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push doc: document the DWYM behavior pushing to unqualified <dst>
[git.git] / remote.c
blobf7477b8eb67a2065d6b0e35601a6be709b6d0931
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 #include "advice.h"
17
18 enum map_direction { FROM_SRC, FROM_DST };
19
20 struct counted_string {
21 size_t len;
22 const char *s;
23 };
24 struct rewrite {
25 const char *base;
26 size_t baselen;
27 struct counted_string *instead_of;
28 int instead_of_nr;
29 int instead_of_alloc;
30 };
31 struct rewrites {
32 struct rewrite **rewrite;
33 int rewrite_alloc;
34 int rewrite_nr;
35 };
36
37 static struct remote **remotes;
38 static int remotes_alloc;
39 static int remotes_nr;
40 static struct hashmap remotes_hash;
41
42 static struct branch **branches;
43 static int branches_alloc;
44 static int branches_nr;
45
46 static struct branch *current_branch;
47 static const char *pushremote_name;
48
49 static struct rewrites rewrites;
50 static struct rewrites rewrites_push;
51
52 static int valid_remote(const struct remote *remote)
53 {
54 return (!!remote->url) || (!!remote->foreign_vcs);
55 }
56
57 static const char *alias_url(const char *url, struct rewrites *r)
58 {
59 int i, j;
60 struct counted_string *longest;
61 int longest_i;
62
63 longest = NULL;
64 longest_i = -1;
65 for (i = 0; i < r->rewrite_nr; i++) {
66 if (!r->rewrite[i])
67 continue;
68 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
69 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
70 (!longest ||
71 longest->len < r->rewrite[i]->instead_of[j].len)) {
72 longest = &(r->rewrite[i]->instead_of[j]);
73 longest_i = i;
74 }
75 }
76 }
77 if (!longest)
78 return url;
79
80 return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
81 }
82
83 static void add_url(struct remote *remote, const char *url)
84 {
85 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
86 remote->url[remote->url_nr++] = url;
87 }
88
89 static void add_pushurl(struct remote *remote, const char *pushurl)
90 {
91 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
92 remote->pushurl[remote->pushurl_nr++] = pushurl;
93 }
94
95 static void add_pushurl_alias(struct remote *remote, const char *url)
96 {
97 const char *pushurl = alias_url(url, &rewrites_push);
98 if (pushurl != url)
99 add_pushurl(remote, pushurl);
100 }
101
102 static void add_url_alias(struct remote *remote, const char *url)
103 {
104 add_url(remote, alias_url(url, &rewrites));
105 add_pushurl_alias(remote, url);
106 }
107
108 struct remotes_hash_key {
109 const char *str;
110 int len;
111 };
112
113 static int remotes_hash_cmp(const void *unused_cmp_data,
114 const void *entry,
115 const void *entry_or_key,
116 const void *keydata)
117 {
118 const struct remote *a = entry;
119 const struct remote *b = entry_or_key;
120 const struct remotes_hash_key *key = keydata;
121
122 if (key)
123 return strncmp(a->name, key->str, key->len) || a->name[key->len];
124 else
125 return strcmp(a->name, b->name);
126 }
127
128 static inline void init_remotes_hash(void)
129 {
130 if (!remotes_hash.cmpfn)
131 hashmap_init(&remotes_hash, remotes_hash_cmp, NULL, 0);
132 }
133
134 static struct remote *make_remote(const char *name, int len)
135 {
136 struct remote *ret, *replaced;
137 struct remotes_hash_key lookup;
138 struct hashmap_entry lookup_entry;
139
140 if (!len)
141 len = strlen(name);
142
143 init_remotes_hash();
144 lookup.str = name;
145 lookup.len = len;
146 hashmap_entry_init(&lookup_entry, memhash(name, len));
147
148 if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
149 return ret;
150
151 ret = xcalloc(1, sizeof(struct remote));
152 ret->prune = -1; /* unspecified */
153 ret->prune_tags = -1; /* unspecified */
154 ret->name = xstrndup(name, len);
155 refspec_init(&ret->push, REFSPEC_PUSH);
156 refspec_init(&ret->fetch, REFSPEC_FETCH);
157
158 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
159 remotes[remotes_nr++] = ret;
160
161 hashmap_entry_init(ret, lookup_entry.hash);
162 replaced = hashmap_put(&remotes_hash, ret);
163 assert(replaced == NULL); /* no previous entry overwritten */
164 return ret;
165 }
166
167 static void add_merge(struct branch *branch, const char *name)
168 {
169 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
170 branch->merge_alloc);
171 branch->merge_name[branch->merge_nr++] = name;
172 }
173
174 static struct branch *make_branch(const char *name, int len)
175 {
176 struct branch *ret;
177 int i;
178
179 for (i = 0; i < branches_nr; i++) {
180 if (len ? (!strncmp(name, branches[i]->name, len) &&
181 !branches[i]->name[len]) :
182 !strcmp(name, branches[i]->name))
183 return branches[i];
184 }
185
186 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
187 ret = xcalloc(1, sizeof(struct branch));
188 branches[branches_nr++] = ret;
189 if (len)
190 ret->name = xstrndup(name, len);
191 else
192 ret->name = xstrdup(name);
193 ret->refname = xstrfmt("refs/heads/%s", ret->name);
194
195 return ret;
196 }
197
198 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
199 {
200 struct rewrite *ret;
201 int i;
202
203 for (i = 0; i < r->rewrite_nr; i++) {
204 if (len
205 ? (len == r->rewrite[i]->baselen &&
206 !strncmp(base, r->rewrite[i]->base, len))
207 : !strcmp(base, r->rewrite[i]->base))
208 return r->rewrite[i];
209 }
210
211 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
212 ret = xcalloc(1, sizeof(struct rewrite));
213 r->rewrite[r->rewrite_nr++] = ret;
214 if (len) {
215 ret->base = xstrndup(base, len);
216 ret->baselen = len;
217 }
218 else {
219 ret->base = xstrdup(base);
220 ret->baselen = strlen(base);
221 }
222 return ret;
223 }
224
225 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
226 {
227 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
228 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
229 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
230 rewrite->instead_of_nr++;
231 }
232
233 static const char *skip_spaces(const char *s)
234 {
235 while (isspace(*s))
236 s++;
237 return s;
238 }
239
240 static void read_remotes_file(struct remote *remote)
241 {
242 struct strbuf buf = STRBUF_INIT;
243 FILE *f = fopen_or_warn(git_path("remotes/%s", remote->name), "r");
244
245 if (!f)
246 return;
247 remote->configured_in_repo = 1;
248 remote->origin = REMOTE_REMOTES;
249 while (strbuf_getline(&buf, f) != EOF) {
250 const char *v;
251
252 strbuf_rtrim(&buf);
253
254 if (skip_prefix(buf.buf, "URL:", &v))
255 add_url_alias(remote, xstrdup(skip_spaces(v)));
256 else if (skip_prefix(buf.buf, "Push:", &v))
257 refspec_append(&remote->push, skip_spaces(v));
258 else if (skip_prefix(buf.buf, "Pull:", &v))
259 refspec_append(&remote->fetch, skip_spaces(v));
260 }
261 strbuf_release(&buf);
262 fclose(f);
263 }
264
265 static void read_branches_file(struct remote *remote)
266 {
267 char *frag;
268 struct strbuf buf = STRBUF_INIT;
269 FILE *f = fopen_or_warn(git_path("branches/%s", remote->name), "r");
270
271 if (!f)
272 return;
273
274 strbuf_getline_lf(&buf, f);
275 fclose(f);
276 strbuf_trim(&buf);
277 if (!buf.len) {
278 strbuf_release(&buf);
279 return;
280 }
281
282 remote->configured_in_repo = 1;
283 remote->origin = REMOTE_BRANCHES;
284
285 /*
286 * The branches file would have URL and optionally
287 * #branch specified. The "master" (or specified) branch is
288 * fetched and stored in the local branch matching the
289 * remote name.
