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 a reference named refname could be created without
338 * conflicting with the name of an existing reference. If oldrefname
339 * is non-NULL, ignore potential conflicts with oldrefname (e.g.,
340 * because oldrefname is scheduled for deletion in the same
343 static int is_refname_available(const char *refname
, const char *oldrefname
,
344 struct ref_array
*array
)
346 int i
, namlen
= strlen(refname
); /* e.g. 'foo/bar' */
347 for (i
= 0; i
< array
->nr
; i
++) {
348 struct ref_entry
*entry
= array
->refs
[i
];
349 /* entry->name could be 'foo' or 'foo/bar/baz' */
350 if (!oldrefname
|| strcmp(oldrefname
, entry
->name
)) {
351 int len
= strlen(entry
->name
);
352 int cmplen
= (namlen
< len
) ? namlen
: len
;
353 const char *lead
= (namlen
< len
) ? entry
->name
: refname
;
354 if (!strncmp(refname
, entry
->name
, cmplen
) &&
355 lead
[cmplen
] == '/') {
356 error("'%s' exists; cannot create '%s'",
357 entry
->name
, refname
);
366 * Future: need to be in "struct repository"
367 * when doing a full libification.
369 static struct ref_cache
{
370 struct ref_cache
*next
;
373 struct ref_array loose
;
374 struct ref_array packed
;
375 /* The submodule name, or "" for the main repo. */
376 char name
[FLEX_ARRAY
];
379 static void clear_packed_ref_cache(struct ref_cache
*refs
)
381 if (refs
->did_packed
)
382 clear_ref_array(&refs
->packed
);
383 refs
->did_packed
= 0;
386 static void clear_loose_ref_cache(struct ref_cache
*refs
)
389 clear_ref_array(&refs
->loose
);
393 static struct ref_cache
*create_ref_cache(const char *submodule
)
396 struct ref_cache
*refs
;
399 len
= strlen(submodule
) + 1;
400 refs
= xcalloc(1, sizeof(struct ref_cache
) + len
);
401 memcpy(refs
->name
, submodule
, len
);
406 * Return a pointer to a ref_cache for the specified submodule. For
407 * the main repository, use submodule==NULL. The returned structure
408 * will be allocated and initialized but not necessarily populated; it
409 * should not be freed.
411 static struct ref_cache
*get_ref_cache(const char *submodule
)
413 struct ref_cache
*refs
= ref_cache
;
417 if (!strcmp(submodule
, refs
->name
))
422 refs
= create_ref_cache(submodule
);
423 refs
->next
= ref_cache
;
428 void invalidate_ref_cache(const char *submodule
)
430 struct ref_cache
*refs
= get_ref_cache(submodule
);
431 clear_packed_ref_cache(refs
);
432 clear_loose_ref_cache(refs
);
436 * Parse one line from a packed-refs file. Write the SHA1 to sha1.
437 * Return a pointer to the refname within the line (null-terminated),
438 * or NULL if there was a problem.
440 static const char *parse_ref_line(char *line
, unsigned char *sha1
)
443 * 42: the answer to everything.
445 * In this case, it happens to be the answer to
446 * 40 (length of sha1 hex representation)
447 * +1 (space in between hex and name)
448 * +1 (newline at the end of the line)
450 int len
= strlen(line
) - 42;
454 if (get_sha1_hex(line
, sha1
) < 0)
456 if (!isspace(line
[40]))
461 if (line
[len
] != '\n')
468 static void read_packed_refs(FILE *f
, struct ref_array
*array
)
470 struct ref_entry
*last
= NULL
;
471 char refline
[PATH_MAX
];
472 int flag
= REF_ISPACKED
;
474 while (fgets(refline
, sizeof(refline
), f
)) {
475 unsigned char sha1
[20];
477 static const char header
[] = "# pack-refs with:";
479 if (!strncmp(refline
, header
, sizeof(header
)-1)) {
480 const char *traits
= refline
+ sizeof(header
) - 1;
481 if (strstr(traits
, " peeled "))
482 flag
|= REF_KNOWS_PEELED
;
483 /* perhaps other traits later as well */
487 refname
= parse_ref_line(refline
, sha1
);
489 last
= create_ref_entry(refname
, sha1
, flag
, 1);
490 add_ref(array
, last
);
495 strlen(refline
) == 42 &&
496 refline
[41] == '\n' &&
497 !get_sha1_hex(refline
+ 1, sha1
))
498 hashcpy(last
->peeled
, sha1
);
502 static struct ref_array
*get_packed_refs(struct ref_cache
*refs
)
504 if (!refs
->did_packed
) {
505 const char *packed_refs_file
;
509 packed_refs_file
= git_path_submodule(refs
->name
, "packed-refs");
511 packed_refs_file
= git_path("packed-refs");
512 f
= fopen(packed_refs_file
, "r");
514 read_packed_refs(f
, &refs
->packed
);
517 refs
->did_packed
= 1;
519 return &refs
->packed
;
522 void add_packed_ref(const char *refname
, const unsigned char *sha1
)
524 add_ref(get_packed_refs(get_ref_cache(NULL
)),
525 create_ref_entry(refname
, sha1
, REF_ISPACKED
, 1));
528 static void get_ref_dir(struct ref_cache
*refs
, const char *base
,
529 struct ref_array
*array
)
535 path
= git_path_submodule(refs
->name
, "%s", base
);
537 path
= git_path("%s", base
);
543 int baselen
= strlen(base
);
544 char *refname
= xmalloc(baselen
+ 257);
546 memcpy(refname
, base
, baselen
);
547 if (baselen
&& base
[baselen
-1] != '/')
548 refname
[baselen
++] = '/';
550 while ((de
= readdir(dir
)) != NULL
) {
551 unsigned char sha1
[20];
557 if (de
->d_name
[0] == '.')
559 namelen
= strlen(de
->d_name
);
562 if (has_extension(de
->d_name
, ".lock"))
564 memcpy(refname
+ baselen
, de
->d_name
, namelen
+1);
566 ? git_path_submodule(refs
->name
, "%s", refname
)
567 : git_path("%s", refname
);
568 if (stat(refdir
, &st
) < 0)
570 if (S_ISDIR(st
.st_mode
)) {
571 get_ref_dir(refs
, refname
, array
);
577 if (resolve_gitlink_ref(refs
->name
, refname
, sha1
) < 0) {
579 flag
|= REF_ISBROKEN
;
581 } else if (read_ref_full(refname
, sha1
, 1, &flag
)) {
583 flag
|= REF_ISBROKEN
;
585 add_ref(array
, create_ref_entry(refname
, sha1
, flag
, 1));
592 static struct ref_array
*get_loose_refs(struct ref_cache
*refs
)
594 if (!refs
->did_loose
) {
595 get_ref_dir(refs
, "refs", &refs
->loose
);
601 /* We allow "recursive" symbolic refs. Only within reason, though */
603 #define MAXREFLEN (1024)
606 * Called by resolve_gitlink_ref_recursive() after it failed to read
607 * from the loose refs in ref_cache refs. Find <refname> in the
608 * packed-refs file for the submodule.
