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 /* Add a ref_entry to the end of the ref_array (unsorted). */
57 static void add_ref(const char *refname
, const unsigned char *sha1
,
58 int flag
, int check_name
, struct ref_array
*refs
,
59 struct ref_entry
**new_entry
)
62 struct ref_entry
*entry
;
64 /* Allocate it and add it in.. */
65 len
= strlen(refname
) + 1;
66 entry
= xmalloc(sizeof(struct ref_entry
) + len
);
67 hashcpy(entry
->sha1
, sha1
);
68 hashclr(entry
->peeled
);
70 check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
|REFNAME_DOT_COMPONENT
))
71 die("Reference has invalid format: '%s'", refname
);
72 memcpy(entry
->name
, refname
, len
);
76 ALLOC_GROW(refs
->refs
, refs
->nr
+ 1, refs
->alloc
);
77 refs
->refs
[refs
->nr
++] = entry
;
80 static int ref_entry_cmp(const void *a
, const void *b
)
82 struct ref_entry
*one
= *(struct ref_entry
**)a
;
83 struct ref_entry
*two
= *(struct ref_entry
**)b
;
84 return strcmp(one
->name
, two
->name
);
88 * Emit a warning and return true iff ref1 and ref2 have the same name
89 * and the same sha1. Die if they have the same name but different
92 static int is_dup_ref(const struct ref_entry
*ref1
, const struct ref_entry
*ref2
)
94 if (!strcmp(ref1
->name
, ref2
->name
)) {
95 /* Duplicate name; make sure that the SHA1s match: */
96 if (hashcmp(ref1
->sha1
, ref2
->sha1
))
97 die("Duplicated ref, and SHA1s don't match: %s",
99 warning("Duplicated ref: %s", ref1
->name
);
106 static void sort_ref_array(struct ref_array
*array
)
110 /* Nothing to sort unless there are at least two entries */
114 qsort(array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
116 /* Remove any duplicates from the ref_array */
118 for (j
= 1; j
< array
->nr
; j
++) {
119 if (is_dup_ref(array
->refs
[i
], array
->refs
[j
])) {
120 free(array
->refs
[j
]);
123 array
->refs
[++i
] = array
->refs
[j
];
128 static struct ref_entry
*search_ref_array(struct ref_array
*array
, const char *refname
)
130 struct ref_entry
*e
, **r
;
139 len
= strlen(refname
) + 1;
140 e
= xmalloc(sizeof(struct ref_entry
) + len
);
141 memcpy(e
->name
, refname
, len
);
143 r
= bsearch(&e
, array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
154 * Future: need to be in "struct repository"
155 * when doing a full libification.
157 static struct ref_cache
{
158 struct ref_cache
*next
;
161 struct ref_array loose
;
162 struct ref_array packed
;
163 /* The submodule name, or "" for the main repo. */
164 char name
[FLEX_ARRAY
];
167 static struct ref_entry
*current_ref
;
169 static struct ref_array extra_refs
;
171 static void clear_ref_array(struct ref_array
*array
)
174 for (i
= 0; i
< array
->nr
; i
++)
175 free(array
->refs
[i
]);
177 array
->nr
= array
->alloc
= 0;
181 static void clear_packed_ref_cache(struct ref_cache
*refs
)
183 if (refs
->did_packed
)
184 clear_ref_array(&refs
->packed
);
185 refs
->did_packed
= 0;
188 static void clear_loose_ref_cache(struct ref_cache
*refs
)
191 clear_ref_array(&refs
->loose
);
195 static struct ref_cache
*create_ref_cache(const char *submodule
)
198 struct ref_cache
*refs
;
201 len
= strlen(submodule
) + 1;
202 refs
= xcalloc(1, sizeof(struct ref_cache
) + len
);
203 memcpy(refs
->name
, submodule
, len
);
208 * Return a pointer to a ref_cache for the specified submodule. For
209 * the main repository, use submodule==NULL. The returned structure
210 * will be allocated and initialized but not necessarily populated; it
211 * should not be freed.
213 static struct ref_cache
*get_ref_cache(const char *submodule
)
215 struct ref_cache
*refs
= ref_cache
;
219 if (!strcmp(submodule
, refs
->name
))
224 refs
= create_ref_cache(submodule
);
225 refs
->next
= ref_cache
;
230 void invalidate_ref_cache(const char *submodule
)
232 struct ref_cache
*refs
= get_ref_cache(submodule
);
233 clear_packed_ref_cache(refs
);
234 clear_loose_ref_cache(refs
);
237 static void read_packed_refs(FILE *f
, struct ref_array
*array
)
239 struct ref_entry
*last
= NULL
;
240 char refline
[PATH_MAX
];
241 int flag
= REF_ISPACKED
;
243 while (fgets(refline
, sizeof(refline
), f
)) {
244 unsigned char sha1
[20];
246 static const char header
[] = "# pack-refs with:";
248 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
249 const char *traits
= refline
+ sizeof(header
) - 1;
250 if (strstr(traits
, " peeled "))
251 flag
|= REF_KNOWS_PEELED
;
252 /* perhaps other traits later as well */
256 refname
= parse_ref_line(refline
, sha1
);
258 add_ref(refname
, sha1
, flag
, 1, array
, &last
);
263 strlen(refline
) == 42 &&
264 refline
[41] == '\n' &&
265 !get_sha1_hex(refline
+ 1, sha1
))
266 hashcpy(last
->peeled
, sha1
);
268 sort_ref_array(array
);
271 void add_extra_ref(const char *refname
, const unsigned char *sha1
, int flag
)
273 add_ref(refname
, sha1
, flag
, 0, &extra_refs
, NULL
);
276 void clear_extra_refs(void)
278 clear_ref_array(&extra_refs
);
281 static struct ref_array
*get_packed_refs(const char *submodule
)
283 struct ref_cache
*refs
= get_ref_cache(submodule
);
285 if (!refs
->did_packed
) {
286 const char *packed_refs_file
;
290 packed_refs_file
= git_path_submodule(submodule
, "packed-refs");
292 packed_refs_file
= git_path("packed-refs");
293 f
= fopen(packed_refs_file
, "r");
295 read_packed_refs(f
, &refs
->packed
);
298 refs
->did_packed
= 1;
300 return &refs
->packed
;
303 static void get_ref_dir(const char *submodule
, const char *base
,
304 struct ref_array
*array
)
310 path
= git_path_submodule(submodule
, "%s", base
);
312 path
= git_path("%s", base
);
319 int baselen
= strlen(base
);
320 char *refname
= xmalloc(baselen
+ 257);
322 memcpy(refname
, base
, baselen
);
323 if (baselen
&& base
[baselen
-1] != '/')
324 refname
[baselen
++] = '/';
326 while ((de
= readdir(dir
)) != NULL
) {
327 unsigned char sha1
[20];
333 if (de
->d_name
[0] == '.')
