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test-lib: set $TRASH_DIRECTORY earlier
[git.git] / remote.c
blobb850f2feb34d41ca8c23d237f0acc52896530daa
1 #include "cache.h"
2 #include "config.h"
3 #include "remote.h"
4 #include "refs.h"
5 #include "refspec.h"
6 #include "object-store.h"
7 #include "commit.h"
8 #include "diff.h"
9 #include "revision.h"
10 #include "dir.h"
11 #include "tag.h"
12 #include "string-list.h"
13 #include "mergesort.h"
14 #include "argv-array.h"
15 #include "commit-reach.h"
16
17 enum map_direction { FROM_SRC, FROM_DST };
18
19 struct counted_string {
20 size_t len;
21 const char *s;
22 };
23 struct rewrite {
24 const char *base;
25 size_t baselen;
26 struct counted_string *instead_of;
27 int instead_of_nr;
28 int instead_of_alloc;
29 };
30 struct rewrites {
31 struct rewrite **rewrite;
32 int rewrite_alloc;
33 int rewrite_nr;
34 };
35
36 static struct remote **remotes;
37 static int remotes_alloc;
38 static int remotes_nr;
39 static struct hashmap remotes_hash;
40
41 static struct branch **branches;
42 static int branches_alloc;
43 static int branches_nr;
44
45 static struct branch *current_branch;
46 static const char *pushremote_name;
47
48 static struct rewrites rewrites;
49 static struct rewrites rewrites_push;
50
51 static int valid_remote(const struct remote *remote)
52 {
53 return (!!remote->url) || (!!remote->foreign_vcs);
54 }
55
56 static const char *alias_url(const char *url, struct rewrites *r)
57 {
58 int i, j;
59 struct counted_string *longest;
60 int longest_i;
61
62 longest = NULL;
63 longest_i = -1;
64 for (i = 0; i < r->rewrite_nr; i++) {
65 if (!r->rewrite[i])
66 continue;
67 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
68 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
69 (!longest ||
70 longest->len < r->rewrite[i]->instead_of[j].len)) {
71 longest = &(r->rewrite[i]->instead_of[j]);
72 longest_i = i;
73 }
74 }
75 }
76 if (!longest)
77 return url;
78
79 return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
80 }
81
82 static void add_url(struct remote *remote, const char *url)
83 {
84 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
85 remote->url[remote->url_nr++] = url;
86 }
87
88 static void add_pushurl(struct remote *remote, const char *pushurl)
89 {
90 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
91 remote->pushurl[remote->pushurl_nr++] = pushurl;
92 }
93
94 static void add_pushurl_alias(struct remote *remote, const char *url)
95 {
96 const char *pushurl = alias_url(url, &rewrites_push);
97 if (pushurl != url)
98 add_pushurl(remote, pushurl);
99 }
100
101 static void add_url_alias(struct remote *remote, const char *url)
102 {
103 add_url(remote, alias_url(url, &rewrites));
104 add_pushurl_alias(remote, url);
105 }
106
107 struct remotes_hash_key {
108 const char *str;
109 int len;
110 };
111
112 static int remotes_hash_cmp(const void *unused_cmp_data,
113 const void *entry,
114 const void *entry_or_key,
115 const void *keydata)
116 {
117 const struct remote *a = entry;
118 const struct remote *b = entry_or_key;
119 const struct remotes_hash_key *key = keydata;
120
121 if (key)
122 return strncmp(a->name, key->str, key->len) || a->name[key->len];
123 else
124 return strcmp(a->name, b->name);
125 }
126
127 static inline void init_remotes_hash(void)
128 {
129 if (!remotes_hash.cmpfn)
130 hashmap_init(&remotes_hash, remotes_hash_cmp, NULL, 0);
131 }
132
133 static struct remote *make_remote(const char *name, int len)
134 {
135 struct remote *ret, *replaced;
136 struct remotes_hash_key lookup;
137 struct hashmap_entry lookup_entry;
138
139 if (!len)
140 len = strlen(name);
141
142 init_remotes_hash();
143 lookup.str = name;
144 lookup.len = len;
145 hashmap_entry_init(&lookup_entry, memhash(name, len));
146
147 if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
148 return ret;
149
150 ret = xcalloc(1, sizeof(struct remote));
151 ret->prune = -1; /* unspecified */
152 ret->prune_tags = -1; /* unspecified */
153 ret->name = xstrndup(name, len);
154 refspec_init(&ret->push, REFSPEC_PUSH);
155 refspec_init(&ret->fetch, REFSPEC_FETCH);
156
157 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
158 remotes[remotes_nr++] = ret;
159
160 hashmap_entry_init(ret, lookup_entry.hash);
161 replaced = hashmap_put(&remotes_hash, ret);
162 assert(replaced == NULL); /* no previous entry overwritten */
163 return ret;
164 }
165
166 static void add_merge(struct branch *branch, const char *name)
167 {
168 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
169 branch->merge_alloc);
170 branch->merge_name[branch->merge_nr++] = name;
171 }
172
173 static struct branch *make_branch(const char *name, int len)
174 {
175 struct branch *ret;
176 int i;
177
178 for (i = 0; i < branches_nr; i++) {
179 if (len ? (!strncmp(name, branches[i]->name, len) &&
180 !branches[i]->name[len]) :
181 !strcmp(name, branches[i]->name))
182 return branches[i];
183 }
184
185 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
186 ret = xcalloc(1, sizeof(struct branch));
187 branches[branches_nr++] = ret;
188 if (len)
189 ret->name = xstrndup(name, len);
190 else
191 ret->name = xstrdup(name);
192 ret->refname = xstrfmt("refs/heads/%s", ret->name);
193
194 return ret;
195 }
196
197 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
198 {
199 struct rewrite *ret;
200 int i;
201
202 for (i = 0; i < r->rewrite_nr; i++) {
203 if (len
204 ? (len == r->rewrite[i]->baselen &&
205 !strncmp(base, r->rewrite[i]->base, len))
206 : !strcmp(base, r->rewrite[i]->base))
207 return r->rewrite[i];
208 }
209
210 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
211 ret = xcalloc(1, sizeof(struct rewrite));
212 r->rewrite[r->rewrite_nr++] = ret;
213 if (len) {
214 ret->base = xstrndup(base, len);
215 ret->baselen = len;
216 }
217 else {
218 ret->base = xstrdup(base);
219 ret->baselen = strlen(base);
220 }
221 return ret;
222 }
223
224 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
225 {
226 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
227 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
228 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
229 rewrite->instead_of_nr++;
230 }
231
232 static const char *skip_spaces(const char *s)
233 {
234 while (isspace(*s))
235 s++;
236 return s;
237 }
238
239 static void read_remotes_file(struct remote *remote)
240 {
241 struct strbuf buf = STRBUF_INIT;
242 FILE *f = fopen_or_warn(git_path("remotes/%s", remote->name), "r");
243
244 if (!f)
245 return;
246 remote->configured_in_repo = 1;
247 remote->origin = REMOTE_REMOTES;
248 while (strbuf_getline(&buf, f) != EOF) {
249 const char *v;
250
251 strbuf_rtrim(&buf);
252
253 if (skip_prefix(buf.buf, "URL:", &v))
254 add_url_alias(remote, xstrdup(skip_spaces(v)));
255 else if (skip_prefix(buf.buf, "Push:", &v))
256 refspec_append(&remote->push, skip_spaces(v));
257 else if (skip_prefix(buf.buf, "Pull:", &v))
258 refspec_append(&remote->fetch, skip_spaces(v));
259 }
260 strbuf_release(&buf);
261 fclose(f);
262 }
263
264 static void read_branches_file(struct remote *remote)
265 {
266 char *frag;
267 struct strbuf buf = STRBUF_INIT;
268 FILE *f = fopen_or_warn(git_path("branches/%s", remote->name), "r");
269
270 if (!f)
271 return;
272
273 strbuf_getline_lf(&buf, f);
274 fclose(f);
275 strbuf_trim(&buf);
276 if (!buf.len) {
277 strbuf_release(&buf);
278 return;
279 }
280
281 remote->configured_in_repo = 1;
282 remote->origin = REMOTE_BRANCHES;
283
284 /*
285 * The branches file would have URL and optionally
286 * #branch specified. The "master" (or specified) branch is
287 * fetched and stored in the local branch matching the
288 * remote name.
