for_each_reflog_ent: do not leak FILE *
[git/git.git] / refs.c
1 #include "cache.h"
2 #include "refs.h"
3 #include "object.h"
4 #include "tag.h"
5
6 /* ISSYMREF=01 and ISPACKED=02 are public interfaces */
7 #define REF_KNOWS_PEELED 04
8
9 struct ref_list {
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];
15 };
16
17 static const char *parse_ref_line(char *line, unsigned char *sha1)
18 {
19 /*
20 * 42: the answer to everything.
21 *
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)
26 */
27 int len = strlen(line) - 42;
28
29 if (len <= 0)
30 return NULL;
31 if (get_sha1_hex(line, sha1) < 0)
32 return NULL;
33 if (!isspace(line[40]))
34 return NULL;
35 line += 41;
36 if (isspace(*line))
37 return NULL;
38 if (line[len] != '\n')
39 return NULL;
40 line[len] = 0;
41
42 return line;
43 }
44
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)
48 {
49 int len;
50 struct ref_list **p = &list, *entry;
51
52 /* Find the place to insert the ref into.. */
53 while ((entry = *p) != NULL) {
54 int cmp = strcmp(entry->name, name);
55 if (cmp > 0)
56 break;
57
58 /* Same as existing entry? */
59 if (!cmp) {
60 if (new_entry)
61 *new_entry = entry;
62 return list;
63 }
64 p = &entry->next;
65 }
66
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);
73 entry->flag = flag;
74 entry->next = *p;
75 *p = entry;
76 if (new_entry)
77 *new_entry = entry;
78 return list;
79 }
80
81 /*
82 * Future: need to be in "struct repository"
83 * when doing a full libification.
84 */
85 struct cached_refs {
86 char did_loose;
87 char did_packed;
88 struct ref_list *loose;
89 struct ref_list *packed;
90 } cached_refs;
91
92 static void free_ref_list(struct ref_list *list)
93 {
94 struct ref_list *next;
95 for ( ; list; list = next) {
96 next = list->next;
97 free(list);
98 }
99 }
100
101 static void invalidate_cached_refs(void)
102 {
103 struct cached_refs *ca = &cached_refs;
104
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;
111 }
112
113 static void read_packed_refs(FILE *f, struct cached_refs *cached_refs)
114 {
115 struct ref_list *list = NULL;
116 struct ref_list *last = NULL;
117 char refline[PATH_MAX];
118 int flag = REF_ISPACKED;
119
120 while (fgets(refline, sizeof(refline), f)) {
121 unsigned char sha1[20];
122 const char *name;
123 static const char header[] = "# pack-refs with:";
124
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 */
130 continue;
131 }
132
133 name = parse_ref_line(refline, sha1);
134 if (name) {
135 list = add_ref(name, sha1, flag, list, &last);
136 continue;
137 }
138 if (last &&
139 refline[0] == '^' &&
140 strlen(refline) == 42 &&
141 refline[41] == '\n' &&
142 !get_sha1_hex(refline + 1, sha1))
143 hashcpy(last->peeled, sha1);
144 }
145 cached_refs->packed = list;
146 }
147
148 static struct ref_list *get_packed_refs(void)
149 {
150 if (!cached_refs.did_packed) {
151 FILE *f = fopen(git_path("packed-refs"), "r");
152 cached_refs.packed = NULL;
153 if (f) {
154 read_packed_refs(f, &cached_refs);
155 fclose(f);
156 }
157 cached_refs.did_packed = 1;
158 }
159 return cached_refs.packed;
160 }
161
162 static struct ref_list *get_ref_dir(const char *base, struct ref_list *list)
163 {
164 DIR *dir = opendir(git_path("%s", base));
165
166 if (dir) {
167 struct dirent *de;
168 int baselen = strlen(base);
169 char *ref = xmalloc(baselen + 257);
170
171 memcpy(ref, base, baselen);
172 if (baselen && base[baselen-1] != '/')
173 ref[baselen++] = '/';
174
175 while ((de = readdir(dir)) != NULL) {
176 unsigned char sha1[20];
177 struct stat st;
178 int flag;
179 int namelen;
180
181 if (de->d_name[0] == '.')
