Merge branch 'maint-1.5.6' into maint-1.6.0
[git/spearce.git] / remote.c
blob91f1b7cd81f5461b13c2553bf3dd3e4b5c76ab14
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 = malloc(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 = malloc(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 while (fgets(buffer, BUF_SIZE, f)) {
205 int value_list;
206 char *s, *p;
208 if (!prefixcmp(buffer, "URL:")) {
209 value_list = 0;
210 s = buffer + 4;
211 } else if (!prefixcmp(buffer, "Push:")) {
212 value_list = 1;
213 s = buffer + 5;
214 } else if (!prefixcmp(buffer, "Pull:")) {
215 value_list = 2;
216 s = buffer + 5;
217 } else
218 continue;
220 while (isspace(*s))
221 s++;
222 if (!*s)
223 continue;
225 p = s + strlen(s);
226 while (isspace(p[-1]))
227 *--p = 0;
229 switch (value_list) {
230 case 0:
231 add_url_alias(remote, xstrdup(s));
232 break;
233 case 1:
234 add_push_refspec(remote, xstrdup(s));
235 break;
236 case 2:
237 add_fetch_refspec(remote, xstrdup(s));
238 break;
241 fclose(f);
244 static void read_branches_file(struct remote *remote)
246 const char *slash = strchr(remote->name, '/');
247 char *frag;
248 struct strbuf branch;
249 int n = slash ? slash - remote->name : 1000;
250 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
251 char *s, *p;
252 int len;
254 if (!f)
255 return;
256 s = fgets(buffer, BUF_SIZE, f);
257 fclose(f);
258 if (!s)
259 return;
260 while (isspace(*s))
261 s++;
262 if (!*s)
263 return;
264 p = s + strlen(s);
265 while (isspace(p[-1]))
266 *--p = 0;
267 len = p - s;
268 if (slash)
269 len += strlen(slash);
270 p = xmalloc(len + 1);
271 strcpy(p, s);
272 if (slash)
273 strcat(p, slash);
276 * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
277 * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
278 * the partial URL obtained from the branches file plus
279 * "/netdev-2.6" and does not store it in any tracking ref.
280 * #branch specifier in the file is ignored.
282 * Otherwise, the branches file would have URL and optionally
283 * #branch specified. The "master" (or specified) branch is
284 * fetched and stored in the local branch of the same name.
286 strbuf_init(&branch, 0);
287 frag = strchr(p, '#');
288 if (frag) {
289 *(frag++) = '\0';
290 strbuf_addf(&branch, "refs/heads/%s", frag);
291 } else
292 strbuf_addstr(&branch, "refs/heads/master");
293 if (!slash) {
294 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
295 } else {
296 strbuf_reset(&branch);
297 strbuf_addstr(&branch, "HEAD:");
299 add_url_alias(remote, p);
300 add_fetch_refspec(remote, strbuf_detach(&branch, 0));
302 * Cogito compatible push: push current HEAD to remote #branch
303 * (master if missing)
305 strbuf_init(&branch, 0);
306 strbuf_addstr(&branch, "HEAD");
307 if (frag)
308 strbuf_addf(&branch, ":refs/heads/%s", frag);
309 else
310 strbuf_addstr(&branch, ":refs/heads/master");
311 add_push_refspec(remote, strbuf_detach(&branch, 0));
312 remote->fetch_tags = 1; /* always auto-follow */
315 static int handle_config(const char *key, const char *value, void *cb)
317 const char *name;
318 const char *subkey;
319 struct remote *remote;
320 struct branch *branch;
321 if (!prefixcmp(key, "branch.")) {
322 name = key + 7;
323 subkey = strrchr(name, '.');
324 if (!subkey)
325 return 0;
326 branch = make_branch(name, subkey - name);
327 if (!strcmp(subkey, ".remote")) {
328 if (!value)
329 return config_error_nonbool(key);
330 branch->remote_name = xstrdup(value);
331 if (branch == current_branch)
332 default_remote_name = branch->remote_name;
333 } else if (!strcmp(subkey, ".merge")) {
334 if (!value)
335 return config_error_nonbool(key);
336 add_merge(branch, xstrdup(value));
338 return 0;
340 if (!prefixcmp(key, "url.")) {
341 struct rewrite *rewrite;
342 name = key + 4;
343 subkey = strrchr(name, '.');
344 if (!subkey)
345 return 0;
346 rewrite = make_rewrite(name, subkey - name);
347 if (!strcmp(subkey, ".insteadof")) {
348 if (!value)
349 return config_error_nonbool(key);
350 add_instead_of(rewrite, xstrdup(value));
353 if (prefixcmp(key, "remote."))
