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hashmap_get{,_from_hash} return "struct hashmap_entry *"
[git/gitster.git] / remote.c
blobed95ae6ed6697f64c16c6ca27cf938e9bb943d1b
1 #include "cache.h"
2 #include "config.h"
3 #include "remote.h"
4 #include "refs.h"
5 #include "refspec.h"
6 #include "object-store.h"
7 #include "commit.h"
8 #include "diff.h"
9 #include "revision.h"
10 #include "dir.h"
11 #include "tag.h"
12 #include "string-list.h"
13 #include "mergesort.h"
14 #include "argv-array.h"
15 #include "commit-reach.h"
16 #include "advice.h"
17
18 enum map_direction { FROM_SRC, FROM_DST };
19
20 struct counted_string {
21 size_t len;
22 const char *s;
23 };
24 struct rewrite {
25 const char *base;
26 size_t baselen;
27 struct counted_string *instead_of;
28 int instead_of_nr;
29 int instead_of_alloc;
30 };
31 struct rewrites {
32 struct rewrite **rewrite;
33 int rewrite_alloc;
34 int rewrite_nr;
35 };
36
37 static struct remote **remotes;
38 static int remotes_alloc;
39 static int remotes_nr;
40 static struct hashmap remotes_hash;
41
42 static struct branch **branches;
43 static int branches_alloc;
44 static int branches_nr;
45
46 static struct branch *current_branch;
47 static const char *pushremote_name;
48
49 static struct rewrites rewrites;
50 static struct rewrites rewrites_push;
51
52 static int valid_remote(const struct remote *remote)
53 {
54 return (!!remote->url) || (!!remote->foreign_vcs);
55 }
56
57 static const char *alias_url(const char *url, struct rewrites *r)
58 {
59 int i, j;
60 struct counted_string *longest;
61 int longest_i;
62
63 longest = NULL;
64 longest_i = -1;
65 for (i = 0; i < r->rewrite_nr; i++) {
66 if (!r->rewrite[i])
67 continue;
68 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
69 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
70 (!longest ||
71 longest->len < r->rewrite[i]->instead_of[j].len)) {
72 longest = &(r->rewrite[i]->instead_of[j]);
73 longest_i = i;
74 }
75 }
76 }
77 if (!longest)
78 return url;
79
80 return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
81 }
82
83 static void add_url(struct remote *remote, const char *url)
84 {
85 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
86 remote->url[remote->url_nr++] = url;
87 }
88
89 static void add_pushurl(struct remote *remote, const char *pushurl)
90 {
91 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
92 remote->pushurl[remote->pushurl_nr++] = pushurl;
93 }
94
95 static void add_pushurl_alias(struct remote *remote, const char *url)
96 {
97 const char *pushurl = alias_url(url, &rewrites_push);
98 if (pushurl != url)
99 add_pushurl(remote, pushurl);
100 }
101
102 static void add_url_alias(struct remote *remote, const char *url)
103 {
104 add_url(remote, alias_url(url, &rewrites));
105 add_pushurl_alias(remote, url);
106 }
107
108 struct remotes_hash_key {
109 const char *str;
110 int len;
111 };
112
113 static int remotes_hash_cmp(const void *unused_cmp_data,
114 const void *entry,
115 const void *entry_or_key,
116 const void *keydata)
117 {
118 const struct remote *a = entry;
119 const struct remote *b = entry_or_key;
120 const struct remotes_hash_key *key = keydata;
121
122 if (key)
123 return strncmp(a->name, key->str, key->len) || a->name[key->len];
124 else
125 return strcmp(a->name, b->name);
126 }
127
128 static inline void init_remotes_hash(void)
129 {
130 if (!remotes_hash.cmpfn)
131 hashmap_init(&remotes_hash, remotes_hash_cmp, NULL, 0);
132 }
133
134 static struct remote *make_remote(const char *name, int len)
135 {
136 struct remote *ret, *replaced;
137 struct remotes_hash_key lookup;
138 struct hashmap_entry lookup_entry, *e;
139
140 if (!len)
141 len = strlen(name);
142
143 init_remotes_hash();
144 lookup.str = name;
145 lookup.len = len;
146 hashmap_entry_init(&lookup_entry, memhash(name, len));
147
148 e = hashmap_get(&remotes_hash, &lookup_entry, &lookup);
149 if (e)
150 return container_of(e, struct remote, ent);
151
152 ret = xcalloc(1, sizeof(struct remote));
153 ret->prune = -1; /* unspecified */
154 ret->prune_tags = -1; /* unspecified */
155 ret->name = xstrndup(name, len);
156 refspec_init(&ret->push, REFSPEC_PUSH);
157 refspec_init(&ret->fetch, REFSPEC_FETCH);
158
159 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
160 remotes[remotes_nr++] = ret;
161
162 hashmap_entry_init(&ret->ent, lookup_entry.hash);
163 replaced = hashmap_put(&remotes_hash, &ret->ent);
164 assert(replaced == NULL); /* no previous entry overwritten */
165 return ret;
166 }
167
168 static void add_merge(struct branch *branch, const char *name)
169 {
170 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
171 branch->merge_alloc);
172 branch->merge_name[branch->merge_nr++] = name;
173 }
174
175 static struct branch *make_branch(const char *name, int len)
176 {
177 struct branch *ret;
178 int i;
179
180 for (i = 0; i < branches_nr; i++) {
181 if (len ? (!strncmp(name, branches[i]->name, len) &&
182 !branches[i]->name[len]) :
183 !strcmp(name, branches[i]->name))
184 return branches[i];
185 }
186
187 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
188 ret = xcalloc(1, sizeof(struct branch));
189 branches[branches_nr++] = ret;
190 if (len)
191 ret->name = xstrndup(name, len);
192 else
193 ret->name = xstrdup(name);
194 ret->refname = xstrfmt("refs/heads/%s", ret->name);
195
196 return ret;
197 }
198
199 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
200 {
201 struct rewrite *ret;
202 int i;
203
204 for (i = 0; i < r->rewrite_nr; i++) {
205 if (len
206 ? (len == r->rewrite[i]->baselen &&
207 !strncmp(base, r->rewrite[i]->base, len))
208 : !strcmp(base, r->rewrite[i]->base))
209 return r->rewrite[i];
210 }
211
212 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
213 ret = xcalloc(1, sizeof(struct rewrite));
214 r->rewrite[r->rewrite_nr++] = ret;
215 if (len) {
216 ret->base = xstrndup(base, len);
217 ret->baselen = len;
218 }
219 else {
220 ret->base = xstrdup(base);
221 ret->baselen = strlen(base);
222 }
223 return ret;
224 }
225
226 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
227 {
228 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
229 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
230 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
231 rewrite->instead_of_nr++;
232 }
233
234 static const char *skip_spaces(const char *s)
235 {
236 while (isspace(*s))
237 s++;
238 return s;
239 }
240
241 static void read_remotes_file(struct remote *remote)
242 {
243 struct strbuf buf = STRBUF_INIT;
244 FILE *f = fopen_or_warn(git_path("remotes/%s", remote->name), "r");
245
246 if (!f)
247 return;
248 remote->configured_in_repo = 1;
249 remote->origin = REMOTE_REMOTES;
250 while (strbuf_getline(&buf, f) != EOF) {
251 const char *v;
252
253 strbuf_rtrim(&buf);
254
255 if (skip_prefix(buf.buf, "URL:", &v))
256 add_url_alias(remote, xstrdup(skip_spaces(v)));
257 else if (skip_prefix(buf.buf, "Push:", &v))
258 refspec_append(&remote->push, skip_spaces(v));
259 else if (skip_prefix(buf.buf, "Pull:", &v))
260 refspec_append(&remote->fetch, skip_spaces(v));
261 }
262 strbuf_release(&buf);
263 fclose(f);
264 }
265
266 static void read_branches_file(struct remote *remote)
267 {
268 char *frag;
269 struct strbuf buf = STRBUF_INIT;
270 FILE *f = fopen_or_warn(git_path("branches/%s", remote->name), "r");
271
272 if (!f)
273 return;
274
275 strbuf_getline_lf(&buf, f);
276 fclose(f);
277 strbuf_trim(&buf);
278 if (!buf.len) {
279 strbuf_release(&buf);
280 return;
281 }
282
283 remote->configured_in_repo = 1;
284 remote->origin = REMOTE_BRANCHES;
285
286 /*
287 * The branches file would have URL and optionally
288 * #branch specified. The "master" (or specified) branch is
289 * fetched and stored in the local branch matching the
290 * remote name.