289 */
290 frag = strchr(buf.buf, '#');
291 if (frag)
292 *(frag++) = '\0';
293 else
294 frag = "master";
295
296 add_url_alias(remote, strbuf_detach(&buf, NULL));
297 strbuf_addf(&buf, "refs/heads/%s:refs/heads/%s",
298 frag, remote->name);
299 refspec_append(&remote->fetch, buf.buf);
300
301 /*
302 * Cogito compatible push: push current HEAD to remote #branch
303 * (master if missing)
304 */
305 strbuf_reset(&buf);
306 strbuf_addf(&buf, "HEAD:refs/heads/%s", frag);
307 refspec_append(&remote->push, buf.buf);
308 remote->fetch_tags = 1; /* always auto-follow */
309 strbuf_release(&buf);
310 }
311
312 static int handle_config(const char *key, const char *value, void *cb)
313 {
314 const char *name;
315 int namelen;
316 const char *subkey;
317 struct remote *remote;
318 struct branch *branch;
319 if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
320 if (!name)
321 return 0;
322 branch = make_branch(name, namelen);
323 if (!strcmp(subkey, "remote")) {
324 return git_config_string(&branch->remote_name, key, value);
325 } else if (!strcmp(subkey, "pushremote")) {
326 return git_config_string(&branch->pushremote_name, key, value);
327 } else if (!strcmp(subkey, "merge")) {
328 if (!value)
329 return config_error_nonbool(key);
330 add_merge(branch, xstrdup(value));
331 }
332 return 0;
333 }
334 if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
335 struct rewrite *rewrite;
336 if (!name)
337 return 0;
338 if (!strcmp(subkey, "insteadof")) {
339 rewrite = make_rewrite(&rewrites, name, namelen);
340 if (!value)
341 return config_error_nonbool(key);
342 add_instead_of(rewrite, xstrdup(value));
343 } else if (!strcmp(subkey, "pushinsteadof")) {
344 rewrite = make_rewrite(&rewrites_push, name, namelen);
345 if (!value)
346 return config_error_nonbool(key);
347 add_instead_of(rewrite, xstrdup(value));
348 }
349 }
350
351 if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
352 return 0;
353
354 /* Handle remote.* variables */
355 if (!name && !strcmp(subkey, "pushdefault"))
356 return git_config_string(&pushremote_name, key, value);
357
358 if (!name)
359 return 0;
360 /* Handle remote.<name>.* variables */
361 if (*name == '/') {
362 warning("Config remote shorthand cannot begin with '/': %s",
363 name);
364 return 0;
365 }
366 remote = make_remote(name, namelen);
367 remote->origin = REMOTE_CONFIG;
368 if (current_config_scope() == CONFIG_SCOPE_REPO)
369 remote->configured_in_repo = 1;
370 if (!strcmp(subkey, "mirror"))
371 remote->mirror = git_config_bool(key, value);
372 else if (!strcmp(subkey, "skipdefaultupdate"))
373 remote->skip_default_update = git_config_bool(key, value);
374 else if (!strcmp(subkey, "skipfetchall"))
375 remote->skip_default_update = git_config_bool(key, value);
376 else if (!strcmp(subkey, "prune"))
377 remote->prune = git_config_bool(key, value);
378 else if (!strcmp(subkey, "prunetags"))
379 remote->prune_tags = git_config_bool(key, value);
380 else if (!strcmp(subkey, "url")) {
381 const char *v;
382 if (git_config_string(&v, key, value))
383 return -1;
384 add_url(remote, v);
385 } else if (!strcmp(subkey, "pushurl")) {
386 const char *v;
387 if (git_config_string(&v, key, value))
388 return -1;
389 add_pushurl(remote, v);
390 } else if (!strcmp(subkey, "push")) {
391 const char *v;
392 if (git_config_string(&v, key, value))
393 return -1;
394 refspec_append(&remote->push, v);
395 free((char *)v);
396 } else if (!strcmp(subkey, "fetch")) {
397 const char *v;
398 if (git_config_string(&v, key, value))
399 return -1;
400 refspec_append(&remote->fetch, v);
401 free((char *)v);
402 } else if (!strcmp(subkey, "receivepack")) {
403 const char *v;
404 if (git_config_string(&v, key, value))
405 return -1;
406 if (!remote->receivepack)
407 remote->receivepack = v;
408 else
409 error("more than one receivepack given, using the first");
410 } else if (!strcmp(subkey, "uploadpack")) {
411 const char *v;
412 if (git_config_string(&v, key, value))
413 return -1;
414 if (!remote->uploadpack)
415 remote->uploadpack = v;
416 else
417 error("more than one uploadpack given, using the first");
418 } else if (!strcmp(subkey, "tagopt")) {
419 if (!strcmp(value, "--no-tags"))
420 remote->fetch_tags = -1;
421 else if (!strcmp(value, "--tags"))
422 remote->fetch_tags = 2;
423 } else if (!strcmp(subkey, "proxy")) {
424 return git_config_string((const char **)&remote->http_proxy,
425 key, value);
426 } else if (!strcmp(subkey, "proxyauthmethod")) {
427 return git_config_string((const char **)&remote->http_proxy_authmethod,
428 key, value);
429 } else if (!strcmp(subkey, "vcs")) {
430 return git_config_string(&remote->foreign_vcs, key, value);
431 }
432 return 0;
433 }
434
435 static void alias_all_urls(void)
436 {
437 int i, j;
438 for (i = 0; i < remotes_nr; i++) {
439 int add_pushurl_aliases;
440 if (!remotes[i])
441 continue;
442 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
443 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
444 }
445 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
446 for (j = 0; j < remotes[i]->url_nr; j++) {
447 if (add_pushurl_aliases)
448 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
449 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
450 }
451 }
452 }
453
454 static void read_config(void)
455 {
456 static int loaded;
457 int flag;
458
459 if (loaded)
460 return;
461 loaded = 1;
462
463 current_branch = NULL;
464 if (startup_info->have_repository) {
465 const char *head_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flag);
466 if (head_ref && (flag & REF_ISSYMREF) &&
467 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
468 current_branch = make_branch(head_ref, 0);
469 }
470 }
471 git_config(handle_config, NULL);
472 alias_all_urls();
473 }
474
475 static int valid_remote_nick(const char *name)
476 {
477 if (!name[0] || is_dot_or_dotdot(name))
478 return 0;
479
480 /* remote nicknames cannot contain slashes */
481 while (*name)
482 if (is_dir_sep(*name++))
483 return 0;
484 return 1;
485 }
486
487 const char *remote_for_branch(struct branch *branch, int *explicit)
488 {
489 if (branch && branch->remote_name) {
490 if (explicit)
491 *explicit = 1;
492 return branch->remote_name;
493 }
494 if (explicit)
495 *explicit = 0;
496 return "origin";
497 }
498
499 const char *pushremote_for_branch(struct branch *branch, int *explicit)
500 {
501 if (branch && branch->pushremote_name) {
502 if (explicit)
503 *explicit = 1;
504 return branch->pushremote_name;
505 }
506 if (pushremote_name) {
507 if (explicit)
508 *explicit = 1;
509 return pushremote_name;
510 }
511 return remote_for_branch(branch, explicit);
512 }
513
514 const char *remote_ref_for_branch(struct branch *branch, int for_push,
515 int *explicit)
516 {
517 if (branch) {
518 if (!for_push) {
519 if (branch->merge_nr) {
520 if (explicit)
521 *explicit = 1;
522 return branch->merge_name[0];
523 }
524 } else {
525 const char *dst, *remote_name =
526 pushremote_for_branch(branch, NULL);
527 struct remote *remote = remote_get(remote_name);
528
529 if (remote && remote->push.nr &&
530 (dst = apply_refspecs(&remote->push,
531 branch->refname))) {
532 if (explicit)
533 *explicit = 1;
534 return dst;
535 }
536 }
537 }
538 if (explicit)
539 *explicit = 0;
540 return "";
541 }
542
543 static struct remote *remote_get_1(const char *name,
544 const char *(*get_default)(struct branch *, int *))
545 {
546 struct remote *ret;
547 int name_given = 0;
548
549 read_config();
550
551 if (name)
552 name_given = 1;
553 else
554 name = get_default(current_branch, &name_given);
555
556 ret = make_remote(name, 0);
557 if (valid_remote_nick(name) && have_git_dir()) {
558 if (!valid_remote(ret))
559 read_remotes_file(ret);
560 if (!valid_remote(ret))
561 read_branches_file(ret);
562 }
563 if (name_given && !valid_remote(ret))
564 add_url_alias(ret, name);
565 if (!valid_remote(ret))
566 return NULL;
567 return ret;
568 }
569
570 struct remote *remote_get(const char *name)
571 {
572 return remote_get_1(name, remote_for_branch);
573 }
574
575 struct remote *pushremote_get(const char *name)
576 {
577 return remote_get_1(name, pushremote_for_branch);
578 }
579
580 int remote_is_configured(struct remote *remote, int in_repo)
581 {
582 if (!remote)
583 return 0;
584 if (in_repo)
585 return remote->configured_in_repo;
586 return !!remote->origin;
587 }
588
589 int for_each_remote(each_remote_fn fn, void *priv)
590 {
591 int i, result = 0;
592 read_config();
593 for (i = 0; i < remotes_nr && !result; i++) {
594 struct remote *r = remotes[i];
595 if (!r)
596 continue;
597 result = fn(r, priv);
598 }
599 return result;
600 }
601
602 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
603 {
604 if (strcmp(ref1->name, ref2->name)) {
605 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
606 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
607 die(_("Cannot fetch both %s and %s to %s"),
608 ref1->name, ref2->name, ref2->peer_ref->name);
609 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
610 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
611 warning(_("%s usually tracks %s, not %s"),
612 ref2->peer_ref->name, ref2->name, ref1->name);
613 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
614 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
615 die(_("%s tracks both %s and %s"),
616 ref2->peer_ref->name, ref1->name, ref2->name);
617 } else {
618 /*
619 * This last possibility doesn't occur because
620 * FETCH_HEAD_IGNORE entries always appear at
621 * the end of the list.
