?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'jk/doc-diff-parallel'
[git.git] / remote.c
blob593ce297ed2ad41e150a077b67623e12ceaa3d25
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 struct hashmap_entry *eptr,
115 const struct hashmap_entry *entry_or_key,
116 const void *keydata)
117 {
118 const struct remote *a, *b;
119 const struct remotes_hash_key *key = keydata;
120
121 a = container_of(eptr, const struct remote, ent);
122 b = container_of(entry_or_key, const struct remote, ent);
123
124 if (key)
125 return strncmp(a->name, key->str, key->len) || a->name[key->len];
126 else
127 return strcmp(a->name, b->name);
128 }
129
130 static inline void init_remotes_hash(void)
131 {
132 if (!remotes_hash.cmpfn)
133 hashmap_init(&remotes_hash, remotes_hash_cmp, NULL, 0);
134 }
135
136 static struct remote *make_remote(const char *name, int len)
137 {
138 struct remote *ret, *replaced;
139 struct remotes_hash_key lookup;
140 struct hashmap_entry lookup_entry, *e;
141
142 if (!len)
143 len = strlen(name);
144
145 init_remotes_hash();
146 lookup.str = name;
147 lookup.len = len;
148 hashmap_entry_init(&lookup_entry, memhash(name, len));
149
150 e = hashmap_get(&remotes_hash, &lookup_entry, &lookup);
151 if (e)
152 return container_of(e, struct remote, ent);
153
154 ret = xcalloc(1, sizeof(struct remote));
155 ret->prune = -1; /* unspecified */
156 ret->prune_tags = -1; /* unspecified */
157 ret->name = xstrndup(name, len);
158 refspec_init(&ret->push, REFSPEC_PUSH);
159 refspec_init(&ret->fetch, REFSPEC_FETCH);
160
161 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
162 remotes[remotes_nr++] = ret;
163
164 hashmap_entry_init(&ret->ent, lookup_entry.hash);
165 replaced = hashmap_put_entry(&remotes_hash, ret, ent);
166 assert(replaced == NULL); /* no previous entry overwritten */
167 return ret;
168 }
169
170 static void add_merge(struct branch *branch, const char *name)
171 {
172 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
173 branch->merge_alloc);
174 branch->merge_name[branch->merge_nr++] = name;
175 }
176
177 static struct branch *make_branch(const char *name, int len)
178 {
179 struct branch *ret;
180 int i;
181
182 for (i = 0; i < branches_nr; i++) {
183 if (len ? (!strncmp(name, branches[i]->name, len) &&
184 !branches[i]->name[len]) :
185 !strcmp(name, branches[i]->name))
186 return branches[i];
187 }
188
189 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
190 ret = xcalloc(1, sizeof(struct branch));
191 branches[branches_nr++] = ret;
192 if (len)
193 ret->name = xstrndup(name, len);
194 else
195 ret->name = xstrdup(name);
196 ret->refname = xstrfmt("refs/heads/%s", ret->name);
197
198 return ret;
199 }
200
201 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
202 {
203 struct rewrite *ret;
204 int i;
205
206 for (i = 0; i < r->rewrite_nr; i++) {
207 if (len
208 ? (len == r->rewrite[i]->baselen &&
209 !strncmp(base, r->rewrite[i]->base, len))
210 : !strcmp(base, r->rewrite[i]->base))
211 return r->rewrite[i];
212 }
213
214 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
215 ret = xcalloc(1, sizeof(struct rewrite));
216 r->rewrite[r->rewrite_nr++] = ret;
217 if (len) {
218 ret->base = xstrndup(base, len);
219 ret->baselen = len;
220 }
221 else {
222 ret->base = xstrdup(base);
223 ret->baselen = strlen(base);
224 }
225 return ret;
226 }
227
228 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
229 {
230 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
231 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
232 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
233 rewrite->instead_of_nr++;
234 }
235
236 static const char *skip_spaces(const char *s)
237 {
238 while (isspace(*s))
239 s++;
240 return s;
241 }
242
243 static void read_remotes_file(struct remote *remote)
244 {
245 struct strbuf buf = STRBUF_INIT;
246 FILE *f = fopen_or_warn(git_path("remotes/%s", remote->name), "r");
247
248 if (!f)
249 return;
250 remote->configured_in_repo = 1;
251 remote->origin = REMOTE_REMOTES;
252 while (strbuf_getline(&buf, f) != EOF) {
253 const char *v;
254
255 strbuf_rtrim(&buf);
256
257 if (skip_prefix(buf.buf, "URL:", &v))
258 add_url_alias(remote, xstrdup(skip_spaces(v)));
259 else if (skip_prefix(buf.buf, "Push:", &v))
260 refspec_append(&remote->push, skip_spaces(v));
261 else if (skip_prefix(buf.buf, "Pull:", &v))
262 refspec_append(&remote->fetch, skip_spaces(v));
263 }
264 strbuf_release(&buf);
265 fclose(f);
266 }
267
268 static void read_branches_file(struct remote *remote)
269 {
270 char *frag;
271 struct strbuf buf = STRBUF_INIT;
272 FILE *f = fopen_or_warn(git_path("branches/%s", remote->name), "r");
273
274 if (!f)
275 return;
276
277 strbuf_getline_lf(&buf, f);
278 fclose(f);
279 strbuf_trim(&buf);
280 if (!buf.len) {
281 strbuf_release(&buf);
282 return;
283 }
284
285 remote->configured_in_repo = 1;
286 remote->origin = REMOTE_BRANCHES;
287
288 /*
289 * The branches file would have URL and optionally
290 * #branch specified. The "master" (or specified) branch is
291 * fetched and stored in the local branch matching the
292 * remote name.
293 */
294 frag = strchr(buf.buf, '#');
295 if (frag)
296 *(frag++) = '\0';
297 else
298 frag = "master";
299
300 add_url_alias(remote, strbuf_detach(&buf, NULL));
301 strbuf_addf(&buf, "refs/heads/%s:refs/heads/%s",
302 frag, remote->name);
303 refspec_append(&remote->fetch, buf.buf);
304
305 /*
306 * Cogito compatible push: push current HEAD to remote #branch
307 * (master if missing)
308 */
309 strbuf_reset(&buf);
310 strbuf_addf(&buf, "HEAD:refs/heads/%s", frag);
311 refspec_append(&remote->push, buf.buf);
312 remote->fetch_tags = 1; /* always auto-follow */
313 strbuf_release(&buf);
314 }
315
316 static int handle_config(const char *key, const char *value, void *cb)
317 {
318 const char *name;
319 int namelen;
320 const char *subkey;
321 struct remote *remote;
322 struct branch *branch;
323 if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
324 if (!name)
325 return 0;
326 branch = make_branch(name, namelen);
327 if (!strcmp(subkey, "remote")) {
328 return git_config_string(&branch->remote_name, key, value);
329 } else if (!strcmp(subkey, "pushremote")) {
330 return git_config_string(&branch->pushremote_name, key, value);
331 } else if (!strcmp(subkey, "merge")) {
332 if (!value)
333 return config_error_nonbool(key);
334 add_merge(branch, xstrdup(value));
335 }
336 return 0;
337 }
338 if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
339 struct rewrite *rewrite;
340 if (!name)
341 return 0;
342 if (!strcmp(subkey, "insteadof")) {
343 if (!value)
344 return config_error_nonbool(key);
345 rewrite = make_rewrite(&rewrites, name, namelen);
346 add_instead_of(rewrite, xstrdup(value));
347 } else if (!strcmp(subkey, "pushinsteadof")) {
348 if (!value)
349 return config_error_nonbool(key);
350 rewrite = make_rewrite(&rewrites_push, name, namelen);
351 add_instead_of(rewrite, xstrdup(value));
352 }
353 }
354
355 if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
356 return 0;
357
358 /* Handle remote.* variables */
359 if (!name && !strcmp(subkey, "pushdefault"))
360 return git_config_string(&pushremote_name, key, value);
361
362 if (!name)
363 return 0;
364 /* Handle remote.<name>.* variables */
365 if (*name == '/') {
366 warning(_("config remote shorthand cannot begin with '/': %s"),
