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doc: git-remote fix ups
[git/debian.git] / remote.c
blob8be67f0892b47d0f31f9f1579c80ad6420721a7b
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 "strvec.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, size_t len)
178 {
179 struct branch *ret;
180 int i;
181
182 for (i = 0; i < branches_nr; i++) {
183 if (!strncmp(name, branches[i]->name, len) &&
184 !branches[i]->name[len])
185 return branches[i];
186 }
187
188 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
189 ret = xcalloc(1, sizeof(struct branch));
190 branches[branches_nr++] = ret;
191 ret->name = xstrndup(name, len);
192 ret->refname = xstrfmt("refs/heads/%s", ret->name);
193
194 return ret;
195 }
196
197 static struct rewrite *make_rewrite(struct rewrites *r,
198 const char *base, size_t len)
199 {
200 struct rewrite *ret;
201 int i;
202
203 for (i = 0; i < r->rewrite_nr; i++) {
204 if (len == r->rewrite[i]->baselen &&
205 !strncmp(base, r->rewrite[i]->base, len))
206 return r->rewrite[i];
207 }
208
209 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
210 ret = xcalloc(1, sizeof(struct rewrite));
211 r->rewrite[r->rewrite_nr++] = ret;
212 ret->base = xstrndup(base, len);
213 ret->baselen = len;
214 return ret;
215 }
216
217 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
218 {
219 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
220 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
221 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
222 rewrite->instead_of_nr++;
223 }
224
225 static const char *skip_spaces(const char *s)
226 {
227 while (isspace(*s))
228 s++;
229 return s;
230 }
231
232 static void read_remotes_file(struct remote *remote)
233 {
234 struct strbuf buf = STRBUF_INIT;
235 FILE *f = fopen_or_warn(git_path("remotes/%s", remote->name), "r");
236
237 if (!f)
238 return;
239 remote->configured_in_repo = 1;
240 remote->origin = REMOTE_REMOTES;
241 while (strbuf_getline(&buf, f) != EOF) {
242 const char *v;
243
244 strbuf_rtrim(&buf);
245
246 if (skip_prefix(buf.buf, "URL:", &v))
247 add_url_alias(remote, xstrdup(skip_spaces(v)));
248 else if (skip_prefix(buf.buf, "Push:", &v))
249 refspec_append(&remote->push, skip_spaces(v));
250 else if (skip_prefix(buf.buf, "Pull:", &v))
251 refspec_append(&remote->fetch, skip_spaces(v));
252 }
253 strbuf_release(&buf);
254 fclose(f);
255 }
256
257 static void read_branches_file(struct remote *remote)
258 {
259 char *frag;
260 struct strbuf buf = STRBUF_INIT;
261 FILE *f = fopen_or_warn(git_path("branches/%s", remote->name), "r");
262
263 if (!f)
264 return;
265
266 strbuf_getline_lf(&buf, f);
267 fclose(f);
268 strbuf_trim(&buf);
269 if (!buf.len) {
270 strbuf_release(&buf);
271 return;
272 }
273
274 remote->configured_in_repo = 1;
275 remote->origin = REMOTE_BRANCHES;
276
277 /*
278 * The branches file would have URL and optionally
279 * #branch specified. The default (or specified) branch is
280 * fetched and stored in the local branch matching the
281 * remote name.
282 */
283 frag = strchr(buf.buf, '#');
284 if (frag)
285 *(frag++) = '\0';
286 else
287 frag = (char *)git_default_branch_name();
288
289 add_url_alias(remote, strbuf_detach(&buf, NULL));
290 refspec_appendf(&remote->fetch, "refs/heads/%s:refs/heads/%s",
291 frag, remote->name);
292
293 /*
294 * Cogito compatible push: push current HEAD to remote #branch
295 * (master if missing)
296 */
297 refspec_appendf(&remote->push, "HEAD:refs/heads/%s", frag);
298 remote->fetch_tags = 1; /* always auto-follow */
299 }
300
301 static int handle_config(const char *key, const char *value, void *cb)
302 {
303 const char *name;
304 size_t namelen;
305 const char *subkey;
306 struct remote *remote;
307 struct branch *branch;
308 if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
309 if (!name)
310 return 0;
311 branch = make_branch(name, namelen);
312 if (!strcmp(subkey, "remote")) {
313 return git_config_string(&branch->remote_name, key, value);
314 } else if (!strcmp(subkey, "pushremote")) {
315 return git_config_string(&branch->pushremote_name, key, value);
316 } else if (!strcmp(subkey, "merge")) {
317 if (!value)
318 return config_error_nonbool(key);
319 add_merge(branch, xstrdup(value));
320 }
321 return 0;
322 }
323 if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
324 struct rewrite *rewrite;
325 if (!name)
326 return 0;
327 if (!strcmp(subkey, "insteadof")) {
328 if (!value)
329 return config_error_nonbool(key);
330 rewrite = make_rewrite(&rewrites, name, namelen);
331 add_instead_of(rewrite, xstrdup(value));
332 } else if (!strcmp(subkey, "pushinsteadof")) {
333 if (!value)
334 return config_error_nonbool(key);
335 rewrite = make_rewrite(&rewrites_push, name, namelen);
336 add_instead_of(rewrite, xstrdup(value));
337 }
338 }
339
340 if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
341 return 0;
342
343 /* Handle remote.* variables */
344 if (!name && !strcmp(subkey, "pushdefault"))
345 return git_config_string(&pushremote_name, key, value);
346
347 if (!name)
348 return 0;
349 /* Handle remote.<name>.* variables */
350 if (*name == '/') {
351 warning(_("config remote shorthand cannot begin with '/': %s"),
352 name);
353 return 0;
354 }
355 remote = make_remote(name, namelen);
356 remote->origin = REMOTE_CONFIG;
357 if (current_config_scope() == CONFIG_SCOPE_LOCAL ||
358 current_config_scope() == CONFIG_SCOPE_WORKTREE)
359 remote->configured_in_repo = 1;
360 if (!strcmp(subkey, "mirror"))
361 remote->mirror = git_config_bool(key, value);
362 else if (!strcmp(subkey, "skipdefaultupdate"))
363 remote->skip_default_update = git_config_bool(key, value);
364 else if (!strcmp(subkey, "skipfetchall"))
365 remote->skip_default_update = git_config_bool(key, value);
366 else if (!strcmp(subkey, "prune"))
367 remote->prune = git_config_bool(key, value);
368 else if (!strcmp(subkey, "prunetags"))
369 remote->prune_tags = git_config_bool(key, value);
370 else if (!strcmp(subkey, "url")) {
371 const char *v;
372 if (git_config_string(&v, key, value))
373 return -1;
374 add_url(remote, v);
375 } else if (!strcmp(subkey, "pushurl")) {
376 const char *v;
377 if (git_config_string(&v, key, value))
378 return -1;
379 add_pushurl(remote, v);
380 } else if (!strcmp(subkey, "push")) {
381 const char *v;
382 if (git_config_string(&v, key, value))
383 return -1;
384 refspec_append(&remote->push, v);
385 free((char *)v);
386 } else if (!strcmp(subkey, "fetch")) {
387 const char *v;
388 if (git_config_string(&v, key, value))
389 return -1;
390 refspec_append(&remote->fetch, v);
391 free((char *)v);
392 } else if (!strcmp(subkey, "receivepack")) {
393 const char *v;
394 if (git_config_string(&v, key, value))
395 return -1;
396 if (!remote->receivepack)
397 remote->receivepack = v;
398 else
399 error(_("more than one receivepack given, using the first"));
400 } else if (!strcmp(subkey, "uploadpack")) {
401 const char *v;
402 if (git_config_string(&v, key, value))
403 return -1;
404 if (!remote->uploadpack)
405 remote->uploadpack = v;
406 else
407 error(_("more than one uploadpack given, using the first"));
408 } else if (!strcmp(subkey, "tagopt")) {
409 if (!strcmp(value, "--no-tags"))
410 remote->fetch_tags = -1;
411 else if (!strcmp(value, "--tags"))
412 remote->fetch_tags = 2;
413 } else if (!strcmp(subkey, "proxy")) {
414 return git_config_string((const char **)&remote->http_proxy,
415 key, value);
416 } else if (!strcmp(subkey, "proxyauthmethod")) {
417 return git_config_string((const char **)&remote->http_proxy_authmethod,
418 key, value);
419 } else if (!strcmp(subkey, "vcs")) {
420 return git_config_string(&remote->foreign_vcs, key, value);
421 }
422 return 0;
423 }
424
425 static void alias_all_urls(void)
426 {
427 int i, j;
428 for (i = 0; i < remotes_nr; i++) {
429 int add_pushurl_aliases;
430 if (!remotes[i])
431 continue;
432 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
