8 * Make sure "ref" is something reasonable to have under ".git/refs/";
9 * We do not like it if:
11 * - any path component of it begins with ".", or
12 * - it has double dots "..", or
13 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
14 * - it ends with a "/".
15 * - it ends with ".lock"
16 * - it contains a "\" (backslash)
19 /* Return true iff ch is not allowed in reference names. */
20 static inline int bad_ref_char(int ch
)
22 if (((unsigned) ch
) <= ' ' || ch
== 0x7f ||
23 ch
== '~' || ch
== '^' || ch
== ':' || ch
== '\\')
25 /* 2.13 Pattern Matching Notation */
26 if (ch
== '*' || ch
== '?' || ch
== '[') /* Unsupported */
32 * Try to read one refname component from the front of refname. Return
33 * the length of the component found, or -1 if the component is not
36 static int check_refname_component(const char *refname
, int flags
)
41 for (cp
= refname
; ; cp
++) {
43 if (ch
== '\0' || ch
== '/')
46 return -1; /* Illegal character in refname. */
47 if (last
== '.' && ch
== '.')
48 return -1; /* Refname contains "..". */
49 if (last
== '@' && ch
== '{')
50 return -1; /* Refname contains "@{". */
54 return 0; /* Component has zero length. */
55 if (refname
[0] == '.') {
56 if (!(flags
& REFNAME_DOT_COMPONENT
))
57 return -1; /* Component starts with '.'. */
59 * Even if leading dots are allowed, don't allow "."
60 * as a component (".." is prevented by a rule above).
62 if (refname
[1] == '\0')
63 return -1; /* Component equals ".". */
65 if (cp
- refname
>= 5 && !memcmp(cp
- 5, ".lock", 5))
66 return -1; /* Refname ends with ".lock". */
70 int check_refname_format(const char *refname
, int flags
)
72 int component_len
, component_count
= 0;
75 /* We are at the start of a path component. */
76 component_len
= check_refname_component(refname
, flags
);
77 if (component_len
<= 0) {
78 if ((flags
& REFNAME_REFSPEC_PATTERN
) &&
80 (refname
[1] == '\0' || refname
[1] == '/')) {
81 /* Accept one wildcard as a full refname component. */
82 flags
&= ~REFNAME_REFSPEC_PATTERN
;
89 if (refname
[component_len
] == '\0')
91 /* Skip to next component. */
92 refname
+= component_len
+ 1;
95 if (refname
[component_len
- 1] == '.')
96 return -1; /* Refname ends with '.'. */
97 if (!(flags
& REFNAME_ALLOW_ONELEVEL
) && component_count
< 2)
98 return -1; /* Refname has only one component. */
105 unsigned char sha1
[20];
106 unsigned char peeled
[20];
113 * Entries with index 0 <= i < sorted are sorted by name. New
114 * entries are appended to the list unsorted, and are sorted
115 * only when required; thus we avoid the need to sort the list
116 * after the addition of every reference.
120 struct ref_entry
**entries
;
123 /* ISSYMREF=0x01, ISPACKED=0x02 and ISBROKEN=0x04 are public interfaces */
124 #define REF_KNOWS_PEELED 0x10
127 unsigned char flag
; /* ISSYMREF? ISPACKED? */
129 struct ref_value value
;
131 /* The full name of the reference (e.g., "refs/heads/master"): */
132 char name
[FLEX_ARRAY
];
135 static struct ref_entry
*create_ref_entry(const char *refname
,
136 const unsigned char *sha1
, int flag
,
140 struct ref_entry
*ref
;
143 check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
|REFNAME_DOT_COMPONENT
))
144 die("Reference has invalid format: '%s'", refname
);
145 len
= strlen(refname
) + 1;
146 ref
= xmalloc(sizeof(struct ref_entry
) + len
);
147 hashcpy(ref
->u
.value
.sha1
, sha1
);
148 hashclr(ref
->u
.value
.peeled
);
149 memcpy(ref
->name
, refname
, len
);
154 static void free_ref_entry(struct ref_entry
*entry
)
159 /* Add a ref_entry to the end of the ref_dir (unsorted). */
160 static void add_ref(struct ref_dir
*refs
, struct ref_entry
*ref
)
162 ALLOC_GROW(refs
->entries
, refs
->nr
+ 1, refs
->alloc
);
163 refs
->entries
[refs
->nr
++] = ref
;
166 static void clear_ref_dir(struct ref_dir
*dir
)
169 for (i
= 0; i
< dir
->nr
; i
++)
170 free_ref_entry(dir
->entries
[i
]);
172 dir
->sorted
= dir
->nr
= dir
->alloc
= 0;
176 static int ref_entry_cmp(const void *a
, const void *b
)
178 struct ref_entry
*one
= *(struct ref_entry
**)a
;
179 struct ref_entry
*two
= *(struct ref_entry
**)b
;
180 return strcmp(one
->name
, two
->name
);
183 static void sort_ref_dir(struct ref_dir
*dir
);
185 static struct ref_entry
*search_ref_dir(struct ref_dir
*dir
, const char *refname
)
187 struct ref_entry
*e
, **r
;
196 len
= strlen(refname
) + 1;
197 e
= xmalloc(sizeof(struct ref_entry
) + len
);
198 memcpy(e
->name
, refname
, len
);
200 r
= bsearch(&e
, dir
->entries
, dir
->nr
, sizeof(*dir
->entries
), ref_entry_cmp
);
211 * Emit a warning and return true iff ref1 and ref2 have the same name
212 * and the same sha1. Die if they have the same name but different
215 static int is_dup_ref(const struct ref_entry
*ref1
, const struct ref_entry
*ref2
)
217 if (!strcmp(ref1
->name
, ref2
->name
)) {
218 /* Duplicate name; make sure that the SHA1s match: */
219 if (hashcmp(ref1
->u
.value
.sha1
, ref2
->u
.value
.sha1
))
220 die("Duplicated ref, and SHA1s don't match: %s",
222 warning("Duplicated ref: %s", ref1
->name
);
230 * Sort the entries in dir (if they are not already sorted).
232 static void sort_ref_dir(struct ref_dir
*dir
)
237 * This check also prevents passing a zero-length array to qsort(),
238 * which is a problem on some platforms.
240 if (dir
->sorted
== dir
->nr
)
243 qsort(dir
->entries
, dir
->nr
, sizeof(*dir
->entries
), ref_entry_cmp
);
245 /* Remove any duplicates from the ref_dir */
247 for (j
= 1; j
< dir
->nr
; j
++) {
248 if (is_dup_ref(dir
->entries
[i
], dir
->entries
[j
])) {
249 free_ref_entry(dir
->entries
[j
]);
252 dir
->entries
[++i
] = dir
->entries
[j
];
254 dir
->sorted
= dir
->nr
= i
+ 1;
257 #define DO_FOR_EACH_INCLUDE_BROKEN 01
259 static struct ref_entry
*current_ref
;
261 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
262 int flags
, void *cb_data
, struct ref_entry
*entry
)
265 if (prefixcmp(entry
->name
, base
))
268 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
269 if (entry
->flag
& REF_ISBROKEN
)
270 return 0; /* ignore broken refs e.g. dangling symref */
271 if (!has_sha1_file(entry
->u
.value
.sha1
)) {
272 error("%s does not point to a valid object!", entry
->name
);
277 retval
= fn(entry
->name
+ trim
, entry
->u
.value
.sha1
, entry
->flag
, cb_data
);
283 * Call fn for each reference in dir that has index in the range
284 * offset <= index < dir->nr. This function does not sort the dir;
285 * sorting should be done by the caller.
