Provide git_config with a callback-data parameter
[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, void *cb)
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 (!strcmp(subkey, ".mirror"))
341 remote->mirror = git_config_bool(key, value);
342 else if (!strcmp(subkey, ".skipdefaultupdate"))
343 remote->skip_default_update = git_config_bool(key, value);
344
345 else if (!strcmp(subkey, ".url")) {
346 const char *v;
347 if (git_config_string(&v, key, value))
348 return -1;
349 add_url(remote, v);
350 } else if (!strcmp(subkey, ".push")) {
351 const char *v;
352 if (git_config_string(&v, key, value))
353 return -1;
354 add_push_refspec(remote, v);
355 } else if (!strcmp(subkey, ".fetch")) {
356 const char *v;
357 if (git_config_string(&v, key, value))
358 return -1;
359 add_fetch_refspec(remote, v);
360 } else if (!strcmp(subkey, ".receivepack")) {
361 const char *v;
362 if (git_config_string(&v, key, value))
363 return -1;
364 if (!remote->receivepack)
365 remote->receivepack = v;
366 else
367 error("more than one receivepack given, using the first");
368 } else if (!strcmp(subkey, ".uploadpack")) {
369 const char *v;
370 if (git_config_string(&v, key, value))
371 return -1;
372 if (!remote->uploadpack)
373 remote->uploadpack = v;
374 else
375 error("more than one uploadpack given, using the first");
376 } else if (!strcmp(subkey, ".tagopt")) {
377 if (!strcmp(value, "--no-tags"))
378 remote->fetch_tags = -1;
379 } else if (!strcmp(subkey, ".proxy")) {
380 return git_config_string((const char **)&remote->http_proxy,
381 key, value);
382 }
383 return 0;
384 }
385
386 static void alias_all_urls(void)
387 {
388 int i, j;
389 for (i = 0; i < remotes_nr; i++) {
390 if (!remotes[i])
391 continue;
392 for (j = 0; j < remotes[i]->url_nr; j++) {
393 remotes[i]->url[j] = alias_url(remotes[i]->url[j]);
394 }
395 }
396 }
397
398 static void read_config(void)
399 {
400 unsigned char sha1[20];
401 const char *head_ref;
402 int flag;
403 if (default_remote_name) // did this already
404 return;
405 default_remote_name = xstrdup("origin");
406 current_branch = NULL;
407 head_ref = resolve_ref("HEAD", sha1, 0, &flag);
408 if (head_ref && (flag & REF_ISSYMREF) &&
409 !prefixcmp(head_ref, "refs/heads/")) {
410 current_branch =
411 make_branch(head_ref + strlen("refs/heads/"), 0);
412 }
413 git_config(handle_config, NULL);
414 alias_all_urls();
415 }
416
417 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
418 {
419 int i;
420 int st;
421 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
422
423 for (i = 0; i < nr_refspec; i++) {
424 size_t llen, rlen;
425 int is_glob;
426 const char *lhs, *rhs;
427
428 llen = rlen = is_glob = 0;
429
430 lhs = refspec[i];
431 if (*lhs == '+') {
432 rs[i].force = 1;
433 lhs++;
434 }
435
436 rhs = strrchr(lhs, ':');
437 if (rhs) {
438 rhs++;
439 rlen = strlen(rhs);
440 is_glob = (2 <= rlen && !strcmp(rhs + rlen - 2, "/*"));
441 if (is_glob)
442 rlen -= 2;
443 rs[i].dst = xstrndup(rhs, rlen);
444 }
445
446 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
447 if (2 <= llen && !memcmp(lhs + llen - 2, "/*", 2)) {
448 if ((rhs && !is_glob) || (!rhs && fetch))
449 goto invalid;
450 is_glob = 1;
451 llen -= 2;
452 } else if (rhs && is_glob) {
453 goto invalid;
454 }
455
456 rs[i].pattern = is_glob;
457 rs[i].src = xstrndup(lhs, llen);
458
459 if (fetch) {
460 /*
461 * LHS
462 * - empty is allowed; it means HEAD.
463 * - otherwise it must be a valid looking ref.
464 */
465 if (!*rs[i].src)
466 ; /* empty is ok */
467 else {
468 st = check_ref_format(rs[i].src);
469 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
470 goto invalid;
471 }
472 /*
473 * RHS
474 * - missing is ok, and is same as empty.
