Add matching and parsing for fetch-side refspec rules
[git/git.git] / remote.c
1 #include "cache.h"
2 #include "remote.h"
3 #include "refs.h"
4
5 static struct remote **remotes;
6 static int allocated_remotes;
7
8 static struct branch **branches;
9 static int allocated_branches;
10
11 static struct branch *current_branch;
12 static const char *default_remote_name;
13
14 #define BUF_SIZE (2048)
15 static char buffer[BUF_SIZE];
16
17 static void add_push_refspec(struct remote *remote, const char *ref)
18 {
19 int nr = remote->push_refspec_nr + 1;
20 remote->push_refspec =
21 xrealloc(remote->push_refspec, nr * sizeof(char *));
22 remote->push_refspec[nr-1] = ref;
23 remote->push_refspec_nr = nr;
24 }
25
26 static void add_fetch_refspec(struct remote *remote, const char *ref)
27 {
28 int nr = remote->fetch_refspec_nr + 1;
29 remote->fetch_refspec =
30 xrealloc(remote->fetch_refspec, nr * sizeof(char *));
31 remote->fetch_refspec[nr-1] = ref;
32 remote->fetch_refspec_nr = nr;
33 }
34
35 static void add_uri(struct remote *remote, const char *uri)
36 {
37 int nr = remote->uri_nr + 1;
38 remote->uri =
39 xrealloc(remote->uri, nr * sizeof(char *));
40 remote->uri[nr-1] = uri;
41 remote->uri_nr = nr;
42 }
43
44 static struct remote *make_remote(const char *name, int len)
45 {
46 int i, empty = -1;
47
48 for (i = 0; i < allocated_remotes; i++) {
49 if (!remotes[i]) {
50 if (empty < 0)
51 empty = i;
52 } else {
53 if (len ? (!strncmp(name, remotes[i]->name, len) &&
54 !remotes[i]->name[len]) :
55 !strcmp(name, remotes[i]->name))
56 return remotes[i];
57 }
58 }
59
60 if (empty < 0) {
61 empty = allocated_remotes;
62 allocated_remotes += allocated_remotes ? allocated_remotes : 1;
63 remotes = xrealloc(remotes,
64 sizeof(*remotes) * allocated_remotes);
65 memset(remotes + empty, 0,
66 (allocated_remotes - empty) * sizeof(*remotes));
67 }
68 remotes[empty] = xcalloc(1, sizeof(struct remote));
69 if (len)
70 remotes[empty]->name = xstrndup(name, len);
71 else
72 remotes[empty]->name = xstrdup(name);
73 return remotes[empty];
74 }
75
76 static void add_merge(struct branch *branch, const char *name)
77 {
78 int nr = branch->merge_nr + 1;
79 branch->merge_name =
80 xrealloc(branch->merge_name, nr * sizeof(char *));
81 branch->merge_name[nr-1] = name;
82 branch->merge_nr = nr;
83 }
84
85 static struct branch *make_branch(const char *name, int len)
86 {
87 int i, empty = -1;
88 char *refname;
89
90 for (i = 0; i < allocated_branches; i++) {
91 if (!branches[i]) {
92 if (empty < 0)
93 empty = i;
94 } else {
95 if (len ? (!strncmp(name, branches[i]->name, len) &&
96 !branches[i]->name[len]) :
97 !strcmp(name, branches[i]->name))
98 return branches[i];
99 }
100 }
101
102 if (empty < 0) {
103 empty = allocated_branches;
104 allocated_branches += allocated_branches ? allocated_branches : 1;
105 branches = xrealloc(branches,
106 sizeof(*branches) * allocated_branches);
107 memset(branches + empty, 0,
108 (allocated_branches - empty) * sizeof(*branches));
109 }
110 branches[empty] = xcalloc(1, sizeof(struct branch));
111 if (len)
112 branches[empty]->name = xstrndup(name, len);
113 else
114 branches[empty]->name = xstrdup(name);
115 refname = malloc(strlen(name) + strlen("refs/heads/") + 1);
116 strcpy(refname, "refs/heads/");
