Make git-add behave more sensibly in a case-insensitive environment
[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 + 5;
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)
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 die("Invalid refspec '%s'", refspec[i]);
523 }
524
525 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
526 {
527 return parse_refspec_internal(nr_refspec, refspec, 1);
528 }
529
530 struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
531 {
532 return parse_refspec_internal(nr_refspec, refspec, 0);
533 }
534
535 static int valid_remote_nick(const char *name)
536 {
537 if (!name[0] || /* not empty */
538 (name[0] == '.' && /* not "." */
539 (!name[1] || /* not ".." */
540 (name[1] == '.' && !name[2]))))
541 return 0;
542 return !strchr(name, '/'); /* no slash */
543 }
544
545 struct remote *remote_get(const char *name)
546 {
547 struct remote *ret;
548
549 read_config();
550 if (!name)
551 name = default_remote_name;
552 ret = make_remote(name, 0);
553 if (valid_remote_nick(name)) {
554 if (!ret->url)
555 read_remotes_file(ret);
556 if (!ret->url)
557 read_branches_file(ret);
558 }
559 if (!ret->url)
560 add_url_alias(ret, name);
561 if (!ret->url)
562 return NULL;
563 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
564 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
565 return ret;
566 }
567
568 int for_each_remote(each_remote_fn fn, void *priv)
569 {
570 int i, result = 0;
571 read_config();
572 for (i = 0; i < remotes_nr && !result; i++) {
573 struct remote *r = remotes[i];
574 if (!r)
575 continue;
576 if (!r->fetch)
577 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
578 r->fetch_refspec);
579 if (!r->push)
580 r->push = parse_push_refspec(r->push_refspec_nr,
581 r->push_refspec);
582 result = fn(r, priv);
583 }
584 return result;
585 }
586
587 void ref_remove_duplicates(struct ref *ref_map)
588 {
589 struct ref **posn;
590 struct ref *next;
591 for (; ref_map; ref_map = ref_map->next) {
592 if (!ref_map->peer_ref)
593 continue;
594 posn = &ref_map->next;
595 while (*posn) {
596 if ((*posn)->peer_ref &&
597 !strcmp((*posn)->peer_ref->name,
598 ref_map->peer_ref->name)) {
599 if (strcmp((*posn)->name, ref_map->name))
600 die("%s tracks both %s and %s",
601 ref_map->peer_ref->name,
602 (*posn)->name, ref_map->name);
603 next = (*posn)->next;
604 free((*posn)->peer_ref);
605 free(*posn);
606 *posn = next;
607 } else {
608 posn = &(*posn)->next;
609 }
610 }
611 }
612 }
613
614 int remote_has_url(struct remote *remote, const char *url)
615 {
616 int i;
617 for (i = 0; i < remote->url_nr; i++) {
618 if (!strcmp(remote->url[i], url))
619 return 1;
620 }
621 return 0;
622 }
623
624 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
625 {
626 int find_src = refspec->src == NULL;
627 char *needle, **result;
628 int i;
629
630 if (find_src) {
631 if (!refspec->dst)
632 return error("find_tracking: need either src or dst");
633 needle = refspec->dst;
634 result = &refspec->src;
635 } else {
636 needle = refspec->src;
637 result = &refspec->dst;
638 }
639
640 for (i = 0; i < remote->fetch_refspec_nr; i++) {
641 struct refspec *fetch = &remote->fetch[i];
642 const char *key = find_src ? fetch->dst : fetch->src;
643 const char *value = find_src ? fetch->src : fetch->dst;
644 if (!fetch->dst)
645 continue;
646 if (fetch->pattern) {
647 if (!prefixcmp(needle, key) &&
648 needle[strlen(key)] == '/') {
649 *result = xmalloc(strlen(value) +
650 strlen(needle) -
651 strlen(key) + 1);
652 strcpy(*result, value);
653 strcpy(*result + strlen(value),
654 needle + strlen(key));
655 refspec->force = fetch->force;
656 return 0;
657 }
658 } else if (!strcmp(needle, key)) {
659 *result = xstrdup(value);
660 refspec->force = fetch->force;
661 return 0;
662 }
663 }
664 return -1;
665 }
