git-remote: reject adding remotes with invalid names
[git/git.git] / remote.c
1 #include "cache.h"
2 #include "remote.h"
3 #include "refs.h"
4
5 struct counted_string {
6 size_t len;
7 const char *s;
8 };
9 struct rewrite {
10 const char *base;
11 size_t baselen;
12 struct counted_string *instead_of;
13 int instead_of_nr;
14 int instead_of_alloc;
15 };
16
17 static struct remote **remotes;
18 static int remotes_alloc;
19 static int remotes_nr;
20
21 static struct branch **branches;
22 static int branches_alloc;
23 static int branches_nr;
24
25 static struct branch *current_branch;
26 static const char *default_remote_name;
27
28 static struct rewrite **rewrite;
29 static int rewrite_alloc;
30 static int rewrite_nr;
31
32 #define BUF_SIZE (2048)
33 static char buffer[BUF_SIZE];
34
35 static const char *alias_url(const char *url)
36 {
37 int i, j;
38 char *ret;
39 struct counted_string *longest;
40 int longest_i;
41
42 longest = NULL;
43 longest_i = -1;
44 for (i = 0; i < rewrite_nr; i++) {
45 if (!rewrite[i])
46 continue;
47 for (j = 0; j < rewrite[i]->instead_of_nr; j++) {
48 if (!prefixcmp(url, rewrite[i]->instead_of[j].s) &&
49 (!longest ||
50 longest->len < rewrite[i]->instead_of[j].len)) {
51 longest = &(rewrite[i]->instead_of[j]);
52 longest_i = i;
53 }
54 }
55 }
56 if (!longest)
57 return url;
58
59 ret = malloc(rewrite[longest_i]->baselen +
60 (strlen(url) - longest->len) + 1);
61 strcpy(ret, rewrite[longest_i]->base);
62 strcpy(ret + rewrite[longest_i]->baselen, url + longest->len);
63 return ret;
64 }
65
66 static void add_push_refspec(struct remote *remote, const char *ref)
67 {
68 ALLOC_GROW(remote->push_refspec,
69 remote->push_refspec_nr + 1,
70 remote->push_refspec_alloc);
71 remote->push_refspec[remote->push_refspec_nr++] = ref;
72 }
73
74 static void add_fetch_refspec(struct remote *remote, const char *ref)
75 {
76 ALLOC_GROW(remote->fetch_refspec,
77 remote->fetch_refspec_nr + 1,
78 remote->fetch_refspec_alloc);
79 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
80 }
81
82 static void add_url(struct remote *remote, const char *url)
83 {
84 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
85 remote->url[remote->url_nr++] = url;
86 }
87
88 static void add_url_alias(struct remote *remote, const char *url)
89 {
90 add_url(remote, alias_url(url));
91 }
92
93 static struct remote *make_remote(const char *name, int len)
94 {
95 struct remote *ret;
96 int i;
97
98 for (i = 0; i < remotes_nr; i++) {
99 if (len ? (!strncmp(name, remotes[i]->name, len) &&
100 !remotes[i]->name[len]) :
101 !strcmp(name, remotes[i]->name))
102 return remotes[i];
103 }
104
105 ret = xcalloc(1, sizeof(struct remote));
106 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
107 remotes[remotes_nr++] = ret;
108 if (len)
109 ret->name = xstrndup(name, len);
110 else
111 ret->name = xstrdup(name);
112 return ret;
113 }
114
115 static void add_merge(struct branch *branch, const char *name)
116 {
117 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
118 branch->merge_alloc);
119 branch->merge_name[branch->merge_nr++] = name;
120 }
121
122 static struct branch *make_branch(const char *name, int len)
123 {
124 struct branch *ret;
125 int i;
126 char *refname;
127
128 for (i = 0; i < branches_nr; i++) {
129 if (len ? (!strncmp(name, branches[i]->name, len) &&
130 !branches[i]->name[len]) :
131 !strcmp(name, branches[i]->name))
132 return branches[i];
133 }