622 */
623 die(_("Internal error"));
624 }
625 }
626 free(ref2->peer_ref);
627 free(ref2);
628 }
629
630 struct ref *ref_remove_duplicates(struct ref *ref_map)
631 {
632 struct string_list refs = STRING_LIST_INIT_NODUP;
633 struct ref *retval = NULL;
634 struct ref **p = &retval;
635
636 while (ref_map) {
637 struct ref *ref = ref_map;
638
639 ref_map = ref_map->next;
640 ref->next = NULL;
641
642 if (!ref->peer_ref) {
643 *p = ref;
644 p = &ref->next;
645 } else {
646 struct string_list_item *item =
647 string_list_insert(&refs, ref->peer_ref->name);
648
649 if (item->util) {
650 /* Entry already existed */
651 handle_duplicate((struct ref *)item->util, ref);
652 } else {
653 *p = ref;
654 p = &ref->next;
655 item->util = ref;
656 }
657 }
658 }
659
660 string_list_clear(&refs, 0);
661 return retval;
662 }
663
664 int remote_has_url(struct remote *remote, const char *url)
665 {
666 int i;
667 for (i = 0; i < remote->url_nr; i++) {
668 if (!strcmp(remote->url[i], url))
669 return 1;
670 }
671 return 0;
672 }
673
674 static int match_name_with_pattern(const char *key, const char *name,
675 const char *value, char **result)
676 {
677 const char *kstar = strchr(key, '*');
678 size_t klen;
679 size_t ksuffixlen;
680 size_t namelen;
681 int ret;
682 if (!kstar)
683 die("Key '%s' of pattern had no '*'", key);
684 klen = kstar - key;
685 ksuffixlen = strlen(kstar + 1);
686 namelen = strlen(name);
687 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
688 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
689 if (ret && value) {
690 struct strbuf sb = STRBUF_INIT;
691 const char *vstar = strchr(value, '*');
692 if (!vstar)
693 die("Value '%s' of pattern has no '*'", value);
694 strbuf_add(&sb, value, vstar - value);
695 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
696 strbuf_addstr(&sb, vstar + 1);
697 *result = strbuf_detach(&sb, NULL);
698 }
699 return ret;
700 }
701
702 static void query_refspecs_multiple(struct refspec *rs,
703 struct refspec_item *query,
704 struct string_list *results)
705 {
706 int i;
707 int find_src = !query->src;
708
709 if (find_src && !query->dst)
710 error("query_refspecs_multiple: need either src or dst");
711
712 for (i = 0; i < rs->nr; i++) {
713 struct refspec_item *refspec = &rs->items[i];
714 const char *key = find_src ? refspec->dst : refspec->src;
715 const char *value = find_src ? refspec->src : refspec->dst;
716 const char *needle = find_src ? query->dst : query->src;
717 char **result = find_src ? &query->src : &query->dst;
718
719 if (!refspec->dst)
720 continue;
721 if (refspec->pattern) {
722 if (match_name_with_pattern(key, needle, value, result))
723 string_list_append_nodup(results, *result);
724 } else if (!strcmp(needle, key)) {
725 string_list_append(results, value);
726 }
727 }
728 }
729
730 int query_refspecs(struct refspec *rs, struct refspec_item *query)
731 {
732 int i;
733 int find_src = !query->src;
734 const char *needle = find_src ? query->dst : query->src;
735 char **result = find_src ? &query->src : &query->dst;
736
737 if (find_src && !query->dst)
738 return error("query_refspecs: need either src or dst");
739
740 for (i = 0; i < rs->nr; i++) {
741 struct refspec_item *refspec = &rs->items[i];
742 const char *key = find_src ? refspec->dst : refspec->src;
743 const char *value = find_src ? refspec->src : refspec->dst;
744
745 if (!refspec->dst)
746 continue;
747 if (refspec->pattern) {
748 if (match_name_with_pattern(key, needle, value, result)) {
749 query->force = refspec->force;
750 return 0;
751 }
752 } else if (!strcmp(needle, key)) {
753 *result = xstrdup(value);
754 query->force = refspec->force;
755 return 0;
756 }
757 }
758 return -1;
759 }
760
761 char *apply_refspecs(struct refspec *rs, const char *name)
762 {
763 struct refspec_item query;
764
765 memset(&query, 0, sizeof(struct refspec_item));
766 query.src = (char *)name;
767
768 if (query_refspecs(rs, &query))
769 return NULL;
770
771 return query.dst;
772 }
773
774 int remote_find_tracking(struct remote *remote, struct refspec_item *refspec)
775 {
776 return query_refspecs(&remote->fetch, refspec);
777 }
778
779 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
780 const char *name)
781 {
782 size_t len = strlen(name);
783 struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
784 memcpy(ref->name, prefix, prefixlen);
785 memcpy(ref->name + prefixlen, name, len);
786 return ref;
787 }
788
789 struct ref *alloc_ref(const char *name)
790 {
791 return alloc_ref_with_prefix("", 0, name);
792 }
793
794 struct ref *copy_ref(const struct ref *ref)
795 {
796 struct ref *cpy;
797 size_t len;
798 if (!ref)
799 return NULL;
800 len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
801 cpy = xmalloc(len);
802 memcpy(cpy, ref, len);
803 cpy->next = NULL;
804 cpy->symref = xstrdup_or_null(ref->symref);
805 cpy->remote_status = xstrdup_or_null(ref->remote_status);
806 cpy->peer_ref = copy_ref(ref->peer_ref);
807 return cpy;
808 }
809
810 struct ref *copy_ref_list(const struct ref *ref)
811 {
812 struct ref *ret = NULL;
813 struct ref **tail = &ret;
814 while (ref) {
815 *tail = copy_ref(ref);
816 ref = ref->next;
817 tail = &((*tail)->next);
818 }
819 return ret;
820 }
821
822 static void free_ref(struct ref *ref)
823 {
824 if (!ref)
825 return;
826 free_ref(ref->peer_ref);
827 free(ref->remote_status);
828 free(ref->symref);
829 free(ref);
830 }
831
832 void free_refs(struct ref *ref)
833 {
834 struct ref *next;
835 while (ref) {
836 next = ref->next;
837 free_ref(ref);
838 ref = next;
839 }
840 }
841
842 int ref_compare_name(const void *va, const void *vb)
843 {
844 const struct ref *a = va, *b = vb;
845 return strcmp(a->name, b->name);
846 }
847
848 static void *ref_list_get_next(const void *a)
849 {
850 return ((const struct ref *)a)->next;
851 }
852
853 static void ref_list_set_next(void *a, void *next)
854 {
855 ((struct ref *)a)->next = next;
856 }
857
858 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
859 {
860 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
861 }
862
863 int count_refspec_match(const char *pattern,
864 struct ref *refs,
865 struct ref **matched_ref)
866 {
867 int patlen = strlen(pattern);
868 struct ref *matched_weak = NULL;
869 struct ref *matched = NULL;
870 int weak_match = 0;
871 int match = 0;
872
873 for (weak_match = match = 0; refs; refs = refs->next) {
874 char *name = refs->name;
875 int namelen = strlen(name);
876
877 if (!refname_match(pattern, name))
878 continue;
879
880 /* A match is "weak" if it is with refs outside
881 * heads or tags, and did not specify the pattern
882 * in full (e.g. "refs/remotes/origin/master") or at
883 * least from the toplevel (e.g. "remotes/origin/master");
884 * otherwise "git push $URL master" would result in
885 * ambiguity between remotes/origin/master and heads/master
886 * at the remote site.