475 * - empty is ok; it means not to store.
476 * - otherwise it must be a valid looking ref.
477 */
478 if (!rs[i].dst) {
479 ; /* ok */
480 } else if (!*rs[i].dst) {
481 ; /* ok */
482 } else {
483 st = check_ref_format(rs[i].dst);
484 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
485 goto invalid;
486 }
487 } else {
488 /*
489 * LHS
490 * - empty is allowed; it means delete.
491 * - when wildcarded, it must be a valid looking ref.
492 * - otherwise, it must be an extended SHA-1, but
493 * there is no existing way to validate this.
494 */
495 if (!*rs[i].src)
496 ; /* empty is ok */
497 else if (is_glob) {
498 st = check_ref_format(rs[i].src);
499 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
500 goto invalid;
501 }
502 else
503 ; /* anything goes, for now */
504 /*
505 * RHS
506 * - missing is allowed, but LHS then must be a
507 * valid looking ref.
508 * - empty is not allowed.
509 * - otherwise it must be a valid looking ref.
510 */
511 if (!rs[i].dst) {
512 st = check_ref_format(rs[i].src);
513 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
514 goto invalid;
515 } else if (!*rs[i].dst) {
516 goto invalid;
517 } else {
518 st = check_ref_format(rs[i].dst);
519 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
520 goto invalid;
521 }
522 }
523 }
524 return rs;
525
526 invalid:
527 if (verify) {
528 free(rs);
529 return NULL;
530 }
531 die("Invalid refspec '%s'", refspec[i]);
532 }
533
534 int valid_fetch_refspec(const char *fetch_refspec_str)
535 {
536 const char *fetch_refspec[] = { fetch_refspec_str };
537 struct refspec *refspec;
538
539 refspec = parse_refspec_internal(1, fetch_refspec, 1, 1);
540 if (refspec)
541 free(refspec);
542 return !!refspec;
543 }
544
545 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
546 {
547 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
548 }
549
550 struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
551 {
552 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
553 }
554
555 static int valid_remote_nick(const char *name)
556 {
557 if (!name[0] || /* not empty */
558 (name[0] == '.' && /* not "." */
559 (!name[1] || /* not ".." */
560 (name[1] == '.' && !name[2]))))
561 return 0;
562 return !strchr(name, '/'); /* no slash */
563 }
564
565 struct remote *remote_get(const char *name)
566 {
567 struct remote *ret;
568
569 read_config();
570 if (!name)
571 name = default_remote_name;
572 ret = make_remote(name, 0);
573 if (valid_remote_nick(name)) {
574 if (!ret->url)
575 read_remotes_file(ret);
576 if (!ret->url)
577 read_branches_file(ret);
578 }
579 if (!ret->url)
580 add_url_alias(ret, name);
581 if (!ret->url)
582 return NULL;
583 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
584 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
585 return ret;
586 }
587
588 int for_each_remote(each_remote_fn fn, void *priv)
589 {
590 int i, result = 0;
591 read_config();
592 for (i = 0; i < remotes_nr && !result; i++) {
593 struct remote *r = remotes[i];
594 if (!r)
595 continue;
596 if (!r->fetch)
597 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
598 r->fetch_refspec);
599 if (!r->push)
600 r->push = parse_push_refspec(r->push_refspec_nr,
601 r->push_refspec);
602 result = fn(r, priv);
603 }
604 return result;
605 }
606
607 void ref_remove_duplicates(struct ref *ref_map)
608 {
609 struct ref **posn;
610 struct ref *next;
611 for (; ref_map; ref_map = ref_map->next) {
612 if (!ref_map->peer_ref)
613 continue;
614 posn = &ref_map->next;
615 while (*posn) {
616 if ((*posn)->peer_ref &&
617 !strcmp((*posn)->peer_ref->name,
618 ref_map->peer_ref->name)) {
619 if (strcmp((*posn)->name, ref_map->name))
620 die("%s tracks both %s and %s",
621 ref_map->peer_ref->name,
622 (*posn)->name, ref_map->name);
623 next = (*posn)->next;
624 free((*posn)->peer_ref);
