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 *branch_pushremote_name;
53static const char *pushremote_name;
54static int explicit_default_remote_name;
55static struct rewrites rewrites;
57static struct rewrites rewrites_push;
58#define BUF_SIZE (2048)
60static char buffer[BUF_SIZE];
61static int valid_remote(const struct remote *remote)
63{
64 return (!!remote->url) || (!!remote->foreign_vcs);
65}
66static const char *alias_url(const char *url, struct rewrites *r)
68{
69 int i, j;
70 char *ret;
71 struct counted_string *longest;
72 int longest_i;
73 longest = NULL;
75 longest_i = -1;
76 for (i = 0; i < r->rewrite_nr; i++) {
77 if (!r->rewrite[i])
78 continue;
79 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
80 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
81 (!longest ||
82 longest->len < r->rewrite[i]->instead_of[j].len)) {
83 longest = &(r->rewrite[i]->instead_of[j]);
84 longest_i = i;
85 }
86 }
87 }
88 if (!longest)
89 return url;
90 ret = xmalloc(r->rewrite[longest_i]->baselen +
92 (strlen(url) - longest->len) + 1);
93 strcpy(ret, r->rewrite[longest_i]->base);
94 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
95 return ret;
96}
97static void add_push_refspec(struct remote *remote, const char *ref)
99{
100 ALLOC_GROW(remote->push_refspec,
101 remote->push_refspec_nr + 1,
102 remote->push_refspec_alloc);
103 remote->push_refspec[remote->push_refspec_nr++] = ref;
104}
105static void add_fetch_refspec(struct remote *remote, const char *ref)
107{
108 ALLOC_GROW(remote->fetch_refspec,
109 remote->fetch_refspec_nr + 1,
110 remote->fetch_refspec_alloc);
111 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
112}
113static void add_url(struct remote *remote, const char *url)
115{
116 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
117 remote->url[remote->url_nr++] = url;
118}
119static void add_pushurl(struct remote *remote, const char *pushurl)
121{
122 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
123 remote->pushurl[remote->pushurl_nr++] = pushurl;
124}
125static void add_pushurl_alias(struct remote *remote, const char *url)
127{
128 const char *pushurl = alias_url(url, &rewrites_push);
129 if (pushurl != url)
130 add_pushurl(remote, pushurl);
131}
132static void add_url_alias(struct remote *remote, const char *url)
134{
135 add_url(remote, alias_url(url, &rewrites));
136 add_pushurl_alias(remote, url);
137}
138static struct remote *make_remote(const char *name, int len)
140{
141 struct remote *ret;
142 int i;
143 for (i = 0; i < remotes_nr; i++) {
145 if (len ? (!strncmp(name, remotes[i]->name, len) &&
146 !remotes[i]->name[len]) :
147 !strcmp(name, remotes[i]->name))
148 return remotes[i];
149 }
150 ret = xcalloc(1, sizeof(struct remote));
152 ret->prune = -1; /* unspecified */
153 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
154 remotes[remotes_nr++] = ret;
155 if (len)
156 ret->name = xstrndup(name, len);
157 else
158 ret->name = xstrdup(name);
159 return ret;
160}
161static void add_merge(struct branch *branch, const char *name)
163{
164 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
165 branch->merge_alloc);
166 branch->merge_name[branch->merge_nr++] = name;
167}
168static struct branch *make_branch(const char *name, int len)
170{
171 struct branch *ret;
172 int i;
173 for (i = 0; i < branches_nr; i++) {
175 if (len ? (!strncmp(name, branches[i]->name, len) &&
176 !branches[i]->name[len]) :
177 !strcmp(name, branches[i]->name))
178 return branches[i];
179 }
180 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
182 ret = xcalloc(1, sizeof(struct branch));
183 branches[branches_nr++] = ret;
184 if (len)
185 ret->name = xstrndup(name, len);
186 else
187 ret->name = xstrdup(name);
188 ret->refname = xstrfmt("refs/heads/%s", ret->name);
189 return ret;
191}
192static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
194{
195 struct rewrite *ret;
196 int i;
197 for (i = 0; i < r->rewrite_nr; i++) {
199 if (len
200 ? (len == r->rewrite[i]->baselen &&
201 !strncmp(base, r->rewrite[i]->base, len))
202 : !strcmp(base, r->rewrite[i]->base))
203 return r->rewrite[i];
204 }
205 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
207 ret = xcalloc(1, sizeof(struct rewrite));
208 r->rewrite[r->rewrite_nr++] = ret;
209 if (len) {
210 ret->base = xstrndup(base, len);
211 ret->baselen = len;
212 }
213 else {
214 ret->base = xstrdup(base);
215 ret->baselen = strlen(base);
216 }
217 return ret;
218}
219static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
221{
222 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
223 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
224 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
225 rewrite->instead_of_nr++;
226}
227static void read_remotes_file(struct remote *remote)
229{
230 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
231 if (!f)
233 return;
234 remote->origin = REMOTE_REMOTES;
235 while (fgets(buffer, BUF_SIZE, f)) {
236 int value_list;
237 char *s, *p;
238 if (starts_with(buffer, "URL:")) {
240 value_list = 0;
241 s = buffer + 4;
242 } else if (starts_with(buffer, "Push:")) {
243 value_list = 1;
244 s = buffer + 5;
245 } else if (starts_with(buffer, "Pull:")) {
246 value_list = 2;
247 s = buffer + 5;
248 } else
249 continue;
250 while (isspace(*s))
252 s++;
253 if (!*s)
254 continue;
255 p = s + strlen(s);
257 while (isspace(p[-1]))
258 *--p = 0;
259 switch (value_list) {
261 case 0:
262 add_url_alias(remote, xstrdup(s));
263 break;
264 case 1:
265 add_push_refspec(remote, xstrdup(s));
266 break;
267 case 2:
268 add_fetch_refspec(remote, xstrdup(s));
269 break;
270 }
271 }
272 fclose(f);
273}
274static void read_branches_file(struct remote *remote)
276{
277 char *frag;
278 struct strbuf branch = STRBUF_INIT;
279 int n = 1000;
280 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
281 char *s, *p;
282 int len;
283 if (!f)
285 return;
286 s = fgets(buffer, BUF_SIZE, f);
287 fclose(f);
288 if (!s)
289 return;
290 while (isspace(*s))
291 s++;
292 if (!*s)
293 return;
294 remote->origin = REMOTE_BRANCHES;
295 p = s + strlen(s);
296 while (isspace(p[-1]))
297 *--p = 0;
298 len = p - s;
299 p = xmalloc(len + 1);
300 strcpy(p, s);
301 /*
303 * The branches file would have URL and optionally
304 * #branch specified. The "master" (or specified) branch is
305 * fetched and stored in the local branch of the same name.
