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 static void free_ref_entry(struct ref_entry
*entry
)
153 /* Add a ref_entry to the end of the ref_array (unsorted). */
154 static void add_ref(struct ref_array
*refs
, struct ref_entry
*ref
)
156 ALLOC_GROW(refs
->refs
, refs
->nr
+ 1, refs
->alloc
);
157 refs
->refs
[refs
->nr
++] = ref
;
160 static void clear_ref_array(struct ref_array
*array
)
163 for (i
= 0; i
< array
->nr
; i
++)
164 free_ref_entry(array
->refs
[i
]);
166 array
->sorted
= array
->nr
= array
->alloc
= 0;
170 static int ref_entry_cmp(const void *a
, const void *b
)
172 struct ref_entry
*one
= *(struct ref_entry
**)a
;
173 struct ref_entry
*two
= *(struct ref_entry
**)b
;
174 return strcmp(one
->name
, two
->name
);
177 static void sort_ref_array(struct ref_array
*array
);
179 static struct ref_entry
*search_ref_array(struct ref_array
*array
, const char *refname
)
181 struct ref_entry
*e
, **r
;
189 sort_ref_array(array
);
190 len
= strlen(refname
) + 1;
191 e
= xmalloc(sizeof(struct ref_entry
) + len
);
192 memcpy(e
->name
, refname
, len
);
194 r
= bsearch(&e
, array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
205 * Emit a warning and return true iff ref1 and ref2 have the same name
206 * and the same sha1. Die if they have the same name but different
209 static int is_dup_ref(const struct ref_entry
*ref1
, const struct ref_entry
*ref2
)
211 if (!strcmp(ref1
->name
, ref2
->name
)) {
212 /* Duplicate name; make sure that the SHA1s match: */
213 if (hashcmp(ref1
->sha1
, ref2
->sha1
))
214 die("Duplicated ref, and SHA1s don't match: %s",
216 warning("Duplicated ref: %s", ref1
->name
);
224 * Sort the entries in array (if they are not already sorted).
226 static void sort_ref_array(struct ref_array
*array
)
231 * This check also prevents passing a zero-length array to qsort(),
232 * which is a problem on some platforms.
234 if (array
->sorted
== array
->nr
)
237 qsort(array
->refs
, array
->nr
, sizeof(*array
->refs
), ref_entry_cmp
);
239 /* Remove any duplicates from the ref_array */
241 for (j
= 1; j
< array
->nr
; j
++) {
242 if (is_dup_ref(array
->refs
[i
], array
->refs
[j
])) {
243 free_ref_entry(array
->refs
[j
]);
246 array
->refs
[++i
] = array
->refs
[j
];
248 array
->sorted
= array
->nr
= i
+ 1;
251 #define DO_FOR_EACH_INCLUDE_BROKEN 01
253 static struct ref_entry
*current_ref
;
255 static int do_one_ref(const char *base
, each_ref_fn fn
, int trim
,
256 int flags
, void *cb_data
, struct ref_entry
*entry
)
259 if (prefixcmp(entry
->name
, base
))
262 if (!(flags
& DO_FOR_EACH_INCLUDE_BROKEN
)) {
263 if (entry
->flag
& REF_ISBROKEN
)
264 return 0; /* ignore broken refs e.g. dangling symref */
265 if (!has_sha1_file(entry
->sha1
)) {
266 error("%s does not point to a valid object!", entry
->name
);
271 retval
= fn(entry
->name
+ trim
, entry
->sha1
, entry
->flag
, cb_data
);
277 * Call fn for each reference in array that has index in the range
278 * offset <= index < array->nr. This function does not sort the
279 * array; sorting should be done by the caller.
281 static int do_for_each_ref_in_array(struct ref_array
*array
, int offset
,
283 each_ref_fn fn
, int trim
, int flags
, void *cb_data
)
286 assert(array
->sorted
== array
->nr
);
287 for (i
= offset
; i
< array
->nr
; i
++) {
288 int retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, array
->refs
[i
]);
296 * Call fn for each reference in the union of array1 and array2, in
297 * order by refname. If an entry appears in both array1 and array2,
298 * then only process the version that is in array2. The input arrays
299 * must already be sorted.
301 static int do_for_each_ref_in_arrays(struct ref_array
*array1
,
302 struct ref_array
*array2
,
303 const char *base
, each_ref_fn fn
, int trim
,
304 int flags
, void *cb_data
)
309 assert(array1
->sorted
== array1
->nr
);
310 assert(array2
->sorted
== array2
->nr
);
311 while (i1
< array1
->nr
&& i2
< array2
->nr
) {
312 struct ref_entry
*e1
= array1
->refs
[i1
];
313 struct ref_entry
*e2
= array2
->refs
[i2
];
314 int cmp
= strcmp(e1
->name
, e2
->name
);
316 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, e1
);
319 retval
= do_one_ref(base
, fn
, trim
, flags
, cb_data
, e2
);
323 * There was a ref in array1 with the
324 * same name; ignore it.
333 return do_for_each_ref_in_array(array1
, i1
,
334 base
, fn
, trim
, flags
, cb_data
);
336 return do_for_each_ref_in_array(array2
, i2
,
337 base
, fn
, trim
, flags
, cb_data
);
342 * Return true iff refname1 and refname2 conflict with each other.
343 * Two reference names conflict if one of them exactly matches the
344 * leading components of the other; e.g., "foo/bar" conflicts with
345 * both "foo" and with "foo/bar/baz" but not with "foo/bar" or
348 static int names_conflict(const char *refname1
, const char *refname2
)
350 for (; *refname1
&& *refname1
== *refname2
; refname1
++, refname2
++)
352 return (*refname1
== '\0' && *refname2
== '/')
353 || (*refname1
== '/' && *refname2
== '\0');
356 struct name_conflict_cb
{
358 const char *oldrefname
;
359 const char *conflicting_refname
;
362 static int name_conflict_fn(const char *existingrefname
, const unsigned char *sha1
,
363 int flags
, void *cb_data
)
365 struct name_conflict_cb
*data
= (struct name_conflict_cb
*)cb_data
;
366 if (data
->oldrefname
&& !strcmp(data
->oldrefname
, existingrefname
))
368 if (names_conflict(data
->refname
, existingrefname
)) {
369 data
->conflicting_refname
= existingrefname
;
376 * Return true iff a reference named refname could be created without
377 * conflicting with the name of an existing reference in array. If
378 * oldrefname is non-NULL, ignore potential conflicts with oldrefname
379 * (e.g., because oldrefname is scheduled for deletion in the same
382 static int is_refname_available(const char *refname
, const char *oldrefname
,
383 struct ref_array
*array
)
385 struct name_conflict_cb data
;
386 data
.refname
= refname
;
387 data
.oldrefname
= oldrefname
;
388 data
.conflicting_refname
= NULL
;
390 sort_ref_array(array
);
391 if (do_for_each_ref_in_array(array
, 0, "", name_conflict_fn
,
392 0, DO_FOR_EACH_INCLUDE_BROKEN
,
394 error("'%s' exists; cannot create '%s'",
395 data
.conflicting_refname
, refname
);
402 * Future: need to be in "struct repository"
403 * when doing a full libification.
