1#include "cache.h"
2#include "config.h"
3#include "remote.h"
4#include "refs.h"
5#include "refspec.h"
6#include "commit.h"
7#include "diff.h"
8#include "revision.h"
9#include "dir.h"
10#include "tag.h"
11#include "string-list.h"
12#include "mergesort.h"
13#include "argv-array.h"
14enum map_direction { FROM_SRC, FROM_DST };
16struct counted_string {
18 size_t len;
19 const char *s;
20};
21struct rewrite {
22 const char *base;
23 size_t baselen;
24 struct counted_string *instead_of;
25 int instead_of_nr;
26 int instead_of_alloc;
27};
28struct rewrites {
29 struct rewrite **rewrite;
30 int rewrite_alloc;
31 int rewrite_nr;
32};
33static struct remote **remotes;
35static int remotes_alloc;
36static int remotes_nr;
37static struct hashmap remotes_hash;
38static struct branch **branches;
40static int branches_alloc;
41static int branches_nr;
42static struct branch *current_branch;
44static const char *pushremote_name;
45static struct rewrites rewrites;
47static struct rewrites rewrites_push;
48static int valid_remote(const struct remote *remote)
50{
51 return (!!remote->url) || (!!remote->foreign_vcs);
52}
53static const char *alias_url(const char *url, struct rewrites *r)
55{
56 int i, j;
57 struct counted_string *longest;
58 int longest_i;
59 longest = NULL;
61 longest_i = -1;
62 for (i = 0; i < r->rewrite_nr; i++) {
63 if (!r->rewrite[i])
64 continue;
65 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
66 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
67 (!longest ||
68 longest->len < r->rewrite[i]->instead_of[j].len)) {
69 longest = &(r->rewrite[i]->instead_of[j]);
70 longest_i = i;
71 }
72 }
73 }
74 if (!longest)
75 return url;
76 return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
78}
79static void add_url(struct remote *remote, const char *url)
81{
82 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
83 remote->url[remote->url_nr++] = url;
84}
85static void add_pushurl(struct remote *remote, const char *pushurl)
87{
88 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
89 remote->pushurl[remote->pushurl_nr++] = pushurl;
90}
91static void add_pushurl_alias(struct remote *remote, const char *url)
93{
94 const char *pushurl = alias_url(url, &rewrites_push);
95 if (pushurl != url)
96 add_pushurl(remote, pushurl);
97}
98static void add_url_alias(struct remote *remote, const char *url)
100{
101 add_url(remote, alias_url(url, &rewrites));
102 add_pushurl_alias(remote, url);
103}
104struct remotes_hash_key {
106 const char *str;
107 int len;
108};
109static int remotes_hash_cmp(const void *unused_cmp_data,
111 const void *entry,
112 const void *entry_or_key,
113 const void *keydata)
114{
115 const struct remote *a = entry;
116 const struct remote *b = entry_or_key;
117 const struct remotes_hash_key *key = keydata;
118 if (key)
120 return strncmp(a->name, key->str, key->len) || a->name[key->len];
121 else
122 return strcmp(a->name, b->name);
123}
124static inline void init_remotes_hash(void)
126{
127 if (!remotes_hash.cmpfn)
128 hashmap_init(&remotes_hash, remotes_hash_cmp, NULL, 0);
129}
130static struct remote *make_remote(const char *name, int len)
132{
133 struct remote *ret, *replaced;
134 struct remotes_hash_key lookup;
135 struct hashmap_entry lookup_entry;
136 if (!len)
138 len = strlen(name);
139 init_remotes_hash();
141 lookup.str = name;
142 lookup.len = len;
143 hashmap_entry_init(&lookup_entry, memhash(name, len));
144 if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
146 return ret;
147 ret = xcalloc(1, sizeof(struct remote));
149 ret->prune = -1; /* unspecified */
150 ret->prune_tags = -1; /* unspecified */
151 ret->name = xstrndup(name, len);
152 refspec_init(&ret->push, REFSPEC_PUSH);
153 refspec_init(&ret->fetch, REFSPEC_FETCH);
154 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
156 remotes[remotes_nr++] = ret;
157 hashmap_entry_init(ret, lookup_entry.hash);
159 replaced = hashmap_put(&remotes_hash, ret);
160 assert(replaced == NULL); /* no previous entry overwritten */
161 return ret;
162}
163static void add_merge(struct branch *branch, const char *name)
165{
166 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
167 branch->merge_alloc);
168 branch->merge_name[branch->merge_nr++] = name;
169}
170static struct branch *make_branch(const char *name, int len)
172{
173 struct branch *ret;
174 int i;
175 for (i = 0; i < branches_nr; i++) {
177 if (len ? (!strncmp(name, branches[i]->name, len) &&
178 !branches[i]->name[len]) :
179 !strcmp(name, branches[i]->name))
180 return branches[i];
181 }
182 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
184 ret = xcalloc(1, sizeof(struct branch));
185 branches[branches_nr++] = ret;
186 if (len)
187 ret->name = xstrndup(name, len);
188 else
189 ret->name = xstrdup(name);
190 ret->refname = xstrfmt("refs/heads/%s", ret->name);
191 return ret;
193}
194static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
196{
197 struct rewrite *ret;
198 int i;
199 for (i = 0; i < r->rewrite_nr; i++) {
201 if (len
202 ? (len == r->rewrite[i]->baselen &&
203 !strncmp(base, r->rewrite[i]->base, len))
204 : !strcmp(base, r->rewrite[i]->base))
205 return r->rewrite[i];
206 }
207 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
209 ret = xcalloc(1, sizeof(struct rewrite));
210 r->rewrite[r->rewrite_nr++] = ret;
211 if (len) {
212 ret->base = xstrndup(base, len);
213 ret->baselen = len;
214 }
215 else {
216 ret->base = xstrdup(base);
217 ret->baselen = strlen(base);
218 }
219 return ret;
220}
221static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
223{
224 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
225 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
226 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
227 rewrite->instead_of_nr++;
228}
229static const char *skip_spaces(const char *s)
231{
232 while (isspace(*s))
233 s++;
234 return s;
235}
236static void read_remotes_file(struct remote *remote)
238{
239 struct strbuf buf = STRBUF_INIT;
240 FILE *f = fopen_or_warn(git_path("remotes/%s", remote->name), "r");
241 if (!f)
243 return;
244 remote->configured_in_repo = 1;
245 remote->origin = REMOTE_REMOTES;
246 while (strbuf_getline(&buf, f) != EOF) {
247 const char *v;
248 strbuf_rtrim(&buf);
250 if (skip_prefix(buf.buf, "URL:", &v))
252 add_url_alias(remote, xstrdup(skip_spaces(v)));
253 else if (skip_prefix(buf.buf, "Push:", &v))
254 refspec_append(&remote->push, skip_spaces(v));
255 else if (skip_prefix(buf.buf, "Pull:", &v))
256 refspec_append(&remote->fetch, skip_spaces(v));
257 }
258 strbuf_release(&buf);
259 fclose(f);
260}
261static void read_branches_file(struct remote *remote)
263{
264 char *frag;
265 struct strbuf buf = STRBUF_INIT;
266 FILE *f = fopen_or_warn(git_path("branches/%s", remote->name), "r");
267 if (!f)
269 return;
270 strbuf_getline_lf(&buf, f);
272 fclose(f);
273 strbuf_trim(&buf);
274 if (!buf.len) {
275 strbuf_release(&buf);
276 return;
277 }
278 remote->configured_in_repo = 1;
280 remote->origin = REMOTE_BRANCHES;
281 /*
283 * The branches file would have URL and optionally
284 * #branch specified. The "master" (or specified) branch is
285 * fetched and stored in the local branch matching the
286 * remote name.
