packed-backend: rip out some now-unused code
[git/git.git] / refs / files-backend.c
CommitLineData
7bd9bcf3 1#include "../cache.h"
b2141fc1 2#include "../config.h"
7bd9bcf3
MH
3#include "../refs.h"
4#include "refs-internal.h"
958f9646 5#include "ref-cache.h"
67be7c5a 6#include "packed-backend.h"
3bc581b9 7#include "../iterator.h"
2880d16f 8#include "../dir-iterator.h"
7bd9bcf3
MH
9#include "../lockfile.h"
10#include "../object.h"
11#include "../dir.h"
12
13struct ref_lock {
14 char *ref_name;
7bd9bcf3
MH
15 struct lock_file *lk;
16 struct object_id old_oid;
17};
18
7bd9bcf3
MH
19/*
20 * Future: need to be in "struct repository"
21 * when doing a full libification.
22 */
00eebe35
MH
23struct files_ref_store {
24 struct ref_store base;
9e7ec634 25 unsigned int store_flags;
32c597e7 26
f57f37e2
NTND
27 char *gitdir;
28 char *gitcommondir;
33dfb9f3 29
7c22bc8a 30 struct ref_cache *loose;
55c6bc37 31
e0cc8ac8 32 struct ref_store *packed_ref_store;
00eebe35 33};
7bd9bcf3 34
65a0a8e5 35static void clear_loose_ref_cache(struct files_ref_store *refs)
7bd9bcf3
MH
36{
37 if (refs->loose) {
7c22bc8a 38 free_ref_cache(refs->loose);
7bd9bcf3
MH
39 refs->loose = NULL;
40 }
41}
42
a2d5156c
JK
43/*
44 * Create a new submodule ref cache and add it to the internal
45 * set of caches.
46 */
9e7ec634
NTND
47static struct ref_store *files_ref_store_create(const char *gitdir,
48 unsigned int flags)
7bd9bcf3 49{
00eebe35
MH
50 struct files_ref_store *refs = xcalloc(1, sizeof(*refs));
51 struct ref_store *ref_store = (struct ref_store *)refs;
f57f37e2 52 struct strbuf sb = STRBUF_INIT;
7bd9bcf3 53
fbfd0a29 54 base_ref_store_init(ref_store, &refs_be_files);
9e7ec634 55 refs->store_flags = flags;
7bd9bcf3 56
f57f37e2
NTND
57 refs->gitdir = xstrdup(gitdir);
58 get_common_dir_noenv(&sb, gitdir);
59 refs->gitcommondir = strbuf_detach(&sb, NULL);
60 strbuf_addf(&sb, "%s/packed-refs", refs->gitcommondir);
e0d48397
MH
61 refs->packed_ref_store = packed_ref_store_create(sb.buf, flags);
62 strbuf_release(&sb);
7bd9bcf3 63
00eebe35 64 return ref_store;
a2d5156c 65}
7bd9bcf3 66
32c597e7 67/*
9e7ec634
NTND
68 * Die if refs is not the main ref store. caller is used in any
69 * necessary error messages.
32c597e7
MH
70 */
71static void files_assert_main_repository(struct files_ref_store *refs,
72 const char *caller)
73{
9e7ec634
NTND
74 if (refs->store_flags & REF_STORE_MAIN)
75 return;
76
77 die("BUG: operation %s only allowed for main ref store", caller);
32c597e7
MH
78}
79
a2d5156c 80/*
00eebe35 81 * Downcast ref_store to files_ref_store. Die if ref_store is not a
9e7ec634
NTND
82 * files_ref_store. required_flags is compared with ref_store's
83 * store_flags to ensure the ref_store has all required capabilities.
84 * "caller" is used in any necessary error messages.
a2d5156c 85 */
9e7ec634
NTND
86static struct files_ref_store *files_downcast(struct ref_store *ref_store,
87 unsigned int required_flags,
88 const char *caller)
a2d5156c 89{
32c597e7
MH
90 struct files_ref_store *refs;
91
00eebe35
MH
92 if (ref_store->be != &refs_be_files)
93 die("BUG: ref_store is type \"%s\" not \"files\" in %s",
94 ref_store->be->name, caller);
2eed2780 95
32c597e7
MH
96 refs = (struct files_ref_store *)ref_store;
97
9e7ec634
NTND
98 if ((refs->store_flags & required_flags) != required_flags)
99 die("BUG: operation %s requires abilities 0x%x, but only have 0x%x",
100 caller, required_flags, refs->store_flags);
2eed2780 101
32c597e7 102 return refs;
7bd9bcf3
MH
103}
104
802de3da
NTND
105static void files_reflog_path(struct files_ref_store *refs,
106 struct strbuf *sb,
107 const char *refname)
108{
109 if (!refname) {
f57f37e2
NTND
110 /*
111 * FIXME: of course this is wrong in multi worktree
112 * setting. To be fixed real soon.
113 */
114 strbuf_addf(sb, "%s/logs", refs->gitcommondir);
802de3da
NTND
115 return;
116 }
117
f57f37e2
NTND
118 switch (ref_type(refname)) {
119 case REF_TYPE_PER_WORKTREE:
120 case REF_TYPE_PSEUDOREF:
121 strbuf_addf(sb, "%s/logs/%s", refs->gitdir, refname);
122 break;
123 case REF_TYPE_NORMAL:
124 strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir, refname);
125 break;
126 default:
127 die("BUG: unknown ref type %d of ref %s",
128 ref_type(refname), refname);
129 }
802de3da
NTND
130}
131
19e02f4f
NTND
132static void files_ref_path(struct files_ref_store *refs,
133 struct strbuf *sb,
134 const char *refname)
135{
f57f37e2
NTND
136 switch (ref_type(refname)) {
137 case REF_TYPE_PER_WORKTREE:
138 case REF_TYPE_PSEUDOREF:
139 strbuf_addf(sb, "%s/%s", refs->gitdir, refname);
140 break;
141 case REF_TYPE_NORMAL:
142 strbuf_addf(sb, "%s/%s", refs->gitcommondir, refname);
143 break;
144 default:
145 die("BUG: unknown ref type %d of ref %s",
146 ref_type(refname), refname);
147 }
19e02f4f
NTND
148}
149
7bd9bcf3
MH
150/*
151 * Read the loose references from the namespace dirname into dir
152 * (without recursing). dirname must end with '/'. dir must be the
153 * directory entry corresponding to dirname.
154 */
df308759
MH
155static void loose_fill_ref_dir(struct ref_store *ref_store,
156 struct ref_dir *dir, const char *dirname)
7bd9bcf3 157{
df308759
MH
158 struct files_ref_store *refs =
159 files_downcast(ref_store, REF_STORE_READ, "fill_ref_dir");
7bd9bcf3
MH
160 DIR *d;
161 struct dirent *de;
162 int dirnamelen = strlen(dirname);
163 struct strbuf refname;
164 struct strbuf path = STRBUF_INIT;
165 size_t path_baselen;
166
19e02f4f 167 files_ref_path(refs, &path, dirname);
7bd9bcf3
MH
168 path_baselen = path.len;
169
170 d = opendir(path.buf);
171 if (!d) {
172 strbuf_release(&path);
173 return;
174 }
175
176 strbuf_init(&refname, dirnamelen + 257);
177 strbuf_add(&refname, dirname, dirnamelen);
178
179 while ((de = readdir(d)) != NULL) {
4417df8c 180 struct object_id oid;
7bd9bcf3
MH
181 struct stat st;
182 int flag;
183
184 if (de->d_name[0] == '.')
185 continue;
186 if (ends_with(de->d_name, ".lock"))
187 continue;
188 strbuf_addstr(&refname, de->d_name);
189 strbuf_addstr(&path, de->d_name);
190 if (stat(path.buf, &st) < 0) {
191 ; /* silently ignore */
192 } else if (S_ISDIR(st.st_mode)) {
193 strbuf_addch(&refname, '/');
194 add_entry_to_dir(dir,
e00d1a4f 195 create_dir_entry(dir->cache, refname.buf,
7bd9bcf3
MH
196 refname.len, 1));
197 } else {
7d2df051 198 if (!refs_resolve_ref_unsafe(&refs->base,
3c0cb0cb
MH
199 refname.buf,
200 RESOLVE_REF_READING,
4417df8c 201 oid.hash, &flag)) {
202 oidclr(&oid);
7bd9bcf3 203 flag |= REF_ISBROKEN;
4417df8c 204 } else if (is_null_oid(&oid)) {
7bd9bcf3
MH
205 /*
206 * It is so astronomically unlikely
207 * that NULL_SHA1 is the SHA-1 of an
208 * actual object that we consider its
209 * appearance in a loose reference
210 * file to be repo corruption
211 * (probably due to a software bug).
212 */
213 flag |= REF_ISBROKEN;
214 }
215
216 if (check_refname_format(refname.buf,
217 REFNAME_ALLOW_ONELEVEL)) {
218 if (!refname_is_safe(refname.buf))
219 die("loose refname is dangerous: %s", refname.buf);
4417df8c 220 oidclr(&oid);
7bd9bcf3
MH
221 flag |= REF_BAD_NAME | REF_ISBROKEN;
222 }
223 add_entry_to_dir(dir,
c1da06c6 224 create_ref_entry(refname.buf, &oid, flag));
7bd9bcf3
MH
225 }
226 strbuf_setlen(&refname, dirnamelen);
227 strbuf_setlen(&path, path_baselen);
228 }
229 strbuf_release(&refname);
230 strbuf_release(&path);
231 closedir(d);
e3bf2989
MH
232
233 /*
234 * Manually add refs/bisect, which, being per-worktree, might
235 * not appear in the directory listing for refs/ in the main
236 * repo.
237 */
238 if (!strcmp(dirname, "refs/")) {
239 int pos = search_ref_dir(dir, "refs/bisect/", 12);
240
241 if (pos < 0) {
242 struct ref_entry *child_entry = create_dir_entry(
243 dir->cache, "refs/bisect/", 12, 1);
244 add_entry_to_dir(dir, child_entry);
245 }
246 }
7bd9bcf3
MH
247}
248
a714b19c 249static struct ref_cache *get_loose_ref_cache(struct files_ref_store *refs)
7bd9bcf3
MH
250{
251 if (!refs->loose) {
252 /*
253 * Mark the top-level directory complete because we
254 * are about to read the only subdirectory that can
255 * hold references:
256 */
df308759 257 refs->loose = create_ref_cache(&refs->base, loose_fill_ref_dir);
7c22bc8a
MH
258
259 /* We're going to fill the top level ourselves: */
260 refs->loose->root->flag &= ~REF_INCOMPLETE;
261
7bd9bcf3 262 /*
7c22bc8a
MH
263 * Add an incomplete entry for "refs/" (to be filled
264 * lazily):
7bd9bcf3 265 */
7c22bc8a 266 add_entry_to_dir(get_ref_dir(refs->loose->root),
e00d1a4f 267 create_dir_entry(refs->loose, "refs/", 5, 1));
7bd9bcf3 268 }
a714b19c 269 return refs->loose;
7bd9bcf3
MH
270}
271
e1e33b72
MH
272static int files_read_raw_ref(struct ref_store *ref_store,
273 const char *refname, unsigned char *sha1,
274 struct strbuf *referent, unsigned int *type)
7bd9bcf3 275{
4308651c 276 struct files_ref_store *refs =
9e7ec634 277 files_downcast(ref_store, REF_STORE_READ, "read_raw_ref");
42a38cf7
MH
278 struct strbuf sb_contents = STRBUF_INIT;
279 struct strbuf sb_path = STRBUF_INIT;
7048653a
DT
280 const char *path;
281 const char *buf;
282 struct stat st;
283 int fd;
42a38cf7
MH
284 int ret = -1;
285 int save_errno;
e8c42cb9 286 int remaining_retries = 3;
7bd9bcf3 287
fa96ea1b 288 *type = 0;
42a38cf7 289 strbuf_reset(&sb_path);
34c7ad8f 290
19e02f4f 291 files_ref_path(refs, &sb_path, refname);
34c7ad8f 292
42a38cf7 293 path = sb_path.buf;
7bd9bcf3 294
7048653a
DT
295stat_ref:
296 /*
297 * We might have to loop back here to avoid a race
298 * condition: first we lstat() the file, then we try
299 * to read it as a link or as a file. But if somebody
300 * changes the type of the file (file <-> directory
301 * <-> symlink) between the lstat() and reading, then
302 * we don't want to report that as an error but rather
303 * try again starting with the lstat().
e8c42cb9
JK
304 *
305 * We'll keep a count of the retries, though, just to avoid
306 * any confusing situation sending us into an infinite loop.
7048653a 307 */
7bd9bcf3 308
e8c42cb9
JK
309 if (remaining_retries-- <= 0)
310 goto out;
311
7048653a
DT
312 if (lstat(path, &st) < 0) {
313 if (errno != ENOENT)
42a38cf7 314 goto out;
e0cc8ac8
MH
315 if (refs_read_raw_ref(refs->packed_ref_store, refname,
316 sha1, referent, type)) {
7048653a 317 errno = ENOENT;
42a38cf7 318 goto out;
7bd9bcf3 319 }
42a38cf7
MH
320 ret = 0;
321 goto out;
7bd9bcf3 322 }
7bd9bcf3 323
7048653a
DT
324 /* Follow "normalized" - ie "refs/.." symlinks by hand */
325 if (S_ISLNK(st.st_mode)) {
42a38cf7
MH
326 strbuf_reset(&sb_contents);
327 if (strbuf_readlink(&sb_contents, path, 0) < 0) {
7048653a 328 if (errno == ENOENT || errno == EINVAL)
7bd9bcf3
MH
329 /* inconsistent with lstat; retry */
330 goto stat_ref;
331 else
42a38cf7 332 goto out;
7bd9bcf3 333 }
42a38cf7
MH
334 if (starts_with(sb_contents.buf, "refs/") &&
335 !check_refname_format(sb_contents.buf, 0)) {
92b38093 336 strbuf_swap(&sb_contents, referent);
3a0b6b9a 337 *type |= REF_ISSYMREF;
42a38cf7
MH
338 ret = 0;
339 goto out;
7bd9bcf3 340 }
3f7bd767
JK
341 /*
342 * It doesn't look like a refname; fall through to just
343 * treating it like a non-symlink, and reading whatever it
344 * points to.
345 */
7048653a 346 }
7bd9bcf3 347
7048653a
DT
348 /* Is it a directory? */
349 if (S_ISDIR(st.st_mode)) {
e167a567
MH
350 /*
351 * Even though there is a directory where the loose
352 * ref is supposed to be, there could still be a
353 * packed ref:
354 */
e0cc8ac8
MH
355 if (refs_read_raw_ref(refs->packed_ref_store, refname,
356 sha1, referent, type)) {
e167a567
MH
357 errno = EISDIR;
358 goto out;
359 }
360 ret = 0;
42a38cf7 361 goto out;
7048653a
DT
362 }
363
364 /*
365 * Anything else, just open it and try to use it as
366 * a ref
367 */
368 fd = open(path, O_RDONLY);
369 if (fd < 0) {
3f7bd767 370 if (errno == ENOENT && !S_ISLNK(st.st_mode))
7048653a
DT
371 /* inconsistent with lstat; retry */
372 goto stat_ref;
373 else
42a38cf7 374 goto out;
7048653a 375 }
42a38cf7
MH
376 strbuf_reset(&sb_contents);
377 if (strbuf_read(&sb_contents, fd, 256) < 0) {
7048653a
DT
378 int save_errno = errno;
379 close(fd);
380 errno = save_errno;
42a38cf7 381 goto out;
7048653a
DT
382 }
383 close(fd);
42a38cf7
MH
384 strbuf_rtrim(&sb_contents);
385 buf = sb_contents.buf;
7048653a
DT
386 if (starts_with(buf, "ref:")) {
387 buf += 4;
7bd9bcf3
MH
388 while (isspace(*buf))
389 buf++;
7048653a 390
92b38093
MH
391 strbuf_reset(referent);
392 strbuf_addstr(referent, buf);
3a0b6b9a 393 *type |= REF_ISSYMREF;
42a38cf7
MH
394 ret = 0;
395 goto out;
7bd9bcf3 396 }
7bd9bcf3 397
7048653a
DT
398 /*
399 * Please note that FETCH_HEAD has additional
400 * data after the sha.
