Merge branch 'maint'
[git/git.git] / remote.c
1 #include "cache.h"
2 #include "remote.h"
3 #include "refs.h"
4 #include "commit.h"
5 #include "diff.h"
6 #include "revision.h"
7 #include "dir.h"
8
9 static struct refspec s_tag_refspec = {
10 0,
11 1,
12 0,
13 "refs/tags/",
14 "refs/tags/"
15 };
16
17 const struct refspec *tag_refspec = &s_tag_refspec;
18
19 struct counted_string {
20 size_t len;
21 const char *s;
22 };
23 struct rewrite {
24 const char *base;
25 size_t baselen;
26 struct counted_string *instead_of;
27 int instead_of_nr;
28 int instead_of_alloc;
29 };
30
31 static struct remote **remotes;
32 static int remotes_alloc;
33 static int remotes_nr;
34
35 static struct branch **branches;
36 static int branches_alloc;
37 static int branches_nr;
38
39 static struct branch *current_branch;
40 static const char *default_remote_name;
41
42 static struct rewrite **rewrite;
43 static int rewrite_alloc;
44 static int rewrite_nr;
45
46 #define BUF_SIZE (2048)
47 static char buffer[BUF_SIZE];
48
49 static const char *alias_url(const char *url)
50 {
51 int i, j;
52 char *ret;
53 struct counted_string *longest;
54 int longest_i;
55
56 longest = NULL;
57 longest_i = -1;
58 for (i = 0; i < rewrite_nr; i++) {
59 if (!rewrite[i])
60 continue;
61 for (j = 0; j < rewrite[i]->instead_of_nr; j++) {
62 if (!prefixcmp(url, rewrite[i]->instead_of[j].s) &&
63 (!longest ||
64 longest->len < rewrite[i]->instead_of[j].len)) {
65 longest = &(rewrite[i]->instead_of[j]);
66 longest_i = i;
67 }
68 }
69 }
70 if (!longest)
71 return url;
72
73 ret = xmalloc(rewrite[longest_i]->baselen +
74 (strlen(url) - longest->len) + 1);
75 strcpy(ret, rewrite[longest_i]->base);
76 strcpy(ret + rewrite[longest_i]->baselen, url + longest->len);
77 return ret;
78 }
79
80 static void add_push_refspec(struct remote *remote, const char *ref)
81 {
82 ALLOC_GROW(remote->push_refspec,
83 remote->push_refspec_nr + 1,
84 remote->push_refspec_alloc);
85 remote->push_refspec[remote->push_refspec_nr++] = ref;
86 }
87
88 static void add_fetch_refspec(struct remote *remote, const char *ref)
89 {
90 ALLOC_GROW(remote->fetch_refspec,
91 remote->fetch_refspec_nr + 1,
92 remote->fetch_refspec_alloc);
93 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
94 }
95
96 static void add_url(struct remote *remote, const char *url)
97 {
98 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
99 remote->url[remote->url_nr++] = url;
100 }
101
102 static void add_url_alias(struct remote *remote, const char *url)
103 {
104 add_url(remote, alias_url(url));
105 }
106
107 static struct remote *make_remote(const char *name, int len)
108 {
109 struct remote *ret;
110 int i;
111
112 for (i = 0; i < remotes_nr; i++) {
113 if (len ? (!strncmp(name, remotes[i]->name, len) &&
114 !remotes[i]->name[len]) :
115 !strcmp(name, remotes[i]->name))
116 return remotes[i];
117 }
118
119 ret = xcalloc(1, sizeof(struct remote));
120 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
121 remotes[remotes_nr++] = ret;
122 if (len)
123 ret->name = xstrndup(name, len);
124 else
125 ret->name = xstrdup(name);
126 return ret;
127 }
128
129 static void add_merge(struct branch *branch, const char *name)
130 {
131 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
132 branch->merge_alloc);
133 branch->merge_name[branch->merge_nr++] = name;
134 }
135
136 static struct branch *make_branch(const char *name, int len)
137 {
138 struct branch *ret;
139 int i;
140 char *refname;
141
142 for (i = 0; i < branches_nr; i++) {
143 if (len ? (!strncmp(name, branches[i]->name, len) &&
144 !branches[i]->name[len]) :
145 !strcmp(name, branches[i]->name))
146 return branches[i];
147 }
148
149 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
150 ret = xcalloc(1, sizeof(struct branch));
151 branches[branches_nr++] = ret;
152 if (len)
153 ret->name = xstrndup(name, len);
154 else
155 ret->name = xstrdup(name);
156 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
157 strcpy(refname, "refs/heads/");
158 strcpy(refname + strlen("refs/heads/"), ret->name);
159 ret->refname = refname;
160
161 return ret;
162 }
163
164 static struct rewrite *make_rewrite(const char *base, int len)
165 {
166 struct rewrite *ret;
167 int i;
168
169 for (i = 0; i < rewrite_nr; i++) {
170 if (len
171 ? (len == rewrite[i]->baselen &&
172 !strncmp(base, rewrite[i]->base, len))
173 : !strcmp(base, rewrite[i]->base))
174 return rewrite[i];
175 }
176
177 ALLOC_GROW(rewrite, rewrite_nr + 1, rewrite_alloc);
178 ret = xcalloc(1, sizeof(struct rewrite));
179 rewrite[rewrite_nr++] = ret;
180 if (len) {
