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
];
22 * Entries with index 0 <= i < sorted are sorted by name. New
23 * entries are appended to the list unsorted, and are sorted
24 * only when required; thus we avoid the need to sort the list
25 * after the addition of every reference.
29 struct ref_entry
**refs
;
33 * Parse one line from a packed-refs file. Write the SHA1 to sha1.
34 * Return a pointer to the refname within the line (null-terminated),
35 * or NULL if there was a problem.
37 static const char *parse_ref_line(char *line
, unsigned char *sha1
)
40 * 42: the answer to everything.
42 * In this case, it happens to be the answer to
43 * 40 (length of sha1 hex representation)
44 * +1 (space in between hex and name)
45 * +1 (newline at the end of the line)
47 int len
= strlen(line
) - 42;
51 if (get_sha1_hex(line
, sha1
) < 0)
53 if (!isspace(line
[40]))
58 if (line
[len
] != '\n')
65 static struct ref_entry
*create_ref_entry(const char *refname
,
66 const unsigned char *sha1
, int flag
,
70 struct ref_entry
*ref
;
73 check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
|REFNAME_DOT_COMPONENT
))
74 die("Reference has invalid format: '%s'", refname
);
75 len
= strlen(refname
) + 1;
76 ref
= xmalloc(sizeof(struct ref_entry
) + len
);
77 hashcpy(ref
->sha1
, sha1
);
79 memcpy(ref
->name
, refname
, len
);
84 /* Add a ref_entry to the end of the ref_array (unsorted). */
85 static void add_ref(struct ref_array
*refs
, struct ref_entry
*ref
)
87 ALLOC_GROW(refs
->refs
, refs
->nr
+ 1, refs
->alloc
);
88 refs
->refs
[refs
->nr
++] = ref
;
91 static int ref_entry_cmp(const void *a
, const void *b
)
93 struct ref_entry
*one
= *(struct ref_entry
**)a
;
94 struct ref_entry
*two
= *(struct ref_entry
**)b
;
95 return strcmp(one
->name
, two
->name
);
99 * Emit a warning and return true iff ref1 and ref2 have the same name
100 * and the same sha1. Die if they have the same name but different
103 static int is_dup_ref(const struct ref_entry
*ref1
, const struct ref_entry
*ref2
)
105 if (!strcmp(ref1
->name
, ref2
->name
)) {
106 /* Duplicate name; make sure that the SHA1s match: */
107 if (hashcmp(ref1
->sha1
, ref2
->sha1
))
108 die("Duplicated ref, and SHA1s don't match: %s",
110 warning("Duplicated ref: %s", ref1
->name
);
118 * Sort the entries in array (if they are not already sorted).
120 static void sort_ref_array(struct ref_array
*array
)
125 * This check also prevents passing a zero-length array to qsort(),
126 * which is a problem on some platforms.
128 if (array
->sorted
== array
->nr
)
131 qsort(array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
133 /* Remove any duplicates from the ref_array */
135 for (j
= 1; j
< array
->nr
; j
++) {
136 if (is_dup_ref(array
->refs
[i
], array
->refs
[j
])) {
137 free(array
->refs
[j
]);
140 array
->refs
[++i
] = array
->refs
[j
];
142 array
->sorted
= array
->nr
= i
+ 1;
145 static struct ref_entry
*search_ref_array(struct ref_array
*array
, const char *refname
)
147 struct ref_entry
*e
, **r
;
155 sort_ref_array(array
);
156 len
= strlen(refname
) + 1;
157 e
= xmalloc(sizeof(struct ref_entry
) + len
);
158 memcpy(e
->name
, refname
, len
);
160 r
= bsearch(&e
, array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
171 * Future: need to be in "struct repository"
172 * when doing a full libification.
174 static struct ref_cache
{
175 struct ref_cache
*next
;
178 struct ref_array loose
;
179 struct ref_array packed
;
180 /* The submodule name, or "" for the main repo. */
181 char name
[FLEX_ARRAY
];
184 static struct ref_entry
*current_ref
;
187 * Never call sort_ref_array() on the extra_refs, because it is
188 * allowed to contain entries with duplicate names.
190 static struct ref_array extra_refs
;
192 static void clear_ref_array(struct ref_array
*array
)
195 for (i
= 0; i
< array
->nr
; i
++)
196 free(array
->refs
[i
]);
198 array
->sorted
= array
->nr
= array
->alloc
= 0;
202 static void clear_packed_ref_cache(struct ref_cache
*refs
)
204 if (refs
->did_packed
)
205 clear_ref_array(&refs
->packed
);
206 refs
->did_packed
= 0;
209 static void clear_loose_ref_cache(struct ref_cache
*refs
)
212 clear_ref_array(&refs
->loose
);
216 static struct ref_cache
*create_ref_cache(const char *submodule
)
219 struct ref_cache
*refs
;
222 len
= strlen(submodule
) + 1;
223 refs
= xcalloc(1, sizeof(struct ref_cache
) + len
);
224 memcpy(refs
->name
, submodule
, len
);
229 * Return a pointer to a ref_cache for the specified submodule. For
230 * the main repository, use submodule==NULL. The returned structure
231 * will be allocated and initialized but not necessarily populated; it
232 * should not be freed.
234 static struct ref_cache
*get_ref_cache(const char *submodule
)
236 struct ref_cache
*refs
= ref_cache
;
240 if (!strcmp(submodule
, refs
->name
))
245 refs
= create_ref_cache(submodule
);
246 refs
->next
= ref_cache
;
251 void invalidate_ref_cache(const char *submodule
)
253 struct ref_cache
*refs
= get_ref_cache(submodule
);
254 clear_packed_ref_cache(refs
);
255 clear_loose_ref_cache(refs
);
258 static void read_packed_refs(FILE *f
, struct ref_array
*array
)
260 struct ref_entry
*last
= NULL
;
261 char refline
[PATH_MAX
];
262 int flag
= REF_ISPACKED
;
264 while (fgets(refline
, sizeof(refline
), f
)) {
265 unsigned char sha1
[20];
267 static const char header
[] = "# pack-refs with:";
269 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
270 const char *traits
= refline
+ sizeof(header
) - 1;
271 if (strstr(traits
, " peeled "))
272 flag
|= REF_KNOWS_PEELED
;
273 /* perhaps other traits later as well */
277 refname
= parse_ref_line(refline
, sha1
);
279 last
= create_ref_entry(refname
, sha1
, flag
, 1);
280 add_ref(array
, last
);
285 strlen(refline
) == 42 &&
286 refline
[41] == '\n' &&
287 !get_sha1_hex(refline
+ 1, sha1
))
288 hashcpy(last
->peeled
, sha1
);
292 void add_extra_ref(const char *refname
, const unsigned char *sha1
, int flag
)
294 add_ref(&extra_refs
, create_ref_entry(refname
, sha1
, flag
, 0));
297 void clear_extra_refs(void)
299 clear_ref_array(&extra_refs
);
302 static struct ref_array
*get_packed_refs(struct ref_cache
*refs
)
304 if (!refs
->did_packed
) {
305 const char *packed_refs_file
;
309 packed_refs_file
= git_path_submodule(refs
->name
, "packed-refs");
311 packed_refs_file
= git_path("packed-refs");
312 f
= fopen(packed_refs_file
, "r");
314 read_packed_refs(f
, &refs
->packed
);
317 refs
->did_packed
= 1;
319 return &refs
->packed
;
322 static void get_ref_dir(struct ref_cache
*refs
, const char *base
,
323 struct ref_array
*array
)
329 path
= git_path_submodule(refs
->name
, "%s", base
);
331 path
= git_path("%s", base
);
338 int baselen
= strlen(base
);
339 char *refname
= xmalloc(baselen
+ 257);
341 memcpy(refname
, base
, baselen
);
342 if (baselen
&& base
[baselen
-1] != '/')
343 refname
[baselen
++] = '/';
345 while ((de
= readdir(dir
)) != NULL
) {
346 unsigned char sha1
[20];
352 if (de
->d_name
[0] == '.')