134
135 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
136 ret = xcalloc(1, sizeof(struct branch));
137 branches[branches_nr++] = ret;
138 if (len)
139 ret->name = xstrndup(name, len);
140 else
141 ret->name = xstrdup(name);
142 refname = malloc(strlen(name) + strlen("refs/heads/") + 1);
143 strcpy(refname, "refs/heads/");
144 strcpy(refname + strlen("refs/heads/"), ret->name);
145 ret->refname = refname;
146
147 return ret;
148 }
149
150 static struct rewrite *make_rewrite(const char *base, int len)
151 {
152 struct rewrite *ret;
153 int i;
154
155 for (i = 0; i < rewrite_nr; i++) {
156 if (len
157 ? (len == rewrite[i]->baselen &&
158 !strncmp(base, rewrite[i]->base, len))
159 : !strcmp(base, rewrite[i]->base))
160 return rewrite[i];
161 }
162
163 ALLOC_GROW(rewrite, rewrite_nr + 1, rewrite_alloc);
164 ret = xcalloc(1, sizeof(struct rewrite));
165 rewrite[rewrite_nr++] = ret;
166 if (len) {
167 ret->base = xstrndup(base, len);
168 ret->baselen = len;
169 }
170 else {
171 ret->base = xstrdup(base);
172 ret->baselen = strlen(base);
173 }
174 return ret;
175 }
176
177 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
178 {
179 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
180 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
181 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
182 rewrite->instead_of_nr++;
183 }
184
185 static void read_remotes_file(struct remote *remote)
186 {
187 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
188
189 if (!f)
190 return;
191 while (fgets(buffer, BUF_SIZE, f)) {
192 int value_list;
193 char *s, *p;
194
195 if (!prefixcmp(buffer, "URL:")) {
196 value_list = 0;
197 s = buffer + 4;
198 } else if (!prefixcmp(buffer, "Push:")) {
199 value_list = 1;
200 s = buffer + 5;
201 } else if (!prefixcmp(buffer, "Pull:")) {
202 value_list = 2;
203 s = buffer + 5;
204 } else
205 continue;
206
207 while (isspace(*s))
208 s++;
209 if (!*s)
210 continue;
211
212 p = s + strlen(s);
213 while (isspace(p[-1]))
214 *--p = 0;
215
216 switch (value_list) {
217 case 0:
218 add_url_alias(remote, xstrdup(s));
219 break;
220 case 1:
221 add_push_refspec(remote, xstrdup(s));
222 break;
223 case 2:
224 add_fetch_refspec(remote, xstrdup(s));
225 break;
226 }
227 }
228 fclose(f);
229 }
230
231 static void read_branches_file(struct remote *remote)
232 {
233 const char *slash = strchr(remote->name, '/');
234 char *frag;
235 struct strbuf branch;
236 int n = slash ? slash - remote->name : 1000;
237 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
238 char *s, *p;
239 int len;
240
241 if (!f)
242 return;
243 s = fgets(buffer, BUF_SIZE, f);
244 fclose(f);
245 if (!s)
246 return;
247 while (isspace(*s))
248 s++;
249 if (!*s)
250 return;
251 p = s + strlen(s);
252 while (isspace(p[-1]))
253 *--p = 0;
254 len = p - s;
255 if (slash)
256 len += strlen(slash);
257 p = xmalloc(len + 1);
258 strcpy(p, s);
259 if (slash)
260 strcat(p, slash);
261
262 /*
263 * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
264 * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
265 * the partial URL obtained from the branches file plus
266 * "/netdev-2.6" and does not store it in any tracking ref.
267 * #branch specifier in the file is ignored.
268 *
269 * Otherwise, the branches file would have URL and optionally
270 * #branch specified. The "master" (or specified) branch is
271 * fetched and stored in the local branch of the same name.
