 newref
, strerror(errno
));
1229 lock
= lock_ref_sha1_basic(newref
, NULL
, 0, NULL
);
1231 error("unable to lock %s for update", newref
);
1234 lock
->force_write
= 1;
1235 hashcpy(lock
->old_sha1
, orig_sha1
);
1236 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1237 error("unable to write current sha1 into %s", newref
);
1244 lock
= lock_ref_sha1_basic(oldref
, NULL
, 0, NULL
);
1246 error("unable to lock %s for rollback", oldref
);
1250 lock
->force_write
= 1;
1251 flag
= log_all_ref_updates
;
1252 log_all_ref_updates
= 0;
1253 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1254 error("unable to write current sha1 into %s", oldref
);
1255 log_all_ref_updates
= flag
;
1258 if (logmoved
&& rename(git_path("logs/%s", newref
), git_path("logs/%s", oldref
)))
1259 error("unable to restore logfile %s from %s: %s",
1260 oldref
, newref
, strerror(errno
));
1261 if (!logmoved
&& log
&&
1262 rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", oldref
)))
1263 error("unable to restore logfile %s from "TMP_RENAMED_LOG
": %s",
1264 oldref
, strerror(errno
));
1269 int close_ref(struct ref_lock
*lock
)
1271 if (close_lock_file(lock
->lk
))
1277 int commit_ref(struct ref_lock
*lock
)
1279 if (commit_lock_file(lock
->lk
))
1285 void unlock_ref(struct ref_lock
*lock
)
1287 /* Do not free lock->lk -- atexit() still looks at them */
1289 rollback_lock_file(lock
->lk
);
1290 free(lock
->ref_name
);
1291 free(lock
->orig_ref_name
);
1296 * copy the reflog message msg to buf, which has been allocated sufficiently
1297 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1298 * because reflog file is one line per entry.
1300 static int copy_msg(char *buf
, const char *msg
)
1307 while ((c
= *msg
++)) {
1308 if (wasspace
&& isspace(c
))
1310 wasspace
= isspace(c
);
1315 while (buf
< cp
&& isspace(cp
[-1]))
1321 int log_ref_setup(const char *ref_name
, char *logfile
, int bufsize
)
1323 int logfd
, oflags
= O_APPEND
| O_WRONLY
;
1325 git_snpath(logfile
, bufsize
, "logs/%s", ref_name
);
1326 if (log_all_ref_updates
&&
1327 (!prefixcmp(ref_name
, "refs/heads/") ||
1328 !prefixcmp(ref_name
, "refs/remotes/") ||
1329 !prefixcmp(ref_name
, "refs/notes/") ||
1330 !strcmp(ref_name
, "HEAD"))) {
1331 if (safe_create_leading_directories(logfile
) < 0)
1332 return error("unable to create directory for %s",
1337 logfd
= open(logfile
, oflags
, 0666);
1339 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1342 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1343 if (remove_empty_directories(logfile
)) {
1344 return error("There are still logs under '%s'",
1347 logfd
= open(logfile
, oflags
, 0666);
1351 return error("Unable to append to %s: %s",
1352 logfile
, strerror(errno
));
1355 adjust_shared_perm(logfile
);
1360 static int log_ref_write(const char *ref_name
, const unsigned char *old_sha1
,
1361 const unsigned char *new_sha1
, const char *msg
)
1363 int logfd
, result
, written
, oflags
= O_APPEND
| O_WRONLY
;
1364 unsigned maxlen
, len
;
1366 char log_file
[PATH_MAX
];
1368 const char *committer
;
1370 if (log_all_ref_updates
< 0)
1371 log_all_ref_updates
= !is_bare_repository();
1373 result
= log_ref_setup(ref_name
, log_file
, sizeof(log_file
));
1377 logfd
= open(log_file
, oflags
);
1380 msglen
= msg
? strlen(msg
) : 0;
1381 committer
= git_committer_info(0);
1382 maxlen
= strlen(committer
) + msglen
+ 100;
1383 logrec
= xmalloc(maxlen
);
1384 len
= sprintf(logrec
, "%s %s %s\n",
1385 sha1_to_hex(old_sha1
),
1386 sha1_to_hex(new_sha1
),
1389 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1390 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1392 if (close(logfd
) != 0 || written
!= len
)
1393 return error("Unable to append to %s", log_file
);
1397 static int is_branch(const char *refname
)
1399 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1402 int write_ref_sha1(struct ref_lock
*lock
,
1403 const unsigned char *sha1
, const char *logmsg
)
1405 static char term
= '\n';
1410 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1414 o
= parse_object(sha1
);
1416 error("Trying to write ref %s with nonexistant object %s",
1417 lock
->ref_name
, sha1_to_hex(sha1
));
1421 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1422 error("Trying to write non-commit object %s to branch %s",
1423 sha1_to_hex(sha1
), lock
->ref_name
);
1427 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1428 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1429 || close_ref(lock
) < 0) {
1430 error("Couldn't write %s", lock
->lk
->filename
);
1434 invalidate_cached_refs();
1435 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1436 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1437 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1441 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1443 * Special hack: If a branch is updated directly and HEAD
1444 * points to it (may happen on the remote side of a push
1445 * for example) then logically the HEAD reflog should be
1447 * A generic solution implies reverse symref information,
1448 * but finding all symrefs pointing to the given branch
1449 * would be rather costly for this rare event (the direct
1450 * update of a branch) to be worth it. So let's cheat and
1451 * check with HEAD only which should cover 99% of all usage
1452 * scenarios (even 100% of the default ones).