433 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
434 }
435 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
436 for (j = 0; j < remotes[i]->url_nr; j++) {
437 if (add_pushurl_aliases)
438 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
439 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
440 }
441 }
442 }
443
444 static void read_config(void)
445 {
446 static int loaded;
447 int flag;
448
449 if (loaded)
450 return;
451 loaded = 1;
452
453 current_branch = NULL;
454 if (startup_info->have_repository) {
455 const char *head_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flag);
456 if (head_ref && (flag & REF_ISSYMREF) &&
457 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
458 current_branch = make_branch(head_ref, strlen(head_ref));
459 }
460 }
461 git_config(handle_config, NULL);
462 alias_all_urls();
463 }
464
465 static int valid_remote_nick(const char *name)
466 {
467 if (!name[0] || is_dot_or_dotdot(name))
468 return 0;
469
470 /* remote nicknames cannot contain slashes */
471 while (*name)
472 if (is_dir_sep(*name++))
473 return 0;
474 return 1;
475 }
476
477 const char *remote_for_branch(struct branch *branch, int *explicit)
478 {
479 if (branch && branch->remote_name) {
480 if (explicit)
481 *explicit = 1;
482 return branch->remote_name;
483 }
484 if (explicit)
485 *explicit = 0;
486 return "origin";
487 }
488
489 const char *pushremote_for_branch(struct branch *branch, int *explicit)
490 {
491 if (branch && branch->pushremote_name) {
492 if (explicit)
493 *explicit = 1;
494 return branch->pushremote_name;
495 }
496 if (pushremote_name) {
497 if (explicit)
498 *explicit = 1;
499 return pushremote_name;
500 }
501 return remote_for_branch(branch, explicit);
502 }
503
504 const char *remote_ref_for_branch(struct branch *branch, int for_push)
505 {
506 if (branch) {
507 if (!for_push) {
508 if (branch->merge_nr) {
509 return branch->merge_name[0];
510 }
511 } else {
512 const char *dst, *remote_name =
513 pushremote_for_branch(branch, NULL);
514 struct remote *remote = remote_get(remote_name);
515
516 if (remote && remote->push.nr &&
517 (dst = apply_refspecs(&remote->push,
518 branch->refname))) {
519 return dst;
520 }
521 }
522 }
523 return NULL;
524 }
525
526 static struct remote *remote_get_1(const char *name,
527 const char *(*get_default)(struct branch *, int *))
528 {
529 struct remote *ret;
530 int name_given = 0;
531
532 read_config();
533
534 if (name)
535 name_given = 1;
536 else
537 name = get_default(current_branch, &name_given);
538
539 ret = make_remote(name, 0);
540 if (valid_remote_nick(name) && have_git_dir()) {
541 if (!valid_remote(ret))
542 read_remotes_file(ret);
543 if (!valid_remote(ret))
544 read_branches_file(ret);
545 }
546 if (name_given && !valid_remote(ret))
547 add_url_alias(ret, name);
548 if (!valid_remote(ret))
549 return NULL;
550 return ret;
551 }
552
553 struct remote *remote_get(const char *name)
554 {
555 return remote_get_1(name, remote_for_branch);
556 }
557
558 struct remote *pushremote_get(const char *name)
559 {
560 return remote_get_1(name, pushremote_for_branch);
561 }
562
563 int remote_is_configured(struct remote *remote, int in_repo)
564 {
565 if (!remote)
566 return 0;
567 if (in_repo)
568 return remote->configured_in_repo;
569 return !!remote->origin;
570 }
571
572 int for_each_remote(each_remote_fn fn, void *priv)
573 {
574 int i, result = 0;
575 read_config();
576 for (i = 0; i < remotes_nr && !result; i++) {
577 struct remote *r = remotes[i];
578 if (!r)
579 continue;
580 result = fn(r, priv);
581 }
582 return result;
583 }
584
585 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
586 {
587 if (strcmp(ref1->name, ref2->name)) {
588 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
589 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
590 die(_("Cannot fetch both %s and %s to %s"),
591 ref1->name, ref2->name, ref2->peer_ref->name);
592 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
593 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
594 warning(_("%s usually tracks %s, not %s"),
595 ref2->peer_ref->name, ref2->name, ref1->name);
596 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
597 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
598 die(_("%s tracks both %s and %s"),
599 ref2->peer_ref->name, ref1->name, ref2->name);
600 } else {
601 /*
602 * This last possibility doesn't occur because
603 * FETCH_HEAD_IGNORE entries always appear at
604 * the end of the list.
605 */
606 BUG("Internal error");
607 }
608 }
609 free(ref2->peer_ref);
610 free(ref2);
611 }
612
613 struct ref *ref_remove_duplicates(struct ref *ref_map)
614 {
615 struct string_list refs = STRING_LIST_INIT_NODUP;
616 struct ref *retval = NULL;
617 struct ref **p = &retval;
618
619 while (ref_map) {
620 struct ref *ref = ref_map;
621
622 ref_map = ref_map->next;
623 ref->next = NULL;
624
625 if (!ref->peer_ref) {
626 *p = ref;
627 p = &ref->next;
628 } else {
629 struct string_list_item *item =
630 string_list_insert(&refs, ref->peer_ref->name);
631
632 if (item->util) {
633 /* Entry already existed */
634 handle_duplicate((struct ref *)item->util, ref);
635 } else {
636 *p = ref;
637 p = &ref->next;
638 item->util = ref;
639 }
640 }
641 }
642
643 string_list_clear(&refs, 0);
644 return retval;
645 }
646
647 int remote_has_url(struct remote *remote, const char *url)
648 {
649 int i;
650 for (i = 0; i < remote->url_nr; i++) {
651 if (!strcmp(remote->url[i], url))
652 return 1;
653 }
654 return 0;
655 }
656
657 static int match_name_with_pattern(const char *key, const char *name,
658 const char *value, char **result)
659 {
660 const char *kstar = strchr(key, '*');
661 size_t klen;
662 size_t ksuffixlen;
663 size_t namelen;
664 int ret;
665 if (!kstar)
666 die(_("key '%s' of pattern had no '*'"), key);
667 klen = kstar - key;
668 ksuffixlen = strlen(kstar + 1);
669 namelen = strlen(name);
670 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
671 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
672 if (ret && value) {
673 struct strbuf sb = STRBUF_INIT;
674 const char *vstar = strchr(value, '*');
675 if (!vstar)
676 die(_("value '%s' of pattern has no '*'"), value);
677 strbuf_add(&sb, value, vstar - value);
678 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
679 strbuf_addstr(&sb, vstar + 1);
680 *result = strbuf_detach(&sb, NULL);
681 }
682 return ret;
683 }
684
685 static int refspec_match(const struct refspec_item *refspec,
686 const char *name)
687 {
688 if (refspec->pattern)
689 return match_name_with_pattern(refspec->src, name, NULL, NULL);
690
691 return !strcmp(refspec->src, name);
692 }
693
694 static int omit_name_by_refspec(const char *name, struct refspec *rs)
695 {
696 int i;
697
698 for (i = 0; i < rs->nr; i++) {
699 if (rs->items[i].negative && refspec_match(&rs->items[i], name))
700 return 1;
701 }
702 return 0;
703 }
704
705 struct ref *apply_negative_refspecs(struct ref *ref_map, struct refspec *rs)
706 {
707 struct ref **tail;
708
709 for (tail = &ref_map; *tail; ) {
710 struct ref *ref = *tail;
711
712 if (omit_name_by_refspec(ref->name, rs)) {
713 *tail = ref->next;
714 free(ref->peer_ref);
715 free(ref);
716 } else
717 tail = &ref->next;
718 }
719
720 return ref_map;
721 }
722
723 static int query_matches_negative_refspec(struct refspec *rs, struct refspec_item *query)
724 {
725 int i, matched_negative = 0;
726 int find_src = !query->src;
727 struct string_list reversed = STRING_LIST_INIT_NODUP;
728 const char *needle = find_src ? query->dst : query->src;
729
730 /*
731 * Check whether the queried ref matches any negative refpsec. If so,
732 * then we should ultimately treat this as not matching the query at
733 * all.
734 *
735 * Note that negative refspecs always match the source, but the query
736 * item uses the destination. To handle this, we apply pattern
737 * refspecs in reverse to figure out if the query source matches any
738 * of the negative refspecs.