272 */
273 strbuf_init(&branch, 0);
274 frag = strchr(p, '#');
275 if (frag) {
276 *(frag++) = '\0';
277 strbuf_addf(&branch, "refs/heads/%s", frag);
278 } else
279 strbuf_addstr(&branch, "refs/heads/master");
280 if (!slash) {
281 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
282 } else {
283 strbuf_reset(&branch);
284 strbuf_addstr(&branch, "HEAD:");
285 }
286 add_url_alias(remote, p);
287 add_fetch_refspec(remote, strbuf_detach(&branch, 0));
288 remote->fetch_tags = 1; /* always auto-follow */
289 }
290
291 static int handle_config(const char *key, const char *value)
292 {
293 const char *name;
294 const char *subkey;
295 struct remote *remote;
296 struct branch *branch;
297 if (!prefixcmp(key, "branch.")) {
298 name = key + 7;
299 subkey = strrchr(name, '.');
300 if (!subkey)
301 return 0;
302 branch = make_branch(name, subkey - name);
303 if (!strcmp(subkey, ".remote")) {
304 if (!value)
305 return config_error_nonbool(key);
306 branch->remote_name = xstrdup(value);
307 if (branch == current_branch)
308 default_remote_name = branch->remote_name;
309 } else if (!strcmp(subkey, ".merge")) {
310 if (!value)
311 return config_error_nonbool(key);
312 add_merge(branch, xstrdup(value));
313 }
314 return 0;
315 }
316 if (!prefixcmp(key, "url.")) {
317 struct rewrite *rewrite;
318 name = key + 4;
319 subkey = strrchr(name, '.');
320 if (!subkey)
321 return 0;
322 rewrite = make_rewrite(name, subkey - name);
323 if (!strcmp(subkey, ".insteadof")) {
324 if (!value)
325 return config_error_nonbool(key);
326 add_instead_of(rewrite, xstrdup(value));
327 }
328 }
329 if (prefixcmp(key, "remote."))
330 return 0;
331 name = key + 7;
332 subkey = strrchr(name, '.');
333 if (!subkey)
334 return error("Config with no key for remote %s", name);
335 if (*subkey == '/') {
336 warning("Config remote shorthand cannot begin with '/': %s", name);
337 return 0;
338 }
339 remote = make_remote(name, subkey - name);
340 if (!value) {
341 /* if we ever have a boolean variable, e.g. "remote.*.disabled"
342 * [remote "frotz"]
343 * disabled
344 * is a valid way to set it to true; we get NULL in value so
345 * we need to handle it here.
346 *
347 * if (!strcmp(subkey, ".disabled")) {
348 * val = git_config_bool(key, value);
349 * return 0;
350 * } else
351 *
352 */
353 return 0; /* ignore unknown booleans */
354 }
355 if (!strcmp(subkey, ".url")) {
356 add_url(remote, xstrdup(value));
357 } else if (!strcmp(subkey, ".push")) {
358 add_push_refspec(remote, xstrdup(value));
359 } else if (!strcmp(subkey, ".fetch")) {
360 add_fetch_refspec(remote, xstrdup(value));
361 } else if (!strcmp(subkey, ".receivepack")) {
362 if (!remote->receivepack)
363 remote->receivepack = xstrdup(value);
364 else
365 error("more than one receivepack given, using the first");
366 } else if (!strcmp(subkey, ".uploadpack")) {
367 if (!remote->uploadpack)
368 remote->uploadpack = xstrdup(value);
369 else
370 error("more than one uploadpack given, using the first");
371 } else if (!strcmp(subkey, ".tagopt")) {
372 if (!strcmp(value, "--no-tags"))
373 remote->fetch_tags = -1;
374 } else if (!strcmp(subkey, ".proxy")) {
375 remote->http_proxy = xstrdup(value);
376 } else if (!strcmp(subkey, ".skipdefaultupdate"))
377 remote->skip_default_update = 1;
378 return 0;
379 }
380
381 static void alias_all_urls(void)
382 {
383 int i, j;
384 for (i = 0; i < remotes_nr; i++) {
385 if (!remotes[i])
386 continue;
387 for (j = 0; j < remotes[i]->url_nr; j++) {
388 remotes[i]->url[j] = alias_url(remotes[i]->url[j]);
389 }
390 }
391 }
392
393 static void read_config(void)
394 {
395 unsigned char sha1[20];
396 const char *head_ref;
397 int flag;
398 if (default_remote_name) // did this already
399 return;
400 default_remote_name = xstrdup("origin");
401 current_branch = NULL;
402 head_ref = resolve_ref("HEAD", sha1, 0, &flag);
403 if (head_ref && (flag & REF_ISSYMREF) &&
404 !prefixcmp(head_ref, "refs/heads/")) {
405 current_branch =
406 make_branch(head_ref + strlen("refs/heads/"), 0);
407 }
408 git_config(handle_config);
409 alias_all_urls();
410 }
411
412 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
413 {
414 int i;
415 int st;
416 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
417
418 for (i = 0; i < nr_refspec; i++) {
419 size_t llen, rlen;
420 int is_glob;
421 const char *lhs, *rhs;
422
423 llen = rlen = is_glob = 0;
424
425 lhs = refspec[i];
426 if (*lhs == '+') {
427 rs[i].force = 1;
428 lhs++;
429 }
430
431 rhs = strrchr(lhs, ':');
432 if (rhs) {
433 rhs++;
434 rlen = strlen(rhs);
435 is_glob = (2 <= rlen && !strcmp(rhs + rlen - 2, "/*"));
436 if (is_glob)
437 rlen -= 2;
438 rs[i].dst = xstrndup(rhs, rlen);
439 }
440
441 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
442 if (2 <= llen && !memcmp(lhs + llen - 2, "/*", 2)) {
443 if ((rhs && !is_glob) || (!rhs && fetch))
444 goto invalid;
445 is_glob = 1;
446 llen -= 2;
447 } else if (rhs && is_glob) {
448 goto invalid;
449 }
450
451 rs[i].pattern = is_glob;
452 rs[i].src = xstrndup(lhs, llen);
453
454 if (fetch) {
455 /*
456 * LHS
457 * - empty is allowed; it means HEAD.
