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
);
101 array
->refs
[i
] = array
->refs
[j
];
106 static struct ref_entry
*search_ref_array(struct ref_array
*array
, const char *name
)
108 struct ref_entry
*e
, **r
;
117 len
= strlen(name
) + 1;
118 e
= xmalloc(sizeof(struct ref_entry
) + len
);
119 memcpy(e
->name
, name
, len
);
121 r
= bsearch(&e
, array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
132 * Future: need to be in "struct repository"
133 * when doing a full libification.
135 static struct cached_refs
{
138 struct ref_array loose
;
139 struct ref_array packed
;
140 } cached_refs
, submodule_refs
;
141 static struct ref_entry
*current_ref
;
143 static struct ref_array extra_refs
;
145 static void free_ref_array(struct ref_array
*array
)
148 for (i
= 0; i
< array
->nr
; i
++)
149 free(array
->refs
[i
]);
151 array
->nr
= array
->alloc
= 0;
155 static void invalidate_cached_refs(void)
157 struct cached_refs
*ca
= &cached_refs
;
160 free_ref_array(&ca
->loose
);
162 free_ref_array(&ca
->packed
);
163 ca
->did_loose
= ca
->did_packed
= 0;
166 static void read_packed_refs(FILE *f
, struct cached_refs
*cached_refs
)
168 struct ref_entry
*last
= NULL
;
169 char refline
[PATH_MAX
];
170 int flag
= REF_ISPACKED
;
172 while (fgets(refline
, sizeof(refline
), f
)) {
173 unsigned char sha1
[20];
175 static const char header
[] = "# pack-refs with:";
177 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
178 const char *traits
= refline
+ sizeof(header
) - 1;
179 if (strstr(traits
, " peeled "))
180 flag
|= REF_KNOWS_PEELED
;
181 /* perhaps other traits later as well */
185 name
= parse_ref_line(refline
, sha1
);
187 add_ref(name
, sha1
, flag
, &cached_refs
->packed
, &last
);
192 strlen(refline
) == 42 &&
193 refline
[41] == '\n' &&
194 !get_sha1_hex(refline
+ 1, sha1
))
195 hashcpy(last
->peeled
, sha1
);
197 sort_ref_array(&cached_refs
->packed
);
200 void add_extra_ref(const char *name
, const unsigned char *sha1
, int flag
)
202 add_ref(name
, sha1
, flag
, &extra_refs
, NULL
);
205 void clear_extra_refs(void)
207 free_ref_array(&extra_refs
);
210 static struct ref_array
*get_packed_refs(const char *submodule
)
212 const char *packed_refs_file
;
213 struct cached_refs
*refs
;
216 packed_refs_file
= git_path_submodule(submodule
, "packed-refs");
217 refs
= &submodule_refs
;
218 free_ref_array(&refs
->packed
);
220 packed_refs_file
= git_path("packed-refs");
224 if (!refs
->did_packed
|| submodule
) {
225 FILE *f
= fopen(packed_refs_file
, "r");
227 read_packed_refs(f
, refs
);
230 refs
->did_packed
= 1;
232 return &refs
->packed
;
235 static void get_ref_dir(const char *submodule
, const char *base
,
236 struct ref_array
*array
)
242 path
= git_path_submodule(submodule
, "%s", base
);
244 path
= git_path("%s", base
);
251 int baselen
= strlen(base
);
252 char *ref
= xmalloc(baselen
+ 257);
254 memcpy(ref
, base
, baselen
);
255 if (baselen
&& base
[baselen
-1] != '/')
256 ref
[baselen
++] = '/';
258 while ((de
= readdir(dir
)) != NULL
) {
259 unsigned char sha1
[20];
265 if (de
->d_name
[0] == '.')
267 namelen
= strlen(de
->d_name
);
270 if (has_extension(de
->d_name
, ".lock"))
272 memcpy(ref
+ baselen
, de
->d_name
, namelen
+1);
274 ? git_path_submodule(submodule
, "%s", ref
)
275 : git_path("%s", ref
);
276 if (stat(refdir
, &st
) < 0)
278 if (S_ISDIR(st
.st_mode
)) {
279 get_ref_dir(submodule
, ref
, array
);
285 if (resolve_gitlink_ref(submodule
, ref
, sha1
) < 0) {
290 if (!resolve_ref(ref
, sha1
, 1, &flag
)) {
294 add_ref(ref
, sha1
, flag
, array
, NULL
);
301 struct warn_if_dangling_data
{
307 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
308 int flags
, void *cb_data
)
310 struct warn_if_dangling_data
*d
= cb_data
;
311 const char *resolves_to
;
312 unsigned char junk
[20];
314 if (!(flags
& REF_ISSYMREF
))
317 resolves_to
= resolve_ref(refname
, junk
, 0, NULL
);
318 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
321 fprintf(d
->fp
, d
->msg_fmt
, refname
);
325 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
