6 /* ISSYMREF=01 and ISPACKED=02 are public interfaces */
7 #define REF_KNOWS_PEELED 04
10 struct ref_list *next;
11 unsigned char flag; /* ISSYMREF? ISPACKED? */
12 unsigned char sha1[20];
13 unsigned char peeled[20];
14 char name[FLEX_ARRAY];
17 static const char *parse_ref_line(char *line, unsigned char *sha1)
20 * 42: the answer to everything.
22 * In this case, it happens to be the answer to
23 * 40 (length of sha1 hex representation)
24 * +1 (space in between hex and name)
25 * +1 (newline at the end of the line)
27 int len = strlen(line) - 42;
31 if (get_sha1_hex(line, sha1) < 0)
33 if (!isspace(line[40]))
38 if (line[len] != '\n')
45 static struct ref_list *add_ref(const char *name, const unsigned char *sha1,
46 int flag, struct ref_list *list,
47 struct ref_list **new_entry)
50 struct ref_list **p = &list, *entry;
52 /* Find the place to insert the ref into.. */
53 while ((entry = *p) != NULL) {
54 int cmp = strcmp(entry->name, name);
58 /* Same as existing entry? */
67 /* Allocate it and add it in.. */
68 len = strlen(name) + 1;
69 entry = xmalloc(sizeof(struct ref_list) + len);
70 hashcpy(entry->sha1, sha1);
71 hashclr(entry->peeled);
72 memcpy(entry->name, name, len);
82 * Future: need to be in "struct repository"
83 * when doing a full libification.
88 struct ref_list *loose;
89 struct ref_list *packed;
92 static void free_ref_list(struct ref_list *list)
94 struct ref_list *next;
95 for ( ; list; list = next) {
101 static void invalidate_cached_refs(void)
103 struct cached_refs *ca = &cached_refs;
105 if (ca->did_loose && ca->loose)
106 free_ref_list(ca->loose);
107 if (ca->did_packed && ca->packed)
108 free_ref_list(ca->packed);
109 ca->loose = ca->packed = NULL;
110 ca->did_loose = ca->did_packed = 0;
113 static void read_packed_refs(FILE *f, struct cached_refs *cached_refs)
115 struct ref_list *list = NULL;
116 struct ref_list *last = NULL;
117 char refline[PATH_MAX];
118 int flag = REF_ISPACKED;
120 while (fgets(refline, sizeof(refline), f)) {
121 unsigned char sha1[20];
123 static const char header[] = "# pack-refs with:";
125 if (!strncmp(refline, header, sizeof(header)-1)) {
126 const char *traits = refline + sizeof(header) - 1;
127 if (strstr(traits, " peeled "))
128 flag |= REF_KNOWS_PEELED;
129 /* perhaps other traits later as well */
133 name = parse_ref_line(refline, sha1);
135 list = add_ref(name, sha1, flag, list, &last);
140 strlen(refline) == 42 &&
141 refline[41] == '\n' &&
142 !get_sha1_hex(refline + 1, sha1))
143 hashcpy(last->peeled, sha1);
145 cached_refs->packed = list;
148 static struct ref_list *get_packed_refs(void)
150 if (!cached_refs.did_packed) {
151 FILE *f = fopen(git_path("packed-refs"), "r");
152 cached_refs.packed = NULL;
154 read_packed_refs(f, &cached_refs);
157 cached_refs.did_packed = 1;
159 return cached_refs.packed;
162 static struct ref_list *get_ref_dir(const char *base, struct ref_list *list)
164 DIR *dir = opendir(git_path("%s", base));
168 int baselen = strlen(base);
169 char *ref = xmalloc(baselen + 257);
171 memcpy(ref, base, baselen);
172 if (baselen && base[baselen-1] != '/')
173 ref[baselen++] = '/';
175 while ((de = readdir(dir)) != NULL) {
176 unsigned char sha1[20];
181 if (de->d_name[0] == '.')
