7 /* ISSYMREF=0x01, ISPACKED=0x02 and ISBROKEN=0x04 are public interfaces */
8 #define REF_KNOWS_PEELED 0x10
11 unsigned char flag
; /* ISSYMREF? ISPACKED? */
12 unsigned char sha1
[20];
13 unsigned char peeled
[20];
14 /* The full name of the reference (e.g., "refs/heads/master"): */
15 char name
[FLEX_ARRAY
];
20 struct ref_entry
**refs
;
24 * Parse one line from a packed-refs file. Write the SHA1 to sha1.
25 * Return a pointer to the refname within the line (null-terminated),
26 * or NULL if there was a problem.
28 static const char *parse_ref_line(char *line
, unsigned char *sha1
)
31 * 42: the answer to everything.
33 * In this case, it happens to be the answer to
34 * 40 (length of sha1 hex representation)
35 * +1 (space in between hex and name)
36 * +1 (newline at the end of the line)
38 int len
= strlen(line
) - 42;
42 if (get_sha1_hex(line
, sha1
) < 0)
44 if (!isspace(line
[40]))
49 if (line
[len
] != '\n')
56 static struct ref_entry
*create_ref_entry(const char *refname
,
57 const unsigned char *sha1
, int flag
,
61 struct ref_entry
*ref
;
64 check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
|REFNAME_DOT_COMPONENT
))
65 die("Reference has invalid format: '%s'", refname
);
66 len
= strlen(refname
) + 1;
67 ref
= xmalloc(sizeof(struct ref_entry
) + len
);
68 hashcpy(ref
->sha1
, sha1
);
70 memcpy(ref
->name
, refname
, len
);
75 /* Add a ref_entry to the end of the ref_array (unsorted). */
76 static void add_ref(const char *refname
, const unsigned char *sha1
,
77 int flag
, int check_name
, struct ref_array
*refs
,
78 struct ref_entry
**new_ref
)
80 struct ref_entry
*ref
= create_ref_entry(refname
, sha1
, flag
, check_name
);
83 ALLOC_GROW(refs
->refs
, refs
->nr
+ 1, refs
->alloc
);
84 refs
->refs
[refs
->nr
++] = ref
;
87 static int ref_entry_cmp(const void *a
, const void *b
)
89 struct ref_entry
*one
= *(struct ref_entry
**)a
;
90 struct ref_entry
*two
= *(struct ref_entry
**)b
;
91 return strcmp(one
->name
, two
->name
);
95 * Emit a warning and return true iff ref1 and ref2 have the same name
96 * and the same sha1. Die if they have the same name but different
99 static int is_dup_ref(const struct ref_entry
*ref1
, const struct ref_entry
*ref2
)
101 if (!strcmp(ref1
->name
, ref2
->name
)) {
102 /* Duplicate name; make sure that the SHA1s match: */
103 if (hashcmp(ref1
->sha1
, ref2
->sha1
))
104 die("Duplicated ref, and SHA1s don't match: %s",
106 warning("Duplicated ref: %s", ref1
->name
);
113 static void sort_ref_array(struct ref_array
*array
)
117 /* Nothing to sort unless there are at least two entries */
121 qsort(array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
123 /* Remove any duplicates from the ref_array */
125 for (j
= 1; j
< array
->nr
; j
++) {
126 if (is_dup_ref(array
->refs
[i
], array
->refs
[j
])) {
127 free(array
->refs
[j
]);
130 array
->refs
[++i
] = array
->refs
[j
];
135 static struct ref_entry
*search_ref_array(struct ref_array
*array
, const char *refname
)
137 struct ref_entry
*e
, **r
;
146 len
= strlen(refname
) + 1;
147 e
= xmalloc(sizeof(struct ref_entry
) + len
);
148 memcpy(e
->name
, refname
, len
);
150 r
= bsearch(&e
, array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
161 * Future: need to be in "struct repository"
162 * when doing a full libification.
164 static struct ref_cache
{
165 struct ref_cache
*next
;
168 struct ref_array loose
;
169 struct ref_array packed
;
170 /* The submodule name, or "" for the main repo. */
171 char name
[FLEX_ARRAY
];
174 static struct ref_entry
*current_ref
;
176 static struct ref_array extra_refs
;
178 static void clear_ref_array(struct ref_array
*array
)
181 for (i
= 0; i
< array
->nr
; i
++)
182 free(array
->refs
[i
]);
184 array
->nr
= array
->alloc
= 0;
188 static void clear_packed_ref_cache(struct ref_cache
*refs
)
190 if (refs
->did_packed
)
191 clear_ref_array(&refs
->packed
);
192 refs
->did_packed
= 0;
195 static void clear_loose_ref_cache(struct ref_cache
*refs
)
198 clear_ref_array(&refs
->loose
);
202 static struct ref_cache
*create_ref_cache(const char *submodule
)
205 struct ref_cache
*refs
;
208 len
= strlen(submodule
) + 1;
209 refs
= xcalloc(1, sizeof(struct ref_cache
) + len
);
210 memcpy(refs
->name
, submodule
, len
);
215 * Return a pointer to a ref_cache for the specified submodule. For
216 * the main repository, use submodule==NULL. The returned structure
217 * will be allocated and initialized but not necessarily populated; it
218 * should not be freed.