182 continue;
183 namelen = strlen(de->d_name);
184 if (namelen > 255)
185 continue;
186 if (has_extension(de->d_name, ".lock"))
187 continue;
188 memcpy(ref + baselen, de->d_name, namelen+1);
189 if (stat(git_path("%s", ref), &st) < 0)
190 continue;
191 if (S_ISDIR(st.st_mode)) {
192 list = get_ref_dir(ref, list);
193 continue;
194 }
195 if (!resolve_ref(ref, sha1, 1, &flag)) {
196 error("%s points nowhere!", ref);
197 continue;
198 }
199 list = add_ref(ref, sha1, flag, list, NULL);
200 }
201 free(ref);
202 closedir(dir);
203 }
204 return list;
205 }
206
207 static struct ref_list *get_loose_refs(void)
208 {
209 if (!cached_refs.did_loose) {
210 cached_refs.loose = get_ref_dir("refs", NULL);
211 cached_refs.did_loose = 1;
212 }
213 return cached_refs.loose;
214 }
215
216 /* We allow "recursive" symbolic refs. Only within reason, though */
217 #define MAXDEPTH 5
218
219 const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
220 {
221 int depth = MAXDEPTH, len;
222 char buffer[256];
223 static char ref_buffer[256];
224
225 if (flag)
226 *flag = 0;
227
228 for (;;) {
229 const char *path = git_path("%s", ref);
230 struct stat st;
231 char *buf;
232 int fd;
233
234 if (--depth < 0)
235 return NULL;
236
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
242 * reading.
243 */
244 if (lstat(path, &st) < 0) {
245 struct ref_list *list = get_packed_refs();
246 while (list) {
247 if (!strcmp(ref, list->name)) {
248 hashcpy(sha1, list->sha1);
249 if (flag)
250 *flag |= REF_ISPACKED;
251 return ref;
252 }
253 list = list->next;
254 }
255 if (reading || errno != ENOENT)
256 return NULL;
257 hashclr(sha1);
258 return ref;
259 }
260
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)) {
265 buffer[len] = 0;
266 strcpy(ref_buffer, buffer);
267 ref = ref_buffer;
268 if (flag)
269 *flag |= REF_ISSYMREF;
270 continue;
271 }
272 }
273
274 /* Is it a directory? */
275 if (S_ISDIR(st.st_mode)) {
276 errno = EISDIR;
277 return NULL;
278 }
279
280 /*
281 * Anything else, just open it and try to use it as
282 * a ref
283 */
284 fd = open(path, O_RDONLY);
285 if (fd < 0)
286 return NULL;
287 len = read_in_full(fd, buffer, sizeof(buffer)-1);
288 close(fd);
289
290 /*
291 * Is it a symbolic ref?
292 */
293 if (len < 4 || memcmp("ref:", buffer, 4))
294 break;
295 buf = buffer + 4;
296 len -= 4;
297 while (len && isspace(*buf))
298 buf++, len--;
299 while (len && isspace(buf[len-1]))
300 len--;
301 buf[len] = 0;
302 memcpy(ref_buffer, buf, len + 1);
303 ref = ref_buffer;
304 if (flag)
305 *flag |= REF_ISSYMREF;
306 }
307 if (len < 40 || get_sha1_hex(buffer, sha1))
308 return NULL;
309 return ref;
310 }
311
312 int create_symref(const char *ref_target, const char *refs_heads_master)
313 {
314 const char *lockpath;
315 char ref[1000];
316 int fd, len, written;
317 const char *git_HEAD = git_path("%s", ref_target);
318
319 #ifndef NO_SYMLINK_HEAD
320 if (prefer_symlink_refs) {
321 unlink(git_HEAD);
322 if (!symlink(refs_heads_master, git_HEAD))
323 return 0;
324 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
325 }
326 #endif
327
328 len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
329 if (sizeof(ref) <= len) {
330 error("refname too long: %s", refs_heads_master);
331 return -1;
332 }
333 lockpath = mkpath("%s.lock", git_HEAD);
334 fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
335 written = write_in_full(fd, ref, len);
336 close(fd);
337 if (written != len) {
338 unlink(lockpath);
339 error("Unable to write to %s", lockpath);
340 return -2;
341 }
342 if (rename(lockpath, git_HEAD) < 0) {
343 unlink(lockpath);
344 error("Unable to create %s", git_HEAD);
345 return -3;
346 }
347 if (adjust_shared_perm(git_HEAD)) {
348 unlink(lockpath);