610 static int resolve_gitlink_packed_ref(struct ref_cache
*refs
,
611 const char *refname
, unsigned char *sha1
)
613 struct ref_entry
*ref
;
614 struct ref_array
*array
= get_packed_refs(refs
);
616 ref
= search_ref_array(array
, refname
);
620 memcpy(sha1
, ref
->sha1
, 20);
624 static int resolve_gitlink_ref_recursive(struct ref_cache
*refs
,
625 const char *refname
, unsigned char *sha1
,
629 char buffer
[128], *p
;
632 if (recursion
> MAXDEPTH
|| strlen(refname
) > MAXREFLEN
)
635 ? git_path_submodule(refs
->name
, "%s", refname
)
636 : git_path("%s", refname
);
637 fd
= open(path
, O_RDONLY
);
639 return resolve_gitlink_packed_ref(refs
, refname
, sha1
);
641 len
= read(fd
, buffer
, sizeof(buffer
)-1);
645 while (len
&& isspace(buffer
[len
-1]))
649 /* Was it a detached head or an old-fashioned symlink? */
650 if (!get_sha1_hex(buffer
, sha1
))
654 if (strncmp(buffer
, "ref:", 4))
660 return resolve_gitlink_ref_recursive(refs
, p
, sha1
, recursion
+1);
663 int resolve_gitlink_ref(const char *path
, const char *refname
, unsigned char *sha1
)
665 int len
= strlen(path
), retval
;
667 struct ref_cache
*refs
;
669 while (len
&& path
[len
-1] == '/')
673 submodule
= xstrndup(path
, len
);
674 refs
= get_ref_cache(submodule
);
677 retval
= resolve_gitlink_ref_recursive(refs
, refname
, sha1
, 0);
682 * Try to read ref from the packed references. On success, set sha1
683 * and return 0; otherwise, return -1.
685 static int get_packed_ref(const char *refname
, unsigned char *sha1
)
687 struct ref_array
*packed
= get_packed_refs(get_ref_cache(NULL
));
688 struct ref_entry
*entry
= search_ref_array(packed
, refname
);
690 hashcpy(sha1
, entry
->sha1
);
696 const char *resolve_ref_unsafe(const char *refname
, unsigned char *sha1
, int reading
, int *flag
)
698 int depth
= MAXDEPTH
;
701 static char refname_buffer
[256];
706 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
718 git_snpath(path
, sizeof(path
), "%s", refname
);
720 if (lstat(path
, &st
) < 0) {
724 * The loose reference file does not exist;
725 * check for a packed reference.
727 if (!get_packed_ref(refname
, sha1
)) {
729 *flag
|= REF_ISPACKED
;
732 /* The reference is not a packed reference, either. */
741 /* Follow "normalized" - ie "refs/.." symlinks by hand */
742 if (S_ISLNK(st
.st_mode
)) {
743 len
= readlink(path
, buffer
, sizeof(buffer
)-1);
747 if (!prefixcmp(buffer
, "refs/") &&
748 !check_refname_format(buffer
, 0)) {
749 strcpy(refname_buffer
, buffer
);
750 refname
= refname_buffer
;
752 *flag
|= REF_ISSYMREF
;
757 /* Is it a directory? */
758 if (S_ISDIR(st
.st_mode
)) {
764 * Anything else, just open it and try to use it as
767 fd
= open(path
, O_RDONLY
);
770 len
= read_in_full(fd
, buffer
, sizeof(buffer
)-1);
774 while (len
&& isspace(buffer
[len
-1]))
779 * Is it a symbolic ref?
781 if (prefixcmp(buffer
, "ref:"))
784 *flag
|= REF_ISSYMREF
;
786 while (isspace(*buf
))
788 if (check_refname_format(buf
, REFNAME_ALLOW_ONELEVEL
)) {
790 *flag
|= REF_ISBROKEN
;
793 refname
= strcpy(refname_buffer
, buf
);
795 /* Please note that FETCH_HEAD has a second line containing other data. */
796 if (get_sha1_hex(buffer
, sha1
) || (buffer
[40] != '\0' && !isspace(buffer
[40]))) {
798 *flag
|= REF_ISBROKEN
;
804 char *resolve_refdup(const char *ref
, unsigned char *sha1
, int reading
, int *flag
)
806 const char *ret
= resolve_ref_unsafe(ref
, sha1
, reading
, flag
);
807 return ret
? xstrdup(ret
) : NULL
;
810 /* The argument to filter_refs */
817 int read_ref_full(const char *refname
, unsigned char *sha1
, int reading
, int *flags
)
819 if (resolve_ref_unsafe(refname
, sha1
, reading
, flags
))
824 int read_ref(const char *refname
, unsigned char *sha1
)
826 return read_ref_full(refname
, sha1
, 1, NULL
);
829 int ref_exists(const char *refname
)
831 unsigned char sha1
[20];
832 return !!resolve_ref_unsafe(refname
, sha1
, 1, NULL
);
835 static int filter_refs(const char *refname
, const unsigned char *sha1
, int flags
,
838 struct ref_filter
*filter
= (struct ref_filter
*)data
;
839 if (fnmatch(filter
->pattern
, refname
, 0))
841 return filter
->fn(refname
, sha1
, flags
, filter
->cb_data
);
844 int peel_ref(const char *refname
, unsigned char *sha1
)
847 unsigned char base
[20];
850 if (current_ref
&& (current_ref
->name
== refname
851 || !strcmp(current_ref
->name
, refname
))) {
852 if (current_ref
->flag
& REF_KNOWS_PEELED
) {
853 hashcpy(sha1
, current_ref
->peeled
);
856 hashcpy(base
, current_ref
->sha1
);
860 if (read_ref_full(refname
, base
, 1, &flag
))
863 if ((flag
& REF_ISPACKED
)) {
864 struct ref_array
*array
= get_packed_refs(get_ref_cache(NULL
));
865 struct ref_entry
*r
= search_ref_array(array
, refname
);
867 if (r
!= NULL
&& r
->flag
& REF_KNOWS_PEELED
) {
868 hashcpy(sha1
, r
->peeled
);
874 o
= parse_object(base
);
875 if (o
&& o
->type
== OBJ_TAG
) {
876 o
= deref_tag(o
, refname
, 0);
878 hashcpy(sha1
, o
->sha1
);
885 struct warn_if_dangling_data
{
891 static int warn_if_dangling_symref(const char *refname
, const unsigned char *sha1
,
892 int flags
, void *cb_data
)
894 struct warn_if_dangling_data
*d
= cb_data
;
895 const char *resolves_to
;
896 unsigned char junk
[20];
898 if (!(flags
& REF_ISSYMREF
))
901 resolves_to
= resolve_ref_unsafe(refname
, junk
, 0, NULL
);
902 if (!resolves_to
|| strcmp(resolves_to
, d
->refname
))
905 fprintf(d
->fp
, d
->msg_fmt
, refname
);
909 void warn_dangling_symref(FILE *fp
, const char *msg_fmt
, const char *refname
)
911 struct warn_if_dangling_data data
;
914 data
.refname
= refname
;
915 data
.msg_fmt
= msg_fmt