287 static int do_for_each_ref_in_dir(struct ref_dir
*dir
, int offset
,
289 each_ref_fn fn
, int trim
, int flags
, void *cb_data
)
292 assert(dir
->sorted
== dir
->nr
);
293 for (i
= offset
; i
< dir
->nr
; i
++) {
294 int retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, dir
->entries
[i
]);
302 * Call fn for each reference in the union of dir1 and dir2, in order
303 * by refname. If an entry appears in both dir1 and dir2, then only
304 * process the version that is in dir2. The input dirs must already
307 static int do_for_each_ref_in_dirs(struct ref_dir
*dir1
,
308 struct ref_dir
*dir2
,
309 const char *base
, each_ref_fn fn
, int trim
,
310 int flags
, void *cb_data
)
315 assert(dir1
->sorted
== dir1
->nr
);
316 assert(dir2
->sorted
== dir2
->nr
);
317 while (i1
< dir1
->nr
&& i2
< dir2
->nr
) {
318 struct ref_entry
*e1
= dir1
->entries
[i1
];
319 struct ref_entry
*e2
= dir2
->entries
[i2
];
320 int cmp
= strcmp(e1
->name
, e2
->name
);
322 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, e1
);
325 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, e2
);
329 * There was a ref in array1 with the
330 * same name; ignore it.
339 return do_for_each_ref_in_dir(dir1
, i1
,
340 base
, fn
, trim
, flags
, cb_data
);
342 return do_for_each_ref_in_dir(dir2
, i2
,
343 base
, fn
, trim
, flags
, cb_data
);
348 * Return true iff refname1 and refname2 conflict with each other.
349 * Two reference names conflict if one of them exactly matches the
350 * leading components of the other; e.g., "foo/bar" conflicts with
351 * both "foo" and with "foo/bar/baz" but not with "foo/bar" or
354 static int names_conflict(const char *refname1
, const char *refname2
)
356 for (; *refname1
&& *refname1
== *refname2
; refname1
++, refname2
++)
358 return (*refname1
== '\0' && *refname2
== '/')
359 || (*refname1
== '/' && *refname2
== '\0');
362 struct name_conflict_cb
{
364 const char *oldrefname
;
365 const char *conflicting_refname
;
368 static int name_conflict_fn(const char *existingrefname
, const unsigned char *sha1
,
369 int flags
, void *cb_data
)
371 struct name_conflict_cb
*data
= (struct name_conflict_cb
*)cb_data
;
372 if (data
->oldrefname
&& !strcmp(data
->oldrefname
, existingrefname
))
374 if (names_conflict(data
->refname
, existingrefname
)) {
375 data
->conflicting_refname
= existingrefname
;
382 * Return true iff a reference named refname could be created without
383 * conflicting with the name of an existing reference in array. If
384 * oldrefname is non-NULL, ignore potential conflicts with oldrefname
385 * (e.g., because oldrefname is scheduled for deletion in the same
388 static int is_refname_available(const char *refname
, const char *oldrefname
,
391 struct name_conflict_cb data
;
392 data
.refname
= refname
;
393 data
.oldrefname
= oldrefname
;
394 data
.conflicting_refname
= NULL
;
397 if (do_for_each_ref_in_dir(dir
, 0, "", name_conflict_fn
,
398 0, DO_FOR_EACH_INCLUDE_BROKEN
,
400 error("'%s' exists; cannot create '%s'",
401 data
.conflicting_refname
, refname
);
408 * Future: need to be in "struct repository"
409 * when doing a full libification.
411 static struct ref_cache
{
412 struct ref_cache
*next
;
415 struct ref_dir loose
;
416 struct ref_dir packed
;
417 /* The submodule name, or "" for the main repo. */
418 char name
[FLEX_ARRAY
];
421 static void clear_packed_ref_cache(struct ref_cache
*refs
)
423 if (refs
->did_packed
)
424 clear_ref_dir(&refs
->packed
);
425 refs
->did_packed
= 0;
428 static void clear_loose_ref_cache(struct ref_cache
*refs
)
431 clear_ref_dir(&refs
->loose
);
435 static struct ref_cache
*create_ref_cache(const char *submodule
)
438 struct ref_cache
*refs
;
441 len
= strlen(submodule
) + 1;
442 refs
= xcalloc(1, sizeof(struct ref_cache
) + len
);
443 memcpy(refs
->name
, submodule
, len
);
448 * Return a pointer to a ref_cache for the specified submodule. For
449 * the main repository, use submodule==NULL. The returned structure
450 * will be allocated and initialized but not necessarily populated; it
451 * should not be freed.
453 static struct ref_cache
*get_ref_cache(const char *submodule
)
455 struct ref_cache
*refs
= ref_cache
;
459 if (!strcmp(submodule
, refs
->name
))
464 refs
= create_ref_cache(submodule
);
465 refs
->next
= ref_cache
;
470 void invalidate_ref_cache(const char *submodule
)
472 struct ref_cache
*refs
= get_ref_cache(submodule
);
473 clear_packed_ref_cache(refs
);
474 clear_loose_ref_cache(refs
);
478 * Parse one line from a packed-refs file. Write the SHA1 to sha1.
479 * Return a pointer to the refname within the line (null-terminated),
480 * or NULL if there was a problem.
482 static const char *parse_ref_line(char *line
, unsigned char *sha1
)
485 * 42: the answer to everything.
