7 /* ISSYMREF=0x01, ISPACKED=0x02 and ISBROKEN=0x04 are public interfaces */
8 #define REF_KNOWS_PEELED 0x10
11 unsigned char flag
; /* ISSYMREF? ISPACKED? */
12 unsigned char sha1
[20];
13 unsigned char peeled
[20];
14 /* The full name of the reference (e.g., "refs/heads/master"): */
15 char name
[FLEX_ARRAY
];
20 struct ref_entry
**refs
;
24 * Parse one line from a packed-refs file. Write the SHA1 to sha1.
25 * Return a pointer to the refname within the line (null-terminated),
26 * or NULL if there was a problem.
28 static const char *parse_ref_line(char *line
, unsigned char *sha1
)
31 * 42: the answer to everything.
33 * In this case, it happens to be the answer to
34 * 40 (length of sha1 hex representation)
35 * +1 (space in between hex and name)
36 * +1 (newline at the end of the line)
38 int len
= strlen(line
) - 42;
42 if (get_sha1_hex(line
, sha1
) < 0)
44 if (!isspace(line
[40]))
49 if (line
[len
] != '\n')
56 static void add_ref(const char *refname
, const unsigned char *sha1
,
57 int flag
, int check_name
, struct ref_array
*refs
,
58 struct ref_entry
**new_entry
)
61 struct ref_entry
*entry
;
63 /* Allocate it and add it in.. */
64 len
= strlen(refname
) + 1;
65 entry
= xmalloc(sizeof(struct ref_entry
) + len
);
66 hashcpy(entry
->sha1
, sha1
);
67 hashclr(entry
->peeled
);
69 check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
|REFNAME_DOT_COMPONENT
))
70 die("Reference has invalid format: '%s'", refname
);
71 memcpy(entry
->name
, refname
, len
);
75 ALLOC_GROW(refs
->refs
, refs
->nr
+ 1, refs
->alloc
);
76 refs
->refs
[refs
->nr
++] = entry
;
79 static int ref_entry_cmp(const void *a
, const void *b
)
81 struct ref_entry
*one
= *(struct ref_entry
**)a
;
82 struct ref_entry
*two
= *(struct ref_entry
**)b
;
83 return strcmp(one
->name
, two
->name
);
86 static void sort_ref_array(struct ref_array
*array
)
90 /* Nothing to sort unless there are at least two entries */
94 qsort(array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
96 /* Remove any duplicates from the ref_array */
97 for (; j
< array
->nr
; j
++) {
98 struct ref_entry
*a
= array
->refs
[i
];
99 struct ref_entry
*b
= array
->refs
[j
];
100 if (!strcmp(a
->name
, b
->name
)) {
101 if (hashcmp(a
->sha1
, b
->sha1
))
102 die("Duplicated ref, and SHA1s don't match: %s",
104 warning("Duplicated ref: %s", a
->name
);
109 array
->refs
[i
] = array
->refs
[j
];
114 static struct ref_entry
*search_ref_array(struct ref_array
*array
, const char *refname
)
116 struct ref_entry
*e
, **r
;
125 len
= strlen(refname
) + 1;
126 e
= xmalloc(sizeof(struct ref_entry
) + len
);
127 memcpy(e
->name
, refname
, len
);
129 r
= bsearch(&e
, array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
140 * Future: need to be in "struct repository"
141 * when doing a full libification.
143 static struct ref_cache
{
144 struct ref_cache
*next
;
147 struct ref_array loose
;
148 struct ref_array packed
;
149 /* The submodule name, or "" for the main repo. */
150 char name
[FLEX_ARRAY
];
153 static struct ref_entry
*current_ref
;
155 static struct ref_array extra_refs
;
157 static void clear_ref_array(struct ref_array
*array
)
160 for (i
= 0; i
< array
->nr
; i
++)
161 free(array
->refs
[i
]);
163 array
->nr
= array
->alloc
= 0;
167 static void clear_packed_ref_cache(struct ref_cache
*refs
)
169 if (refs
->did_packed
)
170 clear_ref_array(&refs
->packed
);
171 refs
->did_packed
= 0;
174 static void clear_loose_ref_cache(struct ref_cache
*refs
)
177 clear_ref_array(&refs
->loose
);
181 static struct ref_cache
*create_ref_cache(const char *submodule
)
184 struct ref_cache
*refs
;
187 len
= strlen(submodule
) + 1;
188 refs
= xcalloc(1, sizeof(struct ref_cache
) + len
);
189 memcpy(refs
->name
, submodule
, len
);
194 * Return a pointer to a ref_cache for the specified submodule. For
195 * the main repository, use submodule==NULL. The returned structure
196 * will be allocated and initialized but not necessarily populated; it
197 * should not be freed.
199 static struct ref_cache
*get_ref_cache(const char *submodule
)
201 struct ref_cache
*refs
= ref_cache
;
205 if (!strcmp(submodule
, refs
->name
))
210 refs
= create_ref_cache(submodule
);
211 refs
->next
= ref_cache
;
216 void invalidate_ref_cache(const char *submodule
)
218 struct ref_cache
*refs
= get_ref_cache(submodule
);
219 clear_packed_ref_cache(refs
);
220 clear_loose_ref_cache(refs
);
223 static void read_packed_refs(FILE *f
, struct ref_array
*array
)
225 struct ref_entry
*last
= NULL
;
226 char refline
[PATH_MAX
];
227 int flag
= REF_ISPACKED
;
229 while (fgets(refline
, sizeof(refline
), f
)) {
230 unsigned char sha1
[20];
232 static const char header
[] = "# pack-refs with:";
234 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
235 const char *traits
= refline
+ sizeof(header
) - 1;
236 if (strstr(traits
, " peeled "))
237 flag
|= REF_KNOWS_PEELED
;
238 /* perhaps other traits later as well */
242 refname
= parse_ref_line(refline
, sha1
);
244 add_ref(refname
, sha1
, flag
, 1, array
, &last
);
249 strlen(refline
) == 42 &&
250 refline
[41] == '\n' &&
251 !get_sha1_hex(refline
+ 1, sha1
))
252 hashcpy(last
->peeled
, sha1
);
254 sort_ref_array(array
);
257 void add_extra_ref(const char *refname
, const unsigned char *sha1
, int flag
)
259 add_ref(refname
, sha1
, flag
, 0, &extra_refs
, NULL
);
262 void clear_extra_refs(void)
264 clear_ref_array(&extra_refs
);
267 static struct ref_array
*get_packed_refs(const char *submodule
)
269 struct ref_cache
*refs
= get_ref_cache(submodule
);
271 if (!refs
->did_packed
) {
272 const char *packed_refs_file
;
276 packed_refs_file
= git_path_submodule(submodule
, "packed-refs");
278 packed_refs_file
= git_path("packed-refs");
279 f
= fopen(packed_refs_file
, "r");
281 read_packed_refs(f
, &refs
->packed
);
284 refs
->did_packed
= 1;
286 return &refs
->packed
;
289 static void get_ref_dir(const char *submodule
, const char *base
,
290 struct ref_array
*array
)
296 path
= git_path_submodule(submodule
, "%s", base
);
298 path
= git_path("%s", base
);
305 int baselen
= strlen(base
);
306 char *refname
= xmalloc(baselen
+ 257);
308 memcpy(refname
, base
, baselen
);
309 if (baselen
&& base
[baselen
-1] != '/')
310 refname
[baselen
++] = '/';
312 while ((de
= readdir(dir
)) != NULL
) {
313 unsigned char sha1
[20];
319 if (de
->d_name
[0] == '.')