;
916 for_each_rawref(warn_if_dangling_symref
, &data
);
919 static int do_for_each_ref(const char *submodule
, const char *base
, each_ref_fn fn
,
920 int trim
, int flags
, void *cb_data
)
922 struct ref_cache
*refs
= get_ref_cache(submodule
);
923 struct ref_array
*packed_refs
= get_packed_refs(refs
);
924 struct ref_array
*loose_refs
= get_loose_refs(refs
);
925 sort_ref_array(packed_refs
);
926 sort_ref_array(loose_refs
);
927 return do_for_each_ref_in_arrays(packed_refs
,
929 base
, fn
, trim
, flags
, cb_data
);
932 static int do_head_ref(const char *submodule
, each_ref_fn fn
, void *cb_data
)
934 unsigned char sha1
[20];
938 if (resolve_gitlink_ref(submodule
, "HEAD", sha1
) == 0)
939 return fn("HEAD", sha1
, 0, cb_data
);
944 if (!read_ref_full("HEAD", sha1
, 1, &flag
))
945 return fn("HEAD", sha1
, flag
, cb_data
);
950 int head_ref(each_ref_fn fn
, void *cb_data
)
952 return do_head_ref(NULL
, fn
, cb_data
);
955 int head_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
957 return do_head_ref(submodule
, fn
, cb_data
);
960 int for_each_ref(each_ref_fn fn
, void *cb_data
)
962 return do_for_each_ref(NULL
, "", fn
, 0, 0, cb_data
);
965 int for_each_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
967 return do_for_each_ref(submodule
, "", fn
, 0, 0, cb_data
);
970 int for_each_ref_in(const char *prefix
, each_ref_fn fn
, void *cb_data
)
972 return do_for_each_ref(NULL
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
975 int for_each_ref_in_submodule(const char *submodule
, const char *prefix
,
976 each_ref_fn fn
, void *cb_data
)
978 return do_for_each_ref(submodule
, prefix
, fn
, strlen(prefix
), 0, cb_data
);
981 int for_each_tag_ref(each_ref_fn fn
, void *cb_data
)
983 return for_each_ref_in("refs/tags/", fn
, cb_data
);
986 int for_each_tag_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
988 return for_each_ref_in_submodule(submodule
, "refs/tags/", fn
, cb_data
);
991 int for_each_branch_ref(each_ref_fn fn
, void *cb_data
)
993 return for_each_ref_in("refs/heads/", fn
, cb_data
);
996 int for_each_branch_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
998 return for_each_ref_in_submodule(submodule
, "refs/heads/", fn
, cb_data
);
1001 int for_each_remote_ref(each_ref_fn fn
, void *cb_data
)
1003 return for_each_ref_in("refs/remotes/", fn
, cb_data
);
1006 int for_each_remote_ref_submodule(const char *submodule
, each_ref_fn fn
, void *cb_data
)
1008 return for_each_ref_in_submodule(submodule
, "refs/remotes/", fn
, cb_data
);
1011 int for_each_replace_ref(each_ref_fn fn
, void *cb_data
)
1013 return do_for_each_ref(NULL
, "refs/replace/", fn
, 13, 0, cb_data
);
1016 int head_ref_namespaced(each_ref_fn fn
, void *cb_data
)
1018 struct strbuf buf
= STRBUF_INIT
;
1020 unsigned char sha1
[20];
1023 strbuf_addf(&buf
, "%sHEAD", get_git_namespace());
1024 if (!read_ref_full(buf
.buf
, sha1
, 1, &flag
))
1025 ret
= fn(buf
.buf
, sha1
, flag
, cb_data
);
1026 strbuf_release(&buf
);
1031 int for_each_namespaced_ref(each_ref_fn fn
, void *cb_data
)
1033 struct strbuf buf
= STRBUF_INIT
;
1035 strbuf_addf(&buf
, "%srefs/", get_git_namespace());
1036 ret
= do_for_each_ref(NULL
, buf
.buf
, fn
, 0, 0, cb_data
);
1037 strbuf_release(&buf
);
1041 int for_each_glob_ref_in(each_ref_fn fn
, const char *pattern
,
1042 const char *prefix
, void *cb_data
)
1044 struct strbuf real_pattern
= STRBUF_INIT
;
1045 struct ref_filter filter
;
1048 if (!prefix
&& prefixcmp(pattern
, "refs/"))
1049 strbuf_addstr(&real_pattern
, "refs/");
1051 strbuf_addstr(&real_pattern
, prefix
);
1052 strbuf_addstr(&real_pattern
, pattern
);
1054 if (!has_glob_specials(pattern
)) {
1055 /* Append implied '/' '*' if not present. */
1056 if (real_pattern
.buf
[real_pattern
.len
- 1] != '/')
1057 strbuf_addch(&real_pattern
, '/');
1058 /* No need to check for '*', there is none. */
1059 strbuf_addch(&real_pattern
, '*');
1062 filter
.pattern
= real_pattern
.buf
;
1064 filter
.cb_data
= cb_data
;
1065 ret
= for_each_ref(filter_refs
, &filter
);
1067 strbuf_release(&real_pattern
);
1071 int for_each_glob_ref(each_ref_fn fn
, const char *pattern
, void *cb_data
)
1073 return for_each_glob_ref_in(fn
, pattern
, NULL
, cb_data
);
1076 int for_each_rawref(each_ref_fn fn
, void *cb_data
)
1078 return do_for_each_ref(NULL
, "", fn
, 0,
1079 DO_FOR_EACH_INCLUDE_BROKEN
, cb_data
);
1082 const char *prettify_refname(const char *name
)
1085 !prefixcmp(name
, "refs/heads/") ? 11 :
1086 !prefixcmp(name
, "refs/tags/") ? 10 :
1087 !prefixcmp(name
, "refs/remotes/") ? 13 :
1091 const char *ref_rev_parse_rules
[] = {
1096 "refs/remotes/%.*s",
1097 "refs/remotes/%.*s/HEAD",
1101 int refname_match(const char *abbrev_name
, const char *full_name
, const char **rules
)
1104 const int abbrev_name_len
= strlen(abbrev_name
);
1106 for (p
= rules
; *p
; p
++) {
1107 if (!strcmp(full_name
, mkpath(*p
, abbrev_name_len
, abbrev_name
))) {
1115 static struct ref_lock
*verify_lock(struct ref_lock
*lock
,
1116 const unsigned char *old_sha1
, int mustexist
)
1118 if (read_ref_full(lock
->ref_name
, lock
->old_sha1
, mustexist
, NULL
)) {
1119 error("Can't verify ref %s", lock
->ref_name
);
1123 if (hashcmp(lock
->old_sha1
, old_sha1
)) {
1124 error("Ref %s is at %s but expected %s", lock
->ref_name
,
1125 sha1_to_hex(lock
->old_sha1
), sha1_to_hex(old_sha1
));
1132 static int remove_empty_directories(const char *file
)
1134 /* we want to create a file but there is a directory there;
1135 * if that is an empty directory (or a directory that contains
1136 * only empty directories), remove them.
