7 /* ISSYMREF=01 and ISPACKED=02 are public interfaces */
8 #define REF_KNOWS_PEELED 04
11 struct ref_list *next;
12 unsigned char flag; /* ISSYMREF? ISPACKED? */
13 unsigned char sha1[20];
14 unsigned char peeled[20];
15 char name[FLEX_ARRAY];
18 static const char *parse_ref_line(char *line, unsigned char *sha1)
21 * 42: the answer to everything.
23 * In this case, it happens to be the answer to
24 * 40 (length of sha1 hex representation)
25 * +1 (space in between hex and name)
26 * +1 (newline at the end of the line)
28 int len = strlen(line) - 42;
32 if (get_sha1_hex(line, sha1) < 0)
34 if (!isspace(line[40]))
39 if (line[len] != '\n')
46 static struct ref_list *add_ref(const char *name, const unsigned char *sha1,
47 int flag, struct ref_list *list,
48 struct ref_list **new_entry)
51 struct ref_list *entry;
53 /* Allocate it and add it in.. */
54 len = strlen(name) + 1;
55 entry = xmalloc(sizeof(struct ref_list) + len);
56 hashcpy(entry->sha1, sha1);
57 hashclr(entry->peeled);
58 memcpy(entry->name, name, len);
66 /* merge sort the ref list */
67 static struct ref_list *sort_ref_list(struct ref_list *list)
69 int psize, qsize, last_merge_count, cmp;
70 struct ref_list *p, *q, *l, *e;
71 struct ref_list *new_list = list;
79 last_merge_count = merge_count;
92 while (psize < k && q->next) {
98 while ((psize > 0) || (qsize > 0 && q)) {
99 if (qsize == 0 || !q) {
103 } else if (psize == 0) {
108 cmp = strcmp(q->name, p->name);
113 } else if (cmp > 0) {
118 if (hashcmp(q->sha1, p->sha1))
119 die("Duplicated ref, and SHA1s don't match: %s",
121 warning("Duplicated ref: %s", q->name);
145 } while ((last_merge_count != merge_count) || (last_merge_count != 1));
151 * Future: need to be in "struct repository"
152 * when doing a full libification.
154 static struct cached_refs {
157 struct ref_list *loose;
158 struct ref_list *packed;
160 static struct ref_list *current_ref;
162 static struct ref_list *extra_refs;
164 static void free_ref_list(struct ref_list *list)
166 struct ref_list *next;
167 for ( ; list; list = next) {
173 static void invalidate_cached_refs(void)
175 struct cached_refs *ca = &cached_refs;
177 if (ca->did_loose && ca->loose)
178 free_ref_list(ca->loose);
179 if (ca->did_packed && ca->packed)
180 free_ref_list(ca->packed);
181 ca->loose = ca->packed = NULL;
182 ca->did_loose = ca->did_packed = 0;
185 static void read_packed_refs(FILE *f, struct cached_refs *cached_refs)
187 struct ref_list *list = NULL;
188 struct ref_list *last = NULL;
189 char refline[PATH_MAX];
190 int flag = REF_ISPACKED;
192 while (fgets(refline, sizeof(refline), f)) {
193 unsigned char sha1[20];
195 static const char header[] = "# pack-refs with:";
197 if (!strncmp(refline, header, sizeof(header)-1)) {
198 const char *traits = refline + sizeof(header) - 1;
199 if (strstr(traits, " peeled "))
200 flag |= REF_KNOWS_PEELED;
201 /* perhaps other traits later as well */
205 name = parse_ref_line(refline, sha1);
207 list = add_ref(name, sha1, flag, list, &last);
212 strlen(refline) == 42 &&
213 refline[41] == '\n' &&
214 !get_sha1_hex(refline + 1, sha1))
215 hashcpy(last->peeled, sha1);
217 cached_refs->packed = sort_ref_list(list);
220 void add_extra_ref(const char *name, const unsigned char *sha1, int flag)
222 extra_refs = add_ref(name, sha1, flag, extra_refs, NULL);
225 void clear_extra_refs(void)
227 free_ref_list(extra_refs);
231 static struct ref_list *get_packed_refs(void)
233 if (!cached_refs.did_packed) {
234 FILE *f = fopen(git_path("packed-refs"), "r");
235 cached_refs.packed = NULL;
237 read_packed_refs(f, &cached_refs);
240 cached_refs.did_packed = 1;
242 return cached_refs.packed;
245 static struct ref_list *get_ref_dir(const char *base, struct ref_list *list)
247 DIR *dir = opendir(git_path("%s", base));
251 int baselen = strlen(base);
252 char *ref = xmalloc(baselen + 257);
254 memcpy(ref, base, baselen);
255 if (baselen && base[baselen-1] != '/')
256 ref[baselen++] = '/';
258 while ((de = readdir(dir)) != NULL) {
259 unsigned char sha1[20];
264 if (de->d_name[0] == '.')
