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t5607: make hash size independent
[git.git] / remote.c
blob5c4666b53abc0c84fa863c172387fa6c2cc159d5
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_REPO)
373 remote->configured_in_repo = 1;
374 if (!strcmp(subkey, "mirror"))
375 remote->mirror = git_config_bool(key, value);
376 else if (!strcmp(subkey, "skipdefaultupdate"))
377 remote->skip_default_update = git_config_bool(key, value);
378 else if (!strcmp(subkey, "skipfetchall"))
379 remote->skip_default_update = git_config_bool(key, value);
380 else if (!strcmp(subkey, "prune"))
381 remote->prune = git_config_bool(key, value);
382 else if (!strcmp(subkey, "prunetags"))
383 remote->prune_tags = git_config_bool(key, value);
384 else if (!strcmp(subkey, "url")) {
385 const char *v;
386 if (git_config_string(&v, key, value))
387 return -1;
388 add_url(remote, v);
389 } else if (!strcmp(subkey, "pushurl")) {
390 const char *v;
391 if (git_config_string(&v, key, value))
392 return -1;
393 add_pushurl(remote, v);
394 } else if (!strcmp(subkey, "push")) {
395 const char *v;
396 if (git_config_string(&v, key, value))
397 return -1;
398 refspec_append(&remote->push, v);
399 free((char *)v);
400 } else if (!strcmp(subkey, "fetch")) {
401 const char *v;
402 if (git_config_string(&v, key, value))
403 return -1;
404 refspec_append(&remote->fetch, v);
405 free((char *)v);
406 } else if (!strcmp(subkey, "receivepack")) {
407 const char *v;
408 if (git_config_string(&v, key, value))
409 return -1;
410 if (!remote->receivepack)
411 remote->receivepack = v;
412 else
413 error(_("more than one receivepack given, using the first"));
414 } else if (!strcmp(subkey, "uploadpack")) {
415 const char *v;
416 if (git_config_string(&v, key, value))
417 return -1;
418 if (!remote->uploadpack)
419 remote->uploadpack = v;
420 else
421 error(_("more than one uploadpack given, using the first"));
422 } else if (!strcmp(subkey, "tagopt")) {
423 if (!strcmp(value, "--no-tags"))
424 remote->fetch_tags = -1;
425 else if (!strcmp(value, "--tags"))
426 remote->fetch_tags = 2;
427 } else if (!strcmp(subkey, "proxy")) {
428 return git_config_string((const char **)&remote->http_proxy,
429 key, value);
430 } else if (!strcmp(subkey, "proxyauthmethod")) {
431 return git_config_string((const char **)&remote->http_proxy_authmethod,
432 key, value);
433 } else if (!strcmp(subkey, "vcs")) {
434 return git_config_string(&remote->foreign_vcs, key, value);
435 }
436 return 0;
437 }
438
439 static void alias_all_urls(void)
440 {
441 int i, j;
442 for (i = 0; i < remotes_nr; i++) {
443 int add_pushurl_aliases;
444 if (!remotes[i])
445 continue;
446 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
447 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
448 }
449 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
450 for (j = 0; j < remotes[i]->url_nr; j++) {
451 if (add_pushurl_aliases)
452 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
453 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
454 }
455 }
456 }
457
458 static void read_config(void)
459 {
460 static int loaded;
461 int flag;
462
463 if (loaded)
464 return;
465 loaded = 1;
466
467 current_branch = NULL;
468 if (startup_info->have_repository) {
469 const char *head_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flag);
470 if (head_ref && (flag & REF_ISSYMREF) &&
471 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
472 current_branch = make_branch(head_ref, 0);
473 }
474 }
475 git_config(handle_config, NULL);
476 alias_all_urls();
477 }
478
479 static int valid_remote_nick(const char *name)
480 {
481 if (!name[0] || is_dot_or_dotdot(name))
482 return 0;
483
484 /* remote nicknames cannot contain slashes */
485 while (*name)
486 if (is_dir_sep(*name++))
487 return 0;
488 return 1;
489 }
490
491 const char *remote_for_branch(struct branch *branch, int *explicit)
492 {
493 if (branch && branch->remote_name) {
494 if (explicit)
495 *explicit = 1;
496 return branch->remote_name;
497 }
498 if (explicit)
499 *explicit = 0;
500 return "origin";
501 }
502
503 const char *pushremote_for_branch(struct branch *branch, int *explicit)
504 {
505 if (branch && branch->pushremote_name) {
506 if (explicit)
507 *explicit = 1;
508 return branch->pushremote_name;
509 }
510 if (pushremote_name) {
511 if (explicit)
512 *explicit = 1;
513 return pushremote_name;
514 }
515 return remote_for_branch(branch, explicit);
516 }
517
518 const char *remote_ref_for_branch(struct branch *branch, int for_push,
519 int *explicit)
520 {
521 if (branch) {
522 if (!for_push) {
523 if (branch->merge_nr) {
524 if (explicit)
525 *explicit = 1;
526 return branch->merge_name[0];
527 }
528 } else {
529 const char *dst, *remote_name =
530 pushremote_for_branch(branch, NULL);
531 struct remote *remote = remote_get(remote_name);
532
533 if (remote && remote->push.nr &&
534 (dst = apply_refspecs(&remote->push,
535 branch->refname))) {
536 if (explicit)
537 *explicit = 1;
538 return dst;
539 }
540 }
541 }
542 if (explicit)
543 *explicit = 0;
544 return "";
545 }
546
547 static struct remote *remote_get_1(const char *name,
548 const char *(*get_default)(struct branch *, int *))
549 {
550 struct remote *ret;
551 int name_given = 0;
552
553 read_config();
554
555 if (name)
556 name_given = 1;
557 else
558 name = get_default(current_branch, &name_given);
559
560 ret = make_remote(name, 0);
561 if (valid_remote_nick(name) && have_git_dir()) {
562 if (!valid_remote(ret))
563 read_remotes_file(ret);
564 if (!valid_remote(ret))
565 read_branches_file(ret);
566 }
567 if (name_given && !valid_remote(ret))
568 add_url_alias(ret, name);
569 if (!valid_remote(ret))
570 return NULL;
571 return ret;
572 }
573
574 struct remote *remote_get(const char *name)
575 {
576 return remote_get_1(name, remote_for_branch);
577 }
578
579 struct remote *pushremote_get(const char *name)
580 {
581 return remote_get_1(name, pushremote_for_branch);
582 }
583
584 int remote_is_configured(struct remote *remote, int in_repo)
585 {
586 if (!remote)
587 return 0;
588 if (in_repo)
589 return remote->configured_in_repo;
590 return !!remote->origin;
591 }
592
593 int for_each_remote(each_remote_fn fn, void *priv)
594 {
595 int i, result = 0;
596 read_config();
597 for (i = 0; i < remotes_nr && !result; i++) {
598 struct remote *r = remotes[i];
599 if (!r)
600 continue;
601 result = fn(r, priv);
602 }
603 return result;
604 }
605
606 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
607 {
608 if (strcmp(ref1->name, ref2->name)) {
609 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
610 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
611 die(_("Cannot fetch both %s and %s to %s"),
612 ref1->name, ref2->name, ref2->peer_ref->name);
613 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
614 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
615 warning(_("%s usually tracks %s, not %s"),
616 ref2->peer_ref->name, ref2->name, ref1->name);
617 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
618 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
619 die(_("%s tracks both %s and %s"),
620 ref2->peer_ref->name, ref1->name, ref2->name);
621 } else {
622 /*
623 * This last possibility doesn't occur because
624 * FETCH_HEAD_IGNORE entries always appear at
625 * the end of the list.