117 strcpy(refname + strlen("refs/heads/"),
118 branches[empty]->name);
119 branches[empty]->refname = refname;
120
121 return branches[empty];
122 }
123
124 static void read_remotes_file(struct remote *remote)
125 {
126 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
127
128 if (!f)
129 return;
130 while (fgets(buffer, BUF_SIZE, f)) {
131 int value_list;
132 char *s, *p;
133
134 if (!prefixcmp(buffer, "URL:")) {
135 value_list = 0;
136 s = buffer + 4;
137 } else if (!prefixcmp(buffer, "Push:")) {
138 value_list = 1;
139 s = buffer + 5;
140 } else if (!prefixcmp(buffer, "Pull:")) {
141 value_list = 2;
142 s = buffer + 5;
143 } else
144 continue;
145
146 while (isspace(*s))
147 s++;
148 if (!*s)
149 continue;
150
151 p = s + strlen(s);
152 while (isspace(p[-1]))
153 *--p = 0;
154
155 switch (value_list) {
156 case 0:
157 add_uri(remote, xstrdup(s));
158 break;
159 case 1:
160 add_push_refspec(remote, xstrdup(s));
161 break;
162 case 2:
163 add_fetch_refspec(remote, xstrdup(s));
164 break;
165 }
166 }
167 fclose(f);
168 }
169
170 static void read_branches_file(struct remote *remote)
171 {
172 const char *slash = strchr(remote->name, '/');
173 char *frag;
174 char *branch;
175 int n = slash ? slash - remote->name : 1000;
176 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
177 char *s, *p;
178 int len;
179
180 if (!f)
181 return;
182 s = fgets(buffer, BUF_SIZE, f);
183 fclose(f);
184 if (!s)
185 return;
186 while (isspace(*s))
187 s++;
188 if (!*s)
189 return;
190 p = s + strlen(s);
191 while (isspace(p[-1]))
192 *--p = 0;
193 len = p - s;
194 if (slash)
195 len += strlen(slash);
196 p = xmalloc(len + 1);
197 strcpy(p, s);
198 if (slash)
199 strcat(p, slash);
200 frag = strchr(p, '#');
201 if (frag) {
202 *(frag++) = '\0';
203 branch = xmalloc(strlen(frag) + 12);
204 strcpy(branch, "refs/heads/");
205 strcat(branch, frag);
206 } else {
207 branch = "refs/heads/master";
208 }
209 add_uri(remote, p);
210 add_fetch_refspec(remote, branch);
211 remote->fetch_tags = 1; /* always auto-follow */
212 }
213
214 static int handle_config(const char *key, const char *value)
215 {
216 const char *name;
217 const char *subkey;
218 struct remote *remote;
219 struct branch *branch;
220 if (!prefixcmp(key, "branch.")) {
221 name = key + 7;
222 subkey = strrchr(name, '.');
223 branch = make_branch(name, subkey - name);
224 if (!subkey)
225 return 0;
226 if (!value)
227 return 0;
228 if (!strcmp(subkey, ".remote")) {
229 branch->remote_name = xstrdup(value);
230 if (branch == current_branch)
231 default_remote_name = branch->remote_name;
232 } else if (!strcmp(subkey, ".merge"))
233 add_merge(branch, xstrdup(value));
234 return 0;
235 }
236 if (prefixcmp(key, "remote."))
237 return 0;
238 name = key + 7;
239 subkey = strrchr(name, '.');
240 if (!subkey)
241 return error("Config with no key for remote %s", name);
242 if (*subkey == '/') {
243 warning("Config remote shorthand cannot begin with '/': %s", name);
244 return 0;
245 }
246 remote = make_remote(name, subkey - name);
247 if (!value) {
248 /* if we ever have a boolean variable, e.g. "remote.*.disabled"
249 * [remote "frotz"]
250 * disabled
251 * is a valid way to set it to true; we get NULL in value so
252 * we need to handle it here.
