7 /* ISSYMREF=01 and ISPACKED=02 are public interfaces */
8 #define REF_KNOWS_PEELED 04
11 struct ref_list
*next
;
12 unsigned char flag
; /* ISSYMREF? ISPACKED? */
13 unsigned char sha1
[20];
14 unsigned char peeled
[20];
15 char name
[FLEX_ARRAY
];
18 static const char *parse_ref_line(char *line
, unsigned char *sha1
)
21 * 42: the answer to everything.
23 * In this case, it happens to be the answer to
24 * 40 (length of sha1 hex representation)
25 * +1 (space in between hex and name)
26 * +1 (newline at the end of the line)
28 int len
= strlen(line
) - 42;
32 if (get_sha1_hex(line
, sha1
) < 0)
34 if (!isspace(line
[40]))
39 if (line
[len
] != '\n')
46 static struct ref_list
*add_ref(const char *name
, const unsigned char *sha1
,
47 int flag
, struct ref_list
*list
,
48 struct ref_list
**new_entry
)
51 struct ref_list
*entry
;
53 /* Allocate it and add it in.. */
54 len
= strlen(name
) + 1;
55 entry
= xmalloc(sizeof(struct ref_list
) + len
);
56 hashcpy(entry
->sha1
, sha1
);
57 hashclr(entry
->peeled
);
58 memcpy(entry
->name
, name
, len
);
66 /* merge sort the ref list */
67 static struct ref_list
*sort_ref_list(struct ref_list
*list
)
69 int psize
, qsize
, last_merge_count
, cmp
;
70 struct ref_list
*p
, *q
, *l
, *e
;
71 struct ref_list
*new_list
= list
;
79 last_merge_count
= merge_count
;
92 while (psize
< k
&& q
->next
) {
98 while ((psize
> 0) || (qsize
> 0 && q
)) {
99 if (qsize
== 0 || !q
) {
103 } else if (psize
== 0) {
108 cmp
= strcmp(q
->name
, p
->name
);
113 } else if (cmp
> 0) {
118 if (hashcmp(q
->sha1
, p
->sha1
))
119 die("Duplicated ref, and SHA1s don't match: %s",
121 warning("Duplicated ref: %s", q
->name
);
145 } while ((last_merge_count
!= merge_count
) || (last_merge_count
!= 1));
151 * Future: need to be in "struct repository"
152 * when doing a full libification.
154 static struct cached_refs
{
157 struct ref_list
*loose
;
158 struct ref_list
*packed
;
160 static struct ref_list
*current_ref
;
162 static struct ref_list
*extra_refs
;
164 static void free_ref_list(struct ref_list
*list
)
166 struct ref_list
*next
;
167 for ( ; list
; list
= next
) {
173 static void invalidate_cached_refs(void)
175 struct cached_refs
*ca
= &cached_refs
;
177 if (ca
->did_loose
&& ca
->loose
)
178 free_ref_list(ca
->loose
);
179 if (ca
->did_packed
&& ca
->packed
)
180 free_ref_list(ca
->packed
);
181 ca
->loose
= ca
->packed
= NULL
;
182 ca
->did_loose
= ca
->did_packed
= 0;
185 static void read_packed_refs(FILE *f
, struct cached_refs
*cached_refs
)
187 struct ref_list
*list
= NULL
;
188 struct ref_list
*last
= NULL
;
189 char refline
[PATH_MAX
];
190 int flag
= REF_ISPACKED
;
192 while (fgets(refline
, sizeof(refline
), f
)) {
193 unsigned char sha1
[20];
195 static const char header
[] = "# pack-refs with:";
197 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
198 const char *traits
= refline
+ sizeof(header
) - 1;
199 if (strstr(traits
, " peeled "))
200 flag
|= REF_KNOWS_PEELED
;
201 /* perhaps other traits later as well */
205 name
= parse_ref_line(refline
, sha1
);
207 list
= add_ref(name
, sha1
, flag
, list
, &last
);
212 strlen(refline
) == 42 &&
213 refline
[41] == '\n' &&
214 !get_sha1_hex(refline
+ 1, sha1
))
215 hashcpy(last
->peeled
, sha1
);
217 cached_refs
->packed
= sort_ref_list(list
);
220 void add_extra_ref(const char *name
, const unsigned char *sha1
, int flag
)
222 extra_refs
= add_ref(name
, sha1
, flag
, extra_refs
, NULL
);
225 void clear_extra_refs(void)
227 free_ref_list(extra_refs
);
231 static struct ref_list
*get_packed_refs(void)
233 if (!cached_refs
.did_packed
) {
234 FILE *f
= fopen(git_path("packed-refs"), "r");
235 cached_refs
.packed
= NULL
;
237 read_packed_refs(f
, &cached_refs
);
240 cached_refs
.did_packed
= 1;
242 return cached_refs
.packed
;
245 static struct ref_list
*get_ref_dir(const char *base
, struct ref_list
*list
)
247 DIR *dir
= opendir(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];
264 if (de
->d_name
[0] == '.')