458 * - otherwise it must be a valid looking ref.
459 */
460 if (!*rs[i].src)
461 ; /* empty is ok */
462 else {
463 st = check_ref_format(rs[i].src);
464 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
465 goto invalid;
466 }
467 /*
468 * RHS
469 * - missing is ok, and is same as empty.
470 * - empty is ok; it means not to store.
471 * - otherwise it must be a valid looking ref.
472 */
473 if (!rs[i].dst) {
474 ; /* ok */
475 } else if (!*rs[i].dst) {
476 ; /* ok */
477 } else {
478 st = check_ref_format(rs[i].dst);
479 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
480 goto invalid;
481 }
482 } else {
483 /*
484 * LHS
485 * - empty is allowed; it means delete.
486 * - when wildcarded, it must be a valid looking ref.
487 * - otherwise, it must be an extended SHA-1, but
488 * there is no existing way to validate this.
489 */
490 if (!*rs[i].src)
491 ; /* empty is ok */
492 else if (is_glob) {
493 st = check_ref_format(rs[i].src);
494 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
495 goto invalid;
496 }
497 else
498 ; /* anything goes, for now */
499 /*
500 * RHS
501 * - missing is allowed, but LHS then must be a
502 * valid looking ref.
503 * - empty is not allowed.
504 * - otherwise it must be a valid looking ref.
505 */
506 if (!rs[i].dst) {
507 st = check_ref_format(rs[i].src);
508 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
509 goto invalid;
510 } else if (!*rs[i].dst) {
511 goto invalid;
512 } else {
513 st = check_ref_format(rs[i].dst);
514 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
515 goto invalid;
516 }
517 }
518 }
519 return rs;
520
521 invalid:
522 if (verify) {
523 free(rs);
524 return NULL;
525 }
526 die("Invalid refspec '%s'", refspec[i]);
527 }
528
529 int valid_fetch_refspec(const char *fetch_refspec_str)
530 {
531 const char *fetch_refspec[] = { fetch_refspec_str };
532 struct refspec *refspec;
533
534 refspec = parse_refspec_internal(1, fetch_refspec, 1, 1);
535 if (refspec)
536 free(refspec);
537 return !!refspec;
538 }
539
540 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
541 {
542 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
543 }
544
545 struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
546 {
547 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
548 }
549
550 static int valid_remote_nick(const char *name)
551 {
552 if (!name[0] || /* not empty */
553 (name[0] == '.' && /* not "." */
554 (!name[1] || /* not ".." */
555 (name[1] == '.' && !name[2]))))
556 return 0;
557 return !strchr(name, '/'); /* no slash */
558 }
559
560 struct remote *remote_get(const char *name)
561 {
562 struct remote *ret;
563
564 read_config();
565 if (!name)
566 name = default_remote_name;
567 ret = make_remote(name, 0);
568 if (valid_remote_nick(name)) {
569 if (!ret->url)
570 read_remotes_file(ret);
571 if (!ret->url)
572 read_branches_file(ret);
573 }
574 if (!ret->url)
575 add_url_alias(ret, name);
576 if (!ret->url)
577 return NULL;
578 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
579 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
580 return ret;
581 }
582
583 int for_each_remote(each_remote_fn fn, void *priv)
584 {
585 int i, result = 0;
586 read_config();
587 for (i = 0; i < remotes_nr && !result; i++) {
588 struct remote *r = remotes[i];
589 if (!r)
590 continue;
591 if (!r->fetch)
592 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
593 r->fetch_refspec);
594 if (!r->push)
595 r->push = parse_push_refspec(r->push_refspec_nr,
596 r->push_refspec);
597 result = fn(r, priv);
598 }
599 return result;
600 }
601
602 void ref_remove_duplicates(struct ref *ref_map)
