7 /* ISSYMREF=01 and ISPACKED=02 are public interfaces */
8 #define REF_KNOWS_PEELED 04
12 struct ref_list
*next
;
13 unsigned char flag
; /* ISSYMREF? ISPACKED? */
14 unsigned char sha1
[20];
15 unsigned char peeled
[20];
16 char name
[FLEX_ARRAY
];
19 static const char *parse_ref_line(char *line
, unsigned char *sha1
)
22 * 42: the answer to everything.
24 * In this case, it happens to be the answer to
25 * 40 (length of sha1 hex representation)
26 * +1 (space in between hex and name)
27 * +1 (newline at the end of the line)
29 int len
= strlen(line
) - 42;
33 if (get_sha1_hex(line
, sha1
) < 0)
35 if (!isspace(line
[40]))
40 if (line
[len
] != '\n')
47 static struct ref_list
*add_ref(const char *name
, const unsigned char *sha1
,
48 int flag
, struct ref_list
*list
,
49 struct ref_list
**new_entry
)
52 struct ref_list
*entry
;
54 /* Allocate it and add it in.. */
55 len
= strlen(name
) + 1;
56 entry
= xmalloc(sizeof(struct ref_list
) + len
);
57 hashcpy(entry
->sha1
, sha1
);
58 hashclr(entry
->peeled
);
59 if (check_refname_format(name
, REFNAME_ALLOW_ONELEVEL
|REFNAME_DOT_COMPONENT
))
60 die("Reference has invalid format: '%s'", name
);
61 memcpy(entry
->name
, name
, len
);
69 /* merge sort the ref list */
70 static struct ref_list
*sort_ref_list(struct ref_list
*list
)
72 int psize
, qsize
, last_merge_count
, cmp
;
73 struct ref_list
*p
, *q
, *l
, *e
;
74 struct ref_list
*new_list
= list
;
82 last_merge_count
= merge_count
;
95 while (psize
< k
&& q
->next
) {
101 while ((psize
> 0) || (qsize
> 0 && q
)) {
102 if (qsize
== 0 || !q
) {
106 } else if (psize
== 0) {
111 cmp
= strcmp(q
->name
, p
->name
);
116 } else if (cmp
> 0) {
121 if (hashcmp(q
->sha1
, p
->sha1
))
122 die("Duplicated ref, and SHA1s don't match: %s",
124 warning("Duplicated ref: %s", q
->name
);
148 } while ((last_merge_count
!= merge_count
) || (last_merge_count
!= 1));
154 * Future: need to be in "struct repository"
155 * when doing a full libification.
157 static struct cached_refs
{
160 struct ref_list
*loose
;
161 struct ref_list
*packed
;
162 } cached_refs
, submodule_refs
;
163 static struct ref_list
*current_ref
;
165 static struct ref_list
*extra_refs
;
167 static void free_ref_list(struct ref_list
*list
)
169 struct ref_list
*next
;
170 for ( ; list
; list
= next
) {
176 static void invalidate_cached_refs(void)
178 struct cached_refs
*ca
= &cached_refs
;
180 if (ca
->did_loose
&& ca
->loose
)
181 free_ref_list(ca
->loose
);
182 if (ca
->did_packed
&& ca
->packed
)
183 free_ref_list(ca
->packed
);
184 ca
->loose
= ca
->packed
= NULL
;
185 ca
->did_loose
= ca
->did_packed
= 0;
188 static void read_packed_refs(FILE *f
, struct cached_refs
*cached_refs
)
190 struct ref_list
*list
= NULL
;
191 struct ref_list
*last
= NULL
;
192 char refline
[PATH_MAX
];
193 int flag
= REF_ISPACKED
;
195 while (fgets(refline
, sizeof(refline
), f
)) {
196 unsigned char sha1
[20];
198 static const char header
[] = "# pack-refs with:";
200 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
201 const char *traits
= refline
+ sizeof(header
) - 1;
202 if (strstr(traits
, " peeled "))
203 flag
|= REF_KNOWS_PEELED
;
204 /* perhaps other traits later as well */
208 name
= parse_ref_line(refline
, sha1
);
210 list
= add_ref(name
, sha1
, flag
, list
, &last
);
215 strlen(refline
) == 42 &&
216 refline
[41] == '\n' &&
217 !get_sha1_hex(refline
+ 1, sha1
))
218 hashcpy(last
->peeled
, sha1
);
220 cached_refs
->packed
= sort_ref_list(list
);
223 void add_extra_ref(const char *name
, const unsigned char *sha1
, int flag
)
225 extra_refs
= add_ref(name
, sha1
, flag
, extra_refs
, NULL
);
228 void clear_extra_refs(void)
230 free_ref_list(extra_refs
);
234 static struct ref_list
*get_packed_refs(const char *submodule
)
236 const char *packed_refs_file
;
237 struct cached_refs
*refs
;
240 packed_refs_file
= git_path_submodule(submodule
, "packed-refs");
241 refs
= &submodule_refs
;
242 free_ref_list(refs
->packed
);
244 packed_refs_file
= git_path("packed-refs");
248 if (!refs
->did_packed
|| submodule
) {
249 FILE *f
= fopen(packed_refs_file
, "r");
252 read_packed_refs(f
, refs
);
255 refs
->did_packed
= 1;
260 static struct ref_list
*get_ref_dir(const char *submodule
, const char *base
,
261 struct ref_list
*list
)
267 path
= git_path_submodule(submodule
, "%s", base
);
269 path
= git_path("%s", base
);
276 int baselen
= strlen(base
);
277 char *ref
= xmalloc(baselen
+ 257);
279 memcpy(ref
, base
, baselen
);
280 if (baselen
&& base
[baselen
-1] != '/')
281 ref
[baselen
++] = '/';
283 while ((de
= readdir(dir
)) != NULL
) {
284 unsigned char sha1
[20];
290 if (de
->d_name
[0] == '.')