266 namelen
= strlen(de
->d_name
);
269 if (has_extension(de
->d_name
, ".lock"))
271 memcpy(ref
+ baselen
, de
->d_name
, namelen
+1);
272 if (stat(git_path("%s", ref
), &st
) < 0)
274 if (S_ISDIR(st
.st_mode
)) {
275 list
= get_ref_dir(ref
, list
);
278 if (!resolve_ref(ref
, sha1
, 1, &flag
))
280 list
= add_ref(ref
, sha1
, flag
, list
, NULL
);
285 return sort_ref_list(list
);
288 struct warn_if_dangling_data
{
293 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
294 int flags
, void *cb_data
)
296 struct warn_if_dangling_data
*d
= cb_data
;
297 const char *resolves_to
;
298 unsigned char junk
[20];
300 if (!(flags
& REF_ISSYMREF
))
303 resolves_to
= resolve_ref(refname
, junk
, 0, NULL
);
304 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
307 printf(d
->msg_fmt
, refname
);
311 void warn_dangling_symref(const char *msg_fmt
, const char *refname
)
313 struct warn_if_dangling_data data
= { refname
, msg_fmt
};
314 for_each_rawref(warn_if_dangling_symref
, &data
);
317 static struct ref_list
*get_loose_refs(void)
319 if (!cached_refs
.did_loose
) {
320 cached_refs
.loose
= get_ref_dir("refs", NULL
);
321 cached_refs
.did_loose
= 1;
323 return cached_refs
.loose
;
326 /* We allow "recursive" symbolic refs. Only within reason, though */
328 #define MAXREFLEN (1024)
330 static int resolve_gitlink_packed_ref(char *name
, int pathlen
, const char *refname
, unsigned char *result
)
333 struct cached_refs refs
;
334 struct ref_list
*ref
;
337 strcpy(name
+ pathlen
, "packed-refs");
338 f
= fopen(name
, "r");
341 read_packed_refs(f
, &refs
);
346 if (!strcmp(ref
->name
, refname
)) {
348 memcpy(result
, ref
->sha1
, 20);
353 free_ref_list(refs
.packed
);
357 static int resolve_gitlink_ref_recursive(char *name
, int pathlen
, const char *refname
, unsigned char *result
, int recursion
)
359 int fd
, len
= strlen(refname
);
360 char buffer
[128], *p
;
362 if (recursion
> MAXDEPTH
|| len
> MAXREFLEN
)
364 memcpy(name
+ pathlen
, refname
, len
+1);
365 fd
= open(name
, O_RDONLY
);
367 return resolve_gitlink_packed_ref(name
, pathlen
, refname
, result
);
369 len
= read(fd
, buffer
, sizeof(buffer
)-1);
373 while (len
&& isspace(buffer
[len
-1]))
377 /* Was it a detached head or an old-fashioned symlink? */
378 if (!get_sha1_hex(buffer
, result
))
382 if (strncmp(buffer
, "ref:", 4))
388 return resolve_gitlink_ref_recursive(name
, pathlen
, p
, result
, recursion
+1);
391 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *result
)
393 int len
= strlen(path
), retval
;
397 while (len
&& path
[len
-1] == '/')
401 gitdir
= xmalloc(len
+ MAXREFLEN
+ 8);
402 memcpy(gitdir
, path
, len
);
403 memcpy(gitdir
+ len
, "/.git", 6);
406 tmp
= read_gitfile_gently(gitdir
);
410 gitdir
= xmalloc(len
+ MAXREFLEN
+ 3);
411 memcpy(gitdir
, tmp
, len
);
414 gitdir
[++len
] = '\0';
415 retval
= resolve_gitlink_ref_recursive(gitdir
, len
, refname
, result
, 0);
421 * If the "reading" argument is set, this function finds out what _object_
422 * the ref points at by "reading" the ref. The ref, if it is not symbolic,
423 * has to exist, and if it is symbolic, it has to point at an existing ref,
424 * because the "read" goes through the symref to the ref it points at.
426 * The access that is not "reading" may often be "writing", but does not
427 * have to; it can be merely checking _where it leads to_. If it is a
428 * prelude to "writing" to the ref, a write to a symref that points at
429 * yet-to-be-born ref will create the real ref pointed by the symref.
430 * reading=0 allows the caller to check where such a symref leads to.