487 * In this case, it happens to be the answer to
488 * 40 (length of sha1 hex representation)
489 * +1 (space in between hex and name)
490 * +1 (newline at the end of the line)
492 int len
= strlen(line
) - 42;
496 if (get_sha1_hex(line
, sha1
) < 0)
498 if (!isspace(line
[40]))
503 if (line
[len
] != '\n')
510 static void read_packed_refs(FILE *f
, struct ref_dir
*dir
)
512 struct ref_entry
*last
= NULL
;
513 char refline
[PATH_MAX
];
514 int flag
= REF_ISPACKED
;
516 while (fgets(refline
, sizeof(refline
), f
)) {
517 unsigned char sha1
[20];
519 static const char header
[] = "# pack-refs with:";
521 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
522 const char *traits
= refline
+ sizeof(header
) - 1;
523 if (strstr(traits
, " peeled "))
524 flag
|= REF_KNOWS_PEELED
;
525 /* perhaps other traits later as well */
529 refname
= parse_ref_line(refline
, sha1
);
531 last
= create_ref_entry(refname
, sha1
, flag
, 1);
537 strlen(refline
) == 42 &&
538 refline
[41] == '\n' &&
539 !get_sha1_hex(refline
+ 1, sha1
))
540 hashcpy(last
->u
.value
.peeled
, sha1
);
544 static struct ref_dir
*get_packed_refs(struct ref_cache
*refs
)
546 if (!refs
->did_packed
) {
547 const char *packed_refs_file
;
551 packed_refs_file
= git_path_submodule(refs
->name
, "packed-refs");
553 packed_refs_file
= git_path("packed-refs");
554 f
= fopen(packed_refs_file
, "r");
556 read_packed_refs(f
, &refs
->packed
);
559 refs
->did_packed
= 1;
561 return &refs
->packed
;
564 void add_packed_ref(const char *refname
, const unsigned char *sha1
)
566 add_ref(get_packed_refs(get_ref_cache(NULL
)),
567 create_ref_entry(refname
, sha1
, REF_ISPACKED
, 1));
570 static void get_ref_dir(struct ref_cache
*refs
, const char *base
,
577 path
= git_path_submodule(refs
->name
, "%s", base
);
579 path
= git_path("%s", base
);
584 int baselen
= strlen(base
);
585 char *refname
= xmalloc(baselen
+ 257);
587 memcpy(refname
, base
, baselen
);
588 if (baselen
&& base
[baselen
-1] != '/')
589 refname
[baselen
++] = '/';
591 while ((de
= readdir(d
)) != NULL
) {
592 unsigned char sha1
[20];
598 if (de
->d_name
[0] == '.')
600 namelen
= strlen(de
->d_name
);
603 if (has_extension(de
->d_name
, ".lock"))
605 memcpy(refname
+ baselen
, de
->d_name
, namelen
+1);
607 ? git_path_submodule(refs
->name
, "%s", refname
)
608 : git_path("%s", refname
);
609 if (stat(refdir
, &st
) < 0)
611 if (S_ISDIR(st
.st_mode
)) {
612 get_ref_dir(refs
, refname
, dir
);
618 if (resolve_gitlink_ref(refs
->name
, refname
, sha1
) < 0) {
620 flag
|= REF_ISBROKEN
;
622 } else if (read_ref_full(refname
, sha1
, 1, &flag
)) {
624 flag
|= REF_ISBROKEN
;
626 add_ref(dir
, create_ref_entry(refname
, sha1
, flag
, 1));
633 static struct ref_dir
*get_loose_refs(struct ref_cache
*refs
)
635 if (!refs
->did_loose
) {
636 get_ref_dir(refs
, "refs", &refs
->loose
);
642 /* We allow "recursive" symbolic refs. Only within reason, though */
644 #define MAXREFLEN (1024)
647 * Called by resolve_gitlink_ref_recursive() after it failed to read
648 * from the loose refs in ref_cache refs. Find <refname> in the
649 * packed-refs file for the submodule.
651 static int resolve_gitlink_packed_ref(struct ref_cache
*refs
,
652 const char *refname
, unsigned char *sha1
)
654 struct ref_entry
*ref
;
655 struct ref_dir
*dir
= get_packed_refs(refs
);
657 ref
= search_ref_dir(dir
, refname
);
661 memcpy(sha1
, ref
->u
.value
.sha1
, 20);
665 static int resolve_gitlink_ref_recursive(struct ref_cache
*refs
,
666 const char *refname
, unsigned char *sha1
,
670 char buffer
[128], *p
;
673 if (recursion
> MAXDEPTH
|| strlen(refname
) > MAXREFLEN
)
676 ? git_path_submodule(refs
->name
, "%s", refname
)
677 : git_path("%s", refname
);
678 fd
= open(path
, O_RDONLY
);
680 return resolve_gitlink_packed_ref(refs
, refname
, sha1
);
682 len
= read(fd
, buffer
, sizeof(buffer
)-1);
686 while (len
&& isspace(buffer
[len
-1]))
690 /* Was it a detached head or an old-fashioned symlink? */
691 if (!get_sha1_hex(buffer
, sha1
))
695 if (strncmp(buffer
, "ref:", 4))
701 return resolve_gitlink_ref_recursive(refs
, p
, sha1
, recursion
+1);
704 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *sha1
)
706 int len
= strlen(path
), retval
;
708 struct ref_cache
*refs
;
710 while (len
&& path
[len
-1] == '/')
714 submodule
= xstrndup(path
, len
);
715 refs
= get_ref_cache(submodule
);
718 retval
= resolve_gitlink_ref_recursive(refs
, refname
, sha1
, 0);
723 * Try to read ref from the packed references. On success, set sha1
724 * and return 0; otherwise, return -1.
726 static int get_packed_ref(const char *refname
, unsigned char *sha1
)
728 struct ref_dir
*packed
= get_packed_refs(get_ref_cache(NULL
));
729 struct ref_entry
*entry
= search_ref_dir(packed
, refname
);
731 hashcpy(sha1
, entry
->u
.value
.sha1
);
737 const char *resolve_ref_unsafe(const char *refname
, unsigned char *sha1
, int reading
, int *flag
)
739 int depth
= MAXDEPTH
;
742 static char refname_buffer
[256];
747 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
759 git_snpath(path
, sizeof(path
), "%s", refname
);
761 if (lstat(path
, &st
) < 0) {
765 * The loose reference file does not exist;
766 * check for a packed reference.
768 if (!get_packed_ref(refname
, sha1
)) {
770 *flag
|= REF_ISPACKED
;
773 /* The reference is not a packed reference, either. */
782 /* Follow "normalized" - ie "refs/.." symlinks by hand */
783 if (S_ISLNK(st
.st_mode
)) {
784 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
788 if (!prefixcmp(buffer
, "refs/") &&
789 !check_refname_format(buffer
, 0)) {
790 strcpy(refname_buffer
, buffer
);
791 refname
= refname_buffer
;
793 *flag
|= REF_ISSYMREF
;
798 /* Is it a directory? */
799 if (S_ISDIR(st
.st_mode
)) {
805 * Anything else, just open it and try to use it as
808 fd
= open(path
, O_RDONLY
);
811 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
815 while (len
&& isspace(buffer
[len
-1]))
820 * Is it a symbolic ref?
