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 char *frag;
280 struct strbuf branch = STRBUF_INIT;
281 int n = 1000;
282 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
283 char *s, *p;
284 int len;
285 if (!f)
287 return;
288 s = fgets(buffer, BUF_SIZE, f);
289 fclose(f);
290 if (!s)
291 return;
292 while (isspace(*s))
293 s++;
294 if (!*s)
295 return;
296 remote->origin = REMOTE_BRANCHES;
297 p = s + strlen(s);
298 while (isspace(p[-1]))
299 *--p = 0;
300 len = p - s;
301 p = xmalloc(len + 1);
302 strcpy(p, s);
303 /*
305 * The branches file would have URL and optionally
306 * #branch specified. The "master" (or specified) branch is
307 * fetched and stored in the local branch of the same name.
308 */
309 frag = strchr(p, '#');
310 if (frag) {
311 *(frag++) = '\0';
312 strbuf_addf(&branch, "refs/heads/%s", frag);
313 } else
314 strbuf_addstr(&branch, "refs/heads/master");
315 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
317 add_url_alias(remote, p);
318 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
319 /*
320 * Cogito compatible push: push current HEAD to remote #branch
321 * (master if missing)
322 */
323 strbuf_init(&branch, 0);
324 strbuf_addstr(&branch, "HEAD");
325 if (frag)
326 strbuf_addf(&branch, ":refs/heads/%s", frag);
327 else
328 strbuf_addstr(&branch, ":refs/heads/master");
329 add_push_refspec(remote, strbuf_detach(&branch, NULL));
330 remote->fetch_tags = 1; /* always auto-follow */
331}
332static int handle_config(const char *key, const char *value, void *cb)
334{
335 const char *name;
336 const char *subkey;
337 struct remote *remote;
338 struct branch *branch;
339 if (!prefixcmp(key, "branch.")) {
340 name = key + 7;
341 subkey = strrchr(name, '.');
342 if (!subkey)
343 return 0;
344 branch = make_branch(name, subkey - name);
345 if (!strcmp(subkey, ".remote")) {
346 if (git_config_string(&branch->remote_name, key, value))
347 return -1;
348 if (branch == current_branch) {
349 default_remote_name = branch->remote_name;
350 explicit_default_remote_name = 1;
351 }
352 } else if (!strcmp(subkey, ".pushremote")) {
353 if (branch == current_branch)
354 if (git_config_string(&pushremote_name, key, value))
355 return -1;
356 } else if (!strcmp(subkey, ".merge")) {
357 if (!value)
358 return config_error_nonbool(key);
359 add_merge(branch, xstrdup(value));
360 }
361 return 0;
362 }
363 if (!prefixcmp(key, "url.")) {
364 struct rewrite *rewrite;
365 name = key + 4;
366 subkey = strrchr(name, '.');
367 if (!subkey)
368 return 0;
369 if (!strcmp(subkey, ".insteadof")) {
370 rewrite = make_rewrite(&rewrites, name, subkey - name);
371 if (!value)
372 return config_error_nonbool(key);
373 add_instead_of(rewrite, xstrdup(value));
374 } else if (!strcmp(subkey, ".pushinsteadof")) {
375 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
376 if (!value)
377 return config_error_nonbool(key);
378 add_instead_of(rewrite, xstrdup(value));
379 }
380 }
381 if (prefixcmp(key, "remote."))
383 return 0;
384 name = key + 7;
385 /* Handle remote.* variables */
387 if (!strcmp(name, "pushdefault"))
388 return git_config_string(&pushremote_name, key, value);
389 /* Handle remote.<name>.* variables */
391 if (*name == '/') {
392 warning("Config remote shorthand cannot begin with '/': %s",
393 name);
394 return 0;
395 }
396 subkey = strrchr(name, '.');
397 if (!subkey)
398 return 0;
399 remote = make_remote(name, subkey - name);
400 remote->origin = REMOTE_CONFIG;
401 if (!strcmp(subkey, ".mirror"))
402 remote->mirror = git_config_bool(key, value);
403 else if (!strcmp(subkey, ".skipdefaultupdate"))
404 remote->skip_default_update = git_config_bool(key, value);
405 else if (!strcmp(subkey, ".skipfetchall"))
406 remote->skip_default_update = git_config_bool(key, value);
407 else if (!strcmp(subkey, ".url")) {
408 const char *v;
409 if (git_config_string(&v, key, value))
410 return -1;
411 add_url(remote, v);
412 } else if (!strcmp(subkey, ".pushurl")) {
413 const char *v;
414 if (git_config_string(&v, key, value))
415 return -1;
416 add_pushurl(remote, v);
417 } else if (!strcmp(subkey, ".push")) {
418 const char *v;
419 if (git_config_string(&v, key, value))
420 return -1;
421 add_push_refspec(remote, v);
422 } else if (!strcmp(subkey, ".fetch")) {
423 const char *v;
424 if (git_config_string(&v, key, value))
425 return -1;
426 add_fetch_refspec(remote, v);
427 } else if (!strcmp(subkey, ".receivepack")) {
428 const char *v;
429 if (git_config_string(&v, key, value))
430 return -1;
431 if (!remote->receivepack)
432 remote->receivepack = v;
433 else
434 error("more than one receivepack given, using the first");
435 } else if (!strcmp(subkey, ".uploadpack")) {
436 const char *v;
437 if (git_config_string(&v, key, value))
438 return -1;
439 if (!remote->uploadpack)
440 remote->uploadpack = v;
441 else
442 error("more than one uploadpack given, using the first");
443 } else if (!strcmp(subkey, ".tagopt")) {
444 if (!strcmp(value, "--no-tags"))
445 remote->fetch_tags = -1;
446 else if (!strcmp(value, "--tags"))
447 remote->fetch_tags = 2;
448 } else if (!strcmp(subkey, ".proxy")) {
449 return git_config_string((const char **)&remote->http_proxy,
450 key, value);
451 } else if (!strcmp(subkey, ".vcs")) {
452 return git_config_string(&remote->foreign_vcs, key, value);
453 }
454 return 0;
455}
456static void alias_all_urls(void)
458{
459 int i, j;
460 for (i = 0; i < remotes_nr; i++) {
461 int add_pushurl_aliases;
462 if (!remotes[i])
463 continue;
464 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
465 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
466 }
467 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
468 for (j = 0; j < remotes[i]->url_nr; j++) {
469 if (add_pushurl_aliases)
470 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
471 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
472 }
473 }
474}
475static void read_config(void)
477{
478 unsigned char sha1[20];
479 const char *head_ref;
480 int flag;
481 if (default_remote_name) /* did this already */
482 return;
483 default_remote_name = xstrdup("origin");
484 current_branch = NULL;
485 head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
486 if (head_ref && (flag & REF_ISSYMREF) &&
487 !prefixcmp(head_ref, "refs/heads/")) {
488 current_branch =
489 make_branch(head_ref + strlen("refs/heads/"), 0);
490 }
491 git_config(handle_config, NULL);
492 alias_all_urls();
493}
494/*
496 * This function frees a refspec array.