291 */
292 frag = strchr(buf.buf, '#');
293 if (frag)
294 *(frag++) = '\0';
295 else
296 frag = "master";
297
298 add_url_alias(remote, strbuf_detach(&buf, NULL));
299 strbuf_addf(&buf, "refs/heads/%s:refs/heads/%s",
300 frag, remote->name);
301 refspec_append(&remote->fetch, buf.buf);
302
303 /*
304 * Cogito compatible push: push current HEAD to remote #branch
305 * (master if missing)
306 */
307 strbuf_reset(&buf);
308 strbuf_addf(&buf, "HEAD:refs/heads/%s", frag);
309 refspec_append(&remote->push, buf.buf);
310 remote->fetch_tags = 1; /* always auto-follow */
311 strbuf_release(&buf);
312 }
313
314 static int handle_config(const char *key, const char *value, void *cb)
315 {
316 const char *name;
317 int namelen;
318 const char *subkey;
319 struct remote *remote;
320 struct branch *branch;
321 if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
322 if (!name)
323 return 0;
324 branch = make_branch(name, namelen);
325 if (!strcmp(subkey, "remote")) {
326 return git_config_string(&branch->remote_name, key, value);
327 } else if (!strcmp(subkey, "pushremote")) {
328 return git_config_string(&branch->pushremote_name, key, value);
329 } else if (!strcmp(subkey, "merge")) {
330 if (!value)
331 return config_error_nonbool(key);
332 add_merge(branch, xstrdup(value));
333 }
334 return 0;
335 }
336 if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
337 struct rewrite *rewrite;
338 if (!name)
339 return 0;
340 if (!strcmp(subkey, "insteadof")) {
341 if (!value)
342 return config_error_nonbool(key);
343 rewrite = make_rewrite(&rewrites, name, namelen);
344 add_instead_of(rewrite, xstrdup(value));
345 } else if (!strcmp(subkey, "pushinsteadof")) {
346 if (!value)
347 return config_error_nonbool(key);
348 rewrite = make_rewrite(&rewrites_push, name, namelen);
349 add_instead_of(rewrite, xstrdup(value));
350 }
351 }
352
353 if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
354 return 0;
355
356 /* Handle remote.* variables */
357 if (!name && !strcmp(subkey, "pushdefault"))
358 return git_config_string(&pushremote_name, key, value);
359
360 if (!name)
361 return 0;
362 /* Handle remote.<name>.* variables */
363 if (*name == '/') {
364 warning(_("config remote shorthand cannot begin with '/': %s"),
365 name);
366 return 0;
367 }
368 remote = make_remote(name, namelen);
369 remote->origin = REMOTE_CONFIG;
370 if (current_config_scope() == CONFIG_SCOPE_REPO)
371 remote->configured_in_repo = 1;
372 if (!strcmp(subkey, "mirror"))
373 remote->mirror = git_config_bool(key, value);
374 else if (!strcmp(subkey, "skipdefaultupdate"))
375 remote->skip_default_update = git_config_bool(key, value);
376 else if (!strcmp(subkey, "skipfetchall"))
377 remote->skip_default_update = git_config_bool(key, value);
378 else if (!strcmp(subkey, "prune"))
379 remote->prune = git_config_bool(key, value);
380 else if (!strcmp(subkey, "prunetags"))
381 remote->prune_tags = git_config_bool(key, value);
382 else if (!strcmp(subkey, "url")) {
383 const char *v;
384 if (git_config_string(&v, key, value))
385 return -1;
386 add_url(remote, v);
387 } else if (!strcmp(subkey, "pushurl")) {
388 const char *v;
389 if (git_config_string(&v, key, value))
390 return -1;
391 add_pushurl(remote, v);
392 } else if (!strcmp(subkey, "push")) {
393 const char *v;
394 if (git_config_string(&v, key, value))
395 return -1;
396 refspec_append(&remote->push, v);
397 free((char *)v);
398 } else if (!strcmp(subkey, "fetch")) {
399 const char *v;
400 if (git_config_string(&v, key, value))
401 return -1;
402 refspec_append(&remote->fetch, v);
403 free((char *)v);
404 } else if (!strcmp(subkey, "receivepack")) {
405 const char *v;
406 if (git_config_string(&v, key, value))
407 return -1;
408 if (!remote->receivepack)
409 remote->receivepack = v;
410 else
411 error(_("more than one receivepack given, using the first"));
412 } else if (!strcmp(subkey, "uploadpack")) {
413 const char *v;
414 if (git_config_string(&v, key, value))
415 return -1;
416 if (!remote->uploadpack)
417 remote->uploadpack = v;
418 else
419 error(_("more than one uploadpack given, using the first"));
420 } else if (!strcmp(subkey, "tagopt")) {
421 if (!strcmp(value, "--no-tags"))
422 remote->fetch_tags = -1;
423 else if (!strcmp(value, "--tags"))
424 remote->fetch_tags = 2;
425 } else if (!strcmp(subkey, "proxy")) {
426 return git_config_string((const char **)&remote->http_proxy,
427 key, value);
428 } else if (!strcmp(subkey, "proxyauthmethod")) {
429 return git_config_string((const char **)&remote->http_proxy_authmethod,
430 key, value);
431 } else if (!strcmp(subkey, "vcs")) {
432 return git_config_string(&remote->foreign_vcs, key, value);
433 }
434 return 0;
435 }
436
437 static void alias_all_urls(void)
438 {
439 int i, j;
440 for (i = 0; i < remotes_nr; i++) {
441 int add_pushurl_aliases;
442 if (!remotes[i])
443 continue;
444 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
445 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
446 }
447 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
448 for (j = 0; j < remotes[i]->url_nr; j++) {
449 if (add_pushurl_aliases)
450 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
451 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
452 }
453 }
454 }
455
456 static void read_config(void)
457 {
458 static int loaded;
459 int flag;
460
461 if (loaded)
462 return;
463 loaded = 1;
464
465 current_branch = NULL;
466 if (startup_info->have_repository) {
467 const char *head_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flag);
468 if (head_ref && (flag & REF_ISSYMREF) &&
469 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
470 current_branch = make_branch(head_ref, 0);
471 }
472 }
473 git_config(handle_config, NULL);
474 alias_all_urls();
475 }
476
477 static int valid_remote_nick(const char *name)
478 {
479 if (!name[0] || is_dot_or_dotdot(name))
480 return 0;
481
482 /* remote nicknames cannot contain slashes */
483 while (*name)
484 if (is_dir_sep(*name++))
485 return 0;
486 return 1;
487 }
488
489 const char *remote_for_branch(struct branch *branch, int *explicit)
490 {
491 if (branch && branch->remote_name) {
492 if (explicit)
493 *explicit = 1;
494 return branch->remote_name;
495 }
496 if (explicit)
497 *explicit = 0;
498 return "origin";
499 }
500
501 const char *pushremote_for_branch(struct branch *branch, int *explicit)
502 {
503 if (branch && branch->pushremote_name) {
504 if (explicit)
505 *explicit = 1;
506 return branch->pushremote_name;
507 }
508 if (pushremote_name) {
509 if (explicit)
510 *explicit = 1;
511 return pushremote_name;
512 }
513 return remote_for_branch(branch, explicit);
514 }
515
516 const char *remote_ref_for_branch(struct branch *branch, int for_push,
517 int *explicit)
518 {
519 if (branch) {
520 if (!for_push) {
521 if (branch->merge_nr) {
522 if (explicit)
523 *explicit = 1;
524 return branch->merge_name[0];
525 }
526 } else {
527 const char *dst, *remote_name =
528 pushremote_for_branch(branch, NULL);
529 struct remote *remote = remote_get(remote_name);
530
531 if (remote && remote->push.nr &&
532 (dst = apply_refspecs(&remote->push,
533 branch->refname))) {
534 if (explicit)
535 *explicit = 1;
536 return dst;
537 }
538 }
539 }
540 if (explicit)
541 *explicit = 0;
542 return "";
543 }
544
545 static struct remote *remote_get_1(const char *name,
546 const char *(*get_default)(struct branch *, int *))
547 {
548 struct remote *ret;
549 int name_given = 0;
550
551 read_config();
552
553 if (name)
554 name_given = 1;
555 else
556 name = get_default(current_branch, &name_given);
557
558 ret = make_remote(name, 0);
559 if (valid_remote_nick(name) && have_git_dir()) {
560 if (!valid_remote(ret))
561 read_remotes_file(ret);
562 if (!valid_remote(ret))
563 read_branches_file(ret);
564 }
565 if (name_given && !valid_remote(ret))
566 add_url_alias(ret, name);
567 if (!valid_remote(ret))
568 return NULL;
569 return ret;
570 }
571
572 struct remote *remote_get(const char *name)
573 {
574 return remote_get_1(name, remote_for_branch);
575 }
576
577 struct remote *pushremote_get(const char *name)
578 {
579 return remote_get_1(name, pushremote_for_branch);
580 }
581
582 int remote_is_configured(struct remote *remote, int in_repo)
583 {
584 if (!remote)
585 return 0;
586 if (in_repo)
587 return remote->configured_in_repo;
588 return !!remote->origin;
589 }
590
591 int for_each_remote(each_remote_fn fn, void *priv)
592 {
593 int i, result = 0;
594 read_config();
595 for (i = 0; i < remotes_nr && !result; i++) {
596 struct remote *r = remotes[i];
597 if (!r)
598 continue;
599 result = fn(r, priv);
600 }
601 return result;
602 }
603
604 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
605 {
606 if (strcmp(ref1->name, ref2->name)) {
607 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
608 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
609 die(_("Cannot fetch both %s and %s to %s"),
610 ref1->name, ref2->name, ref2->peer_ref->name);
611 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
612 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
613 warning(_("%s usually tracks %s, not %s"),
614 ref2->peer_ref->name, ref2->name, ref1->name);
615 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
616 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
617 die(_("%s tracks both %s and %s"),
618 ref2->peer_ref->name, ref1->name, ref2->name);
619 } else {
620 /*
621 * This last possibility doesn't occur because
622 * FETCH_HEAD_IGNORE entries always appear at
623 * the end of the list.
