submodule: Use cat instead of echo to avoid DOS line-endings
[git/dscho.git] / remote.c
blobb296d174043b5e5a11aceb9940ba6ba035e77678
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 enum map_direction { FROM_SRC, FROM_DST };
13 static struct refspec s_tag_refspec = {
17 "refs/tags/*",
18 "refs/tags/*"
21 const struct refspec *tag_refspec = &s_tag_refspec;
23 struct counted_string {
24 size_t len;
25 const char *s;
27 struct rewrite {
28 const char *base;
29 size_t baselen;
30 struct counted_string *instead_of;
31 int instead_of_nr;
32 int instead_of_alloc;
34 struct rewrites {
35 struct rewrite **rewrite;
36 int rewrite_alloc;
37 int rewrite_nr;
40 static struct remote **remotes;
41 static int remotes_alloc;
42 static int remotes_nr;
44 static struct branch **branches;
45 static int branches_alloc;
46 static int branches_nr;
48 static struct branch *current_branch;
49 static const char *default_remote_name;
50 static int explicit_default_remote_name;
52 static struct rewrites rewrites;
53 static struct rewrites rewrites_push;
55 #define BUF_SIZE (2048)
56 static char buffer[BUF_SIZE];
58 static int valid_remote(const struct remote *remote)
60 return (!!remote->url) || (!!remote->foreign_vcs);
63 static const char *alias_url(const char *url, struct rewrites *r)
65 int i, j;
66 char *ret;
67 struct counted_string *longest;
68 int longest_i;
70 longest = NULL;
71 longest_i = -1;
72 for (i = 0; i < r->rewrite_nr; i++) {
73 if (!r->rewrite[i])
74 continue;
75 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
76 if (!prefixcmp(url, r->rewrite[i]->instead_of[j].s) &&
77 (!longest ||
78 longest->len < r->rewrite[i]->instead_of[j].len)) {
79 longest = &(r->rewrite[i]->instead_of[j]);
80 longest_i = i;
84 if (!longest)
85 return url;
87 ret = xmalloc(r->rewrite[longest_i]->baselen +
88 (strlen(url) - longest->len) + 1);
89 strcpy(ret, r->rewrite[longest_i]->base);
90 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
91 return ret;
94 static void add_push_refspec(struct remote *remote, const char *ref)
96 ALLOC_GROW(remote->push_refspec,
97 remote->push_refspec_nr + 1,
98 remote->push_refspec_alloc);
99 remote->push_refspec[remote->push_refspec_nr++] = ref;
102 static void add_fetch_refspec(struct remote *remote, const char *ref)
104 ALLOC_GROW(remote->fetch_refspec,
105 remote->fetch_refspec_nr + 1,
106 remote->fetch_refspec_alloc);
107 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
110 static void add_url(struct remote *remote, const char *url)
112 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
113 remote->url[remote->url_nr++] = url;
116 static void add_pushurl(struct remote *remote, const char *pushurl)
118 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
119 remote->pushurl[remote->pushurl_nr++] = pushurl;
122 static void add_pushurl_alias(struct remote *remote, const char *url)
124 const char *pushurl = alias_url(url, &rewrites_push);
125 if (pushurl != url)
126 add_pushurl(remote, pushurl);
129 static void add_url_alias(struct remote *remote, const char *url)
131 add_url(remote, alias_url(url, &rewrites));
132 add_pushurl_alias(remote, url);
135 static struct remote *make_remote(const char *name, int len)
137 struct remote *ret;
138 int i;
140 for (i = 0; i < remotes_nr; i++) {
141 if (len ? (!strncmp(name, remotes[i]->name, len) &&
142 !remotes[i]->name[len]) :
143 !strcmp(name, remotes[i]->name))
144 return remotes[i];
147 ret = xcalloc(1, sizeof(struct remote));
148 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
149 remotes[remotes_nr++] = ret;
150 if (len)
151 ret->name = xstrndup(name, len);
152 else
153 ret->name = xstrdup(name);
154 return ret;
157 static void add_merge(struct branch *branch, const char *name)
159 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
160 branch->merge_alloc);
161 branch->merge_name[branch->merge_nr++] = name;
164 static struct branch *make_branch(const char *name, int len)
166 struct branch *ret;
167 int i;
168 char *refname;
170 for (i = 0; i < branches_nr; i++) {
171 if (len ? (!strncmp(name, branches[i]->name, len) &&
172 !branches[i]->name[len]) :
173 !strcmp(name, branches[i]->name))
174 return branches[i];
177 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
178 ret = xcalloc(1, sizeof(struct branch));
179 branches[branches_nr++] = ret;
180 if (len)
181 ret->name = xstrndup(name, len);
182 else
183 ret->name = xstrdup(name);
184 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
185 strcpy(refname, "refs/heads/");
186 strcpy(refname + strlen("refs/heads/"), ret->name);
187 ret->refname = refname;
189 return ret;
192 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
194 struct rewrite *ret;
195 int i;
197 for (i = 0; i < r->rewrite_nr; i++) {
198 if (len
199 ? (len == r->rewrite[i]->baselen &&
200 !strncmp(base, r->rewrite[i]->base, len))