354 return 0;
355 name = key + 7;
356 if (*name == '/') {
357 warning("Config remote shorthand cannot begin with '/': %s",
358 name);
359 return 0;
361 subkey = strrchr(name, '.');
362 if (!subkey)
363 return error("Config with no key for remote %s", name);
364 remote = make_remote(name, subkey - name);
365 if (!strcmp(subkey, ".mirror"))
366 remote->mirror = git_config_bool(key, value);
367 else if (!strcmp(subkey, ".skipdefaultupdate"))
368 remote->skip_default_update = git_config_bool(key, value);
370 else if (!strcmp(subkey, ".url")) {
371 const char *v;
372 if (git_config_string(&v, key, value))
373 return -1;
374 add_url(remote, v);
375 } else if (!strcmp(subkey, ".push")) {
376 const char *v;
377 if (git_config_string(&v, key, value))
378 return -1;
379 add_push_refspec(remote, v);
380 } else if (!strcmp(subkey, ".fetch")) {
381 const char *v;
382 if (git_config_string(&v, key, value))
383 return -1;
384 add_fetch_refspec(remote, v);
385 } else if (!strcmp(subkey, ".receivepack")) {
386 const char *v;
387 if (git_config_string(&v, key, value))
388 return -1;
389 if (!remote->receivepack)
390 remote->receivepack = v;
391 else
392 error("more than one receivepack given, using the first");
393 } else if (!strcmp(subkey, ".uploadpack")) {
394 const char *v;
395 if (git_config_string(&v, key, value))
396 return -1;
397 if (!remote->uploadpack)
398 remote->uploadpack = v;
399 else
400 error("more than one uploadpack given, using the first");
401 } else if (!strcmp(subkey, ".tagopt")) {
402 if (!strcmp(value, "--no-tags"))
403 remote->fetch_tags = -1;
404 } else if (!strcmp(subkey, ".proxy")) {
405 return git_config_string((const char **)&remote->http_proxy,
406 key, value);
408 return 0;
411 static void alias_all_urls(void)
413 int i, j;
414 for (i = 0; i < remotes_nr; i++) {
415 if (!remotes[i])
416 continue;
417 for (j = 0; j < remotes[i]->url_nr; j++) {
418 remotes[i]->url[j] = alias_url(remotes[i]->url[j]);
423 static void read_config(void)
425 unsigned char sha1[20];
426 const char *head_ref;
427 int flag;
428 if (default_remote_name) // did this already
429 return;
430 default_remote_name = xstrdup("origin");
431 current_branch = NULL;
432 head_ref = resolve_ref("HEAD", sha1, 0, &flag);
433 if (head_ref && (flag & REF_ISSYMREF) &&
434 !prefixcmp(head_ref, "refs/heads/")) {
435 current_branch =
436 make_branch(head_ref + strlen("refs/heads/"), 0);
438 git_config(handle_config, NULL);
439 alias_all_urls();
443 * We need to make sure the tracking branches are well formed, but a
444 * wildcard refspec in "struct refspec" must have a trailing slash. We
445 * temporarily drop the trailing '/' while calling check_ref_format(),
446 * and put it back. The caller knows that a CHECK_REF_FORMAT_ONELEVEL
447 * error return is Ok for a wildcard refspec.
