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#include "string-list.h"
10#include "mergesort.h"
11enum map_direction { FROM_SRC, FROM_DST };
13static struct refspec s_tag_refspec = {
15 0,
16 1,
17 0,
18 0,
19 "refs/tags/*",
20 "refs/tags/*"
21};
22const struct refspec *tag_refspec = &s_tag_refspec;
24struct counted_string {
26 size_t len;
27 const char *s;
28};
29struct rewrite {
30 const char *base;
31 size_t baselen;
32 struct counted_string *instead_of;
33 int instead_of_nr;
34 int instead_of_alloc;
35};
36struct rewrites {
37 struct rewrite **rewrite;
38 int rewrite_alloc;
39 int rewrite_nr;
40};
41static struct remote **remotes;
43static int remotes_alloc;
44static int remotes_nr;
45static struct branch **branches;
47static int branches_alloc;
48static int branches_nr;
49static struct branch *current_branch;
51static const char *default_remote_name;
52static const char *pushremote_name;
53static int explicit_default_remote_name;
54static struct rewrites rewrites;
56static struct rewrites rewrites_push;
57#define BUF_SIZE (2048)
59static char buffer[BUF_SIZE];
60static int valid_remote(const struct remote *remote)
62{
63 return (!!remote->url) || (!!remote->foreign_vcs);
64}
65static const char *alias_url(const char *url, struct rewrites *r)
67{
68 int i, j;
69 char *ret;
70 struct counted_string *longest;
71 int longest_i;
72 longest = NULL;
74 longest_i = -1;
75 for (i = 0; i < r->rewrite_nr; i++) {
76 if (!r->rewrite[i])
77 continue;
78 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
79 if (!prefixcmp(url, r->rewrite[i]->instead_of[j].s) &&
80 (!longest ||
81 longest->len < r->rewrite[i]->instead_of[j].len)) {
82 longest = &(r->rewrite[i]->instead_of[j]);
83 longest_i = i;
84 }
85 }
86 }
87 if (!longest)
88 return url;
89 ret = xmalloc(r->rewrite[longest_i]->baselen +
91 (strlen(url) - longest->len) + 1);
92 strcpy(ret, r->rewrite[longest_i]->base);
93 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
94 return ret;
95}
96static void add_push_refspec(struct remote *remote, const char *ref)
98{
99 ALLOC_GROW(remote->push_refspec,
100 remote->push_refspec_nr + 1,
101 remote->push_refspec_alloc);
102 remote->push_refspec[remote->push_refspec_nr++] = ref;
103}
104static void add_fetch_refspec(struct remote *remote, const char *ref)
106{
107 ALLOC_GROW(remote->fetch_refspec,
108 remote->fetch_refspec_nr + 1,
109 remote->fetch_refspec_alloc);
110 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
111}
112static void add_url(struct remote *remote, const char *url)
114{
115 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
116 remote->url[remote->url_nr++] = url;
117}
118static void add_pushurl(struct remote *remote, const char *pushurl)
120{
121 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
122 remote->pushurl[remote->pushurl_nr++] = pushurl;
123}
124static void add_pushurl_alias(struct remote *remote, const char *url)
126{
127 const char *pushurl = alias_url(url, &rewrites_push);
128 if (pushurl != url)
129 add_pushurl(remote, pushurl);
130}
131static void add_url_alias(struct remote *remote, const char *url)
133{
134 add_url(remote, alias_url(url, &rewrites));
135 add_pushurl_alias(remote, url);
136}
137static struct remote *make_remote(const char *name, int len)
139{
140 struct remote *ret;
141 int i;
142 for (i = 0; i < remotes_nr; i++) {
144 if (len ? (!strncmp(name, remotes[i]->name, len) &&
145 !remotes[i]->name[len]) :
146 !strcmp(name, remotes[i]->name))
147 return remotes[i];
148 }
149 ret = xcalloc(1, sizeof(struct remote));
151 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
152 remotes[remotes_nr++] = ret;
153 if (len)
154 ret->name = xstrndup(name, len);
155 else
156 ret->name = xstrdup(name);
157 return ret;
158}
159static void add_merge(struct branch *branch, const char *name)
161{
162 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
163 branch->merge_alloc);
164 branch->merge_name[branch->merge_nr++] = name;
165}
166static struct branch *make_branch(const char *name, int len)
168{
169 struct branch *ret;
170 int i;
171 char *refname;
172 for (i = 0; i < branches_nr; i++) {
174 if (len ? (!strncmp(name, branches[i]->name, len) &&
175 !branches[i]->name[len]) :
176 !strcmp(name, branches[i]->name))
177 return branches[i];
178 }
179 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
181 ret = xcalloc(1, sizeof(struct branch));
182 branches[branches_nr++] = ret;
183 if (len)
184 ret->name = xstrndup(name, len);
185 else
186 ret->name = xstrdup(name);
187 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
188 strcpy(refname, "refs/heads/");
189 strcpy(refname + strlen("refs/heads/"), ret->name);
190 ret->refname = refname;
191 return ret;
193}
194static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
196{
197 struct rewrite *ret;
198 int i;
199 for (i = 0; i < r->rewrite_nr; i++) {
201 if (len
202 ? (len == r->rewrite[i]->baselen &&
203 !strncmp(base, r->rewrite[i]->base, len))
204 : !strcmp(base, r->rewrite[i]->base))
205 return r->rewrite[i];
206 }
207 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
209 ret = xcalloc(1, sizeof(struct rewrite));
210 r->rewrite[r->rewrite_nr++] = ret;
211 if (len) {
212 ret->base = xstrndup(base, len);
213 ret->baselen = len;
214 }
215 else {
216 ret->base = xstrdup(base);
217 ret->baselen = strlen(base);
218 }
219 return ret;
220}
221static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
223{
224 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
225 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
226 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
227 rewrite->instead_of_nr++;
228}
229static void read_remotes_file(struct remote *remote)
231{
232 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
233 if (!f)
235 return;
236 remote->origin = REMOTE_REMOTES;
237 while (fgets(buffer, BUF_SIZE, f)) {
238 int value_list;
239 char *s, *p;
240 if (!prefixcmp(buffer, "URL:")) {
242 value_list = 0;
243 s = buffer + 4;
244 } else if (!prefixcmp(buffer, "Push:")) {
245 value_list = 1;
246 s = buffer + 5;
247 } else if (!prefixcmp(buffer, "Pull:")) {
248 value_list = 2;
249 s = buffer + 5;
250 } else
251 continue;
252 while (isspace(*s))
254 s++;
255 if (!*s)
256 continue;
257 p = s + strlen(s);
259 while (isspace(p[-1]))
260 *--p = 0;
261 switch (value_list) {
263 case 0:
264 add_url_alias(remote, xstrdup(s));
265 break;
266 case 1:
267 add_push_refspec(remote, xstrdup(s));
268 break;
269 case 2:
270 add_fetch_refspec(remote, xstrdup(s));
271 break;
272 }
273 }
274 fclose(f);
275}
276static void read_branches_file(struct remote *remote)
278{
279 const char *slash = strchr(remote->name, '/');
280 char *frag;
281 struct strbuf branch = STRBUF_INIT;
282 int n = slash ? slash - remote->name : 1000;
283 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
284 char *s, *p;
285 int len;
286 if (!f)
288 return;
289 s = fgets(buffer, BUF_SIZE, f);
290 fclose(f);
291 if (!s)
292 return;
293 while (isspace(*s))
294 s++;
295 if (!*s)
296 return;
297 remote->origin = REMOTE_BRANCHES;
298 p = s + strlen(s);
299 while (isspace(p[-1]))
300 *--p = 0;
301 len = p - s;
302 if (slash)
303 len += strlen(slash);
304 p = xmalloc(len + 1);
305 strcpy(p, s);
306 if (slash)
307 strcat(p, slash);
308 /*
310 * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
311 * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
312 * the partial URL obtained from the branches file plus
313 * "/netdev-2.6" and does not store it in any tracking ref.