306 */
307 frag = strchr(p, '#');
308 if (frag) {
309 *(frag++) = '\0';
310 strbuf_addf(&branch, "refs/heads/%s", frag);
311 } else
312 strbuf_addstr(&branch, "refs/heads/master");
313 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
315 add_url_alias(remote, p);
316 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
317 /*
318 * Cogito compatible push: push current HEAD to remote #branch
319 * (master if missing)
320 */
321 strbuf_init(&branch, 0);
322 strbuf_addstr(&branch, "HEAD");
323 if (frag)
324 strbuf_addf(&branch, ":refs/heads/%s", frag);
325 else
326 strbuf_addstr(&branch, ":refs/heads/master");
327 add_push_refspec(remote, strbuf_detach(&branch, NULL));
328 remote->fetch_tags = 1; /* always auto-follow */
329}
330static int handle_config(const char *key, const char *value, void *cb)
332{
333 const char *name;
334 const char *subkey;
335 struct remote *remote;
336 struct branch *branch;
337 if (starts_with(key, "branch.")) {
338 name = key + 7;
339 subkey = strrchr(name, '.');
340 if (!subkey)
341 return 0;
342 branch = make_branch(name, subkey - name);
343 if (!strcmp(subkey, ".remote")) {
344 if (git_config_string(&branch->remote_name, key, value))
345 return -1;
346 if (branch == current_branch) {
347 default_remote_name = branch->remote_name;
348 explicit_default_remote_name = 1;
349 }
350 } else if (!strcmp(subkey, ".pushremote")) {
351 if (branch == current_branch)
352 if (git_config_string(&branch_pushremote_name, key, value))
353 return -1;
354 } else if (!strcmp(subkey, ".merge")) {
355 if (!value)
356 return config_error_nonbool(key);
357 add_merge(branch, xstrdup(value));
358 }
359 return 0;
360 }
361 if (starts_with(key, "url.")) {
362 struct rewrite *rewrite;
363 name = key + 4;
364 subkey = strrchr(name, '.');
365 if (!subkey)
366 return 0;
367 if (!strcmp(subkey, ".insteadof")) {
368 rewrite = make_rewrite(&rewrites, name, subkey - name);
369 if (!value)
370 return config_error_nonbool(key);
371 add_instead_of(rewrite, xstrdup(value));
372 } else if (!strcmp(subkey, ".pushinsteadof")) {
373 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
374 if (!value)
375 return config_error_nonbool(key);
376 add_instead_of(rewrite, xstrdup(value));
377 }
378 }
379 if (!starts_with(key, "remote."))
381 return 0;
382 name = key + 7;
383 /* Handle remote.* variables */
385 if (!strcmp(name, "pushdefault"))
386 return git_config_string(&pushremote_name, key, value);
387 /* Handle remote.<name>.* variables */
389 if (*name == '/') {
390 warning("Config remote shorthand cannot begin with '/': %s",
391 name);
392 return 0;
393 }
394 subkey = strrchr(name, '.');
395 if (!subkey)
396 return 0;
397 remote = make_remote(name, subkey - name);
398 remote->origin = REMOTE_CONFIG;
399 if (!strcmp(subkey, ".mirror"))
400 remote->mirror = git_config_bool(key, value);
401 else if (!strcmp(subkey, ".skipdefaultupdate"))
402 remote->skip_default_update = git_config_bool(key, value);
403 else if (!strcmp(subkey, ".skipfetchall"))
404 remote->skip_default_update = git_config_bool(key, value);
405 else if (!strcmp(subkey, ".prune"))
406 remote->prune = 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 = "origin";
484 current_branch = NULL;
485 head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
486 if (head_ref && (flag & REF_ISSYMREF) &&
487 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
488 current_branch = make_branch(head_ref, 0);
489 }
490 git_config(handle_config, NULL);
491 if (branch_pushremote_name) {
492 free((char *)pushremote_name);
493 pushremote_name = branch_pushremote_name;
494 }
495 alias_all_urls();
496}
497/*
499 * This function frees a refspec array.
500 * Warning: code paths should be checked to ensure that the src
501 * and dst pointers are always freeable pointers as well
502 * as the refspec pointer itself.
503 */
504static void free_refspecs(struct refspec *refspec, int nr_refspec)
505{
506 int i;
507 if (!refspec)
509 return;
510 for (i = 0; i < nr_refspec; i++) {
512 free(refspec[i].src);
513 free(refspec[i].dst);
514 }
515 free(refspec);
516}
517static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
519{
520 int i;
521 struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
522 for (i = 0; i < nr_refspec; i++) {
524 size_t llen;
525 int is_glob;
526 const char *lhs, *rhs;
527 int flags;
528 is_glob = 0;
530 lhs = refspec[i];
532 if (*lhs == '+') {
533 rs[i].force = 1;
534 lhs++;
535 }
536 rhs = strrchr(lhs, ':');
538 /*
540 * Before going on, special case ":" (or "+:") as a refspec
541 * for pushing matching refs.
542 */
543 if (!fetch && rhs == lhs && rhs[1] == '\0') {
544 rs[i].matching = 1;
545 continue;
546 }
547 if (rhs) {
549 size_t rlen = strlen(++rhs);
550 is_glob = (1 <= rlen && strchr(rhs, '*'));
551 rs[i].dst = xstrndup(rhs, rlen);
552 }
553 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
555 if (1 <= llen && memchr(lhs, '*', llen)) {
556 if ((rhs && !is_glob) || (!rhs && fetch))
557 goto invalid;
558 is_glob = 1;
559 } else if (rhs && is_glob) {
560 goto invalid;
561 }
562 rs[i].pattern = is_glob;
564 rs[i].src = xstrndup(lhs, llen);
565 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
566 if (fetch) {
568 unsigned char unused[40];
569 /* LHS */
571 if (!*rs[i].src)
572 ; /* empty is ok; it means "HEAD" */
573 else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
574 rs[i].exact_sha1 = 1; /* ok */
575 else if (!check_refname_format(rs[i].src, flags))
576 ; /* valid looking ref is ok */
577 else
578 goto invalid;
579 /* RHS */
580 if (!rs[i].dst)
581 ; /* missing is ok; it is the same as empty */
582 else if (!*rs[i].dst)
583 ; /* empty is ok; it means "do not store" */
584 else if (!check_refname_format(rs[i].dst, flags))
585 ; /* valid looking ref is ok */
586 else
587 goto invalid;
588 } else {
589 /*
590 * LHS
591 * - empty is allowed; it means delete.
592 * - when wildcarded, it must be a valid looking ref.
593 * - otherwise, it must be an extended SHA-1, but
594 * there is no existing way to validate this.
595 */
596 if (!*rs[i].src)
597 ; /* empty is ok */
598 else if (is_glob) {
599 if (check_refname_format(rs[i].src, flags))
600 goto invalid;
601 }
602 else
603 ; /* anything goes, for now */
604 /*
605 * RHS
606 * - missing is allowed, but LHS then must be a
607 * valid looking ref.
608 * - empty is not allowed.
609 * - otherwise it must be a valid looking ref.
610 */
611 if (!rs[i].dst) {
612 if (check_refname_format(rs[i].src, flags))
613 goto invalid;
614 } else if (!*rs[i].dst) {
615 goto invalid;
616 } else {
617 if (check_refname_format(rs[i].dst, flags))
618 goto invalid;
619 }
620 }
621 }
622 return rs;
623 invalid:
625 if (verify) {
626 /*
627 * nr_refspec must be greater than zero and i must be valid
628 * since it is only possible to reach this point from within
629 * the for loop above.