201 : !strcmp(base, r->rewrite[i]->base))
202 return r->rewrite[i];
205 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
206 ret = xcalloc(1, sizeof(struct rewrite));
207 r->rewrite[r->rewrite_nr++] = ret;
208 if (len) {
209 ret->base = xstrndup(base, len);
210 ret->baselen = len;
212 else {
213 ret->base = xstrdup(base);
214 ret->baselen = strlen(base);
216 return ret;
219 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
221 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
222 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
223 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
224 rewrite->instead_of_nr++;
227 static void read_remotes_file(struct remote *remote)
229 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
231 if (!f)
232 return;
233 remote->origin = REMOTE_REMOTES;
234 while (fgets(buffer, BUF_SIZE, f)) {
235 int value_list;
236 char *s, *p;
238 if (!prefixcmp(buffer, "URL:")) {
239 value_list = 0;
240 s = buffer + 4;
241 } else if (!prefixcmp(buffer, "Push:")) {
242 value_list = 1;
243 s = buffer + 5;
244 } else if (!prefixcmp(buffer, "Pull:")) {
245 value_list = 2;
246 s = buffer + 5;
247 } else
248 continue;
250 while (isspace(*s))
251 s++;
252 if (!*s)
253 continue;
255 p = s + strlen(s);
256 while (isspace(p[-1]))
257 *--p = 0;
259 switch (value_list) {
260 case 0:
261 add_url_alias(remote, xstrdup(s));
262 break;
263 case 1:
264 add_push_refspec(remote, xstrdup(s));
265 break;
266 case 2:
267 add_fetch_refspec(remote, xstrdup(s));
268 break;
271 fclose(f);
274 static void read_branches_file(struct remote *remote)
276 const char *slash = strchr(remote->name, '/');
277 char *frag;
278 struct strbuf branch = STRBUF_INIT;
279 int n = slash ? slash - remote->name : 1000;
280 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
281 char *s, *p;
282 int len;
284 if (!f)
285 return;
286 s = fgets(buffer, BUF_SIZE, f);
287 fclose(f);
288 if (!s)
289 return;
290 while (isspace(*s))
291 s++;
292 if (!*s)
293 return;
294 remote->origin = REMOTE_BRANCHES;
295 p = s + strlen(s);
296 while (isspace(p[-1]))
297 *--p = 0;
298 len = p - s;
299 if (slash)
300 len += strlen(slash);
301 p = xmalloc(len + 1);
302 strcpy(p, s);
303 if (slash)
304 strcat(p, slash);
307 * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
308 * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
309 * the partial URL obtained from the branches file plus
310 * "/netdev-2.6" and does not store it in any tracking ref.
311 * #branch specifier in the file is ignored.
313 * Otherwise, the branches file would have URL and optionally
314 * #branch specified. The "master" (or specified) branch is
315 * fetched and stored in the local branch of the same name.
317 frag = strchr(p, '#');
318 if (frag) {
319 *(frag++) = '\0';
320 strbuf_addf(&branch, "refs/heads/%s", frag);
321 } else
322 strbuf_addstr(&branch, "refs/heads/master");
323 if (!slash) {
324 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
325 } else {
326 strbuf_reset(&branch);
327 strbuf_addstr(&branch, "HEAD:");
329 add_url_alias(remote, p);
330 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
332 * Cogito compatible push: push current HEAD to remote #branch
333 * (master if missing)
335 strbuf_init(&branch, 0);
336 strbuf_addstr(&branch, "HEAD");
337 if (frag)
338 strbuf_addf(&branch, ":refs/heads/%s", frag);
339 else
340 strbuf_addstr(&branch, ":refs/heads/master");
341 add_push_refspec(remote, strbuf_detach(&branch, NULL));
342 remote->fetch_tags = 1; /* always auto-follow */
345 static int handle_config(const char *key, const char *value, void *cb)
347 const char *name;
348 const char *subkey;
349 struct remote *remote;
350 struct branch *branch;
351 if (!prefixcmp(key, "branch.")) {
352 name = key + 7;
353 subkey = strrchr(name, '.');
354 if (!subkey)
355 return 0;
356 branch = make_branch(name, subkey - name);
357 if (!strcmp(subkey, ".remote")) {
358 if (!value)
359 return config_error_nonbool(key);
360 branch->remote_name = xstrdup(value);
361 if (branch == current_branch) {
362 default_remote_name = branch->remote_name;
363 explicit_default_remote_name = 1;
365 } else if (!strcmp(subkey, ".merge")) {
366 if (!value)
367 return config_error_nonbool(key);
368 add_merge(branch, xstrdup(value));
370 return 0;
372 if (!prefixcmp(key, "url.")) {
373 struct rewrite *rewrite;
374 name = key + 4;
375 subkey = strrchr(name, '.');
376 if (!subkey)
377 return 0;
378 if (!strcmp(subkey, ".insteadof")) {
379 rewrite = make_rewrite(&rewrites, name, subkey - name);
380 if (!value)
381 return config_error_nonbool(key);
382 add_instead_of(rewrite, xstrdup(value));
383 } else if (!strcmp(subkey, ".pushinsteadof")) {
384 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
385 if (!value)
386 return config_error_nonbool(key);
387 add_instead_of(rewrite, xstrdup(value));
390 if (prefixcmp(key, "remote."))
