Makefile: add missing GIT-VERSION-FILE dependency
[git/gitweb.git] / remote.c
blob6ececc4a7703f6d54caf919b1162ed454b45a47e
1 #include "cache.h"
2 #include "remote.h"
3 #include "refs.h"
4 #include "commit.h"
5 #include "diff.h"
6 #include "revision.h"
7 #include "dir.h"
8 #include "tag.h"
9 #include "string-list.h"
11 static struct refspec s_tag_refspec = {
15 "refs/tags/*",
16 "refs/tags/*"
19 const struct refspec *tag_refspec = &s_tag_refspec;
21 struct counted_string {
22 size_t len;
23 const char *s;
25 struct rewrite {
26 const char *base;
27 size_t baselen;
28 struct counted_string *instead_of;
29 int instead_of_nr;
30 int instead_of_alloc;
32 struct rewrites {
33 struct rewrite **rewrite;
34 int rewrite_alloc;
35 int rewrite_nr;
38 static struct remote **remotes;
39 static int remotes_alloc;
40 static int remotes_nr;
42 static struct branch **branches;
43 static int branches_alloc;
44 static int branches_nr;
46 static struct branch *current_branch;
47 static const char *default_remote_name;
48 static int explicit_default_remote_name;
50 static struct rewrites rewrites;
51 static struct rewrites rewrites_push;
53 #define BUF_SIZE (2048)
54 static char buffer[BUF_SIZE];
56 static int valid_remote(const struct remote *remote)
58 return (!!remote->url) || (!!remote->foreign_vcs);
61 static const char *alias_url(const char *url, struct rewrites *r)
63 int i, j;
64 char *ret;
65 struct counted_string *longest;
66 int longest_i;
68 longest = NULL;
69 longest_i = -1;
70 for (i = 0; i < r->rewrite_nr; i++) {
71 if (!r->rewrite[i])
72 continue;
73 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
74 if (!prefixcmp(url, r->rewrite[i]->instead_of[j].s) &&
75 (!longest ||
76 longest->len < r->rewrite[i]->instead_of[j].len)) {
77 longest = &(r->rewrite[i]->instead_of[j]);
78 longest_i = i;
82 if (!longest)
83 return url;
85 ret = xmalloc(r->rewrite[longest_i]->baselen +
86 (strlen(url) - longest->len) + 1);
87 strcpy(ret, r->rewrite[longest_i]->base);
88 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
89 return ret;
92 static void add_push_refspec(struct remote *remote, const char *ref)
94 ALLOC_GROW(remote->push_refspec,
95 remote->push_refspec_nr + 1,
96 remote->push_refspec_alloc);
97 remote->push_refspec[remote->push_refspec_nr++] = ref;
100 static void add_fetch_refspec(struct remote *remote, const char *ref)
102 ALLOC_GROW(remote->fetch_refspec,
103 remote->fetch_refspec_nr + 1,
104 remote->fetch_refspec_alloc);
105 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
108 static void add_url(struct remote *remote, const char *url)
110 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
111 remote->url[remote->url_nr++] = url;
114 static void add_pushurl(struct remote *remote, const char *pushurl)
116 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
117 remote->pushurl[remote->pushurl_nr++] = pushurl;
120 static void add_pushurl_alias(struct remote *remote, const char *url)
122 const char *pushurl = alias_url(url, &rewrites_push);
123 if (pushurl != url)
124 add_pushurl(remote, pushurl);
127 static void add_url_alias(struct remote *remote, const char *url)
129 add_url(remote, alias_url(url, &rewrites));
130 add_pushurl_alias(remote, url);
133 static struct remote *make_remote(const char *name, int len)
135 struct remote *ret;
136 int i;
138 for (i = 0; i < remotes_nr; i++) {
139 if (len ? (!strncmp(name, remotes[i]->name, len) &&
140 !remotes[i]->name[len]) :
141 !strcmp(name, remotes[i]->name))
142 return remotes[i];
145 ret = xcalloc(1, sizeof(struct remote));
146 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
147 remotes[remotes_nr++] = ret;
148 if (len)
149 ret->name = xstrndup(name, len);
150 else
151 ret->name = xstrdup(name);
152 return ret;
155 static void add_merge(struct branch *branch, const char *name)
157 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
158 branch->merge_alloc);
159 branch->merge_name[branch->merge_nr++] = name;
162 static struct branch *make_branch(const char *name, int len)
164 struct branch *ret;
165 int i;
166 char *refname;
168 for (i = 0; i < branches_nr; i++) {
169 if (len ? (!strncmp(name, branches[i]->name, len) &&
170 !branches[i]->name[len]) :
171 !strcmp(name, branches[i]->name))
172 return branches[i];
175 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
176 ret = xcalloc(1, sizeof(struct branch));
177 branches[branches_nr++] = ret;
178 if (len)
179 ret->name = xstrndup(name, len);
180 else
181 ret->name = xstrdup(name);
182 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
183 strcpy(refname, "refs/heads/");
184 strcpy(refname + strlen("refs/heads/"), ret->name);
185 ret->refname = refname;
187 return ret;
190 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
192 struct rewrite *ret;
193 int i;
195 for (i = 0; i < r->rewrite_nr; i++) {
196 if (len
197 ? (len == r->rewrite[i]->baselen &&