497 * Warning: code paths should be checked to ensure that the src
498 * and dst pointers are always freeable pointers as well
499 * as the refspec pointer itself.
500 */
501static void free_refspecs(struct refspec *refspec, int nr_refspec)
502{
503 int i;
504 if (!refspec)
506 return;
507 for (i = 0; i < nr_refspec; i++) {
509 free(refspec[i].src);
510 free(refspec[i].dst);
511 }
512 free(refspec);
513}
514static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
516{
517 int i;
518 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
519 for (i = 0; i < nr_refspec; i++) {
521 size_t llen;
522 int is_glob;
523 const char *lhs, *rhs;
524 int flags;
525 is_glob = 0;
527 lhs = refspec[i];
529 if (*lhs == '+') {
530 rs[i].force = 1;
531 lhs++;
532 }
533 rhs = strrchr(lhs, ':');
535 /*
537 * Before going on, special case ":" (or "+:") as a refspec
538 * for pushing matching refs.
539 */
540 if (!fetch && rhs == lhs && rhs[1] == '\0') {
541 rs[i].matching = 1;
542 continue;
543 }
544 if (rhs) {
546 size_t rlen = strlen(++rhs);
547 is_glob = (1 <= rlen && strchr(rhs, '*'));
548 rs[i].dst = xstrndup(rhs, rlen);
549 }
550 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
552 if (1 <= llen && memchr(lhs, '*', llen)) {
553 if ((rhs && !is_glob) || (!rhs && fetch))
554 goto invalid;
555 is_glob = 1;
556 } else if (rhs && is_glob) {
557 goto invalid;
558 }
559 rs[i].pattern = is_glob;
561 rs[i].src = xstrndup(lhs, llen);
562 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
563 if (fetch) {
565 unsigned char unused[40];
566 /* LHS */
568 if (!*rs[i].src)
569 ; /* empty is ok; it means "HEAD" */
570 else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
571 rs[i].exact_sha1 = 1; /* ok */
572 else if (!check_refname_format(rs[i].src, flags))
573 ; /* valid looking ref is ok */
574 else
575 goto invalid;
576 /* RHS */
577 if (!rs[i].dst)
578 ; /* missing is ok; it is the same as empty */
579 else if (!*rs[i].dst)
580 ; /* empty is ok; it means "do not store" */
581 else if (!check_refname_format(rs[i].dst, flags))
582 ; /* valid looking ref is ok */
583 else
584 goto invalid;
585 } else {
586 /*
587 * LHS
588 * - empty is allowed; it means delete.
589 * - when wildcarded, it must be a valid looking ref.
590 * - otherwise, it must be an extended SHA-1, but
591 * there is no existing way to validate this.
592 */
593 if (!*rs[i].src)
594 ; /* empty is ok */
595 else if (is_glob) {
596 if (check_refname_format(rs[i].src, flags))
597 goto invalid;
598 }
599 else
600 ; /* anything goes, for now */
601 /*
602 * RHS
603 * - missing is allowed, but LHS then must be a
604 * valid looking ref.
605 * - empty is not allowed.
606 * - otherwise it must be a valid looking ref.
607 */
608 if (!rs[i].dst) {
609 if (check_refname_format(rs[i].src, flags))
610 goto invalid;
611 } else if (!*rs[i].dst) {
612 goto invalid;
613 } else {
614 if (check_refname_format(rs[i].dst, flags))
615 goto invalid;
616 }
617 }
618 }
619 return rs;
620 invalid:
622 if (verify) {
623 /*
624 * nr_refspec must be greater than zero and i must be valid
625 * since it is only possible to reach this point from within
626 * the for loop above.
