Merge branch 'rj/maint-t9700'
[git/vmiklos.git] / remote.c
blobe0d17bb83060561c17114905c253eebdf925a01c
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 const char *alias_url(const char *url, struct rewrites *r)
58 int i, j;
59 char *ret;
60 struct counted_string *longest;
61 int longest_i;
63 longest = NULL;
64 longest_i = -1;
65 for (i = 0; i < r->rewrite_nr; i++) {
66 if (!r->rewrite[i])
67 continue;
68 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
69 if (!prefixcmp(url, r->rewrite[i]->instead_of[j].s) &&
70 (!longest ||
71 longest->len < r->rewrite[i]->instead_of[j].len)) {
72 longest = &(r->rewrite[i]->instead_of[j]);
73 longest_i = i;
77 if (!longest)
78 return url;
80 ret = xmalloc(r->rewrite[longest_i]->baselen +
81 (strlen(url) - longest->len) + 1);
82 strcpy(ret, r->rewrite[longest_i]->base);
83 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
84 return ret;
87 static void add_push_refspec(struct remote *remote, const char *ref)
89 ALLOC_GROW(remote->push_refspec,
90 remote->push_refspec_nr + 1,
91 remote->push_refspec_alloc);
92 remote->push_refspec[remote->push_refspec_nr++] = ref;
95 static void add_fetch_refspec(struct remote *remote, const char *ref)
97 ALLOC_GROW(remote->fetch_refspec,
98 remote->fetch_refspec_nr + 1,
99 remote->fetch_refspec_alloc);
100 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
103 static void add_url(struct remote *remote, const char *url)
105 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
106 remote->url[remote->url_nr++] = url;
109 static void add_pushurl(struct remote *remote, const char *pushurl)
111 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
112 remote->pushurl[remote->pushurl_nr++] = pushurl;
115 static void add_pushurl_alias(struct remote *remote, const char *url)
117 const char *pushurl = alias_url(url, &rewrites_push);
118 if (pushurl != url)
119 add_pushurl(remote, pushurl);
122 static void add_url_alias(struct remote *remote, const char *url)
124 add_url(remote, alias_url(url, &rewrites));
125 add_pushurl_alias(remote, url);
128 static struct remote *make_remote(const char *name, int len)
130 struct remote *ret;
131 int i;
133 for (i = 0; i < remotes_nr; i++) {
134 if (len ? (!strncmp(name, remotes[i]->name, len) &&
135 !remotes[i]->name[len]) :
136 !strcmp(name, remotes[i]->name))
137 return remotes[i];
140 ret = xcalloc(1, sizeof(struct remote));
141 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
142 remotes[remotes_nr++] = ret;
143 if (len)
144 ret->name = xstrndup(name, len);
145 else
146 ret->name = xstrdup(name);
147 return ret;
150 static void add_merge(struct branch *branch, const char *name)
152 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
153 branch->merge_alloc);
154 branch->merge_name[branch->merge_nr++] = name;
157 static struct branch *make_branch(const char *name, int len)
159 struct branch *ret;
160 int i;
161 char *refname;
163 for (i = 0; i < branches_nr; i++) {
164 if (len ? (!strncmp(name, branches[i]->name, len) &&
165 !branches[i]->name[len]) :
166 !strcmp(name, branches[i]->name))
167 return branches[i];
170 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
171 ret = xcalloc(1, sizeof(struct branch));
172 branches[branches_nr++] = ret;
173 if (len)
174 ret->name = xstrndup(name, len);
175 else
176 ret->name = xstrdup(name);
177 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
178 strcpy(refname, "refs/heads/");
179 strcpy(refname + strlen("refs/heads/"), ret->name);
180 ret->refname = refname;
182 return ret;
185 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
187 struct rewrite *ret;
188 int i;
190 for (i = 0; i < r->rewrite_nr; i++) {
191 if (len
192 ? (len == r->rewrite[i]->baselen &&
193 !strncmp(base, r->rewrite[i]->base, len))
194 : !strcmp(base, r->rewrite[i]->base))
195 return r->rewrite[i];
198 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
199 ret = xcalloc(1, sizeof(struct rewrite));
200 r->rewrite[r->rewrite_nr++] = ret;
201 if (len) {
202 ret->base = xstrndup(base, len);
203 ret->baselen = len;
205 else {
206 ret->base = xstrdup(base);
207 ret->baselen = strlen(base);
209 return ret;
212 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
214 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
215 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
216 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
217 rewrite->instead_of_nr++;
220 static void read_remotes_file(struct remote *remote)
222 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
224 if (!f)
225 return;
226 remote->origin = REMOTE_REMOTES;
227 while (fgets(buffer, BUF_SIZE, f)) {
228 int value_list;
229 char *s, *p;
231 if (!prefixcmp(buffer, "URL:")) {
232 value_list = 0;
233 s = buffer + 4;
234 } else if (!prefixcmp(buffer, "Push:")) {
235 value_list = 1;
236 s = buffer + 5;
237 } else if (!prefixcmp(buffer, "Pull:")) {
238 value_list = 2;
239 s = buffer + 5;
240 } else
241 continue;
243 while (isspace(*s))
244 s++;
245 if (!*s)
246 continue;
248 p = s + strlen(s);
249 while (isspace(p[-1]))
250 *--p = 0;
252 switch (value_list) {
253 case 0:
254 add_url_alias(remote, xstrdup(s));
255 break;
256 case 1:
257 add_push_refspec(remote, xstrdup(s));
258 break;
259 case 2:
260 add_fetch_refspec(remote, xstrdup(s));
261 break;
264 fclose(f);
267 static void read_branches_file(struct remote *remote)
269 const char *slash = strchr(remote->name, '/');
270 char *frag;
271 struct strbuf branch = STRBUF_INIT;
272 int n = slash ? slash - remote->name : 1000;
273 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
274 char *s, *p;
275 int len;
277 if (!f)
278 return;
279 s = fgets(buffer, BUF_SIZE, f);
280 fclose(f);
281 if (!s)
282 return;
283 while (isspace(*s))
284 s++;
285 if (!*s)
286 return;
287 remote->origin = REMOTE_BRANCHES;
288 p = s + strlen(s);
289 while (isspace(p[-1]))
290 *--p = 0;
291 len = p - s;
292 if (slash)
293 len += strlen(slash);
294 p = xmalloc(len + 1);
295 strcpy(p, s);
296 if (slash)
297 strcat(p, slash);
300 * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
301 * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
302 * the partial URL obtained from the branches file plus
303 * "/netdev-2.6" and does not store it in any tracking ref.
