1#include "cache.h"
2#include "remote.h"
3#include "refs.h"
4struct counted_string {
6 size_t len;
7 const char *s;
8};
9struct 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};
16static struct remote **remotes;
18static int remotes_alloc;
19static int remotes_nr;
20static struct branch **branches;
22static int branches_alloc;
23static int branches_nr;
24static struct branch *current_branch;
26static const char *default_remote_name;
27static struct rewrite **rewrite;
29static int rewrite_alloc;
30static int rewrite_nr;
31#define BUF_SIZE (2048)
33static char buffer[BUF_SIZE];
34static 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 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 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}
65static 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}
73static 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}
81static 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}
87static void add_url_alias(struct remote *remote, const char *url)
89{
90 add_url(remote, alias_url(url));
91}
92static struct remote *make_remote(const char *name, int len)
94{
95 struct remote *ret;
96 int i;
97 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 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}
114static 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}
121static struct branch *make_branch(const char *name, int len)
123{
124 struct branch *ret;
125 int i;
126 char *refname;
127 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 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 return ret;
148}
149static struct rewrite *make_rewrite(const char *base, int len)
151{
152 struct rewrite *ret;
153 int i;
154 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 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}
176static 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}
184static void read_remotes_file(struct remote *remote)
186{
187 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
188 if (!f)
190 return;
191 while (fgets(buffer, BUF_SIZE, f)) {
192 int value_list;
193 char *s, *p;
194 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 while (isspace(*s))
208 s++;
209 if (!*s)
210 continue;
211 p = s + strlen(s);
213 while (isspace(p[-1]))
214 *--p = 0;
215 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}
230static void read_branches_file(struct remote *remote)
232{
233 const char *slash = strchr(remote->name, '/');
234 char *frag;
235 char *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 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 frag = strchr(p, '#');
262 if (frag) {
263 *(frag++) = '\0';
264 branch = xmalloc(strlen(frag) + 12);
265 strcpy(branch, "refs/heads/");
266 strcat(branch, frag);
267 } else {
268 branch = "refs/heads/master";
269 }
270 add_url_alias(remote, p);
271 add_fetch_refspec(remote, branch);
272 remote->fetch_tags = 1; /* always auto-follow */
273}
274static int handle_config(const char *key, const char *value)
276{
277 const char *name;
278 const char *subkey;
279 struct remote *remote;
280 struct branch *branch;
281 if (!prefixcmp(key, "branch.")) {
282 name = key + 7;
283 subkey = strrchr(name, '.');
284 if (!subkey)
285 return 0;
286 branch = make_branch(name, subkey - name);
287 if (!strcmp(subkey, ".remote")) {
288 if (!value)
289 return config_error_nonbool(key);
290 branch->remote_name = xstrdup(value);
291 if (branch == current_branch)
292 default_remote_name = branch->remote_name;
293 } else if (!strcmp(subkey, ".merge")) {
294 if (!value)
295 return config_error_nonbool(key);
296 add_merge(branch, xstrdup(value));
297 }
298 return 0;
299 }
300 if (!prefixcmp(key, "url.")) {
301 struct rewrite *rewrite;
302 name = key + 5;
303 subkey = strrchr(name, '.');
304 if (!subkey)
305 return 0;
306 rewrite = make_rewrite(name, subkey - name);
307 if (!strcmp(subkey, ".insteadof")) {
308 if (!value)
309 return config_error_nonbool(key);
310 add_instead_of(rewrite, xstrdup(value));
311 }
312 }
313 if (prefixcmp(key, "remote."))
314 return 0;
315 name = key + 7;
316 subkey = strrchr(name, '.');
317 if (!subkey)
318 return error("Config with no key for remote %s", name);
319 if (*subkey == '/') {
320 warning("Config remote shorthand cannot begin with '/': %s", name);
321 return 0;
322 }
323 remote = make_remote(name, subkey - name);
324 if (!value) {
325 /* if we ever have a boolean variable, e.g. "remote.*.disabled"
326 * [remote "frotz"]
327 * disabled
328 * is a valid way to set it to true; we get NULL in value so
329 * we need to handle it here.
