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);