1141 strbuf_init(&path
, 20);
1142 strbuf_addstr(&path
, file
);
1144 result
= remove_dir_recursively(&path
, REMOVE_DIR_EMPTY_ONLY
);
1146 strbuf_release(&path
);
1152 * *string and *len will only be substituted, and *string returned (for
1153 * later free()ing) if the string passed in is a magic short-hand form
1156 static char *substitute_branch_name(const char **string
, int *len
)
1158 struct strbuf buf
= STRBUF_INIT
;
1159 int ret
= interpret_branch_name(*string
, &buf
);
1163 *string
= strbuf_detach(&buf
, &size
);
1165 return (char *)*string
;
1171 int dwim_ref(const char *str
, int len
, unsigned char *sha1
, char **ref
)
1173 char *last_branch
= substitute_branch_name(&str
, &len
);
1178 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1179 char fullref
[PATH_MAX
];
1180 unsigned char sha1_from_ref
[20];
1181 unsigned char *this_result
;
1184 this_result
= refs_found
? sha1_from_ref
: sha1
;
1185 mksnpath(fullref
, sizeof(fullref
), *p
, len
, str
);
1186 r
= resolve_ref_unsafe(fullref
, this_result
, 1, &flag
);
1190 if (!warn_ambiguous_refs
)
1192 } else if ((flag
& REF_ISSYMREF
) && strcmp(fullref
, "HEAD")) {
1193 warning("ignoring dangling symref %s.", fullref
);
1194 } else if ((flag
& REF_ISBROKEN
) && strchr(fullref
, '/')) {
1195 warning("ignoring broken ref %s.", fullref
);
1202 int dwim_log(const char *str
, int len
, unsigned char *sha1
, char **log
)
1204 char *last_branch
= substitute_branch_name(&str
, &len
);
1209 for (p
= ref_rev_parse_rules
; *p
; p
++) {
1211 unsigned char hash
[20];
1212 char path
[PATH_MAX
];
1213 const char *ref
, *it
;
1215 mksnpath(path
, sizeof(path
), *p
, len
, str
);
1216 ref
= resolve_ref_unsafe(path
, hash
, 1, NULL
);
1219 if (!stat(git_path("logs/%s", path
), &st
) &&
1220 S_ISREG(st
.st_mode
))
1222 else if (strcmp(ref
, path
) &&
1223 !stat(git_path("logs/%s", ref
), &st
) &&
1224 S_ISREG(st
.st_mode
))
1228 if (!logs_found
++) {
1230 hashcpy(sha1
, hash
);
1232 if (!warn_ambiguous_refs
)
1239 static struct ref_lock
*lock_ref_sha1_basic(const char *refname
,
1240 const unsigned char *old_sha1
,
1241 int flags
, int *type_p
)
1244 const char *orig_refname
= refname
;
1245 struct ref_lock
*lock
;
1248 int mustexist
= (old_sha1
&& !is_null_sha1(old_sha1
));
1251 lock
= xcalloc(1, sizeof(struct ref_lock
));
1254 refname
= resolve_ref_unsafe(refname
, lock
->old_sha1
, mustexist
, &type
);
1255 if (!refname
&& errno
== EISDIR
) {
1256 /* we are trying to lock foo but we used to
1257 * have foo/bar which now does not exist;
1258 * it is normal for the empty directory 'foo'
1261 ref_file
= git_path("%s", orig_refname
);
1262 if (remove_empty_directories(ref_file
)) {
1264 error("there are still refs under '%s'", orig_refname
);
1267 refname
= resolve_ref_unsafe(orig_refname
, lock
->old_sha1
, mustexist
, &type
);
1273 error("unable to resolve reference %s: %s",
1274 orig_refname
, strerror(errno
));
1277 missing
= is_null_sha1(lock
->old_sha1
);
1278 /* When the ref did not exist and we are creating it,
1279 * make sure there is no existing ref that is packed
1280 * whose name begins with our refname, nor a ref whose
1281 * name is a proper prefix of our refname.