627 */
628 free_refspecs(rs, i+1);
629 return NULL;
630 }
631 die("Invalid refspec '%s'", refspec[i]);
632}
633int valid_fetch_refspec(const char *fetch_refspec_str)
635{
636 struct refspec *refspec;
637 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
639 free_refspecs(refspec, 1);
640 return !!refspec;
641}
642struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
644{
645 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
646}
647static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
649{
650 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
651}
652void free_refspec(int nr_refspec, struct refspec *refspec)
654{
655 int i;
656 for (i = 0; i < nr_refspec; i++) {
657 free(refspec[i].src);
658 free(refspec[i].dst);
659 }
660 free(refspec);
661}
662static int valid_remote_nick(const char *name)
664{
665 if (!name[0] || is_dot_or_dotdot(name))
666 return 0;
667 return !strchr(name, '/'); /* no slash */
668}
669static struct remote *remote_get_1(const char *name, const char *pushremote_name)
671{
672 struct remote *ret;
673 int name_given = 0;
674 if (name)
676 name_given = 1;
677 else {
678 if (pushremote_name) {
679 name = pushremote_name;
680 name_given = 1;
681 } else {
682 name = default_remote_name;
683 name_given = explicit_default_remote_name;
684 }
685 }
686 ret = make_remote(name, 0);
688 if (valid_remote_nick(name)) {
689 if (!valid_remote(ret))
690 read_remotes_file(ret);
691 if (!valid_remote(ret))
692 read_branches_file(ret);
693 }
694 if (name_given && !valid_remote(ret))
695 add_url_alias(ret, name);
696 if (!valid_remote(ret))
697 return NULL;
698 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
699 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
700 return ret;
701}
702struct remote *remote_get(const char *name)
704{
705 read_config();
706 return remote_get_1(name, NULL);
707}
708struct remote *pushremote_get(const char *name)
710{
711 read_config();
712 return remote_get_1(name, pushremote_name);
713}
714int remote_is_configured(const char *name)
716{
717 int i;
718 read_config();
719 for (i = 0; i < remotes_nr; i++)
721 if (!strcmp(name, remotes[i]->name))
722 return 1;
723 return 0;
724}
725int for_each_remote(each_remote_fn fn, void *priv)
727{
728 int i, result = 0;
729 read_config();
730 for (i = 0; i < remotes_nr && !result; i++) {
731 struct remote *r = remotes[i];
732 if (!r)
733 continue;
734 if (!r->fetch)
735 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
736 r->fetch_refspec);
737 if (!r->push)
738 r->push = parse_push_refspec(r->push_refspec_nr,
739 r->push_refspec);
740 result = fn(r, priv);
741 }
742 return result;
743}
744void ref_remove_duplicates(struct ref *ref_map)
746{
747 struct string_list refs = STRING_LIST_INIT_NODUP;
748 struct string_list_item *item = NULL;
749 struct ref *prev = NULL, *next = NULL;
750 for (; ref_map; prev = ref_map, ref_map = next) {
751 next = ref_map->next;
752 if (!ref_map->peer_ref)
753 continue;
754 item = string_list_lookup(&refs, ref_map->peer_ref->name);
756 if (item) {
757 if (strcmp(((struct ref *)item->util)->name,
758 ref_map->name))
759 die("%s tracks both %s and %s",
760 ref_map->peer_ref->name,
761 ((struct ref *)item->util)->name,
762 ref_map->name);
763 prev->next = ref_map->next;
764 free(ref_map->peer_ref);
765 free(ref_map);
766 ref_map = prev; /* skip this; we freed it */
767 continue;
768 }
769 item = string_list_insert(&refs, ref_map->peer_ref->name);
771 item->util = ref_map;
772 }
773 string_list_clear(&refs, 0);
774}
775int remote_has_url(struct remote *remote, const char *url)
777{
778 int i;
779 for (i = 0; i < remote->url_nr; i++) {
780 if (!strcmp(remote->url[i], url))
781 return 1;
782 }
783 return 0;
784}
785static int match_name_with_pattern(const char *key, const char *name,
787 const char *value, char **result)
788{
789 const char *kstar = strchr(key, '*');
790 size_t klen;
791 size_t ksuffixlen;
792 size_t namelen;
793 int ret;
794 if (!kstar)
795 die("Key '%s' of pattern had no '*'", key);
796 klen = kstar - key;
797 ksuffixlen = strlen(kstar + 1);
798 namelen = strlen(name);
799 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
800 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
801 if (ret && value) {
802 const char *vstar = strchr(value, '*');
803 size_t vlen;
804 size_t vsuffixlen;
805 if (!vstar)
806 die("Value '%s' of pattern has no '*'", value);
807 vlen = vstar - value;
808 vsuffixlen = strlen(vstar + 1);
809 *result = xmalloc(vlen + vsuffixlen +
810 strlen(name) -
811 klen - ksuffixlen + 1);
812 strncpy(*result, value, vlen);
813 strncpy(*result + vlen,
814 name + klen, namelen - klen - ksuffixlen);
815 strcpy(*result + vlen + namelen - klen - ksuffixlen,
816 vstar + 1);
817 }
818 return ret;
819}
820static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
822{
823 int i;
824 int find_src = !query->src;
825 if (find_src && !query->dst)
827 return error("query_refspecs: need either src or dst");
828 for (i = 0; i < ref_count; i++) {
830 struct refspec *refspec = &refs[i];
831 const char *key = find_src ? refspec->dst : refspec->src;
832 const char *value = find_src ? refspec->src : refspec->dst;
833 const char *needle = find_src ? query->dst : query->src;
834 char **result = find_src ? &query->src : &query->dst;
835 if (!refspec->dst)
837 continue;
838 if (refspec->pattern) {
839 if (match_name_with_pattern(key, needle, value, result)) {
840 query->force = refspec->force;
841 return 0;
842 }
843 } else if (!strcmp(needle, key)) {
844 *result = xstrdup(value);
845 query->force = refspec->force;
846 return 0;
847 }
848 }
849 return -1;
850}
851char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
853 const char *name)
854{
855 struct refspec query;
856 memset(&query, 0, sizeof(struct refspec));
858 query.src = (char *)name;
859 if (query_refspecs(refspecs, nr_refspec, &query))
861 return NULL;
862 return query.dst;
864}
865int remote_find_tracking(struct remote *remote, struct refspec *refspec)
867{
868 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
869}
870static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
872 const char *name)
873{
874 size_t len = strlen(name);
875 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
876 memcpy(ref->name, prefix, prefixlen);
877 memcpy(ref->name + prefixlen, name, len);
878 return ref;
879}
880struct ref *alloc_ref(const char *name)
882{
883 return alloc_ref_with_prefix("", 0, name);
884}
885struct ref *copy_ref(const struct ref *ref)
887{
888 struct ref *cpy;
889 size_t len;
890 if (!ref)
891 return NULL;
892 len = strlen(ref->name);
893 cpy = xmalloc(sizeof(struct ref) + len + 1);
894 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
895 cpy->next = NULL;
896 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
897 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
898 cpy->peer_ref = copy_ref(ref->peer_ref);
899 return cpy;
900}
901struct ref *copy_ref_list(const struct ref *ref)
903{
904 struct ref *ret = NULL;
905 struct ref **tail = &ret;
906 while (ref) {
907 *tail = copy_ref(ref);
908 ref = ref->next;
909 tail = &((*tail)->next);
910 }
911 return ret;
912}
913static void free_ref(struct ref *ref)
915{
916 if (!ref)
917 return;
918 free_ref(ref->peer_ref);
919 free(ref->remote_status);
920 free(ref->symref);
921 free(ref);
922}
923void free_refs(struct ref *ref)
925{
926 struct ref *next;
927 while (ref) {
928 next = ref->next;
929 free_ref(ref);
930 ref = next;
931 }
932}
933int ref_compare_name(const void *va, const void *vb)
935{
936 const struct ref *a = va, *b = vb;
937 return strcmp(a->name, b->name);
938}
939static void *ref_list_get_next(const void *a)
941{
942 return ((const struct ref *)a)->next;
943}
944static void ref_list_set_next(void *a, void *next)
946{
947 ((struct ref *)a)->next = next;
948}
949void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
951{
952 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
953}
954static int count_refspec_match(const char *pattern,
956 struct ref *refs,
957 struct ref **matched_ref)
958{
959 int patlen = strlen(pattern);
960 struct ref *matched_weak = NULL;
961 struct ref *matched = NULL;
962 int weak_match = 0;
963 int match = 0;
964 for (weak_match = match = 0; refs; refs = refs->next) {
966 char *name = refs->name;
967 int namelen = strlen(name);
968 if (!refname_match(pattern, name, ref_rev_parse_rules))
970 continue;
971 /* A match is "weak" if it is with refs outside
973 * heads or tags, and did not specify the pattern
974 * in full (e.g. "refs/remotes/origin/master") or at
975 * least from the toplevel (e.g. "remotes/origin/master");
976 * otherwise "git push $URL master" would result in
977 * ambiguity between remotes/origin/master and heads/master
978 * at the remote site.
