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
)) {
279 error("%s points nowhere!", ref
);
282 list
= add_ref(ref
, sha1
, flag
, list
, NULL
);
287 return sort_ref_list(list
);
290 static struct ref_list
*get_loose_refs(void)
292 if (!cached_refs
.did_loose
) {
293 cached_refs
.loose
= get_ref_dir("refs", NULL
);
294 cached_refs
.did_loose
= 1;
296 return cached_refs
.loose
;
299 /* We allow "recursive" symbolic refs. Only within reason, though */
301 #define MAXREFLEN (1024)
303 static int resolve_gitlink_packed_ref(char *name
, int pathlen
, const char *refname
, unsigned char *result
)
306 struct cached_refs refs
;
307 struct ref_list
*ref
;
310 strcpy(name
+ pathlen
, "packed-refs");
311 f
= fopen(name
, "r");
314 read_packed_refs(f
, &refs
);
319 if (!strcmp(ref
->name
, refname
)) {
321 memcpy(result
, ref
->sha1
, 20);
326 free_ref_list(refs
.packed
);
330 static int resolve_gitlink_ref_recursive(char *name
, int pathlen
, const char *refname
, unsigned char *result
, int recursion
)
332 int fd
, len
= strlen(refname
);
333 char buffer
[128], *p
;
335 if (recursion
> MAXDEPTH
|| len
> MAXREFLEN
)
337 memcpy(name
+ pathlen
, refname
, len
+1);
338 fd
= open(name
, O_RDONLY
);
340 return resolve_gitlink_packed_ref(name
, pathlen
, refname
, result
);
342 len
= read(fd
, buffer
, sizeof(buffer
)-1);
346 while (len
&& isspace(buffer
[len
-1]))
350 /* Was it a detached head or an old-fashioned symlink? */
351 if (!get_sha1_hex(buffer
, result
))
355 if (strncmp(buffer
, "ref:", 4))
361 return resolve_gitlink_ref_recursive(name
, pathlen
, p
, result
, recursion
+1);
364 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *result
)
366 int len
= strlen(path
), retval
;
370 while (len
&& path
[len
-1] == '/')
374 gitdir
= xmalloc(len
+ MAXREFLEN
+ 8);
375 memcpy(gitdir
, path
, len
);
376 memcpy(gitdir
+ len
, "/.git", 6);
379 tmp
= read_gitfile_gently(gitdir
);
383 gitdir
= xmalloc(len
+ MAXREFLEN
+ 3);
384 memcpy(gitdir
, tmp
, len
);
387 gitdir
[++len
] = '\0';
388 retval
= resolve_gitlink_ref_recursive(gitdir
, len
, refname
, result
, 0);
393 const char *resolve_ref(const char *ref
, unsigned char *sha1
, int reading
, int *flag
)
395 int depth
= MAXDEPTH
;
398 static char ref_buffer
[256];
404 const char *path
= git_path("%s", ref
);
412 /* Special case: non-existing file.
413 * Not having the refs/heads/new-branch is OK
414 * if we are writing into it, so is .git/HEAD
415 * that points at refs/heads/master still to be
416 * born. It is NOT OK if we are resolving for
419 if (lstat(path
, &st
) < 0) {
420 struct ref_list
*list
= get_packed_refs();
422 if (!strcmp(ref
, list
->name
)) {
423 hashcpy(sha1
, list
->sha1
);
425 *flag
|= REF_ISPACKED
;
430 if (reading
|| errno
!= ENOENT
)
436 /* Follow "normalized" - ie "refs/.." symlinks by hand */
437 if (S_ISLNK(st
.st_mode
)) {
438 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
439 if (len
>= 5 && !memcmp("refs/", buffer
, 5)) {
441 strcpy(ref_buffer
, buffer
);
444 *flag
|= REF_ISSYMREF
;
449 /* Is it a directory? */
450 if (S_ISDIR(st
.st_mode
)) {
456 * Anything else, just open it and try to use it as
459 fd
= open(path
, O_RDONLY
);
462 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
466 * Is it a symbolic ref?