287 */
288 frag = strchr(buf.buf, '#');
289 if (frag)
290 *(frag++) = '\0';
291 else
292 frag = "master";
293 add_url_alias(remote, strbuf_detach(&buf, NULL));
295 strbuf_addf(&buf, "refs/heads/%s:refs/heads/%s",
296 frag, remote->name);
297 refspec_append(&remote->fetch, buf.buf);
298 /*
300 * Cogito compatible push: push current HEAD to remote #branch
301 * (master if missing)
302 */
303 strbuf_reset(&buf);
304 strbuf_addf(&buf, "HEAD:refs/heads/%s", frag);
305 refspec_append(&remote->push, buf.buf);
306 remote->fetch_tags = 1; /* always auto-follow */
307 strbuf_release(&buf);
308}
309static int handle_config(const char *key, const char *value, void *cb)
311{
312 const char *name;
313 int namelen;
314 const char *subkey;
315 struct remote *remote;
316 struct branch *branch;
317 if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
318 if (!name)
319 return 0;
320 branch = make_branch(name, namelen);
321 if (!strcmp(subkey, "remote")) {
322 return git_config_string(&branch->remote_name, key, value);
323 } else if (!strcmp(subkey, "pushremote")) {
324 return git_config_string(&branch->pushremote_name, key, value);
325 } else if (!strcmp(subkey, "merge")) {
326 if (!value)
327 return config_error_nonbool(key);
328 add_merge(branch, xstrdup(value));
329 }
330 return 0;
331 }
332 if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
333 struct rewrite *rewrite;
334 if (!name)
335 return 0;
336 if (!strcmp(subkey, "insteadof")) {
337 rewrite = make_rewrite(&rewrites, name, namelen);
338 if (!value)
339 return config_error_nonbool(key);
340 add_instead_of(rewrite, xstrdup(value));
341 } else if (!strcmp(subkey, "pushinsteadof")) {
342 rewrite = make_rewrite(&rewrites_push, name, namelen);
343 if (!value)
344 return config_error_nonbool(key);
345 add_instead_of(rewrite, xstrdup(value));
346 }
347 }
348 if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
350 return 0;
351 /* Handle remote.* variables */
353 if (!name && !strcmp(subkey, "pushdefault"))
354 return git_config_string(&pushremote_name, key, value);
355 if (!name)
357 return 0;
358 /* Handle remote.<name>.* variables */
359 if (*name == '/') {
360 warning("Config remote shorthand cannot begin with '/': %s",
361 name);
362 return 0;
363 }
364 remote = make_remote(name, namelen);
365 remote->origin = REMOTE_CONFIG;
366 if (current_config_scope() == CONFIG_SCOPE_REPO)
367 remote->configured_in_repo = 1;
368 if (!strcmp(subkey, "mirror"))
369 remote->mirror = git_config_bool(key, value);
370 else if (!strcmp(subkey, "skipdefaultupdate"))
371 remote->skip_default_update = git_config_bool(key, value);
372 else if (!strcmp(subkey, "skipfetchall"))
373 remote->skip_default_update = git_config_bool(key, value);
374 else if (!strcmp(subkey, "prune"))
375 remote->prune = git_config_bool(key, value);
376 else if (!strcmp(subkey, "prunetags"))
377 remote->prune_tags = git_config_bool(key, value);
378 else if (!strcmp(subkey, "url")) {
379 const char *v;
380 if (git_config_string(&v, key, value))
381 return -1;
382 add_url(remote, v);
383 } else if (!strcmp(subkey, "pushurl")) {
384 const char *v;
385 if (git_config_string(&v, key, value))
386 return -1;
387 add_pushurl(remote, v);
388 } else if (!strcmp(subkey, "push")) {
389 const char *v;
390 if (git_config_string(&v, key, value))
391 return -1;
392 refspec_append(&remote->push, v);
393 free((char *)v);
394 } else if (!strcmp(subkey, "fetch")) {
395 const char *v;
396 if (git_config_string(&v, key, value))
397 return -1;
398 refspec_append(&remote->fetch, v);
399 free((char *)v);
400 } else if (!strcmp(subkey, "receivepack")) {
401 const char *v;
402 if (git_config_string(&v, key, value))
403 return -1;
404 if (!remote->receivepack)
405 remote->receivepack = v;
406 else
407 error("more than one receivepack given, using the first");
408 } else if (!strcmp(subkey, "uploadpack")) {
409 const char *v;
410 if (git_config_string(&v, key, value))
411 return -1;
412 if (!remote->uploadpack)
413 remote->uploadpack = v;
414 else
415 error("more than one uploadpack given, using the first");
416 } else if (!strcmp(subkey, "tagopt")) {
417 if (!strcmp(value, "--no-tags"))
418 remote->fetch_tags = -1;
419 else if (!strcmp(value, "--tags"))
420 remote->fetch_tags = 2;
421 } else if (!strcmp(subkey, "proxy")) {
422 return git_config_string((const char **)&remote->http_proxy,
423 key, value);
424 } else if (!strcmp(subkey, "proxyauthmethod")) {
425 return git_config_string((const char **)&remote->http_proxy_authmethod,
426 key, value);
427 } else if (!strcmp(subkey, "vcs")) {
428 return git_config_string(&remote->foreign_vcs, key, value);
429 }
430 return 0;
431}
432static void alias_all_urls(void)
434{
435 int i, j;
436 for (i = 0; i < remotes_nr; i++) {
437 int add_pushurl_aliases;
438 if (!remotes[i])
439 continue;
440 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
441 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
442 }
443 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
444 for (j = 0; j < remotes[i]->url_nr; j++) {
445 if (add_pushurl_aliases)
446 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
447 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
448 }
449 }
450}
451static void read_config(void)
453{
454 static int loaded;
455 int flag;
456 if (loaded)
458 return;
459 loaded = 1;
460 current_branch = NULL;
462 if (startup_info->have_repository) {
463 const char *head_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flag);
464 if (head_ref && (flag & REF_ISSYMREF) &&
465 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
466 current_branch = make_branch(head_ref, 0);
467 }
468 }
469 git_config(handle_config, NULL);
470 alias_all_urls();
471}
472static int valid_remote_nick(const char *name)
474{
475 if (!name[0] || is_dot_or_dotdot(name))
476 return 0;
477 /* remote nicknames cannot contain slashes */
479 while (*name)
480 if (is_dir_sep(*name++))
481 return 0;
482 return 1;
483}
484const char *remote_for_branch(struct branch *branch, int *explicit)
486{
487 if (branch && branch->remote_name) {
488 if (explicit)
489 *explicit = 1;
490 return branch->remote_name;
491 }
492 if (explicit)
493 *explicit = 0;
494 return "origin";
495}
496const char *pushremote_for_branch(struct branch *branch, int *explicit)
498{
499 if (branch && branch->pushremote_name) {
500 if (explicit)
501 *explicit = 1;
502 return branch->pushremote_name;
503 }
504 if (pushremote_name) {
505 if (explicit)
506 *explicit = 1;
507 return pushremote_name;
508 }
509 return remote_for_branch(branch, explicit);
510}
511const char *remote_ref_for_branch(struct branch *branch, int for_push,
513 int *explicit)
514{
515 if (branch) {
516 if (!for_push) {
517 if (branch->merge_nr) {
518 if (explicit)
519 *explicit = 1;
520 return branch->merge_name[0];
521 }
522 } else {
523 const char *dst, *remote_name =
524 pushremote_for_branch(branch, NULL);
525 struct remote *remote = remote_get(remote_name);
526 if (remote && remote->push.nr &&
528 (dst = apply_refspecs(&remote->push,
529 branch->refname))) {
