builtin-fast-export.c: turn error into warning
[git/dscho.git] / remote.c
blobe5d6b100d738c388bff91bff68b14f69dea87166
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"
10 static struct refspec s_tag_refspec = {
14 "refs/tags/*",
15 "refs/tags/*"
18 const struct refspec *tag_refspec = &s_tag_refspec;
20 struct counted_string {
21 size_t len;
22 const char *s;
24 struct rewrite {
25 const char *base;
26 size_t baselen;
27 struct counted_string *instead_of;
28 int instead_of_nr;
29 int instead_of_alloc;
32 static struct remote **remotes;
33 static int remotes_alloc;
34 static int remotes_nr;
36 static struct branch **branches;
37 static int branches_alloc;
38 static int branches_nr;
40 static struct branch *current_branch;
41 static const char *default_remote_name;
42 static int explicit_default_remote_name;
44 static struct rewrite **rewrite;
45 static int rewrite_alloc;
46 static int rewrite_nr;
48 #define BUF_SIZE (2048)
49 static char buffer[BUF_SIZE];
51 static const char *alias_url(const char *url)
53 int i, j;
54 char *ret;
55 struct counted_string *longest;
56 int longest_i;
58 longest = NULL;
59 longest_i = -1;
60 for (i = 0; i < rewrite_nr; i++) {
61 if (!rewrite[i])
62 continue;
63 for (j = 0; j < rewrite[i]->instead_of_nr; j++) {
64 if (!prefixcmp(url, rewrite[i]->instead_of[j].s) &&
65 (!longest ||
66 longest->len < rewrite[i]->instead_of[j].len)) {
67 longest = &(rewrite[i]->instead_of[j]);
68 longest_i = i;
72 if (!longest)
73 return url;
75 ret = xmalloc(rewrite[longest_i]->baselen +
76 (strlen(url) - longest->len) + 1);
77 strcpy(ret, rewrite[longest_i]->base);
78 strcpy(ret + rewrite[longest_i]->baselen, url + longest->len);
79 return ret;
82 static void add_push_refspec(struct remote *remote, const char *ref)
84 ALLOC_GROW(remote->push_refspec,
85 remote->push_refspec_nr + 1,
86 remote->push_refspec_alloc);
87 remote->push_refspec[remote->push_refspec_nr++] = ref;
90 static void add_fetch_refspec(struct remote *remote, const char *ref)
92 ALLOC_GROW(remote->fetch_refspec,
93 remote->fetch_refspec_nr + 1,
94 remote->fetch_refspec_alloc);
95 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
98 static void add_url(struct remote *remote, const char *url)
100 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
101 remote->url[remote->url_nr++] = url;
104 static void add_url_alias(struct remote *remote, const char *url)
106 add_url(remote, alias_url(url));
109 static struct remote *make_remote(const char *name, int len)
111 struct remote *ret;
112 int i;
114 for (i = 0; i < remotes_nr; i++) {
115 if (len ? (!strncmp(name, remotes[i]->name, len) &&
116 !remotes[i]->name[len]) :
117 !strcmp(name, remotes[i]->name))
118 return remotes[i];
121 ret = xcalloc(1, sizeof(struct remote));
122 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
123 remotes[remotes_nr++] = ret;
124 if (len)
125 ret->name = xstrndup(name, len);
126 else
127 ret->name = xstrdup(name);
128 return ret;
131 static void add_merge(struct branch *branch, const char *name)
133 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
134 branch->merge_alloc);
135 branch->merge_name[branch->merge_nr++] = name;
138 static struct branch *make_branch(const char *name, int len)
140 struct branch *ret;
141 int i;
142 char *refname;
144 for (i = 0; i < branches_nr; i++) {
145 if (len ? (!strncmp(name, branches[i]->name, len) &&
146 !branches[i]->name[len]) :
147 !strcmp(name, branches[i]->name))
148 return branches[i];
151 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
152 ret = xcalloc(1, sizeof(struct branch));
153 branches[branches_nr++] = ret;
154 if (len)
155 ret->name = xstrndup(name, len);
156 else
157 ret->name = xstrdup(name);
158 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
159 strcpy(refname, "refs/heads/");
160 strcpy(refname + strlen("refs/heads/"), ret->name);
161 ret->refname = refname;
163 return ret;
166 static struct rewrite *make_rewrite(const char *base, int len)
168 struct rewrite *ret;
169 int i;
171 for (i = 0; i < rewrite_nr; i++) {
172 if (len
173 ? (len == rewrite[i]->baselen &&
174 !strncmp(base, rewrite[i]->base, len))
175 : !strcmp(base, rewrite[i]->base))
176 return rewrite[i];
179 ALLOC_GROW(rewrite, rewrite_nr + 1, rewrite_alloc);
180 ret = xcalloc(1, sizeof(struct rewrite));
181 rewrite[rewrite_nr++] = ret;
182 if (len) {
183 ret->base = xstrndup(base, len);