979 */
980 if (namelen != patlen &&
981 patlen != namelen - 5 &&
982 prefixcmp(name, "refs/heads/") &&
983 prefixcmp(name, "refs/tags/")) {
984 /* We want to catch the case where only weak
985 * matches are found and there are multiple
986 * matches, and where more than one strong
987 * matches are found, as ambiguous. One
988 * strong match with zero or more weak matches
989 * are acceptable as a unique match.
990 */
991 matched_weak = refs;
992 weak_match++;
993 }
994 else {
995 matched = refs;
996 match++;
997 }
998 }
999 if (!matched) {
1000 *matched_ref = matched_weak;
1001 return weak_match;
1002 }
1003 else {
1004 *matched_ref = matched;
1005 return match;
1006 }
1007}
1008static void tail_link_ref(struct ref *ref, struct ref ***tail)
1010{
1011 **tail = ref;
1012 while (ref->next)
1013 ref = ref->next;
1014 *tail = &ref->next;
1015}
1016static struct ref *alloc_delete_ref(void)
1018{
1019 struct ref *ref = alloc_ref("(delete)");
1020 hashclr(ref->new_sha1);
1021 return ref;
1022}
1023static struct ref *try_explicit_object_name(const char *name)
1025{
1026 unsigned char sha1[20];
1027 struct ref *ref;
1028 if (!*name)
1030 return alloc_delete_ref();
1031 if (get_sha1(name, sha1))
1032 return NULL;
1033 ref = alloc_ref(name);
1034 hashcpy(ref->new_sha1, sha1);
1035 return ref;
1036}
1037static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1039{
1040 struct ref *ret = alloc_ref(name);
1041 tail_link_ref(ret, tail);
1042 return ret;
1043}
1044static char *guess_ref(const char *name, struct ref *peer)
1046{
1047 struct strbuf buf = STRBUF_INIT;
1048 unsigned char sha1[20];
1049 const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1051 if (!r)
1052 return NULL;
1053 if (!prefixcmp(r, "refs/heads/"))
1055 strbuf_addstr(&buf, "refs/heads/");
1056 else if (!prefixcmp(r, "refs/tags/"))
1057 strbuf_addstr(&buf, "refs/tags/");
1058 else
1059 return NULL;
1060 strbuf_addstr(&buf, name);
1062 return strbuf_detach(&buf, NULL);
1063}
1064static int match_explicit(struct ref *src, struct ref *dst,
1066 struct ref ***dst_tail,
1067 struct refspec *rs)
1068{
1069 struct ref *matched_src, *matched_dst;
1070 int copy_src;
1071 const char *dst_value = rs->dst;
1073 char *dst_guess;
1074 if (rs->pattern || rs->matching)
1076 return 0;
1077 matched_src = matched_dst = NULL;
1079 switch (count_refspec_match(rs->src, src, &matched_src)) {
1080 case 1:
1081 copy_src = 1;
1082 break;
1083 case 0:
1084 /* The source could be in the get_sha1() format
1085 * not a reference name. :refs/other is a
1086 * way to delete 'other' ref at the remote end.
1087 */
1088 matched_src = try_explicit_object_name(rs->src);
1089 if (!matched_src)
1090 return error("src refspec %s does not match any.", rs->src);
1091 copy_src = 0;
1092 break;
1093 default:
1094 return error("src refspec %s matches more than one.", rs->src);
1095 }
1096 if (!dst_value) {
1098 unsigned char sha1[20];
1099 int flag;
1100 dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1102 if (!dst_value ||
1103 ((flag & REF_ISSYMREF) &&
1104 prefixcmp(dst_value, "refs/heads/")))
1105 die("%s cannot be resolved to branch.",
1106 matched_src->name);
1107 }
1108 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1110 case 1:
1111 break;
1112 case 0:
1113 if (!memcmp(dst_value, "refs/", 5))
1114 matched_dst = make_linked_ref(dst_value, dst_tail);
1115 else if (is_null_sha1(matched_src->new_sha1))
1116 error("unable to delete '%s': remote ref does not exist",
1117 dst_value);
1118 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1119 matched_dst = make_linked_ref(dst_guess, dst_tail);
1120 else
1121 error("unable to push to unqualified destination: %s\n"
1122 "The destination refspec neither matches an "
1123 "existing ref on the remote nor\n"
1124 "begins with refs/, and we are unable to "
1125 "guess a prefix based on the source ref.",
1126 dst_value);
1127 break;
1128 default:
1129 matched_dst = NULL;
1130 error("dst refspec %s matches more than one.",
1131 dst_value);
1132 break;
1133 }
1134 if (!matched_dst)
1135 return -1;
1136 if (matched_dst->peer_ref)
1137 return error("dst ref %s receives from more than one src.",
1138 matched_dst->name);
1139 else {
1140 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1141 matched_dst->force = rs->force;
1142 }
1143 return 0;
1144}
1145static int match_explicit_refs(struct ref *src, struct ref *dst,
1147 struct ref ***dst_tail, struct refspec *rs,
1148 int rs_nr)
1149{
1150 int i, errs;
1151 for (i = errs = 0; i < rs_nr; i++)
1152 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1153 return errs;
1154}
1155static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1157 int send_mirror, int direction, const struct refspec **ret_pat)
1158{
1159 const struct refspec *pat;
1160 char *name;
1161 int i;
1162 int matching_refs = -1;
1163 for (i = 0; i < rs_nr; i++) {
1164 if (rs[i].matching &&
1165 (matching_refs == -1 || rs[i].force)) {
1166 matching_refs = i;
1167 continue;
1168 }
1169 if (rs[i].pattern) {
1171 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1172 int match;
1173 if (direction == FROM_SRC)
1174 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1175 else
1176 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1177 if (match) {
1178 matching_refs = i;
1179 break;
1180 }
1181 }
1182 }
1183 if (matching_refs == -1)
1184 return NULL;
1185 pat = rs + matching_refs;
1187 if (pat->matching) {
1188 /*
1189 * "matching refs"; traditionally we pushed everything
1190 * including refs outside refs/heads/ hierarchy, but
1191 * that does not make much sense these days.