198 !strncmp(base, r->rewrite[i]->base, len))
199 : !strcmp(base, r->rewrite[i]->base))
200 return r->rewrite[i];
203 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
204 ret = xcalloc(1, sizeof(struct rewrite));
205 r->rewrite[r->rewrite_nr++] = ret;
206 if (len) {
207 ret->base = xstrndup(base, len);
208 ret->baselen = len;
210 else {
211 ret->base = xstrdup(base);
212 ret->baselen = strlen(base);
214 return ret;
217 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
219 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
220 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
221 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
222 rewrite->instead_of_nr++;
225 static void read_remotes_file(struct remote *remote)
227 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
229 if (!f)
230 return;
231 remote->origin = REMOTE_REMOTES;
232 while (fgets(buffer, BUF_SIZE, f)) {
233 int value_list;
234 char *s, *p;
236 if (!prefixcmp(buffer, "URL:")) {
237 value_list = 0;
238 s = buffer + 4;
239 } else if (!prefixcmp(buffer, "Push:")) {
240 value_list = 1;
241 s = buffer + 5;
242 } else if (!prefixcmp(buffer, "Pull:")) {
243 value_list = 2;
244 s = buffer + 5;
245 } else
246 continue;
248 while (isspace(*s))
249 s++;
250 if (!*s)
251 continue;
253 p = s + strlen(s);
254 while (isspace(p[-1]))
255 *--p = 0;
257 switch (value_list) {
258 case 0:
259 add_url_alias(remote, xstrdup(s));
260 break;
261 case 1:
262 add_push_refspec(remote, xstrdup(s));
263 break;
264 case 2:
265 add_fetch_refspec(remote, xstrdup(s));
266 break;
269 fclose(f);
272 static void read_branches_file(struct remote *remote)
274 const char *slash = strchr(remote->name, '/');
275 char *frag;
276 struct strbuf branch = STRBUF_INIT;
277 int n = slash ? slash - remote->name : 1000;
278 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
279 char *s, *p;
280 int len;
282 if (!f)
283 return;
284 s = fgets(buffer, BUF_SIZE, f);
285 fclose(f);
286 if (!s)
287 return;
288 while (isspace(*s))
289 s++;
290 if (!*s)
291 return;
292 remote->origin = REMOTE_BRANCHES;
293 p = s + strlen(s);
294 while (isspace(p[-1]))
295 *--p = 0;
296 len = p - s;
297 if (slash)
298 len += strlen(slash);
299 p = xmalloc(len + 1);
300 strcpy(p, s);
301 if (slash)
302 strcat(p, slash);
305 * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
306 * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
307 * the partial URL obtained from the branches file plus
308 * "/netdev-2.6" and does not store it in any tracking ref.
309 * #branch specifier in the file is ignored.
311 * Otherwise, the branches file would have URL and optionally
312 * #branch specified. The "master" (or specified) branch is
313 * fetched and stored in the local branch of the same name.
315 frag = strchr(p, '#');
316 if (frag) {
317 *(frag++) = '\0';
318 strbuf_addf(&branch, "refs/heads/%s", frag);
319 } else
320 strbuf_addstr(&branch, "refs/heads/master");
321 if (!slash) {
322 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
323 } else {
324 strbuf_reset(&branch);
325 strbuf_addstr(&branch, "HEAD:");
327 add_url_alias(remote, p);
328 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
330 * Cogito compatible push: push current HEAD to remote #branch
331 * (master if missing)
333 strbuf_init(&branch, 0);
334 strbuf_addstr(&branch, "HEAD");
335 if (frag)
336 strbuf_addf(&branch, ":refs/heads/%s", frag);
337 else
338 strbuf_addstr(&branch, ":refs/heads/master");
339 add_push_refspec(remote, strbuf_detach(&branch, NULL));
340 remote->fetch_tags = 1; /* always auto-follow */
343 static int handle_config(const char *key, const char *value, void *cb)
345 const char *name;
346 const char *subkey;
347 struct remote *remote;
348 struct branch *branch;
349 if (!prefixcmp(key, "branch.")) {
350 name = key + 7;
351 subkey = strrchr(name, '.');
352 if (!subkey)
353 return 0;
354 branch = make_branch(name, subkey - name);
355 if (!strcmp(subkey, ".remote")) {
356 if (!value)
357 return config_error_nonbool(key);
358 branch->remote_name = xstrdup(value);
359 if (branch == current_branch) {
360 default_remote_name = branch->remote_name;
361 explicit_default_remote_name = 1;
363 } else if (!strcmp(subkey, ".merge")) {
364 if (!value)
365 return config_error_nonbool(key);
366 add_merge(branch, xstrdup(value));
368 return 0;
370 if (!prefixcmp(key, "url.")) {
371 struct rewrite *rewrite;
372 name = key + 4;
373 subkey = strrchr(name, '.');
374 if (!subkey)
375 return 0;
376 if (!strcmp(subkey, ".insteadof")) {
377 rewrite = make_rewrite(&rewrites, name, subkey - name);
378 if (!value)
379 return config_error_nonbool(key);
380 add_instead_of(rewrite, xstrdup(value));
381 } else if (!strcmp(subkey, ".pushinsteadof")) {
382 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
383 if (!value)
384 return config_error_nonbool(key);
385 add_instead_of(rewrite, xstrdup(value));
388 if (prefixcmp(key, "remote."))
