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#include "tag.h"
9
10static struct refspec s_tag_refspec = {
11 0,
12 1,
13 0,
14 "refs/tags/*",
15 "refs/tags/*"
16};
17
18const struct refspec *tag_refspec = &s_tag_refspec;
19
20struct counted_string {
21 size_t len;
22 const char *s;
23};
24struct rewrite {
25 const char *base;
26 size_t baselen;
27 struct counted_string *instead_of;
28 int instead_of_nr;
29 int instead_of_alloc;
30};
31
32static struct remote **remotes;
33static int remotes_alloc;
34static int remotes_nr;
35
36static struct branch **branches;
37static int branches_alloc;
38static int branches_nr;
39
40static struct branch *current_branch;
41static const char *default_remote_name;
42
43static struct rewrite **rewrite;
44static int rewrite_alloc;
45static int rewrite_nr;
46
47#define BUF_SIZE (2048)
48static char buffer[BUF_SIZE];
49
50static const char *alias_url(const char *url)
51{
52 int i, j;
53 char *ret;
54 struct counted_string *longest;
55 int longest_i;
56
57 longest = NULL;
58 longest_i = -1;
59 for (i = 0; i < rewrite_nr; i++) {
60 if (!rewrite[i])
61 continue;
62 for (j = 0; j < rewrite[i]->instead_of_nr; j++) {
63 if (!prefixcmp(url, rewrite[i]->instead_of[j].s) &&
64 (!longest ||
65 longest->len < rewrite[i]->instead_of[j].len)) {
66 longest = &(rewrite[i]->instead_of[j]);
67 longest_i = i;
68 }
69 }
70 }
71 if (!longest)
72 return url;
73
74 ret = xmalloc(rewrite[longest_i]->baselen +
75 (strlen(url) - longest->len) + 1);
76 strcpy(ret, rewrite[longest_i]->base);
77 strcpy(ret + rewrite[longest_i]->baselen, url + longest->len);
78 return ret;
79}
80
81static void add_push_refspec(struct remote *remote, const char *ref)
82{
83 ALLOC_GROW(remote->push_refspec,
84 remote->push_refspec_nr + 1,
85 remote->push_refspec_alloc);
86 remote->push_refspec[remote->push_refspec_nr++] = ref;
87}
88
89static void add_fetch_refspec(struct remote *remote, const char *ref)
90{
91 ALLOC_GROW(remote->fetch_refspec,
92 remote->fetch_refspec_nr + 1,
93 remote->fetch_refspec_alloc);
94 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
95}
96
97static void add_url(struct remote *remote, const char *url)
98{
99 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
100 remote->url[remote->url_nr++] = url;
101}
102
103static void add_url_alias(struct remote *remote, const char *url)
104{
105 add_url(remote, alias_url(url));
106}
107
108static struct remote *make_remote(const char *name, int len)
109{
110 struct remote *ret;
111 int i;
112
113 for (i = 0; i < remotes_nr; i++) {
114 if (len ? (!strncmp(name, remotes[i]->name, len) &&
115 !remotes[i]->name[len]) :
116 !strcmp(name, remotes[i]->name))
117 return remotes[i];
118 }
119
120 ret = xcalloc(1, sizeof(struct remote));
121 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
122 remotes[remotes_nr++] = ret;
123 if (len)
124 ret->name = xstrndup(name, len);
125 else
126 ret->name = xstrdup(name);
127 return ret;
128}
129
130static void add_merge(struct branch *branch, const char *name)
131{
132 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
133 branch->merge_alloc);
134 branch->merge_name[branch->merge_nr++] = name;
135}
136
137static struct branch *make_branch(const char *name, int len)
138{
139 struct branch *ret;
140 int i;
141 char *refname;
142
143 for (i = 0; i < branches_nr; i++) {
144 if (len ? (!strncmp(name, branches[i]->name, len) &&
145 !branches[i]->name[len]) :
146 !strcmp(name, branches[i]->name))
147 return branches[i];
148 }
149
150 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
151 ret = xcalloc(1, sizeof(struct branch));
152 branches[branches_nr++] = ret;
153 if (len)
154 ret->name = xstrndup(name, len);
155 else
156 ret->name = xstrdup(name);
157 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
158 strcpy(refname, "refs/heads/");
159 strcpy(refname + strlen("refs/heads/"), ret->name);
160 ret->refname = refname;
161
162 return ret;
163}
164
165static struct rewrite *make_rewrite(const char *base, int len)
166{
167 struct rewrite *ret;
168 int i;
169
170 for (i = 0; i < rewrite_nr; i++) {
171 if (len
172 ? (len == rewrite[i]->baselen &&
173 !strncmp(base, rewrite[i]->base, len))
174 : !strcmp(base, rewrite[i]->base))
175 return rewrite[i];
176 }
177
178 ALLOC_GROW(rewrite, rewrite_nr + 1, rewrite_alloc);
179 ret = xcalloc(1, sizeof(struct rewrite));
180 rewrite[rewrite_nr++] = ret;
181 if (len) {
182 ret->base = xstrndup(base, len);
183 ret->baselen = len;
184 }
185 else {