624 */
625 BUG("Internal error");
626 }
627 }
628 free(ref2->peer_ref);
629 free(ref2);
630 }
631
632 struct ref *ref_remove_duplicates(struct ref *ref_map)
633 {
634 struct string_list refs = STRING_LIST_INIT_NODUP;
635 struct ref *retval = NULL;
636 struct ref **p = &retval;
637
638 while (ref_map) {
639 struct ref *ref = ref_map;
640
641 ref_map = ref_map->next;
642 ref->next = NULL;
643
644 if (!ref->peer_ref) {
645 *p = ref;
646 p = &ref->next;
647 } else {
648 struct string_list_item *item =
649 string_list_insert(&refs, ref->peer_ref->name);
650
651 if (item->util) {
652 /* Entry already existed */
653 handle_duplicate((struct ref *)item->util, ref);
654 } else {
655 *p = ref;
656 p = &ref->next;
657 item->util = ref;
658 }
659 }
660 }
661
662 string_list_clear(&refs, 0);
663 return retval;
664 }
665
666 int remote_has_url(struct remote *remote, const char *url)
667 {
668 int i;
669 for (i = 0; i < remote->url_nr; i++) {
670 if (!strcmp(remote->url[i], url))
671 return 1;
672 }
673 return 0;
674 }
675
676 static int match_name_with_pattern(const char *key, const char *name,
677 const char *value, char **result)
678 {
679 const char *kstar = strchr(key, '*');
680 size_t klen;
681 size_t ksuffixlen;
682 size_t namelen;
683 int ret;
684 if (!kstar)
685 die(_("key '%s' of pattern had no '*'"), key);
686 klen = kstar - key;
687 ksuffixlen = strlen(kstar + 1);
688 namelen = strlen(name);
689 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
690 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
691 if (ret && value) {
692 struct strbuf sb = STRBUF_INIT;
693 const char *vstar = strchr(value, '*');
694 if (!vstar)
695 die(_("value '%s' of pattern has no '*'"), value);
696 strbuf_add(&sb, value, vstar - value);
697 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
698 strbuf_addstr(&sb, vstar + 1);
699 *result = strbuf_detach(&sb, NULL);
700 }
701 return ret;
702 }
703
704 static void query_refspecs_multiple(struct refspec *rs,
705 struct refspec_item *query,
706 struct string_list *results)
707 {
708 int i;
709 int find_src = !query->src;
710
711 if (find_src && !query->dst)
712 BUG("query_refspecs_multiple: need either src or dst");
713
714 for (i = 0; i < rs->nr; i++) {
715 struct refspec_item *refspec = &rs->items[i];
716 const char *key = find_src ? refspec->dst : refspec->src;
717 const char *value = find_src ? refspec->src : refspec->dst;
718 const char *needle = find_src ? query->dst : query->src;
719 char **result = find_src ? &query->src : &query->dst;
720
721 if (!refspec->dst)
722 continue;
723 if (refspec->pattern) {
724 if (match_name_with_pattern(key, needle, value, result))
725 string_list_append_nodup(results, *result);
726 } else if (!strcmp(needle, key)) {
727 string_list_append(results, value);
728 }
729 }
730 }
731
732 int query_refspecs(struct refspec *rs, struct refspec_item *query)
733 {
734 int i;
735 int find_src = !query->src;
736 const char *needle = find_src ? query->dst : query->src;
737 char **result = find_src ? &query->src : &query->dst;
738
739 if (find_src && !query->dst)
740 BUG("query_refspecs: need either src or dst");
741
742 for (i = 0; i < rs->nr; i++) {
743 struct refspec_item *refspec = &rs->items[i];
744 const char *key = find_src ? refspec->dst : refspec->src;
745 const char *value = find_src ? refspec->src : refspec->dst;
746
747 if (!refspec->dst)
748 continue;
749 if (refspec->pattern) {
750 if (match_name_with_pattern(key, needle, value, result)) {
751 query->force = refspec->force;
752 return 0;
753 }
754 } else if (!strcmp(needle, key)) {
755 *result = xstrdup(value);
756 query->force = refspec->force;
757 return 0;
758 }
759 }
760 return -1;
761 }
762
763 char *apply_refspecs(struct refspec *rs, const char *name)
764 {
765 struct refspec_item query;
766
767 memset(&query, 0, sizeof(struct refspec_item));
768 query.src = (char *)name;
769
770 if (query_refspecs(rs, &query))
771 return NULL;
772
773 return query.dst;
774 }
775
776 int remote_find_tracking(struct remote *remote, struct refspec_item *refspec)
777 {
778 return query_refspecs(&remote->fetch, refspec);
779 }
780
781 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
782 const char *name)
783 {
784 size_t len = strlen(name);
785 struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
786 memcpy(ref->name, prefix, prefixlen);
787 memcpy(ref->name + prefixlen, name, len);
788 return ref;
789 }
790
791 struct ref *alloc_ref(const char *name)
792 {
793 return alloc_ref_with_prefix("", 0, name);
794 }
795
796 struct ref *copy_ref(const struct ref *ref)
797 {
798 struct ref *cpy;
799 size_t len;
800 if (!ref)
801 return NULL;
802 len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
803 cpy = xmalloc(len);
804 memcpy(cpy, ref, len);
805 cpy->next = NULL;
806 cpy->symref = xstrdup_or_null(ref->symref);
807 cpy->remote_status = xstrdup_or_null(ref->remote_status);
808 cpy->peer_ref = copy_ref(ref->peer_ref);
809 return cpy;
810 }
811
812 struct ref *copy_ref_list(const struct ref *ref)
813 {
814 struct ref *ret = NULL;
815 struct ref **tail = &ret;
816 while (ref) {
817 *tail = copy_ref(ref);
818 ref = ref->next;
819 tail = &((*tail)->next);
820 }
821 return ret;
822 }
823
824 void free_one_ref(struct ref *ref)
825 {
826 if (!ref)
827 return;
828 free_one_ref(ref->peer_ref);
829 free(ref->remote_status);
830 free(ref->symref);
831 free(ref);
832 }
833
834 void free_refs(struct ref *ref)
835 {
836 struct ref *next;
837 while (ref) {
838 next = ref->next;
839 free_one_ref(ref);
840 ref = next;
841 }
842 }
843
844 int ref_compare_name(const void *va, const void *vb)
845 {
846 const struct ref *a = va, *b = vb;
847 return strcmp(a->name, b->name);
848 }
849
850 static void *ref_list_get_next(const void *a)
851 {
852 return ((const struct ref *)a)->next;
853 }
854
855 static void ref_list_set_next(void *a, void *next)
856 {
857 ((struct ref *)a)->next = next;
858 }
859
860 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
861 {
862 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
863 }
864
865 int count_refspec_match(const char *pattern,
866 struct ref *refs,
867 struct ref **matched_ref)
868 {
869 int patlen = strlen(pattern);
870 struct ref *matched_weak = NULL;
871 struct ref *matched = NULL;
872 int weak_match = 0;
873 int match = 0;
874
875 for (weak_match = match = 0; refs; refs = refs->next) {
876 char *name = refs->name;
877 int namelen = strlen(name);
878
879 if (!refname_match(pattern, name))
880 continue;
881
882 /* A match is "weak" if it is with refs outside
883 * heads or tags, and did not specify the pattern
884 * in full (e.g. "refs/remotes/origin/master") or at
885 * least from the toplevel (e.g. "remotes/origin/master");
886 * otherwise "git push $URL master" would result in
887 * ambiguity between remotes/origin/master and heads/master
888 * at the remote site.
889 */
890 if (namelen != patlen &&
891 patlen != namelen - 5 &&
892 !starts_with(name, "refs/heads/") &&
893 !starts_with(name, "refs/tags/")) {
894 /* We want to catch the case where only weak
895 * matches are found and there are multiple
896 * matches, and where more than one strong
897 * matches are found, as ambiguous. One
898 * strong match with zero or more weak matches
899 * are acceptable as a unique match.
