7 /* ISSYMREF=01 and ISPACKED=02 are public interfaces */
8 #define REF_KNOWS_PEELED 04
12 struct ref_list *next;
13 unsigned char flag; /* ISSYMREF? ISPACKED? */
14 unsigned char sha1[20];
15 unsigned char peeled[20];
16 char name[FLEX_ARRAY];
19 static const char *parse_ref_line(char *line, unsigned char *sha1)
22 * 42: the answer to everything.
24 * In this case, it happens to be the answer to
25 * 40 (length of sha1 hex representation)
26 * +1 (space in between hex and name)
27 * +1 (newline at the end of the line)
29 int len = strlen(line) - 42;
33 if (get_sha1_hex(line, sha1) < 0)
35 if (!isspace(line[40]))
40 if (line[len] != '\n')
47 static struct ref_list *add_ref(const char *name, const unsigned char *sha1,
48 int flag, struct ref_list *list,
49 struct ref_list **new_entry)
52 struct ref_list *entry;
54 /* Allocate it and add it in.. */
55 len = strlen(name) + 1;
56 entry = xmalloc(sizeof(struct ref_list) + len);
57 hashcpy(entry->sha1, sha1);
58 hashclr(entry->peeled);
59 if (check_refname_format(name, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT))
60 die("Reference has invalid format: '%s'", name);
61 memcpy(entry->name, name, len);
69 /* merge sort the ref list */
70 static struct ref_list *sort_ref_list(struct ref_list *list)
72 int psize, qsize, last_merge_count, cmp;
73 struct ref_list *p, *q, *l, *e;
74 struct ref_list *new_list = list;
82 last_merge_count = merge_count;
95 while (psize < k && q->next) {
101 while ((psize > 0) || (qsize > 0 && q)) {
102 if (qsize == 0 || !q) {
106 } else if (psize == 0) {
111 cmp = strcmp(q->name, p->name);
116 } else if (cmp > 0) {
121 if (hashcmp(q->sha1, p->sha1))
122 die("Duplicated ref, and SHA1s don't match: %s",
124 warning("Duplicated ref: %s", q->name);
148 } while ((last_merge_count != merge_count) || (last_merge_count != 1));
154 * Future: need to be in "struct repository"
155 * when doing a full libification.
157 static struct cached_refs {
160 struct ref_list *loose;
161 struct ref_list *packed;
162 } cached_refs, submodule_refs;
163 static struct ref_list *current_ref;
165 static struct ref_list *extra_refs;
167 static void free_ref_list(struct ref_list *list)
169 struct ref_list *next;
170 for ( ; list; list = next) {
176 static void invalidate_cached_refs(void)
178 struct cached_refs *ca = &cached_refs;
180 if (ca->did_loose && ca->loose)
181 free_ref_list(ca->loose);
182 if (ca->did_packed && ca->packed)
183 free_ref_list(ca->packed);
184 ca->loose = ca->packed = NULL;
185 ca->did_loose = ca->did_packed = 0;
188 static void read_packed_refs(FILE *f, struct cached_refs *cached_refs)
190 struct ref_list *list = NULL;
191 struct ref_list *last = NULL;
192 char refline[PATH_MAX];
193 int flag = REF_ISPACKED;
195 while (fgets(refline, sizeof(refline), f)) {
196 unsigned char sha1[20];
198 static const char header[] = "# pack-refs with:";
200 if (!strncmp(refline, header, sizeof(header)-1)) {
201 const char *traits = refline + sizeof(header) - 1;
202 if (strstr(traits, " peeled "))
203 flag |= REF_KNOWS_PEELED;
204 /* perhaps other traits later as well */
208 name = parse_ref_line(refline, sha1);
210 list = add_ref(name, sha1, flag, list, &last);
215 strlen(refline) == 42 &&
216 refline[41] == '\n' &&
217 !get_sha1_hex(refline + 1, sha1))
218 hashcpy(last->peeled, sha1);
220 cached_refs->packed = sort_ref_list(list);
223 void add_extra_ref(const char *name, const unsigned char *sha1, int flag)
225 extra_refs = add_ref(name, sha1, flag, extra_refs, NULL);
228 void clear_extra_refs(void)
230 free_ref_list(extra_refs);
234 static struct ref_list *get_packed_refs(const char *submodule)
236 const char *packed_refs_file;
237 struct cached_refs *refs;
240 packed_refs_file = git_path_submodule(submodule, "packed-refs");
241 refs = &submodule_refs;
242 free_ref_list(refs->packed);
244 packed_refs_file = git_path("packed-refs");
248 if (!refs->did_packed || submodule) {
249 FILE *f = fopen(packed_refs_file, "r");
252 read_packed_refs(f, refs);
255 refs->did_packed = 1;
260 static struct ref_list *get_ref_dir(const char *submodule, const char *base,
261 struct ref_list *list)
267 path = git_path_submodule(submodule, "%s", base);
269 path = git_path("%s", base);
276 int baselen = strlen(base);
277 char *ref = xmalloc(baselen + 257);
279 memcpy(ref, base, baselen);
280 if (baselen && base[baselen-1] != '/')
281 ref[baselen++] = '/';
283 while ((de = readdir(dir)) != NULL) {
284 unsigned char sha1[20];
290 if (de->d_name[0] == '.')