266 namelen = strlen(de->d_name);
269 if (has_extension(de->d_name, ".lock"))
271 memcpy(ref + baselen, de->d_name, namelen+1);
272 if (stat(git_path("%s", ref), &st) < 0)
274 if (S_ISDIR(st.st_mode)) {
275 list = get_ref_dir(ref, list);
278 if (!resolve_ref(ref, sha1, 1, &flag)) {
279 error("%s points nowhere!", ref);
282 list = add_ref(ref, sha1, flag, list, NULL);
287 return sort_ref_list(list);
290 static struct ref_list *get_loose_refs(void)
292 if (!cached_refs.did_loose) {
293 cached_refs.loose = get_ref_dir("refs", NULL);
294 cached_refs.did_loose = 1;
296 return cached_refs.loose;
299 /* We allow "recursive" symbolic refs. Only within reason, though */
301 #define MAXREFLEN (1024)
303 static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result)
306 struct cached_refs refs;
307 struct ref_list *ref;
310 strcpy(name + pathlen, "packed-refs");
311 f = fopen(name, "r");
314 read_packed_refs(f, &refs);
319 if (!strcmp(ref->name, refname)) {
321 memcpy(result, ref->sha1, 20);
326 free_ref_list(refs.packed);
330 static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion)
332 int fd, len = strlen(refname);
333 char buffer[128], *p;
335 if (recursion > MAXDEPTH || len > MAXREFLEN)
337 memcpy(name + pathlen, refname, len+1);
338 fd = open(name, O_RDONLY);
340 return resolve_gitlink_packed_ref(name, pathlen, refname, result);
342 len = read(fd, buffer, sizeof(buffer)-1);
346 while (len && isspace(buffer[len-1]))
350 /* Was it a detached head or an old-fashioned symlink? */
351 if (!get_sha1_hex(buffer, result))
355 if (strncmp(buffer, "ref:", 4))
361 return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1);
364 int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result)
366 int len = strlen(path), retval;
370 while (len && path[len-1] == '/')
374 gitdir = xmalloc(len + MAXREFLEN + 8);
375 memcpy(gitdir, path, len);
376 memcpy(gitdir + len, "/.git", 6);
379 tmp = read_gitfile_gently(gitdir);
383 gitdir = xmalloc(len + MAXREFLEN + 3);
384 memcpy(gitdir, tmp, len);
387 gitdir[++len] = '\0';
388 retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0);
394 * If the "reading" argument is set, this function finds out what _object_
395 * the ref points at by "reading" the ref. The ref, if it is not symbolic,
396 * has to exist, and if it is symbolic, it has to point at an existing ref,
397 * because the "read" goes through the symref to the ref it points at.
399 * The access that is not "reading" may often be "writing", but does not
400 * have to; it can be merely checking _where it leads to_. If it is a
401 * prelude to "writing" to the ref, a write to a symref that points at
402 * yet-to-be-born ref will create the real ref pointed by the symref.
403 * reading=0 allows the caller to check where such a symref leads to.
405 const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
407 int depth = MAXDEPTH;
410 static char ref_buffer[256];
424 git_snpath(path, sizeof(path), "%s", ref);
425 /* Special case: non-existing file. */
426 if (lstat(path, &st) < 0) {
427 struct ref_list *list = get_packed_refs();
429 if (!strcmp(ref, list->name)) {
430 hashcpy(sha1, list->sha1);
432 *flag |= REF_ISPACKED;
437 if (reading || errno != ENOENT)
443 /* Follow "normalized" - ie "refs/.." symlinks by hand */
444 if (S_ISLNK(st.st_mode)) {
445 len = readlink(path, buffer, sizeof(buffer)-1);
446 if (len >= 5 && !memcmp("refs/", buffer, 5)) {
448 strcpy(ref_buffer, buffer);
451 *flag |= REF_ISSYMREF;
456 /* Is it a directory? */
457 if (S_ISDIR(st.st_mode)) {
463 * Anything else, just open it and try to use it as
466 fd = open(path, O_RDONLY);
469 len = read_in_full(fd, buffer, sizeof(buffer)-1);
473 * Is it a symbolic ref?