183 namelen = strlen(de->d_name);
186 if (has_extension(de->d_name, ".lock"))
188 memcpy(ref + baselen, de->d_name, namelen+1);
189 if (stat(git_path("%s", ref), &st) < 0)
191 if (S_ISDIR(st.st_mode)) {
192 list = get_ref_dir(ref, list);
195 if (!resolve_ref(ref, sha1, 1, &flag)) {
196 error("%s points nowhere!", ref);
199 list = add_ref(ref, sha1, flag, list, NULL);
207 static struct ref_list *get_loose_refs(void)
209 if (!cached_refs.did_loose) {
210 cached_refs.loose = get_ref_dir("refs", NULL);
211 cached_refs.did_loose = 1;
213 return cached_refs.loose;
216 /* We allow "recursive" symbolic refs. Only within reason, though */
219 const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
221 int depth = MAXDEPTH, len;
223 static char ref_buffer[256];
229 const char *path = git_path("%s", ref);
237 /* Special case: non-existing file.
238 * Not having the refs/heads/new-branch is OK
239 * if we are writing into it, so is .git/HEAD
240 * that points at refs/heads/master still to be
241 * born. It is NOT OK if we are resolving for
244 if (lstat(path, &st) < 0) {
245 struct ref_list *list = get_packed_refs();
247 if (!strcmp(ref, list->name)) {
248 hashcpy(sha1, list->sha1);
250 *flag |= REF_ISPACKED;
255 if (reading || errno != ENOENT)
261 /* Follow "normalized" - ie "refs/.." symlinks by hand */
262 if (S_ISLNK(st.st_mode)) {
263 len = readlink(path, buffer, sizeof(buffer)-1);
264 if (len >= 5 && !memcmp("refs/", buffer, 5)) {
266 strcpy(ref_buffer, buffer);
269 *flag |= REF_ISSYMREF;
274 /* Is it a directory? */
275 if (S_ISDIR(st.st_mode)) {
281 * Anything else, just open it and try to use it as
284 fd = open(path, O_RDONLY);
287 len = read_in_full(fd, buffer, sizeof(buffer)-1);
291 * Is it a symbolic ref?
293 if (len < 4 || memcmp("ref:", buffer, 4))
297 while (len && isspace(*buf))
299 while (len && isspace(buf[len-1]))
302 memcpy(ref_buffer, buf, len + 1);
305 *flag |= REF_ISSYMREF;
307 if (len < 40 || get_sha1_hex(buffer, sha1))
312 int read_ref(const char *ref, unsigned char *sha1)
314 if (resolve_ref(ref, sha1, 1, NULL))
319 static int do_one_ref(const char *base, each_ref_fn fn, int trim,
320 void *cb_data, struct ref_list *entry)
322 if (strncmp(base, entry->name, trim))
324 if (is_null_sha1(entry->sha1))
326 if (!has_sha1_file(entry->sha1)) {
327 error("%s does not point to a valid object!", entry->name);
330 return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
333 int peel_ref(const char *ref, unsigned char *sha1)
336 unsigned char base[20];
339 if (!resolve_ref(ref, base, 1, &flag))
342 if ((flag & REF_ISPACKED)) {
343 struct ref_list *list = get_packed_refs();
346 if (!strcmp(list->name, ref)) {
347 if (list->flag & REF_KNOWS_PEELED) {
348 hashcpy(sha1, list->peeled);
351 /* older pack-refs did not leave peeled ones */
358 /* fallback - callers should not call this for unpacked refs */
359 o = parse_object(base);
360 if (o->type == OBJ_TAG) {
361 o = deref_tag(o, ref, 0);
363 hashcpy(sha1, o->sha1);
370 static int do_for_each_ref(const char *base, each_ref_fn fn, int trim,
374 struct ref_list *packed = get_packed_refs();
375 struct ref_list *loose = get_loose_refs();
377 while (packed && loose) {
378 struct ref_list *entry;
379 int cmp = strcmp(packed->name, loose->name);
381 packed = packed->next;
389 packed = packed->next;