304 * #branch specifier in the file is ignored.
306 * Otherwise, the branches file would have URL and optionally
307 * #branch specified. The "master" (or specified) branch is
308 * fetched and stored in the local branch of the same name.
310 frag = strchr(p, '#');
311 if (frag) {
312 *(frag++) = '\0';
313 strbuf_addf(&branch, "refs/heads/%s", frag);
314 } else
315 strbuf_addstr(&branch, "refs/heads/master");
316 if (!slash) {
317 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
318 } else {
319 strbuf_reset(&branch);
320 strbuf_addstr(&branch, "HEAD:");
322 add_url_alias(remote, p);
323 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
325 * Cogito compatible push: push current HEAD to remote #branch
326 * (master if missing)
328 strbuf_init(&branch, 0);
329 strbuf_addstr(&branch, "HEAD");
330 if (frag)
331 strbuf_addf(&branch, ":refs/heads/%s", frag);
332 else
333 strbuf_addstr(&branch, ":refs/heads/master");
334 add_push_refspec(remote, strbuf_detach(&branch, NULL));
335 remote->fetch_tags = 1; /* always auto-follow */
338 static int handle_config(const char *key, const char *value, void *cb)
340 const char *name;
341 const char *subkey;
342 struct remote *remote;
343 struct branch *branch;
344 if (!prefixcmp(key, "branch.")) {
345 name = key + 7;
346 subkey = strrchr(name, '.');
347 if (!subkey)
348 return 0;
349 branch = make_branch(name, subkey - name);
350 if (!strcmp(subkey, ".remote")) {
351 if (!value)
352 return config_error_nonbool(key);
353 branch->remote_name = xstrdup(value);
354 if (branch == current_branch) {
355 default_remote_name = branch->remote_name;
356 explicit_default_remote_name = 1;
358 } else if (!strcmp(subkey, ".merge")) {
359 if (!value)
360 return config_error_nonbool(key);
361 add_merge(branch, xstrdup(value));
363 return 0;
365 if (!prefixcmp(key, "url.")) {
366 struct rewrite *rewrite;
367 name = key + 4;
368 subkey = strrchr(name, '.');
369 if (!subkey)
370 return 0;
371 if (!strcmp(subkey, ".insteadof")) {
372 rewrite = make_rewrite(&rewrites, name, subkey - name);
373 if (!value)
374 return config_error_nonbool(key);
375 add_instead_of(rewrite, xstrdup(value));
376 } else if (!strcmp(subkey, ".pushinsteadof")) {
377 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
378 if (!value)
379 return config_error_nonbool(key);
380 add_instead_of(rewrite, xstrdup(value));
383 if (prefixcmp(key, "remote."))
