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 -1; /* 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. */
108 * Entries with index 0 <= i < sorted are sorted by name. New
109 * entries are appended to the list unsorted, and are sorted
110 * only when required; thus we avoid the need to sort the list
111 * after the addition of every reference.
115 struct ref_entry
**refs
;
118 /* ISSYMREF=0x01, ISPACKED=0x02 and ISBROKEN=0x04 are public interfaces */
119 #define REF_KNOWS_PEELED 0x10
122 unsigned char flag
; /* ISSYMREF? ISPACKED? */
123 unsigned char sha1
[20];
124 unsigned char peeled
[20];
125 /* The full name of the reference (e.g., "refs/heads/master"): */
126 char name
[FLEX_ARRAY
];
129 static struct ref_entry
*create_ref_entry(const char *refname
,
130 const unsigned char *sha1
, int flag
,
134 struct ref_entry
*ref
;
137 check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
|REFNAME_DOT_COMPONENT
))
138 die("Reference has invalid format: '%s'", refname
);
139 len
= strlen(refname
) + 1;
140 ref
= xmalloc(sizeof(struct ref_entry
) + len
);
141 hashcpy(ref
->sha1
, sha1
);
142 hashclr(ref
->peeled
);
143 memcpy(ref
->name
, refname
, len
);
148 /* Add a ref_entry to the end of the ref_array (unsorted). */
149 static void add_ref(struct ref_array
*refs
, struct ref_entry
*ref
)
151 ALLOC_GROW(refs
->refs
, refs
->nr
+ 1, refs
->alloc
);
152 refs
->refs
[refs
->nr
++] = ref
;
155 static void clear_ref_array(struct ref_array
*array
)
158 for (i
= 0; i
< array
->nr
; i
++)
159 free(array
->refs
[i
]);
161 array
->sorted
= array
->nr
= array
->alloc
= 0;
165 static int ref_entry_cmp(const void *a
, const void *b
)
167 struct ref_entry
*one
= *(struct ref_entry
**)a
;
168 struct ref_entry
*two
= *(struct ref_entry
**)b
;
169 return strcmp(one
->name
, two
->name
);
172 static void sort_ref_array(struct ref_array
*array
);
174 static struct ref_entry
*search_ref_array(struct ref_array
*array
, const char *refname
)
176 struct ref_entry
*e
, **r
;
184 sort_ref_array(array
);
185 len
= strlen(refname
) + 1;
186 e
= xmalloc(sizeof(struct ref_entry
) + len
);
187 memcpy(e
->name
, refname
, len
);
189 r
= bsearch(&e
, array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
200 * Emit a warning and return true iff ref1 and ref2 have the same name
201 * and the same sha1. Die if they have the same name but different
204 static int is_dup_ref(const struct ref_entry
*ref1
, const struct ref_entry
*ref2
)
206 if (!strcmp(ref1
->name
, ref2
->name
)) {
207 /* Duplicate name; make sure that the SHA1s match: */
208 if (hashcmp(ref1
->sha1
, ref2
->sha1
))
209 die("Duplicated ref, and SHA1s don't match: %s",
211 warning("Duplicated ref: %s", ref1
->name
);
219 * Sort the entries in array (if they are not already sorted).
221 static void sort_ref_array(struct ref_array
*array
)
226 * This check also prevents passing a zero-length array to qsort(),
227 * which is a problem on some platforms.
229 if (array
->sorted
== array
->nr
)
232 qsort(array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
234 /* Remove any duplicates from the ref_array */
236 for (j
= 1; j
< array
->nr
; j
++) {
237 if (is_dup_ref(array
->refs
[i
], array
->refs
[j
])) {
238 free(array
->refs
[j
]);
241 array
->refs
[++i
] = array
->refs
[j
];
243 array
->sorted
= array
->nr
= i
+ 1;
246 #define DO_FOR_EACH_INCLUDE_BROKEN 01
248 static struct ref_entry
*current_ref
;
250 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
251 int flags
, void *cb_data
, struct ref_entry
*entry
)
254 if (prefixcmp(entry
->name
, base
))
257 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
258 if (entry
->flag
& REF_ISBROKEN
)
259 return 0; /* ignore broken refs e.g. dangling symref */
260 if (!has_sha1_file(entry
->sha1
)) {
261 error("%s does not point to a valid object!", entry
->name
);
266 retval
= fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
272 * Call fn for each reference in array that has index in the range
273 * offset <= index < array->nr. This function does not sort the
274 * array; sorting should be done by the caller.
276 static int do_for_each_ref_in_array(struct ref_array
*array
, int offset
,
278 each_ref_fn fn
, int trim
, int flags
, void *cb_data
)
281 assert(array
->sorted
== array
->nr
);
282 for (i
= offset
; i
< array
->nr
; i
++) {
283 int retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, array
->refs
[i
]);
291 * Call fn for each reference in the union of array1 and array2, in
292 * order by refname. If an entry appears in both array1 and array2,
293 * then only process the version that is in array2. The input arrays
294 * must already be sorted.
296 static int do_for_each_ref_in_arrays(struct ref_array
*array1
,
297 struct ref_array
*array2
,
298 const char *base
, each_ref_fn fn
, int trim
,
299 int flags
, void *cb_data
)
304 assert(array1
->sorted
== array1
->nr
);
305 assert(array2
->sorted
== array2
->nr
);
306 while (i1
< array1
->nr
&& i2
< array2
->nr
) {
307 struct ref_entry
*e1
= array1
->refs
[i1
];
308 struct ref_entry
*e2
= array2
->refs
[i2
];
309 int cmp
= strcmp(e1
->name
, e2
->name
);
311 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, e1
);
314 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, e2
);
318 * There was a ref in array1 with the
319 * same name; ignore it.
328 return do_for_each_ref_in_array(array1
, i1
,
329 base
, fn
, trim
, flags
, cb_data
);
331 return do_for_each_ref_in_array(array2
, i2
,
332 base
, fn
, trim
, flags
, cb_data
);
337 * Return true iff refname1 and refname2 conflict with each other.