401 */
402 if (get_sha1_hex(buf, sha1) ||
403 (buf[40] != '\0' && !isspace(buf[40]))) {
3a0b6b9a 404 *type |= REF_ISBROKEN;
7048653a 405 errno = EINVAL;
42a38cf7 406 goto out;
7048653a
DT
407 }
408
42a38cf7 409 ret = 0;
7bd9bcf3 410
42a38cf7
MH
411out:
412 save_errno = errno;
7bd9bcf3
MH
413 strbuf_release(&sb_path);
414 strbuf_release(&sb_contents);
42a38cf7 415 errno = save_errno;
7bd9bcf3
MH
416 return ret;
417}
418
8415d247
MH
419static void unlock_ref(struct ref_lock *lock)
420{
421 /* Do not free lock->lk -- atexit() still looks at them */
422 if (lock->lk)
423 rollback_lock_file(lock->lk);
424 free(lock->ref_name);
8415d247
MH
425 free(lock);
426}
427
92b1551b
MH
428/*
429 * Lock refname, without following symrefs, and set *lock_p to point
430 * at a newly-allocated lock object. Fill in lock->old_oid, referent,
431 * and type similarly to read_raw_ref().
432 *
433 * The caller must verify that refname is a "safe" reference name (in
434 * the sense of refname_is_safe()) before calling this function.
435 *
436 * If the reference doesn't already exist, verify that refname doesn't
437 * have a D/F conflict with any existing references. extras and skip
524a9fdb 438 * are passed to refs_verify_refname_available() for this check.
92b1551b
MH
439 *
440 * If mustexist is not set and the reference is not found or is
441 * broken, lock the reference anyway but clear sha1.
442 *
443 * Return 0 on success. On failure, write an error message to err and
444 * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR.
445 *
446 * Implementation note: This function is basically
447 *
448 * lock reference
449 * read_raw_ref()
450 *
451 * but it includes a lot more code to
452 * - Deal with possible races with other processes
524a9fdb 453 * - Avoid calling refs_verify_refname_available() when it can be
92b1551b
MH
454 * avoided, namely if we were successfully able to read the ref
455 * - Generate informative error messages in the case of failure
456 */
f7b0a987
MH
457static int lock_raw_ref(struct files_ref_store *refs,
458 const char *refname, int mustexist,
92b1551b
MH
459 const struct string_list *extras,
460 const struct string_list *skip,
461 struct ref_lock **lock_p,
462 struct strbuf *referent,
463 unsigned int *type,
464 struct strbuf *err)
465{
466 struct ref_lock *lock;
467 struct strbuf ref_file = STRBUF_INIT;
468 int attempts_remaining = 3;
469 int ret = TRANSACTION_GENERIC_ERROR;
470
471 assert(err);
32c597e7 472 files_assert_main_repository(refs, "lock_raw_ref");
f7b0a987 473
92b1551b
MH
474 *type = 0;
475
476 /* First lock the file so it can't change out from under us. */
477
478 *lock_p = lock = xcalloc(1, sizeof(*lock));
479
480 lock->ref_name = xstrdup(refname);
19e02f4f 481 files_ref_path(refs, &ref_file, refname);
92b1551b
MH
482
483retry:
484 switch (safe_create_leading_directories(ref_file.buf)) {
485 case SCLD_OK:
486 break; /* success */
487 case SCLD_EXISTS:
488 /*
489 * Suppose refname is "refs/foo/bar". We just failed
490 * to create the containing directory, "refs/foo",
491 * because there was a non-directory in the way. This
492 * indicates a D/F conflict, probably because of
493 * another reference such as "refs/foo". There is no
494 * reason to expect this error to be transitory.
495 */
7d2df051
NTND
496 if (refs_verify_refname_available(&refs->base, refname,
497 extras, skip, err)) {
92b1551b
MH
498 if (mustexist) {
499 /*
500 * To the user the relevant error is
501 * that the "mustexist" reference is
502 * missing:
503 */
504 strbuf_reset(err);
505 strbuf_addf(err, "unable to resolve reference '%s'",
506 refname);
507 } else {
508 /*
509 * The error message set by
524a9fdb
MH
510 * refs_verify_refname_available() is
511 * OK.
92b1551b
MH
512 */
513 ret = TRANSACTION_NAME_CONFLICT;
514 }
515 } else {
516 /*
517 * The file that is in the way isn't a loose
518 * reference. Report it as a low-level
519 * failure.
520 */
521 strbuf_addf(err, "unable to create lock file %s.lock; "
522 "non-directory in the way",
523 ref_file.buf);
524 }
525 goto error_return;
526 case SCLD_VANISHED:
527 /* Maybe another process was tidying up. Try again. */
528 if (--attempts_remaining > 0)
529 goto retry;
530 /* fall through */
531 default:
532 strbuf_addf(err, "unable to create directory for %s",
533 ref_file.buf);
534 goto error_return;
535 }
536
537 if (!lock->lk)
538 lock->lk = xcalloc(1, sizeof(struct lock_file));
539
4ff0f01c
MH
540 if (hold_lock_file_for_update_timeout(
541 lock->lk, ref_file.buf, LOCK_NO_DEREF,
542 get_files_ref_lock_timeout_ms()) < 0) {
92b1551b
MH
543 if (errno == ENOENT && --attempts_remaining > 0) {
544 /*
545 * Maybe somebody just deleted one of the
546 * directories leading to ref_file. Try
547 * again:
548 */
549 goto retry;
550 } else {
551 unable_to_lock_message(ref_file.buf, errno, err);
552 goto error_return;
553 }
554 }
555
556 /*
557 * Now we hold the lock and can read the reference without
558 * fear that its value will change.
559 */
560
f7b0a987 561 if (files_read_raw_ref(&refs->base, refname,
e1e33b72 562 lock->old_oid.hash, referent, type)) {
92b1551b
MH
563 if (errno == ENOENT) {
564 if (mustexist) {
565 /* Garden variety missing reference. */
566 strbuf_addf(err, "unable to resolve reference '%s'",
567 refname);
568 goto error_return;
569 } else {
570 /*
571 * Reference is missing, but that's OK. We
572 * know that there is not a conflict with
573 * another loose reference because
574 * (supposing that we are trying to lock
575 * reference "refs/foo/bar"):
576 *
577 * - We were successfully able to create
578 * the lockfile refs/foo/bar.lock, so we
579 * know there cannot be a loose reference
580 * named "refs/foo".
581 *
582 * - We got ENOENT and not EISDIR, so we
583 * know that there cannot be a loose
584 * reference named "refs/foo/bar/baz".
585 */
586 }
587 } else if (errno == EISDIR) {
588 /*
589 * There is a directory in the way. It might have
590 * contained references that have been deleted. If
591 * we don't require that the reference already
592 * exists, try to remove the directory so that it
593 * doesn't cause trouble when we want to rename the
594 * lockfile into place later.
595 */
596 if (mustexist) {
597 /* Garden variety missing reference. */
598 strbuf_addf(err, "unable to resolve reference '%s'",
599 refname);
600 goto error_return;
601 } else if (remove_dir_recursively(&ref_file,
602 REMOVE_DIR_EMPTY_ONLY)) {
b05855b5
MH
603 if (refs_verify_refname_available(
604 &refs->base, refname,
605 extras, skip, err)) {
92b1551b
MH
606 /*
607 * The error message set by
608 * verify_refname_available() is OK.
609 */
610 ret = TRANSACTION_NAME_CONFLICT;
611 goto error_return;
612 } else {
613 /*
614 * We can't delete the directory,
615 * but we also don't know of any
616 * references that it should
617 * contain.
618 */
619 strbuf_addf(err, "there is a non-empty directory '%s' "
620 "blocking reference '%s'",
621 ref_file.buf, refname);
622 goto error_return;
623 }
624 }
625 } else if (errno == EINVAL && (*type & REF_ISBROKEN)) {
626 strbuf_addf(err, "unable to resolve reference '%s': "
627 "reference broken", refname);
628 goto error_return;
629 } else {
630 strbuf_addf(err, "unable to resolve reference '%s': %s",
631 refname, strerror(errno));
632 goto error_return;
633 }
634
635 /*
636 * If the ref did not exist and we are creating it,
8ec617c8
MH
637 * make sure there is no existing packed ref that
638 * conflicts with refname:
92b1551b 639 */
524a9fdb 640 if (refs_verify_refname_available(
8ec617c8 641 refs->packed_ref_store, refname,
524a9fdb 642 extras, skip, err))
92b1551b 643 goto error_return;
92b1551b
MH
644 }
645
646 ret = 0;
647 goto out;
648
649error_return:
650 unlock_ref(lock);
651 *lock_p = NULL;
652
653out:
654 strbuf_release(&ref_file);
655 return ret;
656}
657
bd427cf2
MH
658static int files_peel_ref(struct ref_store *ref_store,
659 const char *refname, unsigned char *sha1)
7bd9bcf3 660{
9e7ec634
NTND
661 struct files_ref_store *refs =
662 files_downcast(ref_store, REF_STORE_READ | REF_STORE_ODB,
663 "peel_ref");
7bd9bcf3
MH
664 int flag;
665 unsigned char base[20];
666
4c4de895
MH
667 if (current_ref_iter && current_ref_iter->refname == refname) {
668 struct object_id peeled;
669
670 if (ref_iterator_peel(current_ref_iter, &peeled))
7bd9bcf3 671 return -1;
4c4de895 672 hashcpy(sha1, peeled.hash);
7bd9bcf3
MH
673 return 0;
674 }
675
2f40e954
NTND
676 if (refs_read_ref_full(ref_store, refname,
677 RESOLVE_REF_READING, base, &flag))
7bd9bcf3
MH
678 return -1;
679
680 /*
681 * If the reference is packed, read its ref_entry from the
682 * cache in the hope that we already know its peeled value.
683 * We only try this optimization on packed references because
684 * (a) forcing the filling of the loose reference cache could
685 * be expensive and (b) loose references anyway usually do not
686 * have REF_KNOWS_PEELED.
687 */
6dc6ba70 688 if (flag & REF_ISPACKED &&
e0cc8ac8 689 !refs_peel_ref(refs->packed_ref_store, refname, sha1))
6dc6ba70 690 return 0;
7bd9bcf3
MH
691
692 return peel_object(base, sha1);
693}
694
3bc581b9
MH
695struct files_ref_iterator {
696 struct ref_iterator base;
697
3bc581b9
MH
698 struct ref_iterator *iter0;
699 unsigned int flags;
700};
7bd9bcf3 701
3bc581b9
MH
702static int files_ref_iterator_advance(struct ref_iterator *ref_iterator)
703{
704 struct files_ref_iterator *iter =
705 (struct files_ref_iterator *)ref_iterator;
706 int ok;
7bd9bcf3 707
3bc581b9 708 while ((ok = ref_iterator_advance(iter->iter0)) == ITER_OK) {
0c09ec07
DT
709 if (iter->flags & DO_FOR_EACH_PER_WORKTREE_ONLY &&
710 ref_type(iter->iter0->refname) != REF_TYPE_PER_WORKTREE)
711 continue;
712
3bc581b9
MH
713 if (!(iter->flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
714 !ref_resolves_to_object(iter->iter0->refname,
715 iter->iter0->oid,
716 iter->iter0->flags))
717 continue;
718
719 iter->base.refname = iter->iter0->refname;
720 iter->base.oid = iter->iter0->oid;
721 iter->base.flags = iter->iter0->flags;
722 return ITER_OK;
7bd9bcf3
MH
723 }
724
3bc581b9
MH
725 iter->iter0 = NULL;
726 if (ref_iterator_abort(ref_iterator) != ITER_DONE)
727 ok = ITER_ERROR;
728
729 return ok;
7bd9bcf3
MH
730}
731
3bc581b9
MH
732static int files_ref_iterator_peel(struct ref_iterator *ref_iterator,
733 struct object_id *peeled)
7bd9bcf3 734{
3bc581b9
MH
735 struct files_ref_iterator *iter =
736 (struct files_ref_iterator *)ref_iterator;
93770590 737
3bc581b9
MH
738 return ref_iterator_peel(iter->iter0, peeled);
739}
740
741static int files_ref_iterator_abort(struct ref_iterator *ref_iterator)
742{
743 struct files_ref_iterator *iter =
744 (struct files_ref_iterator *)ref_iterator;
745 int ok = ITER_DONE;
746
747 if (iter->iter0)
748 ok = ref_iterator_abort(iter->iter0);
749
3bc581b9
MH
750 base_ref_iterator_free(ref_iterator);
751 return ok;
752}
753
754static struct ref_iterator_vtable files_ref_iterator_vtable = {
755 files_ref_iterator_advance,
756 files_ref_iterator_peel,
757 files_ref_iterator_abort
758};
759
1a769003 760static struct ref_iterator *files_ref_iterator_begin(
37b6f6d5 761 struct ref_store *ref_store,
3bc581b9
MH
762 const char *prefix, unsigned int flags)
763{
9e7ec634 764 struct files_ref_store *refs;
3bc581b9
MH
765 struct ref_iterator *loose_iter, *packed_iter;
766 struct files_ref_iterator *iter;
767 struct ref_iterator *ref_iterator;
0a0865b8 768 unsigned int required_flags = REF_STORE_READ;
3bc581b9 769
0a0865b8
MH
770 if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN))
771 required_flags |= REF_STORE_ODB;
3bc581b9 772
0a0865b8 773 refs = files_downcast(ref_store, required_flags, "ref_iterator_begin");
9e7ec634 774
3bc581b9
MH
775 iter = xcalloc(1, sizeof(*iter));
776 ref_iterator = &iter->base;
777 base_ref_iterator_init(ref_iterator, &files_ref_iterator_vtable);
778
779 /*
780 * We must make sure that all loose refs are read before
781 * accessing the packed-refs file; this avoids a race
782 * condition if loose refs are migrated to the packed-refs
783 * file by a simultaneous process, but our in-memory view is
784 * from before the migration. We ensure this as follows:
059ae35a
MH
785 * First, we call start the loose refs iteration with its
786 * `prime_ref` argument set to true. This causes the loose
787 * references in the subtree to be pre-read into the cache.
788 * (If they've already been read, that's OK; we only need to
789 * guarantee that they're read before the packed refs, not
790 * *how much* before.) After that, we call
38b86e81
MH
791 * packed_ref_iterator_begin(), which internally checks
792 * whether the packed-ref cache is up to date with what is on
793 * disk, and re-reads it if not.
3bc581b9
MH
794 */
795
059ae35a
MH
796 loose_iter = cache_ref_iterator_begin(get_loose_ref_cache(refs),
797 prefix, 1);
3bc581b9 798
38b86e81
MH
799 /*
800 * The packed-refs file might contain broken references, for
801 * example an old version of a reference that points at an
802 * object that has since been garbage-collected. This is OK as
803 * long as there is a corresponding loose reference that
804 * overrides it, and we don't want to emit an error message in
805 * this case. So ask the packed_ref_store for all of its
806 * references, and (if needed) do our own check for broken
807 * ones in files_ref_iterator_advance(), after we have merged
808 * the packed and loose references.