405 static struct ref_cache
{
406 struct ref_cache
*next
;
409 struct ref_array loose
;
410 struct ref_array packed
;
411 /* The submodule name, or "" for the main repo. */
412 char name
[FLEX_ARRAY
];
415 static void clear_packed_ref_cache(struct ref_cache
*refs
)
417 if (refs
->did_packed
)
418 clear_ref_array(&refs
->packed
);
419 refs
->did_packed
= 0;
422 static void clear_loose_ref_cache(struct ref_cache
*refs
)
425 clear_ref_array(&refs
->loose
);
429 static struct ref_cache
*create_ref_cache(const char *submodule
)
432 struct ref_cache
*refs
;
435 len
= strlen(submodule
) + 1;
436 refs
= xcalloc(1, sizeof(struct ref_cache
) + len
);
437 memcpy(refs
->name
, submodule
, len
);
442 * Return a pointer to a ref_cache for the specified submodule. For
443 * the main repository, use submodule==NULL. The returned structure
444 * will be allocated and initialized but not necessarily populated; it
445 * should not be freed.
447 static struct ref_cache
*get_ref_cache(const char *submodule
)
449 struct ref_cache
*refs
= ref_cache
;
453 if (!strcmp(submodule
, refs
->name
))
458 refs
= create_ref_cache(submodule
);
459 refs
->next
= ref_cache
;
464 void invalidate_ref_cache(const char *submodule
)
466 struct ref_cache
*refs
= get_ref_cache(submodule
);
467 clear_packed_ref_cache(refs
);
468 clear_loose_ref_cache(refs
);
472 * Parse one line from a packed-refs file. Write the SHA1 to sha1.
473 * Return a pointer to the refname within the line (null-terminated),
474 * or NULL if there was a problem.
476 static const char *parse_ref_line(char *line
, unsigned char *sha1
)
479 * 42: the answer to everything.
481 * In this case, it happens to be the answer to
482 * 40 (length of sha1 hex representation)
483 * +1 (space in between hex and name)
484 * +1 (newline at the end of the line)
486 int len
= strlen(line
) - 42;
490 if (get_sha1_hex(line
, sha1
) < 0)
492 if (!isspace(line
[40]))
497 if (line
[len
] != '\n')
504 static void read_packed_refs(FILE *f
, struct ref_array
*array
)
506 struct ref_entry
*last
= NULL
;
507 char refline
[PATH_MAX
];
508 int flag
= REF_ISPACKED
;
510 while (fgets(refline
, sizeof(refline
), f
)) {
511 unsigned char sha1
[20];
513 static const char header
[] = "# pack-refs with:";
515 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
516 const char *traits
= refline
+ sizeof(header
) - 1;
517 if (strstr(traits
, " peeled "))
518 flag
|= REF_KNOWS_PEELED
;
519 /* perhaps other traits later as well */
523 refname
= parse_ref_line(refline
, sha1
);
525 last
= create_ref_entry(refname
, sha1
, flag
, 1);
526 add_ref(array
, last
);
531 strlen(refline
) == 42 &&
532 refline
[41] == '\n' &&
533 !get_sha1_hex(refline
+ 1, sha1
))
534 hashcpy(last
->peeled
, sha1
);
538 static struct ref_array
*get_packed_refs(struct ref_cache
*refs
)
540 if (!refs
->did_packed
) {
541 const char *packed_refs_file
;
545 packed_refs_file
= git_path_submodule(refs
->name
, "packed-refs");
547 packed_refs_file
= git_path("packed-refs");
548 f
= fopen(packed_refs_file
, "r");
550 read_packed_refs(f
, &refs
->packed
);
553 refs
->did_packed
= 1;
555 return &refs
->packed
;
558 void add_packed_ref(const char *refname
, const unsigned char *sha1
)
560 add_ref(get_packed_refs(get_ref_cache(NULL
)),
561 create_ref_entry(refname
, sha1
, REF_ISPACKED
, 1));
564 static void get_ref_dir(struct ref_cache
*refs
, const char *base
,
565 struct ref_array
*array
)
571 path
= git_path_submodule(refs
->name
, "%s", base
);
573 path
= git_path("%s", base
);
579 int baselen
= strlen(base
);
580 char *refname
= xmalloc(baselen
+ 257);
582 memcpy(refname
, base
, baselen
);
583 if (baselen
&& base
[baselen
-1] != '/')
584 refname
[baselen
++] = '/';
586 while ((de
= readdir(dir
)) != NULL
) {
587 unsigned char sha1
[20];
593 if (de
->d_name
[0] == '.')
595 namelen
= strlen(de
->d_name
);
598 if (has_extension(de
->d_name
, ".lock"))
600 memcpy(refname
+ baselen
, de
->d_name
, namelen
+1);
602 ? git_path_submodule(refs
->name
, "%s", refname
)
603 : git_path("%s", refname
);
604 if (stat(refdir
, &st
) < 0)
606 if (S_ISDIR(st
.st_mode
)) {
607 get_ref_dir(refs
, refname
, array
);
613 if (resolve_gitlink_ref(refs
->name
, refname
, sha1
) < 0) {
615 flag
|= REF_ISBROKEN
;
617 } else if (read_ref_full(refname
, sha1
, 1, &flag
)) {
619 flag
|= REF_ISBROKEN
;
621 add_ref(array
, create_ref_entry(refname
, sha1
, flag
, 1));
628 static struct ref_array
*get_loose_refs(struct ref_cache
*refs
)
630 if (!refs
->did_loose
) {
631 get_ref_dir(refs
, "refs", &refs
->loose
);
637 /* We allow "recursive" symbolic refs. Only within reason, though */
639 #define MAXREFLEN (1024)
642 * Called by resolve_gitlink_ref_recursive() after it failed to read
643 * from the loose refs in ref_cache refs. Find <refname> in the
644 * packed-refs file for the submodule.