338 * Two reference names conflict if one of them exactly matches the
339 * leading components of the other; e.g., "foo/bar" conflicts with
340 * both "foo" and with "foo/bar/baz" but not with "foo/bar" or
343 static int names_conflict(const char *refname1
, const char *refname2
)
345 int len1
= strlen(refname1
);
346 int len2
= strlen(refname2
);
357 return !strncmp(refname1
, refname2
, cmplen
) && lead
[cmplen
] == '/';
361 * Return true iff a reference named refname could be created without
362 * conflicting with the name of an existing reference. If oldrefname
363 * is non-NULL, ignore potential conflicts with oldrefname (e.g.,
364 * because oldrefname is scheduled for deletion in the same
367 static int is_refname_available(const char *refname
, const char *oldrefname
,
368 struct ref_array
*array
)
371 for (i
= 0; i
< array
->nr
; i
++) {
372 struct ref_entry
*entry
= array
->refs
[i
];
373 if (oldrefname
&& !strcmp(oldrefname
, entry
->name
))
375 if (names_conflict(refname
, entry
->name
)) {
376 error("'%s' exists; cannot create '%s'",
377 entry
->name
, refname
);
385 * Future: need to be in "struct repository"
386 * when doing a full libification.
388 static struct ref_cache
{
389 struct ref_cache
*next
;
392 struct ref_array loose
;
393 struct ref_array packed
;
394 /* The submodule name, or "" for the main repo. */
395 char name
[FLEX_ARRAY
];
398 static void clear_packed_ref_cache(struct ref_cache
*refs
)
400 if (refs
->did_packed
)
401 clear_ref_array(&refs
->packed
);
402 refs
->did_packed
= 0;
405 static void clear_loose_ref_cache(struct ref_cache
*refs
)
408 clear_ref_array(&refs
->loose
);
412 static struct ref_cache
*create_ref_cache(const char *submodule
)
415 struct ref_cache
*refs
;
418 len
= strlen(submodule
) + 1;
419 refs
= xcalloc(1, sizeof(struct ref_cache
) + len
);
420 memcpy(refs
->name
, submodule
, len
);
425 * Return a pointer to a ref_cache for the specified submodule. For
426 * the main repository, use submodule==NULL. The returned structure
427 * will be allocated and initialized but not necessarily populated; it
428 * should not be freed.
430 static struct ref_cache
*get_ref_cache(const char *submodule
)
432 struct ref_cache
*refs
= ref_cache
;
436 if (!strcmp(submodule
, refs
->name
))
441 refs
= create_ref_cache(submodule
);
442 refs
->next
= ref_cache
;
447 void invalidate_ref_cache(const char *submodule
)
449 struct ref_cache
*refs
= get_ref_cache(submodule
);
450 clear_packed_ref_cache(refs
);
451 clear_loose_ref_cache(refs
);
455 * Parse one line from a packed-refs file. Write the SHA1 to sha1.
456 * Return a pointer to the refname within the line (null-terminated),
457 * or NULL if there was a problem.
459 static const char *parse_ref_line(char *line
, unsigned char *sha1
)
462 * 42: the answer to everything.
464 * In this case, it happens to be the answer to
465 * 40 (length of sha1 hex representation)
466 * +1 (space in between hex and name)
467 * +1 (newline at the end of the line)
469 int len
= strlen(line
) - 42;
473 if (get_sha1_hex(line
, sha1
) < 0)
475 if (!isspace(line
[40]))
480 if (line
[len
] != '\n')
487 static void read_packed_refs(FILE *f
, struct ref_array
*array
)
489 struct ref_entry
*last
= NULL
;
490 char refline
[PATH_MAX
];
491 int flag
= REF_ISPACKED
;
493 while (fgets(refline
, sizeof(refline
), f
)) {
494 unsigned char sha1
[20];
496 static const char header
[] = "# pack-refs with:";
498 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
499 const char *traits
= refline
+ sizeof(header
) - 1;
500 if (strstr(traits
, " peeled "))
501 flag
|= REF_KNOWS_PEELED
;
502 /* perhaps other traits later as well */
506 refname
= parse_ref_line(refline
, sha1
);
508 last
= create_ref_entry(refname
, sha1
, flag
, 1);
509 add_ref(array
, last
);
514 strlen(refline
) == 42 &&
515 refline
[41] == '\n' &&
516 !get_sha1_hex(refline
+ 1, sha1
))
517 hashcpy(last
->peeled
, sha1
);
521 static struct ref_array
*get_packed_refs(struct ref_cache
*refs
)
523 if (!refs
->did_packed
) {
524 const char *packed_refs_file
;
528 packed_refs_file
= git_path_submodule(refs
->name
, "packed-refs");
530 packed_refs_file
= git_path("packed-refs");
531 f
= fopen(packed_refs_file
, "r");
533 read_packed_refs(f
, &refs
->packed
);
536 refs
->did_packed
= 1;
538 return &refs
->packed
;
541 void add_packed_ref(const char *refname
, const unsigned char *sha1
)
543 add_ref(get_packed_refs(get_ref_cache(NULL
)),
544 create_ref_entry(refname
, sha1
, REF_ISPACKED
, 1));
547 static void get_ref_dir(struct ref_cache
*refs
, const char *base
,
548 struct ref_array
*array
)
554 path
= git_path_submodule(refs
->name
, "%s", base
);
556 path
= git_path("%s", base
);
562 int baselen
= strlen(base
);
563 char *refname
= xmalloc(baselen
+ 257);
565 memcpy(refname
, base
, baselen
);
566 if (baselen
&& base
[baselen
-1] != '/')
567 refname
[baselen
++] = '/';
569 while ((de
= readdir(dir
)) != NULL
) {
570 unsigned char sha1
[20];
576 if (de
->d_name
[0] == '.')
578 namelen
= strlen(de
->d_name
);
581 if (has_extension(de
->d_name
, ".lock"))
583 memcpy(refname
+ baselen
, de
->d_name
, namelen
+1);
585 ? git_path_submodule(refs
->name
, "%s", refname
)
586 : git_path("%s", refname
);
587 if (stat(refdir
, &st
) < 0)
589 if (S_ISDIR(st
.st_mode
)) {
590 get_ref_dir(refs
, refname
, array
);
596 if (resolve_gitlink_ref(refs
->name
, refname
, sha1
) < 0) {
598 flag
|= REF_ISBROKEN
;
600 } else if (read_ref_full(refname
, sha1
, 1, &flag
)) {
602 flag
|= REF_ISBROKEN
;
604 add_ref(array
, create_ref_entry(refname
, sha1
, flag
, 1));
611 static struct ref_array
*get_loose_refs(struct ref_cache
*refs
)
613 if (!refs
->did_loose
) {
614 get_ref_dir(refs
, "refs", &refs
->loose
);
620 /* We allow "recursive" symbolic refs. Only within reason, though */
622 #define MAXREFLEN (1024)
625 * Called by resolve_gitlink_ref_recursive() after it failed to read
626 * from the loose refs in ref_cache refs. Find <refname> in the
627 * packed-refs file for the submodule.