603 {
604 struct ref **posn;
605 struct ref *next;
606 for (; ref_map; ref_map = ref_map->next) {
607 if (!ref_map->peer_ref)
608 continue;
609 posn = &ref_map->next;
610 while (*posn) {
611 if ((*posn)->peer_ref &&
612 !strcmp((*posn)->peer_ref->name,
613 ref_map->peer_ref->name)) {
614 if (strcmp((*posn)->name, ref_map->name))
615 die("%s tracks both %s and %s",
616 ref_map->peer_ref->name,
617 (*posn)->name, ref_map->name);
618 next = (*posn)->next;
619 free((*posn)->peer_ref);
620 free(*posn);
621 *posn = next;
622 } else {
623 posn = &(*posn)->next;
624 }
625 }
626 }
627 }
628
629 int remote_has_url(struct remote *remote, const char *url)
630 {
631 int i;
632 for (i = 0; i < remote->url_nr; i++) {
633 if (!strcmp(remote->url[i], url))
634 return 1;
635 }
636 return 0;
637 }
638
639 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
640 {
641 int find_src = refspec->src == NULL;
642 char *needle, **result;
643 int i;
644
645 if (find_src) {
646 if (!refspec->dst)
647 return error("find_tracking: need either src or dst");
648 needle = refspec->dst;
649 result = &refspec->src;
650 } else {
651 needle = refspec->src;
652 result = &refspec->dst;
653 }
654
655 for (i = 0; i < remote->fetch_refspec_nr; i++) {
656 struct refspec *fetch = &remote->fetch[i];
657 const char *key = find_src ? fetch->dst : fetch->src;
658 const char *value = find_src ? fetch->src : fetch->dst;
659 if (!fetch->dst)
660 continue;
661 if (fetch->pattern) {
662 if (!prefixcmp(needle, key) &&
663 needle[strlen(key)] == '/') {
664 *result = xmalloc(strlen(value) +
665 strlen(needle) -
666 strlen(key) + 1);
667 strcpy(*result, value);
668 strcpy(*result + strlen(value),
669 needle + strlen(key));
670 refspec->force = fetch->force;
671 return 0;
672 }
673 } else if (!strcmp(needle, key)) {
674 *result = xstrdup(value);
675 refspec->force = fetch->force;
676 return 0;
677 }
678 }
679 return -1;
680 }
681
682 struct ref *alloc_ref(unsigned namelen)
683 {
684 struct ref *ret = xmalloc(sizeof(struct ref) + namelen);
685 memset(ret, 0, sizeof(struct ref) + namelen);
686 return ret;
687 }
688
689 static struct ref *copy_ref(const struct ref *ref)
690 {
691 struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
692 memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
693 ret->next = NULL;
694 return ret;
695 }
696
697 struct ref *copy_ref_list(const struct ref *ref)
698 {
699 struct ref *ret = NULL;
700 struct ref **tail = &ret;
701 while (ref) {
702 *tail = copy_ref(ref);
703 ref = ref->next;
704 tail = &((*tail)->next);
705 }
706 return ret;
707 }
708
709 void free_refs(struct ref *ref)
710 {
711 struct ref *next;
712 while (ref) {
713 next = ref->next;
714 free(ref->peer_ref);
715 free(ref);
716 ref = next;
717 }
718 }
719
720 static int count_refspec_match(const char *pattern,
721 struct ref *refs,
722 struct ref **matched_ref)
723 {
724 int patlen = strlen(pattern);
725 struct ref *matched_weak = NULL;
726 struct ref *matched = NULL;
727 int weak_match = 0;
728 int match = 0;
729
730 for (weak_match = match = 0; refs; refs = refs->next) {
731 char *name = refs->name;
732 int namelen = strlen(name);
733
734 if (!refname_match(pattern, name, ref_rev_parse_rules))
735 continue;
736
737 /* A match is "weak" if it is with refs outside
738 * heads or tags, and did not specify the pattern
739 * in full (e.g. "refs/remotes/origin/master") or at
740 * least from the toplevel (e.g. "remotes/origin/master");
741 * otherwise "git push $URL master" would result in
742 * ambiguity between remotes/origin/master and heads/master
743 * at the remote site.