181 ret->base = xstrndup(base, len);
182 ret->baselen = len;
183 }
184 else {
185 ret->base = xstrdup(base);
186 ret->baselen = strlen(base);
187 }
188 return ret;
189 }
190
191 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
192 {
193 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
194 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
195 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
196 rewrite->instead_of_nr++;
197 }
198
199 static void read_remotes_file(struct remote *remote)
200 {
201 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
202
203 if (!f)
204 return;
205 remote->origin = REMOTE_REMOTES;
206 while (fgets(buffer, BUF_SIZE, f)) {
207 int value_list;
208 char *s, *p;
209
210 if (!prefixcmp(buffer, "URL:")) {
211 value_list = 0;
212 s = buffer + 4;
213 } else if (!prefixcmp(buffer, "Push:")) {
214 value_list = 1;
215 s = buffer + 5;
216 } else if (!prefixcmp(buffer, "Pull:")) {
217 value_list = 2;
218 s = buffer + 5;
219 } else
220 continue;
221
222 while (isspace(*s))
223 s++;
224 if (!*s)
225 continue;
226
227 p = s + strlen(s);
228 while (isspace(p[-1]))
229 *--p = 0;
230
231 switch (value_list) {
232 case 0:
233 add_url_alias(remote, xstrdup(s));
234 break;
235 case 1:
236 add_push_refspec(remote, xstrdup(s));
237 break;
238 case 2:
239 add_fetch_refspec(remote, xstrdup(s));
240 break;
241 }
242 }
243 fclose(f);
244 }
245
246 static void read_branches_file(struct remote *remote)
247 {
248 const char *slash = strchr(remote->name, '/');
249 char *frag;
250 struct strbuf branch = STRBUF_INIT;
251 int n = slash ? slash - remote->name : 1000;
252 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
253 char *s, *p;
254 int len;
255
256 if (!f)
257 return;
258 s = fgets(buffer, BUF_SIZE, f);
259 fclose(f);
260 if (!s)
261 return;
262 while (isspace(*s))
263 s++;
264 if (!*s)
265 return;
266 remote->origin = REMOTE_BRANCHES;
267 p = s + strlen(s);
268 while (isspace(p[-1]))
269 *--p = 0;
270 len = p - s;
271 if (slash)
272 len += strlen(slash);
273 p = xmalloc(len + 1);
274 strcpy(p, s);
275 if (slash)
276 strcat(p, slash);
277
278 /*
279 * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
280 * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
281 * the partial URL obtained from the branches file plus
282 * "/netdev-2.6" and does not store it in any tracking ref.
283 * #branch specifier in the file is ignored.
284 *
285 * Otherwise, the branches file would have URL and optionally
286 * #branch specified. The "master" (or specified) branch is
287 * fetched and stored in the local branch of the same name.
288 */
289 frag = strchr(p, '#');
290 if (frag) {
291 *(frag++) = '\0';
292 strbuf_addf(&branch, "refs/heads/%s", frag);
293 } else
294 strbuf_addstr(&branch, "refs/heads/master");
295 if (!slash) {
296 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
297 } else {
298 strbuf_reset(&branch);
299 strbuf_addstr(&branch, "HEAD:");
300 }
301 add_url_alias(remote, p);
302 add_fetch_refspec(remote, strbuf_detach(&branch, 0));
303 /*
304 * Cogito compatible push: push current HEAD to remote #branch
305 * (master if missing)
306 */
307 strbuf_init(&branch, 0);
308 strbuf_addstr(&branch, "HEAD");
309 if (frag)
310 strbuf_addf(&branch, ":refs/heads/%s", frag);
311 else
312 strbuf_addstr(&branch, ":refs/heads/master");
313 add_push_refspec(remote, strbuf_detach(&branch, 0));
314 remote->fetch_tags = 1; /* always auto-follow */
315 }
316
317 static int handle_config(const char *key, const char *value, void *cb)
318 {
319 const char *name;
320 const char *subkey;
321 struct remote *remote;
322 struct branch *branch;
323 if (!prefixcmp(key, "branch.")) {
324 name = key + 7;
325 subkey = strrchr(name, '.');
326 if (!subkey)
327 return 0;
328 branch = make_branch(name, subkey - name);
329 if (!strcmp(subkey, ".remote")) {
330 if (!value)
331 return config_error_nonbool(key);
332 branch->remote_name = xstrdup(value);
333 if (branch == current_branch)
334 default_remote_name = branch->remote_name;
335 } else if (!strcmp(subkey, ".merge")) {
336 if (!value)
337 return config_error_nonbool(key);
338 add_merge(branch, xstrdup(value));
339 }
340 return 0;
341 }
342 if (!prefixcmp(key, "url.")) {
343 struct rewrite *rewrite;
344 name = key + 4;
345 subkey = strrchr(name, '.');
346 if (!subkey)
347 return 0;
348 rewrite = make_rewrite(name, subkey - name);
349 if (!strcmp(subkey, ".insteadof")) {
350 if (!value)
351 return config_error_nonbool(key);
352 add_instead_of(rewrite, xstrdup(value));
353 }
354 }
355 if (prefixcmp(key, "remote."))