475 if (len < 4 || memcmp("ref:", buffer, 4))
479 while (len && isspace(*buf))
481 while (len && isspace(buf[len-1]))
484 memcpy(ref_buffer, buf, len + 1);
487 *flag |= REF_ISSYMREF;
489 if (len < 40 || get_sha1_hex(buffer, sha1))
494 int read_ref(const char *ref, unsigned char *sha1)
496 if (resolve_ref(ref, sha1, 1, NULL))
501 static int do_one_ref(const char *base, each_ref_fn fn, int trim,
502 void *cb_data, struct ref_list *entry)
504 if (strncmp(base, entry->name, trim))
506 if (is_null_sha1(entry->sha1))
508 if (!has_sha1_file(entry->sha1)) {
509 error("%s does not point to a valid object!", entry->name);
513 return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
516 int peel_ref(const char *ref, unsigned char *sha1)
519 unsigned char base[20];
522 if (current_ref && (current_ref->name == ref
523 || !strcmp(current_ref->name, ref))) {
524 if (current_ref->flag & REF_KNOWS_PEELED) {
525 hashcpy(sha1, current_ref->peeled);
528 hashcpy(base, current_ref->sha1);
532 if (!resolve_ref(ref, base, 1, &flag))
535 if ((flag & REF_ISPACKED)) {
536 struct ref_list *list = get_packed_refs();
539 if (!strcmp(list->name, ref)) {
540 if (list->flag & REF_KNOWS_PEELED) {
541 hashcpy(sha1, list->peeled);
544 /* older pack-refs did not leave peeled ones */
552 o = parse_object(base);
553 if (o && o->type == OBJ_TAG) {
554 o = deref_tag(o, ref, 0);
556 hashcpy(sha1, o->sha1);
563 static int do_for_each_ref(const char *base, each_ref_fn fn, int trim,
567 struct ref_list *packed = get_packed_refs();
568 struct ref_list *loose = get_loose_refs();
570 struct ref_list *extra;
572 for (extra = extra_refs; extra; extra = extra->next)
573 retval = do_one_ref(base, fn, trim, cb_data, extra);
575 while (packed && loose) {
576 struct ref_list *entry;
577 int cmp = strcmp(packed->name, loose->name);
579 packed = packed->next;
587 packed = packed->next;
589 retval = do_one_ref(base, fn, trim, cb_data, entry);
594 for (packed = packed ? packed : loose; packed; packed = packed->next) {
595 retval = do_one_ref(base, fn, trim, cb_data, packed);
605 int head_ref(each_ref_fn fn, void *cb_data)
607 unsigned char sha1[20];
610 if (resolve_ref("HEAD", sha1, 1, &flag))
611 return fn("HEAD", sha1, flag, cb_data);
615 int for_each_ref(each_ref_fn fn, void *cb_data)
617 return do_for_each_ref("refs/", fn, 0, cb_data);
620 int for_each_tag_ref(each_ref_fn fn, void *cb_data)
622 return do_for_each_ref("refs/tags/", fn, 10, cb_data);
625 int for_each_branch_ref(each_ref_fn fn, void *cb_data)
627 return do_for_each_ref("refs/heads/", fn, 11, cb_data);
630 int for_each_remote_ref(each_ref_fn fn, void *cb_data)
632 return do_for_each_ref("refs/remotes/", fn, 13, cb_data);
636 * Make sure "ref" is something reasonable to have under ".git/refs/";
637 * We do not like it if:
639 * - any path component of it begins with ".", or
640 * - it has double dots "..", or
641 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
642 * - it ends with a "/".