330 *
331 * if (!strcmp(subkey, ".disabled")) {
332 * val = git_config_bool(key, value);
333 * return 0;
334 * } else
335 *
336 */
337 return 0; /* ignore unknown booleans */
338 }
339 if (!strcmp(subkey, ".url")) {
340 add_url(remote, xstrdup(value));
341 } else if (!strcmp(subkey, ".push")) {
342 add_push_refspec(remote, xstrdup(value));
343 } else if (!strcmp(subkey, ".fetch")) {
344 add_fetch_refspec(remote, xstrdup(value));
345 } else if (!strcmp(subkey, ".receivepack")) {
346 if (!remote->receivepack)
347 remote->receivepack = xstrdup(value);
348 else
349 error("more than one receivepack given, using the first");
350 } else if (!strcmp(subkey, ".uploadpack")) {
351 if (!remote->uploadpack)
352 remote->uploadpack = xstrdup(value);
353 else
354 error("more than one uploadpack given, using the first");
355 } else if (!strcmp(subkey, ".tagopt")) {
356 if (!strcmp(value, "--no-tags"))
357 remote->fetch_tags = -1;
358 } else if (!strcmp(subkey, ".proxy")) {
359 remote->http_proxy = xstrdup(value);
360 }
361 return 0;
362}
363static void alias_all_urls(void)
365{
366 int i, j;
367 for (i = 0; i < remotes_nr; i++) {
368 if (!remotes[i])
369 continue;
370 for (j = 0; j < remotes[i]->url_nr; j++) {
371 remotes[i]->url[j] = alias_url(remotes[i]->url[j]);
372 }
373 }
374}
375static void read_config(void)
377{
378 unsigned char sha1[20];
379 const char *head_ref;
380 int flag;
381 if (default_remote_name) // did this already
382 return;
383 default_remote_name = xstrdup("origin");
384 current_branch = NULL;
385 head_ref = resolve_ref("HEAD", sha1, 0, &flag);
386 if (head_ref && (flag & REF_ISSYMREF) &&
387 !prefixcmp(head_ref, "refs/heads/")) {
388 current_branch =
389 make_branch(head_ref + strlen("refs/heads/"), 0);
390 }
391 git_config(handle_config);
392 alias_all_urls();
393}
394struct refspec *parse_ref_spec(int nr_refspec, const char **refspec)
396{
397 int i;
398 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
399 for (i = 0; i < nr_refspec; i++) {
400 const char *sp, *ep, *gp;
401 sp = refspec[i];
402 if (*sp == '+') {
403 rs[i].force = 1;
404 sp++;
405 }
406 gp = strchr(sp, '*');
407 ep = strchr(sp, ':');
408 if (gp && ep && gp > ep)
409 gp = NULL;
410 if (ep) {
411 if (ep[1]) {
412 const char *glob = strchr(ep + 1, '*');
413 if (!glob)
414 gp = NULL;
415 if (gp)
416 rs[i].dst = xstrndup(ep + 1,
417 glob - ep - 1);
418 else
419 rs[i].dst = xstrdup(ep + 1);
420 }
421 } else {
422 ep = sp + strlen(sp);
423 }
424 if (gp) {
425 rs[i].pattern = 1;
426 ep = gp;
427 }
428 rs[i].src = xstrndup(sp, ep - sp);
429 }
430 return rs;
431}
432static int valid_remote_nick(const char *name)
434{
435 if (!name[0] || /* not empty */
436 (name[0] == '.' && /* not "." */
437 (!name[1] || /* not ".." */
438 (name[1] == '.' && !name[2]))))
439 return 0;
440 return !strchr(name, '/'); /* no slash */
441}
442struct remote *remote_get(const char *name)
444{
445 struct remote *ret;
446 read_config();
448 if (!name)
449 name = default_remote_name;
450 ret = make_remote(name, 0);
451 if (valid_remote_nick(name)) {
452 if (!ret->url)
453 read_remotes_file(ret);
454 if (!ret->url)
455 read_branches_file(ret);
456 }
457 if (!ret->url)
458 add_url_alias(ret, name);
459 if (!ret->url)
460 return NULL;
461 ret->fetch = parse_ref_spec(ret->fetch_refspec_nr, ret->fetch_refspec);
462 ret->push = parse_ref_spec(ret->push_refspec_nr, ret->push_refspec);
463 return ret;
464}
465int for_each_remote(each_remote_fn fn, void *priv)
467{
468 int i, result = 0;
469 read_config();
470 for (i = 0; i < remotes_nr && !result; i++) {
471 struct remote *r = remotes[i];
472 if (!r)
473 continue;
474 if (!r->fetch)
475 r->fetch = parse_ref_spec(r->fetch_refspec_nr,
476 r->fetch_refspec);
