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 */
218 #define MAXREFLEN (1024)
220 static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result)
223 struct cached_refs refs;
224 struct ref_list *ref;
227 strcpy(name + pathlen, "packed-refs");
228 f = fopen(name, "r");
231 read_packed_refs(f, &refs);
236 if (!strcmp(ref->name, refname)) {
238 memcpy(result, ref->sha1, 20);
243 free_ref_list(refs.packed);
247 static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion)
249 int fd, len = strlen(refname);
250 char buffer[128], *p;
252 if (recursion > MAXDEPTH || len > MAXREFLEN)
254 memcpy(name + pathlen, refname, len+1);
255 fd = open(name, O_RDONLY);
257 return resolve_gitlink_packed_ref(name, pathlen, refname, result);
259 len = read(fd, buffer, sizeof(buffer)-1);
263 while (len && isspace(buffer[len-1]))
267 /* Was it a detached head or an old-fashioned symlink? */
268 if (!get_sha1_hex(buffer, result))
272 if (strncmp(buffer, "ref:", 4))
278 return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1);
281 int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result)
283 int len = strlen(path), retval;
286 while (len && path[len-1] == '/')
290 gitdir = xmalloc(len + MAXREFLEN + 8);
291 memcpy(gitdir, path, len);
292 memcpy(gitdir + len, "/.git/", 7);
294 retval = resolve_gitlink_ref_recursive(gitdir, len+6, refname, result, 0);
299 const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
301 int depth = MAXDEPTH, len;
303 static char ref_buffer[256];
309 const char *path = git_path("%s", ref);
317 /* Special case: non-existing file.
318 * Not having the refs/heads/new-branch is OK
319 * if we are writing into it, so is .git/HEAD
320 * that points at refs/heads/master still to be
321 * born. It is NOT OK if we are resolving for
324 if (lstat(path, &st) < 0) {
325 struct ref_list *list = get_packed_refs();
327 if (!strcmp(ref, list->name)) {
328 hashcpy(sha1, list->sha1);
330 *flag |= REF_ISPACKED;
335 if (reading || errno != ENOENT)
341 /* Follow "normalized" - ie "refs/.." symlinks by hand */
342 if (S_ISLNK(st.st_mode)) {
343 len = readlink(path, buffer, sizeof(buffer)-1);
344 if (len >= 5 && !memcmp("refs/", buffer, 5)) {
346 strcpy(ref_buffer, buffer);
349 *flag |= REF_ISSYMREF;
354 /* Is it a directory? */
355 if (S_ISDIR(st.st_mode)) {
361 * Anything else, just open it and try to use it as
364 fd = open(path, O_RDONLY);
367 len = read_in_full(fd, buffer, sizeof(buffer)-1);
371 * Is it a symbolic ref?
373 if (len < 4 || memcmp("ref:", buffer, 4))
377 while (len && isspace(*buf))
379 while (len && isspace(buf[len-1]))
382 memcpy(ref_buffer, buf, len + 1);
385 *flag |= REF_ISSYMREF;
387 if (len < 40 || get_sha1_hex(buffer, sha1))
392 int read_ref(const char *ref, unsigned char *sha1)
394 if (resolve_ref(ref, sha1, 1, NULL))
399 static int do_one_ref(const char *base, each_ref_fn fn, int trim,
400 void *cb_data, struct ref_list *entry)
402 if (strncmp(base, entry->name, trim))
404 if (is_null_sha1(entry->sha1))
406 if (!has_sha1_file(entry->sha1)) {
407 error("%s does not point to a valid object!", entry->name);
410 return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
413 int peel_ref(const char *ref, unsigned char *sha1)
416 unsigned char base[20];
419 if (!resolve_ref(ref, base, 1, &flag))
422 if ((flag & REF_ISPACKED)) {
423 struct ref_list *list = get_packed_refs();
426 if (!strcmp(list->name, ref)) {
427 if (list->flag & REF_KNOWS_PEELED) {
428 hashcpy(sha1, list->peeled);
431 /* older pack-refs did not leave peeled ones */
438 /* fallback - callers should not call this for unpacked refs */
439 o = parse_object(base);
440 if (o->type == OBJ_TAG) {
441 o = deref_tag(o, ref, 0);
