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 if (*name == '/') {
345 warning("Config remote shorthand cannot begin with '/': %s",
346 name);
347 return 0;
348 }
349 subkey = strrchr(name, '.');
350 if (!subkey)
351 return error("Config with no key for remote %s", name);
352 remote = make_remote(name, subkey - name);
353 if (!strcmp(subkey, ".mirror"))
354 remote->mirror = git_config_bool(key, value);
355 else if (!strcmp(subkey, ".skipdefaultupdate"))
356 remote->skip_default_update = git_config_bool(key, value);
357 else if (!strcmp(subkey, ".url")) {
359 const char *v;
360 if (git_config_string(&v, key, value))
361 return -1;
362 add_url(remote, v);
363 } else if (!strcmp(subkey, ".push")) {
364 const char *v;
365 if (git_config_string(&v, key, value))
366 return -1;
367 add_push_refspec(remote, v);
368 } else if (!strcmp(subkey, ".fetch")) {
369 const char *v;
370 if (git_config_string(&v, key, value))
371 return -1;
372 add_fetch_refspec(remote, v);
373 } else if (!strcmp(subkey, ".receivepack")) {
374 const char *v;
375 if (git_config_string(&v, key, value))
376 return -1;
377 if (!remote->receivepack)
378 remote->receivepack = v;
379 else
380 error("more than one receivepack given, using the first");
381 } else if (!strcmp(subkey, ".uploadpack")) {
382 const char *v;
383 if (git_config_string(&v, key, value))
384 return -1;
385 if (!remote->uploadpack)
386 remote->uploadpack = v;
387 else
388 error("more than one uploadpack given, using the first");
389 } else if (!strcmp(subkey, ".tagopt")) {
390 if (!strcmp(value, "--no-tags"))
391 remote->fetch_tags = -1;
392 } else if (!strcmp(subkey, ".proxy")) {
393 return git_config_string((const char **)&remote->http_proxy,
394 key, value);
395 }
396 return 0;
397}
398static void alias_all_urls(void)
400{
401 int i, j;
402 for (i = 0; i < remotes_nr; i++) {
403 if (!remotes[i])
404 continue;
405 for (j = 0; j < remotes[i]->url_nr; j++) {
406 remotes[i]->url[j] = alias_url(remotes[i]->url[j]);
407 }
408 }
409}
410static void read_config(void)
412{
413 unsigned char sha1[20];
414 const char *head_ref;
415 int flag;
416 if (default_remote_name) // did this already
417 return;
418 default_remote_name = xstrdup("origin");
419 current_branch = NULL;
420 head_ref = resolve_ref("HEAD", sha1, 0, &flag);
421 if (head_ref && (flag & REF_ISSYMREF) &&
422 !prefixcmp(head_ref, "refs/heads/")) {
423 current_branch =
424 make_branch(head_ref + strlen("refs/heads/"), 0);
425 }
426 git_config(handle_config, NULL);
427 alias_all_urls();
428}
429/*
431 * We need to make sure the tracking branches are well formed, but a
432 * wildcard refspec in "struct refspec" must have a trailing slash. We
433 * temporarily drop the trailing '/' while calling check_ref_format(),
434 * and put it back. The caller knows that a CHECK_REF_FORMAT_ONELEVEL
435 * error return is Ok for a wildcard refspec.
436 */
437static int verify_refname(char *name, int is_glob)
438{
439 int result, len = -1;
440 if (is_glob) {
442 len = strlen(name);
443 assert(name[len - 1] == '/');
444 name[len - 1] = '\0';
445 }
446 result = check_ref_format(name);
447 if (is_glob)
448 name[len - 1] = '/';
449 return result;
450}
451/*
453 * This function frees a refspec array.
454 * Warning: code paths should be checked to ensure that the src
455 * and dst pointers are always freeable pointers as well
456 * as the refspec pointer itself.
457 */
458static void free_refspecs(struct refspec *refspec, int nr_refspec)
459{
460 int i;
461 if (!refspec)
463 return;
464 for (i = 0; i < nr_refspec; i++) {
466 free(refspec[i].src);
467 free(refspec[i].dst);
468 }
469 free(refspec);
470}
471static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
473{
474 int i;
475 int st;
476 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
477 for (i = 0; i < nr_refspec; i++) {
479 size_t llen;
480 int is_glob;
481 const char *lhs, *rhs;
482 llen = is_glob = 0;
484 lhs = refspec[i];
486 if (*lhs == '+') {
487 rs[i].force = 1;
488 lhs++;
489 }
490 rhs = strrchr(lhs, ':');
492 /*
494 * Before going on, special case ":" (or "+:") as a refspec
495 * for matching refs.