186 ret->base = xstrdup(base);
187 ret->baselen = strlen(base);
188 }
189 return ret;
190}
191
192static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
193{
194 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
195 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
196 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
197 rewrite->instead_of_nr++;
198}
199
200static void read_remotes_file(struct remote *remote)
201{
202 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
203
204 if (!f)
205 return;
206 remote->origin = REMOTE_REMOTES;
207 while (fgets(buffer, BUF_SIZE, f)) {
208 int value_list;
209 char *s, *p;
210
211 if (!prefixcmp(buffer, "URL:")) {
212 value_list = 0;
213 s = buffer + 4;
214 } else if (!prefixcmp(buffer, "Push:")) {
215 value_list = 1;
216 s = buffer + 5;
217 } else if (!prefixcmp(buffer, "Pull:")) {
218 value_list = 2;
219 s = buffer + 5;
220 } else
221 continue;
222
223 while (isspace(*s))
224 s++;
225 if (!*s)
226 continue;
227
228 p = s + strlen(s);
229 while (isspace(p[-1]))
230 *--p = 0;
231
232 switch (value_list) {
233 case 0:
234 add_url_alias(remote, xstrdup(s));
235 break;
236 case 1:
237 add_push_refspec(remote, xstrdup(s));
238 break;
239 case 2:
240 add_fetch_refspec(remote, xstrdup(s));
241 break;
242 }
243 }
244 fclose(f);
245}
246
247static void read_branches_file(struct remote *remote)
248{
249 const char *slash = strchr(remote->name, '/');
250 char *frag;
251 struct strbuf branch = STRBUF_INIT;
252 int n = slash ? slash - remote->name : 1000;
253 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
254 char *s, *p;
255 int len;
256
257 if (!f)
258 return;
259 s = fgets(buffer, BUF_SIZE, f);
260 fclose(f);
261 if (!s)
262 return;
263 while (isspace(*s))
264 s++;
265 if (!*s)
266 return;
267 remote->origin = REMOTE_BRANCHES;
268 p = s + strlen(s);
269 while (isspace(p[-1]))
270 *--p = 0;
271 len = p - s;
272 if (slash)
273 len += strlen(slash);
274 p = xmalloc(len + 1);
275 strcpy(p, s);
276 if (slash)
277 strcat(p, slash);
278
279 /*
280 * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
281 * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
282 * the partial URL obtained from the branches file plus
283 * "/netdev-2.6" and does not store it in any tracking ref.
284 * #branch specifier in the file is ignored.
285 *
286 * Otherwise, the branches file would have URL and optionally
287 * #branch specified. The "master" (or specified) branch is
288 * fetched and stored in the local branch of the same name.
289 */
290 frag = strchr(p, '#');
291 if (frag) {
292 *(frag++) = '\0';
293 strbuf_addf(&branch, "refs/heads/%s", frag);
294 } else
295 strbuf_addstr(&branch, "refs/heads/master");
296 if (!slash) {
297 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
298 } else {
299 strbuf_reset(&branch);
300 strbuf_addstr(&branch, "HEAD:");
301 }
302 add_url_alias(remote, p);
303 add_fetch_refspec(remote, strbuf_detach(&branch, 0));
304 /*
305 * Cogito compatible push: push current HEAD to remote #branch
306 * (master if missing)
307 */
308 strbuf_init(&branch, 0);
309 strbuf_addstr(&branch, "HEAD");
310 if (frag)
311 strbuf_addf(&branch, ":refs/heads/%s", frag);
312 else
313 strbuf_addstr(&branch, ":refs/heads/master");
314 add_push_refspec(remote, strbuf_detach(&branch, 0));
315 remote->fetch_tags = 1; /* always auto-follow */
316}
317
318static int handle_config(const char *key, const char *value, void *cb)
319{
320 const char *name;
321 const char *subkey;
322 struct remote *remote;
323 struct branch *branch;
324 if (!prefixcmp(key, "branch.")) {
325 name = key + 7;
326 subkey = strrchr(name, '.');
327 if (!subkey)
328 return 0;
329 branch = make_branch(name, subkey - name);
330 if (!strcmp(subkey, ".remote")) {
331 if (!value)
332 return config_error_nonbool(key);
333 branch->remote_name = xstrdup(value);
334 if (branch == current_branch)
335 default_remote_name = branch->remote_name;
336 } else if (!strcmp(subkey, ".merge")) {
337 if (!value)
338 return config_error_nonbool(key);
339 add_merge(branch, xstrdup(value));
340 }
341 return 0;
342 }
343 if (!prefixcmp(key, "url.")) {
344 struct rewrite *rewrite;
345 name = key + 4;
346 subkey = strrchr(name, '.');
347 if (!subkey)
348 return 0;
349 rewrite = make_rewrite(name, subkey - name);
350 if (!strcmp(subkey, ".insteadof")) {
351 if (!value)
352 return config_error_nonbool(key);
353 add_instead_of(rewrite, xstrdup(value));
354 }
355 }
356 if (prefixcmp(key, "remote."))