314 * #branch specifier in the file is ignored.
315 *
316 * Otherwise, the branches file would have URL and optionally
317 * #branch specified. The "master" (or specified) branch is
318 * fetched and stored in the local branch of the same name.
319 */
320 frag = strchr(p, '#');
321 if (frag) {
322 *(frag++) = '\0';
323 strbuf_addf(&branch, "refs/heads/%s", frag);
324 } else
325 strbuf_addstr(&branch, "refs/heads/master");
326 if (!slash) {
327 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
328 } else {
329 strbuf_reset(&branch);
330 strbuf_addstr(&branch, "HEAD:");
331 }
332 add_url_alias(remote, p);
333 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
334 /*
335 * Cogito compatible push: push current HEAD to remote #branch
336 * (master if missing)
337 */
338 strbuf_init(&branch, 0);
339 strbuf_addstr(&branch, "HEAD");
340 if (frag)
341 strbuf_addf(&branch, ":refs/heads/%s", frag);
342 else
343 strbuf_addstr(&branch, ":refs/heads/master");
344 add_push_refspec(remote, strbuf_detach(&branch, NULL));
345 remote->fetch_tags = 1; /* always auto-follow */
346}
347static int handle_config(const char *key, const char *value, void *cb)
349{
350 const char *name;
351 const char *subkey;
352 struct remote *remote;
353 struct branch *branch;
354 if (!prefixcmp(key, "branch.")) {
355 name = key + 7;
356 subkey = strrchr(name, '.');
357 if (!subkey)
358 return 0;
359 branch = make_branch(name, subkey - name);
360 if (!strcmp(subkey, ".remote")) {
361 if (git_config_string(&branch->remote_name, key, value))
362 return -1;
363 if (branch == current_branch) {
364 default_remote_name = branch->remote_name;
365 explicit_default_remote_name = 1;
366 }
367 } else if (!strcmp(subkey, ".pushremote")) {
368 if (branch == current_branch)
369 if (git_config_string(&pushremote_name, key, value))
370 return -1;
371 } else if (!strcmp(subkey, ".merge")) {
372 if (!value)
373 return config_error_nonbool(key);
374 add_merge(branch, xstrdup(value));
375 }
376 return 0;
377 }
378 if (!prefixcmp(key, "url.")) {
379 struct rewrite *rewrite;
380 name = key + 4;
381 subkey = strrchr(name, '.');
382 if (!subkey)
383 return 0;
384 if (!strcmp(subkey, ".insteadof")) {
385 rewrite = make_rewrite(&rewrites, name, subkey - name);
386 if (!value)
387 return config_error_nonbool(key);
388 add_instead_of(rewrite, xstrdup(value));
389 } else if (!strcmp(subkey, ".pushinsteadof")) {
390 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
391 if (!value)
392 return config_error_nonbool(key);
393 add_instead_of(rewrite, xstrdup(value));
394 }
395 }
396 if (prefixcmp(key, "remote."))
398 return 0;
399 name = key + 7;
400 /* Handle remote.* variables */
402 if (!strcmp(name, "pushdefault"))
403 return git_config_string(&pushremote_name, key, value);
404 /* Handle remote.<name>.* variables */
406 if (*name == '/') {
407 warning("Config remote shorthand cannot begin with '/': %s",
408 name);
409 return 0;
410 }
411 subkey = strrchr(name, '.');
412 if (!subkey)
413 return 0;
414 remote = make_remote(name, subkey - name);
415 remote->origin = REMOTE_CONFIG;
416 if (!strcmp(subkey, ".mirror"))
417 remote->mirror = git_config_bool(key, value);
418 else if (!strcmp(subkey, ".skipdefaultupdate"))
419 remote->skip_default_update = git_config_bool(key, value);
420 else if (!strcmp(subkey, ".skipfetchall"))
421 remote->skip_default_update = git_config_bool(key, value);
422 else if (!strcmp(subkey, ".url")) {
423 const char *v;
424 if (git_config_string(&v, key, value))
425 return -1;
426 add_url(remote, v);
427 } else if (!strcmp(subkey, ".pushurl")) {
428 const char *v;
429 if (git_config_string(&v, key, value))
430 return -1;
431 add_pushurl(remote, v);
432 } else if (!strcmp(subkey, ".push")) {
433 const char *v;
434 if (git_config_string(&v, key, value))
435 return -1;
436 add_push_refspec(remote, v);
437 } else if (!strcmp(subkey, ".fetch")) {
438 const char *v;
439 if (git_config_string(&v, key, value))
440 return -1;
441 add_fetch_refspec(remote, v);
442 } else if (!strcmp(subkey, ".receivepack")) {
443 const char *v;
444 if (git_config_string(&v, key, value))
445 return -1;
446 if (!remote->receivepack)
447 remote->receivepack = v;
448 else
449 error("more than one receivepack given, using the first");
450 } else if (!strcmp(subkey, ".uploadpack")) {
451 const char *v;
452 if (git_config_string(&v, key, value))
453 return -1;
454 if (!remote->uploadpack)
455 remote->uploadpack = v;
456 else
457 error("more than one uploadpack given, using the first");
458 } else if (!strcmp(subkey, ".tagopt")) {
459 if (!strcmp(value, "--no-tags"))
460 remote->fetch_tags = -1;
461 else if (!strcmp(value, "--tags"))
462 remote->fetch_tags = 2;
463 } else if (!strcmp(subkey, ".proxy")) {
464 return git_config_string((const char **)&remote->http_proxy,
465 key, value);
466 } else if (!strcmp(subkey, ".vcs")) {
467 return git_config_string(&remote->foreign_vcs, key, value);
468 }
469 return 0;
470}
471static void alias_all_urls(void)
473{
474 int i, j;
475 for (i = 0; i < remotes_nr; i++) {
476 int add_pushurl_aliases;
477 if (!remotes[i])
478 continue;
479 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
480 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
481 }
482 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
483 for (j = 0; j < remotes[i]->url_nr; j++) {
484 if (add_pushurl_aliases)
485 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
486 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
487 }
488 }
489}
490static void read_config(void)
492{
493 unsigned char sha1[20];
494 const char *head_ref;
495 int flag;
496 if (default_remote_name) /* did this already */
497 return;
498 default_remote_name = xstrdup("origin");
499 current_branch = NULL;
500 head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
501 if (head_ref && (flag & REF_ISSYMREF) &&
502 !prefixcmp(head_ref, "refs/heads/")) {
503 current_branch =
504 make_branch(head_ref + strlen("refs/heads/"), 0);
505 }
506 git_config(handle_config, NULL);
507 alias_all_urls();
508}
509/*
511 * This function frees a refspec array.