900 */
901 matched_weak = refs;
902 weak_match++;
903 }
904 else {
905 matched = refs;
906 match++;
907 }
908 }
909 if (!matched) {
910 if (matched_ref)
911 *matched_ref = matched_weak;
912 return weak_match;
913 }
914 else {
915 if (matched_ref)
916 *matched_ref = matched;
917 return match;
918 }
919 }
920
921 static void tail_link_ref(struct ref *ref, struct ref ***tail)
922 {
923 **tail = ref;
924 while (ref->next)
925 ref = ref->next;
926 *tail = &ref->next;
927 }
928
929 static struct ref *alloc_delete_ref(void)
930 {
931 struct ref *ref = alloc_ref("(delete)");
932 oidclr(&ref->new_oid);
933 return ref;
934 }
935
936 static int try_explicit_object_name(const char *name,
937 struct ref **match)
938 {
939 struct object_id oid;
940
941 if (!*name) {
942 if (match)
943 *match = alloc_delete_ref();
944 return 0;
945 }
946
947 if (get_oid(name, &oid))
948 return -1;
949
950 if (match) {
951 *match = alloc_ref(name);
952 oidcpy(&(*match)->new_oid, &oid);
953 }
954 return 0;
955 }
956
957 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
958 {
959 struct ref *ret = alloc_ref(name);
960 tail_link_ref(ret, tail);
961 return ret;
962 }
963
964 static char *guess_ref(const char *name, struct ref *peer)
965 {
966 struct strbuf buf = STRBUF_INIT;
967
968 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
969 NULL, NULL);
970 if (!r)
971 return NULL;
972
973 if (starts_with(r, "refs/heads/")) {
974 strbuf_addstr(&buf, "refs/heads/");
975 } else if (starts_with(r, "refs/tags/")) {
976 strbuf_addstr(&buf, "refs/tags/");
977 } else {
978 return NULL;
979 }
980
981 strbuf_addstr(&buf, name);
982 return strbuf_detach(&buf, NULL);
983 }
984
985 static int match_explicit_lhs(struct ref *src,
986 struct refspec_item *rs,
987 struct ref **match,
988 int *allocated_match)
989 {
990 switch (count_refspec_match(rs->src, src, match)) {
991 case 1:
992 if (allocated_match)
993 *allocated_match = 0;
994 return 0;
995 case 0:
996 /* The source could be in the get_sha1() format
997 * not a reference name. :refs/other is a
998 * way to delete 'other' ref at the remote end.
999 */
1000 if (try_explicit_object_name(rs->src, match) < 0)
1001 return error(_("src refspec %s does not match any"), rs->src);
1002 if (allocated_match)
1003 *allocated_match = 1;
1004 return 0;
1005 default:
1006 return error(_("src refspec %s matches more than one"), rs->src);
1007 }
1008 }
1009
1010 static void show_push_unqualified_ref_name_error(const char *dst_value,
1011 const char *matched_src_name)
1012 {
1013 struct object_id oid;
1014 enum object_type type;
1015
1016 /*
1017 * TRANSLATORS: "matches '%s'%" is the <dst> part of "git push
1018 * <remote> <src>:<dst>" push, and "being pushed ('%s')" is
1019 * the <src>.
1020 */
1021 error(_("The destination you provided is not a full refname (i.e.,\n"
1022 "starting with \"refs/\"). We tried to guess what you meant by:\n"
1023 "\n"
1024 "- Looking for a ref that matches '%s' on the remote side.\n"
1025 "- Checking if the <src> being pushed ('%s')\n"
1026 " is a ref in \"refs/{heads,tags}/\". If so we add a corresponding\n"
1027 " refs/{heads,tags}/ prefix on the remote side.\n"
1028 "\n"
1029 "Neither worked, so we gave up. You must fully qualify the ref."),
1030 dst_value, matched_src_name);
1031
1032 if (!advice_push_unqualified_ref_name)
1033 return;
1034
1035 if (get_oid(matched_src_name, &oid))
1036 BUG("'%s' is not a valid object, "
1037 "match_explicit_lhs() should catch this!",
1038 matched_src_name);
1039 type = oid_object_info(the_repository, &oid, NULL);
1040 if (type == OBJ_COMMIT) {
1041 advise(_("The <src> part of the refspec is a commit object.\n"
1042 "Did you mean to create a new branch by pushing to\n"
1043 "'%s:refs/heads/%s'?"),
1044 matched_src_name, dst_value);
1045 } else if (type == OBJ_TAG) {
1046 advise(_("The <src> part of the refspec is a tag object.\n"
1047 "Did you mean to create a new tag by pushing to\n"
1048 "'%s:refs/tags/%s'?"),
1049 matched_src_name, dst_value);
1050 } else if (type == OBJ_TREE) {
1051 advise(_("The <src> part of the refspec is a tree object.\n"
1052 "Did you mean to tag a new tree by pushing to\n"
1053 "'%s:refs/tags/%s'?"),
1054 matched_src_name, dst_value);
1055 } else if (type == OBJ_BLOB) {
1056 advise(_("The <src> part of the refspec is a blob object.\n"
1057 "Did you mean to tag a new blob by pushing to\n"
1058 "'%s:refs/tags/%s'?"),
1059 matched_src_name, dst_value);
1060 } else {
1061 BUG("'%s' should be commit/tag/tree/blob, is '%d'",
1062 matched_src_name, type);
1063 }
1064 }
1065
1066 static int match_explicit(struct ref *src, struct ref *dst,
1067 struct ref ***dst_tail,
1068 struct refspec_item *rs)
1069 {
1070 struct ref *matched_src, *matched_dst;
1071 int allocated_src;
1072
1073 const char *dst_value = rs->dst;
1074 char *dst_guess;
1075
1076 if (rs->pattern || rs->matching)
1077 return 0;
1078
1079 matched_src = matched_dst = NULL;
1080 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1081 return -1;
1082
1083 if (!dst_value) {
1084 int flag;
1085
1086 dst_value = resolve_ref_unsafe(matched_src->name,
1087 RESOLVE_REF_READING,
1088 NULL, &flag);
1089 if (!dst_value ||
1090 ((flag & REF_ISSYMREF) &&
1091 !starts_with(dst_value, "refs/heads/")))
1092 die(_("%s cannot be resolved to branch"),
1093 matched_src->name);
1094 }
1095
1096 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1097 case 1:
1098 break;
1099 case 0:
1100 if (starts_with(dst_value, "refs/")) {
1101 matched_dst = make_linked_ref(dst_value, dst_tail);
1102 } else if (is_null_oid(&matched_src->new_oid)) {
1103 error(_("unable to delete '%s': remote ref does not exist"),
1104 dst_value);
1105 } else if ((dst_guess = guess_ref(dst_value, matched_src))) {
1106 matched_dst = make_linked_ref(dst_guess, dst_tail);
1107 free(dst_guess);
1108 } else {
1109 show_push_unqualified_ref_name_error(dst_value,
1110 matched_src->name);
1111 }
1112 break;
1113 default:
1114 matched_dst = NULL;
1115 error(_("dst refspec %s matches more than one"),
1116 dst_value);
1117 break;
1118 }
1119 if (!matched_dst)
1120 return -1;
1121 if (matched_dst->peer_ref)
1122 return error(_("dst ref %s receives from more than one src"),
1123 matched_dst->name);
1124 else {
1125 matched_dst->peer_ref = allocated_src ?
1126 matched_src :
1127 copy_ref(matched_src);
1128 matched_dst->force = rs->force;
1129 }
1130 return 0;
1131 }
1132
1133 static int match_explicit_refs(struct ref *src, struct ref *dst,
1134 struct ref ***dst_tail, struct refspec *rs)
1135 {
1136 int i, errs;
1137 for (i = errs = 0; i < rs->nr; i++)
1138 errs += match_explicit(src, dst, dst_tail, &rs->items[i]);
1139 return errs;
1140 }
1141
1142 static char *get_ref_match(const struct refspec *rs, const struct ref *ref,
1143 int send_mirror, int direction,
1144 const struct refspec_item **ret_pat)
1145 {
1146 const struct refspec_item *pat;
1147 char *name;
1148 int i;
1149 int matching_refs = -1;
1150 for (i = 0; i < rs->nr; i++) {
1151 const struct refspec_item *item = &rs->items[i];
1152 if (item->matching &&
1153 (matching_refs == -1 || item->force)) {
1154 matching_refs = i;
1155 continue;
1156 }
1157
1158 if (item->pattern) {
1159 const char *dst_side = item->dst ? item->dst : item->src;
1160 int match;
1161 if (direction == FROM_SRC)
1162 match = match_name_with_pattern(item->src, ref->name, dst_side, &name);
1163 else
1164 match = match_name_with_pattern(dst_side, ref->name, item->src, &name);
1165 if (match) {
1166 matching_refs = i;
1167 break;
1168 }
1169 }
1170 }
1171 if (matching_refs == -1)
1172 return NULL;
1173
1174 pat = &rs->items[matching_refs];
1175 if (pat->matching) {
1176 /*
1177 * "matching refs"; traditionally we pushed everything
1178 * including refs outside refs/heads/ hierarchy, but
1179 * that does not make much sense these days.