349 error("Unable to fix permissions on %s", lockpath);
350 return -4;
351 }
352 return 0;
353 }
354
355 int read_ref(const char *ref, unsigned char *sha1)
356 {
357 if (resolve_ref(ref, sha1, 1, NULL))
358 return 0;
359 return -1;
360 }
361
362 static int do_one_ref(const char *base, each_ref_fn fn, int trim,
363 void *cb_data, struct ref_list *entry)
364 {
365 if (strncmp(base, entry->name, trim))
366 return 0;
367 if (is_null_sha1(entry->sha1))
368 return 0;
369 if (!has_sha1_file(entry->sha1)) {
370 error("%s does not point to a valid object!", entry->name);
371 return 0;
372 }
373 return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
374 }
375
376 int peel_ref(const char *ref, unsigned char *sha1)
377 {
378 int flag;
379 unsigned char base[20];
380 struct object *o;
381
382 if (!resolve_ref(ref, base, 1, &flag))
383 return -1;
384
385 if ((flag & REF_ISPACKED)) {
386 struct ref_list *list = get_packed_refs();
387
388 while (list) {
389 if (!strcmp(list->name, ref)) {
390 if (list->flag & REF_KNOWS_PEELED) {
391 hashcpy(sha1, list->peeled);
392 return 0;
393 }
394 /* older pack-refs did not leave peeled ones */
395 break;
396 }
397 list = list->next;
398 }
399 }
400
401 /* fallback - callers should not call this for unpacked refs */
402 o = parse_object(base);
403 if (o->type == OBJ_TAG) {
404 o = deref_tag(o, ref, 0);
405 if (o) {
406 hashcpy(sha1, o->sha1);
407 return 0;
408 }
409 }
410 return -1;
411 }
412
413 static int do_for_each_ref(const char *base, each_ref_fn fn, int trim,
414 void *cb_data)
415 {
416 int retval;
417 struct ref_list *packed = get_packed_refs();
418 struct ref_list *loose = get_loose_refs();
419
420 while (packed && loose) {
421 struct ref_list *entry;
422 int cmp = strcmp(packed->name, loose->name);
423 if (!cmp) {
424 packed = packed->next;
425 continue;
426 }
427 if (cmp > 0) {
428 entry = loose;
429 loose = loose->next;
430 } else {
431 entry = packed;
432 packed = packed->next;
433 }
434 retval = do_one_ref(base, fn, trim, cb_data, entry);
435 if (retval)
436 return retval;
437 }
438
439 for (packed = packed ? packed : loose; packed; packed = packed->next) {
440 retval = do_one_ref(base, fn, trim, cb_data, packed);
441 if (retval)
442 return retval;
443 }
444 return 0;
445 }
446
447 int head_ref(each_ref_fn fn, void *cb_data)
448 {
449 unsigned char sha1[20];
450 int flag;
451
452 if (resolve_ref("HEAD", sha1, 1, &flag))
453 return fn("HEAD", sha1, flag, cb_data);
454 return 0;
455 }
456
457 int for_each_ref(each_ref_fn fn, void *cb_data)
458 {
459 return do_for_each_ref("refs/", fn, 0, cb_data);
460 }
461
462 int for_each_tag_ref(each_ref_fn fn, void *cb_data)
463 {
464 return do_for_each_ref("refs/tags/", fn, 10, cb_data);
465 }
466
467 int for_each_branch_ref(each_ref_fn fn, void *cb_data)
468 {
469 return do_for_each_ref("refs/heads/", fn, 11, cb_data);
470 }
471
472 int for_each_remote_ref(each_ref_fn fn, void *cb_data)
473 {
474 return do_for_each_ref("refs/remotes/", fn, 13, cb_data);
475 }
476
477 /* NEEDSWORK: This is only used by ssh-upload and it should go; the
478 * caller should do resolve_ref or read_ref like everybody else. Or
479 * maybe everybody else should use get_ref_sha1() instead of doing
480 * read_ref().
481 */
482 int get_ref_sha1(const char *ref, unsigned char *sha1)
483 {
484 if (check_ref_format(ref))
485 return -1;
486 return read_ref(mkpath("refs/%s", ref), sha1);
487 }
488
489 /*
490 * Make sure "ref" is something reasonable to have under ".git/refs/";
491 * We do not like it if:
492 *
493 * - any path component of it begins with ".", or
494 * - it has double dots "..", or
495 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
496 * - it ends with a "/".