354 namelen
= strlen(de
->d_name
);
357 if (has_extension(de
->d_name
, ".lock"))
359 memcpy(refname
+ baselen
, de
->d_name
, namelen
+1);
361 ? git_path_submodule(refs
->name
, "%s", refname
)
362 : git_path("%s", refname
);
363 if (stat(refdir
, &st
) < 0)
365 if (S_ISDIR(st
.st_mode
)) {
366 get_ref_dir(refs
, refname
, array
);
372 if (resolve_gitlink_ref(refs
->name
, refname
, sha1
) < 0) {
374 flag
|= REF_ISBROKEN
;
376 } else if (read_ref_full(refname
, sha1
, 1, &flag
)) {
378 flag
|= REF_ISBROKEN
;
380 add_ref(array
, create_ref_entry(refname
, sha1
, flag
, 1));
387 struct warn_if_dangling_data
{
393 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
394 int flags
, void *cb_data
)
396 struct warn_if_dangling_data
*d
= cb_data
;
397 const char *resolves_to
;
398 unsigned char junk
[20];
400 if (!(flags
& REF_ISSYMREF
))
403 resolves_to
= resolve_ref_unsafe(refname
, junk
, 0, NULL
);
404 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
407 fprintf(d
->fp
, d
->msg_fmt
, refname
);
411 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
413 struct warn_if_dangling_data data
;
416 data
.refname
= refname
;
417 data
.msg_fmt
= msg_fmt
;
418 for_each_rawref(warn_if_dangling_symref
, &data
);
421 static struct ref_array
*get_loose_refs(struct ref_cache
*refs
)
423 if (!refs
->did_loose
) {
424 get_ref_dir(refs
, "refs", &refs
->loose
);
430 /* We allow "recursive" symbolic refs. Only within reason, though */
432 #define MAXREFLEN (1024)
435 * Called by resolve_gitlink_ref_recursive() after it failed to read
436 * from the loose refs in ref_cache refs. Find <refname> in the
437 * packed-refs file for the submodule.
439 static int resolve_gitlink_packed_ref(struct ref_cache
*refs
,
440 const char *refname
, unsigned char *sha1
)
442 struct ref_entry
*ref
;
443 struct ref_array
*array
= get_packed_refs(refs
);
445 ref
= search_ref_array(array
, refname
);
449 memcpy(sha1
, ref
->sha1
, 20);
453 static int resolve_gitlink_ref_recursive(struct ref_cache
*refs
,
454 const char *refname
, unsigned char *sha1
,
458 char buffer
[128], *p
;
461 if (recursion
> MAXDEPTH
|| strlen(refname
) > MAXREFLEN
)
464 ? git_path_submodule(refs
->name
, "%s", refname
)
465 : git_path("%s", refname
);
466 fd
= open(path
, O_RDONLY
);
468 return resolve_gitlink_packed_ref(refs
, refname
, sha1
);
470 len
= read(fd
, buffer
, sizeof(buffer
)-1);
474 while (len
&& isspace(buffer
[len
-1]))
478 /* Was it a detached head or an old-fashioned symlink? */
479 if (!get_sha1_hex(buffer
, sha1
))
483 if (strncmp(buffer
, "ref:", 4))
489 return resolve_gitlink_ref_recursive(refs
, p
, sha1
, recursion
+1);
492 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *sha1
)
494 int len
= strlen(path
), retval
;
496 struct ref_cache
*refs
;
498 while (len
&& path
[len
-1] == '/')
502 submodule
= xstrndup(path
, len
);
503 refs
= get_ref_cache(submodule
);
506 retval
= resolve_gitlink_ref_recursive(refs
, refname
, sha1
, 0);
511 * Try to read ref from the packed references. On success, set sha1
512 * and return 0; otherwise, return -1.
514 static int get_packed_ref(const char *refname
, unsigned char *sha1
)
516 struct ref_array
*packed
= get_packed_refs(get_ref_cache(NULL
));
517 struct ref_entry
*entry
= search_ref_array(packed
, refname
);
519 hashcpy(sha1
, entry
->sha1
);
525 const char *resolve_ref_unsafe(const char *refname
, unsigned char *sha1
, int reading
, int *flag
)
527 int depth
= MAXDEPTH
;
530 static char refname_buffer
[256];
535 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
547 git_snpath(path
, sizeof(path
), "%s", refname
);
549 if (lstat(path
, &st
) < 0) {
553 * The loose reference file does not exist;
554 * check for a packed reference.
556 if (!get_packed_ref(refname
, sha1
)) {
558 *flag
|= REF_ISPACKED
;
561 /* The reference is not a packed reference, either. */
570 /* Follow "normalized" - ie "refs/.." symlinks by hand */
571 if (S_ISLNK(st
.st_mode
)) {
572 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
576 if (!prefixcmp(buffer
, "refs/") &&
577 !check_refname_format(buffer
, 0)) {
578 strcpy(refname_buffer
, buffer
);
579 refname
= refname_buffer
;
581 *flag
|= REF_ISSYMREF
;
586 /* Is it a directory? */
587 if (S_ISDIR(st
.st_mode
)) {
593 * Anything else, just open it and try to use it as
596 fd
= open(path
, O_RDONLY
);
599 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
603 while (len
&& isspace(buffer
[len
-1]))
608 * Is it a symbolic ref?