327 struct warn_if_dangling_data data
;
330 data
.refname
= refname
;
331 data
.msg_fmt
= msg_fmt
;
332 for_each_rawref(warn_if_dangling_symref
, &data
);
335 static struct ref_array
*get_loose_refs(const char *submodule
)
338 free_ref_array(&submodule_refs
.loose
);
339 get_ref_dir(submodule
, "refs", &submodule_refs
.loose
);
340 sort_ref_array(&submodule_refs
.loose
);
341 return &submodule_refs
.loose
;
344 if (!cached_refs
.did_loose
) {
345 get_ref_dir(NULL
, "refs", &cached_refs
.loose
);
346 sort_ref_array(&cached_refs
.loose
);
347 cached_refs
.did_loose
= 1;
349 return &cached_refs
.loose
;
352 /* We allow "recursive" symbolic refs. Only within reason, though */
354 #define MAXREFLEN (1024)
356 static int resolve_gitlink_packed_ref(char *name
, int pathlen
, const char *refname
, unsigned char *result
)
359 struct cached_refs refs
;
360 struct ref_entry
*ref
;
363 strcpy(name
+ pathlen
, "packed-refs");
364 f
= fopen(name
, "r");
367 memset(&refs
, 0, sizeof(refs
));
368 read_packed_refs(f
, &refs
);
370 ref
= search_ref_array(&refs
.packed
, refname
);
372 memcpy(result
, ref
->sha1
, 20);
375 free_ref_array(&refs
.packed
);
379 static int resolve_gitlink_ref_recursive(char *name
, int pathlen
, const char *refname
, unsigned char *result
, int recursion
)
381 int fd
, len
= strlen(refname
);
382 char buffer
[128], *p
;
384 if (recursion
> MAXDEPTH
|| len
> MAXREFLEN
)
386 memcpy(name
+ pathlen
, refname
, len
+1);
387 fd
= open(name
, O_RDONLY
);
389 return resolve_gitlink_packed_ref(name
, pathlen
, refname
, result
);
391 len
= read(fd
, buffer
, sizeof(buffer
)-1);
395 while (len
&& isspace(buffer
[len
-1]))
399 /* Was it a detached head or an old-fashioned symlink? */
400 if (!get_sha1_hex(buffer
, result
))
404 if (strncmp(buffer
, "ref:", 4))
410 return resolve_gitlink_ref_recursive(name
, pathlen
, p
, result
, recursion
+1);
413 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *result
)
415 int len
= strlen(path
), retval
;
419 while (len
&& path
[len
-1] == '/')
423 gitdir
= xmalloc(len
+ MAXREFLEN
+ 8);
424 memcpy(gitdir
, path
, len
);
425 memcpy(gitdir
+ len
, "/.git", 6);
428 tmp
= read_gitfile_gently(gitdir
);
432 gitdir
= xmalloc(len
+ MAXREFLEN
+ 3);
433 memcpy(gitdir
, tmp
, len
);
436 gitdir
[++len
] = '\0';
437 retval
= resolve_gitlink_ref_recursive(gitdir
, len
, refname
, result
, 0);
443 * If the "reading" argument is set, this function finds out what _object_
444 * the ref points at by "reading" the ref. The ref, if it is not symbolic,
445 * has to exist, and if it is symbolic, it has to point at an existing ref,
446 * because the "read" goes through the symref to the ref it points at.
448 * The access that is not "reading" may often be "writing", but does not
449 * have to; it can be merely checking _where it leads to_. If it is a
450 * prelude to "writing" to the ref, a write to a symref that points at
451 * yet-to-be-born ref will create the real ref pointed by the symref.
452 * reading=0 allows the caller to check where such a symref leads to.
454 const char *resolve_ref(const char *ref
, unsigned char *sha1
, int reading
, int *flag
)
456 int depth
= MAXDEPTH
;
459 static char ref_buffer
[256];
473 git_snpath(path
, sizeof(path
), "%s", ref
);
474 /* Special case: non-existing file. */
475 if (lstat(path
, &st
) < 0) {
476 struct ref_array
*packed
= get_packed_refs(NULL
);
477 struct ref_entry
*r
= search_ref_array(packed
, ref
);
479 hashcpy(sha1
, r
->sha1
);
481 *flag
|= REF_ISPACKED
;
484 if (reading
|| errno
!= ENOENT
)
490 /* Follow "normalized" - ie "refs/.." symlinks by hand */
491 if (S_ISLNK(st
.st_mode
)) {
492 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
493 if (len
>= 5 && !memcmp("refs/", buffer
, 5)) {
495 strcpy(ref_buffer
, buffer
);
498 *flag
|= REF_ISSYMREF
;
503 /* Is it a directory? */
504 if (S_ISDIR(st
.st_mode
)) {
510 * Anything else, just open it and try to use it as
513 fd
= open(path
, O_RDONLY
);
516 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
520 * Is it a symbolic ref?