432 const char *resolve_ref(const char *ref
, unsigned char *sha1
, int reading
, int *flag
)
434 int depth
= MAXDEPTH
;
437 static char ref_buffer
[256];
451 git_snpath(path
, sizeof(path
), "%s", ref
);
452 /* Special case: non-existing file. */
453 if (lstat(path
, &st
) < 0) {
454 struct ref_list
*list
= get_packed_refs();
456 if (!strcmp(ref
, list
->name
)) {
457 hashcpy(sha1
, list
->sha1
);
459 *flag
|= REF_ISPACKED
;
464 if (reading
|| errno
!= ENOENT
)
470 /* Follow "normalized" - ie "refs/.." symlinks by hand */
471 if (S_ISLNK(st
.st_mode
)) {
472 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
473 if (len
>= 5 && !memcmp("refs/", buffer
, 5)) {
475 strcpy(ref_buffer
, buffer
);
478 *flag
|= REF_ISSYMREF
;
483 /* Is it a directory? */
484 if (S_ISDIR(st
.st_mode
)) {
490 * Anything else, just open it and try to use it as
493 fd
= open(path
, O_RDONLY
);
496 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
500 * Is it a symbolic ref?
502 if (len
< 4 || memcmp("ref:", buffer
, 4))
506 while (len
&& isspace(*buf
))
508 while (len
&& isspace(buf
[len
-1]))
511 memcpy(ref_buffer
, buf
, len
+ 1);
514 *flag
|= REF_ISSYMREF
;
516 if (len
< 40 || get_sha1_hex(buffer
, sha1
))
521 int read_ref(const char *ref
, unsigned char *sha1
)
523 if (resolve_ref(ref
, sha1
, 1, NULL
))
528 #define DO_FOR_EACH_INCLUDE_BROKEN 01
529 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
530 int flags
, void *cb_data
, struct ref_list
*entry
)
532 if (strncmp(base
, entry
->name
, trim
))
534 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
535 if (is_null_sha1(entry
->sha1
))
537 if (!has_sha1_file(entry
->sha1
)) {
538 error("%s does not point to a valid object!", entry
->name
);
543 return fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
546 int peel_ref(const char *ref
, unsigned char *sha1
)
549 unsigned char base
[20];
552 if (current_ref
&& (current_ref
->name
== ref
553 || !strcmp(current_ref
->name
, ref
))) {
554 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
555 hashcpy(sha1
, current_ref
->peeled
);
558 hashcpy(base
, current_ref
->sha1
);
562 if (!resolve_ref(ref
, base
, 1, &flag
))
565 if ((flag
& REF_ISPACKED
)) {
566 struct ref_list
*list
= get_packed_refs();
569 if (!strcmp(list
->name
, ref
)) {
570 if (list
->flag
& REF_KNOWS_PEELED
) {
571 hashcpy(sha1
, list
->peeled
);
574 /* older pack-refs did not leave peeled ones */
582 o
= parse_object(base
);
583 if (o
&& o
->type
== OBJ_TAG
) {
584 o
= deref_tag(o
, ref
, 0);
586 hashcpy(sha1
, o
->sha1
);
593 static int do_for_each_ref(const char *base
, each_ref_fn fn
, int trim
,
594 int flags
, void *cb_data
)
597 struct ref_list
*packed
= get_packed_refs();
598 struct ref_list
*loose
= get_loose_refs();
600 struct ref_list
*extra
;
602 for (extra
= extra_refs
; extra
; extra
= extra
->next
)
603 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, extra
);
605 while (packed
&& loose
) {
606 struct ref_list
*entry
;
607 int cmp
= strcmp(packed
->name
, loose
->name
);
609 packed
= packed
->next
;
617 packed
= packed
->next
;
619 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, entry
);
624 for (packed
= packed
? packed
: loose
; packed
; packed
= packed
->next
) {
625 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, packed
);
635 int head_ref(each_ref_fn fn
, void *cb_data
)
637 unsigned char sha1
[20];
640 if (resolve_ref("HEAD", sha1
, 1, &flag
))
641 return fn("HEAD", sha1
, flag
, cb_data
);
645 int for_each_ref(each_ref_fn fn
, void *cb_data
)
647 return do_for_each_ref("refs/", fn
, 0, 0, cb_data
);
650 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
652 return do_for_each_ref("refs/tags/", fn
, 10, 0, cb_data
);
655 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
657 return do_for_each_ref("refs/heads/", fn
, 11, 0, cb_data
);
660 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
662 return do_for_each_ref("refs/remotes/", fn
, 13, 0, cb_data
);
665 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
667 return do_for_each_ref("refs/", fn
, 0,
668 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
672 * Make sure "ref" is something reasonable to have under ".git/refs/";
673 * We do not like it if:
675 * - any path component of it begins with ".", or
676 * - it has double dots "..", or
677 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
678 * - it ends with a "/".