184 ret->baselen = len;
186 else {
187 ret->base = xstrdup(base);
188 ret->baselen = strlen(base);
190 return ret;
193 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
195 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
196 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
197 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
198 rewrite->instead_of_nr++;
201 static void read_remotes_file(struct remote *remote)
203 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
205 if (!f)
206 return;
207 remote->origin = REMOTE_REMOTES;
208 while (fgets(buffer, BUF_SIZE, f)) {
209 int value_list;
210 char *s, *p;
212 if (!prefixcmp(buffer, "URL:")) {
213 value_list = 0;
214 s = buffer + 4;
215 } else if (!prefixcmp(buffer, "Push:")) {
216 value_list = 1;
217 s = buffer + 5;
218 } else if (!prefixcmp(buffer, "Pull:")) {
219 value_list = 2;
220 s = buffer + 5;
221 } else
222 continue;
224 while (isspace(*s))
225 s++;
226 if (!*s)
227 continue;
229 p = s + strlen(s);
230 while (isspace(p[-1]))
231 *--p = 0;
233 switch (value_list) {
234 case 0:
235 add_url_alias(remote, xstrdup(s));
236 break;
237 case 1:
238 add_push_refspec(remote, xstrdup(s));
239 break;
240 case 2:
241 add_fetch_refspec(remote, xstrdup(s));
242 break;
245 fclose(f);
248 static void read_branches_file(struct remote *remote)
250 const char *slash = strchr(remote->name, '/');
251 char *frag;
252 struct strbuf branch = STRBUF_INIT;
253 int n = slash ? slash - remote->name : 1000;
254 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
255 char *s, *p;
256 int len;
258 if (!f)
259 return;
260 s = fgets(buffer, BUF_SIZE, f);
261 fclose(f);
262 if (!s)
263 return;
264 while (isspace(*s))
265 s++;
266 if (!*s)
267 return;
268 remote->origin = REMOTE_BRANCHES;
269 p = s + strlen(s);
270 while (isspace(p[-1]))
271 *--p = 0;
272 len = p - s;
273 if (slash)
274 len += strlen(slash);
275 p = xmalloc(len + 1);
276 strcpy(p, s);
277 if (slash)
278 strcat(p, slash);
281 * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
282 * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
283 * the partial URL obtained from the branches file plus
284 * "/netdev-2.6" and does not store it in any tracking ref.
285 * #branch specifier in the file is ignored.
287 * Otherwise, the branches file would have URL and optionally
288 * #branch specified. The "master" (or specified) branch is
289 * fetched and stored in the local branch of the same name.
291 frag = strchr(p, '#');
292 if (frag) {
293 *(frag++) = '\0';
294 strbuf_addf(&branch, "refs/heads/%s", frag);
295 } else
296 strbuf_addstr(&branch, "refs/heads/master");
297 if (!slash) {
298 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
299 } else {
300 strbuf_reset(&branch);
301 strbuf_addstr(&branch, "HEAD:");
303 add_url_alias(remote, p);
304 add_fetch_refspec(remote, strbuf_detach(&branch, 0));
306 * Cogito compatible push: push current HEAD to remote #branch
307 * (master if missing)
309 strbuf_init(&branch, 0);
310 strbuf_addstr(&branch, "HEAD");
311 if (frag)
312 strbuf_addf(&branch, ":refs/heads/%s", frag);
313 else
314 strbuf_addstr(&branch, ":refs/heads/master");
315 add_push_refspec(remote, strbuf_detach(&branch, 0));
316 remote->fetch_tags = 1; /* always auto-follow */
319 static int handle_config(const char *key, const char *value, void *cb)
321 const char *name;
322 const char *subkey;
323 struct remote *remote;
324 struct branch *branch;
325 if (!prefixcmp(key, "branch.")) {
326 name = key + 7;
327 subkey = strrchr(name, '.');
328 if (!subkey)
329 return 0;
330 branch = make_branch(name, subkey - name);
331 if (!strcmp(subkey, ".remote")) {
332 if (!value)
333 return config_error_nonbool(key);
334 branch->remote_name = xstrdup(value);
335 if (branch == current_branch) {
336 default_remote_name = branch->remote_name;
337 explicit_default_remote_name = 1;
339 } else if (!strcmp(subkey, ".merge")) {
340 if (!value)
341 return config_error_nonbool(key);
342 add_merge(branch, xstrdup(value));
344 return 0;
346 if (!prefixcmp(key, "url.")) {
347 struct rewrite *rewrite;
348 name = key + 4;
349 subkey = strrchr(name, '.');
350 if (!subkey)
351 return 0;
352 rewrite = make_rewrite(name, subkey - name);
353 if (!strcmp(subkey, ".insteadof")) {
354 if (!value)
355 return config_error_nonbool(key);
356 add_instead_of(rewrite, xstrdup(value));
359 if (prefixcmp(key, "remote."))