809 */
e0cc8ac8
MH
810 packed_iter = refs_ref_iterator_begin(
811 refs->packed_ref_store, prefix, 0,
38b86e81 812 DO_FOR_EACH_INCLUDE_BROKEN);
3bc581b9
MH
813
814 iter->iter0 = overlay_ref_iterator_begin(loose_iter, packed_iter);
815 iter->flags = flags;
816
817 return ref_iterator;
7bd9bcf3
MH
818}
819
7bd9bcf3
MH
820/*
821 * Verify that the reference locked by lock has the value old_sha1.
822 * Fail if the reference doesn't exist and mustexist is set. Return 0
823 * on success. On error, write an error message to err, set errno, and
824 * return a negative value.
825 */
2f40e954 826static int verify_lock(struct ref_store *ref_store, struct ref_lock *lock,
7bd9bcf3
MH
827 const unsigned char *old_sha1, int mustexist,
828 struct strbuf *err)
829{
830 assert(err);
831
2f40e954
NTND
832 if (refs_read_ref_full(ref_store, lock->ref_name,
833 mustexist ? RESOLVE_REF_READING : 0,
834 lock->old_oid.hash, NULL)) {
6294dcb4
JK
835 if (old_sha1) {
836 int save_errno = errno;
0568c8e9 837 strbuf_addf(err, "can't verify ref '%s'", lock->ref_name);
6294dcb4
JK
838 errno = save_errno;
839 return -1;
840 } else {
c368dde9 841 oidclr(&lock->old_oid);
6294dcb4
JK
842 return 0;
843 }
7bd9bcf3 844 }
6294dcb4 845 if (old_sha1 && hashcmp(lock->old_oid.hash, old_sha1)) {
0568c8e9 846 strbuf_addf(err, "ref '%s' is at %s but expected %s",
7bd9bcf3 847 lock->ref_name,
c368dde9 848 oid_to_hex(&lock->old_oid),
7bd9bcf3
MH
849 sha1_to_hex(old_sha1));
850 errno = EBUSY;
851 return -1;
852 }
853 return 0;
854}
855
856static int remove_empty_directories(struct strbuf *path)
857{
858 /*
859 * we want to create a file but there is a directory there;
860 * if that is an empty directory (or a directory that contains
861 * only empty directories), remove them.
862 */
863 return remove_dir_recursively(path, REMOVE_DIR_EMPTY_ONLY);
864}
865
3b5d3c98
MH
866static int create_reflock(const char *path, void *cb)
867{
868 struct lock_file *lk = cb;
869
4ff0f01c
MH
870 return hold_lock_file_for_update_timeout(
871 lk, path, LOCK_NO_DEREF,
872 get_files_ref_lock_timeout_ms()) < 0 ? -1 : 0;
3b5d3c98
MH
873}
874
7bd9bcf3
MH
875/*
876 * Locks a ref returning the lock on success and NULL on failure.
877 * On failure errno is set to something meaningful.
878 */
7eb27cdf
MH
879static struct ref_lock *lock_ref_sha1_basic(struct files_ref_store *refs,
880 const char *refname,
7bd9bcf3
MH
881 const unsigned char *old_sha1,
882 const struct string_list *extras,
883 const struct string_list *skip,
bcb497d0 884 unsigned int flags, int *type,
7bd9bcf3
MH
885 struct strbuf *err)
886{
887 struct strbuf ref_file = STRBUF_INIT;
7bd9bcf3
MH
888 struct ref_lock *lock;
889 int last_errno = 0;
7bd9bcf3 890 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
7a418f3a 891 int resolve_flags = RESOLVE_REF_NO_RECURSE;
7a418f3a 892 int resolved;
7bd9bcf3 893
32c597e7 894 files_assert_main_repository(refs, "lock_ref_sha1_basic");
7bd9bcf3
MH
895 assert(err);
896
897 lock = xcalloc(1, sizeof(struct ref_lock));
898
899 if (mustexist)
900 resolve_flags |= RESOLVE_REF_READING;
2859dcd4 901 if (flags & REF_DELETING)
7bd9bcf3 902 resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME;
7bd9bcf3 903
19e02f4f 904 files_ref_path(refs, &ref_file, refname);
2f40e954
NTND
905 resolved = !!refs_resolve_ref_unsafe(&refs->base,
906 refname, resolve_flags,
907 lock->old_oid.hash, type);
7a418f3a 908 if (!resolved && errno == EISDIR) {
7bd9bcf3
MH
909 /*
910 * we are trying to lock foo but we used to
911 * have foo/bar which now does not exist;
912 * it is normal for the empty directory 'foo'
913 * to remain.
914 */
7a418f3a 915 if (remove_empty_directories(&ref_file)) {
7bd9bcf3 916 last_errno = errno;
b05855b5
MH
917 if (!refs_verify_refname_available(
918 &refs->base,
919 refname, extras, skip, err))
7bd9bcf3 920 strbuf_addf(err, "there are still refs under '%s'",
7a418f3a 921 refname);
7bd9bcf3
MH
922 goto error_return;
923 }
2f40e954
NTND
924 resolved = !!refs_resolve_ref_unsafe(&refs->base,
925 refname, resolve_flags,
926 lock->old_oid.hash, type);
7bd9bcf3 927 }
7a418f3a 928 if (!resolved) {
7bd9bcf3
MH
929 last_errno = errno;
930 if (last_errno != ENOTDIR ||
b05855b5
MH
931 !refs_verify_refname_available(&refs->base, refname,
932 extras, skip, err))
0568c8e9 933 strbuf_addf(err, "unable to resolve reference '%s': %s",
7a418f3a 934 refname, strerror(last_errno));
7bd9bcf3
MH
935
936 goto error_return;
937 }
2859dcd4 938
7bd9bcf3
MH
939 /*
940 * If the ref did not exist and we are creating it, make sure
941 * there is no existing packed ref whose name begins with our
942 * refname, nor a packed ref whose name is a proper prefix of
943 * our refname.
944 */
945 if (is_null_oid(&lock->old_oid) &&
8ec617c8 946 refs_verify_refname_available(refs->packed_ref_store, refname,
524a9fdb 947 extras, skip, err)) {
7bd9bcf3
MH
948 last_errno = ENOTDIR;
949 goto error_return;
950 }
951
952 lock->lk = xcalloc(1, sizeof(struct lock_file));
953
7bd9bcf3 954 lock->ref_name = xstrdup(refname);
7bd9bcf3 955
3b5d3c98 956 if (raceproof_create_file(ref_file.buf, create_reflock, lock->lk)) {
7bd9bcf3 957 last_errno = errno;
3b5d3c98 958 unable_to_lock_message(ref_file.buf, errno, err);
7bd9bcf3
MH
959 goto error_return;
960 }
961
2f40e954 962 if (verify_lock(&refs->base, lock, old_sha1, mustexist, err)) {
7bd9bcf3
MH
963 last_errno = errno;
964 goto error_return;
965 }
966 goto out;
967
968 error_return:
969 unlock_ref(lock);
970 lock = NULL;
971
972 out:
973 strbuf_release(&ref_file);
7bd9bcf3
MH
974 errno = last_errno;
975 return lock;
976}
977
7bd9bcf3
MH
978struct ref_to_prune {
979 struct ref_to_prune *next;
980 unsigned char sha1[20];
981 char name[FLEX_ARRAY];
982};
983
a8f0db2d
MH
984enum {
985 REMOVE_EMPTY_PARENTS_REF = 0x01,
986 REMOVE_EMPTY_PARENTS_REFLOG = 0x02
987};
988
7bd9bcf3 989/*
a8f0db2d
MH
990 * Remove empty parent directories associated with the specified
991 * reference and/or its reflog, but spare [logs/]refs/ and immediate
992 * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or
993 * REMOVE_EMPTY_PARENTS_REFLOG.
7bd9bcf3 994 */
802de3da
NTND
995static void try_remove_empty_parents(struct files_ref_store *refs,
996 const char *refname,
997 unsigned int flags)
7bd9bcf3 998{
8bdaecb4 999 struct strbuf buf = STRBUF_INIT;
e9dcc305 1000 struct strbuf sb = STRBUF_INIT;
7bd9bcf3
MH
1001 char *p, *q;
1002 int i;
8bdaecb4
MH
1003
1004 strbuf_addstr(&buf, refname);
1005 p = buf.buf;
7bd9bcf3
MH
1006 for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */
1007 while (*p && *p != '/')
1008 p++;
1009 /* tolerate duplicate slashes; see check_refname_format() */
1010 while (*p == '/')
1011 p++;
1012 }
8bdaecb4 1013 q = buf.buf + buf.len;
a8f0db2d 1014 while (flags & (REMOVE_EMPTY_PARENTS_REF | REMOVE_EMPTY_PARENTS_REFLOG)) {
7bd9bcf3
MH
1015 while (q > p && *q != '/')
1016 q--;
1017 while (q > p && *(q-1) == '/')
1018 q--;
1019 if (q == p)
1020 break;
8bdaecb4 1021 strbuf_setlen(&buf, q - buf.buf);
e9dcc305
NTND
1022
1023 strbuf_reset(&sb);
19e02f4f 1024 files_ref_path(refs, &sb, buf.buf);
e9dcc305 1025 if ((flags & REMOVE_EMPTY_PARENTS_REF) && rmdir(sb.buf))
a8f0db2d 1026 flags &= ~REMOVE_EMPTY_PARENTS_REF;
e9dcc305
NTND
1027
1028 strbuf_reset(&sb);
802de3da 1029 files_reflog_path(refs, &sb, buf.buf);
e9dcc305 1030 if ((flags & REMOVE_EMPTY_PARENTS_REFLOG) && rmdir(sb.buf))
a8f0db2d 1031 flags &= ~REMOVE_EMPTY_PARENTS_REFLOG;
7bd9bcf3 1032 }
8bdaecb4 1033 strbuf_release(&buf);
e9dcc305 1034 strbuf_release(&sb);
7bd9bcf3
MH
1035}
1036
1037/* make sure nobody touched the ref, and unlink */
2f40e954 1038static void prune_ref(struct files_ref_store *refs, struct ref_to_prune *r)
7bd9bcf3
MH
1039{
1040 struct ref_transaction *transaction;
1041 struct strbuf err = STRBUF_INIT;
1042
1043 if (check_refname_format(r->name, 0))
1044 return;
1045
2f40e954 1046 transaction = ref_store_transaction_begin(&refs->base, &err);
7bd9bcf3
MH
1047 if (!transaction ||
1048 ref_transaction_delete(transaction, r->name, r->sha1,
c52ce248 1049 REF_ISPRUNING | REF_NODEREF, NULL, &err) ||
7bd9bcf3
MH
1050 ref_transaction_commit(transaction, &err)) {
1051 ref_transaction_free(transaction);
1052 error("%s", err.buf);
1053 strbuf_release(&err);
1054 return;
1055 }
1056 ref_transaction_free(transaction);
1057 strbuf_release(&err);
7bd9bcf3
MH
1058}
1059
22b09cdf
MH
1060/*
1061 * Prune the loose versions of the references in the linked list
1062 * `*refs_to_prune`, freeing the entries in the list as we go.
1063 */
1064static void prune_refs(struct files_ref_store *refs, struct ref_to_prune **refs_to_prune)
7bd9bcf3 1065{
22b09cdf
MH
1066 while (*refs_to_prune) {
1067 struct ref_to_prune *r = *refs_to_prune;
1068 *refs_to_prune = r->next;
2f40e954 1069 prune_ref(refs, r);
22b09cdf 1070 free(r);
7bd9bcf3
MH
1071 }
1072}
1073
531cc4a5
MH
1074/*
1075 * Return true if the specified reference should be packed.
1076 */
1077static int should_pack_ref(const char *refname,
1078 const struct object_id *oid, unsigned int ref_flags,
1079 unsigned int pack_flags)
1080{
1081 /* Do not pack per-worktree refs: */
1082 if (ref_type(refname) != REF_TYPE_NORMAL)
1083 return 0;
1084
1085 /* Do not pack non-tags unless PACK_REFS_ALL is set: */
1086 if (!(pack_flags & PACK_REFS_ALL) && !starts_with(refname, "refs/tags/"))
1087 return 0;
1088
1089 /* Do not pack symbolic refs: */
1090 if (ref_flags & REF_ISSYMREF)
1091 return 0;
1092
1093 /* Do not pack broken refs: */
1094 if (!ref_resolves_to_object(refname, oid, ref_flags))
1095 return 0;
1096
1097 return 1;
1098}
1099
8231527e 1100static int files_pack_refs(struct ref_store *ref_store, unsigned int flags)
7bd9bcf3 1101{
00eebe35 1102 struct files_ref_store *refs =
9e7ec634
NTND
1103 files_downcast(ref_store, REF_STORE_WRITE | REF_STORE_ODB,
1104 "pack_refs");
50c2d855 1105 struct ref_iterator *iter;
50c2d855
MH
1106 int ok;
1107 struct ref_to_prune *refs_to_prune = NULL;
3478983b 1108 struct strbuf err = STRBUF_INIT;
27d03d04
MH
1109 struct ref_transaction *transaction;
1110
1111 transaction = ref_store_transaction_begin(refs->packed_ref_store, &err);
1112 if (!transaction)
1113 return -1;
7bd9bcf3 1114
c8bed835 1115 packed_refs_lock(refs->packed_ref_store, LOCK_DIE_ON_ERROR, &err);
50c2d855
MH
1116
1117 iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), NULL, 0);
1118 while ((ok = ref_iterator_advance(iter)) == ITER_OK) {
1119 /*
1120 * If the loose reference can be packed, add an entry
1121 * in the packed ref cache. If the reference should be
1122 * pruned, also add it to refs_to_prune.
1123 */
531cc4a5
MH
1124 if (!should_pack_ref(iter->refname, iter->oid, iter->flags,
1125 flags))
50c2d855
MH
1126 continue;
1127
1128 /*
27d03d04
MH
1129 * Add a reference creation for this reference to the
1130 * packed-refs transaction:
50c2d855 1131 */
27d03d04
MH
1132 if (ref_transaction_update(transaction, iter->refname,
1133 iter->oid->hash, NULL,
1134 REF_NODEREF, NULL, &err))
1135 die("failure preparing to create packed reference %s: %s",
1136 iter->refname, err.buf);
50c2d855
MH
1137
1138 /* Schedule the loose reference for pruning if requested. */
1139 if ((flags & PACK_REFS_PRUNE)) {
1140 struct ref_to_prune *n;
1141 FLEX_ALLOC_STR(n, name, iter->refname);
1142 hashcpy(n->sha1, iter->oid->hash);
1143 n->next = refs_to_prune;
1144 refs_to_prune = n;
1145 }
1146 }
1147 if (ok != ITER_DONE)
1148 die("error while iterating over references");
7bd9bcf3 1149
27d03d04
MH
1150 if (ref_transaction_commit(transaction, &err))
1151 die("unable to write new packed-refs: %s", err.buf);
1152
1153 ref_transaction_free(transaction);
1154
42c7f7ff 1155 packed_refs_unlock(refs->packed_ref_store);
7bd9bcf3 1156
22b09cdf 1157 prune_refs(refs, &refs_to_prune);
3478983b 1158 strbuf_release(&err);
7bd9bcf3
MH
1159 return 0;
1160}
1161
64da4199 1162static int files_delete_refs(struct ref_store *ref_store, const char *msg,
a27dcf89 1163 struct string_list *refnames, unsigned int flags)
7bd9bcf3 1164{
0a95ac5f 1165 struct files_ref_store *refs =
9e7ec634 1166 files_downcast(ref_store, REF_STORE_WRITE, "delete_refs");
7bd9bcf3
MH
1167 struct strbuf err = STRBUF_INIT;
1168 int i, result = 0;
1169
1170 if (!refnames->nr)
1171 return 0;
1172
e5cc7d7d
MH
1173 if (packed_refs_lock(refs->packed_ref_store, 0, &err))
1174 goto error;
7bd9bcf3 1175
2fb330ca 1176 if (refs_delete_refs(refs->packed_ref_store, msg, refnames, flags)) {
e5cc7d7d
MH
1177 packed_refs_unlock(refs->packed_ref_store);
1178 goto error;
7bd9bcf3
MH
1179 }
1180
e5cc7d7d
MH
1181 packed_refs_unlock(refs->packed_ref_store);
1182
7bd9bcf3
MH
1183 for (i = 0; i < refnames->nr; i++) {
1184 const char *refname = refnames->items[i].string;
1185
64da4199 1186 if (refs_delete_ref(&refs->base, msg, refname, NULL, flags))
7bd9bcf3
MH
1187 result |= error(_("could not remove reference %s"), refname);
1188 }
1189
7bd9bcf3
MH
1190 strbuf_release(&err);
1191 return result;
e5cc7d7d
MH
1192
1193error:
1194 /*
1195 * If we failed to rewrite the packed-refs file, then it is
1196 * unsafe to try to remove loose refs, because doing so might
1197 * expose an obsolete packed value for a reference that might
1198 * even point at an object that has been garbage collected.