389 return 0;
390 name = key + 7;
391 if (*name == '/') {
392 warning("Config remote shorthand cannot begin with '/': %s",
393 name);
394 return 0;
396 subkey = strrchr(name, '.');
397 if (!subkey)
398 return 0;
399 remote = make_remote(name, subkey - name);
400 remote->origin = REMOTE_CONFIG;
401 if (!strcmp(subkey, ".mirror"))
402 remote->mirror = git_config_bool(key, value);
403 else if (!strcmp(subkey, ".skipdefaultupdate"))
404 remote->skip_default_update = git_config_bool(key, value);
405 else if (!strcmp(subkey, ".skipfetchall"))
406 remote->skip_default_update = git_config_bool(key, value);
407 else if (!strcmp(subkey, ".url")) {
408 const char *v;
409 if (git_config_string(&v, key, value))
410 return -1;
411 add_url(remote, v);
412 } else if (!strcmp(subkey, ".pushurl")) {
413 const char *v;
414 if (git_config_string(&v, key, value))
415 return -1;
416 add_pushurl(remote, v);
417 } else if (!strcmp(subkey, ".push")) {
418 const char *v;
419 if (git_config_string(&v, key, value))
420 return -1;
421 add_push_refspec(remote, v);
422 } else if (!strcmp(subkey, ".fetch")) {
423 const char *v;
424 if (git_config_string(&v, key, value))
425 return -1;
426 add_fetch_refspec(remote, v);
427 } else if (!strcmp(subkey, ".receivepack")) {
428 const char *v;
429 if (git_config_string(&v, key, value))
430 return -1;
431 if (!remote->receivepack)
432 remote->receivepack = v;
433 else
434 error("more than one receivepack given, using the first");
435 } else if (!strcmp(subkey, ".uploadpack")) {
436 const char *v;
437 if (git_config_string(&v, key, value))
438 return -1;
439 if (!remote->uploadpack)
440 remote->uploadpack = v;
441 else
442 error("more than one uploadpack given, using the first");
443 } else if (!strcmp(subkey, ".tagopt")) {
444 if (!strcmp(value, "--no-tags"))
445 remote->fetch_tags = -1;
446 else if (!strcmp(value, "--tags"))
447 remote->fetch_tags = 2;
448 } else if (!strcmp(subkey, ".proxy")) {
449 return git_config_string((const char **)&remote->http_proxy,
450 key, value);
451 } else if (!strcmp(subkey, ".vcs")) {
452 return git_config_string(&remote->foreign_vcs, key, value);
454 return 0;
457 static void alias_all_urls(void)
459 int i, j;
460 for (i = 0; i < remotes_nr; i++) {
461 int add_pushurl_aliases;
462 if (!remotes[i])
463 continue;
464 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
465 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
467 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
468 for (j = 0; j < remotes[i]->url_nr; j++) {
469 if (add_pushurl_aliases)
470 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
471 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
476 static void read_config(void)
478 unsigned char sha1[20];
479 const char *head_ref;
480 int flag;
481 if (default_remote_name) /* did this already */
482 return;
483 default_remote_name = xstrdup("origin");
484 current_branch = NULL;
485 head_ref = resolve_ref("HEAD", sha1, 0, &flag);
486 if (head_ref && (flag & REF_ISSYMREF) &&
487 !prefixcmp(head_ref, "refs/heads/")) {
488 current_branch =
489 make_branch(head_ref + strlen("refs/heads/"), 0);
491 git_config(handle_config, NULL);
492 alias_all_urls();
496 * We need to make sure the remote-tracking branches are well formed, but a
497 * wildcard refspec in "struct refspec" must have a trailing slash. We
498 * temporarily drop the trailing '/' while calling check_ref_format(),
499 * and put it back. The caller knows that a CHECK_REF_FORMAT_ONELEVEL
500 * error return is Ok for a wildcard refspec.
502 static int verify_refname(char *name, int is_glob)
504 int result;
506 result = check_ref_format(name);
507 if (is_glob && result == CHECK_REF_FORMAT_WILDCARD)
508 result = CHECK_REF_FORMAT_OK;
509 return result;
513 * This function frees a refspec array.
514 * Warning: code paths should be checked to ensure that the src
515 * and dst pointers are always freeable pointers as well
516 * as the refspec pointer itself.
518 static void free_refspecs(struct refspec *refspec, int nr_refspec)
520 int i;
522 if (!refspec)
523 return;
525 for (i = 0; i < nr_refspec; i++) {
526 free(refspec[i].src);
527 free(refspec[i].dst);
529 free(refspec);
532 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
534 int i;
535 int st;
536 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
538 for (i = 0; i < nr_refspec; i++) {
539 size_t llen;
540 int is_glob;
541 const char *lhs, *rhs;
543 is_glob = 0;
545 lhs = refspec[i];
546 if (*lhs == '+') {
547 rs[i].force = 1;
548 lhs++;
551 rhs = strrchr(lhs, ':');
554 * Before going on, special case ":" (or "+:") as a refspec
555 * for matching refs.
557 if (!fetch && rhs == lhs && rhs[1] == '\0') {
558 rs[i].matching = 1;
559 continue;
562 if (rhs) {
563 size_t rlen = strlen(++rhs);
564 is_glob = (1 <= rlen && strchr(rhs, '*'));
565 rs[i].dst = xstrndup(rhs, rlen);
568 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
569 if (1 <= llen && memchr(lhs, '*', llen)) {
570 if ((rhs && !is_glob) || (!rhs && fetch))
571 goto invalid;
572 is_glob = 1;
573 } else if (rhs && is_glob) {
574 goto invalid;
577 rs[i].pattern = is_glob;
578 rs[i].src = xstrndup(lhs, llen);
580 if (fetch) {
582 * LHS
583 * - empty is allowed; it means HEAD.
584 * - otherwise it must be a valid looking ref.
586 if (!*rs[i].src)
587 ; /* empty is ok */
588 else {
589 st = verify_refname(rs[i].src, is_glob);
590 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
591 goto invalid;
594 * RHS
595 * - missing is ok, and is same as empty.
596 * - empty is ok; it means not to store.
597 * - otherwise it must be a valid looking ref.
599 if (!rs[i].dst) {
600 ; /* ok */
601 } else if (!*rs[i].dst) {
602 ; /* ok */
603 } else {
604 st = verify_refname(rs[i].dst, is_glob);
605 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
606 goto invalid;
608 } else {
610 * LHS
611 * - empty is allowed; it means delete.
612 * - when wildcarded, it must be a valid looking ref.
613 * - otherwise, it must be an extended SHA-1, but
614 * there is no existing way to validate this.
616 if (!*rs[i].src)
617 ; /* empty is ok */
618 else if (is_glob) {
619 st = verify_refname(rs[i].src, is_glob);
620 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
621 goto invalid;
623 else
624 ; /* anything goes, for now */
626 * RHS
627 * - missing is allowed, but LHS then must be a
628 * valid looking ref.
629 * - empty is not allowed.
630 * - otherwise it must be a valid looking ref.