220 static struct ref_cache
*get_ref_cache(const char *submodule
)
222 struct ref_cache
*refs
= ref_cache
;
226 if (!strcmp(submodule
, refs
->name
))
231 refs
= create_ref_cache(submodule
);
232 refs
->next
= ref_cache
;
237 void invalidate_ref_cache(const char *submodule
)
239 struct ref_cache
*refs
= get_ref_cache(submodule
);
240 clear_packed_ref_cache(refs
);
241 clear_loose_ref_cache(refs
);
244 static void read_packed_refs(FILE *f
, struct ref_array
*array
)
246 struct ref_entry
*last
= NULL
;
247 char refline
[PATH_MAX
];
248 int flag
= REF_ISPACKED
;
250 while (fgets(refline
, sizeof(refline
), f
)) {
251 unsigned char sha1
[20];
253 static const char header
[] = "# pack-refs with:";
255 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
256 const char *traits
= refline
+ sizeof(header
) - 1;
257 if (strstr(traits
, " peeled "))
258 flag
|= REF_KNOWS_PEELED
;
259 /* perhaps other traits later as well */
263 refname
= parse_ref_line(refline
, sha1
);
265 add_ref(refname
, sha1
, flag
, 1, array
, &last
);
270 strlen(refline
) == 42 &&
271 refline
[41] == '\n' &&
272 !get_sha1_hex(refline
+ 1, sha1
))
273 hashcpy(last
->peeled
, sha1
);
275 sort_ref_array(array
);
278 void add_extra_ref(const char *refname
, const unsigned char *sha1
, int flag
)
280 add_ref(refname
, sha1
, flag
, 0, &extra_refs
, NULL
);
283 void clear_extra_refs(void)
285 clear_ref_array(&extra_refs
);
288 static struct ref_array
*get_packed_refs(struct ref_cache
*refs
)
290 if (!refs
->did_packed
) {
291 const char *packed_refs_file
;
295 packed_refs_file
= git_path_submodule(refs
->name
, "packed-refs");
297 packed_refs_file
= git_path("packed-refs");
298 f
= fopen(packed_refs_file
, "r");
300 read_packed_refs(f
, &refs
->packed
);
303 refs
->did_packed
= 1;
305 return &refs
->packed
;
308 static void get_ref_dir(struct ref_cache
*refs
, const char *base
,
309 struct ref_array
*array
)
315 path
= git_path_submodule(refs
->name
, "%s", base
);
317 path
= git_path("%s", base
);
324 int baselen
= strlen(base
);
325 char *refname
= xmalloc(baselen
+ 257);
327 memcpy(refname
, base
, baselen
);
328 if (baselen
&& base
[baselen
-1] != '/')
329 refname
[baselen
++] = '/';
331 while ((de
= readdir(dir
)) != NULL
) {
332 unsigned char sha1
[20];
338 if (de
->d_name
[0] == '.')
340 namelen
= strlen(de
->d_name
);
343 if (has_extension(de
->d_name
, ".lock"))
345 memcpy(refname
+ baselen
, de
->d_name
, namelen
+1);
347 ? git_path_submodule(refs
->name
, "%s", refname
)
348 : git_path("%s", refname
);
349 if (stat(refdir
, &st
) < 0)
351 if (S_ISDIR(st
.st_mode
)) {
352 get_ref_dir(refs
, refname
, array
);
358 if (resolve_gitlink_ref(refs
->name
, refname
, sha1
) < 0) {
360 flag
|= REF_ISBROKEN
;
362 } else if (read_ref_full(refname
, sha1
, 1, &flag
)) {
364 flag
|= REF_ISBROKEN
;
366 add_ref(refname
, sha1
, flag
, 1, array
, NULL
);
373 struct warn_if_dangling_data
{
379 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
380 int flags
, void *cb_data
)
382 struct warn_if_dangling_data
*d
= cb_data
;
383 const char *resolves_to
;
384 unsigned char junk
[20];
386 if (!(flags
& REF_ISSYMREF
))
389 resolves_to
= resolve_ref(refname
, junk
, 0, NULL
);
390 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
393 fprintf(d
->fp
, d
->msg_fmt
, refname
);
397 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
399 struct warn_if_dangling_data data
;
402 data
.refname
= refname
;
403 data
.msg_fmt
= msg_fmt
;
404 for_each_rawref(warn_if_dangling_symref
, &data
);
407 static struct ref_array
*get_loose_refs(struct ref_cache
*refs
)
409 if (!refs
->did_loose
) {
410 get_ref_dir(refs
, "refs", &refs
->loose
);
411 sort_ref_array(&refs
->loose
);
417 /* We allow "recursive" symbolic refs. Only within reason, though */
419 #define MAXREFLEN (1024)
422 * Called by resolve_gitlink_ref_recursive() after it failed to read
423 * from the loose refs in ref_cache refs. Find <refname> in the
424 * packed-refs file for the submodule.
426 static int resolve_gitlink_packed_ref(struct ref_cache
*refs
,
427 const char *refname
, unsigned char *sha1
)
429 struct ref_entry
*ref
;
430 struct ref_array
*array
= get_packed_refs(refs
);
432 ref
= search_ref_array(array
, refname
);
436 memcpy(sha1
, ref
->sha1
, 20);
440 static int resolve_gitlink_ref_recursive(struct ref_cache
*refs
,
441 const char *refname
, unsigned char *sha1
,
445 char buffer
[128], *p
;
448 if (recursion
> MAXDEPTH
|| strlen(refname
) > MAXREFLEN
)
451 ? git_path_submodule(refs
->name
, "%s", refname
)
452 : git_path("%s", refname
);
453 fd
= open(path
, O_RDONLY
);
455 return resolve_gitlink_packed_ref(refs
, refname
, sha1
);
457 len
= read(fd
, buffer
, sizeof(buffer
)-1);
461 while (len
&& isspace(buffer
[len
-1]))
465 /* Was it a detached head or an old-fashioned symlink? */
466 if (!get_sha1_hex(buffer
, sha1
))
470 if (strncmp(buffer
, "ref:", 4))
476 return resolve_gitlink_ref_recursive(refs
, p
, sha1
, recursion
+1);
479 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *sha1
)
481 int len
= strlen(path
), retval
;
483 struct ref_cache
*refs
;
485 while (len
&& path
[len
-1] == '/')
489 submodule
= xstrndup(path
, len
);
490 refs
= get_ref_cache(submodule
);
493 retval
= resolve_gitlink_ref_recursive(refs
, refname
, sha1
, 0);
498 * Try to read ref from the packed references. On success, set sha1
499 * and return 0; otherwise, return -1.
501 static int get_packed_ref(const char *refname
, unsigned char *sha1
)
503 struct ref_array
*packed
= get_packed_refs(get_ref_cache(NULL
));
504 struct ref_entry
*entry
= search_ref_array(packed
, refname
);
506 hashcpy(sha1
, entry
->sha1
);
512 const char *resolve_ref(const char *refname
, unsigned char *sha1
, int reading
, int *flag
)
514 int depth
= MAXDEPTH
;
517 static char refname_buffer
[256];
522 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
534 git_snpath(path
, sizeof(path
), "%s", refname
);
536 if (lstat(path
, &st
) < 0) {
540 * The loose reference file does not exist;
541 * check for a packed reference.
543 if (!get_packed_ref(refname
, sha1
)) {
545 *flag
|= REF_ISPACKED
;
548 /* The reference is not a packed reference, either. */
557 /* Follow "normalized" - ie "refs/.." symlinks by hand */
558 if (S_ISLNK(st
.st_mode
)) {
559 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
563 if (!prefixcmp(buffer
, "refs/") &&
564 !check_refname_format(buffer
, 0)) {
565 strcpy(refname_buffer
, buffer
);
566 refname
= refname_buffer
;
568 *flag
|= REF_ISSYMREF
;
573 /* Is it a directory? */
574 if (S_ISDIR(st
.st_mode
)) {
580 * Anything else, just open it and try to use it as
583 fd
= open(path
, O_RDONLY
);
586 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
590 while (len
&& isspace(buffer
[len
-1]))
595 * Is it a symbolic ref?