391 return 0;
392 name = key + 7;
393 if (*name == '/') {
394 warning("Config remote shorthand cannot begin with '/': %s",
395 name);
396 return 0;
398 subkey = strrchr(name, '.');
399 if (!subkey)
400 return 0;
401 remote = make_remote(name, subkey - name);
402 remote->origin = REMOTE_CONFIG;
403 if (!strcmp(subkey, ".mirror"))
404 remote->mirror = git_config_bool(key, value);
405 else if (!strcmp(subkey, ".skipdefaultupdate"))
406 remote->skip_default_update = git_config_bool(key, value);
407 else if (!strcmp(subkey, ".skipfetchall"))
408 remote->skip_default_update = git_config_bool(key, value);
409 else if (!strcmp(subkey, ".url")) {
410 const char *v;
411 if (git_config_string(&v, key, value))
412 return -1;
413 add_url(remote, v);
414 } else if (!strcmp(subkey, ".pushurl")) {
415 const char *v;
416 if (git_config_string(&v, key, value))
417 return -1;
418 add_pushurl(remote, v);
419 } else if (!strcmp(subkey, ".push")) {
420 const char *v;
421 if (git_config_string(&v, key, value))
422 return -1;
423 add_push_refspec(remote, v);
424 } else if (!strcmp(subkey, ".fetch")) {
425 const char *v;
426 if (git_config_string(&v, key, value))
427 return -1;
428 add_fetch_refspec(remote, v);
429 } else if (!strcmp(subkey, ".receivepack")) {
430 const char *v;
431 if (git_config_string(&v, key, value))
432 return -1;
433 if (!remote->receivepack)
434 remote->receivepack = v;
435 else
436 error("more than one receivepack given, using the first");
437 } else if (!strcmp(subkey, ".uploadpack")) {
438 const char *v;
439 if (git_config_string(&v, key, value))
440 return -1;
441 if (!remote->uploadpack)
442 remote->uploadpack = v;
443 else
444 error("more than one uploadpack given, using the first");
445 } else if (!strcmp(subkey, ".tagopt")) {
446 if (!strcmp(value, "--no-tags"))
447 remote->fetch_tags = -1;
448 else if (!strcmp(value, "--tags"))
449 remote->fetch_tags = 2;
450 } else if (!strcmp(subkey, ".proxy")) {
451 return git_config_string((const char **)&remote->http_proxy,
452 key, value);
453 } else if (!strcmp(subkey, ".vcs")) {
454 return git_config_string(&remote->foreign_vcs, key, value);
456 return 0;
459 static void alias_all_urls(void)
461 int i, j;
462 for (i = 0; i < remotes_nr; i++) {
463 int add_pushurl_aliases;
464 if (!remotes[i])
465 continue;
466 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
467 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
469 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
470 for (j = 0; j < remotes[i]->url_nr; j++) {
471 if (add_pushurl_aliases)
472 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
473 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
478 static void read_config(void)
480 unsigned char sha1[20];
481 const char *head_ref;
482 int flag;
483 if (default_remote_name) /* did this already */
484 return;
485 default_remote_name = xstrdup("origin");
486 current_branch = NULL;
487 head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
488 if (head_ref && (flag & REF_ISSYMREF) &&
489 !prefixcmp(head_ref, "refs/heads/")) {
490 current_branch =
491 make_branch(head_ref + strlen("refs/heads/"), 0);
493 git_config(handle_config, NULL);
494 alias_all_urls();
498 * This function frees a refspec array.
499 * Warning: code paths should be checked to ensure that the src
500 * and dst pointers are always freeable pointers as well
501 * as the refspec pointer itself.
503 static void free_refspecs(struct refspec *refspec, int nr_refspec)
505 int i;
507 if (!refspec)
508 return;
510 for (i = 0; i < nr_refspec; i++) {
511 free(refspec[i].src);
512 free(refspec[i].dst);
514 free(refspec);
517 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
519 int i;
520 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
522 for (i = 0; i < nr_refspec; i++) {
523 size_t llen;
524 int is_glob;
525 const char *lhs, *rhs;
526 int flags;
528 is_glob = 0;
530 lhs = refspec[i];
531 if (*lhs == '+') {
532 rs[i].force = 1;
533 lhs++;
536 rhs = strrchr(lhs, ':');
539 * Before going on, special case ":" (or "+:") as a refspec
540 * for matching refs.
542 if (!fetch && rhs == lhs && rhs[1] == '\0') {
543 rs[i].matching = 1;
544 continue;
547 if (rhs) {
548 size_t rlen = strlen(++rhs);
549 is_glob = (1 <= rlen && strchr(rhs, '*'));
550 rs[i].dst = xstrndup(rhs, rlen);
553 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
554 if (1 <= llen && memchr(lhs, '*', llen)) {
555 if ((rhs && !is_glob) || (!rhs && fetch))
556 goto invalid;
557 is_glob = 1;
558 } else if (rhs && is_glob) {
559 goto invalid;
562 rs[i].pattern = is_glob;
563 rs[i].src = xstrndup(lhs, llen);
564 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
566 if (fetch) {
568 * LHS
569 * - empty is allowed; it means HEAD.
570 * - otherwise it must be a valid looking ref.
572 if (!*rs[i].src)
573 ; /* empty is ok */
574 else if (check_refname_format(rs[i].src, flags))
575 goto invalid;
577 * RHS
578 * - missing is ok, and is same as empty.
579 * - empty is ok; it means not to store.
580 * - otherwise it must be a valid looking ref.
582 if (!rs[i].dst)
583 ; /* ok */
584 else if (!*rs[i].dst)
585 ; /* ok */
586 else if (check_refname_format(rs[i].dst, flags))
587 goto invalid;
588 } else {
590 * LHS
591 * - empty is allowed; it means delete.
592 * - when wildcarded, it must be a valid looking ref.
593 * - otherwise, it must be an extended SHA-1, but
594 * there is no existing way to validate this.
596 if (!*rs[i].src)
597 ; /* empty is ok */
598 else if (is_glob) {
599 if (check_refname_format(rs[i].src, flags))
600 goto invalid;
602 else
603 ; /* anything goes, for now */
605 * RHS
606 * - missing is allowed, but LHS then must be a
607 * valid looking ref.
608 * - empty is not allowed.
609 * - otherwise it must be a valid looking ref.
611 if (!rs[i].dst) {
612 if (check_refname_format(rs[i].src, flags))
613 goto invalid;
614 } else if (!*rs[i].dst) {
615 goto invalid;
616 } else {
617 if (check_refname_format(rs[i].dst, flags))
618 goto invalid;
622 return rs;
624 invalid:
625 if (verify) {
627 * nr_refspec must be greater than zero and i must be valid
628 * since it is only possible to reach this point from within
629 * the for loop above.