357 return 0;
358 name = key + 7;
359 if (*name == '/') {
360 warning("Config remote shorthand cannot begin with '/': %s",
361 name);
362 return 0;
363 }
364 subkey = strrchr(name, '.');
365 if (!subkey)
366 return error("Config with no key for remote %s", name);
367 remote = make_remote(name, subkey - name);
368 remote->origin = REMOTE_CONFIG;
369 if (!strcmp(subkey, ".mirror"))
370 remote->mirror = git_config_bool(key, value);
371 else if (!strcmp(subkey, ".skipdefaultupdate"))
372 remote->skip_default_update = git_config_bool(key, value);
373
374 else if (!strcmp(subkey, ".url")) {
375 const char *v;
376 if (git_config_string(&v, key, value))
377 return -1;
378 add_url(remote, v);
379 } else if (!strcmp(subkey, ".push")) {
380 const char *v;
381 if (git_config_string(&v, key, value))
382 return -1;
383 add_push_refspec(remote, v);
384 } else if (!strcmp(subkey, ".fetch")) {
385 const char *v;
386 if (git_config_string(&v, key, value))
387 return -1;
388 add_fetch_refspec(remote, v);
389 } else if (!strcmp(subkey, ".receivepack")) {
390 const char *v;
391 if (git_config_string(&v, key, value))
392 return -1;
393 if (!remote->receivepack)
394 remote->receivepack = v;
395 else
396 error("more than one receivepack given, using the first");
397 } else if (!strcmp(subkey, ".uploadpack")) {
398 const char *v;
399 if (git_config_string(&v, key, value))
400 return -1;
401 if (!remote->uploadpack)
402 remote->uploadpack = v;
403 else
404 error("more than one uploadpack given, using the first");
405 } else if (!strcmp(subkey, ".tagopt")) {
406 if (!strcmp(value, "--no-tags"))
407 remote->fetch_tags = -1;
408 } else if (!strcmp(subkey, ".proxy")) {
409 return git_config_string((const char **)&remote->http_proxy,
410 key, value);
411 }
412 return 0;
413}
414
415static void alias_all_urls(void)
416{
417 int i, j;
418 for (i = 0; i < remotes_nr; i++) {
419 if (!remotes[i])
420 continue;
421 for (j = 0; j < remotes[i]->url_nr; j++) {
422 remotes[i]->url[j] = alias_url(remotes[i]->url[j]);
423 }
424 }
425}
426
427static void read_config(void)
428{
429 unsigned char sha1[20];
430 const char *head_ref;
431 int flag;
432 if (default_remote_name) // did this already
433 return;
434 default_remote_name = xstrdup("origin");
435 current_branch = NULL;
436 head_ref = resolve_ref("HEAD", sha1, 0, &flag);
437 if (head_ref && (flag & REF_ISSYMREF) &&
438 !prefixcmp(head_ref, "refs/heads/")) {
439 current_branch =
440 make_branch(head_ref + strlen("refs/heads/"), 0);
441 }
442 git_config(handle_config, NULL);
443 alias_all_urls();
444}
445
446/*
447 * We need to make sure the tracking branches are well formed, but a
448 * wildcard refspec in "struct refspec" must have a trailing slash. We
449 * temporarily drop the trailing '/' while calling check_ref_format(),
450 * and put it back. The caller knows that a CHECK_REF_FORMAT_ONELEVEL
451 * error return is Ok for a wildcard refspec.
452 */
453static int verify_refname(char *name, int is_glob)
454{
455 int result;
456
457 result = check_ref_format(name);
458 if (is_glob && result == CHECK_REF_FORMAT_WILDCARD)
459 result = CHECK_REF_FORMAT_OK;
460 return result;
461}
462
463/*
464 * This function frees a refspec array.
465 * Warning: code paths should be checked to ensure that the src
466 * and dst pointers are always freeable pointers as well
467 * as the refspec pointer itself.
468 */
469static void free_refspecs(struct refspec *refspec, int nr_refspec)
470{
471 int i;
472
473 if (!refspec)
474 return;
475
476 for (i = 0; i < nr_refspec; i++) {
477 free(refspec[i].src);
478 free(refspec[i].dst);
479 }
480 free(refspec);
481}
482
483static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
484{
485 int i;
486 int st;
487 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
488
489 for (i = 0; i < nr_refspec; i++) {
490 size_t llen;
491 int is_glob;
492 const char *lhs, *rhs;
493
494 llen = is_glob = 0;
495
496 lhs = refspec[i];
497 if (*lhs == '+') {
498 rs[i].force = 1;
499 lhs++;
500 }
501
502 rhs = strrchr(lhs, ':');
503
504 /*
505 * Before going on, special case ":" (or "+:") as a refspec
506 * for matching refs.
507 */
508 if (!fetch && rhs == lhs && rhs[1] == '\0') {
509 rs[i].matching = 1;
510 continue;
511 }
512
513 if (rhs) {
514 size_t rlen = strlen(++rhs);
515 is_glob = (1 <= rlen && strchr(rhs, '*'));
516 rs[i].dst = xstrndup(rhs, rlen);
517 }
518
519 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
520 if (1 <= llen && memchr(lhs, '*', llen)) {
521 if ((rhs && !is_glob) || (!rhs && fetch))
522 goto invalid;
523 is_glob = 1;
524 } else if (rhs && is_glob) {
525 goto invalid;
526 }
527
528 rs[i].pattern = is_glob;
529 rs[i].src = xstrndup(lhs, llen);
530
531 if (fetch) {
532 /*
533 * LHS
534 * - empty is allowed; it means HEAD.
535 * - otherwise it must be a valid looking ref.
536 */
537 if (!*rs[i].src)
538 ; /* empty is ok */
539 else {
540 st = verify_refname(rs[i].src, is_glob);
541 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
542 goto invalid;
543 }
544 /*
545 * RHS
546 * - missing is ok, and is same as empty.
547 * - empty is ok; it means not to store.
548 * - otherwise it must be a valid looking ref.
549 */
550 if (!rs[i].dst) {
551 ; /* ok */
552 } else if (!*rs[i].dst) {
553 ; /* ok */
554 } else {
555 st = verify_refname(rs[i].dst, is_glob);
556 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
557 goto invalid;
558 }
559 } else {
560 /*
561 * LHS
562 * - empty is allowed; it means delete.
563 * - when wildcarded, it must be a valid looking ref.
564 * - otherwise, it must be an extended SHA-1, but
565 * there is no existing way to validate this.
566 */
567 if (!*rs[i].src)
568 ; /* empty is ok */
569 else if (is_glob) {
570 st = verify_refname(rs[i].src, is_glob);
571 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
572 goto invalid;
573 }
574 else
575 ; /* anything goes, for now */
576 /*
577 * RHS
578 * - missing is allowed, but LHS then must be a
579 * valid looking ref.