496 */
497 if (!fetch && rhs == lhs && rhs[1] == '\0') {
498 rs[i].matching = 1;
499 continue;
500 }
501 if (rhs) {
503 size_t rlen = strlen(++rhs);
504 is_glob = (2 <= rlen && !strcmp(rhs + rlen - 2, "/*"));
505 rs[i].dst = xstrndup(rhs, rlen - is_glob);
506 }
507 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
509 if (2 <= llen && !memcmp(lhs + llen - 2, "/*", 2)) {
510 if ((rhs && !is_glob) || (!rhs && fetch))
511 goto invalid;
512 is_glob = 1;
513 llen--;
514 } else if (rhs && is_glob) {
515 goto invalid;
516 }
517 rs[i].pattern = is_glob;
519 rs[i].src = xstrndup(lhs, llen);
520 if (fetch) {
522 /*
523 * LHS
524 * - empty is allowed; it means HEAD.
525 * - otherwise it must be a valid looking ref.
526 */
527 if (!*rs[i].src)
528 ; /* empty is ok */
529 else {
530 st = verify_refname(rs[i].src, is_glob);
531 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
532 goto invalid;
533 }
534 /*
535 * RHS
536 * - missing is ok, and is same as empty.
537 * - empty is ok; it means not to store.
538 * - otherwise it must be a valid looking ref.
539 */
540 if (!rs[i].dst) {
541 ; /* ok */
542 } else if (!*rs[i].dst) {
543 ; /* ok */
544 } else {
545 st = verify_refname(rs[i].dst, is_glob);
546 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
547 goto invalid;
548 }
549 } else {
550 /*
551 * LHS
552 * - empty is allowed; it means delete.
553 * - when wildcarded, it must be a valid looking ref.
554 * - otherwise, it must be an extended SHA-1, but
555 * there is no existing way to validate this.
556 */
557 if (!*rs[i].src)
558 ; /* empty is ok */
559 else if (is_glob) {
560 st = verify_refname(rs[i].src, is_glob);
561 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
562 goto invalid;
563 }
564 else
565 ; /* anything goes, for now */
566 /*
567 * RHS
568 * - missing is allowed, but LHS then must be a
569 * valid looking ref.
570 * - empty is not allowed.
571 * - otherwise it must be a valid looking ref.
572 */
573 if (!rs[i].dst) {
574 st = verify_refname(rs[i].src, is_glob);
575 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
576 goto invalid;
577 } else if (!*rs[i].dst) {
578 goto invalid;
579 } else {
580 st = verify_refname(rs[i].dst, is_glob);
581 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
582 goto invalid;
583 }
584 }
585 }
586 return rs;
587 invalid:
589 if (verify) {
590 /*
591 * nr_refspec must be greater than zero and i must be valid
592 * since it is only possible to reach this point from within
593 * the for loop above.