292 namelen
= strlen(de
->d_name
);
295 if (has_extension(de
->d_name
, ".lock"))
297 memcpy(ref
+ baselen
, de
->d_name
, namelen
+1);
299 ? git_path_submodule(submodule
, "%s", ref
)
300 : git_path("%s", ref
);
301 if (stat(refdir
, &st
) < 0)
303 if (S_ISDIR(st
.st_mode
)) {
304 list
= get_ref_dir(submodule
, ref
, list
);
310 if (resolve_gitlink_ref(submodule
, ref
, sha1
) < 0) {
315 if (!resolve_ref(ref
, sha1
, 1, &flag
)) {
319 list
= add_ref(ref
, sha1
, flag
, list
, NULL
);
324 return sort_ref_list(list
);
327 struct warn_if_dangling_data
{
333 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
334 int flags
, void *cb_data
)
336 struct warn_if_dangling_data
*d
= cb_data
;
337 const char *resolves_to
;
338 unsigned char junk
[20];
340 if (!(flags
& REF_ISSYMREF
))
343 resolves_to
= resolve_ref(refname
, junk
, 0, NULL
);
344 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
347 fprintf(d
->fp
, d
->msg_fmt
, refname
);
351 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
353 struct warn_if_dangling_data data
;
356 data
.refname
= refname
;
357 data
.msg_fmt
= msg_fmt
;
358 for_each_rawref(warn_if_dangling_symref
, &data
);
361 static struct ref_list
*get_loose_refs(const char *submodule
)
364 free_ref_list(submodule_refs
.loose
);
365 submodule_refs
.loose
= get_ref_dir(submodule
, "refs", NULL
);
366 return submodule_refs
.loose
;
369 if (!cached_refs
.did_loose
) {
370 cached_refs
.loose
= get_ref_dir(NULL
, "refs", NULL
);
371 cached_refs
.did_loose
= 1;
373 return cached_refs
.loose
;
376 /* We allow "recursive" symbolic refs. Only within reason, though */
378 #define MAXREFLEN (1024)
380 static int resolve_gitlink_packed_ref(char *name
, int pathlen
, const char *refname
, unsigned char *result
)
383 struct cached_refs refs
;
384 struct ref_list
*ref
;
387 strcpy(name
+ pathlen
, "packed-refs");
388 f
= fopen(name
, "r");
391 read_packed_refs(f
, &refs
);
396 if (!strcmp(ref
->name
, refname
)) {
398 memcpy(result
, ref
->sha1
, 20);
403 free_ref_list(refs
.packed
);
407 static int resolve_gitlink_ref_recursive(char *name
, int pathlen
, const char *refname
, unsigned char *result
, int recursion
)
409 int fd
, len
= strlen(refname
);
410 char buffer
[128], *p
;
412 if (recursion
> MAXDEPTH
|| len
> MAXREFLEN
)
414 memcpy(name
+ pathlen
, refname
, len
+1);
415 fd
= open(name
, O_RDONLY
);
417 return resolve_gitlink_packed_ref(name
, pathlen
, refname
, result
);
419 len
= read(fd
, buffer
, sizeof(buffer
)-1);
423 while (len
&& isspace(buffer
[len
-1]))
427 /* Was it a detached head or an old-fashioned symlink? */
428 if (!get_sha1_hex(buffer
, result
))
432 if (strncmp(buffer
, "ref:", 4))
438 return resolve_gitlink_ref_recursive(name
, pathlen
, p
, result
, recursion
+1);
441 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *result
)
443 int len
= strlen(path
), retval
;
447 while (len
&& path
[len
-1] == '/')
451 gitdir
= xmalloc(len
+ MAXREFLEN
+ 8);
452 memcpy(gitdir
, path
, len
);
453 memcpy(gitdir
+ len
, "/.git", 6);
456 tmp
= read_gitfile(gitdir
);
460 gitdir
= xmalloc(len
+ MAXREFLEN
+ 3);
461 memcpy(gitdir
, tmp
, len
);
464 gitdir
[++len
] = '\0';
465 retval
= resolve_gitlink_ref_recursive(gitdir
, len
, refname
, result
, 0);
471 * Try to read ref from the packed references. On success, set sha1
472 * and return 0; otherwise, return -1.
474 static int get_packed_ref(const char *ref
, unsigned char *sha1
)
476 struct ref_list
*list
= get_packed_refs(NULL
);
478 if (!strcmp(ref
, list
->name
)) {
479 hashcpy(sha1
, list
->sha1
);
487 const char *resolve_ref(const char *ref
, unsigned char *sha1
, int reading
, int *flag
)
489 int depth
= MAXDEPTH
;
492 static char ref_buffer
[256];
498 if (check_refname_format(ref
, REFNAME_ALLOW_ONELEVEL
))
509 git_snpath(path
, sizeof(path
), "%s", ref
);
511 if (lstat(path
, &st
) < 0) {
515 * The loose reference file does not exist;
516 * check for a packed reference.
518 if (!get_packed_ref(ref
, sha1
)) {
520 *flag
|= REF_ISPACKED
;
523 /* The reference is not a packed reference, either. */
532 /* Follow "normalized" - ie "refs/.." symlinks by hand */
533 if (S_ISLNK(st
.st_mode
)) {
534 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
538 if (!prefixcmp(buffer
, "refs/") &&
539 !check_refname_format(buffer
, 0)) {
540 strcpy(ref_buffer
, buffer
);
543 *flag
|= REF_ISSYMREF
;
548 /* Is it a directory? */
549 if (S_ISDIR(st
.st_mode
)) {
555 * Anything else, just open it and try to use it as
558 fd
= open(path
, O_RDONLY
);
561 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
565 while (len
&& isspace(buffer
[len
-1]))
570 * Is it a symbolic ref?