632 if (!rs[i].dst) {
633 st = verify_refname(rs[i].src, is_glob);
634 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
635 goto invalid;
636 } else if (!*rs[i].dst) {
637 goto invalid;
638 } else {
639 st = verify_refname(rs[i].dst, is_glob);
640 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
641 goto invalid;
645 return rs;
647 invalid:
648 if (verify) {
650 * nr_refspec must be greater than zero and i must be valid
651 * since it is only possible to reach this point from within
652 * the for loop above.
654 free_refspecs(rs, i+1);
655 return NULL;
657 die("Invalid refspec '%s'", refspec[i]);
660 int valid_fetch_refspec(const char *fetch_refspec_str)
662 struct refspec *refspec;
664 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
665 free_refspecs(refspec, 1);
666 return !!refspec;
669 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
671 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
674 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
676 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
679 void free_refspec(int nr_refspec, struct refspec *refspec)
681 int i;
682 for (i = 0; i < nr_refspec; i++) {
683 free(refspec[i].src);
684 free(refspec[i].dst);
686 free(refspec);
689 static int valid_remote_nick(const char *name)
691 if (!name[0] || is_dot_or_dotdot(name))
692 return 0;
693 return !strchr(name, '/'); /* no slash */
696 struct remote *remote_get(const char *name)
698 struct remote *ret;
699 int name_given = 0;
701 read_config();
702 if (name)
703 name_given = 1;
704 else {
705 name = default_remote_name;
706 name_given = explicit_default_remote_name;
709 ret = make_remote(name, 0);
710 if (valid_remote_nick(name)) {
711 if (!valid_remote(ret))
712 read_remotes_file(ret);
713 if (!valid_remote(ret))
714 read_branches_file(ret);
716 if (name_given && !valid_remote(ret))
717 add_url_alias(ret, name);
718 if (!valid_remote(ret))
719 return NULL;
720 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
721 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
722 return ret;
725 int remote_is_configured(const char *name)
727 int i;
728 read_config();
730 for (i = 0; i < remotes_nr; i++)
731 if (!strcmp(name, remotes[i]->name))
732 return 1;
733 return 0;
736 int for_each_remote(each_remote_fn fn, void *priv)
738 int i, result = 0;
739 read_config();
740 for (i = 0; i < remotes_nr && !result; i++) {
741 struct remote *r = remotes[i];
742 if (!r)
743 continue;
744 if (!r->fetch)
745 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
746 r->fetch_refspec);
747 if (!r->push)
748 r->push = parse_push_refspec(r->push_refspec_nr,
749 r->push_refspec);
750 result = fn(r, priv);
752 return result;
755 void ref_remove_duplicates(struct ref *ref_map)
757 struct string_list refs = STRING_LIST_INIT_NODUP;
758 struct string_list_item *item = NULL;
759 struct ref *prev = NULL, *next = NULL;
760 for (; ref_map; prev = ref_map, ref_map = next) {
761 next = ref_map->next;
762 if (!ref_map->peer_ref)
763 continue;
765 item = string_list_lookup(&refs, ref_map->peer_ref->name);
766 if (item) {
767 if (strcmp(((struct ref *)item->util)->name,
768 ref_map->name))
769 die("%s tracks both %s and %s",
770 ref_map->peer_ref->name,
771 ((struct ref *)item->util)->name,
772 ref_map->name);
773 prev->next = ref_map->next;
774 free(ref_map->peer_ref);
775 free(ref_map);
776 ref_map = prev; /* skip this; we freed it */
777 continue;
780 item = string_list_insert(&refs, ref_map->peer_ref->name);
781 item->util = ref_map;
783 string_list_clear(&refs, 0);
786 int remote_has_url(struct remote *remote, const char *url)
788 int i;
789 for (i = 0; i < remote->url_nr; i++) {
790 if (!strcmp(remote->url[i], url))
791 return 1;
793 return 0;
796 static int match_name_with_pattern(const char *key, const char *name,
797 const char *value, char **result)
799 const char *kstar = strchr(key, '*');
800 size_t klen;
801 size_t ksuffixlen;
802 size_t namelen;
803 int ret;
804 if (!kstar)
805 die("Key '%s' of pattern had no '*'", key);
806 klen = kstar - key;
807 ksuffixlen = strlen(kstar + 1);
808 namelen = strlen(name);
809 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
810 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
811 if (ret && value) {
812 const char *vstar = strchr(value, '*');
813 size_t vlen;
814 size_t vsuffixlen;
815 if (!vstar)
816 die("Value '%s' of pattern has no '*'", value);
817 vlen = vstar - value;
818 vsuffixlen = strlen(vstar + 1);
819 *result = xmalloc(vlen + vsuffixlen +
820 strlen(name) -
821 klen - ksuffixlen + 1);
822 strncpy(*result, value, vlen);
823 strncpy(*result + vlen,
824 name + klen, namelen - klen - ksuffixlen);
825 strcpy(*result + vlen + namelen - klen - ksuffixlen,
826 vstar + 1);
828 return ret;
831 static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
833 int i;
834 int find_src = !query->src;
836 if (find_src && !query->dst)
837 return error("query_refspecs: need either src or dst");
839 for (i = 0; i < ref_count; i++) {
840 struct refspec *refspec = &refs[i];
841 const char *key = find_src ? refspec->dst : refspec->src;
842 const char *value = find_src ? refspec->src : refspec->dst;
843 const char *needle = find_src ? query->dst : query->src;
844 char **result = find_src ? &query->src : &query->dst;