594 */
595 free_refspecs(rs, i+1);
596 return NULL;
597 }
598 die("Invalid refspec '%s'", refspec[i]);
599}
600int valid_fetch_refspec(const char *fetch_refspec_str)
602{
603 const char *fetch_refspec[] = { fetch_refspec_str };
604 struct refspec *refspec;
605 refspec = parse_refspec_internal(1, fetch_refspec, 1, 1);
607 free_refspecs(refspec, 1);
608 return !!refspec;
609}
610struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
612{
613 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
614}
615static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
617{
618 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
619}
620static int valid_remote_nick(const char *name)
622{
623 if (!name[0] || /* not empty */
624 (name[0] == '.' && /* not "." */
625 (!name[1] || /* not ".." */
626 (name[1] == '.' && !name[2]))))
627 return 0;
628 return !strchr(name, '/'); /* no slash */
629}
630struct remote *remote_get(const char *name)
632{
633 struct remote *ret;
634 read_config();
636 if (!name)
637 name = default_remote_name;
638 ret = make_remote(name, 0);
639 if (valid_remote_nick(name)) {
640 if (!ret->url)
641 read_remotes_file(ret);
642 if (!ret->url)
643 read_branches_file(ret);
644 }
645 if (!ret->url)
646 add_url_alias(ret, name);
647 if (!ret->url)
648 return NULL;
649 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
650 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
651 return ret;
652}
653int for_each_remote(each_remote_fn fn, void *priv)
655{
656 int i, result = 0;
657 read_config();
658 for (i = 0; i < remotes_nr && !result; i++) {
659 struct remote *r = remotes[i];
660 if (!r)
661 continue;
662 if (!r->fetch)
663 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
664 r->fetch_refspec);
665 if (!r->push)
666 r->push = parse_push_refspec(r->push_refspec_nr,
667 r->push_refspec);
668 result = fn(r, priv);
669 }
670 return result;
671}
672void ref_remove_duplicates(struct ref *ref_map)
674{
675 struct ref **posn;
676 struct ref *next;
677 for (; ref_map; ref_map = ref_map->next) {
678 if (!ref_map->peer_ref)
679 continue;
680 posn = &ref_map->next;
681 while (*posn) {
682 if ((*posn)->peer_ref &&
683 !strcmp((*posn)->peer_ref->name,
684 ref_map->peer_ref->name)) {
685 if (strcmp((*posn)->name, ref_map->name))
686 die("%s tracks both %s and %s",
687 ref_map->peer_ref->name,
688 (*posn)->name, ref_map->name);
689 next = (*posn)->next;
690 free((*posn)->peer_ref);
691 free(*posn);
692 *posn = next;
693 } else {
694 posn = &(*posn)->next;
695 }
696 }
697 }
698}
699int remote_has_url(struct remote *remote, const char *url)
701{
702 int i;
703 for (i = 0; i < remote->url_nr; i++) {
704 if (!strcmp(remote->url[i], url))
705 return 1;
706 }
707 return 0;
708}
709int remote_find_tracking(struct remote *remote, struct refspec *refspec)
711{
712 int find_src = refspec->src == NULL;
713 char *needle, **result;
714 int i;
715 if (find_src) {
717 if (!refspec->dst)
718 return error("find_tracking: need either src or dst");
719 needle = refspec->dst;
720 result = &refspec->src;
721 } else {
722 needle = refspec->src;
723 result = &refspec->dst;
724 }
725 for (i = 0; i < remote->fetch_refspec_nr; i++) {
727 struct refspec *fetch = &remote->fetch[i];
728 const char *key = find_src ? fetch->dst : fetch->src;
729 const char *value = find_src ? fetch->src : fetch->dst;
730 if (!fetch->dst)
731 continue;
732 if (fetch->pattern) {
733 if (!prefixcmp(needle, key)) {
734 *result = xmalloc(strlen(value) +
735 strlen(needle) -
736 strlen(key) + 1);
737 strcpy(*result, value);
738 strcpy(*result + strlen(value),
739 needle + strlen(key));
740 refspec->force = fetch->force;
741 return 0;
742 }
743 } else if (!strcmp(needle, key)) {
744 *result = xstrdup(value);
745 refspec->force = fetch->force;
746 return 0;
747 }
748 }
749 return -1;
750}
751struct ref *alloc_ref(unsigned namelen)
753{
754 struct ref *ret = xcalloc(1, sizeof(struct ref) + namelen);
755 return ret;
756}
757struct ref *alloc_ref_from_str(const char* str)
759{
760 struct ref *ret = alloc_ref(strlen(str) + 1);
761 strcpy(ret->name, str);
762 return ret;
763}
764static struct ref *copy_ref(const struct ref *ref)
766{
767 struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
768 memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
769 ret->next = NULL;
770 return ret;
771}
772struct ref *copy_ref_list(const struct ref *ref)
774{
775 struct ref *ret = NULL;
776 struct ref **tail = &ret;
777 while (ref) {
778 *tail = copy_ref(ref);
779 ref = ref->next;
780 tail = &((*tail)->next);
781 }
782 return ret;
783}
784static void free_ref(struct ref *ref)
786{
787 if (!ref)
788 return;
789 free(ref->remote_status);
790 free(ref->symref);
791 free(ref);
792}
793void free_refs(struct ref *ref)
795{
796 struct ref *next;
797 while (ref) {
798 next = ref->next;
799 free(ref->peer_ref);
800 free_ref(ref);
801 ref = next;
802 }
803}
804static int count_refspec_match(const char *pattern,
806 struct ref *refs,
807 struct ref **matched_ref)
808{
809 int patlen = strlen(pattern);
810 struct ref *matched_weak = NULL;
811 struct ref *matched = NULL;
812 int weak_match = 0;
813 int match = 0;
814 for (weak_match = match = 0; refs; refs = refs->next) {
816 char *name = refs->name;
817 int namelen = strlen(name);
818 if (!refname_match(pattern, name, ref_rev_parse_rules))
820 continue;
821 /* A match is "weak" if it is with refs outside
823 * heads or tags, and did not specify the pattern
824 * in full (e.g. "refs/remotes/origin/master") or at
825 * least from the toplevel (e.g. "remotes/origin/master");
826 * otherwise "git push $URL master" would result in
827 * ambiguity between remotes/origin/master and heads/master
828 * at the remote site.