367 name);
368 return 0;
369 }
370 remote = make_remote(name, namelen);
371 remote->origin = REMOTE_CONFIG;
372 if (current_config_scope() == CONFIG_SCOPE_LOCAL ||
373 current_config_scope() == CONFIG_SCOPE_WORKTREE)
374 remote->configured_in_repo = 1;
375 if (!strcmp(subkey, "mirror"))
376 remote->mirror = git_config_bool(key, value);
377 else if (!strcmp(subkey, "skipdefaultupdate"))
378 remote->skip_default_update = git_config_bool(key, value);
379 else if (!strcmp(subkey, "skipfetchall"))
380 remote->skip_default_update = git_config_bool(key, value);
381 else if (!strcmp(subkey, "prune"))
382 remote->prune = git_config_bool(key, value);
383 else if (!strcmp(subkey, "prunetags"))
384 remote->prune_tags = git_config_bool(key, value);
385 else if (!strcmp(subkey, "url")) {
386 const char *v;
387 if (git_config_string(&v, key, value))
388 return -1;
389 add_url(remote, v);
390 } else if (!strcmp(subkey, "pushurl")) {
391 const char *v;
392 if (git_config_string(&v, key, value))
393 return -1;
394 add_pushurl(remote, v);
395 } else if (!strcmp(subkey, "push")) {
396 const char *v;
397 if (git_config_string(&v, key, value))
398 return -1;
399 refspec_append(&remote->push, v);
400 free((char *)v);
401 } else if (!strcmp(subkey, "fetch")) {
402 const char *v;
403 if (git_config_string(&v, key, value))
404 return -1;
405 refspec_append(&remote->fetch, v);
406 free((char *)v);
407 } else if (!strcmp(subkey, "receivepack")) {
408 const char *v;
409 if (git_config_string(&v, key, value))
410 return -1;
411 if (!remote->receivepack)
412 remote->receivepack = v;
413 else
414 error(_("more than one receivepack given, using the first"));
415 } else if (!strcmp(subkey, "uploadpack")) {
416 const char *v;
417 if (git_config_string(&v, key, value))
418 return -1;
419 if (!remote->uploadpack)
420 remote->uploadpack = v;
421 else
422 error(_("more than one uploadpack given, using the first"));
423 } else if (!strcmp(subkey, "tagopt")) {
424 if (!strcmp(value, "--no-tags"))
425 remote->fetch_tags = -1;
426 else if (!strcmp(value, "--tags"))
427 remote->fetch_tags = 2;
428 } else if (!strcmp(subkey, "proxy")) {
429 return git_config_string((const char **)&remote->http_proxy,
430 key, value);
431 } else if (!strcmp(subkey, "proxyauthmethod")) {
432 return git_config_string((const char **)&remote->http_proxy_authmethod,
433 key, value);
434 } else if (!strcmp(subkey, "vcs")) {
435 return git_config_string(&remote->foreign_vcs, key, value);
436 }
437 return 0;
438 }
439
440 static void alias_all_urls(void)
441 {
442 int i, j;
443 for (i = 0; i < remotes_nr; i++) {
444 int add_pushurl_aliases;
445 if (!remotes[i])
446 continue;
447 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
448 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
449 }
450 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
451 for (j = 0; j < remotes[i]->url_nr; j++) {
452 if (add_pushurl_aliases)
453 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
454 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
455 }
456 }
457 }
458
459 static void read_config(void)
460 {
461 static int loaded;
462 int flag;
463
464 if (loaded)
465 return;
466 loaded = 1;
467
468 current_branch = NULL;
469 if (startup_info->have_repository) {
470 const char *head_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flag);
471 if (head_ref && (flag & REF_ISSYMREF) &&
472 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
473 current_branch = make_branch(head_ref, 0);
474 }
475 }
476 git_config(handle_config, NULL);
477 alias_all_urls();
478 }
479
480 static int valid_remote_nick(const char *name)
481 {
482 if (!name[0] || is_dot_or_dotdot(name))
483 return 0;
484
485 /* remote nicknames cannot contain slashes */
486 while (*name)
487 if (is_dir_sep(*name++))
488 return 0;
489 return 1;
490 }
491
492 const char *remote_for_branch(struct branch *branch, int *explicit)
493 {
494 if (branch && branch->remote_name) {
495 if (explicit)
496 *explicit = 1;
497 return branch->remote_name;
498 }
499 if (explicit)
500 *explicit = 0;
501 return "origin";
502 }
503
504 const char *pushremote_for_branch(struct branch *branch, int *explicit)
505 {
506 if (branch && branch->pushremote_name) {
507 if (explicit)
508 *explicit = 1;
509 return branch->pushremote_name;
510 }
511 if (pushremote_name) {
512 if (explicit)
513 *explicit = 1;
514 return pushremote_name;
515 }
516 return remote_for_branch(branch, explicit);
517 }
518
519 const char *remote_ref_for_branch(struct branch *branch, int for_push,
520 int *explicit)
521 {
522 if (branch) {
523 if (!for_push) {
524 if (branch->merge_nr) {
525 if (explicit)
526 *explicit = 1;
527 return branch->merge_name[0];
528 }
529 } else {
530 const char *dst, *remote_name =
531 pushremote_for_branch(branch, NULL);
532 struct remote *remote = remote_get(remote_name);
533
534 if (remote && remote->push.nr &&
535 (dst = apply_refspecs(&remote->push,
536 branch->refname))) {
537 if (explicit)
538 *explicit = 1;
539 return dst;
540 }
541 }
542 }
543 if (explicit)
544 *explicit = 0;
545 return "";
546 }
547
548 static struct remote *remote_get_1(const char *name,
549 const char *(*get_default)(struct branch *, int *))
550 {
551 struct remote *ret;
552 int name_given = 0;
553
554 read_config();
555
556 if (name)
557 name_given = 1;
558 else
559 name = get_default(current_branch, &name_given);
560
561 ret = make_remote(name, 0);
562 if (valid_remote_nick(name) && have_git_dir()) {
563 if (!valid_remote(ret))
564 read_remotes_file(ret);
565 if (!valid_remote(ret))
566 read_branches_file(ret);
567 }
568 if (name_given && !valid_remote(ret))
569 add_url_alias(ret, name);
570 if (!valid_remote(ret))
571 return NULL;
572 return ret;
573 }
574
575 struct remote *remote_get(const char *name)
576 {
577 return remote_get_1(name, remote_for_branch);
578 }
579
580 struct remote *pushremote_get(const char *name)
581 {
582 return remote_get_1(name, pushremote_for_branch);
583 }
584
585 int remote_is_configured(struct remote *remote, int in_repo)
586 {
587 if (!remote)
588 return 0;
589 if (in_repo)
590 return remote->configured_in_repo;
591 return !!remote->origin;
592 }
593
594 int for_each_remote(each_remote_fn fn, void *priv)
595 {
596 int i, result = 0;
597 read_config();
598 for (i = 0; i < remotes_nr && !result; i++) {
599 struct remote *r = remotes[i];
600 if (!r)
601 continue;
602 result = fn(r, priv);
603 }
604 return result;
605 }
606
607 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
608 {
609 if (strcmp(ref1->name, ref2->name)) {
610 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
611 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
612 die(_("Cannot fetch both %s and %s to %s"),
613 ref1->name, ref2->name, ref2->peer_ref->name);
614 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
615 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
616 warning(_("%s usually tracks %s, not %s"),
617 ref2->peer_ref->name, ref2->name, ref1->name);
618 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
619 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
620 die(_("%s tracks both %s and %s"),
621 ref2->peer_ref->name, ref1->name, ref2->name);
622 } else {
623 /*
624 * This last possibility doesn't occur because
625 * FETCH_HEAD_IGNORE entries always appear at
626 * the end of the list.