335 namelen
= strlen(de
->d_name
);
338 if (has_extension(de
->d_name
, ".lock"))
340 memcpy(refname
+ baselen
, de
->d_name
, namelen
+1);
342 ? git_path_submodule(submodule
, "%s", refname
)
343 : git_path("%s", refname
);
344 if (stat(refdir
, &st
) < 0)
346 if (S_ISDIR(st
.st_mode
)) {
347 get_ref_dir(submodule
, refname
, array
);
353 if (resolve_gitlink_ref(submodule
, refname
, sha1
) < 0) {
355 flag
|= REF_ISBROKEN
;
357 } else if (read_ref_full(refname
, sha1
, 1, &flag
)) {
359 flag
|= REF_ISBROKEN
;
361 add_ref(refname
, sha1
, flag
, 1, array
, NULL
);
368 struct warn_if_dangling_data
{
374 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
375 int flags
, void *cb_data
)
377 struct warn_if_dangling_data
*d
= cb_data
;
378 const char *resolves_to
;
379 unsigned char junk
[20];
381 if (!(flags
& REF_ISSYMREF
))
384 resolves_to
= resolve_ref(refname
, junk
, 0, NULL
);
385 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
388 fprintf(d
->fp
, d
->msg_fmt
, refname
);
392 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
394 struct warn_if_dangling_data data
;
397 data
.refname
= refname
;
398 data
.msg_fmt
= msg_fmt
;
399 for_each_rawref(warn_if_dangling_symref
, &data
);
402 static struct ref_array
*get_loose_refs(const char *submodule
)
404 struct ref_cache
*refs
= get_ref_cache(submodule
);
406 if (!refs
->did_loose
) {
407 get_ref_dir(submodule
, "refs", &refs
->loose
);
408 sort_ref_array(&refs
->loose
);
414 /* We allow "recursive" symbolic refs. Only within reason, though */
416 #define MAXREFLEN (1024)
419 * Called by resolve_gitlink_ref_recursive() after it failed to read
420 * from "name", which is "module/.git/<refname>". Find <refname> in
421 * the packed-refs file for the submodule.
423 static int resolve_gitlink_packed_ref(char *name
, int pathlen
,
424 const char *refname
, unsigned char *sha1
)
427 struct ref_entry
*ref
;
428 struct ref_array
*array
;
430 /* being defensive: resolve_gitlink_ref() did this for us */
431 if (pathlen
< 6 || memcmp(name
+ pathlen
- 6, "/.git/", 6))
433 name
[pathlen
- 6] = '\0'; /* make it path to the submodule */
434 array
= get_packed_refs(name
);
435 ref
= search_ref_array(array
, refname
);
437 memcpy(sha1
, ref
->sha1
, 20);
443 static int resolve_gitlink_ref_recursive(char *name
, int pathlen
,
444 const char *refname
, unsigned char *sha1
,
447 int fd
, len
= strlen(refname
);
448 char buffer
[128], *p
;
450 if (recursion
> MAXDEPTH
|| len
> MAXREFLEN
)
452 memcpy(name
+ pathlen
, refname
, len
+1);
453 fd
= open(name
, O_RDONLY
);
455 return resolve_gitlink_packed_ref(name
, pathlen
, 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(name
, pathlen
, p
, sha1
, recursion
+1);
479 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *sha1
)
481 int len
= strlen(path
), retval
;
485 while (len
&& path
[len
-1] == '/')
489 gitdir
= xmalloc(len
+ MAXREFLEN
+ 8);
490 memcpy(gitdir
, path
, len
);
491 memcpy(gitdir
+ len
, "/.git", 6);
494 tmp
= read_gitfile(gitdir
);
498 gitdir
= xmalloc(len
+ MAXREFLEN
+ 3);
499 memcpy(gitdir
, tmp
, len
);
502 gitdir
[++len
] = '\0';
503 retval
= resolve_gitlink_ref_recursive(gitdir
, len
, refname
, sha1
, 0);
509 * Try to read ref from the packed references. On success, set sha1
510 * and return 0; otherwise, return -1.
512 static int get_packed_ref(const char *refname
, unsigned char *sha1
)
514 struct ref_array
*packed
= get_packed_refs(NULL
);
515 struct ref_entry
*entry
= search_ref_array(packed
, refname
);
517 hashcpy(sha1
, entry
->sha1
);
523 const char *resolve_ref(const char *refname
, unsigned char *sha1
, int reading
, int *flag
)
525 int depth
= MAXDEPTH
;
528 static char refname_buffer
[256];
533 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
545 git_snpath(path
, sizeof(path
), "%s", refname
);
547 if (lstat(path
, &st
) < 0) {
551 * The loose reference file does not exist;
552 * check for a packed reference.
554 if (!get_packed_ref(refname
, sha1
)) {
556 *flag
|= REF_ISPACKED
;
559 /* The reference is not a packed reference, either. */
568 /* Follow "normalized" - ie "refs/.." symlinks by hand */
569 if (S_ISLNK(st
.st_mode
)) {
570 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
574 if (!prefixcmp(buffer
, "refs/") &&
575 !check_refname_format(buffer
, 0)) {
576 strcpy(refname_buffer
, buffer
);
577 refname
= refname_buffer
;
579 *flag
|= REF_ISSYMREF
;
584 /* Is it a directory? */
585 if (S_ISDIR(st
.st_mode
)) {
591 * Anything else, just open it and try to use it as
594 fd
= open(path
, O_RDONLY
);
597 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
601 while (len
&& isspace(buffer
[len
-1]))
606 * Is it a symbolic ref?