391 retval = do_one_ref(base, fn, trim, cb_data, entry);
396 for (packed = packed ? packed : loose; packed; packed = packed->next) {
397 retval = do_one_ref(base, fn, trim, cb_data, packed);
404 int head_ref(each_ref_fn fn, void *cb_data)
406 unsigned char sha1[20];
409 if (resolve_ref("HEAD", sha1, 1, &flag))
410 return fn("HEAD", sha1, flag, cb_data);
414 int for_each_ref(each_ref_fn fn, void *cb_data)
416 return do_for_each_ref("refs/", fn, 0, cb_data);
419 int for_each_tag_ref(each_ref_fn fn, void *cb_data)
421 return do_for_each_ref("refs/tags/", fn, 10, cb_data);
424 int for_each_branch_ref(each_ref_fn fn, void *cb_data)
426 return do_for_each_ref("refs/heads/", fn, 11, cb_data);
429 int for_each_remote_ref(each_ref_fn fn, void *cb_data)
431 return do_for_each_ref("refs/remotes/", fn, 13, cb_data);
434 /* NEEDSWORK: This is only used by ssh-upload and it should go; the
435 * caller should do resolve_ref or read_ref like everybody else. Or
436 * maybe everybody else should use get_ref_sha1() instead of doing
439 int get_ref_sha1(const char *ref, unsigned char *sha1)
441 if (check_ref_format(ref))
443 return read_ref(mkpath("refs/%s", ref), sha1);
447 * Make sure "ref" is something reasonable to have under ".git/refs/";
448 * We do not like it if:
450 * - any path component of it begins with ".", or
451 * - it has double dots "..", or
452 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
453 * - it ends with a "/".
456 static inline int bad_ref_char(int ch)
458 return (((unsigned) ch) <= ' ' ||
459 ch == '~' || ch == '^' || ch == ':' ||
460 /* 2.13 Pattern Matching Notation */
461 ch == '?' || ch == '*' || ch == '[');
464 int check_ref_format(const char *ref)
467 const char *cp = ref;
471 while ((ch = *cp++) == '/')
472 ; /* tolerate duplicated slashes */
474 return -1; /* should not end with slashes */
476 /* we are at the beginning of the path component */
477 if (ch == '.' || bad_ref_char(ch))
480 /* scan the rest of the path component */
481 while ((ch = *cp++) != 0) {
482 if (bad_ref_char(ch))
486 if (ch == '.' && *cp == '.')
492 return -2; /* at least of form "heads/blah" */
498 static struct ref_lock *verify_lock(struct ref_lock *lock,
499 const unsigned char *old_sha1, int mustexist)
501 if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
502 error("Can't verify ref %s", lock->ref_name);
506 if (hashcmp(lock->old_sha1, old_sha1)) {
507 error("Ref %s is at %s but expected %s", lock->ref_name,
508 sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
515 static int remove_empty_dir_recursive(char *path, int len)
517 DIR *dir = opendir(path);
523 if (path[len-1] != '/')
525 while ((e = readdir(dir)) != NULL) {
528 if ((e->d_name[0] == '.') &&
529 ((e->d_name[1] == 0) ||
530 ((e->d_name[1] == '.') && e->d_name[2] == 0)))
531 continue; /* "." and ".." */
533 namlen = strlen(e->d_name);
534 if ((len + namlen < PATH_MAX) &&
535 strcpy(path + len, e->d_name) &&
537 S_ISDIR(st.st_mode) &&
538 !remove_empty_dir_recursive(path, len + namlen))
539 continue; /* happy */
541 /* path too long, stat fails, or non-directory still exists */
553 static int remove_empty_directories(char *file)
555 /* we want to create a file but there is a directory there;
556 * if that is an empty directory (or a directory that contains
557 * only empty directories), remove them.