522 if (len
< 4 || memcmp("ref:", buffer
, 4))
526 while (len
&& isspace(*buf
))
528 while (len
&& isspace(buf
[len
-1]))
531 memcpy(ref_buffer
, buf
, len
+ 1);
534 *flag
|= REF_ISSYMREF
;
536 if (len
< 40 || get_sha1_hex(buffer
, sha1
))
541 /* The argument to filter_refs */
548 int read_ref(const char *ref
, unsigned char *sha1
)
550 if (resolve_ref(ref
, sha1
, 1, NULL
))
555 #define DO_FOR_EACH_INCLUDE_BROKEN 01
556 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
557 int flags
, void *cb_data
, struct ref_entry
*entry
)
559 if (strncmp(base
, entry
->name
, trim
))
562 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
563 if (entry
->flag
& REF_BROKEN
)
564 return 0; /* ignore dangling symref */
565 if (!has_sha1_file(entry
->sha1
)) {
566 error("%s does not point to a valid object!", entry
->name
);
571 return fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
574 static int filter_refs(const char *ref
, const unsigned char *sha
, int flags
,
577 struct ref_filter
*filter
= (struct ref_filter
*)data
;
578 if (fnmatch(filter
->pattern
, ref
, 0))
580 return filter
->fn(ref
, sha
, flags
, filter
->cb_data
);
583 int peel_ref(const char *ref
, unsigned char *sha1
)
586 unsigned char base
[20];
589 if (current_ref
&& (current_ref
->name
== ref
590 || !strcmp(current_ref
->name
, ref
))) {
591 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
592 hashcpy(sha1
, current_ref
->peeled
);
595 hashcpy(base
, current_ref
->sha1
);
599 if (!resolve_ref(ref
, base
, 1, &flag
))
602 if ((flag
& REF_ISPACKED
)) {
603 struct ref_array
*array
= get_packed_refs(NULL
);
604 struct ref_entry
*r
= search_ref_array(array
, ref
);
606 if (r
!= NULL
&& r
->flag
& REF_KNOWS_PEELED
) {
607 hashcpy(sha1
, r
->peeled
);
613 o
= parse_object(base
);
614 if (o
&& o
->type
== OBJ_TAG
) {
615 o
= deref_tag(o
, ref
, 0);
617 hashcpy(sha1
, o
->sha1
);
624 static int do_for_each_ref(const char *submodule
, const char *base
, each_ref_fn fn
,
625 int trim
, int flags
, void *cb_data
)
627 int retval
= 0, i
, p
= 0, l
= 0;
628 struct ref_array
*packed
= get_packed_refs(submodule
);
629 struct ref_array
*loose
= get_loose_refs(submodule
);
631 struct ref_array
*extra
= &extra_refs
;
633 for (i
= 0; i
< extra
->nr
; i
++)
634 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, extra
->refs
[i
]);
636 while (p
< packed
->nr
&& l
< loose
->nr
) {
637 struct ref_entry
*entry
;
638 int cmp
= strcmp(packed
->refs
[p
]->name
, loose
->refs
[l
]->name
);
644 entry
= loose
->refs
[l
++];
646 entry
= packed
->refs
[p
++];
648 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, entry
);
658 for (; p
< packed
->nr
; p
++) {
659 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, packed
->refs
[p
]);
670 static int do_head_ref(const char *submodule
, each_ref_fn fn
, void *cb_data
)
672 unsigned char sha1
[20];
676 if (resolve_gitlink_ref(submodule
, "HEAD", sha1
) == 0)
677 return fn("HEAD", sha1
, 0, cb_data
);
682 if (resolve_ref("HEAD", sha1
, 1, &flag
))
683 return fn("HEAD", sha1
, flag
, cb_data
);
688 int head_ref(each_ref_fn fn
, void *cb_data
)
690 return do_head_ref(NULL
, fn
, cb_data
);
693 int head_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
695 return do_head_ref(submodule
, fn
, cb_data
);
698 int for_each_ref(each_ref_fn fn
, void *cb_data
)
700 return do_for_each_ref(NULL
, "refs/", fn
, 0, 0, cb_data
);
703 int for_each_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
705 return do_for_each_ref(submodule
, "refs/", fn
, 0, 0, cb_data
);
708 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
710 return do_for_each_ref(NULL
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
713 int for_each_ref_in_submodule(const char *submodule
, const char *prefix
,
714 each_ref_fn fn
, void *cb_data
)
716 return do_for_each_ref(submodule
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
719 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
721 return for_each_ref_in("refs/tags/", fn
, cb_data
);
724 int for_each_tag_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
726 return for_each_ref_in_submodule(submodule
, "refs/tags/", fn
, cb_data
);
729 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
731 return for_each_ref_in("refs/heads/", fn
, cb_data
);
734 int for_each_branch_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
736 return for_each_ref_in_submodule(submodule
, "refs/heads/", fn
, cb_data
);
739 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
741 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
744 int for_each_remote_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
746 return for_each_ref_in_submodule(submodule
, "refs/remotes/", fn
, cb_data
);
749 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
751 return do_for_each_ref(NULL
, "refs/replace/", fn
, 13, 0, cb_data
);
754 int for_each_glob_ref_in(each_ref_fn fn
, const char *pattern
,
755 const char *prefix
, void *cb_data
)
757 struct strbuf real_pattern
= STRBUF_INIT
;
758 struct ref_filter filter
;
761 if (!prefix
&& prefixcmp(pattern
, "refs/"))
762 strbuf_addstr(&real_pattern
, "refs/");
764 strbuf_addstr(&real_pattern
, prefix
);
765 strbuf_addstr(&real_pattern
, pattern
);
767 if (!has_glob_specials(pattern
)) {
768 /* Append implied '/' '*' if not present. */
769 if (real_pattern
.buf
[real_pattern
.len
- 1] != '/')
770 strbuf_addch(&real_pattern
, '/');
771 /* No need to check for '*', there is none. */
772 strbuf_addch(&real_pattern
, '*');
775 filter
.pattern
= real_pattern
.buf
;
777 filter
.cb_data
= cb_data
;
778 ret
= for_each_ref(filter_refs
, &filter
);
780 strbuf_release(&real_pattern
);
784 int for_each_glob_ref(each_ref_fn fn
, const char *pattern
, void *cb_data
)
786 return for_each_glob_ref_in(fn
, pattern
, NULL
, cb_data
);
789 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
791 return do_for_each_ref(NULL
, "refs/", fn
, 0,
792 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
796 * Make sure "ref" is something reasonable to have under ".git/refs/";
797 * We do not like it if:
799 * - any path component of it begins with ".", or
800 * - it has double dots "..", or
801 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
802 * - it ends with a "/".