608 if (prefixcmp(buffer
, "ref:"))
611 *flag
|= REF_ISSYMREF
;
613 while (isspace(*buf
))
615 if (check_refname_format(buf
, REFNAME_ALLOW_ONELEVEL
)) {
617 *flag
|= REF_ISBROKEN
;
620 refname
= strcpy(refname_buffer
, buf
);
622 /* Please note that FETCH_HEAD has a second line containing other data. */
623 if (get_sha1_hex(buffer
, sha1
) || (buffer
[40] != '\0' && !isspace(buffer
[40]))) {
625 *flag
|= REF_ISBROKEN
;
631 /* The argument to filter_refs */
638 int read_ref_full(const char *refname
, unsigned char *sha1
, int reading
, int *flags
)
640 if (resolve_ref(refname
, sha1
, reading
, flags
))
645 int read_ref(const char *refname
, unsigned char *sha1
)
647 return read_ref_full(refname
, sha1
, 1, NULL
);
650 #define DO_FOR_EACH_INCLUDE_BROKEN 01
651 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
652 int flags
, void *cb_data
, struct ref_entry
*entry
)
654 if (prefixcmp(entry
->name
, base
))
657 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
658 if (entry
->flag
& REF_ISBROKEN
)
659 return 0; /* ignore broken refs e.g. dangling symref */
660 if (!has_sha1_file(entry
->sha1
)) {
661 error("%s does not point to a valid object!", entry
->name
);
666 return fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
669 static int filter_refs(const char *refname
, const unsigned char *sha1
, int flags
,
672 struct ref_filter
*filter
= (struct ref_filter
*)data
;
673 if (fnmatch(filter
->pattern
, refname
, 0))
675 return filter
->fn(refname
, sha1
, flags
, filter
->cb_data
);
678 int peel_ref(const char *refname
, unsigned char *sha1
)
681 unsigned char base
[20];
684 if (current_ref
&& (current_ref
->name
== refname
685 || !strcmp(current_ref
->name
, refname
))) {
686 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
687 hashcpy(sha1
, current_ref
->peeled
);
690 hashcpy(base
, current_ref
->sha1
);
694 if (read_ref_full(refname
, base
, 1, &flag
))
697 if ((flag
& REF_ISPACKED
)) {
698 struct ref_array
*array
= get_packed_refs(NULL
);
699 struct ref_entry
*r
= search_ref_array(array
, refname
);
701 if (r
!= NULL
&& r
->flag
& REF_KNOWS_PEELED
) {
702 hashcpy(sha1
, r
->peeled
);
708 o
= parse_object(base
);
709 if (o
&& o
->type
== OBJ_TAG
) {
710 o
= deref_tag(o
, refname
, 0);
712 hashcpy(sha1
, o
->sha1
);
719 static int do_for_each_ref(const char *submodule
, const char *base
, each_ref_fn fn
,
720 int trim
, int flags
, void *cb_data
)
722 int retval
= 0, i
, p
= 0, l
= 0;
723 struct ref_array
*packed
= get_packed_refs(submodule
);
724 struct ref_array
*loose
= get_loose_refs(submodule
);
726 struct ref_array
*extra
= &extra_refs
;
728 for (i
= 0; i
< extra
->nr
; i
++)
729 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, extra
->refs
[i
]);
731 while (p
< packed
->nr
&& l
< loose
->nr
) {
732 struct ref_entry
*entry
;
733 int cmp
= strcmp(packed
->refs
[p
]->name
, loose
->refs
[l
]->name
);
739 entry
= loose
->refs
[l
++];
741 entry
= packed
->refs
[p
++];
743 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, entry
);
753 for (; p
< packed
->nr
; p
++) {
754 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, packed
->refs
[p
]);
765 static int do_head_ref(const char *submodule
, each_ref_fn fn
, void *cb_data
)
767 unsigned char sha1
[20];
771 if (resolve_gitlink_ref(submodule
, "HEAD", sha1
) == 0)
772 return fn("HEAD", sha1
, 0, cb_data
);
777 if (!read_ref_full("HEAD", sha1
, 1, &flag
))
778 return fn("HEAD", sha1
, flag
, cb_data
);
783 int head_ref(each_ref_fn fn
, void *cb_data
)
785 return do_head_ref(NULL
, fn
, cb_data
);
788 int head_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
790 return do_head_ref(submodule
, fn
, cb_data
);
793 int for_each_ref(each_ref_fn fn
, void *cb_data
)
795 return do_for_each_ref(NULL
, "", fn
, 0, 0, cb_data
);
798 int for_each_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
800 return do_for_each_ref(submodule
, "", fn
, 0, 0, cb_data
);
803 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
805 return do_for_each_ref(NULL
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
808 int for_each_ref_in_submodule(const char *submodule
, const char *prefix
,
809 each_ref_fn fn
, void *cb_data
)
811 return do_for_each_ref(submodule
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
814 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
816 return for_each_ref_in("refs/tags/", fn
, cb_data
);
819 int for_each_tag_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
821 return for_each_ref_in_submodule(submodule
, "refs/tags/", fn
, cb_data
);
824 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
826 return for_each_ref_in("refs/heads/", fn
, cb_data
);
829 int for_each_branch_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
831 return for_each_ref_in_submodule(submodule
, "refs/heads/", fn
, cb_data
);
834 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
836 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
839 int for_each_remote_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
841 return for_each_ref_in_submodule(submodule
, "refs/remotes/", fn
, cb_data
);
844 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
846 return do_for_each_ref(NULL
, "refs/replace/", fn
, 13, 0, cb_data
);
849 int head_ref_namespaced(each_ref_fn fn
, void *cb_data
)
851 struct strbuf buf
= STRBUF_INIT
;
853 unsigned char sha1
[20];
856 strbuf_addf(&buf
, "%sHEAD", get_git_namespace());
857 if (!read_ref_full(buf
.buf
, sha1
, 1, &flag
))
858 ret
= fn(buf
.buf
, sha1
, flag
, cb_data
);
859 strbuf_release(&buf
);
864 int for_each_namespaced_ref(each_ref_fn fn
, void *cb_data
)
866 struct strbuf buf
= STRBUF_INIT
;
868 strbuf_addf(&buf
, "%srefs/", get_git_namespace());
869 ret
= do_for_each_ref(NULL
, buf
.buf
, fn
, 0, 0, cb_data
);
870 strbuf_release(&buf
);
874 int for_each_glob_ref_in(each_ref_fn fn
, const char *pattern
,
875 const char *prefix
, void *cb_data
)
877 struct strbuf real_pattern
= STRBUF_INIT
;
878 struct ref_filter filter
;
881 if (!prefix
&& prefixcmp(pattern
, "refs/"))
882 strbuf_addstr(&real_pattern
, "refs/");
884 strbuf_addstr(&real_pattern
, prefix
);
885 strbuf_addstr(&real_pattern
, pattern
);
887 if (!has_glob_specials(pattern
)) {
888 /* Append implied '/' '*' if not present. */
889 if (real_pattern
.buf
[real_pattern
.len
- 1] != '/')
890 strbuf_addch(&real_pattern
, '/');
891 /* No need to check for '*', there is none. */
892 strbuf_addch(&real_pattern
, '*');
895 filter
.pattern
= real_pattern
.buf
;
897 filter
.cb_data
= cb_data
;
898 ret
= for_each_ref(filter_refs
, &filter
);
900 strbuf_release(&real_pattern
);
904 int for_each_glob_ref(each_ref_fn fn
, const char *pattern
, void *cb_data
)
906 return for_each_glob_ref_in(fn
, pattern
, NULL
, cb_data
);
909 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
911 return do_for_each_ref(NULL
, "", fn
, 0,
912 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
916 * Make sure "ref" is something reasonable to have under ".git/refs/";
917 * We do not like it if:
919 * - any path component of it begins with ".", or
920 * - it has double dots "..", or
921 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
922 * - it ends with a "/".