626 */
627 BUG("Internal error");
628 }
629 }
630 free(ref2->peer_ref);
631 free(ref2);
632 }
633
634 struct ref *ref_remove_duplicates(struct ref *ref_map)
635 {
636 struct string_list refs = STRING_LIST_INIT_NODUP;
637 struct ref *retval = NULL;
638 struct ref **p = &retval;
639
640 while (ref_map) {
641 struct ref *ref = ref_map;
642
643 ref_map = ref_map->next;
644 ref->next = NULL;
645
646 if (!ref->peer_ref) {
647 *p = ref;
648 p = &ref->next;
649 } else {
650 struct string_list_item *item =
651 string_list_insert(&refs, ref->peer_ref->name);
652
653 if (item->util) {
654 /* Entry already existed */
655 handle_duplicate((struct ref *)item->util, ref);
656 } else {
657 *p = ref;
658 p = &ref->next;
659 item->util = ref;
660 }
661 }
662 }
663
664 string_list_clear(&refs, 0);
665 return retval;
666 }
667
668 int remote_has_url(struct remote *remote, const char *url)
669 {
670 int i;
671 for (i = 0; i < remote->url_nr; i++) {
672 if (!strcmp(remote->url[i], url))
673 return 1;
674 }
675 return 0;
676 }
677
678 static int match_name_with_pattern(const char *key, const char *name,
679 const char *value, char **result)
680 {
681 const char *kstar = strchr(key, '*');
682 size_t klen;
683 size_t ksuffixlen;
684 size_t namelen;
685 int ret;
686 if (!kstar)
687 die(_("key '%s' of pattern had no '*'"), key);
688 klen = kstar - key;
689 ksuffixlen = strlen(kstar + 1);
690 namelen = strlen(name);
691 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
692 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
693 if (ret && value) {
694 struct strbuf sb = STRBUF_INIT;
695 const char *vstar = strchr(value, '*');
696 if (!vstar)
697 die(_("value '%s' of pattern has no '*'"), value);
698 strbuf_add(&sb, value, vstar - value);
699 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
700 strbuf_addstr(&sb, vstar + 1);
701 *result = strbuf_detach(&sb, NULL);
702 }
703 return ret;
704 }
705
706 static void query_refspecs_multiple(struct refspec *rs,
707 struct refspec_item *query,
708 struct string_list *results)
709 {
710 int i;
711 int find_src = !query->src;
712
713 if (find_src && !query->dst)
714 BUG("query_refspecs_multiple: need either src or dst");
715
716 for (i = 0; i < rs->nr; i++) {
717 struct refspec_item *refspec = &rs->items[i];
718 const char *key = find_src ? refspec->dst : refspec->src;
719 const char *value = find_src ? refspec->src : refspec->dst;
720 const char *needle = find_src ? query->dst : query->src;
721 char **result = find_src ? &query->src : &query->dst;
722
723 if (!refspec->dst)
724 continue;
725 if (refspec->pattern) {
726 if (match_name_with_pattern(key, needle, value, result))
727 string_list_append_nodup(results, *result);
728 } else if (!strcmp(needle, key)) {
729 string_list_append(results, value);
730 }
731 }
732 }
733
734 int query_refspecs(struct refspec *rs, struct refspec_item *query)
735 {
736 int i;
737 int find_src = !query->src;
738 const char *needle = find_src ? query->dst : query->src;
739 char **result = find_src ? &query->src : &query->dst;
740
741 if (find_src && !query->dst)
742 BUG("query_refspecs: need either src or dst");
743
744 for (i = 0; i < rs->nr; i++) {
745 struct refspec_item *refspec = &rs->items[i];
746 const char *key = find_src ? refspec->dst : refspec->src;
747 const char *value = find_src ? refspec->src : refspec->dst;
748
749 if (!refspec->dst)
750 continue;
751 if (refspec->pattern) {
752 if (match_name_with_pattern(key, needle, value, result)) {
753 query->force = refspec->force;
754 return 0;
755 }
756 } else if (!strcmp(needle, key)) {
757 *result = xstrdup(value);
758 query->force = refspec->force;
759 return 0;
760 }
761 }
762 return -1;
763 }
764
765 char *apply_refspecs(struct refspec *rs, const char *name)
766 {
767 struct refspec_item query;
768
769 memset(&query, 0, sizeof(struct refspec_item));
770 query.src = (char *)name;
771
772 if (query_refspecs(rs, &query))
773 return NULL;
774
775 return query.dst;
776 }
777
778 int remote_find_tracking(struct remote *remote, struct refspec_item *refspec)
779 {
780 return query_refspecs(&remote->fetch, refspec);
781 }
782
783 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
784 const char *name)
785 {
786 size_t len = strlen(name);
787 struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
788 memcpy(ref->name, prefix, prefixlen);
789 memcpy(ref->name + prefixlen, name, len);
790 return ref;
791 }
792
793 struct ref *alloc_ref(const char *name)
794 {
795 return alloc_ref_with_prefix("", 0, name);
796 }
797
798 struct ref *copy_ref(const struct ref *ref)
799 {
800 struct ref *cpy;
801 size_t len;
802 if (!ref)
803 return NULL;
804 len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
805 cpy = xmalloc(len);
806 memcpy(cpy, ref, len);
807 cpy->next = NULL;
808 cpy->symref = xstrdup_or_null(ref->symref);
809 cpy->remote_status = xstrdup_or_null(ref->remote_status);
810 cpy->peer_ref = copy_ref(ref->peer_ref);
811 return cpy;
812 }
813
814 struct ref *copy_ref_list(const struct ref *ref)
815 {
816 struct ref *ret = NULL;
817 struct ref **tail = &ret;
818 while (ref) {
819 *tail = copy_ref(ref);
820 ref = ref->next;
821 tail = &((*tail)->next);
822 }
823 return ret;
824 }
825
826 void free_one_ref(struct ref *ref)
827 {
828 if (!ref)
829 return;
830 free_one_ref(ref->peer_ref);
831 free(ref->remote_status);
832 free(ref->symref);
833 free(ref);
834 }
835
836 void free_refs(struct ref *ref)
837 {
838 struct ref *next;
839 while (ref) {
840 next = ref->next;
841 free_one_ref(ref);
842 ref = next;
843 }
844 }
845
846 int ref_compare_name(const void *va, const void *vb)
847 {
848 const struct ref *a = va, *b = vb;
849 return strcmp(a->name, b->name);
850 }
851
852 static void *ref_list_get_next(const void *a)
853 {
854 return ((const struct ref *)a)->next;
855 }
856
857 static void ref_list_set_next(void *a, void *next)
858 {
859 ((struct ref *)a)->next = next;
860 }
861
862 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
863 {
864 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
865 }
866
867 int count_refspec_match(const char *pattern,
868 struct ref *refs,
869 struct ref **matched_ref)
870 {
871 int patlen = strlen(pattern);
872 struct ref *matched_weak = NULL;
873 struct ref *matched = NULL;
874 int weak_match = 0;
875 int match = 0;
876
877 for (weak_match = match = 0; refs; refs = refs->next) {
878 char *name = refs->name;
879 int namelen = strlen(name);
880
881 if (!refname_match(pattern, name))
882 continue;
883
884 /* A match is "weak" if it is with refs outside
885 * heads or tags, and did not specify the pattern
886 * in full (e.g. "refs/remotes/origin/master") or at
887 * least from the toplevel (e.g. "remotes/origin/master");
888 * otherwise "git push $URL master" would result in
889 * ambiguity between remotes/origin/master and heads/master
890 * at the remote site.
891 */
892 if (namelen != patlen &&
893 patlen != namelen - 5 &&
894 !starts_with(name, "refs/heads/") &&
895 !starts_with(name, "refs/tags/")) {
896 /* We want to catch the case where only weak
897 * matches are found and there are multiple
898 * matches, and where more than one strong
899 * matches are found, as ambiguous. One
900 * strong match with zero or more weak matches
901 * are acceptable as a unique match.