627 */
628 BUG("Internal error");
629 }
630 }
631 free(ref2->peer_ref);
632 free(ref2);
633 }
634
635 struct ref *ref_remove_duplicates(struct ref *ref_map)
636 {
637 struct string_list refs = STRING_LIST_INIT_NODUP;
638 struct ref *retval = NULL;
639 struct ref **p = &retval;
640
641 while (ref_map) {
642 struct ref *ref = ref_map;
643
644 ref_map = ref_map->next;
645 ref->next = NULL;
646
647 if (!ref->peer_ref) {
648 *p = ref;
649 p = &ref->next;
650 } else {
651 struct string_list_item *item =
652 string_list_insert(&refs, ref->peer_ref->name);
653
654 if (item->util) {
655 /* Entry already existed */
656 handle_duplicate((struct ref *)item->util, ref);
657 } else {
658 *p = ref;
659 p = &ref->next;
660 item->util = ref;
661 }
662 }
663 }
664
665 string_list_clear(&refs, 0);
666 return retval;
667 }
668
669 int remote_has_url(struct remote *remote, const char *url)
670 {
671 int i;
672 for (i = 0; i < remote->url_nr; i++) {
673 if (!strcmp(remote->url[i], url))
674 return 1;
675 }
676 return 0;
677 }
678
679 static int match_name_with_pattern(const char *key, const char *name,
680 const char *value, char **result)
681 {
682 const char *kstar = strchr(key, '*');
683 size_t klen;
684 size_t ksuffixlen;
685 size_t namelen;
686 int ret;
687 if (!kstar)
688 die(_("key '%s' of pattern had no '*'"), key);
689 klen = kstar - key;
690 ksuffixlen = strlen(kstar + 1);
691 namelen = strlen(name);
692 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
693 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
694 if (ret && value) {
695 struct strbuf sb = STRBUF_INIT;
696 const char *vstar = strchr(value, '*');
697 if (!vstar)
698 die(_("value '%s' of pattern has no '*'"), value);
699 strbuf_add(&sb, value, vstar - value);
700 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
701 strbuf_addstr(&sb, vstar + 1);
702 *result = strbuf_detach(&sb, NULL);
703 }
704 return ret;
705 }
706
707 static void query_refspecs_multiple(struct refspec *rs,
708 struct refspec_item *query,
709 struct string_list *results)
710 {
711 int i;
712 int find_src = !query->src;
713
714 if (find_src && !query->dst)
715 BUG("query_refspecs_multiple: need either src or dst");
716
717 for (i = 0; i < rs->nr; i++) {
718 struct refspec_item *refspec = &rs->items[i];
719 const char *key = find_src ? refspec->dst : refspec->src;
720 const char *value = find_src ? refspec->src : refspec->dst;
721 const char *needle = find_src ? query->dst : query->src;
722 char **result = find_src ? &query->src : &query->dst;
723
724 if (!refspec->dst)
725 continue;
726 if (refspec->pattern) {
727 if (match_name_with_pattern(key, needle, value, result))
728 string_list_append_nodup(results, *result);
729 } else if (!strcmp(needle, key)) {
730 string_list_append(results, value);
731 }
732 }
733 }
734
735 int query_refspecs(struct refspec *rs, struct refspec_item *query)
736 {
737 int i;
738 int find_src = !query->src;
739 const char *needle = find_src ? query->dst : query->src;
740 char **result = find_src ? &query->src : &query->dst;
741
742 if (find_src && !query->dst)
743 BUG("query_refspecs: need either src or dst");
744
745 for (i = 0; i < rs->nr; i++) {
746 struct refspec_item *refspec = &rs->items[i];
747 const char *key = find_src ? refspec->dst : refspec->src;
748 const char *value = find_src ? refspec->src : refspec->dst;
749
750 if (!refspec->dst)
751 continue;
752 if (refspec->pattern) {
753 if (match_name_with_pattern(key, needle, value, result)) {
754 query->force = refspec->force;
755 return 0;
756 }
757 } else if (!strcmp(needle, key)) {
758 *result = xstrdup(value);
759 query->force = refspec->force;
760 return 0;
761 }
762 }
763 return -1;
764 }
765
766 char *apply_refspecs(struct refspec *rs, const char *name)
767 {
768 struct refspec_item query;
769
770 memset(&query, 0, sizeof(struct refspec_item));
771 query.src = (char *)name;
772
773 if (query_refspecs(rs, &query))
774 return NULL;
775
776 return query.dst;
777 }
778
779 int remote_find_tracking(struct remote *remote, struct refspec_item *refspec)
780 {
781 return query_refspecs(&remote->fetch, refspec);
782 }
783
784 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
785 const char *name)
786 {
787 size_t len = strlen(name);
788 struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
789 memcpy(ref->name, prefix, prefixlen);
790 memcpy(ref->name + prefixlen, name, len);
791 return ref;
792 }
793
794 struct ref *alloc_ref(const char *name)
795 {
796 return alloc_ref_with_prefix("", 0, name);
797 }
798
799 struct ref *copy_ref(const struct ref *ref)
800 {
801 struct ref *cpy;
802 size_t len;
803 if (!ref)
804 return NULL;
805 len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
806 cpy = xmalloc(len);
807 memcpy(cpy, ref, len);
808 cpy->next = NULL;
809 cpy->symref = xstrdup_or_null(ref->symref);
810 cpy->remote_status = xstrdup_or_null(ref->remote_status);
811 cpy->peer_ref = copy_ref(ref->peer_ref);
812 return cpy;
813 }
814
815 struct ref *copy_ref_list(const struct ref *ref)
816 {
817 struct ref *ret = NULL;
818 struct ref **tail = &ret;
819 while (ref) {
820 *tail = copy_ref(ref);
821 ref = ref->next;
822 tail = &((*tail)->next);
823 }
824 return ret;
825 }
826
827 void free_one_ref(struct ref *ref)
828 {
829 if (!ref)
830 return;
831 free_one_ref(ref->peer_ref);
832 free(ref->remote_status);
833 free(ref->symref);
834 free(ref);
835 }
836
837 void free_refs(struct ref *ref)
838 {
839 struct ref *next;
840 while (ref) {
841 next = ref->next;
842 free_one_ref(ref);
843 ref = next;
844 }
845 }
846
847 int ref_compare_name(const void *va, const void *vb)
848 {
849 const struct ref *a = va, *b = vb;
850 return strcmp(a->name, b->name);
851 }
852
853 static void *ref_list_get_next(const void *a)
854 {
855 return ((const struct ref *)a)->next;
856 }
857
858 static void ref_list_set_next(void *a, void *next)
859 {
860 ((struct ref *)a)->next = next;
861 }
862
863 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
864 {
865 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
866 }
867
868 int count_refspec_match(const char *pattern,
869 struct ref *refs,
870 struct ref **matched_ref)
871 {
872 int patlen = strlen(pattern);
873 struct ref *matched_weak = NULL;
874 struct ref *matched = NULL;
875 int weak_match = 0;
876 int match = 0;
877
878 for (weak_match = match = 0; refs; refs = refs->next) {
879 char *name = refs->name;
880 int namelen = strlen(name);
881
882 if (!refname_match(pattern, name))
883 continue;
884
885 /* A match is "weak" if it is with refs outside
886 * heads or tags, and did not specify the pattern
887 * in full (e.g. "refs/remotes/origin/master") or at
888 * least from the toplevel (e.g. "remotes/origin/master");
889 * otherwise "git push $URL master" would result in
890 * ambiguity between remotes/origin/master and heads/master
891 * at the remote site.
892 */
893 if (namelen != patlen &&
894 patlen != namelen - 5 &&
895 !starts_with(name, "refs/heads/") &&
896 !starts_with(name, "refs/tags/")) {
897 /* We want to catch the case where only weak
898 * matches are found and there are multiple
899 * matches, and where more than one strong
900 * matches are found, as ambiguous. One
901 * strong match with zero or more weak matches
902 * are acceptable as a unique match.
903 */
904 matched_weak = refs;
905 weak_match++;
906 }
907 else {
908 matched = refs;
909 match++;
910 }
911 }
912 if (!matched) {
913 if (matched_ref)
914 *matched_ref = matched_weak;
915 return weak_match;
916 }
917 else {
918 if (matched_ref)
919 *matched_ref = matched;
920 return match;
921 }
922 }
923
924 static void tail_link_ref(struct ref *ref, struct ref ***tail)
925 {
926 **tail = ref;
927 while (ref->next)
928 ref = ref->next;
929 *tail = &ref->next;
930 }
931
932 static struct ref *alloc_delete_ref(void)
933 {
934 struct ref *ref = alloc_ref("(delete)");
935 oidclr(&ref->new_oid);
936 return ref;
937 }
938
939 static int try_explicit_object_name(const char *name,
940 struct ref **match)
941 {
942 struct object_id oid;
943
944 if (!*name) {
945 if (match)
946 *match = alloc_delete_ref();
947 return 0;
948 }
949
950 if (get_oid(name, &oid))
951 return -1;
952
953 if (match) {
954 *match = alloc_ref(name);
955 oidcpy(&(*match)->new_oid, &oid);
956 }
957 return 0;
958 }
959
960 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
961 {
962 struct ref *ret = alloc_ref(name);
963 tail_link_ref(ret, tail);
964 return ret;
965 }
966
967 static char *guess_ref(const char *name, struct ref *peer)
968 {
969 struct strbuf buf = STRBUF_INIT;
970
971 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
972 NULL, NULL);
973 if (!r)
974 return NULL;
975
976 if (starts_with(r, "refs/heads/")) {
977 strbuf_addstr(&buf, "refs/heads/");
978 } else if (starts_with(r, "refs/tags/")) {
979 strbuf_addstr(&buf, "refs/tags/");
980 } else {
981 return NULL;
982 }
983
984 strbuf_addstr(&buf, name);
985 return strbuf_detach(&buf, NULL);
986 }
987
988 static int match_explicit_lhs(struct ref *src,
989 struct refspec_item *rs,
990 struct ref **match,
991 int *allocated_match)
992 {
993 switch (count_refspec_match(rs->src, src, match)) {
994 case 1:
995 if (allocated_match)
996 *allocated_match = 0;
997 return 0;
998 case 0:
999 /* The source could be in the get_sha1() format
1000 * not a reference name. :refs/other is a
1001 * way to delete 'other' ref at the remote end.