468 if (len
< 4 || memcmp("ref:", buffer
, 4))
472 while (len
&& isspace(*buf
))
474 while (len
&& isspace(buf
[len
-1]))
477 memcpy(ref_buffer
, buf
, len
+ 1);
480 *flag
|= REF_ISSYMREF
;
482 if (len
< 40 || get_sha1_hex(buffer
, sha1
))
487 int read_ref(const char *ref
, unsigned char *sha1
)
489 if (resolve_ref(ref
, sha1
, 1, NULL
))
494 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
495 void *cb_data
, struct ref_list
*entry
)
497 if (strncmp(base
, entry
->name
, trim
))
499 if (is_null_sha1(entry
->sha1
))
501 if (!has_sha1_file(entry
->sha1
)) {
502 error("%s does not point to a valid object!", entry
->name
);
506 return fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
509 int peel_ref(const char *ref
, unsigned char *sha1
)
512 unsigned char base
[20];
515 if (current_ref
&& (current_ref
->name
== ref
516 || !strcmp(current_ref
->name
, ref
))) {
517 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
518 hashcpy(sha1
, current_ref
->peeled
);
521 hashcpy(base
, current_ref
->sha1
);
525 if (!resolve_ref(ref
, base
, 1, &flag
))
528 if ((flag
& REF_ISPACKED
)) {
529 struct ref_list
*list
= get_packed_refs();
532 if (!strcmp(list
->name
, ref
)) {
533 if (list
->flag
& REF_KNOWS_PEELED
) {
534 hashcpy(sha1
, list
->peeled
);
537 /* older pack-refs did not leave peeled ones */
545 o
= parse_object(base
);
546 if (o
&& o
->type
== OBJ_TAG
) {
547 o
= deref_tag(o
, ref
, 0);
549 hashcpy(sha1
, o
->sha1
);
556 static int do_for_each_ref(const char *base
, each_ref_fn fn
, int trim
,
560 struct ref_list
*packed
= get_packed_refs();
561 struct ref_list
*loose
= get_loose_refs();
563 struct ref_list
*extra
;
565 for (extra
= extra_refs
; extra
; extra
= extra
->next
)
566 retval
= do_one_ref(base
, fn
, trim
, cb_data
, extra
);
568 while (packed
&& loose
) {
569 struct ref_list
*entry
;
570 int cmp
= strcmp(packed
->name
, loose
->name
);
572 packed
= packed
->next
;
580 packed
= packed
->next
;
582 retval
= do_one_ref(base
, fn
, trim
, cb_data
, entry
);
587 for (packed
= packed
? packed
: loose
; packed
; packed
= packed
->next
) {
588 retval
= do_one_ref(base
, fn
, trim
, cb_data
, packed
);
598 int head_ref(each_ref_fn fn
, void *cb_data
)
600 unsigned char sha1
[20];
603 if (resolve_ref("HEAD", sha1
, 1, &flag
))
604 return fn("HEAD", sha1
, flag
, cb_data
);
608 int for_each_ref(each_ref_fn fn
, void *cb_data
)
610 return do_for_each_ref("refs/", fn
, 0, cb_data
);
613 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
615 return do_for_each_ref("refs/tags/", fn
, 10, cb_data
);
618 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
620 return do_for_each_ref("refs/heads/", fn
, 11, cb_data
);
623 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
625 return do_for_each_ref("refs/remotes/", fn
, 13, cb_data
);
629 * Make sure "ref" is something reasonable to have under ".git/refs/";
630 * We do not like it if:
632 * - any path component of it begins with ".", or
633 * - it has double dots "..", or
634 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
635 * - it ends with a "/".
638 static inline int bad_ref_char(int ch
)
640 if (((unsigned) ch
) <= ' ' ||
641 ch
== '~' || ch
== '^' || ch
== ':')
643 /* 2.13 Pattern Matching Notation */
644 if (ch
== '?' || ch
== '[') /* Unsupported */
646 if (ch
== '*') /* Supported at the end */
651 int check_ref_format(const char *ref
)
653 int ch
, level
, bad_type
;
654 const char *cp
= ref
;
658 while ((ch
= *cp
++) == '/')
659 ; /* tolerate duplicated slashes */
661 /* should not end with slashes */
662 return CHECK_REF_FORMAT_ERROR
;
664 /* we are at the beginning of the path component */
666 return CHECK_REF_FORMAT_ERROR
;
667 bad_type
= bad_ref_char(ch
);
669 return (bad_type
== 2 && !*cp
)
670 ? CHECK_REF_FORMAT_WILDCARD
671 : CHECK_REF_FORMAT_ERROR
;
674 /* scan the rest of the path component */
675 while ((ch
= *cp
++) != 0) {
676 bad_type
= bad_ref_char(ch
);
678 return (bad_type
== 2 && !*cp
)
679 ? CHECK_REF_FORMAT_WILDCARD
680 : CHECK_REF_FORMAT_ERROR
;
684 if (ch
== '.' && *cp
== '.')