477 if (!r->push)
478 r->push = parse_ref_spec(r->push_refspec_nr,
479 r->push_refspec);
480 result = fn(r, priv);
481 }
482 return result;
483}
484void ref_remove_duplicates(struct ref *ref_map)
486{
487 struct ref **posn;
488 struct ref *next;
489 for (; ref_map; ref_map = ref_map->next) {
490 if (!ref_map->peer_ref)
491 continue;
492 posn = &ref_map->next;
493 while (*posn) {
494 if ((*posn)->peer_ref &&
495 !strcmp((*posn)->peer_ref->name,
496 ref_map->peer_ref->name)) {
497 if (strcmp((*posn)->name, ref_map->name))
498 die("%s tracks both %s and %s",
499 ref_map->peer_ref->name,
500 (*posn)->name, ref_map->name);
501 next = (*posn)->next;
502 free((*posn)->peer_ref);
503 free(*posn);
504 *posn = next;
505 } else {
506 posn = &(*posn)->next;
507 }
508 }
509 }
510}
511int remote_has_url(struct remote *remote, const char *url)
513{
514 int i;
515 for (i = 0; i < remote->url_nr; i++) {
516 if (!strcmp(remote->url[i], url))
517 return 1;
518 }
519 return 0;
520}
521int remote_find_tracking(struct remote *remote, struct refspec *refspec)
523{
524 int find_src = refspec->src == NULL;
525 char *needle, **result;
526 int i;
527 if (find_src) {
529 if (!refspec->dst)
530 return error("find_tracking: need either src or dst");
531 needle = refspec->dst;
532 result = &refspec->src;
533 } else {
534 needle = refspec->src;
535 result = &refspec->dst;
536 }
537 for (i = 0; i < remote->fetch_refspec_nr; i++) {
539 struct refspec *fetch = &remote->fetch[i];
540 const char *key = find_src ? fetch->dst : fetch->src;
541 const char *value = find_src ? fetch->src : fetch->dst;
542 if (!fetch->dst)
543 continue;
544 if (fetch->pattern) {
545 if (!prefixcmp(needle, key)) {
546 *result = xmalloc(strlen(value) +
547 strlen(needle) -
548 strlen(key) + 1);
549 strcpy(*result, value);
550 strcpy(*result + strlen(value),
551 needle + strlen(key));
552 refspec->force = fetch->force;
553 return 0;
554 }
555 } else if (!strcmp(needle, key)) {
556 *result = xstrdup(value);
557 refspec->force = fetch->force;
558 return 0;
559 }
560 }
561 return -1;
562}
563struct ref *alloc_ref(unsigned namelen)
565{
566 struct ref *ret = xmalloc(sizeof(struct ref) + namelen);
567 memset(ret, 0, sizeof(struct ref) + namelen);
568 return ret;
569}
570static struct ref *copy_ref(const struct ref *ref)
572{
573 struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
574 memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
575 ret->next = NULL;
576 return ret;
577}
578struct ref *copy_ref_list(const struct ref *ref)
580{
581 struct ref *ret = NULL;
582 struct ref **tail = &ret;
583 while (ref) {
584 *tail = copy_ref(ref);
585 ref = ref->next;
586 tail = &((*tail)->next);
587 }
588 return ret;
589}
590void free_refs(struct ref *ref)
592{
593 struct ref *next;
594 while (ref) {
595 next = ref->next;
596 if (ref->peer_ref)
597 free(ref->peer_ref);
598 free(ref);
599 ref = next;
600 }
601}
602static int count_refspec_match(const char *pattern,
604 struct ref *refs,
605 struct ref **matched_ref)
606{
607 int patlen = strlen(pattern);
608 struct ref *matched_weak = NULL;
609 struct ref *matched = NULL;
610 int weak_match = 0;
611 int match = 0;
612 for (weak_match = match = 0; refs; refs = refs->next) {
614 char *name = refs->name;
615 int namelen = strlen(name);
616 if (!refname_match(pattern, name, ref_rev_parse_rules))
618 continue;
619 /* A match is "weak" if it is with refs outside
621 * heads or tags, and did not specify the pattern
622 * in full (e.g. "refs/remotes/origin/master") or at
623 * least from the toplevel (e.g. "remotes/origin/master");
624 * otherwise "git push $URL master" would result in
625 * ambiguity between remotes/origin/master and heads/master
626 * at the remote site.