580 * - empty is not allowed.
581 * - otherwise it must be a valid looking ref.
582 */
583 if (!rs[i].dst) {
584 st = verify_refname(rs[i].src, is_glob);
585 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
586 goto invalid;
587 } else if (!*rs[i].dst) {
588 goto invalid;
589 } else {
590 st = verify_refname(rs[i].dst, is_glob);
591 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
592 goto invalid;
593 }
594 }
595 }
596 return rs;
597
598 invalid:
599 if (verify) {
600 /*
601 * nr_refspec must be greater than zero and i must be valid
602 * since it is only possible to reach this point from within
603 * the for loop above.
604 */
605 free_refspecs(rs, i+1);
606 return NULL;
607 }
608 die("Invalid refspec '%s'", refspec[i]);
609}
610
611int valid_fetch_refspec(const char *fetch_refspec_str)
612{
613 const char *fetch_refspec[] = { fetch_refspec_str };
614 struct refspec *refspec;
615
616 refspec = parse_refspec_internal(1, fetch_refspec, 1, 1);
617 free_refspecs(refspec, 1);
618 return !!refspec;
619}
620
621struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
622{
623 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
624}
625
626static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
627{
628 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
629}
630
631static int valid_remote_nick(const char *name)
632{
633 if (!name[0] || is_dot_or_dotdot(name))
634 return 0;
635 return !strchr(name, '/'); /* no slash */
636}
637
638struct remote *remote_get(const char *name)
639{
640 struct remote *ret;
641
642 read_config();
643 if (!name)
644 name = default_remote_name;
645 ret = make_remote(name, 0);
646 if (valid_remote_nick(name)) {
647 if (!ret->url)
648 read_remotes_file(ret);
649 if (!ret->url)
650 read_branches_file(ret);
651 }
652 if (!ret->url)
653 add_url_alias(ret, name);
654 if (!ret->url)
655 return NULL;
656 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
657 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
658 return ret;
659}
660
661int for_each_remote(each_remote_fn fn, void *priv)
662{
663 int i, result = 0;
664 read_config();
665 for (i = 0; i < remotes_nr && !result; i++) {
666 struct remote *r = remotes[i];
667 if (!r)
668 continue;
669 if (!r->fetch)
670 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
671 r->fetch_refspec);
672 if (!r->push)
673 r->push = parse_push_refspec(r->push_refspec_nr,
674 r->push_refspec);
675 result = fn(r, priv);
676 }
677 return result;
678}
679
680void ref_remove_duplicates(struct ref *ref_map)
681{
682 struct ref **posn;
683 struct ref *next;
684 for (; ref_map; ref_map = ref_map->next) {
685 if (!ref_map->peer_ref)
686 continue;
687 posn = &ref_map->next;
688 while (*posn) {
689 if ((*posn)->peer_ref &&
690 !strcmp((*posn)->peer_ref->name,
691 ref_map->peer_ref->name)) {
692 if (strcmp((*posn)->name, ref_map->name))
693 die("%s tracks both %s and %s",
694 ref_map->peer_ref->name,
695 (*posn)->name, ref_map->name);
696 next = (*posn)->next;
697 free((*posn)->peer_ref);
698 free(*posn);
699 *posn = next;
700 } else {
701 posn = &(*posn)->next;
702 }
703 }
704 }
705}
706
707int remote_has_url(struct remote *remote, const char *url)
708{
709 int i;
710 for (i = 0; i < remote->url_nr; i++) {
711 if (!strcmp(remote->url[i], url))
712 return 1;
713 }
714 return 0;
715}
716
717static int match_name_with_pattern(const char *key, const char *name,
718 const char *value, char **result)
719{
720 const char *kstar = strchr(key, '*');
721 size_t klen;
722 size_t ksuffixlen;
723 size_t namelen;
724 int ret;
725 if (!kstar)
726 die("Key '%s' of pattern had no '*'", key);
727 klen = kstar - key;
728 ksuffixlen = strlen(kstar + 1);
729 namelen = strlen(name);
730 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
731 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
732 if (ret && value) {
733 const char *vstar = strchr(value, '*');
734 size_t vlen;
735 size_t vsuffixlen;
736 if (!vstar)
737 die("Value '%s' of pattern has no '*'", value);
738 vlen = vstar - value;
739 vsuffixlen = strlen(vstar + 1);
740 *result = xmalloc(vlen + vsuffixlen +
741 strlen(name) -
742 klen - ksuffixlen + 1);
743 strncpy(*result, value, vlen);
744 strncpy(*result + vlen,
745 name + klen, namelen - klen - ksuffixlen);
746 strcpy(*result + vlen + namelen - klen - ksuffixlen,
747 vstar + 1);
748 }
749 return ret;
750}
751
752int remote_find_tracking(struct remote *remote, struct refspec *refspec)
753{
754 int find_src = refspec->src == NULL;
755 char *needle, **result;
756 int i;
757
758 if (find_src) {
759 if (!refspec->dst)
760 return error("find_tracking: need either src or dst");
761 needle = refspec->dst;
762 result = &refspec->src;
763 } else {
764 needle = refspec->src;
765 result = &refspec->dst;
766 }
767
768 for (i = 0; i < remote->fetch_refspec_nr; i++) {
769 struct refspec *fetch = &remote->fetch[i];
770 const char *key = find_src ? fetch->dst : fetch->src;
771 const char *value = find_src ? fetch->src : fetch->dst;
772 if (!fetch->dst)
773 continue;
774 if (fetch->pattern) {
