1/*
2 * The backend-independent part of the reference module.
3 */
4
5#include "cache.h"
6#include "config.h"
7#include "hashmap.h"
8#include "lockfile.h"
9#include "iterator.h"
10#include "refs.h"
11#include "refs/refs-internal.h"
12#include "object-store.h"
13#include "object.h"
14#include "tag.h"
15#include "submodule.h"
16#include "worktree.h"
17#include "argv-array.h"
18#include "repository.h"
19
20/*
21 * List of all available backends
22 */
23static struct ref_storage_be *refs_backends = &refs_be_files;
24
25static struct ref_storage_be *find_ref_storage_backend(const char *name)
26{
27 struct ref_storage_be *be;
28 for (be = refs_backends; be; be = be->next)
29 if (!strcmp(be->name, name))
30 return be;
31 return NULL;
32}
33
34int ref_storage_backend_exists(const char *name)
35{
36 return find_ref_storage_backend(name) != NULL;
37}
38
39/*
40 * How to handle various characters in refnames:
41 * 0: An acceptable character for refs
42 * 1: End-of-component
43 * 2: ., look for a preceding . to reject .. in refs
44 * 3: {, look for a preceding @ to reject @{ in refs
45 * 4: A bad character: ASCII control characters, and
46 * ":", "?", "[", "\", "^", "~", SP, or TAB
47 * 5: *, reject unless REFNAME_REFSPEC_PATTERN is set
48 */
49static unsigned char refname_disposition[256] = {
50 1, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
51 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
52 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 2, 1,
53 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 4,
54 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
55 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4, 0, 4, 0,
56 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
57 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 4, 4
58};
59
60/*
61 * Try to read one refname component from the front of refname.
62 * Return the length of the component found, or -1 if the component is
63 * not legal. It is legal if it is something reasonable to have under
64 * ".git/refs/"; We do not like it if:
65 *
66 * - any path component of it begins with ".", or
67 * - it has double dots "..", or
68 * - it has ASCII control characters, or
69 * - it has ":", "?", "[", "\", "^", "~", SP, or TAB anywhere, or
70 * - it has "*" anywhere unless REFNAME_REFSPEC_PATTERN is set, or
71 * - it ends with a "/", or
72 * - it ends with ".lock", or
73 * - it contains a "@{" portion
74 */
75static int check_refname_component(const char *refname, int *flags)
76{
77 const char *cp;
78 char last = '\0';
79
80 for (cp = refname; ; cp++) {
81 int ch = *cp & 255;
82 unsigned char disp = refname_disposition[ch];
83 switch (disp) {
84 case 1:
85 goto out;
86 case 2:
87 if (last == '.')
88 return -1; /* Refname contains "..". */
89 break;
90 case 3:
91 if (last == '@')
92 return -1; /* Refname contains "@{". */
93 break;
94 case 4:
95 return -1;
96 case 5:
97 if (!(*flags & REFNAME_REFSPEC_PATTERN))
98 return -1; /* refspec can't be a pattern */
99
100 /*
101 * Unset the pattern flag so that we only accept
102 * a single asterisk for one side of refspec.
103 */
104 *flags &= ~ REFNAME_REFSPEC_PATTERN;
105 break;
106 }
107 last = ch;
108 }
109out:
110 if (cp == refname)
111 return 0; /* Component has zero length. */
112 if (refname[0] == '.')
113 return -1; /* Component starts with '.'. */
114 if (cp - refname >= LOCK_SUFFIX_LEN &&
115 !memcmp(cp - LOCK_SUFFIX_LEN, LOCK_SUFFIX, LOCK_SUFFIX_LEN))
116 return -1; /* Refname ends with ".lock". */
117 return cp - refname;
118}
119
120int check_refname_format(const char *refname, int flags)
121{
122 int component_len, component_count = 0;
123
124 if (!strcmp(refname, "@"))
125 /* Refname is a single character '@'. */
126 return -1;
127
128 while (1) {
129 /* We are at the start of a path component. */
130 component_len = check_refname_component(refname, &flags);
131 if (component_len <= 0)
132 return -1;
133
134 component_count++;
135 if (refname[component_len] == '\0')
136 break;
137 /* Skip to next component. */
138 refname += component_len + 1;
139 }
140
141 if (refname[component_len - 1] == '.')
142 return -1; /* Refname ends with '.'. */
143 if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2)
144 return -1; /* Refname has only one component. */
145 return 0;
146}
147
148int refname_is_safe(const char *refname)
149{
150 const char *rest;
151
152 if (skip_prefix(refname, "refs/", &rest)) {
153 char *buf;
154 int result;
155 size_t restlen = strlen(rest);
156
157 /* rest must not be empty, or start or end with "/" */
158 if (!restlen || *rest == '/' || rest[restlen - 1] == '/')
159 return 0;
160
161 /*
162 * Does the refname try to escape refs/?
163 * For example: refs/foo/../bar is safe but refs/foo/../../bar
164 * is not.
165 */
166 buf = xmallocz(restlen);
167 result = !normalize_path_copy(buf, rest) && !strcmp(buf, rest);
168 free(buf);
169 return result;
170 }
171
172 do {
173 if (!isupper(*refname) && *refname != '_')
174 return 0;
175 refname++;
176 } while (*refname);
177 return 1;
178}
179
180/*
181 * Return true if refname, which has the specified oid and flags, can
182 * be resolved to an object in the database. If the referred-to object
183 * does not exist, emit a warning and return false.
184 */
185int ref_resolves_to_object(const char *refname,
186 const struct object_id *oid,
187 unsigned int flags)
188{
189 if (flags & REF_ISBROKEN)
190 return 0;
191 if (!has_object_file(oid)) {
192 error(_("%s does not point to a valid object!"), refname);
193 return 0;
194 }
195 return 1;
196}
197
198char *refs_resolve_refdup(struct ref_store *refs,
199 const char *refname, int resolve_flags,
200 struct object_id *oid, int *flags)
201{
202 const char *result;
203
204 result = refs_resolve_ref_unsafe(refs, refname, resolve_flags,
205 oid, flags);
206 return xstrdup_or_null(result);
207}
208
209char *resolve_refdup(const char *refname, int resolve_flags,
210 struct object_id *oid, int *flags)
211{
212 return refs_resolve_refdup(get_main_ref_store(the_repository),
213 refname, resolve_flags,
214 oid, flags);
215}
216
217/* The argument to filter_refs */
218struct ref_filter {
219 const char *pattern;
220 const char *prefix;
221 each_ref_fn *fn;
222 void *cb_data;
223};
224
225int refs_read_ref_full(struct ref_store *refs, const char *refname,
226 int resolve_flags, struct object_id *oid, int *flags)
227{
228 if (refs_resolve_ref_unsafe(refs, refname, resolve_flags, oid, flags))
229 return 0;
230 return -1;
231}
232
233int read_ref_full(const char *refname, int resolve_flags, struct object_id *oid, int *flags)
234{
235 return refs_read_ref_full(get_main_ref_store(the_repository), refname,
236 resolve_flags, oid, flags);
237}
238
239int read_ref(const char *refname, struct object_id *oid)
240{
241 return read_ref_full(refname, RESOLVE_REF_READING, oid, NULL);
242}
243
244static int refs_ref_exists(struct ref_store *refs, const char *refname)
245{
246 return !!refs_resolve_ref_unsafe(refs, refname, RESOLVE_REF_READING, NULL, NULL);
247}
248
249int ref_exists(const char *refname)
250{
251 return refs_ref_exists(get_main_ref_store(the_repository), refname);
252}
253
254static int match_ref_pattern(const char *refname,
255 const struct string_list_item *item)
256{
257 int matched = 0;
258 if (item->util == NULL) {
259 if (!wildmatch(item->string, refname, 0))
260 matched = 1;
261 } else {
262 const char *rest;
263 if (skip_prefix(refname, item->string, &rest) &&
264 (!*rest || *rest == '/'))
265 matched = 1;
266 }
267 return matched;
268}
269
