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send-pack: mark failure of atomic push properly
[alt-git.git] / remote.c
blobc43196ec06c50beb1b7c93e180a62c031d67c10e
1 #include "cache.h"
2 #include "config.h"
3 #include "remote.h"
4 #include "refs.h"
5 #include "refspec.h"
6 #include "object-store.h"
7 #include "commit.h"
8 #include "diff.h"
9 #include "revision.h"
10 #include "dir.h"
11 #include "tag.h"
12 #include "string-list.h"
13 #include "mergesort.h"
14 #include "argv-array.h"
15 #include "commit-reach.h"
16 #include "advice.h"
17
18 enum map_direction { FROM_SRC, FROM_DST };
19
20 struct counted_string {
21 size_t len;
22 const char *s;
23 };
24 struct rewrite {
25 const char *base;
26 size_t baselen;
27 struct counted_string *instead_of;
28 int instead_of_nr;
29 int instead_of_alloc;
30 };
31 struct rewrites {
32 struct rewrite **rewrite;
33 int rewrite_alloc;
34 int rewrite_nr;
35 };
36
37 static struct remote **remotes;
38 static int remotes_alloc;
39 static int remotes_nr;
40 static struct hashmap remotes_hash;
41
42 static struct branch **branches;
43 static int branches_alloc;
44 static int branches_nr;
45
46 static struct branch *current_branch;
47 static const char *pushremote_name;
48
49 static struct rewrites rewrites;
50 static struct rewrites rewrites_push;
51
52 static int valid_remote(const struct remote *remote)
53 {
54 return (!!remote->url) || (!!remote->foreign_vcs);
55 }
56
57 static const char *alias_url(const char *url, struct rewrites *r)
58 {
59 int i, j;
60 struct counted_string *longest;
61 int longest_i;
62
63 longest = NULL;
64 longest_i = -1;
65 for (i = 0; i < r->rewrite_nr; i++) {
66 if (!r->rewrite[i])
67 continue;
68 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
69 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
70 (!longest ||
71 longest->len < r->rewrite[i]->instead_of[j].len)) {
72 longest = &(r->rewrite[i]->instead_of[j]);
73 longest_i = i;
74 }
75 }
76 }
77 if (!longest)
78 return url;
79
80 return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
81 }
82
83 static void add_url(struct remote *remote, const char *url)
84 {
85 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
86 remote->url[remote->url_nr++] = url;
87 }
88
89 static void add_pushurl(struct remote *remote, const char *pushurl)
90 {
91 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
92 remote->pushurl[remote->pushurl_nr++] = pushurl;
93 }
94
95 static void add_pushurl_alias(struct remote *remote, const char *url)
96 {
97 const char *pushurl = alias_url(url, &rewrites_push);
98 if (pushurl != url)
99 add_pushurl(remote, pushurl);
100 }
101
102 static void add_url_alias(struct remote *remote, const char *url)
103 {
104 add_url(remote, alias_url(url, &rewrites));
105 add_pushurl_alias(remote, url);
106 }
107
108 struct remotes_hash_key {
109 const char *str;
110 int len;
111 };
112
113 static int remotes_hash_cmp(const void *unused_cmp_data,
114 const struct hashmap_entry *eptr,
115 const struct hashmap_entry *entry_or_key,
116 const void *keydata)
117 {
118 const struct remote *a, *b;
119 const struct remotes_hash_key *key = keydata;
120
121 a = container_of(eptr, const struct remote, ent);
122 b = container_of(entry_or_key, const struct remote, ent);
123
124 if (key)
125 return strncmp(a->name, key->str, key->len) || a->name[key->len];
126 else
127 return strcmp(a->name, b->name);
128 }
129
130 static inline void init_remotes_hash(void)
131 {
132 if (!remotes_hash.cmpfn)
133 hashmap_init(&remotes_hash, remotes_hash_cmp, NULL, 0);
134 }
135
136 static struct remote *make_remote(const char *name, int len)
137 {
138 struct remote *ret, *replaced;
139 struct remotes_hash_key lookup;
140 struct hashmap_entry lookup_entry, *e;
141
142 if (!len)
143 len = strlen(name);
144
145 init_remotes_hash();
146 lookup.str = name;
147 lookup.len = len;
148 hashmap_entry_init(&lookup_entry, memhash(name, len));
149
150 e = hashmap_get(&remotes_hash, &lookup_entry, &lookup);
151 if (e)
152 return container_of(e, struct remote, ent);
153
154 ret = xcalloc(1, sizeof(struct remote));
155 ret->prune = -1; /* unspecified */
156 ret->prune_tags = -1; /* unspecified */
157 ret->name = xstrndup(name, len);
158 refspec_init(&ret->push, REFSPEC_PUSH);
159 refspec_init(&ret->fetch, REFSPEC_FETCH);
160
161 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
162 remotes[remotes_nr++] = ret;
163
164 hashmap_entry_init(&ret->ent, lookup_entry.hash);
165 replaced = hashmap_put_entry(&remotes_hash, ret, ent);
166 assert(replaced == NULL); /* no previous entry overwritten */
167 return ret;
168 }
169
170 static void add_merge(struct branch *branch, const char *name)
171 {
172 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
173 branch->merge_alloc);
174 branch->merge_name[branch->merge_nr++] = name;
175 }
176
177 static struct branch *make_branch(const char *name, int len)
178 {
179 struct branch *ret;
180 int i;
181
182 for (i = 0; i < branches_nr; i++) {
183 if (len ? (!strncmp(name, branches[i]->name, len) &&
184 !branches[i]->name[len]) :
185 !strcmp(name, branches[i]->name))
186 return branches[i];
187 }
188
189 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
190 ret = xcalloc(1, sizeof(struct branch));
191 branches[branches_nr++] = ret;
192 if (len)
193 ret->name = xstrndup(name, len);
194 else
195 ret->name = xstrdup(name);
196 ret->refname = xstrfmt("refs/heads/%s", ret->name);
197
198 return ret;
199 }
200
201 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
202 {
203 struct rewrite *ret;
204 int i;
205
206 for (i = 0; i < r->rewrite_nr; i++) {
207 if (len
208 ? (len == r->rewrite[i]->baselen &&
209 !strncmp(base, r->rewrite[i]->base, len))
210 : !strcmp(base, r->rewrite[i]->base))
211 return r->rewrite[i];
212 }
213
214 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
215 ret = xcalloc(1, sizeof(struct rewrite));
216 r->rewrite[r->rewrite_nr++] = ret;
217 if (len) {
218 ret->base = xstrndup(base, len);
219 ret->baselen = len;
220 }
221 else {
222 ret->base = xstrdup(base);
223 ret->baselen = strlen(base);
224 }
225 return ret;
226 }
227
228 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
229 {
230 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
231 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
232 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
233 rewrite->instead_of_nr++;
234 }
235
236 static const char *skip_spaces(const char *s)
237 {
238 while (isspace(*s))
239 s++;
240 return s;
241 }
242
243 static void read_remotes_file(struct remote *remote)
244 {
245 struct strbuf buf = STRBUF_INIT;
246 FILE *f = fopen_or_warn(git_path("remotes/%s", remote->name), "r");
247
248 if (!f)
249 return;
250 remote->configured_in_repo = 1;
251 remote->origin = REMOTE_REMOTES;
252 while (strbuf_getline(&buf, f) != EOF) {
253 const char *v;
254
255 strbuf_rtrim(&buf);
256
257 if (skip_prefix(buf.buf, "URL:", &v))
258 add_url_alias(remote, xstrdup(skip_spaces(v)));
259 else if (skip_prefix(buf.buf, "Push:", &v))
260 refspec_append(&remote->push, skip_spaces(v));
261 else if (skip_prefix(buf.buf, "Pull:", &v))
262 refspec_append(&remote->fetch, skip_spaces(v));
263 }
264 strbuf_release(&buf);
265 fclose(f);
266 }
267
268 static void read_branches_file(struct remote *remote)
269 {
270 char *frag;
271 struct strbuf buf = STRBUF_INIT;
272 FILE *f = fopen_or_warn(git_path("branches/%s", remote->name), "r");
273
274 if (!f)
275 return;
276
277 strbuf_getline_lf(&buf, f);
278 fclose(f);
279 strbuf_trim(&buf);
280 if (!buf.len) {
281 strbuf_release(&buf);
282 return;
283 }
284
285 remote->configured_in_repo = 1;
286 remote->origin = REMOTE_BRANCHES;
287
288 /*
289 * The branches file would have URL and optionally
290 * #branch specified. The "master" (or specified) branch is
291 * fetched and stored in the local branch matching the
292 * remote name.