923 * - it ends with ".lock"
924 * - it contains a "\" (backslash)
927 /* Return true iff ch is not allowed in reference names. */
928 static inline int bad_ref_char(int ch
)
930 if (((unsigned) ch
) <= ' ' || ch
== 0x7f ||
931 ch
== '~' || ch
== '^' || ch
== ':' || ch
== '\\')
933 /* 2.13 Pattern Matching Notation */
934 if (ch
== '*' || ch
== '?' || ch
== '[') /* Unsupported */
940 * Try to read one refname component from the front of refname. Return
941 * the length of the component found, or -1 if the component is not
944 static int check_refname_component(const char *refname
, int flags
)
949 for (cp
= refname
; ; cp
++) {
951 if (ch
== '\0' || ch
== '/')
953 if (bad_ref_char(ch
))
954 return -1; /* Illegal character in refname. */
955 if (last
== '.' && ch
== '.')
956 return -1; /* Refname contains "..". */
957 if (last
== '@' && ch
== '{')
958 return -1; /* Refname contains "@{". */
962 return -1; /* Component has zero length. */
963 if (refname
[0] == '.') {
964 if (!(flags
& REFNAME_DOT_COMPONENT
))
965 return -1; /* Component starts with '.'. */
967 * Even if leading dots are allowed, don't allow "."
968 * as a component (".." is prevented by a rule above).
970 if (refname
[1] == '\0')
971 return -1; /* Component equals ".". */
973 if (cp
- refname
>= 5 && !memcmp(cp
- 5, ".lock", 5))
974 return -1; /* Refname ends with ".lock". */
978 int check_refname_format(const char *refname
, int flags
)
980 int component_len
, component_count
= 0;
983 /* We are at the start of a path component. */
984 component_len
= check_refname_component(refname
, flags
);
985 if (component_len
< 0) {
986 if ((flags
& REFNAME_REFSPEC_PATTERN
) &&
988 (refname
[1] == '\0' || refname
[1] == '/')) {
989 /* Accept one wildcard as a full refname component. */
990 flags
&= ~REFNAME_REFSPEC_PATTERN
;
997 if (refname
[component_len
] == '\0')
999 /* Skip to next component. */
1000 refname
+= component_len
+ 1;
1003 if (refname
[component_len
- 1] == '.')
1004 return -1; /* Refname ends with '.'. */
1005 if (!(flags
& REFNAME_ALLOW_ONELEVEL
) && component_count
< 2)
1006 return -1; /* Refname has only one component. */
1010 const char *prettify_refname(const char *name
)
1013 !prefixcmp(name
, "refs/heads/") ? 11 :
1014 !prefixcmp(name
, "refs/tags/") ? 10 :
1015 !prefixcmp(name
, "refs/remotes/") ? 13 :
1019 const char *ref_rev_parse_rules
[] = {
1024 "refs/remotes/%.*s",
1025 "refs/remotes/%.*s/HEAD",
1029 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
1032 const int abbrev_name_len
= strlen(abbrev_name
);
1034 for (p
= rules
; *p
; p
++) {
1035 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
1043 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
1044 const unsigned char *old_sha1
, int mustexist
)
1046 if (read_ref_full(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
1047 error("Can't verify ref %s", lock
->ref_name
);
1051 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
1052 error("Ref %s is at %s but expected %s", lock
->ref_name
,
1053 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
1060 static int remove_empty_directories(const char *file
)
1062 /* we want to create a file but there is a directory there;
1063 * if that is an empty directory (or a directory that contains
1064 * only empty directories), remove them.
1069 strbuf_init(&path
, 20);
1070 strbuf_addstr(&path
, file
);
1072 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
1074 strbuf_release(&path
);
1080 * Return true iff a reference named refname could be created without
1081 * conflicting with the name of an existing reference. If oldrefname
1082 * is non-NULL, ignore potential conflicts with oldrefname (e.g.,
1083 * because oldrefname is scheduled for deletion in the same
1086 static int is_refname_available(const char *refname
, const char *oldrefname
,
1087 struct ref_array
*array
)
1089 int i
, namlen
= strlen(refname
); /* e.g. 'foo/bar' */
1090 for (i
= 0; i
< array
->nr
; i
++ ) {
1091 struct ref_entry
*entry
= array
->refs
[i
];
1092 /* entry->name could be 'foo' or 'foo/bar/baz' */
1093 if (!oldrefname
|| strcmp(oldrefname
, entry
->name
)) {
1094 int len
= strlen(entry
->name
);
1095 int cmplen
= (namlen
< len
) ? namlen
: len
;
1096 const char *lead
= (namlen
< len
) ? entry
->name
: refname
;
1097 if (!strncmp(refname
, entry
->name
, cmplen
) &&
1098 lead
[cmplen
] == '/') {
1099 error("'%s' exists; cannot create '%s'",
1100 entry
->name
, refname
);
1109 * *string and *len will only be substituted, and *string returned (for
1110 * later free()ing) if the string passed in is a magic short-hand form
1113 static char *substitute_branch_name(const char **string
, int *len
)
1115 struct strbuf buf
= STRBUF_INIT
;
1116 int ret
= interpret_branch_name(*string
, &buf
);
1120 *string
= strbuf_detach(&buf
, &size
);
1122 return (char *)*string
;
1128 int dwim_ref(const char *str
, int len
, unsigned char *sha1
, char **ref
)
1130 char *last_branch
= substitute_branch_name(&str
, &len
);
1135 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1136 char fullref
[PATH_MAX
];
1137 unsigned char sha1_from_ref
[20];
1138 unsigned char *this_result
;
1141 this_result
= refs_found
? sha1_from_ref
: sha1
;
1142 mksnpath(fullref
, sizeof(fullref
), *p
, len
, str
);
1143 r
= resolve_ref(fullref
, this_result
, 1, &flag
);
1147 if (!warn_ambiguous_refs
)
1149 } else if ((flag