679 * - it ends with ".lock"
682 static inline int bad_ref_char(int ch
)
684 if (((unsigned) ch
) <= ' ' ||
685 ch
== '~' || ch
== '^' || ch
== ':')
687 /* 2.13 Pattern Matching Notation */
688 if (ch
== '?' || ch
== '[') /* Unsupported */
690 if (ch
== '*') /* Supported at the end */
695 int check_ref_format(const char *ref
)
697 int ch
, level
, bad_type
, last
;
698 int ret
= CHECK_REF_FORMAT_OK
;
699 const char *cp
= ref
;
703 while ((ch
= *cp
++) == '/')
704 ; /* tolerate duplicated slashes */
706 /* should not end with slashes */
707 return CHECK_REF_FORMAT_ERROR
;
709 /* we are at the beginning of the path component */
711 return CHECK_REF_FORMAT_ERROR
;
712 bad_type
= bad_ref_char(ch
);
714 if (bad_type
== 2 && (!*cp
|| *cp
== '/') &&
715 ret
== CHECK_REF_FORMAT_OK
)
716 ret
= CHECK_REF_FORMAT_WILDCARD
;
718 return CHECK_REF_FORMAT_ERROR
;
722 /* scan the rest of the path component */
723 while ((ch
= *cp
++) != 0) {
724 bad_type
= bad_ref_char(ch
);
726 return CHECK_REF_FORMAT_ERROR
;
729 if (last
== '.' && ch
== '.')
730 return CHECK_REF_FORMAT_ERROR
;
731 if (last
== '@' && ch
== '{')
732 return CHECK_REF_FORMAT_ERROR
;
737 if (ref
<= cp
- 2 && cp
[-2] == '.')
738 return CHECK_REF_FORMAT_ERROR
;
740 return CHECK_REF_FORMAT_ONELEVEL
;
741 if (has_extension(ref
, ".lock"))
742 return CHECK_REF_FORMAT_ERROR
;
748 const char *ref_rev_parse_rules
[] = {
754 "refs/remotes/%.*s/HEAD",
758 const char *ref_fetch_rules
[] = {
765 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
768 const int abbrev_name_len
= strlen(abbrev_name
);
770 for (p
= rules
; *p
; p
++) {
771 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
779 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
780 const unsigned char *old_sha1
, int mustexist
)
782 if (!resolve_ref(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
783 error("Can't verify ref %s", lock
->ref_name
);
787 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
788 error("Ref %s is at %s but expected %s", lock
->ref_name
,
789 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
796 static int remove_empty_directories(const char *file
)
798 /* we want to create a file but there is a directory there;
799 * if that is an empty directory (or a directory that contains
800 * only empty directories), remove them.
805 strbuf_init(&path
, 20);
806 strbuf_addstr(&path
, file
);
808 result
= remove_dir_recursively(&path
, 1);
810 strbuf_release(&path
);
815 static int is_refname_available(const char *ref
, const char *oldref
,
816 struct ref_list
*list
, int quiet
)
818 int namlen
= strlen(ref
); /* e.g. 'foo/bar' */
820 /* list->name could be 'foo' or 'foo/bar/baz' */
821 if (!oldref
|| strcmp(oldref
, list
->name
)) {
822 int len
= strlen(list
->name
);
823 int cmplen
= (namlen
< len
) ? namlen
: len
;
824 const char *lead
= (namlen
< len
) ? list
->name
: ref
;
825 if (!strncmp(ref
, list
->name
, cmplen
) &&
826 lead
[cmplen
] == '/') {
828 error("'%s' exists; cannot create '%s'",
838 static struct ref_lock
*lock_ref_sha1_basic(const char *ref
, const unsigned char *old_sha1
, int flags
, int *type_p
)
841 const char *orig_ref
= ref
;
842 struct ref_lock
*lock
;
845 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
848 lock
= xcalloc(1, sizeof(struct ref_lock
));
851 ref
= resolve_ref(ref
, lock
->old_sha1
, mustexist
, &type
);
852 if (!ref
&& errno
== EISDIR
) {
853 /* we are trying to lock foo but we used to
854 * have foo/bar which now does not exist;
855 * it is normal for the empty directory 'foo'
858 ref_file
= git_path("%s", orig_ref
);
859 if (remove_empty_directories(ref_file
)) {
861 error("there are still refs under '%s'", orig_ref
);
864 ref
= resolve_ref(orig_ref
, lock
->old_sha1
, mustexist
, &type
);
870 error("unable to resolve reference %s: %s",
871 orig_ref
, strerror(errno
));
874 missing
= is_null_sha1(lock
->old_sha1
);
875 /* When the ref did not exist and we are creating it,
876 * make sure there is no existing ref that is packed
877 * whose name begins with our refname, nor a ref whose
878 * name is a proper prefix of our refname.