356 return 0;
357 name = key + 7;
358 if (*name == '/') {
359 warning("Config remote shorthand cannot begin with '/': %s",
360 name);
361 return 0;
362 }
363 subkey = strrchr(name, '.');
364 if (!subkey)
365 return error("Config with no key for remote %s", name);
366 remote = make_remote(name, subkey - name);
367 remote->origin = REMOTE_CONFIG;
368 if (!strcmp(subkey, ".mirror"))
369 remote->mirror = git_config_bool(key, value);
370 else if (!strcmp(subkey, ".skipdefaultupdate"))
371 remote->skip_default_update = git_config_bool(key, value);
372
373 else if (!strcmp(subkey, ".url")) {
374 const char *v;
375 if (git_config_string(&v, key, value))
376 return -1;
377 add_url(remote, v);
378 } else if (!strcmp(subkey, ".push")) {
379 const char *v;
380 if (git_config_string(&v, key, value))
381 return -1;
382 add_push_refspec(remote, v);
383 } else if (!strcmp(subkey, ".fetch")) {
384 const char *v;
385 if (git_config_string(&v, key, value))
386 return -1;
387 add_fetch_refspec(remote, v);
388 } else if (!strcmp(subkey, ".receivepack")) {
389 const char *v;
390 if (git_config_string(&v, key, value))
391 return -1;
392 if (!remote->receivepack)
393 remote->receivepack = v;
394 else
395 error("more than one receivepack given, using the first");
396 } else if (!strcmp(subkey, ".uploadpack")) {
397 const char *v;
398 if (git_config_string(&v, key, value))
399 return -1;
400 if (!remote->uploadpack)
401 remote->uploadpack = v;
402 else
403 error("more than one uploadpack given, using the first");
404 } else if (!strcmp(subkey, ".tagopt")) {
405 if (!strcmp(value, "--no-tags"))
406 remote->fetch_tags = -1;
407 } else if (!strcmp(subkey, ".proxy")) {
408 return git_config_string((const char **)&remote->http_proxy,
409 key, value);
410 }
411 return 0;
412 }
413
414 static void alias_all_urls(void)
415 {
416 int i, j;
417 for (i = 0; i < remotes_nr; i++) {
418 if (!remotes[i])
419 continue;
420 for (j = 0; j < remotes[i]->url_nr; j++) {
421 remotes[i]->url[j] = alias_url(remotes[i]->url[j]);
422 }
423 }
424 }
425
426 static void read_config(void)
427 {
428 unsigned char sha1[20];
429 const char *head_ref;
430 int flag;
431 if (default_remote_name) // did this already
432 return;
433 default_remote_name = xstrdup("origin");
434 current_branch = NULL;
435 head_ref = resolve_ref("HEAD", sha1, 0, &flag);
436 if (head_ref && (flag & REF_ISSYMREF) &&
437 !prefixcmp(head_ref, "refs/heads/")) {
438 current_branch =
439 make_branch(head_ref + strlen("refs/heads/"), 0);
440 }
441 git_config(handle_config, NULL);
442 alias_all_urls();
443 }
444
445 /*
446 * We need to make sure the tracking branches are well formed, but a
447 * wildcard refspec in "struct refspec" must have a trailing slash. We
448 * temporarily drop the trailing '/' while calling check_ref_format(),
449 * and put it back. The caller knows that a CHECK_REF_FORMAT_ONELEVEL
450 * error return is Ok for a wildcard refspec.
451 */
452 static int verify_refname(char *name, int is_glob)
453 {
454 int result, len = -1;
455
456 if (is_glob) {
457 len = strlen(name);
458 assert(name[len - 1] == '/');
459 name[len - 1] = '\0';
460 }
461 result = check_ref_format(name);
462 if (is_glob)
463 name[len - 1] = '/';
464 return result;
465 }
466
467 /*
468 * This function frees a refspec array.
469 * Warning: code paths should be checked to ensure that the src
470 * and dst pointers are always freeable pointers as well
471 * as the refspec pointer itself.
472 */
473 static void free_refspecs(struct refspec *refspec, int nr_refspec)
474 {
475 int i;
476
477 if (!refspec)
478 return;
479
480 for (i = 0; i < nr_refspec; i++) {
481 free(refspec[i].src);
482 free(refspec[i].dst);
483 }
484 free(refspec);
485 }
486
487 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
488 {
489 int i;
490 int st;
491 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
492
493 for (i = 0; i < nr_refspec; i++) {
494 size_t llen;
495 int is_glob;
496 const char *lhs, *rhs;
497
498 llen = is_glob = 0;
499
500 lhs = refspec[i];
501 if (*lhs == '+') {
502 rs[i].force = 1;
503 lhs++;
504 }
505
506 rhs = strrchr(lhs, ':');
507
508 /*
509 * Before going on, special case ":" (or "+:") as a refspec
510 * for matching refs.