829 */
830 if (namelen != patlen &&
831 patlen != namelen - 5 &&
832 prefixcmp(name, "refs/heads/") &&
833 prefixcmp(name, "refs/tags/")) {
834 /* We want to catch the case where only weak
835 * matches are found and there are multiple
836 * matches, and where more than one strong
837 * matches are found, as ambiguous. One
838 * strong match with zero or more weak matches
839 * are acceptable as a unique match.
840 */
841 matched_weak = refs;
842 weak_match++;
843 }
844 else {
845 matched = refs;
846 match++;
847 }
848 }
849 if (!matched) {
850 *matched_ref = matched_weak;
851 return weak_match;
852 }
853 else {
854 *matched_ref = matched;
855 return match;
856 }
857}
858static void tail_link_ref(struct ref *ref, struct ref ***tail)
860{
861 **tail = ref;
862 while (ref->next)
863 ref = ref->next;
864 *tail = &ref->next;
865}
866static struct ref *try_explicit_object_name(const char *name)
868{
869 unsigned char sha1[20];
870 struct ref *ref;
871 if (!*name) {
873 ref = alloc_ref(20);
874 strcpy(ref->name, "(delete)");
875 hashclr(ref->new_sha1);
876 return ref;
877 }
878 if (get_sha1(name, sha1))
879 return NULL;
880 ref = alloc_ref_from_str(name);
881 hashcpy(ref->new_sha1, sha1);
882 return ref;
883}
884static struct ref *make_linked_ref(const char *name, struct ref ***tail)
886{
887 struct ref *ret = alloc_ref_from_str(name);
888 tail_link_ref(ret, tail);
889 return ret;
890}
891static char *guess_ref(const char *name, struct ref *peer)
893{
894 struct strbuf buf = STRBUF_INIT;
895 unsigned char sha1[20];
896 const char *r = resolve_ref(peer->name, sha1, 1, NULL);
898 if (!r)
899 return NULL;
900 if (!prefixcmp(r, "refs/heads/"))
902 strbuf_addstr(&buf, "refs/heads/");
903 else if (!prefixcmp(r, "refs/tags/"))
904 strbuf_addstr(&buf, "refs/tags/");
905 else
906 return NULL;
907 strbuf_addstr(&buf, name);
909 return strbuf_detach(&buf, NULL);
910}
911static int match_explicit(struct ref *src, struct ref *dst,
913 struct ref ***dst_tail,
914 struct refspec *rs)
915{
916 struct ref *matched_src, *matched_dst;
917 const char *dst_value = rs->dst;
919 char *dst_guess;
920 if (rs->pattern || rs->matching)
922 return 0;
923 matched_src = matched_dst = NULL;
925 switch (count_refspec_match(rs->src, src, &matched_src)) {
926 case 1:
927 break;
928 case 0:
929 /* The source could be in the get_sha1() format
930 * not a reference name. :refs/other is a
931 * way to delete 'other' ref at the remote end.