625 free(*posn);
626 *posn = next;
627 } else {
628 posn = &(*posn)->next;
629 }
630 }
631 }
632 }
633
634 int remote_has_url(struct remote *remote, const char *url)
635 {
636 int i;
637 for (i = 0; i < remote->url_nr; i++) {
638 if (!strcmp(remote->url[i], url))
639 return 1;
640 }
641 return 0;
642 }
643
644 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
645 {
646 int find_src = refspec->src == NULL;
647 char *needle, **result;
648 int i;
649
650 if (find_src) {
651 if (!refspec->dst)
652 return error("find_tracking: need either src or dst");
653 needle = refspec->dst;
654 result = &refspec->src;
655 } else {
656 needle = refspec->src;
657 result = &refspec->dst;
658 }
659
660 for (i = 0; i < remote->fetch_refspec_nr; i++) {
661 struct refspec *fetch = &remote->fetch[i];
662 const char *key = find_src ? fetch->dst : fetch->src;
663 const char *value = find_src ? fetch->src : fetch->dst;
664 if (!fetch->dst)
665 continue;
666 if (fetch->pattern) {
667 if (!prefixcmp(needle, key) &&
668 needle[strlen(key)] == '/') {
669 *result = xmalloc(strlen(value) +
670 strlen(needle) -
671 strlen(key) + 1);
672 strcpy(*result, value);
673 strcpy(*result + strlen(value),
674 needle + strlen(key));
675 refspec->force = fetch->force;
676 return 0;
677 }
678 } else if (!strcmp(needle, key)) {
679 *result = xstrdup(value);
680 refspec->force = fetch->force;
681 return 0;
682 }
683 }
684 return -1;
685 }
686
687 struct ref *alloc_ref(unsigned namelen)
688 {
689 struct ref *ret = xmalloc(sizeof(struct ref) + namelen);
690 memset(ret, 0, sizeof(struct ref) + namelen);
691 return ret;
692 }
693
694 struct ref *alloc_ref_from_str(const char* str)
695 {
696 struct ref *ret = alloc_ref(strlen(str) + 1);
697 strcpy(ret->name, str);
698 return ret;
699 }
700
701 static struct ref *copy_ref(const struct ref *ref)
702 {
703 struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
704 memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
705 ret->next = NULL;
706 return ret;
707 }
708
709 struct ref *copy_ref_list(const struct ref *ref)
710 {
711 struct ref *ret = NULL;
712 struct ref **tail = &ret;
713 while (ref) {
714 *tail = copy_ref(ref);
715 ref = ref->next;
716 tail = &((*tail)->next);
717 }
718 return ret;
719 }
720
721 void free_ref(struct ref *ref)
722 {
723 if (!ref)
724 return;
725 free(ref->remote_status);
726 free(ref->symref);
727 free(ref);
728 }
729
730 void free_refs(struct ref *ref)
731 {
732 struct ref *next;
733 while (ref) {
734 next = ref->next;
735 free(ref->peer_ref);
736 free_ref(ref);
737 ref = next;
738 }
739 }
740
741 static int count_refspec_match(const char *pattern,
742 struct ref *refs,
743 struct ref **matched_ref)
744 {
745 int patlen = strlen(pattern);
746 struct ref *matched_weak = NULL;
747 struct ref *matched = NULL;
748 int weak_match = 0;
749 int match = 0;
750
751 for (weak_match = match = 0; refs; refs = refs->next) {
752 char *name = refs->name;
753 int namelen = strlen(name);
754
755 if (!refname_match(pattern, name, ref_rev_parse_rules))
756 continue;
757
758 /* A match is "weak" if it is with refs outside
759 * heads or tags, and did not specify the pattern
760 * in full (e.g. "refs/remotes/origin/master") or at
761 * least from the toplevel (e.g. "remotes/origin/master");
762 * otherwise "git push $URL master" would result in
763 * ambiguity between remotes/origin/master and heads/master
764 * at the remote site.
765 */
766 if (namelen != patlen &&
767 patlen != namelen - 5 &&
768 prefixcmp(name, "refs/heads/") &&
769 prefixcmp(name, "refs/tags/")) {
770 /* We want to catch the case where only weak
771 * matches are found and there are multiple
772 * matches, and where more than one strong
773 * matches are found, as ambiguous. One
774 * strong match with zero or more weak matches
775 * are acceptable as a unique match.