631 free_refspecs(rs, i+1);
632 return NULL;
634 die("Invalid refspec '%s'", refspec[i]);
637 int valid_fetch_refspec(const char *fetch_refspec_str)
639 struct refspec *refspec;
641 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
642 free_refspecs(refspec, 1);
643 return !!refspec;
646 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
648 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
651 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
653 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
656 void free_refspec(int nr_refspec, struct refspec *refspec)
658 int i;
659 for (i = 0; i < nr_refspec; i++) {
660 free(refspec[i].src);
661 free(refspec[i].dst);
663 free(refspec);
666 static int valid_remote_nick(const char *name)
668 if (!name[0] || is_dot_or_dotdot(name))
669 return 0;
670 return !strchr(name, '/'); /* no slash */
673 struct remote *remote_get(const char *name)
675 struct remote *ret;
676 int name_given = 0;
678 read_config();
679 if (name)
680 name_given = 1;
681 else {
682 name = default_remote_name;
683 name_given = explicit_default_remote_name;
686 ret = make_remote(name, 0);
687 if (valid_remote_nick(name)) {
688 if (!valid_remote(ret))
689 read_remotes_file(ret);
690 if (!valid_remote(ret))
691 read_branches_file(ret);
693 if (name_given && !valid_remote(ret))
694 add_url_alias(ret, name);
695 if (!valid_remote(ret))
696 return NULL;
697 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
698 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
699 return ret;
702 int remote_is_configured(const char *name)
704 int i;
705 read_config();
707 for (i = 0; i < remotes_nr; i++)
708 if (!strcmp(name, remotes[i]->name))
709 return 1;
710 return 0;
713 int for_each_remote(each_remote_fn fn, void *priv)
715 int i, result = 0;
716 read_config();
717 for (i = 0; i < remotes_nr && !result; i++) {
718 struct remote *r = remotes[i];
719 if (!r)
720 continue;
721 if (!r->fetch)
722 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
723 r->fetch_refspec);
724 if (!r->push)
725 r->push = parse_push_refspec(r->push_refspec_nr,
726 r->push_refspec);
727 result = fn(r, priv);
729 return result;
732 void ref_remove_duplicates(struct ref *ref_map)
734 struct string_list refs = STRING_LIST_INIT_NODUP;
735 struct string_list_item *item = NULL;
736 struct ref *prev = NULL, *next = NULL;
737 for (; ref_map; prev = ref_map, ref_map = next) {
738 next = ref_map->next;
739 if (!ref_map->peer_ref)
740 continue;
742 item = string_list_lookup(&refs, ref_map->peer_ref->name);
743 if (item) {
744 if (strcmp(((struct ref *)item->util)->name,
745 ref_map->name))
746 die("%s tracks both %s and %s",
747 ref_map->peer_ref->name,
748 ((struct ref *)item->util)->name,
749 ref_map->name);
750 prev->next = ref_map->next;
751 free(ref_map->peer_ref);
752 free(ref_map);
753 ref_map = prev; /* skip this; we freed it */
754 continue;
757 item = string_list_insert(&refs, ref_map->peer_ref->name);
758 item->util = ref_map;
760 string_list_clear(&refs, 0);
763 int remote_has_url(struct remote *remote, const char *url)
765 int i;
766 for (i = 0; i < remote->url_nr; i++) {
767 if (!strcmp(remote->url[i], url))
768 return 1;
770 return 0;
773 static int match_name_with_pattern(const char *key, const char *name,
774 const char *value, char **result)
776 const char *kstar = strchr(key, '*');
777 size_t klen;
778 size_t ksuffixlen;
779 size_t namelen;
780 int ret;
781 if (!kstar)
782 die("Key '%s' of pattern had no '*'", key);
783 klen = kstar - key;
784 ksuffixlen = strlen(kstar + 1);
785 namelen = strlen(name);
786 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
787 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
788 if (ret && value) {
789 const char *vstar = strchr(value, '*');
790 size_t vlen;
791 size_t vsuffixlen;
792 if (!vstar)
793 die("Value '%s' of pattern has no '*'", value);
794 vlen = vstar - value;
795 vsuffixlen = strlen(vstar + 1);
796 *result = xmalloc(vlen + vsuffixlen +
797 strlen(name) -
798 klen - ksuffixlen + 1);
799 strncpy(*result, value, vlen);
800 strncpy(*result + vlen,
801 name + klen, namelen - klen - ksuffixlen);
802 strcpy(*result + vlen + namelen - klen - ksuffixlen,
803 vstar + 1);
805 return ret;
808 static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
810 int i;
811 int find_src = !query->src;
813 if (find_src && !query->dst)
814 return error("query_refspecs: need either src or dst");
816 for (i = 0; i < ref_count; i++) {
817 struct refspec *refspec = &refs[i];
818 const char *key = find_src ? refspec->dst : refspec->src;
819 const char *value = find_src ? refspec->src : refspec->dst;
820 const char *needle = find_src ? query->dst : query->src;
821 char **result = find_src ? &query->src : &query->dst;
823 if (!refspec->dst)
824 continue;
825 if (refspec->pattern) {
826 if (match_name_with_pattern(key, needle, value, result)) {
827 query->force = refspec->force;
828 return 0;
830 } else if (!strcmp(needle, key)) {
831 *result = xstrdup(value);
832 query->force = refspec->force;
833 return 0;
836 return -1;
839 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
840 const char *name)
842 struct refspec query;
844 memset(&query, 0, sizeof(struct refspec));
845 query.src = (char *)name;
847 if (query_refspecs(refspecs, nr_refspec, &query))
848 return NULL;
850 return query.dst;
853 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
855 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
858 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
859 const char *name)
861 size_t len = strlen(name);
862 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
863 memcpy(ref->name, prefix, prefixlen);
864 memcpy(ref->name + prefixlen, name, len);
865 return ref;
868 struct ref *alloc_ref(const char *name)
870 return alloc_ref_with_prefix("", 0, name);
873 struct ref *copy_ref(const struct ref *ref)
875 struct ref *cpy;
876 size_t len;
877 if (!ref)
878 return NULL;
879 len = strlen(ref->name);
880 cpy = xmalloc(sizeof(struct ref) + len + 1);
881 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
882 cpy->next = NULL;
883 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
884 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
885 cpy->peer_ref = copy_ref(ref->peer_ref);
886 return cpy;
889 struct ref *copy_ref_list(const struct ref *ref)
891 struct ref *ret = NULL;
892 struct ref **tail = &ret;
893 while (ref) {
894 *tail = copy_ref(ref);
895 ref = ref->next;
896 tail = &((*tail)->next);
898 return ret;
901 static void free_ref(struct ref *ref)
903 if (!ref)
904 return;
905 free_ref(ref->peer_ref);
906 free(ref->remote_status);
907 free(ref->symref);
908 free(ref);
911 void free_refs(struct ref *ref)
913 struct ref *next;
914 while (ref) {
915 next = ref->next;
916 free_ref(ref);
917 ref = next;
921 static int count_refspec_match(const char *pattern,
922 struct ref *refs,
923 struct ref **matched_ref)
925 int patlen = strlen(pattern);
926 struct ref *matched_weak = NULL;
927 struct ref *matched = NULL;
928 int weak_match = 0;
929 int match = 0;
931 for (weak_match = match = 0; refs; refs = refs->next) {
932 char *name = refs->name;
933 int namelen = strlen(name);
935 if (!refname_match(pattern, name, ref_rev_parse_rules))
936 continue;
938 /* A match is "weak" if it is with refs outside
939 * heads or tags, and did not specify the pattern
940 * in full (e.g. "refs/remotes/origin/master") or at
941 * least from the toplevel (e.g. "remotes/origin/master");
942 * otherwise "git push $URL master" would result in
943 * ambiguity between remotes/origin/master and heads/master
944 * at the remote site.