293 */
294 frag = strchr(buf.buf, '#');
295 if (frag)
296 *(frag++) = '\0';
297 else
298 frag = "master";
299
300 add_url_alias(remote, strbuf_detach(&buf, NULL));
301 strbuf_addf(&buf, "refs/heads/%s:refs/heads/%s",
302 frag, remote->name);
303 refspec_append(&remote->fetch, buf.buf);
304
305 /*
306 * Cogito compatible push: push current HEAD to remote #branch
307 * (master if missing)
308 */
309 strbuf_reset(&buf);
310 strbuf_addf(&buf, "HEAD:refs/heads/%s", frag);
311 refspec_append(&remote->push, buf.buf);
312 remote->fetch_tags = 1; /* always auto-follow */
313 strbuf_release(&buf);
314 }
315
316 static int handle_config(const char *key, const char *value, void *cb)
317 {
318 const char *name;
319 int namelen;
320 const char *subkey;
321 struct remote *remote;
322 struct branch *branch;
323 if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
324 if (!name)
325 return 0;
326 branch = make_branch(name, namelen);
327 if (!strcmp(subkey, "remote")) {
328 return git_config_string(&branch->remote_name, key, value);
329 } else if (!strcmp(subkey, "pushremote")) {
330 return git_config_string(&branch->pushremote_name, key, value);
331 } else if (!strcmp(subkey, "merge")) {
332 if (!value)
333 return config_error_nonbool(key);
334 add_merge(branch, xstrdup(value));
335 }
336 return 0;
337 }
338 if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
339 struct rewrite *rewrite;
340 if (!name)
341 return 0;
342 if (!strcmp(subkey, "insteadof")) {
343 if (!value)
344 return config_error_nonbool(key);
345 rewrite = make_rewrite(&rewrites, name, namelen);
346 add_instead_of(rewrite, xstrdup(value));
347 } else if (!strcmp(subkey, "pushinsteadof")) {
348 if (!value)
349 return config_error_nonbool(key);
350 rewrite = make_rewrite(&rewrites_push, name, namelen);
351 add_instead_of(rewrite, xstrdup(value));
352 }
353 }
354
355 if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
356 return 0;
357
358 /* Handle remote.* variables */
359 if (!name && !strcmp(subkey, "pushdefault"))
360 return git_config_string(&pushremote_name, key, value);
361
362 if (!name)
363 return 0;
364 /* Handle remote.<name>.* variables */
365 if (*name == '/') {
366 warning(_("config remote shorthand cannot begin with '/': %s"),
367 name);
368 return 0;
369 }
370 remote = make_remote(name, namelen);
371 remote->origin = REMOTE_CONFIG;
372 if (current_config_scope() == CONFIG_SCOPE_LOCAL ||
373 current_config_scope() == CONFIG_SCOPE_WORKTREE)
374 remote->configured_in_repo = 1;
375 if (!strcmp(subkey, "mirror"))
376 remote->mirror = git_config_bool(key, value);
377 else if (!strcmp(subkey, "skipdefaultupdate"))
378 remote->skip_default_update = git_config_bool(key, value);
379 else if (!strcmp(subkey, "skipfetchall"))
380 remote->skip_default_update = git_config_bool(key, value);
381 else if (!strcmp(subkey, "prune"))
382 remote->prune = git_config_bool(key, value);
383 else if (!strcmp(subkey, "prunetags"))
384 remote->prune_tags = git_config_bool(key, value);
385 else if (!strcmp(subkey, "url")) {
386 const char *v;
387 if (git_config_string(&v, key, value))
388 return -1;
389 add_url(remote, v);
390 } else if (!strcmp(subkey, "pushurl")) {
391 const char *v;
392 if (git_config_string(&v, key, value))
393 return -1;
394 add_pushurl(remote, v);
395 } else if (!strcmp(subkey, "push")) {
396 const char *v;
397 if (git_config_string(&v, key, value))
398 return -1;
399 refspec_append(&remote->push, v);
400 free((char *)v);
401 } else if (!strcmp(subkey, "fetch")) {
402 const char *v;
403 if (git_config_string(&v, key, value))
404 return -1;
405 refspec_append(&remote->fetch, v);
406 free((char *)v);
407 } else if (!strcmp(subkey, "receivepack")) {
408 const char *v;
409 if (git_config_string(&v, key, value))
410 return -1;
411 if (!remote->receivepack)
412 remote->receivepack = v;
413 else
414 error(_("more than one receivepack given, using the first"));
415 } else if (!strcmp(subkey, "uploadpack")) {
416 const char *v;
417 if (git_config_string(&v, key, value))
418 return -1;
419 if (!remote->uploadpack)
420 remote->uploadpack = v;
421 else
422 error(_("more than one uploadpack given, using the first"));
423 } else if (!strcmp(subkey, "tagopt")) {
424 if (!strcmp(value, "--no-tags"))
425 remote->fetch_tags = -1;
426 else if (!strcmp(value, "--tags"))
427 remote->fetch_tags = 2;
428 } else if (!strcmp(subkey, "proxy")) {
429 return git_config_string((const char **)&remote->http_proxy,
430 key, value);
431 } else if (!strcmp(subkey, "proxyauthmethod")) {
432 return git_config_string((const char **)&remote->http_proxy_authmethod,
433 key, value);
434 } else if (!strcmp(subkey, "vcs")) {
435 return git_config_string(&remote->foreign_vcs, key, value);
436 }
437 return 0;
438 }
439
440 static void alias_all_urls(void)
441 {
442 int i, j;
443 for (i = 0; i < remotes_nr; i++) {
444 int add_pushurl_aliases;
445 if (!remotes[i])
446 continue;
447 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
448 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
449 }
450 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
451 for (j = 0; j < remotes[i]->url_nr; j++) {
452 if (add_pushurl_aliases)
453 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
454 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
455 }
456 }
457 }
458
459 static void read_config(void)
460 {
461 static int loaded;
462 int flag;
463
464 if (loaded)
465 return;
466 loaded = 1;
467
468 current_branch = NULL;
469 if (startup_info->have_repository) {
470 const char *head_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flag);
471 if (head_ref && (flag & REF_ISSYMREF) &&
472 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
473 current_branch = make_branch(head_ref, 0);
474 }
475 }
476 git_config(handle_config, NULL);
477 alias_all_urls();
478 }
479
480 static int valid_remote_nick(const char *name)
481 {
482 if (!name[0] || is_dot_or_dotdot(name))
483 return 0;
484
485 /* remote nicknames cannot contain slashes */
486 while (*name)
487 if (is_dir_sep(*name++))
488 return 0;
489 return 1;
490 }
491
492 const char *remote_for_branch(struct branch *branch, int *explicit)
493 {
494 if (branch && branch->remote_name) {
495 if (explicit)
496 *explicit = 1;
497 return branch->remote_name;
498 }
499 if (explicit)
500 *explicit = 0;
501 return "origin";
502 }
503
504 const char *pushremote_for_branch(struct branch *branch, int *explicit)
505 {
506 if (branch && branch->pushremote_name) {
507 if (explicit)
508 *explicit = 1;
509 return branch->pushremote_name;
510 }
511 if (pushremote_name) {
512 if (explicit)
513 *explicit = 1;
514 return pushremote_name;
515 }
516 return remote_for_branch(branch, explicit);
517 }
518
519 const char *remote_ref_for_branch(struct branch *branch, int for_push)
520 {
521 if (branch) {
522 if (!for_push) {
523 if (branch->merge_nr) {
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 return dst;
535 }
536 }
537 }
538 return NULL;
539 }
540
541 static struct remote *remote_get_1(const char *name,
542 const char *(*get_default)(struct branch *, int *))
543 {
544 struct remote *ret;
545 int name_given = 0;
546
547 read_config();
548
549 if (name)
550 name_given = 1;
551 else
552 name = get_default(current_branch, &name_given);
553
554 ret = make_remote(name, 0);
555 if (valid_remote_nick(name) && have_git_dir()) {
556 if (!valid_remote(ret))
557 read_remotes_file(ret);
558 if (!valid_remote(ret))
559 read_branches_file(ret);
560 }
561 if (name_given && !valid_remote(ret))
562 add_url_alias(ret, name);
563 if (!valid_remote(ret))
564 return NULL;
565 return ret;
566 }
567
568 struct remote *remote_get(const char *name)
569 {
570 return remote_get_1(name, remote_for_branch);
571 }
572
573 struct remote *pushremote_get(const char *name)
574 {
575 return remote_get_1(name, pushremote_for_branch);
576 }
577
578 int remote_is_configured(struct remote *remote, int in_repo)
579 {
580 if (!remote)
581 return 0;
582 if (in_repo)
583 return remote->configured_in_repo;
584 return !!remote->origin;
585 }
586
587 int for_each_remote(each_remote_fn fn, void *priv)
588 {
589 int i, result = 0;
590 read_config();
591 for (i = 0; i < remotes_nr && !result; i++) {
592 struct remote *r = remotes[i];
593 if (!r)
594 continue;
595 result = fn(r, priv);
596 }
597 return result;
598 }
599
600 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
601 {
602 if (strcmp(ref1->name, ref2->name)) {
603 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
604 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
605 die(_("Cannot fetch both %s and %s to %s"),
606 ref1->name, ref2->name, ref2->peer_ref->name);
607 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
608 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
609 warning(_("%s usually tracks %s, not %s"),
610 ref2->peer_ref->name, ref2->name, ref1->name);
611 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
612 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
613 die(_("%s tracks both %s and %s"),
614 ref2->peer_ref->name, ref1->name, ref2->name);
615 } else {
616 /*
617 * This last possibility doesn't occur because
618 * FETCH_HEAD_IGNORE entries always appear at
619 * the end of the list.