292 namelen = strlen(de->d_name);
295 if (has_extension(de->d_name, ".lock"))
297 memcpy(ref + baselen, de->d_name, namelen+1);
299 ? git_path_submodule(submodule, "%s", ref)
300 : git_path("%s", ref);
301 if (stat(refdir, &st) < 0)
303 if (S_ISDIR(st.st_mode)) {
304 list = get_ref_dir(submodule, ref, list);
310 if (resolve_gitlink_ref(submodule, ref, sha1) < 0) {
315 if (!resolve_ref(ref, sha1, 1, &flag)) {
319 list = add_ref(ref, sha1, flag, list, NULL);
324 return sort_ref_list(list);
327 struct warn_if_dangling_data {
333 static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1,
334 int flags, void *cb_data)
336 struct warn_if_dangling_data *d = cb_data;
337 const char *resolves_to;
338 unsigned char junk[20];
340 if (!(flags & REF_ISSYMREF))
343 resolves_to = resolve_ref(refname, junk, 0, NULL);
344 if (!resolves_to || strcmp(resolves_to, d->refname))
347 fprintf(d->fp, d->msg_fmt, refname);
351 void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
353 struct warn_if_dangling_data data;
356 data.refname = refname;
357 data.msg_fmt = msg_fmt;
358 for_each_rawref(warn_if_dangling_symref, &data);
361 static struct ref_list *get_loose_refs(const char *submodule)
364 free_ref_list(submodule_refs.loose);
365 submodule_refs.loose = get_ref_dir(submodule, "refs", NULL);
366 return submodule_refs.loose;
369 if (!cached_refs.did_loose) {
370 cached_refs.loose = get_ref_dir(NULL, "refs", NULL);
371 cached_refs.did_loose = 1;
373 return cached_refs.loose;
376 /* We allow "recursive" symbolic refs. Only within reason, though */
378 #define MAXREFLEN (1024)
380 static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result)
383 struct cached_refs refs;
384 struct ref_list *ref;
387 strcpy(name + pathlen, "packed-refs");
388 f = fopen(name, "r");
391 read_packed_refs(f, &refs);
396 if (!strcmp(ref->name, refname)) {
398 memcpy(result, ref->sha1, 20);
403 free_ref_list(refs.packed);
407 static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion)
409 int fd, len = strlen(refname);
410 char buffer[128], *p;
412 if (recursion > MAXDEPTH || len > MAXREFLEN)
414 memcpy(name + pathlen, refname, len+1);
415 fd = open(name, O_RDONLY);
417 return resolve_gitlink_packed_ref(name, pathlen, refname, result);
419 len = read(fd, buffer, sizeof(buffer)-1);
423 while (len && isspace(buffer[len-1]))
427 /* Was it a detached head or an old-fashioned symlink? */
428 if (!get_sha1_hex(buffer, result))
432 if (strncmp(buffer, "ref:", 4))
438 return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1);
441 int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result)
443 int len = strlen(path), retval;
447 while (len && path[len-1] == '/')
451 gitdir = xmalloc(len + MAXREFLEN + 8);
452 memcpy(gitdir, path, len);
453 memcpy(gitdir + len, "/.git", 6);
456 tmp = read_gitfile(gitdir);
460 gitdir = xmalloc(len + MAXREFLEN + 3);
461 memcpy(gitdir, tmp, len);
464 gitdir[++len] = '\0';
465 retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0);
471 * Try to read ref from the packed references. On success, set sha1
472 * and return 0; otherwise, return -1.
474 static int get_packed_ref(const char *ref, unsigned char *sha1)
476 struct ref_list *list = get_packed_refs(NULL);
478 if (!strcmp(ref, list->name)) {
479 hashcpy(sha1, list->sha1);
487 const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
489 int depth = MAXDEPTH;
492 static char ref_buffer[256];
498 if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL))
509 git_snpath(path, sizeof(path), "%s", ref);
511 if (lstat(path, &st) < 0) {
515 * The loose reference file does not exist;
516 * check for a packed reference.
518 if (!get_packed_ref(ref, sha1)) {
520 *flag |= REF_ISPACKED;
523 /* The reference is not a packed reference, either. */
532 /* Follow "normalized" - ie "refs/.." symlinks by hand */
533 if (S_ISLNK(st.st_mode)) {
534 len = readlink(path, buffer, sizeof(buffer)-1);
538 if (!prefixcmp(buffer, "refs/") &&
539 !check_refname_format(buffer, 0)) {
540 strcpy(ref_buffer, buffer);
543 *flag |= REF_ISSYMREF;
548 /* Is it a directory? */
549 if (S_ISDIR(st.st_mode)) {
555 * Anything else, just open it and try to use it as
558 fd = open(path, O_RDONLY);
561 len = read_in_full(fd, buffer, sizeof(buffer)-1);
565 while (len && isspace(buffer[len-1]))
570 * Is it a symbolic ref?