597 if (prefixcmp(buffer
, "ref:"))
600 *flag
|= REF_ISSYMREF
;
602 while (isspace(*buf
))
604 if (check_refname_format(buf
, REFNAME_ALLOW_ONELEVEL
)) {
606 *flag
|= REF_ISBROKEN
;
609 refname
= strcpy(refname_buffer
, buf
);
611 /* Please note that FETCH_HEAD has a second line containing other data. */
612 if (get_sha1_hex(buffer
, sha1
) || (buffer
[40] != '\0' && !isspace(buffer
[40]))) {
614 *flag
|= REF_ISBROKEN
;
620 /* The argument to filter_refs */
627 int read_ref_full(const char *refname
, unsigned char *sha1
, int reading
, int *flags
)
629 if (resolve_ref(refname
, sha1
, reading
, flags
))
634 int read_ref(const char *refname
, unsigned char *sha1
)
636 return read_ref_full(refname
, sha1
, 1, NULL
);
639 #define DO_FOR_EACH_INCLUDE_BROKEN 01
640 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
641 int flags
, void *cb_data
, struct ref_entry
*entry
)
643 if (prefixcmp(entry
->name
, base
))
646 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
647 if (entry
->flag
& REF_ISBROKEN
)
648 return 0; /* ignore broken refs e.g. dangling symref */
649 if (!has_sha1_file(entry
->sha1
)) {
650 error("%s does not point to a valid object!", entry
->name
);
655 return fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
658 static int filter_refs(const char *refname
, const unsigned char *sha1
, int flags
,
661 struct ref_filter
*filter
= (struct ref_filter
*)data
;
662 if (fnmatch(filter
->pattern
, refname
, 0))
664 return filter
->fn(refname
, sha1
, flags
, filter
->cb_data
);
667 int peel_ref(const char *refname
, unsigned char *sha1
)
670 unsigned char base
[20];
673 if (current_ref
&& (current_ref
->name
== refname
674 || !strcmp(current_ref
->name
, refname
))) {
675 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
676 hashcpy(sha1
, current_ref
->peeled
);
679 hashcpy(base
, current_ref
->sha1
);
683 if (read_ref_full(refname
, base
, 1, &flag
))
686 if ((flag
& REF_ISPACKED
)) {
687 struct ref_array
*array
= get_packed_refs(get_ref_cache(NULL
));
688 struct ref_entry
*r
= search_ref_array(array
, refname
);
690 if (r
!= NULL
&& r
->flag
& REF_KNOWS_PEELED
) {
691 hashcpy(sha1
, r
->peeled
);
697 o
= parse_object(base
);
698 if (o
&& o
->type
== OBJ_TAG
) {
699 o
= deref_tag(o
, refname
, 0);
701 hashcpy(sha1
, o
->sha1
);
708 static int do_for_each_ref(const char *submodule
, const char *base
, each_ref_fn fn
,
709 int trim
, int flags
, void *cb_data
)
711 int retval
= 0, i
, p
= 0, l
= 0;
712 struct ref_cache
*refs
= get_ref_cache(submodule
);
713 struct ref_array
*packed
= get_packed_refs(refs
);
714 struct ref_array
*loose
= get_loose_refs(refs
);
716 struct ref_array
*extra
= &extra_refs
;
718 for (i
= 0; i
< extra
->nr
; i
++)
719 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, extra
->refs
[i
]);
721 while (p
< packed
->nr
&& l
< loose
->nr
) {
722 struct ref_entry
*entry
;
723 int cmp
= strcmp(packed
->refs
[p
]->name
, loose
->refs
[l
]->name
);
729 entry
= loose
->refs
[l
++];
731 entry
= packed
->refs
[p
++];
733 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, entry
);
743 for (; p
< packed
->nr
; p
++) {
744 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, packed
->refs
[p
]);
755 static int do_head_ref(const char *submodule
, each_ref_fn fn
, void *cb_data
)
757 unsigned char sha1
[20];
761 if (resolve_gitlink_ref(submodule
, "HEAD", sha1
) == 0)
762 return fn("HEAD", sha1
, 0, cb_data
);
767 if (!read_ref_full("HEAD", sha1
, 1, &flag
))
768 return fn("HEAD", sha1
, flag
, cb_data
);
773 int head_ref(each_ref_fn fn
, void *cb_data
)
775 return do_head_ref(NULL
, fn
, cb_data
);
778 int head_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
780 return do_head_ref(submodule
, fn
, cb_data
);
783 int for_each_ref(each_ref_fn fn
, void *cb_data
)
785 return do_for_each_ref(NULL
, "", fn
, 0, 0, cb_data
);
788 int for_each_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
790 return do_for_each_ref(submodule
, "", fn
, 0, 0, cb_data
);
793 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
795 return do_for_each_ref(NULL
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
798 int for_each_ref_in_submodule(const char *submodule
, const char *prefix
,
799 each_ref_fn fn
, void *cb_data
)
801 return do_for_each_ref(submodule
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
804 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
806 return for_each_ref_in("refs/tags/", fn
, cb_data
);
809 int for_each_tag_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
811 return for_each_ref_in_submodule(submodule
, "refs/tags/", fn
, cb_data
);
814 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
816 return for_each_ref_in("refs/heads/", fn
, cb_data
);
819 int for_each_branch_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
821 return for_each_ref_in_submodule(submodule
, "refs/heads/", fn
, cb_data
);
824 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
826 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
829 int for_each_remote_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
831 return for_each_ref_in_submodule(submodule
, "refs/remotes/", fn
, cb_data
);
834 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
836 return do_for_each_ref(NULL
, "refs/replace/", fn
, 13, 0, cb_data
);
839 int head_ref_namespaced(each_ref_fn fn
, void *cb_data
)
841 struct strbuf buf
= STRBUF_INIT
;
843 unsigned char sha1
[20];
846 strbuf_addf(&buf
, "%sHEAD", get_git_namespace());
847 if (!read_ref_full(buf
.buf
, sha1
, 1, &flag
))
848 ret
= fn(buf
.buf
, sha1
, flag
, cb_data
);
849 strbuf_release(&buf
);
854 int for_each_namespaced_ref(each_ref_fn fn
, void *cb_data
)
856 struct strbuf buf
= STRBUF_INIT
;
858 strbuf_addf(&buf
, "%srefs/", get_git_namespace());
859 ret
= do_for_each_ref(NULL
, buf
.buf
, fn
, 0, 0, cb_data
);
860 strbuf_release(&buf
);
864 int for_each_glob_ref_in(each_ref_fn fn
, const char *pattern
,
865 const char *prefix
, void *cb_data
)
867 struct strbuf real_pattern
= STRBUF_INIT
;
868 struct ref_filter filter
;
871 if (!prefix
&& prefixcmp(pattern
, "refs/"))
872 strbuf_addstr(&real_pattern
, "refs/");
874 strbuf_addstr(&real_pattern
, prefix
);
875 strbuf_addstr(&real_pattern
, pattern
);
877 if (!has_glob_specials(pattern
)) {
878 /* Append implied '/' '*' if not present. */
879 if (real_pattern
.buf
[real_pattern
.len
- 1] != '/')
880 strbuf_addch(&real_pattern
, '/');
881 /* No need to check for '*', there is none. */
882 strbuf_addch(&real_pattern
, '*');
885 filter
.pattern
= real_pattern
.buf
;
887 filter
.cb_data
= cb_data
;
888 ret
= for_each_ref(filter_refs
, &filter
);
890 strbuf_release(&real_pattern
);
894 int for_each_glob_ref(each_ref_fn fn
, const char *pattern
, void *cb_data
)
896 return for_each_glob_ref_in(fn
, pattern
, NULL
, cb_data
);
899 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
901 return do_for_each_ref(NULL
, "", fn
, 0,
902 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
906 * Make sure "ref" is something reasonable to have under ".git/refs/";
907 * We do not like it if:
909 * - any path component of it begins with ".", or
910 * - it has double dots "..", or
911 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
912 * - it ends with a "/".