620 */
621 BUG("Internal error");
622 }
623 }
624 free(ref2->peer_ref);
625 free(ref2);
626 }
627
628 struct ref *ref_remove_duplicates(struct ref *ref_map)
629 {
630 struct string_list refs = STRING_LIST_INIT_NODUP;
631 struct ref *retval = NULL;
632 struct ref **p = &retval;
633
634 while (ref_map) {
635 struct ref *ref = ref_map;
636
637 ref_map = ref_map->next;
638 ref->next = NULL;
639
640 if (!ref->peer_ref) {
641 *p = ref;
642 p = &ref->next;
643 } else {
644 struct string_list_item *item =
645 string_list_insert(&refs, ref->peer_ref->name);
646
647 if (item->util) {
648 /* Entry already existed */
649 handle_duplicate((struct ref *)item->util, ref);
650 } else {
651 *p = ref;
652 p = &ref->next;
653 item->util = ref;
654 }
655 }
656 }
657
658 string_list_clear(&refs, 0);
659 return retval;
660 }
661
662 int remote_has_url(struct remote *remote, const char *url)
663 {
664 int i;
665 for (i = 0; i < remote->url_nr; i++) {
666 if (!strcmp(remote->url[i], url))
667 return 1;
668 }
669 return 0;
670 }
671
672 static int match_name_with_pattern(const char *key, const char *name,
673 const char *value, char **result)
674 {
675 const char *kstar = strchr(key, '*');
676 size_t klen;
677 size_t ksuffixlen;
678 size_t namelen;
679 int ret;
680 if (!kstar)
681 die(_("key '%s' of pattern had no '*'"), key);
682 klen = kstar - key;
683 ksuffixlen = strlen(kstar + 1);
684 namelen = strlen(name);
685 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
686 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
687 if (ret && value) {
688 struct strbuf sb = STRBUF_INIT;
689 const char *vstar = strchr(value, '*');
690 if (!vstar)
691 die(_("value '%s' of pattern has no '*'"), value);
692 strbuf_add(&sb, value, vstar - value);
693 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
694 strbuf_addstr(&sb, vstar + 1);
695 *result = strbuf_detach(&sb, NULL);
696 }
697 return ret;
698 }
699
700 static void query_refspecs_multiple(struct refspec *rs,
701 struct refspec_item *query,
702 struct string_list *results)
703 {
704 int i;
705 int find_src = !query->src;
706
707 if (find_src && !query->dst)
708 BUG("query_refspecs_multiple: need either src or dst");
709
710 for (i = 0; i < rs->nr; i++) {
711 struct refspec_item *refspec = &rs->items[i];
712 const char *key = find_src ? refspec->dst : refspec->src;
713 const char *value = find_src ? refspec->src : refspec->dst;
714 const char *needle = find_src ? query->dst : query->src;
715 char **result = find_src ? &query->src : &query->dst;
716
717 if (!refspec->dst)
718 continue;
719 if (refspec->pattern) {
720 if (match_name_with_pattern(key, needle, value, result))
721 string_list_append_nodup(results, *result);
722 } else if (!strcmp(needle, key)) {
723 string_list_append(results, value);
724 }
725 }
726 }
727
728 int query_refspecs(struct refspec *rs, struct refspec_item *query)
729 {
730 int i;
731 int find_src = !query->src;
732 const char *needle = find_src ? query->dst : query->src;
733 char **result = find_src ? &query->src : &query->dst;
734
735 if (find_src && !query->dst)
736 BUG("query_refspecs: need either src or dst");
737
738 for (i = 0; i < rs->nr; i++) {
739 struct refspec_item *refspec = &rs->items[i];
740 const char *key = find_src ? refspec->dst : refspec->src;
741 const char *value = find_src ? refspec->src : refspec->dst;
742
743 if (!refspec->dst)
744 continue;
745 if (refspec->pattern) {
746 if (match_name_with_pattern(key, needle, value, result)) {
747 query->force = refspec->force;
748 return 0;
749 }
750 } else if (!strcmp(needle, key)) {
751 *result = xstrdup(value);
752 query->force = refspec->force;
753 return 0;
754 }
755 }
756 return -1;
757 }
758
759 char *apply_refspecs(struct refspec *rs, const char *name)
760 {
761 struct refspec_item query;
762
763 memset(&query, 0, sizeof(struct refspec_item));
764 query.src = (char *)name;
765
766 if (query_refspecs(rs, &query))
767 return NULL;
768
769 return query.dst;
770 }
771
772 int remote_find_tracking(struct remote *remote, struct refspec_item *refspec)
773 {
774 return query_refspecs(&remote->fetch, refspec);
775 }
776
777 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
778 const char *name)
779 {
780 size_t len = strlen(name);
781 struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
782 memcpy(ref->name, prefix, prefixlen);
783 memcpy(ref->name + prefixlen, name, len);
784 return ref;
785 }
786
787 struct ref *alloc_ref(const char *name)
788 {
789 return alloc_ref_with_prefix("", 0, name);
790 }
791
792 struct ref *copy_ref(const struct ref *ref)
793 {
794 struct ref *cpy;
795 size_t len;
796 if (!ref)
797 return NULL;
798 len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
799 cpy = xmalloc(len);
800 memcpy(cpy, ref, len);
801 cpy->next = NULL;
802 cpy->symref = xstrdup_or_null(ref->symref);
803 cpy->remote_status = xstrdup_or_null(ref->remote_status);
804 cpy->peer_ref = copy_ref(ref->peer_ref);
805 return cpy;
806 }
807
808 struct ref *copy_ref_list(const struct ref *ref)
809 {
810 struct ref *ret = NULL;
811 struct ref **tail = &ret;
812 while (ref) {
813 *tail = copy_ref(ref);
814 ref = ref->next;
815 tail = &((*tail)->next);
816 }
817 return ret;
818 }
819
820 void free_one_ref(struct ref *ref)
821 {
822 if (!ref)
823 return;
824 free_one_ref(ref->peer_ref);
825 free(ref->remote_status);
826 free(ref->symref);
827 free(ref);
828 }
829
830 void free_refs(struct ref *ref)
831 {
832 struct ref *next;
833 while (ref) {
834 next = ref->next;
835 free_one_ref(ref);
836 ref = next;
837 }
838 }
839
840 int ref_compare_name(const void *va, const void *vb)
841 {
842 const struct ref *a = va, *b = vb;
843 return strcmp(a->name, b->name);
844 }
845
846 static void *ref_list_get_next(const void *a)
847 {
848 return ((const struct ref *)a)->next;
849 }
850
851 static void ref_list_set_next(void *a, void *next)
852 {
853 ((struct ref *)a)->next = next;
854 }
855
856 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
857 {
858 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
859 }
860
861 int count_refspec_match(const char *pattern,
862 struct ref *refs,
863 struct ref **matched_ref)
864 {
865 int patlen = strlen(pattern);
866 struct ref *matched_weak = NULL;
867 struct ref *matched = NULL;
868 int weak_match = 0;
869 int match = 0;
870
871 for (weak_match = match = 0; refs; refs = refs->next) {
872 char *name = refs->name;
873 int namelen = strlen(name);
874
875 if (!refname_match(pattern, name))
876 continue;
877
878 /* A match is "weak" if it is with refs outside
879 * heads or tags, and did not specify the pattern
880 * in full (e.g. "refs/remotes/origin/master") or at
881 * least from the toplevel (e.g. "remotes/origin/master");
882 * otherwise "git push $URL master" would result in
883 * ambiguity between remotes/origin/master and heads/master
884 * at the remote site.
885 */
886 if (namelen != patlen &&
887 patlen != namelen - 5 &&
888 !starts_with(name, "refs/heads/") &&
889 !starts_with(name, "refs/tags/")) {
890 /* We want to catch the case where only weak
891 * matches are found and there are multiple
892 * matches, and where more than one strong
893 * matches are found, as ambiguous. One
894 * strong match with zero or more weak matches
895 * are acceptable as a unique match.