822 if (prefixcmp(buffer
, "ref:"))
825 *flag
|= REF_ISSYMREF
;
827 while (isspace(*buf
))
829 if (check_refname_format(buf
, REFNAME_ALLOW_ONELEVEL
)) {
831 *flag
|= REF_ISBROKEN
;
834 refname
= strcpy(refname_buffer
, buf
);
836 /* Please note that FETCH_HEAD has a second line containing other data. */
837 if (get_sha1_hex(buffer
, sha1
) || (buffer
[40] != '\0' && !isspace(buffer
[40]))) {
839 *flag
|= REF_ISBROKEN
;
845 char *resolve_refdup(const char *ref
, unsigned char *sha1
, int reading
, int *flag
)
847 const char *ret
= resolve_ref_unsafe(ref
, sha1
, reading
, flag
);
848 return ret
? xstrdup(ret
) : NULL
;
851 /* The argument to filter_refs */
858 int read_ref_full(const char *refname
, unsigned char *sha1
, int reading
, int *flags
)
860 if (resolve_ref_unsafe(refname
, sha1
, reading
, flags
))
865 int read_ref(const char *refname
, unsigned char *sha1
)
867 return read_ref_full(refname
, sha1
, 1, NULL
);
870 int ref_exists(const char *refname
)
872 unsigned char sha1
[20];
873 return !!resolve_ref_unsafe(refname
, sha1
, 1, NULL
);
876 static int filter_refs(const char *refname
, const unsigned char *sha1
, int flags
,
879 struct ref_filter
*filter
= (struct ref_filter
*)data
;
880 if (fnmatch(filter
->pattern
, refname
, 0))
882 return filter
->fn(refname
, sha1
, flags
, filter
->cb_data
);
885 int peel_ref(const char *refname
, unsigned char *sha1
)
888 unsigned char base
[20];
891 if (current_ref
&& (current_ref
->name
== refname
892 || !strcmp(current_ref
->name
, refname
))) {
893 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
894 hashcpy(sha1
, current_ref
->u
.value
.peeled
);
897 hashcpy(base
, current_ref
->u
.value
.sha1
);
901 if (read_ref_full(refname
, base
, 1, &flag
))
904 if ((flag
& REF_ISPACKED
)) {
905 struct ref_dir
*dir
= get_packed_refs(get_ref_cache(NULL
));
906 struct ref_entry
*r
= search_ref_dir(dir
, refname
);
908 if (r
!= NULL
&& r
->flag
& REF_KNOWS_PEELED
) {
909 hashcpy(sha1
, r
->u
.value
.peeled
);
915 o
= parse_object(base
);
916 if (o
&& o
->type
== OBJ_TAG
) {
917 o
= deref_tag(o
, refname
, 0);
919 hashcpy(sha1
, o
->sha1
);
926 struct warn_if_dangling_data
{
932 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
933 int flags
, void *cb_data
)
935 struct warn_if_dangling_data
*d
= cb_data
;
936 const char *resolves_to
;
937 unsigned char junk
[20];
939 if (!(flags
& REF_ISSYMREF
))
942 resolves_to
= resolve_ref_unsafe(refname
, junk
, 0, NULL
);
943 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
946 fprintf(d
->fp
, d
->msg_fmt
, refname
);
950 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
952 struct warn_if_dangling_data data
;
955 data
.refname
= refname
;
956 data
.msg_fmt
= msg_fmt
;
957 for_each_rawref(warn_if_dangling_symref
, &data
);
960 static int do_for_each_ref(const char *submodule
, const char *base
, each_ref_fn fn
,
961 int trim
, int flags
, void *cb_data
)
963 struct ref_cache
*refs
= get_ref_cache(submodule
);
964 struct ref_dir
*packed_refs
= get_packed_refs(refs
);
965 struct ref_dir
*loose_refs
= get_loose_refs(refs
);
966 sort_ref_dir(packed_refs
);
967 sort_ref_dir(loose_refs
);
968 return do_for_each_ref_in_dirs(packed_refs
,
970 base
, fn
, trim
, flags
, cb_data
);
973 static int do_head_ref(const char *submodule
, each_ref_fn fn
, void *cb_data
)
975 unsigned char sha1
[20];
979 if (resolve_gitlink_ref(submodule
, "HEAD", sha1
) == 0)
980 return fn("HEAD", sha1
, 0, cb_data
);
985 if (!read_ref_full("HEAD", sha1
, 1, &flag
))
986 return fn("HEAD", sha1
, flag
, cb_data
);
991 int head_ref(each_ref_fn fn
, void *cb_data
)
993 return do_head_ref(NULL
, fn
, cb_data
);
996 int head_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
998 return do_head_ref(submodule
, fn
, cb_data
);
1001 int for_each_ref(each_ref_fn fn
, void *cb_data
)
1003 return do_for_each_ref(NULL
, "", fn
, 0, 0, cb_data
);
1006 int for_each_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
1008 return do_for_each_ref(submodule
, "", fn
, 0, 0, cb_data
);
1011 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
1013 return do_for_each_ref(NULL
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
1016 int for_each_ref_in_submodule(const char *submodule
, const char *prefix
,
1017 each_ref_fn fn
, void *cb_data
)
1019 return do_for_each_ref(submodule
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
1022 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
1024 return for_each_ref_in("refs/tags/", fn
, cb_data
);
1027 int for_each_tag_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
1029 return for_each_ref_in_submodule(submodule
, "refs/tags/", fn
, cb_data
);
1032 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
1034 return for_each_ref_in("refs/heads/", fn
, cb_data
);
1037 int for_each_branch_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
1039 return for_each_ref_in_submodule(submodule
, "refs/heads/", fn
, cb_data
);
1042 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
1044 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
1047 int for_each_remote_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
1049 return for_each_ref_in_submodule(submodule
, "refs/remotes/", fn
, cb_data
);
1052 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
1054 return do_for_each_ref(NULL
, "refs/replace/", fn
, 13, 0, cb_data
);
1057 int head_ref_namespaced(each_ref_fn fn
, void *cb_data
)
1059 struct strbuf buf
= STRBUF_INIT
;
1061 unsigned char sha1
[20];
1064 strbuf_addf(&buf
, "%sHEAD", get_git_namespace());
1065 if (!read_ref_full(buf
.buf
, sha1
, 1, &flag
))
1066 ret
= fn(buf
.buf
, sha1
, flag
, cb_data
);
1067 strbuf_release(&buf
);
1072 int for_each_namespaced_ref(each_ref_fn fn
, void *cb_data
)
1074 struct strbuf buf
= STRBUF_INIT
;
1076 strbuf_addf(&buf
, "%srefs/", get_git_namespace());
1077 ret
= do_for_each_ref(NULL
, buf
.buf
, fn
, 0, 0, cb_data
);
1078 strbuf_release(&buf
);
1082 int for_each_glob_ref_in(each_ref_fn fn
, const char *pattern
,
1083 const char *prefix
, void *cb_data
)
1085 struct strbuf real_pattern
= STRBUF_INIT
;
1086 struct ref_filter filter
;
1089 if (!prefix
&& prefixcmp(pattern
, "refs/"))
1090 strbuf_addstr(&real_pattern
, "refs/");
1092 strbuf_addstr(&real_pattern
, prefix
);
1093 strbuf_addstr(&real_pattern
, pattern
);
1095 if (!has_glob_specials(pattern
)) {
1096 /* Append implied '/' '*' if not present. */
1097 if (real_pattern
.buf
[real_pattern
.len
- 1] != '/')
1098 strbuf_addch(&real_pattern
, '/');
1099 /* No need to check for '*', there is none. */
1100 strbuf_addch(&real_pattern
, '*');
1103 filter
.pattern
= real_pattern
.buf
;
1105 filter
.cb_data
= cb_data
;
1106 ret
= for_each_ref(filter_refs
, &filter
);
1108 strbuf_release(&real_pattern
);
1112 int for_each_glob_ref(each_ref_fn fn
, const char *pattern
, void *cb_data
)
1114 return for_each_glob_ref_in(fn
, pattern
, NULL
, cb_data
);
1117 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
1119 return do_for_each_ref(NULL
, "", fn
, 0,
1120 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
1123 const char *prettify_refname(const char *name
)
1126 !prefixcmp(name
, "refs/heads/") ? 11 :
1127 !prefixcmp(name
, "refs/tags/") ? 10 :
1128 !prefixcmp(name
, "refs/remotes/") ? 13 :
1132 const char *ref_rev_parse_rules
[] = {
1137 "refs/remotes/%.*s",
1138 "refs/remotes/%.*s/HEAD",
1142 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
1145 const int abbrev_name_len
= strlen(abbrev_name
);
1147 for (p
= rules
; *p
; p
++) {
1148 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
1156 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
1157 const unsigned char *old_sha1
, int mustexist
)
1159 if (read_ref_full(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
1160 error("Can't verify ref %s", lock
->ref_name
);
1164 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
1165 error("Ref %s is at %s but expected %s", lock
->ref_name
,
1166 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
1173 static int remove_empty_directories(const char *file
)
1175 /* we want to create a file but there is a directory there;
1176 * if that is an empty directory (or a directory that contains
1177 * only empty directories), remove them.