290 */
291 frag = strchr(buf.buf, '#');
292 if (frag)
293 *(frag++) = '\0';
294 else
295 frag = "master";
296
297 add_url_alias(remote, strbuf_detach(&buf, NULL));
298 strbuf_addf(&buf, "refs/heads/%s:refs/heads/%s",
299 frag, remote->name);
300 refspec_append(&remote->fetch, buf.buf);
301
302 /*
303 * Cogito compatible push: push current HEAD to remote #branch
304 * (master if missing)
305 */
306 strbuf_reset(&buf);
307 strbuf_addf(&buf, "HEAD:refs/heads/%s", frag);
308 refspec_append(&remote->push, buf.buf);
309 remote->fetch_tags = 1; /* always auto-follow */
310 strbuf_release(&buf);
311 }
312
313 static int handle_config(const char *key, const char *value, void *cb)
314 {
315 const char *name;
316 int namelen;
317 const char *subkey;
318 struct remote *remote;
319 struct branch *branch;
320 if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
321 if (!name)
322 return 0;
323 branch = make_branch(name, namelen);
324 if (!strcmp(subkey, "remote")) {
325 return git_config_string(&branch->remote_name, key, value);
326 } else if (!strcmp(subkey, "pushremote")) {
327 return git_config_string(&branch->pushremote_name, key, value);
328 } else if (!strcmp(subkey, "merge")) {
329 if (!value)
330 return config_error_nonbool(key);
331 add_merge(branch, xstrdup(value));
332 }
333 return 0;
334 }
335 if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
336 struct rewrite *rewrite;
337 if (!name)
338 return 0;
339 if (!strcmp(subkey, "insteadof")) {
340 rewrite = make_rewrite(&rewrites, name, namelen);
341 if (!value)
342 return config_error_nonbool(key);
343 add_instead_of(rewrite, xstrdup(value));
344 } else if (!strcmp(subkey, "pushinsteadof")) {
345 rewrite = make_rewrite(&rewrites_push, name, namelen);
346 if (!value)
347 return config_error_nonbool(key);
348 add_instead_of(rewrite, xstrdup(value));
349 }
350 }
351
352 if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
353 return 0;
354
355 /* Handle remote.* variables */
356 if (!name && !strcmp(subkey, "pushdefault"))
357 return git_config_string(&pushremote_name, key, value);
358
359 if (!name)
360 return 0;
361 /* Handle remote.<name>.* variables */
362 if (*name == '/') {
363 warning("Config remote shorthand cannot begin with '/': %s",
364 name);
365 return 0;
366 }
367 remote = make_remote(name, namelen);
368 remote->origin = REMOTE_CONFIG;
369 if (current_config_scope() == CONFIG_SCOPE_REPO)
370 remote->configured_in_repo = 1;
371 if (!strcmp(subkey, "mirror"))
372 remote->mirror = git_config_bool(key, value);
373 else if (!strcmp(subkey, "skipdefaultupdate"))
374 remote->skip_default_update = git_config_bool(key, value);
375 else if (!strcmp(subkey, "skipfetchall"))
376 remote->skip_default_update = git_config_bool(key, value);
377 else if (!strcmp(subkey, "prune"))
378 remote->prune = git_config_bool(key, value);
379 else if (!strcmp(subkey, "prunetags"))
380 remote->prune_tags = git_config_bool(key, value);
381 else if (!strcmp(subkey, "url")) {
382 const char *v;
383 if (git_config_string(&v, key, value))
384 return -1;
385 add_url(remote, v);
386 } else if (!strcmp(subkey, "pushurl")) {
387 const char *v;
388 if (git_config_string(&v, key, value))
389 return -1;
390 add_pushurl(remote, v);
391 } else if (!strcmp(subkey, "push")) {
392 const char *v;
393 if (git_config_string(&v, key, value))
394 return -1;
395 refspec_append(&remote->push, v);
396 free((char *)v);
397 } else if (!strcmp(subkey, "fetch")) {
398 const char *v;
399 if (git_config_string(&v, key, value))
400 return -1;
401 refspec_append(&remote->fetch, v);
402 free((char *)v);
403 } else if (!strcmp(subkey, "receivepack")) {
404 const char *v;
405 if (git_config_string(&v, key, value))
406 return -1;
407 if (!remote->receivepack)
408 remote->receivepack = v;
409 else
410 error(_("more than one receivepack given, using the first"));
411 } else if (!strcmp(subkey, "uploadpack")) {
412 const char *v;
413 if (git_config_string(&v, key, value))
414 return -1;
415 if (!remote->uploadpack)
416 remote->uploadpack = v;
417 else
418 error(_("more than one uploadpack given, using the first"));
419 } else if (!strcmp(subkey, "tagopt")) {
420 if (!strcmp(value, "--no-tags"))
421 remote->fetch_tags = -1;
422 else if (!strcmp(value, "--tags"))
423 remote->fetch_tags = 2;
424 } else if (!strcmp(subkey, "proxy")) {
425 return git_config_string((const char **)&remote->http_proxy,
426 key, value);
427 } else if (!strcmp(subkey, "proxyauthmethod")) {
428 return git_config_string((const char **)&remote->http_proxy_authmethod,
429 key, value);
430 } else if (!strcmp(subkey, "vcs")) {
431 return git_config_string(&remote->foreign_vcs, key, value);
432 }
433 return 0;
434 }
435
436 static void alias_all_urls(void)
437 {
438 int i, j;
439 for (i = 0; i < remotes_nr; i++) {
440 int add_pushurl_aliases;
441 if (!remotes[i])
442 continue;
443 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
444 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
445 }
446 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
447 for (j = 0; j < remotes[i]->url_nr; j++) {
448 if (add_pushurl_aliases)
449 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
450 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
451 }
452 }
453 }
454
455 static void read_config(void)
456 {
457 static int loaded;
458 int flag;
459
460 if (loaded)
461 return;
462 loaded = 1;
463
464 current_branch = NULL;
465 if (startup_info->have_repository) {
466 const char *head_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flag);
467 if (head_ref && (flag & REF_ISSYMREF) &&
468 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
469 current_branch = make_branch(head_ref, 0);
470 }
471 }
472 git_config(handle_config, NULL);
473 alias_all_urls();
474 }
475
476 static int valid_remote_nick(const char *name)
477 {
478 if (!name[0] || is_dot_or_dotdot(name))
479 return 0;
480
481 /* remote nicknames cannot contain slashes */
482 while (*name)
483 if (is_dir_sep(*name++))
484 return 0;
485 return 1;
486 }
487
488 const char *remote_for_branch(struct branch *branch, int *explicit)
489 {
490 if (branch && branch->remote_name) {
491 if (explicit)
492 *explicit = 1;
493 return branch->remote_name;
494 }
495 if (explicit)
496 *explicit = 0;
497 return "origin";
498 }
499
500 const char *pushremote_for_branch(struct branch *branch, int *explicit)
501 {
502 if (branch && branch->pushremote_name) {
503 if (explicit)
504 *explicit = 1;
505 return branch->pushremote_name;
506 }
507 if (pushremote_name) {
508 if (explicit)
509 *explicit = 1;
510 return pushremote_name;
511 }
512 return remote_for_branch(branch, explicit);
513 }
514
515 const char *remote_ref_for_branch(struct branch *branch, int for_push,
516 int *explicit)
517 {
518 if (branch) {
519 if (!for_push) {
520 if (branch->merge_nr) {
521 if (explicit)
522 *explicit = 1;
523 return branch->merge_name[0];
524 }
525 } else {
526 const char *dst, *remote_name =
527 pushremote_for_branch(branch, NULL);
528 struct remote *remote = remote_get(remote_name);
529
530 if (remote && remote->push.nr &&
531 (dst = apply_refspecs(&remote->push,
532 branch->refname))) {
533 if (explicit)
534 *explicit = 1;
535 return dst;
536 }
537 }
538 }
539 if (explicit)
540 *explicit = 0;
541 return "";
542 }
543
544 static struct remote *remote_get_1(const char *name,
545 const char *(*get_default)(struct branch *, int *))
546 {
547 struct remote *ret;
548 int name_given = 0;
549
550 read_config();
551
552 if (name)
553 name_given = 1;
554 else
555 name = get_default(current_branch, &name_given);
556
557 ret = make_remote(name, 0);
558 if (valid_remote_nick(name) && have_git_dir()) {
559 if (!valid_remote(ret))
560 read_remotes_file(ret);
561 if (!valid_remote(ret))
562 read_branches_file(ret);
563 }
564 if (name_given && !valid_remote(ret))
565 add_url_alias(ret, name);
566 if (!valid_remote(ret))
567 return NULL;
568 return ret;
569 }
570
571 struct remote *remote_get(const char *name)
572 {
573 return remote_get_1(name, remote_for_branch);
574 }
575
576 struct remote *pushremote_get(const char *name)
577 {
578 return remote_get_1(name, pushremote_for_branch);
579 }
580
581 int remote_is_configured(struct remote *remote, int in_repo)
582 {
583 if (!remote)
584 return 0;
585 if (in_repo)
586 return remote->configured_in_repo;
587 return !!remote->origin;
588 }
589
590 int for_each_remote(each_remote_fn fn, void *priv)
591 {
592 int i, result = 0;
593 read_config();
594 for (i = 0; i < remotes_nr && !result; i++) {
595 struct remote *r = remotes[i];
596 if (!r)
597 continue;
598 result = fn(r, priv);
599 }
600 return result;
601 }
602
603 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
604 {
605 if (strcmp(ref1->name, ref2->name)) {
606 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
607 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
608 die(_("Cannot fetch both %s and %s to %s"),
609 ref1->name, ref2->name, ref2->peer_ref->name);
610 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
611 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
612 warning(_("%s usually tracks %s, not %s"),
613 ref2->peer_ref->name, ref2->name, ref1->name);
614 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
615 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
616 die(_("%s tracks both %s and %s"),
617 ref2->peer_ref->name, ref1->name, ref2->name);
618 } else {
619 /*
620 * This last possibility doesn't occur because
621 * FETCH_HEAD_IGNORE entries always appear at
622 * the end of the list.