913 * - it ends with ".lock"
914 * - it contains a "\" (backslash)
917 /* Return true iff ch is not allowed in reference names. */
918 static inline int bad_ref_char(int ch
)
920 if (((unsigned) ch
) <= ' ' || ch
== 0x7f ||
921 ch
== '~' || ch
== '^' || ch
== ':' || ch
== '\\')
923 /* 2.13 Pattern Matching Notation */
924 if (ch
== '*' || ch
== '?' || ch
== '[') /* Unsupported */
930 * Try to read one refname component from the front of refname. Return
931 * the length of the component found, or -1 if the component is not
934 static int check_refname_component(const char *refname
, int flags
)
939 for (cp
= refname
; ; cp
++) {
941 if (ch
== '\0' || ch
== '/')
943 if (bad_ref_char(ch
))
944 return -1; /* Illegal character in refname. */
945 if (last
== '.' && ch
== '.')
946 return -1; /* Refname contains "..". */
947 if (last
== '@' && ch
== '{')
948 return -1; /* Refname contains "@{". */
952 return -1; /* Component has zero length. */
953 if (refname
[0] == '.') {
954 if (!(flags
& REFNAME_DOT_COMPONENT
))
955 return -1; /* Component starts with '.'. */
957 * Even if leading dots are allowed, don't allow "."
958 * as a component (".." is prevented by a rule above).
960 if (refname
[1] == '\0')
961 return -1; /* Component equals ".". */
963 if (cp
- refname
>= 5 && !memcmp(cp
- 5, ".lock", 5))
964 return -1; /* Refname ends with ".lock". */
968 int check_refname_format(const char *refname
, int flags
)
970 int component_len
, component_count
= 0;
973 /* We are at the start of a path component. */
974 component_len
= check_refname_component(refname
, flags
);
975 if (component_len
< 0) {
976 if ((flags
& REFNAME_REFSPEC_PATTERN
) &&
978 (refname
[1] == '\0' || refname
[1] == '/')) {
979 /* Accept one wildcard as a full refname component. */
980 flags
&= ~REFNAME_REFSPEC_PATTERN
;
987 if (refname
[component_len
] == '\0')
989 /* Skip to next component. */
990 refname
+= component_len
+ 1;
993 if (refname
[component_len
- 1] == '.')
994 return -1; /* Refname ends with '.'. */
995 if (!(flags
& REFNAME_ALLOW_ONELEVEL
) && component_count
< 2)
996 return -1; /* Refname has only one component. */
1000 const char *prettify_refname(const char *name
)
1003 !prefixcmp(name
, "refs/heads/") ? 11 :
1004 !prefixcmp(name
, "refs/tags/") ? 10 :
1005 !prefixcmp(name
, "refs/remotes/") ? 13 :
1009 const char *ref_rev_parse_rules
[] = {
1014 "refs/remotes/%.*s",
1015 "refs/remotes/%.*s/HEAD",
1019 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
1022 const int abbrev_name_len
= strlen(abbrev_name
);
1024 for (p
= rules
; *p
; p
++) {
1025 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
1033 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
1034 const unsigned char *old_sha1
, int mustexist
)
1036 if (read_ref_full(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
1037 error("Can't verify ref %s", lock
->ref_name
);
1041 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
1042 error("Ref %s is at %s but expected %s", lock
->ref_name
,
1043 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
1050 static int remove_empty_directories(const char *file
)
1052 /* we want to create a file but there is a directory there;
1053 * if that is an empty directory (or a directory that contains
1054 * only empty directories), remove them.