902 */
903 matched_weak = refs;
904 weak_match++;
905 }
906 else {
907 matched = refs;
908 match++;
909 }
910 }
911 if (!matched) {
912 if (matched_ref)
913 *matched_ref = matched_weak;
914 return weak_match;
915 }
916 else {
917 if (matched_ref)
918 *matched_ref = matched;
919 return match;
920 }
921 }
922
923 static void tail_link_ref(struct ref *ref, struct ref ***tail)
924 {
925 **tail = ref;
926 while (ref->next)
927 ref = ref->next;
928 *tail = &ref->next;
929 }
930
931 static struct ref *alloc_delete_ref(void)
932 {
933 struct ref *ref = alloc_ref("(delete)");
934 oidclr(&ref->new_oid);
935 return ref;
936 }
937
938 static int try_explicit_object_name(const char *name,
939 struct ref **match)
940 {
941 struct object_id oid;
942
943 if (!*name) {
944 if (match)
945 *match = alloc_delete_ref();
946 return 0;
947 }
948
949 if (get_oid(name, &oid))
950 return -1;
951
952 if (match) {
953 *match = alloc_ref(name);
954 oidcpy(&(*match)->new_oid, &oid);
955 }
956 return 0;
957 }
958
959 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
960 {
961 struct ref *ret = alloc_ref(name);
962 tail_link_ref(ret, tail);
963 return ret;
964 }
965
966 static char *guess_ref(const char *name, struct ref *peer)
967 {
968 struct strbuf buf = STRBUF_INIT;
969
970 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
971 NULL, NULL);
972 if (!r)
973 return NULL;
974
975 if (starts_with(r, "refs/heads/")) {
976 strbuf_addstr(&buf, "refs/heads/");
977 } else if (starts_with(r, "refs/tags/")) {
978 strbuf_addstr(&buf, "refs/tags/");
979 } else {
980 return NULL;
981 }
982
983 strbuf_addstr(&buf, name);
984 return strbuf_detach(&buf, NULL);
985 }
986
987 static int match_explicit_lhs(struct ref *src,
988 struct refspec_item *rs,
989 struct ref **match,
990 int *allocated_match)
991 {
992 switch (count_refspec_match(rs->src, src, match)) {
993 case 1:
994 if (allocated_match)
995 *allocated_match = 0;
996 return 0;
997 case 0:
998 /* The source could be in the get_sha1() format
999 * not a reference name. :refs/other is a
1000 * way to delete 'other' ref at the remote end.
1001 */
1002 if (try_explicit_object_name(rs->src, match) < 0)
1003 return error(_("src refspec %s does not match any"), rs->src);
1004 if (allocated_match)
1005 *allocated_match = 1;
1006 return 0;
1007 default:
1008 return error(_("src refspec %s matches more than one"), rs->src);
1009 }
1010 }
1011
1012 static void show_push_unqualified_ref_name_error(const char *dst_value,
1013 const char *matched_src_name)
1014 {
1015 struct object_id oid;
1016 enum object_type type;
1017
1018 /*
1019 * TRANSLATORS: "matches '%s'%" is the <dst> part of "git push
1020 * <remote> <src>:<dst>" push, and "being pushed ('%s')" is
1021 * the <src>.
1022 */
1023 error(_("The destination you provided is not a full refname (i.e.,\n"
1024 "starting with \"refs/\"). We tried to guess what you meant by:\n"
1025 "\n"
1026 "- Looking for a ref that matches '%s' on the remote side.\n"
1027 "- Checking if the <src> being pushed ('%s')\n"
1028 " is a ref in \"refs/{heads,tags}/\". If so we add a corresponding\n"
1029 " refs/{heads,tags}/ prefix on the remote side.\n"
1030 "\n"
1031 "Neither worked, so we gave up. You must fully qualify the ref."),
1032 dst_value, matched_src_name);
1033
1034 if (!advice_push_unqualified_ref_name)
1035 return;
1036
1037 if (get_oid(matched_src_name, &oid))
1038 BUG("'%s' is not a valid object, "
1039 "match_explicit_lhs() should catch this!",
1040 matched_src_name);
1041 type = oid_object_info(the_repository, &oid, NULL);
1042 if (type == OBJ_COMMIT) {
1043 advise(_("The <src> part of the refspec is a commit object.\n"
1044 "Did you mean to create a new branch by pushing to\n"
1045 "'%s:refs/heads/%s'?"),
1046 matched_src_name, dst_value);
1047 } else if (type == OBJ_TAG) {
1048 advise(_("The <src> part of the refspec is a tag object.\n"
1049 "Did you mean to create a new tag by pushing to\n"
1050 "'%s:refs/tags/%s'?"),
1051 matched_src_name, dst_value);
1052 } else if (type == OBJ_TREE) {
1053 advise(_("The <src> part of the refspec is a tree object.\n"
1054 "Did you mean to tag a new tree by pushing to\n"
1055 "'%s:refs/tags/%s'?"),
1056 matched_src_name, dst_value);
1057 } else if (type == OBJ_BLOB) {
1058 advise(_("The <src> part of the refspec is a blob object.\n"
1059 "Did you mean to tag a new blob by pushing to\n"
1060 "'%s:refs/tags/%s'?"),
1061 matched_src_name, dst_value);
1062 } else {
1063 BUG("'%s' should be commit/tag/tree/blob, is '%d'",
1064 matched_src_name, type);
1065 }
1066 }
1067
1068 static int match_explicit(struct ref *src, struct ref *dst,
1069 struct ref ***dst_tail,
1070 struct refspec_item *rs)
1071 {
1072 struct ref *matched_src, *matched_dst;
1073 int allocated_src;
1074
1075 const char *dst_value = rs->dst;
1076 char *dst_guess;
1077
1078 if (rs->pattern || rs->matching)
1079 return 0;
1080
1081 matched_src = matched_dst = NULL;
1082 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1083 return -1;
1084
1085 if (!dst_value) {
1086 int flag;
1087
1088 dst_value = resolve_ref_unsafe(matched_src->name,
1089 RESOLVE_REF_READING,
1090 NULL, &flag);
1091 if (!dst_value ||
1092 ((flag & REF_ISSYMREF) &&
1093 !starts_with(dst_value, "refs/heads/")))
1094 die(_("%s cannot be resolved to branch"),
1095 matched_src->name);
1096 }
1097
1098 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1099 case 1:
1100 break;
1101 case 0:
1102 if (starts_with(dst_value, "refs/")) {
1103 matched_dst = make_linked_ref(dst_value, dst_tail);
1104 } else if (is_null_oid(&matched_src->new_oid)) {
1105 error(_("unable to delete '%s': remote ref does not exist"),
1106 dst_value);
1107 } else if ((dst_guess = guess_ref(dst_value, matched_src))) {
1108 matched_dst = make_linked_ref(dst_guess, dst_tail);
1109 free(dst_guess);
1110 } else {
1111 show_push_unqualified_ref_name_error(dst_value,
1112 matched_src->name);
1113 }
1114 break;
1115 default:
1116 matched_dst = NULL;
1117 error(_("dst refspec %s matches more than one"),
1118 dst_value);
1119 break;
1120 }
1121 if (!matched_dst)
1122 return -1;
1123 if (matched_dst->peer_ref)
1124 return error(_("dst ref %s receives from more than one src"),
1125 matched_dst->name);
1126 else {
1127 matched_dst->peer_ref = allocated_src ?
