1 /*
2 * Copyright (C) the libgit2 contributors. All rights reserved.
3 *
4 * This file is part of libgit2, distributed under the GNU GPL v2 with
5 * a Linking Exception. For full terms see the included COPYING file.
6 */
7
8 #include "refs.h"
9 #include "hash.h"
10 #include "repository.h"
11 #include "futils.h"
12 #include "filebuf.h"
13 #include "pack.h"
14 #include "parse.h"
15 #include "reflog.h"
16 #include "refdb.h"
17 #include "iterator.h"
18 #include "sortedcache.h"
19 #include "signature.h"
20 #include "wildmatch.h"
21
22 #include <git2/tag.h>
23 #include <git2/object.h>
24 #include <git2/refdb.h>
25 #include <git2/branch.h>
26 #include <git2/sys/refdb_backend.h>
27 #include <git2/sys/refs.h>
28 #include <git2/sys/reflog.h>
29
30 #define DEFAULT_NESTING_LEVEL 5
31 #define MAX_NESTING_LEVEL 10
32
33 enum {
34 PACKREF_HAS_PEEL = 1,
35 PACKREF_WAS_LOOSE = 2,
36 PACKREF_CANNOT_PEEL = 4,
37 PACKREF_SHADOWED = 8,
38 };
39
40 enum {
41 PEELING_NONE = 0,
42 PEELING_STANDARD,
43 PEELING_FULL
44 };
45
46 struct packref {
47 git_oid oid;
48 git_oid peel;
49 char flags;
50 char name[GIT_FLEX_ARRAY];
51 };
52
53 typedef struct refdb_fs_backend {
54 git_refdb_backend parent;
55
56 git_repository *repo;
57 /* path to git directory */
58 char *gitpath;
59 /* path to common objects' directory */
60 char *commonpath;
61
62 git_sortedcache *refcache;
63 int peeling_mode;
64 git_iterator_flag_t iterator_flags;
65 uint32_t direach_flags;
66 int fsync;
67 } refdb_fs_backend;
68
69 static int refdb_reflog_fs__delete(git_refdb_backend *_backend, const char *name);
70
packref_cmp(const void * a_,const void * b_)71 static int packref_cmp(const void *a_, const void *b_)
72 {
73 const struct packref *a = a_, *b = b_;
74 return strcmp(a->name, b->name);
75 }
76
packed_reload(refdb_fs_backend * backend)77 static int packed_reload(refdb_fs_backend *backend)
78 {
79 int error;
80 git_buf packedrefs = GIT_BUF_INIT;
81 char *scan, *eof, *eol;
82
83 if (!backend->gitpath)
84 return 0;
85
86 error = git_sortedcache_lockandload(backend->refcache, &packedrefs);
87
88 /*
89 * If we can't find the packed-refs, clear table and return.
90 * Any other error just gets passed through.
91 * If no error, and file wasn't changed, just return.
92 * Anything else means we need to refresh the packed refs.
93 */
94 if (error <= 0) {
95 if (error == GIT_ENOTFOUND) {
96 git_sortedcache_clear(backend->refcache, true);
97 git_error_clear();
98 error = 0;
99 }
100 return error;
101 }
102
103 /* At this point, refresh the packed refs from the loaded buffer. */
104
105 git_sortedcache_clear(backend->refcache, false);
106
107 scan = (char *)packedrefs.ptr;
108 eof = scan + packedrefs.size;
109
110 backend->peeling_mode = PEELING_NONE;
111
112 if (*scan == '#') {
113 static const char *traits_header = "# pack-refs with: ";
114
115 if (git__prefixcmp(scan, traits_header) == 0) {
116 scan += strlen(traits_header);
117 eol = strchr(scan, '\n');
118
119 if (!eol)
120 goto parse_failed;
121 *eol = '\0';
122
123 if (strstr(scan, " fully-peeled ") != NULL) {
124 backend->peeling_mode = PEELING_FULL;
125 } else if (strstr(scan, " peeled ") != NULL) {
126 backend->peeling_mode = PEELING_STANDARD;
127 }
128
129 scan = eol + 1;
130 }
131 }
132
133 while (scan < eof && *scan == '#') {
134 if (!(eol = strchr(scan, '\n')))
135 goto parse_failed;
136 scan = eol + 1;
137 }
138
139 while (scan < eof) {
140 struct packref *ref;
141 git_oid oid;
142
143 /* parse "<OID> <refname>\n" */
144
145 if (git_oid_fromstr(&oid, scan) < 0)
146 goto parse_failed;
147 scan += GIT_OID_HEXSZ;
148
149 if (*scan++ != ' ')
150 goto parse_failed;
151 if (!(eol = strchr(scan, '\n')))
152 goto parse_failed;
153 *eol = '\0';
154 if (eol[-1] == '\r')
155 eol[-1] = '\0';
156
157 if (git_sortedcache_upsert((void **)&ref, backend->refcache, scan) < 0)
158 goto parse_failed;
159 scan = eol + 1;
160
161 git_oid_cpy(&ref->oid, &oid);
162
163 /* look for optional "^<OID>\n" */
164
165 if (*scan == '^') {
166 if (git_oid_fromstr(&oid, scan + 1) < 0)
167 goto parse_failed;
168 scan += GIT_OID_HEXSZ + 1;
169
170 if (scan < eof) {
171 if (!(eol = strchr(scan, '\n')))
172 goto parse_failed;
173 scan = eol + 1;
174 }
175
176 git_oid_cpy(&ref->peel, &oid);
177 ref->flags |= PACKREF_HAS_PEEL;
178 }
179 else if (backend->peeling_mode == PEELING_FULL ||
180 (backend->peeling_mode == PEELING_STANDARD &&
181 git__prefixcmp(ref->name, GIT_REFS_TAGS_DIR) == 0))
182 ref->flags |= PACKREF_CANNOT_PEEL;
183 }
184
185 git_sortedcache_wunlock(backend->refcache);
186 git_buf_dispose(&packedrefs);
187
188 return 0;
189
190 parse_failed:
191 git_error_set(GIT_ERROR_REFERENCE, "corrupted packed references file");
192
193 git_sortedcache_clear(backend->refcache, false);
194 git_sortedcache_wunlock(backend->refcache);
195 git_buf_dispose(&packedrefs);
196
197 return -1;
198 }
199
loose_parse_oid(git_oid * oid,const char * filename,git_buf * file_content)200 static int loose_parse_oid(
201 git_oid *oid, const char *filename, git_buf *file_content)
202 {
203 const char *str = git_buf_cstr(file_content);
204
205 if (git_buf_len(file_content) < GIT_OID_HEXSZ)
206 goto corrupted;
207
208 /* we need to get 40 OID characters from the file */
209 if (git_oid_fromstr(oid, str) < 0)
210 goto corrupted;
211
212 /* If the file is longer than 40 chars, the 41st must be a space */
213 str += GIT_OID_HEXSZ;
214 if (*str == '\0' || git__isspace(*str))
215 return 0;
216
217 corrupted:
218 git_error_set(GIT_ERROR_REFERENCE, "corrupted loose reference file: %s", filename);
219 return -1;
220 }
221
loose_readbuffer(git_buf * buf,const char * base,const char * path)222 static int loose_readbuffer(git_buf *buf, const char *base, const char *path)
223 {
224 int error;
225
226 /* build full path to file */
227 if ((error = git_buf_joinpath(buf, base, path)) < 0 ||
228 (error = git_futils_readbuffer(buf, buf->ptr)) < 0)
229 git_buf_dispose(buf);
230
231 return error;
232 }
233
loose_lookup_to_packfile(refdb_fs_backend * backend,const char * name)234 static int loose_lookup_to_packfile(refdb_fs_backend *backend, const char *name)
235 {
236 int error = 0;
237 git_buf ref_file = GIT_BUF_INIT;
238 struct packref *ref = NULL;
239 git_oid oid;
240
241 /* if we fail to load the loose reference, assume someone changed
242 * the filesystem under us and skip it...
243 */
244 if (loose_readbuffer(&ref_file, backend->gitpath, name) < 0) {
245 git_error_clear();
246 goto done;
247 }
248
249 /* skip symbolic refs */
250 if (!git__prefixcmp(git_buf_cstr(&ref_file), GIT_SYMREF))
251 goto done;
252
253 /* parse OID from file */
254 if ((error = loose_parse_oid(&oid, name, &ref_file)) < 0)
255 goto done;
256
257 git_sortedcache_wlock(backend->refcache);
258
259 if (!(error = git_sortedcache_upsert(
260 (void **)&ref, backend->refcache, name))) {
261
262 git_oid_cpy(&ref->oid, &oid);
263 ref->flags = PACKREF_WAS_LOOSE;
264 }
265
266 git_sortedcache_wunlock(backend->refcache);
267
268 done:
269 git_buf_dispose(&ref_file);
270 return error;
271 }
272
_dirent_loose_load(void * payload,git_buf * full_path)273 static int _dirent_loose_load(void *payload, git_buf *full_path)
274 {
275 refdb_fs_backend *backend = payload;
276 const char *file_path;
277
278 if (git__suffixcmp(full_path->ptr, ".lock") == 0)
279 return 0;
280
281 if (git_path_isdir(full_path->ptr)) {
282 int error = git_path_direach(
283 full_path, backend->direach_flags, _dirent_loose_load, backend);
284 /* Race with the filesystem, ignore it */
285 if (error == GIT_ENOTFOUND) {
286 git_error_clear();
287 return 0;
288 }
289
290 return error;
291 }
292
293 file_path = full_path->ptr + strlen(backend->gitpath);
294
295 return loose_lookup_to_packfile(backend, file_path);
296 }
297
298 /*
299 * Load all the loose references from the repository
300 * into the in-memory Packfile, and build a vector with
301 * all the references so it can be written back to
302 * disk.
303 */
packed_loadloose(refdb_fs_backend * backend)304 static int packed_loadloose(refdb_fs_backend *backend)
305 {
306 int error;
307 git_buf refs_path = GIT_BUF_INIT;
308
309 if (git_buf_joinpath(&refs_path, backend->gitpath, GIT_REFS_DIR) < 0)
310 return -1;
311
312 /*
313 * Load all the loose files from disk into the Packfile table.
