git-remote rename: migrate from remotes/ and branches/
[git/vmiklos.git] / remote.c
blobcbb3e484fe7803f68eae8507c8216ed951d0b54b
1 #include "cache.h"
2 #include "remote.h"
3 #include "refs.h"
4 #include "commit.h"
5 #include "diff.h"
6 #include "revision.h"
8 static struct refspec s_tag_refspec = {
9 0,
12 "refs/tags/",
13 "refs/tags/"
16 const struct refspec *tag_refspec = &s_tag_refspec;
18 struct counted_string {
19 size_t len;
20 const char *s;
22 struct rewrite {
23 const char *base;
24 size_t baselen;
25 struct counted_string *instead_of;
26 int instead_of_nr;
27 int instead_of_alloc;
30 static struct remote **remotes;
31 static int remotes_alloc;
32 static int remotes_nr;
34 static struct branch **branches;
35 static int branches_alloc;
36 static int branches_nr;
38 static struct branch *current_branch;
39 static const char *default_remote_name;
41 static struct rewrite **rewrite;
42 static int rewrite_alloc;
43 static int rewrite_nr;
45 #define BUF_SIZE (2048)
46 static char buffer[BUF_SIZE];
48 static const char *alias_url(const char *url)
50 int i, j;
51 char *ret;
52 struct counted_string *longest;
53 int longest_i;
55 longest = NULL;
56 longest_i = -1;
57 for (i = 0; i < rewrite_nr; i++) {
58 if (!rewrite[i])
59 continue;
60 for (j = 0; j < rewrite[i]->instead_of_nr; j++) {
61 if (!prefixcmp(url, rewrite[i]->instead_of[j].s) &&
62 (!longest ||
63 longest->len < rewrite[i]->instead_of[j].len)) {
64 longest = &(rewrite[i]->instead_of[j]);
65 longest_i = i;
69 if (!longest)
70 return url;
72 ret = xmalloc(rewrite[longest_i]->baselen +
73 (strlen(url) - longest->len) + 1);
74 strcpy(ret, rewrite[longest_i]->base);
75 strcpy(ret + rewrite[longest_i]->baselen, url + longest->len);
76 return ret;
79 static void add_push_refspec(struct remote *remote, const char *ref)
81 ALLOC_GROW(remote->push_refspec,
82 remote->push_refspec_nr + 1,
83 remote->push_refspec_alloc);
84 remote->push_refspec[remote->push_refspec_nr++] = ref;
87 static void add_fetch_refspec(struct remote *remote, const char *ref)
89 ALLOC_GROW(remote->fetch_refspec,
90 remote->fetch_refspec_nr + 1,
91 remote->fetch_refspec_alloc);
92 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
95 static void add_url(struct remote *remote, const char *url)
97 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
98 remote->url[remote->url_nr++] = url;
101 static void add_url_alias(struct remote *remote, const char *url)
103 add_url(remote, alias_url(url));
106 static struct remote *make_remote(const char *name, int len)
108 struct remote *ret;
109 int i;
111 for (i = 0; i < remotes_nr; i++) {
112 if (len ? (!strncmp(name, remotes[i]->name, len) &&
113 !remotes[i]->name[len]) :
114 !strcmp(name, remotes[i]->name))
115 return remotes[i];
118 ret = xcalloc(1, sizeof(struct remote));
119 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
120 remotes[remotes_nr++] = ret;
121 if (len)
122 ret->name = xstrndup(name, len);
123 else
124 ret->name = xstrdup(name);
125 return ret;
128 static void add_merge(struct branch *branch, const char *name)
130 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
131 branch->merge_alloc);
132 branch->merge_name[branch->merge_nr++] = name;
135 static struct branch *make_branch(const char *name, int len)
137 struct branch *ret;
138 int i;
139 char *refname;
141 for (i = 0; i < branches_nr; i++) {
142 if (len ? (!strncmp(name, branches[i]->name, len) &&
143 !branches[i]->name[len]) :
144 !strcmp(name, branches[i]->name))
145 return branches[i];
148 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
149 ret = xcalloc(1, sizeof(struct branch));
150 branches[branches_nr++] = ret;
151 if (len)
152 ret->name = xstrndup(name, len);
153 else
154 ret->name = xstrdup(name);
155 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
156 strcpy(refname, "refs/heads/");
157 strcpy(refname + strlen("refs/heads/"), ret->name);
158 ret->refname = refname;
160 return ret;
163 static struct rewrite *make_rewrite(const char *base, int len)
165 struct rewrite *ret;
166 int i;
168 for (i = 0; i < rewrite_nr; i++) {
169 if (len
170 ? (len == rewrite[i]->baselen &&
171 !strncmp(base, rewrite[i]->base, len))
172 : !strcmp(base, rewrite[i]->base))