1192 */
1193 if (!send_mirror && prefixcmp(ref->name, "refs/heads/"))
1194 return NULL;
1195 name = xstrdup(ref->name);
1196 }
1197 if (ret_pat)
1198 *ret_pat = pat;
1199 return name;
1200}
1201static struct ref **tail_ref(struct ref **head)
1203{
1204 struct ref **tail = head;
1205 while (*tail)
1206 tail = &((*tail)->next);
1207 return tail;
1208}
1209struct tips {
1211 struct commit **tip;
1212 int nr, alloc;
1213};
1214static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1216{
1217 struct commit *commit;
1218 if (is_null_sha1(sha1))
1220 return;
1221 commit = lookup_commit_reference_gently(sha1, 1);
1222 if (!commit || (commit->object.flags & TMP_MARK))
1223 return;
1224 commit->object.flags |= TMP_MARK;
1225 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1226 tips->tip[tips->nr++] = commit;
1227}
1228static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1230{
1231 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1232 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1233 struct string_list_item *item;
1234 struct ref *ref;
1235 struct tips sent_tips;
1236 /*
1238 * Collect everything we know they would have at the end of
1239 * this push, and collect all tags they have.
1240 */
1241 memset(&sent_tips, 0, sizeof(sent_tips));
1242 for (ref = *dst; ref; ref = ref->next) {
1243 if (ref->peer_ref &&
1244 !is_null_sha1(ref->peer_ref->new_sha1))
1245 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1246 else
1247 add_to_tips(&sent_tips, ref->old_sha1);
1248 if (!prefixcmp(ref->name, "refs/tags/"))
1249 string_list_append(&dst_tag, ref->name);
1250 }
1251 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1252 sort_string_list(&dst_tag);
1254 /* Collect tags they do not have. */
1256 for (ref = src; ref; ref = ref->next) {
1257 if (prefixcmp(ref->name, "refs/tags/"))
1258 continue; /* not a tag */
1259 if (string_list_has_string(&dst_tag, ref->name))
1260 continue; /* they already have it */
1261 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1262 continue; /* be conservative */
1263 item = string_list_append(&src_tag, ref->name);
1264 item->util = ref;
1265 }
1266 string_list_clear(&dst_tag, 0);
1267 /*
1269 * At this point, src_tag lists tags that are missing from
1270 * dst, and sent_tips lists the tips we are pushing or those
1271 * that we know they already have. An element in the src_tag
1272 * that is an ancestor of any of the sent_tips needs to be
1273 * sent to the other side.
1274 */
1275 if (sent_tips.nr) {
1276 for_each_string_list_item(item, &src_tag) {
1277 struct ref *ref = item->util;
1278 struct ref *dst_ref;
1279 struct commit *commit;
1280 if (is_null_sha1(ref->new_sha1))
1282 continue;
1283 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1284 if (!commit)
1285 /* not pushing a commit, which is not an error */
1286 continue;
1287 /*
1289 * Is this tag, which they do not have, reachable from
1290 * any of the commits we are sending?
1291 */
1292 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1293 continue;
1294 /* Add it in */
1296 dst_ref = make_linked_ref(ref->name, dst_tail);
1297 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1298 dst_ref->peer_ref = copy_ref(ref);
1299 }
1300 }
1301 string_list_clear(&src_tag, 0);
1302 free(sent_tips.tip);
1303}
1304static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1306{
1307 for ( ; ref; ref = ref->next)
1308 string_list_append_nodup(ref_index, ref->name)->util = ref;
1309 sort_string_list(ref_index);
1311}
1312/*
1314 * Given the set of refs the local repository has, the set of refs the
1315 * remote repository has, and the refspec used for push, determine
1316 * what remote refs we will update and with what value by setting
1317 * peer_ref (which object is being pushed) and force (if the push is
1318 * forced) in elements of "dst". The function may add new elements to
1319 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1320 */
1321int match_push_refs(struct ref *src, struct ref **dst,
1322 int nr_refspec, const char **refspec, int flags)
1323{
1324 struct refspec *rs;
1325 int send_all = flags & MATCH_REFS_ALL;
1326 int send_mirror = flags & MATCH_REFS_MIRROR;
1327 int send_prune = flags & MATCH_REFS_PRUNE;
1328 int errs;
1329 static const char *default_refspec[] = { ":", NULL };
1330 struct ref *ref, **dst_tail = tail_ref(dst);
1331 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1332 if (!nr_refspec) {
1334 nr_refspec = 1;
1335 refspec = default_refspec;
1336 }
1337 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1338 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1339 /* pick the remainder */
1341 for (ref = src; ref; ref = ref->next) {
1342 struct string_list_item *dst_item;
1343 struct ref *dst_peer;
1344 const struct refspec *pat = NULL;
1345 char *dst_name;
1346 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1348 if (!dst_name)
1349 continue;
1350 if (!dst_ref_index.nr)
1352 prepare_ref_index(&dst_ref_index, *dst);
1353 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1355 dst_peer = dst_item ? dst_item->util : NULL;
1356 if (dst_peer) {
1357 if (dst_peer->peer_ref)
1358 /* We're already sending something to this ref. */
1359 goto free_name;
1360 } else {
1361 if (pat->matching && !(send_all || send_mirror))
1362 /*
1363 * Remote doesn't have it, and we have no
1364 * explicit pattern, and we don't have
1365 * --all nor --mirror.