314 * This will overwrite any old packed entries with their
315 * updated loose versions
316 */
317 error = git_path_direach(
318 &refs_path, backend->direach_flags, _dirent_loose_load, backend);
319
320 git_buf_dispose(&refs_path);
321
322 return error;
323 }
324
refdb_fs_backend__exists(int * exists,git_refdb_backend * _backend,const char * ref_name)325 static int refdb_fs_backend__exists(
326 int *exists,
327 git_refdb_backend *_backend,
328 const char *ref_name)
329 {
330 refdb_fs_backend *backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
331 git_buf ref_path = GIT_BUF_INIT;
332 int error;
333
334 GIT_ASSERT_ARG(backend);
335
336 *exists = 0;
337
338 if ((error = git_buf_joinpath(&ref_path, backend->gitpath, ref_name)) < 0)
339 goto out;
340
341 if (git_path_isfile(ref_path.ptr)) {
342 *exists = 1;
343 goto out;
344 }
345
346 if ((error = packed_reload(backend)) < 0)
347 goto out;
348
349 if (git_sortedcache_lookup(backend->refcache, ref_name) != NULL) {
350 *exists = 1;
351 goto out;
352 }
353
354 out:
355 git_buf_dispose(&ref_path);
356 return error;
357 }
358
loose_parse_symbolic(git_buf * file_content)359 static const char *loose_parse_symbolic(git_buf *file_content)
360 {
361 const unsigned int header_len = (unsigned int)strlen(GIT_SYMREF);
362 const char *refname_start;
363
364 refname_start = (const char *)file_content->ptr;
365
366 if (git_buf_len(file_content) < header_len + 1) {
367 git_error_set(GIT_ERROR_REFERENCE, "corrupted loose reference file");
368 return NULL;
369 }
370
371 /*
372 * Assume we have already checked for the header
373 * before calling this function
374 */
375 refname_start += header_len;
376
377 return refname_start;
378 }
379
380 /*
381 * Returns whether a reference is stored per worktree or not.
382 * Per-worktree references are:
383 *
384 * - all pseudorefs, e.g. HEAD and MERGE_HEAD
385 * - all references stored inside of "refs/bisect/"
386 */
is_per_worktree_ref(const char * ref_name)387 static bool is_per_worktree_ref(const char *ref_name)
388 {
389 return git__prefixcmp(ref_name, "refs/") != 0 ||
390 git__prefixcmp(ref_name, "refs/bisect/") == 0;
391 }
392
loose_lookup(git_reference ** out,refdb_fs_backend * backend,const char * ref_name)393 static int loose_lookup(
394 git_reference **out,
395 refdb_fs_backend *backend,
396 const char *ref_name)
397 {
398 git_buf ref_file = GIT_BUF_INIT;
399 int error = 0;
400 const char *ref_dir;
401
402 if (out)
403 *out = NULL;
404
405 if (is_per_worktree_ref(ref_name))
406 ref_dir = backend->gitpath;
407 else
408 ref_dir = backend->commonpath;
409
410 if ((error = loose_readbuffer(&ref_file, ref_dir, ref_name)) < 0)
411 /* cannot read loose ref file - gah */;
412 else if (git__prefixcmp(git_buf_cstr(&ref_file), GIT_SYMREF) == 0) {
413 const char *target;
414
415 git_buf_rtrim(&ref_file);
416
417 if (!(target = loose_parse_symbolic(&ref_file)))
418 error = -1;
419 else if (out != NULL)
420 *out = git_reference__alloc_symbolic(ref_name, target);
421 } else {
422 git_oid oid;
423
424 if (!(error = loose_parse_oid(&oid, ref_name, &ref_file)) &&
425 out != NULL)
426 *out = git_reference__alloc(ref_name, &oid, NULL);
427 }
428
429 git_buf_dispose(&ref_file);
430 return error;
431 }
432
ref_error_notfound(const char * name)433 static int ref_error_notfound(const char *name)
434 {
435 git_error_set(GIT_ERROR_REFERENCE, "reference '%s' not found", name);
436 return GIT_ENOTFOUND;
437 }
438
packed_lookup(git_reference ** out,refdb_fs_backend * backend,const char * ref_name)439 static int packed_lookup(
440 git_reference **out,
441 refdb_fs_backend *backend,
442 const char *ref_name)
443 {
444 int error = 0;
445 struct packref *entry;
446
447 if ((error = packed_reload(backend)) < 0)
448 return error;
449
450 if (git_sortedcache_rlock(backend->refcache) < 0)
451 return -1;
452
453 entry = git_sortedcache_lookup(backend->refcache, ref_name);
454 if (!entry) {
455 error = ref_error_notfound(ref_name);
456 } else {
457 *out = git_reference__alloc(ref_name, &entry->oid, &entry->peel);
458 if (!*out)
459 error = -1;
460 }
461
462 git_sortedcache_runlock(backend->refcache);
463
464 return error;
465 }
466
refdb_fs_backend__lookup(git_reference ** out,git_refdb_backend * _backend,const char * ref_name)467 static int refdb_fs_backend__lookup(
468 git_reference **out,
469 git_refdb_backend *_backend,
470 const char *ref_name)
471 {
472 refdb_fs_backend *backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
473 int error;
474
475 GIT_ASSERT_ARG(backend);
476
477 if (!(error = loose_lookup(out, backend, ref_name)))
478 return 0;
479
480 /* only try to lookup this reference on the packfile if it
481 * wasn't found on the loose refs; not if there was a critical error */
482 if (error == GIT_ENOTFOUND) {
483 git_error_clear();
484 error = packed_lookup(out, backend, ref_name);
485 }
486
487 return error;
488 }
489
490 typedef struct {
491 git_reference_iterator parent;
492
493 char *glob;
494
495 git_pool pool;
496 git_vector loose;
497
498 git_sortedcache *cache;
499 size_t loose_pos;
500 size_t packed_pos;
501 } refdb_fs_iter;
502
refdb_fs_backend__iterator_free(git_reference_iterator * _iter)503 static void refdb_fs_backend__iterator_free(git_reference_iterator *_iter)
504 {
505 refdb_fs_iter *iter = GIT_CONTAINER_OF(_iter, refdb_fs_iter, parent);
506
507 git_vector_free(&iter->loose);
508 git_pool_clear(&iter->pool);
509 git_sortedcache_free(iter->cache);
510 git__free(iter);
511 }
512
iter_load_loose_paths(refdb_fs_backend * backend,refdb_fs_iter * iter)513 static int iter_load_loose_paths(refdb_fs_backend *backend, refdb_fs_iter *iter)
514 {
515 int error = 0;
516 git_buf path = GIT_BUF_INIT;
517 git_iterator *fsit = NULL;
518 git_iterator_options fsit_opts = GIT_ITERATOR_OPTIONS_INIT;
519 const git_index_entry *entry = NULL;
520 const char *ref_prefix = GIT_REFS_DIR;
521 size_t ref_prefix_len = strlen(ref_prefix);
522
523 if (!backend->commonpath) /* do nothing if no commonpath for loose refs */
524 return 0;
525
526 fsit_opts.flags = backend->iterator_flags;
527
528 if (iter->glob) {
529 const char *last_sep = NULL;
530 const char *pos;
531 for (pos = iter->glob; *pos; ++pos) {
532 switch (*pos) {
533 case '?':
534 case '*':
535 case '[':
536 case '\\':
537 break;
538 case '/':
539 last_sep = pos;
540 /* FALLTHROUGH */
541 default:
542 continue;
543 }
544 break;
545 }
546 if (last_sep) {
547 ref_prefix = iter->glob;
548 ref_prefix_len = (last_sep - ref_prefix) + 1;
549 }
550 }
551
552 if ((error = git_buf_printf(&path, "%s/", backend->commonpath)) < 0 ||
553 (error = git_buf_put(&path, ref_prefix, ref_prefix_len)) < 0) {
554 git_buf_dispose(&path);
555 return error;
556 }
557
558 if ((error = git_iterator_for_filesystem(&fsit, path.ptr, &fsit_opts)) < 0) {
559 git_buf_dispose(&path);
560 return (iter->glob && error == GIT_ENOTFOUND)? 0 : error;
561 }
562
563 error = git_buf_sets(&path, ref_prefix);
564
565 while (!error && !git_iterator_advance(&entry, fsit)) {
566 const char *ref_name;
567 char *ref_dup;
568
569 git_buf_truncate(&path, ref_prefix_len);
570 git_buf_puts(&path, entry->path);
571 ref_name = git_buf_cstr(&path);
572
573 if (git__suffixcmp(ref_name, ".lock") == 0 ||
574 (iter->glob && wildmatch(iter->glob, ref_name, 0) != 0))
575 continue;
576
577 ref_dup = git_pool_strdup(&iter->pool, ref_name);
578 if (!ref_dup)
579 error = -1;
580 else
581 error = git_vector_insert(&iter->loose, ref_dup);
582 }
583
584 git_iterator_free(fsit);
585 git_buf_dispose(&path);
586
587 return error;
588 }
589
refdb_fs_backend__iterator_next(git_reference ** out,git_reference_iterator * _iter)590 static int refdb_fs_backend__iterator_next(
591 git_reference **out, git_reference_iterator *_iter)
592 {
593 int error = GIT_ITEROVER;
594 refdb_fs_iter *iter = GIT_CONTAINER_OF(_iter, refdb_fs_iter, parent);
595 refdb_fs_backend *backend = GIT_CONTAINER_OF(iter->parent.db->backend, refdb_fs_backend, parent);
596 struct packref *ref;
597
598 while (iter->loose_pos < iter->loose.length) {
599 const char *path = git_vector_get(&iter->loose, iter->loose_pos++);
600
601 if (loose_lookup(out, backend, path) == 0) {
602 ref = git_sortedcache_lookup(iter->cache, path);
603 if (ref)
604 ref->flags |= PACKREF_SHADOWED;
605
606 return 0;
607 }
608
609 git_error_clear();
610 }
611
612 error = GIT_ITEROVER;
613 while (iter->packed_pos < git_sortedcache_entrycount(iter->cache)) {
614 ref = git_sortedcache_entry(iter->cache, iter->packed_pos++);
615 if (!ref) /* stop now if another thread deleted refs and we past end */
616 break;
617