1128 matched_src :
1129 copy_ref(matched_src);
1130 matched_dst->force = rs->force;
1131 }
1132 return 0;
1133 }
1134
1135 static int match_explicit_refs(struct ref *src, struct ref *dst,
1136 struct ref ***dst_tail, struct refspec *rs)
1137 {
1138 int i, errs;
1139 for (i = errs = 0; i < rs->nr; i++)
1140 errs += match_explicit(src, dst, dst_tail, &rs->items[i]);
1141 return errs;
1142 }
1143
1144 static char *get_ref_match(const struct refspec *rs, const struct ref *ref,
1145 int send_mirror, int direction,
1146 const struct refspec_item **ret_pat)
1147 {
1148 const struct refspec_item *pat;
1149 char *name;
1150 int i;
1151 int matching_refs = -1;
1152 for (i = 0; i < rs->nr; i++) {
1153 const struct refspec_item *item = &rs->items[i];
1154 if (item->matching &&
1155 (matching_refs == -1 || item->force)) {
1156 matching_refs = i;
1157 continue;
1158 }
1159
1160 if (item->pattern) {
1161 const char *dst_side = item->dst ? item->dst : item->src;
1162 int match;
1163 if (direction == FROM_SRC)
1164 match = match_name_with_pattern(item->src, ref->name, dst_side, &name);
1165 else
1166 match = match_name_with_pattern(dst_side, ref->name, item->src, &name);
1167 if (match) {
1168 matching_refs = i;
1169 break;
1170 }
1171 }
1172 }
1173 if (matching_refs == -1)
1174 return NULL;
1175
1176 pat = &rs->items[matching_refs];
1177 if (pat->matching) {
1178 /*
1179 * "matching refs"; traditionally we pushed everything
1180 * including refs outside refs/heads/ hierarchy, but
1181 * that does not make much sense these days.
1182 */
1183 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1184 return NULL;
1185 name = xstrdup(ref->name);
1186 }
1187 if (ret_pat)
1188 *ret_pat = pat;
1189 return name;
1190 }
1191
1192 static struct ref **tail_ref(struct ref **head)
1193 {
1194 struct ref **tail = head;
1195 while (*tail)
1196 tail = &((*tail)->next);
1197 return tail;
1198 }
1199
1200 struct tips {
1201 struct commit **tip;
1202 int nr, alloc;
1203 };
1204
1205 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1206 {
1207 struct commit *commit;
1208
1209 if (is_null_oid(oid))
1210 return;
1211 commit = lookup_commit_reference_gently(the_repository, oid, 1);
1212 if (!commit || (commit->object.flags & TMP_MARK))
1213 return;
1214 commit->object.flags |= TMP_MARK;
1215 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1216 tips->tip[tips->nr++] = commit;
1217 }
1218
1219 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1220 {
1221 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1222 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1223 struct string_list_item *item;
1224 struct ref *ref;
1225 struct tips sent_tips;
1226
1227 /*
1228 * Collect everything we know they would have at the end of
1229 * this push, and collect all tags they have.
1230 */
1231 memset(&sent_tips, 0, sizeof(sent_tips));
1232 for (ref = *dst; ref; ref = ref->next) {
1233 if (ref->peer_ref &&
1234 !is_null_oid(&ref->peer_ref->new_oid))
1235 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1236 else
1237 add_to_tips(&sent_tips, &ref->old_oid);
1238 if (starts_with(ref->name, "refs/tags/"))
1239 string_list_append(&dst_tag, ref->name);
1240 }
1241 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1242
1243 string_list_sort(&dst_tag);
1244
1245 /* Collect tags they do not have. */
1246 for (ref = src; ref; ref = ref->next) {
1247 if (!starts_with(ref->name, "refs/tags/"))
1248 continue; /* not a tag */
1249 if (string_list_has_string(&dst_tag, ref->name))
1250 continue; /* they already have it */
1251 if (oid_object_info(the_repository, &ref->new_oid, NULL) != OBJ_TAG)
1252 continue; /* be conservative */
1253 item = string_list_append(&src_tag, ref->name);
1254 item->util = ref;
1255 }
1256 string_list_clear(&dst_tag, 0);
1257
1258 /*
1259 * At this point, src_tag lists tags that are missing from
1260 * dst, and sent_tips lists the tips we are pushing or those
1261 * that we know they already have. An element in the src_tag
1262 * that is an ancestor of any of the sent_tips needs to be
1263 * sent to the other side.
1264 */
1265 if (sent_tips.nr) {
1266 const int reachable_flag = 1;
1267 struct commit_list *found_commits;
1268 struct commit **src_commits;
1269 int nr_src_commits = 0, alloc_src_commits = 16;
1270 ALLOC_ARRAY(src_commits, alloc_src_commits);
1271
1272 for_each_string_list_item(item, &src_tag) {
1273 struct ref *ref = item->util;
1274 struct commit *commit;
1275
1276 if (is_null_oid(&ref->new_oid))
1277 continue;
1278 commit = lookup_commit_reference_gently(the_repository,
1279 &ref->new_oid,
1280 1);
1281 if (!commit)
1282 /* not pushing a commit, which is not an error */
1283 continue;
1284
1285 ALLOC_GROW(src_commits, nr_src_commits + 1, alloc_src_commits);
1286 src_commits[nr_src_commits++] = commit;
1287 }
1288
1289 found_commits = get_reachable_subset(sent_tips.tip, sent_tips.nr,
1290 src_commits, nr_src_commits,
1291 reachable_flag);
1292
1293 for_each_string_list_item(item, &src_tag) {
1294 struct ref *dst_ref;
1295 struct ref *ref = item->util;
1296 struct commit *commit;
1297
1298 if (is_null_oid(&ref->new_oid))
1299 continue;
1300 commit = lookup_commit_reference_gently(the_repository,
1301 &ref->new_oid,
1302 1);
1303 if (!commit)
1304 /* not pushing a commit, which is not an error */
1305 continue;
1306
1307 /*
1308 * Is this tag, which they do not have, reachable from
1309 * any of the commits we are sending?
1310 */
1311 if (!(commit->object.flags & reachable_flag))
1312 continue;
1313
1314 /* Add it in */
1315 dst_ref = make_linked_ref(ref->name, dst_tail);
1316 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1317 dst_ref->peer_ref = copy_ref(ref);
1318 }
1319
1320 clear_commit_marks_many(nr_src_commits, src_commits, reachable_flag);
1321 free(src_commits);
1322 free_commit_list(found_commits);
1323 }
1324
1325 string_list_clear(&src_tag, 0);
1326 free(sent_tips.tip);
1327 }
1328
1329 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1330 {
1331 for ( ; list; list = list->next)
1332 if (!strcmp(list->name, name))
1333 return (struct ref *)list;
1334 return NULL;
1335 }
1336
1337 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1338 {
1339 for ( ; ref; ref = ref->next)
1340 string_list_append_nodup(ref_index, ref->name)->util = ref;
1341
1342 string_list_sort(ref_index);
1343 }
1344
1345 /*
1346 * Given only the set of local refs, sanity-check the set of push
1347 * refspecs. We can't catch all errors that match_push_refs would,
1348 * but we can catch some errors early before even talking to the
1349 * remote side.