560 int len = strlen(file);
562 if (len >= PATH_MAX) /* path too long ;-) */
565 return remove_empty_dir_recursive(path, len);
568 static int is_refname_available(const char *ref, const char *oldref,
569 struct ref_list *list, int quiet)
571 int namlen = strlen(ref); /* e.g. 'foo/bar' */
573 /* list->name could be 'foo' or 'foo/bar/baz' */
574 if (!oldref || strcmp(oldref, list->name)) {
575 int len = strlen(list->name);
576 int cmplen = (namlen < len) ? namlen : len;
577 const char *lead = (namlen < len) ? list->name : ref;
578 if (!strncmp(ref, list->name, cmplen) &&
579 lead[cmplen] == '/') {
581 error("'%s' exists; cannot create '%s'",
591 static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int *flag)
594 const char *orig_ref = ref;
595 struct ref_lock *lock;
598 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
600 lock = xcalloc(1, sizeof(struct ref_lock));
603 ref = resolve_ref(ref, lock->old_sha1, mustexist, flag);
604 if (!ref && errno == EISDIR) {
605 /* we are trying to lock foo but we used to
606 * have foo/bar which now does not exist;
607 * it is normal for the empty directory 'foo'
610 ref_file = git_path("%s", orig_ref);
611 if (remove_empty_directories(ref_file)) {
613 error("there are still refs under '%s'", orig_ref);
616 ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, flag);
620 error("unable to resolve reference %s: %s",
621 orig_ref, strerror(errno));
624 /* When the ref did not exist and we are creating it,
625 * make sure there is no existing ref that is packed
626 * whose name begins with our refname, nor a ref whose
627 * name is a proper prefix of our refname.
629 if (is_null_sha1(lock->old_sha1) &&
630 !is_refname_available(ref, NULL, get_packed_refs(), 0))
633 lock->lk = xcalloc(1, sizeof(struct lock_file));
635 lock->ref_name = xstrdup(ref);
636 lock->orig_ref_name = xstrdup(orig_ref);
637 ref_file = git_path("%s", ref);
638 lock->force_write = lstat(ref_file, &st) && errno == ENOENT;
640 if (safe_create_leading_directories(ref_file)) {
642 error("unable to create directory for %s", ref_file);
645 lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1);
647 return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
655 struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
657 char refpath[PATH_MAX];
658 if (check_ref_format(ref))
660 strcpy(refpath, mkpath("refs/%s", ref));
661 return lock_ref_sha1_basic(refpath, old_sha1, NULL);
664 struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1)
666 return lock_ref_sha1_basic(ref, old_sha1, NULL);
669 static struct lock_file packlock;
671 static int repack_without_ref(const char *refname)
673 struct ref_list *list, *packed_ref_list;
677 packed_ref_list = get_packed_refs();
678 for (list = packed_ref_list; list; list = list->next) {
679 if (!strcmp(refname, list->name)) {
686 fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
688 return error("cannot delete '%s' from packed refs", refname);
690 for (list = packed_ref_list; list; list = list->next) {
691 char line[PATH_MAX + 100];
694 if (!strcmp(refname, list->name))
696 len = snprintf(line, sizeof(line), "%s %s\n",
697 sha1_to_hex(list->sha1), list->name);
698 /* this should not happen but just being defensive */
699 if (len > sizeof(line))
700 die("too long a refname '%s'", list->name);
701 write_or_die(fd, line, len);
703 return commit_lock_file(&packlock);
706 int delete_ref(const char *refname, unsigned char *sha1)
708 struct ref_lock *lock;
709 int err, i, ret = 0, flag = 0;
711 lock = lock_ref_sha1_basic(refname, sha1, &flag);
714 if (!(flag & REF_ISPACKED)) {