618 if (ref->flags & PACKREF_SHADOWED)
619 continue;
620 if (iter->glob && wildmatch(iter->glob, ref->name, 0) != 0)
621 continue;
622
623 *out = git_reference__alloc(ref->name, &ref->oid, &ref->peel);
624 error = (*out != NULL) ? 0 : -1;
625 break;
626 }
627
628 return error;
629 }
630
refdb_fs_backend__iterator_next_name(const char ** out,git_reference_iterator * _iter)631 static int refdb_fs_backend__iterator_next_name(
632 const char **out, git_reference_iterator *_iter)
633 {
634 int error = GIT_ITEROVER;
635 refdb_fs_iter *iter = GIT_CONTAINER_OF(_iter, refdb_fs_iter, parent);
636 refdb_fs_backend *backend = GIT_CONTAINER_OF(iter->parent.db->backend, refdb_fs_backend, parent);
637 struct packref *ref;
638
639 while (iter->loose_pos < iter->loose.length) {
640 const char *path = git_vector_get(&iter->loose, iter->loose_pos++);
641 struct packref *ref;
642
643 if (loose_lookup(NULL, backend, path) == 0) {
644 ref = git_sortedcache_lookup(iter->cache, path);
645 if (ref)
646 ref->flags |= PACKREF_SHADOWED;
647
648 *out = path;
649 return 0;
650 }
651
652 git_error_clear();
653 }
654
655 error = GIT_ITEROVER;
656 while (iter->packed_pos < git_sortedcache_entrycount(iter->cache)) {
657 ref = git_sortedcache_entry(iter->cache, iter->packed_pos++);
658 if (!ref) /* stop now if another thread deleted refs and we past end */
659 break;
660
661 if (ref->flags & PACKREF_SHADOWED)
662 continue;
663 if (iter->glob && wildmatch(iter->glob, ref->name, 0) != 0)
664 continue;
665
666 *out = ref->name;
667 error = 0;
668 break;
669 }
670
671 return error;
672 }
673
refdb_fs_backend__iterator(git_reference_iterator ** out,git_refdb_backend * _backend,const char * glob)674 static int refdb_fs_backend__iterator(
675 git_reference_iterator **out, git_refdb_backend *_backend, const char *glob)
676 {
677 refdb_fs_backend *backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
678 refdb_fs_iter *iter = NULL;
679 int error;
680
681 GIT_ASSERT_ARG(backend);
682
683 iter = git__calloc(1, sizeof(refdb_fs_iter));
684 GIT_ERROR_CHECK_ALLOC(iter);
685
686 if ((error = git_pool_init(&iter->pool, 1)) < 0)
687 goto out;
688
689 if ((error = git_vector_init(&iter->loose, 8, NULL)) < 0)
690 goto out;
691
692 if (glob != NULL &&
693 (iter->glob = git_pool_strdup(&iter->pool, glob)) == NULL) {
694 error = GIT_ERROR_NOMEMORY;
695 goto out;
696 }
697
698 if ((error = iter_load_loose_paths(backend, iter)) < 0)
699 goto out;
700
701 if ((error = packed_reload(backend)) < 0)
702 goto out;
703
704 if ((error = git_sortedcache_copy(&iter->cache, backend->refcache, 1, NULL, NULL)) < 0)
705 goto out;
706
707 iter->parent.next = refdb_fs_backend__iterator_next;
708 iter->parent.next_name = refdb_fs_backend__iterator_next_name;
709 iter->parent.free = refdb_fs_backend__iterator_free;
710
711 *out = (git_reference_iterator *)iter;
712 out:
713 if (error)
714 refdb_fs_backend__iterator_free((git_reference_iterator *)iter);
715 return error;
716 }
717
ref_is_available(const char * old_ref,const char * new_ref,const char * this_ref)718 static bool ref_is_available(
719 const char *old_ref, const char *new_ref, const char *this_ref)
720 {
721 if (old_ref == NULL || strcmp(old_ref, this_ref)) {
722 size_t reflen = strlen(this_ref);
723 size_t newlen = strlen(new_ref);
724 size_t cmplen = reflen < newlen ? reflen : newlen;
725 const char *lead = reflen < newlen ? new_ref : this_ref;
726
727 if (!strncmp(new_ref, this_ref, cmplen) && lead[cmplen] == '/') {
728 return false;
729 }
730 }
731
732 return true;
733 }
734
reference_path_available(refdb_fs_backend * backend,const char * new_ref,const char * old_ref,int force)735 static int reference_path_available(
736 refdb_fs_backend *backend,
737 const char *new_ref,
738 const char* old_ref,
739 int force)
740 {
741 size_t i;
742 int error;
743
744 if ((error = packed_reload(backend)) < 0)
745 return error;
746
747 if (!force) {
748 int exists;
749
750 if ((error = refdb_fs_backend__exists(
751 &exists, (git_refdb_backend *)backend, new_ref)) < 0) {
752 return error;
753 }
754
755 if (exists) {
756 git_error_set(GIT_ERROR_REFERENCE,
757 "failed to write reference '%s': a reference with "
758 "that name already exists.", new_ref);
759 return GIT_EEXISTS;
760 }
761 }
762
763 git_sortedcache_rlock(backend->refcache);
764
765 for (i = 0; i < git_sortedcache_entrycount(backend->refcache); ++i) {
766 struct packref *ref = git_sortedcache_entry(backend->refcache, i);
767
768 if (ref && !ref_is_available(old_ref, new_ref, ref->name)) {
769 git_sortedcache_runlock(backend->refcache);
770 git_error_set(GIT_ERROR_REFERENCE,
771 "path to reference '%s' collides with existing one", new_ref);
772 return -1;
773 }
774 }
775
776 git_sortedcache_runlock(backend->refcache);
777 return 0;
778 }
779
loose_lock(git_filebuf * file,refdb_fs_backend * backend,const char * name)780 static int loose_lock(git_filebuf *file, refdb_fs_backend *backend, const char *name)
781 {
782 int error, filebuf_flags;
783 git_buf ref_path = GIT_BUF_INIT;
784 const char *basedir;
785
786 GIT_ASSERT_ARG(file);
787 GIT_ASSERT_ARG(backend);
788 GIT_ASSERT_ARG(name);
789
790 if (!git_path_isvalid(backend->repo, name, 0, GIT_PATH_REJECT_FILESYSTEM_DEFAULTS)) {
791 git_error_set(GIT_ERROR_INVALID, "invalid reference name '%s'", name);
792 return GIT_EINVALIDSPEC;
793 }
794
795 if (is_per_worktree_ref(name))
796 basedir = backend->gitpath;
797 else
798 basedir = backend->commonpath;
799
800 /* Remove a possibly existing empty directory hierarchy
801 * which name would collide with the reference name
802 */
803 if ((error = git_futils_rmdir_r(name, basedir, GIT_RMDIR_SKIP_NONEMPTY)) < 0)
804 return error;
805
806 if (git_buf_joinpath(&ref_path, basedir, name) < 0)
807 return -1;
808
809 filebuf_flags = GIT_FILEBUF_CREATE_LEADING_DIRS;
810 if (backend->fsync)
811 filebuf_flags |= GIT_FILEBUF_FSYNC;
812
813 error = git_filebuf_open(file, ref_path.ptr, filebuf_flags, GIT_REFS_FILE_MODE);
814
815 if (error == GIT_EDIRECTORY)
816 git_error_set(GIT_ERROR_REFERENCE, "cannot lock ref '%s', there are refs beneath that folder", name);
817
818 git_buf_dispose(&ref_path);
819 return error;
820 }
821
loose_commit(git_filebuf * file,const git_reference * ref)822 static int loose_commit(git_filebuf *file, const git_reference *ref)
823 {
824 GIT_ASSERT_ARG(file);
825 GIT_ASSERT_ARG(ref);
826
827 if (ref->type == GIT_REFERENCE_DIRECT) {
828 char oid[GIT_OID_HEXSZ + 1];
829 git_oid_nfmt(oid, sizeof(oid), &ref->target.oid);
830
831 git_filebuf_printf(file, "%s\n", oid);
832 } else if (ref->type == GIT_REFERENCE_SYMBOLIC) {
833 git_filebuf_printf(file, GIT_SYMREF "%s\n", ref->target.symbolic);
834 } else {
835 GIT_ASSERT(0);
836 }
837
838 return git_filebuf_commit(file);
839 }
840
refdb_fs_backend__lock(void ** out,git_refdb_backend * _backend,const char * refname)841 static int refdb_fs_backend__lock(void **out, git_refdb_backend *_backend, const char *refname)
842 {
843 int error;
844 git_filebuf *lock;
845 refdb_fs_backend *backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
846
847 lock = git__calloc(1, sizeof(git_filebuf));
848 GIT_ERROR_CHECK_ALLOC(lock);
849
850 if ((error = loose_lock(lock, backend, refname)) < 0) {
851 git__free(lock);
852 return error;
853 }
854
855 *out = lock;
856 return 0;
857 }
858
859 static int refdb_fs_backend__write_tail(
860 git_refdb_backend *_backend,
861 const git_reference *ref,
862 git_filebuf *file,
863 int update_reflog,
864 const git_oid *old_id,
865 const char *old_target,
866 const git_signature *who,
867 const char *message);
868
869 static int refdb_fs_backend__delete_tail(
870 git_refdb_backend *_backend,
871 git_filebuf *file,
872 const char *ref_name,
873 const git_oid *old_id,
874 const char *old_target);
875
refdb_fs_backend__unlock(git_refdb_backend * backend,void * payload,int success,int update_reflog,const git_reference * ref,const git_signature * sig,const char * message)876 static int refdb_fs_backend__unlock(git_refdb_backend *backend, void *payload, int success, int update_reflog,
877 const git_reference *ref, const git_signature *sig, const char *message)
878 {
879 git_filebuf *lock = (git_filebuf *) payload;
880 int error = 0;
881
882 if (success == 2)
883 error = refdb_fs_backend__delete_tail(backend, lock, ref->name, NULL, NULL);
884 else if (success)
885 error = refdb_fs_backend__write_tail(backend, ref, lock, update_reflog, NULL, NULL, sig, message);
886 else
887 git_filebuf_cleanup(lock);
888
889 git__free(lock);
890 return error;
891 }
892
893 /*
894 * Find out what object this reference resolves to.