629 static int resolve_gitlink_packed_ref(struct ref_cache
*refs
,
630 const char *refname
, unsigned char *sha1
)
632 struct ref_entry
*ref
;
633 struct ref_array
*array
= get_packed_refs(refs
);
635 ref
= search_ref_array(array
, refname
);
639 memcpy(sha1
, ref
->sha1
, 20);
643 static int resolve_gitlink_ref_recursive(struct ref_cache
*refs
,
644 const char *refname
, unsigned char *sha1
,
648 char buffer
[128], *p
;
651 if (recursion
> MAXDEPTH
|| strlen(refname
) > MAXREFLEN
)
654 ? git_path_submodule(refs
->name
, "%s", refname
)
655 : git_path("%s", refname
);
656 fd
= open(path
, O_RDONLY
);
658 return resolve_gitlink_packed_ref(refs
, refname
, sha1
);
660 len
= read(fd
, buffer
, sizeof(buffer
)-1);
664 while (len
&& isspace(buffer
[len
-1]))
668 /* Was it a detached head or an old-fashioned symlink? */
669 if (!get_sha1_hex(buffer
, sha1
))
673 if (strncmp(buffer
, "ref:", 4))
679 return resolve_gitlink_ref_recursive(refs
, p
, sha1
, recursion
+1);
682 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *sha1
)
684 int len
= strlen(path
), retval
;
686 struct ref_cache
*refs
;
688 while (len
&& path
[len
-1] == '/')
692 submodule
= xstrndup(path
, len
);
693 refs
= get_ref_cache(submodule
);
696 retval
= resolve_gitlink_ref_recursive(refs
, refname
, sha1
, 0);
701 * Try to read ref from the packed references. On success, set sha1
702 * and return 0; otherwise, return -1.
704 static int get_packed_ref(const char *refname
, unsigned char *sha1
)
706 struct ref_array
*packed
= get_packed_refs(get_ref_cache(NULL
));
707 struct ref_entry
*entry
= search_ref_array(packed
, refname
);
709 hashcpy(sha1
, entry
->sha1
);
715 const char *resolve_ref_unsafe(const char *refname
, unsigned char *sha1
, int reading
, int *flag
)
717 int depth
= MAXDEPTH
;
720 static char refname_buffer
[256];
725 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
737 git_snpath(path
, sizeof(path
), "%s", refname
);
739 if (lstat(path
, &st
) < 0) {
743 * The loose reference file does not exist;
744 * check for a packed reference.
746 if (!get_packed_ref(refname
, sha1
)) {
748 *flag
|= REF_ISPACKED
;
751 /* The reference is not a packed reference, either. */
760 /* Follow "normalized" - ie "refs/.." symlinks by hand */
761 if (S_ISLNK(st
.st_mode
)) {
762 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
766 if (!prefixcmp(buffer
, "refs/") &&
767 !check_refname_format(buffer
, 0)) {
768 strcpy(refname_buffer
, buffer
);
769 refname
= refname_buffer
;
771 *flag
|= REF_ISSYMREF
;
776 /* Is it a directory? */
777 if (S_ISDIR(st
.st_mode
)) {
783 * Anything else, just open it and try to use it as
786 fd
= open(path
, O_RDONLY
);
789 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
793 while (len
&& isspace(buffer
[len
-1]))
798 * Is it a symbolic ref?
800 if (prefixcmp(buffer
, "ref:"))
803 *flag
|= REF_ISSYMREF
;
805 while (isspace(*buf
))
807 if (check_refname_format(buf
, REFNAME_ALLOW_ONELEVEL
)) {
809 *flag
|= REF_ISBROKEN
;
812 refname
= strcpy(refname_buffer
, buf
);
814 /* Please note that FETCH_HEAD has a second line containing other data. */
815 if (get_sha1_hex(buffer
, sha1
) || (buffer
[40] != '\0' && !isspace(buffer
[40]))) {
817 *flag
|= REF_ISBROKEN
;
823 char *resolve_refdup(const char *ref
, unsigned char *sha1
, int reading
, int *flag
)
825 const char *ret
= resolve_ref_unsafe(ref
, sha1
, reading
, flag
);
826 return ret
? xstrdup(ret
) : NULL
;
829 /* The argument to filter_refs */
836 int read_ref_full(const char *refname
, unsigned char *sha1
, int reading
, int *flags
)
838 if (resolve_ref_unsafe(refname
, sha1
, reading
, flags
))
843 int read_ref(const char *refname
, unsigned char *sha1
)
845 return read_ref_full(refname
, sha1
, 1, NULL
);
848 int ref_exists(const char *refname
)
850 unsigned char sha1
[20];
851 return !!resolve_ref_unsafe(refname
, sha1
, 1, NULL
);
854 static int filter_refs(const char *refname
, const unsigned char *sha1
, int flags
,
857 struct ref_filter
*filter
= (struct ref_filter
*)data
;
858 if (fnmatch(filter
->pattern
, refname
, 0))
860 return filter
->fn(refname
, sha1
, flags
, filter
->cb_data
);
863 int peel_ref(const char *refname
, unsigned char *sha1
)
866 unsigned char base
[20];
869 if (current_ref
&& (current_ref
->name
== refname
870 || !strcmp(current_ref
->name
, refname
))) {
871 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
872 hashcpy(sha1
, current_ref
->peeled
);
875 hashcpy(base
, current_ref
->sha1
);
879 if (read_ref_full(refname
, base
, 1, &flag
))
882 if ((flag
& REF_ISPACKED
)) {
883 struct ref_array
*array
= get_packed_refs(get_ref_cache(NULL
));
884 struct ref_entry
*r
= search_ref_array(array
, refname
);
886 if (r
!= NULL
&& r
->flag
& REF_KNOWS_PEELED
) {
887 hashcpy(sha1
, r
->peeled
);
893 o
= parse_object(base
);
894 if (o
&& o
->type
== OBJ_TAG
) {
895 o
= deref_tag(o
, refname
, 0);
897 hashcpy(sha1
, o
->sha1
);
904 struct warn_if_dangling_data
{
910 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
911 int flags
, void *cb_data
)
913 struct warn_if_dangling_data
*d
= cb_data
;
914 const char *resolves_to
;
915 unsigned char junk
[20];
917 if (!(flags
& REF_ISSYMREF
))
920 resolves_to
= resolve_ref_unsafe(refname
, junk
, 0, NULL
);
921 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
924 fprintf(d
->fp
, d
->msg_fmt
, refname
);
928 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
930 struct warn_if_dangling_data data
;
933 data
.refname
= refname
;
934 data
.msg_fmt
= msg_fmt