1199 */
1200 if (refnames->nr == 1)
1201 error(_("could not delete reference %s: %s"),
1202 refnames->items[0].string, err.buf);
1203 else
1204 error(_("could not delete references: %s"), err.buf);
1205
1206 strbuf_release(&err);
1207 return -1;
7bd9bcf3
MH
1208}
1209
1210/*
1211 * People using contrib's git-new-workdir have .git/logs/refs ->
1212 * /some/other/path/.git/logs/refs, and that may live on another device.
1213 *
1214 * IOW, to avoid cross device rename errors, the temporary renamed log must
1215 * live into logs/refs.
1216 */
a5c1efd6 1217#define TMP_RENAMED_LOG "refs/.tmp-renamed-log"
7bd9bcf3 1218
e9dcc305
NTND
1219struct rename_cb {
1220 const char *tmp_renamed_log;
1221 int true_errno;
1222};
1223
1224static int rename_tmp_log_callback(const char *path, void *cb_data)
7bd9bcf3 1225{
e9dcc305 1226 struct rename_cb *cb = cb_data;
7bd9bcf3 1227
e9dcc305 1228 if (rename(cb->tmp_renamed_log, path)) {
6a7f3631
MH
1229 /*
1230 * rename(a, b) when b is an existing directory ought
1231 * to result in ISDIR, but Solaris 5.8 gives ENOTDIR.
1232 * Sheesh. Record the true errno for error reporting,
1233 * but report EISDIR to raceproof_create_file() so
1234 * that it knows to retry.
1235 */
e9dcc305 1236 cb->true_errno = errno;
6a7f3631
MH
1237 if (errno == ENOTDIR)
1238 errno = EISDIR;
1239 return -1;
1240 } else {
1241 return 0;
7bd9bcf3 1242 }
6a7f3631 1243}
7bd9bcf3 1244
802de3da 1245static int rename_tmp_log(struct files_ref_store *refs, const char *newrefname)
6a7f3631 1246{
e9dcc305
NTND
1247 struct strbuf path = STRBUF_INIT;
1248 struct strbuf tmp = STRBUF_INIT;
1249 struct rename_cb cb;
1250 int ret;
6a7f3631 1251
802de3da
NTND
1252 files_reflog_path(refs, &path, newrefname);
1253 files_reflog_path(refs, &tmp, TMP_RENAMED_LOG);
e9dcc305
NTND
1254 cb.tmp_renamed_log = tmp.buf;
1255 ret = raceproof_create_file(path.buf, rename_tmp_log_callback, &cb);
6a7f3631
MH
1256 if (ret) {
1257 if (errno == EISDIR)
e9dcc305 1258 error("directory not empty: %s", path.buf);
6a7f3631 1259 else
990c98d2 1260 error("unable to move logfile %s to %s: %s",
e9dcc305
NTND
1261 tmp.buf, path.buf,
1262 strerror(cb.true_errno));
7bd9bcf3 1263 }
6a7f3631 1264
e9dcc305
NTND
1265 strbuf_release(&path);
1266 strbuf_release(&tmp);
7bd9bcf3
MH
1267 return ret;
1268}
1269
7bd9bcf3 1270static int write_ref_to_lockfile(struct ref_lock *lock,
4417df8c 1271 const struct object_id *oid, struct strbuf *err);
f18a7892
MH
1272static int commit_ref_update(struct files_ref_store *refs,
1273 struct ref_lock *lock,
4417df8c 1274 const struct object_id *oid, const char *logmsg,
5d9b2de4 1275 struct strbuf *err);
7bd9bcf3 1276
9b6b40d9
DT
1277static int files_rename_ref(struct ref_store *ref_store,
1278 const char *oldrefname, const char *newrefname,
1279 const char *logmsg)
7bd9bcf3 1280{
9b6b40d9 1281 struct files_ref_store *refs =
9e7ec634 1282 files_downcast(ref_store, REF_STORE_WRITE, "rename_ref");
4417df8c 1283 struct object_id oid, orig_oid;
7bd9bcf3
MH
1284 int flag = 0, logmoved = 0;
1285 struct ref_lock *lock;
1286 struct stat loginfo;
e9dcc305
NTND
1287 struct strbuf sb_oldref = STRBUF_INIT;
1288 struct strbuf sb_newref = STRBUF_INIT;
1289 struct strbuf tmp_renamed_log = STRBUF_INIT;
1290 int log, ret;
7bd9bcf3
MH
1291 struct strbuf err = STRBUF_INIT;
1292
802de3da
NTND
1293 files_reflog_path(refs, &sb_oldref, oldrefname);
1294 files_reflog_path(refs, &sb_newref, newrefname);
1295 files_reflog_path(refs, &tmp_renamed_log, TMP_RENAMED_LOG);
e9dcc305
NTND
1296
1297 log = !lstat(sb_oldref.buf, &loginfo);
0a3f07d6
NTND
1298 if (log && S_ISLNK(loginfo.st_mode)) {
1299 ret = error("reflog for %s is a symlink", oldrefname);
1300 goto out;
1301 }
7bd9bcf3 1302
2f40e954
NTND
1303 if (!refs_resolve_ref_unsafe(&refs->base, oldrefname,
1304 RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE,
4417df8c 1305 orig_oid.hash, &flag)) {
0a3f07d6
NTND
1306 ret = error("refname %s not found", oldrefname);
1307 goto out;
1308 }
e711b1af 1309
0a3f07d6
NTND
1310 if (flag & REF_ISSYMREF) {
1311 ret = error("refname %s is a symbolic ref, renaming it is not supported",
1312 oldrefname);
1313 goto out;
1314 }
7d2df051 1315 if (!refs_rename_ref_available(&refs->base, oldrefname, newrefname)) {
0a3f07d6
NTND
1316 ret = 1;
1317 goto out;
1318 }
7bd9bcf3 1319
e9dcc305 1320 if (log && rename(sb_oldref.buf, tmp_renamed_log.buf)) {
a5c1efd6 1321 ret = error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG": %s",
0a3f07d6
NTND
1322 oldrefname, strerror(errno));
1323 goto out;
1324 }
7bd9bcf3 1325
2f40e954 1326 if (refs_delete_ref(&refs->base, logmsg, oldrefname,
4417df8c 1327 orig_oid.hash, REF_NODEREF)) {
7bd9bcf3
MH
1328 error("unable to delete old %s", oldrefname);
1329 goto rollback;
1330 }
1331
12fd3496 1332 /*
4417df8c 1333 * Since we are doing a shallow lookup, oid is not the
1334 * correct value to pass to delete_ref as old_oid. But that
1335 * doesn't matter, because an old_oid check wouldn't add to
12fd3496
DT
1336 * the safety anyway; we want to delete the reference whatever
1337 * its current value.
1338 */
2f40e954
NTND
1339 if (!refs_read_ref_full(&refs->base, newrefname,
1340 RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE,
4417df8c 1341 oid.hash, NULL) &&
2f40e954
NTND
1342 refs_delete_ref(&refs->base, NULL, newrefname,
1343 NULL, REF_NODEREF)) {
58364324 1344 if (errno == EISDIR) {
7bd9bcf3
MH
1345 struct strbuf path = STRBUF_INIT;
1346 int result;
1347
19e02f4f 1348 files_ref_path(refs, &path, newrefname);
7bd9bcf3
MH
1349 result = remove_empty_directories(&path);
1350 strbuf_release(&path);
1351
1352 if (result) {
1353 error("Directory not empty: %s", newrefname);
1354 goto rollback;
1355 }
1356 } else {
1357 error("unable to delete existing %s", newrefname);
1358 goto rollback;
1359 }
1360 }
1361
802de3da 1362 if (log && rename_tmp_log(refs, newrefname))
7bd9bcf3
MH
1363 goto rollback;
1364
1365 logmoved = log;
1366
7eb27cdf
MH
1367 lock = lock_ref_sha1_basic(refs, newrefname, NULL, NULL, NULL,
1368 REF_NODEREF, NULL, &err);
7bd9bcf3
MH
1369 if (!lock) {
1370 error("unable to rename '%s' to '%s': %s", oldrefname, newrefname, err.buf);
1371 strbuf_release(&err);
1372 goto rollback;
1373 }
4417df8c 1374 oidcpy(&lock->old_oid, &orig_oid);
7bd9bcf3 1375
4417df8c 1376 if (write_ref_to_lockfile(lock, &orig_oid, &err) ||
1377 commit_ref_update(refs, lock, &orig_oid, logmsg, &err)) {
7bd9bcf3
MH
1378 error("unable to write current sha1 into %s: %s", newrefname, err.buf);
1379 strbuf_release(&err);
1380 goto rollback;
1381 }
1382
0a3f07d6
NTND
1383 ret = 0;
1384 goto out;
7bd9bcf3
MH
1385
1386 rollback:
7eb27cdf
MH
1387 lock = lock_ref_sha1_basic(refs, oldrefname, NULL, NULL, NULL,
1388 REF_NODEREF, NULL, &err);
7bd9bcf3
MH
1389 if (!lock) {
1390 error("unable to lock %s for rollback: %s", oldrefname, err.buf);
1391 strbuf_release(&err);
1392 goto rollbacklog;
1393 }
1394
1395 flag = log_all_ref_updates;
341fb286 1396 log_all_ref_updates = LOG_REFS_NONE;
4417df8c 1397 if (write_ref_to_lockfile(lock, &orig_oid, &err) ||
1398 commit_ref_update(refs, lock, &orig_oid, NULL, &err)) {
7bd9bcf3
MH
1399 error("unable to write current sha1 into %s: %s", oldrefname, err.buf);
1400 strbuf_release(&err);
1401 }
1402 log_all_ref_updates = flag;
1403
1404 rollbacklog:
e9dcc305 1405 if (logmoved && rename(sb_newref.buf, sb_oldref.buf))
7bd9bcf3
MH
1406 error("unable to restore logfile %s from %s: %s",
1407 oldrefname, newrefname, strerror(errno));
1408 if (!logmoved && log &&
e9dcc305 1409 rename(tmp_renamed_log.buf, sb_oldref.buf))
a5c1efd6 1410 error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG": %s",
7bd9bcf3 1411 oldrefname, strerror(errno));
0a3f07d6
NTND
1412 ret = 1;
1413 out:
e9dcc305
NTND
1414 strbuf_release(&sb_newref);
1415 strbuf_release(&sb_oldref);
1416 strbuf_release(&tmp_renamed_log);
1417
0a3f07d6 1418 return ret;
7bd9bcf3
MH
1419}
1420
1421static int close_ref(struct ref_lock *lock)
1422{
1423 if (close_lock_file(lock->lk))
1424 return -1;
1425 return 0;
1426}
1427
1428static int commit_ref(struct ref_lock *lock)
1429{
5387c0d8
MH
1430 char *path = get_locked_file_path(lock->lk);
1431 struct stat st;
1432
1433 if (!lstat(path, &st) && S_ISDIR(st.st_mode)) {
1434 /*
1435 * There is a directory at the path we want to rename
1436 * the lockfile to. Hopefully it is empty; try to
1437 * delete it.
1438 */
1439 size_t len = strlen(path);
1440 struct strbuf sb_path = STRBUF_INIT;
1441
1442 strbuf_attach(&sb_path, path, len, len);
1443
1444 /*
1445 * If this fails, commit_lock_file() will also fail
1446 * and will report the problem.
1447 */
1448 remove_empty_directories(&sb_path);
1449 strbuf_release(&sb_path);
1450 } else {
1451 free(path);
1452 }
1453
7bd9bcf3
MH
1454 if (commit_lock_file(lock->lk))
1455 return -1;
1456 return 0;
1457}
1458
1fb0c809
MH
1459static int open_or_create_logfile(const char *path, void *cb)
1460{
1461 int *fd = cb;
1462
1463 *fd = open(path, O_APPEND | O_WRONLY | O_CREAT, 0666);
1464 return (*fd < 0) ? -1 : 0;
1465}
1466
7bd9bcf3 1467/*
4533e534
MH
1468 * Create a reflog for a ref. If force_create = 0, only create the
1469 * reflog for certain refs (those for which should_autocreate_reflog
1470 * returns non-zero). Otherwise, create it regardless of the reference
1471 * name. If the logfile already existed or was created, return 0 and
1472 * set *logfd to the file descriptor opened for appending to the file.
1473 * If no logfile exists and we decided not to create one, return 0 and
1474 * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and
1475 * return -1.
7bd9bcf3 1476 */
802de3da
NTND
1477static int log_ref_setup(struct files_ref_store *refs,
1478 const char *refname, int force_create,
4533e534 1479 int *logfd, struct strbuf *err)
7bd9bcf3 1480{
802de3da
NTND
1481 struct strbuf logfile_sb = STRBUF_INIT;
1482 char *logfile;
1483
1484 files_reflog_path(refs, &logfile_sb, refname);
1485 logfile = strbuf_detach(&logfile_sb, NULL);
7bd9bcf3 1486
7bd9bcf3 1487 if (force_create || should_autocreate_reflog(refname)) {
4533e534 1488 if (raceproof_create_file(logfile, open_or_create_logfile, logfd)) {
1fb0c809
MH
1489 if (errno == ENOENT)
1490 strbuf_addf(err, "unable to create directory for '%s': "
4533e534 1491 "%s", logfile, strerror(errno));
1fb0c809
MH
1492 else if (errno == EISDIR)
1493 strbuf_addf(err, "there are still logs under '%s'",
4533e534 1494 logfile);
1fb0c809 1495 else
854bda6b 1496 strbuf_addf(err, "unable to append to '%s': %s",
4533e534 1497 logfile, strerror(errno));
7bd9bcf3 1498
4533e534 1499 goto error;
7bd9bcf3 1500 }
854bda6b 1501 } else {
4533e534 1502 *logfd = open(logfile, O_APPEND | O_WRONLY, 0666);
e404f459 1503 if (*logfd < 0) {
854bda6b
MH
1504 if (errno == ENOENT || errno == EISDIR) {
1505 /*
1506 * The logfile doesn't already exist,
1507 * but that is not an error; it only
1508 * means that we won't write log
1509 * entries to it.