1350 */
1351 int check_push_refs(struct ref *src, struct refspec *rs)
1352 {
1353 int ret = 0;
1354 int i;
1355
1356 for (i = 0; i < rs->nr; i++) {
1357 struct refspec_item *item = &rs->items[i];
1358
1359 if (item->pattern || item->matching)
1360 continue;
1361
1362 ret |= match_explicit_lhs(src, item, NULL, NULL);
1363 }
1364
1365 return ret;
1366 }
1367
1368 /*
1369 * Given the set of refs the local repository has, the set of refs the
1370 * remote repository has, and the refspec used for push, determine
1371 * what remote refs we will update and with what value by setting
1372 * peer_ref (which object is being pushed) and force (if the push is
1373 * forced) in elements of "dst". The function may add new elements to
1374 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1375 */
1376 int match_push_refs(struct ref *src, struct ref **dst,
1377 struct refspec *rs, int flags)
1378 {
1379 int send_all = flags & MATCH_REFS_ALL;
1380 int send_mirror = flags & MATCH_REFS_MIRROR;
1381 int send_prune = flags & MATCH_REFS_PRUNE;
1382 int errs;
1383 struct ref *ref, **dst_tail = tail_ref(dst);
1384 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1385
1386 /* If no refspec is provided, use the default ":" */
1387 if (!rs->nr)
1388 refspec_append(rs, ":");
1389
1390 errs = match_explicit_refs(src, *dst, &dst_tail, rs);
1391
1392 /* pick the remainder */
1393 for (ref = src; ref; ref = ref->next) {
1394 struct string_list_item *dst_item;
1395 struct ref *dst_peer;
1396 const struct refspec_item *pat = NULL;
1397 char *dst_name;
1398
1399 dst_name = get_ref_match(rs, ref, send_mirror, FROM_SRC, &pat);
1400 if (!dst_name)
1401 continue;
1402
1403 if (!dst_ref_index.nr)
1404 prepare_ref_index(&dst_ref_index, *dst);
1405
1406 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1407 dst_peer = dst_item ? dst_item->util : NULL;
1408 if (dst_peer) {
1409 if (dst_peer->peer_ref)
1410 /* We're already sending something to this ref. */
1411 goto free_name;
1412 } else {
1413 if (pat->matching && !(send_all || send_mirror))
1414 /*
1415 * Remote doesn't have it, and we have no
1416 * explicit pattern, and we don't have
1417 * --all or --mirror.
1418 */
1419 goto free_name;
1420
1421 /* Create a new one and link it */
1422 dst_peer = make_linked_ref(dst_name, &dst_tail);
1423 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1424 string_list_insert(&dst_ref_index,
1425 dst_peer->name)->util = dst_peer;
1426 }
1427 dst_peer->peer_ref = copy_ref(ref);
1428 dst_peer->force = pat->force;
1429 free_name:
1430 free(dst_name);
1431 }
1432
1433 string_list_clear(&dst_ref_index, 0);
1434
1435 if (flags & MATCH_REFS_FOLLOW_TAGS)
1436 add_missing_tags(src, dst, &dst_tail);
1437
1438 if (send_prune) {
1439 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1440 /* check for missing refs on the remote */
1441 for (ref = *dst; ref; ref = ref->next) {
1442 char *src_name;
1443
1444 if (ref->peer_ref)
1445 /* We're already sending something to this ref. */
1446 continue;
1447
1448 src_name = get_ref_match(rs, ref, send_mirror, FROM_DST, NULL);
1449 if (src_name) {
1450 if (!src_ref_index.nr)
1451 prepare_ref_index(&src_ref_index, src);
1452 if (!string_list_has_string(&src_ref_index,
1453 src_name))
1454 ref->peer_ref = alloc_delete_ref();
1455 free(src_name);
1456 }
1457 }
1458 string_list_clear(&src_ref_index, 0);
1459 }
1460
1461 if (errs)
1462 return -1;
1463 return 0;
1464 }
1465
1466 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1467 int force_update)
1468 {
1469 struct ref *ref;
1470
1471 for (ref = remote_refs; ref; ref = ref->next) {
1472 int force_ref_update = ref->force || force_update;
1473 int reject_reason = 0;
1474
1475 if (ref->peer_ref)
1476 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1477 else if (!send_mirror)
1478 continue;
1479
1480 ref->deletion = is_null_oid(&ref->new_oid);
1481 if (!ref->deletion &&
1482 oideq(&ref->old_oid, &ref->new_oid)) {
1483 ref->status = REF_STATUS_UPTODATE;
1484 continue;
1485 }
1486
1487 /*
1488 * If the remote ref has moved and is now different
1489 * from what we expect, reject any push.
1490 *
1491 * It also is an error if the user told us to check
1492 * with the remote-tracking branch to find the value
1493 * to expect, but we did not have such a tracking
1494 * branch.
1495 */
1496 if (ref->expect_old_sha1) {
1497 if (!oideq(&ref->old_oid, &ref->old_oid_expect))
1498 reject_reason = REF_STATUS_REJECT_STALE;
1499 else
1500 /* If the ref isn't stale then force the update. */
1501 force_ref_update = 1;
1502 }
1503
1504 /*
1505 * If the update isn't already rejected then check
1506 * the usual "must fast-forward" rules.
1507 *
1508 * Decide whether an individual refspec A:B can be
1509 * pushed. The push will succeed if any of the
1510 * following are true:
1511 *
1512 * (1) the remote reference B does not exist
1513 *
1514 * (2) the remote reference B is being removed (i.e.,
1515 * pushing :B where no source is specified)
1516 *
1517 * (3) the destination is not under refs/tags/, and
1518 * if the old and new value is a commit, the new
1519 * is a descendant of the old.
1520 *
1521 * (4) it is forced using the +A:B notation, or by
1522 * passing the --force argument
1523 */
1524
1525 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1526 if (starts_with(ref->name, "refs/tags/"))
1527 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1528 else if (!has_object_file(&ref->old_oid))
1529 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1530 else if (!lookup_commit_reference_gently(the_repository, &ref->old_oid, 1) ||
1531 !lookup_commit_reference_gently(the_repository, &ref->new_oid, 1))
1532 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1533 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1534 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1535 }
1536
1537 /*
1538 * "--force" will defeat any rejection implemented
1539 * by the rules above.
1540 */
1541 if (!force_ref_update)
1542 ref->status = reject_reason;
1543 else if (reject_reason)
1544 ref->forced_update = 1;
1545 }
1546 }
1547
1548 static void set_merge(struct branch *ret)
1549 {
1550 struct remote *remote;
1551 char *ref;
1552 struct object_id oid;
1553 int i;
1554
1555 if (!ret)
1556 return; /* no branch */
1557 if (ret->merge)
1558 return; /* already run */
1559 if (!ret->remote_name || !ret->merge_nr) {
1560 /*
1561 * no merge config; let's make sure we don't confuse callers
1562 * with a non-zero merge_nr but a NULL merge
1563 */
1564 ret->merge_nr = 0;
1565 return;
1566 }
1567
1568 remote = remote_get(ret->remote_name);
1569
1570 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1571 for (i = 0; i < ret->merge_nr; i++) {
1572 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1573 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1574 if (!remote_find_tracking(remote, ret->merge[i]) ||
1575 strcmp(ret->remote_name, "."))
1576 continue;
1577 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1578 &oid, &ref) == 1)
1579 ret->merge[i]->dst = ref;
1580 else
1581 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1582 }
1583 }
1584
1585 struct branch *branch_get(const char *name)
1586 {
1587 struct branch *ret;
1588
1589 read_config();
1590 if (!name || !*name || !strcmp(name, "HEAD"))
1591 ret = current_branch;
1592 else
1593 ret = make_branch(name, 0);
1594 set_merge(ret);
1595 return ret;
1596 }
1597
1598 int branch_has_merge_config(struct branch *branch)
1599 {
1600 return branch && !!branch->merge;
1601 }
1602
1603 int branch_merge_matches(struct branch *branch,
1604 int i,
1605 const char *refname)
1606 {
1607 if (!branch || i < 0 || i >= branch->merge_nr)
1608 return 0;
1609 return refname_match(branch->merge[i]->src, refname);
1610 }
1611
1612 __attribute__((format (printf,2,3)))
1613 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1614 {
1615 if (err) {
1616 va_list ap;
1617 va_start(ap, fmt);
1618 strbuf_vaddf(err, fmt, ap);
1619 va_end(ap);
1620 }
1621 return NULL;
1622 }
1623
1624 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1625 {
1626 if (!branch)
1627 return error_buf(err, _("HEAD does not point to a branch"));
1628
1629 if (!branch->merge || !branch->merge[0]) {
1630 /*
1631 * no merge config; is it because the user didn't define any,
1632 * or because it is not a real branch, and get_branch
1633 * auto-vivified it?