270int ref_filter_match(const char *refname,
271 const struct string_list *include_patterns,
272 const struct string_list *exclude_patterns)
273{
274 struct string_list_item *item;
275
276 if (exclude_patterns && exclude_patterns->nr) {
277 for_each_string_list_item(item, exclude_patterns) {
278 if (match_ref_pattern(refname, item))
279 return 0;
280 }
281 }
282
283 if (include_patterns && include_patterns->nr) {
284 int found = 0;
285 for_each_string_list_item(item, include_patterns) {
286 if (match_ref_pattern(refname, item)) {
287 found = 1;
288 break;
289 }
290 }
291
292 if (!found)
293 return 0;
294 }
295 return 1;
296}
297
298static int filter_refs(const char *refname, const struct object_id *oid,
299 int flags, void *data)
300{
301 struct ref_filter *filter = (struct ref_filter *)data;
302
303 if (wildmatch(filter->pattern, refname, 0))
304 return 0;
305 if (filter->prefix)
306 skip_prefix(refname, filter->prefix, &refname);
307 return filter->fn(refname, oid, flags, filter->cb_data);
308}
309
310enum peel_status peel_object(const struct object_id *name, struct object_id *oid)
311{
312 struct object *o = lookup_unknown_object(name->hash);
313
314 if (o->type == OBJ_NONE) {
315 int type = oid_object_info(the_repository, name, NULL);
316 if (type < 0 || !object_as_type(the_repository, o, type, 0))
317 return PEEL_INVALID;
318 }
319
320 if (o->type != OBJ_TAG)
321 return PEEL_NON_TAG;
322
323 o = deref_tag_noverify(o);
324 if (!o)
325 return PEEL_INVALID;
326
327 oidcpy(oid, &o->oid);
328 return PEEL_PEELED;
329}
330
331struct warn_if_dangling_data {
332 FILE *fp;
333 const char *refname;
334 const struct string_list *refnames;
335 const char *msg_fmt;
336};
337
338static int warn_if_dangling_symref(const char *refname, const struct object_id *oid,
339 int flags, void *cb_data)
340{
341 struct warn_if_dangling_data *d = cb_data;
342 const char *resolves_to;
343
344 if (!(flags & REF_ISSYMREF))
345 return 0;
346
347 resolves_to = resolve_ref_unsafe(refname, 0, NULL, NULL);
348 if (!resolves_to
349 || (d->refname
350 ? strcmp(resolves_to, d->refname)
351 : !string_list_has_string(d->refnames, resolves_to))) {
352 return 0;
353 }
354
355 fprintf(d->fp, d->msg_fmt, refname);
356 fputc('\n', d->fp);
357 return 0;
358}
359
360void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
361{
362 struct warn_if_dangling_data data;
363
364 data.fp = fp;
365 data.refname = refname;
366 data.refnames = NULL;
367 data.msg_fmt = msg_fmt;
368 for_each_rawref(warn_if_dangling_symref, &data);
369}
370
371void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames)
372{
373 struct warn_if_dangling_data data;
374
375 data.fp = fp;
376 data.refname = NULL;
377 data.refnames = refnames;
378 data.msg_fmt = msg_fmt;
379 for_each_rawref(warn_if_dangling_symref, &data);
380}
381
382int refs_for_each_tag_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
383{
384 return refs_for_each_ref_in(refs, "refs/tags/", fn, cb_data);
385}
386
387int for_each_tag_ref(each_ref_fn fn, void *cb_data)
388{
389 return refs_for_each_tag_ref(get_main_ref_store(the_repository), fn, cb_data);
390}
391
392int refs_for_each_branch_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
393{
394 return refs_for_each_ref_in(refs, "refs/heads/", fn, cb_data);
395}
396
397int for_each_branch_ref(each_ref_fn fn, void *cb_data)
398{
399 return refs_for_each_branch_ref(get_main_ref_store(the_repository), fn, cb_data);
400}
401
402int refs_for_each_remote_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
403{
404 return refs_for_each_ref_in(refs, "refs/remotes/", fn, cb_data);
405}
406
407int for_each_remote_ref(each_ref_fn fn, void *cb_data)
408{
409 return refs_for_each_remote_ref(get_main_ref_store(the_repository), fn, cb_data);
410}
411
412int head_ref_namespaced(each_ref_fn fn, void *cb_data)
413{
414 struct strbuf buf = STRBUF_INIT;
415 int ret = 0;
416 struct object_id oid;
417 int flag;
418
419 strbuf_addf(&buf, "%sHEAD", get_git_namespace());
420 if (!read_ref_full(buf.buf, RESOLVE_REF_READING, &oid, &flag))
421 ret = fn(buf.buf, &oid, flag, cb_data);
422 strbuf_release(&buf);
423
424 return ret;
425}
426
427void normalize_glob_ref(struct string_list_item *item, const char *prefix,
428 const char *pattern)
429{
430 struct strbuf normalized_pattern = STRBUF_INIT;
431
432 if (*pattern == '/')
433 BUG("pattern must not start with '/'");
434
435 if (prefix) {
436 strbuf_addstr(&normalized_pattern, prefix);
437 }
438 else if (!starts_with(pattern, "refs/"))
439 strbuf_addstr(&normalized_pattern, "refs/");
440 strbuf_addstr(&normalized_pattern, pattern);
441 strbuf_strip_suffix(&normalized_pattern, "/");
442
443 item->string = strbuf_detach(&normalized_pattern, NULL);
444 item->util = has_glob_specials(pattern) ? NULL : item->string;
445 strbuf_release(&normalized_pattern);
446}
447
448int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
449 const char *prefix, void *cb_data)
450{
451 struct strbuf real_pattern = STRBUF_INIT;
452 struct ref_filter filter;
453 int ret;
454
455 if (!prefix && !starts_with(pattern, "refs/"))
456 strbuf_addstr(&real_pattern, "refs/");
457 else if (prefix)
458 strbuf_addstr(&real_pattern, prefix);
459 strbuf_addstr(&real_pattern, pattern);
460
461 if (!has_glob_specials(pattern)) {
462 /* Append implied '/' '*' if not present. */
463 strbuf_complete(&real_pattern, '/');
464 /* No need to check for '*', there is none. */
465 strbuf_addch(&real_pattern, '*');
466 }
467
468 filter.pattern = real_pattern.buf;
469 filter.prefix = prefix;
470 filter.fn = fn;
471 filter.cb_data = cb_data;
472 ret = for_each_ref(filter_refs, &filter);
473
474 strbuf_release(&real_pattern);
475 return ret;
476}
477
478int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
479{
480 return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
481}
482
483const char *prettify_refname(const char *name)
484{
485 if (skip_prefix(name, "refs/heads/", &name) ||
486 skip_prefix(name, "refs/tags/", &name) ||
487 skip_prefix(name, "refs/remotes/", &name))
488 ; /* nothing */
489 return name;
490}
491
492static const char *ref_rev_parse_rules[] = {
493 "%.*s",
494 "refs/%.*s",
495 "refs/tags/%.*s",
496 "refs/heads/%.*s",
497 "refs/remotes/%.*s",
498 "refs/remotes/%.*s/HEAD",
499 NULL
500};
501
502#define NUM_REV_PARSE_RULES (ARRAY_SIZE(ref_rev_parse_rules) - 1)
503
504/*
505 * Is it possible that the caller meant full_name with abbrev_name?
506 * If so return a non-zero value to signal "yes"; the magnitude of
507 * the returned value gives the precedence used for disambiguation.
508 *
509 * If abbrev_name cannot mean full_name, return 0.
510 */
511int refname_match(const char *abbrev_name, const char *full_name)
512{
513 const char **p;
514 const int abbrev_name_len = strlen(abbrev_name);
515 const int num_rules = NUM_REV_PARSE_RULES;
516
517 for (p = ref_rev_parse_rules; *p; p++)
518 if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name)))
519 return &ref_rev_parse_rules[num_rules] - p;
520
521 return 0;
522}
523
524/*
525 * Given a 'prefix' expand it by the rules in 'ref_rev_parse_rules' and add
526 * the results to 'prefixes'
527 */
528void expand_ref_prefix(struct argv_array *prefixes, const char *prefix)
529{
530 const char **p;
531 int len = strlen(prefix);
532
533 for (p = ref_rev_parse_rules; *p; p++)
534 argv_array_pushf(prefixes, *p, len, prefix);
535}
536
537/*
538 * *string and *len will only be substituted, and *string returned (for
539 * later free()ing) if the string passed in is a magic short-hand form
540 * to name a branch.