946 if (namelen != patlen &&
947 patlen != namelen - 5 &&
948 prefixcmp(name, "refs/heads/") &&
949 prefixcmp(name, "refs/tags/")) {
950 /* We want to catch the case where only weak
951 * matches are found and there are multiple
952 * matches, and where more than one strong
953 * matches are found, as ambiguous. One
954 * strong match with zero or more weak matches
955 * are acceptable as a unique match.
957 matched_weak = refs;
958 weak_match++;
960 else {
961 matched = refs;
962 match++;
965 if (!matched) {
966 *matched_ref = matched_weak;
967 return weak_match;
969 else {
970 *matched_ref = matched;
971 return match;
975 static void tail_link_ref(struct ref *ref, struct ref ***tail)
977 **tail = ref;
978 while (ref->next)
979 ref = ref->next;
980 *tail = &ref->next;
983 static struct ref *alloc_delete_ref(void)
985 struct ref *ref = alloc_ref("(delete)");
986 hashclr(ref->new_sha1);
987 return ref;
990 static struct ref *try_explicit_object_name(const char *name)
992 unsigned char sha1[20];
993 struct ref *ref;
995 if (!*name)
996 return alloc_delete_ref();
997 if (get_sha1(name, sha1))
998 return NULL;
999 ref = alloc_ref(name);
1000 hashcpy(ref->new_sha1, sha1);
1001 return ref;
1004 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1006 struct ref *ret = alloc_ref(name);
1007 tail_link_ref(ret, tail);
1008 return ret;
1011 static char *guess_ref(const char *name, struct ref *peer)
1013 struct strbuf buf = STRBUF_INIT;
1014 unsigned char sha1[20];
1016 const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1017 if (!r)
1018 return NULL;
1020 if (!prefixcmp(r, "refs/heads/"))
1021 strbuf_addstr(&buf, "refs/heads/");
1022 else if (!prefixcmp(r, "refs/tags/"))
1023 strbuf_addstr(&buf, "refs/tags/");
1024 else
1025 return NULL;
1027 strbuf_addstr(&buf, name);
1028 return strbuf_detach(&buf, NULL);
1031 static int match_explicit(struct ref *src, struct ref *dst,
1032 struct ref ***dst_tail,
1033 struct refspec *rs)
1035 struct ref *matched_src, *matched_dst;
1036 int copy_src;
1038 const char *dst_value = rs->dst;
1039 char *dst_guess;
1041 if (rs->pattern || rs->matching)
1042 return 0;
1044 matched_src = matched_dst = NULL;
1045 switch (count_refspec_match(rs->src, src, &matched_src)) {
1046 case 1:
1047 copy_src = 1;
1048 break;
1049 case 0:
1050 /* The source could be in the get_sha1() format
1051 * not a reference name. :refs/other is a
1052 * way to delete 'other' ref at the remote end.
1054 matched_src = try_explicit_object_name(rs->src);
1055 if (!matched_src)
1056 return error("src refspec %s does not match any.", rs->src);
1057 copy_src = 0;
1058 break;
1059 default:
1060 return error("src refspec %s matches more than one.", rs->src);
1063 if (!dst_value) {
1064 unsigned char sha1[20];
1065 int flag;
1067 dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1068 if (!dst_value ||
1069 ((flag & REF_ISSYMREF) &&
1070 prefixcmp(dst_value, "refs/heads/")))
1071 die("%s cannot be resolved to branch.",
1072 matched_src->name);
1075 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1076 case 1:
1077 break;
1078 case 0:
1079 if (!memcmp(dst_value, "refs/", 5))
1080 matched_dst = make_linked_ref(dst_value, dst_tail);
1081 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1082 matched_dst = make_linked_ref(dst_guess, dst_tail);
1083 else
1084 error("unable to push to unqualified destination: %s\n"
1085 "The destination refspec neither matches an "
1086 "existing ref on the remote nor\n"
1087 "begins with refs/, and we are unable to "
1088 "guess a prefix based on the source ref.",
1089 dst_value);
1090 break;
1091 default:
1092 matched_dst = NULL;
1093 error("dst refspec %s matches more than one.",
1094 dst_value);
1095 break;
1097 if (!matched_dst)
1098 return -1;
1099 if (matched_dst->peer_ref)
1100 return error("dst ref %s receives from more than one src.",
1101 matched_dst->name);
1102 else {
1103 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1104 matched_dst->force = rs->force;
1106 return 0;
1109 static int match_explicit_refs(struct ref *src, struct ref *dst,
1110 struct ref ***dst_tail, struct refspec *rs,
1111 int rs_nr)
1113 int i, errs;
1114 for (i = errs = 0; i < rs_nr; i++)
1115 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1116 return errs;
1119 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1120 int send_mirror, int direction, const struct refspec **ret_pat)
1122 const struct refspec *pat;
1123 char *name;
1124 int i;
1125 int matching_refs = -1;
1126 for (i = 0; i < rs_nr; i++) {
1127 if (rs[i].matching &&
1128 (matching_refs == -1 || rs[i].force)) {
1129 matching_refs = i;
1130 continue;
1133 if (rs[i].pattern) {
1134 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1135 int match;
1136 if (direction == FROM_SRC)
1137 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1138 else
1139 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1140 if (match) {
1141 matching_refs = i;
1142 break;
1146 if (matching_refs == -1)
1147 return NULL;
1149 pat = rs + matching_refs;
1150 if (pat->matching) {
1152 * "matching refs"; traditionally we pushed everything
1153 * including refs outside refs/heads/ hierarchy, but
1154 * that does not make much sense these days.