572 if (prefixcmp(buffer, "ref:"))
575 while (isspace(*buf))
577 if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
578 warning("symbolic reference in %s is formatted incorrectly",
582 ref = strcpy(ref_buffer, buf);
584 *flag |= REF_ISSYMREF;
586 /* Please note that FETCH_HEAD has a second line containing other data. */
587 if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) {
588 warning("reference in %s is formatted incorrectly", path);
594 /* The argument to filter_refs */
601 int read_ref(const char *ref, unsigned char *sha1)
603 if (resolve_ref(ref, sha1, 1, NULL))
608 #define DO_FOR_EACH_INCLUDE_BROKEN 01
609 static int do_one_ref(const char *base, each_ref_fn fn, int trim,
610 int flags, void *cb_data, struct ref_list *entry)
612 if (prefixcmp(entry->name, base))
615 if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) {
616 if (entry->flag & REF_BROKEN)
617 return 0; /* ignore dangling symref */
618 if (!has_sha1_file(entry->sha1)) {
619 error("%s does not point to a valid object!", entry->name);
624 return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
627 static int filter_refs(const char *ref, const unsigned char *sha, int flags,
630 struct ref_filter *filter = (struct ref_filter *)data;
631 if (fnmatch(filter->pattern, ref, 0))
633 return filter->fn(ref, sha, flags, filter->cb_data);
636 int peel_ref(const char *ref, unsigned char *sha1)
639 unsigned char base[20];
642 if (current_ref && (current_ref->name == ref
643 || !strcmp(current_ref->name, ref))) {
644 if (current_ref->flag & REF_KNOWS_PEELED) {
645 hashcpy(sha1, current_ref->peeled);
648 hashcpy(base, current_ref->sha1);
652 if (!resolve_ref(ref, base, 1, &flag))
655 if ((flag & REF_ISPACKED)) {
656 struct ref_list *list = get_packed_refs(NULL);
659 if (!strcmp(list->name, ref)) {
660 if (list->flag & REF_KNOWS_PEELED) {
661 hashcpy(sha1, list->peeled);
664 /* older pack-refs did not leave peeled ones */
672 o = parse_object(base);
673 if (o && o->type == OBJ_TAG) {
674 o = deref_tag(o, ref, 0);
676 hashcpy(sha1, o->sha1);
683 static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn,
684 int trim, int flags, void *cb_data)
687 struct ref_list *packed = get_packed_refs(submodule);
688 struct ref_list *loose = get_loose_refs(submodule);
690 struct ref_list *extra;
692 for (extra = extra_refs; extra; extra = extra->next)
693 retval = do_one_ref(base, fn, trim, flags, cb_data, extra);
695 while (packed && loose) {
696 struct ref_list *entry;
697 int cmp = strcmp(packed->name, loose->name);
699 packed = packed->next;
707 packed = packed->next;
709 retval = do_one_ref(base, fn, trim, flags, cb_data, entry);
714 for (packed = packed ? packed : loose; packed; packed = packed->next) {
715 retval = do_one_ref(base, fn, trim, flags, cb_data, packed);
726 static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
728 unsigned char sha1[20];
732 if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0)
733 return fn("HEAD", sha1, 0, cb_data);
738 if (resolve_ref("HEAD", sha1, 1, &flag))
739 return fn("HEAD", sha1, flag, cb_data);
744 int head_ref(each_ref_fn fn, void *cb_data)
746 return do_head_ref(NULL, fn, cb_data);
749 int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
751 return do_head_ref(submodule, fn, cb_data);
754 int for_each_ref(each_ref_fn fn, void *cb_data)
756 return do_for_each_ref(NULL, "", fn, 0, 0, cb_data);
759 int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
761 return do_for_each_ref(submodule, "", fn, 0, 0, cb_data);
764 int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
766 return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data);
769 int for_each_ref_in_submodule(const char *submodule, const char *prefix,
770 each_ref_fn fn, void *cb_data)
772 return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data);
775 int for_each_tag_ref(each_ref_fn fn, void *cb_data)
777 return for_each_ref_in("refs/tags/", fn, cb_data);
780 int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
782 return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
785 int for_each_branch_ref(each_ref_fn fn, void *cb_data)
787 return for_each_ref_in("refs/heads/", fn, cb_data);
790 int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
792 return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
795 int for_each_remote_ref(each_ref_fn fn, void *cb_data)
797 return for_each_ref_in("refs/remotes/", fn, cb_data);
800 int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
802 return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
805 int for_each_replace_ref(each_ref_fn fn, void *cb_data)
807 return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data);
810 int head_ref_namespaced(each_ref_fn fn, void *cb_data)
812 struct strbuf buf = STRBUF_INIT;
814 unsigned char sha1[20];
817 strbuf_addf(&buf, "%sHEAD", get_git_namespace());
818 if (resolve_ref(buf.buf, sha1, 1, &flag))
819 ret = fn(buf.buf, sha1, flag, cb_data);
820 strbuf_release(&buf);
825 int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
827 struct strbuf buf = STRBUF_INIT;
829 strbuf_addf(&buf, "%srefs/", get_git_namespace());
830 ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data);
831 strbuf_release(&buf);
835 int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
836 const char *prefix, void *cb_data)
838 struct strbuf real_pattern = STRBUF_INIT;
839 struct ref_filter filter;
842 if (!prefix && prefixcmp(pattern, "refs/"))
843 strbuf_addstr(&real_pattern, "refs/");
845 strbuf_addstr(&real_pattern, prefix);
846 strbuf_addstr(&real_pattern, pattern);
848 if (!has_glob_specials(pattern)) {
849 /* Append implied '/' '*' if not present. */
850 if (real_pattern.buf[real_pattern.len - 1] != '/')
851 strbuf_addch(&real_pattern, '/');
852 /* No need to check for '*', there is none. */
853 strbuf_addch(&real_pattern, '*');
856 filter.pattern = real_pattern.buf;
858 filter.cb_data = cb_data;
859 ret = for_each_ref(filter_refs, &filter);
861 strbuf_release(&real_pattern);
865 int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
867 return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
870 int for_each_rawref(each_ref_fn fn, void *cb_data)
872 return do_for_each_ref(NULL, "", fn, 0,
873 DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
877 * Make sure "ref" is something reasonable to have under ".git/refs/";
878 * We do not like it if:
880 * - any path component of it begins with ".", or
881 * - it has double dots "..", or
882 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
883 * - it ends with a "/".