541 */
542static char *substitute_branch_name(struct repository *r,
543 const char **string, int *len)
544{
545 struct strbuf buf = STRBUF_INIT;
546 int ret = repo_interpret_branch_name(r, *string, *len, &buf, 0);
547
548 if (ret == *len) {
549 size_t size;
550 *string = strbuf_detach(&buf, &size);
551 *len = size;
552 return (char *)*string;
553 }
554
555 return NULL;
556}
557
558int repo_dwim_ref(struct repository *r, const char *str, int len,
559 struct object_id *oid, char **ref)
560{
561 char *last_branch = substitute_branch_name(r, &str, &len);
562 int refs_found = expand_ref(r, str, len, oid, ref);
563 free(last_branch);
564 return refs_found;
565}
566
567int dwim_ref(const char *str, int len, struct object_id *oid, char **ref)
568{
569 return repo_dwim_ref(the_repository, str, len, oid, ref);
570}
571
572int expand_ref(struct repository *repo, const char *str, int len,
573 struct object_id *oid, char **ref)
574{
575 const char **p, *r;
576 int refs_found = 0;
577 struct strbuf fullref = STRBUF_INIT;
578
579 *ref = NULL;
580 for (p = ref_rev_parse_rules; *p; p++) {
581 struct object_id oid_from_ref;
582 struct object_id *this_result;
583 int flag;
584
585 this_result = refs_found ? &oid_from_ref : oid;
586 strbuf_reset(&fullref);
587 strbuf_addf(&fullref, *p, len, str);
588 r = refs_resolve_ref_unsafe(get_main_ref_store(repo),
589 fullref.buf, RESOLVE_REF_READING,
590 this_result, &flag);
591 if (r) {
592 if (!refs_found++)
593 *ref = xstrdup(r);
594 if (!warn_ambiguous_refs)
595 break;
596 } else if ((flag & REF_ISSYMREF) && strcmp(fullref.buf, "HEAD")) {
597 warning(_("ignoring dangling symref %s"), fullref.buf);
598 } else if ((flag & REF_ISBROKEN) && strchr(fullref.buf, '/')) {
599 warning(_("ignoring broken ref %s"), fullref.buf);
600 }
601 }
602 strbuf_release(&fullref);
603 return refs_found;
604}
605
606int dwim_log(const char *str, int len, struct object_id *oid, char **log)
607{
608 char *last_branch = substitute_branch_name(the_repository, &str, &len);
609 const char **p;
610 int logs_found = 0;
611 struct strbuf path = STRBUF_INIT;
612
613 *log = NULL;
614 for (p = ref_rev_parse_rules; *p; p++) {
615 struct object_id hash;
616 const char *ref, *it;
617
618 strbuf_reset(&path);
619 strbuf_addf(&path, *p, len, str);
620 ref = resolve_ref_unsafe(path.buf, RESOLVE_REF_READING,
621 &hash, NULL);
622 if (!ref)
623 continue;
624 if (reflog_exists(path.buf))
625 it = path.buf;
626 else if (strcmp(ref, path.buf) && reflog_exists(ref))
627 it = ref;
628 else
629 continue;
630 if (!logs_found++) {
631 *log = xstrdup(it);
632 oidcpy(oid, &hash);
633 }
634 if (!warn_ambiguous_refs)
635 break;
636 }
637 strbuf_release(&path);
638 free(last_branch);
639 return logs_found;
640}
641
642static int is_per_worktree_ref(const char *refname)
643{
644 return !strcmp(refname, "HEAD") ||
645 starts_with(refname, "refs/worktree/") ||
646 starts_with(refname, "refs/bisect/") ||
647 starts_with(refname, "refs/rewritten/");
648}
649
650static int is_pseudoref_syntax(const char *refname)
651{
652 const char *c;
653
654 for (c = refname; *c; c++) {
655 if (!isupper(*c) && *c != '-' && *c != '_')
656 return 0;
657 }
658
659 return 1;
660}
661
662static int is_main_pseudoref_syntax(const char *refname)
663{
664 return skip_prefix(refname, "main-worktree/", &refname) &&
665 *refname &&
666 is_pseudoref_syntax(refname);
667}
668
669static int is_other_pseudoref_syntax(const char *refname)
670{
671 if (!skip_prefix(refname, "worktrees/", &refname))
672 return 0;
673 refname = strchr(refname, '/');
674 if (!refname || !refname[1])
675 return 0;
676 return is_pseudoref_syntax(refname + 1);
677}
678
679enum ref_type ref_type(const char *refname)
680{
681 if (is_per_worktree_ref(refname))
682 return REF_TYPE_PER_WORKTREE;
683 if (is_pseudoref_syntax(refname))
684 return REF_TYPE_PSEUDOREF;
685 if (is_main_pseudoref_syntax(refname))
686 return REF_TYPE_MAIN_PSEUDOREF;
687 if (is_other_pseudoref_syntax(refname))
688 return REF_TYPE_OTHER_PSEUDOREF;
689 return REF_TYPE_NORMAL;
690}
691
692long get_files_ref_lock_timeout_ms(void)
693{
694 static int configured = 0;
695
696 /* The default timeout is 100 ms: */
697 static int timeout_ms = 100;
698
699 if (!configured) {
700 git_config_get_int("core.filesreflocktimeout", &timeout_ms);
701 configured = 1;
702 }
703
704 return timeout_ms;
705}
706
707static int write_pseudoref(const char *pseudoref, const struct object_id *oid,
708 const struct object_id *old_oid, struct strbuf *err)
709{
710 const char *filename;
711 int fd;
712 struct lock_file lock = LOCK_INIT;
713 struct strbuf buf = STRBUF_INIT;
714 int ret = -1;
715
716 if (!oid)
717 return 0;
718
719 strbuf_addf(&buf, "%s\n", oid_to_hex(oid));
720
721 filename = git_path("%s", pseudoref);
722 fd = hold_lock_file_for_update_timeout(&lock, filename, 0,
723 get_files_ref_lock_timeout_ms());
724 if (fd < 0) {
725 strbuf_addf(err, _("could not open '%s' for writing: %s"),
726 filename, strerror(errno));
727 goto done;
728 }
729
730 if (old_oid) {
731 struct object_id actual_old_oid;
732
733 if (read_ref(pseudoref, &actual_old_oid)) {
734 if (!is_null_oid(old_oid)) {
735 strbuf_addf(err, _("could not read ref '%s'"),
736 pseudoref);
737 rollback_lock_file(&lock);
738 goto done;
739 }
740 } else if (is_null_oid(old_oid)) {
741 strbuf_addf(err, _("ref '%s' already exists"),
742 pseudoref);
743 rollback_lock_file(&lock);
744 goto done;
745 } else if (!oideq(&actual_old_oid, old_oid)) {
746 strbuf_addf(err, _("unexpected object ID when writing '%s'"),
747 pseudoref);
748 rollback_lock_file(&lock);
749 goto done;
750 }
751 }
752
753 if (write_in_full(fd, buf.buf, buf.len) < 0) {
754 strbuf_addf(err, _("could not write to '%s'"), filename);
755 rollback_lock_file(&lock);
756 goto done;
757 }
758
759 commit_lock_file(&lock);
760 ret = 0;
761done:
762 strbuf_release(&buf);
763 return ret;
764}
765
766static int delete_pseudoref(const char *pseudoref, const struct object_id *old_oid)
767{
768 const char *filename;
769
770 filename = git_path("%s", pseudoref);
771
772 if (old_oid && !is_null_oid(old_oid)) {
773 struct lock_file lock = LOCK_INIT;
774 int fd;
775 struct object_id actual_old_oid;
776
777 fd = hold_lock_file_for_update_timeout(
778 &lock, filename, 0,
779 get_files_ref_lock_timeout_ms());
780 if (fd < 0) {
781 error_errno(_("could not open '%s' for writing"),
782 filename);
783 return -1;
784 }
785 if (read_ref(pseudoref, &actual_old_oid))
786 die(_("could not read ref '%s'"), pseudoref);
787 if (!oideq(&actual_old_oid, old_oid)) {
788 error(_("unexpected object ID when deleting '%s'"),
789 pseudoref);
790 rollback_lock_file(&lock);
791 return -1;
792 }
793
794 unlink(filename);
795 rollback_lock_file(&lock);
796 } else {
797 unlink(filename);
798 }
799
800 return 0;
801}
802
803int refs_delete_ref(struct ref_store *refs, const char *msg,
804 const char *refname,
805 const struct object_id *old_oid,
806 unsigned int flags)
807{
808 struct ref_transaction *transaction;
809 struct strbuf err = STRBUF_INIT;
810
811 if (ref_type(refname) == REF_TYPE_PSEUDOREF) {
812 assert(refs == get_main_ref_store(the_repository));
813 return delete_pseudoref(refname, old_oid);
814 }
815
816 transaction = ref_store_transaction_begin(refs, &err);
817 if (!transaction ||
818 ref_transaction_delete(transaction, refname, old_oid,
819 flags, msg, &err) ||
820 ref_transaction_commit(transaction, &err)) {
821 error("%s", err.buf);
822 ref_transaction_free(transaction);
823 strbuf_release(&err);
824 return 1;
825 }
826 ref_transaction_free(transaction);
827 strbuf_release(&err);
828 return 0;
829}
830
831int delete_ref(const char *msg, const char *refname,
832 const struct object_id *old_oid, unsigned int flags)
833{
834 return refs_delete_ref(get_main_ref_store(the_repository), msg, refname,
835 old_oid, flags);
836}
837
838void copy_reflog_msg(struct strbuf *sb, const char *msg)
839{
840 char c;
841 int wasspace = 1;
842
843 strbuf_addch(sb, '\t');
844 while ((c = *msg++)) {
845 if (wasspace && isspace(c))
846 continue;
847 wasspace = isspace(c);
848 if (wasspace)
849 c = ' ';
850 strbuf_addch(sb, c);
851 }
852 strbuf_rtrim(sb);
853}
854
855int should_autocreate_reflog(const char *refname)
856{
857 switch (log_all_ref_updates) {
858 case LOG_REFS_ALWAYS:
859 return 1;
860 case LOG_REFS_NORMAL:
861 return starts_with(refname, "refs/heads/") ||
862 starts_with(refname, "refs/remotes/") ||
863 starts_with(refname, "refs/notes/") ||
864 !strcmp(refname, "HEAD");
865 default:
866 return 0;
867 }
868}
869
870int is_branch(const char *refname)
871{
872 return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/");
873}
874
875struct read_ref_at_cb {
876 const char *refname;
877 timestamp_t at_time;
878 int cnt;
879 int reccnt;
880 struct object_id *oid;
881 int found_it;
882
883 struct object_id ooid;
884 struct object_id noid;
885 int tz;
886 timestamp_t date;
887 char **msg;
888 timestamp_t *cutoff_time;
889 int *cutoff_tz;
890 int *cutoff_cnt;
891};
892
893static int read_ref_at_ent(struct object_id *ooid, struct object_id *noid,
894 const char *email, timestamp_t timestamp, int tz,
895 const char *message, void *cb_data)
896{
897 struct read_ref_at_cb *cb = cb_data;
898
899 cb->reccnt++;
900 cb->tz = tz;
901 cb->date = timestamp;
902
903 if (timestamp <= cb->at_time || cb->cnt == 0) {
904 if (cb->msg)
905 *cb->msg = xstrdup(message);
906 if (cb->cutoff_time)
907 *cb->cutoff_time = timestamp;
908 if (cb->cutoff_tz)
909 *cb->cutoff_tz = tz;
910 if (cb->cutoff_cnt)
911 *cb->cutoff_cnt = cb->reccnt - 1;
912 /*
913 * we have not yet updated cb->[n|o]oid so they still
914 * hold the values for the previous record.