776 */
777 matched_weak = refs;
778 weak_match++;
779 }
780 else {
781 matched = refs;
782 match++;
783 }
784 }
785 if (!matched) {
786 *matched_ref = matched_weak;
787 return weak_match;
788 }
789 else {
790 *matched_ref = matched;
791 return match;
792 }
793 }
794
795 static void tail_link_ref(struct ref *ref, struct ref ***tail)
796 {
797 **tail = ref;
798 while (ref->next)
799 ref = ref->next;
800 *tail = &ref->next;
801 }
802
803 static struct ref *try_explicit_object_name(const char *name)
804 {
805 unsigned char sha1[20];
806 struct ref *ref;
807
808 if (!*name) {
809 ref = alloc_ref(20);
810 strcpy(ref->name, "(delete)");
811 hashclr(ref->new_sha1);
812 return ref;
813 }
814 if (get_sha1(name, sha1))
815 return NULL;
816 ref = alloc_ref_from_str(name);
817 hashcpy(ref->new_sha1, sha1);
818 return ref;
819 }
820
821 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
822 {
823 struct ref *ret = alloc_ref_from_str(name);
824 tail_link_ref(ret, tail);
825 return ret;
826 }
827
828 static char *guess_ref(const char *name, struct ref *peer)
829 {
830 struct strbuf buf = STRBUF_INIT;
831 unsigned char sha1[20];
832
833 const char *r = resolve_ref(peer->name, sha1, 1, NULL);
834 if (!r)
835 return NULL;
836
837 if (!prefixcmp(r, "refs/heads/"))
838 strbuf_addstr(&buf, "refs/heads/");
839 else if (!prefixcmp(r, "refs/tags/"))
840 strbuf_addstr(&buf, "refs/tags/");
841 else
842 return NULL;
843
844 strbuf_addstr(&buf, name);
845 return strbuf_detach(&buf, NULL);
846 }
847
848 static int match_explicit(struct ref *src, struct ref *dst,
849 struct ref ***dst_tail,
850 struct refspec *rs,
851 int errs)
852 {
853 struct ref *matched_src, *matched_dst;
854
855 const char *dst_value = rs->dst;
856 char *dst_guess;
857
858 if (rs->pattern)
859 return errs;
860
861 matched_src = matched_dst = NULL;
862 switch (count_refspec_match(rs->src, src, &matched_src)) {
863 case 1:
864 break;
865 case 0:
866 /* The source could be in the get_sha1() format
867 * not a reference name. :refs/other is a
868 * way to delete 'other' ref at the remote end.
869 */
870 matched_src = try_explicit_object_name(rs->src);
871 if (!matched_src)
872 error("src refspec %s does not match any.", rs->src);
873 break;
874 default:
875 matched_src = NULL;
876 error("src refspec %s matches more than one.", rs->src);
877 break;
878 }
879
880 if (!matched_src)
881 errs = 1;
882
883 if (!dst_value) {
884 unsigned char sha1[20];
885 int flag;
886
887 if (!matched_src)
888 return errs;
889 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
890 if (!dst_value ||
891 ((flag & REF_ISSYMREF) &&
892 prefixcmp(dst_value, "refs/heads/")))
893 die("%s cannot be resolved to branch.",
894 matched_src->name);
895 }
896
897 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
898 case 1:
899 break;
900 case 0:
901 if (!memcmp(dst_value, "refs/", 5))
902 matched_dst = make_linked_ref(dst_value, dst_tail);
903 else if((dst_guess = guess_ref(dst_value, matched_src)))
904 matched_dst = make_linked_ref(dst_guess, dst_tail);
905 else
906 error("unable to push to unqualified destination: %s\n"
907 "The destination refspec neither matches an "
908 "existing ref on the remote nor\n"
909 "begins with refs/, and we are unable to "
910 "guess a prefix based on the source ref.",
911 dst_value);
912 break;
913 default:
914 matched_dst = NULL;
915 error("dst refspec %s matches more than one.",
916 dst_value);
917 break;
918 }
919 if (errs || !matched_dst)
920 return 1;
921 if (matched_dst->peer_ref) {
922 errs = 1;
923 error("dst ref %s receives from more than one src.",
924 matched_dst->name);
925 }
926 else {
927 matched_dst->peer_ref = matched_src;
928 matched_dst->force = rs->force;
929 }
930 return errs;
931 }
932
933 static int match_explicit_refs(struct ref *src, struct ref *dst,
934 struct ref ***dst_tail, struct refspec *rs,
935 int rs_nr)
936 {
937 int i, errs;
938 for (i = errs = 0; i < rs_nr; i++)
939 errs |= match_explicit(src, dst, dst_tail, &rs[i], errs);
940 return -errs;
941 }
942
943 static const struct refspec *check_pattern_match(const struct refspec *rs,
944 int rs_nr,
945 const struct ref *src)
946 {
947 int i;
948 for (i = 0; i < rs_nr; i++) {
949 if (rs[i].pattern &&
950 !prefixcmp(src->name, rs[i].src) &&
951 src->name[strlen(rs[i].src)] == '/')
952 return rs + i;
953 }
954 return NULL;
955 }
956
957 /*
958 * Note. This is used only by "push"; refspec matching rules for
959 * push and fetch are subtly different, so do not try to reuse it
960 * without thinking.