1156 if (!send_mirror && prefixcmp(ref->name, "refs/heads/"))
1157 return NULL;
1158 name = xstrdup(ref->name);
1160 if (ret_pat)
1161 *ret_pat = pat;
1162 return name;
1165 static struct ref **tail_ref(struct ref **head)
1167 struct ref **tail = head;
1168 while (*tail)
1169 tail = &((*tail)->next);
1170 return tail;
1174 * Given the set of refs the local repository has, the set of refs the
1175 * remote repository has, and the refspec used for push, determine
1176 * what remote refs we will update and with what value by setting
1177 * peer_ref (which object is being pushed) and force (if the push is
1178 * forced) in elements of "dst". The function may add new elements to
1179 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1181 int match_push_refs(struct ref *src, struct ref **dst,
1182 int nr_refspec, const char **refspec, int flags)
1184 struct refspec *rs;
1185 int send_all = flags & MATCH_REFS_ALL;
1186 int send_mirror = flags & MATCH_REFS_MIRROR;
1187 int send_prune = flags & MATCH_REFS_PRUNE;
1188 int errs;
1189 static const char *default_refspec[] = { ":", NULL };
1190 struct ref *ref, **dst_tail = tail_ref(dst);
1192 if (!nr_refspec) {
1193 nr_refspec = 1;
1194 refspec = default_refspec;
1196 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1197 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1199 /* pick the remainder */
1200 for (ref = src; ref; ref = ref->next) {
1201 struct ref *dst_peer;
1202 const struct refspec *pat = NULL;
1203 char *dst_name;
1205 if (ref->peer_ref)
1206 continue;
1208 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1209 if (!dst_name)
1210 continue;
1212 dst_peer = find_ref_by_name(*dst, dst_name);
1213 if (dst_peer) {
1214 if (dst_peer->peer_ref)
1215 /* We're already sending something to this ref. */
1216 goto free_name;
1217 } else {
1218 if (pat->matching && !(send_all || send_mirror))
1220 * Remote doesn't have it, and we have no
1221 * explicit pattern, and we don't have
1222 * --all nor --mirror.
1224 goto free_name;
1226 /* Create a new one and link it */
1227 dst_peer = make_linked_ref(dst_name, &dst_tail);
1228 hashcpy(dst_peer->new_sha1, ref->new_sha1);
1230 dst_peer->peer_ref = copy_ref(ref);
1231 dst_peer->force = pat->force;
1232 free_name:
1233 free(dst_name);
1235 if (send_prune) {
1236 /* check for missing refs on the remote */
1237 for (ref = *dst; ref; ref = ref->next) {
1238 char *src_name;
1240 if (ref->peer_ref)
1241 /* We're already sending something to this ref. */
1242 continue;
1244 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1245 if (src_name) {
1246 if (!find_ref_by_name(src, src_name))
1247 ref->peer_ref = alloc_delete_ref();
1248 free(src_name);
1252 if (errs)
1253 return -1;
1254 return 0;
1257 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1258 int force_update)
1260 struct ref *ref;
1262 for (ref = remote_refs; ref; ref = ref->next) {
1263 if (ref->peer_ref)
1264 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1265 else if (!send_mirror)
1266 continue;
1268 ref->deletion = is_null_sha1(ref->new_sha1);
1269 if (!ref->deletion &&
1270 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1271 ref->status = REF_STATUS_UPTODATE;
1272 continue;
1275 /* This part determines what can overwrite what.
1276 * The rules are:
1278 * (0) you can always use --force or +A:B notation to
1279 * selectively force individual ref pairs.
1281 * (1) if the old thing does not exist, it is OK.
1283 * (2) if you do not have the old thing, you are not allowed
1284 * to overwrite it; you would not know what you are losing
1285 * otherwise.
1287 * (3) if both new and old are commit-ish, and new is a
1288 * descendant of old, it is OK.
1290 * (4) regardless of all of the above, removing :B is
1291 * always allowed.
1294 ref->nonfastforward =
1295 !ref->deletion &&
1296 !is_null_sha1(ref->old_sha1) &&
1297 (!has_sha1_file(ref->old_sha1)
1298 || !ref_newer(ref->new_sha1, ref->old_sha1));
1300 if (ref->nonfastforward && !ref->force && !force_update) {
1301 ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
1302 continue;
1307 struct branch *branch_get(const char *name)
1309 struct branch *ret;
1311 read_config();
1312 if (!name || !*name || !strcmp(name, "HEAD"))
1313 ret = current_branch;
1314 else
1315 ret = make_branch(name, 0);
1316 if (ret && ret->remote_name) {
1317 ret->remote = remote_get(ret->remote_name);
1318 if (ret->merge_nr) {
1319 int i;
1320 ret->merge = xcalloc(sizeof(*ret->merge),
1321 ret->merge_nr);
1322 for (i = 0; i < ret->merge_nr; i++) {
1323 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1324 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1325 if (remote_find_tracking(ret->remote, ret->merge[i])
1326 && !strcmp(ret->remote_name, "."))