& REF_ISSYMREF
) && strcmp(fullref
, "HEAD")) {
1150 warning("ignoring dangling symref %s.", fullref
);
1151 } else if ((flag
& REF_ISBROKEN
) && strchr(fullref
, '/')) {
1152 warning("ignoring broken ref %s.", fullref
);
1159 int dwim_log(const char *str
, int len
, unsigned char *sha1
, char **log
)
1161 char *last_branch
= substitute_branch_name(&str
, &len
);
1166 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1168 unsigned char hash
[20];
1169 char path
[PATH_MAX
];
1170 const char *ref
, *it
;
1172 mksnpath(path
, sizeof(path
), *p
, len
, str
);
1173 ref
= resolve_ref(path
, hash
, 1, NULL
);
1176 if (!stat(git_path("logs/%s", path
), &st
) &&
1177 S_ISREG(st
.st_mode
))
1179 else if (strcmp(ref
, path
) &&
1180 !stat(git_path("logs/%s", ref
), &st
) &&
1181 S_ISREG(st
.st_mode
))
1185 if (!logs_found
++) {
1187 hashcpy(sha1
, hash
);
1189 if (!warn_ambiguous_refs
)
1196 static struct ref_lock
*lock_ref_sha1_basic(const char *refname
,
1197 const unsigned char *old_sha1
,
1198 int flags
, int *type_p
)
1201 const char *orig_refname
= refname
;
1202 struct ref_lock
*lock
;
1205 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1208 lock
= xcalloc(1, sizeof(struct ref_lock
));
1211 refname
= resolve_ref(refname
, lock
->old_sha1
, mustexist
, &type
);
1212 if (!refname
&& errno
== EISDIR
) {
1213 /* we are trying to lock foo but we used to
1214 * have foo/bar which now does not exist;
1215 * it is normal for the empty directory 'foo'
1218 ref_file
= git_path("%s", orig_refname
);
1219 if (remove_empty_directories(ref_file
)) {
1221 error("there are still refs under '%s'", orig_refname
);
1224 refname
= resolve_ref(orig_refname
, lock
->old_sha1
, mustexist
, &type
);
1230 error("unable to resolve reference %s: %s",
1231 orig_refname
, strerror(errno
));
1234 missing
= is_null_sha1(lock
->old_sha1
);
1235 /* When the ref did not exist and we are creating it,
1236 * make sure there is no existing ref that is packed
1237 * whose name begins with our refname, nor a ref whose
1238 * name is a proper prefix of our refname.
1241 !is_refname_available(refname
, NULL
, get_packed_refs(NULL
))) {
1242 last_errno
= ENOTDIR
;
1246 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1248 lflags
= LOCK_DIE_ON_ERROR
;
1249 if (flags
& REF_NODEREF
) {
1250 refname
= orig_refname
;
1251 lflags
|= LOCK_NODEREF
;
1253 lock
->ref_name
= xstrdup(refname
);
1254 lock
->orig_ref_name
= xstrdup(orig_refname
);
1255 ref_file
= git_path("%s", refname
);
1257 lock
->force_write
= 1;
1258 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
1259 lock
->force_write
= 1;
1261 if (safe_create_leading_directories(ref_file
)) {
1263 error("unable to create directory for %s", ref_file
);
1267 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
1268 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
1276 struct ref_lock
*lock_ref_sha1(const char *refname
, const unsigned char *old_sha1
)
1278 char refpath
[PATH_MAX
];
1279 if (check_refname_format(refname
, 0))
1281 strcpy(refpath
, mkpath("refs/%s", refname
));
1282 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
1285 struct ref_lock
*lock_any_ref_for_update(const char *refname
,
1286 const unsigned char *old_sha1
, int flags
)
1288 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
1290 return lock_ref_sha1_basic(refname
, old_sha1
, flags
, NULL
);
1293 static struct lock_file packlock
;
1295 static int repack_without_ref(const char *refname
)
1297 struct ref_array
*packed
;
1298 struct ref_entry
*ref
;
1301 packed
= get_packed_refs(NULL
);
1302 ref
= search_ref_array(packed
, refname
);
1305 fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
1307 unable_to_lock_error(git_path("packed-refs"), errno
);
1308 return error("cannot delete '%s' from packed refs", refname
);
1311 for (i
= 0; i
< packed
->nr
; i
++) {
1312 char line
[PATH_MAX
+ 100];
1315 ref
= packed
->refs
[i
];
1317 if (!strcmp(refname
, ref
->name
))
1319 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1320 sha1_to_hex(ref
->sha1
), ref
->name
);
1321 /* this should not happen but just being defensive */
1322 if (len
> sizeof(line
))
1323 die("too long a refname '%s'", ref
->name
);
1324 write_or_die(fd
, line
, len
);
1326 return commit_lock_file(&packlock
);
1329 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1331 struct ref_lock
*lock
;
1332 int err
, i
= 0, ret
= 0, flag
= 0;
1334 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1337 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1341 if (!(delopt
& REF_NODEREF
)) {
1342 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1343 lock
->lk
->filename
[i
] = 0;
1344 path
= lock
->lk
->filename
;
1346 path
= git_path("%s", refname
);
1348 err
= unlink_or_warn(path
);
1349 if (err
&& errno
!= ENOENT
)
1352 if (!(delopt
& REF_NODEREF
))
1353 lock
->lk
->filename
[i
] = '.';
1355 /* removing the loose one could have resurrected an earlier
1356 * packed one. Also, if it was not loose we need to repack
1359 ret
|= repack_without_ref(refname
);
1361 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1362 invalidate_ref_cache(NULL
);
1368 * People using contrib's git-new-workdir have .git/logs/refs ->
1369 * /some/other/path/.git/logs/refs, and that may live on another device.
1371 * IOW, to avoid cross device rename errors, the temporary renamed log must
1372 * live into logs/refs.