1510 */
1511 ;
1512 } else {
1513 strbuf_addf(err, "unable to append to '%s': %s",
4533e534
MH
1514 logfile, strerror(errno));
1515 goto error;
854bda6b 1516 }
7bd9bcf3
MH
1517 }
1518 }
1519
e404f459 1520 if (*logfd >= 0)
4533e534 1521 adjust_shared_perm(logfile);
854bda6b 1522
4533e534 1523 free(logfile);
7bd9bcf3 1524 return 0;
7bd9bcf3 1525
4533e534
MH
1526error:
1527 free(logfile);
1528 return -1;
7bd9bcf3 1529}
7bd9bcf3 1530
e3688bd6
DT
1531static int files_create_reflog(struct ref_store *ref_store,
1532 const char *refname, int force_create,
1533 struct strbuf *err)
7bd9bcf3 1534{
802de3da 1535 struct files_ref_store *refs =
9e7ec634 1536 files_downcast(ref_store, REF_STORE_WRITE, "create_reflog");
e404f459 1537 int fd;
7bd9bcf3 1538
802de3da 1539 if (log_ref_setup(refs, refname, force_create, &fd, err))
4533e534
MH
1540 return -1;
1541
e404f459
MH
1542 if (fd >= 0)
1543 close(fd);
4533e534
MH
1544
1545 return 0;
7bd9bcf3
MH
1546}
1547
4417df8c 1548static int log_ref_write_fd(int fd, const struct object_id *old_oid,
1549 const struct object_id *new_oid,
7bd9bcf3
MH
1550 const char *committer, const char *msg)
1551{
1552 int msglen, written;
1553 unsigned maxlen, len;
1554 char *logrec;
1555
1556 msglen = msg ? strlen(msg) : 0;
1557 maxlen = strlen(committer) + msglen + 100;
1558 logrec = xmalloc(maxlen);
1559 len = xsnprintf(logrec, maxlen, "%s %s %s\n",
4417df8c 1560 oid_to_hex(old_oid),
1561 oid_to_hex(new_oid),
7bd9bcf3
MH
1562 committer);
1563 if (msglen)
1564 len += copy_reflog_msg(logrec + len - 1, msg) - 1;
1565
1566 written = len <= maxlen ? write_in_full(fd, logrec, len) : -1;
1567 free(logrec);
1568 if (written != len)
1569 return -1;
1570
1571 return 0;
1572}
1573
802de3da 1574static int files_log_ref_write(struct files_ref_store *refs,
4417df8c 1575 const char *refname, const struct object_id *old_oid,
1576 const struct object_id *new_oid, const char *msg,
11f8457f 1577 int flags, struct strbuf *err)
7bd9bcf3 1578{
e404f459 1579 int logfd, result;
7bd9bcf3 1580
341fb286
CW
1581 if (log_all_ref_updates == LOG_REFS_UNSET)
1582 log_all_ref_updates = is_bare_repository() ? LOG_REFS_NONE : LOG_REFS_NORMAL;
7bd9bcf3 1583
802de3da
NTND
1584 result = log_ref_setup(refs, refname,
1585 flags & REF_FORCE_CREATE_REFLOG,
4533e534 1586 &logfd, err);
7bd9bcf3
MH
1587
1588 if (result)
1589 return result;
1590
7bd9bcf3
MH
1591 if (logfd < 0)
1592 return 0;
4417df8c 1593 result = log_ref_write_fd(logfd, old_oid, new_oid,
7bd9bcf3
MH
1594 git_committer_info(0), msg);
1595 if (result) {
e9dcc305 1596 struct strbuf sb = STRBUF_INIT;
87b21e05
MH
1597 int save_errno = errno;
1598
802de3da 1599 files_reflog_path(refs, &sb, refname);
87b21e05 1600 strbuf_addf(err, "unable to append to '%s': %s",
e9dcc305
NTND
1601 sb.buf, strerror(save_errno));
1602 strbuf_release(&sb);
7bd9bcf3
MH
1603 close(logfd);
1604 return -1;
1605 }
1606 if (close(logfd)) {
e9dcc305 1607 struct strbuf sb = STRBUF_INIT;
87b21e05
MH
1608 int save_errno = errno;
1609
802de3da 1610 files_reflog_path(refs, &sb, refname);
87b21e05 1611 strbuf_addf(err, "unable to append to '%s': %s",
e9dcc305
NTND
1612 sb.buf, strerror(save_errno));
1613 strbuf_release(&sb);
7bd9bcf3
MH
1614 return -1;
1615 }
1616 return 0;
1617}
1618
7bd9bcf3
MH
1619/*
1620 * Write sha1 into the open lockfile, then close the lockfile. On
1621 * errors, rollback the lockfile, fill in *err and
1622 * return -1.
1623 */
1624static int write_ref_to_lockfile(struct ref_lock *lock,
4417df8c 1625 const struct object_id *oid, struct strbuf *err)
7bd9bcf3
MH
1626{
1627 static char term = '\n';
1628 struct object *o;
1629 int fd;
1630
c251c83d 1631 o = parse_object(oid);
7bd9bcf3
MH
1632 if (!o) {
1633 strbuf_addf(err,
0568c8e9 1634 "trying to write ref '%s' with nonexistent object %s",
4417df8c 1635 lock->ref_name, oid_to_hex(oid));
7bd9bcf3
MH
1636 unlock_ref(lock);
1637 return -1;
1638 }
1639 if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
1640 strbuf_addf(err,
0568c8e9 1641 "trying to write non-commit object %s to branch '%s'",
4417df8c 1642 oid_to_hex(oid), lock->ref_name);
7bd9bcf3
MH
1643 unlock_ref(lock);
1644 return -1;
1645 }
1646 fd = get_lock_file_fd(lock->lk);
4417df8c 1647 if (write_in_full(fd, oid_to_hex(oid), GIT_SHA1_HEXSZ) != GIT_SHA1_HEXSZ ||
7bd9bcf3
MH
1648 write_in_full(fd, &term, 1) != 1 ||
1649 close_ref(lock) < 0) {
1650 strbuf_addf(err,
0568c8e9 1651 "couldn't write '%s'", get_lock_file_path(lock->lk));
7bd9bcf3
MH
1652 unlock_ref(lock);
1653 return -1;
1654 }
1655 return 0;
1656}
1657
1658/*
1659 * Commit a change to a loose reference that has already been written
1660 * to the loose reference lockfile. Also update the reflogs if
1661 * necessary, using the specified lockmsg (which can be NULL).
1662 */
f18a7892
MH
1663static int commit_ref_update(struct files_ref_store *refs,
1664 struct ref_lock *lock,
4417df8c 1665 const struct object_id *oid, const char *logmsg,
5d9b2de4 1666 struct strbuf *err)
7bd9bcf3 1667{
32c597e7 1668 files_assert_main_repository(refs, "commit_ref_update");
00eebe35
MH
1669
1670 clear_loose_ref_cache(refs);
802de3da 1671 if (files_log_ref_write(refs, lock->ref_name,
4417df8c 1672 &lock->old_oid, oid,
81b1b6d4 1673 logmsg, 0, err)) {
7bd9bcf3 1674 char *old_msg = strbuf_detach(err, NULL);
0568c8e9 1675 strbuf_addf(err, "cannot update the ref '%s': %s",
7bd9bcf3
MH
1676 lock->ref_name, old_msg);
1677 free(old_msg);
1678 unlock_ref(lock);
1679 return -1;
1680 }
7a418f3a
MH
1681
1682 if (strcmp(lock->ref_name, "HEAD") != 0) {
7bd9bcf3
MH
1683 /*
1684 * Special hack: If a branch is updated directly and HEAD
1685 * points to it (may happen on the remote side of a push
1686 * for example) then logically the HEAD reflog should be
1687 * updated too.
1688 * A generic solution implies reverse symref information,
1689 * but finding all symrefs pointing to the given branch
1690 * would be rather costly for this rare event (the direct
1691 * update of a branch) to be worth it. So let's cheat and
1692 * check with HEAD only which should cover 99% of all usage
1693 * scenarios (even 100% of the default ones).
1694 */
4417df8c 1695 struct object_id head_oid;
7bd9bcf3
MH
1696 int head_flag;
1697 const char *head_ref;
7a418f3a 1698
2f40e954
NTND
1699 head_ref = refs_resolve_ref_unsafe(&refs->base, "HEAD",
1700 RESOLVE_REF_READING,
4417df8c 1701 head_oid.hash, &head_flag);
7bd9bcf3
MH
1702 if (head_ref && (head_flag & REF_ISSYMREF) &&
1703 !strcmp(head_ref, lock->ref_name)) {
1704 struct strbuf log_err = STRBUF_INIT;
802de3da 1705 if (files_log_ref_write(refs, "HEAD",
4417df8c 1706 &lock->old_oid, oid,
802de3da 1707 logmsg, 0, &log_err)) {
7bd9bcf3
MH
1708 error("%s", log_err.buf);
1709 strbuf_release(&log_err);
1710 }
1711 }
1712 }
7a418f3a 1713
7bd9bcf3 1714 if (commit_ref(lock)) {
0568c8e9 1715 strbuf_addf(err, "couldn't set '%s'", lock->ref_name);
7bd9bcf3
MH
1716 unlock_ref(lock);
1717 return -1;
1718 }
1719
1720 unlock_ref(lock);
1721 return 0;
1722}
1723
370e5ad6 1724static int create_ref_symlink(struct ref_lock *lock, const char *target)
7bd9bcf3 1725{
370e5ad6 1726 int ret = -1;
7bd9bcf3 1727#ifndef NO_SYMLINK_HEAD
370e5ad6
JK
1728 char *ref_path = get_locked_file_path(lock->lk);
1729 unlink(ref_path);
1730 ret = symlink(target, ref_path);
1731 free(ref_path);
1732
1733 if (ret)
7bd9bcf3 1734 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
7bd9bcf3 1735#endif
370e5ad6
JK
1736 return ret;
1737}
7bd9bcf3 1738
802de3da
NTND
1739static void update_symref_reflog(struct files_ref_store *refs,
1740 struct ref_lock *lock, const char *refname,
370e5ad6
JK
1741 const char *target, const char *logmsg)
1742{
1743 struct strbuf err = STRBUF_INIT;
4417df8c 1744 struct object_id new_oid;
2f40e954
NTND
1745 if (logmsg &&
1746 !refs_read_ref_full(&refs->base, target,
4417df8c 1747 RESOLVE_REF_READING, new_oid.hash, NULL) &&
1748 files_log_ref_write(refs, refname, &lock->old_oid,
1749 &new_oid, logmsg, 0, &err)) {
7bd9bcf3
MH
1750 error("%s", err.buf);
1751 strbuf_release(&err);
1752 }
370e5ad6 1753}
7bd9bcf3 1754
802de3da
NTND
1755static int create_symref_locked(struct files_ref_store *refs,
1756 struct ref_lock *lock, const char *refname,
370e5ad6
JK
1757 const char *target, const char *logmsg)
1758{
1759 if (prefer_symlink_refs && !create_ref_symlink(lock, target)) {
802de3da 1760 update_symref_reflog(refs, lock, refname, target, logmsg);
370e5ad6
JK
1761 return 0;
1762 }
1763
1764 if (!fdopen_lock_file(lock->lk, "w"))
1765 return error("unable to fdopen %s: %s",
1766 lock->lk->tempfile.filename.buf, strerror(errno));
1767
802de3da 1768 update_symref_reflog(refs, lock, refname, target, logmsg);
396da8f7 1769
370e5ad6
JK
1770 /* no error check; commit_ref will check ferror */
1771 fprintf(lock->lk->tempfile.fp, "ref: %s\n", target);
1772 if (commit_ref(lock) < 0)
1773 return error("unable to write symref for %s: %s", refname,
1774 strerror(errno));
7bd9bcf3
MH
1775 return 0;
1776}
1777
284689ba
MH
1778static int files_create_symref(struct ref_store *ref_store,
1779 const char *refname, const char *target,
1780 const char *logmsg)
370e5ad6 1781{
7eb27cdf 1782 struct files_ref_store *refs =
9e7ec634 1783 files_downcast(ref_store, REF_STORE_WRITE, "create_symref");
370e5ad6
JK
1784 struct strbuf err = STRBUF_INIT;
1785 struct ref_lock *lock;
1786 int ret;
1787
7eb27cdf
MH
1788 lock = lock_ref_sha1_basic(refs, refname, NULL,
1789 NULL, NULL, REF_NODEREF, NULL,
370e5ad6
JK
1790 &err);
1791 if (!lock) {
1792 error("%s", err.buf);
1793 strbuf_release(&err);
1794 return -1;
1795 }
1796
802de3da 1797 ret = create_symref_locked(refs, lock, refname, target, logmsg);
370e5ad6
JK
1798 unlock_ref(lock);
1799 return ret;
1800}
1801
e3688bd6
DT
1802static int files_reflog_exists(struct ref_store *ref_store,
1803 const char *refname)
7bd9bcf3 1804{
802de3da 1805 struct files_ref_store *refs =
9e7ec634 1806 files_downcast(ref_store, REF_STORE_READ, "reflog_exists");
e9dcc305 1807 struct strbuf sb = STRBUF_INIT;
7bd9bcf3 1808 struct stat st;
e9dcc305 1809 int ret;
7bd9bcf3 1810
802de3da 1811 files_reflog_path(refs, &sb, refname);
e9dcc305
NTND
1812 ret = !lstat(sb.buf, &st) && S_ISREG(st.st_mode);
1813 strbuf_release(&sb);
1814 return ret;
7bd9bcf3
MH
1815}
1816
e3688bd6
DT
1817static int files_delete_reflog(struct ref_store *ref_store,
1818 const char *refname)
7bd9bcf3 1819{
802de3da 1820 struct files_ref_store *refs =
9e7ec634 1821 files_downcast(ref_store, REF_STORE_WRITE, "delete_reflog");
e9dcc305
NTND
1822 struct strbuf sb = STRBUF_INIT;
1823 int ret;
1824
802de3da 1825 files_reflog_path(refs, &sb, refname);
e9dcc305
NTND
1826 ret = remove_path(sb.buf);
1827 strbuf_release(&sb);
1828 return ret;
7bd9bcf3
MH
1829}
1830
1831static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data)
1832{
9461d272 1833 struct object_id ooid, noid;
7bd9bcf3 1834 char *email_end, *message;
dddbad72 1835 timestamp_t timestamp;
7bd9bcf3 1836 int tz;
43bc3b6c 1837 const char *p = sb->buf;
7bd9bcf3
MH
1838
1839 /* old SP new SP name <email> SP time TAB msg LF */
43bc3b6c 1840 if (!sb->len || sb->buf[sb->len - 1] != '\n' ||
1841 parse_oid_hex(p, &ooid, &p) || *p++ != ' ' ||
1842 parse_oid_hex(p, &noid, &p) || *p++ != ' ' ||
1843 !(email_end = strchr(p, '>')) ||
7bd9bcf3 1844 email_end[1] != ' ' ||
1aeb7e75 1845 !(timestamp = parse_timestamp(email_end + 2, &message, 10)) ||
7bd9bcf3
MH
1846 !message || message[0] != ' ' ||
1847 (message[1] != '+' && message[1] != '-') ||
1848 !isdigit(message[2]) || !isdigit(message[3]) ||
1849 !isdigit(message[4]) || !isdigit(message[5]))
1850 return 0; /* corrupt? */
1851 email_end[1] = '\0';
1852 tz = strtol(message + 1, NULL, 10);
1853 if (message[6] != '\t')
1854 message += 6;
1855 else
1856 message += 7;
43bc3b6c 1857 return fn(&ooid, &noid, p, timestamp, tz, message, cb_data);
7bd9bcf3
MH
1858}
1859
1860static char *find_beginning_of_line(char *bob, char *scan)
1861{
1862 while (bob < scan && *(--scan) != '\n')
1863 ; /* keep scanning backwards */
1864 /*
1865 * Return either beginning of the buffer, or LF at the end of
1866 * the previous line.