1284 !is_refname_available(refname
, NULL
, get_packed_refs(get_ref_cache(NULL
)))) {
1285 last_errno
= ENOTDIR
;
1289 lock
->lk
= xcalloc(1, sizeof(struct lock_file
));
1291 lflags
= LOCK_DIE_ON_ERROR
;
1292 if (flags
& REF_NODEREF
) {
1293 refname
= orig_refname
;
1294 lflags
|= LOCK_NODEREF
;
1296 lock
->ref_name
= xstrdup(refname
);
1297 lock
->orig_ref_name
= xstrdup(orig_refname
);
1298 ref_file
= git_path("%s", refname
);
1300 lock
->force_write
= 1;
1301 if ((flags
& REF_NODEREF
) && (type
& REF_ISSYMREF
))
1302 lock
->force_write
= 1;
1304 if (safe_create_leading_directories(ref_file
)) {
1306 error("unable to create directory for %s", ref_file
);
1310 lock
->lock_fd
= hold_lock_file_for_update(lock
->lk
, ref_file
, lflags
);
1311 return old_sha1
? verify_lock(lock
, old_sha1
, mustexist
) : lock
;
1319 struct ref_lock
*lock_ref_sha1(const char *refname
, const unsigned char *old_sha1
)
1321 char refpath
[PATH_MAX
];
1322 if (check_refname_format(refname
, 0))
1324 strcpy(refpath
, mkpath("refs/%s", refname
));
1325 return lock_ref_sha1_basic(refpath
, old_sha1
, 0, NULL
);
1328 struct ref_lock
*lock_any_ref_for_update(const char *refname
,
1329 const unsigned char *old_sha1
, int flags
)
1331 if (check_refname_format(refname
, REFNAME_ALLOW_ONELEVEL
))
1333 return lock_ref_sha1_basic(refname
, old_sha1
, flags
, NULL
);
1336 static struct lock_file packlock
;
1338 static int repack_without_ref(const char *refname
)
1340 struct ref_array
*packed
;
1343 packed
= get_packed_refs(get_ref_cache(NULL
));
1344 if (search_ref_array(packed
, refname
) == NULL
)
1346 fd
= hold_lock_file_for_update(&packlock
, git_path("packed-refs"), 0);
1348 unable_to_lock_error(git_path("packed-refs"), errno
);
1349 return error("cannot delete '%s' from packed refs", refname
);
1352 for (i
= 0; i
< packed
->nr
; i
++) {
1353 char line
[PATH_MAX
+ 100];
1355 struct ref_entry
*ref
= packed
->refs
[i
];
1357 if (!strcmp(refname
, ref
->name
))
1359 len
= snprintf(line
, sizeof(line
), "%s %s\n",
1360 sha1_to_hex(ref
->sha1
), ref
->name
);
1361 /* this should not happen but just being defensive */
1362 if (len
> sizeof(line
))
1363 die("too long a refname '%s'", ref
->name
);
1364 write_or_die(fd
, line
, len
);
1366 return commit_lock_file(&packlock
);
1369 int delete_ref(const char *refname
, const unsigned char *sha1
, int delopt
)
1371 struct ref_lock
*lock
;
1372 int err
, i
= 0, ret
= 0, flag
= 0;
1374 lock
= lock_ref_sha1_basic(refname
, sha1
, 0, &flag
);
1377 if (!(flag
& REF_ISPACKED
) || flag
& REF_ISSYMREF
) {
1381 if (!(delopt
& REF_NODEREF
)) {
1382 i
= strlen(lock
->lk
->filename
) - 5; /* .lock */
1383 lock
->lk
->filename
[i
] = 0;
1384 path
= lock
->lk
->filename
;
1386 path
= git_path("%s", refname
);
1388 err
= unlink_or_warn(path
);
1389 if (err
&& errno
!= ENOENT
)
1392 if (!(delopt
& REF_NODEREF
))
1393 lock
->lk
->filename
[i
] = '.';
1395 /* removing the loose one could have resurrected an earlier
1396 * packed one. Also, if it was not loose we need to repack
1399 ret
|= repack_without_ref(refname
);
1401 unlink_or_warn(git_path("logs/%s", lock
->ref_name
));
1402 invalidate_ref_cache(NULL
);
1408 * People using contrib's git-new-workdir have .git/logs/refs ->
1409 * /some/other/path/.git/logs/refs, and that may live on another device.
1411 * IOW, to avoid cross device rename errors, the temporary renamed log must
1412 * live into logs/refs.
1414 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1416 int rename_ref(const char *oldrefname
, const char *newrefname
, const char *logmsg
)
1418 unsigned char sha1
[20], orig_sha1
[20];
1419 int flag
= 0, logmoved
= 0;
1420 struct ref_lock
*lock
;
1421 struct stat loginfo
;
1422 int log
= !lstat(git_path("logs/%s", oldrefname
), &loginfo
);
1423 const char *symref
= NULL
;
1424 struct ref_cache
*refs
= get_ref_cache(NULL
);
1426 if (log
&& S_ISLNK(loginfo
.st_mode
))
1427 return error("reflog for %s is a symlink", oldrefname
);
1429 symref
= resolve_ref_unsafe(oldrefname
, orig_sha1
, 1, &flag
);
1430 if (flag
& REF_ISSYMREF
)
1431 return error("refname %s is a symbolic ref, renaming it is not supported",
1434 return error("refname %s not found", oldrefname
);
1436 if (!is_refname_available(newrefname
, oldrefname
, get_packed_refs(refs
)))
1439 if (!is_refname_available(newrefname
, oldrefname
, get_loose_refs(refs
)))
1442 if (log
&& rename(git_path("logs/%s", oldrefname
), git_path(TMP_RENAMED_LOG
)))
1443 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG
": %s",
1444 oldrefname
, strerror(errno
));
1446 if (delete_ref(oldrefname
, orig_sha1
, REF_NODEREF
)) {
1447 error("unable to delete old %s", oldrefname
);
1451 if (!read_ref_full(newrefname
, sha1
, 1, &flag
) &&
1452 delete_ref(newrefname
, sha1
, REF_NODEREF
)) {
1453 if (errno
==EISDIR
) {
1454 if (remove_empty_directories(git_path("%s", newrefname
))) {
1455 error("Directory not empty: %s", newrefname
);
1459 error("unable to delete existing %s", newrefname
);
1464 if (log
&& safe_create_leading_directories(git_path("logs/%s", newrefname
))) {
1465 error("unable to create directory for %s", newrefname
);
1470 if (log
&& rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", newrefname
))) {
1471 if (errno
==EISDIR
|| errno
==ENOTDIR
) {
1473 * rename(a, b) when b is an existing
1474 * directory ought to result in ISDIR, but
1475 * Solaris 5.8 gives ENOTDIR. Sheesh.
1477 if (remove_empty_directories(git_path("logs/%s", newrefname
))) {
1478 error("Directory not empty: logs/%s", newrefname
);
1483 error("unable to move logfile "TMP_RENAMED_LOG
" to logs/%s: %s",
1484 newrefname
, strerror(errno
));
1490 lock
= lock_ref_sha1_basic(newrefname
, NULL
, 0, NULL
);
1492 error("unable to lock %s for update", newrefname
);
1495 lock
->force_write
= 1;
1496 hashcpy(lock
->old_sha1
, orig_sha1
);
1497 if (write_ref_sha1(lock
, orig_sha1
, logmsg
)) {
1498 error("unable to write current sha1 into %s", newrefname
);
1505 lock
= lock_ref_sha1_basic(oldrefname
, NULL
, 0, NULL
);
1507 error("unable to lock %s for rollback", oldrefname
);
1511 lock
->force_write
= 1;
1512 flag
= log_all_ref_updates
;
1513 log_all_ref_updates
= 0;
1514 if (write_ref_sha1(lock
, orig_sha1
, NULL
))
1515 error("unable to write current sha1 into %s", oldrefname
);
1516 log_all_ref_updates
= flag
;
1519 if (logmoved
&& rename(git_path("logs/%s", newrefname
), git_path("logs/%s", oldrefname
)))
1520 error("unable to restore logfile %s from %s: %s",
1521 oldrefname
, newrefname
, strerror(errno
));
1522 if (!logmoved
&& log
&&
1523 rename(git_path(TMP_RENAMED_LOG
), git_path("logs/%s", oldrefname
)))
1524 error("unable to restore logfile %s from "TMP_RENAMED_LOG
": %s",
1525 oldrefname
, strerror(errno
));
1530 int close_ref(struct ref_lock
*lock
)
1532 if (close_lock_file(lock
->lk
))
1538 int commit_ref(struct ref_lock
*lock
)
1540 if (commit_lock_file(lock
->lk
))
1546 void unlock_ref(struct ref_lock
*lock
)
1548 /* Do not free lock->lk -- atexit() still looks at them */
1550 rollback_lock_file(lock
->lk
);
1551 free(lock
->ref_name
);
1552 free(lock
->orig_ref_name
);
1557 * copy the reflog message msg to buf, which has been allocated sufficiently
1558 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1559 * because reflog file is one line per entry.