846 if (!refspec->dst)
847 continue;
848 if (refspec->pattern) {
849 if (match_name_with_pattern(key, needle, value, result)) {
850 query->force = refspec->force;
851 return 0;
853 } else if (!strcmp(needle, key)) {
854 *result = xstrdup(value);
855 query->force = refspec->force;
856 return 0;
859 return -1;
862 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
863 const char *name)
865 struct refspec query;
867 memset(&query, 0, sizeof(struct refspec));
868 query.src = (char *)name;
870 if (query_refspecs(refspecs, nr_refspec, &query))
871 return NULL;
873 return query.dst;
876 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
878 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
881 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
882 const char *name)
884 size_t len = strlen(name);
885 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
886 memcpy(ref->name, prefix, prefixlen);
887 memcpy(ref->name + prefixlen, name, len);
888 return ref;
891 struct ref *alloc_ref(const char *name)
893 return alloc_ref_with_prefix("", 0, name);
896 struct ref *copy_ref(const struct ref *ref)
898 struct ref *cpy;
899 size_t len;
900 if (!ref)
901 return NULL;
902 len = strlen(ref->name);
903 cpy = xmalloc(sizeof(struct ref) + len + 1);
904 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
905 cpy->next = NULL;
906 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
907 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
908 cpy->peer_ref = copy_ref(ref->peer_ref);
909 return cpy;
912 struct ref *copy_ref_list(const struct ref *ref)
914 struct ref *ret = NULL;
915 struct ref **tail = &ret;
916 while (ref) {
917 *tail = copy_ref(ref);
918 ref = ref->next;
919 tail = &((*tail)->next);
921 return ret;
924 static void free_ref(struct ref *ref)
926 if (!ref)
927 return;
928 free_ref(ref->peer_ref);
929 free(ref->remote_status);
930 free(ref->symref);
931 free(ref);
934 void free_refs(struct ref *ref)
936 struct ref *next;
937 while (ref) {
938 next = ref->next;
939 free_ref(ref);
940 ref = next;
944 static int count_refspec_match(const char *pattern,
945 struct ref *refs,
946 struct ref **matched_ref)
948 int patlen = strlen(pattern);
949 struct ref *matched_weak = NULL;
950 struct ref *matched = NULL;
951 int weak_match = 0;
952 int match = 0;
954 for (weak_match = match = 0; refs; refs = refs->next) {
955 char *name = refs->name;
956 int namelen = strlen(name);
958 if (!refname_match(pattern, name, ref_rev_parse_rules))
959 continue;
961 /* A match is "weak" if it is with refs outside
962 * heads or tags, and did not specify the pattern
963 * in full (e.g. "refs/remotes/origin/master") or at
964 * least from the toplevel (e.g. "remotes/origin/master");
965 * otherwise "git push $URL master" would result in
966 * ambiguity between remotes/origin/master and heads/master
967 * at the remote site.
969 if (namelen != patlen &&
970 patlen != namelen - 5 &&
971 prefixcmp(name, "refs/heads/") &&
972 prefixcmp(name, "refs/tags/")) {
973 /* We want to catch the case where only weak
974 * matches are found and there are multiple
975 * matches, and where more than one strong
976 * matches are found, as ambiguous. One
977 * strong match with zero or more weak matches
978 * are acceptable as a unique match.
980 matched_weak = refs;
981 weak_match++;
983 else {
984 matched = refs;
985 match++;
988 if (!matched) {
989 *matched_ref = matched_weak;
990 return weak_match;
992 else {
993 *matched_ref = matched;
994 return match;
998 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1000 **tail = ref;
1001 while (ref->next)
1002 ref = ref->next;
1003 *tail = &ref->next;
1006 static struct ref *try_explicit_object_name(const char *name)
1008 unsigned char sha1[20];
1009 struct ref *ref;
1011 if (!*name) {
1012 ref = alloc_ref("(delete)");
1013 hashclr(ref->new_sha1);
1014 return ref;
1016 if (get_sha1(name, sha1))
1017 return NULL;
1018 ref = alloc_ref(name);
1019 hashcpy(ref->new_sha1, sha1);
1020 return ref;
1023 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1025 struct ref *ret = alloc_ref(name);
1026 tail_link_ref(ret, tail);
1027 return ret;
1030 static char *guess_ref(const char *name, struct ref *peer)
1032 struct strbuf buf = STRBUF_INIT;
1033 unsigned char sha1[20];
1035 const char *r = resolve_ref(peer->name, sha1, 1, NULL);
1036 if (!r)
1037 return NULL;
1039 if (!prefixcmp(r, "refs/heads/"))
1040 strbuf_addstr(&buf, "refs/heads/");
1041 else if (!prefixcmp(r, "refs/tags/"))
1042 strbuf_addstr(&buf, "refs/tags/");
1043 else
1044 return NULL;
1046 strbuf_addstr(&buf, name);
1047 return strbuf_detach(&buf, NULL);
1050 static int match_explicit(struct ref *src, struct ref *dst,
1051 struct ref ***dst_tail,
1052 struct refspec *rs)
1054 struct ref *matched_src, *matched_dst;
1055 int copy_src;
1057 const char *dst_value = rs->dst;
1058 char *dst_guess;
1060 if (rs->pattern || rs->matching)
1061 return 0;
1063 matched_src = matched_dst = NULL;
1064 switch (count_refspec_match(rs->src, src, &matched_src)) {
1065 case 1:
1066 copy_src = 1;
1067 break;
1068 case 0:
1069 /* The source could be in the get_sha1() format
1070 * not a reference name. :refs/other is a
1071 * way to delete 'other' ref at the remote end.