884 * - it ends with ".lock"
885 * - it contains a "\" (backslash)
888 /* Return true iff ch is not allowed in reference names. */
889 static inline int bad_ref_char(int ch)
891 if (((unsigned) ch) <= ' ' || ch == 0x7f ||
892 ch == '~' || ch == '^' || ch == ':' || ch == '\\')
894 /* 2.13 Pattern Matching Notation */
895 if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */
901 * Try to read one refname component from the front of ref. Return
902 * the length of the component found, or -1 if the component is not
905 static int check_refname_component(const char *ref, int flags)
910 for (cp = ref; ; cp++) {
912 if (ch == '\0' || ch == '/')
914 if (bad_ref_char(ch))
915 return -1; /* Illegal character in refname. */
916 if (last == '.' && ch == '.')
917 return -1; /* Refname contains "..". */
918 if (last == '@' && ch == '{')
919 return -1; /* Refname contains "@{". */
923 return -1; /* Component has zero length. */
925 if (!(flags & REFNAME_DOT_COMPONENT))
926 return -1; /* Component starts with '.'. */
928 * Even if leading dots are allowed, don't allow "."
929 * as a component (".." is prevented by a rule above).
932 return -1; /* Component equals ".". */
934 if (cp - ref >= 5 && !memcmp(cp - 5, ".lock", 5))
935 return -1; /* Refname ends with ".lock". */
939 int check_refname_format(const char *ref, int flags)
941 int component_len, component_count = 0;
944 /* We are at the start of a path component. */
945 component_len = check_refname_component(ref, flags);
946 if (component_len < 0) {
947 if ((flags & REFNAME_REFSPEC_PATTERN) &&
949 (ref[1] == '\0' || ref[1] == '/')) {
950 /* Accept one wildcard as a full refname component. */
951 flags &= ~REFNAME_REFSPEC_PATTERN;
958 if (ref[component_len] == '\0')
960 /* Skip to next component. */
961 ref += component_len + 1;
964 if (ref[component_len - 1] == '.')
965 return -1; /* Refname ends with '.'. */
966 if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2)
967 return -1; /* Refname has only one component. */
971 const char *prettify_refname(const char *name)
974 !prefixcmp(name, "refs/heads/") ? 11 :
975 !prefixcmp(name, "refs/tags/") ? 10 :
976 !prefixcmp(name, "refs/remotes/") ? 13 :
980 const char *ref_rev_parse_rules[] = {
986 "refs/remotes/%.*s/HEAD",
990 const char *ref_fetch_rules[] = {
997 int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
1000 const int abbrev_name_len = strlen(abbrev_name);
1002 for (p = rules; *p; p++) {
1003 if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
1011 static struct ref_lock *verify_lock(struct ref_lock *lock,
1012 const unsigned char *old_sha1, int mustexist)
1014 if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
1015 error("Can't verify ref %s", lock->ref_name);
1019 if (hashcmp(lock->old_sha1, old_sha1)) {
1020 error("Ref %s is at %s but expected %s", lock->ref_name,
1021 sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
1028 static int remove_empty_directories(const char *file)
1030 /* we want to create a file but there is a directory there;
1031 * if that is an empty directory (or a directory that contains
1032 * only empty directories), remove them.
1037 strbuf_init(&path, 20);
1038 strbuf_addstr(&path, file);
1040 result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY);
1042 strbuf_release(&path);
1047 static int is_refname_available(const char *ref, const char *oldref,
1048 struct ref_list *list, int quiet)
1050 int namlen = strlen(ref); /* e.g. 'foo/bar' */
1052 /* list->name could be 'foo' or 'foo/bar/baz' */
1053 if (!oldref || strcmp(oldref, list->name)) {
1054 int len = strlen(list->name);
1055 int cmplen = (namlen < len) ? namlen : len;
1056 const char *lead = (namlen < len) ? list->name : ref;
1057 if (!strncmp(ref, list->name, cmplen) &&
1058 lead[cmplen] == '/') {
1060 error("'%s' exists; cannot create '%s'",
1070 static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p)
1073 const char *orig_ref = ref;
1074 struct ref_lock *lock;
1077 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
1080 lock = xcalloc(1, sizeof(struct ref_lock));
1083 ref = resolve_ref(ref, lock->old_sha1, mustexist, &type);
1084 if (!ref && errno == EISDIR) {
1085 /* we are trying to lock foo but we used to
1086 * have foo/bar which now does not exist;
1087 * it is normal for the empty directory 'foo'
1090 ref_file = git_path("%s", orig_ref);
1091 if (remove_empty_directories(ref_file)) {
1093 error("there are still refs under '%s'", orig_ref);
1096 ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type);
1102 error("unable to resolve reference %s: %s",
1103 orig_ref, strerror(errno));
1106 missing = is_null_sha1(lock->old_sha1);
1107 /* When the ref did not exist and we are creating it,
1108 * make sure there is no existing ref that is packed
1109 * whose name begins with our refname, nor a ref whose
1110 * name is a proper prefix of our refname.