512 * Warning: code paths should be checked to ensure that the src
513 * and dst pointers are always freeable pointers as well
514 * as the refspec pointer itself.
515 */
516static void free_refspecs(struct refspec *refspec, int nr_refspec)
517{
518 int i;
519 if (!refspec)
521 return;
522 for (i = 0; i < nr_refspec; i++) {
524 free(refspec[i].src);
525 free(refspec[i].dst);
526 }
527 free(refspec);
528}
529static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
531{
532 int i;
533 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
534 for (i = 0; i < nr_refspec; i++) {
536 size_t llen;
537 int is_glob;
538 const char *lhs, *rhs;
539 int flags;
540 is_glob = 0;
542 lhs = refspec[i];
544 if (*lhs == '+') {
545 rs[i].force = 1;
546 lhs++;
547 }
548 rhs = strrchr(lhs, ':');
550 /*
552 * Before going on, special case ":" (or "+:") as a refspec
553 * for pushing matching refs.
554 */
555 if (!fetch && rhs == lhs && rhs[1] == '\0') {
556 rs[i].matching = 1;
557 continue;
558 }
559 if (rhs) {
561 size_t rlen = strlen(++rhs);
562 is_glob = (1 <= rlen && strchr(rhs, '*'));
563 rs[i].dst = xstrndup(rhs, rlen);
564 }
565 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
567 if (1 <= llen && memchr(lhs, '*', llen)) {
568 if ((rhs && !is_glob) || (!rhs && fetch))
569 goto invalid;
570 is_glob = 1;
571 } else if (rhs && is_glob) {
572 goto invalid;
573 }
574 rs[i].pattern = is_glob;
576 rs[i].src = xstrndup(lhs, llen);
577 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
578 if (fetch) {
580 unsigned char unused[40];
581 /* LHS */
583 if (!*rs[i].src)
584 ; /* empty is ok; it means "HEAD" */
585 else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
586 rs[i].exact_sha1 = 1; /* ok */
587 else if (!check_refname_format(rs[i].src, flags))
588 ; /* valid looking ref is ok */
589 else
590 goto invalid;
591 /* RHS */
592 if (!rs[i].dst)
593 ; /* missing is ok; it is the same as empty */
594 else if (!*rs[i].dst)
595 ; /* empty is ok; it means "do not store" */
596 else if (!check_refname_format(rs[i].dst, flags))
597 ; /* valid looking ref is ok */
598 else
599 goto invalid;
600 } else {
601 /*
602 * LHS
603 * - empty is allowed; it means delete.
604 * - when wildcarded, it must be a valid looking ref.
605 * - otherwise, it must be an extended SHA-1, but
606 * there is no existing way to validate this.
607 */
608 if (!*rs[i].src)
609 ; /* empty is ok */
610 else if (is_glob) {
611 if (check_refname_format(rs[i].src, flags))
612 goto invalid;
613 }
614 else
615 ; /* anything goes, for now */
616 /*
617 * RHS
618 * - missing is allowed, but LHS then must be a
619 * valid looking ref.
620 * - empty is not allowed.
621 * - otherwise it must be a valid looking ref.
622 */
623 if (!rs[i].dst) {
624 if (check_refname_format(rs[i].src, flags))
625 goto invalid;
626 } else if (!*rs[i].dst) {
627 goto invalid;
628 } else {
629 if (check_refname_format(rs[i].dst, flags))
630 goto invalid;
631 }
632 }
633 }
634 return rs;
635 invalid:
637 if (verify) {
638 /*
639 * nr_refspec must be greater than zero and i must be valid
640 * since it is only possible to reach this point from within
641 * the for loop above.
642 */
643 free_refspecs(rs, i+1);
644 return NULL;
645 }
646 die("Invalid refspec '%s'", refspec[i]);
647}
648int valid_fetch_refspec(const char *fetch_refspec_str)
650{
651 struct refspec *refspec;
652 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
654 free_refspecs(refspec, 1);
655 return !!refspec;
656}
657struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
659{
660 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
661}
662static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
664{
665 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
666}
667void free_refspec(int nr_refspec, struct refspec *refspec)
669{
670 int i;
671 for (i = 0; i < nr_refspec; i++) {
672 free(refspec[i].src);
673 free(refspec[i].dst);
674 }
675 free(refspec);
676}
677static int valid_remote_nick(const char *name)
679{
680 if (!name[0] || is_dot_or_dotdot(name))
681 return 0;
682 return !strchr(name, '/'); /* no slash */
683}
684static struct remote *remote_get_1(const char *name, const char *pushremote_name)
686{
687 struct remote *ret;
688 int name_given = 0;
689 if (name)
691 name_given = 1;
692 else {
693 if (pushremote_name) {
694 name = pushremote_name;
695 name_given = 1;
696 } else {
697 name = default_remote_name;
698 name_given = explicit_default_remote_name;
699 }
700 }
701 ret = make_remote(name, 0);
703 if (valid_remote_nick(name)) {
704 if (!valid_remote(ret))
705 read_remotes_file(ret);
706 if (!valid_remote(ret))
707 read_branches_file(ret);
708 }
709 if (name_given && !valid_remote(ret))
710 add_url_alias(ret, name);
711 if (!valid_remote(ret))
712 return NULL;
713 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
714 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
715 return ret;
716}
717struct remote *remote_get(const char *name)
719{
720 read_config();
721 return remote_get_1(name, NULL);
722}
723struct remote *pushremote_get(const char *name)
725{
726 read_config();
727 return remote_get_1(name, pushremote_name);
728}
729int remote_is_configured(const char *name)
731{
732 int i;
733 read_config();
734 for (i = 0; i < remotes_nr; i++)
736 if (!strcmp(name, remotes[i]->name))
737 return 1;
738 return 0;
739}
740int for_each_remote(each_remote_fn fn, void *priv)
742{
743 int i, result = 0;
744 read_config();
745 for (i = 0; i < remotes_nr && !result; i++) {
746 struct remote *r = remotes[i];
747 if (!r)
748 continue;
749 if (!r->fetch)
750 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
751 r->fetch_refspec);
752 if (!r->push)
753 r->push = parse_push_refspec(r->push_refspec_nr,
754 r->push_refspec);
755 result = fn(r, priv);
756 }
757 return result;
758}
759void ref_remove_duplicates(struct ref *ref_map)
761{
762 struct string_list refs = STRING_LIST_INIT_NODUP;
763 struct string_list_item *item = NULL;
764 struct ref *prev = NULL, *next = NULL;
765 for (; ref_map; prev = ref_map, ref_map = next) {
766 next = ref_map->next;
767 if (!ref_map->peer_ref)
768 continue;
769 item = string_list_lookup(&refs, ref_map->peer_ref->name);