627 */
628 if (namelen != patlen &&
629 patlen != namelen - 5 &&
630 prefixcmp(name, "refs/heads/") &&
631 prefixcmp(name, "refs/tags/")) {
632 /* We want to catch the case where only weak
633 * matches are found and there are multiple
634 * matches, and where more than one strong
635 * matches are found, as ambiguous. One
636 * strong match with zero or more weak matches
637 * are acceptable as a unique match.
638 */
639 matched_weak = refs;
640 weak_match++;
641 }
642 else {
643 matched = refs;
644 match++;
645 }
646 }
647 if (!matched) {
648 *matched_ref = matched_weak;
649 return weak_match;
650 }
651 else {
652 *matched_ref = matched;
653 return match;
654 }
655}
656static void tail_link_ref(struct ref *ref, struct ref ***tail)
658{
659 **tail = ref;
660 while (ref->next)
661 ref = ref->next;
662 *tail = &ref->next;
663}
664static struct ref *try_explicit_object_name(const char *name)
666{
667 unsigned char sha1[20];
668 struct ref *ref;
669 int len;
670 if (!*name) {
672 ref = alloc_ref(20);
673 strcpy(ref->name, "(delete)");
674 hashclr(ref->new_sha1);
675 return ref;
676 }
677 if (get_sha1(name, sha1))
678 return NULL;
679 len = strlen(name) + 1;
680 ref = alloc_ref(len);
681 memcpy(ref->name, name, len);
682 hashcpy(ref->new_sha1, sha1);
683 return ref;
684}
685static struct ref *make_linked_ref(const char *name, struct ref ***tail)
687{
688 struct ref *ret;
689 size_t len;
690 len = strlen(name) + 1;
692 ret = alloc_ref(len);
693 memcpy(ret->name, name, len);
694 tail_link_ref(ret, tail);
695 return ret;
696}
697static int match_explicit(struct ref *src, struct ref *dst,
699 struct ref ***dst_tail,
700 struct refspec *rs,
701 int errs)
702{
703 struct ref *matched_src, *matched_dst;
704 const char *dst_value = rs->dst;
706 if (rs->pattern)
708 return errs;
709 matched_src = matched_dst = NULL;
711 switch (count_refspec_match(rs->src, src, &matched_src)) {
712 case 1:
713 break;
714 case 0:
715 /* The source could be in the get_sha1() format
716 * not a reference name. :refs/other is a
717 * way to delete 'other' ref at the remote end.