1182 strbuf_init(&path
, 20);
1183 strbuf_addstr(&path
, file
);
1185 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
1187 strbuf_release(&path
);
1193 * *string and *len will only be substituted, and *string returned (for
1194 * later free()ing) if the string passed in is a magic short-hand form
1197 static char *substitute_branch_name(const char **string
, int *len
)
1199 struct strbuf buf
= STRBUF_INIT
;
1200 int ret
= interpret_branch_name(*string
, &buf
);
1204 *string
= strbuf_detach(&buf
, &size
);
1206 return (char *)*string
;
1212 int dwim_ref(const char *str
, int len
, unsigned char *sha1
, char **ref
)
1214 char *last_branch
= substitute_branch_name(&str
, &len
);
1219 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1220 char fullref
[PATH_MAX
];
1221 unsigned char sha1_from_ref
[20];
1222 unsigned char *this_result
;
1225 this_result
= refs_found
? sha1_from_ref
: sha1
;
1226 mksnpath(fullref
, sizeof(fullref
), *p
, len
, str
);
1227 r
= resolve_ref_unsafe(fullref
, this_result
, 1, &flag
);
1231 if (!warn_ambiguous_refs
)
1233 } else if ((flag
& REF_ISSYMREF
) && strcmp(fullref
, "HEAD")) {
1234 warning("ignoring dangling symref %s.", fullref
);
1235 } else if ((flag
& REF_ISBROKEN
) && strchr(fullref
, '/')) {
1236 warning("ignoring broken ref %s.", fullref
);
1243 int dwim_log(const char *str
, int len
, unsigned char *sha1
, char **log
)
1245 char *last_branch
= substitute_branch_name(&str
, &len
);
1250 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1252 unsigned char hash
[20];
1253 char path
[PATH_MAX
];
1254 const char *ref
, *it
;
1256 mksnpath(path
, sizeof(path
), *p
, len
, str
);
1257 ref
= resolve_ref_unsafe(path
, hash
, 1, NULL
);
1260 if (!stat(git_path("logs/%s", path
), &st
) &&
1261 S_ISREG(st
.st_mode
))
1263 else if (strcmp(ref
, path
) &&
1264 !stat(git_path("logs/%s", ref
), &st
) &&
1265 S_ISREG(st
.st_mode
))
1269 if (!logs_found
++) {
1271 hashcpy(sha1
, hash
);
1273 if (!warn_ambiguous_refs
)
1280 static struct ref_lock
*lock_ref_sha1_basic(const char *refname
,
1281 const unsigned char *old_sha1
,
1282 int flags
, int *type_p
)
1285 const char *orig_refname
= refname
;
1286 struct ref_lock
*lock
;
1289 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1292 lock
= xcalloc(1, sizeof(struct ref_lock
));
1295 refname
= resolve_ref_unsafe(refname
, lock
->old_sha1
, mustexist
, &type
);
1296 if (!refname
&& errno
== EISDIR
) {
1297 /* we are trying to lock foo but we used to
1298 * have foo/bar which now does not exist;
1299 * it is normal for the empty directory 'foo'
1302 ref_file
= git_path("%s", orig_refname
);
1303 if (remove_empty_directories(ref_file
)) {
1305 error("there are still refs under '%s'", orig_refname
);
1308 refname
= resolve_ref_unsafe(orig_refname
, lock
->old_sha1
, mustexist
, &type
);
1314 error("unable to resolve reference %s: %s",
1315 orig_refname
, strerror(errno
));
1318 missing
= is_null_sha1(lock
->old_sha1
);
1319 /* When the ref did not exist and we are creating it,
1320 * make sure there is no existing ref that is packed
1321 * whose name begins with our refname, nor a ref whose
1322 * name is a proper prefix of our refname.
1325 !is_refname_available(refname
, NULL
, get_packed_refs(get_ref_cache(NULL
)))) {
1326 last_errno
= ENOTDIR
;
1330 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1332 lflags
= LOCK_DIE_ON_ERROR
;
1333 if (flags
& REF_NODEREF
) {
1334 refname
= orig_refname
;
1335 lflags
|= LOCK_NODEREF
;
1337 lock
->ref_name
= xstrdup(refname
);
1338 lock
->orig_ref_name
= xstrdup(orig_refname
);
1339 ref_file
= git_path("%s", refname
);
1341 lock
->force_write
= 1;
1342 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
1343 lock
->force_write
= 1;
1345 if (safe_create_leading_directories(ref_file
)) {
1347 error("unable to create directory for %s", ref_file
);
1351 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
1352 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
1360 struct ref_lock
*lock_ref_sha1(const char *refname
, const unsigned char *old_sha1
)
1362 char refpath
[PATH_MAX
];
1363 if (check_refname_format(refname
, 0))
1365 strcpy(refpath
, mkpath("refs/%s", refname
));
1366 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
1369 struct ref_lock
*lock_any_ref_for_update(const char *refname
,
1370 const unsigned char *old_sha1
, int flags
)
1372 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
1374 return lock_ref_sha1_basic(refname
, old_sha1
, flags
, NULL
);
1377 struct repack_without_ref_sb
{
1378 const char *refname
;
1382 static int repack_without_ref_fn(const char *refname
, const unsigned char *sha1
,
1383 int flags
, void *cb_data
)
1385 struct repack_without_ref_sb
*data
= cb_data
;
1386 char line
[PATH_MAX
+ 100];
1389 if (!strcmp(data
->refname
, refname
))
1391 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1392 sha1_to_hex(sha1
), refname
);
1393 /* this should not happen but just being defensive */
1394 if (len
> sizeof(line
))
1395 die("too long a refname '%s'", refname
);
1396 write_or_die(data
->fd
, line
, len
);
1400 static struct lock_file packlock
;
1402 static int repack_without_ref(const char *refname
)
1404 struct repack_without_ref_sb data
;
1405 struct ref_dir
*packed
= get_packed_refs(get_ref_cache(NULL
));
1406 sort_ref_dir(packed
);
1407 if (search_ref_dir(packed
, refname
) == NULL
)
1409 data
.refname
= refname
;
1410 data
.fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
1412 unable_to_lock_error(git_path("packed-refs"), errno
);
1413 return error("cannot delete '%s' from packed refs", refname
);
1415 do_for_each_ref_in_dir(packed
, 0, "", repack_without_ref_fn
, 0, 0, &data
);
1416 return commit_lock_file(&packlock
);
1419 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1421 struct ref_lock
*lock
;
1422 int err
, i
= 0, ret
= 0, flag
= 0;
1424 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1427 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1431 if (!(delopt
& REF_NODEREF
)) {
1432 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1433 lock
->lk
->filename
[i
] = 0;
1434 path
= lock
->lk
->filename
;
1436 path
= git_path("%s", refname
);
1438 err
= unlink_or_warn(path
);
1439 if (err
&& errno
!= ENOENT
)
1442 if (!(delopt
& REF_NODEREF
))
1443 lock
->lk
->filename
[i
] = '.';
1445 /* removing the loose one could have resurrected an earlier
1446 * packed one. Also, if it was not loose we need to repack
1449 ret
|= repack_without_ref(refname
);
1451 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1452 invalidate_ref_cache(NULL
);
1458 * People using contrib's git-new-workdir have .git/logs/refs ->
1459 * /some/other/path/.git/logs/refs, and that may live on another device.