646 static int resolve_gitlink_packed_ref(struct ref_cache
*refs
,
647 const char *refname
, unsigned char *sha1
)
649 struct ref_entry
*ref
;
650 struct ref_array
*array
= get_packed_refs(refs
);
652 ref
= search_ref_array(array
, refname
);
656 memcpy(sha1
, ref
->sha1
, 20);
660 static int resolve_gitlink_ref_recursive(struct ref_cache
*refs
,
661 const char *refname
, unsigned char *sha1
,
665 char buffer
[128], *p
;
668 if (recursion
> MAXDEPTH
|| strlen(refname
) > MAXREFLEN
)
671 ? git_path_submodule(refs
->name
, "%s", refname
)
672 : git_path("%s", refname
);
673 fd
= open(path
, O_RDONLY
);
675 return resolve_gitlink_packed_ref(refs
, refname
, sha1
);
677 len
= read(fd
, buffer
, sizeof(buffer
)-1);
681 while (len
&& isspace(buffer
[len
-1]))
685 /* Was it a detached head or an old-fashioned symlink? */
686 if (!get_sha1_hex(buffer
, sha1
))
690 if (strncmp(buffer
, "ref:", 4))
696 return resolve_gitlink_ref_recursive(refs
, p
, sha1
, recursion
+1);
699 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *sha1
)
701 int len
= strlen(path
), retval
;
703 struct ref_cache
*refs
;
705 while (len
&& path
[len
-1] == '/')
709 submodule
= xstrndup(path
, len
);
710 refs
= get_ref_cache(submodule
);
713 retval
= resolve_gitlink_ref_recursive(refs
, refname
, sha1
, 0);
718 * Try to read ref from the packed references. On success, set sha1
719 * and return 0; otherwise, return -1.
721 static int get_packed_ref(const char *refname
, unsigned char *sha1
)
723 struct ref_array
*packed
= get_packed_refs(get_ref_cache(NULL
));
724 struct ref_entry
*entry
= search_ref_array(packed
, refname
);
726 hashcpy(sha1
, entry
->sha1
);
732 const char *resolve_ref_unsafe(const char *refname
, unsigned char *sha1
, int reading
, int *flag
)
734 int depth
= MAXDEPTH
;
737 static char refname_buffer
[256];
742 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
754 git_snpath(path
, sizeof(path
), "%s", refname
);
756 if (lstat(path
, &st
) < 0) {
760 * The loose reference file does not exist;
761 * check for a packed reference.
763 if (!get_packed_ref(refname
, sha1
)) {
765 *flag
|= REF_ISPACKED
;
768 /* The reference is not a packed reference, either. */
777 /* Follow "normalized" - ie "refs/.." symlinks by hand */
778 if (S_ISLNK(st
.st_mode
)) {
779 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
783 if (!prefixcmp(buffer
, "refs/") &&
784 !check_refname_format(buffer
, 0)) {
785 strcpy(refname_buffer
, buffer
);
786 refname
= refname_buffer
;
788 *flag
|= REF_ISSYMREF
;
793 /* Is it a directory? */
794 if (S_ISDIR(st
.st_mode
)) {
800 * Anything else, just open it and try to use it as
803 fd
= open(path
, O_RDONLY
);
806 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
810 while (len
&& isspace(buffer
[len
-1]))
815 * Is it a symbolic ref?
817 if (prefixcmp(buffer
, "ref:"))
820 *flag
|= REF_ISSYMREF
;
822 while (isspace(*buf
))
824 if (check_refname_format(buf
, REFNAME_ALLOW_ONELEVEL
)) {
826 *flag
|= REF_ISBROKEN
;
829 refname
= strcpy(refname_buffer
, buf
);
831 /* Please note that FETCH_HEAD has a second line containing other data. */
832 if (get_sha1_hex(buffer
, sha1
) || (buffer
[40] != '\0' && !isspace(buffer
[40]))) {
834 *flag
|= REF_ISBROKEN
;
840 char *resolve_refdup(const char *ref
, unsigned char *sha1
, int reading
, int *flag
)
842 const char *ret
= resolve_ref_unsafe(ref
, sha1
, reading
, flag
);
843 return ret
? xstrdup(ret
) : NULL
;
846 /* The argument to filter_refs */
853 int read_ref_full(const char *refname
, unsigned char *sha1
, int reading
, int *flags
)
855 if (resolve_ref_unsafe(refname
, sha1
, reading
, flags
))
860 int read_ref(const char *refname
, unsigned char *sha1
)
862 return read_ref_full(refname
, sha1
, 1, NULL
);
865 int ref_exists(const char *refname
)
867 unsigned char sha1
[20];
868 return !!resolve_ref_unsafe(refname
, sha1
, 1, NULL
);
871 static int filter_refs(const char *refname
, const unsigned char *sha1
, int flags
,
874 struct ref_filter
*filter
= (struct ref_filter
*)data
;
875 if (fnmatch(filter
->pattern
, refname
, 0))
877 return filter
->fn(refname
, sha1
, flags
, filter
->cb_data
);
880 int peel_ref(const char *refname
, unsigned char *sha1
)
883 unsigned char base
[20];
886 if (current_ref
&& (current_ref
->name
== refname
887 || !strcmp(current_ref
->name
, refname
))) {
888 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
889 hashcpy(sha1
, current_ref
->peeled
);
892 hashcpy(base
, current_ref
->sha1
);
896 if (read_ref_full(refname
, base
, 1, &flag
))
899 if ((flag
& REF_ISPACKED
)) {
900 struct ref_array
*array
= get_packed_refs(get_ref_cache(NULL
));
901 struct ref_entry
*r
= search_ref_array(array
, refname
);
903 if (r
!= NULL
&& r
->flag
& REF_KNOWS_PEELED
) {
904 hashcpy(sha1
, r
->peeled
);
910 o
= parse_object(base
);
911 if (o
&& o
->type
== OBJ_TAG
) {
912 o
= deref_tag(o
, refname
, 0);
914 hashcpy(sha1
, o
->sha1
);
921 struct warn_if_dangling_data
{
927 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
928 int flags
, void *cb_data
)
930 struct warn_if_dangling_data
*d
= cb_data
;
931 const char *resolves_to
;
932 unsigned char junk
[20];
934 if (!(flags
& REF_ISSYMREF
))
937 resolves_to
= resolve_ref_unsafe(refname
, junk
, 0, NULL
);
938 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
941 fprintf(d
->fp
, d
->msg_fmt
, refname
);
945 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
947 struct warn_if_dangling_data data
;
950 data
.refname
= refname
;
951 data
.msg_fmt
= msg_fmt
;