685 return CHECK_REF_FORMAT_ERROR
;
690 return CHECK_REF_FORMAT_ONELEVEL
;
691 return CHECK_REF_FORMAT_OK
;
696 const char *ref_rev_parse_rules
[] = {
702 "refs/remotes/%.*s/HEAD",
706 const char *ref_fetch_rules
[] = {
713 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
716 const int abbrev_name_len
= strlen(abbrev_name
);
718 for (p
= rules
; *p
; p
++) {
719 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
727 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
728 const unsigned char *old_sha1
, int mustexist
)
730 if (!resolve_ref(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
731 error("Can't verify ref %s", lock
->ref_name
);
735 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
736 error("Ref %s is at %s but expected %s", lock
->ref_name
,
737 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
744 static int remove_empty_directories(const char *file
)
746 /* we want to create a file but there is a directory there;
747 * if that is an empty directory (or a directory that contains
748 * only empty directories), remove them.
753 strbuf_init(&path
, 20);
754 strbuf_addstr(&path
, file
);
756 result
= remove_dir_recursively(&path
, 1);
758 strbuf_release(&path
);
763 static int is_refname_available(const char *ref
, const char *oldref
,
764 struct ref_list
*list
, int quiet
)
766 int namlen
= strlen(ref
); /* e.g. 'foo/bar' */
768 /* list->name could be 'foo' or 'foo/bar/baz' */
769 if (!oldref
|| strcmp(oldref
, list
->name
)) {
770 int len
= strlen(list
->name
);
771 int cmplen
= (namlen
< len
) ? namlen
: len
;
772 const char *lead
= (namlen
< len
) ? list
->name
: ref
;
773 if (!strncmp(ref
, list
->name
, cmplen
) &&
774 lead
[cmplen
] == '/') {
776 error("'%s' exists; cannot create '%s'",
786 static struct ref_lock
*lock_ref_sha1_basic(const char *ref
, const unsigned char *old_sha1
, int flags
, int *type_p
)
789 const char *orig_ref
= ref
;
790 struct ref_lock
*lock
;
794 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
796 lock
= xcalloc(1, sizeof(struct ref_lock
));
799 ref
= resolve_ref(ref
, lock
->old_sha1
, mustexist
, &type
);
800 if (!ref
&& errno
== EISDIR
) {
801 /* we are trying to lock foo but we used to
802 * have foo/bar which now does not exist;
803 * it is normal for the empty directory 'foo'
806 ref_file
= git_path("%s", orig_ref
);
807 if (remove_empty_directories(ref_file
)) {
809 error("there are still refs under '%s'", orig_ref
);
812 ref
= resolve_ref(orig_ref
, lock
->old_sha1
, mustexist
, &type
);
818 error("unable to resolve reference %s: %s",
819 orig_ref
, strerror(errno
));
822 /* When the ref did not exist and we are creating it,
823 * make sure there is no existing ref that is packed
824 * whose name begins with our refname, nor a ref whose
825 * name is a proper prefix of our refname.