623 */
624 die(_("Internal error"));
625 }
626 }
627 free(ref2->peer_ref);
628 free(ref2);
629 }
630
631 struct ref *ref_remove_duplicates(struct ref *ref_map)
632 {
633 struct string_list refs = STRING_LIST_INIT_NODUP;
634 struct ref *retval = NULL;
635 struct ref **p = &retval;
636
637 while (ref_map) {
638 struct ref *ref = ref_map;
639
640 ref_map = ref_map->next;
641 ref->next = NULL;
642
643 if (!ref->peer_ref) {
644 *p = ref;
645 p = &ref->next;
646 } else {
647 struct string_list_item *item =
648 string_list_insert(&refs, ref->peer_ref->name);
649
650 if (item->util) {
651 /* Entry already existed */
652 handle_duplicate((struct ref *)item->util, ref);
653 } else {
654 *p = ref;
655 p = &ref->next;
656 item->util = ref;
657 }
658 }
659 }
660
661 string_list_clear(&refs, 0);
662 return retval;
663 }
664
665 int remote_has_url(struct remote *remote, const char *url)
666 {
667 int i;
668 for (i = 0; i < remote->url_nr; i++) {
669 if (!strcmp(remote->url[i], url))
670 return 1;
671 }
672 return 0;
673 }
674
675 static int match_name_with_pattern(const char *key, const char *name,
676 const char *value, char **result)
677 {
678 const char *kstar = strchr(key, '*');
679 size_t klen;
680 size_t ksuffixlen;
681 size_t namelen;
682 int ret;
683 if (!kstar)
684 die("Key '%s' of pattern had no '*'", key);
685 klen = kstar - key;
686 ksuffixlen = strlen(kstar + 1);
687 namelen = strlen(name);
688 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
689 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
690 if (ret && value) {
691 struct strbuf sb = STRBUF_INIT;
692 const char *vstar = strchr(value, '*');
693 if (!vstar)
694 die("Value '%s' of pattern has no '*'", value);
695 strbuf_add(&sb, value, vstar - value);
696 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
697 strbuf_addstr(&sb, vstar + 1);
698 *result = strbuf_detach(&sb, NULL);
699 }
700 return ret;
701 }
702
703 static void query_refspecs_multiple(struct refspec *rs,
704 struct refspec_item *query,
705 struct string_list *results)
706 {
707 int i;
708 int find_src = !query->src;
709
710 if (find_src && !query->dst)
711 error(_("query_refspecs_multiple: need either src or dst"));
712
713 for (i = 0; i < rs->nr; i++) {
714 struct refspec_item *refspec = &rs->items[i];
715 const char *key = find_src ? refspec->dst : refspec->src;
716 const char *value = find_src ? refspec->src : refspec->dst;
717 const char *needle = find_src ? query->dst : query->src;
718 char **result = find_src ? &query->src : &query->dst;
719
720 if (!refspec->dst)
721 continue;
722 if (refspec->pattern) {
723 if (match_name_with_pattern(key, needle, value, result))
724 string_list_append_nodup(results, *result);
725 } else if (!strcmp(needle, key)) {
726 string_list_append(results, value);
727 }
728 }
729 }
730
731 int query_refspecs(struct refspec *rs, struct refspec_item *query)
732 {
733 int i;
734 int find_src = !query->src;
735 const char *needle = find_src ? query->dst : query->src;
736 char **result = find_src ? &query->src : &query->dst;
737
738 if (find_src && !query->dst)
739 return error(_("query_refspecs: need either src or dst"));
740
741 for (i = 0; i < rs->nr; i++) {
742 struct refspec_item *refspec = &rs->items[i];
743 const char *key = find_src ? refspec->dst : refspec->src;
744 const char *value = find_src ? refspec->src : refspec->dst;
745
746 if (!refspec->dst)
747 continue;
748 if (refspec->pattern) {
749 if (match_name_with_pattern(key, needle, value, result)) {
750 query->force = refspec->force;
751 return 0;
752 }
753 } else if (!strcmp(needle, key)) {
754 *result = xstrdup(value);
755 query->force = refspec->force;
756 return 0;
757 }
758 }
759 return -1;
760 }
761
762 char *apply_refspecs(struct refspec *rs, const char *name)
763 {
764 struct refspec_item query;
765
766 memset(&query, 0, sizeof(struct refspec_item));
767 query.src = (char *)name;
768
769 if (query_refspecs(rs, &query))
770 return NULL;
771
772 return query.dst;
773 }
774
775 int remote_find_tracking(struct remote *remote, struct refspec_item *refspec)
776 {
777 return query_refspecs(&remote->fetch, refspec);
778 }
779
780 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
781 const char *name)
782 {
783 size_t len = strlen(name);
784 struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
785 memcpy(ref->name, prefix, prefixlen);
786 memcpy(ref->name + prefixlen, name, len);
787 return ref;
788 }
789
790 struct ref *alloc_ref(const char *name)
791 {
792 return alloc_ref_with_prefix("", 0, name);
793 }
794
795 struct ref *copy_ref(const struct ref *ref)
796 {
797 struct ref *cpy;
798 size_t len;
799 if (!ref)
800 return NULL;
801 len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
802 cpy = xmalloc(len);
803 memcpy(cpy, ref, len);
804 cpy->next = NULL;
805 cpy->symref = xstrdup_or_null(ref->symref);
806 cpy->remote_status = xstrdup_or_null(ref->remote_status);
807 cpy->peer_ref = copy_ref(ref->peer_ref);
808 return cpy;
809 }
810
811 struct ref *copy_ref_list(const struct ref *ref)
812 {
813 struct ref *ret = NULL;
814 struct ref **tail = &ret;
815 while (ref) {
816 *tail = copy_ref(ref);
817 ref = ref->next;
818 tail = &((*tail)->next);
819 }
820 return ret;
821 }
822
823 static void free_ref(struct ref *ref)
824 {
825 if (!ref)
826 return;
827 free_ref(ref->peer_ref);
828 free(ref->remote_status);
829 free(ref->symref);
830 free(ref);
831 }
832
833 void free_refs(struct ref *ref)
834 {
835 struct ref *next;
836 while (ref) {
837 next = ref->next;
838 free_ref(ref);
839 ref = next;
840 }
841 }
842
843 int ref_compare_name(const void *va, const void *vb)
844 {
845 const struct ref *a = va, *b = vb;
846 return strcmp(a->name, b->name);
847 }
848
849 static void *ref_list_get_next(const void *a)
850 {
851 return ((const struct ref *)a)->next;
852 }
853
854 static void ref_list_set_next(void *a, void *next)
855 {
856 ((struct ref *)a)->next = next;
857 }
858
859 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
860 {
861 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
862 }
863
864 int count_refspec_match(const char *pattern,
865 struct ref *refs,
866 struct ref **matched_ref)
867 {
868 int patlen = strlen(pattern);
869 struct ref *matched_weak = NULL;
870 struct ref *matched = NULL;
871 int weak_match = 0;
872 int match = 0;
873
874 for (weak_match = match = 0; refs; refs = refs->next) {
875 char *name = refs->name;
876 int namelen = strlen(name);
877
878 if (!refname_match(pattern, name))
879 continue;
880
881 /* A match is "weak" if it is with refs outside
882 * heads or tags, and did not specify the pattern
883 * in full (e.g. "refs/remotes/origin/master") or at
884 * least from the toplevel (e.g. "remotes/origin/master");
885 * otherwise "git push $URL master" would result in
886 * ambiguity between remotes/origin/master and heads/master
887 * at the remote site.
888 */
889 if (namelen != patlen &&
890 patlen != namelen - 5 &&
891 !starts_with(name, "refs/heads/") &&
892 !starts_with(name, "refs/tags/")) {
893 /* We want to catch the case where only weak
894 * matches are found and there are multiple
895 * matches, and where more than one strong
896 * matches are found, as ambiguous. One
897 * strong match with zero or more weak matches
898 * are acceptable as a unique match.