173 return rewrite[i];
176 ALLOC_GROW(rewrite, rewrite_nr + 1, rewrite_alloc);
177 ret = xcalloc(1, sizeof(struct rewrite));
178 rewrite[rewrite_nr++] = ret;
179 if (len) {
180 ret->base = xstrndup(base, len);
181 ret->baselen = len;
183 else {
184 ret->base = xstrdup(base);
185 ret->baselen = strlen(base);
187 return ret;
190 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
192 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
193 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
194 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
195 rewrite->instead_of_nr++;
198 static void read_remotes_file(struct remote *remote)
200 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
202 if (!f)
203 return;
204 remote->origin = REMOTE_REMOTES;
205 while (fgets(buffer, BUF_SIZE, f)) {
206 int value_list;
207 char *s, *p;
209 if (!prefixcmp(buffer, "URL:")) {
210 value_list = 0;
211 s = buffer + 4;
212 } else if (!prefixcmp(buffer, "Push:")) {
213 value_list = 1;
214 s = buffer + 5;
215 } else if (!prefixcmp(buffer, "Pull:")) {
216 value_list = 2;
217 s = buffer + 5;
218 } else
219 continue;
221 while (isspace(*s))
222 s++;
223 if (!*s)
224 continue;
226 p = s + strlen(s);
227 while (isspace(p[-1]))
228 *--p = 0;
230 switch (value_list) {
231 case 0:
232 add_url_alias(remote, xstrdup(s));
233 break;
234 case 1:
235 add_push_refspec(remote, xstrdup(s));
236 break;
237 case 2:
238 add_fetch_refspec(remote, xstrdup(s));
239 break;
242 fclose(f);
245 static void read_branches_file(struct remote *remote)
247 const char *slash = strchr(remote->name, '/');
248 char *frag;
249 struct strbuf branch = STRBUF_INIT;
250 int n = slash ? slash - remote->name : 1000;
251 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
252 char *s, *p;
253 int len;
255 if (!f)
256 return;
257 s = fgets(buffer, BUF_SIZE, f);
258 fclose(f);
259 if (!s)
260 return;
261 while (isspace(*s))
262 s++;
263 if (!*s)
264 return;
265 remote->origin = REMOTE_BRANCHES;
266 p = s + strlen(s);
267 while (isspace(p[-1]))
268 *--p = 0;
269 len = p - s;
270 if (slash)
271 len += strlen(slash);
272 p = xmalloc(len + 1);
273 strcpy(p, s);
274 if (slash)
275 strcat(p, slash);
278 * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
279 * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
280 * the partial URL obtained from the branches file plus
281 * "/netdev-2.6" and does not store it in any tracking ref.
282 * #branch specifier in the file is ignored.
284 * Otherwise, the branches file would have URL and optionally
285 * #branch specified. The "master" (or specified) branch is
286 * fetched and stored in the local branch of the same name.
288 frag = strchr(p, '#');
289 if (frag) {
290 *(frag++) = '\0';
291 strbuf_addf(&branch, "refs/heads/%s", frag);
292 } else
293 strbuf_addstr(&branch, "refs/heads/master");
294 if (!slash) {
295 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
296 } else {
297 strbuf_reset(&branch);
298 strbuf_addstr(&branch, "HEAD:");
300 add_url_alias(remote, p);
301 add_fetch_refspec(remote, strbuf_detach(&branch, 0));
302 remote->fetch_tags = 1; /* always auto-follow */
305 static int handle_config(const char *key, const char *value, void *cb)
307 const char *name;
308 const char *subkey;
309 struct remote *remote;
310 struct branch *branch;
311 if (!prefixcmp(key, "branch.")) {
312 name = key + 7;
313 subkey = strrchr(name, '.');
314 if (!subkey)
315 return 0;
316 branch = make_branch(name, subkey - name);
317 if (!strcmp(subkey, ".remote")) {
318 if (!value)
319 return config_error_nonbool(key);
320 branch->remote_name = xstrdup(value);
321 if (branch == current_branch)
322 default_remote_name = branch->remote_name;
323 } else if (!strcmp(subkey, ".merge")) {
324 if (!value)
325 return config_error_nonbool(key);
326 add_merge(branch, xstrdup(value));
328 return 0;
330 if (!prefixcmp(key, "url.")) {
331 struct rewrite *rewrite;
332 name = key + 4;
333 subkey = strrchr(name, '.');
334 if (!subkey)
335 return 0;
336 rewrite = make_rewrite(name, subkey - name);
337 if (!strcmp(subkey, ".insteadof")) {
338 if (!value)
339 return config_error_nonbool(key);
340 add_instead_of(rewrite, xstrdup(value));
343 if (prefixcmp(key, "remote."))