771 if (item) {
772 if (strcmp(((struct ref *)item->util)->name,
773 ref_map->name))
774 die("%s tracks both %s and %s",
775 ref_map->peer_ref->name,
776 ((struct ref *)item->util)->name,
777 ref_map->name);
778 prev->next = ref_map->next;
779 free(ref_map->peer_ref);
780 free(ref_map);
781 ref_map = prev; /* skip this; we freed it */
782 continue;
783 }
784 item = string_list_insert(&refs, ref_map->peer_ref->name);
786 item->util = ref_map;
787 }
788 string_list_clear(&refs, 0);
789}
790int remote_has_url(struct remote *remote, const char *url)
792{
793 int i;
794 for (i = 0; i < remote->url_nr; i++) {
795 if (!strcmp(remote->url[i], url))
796 return 1;
797 }
798 return 0;
799}
800static int match_name_with_pattern(const char *key, const char *name,
802 const char *value, char **result)
803{
804 const char *kstar = strchr(key, '*');
805 size_t klen;
806 size_t ksuffixlen;
807 size_t namelen;
808 int ret;
809 if (!kstar)
810 die("Key '%s' of pattern had no '*'", key);
811 klen = kstar - key;
812 ksuffixlen = strlen(kstar + 1);
813 namelen = strlen(name);
814 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
815 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
816 if (ret && value) {
817 const char *vstar = strchr(value, '*');
818 size_t vlen;
819 size_t vsuffixlen;
820 if (!vstar)
821 die("Value '%s' of pattern has no '*'", value);
822 vlen = vstar - value;
823 vsuffixlen = strlen(vstar + 1);
824 *result = xmalloc(vlen + vsuffixlen +
825 strlen(name) -
826 klen - ksuffixlen + 1);
827 strncpy(*result, value, vlen);
828 strncpy(*result + vlen,
829 name + klen, namelen - klen - ksuffixlen);
830 strcpy(*result + vlen + namelen - klen - ksuffixlen,
831 vstar + 1);
832 }
833 return ret;
834}
835static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
837{
838 int i;
839 int find_src = !query->src;
840 if (find_src && !query->dst)
842 return error("query_refspecs: need either src or dst");
843 for (i = 0; i < ref_count; i++) {
845 struct refspec *refspec = &refs[i];
846 const char *key = find_src ? refspec->dst : refspec->src;
847 const char *value = find_src ? refspec->src : refspec->dst;
848 const char *needle = find_src ? query->dst : query->src;
849 char **result = find_src ? &query->src : &query->dst;
850 if (!refspec->dst)
852 continue;
853 if (refspec->pattern) {
854 if (match_name_with_pattern(key, needle, value, result)) {
855 query->force = refspec->force;
856 return 0;
857 }
858 } else if (!strcmp(needle, key)) {
859 *result = xstrdup(value);
860 query->force = refspec->force;
861 return 0;
862 }
863 }
864 return -1;
865}
866char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
868 const char *name)
869{
870 struct refspec query;
871 memset(&query, 0, sizeof(struct refspec));
873 query.src = (char *)name;
874 if (query_refspecs(refspecs, nr_refspec, &query))
876 return NULL;
877 return query.dst;
879}
880int remote_find_tracking(struct remote *remote, struct refspec *refspec)
882{
883 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
884}
885static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
887 const char *name)
888{
889 size_t len = strlen(name);
890 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
891 memcpy(ref->name, prefix, prefixlen);
892 memcpy(ref->name + prefixlen, name, len);
893 return ref;
894}
895struct ref *alloc_ref(const char *name)
897{
898 return alloc_ref_with_prefix("", 0, name);
899}
900struct ref *copy_ref(const struct ref *ref)
902{
903 struct ref *cpy;
904 size_t len;
905 if (!ref)
906 return NULL;
907 len = strlen(ref->name);
908 cpy = xmalloc(sizeof(struct ref) + len + 1);
909 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
910 cpy->next = NULL;
911 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
912 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
913 cpy->peer_ref = copy_ref(ref->peer_ref);
914 return cpy;
915}
916struct ref *copy_ref_list(const struct ref *ref)
918{
919 struct ref *ret = NULL;
920 struct ref **tail = &ret;
921 while (ref) {
922 *tail = copy_ref(ref);
923 ref = ref->next;
924 tail = &((*tail)->next);
925 }
926 return ret;
927}
928static void free_ref(struct ref *ref)
930{
931 if (!ref)
932 return;
933 free_ref(ref->peer_ref);
934 free(ref->remote_status);
935 free(ref->symref);
936 free(ref);
937}
938void free_refs(struct ref *ref)
940{
941 struct ref *next;
942 while (ref) {
943 next = ref->next;
944 free_ref(ref);
945 ref = next;
946 }
947}
948int ref_compare_name(const void *va, const void *vb)
950{
951 const struct ref *a = va, *b = vb;
952 return strcmp(a->name, b->name);
953}
954static void *ref_list_get_next(const void *a)
956{
957 return ((const struct ref *)a)->next;
958}
959static void ref_list_set_next(void *a, void *next)
961{
962 ((struct ref *)a)->next = next;
963}
964void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
966{
967 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
968}
969static int count_refspec_match(const char *pattern,
971 struct ref *refs,
972 struct ref **matched_ref)
973{
974 int patlen = strlen(pattern);
975 struct ref *matched_weak = NULL;
976 struct ref *matched = NULL;
977 int weak_match = 0;
978 int match = 0;
979 for (weak_match = match = 0; refs; refs = refs->next) {
981 char *name = refs->name;
982 int namelen = strlen(name);
983 if (!refname_match(pattern, name, ref_rev_parse_rules))
985 continue;
986 /* A match is "weak" if it is with refs outside
988 * heads or tags, and did not specify the pattern
989 * in full (e.g. "refs/remotes/origin/master") or at
990 * least from the toplevel (e.g. "remotes/origin/master");
991 * otherwise "git push $URL master" would result in
992 * ambiguity between remotes/origin/master and heads/master
993 * at the remote site.
994 */
995 if (namelen != patlen &&
996 patlen != namelen - 5 &&
997 prefixcmp(name, "refs/heads/") &&
998 prefixcmp(name, "refs/tags/")) {
999 /* We want to catch the case where only weak
1000 * matches are found and there are multiple
1001 * matches, and where more than one strong
1002 * matches are found, as ambiguous. One
1003 * strong match with zero or more weak matches
1004 * are acceptable as a unique match.