321 namelen
= strlen(de
->d_name
);
324 if (has_extension(de
->d_name
, ".lock"))
326 memcpy(refname
+ baselen
, de
->d_name
, namelen
+1);
328 ? git_path_submodule(submodule
, "%s", refname
)
329 : git_path("%s", refname
);
330 if (stat(refdir
, &st
) < 0)
332 if (S_ISDIR(st
.st_mode
)) {
333 get_ref_dir(submodule
, refname
, array
);
339 if (resolve_gitlink_ref(submodule
, refname
, sha1
) < 0) {
341 flag
|= REF_ISBROKEN
;
343 } else if (read_ref_full(refname
, sha1
, 1, &flag
)) {
345 flag
|= REF_ISBROKEN
;
347 add_ref(refname
, sha1
, flag
, 1, array
, NULL
);
354 struct warn_if_dangling_data
{
360 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
361 int flags
, void *cb_data
)
363 struct warn_if_dangling_data
*d
= cb_data
;
364 const char *resolves_to
;
365 unsigned char junk
[20];
367 if (!(flags
& REF_ISSYMREF
))
370 resolves_to
= resolve_ref(refname
, junk
, 0, NULL
);
371 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
374 fprintf(d
->fp
, d
->msg_fmt
, refname
);
378 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
380 struct warn_if_dangling_data data
;
383 data
.refname
= refname
;
384 data
.msg_fmt
= msg_fmt
;
385 for_each_rawref(warn_if_dangling_symref
, &data
);
388 static struct ref_array
*get_loose_refs(const char *submodule
)
390 struct ref_cache
*refs
= get_ref_cache(submodule
);
392 if (!refs
->did_loose
) {
393 get_ref_dir(submodule
, "refs", &refs
->loose
);
394 sort_ref_array(&refs
->loose
);
400 /* We allow "recursive" symbolic refs. Only within reason, though */
402 #define MAXREFLEN (1024)
405 * Called by resolve_gitlink_ref_recursive() after it failed to read
406 * from "name", which is "module/.git/<refname>". Find <refname> in
407 * the packed-refs file for the submodule.
409 static int resolve_gitlink_packed_ref(char *name
, int pathlen
,
410 const char *refname
, unsigned char *sha1
)
413 struct ref_entry
*ref
;
414 struct ref_array
*array
;
416 /* being defensive: resolve_gitlink_ref() did this for us */
417 if (pathlen
< 6 || memcmp(name
+ pathlen
- 6, "/.git/", 6))
419 name
[pathlen
- 6] = '\0'; /* make it path to the submodule */
420 array
= get_packed_refs(name
);
421 ref
= search_ref_array(array
, refname
);
423 memcpy(sha1
, ref
->sha1
, 20);
429 static int resolve_gitlink_ref_recursive(char *name
, int pathlen
,
430 const char *refname
, unsigned char *sha1
,
433 int fd
, len
= strlen(refname
);
434 char buffer
[128], *p
;
436 if (recursion
> MAXDEPTH
|| len
> MAXREFLEN
)
438 memcpy(name
+ pathlen
, refname
, len
+1);
439 fd
= open(name
, O_RDONLY
);
441 return resolve_gitlink_packed_ref(name
, pathlen
, refname
, sha1
);
443 len
= read(fd
, buffer
, sizeof(buffer
)-1);
447 while (len
&& isspace(buffer
[len
-1]))
451 /* Was it a detached head or an old-fashioned symlink? */
452 if (!get_sha1_hex(buffer
, sha1
))
456 if (strncmp(buffer
, "ref:", 4))
462 return resolve_gitlink_ref_recursive(name
, pathlen
, p
, sha1
, recursion
+1);
465 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *sha1
)
467 int len
= strlen(path
), retval
;
471 while (len
&& path
[len
-1] == '/')
475 gitdir
= xmalloc(len
+ MAXREFLEN
+ 8);
476 memcpy(gitdir
, path
, len
);
477 memcpy(gitdir
+ len
, "/.git", 6);
480 tmp
= read_gitfile(gitdir
);
484 gitdir
= xmalloc(len
+ MAXREFLEN
+ 3);
485 memcpy(gitdir
, tmp
, len
);
488 gitdir
[++len
] = '\0';
489 retval
= resolve_gitlink_ref_recursive(gitdir
, len
, refname
, sha1
, 0);
495 * Try to read ref from the packed references. On success, set sha1
496 * and return 0; otherwise, return -1.
498 static int get_packed_ref(const char *refname
, unsigned char *sha1
)
500 struct ref_array
*packed
= get_packed_refs(NULL
);
501 struct ref_entry
*entry
= search_ref_array(packed
, refname
);
503 hashcpy(sha1
, entry
->sha1
);
509 const char *resolve_ref(const char *refname
, unsigned char *sha1
, int reading
, int *flag
)
511 int depth
= MAXDEPTH
;
514 static char refname_buffer
[256];
519 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
531 git_snpath(path
, sizeof(path
), "%s", refname
);
533 if (lstat(path
, &st
) < 0) {
537 * The loose reference file does not exist;
538 * check for a packed reference.
540 if (!get_packed_ref(refname
, sha1
)) {
542 *flag
|= REF_ISPACKED
;
545 /* The reference is not a packed reference, either. */
554 /* Follow "normalized" - ie "refs/.." symlinks by hand */
555 if (S_ISLNK(st
.st_mode
)) {
556 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
560 if (!prefixcmp(buffer
, "refs/") &&
561 !check_refname_format(buffer
, 0)) {
562 strcpy(refname_buffer
, buffer
);
563 refname
= refname_buffer
;
565 *flag
|= REF_ISSYMREF
;
570 /* Is it a directory? */
571 if (S_ISDIR(st
.st_mode
)) {
577 * Anything else, just open it and try to use it as
580 fd
= open(path
, O_RDONLY
);
583 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
587 while (len
&& isspace(buffer
[len
-1]))
592 * Is it a symbolic ref?