739 */
740 for (i = 0; i < rs->nr; i++) {
741 struct refspec_item *refspec = &rs->items[i];
742 char *expn_name;
743
744 if (refspec->negative)
745 continue;
746
747 /* Note the reversal of src and dst */
748 if (refspec->pattern) {
749 const char *key = refspec->dst ? refspec->dst : refspec->src;
750 const char *value = refspec->src;
751
752 if (match_name_with_pattern(key, needle, value, &expn_name))
753 string_list_append_nodup(&reversed, expn_name);
754 } else {
755 if (!strcmp(needle, refspec->src))
756 string_list_append(&reversed, refspec->src);
757 }
758 }
759
760 for (i = 0; !matched_negative && i < reversed.nr; i++) {
761 if (omit_name_by_refspec(reversed.items[i].string, rs))
762 matched_negative = 1;
763 }
764
765 string_list_clear(&reversed, 0);
766
767 return matched_negative;
768 }
769
770 static void query_refspecs_multiple(struct refspec *rs,
771 struct refspec_item *query,
772 struct string_list *results)
773 {
774 int i;
775 int find_src = !query->src;
776
777 if (find_src && !query->dst)
778 BUG("query_refspecs_multiple: need either src or dst");
779
780 if (query_matches_negative_refspec(rs, query))
781 return;
782
783 for (i = 0; i < rs->nr; i++) {
784 struct refspec_item *refspec = &rs->items[i];
785 const char *key = find_src ? refspec->dst : refspec->src;
786 const char *value = find_src ? refspec->src : refspec->dst;
787 const char *needle = find_src ? query->dst : query->src;
788 char **result = find_src ? &query->src : &query->dst;
789
790 if (!refspec->dst || refspec->negative)
791 continue;
792 if (refspec->pattern) {
793 if (match_name_with_pattern(key, needle, value, result))
794 string_list_append_nodup(results, *result);
795 } else if (!strcmp(needle, key)) {
796 string_list_append(results, value);
797 }
798 }
799 }
800
801 int query_refspecs(struct refspec *rs, struct refspec_item *query)
802 {
803 int i;
804 int find_src = !query->src;
805 const char *needle = find_src ? query->dst : query->src;
806 char **result = find_src ? &query->src : &query->dst;
807
808 if (find_src && !query->dst)
809 BUG("query_refspecs: need either src or dst");
810
811 if (query_matches_negative_refspec(rs, query))
812 return -1;
813
814 for (i = 0; i < rs->nr; i++) {
815 struct refspec_item *refspec = &rs->items[i];
816 const char *key = find_src ? refspec->dst : refspec->src;
817 const char *value = find_src ? refspec->src : refspec->dst;
818
819 if (!refspec->dst || refspec->negative)
820 continue;
821 if (refspec->pattern) {
822 if (match_name_with_pattern(key, needle, value, result)) {
823 query->force = refspec->force;
824 return 0;
825 }
826 } else if (!strcmp(needle, key)) {
827 *result = xstrdup(value);
828 query->force = refspec->force;
829 return 0;
830 }
831 }
832 return -1;
833 }
834
835 char *apply_refspecs(struct refspec *rs, const char *name)
836 {
837 struct refspec_item query;
838
839 memset(&query, 0, sizeof(struct refspec_item));
840 query.src = (char *)name;
841
842 if (query_refspecs(rs, &query))
843 return NULL;
844
845 return query.dst;
846 }
847
848 int remote_find_tracking(struct remote *remote, struct refspec_item *refspec)
849 {
850 return query_refspecs(&remote->fetch, refspec);
851 }
852
853 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
854 const char *name)
855 {
856 size_t len = strlen(name);
857 struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
858 memcpy(ref->name, prefix, prefixlen);
859 memcpy(ref->name + prefixlen, name, len);
860 return ref;
861 }
862
863 struct ref *alloc_ref(const char *name)
864 {
865 return alloc_ref_with_prefix("", 0, name);
866 }
867
868 struct ref *copy_ref(const struct ref *ref)
869 {
870 struct ref *cpy;
871 size_t len;
872 if (!ref)
873 return NULL;
874 len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
875 cpy = xmalloc(len);
876 memcpy(cpy, ref, len);
877 cpy->next = NULL;
878 cpy->symref = xstrdup_or_null(ref->symref);
879 cpy->remote_status = xstrdup_or_null(ref->remote_status);
880 cpy->peer_ref = copy_ref(ref->peer_ref);
881 return cpy;
882 }
883
884 struct ref *copy_ref_list(const struct ref *ref)
885 {
886 struct ref *ret = NULL;
887 struct ref **tail = &ret;
888 while (ref) {
889 *tail = copy_ref(ref);
890 ref = ref->next;
891 tail = &((*tail)->next);
892 }
893 return ret;
894 }
895
896 void free_one_ref(struct ref *ref)
897 {
898 if (!ref)
899 return;
900 free_one_ref(ref->peer_ref);
901 free(ref->remote_status);
902 free(ref->symref);
903 free(ref);
904 }
905
906 void free_refs(struct ref *ref)
907 {
908 struct ref *next;
909 while (ref) {
910 next = ref->next;
911 free_one_ref(ref);
912 ref = next;
913 }
914 }
915
916 int ref_compare_name(const void *va, const void *vb)
917 {
918 const struct ref *a = va, *b = vb;
919 return strcmp(a->name, b->name);
920 }
921
922 static void *ref_list_get_next(const void *a)
923 {
924 return ((const struct ref *)a)->next;
925 }
926
927 static void ref_list_set_next(void *a, void *next)
928 {
929 ((struct ref *)a)->next = next;
930 }
931
932 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
933 {
934 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
935 }
936
937 int count_refspec_match(const char *pattern,
938 struct ref *refs,
939 struct ref **matched_ref)
940 {
941 int patlen = strlen(pattern);
942 struct ref *matched_weak = NULL;
943 struct ref *matched = NULL;
944 int weak_match = 0;
945 int match = 0;
946
947 for (weak_match = match = 0; refs; refs = refs->next) {
948 char *name = refs->name;
949 int namelen = strlen(name);
950
951 if (!refname_match(pattern, name))
952 continue;
953
954 /* A match is "weak" if it is with refs outside
955 * heads or tags, and did not specify the pattern
956 * in full (e.g. "refs/remotes/origin/master") or at
957 * least from the toplevel (e.g. "remotes/origin/master");
958 * otherwise "git push $URL master" would result in
959 * ambiguity between remotes/origin/master and heads/master
960 * at the remote site.
961 */
962 if (namelen != patlen &&
963 patlen != namelen - 5 &&
964 !starts_with(name, "refs/heads/") &&
965 !starts_with(name, "refs/tags/")) {
966 /* We want to catch the case where only weak
967 * matches are found and there are multiple
968 * matches, and where more than one strong
969 * matches are found, as ambiguous. One
970 * strong match with zero or more weak matches
971 * are acceptable as a unique match.
972 */
973 matched_weak = refs;
974 weak_match++;
975 }
976 else {
977 matched = refs;
978 match++;
979 }
980 }
981 if (!matched) {
982 if (matched_ref)
983 *matched_ref = matched_weak;
984 return weak_match;
985 }
986 else {
987 if (matched_ref)
988 *matched_ref = matched;
989 return match;
990 }
991 }
992
993 static void tail_link_ref(struct ref *ref, struct ref ***tail)
994 {
995 **tail = ref;
996 while (ref->next)
997 ref = ref->next;
998 *tail = &ref->next;
999 }
1000
1001 static struct ref *alloc_delete_ref(void)
1002 {
1003 struct ref *ref = alloc_ref("(delete)");
1004 oidclr(&ref->new_oid);
1005 return ref;
1006 }
1007
1008 static int try_explicit_object_name(const char *name,
1009 struct ref **match)
1010 {
1011 struct object_id oid;
1012
1013 if (!*name) {
1014 if (match)
1015 *match = alloc_delete_ref();
1016 return 0;
1017 }
1018
1019 if (get_oid(name, &oid))
1020 return -1;
1021
1022 if (match) {
1023 *match = alloc_ref(name);
1024 oidcpy(&(*match)->new_oid, &oid);
1025 }
1026 return 0;
1027 }
1028
1029 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1030 {
1031 struct ref *ret = alloc_ref(name);
1032 tail_link_ref(ret, tail);
1033 return ret;
1034 }
1035
1036 static char *guess_ref(const char *name, struct ref *peer)
1037 {
1038 struct strbuf buf = STRBUF_INIT;
1039
1040 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1041 NULL, NULL);
1042 if (!r)
1043 return NULL;
1044
1045 if (starts_with(r, "refs/heads/")) {
1046 strbuf_addstr(&buf, "refs/heads/");
1047 } else if (starts_with(r, "refs/tags/")) {
1048 strbuf_addstr(&buf, "refs/tags/");
1049 } else {
1050 return NULL;
1051 }
1052
1053 strbuf_addstr(&buf, name);
1054 return strbuf_detach(&buf, NULL);
1055 }
1056
1057 static int match_explicit_lhs(struct ref *src,
1058 struct refspec_item *rs,
1059 struct ref **match,
1060 int *allocated_match)
1061 {
1062 switch (count_refspec_match(rs->src, src, match)) {
1063 case 1:
1064 if (allocated_match)
1065 *allocated_match = 0;
1066 return 0;
1067 case 0:
1068 /* The source could be in the get_sha1() format
1069 * not a reference name. :refs/other is a
1070 * way to delete 'other' ref at the remote end.