1113 !is_refname_available(ref, NULL, get_packed_refs(NULL), 0)) {
1114 last_errno = ENOTDIR;
1118 lock->lk = xcalloc(1, sizeof(struct lock_file));
1120 lflags = LOCK_DIE_ON_ERROR;
1121 if (flags & REF_NODEREF) {
1123 lflags |= LOCK_NODEREF;
1125 lock->ref_name = xstrdup(ref);
1126 lock->orig_ref_name = xstrdup(orig_ref);
1127 ref_file = git_path("%s", ref);
1129 lock->force_write = 1;
1130 if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
1131 lock->force_write = 1;
1133 if (safe_create_leading_directories(ref_file)) {
1135 error("unable to create directory for %s", ref_file);
1139 lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
1140 return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
1148 struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
1150 char refpath[PATH_MAX];
1151 if (check_refname_format(ref, 0))
1153 strcpy(refpath, mkpath("refs/%s", ref));
1154 return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
1157 struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags)
1159 if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL))
1161 return lock_ref_sha1_basic(ref, old_sha1, flags, NULL);
1164 static struct lock_file packlock;
1166 static int repack_without_ref(const char *refname)
1168 struct ref_list *list, *packed_ref_list;
1172 packed_ref_list = get_packed_refs(NULL);
1173 for (list = packed_ref_list; list; list = list->next) {
1174 if (!strcmp(refname, list->name)) {
1181 fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
1183 unable_to_lock_error(git_path("packed-refs"), errno);
1184 return error("cannot delete '%s' from packed refs", refname);
1187 for (list = packed_ref_list; list; list = list->next) {
1188 char line[PATH_MAX + 100];
1191 if (!strcmp(refname, list->name))
1193 len = snprintf(line, sizeof(line), "%s %s\n",
1194 sha1_to_hex(list->sha1), list->name);
1195 /* this should not happen but just being defensive */
1196 if (len > sizeof(line))
1197 die("too long a refname '%s'", list->name);
1198 write_or_die(fd, line, len);
1200 return commit_lock_file(&packlock);
1203 int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
1205 struct ref_lock *lock;
1206 int err, i = 0, ret = 0, flag = 0;
1208 lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
1211 if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
1215 if (!(delopt & REF_NODEREF)) {
1216 i = strlen(lock->lk->filename) - 5; /* .lock */
1217 lock->lk->filename[i] = 0;
1218 path = lock->lk->filename;
1220 path = git_path("%s", refname);
1222 err = unlink_or_warn(path);
1223 if (err && errno != ENOENT)
1226 if (!(delopt & REF_NODEREF))
1227 lock->lk->filename[i] = '.';
1229 /* removing the loose one could have resurrected an earlier
1230 * packed one. Also, if it was not loose we need to repack
1233 ret |= repack_without_ref(refname);
1235 unlink_or_warn(git_path("logs/%s", lock->ref_name));
1236 invalidate_cached_refs();
1242 * People using contrib's git-new-workdir have .git/logs/refs ->
1243 * /some/other/path/.git/logs/refs, and that may live on another device.
1245 * IOW, to avoid cross device rename errors, the temporary renamed log must
1246 * live into logs/refs.
1248 #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1250 int rename_ref(const char *oldref, const char *newref, const char *logmsg)
1252 static const char renamed_ref[] = "RENAMED-REF";
1253 unsigned char sha1[20], orig_sha1[20];
1254 int flag = 0, logmoved = 0;
1255 struct ref_lock *lock;
1256 struct stat loginfo;
1257 int log = !lstat(git_path("logs/%s", oldref), &loginfo);
1258 const char *symref = NULL;
1260 if (log && S_ISLNK(loginfo.st_mode))
1261 return error("reflog for %s is a symlink", oldref);
1263 symref = resolve_ref(oldref, orig_sha1, 1, &flag);
1264 if (flag & REF_ISSYMREF)
1265 return error("refname %s is a symbolic ref, renaming it is not supported",
1268 return error("refname %s not found", oldref);
1270 if (!is_refname_available(newref, oldref, get_packed_refs(NULL), 0))
1273 if (!is_refname_available(newref, oldref, get_loose_refs(NULL), 0))
1276 lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL);
1278 return error("unable to lock %s", renamed_ref);
1279 lock->force_write = 1;
1280 if (write_ref_sha1(lock, orig_sha1, logmsg))
1281 return error("unable to save current sha1 in %s", renamed_ref);
1283 if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG)))
1284 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
1285 oldref, strerror(errno));
1287 if (delete_ref(oldref, orig_sha1, REF_NODEREF)) {
1288 error("unable to delete old %s", oldref);
1292 if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) {
1293 if (errno==EISDIR) {
1294 if (remove_empty_directories(git_path("%s", newref))) {
1295 error("Directory not empty: %s", newref);
1299 error("unable to delete existing %s", newref);
1304 if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
1305 error("unable to create directory for %s", newref);
1310 if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newref))) {
1311 if (errno==EISDIR || errno==ENOTDIR) {
1313 * rename(a, b) when b is an existing
1314 * directory ought to result in ISDIR, but
1315 * Solaris 5.8 gives ENOTDIR. Sheesh.