775 if (match_name_with_pattern(key, needle, value, result)) {
776 refspec->force = fetch->force;
777 return 0;
778 }
779 } else if (!strcmp(needle, key)) {
780 *result = xstrdup(value);
781 refspec->force = fetch->force;
782 return 0;
783 }
784 }
785 return -1;
786}
787
788static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
789 const char *name)
790{
791 size_t len = strlen(name);
792 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
793 memcpy(ref->name, prefix, prefixlen);
794 memcpy(ref->name + prefixlen, name, len);
795 return ref;
796}
797
798struct ref *alloc_ref(const char *name)
799{
800 return alloc_ref_with_prefix("", 0, name);
801}
802
803static struct ref *copy_ref(const struct ref *ref)
804{
805 struct ref *cpy;
806 size_t len;
807 if (!ref)
808 return NULL;
809 len = strlen(ref->name);
810 cpy = xmalloc(sizeof(struct ref) + len + 1);
811 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
812 cpy->next = NULL;
813 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
814 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
815 cpy->peer_ref = copy_ref(ref->peer_ref);
816 return cpy;
817}
818
819struct ref *copy_ref_list(const struct ref *ref)
820{
821 struct ref *ret = NULL;
822 struct ref **tail = &ret;
823 while (ref) {
824 *tail = copy_ref(ref);
825 ref = ref->next;
826 tail = &((*tail)->next);
827 }
828 return ret;
829}
830
831static void free_ref(struct ref *ref)
832{
833 if (!ref)
834 return;
835 free_ref(ref->peer_ref);
836 free(ref->remote_status);
837 free(ref->symref);
838 free(ref);
839}
840
841void free_refs(struct ref *ref)
842{
843 struct ref *next;
844 while (ref) {
845 next = ref->next;
846 free_ref(ref);
847 ref = next;
848 }
849}
850
851static int count_refspec_match(const char *pattern,
852 struct ref *refs,
853 struct ref **matched_ref)
854{
855 int patlen = strlen(pattern);
856 struct ref *matched_weak = NULL;
857 struct ref *matched = NULL;
858 int weak_match = 0;
859 int match = 0;
860
861 for (weak_match = match = 0; refs; refs = refs->next) {
862 char *name = refs->name;
863 int namelen = strlen(name);
864
865 if (!refname_match(pattern, name, ref_rev_parse_rules))
866 continue;
867
868 /* A match is "weak" if it is with refs outside
869 * heads or tags, and did not specify the pattern
870 * in full (e.g. "refs/remotes/origin/master") or at
871 * least from the toplevel (e.g. "remotes/origin/master");
872 * otherwise "git push $URL master" would result in
873 * ambiguity between remotes/origin/master and heads/master
874 * at the remote site.
875 */
876 if (namelen != patlen &&
877 patlen != namelen - 5 &&
878 prefixcmp(name, "refs/heads/") &&
879 prefixcmp(name, "refs/tags/")) {
880 /* We want to catch the case where only weak
881 * matches are found and there are multiple
882 * matches, and where more than one strong
883 * matches are found, as ambiguous. One
884 * strong match with zero or more weak matches
885 * are acceptable as a unique match.
886 */
887 matched_weak = refs;
888 weak_match++;
889 }
890 else {
891 matched = refs;
892 match++;
893 }
894 }
895 if (!matched) {
896 *matched_ref = matched_weak;
897 return weak_match;
898 }
899 else {
900 *matched_ref = matched;
901 return match;
902 }
903}
904
905static void tail_link_ref(struct ref *ref, struct ref ***tail)
906{
907 **tail = ref;
908 while (ref->next)
909 ref = ref->next;
910 *tail = &ref->next;
911}
912
913static struct ref *try_explicit_object_name(const char *name)
914{
915 unsigned char sha1[20];
916 struct ref *ref;
917
918 if (!*name) {
919 ref = alloc_ref("(delete)");
920 hashclr(ref->new_sha1);
921 return ref;
922 }
923 if (get_sha1(name, sha1))
924 return NULL;
925 ref = alloc_ref(name);
926 hashcpy(ref->new_sha1, sha1);
927 return ref;
928}
929
930static struct ref *make_linked_ref(const char *name, struct ref ***tail)
931{
932 struct ref *ret = alloc_ref(name);
933 tail_link_ref(ret, tail);
934 return ret;
935}
936
937static char *guess_ref(const char *name, struct ref *peer)
938{
939 struct strbuf buf = STRBUF_INIT;
940 unsigned char sha1[20];
941
942 const char *r = resolve_ref(peer->name, sha1, 1, NULL);
943 if (!r)
944 return NULL;
945
946 if (!prefixcmp(r, "refs/heads/"))
947 strbuf_addstr(&buf, "refs/heads/");
948 else if (!prefixcmp(r, "refs/tags/"))
949 strbuf_addstr(&buf, "refs/tags/");
950 else
951 return NULL;
952
953 strbuf_addstr(&buf, name);
954 return strbuf_detach(&buf, NULL);
955}
956
957static int match_explicit(struct ref *src, struct ref *dst,
958 struct ref ***dst_tail,
959 struct refspec *rs)
960{
961 struct ref *matched_src, *matched_dst;
962 int copy_src;
963
964 const char *dst_value = rs->dst;
965 char *dst_guess;
966
967 if (rs->pattern || rs->matching)
968 return 0;
969
970 matched_src = matched_dst = NULL;
971 switch (count_refspec_match(rs->src, src, &matched_src)) {
972 case 1:
973 copy_src = 1;
974 break;
975 case 0:
976 /* The source could be in the get_sha1() format
977 * not a reference name. :refs/other is a
978 * way to delete 'other' ref at the remote end.