360 return 0;
361 name = key + 7;
362 if (*name == '/') {
363 warning("Config remote shorthand cannot begin with '/': %s",
364 name);
365 return 0;
367 subkey = strrchr(name, '.');
368 if (!subkey)
369 return error("Config with no key for remote %s", name);
370 remote = make_remote(name, subkey - name);
371 remote->origin = REMOTE_CONFIG;
372 if (!strcmp(subkey, ".mirror"))
373 remote->mirror = git_config_bool(key, value);
374 else if (!strcmp(subkey, ".skipdefaultupdate"))
375 remote->skip_default_update = git_config_bool(key, value);
377 else if (!strcmp(subkey, ".url")) {
378 const char *v;
379 if (git_config_string(&v, key, value))
380 return -1;
381 add_url(remote, v);
382 } else if (!strcmp(subkey, ".push")) {
383 const char *v;
384 if (git_config_string(&v, key, value))
385 return -1;
386 add_push_refspec(remote, v);
387 } else if (!strcmp(subkey, ".fetch")) {
388 const char *v;
389 if (git_config_string(&v, key, value))
390 return -1;
391 add_fetch_refspec(remote, v);
392 } else if (!strcmp(subkey, ".receivepack")) {
393 const char *v;
394 if (git_config_string(&v, key, value))
395 return -1;
396 if (!remote->receivepack)
397 remote->receivepack = v;
398 else
399 error("more than one receivepack given, using the first");
400 } else if (!strcmp(subkey, ".uploadpack")) {
401 const char *v;
402 if (git_config_string(&v, key, value))
403 return -1;
404 if (!remote->uploadpack)
405 remote->uploadpack = v;
406 else
407 error("more than one uploadpack given, using the first");
408 } else if (!strcmp(subkey, ".tagopt")) {
409 if (!strcmp(value, "--no-tags"))
410 remote->fetch_tags = -1;
411 } else if (!strcmp(subkey, ".proxy")) {
412 return git_config_string((const char **)&remote->http_proxy,
413 key, value);
415 return 0;
418 static void alias_all_urls(void)
420 int i, j;
421 for (i = 0; i < remotes_nr; i++) {
422 if (!remotes[i])
423 continue;
424 for (j = 0; j < remotes[i]->url_nr; j++) {
425 remotes[i]->url[j] = alias_url(remotes[i]->url[j]);
430 static void read_config(void)
432 unsigned char sha1[20];
433 const char *head_ref;
434 int flag;
435 if (default_remote_name) // did this already
436 return;
437 default_remote_name = xstrdup("origin");
438 current_branch = NULL;
439 head_ref = resolve_ref("HEAD", sha1, 0, &flag);
440 if (head_ref && (flag & REF_ISSYMREF) &&
441 !prefixcmp(head_ref, "refs/heads/")) {
442 current_branch =
443 make_branch(head_ref + strlen("refs/heads/"), 0);
445 git_config(handle_config, NULL);
446 alias_all_urls();
450 * We need to make sure the tracking branches are well formed, but a
451 * wildcard refspec in "struct refspec" must have a trailing slash. We
452 * temporarily drop the trailing '/' while calling check_ref_format(),
453 * and put it back. The caller knows that a CHECK_REF_FORMAT_ONELEVEL
454 * error return is Ok for a wildcard refspec.
456 static int verify_refname(char *name, int is_glob)
458 int result;
460 result = check_ref_format(name);
461 if (is_glob && result == CHECK_REF_FORMAT_WILDCARD)
462 result = CHECK_REF_FORMAT_OK;
463 return result;
467 * This function frees a refspec array.
468 * Warning: code paths should be checked to ensure that the src
469 * and dst pointers are always freeable pointers as well
470 * as the refspec pointer itself.
472 static void free_refspecs(struct refspec *refspec, int nr_refspec)
474 int i;
476 if (!refspec)
477 return;
479 for (i = 0; i < nr_refspec; i++) {
480 free(refspec[i].src);
481 free(refspec[i].dst);
483 free(refspec);
486 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
488 int i;
489 int st;
490 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
492 for (i = 0; i < nr_refspec; i++) {
493 size_t llen;
494 int is_glob;
495 const char *lhs, *rhs;
497 is_glob = 0;
499 lhs = refspec[i];
500 if (*lhs == '+') {
501 rs[i].force = 1;
502 lhs++;
505 rhs = strrchr(lhs, ':');
508 * Before going on, special case ":" (or "+:") as a refspec
509 * for matching refs.
511 if (!fetch && rhs == lhs && rhs[1] == '\0') {
512 rs[i].matching = 1;
513 continue;
516 if (rhs) {
517 size_t rlen = strlen(++rhs);
518 is_glob = (1 <= rlen && strchr(rhs, '*'));
519 rs[i].dst = xstrndup(rhs, rlen);
522 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
523 if (1 <= llen && memchr(lhs, '*', llen)) {
524 if ((rhs && !is_glob) || (!rhs && fetch))
525 goto invalid;
526 is_glob = 1;
527 } else if (rhs && is_glob) {
528 goto invalid;
531 rs[i].pattern = is_glob;
532 rs[i].src = xstrndup(lhs, llen);
534 if (fetch) {
536 * LHS
537 * - empty is allowed; it means HEAD.
538 * - otherwise it must be a valid looking ref.
540 if (!*rs[i].src)
541 ; /* empty is ok */
542 else {
543 st = verify_refname(rs[i].src, is_glob);
544 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
545 goto invalid;
548 * RHS
549 * - missing is ok, and is same as empty.
550 * - empty is ok; it means not to store.
551 * - otherwise it must be a valid looking ref.
553 if (!rs[i].dst) {
554 ; /* ok */
555 } else if (!*rs[i].dst) {
556 ; /* ok */
557 } else {
558 st = verify_refname(rs[i].dst, is_glob);
559 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
560 goto invalid;
562 } else {
564 * LHS
565 * - empty is allowed; it means delete.