511 */
512 if (!fetch && rhs == lhs && rhs[1] == '\0') {
513 rs[i].matching = 1;
514 continue;
515 }
516
517 if (rhs) {
518 size_t rlen = strlen(++rhs);
519 is_glob = (2 <= rlen && !strcmp(rhs + rlen - 2, "/*"));
520 rs[i].dst = xstrndup(rhs, rlen - is_glob);
521 }
522
523 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
524 if (2 <= llen && !memcmp(lhs + llen - 2, "/*", 2)) {
525 if ((rhs && !is_glob) || (!rhs && fetch))
526 goto invalid;
527 is_glob = 1;
528 llen--;
529 } else if (rhs && is_glob) {
530 goto invalid;
531 }
532
533 rs[i].pattern = is_glob;
534 rs[i].src = xstrndup(lhs, llen);
535
536 if (fetch) {
537 /*
538 * LHS
539 * - empty is allowed; it means HEAD.
540 * - otherwise it must be a valid looking ref.
541 */
542 if (!*rs[i].src)
543 ; /* empty is ok */
544 else {
545 st = verify_refname(rs[i].src, is_glob);
546 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
547 goto invalid;
548 }
549 /*
550 * RHS
551 * - missing is ok, and is same as empty.
552 * - empty is ok; it means not to store.
553 * - otherwise it must be a valid looking ref.
554 */
555 if (!rs[i].dst) {
556 ; /* ok */
557 } else if (!*rs[i].dst) {
558 ; /* ok */
559 } else {
560 st = verify_refname(rs[i].dst, is_glob);
561 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
562 goto invalid;
563 }
564 } else {
565 /*
566 * LHS
567 * - empty is allowed; it means delete.
568 * - when wildcarded, it must be a valid looking ref.
569 * - otherwise, it must be an extended SHA-1, but
570 * there is no existing way to validate this.
571 */
572 if (!*rs[i].src)
573 ; /* empty is ok */
574 else if (is_glob) {
575 st = verify_refname(rs[i].src, is_glob);
576 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
577 goto invalid;
578 }
579 else
580 ; /* anything goes, for now */
581 /*
582 * RHS
583 * - missing is allowed, but LHS then must be a
584 * valid looking ref.
585 * - empty is not allowed.
586 * - otherwise it must be a valid looking ref.
587 */
588 if (!rs[i].dst) {
589 st = verify_refname(rs[i].src, is_glob);
590 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
591 goto invalid;
592 } else if (!*rs[i].dst) {
593 goto invalid;
594 } else {
595 st = verify_refname(rs[i].dst, is_glob);
596 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
597 goto invalid;
598 }
599 }
600 }
601 return rs;
602
603 invalid:
604 if (verify) {
605 /*
606 * nr_refspec must be greater than zero and i must be valid
607 * since it is only possible to reach this point from within
608 * the for loop above.
609 */
610 free_refspecs(rs, i+1);
611 return NULL;
612 }
613 die("Invalid refspec '%s'", refspec[i]);
614 }
615
616 int valid_fetch_refspec(const char *fetch_refspec_str)
617 {
618 const char *fetch_refspec[] = { fetch_refspec_str };
619 struct refspec *refspec;
620
621 refspec = parse_refspec_internal(1, fetch_refspec, 1, 1);
622 free_refspecs(refspec, 1);
623 return !!refspec;
624 }
625
626 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
627 {
628 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
629 }
630
631 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
632 {
633 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
634 }
635
636 static int valid_remote_nick(const char *name)
637 {
638 if (!name[0] || is_dot_or_dotdot(name))
639 return 0;
640 return !strchr(name, '/'); /* no slash */
641 }
642
643 struct remote *remote_get(const char *name)
644 {
645 struct remote *ret;
646
647 read_config();
648 if (!name)
649 name = default_remote_name;
650 ret = make_remote(name, 0);
651 if (valid_remote_nick(name)) {
652 if (!ret->url)
653 read_remotes_file(ret);
654 if (!ret->url)
655 read_branches_file(ret);
656 }
657 if (!ret->url)
658 add_url_alias(ret, name);
659 if (!ret->url)
660 return NULL;
661 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
662 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
663 return ret;
664 }
665
666 int for_each_remote(each_remote_fn fn, void *priv)
667 {
668 int i, result = 0;
669 read_config();
670 for (i = 0; i < remotes_nr && !result; i++) {
671 struct remote *r = remotes[i];
672 if (!r)
673 continue;
674 if (!r->fetch)
675 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
676 r->fetch_refspec);
677 if (!r->push)
678 r->push = parse_push_refspec(r->push_refspec_nr,
679 r->push_refspec);
680 result = fn(r, priv);
681 }
682 return result;
683 }
684