630 */
631 free_refspecs(rs, i+1);
632 return NULL;
633 }
634 die("Invalid refspec '%s'", refspec[i]);
635}
636int valid_fetch_refspec(const char *fetch_refspec_str)
638{
639 struct refspec *refspec;
640 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
642 free_refspecs(refspec, 1);
643 return !!refspec;
644}
645struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
647{
648 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
649}
650static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
652{
653 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
654}
655void free_refspec(int nr_refspec, struct refspec *refspec)
657{
658 int i;
659 for (i = 0; i < nr_refspec; i++) {
660 free(refspec[i].src);
661 free(refspec[i].dst);
662 }
663 free(refspec);
664}
665static int valid_remote_nick(const char *name)
667{
668 if (!name[0] || is_dot_or_dotdot(name))
669 return 0;
670 return !strchr(name, '/'); /* no slash */
671}
672static struct remote *remote_get_1(const char *name, const char *pushremote_name)
674{
675 struct remote *ret;
676 int name_given = 0;
677 if (name)
679 name_given = 1;
680 else {
681 if (pushremote_name) {
682 name = pushremote_name;
683 name_given = 1;
684 } else {
685 name = default_remote_name;
686 name_given = explicit_default_remote_name;
687 }
688 }
689 ret = make_remote(name, 0);
691 if (valid_remote_nick(name)) {
692 if (!valid_remote(ret))
693 read_remotes_file(ret);
694 if (!valid_remote(ret))
695 read_branches_file(ret);
696 }
697 if (name_given && !valid_remote(ret))
698 add_url_alias(ret, name);
699 if (!valid_remote(ret))
700 return NULL;
701 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
702 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
703 return ret;
704}
705struct remote *remote_get(const char *name)
707{
708 read_config();
709 return remote_get_1(name, NULL);
710}
711struct remote *pushremote_get(const char *name)
713{
714 read_config();
715 return remote_get_1(name, pushremote_name);
716}
717int remote_is_configured(const char *name)
719{
720 int i;
721 read_config();
722 for (i = 0; i < remotes_nr; i++)
724 if (!strcmp(name, remotes[i]->name))
725 return 1;
726 return 0;
727}
728int for_each_remote(each_remote_fn fn, void *priv)
730{
731 int i, result = 0;
732 read_config();
733 for (i = 0; i < remotes_nr && !result; i++) {
734 struct remote *r = remotes[i];
735 if (!r)
736 continue;
737 if (!r->fetch)
738 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
739 r->fetch_refspec);
740 if (!r->push)
741 r->push = parse_push_refspec(r->push_refspec_nr,
742 r->push_refspec);
743 result = fn(r, priv);
744 }
745 return result;
746}
747static void handle_duplicate(struct ref *ref1, struct ref *ref2)
749{
750 if (strcmp(ref1->name, ref2->name)) {
751 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
752 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
753 die(_("Cannot fetch both %s and %s to %s"),
754 ref1->name, ref2->name, ref2->peer_ref->name);
755 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
756 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
757 warning(_("%s usually tracks %s, not %s"),
758 ref2->peer_ref->name, ref2->name, ref1->name);
759 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
760 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
761 die(_("%s tracks both %s and %s"),
762 ref2->peer_ref->name, ref1->name, ref2->name);
763 } else {
764 /*
765 * This last possibility doesn't occur because
766 * FETCH_HEAD_IGNORE entries always appear at
767 * the end of the list.
768 */
769 die(_("Internal error"));
770 }
771 }
772 free(ref2->peer_ref);
773 free(ref2);
774}
775struct ref *ref_remove_duplicates(struct ref *ref_map)
777{
778 struct string_list refs = STRING_LIST_INIT_NODUP;
779 struct ref *retval = NULL;
780 struct ref **p = &retval;
781 while (ref_map) {
783 struct ref *ref = ref_map;
784 ref_map = ref_map->next;
786 ref->next = NULL;
787 if (!ref->peer_ref) {
789 *p = ref;
790 p = &ref->next;
791 } else {
792 struct string_list_item *item =
793 string_list_insert(&refs, ref->peer_ref->name);
794 if (item->util) {
796 /* Entry already existed */
797 handle_duplicate((struct ref *)item->util, ref);
798 } else {
799 *p = ref;
800 p = &ref->next;
801 item->util = ref;
802 }
803 }
804 }
805 string_list_clear(&refs, 0);
807 return retval;
808}
809int remote_has_url(struct remote *remote, const char *url)
811{
812 int i;
813 for (i = 0; i < remote->url_nr; i++) {
814 if (!strcmp(remote->url[i], url))
815 return 1;
816 }
817 return 0;
818}
819static int match_name_with_pattern(const char *key, const char *name,
821 const char *value, char **result)
822{
823 const char *kstar = strchr(key, '*');
824 size_t klen;
825 size_t ksuffixlen;
826 size_t namelen;
827 int ret;
828 if (!kstar)
829 die("Key '%s' of pattern had no '*'", key);
830 klen = kstar - key;
831 ksuffixlen = strlen(kstar + 1);
832 namelen = strlen(name);
833 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
834 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
835 if (ret && value) {
836 const char *vstar = strchr(value, '*');
837 size_t vlen;
838 size_t vsuffixlen;
839 if (!vstar)
840 die("Value '%s' of pattern has no '*'", value);
841 vlen = vstar - value;
842 vsuffixlen = strlen(vstar + 1);
843 *result = xmalloc(vlen + vsuffixlen +
844 strlen(name) -
845 klen - ksuffixlen + 1);
846 strncpy(*result, value, vlen);
847 strncpy(*result + vlen,
848 name + klen, namelen - klen - ksuffixlen);
849 strcpy(*result + vlen + namelen - klen - ksuffixlen,
850 vstar + 1);
851 }
852 return ret;
853}
854static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
856{
857 int i;
858 int find_src = !query->src;
859 if (find_src && !query->dst)
861 error("query_refspecs_multiple: need either src or dst");
862 for (i = 0; i < ref_count; i++) {
864 struct refspec *refspec = &refs[i];
865 const char *key = find_src ? refspec->dst : refspec->src;
866 const char *value = find_src ? refspec->src : refspec->dst;
867 const char *needle = find_src ? query->dst : query->src;
868 char **result = find_src ? &query->src : &query->dst;
869 if (!refspec->dst)
871 continue;
872 if (refspec->pattern) {
873 if (match_name_with_pattern(key, needle, value, result))
874 string_list_append_nodup(results, *result);
875 } else if (!strcmp(needle, key)) {
876 string_list_append(results, value);
877 }
878 }
879}
880int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
882{
883 int i;
884 int find_src = !query->src;
885 const char *needle = find_src ? query->dst : query->src;
886 char **result = find_src ? &query->src : &query->dst;
887 if (find_src && !query->dst)
889 return error("query_refspecs: need either src or dst");
890 for (i = 0; i < ref_count; i++) {
892 struct refspec *refspec = &refs[i];
893 const char *key = find_src ? refspec->dst : refspec->src;
894 const char *value = find_src ? refspec->src : refspec->dst;
895 if (!refspec->dst)
897 continue;
898 if (refspec->pattern) {
899 if (match_name_with_pattern(key, needle, value, result)) {
900 query->force = refspec->force;
901 return 0;
902 }
903 } else if (!strcmp(needle, key)) {
904 *result = xstrdup(value);
905 query->force = refspec->force;
906 return 0;
907 }
908 }
909 return -1;
910}
911char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
913 const char *name)
914{
915 struct refspec query;
916 memset(&query, 0, sizeof(struct refspec));
918 query.src = (char *)name;
919 if (query_refspecs(refspecs, nr_refspec, &query))
921 return NULL;
922 return query.dst;
924}
925int remote_find_tracking(struct remote *remote, struct refspec *refspec)
927{
928 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
929}
930static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
932 const char *name)
933{
934 size_t len = strlen(name);
935 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
936 memcpy(ref->name, prefix, prefixlen);
937 memcpy(ref->name + prefixlen, name, len);
938 return ref;
939}
940struct ref *alloc_ref(const char *name)
942{
943 return alloc_ref_with_prefix("", 0, name);
944}
945struct ref *copy_ref(const struct ref *ref)
947{
948 struct ref *cpy;
949 size_t len;
950 if (!ref)
951 return NULL;
952 len = strlen(ref->name);
953 cpy = xmalloc(sizeof(struct ref) + len + 1);
954 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
955 cpy->next = NULL;
956 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
957 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
958 cpy->peer_ref = copy_ref(ref->peer_ref);
959 return cpy;
960}
961struct ref *copy_ref_list(const struct ref *ref)
963{
964 struct ref *ret = NULL;
965 struct ref **tail = &ret;
966 while (ref) {
967 *tail = copy_ref(ref);
968 ref = ref->next;
969 tail = &((*tail)->next);
970 }
971 return ret;
972}
973static void free_ref(struct ref *ref)
975{
976 if (!ref)
977 return;
978 free_ref(ref->peer_ref);
979 free(ref->remote_status);
980 free(ref->symref);
981 free(ref);
982}
983void free_refs(struct ref *ref)
985{
986 struct ref *next;
987 while (ref) {
988 next = ref->next;
989 free_ref(ref);
990 ref = next;
991 }
992}
993int ref_compare_name(const void *va, const void *vb)
995{
996 const struct ref *a = va, *b = vb;
997 return strcmp(a->name, b->name);
998}
999static void *ref_list_get_next(const void *a)
1001{
1002 return ((const struct ref *)a)->next;
1003}
1004static void ref_list_set_next(void *a, void *next)
1006{
1007 ((struct ref *)a)->next = next;
1008}
1009void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1011{
1012 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1013}
1014int count_refspec_match(const char *pattern,
1016 struct ref *refs,
1017 struct ref **matched_ref)
1018{
1019 int patlen = strlen(pattern);
1020 struct ref *matched_weak = NULL;
1021 struct ref *matched = NULL;
1022 int weak_match = 0;
1023 int match = 0;
1024 for (weak_match = match = 0; refs; refs = refs->next) {
1026 char *name = refs->name;
1027 int namelen = strlen(name);
1028 if (!refname_match(pattern, name))
1030 continue;
1031 /* A match is "weak" if it is with refs outside
1033 * heads or tags, and did not specify the pattern
1034 * in full (e.g. "refs/remotes/origin/master") or at
1035 * least from the toplevel (e.g. "remotes/origin/master");
1036 * otherwise "git push $URL master" would result in
1037 * ambiguity between remotes/origin/master and heads/master
1038 * at the remote site.