566 * - when wildcarded, it must be a valid looking ref.
567 * - otherwise, it must be an extended SHA-1, but
568 * there is no existing way to validate this.
570 if (!*rs[i].src)
571 ; /* empty is ok */
572 else if (is_glob) {
573 st = verify_refname(rs[i].src, is_glob);
574 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
575 goto invalid;
577 else
578 ; /* anything goes, for now */
580 * RHS
581 * - missing is allowed, but LHS then must be a
582 * valid looking ref.
583 * - empty is not allowed.
584 * - otherwise it must be a valid looking ref.
586 if (!rs[i].dst) {
587 st = verify_refname(rs[i].src, is_glob);
588 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
589 goto invalid;
590 } else if (!*rs[i].dst) {
591 goto invalid;
592 } else {
593 st = verify_refname(rs[i].dst, is_glob);
594 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
595 goto invalid;
599 return rs;
601 invalid:
602 if (verify) {
604 * nr_refspec must be greater than zero and i must be valid
605 * since it is only possible to reach this point from within
606 * the for loop above.
608 free_refspecs(rs, i+1);
609 return NULL;
611 die("Invalid refspec '%s'", refspec[i]);
614 int valid_fetch_refspec(const char *fetch_refspec_str)
616 const char *fetch_refspec[] = { fetch_refspec_str };
617 struct refspec *refspec;
619 refspec = parse_refspec_internal(1, fetch_refspec, 1, 1);
620 free_refspecs(refspec, 1);
621 return !!refspec;
624 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
626 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
629 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
631 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
634 static int valid_remote_nick(const char *name)
636 if (!name[0] || is_dot_or_dotdot(name))
637 return 0;
638 return !strchr(name, '/'); /* no slash */
641 struct remote *remote_get(const char *name)
643 struct remote *ret;
644 int name_given = 0;
646 read_config();
647 if (name)
648 name_given = 1;
649 else {
650 name = default_remote_name;
651 name_given = explicit_default_remote_name;
654 ret = make_remote(name, 0);
655 if (valid_remote_nick(name)) {
656 if (!ret->url)
657 read_remotes_file(ret);
658 if (!ret->url)
659 read_branches_file(ret);
661 if (name_given && !ret->url)
662 add_url_alias(ret, name);
663 if (!ret->url)
664 return NULL;
665 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
666 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
667 return ret;
670 int for_each_remote(each_remote_fn fn, void *priv)
672 int i, result = 0;
673 read_config();
674 for (i = 0; i < remotes_nr && !result; i++) {
675 struct remote *r = remotes[i];
676 if (!r)
677 continue;
678 if (!r->fetch)
679 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
680 r->fetch_refspec);
681 if (!r->push)
682 r->push = parse_push_refspec(r->push_refspec_nr,
683 r->push_refspec);
684 result = fn(r, priv);
686 return result;
689 void ref_remove_duplicates(struct ref *ref_map)
691 struct ref **posn;
692 struct ref *next;
693 for (; ref_map; ref_map = ref_map->next) {
694 if (!ref_map->peer_ref)
695 continue;
696 posn = &ref_map->next;
697 while (*posn) {
698 if ((*posn)->peer_ref &&
699 !strcmp((*posn)->peer_ref->name,
700 ref_map->peer_ref->name)) {
701 if (strcmp((*posn)->name, ref_map->name))
702 die("%s tracks both %s and %s",
703 ref_map->peer_ref->name,
704 (*posn)->name, ref_map->name);
705 next = (*posn)->next;
706 free((*posn)->peer_ref);
707 free(*posn);
708 *posn = next;
709 } else {
710 posn = &(*posn)->next;
716 int remote_has_url(struct remote *remote, const char *url)
718 int i;
719 for (i = 0; i < remote->url_nr; i++) {
720 if (!strcmp(remote->url[i], url))
721 return 1;
723 return 0;
726 static int match_name_with_pattern(const char *key, const char *name,
727 const char *value, char **result)
729 const char *kstar = strchr(key, '*');
730 size_t klen;
731 size_t ksuffixlen;
732 size_t namelen;
733 int ret;
734 if (!kstar)
735 die("Key '%s' of pattern had no '*'", key);
736 klen = kstar - key;
737 ksuffixlen = strlen(kstar + 1);
738 namelen = strlen(name);
739 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
740 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
741 if (ret && value) {
742 const char *vstar = strchr(value, '*');
743 size_t vlen;
744 size_t vsuffixlen;
745 if (!vstar)
746 die("Value '%s' of pattern has no '*'", value);
747 vlen = vstar - value;
748 vsuffixlen = strlen(vstar + 1);
749 *result = xmalloc(vlen + vsuffixlen +
750 strlen(name) -
751 klen - ksuffixlen + 1);
752 strncpy(*result, value, vlen);
753 strncpy(*result + vlen,
754 name + klen, namelen - klen - ksuffixlen);
755 strcpy(*result + vlen + namelen - klen - ksuffixlen,
756 vstar + 1);
758 return ret;
761 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
763 int find_src = refspec->src == NULL;
764 char *needle, **result;
765 int i;
767 if (find_src) {
768 if (!refspec->dst)
769 return error("find_tracking: need either src or dst");
770 needle = refspec->dst;
771 result = &refspec->src;
772 } else {
773 needle = refspec->src;