881 !is_refname_available(ref
, NULL
, get_packed_refs(), 0))
884 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
886 lflags
= LOCK_DIE_ON_ERROR
;
887 if (flags
& REF_NODEREF
) {
889 lflags
|= LOCK_NODEREF
;
891 lock
->ref_name
= xstrdup(ref
);
892 lock
->orig_ref_name
= xstrdup(orig_ref
);
893 ref_file
= git_path("%s", ref
);
895 lock
->force_write
= 1;
896 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
897 lock
->force_write
= 1;
899 if (safe_create_leading_directories(ref_file
)) {
901 error("unable to create directory for %s", ref_file
);
905 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
906 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
914 struct ref_lock
*lock_ref_sha1(const char *ref
, const unsigned char *old_sha1
)
916 char refpath
[PATH_MAX
];
917 if (check_ref_format(ref
))
919 strcpy(refpath
, mkpath("refs/%s", ref
));
920 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
923 struct ref_lock
*lock_any_ref_for_update(const char *ref
, const unsigned char *old_sha1
, int flags
)
925 switch (check_ref_format(ref
)) {
929 case CHECK_REF_FORMAT_ONELEVEL
:
930 return lock_ref_sha1_basic(ref
, old_sha1
, flags
, NULL
);
934 static struct lock_file packlock
;
936 static int repack_without_ref(const char *refname
)
938 struct ref_list
*list
, *packed_ref_list
;
942 packed_ref_list
= get_packed_refs();
943 for (list
= packed_ref_list
; list
; list
= list
->next
) {
944 if (!strcmp(refname
, list
->name
)) {
951 fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
953 return error("cannot delete '%s' from packed refs", refname
);
955 for (list
= packed_ref_list
; list
; list
= list
->next
) {
956 char line
[PATH_MAX
+ 100];
959 if (!strcmp(refname
, list
->name
))
961 len
= snprintf(line
, sizeof(line
), "%s %s\n",
962 sha1_to_hex(list
->sha1
), list
->name
);
963 /* this should not happen but just being defensive */
964 if (len
> sizeof(line
))
965 die("too long a refname '%s'", list
->name
);
966 write_or_die(fd
, line
, len
);
968 return commit_lock_file(&packlock
);
971 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
973 struct ref_lock
*lock
;
974 int err
, i
= 0, ret
= 0, flag
= 0;
976 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
979 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
983 if (!(delopt
& REF_NODEREF
)) {
984 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
985 lock
->lk
->filename
[i
] = 0;
986 path
= lock
->lk
->filename
;
988 path
= git_path("%s", refname
);
991 if (err
&& errno
!= ENOENT
) {
993 error("unlink(%s) failed: %s",
994 path
, strerror(errno
));
996 if (!(delopt
& REF_NODEREF
))
997 lock
->lk
->filename
[i
] = '.';
999 /* removing the loose one could have resurrected an earlier
1000 * packed one. Also, if it was not loose we need to repack
1003 ret
|= repack_without_ref(refname
);
1005 err
= unlink(git_path("logs/%s", lock
->ref_name
));
1006 if (err
&& errno
!= ENOENT
)
1007 fprintf(stderr
, "warning: unlink(%s) failed: %s",
1008 git_path("logs/%s", lock
->ref_name
), strerror(errno
));
1009 invalidate_cached_refs();
1014 int rename_ref(const char *oldref
, const char *newref
, const char *logmsg
)
1016 static const char renamed_ref
[] = "RENAMED-REF";
1017 unsigned char sha1
[20], orig_sha1
[20];
1018 int flag
= 0, logmoved
= 0;
1019 struct ref_lock
*lock
;
1020 struct stat loginfo
;
1021 int log
= !lstat(git_path("logs/%s", oldref
), &loginfo
);
1022 const char *symref
= NULL
;
1024 if (log
&& S_ISLNK(loginfo
.st_mode
))
1025 return error("reflog for %s is a symlink", oldref
);
1027 symref
= resolve_ref(oldref
, orig_sha1
, 1, &flag
);
1028 if (flag
& REF_ISSYMREF
)
1029 return error("refname %s is a symbolic ref, renaming it is not supported",
1032 return error("refname %s not found", oldref
);
1034 if (!is_refname_available(newref
, oldref
, get_packed_refs(), 0))
1037 if (!is_refname_available(newref
, oldref
, get_loose_refs(), 0))
1040 lock
= lock_ref_sha1_basic(renamed_ref
, NULL
, 0, NULL
);
1042 return error("unable to lock %s", renamed_ref
);
1043 lock
->force_write
= 1;
1044 if (write_ref_sha1(lock
, orig_sha1
, logmsg
))
1045 return error("unable to save current sha1 in %s", renamed_ref
);
1047 if (log
&& rename(git_path("logs/%s", oldref
), git_path("tmp-renamed-log")))
1048 return error("unable to move logfile logs/%s to tmp-renamed-log: %s",
1049 oldref
, strerror(errno
));
1051 if (delete_ref(oldref
, orig_sha1
, REF_NODEREF
)) {
1052 error("unable to delete old %s", oldref
);
1056 if (resolve_ref(newref
, sha1
, 1, &flag
) && delete_ref(newref
, sha1
, REF_NODEREF
)) {
1057 if (errno
==EISDIR
) {
1058 if (remove_empty_directories(git_path("%s", newref
))) {
1059 error("Directory not empty: %s", newref
);
1063 error("unable to delete existing %s", newref
);
1068 if (log
&& safe_create_leading_directories(git_path("logs/%s", newref
))) {
1069 error("unable to create directory for %s", newref
);
1074 if (log
&& rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref
))) {
1075 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1077 * rename(a, b) when b is an existing
1078 * directory ought to result in ISDIR, but
1079 * Solaris 5.8 gives ENOTDIR. Sheesh.