344 return 0;
345 name = key + 7;
346 if (*name == '/') {
347 warning("Config remote shorthand cannot begin with '/': %s",
348 name);
349 return 0;
351 subkey = strrchr(name, '.');
352 if (!subkey)
353 return error("Config with no key for remote %s", name);
354 remote = make_remote(name, subkey - name);
355 remote->origin = REMOTE_CONFIG;
356 if (!strcmp(subkey, ".mirror"))
357 remote->mirror = git_config_bool(key, value);
358 else if (!strcmp(subkey, ".skipdefaultupdate"))
359 remote->skip_default_update = git_config_bool(key, value);
361 else if (!strcmp(subkey, ".url")) {
362 const char *v;
363 if (git_config_string(&v, key, value))
364 return -1;
365 add_url(remote, v);
366 } else if (!strcmp(subkey, ".push")) {
367 const char *v;
368 if (git_config_string(&v, key, value))
369 return -1;
370 add_push_refspec(remote, v);
371 } else if (!strcmp(subkey, ".fetch")) {
372 const char *v;
373 if (git_config_string(&v, key, value))
374 return -1;
375 add_fetch_refspec(remote, v);
376 } else if (!strcmp(subkey, ".receivepack")) {
377 const char *v;
378 if (git_config_string(&v, key, value))
379 return -1;
380 if (!remote->receivepack)
381 remote->receivepack = v;
382 else
383 error("more than one receivepack given, using the first");
384 } else if (!strcmp(subkey, ".uploadpack")) {
385 const char *v;
386 if (git_config_string(&v, key, value))
387 return -1;
388 if (!remote->uploadpack)
389 remote->uploadpack = v;
390 else
391 error("more than one uploadpack given, using the first");
392 } else if (!strcmp(subkey, ".tagopt")) {
393 if (!strcmp(value, "--no-tags"))
394 remote->fetch_tags = -1;
395 } else if (!strcmp(subkey, ".proxy")) {
396 return git_config_string((const char **)&remote->http_proxy,
397 key, value);
399 return 0;
402 static void alias_all_urls(void)
404 int i, j;
405 for (i = 0; i < remotes_nr; i++) {
406 if (!remotes[i])
407 continue;
408 for (j = 0; j < remotes[i]->url_nr; j++) {
409 remotes[i]->url[j] = alias_url(remotes[i]->url[j]);
414 static void read_config(void)
416 unsigned char sha1[20];
417 const char *head_ref;
418 int flag;
419 if (default_remote_name) // did this already
420 return;
421 default_remote_name = xstrdup("origin");
422 current_branch = NULL;
423 head_ref = resolve_ref("HEAD", sha1, 0, &flag);
424 if (head_ref && (flag & REF_ISSYMREF) &&
425 !prefixcmp(head_ref, "refs/heads/")) {
426 current_branch =
427 make_branch(head_ref + strlen("refs/heads/"), 0);
429 git_config(handle_config, NULL);
430 alias_all_urls();
434 * We need to make sure the tracking branches are well formed, but a
435 * wildcard refspec in "struct refspec" must have a trailing slash. We
436 * temporarily drop the trailing '/' while calling check_ref_format(),
437 * and put it back. The caller knows that a CHECK_REF_FORMAT_ONELEVEL
438 * error return is Ok for a wildcard refspec.
440 static int verify_refname(char *name, int is_glob)
442 int result, len = -1;
444 if (is_glob) {
445 len = strlen(name);
446 assert(name[len - 1] == '/');
447 name[len - 1] = '\0';
449 result = check_ref_format(name);
450 if (is_glob)
451 name[len - 1] = '/';
452 return result;
456 * This function frees a refspec array.
457 * Warning: code paths should be checked to ensure that the src
458 * and dst pointers are always freeable pointers as well
459 * as the refspec pointer itself.
461 static void free_refspecs(struct refspec *refspec, int nr_refspec)
463 int i;
465 if (!refspec)
466 return;
468 for (i = 0; i < nr_refspec; i++) {
469 free(refspec[i].src);
470 free(refspec[i].dst);
472 free(refspec);
475 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
477 int i;
478 int st;
479 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
481 for (i = 0; i < nr_refspec; i++) {
482 size_t llen;
483 int is_glob;
484 const char *lhs, *rhs;
486 llen = is_glob = 0;
488 lhs = refspec[i];
489 if (*lhs == '+') {
490 rs[i].force = 1;
491 lhs++;
494 rhs = strrchr(lhs, ':');
497 * Before going on, special case ":" (or "+:") as a refspec
498 * for matching refs.