253 *
254 * if (!strcmp(subkey, ".disabled")) {
255 * val = git_config_bool(key, value);
256 * return 0;
257 * } else
258 *
259 */
260 return 0; /* ignore unknown booleans */
261 }
262 if (!strcmp(subkey, ".url")) {
263 add_uri(remote, xstrdup(value));
264 } else if (!strcmp(subkey, ".push")) {
265 add_push_refspec(remote, xstrdup(value));
266 } else if (!strcmp(subkey, ".fetch")) {
267 add_fetch_refspec(remote, xstrdup(value));
268 } else if (!strcmp(subkey, ".receivepack")) {
269 if (!remote->receivepack)
270 remote->receivepack = xstrdup(value);
271 else
272 error("more than one receivepack given, using the first");
273 } else if (!strcmp(subkey, ".uploadpack")) {
274 if (!remote->uploadpack)
275 remote->uploadpack = xstrdup(value);
276 else
277 error("more than one uploadpack given, using the first");
278 } else if (!strcmp(subkey, ".tagopt")) {
279 if (!strcmp(value, "--no-tags"))
280 remote->fetch_tags = -1;
281 }
282 return 0;
283 }
284
285 static void read_config(void)
286 {
287 unsigned char sha1[20];
288 const char *head_ref;
289 int flag;
290 if (default_remote_name) // did this already
291 return;
292 default_remote_name = xstrdup("origin");
293 current_branch = NULL;
294 head_ref = resolve_ref("HEAD", sha1, 0, &flag);
295 if (head_ref && (flag & REF_ISSYMREF) &&
296 !prefixcmp(head_ref, "refs/heads/")) {
297 current_branch =
298 make_branch(head_ref + strlen("refs/heads/"), 0);
299 }
300 git_config(handle_config);
301 }
302
303 struct refspec *parse_ref_spec(int nr_refspec, const char **refspec)
304 {
305 int i;
306 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
307 for (i = 0; i < nr_refspec; i++) {
308 const char *sp, *ep, *gp;
309 sp = refspec[i];
310 if (*sp == '+') {
311 rs[i].force = 1;
312 sp++;
313 }
314 gp = strchr(sp, '*');
315 ep = strchr(sp, ':');
316 if (gp && ep && gp > ep)
317 gp = NULL;
318 if (ep) {
319 if (ep[1]) {
320 const char *glob = strchr(ep + 1, '*');
321 if (!glob)
322 gp = NULL;
323 if (gp)
324 rs[i].dst = xstrndup(ep + 1,
325 glob - ep - 1);
326 else
327 rs[i].dst = xstrdup(ep + 1);
328 }
329 } else {
330 ep = sp + strlen(sp);
331 }
332 if (gp) {
333 rs[i].pattern = 1;
334 ep = gp;
335 }
336 rs[i].src = xstrndup(sp, ep - sp);
337 }
338 return rs;
339 }
340
341 struct remote *remote_get(const char *name)
342 {
343 struct remote *ret;
344
345 read_config();
346 if (!name)
347 name = default_remote_name;
348 ret = make_remote(name, 0);
349 if (name[0] != '/') {
350 if (!ret->uri)
351 read_remotes_file(ret);
352 if (!ret->uri)
353 read_branches_file(ret);
354 }
355 if (!ret->uri)
356 add_uri(ret, name);
357 if (!ret->uri)
358 return NULL;
359 if (!strcmp(name, ".")) {
360 // we always fetch "refs/*:refs/*", which is trivial
361 add_fetch_refspec(ret, "refs/*:refs/*");
362 }
363 ret->fetch = parse_ref_spec(ret->fetch_refspec_nr, ret->fetch_refspec);
364 ret->push = parse_ref_spec(ret->push_refspec_nr, ret->push_refspec);
365 return ret;
366 }
367
368 int for_each_remote(each_remote_fn fn, void *priv)
369 {
370 int i, result = 0;
371 read_config();
372 for (i = 0; i < allocated_remotes && !result; i++) {
373 struct remote *r = remotes[i];
374 if (!r)
375 continue;
376 if (!r->fetch)
377 r->fetch = parse_ref_spec(r->fetch_refspec_nr,
378 r->fetch_refspec);
379 if (!r->push)
380 r->push = parse_ref_spec(r->push_refspec_nr,
381 r->push_refspec);
382 result = fn(r, priv);
383 }
384 return result;
385 }
386
387 int remote_has_uri(struct remote *remote, const char *uri)
388 {
389 int i;
390 for (i = 0; i < remote->uri_nr; i++) {
391 if (!strcmp(remote->uri[i], uri))
392 return 1;
393 }
394 return 0;
395 }
396
397 /*
398 * Returns true if, under the matching rules for fetching, name is the
399 * same as the given full name.