896 */
897 matched_weak = refs;
898 weak_match++;
899 }
900 else {
901 matched = refs;
902 match++;
903 }
904 }
905 if (!matched) {
906 if (matched_ref)
907 *matched_ref = matched_weak;
908 return weak_match;
909 }
910 else {
911 if (matched_ref)
912 *matched_ref = matched;
913 return match;
914 }
915 }
916
917 static void tail_link_ref(struct ref *ref, struct ref ***tail)
918 {
919 **tail = ref;
920 while (ref->next)
921 ref = ref->next;
922 *tail = &ref->next;
923 }
924
925 static struct ref *alloc_delete_ref(void)
926 {
927 struct ref *ref = alloc_ref("(delete)");
928 oidclr(&ref->new_oid);
929 return ref;
930 }
931
932 static int try_explicit_object_name(const char *name,
933 struct ref **match)
934 {
935 struct object_id oid;
936
937 if (!*name) {
938 if (match)
939 *match = alloc_delete_ref();
940 return 0;
941 }
942
943 if (get_oid(name, &oid))
944 return -1;
945
946 if (match) {
947 *match = alloc_ref(name);
948 oidcpy(&(*match)->new_oid, &oid);
949 }
950 return 0;
951 }
952
953 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
954 {
955 struct ref *ret = alloc_ref(name);
956 tail_link_ref(ret, tail);
957 return ret;
958 }
959
960 static char *guess_ref(const char *name, struct ref *peer)
961 {
962 struct strbuf buf = STRBUF_INIT;
963
964 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
965 NULL, NULL);
966 if (!r)
967 return NULL;
968
969 if (starts_with(r, "refs/heads/")) {
970 strbuf_addstr(&buf, "refs/heads/");
971 } else if (starts_with(r, "refs/tags/")) {
972 strbuf_addstr(&buf, "refs/tags/");
973 } else {
974 return NULL;
975 }
976
977 strbuf_addstr(&buf, name);
978 return strbuf_detach(&buf, NULL);
979 }
980
981 static int match_explicit_lhs(struct ref *src,
982 struct refspec_item *rs,
983 struct ref **match,
984 int *allocated_match)
985 {
986 switch (count_refspec_match(rs->src, src, match)) {
987 case 1:
988 if (allocated_match)
989 *allocated_match = 0;
990 return 0;
991 case 0:
992 /* The source could be in the get_sha1() format
993 * not a reference name. :refs/other is a
994 * way to delete 'other' ref at the remote end.
995 */
996 if (try_explicit_object_name(rs->src, match) < 0)
997 return error(_("src refspec %s does not match any"), rs->src);
998 if (allocated_match)
999 *allocated_match = 1;
1000 return 0;
1001 default:
1002 return error(_("src refspec %s matches more than one"), rs->src);
1003 }
1004 }
1005
1006 static void show_push_unqualified_ref_name_error(const char *dst_value,
1007 const char *matched_src_name)
1008 {
1009 struct object_id oid;
1010 enum object_type type;
1011
1012 /*
1013 * TRANSLATORS: "matches '%s'%" is the <dst> part of "git push
1014 * <remote> <src>:<dst>" push, and "being pushed ('%s')" is
1015 * the <src>.
1016 */
1017 error(_("The destination you provided is not a full refname (i.e.,\n"
1018 "starting with \"refs/\"). We tried to guess what you meant by:\n"
1019 "\n"
1020 "- Looking for a ref that matches '%s' on the remote side.\n"
1021 "- Checking if the <src> being pushed ('%s')\n"
1022 " is a ref in \"refs/{heads,tags}/\". If so we add a corresponding\n"
1023 " refs/{heads,tags}/ prefix on the remote side.\n"
1024 "\n"
1025 "Neither worked, so we gave up. You must fully qualify the ref."),
1026 dst_value, matched_src_name);
1027
1028 if (!advice_push_unqualified_ref_name)
1029 return;
1030
1031 if (get_oid(matched_src_name, &oid))
1032 BUG("'%s' is not a valid object, "
1033 "match_explicit_lhs() should catch this!",
1034 matched_src_name);
1035 type = oid_object_info(the_repository, &oid, NULL);
1036 if (type == OBJ_COMMIT) {
1037 advise(_("The <src> part of the refspec is a commit object.\n"
1038 "Did you mean to create a new branch by pushing to\n"
1039 "'%s:refs/heads/%s'?"),
1040 matched_src_name, dst_value);
1041 } else if (type == OBJ_TAG) {
1042 advise(_("The <src> part of the refspec is a tag object.\n"
1043 "Did you mean to create a new tag by pushing to\n"
1044 "'%s:refs/tags/%s'?"),
1045 matched_src_name, dst_value);
1046 } else if (type == OBJ_TREE) {
1047 advise(_("The <src> part of the refspec is a tree object.\n"
1048 "Did you mean to tag a new tree by pushing to\n"
1049 "'%s:refs/tags/%s'?"),
1050 matched_src_name, dst_value);
1051 } else if (type == OBJ_BLOB) {
1052 advise(_("The <src> part of the refspec is a blob object.\n"
1053 "Did you mean to tag a new blob by pushing to\n"
1054 "'%s:refs/tags/%s'?"),
1055 matched_src_name, dst_value);
1056 } else {
1057 BUG("'%s' should be commit/tag/tree/blob, is '%d'",
1058 matched_src_name, type);
1059 }
1060 }
1061
1062 static int match_explicit(struct ref *src, struct ref *dst,
1063 struct ref ***dst_tail,
1064 struct refspec_item *rs)
1065 {
1066 struct ref *matched_src, *matched_dst;
1067 int allocated_src;
1068
1069 const char *dst_value = rs->dst;
1070 char *dst_guess;
1071
1072 if (rs->pattern || rs->matching)
1073 return 0;
1074
1075 matched_src = matched_dst = NULL;
1076 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1077 return -1;
1078
1079 if (!dst_value) {
1080 int flag;
1081
1082 dst_value = resolve_ref_unsafe(matched_src->name,
1083 RESOLVE_REF_READING,
1084 NULL, &flag);
1085 if (!dst_value ||
1086 ((flag & REF_ISSYMREF) &&
1087 !starts_with(dst_value, "refs/heads/")))
1088 die(_("%s cannot be resolved to branch"),
1089 matched_src->name);
1090 }
1091
1092 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1093 case 1:
1094 break;
1095 case 0:
1096 if (starts_with(dst_value, "refs/")) {
1097 matched_dst = make_linked_ref(dst_value, dst_tail);
1098 } else if (is_null_oid(&matched_src->new_oid)) {
1099 error(_("unable to delete '%s': remote ref does not exist"),
1100 dst_value);
1101 } else if ((dst_guess = guess_ref(dst_value, matched_src))) {
1102 matched_dst = make_linked_ref(dst_guess, dst_tail);
1103 free(dst_guess);
1104 } else {
1105 show_push_unqualified_ref_name_error(dst_value,
1106 matched_src->name);
1107 }
1108 break;
1109 default:
1110 matched_dst = NULL;
1111 error(_("dst refspec %s matches more than one"),
1112 dst_value);
1113 break;
1114 }
1115 if (!matched_dst)
1116 return -1;
1117 if (matched_dst->peer_ref)
1118 return error(_("dst ref %s receives from more than one src"),
1119 matched_dst->name);
1120 else {
1121 matched_dst->peer_ref = allocated_src ?
1122 matched_src :
1123 copy_ref(matched_src);
1124 matched_dst->force = rs->force;
1125 }
1126 return 0;
1127 }
1128
1129 static int match_explicit_refs(struct ref *src, struct ref *dst,
1130 struct ref ***dst_tail, struct refspec *rs)
1131 {
1132 int i, errs;
1133 for (i = errs = 0; i < rs->nr; i++)
1134 errs += match_explicit(src, dst, dst_tail, &rs->items[i]);
1135 return errs;
1136 }
1137
1138 static char *get_ref_match(const struct refspec *rs, const struct ref *ref,
1139 int send_mirror, int direction,
1140 const struct refspec_item **ret_pat)
1141 {
1142 const struct refspec_item *pat;
1143 char *name;
1144 int i;
1145 int matching_refs = -1;
1146 for (i = 0; i < rs->nr; i++) {
1147 const struct refspec_item *item = &rs->items[i];
1148 if (item->matching &&
1149 (matching_refs == -1 || item->force)) {
1150 matching_refs = i;
1151 continue;
1152 }
1153
1154 if (item->pattern) {
1155 const char *dst_side = item->dst ? item->dst : item->src;
1156 int match;
1157 if (direction == FROM_SRC)
1158 match = match_name_with_pattern(item->src, ref->name, dst_side, &name);
1159 else
1160 match = match_name_with_pattern(dst_side, ref->name, item->src, &name);
1161 if (match) {
1162 matching_refs = i;
1163 break;
1164 }
1165 }
1166 }
1167 if (matching_refs == -1)
1168 return NULL;
1169
1170 pat = &rs->items[matching_refs];
1171 if (pat->matching) {
1172 /*
1173 * "matching refs"; traditionally we pushed everything
1174 * including refs outside refs/heads/ hierarchy, but
1175 * that does not make much sense these days.
1176 */
1177 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1178 return NULL;
1179 name = xstrdup(ref->name);
1180 }
1181 if (ret_pat)
1182 *ret_pat = pat;
1183 return name;
1184 }
1185
1186 static struct ref **tail_ref(struct ref **head)
1187 {
1188 struct ref **tail = head;
1189 while (*tail)
1190 tail = &((*tail)->next);
1191 return tail;
1192 }
1193
1194 struct tips {
1195 struct commit **tip;
1196 int nr, alloc;
1197 };
1198
1199 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1200 {
1201 struct commit *commit;
1202
1203 if (is_null_oid(oid))
1204 return;
1205 commit = lookup_commit_reference_gently(the_repository, oid, 1);
1206 if (!commit || (commit->object.flags & TMP_MARK))
1207 return;
1208 commit->object.flags |= TMP_MARK;
1209 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1210 tips->tip[tips->nr++] = commit;
1211 }
1212
1213 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1214 {
1215 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1216 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1217 struct string_list_item *item;
1218 struct ref *ref;
1219 struct tips sent_tips;
1220
1221 /*
1222 * Collect everything we know they would have at the end of
1223 * this push, and collect all tags they have.