685 void ref_remove_duplicates(struct ref *ref_map)
686 {
687 struct ref **posn;
688 struct ref *next;
689 for (; ref_map; ref_map = ref_map->next) {
690 if (!ref_map->peer_ref)
691 continue;
692 posn = &ref_map->next;
693 while (*posn) {
694 if ((*posn)->peer_ref &&
695 !strcmp((*posn)->peer_ref->name,
696 ref_map->peer_ref->name)) {
697 if (strcmp((*posn)->name, ref_map->name))
698 die("%s tracks both %s and %s",
699 ref_map->peer_ref->name,
700 (*posn)->name, ref_map->name);
701 next = (*posn)->next;
702 free((*posn)->peer_ref);
703 free(*posn);
704 *posn = next;
705 } else {
706 posn = &(*posn)->next;
707 }
708 }
709 }
710 }
711
712 int remote_has_url(struct remote *remote, const char *url)
713 {
714 int i;
715 for (i = 0; i < remote->url_nr; i++) {
716 if (!strcmp(remote->url[i], url))
717 return 1;
718 }
719 return 0;
720 }
721
722 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
723 {
724 int find_src = refspec->src == NULL;
725 char *needle, **result;
726 int i;
727
728 if (find_src) {
729 if (!refspec->dst)
730 return error("find_tracking: need either src or dst");
731 needle = refspec->dst;
732 result = &refspec->src;
733 } else {
734 needle = refspec->src;
735 result = &refspec->dst;
736 }
737
738 for (i = 0; i < remote->fetch_refspec_nr; i++) {
739 struct refspec *fetch = &remote->fetch[i];
740 const char *key = find_src ? fetch->dst : fetch->src;
741 const char *value = find_src ? fetch->src : fetch->dst;
742 if (!fetch->dst)
743 continue;
744 if (fetch->pattern) {
745 if (!prefixcmp(needle, key)) {
746 *result = xmalloc(strlen(value) +
747 strlen(needle) -
748 strlen(key) + 1);
749 strcpy(*result, value);
750 strcpy(*result + strlen(value),
751 needle + strlen(key));
752 refspec->force = fetch->force;
753 return 0;
754 }
755 } else if (!strcmp(needle, key)) {
756 *result = xstrdup(value);
757 refspec->force = fetch->force;
758 return 0;
759 }
760 }
761 return -1;
762 }
763
764 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
765 const char *name)
766 {
767 size_t len = strlen(name);
768 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
769 memcpy(ref->name, prefix, prefixlen);
770 memcpy(ref->name + prefixlen, name, len);
771 return ref;
772 }
773
774 struct ref *alloc_ref(const char *name)
775 {
776 return alloc_ref_with_prefix("", 0, name);
777 }
778
779 static struct ref *copy_ref(const struct ref *ref)
780 {
781 struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
782 memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
783 ret->next = NULL;
784 return ret;
785 }
786
787 struct ref *copy_ref_list(const struct ref *ref)
788 {
789 struct ref *ret = NULL;
790 struct ref **tail = &ret;
791 while (ref) {
792 *tail = copy_ref(ref);
793 ref = ref->next;
794 tail = &((*tail)->next);
795 }
796 return ret;
797 }
798
799 static void free_ref(struct ref *ref)
800 {
801 if (!ref)
802 return;
803 free(ref->remote_status);
804 free(ref->symref);
805 free(ref);
806 }
807
808 void free_refs(struct ref *ref)
809 {
810 struct ref *next;
811 while (ref) {
812 next = ref->next;
813 free(ref->peer_ref);
814 free_ref(ref);
815 ref = next;
816 }
817 }
818
819 static int count_refspec_match(const char *pattern,
820 struct ref *refs,
821 struct ref **matched_ref)
822 {
823 int patlen = strlen(pattern);
824 struct ref *matched_weak = NULL;
825 struct ref *matched = NULL;
826 int weak_match = 0;
827 int match = 0;
828
829 for (weak_match = match = 0; refs; refs = refs->next) {
830 char *name = refs->name;
831 int namelen = strlen(name);
832
833 if (!refname_match(pattern, name, ref_rev_parse_rules))
834 continue;
835
836 /* A match is "weak" if it is with refs outside
837 * heads or tags, and did not specify the pattern
838 * in full (e.g. "refs/remotes/origin/master") or at
839 * least from the toplevel (e.g. "remotes/origin/master");
840 * otherwise "git push $URL master" would result in
841 * ambiguity between remotes/origin/master and heads/master
842 * at the remote site.
843 */
844 if (namelen != patlen &&
845 patlen != namelen - 5 &&
846 prefixcmp(name, "refs/heads/") &&
847 prefixcmp(name, "refs/tags/")) {
848 /* We want to catch the case where only weak
849 * matches are found and there are multiple
850 * matches, and where more than one strong
851 * matches are found, as ambiguous. One
852 * strong match with zero or more weak matches
853 * are acceptable as a unique match.