1634 */
1635 if (!ref_exists(branch->refname))
1636 return error_buf(err, _("no such branch: '%s'"),
1637 branch->name);
1638 return error_buf(err,
1639 _("no upstream configured for branch '%s'"),
1640 branch->name);
1641 }
1642
1643 if (!branch->merge[0]->dst)
1644 return error_buf(err,
1645 _("upstream branch '%s' not stored as a remote-tracking branch"),
1646 branch->merge[0]->src);
1647
1648 return branch->merge[0]->dst;
1649 }
1650
1651 static const char *tracking_for_push_dest(struct remote *remote,
1652 const char *refname,
1653 struct strbuf *err)
1654 {
1655 char *ret;
1656
1657 ret = apply_refspecs(&remote->fetch, refname);
1658 if (!ret)
1659 return error_buf(err,
1660 _("push destination '%s' on remote '%s' has no local tracking branch"),
1661 refname, remote->name);
1662 return ret;
1663 }
1664
1665 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1666 {
1667 struct remote *remote;
1668
1669 remote = remote_get(pushremote_for_branch(branch, NULL));
1670 if (!remote)
1671 return error_buf(err,
1672 _("branch '%s' has no remote for pushing"),
1673 branch->name);
1674
1675 if (remote->push.nr) {
1676 char *dst;
1677 const char *ret;
1678
1679 dst = apply_refspecs(&remote->push, branch->refname);
1680 if (!dst)
1681 return error_buf(err,
1682 _("push refspecs for '%s' do not include '%s'"),
1683 remote->name, branch->name);
1684
1685 ret = tracking_for_push_dest(remote, dst, err);
1686 free(dst);
1687 return ret;
1688 }
1689
1690 if (remote->mirror)
1691 return tracking_for_push_dest(remote, branch->refname, err);
1692
1693 switch (push_default) {
1694 case PUSH_DEFAULT_NOTHING:
1695 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1696
1697 case PUSH_DEFAULT_MATCHING:
1698 case PUSH_DEFAULT_CURRENT:
1699 return tracking_for_push_dest(remote, branch->refname, err);
1700
1701 case PUSH_DEFAULT_UPSTREAM:
1702 return branch_get_upstream(branch, err);
1703
1704 case PUSH_DEFAULT_UNSPECIFIED:
1705 case PUSH_DEFAULT_SIMPLE:
1706 {
1707 const char *up, *cur;
1708
1709 up = branch_get_upstream(branch, err);
1710 if (!up)
1711 return NULL;
1712 cur = tracking_for_push_dest(remote, branch->refname, err);
1713 if (!cur)
1714 return NULL;
1715 if (strcmp(cur, up))
1716 return error_buf(err,
1717 _("cannot resolve 'simple' push to a single destination"));
1718 return cur;
1719 }
1720 }
1721
1722 BUG("unhandled push situation");
1723 }
1724
1725 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1726 {
1727 if (!branch)
1728 return error_buf(err, _("HEAD does not point to a branch"));
1729
1730 if (!branch->push_tracking_ref)
1731 branch->push_tracking_ref = branch_get_push_1(branch, err);
1732 return branch->push_tracking_ref;
1733 }
1734
1735 static int ignore_symref_update(const char *refname)
1736 {
1737 int flag;
1738
1739 if (!resolve_ref_unsafe(refname, 0, NULL, &flag))
1740 return 0; /* non-existing refs are OK */
1741 return (flag & REF_ISSYMREF);
1742 }
1743
1744 /*
1745 * Create and return a list of (struct ref) consisting of copies of
1746 * each remote_ref that matches refspec. refspec must be a pattern.
1747 * Fill in the copies' peer_ref to describe the local tracking refs to
1748 * which they map. Omit any references that would map to an existing
1749 * local symbolic ref.
1750 */
1751 static struct ref *get_expanded_map(const struct ref *remote_refs,
1752 const struct refspec_item *refspec)
1753 {
1754 const struct ref *ref;
1755 struct ref *ret = NULL;
1756 struct ref **tail = &ret;
1757
1758 for (ref = remote_refs; ref; ref = ref->next) {
1759 char *expn_name = NULL;
1760
1761 if (strchr(ref->name, '^'))
1762 continue; /* a dereference item */
1763 if (match_name_with_pattern(refspec->src, ref->name,
1764 refspec->dst, &expn_name) &&
1765 !ignore_symref_update(expn_name)) {
1766 struct ref *cpy = copy_ref(ref);
1767
1768 cpy->peer_ref = alloc_ref(expn_name);
1769 if (refspec->force)
1770 cpy->peer_ref->force = 1;
1771 *tail = cpy;
1772 tail = &cpy->next;
1773 }
1774 free(expn_name);
1775 }
1776
1777 return ret;
1778 }
1779
1780 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1781 {
1782 const struct ref *ref;
1783 const struct ref *best_match = NULL;
1784 int best_score = 0;
1785
1786 for (ref = refs; ref; ref = ref->next) {
1787 int score = refname_match(name, ref->name);
1788
1789 if (best_score < score) {
1790 best_match = ref;
1791 best_score = score;
1792 }
1793 }
1794 return best_match;
1795 }
1796
1797 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1798 {
1799 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1800
1801 if (!ref)
1802 return NULL;
1803
1804 return copy_ref(ref);
1805 }
1806
1807 static struct ref *get_local_ref(const char *name)
1808 {
1809 if (!name || name[0] == '\0')
1810 return NULL;
1811
1812 if (starts_with(name, "refs/"))
1813 return alloc_ref(name);
1814
1815 if (starts_with(name, "heads/") ||
1816 starts_with(name, "tags/") ||
1817 starts_with(name, "remotes/"))
1818 return alloc_ref_with_prefix("refs/", 5, name);
1819
1820 return alloc_ref_with_prefix("refs/heads/", 11, name);
1821 }
1822
1823 int get_fetch_map(const struct ref *remote_refs,
1824 const struct refspec_item *refspec,
1825 struct ref ***tail,
1826 int missing_ok)
1827 {
1828 struct ref *ref_map, **rmp;
1829
1830 if (refspec->pattern) {
1831 ref_map = get_expanded_map(remote_refs, refspec);
1832 } else {
1833 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1834
1835 if (refspec->exact_sha1) {
1836 ref_map = alloc_ref(name);
1837 get_oid_hex(name, &ref_map->old_oid);
1838 ref_map->exact_oid = 1;
1839 } else {
1840 ref_map = get_remote_ref(remote_refs, name);
1841 }
1842 if (!missing_ok && !ref_map)
1843 die(_("couldn't find remote ref %s"), name);
1844 if (ref_map) {
1845 ref_map->peer_ref = get_local_ref(refspec->dst);
1846 if (ref_map->peer_ref && refspec->force)
1847 ref_map->peer_ref->force = 1;
1848 }
1849 }
1850
1851 for (rmp = &ref_map; *rmp; ) {
1852 if ((*rmp)->peer_ref) {
1853 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1854 check_refname_format((*rmp)->peer_ref->name, 0)) {
1855 struct ref *ignore = *rmp;
1856 error(_("* Ignoring funny ref '%s' locally"),
1857 (*rmp)->peer_ref->name);
1858 *rmp = (*rmp)->next;
1859 free(ignore->peer_ref);
1860 free(ignore);
1861 continue;
1862 }
1863 }
1864 rmp = &((*rmp)->next);
1865 }
1866
1867 if (ref_map)
1868 tail_link_ref(ref_map, tail);
1869
1870 return 0;
1871 }
1872
1873 int resolve_remote_symref(struct ref *ref, struct ref *list)
1874 {
1875 if (!ref->symref)
1876 return 0;
1877 for (; list; list = list->next)
1878 if (!strcmp(ref->symref, list->name)) {
1879 oidcpy(&ref->old_oid, &list->old_oid);
1880 return 0;
1881 }
1882 return 1;
1883 }
1884
1885 /*
1886 * Compute the commit ahead/behind values for the pair branch_name, base.