530 if (explicit)
531 *explicit = 1;
532 return dst;
533 }
534 }
535 }
536 if (explicit)
537 *explicit = 0;
538 return "";
539}
540static 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 read_config();
548 if (name)
550 name_given = 1;
551 else
552 name = get_default(current_branch, &name_given);
553 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}
567struct remote *remote_get(const char *name)
569{
570 return remote_get_1(name, remote_for_branch);
571}
572struct remote *pushremote_get(const char *name)
574{
575 return remote_get_1(name, pushremote_for_branch);
576}
577int 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}
586int 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}
599static 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 die(_("Internal error"));
622 }
623 }
624 free(ref2->peer_ref);
625 free(ref2);
626}
627struct 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 while (ref_map) {
635 struct ref *ref = ref_map;
636 ref_map = ref_map->next;
638 ref->next = NULL;
639 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 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 string_list_clear(&refs, 0);
659 return retval;
660}
661int 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}
671static 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}
699static 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 if (find_src && !query->dst)
708 error("query_refspecs_multiple: need either src or dst");
709 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 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}
727int 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 if (find_src && !query->dst)
736 return error("query_refspecs: need either src or dst");
737 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 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}
758char *apply_refspecs(struct refspec *rs, const char *name)
760{
761 struct refspec_item query;
762 memset(&query, 0, sizeof(struct refspec_item));
764 query.src = (char *)name;
765 if (query_refspecs(rs, &query))
767 return NULL;
768 return query.dst;
770}
771int remote_find_tracking(struct remote *remote, struct refspec_item *refspec)
773{
774 return query_refspecs(&remote->fetch, refspec);
775}
776static 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}
786struct ref *alloc_ref(const char *name)
788{
789 return alloc_ref_with_prefix("", 0, name);
790}
791struct 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}
807struct 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}
819static void free_ref(struct ref *ref)
821{
822 if (!ref)
823 return;
824 free_ref(ref->peer_ref);
825 free(ref->remote_status);
826 free(ref->symref);
827 free(ref);
828}
829void free_refs(struct ref *ref)
831{
832 struct ref *next;
833 while (ref) {
834 next = ref->next;
835 free_ref(ref);
836 ref = next;
837 }
838}
839int 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}
845static void *ref_list_get_next(const void *a)
847{
848 return ((const struct ref *)a)->next;
849}
850static void ref_list_set_next(void *a, void *next)
852{
853 ((struct ref *)a)->next = next;
854}
855void 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}
860int 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 for (weak_match = match = 0; refs; refs = refs->next) {
872 char *name = refs->name;
873 int namelen = strlen(name);
874 if (!refname_match(pattern, name))
876 continue;
877 /* 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}
916static 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}
924static struct ref *alloc_delete_ref(void)
926{
927 struct ref *ref = alloc_ref("(delete)");
928 oidclr(&ref->new_oid);
929 return ref;
930}
931static int try_explicit_object_name(const char *name,
933 struct ref **match)
934{
935 struct object_id oid;
936 if (!*name) {
938 if (match)
939 *match = alloc_delete_ref();
940 return 0;
941 }
942 if (get_oid(name, &oid))
944 return -1;
945 if (match) {
947 *match = alloc_ref(name);
948 oidcpy(&(*match)->new_oid, &oid);
949 }
950 return 0;
951}
952static 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}
959static char *guess_ref(const char *name, struct ref *peer)
961{
962 struct strbuf buf = STRBUF_INIT;
963 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
965 NULL, NULL);
966 if (!r)
967 return NULL;
968 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 strbuf_addstr(&buf, name);
977 return strbuf_detach(&buf, NULL);
978}
979static int match_explicit_lhs(struct ref *src,
981 struct refspec_item *rs,
982 struct ref **match,
983 int *allocated_match)
984{
985 switch (count_refspec_match(rs->src, src, match)) {
986 case 1:
987 if (allocated_match)
988 *allocated_match = 0;
989 return 0;
990 case 0:
991 /* The source could be in the get_sha1() format
992 * not a reference name. :refs/other is a
993 * way to delete 'other' ref at the remote end.
994 */
995 if (try_explicit_object_name(rs->src, match) < 0)
996 return error("src refspec %s does not match any.", rs->src);
997 if (allocated_match)
998 *allocated_match = 1;
999 return 0;
1000 default:
1001 return error("src refspec %s matches more than one.", rs->src);
1002 }
1003}
1004static int match_explicit(struct ref *src, struct ref *dst,
1006 struct ref ***dst_tail,
1007 struct refspec_item *rs)
1008{
1009 struct ref *matched_src, *matched_dst;
1010 int allocated_src;
1011 const char *dst_value = rs->dst;
1013 char *dst_guess;
1014 if (rs->pattern || rs->matching)
1016 return 0;
1017 matched_src = matched_dst = NULL;
1019 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1020 return -1;
1021 if (!dst_value) {
1023 int flag;
1024 dst_value = resolve_ref_unsafe(matched_src->name,
1026 RESOLVE_REF_READING,
1027 NULL, &flag);
1028 if (!dst_value ||
1029 ((flag & REF_ISSYMREF) &&
1030 !starts_with(dst_value, "refs/heads/")))
1031 die("%s cannot be resolved to branch.",
1032 matched_src->name);
1033 }
1034 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1036 case 1:
1037 break;
1038 case 0:
1039 if (starts_with(dst_value, "refs/"))
1040 matched_dst = make_linked_ref(dst_value, dst_tail);
1041 else if (is_null_oid(&matched_src->new_oid))
1042 error("unable to delete '%s': remote ref does not exist",
1043 dst_value);
1044 else if ((dst_guess = guess_ref(dst_value, matched_src))) {
1045 matched_dst = make_linked_ref(dst_guess, dst_tail);
1046 free(dst_guess);
1047 } else
1048 error("unable to push to unqualified destination: %s\n"
1049 "The destination refspec neither matches an "
1050 "existing ref on the remote nor\n"
1051 "begins with refs/, and we are unable to "
1052 "guess a prefix based on the source ref.",
1053 dst_value);
1054 break;
1055 default:
1056 matched_dst = NULL;
1057 error("dst refspec %s matches more than one.",
1058 dst_value);
1059 break;
1060 }
1061 if (!matched_dst)
1062 return -1;
1063 if (matched_dst->peer_ref)
1064 return error("dst ref %s receives from more than one src.",
1065 matched_dst->name);
1066 else {
1067 matched_dst->peer_ref = allocated_src ?