915 */
916 if (!is_null_oid(&cb->ooid)) {
917 oidcpy(cb->oid, noid);
918 if (!oideq(&cb->ooid, noid))
919 warning(_("log for ref %s has gap after %s"),
920 cb->refname, show_date(cb->date, cb->tz, DATE_MODE(RFC2822)));
921 }
922 else if (cb->date == cb->at_time)
923 oidcpy(cb->oid, noid);
924 else if (!oideq(noid, cb->oid))
925 warning(_("log for ref %s unexpectedly ended on %s"),
926 cb->refname, show_date(cb->date, cb->tz,
927 DATE_MODE(RFC2822)));
928 oidcpy(&cb->ooid, ooid);
929 oidcpy(&cb->noid, noid);
930 cb->found_it = 1;
931 return 1;
932 }
933 oidcpy(&cb->ooid, ooid);
934 oidcpy(&cb->noid, noid);
935 if (cb->cnt > 0)
936 cb->cnt--;
937 return 0;
938}
939
940static int read_ref_at_ent_oldest(struct object_id *ooid, struct object_id *noid,
941 const char *email, timestamp_t timestamp,
942 int tz, const char *message, void *cb_data)
943{
944 struct read_ref_at_cb *cb = cb_data;
945
946 if (cb->msg)
947 *cb->msg = xstrdup(message);
948 if (cb->cutoff_time)
949 *cb->cutoff_time = timestamp;
950 if (cb->cutoff_tz)
951 *cb->cutoff_tz = tz;
952 if (cb->cutoff_cnt)
953 *cb->cutoff_cnt = cb->reccnt;
954 oidcpy(cb->oid, ooid);
955 if (is_null_oid(cb->oid))
956 oidcpy(cb->oid, noid);
957 /* We just want the first entry */
958 return 1;
959}
960
961int read_ref_at(const char *refname, unsigned int flags, timestamp_t at_time, int cnt,
962 struct object_id *oid, char **msg,
963 timestamp_t *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
964{
965 struct read_ref_at_cb cb;
966
967 memset(&cb, 0, sizeof(cb));
968 cb.refname = refname;
969 cb.at_time = at_time;
970 cb.cnt = cnt;
971 cb.msg = msg;
972 cb.cutoff_time = cutoff_time;
973 cb.cutoff_tz = cutoff_tz;
974 cb.cutoff_cnt = cutoff_cnt;
975 cb.oid = oid;
976
977 for_each_reflog_ent_reverse(refname, read_ref_at_ent, &cb);
978
979 if (!cb.reccnt) {
980 if (flags & GET_OID_QUIETLY)
981 exit(128);
982 else
983 die(_("log for %s is empty"), refname);
984 }
985 if (cb.found_it)
986 return 0;
987
988 for_each_reflog_ent(refname, read_ref_at_ent_oldest, &cb);
989
990 return 1;
991}
992
993struct ref_transaction *ref_store_transaction_begin(struct ref_store *refs,
994 struct strbuf *err)
995{
996 struct ref_transaction *tr;
997 assert(err);
998
999 tr = xcalloc(1, sizeof(struct ref_transaction));
1000 tr->ref_store = refs;
1001 return tr;
1002}
1003
1004struct ref_transaction *ref_transaction_begin(struct strbuf *err)
1005{
1006 return ref_store_transaction_begin(get_main_ref_store(the_repository), err);
1007}
1008
1009void ref_transaction_free(struct ref_transaction *transaction)
1010{
1011 size_t i;
1012
1013 if (!transaction)
1014 return;
1015
1016 switch (transaction->state) {
1017 case REF_TRANSACTION_OPEN:
1018 case REF_TRANSACTION_CLOSED:
1019 /* OK */
1020 break;
1021 case REF_TRANSACTION_PREPARED:
1022 BUG("free called on a prepared reference transaction");
1023 break;
1024 default:
1025 BUG("unexpected reference transaction state");
1026 break;
1027 }
1028
1029 for (i = 0; i < transaction->nr; i++) {
1030 free(transaction->updates[i]->msg);
1031 free(transaction->updates[i]);
1032 }
1033 free(transaction->updates);
1034 free(transaction);
1035}
1036
1037struct ref_update *ref_transaction_add_update(
1038 struct ref_transaction *transaction,
1039 const char *refname, unsigned int flags,
1040 const struct object_id *new_oid,
1041 const struct object_id *old_oid,
1042 const char *msg)
1043{
1044 struct ref_update *update;
1045
1046 if (transaction->state != REF_TRANSACTION_OPEN)
1047 BUG("update called for transaction that is not open");
1048
1049 FLEX_ALLOC_STR(update, refname, refname);
1050 ALLOC_GROW(transaction->updates, transaction->nr + 1, transaction->alloc);
1051 transaction->updates[transaction->nr++] = update;
1052
1053 update->flags = flags;
1054
1055 if (flags & REF_HAVE_NEW)
1056 oidcpy(&update->new_oid, new_oid);
1057 if (flags & REF_HAVE_OLD)
1058 oidcpy(&update->old_oid, old_oid);
1059 update->msg = xstrdup_or_null(msg);
1060 return update;
1061}
1062
1063int ref_transaction_update(struct ref_transaction *transaction,
1064 const char *refname,
1065 const struct object_id *new_oid,
1066 const struct object_id *old_oid,
1067 unsigned int flags, const char *msg,
1068 struct strbuf *err)
1069{
1070 assert(err);
1071
1072 if ((new_oid && !is_null_oid(new_oid)) ?
1073 check_refname_format(refname, REFNAME_ALLOW_ONELEVEL) :
1074 !refname_is_safe(refname)) {
1075 strbuf_addf(err, _("refusing to update ref with bad name '%s'"),
1076 refname);
1077 return -1;
1078 }
1079
1080 if (flags & ~REF_TRANSACTION_UPDATE_ALLOWED_FLAGS)
1081 BUG("illegal flags 0x%x passed to ref_transaction_update()", flags);
1082
1083 flags |= (new_oid ? REF_HAVE_NEW : 0) | (old_oid ? REF_HAVE_OLD : 0);
1084
1085 ref_transaction_add_update(transaction, refname, flags,
1086 new_oid, old_oid, msg);
1087 return 0;
1088}
1089
1090int ref_transaction_create(struct ref_transaction *transaction,
1091 const char *refname,
1092 const struct object_id *new_oid,
1093 unsigned int flags, const char *msg,
1094 struct strbuf *err)
1095{
1096 if (!new_oid || is_null_oid(new_oid))
1097 BUG("create called without valid new_oid");
1098 return ref_transaction_update(transaction, refname, new_oid,
1099 &null_oid, flags, msg, err);
1100}
1101
1102int ref_transaction_delete(struct ref_transaction *transaction,
1103 const char *refname,
1104 const struct object_id *old_oid,
1105 unsigned int flags, const char *msg,
1106 struct strbuf *err)
1107{
1108 if (old_oid && is_null_oid(old_oid))
1109 BUG("delete called with old_oid set to zeros");
1110 return ref_transaction_update(transaction, refname,
1111 &null_oid, old_oid,
1112 flags, msg, err);
1113}
1114
1115int ref_transaction_verify(struct ref_transaction *transaction,
1116 const char *refname,
1117 const struct object_id *old_oid,
1118 unsigned int flags,
1119 struct strbuf *err)
1120{
1121 if (!old_oid)
1122 BUG("verify called with old_oid set to NULL");
1123 return ref_transaction_update(transaction, refname,
1124 NULL, old_oid,
1125 flags, NULL, err);
1126}
1127
1128int refs_update_ref(struct ref_store *refs, const char *msg,
1129 const char *refname, const struct object_id *new_oid,
1130 const struct object_id *old_oid, unsigned int flags,
1131 enum action_on_err onerr)
1132{
1133 struct ref_transaction *t = NULL;
1134 struct strbuf err = STRBUF_INIT;
1135 int ret = 0;
1136
1137 if (ref_type(refname) == REF_TYPE_PSEUDOREF) {
1138 assert(refs == get_main_ref_store(the_repository));
1139 ret = write_pseudoref(refname, new_oid, old_oid, &err);
1140 } else {
1141 t = ref_store_transaction_begin(refs, &err);
1142 if (!t ||
1143 ref_transaction_update(t, refname, new_oid, old_oid,
1144 flags, msg, &err) ||
1145 ref_transaction_commit(t, &err)) {
1146 ret = 1;
1147 ref_transaction_free(t);
1148 }
1149 }
1150 if (ret) {
1151 const char *str = _("update_ref failed for ref '%s': %s");
1152
1153 switch (onerr) {
1154 case UPDATE_REFS_MSG_ON_ERR:
1155 error(str, refname, err.buf);
1156 break;
1157 case UPDATE_REFS_DIE_ON_ERR:
1158 die(str, refname, err.buf);
1159 break;
1160 case UPDATE_REFS_QUIET_ON_ERR:
1161 break;
1162 }
1163 strbuf_release(&err);
1164 return 1;
1165 }
1166 strbuf_release(&err);
1167 if (t)
1168 ref_transaction_free(t);
1169 return 0;
1170}
1171
1172int update_ref(const char *msg, const char *refname,
1173 const struct object_id *new_oid,
1174 const struct object_id *old_oid,
1175 unsigned int flags, enum action_on_err onerr)
1176{
1177 return refs_update_ref(get_main_ref_store(the_repository), msg, refname, new_oid,
1178 old_oid, flags, onerr);
1179}
1180
1181char *refs_shorten_unambiguous_ref(struct ref_store *refs,
1182 const char *refname, int strict)
1183{
1184 int i;
1185 static char **scanf_fmts;
1186 static int nr_rules;
1187 char *short_name;
1188 struct strbuf resolved_buf = STRBUF_INIT;
1189
1190 if (!nr_rules) {
1191 /*
1192 * Pre-generate scanf formats from ref_rev_parse_rules[].