1071 */
1072 if (try_explicit_object_name(rs->src, match) < 0)
1073 return error(_("src refspec %s does not match any"), rs->src);
1074 if (allocated_match)
1075 *allocated_match = 1;
1076 return 0;
1077 default:
1078 return error(_("src refspec %s matches more than one"), rs->src);
1079 }
1080 }
1081
1082 static void show_push_unqualified_ref_name_error(const char *dst_value,
1083 const char *matched_src_name)
1084 {
1085 struct object_id oid;
1086 enum object_type type;
1087
1088 /*
1089 * TRANSLATORS: "matches '%s'%" is the <dst> part of "git push
1090 * <remote> <src>:<dst>" push, and "being pushed ('%s')" is
1091 * the <src>.
1092 */
1093 error(_("The destination you provided is not a full refname (i.e.,\n"
1094 "starting with \"refs/\"). We tried to guess what you meant by:\n"
1095 "\n"
1096 "- Looking for a ref that matches '%s' on the remote side.\n"
1097 "- Checking if the <src> being pushed ('%s')\n"
1098 " is a ref in \"refs/{heads,tags}/\". If so we add a corresponding\n"
1099 " refs/{heads,tags}/ prefix on the remote side.\n"
1100 "\n"
1101 "Neither worked, so we gave up. You must fully qualify the ref."),
1102 dst_value, matched_src_name);
1103
1104 if (!advice_push_unqualified_ref_name)
1105 return;
1106
1107 if (get_oid(matched_src_name, &oid))
1108 BUG("'%s' is not a valid object, "
1109 "match_explicit_lhs() should catch this!",
1110 matched_src_name);
1111 type = oid_object_info(the_repository, &oid, NULL);
1112 if (type == OBJ_COMMIT) {
1113 advise(_("The <src> part of the refspec is a commit object.\n"
1114 "Did you mean to create a new branch by pushing to\n"
1115 "'%s:refs/heads/%s'?"),
1116 matched_src_name, dst_value);
1117 } else if (type == OBJ_TAG) {
1118 advise(_("The <src> part of the refspec is a tag object.\n"
1119 "Did you mean to create a new tag by pushing to\n"
1120 "'%s:refs/tags/%s'?"),
1121 matched_src_name, dst_value);
1122 } else if (type == OBJ_TREE) {
1123 advise(_("The <src> part of the refspec is a tree object.\n"
1124 "Did you mean to tag a new tree by pushing to\n"
1125 "'%s:refs/tags/%s'?"),
1126 matched_src_name, dst_value);
1127 } else if (type == OBJ_BLOB) {
1128 advise(_("The <src> part of the refspec is a blob object.\n"
1129 "Did you mean to tag a new blob by pushing to\n"
1130 "'%s:refs/tags/%s'?"),
1131 matched_src_name, dst_value);
1132 } else {
1133 BUG("'%s' should be commit/tag/tree/blob, is '%d'",
1134 matched_src_name, type);
1135 }
1136 }
1137
1138 static int match_explicit(struct ref *src, struct ref *dst,
1139 struct ref ***dst_tail,
1140 struct refspec_item *rs)
1141 {
1142 struct ref *matched_src, *matched_dst;
1143 int allocated_src;
1144
1145 const char *dst_value = rs->dst;
1146 char *dst_guess;
1147
1148 if (rs->pattern || rs->matching || rs->negative)
1149 return 0;
1150
1151 matched_src = matched_dst = NULL;
1152 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1153 return -1;
1154
1155 if (!dst_value) {
1156 int flag;
1157
1158 dst_value = resolve_ref_unsafe(matched_src->name,
1159 RESOLVE_REF_READING,
1160 NULL, &flag);
1161 if (!dst_value ||
1162 ((flag & REF_ISSYMREF) &&
1163 !starts_with(dst_value, "refs/heads/")))
1164 die(_("%s cannot be resolved to branch"),
1165 matched_src->name);
1166 }
1167
1168 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1169 case 1:
1170 break;
1171 case 0:
1172 if (starts_with(dst_value, "refs/")) {
1173 matched_dst = make_linked_ref(dst_value, dst_tail);
1174 } else if (is_null_oid(&matched_src->new_oid)) {
1175 error(_("unable to delete '%s': remote ref does not exist"),
1176 dst_value);
1177 } else if ((dst_guess = guess_ref(dst_value, matched_src))) {
1178 matched_dst = make_linked_ref(dst_guess, dst_tail);
1179 free(dst_guess);
1180 } else {
1181 show_push_unqualified_ref_name_error(dst_value,
1182 matched_src->name);
1183 }
1184 break;
1185 default:
1186 matched_dst = NULL;
1187 error(_("dst refspec %s matches more than one"),
1188 dst_value);
1189 break;
1190 }
1191 if (!matched_dst)
1192 return -1;
1193 if (matched_dst->peer_ref)
1194 return error(_("dst ref %s receives from more than one src"),
1195 matched_dst->name);
1196 else {
1197 matched_dst->peer_ref = allocated_src ?
1198 matched_src :
1199 copy_ref(matched_src);
1200 matched_dst->force = rs->force;
1201 }
1202 return 0;
1203 }
1204
1205 static int match_explicit_refs(struct ref *src, struct ref *dst,
1206 struct ref ***dst_tail, struct refspec *rs)
1207 {
1208 int i, errs;
1209 for (i = errs = 0; i < rs->nr; i++)
1210 errs += match_explicit(src, dst, dst_tail, &rs->items[i]);
1211 return errs;
1212 }
1213
1214 static char *get_ref_match(const struct refspec *rs, const struct ref *ref,
1215 int send_mirror, int direction,
1216 const struct refspec_item **ret_pat)
1217 {
1218 const struct refspec_item *pat;
1219 char *name;
1220 int i;
1221 int matching_refs = -1;
1222 for (i = 0; i < rs->nr; i++) {
1223 const struct refspec_item *item = &rs->items[i];
1224
1225 if (item->negative)
1226 continue;
1227
1228 if (item->matching &&
1229 (matching_refs == -1 || item->force)) {
1230 matching_refs = i;
1231 continue;
1232 }
1233
1234 if (item->pattern) {
1235 const char *dst_side = item->dst ? item->dst : item->src;
1236 int match;
1237 if (direction == FROM_SRC)
1238 match = match_name_with_pattern(item->src, ref->name, dst_side, &name);
1239 else
1240 match = match_name_with_pattern(dst_side, ref->name, item->src, &name);
1241 if (match) {
1242 matching_refs = i;
1243 break;
1244 }
1245 }
1246 }
1247 if (matching_refs == -1)
1248 return NULL;
1249
1250 pat = &rs->items[matching_refs];
1251 if (pat->matching) {
1252 /*
1253 * "matching refs"; traditionally we pushed everything
1254 * including refs outside refs/heads/ hierarchy, but
1255 * that does not make much sense these days.
1256 */
1257 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1258 return NULL;
1259 name = xstrdup(ref->name);
1260 }
1261 if (ret_pat)
1262 *ret_pat = pat;
1263 return name;
1264 }
1265
1266 static struct ref **tail_ref(struct ref **head)
1267 {
1268 struct ref **tail = head;
1269 while (*tail)
1270 tail = &((*tail)->next);
1271 return tail;
1272 }
1273
1274 struct tips {
1275 struct commit **tip;
1276 int nr, alloc;
1277 };
1278
1279 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1280 {
1281 struct commit *commit;
1282
1283 if (is_null_oid(oid))
1284 return;
1285 commit = lookup_commit_reference_gently(the_repository, oid, 1);
1286 if (!commit || (commit->object.flags & TMP_MARK))
1287 return;
1288 commit->object.flags |= TMP_MARK;
1289 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1290 tips->tip[tips->nr++] = commit;
1291 }
1292
1293 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1294 {
1295 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1296 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1297 struct string_list_item *item;
1298 struct ref *ref;
1299 struct tips sent_tips;
1300
1301 /*
1302 * Collect everything we know they would have at the end of
1303 * this push, and collect all tags they have.
1304 */
1305 memset(&sent_tips, 0, sizeof(sent_tips));
1306 for (ref = *dst; ref; ref = ref->next) {
1307 if (ref->peer_ref &&
1308 !is_null_oid(&ref->peer_ref->new_oid))
1309 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1310 else
1311 add_to_tips(&sent_tips, &ref->old_oid);
1312 if (starts_with(ref->name, "refs/tags/"))
1313 string_list_append(&dst_tag, ref->name);
1314 }
1315 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1316
1317 string_list_sort(&dst_tag);
1318
1319 /* Collect tags they do not have. */
1320 for (ref = src; ref; ref = ref->next) {
1321 if (!starts_with(ref->name, "refs/tags/"))
1322 continue; /* not a tag */
1323 if (string_list_has_string(&dst_tag, ref->name))
1324 continue; /* they already have it */
1325 if (oid_object_info(the_repository, &ref->new_oid, NULL) != OBJ_TAG)
1326 continue; /* be conservative */
1327 item = string_list_append(&src_tag, ref->name);
1328 item->util = ref;
1329 }
1330 string_list_clear(&dst_tag, 0);
1331
1332 /*
1333 * At this point, src_tag lists tags that are missing from
1334 * dst, and sent_tips lists the tips we are pushing or those
1335 * that we know they already have. An element in the src_tag
1336 * that is an ancestor of any of the sent_tips needs to be
1337 * sent to the other side.