;
935 for_each_rawref(warn_if_dangling_symref
, &data
);
938 static int do_for_each_ref(const char *submodule
, const char *base
, each_ref_fn fn
,
939 int trim
, int flags
, void *cb_data
)
941 struct ref_cache
*refs
= get_ref_cache(submodule
);
942 struct ref_array
*packed_refs
= get_packed_refs(refs
);
943 struct ref_array
*loose_refs
= get_loose_refs(refs
);
944 sort_ref_array(packed_refs
);
945 sort_ref_array(loose_refs
);
946 return do_for_each_ref_in_arrays(packed_refs
,
948 base
, fn
, trim
, flags
, cb_data
);
951 static int do_head_ref(const char *submodule
, each_ref_fn fn
, void *cb_data
)
953 unsigned char sha1
[20];
957 if (resolve_gitlink_ref(submodule
, "HEAD", sha1
) == 0)
958 return fn("HEAD", sha1
, 0, cb_data
);
963 if (!read_ref_full("HEAD", sha1
, 1, &flag
))
964 return fn("HEAD", sha1
, flag
, cb_data
);
969 int head_ref(each_ref_fn fn
, void *cb_data
)
971 return do_head_ref(NULL
, fn
, cb_data
);
974 int head_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
976 return do_head_ref(submodule
, fn
, cb_data
);
979 int for_each_ref(each_ref_fn fn
, void *cb_data
)
981 return do_for_each_ref(NULL
, "", fn
, 0, 0, cb_data
);
984 int for_each_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
986 return do_for_each_ref(submodule
, "", fn
, 0, 0, cb_data
);
989 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
991 return do_for_each_ref(NULL
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
994 int for_each_ref_in_submodule(const char *submodule
, const char *prefix
,
995 each_ref_fn fn
, void *cb_data
)
997 return do_for_each_ref(submodule
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
1000 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
1002 return for_each_ref_in("refs/tags/", fn
, cb_data
);
1005 int for_each_tag_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
1007 return for_each_ref_in_submodule(submodule
, "refs/tags/", fn
, cb_data
);
1010 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
1012 return for_each_ref_in("refs/heads/", fn
, cb_data
);
1015 int for_each_branch_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
1017 return for_each_ref_in_submodule(submodule
, "refs/heads/", fn
, cb_data
);
1020 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
1022 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
1025 int for_each_remote_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
1027 return for_each_ref_in_submodule(submodule
, "refs/remotes/", fn
, cb_data
);
1030 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
1032 return do_for_each_ref(NULL
, "refs/replace/", fn
, 13, 0, cb_data
);
1035 int head_ref_namespaced(each_ref_fn fn
, void *cb_data
)
1037 struct strbuf buf
= STRBUF_INIT
;
1039 unsigned char sha1
[20];
1042 strbuf_addf(&buf
, "%sHEAD", get_git_namespace());
1043 if (!read_ref_full(buf
.buf
, sha1
, 1, &flag
))
1044 ret
= fn(buf
.buf
, sha1
, flag
, cb_data
);
1045 strbuf_release(&buf
);
1050 int for_each_namespaced_ref(each_ref_fn fn
, void *cb_data
)
1052 struct strbuf buf
= STRBUF_INIT
;
1054 strbuf_addf(&buf
, "%srefs/", get_git_namespace());
1055 ret
= do_for_each_ref(NULL
, buf
.buf
, fn
, 0, 0, cb_data
);
1056 strbuf_release(&buf
);
1060 int for_each_glob_ref_in(each_ref_fn fn
, const char *pattern
,
1061 const char *prefix
, void *cb_data
)
1063 struct strbuf real_pattern
= STRBUF_INIT
;
1064 struct ref_filter filter
;
1067 if (!prefix
&& prefixcmp(pattern
, "refs/"))
1068 strbuf_addstr(&real_pattern
, "refs/");
1070 strbuf_addstr(&real_pattern
, prefix
);
1071 strbuf_addstr(&real_pattern
, pattern
);
1073 if (!has_glob_specials(pattern
)) {
1074 /* Append implied '/' '*' if not present. */
1075 if (real_pattern
.buf
[real_pattern
.len
- 1] != '/')
1076 strbuf_addch(&real_pattern
, '/');
1077 /* No need to check for '*', there is none. */
1078 strbuf_addch(&real_pattern
, '*');
1081 filter
.pattern
= real_pattern
.buf
;
1083 filter
.cb_data
= cb_data
;
1084 ret
= for_each_ref(filter_refs
, &filter
);
1086 strbuf_release(&real_pattern
);
1090 int for_each_glob_ref(each_ref_fn fn
, const char *pattern
, void *cb_data
)
1092 return for_each_glob_ref_in(fn
, pattern
, NULL
, cb_data
);
1095 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
1097 return do_for_each_ref(NULL
, "", fn
, 0,
1098 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
1101 const char *prettify_refname(const char *name
)
1104 !prefixcmp(name
, "refs/heads/") ? 11 :
1105 !prefixcmp(name
, "refs/tags/") ? 10 :
1106 !prefixcmp(name
, "refs/remotes/") ? 13 :
1110 const char *ref_rev_parse_rules
[] = {
1115 "refs/remotes/%.*s",
1116 "refs/remotes/%.*s/HEAD",
1120 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
1123 const int abbrev_name_len
= strlen(abbrev_name
);
1125 for (p
= rules
; *p
; p
++) {
1126 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
1134 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
1135 const unsigned char *old_sha1
, int mustexist
)
1137 if (read_ref_full(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
1138 error("Can't verify ref %s", lock
->ref_name
);
1142 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
1143 error("Ref %s is at %s but expected %s", lock
->ref_name
,
1144 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
1151 static int remove_empty_directories(const char *file
)
1153 /* we want to create a file but there is a directory there;
1154 * if that is an empty directory (or a directory that contains
1155 * only empty directories), remove them.