774 result = &refspec->dst;
777 for (i = 0; i < remote->fetch_refspec_nr; i++) {
778 struct refspec *fetch = &remote->fetch[i];
779 const char *key = find_src ? fetch->dst : fetch->src;
780 const char *value = find_src ? fetch->src : fetch->dst;
781 if (!fetch->dst)
782 continue;
783 if (fetch->pattern) {
784 if (match_name_with_pattern(key, needle, value, result)) {
785 refspec->force = fetch->force;
786 return 0;
788 } else if (!strcmp(needle, key)) {
789 *result = xstrdup(value);
790 refspec->force = fetch->force;
791 return 0;
794 return -1;
797 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
798 const char *name)
800 size_t len = strlen(name);
801 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
802 memcpy(ref->name, prefix, prefixlen);
803 memcpy(ref->name + prefixlen, name, len);
804 return ref;
807 struct ref *alloc_ref(const char *name)
809 return alloc_ref_with_prefix("", 0, name);
812 static struct ref *copy_ref(const struct ref *ref)
814 struct ref *cpy;
815 size_t len;
816 if (!ref)
817 return NULL;
818 len = strlen(ref->name);
819 cpy = xmalloc(sizeof(struct ref) + len + 1);
820 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
821 cpy->next = NULL;
822 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
823 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
824 cpy->peer_ref = copy_ref(ref->peer_ref);
825 return cpy;
828 struct ref *copy_ref_list(const struct ref *ref)
830 struct ref *ret = NULL;
831 struct ref **tail = &ret;
832 while (ref) {
833 *tail = copy_ref(ref);
834 ref = ref->next;
835 tail = &((*tail)->next);
837 return ret;
840 static void free_ref(struct ref *ref)
842 if (!ref)
843 return;
844 free_ref(ref->peer_ref);
845 free(ref->remote_status);
846 free(ref->symref);
847 free(ref);
850 void free_refs(struct ref *ref)
852 struct ref *next;
853 while (ref) {
854 next = ref->next;
855 free_ref(ref);
856 ref = next;
860 static int count_refspec_match(const char *pattern,
861 struct ref *refs,
862 struct ref **matched_ref)
864 int patlen = strlen(pattern);
865 struct ref *matched_weak = NULL;
866 struct ref *matched = NULL;
867 int weak_match = 0;
868 int match = 0;
870 for (weak_match = match = 0; refs; refs = refs->next) {
871 char *name = refs->name;
872 int namelen = strlen(name);
874 if (!refname_match(pattern, name, ref_rev_parse_rules))
875 continue;
877 /* A match is "weak" if it is with refs outside
878 * heads or tags, and did not specify the pattern
879 * in full (e.g. "refs/remotes/origin/master") or at
880 * least from the toplevel (e.g. "remotes/origin/master");
881 * otherwise "git push $URL master" would result in
882 * ambiguity between remotes/origin/master and heads/master
883 * at the remote site.
885 if (namelen != patlen &&
886 patlen != namelen - 5 &&
887 prefixcmp(name, "refs/heads/") &&
888 prefixcmp(name, "refs/tags/")) {
889 /* We want to catch the case where only weak
890 * matches are found and there are multiple
891 * matches, and where more than one strong
892 * matches are found, as ambiguous. One
893 * strong match with zero or more weak matches
894 * are acceptable as a unique match.
896 matched_weak = refs;
897 weak_match++;
899 else {
900 matched = refs;
901 match++;
904 if (!matched) {
905 *matched_ref = matched_weak;
906 return weak_match;
908 else {
909 *matched_ref = matched;
910 return match;
914 static void tail_link_ref(struct ref *ref, struct ref ***tail)
916 **tail = ref;
917 while (ref->next)
918 ref = ref->next;
919 *tail = &ref->next;
922 static struct ref *try_explicit_object_name(const char *name)
924 unsigned char sha1[20];
925 struct ref *ref;
927 if (!*name) {
928 ref = alloc_ref("(delete)");
929 hashclr(ref->new_sha1);
930 return ref;
932 if (get_sha1(name, sha1))
933 return NULL;
934 ref = alloc_ref(name);
935 hashcpy(ref->new_sha1, sha1);
936 return ref;
939 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
941 struct ref *ret = alloc_ref(name);
942 tail_link_ref(ret, tail);
943 return ret;
946 static char *guess_ref(const char *name, struct ref *peer)
948 struct strbuf buf = STRBUF_INIT;
949 unsigned char sha1[20];
951 const char *r = resolve_ref(peer->name, sha1, 1, NULL);
952 if (!r)
953 return NULL;
955 if (!prefixcmp(r, "refs/heads/"))
956 strbuf_addstr(&buf, "refs/heads/");
957 else if (!prefixcmp(r, "refs/tags/"))
958 strbuf_addstr(&buf, "refs/tags/");
959 else
960 return NULL;
962 strbuf_addstr(&buf, name);
963 return strbuf_detach(&buf, NULL);
966 static int match_explicit(struct ref *src, struct ref *dst,
967 struct ref ***dst_tail,
968 struct refspec *rs)
970 struct ref *matched_src, *matched_dst;
971 int copy_src;
973 const char *dst_value = rs->dst;
974 char *dst_guess;
976 if (rs->pattern || rs->matching)
977 return 0;
979 matched_src = matched_dst = NULL;
980 switch (count_refspec_match(rs->src, src, &matched_src)) {
981 case 1:
982 copy_src = 1;
983 break;
984 case 0:
985 /* The source could be in the get_sha1() format
986 * not a reference name. :refs/other is a
987 * way to delete 'other' ref at the remote end.