1224 */
1225 memset(&sent_tips, 0, sizeof(sent_tips));
1226 for (ref = *dst; ref; ref = ref->next) {
1227 if (ref->peer_ref &&
1228 !is_null_oid(&ref->peer_ref->new_oid))
1229 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1230 else
1231 add_to_tips(&sent_tips, &ref->old_oid);
1232 if (starts_with(ref->name, "refs/tags/"))
1233 string_list_append(&dst_tag, ref->name);
1234 }
1235 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1236
1237 string_list_sort(&dst_tag);
1238
1239 /* Collect tags they do not have. */
1240 for (ref = src; ref; ref = ref->next) {
1241 if (!starts_with(ref->name, "refs/tags/"))
1242 continue; /* not a tag */
1243 if (string_list_has_string(&dst_tag, ref->name))
1244 continue; /* they already have it */
1245 if (oid_object_info(the_repository, &ref->new_oid, NULL) != OBJ_TAG)
1246 continue; /* be conservative */
1247 item = string_list_append(&src_tag, ref->name);
1248 item->util = ref;
1249 }
1250 string_list_clear(&dst_tag, 0);
1251
1252 /*
1253 * At this point, src_tag lists tags that are missing from
1254 * dst, and sent_tips lists the tips we are pushing or those
1255 * that we know they already have. An element in the src_tag
1256 * that is an ancestor of any of the sent_tips needs to be
1257 * sent to the other side.
1258 */
1259 if (sent_tips.nr) {
1260 const int reachable_flag = 1;
1261 struct commit_list *found_commits;
1262 struct commit **src_commits;
1263 int nr_src_commits = 0, alloc_src_commits = 16;
1264 ALLOC_ARRAY(src_commits, alloc_src_commits);
1265
1266 for_each_string_list_item(item, &src_tag) {
1267 struct ref *ref = item->util;
1268 struct commit *commit;
1269
1270 if (is_null_oid(&ref->new_oid))
1271 continue;
1272 commit = lookup_commit_reference_gently(the_repository,
1273 &ref->new_oid,
1274 1);
1275 if (!commit)
1276 /* not pushing a commit, which is not an error */
1277 continue;
1278
1279 ALLOC_GROW(src_commits, nr_src_commits + 1, alloc_src_commits);
1280 src_commits[nr_src_commits++] = commit;
1281 }
1282
1283 found_commits = get_reachable_subset(sent_tips.tip, sent_tips.nr,
1284 src_commits, nr_src_commits,
1285 reachable_flag);
1286
1287 for_each_string_list_item(item, &src_tag) {
1288 struct ref *dst_ref;
1289 struct ref *ref = item->util;
1290 struct commit *commit;
1291
1292 if (is_null_oid(&ref->new_oid))
1293 continue;
1294 commit = lookup_commit_reference_gently(the_repository,
1295 &ref->new_oid,
1296 1);
1297 if (!commit)
1298 /* not pushing a commit, which is not an error */
1299 continue;
1300
1301 /*
1302 * Is this tag, which they do not have, reachable from
1303 * any of the commits we are sending?
1304 */
1305 if (!(commit->object.flags & reachable_flag))
1306 continue;
1307
1308 /* Add it in */
1309 dst_ref = make_linked_ref(ref->name, dst_tail);
1310 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1311 dst_ref->peer_ref = copy_ref(ref);
1312 }
1313
1314 clear_commit_marks_many(nr_src_commits, src_commits, reachable_flag);
1315 free(src_commits);
1316 free_commit_list(found_commits);
1317 }
1318
1319 string_list_clear(&src_tag, 0);
1320 free(sent_tips.tip);
1321 }
1322
1323 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1324 {
1325 for ( ; list; list = list->next)
1326 if (!strcmp(list->name, name))
1327 return (struct ref *)list;
1328 return NULL;
1329 }
1330
1331 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1332 {
1333 for ( ; ref; ref = ref->next)
1334 string_list_append_nodup(ref_index, ref->name)->util = ref;
1335
1336 string_list_sort(ref_index);
1337 }
1338
1339 /*
1340 * Given only the set of local refs, sanity-check the set of push
1341 * refspecs. We can't catch all errors that match_push_refs would,
1342 * but we can catch some errors early before even talking to the
1343 * remote side.
1344 */
1345 int check_push_refs(struct ref *src, struct refspec *rs)
1346 {
1347 int ret = 0;
1348 int i;
1349
1350 for (i = 0; i < rs->nr; i++) {
1351 struct refspec_item *item = &rs->items[i];
1352
1353 if (item->pattern || item->matching)
1354 continue;
1355
1356 ret |= match_explicit_lhs(src, item, NULL, NULL);
1357 }
1358
1359 return ret;
1360 }
1361
1362 /*
1363 * Given the set of refs the local repository has, the set of refs the
1364 * remote repository has, and the refspec used for push, determine
1365 * what remote refs we will update and with what value by setting
1366 * peer_ref (which object is being pushed) and force (if the push is
1367 * forced) in elements of "dst". The function may add new elements to
1368 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1369 */
1370 int match_push_refs(struct ref *src, struct ref **dst,
1371 struct refspec *rs, int flags)
1372 {
1373 int send_all = flags & MATCH_REFS_ALL;
1374 int send_mirror = flags & MATCH_REFS_MIRROR;
1375 int send_prune = flags & MATCH_REFS_PRUNE;
1376 int errs;
1377 struct ref *ref, **dst_tail = tail_ref(dst);
1378 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1379
1380 /* If no refspec is provided, use the default ":" */
1381 if (!rs->nr)
1382 refspec_append(rs, ":");
1383
1384 errs = match_explicit_refs(src, *dst, &dst_tail, rs);
1385
1386 /* pick the remainder */
1387 for (ref = src; ref; ref = ref->next) {
1388 struct string_list_item *dst_item;
1389 struct ref *dst_peer;
1390 const struct refspec_item *pat = NULL;
1391 char *dst_name;
1392
1393 dst_name = get_ref_match(rs, ref, send_mirror, FROM_SRC, &pat);
1394 if (!dst_name)
1395 continue;
1396
1397 if (!dst_ref_index.nr)
1398 prepare_ref_index(&dst_ref_index, *dst);
1399
1400 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1401 dst_peer = dst_item ? dst_item->util : NULL;
1402 if (dst_peer) {
1403 if (dst_peer->peer_ref)
1404 /* We're already sending something to this ref. */
1405 goto free_name;
1406 } else {
1407 if (pat->matching && !(send_all || send_mirror))
1408 /*
1409 * Remote doesn't have it, and we have no
1410 * explicit pattern, and we don't have
1411 * --all or --mirror.
1412 */
1413 goto free_name;
1414
1415 /* Create a new one and link it */
1416 dst_peer = make_linked_ref(dst_name, &dst_tail);
1417 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1418 string_list_insert(&dst_ref_index,
1419 dst_peer->name)->util = dst_peer;
1420 }
1421 dst_peer->peer_ref = copy_ref(ref);
1422 dst_peer->force = pat->force;
1423 free_name:
1424 free(dst_name);
1425 }
1426
1427 string_list_clear(&dst_ref_index, 0);
1428
1429 if (flags & MATCH_REFS_FOLLOW_TAGS)
1430 add_missing_tags(src, dst, &dst_tail);
1431
1432 if (send_prune) {
1433 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1434 /* check for missing refs on the remote */
1435 for (ref = *dst; ref; ref = ref->next) {
1436 char *src_name;
1437
1438 if (ref->peer_ref)
1439 /* We're already sending something to this ref. */
1440 continue;
1441
1442 src_name = get_ref_match(rs, ref, send_mirror, FROM_DST, NULL);
1443 if (src_name) {
1444 if (!src_ref_index.nr)
1445 prepare_ref_index(&src_ref_index, src);
1446 if (!string_list_has_string(&src_ref_index,
1447 src_name))
1448 ref->peer_ref = alloc_delete_ref();
1449 free(src_name);
1450 }
1451 }
1452 string_list_clear(&src_ref_index, 0);
1453 }
1454
1455 if (errs)
1456 return -1;
1457 return 0;
1458 }
1459
1460 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1461 int force_update)
1462 {
1463 struct ref *ref;
1464
1465 for (ref = remote_refs; ref; ref = ref->next) {
1466 int force_ref_update = ref->force || force_update;
1467 int reject_reason = 0;
1468
1469 if (ref->peer_ref)
1470 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1471 else if (!send_mirror)
1472 continue;
1473
1474 ref->deletion = is_null_oid(&ref->new_oid);
1475 if (!ref->deletion &&
1476 oideq(&ref->old_oid, &ref->new_oid)) {
1477 ref->status = REF_STATUS_UPTODATE;
1478 continue;
1479 }
1480
1481 /*
1482 * If the remote ref has moved and is now different
1483 * from what we expect, reject any push.