803 * - it ends with ".lock"
804 * - it contains a "\" (backslash)
807 static inline int bad_ref_char(int ch
)
809 if (((unsigned) ch
) <= ' ' ||
810 ch
== '~' || ch
== '^' || ch
== ':' || ch
== '\\')
812 /* 2.13 Pattern Matching Notation */
813 if (ch
== '?' || ch
== '[') /* Unsupported */
815 if (ch
== '*') /* Supported at the end */
820 int check_ref_format(const char *ref
)
822 int ch
, level
, bad_type
, last
;
823 int ret
= CHECK_REF_FORMAT_OK
;
824 const char *cp
= ref
;
828 while ((ch
= *cp
++) == '/')
829 ; /* tolerate duplicated slashes */
831 /* should not end with slashes */
832 return CHECK_REF_FORMAT_ERROR
;
834 /* we are at the beginning of the path component */
836 return CHECK_REF_FORMAT_ERROR
;
837 bad_type
= bad_ref_char(ch
);
839 if (bad_type
== 2 && (!*cp
|| *cp
== '/') &&
840 ret
== CHECK_REF_FORMAT_OK
)
841 ret
= CHECK_REF_FORMAT_WILDCARD
;
843 return CHECK_REF_FORMAT_ERROR
;
847 /* scan the rest of the path component */
848 while ((ch
= *cp
++) != 0) {
849 bad_type
= bad_ref_char(ch
);
851 return CHECK_REF_FORMAT_ERROR
;
854 if (last
== '.' && ch
== '.')
855 return CHECK_REF_FORMAT_ERROR
;
856 if (last
== '@' && ch
== '{')
857 return CHECK_REF_FORMAT_ERROR
;
862 if (ref
<= cp
- 2 && cp
[-2] == '.')
863 return CHECK_REF_FORMAT_ERROR
;
865 return CHECK_REF_FORMAT_ONELEVEL
;
866 if (has_extension(ref
, ".lock"))
867 return CHECK_REF_FORMAT_ERROR
;
873 const char *prettify_refname(const char *name
)
876 !prefixcmp(name
, "refs/heads/") ? 11 :
877 !prefixcmp(name
, "refs/tags/") ? 10 :
878 !prefixcmp(name
, "refs/remotes/") ? 13 :
882 const char *ref_rev_parse_rules
[] = {
888 "refs/remotes/%.*s/HEAD",
892 const char *ref_fetch_rules
[] = {
899 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
902 const int abbrev_name_len
= strlen(abbrev_name
);
904 for (p
= rules
; *p
; p
++) {
905 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
913 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
914 const unsigned char *old_sha1
, int mustexist
)
916 if (!resolve_ref(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
917 error("Can't verify ref %s", lock
->ref_name
);
921 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
922 error("Ref %s is at %s but expected %s", lock
->ref_name
,
923 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
930 static int remove_empty_directories(const char *file
)
932 /* we want to create a file but there is a directory there;
933 * if that is an empty directory (or a directory that contains
934 * only empty directories), remove them.
939 strbuf_init(&path
, 20);
940 strbuf_addstr(&path
, file
);
942 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
944 strbuf_release(&path
);
949 static int is_refname_available(const char *ref
, const char *oldref
,
950 struct ref_array
*array
, int quiet
)
952 int i
, namlen
= strlen(ref
); /* e.g. 'foo/bar' */
953 for (i
= 0; i
< array
->nr
; i
++ ) {
954 struct ref_entry
*entry
= array
->refs
[i
];
955 /* entry->name could be 'foo' or 'foo/bar/baz' */
956 if (!oldref
|| strcmp(oldref
, entry
->name
)) {
957 int len
= strlen(entry
->name
);
958 int cmplen
= (namlen
< len
) ? namlen
: len
;
959 const char *lead
= (namlen
< len
) ? entry
->name
: ref
;
960 if (!strncmp(ref
, entry
->name
, cmplen
) &&
961 lead
[cmplen
] == '/') {
963 error("'%s' exists; cannot create '%s'",
972 static struct ref_lock
*lock_ref_sha1_basic(const char *ref
, const unsigned char *old_sha1
, int flags
, int *type_p
)
975 const char *orig_ref
= ref
;
976 struct ref_lock
*lock
;
979 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
982 lock
= xcalloc(1, sizeof(struct ref_lock
));
985 ref
= resolve_ref(ref
, lock
->old_sha1
, mustexist
, &type
);
986 if (!ref
&& errno
== EISDIR
) {
987 /* we are trying to lock foo but we used to
988 * have foo/bar which now does not exist;
989 * it is normal for the empty directory 'foo'
992 ref_file
= git_path("%s", orig_ref
);
993 if (remove_empty_directories(ref_file
)) {
995 error("there are still refs under '%s'", orig_ref
);
998 ref
= resolve_ref(orig_ref
, lock
->old_sha1
, mustexist
, &type
);
1004 error("unable to resolve reference %s: %s",
1005 orig_ref
, strerror(errno
));
1008 missing
= is_null_sha1(lock
->old_sha1
);
1009 /* When the ref did not exist and we are creating it,
1010 * make sure there is no existing ref that is packed
1011 * whose name begins with our refname, nor a ref whose
1012 * name is a proper prefix of our refname.