952 for_each_rawref(warn_if_dangling_symref
, &data
);
955 static int do_for_each_ref(const char *submodule
, const char *base
, each_ref_fn fn
,
956 int trim
, int flags
, void *cb_data
)
958 struct ref_cache
*refs
= get_ref_cache(submodule
);
959 struct ref_array
*packed_refs
= get_packed_refs(refs
);
960 struct ref_array
*loose_refs
= get_loose_refs(refs
);
961 sort_ref_array(packed_refs
);
962 sort_ref_array(loose_refs
);
963 return do_for_each_ref_in_arrays(packed_refs
,
965 base
, fn
, trim
, flags
, cb_data
);
968 static int do_head_ref(const char *submodule
, each_ref_fn fn
, void *cb_data
)
970 unsigned char sha1
[20];
974 if (resolve_gitlink_ref(submodule
, "HEAD", sha1
) == 0)
975 return fn("HEAD", sha1
, 0, cb_data
);
980 if (!read_ref_full("HEAD", sha1
, 1, &flag
))
981 return fn("HEAD", sha1
, flag
, cb_data
);
986 int head_ref(each_ref_fn fn
, void *cb_data
)
988 return do_head_ref(NULL
, fn
, cb_data
);
991 int head_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
993 return do_head_ref(submodule
, fn
, cb_data
);
996 int for_each_ref(each_ref_fn fn
, void *cb_data
)
998 return do_for_each_ref(NULL
, "", fn
, 0, 0, cb_data
);
1001 int for_each_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
1003 return do_for_each_ref(submodule
, "", fn
, 0, 0, cb_data
);
1006 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
1008 return do_for_each_ref(NULL
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
1011 int for_each_ref_in_submodule(const char *submodule
, const char *prefix
,
1012 each_ref_fn fn
, void *cb_data
)
1014 return do_for_each_ref(submodule
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
1017 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
1019 return for_each_ref_in("refs/tags/", fn
, cb_data
);
1022 int for_each_tag_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
1024 return for_each_ref_in_submodule(submodule
, "refs/tags/", fn
, cb_data
);
1027 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
1029 return for_each_ref_in("refs/heads/", fn
, cb_data
);
1032 int for_each_branch_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
1034 return for_each_ref_in_submodule(submodule
, "refs/heads/", fn
, cb_data
);
1037 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
1039 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
1042 int for_each_remote_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
1044 return for_each_ref_in_submodule(submodule
, "refs/remotes/", fn
, cb_data
);
1047 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
1049 return do_for_each_ref(NULL
, "refs/replace/", fn
, 13, 0, cb_data
);
1052 int head_ref_namespaced(each_ref_fn fn
, void *cb_data
)
1054 struct strbuf buf
= STRBUF_INIT
;
1056 unsigned char sha1
[20];
1059 strbuf_addf(&buf
, "%sHEAD", get_git_namespace());
1060 if (!read_ref_full(buf
.buf
, sha1
, 1, &flag
))
1061 ret
= fn(buf
.buf
, sha1
, flag
, cb_data
);
1062 strbuf_release(&buf
);
1067 int for_each_namespaced_ref(each_ref_fn fn
, void *cb_data
)
1069 struct strbuf buf
= STRBUF_INIT
;
1071 strbuf_addf(&buf
, "%srefs/", get_git_namespace());
1072 ret
= do_for_each_ref(NULL
, buf
.buf
, fn
, 0, 0, cb_data
);
1073 strbuf_release(&buf
);
1077 int for_each_glob_ref_in(each_ref_fn fn
, const char *pattern
,
1078 const char *prefix
, void *cb_data
)
1080 struct strbuf real_pattern
= STRBUF_INIT
;
1081 struct ref_filter filter
;
1084 if (!prefix
&& prefixcmp(pattern
, "refs/"))
1085 strbuf_addstr(&real_pattern
, "refs/");
1087 strbuf_addstr(&real_pattern
, prefix
);
1088 strbuf_addstr(&real_pattern
, pattern
);
1090 if (!has_glob_specials(pattern
)) {
1091 /* Append implied '/' '*' if not present. */
1092 if (real_pattern
.buf
[real_pattern
.len
- 1] != '/')
1093 strbuf_addch(&real_pattern
, '/');
1094 /* No need to check for '*', there is none. */
1095 strbuf_addch(&real_pattern
, '*');
1098 filter
.pattern
= real_pattern
.buf
;
1100 filter
.cb_data
= cb_data
;
1101 ret
= for_each_ref(filter_refs
, &filter
);
1103 strbuf_release(&real_pattern
);
1107 int for_each_glob_ref(each_ref_fn fn
, const char *pattern
, void *cb_data
)
1109 return for_each_glob_ref_in(fn
, pattern
, NULL
, cb_data
);
1112 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
1114 return do_for_each_ref(NULL
, "", fn
, 0,
1115 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
1118 const char *prettify_refname(const char *name
)
1121 !prefixcmp(name
, "refs/heads/") ? 11 :
1122 !prefixcmp(name
, "refs/tags/") ? 10 :
1123 !prefixcmp(name
, "refs/remotes/") ? 13 :
1127 const char *ref_rev_parse_rules
[] = {
1132 "refs/remotes/%.*s",
1133 "refs/remotes/%.*s/HEAD",
1137 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
1140 const int abbrev_name_len
= strlen(abbrev_name
);
1142 for (p
= rules
; *p
; p
++) {
1143 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
1151 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
1152 const unsigned char *old_sha1
, int mustexist
)
1154 if (read_ref_full(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
1155 error("Can't verify ref %s", lock
->ref_name
);
1159 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
1160 error("Ref %s is at %s but expected %s", lock
->ref_name
,
1161 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
1168 static int remove_empty_directories(const char *file
)
1170 /* we want to create a file but there is a directory there;
1171 * if that is an empty directory (or a directory that contains
1172 * only empty directories), remove them.