1002 */
1003 if (try_explicit_object_name(rs->src, match) < 0)
1004 return error(_("src refspec %s does not match any"), rs->src);
1005 if (allocated_match)
1006 *allocated_match = 1;
1007 return 0;
1008 default:
1009 return error(_("src refspec %s matches more than one"), rs->src);
1010 }
1011 }
1012
1013 static void show_push_unqualified_ref_name_error(const char *dst_value,
1014 const char *matched_src_name)
1015 {
1016 struct object_id oid;
1017 enum object_type type;
1018
1019 /*
1020 * TRANSLATORS: "matches '%s'%" is the <dst> part of "git push
1021 * <remote> <src>:<dst>" push, and "being pushed ('%s')" is
1022 * the <src>.
1023 */
1024 error(_("The destination you provided is not a full refname (i.e.,\n"
1025 "starting with \"refs/\"). We tried to guess what you meant by:\n"
1026 "\n"
1027 "- Looking for a ref that matches '%s' on the remote side.\n"
1028 "- Checking if the <src> being pushed ('%s')\n"
1029 " is a ref in \"refs/{heads,tags}/\". If so we add a corresponding\n"
1030 " refs/{heads,tags}/ prefix on the remote side.\n"
1031 "\n"
1032 "Neither worked, so we gave up. You must fully qualify the ref."),
1033 dst_value, matched_src_name);
1034
1035 if (!advice_push_unqualified_ref_name)
1036 return;
1037
1038 if (get_oid(matched_src_name, &oid))
1039 BUG("'%s' is not a valid object, "
1040 "match_explicit_lhs() should catch this!",
1041 matched_src_name);
1042 type = oid_object_info(the_repository, &oid, NULL);
1043 if (type == OBJ_COMMIT) {
1044 advise(_("The <src> part of the refspec is a commit object.\n"
1045 "Did you mean to create a new branch by pushing to\n"
1046 "'%s:refs/heads/%s'?"),
1047 matched_src_name, dst_value);
1048 } else if (type == OBJ_TAG) {
1049 advise(_("The <src> part of the refspec is a tag object.\n"
1050 "Did you mean to create a new tag by pushing to\n"
1051 "'%s:refs/tags/%s'?"),
1052 matched_src_name, dst_value);
1053 } else if (type == OBJ_TREE) {
1054 advise(_("The <src> part of the refspec is a tree object.\n"
1055 "Did you mean to tag a new tree by pushing to\n"
1056 "'%s:refs/tags/%s'?"),
1057 matched_src_name, dst_value);
1058 } else if (type == OBJ_BLOB) {
1059 advise(_("The <src> part of the refspec is a blob object.\n"
1060 "Did you mean to tag a new blob by pushing to\n"
1061 "'%s:refs/tags/%s'?"),
1062 matched_src_name, dst_value);
1063 } else {
1064 BUG("'%s' should be commit/tag/tree/blob, is '%d'",
1065 matched_src_name, type);
1066 }
1067 }
1068
1069 static int match_explicit(struct ref *src, struct ref *dst,
1070 struct ref ***dst_tail,
1071 struct refspec_item *rs)
1072 {
1073 struct ref *matched_src, *matched_dst;
1074 int allocated_src;
1075
1076 const char *dst_value = rs->dst;
1077 char *dst_guess;
1078
1079 if (rs->pattern || rs->matching)
1080 return 0;
1081
1082 matched_src = matched_dst = NULL;
1083 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1084 return -1;
1085
1086 if (!dst_value) {
1087 int flag;
1088
1089 dst_value = resolve_ref_unsafe(matched_src->name,
1090 RESOLVE_REF_READING,
1091 NULL, &flag);
1092 if (!dst_value ||
1093 ((flag & REF_ISSYMREF) &&
1094 !starts_with(dst_value, "refs/heads/")))
1095 die(_("%s cannot be resolved to branch"),
1096 matched_src->name);
1097 }
1098
1099 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1100 case 1:
1101 break;
1102 case 0:
1103 if (starts_with(dst_value, "refs/")) {
1104 matched_dst = make_linked_ref(dst_value, dst_tail);
1105 } else if (is_null_oid(&matched_src->new_oid)) {
1106 error(_("unable to delete '%s': remote ref does not exist"),
1107 dst_value);
1108 } else if ((dst_guess = guess_ref(dst_value, matched_src))) {
1109 matched_dst = make_linked_ref(dst_guess, dst_tail);
1110 free(dst_guess);
1111 } else {
1112 show_push_unqualified_ref_name_error(dst_value,
1113 matched_src->name);
1114 }
1115 break;
1116 default:
1117 matched_dst = NULL;
1118 error(_("dst refspec %s matches more than one"),
1119 dst_value);
1120 break;
1121 }
1122 if (!matched_dst)
1123 return -1;
1124 if (matched_dst->peer_ref)
1125 return error(_("dst ref %s receives from more than one src"),
1126 matched_dst->name);
1127 else {
1128 matched_dst->peer_ref = allocated_src ?
1129 matched_src :
1130 copy_ref(matched_src);
1131 matched_dst->force = rs->force;
1132 }
1133 return 0;
1134 }
1135
1136 static int match_explicit_refs(struct ref *src, struct ref *dst,
1137 struct ref ***dst_tail, struct refspec *rs)
1138 {
1139 int i, errs;
1140 for (i = errs = 0; i < rs->nr; i++)
1141 errs += match_explicit(src, dst, dst_tail, &rs->items[i]);
1142 return errs;
1143 }
1144
1145 static char *get_ref_match(const struct refspec *rs, const struct ref *ref,
1146 int send_mirror, int direction,
1147 const struct refspec_item **ret_pat)
1148 {
1149 const struct refspec_item *pat;
1150 char *name;
1151 int i;
1152 int matching_refs = -1;
1153 for (i = 0; i < rs->nr; i++) {
1154 const struct refspec_item *item = &rs->items[i];
1155 if (item->matching &&
1156 (matching_refs == -1 || item->force)) {
1157 matching_refs = i;
1158 continue;
1159 }
1160
1161 if (item->pattern) {
1162 const char *dst_side = item->dst ? item->dst : item->src;
1163 int match;
1164 if (direction == FROM_SRC)
1165 match = match_name_with_pattern(item->src, ref->name, dst_side, &name);
1166 else
1167 match = match_name_with_pattern(dst_side, ref->name, item->src, &name);
1168 if (match) {
1169 matching_refs = i;
1170 break;
1171 }
1172 }
1173 }
1174 if (matching_refs == -1)
1175 return NULL;
1176
1177 pat = &rs->items[matching_refs];
1178 if (pat->matching) {
1179 /*
1180 * "matching refs"; traditionally we pushed everything
1181 * including refs outside refs/heads/ hierarchy, but
1182 * that does not make much sense these days.
1183 */
1184 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1185 return NULL;
1186 name = xstrdup(ref->name);
1187 }
1188 if (ret_pat)
1189 *ret_pat = pat;
1190 return name;
1191 }
1192
1193 static struct ref **tail_ref(struct ref **head)
1194 {
1195 struct ref **tail = head;
1196 while (*tail)
1197 tail = &((*tail)->next);
1198 return tail;
1199 }
1200
1201 struct tips {
1202 struct commit **tip;
1203 int nr, alloc;
1204 };
1205
1206 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1207 {
1208 struct commit *commit;
1209
1210 if (is_null_oid(oid))
1211 return;
1212 commit = lookup_commit_reference_gently(the_repository, oid, 1);
1213 if (!commit || (commit->object.flags & TMP_MARK))
1214 return;
1215 commit->object.flags |= TMP_MARK;
1216 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1217 tips->tip[tips->nr++] = commit;
1218 }
1219
1220 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1221 {
1222 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1223 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1224 struct string_list_item *item;
1225 struct ref *ref;
1226 struct tips sent_tips;
1227
1228 /*
1229 * Collect everything we know they would have at the end of
1230 * this push, and collect all tags they have.
1231 */
1232 memset(&sent_tips, 0, sizeof(sent_tips));
1233 for (ref = *dst; ref; ref = ref->next) {
1234 if (ref->peer_ref &&
1235 !is_null_oid(&ref->peer_ref->new_oid))
1236 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1237 else
1238 add_to_tips(&sent_tips, &ref->old_oid);
1239 if (starts_with(ref->name, "refs/tags/"))
1240 string_list_append(&dst_tag, ref->name);
1241 }
1242 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1243
1244 string_list_sort(&dst_tag);
1245
1246 /* Collect tags they do not have. */
1247 for (ref = src; ref; ref = ref->next) {
1248 if (!starts_with(ref->name, "refs/tags/"))
1249 continue; /* not a tag */
1250 if (string_list_has_string(&dst_tag, ref->name))
1251 continue; /* they already have it */
1252 if (oid_object_info(the_repository, &ref->new_oid, NULL) != OBJ_TAG)
1253 continue; /* be conservative */
1254 item = string_list_append(&src_tag, ref->name);
1255 item->util = ref;
1256 }
1257 string_list_clear(&dst_tag, 0);
1258
1259 /*
1260 * At this point, src_tag lists tags that are missing from
1261 * dst, and sent_tips lists the tips we are pushing or those
1262 * that we know they already have. An element in the src_tag
1263 * that is an ancestor of any of the sent_tips needs to be
1264 * sent to the other side.