1484 *
1485 * It also is an error if the user told us to check
1486 * with the remote-tracking branch to find the value
1487 * to expect, but we did not have such a tracking
1488 * branch.
1489 */
1490 if (ref->expect_old_sha1) {
1491 if (!oideq(&ref->old_oid, &ref->old_oid_expect))
1492 reject_reason = REF_STATUS_REJECT_STALE;
1493 else
1494 /* If the ref isn't stale then force the update. */
1495 force_ref_update = 1;
1496 }
1497
1498 /*
1499 * If the update isn't already rejected then check
1500 * the usual "must fast-forward" rules.
1501 *
1502 * Decide whether an individual refspec A:B can be
1503 * pushed. The push will succeed if any of the
1504 * following are true:
1505 *
1506 * (1) the remote reference B does not exist
1507 *
1508 * (2) the remote reference B is being removed (i.e.,
1509 * pushing :B where no source is specified)
1510 *
1511 * (3) the destination is not under refs/tags/, and
1512 * if the old and new value is a commit, the new
1513 * is a descendant of the old.
1514 *
1515 * (4) it is forced using the +A:B notation, or by
1516 * passing the --force argument
1517 */
1518
1519 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1520 if (starts_with(ref->name, "refs/tags/"))
1521 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1522 else if (!has_object_file(&ref->old_oid))
1523 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1524 else if (!lookup_commit_reference_gently(the_repository, &ref->old_oid, 1) ||
1525 !lookup_commit_reference_gently(the_repository, &ref->new_oid, 1))
1526 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1527 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1528 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1529 }
1530
1531 /*
1532 * "--force" will defeat any rejection implemented
1533 * by the rules above.
1534 */
1535 if (!force_ref_update)
1536 ref->status = reject_reason;
1537 else if (reject_reason)
1538 ref->forced_update = 1;
1539 }
1540 }
1541
1542 static void set_merge(struct branch *ret)
1543 {
1544 struct remote *remote;
1545 char *ref;
1546 struct object_id oid;
1547 int i;
1548
1549 if (!ret)
1550 return; /* no branch */
1551 if (ret->merge)
1552 return; /* already run */
1553 if (!ret->remote_name || !ret->merge_nr) {
1554 /*
1555 * no merge config; let's make sure we don't confuse callers
1556 * with a non-zero merge_nr but a NULL merge
1557 */
1558 ret->merge_nr = 0;
1559 return;
1560 }
1561
1562 remote = remote_get(ret->remote_name);
1563
1564 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1565 for (i = 0; i < ret->merge_nr; i++) {
1566 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1567 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1568 if (!remote_find_tracking(remote, ret->merge[i]) ||
1569 strcmp(ret->remote_name, "."))
1570 continue;
1571 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1572 &oid, &ref) == 1)
1573 ret->merge[i]->dst = ref;
1574 else
1575 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1576 }
1577 }
1578
1579 struct branch *branch_get(const char *name)
1580 {
1581 struct branch *ret;
1582
1583 read_config();
1584 if (!name || !*name || !strcmp(name, "HEAD"))
1585 ret = current_branch;
1586 else
1587 ret = make_branch(name, 0);
1588 set_merge(ret);
1589 return ret;
1590 }
1591
1592 int branch_has_merge_config(struct branch *branch)
1593 {
1594 return branch && !!branch->merge;
1595 }
1596
1597 int branch_merge_matches(struct branch *branch,
1598 int i,
1599 const char *refname)
1600 {
1601 if (!branch || i < 0 || i >= branch->merge_nr)
1602 return 0;
1603 return refname_match(branch->merge[i]->src, refname);
1604 }
1605
1606 __attribute__((format (printf,2,3)))
1607 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1608 {
1609 if (err) {
1610 va_list ap;
1611 va_start(ap, fmt);
1612 strbuf_vaddf(err, fmt, ap);
1613 va_end(ap);
1614 }
1615 return NULL;
1616 }
1617
1618 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1619 {
1620 if (!branch)
1621 return error_buf(err, _("HEAD does not point to a branch"));
1622
1623 if (!branch->merge || !branch->merge[0]) {
1624 /*
1625 * no merge config; is it because the user didn't define any,
1626 * or because it is not a real branch, and get_branch
1627 * auto-vivified it?
1628 */
1629 if (!ref_exists(branch->refname))
1630 return error_buf(err, _("no such branch: '%s'"),
1631 branch->name);
1632 return error_buf(err,
1633 _("no upstream configured for branch '%s'"),
1634 branch->name);
1635 }
1636
1637 if (!branch->merge[0]->dst)
1638 return error_buf(err,
1639 _("upstream branch '%s' not stored as a remote-tracking branch"),
1640 branch->merge[0]->src);
1641
1642 return branch->merge[0]->dst;
1643 }
1644
1645 static const char *tracking_for_push_dest(struct remote *remote,
1646 const char *refname,
1647 struct strbuf *err)
1648 {
1649 char *ret;
1650
1651 ret = apply_refspecs(&remote->fetch, refname);
1652 if (!ret)
1653 return error_buf(err,
1654 _("push destination '%s' on remote '%s' has no local tracking branch"),
1655 refname, remote->name);
1656 return ret;
1657 }
1658
1659 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1660 {
1661 struct remote *remote;
1662
1663 remote = remote_get(pushremote_for_branch(branch, NULL));
1664 if (!remote)
1665 return error_buf(err,
1666 _("branch '%s' has no remote for pushing"),
1667 branch->name);
1668
1669 if (remote->push.nr) {
1670 char *dst;
1671 const char *ret;
1672
1673 dst = apply_refspecs(&remote->push, branch->refname);
1674 if (!dst)
1675 return error_buf(err,
1676 _("push refspecs for '%s' do not include '%s'"),
1677 remote->name, branch->name);
1678
1679 ret = tracking_for_push_dest(remote, dst, err);
1680 free(dst);
1681 return ret;
1682 }
1683
1684 if (remote->mirror)
1685 return tracking_for_push_dest(remote, branch->refname, err);
1686
1687 switch (push_default) {
1688 case PUSH_DEFAULT_NOTHING:
1689 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1690
1691 case PUSH_DEFAULT_MATCHING:
1692 case PUSH_DEFAULT_CURRENT:
1693 return tracking_for_push_dest(remote, branch->refname, err);
1694
1695 case PUSH_DEFAULT_UPSTREAM:
1696 return branch_get_upstream(branch, err);
1697
1698 case PUSH_DEFAULT_UNSPECIFIED:
1699 case PUSH_DEFAULT_SIMPLE:
1700 {
1701 const char *up, *cur;
1702
1703 up = branch_get_upstream(branch, err);
1704 if (!up)
1705 return NULL;
1706 cur = tracking_for_push_dest(remote, branch->refname, err);
1707 if (!cur)
1708 return NULL;
1709 if (strcmp(cur, up))
1710 return error_buf(err,
1711 _("cannot resolve 'simple' push to a single destination"));
1712 return cur;
1713 }
1714 }
1715
1716 BUG("unhandled push situation");
1717 }
1718
1719 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1720 {
1721 if (!branch)
1722 return error_buf(err, _("HEAD does not point to a branch"));
1723
1724 if (!branch->push_tracking_ref)
1725 branch->push_tracking_ref = branch_get_push_1(branch, err);
1726 return branch->push_tracking_ref;
1727 }
1728
1729 static int ignore_symref_update(const char *refname)
1730 {
1731 int flag;
1732
1733 if (!resolve_ref_unsafe(refname, 0, NULL, &flag))
1734 return 0; /* non-existing refs are OK */
1735 return (flag & REF_ISSYMREF);
1736 }
1737
1738 /*
1739 * Create and return a list of (struct ref) consisting of copies of
1740 * each remote_ref that matches refspec. refspec must be a pattern.
1741 * Fill in the copies' peer_ref to describe the local tracking refs to
1742 * which they map. Omit any references that would map to an existing
1743 * local symbolic ref.