1193 * Generate a format suitable for scanf from a
1194 * ref_rev_parse_rules rule by interpolating "%s" at the
1195 * location of the "%.*s".
1196 */
1197 size_t total_len = 0;
1198 size_t offset = 0;
1199
1200 /* the rule list is NULL terminated, count them first */
1201 for (nr_rules = 0; ref_rev_parse_rules[nr_rules]; nr_rules++)
1202 /* -2 for strlen("%.*s") - strlen("%s"); +1 for NUL */
1203 total_len += strlen(ref_rev_parse_rules[nr_rules]) - 2 + 1;
1204
1205 scanf_fmts = xmalloc(st_add(st_mult(sizeof(char *), nr_rules), total_len));
1206
1207 offset = 0;
1208 for (i = 0; i < nr_rules; i++) {
1209 assert(offset < total_len);
1210 scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] + offset;
1211 offset += xsnprintf(scanf_fmts[i], total_len - offset,
1212 ref_rev_parse_rules[i], 2, "%s") + 1;
1213 }
1214 }
1215
1216 /* bail out if there are no rules */
1217 if (!nr_rules)
1218 return xstrdup(refname);
1219
1220 /* buffer for scanf result, at most refname must fit */
1221 short_name = xstrdup(refname);
1222
1223 /* skip first rule, it will always match */
1224 for (i = nr_rules - 1; i > 0 ; --i) {
1225 int j;
1226 int rules_to_fail = i;
1227 int short_name_len;
1228
1229 if (1 != sscanf(refname, scanf_fmts[i], short_name))
1230 continue;
1231
1232 short_name_len = strlen(short_name);
1233
1234 /*
1235 * in strict mode, all (except the matched one) rules
1236 * must fail to resolve to a valid non-ambiguous ref
1237 */
1238 if (strict)
1239 rules_to_fail = nr_rules;
1240
1241 /*
1242 * check if the short name resolves to a valid ref,
1243 * but use only rules prior to the matched one
1244 */
1245 for (j = 0; j < rules_to_fail; j++) {
1246 const char *rule = ref_rev_parse_rules[j];
1247
1248 /* skip matched rule */
1249 if (i == j)
1250 continue;
1251
1252 /*
1253 * the short name is ambiguous, if it resolves
1254 * (with this previous rule) to a valid ref
1255 * read_ref() returns 0 on success
1256 */
1257 strbuf_reset(&resolved_buf);
1258 strbuf_addf(&resolved_buf, rule,
1259 short_name_len, short_name);
1260 if (refs_ref_exists(refs, resolved_buf.buf))
1261 break;
1262 }
1263
1264 /*
1265 * short name is non-ambiguous if all previous rules
1266 * haven't resolved to a valid ref
1267 */
1268 if (j == rules_to_fail) {
1269 strbuf_release(&resolved_buf);
1270 return short_name;
1271 }
1272 }
1273
1274 strbuf_release(&resolved_buf);
1275 free(short_name);
1276 return xstrdup(refname);
1277}
1278
1279char *shorten_unambiguous_ref(const char *refname, int strict)
1280{
1281 return refs_shorten_unambiguous_ref(get_main_ref_store(the_repository),
1282 refname, strict);
1283}
1284
1285static struct string_list *hide_refs;
1286
1287int parse_hide_refs_config(const char *var, const char *value, const char *section)
1288{
1289 const char *key;
1290 if (!strcmp("transfer.hiderefs", var) ||
1291 (!parse_config_key(var, section, NULL, NULL, &key) &&
1292 !strcmp(key, "hiderefs"))) {
1293 char *ref;
1294 int len;
1295
1296 if (!value)
1297 return config_error_nonbool(var);
1298 ref = xstrdup(value);
1299 len = strlen(ref);
1300 while (len && ref[len - 1] == '/')
1301 ref[--len] = '\0';
1302 if (!hide_refs) {
1303 hide_refs = xcalloc(1, sizeof(*hide_refs));
1304 hide_refs->strdup_strings = 1;
1305 }
1306 string_list_append(hide_refs, ref);
1307 }
1308 return 0;
1309}
1310
1311int ref_is_hidden(const char *refname, const char *refname_full)
1312{
1313 int i;
1314
1315 if (!hide_refs)
1316 return 0;
1317 for (i = hide_refs->nr - 1; i >= 0; i--) {
1318 const char *match = hide_refs->items[i].string;
1319 const char *subject;
1320 int neg = 0;
1321 const char *p;
1322
1323 if (*match == '!') {
1324 neg = 1;
1325 match++;
1326 }
1327
1328 if (*match == '^') {
1329 subject = refname_full;
1330 match++;
1331 } else {
1332 subject = refname;
1333 }
1334
1335 /* refname can be NULL when namespaces are used. */
1336 if (subject &&
1337 skip_prefix(subject, match, &p) &&
1338 (!*p || *p == '/'))
1339 return !neg;
1340 }
1341 return 0;
1342}
1343
1344const char *find_descendant_ref(const char *dirname,
1345 const struct string_list *extras,
1346 const struct string_list *skip)
1347{
1348 int pos;
1349
1350 if (!extras)
1351 return NULL;
1352
1353 /*
1354 * Look at the place where dirname would be inserted into
1355 * extras. If there is an entry at that position that starts
1356 * with dirname (remember, dirname includes the trailing
1357 * slash) and is not in skip, then we have a conflict.
1358 */
1359 for (pos = string_list_find_insert_index(extras, dirname, 0);
1360 pos < extras->nr; pos++) {
1361 const char *extra_refname = extras->items[pos].string;
1362
1363 if (!starts_with(extra_refname, dirname))
1364 break;
1365
1366 if (!skip || !string_list_has_string(skip, extra_refname))
1367 return extra_refname;
1368 }
1369 return NULL;
1370}
1371
1372int refs_rename_ref_available(struct ref_store *refs,
1373 const char *old_refname,
1374 const char *new_refname)
1375{
1376 struct string_list skip = STRING_LIST_INIT_NODUP;
1377 struct strbuf err = STRBUF_INIT;
1378 int ok;
1379
1380 string_list_insert(&skip, old_refname);
1381 ok = !refs_verify_refname_available(refs, new_refname,
1382 NULL, &skip, &err);
1383 if (!ok)
1384 error("%s", err.buf);
1385
1386 string_list_clear(&skip, 0);
1387 strbuf_release(&err);
1388 return ok;
1389}
1390
1391int refs_head_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
1392{
1393 struct object_id oid;
1394 int flag;
1395
1396 if (!refs_read_ref_full(refs, "HEAD", RESOLVE_REF_READING,
1397 &oid, &flag))
1398 return fn("HEAD", &oid, flag, cb_data);
1399
1400 return 0;
1401}
1402
1403int head_ref(each_ref_fn fn, void *cb_data)
1404{
1405 return refs_head_ref(get_main_ref_store(the_repository), fn, cb_data);
1406}
1407
1408struct ref_iterator *refs_ref_iterator_begin(
1409 struct ref_store *refs,
1410 const char *prefix, int trim, int flags)
1411{
1412 struct ref_iterator *iter;
1413
1414 if (ref_paranoia < 0)
1415 ref_paranoia = git_env_bool("GIT_REF_PARANOIA", 0);
1416 if (ref_paranoia)
1417 flags |= DO_FOR_EACH_INCLUDE_BROKEN;
1418
1419 iter = refs->be->iterator_begin(refs, prefix, flags);
1420
1421 /*
1422 * `iterator_begin()` already takes care of prefix, but we
1423 * might need to do some trimming:
1424 */
1425 if (trim)
1426 iter = prefix_ref_iterator_begin(iter, "", trim);
1427
1428 /* Sanity check for subclasses: */
1429 if (!iter->ordered)
1430 BUG("reference iterator is not ordered");
1431
1432 return iter;
1433}
1434
1435/*
1436 * Call fn for each reference in the specified submodule for which the
1437 * refname begins with prefix. If trim is non-zero, then trim that
1438 * many characters off the beginning of each refname before passing
1439 * the refname to fn. flags can be DO_FOR_EACH_INCLUDE_BROKEN to
1440 * include broken references in the iteration. If fn ever returns a
1441 * non-zero value, stop the iteration and return that value;
1442 * otherwise, return 0.