1265 */
1266 if (sent_tips.nr) {
1267 const int reachable_flag = 1;
1268 struct commit_list *found_commits;
1269 struct commit **src_commits;
1270 int nr_src_commits = 0, alloc_src_commits = 16;
1271 ALLOC_ARRAY(src_commits, alloc_src_commits);
1272
1273 for_each_string_list_item(item, &src_tag) {
1274 struct ref *ref = item->util;
1275 struct commit *commit;
1276
1277 if (is_null_oid(&ref->new_oid))
1278 continue;
1279 commit = lookup_commit_reference_gently(the_repository,
1280 &ref->new_oid,
1281 1);
1282 if (!commit)
1283 /* not pushing a commit, which is not an error */
1284 continue;
1285
1286 ALLOC_GROW(src_commits, nr_src_commits + 1, alloc_src_commits);
1287 src_commits[nr_src_commits++] = commit;
1288 }
1289
1290 found_commits = get_reachable_subset(sent_tips.tip, sent_tips.nr,
1291 src_commits, nr_src_commits,
1292 reachable_flag);
1293
1294 for_each_string_list_item(item, &src_tag) {
1295 struct ref *dst_ref;
1296 struct ref *ref = item->util;
1297 struct commit *commit;
1298
1299 if (is_null_oid(&ref->new_oid))
1300 continue;
1301 commit = lookup_commit_reference_gently(the_repository,
1302 &ref->new_oid,
1303 1);
1304 if (!commit)
1305 /* not pushing a commit, which is not an error */
1306 continue;
1307
1308 /*
1309 * Is this tag, which they do not have, reachable from
1310 * any of the commits we are sending?
1311 */
1312 if (!(commit->object.flags & reachable_flag))
1313 continue;
1314
1315 /* Add it in */
1316 dst_ref = make_linked_ref(ref->name, dst_tail);
1317 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1318 dst_ref->peer_ref = copy_ref(ref);
1319 }
1320
1321 clear_commit_marks_many(nr_src_commits, src_commits, reachable_flag);
1322 free(src_commits);
1323 free_commit_list(found_commits);
1324 }
1325
1326 string_list_clear(&src_tag, 0);
1327 free(sent_tips.tip);
1328 }
1329
1330 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1331 {
1332 for ( ; list; list = list->next)
1333 if (!strcmp(list->name, name))
1334 return (struct ref *)list;
1335 return NULL;
1336 }
1337
1338 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1339 {
1340 for ( ; ref; ref = ref->next)
1341 string_list_append_nodup(ref_index, ref->name)->util = ref;
1342
1343 string_list_sort(ref_index);
1344 }
1345
1346 /*
1347 * Given only the set of local refs, sanity-check the set of push
1348 * refspecs. We can't catch all errors that match_push_refs would,
1349 * but we can catch some errors early before even talking to the
1350 * remote side.
1351 */
1352 int check_push_refs(struct ref *src, struct refspec *rs)
1353 {
1354 int ret = 0;
1355 int i;
1356
1357 for (i = 0; i < rs->nr; i++) {
1358 struct refspec_item *item = &rs->items[i];
1359
1360 if (item->pattern || item->matching)
1361 continue;
1362
1363 ret |= match_explicit_lhs(src, item, NULL, NULL);
1364 }
1365
1366 return ret;
1367 }
1368
1369 /*
1370 * Given the set of refs the local repository has, the set of refs the
1371 * remote repository has, and the refspec used for push, determine
1372 * what remote refs we will update and with what value by setting
1373 * peer_ref (which object is being pushed) and force (if the push is
1374 * forced) in elements of "dst". The function may add new elements to
1375 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1376 */
1377 int match_push_refs(struct ref *src, struct ref **dst,
1378 struct refspec *rs, int flags)
1379 {
1380 int send_all = flags & MATCH_REFS_ALL;
1381 int send_mirror = flags & MATCH_REFS_MIRROR;
1382 int send_prune = flags & MATCH_REFS_PRUNE;
1383 int errs;
1384 struct ref *ref, **dst_tail = tail_ref(dst);
1385 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1386
1387 /* If no refspec is provided, use the default ":" */
1388 if (!rs->nr)
1389 refspec_append(rs, ":");
1390
1391 errs = match_explicit_refs(src, *dst, &dst_tail, rs);
1392
1393 /* pick the remainder */
1394 for (ref = src; ref; ref = ref->next) {
1395 struct string_list_item *dst_item;
1396 struct ref *dst_peer;
1397 const struct refspec_item *pat = NULL;
1398 char *dst_name;
1399
1400 dst_name = get_ref_match(rs, ref, send_mirror, FROM_SRC, &pat);
1401 if (!dst_name)
1402 continue;
1403
1404 if (!dst_ref_index.nr)
1405 prepare_ref_index(&dst_ref_index, *dst);
1406
1407 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1408 dst_peer = dst_item ? dst_item->util : NULL;
1409 if (dst_peer) {
1410 if (dst_peer->peer_ref)
1411 /* We're already sending something to this ref. */
1412 goto free_name;
1413 } else {
1414 if (pat->matching && !(send_all || send_mirror))
1415 /*
1416 * Remote doesn't have it, and we have no
1417 * explicit pattern, and we don't have
1418 * --all or --mirror.
1419 */
1420 goto free_name;
1421
1422 /* Create a new one and link it */
1423 dst_peer = make_linked_ref(dst_name, &dst_tail);
1424 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1425 string_list_insert(&dst_ref_index,
1426 dst_peer->name)->util = dst_peer;
1427 }
1428 dst_peer->peer_ref = copy_ref(ref);
1429 dst_peer->force = pat->force;
1430 free_name:
1431 free(dst_name);
1432 }
1433
1434 string_list_clear(&dst_ref_index, 0);
1435
1436 if (flags & MATCH_REFS_FOLLOW_TAGS)
1437 add_missing_tags(src, dst, &dst_tail);
1438
1439 if (send_prune) {
1440 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1441 /* check for missing refs on the remote */
1442 for (ref = *dst; ref; ref = ref->next) {
1443 char *src_name;
1444
1445 if (ref->peer_ref)
1446 /* We're already sending something to this ref. */
1447 continue;
1448
1449 src_name = get_ref_match(rs, ref, send_mirror, FROM_DST, NULL);
1450 if (src_name) {
1451 if (!src_ref_index.nr)
1452 prepare_ref_index(&src_ref_index, src);
1453 if (!string_list_has_string(&src_ref_index,
1454 src_name))
1455 ref->peer_ref = alloc_delete_ref();
1456 free(src_name);
1457 }
1458 }
1459 string_list_clear(&src_ref_index, 0);
1460 }
1461
1462 if (errs)
1463 return -1;
1464 return 0;
1465 }
1466
1467 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1468 int force_update)
1469 {
1470 struct ref *ref;
1471
1472 for (ref = remote_refs; ref; ref = ref->next) {
1473 int force_ref_update = ref->force || force_update;
1474 int reject_reason = 0;
1475
1476 if (ref->peer_ref)
1477 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1478 else if (!send_mirror)
1479 continue;
1480
1481 ref->deletion = is_null_oid(&ref->new_oid);
1482 if (!ref->deletion &&
1483 oideq(&ref->old_oid, &ref->new_oid)) {
1484 ref->status = REF_STATUS_UPTODATE;
1485 continue;
1486 }
1487
1488 /*
1489 * If the remote ref has moved and is now different
1490 * from what we expect, reject any push.
1491 *
1492 * It also is an error if the user told us to check
1493 * with the remote-tracking branch to find the value
1494 * to expect, but we did not have such a tracking
1495 * branch.
1496 */
1497 if (ref->expect_old_sha1) {
1498 if (!oideq(&ref->old_oid, &ref->old_oid_expect))
1499 reject_reason = REF_STATUS_REJECT_STALE;
1500 else
1501 /* If the ref isn't stale then force the update. */
1502 force_ref_update = 1;
1503 }
1504
1505 /*
1506 * If the update isn't already rejected then check
1507 * the usual "must fast-forward" rules.