449 static int verify_refname(char *name, int is_glob)
451 int result, len = -1;
453 if (is_glob) {
454 len = strlen(name);
455 assert(name[len - 1] == '/');
456 name[len - 1] = '\0';
458 result = check_ref_format(name);
459 if (is_glob)
460 name[len - 1] = '/';
461 return result;
464 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
466 int i;
467 int st;
468 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
470 for (i = 0; i < nr_refspec; i++) {
471 size_t llen;
472 int is_glob;
473 const char *lhs, *rhs;
475 llen = is_glob = 0;
477 lhs = refspec[i];
478 if (*lhs == '+') {
479 rs[i].force = 1;
480 lhs++;
483 rhs = strrchr(lhs, ':');
486 * Before going on, special case ":" (or "+:") as a refspec
487 * for matching refs.
489 if (!fetch && rhs == lhs && rhs[1] == '\0') {
490 rs[i].matching = 1;
491 continue;
494 if (rhs) {
495 size_t rlen = strlen(++rhs);
496 is_glob = (2 <= rlen && !strcmp(rhs + rlen - 2, "/*"));
497 rs[i].dst = xstrndup(rhs, rlen - is_glob);
500 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
501 if (2 <= llen && !memcmp(lhs + llen - 2, "/*", 2)) {
502 if ((rhs && !is_glob) || (!rhs && fetch))
503 goto invalid;
504 is_glob = 1;
505 llen--;
506 } else if (rhs && is_glob) {
507 goto invalid;
510 rs[i].pattern = is_glob;
511 rs[i].src = xstrndup(lhs, llen);
513 if (fetch) {
515 * LHS
516 * - empty is allowed; it means HEAD.
517 * - otherwise it must be a valid looking ref.
519 if (!*rs[i].src)
520 ; /* empty is ok */
521 else {
522 st = verify_refname(rs[i].src, is_glob);
523 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
524 goto invalid;
527 * RHS
528 * - missing is ok, and is same as empty.
529 * - empty is ok; it means not to store.
530 * - otherwise it must be a valid looking ref.
532 if (!rs[i].dst) {
533 ; /* ok */
534 } else if (!*rs[i].dst) {
535 ; /* ok */
536 } else {
537 st = verify_refname(rs[i].dst, is_glob);
538 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
539 goto invalid;
541 } else {
543 * LHS
544 * - empty is allowed; it means delete.
545 * - when wildcarded, it must be a valid looking ref.
546 * - otherwise, it must be an extended SHA-1, but
547 * there is no existing way to validate this.
549 if (!*rs[i].src)
550 ; /* empty is ok */
551 else if (is_glob) {
552 st = verify_refname(rs[i].src, is_glob);
553 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
554 goto invalid;
556 else
557 ; /* anything goes, for now */
559 * RHS
560 * - missing is allowed, but LHS then must be a
561 * valid looking ref.
562 * - empty is not allowed.
563 * - otherwise it must be a valid looking ref.
565 if (!rs[i].dst) {
566 st = verify_refname(rs[i].src, is_glob);
567 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
568 goto invalid;
569 } else if (!*rs[i].dst) {
570 goto invalid;
571 } else {
572 st = verify_refname(rs[i].dst, is_glob);
573 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
574 goto invalid;
578 return rs;
580 invalid:
581 if (verify) {
582 free(rs);
583 return NULL;
585 die("Invalid refspec '%s'", refspec[i]);
588 int valid_fetch_refspec(const char *fetch_refspec_str)
590 const char *fetch_refspec[] = { fetch_refspec_str };
591 struct refspec *refspec;
593 refspec = parse_refspec_internal(1, fetch_refspec, 1, 1);
594 free(refspec);
595 return !!refspec;
598 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
600 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
603 struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
605 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
608 static int valid_remote_nick(const char *name)
610 if (!name[0] || /* not empty */
611 (name[0] == '.' && /* not "." */
612 (!name[1] || /* not ".." */
613 (name[1] == '.' && !name[2]))))
614 return 0;
615 return !strchr(name, '/'); /* no slash */
618 struct remote *remote_get(const char *name)
620 struct remote *ret;
622 read_config();
623 if (!name)
624 name = default_remote_name;
625 ret = make_remote(name, 0);
626 if (valid_remote_nick(name)) {
627 if (!ret->url)
628 read_remotes_file(ret);
629 if (!ret->url)
630 read_branches_file(ret);
632 if (!ret->url)
633 add_url_alias(ret, name);
634 if (!ret->url)
635 return NULL;
636 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