1068 matched_src :
1069 copy_ref(matched_src);
1070 matched_dst->force = rs->force;
1071 }
1072 return 0;
1073}
1074static int match_explicit_refs(struct ref *src, struct ref *dst,
1076 struct ref ***dst_tail, struct refspec *rs)
1077{
1078 int i, errs;
1079 for (i = errs = 0; i < rs->nr; i++)
1080 errs += match_explicit(src, dst, dst_tail, &rs->items[i]);
1081 return errs;
1082}
1083static char *get_ref_match(const struct refspec *rs, const struct ref *ref,
1085 int send_mirror, int direction,
1086 const struct refspec_item **ret_pat)
1087{
1088 const struct refspec_item *pat;
1089 char *name;
1090 int i;
1091 int matching_refs = -1;
1092 for (i = 0; i < rs->nr; i++) {
1093 const struct refspec_item *item = &rs->items[i];
1094 if (item->matching &&
1095 (matching_refs == -1 || item->force)) {
1096 matching_refs = i;
1097 continue;
1098 }
1099 if (item->pattern) {
1101 const char *dst_side = item->dst ? item->dst : item->src;
1102 int match;
1103 if (direction == FROM_SRC)
1104 match = match_name_with_pattern(item->src, ref->name, dst_side, &name);
1105 else
1106 match = match_name_with_pattern(dst_side, ref->name, item->src, &name);
1107 if (match) {
1108 matching_refs = i;
1109 break;
1110 }
1111 }
1112 }
1113 if (matching_refs == -1)
1114 return NULL;
1115 pat = &rs->items[matching_refs];
1117 if (pat->matching) {
1118 /*
1119 * "matching refs"; traditionally we pushed everything
1120 * including refs outside refs/heads/ hierarchy, but
1121 * that does not make much sense these days.
1122 */
1123 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1124 return NULL;
1125 name = xstrdup(ref->name);
1126 }
1127 if (ret_pat)
1128 *ret_pat = pat;
1129 return name;
1130}
1131static struct ref **tail_ref(struct ref **head)
1133{
1134 struct ref **tail = head;
1135 while (*tail)
1136 tail = &((*tail)->next);
1137 return tail;
1138}
1139struct tips {
1141 struct commit **tip;
1142 int nr, alloc;
1143};
1144static void add_to_tips(struct tips *tips, const struct object_id *oid)
1146{
1147 struct commit *commit;
1148 if (is_null_oid(oid))
1150 return;
1151 commit = lookup_commit_reference_gently(oid, 1);
1152 if (!commit || (commit->object.flags & TMP_MARK))
1153 return;
1154 commit->object.flags |= TMP_MARK;
1155 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1156 tips->tip[tips->nr++] = commit;
1157}
1158static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1160{
1161 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1162 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1163 struct string_list_item *item;
1164 struct ref *ref;
1165 struct tips sent_tips;
1166 /*
1168 * Collect everything we know they would have at the end of
1169 * this push, and collect all tags they have.
1170 */
1171 memset(&sent_tips, 0, sizeof(sent_tips));
1172 for (ref = *dst; ref; ref = ref->next) {
1173 if (ref->peer_ref &&
1174 !is_null_oid(&ref->peer_ref->new_oid))
1175 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1176 else
1177 add_to_tips(&sent_tips, &ref->old_oid);
1178 if (starts_with(ref->name, "refs/tags/"))
1179 string_list_append(&dst_tag, ref->name);
1180 }
1181 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1182 string_list_sort(&dst_tag);
1184 /* Collect tags they do not have. */
1186 for (ref = src; ref; ref = ref->next) {
1187 if (!starts_with(ref->name, "refs/tags/"))
1188 continue; /* not a tag */
1189 if (string_list_has_string(&dst_tag, ref->name))
1190 continue; /* they already have it */
1191 if (oid_object_info(the_repository, &ref->new_oid, NULL) != OBJ_TAG)
1192 continue; /* be conservative */
1193 item = string_list_append(&src_tag, ref->name);
1194 item->util = ref;
1195 }
1196 string_list_clear(&dst_tag, 0);
1197 /*
1199 * At this point, src_tag lists tags that are missing from
1200 * dst, and sent_tips lists the tips we are pushing or those
1201 * that we know they already have. An element in the src_tag
1202 * that is an ancestor of any of the sent_tips needs to be
1203 * sent to the other side.
1204 */
1205 if (sent_tips.nr) {
1206 for_each_string_list_item(item, &src_tag) {
1207 struct ref *ref = item->util;
1208 struct ref *dst_ref;
1209 struct commit *commit;
1210 if (is_null_oid(&ref->new_oid))
1212 continue;
1213 commit = lookup_commit_reference_gently(&ref->new_oid,
1214 1);
1215 if (!commit)
1216 /* not pushing a commit, which is not an error */
1217 continue;
1218 /*
1220 * Is this tag, which they do not have, reachable from
1221 * any of the commits we are sending?
1222 */
1223 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1224 continue;
1225 /* Add it in */
1227 dst_ref = make_linked_ref(ref->name, dst_tail);
1228 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1229 dst_ref->peer_ref = copy_ref(ref);
1230 }
1231 }
1232 string_list_clear(&src_tag, 0);
1233 free(sent_tips.tip);
1234}
1235struct ref *find_ref_by_name(const struct ref *list, const char *name)
1237{
1238 for ( ; list; list = list->next)
1239 if (!strcmp(list->name, name))
1240 return (struct ref *)list;
1241 return NULL;
1242}
1243static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1245{
1246 for ( ; ref; ref = ref->next)
1247 string_list_append_nodup(ref_index, ref->name)->util = ref;
1248 string_list_sort(ref_index);
1250}
1251/*
1253 * Given only the set of local refs, sanity-check the set of push
1254 * refspecs. We can't catch all errors that match_push_refs would,
1255 * but we can catch some errors early before even talking to the
1256 * remote side.
1257 */
1258int check_push_refs(struct ref *src, struct refspec *rs)
1259{
1260 int ret = 0;
1261 int i;
1262 for (i = 0; i < rs->nr; i++) {
1264 struct refspec_item *item = &rs->items[i];
1265 if (item->pattern || item->matching)
1267 continue;
1268 ret |= match_explicit_lhs(src, item, NULL, NULL);
1270 }
1271 return ret;
1273}
1274/*
1276 * Given the set of refs the local repository has, the set of refs the
1277 * remote repository has, and the refspec used for push, determine
1278 * what remote refs we will update and with what value by setting
1279 * peer_ref (which object is being pushed) and force (if the push is
1280 * forced) in elements of "dst". The function may add new elements to
1281 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1282 */
1283int match_push_refs(struct ref *src, struct ref **dst,
1284 struct refspec *rs, int flags)
1285{
1286 int send_all = flags & MATCH_REFS_ALL;
1287 int send_mirror = flags & MATCH_REFS_MIRROR;
1288 int send_prune = flags & MATCH_REFS_PRUNE;
1289 int errs;
1290 struct ref *ref, **dst_tail = tail_ref(dst);
1291 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1292 /* If no refspec is provided, use the default ":" */
1294 if (!rs->nr)
1295 refspec_append(rs, ":");
1296 errs = match_explicit_refs(src, *dst, &dst_tail, rs);
1298 /* pick the remainder */
1300 for (ref = src; ref; ref = ref->next) {
1301 struct string_list_item *dst_item;
1302 struct ref *dst_peer;
1303 const struct refspec_item *pat = NULL;
1304 char *dst_name;
1305 dst_name = get_ref_match(rs, ref, send_mirror, FROM_SRC, &pat);
1307 if (!dst_name)
1308 continue;
1309 if (!dst_ref_index.nr)
1311 prepare_ref_index(&dst_ref_index, *dst);
1312 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1314 dst_peer = dst_item ? dst_item->util : NULL;
1315 if (dst_peer) {
1316 if (dst_peer->peer_ref)
1317 /* We're already sending something to this ref. */
1318 goto free_name;
1319 } else {
1320 if (pat->matching && !(send_all || send_mirror))
1321 /*
1322 * Remote doesn't have it, and we have no
1323 * explicit pattern, and we don't have
1324 * --all or --mirror.