594 if (prefixcmp(buffer
, "ref:"))
597 *flag
|= REF_ISSYMREF
;
599 while (isspace(*buf
))
601 if (check_refname_format(buf
, REFNAME_ALLOW_ONELEVEL
)) {
603 *flag
|= REF_ISBROKEN
;
606 refname
= strcpy(refname_buffer
, buf
);
608 /* Please note that FETCH_HEAD has a second line containing other data. */
609 if (get_sha1_hex(buffer
, sha1
) || (buffer
[40] != '\0' && !isspace(buffer
[40]))) {
611 *flag
|= REF_ISBROKEN
;
617 /* The argument to filter_refs */
624 int read_ref_full(const char *refname
, unsigned char *sha1
, int reading
, int *flags
)
626 if (resolve_ref(refname
, sha1
, reading
, flags
))
631 int read_ref(const char *refname
, unsigned char *sha1
)
633 return read_ref_full(refname
, sha1
, 1, NULL
);
636 #define DO_FOR_EACH_INCLUDE_BROKEN 01
637 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
638 int flags
, void *cb_data
, struct ref_entry
*entry
)
640 if (prefixcmp(entry
->name
, base
))
643 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
644 if (entry
->flag
& REF_ISBROKEN
)
645 return 0; /* ignore broken refs e.g. dangling symref */
646 if (!has_sha1_file(entry
->sha1
)) {
647 error("%s does not point to a valid object!", entry
->name
);
652 return fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
655 static int filter_refs(const char *refname
, const unsigned char *sha1
, int flags
,
658 struct ref_filter
*filter
= (struct ref_filter
*)data
;
659 if (fnmatch(filter
->pattern
, refname
, 0))
661 return filter
->fn(refname
, sha1
, flags
, filter
->cb_data
);
664 int peel_ref(const char *refname
, unsigned char *sha1
)
667 unsigned char base
[20];
670 if (current_ref
&& (current_ref
->name
== refname
671 || !strcmp(current_ref
->name
, refname
))) {
672 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
673 hashcpy(sha1
, current_ref
->peeled
);
676 hashcpy(base
, current_ref
->sha1
);
680 if (read_ref_full(refname
, base
, 1, &flag
))
683 if ((flag
& REF_ISPACKED
)) {
684 struct ref_array
*array
= get_packed_refs(NULL
);
685 struct ref_entry
*r
= search_ref_array(array
, refname
);
687 if (r
!= NULL
&& r
->flag
& REF_KNOWS_PEELED
) {
688 hashcpy(sha1
, r
->peeled
);
694 o
= parse_object(base
);
695 if (o
&& o
->type
== OBJ_TAG
) {
696 o
= deref_tag(o
, refname
, 0);
698 hashcpy(sha1
, o
->sha1
);
705 static int do_for_each_ref(const char *submodule
, const char *base
, each_ref_fn fn
,
706 int trim
, int flags
, void *cb_data
)
708 int retval
= 0, i
, p
= 0, l
= 0;
709 struct ref_array
*packed
= get_packed_refs(submodule
);
710 struct ref_array
*loose
= get_loose_refs(submodule
);
712 struct ref_array
*extra
= &extra_refs
;
714 for (i
= 0; i
< extra
->nr
; i
++)
715 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, extra
->refs
[i
]);
717 while (p
< packed
->nr
&& l
< loose
->nr
) {
718 struct ref_entry
*entry
;
719 int cmp
= strcmp(packed
->refs
[p
]->name
, loose
->refs
[l
]->name
);
725 entry
= loose
->refs
[l
++];
727 entry
= packed
->refs
[p
++];
729 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, entry
);
739 for (; p
< packed
->nr
; p
++) {
740 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, packed
->refs
[p
]);
751 static int do_head_ref(const char *submodule
, each_ref_fn fn
, void *cb_data
)
753 unsigned char sha1
[20];
757 if (resolve_gitlink_ref(submodule
, "HEAD", sha1
) == 0)
758 return fn("HEAD", sha1
, 0, cb_data
);
763 if (!read_ref_full("HEAD", sha1
, 1, &flag
))
764 return fn("HEAD", sha1
, flag
, cb_data
);
769 int head_ref(each_ref_fn fn
, void *cb_data
)
771 return do_head_ref(NULL
, fn
, cb_data
);
774 int head_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
776 return do_head_ref(submodule
, fn
, cb_data
);
779 int for_each_ref(each_ref_fn fn
, void *cb_data
)
781 return do_for_each_ref(NULL
, "", fn
, 0, 0, cb_data
);
784 int for_each_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
786 return do_for_each_ref(submodule
, "", fn
, 0, 0, cb_data
);
789 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
791 return do_for_each_ref(NULL
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
794 int for_each_ref_in_submodule(const char *submodule
, const char *prefix
,
795 each_ref_fn fn
, void *cb_data
)
797 return do_for_each_ref(submodule
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
800 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
802 return for_each_ref_in("refs/tags/", fn
, cb_data
);
805 int for_each_tag_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
807 return for_each_ref_in_submodule(submodule
, "refs/tags/", fn
, cb_data
);
810 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
812 return for_each_ref_in("refs/heads/", fn
, cb_data
);
815 int for_each_branch_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
817 return for_each_ref_in_submodule(submodule
, "refs/heads/", fn
, cb_data
);
820 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
822 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
825 int for_each_remote_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
827 return for_each_ref_in_submodule(submodule
, "refs/remotes/", fn
, cb_data
);
830 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
832 return do_for_each_ref(NULL
, "refs/replace/", fn
, 13, 0, cb_data
);
835 int head_ref_namespaced(each_ref_fn fn
, void *cb_data
)
837 struct strbuf buf
= STRBUF_INIT
;
839 unsigned char sha1
[20];
842 strbuf_addf(&buf
, "%sHEAD", get_git_namespace());
843 if (!read_ref_full(buf
.buf
, sha1
, 1, &flag
))
844 ret
= fn(buf
.buf
, sha1
, flag
, cb_data
);
845 strbuf_release(&buf
);
850 int for_each_namespaced_ref(each_ref_fn fn
, void *cb_data
)
852 struct strbuf buf
= STRBUF_INIT
;
854 strbuf_addf(&buf
, "%srefs/", get_git_namespace());
855 ret
= do_for_each_ref(NULL
, buf
.buf
, fn
, 0, 0, cb_data
);
856 strbuf_release(&buf
);
860 int for_each_glob_ref_in(each_ref_fn fn
, const char *pattern
,
861 const char *prefix
, void *cb_data
)
863 struct strbuf real_pattern
= STRBUF_INIT
;
864 struct ref_filter filter
;
867 if (!prefix
&& prefixcmp(pattern
, "refs/"))
868 strbuf_addstr(&real_pattern
, "refs/");
870 strbuf_addstr(&real_pattern
, prefix
);
871 strbuf_addstr(&real_pattern
, pattern
);
873 if (!has_glob_specials(pattern
)) {
874 /* Append implied '/' '*' if not present. */
875 if (real_pattern
.buf
[real_pattern
.len
- 1] != '/')
876 strbuf_addch(&real_pattern
, '/');
877 /* No need to check for '*', there is none. */
878 strbuf_addch(&real_pattern
, '*');
881 filter
.pattern
= real_pattern
.buf
;
883 filter
.cb_data
= cb_data
;
884 ret
= for_each_ref(filter_refs
, &filter
);
886 strbuf_release(&real_pattern
);
890 int for_each_glob_ref(each_ref_fn fn
, const char *pattern
, void *cb_data
)
892 return for_each_glob_ref_in(fn
, pattern
, NULL
, cb_data
);
895 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
897 return do_for_each_ref(NULL
, "", fn
, 0,
898 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
902 * Make sure "ref" is something reasonable to have under ".git/refs/";
903 * We do not like it if:
905 * - any path component of it begins with ".", or
906 * - it has double dots "..", or
907 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
908 * - it ends with a "/".