384 return 0;
385 name = key + 7;
386 if (*name == '/') {
387 warning("Config remote shorthand cannot begin with '/': %s",
388 name);
389 return 0;
391 subkey = strrchr(name, '.');
392 if (!subkey)
393 return 0;
394 remote = make_remote(name, subkey - name);
395 remote->origin = REMOTE_CONFIG;
396 if (!strcmp(subkey, ".mirror"))
397 remote->mirror = git_config_bool(key, value);
398 else if (!strcmp(subkey, ".skipdefaultupdate"))
399 remote->skip_default_update = git_config_bool(key, value);
401 else if (!strcmp(subkey, ".url")) {
402 const char *v;
403 if (git_config_string(&v, key, value))
404 return -1;
405 add_url(remote, v);
406 } else if (!strcmp(subkey, ".pushurl")) {
407 const char *v;
408 if (git_config_string(&v, key, value))
409 return -1;
410 add_pushurl(remote, v);
411 } else if (!strcmp(subkey, ".push")) {
412 const char *v;
413 if (git_config_string(&v, key, value))
414 return -1;
415 add_push_refspec(remote, v);
416 } else if (!strcmp(subkey, ".fetch")) {
417 const char *v;
418 if (git_config_string(&v, key, value))
419 return -1;
420 add_fetch_refspec(remote, v);
421 } else if (!strcmp(subkey, ".receivepack")) {
422 const char *v;
423 if (git_config_string(&v, key, value))
424 return -1;
425 if (!remote->receivepack)
426 remote->receivepack = v;
427 else
428 error("more than one receivepack given, using the first");
429 } else if (!strcmp(subkey, ".uploadpack")) {
430 const char *v;
431 if (git_config_string(&v, key, value))
432 return -1;
433 if (!remote->uploadpack)
434 remote->uploadpack = v;
435 else
436 error("more than one uploadpack given, using the first");
437 } else if (!strcmp(subkey, ".tagopt")) {
438 if (!strcmp(value, "--no-tags"))
439 remote->fetch_tags = -1;
440 } else if (!strcmp(subkey, ".proxy")) {
441 return git_config_string((const char **)&remote->http_proxy,
442 key, value);
444 return 0;
447 static void alias_all_urls(void)
449 int i, j;
450 for (i = 0; i < remotes_nr; i++) {
451 int add_pushurl_aliases;
452 if (!remotes[i])
453 continue;
454 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
455 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
457 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
458 for (j = 0; j < remotes[i]->url_nr; j++) {
459 if (add_pushurl_aliases)
460 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
461 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
466 static void read_config(void)
468 unsigned char sha1[20];
469 const char *head_ref;
470 int flag;
471 if (default_remote_name) // did this already
472 return;
473 default_remote_name = xstrdup("origin");
474 current_branch = NULL;
475 head_ref = resolve_ref("HEAD", sha1, 0, &flag);
476 if (head_ref && (flag & REF_ISSYMREF) &&
477 !prefixcmp(head_ref, "refs/heads/")) {
478 current_branch =
479 make_branch(head_ref + strlen("refs/heads/"), 0);
481 git_config(handle_config, NULL);
482 alias_all_urls();
486 * We need to make sure the tracking branches are well formed, but a
487 * wildcard refspec in "struct refspec" must have a trailing slash. We
488 * temporarily drop the trailing '/' while calling check_ref_format(),
489 * and put it back. The caller knows that a CHECK_REF_FORMAT_ONELEVEL
490 * error return is Ok for a wildcard refspec.
492 static int verify_refname(char *name, int is_glob)
494 int result;
496 result = check_ref_format(name);
497 if (is_glob && result == CHECK_REF_FORMAT_WILDCARD)
498 result = CHECK_REF_FORMAT_OK;
499 return result;
503 * This function frees a refspec array.
504 * Warning: code paths should be checked to ensure that the src
505 * and dst pointers are always freeable pointers as well
506 * as the refspec pointer itself.
508 static void free_refspecs(struct refspec *refspec, int nr_refspec)
510 int i;
512 if (!refspec)
513 return;
515 for (i = 0; i < nr_refspec; i++) {
516 free(refspec[i].src);
517 free(refspec[i].dst);
519 free(refspec);
522 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
524 int i;
525 int st;
526 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
528 for (i = 0; i < nr_refspec; i++) {
529 size_t llen;
530 int is_glob;
531 const char *lhs, *rhs;
533 is_glob = 0;
535 lhs = refspec[i];
536 if (*lhs == '+') {
537 rs[i].force = 1;
538 lhs++;
541 rhs = strrchr(lhs, ':');
544 * Before going on, special case ":" (or "+:") as a refspec
545 * for matching refs.
547 if (!fetch && rhs == lhs && rhs[1] == '\0') {
548 rs[i].matching = 1;
549 continue;
552 if (rhs) {
553 size_t rlen = strlen(++rhs);
554 is_glob = (1 <= rlen && strchr(rhs, '*'));
555 rs[i].dst = xstrndup(rhs, rlen);
558 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
559 if (1 <= llen && memchr(lhs, '*', llen)) {
560 if ((rhs && !is_glob) || (!rhs && fetch))
561 goto invalid;
562 is_glob = 1;
563 } else if (rhs && is_glob) {
564 goto invalid;
567 rs[i].pattern = is_glob;
568 rs[i].src = xstrndup(lhs, llen);
570 if (fetch) {
572 * LHS
573 * - empty is allowed; it means HEAD.
574 * - otherwise it must be a valid looking ref.
576 if (!*rs[i].src)
577 ; /* empty is ok */
578 else {
579 st = verify_refname(rs[i].src, is_glob);
580 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
581 goto invalid;
584 * RHS
585 * - missing is ok, and is same as empty.
586 * - empty is ok; it means not to store.
587 * - otherwise it must be a valid looking ref.
589 if (!rs[i].dst) {
590 ; /* ok */
591 } else if (!*rs[i].dst) {
592 ; /* ok */
593 } else {
594 st = verify_refname(rs[i].dst, is_glob);
595 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
596 goto invalid;
598 } else {
600 * LHS
601 * - empty is allowed; it means delete.
602 * - when wildcarded, it must be a valid looking ref.
603 * - otherwise, it must be an extended SHA-1, but
604 * there is no existing way to validate this.
606 if (!*rs[i].src)
607 ; /* empty is ok */
608 else if (is_glob) {
609 st = verify_refname(rs[i].src, is_glob);
610 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
611 goto invalid;
613 else
614 ; /* anything goes, for now */
616 * RHS
617 * - missing is allowed, but LHS then must be a
618 * valid looking ref.
619 * - empty is not allowed.
