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