899 */
900 matched_weak = refs;
901 weak_match++;
902 }
903 else {
904 matched = refs;
905 match++;
906 }
907 }
908 if (!matched) {
909 if (matched_ref)
910 *matched_ref = matched_weak;
911 return weak_match;
912 }
913 else {
914 if (matched_ref)
915 *matched_ref = matched;
916 return match;
917 }
918 }
919
920 static void tail_link_ref(struct ref *ref, struct ref ***tail)
921 {
922 **tail = ref;
923 while (ref->next)
924 ref = ref->next;
925 *tail = &ref->next;
926 }
927
928 static struct ref *alloc_delete_ref(void)
929 {
930 struct ref *ref = alloc_ref("(delete)");
931 oidclr(&ref->new_oid);
932 return ref;
933 }
934
935 static int try_explicit_object_name(const char *name,
936 struct ref **match)
937 {
938 struct object_id oid;
939
940 if (!*name) {
941 if (match)
942 *match = alloc_delete_ref();
943 return 0;
944 }
945
946 if (get_oid(name, &oid))
947 return -1;
948
949 if (match) {
950 *match = alloc_ref(name);
951 oidcpy(&(*match)->new_oid, &oid);
952 }
953 return 0;
954 }
955
956 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
957 {
958 struct ref *ret = alloc_ref(name);
959 tail_link_ref(ret, tail);
960 return ret;
961 }
962
963 static char *guess_ref(const char *name, struct ref *peer)
964 {
965 struct strbuf buf = STRBUF_INIT;
966
967 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
968 NULL, NULL);
969 if (!r)
970 return NULL;
971
972 if (starts_with(r, "refs/heads/")) {
973 strbuf_addstr(&buf, "refs/heads/");
974 } else if (starts_with(r, "refs/tags/")) {
975 strbuf_addstr(&buf, "refs/tags/");
976 } else {
977 return NULL;
978 }
979
980 strbuf_addstr(&buf, name);
981 return strbuf_detach(&buf, NULL);
982 }
983
984 static int match_explicit_lhs(struct ref *src,
985 struct refspec_item *rs,
986 struct ref **match,
987 int *allocated_match)
988 {
989 switch (count_refspec_match(rs->src, src, match)) {
990 case 1:
991 if (allocated_match)
992 *allocated_match = 0;
993 return 0;
994 case 0:
995 /* The source could be in the get_sha1() format
996 * not a reference name. :refs/other is a
997 * way to delete 'other' ref at the remote end.
998 */
999 if (try_explicit_object_name(rs->src, match) < 0)
1000 return error(_("src refspec %s does not match any."), rs->src);
1001 if (allocated_match)
1002 *allocated_match = 1;
1003 return 0;
1004 default:
1005 return error(_("src refspec %s matches more than one."), rs->src);
1006 }
1007 }
1008
1009 static void show_push_unqualified_ref_name_error(const char *dst_value,
1010 const char *matched_src_name)
1011 {
1012 struct object_id oid;
1013 enum object_type type;
1014
1015 /*
1016 * TRANSLATORS: "matches '%s'%" is the <dst> part of "git push
1017 * <remote> <src>:<dst>" push, and "being pushed ('%s')" is
1018 * the <src>.
1019 */
1020 error(_("The destination you provided is not a full refname (i.e.,\n"
1021 "starting with \"refs/\"). We tried to guess what you meant by:\n"
1022 "\n"
1023 "- Looking for a ref that matches '%s' on the remote side.\n"
1024 "- Checking if the <src> being pushed ('%s')\n"
1025 " is a ref in \"refs/{heads,tags}/\". If so we add a corresponding\n"
1026 " refs/{heads,tags}/ prefix on the remote side.\n"
1027 "\n"
1028 "Neither worked, so we gave up. You must fully qualify the ref."),
1029 dst_value, matched_src_name);
1030
1031 if (!advice_push_unqualified_ref_name)
1032 return;
1033
1034 if (get_oid(matched_src_name, &oid))
1035 BUG("'%s' is not a valid object, "
1036 "match_explicit_lhs() should catch this!",
1037 matched_src_name);
1038 type = oid_object_info(the_repository, &oid, NULL);
1039 if (type == OBJ_COMMIT) {
1040 advise(_("The <src> part of the refspec is a commit object.\n"
1041 "Did you mean to create a new branch by pushing to\n"
1042 "'%s:refs/heads/%s'?"),
1043 matched_src_name, dst_value);
1044 } else if (type == OBJ_TAG) {
1045 advise(_("The <src> part of the refspec is a tag object.\n"
1046 "Did you mean to create a new tag by pushing to\n"
1047 "'%s:refs/tags/%s'?"),
1048 matched_src_name, dst_value);
1049 } else if (type == OBJ_TREE) {
1050 advise(_("The <src> part of the refspec is a tree object.\n"
1051 "Did you mean to tag a new tree by pushing to\n"
1052 "'%s:refs/tags/%s'?"),
1053 matched_src_name, dst_value);
1054 } else if (type == OBJ_BLOB) {
1055 advise(_("The <src> part of the refspec is a blob object.\n"
1056 "Did you mean to tag a new blob by pushing to\n"
1057 "'%s:refs/tags/%s'?"),
1058 matched_src_name, dst_value);
1059 } else {
1060 BUG("'%s' should be commit/tag/tree/blob, is '%d'",
1061 matched_src_name, type);
1062 }
1063 }
1064
1065 static int match_explicit(struct ref *src, struct ref *dst,
1066 struct ref ***dst_tail,
1067 struct refspec_item *rs)
1068 {
1069 struct ref *matched_src, *matched_dst;
1070 int allocated_src;
1071
1072 const char *dst_value = rs->dst;
1073 char *dst_guess;
1074
1075 if (rs->pattern || rs->matching)
1076 return 0;
1077
1078 matched_src = matched_dst = NULL;
1079 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1080 return -1;
1081
1082 if (!dst_value) {
1083 int flag;
1084
1085 dst_value = resolve_ref_unsafe(matched_src->name,
1086 RESOLVE_REF_READING,
1087 NULL, &flag);
1088 if (!dst_value ||
1089 ((flag & REF_ISSYMREF) &&
1090 !starts_with(dst_value, "refs/heads/")))
1091 die("%s cannot be resolved to branch.",
1092 matched_src->name);
1093 }
1094
1095 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1096 case 1:
1097 break;
1098 case 0:
1099 if (starts_with(dst_value, "refs/")) {
1100 matched_dst = make_linked_ref(dst_value, dst_tail);
1101
1102 } else if (is_null_oid(&matched_src->new_oid)) {
1103 error(_("unable to delete '%s': remote ref does not exist"),
1104 dst_value);
1105 } else if ((dst_guess = guess_ref(dst_value, matched_src))) {
1106 matched_dst = make_linked_ref(dst_guess, dst_tail);
1107 free(dst_guess);
1108 } else {
1109 show_push_unqualified_ref_name_error(dst_value,
1110 matched_src->name);
1111 }
1112 break;
1113 default:
1114 matched_dst = NULL;
1115 error(_("dst refspec %s matches more than one."),
1116 dst_value);
1117 break;
1118 }
1119 if (!matched_dst)
1120 return -1;
1121 if (matched_dst->peer_ref)
1122 return error(_("dst ref %s receives from more than one src."),
1123 matched_dst->name);
1124 else {
1125 matched_dst->peer_ref = allocated_src ?
1126 matched_src :
1127 copy_ref(matched_src);
1128 matched_dst->force = rs->force;
1129 }
1130 return 0;
1131 }
1132
1133 static int match_explicit_refs(struct ref *src, struct ref *dst,
1134 struct ref ***dst_tail, struct refspec *rs)
1135 {
1136 int i, errs;
1137 for (i = errs = 0; i < rs->nr; i++)
1138 errs += match_explicit(src, dst, dst_tail, &rs->items[i]);
1139 return errs;
1140 }
1141
1142 static char *get_ref_match(const struct refspec *rs, const struct ref *ref,
1143 int send_mirror, int direction,
1144 const struct refspec_item **ret_pat)
1145 {
1146 const struct refspec_item *pat;
1147 char *name;
1148 int i;
1149 int matching_refs = -1;
1150 for (i = 0; i < rs->nr; i++) {
1151 const struct refspec_item *item = &rs->items[i];
1152 if (item->matching &&
1153 (matching_refs == -1 || item->force)) {
1154 matching_refs = i;
1155 continue;
1156 }
1157
1158 if (item->pattern) {
1159 const char *dst_side = item->dst ? item->dst : item->src;
1160 int match;
1161 if (direction == FROM_SRC)
1162 match = match_name_with_pattern(item->src, ref->name, dst_side, &name);
1163 else
1164 match = match_name_with_pattern(dst_side, ref->name, item->src, &name);
1165 if (match) {
1166 matching_refs = i;
1167 break;
1168 }
1169 }
1170 }
1171 if (matching_refs == -1)
1172 return NULL;
1173
1174 pat = &rs->items[matching_refs];
1175 if (pat->matching) {
1176 /*
1177 * "matching refs"; traditionally we pushed everything
1178 * including refs outside refs/heads/ hierarchy, but
1179 * that does not make much sense these days.