1180 */
1181 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1182 return NULL;
1183 name = xstrdup(ref->name);
1184 }
1185 if (ret_pat)
1186 *ret_pat = pat;
1187 return name;
1188 }
1189
1190 static struct ref **tail_ref(struct ref **head)
1191 {
1192 struct ref **tail = head;
1193 while (*tail)
1194 tail = &((*tail)->next);
1195 return tail;
1196 }
1197
1198 struct tips {
1199 struct commit **tip;
1200 int nr, alloc;
1201 };
1202
1203 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1204 {
1205 struct commit *commit;
1206
1207 if (is_null_oid(oid))
1208 return;
1209 commit = lookup_commit_reference_gently(the_repository, oid, 1);
1210 if (!commit || (commit->object.flags & TMP_MARK))
1211 return;
1212 commit->object.flags |= TMP_MARK;
1213 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1214 tips->tip[tips->nr++] = commit;
1215 }
1216
1217 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1218 {
1219 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1220 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1221 struct string_list_item *item;
1222 struct ref *ref;
1223 struct tips sent_tips;
1224
1225 /*
1226 * Collect everything we know they would have at the end of
1227 * this push, and collect all tags they have.
1228 */
1229 memset(&sent_tips, 0, sizeof(sent_tips));
1230 for (ref = *dst; ref; ref = ref->next) {
1231 if (ref->peer_ref &&
1232 !is_null_oid(&ref->peer_ref->new_oid))
1233 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1234 else
1235 add_to_tips(&sent_tips, &ref->old_oid);
1236 if (starts_with(ref->name, "refs/tags/"))
1237 string_list_append(&dst_tag, ref->name);
1238 }
1239 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1240
1241 string_list_sort(&dst_tag);
1242
1243 /* Collect tags they do not have. */
1244 for (ref = src; ref; ref = ref->next) {
1245 if (!starts_with(ref->name, "refs/tags/"))
1246 continue; /* not a tag */
1247 if (string_list_has_string(&dst_tag, ref->name))
1248 continue; /* they already have it */
1249 if (oid_object_info(the_repository, &ref->new_oid, NULL) != OBJ_TAG)
1250 continue; /* be conservative */
1251 item = string_list_append(&src_tag, ref->name);
1252 item->util = ref;
1253 }
1254 string_list_clear(&dst_tag, 0);
1255
1256 /*
1257 * At this point, src_tag lists tags that are missing from
1258 * dst, and sent_tips lists the tips we are pushing or those
1259 * that we know they already have. An element in the src_tag
1260 * that is an ancestor of any of the sent_tips needs to be
1261 * sent to the other side.
1262 */
1263 if (sent_tips.nr) {
1264 const int reachable_flag = 1;
1265 struct commit_list *found_commits;
1266 struct commit **src_commits;
1267 int nr_src_commits = 0, alloc_src_commits = 16;
1268 ALLOC_ARRAY(src_commits, alloc_src_commits);
1269
1270 for_each_string_list_item(item, &src_tag) {
1271 struct ref *ref = item->util;
1272 struct commit *commit;
1273
1274 if (is_null_oid(&ref->new_oid))
1275 continue;
1276 commit = lookup_commit_reference_gently(the_repository,
1277 &ref->new_oid,
1278 1);
1279 if (!commit)
1280 /* not pushing a commit, which is not an error */
1281 continue;
1282
1283 ALLOC_GROW(src_commits, nr_src_commits + 1, alloc_src_commits);
1284 src_commits[nr_src_commits++] = commit;
1285 }
1286
1287 found_commits = get_reachable_subset(sent_tips.tip, sent_tips.nr,
1288 src_commits, nr_src_commits,
1289 reachable_flag);
1290
1291 for_each_string_list_item(item, &src_tag) {
1292 struct ref *dst_ref;
1293 struct ref *ref = item->util;
1294 struct commit *commit;
1295
1296 if (is_null_oid(&ref->new_oid))
1297 continue;
1298 commit = lookup_commit_reference_gently(the_repository,
1299 &ref->new_oid,
1300 1);
1301 if (!commit)
1302 /* not pushing a commit, which is not an error */
1303 continue;
1304
1305 /*
1306 * Is this tag, which they do not have, reachable from
1307 * any of the commits we are sending?
1308 */
1309 if (!(commit->object.flags & reachable_flag))
1310 continue;
1311
1312 /* Add it in */
1313 dst_ref = make_linked_ref(ref->name, dst_tail);
1314 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1315 dst_ref->peer_ref = copy_ref(ref);
1316 }
1317
1318 clear_commit_marks_many(nr_src_commits, src_commits, reachable_flag);
1319 free(src_commits);
1320 free_commit_list(found_commits);
1321 }
1322
1323 string_list_clear(&src_tag, 0);
1324 free(sent_tips.tip);
1325 }
1326
1327 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1328 {
1329 for ( ; list; list = list->next)
1330 if (!strcmp(list->name, name))
1331 return (struct ref *)list;
1332 return NULL;
1333 }
1334
1335 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1336 {
1337 for ( ; ref; ref = ref->next)
1338 string_list_append_nodup(ref_index, ref->name)->util = ref;
1339
1340 string_list_sort(ref_index);
1341 }
1342
1343 /*
1344 * Given only the set of local refs, sanity-check the set of push
1345 * refspecs. We can't catch all errors that match_push_refs would,
1346 * but we can catch some errors early before even talking to the
1347 * remote side.
1348 */
1349 int check_push_refs(struct ref *src, struct refspec *rs)
1350 {
1351 int ret = 0;
1352 int i;
1353
1354 for (i = 0; i < rs->nr; i++) {
1355 struct refspec_item *item = &rs->items[i];
1356
1357 if (item->pattern || item->matching)
1358 continue;
1359
1360 ret |= match_explicit_lhs(src, item, NULL, NULL);
1361 }
1362
1363 return ret;
1364 }
1365
1366 /*
1367 * Given the set of refs the local repository has, the set of refs the
1368 * remote repository has, and the refspec used for push, determine
1369 * what remote refs we will update and with what value by setting
1370 * peer_ref (which object is being pushed) and force (if the push is
1371 * forced) in elements of "dst". The function may add new elements to
1372 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1373 */
1374 int match_push_refs(struct ref *src, struct ref **dst,
1375 struct refspec *rs, int flags)
1376 {
1377 int send_all = flags & MATCH_REFS_ALL;
1378 int send_mirror = flags & MATCH_REFS_MIRROR;
1379 int send_prune = flags & MATCH_REFS_PRUNE;
1380 int errs;
1381 struct ref *ref, **dst_tail = tail_ref(dst);
1382 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1383
1384 /* If no refspec is provided, use the default ":" */
1385 if (!rs->nr)
1386 refspec_append(rs, ":");
1387
1388 errs = match_explicit_refs(src, *dst, &dst_tail, rs);
1389
1390 /* pick the remainder */
1391 for (ref = src; ref; ref = ref->next) {
1392 struct string_list_item *dst_item;
1393 struct ref *dst_peer;
1394 const struct refspec_item *pat = NULL;
1395 char *dst_name;
1396
1397 dst_name = get_ref_match(rs, ref, send_mirror, FROM_SRC, &pat);
1398 if (!dst_name)
1399 continue;
1400
1401 if (!dst_ref_index.nr)
1402 prepare_ref_index(&dst_ref_index, *dst);
1403
1404 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1405 dst_peer = dst_item ? dst_item->util : NULL;
1406 if (dst_peer) {
1407 if (dst_peer->peer_ref)
1408 /* We're already sending something to this ref. */
1409 goto free_name;
1410 } else {
1411 if (pat->matching && !(send_all || send_mirror))
1412 /*
1413 * Remote doesn't have it, and we have no
1414 * explicit pattern, and we don't have
1415 * --all or --mirror.
1416 */
1417 goto free_name;
1418
1419 /* Create a new one and link it */
1420 dst_peer = make_linked_ref(dst_name, &dst_tail);
1421 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1422 string_list_insert(&dst_ref_index,
1423 dst_peer->name)->util = dst_peer;
1424 }
1425 dst_peer->peer_ref = copy_ref(ref);
1426 dst_peer->force = pat->force;
1427 free_name:
1428 free(dst_name);
1429 }
1430
1431 string_list_clear(&dst_ref_index, 0);
1432
1433 if (flags & MATCH_REFS_FOLLOW_TAGS)
1434 add_missing_tags(src, dst, &dst_tail);
1435
1436 if (send_prune) {
1437 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1438 /* check for missing refs on the remote */
1439 for (ref = *dst; ref; ref = ref->next) {
1440 char *src_name;
1441
1442 if (ref->peer_ref)
1443 /* We're already sending something to this ref. */
1444 continue;
1445
1446 src_name = get_ref_match(rs, ref, send_mirror, FROM_DST, NULL);
1447 if (src_name) {
1448 if (!src_ref_index.nr)
1449 prepare_ref_index(&src_ref_index, src);
1450 if (!string_list_has_string(&src_ref_index,
1451 src_name))
1452 ref->peer_ref = alloc_delete_ref();
1453 free(src_name);
1454 }
1455 }
1456 string_list_clear(&src_ref_index, 0);
1457 }
1458
1459 if (errs)
1460 return -1;
1461 return 0;
1462 }
1463
1464 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1465 int force_update)
1466 {
1467 struct ref *ref;
1468
1469 for (ref = remote_refs; ref; ref = ref->next) {
1470 int force_ref_update = ref->force || force_update;
1471 int reject_reason = 0;
1472
1473 if (ref->peer_ref)
1474 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1475 else if (!send_mirror)
1476 continue;
1477
1478 ref->deletion = is_null_oid(&ref->new_oid);
1479 if (!ref->deletion &&
1480 oideq(&ref->old_oid, &ref->new_oid)) {
1481 ref->status = REF_STATUS_UPTODATE;
1482 continue;
1483 }
1484
1485 /*
1486 * If the remote ref has moved and is now different
1487 * from what we expect, reject any push.