645 static inline int bad_ref_char(int ch)
647 if (((unsigned) ch) <= ' ' ||
648 ch == '~' || ch == '^' || ch == ':')
650 /* 2.13 Pattern Matching Notation */
651 if (ch == '?' || ch == '[') /* Unsupported */
653 if (ch == '*') /* Supported at the end */
658 int check_ref_format(const char *ref)
660 int ch, level, bad_type;
661 const char *cp = ref;
665 while ((ch = *cp++) == '/')
666 ; /* tolerate duplicated slashes */
668 /* should not end with slashes */
669 return CHECK_REF_FORMAT_ERROR;
671 /* we are at the beginning of the path component */
673 return CHECK_REF_FORMAT_ERROR;
674 bad_type = bad_ref_char(ch);
676 return (bad_type == 2 && !*cp)
677 ? CHECK_REF_FORMAT_WILDCARD
678 : CHECK_REF_FORMAT_ERROR;
681 /* scan the rest of the path component */
682 while ((ch = *cp++) != 0) {
683 bad_type = bad_ref_char(ch);
685 return (bad_type == 2 && !*cp)
686 ? CHECK_REF_FORMAT_WILDCARD
687 : CHECK_REF_FORMAT_ERROR;
691 if (ch == '.' && *cp == '.')
692 return CHECK_REF_FORMAT_ERROR;
697 return CHECK_REF_FORMAT_ONELEVEL;
698 return CHECK_REF_FORMAT_OK;
703 const char *ref_rev_parse_rules[] = {
709 "refs/remotes/%.*s/HEAD",
713 const char *ref_fetch_rules[] = {
720 int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
723 const int abbrev_name_len = strlen(abbrev_name);
725 for (p = rules; *p; p++) {
726 if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
734 static struct ref_lock *verify_lock(struct ref_lock *lock,
735 const unsigned char *old_sha1, int mustexist)
737 if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
738 error("Can't verify ref %s", lock->ref_name);
742 if (hashcmp(lock->old_sha1, old_sha1)) {
743 error("Ref %s is at %s but expected %s", lock->ref_name,
744 sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
751 static int remove_empty_directories(const char *file)
753 /* we want to create a file but there is a directory there;
754 * if that is an empty directory (or a directory that contains
755 * only empty directories), remove them.
760 strbuf_init(&path, 20);
761 strbuf_addstr(&path, file);
763 result = remove_dir_recursively(&path, 1);
765 strbuf_release(&path);
770 static int is_refname_available(const char *ref, const char *oldref,
771 struct ref_list *list, int quiet)
773 int namlen = strlen(ref); /* e.g. 'foo/bar' */
775 /* list->name could be 'foo' or 'foo/bar/baz' */
776 if (!oldref || strcmp(oldref, list->name)) {
777 int len = strlen(list->name);
778 int cmplen = (namlen < len) ? namlen : len;
779 const char *lead = (namlen < len) ? list->name : ref;
780 if (!strncmp(ref, list->name, cmplen) &&
781 lead[cmplen] == '/') {
783 error("'%s' exists; cannot create '%s'",
793 static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p)
796 const char *orig_ref = ref;
797 struct ref_lock *lock;
801 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
803 lock = xcalloc(1, sizeof(struct ref_lock));
806 ref = resolve_ref(ref, lock->old_sha1, mustexist, &type);
807 if (!ref && errno == EISDIR) {
808 /* we are trying to lock foo but we used to
809 * have foo/bar which now does not exist;
810 * it is normal for the empty directory 'foo'
813 ref_file = git_path("%s", orig_ref);
814 if (remove_empty_directories(ref_file)) {
816 error("there are still refs under '%s'", orig_ref);
819 ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type);
825 error("unable to resolve reference %s: %s",
826 orig_ref, strerror(errno));
829 /* When the ref did not exist and we are creating it,
830 * make sure there is no existing ref that is packed
831 * whose name begins with our refname, nor a ref whose
832 * name is a proper prefix of our refname.