637 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
638 return ret;
641 int for_each_remote(each_remote_fn fn, void *priv)
643 int i, result = 0;
644 read_config();
645 for (i = 0; i < remotes_nr && !result; i++) {
646 struct remote *r = remotes[i];
647 if (!r)
648 continue;
649 if (!r->fetch)
650 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
651 r->fetch_refspec);
652 if (!r->push)
653 r->push = parse_push_refspec(r->push_refspec_nr,
654 r->push_refspec);
655 result = fn(r, priv);
657 return result;
660 void ref_remove_duplicates(struct ref *ref_map)
662 struct ref **posn;
663 struct ref *next;
664 for (; ref_map; ref_map = ref_map->next) {
665 if (!ref_map->peer_ref)
666 continue;
667 posn = &ref_map->next;
668 while (*posn) {
669 if ((*posn)->peer_ref &&
670 !strcmp((*posn)->peer_ref->name,
671 ref_map->peer_ref->name)) {
672 if (strcmp((*posn)->name, ref_map->name))
673 die("%s tracks both %s and %s",
674 ref_map->peer_ref->name,
675 (*posn)->name, ref_map->name);
676 next = (*posn)->next;
677 free((*posn)->peer_ref);
678 free(*posn);
679 *posn = next;
680 } else {
681 posn = &(*posn)->next;
687 int remote_has_url(struct remote *remote, const char *url)
689 int i;
690 for (i = 0; i < remote->url_nr; i++) {
691 if (!strcmp(remote->url[i], url))
692 return 1;
694 return 0;
697 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
699 int find_src = refspec->src == NULL;
700 char *needle, **result;
701 int i;
703 if (find_src) {
704 if (!refspec->dst)
705 return error("find_tracking: need either src or dst");
706 needle = refspec->dst;
707 result = &refspec->src;
708 } else {
709 needle = refspec->src;
710 result = &refspec->dst;
713 for (i = 0; i < remote->fetch_refspec_nr; i++) {
714 struct refspec *fetch = &remote->fetch[i];
715 const char *key = find_src ? fetch->dst : fetch->src;
716 const char *value = find_src ? fetch->src : fetch->dst;
717 if (!fetch->dst)
718 continue;
719 if (fetch->pattern) {
720 if (!prefixcmp(needle, key)) {
721 *result = xmalloc(strlen(value) +
722 strlen(needle) -
723 strlen(key) + 1);
724 strcpy(*result, value);
725 strcpy(*result + strlen(value),
726 needle + strlen(key));
727 refspec->force = fetch->force;
728 return 0;
730 } else if (!strcmp(needle, key)) {
731 *result = xstrdup(value);
732 refspec->force = fetch->force;
733 return 0;
736 return -1;
739 struct ref *alloc_ref(unsigned namelen)
741 struct ref *ret = xmalloc(sizeof(struct ref) + namelen);
742 memset(ret, 0, sizeof(struct ref) + namelen);
743 return ret;
746 struct ref *alloc_ref_from_str(const char* str)
748 struct ref *ret = alloc_ref(strlen(str) + 1);
749 strcpy(ret->name, str);
750 return ret;
753 static struct ref *copy_ref(const struct ref *ref)
755 struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
756 memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
757 ret->next = NULL;
758 return ret;
761 struct ref *copy_ref_list(const struct ref *ref)
763 struct ref *ret = NULL;
764 struct ref **tail = &ret;
765 while (ref) {
766 *tail = copy_ref(ref);
767 ref = ref->next;
768 tail = &((*tail)->next);
770 return ret;
773 void free_ref(struct ref *ref)
775 if (!ref)
776 return;
777 free(ref->remote_status);
778 free(ref->symref);
779 free(ref);
782 void free_refs(struct ref *ref)
784 struct ref *next;
785 while (ref) {
786 next = ref->next;
787 free(ref->peer_ref);
788 free_ref(ref);
789 ref = next;
793 static int count_refspec_match(const char *pattern,
794 struct ref *refs,
795 struct ref **matched_ref)
797 int patlen = strlen(pattern);
798 struct ref *matched_weak = NULL;
799 struct ref *matched = NULL;
800 int weak_match = 0;
801 int match = 0;
803 for (weak_match = match = 0; refs; refs = refs->next) {
804 char *name = refs->name;
805 int namelen = strlen(name);
807 if (!refname_match(pattern, name, ref_rev_parse_rules))
808 continue;
810 /* A match is "weak" if it is with refs outside
811 * heads or tags, and did not specify the pattern
812 * in full (e.g. "refs/remotes/origin/master") or at
813 * least from the toplevel (e.g. "remotes/origin/master");
814 * otherwise "git push $URL master" would result in
815 * ambiguity between remotes/origin/master and heads/master
816 * at the remote site.