895 *
896 * For references that point to a 'big' tag (e.g. an
897 * actual tag object on the repository), we need to
898 * cache on the packfile the OID of the object to
899 * which that 'big tag' is pointing to.
900 */
packed_find_peel(refdb_fs_backend * backend,struct packref * ref)901 static int packed_find_peel(refdb_fs_backend *backend, struct packref *ref)
902 {
903 git_object *object;
904
905 if (ref->flags & PACKREF_HAS_PEEL || ref->flags & PACKREF_CANNOT_PEEL)
906 return 0;
907
908 /*
909 * Find the tagged object in the repository
910 */
911 if (git_object_lookup(&object, backend->repo, &ref->oid, GIT_OBJECT_ANY) < 0)
912 return -1;
913
914 /*
915 * If the tagged object is a Tag object, we need to resolve it;
916 * if the ref is actually a 'weak' ref, we don't need to resolve
917 * anything.
918 */
919 if (git_object_type(object) == GIT_OBJECT_TAG) {
920 git_tag *tag = (git_tag *)object;
921
922 /*
923 * Find the object pointed at by this tag
924 */
925 git_oid_cpy(&ref->peel, git_tag_target_id(tag));
926 ref->flags |= PACKREF_HAS_PEEL;
927
928 /*
929 * The reference has now cached the resolved OID, and is
930 * marked at such. When written to the packfile, it'll be
931 * accompanied by this resolved oid
932 */
933 }
934
935 git_object_free(object);
936 return 0;
937 }
938
939 /*
940 * Write a single reference into a packfile
941 */
packed_write_ref(struct packref * ref,git_filebuf * file)942 static int packed_write_ref(struct packref *ref, git_filebuf *file)
943 {
944 char oid[GIT_OID_HEXSZ + 1];
945 git_oid_nfmt(oid, sizeof(oid), &ref->oid);
946
947 /*
948 * For references that peel to an object in the repo, we must
949 * write the resulting peel on a separate line, e.g.
950 *
951 * 6fa8a902cc1d18527e1355773c86721945475d37 refs/tags/libgit2-0.4
952 * ^2ec0cb7959b0bf965d54f95453f5b4b34e8d3100
953 *
954 * This obviously only applies to tags.
955 * The required peels have already been loaded into `ref->peel_target`.
956 */
957 if (ref->flags & PACKREF_HAS_PEEL) {
958 char peel[GIT_OID_HEXSZ + 1];
959 git_oid_nfmt(peel, sizeof(peel), &ref->peel);
960
961 if (git_filebuf_printf(file, "%s %s\n^%s\n", oid, ref->name, peel) < 0)
962 return -1;
963 } else {
964 if (git_filebuf_printf(file, "%s %s\n", oid, ref->name) < 0)
965 return -1;
966 }
967
968 return 0;
969 }
970
971 /*
972 * Remove all loose references
973 *
974 * Once we have successfully written a packfile,
975 * all the loose references that were packed must be
976 * removed from disk.
977 *
978 * This is a dangerous method; make sure the packfile
979 * is well-written, because we are destructing references
980 * here otherwise.
981 */
packed_remove_loose(refdb_fs_backend * backend)982 static int packed_remove_loose(refdb_fs_backend *backend)
983 {
984 size_t i;
985 git_filebuf lock = GIT_FILEBUF_INIT;
986 git_buf ref_content = GIT_BUF_INIT;
987 int error = 0;
988
989 /* backend->refcache is already locked when this is called */
990
991 for (i = 0; i < git_sortedcache_entrycount(backend->refcache); ++i) {
992 struct packref *ref = git_sortedcache_entry(backend->refcache, i);
993 git_oid current_id;
994
995 if (!ref || !(ref->flags & PACKREF_WAS_LOOSE))
996 continue;
997
998 git_filebuf_cleanup(&lock);
999
1000 /* We need to stop anybody from updating the ref while we try to do a safe delete */
1001 error = loose_lock(&lock, backend, ref->name);
1002 /* If someone else is updating it, let them do it */
1003 if (error == GIT_EEXISTS || error == GIT_ENOTFOUND)
1004 continue;
1005
1006 if (error < 0) {
1007 git_buf_dispose(&ref_content);
1008 git_error_set(GIT_ERROR_REFERENCE, "failed to lock loose reference '%s'", ref->name);
1009 return error;
1010 }
1011
1012 error = git_futils_readbuffer(&ref_content, lock.path_original);
1013 /* Someone else beat us to cleaning up the ref, let's simply continue */
1014 if (error == GIT_ENOTFOUND)
1015 continue;
1016
1017 /* This became a symref between us packing and trying to delete it, so ignore it */
1018 if (!git__prefixcmp(ref_content.ptr, GIT_SYMREF))
1019 continue;
1020
1021 /* Figure out the current id; if we find a bad ref file, skip it so we can do the rest */
1022 if (loose_parse_oid(¤t_id, lock.path_original, &ref_content) < 0)
1023 continue;
1024
1025 /* If the ref moved since we packed it, we must not delete it */
1026 if (!git_oid_equal(¤t_id, &ref->oid))
1027 continue;
1028
1029 /*
1030 * if we fail to remove a single file, this is *not* good,
1031 * but we should keep going and remove as many as possible.
1032 * If we fail to remove, the ref is still in the old state, so
1033 * we haven't lost information.
1034 */
1035 p_unlink(lock.path_original);
1036 }
1037
1038 git_buf_dispose(&ref_content);
1039 git_filebuf_cleanup(&lock);
1040 return 0;
1041 }
1042
1043 /*
1044 * Write all the contents in the in-memory packfile to disk.
1045 */
packed_write(refdb_fs_backend * backend)1046 static int packed_write(refdb_fs_backend *backend)
1047 {
1048 git_sortedcache *refcache = backend->refcache;
1049 git_filebuf pack_file = GIT_FILEBUF_INIT;
1050 int error, open_flags = 0;
1051 size_t i;
1052
1053 /* lock the cache to updates while we do this */
1054 if ((error = git_sortedcache_wlock(refcache)) < 0)
1055 return error;
1056
1057 if (backend->fsync)
1058 open_flags = GIT_FILEBUF_FSYNC;
1059
1060 /* Open the file! */
1061 if ((error = git_filebuf_open(&pack_file, git_sortedcache_path(refcache), open_flags, GIT_PACKEDREFS_FILE_MODE)) < 0)
1062 goto fail;
1063
1064 /* Packfiles have a header... apparently
1065 * This is in fact not required, but we might as well print it
1066 * just for kicks */
1067 if ((error = git_filebuf_printf(&pack_file, "%s\n", GIT_PACKEDREFS_HEADER)) < 0)
1068 goto fail;
1069
1070 for (i = 0; i < git_sortedcache_entrycount(refcache); ++i) {
1071 struct packref *ref = git_sortedcache_entry(refcache, i);
1072 GIT_ASSERT(ref);
1073
1074 if ((error = packed_find_peel(backend, ref)) < 0)
1075 goto fail;
1076
1077 if ((error = packed_write_ref(ref, &pack_file)) < 0)
1078 goto fail;
1079 }
1080
1081 /* if we've written all the references properly, we can commit
1082 * the packfile to make the changes effective */
1083 if ((error = git_filebuf_commit(&pack_file)) < 0)
1084 goto fail;
1085
1086 /* when and only when the packfile has been properly written,
1087 * we can go ahead and remove the loose refs */
1088 if ((error = packed_remove_loose(backend)) < 0)
1089 goto fail;
1090
1091 git_sortedcache_updated(refcache);
1092 git_sortedcache_wunlock(refcache);
1093
1094 /* we're good now */
1095 return 0;
1096
1097 fail:
1098 git_filebuf_cleanup(&pack_file);
1099 git_sortedcache_wunlock(refcache);
1100
1101 return error;
1102 }
1103
packed_delete(refdb_fs_backend * backend,const char * ref_name)1104 static int packed_delete(refdb_fs_backend *backend, const char *ref_name)
1105 {
1106 size_t pack_pos;
1107 int error, found = 0;
1108
1109 if ((error = packed_reload(backend)) < 0)
1110 goto cleanup;
1111
1112 if ((error = git_sortedcache_wlock(backend->refcache)) < 0)
1113 goto cleanup;
1114
1115 /* If a packed reference exists, remove it from the packfile and repack if necessary */
1116 error = git_sortedcache_lookup_index(&pack_pos, backend->refcache, ref_name);
1117 if (error == 0) {
1118 error = git_sortedcache_remove(backend->refcache, pack_pos);
1119 found = 1;
1120 }
1121 if (error == GIT_ENOTFOUND)
1122 error = 0;
1123
1124 git_sortedcache_wunlock(backend->refcache);
1125
1126 if (found)
1127 error = packed_write(backend);
1128
1129 cleanup:
1130 return error;
1131 }
1132
1133 static int reflog_append(refdb_fs_backend *backend, const git_reference *ref, const git_oid *old, const git_oid *new, const git_signature *author, const char *message);
1134
cmp_old_ref(int * cmp,git_refdb_backend * backend,const char * name,const git_oid * old_id,const char * old_target)1135 static int cmp_old_ref(int *cmp, git_refdb_backend *backend, const char *name,
1136 const git_oid *old_id, const char *old_target)
1137 {
1138 int error = 0;
1139 git_reference *old_ref = NULL;
1140
1141 *cmp = 0;
1142 /* It "matches" if there is no old value to compare against */
1143 if (!old_id && !old_target)
1144 return 0;
1145
1146 if ((error = refdb_fs_backend__lookup(&old_ref, backend, name)) < 0)
1147 goto out;
1148
1149 /* If the types don't match, there's no way the values do */
1150 if (old_id && old_ref->type != GIT_REFERENCE_DIRECT) {
1151 *cmp = -1;
1152 goto out;
1153 }
1154 if (old_target && old_ref->type != GIT_REFERENCE_SYMBOLIC) {
1155 *cmp = 1;
1156 goto out;
1157 }
1158
1159 if (old_id && old_ref->type == GIT_REFERENCE_DIRECT)
1160 *cmp = git_oid_cmp(old_id, &old_ref->target.oid);
1161
1162 if (old_target && old_ref->type == GIT_REFERENCE_SYMBOLIC)
1163 *cmp = git__strcmp(old_target, old_ref->target.symbolic);
1164
1165 out:
1166 git_reference_free(old_ref);
1167
1168 return error;
1169 }
1170
1171 /*
1172 * The git.git comment regarding this, for your viewing pleasure:
1173 *
1174 * Special hack: If a branch is updated directly and HEAD
1175 * points to it (may happen on the remote side of a push
1176 * for example) then logically the HEAD reflog should be
1177 * updated too.