1867 */
1868 return scan;
1869}
1870
e3688bd6
DT
1871static int files_for_each_reflog_ent_reverse(struct ref_store *ref_store,
1872 const char *refname,
1873 each_reflog_ent_fn fn,
1874 void *cb_data)
7bd9bcf3 1875{
802de3da 1876 struct files_ref_store *refs =
9e7ec634
NTND
1877 files_downcast(ref_store, REF_STORE_READ,
1878 "for_each_reflog_ent_reverse");
7bd9bcf3
MH
1879 struct strbuf sb = STRBUF_INIT;
1880 FILE *logfp;
1881 long pos;
1882 int ret = 0, at_tail = 1;
1883
802de3da 1884 files_reflog_path(refs, &sb, refname);
e9dcc305
NTND
1885 logfp = fopen(sb.buf, "r");
1886 strbuf_release(&sb);
7bd9bcf3
MH
1887 if (!logfp)
1888 return -1;
1889
1890 /* Jump to the end */
1891 if (fseek(logfp, 0, SEEK_END) < 0)
be686f03
RS
1892 ret = error("cannot seek back reflog for %s: %s",
1893 refname, strerror(errno));
7bd9bcf3
MH
1894 pos = ftell(logfp);
1895 while (!ret && 0 < pos) {
1896 int cnt;
1897 size_t nread;
1898 char buf[BUFSIZ];
1899 char *endp, *scanp;
1900
1901 /* Fill next block from the end */
1902 cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos;
be686f03
RS
1903 if (fseek(logfp, pos - cnt, SEEK_SET)) {
1904 ret = error("cannot seek back reflog for %s: %s",
1905 refname, strerror(errno));
1906 break;
1907 }
7bd9bcf3 1908 nread = fread(buf, cnt, 1, logfp);
be686f03
RS
1909 if (nread != 1) {
1910 ret = error("cannot read %d bytes from reflog for %s: %s",
1911 cnt, refname, strerror(errno));
1912 break;
1913 }
7bd9bcf3
MH
1914 pos -= cnt;
1915
1916 scanp = endp = buf + cnt;
1917 if (at_tail && scanp[-1] == '\n')
1918 /* Looking at the final LF at the end of the file */
1919 scanp--;
1920 at_tail = 0;
1921
1922 while (buf < scanp) {
1923 /*
1924 * terminating LF of the previous line, or the beginning
1925 * of the buffer.
1926 */
1927 char *bp;
1928
1929 bp = find_beginning_of_line(buf, scanp);
1930
1931 if (*bp == '\n') {
1932 /*
1933 * The newline is the end of the previous line,
1934 * so we know we have complete line starting
1935 * at (bp + 1). Prefix it onto any prior data
1936 * we collected for the line and process it.
1937 */
1938 strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1));
1939 scanp = bp;
1940 endp = bp + 1;
1941 ret = show_one_reflog_ent(&sb, fn, cb_data);
1942 strbuf_reset(&sb);
1943 if (ret)
1944 break;
1945 } else if (!pos) {
1946 /*
1947 * We are at the start of the buffer, and the
1948 * start of the file; there is no previous
1949 * line, and we have everything for this one.
1950 * Process it, and we can end the loop.
1951 */
1952 strbuf_splice(&sb, 0, 0, buf, endp - buf);
1953 ret = show_one_reflog_ent(&sb, fn, cb_data);
1954 strbuf_reset(&sb);
1955 break;
1956 }
1957
1958 if (bp == buf) {
1959 /*
1960 * We are at the start of the buffer, and there
1961 * is more file to read backwards. Which means
1962 * we are in the middle of a line. Note that we
1963 * may get here even if *bp was a newline; that
1964 * just means we are at the exact end of the
1965 * previous line, rather than some spot in the
1966 * middle.
1967 *
1968 * Save away what we have to be combined with
1969 * the data from the next read.
1970 */
1971 strbuf_splice(&sb, 0, 0, buf, endp - buf);
1972 break;
1973 }
1974 }
1975
1976 }
1977 if (!ret && sb.len)
1978 die("BUG: reverse reflog parser had leftover data");
1979
1980 fclose(logfp);
1981 strbuf_release(&sb);
1982 return ret;
1983}
1984
e3688bd6
DT
1985static int files_for_each_reflog_ent(struct ref_store *ref_store,
1986 const char *refname,
1987 each_reflog_ent_fn fn, void *cb_data)
7bd9bcf3 1988{
802de3da 1989 struct files_ref_store *refs =
9e7ec634
NTND
1990 files_downcast(ref_store, REF_STORE_READ,
1991 "for_each_reflog_ent");
7bd9bcf3
MH
1992 FILE *logfp;
1993 struct strbuf sb = STRBUF_INIT;
1994 int ret = 0;
1995
802de3da 1996 files_reflog_path(refs, &sb, refname);
e9dcc305
NTND
1997 logfp = fopen(sb.buf, "r");
1998 strbuf_release(&sb);
7bd9bcf3
MH
1999 if (!logfp)
2000 return -1;
2001
2002 while (!ret && !strbuf_getwholeline(&sb, logfp, '\n'))
2003 ret = show_one_reflog_ent(&sb, fn, cb_data);
2004 fclose(logfp);
2005 strbuf_release(&sb);
2006 return ret;
2007}
7bd9bcf3 2008
2880d16f
MH
2009struct files_reflog_iterator {
2010 struct ref_iterator base;
7bd9bcf3 2011
2f40e954 2012 struct ref_store *ref_store;
2880d16f
MH
2013 struct dir_iterator *dir_iterator;
2014 struct object_id oid;
2015};
7bd9bcf3 2016
2880d16f
MH
2017static int files_reflog_iterator_advance(struct ref_iterator *ref_iterator)
2018{
2019 struct files_reflog_iterator *iter =
2020 (struct files_reflog_iterator *)ref_iterator;
2021 struct dir_iterator *diter = iter->dir_iterator;
2022 int ok;
2023
2024 while ((ok = dir_iterator_advance(diter)) == ITER_OK) {
2025 int flags;
2026
2027 if (!S_ISREG(diter->st.st_mode))
7bd9bcf3 2028 continue;
2880d16f
MH
2029 if (diter->basename[0] == '.')
2030 continue;
2031 if (ends_with(diter->basename, ".lock"))
7bd9bcf3 2032 continue;
7bd9bcf3 2033
2f40e954
NTND
2034 if (refs_read_ref_full(iter->ref_store,
2035 diter->relative_path, 0,
2036 iter->oid.hash, &flags)) {
2880d16f
MH
2037 error("bad ref for %s", diter->path.buf);
2038 continue;
7bd9bcf3 2039 }
2880d16f
MH
2040
2041 iter->base.refname = diter->relative_path;
2042 iter->base.oid = &iter->oid;
2043 iter->base.flags = flags;
2044 return ITER_OK;
7bd9bcf3 2045 }
2880d16f
MH
2046
2047 iter->dir_iterator = NULL;
2048 if (ref_iterator_abort(ref_iterator) == ITER_ERROR)
2049 ok = ITER_ERROR;
2050 return ok;
2051}
2052
2053static int files_reflog_iterator_peel(struct ref_iterator *ref_iterator,
2054 struct object_id *peeled)
2055{
2056 die("BUG: ref_iterator_peel() called for reflog_iterator");
2057}
2058
2059static int files_reflog_iterator_abort(struct ref_iterator *ref_iterator)
2060{
2061 struct files_reflog_iterator *iter =
2062 (struct files_reflog_iterator *)ref_iterator;
2063 int ok = ITER_DONE;
2064
2065 if (iter->dir_iterator)
2066 ok = dir_iterator_abort(iter->dir_iterator);
2067
2068 base_ref_iterator_free(ref_iterator);
2069 return ok;
2070}
2071
2072static struct ref_iterator_vtable files_reflog_iterator_vtable = {
2073 files_reflog_iterator_advance,
2074 files_reflog_iterator_peel,
2075 files_reflog_iterator_abort
2076};
2077
e3688bd6 2078static struct ref_iterator *files_reflog_iterator_begin(struct ref_store *ref_store)
2880d16f 2079{
802de3da 2080 struct files_ref_store *refs =
9e7ec634
NTND
2081 files_downcast(ref_store, REF_STORE_READ,
2082 "reflog_iterator_begin");
2880d16f
MH
2083 struct files_reflog_iterator *iter = xcalloc(1, sizeof(*iter));
2084 struct ref_iterator *ref_iterator = &iter->base;
e9dcc305 2085 struct strbuf sb = STRBUF_INIT;
2880d16f
MH
2086
2087 base_ref_iterator_init(ref_iterator, &files_reflog_iterator_vtable);
802de3da 2088 files_reflog_path(refs, &sb, NULL);
e9dcc305 2089 iter->dir_iterator = dir_iterator_begin(sb.buf);
2f40e954 2090 iter->ref_store = ref_store;
e9dcc305 2091 strbuf_release(&sb);
2880d16f 2092 return ref_iterator;
7bd9bcf3
MH
2093}
2094
165056b2 2095/*
92b1551b
MH
2096 * If update is a direct update of head_ref (the reference pointed to
2097 * by HEAD), then add an extra REF_LOG_ONLY update for HEAD.
2098 */
2099static int split_head_update(struct ref_update *update,
2100 struct ref_transaction *transaction,
2101 const char *head_ref,
2102 struct string_list *affected_refnames,
2103 struct strbuf *err)
2104{
2105 struct string_list_item *item;
2106 struct ref_update *new_update;
2107
2108 if ((update->flags & REF_LOG_ONLY) ||
2109 (update->flags & REF_ISPRUNING) ||
2110 (update->flags & REF_UPDATE_VIA_HEAD))
2111 return 0;
2112
2113 if (strcmp(update->refname, head_ref))
2114 return 0;
2115
2116 /*
2117 * First make sure that HEAD is not already in the
2118 * transaction. This insertion is O(N) in the transaction
2119 * size, but it happens at most once per transaction.
2120 */
2121 item = string_list_insert(affected_refnames, "HEAD");
2122 if (item->util) {
2123 /* An entry already existed */
2124 strbuf_addf(err,
2125 "multiple updates for 'HEAD' (including one "
2126 "via its referent '%s') are not allowed",
2127 update->refname);
2128 return TRANSACTION_NAME_CONFLICT;
2129 }
2130
2131 new_update = ref_transaction_add_update(
2132 transaction, "HEAD",
2133 update->flags | REF_LOG_ONLY | REF_NODEREF,
98491298 2134 update->new_oid.hash, update->old_oid.hash,
92b1551b
MH
2135 update->msg);
2136
2137 item->util = new_update;
2138
2139 return 0;
2140}
2141
2142/*
2143 * update is for a symref that points at referent and doesn't have
2144 * REF_NODEREF set. Split it into two updates:
2145 * - The original update, but with REF_LOG_ONLY and REF_NODEREF set
2146 * - A new, separate update for the referent reference
2147 * Note that the new update will itself be subject to splitting when
2148 * the iteration gets to it.
2149 */
fcc42ea0
MH
2150static int split_symref_update(struct files_ref_store *refs,
2151 struct ref_update *update,
92b1551b
MH
2152 const char *referent,
2153 struct ref_transaction *transaction,
2154 struct string_list *affected_refnames,
2155 struct strbuf *err)
2156{
2157 struct string_list_item *item;
2158 struct ref_update *new_update;
2159 unsigned int new_flags;
2160
2161 /*
2162 * First make sure that referent is not already in the
2163 * transaction. This insertion is O(N) in the transaction
2164 * size, but it happens at most once per symref in a
2165 * transaction.
2166 */
2167 item = string_list_insert(affected_refnames, referent);
2168 if (item->util) {
2169 /* An entry already existed */
2170 strbuf_addf(err,
2171 "multiple updates for '%s' (including one "
2172 "via symref '%s') are not allowed",
2173 referent, update->refname);
2174 return TRANSACTION_NAME_CONFLICT;
2175 }
2176
2177 new_flags = update->flags;
2178 if (!strcmp(update->refname, "HEAD")) {
2179 /*
2180 * Record that the new update came via HEAD, so that
2181 * when we process it, split_head_update() doesn't try
2182 * to add another reflog update for HEAD. Note that
2183 * this bit will be propagated if the new_update
2184 * itself needs to be split.
2185 */
2186 new_flags |= REF_UPDATE_VIA_HEAD;
2187 }
2188
2189 new_update = ref_transaction_add_update(
2190 transaction, referent, new_flags,
98491298 2191 update->new_oid.hash, update->old_oid.hash,
92b1551b
MH
2192 update->msg);
2193
6e30b2f6
MH
2194 new_update->parent_update = update;
2195
2196 /*
2197 * Change the symbolic ref update to log only. Also, it
2198 * doesn't need to check its old SHA-1 value, as that will be
2199 * done when new_update is processed.
2200 */
92b1551b 2201 update->flags |= REF_LOG_ONLY | REF_NODEREF;
6e30b2f6 2202 update->flags &= ~REF_HAVE_OLD;
92b1551b
MH
2203
2204 item->util = new_update;
2205
2206 return 0;
2207}
2208
6e30b2f6
MH
2209/*
2210 * Return the refname under which update was originally requested.
2211 */
2212static const char *original_update_refname(struct ref_update *update)
2213{
2214 while (update->parent_update)
2215 update = update->parent_update;
2216
2217 return update->refname;
2218}
2219
e3f51039
MH
2220/*
2221 * Check whether the REF_HAVE_OLD and old_oid values stored in update
2222 * are consistent with oid, which is the reference's current value. If
2223 * everything is OK, return 0; otherwise, write an error message to
2224 * err and return -1.
2225 */
2226static int check_old_oid(struct ref_update *update, struct object_id *oid,
2227 struct strbuf *err)
2228{
2229 if (!(update->flags & REF_HAVE_OLD) ||
98491298 2230 !oidcmp(oid, &update->old_oid))
e3f51039
MH
2231 return 0;
2232
98491298 2233 if (is_null_oid(&update->old_oid))
e3f51039
MH
2234 strbuf_addf(err, "cannot lock ref '%s': "
2235 "reference already exists",
2236 original_update_refname(update));
2237 else if (is_null_oid(oid))
2238 strbuf_addf(err, "cannot lock ref '%s': "
2239 "reference is missing but expected %s",
2240 original_update_refname(update),
98491298 2241 oid_to_hex(&update->old_oid));
e3f51039
MH
2242 else
2243 strbuf_addf(err, "cannot lock ref '%s': "
2244 "is at %s but expected %s",
2245 original_update_refname(update),
2246 oid_to_hex(oid),
98491298 2247 oid_to_hex(&update->old_oid));
e3f51039
MH
2248
2249 return -1;
2250}
2251
92b1551b
MH
2252/*
2253 * Prepare for carrying out update:
2254 * - Lock the reference referred to by update.
2255 * - Read the reference under lock.
2256 * - Check that its old SHA-1 value (if specified) is correct, and in
2257 * any case record it in update->lock->old_oid for later use when
2258 * writing the reflog.
2259 * - If it is a symref update without REF_NODEREF, split it up into a
2260 * REF_LOG_ONLY update of the symref and add a separate update for
2261 * the referent to transaction.
2262 * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY
2263 * update of HEAD.