834 if (is_null_sha1(lock->old_sha1) &&
835 !is_refname_available(ref, NULL, get_packed_refs(), 0))
838 lock->lk = xcalloc(1, sizeof(struct lock_file));
840 lflags = LOCK_DIE_ON_ERROR;
841 if (flags & REF_NODEREF) {
843 lflags |= LOCK_NODEREF;
845 lock->ref_name = xstrdup(ref);
846 lock->orig_ref_name = xstrdup(orig_ref);
847 ref_file = git_path("%s", ref);
848 if (lstat(ref_file, &st) && errno == ENOENT)
849 lock->force_write = 1;
850 if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
851 lock->force_write = 1;
853 if (safe_create_leading_directories(ref_file)) {
855 error("unable to create directory for %s", ref_file);
859 lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
860 return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
868 struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
870 char refpath[PATH_MAX];
871 if (check_ref_format(ref))
873 strcpy(refpath, mkpath("refs/%s", ref));
874 return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
877 struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags)
879 switch (check_ref_format(ref)) {
883 case CHECK_REF_FORMAT_ONELEVEL:
884 return lock_ref_sha1_basic(ref, old_sha1, flags, NULL);
888 static struct lock_file packlock;
890 static int repack_without_ref(const char *refname)
892 struct ref_list *list, *packed_ref_list;
896 packed_ref_list = get_packed_refs();
897 for (list = packed_ref_list; list; list = list->next) {
898 if (!strcmp(refname, list->name)) {
905 fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
907 return error("cannot delete '%s' from packed refs", refname);
909 for (list = packed_ref_list; list; list = list->next) {
910 char line[PATH_MAX + 100];
913 if (!strcmp(refname, list->name))
915 len = snprintf(line, sizeof(line), "%s %s\n",
916 sha1_to_hex(list->sha1), list->name);
917 /* this should not happen but just being defensive */
918 if (len > sizeof(line))
919 die("too long a refname '%s'", list->name);
920 write_or_die(fd, line, len);
922 return commit_lock_file(&packlock);
925 int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
927 struct ref_lock *lock;
928 int err, i = 0, ret = 0, flag = 0;
930 lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
933 if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
937 if (!(delopt & REF_NODEREF)) {
938 i = strlen(lock->lk->filename) - 5; /* .lock */
939 lock->lk->filename[i] = 0;
940 path = lock->lk->filename;
942 path = git_path(refname);
945 if (err && errno != ENOENT) {
947 error("unlink(%s) failed: %s",
948 path, strerror(errno));
950 if (!(delopt & REF_NODEREF))
951 lock->lk->filename[i] = '.';
953 /* removing the loose one could have resurrected an earlier
954 * packed one. Also, if it was not loose we need to repack
957 ret |= repack_without_ref(refname);
959 err = unlink(git_path("logs/%s", lock->ref_name));
960 if (err && errno != ENOENT)
961 fprintf(stderr, "warning: unlink(%s) failed: %s",
962 git_path("logs/%s", lock->ref_name), strerror(errno));
963 invalidate_cached_refs();
968 int rename_ref(const char *oldref, const char *newref, const char *logmsg)
970 static const char renamed_ref[] = "RENAMED-REF";
971 unsigned char sha1[20], orig_sha1[20];
972 int flag = 0, logmoved = 0;
973 struct ref_lock *lock;
975 int log = !lstat(git_path("logs/%s", oldref), &loginfo);
976 const char *symref = NULL;
978 if (log && S_ISLNK(loginfo.st_mode))
979 return error("reflog for %s is a symlink", oldref);
981 symref = resolve_ref(oldref, orig_sha1, 1, &flag);
982 if (flag & REF_ISSYMREF)
983 return error("refname %s is a symbolic ref, renaming it is not supported",
986 return error("refname %s not found", oldref);
988 if (!is_refname_available(newref, oldref, get_packed_refs(), 0))
991 if (!is_refname_available(newref, oldref, get_loose_refs(), 0))
994 lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL);
996 return error("unable to lock %s", renamed_ref);
997 lock->force_write = 1;
998 if (write_ref_sha1(lock, orig_sha1, logmsg))
999 return error("unable to save current sha1 in %s", renamed_ref);
1001 if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log")))
1002 return error("unable to move logfile logs/%s to tmp-renamed-log: %s",
1003 oldref, strerror(errno));
1005 if (delete_ref(oldref, orig_sha1, REF_NODEREF)) {
1006 error("unable to delete old %s", oldref);
1010 if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) {
1011 if (errno==EISDIR) {
1012 if (remove_empty_directories(git_path("%s", newref))) {
1013 error("Directory not empty: %s", newref);
1017 error("unable to delete existing %s", newref);
1022 if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
1023 error("unable to create directory for %s", newref);
1028 if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) {
1029 if (errno==EISDIR || errno==ENOTDIR) {
1031 * rename(a, b) when b is an existing
1032 * directory ought to result in ISDIR, but
1033 * Solaris 5.8 gives ENOTDIR. Sheesh.