620 * - otherwise it must be a valid looking ref.
622 if (!rs[i].dst) {
623 st = verify_refname(rs[i].src, is_glob);
624 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
625 goto invalid;
626 } else if (!*rs[i].dst) {
627 goto invalid;
628 } else {
629 st = verify_refname(rs[i].dst, is_glob);
630 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
631 goto invalid;
635 return rs;
637 invalid:
638 if (verify) {
640 * nr_refspec must be greater than zero and i must be valid
641 * since it is only possible to reach this point from within
642 * the for loop above.
644 free_refspecs(rs, i+1);
645 return NULL;
647 die("Invalid refspec '%s'", refspec[i]);
650 int valid_fetch_refspec(const char *fetch_refspec_str)
652 const char *fetch_refspec[] = { fetch_refspec_str };
653 struct refspec *refspec;
655 refspec = parse_refspec_internal(1, fetch_refspec, 1, 1);
656 free_refspecs(refspec, 1);
657 return !!refspec;
660 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
662 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
665 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
667 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
670 static int valid_remote_nick(const char *name)
672 if (!name[0] || is_dot_or_dotdot(name))
673 return 0;
674 return !strchr(name, '/'); /* no slash */
677 struct remote *remote_get(const char *name)
679 struct remote *ret;
680 int name_given = 0;
682 read_config();
683 if (name)
684 name_given = 1;
685 else {
686 name = default_remote_name;
687 name_given = explicit_default_remote_name;
690 ret = make_remote(name, 0);
691 if (valid_remote_nick(name)) {
692 if (!ret->url)
693 read_remotes_file(ret);
694 if (!ret->url)
695 read_branches_file(ret);
697 if (name_given && !ret->url)
698 add_url_alias(ret, name);
699 if (!ret->url)
700 return NULL;
701 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
702 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
703 return ret;
706 int remote_is_configured(const char *name)
708 int i;
709 read_config();
711 for (i = 0; i < remotes_nr; i++)
712 if (!strcmp(name, remotes[i]->name))
713 return 1;
714 return 0;
717 int for_each_remote(each_remote_fn fn, void *priv)
719 int i, result = 0;
720 read_config();
721 for (i = 0; i < remotes_nr && !result; i++) {
722 struct remote *r = remotes[i];
723 if (!r)
724 continue;
725 if (!r->fetch)
726 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
727 r->fetch_refspec);
728 if (!r->push)
729 r->push = parse_push_refspec(r->push_refspec_nr,
730 r->push_refspec);
731 result = fn(r, priv);
733 return result;
736 void ref_remove_duplicates(struct ref *ref_map)
738 struct string_list refs = { NULL, 0, 0, 0 };
739 struct string_list_item *item = NULL;
740 struct ref *prev = NULL, *next = NULL;
741 for (; ref_map; prev = ref_map, ref_map = next) {
742 next = ref_map->next;
743 if (!ref_map->peer_ref)
744 continue;
746 item = string_list_lookup(ref_map->peer_ref->name, &refs);
747 if (item) {
748 if (strcmp(((struct ref *)item->util)->name,
749 ref_map->name))
750 die("%s tracks both %s and %s",
751 ref_map->peer_ref->name,
752 ((struct ref *)item->util)->name,
753 ref_map->name);
754 prev->next = ref_map->next;
755 free(ref_map->peer_ref);
756 free(ref_map);
757 ref_map = prev; /* skip this; we freed it */
758 continue;
761 item = string_list_insert(ref_map->peer_ref->name, &refs);
762 item->util = ref_map;
764 string_list_clear(&refs, 0);
767 int remote_has_url(struct remote *remote, const char *url)
769 int i;
770 for (i = 0; i < remote->url_nr; i++) {
771 if (!strcmp(remote->url[i], url))
772 return 1;
774 return 0;
777 static int match_name_with_pattern(const char *key, const char *name,
778 const char *value, char **result)
780 const char *kstar = strchr(key, '*');
781 size_t klen;
782 size_t ksuffixlen;
783 size_t namelen;
784 int ret;
785 if (!kstar)
786 die("Key '%s' of pattern had no '*'", key);
787 klen = kstar - key;
788 ksuffixlen = strlen(kstar + 1);
789 namelen = strlen(name);
790 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
791 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
792 if (ret && value) {
793 const char *vstar = strchr(value, '*');
794 size_t vlen;
795 size_t vsuffixlen;
796 if (!vstar)
797 die("Value '%s' of pattern has no '*'", value);
798 vlen = vstar - value;
799 vsuffixlen = strlen(vstar + 1);
800 *result = xmalloc(vlen + vsuffixlen +
801 strlen(name) -
802 klen - ksuffixlen + 1);
803 strncpy(*result, value, vlen);
804 strncpy(*result + vlen,
805 name + klen, namelen - klen - ksuffixlen);
806 strcpy(*result + vlen + namelen - klen - ksuffixlen,
807 vstar + 1);
809 return ret;
812 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
814 int find_src = refspec->src == NULL;
815 char *needle, **result;
816 int i;
818 if (find_src) {
819 if (!refspec->dst)
820 return error("find_tracking: need either src or dst");
821 needle = refspec->dst;
822 result = &refspec->src;
823 } else {
824 needle = refspec->src;
825 result = &refspec->dst;