1177 strbuf_init(&path
, 20);
1178 strbuf_addstr(&path
, file
);
1180 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
1182 strbuf_release(&path
);
1188 * *string and *len will only be substituted, and *string returned (for
1189 * later free()ing) if the string passed in is a magic short-hand form
1192 static char *substitute_branch_name(const char **string
, int *len
)
1194 struct strbuf buf
= STRBUF_INIT
;
1195 int ret
= interpret_branch_name(*string
, &buf
);
1199 *string
= strbuf_detach(&buf
, &size
);
1201 return (char *)*string
;
1207 int dwim_ref(const char *str
, int len
, unsigned char *sha1
, char **ref
)
1209 char *last_branch
= substitute_branch_name(&str
, &len
);
1214 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1215 char fullref
[PATH_MAX
];
1216 unsigned char sha1_from_ref
[20];
1217 unsigned char *this_result
;
1220 this_result
= refs_found
? sha1_from_ref
: sha1
;
1221 mksnpath(fullref
, sizeof(fullref
), *p
, len
, str
);
1222 r
= resolve_ref_unsafe(fullref
, this_result
, 1, &flag
);
1226 if (!warn_ambiguous_refs
)
1228 } else if ((flag
& REF_ISSYMREF
) && strcmp(fullref
, "HEAD")) {
1229 warning("ignoring dangling symref %s.", fullref
);
1230 } else if ((flag
& REF_ISBROKEN
) && strchr(fullref
, '/')) {
1231 warning("ignoring broken ref %s.", fullref
);
1238 int dwim_log(const char *str
, int len
, unsigned char *sha1
, char **log
)
1240 char *last_branch
= substitute_branch_name(&str
, &len
);
1245 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1247 unsigned char hash
[20];
1248 char path
[PATH_MAX
];
1249 const char *ref
, *it
;
1251 mksnpath(path
, sizeof(path
), *p
, len
, str
);
1252 ref
= resolve_ref_unsafe(path
, hash
, 1, NULL
);
1255 if (!stat(git_path("logs/%s", path
), &st
) &&
1256 S_ISREG(st
.st_mode
))
1258 else if (strcmp(ref
, path
) &&
1259 !stat(git_path("logs/%s", ref
), &st
) &&
1260 S_ISREG(st
.st_mode
))
1264 if (!logs_found
++) {
1266 hashcpy(sha1
, hash
);
1268 if (!warn_ambiguous_refs
)
1275 static struct ref_lock
*lock_ref_sha1_basic(const char *refname
,
1276 const unsigned char *old_sha1
,
1277 int flags
, int *type_p
)
1280 const char *orig_refname
= refname
;
1281 struct ref_lock
*lock
;
1284 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1287 lock
= xcalloc(1, sizeof(struct ref_lock
));
1290 refname
= resolve_ref_unsafe(refname
, lock
->old_sha1
, mustexist
, &type
);
1291 if (!refname
&& errno
== EISDIR
) {
1292 /* we are trying to lock foo but we used to
1293 * have foo/bar which now does not exist;
1294 * it is normal for the empty directory 'foo'
1297 ref_file
= git_path("%s", orig_refname
);
1298 if (remove_empty_directories(ref_file
)) {
1300 error("there are still refs under '%s'", orig_refname
);
1303 refname
= resolve_ref_unsafe(orig_refname
, lock
->old_sha1
, mustexist
, &type
);
1309 error("unable to resolve reference %s: %s",
1310 orig_refname
, strerror(errno
));
1313 missing
= is_null_sha1(lock
->old_sha1
);
1314 /* When the ref did not exist and we are creating it,
1315 * make sure there is no existing ref that is packed
1316 * whose name begins with our refname, nor a ref whose
1317 * name is a proper prefix of our refname.
1320 !is_refname_available(refname
, NULL
, get_packed_refs(get_ref_cache(NULL
)))) {
1321 last_errno
= ENOTDIR
;
1325 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1327 lflags
= LOCK_DIE_ON_ERROR
;
1328 if (flags
& REF_NODEREF
) {
1329 refname
= orig_refname
;
1330 lflags
|= LOCK_NODEREF
;
1332 lock
->ref_name
= xstrdup(refname
);
1333 lock
->orig_ref_name
= xstrdup(orig_refname
);
1334 ref_file
= git_path("%s", refname
);
1336 lock
->force_write
= 1;
1337 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
1338 lock
->force_write
= 1;
1340 if (safe_create_leading_directories(ref_file
)) {
1342 error("unable to create directory for %s", ref_file
);
1346 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
1347 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
1355 struct ref_lock
*lock_ref_sha1(const char *refname
, const unsigned char *old_sha1
)
1357 char refpath
[PATH_MAX
];
1358 if (check_refname_format(refname
, 0))
1360 strcpy(refpath
, mkpath("refs/%s", refname
));
1361 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
1364 struct ref_lock
*lock_any_ref_for_update(const char *refname
,
1365 const unsigned char *old_sha1
, int flags
)
1367 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
1369 return lock_ref_sha1_basic(refname
, old_sha1
, flags
, NULL
);
1372 struct repack_without_ref_sb
{
1373 const char *refname
;
1377 static int repack_without_ref_fn(const char *refname
, const unsigned char *sha1
,
1378 int flags
, void *cb_data
)
1380 struct repack_without_ref_sb
*data
= cb_data
;
1381 char line
[PATH_MAX
+ 100];
1384 if (!strcmp(data
->refname
, refname
))
1386 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1387 sha1_to_hex(sha1
), refname
);
1388 /* this should not happen but just being defensive */
1389 if (len
> sizeof(line
))
1390 die("too long a refname '%s'", refname
);
1391 write_or_die(data
->fd
, line
, len
);
1395 static struct lock_file packlock
;
1397 static int repack_without_ref(const char *refname
)
1399 struct repack_without_ref_sb data
;
1400 struct ref_array
*packed
= get_packed_refs(get_ref_cache(NULL
));
1401 sort_ref_array(packed
);
1402 if (search_ref_array(packed
, refname
) == NULL
)
1404 data
.refname
= refname
;
1405 data
.fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
1407 unable_to_lock_error(git_path("packed-refs"), errno
);
1408 return error("cannot delete '%s' from packed refs", refname
);
1410 do_for_each_ref_in_array(packed
, 0, "", repack_without_ref_fn
, 0, 0, &data
);
1411 return commit_lock_file(&packlock
);
1414 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1416 struct ref_lock
*lock
;
1417 int err
, i
= 0, ret
= 0, flag
= 0;
1419 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1422 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1426 if (!(delopt
& REF_NODEREF
)) {
1427 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1428 lock
->lk
->filename
[i
] = 0;
1429 path
= lock
->lk
->filename
;
1431 path
= git_path("%s", refname
);
1433 err
= unlink_or_warn(path
);
1434 if (err
&& errno
!= ENOENT
)
1437 if (!(delopt
& REF_NODEREF
))
1438 lock
->lk
->filename
[i
] = '.';
1440 /* removing the loose one could have resurrected an earlier
1441 * packed one. Also, if it was not loose we need to repack
1444 ret
|= repack_without_ref(refname
);
1446 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1447 invalidate_ref_cache(NULL
);
1453 * People using contrib's git-new-workdir have .git/logs/refs ->
1454 * /some/other/path/.git/logs/refs, and that may live on another device.
1456 * IOW, to avoid cross device rename errors, the temporary renamed log must
1457 * live into logs/refs.