165056b2 2264 */
b3bbbc5c
MH
2265static int lock_ref_for_update(struct files_ref_store *refs,
2266 struct ref_update *update,
165056b2 2267 struct ref_transaction *transaction,
92b1551b 2268 const char *head_ref,
165056b2
MH
2269 struct string_list *affected_refnames,
2270 struct strbuf *err)
2271{
92b1551b
MH
2272 struct strbuf referent = STRBUF_INIT;
2273 int mustexist = (update->flags & REF_HAVE_OLD) &&
98491298 2274 !is_null_oid(&update->old_oid);
165056b2 2275 int ret;
92b1551b 2276 struct ref_lock *lock;
165056b2 2277
32c597e7 2278 files_assert_main_repository(refs, "lock_ref_for_update");
b3bbbc5c 2279
98491298 2280 if ((update->flags & REF_HAVE_NEW) && is_null_oid(&update->new_oid))
165056b2 2281 update->flags |= REF_DELETING;
92b1551b
MH
2282
2283 if (head_ref) {
2284 ret = split_head_update(update, transaction, head_ref,
2285 affected_refnames, err);
2286 if (ret)
2287 return ret;
2288 }
2289
f7b0a987 2290 ret = lock_raw_ref(refs, update->refname, mustexist,
92b1551b 2291 affected_refnames, NULL,
7d618264 2292 &lock, &referent,
92b1551b 2293 &update->type, err);
92b1551b 2294 if (ret) {
165056b2
MH
2295 char *reason;
2296
165056b2
MH
2297 reason = strbuf_detach(err, NULL);
2298 strbuf_addf(err, "cannot lock ref '%s': %s",
e3f51039 2299 original_update_refname(update), reason);
165056b2
MH
2300 free(reason);
2301 return ret;
2302 }
92b1551b 2303
7d618264 2304 update->backend_data = lock;
92b1551b 2305
8169d0d0 2306 if (update->type & REF_ISSYMREF) {
6e30b2f6
MH
2307 if (update->flags & REF_NODEREF) {
2308 /*
2309 * We won't be reading the referent as part of
2310 * the transaction, so we have to read it here
2311 * to record and possibly check old_sha1:
2312 */
2f40e954
NTND
2313 if (refs_read_ref_full(&refs->base,
2314 referent.buf, 0,
2315 lock->old_oid.hash, NULL)) {
6e30b2f6
MH
2316 if (update->flags & REF_HAVE_OLD) {
2317 strbuf_addf(err, "cannot lock ref '%s': "
e3f51039
MH
2318 "error reading reference",
2319 original_update_refname(update));
2320 return -1;
6e30b2f6 2321 }
e3f51039 2322 } else if (check_old_oid(update, &lock->old_oid, err)) {
8169d0d0 2323 return TRANSACTION_GENERIC_ERROR;
8169d0d0 2324 }
6e30b2f6
MH
2325 } else {
2326 /*
2327 * Create a new update for the reference this
2328 * symref is pointing at. Also, we will record
2329 * and verify old_sha1 for this update as part
2330 * of processing the split-off update, so we
2331 * don't have to do it here.
2332 */
fcc42ea0
MH
2333 ret = split_symref_update(refs, update,
2334 referent.buf, transaction,
92b1551b
MH
2335 affected_refnames, err);
2336 if (ret)
2337 return ret;
2338 }
6e30b2f6
MH
2339 } else {
2340 struct ref_update *parent_update;
8169d0d0 2341
e3f51039
MH
2342 if (check_old_oid(update, &lock->old_oid, err))
2343 return TRANSACTION_GENERIC_ERROR;
2344
6e30b2f6
MH
2345 /*
2346 * If this update is happening indirectly because of a
2347 * symref update, record the old SHA-1 in the parent
2348 * update:
2349 */
2350 for (parent_update = update->parent_update;
2351 parent_update;
2352 parent_update = parent_update->parent_update) {
7d618264
DT
2353 struct ref_lock *parent_lock = parent_update->backend_data;
2354 oidcpy(&parent_lock->old_oid, &lock->old_oid);
6e30b2f6 2355 }
92b1551b
MH
2356 }
2357
165056b2
MH
2358 if ((update->flags & REF_HAVE_NEW) &&
2359 !(update->flags & REF_DELETING) &&
2360 !(update->flags & REF_LOG_ONLY)) {
92b1551b 2361 if (!(update->type & REF_ISSYMREF) &&
98491298 2362 !oidcmp(&lock->old_oid, &update->new_oid)) {
165056b2
MH
2363 /*
2364 * The reference already has the desired
2365 * value, so we don't need to write it.
2366 */
4417df8c 2367 } else if (write_ref_to_lockfile(lock, &update->new_oid,
165056b2
MH
2368 err)) {
2369 char *write_err = strbuf_detach(err, NULL);
2370
2371 /*
2372 * The lock was freed upon failure of
2373 * write_ref_to_lockfile():
2374 */
7d618264 2375 update->backend_data = NULL;
165056b2 2376 strbuf_addf(err,
e3f51039 2377 "cannot update ref '%s': %s",
165056b2
MH
2378 update->refname, write_err);
2379 free(write_err);
2380 return TRANSACTION_GENERIC_ERROR;
2381 } else {
2382 update->flags |= REF_NEEDS_COMMIT;
2383 }
2384 }
2385 if (!(update->flags & REF_NEEDS_COMMIT)) {
2386 /*
2387 * We didn't call write_ref_to_lockfile(), so
2388 * the lockfile is still open. Close it to
2389 * free up the file descriptor:
2390 */
92b1551b 2391 if (close_ref(lock)) {
165056b2
MH
2392 strbuf_addf(err, "couldn't close '%s.lock'",
2393 update->refname);
2394 return TRANSACTION_GENERIC_ERROR;
2395 }
2396 }
2397 return 0;
2398}
2399
dc39e099
MH
2400struct files_transaction_backend_data {
2401 struct ref_transaction *packed_transaction;
2402 int packed_refs_locked;
2403};
2404
c0ca9357
MH
2405/*
2406 * Unlock any references in `transaction` that are still locked, and
2407 * mark the transaction closed.
2408 */
dc39e099
MH
2409static void files_transaction_cleanup(struct files_ref_store *refs,
2410 struct ref_transaction *transaction)
c0ca9357
MH
2411{
2412 size_t i;
dc39e099
MH
2413 struct files_transaction_backend_data *backend_data =
2414 transaction->backend_data;
2415 struct strbuf err = STRBUF_INIT;
c0ca9357
MH
2416
2417 for (i = 0; i < transaction->nr; i++) {
2418 struct ref_update *update = transaction->updates[i];
2419 struct ref_lock *lock = update->backend_data;
2420
2421 if (lock) {
2422 unlock_ref(lock);
2423 update->backend_data = NULL;
2424 }
2425 }
2426
dc39e099
MH
2427 if (backend_data->packed_transaction &&
2428 ref_transaction_abort(backend_data->packed_transaction, &err)) {
2429 error("error aborting transaction: %s", err.buf);
2430 strbuf_release(&err);
2431 }
2432
2433 if (backend_data->packed_refs_locked)
2434 packed_refs_unlock(refs->packed_ref_store);
2435
2436 free(backend_data);
2437
c0ca9357
MH
2438 transaction->state = REF_TRANSACTION_CLOSED;
2439}
2440
30173b88
MH
2441static int files_transaction_prepare(struct ref_store *ref_store,
2442 struct ref_transaction *transaction,
2443 struct strbuf *err)
7bd9bcf3 2444{
00eebe35 2445 struct files_ref_store *refs =
9e7ec634 2446 files_downcast(ref_store, REF_STORE_WRITE,
30173b88 2447 "ref_transaction_prepare");
43a2dfde
MH
2448 size_t i;
2449 int ret = 0;
7bd9bcf3 2450 struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
92b1551b
MH
2451 char *head_ref = NULL;
2452 int head_type;
2453 struct object_id head_oid;
dc39e099
MH
2454 struct files_transaction_backend_data *backend_data;
2455 struct ref_transaction *packed_transaction = NULL;
7bd9bcf3
MH
2456
2457 assert(err);
2458
c0ca9357
MH
2459 if (!transaction->nr)
2460 goto cleanup;
7bd9bcf3 2461
dc39e099
MH
2462 backend_data = xcalloc(1, sizeof(*backend_data));
2463 transaction->backend_data = backend_data;
2464
92b1551b
MH
2465 /*
2466 * Fail if a refname appears more than once in the
2467 * transaction. (If we end up splitting up any updates using
2468 * split_symref_update() or split_head_update(), those
2469 * functions will check that the new updates don't have the
2470 * same refname as any existing ones.)
2471 */
2472 for (i = 0; i < transaction->nr; i++) {
2473 struct ref_update *update = transaction->updates[i];
2474 struct string_list_item *item =
2475 string_list_append(&affected_refnames, update->refname);
2476
2477 /*
2478 * We store a pointer to update in item->util, but at
2479 * the moment we never use the value of this field
2480 * except to check whether it is non-NULL.
2481 */
2482 item->util = update;
2483 }
7bd9bcf3
MH
2484 string_list_sort(&affected_refnames);
2485 if (ref_update_reject_duplicates(&affected_refnames, err)) {
2486 ret = TRANSACTION_GENERIC_ERROR;
2487 goto cleanup;
2488 }
2489
92b1551b
MH
2490 /*
2491 * Special hack: If a branch is updated directly and HEAD
2492 * points to it (may happen on the remote side of a push
2493 * for example) then logically the HEAD reflog should be
2494 * updated too.
2495 *
2496 * A generic solution would require reverse symref lookups,
2497 * but finding all symrefs pointing to a given branch would be
2498 * rather costly for this rare event (the direct update of a
2499 * branch) to be worth it. So let's cheat and check with HEAD
2500 * only, which should cover 99% of all usage scenarios (even
2501 * 100% of the default ones).
2502 *
2503 * So if HEAD is a symbolic reference, then record the name of
2504 * the reference that it points to. If we see an update of
2505 * head_ref within the transaction, then split_head_update()
2506 * arranges for the reflog of HEAD to be updated, too.
2507 */
2f40e954
NTND
2508 head_ref = refs_resolve_refdup(ref_store, "HEAD",
2509 RESOLVE_REF_NO_RECURSE,
2510 head_oid.hash, &head_type);
92b1551b
MH
2511
2512 if (head_ref && !(head_type & REF_ISSYMREF)) {
6a83d902 2513 FREE_AND_NULL(head_ref);
92b1551b
MH
2514 }
2515
7bd9bcf3
MH
2516 /*
2517 * Acquire all locks, verify old values if provided, check
2518 * that new values are valid, and write new values to the
2519 * lockfiles, ready to be activated. Only keep one lockfile
2520 * open at a time to avoid running out of file descriptors.
30173b88
MH
2521 * Note that lock_ref_for_update() might append more updates
2522 * to the transaction.
7bd9bcf3 2523 */
efe47281
MH
2524 for (i = 0; i < transaction->nr; i++) {
2525 struct ref_update *update = transaction->updates[i];
7bd9bcf3 2526
b3bbbc5c
MH
2527 ret = lock_ref_for_update(refs, update, transaction,
2528 head_ref, &affected_refnames, err);
165056b2 2529 if (ret)
30173b88 2530 break;
dc39e099
MH
2531
2532 if (update->flags & REF_DELETING &&
2533 !(update->flags & REF_LOG_ONLY) &&
2534 !(update->flags & REF_ISPRUNING)) {
2535 /*
2536 * This reference has to be deleted from
2537 * packed-refs if it exists there.
2538 */
2539 if (!packed_transaction) {
2540 packed_transaction = ref_store_transaction_begin(
2541 refs->packed_ref_store, err);
2542 if (!packed_transaction) {
2543 ret = TRANSACTION_GENERIC_ERROR;
2544 goto cleanup;
2545 }
2546
2547 backend_data->packed_transaction =
2548 packed_transaction;
2549 }
2550
2551 ref_transaction_add_update(
2552 packed_transaction, update->refname,
2553 update->flags & ~REF_HAVE_OLD,
2554 update->new_oid.hash, update->old_oid.hash,
2555 NULL);
2556 }
2557 }
2558
2559 if (packed_transaction) {
2560 if (packed_refs_lock(refs->packed_ref_store, 0, err)) {
2561 ret = TRANSACTION_GENERIC_ERROR;
2562 goto cleanup;
2563 }
2564 backend_data->packed_refs_locked = 1;
2565 ret = ref_transaction_prepare(packed_transaction, err);
30173b88
MH
2566 }
2567
2568cleanup:
2569 free(head_ref);
2570 string_list_clear(&affected_refnames, 0);
2571
2572 if (ret)
dc39e099 2573 files_transaction_cleanup(refs, transaction);
30173b88
MH
2574 else
2575 transaction->state = REF_TRANSACTION_PREPARED;
2576
2577 return ret;
2578}
2579
2580static int files_transaction_finish(struct ref_store *ref_store,
2581 struct ref_transaction *transaction,
2582 struct strbuf *err)
2583{
2584 struct files_ref_store *refs =
2585 files_downcast(ref_store, 0, "ref_transaction_finish");
2586 size_t i;
2587 int ret = 0;
30173b88 2588 struct strbuf sb = STRBUF_INIT;
dc39e099
MH
2589 struct files_transaction_backend_data *backend_data;
2590 struct ref_transaction *packed_transaction;
2591
30173b88
MH
2592
2593 assert(err);
2594
2595 if (!transaction->nr) {
2596 transaction->state = REF_TRANSACTION_CLOSED;
2597 return 0;
7bd9bcf3 2598 }
7bd9bcf3 2599
dc39e099
MH
2600 backend_data = transaction->backend_data;
2601 packed_transaction = backend_data->packed_transaction;
2602
7bd9bcf3 2603 /* Perform updates first so live commits remain referenced */
efe47281
MH
2604 for (i = 0; i < transaction->nr; i++) {
2605 struct ref_update *update = transaction->updates[i];
7d618264 2606 struct ref_lock *lock = update->backend_data;
7bd9bcf3 2607
d99aa884
DT
2608 if (update->flags & REF_NEEDS_COMMIT ||
2609 update->flags & REF_LOG_ONLY) {
802de3da
NTND
2610 if (files_log_ref_write(refs,
2611 lock->ref_name,
4417df8c 2612 &lock->old_oid,
2613 &update->new_oid,
81b1b6d4
MH
2614 update->msg, update->flags,
2615 err)) {
92b1551b
MH
2616 char *old_msg = strbuf_detach(err, NULL);
2617
2618 strbuf_addf(err, "cannot update the ref '%s': %s",
2619 lock->ref_name, old_msg);
2620 free(old_msg);
2621 unlock_ref(lock);
7d618264 2622 update->backend_data = NULL;
7bd9bcf3
MH
2623 ret = TRANSACTION_GENERIC_ERROR;
2624 goto cleanup;
7bd9bcf3
MH
2625 }
2626 }
7bd9bcf3 2627 if (update->flags & REF_NEEDS_COMMIT) {
00eebe35 2628 clear_loose_ref_cache(refs);
92b1551b
MH
2629 if (commit_ref(lock)) {
2630 strbuf_addf(err, "couldn't set '%s'", lock->ref_name);
2631 unlock_ref(lock);
7d618264 2632 update->backend_data = NULL;
7bd9bcf3
MH
2633 ret = TRANSACTION_GENERIC_ERROR;
2634 goto cleanup;
7bd9bcf3
MH
2635 }
2636 }
2637 }
dc39e099
MH
2638
2639 /*
2640 * Perform deletes now that updates are safely completed.