1059 strbuf_init(&path
, 20);
1060 strbuf_addstr(&path
, file
);
1062 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
1064 strbuf_release(&path
);
1070 * Return true iff a reference named refname could be created without
1071 * conflicting with the name of an existing reference. If oldrefname
1072 * is non-NULL, ignore potential conflicts with oldrefname (e.g.,
1073 * because oldrefname is scheduled for deletion in the same
1076 static int is_refname_available(const char *refname
, const char *oldrefname
,
1077 struct ref_array
*array
)
1079 int i
, namlen
= strlen(refname
); /* e.g. 'foo/bar' */
1080 for (i
= 0; i
< array
->nr
; i
++ ) {
1081 struct ref_entry
*entry
= array
->refs
[i
];
1082 /* entry->name could be 'foo' or 'foo/bar/baz' */
1083 if (!oldrefname
|| strcmp(oldrefname
, entry
->name
)) {
1084 int len
= strlen(entry
->name
);
1085 int cmplen
= (namlen
< len
) ? namlen
: len
;
1086 const char *lead
= (namlen
< len
) ? entry
->name
: refname
;
1087 if (!strncmp(refname
, entry
->name
, cmplen
) &&
1088 lead
[cmplen
] == '/') {
1089 error("'%s' exists; cannot create '%s'",
1090 entry
->name
, refname
);
1099 * *string and *len will only be substituted, and *string returned (for
1100 * later free()ing) if the string passed in is a magic short-hand form
1103 static char *substitute_branch_name(const char **string
, int *len
)
1105 struct strbuf buf
= STRBUF_INIT
;
1106 int ret
= interpret_branch_name(*string
, &buf
);
1110 *string
= strbuf_detach(&buf
, &size
);
1112 return (char *)*string
;
1118 int dwim_ref(const char *str
, int len
, unsigned char *sha1
, char **ref
)
1120 char *last_branch
= substitute_branch_name(&str
, &len
);
1125 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1126 char fullref
[PATH_MAX
];
1127 unsigned char sha1_from_ref
[20];
1128 unsigned char *this_result
;
1131 this_result
= refs_found
? sha1_from_ref
: sha1
;
1132 mksnpath(fullref
, sizeof(fullref
), *p
, len
, str
);
1133 r
= resolve_ref(fullref
, this_result
, 1, &flag
);
1137 if (!warn_ambiguous_refs
)
1139 } else if ((flag
& REF_ISSYMREF
) && strcmp(fullref
, "HEAD")) {
1140 warning("ignoring dangling symref %s.", fullref
);
1141 } else if ((flag
& REF_ISBROKEN
) && strchr(fullref
, '/')) {
1142 warning("ignoring broken ref %s.", fullref
);
1149 int dwim_log(const char *str
, int len
, unsigned char *sha1
, char **log
)
1151 char *last_branch
= substitute_branch_name(&str
, &len
);
1156 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1158 unsigned char hash
[20];
1159 char path
[PATH_MAX
];
1160 const char *ref
, *it
;
1162 mksnpath(path
, sizeof(path
), *p
, len
, str
);
1163 ref
= resolve_ref(path
, hash
, 1, NULL
);
1166 if (!stat(git_path("logs/%s", path
), &st
) &&
1167 S_ISREG(st
.st_mode
))
1169 else if (strcmp(ref
, path
) &&
1170 !stat(git_path("logs/%s", ref
), &st
) &&
1171 S_ISREG(st
.st_mode
))
1175 if (!logs_found
++) {
1177 hashcpy(sha1
, hash
);
1179 if (!warn_ambiguous_refs
)
1186 static struct ref_lock
*lock_ref_sha1_basic(const char *refname
,
1187 const unsigned char *old_sha1
,
1188 int flags
, int *type_p
)
1191 const char *orig_refname
= refname
;
1192 struct ref_lock
*lock
;
1195 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1198 lock
= xcalloc(1, sizeof(struct ref_lock
));
1201 refname
= resolve_ref(refname
, lock
->old_sha1
, mustexist
, &type
);
1202 if (!refname
&& errno
== EISDIR
) {
1203 /* we are trying to lock foo but we used to
1204 * have foo/bar which now does not exist;
1205 * it is normal for the empty directory 'foo'
1208 ref_file
= git_path("%s", orig_refname
);
1209 if (remove_empty_directories(ref_file
)) {
1211 error("there are still refs under '%s'", orig_refname
);
1214 refname
= resolve_ref(orig_refname
, lock
->old_sha1
, mustexist
, &type
);
1220 error("unable to resolve reference %s: %s",
1221 orig_refname
, strerror(errno
));
1224 missing
= is_null_sha1(lock
->old_sha1
);
1225 /* When the ref did not exist and we are creating it,
1226 * make sure there is no existing ref that is packed
1227 * whose name begins with our refname, nor a ref whose
1228 * name is a proper prefix of our refname.
1231 !is_refname_available(refname
, NULL
, get_packed_refs(get_ref_cache(NULL
)))) {
1232 last_errno
= ENOTDIR
;
1236 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1238 lflags
= LOCK_DIE_ON_ERROR
;
1239 if (flags
& REF_NODEREF
) {
1240 refname
= orig_refname
;
1241 lflags
|= LOCK_NODEREF
;
1243 lock
->ref_name
= xstrdup(refname
);
1244 lock
->orig_ref_name
= xstrdup(orig_refname
);
1245 ref_file
= git_path("%s", refname
);
1247 lock
->force_write
= 1;
1248 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
1249 lock
->force_write
= 1;
1251 if (safe_create_leading_directories(ref_file
)) {
1253 error("unable to create directory for %s", ref_file
);
1257 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
1258 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
1266 struct ref_lock
*lock_ref_sha1(const char *refname
, const unsigned char *old_sha1
)
1268 char refpath
[PATH_MAX
];
1269 if (check_refname_format(refname
, 0))
1271 strcpy(refpath
, mkpath("refs/%s", refname
));
1272 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
1275 struct ref_lock
*lock_any_ref_for_update(const char *refname
,
1276 const unsigned char *old_sha1
, int flags
)
1278 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
1280 return lock_ref_sha1_basic(refname
, old_sha1
, flags
, NULL
);
1283 static struct lock_file packlock
;
1285 static int repack_without_ref(const char *refname
)
1287 struct ref_array
*packed
;
1290 packed
= get_packed_refs(get_ref_cache(NULL
));
1291 if (search_ref_array(packed
, refname
) == NULL
)
1293 fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
1295 unable_to_lock_error(git_path("packed-refs"), errno
);
1296 return error("cannot delete '%s' from packed refs", refname
);
1299 for (i
= 0; i
< packed
->nr
; i
++) {
1300 char line
[PATH_MAX
+ 100];
1302 struct ref_entry
*ref
= packed
->refs
[i
];
1304 if (!strcmp(refname
, ref
->name
))
1306 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1307 sha1_to_hex(ref
->sha1
), ref
->name
);
1308 /* this should not happen but just being defensive */
1309 if (len
> sizeof(line
))
1310 die("too long a refname '%s'", ref
->name
);
1311 write_or_die(fd
, line
, len
);
1313 return commit_lock_file(&packlock
);
1316 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1318 struct ref_lock
*lock
;
1319 int err
, i
= 0, ret
= 0, flag
= 0;
1321 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1324 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1328 if (!(delopt
& REF_NODEREF
)) {
1329 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1330 lock
->lk
->filename
[i
] = 0;
1331 path
= lock
->lk
->filename
;
1333 path
= git_path("%s", refname
);
1335 err
= unlink_or_warn(path
);
1336 if (err
&& errno
!= ENOENT
)
1339 if (!(delopt
& REF_NODEREF
))
1340 lock
->lk
->filename
[i
] = '.';
1342 /* removing the loose one could have resurrected an earlier
1343 * packed one. Also, if it was not loose we need to repack
1346 ret
|= repack_without_ref(refname
);
1348 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1349 invalidate_ref_cache(NULL
);
1355 * People using contrib's git-new-workdir have .git/logs/refs ->
1356 * /some/other/path/.git/logs/refs, and that may live on another device.
1358 * IOW, to avoid cross device rename errors, the temporary renamed log must
1359 * live into logs/refs.