1081 if (remove_empty_directories(git_path("logs/%s", newref
))) {
1082 error("Directory not empty: logs/%s", newref
);
1087 error("unable to move logfile tmp-renamed-log to logs/%s: %s",
1088 newref
, strerror(errno
));
1094 lock
= lock_ref_sha1_basic(newref
, NULL
, 0, NULL
);
1096 error("unable to lock %s for update", newref
);
1099 lock
->force_write
= 1;
1100 hashcpy(lock
->old_sha1
, orig_sha1
);
1101 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1102 error("unable to write current sha1 into %s", newref
);
1109 lock
= lock_ref_sha1_basic(oldref
, NULL
, 0, NULL
);
1111 error("unable to lock %s for rollback", oldref
);
1115 lock
->force_write
= 1;
1116 flag
= log_all_ref_updates
;
1117 log_all_ref_updates
= 0;
1118 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1119 error("unable to write current sha1 into %s", oldref
);
1120 log_all_ref_updates
= flag
;
1123 if (logmoved
&& rename(git_path("logs/%s", newref
), git_path("logs/%s", oldref
)))
1124 error("unable to restore logfile %s from %s: %s",
1125 oldref
, newref
, strerror(errno
));
1126 if (!logmoved
&& log
&&
1127 rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref
)))
1128 error("unable to restore logfile %s from tmp-renamed-log: %s",
1129 oldref
, strerror(errno
));
1134 int close_ref(struct ref_lock
*lock
)
1136 if (close_lock_file(lock
->lk
))
1142 int commit_ref(struct ref_lock
*lock
)
1144 if (commit_lock_file(lock
->lk
))
1150 void unlock_ref(struct ref_lock
*lock
)
1152 /* Do not free lock->lk -- atexit() still looks at them */
1154 rollback_lock_file(lock
->lk
);
1155 free(lock
->ref_name
);
1156 free(lock
->orig_ref_name
);
1161 * copy the reflog message msg to buf, which has been allocated sufficiently
1162 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1163 * because reflog file is one line per entry.
1165 static int copy_msg(char *buf
, const char *msg
)
1172 while ((c
= *msg
++)) {
1173 if (wasspace
&& isspace(c
))
1175 wasspace
= isspace(c
);
1180 while (buf
< cp
&& isspace(cp
[-1]))
1186 static int log_ref_write(const char *ref_name
, const unsigned char *old_sha1
,
1187 const unsigned char *new_sha1
, const char *msg
)
1189 int logfd
, written
, oflags
= O_APPEND
| O_WRONLY
;
1190 unsigned maxlen
, len
;
1192 char log_file
[PATH_MAX
];
1194 const char *committer
;
1196 if (log_all_ref_updates
< 0)
1197 log_all_ref_updates
= !is_bare_repository();
1199 git_snpath(log_file
, sizeof(log_file
), "logs/%s", ref_name
);
1201 if (log_all_ref_updates
&&
1202 (!prefixcmp(ref_name
, "refs/heads/") ||
1203 !prefixcmp(ref_name
, "refs/remotes/") ||
1204 !strcmp(ref_name
, "HEAD"))) {
1205 if (safe_create_leading_directories(log_file
) < 0)
1206 return error("unable to create directory for %s",
1211 logfd
= open(log_file
, oflags
, 0666);
1213 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1216 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1217 if (remove_empty_directories(log_file
)) {
1218 return error("There are still logs under '%s'",
1221 logfd
= open(log_file
, oflags
, 0666);
1225 return error("Unable to append to %s: %s",
1226 log_file
, strerror(errno
));
1229 adjust_shared_perm(log_file
);
1231 msglen
= msg
? strlen(msg
) : 0;
1232 committer
= git_committer_info(0);
1233 maxlen
= strlen(committer
) + msglen
+ 100;
1234 logrec
= xmalloc(maxlen
);
1235 len
= sprintf(logrec
, "%s %s %s\n",
1236 sha1_to_hex(old_sha1
),
1237 sha1_to_hex(new_sha1
),
1240 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1241 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1243 if (close(logfd
) != 0 || written
!= len
)
1244 return error("Unable to append to %s", log_file
);
1248 static int is_branch(const char *refname
)
1250 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1253 int write_ref_sha1(struct ref_lock
*lock
,
1254 const unsigned char *sha1
, const char *logmsg
)
1256 static char term
= '\n';
1261 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1265 o
= parse_object(sha1
);
1267 error("Trying to write ref %s with nonexistant object %s",
1268 lock
->ref_name
, sha1_to_hex(sha1
));
1272 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1273 error("Trying to write non-commit object %s to branch %s",
1274 sha1_to_hex(sha1
), lock
->ref_name
);
1278 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1279 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1280 || close_ref(lock
) < 0) {
1281 error("Couldn't write %s", lock
->lk
->filename
);
1285 invalidate_cached_refs();
1286 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1287 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1288 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1292 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1294 * Special hack: If a branch is updated directly and HEAD
1295 * points to it (may happen on the remote side of a push
1296 * for example) then logically the HEAD reflog should be
1298 * A generic solution implies reverse symref information,
1299 * but finding all symrefs pointing to the given branch
1300 * would be rather costly for this rare event (the direct
1301 * update of a branch) to be worth it. So let's cheat and
1302 * check with HEAD only which should cover 99% of all usage
1303 * scenarios (even 100% of the default ones).