1459 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1461 int rename_ref(const char *oldrefname
, const char *newrefname
, const char *logmsg
)
1463 unsigned char sha1
[20], orig_sha1
[20];
1464 int flag
= 0, logmoved
= 0;
1465 struct ref_lock
*lock
;
1466 struct stat loginfo
;
1467 int log
= !lstat(git_path("logs/%s", oldrefname
), &loginfo
);
1468 const char *symref
= NULL
;
1469 struct ref_cache
*refs
= get_ref_cache(NULL
);
1471 if (log
&& S_ISLNK(loginfo
.st_mode
))
1472 return error("reflog for %s is a symlink", oldrefname
);
1474 symref
= resolve_ref_unsafe(oldrefname
, orig_sha1
, 1, &flag
);
1475 if (flag
& REF_ISSYMREF
)
1476 return error("refname %s is a symbolic ref, renaming it is not supported",
1479 return error("refname %s not found", oldrefname
);
1481 if (!is_refname_available(newrefname
, oldrefname
, get_packed_refs(refs
)))
1484 if (!is_refname_available(newrefname
, oldrefname
, get_loose_refs(refs
)))
1487 if (log
&& rename(git_path("logs/%s", oldrefname
), git_path(TMP_RENAMED_LOG
)))
1488 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG
": %s",
1489 oldrefname
, strerror(errno
));
1491 if (delete_ref(oldrefname
, orig_sha1
, REF_NODEREF
)) {
1492 error("unable to delete old %s", oldrefname
);
1496 if (!read_ref_full(newrefname
, sha1
, 1, &flag
) &&
1497 delete_ref(newrefname
, sha1
, REF_NODEREF
)) {
1498 if (errno
==EISDIR
) {
1499 if (remove_empty_directories(git_path("%s", newrefname
))) {
1500 error("Directory not empty: %s", newrefname
);
1504 error("unable to delete existing %s", newrefname
);
1509 if (log
&& safe_create_leading_directories(git_path("logs/%s", newrefname
))) {
1510 error("unable to create directory for %s", newrefname
);
1515 if (log
&& rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", newrefname
))) {
1516 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1518 * rename(a, b) when b is an existing
1519 * directory ought to result in ISDIR, but
1520 * Solaris 5.8 gives ENOTDIR. Sheesh.
1522 if (remove_empty_directories(git_path("logs/%s", newrefname
))) {
1523 error("Directory not empty: logs/%s", newrefname
);
1528 error("unable to move logfile "TMP_RENAMED_LOG
" to logs/%s: %s",
1529 newrefname
, strerror(errno
));
1535 lock
= lock_ref_sha1_basic(newrefname
, NULL
, 0, NULL
);
1537 error("unable to lock %s for update", newrefname
);
1540 lock
->force_write
= 1;
1541 hashcpy(lock
->old_sha1
, orig_sha1
);
1542 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1543 error("unable to write current sha1 into %s", newrefname
);
1550 lock
= lock_ref_sha1_basic(oldrefname
, NULL
, 0, NULL
);
1552 error("unable to lock %s for rollback", oldrefname
);
1556 lock
->force_write
= 1;
1557 flag
= log_all_ref_updates
;
1558 log_all_ref_updates
= 0;
1559 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1560 error("unable to write current sha1 into %s", oldrefname
);
1561 log_all_ref_updates
= flag
;
1564 if (logmoved
&& rename(git_path("logs/%s", newrefname
), git_path("logs/%s", oldrefname
)))
1565 error("unable to restore logfile %s from %s: %s",
1566 oldrefname
, newrefname
, strerror(errno
));
1567 if (!logmoved
&& log
&&
1568 rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", oldrefname
)))
1569 error("unable to restore logfile %s from "TMP_RENAMED_LOG
": %s",
1570 oldrefname
, strerror(errno
));
1575 int close_ref(struct ref_lock
*lock
)
1577 if (close_lock_file(lock
->lk
))
1583 int commit_ref(struct ref_lock
*lock
)
1585 if (commit_lock_file(lock
->lk
))
1591 void unlock_ref(struct ref_lock
*lock
)
1593 /* Do not free lock->lk -- atexit() still looks at them */
1595 rollback_lock_file(lock
->lk
);
1596 free(lock
->ref_name
);
1597 free(lock
->orig_ref_name
);
1602 * copy the reflog message msg to buf, which has been allocated sufficiently
1603 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1604 * because reflog file is one line per entry.
1606 static int copy_msg(char *buf
, const char *msg
)
1613 while ((c
= *msg
++)) {
1614 if (wasspace
&& isspace(c
))
1616 wasspace
= isspace(c
);
1621 while (buf
< cp
&& isspace(cp
[-1]))
1627 int log_ref_setup(const char *refname
, char *logfile
, int bufsize
)
1629 int logfd
, oflags
= O_APPEND
| O_WRONLY
;
1631 git_snpath(logfile
, bufsize
, "logs/%s", refname
);
1632 if (log_all_ref_updates
&&
1633 (!prefixcmp(refname
, "refs/heads/") ||
1634 !prefixcmp(refname
, "refs/remotes/") ||
1635 !prefixcmp(refname
, "refs/notes/") ||
1636 !strcmp(refname
, "HEAD"))) {
1637 if (safe_create_leading_directories(logfile
) < 0)
1638 return error("unable to create directory for %s",
1643 logfd
= open(logfile
, oflags
, 0666);
1645 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1648 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1649 if (remove_empty_directories(logfile
)) {
1650 return error("There are still logs under '%s'",
1653 logfd
= open(logfile
, oflags
, 0666);
1657 return error("Unable to append to %s: %s",
1658 logfile
, strerror(errno
));
1661 adjust_shared_perm(logfile
);
1666 static int log_ref_write(const char *refname
, const unsigned char *old_sha1
,
1667 const unsigned char *new_sha1
, const char *msg
)
1669 int logfd
, result
, written
, oflags
= O_APPEND
| O_WRONLY
;
1670 unsigned maxlen
, len
;
1672 char log_file
[PATH_MAX
];
1674 const char *committer
;
1676 if (log_all_ref_updates
< 0)
1677 log_all_ref_updates
= !is_bare_repository();
1679 result
= log_ref_setup(refname
, log_file
, sizeof(log_file
));
1683 logfd
= open(log_file
, oflags
);
1686 msglen
= msg
? strlen(msg
) : 0;
1687 committer
= git_committer_info(0);
1688 maxlen
= strlen(committer
) + msglen
+ 100;
1689 logrec
= xmalloc(maxlen
);
1690 len
= sprintf(logrec
, "%s %s %s\n",
1691 sha1_to_hex(old_sha1
),
1692 sha1_to_hex(new_sha1
),
1695 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1696 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1698 if (close(logfd
) != 0 || written
!= len
)
1699 return error("Unable to append to %s", log_file
);
1703 static int is_branch(const char *refname
)
1705 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1708 int write_ref_sha1(struct ref_lock
*lock
,
1709 const unsigned char *sha1
, const char *logmsg
)
1711 static char term
= '\n';
1716 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1720 o
= parse_object(sha1
);
1722 error("Trying to write ref %s with nonexistent object %s",
1723 lock
->ref_name
, sha1_to_hex(sha1
));
1727 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1728 error("Trying to write non-commit object %s to branch %s",
1729 sha1_to_hex(sha1
), lock
->ref_name
);
1733 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1734 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1735 || close_ref(lock
) < 0) {
1736 error("Couldn't write %s", lock
->lk
->filename
);
1740 clear_loose_ref_cache(get_ref_cache(NULL
));
1741 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1742 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1743 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1747 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1749 * Special hack: If a branch is updated directly and HEAD
1750 * points to it (may happen on the remote side of a push
1751 * for example) then logically the HEAD reflog should be
1753 * A generic solution implies reverse symref information,
1754 * but finding all symrefs pointing to the given branch
1755 * would be rather costly for this rare event (the direct
1756 * update of a branch) to be worth it. So let's cheat and
1757 * check with HEAD only which should cover 99% of all usage
1758 * scenarios (even 100% of the default ones).