1039 */
1040 if (namelen != patlen &&
1041 patlen != namelen - 5 &&
1042 !starts_with(name, "refs/heads/") &&
1043 !starts_with(name, "refs/tags/")) {
1044 /* We want to catch the case where only weak
1045 * matches are found and there are multiple
1046 * matches, and where more than one strong
1047 * matches are found, as ambiguous. One
1048 * strong match with zero or more weak matches
1049 * are acceptable as a unique match.
1050 */
1051 matched_weak = refs;
1052 weak_match++;
1053 }
1054 else {
1055 matched = refs;
1056 match++;
1057 }
1058 }
1059 if (!matched) {
1060 if (matched_ref)
1061 *matched_ref = matched_weak;
1062 return weak_match;
1063 }
1064 else {
1065 if (matched_ref)
1066 *matched_ref = matched;
1067 return match;
1068 }
1069}
1070static void tail_link_ref(struct ref *ref, struct ref ***tail)
1072{
1073 **tail = ref;
1074 while (ref->next)
1075 ref = ref->next;
1076 *tail = &ref->next;
1077}
1078static struct ref *alloc_delete_ref(void)
1080{
1081 struct ref *ref = alloc_ref("(delete)");
1082 hashclr(ref->new_sha1);
1083 return ref;
1084}
1085static int try_explicit_object_name(const char *name,
1087 struct ref **match)
1088{
1089 unsigned char sha1[20];
1090 if (!*name) {
1092 if (match)
1093 *match = alloc_delete_ref();
1094 return 0;
1095 }
1096 if (get_sha1(name, sha1))
1098 return -1;
1099 if (match) {
1101 *match = alloc_ref(name);
1102 hashcpy((*match)->new_sha1, sha1);
1103 }
1104 return 0;
1105}
1106static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1108{
1109 struct ref *ret = alloc_ref(name);
1110 tail_link_ref(ret, tail);
1111 return ret;
1112}
1113static char *guess_ref(const char *name, struct ref *peer)
1115{
1116 struct strbuf buf = STRBUF_INIT;
1117 unsigned char sha1[20];
1118 const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1120 if (!r)
1121 return NULL;
1122 if (starts_with(r, "refs/heads/"))
1124 strbuf_addstr(&buf, "refs/heads/");
1125 else if (starts_with(r, "refs/tags/"))
1126 strbuf_addstr(&buf, "refs/tags/");
1127 else
1128 return NULL;
1129 strbuf_addstr(&buf, name);
1131 return strbuf_detach(&buf, NULL);
1132}
1133static int match_explicit_lhs(struct ref *src,
1135 struct refspec *rs,
1136 struct ref **match,
1137 int *allocated_match)
1138{
1139 switch (count_refspec_match(rs->src, src, match)) {
1140 case 1:
1141 if (allocated_match)
1142 *allocated_match = 0;
1143 return 0;
1144 case 0:
1145 /* The source could be in the get_sha1() format
1146 * not a reference name. :refs/other is a
1147 * way to delete 'other' ref at the remote end.
1148 */
1149 if (try_explicit_object_name(rs->src, match) < 0)
1150 return error("src refspec %s does not match any.", rs->src);
1151 if (allocated_match)
1152 *allocated_match = 1;
1153 return 0;
1154 default:
1155 return error("src refspec %s matches more than one.", rs->src);
1156 }
1157}
1158static int match_explicit(struct ref *src, struct ref *dst,
1160 struct ref ***dst_tail,
1161 struct refspec *rs)
1162{
1163 struct ref *matched_src, *matched_dst;
1164 int allocated_src;
1165 const char *dst_value = rs->dst;
1167 char *dst_guess;
1168 if (rs->pattern || rs->matching)
1170 return 0;
1171 matched_src = matched_dst = NULL;
1173 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1174 return -1;
1175 if (!dst_value) {
1177 unsigned char sha1[20];
1178 int flag;
1179 dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1181 if (!dst_value ||
1182 ((flag & REF_ISSYMREF) &&
1183 !starts_with(dst_value, "refs/heads/")))
1184 die("%s cannot be resolved to branch.",
1185 matched_src->name);
1186 }
1187 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1189 case 1:
1190 break;
1191 case 0:
1192 if (starts_with(dst_value, "refs/"))
1193 matched_dst = make_linked_ref(dst_value, dst_tail);
1194 else if (is_null_sha1(matched_src->new_sha1))
1195 error("unable to delete '%s': remote ref does not exist",
1196 dst_value);
1197 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1198 matched_dst = make_linked_ref(dst_guess, dst_tail);
1199 else
1200 error("unable to push to unqualified destination: %s\n"
1201 "The destination refspec neither matches an "
1202 "existing ref on the remote nor\n"
1203 "begins with refs/, and we are unable to "
1204 "guess a prefix based on the source ref.",
1205 dst_value);
1206 break;
1207 default:
1208 matched_dst = NULL;
1209 error("dst refspec %s matches more than one.",
1210 dst_value);
1211 break;
1212 }
1213 if (!matched_dst)
1214 return -1;
1215 if (matched_dst->peer_ref)
1216 return error("dst ref %s receives from more than one src.",
1217 matched_dst->name);
1218 else {
1219 matched_dst->peer_ref = allocated_src ?