1887 *
1888 * If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
1889 * counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
1890 * the (potentially expensive) a/b computation (*num_ours and *num_theirs are
1891 * set to zero).
1892 *
1893 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., ref
1894 * does not exist). Returns 0 if the commits are identical. Returns 1 if
1895 * commits are different.
1896 */
1897
1898 static int stat_branch_pair(const char *branch_name, const char *base,
1899 int *num_ours, int *num_theirs,
1900 enum ahead_behind_flags abf)
1901 {
1902 struct object_id oid;
1903 struct commit *ours, *theirs;
1904 struct rev_info revs;
1905 struct argv_array argv = ARGV_ARRAY_INIT;
1906
1907 /* Cannot stat if what we used to build on no longer exists */
1908 if (read_ref(base, &oid))
1909 return -1;
1910 theirs = lookup_commit_reference(the_repository, &oid);
1911 if (!theirs)
1912 return -1;
1913
1914 if (read_ref(branch_name, &oid))
1915 return -1;
1916 ours = lookup_commit_reference(the_repository, &oid);
1917 if (!ours)
1918 return -1;
1919
1920 *num_theirs = *num_ours = 0;
1921
1922 /* are we the same? */
1923 if (theirs == ours)
1924 return 0;
1925 if (abf == AHEAD_BEHIND_QUICK)
1926 return 1;
1927 if (abf != AHEAD_BEHIND_FULL)
1928 BUG("stat_branch_pair: invalid abf '%d'", abf);
1929
1930 /* Run "rev-list --left-right ours...theirs" internally... */
1931 argv_array_push(&argv, ""); /* ignored */
1932 argv_array_push(&argv, "--left-right");
1933 argv_array_pushf(&argv, "%s...%s",
1934 oid_to_hex(&ours->object.oid),
1935 oid_to_hex(&theirs->object.oid));
1936 argv_array_push(&argv, "--");
1937
1938 repo_init_revisions(the_repository, &revs, NULL);
1939 setup_revisions(argv.argc, argv.argv, &revs, NULL);
1940 if (prepare_revision_walk(&revs))
1941 die(_("revision walk setup failed"));
1942
1943 /* ... and count the commits on each side. */
1944 while (1) {
1945 struct commit *c = get_revision(&revs);
1946 if (!c)
1947 break;
1948 if (c->object.flags & SYMMETRIC_LEFT)
1949 (*num_ours)++;
1950 else
1951 (*num_theirs)++;
1952 }
1953
1954 /* clear object flags smudged by the above traversal */
1955 clear_commit_marks(ours, ALL_REV_FLAGS);
1956 clear_commit_marks(theirs, ALL_REV_FLAGS);
1957
1958 argv_array_clear(&argv);
1959 return 1;
1960 }
1961
1962 /*
1963 * Lookup the tracking branch for the given branch and if present, optionally
1964 * compute the commit ahead/behind values for the pair.
1965 *
1966 * If for_push is true, the tracking branch refers to the push branch,
1967 * otherwise it refers to the upstream branch.
1968 *
1969 * The name of the tracking branch (or NULL if it is not defined) is
1970 * returned via *tracking_name, if it is not itself NULL.
1971 *
1972 * If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
1973 * counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
1974 * the (potentially expensive) a/b computation (*num_ours and *num_theirs are
1975 * set to zero).
1976 *
1977 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1978 * upstream defined, or ref does not exist). Returns 0 if the commits are
1979 * identical. Returns 1 if commits are different.
1980 */
1981 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1982 const char **tracking_name, int for_push,
1983 enum ahead_behind_flags abf)
1984 {
1985 const char *base;
1986
1987 /* Cannot stat unless we are marked to build on top of somebody else. */
1988 base = for_push ? branch_get_push(branch, NULL) :
1989 branch_get_upstream(branch, NULL);
1990 if (tracking_name)
1991 *tracking_name = base;
1992 if (!base)
1993 return -1;
1994
1995 return stat_branch_pair(branch->refname, base, num_ours, num_theirs, abf);
1996 }
1997
1998 /*
1999 * Return true when there is anything to report, otherwise false.
2000 */
2001 int format_tracking_info(struct branch *branch, struct strbuf *sb,
2002 enum ahead_behind_flags abf)
2003 {
2004 int ours, theirs, sti;
2005 const char *full_base;
2006 char *base;
2007 int upstream_is_gone = 0;
2008
2009 sti = stat_tracking_info(branch, &ours, &theirs, &full_base, 0, abf);
2010 if (sti < 0) {
2011 if (!full_base)
2012 return 0;
2013 upstream_is_gone = 1;
2014 }
2015
2016 base = shorten_unambiguous_ref(full_base, 0);
2017 if (upstream_is_gone) {
2018 strbuf_addf(sb,
2019 _("Your branch is based on '%s', but the upstream is gone.\n"),
2020 base);
2021 if (advice_status_hints)
2022 strbuf_addstr(sb,
2023 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2024 } else if (!sti) {
2025 strbuf_addf(sb,
2026 _("Your branch is up to date with '%s'.\n"),
2027 base);
2028 } else if (abf == AHEAD_BEHIND_QUICK) {
2029 strbuf_addf(sb,
2030 _("Your branch and '%s' refer to different commits.\n"),
2031 base);
2032 if (advice_status_hints)
2033 strbuf_addf(sb, _(" (use \"%s\" for details)\n"),
2034 "git status --ahead-behind");
2035 } else if (!theirs) {
2036 strbuf_addf(sb,
2037 Q_("Your branch is ahead of '%s' by %d commit.\n",
2038 "Your branch is ahead of '%s' by %d commits.\n",
2039 ours),
2040 base, ours);
2041 if (advice_status_hints)
2042 strbuf_addstr(sb,
2043 _(" (use \"git push\" to publish your local commits)\n"));
2044 } else if (!ours) {
2045 strbuf_addf(sb,
2046 Q_("Your branch is behind '%s' by %d commit, "
2047 "and can be fast-forwarded.\n",
2048 "Your branch is behind '%s' by %d commits, "
2049 "and can be fast-forwarded.\n",
2050 theirs),
2051 base, theirs);
2052 if (advice_status_hints)
2053 strbuf_addstr(sb,
2054 _(" (use \"git pull\" to update your local branch)\n"));
2055 } else {
2056 strbuf_addf(sb,
2057 Q_("Your branch and '%s' have diverged,\n"
2058 "and have %d and %d different commit each, "
2059 "respectively.\n",
2060 "Your branch and '%s' have diverged,\n"
2061 "and have %d and %d different commits each, "
2062 "respectively.\n",
2063 ours + theirs),
2064 base, ours, theirs);
2065 if (advice_status_hints)
2066 strbuf_addstr(sb,
2067 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2068 }
2069 free(base);
2070 return 1;
2071 }
2072
2073 static int one_local_ref(const char *refname, const struct object_id *oid,
2074 int flag, void *cb_data)
2075 {
2076 struct ref ***local_tail = cb_data;
2077 struct ref *ref;
2078
2079 /* we already know it starts with refs/ to get here */
2080 if (check_refname_format(refname + 5, 0))
2081 return 0;
2082
2083 ref = alloc_ref(refname);
2084 oidcpy(&ref->new_oid, oid);
2085 **local_tail = ref;
2086 *local_tail = &ref->next;
2087 return 0;
2088 }
2089
2090 struct ref *get_local_heads(void)
2091 {
2092 struct ref *local_refs = NULL, **local_tail = &local_refs;
2093
2094 for_each_ref(one_local_ref, &local_tail);
2095 return local_refs;
2096 }
2097
2098 struct ref *guess_remote_head(const struct ref *head,
2099 const struct ref *refs,
2100 int all)
2101 {
2102 const struct ref *r;
2103 struct ref *list = NULL;
2104 struct ref **tail = &list;
2105
2106 if (!head)
2107 return NULL;
2108
2109 /*
2110 * Some transports support directly peeking at
2111 * where HEAD points; if that is the case, then
2112 * we don't have to guess.