1454 unsigned char head_sha1
[20];
1456 const char *head_ref
;
1457 head_ref
= resolve_ref("HEAD", head_sha1
, 1, &head_flag
);
1458 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1459 !strcmp(head_ref
, lock
->ref_name
))
1460 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1462 if (commit_ref(lock
)) {
1463 error("Couldn't set %s", lock
->ref_name
);
1471 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1474 const char *lockpath
;
1476 int fd
, len
, written
;
1477 char *git_HEAD
= git_pathdup("%s", ref_target
);
1478 unsigned char old_sha1
[20], new_sha1
[20];
1480 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1483 if (safe_create_leading_directories(git_HEAD
) < 0)
1484 return error("unable to create directory for %s", git_HEAD
);
1486 #ifndef NO_SYMLINK_HEAD
1487 if (prefer_symlink_refs
) {
1489 if (!symlink(refs_heads_master
, git_HEAD
))
1491 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1495 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1496 if (sizeof(ref
) <= len
) {
1497 error("refname too long: %s", refs_heads_master
);
1498 goto error_free_return
;
1500 lockpath
= mkpath("%s.lock", git_HEAD
);
1501 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1503 error("Unable to open %s for writing", lockpath
);
1504 goto error_free_return
;
1506 written
= write_in_full(fd
, ref
, len
);
1507 if (close(fd
) != 0 || written
!= len
) {
1508 error("Unable to write to %s", lockpath
);
1509 goto error_unlink_return
;
1511 if (rename(lockpath
, git_HEAD
) < 0) {
1512 error("Unable to create %s", git_HEAD
);
1513 goto error_unlink_return
;
1515 if (adjust_shared_perm(git_HEAD
)) {
1516 error("Unable to fix permissions on %s", lockpath
);
1517 error_unlink_return
:
1518 unlink_or_warn(lockpath
);
1524 #ifndef NO_SYMLINK_HEAD
1527 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1528 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1534 static char *ref_msg(const char *line
, const char *endp
)
1538 ep
= memchr(line
, '\n', endp
- line
);
1541 return xmemdupz(line
, ep
- line
);
1544 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
)
1546 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1548 int logfd
, tz
, reccnt
= 0;
1551 unsigned char logged_sha1
[20];
1555 logfile
= git_path("logs/%s", ref
);
1556 logfd
= open(logfile
, O_RDONLY
, 0);
1558 die_errno("Unable to read log '%s'", logfile
);
1561 die("Log %s is empty.", logfile
);
1562 mapsz
= xsize_t(st
.st_size
);
1563 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1564 logdata
= log_mapped
;
1568 rec
= logend
= logdata
+ st
.st_size
;
1569 while (logdata
< rec
) {
1571 if (logdata
< rec
&& *(rec
-1) == '\n')
1574 while (logdata
< rec
&& *(rec
-1) != '\n') {
1580 die("Log %s is corrupt.", logfile
);
1581 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1582 if (date
<= at_time
|| cnt
== 0) {
1583 tz
= strtoul(tz_c
, NULL
, 10);
1585 *msg
= ref_msg(rec
, logend
);
1587 *cutoff_time
= date
;
1591 *cutoff_cnt
= reccnt
- 1;
1593 if (get_sha1_hex(lastrec
, logged_sha1
))
1594 die("Log %s is corrupt.", logfile
);
1595 if (get_sha1_hex(rec