1160 strbuf_init(&path
, 20);
1161 strbuf_addstr(&path
, file
);
1163 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
1165 strbuf_release(&path
);
1171 * *string and *len will only be substituted, and *string returned (for
1172 * later free()ing) if the string passed in is a magic short-hand form
1175 static char *substitute_branch_name(const char **string
, int *len
)
1177 struct strbuf buf
= STRBUF_INIT
;
1178 int ret
= interpret_branch_name(*string
, &buf
);
1182 *string
= strbuf_detach(&buf
, &size
);
1184 return (char *)*string
;
1190 int dwim_ref(const char *str
, int len
, unsigned char *sha1
, char **ref
)
1192 char *last_branch
= substitute_branch_name(&str
, &len
);
1197 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1198 char fullref
[PATH_MAX
];
1199 unsigned char sha1_from_ref
[20];
1200 unsigned char *this_result
;
1203 this_result
= refs_found
? sha1_from_ref
: sha1
;
1204 mksnpath(fullref
, sizeof(fullref
), *p
, len
, str
);
1205 r
= resolve_ref_unsafe(fullref
, this_result
, 1, &flag
);
1209 if (!warn_ambiguous_refs
)
1211 } else if ((flag
& REF_ISSYMREF
) && strcmp(fullref
, "HEAD")) {
1212 warning("ignoring dangling symref %s.", fullref
);
1213 } else if ((flag
& REF_ISBROKEN
) && strchr(fullref
, '/')) {
1214 warning("ignoring broken ref %s.", fullref
);
1221 int dwim_log(const char *str
, int len
, unsigned char *sha1
, char **log
)
1223 char *last_branch
= substitute_branch_name(&str
, &len
);
1228 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1230 unsigned char hash
[20];
1231 char path
[PATH_MAX
];
1232 const char *ref
, *it
;
1234 mksnpath(path
, sizeof(path
), *p
, len
, str
);
1235 ref
= resolve_ref_unsafe(path
, hash
, 1, NULL
);
1238 if (!stat(git_path("logs/%s", path
), &st
) &&
1239 S_ISREG(st
.st_mode
))
1241 else if (strcmp(ref
, path
) &&
1242 !stat(git_path("logs/%s", ref
), &st
) &&
1243 S_ISREG(st
.st_mode
))
1247 if (!logs_found
++) {
1249 hashcpy(sha1
, hash
);
1251 if (!warn_ambiguous_refs
)
1258 static struct ref_lock
*lock_ref_sha1_basic(const char *refname
,
1259 const unsigned char *old_sha1
,
1260 int flags
, int *type_p
)
1263 const char *orig_refname
= refname
;
1264 struct ref_lock
*lock
;
1267 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1270 lock
= xcalloc(1, sizeof(struct ref_lock
));
1273 refname
= resolve_ref_unsafe(refname
, lock
->old_sha1
, mustexist
, &type
);
1274 if (!refname
&& errno
== EISDIR
) {
1275 /* we are trying to lock foo but we used to
1276 * have foo/bar which now does not exist;
1277 * it is normal for the empty directory 'foo'
1280 ref_file
= git_path("%s", orig_refname
);
1281 if (remove_empty_directories(ref_file
)) {
1283 error("there are still refs under '%s'", orig_refname
);
1286 refname
= resolve_ref_unsafe(orig_refname
, lock
->old_sha1
, mustexist
, &type
);
1292 error("unable to resolve reference %s: %s",
1293 orig_refname
, strerror(errno
));
1296 missing
= is_null_sha1(lock
->old_sha1
);
1297 /* When the ref did not exist and we are creating it,
1298 * make sure there is no existing ref that is packed
1299 * whose name begins with our refname, nor a ref whose
1300 * name is a proper prefix of our refname.
1303 !is_refname_available(refname
, NULL
, get_packed_refs(get_ref_cache(NULL
)))) {
1304 last_errno
= ENOTDIR
;
1308 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1310 lflags
= LOCK_DIE_ON_ERROR
;
1311 if (flags
& REF_NODEREF
) {
1312 refname
= orig_refname
;
1313 lflags
|= LOCK_NODEREF
;
1315 lock
->ref_name
= xstrdup(refname
);
1316 lock
->orig_ref_name
= xstrdup(orig_refname
);
1317 ref_file
= git_path("%s", refname
);
1319 lock
->force_write
= 1;
1320 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
1321 lock
->force_write
= 1;
1323 if (safe_create_leading_directories(ref_file
)) {
1325 error("unable to create directory for %s", ref_file
);
1329 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
1330 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
1338 struct ref_lock
*lock_ref_sha1(const char *refname
, const unsigned char *old_sha1
)
1340 char refpath
[PATH_MAX
];
1341 if (check_refname_format(refname
, 0))
1343 strcpy(refpath
, mkpath("refs/%s", refname
));
1344 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
1347 struct ref_lock
*lock_any_ref_for_update(const char *refname
,
1348 const unsigned char *old_sha1
, int flags
)
1350 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
1352 return lock_ref_sha1_basic(refname
, old_sha1
, flags
, NULL
);
1355 struct repack_without_ref_sb
{
1356 const char *refname
;
1360 static int repack_without_ref_fn(const char *refname
, const unsigned char *sha1
,
1361 int flags
, void *cb_data
)
1363 struct repack_without_ref_sb
*data
= cb_data
;
1364 char line
[PATH_MAX
+ 100];
1367 if (!strcmp(data
->refname
, refname
))
1369 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1370 sha1_to_hex(sha1
), refname
);
1371 /* this should not happen but just being defensive */
1372 if (len
> sizeof(line
))
1373 die("too long a refname '%s'", refname
);
1374 write_or_die(data
->fd
, line
, len
);
1378 static struct lock_file packlock
;
1380 static int repack_without_ref(const char *refname
)
1382 struct repack_without_ref_sb data
;
1383 struct ref_array
*packed
= get_packed_refs(get_ref_cache(NULL
));
1384 sort_ref_array(packed
);
1385 if (search_ref_array(packed
, refname
) == NULL
)
1387 data
.refname
= refname
;
1388 data
.fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
1390 unable_to_lock_error(git_path("packed-refs"), errno
);
1391 return error("cannot delete '%s' from packed refs", refname
);
1393 do_for_each_ref_in_array(packed
, 0, "", repack_without_ref_fn
, 0, 0, &data
);
1394 return commit_lock_file(&packlock
);
1397 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1399 struct ref_lock
*lock
;
1400 int err
, i
= 0, ret
= 0, flag
= 0;
1402 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1405 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1409 if (!(delopt
& REF_NODEREF
)) {
1410 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1411 lock
->lk
->filename
[i
] = 0;
1412 path
= lock
->lk
->filename
;
1414 path
= git_path("%s", refname
);
1416 err
= unlink_or_warn(path
);
1417 if (err
&& errno
!= ENOENT
)
1420 if (!(delopt
& REF_NODEREF
))
1421 lock
->lk
->filename
[i
] = '.';
1423 /* removing the loose one could have resurrected an earlier
1424 * packed one. Also, if it was not loose we need to repack
1427 ret
|= repack_without_ref(refname
);
1429 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1430 invalidate_ref_cache(NULL
);
1436 * People using contrib's git-new-workdir have .git/logs/refs ->
1437 * /some/other/path/.git/logs/refs, and that may live on another device.
1439 * IOW, to avoid cross device rename errors, the temporary renamed log must
1440 * live into logs/refs.