887 */
888 if (namelen != patlen &&
889 patlen != namelen - 5 &&
890 !starts_with(name, "refs/heads/") &&
891 !starts_with(name, "refs/tags/")) {
892 /* We want to catch the case where only weak
893 * matches are found and there are multiple
894 * matches, and where more than one strong
895 * matches are found, as ambiguous. One
896 * strong match with zero or more weak matches
897 * are acceptable as a unique match.
898 */
899 matched_weak = refs;
900 weak_match++;
901 }
902 else {
903 matched = refs;
904 match++;
905 }
906 }
907 if (!matched) {
908 if (matched_ref)
909 *matched_ref = matched_weak;
910 return weak_match;
911 }
912 else {
913 if (matched_ref)
914 *matched_ref = matched;
915 return match;
916 }
917 }
918
919 static void tail_link_ref(struct ref *ref, struct ref ***tail)
920 {
921 **tail = ref;
922 while (ref->next)
923 ref = ref->next;
924 *tail = &ref->next;
925 }
926
927 static struct ref *alloc_delete_ref(void)
928 {
929 struct ref *ref = alloc_ref("(delete)");
930 oidclr(&ref->new_oid);
931 return ref;
932 }
933
934 static int try_explicit_object_name(const char *name,
935 struct ref **match)
936 {
937 struct object_id oid;
938
939 if (!*name) {
940 if (match)
941 *match = alloc_delete_ref();
942 return 0;
943 }
944
945 if (get_oid(name, &oid))
946 return -1;
947
948 if (match) {
949 *match = alloc_ref(name);
950 oidcpy(&(*match)->new_oid, &oid);
951 }
952 return 0;
953 }
954
955 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
956 {
957 struct ref *ret = alloc_ref(name);
958 tail_link_ref(ret, tail);
959 return ret;
960 }
961
962 static char *guess_ref(const char *name, struct ref *peer)
963 {
964 struct strbuf buf = STRBUF_INIT;
965
966 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
967 NULL, NULL);
968 if (!r)
969 return NULL;
970
971 if (starts_with(r, "refs/heads/"))
972 strbuf_addstr(&buf, "refs/heads/");
973 else if (starts_with(r, "refs/tags/"))
974 strbuf_addstr(&buf, "refs/tags/");
975 else
976 return NULL;
977
978 strbuf_addstr(&buf, name);
979 return strbuf_detach(&buf, NULL);
980 }
981
982 static int match_explicit_lhs(struct ref *src,
983 struct refspec_item *rs,
984 struct ref **match,
985 int *allocated_match)
986 {
987 switch (count_refspec_match(rs->src, src, match)) {
988 case 1:
989 if (allocated_match)
990 *allocated_match = 0;
991 return 0;
992 case 0:
993 /* The source could be in the get_sha1() format
994 * not a reference name. :refs/other is a
995 * way to delete 'other' ref at the remote end.
996 */
997 if (try_explicit_object_name(rs->src, match) < 0)
998 return error("src refspec %s does not match any.", rs->src);
999 if (allocated_match)
1000 *allocated_match = 1;
1001 return 0;
1002 default:
1003 return error("src refspec %s matches more than one.", rs->src);
1004 }
1005 }
1006
1007 static int match_explicit(struct ref *src, struct ref *dst,
1008 struct ref ***dst_tail,
1009 struct refspec_item *rs)
1010 {
1011 struct ref *matched_src, *matched_dst;
1012 int allocated_src;
1013
1014 const char *dst_value = rs->dst;
1015 char *dst_guess;
1016
1017 if (rs->pattern || rs->matching)
1018 return 0;
1019
1020 matched_src = matched_dst = NULL;
1021 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1022 return -1;
1023
1024 if (!dst_value) {
1025 int flag;
1026
1027 dst_value = resolve_ref_unsafe(matched_src->name,
1028 RESOLVE_REF_READING,
1029 NULL, &flag);
1030 if (!dst_value ||
1031 ((flag & REF_ISSYMREF) &&
1032 !starts_with(dst_value, "refs/heads/")))
1033 die("%s cannot be resolved to branch.",
1034 matched_src->name);
1035 }
1036
1037 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1038 case 1:
1039 break;
1040 case 0:
1041 if (starts_with(dst_value, "refs/"))
1042 matched_dst = make_linked_ref(dst_value, dst_tail);
1043 else if (is_null_oid(&matched_src->new_oid))
1044 error("unable to delete '%s': remote ref does not exist",
1045 dst_value);
1046 else if ((dst_guess = guess_ref(dst_value, matched_src))) {
1047 matched_dst = make_linked_ref(dst_guess, dst_tail);
1048 free(dst_guess);
1049 } else
1050 error("unable to push to unqualified destination: %s\n"
1051 "The destination refspec neither matches an "
1052 "existing ref on the remote nor\n"
1053 "begins with refs/, and we are unable to "
1054 "guess a prefix based on the source ref.",
1055 dst_value);
1056 break;
1057 default:
1058 matched_dst = NULL;
1059 error("dst refspec %s matches more than one.",
1060 dst_value);
1061 break;
1062 }
1063 if (!matched_dst)
1064 return -1;
1065 if (matched_dst->peer_ref)
1066 return error("dst ref %s receives from more than one src.",
1067 matched_dst->name);
1068 else {
1069 matched_dst->peer_ref = allocated_src ?
1070 matched_src :
1071 copy_ref(matched_src);
1072 matched_dst->force = rs->force;
1073 }
1074 return 0;
1075 }
1076
1077 static int match_explicit_refs(struct ref *src, struct ref *dst,
1078 struct ref ***dst_tail, struct refspec *rs)
1079 {
1080 int i, errs;
1081 for (i = errs = 0; i < rs->nr; i++)
1082 errs += match_explicit(src, dst, dst_tail, &rs->items[i]);
1083 return errs;
1084 }
1085
1086 static char *get_ref_match(const struct refspec *rs, const struct ref *ref,
1087 int send_mirror, int direction,
1088 const struct refspec_item **ret_pat)
1089 {
1090 const struct refspec_item *pat;
1091 char *name;
1092 int i;
1093 int matching_refs = -1;
1094 for (i = 0; i < rs->nr; i++) {
1095 const struct refspec_item *item = &rs->items[i];
1096 if (item->matching &&
1097 (matching_refs == -1 || item->force)) {
1098 matching_refs = i;
1099 continue;
1100 }
1101
1102 if (item->pattern) {
1103 const char *dst_side = item->dst ? item->dst : item->src;
1104 int match;
1105 if (direction == FROM_SRC)
1106 match = match_name_with_pattern(item->src, ref->name, dst_side, &name);
1107 else
1108 match = match_name_with_pattern(dst_side, ref->name, item->src, &name);
1109 if (match) {
1110 matching_refs = i;
1111 break;
1112 }
1113 }
1114 }
1115 if (matching_refs == -1)
1116 return NULL;
1117
1118 pat = &rs->items[matching_refs];
1119 if (pat->matching) {
1120 /*
1121 * "matching refs"; traditionally we pushed everything
1122 * including refs outside refs/heads/ hierarchy, but
1123 * that does not make much sense these days.
1124 */
1125 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1126 return NULL;
1127 name = xstrdup(ref->name);
1128 }
1129 if (ret_pat)
1130 *ret_pat = pat;
1131 return name;
1132 }
1133
1134 static struct ref **tail_ref(struct ref **head)
1135 {
1136 struct ref **tail = head;
1137 while (*tail)
1138 tail = &((*tail)->next);
1139 return tail;
1140 }
1141
1142 struct tips {
1143 struct commit **tip;
1144 int nr, alloc;
1145 };
1146
1147 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1148 {
1149 struct commit *commit;
1150
1151 if (is_null_oid(oid))
1152 return;
1153 commit = lookup_commit_reference_gently(the_repository, oid, 1);
1154 if (!commit || (commit->object.flags & TMP_MARK))
1155 return;
1156 commit->object.flags |= TMP_MARK;
1157 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1158 tips->tip[tips->nr++] = commit;
1159 }
1160
1161 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1162 {
1163 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1164 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1165 struct string_list_item *item;
1166 struct ref *ref;
1167 struct tips sent_tips;
1168
1169 /*
1170 * Collect everything we know they would have at the end of
1171 * this push, and collect all tags they have.