1461 * IOW, to avoid cross device rename errors, the temporary renamed log must
1462 * live into logs/refs.
1464 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1466 int rename_ref(const char *oldrefname
, const char *newrefname
, const char *logmsg
)
1468 unsigned char sha1
[20], orig_sha1
[20];
1469 int flag
= 0, logmoved
= 0;
1470 struct ref_lock
*lock
;
1471 struct stat loginfo
;
1472 int log
= !lstat(git_path("logs/%s", oldrefname
), &loginfo
);
1473 const char *symref
= NULL
;
1474 struct ref_cache
*refs
= get_ref_cache(NULL
);
1476 if (log
&& S_ISLNK(loginfo
.st_mode
))
1477 return error("reflog for %s is a symlink", oldrefname
);
1479 symref
= resolve_ref_unsafe(oldrefname
, orig_sha1
, 1, &flag
);
1480 if (flag
& REF_ISSYMREF
)
1481 return error("refname %s is a symbolic ref, renaming it is not supported",
1484 return error("refname %s not found", oldrefname
);
1486 if (!is_refname_available(newrefname
, oldrefname
, get_packed_refs(refs
)))
1489 if (!is_refname_available(newrefname
, oldrefname
, get_loose_refs(refs
)))
1492 if (log
&& rename(git_path("logs/%s", oldrefname
), git_path(TMP_RENAMED_LOG
)))
1493 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG
": %s",
1494 oldrefname
, strerror(errno
));
1496 if (delete_ref(oldrefname
, orig_sha1
, REF_NODEREF
)) {
1497 error("unable to delete old %s", oldrefname
);
1501 if (!read_ref_full(newrefname
, sha1
, 1, &flag
) &&
1502 delete_ref(newrefname
, sha1
, REF_NODEREF
)) {
1503 if (errno
==EISDIR
) {
1504 if (remove_empty_directories(git_path("%s", newrefname
))) {
1505 error("Directory not empty: %s", newrefname
);
1509 error("unable to delete existing %s", newrefname
);
1514 if (log
&& safe_create_leading_directories(git_path("logs/%s", newrefname
))) {
1515 error("unable to create directory for %s", newrefname
);
1520 if (log
&& rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", newrefname
))) {
1521 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1523 * rename(a, b) when b is an existing
1524 * directory ought to result in ISDIR, but
1525 * Solaris 5.8 gives ENOTDIR. Sheesh.
1527 if (remove_empty_directories(git_path("logs/%s", newrefname
))) {
1528 error("Directory not empty: logs/%s", newrefname
);
1533 error("unable to move logfile "TMP_RENAMED_LOG
" to logs/%s: %s",
1534 newrefname
, strerror(errno
));
1540 lock
= lock_ref_sha1_basic(newrefname
, NULL
, 0, NULL
);
1542 error("unable to lock %s for update", newrefname
);
1545 lock
->force_write
= 1;
1546 hashcpy(lock
->old_sha1
, orig_sha1
);
1547 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1548 error("unable to write current sha1 into %s", newrefname
);
1555 lock
= lock_ref_sha1_basic(oldrefname
, NULL
, 0, NULL
);
1557 error("unable to lock %s for rollback", oldrefname
);
1561 lock
->force_write
= 1;
1562 flag
= log_all_ref_updates
;
1563 log_all_ref_updates
= 0;
1564 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1565 error("unable to write current sha1 into %s", oldrefname
);
1566 log_all_ref_updates
= flag
;
1569 if (logmoved
&& rename(git_path("logs/%s", newrefname
), git_path("logs/%s", oldrefname
)))
1570 error("unable to restore logfile %s from %s: %s",
1571 oldrefname
, newrefname
, strerror(errno
));
1572 if (!logmoved
&& log
&&
1573 rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", oldrefname
)))
1574 error("unable to restore logfile %s from "TMP_RENAMED_LOG
": %s",
1575 oldrefname
, strerror(errno
));
1580 int close_ref(struct ref_lock
*lock
)
1582 if (close_lock_file(lock
->lk
))
1588 int commit_ref(struct ref_lock
*lock
)
1590 if (commit_lock_file(lock
->lk
))
1596 void unlock_ref(struct ref_lock
*lock
)
1598 /* Do not free lock->lk -- atexit() still looks at them */
1600 rollback_lock_file(lock
->lk
);
1601 free(lock
->ref_name
);
1602 free(lock
->orig_ref_name
);
1607 * copy the reflog message msg to buf, which has been allocated sufficiently
1608 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1609 * because reflog file is one line per entry.