1508 *
1509 * Decide whether an individual refspec A:B can be
1510 * pushed. The push will succeed if any of the
1511 * following are true:
1512 *
1513 * (1) the remote reference B does not exist
1514 *
1515 * (2) the remote reference B is being removed (i.e.,
1516 * pushing :B where no source is specified)
1517 *
1518 * (3) the destination is not under refs/tags/, and
1519 * if the old and new value is a commit, the new
1520 * is a descendant of the old.
1521 *
1522 * (4) it is forced using the +A:B notation, or by
1523 * passing the --force argument
1524 */
1525
1526 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1527 if (starts_with(ref->name, "refs/tags/"))
1528 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1529 else if (!has_object_file(&ref->old_oid))
1530 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1531 else if (!lookup_commit_reference_gently(the_repository, &ref->old_oid, 1) ||
1532 !lookup_commit_reference_gently(the_repository, &ref->new_oid, 1))
1533 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1534 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1535 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1536 }
1537
1538 /*
1539 * "--force" will defeat any rejection implemented
1540 * by the rules above.
1541 */
1542 if (!force_ref_update)
1543 ref->status = reject_reason;
1544 else if (reject_reason)
1545 ref->forced_update = 1;
1546 }
1547 }
1548
1549 static void set_merge(struct branch *ret)
1550 {
1551 struct remote *remote;
1552 char *ref;
1553 struct object_id oid;
1554 int i;
1555
1556 if (!ret)
1557 return; /* no branch */
1558 if (ret->merge)
1559 return; /* already run */
1560 if (!ret->remote_name || !ret->merge_nr) {
1561 /*
1562 * no merge config; let's make sure we don't confuse callers
1563 * with a non-zero merge_nr but a NULL merge
1564 */
1565 ret->merge_nr = 0;
1566 return;
1567 }
1568
1569 remote = remote_get(ret->remote_name);
1570
1571 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1572 for (i = 0; i < ret->merge_nr; i++) {
1573 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1574 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1575 if (!remote_find_tracking(remote, ret->merge[i]) ||
1576 strcmp(ret->remote_name, "."))
1577 continue;
1578 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1579 &oid, &ref) == 1)
1580 ret->merge[i]->dst = ref;
1581 else
1582 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1583 }
1584 }
1585
1586 struct branch *branch_get(const char *name)
1587 {
1588 struct branch *ret;
1589
1590 read_config();
1591 if (!name || !*name || !strcmp(name, "HEAD"))
1592 ret = current_branch;
1593 else
1594 ret = make_branch(name, 0);
1595 set_merge(ret);
1596 return ret;
1597 }
1598
1599 int branch_has_merge_config(struct branch *branch)
1600 {
1601 return branch && !!branch->merge;
1602 }
1603
1604 int branch_merge_matches(struct branch *branch,
1605 int i,
1606 const char *refname)
1607 {
1608 if (!branch || i < 0 || i >= branch->merge_nr)
1609 return 0;
1610 return refname_match(branch->merge[i]->src, refname);
1611 }
1612
1613 __attribute__((format (printf,2,3)))
1614 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1615 {
1616 if (err) {
1617 va_list ap;
1618 va_start(ap, fmt);
1619 strbuf_vaddf(err, fmt, ap);
1620 va_end(ap);
1621 }
1622 return NULL;
1623 }
1624
1625 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1626 {
1627 if (!branch)
1628 return error_buf(err, _("HEAD does not point to a branch"));
1629
1630 if (!branch->merge || !branch->merge[0]) {
1631 /*
1632 * no merge config; is it because the user didn't define any,
1633 * or because it is not a real branch, and get_branch
1634 * auto-vivified it?
1635 */
1636 if (!ref_exists(branch->refname))
1637 return error_buf(err, _("no such branch: '%s'"),
1638 branch->name);
1639 return error_buf(err,
1640 _("no upstream configured for branch '%s'"),
1641 branch->name);
1642 }
1643
1644 if (!branch->merge[0]->dst)
1645 return error_buf(err,
1646 _("upstream branch '%s' not stored as a remote-tracking branch"),
1647 branch->merge[0]->src);
1648
1649 return branch->merge[0]->dst;
1650 }
1651
1652 static const char *tracking_for_push_dest(struct remote *remote,
1653 const char *refname,
1654 struct strbuf *err)
1655 {
1656 char *ret;
1657
1658 ret = apply_refspecs(&remote->fetch, refname);
1659 if (!ret)
1660 return error_buf(err,
1661 _("push destination '%s' on remote '%s' has no local tracking branch"),
1662 refname, remote->name);
1663 return ret;
1664 }
1665
1666 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1667 {
1668 struct remote *remote;
1669
1670 remote = remote_get(pushremote_for_branch(branch, NULL));
1671 if (!remote)
1672 return error_buf(err,
1673 _("branch '%s' has no remote for pushing"),
1674 branch->name);
1675
1676 if (remote->push.nr) {
1677 char *dst;
1678 const char *ret;
1679
1680 dst = apply_refspecs(&remote->push, branch->refname);
1681 if (!dst)
1682 return error_buf(err,
1683 _("push refspecs for '%s' do not include '%s'"),
1684 remote->name, branch->name);
1685
1686 ret = tracking_for_push_dest(remote, dst, err);
1687 free(dst);
1688 return ret;
1689 }
1690
1691 if (remote->mirror)
1692 return tracking_for_push_dest(remote, branch->refname, err);
1693
1694 switch (push_default) {
1695 case PUSH_DEFAULT_NOTHING:
1696 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1697
1698 case PUSH_DEFAULT_MATCHING:
1699 case PUSH_DEFAULT_CURRENT:
1700 return tracking_for_push_dest(remote, branch->refname, err);
1701
1702 case PUSH_DEFAULT_UPSTREAM:
1703 return branch_get_upstream(branch, err);
1704
1705 case PUSH_DEFAULT_UNSPECIFIED:
1706 case PUSH_DEFAULT_SIMPLE:
1707 {
1708 const char *up, *cur;
1709
1710 up = branch_get_upstream(branch, err);
1711 if (!up)
1712 return NULL;
1713 cur = tracking_for_push_dest(remote, branch->refname, err);
1714 if (!cur)
1715 return NULL;
1716 if (strcmp(cur, up))
1717 return error_buf(err,
1718 _("cannot resolve 'simple' push to a single destination"));
1719 return cur;
1720 }
1721 }
1722
1723 BUG("unhandled push situation");
1724 }
1725
1726 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1727 {
1728 if (!branch)
1729 return error_buf(err, _("HEAD does not point to a branch"));
1730
1731 if (!branch->push_tracking_ref)
1732 branch->push_tracking_ref = branch_get_push_1(branch, err);
1733 return branch->push_tracking_ref;
1734 }
1735
1736 static int ignore_symref_update(const char *refname)
1737 {
1738 int flag;
1739
1740 if (!resolve_ref_unsafe(refname, 0, NULL, &flag))
1741 return 0; /* non-existing refs are OK */
1742 return (flag & REF_ISSYMREF);
1743 }
1744
1745 /*
1746 * Create and return a list of (struct ref) consisting of copies of
1747 * each remote_ref that matches refspec. refspec must be a pattern.
1748 * Fill in the copies' peer_ref to describe the local tracking refs to
1749 * which they map. Omit any references that would map to an existing
1750 * local symbolic ref.