443 hashcpy(sha1, o->sha1);
450 static int do_for_each_ref(const char *base, each_ref_fn fn, int trim,
454 struct ref_list *packed = get_packed_refs();
455 struct ref_list *loose = get_loose_refs();
457 while (packed && loose) {
458 struct ref_list *entry;
459 int cmp = strcmp(packed->name, loose->name);
461 packed = packed->next;
469 packed = packed->next;
471 retval = do_one_ref(base, fn, trim, cb_data, entry);
476 for (packed = packed ? packed : loose; packed; packed = packed->next) {
477 retval = do_one_ref(base, fn, trim, cb_data, packed);
484 int head_ref(each_ref_fn fn, void *cb_data)
486 unsigned char sha1[20];
489 if (resolve_ref("HEAD", sha1, 1, &flag))
490 return fn("HEAD", sha1, flag, cb_data);
494 int for_each_ref(each_ref_fn fn, void *cb_data)
496 return do_for_each_ref("refs/", fn, 0, cb_data);
499 int for_each_tag_ref(each_ref_fn fn, void *cb_data)
501 return do_for_each_ref("refs/tags/", fn, 10, cb_data);
504 int for_each_branch_ref(each_ref_fn fn, void *cb_data)
506 return do_for_each_ref("refs/heads/", fn, 11, cb_data);
509 int for_each_remote_ref(each_ref_fn fn, void *cb_data)
511 return do_for_each_ref("refs/remotes/", fn, 13, cb_data);
514 /* NEEDSWORK: This is only used by ssh-upload and it should go; the
515 * caller should do resolve_ref or read_ref like everybody else. Or
516 * maybe everybody else should use get_ref_sha1() instead of doing
519 int get_ref_sha1(const char *ref, unsigned char *sha1)
521 if (check_ref_format(ref))
523 return read_ref(mkpath("refs/%s", ref), sha1);
527 * Make sure "ref" is something reasonable to have under ".git/refs/";
528 * We do not like it if:
530 * - any path component of it begins with ".", or
531 * - it has double dots "..", or
532 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
533 * - it ends with a "/".
536 static inline int bad_ref_char(int ch)
538 return (((unsigned) ch) <= ' ' ||
539 ch == '~' || ch == '^' || ch == ':' ||
540 /* 2.13 Pattern Matching Notation */
541 ch == '?' || ch == '*' || ch == '[');
544 int check_ref_format(const char *ref)
547 const char *cp = ref;
551 while ((ch = *cp++) == '/')
552 ; /* tolerate duplicated slashes */
554 return -1; /* should not end with slashes */
556 /* we are at the beginning of the path component */
557 if (ch == '.' || bad_ref_char(ch))
560 /* scan the rest of the path component */
561 while ((ch = *cp++) != 0) {
562 if (bad_ref_char(ch))
566 if (ch == '.' && *cp == '.')
572 return -2; /* at least of form "heads/blah" */
578 static struct ref_lock *verify_lock(struct ref_lock *lock,
579 const unsigned char *old_sha1, int mustexist)
581 if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
582 error("Can't verify ref %s", lock->ref_name);
586 if (hashcmp(lock->old_sha1, old_sha1)) {
587 error("Ref %s is at %s but expected %s", lock->ref_name,
588 sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
595 static int remove_empty_dir_recursive(char *path, int len)
597 DIR *dir = opendir(path);
603 if (path[len-1] != '/')
605 while ((e = readdir(dir)) != NULL) {
608 if ((e->d_name[0] == '.') &&
609 ((e->d_name[1] == 0) ||
610 ((e->d_name[1] == '.') && e->d_name[2] == 0)))
611 continue; /* "." and ".." */
613 namlen = strlen(e->d_name);
614 if ((len + namlen < PATH_MAX) &&
615 strcpy(path + len, e->d_name) &&
617 S_ISDIR(st.st_mode) &&
618 !remove_empty_dir_recursive(path, len + namlen))
619 continue; /* happy */
621 /* path too long, stat fails, or non-directory still exists */
633 static int remove_empty_directories(char *file)
635 /* we want to create a file but there is a directory there;
636 * if that is an empty directory (or a directory that contains
637 * only empty directories), remove them.