572 if (prefixcmp(buffer
, "ref:"))
575 while (isspace(*buf
))
577 if (check_refname_format(buf
, REFNAME_ALLOW_ONELEVEL
)) {
578 warning("symbolic reference in %s is formatted incorrectly",
582 ref
= strcpy(ref_buffer
, buf
);
584 *flag
|= REF_ISSYMREF
;
586 /* Please note that FETCH_HEAD has a second line containing other data. */
587 if (get_sha1_hex(buffer
, sha1
) || (buffer
[40] != '\0' && !isspace(buffer
[40]))) {
588 warning("reference in %s is formatted incorrectly", path
);
594 /* The argument to filter_refs */
601 int read_ref(const char *ref
, unsigned char *sha1
)
603 if (resolve_ref(ref
, sha1
, 1, NULL
))
608 #define DO_FOR_EACH_INCLUDE_BROKEN 01
609 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
610 int flags
, void *cb_data
, struct ref_list
*entry
)
612 if (prefixcmp(entry
->name
, base
))
615 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
616 if (entry
->flag
& REF_BROKEN
)
617 return 0; /* ignore dangling symref */
618 if (!has_sha1_file(entry
->sha1
)) {
619 error("%s does not point to a valid object!", entry
->name
);
624 return fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
627 static int filter_refs(const char *ref
, const unsigned char *sha
, int flags
,
630 struct ref_filter
*filter
= (struct ref_filter
*)data
;
631 if (fnmatch(filter
->pattern
, ref
, 0))
633 return filter
->fn(ref
, sha
, flags
, filter
->cb_data
);
636 int peel_ref(const char *ref
, unsigned char *sha1
)
639 unsigned char base
[20];
642 if (current_ref
&& (current_ref
->name
== ref
643 || !strcmp(current_ref
->name
, ref
))) {
644 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
645 hashcpy(sha1
, current_ref
->peeled
);
648 hashcpy(base
, current_ref
->sha1
);
652 if (!resolve_ref(ref
, base
, 1, &flag
))
655 if ((flag
& REF_ISPACKED
)) {
656 struct ref_list
*list
= get_packed_refs(NULL
);
659 if (!strcmp(list
->name
, ref
)) {
660 if (list
->flag
& REF_KNOWS_PEELED
) {
661 hashcpy(sha1
, list
->peeled
);
664 /* older pack-refs did not leave peeled ones */
672 o
= parse_object(base
);
673 if (o
&& o
->type
== OBJ_TAG
) {
674 o
= deref_tag(o
, ref
, 0);
676 hashcpy(sha1
, o
->sha1
);
683 static int do_for_each_ref(const char *submodule
, const char *base
, each_ref_fn fn
,
684 int trim
, int flags
, void *cb_data
)
687 struct ref_list
*packed
= get_packed_refs(submodule
);
688 struct ref_list
*loose
= get_loose_refs(submodule
);
690 struct ref_list
*extra
;
692 for (extra
= extra_refs
; extra
; extra
= extra
->next
)
693 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, extra
);
695 while (packed
&& loose
) {
696 struct ref_list
*entry
;
697 int cmp
= strcmp(packed
->name
, loose
->name
);
699 packed
= packed
->next
;
707 packed
= packed
->next
;
709 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, entry
);
714 for (packed
= packed
? packed
: loose
; packed
; packed
= packed
->next
) {
715 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, packed
);
726 static int do_head_ref(const char *submodule
, each_ref_fn fn
, void *cb_data
)
728 unsigned char sha1
[20];
732 if (resolve_gitlink_ref(submodule
, "HEAD", sha1
) == 0)
733 return fn("HEAD", sha1
, 0, cb_data
);
738 if (resolve_ref("HEAD", sha1
, 1, &flag
))
739 return fn("HEAD", sha1
, flag
, cb_data
);
744 int head_ref(each_ref_fn fn
, void *cb_data
)
746 return do_head_ref(NULL
, fn
, cb_data
);
749 int head_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
751 return do_head_ref(submodule
, fn
, cb_data
);
754 int for_each_ref(each_ref_fn fn
, void *cb_data
)
756 return do_for_each_ref(NULL
, "", fn
, 0, 0, cb_data
);
759 int for_each_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
761 return do_for_each_ref(submodule
, "", fn
, 0, 0, cb_data
);
764 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
766 return do_for_each_ref(NULL
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
769 int for_each_ref_in_submodule(const char *submodule
, const char *prefix
,
770 each_ref_fn fn
, void *cb_data
)
772 return do_for_each_ref(submodule
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
775 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
777 return for_each_ref_in("refs/tags/", fn
, cb_data
);
780 int for_each_tag_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
782 return for_each_ref_in_submodule(submodule
, "refs/tags/", fn
, cb_data
);
785 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
787 return for_each_ref_in("refs/heads/", fn
, cb_data
);
790 int for_each_branch_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
792 return for_each_ref_in_submodule(submodule
, "refs/heads/", fn
, cb_data
);
795 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
797 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
800 int for_each_remote_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
802 return for_each_ref_in_submodule(submodule
, "refs/remotes/", fn
, cb_data
);
805 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
807 return do_for_each_ref(NULL
, "refs/replace/", fn
, 13, 0, cb_data
);
810 int head_ref_namespaced(each_ref_fn fn
, void *cb_data
)
812 struct strbuf buf
= STRBUF_INIT
;
814 unsigned char sha1
[20];
817 strbuf_addf(&buf
, "%sHEAD", get_git_namespace());
818 if (resolve_ref(buf
.buf
, sha1
, 1, &flag
))
819 ret
= fn(buf
.buf
, sha1
, flag
, cb_data
);
820 strbuf_release(&buf
);
825 int for_each_namespaced_ref(each_ref_fn fn
, void *cb_data
)
827 struct strbuf buf
= STRBUF_INIT
;
829 strbuf_addf(&buf
, "%srefs/", get_git_namespace());
830 ret
= do_for_each_ref(NULL
, buf
.buf
, fn
, 0, 0, cb_data
);
831 strbuf_release(&buf
);
835 int for_each_glob_ref_in(each_ref_fn fn
, const char *pattern
,
836 const char *prefix
, void *cb_data
)
838 struct strbuf real_pattern
= STRBUF_INIT
;
839 struct ref_filter filter
;
842 if (!prefix
&& prefixcmp(pattern
, "refs/"))
843 strbuf_addstr(&real_pattern
, "refs/");
845 strbuf_addstr(&real_pattern
, prefix
);
846 strbuf_addstr(&real_pattern
, pattern
);
848 if (!has_glob_specials(pattern
)) {
849 /* Append implied '/' '*' if not present. */
850 if (real_pattern
.buf
[real_pattern
.len
- 1] != '/')
851 strbuf_addch(&real_pattern
, '/');
852 /* No need to check for '*', there is none. */
853 strbuf_addch(&real_pattern
, '*');
856 filter
.pattern
= real_pattern
.buf
;
858 filter
.cb_data
= cb_data
;
859 ret
= for_each_ref(filter_refs
, &filter
);
861 strbuf_release(&real_pattern
);
865 int for_each_glob_ref(each_ref_fn fn
, const char *pattern
, void *cb_data
)
867 return for_each_glob_ref_in(fn
, pattern
, NULL
, cb_data
);
870 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
872 return do_for_each_ref(NULL
, "", fn
, 0,
873 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
877 * Make sure "ref" is something reasonable to have under ".git/refs/";
878 * We do not like it if:
880 * - any path component of it begins with ".", or
881 * - it has double dots "..", or
882 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
883 * - it ends with a "/".