932 */
933 matched_src = try_explicit_object_name(rs->src);
934 if (!matched_src)
935 return error("src refspec %s does not match any.", rs->src);
936 break;
937 default:
938 return error("src refspec %s matches more than one.", rs->src);
939 }
940 if (!dst_value) {
942 unsigned char sha1[20];
943 int flag;
944 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
946 if (!dst_value ||
947 ((flag & REF_ISSYMREF) &&
948 prefixcmp(dst_value, "refs/heads/")))
949 die("%s cannot be resolved to branch.",
950 matched_src->name);
951 }
952 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
954 case 1:
955 break;
956 case 0:
957 if (!memcmp(dst_value, "refs/", 5))
958 matched_dst = make_linked_ref(dst_value, dst_tail);
959 else if((dst_guess = guess_ref(dst_value, matched_src)))
960 matched_dst = make_linked_ref(dst_guess, dst_tail);
961 else
962 error("unable to push to unqualified destination: %s\n"
963 "The destination refspec neither matches an "
964 "existing ref on the remote nor\n"
965 "begins with refs/, and we are unable to "
966 "guess a prefix based on the source ref.",
967 dst_value);
968 break;
969 default:
970 matched_dst = NULL;
971 error("dst refspec %s matches more than one.",
972 dst_value);
973 break;
974 }
975 if (!matched_dst)
976 return -1;
977 if (matched_dst->peer_ref)
978 return error("dst ref %s receives from more than one src.",
979 matched_dst->name);
980 else {
981 matched_dst->peer_ref = matched_src;
982 matched_dst->force = rs->force;
983 }
984 return 0;
985}
986static int match_explicit_refs(struct ref *src, struct ref *dst,
988 struct ref ***dst_tail, struct refspec *rs,
989 int rs_nr)
990{
991 int i, errs;
992 for (i = errs = 0; i < rs_nr; i++)
993 errs += match_explicit(src, dst, dst_tail, &rs[i]);
994 return errs;
995}
996static const struct refspec *check_pattern_match(const struct refspec *rs,
998 int rs_nr,
999 const struct ref *src)
1000{
1001 int i;
1002 int matching_refs = -1;
1003 for (i = 0; i < rs_nr; i++) {
1004 if (rs[i].matching &&
1005 (matching_refs == -1 || rs[i].force)) {
1006 matching_refs = i;
1007 continue;
1008 }
1009 if (rs[i].pattern && !prefixcmp(src->name, rs[i].src))
1011 return rs + i;
1012 }
1013 if (matching_refs != -1)
1014 return rs + matching_refs;
1015 else
1016 return NULL;
1017}
1018/*
1020 * Note. This is used only by "push"; refspec matching rules for
1021 * push and fetch are subtly different, so do not try to reuse it
1022 * without thinking.
1023 */
1024int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
1025 int nr_refspec, const char **refspec, int flags)
1026{
1027 struct refspec *rs;
1028 int send_all = flags & MATCH_REFS_ALL;
1029 int send_mirror = flags & MATCH_REFS_MIRROR;
1030 static const char *default_refspec[] = { ":", 0 };
1031 if (!nr_refspec) {
1033 nr_refspec = 1;
1034 refspec = default_refspec;
1035 }
1036 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1037 if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
1038 return -1;
1039 /* pick the remainder */
1041 for ( ; src; src = src->next) {
1042 struct ref *dst_peer;
1043 const struct refspec *pat = NULL;
1044 char *dst_name;
1045 if (src->peer_ref)
1046 continue;
1047 pat = check_pattern_match(rs, nr_refspec, src);
1049 if (!pat)
1050 continue;
1051 if (pat->matching) {
1053 /*
1054 * "matching refs"; traditionally we pushed everything
1055 * including refs outside refs/heads/ hierarchy, but
1056 * that does not make much sense these days.
1057 */
1058 if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
1059 continue;
1060 dst_name = xstrdup(src->name);
1061 } else {
1063 const char *dst_side = pat->dst ? pat->dst : pat->src;
1064 dst_name = xmalloc(strlen(dst_side) +
1065 strlen(src->name) -
1066 strlen(pat->src) + 2);
1067 strcpy(dst_name, dst_side);
1068 strcat(dst_name, src->name + strlen(pat->src));
1069 }
1070 dst_peer = find_ref_by_name(dst, dst_name);
1071 if (dst_peer) {
1072 if (dst_peer->peer_ref)
1073 /* We're already sending something to this ref. */
1074 goto free_name;
1075 } else {
1077 if (pat->matching && !(send_all || send_mirror))
1078 /*
1079 * Remote doesn't have it, and we have no
1080 * explicit pattern, and we don't have
1081 * --all nor --mirror.