1561 static int copy_msg(char *buf
, const char *msg
)
1568 while ((c
= *msg
++)) {
1569 if (wasspace
&& isspace(c
))
1571 wasspace
= isspace(c
);
1576 while (buf
< cp
&& isspace(cp
[-1]))
1582 int log_ref_setup(const char *refname
, char *logfile
, int bufsize
)
1584 int logfd
, oflags
= O_APPEND
| O_WRONLY
;
1586 git_snpath(logfile
, bufsize
, "logs/%s", refname
);
1587 if (log_all_ref_updates
&&
1588 (!prefixcmp(refname
, "refs/heads/") ||
1589 !prefixcmp(refname
, "refs/remotes/") ||
1590 !prefixcmp(refname
, "refs/notes/") ||
1591 !strcmp(refname
, "HEAD"))) {
1592 if (safe_create_leading_directories(logfile
) < 0)
1593 return error("unable to create directory for %s",
1598 logfd
= open(logfile
, oflags
, 0666);
1600 if (!(oflags
& O_CREAT
) && errno
== ENOENT
)
1603 if ((oflags
& O_CREAT
) && errno
== EISDIR
) {
1604 if (remove_empty_directories(logfile
)) {
1605 return error("There are still logs under '%s'",
1608 logfd
= open(logfile
, oflags
, 0666);
1612 return error("Unable to append to %s: %s",
1613 logfile
, strerror(errno
));
1616 adjust_shared_perm(logfile
);
1621 static int log_ref_write(const char *refname
, const unsigned char *old_sha1
,
1622 const unsigned char *new_sha1
, const char *msg
)
1624 int logfd
, result
, written
, oflags
= O_APPEND
| O_WRONLY
;
1625 unsigned maxlen
, len
;
1627 char log_file
[PATH_MAX
];
1629 const char *committer
;
1631 if (log_all_ref_updates
< 0)
1632 log_all_ref_updates
= !is_bare_repository();
1634 result
= log_ref_setup(refname
, log_file
, sizeof(log_file
));
1638 logfd
= open(log_file
, oflags
);
1641 msglen
= msg
? strlen(msg
) : 0;
1642 committer
= git_committer_info(0);
1643 maxlen
= strlen(committer
) + msglen
+ 100;
1644 logrec
= xmalloc(maxlen
);
1645 len
= sprintf(logrec
, "%s %s %s\n",
1646 sha1_to_hex(old_sha1
),
1647 sha1_to_hex(new_sha1
),
1650 len
+= copy_msg(logrec
+ len
- 1, msg
) - 1;
1651 written
= len
<= maxlen
? write_in_full(logfd
, logrec
, len
) : -1;
1653 if (close(logfd
) != 0 || written
!= len
)
1654 return error("Unable to append to %s", log_file
);
1658 static int is_branch(const char *refname
)
1660 return !strcmp(refname
, "HEAD") || !prefixcmp(refname
, "refs/heads/");
1663 int write_ref_sha1(struct ref_lock
*lock
,
1664 const unsigned char *sha1
, const char *logmsg
)
1666 static char term
= '\n';
1671 if (!lock
->force_write
&& !hashcmp(lock
->old_sha1
, sha1
)) {
1675 o
= parse_object(sha1
);
1677 error("Trying to write ref %s with nonexistent object %s",
1678 lock
->ref_name
, sha1_to_hex(sha1
));
1682 if (o
->type
!= OBJ_COMMIT
&& is_branch(lock
->ref_name
)) {
1683 error("Trying to write non-commit object %s to branch %s",
1684 sha1_to_hex(sha1
), lock
->ref_name
);
1688 if (write_in_full(lock
->lock_fd
, sha1_to_hex(sha1
), 40) != 40 ||
1689 write_in_full(lock
->lock_fd
, &term
, 1) != 1
1690 || close_ref(lock
) < 0) {
1691 error("Couldn't write %s", lock
->lk
->filename
);
1695 clear_loose_ref_cache(get_ref_cache(NULL
));
1696 if (log_ref_write(lock
->ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0 ||
1697 (strcmp(lock
->ref_name
, lock
->orig_ref_name
) &&
1698 log_ref_write(lock
->orig_ref_name
, lock
->old_sha1
, sha1
, logmsg
) < 0)) {
1702 if (strcmp(lock
->orig_ref_name
, "HEAD") != 0) {
1704 * Special hack: If a branch is updated directly and HEAD
1705 * points to it (may happen on the remote side of a push
1706 * for example) then logically the HEAD reflog should be
1708 * A generic solution implies reverse symref information,
1709 * but finding all symrefs pointing to the given branch
1710 * would be rather costly for this rare event (the direct
1711 * update of a branch) to be worth it. So let's cheat and
1712 * check with HEAD only which should cover 99% of all usage
1713 * scenarios (even 100% of the default ones).