1442 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1444 int rename_ref(const char *oldrefname
, const char *newrefname
, const char *logmsg
)
1446 unsigned char sha1
[20], orig_sha1
[20];
1447 int flag
= 0, logmoved
= 0;
1448 struct ref_lock
*lock
;
1449 struct stat loginfo
;
1450 int log
= !lstat(git_path("logs/%s", oldrefname
), &loginfo
);
1451 const char *symref
= NULL
;
1452 struct ref_cache
*refs
= get_ref_cache(NULL
);
1454 if (log
&& S_ISLNK(loginfo
.st_mode
))
1455 return error("reflog for %s is a symlink", oldrefname
);
1457 symref
= resolve_ref_unsafe(oldrefname
, orig_sha1
, 1, &flag
);
1458 if (flag
& REF_ISSYMREF
)
1459 return error("refname %s is a symbolic ref, renaming it is not supported",
1462 return error("refname %s not found", oldrefname
);
1464 if (!is_refname_available(newrefname
, oldrefname
, get_packed_refs(refs
)))
1467 if (!is_refname_available(newrefname
, oldrefname
, get_loose_refs(refs
)))
1470 if (log
&& rename(git_path("logs/%s", oldrefname
), git_path(TMP_RENAMED_LOG
)))
1471 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG
": %s",
1472 oldrefname
, strerror(errno
));
1474 if (delete_ref(oldrefname
, orig_sha1
, REF_NODEREF
)) {
1475 error("unable to delete old %s", oldrefname
);
1479 if (!read_ref_full(newrefname
, sha1
, 1, &flag
) &&
1480 delete_ref(newrefname
, sha1
, REF_NODEREF
)) {
1481 if (errno
==EISDIR
) {
1482 if (remove_empty_directories(git_path("%s", newrefname
))) {
1483 error("Directory not empty: %s", newrefname
);
1487 error("unable to delete existing %s", newrefname
);
1492 if (log
&& safe_create_leading_directories(git_path("logs/%s", newrefname
))) {
1493 error("unable to create directory for %s", newrefname
);
1498 if (log
&& rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", newrefname
))) {
1499 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1501 * rename(a, b) when b is an existing
1502 * directory ought to result in ISDIR, but
1503 * Solaris 5.8 gives ENOTDIR. Sheesh.
1505 if (remove_empty_directories(git_path("logs/%s", newrefname
))) {
1506 error("Directory not empty: logs/%s", newrefname
);
1511 error("unable to move logfile "TMP_RENAMED_LOG
" to logs/%s: %s",
1512 newrefname
, strerror(errno
));
1518 lock
= lock_ref_sha1_basic(newrefname
, NULL
, 0, NULL
);
1520 error("unable to lock %s for update", newrefname
);
1523 lock
->force_write
= 1;
1524 hashcpy(lock
->old_sha1
, orig_sha1
);
1525 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1526 error("unable to write current sha1 into %s", newrefname
);
1533 lock
= lock_ref_sha1_basic(oldrefname
, NULL
, 0, NULL
);
1535 error("unable to lock %s for rollback", oldrefname
);
1539 lock
->force_write
= 1;
1540 flag
= log_all_ref_updates
;
1541 log_all_ref_updates
= 0;
1542 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1543 error("unable to write current sha1 into %s", oldrefname
);
1544 log_all_ref_updates
= flag
;
1547 if (logmoved
&& rename(git_path("logs/%s", newrefname
), git_path("logs/%s", oldrefname
)))
1548 error("unable to restore logfile %s from %s: %s",
1549 oldrefname
, newrefname
, strerror(errno
));
1550 if (!logmoved
&& log
&&
1551 rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", oldrefname
)))
1552 error("unable to restore logfile %s from "TMP_RENAMED_LOG
": %s",
1553 oldrefname
, strerror(errno
));
1558 int close_ref(struct ref_lock
*lock
)
1560 if (close_lock_file(lock
->lk
))
1566 int commit_ref(struct ref_lock
*lock
)
1568 if (commit_lock_file(lock
->lk
))
1574 void unlock_ref(struct ref_lock
*lock
)
1576 /* Do not free lock->lk -- atexit() still looks at them */
1578 rollback_lock_file(lock
->lk
);
1579 free(lock
->ref_name
);
1580 free(lock
->orig_ref_name
);
1585 * copy the reflog message msg to buf, which has been allocated sufficiently
1586 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1587 * because reflog file is one line per entry.
1589 static int copy_msg(char *buf
, const char *msg
)
1596 while ((c
= *msg
++)) {
1597 if (wasspace
&& isspace(c
))
1599 wasspace
= isspace(c
);
1604 while (buf
< cp
&& isspace(cp
[-1]))
1610 int log_ref_setup(const char *refname
, char *logfile
, int bufsize
)
1612 int logfd
, oflags
= O_APPEND
| O_WRONLY
;
1614 git_snpath(logfile
, bufsize
, "logs/%s", refname
);
1615 if (log_all_ref_updates
&&
1616 (!prefixcmp(refname
, "refs/heads/") ||
1617 !prefixcmp(refname
, "refs/remotes/") ||
1618 !prefixcmp(refname
, "refs/notes/") ||
1619 !strcmp(refname
, "HEAD"))) {
1620 if (safe_create_leading_directories(logfile
) < 0)
1621 return error("unable to create directory for %s",
1626 logfd
= open(logfile
, oflags
, 0666);
1628 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1631 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1632 if (remove_empty_directories(logfile
)) {
1633 return error("There are still logs under '%s'",
1636 logfd
= open(logfile
, oflags
, 0666);
1640 return error("Unable to append to %s: %s",
1641 logfile
, strerror(errno
));
1644 adjust_shared_perm(logfile
);
1649 static int log_ref_write(const char *refname
, const unsigned char *old_sha1
,
1650 const unsigned char *new_sha1
, const char *msg
)
1652 int logfd
, result
, written
, oflags
= O_APPEND
| O_WRONLY
;
1653 unsigned maxlen
, len
;
1655 char log_file
[PATH_MAX
];
1657 const char *committer
;
1659 if (log_all_ref_updates
< 0)
1660 log_all_ref_updates
= !is_bare_repository();
1662 result
= log_ref_setup(refname
, log_file
, sizeof(log_file
));
1666 logfd
= open(log_file
, oflags
);
1669 msglen
= msg
? strlen(msg
) : 0;
1670 committer
= git_committer_info(0);
1671 maxlen
= strlen(committer
) + msglen
+ 100;
1672 logrec
= xmalloc(maxlen
);
1673 len
= sprintf(logrec
, "%s %s %s\n",
1674 sha1_to_hex(old_sha1
),
1675 sha1_to_hex(new_sha1
),
1678 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1679 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1681 if (close(logfd
) != 0 || written
!= len
)
1682 return error("Unable to append to %s", log_file
);
1686 static int is_branch(const char *refname
)
1688 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1691 int write_ref_sha1(struct ref_lock
*lock
,
1692 const unsigned char *sha1
, const char *logmsg
)
1694 static char term
= '\n';
1699 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1703 o
= parse_object(sha1
);
1705 error("Trying to write ref %s with nonexistent object %s",
1706 lock
->ref_name
, sha1_to_hex(sha1
));
1710 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1711 error("Trying to write non-commit object %s to branch %s",
1712 sha1_to_hex(sha1
), lock
->ref_name
);
1716 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1717 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1718 || close_ref(lock
) < 0) {
1719 error("Couldn't write %s", lock
->lk
->filename
);
1723 clear_loose_ref_cache(get_ref_cache(NULL
));
1724 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1725 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1726 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1730 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1732 * Special hack: If a branch is updated directly and HEAD
1733 * points to it (may happen on the remote side of a push
1734 * for example) then logically the HEAD reflog should be
1736 * A generic solution implies reverse symref information,
1737 * but finding all symrefs pointing to the given branch
1738 * would be rather costly for this rare event (the direct
1739 * update of a branch) to be worth it. So let's cheat and
1740 * check with HEAD only which should cover 99% of all usage
1741 * scenarios (even 100% of the default ones).