2113 */
2114 if (head->symref)
2115 return copy_ref(find_ref_by_name(refs, head->symref));
2116
2117 /* If refs/heads/master could be right, it is. */
2118 if (!all) {
2119 r = find_ref_by_name(refs, "refs/heads/master");
2120 if (r && oideq(&r->old_oid, &head->old_oid))
2121 return copy_ref(r);
2122 }
2123
2124 /* Look for another ref that points there */
2125 for (r = refs; r; r = r->next) {
2126 if (r != head &&
2127 starts_with(r->name, "refs/heads/") &&
2128 oideq(&r->old_oid, &head->old_oid)) {
2129 *tail = copy_ref(r);
2130 tail = &((*tail)->next);
2131 if (!all)
2132 break;
2133 }
2134 }
2135
2136 return list;
2137 }
2138
2139 struct stale_heads_info {
2140 struct string_list *ref_names;
2141 struct ref **stale_refs_tail;
2142 struct refspec *rs;
2143 };
2144
2145 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2146 int flags, void *cb_data)
2147 {
2148 struct stale_heads_info *info = cb_data;
2149 struct string_list matches = STRING_LIST_INIT_DUP;
2150 struct refspec_item query;
2151 int i, stale = 1;
2152 memset(&query, 0, sizeof(struct refspec_item));
2153 query.dst = (char *)refname;
2154
2155 query_refspecs_multiple(info->rs, &query, &matches);
2156 if (matches.nr == 0)
2157 goto clean_exit; /* No matches */
2158
2159 /*
2160 * If we did find a suitable refspec and it's not a symref and
2161 * it's not in the list of refs that currently exist in that
2162 * remote, we consider it to be stale. In order to deal with
2163 * overlapping refspecs, we need to go over all of the
2164 * matching refs.
2165 */
2166 if (flags & REF_ISSYMREF)
2167 goto clean_exit;
2168
2169 for (i = 0; stale && i < matches.nr; i++)
2170 if (string_list_has_string(info->ref_names, matches.items[i].string))
2171 stale = 0;
2172
2173 if (stale) {
2174 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2175 oidcpy(&ref->new_oid, oid);
2176 }
2177
2178 clean_exit:
2179 string_list_clear(&matches, 0);
2180 return 0;
2181 }
2182
2183 struct ref *get_stale_heads(struct refspec *rs, struct ref *fetch_map)
2184 {
2185 struct ref *ref, *stale_refs = NULL;
2186 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2187 struct stale_heads_info info;
2188
2189 info.ref_names = &ref_names;
2190 info.stale_refs_tail = &stale_refs;
2191 info.rs = rs;
2192 for (ref = fetch_map; ref; ref = ref->next)
2193 string_list_append(&ref_names, ref->name);
2194 string_list_sort(&ref_names);
2195 for_each_ref(get_stale_heads_cb, &info);
2196 string_list_clear(&ref_names, 0);
2197 return stale_refs;
2198 }
2199
2200 /*
2201 * Compare-and-swap
2202 */
2203 static void clear_cas_option(struct push_cas_option *cas)
2204 {
2205 int i;
2206
2207 for (i = 0; i < cas->nr; i++)
2208 free(cas->entry[i].refname);
2209 free(cas->entry);
2210 memset(cas, 0, sizeof(*cas));
2211 }
2212
2213 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2214 const char *refname,
2215 size_t refnamelen)
2216 {
2217 struct push_cas *entry;
2218 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2219 entry = &cas->entry[cas->nr++];
2220 memset(entry, 0, sizeof(*entry));
2221 entry->refname = xmemdupz(refname, refnamelen);
2222 return entry;
2223 }
2224
2225 static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2226 {
2227 const char *colon;
2228 struct push_cas *entry;
2229
2230 if (unset) {
2231 /* "--no-<option>" */
2232 clear_cas_option(cas);
2233 return 0;
2234 }
2235
2236 if (!arg) {
2237 /* just "--<option>" */
2238 cas->use_tracking_for_rest = 1;
2239 return 0;
2240 }
2241
2242 /* "--<option>=refname" or "--<option>=refname:value" */
2243 colon = strchrnul(arg, ':');
2244 entry = add_cas_entry(cas, arg, colon - arg);
2245 if (!*colon)
2246 entry->use_tracking = 1;
2247 else if (!colon[1])
2248 oidclr(&entry->expect);
2249 else if (get_oid(colon + 1, &entry->expect))
2250 return error(_("cannot parse expected object name '%s'"),
2251 colon + 1);
2252 return 0;
2253 }
2254
2255 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2256 {
2257 return parse_push_cas_option(opt->value, arg, unset);
2258 }
2259
2260 int is_empty_cas(const struct push_cas_option *cas)
2261 {
2262 return !cas->use_tracking_for_rest && !cas->nr;
2263 }
2264
2265 /*
2266 * Look at remote.fetch refspec and see if we have a remote
2267 * tracking branch for the refname there. Fill its current
2268 * value in sha1[].
2269 * If we cannot do so, return negative to signal an error.
2270 */
2271 static int remote_tracking(struct remote *remote, const char *refname,
2272 struct object_id *oid)
2273 {
2274 char *dst;
2275
2276 dst = apply_refspecs(&remote->fetch, refname);
2277 if (!dst)
2278 return -1; /* no tracking ref for refname at remote */
2279 if (read_ref(dst, oid))
2280 return -1; /* we know what the tracking ref is but we cannot read it */
2281 return 0;
2282 }
2283
2284 static void apply_cas(struct push_cas_option *cas,
2285 struct remote *remote,
2286 struct ref *ref)
2287 {
2288 int i;
2289
2290 /* Find an explicit --<option>=<name>[:<value>] entry */
2291 for (i = 0; i < cas->nr; i++) {
2292 struct push_cas *entry = &cas->entry[i];
2293 if (!refname_match(entry->refname, ref->name))
2294 continue;
2295 ref->expect_old_sha1 = 1;
2296 if (!entry->use_tracking)
2297 oidcpy(&ref->old_oid_expect, &entry->expect);
2298 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2299 oidclr(&ref->old_oid_expect);
2300 return;
2301 }
2302
2303 /* Are we using "--<option>" to cover all? */
2304 if (!cas->use_tracking_for_rest)
2305 return;
2306
2307 ref->expect_old_sha1 = 1;
2308 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2309 oidclr(&ref->old_oid_expect);
2310 }
2311
2312 void apply_push_cas(struct push_cas_option *cas,
2313 struct remote *remote,
2314 struct ref *remote_refs)
2315 {
2316 struct ref *ref;
2317 for (ref = remote_refs; ref; ref = ref->next)
2318 apply_cas(cas, remote, ref);
2319 }
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