1305 unsigned char head_sha1
[20];
1307 const char *head_ref
;
1308 head_ref
= resolve_ref("HEAD", head_sha1
, 1, &head_flag
);
1309 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1310 !strcmp(head_ref
, lock
->ref_name
))
1311 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1313 if (commit_ref(lock
)) {
1314 error("Couldn't set %s", lock
->ref_name
);
1322 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1325 const char *lockpath
;
1327 int fd
, len
, written
;
1328 char *git_HEAD
= git_pathdup("%s", ref_target
);
1329 unsigned char old_sha1
[20], new_sha1
[20];
1331 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1334 if (safe_create_leading_directories(git_HEAD
) < 0)
1335 return error("unable to create directory for %s", git_HEAD
);
1337 #ifndef NO_SYMLINK_HEAD
1338 if (prefer_symlink_refs
) {
1340 if (!symlink(refs_heads_master
, git_HEAD
))
1342 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1346 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1347 if (sizeof(ref
) <= len
) {
1348 error("refname too long: %s", refs_heads_master
);
1349 goto error_free_return
;
1351 lockpath
= mkpath("%s.lock", git_HEAD
);
1352 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1354 error("Unable to open %s for writing", lockpath
);
1355 goto error_free_return
;
1357 written
= write_in_full(fd
, ref
, len
);
1358 if (close(fd
) != 0 || written
!= len
) {
1359 error("Unable to write to %s", lockpath
);
1360 goto error_unlink_return
;
1362 if (rename(lockpath
, git_HEAD
) < 0) {
1363 error("Unable to create %s", git_HEAD
);
1364 goto error_unlink_return
;
1366 if (adjust_shared_perm(git_HEAD
)) {
1367 error("Unable to fix permissions on %s", lockpath
);
1368 error_unlink_return
:
1375 #ifndef NO_SYMLINK_HEAD
1378 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1379 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1385 static char *ref_msg(const char *line
, const char *endp
)
1389 ep
= memchr(line
, '\n', endp
- line
);
1392 return xmemdupz(line
, ep
- line
);
1395 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
)
1397 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1399 int logfd
, tz
, reccnt
= 0;
1402 unsigned char logged_sha1
[20];
1406 logfile
= git_path("logs/%s", ref
);
1407 logfd
= open(logfile
, O_RDONLY
, 0);
1409 die("Unable to read log %s: %s", logfile
, strerror(errno
));
1412 die("Log %s is empty.", logfile
);
1413 mapsz
= xsize_t(st
.st_size
);
1414 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1415 logdata
= log_mapped
;
1419 rec
= logend
= logdata
+ st
.st_size
;
1420 while (logdata
< rec
) {
1422 if (logdata
< rec
&& *(rec
-1) == '\n')
1425 while (logdata
< rec
&& *(rec
-1) != '\n') {
1431 die("Log %s is corrupt.", logfile
);
1432 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1433 if (date
<= at_time
|| cnt
== 0) {
1434 tz
= strtoul(tz_c
, NULL
, 10);
1436 *msg
= ref_msg(rec
, logend
);
1438 *cutoff_time
= date
;
1442 *cutoff_cnt
= reccnt
- 1;
1444 if (get_sha1_hex(lastrec
, logged_sha1
))
1445 die("Log %s is corrupt.", logfile
);
1446 if (get_sha1_hex(rec
+ 41, sha1
))
1447 die("Log %s is corrupt.", logfile
);
1448 if (hashcmp(logged_sha1
, sha1
)) {
1450 "warning: Log %s has gap after %s.\n",
1451 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1454 else if (date
== at_time
) {
1455 if (get_sha1_hex(rec
+ 41, sha1
))
1456 die("Log %s is corrupt.", logfile
);
1459 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1460 die("Log %s is corrupt.", logfile
);
1461 if (hashcmp(logged_sha1
, sha1
)) {
1463 "warning: Log %s unexpectedly ended on %s.\n",
1464 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1467 munmap(log_mapped
, mapsz
);
1476 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1478 if (rec