909 * - it ends with ".lock"
910 * - it contains a "\" (backslash)
913 /* Return true iff ch is not allowed in reference names. */
914 static inline int bad_ref_char(int ch
)
916 if (((unsigned) ch
) <= ' ' || ch
== 0x7f ||
917 ch
== '~' || ch
== '^' || ch
== ':' || ch
== '\\')
919 /* 2.13 Pattern Matching Notation */
920 if (ch
== '*' || ch
== '?' || ch
== '[') /* Unsupported */
926 * Try to read one refname component from the front of refname. Return
927 * the length of the component found, or -1 if the component is not
930 static int check_refname_component(const char *refname
, int flags
)
935 for (cp
= refname
; ; cp
++) {
937 if (ch
== '\0' || ch
== '/')
939 if (bad_ref_char(ch
))
940 return -1; /* Illegal character in refname. */
941 if (last
== '.' && ch
== '.')
942 return -1; /* Refname contains "..". */
943 if (last
== '@' && ch
== '{')
944 return -1; /* Refname contains "@{". */
948 return -1; /* Component has zero length. */
949 if (refname
[0] == '.') {
950 if (!(flags
& REFNAME_DOT_COMPONENT
))
951 return -1; /* Component starts with '.'. */
953 * Even if leading dots are allowed, don't allow "."
954 * as a component (".." is prevented by a rule above).
956 if (refname
[1] == '\0')
957 return -1; /* Component equals ".". */
959 if (cp
- refname
>= 5 && !memcmp(cp
- 5, ".lock", 5))
960 return -1; /* Refname ends with ".lock". */
964 int check_refname_format(const char *refname
, int flags
)
966 int component_len
, component_count
= 0;
969 /* We are at the start of a path component. */
970 component_len
= check_refname_component(refname
, flags
);
971 if (component_len
< 0) {
972 if ((flags
& REFNAME_REFSPEC_PATTERN
) &&
974 (refname
[1] == '\0' || refname
[1] == '/')) {
975 /* Accept one wildcard as a full refname component. */
976 flags
&= ~REFNAME_REFSPEC_PATTERN
;
983 if (refname
[component_len
] == '\0')
985 /* Skip to next component. */
986 refname
+= component_len
+ 1;
989 if (refname
[component_len
- 1] == '.')
990 return -1; /* Refname ends with '.'. */
991 if (!(flags
& REFNAME_ALLOW_ONELEVEL
) && component_count
< 2)
992 return -1; /* Refname has only one component. */
996 const char *prettify_refname(const char *name
)
999 !prefixcmp(name
, "refs/heads/") ? 11 :
1000 !prefixcmp(name
, "refs/tags/") ? 10 :
1001 !prefixcmp(name
, "refs/remotes/") ? 13 :
1005 const char *ref_rev_parse_rules
[] = {
1010 "refs/remotes/%.*s",
1011 "refs/remotes/%.*s/HEAD",
1015 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
1018 const int abbrev_name_len
= strlen(abbrev_name
);
1020 for (p
= rules
; *p
; p
++) {
1021 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
1029 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
1030 const unsigned char *old_sha1
, int mustexist
)
1032 if (read_ref_full(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
1033 error("Can't verify ref %s", lock
->ref_name
);
1037 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
1038 error("Ref %s is at %s but expected %s", lock
->ref_name
,
1039 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
1046 static int remove_empty_directories(const char *file
)
1048 /* we want to create a file but there is a directory there;
1049 * if that is an empty directory (or a directory that contains
1050 * only empty directories), remove them.