1611 static int copy_msg(char *buf
, const char *msg
)
1618 while ((c
= *msg
++)) {
1619 if (wasspace
&& isspace(c
))
1621 wasspace
= isspace(c
);
1626 while (buf
< cp
&& isspace(cp
[-1]))
1632 int log_ref_setup(const char *refname
, char *logfile
, int bufsize
)
1634 int logfd
, oflags
= O_APPEND
| O_WRONLY
;
1636 git_snpath(logfile
, bufsize
, "logs/%s", refname
);
1637 if (log_all_ref_updates
&&
1638 (!prefixcmp(refname
, "refs/heads/") ||
1639 !prefixcmp(refname
, "refs/remotes/") ||
1640 !prefixcmp(refname
, "refs/notes/") ||
1641 !strcmp(refname
, "HEAD"))) {
1642 if (safe_create_leading_directories(logfile
) < 0)
1643 return error("unable to create directory for %s",
1648 logfd
= open(logfile
, oflags
, 0666);
1650 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1653 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1654 if (remove_empty_directories(logfile
)) {
1655 return error("There are still logs under '%s'",
1658 logfd
= open(logfile
, oflags
, 0666);
1662 return error("Unable to append to %s: %s",
1663 logfile
, strerror(errno
));
1666 adjust_shared_perm(logfile
);
1671 static int log_ref_write(const char *refname
, const unsigned char *old_sha1
,
1672 const unsigned char *new_sha1
, const char *msg
)
1674 int logfd
, result
, written
, oflags
= O_APPEND
| O_WRONLY
;
1675 unsigned maxlen
, len
;
1677 char log_file
[PATH_MAX
];
1679 const char *committer
;
1681 if (log_all_ref_updates
< 0)
1682 log_all_ref_updates
= !is_bare_repository();
1684 result
= log_ref_setup(refname
, log_file
, sizeof(log_file
));
1688 logfd
= open(log_file
, oflags
);
1691 msglen
= msg
? strlen(msg
) : 0;
1692 committer
= git_committer_info(0);
1693 maxlen
= strlen(committer
) + msglen
+ 100;
1694 logrec
= xmalloc(maxlen
);
1695 len
= sprintf(logrec
, "%s %s %s\n",
1696 sha1_to_hex(old_sha1
),
1697 sha1_to_hex(new_sha1
),
1700 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1701 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1703 if (close(logfd
) != 0 || written
!= len
)
1704 return error("Unable to append to %s", log_file
);
1708 static int is_branch(const char *refname
)
1710 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1713 int write_ref_sha1(struct ref_lock
*lock
,
1714 const unsigned char *sha1
, const char *logmsg
)
1716 static char term
= '\n';
1721 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1725 o
= parse_object(sha1
);
1727 error("Trying to write ref %s with nonexistent object %s",
1728 lock
->ref_name
, sha1_to_hex(sha1
));
1732 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1733 error("Trying to write non-commit object %s to branch %s",
1734 sha1_to_hex(sha1
), lock
->ref_name
);
1738 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1739 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1740 || close_ref(lock
) < 0) {
1741 error("Couldn't write %s", lock
->lk
->filename
);
1745 clear_loose_ref_cache(get_ref_cache(NULL
));
1746 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1747 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1748 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1752 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1754 * Special hack: If a branch is updated directly and HEAD
1755 * points to it (may happen on the remote side of a push
1756 * for example) then logically the HEAD reflog should be
1758 * A generic solution implies reverse symref information,
1759 * but finding all symrefs pointing to the given branch
1760 * would be rather costly for this rare event (the direct
1761 * update of a branch) to be worth it. So let's cheat and
1762 * check with HEAD only which should cover 99% of all usage
1763 * scenarios (even 100% of the default ones).
1765 unsigned char head_sha1
[20];
1767 const char *head_ref
;
1768 head_ref
= resolve_ref_unsafe("HEAD", head_sha1
, 1, &head_flag
);
1769 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1770 !strcmp(head_ref
, lock
->ref_name
))
1771 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1773 if (commit_ref(lock
)) {
1774 error("Couldn't set %s", lock
->ref_name
);
1782 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1785 const char *lockpath
;
1787 int fd
, len
, written
;
1788 char *git_HEAD
= git_pathdup("%s", ref_target
);
1789 unsigned char old_sha1
[20], new_sha1
[20];
1791 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1794 if (safe_create_leading_directories(git_HEAD
) < 0)
1795 return error("unable to create directory for %s", git_HEAD
);
1797 #ifndef NO_SYMLINK_HEAD
1798 if (prefer_symlink_refs
) {
1800 if (!symlink(refs_heads_master
, git_HEAD
))
1802 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1806 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1807 if (sizeof(ref
) <= len
) {
1808 error("refname too long: %s", refs_heads_master
);
1809 goto error_free_return
;
1811 lockpath
= mkpath("%s.lock", git_HEAD
);
1812 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1814 error("Unable to open %s for writing", lockpath
);
1815 goto error_free_return
;
1817 written
= write_in_full(fd
, ref
, len
);
1818 if (close(fd
) != 0 || written
!= len
) {
1819 error("Unable to write to %s", lockpath
);
1820 goto error_unlink_return
;
1822 if (rename(lockpath
, git_HEAD
) < 0) {
1823 error("Unable to create %s", git_HEAD
);
1824 goto error_unlink_return
;
1826 if (adjust_shared_perm(git_HEAD
)) {
1827 error("Unable to fix permissions on %s", lockpath
);
1828 error_unlink_return
:
1829 unlink_or_warn(lockpath
);
1835 #ifndef NO_SYMLINK_HEAD
1838 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1839 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1845 static char *ref_msg(const char *line
, const char *endp
)
1849 ep
= memchr(line
, '\n', endp
- line
);
1852 return xmemdupz(line
, ep
- line
);
1855 int read_ref_at(const char *refname
, unsigned long at_time
, int cnt
,
1856 unsigned char *sha1
, char **msg
,
1857 unsigned long *cutoff_time
, int *cutoff_tz
, int *cutoff_cnt
)
1859 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1861 int logfd
, tz
, reccnt
= 0;
1864 unsigned char logged_sha1
[20];
1868 logfile
= git_path("logs/%s", refname
);
1869 logfd
= open(logfile
, O_RDONLY
, 0);
1871 die_errno("Unable to read log '%s'", logfile
);
1874 die("Log %s is empty.", logfile
);
1875 mapsz
= xsize_t(st
.st_size
);
1876 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1877 logdata
= log_mapped
;
1881 rec
= logend
= logdata
+ st
.st_size
;
1882 while (logdata
< rec
) {
1884 if (logdata
< rec
&& *(rec
-1) == '\n')
1887 while (logdata
< rec
&& *(rec
-1) != '\n') {
1893 die("Log %s is corrupt.", logfile
);
1894 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1895 if (date
<= at_time
|| cnt
== 0) {
1896 tz
= strtoul(tz_c
, NULL
, 10);
1898 *msg
= ref_msg(rec
, logend
);
1900 *cutoff_time
= date
;
1904 *cutoff_cnt
= reccnt
- 1;
1906 if (get_sha1_hex(lastrec
, logged_sha1
))
1907 die("Log %s is corrupt.", logfile
);
1908 if (get_sha1_hex(rec
+ 41, sha1
))
1909 die("Log %s is corrupt.", logfile