1180 */
1181 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1182 return NULL;
1183 name = xstrdup(ref->name);
1184 }
1185 if (ret_pat)
1186 *ret_pat = pat;
1187 return name;
1188 }
1189
1190 static struct ref **tail_ref(struct ref **head)
1191 {
1192 struct ref **tail = head;
1193 while (*tail)
1194 tail = &((*tail)->next);
1195 return tail;
1196 }
1197
1198 struct tips {
1199 struct commit **tip;
1200 int nr, alloc;
1201 };
1202
1203 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1204 {
1205 struct commit *commit;
1206
1207 if (is_null_oid(oid))
1208 return;
1209 commit = lookup_commit_reference_gently(the_repository, oid, 1);
1210 if (!commit || (commit->object.flags & TMP_MARK))
1211 return;
1212 commit->object.flags |= TMP_MARK;
1213 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1214 tips->tip[tips->nr++] = commit;
1215 }
1216
1217 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1218 {
1219 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1220 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1221 struct string_list_item *item;
1222 struct ref *ref;
1223 struct tips sent_tips;
1224
1225 /*
1226 * Collect everything we know they would have at the end of
1227 * this push, and collect all tags they have.
1228 */
1229 memset(&sent_tips, 0, sizeof(sent_tips));
1230 for (ref = *dst; ref; ref = ref->next) {
1231 if (ref->peer_ref &&
1232 !is_null_oid(&ref->peer_ref->new_oid))
1233 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1234 else
1235 add_to_tips(&sent_tips, &ref->old_oid);
1236 if (starts_with(ref->name, "refs/tags/"))
1237 string_list_append(&dst_tag, ref->name);
1238 }
1239 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1240
1241 string_list_sort(&dst_tag);
1242
1243 /* Collect tags they do not have. */
1244 for (ref = src; ref; ref = ref->next) {
1245 if (!starts_with(ref->name, "refs/tags/"))
1246 continue; /* not a tag */
1247 if (string_list_has_string(&dst_tag, ref->name))
1248 continue; /* they already have it */
1249 if (oid_object_info(the_repository, &ref->new_oid, NULL) != OBJ_TAG)
1250 continue; /* be conservative */
1251 item = string_list_append(&src_tag, ref->name);
1252 item->util = ref;
1253 }
1254 string_list_clear(&dst_tag, 0);
1255
1256 /*
1257 * At this point, src_tag lists tags that are missing from
1258 * dst, and sent_tips lists the tips we are pushing or those
1259 * that we know they already have. An element in the src_tag
1260 * that is an ancestor of any of the sent_tips needs to be
1261 * sent to the other side.
1262 */
1263 if (sent_tips.nr) {
1264 const int reachable_flag = 1;
1265 struct commit_list *found_commits;
1266 struct commit **src_commits;
1267 int nr_src_commits = 0, alloc_src_commits = 16;
1268 ALLOC_ARRAY(src_commits, alloc_src_commits);
1269
1270 for_each_string_list_item(item, &src_tag) {
1271 struct ref *ref = item->util;
1272 struct commit *commit;
1273
1274 if (is_null_oid(&ref->new_oid))
1275 continue;
1276 commit = lookup_commit_reference_gently(the_repository,
1277 &ref->new_oid,
1278 1);
1279 if (!commit)
1280 /* not pushing a commit, which is not an error */
1281 continue;
1282
1283 ALLOC_GROW(src_commits, nr_src_commits + 1, alloc_src_commits);
1284 src_commits[nr_src_commits++] = commit;
1285 }
1286
1287 found_commits = get_reachable_subset(sent_tips.tip, sent_tips.nr,
1288 src_commits, nr_src_commits,
1289 reachable_flag);
1290
1291 for_each_string_list_item(item, &src_tag) {
1292 struct ref *dst_ref;
1293 struct ref *ref = item->util;
1294 struct commit *commit;
1295
1296 if (is_null_oid(&ref->new_oid))
1297 continue;
1298 commit = lookup_commit_reference_gently(the_repository,
1299 &ref->new_oid,
1300 1);
1301 if (!commit)
1302 /* not pushing a commit, which is not an error */
1303 continue;
1304
1305 /*
1306 * Is this tag, which they do not have, reachable from
1307 * any of the commits we are sending?
1308 */
1309 if (!(commit->object.flags & reachable_flag))
1310 continue;
1311
1312 /* Add it in */
1313 dst_ref = make_linked_ref(ref->name, dst_tail);
1314 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1315 dst_ref->peer_ref = copy_ref(ref);
1316 }
1317
1318 clear_commit_marks_many(nr_src_commits, src_commits, reachable_flag);
1319 free(src_commits);
1320 free_commit_list(found_commits);
1321 }
1322
1323 string_list_clear(&src_tag, 0);
1324 free(sent_tips.tip);
1325 }
1326
1327 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1328 {
1329 for ( ; list; list = list->next)
1330 if (!strcmp(list->name, name))
1331 return (struct ref *)list;
1332 return NULL;
1333 }
1334
1335 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1336 {
1337 for ( ; ref; ref = ref->next)
1338 string_list_append_nodup(ref_index, ref->name)->util = ref;
1339
1340 string_list_sort(ref_index);
1341 }
1342
1343 /*
1344 * Given only the set of local refs, sanity-check the set of push
1345 * refspecs. We can't catch all errors that match_push_refs would,
1346 * but we can catch some errors early before even talking to the
1347 * remote side.
1348 */
1349 int check_push_refs(struct ref *src, struct refspec *rs)
1350 {
1351 int ret = 0;
1352 int i;
1353
1354 for (i = 0; i < rs->nr; i++) {
1355 struct refspec_item *item = &rs->items[i];
1356
1357 if (item->pattern || item->matching)
1358 continue;
1359
1360 ret |= match_explicit_lhs(src, item, NULL, NULL);
1361 }
1362
1363 return ret;
1364 }
1365
1366 /*
1367 * Given the set of refs the local repository has, the set of refs the
1368 * remote repository has, and the refspec used for push, determine
1369 * what remote refs we will update and with what value by setting
1370 * peer_ref (which object is being pushed) and force (if the push is
1371 * forced) in elements of "dst". The function may add new elements to
1372 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1373 */
1374 int match_push_refs(struct ref *src, struct ref **dst,
1375 struct refspec *rs, int flags)
1376 {
1377 int send_all = flags & MATCH_REFS_ALL;
1378 int send_mirror = flags & MATCH_REFS_MIRROR;
1379 int send_prune = flags & MATCH_REFS_PRUNE;
1380 int errs;
1381 struct ref *ref, **dst_tail = tail_ref(dst);
1382 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1383
1384 /* If no refspec is provided, use the default ":" */
1385 if (!rs->nr)
1386 refspec_append(rs, ":");
1387
1388 errs = match_explicit_refs(src, *dst, &dst_tail, rs);
1389
1390 /* pick the remainder */
1391 for (ref = src; ref; ref = ref->next) {
1392 struct string_list_item *dst_item;
1393 struct ref *dst_peer;
1394 const struct refspec_item *pat = NULL;
1395 char *dst_name;
1396
1397 dst_name = get_ref_match(rs, ref, send_mirror, FROM_SRC, &pat);
1398 if (!dst_name)
1399 continue;
1400
1401 if (!dst_ref_index.nr)
1402 prepare_ref_index(&dst_ref_index, *dst);
1403
1404 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1405 dst_peer = dst_item ? dst_item->util : NULL;
1406 if (dst_peer) {
1407 if (dst_peer->peer_ref)
1408 /* We're already sending something to this ref. */
1409 goto free_name;
1410 } else {
1411 if (pat->matching && !(send_all || send_mirror))
1412 /*
1413 * Remote doesn't have it, and we have no
1414 * explicit pattern, and we don't have
1415 * --all or --mirror.
1416 */
1417 goto free_name;
1418
1419 /* Create a new one and link it */
1420 dst_peer = make_linked_ref(dst_name, &dst_tail);
1421 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1422 string_list_insert(&dst_ref_index,
1423 dst_peer->name)->util = dst_peer;
1424 }
1425 dst_peer->peer_ref = copy_ref(ref);
1426 dst_peer->force = pat->force;
1427 free_name:
1428 free(dst_name);
1429 }
1430
1431 string_list_clear(&dst_ref_index, 0);
1432
1433 if (flags & MATCH_REFS_FOLLOW_TAGS)
1434 add_missing_tags(src, dst, &dst_tail);
1435
1436 if (send_prune) {
1437 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1438 /* check for missing refs on the remote */
1439 for (ref = *dst; ref; ref = ref->next) {
1440 char *src_name;
1441
1442 if (ref->peer_ref)
1443 /* We're already sending something to this ref. */
1444 continue;
1445
1446 src_name = get_ref_match(rs, ref, send_mirror, FROM_DST, NULL);
1447 if (src_name) {
1448 if (!src_ref_index.nr)
1449 prepare_ref_index(&src_ref_index, src);
1450 if (!string_list_has_string(&src_ref_index,
1451 src_name))
1452 ref->peer_ref = alloc_delete_ref();
1453 free(src_name);
1454 }
1455 }
1456 string_list_clear(&src_ref_index, 0);
1457 }
1458
1459 if (errs)
1460 return -1;
1461 return 0;
1462 }
1463
1464 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1465 int force_update)
1466 {
1467 struct ref *ref;
1468
1469 for (ref = remote_refs; ref; ref = ref->next) {
1470 int force_ref_update = ref->force || force_update;
1471 int reject_reason = 0;
1472
1473 if (ref->peer_ref)
1474 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1475 else if (!send_mirror)
1476 continue;
1477
1478 ref->deletion = is_null_oid(&ref->new_oid);
1479 if (!ref->deletion &&
1480 oideq(&ref->old_oid, &ref->new_oid)) {
1481 ref->status = REF_STATUS_UPTODATE;
1482 continue;
1483 }
1484
1485 /*
1486 * If the remote ref has moved and is now different
1487 * from what we expect, reject any push.