1073 matched_src = try_explicit_object_name(rs->src);
1074 if (!matched_src)
1075 return error("src refspec %s does not match any.", rs->src);
1076 copy_src = 0;
1077 break;
1078 default:
1079 return error("src refspec %s matches more than one.", rs->src);
1082 if (!dst_value) {
1083 unsigned char sha1[20];
1084 int flag;
1086 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
1087 if (!dst_value ||
1088 ((flag & REF_ISSYMREF) &&
1089 prefixcmp(dst_value, "refs/heads/")))
1090 die("%s cannot be resolved to branch.",
1091 matched_src->name);
1094 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1095 case 1:
1096 break;
1097 case 0:
1098 if (!memcmp(dst_value, "refs/", 5))
1099 matched_dst = make_linked_ref(dst_value, dst_tail);
1100 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1101 matched_dst = make_linked_ref(dst_guess, dst_tail);
1102 else
1103 error("unable to push to unqualified destination: %s\n"
1104 "The destination refspec neither matches an "
1105 "existing ref on the remote nor\n"
1106 "begins with refs/, and we are unable to "
1107 "guess a prefix based on the source ref.",
1108 dst_value);
1109 break;
1110 default:
1111 matched_dst = NULL;
1112 error("dst refspec %s matches more than one.",
1113 dst_value);
1114 break;
1116 if (!matched_dst)
1117 return -1;
1118 if (matched_dst->peer_ref)
1119 return error("dst ref %s receives from more than one src.",
1120 matched_dst->name);
1121 else {
1122 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1123 matched_dst->force = rs->force;
1125 return 0;
1128 static int match_explicit_refs(struct ref *src, struct ref *dst,
1129 struct ref ***dst_tail, struct refspec *rs,
1130 int rs_nr)
1132 int i, errs;
1133 for (i = errs = 0; i < rs_nr; i++)
1134 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1135 return errs;
1138 static const struct refspec *check_pattern_match(const struct refspec *rs,
1139 int rs_nr,
1140 const struct ref *src)
1142 int i;
1143 int matching_refs = -1;
1144 for (i = 0; i < rs_nr; i++) {
1145 if (rs[i].matching &&
1146 (matching_refs == -1 || rs[i].force)) {
1147 matching_refs = i;
1148 continue;
1151 if (rs[i].pattern && match_name_with_pattern(rs[i].src, src->name,
1152 NULL, NULL))
1153 return rs + i;
1155 if (matching_refs != -1)
1156 return rs + matching_refs;
1157 else
1158 return NULL;
1161 static struct ref **tail_ref(struct ref **head)
1163 struct ref **tail = head;
1164 while (*tail)
1165 tail = &((*tail)->next);
1166 return tail;
1170 * Note. This is used only by "push"; refspec matching rules for
1171 * push and fetch are subtly different, so do not try to reuse it
1172 * without thinking.
1174 int match_refs(struct ref *src, struct ref **dst,
1175 int nr_refspec, const char **refspec, int flags)
1177 struct refspec *rs;
1178 int send_all = flags & MATCH_REFS_ALL;
1179 int send_mirror = flags & MATCH_REFS_MIRROR;
1180 int errs;
1181 static const char *default_refspec[] = { ":", NULL };
1182 struct ref **dst_tail = tail_ref(dst);
1184 if (!nr_refspec) {
1185 nr_refspec = 1;
1186 refspec = default_refspec;
1188 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1189 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1191 /* pick the remainder */
1192 for ( ; src; src = src->next) {
1193 struct ref *dst_peer;
1194 const struct refspec *pat = NULL;
1195 char *dst_name;
1196 if (src->peer_ref)
1197 continue;
1199 pat = check_pattern_match(rs, nr_refspec, src);
1200 if (!pat)
1201 continue;
1203 if (pat->matching) {
1205 * "matching refs"; traditionally we pushed everything
1206 * including refs outside refs/heads/ hierarchy, but
1207 * that does not make much sense these days.
1209 if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
1210 continue;
1211 dst_name = xstrdup(src->name);
1213 } else {
1214 const char *dst_side = pat->dst ? pat->dst : pat->src;
1215 if (!match_name_with_pattern(pat->src, src->name,
1216 dst_side, &dst_name))
1217 die("Didn't think it matches any more");
1219 dst_peer = find_ref_by_name(*dst, dst_name);
1220 if (dst_peer) {
1221 if (dst_peer->peer_ref)
1222 /* We're already sending something to this ref. */
1223 goto free_name;
1225 } else {
1226 if (pat->matching && !(send_all || send_mirror))
1228 * Remote doesn't have it, and we have no
1229 * explicit pattern, and we don't have
1230 * --all nor --mirror.
1232 goto free_name;
1234 /* Create a new one and link it */
1235 dst_peer = make_linked_ref(dst_name, &dst_tail);
1236 hashcpy(dst_peer->new_sha1, src->new_sha1);
1238 dst_peer->peer_ref = copy_ref(src);
1239 dst_peer->force = pat->force;
1240 free_name:
1241 free(dst_name);
1243 if (errs)
1244 return -1;
1245 return 0;
1248 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1249 int force_update)
1251 struct ref *ref;
1253 for (ref = remote_refs; ref; ref = ref->next) {
1254 if (ref->peer_ref)
1255 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1256 else if (!send_mirror)
1257 continue;
1259 ref->deletion = is_null_sha1(ref->new_sha1);
1260 if (!ref->deletion &&
1261 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1262 ref->status = REF_STATUS_UPTODATE;
1263 continue;
1266 /* This part determines what can overwrite what.
1267 * The rules are:
1269 * (0) you can always use --force or +A:B notation to
1270 * selectively force individual ref pairs.
1272 * (1) if the old thing does not exist, it is OK.
1274 * (2) if you do not have the old thing, you are not allowed
1275 * to overwrite it; you would not know what you are losing
1276 * otherwise.
1278 * (3) if both new and old are commit-ish, and new is a
1279 * descendant of old, it is OK.
1281 * (4) regardless of all of the above, removing :B is
1282 * always allowed.
1285 ref->nonfastforward =
1286 !ref->deletion &&
1287 !is_null_sha1(ref->old_sha1) &&
1288 (!has_sha1_file(ref->old_sha1)
1289 || !ref_newer(ref->new_sha1, ref->old_sha1));
1291 if (ref->nonfastforward && !ref->force && !force_update) {
1292 ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
1293 continue;
1298 struct branch *branch_get(const char *name)
1300 struct branch *ret;
1302 read_config();
1303 if (!name || !*name || !strcmp(name, "HEAD"))
1304 ret = current_branch;
1305 else
1306 ret = make_branch(name, 0);
1307 if (ret && ret->remote_name) {
1308 ret->remote = remote_get(ret->remote_name);
1309 if (ret->merge_nr) {
1310 int i;
1311 ret->merge = xcalloc(sizeof(*ret->merge),
1312 ret->merge_nr);
1313 for (i = 0; i < ret->merge_nr; i++) {
1314 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1315 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1316 if (remote_find_tracking(ret->remote, ret->merge[i])
1317 && !strcmp(ret->remote_name, "."))