1325 */
1326 goto free_name;
1327 /* Create a new one and link it */
1329 dst_peer = make_linked_ref(dst_name, &dst_tail);
1330 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1331 string_list_insert(&dst_ref_index,
1332 dst_peer->name)->util = dst_peer;
1333 }
1334 dst_peer->peer_ref = copy_ref(ref);
1335 dst_peer->force = pat->force;
1336 free_name:
1337 free(dst_name);
1338 }
1339 string_list_clear(&dst_ref_index, 0);
1341 if (flags & MATCH_REFS_FOLLOW_TAGS)
1343 add_missing_tags(src, dst, &dst_tail);
1344 if (send_prune) {
1346 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1347 /* check for missing refs on the remote */
1348 for (ref = *dst; ref; ref = ref->next) {
1349 char *src_name;
1350 if (ref->peer_ref)
1352 /* We're already sending something to this ref. */
1353 continue;
1354 src_name = get_ref_match(rs, ref, send_mirror, FROM_DST, NULL);
1356 if (src_name) {
1357 if (!src_ref_index.nr)
1358 prepare_ref_index(&src_ref_index, src);
1359 if (!string_list_has_string(&src_ref_index,
1360 src_name))
1361 ref->peer_ref = alloc_delete_ref();
1362 free(src_name);
1363 }
1364 }
1365 string_list_clear(&src_ref_index, 0);
1366 }
1367 if (errs)
1369 return -1;
1370 return 0;
1371}
1372void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1374 int force_update)
1375{
1376 struct ref *ref;
1377 for (ref = remote_refs; ref; ref = ref->next) {
1379 int force_ref_update = ref->force || force_update;
1380 int reject_reason = 0;
1381 if (ref->peer_ref)
1383 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1384 else if (!send_mirror)
1385 continue;
1386 ref->deletion = is_null_oid(&ref->new_oid);
1388 if (!ref->deletion &&
1389 !oidcmp(&ref->old_oid, &ref->new_oid)) {
1390 ref->status = REF_STATUS_UPTODATE;
1391 continue;
1392 }
1393 /*
1395 * If the remote ref has moved and is now different
1396 * from what we expect, reject any push.
1397 *
1398 * It also is an error if the user told us to check
1399 * with the remote-tracking branch to find the value
1400 * to expect, but we did not have such a tracking
1401 * branch.
1402 */
1403 if (ref->expect_old_sha1) {
1404 if (oidcmp(&ref->old_oid, &ref->old_oid_expect))
1405 reject_reason = REF_STATUS_REJECT_STALE;
1406 else
1407 /* If the ref isn't stale then force the update. */
1408 force_ref_update = 1;
1409 }
1410 /*
1412 * If the update isn't already rejected then check
1413 * the usual "must fast-forward" rules.
1414 *
1415 * Decide whether an individual refspec A:B can be
1416 * pushed. The push will succeed if any of the
1417 * following are true:
1418 *
1419 * (1) the remote reference B does not exist
1420 *
1421 * (2) the remote reference B is being removed (i.e.,
1422 * pushing :B where no source is specified)
1423 *
1424 * (3) the destination is not under refs/tags/, and
1425 * if the old and new value is a commit, the new
1426 * is a descendant of the old.
1427 *
1428 * (4) it is forced using the +A:B notation, or by
1429 * passing the --force argument
1430 */
1431 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1433 if (starts_with(ref->name, "refs/tags/"))
1434 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1435 else if (!has_object_file(&ref->old_oid))
1436 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1437 else if (!lookup_commit_reference_gently(&ref->old_oid, 1) ||
1438 !lookup_commit_reference_gently(&ref->new_oid, 1))
1439 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1440 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1441 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1442 }
1443 /*
1445 * "--force" will defeat any rejection implemented
1446 * by the rules above.
1447 */
1448 if (!force_ref_update)
1449 ref->status = reject_reason;
1450 else if (reject_reason)
1451 ref->forced_update = 1;
1452 }
1453}
1454static void set_merge(struct branch *ret)
1456{
1457 struct remote *remote;
1458 char *ref;
1459 struct object_id oid;
1460 int i;
1461 if (!ret)
1463 return; /* no branch */
1464 if (ret->merge)
1465 return; /* already run */
1466 if (!ret->remote_name || !ret->merge_nr) {
1467 /*
1468 * no merge config; let's make sure we don't confuse callers
1469 * with a non-zero merge_nr but a NULL merge
1470 */
1471 ret->merge_nr = 0;
1472 return;
1473 }
1474 remote = remote_get(ret->remote_name);
1476 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1478 for (i = 0; i < ret->merge_nr; i++) {
1479 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1480 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1481 if (!remote_find_tracking(remote, ret->merge[i]) ||
1482 strcmp(ret->remote_name, "."))
1483 continue;
1484 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1485 &oid, &ref) == 1)
1486 ret->merge[i]->dst = ref;
1487 else
1488 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1489 }
1490}
1491struct branch *branch_get(const char *name)
1493{
1494 struct branch *ret;
1495 read_config();
1497 if (!name || !*name || !strcmp(name, "HEAD"))
1498 ret = current_branch;
1499 else
1500 ret = make_branch(name, 0);
1501 set_merge(ret);
1502 return ret;
1503}
1504int branch_has_merge_config(struct branch *branch)
1506{
1507 return branch && !!branch->merge;
1508}
1509int branch_merge_matches(struct branch *branch,
1511 int i,
1512 const char *refname)
1513{
1514 if (!branch || i < 0 || i >= branch->merge_nr)
1515 return 0;
1516 return refname_match(branch->merge[i]->src, refname);
1517}
1518__attribute__((format (printf,2,3)))
1520static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1521{
1522 if (err) {
1523 va_list ap;
1524 va_start(ap, fmt);
1525 strbuf_vaddf(err, fmt, ap);
1526 va_end(ap);
1527 }
1528 return NULL;
1529}
1530const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1532{
1533 if (!branch)
1534 return error_buf(err, _("HEAD does not point to a branch"));
1535 if (!branch->merge || !branch->merge[0]) {
1537 /*
1538 * no merge config; is it because the user didn't define any,
1539 * or because it is not a real branch, and get_branch
1540 * auto-vivified it?