666
667 struct ref *alloc_ref(unsigned namelen)
668 {
669 struct ref *ret = xmalloc(sizeof(struct ref) + namelen);
670 memset(ret, 0, sizeof(struct ref) + namelen);
671 return ret;
672 }
673
674 static struct ref *copy_ref(const struct ref *ref)
675 {
676 struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
677 memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
678 ret->next = NULL;
679 return ret;
680 }
681
682 struct ref *copy_ref_list(const struct ref *ref)
683 {
684 struct ref *ret = NULL;
685 struct ref **tail = &ret;
686 while (ref) {
687 *tail = copy_ref(ref);
688 ref = ref->next;
689 tail = &((*tail)->next);
690 }
691 return ret;
692 }
693
694 void free_refs(struct ref *ref)
695 {
696 struct ref *next;
697 while (ref) {
698 next = ref->next;
699 free(ref->peer_ref);
700 free(ref);
701 ref = next;
702 }
703 }
704
705 static int count_refspec_match(const char *pattern,
706 struct ref *refs,
707 struct ref **matched_ref)
708 {
709 int patlen = strlen(pattern);
710 struct ref *matched_weak = NULL;
711 struct ref *matched = NULL;
712 int weak_match = 0;
713 int match = 0;
714
715 for (weak_match = match = 0; refs; refs = refs->next) {
716 char *name = refs->name;
717 int namelen = strlen(name);
718
719 if (!refname_match(pattern, name, ref_rev_parse_rules))
720 continue;
721
722 /* A match is "weak" if it is with refs outside
723 * heads or tags, and did not specify the pattern
724 * in full (e.g. "refs/remotes/origin/master") or at
725 * least from the toplevel (e.g. "remotes/origin/master");
726 * otherwise "git push $URL master" would result in
727 * ambiguity between remotes/origin/master and heads/master
728 * at the remote site.
729 */
730 if (namelen != patlen &&
731 patlen != namelen - 5 &&
732 prefixcmp(name, "refs/heads/") &&
733 prefixcmp(name, "refs/tags/")) {
734 /* We want to catch the case where only weak
735 * matches are found and there are multiple
736 * matches, and where more than one strong
737 * matches are found, as ambiguous. One
738 * strong match with zero or more weak matches
739 * are acceptable as a unique match.
740 */
741 matched_weak = refs;
742 weak_match++;
743 }
744 else {
745 matched = refs;
746 match++;
747 }
748 }
749 if (!matched) {
750 *matched_ref = matched_weak;
751 return weak_match;
752 }
753 else {
754 *matched_ref = matched;
755 return match;
756 }
757 }
758
759 static void tail_link_ref(struct ref *ref, struct ref ***tail)
760 {
761 **tail = ref;
762 while (ref->next)
763 ref = ref->next;
764 *tail = &ref->next;
765 }
766
767 static struct ref *try_explicit_object_name(const char *name)
768 {
769 unsigned char sha1[20];
770 struct ref *ref;
771 int len;
772
773 if (!*name) {
774 ref = alloc_ref(20);
775 strcpy(ref->name, "(delete)");
776 hashclr(ref->new_sha1);
777 return ref;
778 }
779 if (get_sha1(name, sha1))
780 return NULL;
781 len = strlen(name) + 1;
782 ref = alloc_ref(len);
783 memcpy(ref->name, name, len);
784 hashcpy(ref->new_sha1, sha1);
785 return ref;
786 }
787
788 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
789 {
790 struct ref *ret;
791 size_t len;
792
793 len = strlen(name) + 1;
794 ret = alloc_ref(len);
795 memcpy(ret->name, name, len);
796 tail_link_ref(ret, tail);
797 return ret;
798 }
799
800 static int match_explicit(struct ref *src, struct ref *dst,
801 struct ref ***dst_tail,
802 struct refspec *rs,
803 int errs)
804 {
805 struct ref *matched_src, *matched_dst;
806
807 const char *dst_value = rs->dst;
808
809 if (rs->pattern)
810 return errs;
811
812 matched_src = matched_dst = NULL;
813 switch (count_refspec_match(rs->src, src, &matched_src)) {
814 case 1:
815 break;
816 case 0:
817 /* The source could be in the get_sha1() format
818 * not a reference name. :refs/other is a
819 * way to delete 'other' ref at the remote end.