1035 if (remove_empty_directories(git_path("logs/%s", newref))) {
1036 error("Directory not empty: logs/%s", newref);
1041 error("unable to move logfile tmp-renamed-log to logs/%s: %s",
1042 newref, strerror(errno));
1048 lock = lock_ref_sha1_basic(newref, NULL, 0, NULL);
1050 error("unable to lock %s for update", newref);
1053 lock->force_write = 1;
1054 hashcpy(lock->old_sha1, orig_sha1);
1055 if (write_ref_sha1(lock, orig_sha1, logmsg)) {
1056 error("unable to write current sha1 into %s", newref);
1063 lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL);
1065 error("unable to lock %s for rollback", oldref);
1069 lock->force_write = 1;
1070 flag = log_all_ref_updates;
1071 log_all_ref_updates = 0;
1072 if (write_ref_sha1(lock, orig_sha1, NULL))
1073 error("unable to write current sha1 into %s", oldref);
1074 log_all_ref_updates = flag;
1077 if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
1078 error("unable to restore logfile %s from %s: %s",
1079 oldref, newref, strerror(errno));
1080 if (!logmoved && log &&
1081 rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref)))
1082 error("unable to restore logfile %s from tmp-renamed-log: %s",
1083 oldref, strerror(errno));
1088 int close_ref(struct ref_lock *lock)
1090 if (close_lock_file(lock->lk))
1096 int commit_ref(struct ref_lock *lock)
1098 if (commit_lock_file(lock->lk))
1104 void unlock_ref(struct ref_lock *lock)
1106 /* Do not free lock->lk -- atexit() still looks at them */
1108 rollback_lock_file(lock->lk);
1109 free(lock->ref_name);
1110 free(lock->orig_ref_name);
1115 * copy the reflog message msg to buf, which has been allocated sufficiently
1116 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1117 * because reflog file is one line per entry.
1119 static int copy_msg(char *buf, const char *msg)
1126 while ((c = *msg++)) {
1127 if (wasspace && isspace(c))
1129 wasspace = isspace(c);
1134 while (buf < cp && isspace(cp[-1]))
1140 static int log_ref_write(const char *ref_name, const unsigned char *old_sha1,
1141 const unsigned char *new_sha1, const char *msg)
1143 int logfd, written, oflags = O_APPEND | O_WRONLY;
1144 unsigned maxlen, len;
1146 char log_file[PATH_MAX];
1148 const char *committer;
1150 if (log_all_ref_updates < 0)
1151 log_all_ref_updates = !is_bare_repository();
1153 git_snpath(log_file, sizeof(log_file), "logs/%s", ref_name);
1155 if (log_all_ref_updates &&
1156 (!prefixcmp(ref_name, "refs/heads/") ||
1157 !prefixcmp(ref_name, "refs/remotes/") ||
1158 !strcmp(ref_name, "HEAD"))) {
1159 if (safe_create_leading_directories(log_file) < 0)
1160 return error("unable to create directory for %s",
1165 logfd = open(log_file, oflags, 0666);
1167 if (!(oflags & O_CREAT) && errno == ENOENT)
1170 if ((oflags & O_CREAT) && errno == EISDIR) {
1171 if (remove_empty_directories(log_file)) {
1172 return error("There are still logs under '%s'",
1175 logfd = open(log_file, oflags, 0666);
1179 return error("Unable to append to %s: %s",
1180 log_file, strerror(errno));
1183 adjust_shared_perm(log_file);
1185 msglen = msg ? strlen(msg) : 0;
1186 committer = git_committer_info(0);
1187 maxlen = strlen(committer) + msglen + 100;
1188 logrec = xmalloc(maxlen);
1189 len = sprintf(logrec, "%s %s %s\n",
1190 sha1_to_hex(old_sha1),
1191 sha1_to_hex(new_sha1),
1194 len += copy_msg(logrec + len - 1, msg) - 1;
1195 written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
1197 if (close(logfd) != 0 || written != len)
1198 return error("Unable to append to %s", log_file);
1202 static int is_branch(const char *refname)
1204 return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
1207 int write_ref_sha1(struct ref_lock *lock,
1208 const unsigned char *sha1, const char *logmsg)
1210 static char term = '\n';
1215 if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
1219 o = parse_object(sha1);
1221 error("Trying to write ref %s with nonexistant object %s",
1222 lock->ref_name, sha1_to_hex(sha1));
1226 if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
1227 error("Trying to write non-commit object %s to branch %s",
1228 sha1_to_hex(sha1), lock->ref_name);
1232 if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
1233 write_in_full(lock->lock_fd, &term, 1) != 1
1234 || close_ref(lock) < 0) {
1235 error("Couldn't write %s", lock->lk->filename);
1239 invalidate_cached_refs();
1240 if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
1241 (strcmp(lock->ref_name, lock->orig_ref_name) &&
1242 log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
1246 if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
1248 * Special hack: If a branch is updated directly and HEAD
1249 * points to it (may happen on the remote side of a push
1250 * for example) then logically the HEAD reflog should be
1252 * A generic solution implies reverse symref information,
1253 * but finding all symrefs pointing to the given branch
1254 * would be rather costly for this rare event (the direct
1255 * update of a branch) to be worth it. So let's cheat and
1256 * check with HEAD only which should cover 99% of all usage
1257 * scenarios (even 100% of the default ones).