1220 matched_src :
1221 copy_ref(matched_src);
1222 matched_dst->force = rs->force;
1223 }
1224 return 0;
1225}
1226static int match_explicit_refs(struct ref *src, struct ref *dst,
1228 struct ref ***dst_tail, struct refspec *rs,
1229 int rs_nr)
1230{
1231 int i, errs;
1232 for (i = errs = 0; i < rs_nr; i++)
1233 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1234 return errs;
1235}
1236static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1238 int send_mirror, int direction, const struct refspec **ret_pat)
1239{
1240 const struct refspec *pat;
1241 char *name;
1242 int i;
1243 int matching_refs = -1;
1244 for (i = 0; i < rs_nr; i++) {
1245 if (rs[i].matching &&
1246 (matching_refs == -1 || rs[i].force)) {
1247 matching_refs = i;
1248 continue;
1249 }
1250 if (rs[i].pattern) {
1252 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1253 int match;
1254 if (direction == FROM_SRC)
1255 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1256 else
1257 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1258 if (match) {
1259 matching_refs = i;
1260 break;
1261 }
1262 }
1263 }
1264 if (matching_refs == -1)
1265 return NULL;
1266 pat = rs + matching_refs;
1268 if (pat->matching) {
1269 /*
1270 * "matching refs"; traditionally we pushed everything
1271 * including refs outside refs/heads/ hierarchy, but
1272 * that does not make much sense these days.
1273 */
1274 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1275 return NULL;
1276 name = xstrdup(ref->name);
1277 }
1278 if (ret_pat)
1279 *ret_pat = pat;
1280 return name;
1281}
1282static struct ref **tail_ref(struct ref **head)
1284{
1285 struct ref **tail = head;
1286 while (*tail)
1287 tail = &((*tail)->next);
1288 return tail;
1289}
1290struct tips {
1292 struct commit **tip;
1293 int nr, alloc;
1294};
1295static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1297{
1298 struct commit *commit;
1299 if (is_null_sha1(sha1))
1301 return;
1302 commit = lookup_commit_reference_gently(sha1, 1);
1303 if (!commit || (commit->object.flags & TMP_MARK))
1304 return;
1305 commit->object.flags |= TMP_MARK;
1306 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1307 tips->tip[tips->nr++] = commit;
1308}
1309static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1311{
1312 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1313 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1314 struct string_list_item *item;
1315 struct ref *ref;
1316 struct tips sent_tips;
1317 /*
1319 * Collect everything we know they would have at the end of
1320 * this push, and collect all tags they have.
1321 */
1322 memset(&sent_tips, 0, sizeof(sent_tips));
1323 for (ref = *dst; ref; ref = ref->next) {
1324 if (ref->peer_ref &&
1325 !is_null_sha1(ref->peer_ref->new_sha1))
1326 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1327 else
1328 add_to_tips(&sent_tips, ref->old_sha1);
1329 if (starts_with(ref->name, "refs/tags/"))
1330 string_list_append(&dst_tag, ref->name);
1331 }
1332 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1333 sort_string_list(&dst_tag);
1335 /* Collect tags they do not have. */
1337 for (ref = src; ref; ref = ref->next) {
1338 if (!starts_with(ref->name, "refs/tags/"))
1339 continue; /* not a tag */
1340 if (string_list_has_string(&dst_tag, ref->name))
1341 continue; /* they already have it */
1342 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1343 continue; /* be conservative */
1344 item = string_list_append(&src_tag, ref->name);
1345 item->util = ref;
1346 }
1347 string_list_clear(&dst_tag, 0);
1348 /*
1350 * At this point, src_tag lists tags that are missing from
1351 * dst, and sent_tips lists the tips we are pushing or those
1352 * that we know they already have. An element in the src_tag
1353 * that is an ancestor of any of the sent_tips needs to be
1354 * sent to the other side.
1355 */
1356 if (sent_tips.nr) {
1357 for_each_string_list_item(item, &src_tag) {
1358 struct ref *ref = item->util;
1359 struct ref *dst_ref;
1360 struct commit *commit;
1361 if (is_null_sha1(ref->new_sha1))
1363 continue;
1364 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1365 if (!commit)
1366 /* not pushing a commit, which is not an error */
1367 continue;
1368 /*
1370 * Is this tag, which they do not have, reachable from
1371 * any of the commits we are sending?
1372 */
1373 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1374 continue;
1375 /* Add it in */
1377 dst_ref = make_linked_ref(ref->name, dst_tail);
1378 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1379 dst_ref->peer_ref = copy_ref(ref);
1380 }
1381 }
1382 string_list_clear(&src_tag, 0);
1383 free(sent_tips.tip);
1384}
1385struct ref *find_ref_by_name(const struct ref *list, const char *name)
1387{
1388 for ( ; list; list = list->next)
1389 if (!strcmp(list->name, name))
1390 return (struct ref *)list;
1391 return NULL;
1392}
1393static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1395{
1396 for ( ; ref; ref = ref->next)
1397 string_list_append_nodup(ref_index, ref->name)->util = ref;
1398 sort_string_list(ref_index);
1400}
1401/*
1403 * Given only the set of local refs, sanity-check the set of push
1404 * refspecs. We can't catch all errors that match_push_refs would,
1405 * but we can catch some errors early before even talking to the
1406 * remote side.
1407 */
1408int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1409{
1410 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1411 int ret = 0;
1412 int i;
1413 for (i = 0; i < nr_refspec; i++) {
1415 struct refspec *rs = refspec + i;
1416 if (rs->pattern || rs->matching)
1418 continue;
1419 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1421 }
1422 free_refspec(nr_refspec, refspec);
1424 return ret;
1425}
1426/*
1428 * Given the set of refs the local repository has, the set of refs the
1429 * remote repository has, and the refspec used for push, determine
1430 * what remote refs we will update and with what value by setting
1431 * peer_ref (which object is being pushed) and force (if the push is
1432 * forced) in elements of "dst". The function may add new elements to
1433 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1434 */
1435int match_push_refs(struct ref *src, struct ref **dst,
1436 int nr_refspec, const char **refspec, int flags)
1437{
1438 struct refspec *rs;
1439 int send_all = flags & MATCH_REFS_ALL;
1440 int send_mirror = flags & MATCH_REFS_MIRROR;
1441 int send_prune = flags & MATCH_REFS_PRUNE;
1442 int errs;
1443 static const char *default_refspec[] = { ":", NULL };
1444 struct ref *ref, **dst_tail = tail_ref(dst);
1445 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1446 if (!nr_refspec) {
1448 nr_refspec = 1;
1449 refspec = default_refspec;
1450 }
1451 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1452 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1453 /* pick the remainder */
1455 for (ref = src; ref; ref = ref->next) {
1456 struct string_list_item *dst_item;
1457 struct ref *dst_peer;
1458 const struct refspec *pat = NULL;
1459 char *dst_name;
1460 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1462 if (!dst_name)
1463 continue;
1464 if (!dst_ref_index.nr)
1466 prepare_ref_index(&dst_ref_index, *dst);
1467 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1469 dst_peer = dst_item ? dst_item->util : NULL;
1470 if (dst_peer) {
1471 if (dst_peer->peer_ref)
1472 /* We're already sending something to this ref. */
1473 goto free_name;
1474 } else {
1475 if (pat->matching && !(send_all || send_mirror))
1476 /*
1477 * Remote doesn't have it, and we have no
1478 * explicit pattern, and we don't have
1479 * --all or --mirror.