1338 */
1339 if (sent_tips.nr) {
1340 const int reachable_flag = 1;
1341 struct commit_list *found_commits;
1342 struct commit **src_commits;
1343 int nr_src_commits = 0, alloc_src_commits = 16;
1344 ALLOC_ARRAY(src_commits, alloc_src_commits);
1345
1346 for_each_string_list_item(item, &src_tag) {
1347 struct ref *ref = item->util;
1348 struct commit *commit;
1349
1350 if (is_null_oid(&ref->new_oid))
1351 continue;
1352 commit = lookup_commit_reference_gently(the_repository,
1353 &ref->new_oid,
1354 1);
1355 if (!commit)
1356 /* not pushing a commit, which is not an error */
1357 continue;
1358
1359 ALLOC_GROW(src_commits, nr_src_commits + 1, alloc_src_commits);
1360 src_commits[nr_src_commits++] = commit;
1361 }
1362
1363 found_commits = get_reachable_subset(sent_tips.tip, sent_tips.nr,
1364 src_commits, nr_src_commits,
1365 reachable_flag);
1366
1367 for_each_string_list_item(item, &src_tag) {
1368 struct ref *dst_ref;
1369 struct ref *ref = item->util;
1370 struct commit *commit;
1371
1372 if (is_null_oid(&ref->new_oid))
1373 continue;
1374 commit = lookup_commit_reference_gently(the_repository,
1375 &ref->new_oid,
1376 1);
1377 if (!commit)
1378 /* not pushing a commit, which is not an error */
1379 continue;
1380
1381 /*
1382 * Is this tag, which they do not have, reachable from
1383 * any of the commits we are sending?
1384 */
1385 if (!(commit->object.flags & reachable_flag))
1386 continue;
1387
1388 /* Add it in */
1389 dst_ref = make_linked_ref(ref->name, dst_tail);
1390 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1391 dst_ref->peer_ref = copy_ref(ref);
1392 }
1393
1394 clear_commit_marks_many(nr_src_commits, src_commits, reachable_flag);
1395 free(src_commits);
1396 free_commit_list(found_commits);
1397 }
1398
1399 string_list_clear(&src_tag, 0);
1400 free(sent_tips.tip);
1401 }
1402
1403 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1404 {
1405 for ( ; list; list = list->next)
1406 if (!strcmp(list->name, name))
1407 return (struct ref *)list;
1408 return NULL;
1409 }
1410
1411 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1412 {
1413 for ( ; ref; ref = ref->next)
1414 string_list_append_nodup(ref_index, ref->name)->util = ref;
1415
1416 string_list_sort(ref_index);
1417 }
1418
1419 /*
1420 * Given only the set of local refs, sanity-check the set of push
1421 * refspecs. We can't catch all errors that match_push_refs would,
1422 * but we can catch some errors early before even talking to the
1423 * remote side.
1424 */
1425 int check_push_refs(struct ref *src, struct refspec *rs)
1426 {
1427 int ret = 0;
1428 int i;
1429
1430 for (i = 0; i < rs->nr; i++) {
1431 struct refspec_item *item = &rs->items[i];
1432
1433 if (item->pattern || item->matching || item->negative)
1434 continue;
1435
1436 ret |= match_explicit_lhs(src, item, NULL, NULL);
1437 }
1438
1439 return ret;
1440 }
1441
1442 /*
1443 * Given the set of refs the local repository has, the set of refs the
1444 * remote repository has, and the refspec used for push, determine
1445 * what remote refs we will update and with what value by setting
1446 * peer_ref (which object is being pushed) and force (if the push is
1447 * forced) in elements of "dst". The function may add new elements to
1448 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1449 */
1450 int match_push_refs(struct ref *src, struct ref **dst,
1451 struct refspec *rs, int flags)
1452 {
1453 int send_all = flags & MATCH_REFS_ALL;
1454 int send_mirror = flags & MATCH_REFS_MIRROR;
1455 int send_prune = flags & MATCH_REFS_PRUNE;
1456 int errs;
1457 struct ref *ref, **dst_tail = tail_ref(dst);
1458 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1459
1460 /* If no refspec is provided, use the default ":" */
1461 if (!rs->nr)
1462 refspec_append(rs, ":");
1463
1464 errs = match_explicit_refs(src, *dst, &dst_tail, rs);
1465
1466 /* pick the remainder */
1467 for (ref = src; ref; ref = ref->next) {
1468 struct string_list_item *dst_item;
1469 struct ref *dst_peer;
1470 const struct refspec_item *pat = NULL;
1471 char *dst_name;
1472
1473 dst_name = get_ref_match(rs, ref, send_mirror, FROM_SRC, &pat);
1474 if (!dst_name)
1475 continue;
1476
1477 if (!dst_ref_index.nr)
1478 prepare_ref_index(&dst_ref_index, *dst);
1479
1480 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1481 dst_peer = dst_item ? dst_item->util : NULL;
1482 if (dst_peer) {
1483 if (dst_peer->peer_ref)
1484 /* We're already sending something to this ref. */
1485 goto free_name;
1486 } else {
1487 if (pat->matching && !(send_all || send_mirror))
1488 /*
1489 * Remote doesn't have it, and we have no
1490 * explicit pattern, and we don't have
1491 * --all or --mirror.
1492 */
1493 goto free_name;
1494
1495 /* Create a new one and link it */
1496 dst_peer = make_linked_ref(dst_name, &dst_tail);
1497 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1498 string_list_insert(&dst_ref_index,
1499 dst_peer->name)->util = dst_peer;
1500 }
1501 dst_peer->peer_ref = copy_ref(ref);
1502 dst_peer->force = pat->force;
1503 free_name:
1504 free(dst_name);
1505 }
1506
1507 string_list_clear(&dst_ref_index, 0);
1508
1509 if (flags & MATCH_REFS_FOLLOW_TAGS)
1510 add_missing_tags(src, dst, &dst_tail);
1511
1512 if (send_prune) {
1513 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1514 /* check for missing refs on the remote */
1515 for (ref = *dst; ref; ref = ref->next) {
1516 char *src_name;
1517
1518 if (ref->peer_ref)
1519 /* We're already sending something to this ref. */
1520 continue;
1521
1522 src_name = get_ref_match(rs, ref, send_mirror, FROM_DST, NULL);
1523 if (src_name) {
1524 if (!src_ref_index.nr)
1525 prepare_ref_index(&src_ref_index, src);
1526 if (!string_list_has_string(&src_ref_index,
1527 src_name))
1528 ref->peer_ref = alloc_delete_ref();
1529 free(src_name);
1530 }
1531 }
1532 string_list_clear(&src_ref_index, 0);
1533 }
1534
1535 *dst = apply_negative_refspecs(*dst, rs);
1536
1537 if (errs)
1538 return -1;
1539 return 0;
1540 }
1541
1542 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1543 int force_update)
1544 {
1545 struct ref *ref;
1546
1547 for (ref = remote_refs; ref; ref = ref->next) {
1548 int force_ref_update = ref->force || force_update;
1549 int reject_reason = 0;
1550
1551 if (ref->peer_ref)
1552 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1553 else if (!send_mirror)
1554 continue;
1555
1556 ref->deletion = is_null_oid(&ref->new_oid);
1557 if (!ref->deletion &&
1558 oideq(&ref->old_oid, &ref->new_oid)) {
1559 ref->status = REF_STATUS_UPTODATE;
1560 continue;
1561 }
1562
1563 /*
1564 * If the remote ref has moved and is now different
1565 * from what we expect, reject any push.
1566 *
1567 * It also is an error if the user told us to check
1568 * with the remote-tracking branch to find the value
1569 * to expect, but we did not have such a tracking
1570 * branch.
1571 */
1572 if (ref->expect_old_sha1) {
1573 if (!oideq(&ref->old_oid, &ref->old_oid_expect))
1574 reject_reason = REF_STATUS_REJECT_STALE;
1575 else
1576 /* If the ref isn't stale then force the update. */
1577 force_ref_update = 1;
1578 }
1579
1580 /*
1581 * If the update isn't already rejected then check
1582 * the usual "must fast-forward" rules.