1541 */
1542 if (!ref_exists(branch->refname))
1543 return error_buf(err, _("no such branch: '%s'"),
1544 branch->name);
1545 return error_buf(err,
1546 _("no upstream configured for branch '%s'"),
1547 branch->name);
1548 }
1549 if (!branch->merge[0]->dst)
1551 return error_buf(err,
1552 _("upstream branch '%s' not stored as a remote-tracking branch"),
1553 branch->merge[0]->src);
1554 return branch->merge[0]->dst;
1556}
1557static const char *tracking_for_push_dest(struct remote *remote,
1559 const char *refname,
1560 struct strbuf *err)
1561{
1562 char *ret;
1563 ret = apply_refspecs(&remote->fetch, refname);
1565 if (!ret)
1566 return error_buf(err,
1567 _("push destination '%s' on remote '%s' has no local tracking branch"),
1568 refname, remote->name);
1569 return ret;
1570}
1571static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1573{
1574 struct remote *remote;
1575 remote = remote_get(pushremote_for_branch(branch, NULL));
1577 if (!remote)
1578 return error_buf(err,
1579 _("branch '%s' has no remote for pushing"),
1580 branch->name);
1581 if (remote->push.nr) {
1583 char *dst;
1584 const char *ret;
1585 dst = apply_refspecs(&remote->push, branch->refname);
1587 if (!dst)
1588 return error_buf(err,
1589 _("push refspecs for '%s' do not include '%s'"),
1590 remote->name, branch->name);
1591 ret = tracking_for_push_dest(remote, dst, err);
1593 free(dst);
1594 return ret;
1595 }
1596 if (remote->mirror)
1598 return tracking_for_push_dest(remote, branch->refname, err);
1599 switch (push_default) {
1601 case PUSH_DEFAULT_NOTHING:
1602 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1603 case PUSH_DEFAULT_MATCHING:
1605 case PUSH_DEFAULT_CURRENT:
1606 return tracking_for_push_dest(remote, branch->refname, err);
1607 case PUSH_DEFAULT_UPSTREAM:
1609 return branch_get_upstream(branch, err);
1610 case PUSH_DEFAULT_UNSPECIFIED:
1612 case PUSH_DEFAULT_SIMPLE:
1613 {
1614 const char *up, *cur;
1615 up = branch_get_upstream(branch, err);
1617 if (!up)
1618 return NULL;
1619 cur = tracking_for_push_dest(remote, branch->refname, err);
1620 if (!cur)
1621 return NULL;
1622 if (strcmp(cur, up))
1623 return error_buf(err,
1624 _("cannot resolve 'simple' push to a single destination"));
1625 return cur;
1626 }
1627 }
1628 BUG("unhandled push situation");
1630}
1631const char *branch_get_push(struct branch *branch, struct strbuf *err)
1633{
1634 if (!branch)
1635 return error_buf(err, _("HEAD does not point to a branch"));
1636 if (!branch->push_tracking_ref)
1638 branch->push_tracking_ref = branch_get_push_1(branch, err);
1639 return branch->push_tracking_ref;
1640}
1641static int ignore_symref_update(const char *refname)
1643{
1644 int flag;
1645 if (!resolve_ref_unsafe(refname, 0, NULL, &flag))
1647 return 0; /* non-existing refs are OK */
1648 return (flag & REF_ISSYMREF);
1649}
1650/*
1652 * Create and return a list of (struct ref) consisting of copies of
1653 * each remote_ref that matches refspec. refspec must be a pattern.
1654 * Fill in the copies' peer_ref to describe the local tracking refs to
1655 * which they map. Omit any references that would map to an existing
1656 * local symbolic ref.
1657 */
1658static struct ref *get_expanded_map(const struct ref *remote_refs,
1659 const struct refspec_item *refspec)
1660{
1661 const struct ref *ref;
1662 struct ref *ret = NULL;
1663 struct ref **tail = &ret;
1664 for (ref = remote_refs; ref; ref = ref->next) {
1666 char *expn_name = NULL;
1667 if (strchr(ref->name, '^'))
1669 continue; /* a dereference item */
1670 if (match_name_with_pattern(refspec->src, ref->name,
1671 refspec->dst, &expn_name) &&
1672 !ignore_symref_update(expn_name)) {
1673 struct ref *cpy = copy_ref(ref);
1674 cpy->peer_ref = alloc_ref(expn_name);
1676 if (refspec->force)
1677 cpy->peer_ref->force = 1;
1678 *tail = cpy;
1679 tail = &cpy->next;
1680 }
1681 free(expn_name);
1682 }
1683 return ret;
1685}
1686static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1688{
1689 const struct ref *ref;
1690 for (ref = refs; ref; ref = ref->next) {
1691 if (refname_match(name, ref->name))
1692 return ref;
1693 }
1694 return NULL;
1695}
1696struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1698{
1699 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1700 if (!ref)
1702 return NULL;
1703 return copy_ref(ref);
1705}
1706static struct ref *get_local_ref(const char *name)
1708{
1709 if (!name || name[0] == '\0')
1710 return NULL;
1711 if (starts_with(name, "refs/"))
1713 return alloc_ref(name);
1714 if (starts_with(name, "heads/") ||
1716 starts_with(name, "tags/") ||
1717 starts_with(name, "remotes/"))
1718 return alloc_ref_with_prefix("refs/", 5, name);
1719 return alloc_ref_with_prefix("refs/heads/", 11, name);
1721}
1722int get_fetch_map(const struct ref *remote_refs,
1724 const struct refspec_item *refspec,
1725 struct ref ***tail,
1726 int missing_ok)
1727{
1728 struct ref *ref_map, **rmp;
1729 if (refspec->pattern) {
1731 ref_map = get_expanded_map(remote_refs, refspec);
1732 } else {
1733 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1734 if (refspec->exact_sha1) {
1736 ref_map = alloc_ref(name);
1737 get_oid_hex(name, &ref_map->old_oid);
1738 } else {
1739 ref_map = get_remote_ref(remote_refs, name);
1740 }
1741 if (!missing_ok && !ref_map)
1742 die("Couldn't find remote ref %s", name);
1743 if (ref_map) {
1744 ref_map->peer_ref = get_local_ref(refspec->dst);
1745 if (ref_map->peer_ref && refspec->force)
1746 ref_map->peer_ref->force = 1;
1747 }
1748 }
1749 for (rmp = &ref_map; *rmp; ) {
1751 if ((*rmp)->peer_ref) {
1752 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1753 check_refname_format((*rmp)->peer_ref->name, 0)) {
1754 struct ref *ignore = *rmp;
1755 error("* Ignoring funny ref '%s' locally",
1756 (*rmp)->peer_ref->name);
1757 *rmp = (*rmp)->next;
1758 free(ignore->peer_ref);
1759 free(ignore);
1760 continue;
1761 }
1762 }
1763 rmp = &((*rmp)->next);
1764 }
1765 if (ref_map)
1767 tail_link_ref(ref_map, tail);
1768 return 0;
1770}
1771int resolve_remote_symref(struct ref *ref, struct ref *list)
1773{
1774 if (!ref->symref)
1775 return 0;
1776 for (; list; list = list->next)
1777 if (!strcmp(ref->symref, list->name)) {
1778 oidcpy(&ref->old_oid, &list->old_oid);
1779 return 0;
1780 }
1781 return 1;
1782}
1783static void unmark_and_free(struct commit_list *list, unsigned int mark)
1785{
1786 while (list) {
1787 struct commit *commit = pop_commit(&list);
1788 commit->object.flags &= ~mark;
1789 }
1790}
1791int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
1793{
1794 struct object *o;
1795 struct commit *old_commit, *new_commit;
1796 struct commit_list *list, *used;
1797 int found = 0;
1798 /*
1800 * Both new_commit and old_commit must be commit-ish and new_commit is descendant of
1801 * old_commit. Otherwise we require --force.