1361 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1363 int rename_ref(const char *oldrefname
, const char *newrefname
, const char *logmsg
)
1365 unsigned char sha1
[20], orig_sha1
[20];
1366 int flag
= 0, logmoved
= 0;
1367 struct ref_lock
*lock
;
1368 struct stat loginfo
;
1369 int log
= !lstat(git_path("logs/%s", oldrefname
), &loginfo
);
1370 const char *symref
= NULL
;
1371 struct ref_cache
*refs
= get_ref_cache(NULL
);
1373 if (log
&& S_ISLNK(loginfo
.st_mode
))
1374 return error("reflog for %s is a symlink", oldrefname
);
1376 symref
= resolve_ref(oldrefname
, orig_sha1
, 1, &flag
);
1377 if (flag
& REF_ISSYMREF
)
1378 return error("refname %s is a symbolic ref, renaming it is not supported",
1381 return error("refname %s not found", oldrefname
);
1383 if (!is_refname_available(newrefname
, oldrefname
, get_packed_refs(refs
)))
1386 if (!is_refname_available(newrefname
, oldrefname
, get_loose_refs(refs
)))
1389 if (log
&& rename(git_path("logs/%s", oldrefname
), git_path(TMP_RENAMED_LOG
)))
1390 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG
": %s",
1391 oldrefname
, strerror(errno
));
1393 if (delete_ref(oldrefname
, orig_sha1
, REF_NODEREF
)) {
1394 error("unable to delete old %s", oldrefname
);
1398 if (!read_ref_full(newrefname
, sha1
, 1, &flag
) &&
1399 delete_ref(newrefname
, sha1
, REF_NODEREF
)) {
1400 if (errno
==EISDIR
) {
1401 if (remove_empty_directories(git_path("%s", newrefname
))) {
1402 error("Directory not empty: %s", newrefname
);
1406 error("unable to delete existing %s", newrefname
);
1411 if (log
&& safe_create_leading_directories(git_path("logs/%s", newrefname
))) {
1412 error("unable to create directory for %s", newrefname
);
1417 if (log
&& rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", newrefname
))) {
1418 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1420 * rename(a, b) when b is an existing
1421 * directory ought to result in ISDIR, but
1422 * Solaris 5.8 gives ENOTDIR. Sheesh.
1424 if (remove_empty_directories(git_path("logs/%s", newrefname
))) {
1425 error("Directory not empty: logs/%s", newrefname
);
1430 error("unable to move logfile "TMP_RENAMED_LOG
" to logs/%s: %s",
1431 newrefname
, strerror(errno
));
1437 lock
= lock_ref_sha1_basic(newrefname
, NULL
, 0, NULL
);
1439 error("unable to lock %s for update", newrefname
);
1442 lock
->force_write
= 1;
1443 hashcpy(lock
->old_sha1
, orig_sha1
);
1444 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1445 error("unable to write current sha1 into %s", newrefname
);
1452 lock
= lock_ref_sha1_basic(oldrefname
, NULL
, 0, NULL
);
1454 error("unable to lock %s for rollback", oldrefname
);
1458 lock
->force_write
= 1;
1459 flag
= log_all_ref_updates
;
1460 log_all_ref_updates
= 0;
1461 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1462 error("unable to write current sha1 into %s", oldrefname
);
1463 log_all_ref_updates
= flag
;
1466 if (logmoved
&& rename(git_path("logs/%s", newrefname
), git_path("logs/%s", oldrefname
)))
1467 error("unable to restore logfile %s from %s: %s",
1468 oldrefname
, newrefname
, strerror(errno
));
1469 if (!logmoved
&& log
&&
1470 rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", oldrefname
)))
1471 error("unable to restore logfile %s from "TMP_RENAMED_LOG
": %s",
1472 oldrefname
, strerror(errno
));
1477 int close_ref(struct ref_lock
*lock
)
1479 if (close_lock_file(lock
->lk
))
1485 int commit_ref(struct ref_lock
*lock
)
1487 if (commit_lock_file(lock
->lk
))
1493 void unlock_ref(struct ref_lock
*lock
)
1495 /* Do not free lock->lk -- atexit() still looks at them */
1497 rollback_lock_file(lock
->lk
);
1498 free(lock
->ref_name
);
1499 free(lock
->orig_ref_name
);
1504 * copy the reflog message msg to buf, which has been allocated sufficiently
1505 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1506 * because reflog file is one line per entry.
1508 static int copy_msg(char *buf
, const char *msg
)
1515 while ((c
= *msg
++)) {
1516 if (wasspace
&& isspace(c
))
1518 wasspace
= isspace(c
);
1523 while (buf
< cp
&& isspace(cp
[-1]))
1529 int log_ref_setup(const char *refname
, char *logfile
, int bufsize
)
1531 int logfd
, oflags
= O_APPEND
| O_WRONLY
;
1533 git_snpath(logfile
, bufsize
, "logs/%s", refname
);
1534 if (log_all_ref_updates
&&
1535 (!prefixcmp(refname
, "refs/heads/") ||
1536 !prefixcmp(refname
, "refs/remotes/") ||
1537 !prefixcmp(refname
, "refs/notes/") ||
1538 !strcmp(refname
, "HEAD"))) {
1539 if (safe_create_leading_directories(logfile
) < 0)
1540 return error("unable to create directory for %s",
1545 logfd
= open(logfile
, oflags
, 0666);
1547 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1550 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1551 if (remove_empty_directories(logfile
)) {
1552 return error("There are still logs under '%s'",
1555 logfd
= open(logfile
, oflags
, 0666);
1559 return error("Unable to append to %s: %s",
1560 logfile
, strerror(errno
));
1563 adjust_shared_perm(logfile
);
1568 static int log_ref_write(const char *refname
, const unsigned char *old_sha1
,
1569 const unsigned char *new_sha1
, const char *msg
)
1571 int logfd
, result
, written
, oflags
= O_APPEND
| O_WRONLY
;
1572 unsigned maxlen
, len
;
1574 char log_file
[PATH_MAX
];
1576 const char *committer
;
1578 if (log_all_ref_updates
< 0)
1579 log_all_ref_updates
= !is_bare_repository();
1581 result
= log_ref_setup(refname
, log_file
, sizeof(log_file
));
1585 logfd
= open(log_file
, oflags
);
1588 msglen
= msg
? strlen(msg
) : 0;
1589 committer
= git_committer_info(0);
1590 maxlen
= strlen(committer
) + msglen
+ 100;
1591 logrec
= xmalloc(maxlen
);
1592 len
= sprintf(logrec
, "%s %s %s\n",
1593 sha1_to_hex(old_sha1
),
1594 sha1_to_hex(new_sha1
),
1597 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1598 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1600 if (close(logfd
) != 0 || written
!= len
)
1601 return error("Unable to append to %s", log_file
);
1605 static int is_branch(const char *refname
)
1607 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1610 int write_ref_sha1(struct ref_lock
*lock
,
1611 const unsigned char *sha1
, const char *logmsg
)
1613 static char term
= '\n';
1618 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1622 o
= parse_object(sha1
);
1624 error("Trying to write ref %s with nonexistent object %s",
1625 lock
->ref_name
, sha1_to_hex(sha1
));
1629 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1630 error("Trying to write non-commit object %s to branch %s",
1631 sha1_to_hex(sha1
), lock
->ref_name
);
1635 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1636 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1637 || close_ref(lock
) < 0) {
1638 error("Couldn't write %s", lock
->lk
->filename
);
1642 clear_loose_ref_cache(get_ref_cache(NULL
));
1643 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1644 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1645 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1649 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1651 * Special hack: If a branch is updated directly and HEAD
1652 * points to it (may happen on the remote side of a push
1653 * for example) then logically the HEAD reflog should be
1655 * A generic solution implies reverse symref information,
1656 * but finding all symrefs pointing to the given branch
1657 * would be rather costly for this rare event (the direct
1658 * update of a branch) to be worth it. So let's cheat and
1659 * check with HEAD only which should cover 99% of all usage
1660 * scenarios (even 100% of the default ones).