716 i = strlen(lock->lk->filename) - 5; /* .lock */
717 lock->lk->filename[i] = 0;
718 err = unlink(lock->lk->filename);
721 error("unlink(%s) failed: %s",
722 lock->lk->filename, strerror(errno));
724 lock->lk->filename[i] = '.';
726 /* removing the loose one could have resurrected an earlier
727 * packed one. Also, if it was not loose we need to repack
730 ret |= repack_without_ref(refname);
732 err = unlink(git_path("logs/%s", lock->ref_name));
733 if (err && errno != ENOENT)
734 fprintf(stderr, "warning: unlink(%s) failed: %s",
735 git_path("logs/%s", lock->ref_name), strerror(errno));
736 invalidate_cached_refs();
741 int rename_ref(const char *oldref, const char *newref, const char *logmsg)
743 static const char renamed_ref[] = "RENAMED-REF";
744 unsigned char sha1[20], orig_sha1[20];
745 int flag = 0, logmoved = 0;
746 struct ref_lock *lock;
748 int log = !lstat(git_path("logs/%s", oldref), &loginfo);
750 if (S_ISLNK(loginfo.st_mode))
751 return error("reflog for %s is a symlink", oldref);
753 if (!resolve_ref(oldref, orig_sha1, 1, &flag))
754 return error("refname %s not found", oldref);
756 if (!is_refname_available(newref, oldref, get_packed_refs(), 0))
759 if (!is_refname_available(newref, oldref, get_loose_refs(), 0))
762 lock = lock_ref_sha1_basic(renamed_ref, NULL, NULL);
764 return error("unable to lock %s", renamed_ref);
765 lock->force_write = 1;
766 if (write_ref_sha1(lock, orig_sha1, logmsg))
767 return error("unable to save current sha1 in %s", renamed_ref);
769 if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log")))
770 return error("unable to move logfile logs/%s to tmp-renamed-log: %s",
771 oldref, strerror(errno));
773 if (delete_ref(oldref, orig_sha1)) {
774 error("unable to delete old %s", oldref);
778 if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1)) {
780 if (remove_empty_directories(git_path("%s", newref))) {
781 error("Directory not empty: %s", newref);
785 error("unable to delete existing %s", newref);
790 if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
791 error("unable to create directory for %s", newref);
796 if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) {
797 if (errno==EISDIR || errno==ENOTDIR) {
799 * rename(a, b) when b is an existing
800 * directory ought to result in ISDIR, but
801 * Solaris 5.8 gives ENOTDIR. Sheesh.
803 if (remove_empty_directories(git_path("logs/%s", newref))) {
804 error("Directory not empty: logs/%s", newref);
809 error("unable to move logfile tmp-renamed-log to logs/%s: %s",
810 newref, strerror(errno));
816 lock = lock_ref_sha1_basic(newref, NULL, NULL);
818 error("unable to lock %s for update", newref);
822 lock->force_write = 1;
823 hashcpy(lock->old_sha1, orig_sha1);
824 if (write_ref_sha1(lock, orig_sha1, logmsg)) {
825 error("unable to write current sha1 into %s", newref);
829 if (!strncmp(oldref, "refs/heads/", 11) &&
830 !strncmp(newref, "refs/heads/", 11)) {
831 char oldsection[1024], newsection[1024];
833 snprintf(oldsection, 1024, "branch.%s", oldref + 11);
834 snprintf(newsection, 1024, "branch.%s", newref + 11);
835 if (git_config_rename_section(oldsection, newsection) < 0)
842 lock = lock_ref_sha1_basic(oldref, NULL, NULL);
844 error("unable to lock %s for rollback", oldref);
848 lock->force_write = 1;
849 flag = log_all_ref_updates;
850 log_all_ref_updates = 0;
851 if (write_ref_sha1(lock, orig_sha1, NULL))
852 error("unable to write current sha1 into %s", oldref);
853 log_all_ref_updates = flag;
856 if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
857 error("unable to restore logfile %s from %s: %s",
858 oldref, newref, strerror(errno));