);
1910 if (hashcmp(logged_sha1
, sha1
)) {
1911 warning("Log %s has gap after %s.",
1912 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1915 else if (date
== at_time
) {
1916 if (get_sha1_hex(rec
+ 41, sha1
))
1917 die("Log %s is corrupt.", logfile
);
1920 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1921 die("Log %s is corrupt.", logfile
);
1922 if (hashcmp(logged_sha1
, sha1
)) {
1923 warning("Log %s unexpectedly ended on %s.",
1924 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1927 munmap(log_mapped
, mapsz
);
1936 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1938 if (rec
== logend
|| *rec
== '\n')
1939 die("Log %s is corrupt.", logfile
);
1940 date
= strtoul(rec
+ 1, &tz_c
, 10);
1941 tz
= strtoul(tz_c
, NULL
, 10);
1942 if (get_sha1_hex(logdata
, sha1
))
1943 die("Log %s is corrupt.", logfile
);
1944 if (is_null_sha1(sha1
)) {
1945 if (get_sha1_hex(logdata
+ 41, sha1
))
1946 die("Log %s is corrupt.", logfile
);
1949 *msg
= ref_msg(logdata
, logend
);
1950 munmap(log_mapped
, mapsz
);
1953 *cutoff_time
= date
;
1957 *cutoff_cnt
= reccnt
;
1961 int for_each_recent_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1963 const char *logfile
;
1965 struct strbuf sb
= STRBUF_INIT
;
1968 logfile
= git_path("logs/%s", refname
);
1969 logfp
= fopen(logfile
, "r");
1974 struct stat statbuf
;
1975 if (fstat(fileno(logfp
), &statbuf
) ||
1976 statbuf
.st_size
< ofs
||
1977 fseek(logfp
, -ofs
, SEEK_END
) ||
1978 strbuf_getwholeline(&sb
, logfp
, '\n')) {
1980 strbuf_release(&sb
);
1985 while (!strbuf_getwholeline(&sb
, logfp
, '\n')) {
1986 unsigned char osha1
[20], nsha1
[20];
1987 char *email_end
, *message
;
1988 unsigned long timestamp
;
1991 /* old SP new SP name <email> SP time TAB msg LF */
1992 if (sb
.len
< 83 || sb
.buf
[sb
.len
- 1] != '\n' ||
1993 get_sha1_hex(sb
.buf
, osha1
) || sb
.buf
[40] != ' ' ||
1994 get_sha1_hex(sb
.buf
+ 41, nsha1
) || sb
.buf
[81] != ' ' ||
1995 !(email_end
= strchr(sb
.buf
+ 82, '>')) ||
1996 email_end
[1] != ' ' ||
1997 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1998 !message
|| message
[0] != ' ' ||
1999 (message
[1] != '+' && message
[1] != '-') ||
2000 !isdigit(message
[2]) || !isdigit(message
[3]) ||
2001 !isdigit(message
[4]) || !isdigit(message
[5]))
2002 continue; /* corrupt? */
2003 email_end
[1] = '\0';
2004 tz
= strtol(message
+ 1, NULL
, 10);
2005 if (message
[6] != '\t')
2009 ret
= fn(osha1
, nsha1
, sb
.buf
+ 82, timestamp
, tz
, message
,
2015 strbuf_release(&sb
);
2019 int for_each_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, void *cb_data
)
2021 return for_each_recent_reflog_ent(refname
, fn
, 0, cb_data
);
2024 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
2026 DIR *d
= opendir(git_path("logs/%s", base
));
2031 int baselen
= strlen(base
);
2032 char *log
= xmalloc(baselen
+ 257);
2034 memcpy(log
, base
, baselen
);
2035 if (baselen
&& base
[baselen
-1] != '/')
2036 log
[baselen
++] = '/';
2038 while ((de
= readdir(d
)) != NULL
) {
2042 if (de
->d_name
[0] == '.')
2044 namelen
= strlen(de
->d_name
);
2047 if (has_extension(de
->d_name
, ".lock"))
2049 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
2050 if (stat(git_path("logs/%s", log
), &st
) < 0)
2052 if (S_ISDIR(st
.st_mode
)) {
2053 retval
= do_for_each_reflog(log
, fn
, cb_data
);
2055 unsigned char sha1
[20];
2056 if (read_ref_full(log
, sha1
, 0, NULL
))
2057 retval
= error("bad ref for %s", log
);
2059 retval
= fn(log
, sha1
, 0, cb_data
);
2072 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
2074 return do_for_each_reflog("", fn
, cb_data
);
2077 int update_ref(const char *action
, const char *refname
,
2078 const unsigned char *sha1
, const unsigned char *oldval
,
2079 int flags
, enum action_on_err onerr
)
2081 static struct ref_lock
*lock
;
2082 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
2084 const char *str
= "Cannot lock the ref '%s'.";
2086 case MSG_ON_ERR
: error(str
, refname
); break;
2087 case DIE_ON_ERR
: die(str
, refname
); break;
2088 case QUIET_ON_ERR
: break;
2092 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
2093 const char *str
= "Cannot update the ref '%s'.";
2095 case MSG_ON_ERR
: error(str
, refname
); break;
2096 case DIE_ON_ERR
: die(str
, refname
); break;
2097 case QUIET_ON_ERR
: break;
2104 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
2106 for ( ; list
; list
= list
->next
)
2107 if (!strcmp(list
->name
, name
))
2108 return (struct ref
*)list
;
2113 * generate a format suitable for scanf from a ref_rev_parse_rules
2114 * rule, that is replace the "%.*s" spec with a "%s" spec
2116 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
2120 spec
= strstr(rule
, "%.*s");
2121 if (!spec
|| strstr(spec
+ 4, "%.*s"))
2122 die("invalid rule in ref_rev_parse_rules: %s", rule
);
2124 /* copy all until spec */
2125 strncpy(scanf_fmt
, rule
, spec
- rule
);
2126 scanf_fmt
[spec
- rule
] = '\0';
2128 strcat(scanf_fmt
, "%s");
2129 /* copy remaining rule */
2130 strcat(scanf_fmt
, spec
+ 4);
2135 char *shorten_unambiguous_ref(const char *refname
, int strict
)
2138 static char **scanf_fmts
;
2139 static int nr_rules
;
2142 /* pre generate scanf formats from ref_rev_parse_rules[] */
2144 size_t total_len
= 0;
2146 /* the rule list is NULL terminated, count them first */
2147 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
2148 /* no +1 because strlen("%s") < strlen("%.*s") */
2149 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
2151 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
2154 for (i
= 0; i
< nr_rules
; i
++) {
2155 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
2157 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
2158 total_len
+= strlen(ref_rev_parse_rules
[i
]);
2162 /* bail out if there are no rules */
2164 return xstrdup(refname
);
2166 /* buffer for scanf result, at most refname must fit */
2167 short_name
= xstrdup(refname
);
2169 /* skip first rule, it will always match */
2170 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
2172 int rules_to_fail
= i
;
2175 if (1 != sscanf(refname
, scanf_fmts
[i
], short_name
))
2178 short_name_len
= strlen(short_name
);
2181 * in strict mode, all (except the matched one) rules
2182 * must fail to resolve to a valid non-ambiguous ref
2185 rules_to_fail
= nr_rules
;
2188 * check if the short name resolves to a valid ref,
2189 * but use only rules prior to the matched one
2191 for (j
= 0; j
< rules_to_fail
; j
++) {
2192 const char *rule
= ref_rev_parse_rules
[j
];
2193 char refname
[PATH_MAX
];
2195 /* skip matched rule */
2200 * the short name is ambiguous, if it resolves
2201 * (with this previous rule) to a valid ref
2202 * read_ref() returns 0 on success
2204 mksnpath(refname
, sizeof(refname
),
2205 rule
, short_name_len
, short_name
);
2206 if (ref_exists(refname
))
2211 * short name is non-ambiguous if all previous rules
2212 * haven't resolved to a valid ref
2214 if (j
== rules_to_fail
)
2219 return xstrdup(refname
);