1318 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1322 return ret;
1325 int branch_has_merge_config(struct branch *branch)
1327 return branch && !!branch->merge;
1330 int branch_merge_matches(struct branch *branch,
1331 int i,
1332 const char *refname)
1334 if (!branch || i < 0 || i >= branch->merge_nr)
1335 return 0;
1336 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1339 static struct ref *get_expanded_map(const struct ref *remote_refs,
1340 const struct refspec *refspec)
1342 const struct ref *ref;
1343 struct ref *ret = NULL;
1344 struct ref **tail = &ret;
1346 char *expn_name;
1348 for (ref = remote_refs; ref; ref = ref->next) {
1349 if (strchr(ref->name, '^'))
1350 continue; /* a dereference item */
1351 if (match_name_with_pattern(refspec->src, ref->name,
1352 refspec->dst, &expn_name)) {
1353 struct ref *cpy = copy_ref(ref);
1355 cpy->peer_ref = alloc_ref(expn_name);
1356 free(expn_name);
1357 if (refspec->force)
1358 cpy->peer_ref->force = 1;
1359 *tail = cpy;
1360 tail = &cpy->next;
1364 return ret;
1367 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1369 const struct ref *ref;
1370 for (ref = refs; ref; ref = ref->next) {
1371 if (refname_match(name, ref->name, ref_fetch_rules))
1372 return ref;
1374 return NULL;
1377 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1379 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1381 if (!ref)
1382 return NULL;
1384 return copy_ref(ref);
1387 static struct ref *get_local_ref(const char *name)
1389 if (!name || name[0] == '\0')
1390 return NULL;
1392 if (!prefixcmp(name, "refs/"))
1393 return alloc_ref(name);
1395 if (!prefixcmp(name, "heads/") ||
1396 !prefixcmp(name, "tags/") ||
1397 !prefixcmp(name, "remotes/"))
1398 return alloc_ref_with_prefix("refs/", 5, name);
1400 return alloc_ref_with_prefix("refs/heads/", 11, name);
1403 int get_fetch_map(const struct ref *remote_refs,
1404 const struct refspec *refspec,
1405 struct ref ***tail,
1406 int missing_ok)
1408 struct ref *ref_map, **rmp;
1410 if (refspec->pattern) {
1411 ref_map = get_expanded_map(remote_refs, refspec);
1412 } else {
1413 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1415 ref_map = get_remote_ref(remote_refs, name);
1416 if (!missing_ok && !ref_map)
1417 die("Couldn't find remote ref %s", name);
1418 if (ref_map) {
1419 ref_map->peer_ref = get_local_ref(refspec->dst);
1420 if (ref_map->peer_ref && refspec->force)
1421 ref_map->peer_ref->force = 1;
1425 for (rmp = &ref_map; *rmp; ) {
1426 if ((*rmp)->peer_ref) {
1427 int st = check_ref_format((*rmp)->peer_ref->name + 5);
1428 if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
1429 struct ref *ignore = *rmp;
1430 error("* Ignoring funny ref '%s' locally",
1431 (*rmp)->peer_ref->name);
1432 *rmp = (*rmp)->next;
1433 free(ignore->peer_ref);
1434 free(ignore);
1435 continue;
1438 rmp = &((*rmp)->next);
1441 if (ref_map)
1442 tail_link_ref(ref_map, tail);
1444 return 0;
1447 int resolve_remote_symref(struct ref *ref, struct ref *list)
1449 if (!ref->symref)
1450 return 0;
1451 for (; list; list = list->next)
1452 if (!strcmp(ref->symref, list->name)) {
1453 hashcpy(ref->old_sha1, list->old_sha1);
1454 return 0;
1456 return 1;
1459 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1461 while (list) {
1462 struct commit_list *temp = list;
1463 temp->item->object.flags &= ~mark;
1464 list = temp->next;
1465 free(temp);
1469 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1471 struct object *o;
1472 struct commit *old, *new;
1473 struct commit_list *list, *used;
1474 int found = 0;
1476 /* Both new and old must be commit-ish and new is descendant of
1477 * old. Otherwise we require --force.
1479 o = deref_tag(parse_object(old_sha1), NULL, 0);
1480 if (!o || o->type != OBJ_COMMIT)
1481 return 0;
1482 old = (struct commit *) o;
1484 o = deref_tag(parse_object(new_sha1), NULL, 0);
1485 if (!o || o->type != OBJ_COMMIT)
1486 return 0;
1487 new = (struct commit *) o;
1489 if (parse_commit(new) < 0)
1490 return 0;
1492 used = list = NULL;
1493 commit_list_insert(new, &list);
1494 while (list) {
1495 new = pop_most_recent_commit(&list, TMP_MARK);
1496 commit_list_insert(new, &used);
1497 if (new == old) {
1498 found = 1;
1499 break;
1502 unmark_and_free(list, TMP_MARK);
1503 unmark_and_free(used, TMP_MARK);
1504 return found;
1508 * Return true if there is anything to report, otherwise false.
1510 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1512 unsigned char sha1[20];
1513 struct commit *ours, *theirs;
1514 char symmetric[84];
1515 struct rev_info revs;
1516 const char *rev_argv[10], *base;
1517 int rev_argc;
1520 * Nothing to report unless we are marked to build on top of
1521 * somebody else.
1523 if (!branch ||
1524 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1525 return 0;
1528 * If what we used to build on no longer exists, there is
1529 * nothing to report.