497 */
498
499 static inline int bad_ref_char(int ch)
500 {
501 return (((unsigned) ch) <= ' ' ||
502 ch == '~' || ch == '^' || ch == ':' ||
503 /* 2.13 Pattern Matching Notation */
504 ch == '?' || ch == '*' || ch == '[');
505 }
506
507 int check_ref_format(const char *ref)
508 {
509 int ch, level;
510 const char *cp = ref;
511
512 level = 0;
513 while (1) {
514 while ((ch = *cp++) == '/')
515 ; /* tolerate duplicated slashes */
516 if (!ch)
517 return -1; /* should not end with slashes */
518
519 /* we are at the beginning of the path component */
520 if (ch == '.' || bad_ref_char(ch))
521 return -1;
522
523 /* scan the rest of the path component */
524 while ((ch = *cp++) != 0) {
525 if (bad_ref_char(ch))
526 return -1;
527 if (ch == '/')
528 break;
529 if (ch == '.' && *cp == '.')
530 return -1;
531 }
532 level++;
533 if (!ch) {
534 if (level < 2)
535 return -2; /* at least of form "heads/blah" */
536 return 0;
537 }
538 }
539 }
540
541 static struct ref_lock *verify_lock(struct ref_lock *lock,
542 const unsigned char *old_sha1, int mustexist)
543 {
544 if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
545 error("Can't verify ref %s", lock->ref_name);
546 unlock_ref(lock);
547 return NULL;
548 }
549 if (hashcmp(lock->old_sha1, old_sha1)) {
550 error("Ref %s is at %s but expected %s", lock->ref_name,
551 sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
552 unlock_ref(lock);
553 return NULL;
554 }
555 return lock;
556 }
557
558 static int remove_empty_dir_recursive(char *path, int len)
559 {
560 DIR *dir = opendir(path);
561 struct dirent *e;
562 int ret = 0;
563
564 if (!dir)
565 return -1;
566 if (path[len-1] != '/')
567 path[len++] = '/';
568 while ((e = readdir(dir)) != NULL) {
569 struct stat st;
570 int namlen;
571 if ((e->d_name[0] == '.') &&
572 ((e->d_name[1] == 0) ||
573 ((e->d_name[1] == '.') && e->d_name[2] == 0)))
574 continue; /* "." and ".." */
575
576 namlen = strlen(e->d_name);
577 if ((len + namlen < PATH_MAX) &&
578 strcpy(path + len, e->d_name) &&
579 !lstat(path, &st) &&
580 S_ISDIR(st.st_mode) &&
581 !remove_empty_dir_recursive(path, len + namlen))
582 continue; /* happy */
583
584 /* path too long, stat fails, or non-directory still exists */
585 ret = -1;
586 break;
587 }
588 closedir(dir);
589 if (!ret) {
590 path[len] = 0;
591 ret = rmdir(path);
592 }
593 return ret;
594 }
595
596 static int remove_empty_directories(char *file)
597 {
598 /* we want to create a file but there is a directory there;
599 * if that is an empty directory (or a directory that contains
600 * only empty directories), remove them.
601 */
602 char path[PATH_MAX];
603 int len = strlen(file);
604
605 if (len >= PATH_MAX) /* path too long ;-) */
606 return -1;
607 strcpy(path, file);
608 return remove_empty_dir_recursive(path, len);
609 }
610
611 static int is_refname_available(const char *ref, const char *oldref,
612 struct ref_list *list, int quiet)
613 {
614 int namlen = strlen(ref); /* e.g. 'foo/bar' */
615 while (list) {
616 /* list->name could be 'foo' or 'foo/bar/baz' */
617 if (!oldref || strcmp(oldref, list->name)) {
618 int len = strlen(list->name);
619 int cmplen = (namlen < len) ? namlen : len;
620 const char *lead = (namlen < len) ? list->name : ref;
621 if (!strncmp(ref, list->name, cmplen) &&
622 lead[cmplen] == '/') {
623 if (!quiet)
624 error("'%s' exists; cannot create '%s'",
625 list->name, ref);
626 return 0;
627 }
628 }
629 list = list->next;
630 }
631 return 1;
632 }
633
634 static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int *flag)
635 {
636 char *ref_file;
637 const char *orig_ref = ref;
638 struct ref_lock *lock;
639 struct stat st;
640 int last_errno = 0;
641 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
642
643 lock = xcalloc(1, sizeof(struct ref_lock));
644 lock->lock_fd = -1;
645
646 ref = resolve_ref(ref, lock->old_sha1, mustexist, flag);
647 if (!ref && errno == EISDIR) {
648 /* we are trying to lock foo but we used to
649 * have foo/bar which now does not exist;
650 * it is normal for the empty directory 'foo'
651 * to remain.