718 */
719 matched_src = try_explicit_object_name(rs->src);
720 if (!matched_src)
721 error("src refspec %s does not match any.", rs->src);
722 break;
723 default:
724 matched_src = NULL;
725 error("src refspec %s matches more than one.", rs->src);
726 break;
727 }
728 if (!matched_src)
730 errs = 1;
731 if (!dst_value) {
733 unsigned char sha1[20];
734 int flag;
735 if (!matched_src)
737 return errs;
738 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
739 if (!dst_value ||
740 ((flag & REF_ISSYMREF) &&
741 prefixcmp(dst_value, "refs/heads/")))
742 die("%s cannot be resolved to branch.",
743 matched_src->name);
744 }
745 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
747 case 1:
748 break;
749 case 0:
750 if (!memcmp(dst_value, "refs/", 5))
751 matched_dst = make_linked_ref(dst_value, dst_tail);
752 else
753 error("dst refspec %s does not match any "
754 "existing ref on the remote and does "
755 "not start with refs/.", dst_value);
756 break;
757 default:
758 matched_dst = NULL;
759 error("dst refspec %s matches more than one.",
760 dst_value);
761 break;
762 }
763 if (errs || !matched_dst)
764 return 1;
765 if (matched_dst->peer_ref) {
766 errs = 1;
767 error("dst ref %s receives from more than one src.",
768 matched_dst->name);
769 }
770 else {
771 matched_dst->peer_ref = matched_src;
772 matched_dst->force = rs->force;
773 }
774 return errs;
775}
776static int match_explicit_refs(struct ref *src, struct ref *dst,
778 struct ref ***dst_tail, struct refspec *rs,
779 int rs_nr)
780{
781 int i, errs;
782 for (i = errs = 0; i < rs_nr; i++)
783 errs |= match_explicit(src, dst, dst_tail, &rs[i], errs);
784 return -errs;
785}
786static const struct refspec *check_pattern_match(const struct refspec *rs,
788 int rs_nr,
789 const struct ref *src)
790{
791 int i;
792 for (i = 0; i < rs_nr; i++) {
793 if (rs[i].pattern && !prefixcmp(src->name, rs[i].src))
794 return rs + i;
795 }
796 return NULL;
797}
798/*
800 * Note. This is used only by "push"; refspec matching rules for
801 * push and fetch are subtly different, so do not try to reuse it
802 * without thinking.
803 */
804int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
805 int nr_refspec, const char **refspec, int flags)
806{
807 struct refspec *rs =
808 parse_ref_spec(nr_refspec, (const char **) refspec);
809 int send_all = flags & MATCH_REFS_ALL;
810 int send_mirror = flags & MATCH_REFS_MIRROR;
811 if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
813 return -1;
814 /* pick the remainder */
816 for ( ; src; src = src->next) {
817 struct ref *dst_peer;
818 const struct refspec *pat = NULL;
819 char *dst_name;
820 if (src->peer_ref)
821 continue;
822 if (nr_refspec) {
823 pat = check_pattern_match(rs, nr_refspec, src);
824 if (!pat)
825 continue;
826 }
827 else if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
828 /*
829 * "matching refs"; traditionally we pushed everything
830 * including refs outside refs/heads/ hierarchy, but
831 * that does not make much sense these days.
832 */
833 continue;
834 if (pat) {
836 const char *dst_side = pat->dst ? pat->dst : pat->src;
837 dst_name = xmalloc(strlen(dst_side) +
838 strlen(src->name) -
839 strlen(pat->src) + 2);
840 strcpy(dst_name, dst_side);
841 strcat(dst_name, src->name + strlen(pat->src));
842 } else
843 dst_name = xstrdup(src->name);
844 dst_peer = find_ref_by_name(dst, dst_name);
845 if (dst_peer && dst_peer->peer_ref)
846 /* We're already sending something to this ref. */
847 goto free_name;
848 if (!dst_peer && !nr_refspec && !(send_all || send_mirror))
850 /*
851 * Remote doesn't have it, and we have no
852 * explicit pattern, and we don't have
853 * --all nor --mirror.