1583 *
1584 * Decide whether an individual refspec A:B can be
1585 * pushed. The push will succeed if any of the
1586 * following are true:
1587 *
1588 * (1) the remote reference B does not exist
1589 *
1590 * (2) the remote reference B is being removed (i.e.,
1591 * pushing :B where no source is specified)
1592 *
1593 * (3) the destination is not under refs/tags/, and
1594 * if the old and new value is a commit, the new
1595 * is a descendant of the old.
1596 *
1597 * (4) it is forced using the +A:B notation, or by
1598 * passing the --force argument
1599 */
1600
1601 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1602 if (starts_with(ref->name, "refs/tags/"))
1603 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1604 else if (!has_object_file(&ref->old_oid))
1605 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1606 else if (!lookup_commit_reference_gently(the_repository, &ref->old_oid, 1) ||
1607 !lookup_commit_reference_gently(the_repository, &ref->new_oid, 1))
1608 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1609 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1610 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1611 }
1612
1613 /*
1614 * "--force" will defeat any rejection implemented
1615 * by the rules above.
1616 */
1617 if (!force_ref_update)
1618 ref->status = reject_reason;
1619 else if (reject_reason)
1620 ref->forced_update = 1;
1621 }
1622 }
1623
1624 static void set_merge(struct branch *ret)
1625 {
1626 struct remote *remote;
1627 char *ref;
1628 struct object_id oid;
1629 int i;
1630
1631 if (!ret)
1632 return; /* no branch */
1633 if (ret->merge)
1634 return; /* already run */
1635 if (!ret->remote_name || !ret->merge_nr) {
1636 /*
1637 * no merge config; let's make sure we don't confuse callers
1638 * with a non-zero merge_nr but a NULL merge
1639 */
1640 ret->merge_nr = 0;
1641 return;
1642 }
1643
1644 remote = remote_get(ret->remote_name);
1645
1646 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1647 for (i = 0; i < ret->merge_nr; i++) {
1648 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1649 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1650 if (!remote_find_tracking(remote, ret->merge[i]) ||
1651 strcmp(ret->remote_name, "."))
1652 continue;
1653 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1654 &oid, &ref, 0) == 1)
1655 ret->merge[i]->dst = ref;
1656 else
1657 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1658 }
1659 }
1660
1661 struct branch *branch_get(const char *name)
1662 {
1663 struct branch *ret;
1664
1665 read_config();
1666 if (!name || !*name || !strcmp(name, "HEAD"))
1667 ret = current_branch;
1668 else
1669 ret = make_branch(name, strlen(name));
1670 set_merge(ret);
1671 return ret;
1672 }
1673
1674 int branch_has_merge_config(struct branch *branch)
1675 {
1676 return branch && !!branch->merge;
1677 }
1678
1679 int branch_merge_matches(struct branch *branch,
1680 int i,
1681 const char *refname)
1682 {
1683 if (!branch || i < 0 || i >= branch->merge_nr)
1684 return 0;
1685 return refname_match(branch->merge[i]->src, refname);
1686 }
1687
1688 __attribute__((format (printf,2,3)))
1689 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1690 {
1691 if (err) {
1692 va_list ap;
1693 va_start(ap, fmt);
1694 strbuf_vaddf(err, fmt, ap);
1695 va_end(ap);
1696 }
1697 return NULL;
1698 }
1699
1700 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1701 {
1702 if (!branch)
1703 return error_buf(err, _("HEAD does not point to a branch"));
1704
1705 if (!branch->merge || !branch->merge[0]) {
1706 /*
1707 * no merge config; is it because the user didn't define any,
1708 * or because it is not a real branch, and get_branch
1709 * auto-vivified it?
1710 */
1711 if (!ref_exists(branch->refname))
1712 return error_buf(err, _("no such branch: '%s'"),
1713 branch->name);
1714 return error_buf(err,
1715 _("no upstream configured for branch '%s'"),
1716 branch->name);
1717 }
1718
1719 if (!branch->merge[0]->dst)
1720 return error_buf(err,
1721 _("upstream branch '%s' not stored as a remote-tracking branch"),
1722 branch->merge[0]->src);
1723
1724 return branch->merge[0]->dst;
1725 }
1726
1727 static const char *tracking_for_push_dest(struct remote *remote,
1728 const char *refname,
1729 struct strbuf *err)
1730 {
1731 char *ret;
1732
1733 ret = apply_refspecs(&remote->fetch, refname);
1734 if (!ret)
1735 return error_buf(err,
1736 _("push destination '%s' on remote '%s' has no local tracking branch"),
1737 refname, remote->name);
1738 return ret;
1739 }
1740
1741 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1742 {
1743 struct remote *remote;
1744
1745 remote = remote_get(pushremote_for_branch(branch, NULL));
1746 if (!remote)
1747 return error_buf(err,
1748 _("branch '%s' has no remote for pushing"),
1749 branch->name);
1750
1751 if (remote->push.nr) {
1752 char *dst;
1753 const char *ret;
1754
1755 dst = apply_refspecs(&remote->push, branch->refname);
1756 if (!dst)
1757 return error_buf(err,
1758 _("push refspecs for '%s' do not include '%s'"),
1759 remote->name, branch->name);
1760
1761 ret = tracking_for_push_dest(remote, dst, err);
1762 free(dst);
1763 return ret;
1764 }
1765
1766 if (remote->mirror)
1767 return tracking_for_push_dest(remote, branch->refname, err);
1768
1769 switch (push_default) {
1770 case PUSH_DEFAULT_NOTHING:
1771 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1772
1773 case PUSH_DEFAULT_MATCHING:
1774 case PUSH_DEFAULT_CURRENT:
1775 return tracking_for_push_dest(remote, branch->refname, err);
1776
1777 case PUSH_DEFAULT_UPSTREAM:
1778 return branch_get_upstream(branch, err);
1779
1780 case PUSH_DEFAULT_UNSPECIFIED:
1781 case PUSH_DEFAULT_SIMPLE:
1782 {
1783 const char *up, *cur;
1784
1785 up = branch_get_upstream(branch, err);
1786 if (!up)
1787 return NULL;
1788 cur = tracking_for_push_dest(remote, branch->refname, err);
1789 if (!cur)
1790 return NULL;
1791 if (strcmp(cur, up))
1792 return error_buf(err,
1793 _("cannot resolve 'simple' push to a single destination"));
1794 return cur;
1795 }
1796 }
1797
1798 BUG("unhandled push situation");
1799 }
1800
1801 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1802 {
1803 if (!branch)
1804 return error_buf(err, _("HEAD does not point to a branch"));
1805
1806 if (!branch->push_tracking_ref)
1807 branch->push_tracking_ref = branch_get_push_1(branch, err);
1808 return branch->push_tracking_ref;
1809 }
1810
1811 static int ignore_symref_update(const char *refname)
1812 {
1813 int flag;
1814
1815 if (!resolve_ref_unsafe(refname, 0, NULL, &flag))
1816 return 0; /* non-existing refs are OK */
1817 return (flag & REF_ISSYMREF);
1818 }
1819
1820 /*
1821 * Create and return a list of (struct ref) consisting of copies of
1822 * each remote_ref that matches refspec. refspec must be a pattern.
1823 * Fill in the copies' peer_ref to describe the local tracking refs to
1824 * which they map. Omit any references that would map to an existing
1825 * local symbolic ref.