1443 */
1444static int do_for_each_repo_ref(struct repository *r, const char *prefix,
1445 each_repo_ref_fn fn, int trim, int flags,
1446 void *cb_data)
1447{
1448 struct ref_iterator *iter;
1449 struct ref_store *refs = get_main_ref_store(r);
1450
1451 if (!refs)
1452 return 0;
1453
1454 iter = refs_ref_iterator_begin(refs, prefix, trim, flags);
1455
1456 return do_for_each_repo_ref_iterator(r, iter, fn, cb_data);
1457}
1458
1459struct do_for_each_ref_help {
1460 each_ref_fn *fn;
1461 void *cb_data;
1462};
1463
1464static int do_for_each_ref_helper(struct repository *r,
1465 const char *refname,
1466 const struct object_id *oid,
1467 int flags,
1468 void *cb_data)
1469{
1470 struct do_for_each_ref_help *hp = cb_data;
1471
1472 return hp->fn(refname, oid, flags, hp->cb_data);
1473}
1474
1475static int do_for_each_ref(struct ref_store *refs, const char *prefix,
1476 each_ref_fn fn, int trim, int flags, void *cb_data)
1477{
1478 struct ref_iterator *iter;
1479 struct do_for_each_ref_help hp = { fn, cb_data };
1480
1481 if (!refs)
1482 return 0;
1483
1484 iter = refs_ref_iterator_begin(refs, prefix, trim, flags);
1485
1486 return do_for_each_repo_ref_iterator(the_repository, iter,
1487 do_for_each_ref_helper, &hp);
1488}
1489
1490int refs_for_each_ref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
1491{
1492 return do_for_each_ref(refs, "", fn, 0, 0, cb_data);
1493}
1494
1495int for_each_ref(each_ref_fn fn, void *cb_data)
1496{
1497 return refs_for_each_ref(get_main_ref_store(the_repository), fn, cb_data);
1498}
1499
1500int refs_for_each_ref_in(struct ref_store *refs, const char *prefix,
1501 each_ref_fn fn, void *cb_data)
1502{
1503 return do_for_each_ref(refs, prefix, fn, strlen(prefix), 0, cb_data);
1504}
1505
1506int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
1507{
1508 return refs_for_each_ref_in(get_main_ref_store(the_repository), prefix, fn, cb_data);
1509}
1510
1511int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data, unsigned int broken)
1512{
1513 unsigned int flag = 0;
1514
1515 if (broken)
1516 flag = DO_FOR_EACH_INCLUDE_BROKEN;
1517 return do_for_each_ref(get_main_ref_store(the_repository),
1518 prefix, fn, 0, flag, cb_data);
1519}
1520
1521int refs_for_each_fullref_in(struct ref_store *refs, const char *prefix,
1522 each_ref_fn fn, void *cb_data,
1523 unsigned int broken)
1524{
1525 unsigned int flag = 0;
1526
1527 if (broken)
1528 flag = DO_FOR_EACH_INCLUDE_BROKEN;
1529 return do_for_each_ref(refs, prefix, fn, 0, flag, cb_data);
1530}
1531
1532int for_each_replace_ref(struct repository *r, each_repo_ref_fn fn, void *cb_data)
1533{
1534 return do_for_each_repo_ref(r, git_replace_ref_base, fn,
1535 strlen(git_replace_ref_base),
1536 DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
1537}
1538
1539int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
1540{
1541 struct strbuf buf = STRBUF_INIT;
1542 int ret;
1543 strbuf_addf(&buf, "%srefs/", get_git_namespace());
1544 ret = do_for_each_ref(get_main_ref_store(the_repository),
1545 buf.buf, fn, 0, 0, cb_data);
1546 strbuf_release(&buf);
1547 return ret;
1548}
1549
1550int refs_for_each_rawref(struct ref_store *refs, each_ref_fn fn, void *cb_data)
1551{
1552 return do_for_each_ref(refs, "", fn, 0,
1553 DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
1554}
1555
1556int for_each_rawref(each_ref_fn fn, void *cb_data)
1557{
1558 return refs_for_each_rawref(get_main_ref_store(the_repository), fn, cb_data);
1559}
1560
1561int refs_read_raw_ref(struct ref_store *ref_store,
1562 const char *refname, struct object_id *oid,
1563 struct strbuf *referent, unsigned int *type)
1564{
1565 return ref_store->be->read_raw_ref(ref_store, refname, oid, referent, type);
1566}
1567
1568/* This function needs to return a meaningful errno on failure */
1569const char *refs_resolve_ref_unsafe(struct ref_store *refs,
1570 const char *refname,
1571 int resolve_flags,
1572 struct object_id *oid, int *flags)
1573{
1574 static struct strbuf sb_refname = STRBUF_INIT;
1575 struct object_id unused_oid;
1576 int unused_flags;
1577 int symref_count;
1578
1579 if (!oid)
1580 oid = &unused_oid;
1581 if (!flags)
1582 flags = &unused_flags;
1583
1584 *flags = 0;
1585
1586 if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
1587 if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
1588 !refname_is_safe(refname)) {
1589 errno = EINVAL;
1590 return NULL;
1591 }
1592
1593 /*
1594 * dwim_ref() uses REF_ISBROKEN to distinguish between
1595 * missing refs and refs that were present but invalid,
1596 * to complain about the latter to stderr.
1597 *
1598 * We don't know whether the ref exists, so don't set
1599 * REF_ISBROKEN yet.
1600 */
1601 *flags |= REF_BAD_NAME;
1602 }
1603
1604 for (symref_count = 0; symref_count < SYMREF_MAXDEPTH; symref_count++) {
1605 unsigned int read_flags = 0;
1606
1607 if (refs_read_raw_ref(refs, refname,
1608 oid, &sb_refname, &read_flags)) {
1609 *flags |= read_flags;
1610
1611 /* In reading mode, refs must eventually resolve */
1612 if (resolve_flags & RESOLVE_REF_READING)
1613 return NULL;
1614
1615 /*
1616 * Otherwise a missing ref is OK. But the files backend
1617 * may show errors besides ENOENT if there are
1618 * similarly-named refs.
1619 */
1620 if (errno != ENOENT &&
1621 errno != EISDIR &&
1622 errno != ENOTDIR)
1623 return NULL;
1624
1625 oidclr(oid);
1626 if (*flags & REF_BAD_NAME)
1627 *flags |= REF_ISBROKEN;
1628 return refname;
1629 }
1630
1631 *flags |= read_flags;
1632
1633 if (!(read_flags & REF_ISSYMREF)) {
1634 if (*flags & REF_BAD_NAME) {
1635 oidclr(oid);
1636 *flags |= REF_ISBROKEN;
1637 }
1638 return refname;
1639 }
1640
1641 refname = sb_refname.buf;
1642 if (resolve_flags & RESOLVE_REF_NO_RECURSE) {
1643 oidclr(oid);
1644 return refname;
1645 }
1646 if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
1647 if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
1648 !refname_is_safe(refname)) {
1649 errno = EINVAL;
1650 return NULL;
1651 }
1652
1653 *flags |= REF_ISBROKEN | REF_BAD_NAME;
1654 }
1655 }
1656
1657 errno = ELOOP;
1658 return NULL;
1659}
1660
1661/* backend functions */
1662int refs_init_db(struct strbuf *err)
1663{
1664 struct ref_store *refs = get_main_ref_store(the_repository);
1665
1666 return refs->be->init_db(refs, err);
1667}
1668
1669const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
1670 struct object_id *oid, int *flags)
1671{
1672 return refs_resolve_ref_unsafe(get_main_ref_store(the_repository), refname,
1673 resolve_flags, oid, flags);
1674}
1675
1676int resolve_gitlink_ref(const char *submodule, const char *refname,
1677 struct object_id *oid)
1678{
1679 struct ref_store *refs;
1680 int flags;
1681
1682 refs = get_submodule_ref_store(submodule);
1683
1684 if (!refs)
1685 return -1;
1686
1687 if (!refs_resolve_ref_unsafe(refs, refname, 0, oid, &flags) ||
1688 is_null_oid(oid))
1689 return -1;
1690 return 0;
1691}
1692
1693struct ref_store_hash_entry
1694{
1695 struct hashmap_entry ent; /* must be the first member! */
1696
1697 struct ref_store *refs;
1698
1699 /* NUL-terminated identifier of the ref store: */
1700 char name[FLEX_ARRAY];
1701};
1702
1703static int ref_store_hash_cmp(const void *unused_cmp_data,
1704 const void *entry, const void *entry_or_key,
1705 const void *keydata)
1706{
1707 const struct ref_store_hash_entry *e1 = entry, *e2 = entry_or_key;
1708 const char *name = keydata ? keydata : e2->name;
1709
1710 return strcmp(e1->name, name);
1711}
1712
1713static struct ref_store_hash_entry *alloc_ref_store_hash_entry(
1714 const char *name, struct ref_store *refs)
1715{
1716 struct ref_store_hash_entry *entry;
1717
1718 FLEX_ALLOC_STR(entry, name, name);
1719 hashmap_entry_init(entry, strhash(name));
1720 entry->refs = refs;
1721 return entry;
1722}
1723
1724/* A hashmap of ref_stores, stored by submodule name: */
1725static struct hashmap submodule_ref_stores;
1726
1727/* A hashmap of ref_stores, stored by worktree id: */
1728static struct hashmap worktree_ref_stores;
1729
1730/*
1731 * Look up a ref store by name. If that ref_store hasn't been
1732 * registered yet, return NULL.