1055 strbuf_init(&path
, 20);
1056 strbuf_addstr(&path
, file
);
1058 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
1060 strbuf_release(&path
);
1066 * Return true iff a reference named refname could be created without
1067 * conflicting with the name of an existing reference. If oldrefname
1068 * is non-NULL, ignore potential conflicts with oldrefname (e.g.,
1069 * because oldrefname is scheduled for deletion in the same
1072 static int is_refname_available(const char *refname
, const char *oldrefname
,
1073 struct ref_array
*array
)
1075 int i
, namlen
= strlen(refname
); /* e.g. 'foo/bar' */
1076 for (i
= 0; i
< array
->nr
; i
++ ) {
1077 struct ref_entry
*entry
= array
->refs
[i
];
1078 /* entry->name could be 'foo' or 'foo/bar/baz' */
1079 if (!oldrefname
|| strcmp(oldrefname
, entry
->name
)) {
1080 int len
= strlen(entry
->name
);
1081 int cmplen
= (namlen
< len
) ? namlen
: len
;
1082 const char *lead
= (namlen
< len
) ? entry
->name
: refname
;
1083 if (!strncmp(refname
, entry
->name
, cmplen
) &&
1084 lead
[cmplen
] == '/') {
1085 error("'%s' exists; cannot create '%s'",
1086 entry
->name
, refname
);
1095 * *string and *len will only be substituted, and *string returned (for
1096 * later free()ing) if the string passed in is a magic short-hand form
1099 static char *substitute_branch_name(const char **string
, int *len
)
1101 struct strbuf buf
= STRBUF_INIT
;
1102 int ret
= interpret_branch_name(*string
, &buf
);
1106 *string
= strbuf_detach(&buf
, &size
);
1108 return (char *)*string
;
1114 int dwim_ref(const char *str
, int len
, unsigned char *sha1
, char **ref
)
1116 char *last_branch
= substitute_branch_name(&str
, &len
);
1121 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1122 char fullref
[PATH_MAX
];
1123 unsigned char sha1_from_ref
[20];
1124 unsigned char *this_result
;
1127 this_result
= refs_found
? sha1_from_ref
: sha1
;
1128 mksnpath(fullref
, sizeof(fullref
), *p
, len
, str
);
1129 r
= resolve_ref(fullref
, this_result
, 1, &flag
);
1133 if (!warn_ambiguous_refs
)
1135 } else if ((flag
& REF_ISSYMREF
) && strcmp(fullref
, "HEAD")) {
1136 warning("ignoring dangling symref %s.", fullref
);
1137 } else if ((flag
& REF_ISBROKEN
) && strchr(fullref
, '/')) {
1138 warning("ignoring broken ref %s.", fullref
);
1145 int dwim_log(const char *str
, int len
, unsigned char *sha1
, char **log
)
1147 char *last_branch
= substitute_branch_name(&str
, &len
);
1152 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1154 unsigned char hash
[20];
1155 char path
[PATH_MAX
];
1156 const char *ref
, *it
;
1158 mksnpath(path
, sizeof(path
), *p
, len
, str
);
1159 ref
= resolve_ref(path
, hash
, 1, NULL
);
1162 if (!stat(git_path("logs/%s", path
), &st
) &&
1163 S_ISREG(st
.st_mode
))
1165 else if (strcmp(ref
, path
) &&
1166 !stat(git_path("logs/%s", ref
), &st
) &&
1167 S_ISREG(st
.st_mode
))
1171 if (!logs_found
++) {
1173 hashcpy(sha1
, hash
);
1175 if (!warn_ambiguous_refs
)
1182 static struct ref_lock
*lock_ref_sha1_basic(const char *refname
,
1183 const unsigned char *old_sha1
,
1184 int flags
, int *type_p
)
1187 const char *orig_refname
= refname
;
1188 struct ref_lock
*lock
;
1191 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1194 lock
= xcalloc(1, sizeof(struct ref_lock
));
1197 refname
= resolve_ref(refname
, lock
->old_sha1
, mustexist
, &type
);
1198 if (!refname
&& errno
== EISDIR
) {
1199 /* we are trying to lock foo but we used to
1200 * have foo/bar which now does not exist;
1201 * it is normal for the empty directory 'foo'
1204 ref_file
= git_path("%s", orig_refname
);
1205 if (remove_empty_directories(ref_file
)) {
1207 error("there are still refs under '%s'", orig_refname
);
1210 refname
= resolve_ref(orig_refname
, lock
->old_sha1
, mustexist
, &type
);
1216 error("unable to resolve reference %s: %s",
1217 orig_refname
, strerror(errno
));
1220 missing
= is_null_sha1(lock
->old_sha1
);
1221 /* When the ref did not exist and we are creating it,
1222 * make sure there is no existing ref that is packed
1223 * whose name begins with our refname, nor a ref whose
1224 * name is a proper prefix of our refname.
1227 !is_refname_available(refname
, NULL
, get_packed_refs(NULL
))) {
1228 last_errno
= ENOTDIR
;
1232 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1234 lflags
= LOCK_DIE_ON_ERROR
;
1235 if (flags
& REF_NODEREF
) {
1236 refname
= orig_refname
;
1237 lflags
|= LOCK_NODEREF
;
1239 lock
->ref_name
= xstrdup(refname
);
1240 lock
->orig_ref_name
= xstrdup(orig_refname
);
1241 ref_file
= git_path("%s", refname
);
1243 lock
->force_write
= 1;
1244 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
1245 lock
->force_write
= 1;
1247 if (safe_create_leading_directories(ref_file
)) {
1249 error("unable to create directory for %s", ref_file
);
1253 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
1254 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
1262 struct ref_lock
*lock_ref_sha1(const char *refname
, const unsigned char *old_sha1
)
1264 char refpath
[PATH_MAX
];
1265 if (check_refname_format(refname
, 0))
1267 strcpy(refpath
, mkpath("refs/%s", refname
));
1268 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
1271 struct ref_lock
*lock_any_ref_for_update(const char *refname
,
1272 const unsigned char *old_sha1
, int flags
)
1274 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
1276 return lock_ref_sha1_basic(refname
, old_sha1
, flags
, NULL
);
1279 static struct lock_file packlock
;
1281 static int repack_without_ref(const char *refname
)
1283 struct ref_array
*packed
;
1284 struct ref_entry
*ref
;
1287 packed
= get_packed_refs(NULL
);
1288 ref
= search_ref_array(packed
, refname
);
1291 fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
1293 unable_to_lock_error(git_path("packed-refs"), errno
);
1294 return error("cannot delete '%s' from packed refs", refname
);
1297 for (i
= 0; i
< packed
->nr
; i
++) {
1298 char line
[PATH_MAX
+ 100];
1301 ref
= packed
->refs
[i
];
1303 if (!strcmp(refname
, ref
->name
))
1305 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1306 sha1_to_hex(ref
->sha1
), ref
->name
);
1307 /* this should not happen but just being defensive */
1308 if (len
> sizeof(line
))
1309 die("too long a refname '%s'", ref
->name
);
1310 write_or_die(fd
, line
, len
);
1312 return commit_lock_file(&packlock
);
1315 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1317 struct ref_lock
*lock
;
1318 int err
, i
= 0, ret
= 0, flag
= 0;
1320 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1323 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1327 if (!(delopt
& REF_NODEREF
)) {
1328 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1329 lock
->lk
->filename
[i
] = 0;
1330 path
= lock
->lk
->filename
;
1332 path
= git_path("%s", refname
);
1334 err
= unlink_or_warn(path
);
1335 if (err
&& errno
!= ENOENT
)
1338 if (!(delopt
& REF_NODEREF
))
1339 lock
->lk
->filename
[i
] = '.';
1341 /* removing the loose one could have resurrected an earlier
1342 * packed one. Also, if it was not loose we need to repack
1345 ret
|= repack_without_ref(refname
);
1347 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1348 invalidate_ref_cache(NULL
);
1354 * People using contrib's git-new-workdir have .git/logs/refs ->
1355 * /some/other/path/.git/logs/refs, and that may live on another device.