1366 */
1367 goto free_name;
1368 /* Create a new one and link it */
1370 dst_peer = make_linked_ref(dst_name, &dst_tail);
1371 hashcpy(dst_peer->new_sha1, ref->new_sha1);
1372 string_list_insert(&dst_ref_index,
1373 dst_peer->name)->util = dst_peer;
1374 }
1375 dst_peer->peer_ref = copy_ref(ref);
1376 dst_peer->force = pat->force;
1377 free_name:
1378 free(dst_name);
1379 }
1380 string_list_clear(&dst_ref_index, 0);
1382 if (flags & MATCH_REFS_FOLLOW_TAGS)
1384 add_missing_tags(src, dst, &dst_tail);
1385 if (send_prune) {
1387 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1388 /* check for missing refs on the remote */
1389 for (ref = *dst; ref; ref = ref->next) {
1390 char *src_name;
1391 if (ref->peer_ref)
1393 /* We're already sending something to this ref. */
1394 continue;
1395 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1397 if (src_name) {
1398 if (!src_ref_index.nr)
1399 prepare_ref_index(&src_ref_index, src);
1400 if (!string_list_has_string(&src_ref_index,
1401 src_name))
1402 ref->peer_ref = alloc_delete_ref();
1403 free(src_name);
1404 }
1405 }
1406 string_list_clear(&src_ref_index, 0);
1407 }
1408 if (errs)
1409 return -1;
1410 return 0;
1411}
1412void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1414 int force_update)
1415{
1416 struct ref *ref;
1417 for (ref = remote_refs; ref; ref = ref->next) {
1419 int force_ref_update = ref->force || force_update;
1420 if (ref->peer_ref)
1422 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1423 else if (!send_mirror)
1424 continue;
1425 ref->deletion = is_null_sha1(ref->new_sha1);
1427 if (!ref->deletion &&
1428 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1429 ref->status = REF_STATUS_UPTODATE;
1430 continue;
1431 }
1432 /*
1434 * Decide whether an individual refspec A:B can be
1435 * pushed. The push will succeed if any of the
1436 * following are true:
1437 *
1438 * (1) the remote reference B does not exist
1439 *
1440 * (2) the remote reference B is being removed (i.e.,
1441 * pushing :B where no source is specified)
1442 *
1443 * (3) the destination is not under refs/tags/, and
1444 * if the old and new value is a commit, the new
1445 * is a descendant of the old.
1446 *
1447 * (4) it is forced using the +A:B notation, or by
1448 * passing the --force argument
1449 */
1450 if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1452 int why = 0; /* why would this push require --force? */
1453 if (!prefixcmp(ref->name, "refs/tags/"))
1455 why = REF_STATUS_REJECT_ALREADY_EXISTS;
1456 else if (!has_sha1_file(ref->old_sha1))
1457 why = REF_STATUS_REJECT_FETCH_FIRST;
1458 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1459 !lookup_commit_reference_gently(ref->new_sha1, 1))
1460 why = REF_STATUS_REJECT_NEEDS_FORCE;
1461 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1462 why = REF_STATUS_REJECT_NONFASTFORWARD;
1463 if (!force_ref_update)
1465 ref->status = why;
1466 else if (why)
1467 ref->forced_update = 1;
1468 }
1469 }
1470}
1471struct branch *branch_get(const char *name)
1473{
1474 struct branch *ret;
1475 read_config();
1477 if (!name || !*name || !strcmp(name, "HEAD"))
1478 ret = current_branch;
1479 else
1480 ret = make_branch(name, 0);
1481 if (ret && ret->remote_name) {
1482 ret->remote = remote_get(ret->remote_name);
1483 if (ret->merge_nr) {
1484 int i;
1485 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1486 for (i = 0; i < ret->merge_nr; i++) {
1487 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1488 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1489 if (remote_find_tracking(ret->remote, ret->merge[i])
1490 && !strcmp(ret->remote_name, "."))
1491 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1492 }
1493 }
1494 }
1495 return ret;
1496}
1497int branch_has_merge_config(struct branch *branch)
1499{
1500 return branch && !!branch->merge;
1501}
1502int branch_merge_matches(struct branch *branch,
1504 int i,
1505 const char *refname)
1506{
1507 if (!branch || i < 0 || i >= branch->merge_nr)
1508 return 0;
1509 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1510}
1511static int ignore_symref_update(const char *refname)
1513{
1514 unsigned char sha1[20];
1515 int flag;
1516 if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1518 return 0; /* non-existing refs are OK */
1519 return (flag & REF_ISSYMREF);
1520}
1521static struct ref *get_expanded_map(const struct ref *remote_refs,
1523 const struct refspec *refspec)
1524{
1525 const struct ref *ref;
1526 struct ref *ret = NULL;
1527 struct ref **tail = &ret;
1528 char *expn_name;
1530 for (ref = remote_refs; ref; ref = ref->next) {
1532 if (strchr(ref->name, '^'))
1533 continue; /* a dereference item */
1534 if (match_name_with_pattern(refspec->src, ref->name,
1535 refspec->dst, &expn_name) &&
1536 !ignore_symref_update(expn_name)) {
1537 struct ref *cpy = copy_ref(ref);
1538 cpy->peer_ref = alloc_ref(expn_name);
1540 free(expn_name);
1541 if (refspec->force)
1542 cpy->peer_ref->force = 1;
1543 *tail = cpy;
1544 tail = &cpy->next;
1545 }
1546 }
1547 return ret;
1549}
1550static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1552{
1553 const struct ref *ref;
1554 for (ref = refs; ref; ref = ref->next) {
1555 if (refname_match(name, ref->name, ref_fetch_rules))
1556 return ref;
1557 }
1558 return NULL;
1559}
1560struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1562{
1563 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1564 if (!ref)