1015 !is_refname_available(ref
, NULL
, get_packed_refs(NULL
), 0)) {
1016 last_errno
= ENOTDIR
;
1020 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1022 lflags
= LOCK_DIE_ON_ERROR
;
1023 if (flags
& REF_NODEREF
) {
1025 lflags
|= LOCK_NODEREF
;
1027 lock
->ref_name
= xstrdup(ref
);
1028 lock
->orig_ref_name
= xstrdup(orig_ref
);
1029 ref_file
= git_path("%s", ref
);
1031 lock
->force_write
= 1;
1032 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
1033 lock
->force_write
= 1;
1035 if (safe_create_leading_directories(ref_file
)) {
1037 error("unable to create directory for %s", ref_file
);
1041 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
1042 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
1050 struct ref_lock
*lock_ref_sha1(const char *ref
, const unsigned char *old_sha1
)
1052 char refpath
[PATH_MAX
];
1053 if (check_ref_format(ref
))
1055 strcpy(refpath
, mkpath("refs/%s", ref
));
1056 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
1059 struct ref_lock
*lock_any_ref_for_update(const char *ref
, const unsigned char *old_sha1
, int flags
)
1061 switch (check_ref_format(ref
)) {
1065 case CHECK_REF_FORMAT_ONELEVEL
:
1066 return lock_ref_sha1_basic(ref
, old_sha1
, flags
, NULL
);
1070 static struct lock_file packlock
;
1072 static int repack_without_ref(const char *refname
)
1074 struct ref_array
*packed
;
1075 struct ref_entry
*ref
;
1078 packed
= get_packed_refs(NULL
);
1079 ref
= search_ref_array(packed
, refname
);
1082 fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
1084 unable_to_lock_error(git_path("packed-refs"), errno
);
1085 return error("cannot delete '%s' from packed refs", refname
);
1088 for (i
= 0; i
< packed
->nr
; i
++) {
1089 char line
[PATH_MAX
+ 100];
1092 ref
= packed
->refs
[i
];
1094 if (!strcmp(refname
, ref
->name
))
1096 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1097 sha1_to_hex(ref
->sha1
), ref
->name
);
1098 /* this should not happen but just being defensive */
1099 if (len
> sizeof(line
))
1100 die("too long a refname '%s'", ref
->name
);
1101 write_or_die(fd
, line
, len
);
1103 return commit_lock_file(&packlock
);
1106 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1108 struct ref_lock
*lock
;
1109 int err
, i
= 0, ret
= 0, flag
= 0;
1111 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1114 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1118 if (!(delopt
& REF_NODEREF
)) {
1119 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1120 lock
->lk
->filename
[i
] = 0;
1121 path
= lock
->lk
->filename
;
1123 path
= git_path("%s", refname
);
1125 err
= unlink_or_warn(path
);
1126 if (err
&& errno
!= ENOENT
)
1129 if (!(delopt
& REF_NODEREF
))
1130 lock
->lk
->filename
[i
] = '.';
1132 /* removing the loose one could have resurrected an earlier
1133 * packed one. Also, if it was not loose we need to repack
1136 ret
|= repack_without_ref(refname
);
1138 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1139 invalidate_cached_refs();
1145 * People using contrib's git-new-workdir have .git/logs/refs ->
1146 * /some/other/path/.git/logs/refs, and that may live on another device.
1148 * IOW, to avoid cross device rename errors, the temporary renamed log must
1149 * live into logs/refs.
1151 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1153 int rename_ref(const char *oldref
, const char *newref
, const char *logmsg
)
1155 static const char renamed_ref
[] = "RENAMED-REF";
1156 unsigned char sha1
[20], orig_sha1
[20];
1157 int flag
= 0, logmoved
= 0;
1158 struct ref_lock
*lock
;
1159 struct stat loginfo
;
1160 int log
= !lstat(git_path("logs/%s", oldref
), &loginfo
);
1161 const char *symref
= NULL
;
1163 if (log
&& S_ISLNK(loginfo
.st_mode
))
1164 return error("reflog for %s is a symlink", oldref
);
1166 symref
= resolve_ref(oldref
, orig_sha1
, 1, &flag
);
1167 if (flag
& REF_ISSYMREF
)
1168 return error("refname %s is a symbolic ref, renaming it is not supported",
1171 return error("refname %s not found", oldref
);
1173 if (!is_refname_available(newref
, oldref
, get_packed_refs(NULL
), 0))
1176 if (!is_refname_available(newref
, oldref
, get_loose_refs(NULL
), 0))
1179 lock
= lock_ref_sha1_basic(renamed_ref
, NULL
, 0, NULL
);
1181 return error("unable to lock %s", renamed_ref
);
1182 lock
->force_write
= 1;
1183 if (write_ref_sha1(lock
, orig_sha1
, logmsg
))
1184 return error("unable to save current sha1 in %s", renamed_ref
);
1186 if (log
&& rename(git_path("logs/%s", oldref
), git_path(TMP_RENAMED_LOG
)))
1187 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG
": %s",
1188 oldref
, strerror(errno
));
1190 if (delete_ref(oldref
, orig_sha1
, REF_NODEREF
)) {
1191 error("unable to delete old %s", oldref
);
1195 if (resolve_ref(newref
, sha1
, 1, &flag
) && delete_ref(newref
, sha1
, REF_NODEREF
)) {
1196 if (errno
==EISDIR
) {
1197 if (remove_empty_directories(git_path("%s", newref
))) {
1198 error("Directory not empty: %s", newref
);
1202 error("unable to delete existing %s", newref
);
1207 if (log
&& safe_create_leading_directories(git_path("logs/%s", newref
))) {
1208 error("unable to create directory for %s", newref
);
1213 if (log
&& rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", newref
))) {
1214 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1216 * rename(a, b) when b is an existing
1217 * directory ought to result in ISDIR, but
1218 * Solaris 5.8 gives ENOTDIR. Sheesh.