818 if (namelen != patlen &&
819 patlen != namelen - 5 &&
820 prefixcmp(name, "refs/heads/") &&
821 prefixcmp(name, "refs/tags/")) {
822 /* We want to catch the case where only weak
823 * matches are found and there are multiple
824 * matches, and where more than one strong
825 * matches are found, as ambiguous. One
826 * strong match with zero or more weak matches
827 * are acceptable as a unique match.
829 matched_weak = refs;
830 weak_match++;
832 else {
833 matched = refs;
834 match++;
837 if (!matched) {
838 *matched_ref = matched_weak;
839 return weak_match;
841 else {
842 *matched_ref = matched;
843 return match;
847 static void tail_link_ref(struct ref *ref, struct ref ***tail)
849 **tail = ref;
850 while (ref->next)
851 ref = ref->next;
852 *tail = &ref->next;
855 static struct ref *try_explicit_object_name(const char *name)
857 unsigned char sha1[20];
858 struct ref *ref;
860 if (!*name) {
861 ref = alloc_ref(20);
862 strcpy(ref->name, "(delete)");
863 hashclr(ref->new_sha1);
864 return ref;
866 if (get_sha1(name, sha1))
867 return NULL;
868 ref = alloc_ref_from_str(name);
869 hashcpy(ref->new_sha1, sha1);
870 return ref;
873 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
875 struct ref *ret = alloc_ref_from_str(name);
876 tail_link_ref(ret, tail);
877 return ret;
880 static char *guess_ref(const char *name, struct ref *peer)
882 struct strbuf buf = STRBUF_INIT;
883 unsigned char sha1[20];
885 const char *r = resolve_ref(peer->name, sha1, 1, NULL);
886 if (!r)
887 return NULL;
889 if (!prefixcmp(r, "refs/heads/"))
890 strbuf_addstr(&buf, "refs/heads/");
891 else if (!prefixcmp(r, "refs/tags/"))
892 strbuf_addstr(&buf, "refs/tags/");
893 else
894 return NULL;
896 strbuf_addstr(&buf, name);
897 return strbuf_detach(&buf, NULL);
900 static int match_explicit(struct ref *src, struct ref *dst,
901 struct ref ***dst_tail,
902 struct refspec *rs)
904 struct ref *matched_src, *matched_dst;
906 const char *dst_value = rs->dst;
907 char *dst_guess;
909 if (rs->pattern || rs->matching)
910 return 0;
912 matched_src = matched_dst = NULL;
913 switch (count_refspec_match(rs->src, src, &matched_src)) {
914 case 1:
915 break;
916 case 0:
917 /* The source could be in the get_sha1() format
918 * not a reference name. :refs/other is a
919 * way to delete 'other' ref at the remote end.