1744 */
1745 static struct ref *get_expanded_map(const struct ref *remote_refs,
1746 const struct refspec_item *refspec)
1747 {
1748 const struct ref *ref;
1749 struct ref *ret = NULL;
1750 struct ref **tail = &ret;
1751
1752 for (ref = remote_refs; ref; ref = ref->next) {
1753 char *expn_name = NULL;
1754
1755 if (strchr(ref->name, '^'))
1756 continue; /* a dereference item */
1757 if (match_name_with_pattern(refspec->src, ref->name,
1758 refspec->dst, &expn_name) &&
1759 !ignore_symref_update(expn_name)) {
1760 struct ref *cpy = copy_ref(ref);
1761
1762 cpy->peer_ref = alloc_ref(expn_name);
1763 if (refspec->force)
1764 cpy->peer_ref->force = 1;
1765 *tail = cpy;
1766 tail = &cpy->next;
1767 }
1768 free(expn_name);
1769 }
1770
1771 return ret;
1772 }
1773
1774 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1775 {
1776 const struct ref *ref;
1777 const struct ref *best_match = NULL;
1778 int best_score = 0;
1779
1780 for (ref = refs; ref; ref = ref->next) {
1781 int score = refname_match(name, ref->name);
1782
1783 if (best_score < score) {
1784 best_match = ref;
1785 best_score = score;
1786 }
1787 }
1788 return best_match;
1789 }
1790
1791 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1792 {
1793 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1794
1795 if (!ref)
1796 return NULL;
1797
1798 return copy_ref(ref);
1799 }
1800
1801 static struct ref *get_local_ref(const char *name)
1802 {
1803 if (!name || name[0] == '\0')
1804 return NULL;
1805
1806 if (starts_with(name, "refs/"))
1807 return alloc_ref(name);
1808
1809 if (starts_with(name, "heads/") ||
1810 starts_with(name, "tags/") ||
1811 starts_with(name, "remotes/"))
1812 return alloc_ref_with_prefix("refs/", 5, name);
1813
1814 return alloc_ref_with_prefix("refs/heads/", 11, name);
1815 }
1816
1817 int get_fetch_map(const struct ref *remote_refs,
1818 const struct refspec_item *refspec,
1819 struct ref ***tail,
1820 int missing_ok)
1821 {
1822 struct ref *ref_map, **rmp;
1823
1824 if (refspec->pattern) {
1825 ref_map = get_expanded_map(remote_refs, refspec);
1826 } else {
1827 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1828
1829 if (refspec->exact_sha1) {
1830 ref_map = alloc_ref(name);
1831 get_oid_hex(name, &ref_map->old_oid);
1832 ref_map->exact_oid = 1;
1833 } else {
1834 ref_map = get_remote_ref(remote_refs, name);
1835 }
1836 if (!missing_ok && !ref_map)
1837 die(_("couldn't find remote ref %s"), name);
1838 if (ref_map) {
1839 ref_map->peer_ref = get_local_ref(refspec->dst);
1840 if (ref_map->peer_ref && refspec->force)
1841 ref_map->peer_ref->force = 1;
1842 }
1843 }
1844
1845 for (rmp = &ref_map; *rmp; ) {
1846 if ((*rmp)->peer_ref) {
1847 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1848 check_refname_format((*rmp)->peer_ref->name, 0)) {
1849 struct ref *ignore = *rmp;
1850 error(_("* Ignoring funny ref '%s' locally"),
1851 (*rmp)->peer_ref->name);
1852 *rmp = (*rmp)->next;
1853 free(ignore->peer_ref);
1854 free(ignore);
1855 continue;
1856 }
1857 }
1858 rmp = &((*rmp)->next);
1859 }
1860
1861 if (ref_map)
1862 tail_link_ref(ref_map, tail);
1863
1864 return 0;
1865 }
1866
1867 int resolve_remote_symref(struct ref *ref, struct ref *list)
1868 {
1869 if (!ref->symref)
1870 return 0;
1871 for (; list; list = list->next)
1872 if (!strcmp(ref->symref, list->name)) {
1873 oidcpy(&ref->old_oid, &list->old_oid);
1874 return 0;
1875 }
1876 return 1;
1877 }
1878
1879 /*
1880 * Compute the commit ahead/behind values for the pair branch_name, base.
1881 *
1882 * If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
1883 * counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
1884 * the (potentially expensive) a/b computation (*num_ours and *num_theirs are
1885 * set to zero).
1886 *
1887 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., ref
1888 * does not exist). Returns 0 if the commits are identical. Returns 1 if
1889 * commits are different.
1890 */
1891
1892 static int stat_branch_pair(const char *branch_name, const char *base,
1893 int *num_ours, int *num_theirs,
1894 enum ahead_behind_flags abf)
1895 {
1896 struct object_id oid;
1897 struct commit *ours, *theirs;
1898 struct rev_info revs;
1899 struct argv_array argv = ARGV_ARRAY_INIT;
1900
1901 /* Cannot stat if what we used to build on no longer exists */
1902 if (read_ref(base, &oid))
1903 return -1;
1904 theirs = lookup_commit_reference(the_repository, &oid);
1905 if (!theirs)
1906 return -1;
1907
1908 if (read_ref(branch_name, &oid))
1909 return -1;
1910 ours = lookup_commit_reference(the_repository, &oid);
1911 if (!ours)
1912 return -1;
1913
1914 *num_theirs = *num_ours = 0;
1915
1916 /* are we the same? */
1917 if (theirs == ours)
1918 return 0;
1919 if (abf == AHEAD_BEHIND_QUICK)
1920 return 1;
1921 if (abf != AHEAD_BEHIND_FULL)
1922 BUG("stat_branch_pair: invalid abf '%d'", abf);
1923
1924 /* Run "rev-list --left-right ours...theirs" internally... */
1925 argv_array_push(&argv, ""); /* ignored */
1926 argv_array_push(&argv, "--left-right");
1927 argv_array_pushf(&argv, "%s...%s",
1928 oid_to_hex(&ours->object.oid),
1929 oid_to_hex(&theirs->object.oid));
1930 argv_array_push(&argv, "--");
1931
1932 repo_init_revisions(the_repository, &revs, NULL);
1933 setup_revisions(argv.argc, argv.argv, &revs, NULL);
1934 if (prepare_revision_walk(&revs))
1935 die(_("revision walk setup failed"));
1936
1937 /* ... and count the commits on each side. */
1938 while (1) {
1939 struct commit *c = get_revision(&revs);
1940 if (!c)
1941 break;
1942 if (c->object.flags & SYMMETRIC_LEFT)
1943 (*num_ours)++;
1944 else
1945 (*num_theirs)++;
1946 }
1947
1948 /* clear object flags smudged by the above traversal */
1949 clear_commit_marks(ours, ALL_REV_FLAGS);
1950 clear_commit_marks(theirs, ALL_REV_FLAGS);
1951
1952 argv_array_clear(&argv);
1953 return 1;
1954 }
1955
1956 /*
1957 * Lookup the tracking branch for the given branch and if present, optionally
1958 * compute the commit ahead/behind values for the pair.
1959 *
1960 * If for_push is true, the tracking branch refers to the push branch,
1961 * otherwise it refers to the upstream branch.
1962 *
1963 * The name of the tracking branch (or NULL if it is not defined) is
1964 * returned via *tracking_name, if it is not itself NULL.
1965 *
1966 * If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
1967 * counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
1968 * the (potentially expensive) a/b computation (*num_ours and *num_theirs are
1969 * set to zero).
1970 *
1971 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1972 * upstream defined, or ref does not exist). Returns 0 if the commits are
1973 * identical. Returns 1 if commits are different.
1974 */
1975 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1976 const char **tracking_name, int for_push,
1977 enum ahead_behind_flags abf)
1978 {
1979 const char *base;
1980
1981 /* Cannot stat unless we are marked to build on top of somebody else. */
1982 base = for_push ? branch_get_push(branch, NULL) :
1983 branch_get_upstream(branch, NULL);
1984 if (tracking_name)
1985 *tracking_name = base;
1986 if (!base)
1987 return -1;
1988
1989 return stat_branch_pair(branch->refname, base, num_ours, num_theirs, abf);
1990 }
1991
1992 /*
1993 * Return true when there is anything to report, otherwise false.