1480 */
1481 goto free_name;
1482 /* Create a new one and link it */
1484 dst_peer = make_linked_ref(dst_name, &dst_tail);
1485 hashcpy(dst_peer->new_sha1, ref->new_sha1);
1486 string_list_insert(&dst_ref_index,
1487 dst_peer->name)->util = dst_peer;
1488 }
1489 dst_peer->peer_ref = copy_ref(ref);
1490 dst_peer->force = pat->force;
1491 free_name:
1492 free(dst_name);
1493 }
1494 string_list_clear(&dst_ref_index, 0);
1496 if (flags & MATCH_REFS_FOLLOW_TAGS)
1498 add_missing_tags(src, dst, &dst_tail);
1499 if (send_prune) {
1501 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1502 /* check for missing refs on the remote */
1503 for (ref = *dst; ref; ref = ref->next) {
1504 char *src_name;
1505 if (ref->peer_ref)
1507 /* We're already sending something to this ref. */
1508 continue;
1509 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1511 if (src_name) {
1512 if (!src_ref_index.nr)
1513 prepare_ref_index(&src_ref_index, src);
1514 if (!string_list_has_string(&src_ref_index,
1515 src_name))
1516 ref->peer_ref = alloc_delete_ref();
1517 free(src_name);
1518 }
1519 }
1520 string_list_clear(&src_ref_index, 0);
1521 }
1522 if (errs)
1523 return -1;
1524 return 0;
1525}
1526void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1528 int force_update)
1529{
1530 struct ref *ref;
1531 for (ref = remote_refs; ref; ref = ref->next) {
1533 int force_ref_update = ref->force || force_update;
1534 int reject_reason = 0;
1535 if (ref->peer_ref)
1537 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1538 else if (!send_mirror)
1539 continue;
1540 ref->deletion = is_null_sha1(ref->new_sha1);
1542 if (!ref->deletion &&
1543 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1544 ref->status = REF_STATUS_UPTODATE;
1545 continue;
1546 }
1547 /*
1549 * Bypass the usual "must fast-forward" check but
1550 * replace it with a weaker "the old value must be
1551 * this value we observed". If the remote ref has
1552 * moved and is now different from what we expect,
1553 * reject any push.
1554 *
1555 * It also is an error if the user told us to check
1556 * with the remote-tracking branch to find the value
1557 * to expect, but we did not have such a tracking
1558 * branch.
1559 */
1560 if (ref->expect_old_sha1) {
1561 if (ref->expect_old_no_trackback ||
1562 hashcmp(ref->old_sha1, ref->old_sha1_expect))
1563 reject_reason = REF_STATUS_REJECT_STALE;
1564 }
1565 /*
1567 * The usual "must fast-forward" rules.
1568 *
1569 * Decide whether an individual refspec A:B can be
1570 * pushed. The push will succeed if any of the
1571 * following are true:
1572 *
1573 * (1) the remote reference B does not exist
1574 *
1575 * (2) the remote reference B is being removed (i.e.,
1576 * pushing :B where no source is specified)
1577 *
1578 * (3) the destination is not under refs/tags/, and
1579 * if the old and new value is a commit, the new
1580 * is a descendant of the old.
1581 *
1582 * (4) it is forced using the +A:B notation, or by
1583 * passing the --force argument
1584 */
1585 else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1587 if (starts_with(ref->name, "refs/tags/"))
1588 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1589 else if (!has_sha1_file(ref->old_sha1))
1590 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1591 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1592 !lookup_commit_reference_gently(ref->new_sha1, 1))
1593 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1594 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1595 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1596 }
1597 /*
1599 * "--force" will defeat any rejection implemented
1600 * by the rules above.
1601 */
1602 if (!force_ref_update)
1603 ref->status = reject_reason;
1604 else if (reject_reason)
1605 ref->forced_update = 1;
1606 }
1607}
1608struct branch *branch_get(const char *name)
1610{
1611 struct branch *ret;
1612 read_config();
1614 if (!name || !*name || !strcmp(name, "HEAD"))
1615 ret = current_branch;
1616 else
1617 ret = make_branch(name, 0);
1618 if (ret && ret->remote_name) {
1619 ret->remote = remote_get(ret->remote_name);
1620 if (ret->merge_nr) {
1621 int i;
1622 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1623 for (i = 0; i < ret->merge_nr; i++) {
1624 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1625 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1626 if (remote_find_tracking(ret->remote, ret->merge[i])
1627 && !strcmp(ret->remote_name, "."))
1628 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1629 }
1630 }
1631 }
1632 return ret;
1633}
1634int branch_has_merge_config(struct branch *branch)
1636{
1637 return branch && !!branch->merge;
1638}
1639int branch_merge_matches(struct branch *branch,
1641 int i,
1642 const char *refname)
1643{
1644 if (!branch || i < 0 || i >= branch->merge_nr)
1645 return 0;
1646 return refname_match(branch->merge[i]->src, refname);
1647}
1648static int ignore_symref_update(const char *refname)
1650{
1651 unsigned char sha1[20];
1652 int flag;
1653 if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1655 return 0; /* non-existing refs are OK */
1656 return (flag & REF_ISSYMREF);
1657}
1658/*
1660 * Create and return a list of (struct ref) consisting of copies of
1661 * each remote_ref that matches refspec. refspec must be a pattern.
1662 * Fill in the copies' peer_ref to describe the local tracking refs to
1663 * which they map. Omit any references that would map to an existing
1664 * local symbolic ref.
1665 */
1666static struct ref *get_expanded_map(const struct ref *remote_refs,
1667 const struct refspec *refspec)
1668{
1669 const struct ref *ref;
1670 struct ref *ret = NULL;
1671 struct ref **tail = &ret;
1672 for (ref = remote_refs; ref; ref = ref->next) {
1674 char *expn_name = NULL;
1675 if (strchr(ref->name, '^'))
1677 continue; /* a dereference item */
1678 if (match_name_with_pattern(refspec->src, ref->name,
1679 refspec->dst, &expn_name) &&
1680 !ignore_symref_update(expn_name)) {
1681 struct ref *cpy = copy_ref(ref);
1682 cpy->peer_ref = alloc_ref(expn_name);
1684 if (refspec->force)
1685 cpy->peer_ref->force = 1;
1686 *tail = cpy;
1687 tail = &cpy->next;
1688 }
1689 free(expn_name);
1690 }
1691 return ret;
1693}
1694static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1696{
1697 const struct ref *ref;
1698 for (ref = refs; ref; ref = ref->next) {
1699 if (refname_match(name, ref->name))
1700 return ref;
1701 }
1702 return NULL;
1703}
1704struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1706{
1707 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1708 if (!ref)
1710 return NULL;
1711 return copy_ref(ref);
1713}
1714static struct ref *get_local_ref(const char *name)
1716{
1717 if (!name || name[0] == '\0')
1718 return NULL;
1719 if (starts_with(name, "refs/"))
1721 return alloc_ref(name);
1722 if (starts_with(name, "heads/") ||
1724 starts_with(name, "tags/") ||
1725 starts_with(name, "remotes/"))
1726 return alloc_ref_with_prefix("refs/", 5, name);
1727 return alloc_ref_with_prefix("refs/heads/", 11, name);
1729}
1730int get_fetch_map(const struct ref *remote_refs,
1732 const struct refspec *refspec,
1733 struct ref ***tail,
1734 int missing_ok)
1735{
1736 struct ref *ref_map, **rmp;
1737 if (refspec->pattern) {
1739 ref_map = get_expanded_map(remote_refs, refspec);
1740 } else {
1741 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1742 if (refspec->exact_sha1) {
1744 ref_map = alloc_ref(name);
1745 get_sha1_hex(name, ref_map->old_sha1);
1746 } else {
1747 ref_map = get_remote_ref(remote_refs, name);
1748 }
1749 if (!missing_ok && !ref_map)
1750 die("Couldn't find remote ref %s", name);
1751 if (ref_map) {
1752 ref_map->peer_ref = get_local_ref(refspec->dst);
1753 if (ref_map->peer_ref && refspec->force)
1754 ref_map->peer_ref->force = 1;
1755 }
1756 }
1757 for (rmp = &ref_map; *rmp; ) {
1759 if ((*rmp)->peer_ref) {
1760 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1761 check_refname_format((*rmp)->peer_ref->name, 0)) {
1762 struct ref *ignore = *rmp;
1763 error("* Ignoring funny ref '%s' locally",
1764 (*rmp)->peer_ref->name);
1765 *rmp = (*rmp)->next;
1766 free(ignore->peer_ref);
1767 free(ignore);
1768 continue;
1769 }
1770 }
1771 rmp = &((*rmp)->next);
1772 }
1773 if (ref_map)
1775 tail_link_ref(ref_map, tail);
1776 return 0;
1778}
1779int resolve_remote_symref(struct ref *ref, struct ref *list)
1781{
1782 if (!ref->symref)
1783 return 0;
1784 for (; list; list = list->next)
1785 if (!strcmp(ref->symref, list->name)) {
1786 hashcpy(ref->old_sha1, list->old_sha1);
1787 return 0;
1788 }
1789 return 1;
1790}
1791static void unmark_and_free(struct commit_list *list, unsigned int mark)
1793{
1794 while (list) {
1795 struct commit_list *temp = list;
1796 temp->item->object.flags &= ~mark;
1797 list = temp->next;
1798 free(temp);
1799 }
1800}
1801int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1803{
1804 struct object *o;
1805 struct commit *old, *new;
1806 struct commit_list *list, *used;
1807 int found = 0;
1808 /*
1810 * Both new and old must be commit-ish and new is descendant of
1811 * old. Otherwise we require --force.