828 for (i = 0; i < remote->fetch_refspec_nr; i++) {
829 struct refspec *fetch = &remote->fetch[i];
830 const char *key = find_src ? fetch->dst : fetch->src;
831 const char *value = find_src ? fetch->src : fetch->dst;
832 if (!fetch->dst)
833 continue;
834 if (fetch->pattern) {
835 if (match_name_with_pattern(key, needle, value, result)) {
836 refspec->force = fetch->force;
837 return 0;
839 } else if (!strcmp(needle, key)) {
840 *result = xstrdup(value);
841 refspec->force = fetch->force;
842 return 0;
845 return -1;
848 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
849 const char *name)
851 size_t len = strlen(name);
852 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
853 memcpy(ref->name, prefix, prefixlen);
854 memcpy(ref->name + prefixlen, name, len);
855 return ref;
858 struct ref *alloc_ref(const char *name)
860 return alloc_ref_with_prefix("", 0, name);
863 static struct ref *copy_ref(const struct ref *ref)
865 struct ref *cpy;
866 size_t len;
867 if (!ref)
868 return NULL;
869 len = strlen(ref->name);
870 cpy = xmalloc(sizeof(struct ref) + len + 1);
871 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
872 cpy->next = NULL;
873 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
874 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
875 cpy->peer_ref = copy_ref(ref->peer_ref);
876 return cpy;
879 struct ref *copy_ref_list(const struct ref *ref)
881 struct ref *ret = NULL;
882 struct ref **tail = &ret;
883 while (ref) {
884 *tail = copy_ref(ref);
885 ref = ref->next;
886 tail = &((*tail)->next);
888 return ret;
891 static void free_ref(struct ref *ref)
893 if (!ref)
894 return;
895 free_ref(ref->peer_ref);
896 free(ref->remote_status);
897 free(ref->symref);
898 free(ref);
901 void free_refs(struct ref *ref)
903 struct ref *next;
904 while (ref) {
905 next = ref->next;
906 free_ref(ref);
907 ref = next;
911 static int count_refspec_match(const char *pattern,
912 struct ref *refs,
913 struct ref **matched_ref)
915 int patlen = strlen(pattern);
916 struct ref *matched_weak = NULL;
917 struct ref *matched = NULL;
918 int weak_match = 0;
919 int match = 0;
921 for (weak_match = match = 0; refs; refs = refs->next) {
922 char *name = refs->name;
923 int namelen = strlen(name);
925 if (!refname_match(pattern, name, ref_rev_parse_rules))
926 continue;
928 /* A match is "weak" if it is with refs outside
929 * heads or tags, and did not specify the pattern
930 * in full (e.g. "refs/remotes/origin/master") or at
931 * least from the toplevel (e.g. "remotes/origin/master");
932 * otherwise "git push $URL master" would result in
933 * ambiguity between remotes/origin/master and heads/master
934 * at the remote site.
936 if (namelen != patlen &&
937 patlen != namelen - 5 &&
938 prefixcmp(name, "refs/heads/") &&
939 prefixcmp(name, "refs/tags/")) {
940 /* We want to catch the case where only weak
941 * matches are found and there are multiple
942 * matches, and where more than one strong
943 * matches are found, as ambiguous. One
944 * strong match with zero or more weak matches
945 * are acceptable as a unique match.
947 matched_weak = refs;
948 weak_match++;
950 else {
951 matched = refs;
952 match++;
955 if (!matched) {
956 *matched_ref = matched_weak;
957 return weak_match;
959 else {
960 *matched_ref = matched;
961 return match;
965 static void tail_link_ref(struct ref *ref, struct ref ***tail)
967 **tail = ref;
968 while (ref->next)
969 ref = ref->next;
970 *tail = &ref->next;
973 static struct ref *try_explicit_object_name(const char *name)
975 unsigned char sha1[20];
976 struct ref *ref;
978 if (!*name) {
979 ref = alloc_ref("(delete)");
980 hashclr(ref->new_sha1);
981 return ref;
983 if (get_sha1(name, sha1))
984 return NULL;
985 ref = alloc_ref(name);
986 hashcpy(ref->new_sha1, sha1);
987 return ref;
990 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
992 struct ref *ret = alloc_ref(name);
993 tail_link_ref(ret, tail);
994 return ret;
997 static char *guess_ref(const char *name, struct ref *peer)
999 struct strbuf buf = STRBUF_INIT;
1000 unsigned char sha1[20];
1002 const char *r = resolve_ref(peer->name, sha1, 1, NULL);
1003 if (!r)
1004 return NULL;
1006 if (!prefixcmp(r, "refs/heads/"))
1007 strbuf_addstr(&buf, "refs/heads/");
1008 else if (!prefixcmp(r, "refs/tags/"))
1009 strbuf_addstr(&buf, "refs/tags/");
1010 else
1011 return NULL;
1013 strbuf_addstr(&buf, name);
1014 return strbuf_detach(&buf, NULL);
1017 static int match_explicit(struct ref *src, struct ref *dst,
1018 struct ref ***dst_tail,
1019 struct refspec *rs)
1021 struct ref *matched_src, *matched_dst;
1022 int copy_src;
1024 const char *dst_value = rs->dst;
1025 char *dst_guess;
1027 if (rs->pattern || rs->matching)
1028 return 0;
1030 matched_src = matched_dst = NULL;
1031 switch (count_refspec_match(rs->src, src, &matched_src)) {
1032 case 1:
1033 copy_src = 1;
1034 break;
1035 case 0:
1036 /* The source could be in the get_sha1() format
1037 * not a reference name. :refs/other is a
1038 * way to delete 'other' ref at the remote end.