640 int len = strlen(file);
642 if (len >= PATH_MAX) /* path too long ;-) */
645 return remove_empty_dir_recursive(path, len);
648 static int is_refname_available(const char *ref, const char *oldref,
649 struct ref_list *list, int quiet)
651 int namlen = strlen(ref); /* e.g. 'foo/bar' */
653 /* list->name could be 'foo' or 'foo/bar/baz' */
654 if (!oldref || strcmp(oldref, list->name)) {
655 int len = strlen(list->name);
656 int cmplen = (namlen < len) ? namlen : len;
657 const char *lead = (namlen < len) ? list->name : ref;
658 if (!strncmp(ref, list->name, cmplen) &&
659 lead[cmplen] == '/') {
661 error("'%s' exists; cannot create '%s'",
671 static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int *flag)
674 const char *orig_ref = ref;
675 struct ref_lock *lock;
678 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
680 lock = xcalloc(1, sizeof(struct ref_lock));
683 ref = resolve_ref(ref, lock->old_sha1, mustexist, flag);
684 if (!ref && errno == EISDIR) {
685 /* we are trying to lock foo but we used to
686 * have foo/bar which now does not exist;
687 * it is normal for the empty directory 'foo'
690 ref_file = git_path("%s", orig_ref);
691 if (remove_empty_directories(ref_file)) {
693 error("there are still refs under '%s'", orig_ref);
696 ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, flag);
700 error("unable to resolve reference %s: %s",
701 orig_ref, strerror(errno));
704 /* When the ref did not exist and we are creating it,
705 * make sure there is no existing ref that is packed
706 * whose name begins with our refname, nor a ref whose
707 * name is a proper prefix of our refname.
709 if (is_null_sha1(lock->old_sha1) &&
710 !is_refname_available(ref, NULL, get_packed_refs(), 0))
713 lock->lk = xcalloc(1, sizeof(struct lock_file));
715 lock->ref_name = xstrdup(ref);
716 lock->orig_ref_name = xstrdup(orig_ref);
717 ref_file = git_path("%s", ref);
718 lock->force_write = lstat(ref_file, &st) && errno == ENOENT;
720 if (safe_create_leading_directories(ref_file)) {
722 error("unable to create directory for %s", ref_file);
725 lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1);
727 return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
735 struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
737 char refpath[PATH_MAX];
738 if (check_ref_format(ref))
740 strcpy(refpath, mkpath("refs/%s", ref));
741 return lock_ref_sha1_basic(refpath, old_sha1, NULL);
744 struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1)
746 if (check_ref_format(ref) == -1)
748 return lock_ref_sha1_basic(ref, old_sha1, NULL);
751 static struct lock_file packlock;
753 static int repack_without_ref(const char *refname)
755 struct ref_list *list, *packed_ref_list;
759 packed_ref_list = get_packed_refs();
760 for (list = packed_ref_list; list; list = list->next) {
761 if (!strcmp(refname, list->name)) {
768 fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
770 return error("cannot delete '%s' from packed refs", refname);
772 for (list = packed_ref_list; list; list = list->next) {
773 char line[PATH_MAX + 100];
776 if (!strcmp(refname, list->name))
778 len = snprintf(line, sizeof(line), "%s %s\n",
779 sha1_to_hex(list->sha1), list->name);
780 /* this should not happen but just being defensive */
781 if (len > sizeof(line))
782 die("too long a refname '%s'", list->name);
783 write_or_die(fd, line, len);
785 return commit_lock_file(&packlock);
788 int delete_ref(const char *refname, unsigned char *sha1)
790 struct ref_lock *lock;
791 int err, i, ret = 0, flag = 0;
793 lock = lock_ref_sha1_basic(refname, sha1, &flag);
796 if (!(flag & REF_ISPACKED)) {
798 i = strlen(lock->lk->filename) - 5; /* .lock */
799 lock->lk->filename[i] = 0;
800 err = unlink(lock->lk->filename);
803 error("unlink(%s) failed: %s",
804 lock->lk->filename, strerror(errno));
806 lock->lk->filename[i] = '.';
808 /* removing the loose one could have resurrected an earlier
809 * packed one. Also, if it was not loose we need to repack
812 ret |= repack_without_ref(refname);