1005 */
1006 matched_weak = refs;
1007 weak_match++;
1008 }
1009 else {
1010 matched = refs;
1011 match++;
1012 }
1013 }
1014 if (!matched) {
1015 *matched_ref = matched_weak;
1016 return weak_match;
1017 }
1018 else {
1019 *matched_ref = matched;
1020 return match;
1021 }
1022}
1023static void tail_link_ref(struct ref *ref, struct ref ***tail)
1025{
1026 **tail = ref;
1027 while (ref->next)
1028 ref = ref->next;
1029 *tail = &ref->next;
1030}
1031static struct ref *alloc_delete_ref(void)
1033{
1034 struct ref *ref = alloc_ref("(delete)");
1035 hashclr(ref->new_sha1);
1036 return ref;
1037}
1038static struct ref *try_explicit_object_name(const char *name)
1040{
1041 unsigned char sha1[20];
1042 struct ref *ref;
1043 if (!*name)
1045 return alloc_delete_ref();
1046 if (get_sha1(name, sha1))
1047 return NULL;
1048 ref = alloc_ref(name);
1049 hashcpy(ref->new_sha1, sha1);
1050 return ref;
1051}
1052static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1054{
1055 struct ref *ret = alloc_ref(name);
1056 tail_link_ref(ret, tail);
1057 return ret;
1058}
1059static char *guess_ref(const char *name, struct ref *peer)
1061{
1062 struct strbuf buf = STRBUF_INIT;
1063 unsigned char sha1[20];
1064 const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1066 if (!r)
1067 return NULL;
1068 if (!prefixcmp(r, "refs/heads/"))
1070 strbuf_addstr(&buf, "refs/heads/");
1071 else if (!prefixcmp(r, "refs/tags/"))
1072 strbuf_addstr(&buf, "refs/tags/");
1073 else
1074 return NULL;
1075 strbuf_addstr(&buf, name);
1077 return strbuf_detach(&buf, NULL);
1078}
1079static int match_explicit(struct ref *src, struct ref *dst,
1081 struct ref ***dst_tail,
1082 struct refspec *rs)
1083{
1084 struct ref *matched_src, *matched_dst;
1085 int copy_src;
1086 const char *dst_value = rs->dst;
1088 char *dst_guess;
1089 if (rs->pattern || rs->matching)
1091 return 0;
1092 matched_src = matched_dst = NULL;
1094 switch (count_refspec_match(rs->src, src, &matched_src)) {
1095 case 1:
1096 copy_src = 1;
1097 break;
1098 case 0:
1099 /* The source could be in the get_sha1() format
1100 * not a reference name. :refs/other is a
1101 * way to delete 'other' ref at the remote end.
1102 */
1103 matched_src = try_explicit_object_name(rs->src);
1104 if (!matched_src)
1105 return error("src refspec %s does not match any.", rs->src);
1106 copy_src = 0;
1107 break;
1108 default:
1109 return error("src refspec %s matches more than one.", rs->src);
1110 }
1111 if (!dst_value) {
1113 unsigned char sha1[20];
1114 int flag;
1115 dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1117 if (!dst_value ||
1118 ((flag & REF_ISSYMREF) &&
1119 prefixcmp(dst_value, "refs/heads/")))
1120 die("%s cannot be resolved to branch.",
1121 matched_src->name);
1122 }
1123 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1125 case 1:
1126 break;
1127 case 0:
1128 if (!memcmp(dst_value, "refs/", 5))
1129 matched_dst = make_linked_ref(dst_value, dst_tail);
1130 else if (is_null_sha1(matched_src->new_sha1))
1131 error("unable to delete '%s': remote ref does not exist",
1132 dst_value);
1133 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1134 matched_dst = make_linked_ref(dst_guess, dst_tail);
1135 else
1136 error("unable to push to unqualified destination: %s\n"
1137 "The destination refspec neither matches an "
1138 "existing ref on the remote nor\n"
1139 "begins with refs/, and we are unable to "
1140 "guess a prefix based on the source ref.",
1141 dst_value);
1142 break;
1143 default:
1144 matched_dst = NULL;
1145 error("dst refspec %s matches more than one.",
1146 dst_value);
1147 break;
1148 }
1149 if (!matched_dst)
1150 return -1;
1151 if (matched_dst->peer_ref)
1152 return error("dst ref %s receives from more than one src.",
1153 matched_dst->name);
1154 else {
1155 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1156 matched_dst->force = rs->force;
1157 }
1158 return 0;
1159}
1160static int match_explicit_refs(struct ref *src, struct ref *dst,
1162 struct ref ***dst_tail, struct refspec *rs,
1163 int rs_nr)
1164{
1165 int i, errs;
1166 for (i = errs = 0; i < rs_nr; i++)
1167 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1168 return errs;
1169}
1170static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1172 int send_mirror, int direction, const struct refspec **ret_pat)
1173{
1174 const struct refspec *pat;
1175 char *name;
1176 int i;
1177 int matching_refs = -1;
1178 for (i = 0; i < rs_nr; i++) {
1179 if (rs[i].matching &&
1180 (matching_refs == -1 || rs[i].force)) {
1181 matching_refs = i;
1182 continue;
1183 }
1184 if (rs[i].pattern) {
1186 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1187 int match;
1188 if (direction == FROM_SRC)
1189 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1190 else
1191 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1192 if (match) {
1193 matching_refs = i;
1194 break;
1195 }
1196 }
1197 }
1198 if (matching_refs == -1)
1199 return NULL;
1200 pat = rs + matching_refs;
1202 if (pat->matching) {
1203 /*
1204 * "matching refs"; traditionally we pushed everything
1205 * including refs outside refs/heads/ hierarchy, but
1206 * that does not make much sense these days.
1207 */
1208 if (!send_mirror && prefixcmp(ref->name, "refs/heads/"))
1209 return NULL;
1210 name = xstrdup(ref->name);
1211 }
1212 if (ret_pat)
1213 *ret_pat = pat;
1214 return name;
1215}
1216static struct ref **tail_ref(struct ref **head)
1218{
1219 struct ref **tail = head;
1220 while (*tail)
1221 tail = &((*tail)->next);
1222 return tail;
1223}
1224struct tips {
1226 struct commit **tip;
1227 int nr, alloc;
1228};
1229static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1231{
1232 struct commit *commit;
1233 if (is_null_sha1(sha1))
1235 return;
1236 commit = lookup_commit_reference_gently(sha1, 1);
1237 if (!commit || (commit->object.flags & TMP_MARK))
1238 return;
1239 commit->object.flags |= TMP_MARK;
1240 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1241 tips->tip[tips->nr++] = commit;
1242}
1243static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1245{
1246 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1247 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1248 struct string_list_item *item;
1249 struct ref *ref;
1250 struct tips sent_tips;
1251 /*
1253 * Collect everything we know they would have at the end of
1254 * this push, and collect all tags they have.