1488 *
1489 * It also is an error if the user told us to check
1490 * with the remote-tracking branch to find the value
1491 * to expect, but we did not have such a tracking
1492 * branch.
1493 */
1494 if (ref->expect_old_sha1) {
1495 if (!oideq(&ref->old_oid, &ref->old_oid_expect))
1496 reject_reason = REF_STATUS_REJECT_STALE;
1497 else
1498 /* If the ref isn't stale then force the update. */
1499 force_ref_update = 1;
1500 }
1501
1502 /*
1503 * If the update isn't already rejected then check
1504 * the usual "must fast-forward" rules.
1505 *
1506 * Decide whether an individual refspec A:B can be
1507 * pushed. The push will succeed if any of the
1508 * following are true:
1509 *
1510 * (1) the remote reference B does not exist
1511 *
1512 * (2) the remote reference B is being removed (i.e.,
1513 * pushing :B where no source is specified)
1514 *
1515 * (3) the destination is not under refs/tags/, and
1516 * if the old and new value is a commit, the new
1517 * is a descendant of the old.
1518 *
1519 * (4) it is forced using the +A:B notation, or by
1520 * passing the --force argument
1521 */
1522
1523 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1524 if (starts_with(ref->name, "refs/tags/"))
1525 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1526 else if (!has_object_file(&ref->old_oid))
1527 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1528 else if (!lookup_commit_reference_gently(the_repository, &ref->old_oid, 1) ||
1529 !lookup_commit_reference_gently(the_repository, &ref->new_oid, 1))
1530 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1531 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1532 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1533 }
1534
1535 /*
1536 * "--force" will defeat any rejection implemented
1537 * by the rules above.
1538 */
1539 if (!force_ref_update)
1540 ref->status = reject_reason;
1541 else if (reject_reason)
1542 ref->forced_update = 1;
1543 }
1544 }
1545
1546 static void set_merge(struct branch *ret)
1547 {
1548 struct remote *remote;
1549 char *ref;
1550 struct object_id oid;
1551 int i;
1552
1553 if (!ret)
1554 return; /* no branch */
1555 if (ret->merge)
1556 return; /* already run */
1557 if (!ret->remote_name || !ret->merge_nr) {
1558 /*
1559 * no merge config; let's make sure we don't confuse callers
1560 * with a non-zero merge_nr but a NULL merge
1561 */
1562 ret->merge_nr = 0;
1563 return;
1564 }
1565
1566 remote = remote_get(ret->remote_name);
1567
1568 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1569 for (i = 0; i < ret->merge_nr; i++) {
1570 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1571 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1572 if (!remote_find_tracking(remote, ret->merge[i]) ||
1573 strcmp(ret->remote_name, "."))
1574 continue;
1575 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1576 &oid, &ref) == 1)
1577 ret->merge[i]->dst = ref;
1578 else
1579 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1580 }
1581 }
1582
1583 struct branch *branch_get(const char *name)
1584 {
1585 struct branch *ret;
1586
1587 read_config();
1588 if (!name || !*name || !strcmp(name, "HEAD"))
1589 ret = current_branch;
1590 else
1591 ret = make_branch(name, 0);
1592 set_merge(ret);
1593 return ret;
1594 }
1595
1596 int branch_has_merge_config(struct branch *branch)
1597 {
1598 return branch && !!branch->merge;
1599 }
1600
1601 int branch_merge_matches(struct branch *branch,
1602 int i,
1603 const char *refname)
1604 {
1605 if (!branch || i < 0 || i >= branch->merge_nr)
1606 return 0;
1607 return refname_match(branch->merge[i]->src, refname);
1608 }
1609
1610 __attribute__((format (printf,2,3)))
1611 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1612 {
1613 if (err) {
1614 va_list ap;
1615 va_start(ap, fmt);
1616 strbuf_vaddf(err, fmt, ap);
1617 va_end(ap);
1618 }
1619 return NULL;
1620 }
1621
1622 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1623 {
1624 if (!branch)
1625 return error_buf(err, _("HEAD does not point to a branch"));
1626
1627 if (!branch->merge || !branch->merge[0]) {
1628 /*
1629 * no merge config; is it because the user didn't define any,
1630 * or because it is not a real branch, and get_branch
1631 * auto-vivified it?
1632 */
1633 if (!ref_exists(branch->refname))
1634 return error_buf(err, _("no such branch: '%s'"),
1635 branch->name);
1636 return error_buf(err,
1637 _("no upstream configured for branch '%s'"),
1638 branch->name);
1639 }
1640
1641 if (!branch->merge[0]->dst)
1642 return error_buf(err,
1643 _("upstream branch '%s' not stored as a remote-tracking branch"),
1644 branch->merge[0]->src);
1645
1646 return branch->merge[0]->dst;
1647 }
1648
1649 static const char *tracking_for_push_dest(struct remote *remote,
1650 const char *refname,
1651 struct strbuf *err)
1652 {
1653 char *ret;
1654
1655 ret = apply_refspecs(&remote->fetch, refname);
1656 if (!ret)
1657 return error_buf(err,
1658 _("push destination '%s' on remote '%s' has no local tracking branch"),
1659 refname, remote->name);
1660 return ret;
1661 }
1662
1663 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1664 {
1665 struct remote *remote;
1666
1667 remote = remote_get(pushremote_for_branch(branch, NULL));
1668 if (!remote)
1669 return error_buf(err,
1670 _("branch '%s' has no remote for pushing"),
1671 branch->name);
1672
1673 if (remote->push.nr) {
1674 char *dst;
1675 const char *ret;
1676
1677 dst = apply_refspecs(&remote->push, branch->refname);
1678 if (!dst)
1679 return error_buf(err,
1680 _("push refspecs for '%s' do not include '%s'"),
1681 remote->name, branch->name);
1682
1683 ret = tracking_for_push_dest(remote, dst, err);
1684 free(dst);
1685 return ret;
1686 }
1687
1688 if (remote->mirror)
1689 return tracking_for_push_dest(remote, branch->refname, err);
1690
1691 switch (push_default) {
1692 case PUSH_DEFAULT_NOTHING:
1693 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1694
1695 case PUSH_DEFAULT_MATCHING:
1696 case PUSH_DEFAULT_CURRENT:
1697 return tracking_for_push_dest(remote, branch->refname, err);
1698
1699 case PUSH_DEFAULT_UPSTREAM:
1700 return branch_get_upstream(branch, err);
1701
1702 case PUSH_DEFAULT_UNSPECIFIED:
1703 case PUSH_DEFAULT_SIMPLE:
1704 {
1705 const char *up, *cur;
1706
1707 up = branch_get_upstream(branch, err);
1708 if (!up)
1709 return NULL;
1710 cur = tracking_for_push_dest(remote, branch->refname, err);
1711 if (!cur)
1712 return NULL;
1713 if (strcmp(cur, up))
1714 return error_buf(err,
1715 _("cannot resolve 'simple' push to a single destination"));
1716 return cur;
1717 }
1718 }
1719
1720 BUG("unhandled push situation");
1721 }
1722
1723 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1724 {
1725 if (!branch)
1726 return error_buf(err, _("HEAD does not point to a branch"));
1727
1728 if (!branch->push_tracking_ref)
1729 branch->push_tracking_ref = branch_get_push_1(branch, err);
1730 return branch->push_tracking_ref;
1731 }
1732
1733 static int ignore_symref_update(const char *refname)
1734 {
1735 int flag;
1736
1737 if (!resolve_ref_unsafe(refname, 0, NULL, &flag))
1738 return 0; /* non-existing refs are OK */
1739 return (flag & REF_ISSYMREF);
1740 }
1741
1742 /*
1743 * Create and return a list of (struct ref) consisting of copies of
1744 * each remote_ref that matches refspec. refspec must be a pattern.
1745 * Fill in the copies' peer_ref to describe the local tracking refs to
1746 * which they map. Omit any references that would map to an existing
1747 * local symbolic ref.