814 err = unlink(git_path("logs/%s", lock->ref_name));
815 if (err && errno != ENOENT)
816 fprintf(stderr, "warning: unlink(%s) failed: %s",
817 git_path("logs/%s", lock->ref_name), strerror(errno));
818 invalidate_cached_refs();
823 int rename_ref(const char *oldref, const char *newref, const char *logmsg)
825 static const char renamed_ref[] = "RENAMED-REF";
826 unsigned char sha1[20], orig_sha1[20];
827 int flag = 0, logmoved = 0;
828 struct ref_lock *lock;
830 int log = !lstat(git_path("logs/%s", oldref), &loginfo);
832 if (S_ISLNK(loginfo.st_mode))
833 return error("reflog for %s is a symlink", oldref);
835 if (!resolve_ref(oldref, orig_sha1, 1, &flag))
836 return error("refname %s not found", oldref);
838 if (!is_refname_available(newref, oldref, get_packed_refs(), 0))
841 if (!is_refname_available(newref, oldref, get_loose_refs(), 0))
844 lock = lock_ref_sha1_basic(renamed_ref, NULL, NULL);
846 return error("unable to lock %s", renamed_ref);
847 lock->force_write = 1;
848 if (write_ref_sha1(lock, orig_sha1, logmsg))
849 return error("unable to save current sha1 in %s", renamed_ref);
851 if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log")))
852 return error("unable to move logfile logs/%s to tmp-renamed-log: %s",
853 oldref, strerror(errno));
855 if (delete_ref(oldref, orig_sha1)) {
856 error("unable to delete old %s", oldref);
860 if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1)) {
862 if (remove_empty_directories(git_path("%s", newref))) {
863 error("Directory not empty: %s", newref);
867 error("unable to delete existing %s", newref);
872 if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
873 error("unable to create directory for %s", newref);
878 if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) {
879 if (errno==EISDIR || errno==ENOTDIR) {
881 * rename(a, b) when b is an existing
882 * directory ought to result in ISDIR, but
883 * Solaris 5.8 gives ENOTDIR. Sheesh.
885 if (remove_empty_directories(git_path("logs/%s", newref))) {
886 error("Directory not empty: logs/%s", newref);
891 error("unable to move logfile tmp-renamed-log to logs/%s: %s",
892 newref, strerror(errno));
898 lock = lock_ref_sha1_basic(newref, NULL, NULL);
900 error("unable to lock %s for update", newref);
904 lock->force_write = 1;
905 hashcpy(lock->old_sha1, orig_sha1);
906 if (write_ref_sha1(lock, orig_sha1, logmsg)) {
907 error("unable to write current sha1 into %s", newref);
914 lock = lock_ref_sha1_basic(oldref, NULL, NULL);
916 error("unable to lock %s for rollback", oldref);
920 lock->force_write = 1;
921 flag = log_all_ref_updates;
922 log_all_ref_updates = 0;
923 if (write_ref_sha1(lock, orig_sha1, NULL))
924 error("unable to write current sha1 into %s", oldref);
925 log_all_ref_updates = flag;
928 if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
929 error("unable to restore logfile %s from %s: %s",
930 oldref, newref, strerror(errno));
931 if (!logmoved && log &&
932 rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref)))
933 error("unable to restore logfile %s from tmp-renamed-log: %s",
934 oldref, strerror(errno));
939 void unlock_ref(struct ref_lock *lock)
941 if (lock->lock_fd >= 0) {
942 close(lock->lock_fd);
943 /* Do not free lock->lk -- atexit() still looks at them */
945 rollback_lock_file(lock->lk);
947 free(lock->ref_name);
948 free(lock->orig_ref_name);
952 static int log_ref_write(const char *ref_name, const unsigned char *old_sha1,
953 const unsigned char *new_sha1, const char *msg)
955 int logfd, written, oflags = O_APPEND | O_WRONLY;
956 unsigned maxlen, len;
958 char *log_file, *logrec;
959 const char *committer;
961 if (log_all_ref_updates < 0)
962 log_all_ref_updates = !is_bare_repository();
964 log_file = git_path("logs/%s", ref_name);
966 if (log_all_ref_updates &&
967 (!prefixcmp(ref_name, "refs/heads/") ||
968 !prefixcmp(ref_name, "refs/remotes/") ||
969 !strcmp(ref_name, "HEAD"))) {
970 if (safe_create_leading_directories(log_file) < 0)
971 return error("unable to create directory for %s",
976 logfd = open(log_file, oflags, 0666);