1255 */
1256 memset(&sent_tips, 0, sizeof(sent_tips));
1257 for (ref = *dst; ref; ref = ref->next) {
1258 if (ref->peer_ref &&
1259 !is_null_sha1(ref->peer_ref->new_sha1))
1260 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1261 else
1262 add_to_tips(&sent_tips, ref->old_sha1);
1263 if (!prefixcmp(ref->name, "refs/tags/"))
1264 string_list_append(&dst_tag, ref->name);
1265 }
1266 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1267 sort_string_list(&dst_tag);
1269 /* Collect tags they do not have. */
1271 for (ref = src; ref; ref = ref->next) {
1272 if (prefixcmp(ref->name, "refs/tags/"))
1273 continue; /* not a tag */
1274 if (string_list_has_string(&dst_tag, ref->name))
1275 continue; /* they already have it */
1276 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1277 continue; /* be conservative */
1278 item = string_list_append(&src_tag, ref->name);
1279 item->util = ref;
1280 }
1281 string_list_clear(&dst_tag, 0);
1282 /*
1284 * At this point, src_tag lists tags that are missing from
1285 * dst, and sent_tips lists the tips we are pushing or those
1286 * that we know they already have. An element in the src_tag
1287 * that is an ancestor of any of the sent_tips needs to be
1288 * sent to the other side.
1289 */
1290 if (sent_tips.nr) {
1291 for_each_string_list_item(item, &src_tag) {
1292 struct ref *ref = item->util;
1293 struct ref *dst_ref;
1294 struct commit *commit;
1295 if (is_null_sha1(ref->new_sha1))
1297 continue;
1298 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1299 if (!commit)
1300 /* not pushing a commit, which is not an error */
1301 continue;
1302 /*
1304 * Is this tag, which they do not have, reachable from
1305 * any of the commits we are sending?
1306 */
1307 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1308 continue;
1309 /* Add it in */
1311 dst_ref = make_linked_ref(ref->name, dst_tail);
1312 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1313 dst_ref->peer_ref = copy_ref(ref);
1314 }
1315 }
1316 string_list_clear(&src_tag, 0);
1317 free(sent_tips.tip);
1318}
1319static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1321{
1322 for ( ; ref; ref = ref->next)
1323 string_list_append_nodup(ref_index, ref->name)->util = ref;
1324 sort_string_list(ref_index);
1326}
1327/*
1329 * Given the set of refs the local repository has, the set of refs the
1330 * remote repository has, and the refspec used for push, determine
1331 * what remote refs we will update and with what value by setting
1332 * peer_ref (which object is being pushed) and force (if the push is
1333 * forced) in elements of "dst". The function may add new elements to
1334 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1335 */
1336int match_push_refs(struct ref *src, struct ref **dst,
1337 int nr_refspec, const char **refspec, int flags)
1338{
1339 struct refspec *rs;
1340 int send_all = flags & MATCH_REFS_ALL;
1341 int send_mirror = flags & MATCH_REFS_MIRROR;
1342 int send_prune = flags & MATCH_REFS_PRUNE;
1343 int errs;
1344 static const char *default_refspec[] = { ":", NULL };
1345 struct ref *ref, **dst_tail = tail_ref(dst);
1346 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1347 if (!nr_refspec) {
1349 nr_refspec = 1;
1350 refspec = default_refspec;
1351 }
1352 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1353 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1354 /* pick the remainder */
1356 for (ref = src; ref; ref = ref->next) {
1357 struct string_list_item *dst_item;
1358 struct ref *dst_peer;
1359 const struct refspec *pat = NULL;
1360 char *dst_name;
1361 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1363 if (!dst_name)
1364 continue;
1365 if (!dst_ref_index.nr)
1367 prepare_ref_index(&dst_ref_index, *dst);
1368 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1370 dst_peer = dst_item ? dst_item->util : NULL;
1371 if (dst_peer) {
1372 if (dst_peer->peer_ref)
1373 /* We're already sending something to this ref. */
1374 goto free_name;
1375 } else {
1376 if (pat->matching && !(send_all || send_mirror))
1377 /*
1378 * Remote doesn't have it, and we have no
1379 * explicit pattern, and we don't have
1380 * --all nor --mirror.
1381 */
1382 goto free_name;
1383 /* Create a new one and link it */
1385 dst_peer = make_linked_ref(dst_name, &dst_tail);
1386 hashcpy(dst_peer->new_sha1, ref->new_sha1);
1387 string_list_insert(&dst_ref_index,
1388 dst_peer->name)->util = dst_peer;
1389 }
1390 dst_peer->peer_ref = copy_ref(ref);
1391 dst_peer->force = pat->force;
1392 free_name:
1393 free(dst_name);
1394 }
1395 string_list_clear(&dst_ref_index, 0);
1397 if (flags & MATCH_REFS_FOLLOW_TAGS)
1399 add_missing_tags(src, dst, &dst_tail);
1400 if (send_prune) {
1402 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1403 /* check for missing refs on the remote */
1404 for (ref = *dst; ref; ref = ref->next) {
1405 char *src_name;
1406 if (ref->peer_ref)
1408 /* We're already sending something to this ref. */
1409 continue;
1410 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1412 if (src_name) {
1413 if (!src_ref_index.nr)
1414 prepare_ref_index(&src_ref_index, src);
1415 if (!string_list_has_string(&src_ref_index,
1416 src_name))
1417 ref->peer_ref = alloc_delete_ref();
1418 free(src_name);
1419 }
1420 }
1421 string_list_clear(&src_ref_index, 0);
1422 }
1423 if (errs)
1424 return -1;
1425 return 0;
1426}
1427void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1429 int force_update)
1430{
1431 struct ref *ref;
1432 for (ref = remote_refs; ref; ref = ref->next) {
1434 int force_ref_update = ref->force || force_update;
1435 if (ref->peer_ref)
1437 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1438 else if (!send_mirror)
1439 continue;
1440 ref->deletion = is_null_sha1(ref->new_sha1);
1442 if (!ref->deletion &&
1443 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1444 ref->status = REF_STATUS_UPTODATE;
1445 continue;
1446 }
1447 /*
1449 * Decide whether an individual refspec A:B can be
1450 * pushed. The push will succeed if any of the
1451 * following are true:
1452 *
1453 * (1) the remote reference B does not exist
1454 *
1455 * (2) the remote reference B is being removed (i.e.,
1456 * pushing :B where no source is specified)
1457 *
1458 * (3) the destination is not under refs/tags/, and
1459 * if the old and new value is a commit, the new
1460 * is a descendant of the old.
1461 *
1462 * (4) it is forced using the +A:B notation, or by
1463 * passing the --force argument
1464 */
1465 if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1467 int why = 0; /* why would this push require --force? */
1468 if (!prefixcmp(ref->name, "refs/tags/"))
1470 why = REF_STATUS_REJECT_ALREADY_EXISTS;
1471 else if (!has_sha1_file(ref->old_sha1))
1472 why = REF_STATUS_REJECT_FETCH_FIRST;
1473 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1474 !lookup_commit_reference_gently(ref->new_sha1, 1))
1475 why = REF_STATUS_REJECT_NEEDS_FORCE;
1476 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1477 why = REF_STATUS_REJECT_NONFASTFORWARD;
1478 if (!force_ref_update)
1480 ref->status = why;
1481 else if (why)
1482 ref->forced_update = 1;
1483 }
1484 }
1485}
1486struct branch *branch_get(const char *name)
1488{
1489 struct branch *ret;
1490 read_config();
1492 if (!name || !*name || !strcmp(name, "HEAD"))
1493 ret = current_branch;
1494 else
1495 ret = make_branch(name, 0);
1496 if (ret && ret->remote_name) {
1497 ret->remote = remote_get(ret->remote_name);
1498 if (ret->merge_nr) {
1499 int i;
1500 ret->merge = xcalloc(sizeof(*ret->merge),
1501 ret->merge_nr);
1502 for (i = 0; i < ret->merge_nr; i++) {
1503 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1504 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1505 if (remote_find_tracking(ret->remote, ret->merge[i])
1506 && !strcmp(ret->remote_name, "."))