1317 if (remove_empty_directories(git_path("logs/%s", newref))) {
1318 error("Directory not empty: logs/%s", newref);
1323 error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
1324 newref, strerror(errno));
1330 lock = lock_ref_sha1_basic(newref, NULL, 0, NULL);
1332 error("unable to lock %s for update", newref);
1335 lock->force_write = 1;
1336 hashcpy(lock->old_sha1, orig_sha1);
1337 if (write_ref_sha1(lock, orig_sha1, logmsg)) {
1338 error("unable to write current sha1 into %s", newref);
1345 lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL);
1347 error("unable to lock %s for rollback", oldref);
1351 lock->force_write = 1;
1352 flag = log_all_ref_updates;
1353 log_all_ref_updates = 0;
1354 if (write_ref_sha1(lock, orig_sha1, NULL))
1355 error("unable to write current sha1 into %s", oldref);
1356 log_all_ref_updates = flag;
1359 if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
1360 error("unable to restore logfile %s from %s: %s",
1361 oldref, newref, strerror(errno));
1362 if (!logmoved && log &&
1363 rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldref)))
1364 error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
1365 oldref, strerror(errno));
1370 int close_ref(struct ref_lock *lock)
1372 if (close_lock_file(lock->lk))
1378 int commit_ref(struct ref_lock *lock)
1380 if (commit_lock_file(lock->lk))
1386 void unlock_ref(struct ref_lock *lock)
1388 /* Do not free lock->lk -- atexit() still looks at them */
1390 rollback_lock_file(lock->lk);
1391 free(lock->ref_name);
1392 free(lock->orig_ref_name);
1397 * copy the reflog message msg to buf, which has been allocated sufficiently
1398 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1399 * because reflog file is one line per entry.
1401 static int copy_msg(char *buf, const char *msg)
1408 while ((c = *msg++)) {
1409 if (wasspace && isspace(c))
1411 wasspace = isspace(c);
1416 while (buf < cp && isspace(cp[-1]))
1422 int log_ref_setup(const char *ref_name, char *logfile, int bufsize)
1424 int logfd, oflags = O_APPEND | O_WRONLY;
1426 git_snpath(logfile, bufsize, "logs/%s", ref_name);
1427 if (log_all_ref_updates &&
1428 (!prefixcmp(ref_name, "refs/heads/") ||
1429 !prefixcmp(ref_name, "refs/remotes/") ||
1430 !prefixcmp(ref_name, "refs/notes/") ||
1431 !strcmp(ref_name, "HEAD"))) {
1432 if (safe_create_leading_directories(logfile) < 0)
1433 return error("unable to create directory for %s",
1438 logfd = open(logfile, oflags, 0666);
1440 if (!(oflags & O_CREAT) && errno == ENOENT)
1443 if ((oflags & O_CREAT) && errno == EISDIR) {
1444 if (remove_empty_directories(logfile)) {
1445 return error("There are still logs under '%s'",
1448 logfd = open(logfile, oflags, 0666);
1452 return error("Unable to append to %s: %s",
1453 logfile, strerror(errno));
1456 adjust_shared_perm(logfile);
1461 static int log_ref_write(const char *ref_name, const unsigned char *old_sha1,
1462 const unsigned char *new_sha1, const char *msg)
1464 int logfd, result, written, oflags = O_APPEND | O_WRONLY;
1465 unsigned maxlen, len;
1467 char log_file[PATH_MAX];
1469 const char *committer;
1471 if (log_all_ref_updates < 0)
1472 log_all_ref_updates = !is_bare_repository();
1474 result = log_ref_setup(ref_name, log_file, sizeof(log_file));
1478 logfd = open(log_file, oflags);
1481 msglen = msg ? strlen(msg) : 0;
1482 committer = git_committer_info(0);
1483 maxlen = strlen(committer) + msglen + 100;
1484 logrec = xmalloc(maxlen);
1485 len = sprintf(logrec, "%s %s %s\n",
1486 sha1_to_hex(old_sha1),
1487 sha1_to_hex(new_sha1),
1490 len += copy_msg(logrec + len - 1, msg) - 1;
1491 written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
1493 if (close(logfd) != 0 || written != len)
1494 return error("Unable to append to %s", log_file);
1498 static int is_branch(const char *refname)
1500 return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
1503 int write_ref_sha1(struct ref_lock *lock,
1504 const unsigned char *sha1, const char *logmsg)
1506 static char term = '\n';
1511 if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
1515 o = parse_object(sha1);
1517 error("Trying to write ref %s with nonexistent object %s",
1518 lock->ref_name, sha1_to_hex(sha1));
1522 if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
1523 error("Trying to write non-commit object %s to branch %s",
1524 sha1_to_hex(sha1), lock->ref_name);
1528 if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
1529 write_in_full(lock->lock_fd, &term, 1) != 1
1530 || close_ref(lock) < 0) {
1531 error("Couldn't write %s", lock->lk->filename);
1535 invalidate_cached_refs();
1536 if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
1537 (strcmp(lock->ref_name, lock->orig_ref_name) &&
1538 log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
1542 if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
1544 * Special hack: If a branch is updated directly and HEAD
1545 * points to it (may happen on the remote side of a push
1546 * for example) then logically the HEAD reflog should be
1548 * A generic solution implies reverse symref information,
1549 * but finding all symrefs pointing to the given branch
1550 * would be rather costly for this rare event (the direct
1551 * update of a branch) to be worth it. So let's cheat and
1552 * check with HEAD only which should cover 99% of all usage
1553 * scenarios (even 100% of the default ones).