979 */
980 matched_src = try_explicit_object_name(rs->src);
981 if (!matched_src)
982 return error("src refspec %s does not match any.", rs->src);
983 copy_src = 0;
984 break;
985 default:
986 return error("src refspec %s matches more than one.", rs->src);
987 }
988
989 if (!dst_value) {
990 unsigned char sha1[20];
991 int flag;
992
993 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
994 if (!dst_value ||
995 ((flag & REF_ISSYMREF) &&
996 prefixcmp(dst_value, "refs/heads/")))
997 die("%s cannot be resolved to branch.",
998 matched_src->name);
999 }
1000
1001 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1002 case 1:
1003 break;
1004 case 0:
1005 if (!memcmp(dst_value, "refs/", 5))
1006 matched_dst = make_linked_ref(dst_value, dst_tail);
1007 else if((dst_guess = guess_ref(dst_value, matched_src)))
1008 matched_dst = make_linked_ref(dst_guess, dst_tail);
1009 else
1010 error("unable to push to unqualified destination: %s\n"
1011 "The destination refspec neither matches an "
1012 "existing ref on the remote nor\n"
1013 "begins with refs/, and we are unable to "
1014 "guess a prefix based on the source ref.",
1015 dst_value);
1016 break;
1017 default:
1018 matched_dst = NULL;
1019 error("dst refspec %s matches more than one.",
1020 dst_value);
1021 break;
1022 }
1023 if (!matched_dst)
1024 return -1;
1025 if (matched_dst->peer_ref)
1026 return error("dst ref %s receives from more than one src.",
1027 matched_dst->name);
1028 else {
1029 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1030 matched_dst->force = rs->force;
1031 }
1032 return 0;
1033}
1034
1035static int match_explicit_refs(struct ref *src, struct ref *dst,
1036 struct ref ***dst_tail, struct refspec *rs,
1037 int rs_nr)
1038{
1039 int i, errs;
1040 for (i = errs = 0; i < rs_nr; i++)
1041 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1042 return errs;
1043}
1044
1045static const struct refspec *check_pattern_match(const struct refspec *rs,
1046 int rs_nr,
1047 const struct ref *src)
1048{
1049 int i;
1050 int matching_refs = -1;
1051 for (i = 0; i < rs_nr; i++) {
1052 if (rs[i].matching &&
1053 (matching_refs == -1 || rs[i].force)) {
1054 matching_refs = i;
1055 continue;
1056 }
1057
1058 if (rs[i].pattern && match_name_with_pattern(rs[i].src, src->name,
1059 NULL, NULL))
1060 return rs + i;
1061 }
1062 if (matching_refs != -1)
1063 return rs + matching_refs;
1064 else
1065 return NULL;
1066}
1067
1068/*
1069 * Note. This is used only by "push"; refspec matching rules for
1070 * push and fetch are subtly different, so do not try to reuse it
1071 * without thinking.
1072 */
1073int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
1074 int nr_refspec, const char **refspec, int flags)
1075{
1076 struct refspec *rs;
1077 int send_all = flags & MATCH_REFS_ALL;
1078 int send_mirror = flags & MATCH_REFS_MIRROR;
1079 int errs;
1080 static const char *default_refspec[] = { ":", 0 };
1081
1082 if (!nr_refspec) {
1083 nr_refspec = 1;
1084 refspec = default_refspec;
1085 }
1086 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1087 errs = match_explicit_refs(src, dst, dst_tail, rs, nr_refspec);
1088
1089 /* pick the remainder */
1090 for ( ; src; src = src->next) {
1091 struct ref *dst_peer;
1092 const struct refspec *pat = NULL;
1093 char *dst_name;
1094 if (src->peer_ref)
1095 continue;
1096
1097 pat = check_pattern_match(rs, nr_refspec, src);
1098 if (!pat)
1099 continue;
1100
1101 if (pat->matching) {
1102 /*
1103 * "matching refs"; traditionally we pushed everything
1104 * including refs outside refs/heads/ hierarchy, but
1105 * that does not make much sense these days.
1106 */
1107 if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
1108 continue;
1109 dst_name = xstrdup(src->name);
1110
1111 } else {
1112 const char *dst_side = pat->dst ? pat->dst : pat->src;
1113 if (!match_name_with_pattern(pat->src, src->name,
1114 dst_side, &dst_name))
1115 die("Didn't think it matches any more");
1116 }
1117 dst_peer = find_ref_by_name(dst, dst_name);
1118 if (dst_peer) {
1119 if (dst_peer->peer_ref)
1120 /* We're already sending something to this ref. */
1121 goto free_name;
1122
1123 } else {
1124 if (pat->matching && !(send_all || send_mirror))
1125 /*
1126 * Remote doesn't have it, and we have no
1127 * explicit pattern, and we don't have
1128 * --all nor --mirror.