1733 */
1734static struct ref_store *lookup_ref_store_map(struct hashmap *map,
1735 const char *name)
1736{
1737 struct ref_store_hash_entry *entry;
1738
1739 if (!map->tablesize)
1740 /* It's initialized on demand in register_ref_store(). */
1741 return NULL;
1742
1743 entry = hashmap_get_from_hash(map, strhash(name), name);
1744 return entry ? entry->refs : NULL;
1745}
1746
1747/*
1748 * Create, record, and return a ref_store instance for the specified
1749 * gitdir.
1750 */
1751static struct ref_store *ref_store_init(const char *gitdir,
1752 unsigned int flags)
1753{
1754 const char *be_name = "files";
1755 struct ref_storage_be *be = find_ref_storage_backend(be_name);
1756 struct ref_store *refs;
1757
1758 if (!be)
1759 BUG("reference backend %s is unknown", be_name);
1760
1761 refs = be->init(gitdir, flags);
1762 return refs;
1763}
1764
1765struct ref_store *get_main_ref_store(struct repository *r)
1766{
1767 if (r->refs)
1768 return r->refs;
1769
1770 if (!r->gitdir)
1771 BUG("attempting to get main_ref_store outside of repository");
1772
1773 r->refs = ref_store_init(r->gitdir, REF_STORE_ALL_CAPS);
1774 return r->refs;
1775}
1776
1777/*
1778 * Associate a ref store with a name. It is a fatal error to call this
1779 * function twice for the same name.
1780 */
1781static void register_ref_store_map(struct hashmap *map,
1782 const char *type,
1783 struct ref_store *refs,
1784 const char *name)
1785{
1786 if (!map->tablesize)
1787 hashmap_init(map, ref_store_hash_cmp, NULL, 0);
1788
1789 if (hashmap_put(map, alloc_ref_store_hash_entry(name, refs)))
1790 BUG("%s ref_store '%s' initialized twice", type, name);
1791}
1792
1793struct ref_store *get_submodule_ref_store(const char *submodule)
1794{
1795 struct strbuf submodule_sb = STRBUF_INIT;
1796 struct ref_store *refs;
1797 char *to_free = NULL;
1798 size_t len;
1799
1800 if (!submodule)
1801 return NULL;
1802
1803 len = strlen(submodule);
1804 while (len && is_dir_sep(submodule[len - 1]))
1805 len--;
1806 if (!len)
1807 return NULL;
1808
1809 if (submodule[len])
1810 /* We need to strip off one or more trailing slashes */
1811 submodule = to_free = xmemdupz(submodule, len);
1812
1813 refs = lookup_ref_store_map(&submodule_ref_stores, submodule);
1814 if (refs)
1815 goto done;
1816
1817 strbuf_addstr(&submodule_sb, submodule);
1818 if (!is_nonbare_repository_dir(&submodule_sb))
1819 goto done;
1820
1821 if (submodule_to_gitdir(&submodule_sb, submodule))
1822 goto done;
1823
1824 /* assume that add_submodule_odb() has been called */
1825 refs = ref_store_init(submodule_sb.buf,
1826 REF_STORE_READ | REF_STORE_ODB);
1827 register_ref_store_map(&submodule_ref_stores, "submodule",
1828 refs, submodule);
1829
1830done:
1831 strbuf_release(&submodule_sb);
1832 free(to_free);
1833
1834 return refs;
1835}
1836
1837struct ref_store *get_worktree_ref_store(const struct worktree *wt)
1838{
1839 struct ref_store *refs;
1840 const char *id;
1841
1842 if (wt->is_current)
1843 return get_main_ref_store(the_repository);
1844
1845 id = wt->id ? wt->id : "/";
1846 refs = lookup_ref_store_map(&worktree_ref_stores, id);
1847 if (refs)
1848 return refs;
1849
1850 if (wt->id)
1851 refs = ref_store_init(git_common_path("worktrees/%s", wt->id),
1852 REF_STORE_ALL_CAPS);
1853 else
1854 refs = ref_store_init(get_git_common_dir(),
1855 REF_STORE_ALL_CAPS);
1856
1857 if (refs)
1858 register_ref_store_map(&worktree_ref_stores, "worktree",
1859 refs, id);
1860 return refs;
1861}
1862
1863void base_ref_store_init(struct ref_store *refs,
1864 const struct ref_storage_be *be)
1865{
1866 refs->be = be;
1867}
1868
1869/* backend functions */
1870int refs_pack_refs(struct ref_store *refs, unsigned int flags)
1871{
1872 return refs->be->pack_refs(refs, flags);
1873}
1874
1875int refs_peel_ref(struct ref_store *refs, const char *refname,
1876 struct object_id *oid)
1877{
1878 int flag;
1879 struct object_id base;
1880
1881 if (current_ref_iter && current_ref_iter->refname == refname) {
1882 struct object_id peeled;
1883
1884 if (ref_iterator_peel(current_ref_iter, &peeled))
1885 return -1;
1886 oidcpy(oid, &peeled);
1887 return 0;
1888 }
1889
1890 if (refs_read_ref_full(refs, refname,
1891 RESOLVE_REF_READING, &base, &flag))
1892 return -1;
1893
1894 return peel_object(&base, oid);
1895}
1896
1897int peel_ref(const char *refname, struct object_id *oid)
1898{
1899 return refs_peel_ref(get_main_ref_store(the_repository), refname, oid);
1900}
1901
1902int refs_create_symref(struct ref_store *refs,
1903 const char *ref_target,
1904 const char *refs_heads_master,
1905 const char *logmsg)
1906{
1907 return refs->be->create_symref(refs, ref_target,
1908 refs_heads_master,
1909 logmsg);
1910}
1911
1912int create_symref(const char *ref_target, const char *refs_heads_master,
1913 const char *logmsg)
1914{
1915 return refs_create_symref(get_main_ref_store(the_repository), ref_target,
1916 refs_heads_master, logmsg);
1917}
1918
1919int ref_update_reject_duplicates(struct string_list *refnames,
1920 struct strbuf *err)
1921{
1922 size_t i, n = refnames->nr;
1923
1924 assert(err);
1925
1926 for (i = 1; i < n; i++) {
1927 int cmp = strcmp(refnames->items[i - 1].string,
1928 refnames->items[i].string);
1929
1930 if (!cmp) {
1931 strbuf_addf(err,
1932 _("multiple updates for ref '%s' not allowed"),
1933 refnames->items[i].string);
1934 return 1;
1935 } else if (cmp > 0) {
1936 BUG("ref_update_reject_duplicates() received unsorted list");
1937 }
1938 }
1939 return 0;
1940}
1941
1942int ref_transaction_prepare(struct ref_transaction *transaction,
1943 struct strbuf *err)
1944{
1945 struct ref_store *refs = transaction->ref_store;
1946
1947 switch (transaction->state) {
1948 case REF_TRANSACTION_OPEN:
1949 /* Good. */
1950 break;
1951 case REF_TRANSACTION_PREPARED:
1952 BUG("prepare called twice on reference transaction");
1953 break;
1954 case REF_TRANSACTION_CLOSED:
1955 BUG("prepare called on a closed reference transaction");
1956 break;
1957 default:
1958 BUG("unexpected reference transaction state");
1959 break;
1960 }
1961
1962 if (getenv(GIT_QUARANTINE_ENVIRONMENT)) {
1963 strbuf_addstr(err,
1964 _("ref updates forbidden inside quarantine environment"));
1965 return -1;
1966 }
1967
1968 return refs->be->transaction_prepare(refs, transaction, err);
1969}
1970
1971int ref_transaction_abort(struct ref_transaction *transaction,
1972 struct strbuf *err)
1973{
1974 struct ref_store *refs = transaction->ref_store;
1975 int ret = 0;
1976
1977 switch (transaction->state) {
1978 case REF_TRANSACTION_OPEN:
1979 /* No need to abort explicitly. */
1980 break;
1981 case REF_TRANSACTION_PREPARED:
1982 ret = refs->be->transaction_abort(refs, transaction, err);
1983 break;
1984 case REF_TRANSACTION_CLOSED:
1985 BUG("abort called on a closed reference transaction");
1986 break;
1987 default:
1988 BUG("unexpected reference transaction state");
1989 break;
1990 }
1991
1992 ref_transaction_free(transaction);
1993 return ret;
1994}
1995
1996int ref_transaction_commit(struct ref_transaction *transaction,
1997 struct strbuf *err)
1998{
1999 struct ref_store *refs = transaction->ref_store;
2000 int ret;
2001
2002 switch (transaction->state) {
2003 case REF_TRANSACTION_OPEN:
2004 /* Need to prepare first. */
2005 ret = ref_transaction_prepare(transaction, err);
2006 if (ret)
2007 return ret;
2008 break;
2009 case REF_TRANSACTION_PREPARED:
2010 /* Fall through to finish. */
2011 break;
2012 case REF_TRANSACTION_CLOSED:
2013 BUG("commit called on a closed reference transaction");
2014 break;
2015 default:
2016 BUG("unexpected reference transaction state");
2017 break;
2018 }
2019
2020 return refs->be->transaction_finish(refs, transaction, err);
2021}
2022
2023int refs_verify_refname_available(struct ref_store *refs,
2024 const char *refname,
2025 const struct string_list *extras,
2026 const struct string_list *skip,
2027 struct strbuf *err)
2028{
2029 const char *slash;
2030 const char *extra_refname;
2031 struct strbuf dirname = STRBUF_INIT;
2032 struct strbuf referent = STRBUF_INIT;
2033 struct object_id oid;
2034 unsigned int type;
2035 struct ref_iterator *iter;
2036 int ok;
2037 int ret = -1;
2038
2039 /*
2040 * For the sake of comments in this function, suppose that
2041 * refname is "refs/foo/bar".