854 */
855 matched_weak = refs;
856 weak_match++;
857 }
858 else {
859 matched = refs;
860 match++;
861 }
862 }
863 if (!matched) {
864 *matched_ref = matched_weak;
865 return weak_match;
866 }
867 else {
868 *matched_ref = matched;
869 return match;
870 }
871 }
872
873 static void tail_link_ref(struct ref *ref, struct ref ***tail)
874 {
875 **tail = ref;
876 while (ref->next)
877 ref = ref->next;
878 *tail = &ref->next;
879 }
880
881 static struct ref *try_explicit_object_name(const char *name)
882 {
883 unsigned char sha1[20];
884 struct ref *ref;
885
886 if (!*name) {
887 ref = alloc_ref("(delete)");
888 hashclr(ref->new_sha1);
889 return ref;
890 }
891 if (get_sha1(name, sha1))
892 return NULL;
893 ref = alloc_ref(name);
894 hashcpy(ref->new_sha1, sha1);
895 return ref;
896 }
897
898 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
899 {
900 struct ref *ret = alloc_ref(name);
901 tail_link_ref(ret, tail);
902 return ret;
903 }
904
905 static char *guess_ref(const char *name, struct ref *peer)
906 {
907 struct strbuf buf = STRBUF_INIT;
908 unsigned char sha1[20];
909
910 const char *r = resolve_ref(peer->name, sha1, 1, NULL);
911 if (!r)
912 return NULL;
913
914 if (!prefixcmp(r, "refs/heads/"))
915 strbuf_addstr(&buf, "refs/heads/");
916 else if (!prefixcmp(r, "refs/tags/"))
917 strbuf_addstr(&buf, "refs/tags/");
918 else
919 return NULL;
920
921 strbuf_addstr(&buf, name);
922 return strbuf_detach(&buf, NULL);
923 }
924
925 static int match_explicit(struct ref *src, struct ref *dst,
926 struct ref ***dst_tail,
927 struct refspec *rs)
928 {
929 struct ref *matched_src, *matched_dst;
930
931 const char *dst_value = rs->dst;
932 char *dst_guess;
933
934 if (rs->pattern || rs->matching)
935 return 0;
936
937 matched_src = matched_dst = NULL;
938 switch (count_refspec_match(rs->src, src, &matched_src)) {
939 case 1:
940 break;
941 case 0:
942 /* The source could be in the get_sha1() format
943 * not a reference name. :refs/other is a
944 * way to delete 'other' ref at the remote end.
945 */
946 matched_src = try_explicit_object_name(rs->src);
947 if (!matched_src)
948 return error("src refspec %s does not match any.", rs->src);
949 break;
950 default:
951 return error("src refspec %s matches more than one.", rs->src);
952 }
953
954 if (!dst_value) {
955 unsigned char sha1[20];
956 int flag;
957
958 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
959 if (!dst_value ||
960 ((flag & REF_ISSYMREF) &&
961 prefixcmp(dst_value, "refs/heads/")))
962 die("%s cannot be resolved to branch.",
963 matched_src->name);
964 }
965
966 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
967 case 1:
968 break;
969 case 0:
970 if (!memcmp(dst_value, "refs/", 5))
971 matched_dst = make_linked_ref(dst_value, dst_tail);
972 else if((dst_guess = guess_ref(dst_value, matched_src)))
973 matched_dst = make_linked_ref(dst_guess, dst_tail);
974 else
975 error("unable to push to unqualified destination: %s\n"
976 "The destination refspec neither matches an "
977 "existing ref on the remote nor\n"
978 "begins with refs/, and we are unable to "
979 "guess a prefix based on the source ref.",
980 dst_value);
981 break;
982 default:
983 matched_dst = NULL;
984 error("dst refspec %s matches more than one.",
985 dst_value);
986 break;
987 }
988 if (!matched_dst)
989 return -1;
990 if (matched_dst->peer_ref)
991 return error("dst ref %s receives from more than one src.",
992 matched_dst->name);
993 else {
994 matched_dst->peer_ref = matched_src;
995 matched_dst->force = rs->force;
996 }
997 return 0;
998 }
999
1000 static int match_explicit_refs(struct ref *src, struct ref *dst,
1001 struct ref ***dst_tail, struct refspec *rs,
1002 int rs_nr)
1003 {
1004 int i, errs;
1005 for (i = errs = 0; i < rs_nr; i++)
1006 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1007 return errs;
1008 }
1009
1010 static const struct refspec *check_pattern_match(const struct refspec *rs,
1011 int rs_nr,
1012 const struct ref *src)
1013 {
1014 int i;
1015 int matching_refs = -1;
1016 for (i = 0; i < rs_nr; i++) {
1017 if (rs[i].matching &&
1018 (matching_refs == -1 || rs[i].force)) {
1019 matching_refs = i;
1020 continue;
1021 }
1022
1023 if (rs[i].pattern && !prefixcmp(src->name, rs[i].src))
1024 return rs + i;
1025 }
1026 if (matching_refs != -1)
1027 return rs + matching_refs;
1028 else
1029 return NULL;
1030 }
1031
1032 /*
1033 * Note. This is used only by "push"; refspec matching rules for
1034 * push and fetch are subtly different, so do not try to reuse it
1035 * without thinking.
1036 */
1037 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
1038 int nr_refspec, const char **refspec, int flags)
1039 {
1040 struct refspec *rs;
1041 int send_all = flags & MATCH_REFS_ALL;
1042 int send_mirror = flags & MATCH_REFS_MIRROR;
1043 static const char *default_refspec[] = { ":", 0 };
1044
1045 if (!nr_refspec) {
1046 nr_refspec = 1;
1047 refspec = default_refspec;
1048 }
1049 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1050 if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
1051 return -1;
1052
1053 /* pick the remainder */
1054 for ( ; src; src = src->next) {
1055 struct ref *dst_peer;
1056 const struct refspec *pat = NULL;
1057 char *dst_name;
1058 if (src->peer_ref)
1059 continue;
1060
1061 pat = check_pattern_match(rs, nr_refspec, src);
1062 if (!pat)
1063 continue;
1064
1065 if (pat->matching) {
1066 /*
1067 * "matching refs"; traditionally we pushed everything
1068 * including refs outside refs/heads/ hierarchy, but
1069 * that does not make much sense these days.