610 if (prefixcmp(buffer
, "ref:"))
613 *flag
|= REF_ISSYMREF
;
615 while (isspace(*buf
))
617 if (check_refname_format(buf
, REFNAME_ALLOW_ONELEVEL
)) {
619 *flag
|= REF_ISBROKEN
;
622 refname
= strcpy(refname_buffer
, buf
);
624 /* Please note that FETCH_HEAD has a second line containing other data. */
625 if (get_sha1_hex(buffer
, sha1
) || (buffer
[40] != '\0' && !isspace(buffer
[40]))) {
627 *flag
|= REF_ISBROKEN
;
633 char *resolve_refdup(const char *ref
, unsigned char *sha1
, int reading
, int *flag
)
635 const char *ret
= resolve_ref_unsafe(ref
, sha1
, reading
, flag
);
636 return ret
? xstrdup(ret
) : NULL
;
639 /* The argument to filter_refs */
646 int read_ref_full(const char *refname
, unsigned char *sha1
, int reading
, int *flags
)
648 if (resolve_ref_unsafe(refname
, sha1
, reading
, flags
))
653 int read_ref(const char *refname
, unsigned char *sha1
)
655 return read_ref_full(refname
, sha1
, 1, NULL
);
658 #define DO_FOR_EACH_INCLUDE_BROKEN 01
659 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
660 int flags
, void *cb_data
, struct ref_entry
*entry
)
662 if (prefixcmp(entry
->name
, base
))
665 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
666 if (entry
->flag
& REF_ISBROKEN
)
667 return 0; /* ignore broken refs e.g. dangling symref */
668 if (!has_sha1_file(entry
->sha1
)) {
669 error("%s does not point to a valid object!", entry
->name
);
674 return fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
677 static int filter_refs(const char *refname
, const unsigned char *sha1
, int flags
,
680 struct ref_filter
*filter
= (struct ref_filter
*)data
;
681 if (fnmatch(filter
->pattern
, refname
, 0))
683 return filter
->fn(refname
, sha1
, flags
, filter
->cb_data
);
686 int peel_ref(const char *refname
, unsigned char *sha1
)
689 unsigned char base
[20];
692 if (current_ref
&& (current_ref
->name
== refname
693 || !strcmp(current_ref
->name
, refname
))) {
694 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
695 hashcpy(sha1
, current_ref
->peeled
);
698 hashcpy(base
, current_ref
->sha1
);
702 if (read_ref_full(refname
, base
, 1, &flag
))
705 if ((flag
& REF_ISPACKED
)) {
706 struct ref_array
*array
= get_packed_refs(get_ref_cache(NULL
));
707 struct ref_entry
*r
= search_ref_array(array
, refname
);
709 if (r
!= NULL
&& r
->flag
& REF_KNOWS_PEELED
) {
710 hashcpy(sha1
, r
->peeled
);
716 o
= parse_object(base
);
717 if (o
&& o
->type
== OBJ_TAG
) {
718 o
= deref_tag(o
, refname
, 0);
720 hashcpy(sha1
, o
->sha1
);
727 static int do_for_each_ref(const char *submodule
, const char *base
, each_ref_fn fn
,
728 int trim
, int flags
, void *cb_data
)
730 int retval
= 0, i
, p
= 0, l
= 0;
731 struct ref_cache
*refs
= get_ref_cache(submodule
);
732 struct ref_array
*packed
= get_packed_refs(refs
);
733 struct ref_array
*loose
= get_loose_refs(refs
);
735 struct ref_array
*extra
= &extra_refs
;
737 for (i
= 0; i
< extra
->nr
; i
++)
738 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, extra
->refs
[i
]);
740 sort_ref_array(packed
);
741 sort_ref_array(loose
);
742 while (p
< packed
->nr
&& l
< loose
->nr
) {
743 struct ref_entry
*entry
;
744 int cmp
= strcmp(packed
->refs
[p
]->name
, loose
->refs
[l
]->name
);
750 entry
= loose
->refs
[l
++];
752 entry
= packed
->refs
[p
++];
754 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, entry
);
764 for (; p
< packed
->nr
; p
++) {
765 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, packed
->refs
[p
]);
776 static int do_head_ref(const char *submodule
, each_ref_fn fn
, void *cb_data
)
778 unsigned char sha1
[20];
782 if (resolve_gitlink_ref(submodule
, "HEAD", sha1
) == 0)
783 return fn("HEAD", sha1
, 0, cb_data
);
788 if (!read_ref_full("HEAD", sha1
, 1, &flag
))
789 return fn("HEAD", sha1
, flag
, cb_data
);
794 int head_ref(each_ref_fn fn
, void *cb_data
)
796 return do_head_ref(NULL
, fn
, cb_data
);
799 int head_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
801 return do_head_ref(submodule
, fn
, cb_data
);
804 int for_each_ref(each_ref_fn fn
, void *cb_data
)
806 return do_for_each_ref(NULL
, "", fn
, 0, 0, cb_data
);
809 int for_each_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
811 return do_for_each_ref(submodule
, "", fn
, 0, 0, cb_data
);
814 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
816 return do_for_each_ref(NULL
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
819 int for_each_ref_in_submodule(const char *submodule
, const char *prefix
,
820 each_ref_fn fn
, void *cb_data
)
822 return do_for_each_ref(submodule
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
825 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
827 return for_each_ref_in("refs/tags/", fn
, cb_data
);
830 int for_each_tag_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
832 return for_each_ref_in_submodule(submodule
, "refs/tags/", fn
, cb_data
);
835 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
837 return for_each_ref_in("refs/heads/", fn
, cb_data
);
840 int for_each_branch_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
842 return for_each_ref_in_submodule(submodule
, "refs/heads/", fn
, cb_data
);
845 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
847 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
850 int for_each_remote_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
852 return for_each_ref_in_submodule(submodule
, "refs/remotes/", fn
, cb_data
);
855 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
857 return do_for_each_ref(NULL
, "refs/replace/", fn
, 13, 0, cb_data
);
860 int head_ref_namespaced(each_ref_fn fn
, void *cb_data
)
862 struct strbuf buf
= STRBUF_INIT
;
864 unsigned char sha1
[20];
867 strbuf_addf(&buf
, "%sHEAD", get_git_namespace());
868 if (!read_ref_full(buf
.buf
, sha1
, 1, &flag
))
869 ret
= fn(buf
.buf
, sha1
, flag
, cb_data
);
870 strbuf_release(&buf
);
875 int for_each_namespaced_ref(each_ref_fn fn
, void *cb_data
)
877 struct strbuf buf
= STRBUF_INIT
;
879 strbuf_addf(&buf
, "%srefs/", get_git_namespace());
880 ret
= do_for_each_ref(NULL
, buf
.buf
, fn
, 0, 0, cb_data
);
881 strbuf_release(&buf
);
885 int for_each_glob_ref_in(each_ref_fn fn
, const char *pattern
,
886 const char *prefix
, void *cb_data
)
888 struct strbuf real_pattern
= STRBUF_INIT
;
889 struct ref_filter filter
;
892 if (!prefix
&& prefixcmp(pattern
, "refs/"))
893 strbuf_addstr(&real_pattern
, "refs/");
895 strbuf_addstr(&real_pattern
, prefix
);
896 strbuf_addstr(&real_pattern
, pattern
);
898 if (!has_glob_specials(pattern
)) {
899 /* Append implied '/' '*' if not present. */
900 if (real_pattern
.buf
[real_pattern
.len
- 1] != '/')
901 strbuf_addch(&real_pattern
, '/');
902 /* No need to check for '*', there is none. */
903 strbuf_addch(&real_pattern
, '*');
906 filter
.pattern
= real_pattern
.buf
;
908 filter
.cb_data
= cb_data
;
909 ret
= for_each_ref(filter_refs
, &filter
);
911 strbuf_release(&real_pattern
);
915 int for_each_glob_ref(each_ref_fn fn
, const char *pattern
, void *cb_data
)
917 return for_each_glob_ref_in(fn
, pattern
, NULL
, cb_data
);
920 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
922 return do_for_each_ref(NULL
, "", fn
, 0,
923 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
927 * Make sure "ref" is something reasonable to have under ".git/refs/";
928 * We do not like it if:
930 * - any path component of it begins with ".", or
931 * - it has double dots "..", or
932 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
933 * - it ends with a "/".
