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 char *refname;
174 for (i = 0; i < branches_nr; i++) {
176 if (len ? (!strncmp(name, branches[i]->name, len) &&
177 !branches[i]->name[len]) :
178 !strcmp(name, branches[i]->name))
179 return branches[i];
180 }
181 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
183 ret = xcalloc(1, sizeof(struct branch));
184 branches[branches_nr++] = ret;
185 if (len)
186 ret->name = xstrndup(name, len);
187 else
188 ret->name = xstrdup(name);
189 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
190 strcpy(refname, "refs/heads/");
191 strcpy(refname + strlen("refs/heads/"), ret->name);
192 ret->refname = refname;
193 return ret;
195}
196static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
198{
199 struct rewrite *ret;
200 int i;
201 for (i = 0; i < r->rewrite_nr; i++) {
203 if (len
204 ? (len == r->rewrite[i]->baselen &&
205 !strncmp(base, r->rewrite[i]->base, len))
206 : !strcmp(base, r->rewrite[i]->base))
207 return r->rewrite[i];
208 }
209 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
211 ret = xcalloc(1, sizeof(struct rewrite));
212 r->rewrite[r->rewrite_nr++] = ret;
213 if (len) {
214 ret->base = xstrndup(base, len);
215 ret->baselen = len;
216 }
217 else {
218 ret->base = xstrdup(base);
219 ret->baselen = strlen(base);
220 }
221 return ret;
222}
223static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
225{
226 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
227 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
228 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
229 rewrite->instead_of_nr++;
230}
231static void read_remotes_file(struct remote *remote)
233{
234 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
235 if (!f)
237 return;
238 remote->origin = REMOTE_REMOTES;
239 while (fgets(buffer, BUF_SIZE, f)) {
240 int value_list;
241 char *s, *p;
242 if (starts_with(buffer, "URL:")) {
244 value_list = 0;
245 s = buffer + 4;
246 } else if (starts_with(buffer, "Push:")) {
247 value_list = 1;
248 s = buffer + 5;
249 } else if (starts_with(buffer, "Pull:")) {
250 value_list = 2;
251 s = buffer + 5;
252 } else
253 continue;
254 while (isspace(*s))
256 s++;
257 if (!*s)
258 continue;
259 p = s + strlen(s);
261 while (isspace(p[-1]))
262 *--p = 0;
263 switch (value_list) {
265 case 0:
266 add_url_alias(remote, xstrdup(s));
267 break;
268 case 1:
269 add_push_refspec(remote, xstrdup(s));
270 break;
271 case 2:
272 add_fetch_refspec(remote, xstrdup(s));
273 break;
274 }
275 }
276 fclose(f);
277}
278static void read_branches_file(struct remote *remote)
280{
281 char *frag;
282 struct strbuf branch = STRBUF_INIT;
283 int n = 1000;
284 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
285 char *s, *p;
286 int len;
287 if (!f)
289 return;
290 s = fgets(buffer, BUF_SIZE, f);
291 fclose(f);
292 if (!s)
293 return;
294 while (isspace(*s))
295 s++;
296 if (!*s)
297 return;
298 remote->origin = REMOTE_BRANCHES;
299 p = s + strlen(s);
300 while (isspace(p[-1]))
301 *--p = 0;
302 len = p - s;
303 p = xmalloc(len + 1);
304 strcpy(p, s);
305 /*
307 * The branches file would have URL and optionally
308 * #branch specified. The "master" (or specified) branch is
309 * fetched and stored in the local branch of the same name.
310 */
311 frag = strchr(p, '#');
312 if (frag) {
313 *(frag++) = '\0';
314 strbuf_addf(&branch, "refs/heads/%s", frag);
315 } else
316 strbuf_addstr(&branch, "refs/heads/master");
317 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
319 add_url_alias(remote, p);
320 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
321 /*
322 * Cogito compatible push: push current HEAD to remote #branch
323 * (master if missing)
324 */
325 strbuf_init(&branch, 0);
326 strbuf_addstr(&branch, "HEAD");
327 if (frag)
328 strbuf_addf(&branch, ":refs/heads/%s", frag);
329 else
330 strbuf_addstr(&branch, ":refs/heads/master");
331 add_push_refspec(remote, strbuf_detach(&branch, NULL));
332 remote->fetch_tags = 1; /* always auto-follow */
333}
334static int handle_config(const char *key, const char *value, void *cb)
336{
337 const char *name;
338 const char *subkey;
339 struct remote *remote;
340 struct branch *branch;
341 if (starts_with(key, "branch.")) {
342 name = key + 7;
343 subkey = strrchr(name, '.');
344 if (!subkey)
345 return 0;
346 branch = make_branch(name, subkey - name);
347 if (!strcmp(subkey, ".remote")) {
348 if (git_config_string(&branch->remote_name, key, value))
349 return -1;
350 if (branch == current_branch) {
351 default_remote_name = branch->remote_name;
352 explicit_default_remote_name = 1;
353 }
354 } else if (!strcmp(subkey, ".pushremote")) {
355 if (branch == current_branch)
356 if (git_config_string(&branch_pushremote_name, key, value))
357 return -1;
358 } else if (!strcmp(subkey, ".merge")) {
359 if (!value)
360 return config_error_nonbool(key);
361 add_merge(branch, xstrdup(value));
362 }
363 return 0;
364 }
365 if (starts_with(key, "url.")) {
366 struct rewrite *rewrite;
367 name = key + 4;
368 subkey = strrchr(name, '.');
369 if (!subkey)
370 return 0;
371 if (!strcmp(subkey, ".insteadof")) {
372 rewrite = make_rewrite(&rewrites, name, subkey - name);
373 if (!value)
374 return config_error_nonbool(key);
375 add_instead_of(rewrite, xstrdup(value));
376 } else if (!strcmp(subkey, ".pushinsteadof")) {
377 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
378 if (!value)
379 return config_error_nonbool(key);
380 add_instead_of(rewrite, xstrdup(value));
381 }
382 }
383 if (!starts_with(key, "remote."))