1040 matched_src = try_explicit_object_name(rs->src);
1041 if (!matched_src)
1042 return error("src refspec %s does not match any.", rs->src);
1043 copy_src = 0;
1044 break;
1045 default:
1046 return error("src refspec %s matches more than one.", rs->src);
1049 if (!dst_value) {
1050 unsigned char sha1[20];
1051 int flag;
1053 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
1054 if (!dst_value ||
1055 ((flag & REF_ISSYMREF) &&
1056 prefixcmp(dst_value, "refs/heads/")))
1057 die("%s cannot be resolved to branch.",
1058 matched_src->name);
1061 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1062 case 1:
1063 break;
1064 case 0:
1065 if (!memcmp(dst_value, "refs/", 5))
1066 matched_dst = make_linked_ref(dst_value, dst_tail);
1067 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1068 matched_dst = make_linked_ref(dst_guess, dst_tail);
1069 else
1070 error("unable to push to unqualified destination: %s\n"
1071 "The destination refspec neither matches an "
1072 "existing ref on the remote nor\n"
1073 "begins with refs/, and we are unable to "
1074 "guess a prefix based on the source ref.",
1075 dst_value);
1076 break;
1077 default:
1078 matched_dst = NULL;
1079 error("dst refspec %s matches more than one.",
1080 dst_value);
1081 break;
1083 if (!matched_dst)
1084 return -1;
1085 if (matched_dst->peer_ref)
1086 return error("dst ref %s receives from more than one src.",
1087 matched_dst->name);
1088 else {
1089 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1090 matched_dst->force = rs->force;
1092 return 0;
1095 static int match_explicit_refs(struct ref *src, struct ref *dst,
1096 struct ref ***dst_tail, struct refspec *rs,
1097 int rs_nr)
1099 int i, errs;
1100 for (i = errs = 0; i < rs_nr; i++)
1101 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1102 return errs;
1105 static const struct refspec *check_pattern_match(const struct refspec *rs,
1106 int rs_nr,
1107 const struct ref *src)
1109 int i;
1110 int matching_refs = -1;
1111 for (i = 0; i < rs_nr; i++) {
1112 if (rs[i].matching &&
1113 (matching_refs == -1 || rs[i].force)) {
1114 matching_refs = i;
1115 continue;
1118 if (rs[i].pattern && match_name_with_pattern(rs[i].src, src->name,
1119 NULL, NULL))
1120 return rs + i;
1122 if (matching_refs != -1)
1123 return rs + matching_refs;
1124 else
1125 return NULL;
1128 static struct ref **tail_ref(struct ref **head)
1130 struct ref **tail = head;
1131 while (*tail)
1132 tail = &((*tail)->next);
1133 return tail;
1137 * Note. This is used only by "push"; refspec matching rules for
1138 * push and fetch are subtly different, so do not try to reuse it
1139 * without thinking.
1141 int match_refs(struct ref *src, struct ref **dst,
1142 int nr_refspec, const char **refspec, int flags)
1144 struct refspec *rs;
1145 int send_all = flags & MATCH_REFS_ALL;
1146 int send_mirror = flags & MATCH_REFS_MIRROR;
1147 int errs;
1148 static const char *default_refspec[] = { ":", NULL };
1149 struct ref **dst_tail = tail_ref(dst);
1151 if (!nr_refspec) {
1152 nr_refspec = 1;
1153 refspec = default_refspec;
1155 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1156 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1158 /* pick the remainder */
1159 for ( ; src; src = src->next) {
1160 struct ref *dst_peer;
1161 const struct refspec *pat = NULL;
1162 char *dst_name;
1163 if (src->peer_ref)
1164 continue;
1166 pat = check_pattern_match(rs, nr_refspec, src);
1167 if (!pat)
1168 continue;
1170 if (pat->matching) {
1172 * "matching refs"; traditionally we pushed everything
1173 * including refs outside refs/heads/ hierarchy, but
1174 * that does not make much sense these days.
1176 if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
1177 continue;
1178 dst_name = xstrdup(src->name);
1180 } else {
1181 const char *dst_side = pat->dst ? pat->dst : pat->src;
1182 if (!match_name_with_pattern(pat->src, src->name,
1183 dst_side, &dst_name))
1184 die("Didn't think it matches any more");
1186 dst_peer = find_ref_by_name(*dst, dst_name);
1187 if (dst_peer) {
1188 if (dst_peer->peer_ref)
1189 /* We're already sending something to this ref. */
1190 goto free_name;
1192 } else {
1193 if (pat->matching && !(send_all || send_mirror))
1195 * Remote doesn't have it, and we have no
1196 * explicit pattern, and we don't have
1197 * --all nor --mirror.