1374 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1376 int rename_ref(const char *oldrefname
, const char *newrefname
, const char *logmsg
)
1378 unsigned char sha1
[20], orig_sha1
[20];
1379 int flag
= 0, logmoved
= 0;
1380 struct ref_lock
*lock
;
1381 struct stat loginfo
;
1382 int log
= !lstat(git_path("logs/%s", oldrefname
), &loginfo
);
1383 const char *symref
= NULL
;
1385 if (log
&& S_ISLNK(loginfo
.st_mode
))
1386 return error("reflog for %s is a symlink", oldrefname
);
1388 symref
= resolve_ref(oldrefname
, orig_sha1
, 1, &flag
);
1389 if (flag
& REF_ISSYMREF
)
1390 return error("refname %s is a symbolic ref, renaming it is not supported",
1393 return error("refname %s not found", oldrefname
);
1395 if (!is_refname_available(newrefname
, oldrefname
, get_packed_refs(NULL
)))
1398 if (!is_refname_available(newrefname
, oldrefname
, get_loose_refs(NULL
)))
1401 if (log
&& rename(git_path("logs/%s", oldrefname
), git_path(TMP_RENAMED_LOG
)))
1402 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG
": %s",
1403 oldrefname
, strerror(errno
));
1405 if (delete_ref(oldrefname
, orig_sha1
, REF_NODEREF
)) {
1406 error("unable to delete old %s", oldrefname
);
1410 if (!read_ref_full(newrefname
, sha1
, 1, &flag
) &&
1411 delete_ref(newrefname
, sha1
, REF_NODEREF
)) {
1412 if (errno
==EISDIR
) {
1413 if (remove_empty_directories(git_path("%s", newrefname
))) {
1414 error("Directory not empty: %s", newrefname
);
1418 error("unable to delete existing %s", newrefname
);
1423 if (log
&& safe_create_leading_directories(git_path("logs/%s", newrefname
))) {
1424 error("unable to create directory for %s", newrefname
);
1429 if (log
&& rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", newrefname
))) {
1430 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1432 * rename(a, b) when b is an existing
1433 * directory ought to result in ISDIR, but
1434 * Solaris 5.8 gives ENOTDIR. Sheesh.
1436 if (remove_empty_directories(git_path("logs/%s", newrefname
))) {
1437 error("Directory not empty: logs/%s", newrefname
);
1442 error("unable to move logfile "TMP_RENAMED_LOG
" to logs/%s: %s",
1443 newrefname
, strerror(errno
));
1449 lock
= lock_ref_sha1_basic(newrefname
, NULL
, 0, NULL
);
1451 error("unable to lock %s for update", newrefname
);
1454 lock
->force_write
= 1;
1455 hashcpy(lock
->old_sha1
, orig_sha1
);
1456 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1457 error("unable to write current sha1 into %s", newrefname
);
1464 lock
= lock_ref_sha1_basic(oldrefname
, NULL
, 0, NULL
);
1466 error("unable to lock %s for rollback", oldrefname
);
1470 lock
->force_write
= 1;
1471 flag
= log_all_ref_updates
;
1472 log_all_ref_updates
= 0;
1473 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1474 error("unable to write current sha1 into %s", oldrefname
);
1475 log_all_ref_updates
= flag
;
1478 if (logmoved
&& rename(git_path("logs/%s", newrefname
), git_path("logs/%s", oldrefname
)))
1479 error("unable to restore logfile %s from %s: %s",
1480 oldrefname
, newrefname
, strerror(errno
));
1481 if (!logmoved
&& log
&&
1482 rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", oldrefname
)))
1483 error("unable to restore logfile %s from "TMP_RENAMED_LOG
": %s",
1484 oldrefname
, strerror(errno
));
1489 int close_ref(struct ref_lock
*lock
)
1491 if (close_lock_file(lock
->lk
))
1497 int commit_ref(struct ref_lock
*lock
)
1499 if (commit_lock_file(lock
->lk
))
1505 void unlock_ref(struct ref_lock
*lock
)
1507 /* Do not free lock->lk -- atexit() still looks at them */
1509 rollback_lock_file(lock
->lk
);
1510 free(lock
->ref_name
);
1511 free(lock
->orig_ref_name
);
1516 * copy the reflog message msg to buf, which has been allocated sufficiently
1517 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1518 * because reflog file is one line per entry.
1520 static int copy_msg(char *buf
, const char *msg
)
1527 while ((c
= *msg
++)) {
1528 if (wasspace
&& isspace(c
))
1530 wasspace
= isspace(c
);
1535 while (buf
< cp
&& isspace(cp
[-1]))
1541 int log_ref_setup(const char *refname
, char *logfile
, int bufsize
)
1543 int logfd
, oflags
= O_APPEND
| O_WRONLY
;
1545 git_snpath(logfile
, bufsize
, "logs/%s", refname
);
1546 if (log_all_ref_updates
&&
1547 (!prefixcmp(refname
, "refs/heads/") ||
1548 !prefixcmp(refname
, "refs/remotes/") ||
1549 !prefixcmp(refname
, "refs/notes/") ||
1550 !strcmp(refname
, "HEAD"))) {
1551 if (safe_create_leading_directories(logfile
) < 0)
1552 return error("unable to create directory for %s",
1557 logfd
= open(logfile
, oflags
, 0666);
1559 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1562 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1563 if (remove_empty_directories(logfile
)) {
1564 return error("There are still logs under '%s'",
1567 logfd
= open(logfile
, oflags
, 0666);
1571 return error("Unable to append to %s: %s",
1572 logfile
, strerror(errno
));
1575 adjust_shared_perm(logfile
);
1580 static int log_ref_write(const char *refname
, const unsigned char *old_sha1
,
1581 const unsigned char *new_sha1
, const char *msg
)
1583 int logfd
, result
, written
, oflags
= O_APPEND
| O_WRONLY
;
1584 unsigned maxlen
, len
;
1586 char log_file
[PATH_MAX
];
1588 const char *committer
;
1590 if (log_all_ref_updates
< 0)
1591 log_all_ref_updates
= !is_bare_repository();
1593 result
= log_ref_setup(refname
, log_file
, sizeof(log_file
));
1597 logfd
= open(log_file
, oflags
);
1600 msglen
= msg
? strlen(msg
) : 0;
1601 committer
= git_committer_info(0);
1602 maxlen
= strlen(committer
) + msglen
+ 100;
1603 logrec
= xmalloc(maxlen
);
1604 len
= sprintf(logrec
, "%s %s %s\n",
1605 sha1_to_hex(old_sha1
),
1606 sha1_to_hex(new_sha1
),
1609 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1610 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1612 if (close(logfd
) != 0 || written
!= len
)
1613 return error("Unable to append to %s", log_file
);
1617 static int is_branch(const char *refname
)
1619 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1622 int write_ref_sha1(struct ref_lock
*lock
,
1623 const unsigned char *sha1
, const char *logmsg
)
1625 static char term
= '\n';
1630 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1634 o
= parse_object(sha1
);
1636 error("Trying to write ref %s with nonexistent object %s",
1637 lock
->ref_name
, sha1_to_hex(sha1
));
1641 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1642 error("Trying to write non-commit object %s to branch %s",
1643 sha1_to_hex(sha1
), lock
->ref_name
);
1647 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1648 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1649 || close_ref(lock
) < 0) {
1650 error("Couldn't write %s", lock
->lk
->filename
);
1654 clear_loose_ref_cache(get_ref_cache(NULL
));
1655 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1656 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1657 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1661 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1663 * Special hack: If a branch is updated directly and HEAD
1664 * points to it (may happen on the remote side of a push
1665 * for example) then logically the HEAD reflog should be
1667 * A generic solution implies reverse symref information,
1668 * but finding all symrefs pointing to the given branch
1669 * would be rather costly for this rare event (the direct
1670 * update of a branch) to be worth it. So let's cheat and
1671 * check with HEAD only which should cover 99% of all usage
1672 * scenarios (even 100% of the default ones).