859 if (!logmoved && log &&
860 rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref)))
861 error("unable to restore logfile %s from tmp-renamed-log: %s",
862 oldref, strerror(errno));
867 void unlock_ref(struct ref_lock *lock)
869 if (lock->lock_fd >= 0) {
870 close(lock->lock_fd);
871 /* Do not free lock->lk -- atexit() still looks at them */
873 rollback_lock_file(lock->lk);
875 free(lock->ref_name);
876 free(lock->orig_ref_name);
880 static int log_ref_write(const char *ref_name, const unsigned char *old_sha1,
881 const unsigned char *new_sha1, const char *msg)
883 int logfd, written, oflags = O_APPEND | O_WRONLY;
884 unsigned maxlen, len;
886 char *log_file, *logrec;
887 const char *committer;
889 if (log_all_ref_updates < 0)
890 log_all_ref_updates = !is_bare_repository();
892 log_file = git_path("logs/%s", ref_name);
894 if (log_all_ref_updates &&
895 (!strncmp(ref_name, "refs/heads/", 11) ||
896 !strncmp(ref_name, "refs/remotes/", 13) ||
897 !strcmp(ref_name, "HEAD"))) {
898 if (safe_create_leading_directories(log_file) < 0)
899 return error("unable to create directory for %s",
904 logfd = open(log_file, oflags, 0666);
906 if (!(oflags & O_CREAT) && errno == ENOENT)
909 if ((oflags & O_CREAT) && errno == EISDIR) {
910 if (remove_empty_directories(log_file)) {
911 return error("There are still logs under '%s'",
914 logfd = open(log_file, oflags, 0666);
918 return error("Unable to append to %s: %s",
919 log_file, strerror(errno));
924 /* clean up the message and make sure it is a single line */
929 const char *ep = strchr(msg, '\n');
933 msglen = strlen(msg);
937 committer = git_committer_info(-1);
938 maxlen = strlen(committer) + msglen + 100;
939 logrec = xmalloc(maxlen);
940 len = sprintf(logrec, "%s %s %s\n",
941 sha1_to_hex(old_sha1),
942 sha1_to_hex(new_sha1),
945 len += sprintf(logrec + len - 1, "\t%.*s\n", msglen, msg) - 1;
946 written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
950 return error("Unable to append to %s", log_file);
954 int write_ref_sha1(struct ref_lock *lock,
955 const unsigned char *sha1, const char *logmsg)
957 static char term = '\n';
961 if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
965 if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
966 write_in_full(lock->lock_fd, &term, 1) != 1
967 || close(lock->lock_fd) < 0) {
968 error("Couldn't write %s", lock->lk->filename);
972 invalidate_cached_refs();
973 if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
974 (strcmp(lock->ref_name, lock->orig_ref_name) &&
975 log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
979 if (commit_lock_file(lock->lk)) {
980 error("Couldn't set %s", lock->ref_name);
989 int create_symref(const char *ref_target, const char *refs_heads_master,
992 const char *lockpath;
994 int fd, len, written;
995 char *git_HEAD = xstrdup(git_path("%s", ref_target));
996 unsigned char old_sha1[20], new_sha1[20];
998 if (logmsg && read_ref(ref_target, old_sha1))
1001 #ifndef NO_SYMLINK_HEAD
1002 if (prefer_symlink_refs) {
1004 if (!symlink(refs_heads_master, git_HEAD))
1006 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
1010 len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
1011 if (sizeof(ref) <= len) {
1012 error("refname too long: %s", refs_heads_master);
1013 goto error_free_return;
1015 lockpath = mkpath("%s.lock", git_HEAD);
1016 fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
1018 error("Unable to open %s for writing", lockpath);
1019 goto error_free_return;
1021 written = write_in_full(fd, ref, len);
1023 if (written != len) {
1024 error("Unable to write to %s", lockpath);