827 if (is_null_sha1(lock
->old_sha1
) &&
828 !is_refname_available(ref
, NULL
, get_packed_refs(), 0))
831 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
833 if (flags
& REF_NODEREF
)
835 lock
->ref_name
= xstrdup(ref
);
836 lock
->orig_ref_name
= xstrdup(orig_ref
);
837 ref_file
= git_path("%s", ref
);
838 if (lstat(ref_file
, &st
) && errno
== ENOENT
)
839 lock
->force_write
= 1;
840 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
841 lock
->force_write
= 1;
843 if (safe_create_leading_directories(ref_file
)) {
845 error("unable to create directory for %s", ref_file
);
848 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, 1);
850 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
858 struct ref_lock
*lock_ref_sha1(const char *ref
, const unsigned char *old_sha1
)
860 char refpath
[PATH_MAX
];
861 if (check_ref_format(ref
))
863 strcpy(refpath
, mkpath("refs/%s", ref
));
864 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
867 struct ref_lock
*lock_any_ref_for_update(const char *ref
, const unsigned char *old_sha1
, int flags
)
869 switch (check_ref_format(ref
)) {
873 case CHECK_REF_FORMAT_ONELEVEL
:
874 return lock_ref_sha1_basic(ref
, old_sha1
, flags
, NULL
);
878 static struct lock_file packlock
;
880 static int repack_without_ref(const char *refname
)
882 struct ref_list
*list
, *packed_ref_list
;
886 packed_ref_list
= get_packed_refs();
887 for (list
= packed_ref_list
; list
; list
= list
->next
) {
888 if (!strcmp(refname
, list
->name
)) {
895 fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
897 return error("cannot delete '%s' from packed refs", refname
);
899 for (list
= packed_ref_list
; list
; list
= list
->next
) {
900 char line
[PATH_MAX
+ 100];
903 if (!strcmp(refname
, list
->name
))
905 len
= snprintf(line
, sizeof(line
), "%s %s\n",
906 sha1_to_hex(list
->sha1
), list
->name
);
907 /* this should not happen but just being defensive */
908 if (len
> sizeof(line
))
909 die("too long a refname '%s'", list
->name
);
910 write_or_die(fd
, line
, len
);
912 return commit_lock_file(&packlock
);
915 int delete_ref(const char *refname
, const unsigned char *sha1
)
917 struct ref_lock
*lock
;
918 int err
, i
, ret
= 0, flag
= 0;
920 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
923 if (!(flag
& REF_ISPACKED
)) {
925 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
926 lock
->lk
->filename
[i
] = 0;
927 err
= unlink(lock
->lk
->filename
);
930 error("unlink(%s) failed: %s",
931 lock
->lk
->filename
, strerror(errno
));
933 lock
->lk
->filename
[i
] = '.';
935 /* removing the loose one could have resurrected an earlier
936 * packed one. Also, if it was not loose we need to repack
939 ret
|= repack_without_ref(refname
);
941 err
= unlink(git_path("logs/%s", lock
->ref_name
));
942 if (err
&& errno
!= ENOENT
)
943 fprintf(stderr
, "warning: unlink(%s) failed: %s",
944 git_path("logs/%s", lock
->ref_name
), strerror(errno
));
945 invalidate_cached_refs();
950 int rename_ref(const char *oldref
, const char *newref
, const char *logmsg
)
952 static const char renamed_ref
[] = "RENAMED-REF";
953 unsigned char sha1
[20], orig_sha1
[20];
954 int flag
= 0, logmoved
= 0;
955 struct ref_lock
*lock
;
957 int log
= !lstat(git_path("logs/%s", oldref
), &loginfo
);
959 if (S_ISLNK(loginfo
.st_mode
))
960 return error("reflog for %s is a symlink", oldref
);
962 if (!resolve_ref(oldref
, orig_sha1
, 1, &flag
))
963 return error("refname %s not found", oldref
);
965 if (!is_refname_available(newref
, oldref
, get_packed_refs(), 0))
968 if (!is_refname_available(newref
, oldref
, get_loose_refs(), 0))
971 lock
= lock_ref_sha1_basic(renamed_ref
, NULL
, 0, NULL
);
973 return error("unable to lock %s", renamed_ref
);
974 lock
->force_write
= 1;
975 if (write_ref_sha1(lock
, orig_sha1
, logmsg
))
976 return error("unable to save current sha1 in %s", renamed_ref
);
978 if (log
&& rename(git_path("logs/%s", oldref
), git_path("tmp-renamed-log")))
979 return error("unable to move logfile logs/%s to tmp-renamed-log: %s",
980 oldref
, strerror(errno
));
982 if (delete_ref(oldref
, orig_sha1
)) {
983 error("unable to delete old %s", oldref
);
987 if (resolve_ref(newref
, sha1
, 1, &flag
) && delete_ref(newref
, sha1
)) {
989 if (remove_empty_directories(git_path("%s", newref
))) {
990 error("Directory not empty: %s", newref
);
994 error("unable to delete existing %s", newref
);
999 if (log
&& safe_create_leading_directories(git_path("logs/%s", newref
))) {
1000 error("unable to create directory for %s", newref
);
1005 if (log
&& rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref
))) {
1006 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1008 * rename(a, b) when b is an existing
1009 * directory ought to result in ISDIR, but
1010 * Solaris 5.8 gives ENOTDIR. Sheesh.