978 if (!(oflags & O_CREAT) && errno == ENOENT)
981 if ((oflags & O_CREAT) && errno == EISDIR) {
982 if (remove_empty_directories(log_file)) {
983 return error("There are still logs under '%s'",
986 logfd = open(log_file, oflags, 0666);
990 return error("Unable to append to %s: %s",
991 log_file, strerror(errno));
994 adjust_shared_perm(log_file);
998 /* clean up the message and make sure it is a single line */
1003 const char *ep = strchr(msg, '\n');
1007 msglen = strlen(msg);
1011 committer = git_committer_info(-1);
1012 maxlen = strlen(committer) + msglen + 100;
1013 logrec = xmalloc(maxlen);
1014 len = sprintf(logrec, "%s %s %s\n",
1015 sha1_to_hex(old_sha1),
1016 sha1_to_hex(new_sha1),
1019 len += sprintf(logrec + len - 1, "\t%.*s\n", msglen, msg) - 1;
1020 written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
1024 return error("Unable to append to %s", log_file);
1028 int write_ref_sha1(struct ref_lock *lock,
1029 const unsigned char *sha1, const char *logmsg)
1031 static char term = '\n';
1035 if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
1039 if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
1040 write_in_full(lock->lock_fd, &term, 1) != 1
1041 || close(lock->lock_fd) < 0) {
1042 error("Couldn't write %s", lock->lk->filename);
1046 invalidate_cached_refs();
1047 if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
1048 (strcmp(lock->ref_name, lock->orig_ref_name) &&
1049 log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
1053 if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
1055 * Special hack: If a branch is updated directly and HEAD
1056 * points to it (may happen on the remote side of a push
1057 * for example) then logically the HEAD reflog should be
1059 * A generic solution implies reverse symref information,
1060 * but finding all symrefs pointing to the given branch
1061 * would be rather costly for this rare event (the direct
1062 * update of a branch) to be worth it. So let's cheat and
1063 * check with HEAD only which should cover 99% of all usage
1064 * scenarios (even 100% of the default ones).
1066 unsigned char head_sha1[20];
1068 const char *head_ref;
1069 head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag);
1070 if (head_ref && (head_flag & REF_ISSYMREF) &&
1071 !strcmp(head_ref, lock->ref_name))
1072 log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
1074 if (commit_lock_file(lock->lk)) {
1075 error("Couldn't set %s", lock->ref_name);
1084 int create_symref(const char *ref_target, const char *refs_heads_master,
1087 const char *lockpath;
1089 int fd, len, written;
1090 char *git_HEAD = xstrdup(git_path("%s", ref_target));
1091 unsigned char old_sha1[20], new_sha1[20];
1093 if (logmsg && read_ref(ref_target, old_sha1))
1096 if (safe_create_leading_directories(git_HEAD) < 0)
1097 return error("unable to create directory for %s", git_HEAD);
1099 #ifndef NO_SYMLINK_HEAD
1100 if (prefer_symlink_refs) {
1102 if (!symlink(refs_heads_master, git_HEAD))
1104 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
1108 len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
1109 if (sizeof(ref) <= len) {
1110 error("refname too long: %s", refs_heads_master);
1111 goto error_free_return;
1113 lockpath = mkpath("%s.lock", git_HEAD);
1114 fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
1116 error("Unable to open %s for writing", lockpath);
1117 goto error_free_return;
1119 written = write_in_full(fd, ref, len);
1121 if (written != len) {
1122 error("Unable to write to %s", lockpath);
1123 goto error_unlink_return;
1125 if (rename(lockpath, git_HEAD) < 0) {
1126 error("Unable to create %s", git_HEAD);
1127 goto error_unlink_return;
1129 if (adjust_shared_perm(git_HEAD)) {
1130 error("Unable to fix permissions on %s", lockpath);
1131 error_unlink_return:
1138 #ifndef NO_SYMLINK_HEAD
1141 if (logmsg && !read_ref(refs_heads_master, new_sha1))
1142 log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
1148 static char *ref_msg(const char *line, const char *endp)
1154 for (ep = line; ep < endp && *ep != '\n'; ep++)