989 matched_src = try_explicit_object_name(rs->src);
990 if (!matched_src)
991 return error("src refspec %s does not match any.", rs->src);
992 copy_src = 0;
993 break;
994 default:
995 return error("src refspec %s matches more than one.", rs->src);
998 if (!dst_value) {
999 unsigned char sha1[20];
1000 int flag;
1002 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
1003 if (!dst_value ||
1004 ((flag & REF_ISSYMREF) &&
1005 prefixcmp(dst_value, "refs/heads/")))
1006 die("%s cannot be resolved to branch.",
1007 matched_src->name);
1010 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1011 case 1:
1012 break;
1013 case 0:
1014 if (!memcmp(dst_value, "refs/", 5))
1015 matched_dst = make_linked_ref(dst_value, dst_tail);
1016 else if((dst_guess = guess_ref(dst_value, matched_src)))
1017 matched_dst = make_linked_ref(dst_guess, dst_tail);
1018 else
1019 error("unable to push to unqualified destination: %s\n"
1020 "The destination refspec neither matches an "
1021 "existing ref on the remote nor\n"
1022 "begins with refs/, and we are unable to "
1023 "guess a prefix based on the source ref.",
1024 dst_value);
1025 break;
1026 default:
1027 matched_dst = NULL;
1028 error("dst refspec %s matches more than one.",
1029 dst_value);
1030 break;
1032 if (!matched_dst)
1033 return -1;
1034 if (matched_dst->peer_ref)
1035 return error("dst ref %s receives from more than one src.",
1036 matched_dst->name);
1037 else {
1038 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1039 matched_dst->force = rs->force;
1041 return 0;
1044 static int match_explicit_refs(struct ref *src, struct ref *dst,
1045 struct ref ***dst_tail, struct refspec *rs,
1046 int rs_nr)
1048 int i, errs;
1049 for (i = errs = 0; i < rs_nr; i++)
1050 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1051 return errs;
1054 static const struct refspec *check_pattern_match(const struct refspec *rs,
1055 int rs_nr,
1056 const struct ref *src)
1058 int i;
1059 int matching_refs = -1;
1060 for (i = 0; i < rs_nr; i++) {
1061 if (rs[i].matching &&
1062 (matching_refs == -1 || rs[i].force)) {
1063 matching_refs = i;
1064 continue;
1067 if (rs[i].pattern && match_name_with_pattern(rs[i].src, src->name,
1068 NULL, NULL))
1069 return rs + i;
1071 if (matching_refs != -1)
1072 return rs + matching_refs;
1073 else
1074 return NULL;
1078 * Note. This is used only by "push"; refspec matching rules for
1079 * push and fetch are subtly different, so do not try to reuse it
1080 * without thinking.
1082 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
1083 int nr_refspec, const char **refspec, int flags)
1085 struct refspec *rs;
1086 int send_all = flags & MATCH_REFS_ALL;
1087 int send_mirror = flags & MATCH_REFS_MIRROR;
1088 int errs;
1089 static const char *default_refspec[] = { ":", 0 };
1091 if (!nr_refspec) {
1092 nr_refspec = 1;
1093 refspec = default_refspec;
1095 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1096 errs = match_explicit_refs(src, dst, dst_tail, rs, nr_refspec);
1098 /* pick the remainder */
1099 for ( ; src; src = src->next) {
1100 struct ref *dst_peer;
1101 const struct refspec *pat = NULL;
1102 char *dst_name;
1103 if (src->peer_ref)
1104 continue;
1106 pat = check_pattern_match(rs, nr_refspec, src);
1107 if (!pat)
1108 continue;
1110 if (pat->matching) {
1112 * "matching refs"; traditionally we pushed everything
1113 * including refs outside refs/heads/ hierarchy, but
1114 * that does not make much sense these days.
1116 if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
1117 continue;
1118 dst_name = xstrdup(src->name);
1120 } else {
1121 const char *dst_side = pat->dst ? pat->dst : pat->src;
1122 if (!match_name_with_pattern(pat->src, src->name,
1123 dst_side, &dst_name))
1124 die("Didn't think it matches any more");
1126 dst_peer = find_ref_by_name(dst, dst_name);
1127 if (dst_peer) {
1128 if (dst_peer->peer_ref)
1129 /* We're already sending something to this ref. */
1130 goto free_name;
1132 } else {
1133 if (pat->matching && !(send_all || send_mirror))
1135 * Remote doesn't have it, and we have no
1136 * explicit pattern, and we don't have
1137 * --all nor --mirror.