2042 */
2043
2044 assert(err);
2045
2046 strbuf_grow(&dirname, strlen(refname) + 1);
2047 for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) {
2048 /* Expand dirname to the new prefix, not including the trailing slash: */
2049 strbuf_add(&dirname, refname + dirname.len, slash - refname - dirname.len);
2050
2051 /*
2052 * We are still at a leading dir of the refname (e.g.,
2053 * "refs/foo"; if there is a reference with that name,
2054 * it is a conflict, *unless* it is in skip.
2055 */
2056 if (skip && string_list_has_string(skip, dirname.buf))
2057 continue;
2058
2059 if (!refs_read_raw_ref(refs, dirname.buf, &oid, &referent, &type)) {
2060 strbuf_addf(err, _("'%s' exists; cannot create '%s'"),
2061 dirname.buf, refname);
2062 goto cleanup;
2063 }
2064
2065 if (extras && string_list_has_string(extras, dirname.buf)) {
2066 strbuf_addf(err, _("cannot process '%s' and '%s' at the same time"),
2067 refname, dirname.buf);
2068 goto cleanup;
2069 }
2070 }
2071
2072 /*
2073 * We are at the leaf of our refname (e.g., "refs/foo/bar").
2074 * There is no point in searching for a reference with that
2075 * name, because a refname isn't considered to conflict with
2076 * itself. But we still need to check for references whose
2077 * names are in the "refs/foo/bar/" namespace, because they
2078 * *do* conflict.
2079 */
2080 strbuf_addstr(&dirname, refname + dirname.len);
2081 strbuf_addch(&dirname, '/');
2082
2083 iter = refs_ref_iterator_begin(refs, dirname.buf, 0,
2084 DO_FOR_EACH_INCLUDE_BROKEN);
2085 while ((ok = ref_iterator_advance(iter)) == ITER_OK) {
2086 if (skip &&
2087 string_list_has_string(skip, iter->refname))
2088 continue;
2089
2090 strbuf_addf(err, _("'%s' exists; cannot create '%s'"),
2091 iter->refname, refname);
2092 ref_iterator_abort(iter);
2093 goto cleanup;
2094 }
2095
2096 if (ok != ITER_DONE)
2097 BUG("error while iterating over references");
2098
2099 extra_refname = find_descendant_ref(dirname.buf, extras, skip);
2100 if (extra_refname)
2101 strbuf_addf(err, _("cannot process '%s' and '%s' at the same time"),
2102 refname, extra_refname);
2103 else
2104 ret = 0;
2105
2106cleanup:
2107 strbuf_release(&referent);
2108 strbuf_release(&dirname);
2109 return ret;
2110}
2111
2112int refs_for_each_reflog(struct ref_store *refs, each_ref_fn fn, void *cb_data)
2113{
2114 struct ref_iterator *iter;
2115 struct do_for_each_ref_help hp = { fn, cb_data };
2116
2117 iter = refs->be->reflog_iterator_begin(refs);
2118
2119 return do_for_each_repo_ref_iterator(the_repository, iter,
2120 do_for_each_ref_helper, &hp);
2121}
2122
2123int for_each_reflog(each_ref_fn fn, void *cb_data)
2124{
2125 return refs_for_each_reflog(get_main_ref_store(the_repository), fn, cb_data);
2126}
2127
2128int refs_for_each_reflog_ent_reverse(struct ref_store *refs,
2129 const char *refname,
2130 each_reflog_ent_fn fn,
2131 void *cb_data)
2132{
2133 return refs->be->for_each_reflog_ent_reverse(refs, refname,
2134 fn, cb_data);
2135}
2136
2137int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn,
2138 void *cb_data)
2139{
2140 return refs_for_each_reflog_ent_reverse(get_main_ref_store(the_repository),
2141 refname, fn, cb_data);
2142}
2143
2144int refs_for_each_reflog_ent(struct ref_store *refs, const char *refname,
2145 each_reflog_ent_fn fn, void *cb_data)
2146{
2147 return refs->be->for_each_reflog_ent(refs, refname, fn, cb_data);
2148}
2149
2150int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn,
2151 void *cb_data)
2152{
2153 return refs_for_each_reflog_ent(get_main_ref_store(the_repository), refname,
2154 fn, cb_data);
2155}
2156
2157int refs_reflog_exists(struct ref_store *refs, const char *refname)
2158{
2159 return refs->be->reflog_exists(refs, refname);
2160}
2161
2162int reflog_exists(const char *refname)
2163{
2164 return refs_reflog_exists(get_main_ref_store(the_repository), refname);
2165}
2166
2167int refs_create_reflog(struct ref_store *refs, const char *refname,
2168 int force_create, struct strbuf *err)
2169{
2170 return refs->be->create_reflog(refs, refname, force_create, err);
2171}
2172
2173int safe_create_reflog(const char *refname, int force_create,
2174 struct strbuf *err)
2175{
2176 return refs_create_reflog(get_main_ref_store(the_repository), refname,
2177 force_create, err);
2178}
2179
2180int refs_delete_reflog(struct ref_store *refs, const char *refname)
2181{
2182 return refs->be->delete_reflog(refs, refname);
2183}
2184
2185int delete_reflog(const char *refname)
2186{
2187 return refs_delete_reflog(get_main_ref_store(the_repository), refname);
2188}
2189
2190int refs_reflog_expire(struct ref_store *refs,
2191 const char *refname, const struct object_id *oid,
2192 unsigned int flags,
2193 reflog_expiry_prepare_fn prepare_fn,
2194 reflog_expiry_should_prune_fn should_prune_fn,
2195 reflog_expiry_cleanup_fn cleanup_fn,
2196 void *policy_cb_data)
2197{
2198 return refs->be->reflog_expire(refs, refname, oid, flags,
2199 prepare_fn, should_prune_fn,
2200 cleanup_fn, policy_cb_data);
2201}
2202
2203int reflog_expire(const char *refname, const struct object_id *oid,
2204 unsigned int flags,
2205 reflog_expiry_prepare_fn prepare_fn,
2206 reflog_expiry_should_prune_fn should_prune_fn,
2207 reflog_expiry_cleanup_fn cleanup_fn,
2208 void *policy_cb_data)
2209{
2210 return refs_reflog_expire(get_main_ref_store(the_repository),
2211 refname, oid, flags,
2212 prepare_fn, should_prune_fn,
2213 cleanup_fn, policy_cb_data);
2214}
2215
2216int initial_ref_transaction_commit(struct ref_transaction *transaction,
2217 struct strbuf *err)
2218{
2219 struct ref_store *refs = transaction->ref_store;
2220
2221 return refs->be->initial_transaction_commit(refs, transaction, err);
2222}
2223
2224int refs_delete_refs(struct ref_store *refs, const char *msg,
2225 struct string_list *refnames, unsigned int flags)
2226{
2227 return refs->be->delete_refs(refs, msg, refnames, flags);
2228}
2229
2230int delete_refs(const char *msg, struct string_list *refnames,
2231 unsigned int flags)
2232{
2233 return refs_delete_refs(get_main_ref_store(the_repository), msg, refnames, flags);
2234}
2235
2236int refs_rename_ref(struct ref_store *refs, const char *oldref,
2237 const char *newref, const char *logmsg)
2238{
2239 return refs->be->rename_ref(refs, oldref, newref, logmsg);
2240}
2241
2242int rename_ref(const char *oldref, const char *newref, const char *logmsg)
2243{
2244 return refs_rename_ref(get_main_ref_store(the_repository), oldref, newref, logmsg);
2245}
2246
2247int refs_copy_existing_ref(struct ref_store *refs, const char *oldref,
2248 const char *newref, const char *logmsg)
2249{
2250 return refs->be->copy_ref(refs, oldref, newref, logmsg);
2251}
2252
2253int copy_existing_ref(const char *oldref, const char *newref, const char *logmsg)
2254{
2255 return refs_copy_existing_ref(get_main_ref_store(the_repository), oldref, newref, logmsg);
2256}