854 */
855 goto free_name;
856 if (!dst_peer) {
857 /* Create a new one and link it */
858 dst_peer = make_linked_ref(dst_name, dst_tail);
859 hashcpy(dst_peer->new_sha1, src->new_sha1);
860 }
861 dst_peer->peer_ref = src;
862 if (pat)
863 dst_peer->force = pat->force;
864 free_name:
865 free(dst_name);
866 }
867 return 0;
868}
869struct branch *branch_get(const char *name)
871{
872 struct branch *ret;
873 read_config();
875 if (!name || !*name || !strcmp(name, "HEAD"))
876 ret = current_branch;
877 else
878 ret = make_branch(name, 0);
879 if (ret && ret->remote_name) {
880 ret->remote = remote_get(ret->remote_name);
881 if (ret->merge_nr) {
882 int i;
883 ret->merge = xcalloc(sizeof(*ret->merge),
884 ret->merge_nr);
885 for (i = 0; i < ret->merge_nr; i++) {
886 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
887 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
888 remote_find_tracking(ret->remote,
889 ret->merge[i]);
890 }
891 }
892 }
893 return ret;
894}
895int branch_has_merge_config(struct branch *branch)
897{
898 return branch && !!branch->merge;
899}
900int branch_merge_matches(struct branch *branch,
902 int i,
903 const char *refname)
904{
905 if (!branch || i < 0 || i >= branch->merge_nr)
906 return 0;
907 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
908}
909static struct ref *get_expanded_map(const struct ref *remote_refs,
911 const struct refspec *refspec)
912{
913 const struct ref *ref;
914 struct ref *ret = NULL;
915 struct ref **tail = &ret;
916 int remote_prefix_len = strlen(refspec->src);
918 int local_prefix_len = strlen(refspec->dst);
919 for (ref = remote_refs; ref; ref = ref->next) {
921 if (strchr(ref->name, '^'))
922 continue; /* a dereference item */
923 if (!prefixcmp(ref->name, refspec->src)) {
924 const char *match;
925 struct ref *cpy = copy_ref(ref);
926 match = ref->name + remote_prefix_len;
927 cpy->peer_ref = alloc_ref(local_prefix_len +
929 strlen(match) + 1);
930 sprintf(cpy->peer_ref->name, "%s%s",
931 refspec->dst, match);
932 if (refspec->force)
933 cpy->peer_ref->force = 1;
934 *tail = cpy;
935 tail = &cpy->next;
936 }
937 }
938 return ret;
940}
941static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
943{
944 const struct ref *ref;
945 for (ref = refs; ref; ref = ref->next) {
946 if (refname_match(name, ref->name, ref_fetch_rules))
947 return ref;
948 }
949 return NULL;
950}
951struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
953{
954 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
955 if (!ref)
957 return NULL;
958 return copy_ref(ref);
960}
961static struct ref *get_local_ref(const char *name)
963{
964 struct ref *ret;
965 if (!name)
966 return NULL;
967 if (!prefixcmp(name, "refs/")) {
969 ret = alloc_ref(strlen(name) + 1);
970 strcpy(ret->name, name);
971 return ret;
972 }
973 if (!prefixcmp(name, "heads/") ||
975 !prefixcmp(name, "tags/") ||
976 !prefixcmp(name, "remotes/")) {
977 ret = alloc_ref(strlen(name) + 6);
978 sprintf(ret->name, "refs/%s", name);
979 return ret;
980 }
981 ret = alloc_ref(strlen(name) + 12);
983 sprintf(ret->name, "refs/heads/%s", name);
984 return ret;
985}
986int get_fetch_map(const struct ref *remote_refs,
988 const struct refspec *refspec,
989 struct ref ***tail,
990 int missing_ok)
991{
992 struct ref *ref_map, *rm;
993 if (refspec->pattern) {
995 ref_map = get_expanded_map(remote_refs, refspec);
996 } else {
997 const char *name = refspec->src[0] ? refspec->src : "HEAD";
998 ref_map = get_remote_ref(remote_refs, name);
1000 if (!missing_ok && !ref_map)
1001 die("Couldn't find remote ref %s", name);
1002 if (ref_map) {
1003 ref_map->peer_ref = get_local_ref(refspec->dst);
1004 if (ref_map->peer_ref && refspec->force)
1005 ref_map->peer_ref->force = 1;
1006 }
1007 }
1008 for (rm = ref_map; rm; rm = rm->next) {
1010 if (rm->peer_ref && check_ref_format(rm->peer_ref->name + 5))
1011 die("* refusing to create funny ref '%s' locally",
1012 rm->peer_ref->name);
1013 }
1014 if (ref_map)
1016 tail_link_ref(ref_map, tail);
1017 return 0;
1019}