500 if (!fetch && rhs == lhs && rhs[1] == '\0') {
501 rs[i].matching = 1;
502 continue;
505 if (rhs) {
506 size_t rlen = strlen(++rhs);
507 is_glob = (2 <= rlen && !strcmp(rhs + rlen - 2, "/*"));
508 rs[i].dst = xstrndup(rhs, rlen - is_glob);
511 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
512 if (2 <= llen && !memcmp(lhs + llen - 2, "/*", 2)) {
513 if ((rhs && !is_glob) || (!rhs && fetch))
514 goto invalid;
515 is_glob = 1;
516 llen--;
517 } else if (rhs && is_glob) {
518 goto invalid;
521 rs[i].pattern = is_glob;
522 rs[i].src = xstrndup(lhs, llen);
524 if (fetch) {
526 * LHS
527 * - empty is allowed; it means HEAD.
528 * - otherwise it must be a valid looking ref.
530 if (!*rs[i].src)
531 ; /* empty is ok */
532 else {
533 st = verify_refname(rs[i].src, is_glob);
534 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
535 goto invalid;
538 * RHS
539 * - missing is ok, and is same as empty.
540 * - empty is ok; it means not to store.
541 * - otherwise it must be a valid looking ref.
543 if (!rs[i].dst) {
544 ; /* ok */
545 } else if (!*rs[i].dst) {
546 ; /* ok */
547 } else {
548 st = verify_refname(rs[i].dst, is_glob);
549 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
550 goto invalid;
552 } else {
554 * LHS
555 * - empty is allowed; it means delete.
556 * - when wildcarded, it must be a valid looking ref.
557 * - otherwise, it must be an extended SHA-1, but
558 * there is no existing way to validate this.
560 if (!*rs[i].src)
561 ; /* empty is ok */
562 else if (is_glob) {
563 st = verify_refname(rs[i].src, is_glob);
564 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
565 goto invalid;
567 else
568 ; /* anything goes, for now */
570 * RHS
571 * - missing is allowed, but LHS then must be a
572 * valid looking ref.
573 * - empty is not allowed.
574 * - otherwise it must be a valid looking ref.
576 if (!rs[i].dst) {
577 st = verify_refname(rs[i].src, is_glob);
578 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
579 goto invalid;
580 } else if (!*rs[i].dst) {
581 goto invalid;
582 } else {
583 st = verify_refname(rs[i].dst, is_glob);
584 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
585 goto invalid;
589 return rs;
591 invalid:
592 if (verify) {
594 * nr_refspec must be greater than zero and i must be valid
595 * since it is only possible to reach this point from within
596 * the for loop above.
598 free_refspecs(rs, i+1);
599 return NULL;
601 die("Invalid refspec '%s'", refspec[i]);
604 int valid_fetch_refspec(const char *fetch_refspec_str)
606 const char *fetch_refspec[] = { fetch_refspec_str };
607 struct refspec *refspec;
609 refspec = parse_refspec_internal(1, fetch_refspec, 1, 1);
610 free_refspecs(refspec, 1);
611 return !!refspec;
614 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
616 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
619 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
621 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
624 static int valid_remote_nick(const char *name)
626 if (!name[0] || /* not empty */
627 (name[0] == '.' && /* not "." */
628 (!name[1] || /* not ".." */
629 (name[1] == '.' && !name[2]))))
630 return 0;
631 return !strchr(name, '/'); /* no slash */
634 struct remote *remote_get(const char *name)
636 struct remote *ret;
638 read_config();
639 if (!name)
640 name = default_remote_name;
641 ret = make_remote(name, 0);
642 if (valid_remote_nick(name)) {
643 if (!ret->url)
644 read_remotes_file(ret);
645 if (!ret->url)
646 read_branches_file(ret);
648 if (!ret->url)
649 add_url_alias(ret, name);
650 if (!ret->url)
651 return NULL;
652 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
653 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
654 return ret;
657 int for_each_remote(each_remote_fn fn, void *priv)
659 int i, result = 0;
660 read_config();
661 for (i = 0; i < remotes_nr && !result; i++) {
662 struct remote *r = remotes[i];
663 if (!r)
664 continue;
665 if (!r->fetch)
666 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
667 r->fetch_refspec);
668 if (!r->push)
669 r->push = parse_push_refspec(r->push_refspec_nr,
670 r->push_refspec);
671 result = fn(r, priv);