961 */
962 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
963 int nr_refspec, const char **refspec, int flags)
964 {
965 struct refspec *rs =
966 parse_push_refspec(nr_refspec, (const char **) refspec);
967 int send_all = flags & MATCH_REFS_ALL;
968 int send_mirror = flags & MATCH_REFS_MIRROR;
969
970 if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
971 return -1;
972
973 /* pick the remainder */
974 for ( ; src; src = src->next) {
975 struct ref *dst_peer;
976 const struct refspec *pat = NULL;
977 char *dst_name;
978 if (src->peer_ref)
979 continue;
980 if (nr_refspec) {
981 pat = check_pattern_match(rs, nr_refspec, src);
982 if (!pat)
983 continue;
984 }
985 else if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
986 /*
987 * "matching refs"; traditionally we pushed everything
988 * including refs outside refs/heads/ hierarchy, but
989 * that does not make much sense these days.
990 */
991 continue;
992
993 if (pat) {
994 const char *dst_side = pat->dst ? pat->dst : pat->src;
995 dst_name = xmalloc(strlen(dst_side) +
996 strlen(src->name) -
997 strlen(pat->src) + 2);
998 strcpy(dst_name, dst_side);
999 strcat(dst_name, src->name + strlen(pat->src));
1000 } else
1001 dst_name = xstrdup(src->name);
1002 dst_peer = find_ref_by_name(dst, dst_name);
1003 if (dst_peer && dst_peer->peer_ref)
1004 /* We're already sending something to this ref. */
1005 goto free_name;
1006
1007 if (!dst_peer && !nr_refspec && !(send_all || send_mirror))
1008 /*
1009 * Remote doesn't have it, and we have no
1010 * explicit pattern, and we don't have
1011 * --all nor --mirror.
1012 */
1013 goto free_name;
1014 if (!dst_peer) {
1015 /* Create a new one and link it */
1016 dst_peer = make_linked_ref(dst_name, dst_tail);
1017 hashcpy(dst_peer->new_sha1, src->new_sha1);
1018 }
1019 dst_peer->peer_ref = src;
1020 if (pat)
1021 dst_peer->force = pat->force;
1022 free_name:
1023 free(dst_name);
1024 }
1025 return 0;
1026 }
1027
1028 struct branch *branch_get(const char *name)
1029 {
1030 struct branch *ret;
1031
1032 read_config();
1033 if (!name || !*name || !strcmp(name, "HEAD"))
1034 ret = current_branch;
1035 else
1036 ret = make_branch(name, 0);
1037 if (ret && ret->remote_name) {
1038 ret->remote = remote_get(ret->remote_name);
1039 if (ret->merge_nr) {
1040 int i;
1041 ret->merge = xcalloc(sizeof(*ret->merge),
1042 ret->merge_nr);
1043 for (i = 0; i < ret->merge_nr; i++) {
1044 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1045 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1046 remote_find_tracking(ret->remote,
1047 ret->merge[i]);
1048 }
1049 }
1050 }
1051 return ret;
1052 }
1053
1054 int branch_has_merge_config(struct branch *branch)
1055 {
1056 return branch && !!branch->merge;
1057 }
1058
1059 int branch_merge_matches(struct branch *branch,
1060 int i,
1061 const char *refname)
1062 {
1063 if (!branch || i < 0 || i >= branch->merge_nr)
1064 return 0;
1065 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1066 }
1067
1068 static struct ref *get_expanded_map(const struct ref *remote_refs,
1069 const struct refspec *refspec)
1070 {
1071 const struct ref *ref;
1072 struct ref *ret = NULL;