400 */
401 static int ref_matches_abbrev(const char *name, const char *full)
402 {
403 if (!prefixcmp(name, "refs/") || !strcmp(name, "HEAD"))
404 return !strcmp(name, full);
405 if (prefixcmp(full, "refs/"))
406 return 0;
407 if (!prefixcmp(name, "heads/") ||
408 !prefixcmp(name, "tags/") ||
409 !prefixcmp(name, "remotes/"))
410 return !strcmp(name, full + 5);
411 if (prefixcmp(full + 5, "heads/"))
412 return 0;
413 return !strcmp(full + 11, name);
414 }
415
416 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
417 {
418 int find_src = refspec->src == NULL;
419 char *needle, **result;
420 int i;
421
422 if (find_src) {
423 if (refspec->dst == NULL)
424 return error("find_tracking: need either src or dst");
425 needle = refspec->dst;
426 result = &refspec->src;
427 } else {
428 needle = refspec->src;
429 result = &refspec->dst;
430 }
431
432 for (i = 0; i < remote->fetch_refspec_nr; i++) {
433 struct refspec *fetch = &remote->fetch[i];
434 const char *key = find_src ? fetch->dst : fetch->src;
435 const char *value = find_src ? fetch->src : fetch->dst;
436 if (!fetch->dst)
437 continue;
438 if (fetch->pattern) {
439 if (!prefixcmp(needle, key)) {
440 *result = xmalloc(strlen(value) +
441 strlen(needle) -
442 strlen(key) + 1);
443 strcpy(*result, value);
444 strcpy(*result + strlen(value),
445 needle + strlen(key));
446 refspec->force = fetch->force;
447 return 0;
448 }
449 } else if (!strcmp(needle, key)) {
450 *result = xstrdup(value);
451 refspec->force = fetch->force;
452 return 0;
453 }
454 }
455 return -1;
456 }
457
458 struct ref *alloc_ref(unsigned namelen)
459 {
460 struct ref *ret = xmalloc(sizeof(struct ref) + namelen);
461 memset(ret, 0, sizeof(struct ref) + namelen);
462 return ret;
463 }
464
465 static struct ref *copy_ref(struct ref *ref)
466 {
467 struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
468 memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
469 ret->next = NULL;
470 return ret;
471 }
472
473 void free_refs(struct ref *ref)
474 {
475 struct ref *next;
476 while (ref) {
477 next = ref->next;
478 if (ref->peer_ref)
479 free(ref->peer_ref);
480 free(ref);
481 ref = next;
482 }
483 }
484
485 static int count_refspec_match(const char *pattern,
486 struct ref *refs,
487 struct ref **matched_ref)
488 {
489 int patlen = strlen(pattern);
490 struct ref *matched_weak = NULL;
491 struct ref *matched = NULL;
492 int weak_match = 0;
493 int match = 0;
494
495 for (weak_match = match = 0; refs; refs = refs->next) {
496 char *name = refs->name;
497 int namelen = strlen(name);
498
499 if (namelen < patlen ||
500 memcmp(name + namelen - patlen, pattern, patlen))
501 continue;
502 if (namelen != patlen && name[namelen - patlen - 1] != '/')
503 continue;
504
505 /* A match is "weak" if it is with refs outside
506 * heads or tags, and did not specify the pattern
507 * in full (e.g. "refs/remotes/origin/master") or at
508 * least from the toplevel (e.g. "remotes/origin/master");
509 * otherwise "git push $URL master" would result in
510 * ambiguity between remotes/origin/master and heads/master
511 * at the remote site.