1129 */
1130 goto free_name;
1131
1132 /* Create a new one and link it */
1133 dst_peer = make_linked_ref(dst_name, dst_tail);
1134 hashcpy(dst_peer->new_sha1, src->new_sha1);
1135 }
1136 dst_peer->peer_ref = copy_ref(src);
1137 dst_peer->force = pat->force;
1138 free_name:
1139 free(dst_name);
1140 }
1141 if (errs)
1142 return -1;
1143 return 0;
1144}
1145
1146struct branch *branch_get(const char *name)
1147{
1148 struct branch *ret;
1149
1150 read_config();
1151 if (!name || !*name || !strcmp(name, "HEAD"))
1152 ret = current_branch;
1153 else
1154 ret = make_branch(name, 0);
1155 if (ret && ret->remote_name) {
1156 ret->remote = remote_get(ret->remote_name);
1157 if (ret->merge_nr) {
1158 int i;
1159 ret->merge = xcalloc(sizeof(*ret->merge),
1160 ret->merge_nr);
1161 for (i = 0; i < ret->merge_nr; i++) {
1162 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1163 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1164 remote_find_tracking(ret->remote,
1165 ret->merge[i]);
1166 }
1167 }
1168 }
1169 return ret;
1170}
1171
1172int branch_has_merge_config(struct branch *branch)
1173{
1174 return branch && !!branch->merge;
1175}
1176
1177int branch_merge_matches(struct branch *branch,
1178 int i,
1179 const char *refname)
1180{
1181 if (!branch || i < 0 || i >= branch->merge_nr)
1182 return 0;
1183 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1184}
1185
1186static struct ref *get_expanded_map(const struct ref *remote_refs,
1187 const struct refspec *refspec)
1188{
1189 const struct ref *ref;
1190 struct ref *ret = NULL;
1191 struct ref **tail = &ret;
1192
1193 char *expn_name;
1194
1195 for (ref = remote_refs; ref; ref = ref->next) {
1196 if (strchr(ref->name, '^'))
1197 continue; /* a dereference item */
1198 if (match_name_with_pattern(refspec->src, ref->name,
1199 refspec->dst, &expn_name)) {
1200 struct ref *cpy = copy_ref(ref);
1201
1202 cpy->peer_ref = alloc_ref(expn_name);
1203 free(expn_name);
1204 if (refspec->force)
1205 cpy->peer_ref->force = 1;
1206 *tail = cpy;
1207 tail = &cpy->next;
1208 }
1209 }
1210
1211 return ret;
1212}
1213
1214static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1215{
1216 const struct ref *ref;
1217 for (ref = refs; ref; ref = ref->next) {
1218 if (refname_match(name, ref->name, ref_fetch_rules))
1219 return ref;
1220 }
1221 return NULL;
1222}
1223
1224struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1225{
1226 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1227
1228 if (!ref)
1229 return NULL;
1230
1231 return copy_ref(ref);
1232}
1233
1234static struct ref *get_local_ref(const char *name)
1235{
1236 if (!name)
1237 return NULL;
1238
1239 if (!prefixcmp(name, "refs/"))
1240 return alloc_ref(name);
1241
1242 if (!prefixcmp(name, "heads/") ||
1243 !prefixcmp(name, "tags/") ||
1244 !prefixcmp(name, "remotes/"))
1245 return alloc_ref_with_prefix("refs/", 5, name);
1246
1247 return alloc_ref_with_prefix("refs/heads/", 11, name);
1248}
1249
1250int get_fetch_map(const struct ref *remote_refs,
1251 const struct refspec *refspec,
1252 struct ref ***tail,
1253 int missing_ok)
1254{
1255 struct ref *ref_map, **rmp;
1256
1257 if (refspec->pattern) {
1258 ref_map = get_expanded_map(remote_refs, refspec);
1259 } else {
1260 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1261
1262 ref_map = get_remote_ref(remote_refs, name);
1263 if (!missing_ok && !ref_map)
1264 die("Couldn't find remote ref %s", name);
1265 if (ref_map) {
1266 ref_map->peer_ref = get_local_ref(refspec->dst);
1267 if (ref_map->peer_ref && refspec->force)
1268 ref_map->peer_ref->force = 1;
1269 }
1270 }
1271
1272 for (rmp = &ref_map; *rmp; ) {
1273 if ((*rmp)->peer_ref) {
1274 int st = check_ref_format((*rmp)->peer_ref->name + 5);
1275 if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
1276 struct ref *ignore = *rmp;
1277 error("* Ignoring funny ref '%s' locally",
1278 (*rmp)->peer_ref->name);
1279 *rmp = (*rmp)->next;
1280 free(ignore->peer_ref);
1281 free(ignore);
1282 continue;
1283 }
1284 }
1285 rmp = &((*rmp)->next);
1286 }
1287
1288 if (ref_map)
1289 tail_link_ref(ref_map, tail);
1290
1291 return 0;
1292}
1293
1294int resolve_remote_symref(struct ref *ref, struct ref *list)
1295{
1296 if (!ref->symref)
1297 return 0;
1298 for (; list; list = list->next)
1299 if (!strcmp(ref->symref, list->name)) {
1300 hashcpy(ref->old_sha1, list->old_sha1);
1301 return 0;
1302 }
1303 return 1;
1304}
1305
1306static void unmark_and_free(struct commit_list *list, unsigned int mark)
1307{
1308 while (list) {
1309 struct commit_list *temp = list;
1310 temp->item->object.flags &= ~mark;
1311 list = temp->next;
1312 free(temp);
1313 }
1314}
1315
1316int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1317{
1318 struct object *o;
1319 struct commit *old, *new;
1320 struct commit_list *list, *used;
1321 int found = 0;
1322
1323 /* Both new and old must be commit-ish and new is descendant of
1324 * old. Otherwise we require --force.
1325 */
1326 o = deref_tag(parse_object(old_sha1), NULL, 0);
1327 if (!o || o->type != OBJ_COMMIT)
1328 return 0;
1329 old = (struct commit *) o;
1330
1331 o = deref_tag(parse_object(new_sha1), NULL, 0);
1332 if (!o || o->type != OBJ_COMMIT)
1333 return 0;
1334 new = (struct commit *) o;
1335
1336 if (parse_commit(new) < 0)
1337 return 0;
1338
1339 used = list = NULL;
1340 commit_list_insert(new, &list);
1341 while (list) {
1342 new = pop_most_recent_commit(&list, TMP_MARK);
1343 commit_list_insert(new, &used);
1344 if (new == old) {
1345 found = 1;
1346 break;
1347 }
1348 }
1349 unmark_and_free(list, TMP_MARK);
1350 unmark_and_free(used, TMP_MARK);
1351 return found;
1352}
1353
1354/*
1355 * Return true if there is anything to report, otherwise false.