1178 * A generic solution implies reverse symref information,
1179 * but finding all symrefs pointing to the given branch
1180 * would be rather costly for this rare event (the direct
1181 * update of a branch) to be worth it. So let's cheat and
1182 * check with HEAD only which should cover 99% of all usage
1183 * scenarios (even 100% of the default ones).
1184 */
maybe_append_head(refdb_fs_backend * backend,const git_reference * ref,const git_signature * who,const char * message)1185 static int maybe_append_head(refdb_fs_backend *backend, const git_reference *ref, const git_signature *who, const char *message)
1186 {
1187 git_reference *head = NULL;
1188 git_refdb *refdb = NULL;
1189 int error, write_reflog;
1190 git_oid old_id;
1191
1192 if ((error = git_repository_refdb(&refdb, backend->repo)) < 0 ||
1193 (error = git_refdb_should_write_head_reflog(&write_reflog, refdb, ref)) < 0)
1194 goto out;
1195 if (!write_reflog)
1196 goto out;
1197
1198 /* if we can't resolve, we use {0}*40 as old id */
1199 if (git_reference_name_to_id(&old_id, backend->repo, ref->name) < 0)
1200 memset(&old_id, 0, sizeof(old_id));
1201
1202 if ((error = git_reference_lookup(&head, backend->repo, GIT_HEAD_FILE)) < 0 ||
1203 (error = reflog_append(backend, head, &old_id, git_reference_target(ref), who, message)) < 0)
1204 goto out;
1205
1206 out:
1207 git_reference_free(head);
1208 git_refdb_free(refdb);
1209 return error;
1210 }
1211
refdb_fs_backend__write(git_refdb_backend * _backend,const git_reference * ref,int force,const git_signature * who,const char * message,const git_oid * old_id,const char * old_target)1212 static int refdb_fs_backend__write(
1213 git_refdb_backend *_backend,
1214 const git_reference *ref,
1215 int force,
1216 const git_signature *who,
1217 const char *message,
1218 const git_oid *old_id,
1219 const char *old_target)
1220 {
1221 refdb_fs_backend *backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
1222 git_filebuf file = GIT_FILEBUF_INIT;
1223 int error = 0;
1224
1225 GIT_ASSERT_ARG(backend);
1226
1227 if ((error = reference_path_available(backend, ref->name, NULL, force)) < 0)
1228 return error;
1229
1230 /* We need to perform the reflog append and old value check under the ref's lock */
1231 if ((error = loose_lock(&file, backend, ref->name)) < 0)
1232 return error;
1233
1234 return refdb_fs_backend__write_tail(_backend, ref, &file, true, old_id, old_target, who, message);
1235 }
1236
refdb_fs_backend__write_tail(git_refdb_backend * _backend,const git_reference * ref,git_filebuf * file,int update_reflog,const git_oid * old_id,const char * old_target,const git_signature * who,const char * message)1237 static int refdb_fs_backend__write_tail(
1238 git_refdb_backend *_backend,
1239 const git_reference *ref,
1240 git_filebuf *file,
1241 int update_reflog,
1242 const git_oid *old_id,
1243 const char *old_target,
1244 const git_signature *who,
1245 const char *message)
1246 {
1247 refdb_fs_backend *backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
1248 int error = 0, cmp = 0, should_write;
1249 const char *new_target = NULL;
1250 const git_oid *new_id = NULL;
1251
1252 if ((error = cmp_old_ref(&cmp, _backend, ref->name, old_id, old_target)) < 0)
1253 goto on_error;
1254
1255 if (cmp) {
1256 git_error_set(GIT_ERROR_REFERENCE, "old reference value does not match");
1257 error = GIT_EMODIFIED;
1258 goto on_error;
1259 }
1260
1261 if (ref->type == GIT_REFERENCE_SYMBOLIC)
1262 new_target = ref->target.symbolic;
1263 else
1264 new_id = &ref->target.oid;
1265
1266 error = cmp_old_ref(&cmp, _backend, ref->name, new_id, new_target);
1267 if (error < 0 && error != GIT_ENOTFOUND)
1268 goto on_error;
1269
1270 /* Don't update if we have the same value */
1271 if (!error && !cmp) {
1272 error = 0;
1273 goto on_error; /* not really error */
1274 }
1275
1276 if (update_reflog) {
1277 git_refdb *refdb;
1278
1279 if ((error = git_repository_refdb__weakptr(&refdb, backend->repo)) < 0 ||
1280 (error = git_refdb_should_write_reflog(&should_write, refdb, ref)) < 0)
1281 goto on_error;
1282
1283 if (should_write) {
1284 if ((error = reflog_append(backend, ref, NULL, NULL, who, message)) < 0)
1285 goto on_error;
1286 if ((error = maybe_append_head(backend, ref, who, message)) < 0)
1287 goto on_error;
1288 }
1289 }
1290
1291 return loose_commit(file, ref);
1292
1293 on_error:
1294 git_filebuf_cleanup(file);
1295 return error;
1296 }
1297
refdb_fs_backend__prune_refs(refdb_fs_backend * backend,const char * ref_name,const char * prefix)1298 static int refdb_fs_backend__prune_refs(
1299 refdb_fs_backend *backend,
1300 const char *ref_name,
1301 const char *prefix)
1302 {
1303 git_buf relative_path = GIT_BUF_INIT;
1304 git_buf base_path = GIT_BUF_INIT;
1305 size_t commonlen;
1306 int error;
1307
1308 GIT_ASSERT_ARG(backend);
1309 GIT_ASSERT_ARG(ref_name);
1310
1311 if ((error = git_buf_sets(&relative_path, ref_name)) < 0)
1312 goto cleanup;
1313
1314 git_path_squash_slashes(&relative_path);
1315 if ((commonlen = git_path_common_dirlen("refs/heads/", git_buf_cstr(&relative_path))) == strlen("refs/heads/") ||
1316 (commonlen = git_path_common_dirlen("refs/tags/", git_buf_cstr(&relative_path))) == strlen("refs/tags/") ||
1317 (commonlen = git_path_common_dirlen("refs/remotes/", git_buf_cstr(&relative_path))) == strlen("refs/remotes/")) {
1318
1319 git_buf_truncate(&relative_path, commonlen);
1320
1321 if (prefix)
1322 error = git_buf_join3(&base_path, '/',
1323 backend->commonpath, prefix,
1324 git_buf_cstr(&relative_path));
1325 else
1326 error = git_buf_joinpath(&base_path,
1327 backend->commonpath,
1328 git_buf_cstr(&relative_path));
1329
1330 if (error < 0)
1331 goto cleanup;
1332
1333 error = git_futils_rmdir_r(ref_name + commonlen,
1334 git_buf_cstr(&base_path),
1335 GIT_RMDIR_EMPTY_PARENTS | GIT_RMDIR_SKIP_ROOT);
1336
1337 if (error == GIT_ENOTFOUND)
1338 error = 0;
1339 }
1340
1341 cleanup:
1342 git_buf_dispose(&relative_path);
1343 git_buf_dispose(&base_path);
1344 return error;
1345 }
1346
refdb_fs_backend__delete(git_refdb_backend * _backend,const char * ref_name,const git_oid * old_id,const char * old_target)1347 static int refdb_fs_backend__delete(
1348 git_refdb_backend *_backend,
1349 const char *ref_name,
1350 const git_oid *old_id, const char *old_target)
1351 {
1352 refdb_fs_backend *backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
1353 git_filebuf file = GIT_FILEBUF_INIT;
1354 int error = 0;
1355
1356 GIT_ASSERT_ARG(backend);
1357 GIT_ASSERT_ARG(ref_name);
1358
1359 if ((error = loose_lock(&file, backend, ref_name)) < 0)
1360 return error;
1361
1362 if ((error = refdb_reflog_fs__delete(_backend, ref_name)) < 0) {
1363 git_filebuf_cleanup(&file);
1364 return error;
1365 }
1366
1367 return refdb_fs_backend__delete_tail(_backend, &file, ref_name, old_id, old_target);
1368 }
1369
loose_delete(refdb_fs_backend * backend,const char * ref_name)1370 static int loose_delete(refdb_fs_backend *backend, const char *ref_name)
1371 {
1372 git_buf loose_path = GIT_BUF_INIT;
1373 int error = 0;
1374
1375 if (git_buf_joinpath(&loose_path, backend->commonpath, ref_name) < 0)
1376 return -1;
1377
1378 error = p_unlink(loose_path.ptr);
1379 if (error < 0 && errno == ENOENT)
1380 error = GIT_ENOTFOUND;
1381 else if (error != 0)
1382 error = -1;
1383
1384 git_buf_dispose(&loose_path);
1385
1386 return error;
1387 }
1388
refdb_fs_backend__delete_tail(git_refdb_backend * _backend,git_filebuf * file,const char * ref_name,const git_oid * old_id,const char * old_target)1389 static int refdb_fs_backend__delete_tail(
1390 git_refdb_backend *_backend,
1391 git_filebuf *file,
1392 const char *ref_name,
1393 const git_oid *old_id, const char *old_target)
1394 {
1395 refdb_fs_backend *backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
1396 int error = 0, cmp = 0;
1397 bool packed_deleted = 0;
1398
1399 error = cmp_old_ref(&cmp, _backend, ref_name, old_id, old_target);
1400 if (error < 0)
1401 goto cleanup;
1402
1403 if (cmp) {
1404 git_error_set(GIT_ERROR_REFERENCE, "old reference value does not match");
1405 error = GIT_EMODIFIED;
1406 goto cleanup;
1407 }
1408
1409 /*
1410 * To ensure that an external observer will see either the current ref value
1411 * (because the loose ref still exists), or a missing ref (after the packed-file is
1412 * unlocked, there will be nothing left), we must ensure things happen in the
1413 * following order:
1414 *
1415 * - the packed-ref file is locked and loaded, as well as a loose one, if it exists
1416 * - we optimistically delete a packed ref, keeping track of whether it existed
1417 * - we delete the loose ref, note that we have its .lock
1418 * - the loose ref is "unlocked", then the packed-ref file is rewritten and unlocked
1419 * - we should prune the path components if a loose ref was deleted
1420 *
1421 * Note that, because our packed backend doesn't expose its filesystem lock,
1422 * we might not be able to guarantee that this is what actually happens (ie.