1073 struct ref **tail = &ret;
1074
1075 int remote_prefix_len = strlen(refspec->src);
1076 int local_prefix_len = strlen(refspec->dst);
1077
1078 for (ref = remote_refs; ref; ref = ref->next) {
1079 if (strchr(ref->name, '^'))
1080 continue; /* a dereference item */
1081 if (!prefixcmp(ref->name, refspec->src)) {
1082 const char *match;
1083 struct ref *cpy = copy_ref(ref);
1084 match = ref->name + remote_prefix_len;
1085
1086 cpy->peer_ref = alloc_ref(local_prefix_len +
1087 strlen(match) + 1);
1088 sprintf(cpy->peer_ref->name, "%s%s",
1089 refspec->dst, match);
1090 if (refspec->force)
1091 cpy->peer_ref->force = 1;
1092 *tail = cpy;
1093 tail = &cpy->next;
1094 }
1095 }
1096
1097 return ret;
1098 }
1099
1100 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1101 {
1102 const struct ref *ref;
1103 for (ref = refs; ref; ref = ref->next) {
1104 if (refname_match(name, ref->name, ref_fetch_rules))
1105 return ref;
1106 }
1107 return NULL;
1108 }
1109
1110 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1111 {
1112 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1113
1114 if (!ref)
1115 return NULL;
1116
1117 return copy_ref(ref);
1118 }
1119
1120 static struct ref *get_local_ref(const char *name)
1121 {
1122 struct ref *ret;
1123 if (!name)
1124 return NULL;
1125
1126 if (!prefixcmp(name, "refs/")) {
1127 return alloc_ref_from_str(name);
1128 }
1129
1130 if (!prefixcmp(name, "heads/") ||
1131 !prefixcmp(name, "tags/") ||
1132 !prefixcmp(name, "remotes/")) {
1133 ret = alloc_ref(strlen(name) + 6);
1134 sprintf(ret->name, "refs/%s", name);
1135 return ret;
1136 }
1137
1138 ret = alloc_ref(strlen(name) + 12);
1139 sprintf(ret->name, "refs/heads/%s", name);
1140 return ret;
1141 }
1142
1143 int get_fetch_map(const struct ref *remote_refs,
1144 const struct refspec *refspec,
1145 struct ref ***tail,
1146 int missing_ok)
1147 {
1148 struct ref *ref_map, **rmp;
1149
1150 if (refspec->pattern) {
1151 ref_map = get_expanded_map(remote_refs, refspec);
1152 } else {
1153 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1154
1155 ref_map = get_remote_ref(remote_refs, name);
1156 if (!missing_ok && !ref_map)
1157 die("Couldn't find remote ref %s", name);
1158 if (ref_map) {
1159 ref_map->peer_ref = get_local_ref(refspec->dst);
1160 if (ref_map->peer_ref && refspec->force)
1161 ref_map->peer_ref->force = 1;
1162 }
1163 }
1164
1165 for (rmp = &ref_map; *rmp; ) {
1166 if ((*rmp)->peer_ref) {
1167 int st = check_ref_format((*rmp)->peer_ref->name + 5);
1168 if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
1169 struct ref *ignore = *rmp;
1170 error("* Ignoring funny ref '%s' locally",
1171 (*rmp)->peer_ref->name);
1172 *rmp = (*rmp)->next;
1173 free(ignore->peer_ref);
1174 free(ignore);
1175 continue;
1176 }
1177 }
1178 rmp = &((*rmp)->next);
1179 }
1180
1181 if (ref_map)
1182 tail_link_ref(ref_map, tail);
1183
1184 return 0;
1185 }
1186
1187 int resolve_remote_symref(struct ref *ref, struct ref *list)
1188 {
1189 if (!ref->symref)
1190 return 0;
1191 for (; list; list = list->next)
1192 if (!strcmp(ref->symref, list->name)) {
1193 hashcpy(ref->old_sha1, list->old_sha1);
1194 return 0;
1195 }
1196 return 1;
1197 }