1802 */
1803 o = deref_tag(parse_object(old_oid), NULL, 0);
1804 if (!o || o->type != OBJ_COMMIT)
1805 return 0;
1806 old_commit = (struct commit *) o;
1807 o = deref_tag(parse_object(new_oid), NULL, 0);
1809 if (!o || o->type != OBJ_COMMIT)
1810 return 0;
1811 new_commit = (struct commit *) o;
1812 if (parse_commit(new_commit) < 0)
1814 return 0;
1815 used = list = NULL;
1817 commit_list_insert(new_commit, &list);
1818 while (list) {
1819 new_commit = pop_most_recent_commit(&list, TMP_MARK);
1820 commit_list_insert(new_commit, &used);
1821 if (new_commit == old_commit) {
1822 found = 1;
1823 break;
1824 }
1825 }
1826 unmark_and_free(list, TMP_MARK);
1827 unmark_and_free(used, TMP_MARK);
1828 return found;
1829}
1830/*
1832 * Lookup the upstream branch for the given branch and if present, optionally
1833 * compute the commit ahead/behind values for the pair.
1834 *
1835 * If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
1836 * counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
1837 * the (potentially expensive) a/b computation (*num_ours and *num_theirs are
1838 * set to zero).
1839 *
1840 * The name of the upstream branch (or NULL if no upstream is defined) is
1841 * returned via *upstream_name, if it is not itself NULL.
1842 *
1843 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1844 * upstream defined, or ref does not exist). Returns 0 if the commits are
1845 * identical. Returns 1 if commits are different.
1846 */
1847int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1848 const char **upstream_name, enum ahead_behind_flags abf)
1849{
1850 struct object_id oid;
1851 struct commit *ours, *theirs;
1852 struct rev_info revs;
1853 const char *base;
1854 struct argv_array argv = ARGV_ARRAY_INIT;
1855 /* Cannot stat unless we are marked to build on top of somebody else. */
1857 base = branch_get_upstream(branch, NULL);
1858 if (upstream_name)
1859 *upstream_name = base;
1860 if (!base)
1861 return -1;
1862 /* Cannot stat if what we used to build on no longer exists */
1864 if (read_ref(base, &oid))
1865 return -1;
1866 theirs = lookup_commit_reference(&oid);
1867 if (!theirs)
1868 return -1;
1869 if (read_ref(branch->refname, &oid))
1871 return -1;
1872 ours = lookup_commit_reference(&oid);
1873 if (!ours)
1874 return -1;
1875 *num_theirs = *num_ours = 0;
1877 /* are we the same? */
1879 if (theirs == ours)
1880 return 0;
1881 if (abf == AHEAD_BEHIND_QUICK)
1882 return 1;
1883 if (abf != AHEAD_BEHIND_FULL)
1884 BUG("stat_tracking_info: invalid abf '%d'", abf);
1885 /* Run "rev-list --left-right ours...theirs" internally... */
1887 argv_array_push(&argv, ""); /* ignored */
1888 argv_array_push(&argv, "--left-right");
1889 argv_array_pushf(&argv, "%s...%s",
1890 oid_to_hex(&ours->object.oid),
1891 oid_to_hex(&theirs->object.oid));
1892 argv_array_push(&argv, "--");
1893 init_revisions(&revs, NULL);
1895 setup_revisions(argv.argc, argv.argv, &revs, NULL);
1896 if (prepare_revision_walk(&revs))
1897 die("revision walk setup failed");
1898 /* ... and count the commits on each side. */
1900 while (1) {
1901 struct commit *c = get_revision(&revs);
1902 if (!c)
1903 break;
1904 if (c->object.flags & SYMMETRIC_LEFT)
1905 (*num_ours)++;
1906 else
1907 (*num_theirs)++;
1908 }
1909 /* clear object flags smudged by the above traversal */
1911 clear_commit_marks(ours, ALL_REV_FLAGS);
1912 clear_commit_marks(theirs, ALL_REV_FLAGS);
1913 argv_array_clear(&argv);
1915 return 1;
1916}
1917/*
1919 * Return true when there is anything to report, otherwise false.
1920 */
1921int format_tracking_info(struct branch *branch, struct strbuf *sb,
1922 enum ahead_behind_flags abf)
1923{
1924 int ours, theirs, sti;
1925 const char *full_base;
1926 char *base;
1927 int upstream_is_gone = 0;
1928 sti = stat_tracking_info(branch, &ours, &theirs, &full_base, abf);
1930 if (sti < 0) {
1931 if (!full_base)
1932 return 0;
1933 upstream_is_gone = 1;
1934 }
1935 base = shorten_unambiguous_ref(full_base, 0);
1937 if (upstream_is_gone) {
1938 strbuf_addf(sb,
1939 _("Your branch is based on '%s', but the upstream is gone.\n"),
1940 base);
1941 if (advice_status_hints)
1942 strbuf_addstr(sb,
1943 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
1944 } else if (!sti) {
1945 strbuf_addf(sb,
1946 _("Your branch is up to date with '%s'.\n"),
1947 base);
1948 } else if (abf == AHEAD_BEHIND_QUICK) {
1949 strbuf_addf(sb,
1950 _("Your branch and '%s' refer to different commits.\n"),
1951 base);
1952 if (advice_status_hints)
1953 strbuf_addf(sb, _(" (use \"%s\" for details)\n"),
1954 "git status --ahead-behind");
1955 } else if (!theirs) {
1956 strbuf_addf(sb,
1957 Q_("Your branch is ahead of '%s' by %d commit.\n",
1958 "Your branch is ahead of '%s' by %d commits.\n",
1959 ours),
1960 base, ours);
1961 if (advice_status_hints)
1962 strbuf_addstr(sb,
1963 _(" (use \"git push\" to publish your local commits)\n"));
1964 } else if (!ours) {
1965 strbuf_addf(sb,
1966 Q_("Your branch is behind '%s' by %d commit, "
1967 "and can be fast-forwarded.\n",
1968 "Your branch is behind '%s' by %d commits, "
1969 "and can be fast-forwarded.\n",
1970 theirs),
1971 base, theirs);
1972 if (advice_status_hints)
1973 strbuf_addstr(sb,
1974 _(" (use \"git pull\" to update your local branch)\n"));
1975 } else {
1976 strbuf_addf(sb,
1977 Q_("Your branch and '%s' have diverged,\n"
1978 "and have %d and %d different commit each, "
1979 "respectively.\n",
1980 "Your branch and '%s' have diverged,\n"
1981 "and have %d and %d different commits each, "
1982 "respectively.\n",
1983 ours + theirs),
1984 base, ours, theirs);
1985 if (advice_status_hints)
1986 strbuf_addstr(sb,
1987 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
1988 }
1989 free(base);
1990 return 1;
1991}
1992static int one_local_ref(const char *refname, const struct object_id *oid,
1994 int flag, void *cb_data)
1995{
1996 struct ref ***local_tail = cb_data;
1997 struct ref *ref;
1998 /* we already know it starts with refs/ to get here */
2000 if (check_refname_format(refname + 5, 0))
2001 return 0;
2002 ref = alloc_ref(refname);
2004 oidcpy(&ref->new_oid, oid);
2005 **local_tail = ref;
2006 *local_tail = &ref->next;
2007 return 0;
2008}
2009struct ref *get_local_heads(void)
2011{
2012 struct ref *local_refs = NULL, **local_tail = &local_refs;
2013 for_each_ref(one_local_ref, &local_tail);
2015 return local_refs;
2016}
2017struct ref *guess_remote_head(const struct ref *head,
2019 const struct ref *refs,
2020 int all)
2021{
2022 const struct ref *r;
2023 struct ref *list = NULL;
2024 struct ref **tail = &list;
2025 if (!head)
2027 return NULL;
2028 /*
2030 * Some transports support directly peeking at
2031 * where HEAD points; if that is the case, then
2032 * we don't have to guess.