1555 unsigned char head_sha1[20];
1557 const char *head_ref;
1558 head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag);
1559 if (head_ref && (head_flag & REF_ISSYMREF) &&
1560 !strcmp(head_ref, lock->ref_name))
1561 log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
1563 if (commit_ref(lock)) {
1564 error("Couldn't set %s", lock->ref_name);
1572 int create_symref(const char *ref_target, const char *refs_heads_master,
1575 const char *lockpath;
1577 int fd, len, written;
1578 char *git_HEAD = git_pathdup("%s", ref_target);
1579 unsigned char old_sha1[20], new_sha1[20];
1581 if (logmsg && read_ref(ref_target, old_sha1))
1584 if (safe_create_leading_directories(git_HEAD) < 0)
1585 return error("unable to create directory for %s", git_HEAD);
1587 #ifndef NO_SYMLINK_HEAD
1588 if (prefer_symlink_refs) {
1590 if (!symlink(refs_heads_master, git_HEAD))
1592 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
1596 len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
1597 if (sizeof(ref) <= len) {
1598 error("refname too long: %s", refs_heads_master);
1599 goto error_free_return;
1601 lockpath = mkpath("%s.lock", git_HEAD);
1602 fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
1604 error("Unable to open %s for writing", lockpath);
1605 goto error_free_return;
1607 written = write_in_full(fd, ref, len);
1608 if (close(fd) != 0 || written != len) {
1609 error("Unable to write to %s", lockpath);
1610 goto error_unlink_return;
1612 if (rename(lockpath, git_HEAD) < 0) {
1613 error("Unable to create %s", git_HEAD);
1614 goto error_unlink_return;
1616 if (adjust_shared_perm(git_HEAD)) {
1617 error("Unable to fix permissions on %s", lockpath);
1618 error_unlink_return:
1619 unlink_or_warn(lockpath);
1625 #ifndef NO_SYMLINK_HEAD
1628 if (logmsg && !read_ref(refs_heads_master, new_sha1))
1629 log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
1635 static char *ref_msg(const char *line, const char *endp)
1639 ep = memchr(line, '\n', endp - line);
1642 return xmemdupz(line, ep - line);
1645 int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *sha1, char **msg, unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
1647 const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
1649 int logfd, tz, reccnt = 0;
1652 unsigned char logged_sha1[20];
1656 logfile = git_path("logs/%s", ref);
1657 logfd = open(logfile, O_RDONLY, 0);
1659 die_errno("Unable to read log '%s'", logfile);
1662 die("Log %s is empty.", logfile);
1663 mapsz = xsize_t(st.st_size);
1664 log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
1665 logdata = log_mapped;
1669 rec = logend = logdata + st.st_size;
1670 while (logdata < rec) {
1672 if (logdata < rec && *(rec-1) == '\n')
1675 while (logdata < rec && *(rec-1) != '\n') {
1681 die("Log %s is corrupt.", logfile);
1682 date = strtoul(lastgt + 1, &tz_c, 10);
1683 if (date <= at_time || cnt == 0) {
1684 tz = strtoul(tz_c, NULL, 10);
1686 *msg = ref_msg(rec, logend);
1688 *cutoff_time = date;
1692 *cutoff_cnt = reccnt - 1;
1694 if (get_sha1_hex(lastrec, logged_sha1))
1695 die("Log %s is corrupt.", logfile);
1696 if (get_sha1_hex(rec + 41, sha1))
1697 die("Log %s is corrupt.", logfile);
1698 if (hashcmp(logged_sha1, sha1)) {
1699 warning("Log %s has gap after %s.",
1700 logfile, show_date(date, tz, DATE_RFC2822));
1703 else if (date == at_time) {
1704 if (get_sha1_hex(rec + 41, sha1))
1705 die("Log %s is corrupt.", logfile);
1708 if (get_sha1_hex(rec + 41, logged_sha1))
1709 die("Log %s is corrupt.", logfile);
1710 if (hashcmp(logged_sha1, sha1)) {
1711 warning("Log %s unexpectedly ended on %s.",
1712 logfile, show_date(date, tz, DATE_RFC2822));
1715 munmap(log_mapped, mapsz);
1724 while (rec < logend && *rec != '>' && *rec != '\n')
1726 if (rec == logend || *rec == '\n')
1727 die("Log %s is corrupt.", logfile);
1728 date = strtoul(rec + 1, &tz_c, 10);
1729 tz = strtoul(tz_c, NULL, 10);
1730 if (get_sha1_hex(logdata, sha1))
1731 die("Log %s is corrupt.", logfile);
1732 if (is_null_sha1(sha1)) {
1733 if (get_sha1_hex(logdata + 41, sha1))
1734 die("Log %s is corrupt.", logfile);
1737 *msg = ref_msg(logdata, logend);
1738 munmap(log_mapped, mapsz);
1741 *cutoff_time = date;
1745 *cutoff_cnt = reccnt;
1749 int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs, void *cb_data)
1751 const char *logfile;
1753 struct strbuf sb = STRBUF_INIT;
1756 logfile = git_path("logs/%s", ref);
1757 logfp = fopen(logfile, "r");
1762 struct stat statbuf;
1763 if (fstat(fileno(logfp), &statbuf) ||
1764 statbuf.st_size < ofs ||
1765 fseek(logfp, -ofs, SEEK_END) ||
1766 strbuf_getwholeline(&sb, logfp, '\n')) {
1768 strbuf_release(&sb);
1773 while (!strbuf_getwholeline(&sb, logfp, '\n')) {
1774 unsigned char osha1[20], nsha1[20];
1775 char *email_end, *message;
1776 unsigned long timestamp;
1779 /* old SP new SP name <email> SP time TAB msg LF */
1780 if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' ||
1781 get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' ||
1782 get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' ||
1783 !(email_end = strchr(sb.buf + 82, '>')) ||
1784 email_end[1] != ' ' ||
1785 !(timestamp = strtoul(email_end + 2, &message, 10)) ||
1786 !message || message[0] != ' ' ||
1787 (message[1] != '+' && message[1] != '-') ||
1788 !isdigit(message[2]) || !isdigit(message[3]) ||
1789 !isdigit(message[4]) || !isdigit(message[5]))
1790 continue; /* corrupt? */
1791 email_end[1] = '\0';
1792 tz = strtol(message + 1, NULL, 10);
1793 if (message[6] != '\t')
1797 ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message,
1803 strbuf_release(&sb);
1807 int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data)
1809 return for_each_recent_reflog_ent(ref, fn, 0, cb_data);
1812 static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data)
1814 DIR *dir = opendir(git_path("logs/%s", base));
1819 int baselen = strlen(base);
1820 char *log = xmalloc(baselen + 257);
1822 memcpy(log, base, baselen);
1823 if (baselen && base[baselen-1] != '/')
1824 log[baselen++] = '/';
1826 while ((de = readdir(dir)) != NULL) {
1830 if (de->d_name[0] == '.')