673 return result;
676 void ref_remove_duplicates(struct ref *ref_map)
678 struct ref **posn;
679 struct ref *next;
680 for (; ref_map; ref_map = ref_map->next) {
681 if (!ref_map->peer_ref)
682 continue;
683 posn = &ref_map->next;
684 while (*posn) {
685 if ((*posn)->peer_ref &&
686 !strcmp((*posn)->peer_ref->name,
687 ref_map->peer_ref->name)) {
688 if (strcmp((*posn)->name, ref_map->name))
689 die("%s tracks both %s and %s",
690 ref_map->peer_ref->name,
691 (*posn)->name, ref_map->name);
692 next = (*posn)->next;
693 free((*posn)->peer_ref);
694 free(*posn);
695 *posn = next;
696 } else {
697 posn = &(*posn)->next;
703 int remote_has_url(struct remote *remote, const char *url)
705 int i;
706 for (i = 0; i < remote->url_nr; i++) {
707 if (!strcmp(remote->url[i], url))
708 return 1;
710 return 0;
713 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
715 int find_src = refspec->src == NULL;
716 char *needle, **result;
717 int i;
719 if (find_src) {
720 if (!refspec->dst)
721 return error("find_tracking: need either src or dst");
722 needle = refspec->dst;
723 result = &refspec->src;
724 } else {
725 needle = refspec->src;
726 result = &refspec->dst;
729 for (i = 0; i < remote->fetch_refspec_nr; i++) {
730 struct refspec *fetch = &remote->fetch[i];
731 const char *key = find_src ? fetch->dst : fetch->src;
732 const char *value = find_src ? fetch->src : fetch->dst;
733 if (!fetch->dst)
734 continue;
735 if (fetch->pattern) {
736 if (!prefixcmp(needle, key)) {
737 *result = xmalloc(strlen(value) +
738 strlen(needle) -
739 strlen(key) + 1);
740 strcpy(*result, value);
741 strcpy(*result + strlen(value),
742 needle + strlen(key));
743 refspec->force = fetch->force;
744 return 0;
746 } else if (!strcmp(needle, key)) {
747 *result = xstrdup(value);
748 refspec->force = fetch->force;
749 return 0;
752 return -1;
755 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
756 const char *name)
758 size_t len = strlen(name);
759 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
760 memcpy(ref->name, prefix, prefixlen);
761 memcpy(ref->name + prefixlen, name, len);
762 return ref;
765 struct ref *alloc_ref(const char *name)
767 return alloc_ref_with_prefix("", 0, name);
770 static struct ref *copy_ref(const struct ref *ref)
772 struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
773 memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
774 ret->next = NULL;
775 return ret;
778 struct ref *copy_ref_list(const struct ref *ref)
780 struct ref *ret = NULL;
781 struct ref **tail = &ret;
782 while (ref) {
783 *tail = copy_ref(ref);
784 ref = ref->next;
785 tail = &((*tail)->next);
787 return ret;
790 static void free_ref(struct ref *ref)
792 if (!ref)
793 return;
794 free(ref->remote_status);
795 free(ref->symref);
796 free(ref);
799 void free_refs(struct ref *ref)
801 struct ref *next;
802 while (ref) {
803 next = ref->next;
804 free(ref->peer_ref);
805 free_ref(ref);
806 ref = next;
810 static int count_refspec_match(const char *pattern,
811 struct ref *refs,
812 struct ref **matched_ref)
814 int patlen = strlen(pattern);
815 struct ref *matched_weak = NULL;
816 struct ref *matched = NULL;
817 int weak_match = 0;
818 int match = 0;
820 for (weak_match = match = 0; refs; refs = refs->next) {
821 char *name = refs->name;
822 int namelen = strlen(name);
824 if (!refname_match(pattern, name, ref_rev_parse_rules))
825 continue;
827 /* A match is "weak" if it is with refs outside
828 * heads or tags, and did not specify the pattern
829 * in full (e.g. "refs/remotes/origin/master") or at
830 * least from the toplevel (e.g. "remotes/origin/master");
831 * otherwise "git push $URL master" would result in
832 * ambiguity between remotes/origin/master and heads/master
833 * at the remote site.
835 if (namelen != patlen &&
836 patlen != namelen - 5 &&
837 prefixcmp(name, "refs/heads/") &&
838 prefixcmp(name, "refs/tags/")) {
839 /* We want to catch the case where only weak
840 * matches are found and there are multiple
841 * matches, and where more than one strong
842 * matches are found, as ambiguous. One
843 * strong match with zero or more weak matches
844 * are acceptable as a unique match.