1356 */
1357int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1358{
1359 unsigned char sha1[20];
1360 struct commit *ours, *theirs;
1361 char symmetric[84];
1362 struct rev_info revs;
1363 const char *rev_argv[10], *base;
1364 int rev_argc;
1365
1366 /*
1367 * Nothing to report unless we are marked to build on top of
1368 * somebody else.
1369 */
1370 if (!branch ||
1371 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1372 return 0;
1373
1374 /*
1375 * If what we used to build on no longer exists, there is
1376 * nothing to report.
1377 */
1378 base = branch->merge[0]->dst;
1379 if (!resolve_ref(base, sha1, 1, NULL))
1380 return 0;
1381 theirs = lookup_commit(sha1);
1382 if (!theirs)
1383 return 0;
1384
1385 if (!resolve_ref(branch->refname, sha1, 1, NULL))
1386 return 0;
1387 ours = lookup_commit(sha1);
1388 if (!ours)
1389 return 0;
1390
1391 /* are we the same? */
1392 if (theirs == ours)
1393 return 0;
1394
1395 /* Run "rev-list --left-right ours...theirs" internally... */
1396 rev_argc = 0;
1397 rev_argv[rev_argc++] = NULL;
1398 rev_argv[rev_argc++] = "--left-right";
1399 rev_argv[rev_argc++] = symmetric;
1400 rev_argv[rev_argc++] = "--";
1401 rev_argv[rev_argc] = NULL;
1402
1403 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1404 strcpy(symmetric + 40, "...");
1405 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1406
1407 init_revisions(&revs, NULL);
1408 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1409 prepare_revision_walk(&revs);
1410
1411 /* ... and count the commits on each side. */
1412 *num_ours = 0;
1413 *num_theirs = 0;
1414 while (1) {
1415 struct commit *c = get_revision(&revs);
1416 if (!c)
1417 break;
1418 if (c->object.flags & SYMMETRIC_LEFT)
1419 (*num_ours)++;
1420 else
1421 (*num_theirs)++;
1422 }
1423
1424 /* clear object flags smudged by the above traversal */
1425 clear_commit_marks(ours, ALL_REV_FLAGS);
1426 clear_commit_marks(theirs, ALL_REV_FLAGS);
1427 return 1;
1428}
1429
1430/*
1431 * Return true when there is anything to report, otherwise false.
1432 */
1433int format_tracking_info(struct branch *branch, struct strbuf *sb)
1434{
1435 int num_ours, num_theirs;
1436 const char *base;
1437
1438 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1439 return 0;
1440
1441 base = branch->merge[0]->dst;
1442 if (!prefixcmp(base, "refs/remotes/")) {
1443 base += strlen("refs/remotes/");
1444 }
1445 if (!num_theirs)
1446 strbuf_addf(sb, "Your branch is ahead of '%s' "
1447 "by %d commit%s.\n",
1448 base, num_ours, (num_ours == 1) ? "" : "s");
1449 else if (!num_ours)
1450 strbuf_addf(sb, "Your branch is behind '%s' "
1451 "by %d commit%s, "
1452 "and can be fast-forwarded.\n",
1453 base, num_theirs, (num_theirs == 1) ? "" : "s");
1454 else
1455 strbuf_addf(sb, "Your branch and '%s' have diverged,\n"
1456 "and have %d and %d different commit(s) each, "
1457 "respectively.\n",
1458 base, num_ours, num_theirs);
1459 return 1;
1460}
1461
1462static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1463{
1464 struct ref ***local_tail = cb_data;
1465 struct ref *ref;
1466 int len;
1467
1468 /* we already know it starts with refs/ to get here */
1469 if (check_ref_format(refname + 5))
1470 return 0;
1471
1472 len = strlen(refname) + 1;
1473 ref = xcalloc(1, sizeof(*ref) + len);
1474 hashcpy(ref->new_sha1, sha1);
1475 memcpy(ref->name, refname, len);
1476 **local_tail = ref;
1477 *local_tail = &ref->next;
1478 return 0;
1479}
1480
1481struct ref *get_local_heads(void)
1482{
1483 struct ref *local_refs, **local_tail = &local_refs;
1484 for_each_ref(one_local_ref, &local_tail);
1485 return local_refs;
1486}
1487
1488struct ref *guess_remote_head(const struct ref *head,
1489 const struct ref *refs,
1490 int all)
1491{
1492 const struct ref *r;
1493 struct ref *list = NULL;
1494 struct ref **tail = &list;
1495
1496 if (!head)
1497 return NULL;
1498
1499 /*
1500 * Some transports support directly peeking at
1501 * where HEAD points; if that is the case, then
1502 * we don't have to guess.
1503 */
1504 if (head->symref)
1505 return copy_ref(find_ref_by_name(refs, head->symref));
1506
1507 /* If refs/heads/master could be right, it is. */
1508 if (!all) {
1509 r = find_ref_by_name(refs, "refs/heads/master");
1510 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1511 return copy_ref(r);
1512 }
1513
1514 /* Look for another ref that points there */
1515 for (r = refs; r; r = r->next) {
1516 if (r != head && !hashcmp(r->old_sha1, head->old_sha1)) {
1517 *tail = copy_ref(r);
1518 tail = &((*tail)->next);
1519 if (!all)
1520 break;
1521 }
1522 }
1523
1524 return list;
1525}