1566 return NULL;
1567 return copy_ref(ref);
1569}
1570static struct ref *get_local_ref(const char *name)
1572{
1573 if (!name || name[0] == '\0')
1574 return NULL;
1575 if (!prefixcmp(name, "refs/"))
1577 return alloc_ref(name);
1578 if (!prefixcmp(name, "heads/") ||
1580 !prefixcmp(name, "tags/") ||
1581 !prefixcmp(name, "remotes/"))
1582 return alloc_ref_with_prefix("refs/", 5, name);
1583 return alloc_ref_with_prefix("refs/heads/", 11, name);
1585}
1586int get_fetch_map(const struct ref *remote_refs,
1588 const struct refspec *refspec,
1589 struct ref ***tail,
1590 int missing_ok)
1591{
1592 struct ref *ref_map, **rmp;
1593 if (refspec->pattern) {
1595 ref_map = get_expanded_map(remote_refs, refspec);
1596 } else {
1597 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1598 if (refspec->exact_sha1) {
1600 ref_map = alloc_ref(name);
1601 get_sha1_hex(name, ref_map->old_sha1);
1602 } else {
1603 ref_map = get_remote_ref(remote_refs, name);
1604 }
1605 if (!missing_ok && !ref_map)
1606 die("Couldn't find remote ref %s", name);
1607 if (ref_map) {
1608 ref_map->peer_ref = get_local_ref(refspec->dst);
1609 if (ref_map->peer_ref && refspec->force)
1610 ref_map->peer_ref->force = 1;
1611 }
1612 }
1613 for (rmp = &ref_map; *rmp; ) {
1615 if ((*rmp)->peer_ref) {
1616 if (prefixcmp((*rmp)->peer_ref->name, "refs/") ||
1617 check_refname_format((*rmp)->peer_ref->name, 0)) {
1618 struct ref *ignore = *rmp;
1619 error("* Ignoring funny ref '%s' locally",
1620 (*rmp)->peer_ref->name);
1621 *rmp = (*rmp)->next;
1622 free(ignore->peer_ref);
1623 free(ignore);
1624 continue;
1625 }
1626 }
1627 rmp = &((*rmp)->next);
1628 }
1629 if (ref_map)
1631 tail_link_ref(ref_map, tail);
1632 return 0;
1634}
1635int resolve_remote_symref(struct ref *ref, struct ref *list)
1637{
1638 if (!ref->symref)
1639 return 0;
1640 for (; list; list = list->next)
1641 if (!strcmp(ref->symref, list->name)) {
1642 hashcpy(ref->old_sha1, list->old_sha1);
1643 return 0;
1644 }
1645 return 1;
1646}
1647static void unmark_and_free(struct commit_list *list, unsigned int mark)
1649{
1650 while (list) {
1651 struct commit_list *temp = list;
1652 temp->item->object.flags &= ~mark;
1653 list = temp->next;
1654 free(temp);
1655 }
1656}
1657int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1659{
1660 struct object *o;
1661 struct commit *old, *new;
1662 struct commit_list *list, *used;
1663 int found = 0;
1664 /*
1666 * Both new and old must be commit-ish and new is descendant of
1667 * old. Otherwise we require --force.
1668 */
1669 o = deref_tag(parse_object(old_sha1), NULL, 0);
1670 if (!o || o->type != OBJ_COMMIT)
1671 return 0;
1672 old = (struct commit *) o;
1673 o = deref_tag(parse_object(new_sha1), NULL, 0);
1675 if (!o || o->type != OBJ_COMMIT)
1676 return 0;
1677 new = (struct commit *) o;
1678 if (parse_commit(new) < 0)
1680 return 0;
1681 used = list = NULL;
1683 commit_list_insert(new, &list);
1684 while (list) {
1685 new = pop_most_recent_commit(&list, TMP_MARK);
1686 commit_list_insert(new, &used);
1687 if (new == old) {
1688 found = 1;
1689 break;
1690 }
1691 }
1692 unmark_and_free(list, TMP_MARK);
1693 unmark_and_free(used, TMP_MARK);
1694 return found;
1695}
1696/*
1698 * Compare a branch with its upstream, and save their differences (number
1699 * of commits) in *num_ours and *num_theirs.
1700 *
1701 * Return 0 if branch has no upstream (no base), -1 if upstream is missing
1702 * (with "gone" base), otherwise 1 (with base).
1703 */
1704int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1705{
1706 unsigned char sha1[20];
1707 struct commit *ours, *theirs;
1708 char symmetric[84];
1709 struct rev_info revs;
1710 const char *rev_argv[10], *base;
1711 int rev_argc;
1712 /* Cannot stat unless we are marked to build on top of somebody else. */
1714 if (!branch ||
1715 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1716 return 0;
1717 /* Cannot stat if what we used to build on no longer exists */
1719 base = branch->merge[0]->dst;
1720 if (read_ref(base, sha1))
1721 return -1;
1722 theirs = lookup_commit_reference(sha1);
1723 if (!theirs)
1724 return -1;
1725 if (read_ref(branch->refname, sha1))
1727 return -1;
1728 ours = lookup_commit_reference(sha1);
1729 if (!ours)
1730 return -1;
1731 /* are we the same? */
1733 if (theirs == ours) {
1734 *num_theirs = *num_ours = 0;
1735 return 1;
1736 }
1737 /* Run "rev-list --left-right ours...theirs" internally... */
1739 rev_argc = 0;
1740 rev_argv[rev_argc++] = NULL;
1741 rev_argv[rev_argc++] = "--left-right";
1742 rev_argv[rev_argc++] = symmetric;
1743 rev_argv[rev_argc++] = "--";
1744 rev_argv[rev_argc] = NULL;
1745 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1747 strcpy(symmetric + 40, "...");
1748 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1749 init_revisions(&revs, NULL);
1751 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1752 prepare_revision_walk(&revs);
1753 /* ... and count the commits on each side. */
1755 *num_ours = 0;
1756 *num_theirs = 0;
1757 while (1) {
1758 struct commit *c = get_revision(&revs);
1759 if (!c)
1760 break;
1761 if (c->object.flags & SYMMETRIC_LEFT)
1762 (*num_ours)++;
1763 else
1764 (*num_theirs)++;
1765 }
1766 /* clear object flags smudged by the above traversal */
1768 clear_commit_marks(ours, ALL_REV_FLAGS);
1769 clear_commit_marks(theirs, ALL_REV_FLAGS);
1770 return 1;
1771}
1772/*
1774 * Return true when there is anything to report, otherwise false.