1488 *
1489 * It also is an error if the user told us to check
1490 * with the remote-tracking branch to find the value
1491 * to expect, but we did not have such a tracking
1492 * branch.
1493 */
1494 if (ref->expect_old_sha1) {
1495 if (!oideq(&ref->old_oid, &ref->old_oid_expect))
1496 reject_reason = REF_STATUS_REJECT_STALE;
1497 else
1498 /* If the ref isn't stale then force the update. */
1499 force_ref_update = 1;
1500 }
1501
1502 /*
1503 * If the update isn't already rejected then check
1504 * the usual "must fast-forward" rules.
1505 *
1506 * Decide whether an individual refspec A:B can be
1507 * pushed. The push will succeed if any of the
1508 * following are true:
1509 *
1510 * (1) the remote reference B does not exist
1511 *
1512 * (2) the remote reference B is being removed (i.e.,
1513 * pushing :B where no source is specified)
1514 *
1515 * (3) the destination is not under refs/tags/, and
1516 * if the old and new value is a commit, the new
1517 * is a descendant of the old.
1518 *
1519 * (4) it is forced using the +A:B notation, or by
1520 * passing the --force argument
1521 */
1522
1523 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1524 if (starts_with(ref->name, "refs/tags/"))
1525 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1526 else if (!has_object_file(&ref->old_oid))
1527 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1528 else if (!lookup_commit_reference_gently(the_repository, &ref->old_oid, 1) ||
1529 !lookup_commit_reference_gently(the_repository, &ref->new_oid, 1))
1530 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1531 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1532 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1533 }
1534
1535 /*
1536 * "--force" will defeat any rejection implemented
1537 * by the rules above.
1538 */
1539 if (!force_ref_update)
1540 ref->status = reject_reason;
1541 else if (reject_reason)
1542 ref->forced_update = 1;
1543 }
1544 }
1545
1546 static void set_merge(struct branch *ret)
1547 {
1548 struct remote *remote;
1549 char *ref;
1550 struct object_id oid;
1551 int i;
1552
1553 if (!ret)
1554 return; /* no branch */
1555 if (ret->merge)
1556 return; /* already run */
1557 if (!ret->remote_name || !ret->merge_nr) {
1558 /*
1559 * no merge config; let's make sure we don't confuse callers
1560 * with a non-zero merge_nr but a NULL merge
1561 */
1562 ret->merge_nr = 0;
1563 return;
1564 }
1565
1566 remote = remote_get(ret->remote_name);
1567
1568 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1569 for (i = 0; i < ret->merge_nr; i++) {
1570 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1571 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1572 if (!remote_find_tracking(remote, ret->merge[i]) ||
1573 strcmp(ret->remote_name, "."))
1574 continue;
1575 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1576 &oid, &ref) == 1)
1577 ret->merge[i]->dst = ref;
1578 else
1579 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1580 }
1581 }
1582
1583 struct branch *branch_get(const char *name)
1584 {
1585 struct branch *ret;
1586
1587 read_config();
1588 if (!name || !*name || !strcmp(name, "HEAD"))
1589 ret = current_branch;
1590 else
1591 ret = make_branch(name, 0);
1592 set_merge(ret);
1593 return ret;
1594 }
1595
1596 int branch_has_merge_config(struct branch *branch)
1597 {
1598 return branch && !!branch->merge;
1599 }
1600
1601 int branch_merge_matches(struct branch *branch,
1602 int i,
1603 const char *refname)
1604 {
1605 if (!branch || i < 0 || i >= branch->merge_nr)
1606 return 0;
1607 return refname_match(branch->merge[i]->src, refname);
1608 }
1609
1610 __attribute__((format (printf,2,3)))
1611 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1612 {
1613 if (err) {
1614 va_list ap;
1615 va_start(ap, fmt);
1616 strbuf_vaddf(err, fmt, ap);
1617 va_end(ap);
1618 }
1619 return NULL;
1620 }
1621
1622 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1623 {
1624 if (!branch)
1625 return error_buf(err, _("HEAD does not point to a branch"));
1626
1627 if (!branch->merge || !branch->merge[0]) {
1628 /*
1629 * no merge config; is it because the user didn't define any,
1630 * or because it is not a real branch, and get_branch
1631 * auto-vivified it?
1632 */
1633 if (!ref_exists(branch->refname))
1634 return error_buf(err, _("no such branch: '%s'"),
1635 branch->name);
1636 return error_buf(err,
1637 _("no upstream configured for branch '%s'"),
1638 branch->name);
1639 }
1640
1641 if (!branch->merge[0]->dst)
1642 return error_buf(err,
1643 _("upstream branch '%s' not stored as a remote-tracking branch"),
1644 branch->merge[0]->src);
1645
1646 return branch->merge[0]->dst;
1647 }
1648
1649 static const char *tracking_for_push_dest(struct remote *remote,
1650 const char *refname,
1651 struct strbuf *err)
1652 {
1653 char *ret;
1654
1655 ret = apply_refspecs(&remote->fetch, refname);
1656 if (!ret)
1657 return error_buf(err,
1658 _("push destination '%s' on remote '%s' has no local tracking branch"),
1659 refname, remote->name);
1660 return ret;
1661 }
1662
1663 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1664 {
1665 struct remote *remote;
1666
1667 remote = remote_get(pushremote_for_branch(branch, NULL));
1668 if (!remote)
1669 return error_buf(err,
1670 _("branch '%s' has no remote for pushing"),
1671 branch->name);
1672
1673 if (remote->push.nr) {
1674 char *dst;
1675 const char *ret;
1676
1677 dst = apply_refspecs(&remote->push, branch->refname);
1678 if (!dst)
1679 return error_buf(err,
1680 _("push refspecs for '%s' do not include '%s'"),
1681 remote->name, branch->name);
1682
1683 ret = tracking_for_push_dest(remote, dst, err);
1684 free(dst);
1685 return ret;
1686 }
1687
1688 if (remote->mirror)
1689 return tracking_for_push_dest(remote, branch->refname, err);
1690
1691 switch (push_default) {
1692 case PUSH_DEFAULT_NOTHING:
1693 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1694
1695 case PUSH_DEFAULT_MATCHING:
1696 case PUSH_DEFAULT_CURRENT:
1697 return tracking_for_push_dest(remote, branch->refname, err);
1698
1699 case PUSH_DEFAULT_UPSTREAM:
1700 return branch_get_upstream(branch, err);
1701
1702 case PUSH_DEFAULT_UNSPECIFIED:
1703 case PUSH_DEFAULT_SIMPLE:
1704 {
1705 const char *up, *cur;
1706
1707 up = branch_get_upstream(branch, err);
1708 if (!up)
1709 return NULL;
1710 cur = tracking_for_push_dest(remote, branch->refname, err);
1711 if (!cur)
1712 return NULL;
1713 if (strcmp(cur, up))
1714 return error_buf(err,
1715 _("cannot resolve 'simple' push to a single destination"));
1716 return cur;
1717 }
1718 }
1719
1720 BUG("unhandled push situation");
1721 }
1722
1723 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1724 {
1725 if (!branch)
1726 return error_buf(err, _("HEAD does not point to a branch"));
1727
1728 if (!branch->push_tracking_ref)
1729 branch->push_tracking_ref = branch_get_push_1(branch, err);
1730 return branch->push_tracking_ref;
1731 }
1732
1733 static int ignore_symref_update(const char *refname)
1734 {
1735 int flag;
1736
1737 if (!resolve_ref_unsafe(refname, 0, NULL, &flag))
1738 return 0; /* non-existing refs are OK */
1739 return (flag & REF_ISSYMREF);
1740 }
1741
1742 /*
1743 * Create and return a list of (struct ref) consisting of copies of
1744 * each remote_ref that matches refspec. refspec must be a pattern.
1745 * Fill in the copies' peer_ref to describe the local tracking refs to
1746 * which they map. Omit any references that would map to an existing
1747 * local symbolic ref.