1172 */
1173 memset(&sent_tips, 0, sizeof(sent_tips));
1174 for (ref = *dst; ref; ref = ref->next) {
1175 if (ref->peer_ref &&
1176 !is_null_oid(&ref->peer_ref->new_oid))
1177 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1178 else
1179 add_to_tips(&sent_tips, &ref->old_oid);
1180 if (starts_with(ref->name, "refs/tags/"))
1181 string_list_append(&dst_tag, ref->name);
1182 }
1183 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1184
1185 string_list_sort(&dst_tag);
1186
1187 /* Collect tags they do not have. */
1188 for (ref = src; ref; ref = ref->next) {
1189 if (!starts_with(ref->name, "refs/tags/"))
1190 continue; /* not a tag */
1191 if (string_list_has_string(&dst_tag, ref->name))
1192 continue; /* they already have it */
1193 if (oid_object_info(the_repository, &ref->new_oid, NULL) != OBJ_TAG)
1194 continue; /* be conservative */
1195 item = string_list_append(&src_tag, ref->name);
1196 item->util = ref;
1197 }
1198 string_list_clear(&dst_tag, 0);
1199
1200 /*
1201 * At this point, src_tag lists tags that are missing from
1202 * dst, and sent_tips lists the tips we are pushing or those
1203 * that we know they already have. An element in the src_tag
1204 * that is an ancestor of any of the sent_tips needs to be
1205 * sent to the other side.
1206 */
1207 if (sent_tips.nr) {
1208 const int reachable_flag = 1;
1209 struct commit_list *found_commits;
1210 struct commit **src_commits;
1211 int nr_src_commits = 0, alloc_src_commits = 16;
1212 ALLOC_ARRAY(src_commits, alloc_src_commits);
1213
1214 for_each_string_list_item(item, &src_tag) {
1215 struct ref *ref = item->util;
1216 struct commit *commit;
1217
1218 if (is_null_oid(&ref->new_oid))
1219 continue;
1220 commit = lookup_commit_reference_gently(the_repository,
1221 &ref->new_oid,
1222 1);
1223 if (!commit)
1224 /* not pushing a commit, which is not an error */
1225 continue;
1226
1227 ALLOC_GROW(src_commits, nr_src_commits + 1, alloc_src_commits);
1228 src_commits[nr_src_commits++] = commit;
1229 }
1230
1231 found_commits = get_reachable_subset(sent_tips.tip, sent_tips.nr,
1232 src_commits, nr_src_commits,
1233 reachable_flag);
1234
1235 for_each_string_list_item(item, &src_tag) {
1236 struct ref *dst_ref;
1237 struct ref *ref = item->util;
1238 struct commit *commit;
1239
1240 if (is_null_oid(&ref->new_oid))
1241 continue;
1242 commit = lookup_commit_reference_gently(the_repository,
1243 &ref->new_oid,
1244 1);
1245 if (!commit)
1246 /* not pushing a commit, which is not an error */
1247 continue;
1248
1249 /*
1250 * Is this tag, which they do not have, reachable from
1251 * any of the commits we are sending?
1252 */
1253 if (!(commit->object.flags & reachable_flag))
1254 continue;
1255
1256 /* Add it in */
1257 dst_ref = make_linked_ref(ref->name, dst_tail);
1258 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1259 dst_ref->peer_ref = copy_ref(ref);
1260 }
1261
1262 clear_commit_marks_many(nr_src_commits, src_commits, reachable_flag);
1263 free(src_commits);
1264 free_commit_list(found_commits);
1265 }
1266
1267 string_list_clear(&src_tag, 0);
1268 free(sent_tips.tip);
1269 }
1270
1271 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1272 {
1273 for ( ; list; list = list->next)
1274 if (!strcmp(list->name, name))
1275 return (struct ref *)list;
1276 return NULL;
1277 }
1278
1279 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1280 {
1281 for ( ; ref; ref = ref->next)
1282 string_list_append_nodup(ref_index, ref->name)->util = ref;
1283
1284 string_list_sort(ref_index);
1285 }
1286
1287 /*
1288 * Given only the set of local refs, sanity-check the set of push
1289 * refspecs. We can't catch all errors that match_push_refs would,
1290 * but we can catch some errors early before even talking to the
1291 * remote side.
1292 */
1293 int check_push_refs(struct ref *src, struct refspec *rs)
1294 {
1295 int ret = 0;
1296 int i;
1297
1298 for (i = 0; i < rs->nr; i++) {
1299 struct refspec_item *item = &rs->items[i];
1300
1301 if (item->pattern || item->matching)
1302 continue;
1303
1304 ret |= match_explicit_lhs(src, item, NULL, NULL);
1305 }
1306
1307 return ret;
1308 }
1309
1310 /*
1311 * Given the set of refs the local repository has, the set of refs the
1312 * remote repository has, and the refspec used for push, determine
1313 * what remote refs we will update and with what value by setting
1314 * peer_ref (which object is being pushed) and force (if the push is
1315 * forced) in elements of "dst". The function may add new elements to
1316 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1317 */
1318 int match_push_refs(struct ref *src, struct ref **dst,
1319 struct refspec *rs, int flags)
1320 {
1321 int send_all = flags & MATCH_REFS_ALL;
1322 int send_mirror = flags & MATCH_REFS_MIRROR;
1323 int send_prune = flags & MATCH_REFS_PRUNE;
1324 int errs;
1325 struct ref *ref, **dst_tail = tail_ref(dst);
1326 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1327
1328 /* If no refspec is provided, use the default ":" */
1329 if (!rs->nr)
1330 refspec_append(rs, ":");
1331
1332 errs = match_explicit_refs(src, *dst, &dst_tail, rs);
1333
1334 /* pick the remainder */
1335 for (ref = src; ref; ref = ref->next) {
1336 struct string_list_item *dst_item;
1337 struct ref *dst_peer;
1338 const struct refspec_item *pat = NULL;
1339 char *dst_name;
1340
1341 dst_name = get_ref_match(rs, ref, send_mirror, FROM_SRC, &pat);
1342 if (!dst_name)
1343 continue;
1344
1345 if (!dst_ref_index.nr)
1346 prepare_ref_index(&dst_ref_index, *dst);
1347
1348 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1349 dst_peer = dst_item ? dst_item->util : NULL;
1350 if (dst_peer) {
1351 if (dst_peer->peer_ref)
1352 /* We're already sending something to this ref. */
1353 goto free_name;
1354 } else {
1355 if (pat->matching && !(send_all || send_mirror))
1356 /*
1357 * Remote doesn't have it, and we have no
1358 * explicit pattern, and we don't have
1359 * --all or --mirror.
1360 */
1361 goto free_name;
1362
1363 /* Create a new one and link it */
1364 dst_peer = make_linked_ref(dst_name, &dst_tail);
1365 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1366 string_list_insert(&dst_ref_index,
1367 dst_peer->name)->util = dst_peer;
1368 }
1369 dst_peer->peer_ref = copy_ref(ref);
1370 dst_peer->force = pat->force;
1371 free_name:
1372 free(dst_name);
1373 }
1374
1375 string_list_clear(&dst_ref_index, 0);
1376
1377 if (flags & MATCH_REFS_FOLLOW_TAGS)
1378 add_missing_tags(src, dst, &dst_tail);
1379
1380 if (send_prune) {
1381 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1382 /* check for missing refs on the remote */
1383 for (ref = *dst; ref; ref = ref->next) {
1384 char *src_name;
1385
1386 if (ref->peer_ref)
1387 /* We're already sending something to this ref. */
1388 continue;
1389
1390 src_name = get_ref_match(rs, ref, send_mirror, FROM_DST, NULL);
1391 if (src_name) {
1392 if (!src_ref_index.nr)
1393 prepare_ref_index(&src_ref_index, src);
1394 if (!string_list_has_string(&src_ref_index,
1395 src_name))
1396 ref->peer_ref = alloc_delete_ref();
1397 free(src_name);
1398 }
1399 }
1400 string_list_clear(&src_ref_index, 0);
1401 }
1402
1403 if (errs)
1404 return -1;
1405 return 0;
1406 }
1407
1408 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1409 int force_update)
1410 {
1411 struct ref *ref;
1412
1413 for (ref = remote_refs; ref; ref = ref->next) {
1414 int force_ref_update = ref->force || force_update;
1415 int reject_reason = 0;
1416
1417 if (ref->peer_ref)
1418 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1419 else if (!send_mirror)
1420 continue;
1421
1422 ref->deletion = is_null_oid(&ref->new_oid);
1423 if (!ref->deletion &&
1424 oideq(&ref->old_oid, &ref->new_oid)) {
1425 ref->status = REF_STATUS_UPTODATE;
1426 continue;
1427 }
1428
1429 /*
1430 * If the remote ref has moved and is now different
1431 * from what we expect, reject any push.