652 */
653 ref_file = git_path("%s", orig_ref);
654 if (remove_empty_directories(ref_file)) {
655 last_errno = errno;
656 error("there are still refs under '%s'", orig_ref);
657 goto error_return;
658 }
659 ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, flag);
660 }
661 if (!ref) {
662 last_errno = errno;
663 error("unable to resolve reference %s: %s",
664 orig_ref, strerror(errno));
665 goto error_return;
666 }
667 /* When the ref did not exist and we are creating it,
668 * make sure there is no existing ref that is packed
669 * whose name begins with our refname, nor a ref whose
670 * name is a proper prefix of our refname.
671 */
672 if (is_null_sha1(lock->old_sha1) &&
673 !is_refname_available(ref, NULL, get_packed_refs(), 0))
674 goto error_return;
675
676 lock->lk = xcalloc(1, sizeof(struct lock_file));
677
678 lock->ref_name = xstrdup(ref);
679 lock->log_file = xstrdup(git_path("logs/%s", ref));
680 ref_file = git_path("%s", ref);
681 lock->force_write = lstat(ref_file, &st) && errno == ENOENT;
682
683 if (safe_create_leading_directories(ref_file)) {
684 last_errno = errno;
685 error("unable to create directory for %s", ref_file);
686 goto error_return;
687 }
688 lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1);
689
690 return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
691
692 error_return:
693 unlock_ref(lock);
694 errno = last_errno;
695 return NULL;
696 }
697
698 struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
699 {
700 char refpath[PATH_MAX];
701 if (check_ref_format(ref))
702 return NULL;
703 strcpy(refpath, mkpath("refs/%s", ref));
704 return lock_ref_sha1_basic(refpath, old_sha1, NULL);
705 }
706
707 struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1)
708 {
709 return lock_ref_sha1_basic(ref, old_sha1, NULL);
710 }
711
712 static struct lock_file packlock;
713
714 static int repack_without_ref(const char *refname)
715 {
716 struct ref_list *list, *packed_ref_list;
717 int fd;
718 int found = 0;
719
720 packed_ref_list = get_packed_refs();
721 for (list = packed_ref_list; list; list = list->next) {
722 if (!strcmp(refname, list->name)) {
723 found = 1;
724 break;
725 }
726 }
727 if (!found)
728 return 0;
729 fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
730 if (fd < 0)
731 return error("cannot delete '%s' from packed refs", refname);
732
733 for (list = packed_ref_list; list; list = list->next) {
734 char line[PATH_MAX + 100];
735 int len;
736
737 if (!strcmp(refname, list->name))
738 continue;
739 len = snprintf(line, sizeof(line), "%s %s\n",
740 sha1_to_hex(list->sha1), list->name);
741 /* this should not happen but just being defensive */
742 if (len > sizeof(line))
743 die("too long a refname '%s'", list->name);
744 write_or_die(fd, line, len);
745 }
746 return commit_lock_file(&packlock);
747 }
748
749 int delete_ref(const char *refname, unsigned char *sha1)
750 {
751 struct ref_lock *lock;
752 int err, i, ret = 0, flag = 0;
753
754 lock = lock_ref_sha1_basic(refname, sha1, &flag);
755 if (!lock)
756 return 1;
757 if (!(flag & REF_ISPACKED)) {
758 /* loose */
759 i = strlen(lock->lk->filename) - 5; /* .lock */
760 lock->lk->filename[i] = 0;
761 err = unlink(lock->lk->filename);
762 if (err) {
763 ret = 1;
764 error("unlink(%s) failed: %s",
765 lock->lk->filename, strerror(errno));
766 }
767 lock->lk->filename[i] = '.';
768 }
769 /* removing the loose one could have resurrected an earlier
770 * packed one. Also, if it was not loose we need to repack
771 * without it.