1357 * IOW, to avoid cross device rename errors, the temporary renamed log must
1358 * live into logs/refs.
1360 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1362 int rename_ref(const char *oldrefname
, const char *newrefname
, const char *logmsg
)
1364 unsigned char sha1
[20], orig_sha1
[20];
1365 int flag
= 0, logmoved
= 0;
1366 struct ref_lock
*lock
;
1367 struct stat loginfo
;
1368 int log
= !lstat(git_path("logs/%s", oldrefname
), &loginfo
);
1369 const char *symref
= NULL
;
1371 if (log
&& S_ISLNK(loginfo
.st_mode
))
1372 return error("reflog for %s is a symlink", oldrefname
);
1374 symref
= resolve_ref(oldrefname
, orig_sha1
, 1, &flag
);
1375 if (flag
& REF_ISSYMREF
)
1376 return error("refname %s is a symbolic ref, renaming it is not supported",
1379 return error("refname %s not found", oldrefname
);
1381 if (!is_refname_available(newrefname
, oldrefname
, get_packed_refs(NULL
)))
1384 if (!is_refname_available(newrefname
, oldrefname
, get_loose_refs(NULL
)))
1387 if (log
&& rename(git_path("logs/%s", oldrefname
), git_path(TMP_RENAMED_LOG
)))
1388 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG
": %s",
1389 oldrefname
, strerror(errno
));
1391 if (delete_ref(oldrefname
, orig_sha1
, REF_NODEREF
)) {
1392 error("unable to delete old %s", oldrefname
);
1396 if (!read_ref_full(newrefname
, sha1
, 1, &flag
) &&
1397 delete_ref(newrefname
, sha1
, REF_NODEREF
)) {
1398 if (errno
==EISDIR
) {
1399 if (remove_empty_directories(git_path("%s", newrefname
))) {
1400 error("Directory not empty: %s", newrefname
);
1404 error("unable to delete existing %s", newrefname
);
1409 if (log
&& safe_create_leading_directories(git_path("logs/%s", newrefname
))) {
1410 error("unable to create directory for %s", newrefname
);
1415 if (log
&& rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", newrefname
))) {
1416 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1418 * rename(a, b) when b is an existing
1419 * directory ought to result in ISDIR, but
1420 * Solaris 5.8 gives ENOTDIR. Sheesh.
1422 if (remove_empty_directories(git_path("logs/%s", newrefname
))) {
1423 error("Directory not empty: logs/%s", newrefname
);
1428 error("unable to move logfile "TMP_RENAMED_LOG
" to logs/%s: %s",
1429 newrefname
, strerror(errno
));
1435 lock
= lock_ref_sha1_basic(newrefname
, NULL
, 0, NULL
);
1437 error("unable to lock %s for update", newrefname
);
1440 lock
->force_write
= 1;
1441 hashcpy(lock
->old_sha1
, orig_sha1
);
1442 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1443 error("unable to write current sha1 into %s", newrefname
);
1450 lock
= lock_ref_sha1_basic(oldrefname
, NULL
, 0, NULL
);
1452 error("unable to lock %s for rollback", oldrefname
);
1456 lock
->force_write
= 1;
1457 flag
= log_all_ref_updates
;
1458 log_all_ref_updates
= 0;
1459 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1460 error("unable to write current sha1 into %s", oldrefname
);
1461 log_all_ref_updates
= flag
;
1464 if (logmoved
&& rename(git_path("logs/%s", newrefname
), git_path("logs/%s", oldrefname
)))
1465 error("unable to restore logfile %s from %s: %s",
1466 oldrefname
, newrefname
, strerror(errno
));
1467 if (!logmoved
&& log
&&
1468 rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", oldrefname
)))
1469 error("unable to restore logfile %s from "TMP_RENAMED_LOG
": %s",
1470 oldrefname
, strerror(errno
));
1475 int close_ref(struct ref_lock
*lock
)
1477 if (close_lock_file(lock
->lk
))
1483 int commit_ref(struct ref_lock
*lock
)
1485 if (commit_lock_file(lock
->lk
))
1491 void unlock_ref(struct ref_lock
*lock
)
1493 /* Do not free lock->lk -- atexit() still looks at them */
1495 rollback_lock_file(lock
->lk
);
1496 free(lock
->ref_name
);
1497 free(lock
->orig_ref_name
);
1502 * copy the reflog message msg to buf, which has been allocated sufficiently
1503 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1504 * because reflog file is one line per entry.
1506 static int copy_msg(char *buf
, const char *msg
)
1513 while ((c
= *msg
++)) {
1514 if (wasspace
&& isspace(c
))
1516 wasspace
= isspace(c
);
1521 while (buf
< cp
&& isspace(cp
[-1]))
1527 int log_ref_setup(const char *refname
, char *logfile
, int bufsize
)
1529 int logfd
, oflags
= O_APPEND
| O_WRONLY
;
1531 git_snpath(logfile
, bufsize
, "logs/%s", refname
);
1532 if (log_all_ref_updates
&&
1533 (!prefixcmp(refname
, "refs/heads/") ||
1534 !prefixcmp(refname
, "refs/remotes/") ||
1535 !prefixcmp(refname
, "refs/notes/") ||
1536 !strcmp(refname
, "HEAD"))) {
1537 if (safe_create_leading_directories(logfile
) < 0)
1538 return error("unable to create directory for %s",
1543 logfd
= open(logfile
, oflags
, 0666);
1545 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1548 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1549 if (remove_empty_directories(logfile
)) {
1550 return error("There are still logs under '%s'",
1553 logfd
= open(logfile
, oflags
, 0666);
1557 return error("Unable to append to %s: %s",
1558 logfile
, strerror(errno
));
1561 adjust_shared_perm(logfile
);
1566 static int log_ref_write(const char *refname
, const unsigned char *old_sha1
,
1567 const unsigned char *new_sha1
, const char *msg
)
1569 int logfd
, result
, written
, oflags
= O_APPEND
| O_WRONLY
;
1570 unsigned maxlen
, len
;
1572 char log_file
[PATH_MAX
];
1574 const char *committer
;
1576 if (log_all_ref_updates
< 0)
1577 log_all_ref_updates
= !is_bare_repository();
1579 result
= log_ref_setup(refname
, log_file
, sizeof(log_file
));
1583 logfd
= open(log_file
, oflags
);
1586 msglen
= msg
? strlen(msg
) : 0;
1587 committer
= git_committer_info(0);
1588 maxlen
= strlen(committer
) + msglen
+ 100;
1589 logrec
= xmalloc(maxlen
);
1590 len
= sprintf(logrec
, "%s %s %s\n",
1591 sha1_to_hex(old_sha1
),
1592 sha1_to_hex(new_sha1
),
1595 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1596 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1598 if (close(logfd
) != 0 || written
!= len
)
1599 return error("Unable to append to %s", log_file
);
1603 static int is_branch(const char *refname
)
1605 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1608 int write_ref_sha1(struct ref_lock
*lock
,
1609 const unsigned char *sha1
, const char *logmsg
)
1611 static char term
= '\n';
1616 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1620 o
= parse_object(sha1
);
1622 error("Trying to write ref %s with nonexistent object %s",
1623 lock
->ref_name
, sha1_to_hex(sha1
));
1627 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1628 error("Trying to write non-commit object %s to branch %s",
1629 sha1_to_hex(sha1
), lock
->ref_name
);
1633 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1634 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1635 || close_ref(lock
) < 0) {
1636 error("Couldn't write %s", lock
->lk
->filename
);
1640 clear_loose_ref_cache(get_ref_cache(NULL
));
1641 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1642 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1643 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1647 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1649 * Special hack: If a branch is updated directly and HEAD
1650 * points to it (may happen on the remote side of a push
1651 * for example) then logically the HEAD reflog should be
1653 * A generic solution implies reverse symref information,
1654 * but finding all symrefs pointing to the given branch
1655 * would be rather costly for this rare event (the direct
1656 * update of a branch) to be worth it. So let's cheat and
1657 * check with HEAD only which should cover 99% of all usage
1658 * scenarios (even 100% of the default ones).