1012 if (remove_empty_directories(git_path("logs/%s", newref
))) {
1013 error("Directory not empty: logs/%s", newref
);
1018 error("unable to move logfile tmp-renamed-log to logs/%s: %s",
1019 newref
, strerror(errno
));
1025 lock
= lock_ref_sha1_basic(newref
, NULL
, 0, NULL
);
1027 error("unable to lock %s for update", newref
);
1031 lock
->force_write
= 1;
1032 hashcpy(lock
->old_sha1
, orig_sha1
);
1033 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1034 error("unable to write current sha1 into %s", newref
);
1041 lock
= lock_ref_sha1_basic(oldref
, NULL
, 0, NULL
);
1043 error("unable to lock %s for rollback", oldref
);
1047 lock
->force_write
= 1;
1048 flag
= log_all_ref_updates
;
1049 log_all_ref_updates
= 0;
1050 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1051 error("unable to write current sha1 into %s", oldref
);
1052 log_all_ref_updates
= flag
;
1055 if (logmoved
&& rename(git_path("logs/%s", newref
), git_path("logs/%s", oldref
)))
1056 error("unable to restore logfile %s from %s: %s",
1057 oldref
, newref
, strerror(errno
));
1058 if (!logmoved
&& log
&&
1059 rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref
)))
1060 error("unable to restore logfile %s from tmp-renamed-log: %s",
1061 oldref
, strerror(errno
));
1066 int close_ref(struct ref_lock
*lock
)
1068 if (close_lock_file(lock
->lk
))
1074 int commit_ref(struct ref_lock
*lock
)
1076 if (commit_lock_file(lock
->lk
))
1082 void unlock_ref(struct ref_lock
*lock
)
1084 /* Do not free lock->lk -- atexit() still looks at them */
1086 rollback_lock_file(lock
->lk
);
1087 free(lock
->ref_name
);
1088 free(lock
->orig_ref_name
);
1093 * copy the reflog message msg to buf, which has been allocated sufficiently
1094 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1095 * because reflog file is one line per entry.
1097 static int copy_msg(char *buf
, const char *msg
)
1104 while ((c
= *msg
++)) {
1105 if (wasspace
&& isspace(c
))
1107 wasspace
= isspace(c
);
1112 while (buf
< cp
&& isspace(cp
[-1]))
1118 static int log_ref_write(const char *ref_name
, const unsigned char *old_sha1
,
1119 const unsigned char *new_sha1
, const char *msg
)
1121 int logfd
, written
, oflags
= O_APPEND
| O_WRONLY
;
1122 unsigned maxlen
, len
;
1124 char *log_file
, *logrec
;
1125 const char *committer
;
1127 if (log_all_ref_updates
< 0)
1128 log_all_ref_updates
= !is_bare_repository();
1130 log_file
= git_path("logs/%s", ref_name
);
1132 if (log_all_ref_updates
&&
1133 (!prefixcmp(ref_name
, "refs/heads/") ||
1134 !prefixcmp(ref_name
, "refs/remotes/") ||
1135 !strcmp(ref_name
, "HEAD"))) {
1136 if (safe_create_leading_directories(log_file
) < 0)
1137 return error("unable to create directory for %s",
1142 logfd
= open(log_file
, oflags
, 0666);
1144 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1147 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1148 if (remove_empty_directories(log_file
)) {
1149 return error("There are still logs under '%s'",
1152 logfd
= open(log_file
, oflags
, 0666);
1156 return error("Unable to append to %s: %s",
1157 log_file
, strerror(errno
));
1160 adjust_shared_perm(log_file
);
1162 msglen
= msg
? strlen(msg
) : 0;
1163 committer
= git_committer_info(0);
1164 maxlen
= strlen(committer
) + msglen
+ 100;
1165 logrec
= xmalloc(maxlen
);
1166 len
= sprintf(logrec
, "%s %s %s\n",
1167 sha1_to_hex(old_sha1
),
1168 sha1_to_hex(new_sha1
),
1171 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1172 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1174 if (close(logfd
) != 0 || written
!= len
)
1175 return error("Unable to append to %s", log_file
);
1179 static int is_branch(const char *refname
)
1181 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1184 int write_ref_sha1(struct ref_lock
*lock
,
1185 const unsigned char *sha1
, const char *logmsg
)
1187 static char term
= '\n';
1192 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1196 o
= parse_object(sha1
);
1198 error("Trying to write ref %s with nonexistant object %s",
1199 lock
->ref_name
, sha1_to_hex(sha1
));
1203 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1204 error("Trying to write non-commit object %s to branch %s",
1205 sha1_to_hex(sha1
), lock
->ref_name
);
1209 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1210 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1211 || close_ref(lock
) < 0) {
1212 error("Couldn't write %s", lock
->lk
->filename
);
1216 invalidate_cached_refs();
1217 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1218 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1219 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1223 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1225 * Special hack: If a branch is updated directly and HEAD
1226 * points to it (may happen on the remote side of a push
1227 * for example) then logically the HEAD reflog should be
1229 * A generic solution implies reverse symref information,
1230 * but finding all symrefs pointing to the given branch
1231 * would be rather costly for this rare event (the direct
1232 * update of a branch) to be worth it. So let's cheat and
1233 * check with HEAD only which should cover 99% of all usage
1234 * scenarios (even 100% of the default ones).