820 */
821 matched_src = try_explicit_object_name(rs->src);
822 if (!matched_src)
823 error("src refspec %s does not match any.", rs->src);
824 break;
825 default:
826 matched_src = NULL;
827 error("src refspec %s matches more than one.", rs->src);
828 break;
829 }
830
831 if (!matched_src)
832 errs = 1;
833
834 if (!dst_value) {
835 unsigned char sha1[20];
836 int flag;
837
838 if (!matched_src)
839 return errs;
840 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
841 if (!dst_value ||
842 ((flag & REF_ISSYMREF) &&
843 prefixcmp(dst_value, "refs/heads/")))
844 die("%s cannot be resolved to branch.",
845 matched_src->name);
846 }
847
848 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
849 case 1:
850 break;
851 case 0:
852 if (!memcmp(dst_value, "refs/", 5))
853 matched_dst = make_linked_ref(dst_value, dst_tail);
854 else
855 error("dst refspec %s does not match any "
856 "existing ref on the remote and does "
857 "not start with refs/.", dst_value);
858 break;
859 default:
860 matched_dst = NULL;
861 error("dst refspec %s matches more than one.",
862 dst_value);
863 break;
864 }
865 if (errs || !matched_dst)
866 return 1;
867 if (matched_dst->peer_ref) {
868 errs = 1;
869 error("dst ref %s receives from more than one src.",
870 matched_dst->name);
871 }
872 else {
873 matched_dst->peer_ref = matched_src;
874 matched_dst->force = rs->force;
875 }
876 return errs;
877 }
878
879 static int match_explicit_refs(struct ref *src, struct ref *dst,
880 struct ref ***dst_tail, struct refspec *rs,
881 int rs_nr)
882 {
883 int i, errs;
884 for (i = errs = 0; i < rs_nr; i++)
885 errs |= match_explicit(src, dst, dst_tail, &rs[i], errs);
886 return -errs;
887 }
888
889 static const struct refspec *check_pattern_match(const struct refspec *rs,
890 int rs_nr,
891 const struct ref *src)
892 {
893 int i;
894 for (i = 0; i < rs_nr; i++) {
895 if (rs[i].pattern &&
896 !prefixcmp(src->name, rs[i].src) &&
897 src->name[strlen(rs[i].src)] == '/')
898 return rs + i;
899 }
900 return NULL;
901 }
902
903 /*
904 * Note. This is used only by "push"; refspec matching rules for
905 * push and fetch are subtly different, so do not try to reuse it
906 * without thinking.
907 */
908 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
909 int nr_refspec, const char **refspec, int flags)
910 {
911 struct refspec *rs =
912 parse_push_refspec(nr_refspec, (const char **) refspec);
913 int send_all = flags & MATCH_REFS_ALL;
914 int send_mirror = flags & MATCH_REFS_MIRROR;
915
916 if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
917 return -1;
918
919 /* pick the remainder */
920 for ( ; src; src = src->next) {
921 struct ref *dst_peer;
922 const struct refspec *pat = NULL;
923 char *dst_name;
924 if (src->peer_ref)
925 continue;
926 if (nr_refspec) {
927 pat = check_pattern_match(rs, nr_refspec, src);
928 if (!pat)
929 continue;
930 }
931 else if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
932 /*
933 * "matching refs"; traditionally we pushed everything
934 * including refs outside refs/heads/ hierarchy, but
935 * that does not make much sense these days.
936 */
937 continue;
938
939 if (pat) {
940 const char *dst_side = pat->dst ? pat->dst : pat->src;
941 dst_name = xmalloc(strlen(dst_side) +
942 strlen(src->name) -
943 strlen(pat->src) + 2);
944 strcpy(dst_name, dst_side);
945 strcat(dst_name, src->name + strlen(pat->src));
946 } else
947 dst_name = xstrdup(src->name);
948 dst_peer = find_ref_by_name(dst, dst_name);
949 if (dst_peer && dst_peer->peer_ref)
950 /* We're already sending something to this ref. */
951 goto free_name;
952
953 if (!dst_peer && !nr_refspec && !(send_all || send_mirror))
954 /*
955 * Remote doesn't have it, and we have no
956 * explicit pattern, and we don't have
957 * --all nor --mirror.