1660 unsigned char head_sha1
[20];
1662 const char *head_ref
;
1663 head_ref
= resolve_ref("HEAD", head_sha1
, 1, &head_flag
);
1664 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1665 !strcmp(head_ref
, lock
->ref_name
))
1666 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1668 if (commit_ref(lock
)) {
1669 error("Couldn't set %s", lock
->ref_name
);
1677 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1680 const char *lockpath
;
1682 int fd
, len
, written
;
1683 char *git_HEAD
= git_pathdup("%s", ref_target
);
1684 unsigned char old_sha1
[20], new_sha1
[20];
1686 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1689 if (safe_create_leading_directories(git_HEAD
) < 0)
1690 return error("unable to create directory for %s", git_HEAD
);
1692 #ifndef NO_SYMLINK_HEAD
1693 if (prefer_symlink_refs
) {
1695 if (!symlink(refs_heads_master
, git_HEAD
))
1697 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1701 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1702 if (sizeof(ref
) <= len
) {
1703 error("refname too long: %s", refs_heads_master
);
1704 goto error_free_return
;
1706 lockpath
= mkpath("%s.lock", git_HEAD
);
1707 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1709 error("Unable to open %s for writing", lockpath
);
1710 goto error_free_return
;
1712 written
= write_in_full(fd
, ref
, len
);
1713 if (close(fd
) != 0 || written
!= len
) {
1714 error("Unable to write to %s", lockpath
);
1715 goto error_unlink_return
;
1717 if (rename(lockpath
, git_HEAD
) < 0) {
1718 error("Unable to create %s", git_HEAD
);
1719 goto error_unlink_return
;
1721 if (adjust_shared_perm(git_HEAD
)) {
1722 error("Unable to fix permissions on %s", lockpath
);
1723 error_unlink_return
:
1724 unlink_or_warn(lockpath
);
1730 #ifndef NO_SYMLINK_HEAD
1733 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1734 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1740 static char *ref_msg(const char *line
, const char *endp
)
1744 ep
= memchr(line
, '\n', endp
- line
);
1747 return xmemdupz(line
, ep
- line
);
1750 int read_ref_at(const char *refname
, unsigned long at_time
, int cnt
,
1751 unsigned char *sha1
, char **msg
,
1752 unsigned long *cutoff_time
, int *cutoff_tz
, int *cutoff_cnt
)
1754 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1756 int logfd
, tz
, reccnt
= 0;
1759 unsigned char logged_sha1
[20];
1763 logfile
= git_path("logs/%s", refname
);
1764 logfd
= open(logfile
, O_RDONLY
, 0);
1766 die_errno("Unable to read log '%s'", logfile
);
1769 die("Log %s is empty.", logfile
);
1770 mapsz
= xsize_t(st
.st_size
);
1771 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1772 logdata
= log_mapped
;
1776 rec
= logend
= logdata
+ st
.st_size
;
1777 while (logdata
< rec
) {
1779 if (logdata
< rec
&& *(rec
-1) == '\n')
1782 while (logdata
< rec
&& *(rec
-1) != '\n') {
1788 die("Log %s is corrupt.", logfile
);
1789 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1790 if (date
<= at_time
|| cnt
== 0) {
1791 tz
= strtoul(tz_c
, NULL
, 10);
1793 *msg
= ref_msg(rec
, logend
);
1795 *cutoff_time
= date
;
1799 *cutoff_cnt
= reccnt
- 1;
1801 if (get_sha1_hex(lastrec
, logged_sha1
))
1802 die("Log %s is corrupt.", logfile
);
1803 if (get_sha1_hex(rec
+ 41, sha1
))
1804 die("Log %s is corrupt.", logfile
);
1805 if (hashcmp(logged_sha1
, sha1
)) {
1806 warning("Log %s has gap after %s.",
1807 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1810 else if (date
== at_time
) {
1811 if (get_sha1_hex(rec
+ 41, sha1
))
1812 die("Log %s is corrupt.", logfile
);
1815 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1816 die("Log %s is corrupt.", logfile
);
1817 if (hashcmp(logged_sha1
, sha1
)) {
1818 warning("Log %s unexpectedly ended on %s.",
1819 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1822 munmap(log_mapped
, mapsz
);
1831 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1833 if (rec
== logend
|| *rec
== '\n')
1834 die("Log %s is corrupt.", logfile
);
1835 date
= strtoul(rec
+ 1, &tz_c
, 10);
1836 tz
= strtoul(tz_c
, NULL
, 10);
1837 if (get_sha1_hex(logdata
, sha1
))
1838 die("Log %s is corrupt.", logfile
);
1839 if (is_null_sha1(sha1
)) {
1840 if (get_sha1_hex(logdata
+ 41, sha1
))
1841 die("Log %s is corrupt.", logfile
);
1844 *msg
= ref_msg(logdata
, logend
);
1845 munmap(log_mapped
, mapsz
);
1848 *cutoff_time
= date
;
1852 *cutoff_cnt
= reccnt
;
1856 int for_each_recent_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1858 const char *logfile
;
1860 struct strbuf sb
= STRBUF_INIT
;
1863 logfile
= git_path("logs/%s", refname
);
1864 logfp
= fopen(logfile
, "r");
1869 struct stat statbuf
;
1870 if (fstat(fileno(logfp
), &statbuf
) ||
1871 statbuf
.st_size
< ofs
||
1872 fseek(logfp
, -ofs
, SEEK_END
) ||
1873 strbuf_getwholeline(&sb
, logfp
, '\n')) {
1875 strbuf_release(&sb
);
1880 while (!strbuf_getwholeline(&sb
, logfp
, '\n')) {
1881 unsigned char osha1
[20], nsha1
[20];
1882 char *email_end
, *message
;
1883 unsigned long timestamp
;
1886 /* old SP new SP name <email> SP time TAB msg LF */
1887 if (sb
.len
< 83 || sb
.buf
[sb
.len
- 1] != '\n' ||
1888 get_sha1_hex(sb
.buf
, osha1
) || sb
.buf
[40] != ' ' ||
1889 get_sha1_hex(sb
.buf
+ 41, nsha1