744 */
745 if (namelen != patlen &&
746 patlen != namelen - 5 &&
747 prefixcmp(name, "refs/heads/") &&
748 prefixcmp(name, "refs/tags/")) {
749 /* We want to catch the case where only weak
750 * matches are found and there are multiple
751 * matches, and where more than one strong
752 * matches are found, as ambiguous. One
753 * strong match with zero or more weak matches
754 * are acceptable as a unique match.
755 */
756 matched_weak = refs;
757 weak_match++;
758 }
759 else {
760 matched = refs;
761 match++;
762 }
763 }
764 if (!matched) {
765 *matched_ref = matched_weak;
766 return weak_match;
767 }
768 else {
769 *matched_ref = matched;
770 return match;
771 }
772 }
773
774 static void tail_link_ref(struct ref *ref, struct ref ***tail)
775 {
776 **tail = ref;
777 while (ref->next)
778 ref = ref->next;
779 *tail = &ref->next;
780 }
781
782 static struct ref *try_explicit_object_name(const char *name)
783 {
784 unsigned char sha1[20];
785 struct ref *ref;
786 int len;
787
788 if (!*name) {
789 ref = alloc_ref(20);
790 strcpy(ref->name, "(delete)");
791 hashclr(ref->new_sha1);
792 return ref;
793 }
794 if (get_sha1(name, sha1))
795 return NULL;
796 len = strlen(name) + 1;
797 ref = alloc_ref(len);
798 memcpy(ref->name, name, len);
799 hashcpy(ref->new_sha1, sha1);
800 return ref;
801 }
802
803 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
804 {
805 struct ref *ret;
806 size_t len;
807
808 len = strlen(name) + 1;
809 ret = alloc_ref(len);
810 memcpy(ret->name, name, len);
811 tail_link_ref(ret, tail);
812 return ret;
813 }
814
815 static int match_explicit(struct ref *src, struct ref *dst,
816 struct ref ***dst_tail,
817 struct refspec *rs,
818 int errs)
819 {
820 struct ref *matched_src, *matched_dst;
821
822 const char *dst_value = rs->dst;
823
824 if (rs->pattern)
825 return errs;
826
827 matched_src = matched_dst = NULL;
828 switch (count_refspec_match(rs->src, src, &matched_src)) {
829 case 1:
830 break;
831 case 0:
832 /* The source could be in the get_sha1() format
833 * not a reference name. :refs/other is a
834 * way to delete 'other' ref at the remote end.