772 */
773 ret |= repack_without_ref(refname);
774
775 err = unlink(lock->log_file);
776 if (err && errno != ENOENT)
777 fprintf(stderr, "warning: unlink(%s) failed: %s",
778 lock->log_file, strerror(errno));
779 invalidate_cached_refs();
780 unlock_ref(lock);
781 return ret;
782 }
783
784 int rename_ref(const char *oldref, const char *newref, const char *logmsg)
785 {
786 static const char renamed_ref[] = "RENAMED-REF";
787 unsigned char sha1[20], orig_sha1[20];
788 int flag = 0, logmoved = 0;
789 struct ref_lock *lock;
790 struct stat loginfo;
791 int log = !lstat(git_path("logs/%s", oldref), &loginfo);
792
793 if (S_ISLNK(loginfo.st_mode))
794 return error("reflog for %s is a symlink", oldref);
795
796 if (!resolve_ref(oldref, orig_sha1, 1, &flag))
797 return error("refname %s not found", oldref);
798
799 if (!is_refname_available(newref, oldref, get_packed_refs(), 0))
800 return 1;
801
802 if (!is_refname_available(newref, oldref, get_loose_refs(), 0))
803 return 1;
804
805 lock = lock_ref_sha1_basic(renamed_ref, NULL, NULL);
806 if (!lock)
807 return error("unable to lock %s", renamed_ref);
808 lock->force_write = 1;
809 if (write_ref_sha1(lock, orig_sha1, logmsg))
810 return error("unable to save current sha1 in %s", renamed_ref);
811
812 if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log")))
813 return error("unable to move logfile logs/%s to tmp-renamed-log: %s",
814 oldref, strerror(errno));
815
816 if (delete_ref(oldref, orig_sha1)) {
817 error("unable to delete old %s", oldref);
818 goto rollback;
819 }
820
821 if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1)) {
822 if (errno==EISDIR) {
823 if (remove_empty_directories(git_path("%s", newref))) {
824 error("Directory not empty: %s", newref);
825 goto rollback;
826 }
827 } else {
828 error("unable to delete existing %s", newref);
829 goto rollback;
830 }
831 }
832
833 if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
834 error("unable to create directory for %s", newref);
835 goto rollback;
836 }
837
838 retry:
839 if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) {
840 if (errno==EISDIR || errno==ENOTDIR) {
841 /*
842 * rename(a, b) when b is an existing
843 * directory ought to result in ISDIR, but
844 * Solaris 5.8 gives ENOTDIR. Sheesh.
845 */
846 if (remove_empty_directories(git_path("logs/%s", newref))) {
847 error("Directory not empty: logs/%s", newref);
848 goto rollback;
849 }
850 goto retry;
851 } else {
852 error("unable to move logfile tmp-renamed-log to logs/%s: %s",
853 newref, strerror(errno));
854 goto rollback;
855 }
856 }
857 logmoved = log;
858
859 lock = lock_ref_sha1_basic(newref, NULL, NULL);
860 if (!lock) {
861 error("unable to lock %s for update", newref);
862 goto rollback;
863 }
864
865 lock->force_write = 1;
866 hashcpy(lock->old_sha1, orig_sha1);
867 if (write_ref_sha1(lock, orig_sha1, logmsg)) {
868 error("unable to write current sha1 into %s", newref);
869 goto rollback;
870 }
871
872 if (!strncmp(oldref, "refs/heads/", 11) &&
873 !strncmp(newref, "refs/heads/", 11)) {
874 char oldsection[1024], newsection[1024];
875
876 snprintf(oldsection, 1024, "branch.%s", oldref + 11);
877 snprintf(newsection, 1024, "branch.%s", newref + 11);
878 if (git_config_rename_section(oldsection, newsection) < 0)
879 return 1;
880 }
881
882 return 0;
883
884 rollback:
885 lock = lock_ref_sha1_basic(oldref, NULL, NULL);
886 if (!lock) {
887 error("unable to lock %s for rollback", oldref);
888 goto rollbacklog;
889 }
890
891 lock->force_write = 1;
892 flag = log_all_ref_updates;
893 log_all_ref_updates = 0;
894 if (write_ref_sha1(lock, orig_sha1, NULL))
895 error("unable to write current sha1 into %s", oldref);