1025 goto error_unlink_return;
1027 if (rename(lockpath, git_HEAD) < 0) {
1028 error("Unable to create %s", git_HEAD);
1029 goto error_unlink_return;
1031 if (adjust_shared_perm(git_HEAD)) {
1032 error("Unable to fix permissions on %s", lockpath);
1033 error_unlink_return:
1041 if (logmsg && !read_ref(refs_heads_master, new_sha1))
1042 log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
1048 static char *ref_msg(const char *line, const char *endp)
1054 for (ep = line; ep < endp && *ep != '\n'; ep++)
1056 msg = xmalloc(ep - line + 1);
1057 memcpy(msg, line, ep - line);
1062 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)
1064 const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
1066 int logfd, tz, reccnt = 0;
1069 unsigned char logged_sha1[20];
1072 logfile = git_path("logs/%s", ref);
1073 logfd = open(logfile, O_RDONLY, 0);
1075 die("Unable to read log %s: %s", logfile, strerror(errno));
1078 die("Log %s is empty.", logfile);
1079 log_mapped = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, logfd, 0);
1080 logdata = log_mapped;
1084 rec = logend = logdata + st.st_size;
1085 while (logdata < rec) {
1087 if (logdata < rec && *(rec-1) == '\n')
1090 while (logdata < rec && *(rec-1) != '\n') {
1096 die("Log %s is corrupt.", logfile);
1097 date = strtoul(lastgt + 1, &tz_c, 10);
1098 if (date <= at_time || cnt == 0) {
1099 tz = strtoul(tz_c, NULL, 10);
1101 *msg = ref_msg(rec, logend);
1103 *cutoff_time = date;
1107 *cutoff_cnt = reccnt - 1;
1109 if (get_sha1_hex(lastrec, logged_sha1))
1110 die("Log %s is corrupt.", logfile);
1111 if (get_sha1_hex(rec + 41, sha1))
1112 die("Log %s is corrupt.", logfile);
1113 if (hashcmp(logged_sha1, sha1)) {
1115 "warning: Log %s has gap after %s.\n",
1116 logfile, show_rfc2822_date(date, tz));
1119 else if (date == at_time) {
1120 if (get_sha1_hex(rec + 41, sha1))
1121 die("Log %s is corrupt.", logfile);
1124 if (get_sha1_hex(rec + 41, logged_sha1))
1125 die("Log %s is corrupt.", logfile);
1126 if (hashcmp(logged_sha1, sha1)) {
1128 "warning: Log %s unexpectedly ended on %s.\n",
1129 logfile, show_rfc2822_date(date, tz));
1132 munmap(log_mapped, st.st_size);
1141 while (rec < logend && *rec != '>' && *rec != '\n')
1143 if (rec == logend || *rec == '\n')
1144 die("Log %s is corrupt.", logfile);
1145 date = strtoul(rec + 1, &tz_c, 10);
1146 tz = strtoul(tz_c, NULL, 10);
1147 if (get_sha1_hex(logdata, sha1))
1148 die("Log %s is corrupt.", logfile);
1150 *msg = ref_msg(logdata, logend);
1151 munmap(log_mapped, st.st_size);
1154 *cutoff_time = date;
1158 *cutoff_cnt = reccnt;
1162 int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data)
1164 const char *logfile;
1169 logfile = git_path("logs/%s", ref);
1170 logfp = fopen(logfile, "r");
1173 while (fgets(buf, sizeof(buf), logfp)) {
1174 unsigned char osha1[20], nsha1[20];
1175 char *email_end, *message;
1176 unsigned long timestamp;
1179 /* old SP new SP name <email> SP time TAB msg LF */
1181 if (len < 83 || buf[len-1] != '\n' ||
1182 get_sha1_hex(buf, osha1) || buf[40] != ' ' ||
1183 get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' ||
1184 !(email_end = strchr(buf + 82, '>')) ||
1185 email_end[1] != ' ' ||
1186 !(timestamp = strtoul(email_end + 2, &message, 10)) ||
1187 !message || message[0] != ' ' ||
1188 (message[1] != '+' && message[1] != '-') ||
1189 !isdigit(message[2]) || !isdigit(message[3]) ||
1190 !isdigit(message[4]) || !isdigit(message[5]) ||
1192 continue; /* corrupt? */
1193 email_end[1] = '\0';
1194 tz = strtol(message + 1, NULL, 10);
1196 ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data);