1662 unsigned char head_sha1
[20];
1664 const char *head_ref
;
1665 head_ref
= resolve_ref("HEAD", head_sha1
, 1, &head_flag
);
1666 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1667 !strcmp(head_ref
, lock
->ref_name
))
1668 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1670 if (commit_ref(lock
)) {
1671 error("Couldn't set %s", lock
->ref_name
);
1679 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1682 const char *lockpath
;
1684 int fd
, len
, written
;
1685 char *git_HEAD
= git_pathdup("%s", ref_target
);
1686 unsigned char old_sha1
[20], new_sha1
[20];
1688 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1691 if (safe_create_leading_directories(git_HEAD
) < 0)
1692 return error("unable to create directory for %s", git_HEAD
);
1694 #ifndef NO_SYMLINK_HEAD
1695 if (prefer_symlink_refs
) {
1697 if (!symlink(refs_heads_master
, git_HEAD
))
1699 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1703 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1704 if (sizeof(ref
) <= len
) {
1705 error("refname too long: %s", refs_heads_master
);
1706 goto error_free_return
;
1708 lockpath
= mkpath("%s.lock", git_HEAD
);
1709 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1711 error("Unable to open %s for writing", lockpath
);
1712 goto error_free_return
;
1714 written
= write_in_full(fd
, ref
, len
);
1715 if (close(fd
) != 0 || written
!= len
) {
1716 error("Unable to write to %s", lockpath
);
1717 goto error_unlink_return
;
1719 if (rename(lockpath
, git_HEAD
) < 0) {
1720 error("Unable to create %s", git_HEAD
);
1721 goto error_unlink_return
;
1723 if (adjust_shared_perm(git_HEAD
)) {
1724 error("Unable to fix permissions on %s", lockpath
);
1725 error_unlink_return
:
1726 unlink_or_warn(lockpath
);
1732 #ifndef NO_SYMLINK_HEAD
1735 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1736 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1742 static char *ref_msg(const char *line
, const char *endp
)
1746 ep
= memchr(line
, '\n', endp
- line
);
1749 return xmemdupz(line
, ep
- line
);
1752 int read_ref_at(const char *refname
, unsigned long at_time
, int cnt
,
1753 unsigned char *sha1
, char **msg
,
1754 unsigned long *cutoff_time
, int *cutoff_tz
, int *cutoff_cnt
)
1756 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1758 int logfd
, tz
, reccnt
= 0;
1761 unsigned char logged_sha1
[20];
1765 logfile
= git_path("logs/%s", refname
);
1766 logfd
= open(logfile
, O_RDONLY
, 0);
1768 die_errno("Unable to read log '%s'", logfile
);
1771 die("Log %s is empty.", logfile
);
1772 mapsz
= xsize_t(st
.st_size
);
1773 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1774 logdata
= log_mapped
;
1778 rec
= logend
= logdata
+ st
.st_size
;
1779 while (logdata
< rec
) {
1781 if (logdata
< rec
&& *(rec
-1) == '\n')
1784 while (logdata
< rec
&& *(rec
-1) != '\n') {
1790 die("Log %s is corrupt.", logfile
);
1791 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1792 if (date
<= at_time
|| cnt
== 0) {
1793 tz
= strtoul(tz_c
, NULL
, 10);
1795 *msg
= ref_msg(rec
, logend
);
1797 *cutoff_time
= date
;
1801 *cutoff_cnt
= reccnt
- 1;
1803 if (get_sha1_hex(lastrec
, logged_sha1
))
1804 die("Log %s is corrupt.", logfile
);
1805 if (get_sha1_hex(rec
+ 41, sha1
))
1806 die("Log %s is corrupt.", logfile
);
1807 if (hashcmp(logged_sha1
, sha1
)) {
1808 warning("Log %s has gap after %s.",
1809 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1812 else if (date
== at_time
) {
1813 if (get_sha1_hex(rec
+ 41, sha1
))
1814 die("Log %s is corrupt.", logfile
);
1817 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1818 die("Log %s is corrupt.", logfile
);
1819 if (hashcmp(logged_sha1
, sha1
)) {
1820 warning("Log %s unexpectedly ended on %s.",
1821 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1824 munmap(log_mapped
, mapsz
);
1833 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1835 if (rec
== logend
|| *rec
== '\n')
1836 die("Log %s is corrupt.", logfile
);
1837 date
= strtoul(rec
+ 1, &tz_c
, 10);
1838 tz
= strtoul(tz_c
, NULL
, 10);
1839 if (get_sha1_hex(logdata
, sha1
))
1840 die("Log %s is corrupt.", logfile
);
1841 if (is_null_sha1(sha1
)) {
1842 if (get_sha1_hex(logdata
+ 41, sha1
))
1843 die("Log %s is corrupt.", logfile
);
1846 *msg
= ref_msg(logdata
, logend
);
1847 munmap(log_mapped
, mapsz
);
1850 *cutoff_time
= date
;
1854 *cutoff_cnt
= reccnt
;
1858 int for_each_recent_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1860 const char *logfile
;
1862 struct strbuf sb
= STRBUF_INIT
;
1865 logfile
= git_path("logs/%s", refname
);
1866 logfp
= fopen(logfile
, "r");
1871 struct stat statbuf
;
1872 if (fstat(fileno(logfp
), &statbuf
) ||
1873 statbuf
.st_size
< ofs
||
1874 fseek(logfp
, -ofs
, SEEK_END
) ||
1875 strbuf_getwholeline(&sb
, logfp
, '\n')) {
1877 strbuf_release(&sb
);
1882 while (!strbuf_getwholeline(&sb
, logfp
, '\n')) {
1883 unsigned char osha1
[20], nsha1
[20];
1884 char *email_end
, *message
;
1885 unsigned long timestamp
;
1888 /* old SP new SP name <email> SP time TAB msg LF */
1889 if (sb
.len
< 83 || sb
.buf
[sb
.len
- 1] != '\n' ||
1890 get_sha1_hex(sb
.buf
, osha1
) || sb
.buf
[40] != ' ' ||
1891 get_sha1_hex(sb
.buf
+ 41, nsha1