884 * - it ends with ".lock"
885 * - it contains a "\" (backslash)
888 /* Return true iff ch is not allowed in reference names. */
889 static inline int bad_ref_char(int ch
)
891 if (((unsigned) ch
) <= ' ' || ch
== 0x7f ||
892 ch
== '~' || ch
== '^' || ch
== ':' || ch
== '\\')
894 /* 2.13 Pattern Matching Notation */
895 if (ch
== '*' || ch
== '?' || ch
== '[') /* Unsupported */
901 * Try to read one refname component from the front of ref. Return
902 * the length of the component found, or -1 if the component is not
905 static int check_refname_component(const char *ref
, int flags
)
910 for (cp
= ref
; ; cp
++) {
912 if (ch
== '\0' || ch
== '/')
914 if (bad_ref_char(ch
))
915 return -1; /* Illegal character in refname. */
916 if (last
== '.' && ch
== '.')
917 return -1; /* Refname contains "..". */
918 if (last
== '@' && ch
== '{')
919 return -1; /* Refname contains "@{". */
923 return -1; /* Component has zero length. */
925 if (!(flags
& REFNAME_DOT_COMPONENT
))
926 return -1; /* Component starts with '.'. */
928 * Even if leading dots are allowed, don't allow "."
929 * as a component (".." is prevented by a rule above).
932 return -1; /* Component equals ".". */
934 if (cp
- ref
>= 5 && !memcmp(cp
- 5, ".lock", 5))
935 return -1; /* Refname ends with ".lock". */
939 int check_refname_format(const char *ref
, int flags
)
941 int component_len
, component_count
= 0;
944 /* We are at the start of a path component. */
945 component_len
= check_refname_component(ref
, flags
);
946 if (component_len
< 0) {
947 if ((flags
& REFNAME_REFSPEC_PATTERN
) &&
949 (ref
[1] == '\0' || ref
[1] == '/')) {
950 /* Accept one wildcard as a full refname component. */
951 flags
&= ~REFNAME_REFSPEC_PATTERN
;
958 if (ref
[component_len
] == '\0')
960 /* Skip to next component. */
961 ref
+= component_len
+ 1;
964 if (ref
[component_len
- 1] == '.')
965 return -1; /* Refname ends with '.'. */
966 if (!(flags
& REFNAME_ALLOW_ONELEVEL
) && component_count
< 2)
967 return -1; /* Refname has only one component. */
971 const char *prettify_refname(const char *name
)
974 !prefixcmp(name
, "refs/heads/") ? 11 :
975 !prefixcmp(name
, "refs/tags/") ? 10 :
976 !prefixcmp(name
, "refs/remotes/") ? 13 :
980 const char *ref_rev_parse_rules
[] = {
986 "refs/remotes/%.*s/HEAD",
990 const char *ref_fetch_rules
[] = {
997 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
1000 const int abbrev_name_len
= strlen(abbrev_name
);
1002 for (p
= rules
; *p
; p
++) {
1003 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
1011 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
1012 const unsigned char *old_sha1
, int mustexist
)
1014 if (!resolve_ref(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
1015 error("Can't verify ref %s", lock
->ref_name
);
1019 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
1020 error("Ref %s is at %s but expected %s", lock
->ref_name
,
1021 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
1028 static int remove_empty_directories(const char *file
)
1030 /* we want to create a file but there is a directory there;
1031 * if that is an empty directory (or a directory that contains
1032 * only empty directories), remove them.
1037 strbuf_init(&path
, 20);
1038 strbuf_addstr(&path
, file
);
1040 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
1042 strbuf_release(&path
);
1047 static int is_refname_available(const char *ref
, const char *oldref
,
1048 struct ref_list
*list
, int quiet
)
1050 int namlen
= strlen(ref
); /* e.g. 'foo/bar' */
1052 /* list->name could be 'foo' or 'foo/bar/baz' */
1053 if (!oldref
|| strcmp(oldref
, list
->name
)) {
1054 int len
= strlen(list
->name
);
1055 int cmplen
= (namlen
< len
) ? namlen
: len
;
1056 const char *lead
= (namlen
< len
) ? list
->name
: ref
;
1057 if (!strncmp(ref
, list
->name
, cmplen
) &&
1058 lead
[cmplen
] == '/') {
1060 error("'%s' exists; cannot create '%s'",
1070 static struct ref_lock
*lock_ref_sha1_basic(const char *ref
, const unsigned char *old_sha1
, int flags
, int *type_p
)
1073 const char *orig_ref
= ref
;
1074 struct ref_lock
*lock
;
1077 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1080 lock
= xcalloc(1, sizeof(struct ref_lock
));
1083 ref
= resolve_ref(ref
, lock
->old_sha1
, mustexist
, &type
);
1084 if (!ref
&& errno
== EISDIR
) {
1085 /* we are trying to lock foo but we used to
1086 * have foo/bar which now does not exist;
1087 * it is normal for the empty directory 'foo'
1090 ref_file
= git_path("%s", orig_ref
);
1091 if (remove_empty_directories(ref_file
)) {
1093 error("there are still refs under '%s'", orig_ref
);
1096 ref
= resolve_ref(orig_ref
, lock
->old_sha1
, mustexist
, &type
);
1102 error("unable to resolve reference %s: %s",
1103 orig_ref
, strerror(errno
));
1106 missing
= is_null_sha1(lock
->old_sha1
);
1107 /* When the ref did not exist and we are creating it,
1108 * make sure there is no existing ref that is packed
1109 * whose name begins with our refname, nor a ref whose
1110 * name is a proper prefix of our refname.