1674 unsigned char head_sha1
[20];
1676 const char *head_ref
;
1677 head_ref
= resolve_ref("HEAD", head_sha1
, 1, &head_flag
);
1678 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1679 !strcmp(head_ref
, lock
->ref_name
))
1680 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1682 if (commit_ref(lock
)) {
1683 error("Couldn't set %s", lock
->ref_name
);
1691 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1694 const char *lockpath
;
1696 int fd
, len
, written
;
1697 char *git_HEAD
= git_pathdup("%s", ref_target
);
1698 unsigned char old_sha1
[20], new_sha1
[20];
1700 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1703 if (safe_create_leading_directories(git_HEAD
) < 0)
1704 return error("unable to create directory for %s", git_HEAD
);
1706 #ifndef NO_SYMLINK_HEAD
1707 if (prefer_symlink_refs
) {
1709 if (!symlink(refs_heads_master
, git_HEAD
))
1711 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1715 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1716 if (sizeof(ref
) <= len
) {
1717 error("refname too long: %s", refs_heads_master
);
1718 goto error_free_return
;
1720 lockpath
= mkpath("%s.lock", git_HEAD
);
1721 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1723 error("Unable to open %s for writing", lockpath
);
1724 goto error_free_return
;
1726 written
= write_in_full(fd
, ref
, len
);
1727 if (close(fd
) != 0 || written
!= len
) {
1728 error("Unable to write to %s", lockpath
);
1729 goto error_unlink_return
;
1731 if (rename(lockpath
, git_HEAD
) < 0) {
1732 error("Unable to create %s", git_HEAD
);
1733 goto error_unlink_return
;
1735 if (adjust_shared_perm(git_HEAD
)) {
1736 error("Unable to fix permissions on %s", lockpath
);
1737 error_unlink_return
:
1738 unlink_or_warn(lockpath
);
1744 #ifndef NO_SYMLINK_HEAD
1747 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1748 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1754 static char *ref_msg(const char *line
, const char *endp
)
1758 ep
= memchr(line
, '\n', endp
- line
);
1761 return xmemdupz(line
, ep
- line
);
1764 int read_ref_at(const char *refname
, unsigned long at_time
, int cnt
,
1765 unsigned char *sha1
, char **msg
,
1766 unsigned long *cutoff_time
, int *cutoff_tz
, int *cutoff_cnt
)
1768 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1770 int logfd
, tz
, reccnt
= 0;
1773 unsigned char logged_sha1
[20];
1777 logfile
= git_path("logs/%s", refname
);
1778 logfd
= open(logfile
, O_RDONLY
, 0);
1780 die_errno("Unable to read log '%s'", logfile
);
1783 die("Log %s is empty.", logfile
);
1784 mapsz
= xsize_t(st
.st_size
);
1785 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1786 logdata
= log_mapped
;
1790 rec
= logend
= logdata
+ st
.st_size
;
1791 while (logdata
< rec
) {
1793 if (logdata
< rec
&& *(rec
-1) == '\n')
1796 while (logdata
< rec
&& *(rec
-1) != '\n') {
1802 die("Log %s is corrupt.", logfile
);
1803 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1804 if (date
<= at_time
|| cnt
== 0) {
1805 tz
= strtoul(tz_c
, NULL
, 10);
1807 *msg
= ref_msg(rec
, logend
);
1809 *cutoff_time
= date
;
1813 *cutoff_cnt
= reccnt
- 1;
1815 if (get_sha1_hex(lastrec
, logged_sha1
))
1816 die("Log %s is corrupt.", logfile
);
1817 if (get_sha1_hex(rec
+ 41, sha1
))
1818 die("Log %s is corrupt.", logfile
);
1819 if (hashcmp(logged_sha1
, sha1
)) {
1820 warning("Log %s has gap after %s.",
1821 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1824 else if (date
== at_time
) {
1825 if (get_sha1_hex(rec
+ 41, sha1
))
1826 die("Log %s is corrupt.", logfile
);
1829 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1830 die("Log %s is corrupt.", logfile
);
1831 if (hashcmp(logged_sha1
, sha1
)) {
1832 warning("Log %s unexpectedly ended on %s.",
1833 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1836 munmap(log_mapped
, mapsz
);
1845 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1847 if (rec
== logend
|| *rec
== '\n')
1848 die("Log %s is corrupt.", logfile
);
1849 date
= strtoul(rec
+ 1, &tz_c
, 10);
1850 tz
= strtoul(tz_c
, NULL
, 10);
1851 if (get_sha1_hex(logdata
, sha1
))
1852 die("Log %s is corrupt.", logfile
);
1853 if (is_null_sha1(sha1
)) {
1854 if (get_sha1_hex(logdata
+ 41, sha1
))
1855 die("Log %s is corrupt.", logfile
);
1858 *msg
= ref_msg(logdata
, logend
);
1859 munmap(log_mapped
, mapsz
);
1862 *cutoff_time
= date
;
1866 *cutoff_cnt
= reccnt
;
1870 int for_each_recent_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1872 const char *logfile
;
1874 struct strbuf sb
= STRBUF_INIT
;
1877 logfile
= git_path("logs/%s", refname
);
1878 logfp
= fopen(logfile
, "r");
1883 struct stat statbuf
;
1884 if (fstat(fileno(logfp
), &statbuf
) ||
1885 statbuf
.st_size
< ofs
||
1886 fseek(logfp
, -ofs
, SEEK_END
) ||
1887 strbuf_getwholeline(&sb
, logfp
, '\n')) {
1889 strbuf_release(&sb
);
1894 while (!strbuf_getwholeline(&sb
, logfp
, '\n')) {
1895 unsigned char osha1
[20], nsha1
[20];
1896 char *email_end
, *message
;
1897 unsigned long timestamp
;
1900 /* old SP new SP name <email> SP time TAB msg LF */
1901 if (sb
.len
< 83 || sb
.buf
[sb
.len
- 1] != '\n' ||
1902 get_sha1_hex(sb
.buf
, osha1
) || sb
.buf