1715 unsigned char head_sha1
[20];
1717 const char *head_ref
;
1718 head_ref
= resolve_ref_unsafe("HEAD", head_sha1
, 1, &head_flag
);
1719 if (head_ref
&& (head_flag
& REF_ISSYMREF
) &&
1720 !strcmp(head_ref
, lock
->ref_name
))
1721 log_ref_write("HEAD", lock
->old_sha1
, sha1
, logmsg
);
1723 if (commit_ref(lock
)) {
1724 error("Couldn't set %s", lock
->ref_name
);
1732 int create_symref(const char *ref_target
, const char *refs_heads_master
,
1735 const char *lockpath
;
1737 int fd
, len
, written
;
1738 char *git_HEAD
= git_pathdup("%s", ref_target
);
1739 unsigned char old_sha1
[20], new_sha1
[20];
1741 if (logmsg
&& read_ref(ref_target
, old_sha1
))
1744 if (safe_create_leading_directories(git_HEAD
) < 0)
1745 return error("unable to create directory for %s", git_HEAD
);
1747 #ifndef NO_SYMLINK_HEAD
1748 if (prefer_symlink_refs
) {
1750 if (!symlink(refs_heads_master
, git_HEAD
))
1752 fprintf(stderr
, "no symlink - falling back to symbolic ref\n");
1756 len
= snprintf(ref
, sizeof(ref
), "ref: %s\n", refs_heads_master
);
1757 if (sizeof(ref
) <= len
) {
1758 error("refname too long: %s", refs_heads_master
);
1759 goto error_free_return
;
1761 lockpath
= mkpath("%s.lock", git_HEAD
);
1762 fd
= open(lockpath
, O_CREAT
| O_EXCL
| O_WRONLY
, 0666);
1764 error("Unable to open %s for writing", lockpath
);
1765 goto error_free_return
;
1767 written
= write_in_full(fd
, ref
, len
);
1768 if (close(fd
) != 0 || written
!= len
) {
1769 error("Unable to write to %s", lockpath
);
1770 goto error_unlink_return
;
1772 if (rename(lockpath
, git_HEAD
) < 0) {
1773 error("Unable to create %s", git_HEAD
);
1774 goto error_unlink_return
;
1776 if (adjust_shared_perm(git_HEAD
)) {
1777 error("Unable to fix permissions on %s", lockpath
);
1778 error_unlink_return
:
1779 unlink_or_warn(lockpath
);
1785 #ifndef NO_SYMLINK_HEAD
1788 if (logmsg
&& !read_ref(refs_heads_master
, new_sha1
))
1789 log_ref_write(ref_target
, old_sha1
, new_sha1
, logmsg
);
1795 static char *ref_msg(const char *line
, const char *endp
)
1799 ep
= memchr(line
, '\n', endp
- line
);
1802 return xmemdupz(line
, ep
- line
);
1805 int read_ref_at(const char *refname
, unsigned long at_time
, int cnt
,
1806 unsigned char *sha1
, char **msg
,
1807 unsigned long *cutoff_time
, int *cutoff_tz
, int *cutoff_cnt
)
1809 const char *logfile
, *logdata
, *logend
, *rec
, *lastgt
, *lastrec
;
1811 int logfd
, tz
, reccnt
= 0;
1814 unsigned char logged_sha1
[20];
1818 logfile
= git_path("logs/%s", refname
);
1819 logfd
= open(logfile
, O_RDONLY
, 0);
1821 die_errno("Unable to read log '%s'", logfile
);
1824 die("Log %s is empty.", logfile
);
1825 mapsz
= xsize_t(st
.st_size
);
1826 log_mapped
= xmmap(NULL
, mapsz
, PROT_READ
, MAP_PRIVATE
, logfd
, 0);
1827 logdata
= log_mapped
;
1831 rec
= logend
= logdata
+ st
.st_size
;
1832 while (logdata
< rec
) {
1834 if (logdata
< rec
&& *(rec
-1) == '\n')
1837 while (logdata
< rec
&& *(rec
-1) != '\n') {
1843 die("Log %s is corrupt.", logfile
);
1844 date
= strtoul(lastgt
+ 1, &tz_c
, 10);
1845 if (date
<= at_time
|| cnt
== 0) {
1846 tz
= strtoul(tz_c
, NULL
, 10);
1848 *msg
= ref_msg(rec
, logend
);
1850 *cutoff_time
= date
;
1854 *cutoff_cnt
= reccnt
- 1;
1856 if (get_sha1_hex(lastrec
, logged_sha1
))
1857 die("Log %s is corrupt.", logfile
);
1858 if (get_sha1_hex(rec
+ 41, sha1
))
1859 die("Log %s is corrupt.", logfile
);
1860 if (hashcmp(logged_sha1
, sha1
)) {
1861 warning("Log %s has gap after %s.",
1862 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1865 else if (date
== at_time
) {
1866 if (get_sha1_hex(rec
+ 41, sha1
))
1867 die("Log %s is corrupt.", logfile
);
1870 if (get_sha1_hex(rec
+ 41, logged_sha1
))
1871 die("Log %s is corrupt.", logfile
);
1872 if (hashcmp(logged_sha1
, sha1
)) {
1873 warning("Log %s unexpectedly ended on %s.",
1874 logfile
, show_date(date
, tz
, DATE_RFC2822
));
1877 munmap(log_mapped
, mapsz
);
1886 while (rec
< logend
&& *rec
!= '>' && *rec
!= '\n')
1888 if (rec
== logend
|| *rec
== '\n')
1889 die("Log %s is corrupt.", logfile
);
1890 date
= strtoul(rec
+ 1, &tz_c
, 10);
1891 tz
= strtoul(tz_c
, NULL
, 10);
1892 if (get_sha1_hex(logdata
, sha1
))
1893 die("Log %s is corrupt.", logfile
);
1894 if (is_null_sha1(sha1
)) {
1895 if (get_sha1_hex(logdata
+ 41, sha1
))
1896 die("Log %s is corrupt.", logfile
);
1899 *msg
= ref_msg(logdata
, logend
);
1900 munmap(log_mapped
, mapsz
);
1903 *cutoff_time
= date
;
1907 *cutoff_cnt
= reccnt
;
1911 int for_each_recent_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, long ofs
, void *cb_data
)
1913 const char *logfile
;
1915 struct strbuf sb
= STRBUF_INIT
;
1918 logfile
= git_path("logs/%s", refname
);
1919 logfp
= fopen(logfile
, "r");
1924 struct stat statbuf
;
1925 if (fstat(fileno(logfp
), &statbuf
) ||
1926 statbuf
.st_size
< ofs
||
1927 fseek(logfp
, -ofs
, SEEK_END
) ||
1928 strbuf_getwholeline(&sb
, logfp
, '\n')) {
1930 strbuf_release(&sb
);
1935 while (!strbuf_getwholeline(&sb
, logfp
, '\n')) {
1936 unsigned char osha1
[20], nsha1
[20];
1937 char *email_end
, *message
;
1938 unsigned long timestamp
;
1941 /* old SP new SP name <email> SP time TAB msg LF */
1942 if (sb
.len
< 83 || sb
.buf
[sb
.len
- 1] != '\n' ||
1943 get_sha1_hex(sb
.buf
, osha1
) || sb
.buf
[40] != ' ' ||
1944 get_sha1_hex(sb
.buf
+ 41, nsha1
) || sb
.buf
[81] != ' ' ||
1945 !(email_end
= strchr(sb
.buf
+ 82, '>')) ||
1946 email_end
[1] != ' ' ||
1947 !(timestamp
= strtoul(email_end
+ 2, &message
, 10)) ||
1948 !message
|| message
[0] != ' ' ||
1949 (message
[1] != '+' && message
[1] != '-') ||
1950 !isdigit(message
[2]) || !isdigit(message
[3]) ||
1951 !isdigit(message
[4]) || !isdigit(message
[5]))
1952 continue; /* corrupt? */
1953 email_end
[1] = '\0';
1954 tz
= strtol(message
+ 1, NULL
, 10);
1955 if (message
[6] != '\t')
1959 ret
= fn(osha1
, nsha1
, sb
.buf
+ 82, timestamp
, tz
, message
,
1965 strbuf_release(&sb
);
1969 int for_each_reflog_ent(const char *refname
, each_reflog_ent_fn fn
, void *cb_data
)
1971 return for_each_recent_reflog_ent(refname
, fn
, 0, cb_data
);
1974 static int do_for_each_reflog(const char *base
, each_ref_fn fn
, void *cb_data
)
1976 DIR *dir
= opendir(git_path("logs/%s", base
));
1981 int baselen
= strlen(base
);
1982 char *log
= xmalloc(baselen
+ 257);
1984 memcpy(log
, base
, baselen
);
1985 if (baselen
&& base
[baselen
-1] != '/')
1986 log
[baselen
++] = '/';
1988 while ((de
= readdir(dir
)) != NULL
) {
1992 if (de
->d_name
[0] == '.')