1748 */
1749 static struct ref *get_expanded_map(const struct ref *remote_refs,
1750 const struct refspec_item *refspec)
1751 {
1752 const struct ref *ref;
1753 struct ref *ret = NULL;
1754 struct ref **tail = &ret;
1755
1756 for (ref = remote_refs; ref; ref = ref->next) {
1757 char *expn_name = NULL;
1758
1759 if (strchr(ref->name, '^'))
1760 continue; /* a dereference item */
1761 if (match_name_with_pattern(refspec->src, ref->name,
1762 refspec->dst, &expn_name) &&
1763 !ignore_symref_update(expn_name)) {
1764 struct ref *cpy = copy_ref(ref);
1765
1766 cpy->peer_ref = alloc_ref(expn_name);
1767 if (refspec->force)
1768 cpy->peer_ref->force = 1;
1769 *tail = cpy;
1770 tail = &cpy->next;
1771 }
1772 free(expn_name);
1773 }
1774
1775 return ret;
1776 }
1777
1778 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1779 {
1780 const struct ref *ref;
1781 const struct ref *best_match = NULL;
1782 int best_score = 0;
1783
1784 for (ref = refs; ref; ref = ref->next) {
1785 int score = refname_match(name, ref->name);
1786
1787 if (best_score < score) {
1788 best_match = ref;
1789 best_score = score;
1790 }
1791 }
1792 return best_match;
1793 }
1794
1795 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1796 {
1797 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1798
1799 if (!ref)
1800 return NULL;
1801
1802 return copy_ref(ref);
1803 }
1804
1805 static struct ref *get_local_ref(const char *name)
1806 {
1807 if (!name || name[0] == '\0')
1808 return NULL;
1809
1810 if (starts_with(name, "refs/"))
1811 return alloc_ref(name);
1812
1813 if (starts_with(name, "heads/") ||
1814 starts_with(name, "tags/") ||
1815 starts_with(name, "remotes/"))
1816 return alloc_ref_with_prefix("refs/", 5, name);
1817
1818 return alloc_ref_with_prefix("refs/heads/", 11, name);
1819 }
1820
1821 int get_fetch_map(const struct ref *remote_refs,
1822 const struct refspec_item *refspec,
1823 struct ref ***tail,
1824 int missing_ok)
1825 {
1826 struct ref *ref_map, **rmp;
1827
1828 if (refspec->pattern) {
1829 ref_map = get_expanded_map(remote_refs, refspec);
1830 } else {
1831 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1832
1833 if (refspec->exact_sha1) {
1834 ref_map = alloc_ref(name);
1835 get_oid_hex(name, &ref_map->old_oid);
1836 ref_map->exact_oid = 1;
1837 } else {
1838 ref_map = get_remote_ref(remote_refs, name);
1839 }
1840 if (!missing_ok && !ref_map)
1841 die("Couldn't find remote ref %s", name);
1842 if (ref_map) {
1843 ref_map->peer_ref = get_local_ref(refspec->dst);
1844 if (ref_map->peer_ref && refspec->force)
1845 ref_map->peer_ref->force = 1;
1846 }
1847 }
1848
1849 for (rmp = &ref_map; *rmp; ) {
1850 if ((*rmp)->peer_ref) {
1851 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1852 check_refname_format((*rmp)->peer_ref->name, 0)) {
1853 struct ref *ignore = *rmp;
1854 error(_("* Ignoring funny ref '%s' locally"),
1855 (*rmp)->peer_ref->name);
1856 *rmp = (*rmp)->next;
1857 free(ignore->peer_ref);
1858 free(ignore);
1859 continue;
1860 }
1861 }
1862 rmp = &((*rmp)->next);
1863 }
1864
1865 if (ref_map)
1866 tail_link_ref(ref_map, tail);
1867
1868 return 0;
1869 }
1870
1871 int resolve_remote_symref(struct ref *ref, struct ref *list)
1872 {
1873 if (!ref->symref)
1874 return 0;
1875 for (; list; list = list->next)
1876 if (!strcmp(ref->symref, list->name)) {
1877 oidcpy(&ref->old_oid, &list->old_oid);
1878 return 0;
1879 }
1880 return 1;
1881 }
1882
1883 /*
1884 * Lookup the upstream branch for the given branch and if present, optionally
1885 * compute the commit ahead/behind values for the pair.
1886 *
1887 * If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
1888 * counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
1889 * the (potentially expensive) a/b computation (*num_ours and *num_theirs are
1890 * set to zero).
1891 *
1892 * The name of the upstream branch (or NULL if no upstream is defined) is
1893 * returned via *upstream_name, if it is not itself NULL.
1894 *
1895 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1896 * upstream defined, or ref does not exist). Returns 0 if the commits are
1897 * identical. Returns 1 if commits are different.
1898 */
1899 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1900 const char **upstream_name, enum ahead_behind_flags abf)
1901 {
1902 struct object_id oid;
1903 struct commit *ours, *theirs;
1904 struct rev_info revs;
1905 const char *base;
1906 struct argv_array argv = ARGV_ARRAY_INIT;
1907
1908 /* Cannot stat unless we are marked to build on top of somebody else. */
1909 base = branch_get_upstream(branch, NULL);
1910 if (upstream_name)
1911 *upstream_name = base;
1912 if (!base)
1913 return -1;
1914
1915 /* Cannot stat if what we used to build on no longer exists */
1916 if (read_ref(base, &oid))
1917 return -1;
1918 theirs = lookup_commit_reference(the_repository, &oid);
1919 if (!theirs)
1920 return -1;
1921
1922 if (read_ref(branch->refname, &oid))
1923 return -1;
1924 ours = lookup_commit_reference(the_repository, &oid);
1925 if (!ours)
1926 return -1;
1927
1928 *num_theirs = *num_ours = 0;
1929
1930 /* are we the same? */
1931 if (theirs == ours)
1932 return 0;
1933 if (abf == AHEAD_BEHIND_QUICK)
1934 return 1;
1935 if (abf != AHEAD_BEHIND_FULL)
1936 BUG("stat_tracking_info: invalid abf '%d'", abf);
1937
1938 /* Run "rev-list --left-right ours...theirs" internally... */
1939 argv_array_push(&argv, ""); /* ignored */
1940 argv_array_push(&argv, "--left-right");
1941 argv_array_pushf(&argv, "%s...%s",
1942 oid_to_hex(&ours->object.oid),
1943 oid_to_hex(&theirs->object.oid));
1944 argv_array_push(&argv, "--");
1945
1946 repo_init_revisions(the_repository, &revs, NULL);
1947 setup_revisions(argv.argc, argv.argv, &revs, NULL);
1948 if (prepare_revision_walk(&revs))
1949 die("revision walk setup failed");
1950
1951 /* ... and count the commits on each side. */
1952 while (1) {
1953 struct commit *c = get_revision(&revs);
1954 if (!c)
1955 break;
1956 if (c->object.flags & SYMMETRIC_LEFT)
1957 (*num_ours)++;
1958 else
1959 (*num_theirs)++;
1960 }
1961
1962 /* clear object flags smudged by the above traversal */
1963 clear_commit_marks(ours, ALL_REV_FLAGS);
1964 clear_commit_marks(theirs, ALL_REV_FLAGS);
1965
1966 argv_array_clear(&argv);
1967 return 1;
1968 }
1969
1970 /*
1971 * Return true when there is anything to report, otherwise false.