1199 goto free_name;
1201 /* Create a new one and link it */
1202 dst_peer = make_linked_ref(dst_name, &dst_tail);
1203 hashcpy(dst_peer->new_sha1, src->new_sha1);
1205 dst_peer->peer_ref = copy_ref(src);
1206 dst_peer->force = pat->force;
1207 free_name:
1208 free(dst_name);
1210 if (errs)
1211 return -1;
1212 return 0;
1215 struct branch *branch_get(const char *name)
1217 struct branch *ret;
1219 read_config();
1220 if (!name || !*name || !strcmp(name, "HEAD"))
1221 ret = current_branch;
1222 else
1223 ret = make_branch(name, 0);
1224 if (ret && ret->remote_name) {
1225 ret->remote = remote_get(ret->remote_name);
1226 if (ret->merge_nr) {
1227 int i;
1228 ret->merge = xcalloc(sizeof(*ret->merge),
1229 ret->merge_nr);
1230 for (i = 0; i < ret->merge_nr; i++) {
1231 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1232 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1233 if (remote_find_tracking(ret->remote, ret->merge[i])
1234 && !strcmp(ret->remote_name, "."))
1235 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1239 return ret;
1242 int branch_has_merge_config(struct branch *branch)
1244 return branch && !!branch->merge;
1247 int branch_merge_matches(struct branch *branch,
1248 int i,
1249 const char *refname)
1251 if (!branch || i < 0 || i >= branch->merge_nr)
1252 return 0;
1253 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1256 static struct ref *get_expanded_map(const struct ref *remote_refs,
1257 const struct refspec *refspec)
1259 const struct ref *ref;
1260 struct ref *ret = NULL;
1261 struct ref **tail = &ret;
1263 char *expn_name;
1265 for (ref = remote_refs; ref; ref = ref->next) {
1266 if (strchr(ref->name, '^'))
1267 continue; /* a dereference item */
1268 if (match_name_with_pattern(refspec->src, ref->name,
1269 refspec->dst, &expn_name)) {
1270 struct ref *cpy = copy_ref(ref);
1272 cpy->peer_ref = alloc_ref(expn_name);
1273 free(expn_name);
1274 if (refspec->force)
1275 cpy->peer_ref->force = 1;
1276 *tail = cpy;
1277 tail = &cpy->next;
1281 return ret;
1284 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1286 const struct ref *ref;
1287 for (ref = refs; ref; ref = ref->next) {
1288 if (refname_match(name, ref->name, ref_fetch_rules))
1289 return ref;
1291 return NULL;
1294 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1296 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1298 if (!ref)
1299 return NULL;
1301 return copy_ref(ref);
1304 static struct ref *get_local_ref(const char *name)
1306 if (!name || name[0] == '\0')
1307 return NULL;
1309 if (!prefixcmp(name, "refs/"))
1310 return alloc_ref(name);
1312 if (!prefixcmp(name, "heads/") ||
1313 !prefixcmp(name, "tags/") ||
1314 !prefixcmp(name, "remotes/"))
1315 return alloc_ref_with_prefix("refs/", 5, name);
1317 return alloc_ref_with_prefix("refs/heads/", 11, name);
1320 int get_fetch_map(const struct ref *remote_refs,
1321 const struct refspec *refspec,
1322 struct ref ***tail,
1323 int missing_ok)
1325 struct ref *ref_map, **rmp;
1327 if (refspec->pattern) {
1328 ref_map = get_expanded_map(remote_refs, refspec);
1329 } else {
1330 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1332 ref_map = get_remote_ref(remote_refs, name);
1333 if (!missing_ok && !ref_map)
1334 die("Couldn't find remote ref %s", name);
1335 if (ref_map) {
1336 ref_map->peer_ref = get_local_ref(refspec->dst);
1337 if (ref_map->peer_ref && refspec->force)
1338 ref_map->peer_ref->force = 1;
1342 for (rmp = &ref_map; *rmp; ) {
1343 if ((*rmp)->peer_ref) {
1344 int st = check_ref_format((*rmp)->peer_ref->name + 5);
1345 if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
1346 struct ref *ignore = *rmp;
1347 error("* Ignoring funny ref '%s' locally",
1348 (*rmp)->peer_ref->name);
1349 *rmp = (*rmp)->next;
1350 free(ignore->peer_ref);
1351 free(ignore);
1352 continue;
1355 rmp = &((*rmp)->next);
1358 if (ref_map)
1359 tail_link_ref(ref_map, tail);
1361 return 0;
1364 int resolve_remote_symref(struct ref *ref, struct ref *list)
1366 if (!ref->symref)
1367 return 0;
1368 for (; list; list = list->next)
1369 if (!strcmp(ref->symref, list->name)) {
1370 hashcpy(ref->old_sha1, list->old_sha1);
1371 return 0;
1373 return 1;
1376 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1378 while (list) {
1379 struct commit_list *temp = list;
1380 temp->item->object.flags &= ~mark;
1381 list = temp->next;
1382 free(temp);
1386 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1388 struct object *o;
1389 struct commit *old, *new;
1390 struct commit_list *list, *used;
1391 int found = 0;
1393 /* Both new and old must be commit-ish and new is descendant of
1394 * old. Otherwise we require --force.