1994 */
1995 int format_tracking_info(struct branch *branch, struct strbuf *sb,
1996 enum ahead_behind_flags abf)
1997 {
1998 int ours, theirs, sti;
1999 const char *full_base;
2000 char *base;
2001 int upstream_is_gone = 0;
2002
2003 sti = stat_tracking_info(branch, &ours, &theirs, &full_base, 0, abf);
2004 if (sti < 0) {
2005 if (!full_base)
2006 return 0;
2007 upstream_is_gone = 1;
2008 }
2009
2010 base = shorten_unambiguous_ref(full_base, 0);
2011 if (upstream_is_gone) {
2012 strbuf_addf(sb,
2013 _("Your branch is based on '%s', but the upstream is gone.\n"),
2014 base);
2015 if (advice_status_hints)
2016 strbuf_addstr(sb,
2017 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2018 } else if (!sti) {
2019 strbuf_addf(sb,
2020 _("Your branch is up to date with '%s'.\n"),
2021 base);
2022 } else if (abf == AHEAD_BEHIND_QUICK) {
2023 strbuf_addf(sb,
2024 _("Your branch and '%s' refer to different commits.\n"),
2025 base);
2026 if (advice_status_hints)
2027 strbuf_addf(sb, _(" (use \"%s\" for details)\n"),
2028 "git status --ahead-behind");
2029 } else if (!theirs) {
2030 strbuf_addf(sb,
2031 Q_("Your branch is ahead of '%s' by %d commit.\n",
2032 "Your branch is ahead of '%s' by %d commits.\n",
2033 ours),
2034 base, ours);
2035 if (advice_status_hints)
2036 strbuf_addstr(sb,
2037 _(" (use \"git push\" to publish your local commits)\n"));
2038 } else if (!ours) {
2039 strbuf_addf(sb,
2040 Q_("Your branch is behind '%s' by %d commit, "
2041 "and can be fast-forwarded.\n",
2042 "Your branch is behind '%s' by %d commits, "
2043 "and can be fast-forwarded.\n",
2044 theirs),
2045 base, theirs);
2046 if (advice_status_hints)
2047 strbuf_addstr(sb,
2048 _(" (use \"git pull\" to update your local branch)\n"));
2049 } else {
2050 strbuf_addf(sb,
2051 Q_("Your branch and '%s' have diverged,\n"
2052 "and have %d and %d different commit each, "
2053 "respectively.\n",
2054 "Your branch and '%s' have diverged,\n"
2055 "and have %d and %d different commits each, "
2056 "respectively.\n",
2057 ours + theirs),
2058 base, ours, theirs);
2059 if (advice_status_hints)
2060 strbuf_addstr(sb,
2061 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2062 }
2063 free(base);
2064 return 1;
2065 }
2066
2067 static int one_local_ref(const char *refname, const struct object_id *oid,
2068 int flag, void *cb_data)
2069 {
2070 struct ref ***local_tail = cb_data;
2071 struct ref *ref;
2072
2073 /* we already know it starts with refs/ to get here */
2074 if (check_refname_format(refname + 5, 0))
2075 return 0;
2076
2077 ref = alloc_ref(refname);
2078 oidcpy(&ref->new_oid, oid);
2079 **local_tail = ref;
2080 *local_tail = &ref->next;
2081 return 0;
2082 }
2083
2084 struct ref *get_local_heads(void)
2085 {
2086 struct ref *local_refs = NULL, **local_tail = &local_refs;
2087
2088 for_each_ref(one_local_ref, &local_tail);
2089 return local_refs;
2090 }
2091
2092 struct ref *guess_remote_head(const struct ref *head,
2093 const struct ref *refs,
2094 int all)
2095 {
2096 const struct ref *r;
2097 struct ref *list = NULL;
2098 struct ref **tail = &list;
2099
2100 if (!head)
2101 return NULL;
2102
2103 /*
2104 * Some transports support directly peeking at
2105 * where HEAD points; if that is the case, then
2106 * we don't have to guess.
2107 */
2108 if (head->symref)
2109 return copy_ref(find_ref_by_name(refs, head->symref));
2110
2111 /* If refs/heads/master could be right, it is. */
2112 if (!all) {
2113 r = find_ref_by_name(refs, "refs/heads/master");
2114 if (r && oideq(&r->old_oid, &head->old_oid))
2115 return copy_ref(r);
2116 }
2117
2118 /* Look for another ref that points there */
2119 for (r = refs; r; r = r->next) {
2120 if (r != head &&
2121 starts_with(r->name, "refs/heads/") &&
2122 oideq(&r->old_oid, &head->old_oid)) {
2123 *tail = copy_ref(r);
2124 tail = &((*tail)->next);
2125 if (!all)
2126 break;
2127 }
2128 }
2129
2130 return list;
2131 }
2132
2133 struct stale_heads_info {
2134 struct string_list *ref_names;
2135 struct ref **stale_refs_tail;
2136 struct refspec *rs;
2137 };
2138
2139 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2140 int flags, void *cb_data)
2141 {
2142 struct stale_heads_info *info = cb_data;
2143 struct string_list matches = STRING_LIST_INIT_DUP;
2144 struct refspec_item query;
2145 int i, stale = 1;
2146 memset(&query, 0, sizeof(struct refspec_item));
2147 query.dst = (char *)refname;
2148
2149 query_refspecs_multiple(info->rs, &query, &matches);
2150 if (matches.nr == 0)
2151 goto clean_exit; /* No matches */
2152
2153 /*
2154 * If we did find a suitable refspec and it's not a symref and
2155 * it's not in the list of refs that currently exist in that
2156 * remote, we consider it to be stale. In order to deal with
2157 * overlapping refspecs, we need to go over all of the
2158 * matching refs.
2159 */
2160 if (flags & REF_ISSYMREF)
2161 goto clean_exit;
2162
2163 for (i = 0; stale && i < matches.nr; i++)
2164 if (string_list_has_string(info->ref_names, matches.items[i].string))
2165 stale = 0;
2166
2167 if (stale) {
2168 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2169 oidcpy(&ref->new_oid, oid);
2170 }
2171
2172 clean_exit:
2173 string_list_clear(&matches, 0);
2174 return 0;
2175 }
2176
2177 struct ref *get_stale_heads(struct refspec *rs, struct ref *fetch_map)
2178 {
2179 struct ref *ref, *stale_refs = NULL;
2180 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2181 struct stale_heads_info info;
2182
2183 info.ref_names = &ref_names;
2184 info.stale_refs_tail = &stale_refs;
2185 info.rs = rs;
2186 for (ref = fetch_map; ref; ref = ref->next)
2187 string_list_append(&ref_names, ref->name);
2188 string_list_sort(&ref_names);
2189 for_each_ref(get_stale_heads_cb, &info);
2190 string_list_clear(&ref_names, 0);
2191 return stale_refs;
2192 }
2193
2194 /*
2195 * Compare-and-swap
2196 */
2197 static void clear_cas_option(struct push_cas_option *cas)
2198 {
2199 int i;
2200
2201 for (i = 0; i < cas->nr; i++)
2202 free(cas->entry[i].refname);
2203 free(cas->entry);
2204 memset(cas, 0, sizeof(*cas));
2205 }
2206
2207 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2208 const char *refname,
2209 size_t refnamelen)
2210 {
2211 struct push_cas *entry;
2212 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2213 entry = &cas->entry[cas->nr++];
2214 memset(entry, 0, sizeof(*entry));
2215 entry->refname = xmemdupz(refname, refnamelen);
2216 return entry;
2217 }
2218
2219 static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2220 {
2221 const char *colon;
2222 struct push_cas *entry;
2223
2224 if (unset) {
2225 /* "--no-<option>" */
2226 clear_cas_option(cas);
2227 return 0;
2228 }
2229
2230 if (!arg) {
2231 /* just "--<option>" */
2232 cas->use_tracking_for_rest = 1;
2233 return 0;
2234 }
2235
2236 /* "--<option>=refname" or "--<option>=refname:value" */
2237 colon = strchrnul(arg, ':');
2238 entry = add_cas_entry(cas, arg, colon - arg);
2239 if (!*colon)
2240 entry->use_tracking = 1;
2241 else if (!colon[1])
2242 oidclr(&entry->expect);
2243 else if (get_oid(colon + 1, &entry->expect))
2244 return error(_("cannot parse expected object name '%s'"),
2245 colon + 1);
2246 return 0;
2247 }
2248
2249 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2250 {
2251 return parse_push_cas_option(opt->value, arg, unset);
2252 }
2253
2254 int is_empty_cas(const struct push_cas_option *cas)
2255 {
2256 return !cas->use_tracking_for_rest && !cas->nr;
2257 }
2258
2259 /*
2260 * Look at remote.fetch refspec and see if we have a remote
2261 * tracking branch for the refname there. Fill its current
2262 * value in sha1[].
2263 * If we cannot do so, return negative to signal an error.
2264 */
2265 static int remote_tracking(struct remote *remote, const char *refname,
2266 struct object_id *oid)
2267 {
2268 char *dst;
2269
2270 dst = apply_refspecs(&remote->fetch, refname);
2271 if (!dst)
2272 return -1; /* no tracking ref for refname at remote */
2273 if (read_ref(dst, oid))
2274 return -1; /* we know what the tracking ref is but we cannot read it */
2275 return 0;
2276 }
2277
2278 static void apply_cas(struct push_cas_option *cas,
2279 struct remote *remote,
2280 struct ref *ref)
2281 {
2282 int i;
2283
2284 /* Find an explicit --<option>=<name>[:<value>] entry */
2285 for (i = 0; i < cas->nr; i++) {
2286 struct push_cas *entry = &cas->entry[i];
2287 if (!refname_match(entry->refname, ref->name))
2288 continue;
2289 ref->expect_old_sha1 = 1;
2290 if (!entry->use_tracking)
2291 oidcpy(&ref->old_oid_expect, &entry->expect);
2292 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2293 oidclr(&ref->old_oid_expect);
2294 return;
2295 }
2296
2297 /* Are we using "--<option>" to cover all? */
2298 if (!cas->use_tracking_for_rest)
2299 return;
2300
2301 ref->expect_old_sha1 = 1;
2302 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2303 oidclr(&ref->old_oid_expect);
2304 }
2305
2306 void apply_push_cas(struct push_cas_option *cas,
2307 struct remote *remote,
2308 struct ref *remote_refs)
2309 {
2310 struct ref *ref;
2311 for (ref = remote_refs; ref; ref = ref->next)
2312 apply_cas(cas, remote, ref);
2313 }
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