) || sb
.buf
[81] != ' ' ||
1890 !(email_end
= strchr(sb
.buf
+ 82, '>')) ||
1891 email_end
[1] != ' ' ||
1892 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1893 !message
|| message
[0] != ' ' ||
1894 (message
[1] != '+' && message
[1] != '-') ||
1895 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1896 !isdigit(message
[4]) || !isdigit(message
[5]))
1897 continue; /* corrupt? */
1898 email_end
[1] = '\0';
1899 tz
= strtol(message
+ 1, NULL
, 10);
1900 if (message
[6] != '\t')
1904 ret
= fn(osha1
, nsha1
, sb
.buf
+ 82, timestamp
, tz
, message
,
1910 strbuf_release(&sb
);
1914 int for_each_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, void *cb_data
)
1916 return for_each_recent_reflog_ent(refname
, fn
, 0, cb_data
);
1919 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
1921 DIR *dir
= opendir(git_path("logs/%s", base
));
1926 int baselen
= strlen(base
);
1927 char *log
= xmalloc(baselen
+ 257);
1929 memcpy(log
, base
, baselen
);
1930 if (baselen
&& base
[baselen
-1] != '/')
1931 log
[baselen
++] = '/';
1933 while ((de
= readdir(dir
)) != NULL
) {
1937 if (de
->d_name
[0] == '.')
1939 namelen
= strlen(de
->d_name
);
1942 if (has_extension(de
->d_name
, ".lock"))
1944 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
1945 if (stat(git_path("logs/%s", log
), &st
) < 0)
1947 if (S_ISDIR(st
.st_mode
)) {
1948 retval
= do_for_each_reflog(log
, fn
, cb_data
);
1950 unsigned char sha1
[20];
1951 if (read_ref_full(log
, sha1
, 0, NULL
))
1952 retval
= error("bad ref for %s", log
);
1954 retval
= fn(log
, sha1
, 0, cb_data
);
1967 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
1969 return do_for_each_reflog("", fn
, cb_data
);
1972 int update_ref(const char *action
, const char *refname
,
1973 const unsigned char *sha1
, const unsigned char *oldval
,
1974 int flags
, enum action_on_err onerr
)
1976 static struct ref_lock
*lock
;
1977 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
1979 const char *str
= "Cannot lock the ref '%s'.";
1981 case MSG_ON_ERR
: error(str
, refname
); break;
1982 case DIE_ON_ERR
: die(str
, refname
); break;
1983 case QUIET_ON_ERR
: break;
1987 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
1988 const char *str
= "Cannot update the ref '%s'.";
1990 case MSG_ON_ERR
: error(str
, refname
); break;
1991 case DIE_ON_ERR
: die(str
, refname
); break;
1992 case QUIET_ON_ERR
: break;
1999 int ref_exists(const char *refname
)
2001 unsigned char sha1
[20];
2002 return !!resolve_ref(refname
, sha1
, 1, NULL
);
2005 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
2007 for ( ; list
; list
= list
->next
)
2008 if (!strcmp(list
->name
, name
))
2009 return (struct ref
*)list
;
2014 * generate a format suitable for scanf from a ref_rev_parse_rules
2015 * rule, that is replace the "%.*s" spec with a "%s" spec
2017 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
2021 spec
= strstr(rule
, "%.*s");
2022 if (!spec
|| strstr(spec
+ 4, "%.*s"))
2023 die("invalid rule in ref_rev_parse_rules: %s", rule
);
2025 /* copy all until spec */
2026 strncpy(scanf_fmt
, rule
, spec
- rule
);
2027 scanf_fmt
[spec
- rule
] = '\0';
2029 strcat(scanf_fmt
, "%s");
2030 /* copy remaining rule */
2031 strcat(scanf_fmt
, spec
+ 4);
2036 char *shorten_unambiguous_ref(const char *refname
, int strict
)
2039 static char **scanf_fmts
;
2040 static int nr_rules
;
2043 /* pre generate scanf formats from ref_rev_parse_rules[] */
2045 size_t total_len
= 0;
2047 /* the rule list is NULL terminated, count them first */
2048 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
2049 /* no +1 because strlen("%s") < strlen("%.*s") */
2050 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
2052 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
2055 for (i
= 0; i
< nr_rules
; i
++) {
2056 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
2058 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
2059 total_len
+= strlen(ref_rev_parse_rules
[i
]);
2063 /* bail out if there are no rules */
2065 return xstrdup(refname
);
2067 /* buffer for scanf result, at most refname must fit */
2068 short_name
= xstrdup(refname
);
2070 /* skip first rule, it will always match */
2071 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
2073 int rules_to_fail
= i
;
2076 if (1 != sscanf(refname
, scanf_fmts
[i
], short_name
))
2079 short_name_len
= strlen(short_name
);
2082 * in strict mode, all (except the matched one) rules
2083 * must fail to resolve to a valid non-ambiguous ref
2086 rules_to_fail
= nr_rules
;
2089 * check if the short name resolves to a valid ref,
2090 * but use only rules prior to the matched one
2092 for (j
= 0; j
< rules_to_fail
; j
++) {
2093 const char *rule
= ref_rev_parse_rules
[j
];
2094 char refname
[PATH_MAX
];
2096 /* skip matched rule */
2101 * the short name is ambiguous, if it resolves
2102 * (with this previous rule) to a valid ref
2103 * read_ref() returns 0 on success
2105 mksnpath(refname
, sizeof(refname
),
2106 rule
, short_name_len
, short_name
);
2107 if (ref_exists(refname
))
2112 * short name is non-ambiguous if all previous rules
2113 * haven't resolved to a valid ref
2115 if (j
== rules_to_fail
)
2120 return xstrdup(refname
);