== logend
|| *rec
== '\n')
1479 die("Log %s is corrupt.", logfile
);
1480 date
= strtoul(rec
+ 1, &tz_c
, 10);
1481 tz
= strtoul(tz_c
, NULL
, 10);
1482 if (get_sha1_hex(logdata
, sha1
))
1483 die("Log %s is corrupt.", logfile
);
1484 if (is_null_sha1(sha1
)) {
1485 if (get_sha1_hex(logdata
+ 41, sha1
))
1486 die("Log %s is corrupt.", logfile
);
1489 *msg
= ref_msg(logdata
, logend
);
1490 munmap(log_mapped
, mapsz
);
1493 *cutoff_time
= date
;
1497 *cutoff_cnt
= reccnt
;
1501 int for_each_recent_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1503 const char *logfile
;
1508 logfile
= git_path("logs/%s", ref
);
1509 logfp
= fopen(logfile
, "r");
1514 struct stat statbuf
;
1515 if (fstat(fileno(logfp
), &statbuf
) ||
1516 statbuf
.st_size
< ofs
||
1517 fseek(logfp
, -ofs
, SEEK_END
) ||
1518 fgets(buf
, sizeof(buf
), logfp
))
1522 while (fgets(buf
, sizeof(buf
), logfp
)) {
1523 unsigned char osha1
[20], nsha1
[20];
1524 char *email_end
, *message
;
1525 unsigned long timestamp
;
1528 /* old SP new SP name <email> SP time TAB msg LF */
1530 if (len
< 83 || buf
[len
-1] != '\n' ||
1531 get_sha1_hex(buf
, osha1
) || buf
[40] != ' ' ||
1532 get_sha1_hex(buf
+ 41, nsha1
) || buf
[81] != ' ' ||
1533 !(email_end
= strchr(buf
+ 82, '>')) ||
1534 email_end
[1] != ' ' ||
1535 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1536 !message
|| message
[0] != ' ' ||
1537 (message
[1] != '+' && message
[1] != '-') ||
1538 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1539 !isdigit(message
[4]) || !isdigit(message
[5]))
1540 continue; /* corrupt? */
1541 email_end
[1] = '\0';
1542 tz
= strtol(message
+ 1, NULL
, 10);
1543 if (message
[6] != '\t')
1547 ret
= fn(osha1
, nsha1
, buf
+82, timestamp
, tz
, message
, cb_data
);
1555 int for_each_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, void *cb_data
)
1557 return for_each_recent_reflog_ent(ref
, fn
, 0, cb_data
);
1560 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
1562 DIR *dir
= opendir(git_path("logs/%s", base
));
1567 int baselen
= strlen(base
);
1568 char *log
= xmalloc(baselen
+ 257);
1570 memcpy(log
, base
, baselen
);
1571 if (baselen
&& base
[baselen
-1] != '/')
1572 log
[baselen
++] = '/';
1574 while ((de
= readdir(dir
)) != NULL
) {
1578 if (de
->d_name
[0] == '.')
1580 namelen
= strlen(de
->d_name
);
1583 if (has_extension(de
->d_name
, ".lock"))
1585 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
1586 if (stat(git_path("logs/%s", log
), &st
) < 0)
1588 if (S_ISDIR(st
.st_mode
)) {
1589 retval
= do_for_each_reflog(log
, fn
, cb_data
);
1591 unsigned char sha1
[20];
1592 if (!resolve_ref(log
, sha1
, 0, NULL
))
1593 retval
= error("bad ref for %s", log
);
1595 retval
= fn(log
, sha1
, 0, cb_data
);
1608 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
1610 return do_for_each_reflog("", fn
, cb_data
);
1613 int update_ref(const char *action
, const char *refname
,
1614 const unsigned char *sha1
, const unsigned char *oldval
,
1615 int flags
, enum action_on_err onerr
)
1617 static struct ref_lock
*lock
;
1618 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
1620 const char *str
= "Cannot lock the ref '%s'.";
1622 case MSG_ON_ERR
: error(str
, refname
); break;
1623 case DIE_ON_ERR
: die(str
, refname
); break;
1624 case QUIET_ON_ERR
: break;
1628 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
1629 const char *str
= "Cannot update the ref '%s'.";
1631 case MSG_ON_ERR
: error(str
, refname
); break;
1632 case DIE_ON_ERR
: die(str
, refname
); break;
1633 case QUIET_ON_ERR
: break;
1640 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
1642 for ( ; list
; list
= list
->next
)
1643 if (!strcmp(list
->name
, name
))
1644 return (struct ref
*)list
;