2641 *
2642 * First delete any packed versions of the references, while
2643 * retaining the packed-refs lock:
2644 */
2645 if (packed_transaction) {
2646 ret = ref_transaction_commit(packed_transaction, err);
2647 ref_transaction_free(packed_transaction);
2648 packed_transaction = NULL;
2649 backend_data->packed_transaction = NULL;
2650 if (ret)
2651 goto cleanup;
2652 }
2653
2654 /* Now delete the loose versions of the references: */
efe47281
MH
2655 for (i = 0; i < transaction->nr; i++) {
2656 struct ref_update *update = transaction->updates[i];
7d618264 2657 struct ref_lock *lock = update->backend_data;
7bd9bcf3 2658
d99aa884
DT
2659 if (update->flags & REF_DELETING &&
2660 !(update->flags & REF_LOG_ONLY)) {
ce0af24d
MH
2661 if (!(update->type & REF_ISPACKED) ||
2662 update->type & REF_ISSYMREF) {
2663 /* It is a loose reference. */
e9dcc305 2664 strbuf_reset(&sb);
19e02f4f 2665 files_ref_path(refs, &sb, lock->ref_name);
e9dcc305 2666 if (unlink_or_msg(sb.buf, err)) {
ce0af24d
MH
2667 ret = TRANSACTION_GENERIC_ERROR;
2668 goto cleanup;
2669 }
44639777 2670 update->flags |= REF_DELETED_LOOSE;
7bd9bcf3 2671 }
7bd9bcf3
MH
2672 }
2673 }
2674
44639777 2675 /* Delete the reflogs of any references that were deleted: */
dc39e099
MH
2676 for (i = 0; i < transaction->nr; i++) {
2677 struct ref_update *update = transaction->updates[i];
2678 if (update->flags & REF_DELETING &&
2679 !(update->flags & REF_LOG_ONLY) &&
2680 !(update->flags & REF_ISPRUNING)) {
2681 strbuf_reset(&sb);
2682 files_reflog_path(refs, &sb, update->refname);
2683 if (!unlink_or_warn(sb.buf))
2684 try_remove_empty_parents(refs, update->refname,
2685 REMOVE_EMPTY_PARENTS_REFLOG);
2686 }
44639777
MH
2687 }
2688
00eebe35 2689 clear_loose_ref_cache(refs);
7bd9bcf3
MH
2690
2691cleanup:
dc39e099 2692 files_transaction_cleanup(refs, transaction);
7bd9bcf3 2693
44639777
MH
2694 for (i = 0; i < transaction->nr; i++) {
2695 struct ref_update *update = transaction->updates[i];
44639777
MH
2696
2697 if (update->flags & REF_DELETED_LOOSE) {
2698 /*
2699 * The loose reference was deleted. Delete any
2700 * empty parent directories. (Note that this
2701 * can only work because we have already
2702 * removed the lockfile.)
2703 */
802de3da 2704 try_remove_empty_parents(refs, update->refname,
44639777
MH
2705 REMOVE_EMPTY_PARENTS_REF);
2706 }
2707 }
2708
30173b88 2709 strbuf_release(&sb);
7bd9bcf3
MH
2710 return ret;
2711}
2712
30173b88
MH
2713static int files_transaction_abort(struct ref_store *ref_store,
2714 struct ref_transaction *transaction,
2715 struct strbuf *err)
2716{
dc39e099
MH
2717 struct files_ref_store *refs =
2718 files_downcast(ref_store, 0, "ref_transaction_abort");
2719
2720 files_transaction_cleanup(refs, transaction);
30173b88
MH
2721 return 0;
2722}
2723
7bd9bcf3
MH
2724static int ref_present(const char *refname,
2725 const struct object_id *oid, int flags, void *cb_data)
2726{
2727 struct string_list *affected_refnames = cb_data;
2728
2729 return string_list_has_string(affected_refnames, refname);
2730}
2731
fc681463
DT
2732static int files_initial_transaction_commit(struct ref_store *ref_store,
2733 struct ref_transaction *transaction,
2734 struct strbuf *err)
7bd9bcf3 2735{
d99825ab 2736 struct files_ref_store *refs =
9e7ec634
NTND
2737 files_downcast(ref_store, REF_STORE_WRITE,
2738 "initial_ref_transaction_commit");
43a2dfde
MH
2739 size_t i;
2740 int ret = 0;
7bd9bcf3 2741 struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
1444bfe0 2742 struct ref_transaction *packed_transaction = NULL;
7bd9bcf3
MH
2743
2744 assert(err);
2745
2746 if (transaction->state != REF_TRANSACTION_OPEN)
2747 die("BUG: commit called for transaction that is not open");
2748
2749 /* Fail if a refname appears more than once in the transaction: */
efe47281
MH
2750 for (i = 0; i < transaction->nr; i++)
2751 string_list_append(&affected_refnames,
2752 transaction->updates[i]->refname);
7bd9bcf3
MH
2753 string_list_sort(&affected_refnames);
2754 if (ref_update_reject_duplicates(&affected_refnames, err)) {
2755 ret = TRANSACTION_GENERIC_ERROR;
2756 goto cleanup;
2757 }
2758
2759 /*
2760 * It's really undefined to call this function in an active
2761 * repository or when there are existing references: we are
2762 * only locking and changing packed-refs, so (1) any
2763 * simultaneous processes might try to change a reference at
2764 * the same time we do, and (2) any existing loose versions of
2765 * the references that we are setting would have precedence
2766 * over our values. But some remote helpers create the remote
2767 * "HEAD" and "master" branches before calling this function,
2768 * so here we really only check that none of the references
2769 * that we are creating already exists.
2770 */
2f40e954
NTND
2771 if (refs_for_each_rawref(&refs->base, ref_present,
2772 &affected_refnames))
7bd9bcf3
MH
2773 die("BUG: initial ref transaction called with existing refs");
2774
1444bfe0
MH
2775 packed_transaction = ref_store_transaction_begin(refs->packed_ref_store, err);
2776 if (!packed_transaction) {
2777 ret = TRANSACTION_GENERIC_ERROR;
2778 goto cleanup;
2779 }
2780
efe47281
MH
2781 for (i = 0; i < transaction->nr; i++) {
2782 struct ref_update *update = transaction->updates[i];
7bd9bcf3
MH
2783
2784 if ((update->flags & REF_HAVE_OLD) &&
98491298 2785 !is_null_oid(&update->old_oid))
7bd9bcf3 2786 die("BUG: initial ref transaction with old_sha1 set");
7d2df051
NTND
2787 if (refs_verify_refname_available(&refs->base, update->refname,
2788 &affected_refnames, NULL,
2789 err)) {
7bd9bcf3
MH
2790 ret = TRANSACTION_NAME_CONFLICT;
2791 goto cleanup;
2792 }
1444bfe0
MH
2793
2794 /*
2795 * Add a reference creation for this reference to the
2796 * packed-refs transaction:
2797 */
2798 ref_transaction_add_update(packed_transaction, update->refname,
2799 update->flags & ~REF_HAVE_OLD,
2800 update->new_oid.hash, update->old_oid.hash,
2801 NULL);
7bd9bcf3
MH
2802 }
2803
c8bed835 2804 if (packed_refs_lock(refs->packed_ref_store, 0, err)) {
7bd9bcf3
MH
2805 ret = TRANSACTION_GENERIC_ERROR;
2806 goto cleanup;
2807 }
2808
1444bfe0 2809 if (initial_ref_transaction_commit(packed_transaction, err)) {
7bd9bcf3
MH
2810 ret = TRANSACTION_GENERIC_ERROR;
2811 goto cleanup;
2812 }
2813
2814cleanup:
1444bfe0
MH
2815 if (packed_transaction)
2816 ref_transaction_free(packed_transaction);
42c7f7ff 2817 packed_refs_unlock(refs->packed_ref_store);
7bd9bcf3
MH
2818 transaction->state = REF_TRANSACTION_CLOSED;
2819 string_list_clear(&affected_refnames, 0);
2820 return ret;
2821}
2822
2823struct expire_reflog_cb {
2824 unsigned int flags;
2825 reflog_expiry_should_prune_fn *should_prune_fn;
2826 void *policy_cb;
2827 FILE *newlog;
9461d272 2828 struct object_id last_kept_oid;
7bd9bcf3
MH
2829};
2830
9461d272 2831static int expire_reflog_ent(struct object_id *ooid, struct object_id *noid,
dddbad72 2832 const char *email, timestamp_t timestamp, int tz,
7bd9bcf3
MH
2833 const char *message, void *cb_data)
2834{
2835 struct expire_reflog_cb *cb = cb_data;
2836 struct expire_reflog_policy_cb *policy_cb = cb->policy_cb;
2837
2838 if (cb->flags & EXPIRE_REFLOGS_REWRITE)
9461d272 2839 ooid = &cb->last_kept_oid;
7bd9bcf3 2840
4322478a 2841 if ((*cb->should_prune_fn)(ooid, noid, email, timestamp, tz,
7bd9bcf3
MH
2842 message, policy_cb)) {
2843 if (!cb->newlog)
2844 printf("would prune %s", message);
2845 else if (cb->flags & EXPIRE_REFLOGS_VERBOSE)
2846 printf("prune %s", message);
2847 } else {
2848 if (cb->newlog) {
cb71f8bd 2849 fprintf(cb->newlog, "%s %s %s %"PRItime" %+05d\t%s",
9461d272 2850 oid_to_hex(ooid), oid_to_hex(noid),
7bd9bcf3 2851 email, timestamp, tz, message);
9461d272 2852 oidcpy(&cb->last_kept_oid, noid);
7bd9bcf3
MH
2853 }
2854 if (cb->flags & EXPIRE_REFLOGS_VERBOSE)
2855 printf("keep %s", message);
2856 }
2857 return 0;
2858}
2859
e3688bd6
DT
2860static int files_reflog_expire(struct ref_store *ref_store,
2861 const char *refname, const unsigned char *sha1,
2862 unsigned int flags,
2863 reflog_expiry_prepare_fn prepare_fn,
2864 reflog_expiry_should_prune_fn should_prune_fn,
2865 reflog_expiry_cleanup_fn cleanup_fn,
2866 void *policy_cb_data)
7bd9bcf3 2867{
7eb27cdf 2868 struct files_ref_store *refs =
9e7ec634 2869 files_downcast(ref_store, REF_STORE_WRITE, "reflog_expire");
7bd9bcf3
MH
2870 static struct lock_file reflog_lock;
2871 struct expire_reflog_cb cb;
2872 struct ref_lock *lock;
802de3da 2873 struct strbuf log_file_sb = STRBUF_INIT;
7bd9bcf3
MH
2874 char *log_file;
2875 int status = 0;
2876 int type;
2877 struct strbuf err = STRBUF_INIT;
4322478a 2878 struct object_id oid;
7bd9bcf3
MH
2879
2880 memset(&cb, 0, sizeof(cb));
2881 cb.flags = flags;
2882 cb.policy_cb = policy_cb_data;
2883 cb.should_prune_fn = should_prune_fn;
2884
2885 /*
2886 * The reflog file is locked by holding the lock on the
2887 * reference itself, plus we might need to update the
2888 * reference if --updateref was specified:
2889 */
7eb27cdf
MH
2890 lock = lock_ref_sha1_basic(refs, refname, sha1,
2891 NULL, NULL, REF_NODEREF,
41d796ed 2892 &type, &err);
7bd9bcf3
MH
2893 if (!lock) {
2894 error("cannot lock ref '%s': %s", refname, err.buf);
2895 strbuf_release(&err);
2896 return -1;
2897 }
2f40e954 2898 if (!refs_reflog_exists(ref_store, refname)) {
7bd9bcf3
MH
2899 unlock_ref(lock);
2900 return 0;
2901 }
2902
802de3da
NTND
2903 files_reflog_path(refs, &log_file_sb, refname);
2904 log_file = strbuf_detach(&log_file_sb, NULL);
7bd9bcf3
MH
2905 if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
2906 /*
2907 * Even though holding $GIT_DIR/logs/$reflog.lock has
2908 * no locking implications, we use the lock_file
2909 * machinery here anyway because it does a lot of the
2910 * work we need, including cleaning up if the program
2911 * exits unexpectedly.
2912 */
2913 if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) {
2914 struct strbuf err = STRBUF_INIT;
2915 unable_to_lock_message(log_file, errno, &err);
2916 error("%s", err.buf);
2917 strbuf_release(&err);
2918 goto failure;
2919 }
2920 cb.newlog = fdopen_lock_file(&reflog_lock, "w");
2921 if (!cb.newlog) {
2922 error("cannot fdopen %s (%s)",
2923 get_lock_file_path(&reflog_lock), strerror(errno));
2924 goto failure;
2925 }
2926 }
2927
4322478a 2928 hashcpy(oid.hash, sha1);
2929
2930 (*prepare_fn)(refname, &oid, cb.policy_cb);
2f40e954 2931 refs_for_each_reflog_ent(ref_store, refname, expire_reflog_ent, &cb);
7bd9bcf3
MH
2932 (*cleanup_fn)(cb.policy_cb);
2933
2934 if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
2935 /*
2936 * It doesn't make sense to adjust a reference pointed
2937 * to by a symbolic ref based on expiring entries in
2938 * the symbolic reference's reflog. Nor can we update
2939 * a reference if there are no remaining reflog
2940 * entries.
2941 */
2942 int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) &&
2943 !(type & REF_ISSYMREF) &&
9461d272 2944 !is_null_oid(&cb.last_kept_oid);
7bd9bcf3
MH
2945
2946 if (close_lock_file(&reflog_lock)) {
2947 status |= error("couldn't write %s: %s", log_file,
2948 strerror(errno));
2949 } else if (update &&
2950 (write_in_full(get_lock_file_fd(lock->lk),
9461d272 2951 oid_to_hex(&cb.last_kept_oid), GIT_SHA1_HEXSZ) != GIT_SHA1_HEXSZ ||
7bd9bcf3
MH
2952 write_str_in_full(get_lock_file_fd(lock->lk), "\n") != 1 ||
2953 close_ref(lock) < 0)) {
2954 status |= error("couldn't write %s",
2955 get_lock_file_path(lock->lk));
2956 rollback_lock_file(&reflog_lock);
2957 } else if (commit_lock_file(&reflog_lock)) {
e0048d3e 2958 status |= error("unable to write reflog '%s' (%s)",
7bd9bcf3
MH
2959 log_file, strerror(errno));
2960 } else if (update && commit_ref(lock)) {
2961 status |= error("couldn't set %s", lock->ref_name);
2962 }
2963 }
2964 free(log_file);
2965 unlock_ref(lock);
2966 return status;
2967
2968 failure:
2969 rollback_lock_file(&reflog_lock);
2970 free(log_file);
2971 unlock_ref(lock);
2972 return -1;
2973}
3dce444f 2974
6fb5acfd
DT
2975static int files_init_db(struct ref_store *ref_store, struct strbuf *err)
2976{
19e02f4f 2977 struct files_ref_store *refs =
9e7ec634 2978 files_downcast(ref_store, REF_STORE_WRITE, "init_db");
e9dcc305
NTND
2979 struct strbuf sb = STRBUF_INIT;
2980
6fb5acfd
DT
2981 /*
2982 * Create .git/refs/{heads,tags}
2983 */
19e02f4f 2984 files_ref_path(refs, &sb, "refs/heads");
e9dcc305
NTND
2985 safe_create_dir(sb.buf, 1);
2986
2987 strbuf_reset(&sb);
19e02f4f 2988 files_ref_path(refs, &sb, "refs/tags");
e9dcc305
NTND
2989 safe_create_dir(sb.buf, 1);
2990
2991 strbuf_release(&sb);
6fb5acfd
DT
2992 return 0;
2993}
2994
3dce444f
RS
2995struct ref_storage_be refs_be_files = {
2996 NULL,
00eebe35 2997 "files",
127b42a1 2998 files_ref_store_create,
6fb5acfd 2999 files_init_db,
30173b88
MH
3000 files_transaction_prepare,
3001 files_transaction_finish,
3002 files_transaction_abort,
fc681463 3003 files_initial_transaction_commit,
e1e33b72 3004
8231527e 3005 files_pack_refs,
bd427cf2 3006 files_peel_ref,
284689ba 3007 files_create_symref,
a27dcf89 3008 files_delete_refs,
9b6b40d9 3009 files_rename_ref,
8231527e 3010
1a769003 3011 files_ref_iterator_begin,
62665823 3012 files_read_raw_ref,
e3688bd6
DT
3013
3014 files_reflog_iterator_begin,
3015 files_for_each_reflog_ent,
3016 files_for_each_reflog_ent_reverse,
3017 files_reflog_exists,
3018 files_create_reflog,
3019 files_delete_reflog,
3020 files_reflog_expire
3dce444f 3021};