934 * - it ends with ".lock"
935 * - it contains a "\" (backslash)
938 /* Return true iff ch is not allowed in reference names. */
939 static inline int bad_ref_char(int ch
)
941 if (((unsigned) ch
) <= ' ' || ch
== 0x7f ||
942 ch
== '~' || ch
== '^' || ch
== ':' || ch
== '\\')
944 /* 2.13 Pattern Matching Notation */
945 if (ch
== '*' || ch
== '?' || ch
== '[') /* Unsupported */
951 * Try to read one refname component from the front of refname. Return
952 * the length of the component found, or -1 if the component is not
955 static int check_refname_component(const char *refname
, int flags
)
960 for (cp
= refname
; ; cp
++) {
962 if (ch
== '\0' || ch
== '/')
964 if (bad_ref_char(ch
))
965 return -1; /* Illegal character in refname. */
966 if (last
== '.' && ch
== '.')
967 return -1; /* Refname contains "..". */
968 if (last
== '@' && ch
== '{')
969 return -1; /* Refname contains "@{". */
973 return -1; /* Component has zero length. */
974 if (refname
[0] == '.') {
975 if (!(flags
& REFNAME_DOT_COMPONENT
))
976 return -1; /* Component starts with '.'. */
978 * Even if leading dots are allowed, don't allow "."
979 * as a component (".." is prevented by a rule above).
981 if (refname
[1] == '\0')
982 return -1; /* Component equals ".". */
984 if (cp
- refname
>= 5 && !memcmp(cp
- 5, ".lock", 5))
985 return -1; /* Refname ends with ".lock". */
989 int check_refname_format(const char *refname
, int flags
)
991 int component_len
, component_count
= 0;
994 /* We are at the start of a path component. */
995 component_len
= check_refname_component(refname
, flags
);
996 if (component_len
< 0) {
997 if ((flags
& REFNAME_REFSPEC_PATTERN
) &&
999 (refname
[1] == '\0' || refname
[1] == '/')) {
1000 /* Accept one wildcard as a full refname component. */
1001 flags
&= ~REFNAME_REFSPEC_PATTERN
;
1008 if (refname
[component_len
] == '\0')
1010 /* Skip to next component. */
1011 refname
+= component_len
+ 1;
1014 if (refname
[component_len
- 1] == '.')
1015 return -1; /* Refname ends with '.'. */
1016 if (!(flags
& REFNAME_ALLOW_ONELEVEL
) && component_count
< 2)
1017 return -1; /* Refname has only one component. */
1021 const char *prettify_refname(const char *name
)
1024 !prefixcmp(name
, "refs/heads/") ? 11 :
1025 !prefixcmp(name
, "refs/tags/") ? 10 :
1026 !prefixcmp(name
, "refs/remotes/") ? 13 :
1030 const char *ref_rev_parse_rules
[] = {
1035 "refs/remotes/%.*s",
1036 "refs/remotes/%.*s/HEAD",
1040 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
1043 const int abbrev_name_len
= strlen(abbrev_name
);
1045 for (p
= rules
; *p
; p
++) {
1046 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
1054 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
1055 const unsigned char *old_sha1
, int mustexist
)
1057 if (read_ref_full(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
1058 error("Can't verify ref %s", lock
->ref_name
);
1062 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
1063 error("Ref %s is at %s but expected %s", lock
->ref_name
,
1064 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
1071 static int remove_empty_directories(const char *file
)
1073 /* we want to create a file but there is a directory there;
1074 * if that is an empty directory (or a directory that contains
1075 * only empty directories), remove them.