958 */
959 goto free_name;
960 if (!dst_peer) {
961 /* Create a new one and link it */
962 dst_peer = make_linked_ref(dst_name, dst_tail);
963 hashcpy(dst_peer->new_sha1, src->new_sha1);
964 }
965 dst_peer->peer_ref = src;
966 if (pat)
967 dst_peer->force = pat->force;
968 free_name:
969 free(dst_name);
970 }
971 return 0;
972 }
973
974 struct branch *branch_get(const char *name)
975 {
976 struct branch *ret;
977
978 read_config();
979 if (!name || !*name || !strcmp(name, "HEAD"))
980 ret = current_branch;
981 else
982 ret = make_branch(name, 0);
983 if (ret && ret->remote_name) {
984 ret->remote = remote_get(ret->remote_name);
985 if (ret->merge_nr) {
986 int i;
987 ret->merge = xcalloc(sizeof(*ret->merge),
988 ret->merge_nr);
989 for (i = 0; i < ret->merge_nr; i++) {
990 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
991 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
992 remote_find_tracking(ret->remote,
993 ret->merge[i]);
994 }
995 }
996 }
997 return ret;
998 }
999
1000 int branch_has_merge_config(struct branch *branch)
1001 {
1002 return branch && !!branch->merge;
1003 }
1004
1005 int branch_merge_matches(struct branch *branch,
1006 int i,
1007 const char *refname)
1008 {
1009 if (!branch || i < 0 || i >= branch->merge_nr)
1010 return 0;
1011 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1012 }
1013
1014 static struct ref *get_expanded_map(const struct ref *remote_refs,
1015 const struct refspec *refspec)
1016 {
1017 const struct ref *ref;
1018 struct ref *ret = NULL;
1019 struct ref **tail = &ret;
1020
1021 int remote_prefix_len = strlen(refspec->src);
1022 int local_prefix_len = strlen(refspec->dst);
1023
1024 for (ref = remote_refs; ref; ref = ref->next) {
1025 if (strchr(ref->name, '^'))
1026 continue; /* a dereference item */
1027 if (!prefixcmp(ref->name, refspec->src)) {
1028 const char *match;
1029 struct ref *cpy = copy_ref(ref);
1030 match = ref->name + remote_prefix_len;
1031
1032 cpy->peer_ref = alloc_ref(local_prefix_len +
1033 strlen(match) + 1);
1034 sprintf(cpy->peer_ref->name, "%s%s",
1035 refspec->dst, match);
1036 if (refspec->force)
1037 cpy->peer_ref->force = 1;
1038 *tail = cpy;
1039 tail = &cpy->next;
1040 }
1041 }
1042
1043 return ret;
1044 }
1045
1046 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1047 {
1048 const struct ref *ref;
1049 for (ref = refs; ref; ref = ref->next) {
1050 if (refname_match(name, ref->name, ref_fetch_rules))
1051 return ref;
1052 }
1053 return NULL;
1054 }
1055
1056 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1057 {
1058 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1059
1060 if (!ref)
1061 return NULL;
1062
1063 return copy_ref(ref);
1064 }
1065
1066 static struct ref *get_local_ref(const char *name)
1067 {
1068 struct ref *ret;
1069 if (!name)
1070 return NULL;
1071
1072 if (!prefixcmp(name, "refs/")) {
1073 ret = alloc_ref(strlen(name) + 1);
1074 strcpy(ret->name, name);
1075 return ret;
1076 }
1077
1078 if (!prefixcmp(name, "heads/") ||
1079 !prefixcmp(name, "tags/") ||
1080 !prefixcmp(name, "remotes/")) {
1081 ret = alloc_ref(strlen(name) + 6);
1082 sprintf(ret->name, "refs/%s", name);
1083 return ret;
1084 }
1085
1086 ret = alloc_ref(strlen(name) + 12);
1087 sprintf(ret->name, "refs/heads/%s", name);
1088 return ret;
1089 }
1090
1091 int get_fetch_map(const struct ref *remote_refs,
1092 const struct refspec *refspec,
1093 struct ref ***tail,
1094 int missing_ok)
1095 {
1096 struct ref *ref_map, **rmp;
1097
1098 if (refspec->pattern) {
1099 ref_map = get_expanded_map(remote_refs, refspec);
1100 } else {
1101 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1102
1103 ref_map = get_remote_ref(remote_refs, name);
1104 if (!missing_ok && !ref_map)
1105 die("Couldn't find remote ref %s", name);
1106 if (ref_map) {
1107 ref_map->peer_ref = get_local_ref(refspec->dst);
1108 if (ref_map->peer_ref && refspec->force)
1109 ref_map->peer_ref->force = 1;
1110 }
1111 }
1112
1113 for (rmp = &ref_map; *rmp; ) {
1114 if ((*rmp)->peer_ref) {
1115 int st = check_ref_format((*rmp)->peer_ref->name + 5);
1116 if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
1117 struct ref *ignore = *rmp;
1118 error("* Ignoring funny ref '%s' locally",
1119 (*rmp)->peer_ref->name);
1120 *rmp = (*rmp)->next;
1121 free(ignore->peer_ref);
1122 free(ignore);
1123 continue;
1124 }
1125 }
1126 rmp = &((*rmp)->next);
1127 }
1128
1129 if (ref_map)
1130 tail_link_ref(ref_map, tail);
1131
1132 return 0;
1133 }