1327 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1331 return ret;
1334 int branch_has_merge_config(struct branch *branch)
1336 return branch && !!branch->merge;
1339 int branch_merge_matches(struct branch *branch,
1340 int i,
1341 const char *refname)
1343 if (!branch || i < 0 || i >= branch->merge_nr)
1344 return 0;
1345 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1348 static struct ref *get_expanded_map(const struct ref *remote_refs,
1349 const struct refspec *refspec)
1351 const struct ref *ref;
1352 struct ref *ret = NULL;
1353 struct ref **tail = &ret;
1355 char *expn_name;
1357 for (ref = remote_refs; ref; ref = ref->next) {
1358 if (strchr(ref->name, '^'))
1359 continue; /* a dereference item */
1360 if (match_name_with_pattern(refspec->src, ref->name,
1361 refspec->dst, &expn_name)) {
1362 struct ref *cpy = copy_ref(ref);
1364 cpy->peer_ref = alloc_ref(expn_name);
1365 free(expn_name);
1366 if (refspec->force)
1367 cpy->peer_ref->force = 1;
1368 *tail = cpy;
1369 tail = &cpy->next;
1373 return ret;
1376 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1378 const struct ref *ref;
1379 for (ref = refs; ref; ref = ref->next) {
1380 if (refname_match(name, ref->name, ref_fetch_rules))
1381 return ref;
1383 return NULL;
1386 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1388 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1390 if (!ref)
1391 return NULL;
1393 return copy_ref(ref);
1396 static struct ref *get_local_ref(const char *name)
1398 if (!name || name[0] == '\0')
1399 return NULL;
1401 if (!prefixcmp(name, "refs/"))
1402 return alloc_ref(name);
1404 if (!prefixcmp(name, "heads/") ||
1405 !prefixcmp(name, "tags/") ||
1406 !prefixcmp(name, "remotes/"))
1407 return alloc_ref_with_prefix("refs/", 5, name);
1409 return alloc_ref_with_prefix("refs/heads/", 11, name);
1412 int get_fetch_map(const struct ref *remote_refs,
1413 const struct refspec *refspec,
1414 struct ref ***tail,
1415 int missing_ok)
1417 struct ref *ref_map, **rmp;
1419 if (refspec->pattern) {
1420 ref_map = get_expanded_map(remote_refs, refspec);
1421 } else {
1422 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1424 ref_map = get_remote_ref(remote_refs, name);
1425 if (!missing_ok && !ref_map)
1426 die("Couldn't find remote ref %s", name);
1427 if (ref_map) {
1428 ref_map->peer_ref = get_local_ref(refspec->dst);
1429 if (ref_map->peer_ref && refspec->force)
1430 ref_map->peer_ref->force = 1;
1434 for (rmp = &ref_map; *rmp; ) {
1435 if ((*rmp)->peer_ref) {
1436 if (check_refname_format((*rmp)->peer_ref->name + 5,
1437 REFNAME_ALLOW_ONELEVEL)) {
1438 struct ref *ignore = *rmp;
1439 error("* Ignoring funny ref '%s' locally",
1440 (*rmp)->peer_ref->name);
1441 *rmp = (*rmp)->next;
1442 free(ignore->peer_ref);
1443 free(ignore);
1444 continue;
1447 rmp = &((*rmp)->next);
1450 if (ref_map)
1451 tail_link_ref(ref_map, tail);
1453 return 0;
1456 int resolve_remote_symref(struct ref *ref, struct ref *list)
1458 if (!ref->symref)
1459 return 0;
1460 for (; list; list = list->next)
1461 if (!strcmp(ref->symref, list->name)) {
1462 hashcpy(ref->old_sha1, list->old_sha1);
1463 return 0;
1465 return 1;
1468 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1470 while (list) {
1471 struct commit_list *temp = list;
1472 temp->item->object.flags &= ~mark;
1473 list = temp->next;
1474 free(temp);
1478 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1480 struct object *o;
1481 struct commit *old, *new;
1482 struct commit_list *list, *used;
1483 int found = 0;
1485 /* Both new and old must be commit-ish and new is descendant of
1486 * old. Otherwise we require --force.
1488 o = deref_tag(parse_object(old_sha1), NULL, 0);
1489 if (!o || o->type != OBJ_COMMIT)
1490 return 0;
1491 old = (struct commit *) o;
1493 o = deref_tag(parse_object(new_sha1), NULL, 0);
1494 if (!o || o->type != OBJ_COMMIT)
1495 return 0;
1496 new = (struct commit *) o;
1498 if (parse_commit(new) < 0)
1499 return 0;
1501 used = list = NULL;
1502 commit_list_insert(new, &list);
1503 while (list) {
1504 new = pop_most_recent_commit(&list, TMP_MARK);
1505 commit_list_insert(new, &used);
1506 if (new == old) {
1507 found = 1;
1508 break;
1511 unmark_and_free(list, TMP_MARK);
1512 unmark_and_free(used, TMP_MARK);
1513 return found;
1517 * Return true if there is anything to report, otherwise false.
1519 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1521 unsigned char sha1[20];
1522 struct commit *ours, *theirs;
1523 char symmetric[84];
1524 struct rev_info revs;
1525 const char *rev_argv[10], *base;
1526 int rev_argc;
1529 * Nothing to report unless we are marked to build on top of
1530 * somebody else.
1532 if (!branch ||
1533 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1534 return 0;
1537 * If what we used to build on no longer exists, there is
1538 * nothing to report.