512 */
513 if (namelen != patlen &&
514 patlen != namelen - 5 &&
515 prefixcmp(name, "refs/heads/") &&
516 prefixcmp(name, "refs/tags/")) {
517 /* We want to catch the case where only weak
518 * matches are found and there are multiple
519 * matches, and where more than one strong
520 * matches are found, as ambiguous. One
521 * strong match with zero or more weak matches
522 * are acceptable as a unique match.
523 */
524 matched_weak = refs;
525 weak_match++;
526 }
527 else {
528 matched = refs;
529 match++;
530 }
531 }
532 if (!matched) {
533 *matched_ref = matched_weak;
534 return weak_match;
535 }
536 else {
537 *matched_ref = matched;
538 return match;
539 }
540 }
541
542 static void tail_link_ref(struct ref *ref, struct ref ***tail)
543 {
544 **tail = ref;
545 while (ref->next)
546 ref = ref->next;
547 *tail = &ref->next;
548 }
549
550 static struct ref *try_explicit_object_name(const char *name)
551 {
552 unsigned char sha1[20];
553 struct ref *ref;
554 int len;
555
556 if (!*name) {
557 ref = alloc_ref(20);
558 strcpy(ref->name, "(delete)");
559 hashclr(ref->new_sha1);
560 return ref;
561 }
562 if (get_sha1(name, sha1))
563 return NULL;
564 len = strlen(name) + 1;
565 ref = alloc_ref(len);
566 memcpy(ref->name, name, len);
567 hashcpy(ref->new_sha1, sha1);
568 return ref;
569 }
570
571 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
572 {
573 struct ref *ret;
574 size_t len;
575
576 len = strlen(name) + 1;
577 ret = alloc_ref(len);
578 memcpy(ret->name, name, len);
579 tail_link_ref(ret, tail);
580 return ret;
581 }
582
583 static int match_explicit(struct ref *src, struct ref *dst,
584 struct ref ***dst_tail,
585 struct refspec *rs,
586 int errs)
587 {
588 struct ref *matched_src, *matched_dst;
589
590 const char *dst_value = rs->dst;
591
592 if (rs->pattern)
593 return errs;
594
595 matched_src = matched_dst = NULL;
596 switch (count_refspec_match(rs->src, src, &matched_src)) {
597 case 1:
598 break;
599 case 0:
600 /* The source could be in the get_sha1() format
601 * not a reference name. :refs/other is a
602 * way to delete 'other' ref at the remote end.