+ 41, sha1
))
1596 die("Log %s is corrupt.", logfile
);
1597 if (hashcmp(logged_sha1
, sha1
)) {
1598 warning("Log %s has gap after %s.",
1599 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1602 else if (date
== at_time
) {
1603 if (get_sha1_hex(rec
+ 41, sha1
))
1604 die("Log %s is corrupt.", logfile
);
1607 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1608 die("Log %s is corrupt.", logfile
);
1609 if (hashcmp(logged_sha1
, sha1
)) {
1610 warning("Log %s unexpectedly ended on %s.",
1611 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1614 munmap(log_mapped
, mapsz
);
1623 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1625 if (rec
== logend
|| *rec
== '\n')
1626 die("Log %s is corrupt.", logfile
);
1627 date
= strtoul(rec
+ 1, &tz_c
, 10);
1628 tz
= strtoul(tz_c
, NULL
, 10);
1629 if (get_sha1_hex(logdata
, sha1
))
1630 die("Log %s is corrupt.", logfile
);
1631 if (is_null_sha1(sha1
)) {
1632 if (get_sha1_hex(logdata
+ 41, sha1
))
1633 die("Log %s is corrupt.", logfile
);
1636 *msg
= ref_msg(logdata
, logend
);
1637 munmap(log_mapped
, mapsz
);
1640 *cutoff_time
= date
;
1644 *cutoff_cnt
= reccnt
;
1648 int for_each_recent_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1650 const char *logfile
;
1652 struct strbuf sb
= STRBUF_INIT
;
1655 logfile
= git_path("logs/%s", ref
);
1656 logfp
= fopen(logfile
, "r");
1661 struct stat statbuf
;
1662 if (fstat(fileno(logfp
), &statbuf
) ||
1663 statbuf
.st_size
< ofs
||
1664 fseek(logfp
, -ofs
, SEEK_END
) ||
1665 strbuf_getwholeline(&sb
, logfp
, '\n')) {
1667 strbuf_release(&sb
);
1672 while (!strbuf_getwholeline(&sb
, logfp
, '\n')) {
1673 unsigned char osha1
[20], nsha1
[20];
1674 char *email_end
, *message
;
1675 unsigned long timestamp
;
1678 /* old SP new SP name <email> SP time TAB msg LF */
1679 if (sb
.len
< 83 || sb
.buf
[sb
.len
- 1] != '\n' ||
1680 get_sha1_hex(sb
.buf
, osha1
) || sb
.buf
[40] != ' ' ||
1681 get_sha1_hex(sb
.buf
+ 41, nsha1
) || sb
.buf
[81] != ' ' ||
1682 !(email_end
= strchr(sb
.buf
+ 82, '>')) ||
1683 email_end
[1] != ' ' ||
1684 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1685 !message
|| message
[0] != ' ' ||
1686 (message
[1] != '+' && message
[1] != '-') ||
1687 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1688 !isdigit(message
[4]) || !isdigit(message
[5]))
1689 continue; /* corrupt? */
1690 email_end
[1] = '\0';
1691 tz
= strtol(message
+ 1, NULL
, 10);
1692 if (message
[6] != '\t')
1696 ret
= fn(osha1
, nsha1
, sb
.buf
+ 82, timestamp
, tz
, message
,
1702 strbuf_release(&sb
);
1706 int for_each_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, void *cb_data
)
1708 return for_each_recent_reflog_ent(ref
, fn
, 0, cb_data
);
1711 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
1713 DIR *dir
= opendir(git_path("logs/%s", base
));
1718 int baselen
= strlen(base
);
1719 char *log
= xmalloc(baselen
+ 257);
1721 memcpy(log
, base
, baselen
);
1722 if (baselen
&& base
[baselen
-1] != '/')
1723 log
[baselen
++] = '/';
1725 while ((de
= readdir(dir
)) != NULL
) {
1729 if (de
->d_name
[0] == '.')