896 log_all_ref_updates = flag;
897
898 rollbacklog:
899 if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
900 error("unable to restore logfile %s from %s: %s",
901 oldref, newref, strerror(errno));
902 if (!logmoved && log &&
903 rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref)))
904 error("unable to restore logfile %s from tmp-renamed-log: %s",
905 oldref, strerror(errno));
906
907 return 1;
908 }
909
910 void unlock_ref(struct ref_lock *lock)
911 {
912 if (lock->lock_fd >= 0) {
913 close(lock->lock_fd);
914 /* Do not free lock->lk -- atexit() still looks at them */
915 if (lock->lk)
916 rollback_lock_file(lock->lk);
917 }
918 free(lock->ref_name);
919 free(lock->log_file);
920 free(lock);
921 }
922
923 static int log_ref_write(struct ref_lock *lock,
924 const unsigned char *sha1, const char *msg)
925 {
926 int logfd, written, oflags = O_APPEND | O_WRONLY;
927 unsigned maxlen, len;
928 char *logrec;
929 const char *committer;
930
931 if (log_all_ref_updates < 0)
932 log_all_ref_updates = !is_bare_repository();
933
934 if (log_all_ref_updates &&
935 (!strncmp(lock->ref_name, "refs/heads/", 11) ||
936 !strncmp(lock->ref_name, "refs/remotes/", 13))) {
937 if (safe_create_leading_directories(lock->log_file) < 0)
938 return error("unable to create directory for %s",
939 lock->log_file);
940 oflags |= O_CREAT;
941 }
942
943 logfd = open(lock->log_file, oflags, 0666);
944 if (logfd < 0) {
945 if (!(oflags & O_CREAT) && errno == ENOENT)
946 return 0;
947
948 if ((oflags & O_CREAT) && errno == EISDIR) {
949 if (remove_empty_directories(lock->log_file)) {
950 return error("There are still logs under '%s'",
951 lock->log_file);
952 }
953 logfd = open(lock->log_file, oflags, 0666);
954 }
955
956 if (logfd < 0)
957 return error("Unable to append to %s: %s",
958 lock->log_file, strerror(errno));
959 }
960
961 committer = git_committer_info(1);
962 if (msg) {
963 maxlen = strlen(committer) + strlen(msg) + 2*40 + 5;
964 logrec = xmalloc(maxlen);
965 len = snprintf(logrec, maxlen, "%s %s %s\t%s\n",
966 sha1_to_hex(lock->old_sha1),
967 sha1_to_hex(sha1),
968 committer,
969 msg);
970 }
971 else {
972 maxlen = strlen(committer) + 2*40 + 4;
973 logrec = xmalloc(maxlen);
974 len = snprintf(logrec, maxlen, "%s %s %s\n",
975 sha1_to_hex(lock->old_sha1),
976 sha1_to_hex(sha1),
977 committer);
978 }
979 written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
980 free(logrec);
981 close(logfd);
982 if (written != len)
983 return error("Unable to append to %s", lock->log_file);
984 return 0;
985 }
986
987 int write_ref_sha1(struct ref_lock *lock,
988 const unsigned char *sha1, const char *logmsg)
989 {
990 static char term = '\n';
991
992 if (!lock)
993 return -1;
994 if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
995 unlock_ref(lock);
996 return 0;
997 }
998 if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
999 write_in_full(lock->lock_fd, &term, 1) != 1
1000 || close(lock->lock_fd) < 0) {
1001 error("Couldn't write %s", lock->lk->filename);
1002 unlock_ref(lock);
1003 return -1;
1004 }
1005 invalidate_cached_refs();
1006 if (log_ref_write(lock, sha1, logmsg) < 0) {
1007 unlock_ref(lock);
1008 return -1;
1009 }
1010 if (commit_lock_file(lock->lk)) {
1011 error("Couldn't set %s", lock->ref_name);
1012 unlock_ref(lock);
1013 return -1;
1014 }
1015 lock->lock_fd = -1;
1016 unlock_ref(lock);
1017 return 0;
1018 }
1019
1020 int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *sha1)
1021 {
1022 const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
1023 char *tz_c;
1024 int logfd, tz, reccnt = 0;
1025 struct stat st;
1026 unsigned long date;