603 */
604 matched_src = try_explicit_object_name(rs->src);
605 if (matched_src)
606 break;
607 error("src refspec %s does not match any.",
608 rs->src);
609 break;
610 default:
611 matched_src = NULL;
612 error("src refspec %s matches more than one.",
613 rs->src);
614 break;
615 }
616
617 if (!matched_src)
618 errs = 1;
619
620 if (dst_value == NULL)
621 dst_value = matched_src->name;
622
623 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
624 case 1:
625 break;
626 case 0:
627 if (!memcmp(dst_value, "refs/", 5))
628 matched_dst = make_linked_ref(dst_value, dst_tail);
629 else
630 error("dst refspec %s does not match any "
631 "existing ref on the remote and does "
632 "not start with refs/.", dst_value);
633 break;
634 default:
635 matched_dst = NULL;
636 error("dst refspec %s matches more than one.",
637 dst_value);
638 break;
639 }
640 if (errs || matched_dst == NULL)
641 return 1;
642 if (matched_dst->peer_ref) {
643 errs = 1;
644 error("dst ref %s receives from more than one src.",
645 matched_dst->name);
646 }
647 else {
648 matched_dst->peer_ref = matched_src;
649 matched_dst->force = rs->force;
650 }
651 return errs;
652 }
653
654 static int match_explicit_refs(struct ref *src, struct ref *dst,
655 struct ref ***dst_tail, struct refspec *rs,
656 int rs_nr)
657 {
658 int i, errs;
659 for (i = errs = 0; i < rs_nr; i++)
660 errs |= match_explicit(src, dst, dst_tail, &rs[i], errs);
661 return -errs;
662 }
663
664 static struct ref *find_ref_by_name(struct ref *list, const char *name)
665 {
666 for ( ; list; list = list->next)
667 if (!strcmp(list->name, name))
668 return list;
669 return NULL;
670 }
671
672 static const struct refspec *check_pattern_match(const struct refspec *rs,
673 int rs_nr,
674 const struct ref *src)
675 {
676 int i;
677 for (i = 0; i < rs_nr; i++) {
678 if (rs[i].pattern && !prefixcmp(src->name, rs[i].src))
679 return rs + i;
680 }
681 return NULL;
682 }
683
684 /*
685 * Note. This is used only by "push"; refspec matching rules for
686 * push and fetch are subtly different, so do not try to reuse it
687 * without thinking.
688 */
689 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
690 int nr_refspec, char **refspec, int all)
691 {
692 struct refspec *rs =
693 parse_ref_spec(nr_refspec, (const char **) refspec);
694
695 if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
696 return -1;
697
698 /* pick the remainder */
699 for ( ; src; src = src->next) {
700 struct ref *dst_peer;
701 const struct refspec *pat = NULL;
702 char *dst_name;
703 if (src->peer_ref)
704 continue;
705 if (nr_refspec) {
706 pat = check_pattern_match(rs, nr_refspec, src);
707 if (!pat)
708 continue;
709 }
710 else if (prefixcmp(src->name, "refs/heads/"))
711 /*
712 * "matching refs"; traditionally we pushed everything
713 * including refs outside refs/heads/ hierarchy, but
714 * that does not make much sense these days.
715 */
716 continue;
717
718 if (pat) {
719 const char *dst_side = pat->dst ? pat->dst : pat->src;
720 dst_name = xmalloc(strlen(dst_side) +
721 strlen(src->name) -
722 strlen(pat->src) + 2);
723 strcpy(dst_name, dst_side);
724 strcat(dst_name, src->name + strlen(pat->src));
725 } else
726 dst_name = xstrdup(src->name);
727 dst_peer = find_ref_by_name(dst, dst_name);
728 if (dst_peer && dst_peer->peer_ref)
729 /* We're already sending something to this ref. */
730 goto free_name;
731 if (!dst_peer && !nr_refspec && !all)
732 /* Remote doesn't have it, and we have no
733 * explicit pattern, and we don't have
734 * --all. */
735 goto free_name;
736 if (!dst_peer) {
737 /* Create a new one and link it */
738 dst_peer = make_linked_ref(dst_name, dst_tail);
739 hashcpy(dst_peer->new_sha1, src->new_sha1);
740 }
741 dst_peer->peer_ref = src;