1113 !is_refname_available(ref
, NULL
, get_packed_refs(NULL
), 0)) {
1114 last_errno
= ENOTDIR
;
1118 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1120 lflags
= LOCK_DIE_ON_ERROR
;
1121 if (flags
& REF_NODEREF
) {
1123 lflags
|= LOCK_NODEREF
;
1125 lock
->ref_name
= xstrdup(ref
);
1126 lock
->orig_ref_name
= xstrdup(orig_ref
);
1127 ref_file
= git_path("%s", ref
);
1129 lock
->force_write
= 1;
1130 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
1131 lock
->force_write
= 1;
1133 if (safe_create_leading_directories(ref_file
)) {
1135 error("unable to create directory for %s", ref_file
);
1139 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
1140 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
1148 struct ref_lock
*lock_ref_sha1(const char *ref
, const unsigned char *old_sha1
)
1150 char refpath
[PATH_MAX
];
1151 if (check_refname_format(ref
, 0))
1153 strcpy(refpath
, mkpath("refs/%s", ref
));
1154 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
1157 struct ref_lock
*lock_any_ref_for_update(const char *ref
, const unsigned char *old_sha1
, int flags
)
1159 if (check_refname_format(ref
, REFNAME_ALLOW_ONELEVEL
))
1161 return lock_ref_sha1_basic(ref
, old_sha1
, flags
, NULL
);
1164 static struct lock_file packlock
;
1166 static int repack_without_ref(const char *refname
)
1168 struct ref_list
*list
, *packed_ref_list
;
1172 packed_ref_list
= get_packed_refs(NULL
);
1173 for (list
= packed_ref_list
; list
; list
= list
->next
) {
1174 if (!strcmp(refname
, list
->name
)) {
1181 fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
1183 unable_to_lock_error(git_path("packed-refs"), errno
);
1184 return error("cannot delete '%s' from packed refs", refname
);
1187 for (list
= packed_ref_list
; list
; list
= list
->next
) {
1188 char line
[PATH_MAX
+ 100];
1191 if (!strcmp(refname
, list
->name
))
1193 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1194 sha1_to_hex(list
->sha1
), list
->name
);
1195 /* this should not happen but just being defensive */
1196 if (len
> sizeof(line
))
1197 die("too long a refname '%s'", list
->name
);
1198 write_or_die(fd
, line
, len
);
1200 return commit_lock_file(&packlock
);
1203 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1205 struct ref_lock
*lock
;
1206 int err
, i
= 0, ret
= 0, flag
= 0;
1208 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1211 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1215 if (!(delopt
& REF_NODEREF
)) {
1216 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1217 lock
->lk
->filename
[i
] = 0;
1218 path
= lock
->lk
->filename
;
1220 path
= git_path("%s", refname
);
1222 err
= unlink_or_warn(path
);
1223 if (err
&& errno
!= ENOENT
)
1226 if (!(delopt
& REF_NODEREF
))
1227 lock
->lk
->filename
[i
] = '.';
1229 /* removing the loose one could have resurrected an earlier
1230 * packed one. Also, if it was not loose we need to repack
1233 ret
|= repack_without_ref(refname
);
1235 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1236 invalidate_cached_refs();
1242 * People using contrib's git-new-workdir have .git/logs/refs ->
1243 * /some/other/path/.git/logs/refs, and that may live on another device.
1245 * IOW, to avoid cross device rename errors, the temporary renamed log must
1246 * live into logs/refs.
1248 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1250 int rename_ref(const char *oldref
, const char *newref
, const char *logmsg
)
1252 static const char renamed_ref
[] = "RENAMED-REF";
1253 unsigned char sha1
[20], orig_sha1
[20];
1254 int flag
= 0, logmoved
= 0;
1255 struct ref_lock
*lock
;
1256 struct stat loginfo
;
1257 int log
= !lstat(git_path("logs/%s", oldref
), &loginfo
);
1258 const char *symref
= NULL
;
1260 if (log
&& S_ISLNK(loginfo
.st_mode
))
1261 return error("reflog for %s is a symlink", oldref
);
1263 symref
= resolve_ref(oldref
, orig_sha1
, 1, &flag
);
1264 if (flag
& REF_ISSYMREF
)
1265 return error("refname %s is a symbolic ref, renaming it is not supported",
1268 return error("refname %s not found", oldref
);
1270 if (!is_refname_available(newref
, oldref
, get_packed_refs(NULL
), 0))
1273 if (!is_refname_available(newref
, oldref
, get_loose_refs(NULL
), 0))
1276 lock
= lock_ref_sha1_basic(renamed_ref
, NULL
, 0, NULL
);
1278 return error("unable to lock %s", renamed_ref
);
1279 lock
->force_write
= 1;
1280 if (write_ref_sha1(lock
, orig_sha1
, logmsg
))
1281 return error("unable to save current sha1 in %s", renamed_ref
);
1283 if (log
&& rename(git_path("logs/%s", oldref
), git_path(TMP_RENAMED_LOG
)))
1284 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG
": %s",
1285 oldref
, strerror(errno
));
1287 if (delete_ref(oldref
, orig_sha1
, REF_NODEREF
)) {
1288 error("unable to delete old %s", oldref
);
1292 if (resolve_ref(newref
, sha1
, 1, &flag
) && delete_ref(newref
, sha1
, REF_NODEREF
)) {
1293 if (errno
==EISDIR
) {
1294 if (remove_empty_directories(git_path("%s", newref
))) {
1295 error("Directory not empty: %s", newref
);
1299 error("unable to delete existing %s", newref
);
1304 if (log
&& safe_create_leading_directories(git_path("logs/%s", newref
))) {
1305 error("unable to create directory for %s", newref
);
1310 if (log
&& rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", newref
))) {
1311 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1313 * rename(a, b) when b is an existing
1314 * directory ought to result in ISDIR, but
1315 * Solaris 5.8 gives ENOTDIR. Sheesh.