846 matched_weak = refs;
847 weak_match++;
849 else {
850 matched = refs;
851 match++;
854 if (!matched) {
855 *matched_ref = matched_weak;
856 return weak_match;
858 else {
859 *matched_ref = matched;
860 return match;
864 static void tail_link_ref(struct ref *ref, struct ref ***tail)
866 **tail = ref;
867 while (ref->next)
868 ref = ref->next;
869 *tail = &ref->next;
872 static struct ref *try_explicit_object_name(const char *name)
874 unsigned char sha1[20];
875 struct ref *ref;
877 if (!*name) {
878 ref = alloc_ref("(delete)");
879 hashclr(ref->new_sha1);
880 return ref;
882 if (get_sha1(name, sha1))
883 return NULL;
884 ref = alloc_ref(name);
885 hashcpy(ref->new_sha1, sha1);
886 return ref;
889 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
891 struct ref *ret = alloc_ref(name);
892 tail_link_ref(ret, tail);
893 return ret;
896 static char *guess_ref(const char *name, struct ref *peer)
898 struct strbuf buf = STRBUF_INIT;
899 unsigned char sha1[20];
901 const char *r = resolve_ref(peer->name, sha1, 1, NULL);
902 if (!r)
903 return NULL;
905 if (!prefixcmp(r, "refs/heads/"))
906 strbuf_addstr(&buf, "refs/heads/");
907 else if (!prefixcmp(r, "refs/tags/"))
908 strbuf_addstr(&buf, "refs/tags/");
909 else
910 return NULL;
912 strbuf_addstr(&buf, name);
913 return strbuf_detach(&buf, NULL);
916 static int match_explicit(struct ref *src, struct ref *dst,
917 struct ref ***dst_tail,
918 struct refspec *rs)
920 struct ref *matched_src, *matched_dst;
922 const char *dst_value = rs->dst;
923 char *dst_guess;
925 if (rs->pattern || rs->matching)
926 return 0;
928 matched_src = matched_dst = NULL;
929 switch (count_refspec_match(rs->src, src, &matched_src)) {
930 case 1:
931 break;
932 case 0:
933 /* The source could be in the get_sha1() format
934 * not a reference name. :refs/other is a
935 * way to delete 'other' ref at the remote end.
937 matched_src = try_explicit_object_name(rs->src);
938 if (!matched_src)
939 return error("src refspec %s does not match any.", rs->src);
940 break;
941 default:
942 return error("src refspec %s matches more than one.", rs->src);
945 if (!dst_value) {
946 unsigned char sha1[20];
947 int flag;
949 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
950 if (!dst_value ||
951 ((flag & REF_ISSYMREF) &&
952 prefixcmp(dst_value, "refs/heads/")))
953 die("%s cannot be resolved to branch.",
954 matched_src->name);
957 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
958 case 1:
959 break;
960 case 0:
961 if (!memcmp(dst_value, "refs/", 5))
962 matched_dst = make_linked_ref(dst_value, dst_tail);
963 else if((dst_guess = guess_ref(dst_value, matched_src)))
964 matched_dst = make_linked_ref(dst_guess, dst_tail);
965 else
966 error("unable to push to unqualified destination: %s\n"
967 "The destination refspec neither matches an "
968 "existing ref on the remote nor\n"
969 "begins with refs/, and we are unable to "
970 "guess a prefix based on the source ref.",
971 dst_value);
972 break;
973 default:
974 matched_dst = NULL;
975 error("dst refspec %s matches more than one.",
976 dst_value);
977 break;
979 if (!matched_dst)
980 return -1;
981 if (matched_dst->peer_ref)
982 return error("dst ref %s receives from more than one src.",
983 matched_dst->name);
984 else {
985 matched_dst->peer_ref = matched_src;
986 matched_dst->force = rs->force;
988 return 0;
991 static int match_explicit_refs(struct ref *src, struct ref *dst,
992 struct ref ***dst_tail, struct refspec *rs,
993 int rs_nr)
995 int i, errs;
996 for (i = errs = 0; i < rs_nr; i++)
997 errs += match_explicit(src, dst, dst_tail, &rs[i]);
998 return errs;
1001 static const struct refspec *check_pattern_match(const struct refspec *rs,
1002 int rs_nr,
1003 const struct ref *src)
1005 int i;
1006 int matching_refs = -1;
1007 for (i = 0; i < rs_nr; i++) {
1008 if (rs[i].matching &&
1009 (matching_refs == -1 || rs[i].force)) {
1010 matching_refs = i;
1011 continue;
1014 if (rs[i].pattern && !prefixcmp(src->name, rs[i].src))
1015 return rs + i;
1017 if (matching_refs != -1)
1018 return rs + matching_refs;
1019 else
1020 return NULL;
1024 * Note. This is used only by "push"; refspec matching rules for
1025 * push and fetch are subtly different, so do not try to reuse it
1026 * without thinking.