1139 goto free_name;
1141 /* Create a new one and link it */
1142 dst_peer = make_linked_ref(dst_name, dst_tail);
1143 hashcpy(dst_peer->new_sha1, src->new_sha1);
1145 dst_peer->peer_ref = copy_ref(src);
1146 dst_peer->force = pat->force;
1147 free_name:
1148 free(dst_name);
1150 if (errs)
1151 return -1;
1152 return 0;
1155 struct branch *branch_get(const char *name)
1157 struct branch *ret;
1159 read_config();
1160 if (!name || !*name || !strcmp(name, "HEAD"))
1161 ret = current_branch;
1162 else
1163 ret = make_branch(name, 0);
1164 if (ret && ret->remote_name) {
1165 ret->remote = remote_get(ret->remote_name);
1166 if (ret->merge_nr) {
1167 int i;
1168 ret->merge = xcalloc(sizeof(*ret->merge),
1169 ret->merge_nr);
1170 for (i = 0; i < ret->merge_nr; i++) {
1171 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1172 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1173 remote_find_tracking(ret->remote,
1174 ret->merge[i]);
1178 return ret;
1181 int branch_has_merge_config(struct branch *branch)
1183 return branch && !!branch->merge;
1186 int branch_merge_matches(struct branch *branch,
1187 int i,
1188 const char *refname)
1190 if (!branch || i < 0 || i >= branch->merge_nr)
1191 return 0;
1192 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1195 static struct ref *get_expanded_map(const struct ref *remote_refs,
1196 const struct refspec *refspec)
1198 const struct ref *ref;
1199 struct ref *ret = NULL;
1200 struct ref **tail = &ret;
1202 char *expn_name;
1204 for (ref = remote_refs; ref; ref = ref->next) {
1205 if (strchr(ref->name, '^'))
1206 continue; /* a dereference item */
1207 if (match_name_with_pattern(refspec->src, ref->name,
1208 refspec->dst, &expn_name)) {
1209 struct ref *cpy = copy_ref(ref);
1211 cpy->peer_ref = alloc_ref(expn_name);
1212 free(expn_name);
1213 if (refspec->force)
1214 cpy->peer_ref->force = 1;
1215 *tail = cpy;
1216 tail = &cpy->next;
1220 return ret;
1223 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1225 const struct ref *ref;
1226 for (ref = refs; ref; ref = ref->next) {
1227 if (refname_match(name, ref->name, ref_fetch_rules))
1228 return ref;
1230 return NULL;
1233 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1235 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1237 if (!ref)
1238 return NULL;
1240 return copy_ref(ref);
1243 static struct ref *get_local_ref(const char *name)
1245 if (!name)
1246 return NULL;
1248 if (!prefixcmp(name, "refs/"))
1249 return alloc_ref(name);
1251 if (!prefixcmp(name, "heads/") ||
1252 !prefixcmp(name, "tags/") ||
1253 !prefixcmp(name, "remotes/"))
1254 return alloc_ref_with_prefix("refs/", 5, name);
1256 return alloc_ref_with_prefix("refs/heads/", 11, name);
1259 int get_fetch_map(const struct ref *remote_refs,
1260 const struct refspec *refspec,
1261 struct ref ***tail,
1262 int missing_ok)
1264 struct ref *ref_map, **rmp;
1266 if (refspec->pattern) {
1267 ref_map = get_expanded_map(remote_refs, refspec);
1268 } else {
1269 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1271 ref_map = get_remote_ref(remote_refs, name);
1272 if (!missing_ok && !ref_map)
1273 die("Couldn't find remote ref %s", name);
1274 if (ref_map) {
1275 ref_map->peer_ref = get_local_ref(refspec->dst);
1276 if (ref_map->peer_ref && refspec->force)
1277 ref_map->peer_ref->force = 1;
1281 for (rmp = &ref_map; *rmp; ) {
1282 if ((*rmp)->peer_ref) {
1283 int st = check_ref_format((*rmp)->peer_ref->name + 5);
1284 if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
1285 struct ref *ignore = *rmp;
1286 error("* Ignoring funny ref '%s' locally",
1287 (*rmp)->peer_ref->name);
1288 *rmp = (*rmp)->next;
1289 free(ignore->peer_ref);
1290 free(ignore);
1291 continue;
1294 rmp = &((*rmp)->next);
1297 if (ref_map)
1298 tail_link_ref(ref_map, tail);
1300 return 0;
1303 int resolve_remote_symref(struct ref *ref, struct ref *list)
1305 if (!ref->symref)
1306 return 0;
1307 for (; list; list = list->next)
1308 if (!strcmp(ref->symref, list->name)) {
1309 hashcpy(ref->old_sha1, list->old_sha1);
1310 return 0;
1312 return 1;
1315 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1317 while (list) {
1318 struct commit_list *temp = list;
1319 temp->item->object.flags &= ~mark;
1320 list = temp->next;
1321 free(temp);
1325 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1327 struct object *o;
1328 struct commit *old, *new;
1329 struct commit_list *list, *used;
1330 int found = 0;
1332 /* Both new and old must be commit-ish and new is descendant of
1333 * old. Otherwise we require --force.
1335 o = deref_tag(parse_object(old_sha1), NULL, 0);
1336 if (!o || o->type != OBJ_COMMIT)
1337 return 0;
1338 old = (struct commit *) o;
1340 o = deref_tag(parse_object(new_sha1), NULL, 0);
1341 if (!o || o->type != OBJ_COMMIT)
1342 return 0;
1343 new = (struct commit *) o;
1345 if (parse_commit(new) < 0)
1346 return 0;
1348 used = list = NULL;
1349 commit_list_insert(new, &list);
1350 while (list) {
1351 new = pop_most_recent_commit(&list, TMP_MARK);
1352 commit_list_insert(new, &used);
1353 if (new == old) {
1354 found = 1;
1355 break;
1358 unmark_and_free(list, TMP_MARK);
1359 unmark_and_free(used, TMP_MARK);
1360 return found;
1364 * Return true if there is anything to report, otherwise false.