1832 namelen = strlen(de->d_name);
1835 if (has_extension(de->d_name, ".lock"))
1837 memcpy(log + baselen, de->d_name, namelen+1);
1838 if (stat(git_path("logs/%s", log), &st) < 0)
1840 if (S_ISDIR(st.st_mode)) {
1841 retval = do_for_each_reflog(log, fn, cb_data);
1843 unsigned char sha1[20];
1844 if (!resolve_ref(log, sha1, 0, NULL))
1845 retval = error("bad ref for %s", log);
1847 retval = fn(log, sha1, 0, cb_data);
1860 int for_each_reflog(each_ref_fn fn, void *cb_data)
1862 return do_for_each_reflog("", fn, cb_data);
1865 int update_ref(const char *action, const char *refname,
1866 const unsigned char *sha1, const unsigned char *oldval,
1867 int flags, enum action_on_err onerr)
1869 static struct ref_lock *lock;
1870 lock = lock_any_ref_for_update(refname, oldval, flags);
1872 const char *str = "Cannot lock the ref '%s'.";
1874 case MSG_ON_ERR: error(str, refname); break;
1875 case DIE_ON_ERR: die(str, refname); break;
1876 case QUIET_ON_ERR: break;
1880 if (write_ref_sha1(lock, sha1, action) < 0) {
1881 const char *str = "Cannot update the ref '%s'.";
1883 case MSG_ON_ERR: error(str, refname); break;
1884 case DIE_ON_ERR: die(str, refname); break;
1885 case QUIET_ON_ERR: break;
1892 int ref_exists(char *refname)
1894 unsigned char sha1[20];
1895 return !!resolve_ref(refname, sha1, 1, NULL);
1898 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1900 for ( ; list; list = list->next)
1901 if (!strcmp(list->name, name))
1902 return (struct ref *)list;
1907 * generate a format suitable for scanf from a ref_rev_parse_rules
1908 * rule, that is replace the "%.*s" spec with a "%s" spec
1910 static void gen_scanf_fmt(char *scanf_fmt, const char *rule)
1914 spec = strstr(rule, "%.*s");
1915 if (!spec || strstr(spec + 4, "%.*s"))
1916 die("invalid rule in ref_rev_parse_rules: %s", rule);
1918 /* copy all until spec */
1919 strncpy(scanf_fmt, rule, spec - rule);
1920 scanf_fmt[spec - rule] = '\0';
1922 strcat(scanf_fmt, "%s");
1923 /* copy remaining rule */
1924 strcat(scanf_fmt, spec + 4);
1929 char *shorten_unambiguous_ref(const char *ref, int strict)
1932 static char **scanf_fmts;
1933 static int nr_rules;
1936 /* pre generate scanf formats from ref_rev_parse_rules[] */
1938 size_t total_len = 0;
1940 /* the rule list is NULL terminated, count them first */
1941 for (; ref_rev_parse_rules[nr_rules]; nr_rules++)
1942 /* no +1 because strlen("%s") < strlen("%.*s") */
1943 total_len += strlen(ref_rev_parse_rules[nr_rules]);
1945 scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len);
1948 for (i = 0; i < nr_rules; i++) {
1949 scanf_fmts[i] = (char *)&scanf_fmts[nr_rules]
1951 gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]);
1952 total_len += strlen(ref_rev_parse_rules[i]);
1956 /* bail out if there are no rules */
1958 return xstrdup(ref);
1960 /* buffer for scanf result, at most ref must fit */
1961 short_name = xstrdup(ref);
1963 /* skip first rule, it will always match */
1964 for (i = nr_rules - 1; i > 0 ; --i) {
1966 int rules_to_fail = i;
1969 if (1 != sscanf(ref, scanf_fmts[i], short_name))
1972 short_name_len = strlen(short_name);
1975 * in strict mode, all (except the matched one) rules
1976 * must fail to resolve to a valid non-ambiguous ref
1979 rules_to_fail = nr_rules;
1982 * check if the short name resolves to a valid ref,
1983 * but use only rules prior to the matched one
1985 for (j = 0; j < rules_to_fail; j++) {
1986 const char *rule = ref_rev_parse_rules[j];
1987 unsigned char short_objectname[20];
1988 char refname[PATH_MAX];
1990 /* skip matched rule */
1995 * the short name is ambiguous, if it resolves
1996 * (with this previous rule) to a valid ref
1997 * read_ref() returns 0 on success
1999 mksnpath(refname, sizeof(refname),
2000 rule, short_name_len, short_name);
2001 if (!read_ref(refname, short_objectname))
2006 * short name is non-ambiguous if all previous rules
2007 * haven't resolved to a valid ref
2009 if (j == rules_to_fail)
2014 return xstrdup(ref);