1731 namelen
= strlen(de
->d_name
);
1734 if (has_extension(de
->d_name
, ".lock"))
1736 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
1737 if (stat(git_path("logs/%s", log
), &st
) < 0)
1739 if (S_ISDIR(st
.st_mode
)) {
1740 retval
= do_for_each_reflog(log
, fn
, cb_data
);
1742 unsigned char sha1
[20];
1743 if (!resolve_ref(log
, sha1
, 0, NULL
))
1744 retval
= error("bad ref for %s", log
);
1746 retval
= fn(log
, sha1
, 0, cb_data
);
1759 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
1761 return do_for_each_reflog("", fn
, cb_data
);
1764 int update_ref(const char *action
, const char *refname
,
1765 const unsigned char *sha1
, const unsigned char *oldval
,
1766 int flags
, enum action_on_err onerr
)
1768 static struct ref_lock
*lock
;
1769 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
1771 const char *str
= "Cannot lock the ref '%s'.";
1773 case MSG_ON_ERR
: error(str
, refname
); break;
1774 case DIE_ON_ERR
: die(str
, refname
); break;
1775 case QUIET_ON_ERR
: break;
1779 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
1780 const char *str
= "Cannot update the ref '%s'.";
1782 case MSG_ON_ERR
: error(str
, refname
); break;
1783 case DIE_ON_ERR
: die(str
, refname
); break;
1784 case QUIET_ON_ERR
: break;
1791 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
1793 for ( ; list
; list
= list
->next
)
1794 if (!strcmp(list
->name
, name
))
1795 return (struct ref
*)list
;
1800 * generate a format suitable for scanf from a ref_rev_parse_rules
1801 * rule, that is replace the "%.*s" spec with a "%s" spec
1803 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
1807 spec
= strstr(rule
, "%.*s");
1808 if (!spec
|| strstr(spec
+ 4, "%.*s"))
1809 die("invalid rule in ref_rev_parse_rules: %s", rule
);
1811 /* copy all until spec */
1812 strncpy(scanf_fmt
, rule
, spec
- rule
);
1813 scanf_fmt
[spec
- rule
] = '\0';
1815 strcat(scanf_fmt
, "%s");
1816 /* copy remaining rule */
1817 strcat(scanf_fmt
, spec
+ 4);
1822 char *shorten_unambiguous_ref(const char *ref
, int strict
)
1825 static char **scanf_fmts
;
1826 static int nr_rules
;
1829 /* pre generate scanf formats from ref_rev_parse_rules[] */
1831 size_t total_len
= 0;
1833 /* the rule list is NULL terminated, count them first */
1834 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
1835 /* no +1 because strlen("%s") < strlen("%.*s") */
1836 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
1838 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
1841 for (i
= 0; i
< nr_rules
; i
++) {
1842 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
1844 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
1845 total_len
+= strlen(ref_rev_parse_rules
[i
]);
1849 /* bail out if there are no rules */
1851 return xstrdup(ref
);
1853 /* buffer for scanf result, at most ref must fit */
1854 short_name
= xstrdup(ref
);
1856 /* skip first rule, it will always match */
1857 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
1859 int rules_to_fail
= i
;
1862 if (1 != sscanf(ref
, scanf_fmts
[i
], short_name
))
1865 short_name_len
= strlen(short_name
);
1868 * in strict mode, all (except the matched one) rules
1869 * must fail to resolve to a valid non-ambiguous ref
1872 rules_to_fail
= nr_rules
;
1875 * check if the short name resolves to a valid ref,
1876 * but use only rules prior to the matched one
1878 for (j
= 0; j
< rules_to_fail
; j
++) {
1879 const char *rule
= ref_rev_parse_rules
[j
];
1880 unsigned char short_objectname
[20];
1881 char refname
[PATH_MAX
];
1883 /* skip matched rule */
1888 * the short name is ambiguous, if it resolves
1889 * (with this previous rule) to a valid ref
1890 * read_ref() returns 0 on success
1892 mksnpath(refname
, sizeof(refname
),
1893 rule
, short_name_len
, short_name
);
1894 if (!read_ref(refname
, short_objectname
))
1899 * short name is non-ambiguous if all previous rules
1900 * haven't resolved to a valid ref
1902 if (j
== rules_to_fail
)
1907 return xstrdup(ref
);