1432 *
1433 * It also is an error if the user told us to check
1434 * with the remote-tracking branch to find the value
1435 * to expect, but we did not have such a tracking
1436 * branch.
1437 */
1438 if (ref->expect_old_sha1) {
1439 if (!oideq(&ref->old_oid, &ref->old_oid_expect))
1440 reject_reason = REF_STATUS_REJECT_STALE;
1441 else
1442 /* If the ref isn't stale then force the update. */
1443 force_ref_update = 1;
1444 }
1445
1446 /*
1447 * If the update isn't already rejected then check
1448 * the usual "must fast-forward" rules.
1449 *
1450 * Decide whether an individual refspec A:B can be
1451 * pushed. The push will succeed if any of the
1452 * following are true:
1453 *
1454 * (1) the remote reference B does not exist
1455 *
1456 * (2) the remote reference B is being removed (i.e.,
1457 * pushing :B where no source is specified)
1458 *
1459 * (3) the destination is not under refs/tags/, and
1460 * if the old and new value is a commit, the new
1461 * is a descendant of the old.
1462 *
1463 * (4) it is forced using the +A:B notation, or by
1464 * passing the --force argument
1465 */
1466
1467 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1468 if (starts_with(ref->name, "refs/tags/"))
1469 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1470 else if (!has_object_file(&ref->old_oid))
1471 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1472 else if (!lookup_commit_reference_gently(the_repository, &ref->old_oid, 1) ||
1473 !lookup_commit_reference_gently(the_repository, &ref->new_oid, 1))
1474 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1475 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1476 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1477 }
1478
1479 /*
1480 * "--force" will defeat any rejection implemented
1481 * by the rules above.
1482 */
1483 if (!force_ref_update)
1484 ref->status = reject_reason;
1485 else if (reject_reason)
1486 ref->forced_update = 1;
1487 }
1488 }
1489
1490 static void set_merge(struct branch *ret)
1491 {
1492 struct remote *remote;
1493 char *ref;
1494 struct object_id oid;
1495 int i;
1496
1497 if (!ret)
1498 return; /* no branch */
1499 if (ret->merge)
1500 return; /* already run */
1501 if (!ret->remote_name || !ret->merge_nr) {
1502 /*
1503 * no merge config; let's make sure we don't confuse callers
1504 * with a non-zero merge_nr but a NULL merge
1505 */
1506 ret->merge_nr = 0;
1507 return;
1508 }
1509
1510 remote = remote_get(ret->remote_name);
1511
1512 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1513 for (i = 0; i < ret->merge_nr; i++) {
1514 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1515 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1516 if (!remote_find_tracking(remote, ret->merge[i]) ||
1517 strcmp(ret->remote_name, "."))
1518 continue;
1519 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1520 &oid, &ref) == 1)
1521 ret->merge[i]->dst = ref;
1522 else
1523 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1524 }
1525 }
1526
1527 struct branch *branch_get(const char *name)
1528 {
1529 struct branch *ret;
1530
1531 read_config();
1532 if (!name || !*name || !strcmp(name, "HEAD"))
1533 ret = current_branch;
1534 else
1535 ret = make_branch(name, 0);
1536 set_merge(ret);
1537 return ret;
1538 }
1539
1540 int branch_has_merge_config(struct branch *branch)
1541 {
1542 return branch && !!branch->merge;
1543 }
1544
1545 int branch_merge_matches(struct branch *branch,
1546 int i,
1547 const char *refname)
1548 {
1549 if (!branch || i < 0 || i >= branch->merge_nr)
1550 return 0;
1551 return refname_match(branch->merge[i]->src, refname);
1552 }
1553
1554 __attribute__((format (printf,2,3)))
1555 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1556 {
1557 if (err) {
1558 va_list ap;
1559 va_start(ap, fmt);
1560 strbuf_vaddf(err, fmt, ap);
1561 va_end(ap);
1562 }
1563 return NULL;
1564 }
1565
1566 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1567 {
1568 if (!branch)
1569 return error_buf(err, _("HEAD does not point to a branch"));
1570
1571 if (!branch->merge || !branch->merge[0]) {
1572 /*
1573 * no merge config; is it because the user didn't define any,
1574 * or because it is not a real branch, and get_branch
1575 * auto-vivified it?
1576 */
1577 if (!ref_exists(branch->refname))
1578 return error_buf(err, _("no such branch: '%s'"),
1579 branch->name);
1580 return error_buf(err,
1581 _("no upstream configured for branch '%s'"),
1582 branch->name);
1583 }
1584
1585 if (!branch->merge[0]->dst)
1586 return error_buf(err,
1587 _("upstream branch '%s' not stored as a remote-tracking branch"),
1588 branch->merge[0]->src);
1589
1590 return branch->merge[0]->dst;
1591 }
1592
1593 static const char *tracking_for_push_dest(struct remote *remote,
1594 const char *refname,
1595 struct strbuf *err)
1596 {
1597 char *ret;
1598
1599 ret = apply_refspecs(&remote->fetch, refname);
1600 if (!ret)
1601 return error_buf(err,
1602 _("push destination '%s' on remote '%s' has no local tracking branch"),
1603 refname, remote->name);
1604 return ret;
1605 }
1606
1607 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1608 {
1609 struct remote *remote;
1610
1611 remote = remote_get(pushremote_for_branch(branch, NULL));
1612 if (!remote)
1613 return error_buf(err,
1614 _("branch '%s' has no remote for pushing"),
1615 branch->name);
1616
1617 if (remote->push.nr) {
1618 char *dst;
1619 const char *ret;
1620
1621 dst = apply_refspecs(&remote->push, branch->refname);
1622 if (!dst)
1623 return error_buf(err,
1624 _("push refspecs for '%s' do not include '%s'"),
1625 remote->name, branch->name);
1626
1627 ret = tracking_for_push_dest(remote, dst, err);
1628 free(dst);
1629 return ret;
1630 }
1631
1632 if (remote->mirror)
1633 return tracking_for_push_dest(remote, branch->refname, err);
1634
1635 switch (push_default) {
1636 case PUSH_DEFAULT_NOTHING:
1637 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1638
1639 case PUSH_DEFAULT_MATCHING:
1640 case PUSH_DEFAULT_CURRENT:
1641 return tracking_for_push_dest(remote, branch->refname, err);
1642
1643 case PUSH_DEFAULT_UPSTREAM:
1644 return branch_get_upstream(branch, err);
1645
1646 case PUSH_DEFAULT_UNSPECIFIED:
1647 case PUSH_DEFAULT_SIMPLE:
1648 {
1649 const char *up, *cur;
1650
1651 up = branch_get_upstream(branch, err);
1652 if (!up)
1653 return NULL;
1654 cur = tracking_for_push_dest(remote, branch->refname, err);
1655 if (!cur)
1656 return NULL;
1657 if (strcmp(cur, up))
1658 return error_buf(err,
1659 _("cannot resolve 'simple' push to a single destination"));
1660 return cur;
1661 }
1662 }
1663
1664 BUG("unhandled push situation");
1665 }
1666
1667 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1668 {
1669 if (!branch)
1670 return error_buf(err, _("HEAD does not point to a branch"));
1671
1672 if (!branch->push_tracking_ref)
1673 branch->push_tracking_ref = branch_get_push_1(branch, err);
1674 return branch->push_tracking_ref;
1675 }
1676
1677 static int ignore_symref_update(const char *refname)
1678 {
1679 int flag;
1680
1681 if (!resolve_ref_unsafe(refname, 0, NULL, &flag))
1682 return 0; /* non-existing refs are OK */
1683 return (flag & REF_ISSYMREF);
1684 }
1685
1686 /*
1687 * Create and return a list of (struct ref) consisting of copies of
1688 * each remote_ref that matches refspec. refspec must be a pattern.
1689 * Fill in the copies' peer_ref to describe the local tracking refs to
1690 * which they map. Omit any references that would map to an existing
1691 * local symbolic ref.