1028 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
1029 int nr_refspec, const char **refspec, int flags)
1031 struct refspec *rs;
1032 int send_all = flags & MATCH_REFS_ALL;
1033 int send_mirror = flags & MATCH_REFS_MIRROR;
1034 static const char *default_refspec[] = { ":", 0 };
1036 if (!nr_refspec) {
1037 nr_refspec = 1;
1038 refspec = default_refspec;
1040 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1041 if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
1042 return -1;
1044 /* pick the remainder */
1045 for ( ; src; src = src->next) {
1046 struct ref *dst_peer;
1047 const struct refspec *pat = NULL;
1048 char *dst_name;
1049 if (src->peer_ref)
1050 continue;
1052 pat = check_pattern_match(rs, nr_refspec, src);
1053 if (!pat)
1054 continue;
1056 if (pat->matching) {
1058 * "matching refs"; traditionally we pushed everything
1059 * including refs outside refs/heads/ hierarchy, but
1060 * that does not make much sense these days.
1062 if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
1063 continue;
1064 dst_name = xstrdup(src->name);
1066 } else {
1067 const char *dst_side = pat->dst ? pat->dst : pat->src;
1068 dst_name = xmalloc(strlen(dst_side) +
1069 strlen(src->name) -
1070 strlen(pat->src) + 2);
1071 strcpy(dst_name, dst_side);
1072 strcat(dst_name, src->name + strlen(pat->src));
1074 dst_peer = find_ref_by_name(dst, dst_name);
1075 if (dst_peer) {
1076 if (dst_peer->peer_ref)
1077 /* We're already sending something to this ref. */
1078 goto free_name;
1080 } else {
1081 if (pat->matching && !(send_all || send_mirror))
1083 * Remote doesn't have it, and we have no
1084 * explicit pattern, and we don't have
1085 * --all nor --mirror.
1087 goto free_name;
1089 /* Create a new one and link it */
1090 dst_peer = make_linked_ref(dst_name, dst_tail);
1091 hashcpy(dst_peer->new_sha1, src->new_sha1);
1093 dst_peer->peer_ref = src;
1094 dst_peer->force = pat->force;
1095 free_name:
1096 free(dst_name);
1098 return 0;
1101 struct branch *branch_get(const char *name)
1103 struct branch *ret;
1105 read_config();
1106 if (!name || !*name || !strcmp(name, "HEAD"))
1107 ret = current_branch;
1108 else
1109 ret = make_branch(name, 0);
1110 if (ret && ret->remote_name) {
1111 ret->remote = remote_get(ret->remote_name);
1112 if (ret->merge_nr) {
1113 int i;
1114 ret->merge = xcalloc(sizeof(*ret->merge),
1115 ret->merge_nr);
1116 for (i = 0; i < ret->merge_nr; i++) {
1117 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1118 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1119 remote_find_tracking(ret->remote,
1120 ret->merge[i]);
1124 return ret;
1127 int branch_has_merge_config(struct branch *branch)
1129 return branch && !!branch->merge;
1132 int branch_merge_matches(struct branch *branch,
1133 int i,
1134 const char *refname)
1136 if (!branch || i < 0 || i >= branch->merge_nr)
1137 return 0;
1138 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1141 static struct ref *get_expanded_map(const struct ref *remote_refs,
1142 const struct refspec *refspec)
1144 const struct ref *ref;
1145 struct ref *ret = NULL;
1146 struct ref **tail = &ret;
1148 int remote_prefix_len = strlen(refspec->src);
1149 int local_prefix_len = strlen(refspec->dst);
1151 for (ref = remote_refs; ref; ref = ref->next) {
1152 if (strchr(ref->name, '^'))
1153 continue; /* a dereference item */
1154 if (!prefixcmp(ref->name, refspec->src)) {
1155 const char *match;
1156 struct ref *cpy = copy_ref(ref);
1157 match = ref->name + remote_prefix_len;
1159 cpy->peer_ref = alloc_ref_with_prefix(refspec->dst,
1160 local_prefix_len, match);
1161 if (refspec->force)
1162 cpy->peer_ref->force = 1;
1163 *tail = cpy;
1164 tail = &cpy->next;
1168 return ret;
1171 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1173 const struct ref *ref;
1174 for (ref = refs; ref; ref = ref->next) {
1175 if (refname_match(name, ref->name, ref_fetch_rules))
1176 return ref;
1178 return NULL;
1181 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1183 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1185 if (!ref)
1186 return NULL;
1188 return copy_ref(ref);
1191 static struct ref *get_local_ref(const char *name)
1193 if (!name)
1194 return NULL;
1196 if (!prefixcmp(name, "refs/"))
1197 return alloc_ref(name);
1199 if (!prefixcmp(name, "heads/") ||
1200 !prefixcmp(name, "tags/") ||