1812 */
1813 o = deref_tag(parse_object(old_sha1), NULL, 0);
1814 if (!o || o->type != OBJ_COMMIT)
1815 return 0;
1816 old = (struct commit *) o;
1817 o = deref_tag(parse_object(new_sha1), NULL, 0);
1819 if (!o || o->type != OBJ_COMMIT)
1820 return 0;
1821 new = (struct commit *) o;
1822 if (parse_commit(new) < 0)
1824 return 0;
1825 used = list = NULL;
1827 commit_list_insert(new, &list);
1828 while (list) {
1829 new = pop_most_recent_commit(&list, TMP_MARK);
1830 commit_list_insert(new, &used);
1831 if (new == old) {
1832 found = 1;
1833 break;
1834 }
1835 }
1836 unmark_and_free(list, TMP_MARK);
1837 unmark_and_free(used, TMP_MARK);
1838 return found;
1839}
1840/*
1842 * Compare a branch with its upstream, and save their differences (number
1843 * of commits) in *num_ours and *num_theirs.
1844 *
1845 * Return 0 if branch has no upstream (no base), -1 if upstream is missing
1846 * (with "gone" base), otherwise 1 (with base).
1847 */
1848int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1849{
1850 unsigned char sha1[20];
1851 struct commit *ours, *theirs;
1852 char symmetric[84];
1853 struct rev_info revs;
1854 const char *rev_argv[10], *base;
1855 int rev_argc;
1856 /* Cannot stat unless we are marked to build on top of somebody else. */
1858 if (!branch ||
1859 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1860 return 0;
1861 /* Cannot stat if what we used to build on no longer exists */
1863 base = branch->merge[0]->dst;
1864 if (read_ref(base, sha1))
1865 return -1;
1866 theirs = lookup_commit_reference(sha1);
1867 if (!theirs)
1868 return -1;
1869 if (read_ref(branch->refname, sha1))
1871 return -1;
1872 ours = lookup_commit_reference(sha1);
1873 if (!ours)
1874 return -1;
1875 /* are we the same? */
1877 if (theirs == ours) {
1878 *num_theirs = *num_ours = 0;
1879 return 1;
1880 }
1881 /* Run "rev-list --left-right ours...theirs" internally... */
1883 rev_argc = 0;
1884 rev_argv[rev_argc++] = NULL;
1885 rev_argv[rev_argc++] = "--left-right";
1886 rev_argv[rev_argc++] = symmetric;
1887 rev_argv[rev_argc++] = "--";
1888 rev_argv[rev_argc] = NULL;
1889 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1891 strcpy(symmetric + 40, "...");
1892 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1893 init_revisions(&revs, NULL);
1895 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1896 prepare_revision_walk(&revs);
1897 /* ... and count the commits on each side. */
1899 *num_ours = 0;
1900 *num_theirs = 0;
1901 while (1) {
1902 struct commit *c = get_revision(&revs);
1903 if (!c)
1904 break;
1905 if (c->object.flags & SYMMETRIC_LEFT)
1906 (*num_ours)++;
1907 else
1908 (*num_theirs)++;
1909 }
1910 /* clear object flags smudged by the above traversal */
1912 clear_commit_marks(ours, ALL_REV_FLAGS);
1913 clear_commit_marks(theirs, ALL_REV_FLAGS);
1914 return 1;
1915}
1916/*
1918 * Return true when there is anything to report, otherwise false.
1919 */
1920int format_tracking_info(struct branch *branch, struct strbuf *sb)
1921{
1922 int ours, theirs;
1923 const char *base;
1924 int upstream_is_gone = 0;
1925 switch (stat_tracking_info(branch, &ours, &theirs)) {
1927 case 0:
1928 /* no base */
1929 return 0;
1930 case -1:
1931 /* with "gone" base */
1932 upstream_is_gone = 1;
1933 break;
1934 default:
1935 /* with base */
1936 break;
1937 }
1938 base = branch->merge[0]->dst;
1940 base = shorten_unambiguous_ref(base, 0);
1941 if (upstream_is_gone) {
1942 strbuf_addf(sb,
1943 _("Your branch is based on '%s', but the upstream is gone.\n"),
1944 base);
1945 if (advice_status_hints)
1946 strbuf_addf(sb,
1947 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
1948 } else if (!ours && !theirs) {
1949 strbuf_addf(sb,
1950 _("Your branch is up-to-date with '%s'.\n"),
1951 base);
1952 } else if (!theirs) {
1953 strbuf_addf(sb,
1954 Q_("Your branch is ahead of '%s' by %d commit.\n",
1955 "Your branch is ahead of '%s' by %d commits.\n",
1956 ours),
1957 base, ours);
1958 if (advice_status_hints)
1959 strbuf_addf(sb,
1960 _(" (use \"git push\" to publish your local commits)\n"));
1961 } else if (!ours) {
1962 strbuf_addf(sb,
1963 Q_("Your branch is behind '%s' by %d commit, "
1964 "and can be fast-forwarded.\n",
1965 "Your branch is behind '%s' by %d commits, "
1966 "and can be fast-forwarded.\n",
1967 theirs),
1968 base, theirs);
1969 if (advice_status_hints)
1970 strbuf_addf(sb,
1971 _(" (use \"git pull\" to update your local branch)\n"));
1972 } else {
1973 strbuf_addf(sb,
1974 Q_("Your branch and '%s' have diverged,\n"
1975 "and have %d and %d different commit each, "
1976 "respectively.\n",
1977 "Your branch and '%s' have diverged,\n"
1978 "and have %d and %d different commits each, "
1979 "respectively.\n",
1980 theirs),
1981 base, ours, theirs);
1982 if (advice_status_hints)
1983 strbuf_addf(sb,
1984 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
1985 }
1986 return 1;
1987}
1988static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1990{
1991 struct ref ***local_tail = cb_data;
1992 struct ref *ref;
1993 int len;
1994 /* we already know it starts with refs/ to get here */
1996 if (check_refname_format(refname + 5, 0))
1997 return 0;
1998 len = strlen(refname) + 1;
2000 ref = xcalloc(1, sizeof(*ref) + len);
2001 hashcpy(ref->new_sha1, sha1);
2002 memcpy(ref->name, refname, len);
2003 **local_tail = ref;
2004 *local_tail = &ref->next;
2005 return 0;
2006}
2007struct ref *get_local_heads(void)
2009{
2010 struct ref *local_refs = NULL, **local_tail = &local_refs;
2011 for_each_ref(one_local_ref, &local_tail);
2012 return local_refs;
2013}
2014struct ref *guess_remote_head(const struct ref *head,
2016 const struct ref *refs,
2017 int all)
2018{
2019 const struct ref *r;
2020 struct ref *list = NULL;
2021 struct ref **tail = &list;
2022 if (!head)
2024 return NULL;
2025 /*
2027 * Some transports support directly peeking at
2028 * where HEAD points; if that is the case, then
2029 * we don't have to guess.