1760 unsigned char head_sha1
[20];
1762 const char *head_ref
;
1763 head_ref
= resolve_ref_unsafe("HEAD", head_sha1
, 1, &head_flag
);
1764 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1765 !strcmp(head_ref
, lock
->ref_name
))
1766 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1768 if (commit_ref(lock
)) {
1769 error("Couldn't set %s", lock
->ref_name
);
1777 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1780 const char *lockpath
;
1782 int fd
, len
, written
;
1783 char *git_HEAD
= git_pathdup("%s", ref_target
);
1784 unsigned char old_sha1
[20], new_sha1
[20];
1786 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1789 if (safe_create_leading_directories(git_HEAD
) < 0)
1790 return error("unable to create directory for %s", git_HEAD
);
1792 #ifndef NO_SYMLINK_HEAD
1793 if (prefer_symlink_refs
) {
1795 if (!symlink(refs_heads_master
, git_HEAD
))
1797 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1801 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1802 if (sizeof(ref
) <= len
) {
1803 error("refname too long: %s", refs_heads_master
);
1804 goto error_free_return
;
1806 lockpath
= mkpath("%s.lock", git_HEAD
);
1807 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1809 error("Unable to open %s for writing", lockpath
);
1810 goto error_free_return
;
1812 written
= write_in_full(fd
, ref
, len
);
1813 if (close(fd
) != 0 || written
!= len
) {
1814 error("Unable to write to %s", lockpath
);
1815 goto error_unlink_return
;
1817 if (rename(lockpath
, git_HEAD
) < 0) {
1818 error("Unable to create %s", git_HEAD
);
1819 goto error_unlink_return
;
1821 if (adjust_shared_perm(git_HEAD
)) {
1822 error("Unable to fix permissions on %s", lockpath
);
1823 error_unlink_return
:
1824 unlink_or_warn(lockpath
);
1830 #ifndef NO_SYMLINK_HEAD
1833 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1834 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1840 static char *ref_msg(const char *line
, const char *endp
)
1844 ep
= memchr(line
, '\n', endp
- line
);
1847 return xmemdupz(line
, ep
- line
);
1850 int read_ref_at(const char *refname
, unsigned long at_time
, int cnt
,
1851 unsigned char *sha1
, char **msg
,
1852 unsigned long *cutoff_time
, int *cutoff_tz
, int *cutoff_cnt
)
1854 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1856 int logfd
, tz
, reccnt
= 0;
1859 unsigned char logged_sha1
[20];
1863 logfile
= git_path("logs/%s", refname
);
1864 logfd
= open(logfile
, O_RDONLY
, 0);
1866 die_errno("Unable to read log '%s'", logfile
);
1869 die("Log %s is empty.", logfile
);
1870 mapsz
= xsize_t(st
.st_size
);
1871 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1872 logdata
= log_mapped
;
1876 rec
= logend
= logdata
+ st
.st_size
;
1877 while (logdata
< rec
) {
1879 if (logdata
< rec
&& *(rec
-1) == '\n')
1882 while (logdata
< rec
&& *(rec
-1) != '\n') {
1888 die("Log %s is corrupt.", logfile
);
1889 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1890 if (date
<= at_time
|| cnt
== 0) {
1891 tz
= strtoul(tz_c
, NULL
, 10);
1893 *msg
= ref_msg(rec
, logend
);
1895 *cutoff_time
= date
;
1899 *cutoff_cnt
= reccnt
- 1;
1901 if (get_sha1_hex(lastrec
, logged_sha1
))
1902 die("Log %s is corrupt.", logfile
);
1903 if (get_sha1_hex(rec
+ 41, sha1
))
1904 die("Log %s is corrupt.", logfile
);
1905 if (hashcmp(logged_sha1
, sha1
)) {
1906 warning("Log %s has gap after %s.",
1907 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1910 else if (date
== at_time
) {
1911 if (get_sha1_hex(rec
+ 41, sha1
))
1912 die("Log %s is corrupt.", logfile
);
1915 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1916 die("Log %s is corrupt.", logfile
);
1917 if (hashcmp(logged_sha1
, sha1
)) {
1918 warning("Log %s unexpectedly ended on %s.",
1919 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1922 munmap(log_mapped
, mapsz
);
1931 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1933 if (rec
== logend
|| *rec
== '\n')
1934 die("Log %s is corrupt.", logfile
);
1935 date
= strtoul(rec
+ 1, &tz_c
, 10);
1936 tz
= strtoul(tz_c
, NULL
, 10);
1937 if (get_sha1_hex(logdata
, sha1
))
1938 die("Log %s is corrupt.", logfile
);
1939 if (is_null_sha1(sha1
)) {
1940 if (get_sha1_hex(logdata
+ 41, sha1
))
1941 die("Log %s is corrupt.", logfile
);
1944 *msg
= ref_msg(logdata
, logend
);
1945 munmap(log_mapped
, mapsz
);
1948 *cutoff_time
= date
;
1952 *cutoff_cnt
= reccnt
;
1956 int for_each_recent_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1958 const char *logfile
;
1960 struct strbuf sb
= STRBUF_INIT
;
1963 logfile
= git_path("logs/%s", refname
);
1964 logfp
= fopen(logfile
, "r");
1969 struct stat statbuf
;
1970 if (fstat(fileno(logfp
), &statbuf
) ||
1971 statbuf
.st_size
< ofs
||
1972 fseek(logfp
, -ofs
, SEEK_END
) ||
1973 strbuf_getwholeline(&sb
, logfp
, '\n')) {
1975 strbuf_release(&sb
);
1980 while (!strbuf_getwholeline(&sb
, logfp
, '\n')) {
1981 unsigned char osha1
[20], nsha1
[20];
1982 char *email_end
, *message
;
1983 unsigned long timestamp
;
1986 /* old SP new SP name <email> SP time TAB msg LF */
1987 if (sb
.len
< 83 || sb
.buf
[sb
.len
- 1] != '\n' ||
1988 get_sha1_hex(sb
.buf
, osha1