1994 namelen
= strlen(de
->d_name
);
1997 if (has_extension(de
->d_name
, ".lock"))
1999 memcpy(log
+ baselen
, de
->d_name
, namelen
+1);
2000 if (stat(git_path("logs/%s", log
), &st
) < 0)
2002 if (S_ISDIR(st
.st_mode
)) {
2003 retval
= do_for_each_reflog(log
, fn
, cb_data
);
2005 unsigned char sha1
[20];
2006 if (read_ref_full(log
, sha1
, 0, NULL
))
2007 retval
= error("bad ref for %s", log
);
2009 retval
= fn(log
, sha1
, 0, cb_data
);
2022 int for_each_reflog(each_ref_fn fn
, void *cb_data
)
2024 return do_for_each_reflog("", fn
, cb_data
);
2027 int update_ref(const char *action
, const char *refname
,
2028 const unsigned char *sha1
, const unsigned char *oldval
,
2029 int flags
, enum action_on_err onerr
)
2031 static struct ref_lock
*lock
;
2032 lock
= lock_any_ref_for_update(refname
, oldval
, flags
);
2034 const char *str
= "Cannot lock the ref '%s'.";
2036 case MSG_ON_ERR
: error(str
, refname
); break;
2037 case DIE_ON_ERR
: die(str
, refname
); break;
2038 case QUIET_ON_ERR
: break;
2042 if (write_ref_sha1(lock
, sha1
, action
) < 0) {
2043 const char *str
= "Cannot update the ref '%s'.";
2045 case MSG_ON_ERR
: error(str
, refname
); break;
2046 case DIE_ON_ERR
: die(str
, refname
); break;
2047 case QUIET_ON_ERR
: break;
2054 struct ref
*find_ref_by_name(const struct ref
*list
, const char *name
)
2056 for ( ; list
; list
= list
->next
)
2057 if (!strcmp(list
->name
, name
))
2058 return (struct ref
*)list
;
2063 * generate a format suitable for scanf from a ref_rev_parse_rules
2064 * rule, that is replace the "%.*s" spec with a "%s" spec
2066 static void gen_scanf_fmt(char *scanf_fmt
, const char *rule
)
2070 spec
= strstr(rule
, "%.*s");
2071 if (!spec
|| strstr(spec
+ 4, "%.*s"))
2072 die("invalid rule in ref_rev_parse_rules: %s", rule
);
2074 /* copy all until spec */
2075 strncpy(scanf_fmt
, rule
, spec
- rule
);
2076 scanf_fmt
[spec
- rule
] = '\0';
2078 strcat(scanf_fmt
, "%s");
2079 /* copy remaining rule */
2080 strcat(scanf_fmt
, spec
+ 4);
2085 char *shorten_unambiguous_ref(const char *refname
, int strict
)
2088 static char **scanf_fmts
;
2089 static int nr_rules
;
2092 /* pre generate scanf formats from ref_rev_parse_rules[] */
2094 size_t total_len
= 0;
2096 /* the rule list is NULL terminated, count them first */
2097 for (; ref_rev_parse_rules
[nr_rules
]; nr_rules
++)
2098 /* no +1 because strlen("%s") < strlen("%.*s") */
2099 total_len
+= strlen(ref_rev_parse_rules
[nr_rules
]);
2101 scanf_fmts
= xmalloc(nr_rules
* sizeof(char *) + total_len
);
2104 for (i
= 0; i
< nr_rules
; i
++) {
2105 scanf_fmts
[i
] = (char *)&scanf_fmts
[nr_rules
]
2107 gen_scanf_fmt(scanf_fmts
[i
], ref_rev_parse_rules
[i
]);
2108 total_len
+= strlen(ref_rev_parse_rules
[i
]);
2112 /* bail out if there are no rules */
2114 return xstrdup(refname
);
2116 /* buffer for scanf result, at most refname must fit */
2117 short_name
= xstrdup(refname
);
2119 /* skip first rule, it will always match */
2120 for (i
= nr_rules
- 1; i
> 0 ; --i
) {
2122 int rules_to_fail
= i
;
2125 if (1 != sscanf(refname
, scanf_fmts
[i
], short_name
))
2128 short_name_len
= strlen(short_name
);
2131 * in strict mode, all (except the matched one) rules
2132 * must fail to resolve to a valid non-ambiguous ref
2135 rules_to_fail
= nr_rules
;
2138 * check if the short name resolves to a valid ref,
2139 * but use only rules prior to the matched one
2141 for (j
= 0; j
< rules_to_fail
; j
++) {
2142 const char *rule
= ref_rev_parse_rules
[j
];
2143 char refname
[PATH_MAX
];
2145 /* skip matched rule */
2150 * the short name is ambiguous, if it resolves
2151 * (with this previous rule) to a valid ref
2152 * read_ref() returns 0 on success
2154 mksnpath(refname
, sizeof(refname
),
2155 rule
, short_name_len
, short_name
);
2156 if (ref_exists(refname
))
2161 * short name is non-ambiguous if all previous rules
2162 * haven't resolved to a valid ref
2164 if (j
== rules_to_fail
)
2169 return xstrdup(refname
);