1236 unsigned char head_sha1
[20];
1238 const char *head_ref
;
1239 head_ref
= resolve_ref("HEAD", head_sha1
, 1, &head_flag
);
1240 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1241 !strcmp(head_ref
, lock
->ref_name
))
1242 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1244 if (commit_ref(lock
)) {
1245 error("Couldn't set %s", lock
->ref_name
);
1253 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1256 const char *lockpath
;
1258 int fd
, len
, written
;
1259 char *git_HEAD
= xstrdup(git_path("%s", ref_target
));
1260 unsigned char old_sha1
[20], new_sha1
[20];
1262 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1265 if (safe_create_leading_directories(git_HEAD
) < 0)
1266 return error("unable to create directory for %s", git_HEAD
);
1268 #ifndef NO_SYMLINK_HEAD
1269 if (prefer_symlink_refs
) {
1271 if (!symlink(refs_heads_master
, git_HEAD
))
1273 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1277 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1278 if (sizeof(ref
) <= len
) {
1279 error("refname too long: %s", refs_heads_master
);
1280 goto error_free_return
;
1282 lockpath
= mkpath("%s.lock", git_HEAD
);
1283 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1285 error("Unable to open %s for writing", lockpath
);
1286 goto error_free_return
;
1288 written
= write_in_full(fd
, ref
, len
);
1289 if (close(fd
) != 0 || written
!= len
) {
1290 error("Unable to write to %s", lockpath
);
1291 goto error_unlink_return
;
1293 if (rename(lockpath
, git_HEAD
) < 0) {
1294 error("Unable to create %s", git_HEAD
);
1295 goto error_unlink_return
;
1297 if (adjust_shared_perm(git_HEAD
)) {
1298 error("Unable to fix permissions on %s", lockpath
);
1299 error_unlink_return
:
1306 #ifndef NO_SYMLINK_HEAD
1309 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1310 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1316 static char *ref_msg(const char *line
, const char *endp
)
1320 ep
= memchr(line
, '\n', endp
- line
);
1323 return xmemdupz(line
, ep
- line
);
1326 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
)
1328 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1330 int logfd
, tz
, reccnt
= 0;
1333 unsigned char logged_sha1
[20];
1337 logfile
= git_path("logs/%s", ref
);
1338 logfd
= open(logfile
, O_RDONLY
, 0);
1340 die("Unable to read log %s: %s", logfile
, strerror(errno
));
1343 die("Log %s is empty.", logfile
);
1344 mapsz
= xsize_t(st
.st_size
);
1345 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1346 logdata
= log_mapped
;
1350 rec
= logend
= logdata
+ st
.st_size
;
1351 while (logdata
< rec
) {
1353 if (logdata
< rec
&& *(rec
-1) == '\n')
1356 while (logdata
< rec
&& *(rec
-1) != '\n') {
1362 die("Log %s is corrupt.", logfile
);
1363 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1364 if (date
<= at_time
|| cnt
== 0) {
1365 tz
= strtoul(tz_c
, NULL
, 10);
1367 *msg
= ref_msg(rec
, logend
);
1369 *cutoff_time
= date
;
1373 *cutoff_cnt
= reccnt
- 1;
1375 if (get_sha1_hex(lastrec
, logged_sha1
))
1376 die("Log %s is corrupt.", logfile
);
1377 if (get_sha1_hex(rec
+ 41, sha1
))
1378 die("Log %s is corrupt.", logfile
);
1379 if (hashcmp(logged_sha1
, sha1
)) {
1381 "warning: Log %s has gap after %s.\n",
1382 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1385 else if (date
== at_time
) {
1386 if (get_sha1_hex(rec
+ 41, sha1
))
1387 die("Log %s is corrupt.", logfile
);
1390 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1391 die("Log %s is corrupt.", logfile
);