1507 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1508 }
1509 }
1510 }
1511 return ret;
1512}
1513int branch_has_merge_config(struct branch *branch)
1515{
1516 return branch && !!branch->merge;
1517}
1518int branch_merge_matches(struct branch *branch,
1520 int i,
1521 const char *refname)
1522{
1523 if (!branch || i < 0 || i >= branch->merge_nr)
1524 return 0;
1525 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1526}
1527static int ignore_symref_update(const char *refname)
1529{
1530 unsigned char sha1[20];
1531 int flag;
1532 if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1534 return 0; /* non-existing refs are OK */
1535 return (flag & REF_ISSYMREF);
1536}
1537static struct ref *get_expanded_map(const struct ref *remote_refs,
1539 const struct refspec *refspec)
1540{
1541 const struct ref *ref;
1542 struct ref *ret = NULL;
1543 struct ref **tail = &ret;
1544 char *expn_name;
1546 for (ref = remote_refs; ref; ref = ref->next) {
1548 if (strchr(ref->name, '^'))
1549 continue; /* a dereference item */
1550 if (match_name_with_pattern(refspec->src, ref->name,
1551 refspec->dst, &expn_name) &&
1552 !ignore_symref_update(expn_name)) {
1553 struct ref *cpy = copy_ref(ref);
1554 cpy->peer_ref = alloc_ref(expn_name);
1556 free(expn_name);
1557 if (refspec->force)
1558 cpy->peer_ref->force = 1;
1559 *tail = cpy;
1560 tail = &cpy->next;
1561 }
1562 }
1563 return ret;
1565}
1566static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1568{
1569 const struct ref *ref;
1570 for (ref = refs; ref; ref = ref->next) {
1571 if (refname_match(name, ref->name, ref_fetch_rules))
1572 return ref;
1573 }
1574 return NULL;
1575}
1576struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1578{
1579 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1580 if (!ref)
1582 return NULL;
1583 return copy_ref(ref);
1585}
1586static struct ref *get_local_ref(const char *name)
1588{
1589 if (!name || name[0] == '\0')
1590 return NULL;
1591 if (!prefixcmp(name, "refs/"))
1593 return alloc_ref(name);
1594 if (!prefixcmp(name, "heads/") ||
1596 !prefixcmp(name, "tags/") ||
1597 !prefixcmp(name, "remotes/"))
1598 return alloc_ref_with_prefix("refs/", 5, name);
1599 return alloc_ref_with_prefix("refs/heads/", 11, name);
1601}
1602int get_fetch_map(const struct ref *remote_refs,
1604 const struct refspec *refspec,
1605 struct ref ***tail,
1606 int missing_ok)
1607{
1608 struct ref *ref_map, **rmp;
1609 if (refspec->pattern) {
1611 ref_map = get_expanded_map(remote_refs, refspec);
1612 } else {
1613 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1614 if (refspec->exact_sha1) {
1616 ref_map = alloc_ref(name);
1617 get_sha1_hex(name, ref_map->old_sha1);
1618 } else {
1619 ref_map = get_remote_ref(remote_refs, name);
1620 }
1621 if (!missing_ok && !ref_map)
1622 die("Couldn't find remote ref %s", name);
1623 if (ref_map) {
1624 ref_map->peer_ref = get_local_ref(refspec->dst);
1625 if (ref_map->peer_ref && refspec->force)
1626 ref_map->peer_ref->force = 1;
1627 }
1628 }
1629 for (rmp = &ref_map; *rmp; ) {
1631 if ((*rmp)->peer_ref) {
1632 if (prefixcmp((*rmp)->peer_ref->name, "refs/") ||
1633 check_refname_format((*rmp)->peer_ref->name, 0)) {
1634 struct ref *ignore = *rmp;
1635 error("* Ignoring funny ref '%s' locally",
1636 (*rmp)->peer_ref->name);
1637 *rmp = (*rmp)->next;
1638 free(ignore->peer_ref);
1639 free(ignore);
1640 continue;
1641 }
1642 }
1643 rmp = &((*rmp)->next);
1644 }
1645 if (ref_map)
1647 tail_link_ref(ref_map, tail);
1648 return 0;
1650}
1651int resolve_remote_symref(struct ref *ref, struct ref *list)
1653{
1654 if (!ref->symref)
1655 return 0;
1656 for (; list; list = list->next)
1657 if (!strcmp(ref->symref, list->name)) {
1658 hashcpy(ref->old_sha1, list->old_sha1);
1659 return 0;
1660 }
1661 return 1;
1662}
1663static void unmark_and_free(struct commit_list *list, unsigned int mark)
1665{
1666 while (list) {
1667 struct commit_list *temp = list;
1668 temp->item->object.flags &= ~mark;
1669 list = temp->next;
1670 free(temp);
1671 }
1672}
1673int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1675{
1676 struct object *o;
1677 struct commit *old, *new;
1678 struct commit_list *list, *used;
1679 int found = 0;
1680 /*
1682 * Both new and old must be commit-ish and new is descendant of
1683 * old. Otherwise we require --force.
1684 */
1685 o = deref_tag(parse_object(old_sha1), NULL, 0);
1686 if (!o || o->type != OBJ_COMMIT)
1687 return 0;
1688 old = (struct commit *) o;
1689 o = deref_tag(parse_object(new_sha1), NULL, 0);
1691 if (!o || o->type != OBJ_COMMIT)
1692 return 0;
1693 new = (struct commit *) o;
1694 if (parse_commit(new) < 0)
1696 return 0;
1697 used = list = NULL;
1699 commit_list_insert(new, &list);
1700 while (list) {
1701 new = pop_most_recent_commit(&list, TMP_MARK);
1702 commit_list_insert(new, &used);
1703 if (new == old) {
1704 found = 1;
1705 break;
1706 }
1707 }
1708 unmark_and_free(list, TMP_MARK);
1709 unmark_and_free(used, TMP_MARK);
1710 return found;
1711}
1712/*
1714 * Return true if there is anything to report, otherwise false.
1715 */
1716int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1717{
1718 unsigned char sha1[20];
1719 struct commit *ours, *theirs;
1720 char symmetric[84];
1721 struct rev_info revs;
1722 const char *rev_argv[10], *base;
1723 int rev_argc;
1724 /*
1726 * Nothing to report unless we are marked to build on top of
1727 * somebody else.
1728 */
1729 if (!branch ||
1730 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1731 return 0;
1732 /*
1734 * If what we used to build on no longer exists, there is
1735 * nothing to report.