1751 */
1752 static struct ref *get_expanded_map(const struct ref *remote_refs,
1753 const struct refspec_item *refspec)
1754 {
1755 const struct ref *ref;
1756 struct ref *ret = NULL;
1757 struct ref **tail = &ret;
1758
1759 for (ref = remote_refs; ref; ref = ref->next) {
1760 char *expn_name = NULL;
1761
1762 if (strchr(ref->name, '^'))
1763 continue; /* a dereference item */
1764 if (match_name_with_pattern(refspec->src, ref->name,
1765 refspec->dst, &expn_name) &&
1766 !ignore_symref_update(expn_name)) {
1767 struct ref *cpy = copy_ref(ref);
1768
1769 cpy->peer_ref = alloc_ref(expn_name);
1770 if (refspec->force)
1771 cpy->peer_ref->force = 1;
1772 *tail = cpy;
1773 tail = &cpy->next;
1774 }
1775 free(expn_name);
1776 }
1777
1778 return ret;
1779 }
1780
1781 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1782 {
1783 const struct ref *ref;
1784 const struct ref *best_match = NULL;
1785 int best_score = 0;
1786
1787 for (ref = refs; ref; ref = ref->next) {
1788 int score = refname_match(name, ref->name);
1789
1790 if (best_score < score) {
1791 best_match = ref;
1792 best_score = score;
1793 }
1794 }
1795 return best_match;
1796 }
1797
1798 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1799 {
1800 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1801
1802 if (!ref)
1803 return NULL;
1804
1805 return copy_ref(ref);
1806 }
1807
1808 static struct ref *get_local_ref(const char *name)
1809 {
1810 if (!name || name[0] == '\0')
1811 return NULL;
1812
1813 if (starts_with(name, "refs/"))
1814 return alloc_ref(name);
1815
1816 if (starts_with(name, "heads/") ||
1817 starts_with(name, "tags/") ||
1818 starts_with(name, "remotes/"))
1819 return alloc_ref_with_prefix("refs/", 5, name);
1820
1821 return alloc_ref_with_prefix("refs/heads/", 11, name);
1822 }
1823
1824 int get_fetch_map(const struct ref *remote_refs,
1825 const struct refspec_item *refspec,
1826 struct ref ***tail,
1827 int missing_ok)
1828 {
1829 struct ref *ref_map, **rmp;
1830
1831 if (refspec->pattern) {
1832 ref_map = get_expanded_map(remote_refs, refspec);
1833 } else {
1834 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1835
1836 if (refspec->exact_sha1) {
1837 ref_map = alloc_ref(name);
1838 get_oid_hex(name, &ref_map->old_oid);
1839 ref_map->exact_oid = 1;
1840 } else {
1841 ref_map = get_remote_ref(remote_refs, name);
1842 }
1843 if (!missing_ok && !ref_map)
1844 die(_("couldn't find remote ref %s"), name);
1845 if (ref_map) {
1846 ref_map->peer_ref = get_local_ref(refspec->dst);
1847 if (ref_map->peer_ref && refspec->force)
1848 ref_map->peer_ref->force = 1;
1849 }
1850 }
1851
1852 for (rmp = &ref_map; *rmp; ) {
1853 if ((*rmp)->peer_ref) {
1854 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1855 check_refname_format((*rmp)->peer_ref->name, 0)) {
1856 struct ref *ignore = *rmp;
1857 error(_("* Ignoring funny ref '%s' locally"),
1858 (*rmp)->peer_ref->name);
1859 *rmp = (*rmp)->next;
1860 free(ignore->peer_ref);
1861 free(ignore);
1862 continue;
1863 }
1864 }
1865 rmp = &((*rmp)->next);
1866 }
1867
1868 if (ref_map)
1869 tail_link_ref(ref_map, tail);
1870
1871 return 0;
1872 }
1873
1874 int resolve_remote_symref(struct ref *ref, struct ref *list)
1875 {
1876 if (!ref->symref)
1877 return 0;
1878 for (; list; list = list->next)
1879 if (!strcmp(ref->symref, list->name)) {
1880 oidcpy(&ref->old_oid, &list->old_oid);
1881 return 0;
1882 }
1883 return 1;
1884 }
1885
1886 /*
1887 * Compute the commit ahead/behind values for the pair branch_name, base.
1888 *
1889 * If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
1890 * counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
1891 * the (potentially expensive) a/b computation (*num_ours and *num_theirs are
1892 * set to zero).
1893 *
1894 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., ref
1895 * does not exist). Returns 0 if the commits are identical. Returns 1 if
1896 * commits are different.
1897 */
1898
1899 static int stat_branch_pair(const char *branch_name, const char *base,
1900 int *num_ours, int *num_theirs,
1901 enum ahead_behind_flags abf)
1902 {
1903 struct object_id oid;
1904 struct commit *ours, *theirs;
1905 struct rev_info revs;
1906 struct argv_array argv = ARGV_ARRAY_INIT;
1907
1908 /* Cannot stat if what we used to build on no longer exists */
1909 if (read_ref(base, &oid))
1910 return -1;
1911 theirs = lookup_commit_reference(the_repository, &oid);
1912 if (!theirs)
1913 return -1;
1914
1915 if (read_ref(branch_name, &oid))
1916 return -1;
1917 ours = lookup_commit_reference(the_repository, &oid);
1918 if (!ours)
1919 return -1;
1920
1921 *num_theirs = *num_ours = 0;
1922
1923 /* are we the same? */
1924 if (theirs == ours)
1925 return 0;
1926 if (abf == AHEAD_BEHIND_QUICK)
1927 return 1;
1928 if (abf != AHEAD_BEHIND_FULL)
1929 BUG("stat_branch_pair: invalid abf '%d'", abf);
1930
1931 /* Run "rev-list --left-right ours...theirs" internally... */
1932 argv_array_push(&argv, ""); /* ignored */
1933 argv_array_push(&argv, "--left-right");
1934 argv_array_pushf(&argv, "%s...%s",
1935 oid_to_hex(&ours->object.oid),
1936 oid_to_hex(&theirs->object.oid));
1937 argv_array_push(&argv, "--");
1938
1939 repo_init_revisions(the_repository, &revs, NULL);
1940 setup_revisions(argv.argc, argv.argv, &revs, NULL);
1941 if (prepare_revision_walk(&revs))
1942 die(_("revision walk setup failed"));
1943
1944 /* ... and count the commits on each side. */
1945 while (1) {
1946 struct commit *c = get_revision(&revs);
1947 if (!c)
1948 break;
1949 if (c->object.flags & SYMMETRIC_LEFT)
1950 (*num_ours)++;
1951 else
1952 (*num_theirs)++;
1953 }
1954
1955 /* clear object flags smudged by the above traversal */
1956 clear_commit_marks(ours, ALL_REV_FLAGS);
1957 clear_commit_marks(theirs, ALL_REV_FLAGS);
1958
1959 argv_array_clear(&argv);
1960 return 1;
1961 }
1962
1963 /*
1964 * Lookup the tracking branch for the given branch and if present, optionally
1965 * compute the commit ahead/behind values for the pair.
1966 *
1967 * If for_push is true, the tracking branch refers to the push branch,
1968 * otherwise it refers to the upstream branch.
1969 *
1970 * The name of the tracking branch (or NULL if it is not defined) is
1971 * returned via *tracking_name, if it is not itself NULL.
1972 *
1973 * If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
1974 * counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
1975 * the (potentially expensive) a/b computation (*num_ours and *num_theirs are
1976 * set to zero).
1977 *
1978 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1979 * upstream defined, or ref does not exist). Returns 0 if the commits are
1980 * identical. Returns 1 if commits are different.
1981 */
1982 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1983 const char **tracking_name, int for_push,
1984 enum ahead_behind_flags abf)
1985 {
1986 const char *base;
1987
1988 /* Cannot stat unless we are marked to build on top of somebody else. */
1989 base = for_push ? branch_get_push(branch, NULL) :
1990 branch_get_upstream(branch, NULL);
1991 if (tracking_name)
1992 *tracking_name = base;
1993 if (!base)
1994 return -1;
1995
1996 return stat_branch_pair(branch->refname, base, num_ours, num_theirs, abf);
1997 }
1998
1999 /*
2000 * Return true when there is anything to report, otherwise false.