1392 if (hashcmp(logged_sha1
, sha1
)) {
1394 "warning: Log %s unexpectedly ended on %s.\n",
1395 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1398 munmap(log_mapped
, mapsz
);
1407 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1409 if (rec
== logend
|| *rec
== '\n')
1410 die("Log %s is corrupt.", logfile
);
1411 date
= strtoul(rec
+ 1, &tz_c
, 10);
1412 tz
= strtoul(tz_c
, NULL
, 10);
1413 if (get_sha1_hex(logdata
, sha1
))
1414 die("Log %s is corrupt.", logfile
);
1416 *msg
= ref_msg(logdata
, logend
);
1417 munmap(log_mapped
, mapsz
);
1420 *cutoff_time
= date
;
1424 *cutoff_cnt
= reccnt
;
1428 int for_each_reflog_ent(const char *ref
, each_reflog_ent_fn fn
, void *cb_data
)
1430 const char *logfile
;
1435 logfile
= git_path("logs/%s", ref
);
1436 logfp
= fopen(logfile
, "r");
1439 while (fgets(buf
, sizeof(buf
), logfp
)) {
1440 unsigned char osha1
[20], nsha1
[20];
1441 char *email_end
, *message
;
1442 unsigned long timestamp
;
1445 /* old SP new SP name <email> SP time TAB msg LF */
1447 if (len
< 83 || buf
[len
-1] != '\n' ||
1448 get_sha1_hex(buf
, osha1
) || buf
[40] != ' ' ||
1449 get_sha1_hex(buf
+ 41, nsha1
) || buf
[81] != ' ' ||
1450 !(email_end
= strchr(buf
+ 82, '>')) ||
1451 email_end
[1] != ' ' ||
1452 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1453 !message
|| message
[0] != ' ' ||
1454 (message
[1] != '+' && message
[1] != '-') ||
1455 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1456 !isdigit(message
[4]) || !isdigit(message
[5]))
1457 continue; /* corrupt? */
1458 email_end
[1] = '\0';
1459 tz
= strtol(message
+ 1, NULL
, 10);
1460 if (message
[6] != '\t')
1464 ret
= fn(osha1
, nsha1
, buf
+82, timestamp
, tz
, message
, cb_data
);
1472 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
1474 DIR *dir
= opendir(git_path("logs/%s", base
));
1479 int baselen
= strlen(base
);
1480 char *log
= xmalloc(baselen
+ 257);
1482 memcpy(log
, base
, baselen
);
1483 if (baselen
&& base
[baselen
-1] != '/')
1484 log
[baselen
++] = '/';
1486 while ((de
= readdir(dir
)) != NULL
) {
1490 if (de
->d_name
[0] == '.')
1492 namelen
= strlen(de
->d_name
);
1495 if (has_extension(de
->d_name
, ".lock"))
1497 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
1498 if (stat(git_path("logs/%s", log
), &st
) < 0)
1500 if (S_ISDIR(st
.st_mode
)) {
1501 retval
= do_for_each_reflog(log
, fn
, cb_data
);
1503 unsigned char sha1
[20];
1504 if (!resolve_ref(log
, sha1
, 0, NULL
))
1505 retval
= error("bad ref for %s", log
);
1507 retval
= fn(log
, sha1
, 0, cb_data
);
1520 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
1522 return do_for_each_reflog("", fn
, cb_data
);
1525 int update_ref(const char *action
, const char *refname
,
1526 const unsigned char *sha1
, const unsigned char *oldval
,
1527 int flags
, enum action_on_err onerr
)
1529 static struct ref_lock
*lock
;
1530 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
1532 const char *str
= "Cannot lock the ref '%s'.";
1534 case MSG_ON_ERR
: error(str
, refname
); break;
1535 case DIE_ON_ERR
: die(str
, refname
); break;
1536 case QUIET_ON_ERR
: break;
1540 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
1541 const char *str
= "Cannot update the ref '%s'.";
1543 case MSG_ON_ERR
: error(str
, refname
); break;
1544 case DIE_ON_ERR
: die(str
, refname
); break;
1545 case QUIET_ON_ERR
: break;
1552 struct ref
*find_ref_by_name(struct ref
*list
, const char *name
)
1554 for ( ; list
; list
= list
->next
)
1555 if (!strcmp(list
->name
, name
))