921 matched_src = try_explicit_object_name(rs->src);
922 if (!matched_src)
923 return error("src refspec %s does not match any.", rs->src);
924 break;
925 default:
926 return error("src refspec %s matches more than one.", rs->src);
929 if (!dst_value) {
930 unsigned char sha1[20];
931 int flag;
933 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
934 if (!dst_value ||
935 ((flag & REF_ISSYMREF) &&
936 prefixcmp(dst_value, "refs/heads/")))
937 die("%s cannot be resolved to branch.",
938 matched_src->name);
941 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
942 case 1:
943 break;
944 case 0:
945 if (!memcmp(dst_value, "refs/", 5))
946 matched_dst = make_linked_ref(dst_value, dst_tail);
947 else if((dst_guess = guess_ref(dst_value, matched_src)))
948 matched_dst = make_linked_ref(dst_guess, dst_tail);
949 else
950 error("unable to push to unqualified destination: %s\n"
951 "The destination refspec neither matches an "
952 "existing ref on the remote nor\n"
953 "begins with refs/, and we are unable to "
954 "guess a prefix based on the source ref.",
955 dst_value);
956 break;
957 default:
958 matched_dst = NULL;
959 error("dst refspec %s matches more than one.",
960 dst_value);
961 break;
963 if (!matched_dst)
964 return -1;
965 if (matched_dst->peer_ref)
966 return error("dst ref %s receives from more than one src.",
967 matched_dst->name);
968 else {
969 matched_dst->peer_ref = matched_src;
970 matched_dst->force = rs->force;
972 return 0;
975 static int match_explicit_refs(struct ref *src, struct ref *dst,
976 struct ref ***dst_tail, struct refspec *rs,
977 int rs_nr)
979 int i, errs;
980 for (i = errs = 0; i < rs_nr; i++)
981 errs += match_explicit(src, dst, dst_tail, &rs[i]);
982 return errs;
985 static const struct refspec *check_pattern_match(const struct refspec *rs,
986 int rs_nr,
987 const struct ref *src)
989 int i;
990 int matching_refs = -1;
991 for (i = 0; i < rs_nr; i++) {
992 if (rs[i].matching &&
993 (matching_refs == -1 || rs[i].force)) {
994 matching_refs = i;
995 continue;
998 if (rs[i].pattern && !prefixcmp(src->name, rs[i].src))
999 return rs + i;
1001 if (matching_refs != -1)
1002 return rs + matching_refs;
1003 else
1004 return NULL;
1008 * Note. This is used only by "push"; refspec matching rules for
1009 * push and fetch are subtly different, so do not try to reuse it
1010 * without thinking.
1012 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
1013 int nr_refspec, const char **refspec, int flags)
1015 struct refspec *rs;
1016 int send_all = flags & MATCH_REFS_ALL;
1017 int send_mirror = flags & MATCH_REFS_MIRROR;
1018 static const char *default_refspec[] = { ":", 0 };
1020 if (!nr_refspec) {
1021 nr_refspec = 1;
1022 refspec = default_refspec;
1024 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1025 if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
1026 return -1;
1028 /* pick the remainder */
1029 for ( ; src; src = src->next) {
1030 struct ref *dst_peer;
1031 const struct refspec *pat = NULL;
1032 char *dst_name;
1033 if (src->peer_ref)
1034 continue;
1036 pat = check_pattern_match(rs, nr_refspec, src);
1037 if (!pat)
1038 continue;
1040 if (pat->matching) {
1042 * "matching refs"; traditionally we pushed everything
1043 * including refs outside refs/heads/ hierarchy, but
1044 * that does not make much sense these days.
1046 if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
1047 continue;
1048 dst_name = xstrdup(src->name);
1050 } else {
1051 const char *dst_side = pat->dst ? pat->dst : pat->src;
1052 dst_name = xmalloc(strlen(dst_side) +
1053 strlen(src->name) -
1054 strlen(pat->src) + 2);
1055 strcpy(dst_name, dst_side);
1056 strcat(dst_name, src->name + strlen(pat->src));
1058 dst_peer = find_ref_by_name(dst, dst_name);
1059 if (dst_peer) {
1060 if (dst_peer->peer_ref)
1061 /* We're already sending something to this ref. */
1062 goto free_name;
1064 } else {
1065 if (pat->matching && !(send_all || send_mirror))
1067 * Remote doesn't have it, and we have no
1068 * explicit pattern, and we don't have
1069 * --all nor --mirror.