1259 unsigned char head_sha1[20];
1261 const char *head_ref;
1262 head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag);
1263 if (head_ref && (head_flag & REF_ISSYMREF) &&
1264 !strcmp(head_ref, lock->ref_name))
1265 log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
1267 if (commit_ref(lock)) {
1268 error("Couldn't set %s", lock->ref_name);
1276 int create_symref(const char *ref_target, const char *refs_heads_master,
1279 const char *lockpath;
1281 int fd, len, written;
1282 char *git_HEAD = git_pathdup("%s", ref_target);
1283 unsigned char old_sha1[20], new_sha1[20];
1285 if (logmsg && read_ref(ref_target, old_sha1))
1288 if (safe_create_leading_directories(git_HEAD) < 0)
1289 return error("unable to create directory for %s", git_HEAD);
1291 #ifndef NO_SYMLINK_HEAD
1292 if (prefer_symlink_refs) {
1294 if (!symlink(refs_heads_master, git_HEAD))
1296 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
1300 len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
1301 if (sizeof(ref) <= len) {
1302 error("refname too long: %s", refs_heads_master);
1303 goto error_free_return;
1305 lockpath = mkpath("%s.lock", git_HEAD);
1306 fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
1308 error("Unable to open %s for writing", lockpath);
1309 goto error_free_return;
1311 written = write_in_full(fd, ref, len);
1312 if (close(fd) != 0 || written != len) {
1313 error("Unable to write to %s", lockpath);
1314 goto error_unlink_return;
1316 if (rename(lockpath, git_HEAD) < 0) {
1317 error("Unable to create %s", git_HEAD);
1318 goto error_unlink_return;
1320 if (adjust_shared_perm(git_HEAD)) {
1321 error("Unable to fix permissions on %s", lockpath);
1322 error_unlink_return:
1329 #ifndef NO_SYMLINK_HEAD
1332 if (logmsg && !read_ref(refs_heads_master, new_sha1))
1333 log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
1339 static char *ref_msg(const char *line, const char *endp)
1343 ep = memchr(line, '\n', endp - line);
1346 return xmemdupz(line, ep - line);
1349 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)
1351 const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
1353 int logfd, tz, reccnt = 0;
1356 unsigned char logged_sha1[20];
1360 logfile = git_path("logs/%s", ref);
1361 logfd = open(logfile, O_RDONLY, 0);
1363 die("Unable to read log %s: %s", logfile, strerror(errno));
1366 die("Log %s is empty.", logfile);
1367 mapsz = xsize_t(st.st_size);
1368 log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
1369 logdata = log_mapped;
1373 rec = logend = logdata + st.st_size;
1374 while (logdata < rec) {
1376 if (logdata < rec && *(rec-1) == '\n')
1379 while (logdata < rec && *(rec-1) != '\n') {
1385 die("Log %s is corrupt.", logfile);
1386 date = strtoul(lastgt + 1, &tz_c, 10);
1387 if (date <= at_time || cnt == 0) {
1388 tz = strtoul(tz_c, NULL, 10);
1390 *msg = ref_msg(rec, logend);
1392 *cutoff_time = date;
1396 *cutoff_cnt = reccnt - 1;
1398 if (get_sha1_hex(lastrec, logged_sha1))
1399 die("Log %s is corrupt.", logfile);
1400 if (get_sha1_hex(rec + 41, sha1))
1401 die("Log %s is corrupt.", logfile);
1402 if (hashcmp(logged_sha1, sha1)) {
1404 "warning: Log %s has gap after %s.\n",
1405 logfile, show_date(date, tz, DATE_RFC2822));
1408 else if (date == at_time) {
1409 if (get_sha1_hex(rec + 41, sha1))
1410 die("Log %s is corrupt.", logfile);
1413 if (get_sha1_hex(rec + 41, logged_sha1))
1414 die("Log %s is corrupt.", logfile);
1415 if (hashcmp(logged_sha1, sha1)) {