1396 o = deref_tag(parse_object(old_sha1), NULL, 0);
1397 if (!o || o->type != OBJ_COMMIT)
1398 return 0;
1399 old = (struct commit *) o;
1401 o = deref_tag(parse_object(new_sha1), NULL, 0);
1402 if (!o || o->type != OBJ_COMMIT)
1403 return 0;
1404 new = (struct commit *) o;
1406 if (parse_commit(new) < 0)
1407 return 0;
1409 used = list = NULL;
1410 commit_list_insert(new, &list);
1411 while (list) {
1412 new = pop_most_recent_commit(&list, TMP_MARK);
1413 commit_list_insert(new, &used);
1414 if (new == old) {
1415 found = 1;
1416 break;
1419 unmark_and_free(list, TMP_MARK);
1420 unmark_and_free(used, TMP_MARK);
1421 return found;
1425 * Return true if there is anything to report, otherwise false.
1427 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1429 unsigned char sha1[20];
1430 struct commit *ours, *theirs;
1431 char symmetric[84];
1432 struct rev_info revs;
1433 const char *rev_argv[10], *base;
1434 int rev_argc;
1437 * Nothing to report unless we are marked to build on top of
1438 * somebody else.
1440 if (!branch ||
1441 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1442 return 0;
1445 * If what we used to build on no longer exists, there is
1446 * nothing to report.
1448 base = branch->merge[0]->dst;
1449 if (!resolve_ref(base, sha1, 1, NULL))
1450 return 0;
1451 theirs = lookup_commit_reference(sha1);
1452 if (!theirs)
1453 return 0;
1455 if (!resolve_ref(branch->refname, sha1, 1, NULL))
1456 return 0;
1457 ours = lookup_commit_reference(sha1);
1458 if (!ours)
1459 return 0;
1461 /* are we the same? */
1462 if (theirs == ours)
1463 return 0;
1465 /* Run "rev-list --left-right ours...theirs" internally... */
1466 rev_argc = 0;
1467 rev_argv[rev_argc++] = NULL;
1468 rev_argv[rev_argc++] = "--left-right";
1469 rev_argv[rev_argc++] = symmetric;
1470 rev_argv[rev_argc++] = "--";
1471 rev_argv[rev_argc] = NULL;
1473 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1474 strcpy(symmetric + 40, "...");
1475 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1477 init_revisions(&revs, NULL);
1478 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1479 prepare_revision_walk(&revs);
1481 /* ... and count the commits on each side. */
1482 *num_ours = 0;
1483 *num_theirs = 0;
1484 while (1) {
1485 struct commit *c = get_revision(&revs);
1486 if (!c)
1487 break;
1488 if (c->object.flags & SYMMETRIC_LEFT)
1489 (*num_ours)++;
1490 else
1491 (*num_theirs)++;
1494 /* clear object flags smudged by the above traversal */
1495 clear_commit_marks(ours, ALL_REV_FLAGS);
1496 clear_commit_marks(theirs, ALL_REV_FLAGS);
1497 return 1;
1501 * Return true when there is anything to report, otherwise false.
1503 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1505 int num_ours, num_theirs;
1506 const char *base;
1508 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1509 return 0;
1511 base = branch->merge[0]->dst;
1512 base = shorten_unambiguous_ref(base, 0);
1513 if (!num_theirs)
1514 strbuf_addf(sb, "Your branch is ahead of '%s' "
1515 "by %d commit%s.\n",
1516 base, num_ours, (num_ours == 1) ? "" : "s");
1517 else if (!num_ours)
1518 strbuf_addf(sb, "Your branch is behind '%s' "
1519 "by %d commit%s, "
1520 "and can be fast-forwarded.\n",
1521 base, num_theirs, (num_theirs == 1) ? "" : "s");
1522 else
1523 strbuf_addf(sb, "Your branch and '%s' have diverged,\n"
1524 "and have %d and %d different commit(s) each, "
1525 "respectively.\n",
1526 base, num_ours, num_theirs);
1527 return 1;
1530 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1532 struct ref ***local_tail = cb_data;
1533 struct ref *ref;
1534 int len;
1536 /* we already know it starts with refs/ to get here */
1537 if (check_ref_format(refname + 5))
1538 return 0;
1540 len = strlen(refname) + 1;
1541 ref = xcalloc(1, sizeof(*ref) + len);
1542 hashcpy(ref->new_sha1, sha1);
1543 memcpy(ref->name, refname, len);
1544 **local_tail = ref;
1545 *local_tail = &ref->next;
1546 return 0;
1549 struct ref *get_local_heads(void)
1551 struct ref *local_refs = NULL, **local_tail = &local_refs;
1552 for_each_ref(one_local_ref, &local_tail);
1553 return local_refs;
1556 struct ref *guess_remote_head(const struct ref *head,
1557 const struct ref *refs,
1558 int all)
1560 const struct ref *r;
1561 struct ref *list = NULL;
1562 struct ref **tail = &list;
1564 if (!head)
1565 return NULL;
1568 * Some transports support directly peeking at
1569 * where HEAD points; if that is the case, then
1570 * we don't have to guess.
1572 if (head->symref)
1573 return copy_ref(find_ref_by_name(refs, head->symref));
1575 /* If refs/heads/master could be right, it is. */
1576 if (!all) {
1577 r = find_ref_by_name(refs, "refs/heads/master");
1578 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1579 return copy_ref(r);
1582 /* Look for another ref that points there */
1583 for (r = refs; r; r = r->next) {
1584 if (r != head && !hashcmp(r->old_sha1, head->old_sha1)) {
1585 *tail = copy_ref(r);
1586 tail = &((*tail)->next);
1587 if (!all)
1588 break;
1592 return list;