1743 unsigned char head_sha1
[20];
1745 const char *head_ref
;
1746 head_ref
= resolve_ref_unsafe("HEAD", head_sha1
, 1, &head_flag
);
1747 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1748 !strcmp(head_ref
, lock
->ref_name
))
1749 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1751 if (commit_ref(lock
)) {
1752 error("Couldn't set %s", lock
->ref_name
);
1760 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1763 const char *lockpath
;
1765 int fd
, len
, written
;
1766 char *git_HEAD
= git_pathdup("%s", ref_target
);
1767 unsigned char old_sha1
[20], new_sha1
[20];
1769 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1772 if (safe_create_leading_directories(git_HEAD
) < 0)
1773 return error("unable to create directory for %s", git_HEAD
);
1775 #ifndef NO_SYMLINK_HEAD
1776 if (prefer_symlink_refs
) {
1778 if (!symlink(refs_heads_master
, git_HEAD
))
1780 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1784 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1785 if (sizeof(ref
) <= len
) {
1786 error("refname too long: %s", refs_heads_master
);
1787 goto error_free_return
;
1789 lockpath
= mkpath("%s.lock", git_HEAD
);
1790 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1792 error("Unable to open %s for writing", lockpath
);
1793 goto error_free_return
;
1795 written
= write_in_full(fd
, ref
, len
);
1796 if (close(fd
) != 0 || written
!= len
) {
1797 error("Unable to write to %s", lockpath
);
1798 goto error_unlink_return
;
1800 if (rename(lockpath
, git_HEAD
) < 0) {
1801 error("Unable to create %s", git_HEAD
);
1802 goto error_unlink_return
;
1804 if (adjust_shared_perm(git_HEAD
)) {
1805 error("Unable to fix permissions on %s", lockpath
);
1806 error_unlink_return
:
1807 unlink_or_warn(lockpath
);
1813 #ifndef NO_SYMLINK_HEAD
1816 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1817 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1823 static char *ref_msg(const char *line
, const char *endp
)
1827 ep
= memchr(line
, '\n', endp
- line
);
1830 return xmemdupz(line
, ep
- line
);
1833 int read_ref_at(const char *refname
, unsigned long at_time
, int cnt
,
1834 unsigned char *sha1
, char **msg
,
1835 unsigned long *cutoff_time
, int *cutoff_tz
, int *cutoff_cnt
)
1837 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1839 int logfd
, tz
, reccnt
= 0;
1842 unsigned char logged_sha1
[20];
1846 logfile
= git_path("logs/%s", refname
);
1847 logfd
= open(logfile
, O_RDONLY
, 0);
1849 die_errno("Unable to read log '%s'", logfile
);
1852 die("Log %s is empty.", logfile
);
1853 mapsz
= xsize_t(st
.st_size
);
1854 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1855 logdata
= log_mapped
;
1859 rec
= logend
= logdata
+ st
.st_size
;
1860 while (logdata
< rec
) {
1862 if (logdata
< rec
&& *(rec
-1) == '\n')
1865 while (logdata
< rec
&& *(rec
-1) != '\n') {
1871 die("Log %s is corrupt.", logfile
);
1872 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1873 if (date
<= at_time
|| cnt
== 0) {
1874 tz
= strtoul(tz_c
, NULL
, 10);
1876 *msg
= ref_msg(rec
, logend
);
1878 *cutoff_time
= date
;
1882 *cutoff_cnt
= reccnt
- 1;
1884 if (get_sha1_hex(lastrec
, logged_sha1
))
1885 die("Log %s is corrupt.", logfile
);
1886 if (get_sha1_hex(rec
+ 41, sha1
))
1887 die("Log %s is corrupt.", logfile
);
1888 if (hashcmp(logged_sha1
, sha1
)) {
1889 warning("Log %s has gap after %s.",
1890 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1893 else if (date
== at_time
) {
1894 if (get_sha1_hex(rec
+ 41, sha1
))
1895 die("Log %s is corrupt.", logfile
);
1898 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1899 die("Log %s is corrupt.", logfile
);
1900 if (hashcmp(logged_sha1
, sha1
)) {
1901 warning("Log %s unexpectedly ended on %s.",
1902 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1905 munmap(log_mapped
, mapsz
);
1914 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1916 if (rec
== logend
|| *rec
== '\n')
1917 die("Log %s is corrupt.", logfile
);
1918 date
= strtoul(rec
+ 1, &tz_c
, 10);
1919 tz
= strtoul(tz_c
, NULL
, 10);
1920 if (get_sha1_hex(logdata
, sha1
))
1921 die("Log %s is corrupt.", logfile
);
1922 if (is_null_sha1(sha1
)) {
1923 if (get_sha1_hex(logdata
+ 41, sha1
))
1924 die("Log %s is corrupt.", logfile
);
1927 *msg
= ref_msg(logdata
, logend
);
1928 munmap(log_mapped
, mapsz
);
1931 *cutoff_time
= date
;
1935 *cutoff_cnt
= reccnt
;
1939 int for_each_recent_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1941 const char *logfile
;
1943 struct strbuf sb
= STRBUF_INIT
;
1946 logfile
= git_path("logs/%s", refname
);
1947 logfp
= fopen(logfile
, "r");
1952 struct stat statbuf
;
1953 if (fstat(fileno(logfp
), &statbuf
) ||
1954 statbuf
.st_size
< ofs
||
1955 fseek(logfp
, -ofs
, SEEK_END
) ||
1956 strbuf_getwholeline(&sb
, logfp
, '\n')) {
1958 strbuf_release(&sb
);
1963 while (!strbuf_getwholeline(&sb
, logfp
, '\n')) {
1964 unsigned char osha1
[20], nsha1
[20];
1965 char *email_end
, *message
;
1966 unsigned long timestamp
;
1969 /* old SP new SP name <email> SP time TAB msg LF */
1970 if (sb
.len
< 83 || sb
.buf
[sb
.len
- 1] != '\n' ||
1971 get_sha1_hex(sb
.buf
, osha1