1027 unsigned char logged_sha1[20];
1028
1029 logfile = git_path("logs/%s", ref);
1030 logfd = open(logfile, O_RDONLY, 0);
1031 if (logfd < 0)
1032 die("Unable to read log %s: %s", logfile, strerror(errno));
1033 fstat(logfd, &st);
1034 if (!st.st_size)
1035 die("Log %s is empty.", logfile);
1036 logdata = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, logfd, 0);
1037 close(logfd);
1038
1039 lastrec = NULL;
1040 rec = logend = logdata + st.st_size;
1041 while (logdata < rec) {
1042 reccnt++;
1043 if (logdata < rec && *(rec-1) == '\n')
1044 rec--;
1045 lastgt = NULL;
1046 while (logdata < rec && *(rec-1) != '\n') {
1047 rec--;
1048 if (*rec == '>')
1049 lastgt = rec;
1050 }
1051 if (!lastgt)
1052 die("Log %s is corrupt.", logfile);
1053 date = strtoul(lastgt + 1, &tz_c, 10);
1054 if (date <= at_time || cnt == 0) {
1055 if (lastrec) {
1056 if (get_sha1_hex(lastrec, logged_sha1))
1057 die("Log %s is corrupt.", logfile);
1058 if (get_sha1_hex(rec + 41, sha1))
1059 die("Log %s is corrupt.", logfile);
1060 if (hashcmp(logged_sha1, sha1)) {
1061 tz = strtoul(tz_c, NULL, 10);
1062 fprintf(stderr,
1063 "warning: Log %s has gap after %s.\n",
1064 logfile, show_rfc2822_date(date, tz));
1065 }
1066 }
1067 else if (date == at_time) {
1068 if (get_sha1_hex(rec + 41, sha1))
1069 die("Log %s is corrupt.", logfile);
1070 }
1071 else {
1072 if (get_sha1_hex(rec + 41, logged_sha1))
1073 die("Log %s is corrupt.", logfile);
1074 if (hashcmp(logged_sha1, sha1)) {
1075 tz = strtoul(tz_c, NULL, 10);
1076 fprintf(stderr,
1077 "warning: Log %s unexpectedly ended on %s.\n",
1078 logfile, show_rfc2822_date(date, tz));
1079 }
1080 }
1081 munmap((void*)logdata, st.st_size);
1082 return 0;
1083 }
1084 lastrec = rec;
1085 if (cnt > 0)
1086 cnt--;
1087 }
1088
1089 rec = logdata;
1090 while (rec < logend && *rec != '>' && *rec != '\n')
1091 rec++;
1092 if (rec == logend || *rec == '\n')
1093 die("Log %s is corrupt.", logfile);
1094 date = strtoul(rec + 1, &tz_c, 10);
1095 tz = strtoul(tz_c, NULL, 10);
1096 if (get_sha1_hex(logdata, sha1))
1097 die("Log %s is corrupt.", logfile);
1098 munmap((void*)logdata, st.st_size);
1099 if (at_time)
1100 fprintf(stderr, "warning: Log %s only goes back to %s.\n",
1101 logfile, show_rfc2822_date(date, tz));
1102 else
1103 fprintf(stderr, "warning: Log %s only has %d entries.\n",
1104 logfile, reccnt);
1105 return 0;
1106 }
1107
1108 int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data)
1109 {
1110 const char *logfile;
1111 FILE *logfp;
1112 char buf[1024];
1113 int ret = 0;
1114
1115 logfile = git_path("logs/%s", ref);
1116 logfp = fopen(logfile, "r");
1117 if (!logfp)
1118 return -1;
1119 while (fgets(buf, sizeof(buf), logfp)) {
1120 unsigned char osha1[20], nsha1[20];
1121 char *email_end, *message;
1122 unsigned long timestamp;
1123 int len, tz;
1124
1125 /* old SP new SP name <email> SP time TAB msg LF */
1126 len = strlen(buf);
1127 if (len < 83 || buf[len-1] != '\n' ||
1128 get_sha1_hex(buf, osha1) || buf[40] != ' ' ||
1129 get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' ||
1130 !(email_end = strchr(buf + 82, '>')) ||
1131 email_end[1] != ' ' ||
1132 !(timestamp = strtoul(email_end + 2, &message, 10)) ||
1133 !message || message[0] != ' ' ||
1134 (message[1] != '+' && message[1] != '-') ||
1135 !isdigit(message[2]) || !isdigit(message[3]) ||
1136 !isdigit(message[4]) || !isdigit(message[5]) ||
1137 message[6] != '\t')
1138 continue; /* corrupt? */
1139 email_end[1] = '\0';
1140 tz = strtol(message + 1, NULL, 10);
1141 message += 7;
1142 ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data);
1143 if (ret)
1144 break;
1145 }
1146 fclose(logfp);
1147 return ret;
1148 }
1149