) || sb
.buf
[81] != ' ' ||
1892 !(email_end
= strchr(sb
.buf
+ 82, '>')) ||
1893 email_end
[1] != ' ' ||
1894 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1895 !message
|| message
[0] != ' ' ||
1896 (message
[1] != '+' && message
[1] != '-') ||
1897 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1898 !isdigit(message
[4]) || !isdigit(message
[5]))
1899 continue; /* corrupt? */
1900 email_end
[1] = '\0';
1901 tz
= strtol(message
+ 1, NULL
, 10);
1902 if (message
[6] != '\t')
1906 ret
= fn(osha1
, nsha1
, sb
.buf
+ 82, timestamp
, tz
, message
,
1912 strbuf_release(&sb
);
1916 int for_each_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, void *cb_data
)
1918 return for_each_recent_reflog_ent(refname
, fn
, 0, cb_data
);
1921 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
1923 DIR *dir
= opendir(git_path("logs/%s", base
));
1928 int baselen
= strlen(base
);
1929 char *log
= xmalloc(baselen
+ 257);
1931 memcpy(log
, base
, baselen
);
1932 if (baselen
&& base
[baselen
-1] != '/')
1933 log
[baselen
++] = '/';
1935 while ((de
= readdir(dir
)) != NULL
) {
1939 if (de
->d_name
[0] == '.')
1941 namelen
= strlen(de
->d_name
);
1944 if (has_extension(de
->d_name
, ".lock"))
1946 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
1947 if (stat(git_path("logs/%s", log
), &st
) < 0)
1949 if (S_ISDIR(st
.st_mode
)) {
1950 retval
= do_for_each_reflog(log
, fn
, cb_data
);
1952 unsigned char sha1
[20];
1953 if (read_ref_full(log
, sha1
, 0, NULL
))
1954 retval
= error("bad ref for %s", log
);
1956 retval
= fn(log
, sha1
, 0, cb_data
);
1969 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
1971 return do_for_each_reflog("", fn
, cb_data
);
1974 int update_ref(const char *action
, const char *refname
,
1975 const unsigned char *sha1
, const unsigned char *oldval
,
1976 int flags
, enum action_on_err onerr
)
1978 static struct ref_lock
*lock
;
1979 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
1981 const char *str
= "Cannot lock the ref '%s'.";
1983 case MSG_ON_ERR
: error(str
, refname
); break;
1984 case DIE_ON_ERR
: die(str
, refname
); break;
1985 case QUIET_ON_ERR
: break;
1989 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
1990 const char *str
= "Cannot update the ref '%s'.";
1992 case MSG_ON_ERR
: error(str
, refname
); break;
1993 case DIE_ON_ERR
: die(str
, refname
); break;
1994 case QUIET_ON_ERR
: break;
2001 int ref_exists(const char *refname
)
2003 unsigned char sha1
[20];
2004 return !!resolve_ref(refname
, sha1
, 1, NULL
);
2007 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
2009 for ( ; list
; list
= list
->next
)
2010 if (!strcmp(list
->name
, name
))
2011 return (struct ref
*)list
;
2016 * generate a format suitable for scanf from a ref_rev_parse_rules
2017 * rule, that is replace the "%.*s" spec with a "%s" spec
2019 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
2023 spec
= strstr(rule
, "%.*s");
2024 if (!spec
|| strstr(spec
+ 4, "%.*s"))
2025 die("invalid rule in ref_rev_parse_rules: %s", rule
);
2027 /* copy all until spec */
2028 strncpy(scanf_fmt
, rule
, spec
- rule
);
2029 scanf_fmt
[spec
- rule
] = '\0';
2031 strcat(scanf_fmt
, "%s");
2032 /* copy remaining rule */
2033 strcat(scanf_fmt
, spec
+ 4);
2038 char *shorten_unambiguous_ref(const char *refname
, int strict
)
2041 static char **scanf_fmts
;
2042 static int nr_rules
;
2045 /* pre generate scanf formats from ref_rev_parse_rules[] */
2047 size_t total_len
= 0;
2049 /* the rule list is NULL terminated, count them first */
2050 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
2051 /* no +1 because strlen("%s") < strlen("%.*s") */
2052 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
2054 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
2057 for (i
= 0; i
< nr_rules
; i
++) {
2058 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
2060 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
2061 total_len
+= strlen(ref_rev_parse_rules
[i
]);
2065 /* bail out if there are no rules */
2067 return xstrdup(refname
);
2069 /* buffer for scanf result, at most refname must fit */
2070 short_name
= xstrdup(refname
);
2072 /* skip first rule, it will always match */
2073 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
2075 int rules_to_fail
= i
;
2078 if (1 != sscanf(refname
, scanf_fmts
[i
], short_name
))
2081 short_name_len
= strlen(short_name
);
2084 * in strict mode, all (except the matched one) rules
2085 * must fail to resolve to a valid non-ambiguous ref
2088 rules_to_fail
= nr_rules
;
2091 * check if the short name resolves to a valid ref,
2092 * but use only rules prior to the matched one
2094 for (j
= 0; j
< rules_to_fail
; j
++) {
2095 const char *rule
= ref_rev_parse_rules
[j
];
2096 char refname
[PATH_MAX
];
2098 /* skip matched rule */
2103 * the short name is ambiguous, if it resolves
2104 * (with this previous rule) to a valid ref
2105 * read_ref() returns 0 on success
2107 mksnpath(refname
, sizeof(refname
),
2108 rule
, short_name_len
, short_name
);
2109 if (ref_exists(refname
))
2114 * short name is non-ambiguous if all previous rules
2115 * haven't resolved to a valid ref
2117 if (j
== rules_to_fail
)
2122 return xstrdup(refname
);