1775 */
1776int format_tracking_info(struct branch *branch, struct strbuf *sb)
1777{
1778 int ours, theirs;
1779 const char *base;
1780 int upstream_is_gone = 0;
1781 switch (stat_tracking_info(branch, &ours, &theirs)) {
1783 case 0:
1784 /* no base */
1785 return 0;
1786 case -1:
1787 /* with "gone" base */
1788 upstream_is_gone = 1;
1789 break;
1790 default:
1791 /* with base */
1792 break;
1793 }
1794 base = branch->merge[0]->dst;
1796 base = shorten_unambiguous_ref(base, 0);
1797 if (upstream_is_gone) {
1798 strbuf_addf(sb,
1799 _("Your branch is based on '%s', but the upstream is gone.\n"),
1800 base);
1801 if (advice_status_hints)
1802 strbuf_addf(sb,
1803 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
1804 } else if (!ours && !theirs) {
1805 strbuf_addf(sb,
1806 _("Your branch is up-to-date with '%s'.\n"),
1807 base);
1808 } else if (!theirs) {
1809 strbuf_addf(sb,
1810 Q_("Your branch is ahead of '%s' by %d commit.\n",
1811 "Your branch is ahead of '%s' by %d commits.\n",
1812 ours),
1813 base, ours);
1814 if (advice_status_hints)
1815 strbuf_addf(sb,
1816 _(" (use \"git push\" to publish your local commits)\n"));
1817 } else if (!ours) {
1818 strbuf_addf(sb,
1819 Q_("Your branch is behind '%s' by %d commit, "
1820 "and can be fast-forwarded.\n",
1821 "Your branch is behind '%s' by %d commits, "
1822 "and can be fast-forwarded.\n",
1823 theirs),
1824 base, theirs);
1825 if (advice_status_hints)
1826 strbuf_addf(sb,
1827 _(" (use \"git pull\" to update your local branch)\n"));
1828 } else {
1829 strbuf_addf(sb,
1830 Q_("Your branch and '%s' have diverged,\n"
1831 "and have %d and %d different commit each, "
1832 "respectively.\n",
1833 "Your branch and '%s' have diverged,\n"
1834 "and have %d and %d different commits each, "
1835 "respectively.\n",
1836 theirs),
1837 base, ours, theirs);
1838 if (advice_status_hints)
1839 strbuf_addf(sb,
1840 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
1841 }
1842 return 1;
1843}
1844static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1846{
1847 struct ref ***local_tail = cb_data;
1848 struct ref *ref;
1849 int len;
1850 /* we already know it starts with refs/ to get here */
1852 if (check_refname_format(refname + 5, 0))
1853 return 0;
1854 len = strlen(refname) + 1;
1856 ref = xcalloc(1, sizeof(*ref) + len);
1857 hashcpy(ref->new_sha1, sha1);
1858 memcpy(ref->name, refname, len);
1859 **local_tail = ref;
1860 *local_tail = &ref->next;
1861 return 0;
1862}
1863struct ref *get_local_heads(void)
1865{
1866 struct ref *local_refs = NULL, **local_tail = &local_refs;
1867 for_each_ref(one_local_ref, &local_tail);
1868 return local_refs;
1869}
1870struct ref *guess_remote_head(const struct ref *head,
1872 const struct ref *refs,
1873 int all)
1874{
1875 const struct ref *r;
1876 struct ref *list = NULL;
1877 struct ref **tail = &list;
1878 if (!head)
1880 return NULL;
1881 /*
1883 * Some transports support directly peeking at
1884 * where HEAD points; if that is the case, then
1885 * we don't have to guess.
1886 */
1887 if (head->symref)
1888 return copy_ref(find_ref_by_name(refs, head->symref));
1889 /* If refs/heads/master could be right, it is. */
1891 if (!all) {
1892 r = find_ref_by_name(refs, "refs/heads/master");
1893 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1894 return copy_ref(r);
1895 }
1896 /* Look for another ref that points there */
1898 for (r = refs; r; r = r->next) {
1899 if (r != head &&
1900 !prefixcmp(r->name, "refs/heads/") &&
1901 !hashcmp(r->old_sha1, head->old_sha1)) {
1902 *tail = copy_ref(r);
1903 tail = &((*tail)->next);
1904 if (!all)
1905 break;
1906 }
1907 }
1908 return list;
1910}
1911struct stale_heads_info {
1913 struct string_list *ref_names;
1914 struct ref **stale_refs_tail;
1915 struct refspec *refs;
1916 int ref_count;
1917};
1918static int get_stale_heads_cb(const char *refname,
1920 const unsigned char *sha1, int flags, void *cb_data)
1921{
1922 struct stale_heads_info *info = cb_data;
1923 struct refspec query;
1924 memset(&query, 0, sizeof(struct refspec));
1925 query.dst = (char *)refname;
1926 if (query_refspecs(info->refs, info->ref_count, &query))
1928 return 0; /* No matches */
1929 /*
1931 * If we did find a suitable refspec and it's not a symref and
1932 * it's not in the list of refs that currently exist in that
1933 * remote we consider it to be stale.
1934 */
1935 if (!((flags & REF_ISSYMREF) ||
1936 string_list_has_string(info->ref_names, query.src))) {
1937 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1938 hashcpy(ref->new_sha1, sha1);
1939 }
1940 free(query.src);
1942 return 0;
1943}
1944struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
1946{
1947 struct ref *ref, *stale_refs = NULL;
1948 struct string_list ref_names = STRING_LIST_INIT_NODUP;
1949 struct stale_heads_info info;
1950 info.ref_names = &ref_names;
1951 info.stale_refs_tail = &stale_refs;
1952 info.refs = refs;
1953 info.ref_count = ref_count;
1954 for (ref = fetch_map; ref; ref = ref->next)
1955 string_list_append(&ref_names, ref->name);
1956 sort_string_list(&ref_names);
1957 for_each_ref(get_stale_heads_cb, &info);
1958 string_list_clear(&ref_names, 0);
1959 return stale_refs;
1960}