1220 if (remove_empty_directories(git_path("logs/%s", newref
))) {
1221 error("Directory not empty: logs/%s", newref
);
1226 error("unable to move logfile "TMP_RENAMED_LOG
" to logs/%s: %s",
1227 newref
, strerror(errno
));
1233 lock
= lock_ref_sha1_basic(newref
, NULL
, 0, NULL
);
1235 error("unable to lock %s for update", newref
);
1238 lock
->force_write
= 1;
1239 hashcpy(lock
->old_sha1
, orig_sha1
);
1240 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1241 error("unable to write current sha1 into %s", newref
);
1248 lock
= lock_ref_sha1_basic(oldref
, NULL
, 0, NULL
);
1250 error("unable to lock %s for rollback", oldref
);
1254 lock
->force_write
= 1;
1255 flag
= log_all_ref_updates
;
1256 log_all_ref_updates
= 0;
1257 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1258 error("unable to write current sha1 into %s", oldref
);
1259 log_all_ref_updates
= flag
;
1262 if (logmoved
&& rename(git_path("logs/%s", newref
), git_path("logs/%s", oldref
)))
1263 error("unable to restore logfile %s from %s: %s",
1264 oldref
, newref
, strerror(errno
));
1265 if (!logmoved
&& log
&&
1266 rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", oldref
)))
1267 error("unable to restore logfile %s from "TMP_RENAMED_LOG
": %s",
1268 oldref
, strerror(errno
));
1273 int close_ref(struct ref_lock
*lock
)
1275 if (close_lock_file(lock
->lk
))
1281 int commit_ref(struct ref_lock
*lock
)
1283 if (commit_lock_file(lock
->lk
))
1289 void unlock_ref(struct ref_lock
*lock
)
1291 /* Do not free lock->lk -- atexit() still looks at them */
1293 rollback_lock_file(lock
->lk
);
1294 free(lock
->ref_name
);
1295 free(lock
->orig_ref_name
);
1300 * copy the reflog message msg to buf, which has been allocated sufficiently
1301 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1302 * because reflog file is one line per entry.
1304 static int copy_msg(char *buf
, const char *msg
)
1311 while ((c
= *msg
++)) {
1312 if (wasspace
&& isspace(c
))
1314 wasspace
= isspace(c
);
1319 while (buf
< cp
&& isspace(cp
[-1]))
1325 int log_ref_setup(const char *ref_name
, char *logfile
, int bufsize
)
1327 int logfd
, oflags
= O_APPEND
| O_WRONLY
;
1329 git_snpath(logfile
, bufsize
, "logs/%s", ref_name
);
1330 if (log_all_ref_updates
&&
1331 (!prefixcmp(ref_name
, "refs/heads/") ||
1332 !prefixcmp(ref_name
, "refs/remotes/") ||
1333 !prefixcmp(ref_name
, "refs/notes/") ||
1334 !strcmp(ref_name
, "HEAD"))) {
1335 if (safe_create_leading_directories(logfile
) < 0)
1336 return error("unable to create directory for %s",
1341 logfd
= open(logfile
, oflags
, 0666);
1343 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1346 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1347 if (remove_empty_directories(logfile
)) {
1348 return error("There are still logs under '%s'",
1351 logfd
= open(logfile
, oflags
, 0666);
1355 return error("Unable to append to %s: %s",
1356 logfile
, strerror(errno
));
1359 adjust_shared_perm(logfile
);
1364 static int log_ref_write(const char *ref_name
, const unsigned char *old_sha1
,
1365 const unsigned char *new_sha1
, const char *msg
)
1367 int logfd
, result
, written
, oflags
= O_APPEND
| O_WRONLY
;
1368 unsigned maxlen
, len
;
1370 char log_file
[PATH_MAX
];
1372 const char *committer
;
1374 if (log_all_ref_updates
< 0)
1375 log_all_ref_updates
= !is_bare_repository();
1377 result
= log_ref_setup(ref_name
, log_file
, sizeof(log_file
));
1381 logfd
= open(log_file
, oflags
);
1384 msglen
= msg
? strlen(msg
) : 0;
1385 committer
= git_committer_info(0);
1386 maxlen
= strlen(committer
) + msglen
+ 100;
1387 logrec
= xmalloc(maxlen
);
1388 len
= sprintf(logrec
, "%s %s %s\n",
1389 sha1_to_hex(old_sha1
),
1390 sha1_to_hex(new_sha1
),
1393 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1394 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1396 if (close(logfd
) != 0 || written
!= len
)
1397 return error("Unable to append to %s", log_file
);
1401 static int is_branch(const char *refname
)
1403 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1406 int write_ref_sha1(struct ref_lock
*lock
,
1407 const unsigned char *sha1
, const char *logmsg
)
1409 static char term
= '\n';
1414 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1418 o
= parse_object(sha1
);
1420 error("Trying to write ref %s with nonexistant object %s",
1421 lock
->ref_name
, sha1_to_hex(sha1
));
1425 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1426 error("Trying to write non-commit object %s to branch %s",
1427 sha1_to_hex(sha1
), lock
->ref_name
);
1431 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1432 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1433 || close_ref(lock
) < 0) {
1434 error("Couldn't write %s", lock
->lk
->filename
);
1438 invalidate_cached_refs();
1439 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1440 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1441 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1445 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1447 * Special hack: If a branch is updated directly and HEAD
1448 * points to it (may happen on the remote side of a push
1449 * for example) then logically the HEAD reflog should be
1451 * A generic solution implies reverse symref information,
1452 * but finding all symrefs pointing to the given branch
1453 * would be rather costly for this rare event (the direct
1454 * update of a branch) to be worth it. So let's cheat and
1455 * check with HEAD only which should cover 99% of all usage
1456 * scenarios (even 100% of the default ones).