1423 * as our current code never write packed-refs.lock, nothing stops observers
1424 * from grabbing a "stale" value from there).
1425 */
1426 if ((error = packed_delete(backend, ref_name)) < 0 && error != GIT_ENOTFOUND)
1427 goto cleanup;
1428
1429 if (error == 0)
1430 packed_deleted = 1;
1431
1432 if ((error = loose_delete(backend, ref_name)) < 0 && error != GIT_ENOTFOUND)
1433 goto cleanup;
1434
1435 if (error == GIT_ENOTFOUND) {
1436 error = packed_deleted ? 0 : ref_error_notfound(ref_name);
1437 goto cleanup;
1438 }
1439
1440 cleanup:
1441 git_filebuf_cleanup(file);
1442 if (error == 0)
1443 error = refdb_fs_backend__prune_refs(backend, ref_name, "");
1444 return error;
1445 }
1446
1447 static int refdb_reflog_fs__rename(git_refdb_backend *_backend, const char *old_name, const char *new_name);
1448
refdb_fs_backend__rename(git_reference ** out,git_refdb_backend * _backend,const char * old_name,const char * new_name,int force,const git_signature * who,const char * message)1449 static int refdb_fs_backend__rename(
1450 git_reference **out,
1451 git_refdb_backend *_backend,
1452 const char *old_name,
1453 const char *new_name,
1454 int force,
1455 const git_signature *who,
1456 const char *message)
1457 {
1458 refdb_fs_backend *backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
1459 git_reference *old, *new = NULL;
1460 git_filebuf file = GIT_FILEBUF_INIT;
1461 int error;
1462
1463 GIT_ASSERT_ARG(backend);
1464
1465 if ((error = reference_path_available(
1466 backend, new_name, old_name, force)) < 0 ||
1467 (error = refdb_fs_backend__lookup(&old, _backend, old_name)) < 0)
1468 return error;
1469
1470 if ((error = refdb_fs_backend__delete(_backend, old_name, NULL, NULL)) < 0) {
1471 git_reference_free(old);
1472 return error;
1473 }
1474
1475 new = git_reference__realloc(&old, new_name);
1476 if (!new) {
1477 git_reference_free(old);
1478 return -1;
1479 }
1480
1481 if ((error = loose_lock(&file, backend, new->name)) < 0) {
1482 git_reference_free(new);
1483 return error;
1484 }
1485
1486 /* Try to rename the refog; it's ok if the old doesn't exist */
1487 error = refdb_reflog_fs__rename(_backend, old_name, new_name);
1488 if (((error == 0) || (error == GIT_ENOTFOUND)) &&
1489 ((error = reflog_append(backend, new, git_reference_target(new), NULL, who, message)) < 0)) {
1490 git_reference_free(new);
1491 git_filebuf_cleanup(&file);
1492 return error;
1493 }
1494
1495 if (error < 0) {
1496 git_reference_free(new);
1497 git_filebuf_cleanup(&file);
1498 return error;
1499 }
1500
1501
1502 if ((error = loose_commit(&file, new)) < 0 || out == NULL) {
1503 git_reference_free(new);
1504 return error;
1505 }
1506
1507 *out = new;
1508 return 0;
1509 }
1510
refdb_fs_backend__compress(git_refdb_backend * _backend)1511 static int refdb_fs_backend__compress(git_refdb_backend *_backend)
1512 {
1513 int error;
1514 refdb_fs_backend *backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
1515
1516 GIT_ASSERT_ARG(backend);
1517
1518 if ((error = packed_reload(backend)) < 0 || /* load the existing packfile */
1519 (error = packed_loadloose(backend)) < 0 || /* add all the loose refs */
1520 (error = packed_write(backend)) < 0) /* write back to disk */
1521 return error;
1522
1523 return 0;
1524 }
1525
refdb_fs_backend__free(git_refdb_backend * _backend)1526 static void refdb_fs_backend__free(git_refdb_backend *_backend)
1527 {
1528 refdb_fs_backend *backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
1529
1530 if (!backend)
1531 return;
1532
1533 git_sortedcache_free(backend->refcache);
1534 git__free(backend->gitpath);
1535 git__free(backend->commonpath);
1536 git__free(backend);
1537 }
1538
setup_namespace(git_repository * repo,const char * in)1539 static char *setup_namespace(git_repository *repo, const char *in)
1540 {
1541 git_buf path = GIT_BUF_INIT;
1542 char *parts, *start, *end, *out = NULL;
1543
1544 if (!in)
1545 goto done;
1546
1547 git_buf_puts(&path, in);
1548
1549 /* if the repo is not namespaced, nothing else to do */
1550 if (repo->namespace == NULL) {
1551 out = git_buf_detach(&path);
1552 goto done;
1553 }
1554
1555 parts = end = git__strdup(repo->namespace);
1556 if (parts == NULL)
1557 goto done;
1558
1559 /*
1560 * From `man gitnamespaces`:
1561 * namespaces which include a / will expand to a hierarchy
1562 * of namespaces; for example, GIT_NAMESPACE=foo/bar will store
1563 * refs under refs/namespaces/foo/refs/namespaces/bar/
1564 */
1565 while ((start = git__strsep(&end, "/")) != NULL)
1566 git_buf_printf(&path, "refs/namespaces/%s/", start);
1567
1568 git_buf_printf(&path, "refs/namespaces/%s/refs", end);
1569 git__free(parts);
1570
1571 /* Make sure that the folder with the namespace exists */
1572 if (git_futils_mkdir_relative(git_buf_cstr(&path), in, 0777,
1573 GIT_MKDIR_PATH, NULL) < 0)
1574 goto done;
1575
1576 /* Return root of the namespaced gitpath, i.e. without the trailing '/refs' */
1577 git_buf_rtruncate_at_char(&path, '/');
1578 out = git_buf_detach(&path);
1579
1580 done:
1581 git_buf_dispose(&path);
1582 return out;
1583 }
1584
reflog_alloc(git_reflog ** reflog,const char * name)1585 static int reflog_alloc(git_reflog **reflog, const char *name)
1586 {
1587 git_reflog *log;
1588
1589 *reflog = NULL;
1590
1591 log = git__calloc(1, sizeof(git_reflog));
1592 GIT_ERROR_CHECK_ALLOC(log);
1593
1594 log->ref_name = git__strdup(name);
1595 GIT_ERROR_CHECK_ALLOC(log->ref_name);
1596
1597 if (git_vector_init(&log->entries, 0, NULL) < 0) {
1598 git__free(log->ref_name);
1599 git__free(log);
1600 return -1;
1601 }
1602
1603 *reflog = log;
1604
1605 return 0;
1606 }
1607
reflog_parse(git_reflog * log,const char * buf,size_t buf_size)1608 static int reflog_parse(git_reflog *log, const char *buf, size_t buf_size)
1609 {
1610 git_parse_ctx parser = GIT_PARSE_CTX_INIT;
1611
1612 if ((git_parse_ctx_init(&parser, buf, buf_size)) < 0)
1613 return -1;
1614
1615 for (; parser.remain_len; git_parse_advance_line(&parser)) {
1616 git_reflog_entry *entry;
1617 const char *sig;
1618 char c;
1619
1620 entry = git__calloc(1, sizeof(*entry));
1621 GIT_ERROR_CHECK_ALLOC(entry);
1622 entry->committer = git__calloc(1, sizeof(*entry->committer));
1623 GIT_ERROR_CHECK_ALLOC(entry->committer);
1624
1625 if (git_parse_advance_oid(&entry->oid_old, &parser) < 0 ||
1626 git_parse_advance_expected(&parser, " ", 1) < 0 ||
1627 git_parse_advance_oid(&entry->oid_cur, &parser) < 0)
1628 goto next;
1629
1630 sig = parser.line;
1631 while (git_parse_peek(&c, &parser, 0) == 0 && c != '\t' && c != '\n')
1632 git_parse_advance_chars(&parser, 1);
1633
1634 if (git_signature__parse(entry->committer, &sig, parser.line, NULL, 0) < 0)
1635 goto next;
1636
1637 if (c == '\t') {
1638 size_t len;
1639 git_parse_advance_chars(&parser, 1);
1640
1641 len = parser.line_len;
1642 if (parser.line[len - 1] == '\n')
1643 len--;
1644
1645 entry->msg = git__strndup(parser.line, len);
1646 GIT_ERROR_CHECK_ALLOC(entry->msg);
1647 }
1648
1649 if ((git_vector_insert(&log->entries, entry)) < 0) {
1650 git_reflog_entry__free(entry);
1651 return -1;
1652 }
1653
1654 continue;
1655
1656 next:
1657 git_reflog_entry__free(entry);
1658 }
1659
1660 return 0;
1661 }
1662
create_new_reflog_file(const char * filepath)1663 static int create_new_reflog_file(const char *filepath)
1664 {
1665 int fd, error;
1666
1667 if ((error = git_futils_mkpath2file(filepath, GIT_REFLOG_DIR_MODE)) < 0)
1668 return error;
1669
1670 if ((fd = p_open(filepath,
1671 O_WRONLY | O_CREAT,
1672 GIT_REFLOG_FILE_MODE)) < 0)
1673 return -1;
1674
1675 return p_close(fd);
1676 }
1677
retrieve_reflog_path(git_buf * path,git_repository * repo,const char * name)1678 GIT_INLINE(int) retrieve_reflog_path(git_buf *path, git_repository *repo, const char *name)
1679 {
1680 if (strcmp(name, GIT_HEAD_FILE) == 0)
1681 return git_buf_join3(path, '/', repo->gitdir, GIT_REFLOG_DIR, name);
1682 return git_buf_join3(path, '/', repo->commondir, GIT_REFLOG_DIR, name);