1071 goto free_name;
1073 /* Create a new one and link it */
1074 dst_peer = make_linked_ref(dst_name, dst_tail);
1075 hashcpy(dst_peer->new_sha1, src->new_sha1);
1077 dst_peer->peer_ref = src;
1078 dst_peer->force = pat->force;
1079 free_name:
1080 free(dst_name);
1082 return 0;
1085 struct branch *branch_get(const char *name)
1087 struct branch *ret;
1089 read_config();
1090 if (!name || !*name || !strcmp(name, "HEAD"))
1091 ret = current_branch;
1092 else
1093 ret = make_branch(name, 0);
1094 if (ret && ret->remote_name) {
1095 ret->remote = remote_get(ret->remote_name);
1096 if (ret->merge_nr) {
1097 int i;
1098 ret->merge = xcalloc(sizeof(*ret->merge),
1099 ret->merge_nr);
1100 for (i = 0; i < ret->merge_nr; i++) {
1101 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1102 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1103 remote_find_tracking(ret->remote,
1104 ret->merge[i]);
1108 return ret;
1111 int branch_has_merge_config(struct branch *branch)
1113 return branch && !!branch->merge;
1116 int branch_merge_matches(struct branch *branch,
1117 int i,
1118 const char *refname)
1120 if (!branch || i < 0 || i >= branch->merge_nr)
1121 return 0;
1122 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1125 static struct ref *get_expanded_map(const struct ref *remote_refs,
1126 const struct refspec *refspec)
1128 const struct ref *ref;
1129 struct ref *ret = NULL;
1130 struct ref **tail = &ret;
1132 int remote_prefix_len = strlen(refspec->src);
1133 int local_prefix_len = strlen(refspec->dst);
1135 for (ref = remote_refs; ref; ref = ref->next) {
1136 if (strchr(ref->name, '^'))
1137 continue; /* a dereference item */
1138 if (!prefixcmp(ref->name, refspec->src)) {
1139 const char *match;
1140 struct ref *cpy = copy_ref(ref);
1141 match = ref->name + remote_prefix_len;
1143 cpy->peer_ref = alloc_ref(local_prefix_len +
1144 strlen(match) + 1);
1145 sprintf(cpy->peer_ref->name, "%s%s",
1146 refspec->dst, match);
1147 if (refspec->force)
1148 cpy->peer_ref->force = 1;
1149 *tail = cpy;
1150 tail = &cpy->next;
1154 return ret;
1157 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1159 const struct ref *ref;
1160 for (ref = refs; ref; ref = ref->next) {
1161 if (refname_match(name, ref->name, ref_fetch_rules))
1162 return ref;
1164 return NULL;
1167 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1169 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1171 if (!ref)
1172 return NULL;
1174 return copy_ref(ref);
1177 static struct ref *get_local_ref(const char *name)
1179 struct ref *ret;
1180 if (!name)
1181 return NULL;
1183 if (!prefixcmp(name, "refs/")) {
1184 return alloc_ref_from_str(name);
1187 if (!prefixcmp(name, "heads/") ||
1188 !prefixcmp(name, "tags/") ||
1189 !prefixcmp(name, "remotes/")) {
1190 ret = alloc_ref(strlen(name) + 6);
1191 sprintf(ret->name, "refs/%s", name);
1192 return ret;
1195 ret = alloc_ref(strlen(name) + 12);
1196 sprintf(ret->name, "refs/heads/%s", name);
1197 return ret;
1200 int get_fetch_map(const struct ref *remote_refs,
1201 const struct refspec *refspec,
1202 struct ref ***tail,
1203 int missing_ok)
1205 struct ref *ref_map, **rmp;
1207 if (refspec->pattern) {
1208 ref_map = get_expanded_map(remote_refs, refspec);
1209 } else {
1210 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1212 ref_map = get_remote_ref(remote_refs, name);
1213 if (!missing_ok && !ref_map)
1214 die("Couldn't find remote ref %s", name);
1215 if (ref_map) {
1216 ref_map->peer_ref = get_local_ref(refspec->dst);
1217 if (ref_map->peer_ref && refspec->force)
1218 ref_map->peer_ref->force = 1;
1222 for (rmp = &ref_map; *rmp; ) {
1223 if ((*rmp)->peer_ref) {
1224 int st = check_ref_format((*rmp)->peer_ref->name + 5);
1225 if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
1226 struct ref *ignore = *rmp;
1227 error("* Ignoring funny ref '%s' locally",
1228 (*rmp)->peer_ref->name);
1229 *rmp = (*rmp)->next;
1230 free(ignore->peer_ref);
1231 free(ignore);
1232 continue;
1235 rmp = &((*rmp)->next);
1238 if (ref_map)
1239 tail_link_ref(ref_map, tail);
1241 return 0;
1244 int resolve_remote_symref(struct ref *ref, struct ref *list)
1246 if (!ref->symref)
1247 return 0;
1248 for (; list; list = list->next)
1249 if (!strcmp(ref->symref, list->name)) {
1250 hashcpy(ref->old_sha1, list->old_sha1);
1251 return 0;
1253 return 1;
1257 * Return true if there is anything to report, otherwise false.