1080 strbuf_init(&path
, 20);
1081 strbuf_addstr(&path
, file
);
1083 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
1085 strbuf_release(&path
);
1091 * Return true iff a reference named refname could be created without
1092 * conflicting with the name of an existing reference. If oldrefname
1093 * is non-NULL, ignore potential conflicts with oldrefname (e.g.,
1094 * because oldrefname is scheduled for deletion in the same
1097 static int is_refname_available(const char *refname
, const char *oldrefname
,
1098 struct ref_array
*array
)
1100 int i
, namlen
= strlen(refname
); /* e.g. 'foo/bar' */
1101 for (i
= 0; i
< array
->nr
; i
++ ) {
1102 struct ref_entry
*entry
= array
->refs
[i
];
1103 /* entry->name could be 'foo' or 'foo/bar/baz' */
1104 if (!oldrefname
|| strcmp(oldrefname
, entry
->name
)) {
1105 int len
= strlen(entry
->name
);
1106 int cmplen
= (namlen
< len
) ? namlen
: len
;
1107 const char *lead
= (namlen
< len
) ? entry
->name
: refname
;
1108 if (!strncmp(refname
, entry
->name
, cmplen
) &&
1109 lead
[cmplen
] == '/') {
1110 error("'%s' exists; cannot create '%s'",
1111 entry
->name
, refname
);
1120 * *string and *len will only be substituted, and *string returned (for
1121 * later free()ing) if the string passed in is a magic short-hand form
1124 static char *substitute_branch_name(const char **string
, int *len
)
1126 struct strbuf buf
= STRBUF_INIT
;
1127 int ret
= interpret_branch_name(*string
, &buf
);
1131 *string
= strbuf_detach(&buf
, &size
);
1133 return (char *)*string
;
1139 int dwim_ref(const char *str
, int len
, unsigned char *sha1
, char **ref
)
1141 char *last_branch
= substitute_branch_name(&str
, &len
);
1146 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1147 char fullref
[PATH_MAX
];
1148 unsigned char sha1_from_ref
[20];
1149 unsigned char *this_result
;
1152 this_result
= refs_found
? sha1_from_ref
: sha1
;
1153 mksnpath(fullref
, sizeof(fullref
), *p
, len
, str
);
1154 r
= resolve_ref_unsafe(fullref
, this_result
, 1, &flag
);
1158 if (!warn_ambiguous_refs
)
1160 } else if ((flag
& REF_ISSYMREF
) && strcmp(fullref
, "HEAD")) {
1161 warning("ignoring dangling symref %s.", fullref
);
1162 } else if ((flag
& REF_ISBROKEN
) && strchr(fullref
, '/')) {
1163 warning("ignoring broken ref %s.", fullref
);
1170 int dwim_log(const char *str
, int len
, unsigned char *sha1
, char **log
)
1172 char *last_branch
= substitute_branch_name(&str
, &len
);
1177 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1179 unsigned char hash
[20];
1180 char path
[PATH_MAX
];
1181 const char *ref
, *it
;
1183 mksnpath(path
, sizeof(path
), *p
, len
, str
);
1184 ref
= resolve_ref_unsafe(path
, hash
, 1, NULL
);
1187 if (!stat(git_path("logs/%s", path
), &st
) &&
1188 S_ISREG(st
.st_mode
))
1190 else if (strcmp(ref
, path
) &&
1191 !stat(git_path("logs/%s", ref
), &st
) &&
1192 S_ISREG(st
.st_mode
))
1196 if (!logs_found
++) {
1198 hashcpy(sha1
, hash
);
1200 if (!warn_ambiguous_refs
)
1207 static struct ref_lock
*lock_ref_sha1_basic(const char *refname
,
1208 const unsigned char *old_sha1
,
1209 int flags
, int *type_p
)
1212 const char *orig_refname
= refname
;
1213 struct ref_lock
*lock
;
1216 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1219 lock
= xcalloc(1, sizeof(struct ref_lock
));
1222 refname
= resolve_ref_unsafe(refname
, lock
->old_sha1
, mustexist
, &type
);
1223 if (!refname
&& errno
== EISDIR
) {
1224 /* we are trying to lock foo but we used to
1225 * have foo/bar which now does not exist;
1226 * it is normal for the empty directory 'foo'
1229 ref_file
= git_path("%s", orig_refname
);
1230 if (remove_empty_directories(ref_file
)) {
1232 error("there are still refs under '%s'", orig_refname
);
1235 refname
= resolve_ref_unsafe(orig_refname
, lock
->old_sha1
, mustexist
, &type
);
1241 error("unable to resolve reference %s: %s",
1242 orig_refname
, strerror(errno
));
1245 missing
= is_null_sha1(lock
->old_sha1
);
1246 /* When the ref did not exist and we are creating it,
1247 * make sure there is no existing ref that is packed
1248 * whose name begins with our refname, nor a ref whose
1249 * name is a proper prefix of our refname.
1252 !is_refname_available(refname
, NULL
, get_packed_refs(get_ref_cache(NULL
)))) {
1253 last_errno
= ENOTDIR
;
1257 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1259 lflags
= LOCK_DIE_ON_ERROR
;
1260 if (flags
& REF_NODEREF
) {
1261 refname
= orig_refname
;
1262 lflags
|= LOCK_NODEREF
;
1264 lock
->ref_name
= xstrdup(refname
);
1265 lock
->orig_ref_name
= xstrdup(orig_refname
);
1266 ref_file
= git_path("%s", refname
);
1268 lock
->force_write
= 1;
1269 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
1270 lock
->force_write
= 1;
1272 if (safe_create_leading_directories(ref_file
)) {
1274 error("unable to create directory for %s", ref_file
);
1278 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
1279 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
1287 struct ref_lock
*lock_ref_sha1(const char *refname
, const unsigned char *old_sha1
)
1289 char refpath
[PATH_MAX
];
1290 if (check_refname_format(refname
, 0))
1292 strcpy(refpath
, mkpath("refs/%s", refname
));
1293 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
1296 struct ref_lock
*lock_any_ref_for_update(const char *refname
,
1297 const unsigned char *old_sha1
, int flags
)
1299 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
1301 return lock_ref_sha1_basic(refname
, old_sha1
, flags
, NULL
);
1304 static struct lock_file packlock
;
1306 static int repack_without_ref(const char *refname
)
1308 struct ref_array
*packed
;
1311 packed
= get_packed_refs(get_ref_cache(NULL
));
1312 if (search_ref_array(packed
, refname
) == NULL
)
1314 fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
1316 unable_to_lock_error(git_path("packed-refs"), errno
);
1317 return error("cannot delete '%s' from packed refs", refname
);
1320 for (i
= 0; i
< packed
->nr
; i
++) {
1321 char line
[PATH_MAX
+ 100];
1323 struct ref_entry
*ref
= packed
->refs
[i
];
1325 if (!strcmp(refname
, ref
->name
))
1327 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1328 sha1_to_hex(ref
->sha1
), ref
->name
);
1329 /* this should not happen but just being defensive */
1330 if (len
> sizeof(line
))
1331 die("too long a refname '%s'", ref
->name
);
1332 write_or_die(fd
, line
, len
);
1334 return commit_lock_file(&packlock
);
1337 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1339 struct ref_lock
*lock
;
1340 int err
, i
= 0, ret
= 0, flag
= 0;
1342 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1345 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1349 if (!(delopt
& REF_NODEREF
)) {
1350 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1351 lock
->lk
->filename
[i
] = 0;
1352 path
= lock
->lk
->filename
;
1354 path
= git_path("%s", refname
);
1356 err
= unlink_or_warn(path
);
1357 if (err
&& errno
!= ENOENT
)
1360 if (!(delopt
& REF_NODEREF
))
1361 lock
->lk
->filename
[i
] = '.';
1363 /* removing the loose one could have resurrected an earlier
1364 * packed one. Also, if it was not loose we need to repack
1367 ret
|= repack_without_ref(refname
);
1369 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1370 invalidate_ref_cache(NULL
);
1376 * People using contrib's git-new-workdir have .git/logs/refs ->
1377 * /some/other/path/.git/logs/refs, and that may live on another device.