1458 unsigned char head_sha1
[20];
1460 const char *head_ref
;
1461 head_ref
= resolve_ref("HEAD", head_sha1
, 1, &head_flag
);
1462 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1463 !strcmp(head_ref
, lock
->ref_name
))
1464 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1466 if (commit_ref(lock
)) {
1467 error("Couldn't set %s", lock
->ref_name
);
1475 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1478 const char *lockpath
;
1480 int fd
, len
, written
;
1481 char *git_HEAD
= git_pathdup("%s", ref_target
);
1482 unsigned char old_sha1
[20], new_sha1
[20];
1484 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1487 if (safe_create_leading_directories(git_HEAD
) < 0)
1488 return error("unable to create directory for %s", git_HEAD
);
1490 #ifndef NO_SYMLINK_HEAD
1491 if (prefer_symlink_refs
) {
1493 if (!symlink(refs_heads_master
, git_HEAD
))
1495 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1499 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1500 if (sizeof(ref
) <= len
) {
1501 error("refname too long: %s", refs_heads_master
);
1502 goto error_free_return
;
1504 lockpath
= mkpath("%s.lock", git_HEAD
);
1505 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1507 error("Unable to open %s for writing", lockpath
);
1508 goto error_free_return
;
1510 written
= write_in_full(fd
, ref
, len
);
1511 if (close(fd
) != 0 || written
!= len
) {
1512 error("Unable to write to %s", lockpath
);
1513 goto error_unlink_return
;
1515 if (rename(lockpath
, git_HEAD
) < 0) {
1516 error("Unable to create %s", git_HEAD
);
1517 goto error_unlink_return
;
1519 if (adjust_shared_perm(git_HEAD
)) {
1520 error("Unable to fix permissions on %s", lockpath
);
1521 error_unlink_return
:
1522 unlink_or_warn(lockpath
);
1528 #ifndef NO_SYMLINK_HEAD
1531 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1532 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1538 static char *ref_msg(const char *line
, const char *endp
)
1542 ep
= memchr(line
, '\n', endp
- line
);
1545 return xmemdupz(line
, ep
- line
);
1548 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
)
1550 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1552 int logfd
, tz
, reccnt
= 0;
1555 unsigned char logged_sha1
[20];
1559 logfile
= git_path("logs/%s", ref
);
1560 logfd
= open(logfile
, O_RDONLY
, 0);
1562 die_errno("Unable to read log '%s'", logfile
);
1565 die("Log %s is empty.", logfile
);
1566 mapsz
= xsize_t(st
.st_size
);
1567 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1568 logdata
= log_mapped
;
1572 rec
= logend
= logdata
+ st
.st_size
;
1573 while (logdata
< rec
) {
1575 if (logdata
< rec
&& *(rec
-1) == '\n')
1578 while (logdata
< rec
&& *(rec
-1) != '\n') {
1584 die("Log %s is corrupt.", logfile
);
1585 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1586 if (date
<= at_time
|| cnt
== 0) {
1587 tz
= strtoul(tz_c
, NULL
, 10);
1589 *msg
= ref_msg(rec
, logend
);
1591 *cutoff_time
= date
;
1595 *cutoff_cnt
= reccnt
- 1;
1597 if (get_sha1_hex(lastrec
, logged_sha1
))
1598 die("Log %s is corrupt.", logfile
);
1599 if (get_sha1_hex(rec
+ 41, sha1
))
1600 die("Log %s is corrupt.", logfile
);
1601 if (hashcmp(logged_sha1
, sha1
)) {
1602 warning("Log %s has gap after %s.",
1603 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1606 else if (date
== at_time
) {
1607 if (get_sha1_hex(rec
+ 41, sha1
))
1608 die("Log %s is corrupt.", logfile
);
1611 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1612 die("Log %s is corrupt.", logfile
);
1613 if (hashcmp(logged_sha1
, sha1
)) {
1614 warning("Log %s unexpectedly ended on %s.",
1615 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1618 munmap(log_mapped
, mapsz
);
1627 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1629 if (rec
== logend
|| *rec
== '\n')
1630 die("Log %s is corrupt.", logfile
);
1631 date
= strtoul(rec
+ 1, &tz_c
, 10);
1632 tz
= strtoul(tz_c
, NULL
, 10);
1633 if (get_sha1_hex(logdata
, sha1
))
1634 die("Log %s is corrupt.", logfile
);
1635 if (is_null_sha1(sha1
)) {
1636 if (get_sha1_hex(logdata
+ 41, sha1
))
1637 die("Log %s is corrupt.", logfile
);
1640 *msg
= ref_msg(logdata
, logend
);
1641 munmap(log_mapped
, mapsz
);
1644 *cutoff_time
= date
;
1648 *cutoff_cnt
= reccnt
;
1652 int for_each_recent_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1654 const char *logfile
;
1656 struct strbuf sb
= STRBUF_INIT
;
1659 logfile
= git_path("logs/%s", ref
);
1660 logfp
= fopen(logfile
, "r");
1665 struct stat statbuf
;
1666 if (fstat(fileno(logfp
), &statbuf
) ||
1667 statbuf
.st_size
< ofs
||
1668 fseek(logfp
, -ofs
, SEEK_END
) ||
1669 strbuf_getwholeline(&sb
, logfp
, '\n')) {
1671 strbuf_release(&sb
);
1676 while (!strbuf_getwholeline(&sb
, logfp
, '\n')) {
1677 unsigned char osha1
[20], nsha1
[20];
1678 char *email_end
, *message
;
1679 unsigned long timestamp
;
1682 /* old SP new SP name <email> SP time TAB msg LF */
1683 if (sb
.len
< 83 || sb
.buf
[sb
.len
- 1] != '\n' ||
1684 get_sha1_hex(sb
.buf
, osha1
) || sb
.buf
[40] != ' ' ||
1685 get_sha1_hex(sb
.buf
+ 41, nsha1
) || sb
.buf
[81] != ' ' ||
1686 !(email_end
= strchr(sb
.buf
+ 82, '>')) ||
1687 email_end
[1] != ' ' ||
1688 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1689 !message
|| message
[0] != ' ' ||
1690 (message
[1] != '+' && message
[1] != '-') ||
1691 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1692 !isdigit(message
[4]) || !isdigit(message
[5]))
1693 continue; /* corrupt? */
1694 email_end
[1] = '\0';
1695 tz
= strtol(message
+ 1, NULL
, 10);
1696 if (message
[6] != '\t')
1700 ret
= fn(osha1
, nsha1
, sb
.buf
+ 82, timestamp
, tz
, message
,
1706 strbuf_release(&sb
);
1710 int for_each_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, void *cb_data
)
1712 return for_each_recent_reflog_ent(ref
, fn
, 0, cb_data
);
1715 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
1717 DIR *dir
= opendir(git_path("logs/%s", base
));
1722 int baselen
= strlen(base
);
1723 char *log
= xmalloc(baselen
+ 257);
1725 memcpy(log
, base
, baselen
);
1726 if (baselen
&& base
[baselen
-1] != '/')
1727 log
[baselen
++] = '/';
1729 while ((de
= readdir(dir
)) != NULL
) {
1733 if (de
->d_name
[0] == '.')