2001 */
2002 int format_tracking_info(struct branch *branch, struct strbuf *sb,
2003 enum ahead_behind_flags abf)
2004 {
2005 int ours, theirs, sti;
2006 const char *full_base;
2007 char *base;
2008 int upstream_is_gone = 0;
2009
2010 sti = stat_tracking_info(branch, &ours, &theirs, &full_base, 0, abf);
2011 if (sti < 0) {
2012 if (!full_base)
2013 return 0;
2014 upstream_is_gone = 1;
2015 }
2016
2017 base = shorten_unambiguous_ref(full_base, 0);
2018 if (upstream_is_gone) {
2019 strbuf_addf(sb,
2020 _("Your branch is based on '%s', but the upstream is gone.\n"),
2021 base);
2022 if (advice_status_hints)
2023 strbuf_addstr(sb,
2024 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2025 } else if (!sti) {
2026 strbuf_addf(sb,
2027 _("Your branch is up to date with '%s'.\n"),
2028 base);
2029 } else if (abf == AHEAD_BEHIND_QUICK) {
2030 strbuf_addf(sb,
2031 _("Your branch and '%s' refer to different commits.\n"),
2032 base);
2033 if (advice_status_hints)
2034 strbuf_addf(sb, _(" (use \"%s\" for details)\n"),
2035 "git status --ahead-behind");
2036 } else if (!theirs) {
2037 strbuf_addf(sb,
2038 Q_("Your branch is ahead of '%s' by %d commit.\n",
2039 "Your branch is ahead of '%s' by %d commits.\n",
2040 ours),
2041 base, ours);
2042 if (advice_status_hints)
2043 strbuf_addstr(sb,
2044 _(" (use \"git push\" to publish your local commits)\n"));
2045 } else if (!ours) {
2046 strbuf_addf(sb,
2047 Q_("Your branch is behind '%s' by %d commit, "
2048 "and can be fast-forwarded.\n",
2049 "Your branch is behind '%s' by %d commits, "
2050 "and can be fast-forwarded.\n",
2051 theirs),
2052 base, theirs);
2053 if (advice_status_hints)
2054 strbuf_addstr(sb,
2055 _(" (use \"git pull\" to update your local branch)\n"));
2056 } else {
2057 strbuf_addf(sb,
2058 Q_("Your branch and '%s' have diverged,\n"
2059 "and have %d and %d different commit each, "
2060 "respectively.\n",
2061 "Your branch and '%s' have diverged,\n"
2062 "and have %d and %d different commits each, "
2063 "respectively.\n",
2064 ours + theirs),
2065 base, ours, theirs);
2066 if (advice_status_hints)
2067 strbuf_addstr(sb,
2068 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2069 }
2070 free(base);
2071 return 1;
2072 }
2073
2074 static int one_local_ref(const char *refname, const struct object_id *oid,
2075 int flag, void *cb_data)
2076 {
2077 struct ref ***local_tail = cb_data;
2078 struct ref *ref;
2079
2080 /* we already know it starts with refs/ to get here */
2081 if (check_refname_format(refname + 5, 0))
2082 return 0;
2083
2084 ref = alloc_ref(refname);
2085 oidcpy(&ref->new_oid, oid);
2086 **local_tail = ref;
2087 *local_tail = &ref->next;
2088 return 0;
2089 }
2090
2091 struct ref *get_local_heads(void)
2092 {
2093 struct ref *local_refs = NULL, **local_tail = &local_refs;
2094
2095 for_each_ref(one_local_ref, &local_tail);
2096 return local_refs;
2097 }
2098
2099 struct ref *guess_remote_head(const struct ref *head,
2100 const struct ref *refs,
2101 int all)
2102 {
2103 const struct ref *r;
2104 struct ref *list = NULL;
2105 struct ref **tail = &list;
2106
2107 if (!head)
2108 return NULL;
2109
2110 /*
2111 * Some transports support directly peeking at
2112 * where HEAD points; if that is the case, then
2113 * we don't have to guess.
2114 */
2115 if (head->symref)
2116 return copy_ref(find_ref_by_name(refs, head->symref));
2117
2118 /* If refs/heads/master could be right, it is. */
2119 if (!all) {
2120 r = find_ref_by_name(refs, "refs/heads/master");
2121 if (r && oideq(&r->old_oid, &head->old_oid))
2122 return copy_ref(r);
2123 }
2124
2125 /* Look for another ref that points there */
2126 for (r = refs; r; r = r->next) {
2127 if (r != head &&
2128 starts_with(r->name, "refs/heads/") &&
2129 oideq(&r->old_oid, &head->old_oid)) {
2130 *tail = copy_ref(r);
2131 tail = &((*tail)->next);
2132 if (!all)
2133 break;
2134 }
2135 }
2136
2137 return list;
2138 }
2139
2140 struct stale_heads_info {
2141 struct string_list *ref_names;
2142 struct ref **stale_refs_tail;
2143 struct refspec *rs;
2144 };
2145
2146 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2147 int flags, void *cb_data)
2148 {
2149 struct stale_heads_info *info = cb_data;
2150 struct string_list matches = STRING_LIST_INIT_DUP;
2151 struct refspec_item query;
2152 int i, stale = 1;
2153 memset(&query, 0, sizeof(struct refspec_item));
2154 query.dst = (char *)refname;
2155
2156 query_refspecs_multiple(info->rs, &query, &matches);
2157 if (matches.nr == 0)
2158 goto clean_exit; /* No matches */
2159
2160 /*
2161 * If we did find a suitable refspec and it's not a symref and
2162 * it's not in the list of refs that currently exist in that
2163 * remote, we consider it to be stale. In order to deal with
2164 * overlapping refspecs, we need to go over all of the
2165 * matching refs.
2166 */
2167 if (flags & REF_ISSYMREF)
2168 goto clean_exit;
2169
2170 for (i = 0; stale && i < matches.nr; i++)
2171 if (string_list_has_string(info->ref_names, matches.items[i].string))
2172 stale = 0;
2173
2174 if (stale) {
2175 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2176 oidcpy(&ref->new_oid, oid);
2177 }
2178
2179 clean_exit:
2180 string_list_clear(&matches, 0);
2181 return 0;
2182 }
2183
2184 struct ref *get_stale_heads(struct refspec *rs, struct ref *fetch_map)
2185 {
2186 struct ref *ref, *stale_refs = NULL;
2187 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2188 struct stale_heads_info info;
2189
2190 info.ref_names = &ref_names;
2191 info.stale_refs_tail = &stale_refs;
2192 info.rs = rs;
2193 for (ref = fetch_map; ref; ref = ref->next)
2194 string_list_append(&ref_names, ref->name);
2195 string_list_sort(&ref_names);
2196 for_each_ref(get_stale_heads_cb, &info);
2197 string_list_clear(&ref_names, 0);
2198 return stale_refs;
2199 }
2200
2201 /*
2202 * Compare-and-swap
2203 */
2204 static void clear_cas_option(struct push_cas_option *cas)
2205 {
2206 int i;
2207
2208 for (i = 0; i < cas->nr; i++)
2209 free(cas->entry[i].refname);
2210 free(cas->entry);
2211 memset(cas, 0, sizeof(*cas));
2212 }
2213
2214 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2215 const char *refname,
2216 size_t refnamelen)
2217 {
2218 struct push_cas *entry;
2219 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2220 entry = &cas->entry[cas->nr++];
2221 memset(entry, 0, sizeof(*entry));
2222 entry->refname = xmemdupz(refname, refnamelen);
2223 return entry;
2224 }
2225
2226 static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2227 {
2228 const char *colon;
2229 struct push_cas *entry;
2230
2231 if (unset) {
2232 /* "--no-<option>" */
2233 clear_cas_option(cas);
2234 return 0;
2235 }
2236
2237 if (!arg) {
2238 /* just "--<option>" */
2239 cas->use_tracking_for_rest = 1;
2240 return 0;
2241 }
2242
2243 /* "--<option>=refname" or "--<option>=refname:value" */
2244 colon = strchrnul(arg, ':');
2245 entry = add_cas_entry(cas, arg, colon - arg);
2246 if (!*colon)
2247 entry->use_tracking = 1;
2248 else if (!colon[1])
2249 oidclr(&entry->expect);
2250 else if (get_oid(colon + 1, &entry->expect))
2251 return error(_("cannot parse expected object name '%s'"),
2252 colon + 1);
2253 return 0;
2254 }
2255
2256 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2257 {
2258 return parse_push_cas_option(opt->value, arg, unset);
2259 }
2260
2261 int is_empty_cas(const struct push_cas_option *cas)
2262 {
2263 return !cas->use_tracking_for_rest && !cas->nr;
2264 }
2265
2266 /*
2267 * Look at remote.fetch refspec and see if we have a remote
2268 * tracking branch for the refname there. Fill its current
2269 * value in sha1[].
2270 * If we cannot do so, return negative to signal an error.
2271 */
2272 static int remote_tracking(struct remote *remote, const char *refname,
2273 struct object_id *oid)
2274 {
2275 char *dst;
2276
2277 dst = apply_refspecs(&remote->fetch, refname);
2278 if (!dst)
2279 return -1; /* no tracking ref for refname at remote */
2280 if (read_ref(dst, oid))
2281 return -1; /* we know what the tracking ref is but we cannot read it */
2282 return 0;
2283 }
2284
2285 static void apply_cas(struct push_cas_option *cas,
2286 struct remote *remote,
2287 struct ref *ref)
2288 {
2289 int i;
2290
2291 /* Find an explicit --<option>=<name>[:<value>] entry */
2292 for (i = 0; i < cas->nr; i++) {
2293 struct push_cas *entry = &cas->entry[i];
2294 if (!refname_match(entry->refname, ref->name))
2295 continue;
2296 ref->expect_old_sha1 = 1;
2297 if (!entry->use_tracking)
2298 oidcpy(&ref->old_oid_expect, &entry->expect);
2299 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2300 oidclr(&ref->old_oid_expect);
2301 return;
2302 }
2303
2304 /* Are we using "--<option>" to cover all? */
2305 if (!cas->use_tracking_for_rest)
2306 return;
2307
2308 ref->expect_old_sha1 = 1;
2309 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2310 oidclr(&ref->old_oid_expect);
2311 }
2312
2313 void apply_push_cas(struct push_cas_option *cas,
2314 struct remote *remote,
2315 struct ref *remote_refs)
2316 {
2317 struct ref *ref;
2318 for (ref = remote_refs; ref; ref = ref->next)
2319 apply_cas(cas, remote, ref);
2320 }
The Best VCS Around