1317 if (remove_empty_directories(git_path("logs/%s", newref
))) {
1318 error("Directory not empty: logs/%s", newref
);
1323 error("unable to move logfile "TMP_RENAMED_LOG
" to logs/%s: %s",
1324 newref
, strerror(errno
));
1330 lock
= lock_ref_sha1_basic(newref
, NULL
, 0, NULL
);
1332 error("unable to lock %s for update", newref
);
1335 lock
->force_write
= 1;
1336 hashcpy(lock
->old_sha1
, orig_sha1
);
1337 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1338 error("unable to write current sha1 into %s", newref
);
1345 lock
= lock_ref_sha1_basic(oldref
, NULL
, 0, NULL
);
1347 error("unable to lock %s for rollback", oldref
);
1351 lock
->force_write
= 1;
1352 flag
= log_all_ref_updates
;
1353 log_all_ref_updates
= 0;
1354 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1355 error("unable to write current sha1 into %s", oldref
);
1356 log_all_ref_updates
= flag
;
1359 if (logmoved
&& rename(git_path("logs/%s", newref
), git_path("logs/%s", oldref
)))
1360 error("unable to restore logfile %s from %s: %s",
1361 oldref
, newref
, strerror(errno
));
1362 if (!logmoved
&& log
&&
1363 rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", oldref
)))
1364 error("unable to restore logfile %s from "TMP_RENAMED_LOG
": %s",
1365 oldref
, strerror(errno
));
1370 int close_ref(struct ref_lock
*lock
)
1372 if (close_lock_file(lock
->lk
))
1378 int commit_ref(struct ref_lock
*lock
)
1380 if (commit_lock_file(lock
->lk
))
1386 void unlock_ref(struct ref_lock
*lock
)
1388 /* Do not free lock->lk -- atexit() still looks at them */
1390 rollback_lock_file(lock
->lk
);
1391 free(lock
->ref_name
);
1392 free(lock
->orig_ref_name
);
1397 * copy the reflog message msg to buf, which has been allocated sufficiently
1398 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1399 * because reflog file is one line per entry.
1401 static int copy_msg(char *buf
, const char *msg
)
1408 while ((c
= *msg
++)) {
1409 if (wasspace
&& isspace(c
))
1411 wasspace
= isspace(c
);
1416 while (buf
< cp
&& isspace(cp
[-1]))
1422 int log_ref_setup(const char *ref_name
, char *logfile
, int bufsize
)
1424 int logfd
, oflags
= O_APPEND
| O_WRONLY
;
1426 git_snpath(logfile
, bufsize
, "logs/%s", ref_name
);
1427 if (log_all_ref_updates
&&
1428 (!prefixcmp(ref_name
, "refs/heads/") ||
1429 !prefixcmp(ref_name
, "refs/remotes/") ||
1430 !prefixcmp(ref_name
, "refs/notes/") ||
1431 !strcmp(ref_name
, "HEAD"))) {
1432 if (safe_create_leading_directories(logfile
) < 0)
1433 return error("unable to create directory for %s",
1438 logfd
= open(logfile
, oflags
, 0666);
1440 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1443 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1444 if (remove_empty_directories(logfile
)) {
1445 return error("There are still logs under '%s'",
1448 logfd
= open(logfile
, oflags
, 0666);
1452 return error("Unable to append to %s: %s",
1453 logfile
, strerror(errno
));
1456 adjust_shared_perm(logfile
);
1461 static int log_ref_write(const char *ref_name
, const unsigned char *old_sha1
,
1462 const unsigned char *new_sha1
, const char *msg
)
1464 int logfd
, result
, written
, oflags
= O_APPEND
| O_WRONLY
;
1465 unsigned maxlen
, len
;
1467 char log_file
[PATH_MAX
];
1469 const char *committer
;
1471 if (log_all_ref_updates
< 0)
1472 log_all_ref_updates
= !is_bare_repository();
1474 result
= log_ref_setup(ref_name
, log_file
, sizeof(log_file
));
1478 logfd
= open(log_file
, oflags
);
1481 msglen
= msg
? strlen(msg
) : 0;
1482 committer
= git_committer_info(0);
1483 maxlen
= strlen(committer
) + msglen
+ 100;
1484 logrec
= xmalloc(maxlen
);
1485 len
= sprintf(logrec
, "%s %s %s\n",
1486 sha1_to_hex(old_sha1
),
1487 sha1_to_hex(new_sha1
),
1490 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1491 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1493 if (close(logfd
) != 0 || written
!= len
)
1494 return error("Unable to append to %s", log_file
);
1498 static int is_branch(const char *refname
)
1500 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1503 int write_ref_sha1(struct ref_lock
*lock
,
1504 const unsigned char *sha1
, const char *logmsg
)
1506 static char term
= '\n';
1511 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1515 o
= parse_object(sha1
);
1517 error("Trying to write ref %s with nonexistent object %s",
1518 lock
->ref_name
, sha1_to_hex(sha1
));
1522 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1523 error("Trying to write non-commit object %s to branch %s",
1524 sha1_to_hex(sha1
), lock
->ref_name
);
1528 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1529 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1530 || close_ref(lock
) < 0) {
1531 error("Couldn't write %s", lock
->lk
->filename
);
1535 invalidate_cached_refs();
1536 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1537 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1538 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1542 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1544 * Special hack: If a branch is updated directly and HEAD
1545 * points to it (may happen on the remote side of a push
1546 * for example) then logically the HEAD reflog should be
1548 * A generic solution implies reverse symref information,
1549 * but finding all symrefs pointing to the given branch
1550 * would be rather costly for this rare event (the direct
1551 * update of a branch) to be worth it. So let's cheat and
1552 * check with HEAD only which should cover 99% of all usage
1553 * scenarios (even 100% of the default ones).