1379 * IOW, to avoid cross device rename errors, the temporary renamed log must
1380 * live into logs/refs.
1382 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1384 int rename_ref(const char *oldrefname
, const char *newrefname
, const char *logmsg
)
1386 unsigned char sha1
[20], orig_sha1
[20];
1387 int flag
= 0, logmoved
= 0;
1388 struct ref_lock
*lock
;
1389 struct stat loginfo
;
1390 int log
= !lstat(git_path("logs/%s", oldrefname
), &loginfo
);
1391 const char *symref
= NULL
;
1392 struct ref_cache
*refs
= get_ref_cache(NULL
);
1394 if (log
&& S_ISLNK(loginfo
.st_mode
))
1395 return error("reflog for %s is a symlink", oldrefname
);
1397 symref
= resolve_ref_unsafe(oldrefname
, orig_sha1
, 1, &flag
);
1398 if (flag
& REF_ISSYMREF
)
1399 return error("refname %s is a symbolic ref, renaming it is not supported",
1402 return error("refname %s not found", oldrefname
);
1404 if (!is_refname_available(newrefname
, oldrefname
, get_packed_refs(refs
)))
1407 if (!is_refname_available(newrefname
, oldrefname
, get_loose_refs(refs
)))
1410 if (log
&& rename(git_path("logs/%s", oldrefname
), git_path(TMP_RENAMED_LOG
)))
1411 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG
": %s",
1412 oldrefname
, strerror(errno
));
1414 if (delete_ref(oldrefname
, orig_sha1
, REF_NODEREF
)) {
1415 error("unable to delete old %s", oldrefname
);
1419 if (!read_ref_full(newrefname
, sha1
, 1, &flag
) &&
1420 delete_ref(newrefname
, sha1
, REF_NODEREF
)) {
1421 if (errno
==EISDIR
) {
1422 if (remove_empty_directories(git_path("%s", newrefname
))) {
1423 error("Directory not empty: %s", newrefname
);
1427 error("unable to delete existing %s", newrefname
);
1432 if (log
&& safe_create_leading_directories(git_path("logs/%s", newrefname
))) {
1433 error("unable to create directory for %s", newrefname
);
1438 if (log
&& rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", newrefname
))) {
1439 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1441 * rename(a, b) when b is an existing
1442 * directory ought to result in ISDIR, but
1443 * Solaris 5.8 gives ENOTDIR. Sheesh.
1445 if (remove_empty_directories(git_path("logs/%s", newrefname
))) {
1446 error("Directory not empty: logs/%s", newrefname
);
1451 error("unable to move logfile "TMP_RENAMED_LOG
" to logs/%s: %s",
1452 newrefname
, strerror(errno
));
1458 lock
= lock_ref_sha1_basic(newrefname
, NULL
, 0, NULL
);
1460 error("unable to lock %s for update", newrefname
);
1463 lock
->force_write
= 1;
1464 hashcpy(lock
->old_sha1
, orig_sha1
);
1465 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1466 error("unable to write current sha1 into %s", newrefname
);
1473 lock
= lock_ref_sha1_basic(oldrefname
, NULL
, 0, NULL
);
1475 error("unable to lock %s for rollback", oldrefname
);
1479 lock
->force_write
= 1;
1480 flag
= log_all_ref_updates
;
1481 log_all_ref_updates
= 0;
1482 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1483 error("unable to write current sha1 into %s", oldrefname
);
1484 log_all_ref_updates
= flag
;
1487 if (logmoved
&& rename(git_path("logs/%s", newrefname
), git_path("logs/%s", oldrefname
)))
1488 error("unable to restore logfile %s from %s: %s",
1489 oldrefname
, newrefname
, strerror(errno
));
1490 if (!logmoved
&& log
&&
1491 rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", oldrefname
)))
1492 error("unable to restore logfile %s from "TMP_RENAMED_LOG
": %s",
1493 oldrefname
, strerror(errno
));
1498 int close_ref(struct ref_lock
*lock
)
1500 if (close_lock_file(lock
->lk
))
1506 int commit_ref(struct ref_lock
*lock
)
1508 if (commit_lock_file(lock
->lk
))
1514 void unlock_ref(struct ref_lock
*lock
)
1516 /* Do not free lock->lk -- atexit() still looks at them */
1518 rollback_lock_file(lock
->lk
);
1519 free(lock
->ref_name
);
1520 free(lock
->orig_ref_name
);
1525 * copy the reflog message msg to buf, which has been allocated sufficiently
1526 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1527 * because reflog file is one line per entry.
1529 static int copy_msg(char *buf
, const char *msg
)
1536 while ((c
= *msg
++)) {
1537 if (wasspace
&& isspace(c
))
1539 wasspace
= isspace(c
);
1544 while (buf
< cp
&& isspace(cp
[-1]))
1550 int log_ref_setup(const char *refname
, char *logfile
, int bufsize
)
1552 int logfd
, oflags
= O_APPEND
| O_WRONLY
;
1554 git_snpath(logfile
, bufsize
, "logs/%s", refname
);
1555 if (log_all_ref_updates
&&
1556 (!prefixcmp(refname
, "refs/heads/") ||
1557 !prefixcmp(refname
, "refs/remotes/") ||
1558 !prefixcmp(refname
, "refs/notes/") ||
1559 !strcmp(refname
, "HEAD"))) {
1560 if (safe_create_leading_directories(logfile
) < 0)
1561 return error("unable to create directory for %s",
1566 logfd
= open(logfile
, oflags
, 0666);
1568 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1571 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1572 if (remove_empty_directories(logfile
)) {
1573 return error("There are still logs under '%s'",
1576 logfd
= open(logfile
, oflags
, 0666);
1580 return error("Unable to append to %s: %s",
1581 logfile
, strerror(errno
));
1584 adjust_shared_perm(logfile
);
1589 static int log_ref_write(const char *refname
, const unsigned char *old_sha1
,
1590 const unsigned char *new_sha1
, const char *msg
)
1592 int logfd
, result
, written
, oflags
= O_APPEND
| O_WRONLY
;
1593 unsigned maxlen
, len
;
1595 char log_file
[PATH_MAX
];
1597 const char *committer
;
1599 if (log_all_ref_updates
< 0)
1600 log_all_ref_updates
= !is_bare_repository();
1602 result
= log_ref_setup(refname
, log_file
, sizeof(log_file
));
1606 logfd
= open(log_file
, oflags
);
1609 msglen
= msg
? strlen(msg
) : 0;
1610 committer
= git_committer_info(0);
1611 maxlen
= strlen(committer
) + msglen
+ 100;
1612 logrec
= xmalloc(maxlen
);
1613 len
= sprintf(logrec
, "%s %s %s\n",
1614 sha1_to_hex(old_sha1
),
1615 sha1_to_hex(new_sha1
),
1618 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1619 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1621 if (close(logfd
) != 0 || written
!= len
)
1622 return error("Unable to append to %s", log_file
);
1626 static int is_branch(const char *refname
)
1628 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1631 int write_ref_sha1(struct ref_lock
*lock
,
1632 const unsigned char *sha1
, const char *logmsg
)
1634 static char term
= '\n';
1639 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1643 o
= parse_object(sha1
);
1645 error("Trying to write ref %s with nonexistent object %s",
1646 lock
->ref_name
, sha1_to_hex(sha1
));
1650 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1651 error("Trying to write non-commit object %s to branch %s",
1652 sha1_to_hex(sha1
), lock
->ref_name
);
1656 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1657 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1658 || close_ref(lock
) < 0) {
1659 error("Couldn't write %s", lock
->lk
->filename
);
1663 clear_loose_ref_cache(get_ref_cache(NULL
));
1664 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1665 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1666 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1670 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1672 * Special hack: If a branch is updated directly and HEAD
1673 * points to it (may happen on the remote side of a push
1674 * for example) then logically the HEAD reflog should be
1676 * A generic solution implies reverse symref information,
1677 * but finding all symrefs pointing to the given branch
1678 * would be rather costly for this rare event (the direct
1679 * update of a branch) to be worth it. So let's cheat and
1680 * check with HEAD only which should cover 99% of all usage
1681 * scenarios (even 100% of the default ones).