1683 }
1684
refdb_reflog_fs__ensure_log(git_refdb_backend * _backend,const char * name)1685 static int refdb_reflog_fs__ensure_log(git_refdb_backend *_backend, const char *name)
1686 {
1687 refdb_fs_backend *backend;
1688 git_repository *repo;
1689 git_buf path = GIT_BUF_INIT;
1690 int error;
1691
1692 GIT_ASSERT_ARG(_backend && name);
1693
1694 backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
1695 repo = backend->repo;
1696
1697 if ((error = retrieve_reflog_path(&path, repo, name)) < 0)
1698 return error;
1699
1700 error = create_new_reflog_file(git_buf_cstr(&path));
1701 git_buf_dispose(&path);
1702
1703 return error;
1704 }
1705
has_reflog(git_repository * repo,const char * name)1706 static int has_reflog(git_repository *repo, const char *name)
1707 {
1708 int ret = 0;
1709 git_buf path = GIT_BUF_INIT;
1710
1711 if (retrieve_reflog_path(&path, repo, name) < 0)
1712 goto cleanup;
1713
1714 ret = git_path_isfile(git_buf_cstr(&path));
1715
1716 cleanup:
1717 git_buf_dispose(&path);
1718 return ret;
1719 }
1720
refdb_reflog_fs__has_log(git_refdb_backend * _backend,const char * name)1721 static int refdb_reflog_fs__has_log(git_refdb_backend *_backend, const char *name)
1722 {
1723 refdb_fs_backend *backend;
1724
1725 GIT_ASSERT_ARG(_backend);
1726 GIT_ASSERT_ARG(name);
1727
1728 backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
1729
1730 return has_reflog(backend->repo, name);
1731 }
1732
refdb_reflog_fs__read(git_reflog ** out,git_refdb_backend * _backend,const char * name)1733 static int refdb_reflog_fs__read(git_reflog **out, git_refdb_backend *_backend, const char *name)
1734 {
1735 int error = -1;
1736 git_buf log_path = GIT_BUF_INIT;
1737 git_buf log_file = GIT_BUF_INIT;
1738 git_reflog *log = NULL;
1739 git_repository *repo;
1740 refdb_fs_backend *backend;
1741
1742 GIT_ASSERT_ARG(out);
1743 GIT_ASSERT_ARG(_backend);
1744 GIT_ASSERT_ARG(name);
1745
1746 backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
1747 repo = backend->repo;
1748
1749 if (reflog_alloc(&log, name) < 0)
1750 return -1;
1751
1752 if (retrieve_reflog_path(&log_path, repo, name) < 0)
1753 goto cleanup;
1754
1755 error = git_futils_readbuffer(&log_file, git_buf_cstr(&log_path));
1756 if (error < 0 && error != GIT_ENOTFOUND)
1757 goto cleanup;
1758
1759 if ((error == GIT_ENOTFOUND) &&
1760 ((error = create_new_reflog_file(git_buf_cstr(&log_path))) < 0))
1761 goto cleanup;
1762
1763 if ((error = reflog_parse(log,
1764 git_buf_cstr(&log_file), git_buf_len(&log_file))) < 0)
1765 goto cleanup;
1766
1767 *out = log;
1768 goto success;
1769
1770 cleanup:
1771 git_reflog_free(log);
1772
1773 success:
1774 git_buf_dispose(&log_file);
1775 git_buf_dispose(&log_path);
1776
1777 return error;
1778 }
1779
serialize_reflog_entry(git_buf * buf,const git_oid * oid_old,const git_oid * oid_new,const git_signature * committer,const char * msg)1780 static int serialize_reflog_entry(
1781 git_buf *buf,
1782 const git_oid *oid_old,
1783 const git_oid *oid_new,
1784 const git_signature *committer,
1785 const char *msg)
1786 {
1787 char raw_old[GIT_OID_HEXSZ+1];
1788 char raw_new[GIT_OID_HEXSZ+1];
1789
1790 git_oid_tostr(raw_old, GIT_OID_HEXSZ+1, oid_old);
1791 git_oid_tostr(raw_new, GIT_OID_HEXSZ+1, oid_new);
1792
1793 git_buf_clear(buf);
1794
1795 git_buf_puts(buf, raw_old);
1796 git_buf_putc(buf, ' ');
1797 git_buf_puts(buf, raw_new);
1798
1799 git_signature__writebuf(buf, " ", committer);
1800
1801 /* drop trailing LF */
1802 git_buf_rtrim(buf);
1803
1804 if (msg) {
1805 size_t i;
1806
1807 git_buf_putc(buf, '\t');
1808 git_buf_puts(buf, msg);
1809
1810 for (i = 0; i < buf->size - 2; i++)
1811 if (buf->ptr[i] == '\n')
1812 buf->ptr[i] = ' ';
1813 git_buf_rtrim(buf);
1814 }
1815
1816 git_buf_putc(buf, '\n');
1817
1818 return git_buf_oom(buf);
1819 }
1820
lock_reflog(git_filebuf * file,refdb_fs_backend * backend,const char * refname)1821 static int lock_reflog(git_filebuf *file, refdb_fs_backend *backend, const char *refname)
1822 {
1823 git_repository *repo;
1824 git_buf log_path = GIT_BUF_INIT;
1825 int error;
1826
1827 repo = backend->repo;
1828
1829 if (!git_path_isvalid(backend->repo, refname, 0, GIT_PATH_REJECT_FILESYSTEM_DEFAULTS)) {
1830 git_error_set(GIT_ERROR_INVALID, "invalid reference name '%s'", refname);
1831 return GIT_EINVALIDSPEC;
1832 }
1833
1834 if (retrieve_reflog_path(&log_path, repo, refname) < 0)
1835 return -1;
1836
1837 if (!git_path_isfile(git_buf_cstr(&log_path))) {
1838 git_error_set(GIT_ERROR_INVALID,
1839 "log file for reference '%s' doesn't exist", refname);
1840 error = -1;
1841 goto cleanup;
1842 }
1843
1844 error = git_filebuf_open(file, git_buf_cstr(&log_path), 0, GIT_REFLOG_FILE_MODE);
1845
1846 cleanup:
1847 git_buf_dispose(&log_path);
1848
1849 return error;
1850 }
1851
refdb_reflog_fs__write(git_refdb_backend * _backend,git_reflog * reflog)1852 static int refdb_reflog_fs__write(git_refdb_backend *_backend, git_reflog *reflog)
1853 {
1854 int error = -1;
1855 unsigned int i;
1856 git_reflog_entry *entry;
1857 refdb_fs_backend *backend;
1858 git_buf log = GIT_BUF_INIT;
1859 git_filebuf fbuf = GIT_FILEBUF_INIT;
1860
1861 GIT_ASSERT_ARG(_backend);
1862 GIT_ASSERT_ARG(reflog);
1863
1864 backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
1865
1866 if ((error = lock_reflog(&fbuf, backend, reflog->ref_name)) < 0)
1867 return -1;
1868
1869 git_vector_foreach(&reflog->entries, i, entry) {
1870 if (serialize_reflog_entry(&log, &(entry->oid_old), &(entry->oid_cur), entry->committer, entry->msg) < 0)
1871 goto cleanup;
1872
1873 if ((error = git_filebuf_write(&fbuf, log.ptr, log.size)) < 0)
1874 goto cleanup;
1875 }
1876
1877 error = git_filebuf_commit(&fbuf);
1878 goto success;
1879
1880 cleanup:
1881 git_filebuf_cleanup(&fbuf);
1882
1883 success:
1884 git_buf_dispose(&log);
1885
1886 return error;
1887 }
1888
1889 /* Append to the reflog, must be called under reference lock */
reflog_append(refdb_fs_backend * backend,const git_reference * ref,const git_oid * old,const git_oid * new,const git_signature * who,const char * message)1890 static int reflog_append(refdb_fs_backend *backend, const git_reference *ref, const git_oid *old, const git_oid *new, const git_signature *who, const char *message)
1891 {
1892 int error, is_symbolic, open_flags;
1893 git_oid old_id = {{0}}, new_id = {{0}};
1894 git_buf buf = GIT_BUF_INIT, path = GIT_BUF_INIT;
1895 git_repository *repo = backend->repo;
1896
1897 is_symbolic = ref->type == GIT_REFERENCE_SYMBOLIC;
1898
1899 /* "normal" symbolic updates do not write */
1900 if (is_symbolic &&
1901 strcmp(ref->name, GIT_HEAD_FILE) &&
1902 !(old && new))
1903 return 0;
1904
1905 /* From here on is_symbolic also means that it's HEAD */
1906
1907 if (old) {
1908 git_oid_cpy(&old_id, old);
1909 } else {
1910 error = git_reference_name_to_id(&old_id, repo, ref->name);
1911 if (error < 0 && error != GIT_ENOTFOUND)
1912 return error;
1913 }
1914
1915 if (new) {
1916 git_oid_cpy(&new_id, new);
1917 } else {
1918 if (!is_symbolic) {
1919 git_oid_cpy(&new_id, git_reference_target(ref));
1920 } else {
1921 error = git_reference_name_to_id(&new_id, repo, git_reference_symbolic_target(ref));
1922 if (error < 0 && error != GIT_ENOTFOUND)
1923 return error;
1924 /* detaching HEAD does not create an entry */
1925 if (error == GIT_ENOTFOUND)
1926 return 0;
1927
1928 git_error_clear();
1929 }
1930 }
1931
1932 if ((error = serialize_reflog_entry(&buf, &old_id, &new_id, who, message)) < 0)
1933 goto cleanup;
1934
1935 if ((error = retrieve_reflog_path(&path, repo, ref->name)) < 0)
1936 goto cleanup;
1937
1938 if (((error = git_futils_mkpath2file(git_buf_cstr(&path), 0777)) < 0) &&
1939 (error != GIT_EEXISTS)) {
1940 goto cleanup;
1941 }
1942
1943 /* If the new branch matches part of the namespace of a previously deleted branch,
1944 * there maybe an obsolete/unused directory (or directory hierarchy) in the way.