1692 */
1693 static struct ref *get_expanded_map(const struct ref *remote_refs,
1694 const struct refspec_item *refspec)
1695 {
1696 const struct ref *ref;
1697 struct ref *ret = NULL;
1698 struct ref **tail = &ret;
1699
1700 for (ref = remote_refs; ref; ref = ref->next) {
1701 char *expn_name = NULL;
1702
1703 if (strchr(ref->name, '^'))
1704 continue; /* a dereference item */
1705 if (match_name_with_pattern(refspec->src, ref->name,
1706 refspec->dst, &expn_name) &&
1707 !ignore_symref_update(expn_name)) {
1708 struct ref *cpy = copy_ref(ref);
1709
1710 cpy->peer_ref = alloc_ref(expn_name);
1711 if (refspec->force)
1712 cpy->peer_ref->force = 1;
1713 *tail = cpy;
1714 tail = &cpy->next;
1715 }
1716 free(expn_name);
1717 }
1718
1719 return ret;
1720 }
1721
1722 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1723 {
1724 const struct ref *ref;
1725 const struct ref *best_match = NULL;
1726 int best_score = 0;
1727
1728 for (ref = refs; ref; ref = ref->next) {
1729 int score = refname_match(name, ref->name);
1730
1731 if (best_score < score) {
1732 best_match = ref;
1733 best_score = score;
1734 }
1735 }
1736 return best_match;
1737 }
1738
1739 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1740 {
1741 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1742
1743 if (!ref)
1744 return NULL;
1745
1746 return copy_ref(ref);
1747 }
1748
1749 static struct ref *get_local_ref(const char *name)
1750 {
1751 if (!name || name[0] == '\0')
1752 return NULL;
1753
1754 if (starts_with(name, "refs/"))
1755 return alloc_ref(name);
1756
1757 if (starts_with(name, "heads/") ||
1758 starts_with(name, "tags/") ||
1759 starts_with(name, "remotes/"))
1760 return alloc_ref_with_prefix("refs/", 5, name);
1761
1762 return alloc_ref_with_prefix("refs/heads/", 11, name);
1763 }
1764
1765 int get_fetch_map(const struct ref *remote_refs,
1766 const struct refspec_item *refspec,
1767 struct ref ***tail,
1768 int missing_ok)
1769 {
1770 struct ref *ref_map, **rmp;
1771
1772 if (refspec->pattern) {
1773 ref_map = get_expanded_map(remote_refs, refspec);
1774 } else {
1775 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1776
1777 if (refspec->exact_sha1) {
1778 ref_map = alloc_ref(name);
1779 get_oid_hex(name, &ref_map->old_oid);
1780 ref_map->exact_oid = 1;
1781 } else {
1782 ref_map = get_remote_ref(remote_refs, name);
1783 }
1784 if (!missing_ok && !ref_map)
1785 die("Couldn't find remote ref %s", name);
1786 if (ref_map) {
1787 ref_map->peer_ref = get_local_ref(refspec->dst);
1788 if (ref_map->peer_ref && refspec->force)
1789 ref_map->peer_ref->force = 1;
1790 }
1791 }
1792
1793 for (rmp = &ref_map; *rmp; ) {
1794 if ((*rmp)->peer_ref) {
1795 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1796 check_refname_format((*rmp)->peer_ref->name, 0)) {
1797 struct ref *ignore = *rmp;
1798 error("* Ignoring funny ref '%s' locally",
1799 (*rmp)->peer_ref->name);
1800 *rmp = (*rmp)->next;
1801 free(ignore->peer_ref);
1802 free(ignore);
1803 continue;
1804 }
1805 }
1806 rmp = &((*rmp)->next);
1807 }
1808
1809 if (ref_map)
1810 tail_link_ref(ref_map, tail);
1811
1812 return 0;
1813 }
1814
1815 int resolve_remote_symref(struct ref *ref, struct ref *list)
1816 {
1817 if (!ref->symref)
1818 return 0;
1819 for (; list; list = list->next)
1820 if (!strcmp(ref->symref, list->name)) {
1821 oidcpy(&ref->old_oid, &list->old_oid);
1822 return 0;
1823 }
1824 return 1;
1825 }
1826
1827 /*
1828 * Lookup the upstream branch for the given branch and if present, optionally
1829 * compute the commit ahead/behind values for the pair.
1830 *
1831 * If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
1832 * counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
1833 * the (potentially expensive) a/b computation (*num_ours and *num_theirs are
1834 * set to zero).
1835 *
1836 * The name of the upstream branch (or NULL if no upstream is defined) is
1837 * returned via *upstream_name, if it is not itself NULL.
1838 *
1839 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1840 * upstream defined, or ref does not exist). Returns 0 if the commits are
1841 * identical. Returns 1 if commits are different.
1842 */
1843 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1844 const char **upstream_name, enum ahead_behind_flags abf)
1845 {
1846 struct object_id oid;
1847 struct commit *ours, *theirs;
1848 struct rev_info revs;
1849 const char *base;
1850 struct argv_array argv = ARGV_ARRAY_INIT;
1851
1852 /* Cannot stat unless we are marked to build on top of somebody else. */
1853 base = branch_get_upstream(branch, NULL);
1854 if (upstream_name)
1855 *upstream_name = base;
1856 if (!base)
1857 return -1;
1858
1859 /* Cannot stat if what we used to build on no longer exists */
1860 if (read_ref(base, &oid))
1861 return -1;
1862 theirs = lookup_commit_reference(the_repository, &oid);
1863 if (!theirs)
1864 return -1;
1865
1866 if (read_ref(branch->refname, &oid))
1867 return -1;
1868 ours = lookup_commit_reference(the_repository, &oid);
1869 if (!ours)
1870 return -1;
1871
1872 *num_theirs = *num_ours = 0;
1873
1874 /* are we the same? */
1875 if (theirs == ours)
1876 return 0;
1877 if (abf == AHEAD_BEHIND_QUICK)
1878 return 1;
1879 if (abf != AHEAD_BEHIND_FULL)
1880 BUG("stat_tracking_info: invalid abf '%d'", abf);
1881
1882 /* Run "rev-list --left-right ours...theirs" internally... */
1883 argv_array_push(&argv, ""); /* ignored */
1884 argv_array_push(&argv, "--left-right");
1885 argv_array_pushf(&argv, "%s...%s",
1886 oid_to_hex(&ours->object.oid),
1887 oid_to_hex(&theirs->object.oid));
1888 argv_array_push(&argv, "--");
1889
1890 repo_init_revisions(the_repository, &revs, NULL);
1891 setup_revisions(argv.argc, argv.argv, &revs, NULL);
1892 if (prepare_revision_walk(&revs))
1893 die("revision walk setup failed");
1894
1895 /* ... and count the commits on each side. */
1896 while (1) {
1897 struct commit *c = get_revision(&revs);
1898 if (!c)
1899 break;
1900 if (c->object.flags & SYMMETRIC_LEFT)
1901 (*num_ours)++;
1902 else
1903 (*num_theirs)++;
1904 }
1905
1906 /* clear object flags smudged by the above traversal */
1907 clear_commit_marks(ours, ALL_REV_FLAGS);
1908 clear_commit_marks(theirs, ALL_REV_FLAGS);
1909
1910 argv_array_clear(&argv);
1911 return 1;
1912 }
1913
1914 /*
1915 * Return true when there is anything to report, otherwise false.