1683 unsigned char head_sha1
[20];
1685 const char *head_ref
;
1686 head_ref
= resolve_ref_unsafe("HEAD", head_sha1
, 1, &head_flag
);
1687 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1688 !strcmp(head_ref
, lock
->ref_name
))
1689 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1691 if (commit_ref(lock
)) {
1692 error("Couldn't set %s", lock
->ref_name
);
1700 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1703 const char *lockpath
;
1705 int fd
, len
, written
;
1706 char *git_HEAD
= git_pathdup("%s", ref_target
);
1707 unsigned char old_sha1
[20], new_sha1
[20];
1709 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1712 if (safe_create_leading_directories(git_HEAD
) < 0)
1713 return error("unable to create directory for %s", git_HEAD
);
1715 #ifndef NO_SYMLINK_HEAD
1716 if (prefer_symlink_refs
) {
1718 if (!symlink(refs_heads_master
, git_HEAD
))
1720 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1724 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1725 if (sizeof(ref
) <= len
) {
1726 error("refname too long: %s", refs_heads_master
);
1727 goto error_free_return
;
1729 lockpath
= mkpath("%s.lock", git_HEAD
);
1730 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1732 error("Unable to open %s for writing", lockpath
);
1733 goto error_free_return
;
1735 written
= write_in_full(fd
, ref
, len
);
1736 if (close(fd
) != 0 || written
!= len
) {
1737 error("Unable to write to %s", lockpath
);
1738 goto error_unlink_return
;
1740 if (rename(lockpath
, git_HEAD
) < 0) {
1741 error("Unable to create %s", git_HEAD
);
1742 goto error_unlink_return
;
1744 if (adjust_shared_perm(git_HEAD
)) {
1745 error("Unable to fix permissions on %s", lockpath
);
1746 error_unlink_return
:
1747 unlink_or_warn(lockpath
);
1753 #ifndef NO_SYMLINK_HEAD
1756 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1757 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1763 static char *ref_msg(const char *line
, const char *endp
)
1767 ep
= memchr(line
, '\n', endp
- line
);
1770 return xmemdupz(line
, ep
- line
);
1773 int read_ref_at(const char *refname
, unsigned long at_time
, int cnt
,
1774 unsigned char *sha1
, char **msg
,
1775 unsigned long *cutoff_time
, int *cutoff_tz
, int *cutoff_cnt
)
1777 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1779 int logfd
, tz
, reccnt
= 0;
1782 unsigned char logged_sha1
[20];
1786 logfile
= git_path("logs/%s", refname
);
1787 logfd
= open(logfile
, O_RDONLY
, 0);
1789 die_errno("Unable to read log '%s'", logfile
);
1792 die("Log %s is empty.", logfile
);
1793 mapsz
= xsize_t(st
.st_size
);
1794 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1795 logdata
= log_mapped
;
1799 rec
= logend
= logdata
+ st
.st_size
;
1800 while (logdata
< rec
) {
1802 if (logdata
< rec
&& *(rec
-1) == '\n')
1805 while (logdata
< rec
&& *(rec
-1) != '\n') {
1811 die("Log %s is corrupt.", logfile
);
1812 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1813 if (date
<= at_time
|| cnt
== 0) {
1814 tz
= strtoul(tz_c
, NULL
, 10);
1816 *msg
= ref_msg(rec
, logend
);
1818 *cutoff_time
= date
;
1822 *cutoff_cnt
= reccnt
- 1;
1824 if (get_sha1_hex(lastrec
, logged_sha1
))
1825 die("Log %s is corrupt.", logfile
);
1826 if (get_sha1_hex(rec
+ 41, sha1
))
1827 die("Log %s is corrupt.", logfile
);
1828 if (hashcmp(logged_sha1
, sha1
)) {
1829 warning("Log %s has gap after %s.",
1830 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1833 else if (date
== at_time
) {
1834 if (get_sha1_hex(rec
+ 41, sha1
))
1835 die("Log %s is corrupt.", logfile
);
1838 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1839 die("Log %s is corrupt.", logfile
);
1840 if (hashcmp(logged_sha1
, sha1
)) {
1841 warning("Log %s unexpectedly ended on %s.",
1842 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1845 munmap(log_mapped
, mapsz
);
1854 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1856 if (rec
== logend
|| *rec
== '\n')
1857 die("Log %s is corrupt.", logfile
);
1858 date
= strtoul(rec
+ 1, &tz_c
, 10);
1859 tz
= strtoul(tz_c
, NULL
, 10);
1860 if (get_sha1_hex(logdata
, sha1
))
1861 die("Log %s is corrupt.", logfile
);
1862 if (is_null_sha1(sha1
)) {
1863 if (get_sha1_hex(logdata
+ 41, sha1
))
1864 die("Log %s is corrupt.", logfile
);
1867 *msg
= ref_msg(logdata
, logend
);
1868 munmap(log_mapped
, mapsz
);
1871 *cutoff_time
= date
;
1875 *cutoff_cnt
= reccnt
;
1879 int for_each_recent_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1881 const char *logfile
;
1883 struct strbuf sb
= STRBUF_INIT
;
1886 logfile
= git_path("logs/%s", refname
);
1887 logfp
= fopen(logfile
, "r");
1892 struct stat statbuf
;
1893 if (fstat(fileno(logfp
), &statbuf
) ||
1894 statbuf
.st_size
< ofs
||
1895 fseek(logfp
, -ofs
, SEEK_END
) ||
1896 strbuf_getwholeline(&sb
, logfp
, '\n')) {
1898 strbuf_release(&sb
);
1903 while (!strbuf_getwholeline(&sb
, logfp
, '\n')) {
1904 unsigned char osha1
[20], nsha1
[20];
1905 char *email_end
, *message
;
1906 unsigned long timestamp
;
1909 /* old SP new SP name <email> SP time TAB msg LF */
1910 if (sb
.len
< 83 || sb
.buf
[sb
.len
- 1] != '\n' ||
1911 get_sha1_hex(sb
.buf
, osha1
) || sb
.buf
[40] != ' ' ||
1912 get_sha1_hex(sb
.buf
+ 41, nsha1