1156 msg = xmalloc(ep - line + 1);
1157 memcpy(msg, line, ep - line);
1162 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)
1164 const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
1166 int logfd, tz, reccnt = 0;
1169 unsigned char logged_sha1[20];
1173 logfile = git_path("logs/%s", ref);
1174 logfd = open(logfile, O_RDONLY, 0);
1176 die("Unable to read log %s: %s", logfile, strerror(errno));
1179 die("Log %s is empty.", logfile);
1180 mapsz = xsize_t(st.st_size);
1181 log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
1182 logdata = log_mapped;
1186 rec = logend = logdata + st.st_size;
1187 while (logdata < rec) {
1189 if (logdata < rec && *(rec-1) == '\n')
1192 while (logdata < rec && *(rec-1) != '\n') {
1198 die("Log %s is corrupt.", logfile);
1199 date = strtoul(lastgt + 1, &tz_c, 10);
1200 if (date <= at_time || cnt == 0) {
1201 tz = strtoul(tz_c, NULL, 10);
1203 *msg = ref_msg(rec, logend);
1205 *cutoff_time = date;
1209 *cutoff_cnt = reccnt - 1;
1211 if (get_sha1_hex(lastrec, logged_sha1))
1212 die("Log %s is corrupt.", logfile);
1213 if (get_sha1_hex(rec + 41, sha1))
1214 die("Log %s is corrupt.", logfile);
1215 if (hashcmp(logged_sha1, sha1)) {
1217 "warning: Log %s has gap after %s.\n",
1218 logfile, show_rfc2822_date(date, tz));
1221 else if (date == at_time) {
1222 if (get_sha1_hex(rec + 41, sha1))
1223 die("Log %s is corrupt.", logfile);
1226 if (get_sha1_hex(rec + 41, logged_sha1))
1227 die("Log %s is corrupt.", logfile);
1228 if (hashcmp(logged_sha1, sha1)) {
1230 "warning: Log %s unexpectedly ended on %s.\n",
1231 logfile, show_rfc2822_date(date, tz));
1234 munmap(log_mapped, mapsz);
1243 while (rec < logend && *rec != '>' && *rec != '\n')
1245 if (rec == logend || *rec == '\n')
1246 die("Log %s is corrupt.", logfile);
1247 date = strtoul(rec + 1, &tz_c, 10);
1248 tz = strtoul(tz_c, NULL, 10);
1249 if (get_sha1_hex(logdata, sha1))
1250 die("Log %s is corrupt.", logfile);
1252 *msg = ref_msg(logdata, logend);
1253 munmap(log_mapped, mapsz);
1256 *cutoff_time = date;
1260 *cutoff_cnt = reccnt;
1264 int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data)
1266 const char *logfile;
1271 logfile = git_path("logs/%s", ref);
1272 logfp = fopen(logfile, "r");
1275 while (fgets(buf, sizeof(buf), logfp)) {
1276 unsigned char osha1[20], nsha1[20];
1277 char *email_end, *message;
1278 unsigned long timestamp;
1281 /* old SP new SP name <email> SP time TAB msg LF */
1283 if (len < 83 || buf[len-1] != '\n' ||
1284 get_sha1_hex(buf, osha1) || buf[40] != ' ' ||
1285 get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' ||
1286 !(email_end = strchr(buf + 82, '>')) ||
1287 email_end[1] != ' ' ||
1288 !(timestamp = strtoul(email_end + 2, &message, 10)) ||
1289 !message || message[0] != ' ' ||
1290 (message[1] != '+' && message[1] != '-') ||
1291 !isdigit(message[2]) || !isdigit(message[3]) ||
1292 !isdigit(message[4]) || !isdigit(message[5]))
1293 continue; /* corrupt? */
1294 email_end[1] = '\0';
1295 tz = strtol(message + 1, NULL, 10);
1296 if (message[6] != '\t')
1300 ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data);
1308 static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data)
1310 DIR *dir = opendir(git_path("logs/%s", base));
1315 int baselen = strlen(base);
1316 char *log = xmalloc(baselen + 257);
1318 memcpy(log, base, baselen);
1319 if (baselen && base[baselen-1] != '/')
1320 log[baselen++] = '/';
1322 while ((de = readdir(dir)) != NULL) {
1326 if (de->d_name[0] == '.')
1328 namelen = strlen(de->d_name);
1331 if (has_extension(de->d_name, ".lock"))
1333 memcpy(log + baselen, de->d_name, namelen+1);
1334 if (stat(git_path("logs/%s", log), &st) < 0)
1336 if (S_ISDIR(st.st_mode)) {
1337 retval = do_for_each_reflog(log, fn, cb_data);
1339 unsigned char sha1[20];
1340 if (!resolve_ref(log, sha1, 0, NULL))
1341 retval = error("bad ref for %s", log);
1343 retval = fn(log, sha1, 0, cb_data);
1356 int for_each_reflog(each_ref_fn fn, void *cb_data)
1358 return do_for_each_reflog("", fn, cb_data);