1070 */
1071 if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
1072 continue;
1073 dst_name = xstrdup(src->name);
1074
1075 } else {
1076 const char *dst_side = pat->dst ? pat->dst : pat->src;
1077 dst_name = xmalloc(strlen(dst_side) +
1078 strlen(src->name) -
1079 strlen(pat->src) + 2);
1080 strcpy(dst_name, dst_side);
1081 strcat(dst_name, src->name + strlen(pat->src));
1082 }
1083 dst_peer = find_ref_by_name(dst, dst_name);
1084 if (dst_peer) {
1085 if (dst_peer->peer_ref)
1086 /* We're already sending something to this ref. */
1087 goto free_name;
1088
1089 } else {
1090 if (pat->matching && !(send_all || send_mirror))
1091 /*
1092 * Remote doesn't have it, and we have no
1093 * explicit pattern, and we don't have
1094 * --all nor --mirror.
1095 */
1096 goto free_name;
1097
1098 /* Create a new one and link it */
1099 dst_peer = make_linked_ref(dst_name, dst_tail);
1100 hashcpy(dst_peer->new_sha1, src->new_sha1);
1101 }
1102 dst_peer->peer_ref = src;
1103 dst_peer->force = pat->force;
1104 free_name:
1105 free(dst_name);
1106 }
1107 return 0;
1108 }
1109
1110 struct branch *branch_get(const char *name)
1111 {
1112 struct branch *ret;
1113
1114 read_config();
1115 if (!name || !*name || !strcmp(name, "HEAD"))
1116 ret = current_branch;
1117 else
1118 ret = make_branch(name, 0);
1119 if (ret && ret->remote_name) {
1120 ret->remote = remote_get(ret->remote_name);
1121 if (ret->merge_nr) {
1122 int i;
1123 ret->merge = xcalloc(sizeof(*ret->merge),
1124 ret->merge_nr);
1125 for (i = 0; i < ret->merge_nr; i++) {
1126 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1127 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1128 remote_find_tracking(ret->remote,
1129 ret->merge[i]);
1130 }
1131 }
1132 }
1133 return ret;
1134 }
1135
1136 int branch_has_merge_config(struct branch *branch)
1137 {
1138 return branch && !!branch->merge;
1139 }
1140
1141 int branch_merge_matches(struct branch *branch,
1142 int i,
1143 const char *refname)
1144 {
1145 if (!branch || i < 0 || i >= branch->merge_nr)
1146 return 0;
1147 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1148 }
1149
1150 static struct ref *get_expanded_map(const struct ref *remote_refs,
1151 const struct refspec *refspec)
1152 {
1153 const struct ref *ref;
1154 struct ref *ret = NULL;
1155 struct ref **tail = &ret;
1156
1157 int remote_prefix_len = strlen(refspec->src);
1158 int local_prefix_len = strlen(refspec->dst);
1159
1160 for (ref = remote_refs; ref; ref = ref->next) {
1161 if (strchr(ref->name, '^'))
1162 continue; /* a dereference item */
1163 if (!prefixcmp(ref->name, refspec->src)) {
1164 const char *match;
1165 struct ref *cpy = copy_ref(ref);
1166 match = ref->name + remote_prefix_len;
1167
1168 cpy->peer_ref = alloc_ref_with_prefix(refspec->dst,
1169 local_prefix_len, match);
1170 if (refspec->force)
1171 cpy->peer_ref->force = 1;
1172 *tail = cpy;
1173 tail = &cpy->next;
1174 }
1175 }
1176
1177 return ret;
1178 }
1179
1180 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1181 {
1182 const struct ref *ref;
1183 for (ref = refs; ref; ref = ref->next) {
1184 if (refname_match(name, ref->name, ref_fetch_rules))
1185 return ref;
1186 }
1187 return NULL;
1188 }
1189
1190 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1191 {
1192 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1193
1194 if (!ref)
1195 return NULL;
1196
1197 return copy_ref(ref);
1198 }
1199
1200 static struct ref *get_local_ref(const char *name)
1201 {
1202 if (!name)
1203 return NULL;
1204
1205 if (!prefixcmp(name, "refs/"))
1206 return alloc_ref(name);
1207
1208 if (!prefixcmp(name, "heads/") ||
1209 !prefixcmp(name, "tags/") ||
1210 !prefixcmp(name, "remotes/"))
1211 return alloc_ref_with_prefix("refs/", 5, name);
1212
1213 return alloc_ref_with_prefix("refs/heads/", 11, name);
1214 }
1215
1216 int get_fetch_map(const struct ref *remote_refs,
1217 const struct refspec *refspec,
1218 struct ref ***tail,
1219 int missing_ok)
1220 {
1221 struct ref *ref_map, **rmp;
1222
1223 if (refspec->pattern) {
1224 ref_map = get_expanded_map(remote_refs, refspec);
1225 } else {
1226 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1227