) || sb
.buf
[81] != ' ' ||
1913 !(email_end
= strchr(sb
.buf
+ 82, '>')) ||
1914 email_end
[1] != ' ' ||
1915 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1916 !message
|| message
[0] != ' ' ||
1917 (message
[1] != '+' && message
[1] != '-') ||
1918 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1919 !isdigit(message
[4]) || !isdigit(message
[5]))
1920 continue; /* corrupt? */
1921 email_end
[1] = '\0';
1922 tz
= strtol(message
+ 1, NULL
, 10);
1923 if (message
[6] != '\t')
1927 ret
= fn(osha1
, nsha1
, sb
.buf
+ 82, timestamp
, tz
, message
,
1933 strbuf_release(&sb
);
1937 int for_each_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, void *cb_data
)
1939 return for_each_recent_reflog_ent(refname
, fn
, 0, cb_data
);
1942 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
1944 DIR *dir
= opendir(git_path("logs/%s", base
));
1949 int baselen
= strlen(base
);
1950 char *log
= xmalloc(baselen
+ 257);
1952 memcpy(log
, base
, baselen
);
1953 if (baselen
&& base
[baselen
-1] != '/')
1954 log
[baselen
++] = '/';
1956 while ((de
= readdir(dir
)) != NULL
) {
1960 if (de
->d_name
[0] == '.')
1962 namelen
= strlen(de
->d_name
);
1965 if (has_extension(de
->d_name
, ".lock"))
1967 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
1968 if (stat(git_path("logs/%s", log
), &st
) < 0)
1970 if (S_ISDIR(st
.st_mode
)) {
1971 retval
= do_for_each_reflog(log
, fn
, cb_data
);
1973 unsigned char sha1
[20];
1974 if (read_ref_full(log
, sha1
, 0, NULL
))
1975 retval
= error("bad ref for %s", log
);
1977 retval
= fn(log
, sha1
, 0, cb_data
);
1990 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
1992 return do_for_each_reflog("", fn
, cb_data
);
1995 int update_ref(const char *action
, const char *refname
,
1996 const unsigned char *sha1
, const unsigned char *oldval
,
1997 int flags
, enum action_on_err onerr
)
1999 static struct ref_lock
*lock
;
2000 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
2002 const char *str
= "Cannot lock the ref '%s'.";
2004 case MSG_ON_ERR
: error(str
, refname
); break;
2005 case DIE_ON_ERR
: die(str
, refname
); break;
2006 case QUIET_ON_ERR
: break;
2010 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
2011 const char *str
= "Cannot update the ref '%s'.";
2013 case MSG_ON_ERR
: error(str
, refname
); break;
2014 case DIE_ON_ERR
: die(str
, refname
); break;
2015 case QUIET_ON_ERR
: break;
2022 int ref_exists(const char *refname
)
2024 unsigned char sha1
[20];
2025 return !!resolve_ref_unsafe(refname
, sha1
, 1, NULL
);
2028 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
2030 for ( ; list
; list
= list
->next
)
2031 if (!strcmp(list
->name
, name
))
2032 return (struct ref
*)list
;
2037 * generate a format suitable for scanf from a ref_rev_parse_rules
2038 * rule, that is replace the "%.*s" spec with a "%s" spec
2040 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
2044 spec
= strstr(rule
, "%.*s");
2045 if (!spec
|| strstr(spec
+ 4, "%.*s"))
2046 die("invalid rule in ref_rev_parse_rules: %s", rule
);
2048 /* copy all until spec */
2049 strncpy(scanf_fmt
, rule
, spec
- rule
);
2050 scanf_fmt
[spec
- rule
] = '\0';
2052 strcat(scanf_fmt
, "%s");
2053 /* copy remaining rule */
2054 strcat(scanf_fmt
, spec
+ 4);
2059 char *shorten_unambiguous_ref(const char *refname
, int strict
)
2062 static char **scanf_fmts
;
2063 static int nr_rules
;
2066 /* pre generate scanf formats from ref_rev_parse_rules[] */
2068 size_t total_len
= 0;
2070 /* the rule list is NULL terminated, count them first */
2071 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
2072 /* no +1 because strlen("%s") < strlen("%.*s") */
2073 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
2075 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
2078 for (i
= 0; i
< nr_rules
; i
++) {
2079 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
2081 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
2082 total_len
+= strlen(ref_rev_parse_rules
[i
]);
2086 /* bail out if there are no rules */
2088 return xstrdup(refname
);
2090 /* buffer for scanf result, at most refname must fit */
2091 short_name
= xstrdup(refname
);
2093 /* skip first rule, it will always match */
2094 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
2096 int rules_to_fail
= i
;
2099 if (1 != sscanf(refname
, scanf_fmts
[i
], short_name
))
2102 short_name_len
= strlen(short_name
);
2105 * in strict mode, all (except the matched one) rules
2106 * must fail to resolve to a valid non-ambiguous ref
2109 rules_to_fail
= nr_rules
;
2112 * check if the short name resolves to a valid ref,
2113 * but use only rules prior to the matched one
2115 for (j
= 0; j
< rules_to_fail
; j
++) {
2116 const char *rule
= ref_rev_parse_rules
[j
];
2117 char refname
[PATH_MAX
];
2119 /* skip matched rule */
2124 * the short name is ambiguous, if it resolves
2125 * (with this previous rule) to a valid ref
2126 * read_ref() returns 0 on success
2128 mksnpath(refname
, sizeof(refname
),
2129 rule
, short_name_len
, short_name
);
2130 if (ref_exists(refname
))
2135 * short name is non-ambiguous if all previous rules
2136 * haven't resolved to a valid ref
2138 if (j
== rules_to_fail
)
2143 return xstrdup(refname
);