1417 "warning: Log %s unexpectedly ended on %s.\n",
1418 logfile, show_date(date, tz, DATE_RFC2822));
1421 munmap(log_mapped, mapsz);
1430 while (rec < logend && *rec != '>' && *rec != '\n')
1432 if (rec == logend || *rec == '\n')
1433 die("Log %s is corrupt.", logfile);
1434 date = strtoul(rec + 1, &tz_c, 10);
1435 tz = strtoul(tz_c, NULL, 10);
1436 if (get_sha1_hex(logdata, sha1))
1437 die("Log %s is corrupt.", logfile);
1438 if (is_null_sha1(sha1)) {
1439 if (get_sha1_hex(logdata + 41, sha1))
1440 die("Log %s is corrupt.", logfile);
1443 *msg = ref_msg(logdata, logend);
1444 munmap(log_mapped, mapsz);
1447 *cutoff_time = date;
1451 *cutoff_cnt = reccnt;
1455 int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data)
1457 const char *logfile;
1462 logfile = git_path("logs/%s", ref);
1463 logfp = fopen(logfile, "r");
1466 while (fgets(buf, sizeof(buf), logfp)) {
1467 unsigned char osha1[20], nsha1[20];
1468 char *email_end, *message;
1469 unsigned long timestamp;
1472 /* old SP new SP name <email> SP time TAB msg LF */
1474 if (len < 83 || buf[len-1] != '\n' ||
1475 get_sha1_hex(buf, osha1) || buf[40] != ' ' ||
1476 get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' ||
1477 !(email_end = strchr(buf + 82, '>')) ||
1478 email_end[1] != ' ' ||
1479 !(timestamp = strtoul(email_end + 2, &message, 10)) ||
1480 !message || message[0] != ' ' ||
1481 (message[1] != '+' && message[1] != '-') ||
1482 !isdigit(message[2]) || !isdigit(message[3]) ||
1483 !isdigit(message[4]) || !isdigit(message[5]))
1484 continue; /* corrupt? */
1485 email_end[1] = '\0';
1486 tz = strtol(message + 1, NULL, 10);
1487 if (message[6] != '\t')
1491 ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data);
1499 static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data)
1501 DIR *dir = opendir(git_path("logs/%s", base));
1506 int baselen = strlen(base);
1507 char *log = xmalloc(baselen + 257);
1509 memcpy(log, base, baselen);
1510 if (baselen && base[baselen-1] != '/')
1511 log[baselen++] = '/';
1513 while ((de = readdir(dir)) != NULL) {
1517 if (de->d_name[0] == '.')
1519 namelen = strlen(de->d_name);
1522 if (has_extension(de->d_name, ".lock"))
1524 memcpy(log + baselen, de->d_name, namelen+1);
1525 if (stat(git_path("logs/%s", log), &st) < 0)
1527 if (S_ISDIR(st.st_mode)) {
1528 retval = do_for_each_reflog(log, fn, cb_data);
1530 unsigned char sha1[20];
1531 if (!resolve_ref(log, sha1, 0, NULL))
1532 retval = error("bad ref for %s", log);
1534 retval = fn(log, sha1, 0, cb_data);
1547 int for_each_reflog(each_ref_fn fn, void *cb_data)
1549 return do_for_each_reflog("", fn, cb_data);
1552 int update_ref(const char *action, const char *refname,
1553 const unsigned char *sha1, const unsigned char *oldval,
1554 int flags, enum action_on_err onerr)
1556 static struct ref_lock *lock;
1557 lock = lock_any_ref_for_update(refname, oldval, flags);
1559 const char *str = "Cannot lock the ref '%s'.";
1561 case MSG_ON_ERR: error(str, refname); break;
1562 case DIE_ON_ERR: die(str, refname); break;
1563 case QUIET_ON_ERR: break;
1567 if (write_ref_sha1(lock, sha1, action) < 0) {
1568 const char *str = "Cannot update the ref '%s'.";
1570 case MSG_ON_ERR: error(str, refname); break;
1571 case DIE_ON_ERR: die(str, refname); break;
1572 case QUIET_ON_ERR: break;
1579 struct ref *find_ref_by_name(struct ref *list, const char *name)
1581 for ( ; list; list = list->next)
1582 if (!strcmp(list->name, name))