1735 namelen
= strlen(de
->d_name
);
1738 if (has_extension(de
->d_name
, ".lock"))
1740 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
1741 if (stat(git_path("logs/%s", log
), &st
) < 0)
1743 if (S_ISDIR(st
.st_mode
)) {
1744 retval
= do_for_each_reflog(log
, fn
, cb_data
);
1746 unsigned char sha1
[20];
1747 if (!resolve_ref(log
, sha1
, 0, NULL
))
1748 retval
= error("bad ref for %s", log
);
1750 retval
= fn(log
, sha1
, 0, cb_data
);
1763 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
1765 return do_for_each_reflog("", fn
, cb_data
);
1768 int update_ref(const char *action
, const char *refname
,
1769 const unsigned char *sha1
, const unsigned char *oldval
,
1770 int flags
, enum action_on_err onerr
)
1772 static struct ref_lock
*lock
;
1773 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
1775 const char *str
= "Cannot lock the ref '%s'.";
1777 case MSG_ON_ERR
: error(str
, refname
); break;
1778 case DIE_ON_ERR
: die(str
, refname
); break;
1779 case QUIET_ON_ERR
: break;
1783 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
1784 const char *str
= "Cannot update the ref '%s'.";
1786 case MSG_ON_ERR
: error(str
, refname
); break;
1787 case DIE_ON_ERR
: die(str
, refname
); break;
1788 case QUIET_ON_ERR
: break;
1795 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
1797 for ( ; list
; list
= list
->next
)
1798 if (!strcmp(list
->name
, name
))
1799 return (struct ref
*)list
;
1804 * generate a format suitable for scanf from a ref_rev_parse_rules
1805 * rule, that is replace the "%.*s" spec with a "%s" spec
1807 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
1811 spec
= strstr(rule
, "%.*s");
1812 if (!spec
|| strstr(spec
+ 4, "%.*s"))
1813 die("invalid rule in ref_rev_parse_rules: %s", rule
);
1815 /* copy all until spec */
1816 strncpy(scanf_fmt
, rule
, spec
- rule
);
1817 scanf_fmt
[spec
- rule
] = '\0';
1819 strcat(scanf_fmt
, "%s");
1820 /* copy remaining rule */
1821 strcat(scanf_fmt
, spec
+ 4);
1826 char *shorten_unambiguous_ref(const char *ref
, int strict
)
1829 static char **scanf_fmts
;
1830 static int nr_rules
;
1833 /* pre generate scanf formats from ref_rev_parse_rules[] */
1835 size_t total_len
= 0;
1837 /* the rule list is NULL terminated, count them first */
1838 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
1839 /* no +1 because strlen("%s") < strlen("%.*s") */
1840 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
1842 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
1845 for (i
= 0; i
< nr_rules
; i
++) {
1846 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
1848 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
1849 total_len
+= strlen(ref_rev_parse_rules
[i
]);
1853 /* bail out if there are no rules */
1855 return xstrdup(ref
);
1857 /* buffer for scanf result, at most ref must fit */
1858 short_name
= xstrdup(ref
);
1860 /* skip first rule, it will always match */
1861 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
1863 int rules_to_fail
= i
;
1866 if (1 != sscanf(ref
, scanf_fmts
[i
], short_name
))
1869 short_name_len
= strlen(short_name
);
1872 * in strict mode, all (except the matched one) rules
1873 * must fail to resolve to a valid non-ambiguous ref
1876 rules_to_fail
= nr_rules
;
1879 * check if the short name resolves to a valid ref,
1880 * but use only rules prior to the matched one
1882 for (j
= 0; j
< rules_to_fail
; j
++) {
1883 const char *rule
= ref_rev_parse_rules
[j
];
1884 unsigned char short_objectname
[20];
1885 char refname
[PATH_MAX
];
1887 /* skip matched rule */
1892 * the short name is ambiguous, if it resolves
1893 * (with this previous rule) to a valid ref
1894 * read_ref() returns 0 on success
1896 mksnpath(refname
, sizeof(refname
),
1897 rule
, short_name_len
, short_name
);
1898 if (!read_ref(refname
, short_objectname
))
1903 * short name is non-ambiguous if all previous rules
1904 * haven't resolved to a valid ref
1906 if (j
== rules_to_fail
)
1911 return xstrdup(ref
);