1736 */
1737 base = branch->merge[0]->dst;
1738 if (read_ref(base, sha1))
1739 return 0;
1740 theirs = lookup_commit_reference(sha1);
1741 if (!theirs)
1742 return 0;
1743 if (read_ref(branch->refname, sha1))
1745 return 0;
1746 ours = lookup_commit_reference(sha1);
1747 if (!ours)
1748 return 0;
1749 /* are we the same? */
1751 if (theirs == ours)
1752 return 0;
1753 /* Run "rev-list --left-right ours...theirs" internally... */
1755 rev_argc = 0;
1756 rev_argv[rev_argc++] = NULL;
1757 rev_argv[rev_argc++] = "--left-right";
1758 rev_argv[rev_argc++] = symmetric;
1759 rev_argv[rev_argc++] = "--";
1760 rev_argv[rev_argc] = NULL;
1761 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1763 strcpy(symmetric + 40, "...");
1764 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1765 init_revisions(&revs, NULL);
1767 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1768 prepare_revision_walk(&revs);
1769 /* ... and count the commits on each side. */
1771 *num_ours = 0;
1772 *num_theirs = 0;
1773 while (1) {
1774 struct commit *c = get_revision(&revs);
1775 if (!c)
1776 break;
1777 if (c->object.flags & SYMMETRIC_LEFT)
1778 (*num_ours)++;
1779 else
1780 (*num_theirs)++;
1781 }
1782 /* clear object flags smudged by the above traversal */
1784 clear_commit_marks(ours, ALL_REV_FLAGS);
1785 clear_commit_marks(theirs, ALL_REV_FLAGS);
1786 return 1;
1787}
1788/*
1790 * Return true when there is anything to report, otherwise false.
1791 */
1792int format_tracking_info(struct branch *branch, struct strbuf *sb)
1793{
1794 int num_ours, num_theirs;
1795 const char *base;
1796 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1798 return 0;
1799 base = branch->merge[0]->dst;
1801 base = shorten_unambiguous_ref(base, 0);
1802 if (!num_theirs) {
1803 strbuf_addf(sb,
1804 Q_("Your branch is ahead of '%s' by %d commit.\n",
1805 "Your branch is ahead of '%s' by %d commits.\n",
1806 num_ours),
1807 base, num_ours);
1808 if (advice_status_hints)
1809 strbuf_addf(sb,
1810 _(" (use \"git push\" to publish your local commits)\n"));
1811 } else if (!num_ours) {
1812 strbuf_addf(sb,
1813 Q_("Your branch is behind '%s' by %d commit, "
1814 "and can be fast-forwarded.\n",
1815 "Your branch is behind '%s' by %d commits, "
1816 "and can be fast-forwarded.\n",
1817 num_theirs),
1818 base, num_theirs);
1819 if (advice_status_hints)
1820 strbuf_addf(sb,
1821 _(" (use \"git pull\" to update your local branch)\n"));
1822 } else {
1823 strbuf_addf(sb,
1824 Q_("Your branch and '%s' have diverged,\n"
1825 "and have %d and %d different commit each, "
1826 "respectively.\n",
1827 "Your branch and '%s' have diverged,\n"
1828 "and have %d and %d different commits each, "
1829 "respectively.\n",
1830 num_theirs),
1831 base, num_ours, num_theirs);
1832 if (advice_status_hints)
1833 strbuf_addf(sb,
1834 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
1835 }
1836 return 1;
1837}
1838static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1840{
1841 struct ref ***local_tail = cb_data;
1842 struct ref *ref;
1843 int len;
1844 /* we already know it starts with refs/ to get here */
1846 if (check_refname_format(refname + 5, 0))
1847 return 0;
1848 len = strlen(refname) + 1;
1850 ref = xcalloc(1, sizeof(*ref) + len);
1851 hashcpy(ref->new_sha1, sha1);
1852 memcpy(ref->name, refname, len);
1853 **local_tail = ref;
1854 *local_tail = &ref->next;
1855 return 0;
1856}
1857struct ref *get_local_heads(void)
1859{
1860 struct ref *local_refs = NULL, **local_tail = &local_refs;
1861 for_each_ref(one_local_ref, &local_tail);
1862 return local_refs;
1863}
1864struct ref *guess_remote_head(const struct ref *head,
1866 const struct ref *refs,
1867 int all)
1868{
1869 const struct ref *r;
1870 struct ref *list = NULL;
1871 struct ref **tail = &list;
1872 if (!head)
1874 return NULL;
1875 /*
1877 * Some transports support directly peeking at
1878 * where HEAD points; if that is the case, then
1879 * we don't have to guess.
1880 */
1881 if (head->symref)
1882 return copy_ref(find_ref_by_name(refs, head->symref));
1883 /* If refs/heads/master could be right, it is. */
1885 if (!all) {
1886 r = find_ref_by_name(refs, "refs/heads/master");
1887 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1888 return copy_ref(r);
1889 }
1890 /* Look for another ref that points there */
1892 for (r = refs; r; r = r->next) {
1893 if (r != head &&
1894 !prefixcmp(r->name, "refs/heads/") &&
1895 !hashcmp(r->old_sha1, head->old_sha1)) {
1896 *tail = copy_ref(r);
1897 tail = &((*tail)->next);
1898 if (!all)
1899 break;
1900 }
1901 }
1902 return list;
1904}
1905struct stale_heads_info {
1907 struct string_list *ref_names;
1908 struct ref **stale_refs_tail;
1909 struct refspec *refs;
1910 int ref_count;
1911};
1912static int get_stale_heads_cb(const char *refname,
1914 const unsigned char *sha1, int flags, void *cb_data)
1915{
1916 struct stale_heads_info *info = cb_data;
1917 struct refspec query;
1918 memset(&query, 0, sizeof(struct refspec));
1919 query.dst = (char *)refname;
1920 if (query_refspecs(info->refs, info->ref_count, &query))
1922 return 0; /* No matches */
1923 /*
1925 * If we did find a suitable refspec and it's not a symref and
1926 * it's not in the list of refs that currently exist in that
1927 * remote we consider it to be stale.
1928 */
1929 if (!((flags & REF_ISSYMREF) ||
1930 string_list_has_string(info->ref_names, query.src))) {
1931 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1932 hashcpy(ref->new_sha1, sha1);
1933 }
1934 free(query.src);
1936 return 0;
1937}
1938struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
1940{
1941 struct ref *ref, *stale_refs = NULL;
1942 struct string_list ref_names = STRING_LIST_INIT_NODUP;
1943 struct stale_heads_info info;
1944 info.ref_names = &ref_names;
1945 info.stale_refs_tail = &stale_refs;
1946 info.refs = refs;
1947 info.ref_count = ref_count;
1948 for (ref = fetch_map; ref; ref = ref->next)
1949 string_list_append(&ref_names, ref->name);
1950 sort_string_list(&ref_names);
1951 for_each_ref(get_stale_heads_cb, &info);
1952 string_list_clear(&ref_names, 0);
1953 return stale_refs;
1954}