2033 */
2034 if (head->symref)
2035 return copy_ref(find_ref_by_name(refs, head->symref));
2036 /* If refs/heads/master could be right, it is. */
2038 if (!all) {
2039 r = find_ref_by_name(refs, "refs/heads/master");
2040 if (r && !oidcmp(&r->old_oid, &head->old_oid))
2041 return copy_ref(r);
2042 }
2043 /* Look for another ref that points there */
2045 for (r = refs; r; r = r->next) {
2046 if (r != head &&
2047 starts_with(r->name, "refs/heads/") &&
2048 !oidcmp(&r->old_oid, &head->old_oid)) {
2049 *tail = copy_ref(r);
2050 tail = &((*tail)->next);
2051 if (!all)
2052 break;
2053 }
2054 }
2055 return list;
2057}
2058struct stale_heads_info {
2060 struct string_list *ref_names;
2061 struct ref **stale_refs_tail;
2062 struct refspec *rs;
2063};
2064static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2066 int flags, void *cb_data)
2067{
2068 struct stale_heads_info *info = cb_data;
2069 struct string_list matches = STRING_LIST_INIT_DUP;
2070 struct refspec_item query;
2071 int i, stale = 1;
2072 memset(&query, 0, sizeof(struct refspec_item));
2073 query.dst = (char *)refname;
2074 query_refspecs_multiple(info->rs, &query, &matches);
2076 if (matches.nr == 0)
2077 goto clean_exit; /* No matches */
2078 /*
2080 * If we did find a suitable refspec and it's not a symref and
2081 * it's not in the list of refs that currently exist in that
2082 * remote, we consider it to be stale. In order to deal with
2083 * overlapping refspecs, we need to go over all of the
2084 * matching refs.
2085 */
2086 if (flags & REF_ISSYMREF)
2087 goto clean_exit;
2088 for (i = 0; stale && i < matches.nr; i++)
2090 if (string_list_has_string(info->ref_names, matches.items[i].string))
2091 stale = 0;
2092 if (stale) {
2094 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2095 oidcpy(&ref->new_oid, oid);
2096 }
2097clean_exit:
2099 string_list_clear(&matches, 0);
2100 return 0;
2101}
2102struct ref *get_stale_heads(struct refspec *rs, struct ref *fetch_map)
2104{
2105 struct ref *ref, *stale_refs = NULL;
2106 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2107 struct stale_heads_info info;
2108 info.ref_names = &ref_names;
2110 info.stale_refs_tail = &stale_refs;
2111 info.rs = rs;
2112 for (ref = fetch_map; ref; ref = ref->next)
2113 string_list_append(&ref_names, ref->name);
2114 string_list_sort(&ref_names);
2115 for_each_ref(get_stale_heads_cb, &info);
2116 string_list_clear(&ref_names, 0);
2117 return stale_refs;
2118}
2119/*
2121 * Compare-and-swap
2122 */
2123static void clear_cas_option(struct push_cas_option *cas)
2124{
2125 int i;
2126 for (i = 0; i < cas->nr; i++)
2128 free(cas->entry[i].refname);
2129 free(cas->entry);
2130 memset(cas, 0, sizeof(*cas));
2131}
2132static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2134 const char *refname,
2135 size_t refnamelen)
2136{
2137 struct push_cas *entry;
2138 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2139 entry = &cas->entry[cas->nr++];
2140 memset(entry, 0, sizeof(*entry));
2141 entry->refname = xmemdupz(refname, refnamelen);
2142 return entry;
2143}
2144static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2146{
2147 const char *colon;
2148 struct push_cas *entry;
2149 if (unset) {
2151 /* "--no-<option>" */
2152 clear_cas_option(cas);
2153 return 0;
2154 }
2155 if (!arg) {
2157 /* just "--<option>" */
2158 cas->use_tracking_for_rest = 1;
2159 return 0;
2160 }
2161 /* "--<option>=refname" or "--<option>=refname:value" */
2163 colon = strchrnul(arg, ':');
2164 entry = add_cas_entry(cas, arg, colon - arg);
2165 if (!*colon)
2166 entry->use_tracking = 1;
2167 else if (!colon[1])
2168 oidclr(&entry->expect);
2169 else if (get_oid(colon + 1, &entry->expect))
2170 return error("cannot parse expected object name '%s'", colon + 1);
2171 return 0;
2172}
2173int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2175{
2176 return parse_push_cas_option(opt->value, arg, unset);
2177}
2178int is_empty_cas(const struct push_cas_option *cas)
2180{
2181 return !cas->use_tracking_for_rest && !cas->nr;
2182}
2183/*
2185 * Look at remote.fetch refspec and see if we have a remote
2186 * tracking branch for the refname there. Fill its current
2187 * value in sha1[].
2188 * If we cannot do so, return negative to signal an error.
2189 */
2190static int remote_tracking(struct remote *remote, const char *refname,
2191 struct object_id *oid)
2192{
2193 char *dst;
2194 dst = apply_refspecs(&remote->fetch, refname);
2196 if (!dst)
2197 return -1; /* no tracking ref for refname at remote */
2198 if (read_ref(dst, oid))
2199 return -1; /* we know what the tracking ref is but we cannot read it */
2200 return 0;
2201}
2202static void apply_cas(struct push_cas_option *cas,
2204 struct remote *remote,
2205 struct ref *ref)
2206{
2207 int i;
2208 /* Find an explicit --<option>=<name>[:<value>] entry */
2210 for (i = 0; i < cas->nr; i++) {
2211 struct push_cas *entry = &cas->entry[i];
2212 if (!refname_match(entry->refname, ref->name))
2213 continue;
2214 ref->expect_old_sha1 = 1;
2215 if (!entry->use_tracking)
2216 oidcpy(&ref->old_oid_expect, &entry->expect);
2217 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2218 oidclr(&ref->old_oid_expect);
2219 return;
2220 }
2221 /* Are we using "--<option>" to cover all? */
2223 if (!cas->use_tracking_for_rest)
2224 return;
2225 ref->expect_old_sha1 = 1;
2227 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2228 oidclr(&ref->old_oid_expect);
2229}
2230void apply_push_cas(struct push_cas_option *cas,
2232 struct remote *remote,
2233 struct ref *remote_refs)
2234{
2235 struct ref *ref;
2236 for (ref = remote_refs; ref; ref = ref->next)
2237 apply_cas(cas, remote, ref);
2238}