1826 */
1827 static struct ref *get_expanded_map(const struct ref *remote_refs,
1828 const struct refspec_item *refspec)
1829 {
1830 const struct ref *ref;
1831 struct ref *ret = NULL;
1832 struct ref **tail = &ret;
1833
1834 for (ref = remote_refs; ref; ref = ref->next) {
1835 char *expn_name = NULL;
1836
1837 if (strchr(ref->name, '^'))
1838 continue; /* a dereference item */
1839 if (match_name_with_pattern(refspec->src, ref->name,
1840 refspec->dst, &expn_name) &&
1841 !ignore_symref_update(expn_name)) {
1842 struct ref *cpy = copy_ref(ref);
1843
1844 cpy->peer_ref = alloc_ref(expn_name);
1845 if (refspec->force)
1846 cpy->peer_ref->force = 1;
1847 *tail = cpy;
1848 tail = &cpy->next;
1849 }
1850 free(expn_name);
1851 }
1852
1853 return ret;
1854 }
1855
1856 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1857 {
1858 const struct ref *ref;
1859 const struct ref *best_match = NULL;
1860 int best_score = 0;
1861
1862 for (ref = refs; ref; ref = ref->next) {
1863 int score = refname_match(name, ref->name);
1864
1865 if (best_score < score) {
1866 best_match = ref;
1867 best_score = score;
1868 }
1869 }
1870 return best_match;
1871 }
1872
1873 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1874 {
1875 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1876
1877 if (!ref)
1878 return NULL;
1879
1880 return copy_ref(ref);
1881 }
1882
1883 static struct ref *get_local_ref(const char *name)
1884 {
1885 if (!name || name[0] == '\0')
1886 return NULL;
1887
1888 if (starts_with(name, "refs/"))
1889 return alloc_ref(name);
1890
1891 if (starts_with(name, "heads/") ||
1892 starts_with(name, "tags/") ||
1893 starts_with(name, "remotes/"))
1894 return alloc_ref_with_prefix("refs/", 5, name);
1895
1896 return alloc_ref_with_prefix("refs/heads/", 11, name);
1897 }
1898
1899 int get_fetch_map(const struct ref *remote_refs,
1900 const struct refspec_item *refspec,
1901 struct ref ***tail,
1902 int missing_ok)
1903 {
1904 struct ref *ref_map, **rmp;
1905
1906 if (refspec->negative)
1907 return 0;
1908
1909 if (refspec->pattern) {
1910 ref_map = get_expanded_map(remote_refs, refspec);
1911 } else {
1912 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1913
1914 if (refspec->exact_sha1) {
1915 ref_map = alloc_ref(name);
1916 get_oid_hex(name, &ref_map->old_oid);
1917 ref_map->exact_oid = 1;
1918 } else {
1919 ref_map = get_remote_ref(remote_refs, name);
1920 }
1921 if (!missing_ok && !ref_map)
1922 die(_("couldn't find remote ref %s"), name);
1923 if (ref_map) {
1924 ref_map->peer_ref = get_local_ref(refspec->dst);
1925 if (ref_map->peer_ref && refspec->force)
1926 ref_map->peer_ref->force = 1;
1927 }
1928 }
1929
1930 for (rmp = &ref_map; *rmp; ) {
1931 if ((*rmp)->peer_ref) {
1932 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1933 check_refname_format((*rmp)->peer_ref->name, 0)) {
1934 struct ref *ignore = *rmp;
1935 error(_("* Ignoring funny ref '%s' locally"),
1936 (*rmp)->peer_ref->name);
1937 *rmp = (*rmp)->next;
1938 free(ignore->peer_ref);
1939 free(ignore);
1940 continue;
1941 }
1942 }
1943 rmp = &((*rmp)->next);
1944 }
1945
1946 if (ref_map)
1947 tail_link_ref(ref_map, tail);
1948
1949 return 0;
1950 }
1951
1952 int resolve_remote_symref(struct ref *ref, struct ref *list)
1953 {
1954 if (!ref->symref)
1955 return 0;
1956 for (; list; list = list->next)
1957 if (!strcmp(ref->symref, list->name)) {
1958 oidcpy(&ref->old_oid, &list->old_oid);
1959 return 0;
1960 }
1961 return 1;
1962 }
1963
1964 /*
1965 * Compute the commit ahead/behind values for the pair branch_name, base.
1966 *
1967 * If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
1968 * counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
1969 * the (potentially expensive) a/b computation (*num_ours and *num_theirs are
1970 * set to zero).
1971 *
1972 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., ref
1973 * does not exist). Returns 0 if the commits are identical. Returns 1 if
1974 * commits are different.
1975 */
1976
1977 static int stat_branch_pair(const char *branch_name, const char *base,
1978 int *num_ours, int *num_theirs,
1979 enum ahead_behind_flags abf)
1980 {
1981 struct object_id oid;
1982 struct commit *ours, *theirs;
1983 struct rev_info revs;
1984 struct strvec argv = STRVEC_INIT;
1985
1986 /* Cannot stat if what we used to build on no longer exists */
1987 if (read_ref(base, &oid))
1988 return -1;
1989 theirs = lookup_commit_reference(the_repository, &oid);
1990 if (!theirs)
1991 return -1;
1992
1993 if (read_ref(branch_name, &oid))
1994 return -1;
1995 ours = lookup_commit_reference(the_repository, &oid);
1996 if (!ours)
1997 return -1;
1998
1999 *num_theirs = *num_ours = 0;
2000
2001 /* are we the same? */
2002 if (theirs == ours)
2003 return 0;
2004 if (abf == AHEAD_BEHIND_QUICK)
2005 return 1;
2006 if (abf != AHEAD_BEHIND_FULL)
2007 BUG("stat_branch_pair: invalid abf '%d'", abf);
2008
2009 /* Run "rev-list --left-right ours...theirs" internally... */
2010 strvec_push(&argv, ""); /* ignored */
2011 strvec_push(&argv, "--left-right");
2012 strvec_pushf(&argv, "%s...%s",
2013 oid_to_hex(&ours->object.oid),
2014 oid_to_hex(&theirs->object.oid));
2015 strvec_push(&argv, "--");
2016
2017 repo_init_revisions(the_repository, &revs, NULL);
2018 setup_revisions(argv.nr, argv.v, &revs, NULL);
2019 if (prepare_revision_walk(&revs))
2020 die(_("revision walk setup failed"));
2021
2022 /* ... and count the commits on each side. */
2023 while (1) {
2024 struct commit *c = get_revision(&revs);
2025 if (!c)
2026 break;
2027 if (c->object.flags & SYMMETRIC_LEFT)
2028 (*num_ours)++;
2029 else
2030 (*num_theirs)++;
2031 }
2032
2033 /* clear object flags smudged by the above traversal */
2034 clear_commit_marks(ours, ALL_REV_FLAGS);
2035 clear_commit_marks(theirs, ALL_REV_FLAGS);
2036
2037 strvec_clear(&argv);
2038 return 1;
2039 }
2040
2041 /*
2042 * Lookup the tracking branch for the given branch and if present, optionally
2043 * compute the commit ahead/behind values for the pair.
2044 *
2045 * If for_push is true, the tracking branch refers to the push branch,
2046 * otherwise it refers to the upstream branch.
2047 *
2048 * The name of the tracking branch (or NULL if it is not defined) is
2049 * returned via *tracking_name, if it is not itself NULL.
2050 *
2051 * If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
2052 * counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
2053 * the (potentially expensive) a/b computation (*num_ours and *num_theirs are
2054 * set to zero).
2055 *
2056 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
2057 * upstream defined, or ref does not exist). Returns 0 if the commits are
2058 * identical. Returns 1 if commits are different.
2059 */
2060 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
2061 const char **tracking_name, int for_push,
2062 enum ahead_behind_flags abf)
2063 {
2064 const char *base;
2065
2066 /* Cannot stat unless we are marked to build on top of somebody else. */
2067 base = for_push ? branch_get_push(branch, NULL) :
2068 branch_get_upstream(branch, NULL);
2069 if (tracking_name)
2070 *tracking_name = base;
2071 if (!base)
2072 return -1;
2073
2074 return stat_branch_pair(branch->refname, base, num_ours, num_theirs, abf);
2075 }
2076
2077 /*
2078 * Return true when there is anything to report, otherwise false.
2079 */
2080 int format_tracking_info(struct branch *branch, struct strbuf *sb,
2081 enum ahead_behind_flags abf)
2082 {
2083 int ours, theirs, sti;
2084 const char *full_base;
2085 char *base;
2086 int upstream_is_gone = 0;
2087
2088 sti = stat_tracking_info(branch, &ours, &theirs, &full_base, 0, abf);
2089 if (sti < 0) {
2090 if (!full_base)
2091 return 0;
2092 upstream_is_gone = 1;
2093 }
2094
2095 base = shorten_unambiguous_ref(full_base, 0);
2096 if (upstream_is_gone) {
2097 strbuf_addf(sb,
2098 _("Your branch is based on '%s', but the upstream is gone.\n"),
2099 base);
2100 if (advice_status_hints)
2101 strbuf_addstr(sb,
2102 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2103 } else if (!sti) {
2104 strbuf_addf(sb,
2105 _("Your branch is up to date with '%s'.\n"),
2106 base);
2107 } else if (abf == AHEAD_BEHIND_QUICK) {
2108 strbuf_addf(sb,
2109 _("Your branch and '%s' refer to different commits.\n"),
2110 base);
2111 if (advice_status_hints)
2112 strbuf_addf(sb, _(" (use \"%s\" for details)\n"),
2113 "git status --ahead-behind");
2114 } else if (!theirs) {
2115 strbuf_addf(sb,
2116 Q_("Your branch is ahead of '%s' by %d commit.\n",
2117 "Your branch is ahead of '%s' by %d commits.\n",
2118 ours),
2119 base, ours);
2120 if (advice_status_hints)
2121 strbuf_addstr(sb,
2122 _(" (use \"git push\" to publish your local commits)\n"));
2123 } else if (!ours) {
2124 strbuf_addf(sb,
2125 Q_("Your branch is behind '%s' by %d commit, "
2126 "and can be fast-forwarded.\n",
2127 "Your branch is behind '%s' by %d commits, "
2128 "and can be fast-forwarded.\n",
2129 theirs),
2130 base, theirs);
2131 if (advice_status_hints)
2132 strbuf_addstr(sb,
2133 _(" (use \"git pull\" to update your local branch)\n"));
2134 } else {
2135 strbuf_addf(sb,
2136 Q_("Your branch and '%s' have diverged,\n"
2137 "and have %d and %d different commit each, "
2138 "respectively.\n",
2139 "Your branch and '%s' have diverged,\n"
2140 "and have %d and %d different commits each, "
2141 "respectively.\n",
2142 ours + theirs),
2143 base, ours, theirs);
2144 if (advice_status_hints)
2145 strbuf_addstr(sb,
2146 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2147 }
2148 free(base);
2149 return 1;
2150 }
2151
2152 static int one_local_ref(const char *refname, const struct object_id *oid,
2153 int flag, void *cb_data)
2154 {
2155 struct ref ***local_tail = cb_data;
2156 struct ref *ref;
2157
2158 /* we already know it starts with refs/ to get here */
2159 if (check_refname_format(refname + 5, 0))
2160 return 0;
2161
2162 ref = alloc_ref(refname);
2163 oidcpy(&ref->new_oid, oid);
2164 **local_tail = ref;
2165 *local_tail = &ref->next;
2166 return 0;
2167 }
2168
2169 struct ref *get_local_heads(void)
2170 {
2171 struct ref *local_refs = NULL, **local_tail = &local_refs;
2172
2173 for_each_ref(one_local_ref, &local_tail);
2174 return local_refs;
2175 }
2176
2177 struct ref *guess_remote_head(const struct ref *head,
2178 const struct ref *refs,
2179 int all)
2180 {
2181 const struct ref *r;
2182 struct ref *list = NULL;
2183 struct ref **tail = &list;
2184
2185 if (!head)
2186 return NULL;
2187
2188 /*
2189 * Some transports support directly peeking at
2190 * where HEAD points; if that is the case, then
2191 * we don't have to guess.