1259 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1261 unsigned char sha1[20];
1262 struct commit *ours, *theirs;
1263 char symmetric[84];
1264 struct rev_info revs;
1265 const char *rev_argv[10], *base;
1266 int rev_argc;
1269 * Nothing to report unless we are marked to build on top of
1270 * somebody else.
1272 if (!branch ||
1273 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1274 return 0;
1277 * If what we used to build on no longer exists, there is
1278 * nothing to report.
1280 base = branch->merge[0]->dst;
1281 if (!resolve_ref(base, sha1, 1, NULL))
1282 return 0;
1283 theirs = lookup_commit(sha1);
1284 if (!theirs)
1285 return 0;
1287 if (!resolve_ref(branch->refname, sha1, 1, NULL))
1288 return 0;
1289 ours = lookup_commit(sha1);
1290 if (!ours)
1291 return 0;
1293 /* are we the same? */
1294 if (theirs == ours)
1295 return 0;
1297 /* Run "rev-list --left-right ours...theirs" internally... */
1298 rev_argc = 0;
1299 rev_argv[rev_argc++] = NULL;
1300 rev_argv[rev_argc++] = "--left-right";
1301 rev_argv[rev_argc++] = symmetric;
1302 rev_argv[rev_argc++] = "--";
1303 rev_argv[rev_argc] = NULL;
1305 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1306 strcpy(symmetric + 40, "...");
1307 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1309 init_revisions(&revs, NULL);
1310 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1311 prepare_revision_walk(&revs);
1313 /* ... and count the commits on each side. */
1314 *num_ours = 0;
1315 *num_theirs = 0;
1316 while (1) {
1317 struct commit *c = get_revision(&revs);
1318 if (!c)
1319 break;
1320 if (c->object.flags & SYMMETRIC_LEFT)
1321 (*num_ours)++;
1322 else
1323 (*num_theirs)++;
1326 /* clear object flags smudged by the above traversal */
1327 clear_commit_marks(ours, ALL_REV_FLAGS);
1328 clear_commit_marks(theirs, ALL_REV_FLAGS);
1329 return 1;
1333 * Return true when there is anything to report, otherwise false.
1335 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1337 int num_ours, num_theirs;
1338 const char *base;
1340 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1341 return 0;
1343 base = branch->merge[0]->dst;
1344 if (!prefixcmp(base, "refs/remotes/")) {
1345 base += strlen("refs/remotes/");
1347 if (!num_theirs)
1348 strbuf_addf(sb, "Your branch is ahead of '%s' "
1349 "by %d commit%s.\n",
1350 base, num_ours, (num_ours == 1) ? "" : "s");
1351 else if (!num_ours)
1352 strbuf_addf(sb, "Your branch is behind '%s' "
1353 "by %d commit%s, "
1354 "and can be fast-forwarded.\n",
1355 base, num_theirs, (num_theirs == 1) ? "" : "s");
1356 else
1357 strbuf_addf(sb, "Your branch and '%s' have diverged,\n"
1358 "and have %d and %d different commit(s) each, "
1359 "respectively.\n",
1360 base, num_ours, num_theirs);
1361 return 1;