1916 */
1917 int format_tracking_info(struct branch *branch, struct strbuf *sb,
1918 enum ahead_behind_flags abf)
1919 {
1920 int ours, theirs, sti;
1921 const char *full_base;
1922 char *base;
1923 int upstream_is_gone = 0;
1924
1925 sti = stat_tracking_info(branch, &ours, &theirs, &full_base, abf);
1926 if (sti < 0) {
1927 if (!full_base)
1928 return 0;
1929 upstream_is_gone = 1;
1930 }
1931
1932 base = shorten_unambiguous_ref(full_base, 0);
1933 if (upstream_is_gone) {
1934 strbuf_addf(sb,
1935 _("Your branch is based on '%s', but the upstream is gone.\n"),
1936 base);
1937 if (advice_status_hints)
1938 strbuf_addstr(sb,
1939 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
1940 } else if (!sti) {
1941 strbuf_addf(sb,
1942 _("Your branch is up to date with '%s'.\n"),
1943 base);
1944 } else if (abf == AHEAD_BEHIND_QUICK) {
1945 strbuf_addf(sb,
1946 _("Your branch and '%s' refer to different commits.\n"),
1947 base);
1948 if (advice_status_hints)
1949 strbuf_addf(sb, _(" (use \"%s\" for details)\n"),
1950 "git status --ahead-behind");
1951 } else if (!theirs) {
1952 strbuf_addf(sb,
1953 Q_("Your branch is ahead of '%s' by %d commit.\n",
1954 "Your branch is ahead of '%s' by %d commits.\n",
1955 ours),
1956 base, ours);
1957 if (advice_status_hints)
1958 strbuf_addstr(sb,
1959 _(" (use \"git push\" to publish your local commits)\n"));
1960 } else if (!ours) {
1961 strbuf_addf(sb,
1962 Q_("Your branch is behind '%s' by %d commit, "
1963 "and can be fast-forwarded.\n",
1964 "Your branch is behind '%s' by %d commits, "
1965 "and can be fast-forwarded.\n",
1966 theirs),
1967 base, theirs);
1968 if (advice_status_hints)
1969 strbuf_addstr(sb,
1970 _(" (use \"git pull\" to update your local branch)\n"));
1971 } else {
1972 strbuf_addf(sb,
1973 Q_("Your branch and '%s' have diverged,\n"
1974 "and have %d and %d different commit each, "
1975 "respectively.\n",
1976 "Your branch and '%s' have diverged,\n"
1977 "and have %d and %d different commits each, "
1978 "respectively.\n",
1979 ours + theirs),
1980 base, ours, theirs);
1981 if (advice_status_hints)
1982 strbuf_addstr(sb,
1983 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
1984 }
1985 free(base);
1986 return 1;
1987 }
1988
1989 static int one_local_ref(const char *refname, const struct object_id *oid,
1990 int flag, void *cb_data)
1991 {
1992 struct ref ***local_tail = cb_data;
1993 struct ref *ref;
1994
1995 /* we already know it starts with refs/ to get here */
1996 if (check_refname_format(refname + 5, 0))
1997 return 0;
1998
1999 ref = alloc_ref(refname);
2000 oidcpy(&ref->new_oid, oid);
2001 **local_tail = ref;
2002 *local_tail = &ref->next;
2003 return 0;
2004 }
2005
2006 struct ref *get_local_heads(void)
2007 {
2008 struct ref *local_refs = NULL, **local_tail = &local_refs;
2009
2010 for_each_ref(one_local_ref, &local_tail);
2011 return local_refs;
2012 }
2013
2014 struct ref *guess_remote_head(const struct ref *head,
2015 const struct ref *refs,
2016 int all)
2017 {
2018 const struct ref *r;
2019 struct ref *list = NULL;
2020 struct ref **tail = &list;
2021
2022 if (!head)
2023 return NULL;
2024
2025 /*
2026 * Some transports support directly peeking at
2027 * where HEAD points; if that is the case, then
2028 * we don't have to guess.
2029 */
2030 if (head->symref)
2031 return copy_ref(find_ref_by_name(refs, head->symref));
2032
2033 /* If refs/heads/master could be right, it is. */
2034 if (!all) {
2035 r = find_ref_by_name(refs, "refs/heads/master");
2036 if (r && oideq(&r->old_oid, &head->old_oid))
2037 return copy_ref(r);
2038 }
2039
2040 /* Look for another ref that points there */
2041 for (r = refs; r; r = r->next) {
2042 if (r != head &&
2043 starts_with(r->name, "refs/heads/") &&
2044 oideq(&r->old_oid, &head->old_oid)) {
2045 *tail = copy_ref(r);
2046 tail = &((*tail)->next);
2047 if (!all)
2048 break;
2049 }
2050 }
2051
2052 return list;
2053 }
2054
2055 struct stale_heads_info {
2056 struct string_list *ref_names;
2057 struct ref **stale_refs_tail;
2058 struct refspec *rs;
2059 };
2060
2061 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2062 int flags, void *cb_data)
2063 {
2064 struct stale_heads_info *info = cb_data;
2065 struct string_list matches = STRING_LIST_INIT_DUP;
2066 struct refspec_item query;
2067 int i, stale = 1;
2068 memset(&query, 0, sizeof(struct refspec_item));
2069 query.dst = (char *)refname;
2070
2071 query_refspecs_multiple(info->rs, &query, &matches);
2072 if (matches.nr == 0)
2073 goto clean_exit; /* No matches */
2074
2075 /*
2076 * If we did find a suitable refspec and it's not a symref and
2077 * it's not in the list of refs that currently exist in that
2078 * remote, we consider it to be stale. In order to deal with
2079 * overlapping refspecs, we need to go over all of the
2080 * matching refs.
2081 */
2082 if (flags & REF_ISSYMREF)
2083 goto clean_exit;
2084
2085 for (i = 0; stale && i < matches.nr; i++)
2086 if (string_list_has_string(info->ref_names, matches.items[i].string))
2087 stale = 0;
2088
2089 if (stale) {
2090 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2091 oidcpy(&ref->new_oid, oid);
2092 }
2093
2094 clean_exit:
2095 string_list_clear(&matches, 0);
2096 return 0;
2097 }
2098
2099 struct ref *get_stale_heads(struct refspec *rs, struct ref *fetch_map)
2100 {
2101 struct ref *ref, *stale_refs = NULL;
2102 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2103 struct stale_heads_info info;
2104
2105 info.ref_names = &ref_names;
2106 info.stale_refs_tail = &stale_refs;
2107 info.rs = rs;
2108 for (ref = fetch_map; ref; ref = ref->next)
2109 string_list_append(&ref_names, ref->name);
2110 string_list_sort(&ref_names);
2111 for_each_ref(get_stale_heads_cb, &info);
2112 string_list_clear(&ref_names, 0);
2113 return stale_refs;
2114 }
2115
2116 /*
2117 * Compare-and-swap
2118 */
2119 static void clear_cas_option(struct push_cas_option *cas)
2120 {
2121 int i;
2122
2123 for (i = 0; i < cas->nr; i++)
2124 free(cas->entry[i].refname);
2125 free(cas->entry);
2126 memset(cas, 0, sizeof(*cas));
2127 }
2128
2129 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2130 const char *refname,
2131 size_t refnamelen)
2132 {
2133 struct push_cas *entry;
2134 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2135 entry = &cas->entry[cas->nr++];
2136 memset(entry, 0, sizeof(*entry));
2137 entry->refname = xmemdupz(refname, refnamelen);
2138 return entry;
2139 }
2140
2141 static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2142 {
2143 const char *colon;
2144 struct push_cas *entry;
2145
2146 if (unset) {
2147 /* "--no-<option>" */
2148 clear_cas_option(cas);
2149 return 0;
2150 }
2151
2152 if (!arg) {
2153 /* just "--<option>" */
2154 cas->use_tracking_for_rest = 1;
2155 return 0;
2156 }
2157
2158 /* "--<option>=refname" or "--<option>=refname:value" */
2159 colon = strchrnul(arg, ':');
2160 entry = add_cas_entry(cas, arg, colon - arg);
2161 if (!*colon)
2162 entry->use_tracking = 1;
2163 else if (!colon[1])
2164 oidclr(&entry->expect);
2165 else if (get_oid(colon + 1, &entry->expect))
2166 return error("cannot parse expected object name '%s'", colon + 1);
2167 return 0;
2168 }
2169
2170 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2171 {
2172 return parse_push_cas_option(opt->value, arg, unset);
2173 }
2174
2175 int is_empty_cas(const struct push_cas_option *cas)
2176 {
2177 return !cas->use_tracking_for_rest && !cas->nr;
2178 }
2179
2180 /*
2181 * Look at remote.fetch refspec and see if we have a remote
2182 * tracking branch for the refname there. Fill its current
2183 * value in sha1[].
2184 * If we cannot do so, return negative to signal an error.
2185 */
2186 static int remote_tracking(struct remote *remote, const char *refname,
2187 struct object_id *oid)
2188 {
2189 char *dst;
2190
2191 dst = apply_refspecs(&remote->fetch, refname);
2192 if (!dst)
2193 return -1; /* no tracking ref for refname at remote */
2194 if (read_ref(dst, oid))
2195 return -1; /* we know what the tracking ref is but we cannot read it */
2196 return 0;
2197 }
2198
2199 static void apply_cas(struct push_cas_option *cas,
2200 struct remote *remote,
2201 struct ref *ref)
2202 {
2203 int i;
2204
2205 /* Find an explicit --<option>=<name>[:<value>] entry */
2206 for (i = 0; i < cas->nr; i++) {
2207 struct push_cas *entry = &cas->entry[i];
2208 if (!refname_match(entry->refname, ref->name))
2209 continue;
2210 ref->expect_old_sha1 = 1;
2211 if (!entry->use_tracking)
2212 oidcpy(&ref->old_oid_expect, &entry->expect);
2213 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2214 oidclr(&ref->old_oid_expect);
2215 return;
2216 }
2217
2218 /* Are we using "--<option>" to cover all? */
2219 if (!cas->use_tracking_for_rest)
2220 return;
2221
2222 ref->expect_old_sha1 = 1;
2223 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2224 oidclr(&ref->old_oid_expect);
2225 }
2226
2227 void apply_push_cas(struct push_cas_option *cas,
2228 struct remote *remote,
2229 struct ref *remote_refs)
2230 {
2231 struct ref *ref;
2232 for (ref = remote_refs; ref; ref = ref->next)
2233 apply_cas(cas, remote, ref);
2234 }
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