2192 */
2193 if (head->symref)
2194 return copy_ref(find_ref_by_name(refs, head->symref));
2195
2196 /* If a remote branch exists with the default branch name, let's use it. */
2197 if (!all) {
2198 char *ref = xstrfmt("refs/heads/%s", git_default_branch_name());
2199
2200 r = find_ref_by_name(refs, ref);
2201 free(ref);
2202 if (r && oideq(&r->old_oid, &head->old_oid))
2203 return copy_ref(r);
2204
2205 /* Fall back to the hard-coded historical default */
2206 r = find_ref_by_name(refs, "refs/heads/master");
2207 if (r && oideq(&r->old_oid, &head->old_oid))
2208 return copy_ref(r);
2209 }
2210
2211 /* Look for another ref that points there */
2212 for (r = refs; r; r = r->next) {
2213 if (r != head &&
2214 starts_with(r->name, "refs/heads/") &&
2215 oideq(&r->old_oid, &head->old_oid)) {
2216 *tail = copy_ref(r);
2217 tail = &((*tail)->next);
2218 if (!all)
2219 break;
2220 }
2221 }
2222
2223 return list;
2224 }
2225
2226 struct stale_heads_info {
2227 struct string_list *ref_names;
2228 struct ref **stale_refs_tail;
2229 struct refspec *rs;
2230 };
2231
2232 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2233 int flags, void *cb_data)
2234 {
2235 struct stale_heads_info *info = cb_data;
2236 struct string_list matches = STRING_LIST_INIT_DUP;
2237 struct refspec_item query;
2238 int i, stale = 1;
2239 memset(&query, 0, sizeof(struct refspec_item));
2240 query.dst = (char *)refname;
2241
2242 query_refspecs_multiple(info->rs, &query, &matches);
2243 if (matches.nr == 0)
2244 goto clean_exit; /* No matches */
2245
2246 /*
2247 * If we did find a suitable refspec and it's not a symref and
2248 * it's not in the list of refs that currently exist in that
2249 * remote, we consider it to be stale. In order to deal with
2250 * overlapping refspecs, we need to go over all of the
2251 * matching refs.
2252 */
2253 if (flags & REF_ISSYMREF)
2254 goto clean_exit;
2255
2256 for (i = 0; stale && i < matches.nr; i++)
2257 if (string_list_has_string(info->ref_names, matches.items[i].string))
2258 stale = 0;
2259
2260 if (stale) {
2261 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2262 oidcpy(&ref->new_oid, oid);
2263 }
2264
2265 clean_exit:
2266 string_list_clear(&matches, 0);
2267 return 0;
2268 }
2269
2270 struct ref *get_stale_heads(struct refspec *rs, struct ref *fetch_map)
2271 {
2272 struct ref *ref, *stale_refs = NULL;
2273 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2274 struct stale_heads_info info;
2275
2276 info.ref_names = &ref_names;
2277 info.stale_refs_tail = &stale_refs;
2278 info.rs = rs;
2279 for (ref = fetch_map; ref; ref = ref->next)
2280 string_list_append(&ref_names, ref->name);
2281 string_list_sort(&ref_names);
2282 for_each_ref(get_stale_heads_cb, &info);
2283 string_list_clear(&ref_names, 0);
2284 return stale_refs;
2285 }
2286
2287 /*
2288 * Compare-and-swap
2289 */
2290 static void clear_cas_option(struct push_cas_option *cas)
2291 {
2292 int i;
2293
2294 for (i = 0; i < cas->nr; i++)
2295 free(cas->entry[i].refname);
2296 free(cas->entry);
2297 memset(cas, 0, sizeof(*cas));
2298 }
2299
2300 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2301 const char *refname,
2302 size_t refnamelen)
2303 {
2304 struct push_cas *entry;
2305 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2306 entry = &cas->entry[cas->nr++];
2307 memset(entry, 0, sizeof(*entry));
2308 entry->refname = xmemdupz(refname, refnamelen);
2309 return entry;
2310 }
2311
2312 static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2313 {
2314 const char *colon;
2315 struct push_cas *entry;
2316
2317 if (unset) {
2318 /* "--no-<option>" */
2319 clear_cas_option(cas);
2320 return 0;
2321 }
2322
2323 if (!arg) {
2324 /* just "--<option>" */
2325 cas->use_tracking_for_rest = 1;
2326 return 0;
2327 }
2328
2329 /* "--<option>=refname" or "--<option>=refname:value" */
2330 colon = strchrnul(arg, ':');
2331 entry = add_cas_entry(cas, arg, colon - arg);
2332 if (!*colon)
2333 entry->use_tracking = 1;
2334 else if (!colon[1])
2335 oidclr(&entry->expect);
2336 else if (get_oid(colon + 1, &entry->expect))
2337 return error(_("cannot parse expected object name '%s'"),
2338 colon + 1);
2339 return 0;
2340 }
2341
2342 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2343 {
2344 return parse_push_cas_option(opt->value, arg, unset);
2345 }
2346
2347 int is_empty_cas(const struct push_cas_option *cas)
2348 {
2349 return !cas->use_tracking_for_rest && !cas->nr;
2350 }
2351
2352 /*
2353 * Look at remote.fetch refspec and see if we have a remote
2354 * tracking branch for the refname there. Fill its current
2355 * value in sha1[].
2356 * If we cannot do so, return negative to signal an error.
2357 */
2358 static int remote_tracking(struct remote *remote, const char *refname,
2359 struct object_id *oid)
2360 {
2361 char *dst;
2362
2363 dst = apply_refspecs(&remote->fetch, refname);
2364 if (!dst)
2365 return -1; /* no tracking ref for refname at remote */
2366 if (read_ref(dst, oid))
2367 return -1; /* we know what the tracking ref is but we cannot read it */
2368 return 0;
2369 }
2370
2371 static void apply_cas(struct push_cas_option *cas,
2372 struct remote *remote,
2373 struct ref *ref)
2374 {
2375 int i;
2376
2377 /* Find an explicit --<option>=<name>[:<value>] entry */
2378 for (i = 0; i < cas->nr; i++) {
2379 struct push_cas *entry = &cas->entry[i];
2380 if (!refname_match(entry->refname, ref->name))
2381 continue;
2382 ref->expect_old_sha1 = 1;
2383 if (!entry->use_tracking)
2384 oidcpy(&ref->old_oid_expect, &entry->expect);
2385 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2386 oidclr(&ref->old_oid_expect);
2387 return;
2388 }
2389
2390 /* Are we using "--<option>" to cover all? */
2391 if (!cas->use_tracking_for_rest)
2392 return;
2393
2394 ref->expect_old_sha1 = 1;
2395 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2396 oidclr(&ref->old_oid_expect);
2397 }
2398
2399 void apply_push_cas(struct push_cas_option *cas,
2400 struct remote *remote,
2401 struct ref *remote_refs)
2402 {
2403 struct ref *ref;
2404 for (ref = remote_refs; ref; ref = ref->next)
2405 apply_cas(cas, remote, ref);
2406 }
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