2030 */
2031 if (head->symref)
2032 return copy_ref(find_ref_by_name(refs, head->symref));
2033 /* If refs/heads/master could be right, it is. */
2035 if (!all) {
2036 r = find_ref_by_name(refs, "refs/heads/master");
2037 if (r && !hashcmp(r->old_sha1, head->old_sha1))
2038 return copy_ref(r);
2039 }
2040 /* Look for another ref that points there */
2042 for (r = refs; r; r = r->next) {
2043 if (r != head &&
2044 starts_with(r->name, "refs/heads/") &&
2045 !hashcmp(r->old_sha1, head->old_sha1)) {
2046 *tail = copy_ref(r);
2047 tail = &((*tail)->next);
2048 if (!all)
2049 break;
2050 }
2051 }
2052 return list;
2054}
2055struct stale_heads_info {
2057 struct string_list *ref_names;
2058 struct ref **stale_refs_tail;
2059 struct refspec *refs;
2060 int ref_count;
2061};
2062static int get_stale_heads_cb(const char *refname,
2064 const unsigned char *sha1, int flags, void *cb_data)
2065{
2066 struct stale_heads_info *info = cb_data;
2067 struct string_list matches = STRING_LIST_INIT_DUP;
2068 struct refspec query;
2069 int i, stale = 1;
2070 memset(&query, 0, sizeof(struct refspec));
2071 query.dst = (char *)refname;
2072 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2074 if (matches.nr == 0)
2075 goto clean_exit; /* No matches */
2076 /*
2078 * If we did find a suitable refspec and it's not a symref and
2079 * it's not in the list of refs that currently exist in that
2080 * remote, we consider it to be stale. In order to deal with
2081 * overlapping refspecs, we need to go over all of the
2082 * matching refs.
2083 */
2084 if (flags & REF_ISSYMREF)
2085 goto clean_exit;
2086 for (i = 0; stale && i < matches.nr; i++)
2088 if (string_list_has_string(info->ref_names, matches.items[i].string))
2089 stale = 0;
2090 if (stale) {
2092 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2093 hashcpy(ref->new_sha1, sha1);
2094 }
2095clean_exit:
2097 string_list_clear(&matches, 0);
2098 return 0;
2099}
2100struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2102{
2103 struct ref *ref, *stale_refs = NULL;
2104 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2105 struct stale_heads_info info;
2106 info.ref_names = &ref_names;
2107 info.stale_refs_tail = &stale_refs;
2108 info.refs = refs;
2109 info.ref_count = ref_count;
2110 for (ref = fetch_map; ref; ref = ref->next)
2111 string_list_append(&ref_names, ref->name);
2112 sort_string_list(&ref_names);
2113 for_each_ref(get_stale_heads_cb, &info);
2114 string_list_clear(&ref_names, 0);
2115 return stale_refs;
2116}
2117/*
2119 * Compare-and-swap
2120 */
2121void clear_cas_option(struct push_cas_option *cas)
2122{
2123 int i;
2124 for (i = 0; i < cas->nr; i++)
2126 free(cas->entry[i].refname);
2127 free(cas->entry);
2128 memset(cas, 0, sizeof(*cas));
2129}
2130static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2132 const char *refname,
2133 size_t refnamelen)
2134{
2135 struct push_cas *entry;
2136 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2137 entry = &cas->entry[cas->nr++];
2138 memset(entry, 0, sizeof(*entry));
2139 entry->refname = xmemdupz(refname, refnamelen);
2140 return entry;
2141}
2142int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2144{
2145 const char *colon;
2146 struct push_cas *entry;
2147 if (unset) {
2149 /* "--no-<option>" */
2150 clear_cas_option(cas);
2151 return 0;
2152 }
2153 if (!arg) {
2155 /* just "--<option>" */
2156 cas->use_tracking_for_rest = 1;
2157 return 0;
2158 }
2159 /* "--<option>=refname" or "--<option>=refname:value" */
2161 colon = strchrnul(arg, ':');
2162 entry = add_cas_entry(cas, arg, colon - arg);
2163 if (!*colon)
2164 entry->use_tracking = 1;
2165 else if (get_sha1(colon + 1, entry->expect))
2166 return error("cannot parse expected object name '%s'", colon + 1);
2167 return 0;
2168}
2169int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2171{
2172 return parse_push_cas_option(opt->value, arg, unset);
2173}
2174int is_empty_cas(const struct push_cas_option *cas)
2176{
2177 return !cas->use_tracking_for_rest && !cas->nr;
2178}
2179/*
2181 * Look at remote.fetch refspec and see if we have a remote
2182 * tracking branch for the refname there. Fill its current
2183 * value in sha1[].
2184 * If we cannot do so, return negative to signal an error.
2185 */
2186static int remote_tracking(struct remote *remote, const char *refname,
2187 unsigned char sha1[20])
2188{
2189 char *dst;
2190 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2192 if (!dst)
2193 return -1; /* no tracking ref for refname at remote */
2194 if (read_ref(dst, sha1))
2195 return -1; /* we know what the tracking ref is but we cannot read it */
2196 return 0;
2197}
2198static void apply_cas(struct push_cas_option *cas,
2200 struct remote *remote,
2201 struct ref *ref)
2202{
2203 int i;
2204 /* Find an explicit --<option>=<name>[:<value>] entry */
2206 for (i = 0; i < cas->nr; i++) {
2207 struct push_cas *entry = &cas->entry[i];
2208 if (!refname_match(entry->refname, ref->name))
2209 continue;
2210 ref->expect_old_sha1 = 1;
2211 if (!entry->use_tracking)
2212 hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
2213 else if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2214 ref->expect_old_no_trackback = 1;
2215 return;
2216 }
2217 /* Are we using "--<option>" to cover all? */
2219 if (!cas->use_tracking_for_rest)
2220 return;
2221 ref->expect_old_sha1 = 1;
2223 if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2224 ref->expect_old_no_trackback = 1;
2225}
2226void apply_push_cas(struct push_cas_option *cas,
2228 struct remote *remote,
2229 struct ref *remote_refs)
2230{
2231 struct ref *ref;
2232 for (ref = remote_refs; ref; ref = ref->next)
2233 apply_cas(cas, remote, ref);
2234}