1555 unsigned char head_sha1
[20];
1557 const char *head_ref
;
1558 head_ref
= resolve_ref("HEAD", head_sha1
, 1, &head_flag
);
1559 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1560 !strcmp(head_ref
, lock
->ref_name
))
1561 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1563 if (commit_ref(lock
)) {
1564 error("Couldn't set %s", lock
->ref_name
);
1572 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1575 const char *lockpath
;
1577 int fd
, len
, written
;
1578 char *git_HEAD
= git_pathdup("%s", ref_target
);
1579 unsigned char old_sha1
[20], new_sha1
[20];
1581 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1584 if (safe_create_leading_directories(git_HEAD
) < 0)
1585 return error("unable to create directory for %s", git_HEAD
);
1587 #ifndef NO_SYMLINK_HEAD
1588 if (prefer_symlink_refs
) {
1590 if (!symlink(refs_heads_master
, git_HEAD
))
1592 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1596 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1597 if (sizeof(ref
) <= len
) {
1598 error("refname too long: %s", refs_heads_master
);
1599 goto error_free_return
;
1601 lockpath
= mkpath("%s.lock", git_HEAD
);
1602 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1604 error("Unable to open %s for writing", lockpath
);
1605 goto error_free_return
;
1607 written
= write_in_full(fd
, ref
, len
);
1608 if (close(fd
) != 0 || written
!= len
) {
1609 error("Unable to write to %s", lockpath
);
1610 goto error_unlink_return
;
1612 if (rename(lockpath
, git_HEAD
) < 0) {
1613 error("Unable to create %s", git_HEAD
);
1614 goto error_unlink_return
;
1616 if (adjust_shared_perm(git_HEAD
)) {
1617 error("Unable to fix permissions on %s", lockpath
);
1618 error_unlink_return
:
1619 unlink_or_warn(lockpath
);
1625 #ifndef NO_SYMLINK_HEAD
1628 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1629 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1635 static char *ref_msg(const char *line
, const char *endp
)
1639 ep
= memchr(line
, '\n', endp
- line
);
1642 return xmemdupz(line
, ep
- line
);
1645 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
)
1647 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1649 int logfd
, tz
, reccnt
= 0;
1652 unsigned char logged_sha1
[20];
1656 logfile
= git_path("logs/%s", ref
);
1657 logfd
= open(logfile
, O_RDONLY
, 0);
1659 die_errno("Unable to read log '%s'", logfile
);
1662 die("Log %s is empty.", logfile
);
1663 mapsz
= xsize_t(st
.st_size
);
1664 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1665 logdata
= log_mapped
;
1669 rec
= logend
= logdata
+ st
.st_size
;
1670 while (logdata
< rec
) {
1672 if (logdata
< rec
&& *(rec
-1) == '\n')
1675 while (logdata
< rec
&& *(rec
-1) != '\n') {
1681 die("Log %s is corrupt.", logfile
);
1682 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1683 if (date
<= at_time
|| cnt
== 0) {
1684 tz
= strtoul(tz_c
, NULL
, 10);
1686 *msg
= ref_msg(rec
, logend
);
1688 *cutoff_time
= date
;
1692 *cutoff_cnt
= reccnt
- 1;
1694 if (get_sha1_hex(lastrec
, logged_sha1
))
1695 die("Log %s is corrupt.", logfile
);
1696 if (get_sha1_hex(rec
+ 41, sha1
))
1697 die("Log %s is corrupt.", logfile
);
1698 if (hashcmp(logged_sha1
, sha1
)) {
1699 warning("Log %s has gap after %s.",
1700 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1703 else if (date
== at_time
) {
1704 if (get_sha1_hex(rec
+ 41, sha1
))
1705 die("Log %s is corrupt.", logfile
);
1708 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1709 die("Log %s is corrupt.", logfile
);
1710 if (hashcmp(logged_sha1
, sha1
)) {
1711 warning("Log %s unexpectedly ended on %s.",
1712 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1715 munmap(log_mapped
, mapsz
);
1724 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1726 if (rec
== logend
|| *rec
== '\n')
1727 die("Log %s is corrupt.", logfile
);
1728 date
= strtoul(rec
+ 1, &tz_c
, 10);
1729 tz
= strtoul(tz_c
, NULL
, 10);
1730 if (get_sha1_hex(logdata
, sha1
))
1731 die("Log %s is corrupt.", logfile
);
1732 if (is_null_sha1(sha1
)) {
1733 if (get_sha1_hex(logdata
+ 41, sha1
))
1734 die("Log %s is corrupt.", logfile
);
1737 *msg
= ref_msg(logdata
, logend
);
1738 munmap(log_mapped
, mapsz
);
1741 *cutoff_time
= date
;
1745 *cutoff_cnt
= reccnt
;
1749 int for_each_recent_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1751 const char *logfile
;
1753 struct strbuf sb
= STRBUF_INIT
;
1756 logfile
= git_path("logs/%s", ref
);
1757 logfp
= fopen(logfile
, "r");
1762 struct stat statbuf
;
1763 if (fstat(fileno(logfp
), &statbuf
) ||
1764 statbuf
.st_size
< ofs
||
1765 fseek(logfp
, -ofs
, SEEK_END
) ||
1766 strbuf_getwholeline(&sb
, logfp
, '\n')) {
1768 strbuf_release(&sb
);
1773 while (!strbuf_getwholeline(&sb
, logfp
, '\n')) {
1774 unsigned char osha1
[20], nsha1
[20];
1775 char *email_end
, *message
;
1776 unsigned long timestamp
;
1779 /* old SP new SP name <email> SP time TAB msg LF */
1780 if (sb
.len
< 83 || sb
.buf
[sb
.len
- 1] != '\n' ||
1781 get_sha1_hex(sb
.buf
, osha1
) || sb
.buf
[40] != ' ' ||
1782 get_sha1_hex(sb
.buf
+ 41, nsha1
) || sb
.buf
[81] != ' ' ||
1783 !(email_end
= strchr(sb
.buf
+ 82, '>')) ||
1784 email_end
[1] != ' ' ||
1785 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1786 !message
|| message
[0] != ' ' ||
1787 (message
[1] != '+' && message
[1] != '-') ||
1788 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1789 !isdigit(message
[4]) || !isdigit(message
[5]))
1790 continue; /* corrupt? */
1791 email_end
[1] = '\0';
1792 tz
= strtol(message
+ 1, NULL
, 10);
1793 if (message
[6] != '\t')
1797 ret
= fn(osha1
, nsha1
, sb
.buf
+ 82, timestamp
, tz
, message
,
1803 strbuf_release(&sb
);
1807 int for_each_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, void *cb_data
)
1809 return for_each_recent_reflog_ent(ref
, fn
, 0, cb_data
);
1812 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
1814 DIR *dir
= opendir(git_path("logs/%s", base
));
1819 int baselen
= strlen(base
);
1820 char *log
= xmalloc(baselen
+ 257);
1822 memcpy(log
, base
, baselen
);
1823 if (baselen
&& base
[baselen
-1] != '/')
1824 log
[baselen
++] = '/';
1826 while ((de
= readdir(dir
)) != NULL
) {
1830 if (de
->d_name
[0] == '.')