1540 base = branch->merge[0]->dst;
1541 if (read_ref(base, sha1))
1542 return 0;
1543 theirs = lookup_commit_reference(sha1);
1544 if (!theirs)
1545 return 0;
1547 if (read_ref(branch->refname, sha1))
1548 return 0;
1549 ours = lookup_commit_reference(sha1);
1550 if (!ours)
1551 return 0;
1553 /* are we the same? */
1554 if (theirs == ours)
1555 return 0;
1557 /* Run "rev-list --left-right ours...theirs" internally... */
1558 rev_argc = 0;
1559 rev_argv[rev_argc++] = NULL;
1560 rev_argv[rev_argc++] = "--left-right";
1561 rev_argv[rev_argc++] = symmetric;
1562 rev_argv[rev_argc++] = "--";
1563 rev_argv[rev_argc] = NULL;
1565 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1566 strcpy(symmetric + 40, "...");
1567 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1569 init_revisions(&revs, NULL);
1570 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1571 prepare_revision_walk(&revs);
1573 /* ... and count the commits on each side. */
1574 *num_ours = 0;
1575 *num_theirs = 0;
1576 while (1) {
1577 struct commit *c = get_revision(&revs);
1578 if (!c)
1579 break;
1580 if (c->object.flags & SYMMETRIC_LEFT)
1581 (*num_ours)++;
1582 else
1583 (*num_theirs)++;
1586 /* clear object flags smudged by the above traversal */
1587 clear_commit_marks(ours, ALL_REV_FLAGS);
1588 clear_commit_marks(theirs, ALL_REV_FLAGS);
1589 return 1;
1593 * Return true when there is anything to report, otherwise false.
1595 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1597 int num_ours, num_theirs;
1598 const char *base;
1600 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1601 return 0;
1603 base = branch->merge[0]->dst;
1604 base = shorten_unambiguous_ref(base, 0);
1605 if (!num_theirs)
1606 strbuf_addf(sb,
1607 Q_("Your branch is ahead of '%s' by %d commit.\n",
1608 "Your branch is ahead of '%s' by %d commits.\n",
1609 num_ours),
1610 base, num_ours);
1611 else if (!num_ours)
1612 strbuf_addf(sb,
1613 Q_("Your branch is behind '%s' by %d commit, "
1614 "and can be fast-forwarded.\n",
1615 "Your branch is behind '%s' by %d commits, "
1616 "and can be fast-forwarded.\n",
1617 num_theirs),
1618 base, num_theirs);
1619 else
1620 strbuf_addf(sb,
1621 Q_("Your branch and '%s' have diverged,\n"
1622 "and have %d and %d different commit each, "
1623 "respectively.\n",
1624 "Your branch and '%s' have diverged,\n"
1625 "and have %d and %d different commits each, "
1626 "respectively.\n",
1627 num_theirs),
1628 base, num_ours, num_theirs);
1629 return 1;
1632 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1634 struct ref ***local_tail = cb_data;
1635 struct ref *ref;
1636 int len;
1638 /* we already know it starts with refs/ to get here */
1639 if (check_refname_format(refname + 5, 0))
1640 return 0;
1642 len = strlen(refname) + 1;
1643 ref = xcalloc(1, sizeof(*ref) + len);
1644 hashcpy(ref->new_sha1, sha1);
1645 memcpy(ref->name, refname, len);
1646 **local_tail = ref;
1647 *local_tail = &ref->next;
1648 return 0;
1651 struct ref *get_local_heads(void)
1653 struct ref *local_refs = NULL, **local_tail = &local_refs;
1654 for_each_ref(one_local_ref, &local_tail);
1655 return local_refs;
1658 struct ref *guess_remote_head(const struct ref *head,
1659 const struct ref *refs,
1660 int all)
1662 const struct ref *r;
1663 struct ref *list = NULL;
1664 struct ref **tail = &list;
1666 if (!head)
1667 return NULL;
1670 * Some transports support directly peeking at
1671 * where HEAD points; if that is the case, then
1672 * we don't have to guess.
1674 if (head->symref)
1675 return copy_ref(find_ref_by_name(refs, head->symref));
1677 /* If refs/heads/master could be right, it is. */
1678 if (!all) {
1679 r = find_ref_by_name(refs, "refs/heads/master");
1680 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1681 return copy_ref(r);
1684 /* Look for another ref that points there */
1685 for (r = refs; r; r = r->next) {
1686 if (r != head &&
1687 !prefixcmp(r->name, "refs/heads/") &&
1688 !hashcmp(r->old_sha1, head->old_sha1)) {
1689 *tail = copy_ref(r);
1690 tail = &((*tail)->next);
1691 if (!all)
1692 break;
1696 return list;
1699 struct stale_heads_info {
1700 struct string_list *ref_names;
1701 struct ref **stale_refs_tail;
1702 struct refspec *refs;
1703 int ref_count;
1706 static int get_stale_heads_cb(const char *refname,
1707 const unsigned char *sha1, int flags, void *cb_data)
1709 struct stale_heads_info *info = cb_data;
1710 struct refspec query;
1711 memset(&query, 0, sizeof(struct refspec));
1712 query.dst = (char *)refname;
1714 if (query_refspecs(info->refs, info->ref_count, &query))
1715 return 0; /* No matches */
1718 * If we did find a suitable refspec and it's not a symref and
1719 * it's not in the list of refs that currently exist in that
1720 * remote we consider it to be stale.
1722 if (!((flags & REF_ISSYMREF) ||
1723 string_list_has_string(info->ref_names, query.src))) {
1724 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1725 hashcpy(ref->new_sha1, sha1);
1728 free(query.src);
1729 return 0;
1732 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
1734 struct ref *ref, *stale_refs = NULL;
1735 struct string_list ref_names = STRING_LIST_INIT_NODUP;
1736 struct stale_heads_info info;
1737 info.ref_names = &ref_names;
1738 info.stale_refs_tail = &stale_refs;
1739 info.refs = refs;
1740 info.ref_count = ref_count;
1741 for (ref = fetch_map; ref; ref = ref->next)
1742 string_list_append(&ref_names, ref->name);
1743 sort_string_list(&ref_names);
1744 for_each_ref(get_stale_heads_cb, &info);
1745 string_list_clear(&ref_names, 0);
1746 return stale_refs;