[40] != ' ' ||
1903 get_sha1_hex(sb
.buf
+ 41, nsha1
) || sb
.buf
[81] != ' ' ||
1904 !(email_end
= strchr(sb
.buf
+ 82, '>')) ||
1905 email_end
[1] != ' ' ||
1906 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1907 !message
|| message
[0] != ' ' ||
1908 (message
[1] != '+' && message
[1] != '-') ||
1909 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1910 !isdigit(message
[4]) || !isdigit(message
[5]))
1911 continue; /* corrupt? */
1912 email_end
[1] = '\0';
1913 tz
= strtol(message
+ 1, NULL
, 10);
1914 if (message
[6] != '\t')
1918 ret
= fn(osha1
, nsha1
, sb
.buf
+ 82, timestamp
, tz
, message
,
1924 strbuf_release(&sb
);
1928 int for_each_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, void *cb_data
)
1930 return for_each_recent_reflog_ent(refname
, fn
, 0, cb_data
);
1933 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
1935 DIR *dir
= opendir(git_path("logs/%s", base
));
1940 int baselen
= strlen(base
);
1941 char *log
= xmalloc(baselen
+ 257);
1943 memcpy(log
, base
, baselen
);
1944 if (baselen
&& base
[baselen
-1] != '/')
1945 log
[baselen
++] = '/';
1947 while ((de
= readdir(dir
)) != NULL
) {
1951 if (de
->d_name
[0] == '.')
1953 namelen
= strlen(de
->d_name
);
1956 if (has_extension(de
->d_name
, ".lock"))
1958 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
1959 if (stat(git_path("logs/%s", log
), &st
) < 0)
1961 if (S_ISDIR(st
.st_mode
)) {
1962 retval
= do_for_each_reflog(log
, fn
, cb_data
);
1964 unsigned char sha1
[20];
1965 if (read_ref_full(log
, sha1
, 0, NULL
))
1966 retval
= error("bad ref for %s", log
);
1968 retval
= fn(log
, sha1
, 0, cb_data
);
1981 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
1983 return do_for_each_reflog("", fn
, cb_data
);
1986 int update_ref(const char *action
, const char *refname
,
1987 const unsigned char *sha1
, const unsigned char *oldval
,
1988 int flags
, enum action_on_err onerr
)
1990 static struct ref_lock
*lock
;
1991 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
1993 const char *str
= "Cannot lock the ref '%s'.";
1995 case MSG_ON_ERR
: error(str
, refname
); break;
1996 case DIE_ON_ERR
: die(str
, refname
); break;
1997 case QUIET_ON_ERR
: break;
2001 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
2002 const char *str
= "Cannot update 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;
2013 int ref_exists(const char *refname
)
2015 unsigned char sha1
[20];
2016 return !!resolve_ref(refname
, sha1
, 1, NULL
);
2019 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
2021 for ( ; list
; list
= list
->next
)
2022 if (!strcmp(list
->name
, name
))
2023 return (struct ref
*)list
;
2028 * generate a format suitable for scanf from a ref_rev_parse_rules
2029 * rule, that is replace the "%.*s" spec with a "%s" spec
2031 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
2035 spec
= strstr(rule
, "%.*s");
2036 if (!spec
|| strstr(spec
+ 4, "%.*s"))
2037 die("invalid rule in ref_rev_parse_rules: %s", rule
);
2039 /* copy all until spec */
2040 strncpy(scanf_fmt
, rule
, spec
- rule
);
2041 scanf_fmt
[spec
- rule
] = '\0';
2043 strcat(scanf_fmt
, "%s");
2044 /* copy remaining rule */
2045 strcat(scanf_fmt
, spec
+ 4);
2050 char *shorten_unambiguous_ref(const char *refname
, int strict
)
2053 static char **scanf_fmts
;
2054 static int nr_rules
;
2057 /* pre generate scanf formats from ref_rev_parse_rules[] */
2059 size_t total_len
= 0;
2061 /* the rule list is NULL terminated, count them first */
2062 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
2063 /* no +1 because strlen("%s") < strlen("%.*s") */
2064 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
2066 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
2069 for (i
= 0; i
< nr_rules
; i
++) {
2070 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
2072 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
2073 total_len
+= strlen(ref_rev_parse_rules
[i
]);
2077 /* bail out if there are no rules */
2079 return xstrdup(refname
);
2081 /* buffer for scanf result, at most refname must fit */
2082 short_name
= xstrdup(refname
);
2084 /* skip first rule, it will always match */
2085 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
2087 int rules_to_fail
= i
;
2090 if (1 != sscanf(refname
, scanf_fmts
[i
], short_name
))
2093 short_name_len
= strlen(short_name
);
2096 * in strict mode, all (except the matched one) rules
2097 * must fail to resolve to a valid non-ambiguous ref
2100 rules_to_fail
= nr_rules
;
2103 * check if the short name resolves to a valid ref,
2104 * but use only rules prior to the matched one
2106 for (j
= 0; j
< rules_to_fail
; j
++) {
2107 const char *rule
= ref_rev_parse_rules
[j
];
2108 char refname
[PATH_MAX
];
2110 /* skip matched rule */
2115 * the short name is ambiguous, if it resolves
2116 * (with this previous rule) to a valid ref
2117 * read_ref() returns 0 on success
2119 mksnpath(refname
, sizeof(refname
),
2120 rule
, short_name_len
, short_name
);
2121 if (ref_exists(refname
))
2126 * short name is non-ambiguous if all previous rules
2127 * haven't resolved to a valid ref
2129 if (j
== rules_to_fail
)
2134 return xstrdup(refname
);