835 */
836 matched_src = try_explicit_object_name(rs->src);
837 if (!matched_src)
838 error("src refspec %s does not match any.", rs->src);
839 break;
840 default:
841 matched_src = NULL;
842 error("src refspec %s matches more than one.", rs->src);
843 break;
844 }
845
846 if (!matched_src)
847 errs = 1;
848
849 if (!dst_value) {
850 unsigned char sha1[20];
851 int flag;
852
853 if (!matched_src)
854 return errs;
855 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
856 if (!dst_value ||
857 ((flag & REF_ISSYMREF) &&
858 prefixcmp(dst_value, "refs/heads/")))
859 die("%s cannot be resolved to branch.",
860 matched_src->name);
861 }
862
863 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
864 case 1:
865 break;
866 case 0:
867 if (!memcmp(dst_value, "refs/", 5))
868 matched_dst = make_linked_ref(dst_value, dst_tail);
869 else
870 error("dst refspec %s does not match any "
871 "existing ref on the remote and does "
872 "not start with refs/.", dst_value);
873 break;
874 default:
875 matched_dst = NULL;
876 error("dst refspec %s matches more than one.",
877 dst_value);
878 break;
879 }
880 if (errs || !matched_dst)
881 return 1;
882 if (matched_dst->peer_ref) {
883 errs = 1;
884 error("dst ref %s receives from more than one src.",
885 matched_dst->name);
886 }
887 else {
888 matched_dst->peer_ref = matched_src;
889 matched_dst->force = rs->force;
890 }
891 return errs;
892 }
893
894 static int match_explicit_refs(struct ref *src, struct ref *dst,
895 struct ref ***dst_tail, struct refspec *rs,
896 int rs_nr)
897 {
898 int i, errs;
899 for (i = errs = 0; i < rs_nr; i++)
900 errs |= match_explicit(src, dst, dst_tail, &rs[i], errs);
901 return -errs;
902 }
903
904 static const struct refspec *check_pattern_match(const struct refspec *rs,
905 int rs_nr,
906 const struct ref *src)
907 {
908 int i;
909 for (i = 0; i < rs_nr; i++) {
910 if (rs[i].pattern &&
911 !prefixcmp(src->name, rs[i].src) &&
912 src->name[strlen(rs[i].src)] == '/')
913 return rs + i;
914 }
915 return NULL;
916 }
917
918 /*
919 * Note. This is used only by "push"; refspec matching rules for
920 * push and fetch are subtly different, so do not try to reuse it
921 * without thinking.
922 */
923 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
924 int nr_refspec, const char **refspec, int flags)
925 {
926 struct refspec *rs =
927 parse_push_refspec(nr_refspec, (const char **) refspec);
928 int send_all = flags & MATCH_REFS_ALL;
929 int send_mirror = flags & MATCH_REFS_MIRROR;
930
931 if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
932 return -1;
933
934 /* pick the remainder */
935 for ( ; src; src = src->next) {
936 struct ref *dst_peer;
937 const struct refspec *pat = NULL;
938 char *dst_name;
939 if (src->peer_ref)
940 continue;
941 if (nr_refspec) {
942 pat = check_pattern_match(rs, nr_refspec, src);
943 if (!pat)
944 continue;
945 }
946 else if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
947 /*
948 * "matching refs"; traditionally we pushed everything
949 * including refs outside refs/heads/ hierarchy, but
950 * that does not make much sense these days.
951 */
952 continue;
953
954 if (pat) {
955 const char *dst_side = pat->dst ? pat->dst : pat->src;
956 dst_name = xmalloc(strlen(dst_side) +
957 strlen(src->name) -
958 strlen(pat->src) + 2);
959 strcpy(dst_name, dst_side);
960 strcat(dst_name, src->name + strlen(pat->src));
961 } else
962 dst_name = xstrdup(src->name);
963 dst_peer = find_ref_by_name(dst, dst_name);
964 if (dst_peer && dst_peer->peer_ref)
965 /* We're already sending something to this ref. */
966 goto free_name;
967
968 if (!dst_peer && !nr_refspec && !(send_all || send_mirror))
969 /*
970 * Remote doesn't have it, and we have no
971 * explicit pattern, and we don't have
972 * --all nor --mirror.