1228 ref_map = get_remote_ref(remote_refs, name);
1229 if (!missing_ok && !ref_map)
1230 die("Couldn't find remote ref %s", name);
1231 if (ref_map) {
1232 ref_map->peer_ref = get_local_ref(refspec->dst);
1233 if (ref_map->peer_ref && refspec->force)
1234 ref_map->peer_ref->force = 1;
1235 }
1236 }
1237
1238 for (rmp = &ref_map; *rmp; ) {
1239 if ((*rmp)->peer_ref) {
1240 int st = check_ref_format((*rmp)->peer_ref->name + 5);
1241 if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
1242 struct ref *ignore = *rmp;
1243 error("* Ignoring funny ref '%s' locally",
1244 (*rmp)->peer_ref->name);
1245 *rmp = (*rmp)->next;
1246 free(ignore->peer_ref);
1247 free(ignore);
1248 continue;
1249 }
1250 }
1251 rmp = &((*rmp)->next);
1252 }
1253
1254 if (ref_map)
1255 tail_link_ref(ref_map, tail);
1256
1257 return 0;
1258 }
1259
1260 int resolve_remote_symref(struct ref *ref, struct ref *list)
1261 {
1262 if (!ref->symref)
1263 return 0;
1264 for (; list; list = list->next)
1265 if (!strcmp(ref->symref, list->name)) {
1266 hashcpy(ref->old_sha1, list->old_sha1);
1267 return 0;
1268 }
1269 return 1;
1270 }
1271
1272 /*
1273 * Return true if there is anything to report, otherwise false.
1274 */
1275 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1276 {
1277 unsigned char sha1[20];
1278 struct commit *ours, *theirs;
1279 char symmetric[84];
1280 struct rev_info revs;
1281 const char *rev_argv[10], *base;
1282 int rev_argc;
1283
1284 /*
1285 * Nothing to report unless we are marked to build on top of
1286 * somebody else.
1287 */
1288 if (!branch ||
1289 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1290 return 0;
1291
1292 /*
1293 * If what we used to build on no longer exists, there is
1294 * nothing to report.
1295 */
1296 base = branch->merge[0]->dst;
1297 if (!resolve_ref(base, sha1, 1, NULL))
1298 return 0;
1299 theirs = lookup_commit(sha1);
1300 if (!theirs)
1301 return 0;
1302
1303 if (!resolve_ref(branch->refname, sha1, 1, NULL))
1304 return 0;
1305 ours = lookup_commit(sha1);
1306 if (!ours)
1307 return 0;
1308
1309 /* are we the same? */
1310 if (theirs == ours)
1311 return 0;
1312
1313 /* Run "rev-list --left-right ours...theirs" internally... */
1314 rev_argc = 0;
1315 rev_argv[rev_argc++] = NULL;
1316 rev_argv[rev_argc++] = "--left-right";
1317 rev_argv[rev_argc++] = symmetric;
1318 rev_argv[rev_argc++] = "--";
1319 rev_argv[rev_argc] = NULL;
1320
1321 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1322 strcpy(symmetric + 40, "...");
1323 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1324
1325 init_revisions(&revs, NULL);
1326 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1327 prepare_revision_walk(&revs);
1328
1329 /* ... and count the commits on each side. */
1330 *num_ours = 0;
1331 *num_theirs = 0;
1332 while (1) {
1333 struct commit *c = get_revision(&revs);
1334 if (!c)
1335 break;
1336 if (c->object.flags & SYMMETRIC_LEFT)
1337 (*num_ours)++;
1338 else
1339 (*num_theirs)++;
1340 }
1341
1342 /* clear object flags smudged by the above traversal */
1343 clear_commit_marks(ours, ALL_REV_FLAGS);
1344 clear_commit_marks(theirs, ALL_REV_FLAGS);
1345 return 1;
1346 }
1347
1348 /*
1349 * Return true when there is anything to report, otherwise false.
1350 */
1351 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1352 {
1353 int num_ours, num_theirs;
1354 const char *base;
1355
1356 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1357 return 0;
1358
1359 base = branch->merge[0]->dst;
1360 if (!prefixcmp(base, "refs/remotes/")) {
1361 base += strlen("refs/remotes/");
1362 }
1363 if (!num_theirs)
1364 strbuf_addf(sb, "Your branch is ahead of '%s' "
1365 "by %d commit%s.\n",
1366 base, num_ours, (num_ours == 1) ? "" : "s");
1367 else if (!num_ours)
1368 strbuf_addf(sb, "Your branch is behind '%s' "
1369 "by %d commit%s, "
1370 "and can be fast-forwarded.\n",
1371 base, num_theirs, (num_theirs == 1) ? "" : "s");
1372 else
1373 strbuf_addf(sb, "Your branch and '%s' have diverged,\n"
1374 "and have %d and %d different commit(s) each, "
1375 "respectively.\n",
1376 base, num_ours, num_theirs);
1377 return 1;
1378 }