742 free_name:
743 free(dst_name);
744 }
745 return 0;
746 }
747
748 struct branch *branch_get(const char *name)
749 {
750 struct branch *ret;
751
752 read_config();
753 if (!name || !*name || !strcmp(name, "HEAD"))
754 ret = current_branch;
755 else
756 ret = make_branch(name, 0);
757 if (ret && ret->remote_name) {
758 ret->remote = remote_get(ret->remote_name);
759 if (ret->merge_nr) {
760 int i;
761 ret->merge = xcalloc(sizeof(*ret->merge),
762 ret->merge_nr);
763 for (i = 0; i < ret->merge_nr; i++) {
764 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
765 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
766 remote_find_tracking(ret->remote,
767 ret->merge[i]);
768 }
769 }
770 }
771 return ret;
772 }
773
774 int branch_has_merge_config(struct branch *branch)
775 {
776 return branch && !!branch->merge;
777 }
778
779 int branch_merges(struct branch *branch, const char *refname)
780 {
781 int i;
782 if (!branch)
783 return 0;
784 for (i = 0; i < branch->merge_nr; i++) {
785 if (ref_matches_abbrev(branch->merge[i]->src, refname))
786 return 1;
787 }
788 return 0;
789 }
790
791 static struct ref *get_expanded_map(struct ref *remote_refs,
792 const struct refspec *refspec)
793 {
794 struct ref *ref;
795 struct ref *ret = NULL;
796 struct ref **tail = &ret;
797
798 int remote_prefix_len = strlen(refspec->src);
799 int local_prefix_len = strlen(refspec->dst);
800
801 for (ref = remote_refs; ref; ref = ref->next) {
802 if (strchr(ref->name, '^'))
803 continue; /* a dereference item */
804 if (!prefixcmp(ref->name, refspec->src)) {
805 char *match;
806 struct ref *cpy = copy_ref(ref);
807 match = ref->name + remote_prefix_len;
808
809 cpy->peer_ref = alloc_ref(local_prefix_len +
810 strlen(match) + 1);
811 sprintf(cpy->peer_ref->name, "%s%s",
812 refspec->dst, match);
813 if (refspec->force)
814 cpy->peer_ref->force = 1;
815 *tail = cpy;
816 tail = &cpy->next;
817 }
818 }
819
820 return ret;
821 }
822
823 static struct ref *find_ref_by_name_abbrev(struct ref *refs, const char *name)
824 {
825 struct ref *ref;
826 for (ref = refs; ref; ref = ref->next) {
827 if (ref_matches_abbrev(name, ref->name))
828 return ref;
829 }
830 return NULL;
831 }
832
833 struct ref *get_remote_ref(struct ref *remote_refs, const char *name)
834 {
835 struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
836
837 if (!ref)
838 die("Couldn't find remote ref %s\n", name);
839
840 return copy_ref(ref);
841 }
842
843 static struct ref *get_local_ref(const char *name)
844 {
845 struct ref *ret;
846 if (!name)
847 return NULL;
848
849 if (!prefixcmp(name, "refs/")) {
850 ret = alloc_ref(strlen(name) + 1);
851 strcpy(ret->name, name);
852 return ret;
853 }
854
855 if (!prefixcmp(name, "heads/") ||
856 !prefixcmp(name, "tags/") ||
857 !prefixcmp(name, "remotes/")) {
858 ret = alloc_ref(strlen(name) + 6);
859 sprintf(ret->name, "refs/%s", name);
860 return ret;
861 }
862
863 ret = alloc_ref(strlen(name) + 12);
864 sprintf(ret->name, "refs/heads/%s", name);
865 return ret;
866 }
867
868 int get_fetch_map(struct ref *remote_refs,
869 const struct refspec *refspec,
870 struct ref ***tail)
871 {
872 struct ref *ref_map, *rm;
873
874 if (refspec->pattern) {
875 ref_map = get_expanded_map(remote_refs, refspec);
876 } else {
877 ref_map = get_remote_ref(remote_refs,
878 refspec->src[0] ?
879 refspec->src : "HEAD");
880
881 ref_map->peer_ref = get_local_ref(refspec->dst);
882
883 if (refspec->force)
884 ref_map->peer_ref->force = 1;
885 }
886
887 for (rm = ref_map; rm; rm = rm->next) {
888 if (rm->peer_ref && check_ref_format(rm->peer_ref->name + 5))
889 die("* refusing to create funny ref '%s' locally",
890 rm->peer_ref->name);
891 }
892
893 tail_link_ref(ref_map, tail);
894
895 return 0;
896 }