1972 */
1973 int format_tracking_info(struct branch *branch, struct strbuf *sb,
1974 enum ahead_behind_flags abf)
1975 {
1976 int ours, theirs, sti;
1977 const char *full_base;
1978 char *base;
1979 int upstream_is_gone = 0;
1980
1981 sti = stat_tracking_info(branch, &ours, &theirs, &full_base, abf);
1982 if (sti < 0) {
1983 if (!full_base)
1984 return 0;
1985 upstream_is_gone = 1;
1986 }
1987
1988 base = shorten_unambiguous_ref(full_base, 0);
1989 if (upstream_is_gone) {
1990 strbuf_addf(sb,
1991 _("Your branch is based on '%s', but the upstream is gone.\n"),
1992 base);
1993 if (advice_status_hints)
1994 strbuf_addstr(sb,
1995 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
1996 } else if (!sti) {
1997 strbuf_addf(sb,
1998 _("Your branch is up to date with '%s'.\n"),
1999 base);
2000 } else if (abf == AHEAD_BEHIND_QUICK) {
2001 strbuf_addf(sb,
2002 _("Your branch and '%s' refer to different commits.\n"),
2003 base);
2004 if (advice_status_hints)
2005 strbuf_addf(sb, _(" (use \"%s\" for details)\n"),
2006 "git status --ahead-behind");
2007 } else if (!theirs) {
2008 strbuf_addf(sb,
2009 Q_("Your branch is ahead of '%s' by %d commit.\n",
2010 "Your branch is ahead of '%s' by %d commits.\n",
2011 ours),
2012 base, ours);
2013 if (advice_status_hints)
2014 strbuf_addstr(sb,
2015 _(" (use \"git push\" to publish your local commits)\n"));
2016 } else if (!ours) {
2017 strbuf_addf(sb,
2018 Q_("Your branch is behind '%s' by %d commit, "
2019 "and can be fast-forwarded.\n",
2020 "Your branch is behind '%s' by %d commits, "
2021 "and can be fast-forwarded.\n",
2022 theirs),
2023 base, theirs);
2024 if (advice_status_hints)
2025 strbuf_addstr(sb,
2026 _(" (use \"git pull\" to update your local branch)\n"));
2027 } else {
2028 strbuf_addf(sb,
2029 Q_("Your branch and '%s' have diverged,\n"
2030 "and have %d and %d different commit each, "
2031 "respectively.\n",
2032 "Your branch and '%s' have diverged,\n"
2033 "and have %d and %d different commits each, "
2034 "respectively.\n",
2035 ours + theirs),
2036 base, ours, theirs);
2037 if (advice_status_hints)
2038 strbuf_addstr(sb,
2039 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2040 }
2041 free(base);
2042 return 1;
2043 }
2044
2045 static int one_local_ref(const char *refname, const struct object_id *oid,
2046 int flag, void *cb_data)
2047 {
2048 struct ref ***local_tail = cb_data;
2049 struct ref *ref;
2050
2051 /* we already know it starts with refs/ to get here */
2052 if (check_refname_format(refname + 5, 0))
2053 return 0;
2054
2055 ref = alloc_ref(refname);
2056 oidcpy(&ref->new_oid, oid);
2057 **local_tail = ref;
2058 *local_tail = &ref->next;
2059 return 0;
2060 }
2061
2062 struct ref *get_local_heads(void)
2063 {
2064 struct ref *local_refs = NULL, **local_tail = &local_refs;
2065
2066 for_each_ref(one_local_ref, &local_tail);
2067 return local_refs;
2068 }
2069
2070 struct ref *guess_remote_head(const struct ref *head,
2071 const struct ref *refs,
2072 int all)
2073 {
2074 const struct ref *r;
2075 struct ref *list = NULL;
2076 struct ref **tail = &list;
2077
2078 if (!head)
2079 return NULL;
2080
2081 /*
2082 * Some transports support directly peeking at
2083 * where HEAD points; if that is the case, then
2084 * we don't have to guess.
2085 */
2086 if (head->symref)
2087 return copy_ref(find_ref_by_name(refs, head->symref));
2088
2089 /* If refs/heads/master could be right, it is. */
2090 if (!all) {
2091 r = find_ref_by_name(refs, "refs/heads/master");
2092 if (r && oideq(&r->old_oid, &head->old_oid))
2093 return copy_ref(r);
2094 }
2095
2096 /* Look for another ref that points there */
2097 for (r = refs; r; r = r->next) {
2098 if (r != head &&
2099 starts_with(r->name, "refs/heads/") &&
2100 oideq(&r->old_oid, &head->old_oid)) {
2101 *tail = copy_ref(r);
2102 tail = &((*tail)->next);
2103 if (!all)
2104 break;
2105 }
2106 }
2107
2108 return list;
2109 }
2110
2111 struct stale_heads_info {
2112 struct string_list *ref_names;
2113 struct ref **stale_refs_tail;
2114 struct refspec *rs;
2115 };
2116
2117 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2118 int flags, void *cb_data)
2119 {
2120 struct stale_heads_info *info = cb_data;
2121 struct string_list matches = STRING_LIST_INIT_DUP;
2122 struct refspec_item query;
2123 int i, stale = 1;
2124 memset(&query, 0, sizeof(struct refspec_item));
2125 query.dst = (char *)refname;
2126
2127 query_refspecs_multiple(info->rs, &query, &matches);
2128 if (matches.nr == 0)
2129 goto clean_exit; /* No matches */
2130
2131 /*
2132 * If we did find a suitable refspec and it's not a symref and
2133 * it's not in the list of refs that currently exist in that
2134 * remote, we consider it to be stale. In order to deal with
2135 * overlapping refspecs, we need to go over all of the
2136 * matching refs.
2137 */
2138 if (flags & REF_ISSYMREF)
2139 goto clean_exit;
2140
2141 for (i = 0; stale && i < matches.nr; i++)
2142 if (string_list_has_string(info->ref_names, matches.items[i].string))
2143 stale = 0;
2144
2145 if (stale) {
2146 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2147 oidcpy(&ref->new_oid, oid);
2148 }
2149
2150 clean_exit:
2151 string_list_clear(&matches, 0);
2152 return 0;
2153 }
2154
2155 struct ref *get_stale_heads(struct refspec *rs, struct ref *fetch_map)
2156 {
2157 struct ref *ref, *stale_refs = NULL;
2158 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2159 struct stale_heads_info info;
2160
2161 info.ref_names = &ref_names;
2162 info.stale_refs_tail = &stale_refs;
2163 info.rs = rs;
2164 for (ref = fetch_map; ref; ref = ref->next)
2165 string_list_append(&ref_names, ref->name);
2166 string_list_sort(&ref_names);
2167 for_each_ref(get_stale_heads_cb, &info);
2168 string_list_clear(&ref_names, 0);
2169 return stale_refs;
2170 }
2171
2172 /*
2173 * Compare-and-swap
2174 */
2175 static void clear_cas_option(struct push_cas_option *cas)
2176 {
2177 int i;
2178
2179 for (i = 0; i < cas->nr; i++)
2180 free(cas->entry[i].refname);
2181 free(cas->entry);
2182 memset(cas, 0, sizeof(*cas));
2183 }
2184
2185 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2186 const char *refname,
2187 size_t refnamelen)
2188 {
2189 struct push_cas *entry;
2190 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2191 entry = &cas->entry[cas->nr++];
2192 memset(entry, 0, sizeof(*entry));
2193 entry->refname = xmemdupz(refname, refnamelen);
2194 return entry;
2195 }
2196
2197 static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2198 {
2199 const char *colon;
2200 struct push_cas *entry;
2201
2202 if (unset) {
2203 /* "--no-<option>" */
2204 clear_cas_option(cas);
2205 return 0;
2206 }
2207
2208 if (!arg) {
2209 /* just "--<option>" */
2210 cas->use_tracking_for_rest = 1;
2211 return 0;
2212 }
2213
2214 /* "--<option>=refname" or "--<option>=refname:value" */
2215 colon = strchrnul(arg, ':');
2216 entry = add_cas_entry(cas, arg, colon - arg);
2217 if (!*colon)
2218 entry->use_tracking = 1;
2219 else if (!colon[1])
2220 oidclr(&entry->expect);
2221 else if (get_oid(colon + 1, &entry->expect))
2222 return error(_("cannot parse expected object name '%s'"), colon + 1);
2223 return 0;
2224 }
2225
2226 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2227 {
2228 return parse_push_cas_option(opt->value, arg, unset);
2229 }
2230
2231 int is_empty_cas(const struct push_cas_option *cas)
2232 {
2233 return !cas->use_tracking_for_rest && !cas->nr;
2234 }
2235
2236 /*
2237 * Look at remote.fetch refspec and see if we have a remote
2238 * tracking branch for the refname there. Fill its current
2239 * value in sha1[].
2240 * If we cannot do so, return negative to signal an error.
2241 */
2242 static int remote_tracking(struct remote *remote, const char *refname,
2243 struct object_id *oid)
2244 {
2245 char *dst;
2246
2247 dst = apply_refspecs(&remote->fetch, refname);
2248 if (!dst)
2249 return -1; /* no tracking ref for refname at remote */
2250 if (read_ref(dst, oid))
2251 return -1; /* we know what the tracking ref is but we cannot read it */
2252 return 0;
2253 }
2254
2255 static void apply_cas(struct push_cas_option *cas,
2256 struct remote *remote,
2257 struct ref *ref)
2258 {
2259 int i;
2260
2261 /* Find an explicit --<option>=<name>[:<value>] entry */
2262 for (i = 0; i < cas->nr; i++) {
2263 struct push_cas *entry = &cas->entry[i];
2264 if (!refname_match(entry->refname, ref->name))
2265 continue;
2266 ref->expect_old_sha1 = 1;
2267 if (!entry->use_tracking)
2268 oidcpy(&ref->old_oid_expect, &entry->expect);
2269 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2270 oidclr(&ref->old_oid_expect);
2271 return;
2272 }
2273
2274 /* Are we using "--<option>" to cover all? */
2275 if (!cas->use_tracking_for_rest)
2276 return;
2277
2278 ref->expect_old_sha1 = 1;
2279 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2280 oidclr(&ref->old_oid_expect);
2281 }
2282
2283 void apply_push_cas(struct push_cas_option *cas,
2284 struct remote *remote,
2285 struct ref *remote_refs)
2286 {
2287 struct ref *ref;
2288 for (ref = remote_refs; ref; ref = ref->next)
2289 apply_cas(cas, remote, ref);
2290 }
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