1832 namelen
= strlen(de
->d_name
);
1835 if (has_extension(de
->d_name
, ".lock"))
1837 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
1838 if (stat(git_path("logs/%s", log
), &st
) < 0)
1840 if (S_ISDIR(st
.st_mode
)) {
1841 retval
= do_for_each_reflog(log
, fn
, cb_data
);
1843 unsigned char sha1
[20];
1844 if (!resolve_ref(log
, sha1
, 0, NULL
))
1845 retval
= error("bad ref for %s", log
);
1847 retval
= fn(log
, sha1
, 0, cb_data
);
1860 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
1862 return do_for_each_reflog("", fn
, cb_data
);
1865 int update_ref(const char *action
, const char *refname
,
1866 const unsigned char *sha1
, const unsigned char *oldval
,
1867 int flags
, enum action_on_err onerr
)
1869 static struct ref_lock
*lock
;
1870 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
1872 const char *str
= "Cannot lock the ref '%s'.";
1874 case MSG_ON_ERR
: error(str
, refname
); break;
1875 case DIE_ON_ERR
: die(str
, refname
); break;
1876 case QUIET_ON_ERR
: break;
1880 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
1881 const char *str
= "Cannot update the ref '%s'.";
1883 case MSG_ON_ERR
: error(str
, refname
); break;
1884 case DIE_ON_ERR
: die(str
, refname
); break;
1885 case QUIET_ON_ERR
: break;
1892 int ref_exists(char *refname
)
1894 unsigned char sha1
[20];
1895 return !!resolve_ref(refname
, sha1
, 1, NULL
);
1898 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
1900 for ( ; list
; list
= list
->next
)
1901 if (!strcmp(list
->name
, name
))
1902 return (struct ref
*)list
;
1907 * generate a format suitable for scanf from a ref_rev_parse_rules
1908 * rule, that is replace the "%.*s" spec with a "%s" spec
1910 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
1914 spec
= strstr(rule
, "%.*s");
1915 if (!spec
|| strstr(spec
+ 4, "%.*s"))
1916 die("invalid rule in ref_rev_parse_rules: %s", rule
);
1918 /* copy all until spec */
1919 strncpy(scanf_fmt
, rule
, spec
- rule
);
1920 scanf_fmt
[spec
- rule
] = '\0';
1922 strcat(scanf_fmt
, "%s");
1923 /* copy remaining rule */
1924 strcat(scanf_fmt
, spec
+ 4);
1929 char *shorten_unambiguous_ref(const char *ref
, int strict
)
1932 static char **scanf_fmts
;
1933 static int nr_rules
;
1936 /* pre generate scanf formats from ref_rev_parse_rules[] */
1938 size_t total_len
= 0;
1940 /* the rule list is NULL terminated, count them first */
1941 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
1942 /* no +1 because strlen("%s") < strlen("%.*s") */
1943 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
1945 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
1948 for (i
= 0; i
< nr_rules
; i
++) {
1949 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
1951 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
1952 total_len
+= strlen(ref_rev_parse_rules
[i
]);
1956 /* bail out if there are no rules */
1958 return xstrdup(ref
);
1960 /* buffer for scanf result, at most ref must fit */
1961 short_name
= xstrdup(ref
);
1963 /* skip first rule, it will always match */
1964 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
1966 int rules_to_fail
= i
;
1969 if (1 != sscanf(ref
, scanf_fmts
[i
], short_name
))
1972 short_name_len
= strlen(short_name
);
1975 * in strict mode, all (except the matched one) rules
1976 * must fail to resolve to a valid non-ambiguous ref
1979 rules_to_fail
= nr_rules
;
1982 * check if the short name resolves to a valid ref,
1983 * but use only rules prior to the matched one
1985 for (j
= 0; j
< rules_to_fail
; j
++) {
1986 const char *rule
= ref_rev_parse_rules
[j
];
1987 unsigned char short_objectname
[20];
1988 char refname
[PATH_MAX
];
1990 /* skip matched rule */
1995 * the short name is ambiguous, if it resolves
1996 * (with this previous rule) to a valid ref
1997 * read_ref() returns 0 on success
1999 mksnpath(refname
, sizeof(refname
),
2000 rule
, short_name_len
, short_name
);
2001 if (!read_ref(refname
, short_objectname
))
2006 * short name is non-ambiguous if all previous rules
2007 * haven't resolved to a valid ref
2009 if (j
== rules_to_fail
)
2014 return xstrdup(ref
);