) || sb
.buf
[40] != ' ' ||
1989 get_sha1_hex(sb
.buf
+ 41, nsha1
) || sb
.buf
[81] != ' ' ||
1990 !(email_end
= strchr(sb
.buf
+ 82, '>')) ||
1991 email_end
[1] != ' ' ||
1992 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1993 !message
|| message
[0] != ' ' ||
1994 (message
[1] != '+' && message
[1] != '-') ||
1995 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1996 !isdigit(message
[4]) || !isdigit(message
[5]))
1997 continue; /* corrupt? */
1998 email_end
[1] = '\0';
1999 tz
= strtol(message
+ 1, NULL
, 10);
2000 if (message
[6] != '\t')
2004 ret
= fn(osha1
, nsha1
, sb
.buf
+ 82, timestamp
, tz
, message
,
2010 strbuf_release(&sb
);
2014 int for_each_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, void *cb_data
)
2016 return for_each_recent_reflog_ent(refname
, fn
, 0, cb_data
);
2019 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
2021 DIR *dir
= opendir(git_path("logs/%s", base
));
2026 int baselen
= strlen(base
);
2027 char *log
= xmalloc(baselen
+ 257);
2029 memcpy(log
, base
, baselen
);
2030 if (baselen
&& base
[baselen
-1] != '/')
2031 log
[baselen
++] = '/';
2033 while ((de
= readdir(dir
)) != NULL
) {
2037 if (de
->d_name
[0] == '.')
2039 namelen
= strlen(de
->d_name
);
2042 if (has_extension(de
->d_name
, ".lock"))
2044 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
2045 if (stat(git_path("logs/%s", log
), &st
) < 0)
2047 if (S_ISDIR(st
.st_mode
)) {
2048 retval
= do_for_each_reflog(log
, fn
, cb_data
);
2050 unsigned char sha1
[20];
2051 if (read_ref_full(log
, sha1
, 0, NULL
))
2052 retval
= error("bad ref for %s", log
);
2054 retval
= fn(log
, sha1
, 0, cb_data
);
2067 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
2069 return do_for_each_reflog("", fn
, cb_data
);
2072 int update_ref(const char *action
, const char *refname
,
2073 const unsigned char *sha1
, const unsigned char *oldval
,
2074 int flags
, enum action_on_err onerr
)
2076 static struct ref_lock
*lock
;
2077 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
2079 const char *str
= "Cannot lock the ref '%s'.";
2081 case MSG_ON_ERR
: error(str
, refname
); break;
2082 case DIE_ON_ERR
: die(str
, refname
); break;
2083 case QUIET_ON_ERR
: break;
2087 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
2088 const char *str
= "Cannot update the ref '%s'.";
2090 case MSG_ON_ERR
: error(str
, refname
); break;
2091 case DIE_ON_ERR
: die(str
, refname
); break;
2092 case QUIET_ON_ERR
: break;
2099 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
2101 for ( ; list
; list
= list
->next
)
2102 if (!strcmp(list
->name
, name
))
2103 return (struct ref
*)list
;
2108 * generate a format suitable for scanf from a ref_rev_parse_rules
2109 * rule, that is replace the "%.*s" spec with a "%s" spec
2111 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
2115 spec
= strstr(rule
, "%.*s");
2116 if (!spec
|| strstr(spec
+ 4, "%.*s"))
2117 die("invalid rule in ref_rev_parse_rules: %s", rule
);
2119 /* copy all until spec */
2120 strncpy(scanf_fmt
, rule
, spec
- rule
);
2121 scanf_fmt
[spec
- rule
] = '\0';
2123 strcat(scanf_fmt
, "%s");
2124 /* copy remaining rule */
2125 strcat(scanf_fmt
, spec
+ 4);
2130 char *shorten_unambiguous_ref(const char *refname
, int strict
)
2133 static char **scanf_fmts
;
2134 static int nr_rules
;
2137 /* pre generate scanf formats from ref_rev_parse_rules[] */
2139 size_t total_len
= 0;
2141 /* the rule list is NULL terminated, count them first */
2142 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
2143 /* no +1 because strlen("%s") < strlen("%.*s") */
2144 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
2146 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
2149 for (i
= 0; i
< nr_rules
; i
++) {
2150 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
2152 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
2153 total_len
+= strlen(ref_rev_parse_rules
[i
]);
2157 /* bail out if there are no rules */
2159 return xstrdup(refname
);
2161 /* buffer for scanf result, at most refname must fit */
2162 short_name
= xstrdup(refname
);
2164 /* skip first rule, it will always match */
2165 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
2167 int rules_to_fail
= i
;
2170 if (1 != sscanf(refname
, scanf_fmts
[i
], short_name
))
2173 short_name_len
= strlen(short_name
);
2176 * in strict mode, all (except the matched one) rules
2177 * must fail to resolve to a valid non-ambiguous ref
2180 rules_to_fail
= nr_rules
;
2183 * check if the short name resolves to a valid ref,
2184 * but use only rules prior to the matched one
2186 for (j
= 0; j
< rules_to_fail
; j
++) {
2187 const char *rule
= ref_rev_parse_rules
[j
];
2188 char refname
[PATH_MAX
];
2190 /* skip matched rule */
2195 * the short name is ambiguous, if it resolves
2196 * (with this previous rule) to a valid ref
2197 * read_ref() returns 0 on success
2199 mksnpath(refname
, sizeof(refname
),
2200 rule
, short_name_len
, short_name
);
2201 if (ref_exists(refname
))
2206 * short name is non-ambiguous if all previous rules
2207 * haven't resolved to a valid ref
2209 if (j
== rules_to_fail
)
2214 return xstrdup(refname
);