) || sb
.buf
[40] != ' ' ||
1972 get_sha1_hex(sb
.buf
+ 41, nsha1
) || sb
.buf
[81] != ' ' ||
1973 !(email_end
= strchr(sb
.buf
+ 82, '>')) ||
1974 email_end
[1] != ' ' ||
1975 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1976 !message
|| message
[0] != ' ' ||
1977 (message
[1] != '+' && message
[1] != '-') ||
1978 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1979 !isdigit(message
[4]) || !isdigit(message
[5]))
1980 continue; /* corrupt? */
1981 email_end
[1] = '\0';
1982 tz
= strtol(message
+ 1, NULL
, 10);
1983 if (message
[6] != '\t')
1987 ret
= fn(osha1
, nsha1
, sb
.buf
+ 82, timestamp
, tz
, message
,
1993 strbuf_release(&sb
);
1997 int for_each_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, void *cb_data
)
1999 return for_each_recent_reflog_ent(refname
, fn
, 0, cb_data
);
2002 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
2004 DIR *dir
= opendir(git_path("logs/%s", base
));
2009 int baselen
= strlen(base
);
2010 char *log
= xmalloc(baselen
+ 257);
2012 memcpy(log
, base
, baselen
);
2013 if (baselen
&& base
[baselen
-1] != '/')
2014 log
[baselen
++] = '/';
2016 while ((de
= readdir(dir
)) != NULL
) {
2020 if (de
->d_name
[0] == '.')
2022 namelen
= strlen(de
->d_name
);
2025 if (has_extension(de
->d_name
, ".lock"))
2027 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
2028 if (stat(git_path("logs/%s", log
), &st
) < 0)
2030 if (S_ISDIR(st
.st_mode
)) {
2031 retval
= do_for_each_reflog(log
, fn
, cb_data
);
2033 unsigned char sha1
[20];
2034 if (read_ref_full(log
, sha1
, 0, NULL
))
2035 retval
= error("bad ref for %s", log
);
2037 retval
= fn(log
, sha1
, 0, cb_data
);
2050 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
2052 return do_for_each_reflog("", fn
, cb_data
);
2055 int update_ref(const char *action
, const char *refname
,
2056 const unsigned char *sha1
, const unsigned char *oldval
,
2057 int flags
, enum action_on_err onerr
)
2059 static struct ref_lock
*lock
;
2060 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
2062 const char *str
= "Cannot lock the ref '%s'.";
2064 case MSG_ON_ERR
: error(str
, refname
); break;
2065 case DIE_ON_ERR
: die(str
, refname
); break;
2066 case QUIET_ON_ERR
: break;
2070 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
2071 const char *str
= "Cannot update the ref '%s'.";
2073 case MSG_ON_ERR
: error(str
, refname
); break;
2074 case DIE_ON_ERR
: die(str
, refname
); break;
2075 case QUIET_ON_ERR
: break;
2082 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
2084 for ( ; list
; list
= list
->next
)
2085 if (!strcmp(list
->name
, name
))
2086 return (struct ref
*)list
;
2091 * generate a format suitable for scanf from a ref_rev_parse_rules
2092 * rule, that is replace the "%.*s" spec with a "%s" spec
2094 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
2098 spec
= strstr(rule
, "%.*s");
2099 if (!spec
|| strstr(spec
+ 4, "%.*s"))
2100 die("invalid rule in ref_rev_parse_rules: %s", rule
);
2102 /* copy all until spec */
2103 strncpy(scanf_fmt
, rule
, spec
- rule
);
2104 scanf_fmt
[spec
- rule
] = '\0';
2106 strcat(scanf_fmt
, "%s");
2107 /* copy remaining rule */
2108 strcat(scanf_fmt
, spec
+ 4);
2113 char *shorten_unambiguous_ref(const char *refname
, int strict
)
2116 static char **scanf_fmts
;
2117 static int nr_rules
;
2120 /* pre generate scanf formats from ref_rev_parse_rules[] */
2122 size_t total_len
= 0;
2124 /* the rule list is NULL terminated, count them first */
2125 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
2126 /* no +1 because strlen("%s") < strlen("%.*s") */
2127 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
2129 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
2132 for (i
= 0; i
< nr_rules
; i
++) {
2133 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
2135 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
2136 total_len
+= strlen(ref_rev_parse_rules
[i
]);
2140 /* bail out if there are no rules */
2142 return xstrdup(refname
);
2144 /* buffer for scanf result, at most refname must fit */
2145 short_name
= xstrdup(refname
);
2147 /* skip first rule, it will always match */
2148 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
2150 int rules_to_fail
= i
;
2153 if (1 != sscanf(refname
, scanf_fmts
[i
], short_name
))
2156 short_name_len
= strlen(short_name
);
2159 * in strict mode, all (except the matched one) rules
2160 * must fail to resolve to a valid non-ambiguous ref
2163 rules_to_fail
= nr_rules
;
2166 * check if the short name resolves to a valid ref,
2167 * but use only rules prior to the matched one
2169 for (j
= 0; j
< rules_to_fail
; j
++) {
2170 const char *rule
= ref_rev_parse_rules
[j
];
2171 char refname
[PATH_MAX
];
2173 /* skip matched rule */
2178 * the short name is ambiguous, if it resolves
2179 * (with this previous rule) to a valid ref
2180 * read_ref() returns 0 on success
2182 mksnpath(refname
, sizeof(refname
),
2183 rule
, short_name_len
, short_name
);
2184 if (ref_exists(refname
))
2189 * short name is non-ambiguous if all previous rules
2190 * haven't resolved to a valid ref
2192 if (j
== rules_to_fail
)
2197 return xstrdup(refname
);