973 */
974 goto free_name;
975 if (!dst_peer) {
976 /* Create a new one and link it */
977 dst_peer = make_linked_ref(dst_name, dst_tail);
978 hashcpy(dst_peer->new_sha1, src->new_sha1);
979 }
980 dst_peer->peer_ref = src;
981 if (pat)
982 dst_peer->force = pat->force;
983 free_name:
984 free(dst_name);
985 }
986 return 0;
987 }
988
989 struct branch *branch_get(const char *name)
990 {
991 struct branch *ret;
992
993 read_config();
994 if (!name || !*name || !strcmp(name, "HEAD"))
995 ret = current_branch;
996 else
997 ret = make_branch(name, 0);
998 if (ret && ret->remote_name) {
999 ret->remote = remote_get(ret->remote_name);
1000 if (ret->merge_nr) {
1001 int i;
1002 ret->merge = xcalloc(sizeof(*ret->merge),
1003 ret->merge_nr);
1004 for (i = 0; i < ret->merge_nr; i++) {
1005 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1006 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1007 remote_find_tracking(ret->remote,
1008 ret->merge[i]);
1009 }
1010 }
1011 }
1012 return ret;
1013 }
1014
1015 int branch_has_merge_config(struct branch *branch)
1016 {
1017 return branch && !!branch->merge;
1018 }
1019
1020 int branch_merge_matches(struct branch *branch,
1021 int i,
1022 const char *refname)
1023 {
1024 if (!branch || i < 0 || i >= branch->merge_nr)
1025 return 0;
1026 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1027 }
1028
1029 static struct ref *get_expanded_map(const struct ref *remote_refs,
1030 const struct refspec *refspec)
1031 {
1032 const struct ref *ref;
1033 struct ref *ret = NULL;
1034 struct ref **tail = &ret;
1035
1036 int remote_prefix_len = strlen(refspec->src);
1037 int local_prefix_len = strlen(refspec->dst);
1038
1039 for (ref = remote_refs; ref; ref = ref->next) {
1040 if (strchr(ref->name, '^'))
1041 continue; /* a dereference item */
1042 if (!prefixcmp(ref->name, refspec->src)) {
1043 const char *match;
1044 struct ref *cpy = copy_ref(ref);
1045 match = ref->name + remote_prefix_len;
1046
1047 cpy->peer_ref = alloc_ref(local_prefix_len +
1048 strlen(match) + 1);
1049 sprintf(cpy->peer_ref->name, "%s%s",
1050 refspec->dst, match);
1051 if (refspec->force)
1052 cpy->peer_ref->force = 1;
1053 *tail = cpy;
1054 tail = &cpy->next;
1055 }
1056 }
1057
1058 return ret;
1059 }
1060
1061 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1062 {
1063 const struct ref *ref;
1064 for (ref = refs; ref; ref = ref->next) {
1065 if (refname_match(name, ref->name, ref_fetch_rules))
1066 return ref;
1067 }
1068 return NULL;
1069 }
1070
1071 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1072 {
1073 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1074
1075 if (!ref)
1076 return NULL;
1077
1078 return copy_ref(ref);
1079 }
1080
1081 static struct ref *get_local_ref(const char *name)
1082 {
1083 struct ref *ret;
1084 if (!name)
1085 return NULL;
1086
1087 if (!prefixcmp(name, "refs/")) {
1088 ret = alloc_ref(strlen(name) + 1);
1089 strcpy(ret->name, name);
1090 return ret;
1091 }
1092
1093 if (!prefixcmp(name, "heads/") ||
1094 !prefixcmp(name, "tags/") ||
1095 !prefixcmp(name, "remotes/")) {
1096 ret = alloc_ref(strlen(name) + 6);
1097 sprintf(ret->name, "refs/%s", name);
1098 return ret;
1099 }
1100
1101 ret = alloc_ref(strlen(name) + 12);
1102 sprintf(ret->name, "refs/heads/%s", name);
1103 return ret;
1104 }
1105
1106 int get_fetch_map(const struct ref *remote_refs,
1107 const struct refspec *refspec,
1108 struct ref ***tail,
1109 int missing_ok)
1110 {
1111 struct ref *ref_map, **rmp;
1112
1113 if (refspec->pattern) {
1114 ref_map = get_expanded_map(remote_refs, refspec);
1115 } else {
1116 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1117
1118 ref_map = get_remote_ref(remote_refs, name);
1119 if (!missing_ok && !ref_map)
1120 die("Couldn't find remote ref %s", name);
1121 if (ref_map) {
1122 ref_map->peer_ref = get_local_ref(refspec->dst);
1123 if (ref_map->peer_ref && refspec->force)
1124 ref_map->peer_ref->force = 1;
1125 }
1126 }
1127
1128 for (rmp = &ref_map; *rmp; ) {
1129 if ((*rmp)->peer_ref) {
1130 int st = check_ref_format((*rmp)->peer_ref->name + 5);
1131 if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
1132 struct ref *ignore = *rmp;
1133 error("* Ignoring funny ref '%s' locally",
1134 (*rmp)->peer_ref->name);
1135 *rmp = (*rmp)->next;
1136 free(ignore->peer_ref);
1137 free(ignore);
1138 continue;
1139 }
1140 }
1141 rmp = &((*rmp)->next);
1142 }
1143
1144 if (ref_map)
1145 tail_link_ref(ref_map, tail);
1146
1147 return 0;
1148 }