1748 */
1749 static struct ref *get_expanded_map(const struct ref *remote_refs,
1750 const struct refspec_item *refspec)
1751 {
1752 const struct ref *ref;
1753 struct ref *ret = NULL;
1754 struct ref **tail = &ret;
1755
1756 for (ref = remote_refs; ref; ref = ref->next) {
1757 char *expn_name = NULL;
1758
1759 if (strchr(ref->name, '^'))
1760 continue; /* a dereference item */
1761 if (match_name_with_pattern(refspec->src, ref->name,
1762 refspec->dst, &expn_name) &&
1763 !ignore_symref_update(expn_name)) {
1764 struct ref *cpy = copy_ref(ref);
1765
1766 cpy->peer_ref = alloc_ref(expn_name);
1767 if (refspec->force)
1768 cpy->peer_ref->force = 1;
1769 *tail = cpy;
1770 tail = &cpy->next;
1771 }
1772 free(expn_name);
1773 }
1774
1775 return ret;
1776 }
1777
1778 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1779 {
1780 const struct ref *ref;
1781 const struct ref *best_match = NULL;
1782 int best_score = 0;
1783
1784 for (ref = refs; ref; ref = ref->next) {
1785 int score = refname_match(name, ref->name);
1786
1787 if (best_score < score) {
1788 best_match = ref;
1789 best_score = score;
1790 }
1791 }
1792 return best_match;
1793 }
1794
1795 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1796 {
1797 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1798
1799 if (!ref)
1800 return NULL;
1801
1802 return copy_ref(ref);
1803 }
1804
1805 static struct ref *get_local_ref(const char *name)
1806 {
1807 if (!name || name[0] == '\0')
1808 return NULL;
1809
1810 if (starts_with(name, "refs/"))
1811 return alloc_ref(name);
1812
1813 if (starts_with(name, "heads/") ||
1814 starts_with(name, "tags/") ||
1815 starts_with(name, "remotes/"))
1816 return alloc_ref_with_prefix("refs/", 5, name);
1817
1818 return alloc_ref_with_prefix("refs/heads/", 11, name);
1819 }
1820
1821 int get_fetch_map(const struct ref *remote_refs,
1822 const struct refspec_item *refspec,
1823 struct ref ***tail,
1824 int missing_ok)
1825 {
1826 struct ref *ref_map, **rmp;
1827
1828 if (refspec->pattern) {
1829 ref_map = get_expanded_map(remote_refs, refspec);
1830 } else {
1831 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1832
1833 if (refspec->exact_sha1) {
1834 ref_map = alloc_ref(name);
1835 get_oid_hex(name, &ref_map->old_oid);
1836 ref_map->exact_oid = 1;
1837 } else {
1838 ref_map = get_remote_ref(remote_refs, name);
1839 }
1840 if (!missing_ok && !ref_map)
1841 die(_("couldn't find remote ref %s"), name);
1842 if (ref_map) {
1843 ref_map->peer_ref = get_local_ref(refspec->dst);
1844 if (ref_map->peer_ref && refspec->force)
1845 ref_map->peer_ref->force = 1;
1846 }
1847 }
1848
1849 for (rmp = &ref_map; *rmp; ) {
1850 if ((*rmp)->peer_ref) {
1851 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1852 check_refname_format((*rmp)->peer_ref->name, 0)) {
1853 struct ref *ignore = *rmp;
1854 error(_("* Ignoring funny ref '%s' locally"),
1855 (*rmp)->peer_ref->name);
1856 *rmp = (*rmp)->next;
1857 free(ignore->peer_ref);
1858 free(ignore);
1859 continue;
1860 }
1861 }
1862 rmp = &((*rmp)->next);
1863 }
1864
1865 if (ref_map)
1866 tail_link_ref(ref_map, tail);
1867
1868 return 0;
1869 }
1870
1871 int resolve_remote_symref(struct ref *ref, struct ref *list)
1872 {
1873 if (!ref->symref)
1874 return 0;
1875 for (; list; list = list->next)
1876 if (!strcmp(ref->symref, list->name)) {
1877 oidcpy(&ref->old_oid, &list->old_oid);
1878 return 0;
1879 }
1880 return 1;
1881 }
1882
1883 /*
1884 * Compute the commit ahead/behind values for the pair branch_name, base.
1885 *
1886 * If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
1887 * counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
1888 * the (potentially expensive) a/b computation (*num_ours and *num_theirs are
1889 * set to zero).
1890 *
1891 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., ref
1892 * does not exist). Returns 0 if the commits are identical. Returns 1 if
1893 * commits are different.
1894 */
1895
1896 static int stat_branch_pair(const char *branch_name, const char *base,
1897 int *num_ours, int *num_theirs,
1898 enum ahead_behind_flags abf)
1899 {
1900 struct object_id oid;
1901 struct commit *ours, *theirs;
1902 struct rev_info revs;
1903 struct argv_array argv = ARGV_ARRAY_INIT;
1904
1905 /* Cannot stat if what we used to build on no longer exists */
1906 if (read_ref(base, &oid))
1907 return -1;
1908 theirs = lookup_commit_reference(the_repository, &oid);
1909 if (!theirs)
1910 return -1;
1911
1912 if (read_ref(branch_name, &oid))
1913 return -1;
1914 ours = lookup_commit_reference(the_repository, &oid);
1915 if (!ours)
1916 return -1;
1917
1918 *num_theirs = *num_ours = 0;
1919
1920 /* are we the same? */
1921 if (theirs == ours)
1922 return 0;
1923 if (abf == AHEAD_BEHIND_QUICK)
1924 return 1;
1925 if (abf != AHEAD_BEHIND_FULL)
1926 BUG("stat_branch_pair: invalid abf '%d'", abf);
1927
1928 /* Run "rev-list --left-right ours...theirs" internally... */
1929 argv_array_push(&argv, ""); /* ignored */
1930 argv_array_push(&argv, "--left-right");
1931 argv_array_pushf(&argv, "%s...%s",
1932 oid_to_hex(&ours->object.oid),
1933 oid_to_hex(&theirs->object.oid));
1934 argv_array_push(&argv, "--");
1935
1936 repo_init_revisions(the_repository, &revs, NULL);
1937 setup_revisions(argv.argc, argv.argv, &revs, NULL);
1938 if (prepare_revision_walk(&revs))
1939 die(_("revision walk setup failed"));
1940
1941 /* ... and count the commits on each side. */
1942 while (1) {
1943 struct commit *c = get_revision(&revs);
1944 if (!c)
1945 break;
1946 if (c->object.flags & SYMMETRIC_LEFT)
1947 (*num_ours)++;
1948 else
1949 (*num_theirs)++;
1950 }
1951
1952 /* clear object flags smudged by the above traversal */
1953 clear_commit_marks(ours, ALL_REV_FLAGS);
1954 clear_commit_marks(theirs, ALL_REV_FLAGS);
1955
1956 argv_array_clear(&argv);
1957 return 1;
1958 }
1959
1960 /*
1961 * Lookup the tracking branch for the given branch and if present, optionally
1962 * compute the commit ahead/behind values for the pair.
1963 *
1964 * If for_push is true, the tracking branch refers to the push branch,
1965 * otherwise it refers to the upstream branch.
1966 *
1967 * The name of the tracking branch (or NULL if it is not defined) is
1968 * returned via *tracking_name, if it is not itself NULL.
1969 *
1970 * If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
1971 * counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
1972 * the (potentially expensive) a/b computation (*num_ours and *num_theirs are
1973 * set to zero).
1974 *
1975 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1976 * upstream defined, or ref does not exist). Returns 0 if the commits are
1977 * identical. Returns 1 if commits are different.
1978 */
1979 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1980 const char **tracking_name, int for_push,
1981 enum ahead_behind_flags abf)
1982 {
1983 const char *base;
1984
1985 /* Cannot stat unless we are marked to build on top of somebody else. */
1986 base = for_push ? branch_get_push(branch, NULL) :
1987 branch_get_upstream(branch, NULL);
1988 if (tracking_name)
1989 *tracking_name = base;
1990 if (!base)
1991 return -1;
1992
1993 return stat_branch_pair(branch->refname, base, num_ours, num_theirs, abf);
1994 }
1995
1996 /*
1997 * Return true when there is anything to report, otherwise false.