1945 */
1946 if (git_path_isdir(git_buf_cstr(&path))) {
1947 if ((error = git_futils_rmdir_r(git_buf_cstr(&path), NULL, GIT_RMDIR_SKIP_NONEMPTY)) < 0) {
1948 if (error == GIT_ENOTFOUND)
1949 error = 0;
1950 } else if (git_path_isdir(git_buf_cstr(&path))) {
1951 git_error_set(GIT_ERROR_REFERENCE, "cannot create reflog at '%s', there are reflogs beneath that folder",
1952 ref->name);
1953 error = GIT_EDIRECTORY;
1954 }
1955
1956 if (error != 0)
1957 goto cleanup;
1958 }
1959
1960 open_flags = O_WRONLY | O_CREAT | O_APPEND;
1961
1962 if (backend->fsync)
1963 open_flags |= O_FSYNC;
1964
1965 error = git_futils_writebuffer(&buf, git_buf_cstr(&path), open_flags, GIT_REFLOG_FILE_MODE);
1966
1967 cleanup:
1968 git_buf_dispose(&buf);
1969 git_buf_dispose(&path);
1970
1971 return error;
1972 }
1973
refdb_reflog_fs__rename(git_refdb_backend * _backend,const char * old_name,const char * new_name)1974 static int refdb_reflog_fs__rename(git_refdb_backend *_backend, const char *old_name, const char *new_name)
1975 {
1976 int error = 0, fd;
1977 git_buf old_path = GIT_BUF_INIT;
1978 git_buf new_path = GIT_BUF_INIT;
1979 git_buf temp_path = GIT_BUF_INIT;
1980 git_buf normalized = GIT_BUF_INIT;
1981 git_repository *repo;
1982 refdb_fs_backend *backend;
1983
1984 GIT_ASSERT_ARG(_backend);
1985 GIT_ASSERT_ARG(old_name);
1986 GIT_ASSERT_ARG(new_name);
1987
1988 backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
1989 repo = backend->repo;
1990
1991 if ((error = git_reference__normalize_name(
1992 &normalized, new_name, GIT_REFERENCE_FORMAT_ALLOW_ONELEVEL)) < 0)
1993 return error;
1994
1995 if (git_buf_joinpath(&temp_path, repo->gitdir, GIT_REFLOG_DIR) < 0)
1996 return -1;
1997
1998 if (git_buf_joinpath(&old_path, git_buf_cstr(&temp_path), old_name) < 0)
1999 return -1;
2000
2001 if (git_buf_joinpath(&new_path, git_buf_cstr(&temp_path), git_buf_cstr(&normalized)) < 0)
2002 return -1;
2003
2004 if (!git_path_exists(git_buf_cstr(&old_path))) {
2005 error = GIT_ENOTFOUND;
2006 goto cleanup;
2007 }
2008
2009 /*
2010 * Move the reflog to a temporary place. This two-phase renaming is required
2011 * in order to cope with funny renaming use cases when one tries to move a reference
2012 * to a partially colliding namespace:
2013 * - a/b -> a/b/c
2014 * - a/b/c/d -> a/b/c
2015 */
2016 if (git_buf_joinpath(&temp_path, git_buf_cstr(&temp_path), "temp_reflog") < 0)
2017 return -1;
2018
2019 if ((fd = git_futils_mktmp(&temp_path, git_buf_cstr(&temp_path), GIT_REFLOG_FILE_MODE)) < 0) {
2020 error = -1;
2021 goto cleanup;
2022 }
2023
2024 p_close(fd);
2025
2026 if (p_rename(git_buf_cstr(&old_path), git_buf_cstr(&temp_path)) < 0) {
2027 git_error_set(GIT_ERROR_OS, "failed to rename reflog for %s", new_name);
2028 error = -1;
2029 goto cleanup;
2030 }
2031
2032 if (git_path_isdir(git_buf_cstr(&new_path)) &&
2033 (git_futils_rmdir_r(git_buf_cstr(&new_path), NULL, GIT_RMDIR_SKIP_NONEMPTY) < 0)) {
2034 error = -1;
2035 goto cleanup;
2036 }
2037
2038 if (git_futils_mkpath2file(git_buf_cstr(&new_path), GIT_REFLOG_DIR_MODE) < 0) {
2039 error = -1;
2040 goto cleanup;
2041 }
2042
2043 if (p_rename(git_buf_cstr(&temp_path), git_buf_cstr(&new_path)) < 0) {
2044 git_error_set(GIT_ERROR_OS, "failed to rename reflog for %s", new_name);
2045 error = -1;
2046 }
2047
2048 cleanup:
2049 git_buf_dispose(&temp_path);
2050 git_buf_dispose(&old_path);
2051 git_buf_dispose(&new_path);
2052 git_buf_dispose(&normalized);
2053
2054 return error;
2055 }
2056
refdb_reflog_fs__delete(git_refdb_backend * _backend,const char * name)2057 static int refdb_reflog_fs__delete(git_refdb_backend *_backend, const char *name)
2058 {
2059 refdb_fs_backend *backend = GIT_CONTAINER_OF(_backend, refdb_fs_backend, parent);
2060 git_buf path = GIT_BUF_INIT;
2061 int error;
2062
2063 GIT_ASSERT_ARG(_backend);
2064 GIT_ASSERT_ARG(name);
2065
2066 if ((error = retrieve_reflog_path(&path, backend->repo, name)) < 0)
2067 goto out;
2068
2069 if (!git_path_exists(path.ptr))
2070 goto out;
2071
2072 if ((error = p_unlink(path.ptr)) < 0)
2073 goto out;
2074
2075 error = refdb_fs_backend__prune_refs(backend, name, GIT_REFLOG_DIR);
2076
2077 out:
2078 git_buf_dispose(&path);
2079
2080 return error;
2081 }
2082
git_refdb_backend_fs(git_refdb_backend ** backend_out,git_repository * repository)2083 int git_refdb_backend_fs(
2084 git_refdb_backend **backend_out,
2085 git_repository *repository)
2086 {
2087 int t = 0;
2088 git_buf gitpath = GIT_BUF_INIT;
2089 refdb_fs_backend *backend;
2090
2091 backend = git__calloc(1, sizeof(refdb_fs_backend));
2092 GIT_ERROR_CHECK_ALLOC(backend);
2093
2094 if (git_refdb_init_backend(&backend->parent, GIT_REFDB_BACKEND_VERSION) < 0)
2095 goto fail;
2096
2097 backend->repo = repository;
2098
2099 if (repository->gitdir) {
2100 backend->gitpath = setup_namespace(repository, repository->gitdir);
2101
2102 if (backend->gitpath == NULL)
2103 goto fail;
2104 }
2105
2106 if (repository->commondir) {
2107 backend->commonpath = setup_namespace(repository, repository->commondir);
2108
2109 if (backend->commonpath == NULL)
2110 goto fail;
2111 }
2112
2113 if (git_buf_joinpath(&gitpath, backend->commonpath, GIT_PACKEDREFS_FILE) < 0 ||
2114 git_sortedcache_new(
2115 &backend->refcache, offsetof(struct packref, name),
2116 NULL, NULL, packref_cmp, git_buf_cstr(&gitpath)) < 0)
2117 goto fail;
2118
2119 git_buf_dispose(&gitpath);
2120
2121 if (!git_repository__configmap_lookup(&t, backend->repo, GIT_CONFIGMAP_IGNORECASE) && t) {
2122 backend->iterator_flags |= GIT_ITERATOR_IGNORE_CASE;
2123 backend->direach_flags |= GIT_PATH_DIR_IGNORE_CASE;
2124 }
2125 if (!git_repository__configmap_lookup(&t, backend->repo, GIT_CONFIGMAP_PRECOMPOSE) && t) {
2126 backend->iterator_flags |= GIT_ITERATOR_PRECOMPOSE_UNICODE;
2127 backend->direach_flags |= GIT_PATH_DIR_PRECOMPOSE_UNICODE;
2128 }
2129 if ((!git_repository__configmap_lookup(&t, backend->repo, GIT_CONFIGMAP_FSYNCOBJECTFILES) && t) ||
2130 git_repository__fsync_gitdir)
2131 backend->fsync = 1;
2132 backend->iterator_flags |= GIT_ITERATOR_DESCEND_SYMLINKS;
2133
2134 backend->parent.exists = &refdb_fs_backend__exists;
2135 backend->parent.lookup = &refdb_fs_backend__lookup;
2136 backend->parent.iterator = &refdb_fs_backend__iterator;
2137 backend->parent.write = &refdb_fs_backend__write;
2138 backend->parent.del = &refdb_fs_backend__delete;
2139 backend->parent.rename = &refdb_fs_backend__rename;
2140 backend->parent.compress = &refdb_fs_backend__compress;
2141 backend->parent.lock = &refdb_fs_backend__lock;
2142 backend->parent.unlock = &refdb_fs_backend__unlock;
2143 backend->parent.has_log = &refdb_reflog_fs__has_log;
2144 backend->parent.ensure_log = &refdb_reflog_fs__ensure_log;
2145 backend->parent.free = &refdb_fs_backend__free;
2146 backend->parent.reflog_read = &refdb_reflog_fs__read;
2147 backend->parent.reflog_write = &refdb_reflog_fs__write;
2148 backend->parent.reflog_rename = &refdb_reflog_fs__rename;
2149 backend->parent.reflog_delete = &refdb_reflog_fs__delete;
2150
2151 *backend_out = (git_refdb_backend *)backend;
2152 return 0;
2153
2154 fail:
2155 git_buf_dispose(&gitpath);
2156 git__free(backend->gitpath);
2157 git__free(backend->commonpath);
2158 git__free(backend);
2159 return -1;
2160 }
2161