1082 */
1083 goto free_name;
1084 /* Create a new one and link it */
1086 dst_peer = make_linked_ref(dst_name, dst_tail);
1087 hashcpy(dst_peer->new_sha1, src->new_sha1);
1088 }
1089 dst_peer->peer_ref = src;
1090 dst_peer->force = pat->force;
1091 free_name:
1092 free(dst_name);
1093 }
1094 return 0;
1095}
1096struct branch *branch_get(const char *name)
1098{
1099 struct branch *ret;
1100 read_config();
1102 if (!name || !*name || !strcmp(name, "HEAD"))
1103 ret = current_branch;
1104 else
1105 ret = make_branch(name, 0);
1106 if (ret && ret->remote_name) {
1107 ret->remote = remote_get(ret->remote_name);
1108 if (ret->merge_nr) {
1109 int i;
1110 ret->merge = xcalloc(sizeof(*ret->merge),
1111 ret->merge_nr);
1112 for (i = 0; i < ret->merge_nr; i++) {
1113 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1114 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1115 remote_find_tracking(ret->remote,
1116 ret->merge[i]);
1117 }
1118 }
1119 }
1120 return ret;
1121}
1122int branch_has_merge_config(struct branch *branch)
1124{
1125 return branch && !!branch->merge;
1126}
1127int branch_merge_matches(struct branch *branch,
1129 int i,
1130 const char *refname)
1131{
1132 if (!branch || i < 0 || i >= branch->merge_nr)
1133 return 0;
1134 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1135}
1136static struct ref *get_expanded_map(const struct ref *remote_refs,
1138 const struct refspec *refspec)
1139{
1140 const struct ref *ref;
1141 struct ref *ret = NULL;
1142 struct ref **tail = &ret;
1143 int remote_prefix_len = strlen(refspec->src);
1145 int local_prefix_len = strlen(refspec->dst);
1146 for (ref = remote_refs; ref; ref = ref->next) {
1148 if (strchr(ref->name, '^'))
1149 continue; /* a dereference item */
1150 if (!prefixcmp(ref->name, refspec->src)) {
1151 const char *match;
1152 struct ref *cpy = copy_ref(ref);
1153 match = ref->name + remote_prefix_len;
1154 cpy->peer_ref = alloc_ref(local_prefix_len +
1156 strlen(match) + 1);
1157 sprintf(cpy->peer_ref->name, "%s%s",
1158 refspec->dst, match);
1159 if (refspec->force)
1160 cpy->peer_ref->force = 1;
1161 *tail = cpy;
1162 tail = &cpy->next;
1163 }
1164 }
1165 return ret;
1167}
1168static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1170{
1171 const struct ref *ref;
1172 for (ref = refs; ref; ref = ref->next) {
1173 if (refname_match(name, ref->name, ref_fetch_rules))
1174 return ref;
1175 }
1176 return NULL;
1177}
1178struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1180{
1181 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1182 if (!ref)
1184 return NULL;
1185 return copy_ref(ref);
1187}
1188static struct ref *get_local_ref(const char *name)
1190{
1191 struct ref *ret;
1192 if (!name)
1193 return NULL;
1194 if (!prefixcmp(name, "refs/")) {
1196 return alloc_ref_from_str(name);
1197 }
1198 if (!prefixcmp(name, "heads/") ||
1200 !prefixcmp(name, "tags/") ||
1201 !prefixcmp(name, "remotes/")) {
1202 ret = alloc_ref(strlen(name) + 6);
1203 sprintf(ret->name, "refs/%s", name);
1204 return ret;
1205 }
1206 ret = alloc_ref(strlen(name) + 12);
1208 sprintf(ret->name, "refs/heads/%s", name);
1209 return ret;
1210}
1211int get_fetch_map(const struct ref *remote_refs,
1213 const struct refspec *refspec,
1214 struct ref ***tail,
1215 int missing_ok)
1216{
1217 struct ref *ref_map, **rmp;
1218 if (refspec->pattern) {
1220 ref_map = get_expanded_map(remote_refs, refspec);
1221 } else {
1222 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1223 ref_map = get_remote_ref(remote_refs, name);
1225 if (!missing_ok && !ref_map)
1226 die("Couldn't find remote ref %s", name);
1227 if (ref_map) {
1228 ref_map->peer_ref = get_local_ref(refspec->dst);
1229 if (ref_map->peer_ref && refspec->force)
1230 ref_map->peer_ref->force = 1;
1231 }
1232 }
1233 for (rmp = &ref_map; *rmp; ) {
1235 if ((*rmp)->peer_ref) {
1236 int st = check_ref_format((*rmp)->peer_ref->name + 5);
1237 if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
1238 struct ref *ignore = *rmp;
1239 error("* Ignoring funny ref '%s' locally",
1240 (*rmp)->peer_ref->name);
1241 *rmp = (*rmp)->next;
1242 free(ignore->peer_ref);
1243 free(ignore);
1244 continue;
1245 }
1246 }
1247 rmp = &((*rmp)->next);
1248 }
1249 if (ref_map)
1251 tail_link_ref(ref_map, tail);
1252 return 0;
1254}
1255int resolve_remote_symref(struct ref *ref, struct ref *list)
1257{
1258 if (!ref->symref)
1259 return 0;
1260 for (; list; list = list->next)
1261 if (!strcmp(ref->symref, list->name)) {
1262 hashcpy(ref->old_sha1, list->old_sha1);
1263 return 0;
1264 }
1265 return 1;
1266}
1267/*
1269 * Return true if there is anything to report, otherwise false.