1366 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1368 unsigned char sha1[20];
1369 struct commit *ours, *theirs;
1370 char symmetric[84];
1371 struct rev_info revs;
1372 const char *rev_argv[10], *base;
1373 int rev_argc;
1376 * Nothing to report unless we are marked to build on top of
1377 * somebody else.
1379 if (!branch ||
1380 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1381 return 0;
1384 * If what we used to build on no longer exists, there is
1385 * nothing to report.
1387 base = branch->merge[0]->dst;
1388 if (!resolve_ref(base, sha1, 1, NULL))
1389 return 0;
1390 theirs = lookup_commit(sha1);
1391 if (!theirs)
1392 return 0;
1394 if (!resolve_ref(branch->refname, sha1, 1, NULL))
1395 return 0;
1396 ours = lookup_commit(sha1);
1397 if (!ours)
1398 return 0;
1400 /* are we the same? */
1401 if (theirs == ours)
1402 return 0;
1404 /* Run "rev-list --left-right ours...theirs" internally... */
1405 rev_argc = 0;
1406 rev_argv[rev_argc++] = NULL;
1407 rev_argv[rev_argc++] = "--left-right";
1408 rev_argv[rev_argc++] = symmetric;
1409 rev_argv[rev_argc++] = "--";
1410 rev_argv[rev_argc] = NULL;
1412 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1413 strcpy(symmetric + 40, "...");
1414 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1416 init_revisions(&revs, NULL);
1417 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1418 prepare_revision_walk(&revs);
1420 /* ... and count the commits on each side. */
1421 *num_ours = 0;
1422 *num_theirs = 0;
1423 while (1) {
1424 struct commit *c = get_revision(&revs);
1425 if (!c)
1426 break;
1427 if (c->object.flags & SYMMETRIC_LEFT)
1428 (*num_ours)++;
1429 else
1430 (*num_theirs)++;
1433 /* clear object flags smudged by the above traversal */
1434 clear_commit_marks(ours, ALL_REV_FLAGS);
1435 clear_commit_marks(theirs, ALL_REV_FLAGS);
1436 return 1;
1440 * Return true when there is anything to report, otherwise false.
1442 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1444 int num_ours, num_theirs;
1445 const char *base;
1447 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1448 return 0;
1450 base = branch->merge[0]->dst;
1451 if (!prefixcmp(base, "refs/remotes/")) {
1452 base += strlen("refs/remotes/");
1454 if (!num_theirs)
1455 strbuf_addf(sb, "Your branch is ahead of '%s' "
1456 "by %d commit%s.\n",
1457 base, num_ours, (num_ours == 1) ? "" : "s");
1458 else if (!num_ours)
1459 strbuf_addf(sb, "Your branch is behind '%s' "
1460 "by %d commit%s, "
1461 "and can be fast-forwarded.\n",
1462 base, num_theirs, (num_theirs == 1) ? "" : "s");
1463 else
1464 strbuf_addf(sb, "Your branch and '%s' have diverged,\n"
1465 "and have %d and %d different commit(s) each, "
1466 "respectively.\n",
1467 base, num_ours, num_theirs);
1468 return 1;
1471 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1473 struct ref ***local_tail = cb_data;
1474 struct ref *ref;
1475 int len;
1477 /* we already know it starts with refs/ to get here */
1478 if (check_ref_format(refname + 5))
1479 return 0;
1481 len = strlen(refname) + 1;
1482 ref = xcalloc(1, sizeof(*ref) + len);
1483 hashcpy(ref->new_sha1, sha1);
1484 memcpy(ref->name, refname, len);
1485 **local_tail = ref;
1486 *local_tail = &ref->next;
1487 return 0;
1490 struct ref *get_local_heads(void)
1492 struct ref *local_refs, **local_tail = &local_refs;
1493 for_each_ref(one_local_ref, &local_tail);
1494 return local_refs;
1497 struct ref *guess_remote_head(const struct ref *head,
1498 const struct ref *refs,
1499 int all)
1501 const struct ref *r;
1502 struct ref *list = NULL;
1503 struct ref **tail = &list;
1505 if (!head)
1506 return NULL;
1509 * Some transports support directly peeking at
1510 * where HEAD points; if that is the case, then
1511 * we don't have to guess.
1513 if (head->symref)
1514 return copy_ref(find_ref_by_name(refs, head->symref));
1516 /* If refs/heads/master could be right, it is. */
1517 if (!all) {
1518 r = find_ref_by_name(refs, "refs/heads/master");
1519 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1520 return copy_ref(r);
1523 /* Look for another ref that points there */
1524 for (r = refs; r; r = r->next) {
1525 if (r != head && !hashcmp(r->old_sha1, head->old_sha1)) {
1526 *tail = copy_ref(r);
1527 tail = &((*tail)->next);
1528 if (!all)
1529 break;
1533 return list;