1201 !prefixcmp(name, "remotes/"))
1202 return alloc_ref_with_prefix("refs/", 5, name);
1204 return alloc_ref_with_prefix("refs/heads/", 11, name);
1207 int get_fetch_map(const struct ref *remote_refs,
1208 const struct refspec *refspec,
1209 struct ref ***tail,
1210 int missing_ok)
1212 struct ref *ref_map, **rmp;
1214 if (refspec->pattern) {
1215 ref_map = get_expanded_map(remote_refs, refspec);
1216 } else {
1217 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1219 ref_map = get_remote_ref(remote_refs, name);
1220 if (!missing_ok && !ref_map)
1221 die("Couldn't find remote ref %s", name);
1222 if (ref_map) {
1223 ref_map->peer_ref = get_local_ref(refspec->dst);
1224 if (ref_map->peer_ref && refspec->force)
1225 ref_map->peer_ref->force = 1;
1229 for (rmp = &ref_map; *rmp; ) {
1230 if ((*rmp)->peer_ref) {
1231 int st = check_ref_format((*rmp)->peer_ref->name + 5);
1232 if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
1233 struct ref *ignore = *rmp;
1234 error("* Ignoring funny ref '%s' locally",
1235 (*rmp)->peer_ref->name);
1236 *rmp = (*rmp)->next;
1237 free(ignore->peer_ref);
1238 free(ignore);
1239 continue;
1242 rmp = &((*rmp)->next);
1245 if (ref_map)
1246 tail_link_ref(ref_map, tail);
1248 return 0;
1251 int resolve_remote_symref(struct ref *ref, struct ref *list)
1253 if (!ref->symref)
1254 return 0;
1255 for (; list; list = list->next)
1256 if (!strcmp(ref->symref, list->name)) {
1257 hashcpy(ref->old_sha1, list->old_sha1);
1258 return 0;
1260 return 1;
1264 * Return true if there is anything to report, otherwise false.
1266 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1268 unsigned char sha1[20];
1269 struct commit *ours, *theirs;
1270 char symmetric[84];
1271 struct rev_info revs;
1272 const char *rev_argv[10], *base;
1273 int rev_argc;
1276 * Nothing to report unless we are marked to build on top of
1277 * somebody else.
1279 if (!branch ||
1280 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1281 return 0;
1284 * If what we used to build on no longer exists, there is
1285 * nothing to report.
1287 base = branch->merge[0]->dst;
1288 if (!resolve_ref(base, sha1, 1, NULL))
1289 return 0;
1290 theirs = lookup_commit(sha1);
1291 if (!theirs)
1292 return 0;
1294 if (!resolve_ref(branch->refname, sha1, 1, NULL))
1295 return 0;
1296 ours = lookup_commit(sha1);
1297 if (!ours)
1298 return 0;
1300 /* are we the same? */
1301 if (theirs == ours)
1302 return 0;
1304 /* Run "rev-list --left-right ours...theirs" internally... */
1305 rev_argc = 0;
1306 rev_argv[rev_argc++] = NULL;
1307 rev_argv[rev_argc++] = "--left-right";
1308 rev_argv[rev_argc++] = symmetric;
1309 rev_argv[rev_argc++] = "--";
1310 rev_argv[rev_argc] = NULL;
1312 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1313 strcpy(symmetric + 40, "...");
1314 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1316 init_revisions(&revs, NULL);
1317 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1318 prepare_revision_walk(&revs);
1320 /* ... and count the commits on each side. */
1321 *num_ours = 0;
1322 *num_theirs = 0;
1323 while (1) {
1324 struct commit *c = get_revision(&revs);
1325 if (!c)
1326 break;
1327 if (c->object.flags & SYMMETRIC_LEFT)
1328 (*num_ours)++;
1329 else
1330 (*num_theirs)++;
1333 /* clear object flags smudged by the above traversal */
1334 clear_commit_marks(ours, ALL_REV_FLAGS);
1335 clear_commit_marks(theirs, ALL_REV_FLAGS);
1336 return 1;
1340 * Return true when there is anything to report, otherwise false.
1342 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1344 int num_ours, num_theirs;
1345 const char *base;
1347 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1348 return 0;
1350 base = branch->merge[0]->dst;
1351 if (!prefixcmp(base, "refs/remotes/")) {
1352 base += strlen("refs/remotes/");
1354 if (!num_theirs)
1355 strbuf_addf(sb, "Your branch is ahead of '%s' "
1356 "by %d commit%s.\n",
1357 base, num_ours, (num_ours == 1) ? "" : "s");
1358 else if (!num_ours)
1359 strbuf_addf(sb, "Your branch is behind '%s' "
1360 "by %d commit%s, "
1361 "and can be fast-forwarded.\n",
1362 base, num_theirs, (num_theirs == 1) ? "" : "s");
1363 else
1364 strbuf_addf(sb, "Your branch and '%s' have diverged,\n"
1365 "and have %d and %d different commit(s) each, "
1366 "respectively.\n",
1367 base, num_ours, num_theirs);
1368 return 1;