1270 */
1271int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1272{
1273 unsigned char sha1[20];
1274 struct commit *ours, *theirs;
1275 char symmetric[84];
1276 struct rev_info revs;
1277 const char *rev_argv[10], *base;
1278 int rev_argc;
1279 /*
1281 * Nothing to report unless we are marked to build on top of
1282 * somebody else.
1283 */
1284 if (!branch ||
1285 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1286 return 0;
1287 /*
1289 * If what we used to build on no longer exists, there is
1290 * nothing to report.
1291 */
1292 base = branch->merge[0]->dst;
1293 if (!resolve_ref(base, sha1, 1, NULL))
1294 return 0;
1295 theirs = lookup_commit(sha1);
1296 if (!theirs)
1297 return 0;
1298 if (!resolve_ref(branch->refname, sha1, 1, NULL))
1300 return 0;
1301 ours = lookup_commit(sha1);
1302 if (!ours)
1303 return 0;
1304 /* are we the same? */
1306 if (theirs == ours)
1307 return 0;
1308 /* Run "rev-list --left-right ours...theirs" internally... */
1310 rev_argc = 0;
1311 rev_argv[rev_argc++] = NULL;
1312 rev_argv[rev_argc++] = "--left-right";
1313 rev_argv[rev_argc++] = symmetric;
1314 rev_argv[rev_argc++] = "--";
1315 rev_argv[rev_argc] = NULL;
1316 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1318 strcpy(symmetric + 40, "...");
1319 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1320 init_revisions(&revs, NULL);
1322 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1323 prepare_revision_walk(&revs);
1324 /* ... and count the commits on each side. */
1326 *num_ours = 0;
1327 *num_theirs = 0;
1328 while (1) {
1329 struct commit *c = get_revision(&revs);
1330 if (!c)
1331 break;
1332 if (c->object.flags & SYMMETRIC_LEFT)
1333 (*num_ours)++;
1334 else
1335 (*num_theirs)++;
1336 }
1337 /* clear object flags smudged by the above traversal */
1339 clear_commit_marks(ours, ALL_REV_FLAGS);
1340 clear_commit_marks(theirs, ALL_REV_FLAGS);
1341 return 1;
1342}
1343/*
1345 * Return true when there is anything to report, otherwise false.
1346 */
1347int format_tracking_info(struct branch *branch, struct strbuf *sb)
1348{
1349 int num_ours, num_theirs;
1350 const char *base;
1351 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1353 return 0;
1354 base = branch->merge[0]->dst;
1356 if (!prefixcmp(base, "refs/remotes/")) {
1357 base += strlen("refs/remotes/");
1358 }
1359 if (!num_theirs)
1360 strbuf_addf(sb, "Your branch is ahead of '%s' "
1361 "by %d commit%s.\n",
1362 base, num_ours, (num_ours == 1) ? "" : "s");
1363 else if (!num_ours)
1364 strbuf_addf(sb, "Your branch is behind '%s' "
1365 "by %d commit%s, "
1366 "and can be fast-forwarded.\n",
1367 base, num_theirs, (num_theirs == 1) ? "" : "s");
1368 else
1369 strbuf_addf(sb, "Your branch and '%s' have diverged,\n"
1370 "and have %d and %d different commit(s) each, "
1371 "respectively.\n",
1372 base, num_ours, num_theirs);
1373 return 1;
1374}