1531 base = branch->merge[0]->dst;
1532 if (!resolve_ref(base, sha1, 1, NULL))
1533 return 0;
1534 theirs = lookup_commit_reference(sha1);
1535 if (!theirs)
1536 return 0;
1538 if (!resolve_ref(branch->refname, sha1, 1, NULL))
1539 return 0;
1540 ours = lookup_commit_reference(sha1);
1541 if (!ours)
1542 return 0;
1544 /* are we the same? */
1545 if (theirs == ours)
1546 return 0;
1548 /* Run "rev-list --left-right ours...theirs" internally... */
1549 rev_argc = 0;
1550 rev_argv[rev_argc++] = NULL;
1551 rev_argv[rev_argc++] = "--left-right";
1552 rev_argv[rev_argc++] = symmetric;
1553 rev_argv[rev_argc++] = "--";
1554 rev_argv[rev_argc] = NULL;
1556 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1557 strcpy(symmetric + 40, "...");
1558 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1560 init_revisions(&revs, NULL);
1561 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1562 prepare_revision_walk(&revs);
1564 /* ... and count the commits on each side. */
1565 *num_ours = 0;
1566 *num_theirs = 0;
1567 while (1) {
1568 struct commit *c = get_revision(&revs);
1569 if (!c)
1570 break;
1571 if (c->object.flags & SYMMETRIC_LEFT)
1572 (*num_ours)++;
1573 else
1574 (*num_theirs)++;
1577 /* clear object flags smudged by the above traversal */
1578 clear_commit_marks(ours, ALL_REV_FLAGS);
1579 clear_commit_marks(theirs, ALL_REV_FLAGS);
1580 return 1;
1584 * Return true when there is anything to report, otherwise false.
1586 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1588 int num_ours, num_theirs;
1589 const char *base;
1591 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1592 return 0;
1594 base = branch->merge[0]->dst;
1595 base = shorten_unambiguous_ref(base, 0);
1596 if (!num_theirs)
1597 strbuf_addf(sb, "Your branch is ahead of '%s' "
1598 "by %d commit%s.\n",
1599 base, num_ours, (num_ours == 1) ? "" : "s");
1600 else if (!num_ours)
1601 strbuf_addf(sb, "Your branch is behind '%s' "
1602 "by %d commit%s, "
1603 "and can be fast-forwarded.\n",
1604 base, num_theirs, (num_theirs == 1) ? "" : "s");
1605 else
1606 strbuf_addf(sb, "Your branch and '%s' have diverged,\n"
1607 "and have %d and %d different commit(s) each, "
1608 "respectively.\n",
1609 base, num_ours, num_theirs);
1610 return 1;
1613 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1615 struct ref ***local_tail = cb_data;
1616 struct ref *ref;
1617 int len;
1619 /* we already know it starts with refs/ to get here */
1620 if (check_ref_format(refname + 5))
1621 return 0;
1623 len = strlen(refname) + 1;
1624 ref = xcalloc(1, sizeof(*ref) + len);
1625 hashcpy(ref->new_sha1, sha1);
1626 memcpy(ref->name, refname, len);
1627 **local_tail = ref;
1628 *local_tail = &ref->next;
1629 return 0;
1632 struct ref *get_local_heads(void)
1634 struct ref *local_refs = NULL, **local_tail = &local_refs;
1635 for_each_ref(one_local_ref, &local_tail);
1636 return local_refs;
1639 struct ref *guess_remote_head(const struct ref *head,
1640 const struct ref *refs,
1641 int all)
1643 const struct ref *r;
1644 struct ref *list = NULL;
1645 struct ref **tail = &list;
1647 if (!head)
1648 return NULL;
1651 * Some transports support directly peeking at
1652 * where HEAD points; if that is the case, then
1653 * we don't have to guess.
1655 if (head->symref)
1656 return copy_ref(find_ref_by_name(refs, head->symref));
1658 /* If refs/heads/master could be right, it is. */
1659 if (!all) {
1660 r = find_ref_by_name(refs, "refs/heads/master");
1661 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1662 return copy_ref(r);
1665 /* Look for another ref that points there */
1666 for (r = refs; r; r = r->next) {
1667 if (r != head &&
1668 !prefixcmp(r->name, "refs/heads/") &&
1669 !hashcmp(r->old_sha1, head->old_sha1)) {
1670 *tail = copy_ref(r);
1671 tail = &((*tail)->next);
1672 if (!all)
1673 break;
1677 return list;
1680 struct stale_heads_info {
1681 struct string_list *ref_names;
1682 struct ref **stale_refs_tail;
1683 struct refspec *refs;
1684 int ref_count;
1687 static int get_stale_heads_cb(const char *refname,
1688 const unsigned char *sha1, int flags, void *cb_data)
1690 struct stale_heads_info *info = cb_data;
1691 struct refspec query;
1692 memset(&query, 0, sizeof(struct refspec));
1693 query.dst = (char *)refname;
1695 if (query_refspecs(info->refs, info->ref_count, &query))
1696 return 0; /* No matches */
1699 * If we did find a suitable refspec and it's not a symref and
1700 * it's not in the list of refs that currently exist in that
1701 * remote we consider it to be stale.
1703 if (!((flags & REF_ISSYMREF) ||
1704 string_list_has_string(info->ref_names, query.src))) {
1705 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1706 hashcpy(ref->new_sha1, sha1);
1709 free(query.src);
1710 return 0;
1713 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
1715 struct ref *ref, *stale_refs = NULL;
1716 struct string_list ref_names = STRING_LIST_INIT_NODUP;
1717 struct stale_heads_info info;
1718 info.ref_names = &ref_names;
1719 info.stale_refs_tail = &stale_refs;
1720 info.refs = refs;
1721 info.ref_count = ref_count;
1722 for (ref = fetch_map; ref; ref = ref->next)
1723 string_list_append(&ref_names, ref->name);
1724 sort_string_list(&ref_names);
1725 for_each_ref(get_stale_heads_cb, &info);
1726 string_list_clear(&ref_names, 0);
1727 return stale_refs;