1998 */
1999 int format_tracking_info(struct branch *branch, struct strbuf *sb,
2000 enum ahead_behind_flags abf)
2001 {
2002 int ours, theirs, sti;
2003 const char *full_base;
2004 char *base;
2005 int upstream_is_gone = 0;
2006
2007 sti = stat_tracking_info(branch, &ours, &theirs, &full_base, 0, abf);
2008 if (sti < 0) {
2009 if (!full_base)
2010 return 0;
2011 upstream_is_gone = 1;
2012 }
2013
2014 base = shorten_unambiguous_ref(full_base, 0);
2015 if (upstream_is_gone) {
2016 strbuf_addf(sb,
2017 _("Your branch is based on '%s', but the upstream is gone.\n"),
2018 base);
2019 if (advice_status_hints)
2020 strbuf_addstr(sb,
2021 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2022 } else if (!sti) {
2023 strbuf_addf(sb,
2024 _("Your branch is up to date with '%s'.\n"),
2025 base);
2026 } else if (abf == AHEAD_BEHIND_QUICK) {
2027 strbuf_addf(sb,
2028 _("Your branch and '%s' refer to different commits.\n"),
2029 base);
2030 if (advice_status_hints)
2031 strbuf_addf(sb, _(" (use \"%s\" for details)\n"),
2032 "git status --ahead-behind");
2033 } else if (!theirs) {
2034 strbuf_addf(sb,
2035 Q_("Your branch is ahead of '%s' by %d commit.\n",
2036 "Your branch is ahead of '%s' by %d commits.\n",
2037 ours),
2038 base, ours);
2039 if (advice_status_hints)
2040 strbuf_addstr(sb,
2041 _(" (use \"git push\" to publish your local commits)\n"));
2042 } else if (!ours) {
2043 strbuf_addf(sb,
2044 Q_("Your branch is behind '%s' by %d commit, "
2045 "and can be fast-forwarded.\n",
2046 "Your branch is behind '%s' by %d commits, "
2047 "and can be fast-forwarded.\n",
2048 theirs),
2049 base, theirs);
2050 if (advice_status_hints)
2051 strbuf_addstr(sb,
2052 _(" (use \"git pull\" to update your local branch)\n"));
2053 } else {
2054 strbuf_addf(sb,
2055 Q_("Your branch and '%s' have diverged,\n"
2056 "and have %d and %d different commit each, "
2057 "respectively.\n",
2058 "Your branch and '%s' have diverged,\n"
2059 "and have %d and %d different commits each, "
2060 "respectively.\n",
2061 ours + theirs),
2062 base, ours, theirs);
2063 if (advice_status_hints)
2064 strbuf_addstr(sb,
2065 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2066 }
2067 free(base);
2068 return 1;
2069 }
2070
2071 static int one_local_ref(const char *refname, const struct object_id *oid,
2072 int flag, void *cb_data)
2073 {
2074 struct ref ***local_tail = cb_data;
2075 struct ref *ref;
2076
2077 /* we already know it starts with refs/ to get here */
2078 if (check_refname_format(refname + 5, 0))
2079 return 0;
2080
2081 ref = alloc_ref(refname);
2082 oidcpy(&ref->new_oid, oid);
2083 **local_tail = ref;
2084 *local_tail = &ref->next;
2085 return 0;
2086 }
2087
2088 struct ref *get_local_heads(void)
2089 {
2090 struct ref *local_refs = NULL, **local_tail = &local_refs;
2091
2092 for_each_ref(one_local_ref, &local_tail);
2093 return local_refs;
2094 }
2095
2096 struct ref *guess_remote_head(const struct ref *head,
2097 const struct ref *refs,
2098 int all)
2099 {
2100 const struct ref *r;
2101 struct ref *list = NULL;
2102 struct ref **tail = &list;
2103
2104 if (!head)
2105 return NULL;
2106
2107 /*
2108 * Some transports support directly peeking at
2109 * where HEAD points; if that is the case, then
2110 * we don't have to guess.
2111 */
2112 if (head->symref)
2113 return copy_ref(find_ref_by_name(refs, head->symref));
2114
2115 /* If refs/heads/master could be right, it is. */
2116 if (!all) {
2117 r = find_ref_by_name(refs, "refs/heads/master");
2118 if (r && oideq(&r->old_oid, &head->old_oid))
2119 return copy_ref(r);
2120 }
2121
2122 /* Look for another ref that points there */
2123 for (r = refs; r; r = r->next) {
2124 if (r != head &&
2125 starts_with(r->name, "refs/heads/") &&
2126 oideq(&r->old_oid, &head->old_oid)) {
2127 *tail = copy_ref(r);
2128 tail = &((*tail)->next);
2129 if (!all)
2130 break;
2131 }
2132 }
2133
2134 return list;
2135 }
2136
2137 struct stale_heads_info {
2138 struct string_list *ref_names;
2139 struct ref **stale_refs_tail;
2140 struct refspec *rs;
2141 };
2142
2143 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2144 int flags, void *cb_data)
2145 {
2146 struct stale_heads_info *info = cb_data;
2147 struct string_list matches = STRING_LIST_INIT_DUP;
2148 struct refspec_item query;
2149 int i, stale = 1;
2150 memset(&query, 0, sizeof(struct refspec_item));
2151 query.dst = (char *)refname;
2152
2153 query_refspecs_multiple(info->rs, &query, &matches);
2154 if (matches.nr == 0)
2155 goto clean_exit; /* No matches */
2156
2157 /*
2158 * If we did find a suitable refspec and it's not a symref and
2159 * it's not in the list of refs that currently exist in that
2160 * remote, we consider it to be stale. In order to deal with
2161 * overlapping refspecs, we need to go over all of the
2162 * matching refs.
2163 */
2164 if (flags & REF_ISSYMREF)
2165 goto clean_exit;
2166
2167 for (i = 0; stale && i < matches.nr; i++)
2168 if (string_list_has_string(info->ref_names, matches.items[i].string))
2169 stale = 0;
2170
2171 if (stale) {
2172 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2173 oidcpy(&ref->new_oid, oid);
2174 }
2175
2176 clean_exit:
2177 string_list_clear(&matches, 0);
2178 return 0;
2179 }
2180
2181 struct ref *get_stale_heads(struct refspec *rs, struct ref *fetch_map)
2182 {
2183 struct ref *ref, *stale_refs = NULL;
2184 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2185 struct stale_heads_info info;
2186
2187 info.ref_names = &ref_names;
2188 info.stale_refs_tail = &stale_refs;
2189 info.rs = rs;
2190 for (ref = fetch_map; ref; ref = ref->next)
2191 string_list_append(&ref_names, ref->name);
2192 string_list_sort(&ref_names);
2193 for_each_ref(get_stale_heads_cb, &info);
2194 string_list_clear(&ref_names, 0);
2195 return stale_refs;
2196 }
2197
2198 /*
2199 * Compare-and-swap
2200 */
2201 static void clear_cas_option(struct push_cas_option *cas)
2202 {
2203 int i;
2204
2205 for (i = 0; i < cas->nr; i++)
2206 free(cas->entry[i].refname);
2207 free(cas->entry);
2208 memset(cas, 0, sizeof(*cas));
2209 }
2210
2211 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2212 const char *refname,
2213 size_t refnamelen)
2214 {
2215 struct push_cas *entry;
2216 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2217 entry = &cas->entry[cas->nr++];
2218 memset(entry, 0, sizeof(*entry));
2219 entry->refname = xmemdupz(refname, refnamelen);
2220 return entry;
2221 }
2222
2223 static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2224 {
2225 const char *colon;
2226 struct push_cas *entry;
2227
2228 if (unset) {
2229 /* "--no-<option>" */
2230 clear_cas_option(cas);
2231 return 0;
2232 }
2233
2234 if (!arg) {
2235 /* just "--<option>" */
2236 cas->use_tracking_for_rest = 1;
2237 return 0;
2238 }
2239
2240 /* "--<option>=refname" or "--<option>=refname:value" */
2241 colon = strchrnul(arg, ':');
2242 entry = add_cas_entry(cas, arg, colon - arg);
2243 if (!*colon)
2244 entry->use_tracking = 1;
2245 else if (!colon[1])
2246 oidclr(&entry->expect);
2247 else if (get_oid(colon + 1, &entry->expect))
2248 return error(_("cannot parse expected object name '%s'"),
2249 colon + 1);
2250 return 0;
2251 }
2252
2253 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2254 {
2255 return parse_push_cas_option(opt->value, arg, unset);
2256 }
2257
2258 int is_empty_cas(const struct push_cas_option *cas)
2259 {
2260 return !cas->use_tracking_for_rest && !cas->nr;
2261 }
2262
2263 /*
2264 * Look at remote.fetch refspec and see if we have a remote
2265 * tracking branch for the refname there. Fill its current
2266 * value in sha1[].
2267 * If we cannot do so, return negative to signal an error.
2268 */
2269 static int remote_tracking(struct remote *remote, const char *refname,
2270 struct object_id *oid)
2271 {
2272 char *dst;
2273
2274 dst = apply_refspecs(&remote->fetch, refname);
2275 if (!dst)
2276 return -1; /* no tracking ref for refname at remote */
2277 if (read_ref(dst, oid))
2278 return -1; /* we know what the tracking ref is but we cannot read it */
2279 return 0;
2280 }
2281
2282 static void apply_cas(struct push_cas_option *cas,
2283 struct remote *remote,
2284 struct ref *ref)
2285 {
2286 int i;
2287
2288 /* Find an explicit --<option>=<name>[:<value>] entry */
2289 for (i = 0; i < cas->nr; i++) {
2290 struct push_cas *entry = &cas->entry[i];
2291 if (!refname_match(entry->refname, ref->name))
2292 continue;
2293 ref->expect_old_sha1 = 1;
2294 if (!entry->use_tracking)
2295 oidcpy(&ref->old_oid_expect, &entry->expect);
2296 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2297 oidclr(&ref->old_oid_expect);
2298 return;
2299 }
2300
2301 /* Are we using "--<option>" to cover all? */
2302 if (!cas->use_tracking_for_rest)
2303 return;
2304
2305 ref->expect_old_sha1 = 1;
2306 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2307 oidclr(&ref->old_oid_expect);
2308 }
2309
2310 void apply_push_cas(struct push_cas_option *cas,
2311 struct remote *remote,
2312 struct ref *remote_refs)
2313 {
2314 struct ref *ref;
2315 for (ref = remote_refs; ref; ref = ref->next)
2316 apply_cas(cas, remote, ref);
2317 }
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