385 return 0;
386 name = key + 7;
387 /* Handle remote.* variables */
389 if (!strcmp(name, "pushdefault"))
390 return git_config_string(&pushremote_name, key, value);
391 /* Handle remote.<name>.* variables */
393 if (*name == '/') {
394 warning("Config remote shorthand cannot begin with '/': %s",
395 name);
396 return 0;
397 }
398 subkey = strrchr(name, '.');
399 if (!subkey)
400 return 0;
401 remote = make_remote(name, subkey - name);
402 remote->origin = REMOTE_CONFIG;
403 if (!strcmp(subkey, ".mirror"))
404 remote->mirror = git_config_bool(key, value);
405 else if (!strcmp(subkey, ".skipdefaultupdate"))
406 remote->skip_default_update = git_config_bool(key, value);
407 else if (!strcmp(subkey, ".skipfetchall"))
408 remote->skip_default_update = git_config_bool(key, value);
409 else if (!strcmp(subkey, ".prune"))
410 remote->prune = git_config_bool(key, value);
411 else if (!strcmp(subkey, ".url")) {
412 const char *v;
413 if (git_config_string(&v, key, value))
414 return -1;
415 add_url(remote, v);
416 } else if (!strcmp(subkey, ".pushurl")) {
417 const char *v;
418 if (git_config_string(&v, key, value))
419 return -1;
420 add_pushurl(remote, v);
421 } else if (!strcmp(subkey, ".push")) {
422 const char *v;
423 if (git_config_string(&v, key, value))
424 return -1;
425 add_push_refspec(remote, v);
426 } else if (!strcmp(subkey, ".fetch")) {
427 const char *v;
428 if (git_config_string(&v, key, value))
429 return -1;
430 add_fetch_refspec(remote, v);
431 } else if (!strcmp(subkey, ".receivepack")) {
432 const char *v;
433 if (git_config_string(&v, key, value))
434 return -1;
435 if (!remote->receivepack)
436 remote->receivepack = v;
437 else
438 error("more than one receivepack given, using the first");
439 } else if (!strcmp(subkey, ".uploadpack")) {
440 const char *v;
441 if (git_config_string(&v, key, value))
442 return -1;
443 if (!remote->uploadpack)
444 remote->uploadpack = v;
445 else
446 error("more than one uploadpack given, using the first");
447 } else if (!strcmp(subkey, ".tagopt")) {
448 if (!strcmp(value, "--no-tags"))
449 remote->fetch_tags = -1;
450 else if (!strcmp(value, "--tags"))
451 remote->fetch_tags = 2;
452 } else if (!strcmp(subkey, ".proxy")) {
453 return git_config_string((const char **)&remote->http_proxy,
454 key, value);
455 } else if (!strcmp(subkey, ".vcs")) {
456 return git_config_string(&remote->foreign_vcs, key, value);
457 }
458 return 0;
459}
460static void alias_all_urls(void)
462{
463 int i, j;
464 for (i = 0; i < remotes_nr; i++) {
465 int add_pushurl_aliases;
466 if (!remotes[i])
467 continue;
468 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
469 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
470 }
471 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
472 for (j = 0; j < remotes[i]->url_nr; j++) {
473 if (add_pushurl_aliases)
474 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
475 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
476 }
477 }
478}
479static void read_config(void)
481{
482 unsigned char sha1[20];
483 const char *head_ref;
484 int flag;
485 if (default_remote_name) /* did this already */
486 return;
487 default_remote_name = "origin";
488 current_branch = NULL;
489 head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
490 if (head_ref && (flag & REF_ISSYMREF) &&
491 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
492 current_branch = make_branch(head_ref, 0);
493 }
494 git_config(handle_config, NULL);
495 if (branch_pushremote_name) {
496 free((char *)pushremote_name);
497 pushremote_name = branch_pushremote_name;
498 }
499 alias_all_urls();
500}
501/*
503 * This function frees a refspec array.
504 * Warning: code paths should be checked to ensure that the src
505 * and dst pointers are always freeable pointers as well
506 * as the refspec pointer itself.
507 */
508static void free_refspecs(struct refspec *refspec, int nr_refspec)
509{
510 int i;
511 if (!refspec)
513 return;
514 for (i = 0; i < nr_refspec; i++) {
516 free(refspec[i].src);
517 free(refspec[i].dst);
518 }
519 free(refspec);
520}
521static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
523{
524 int i;
525 struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
526 for (i = 0; i < nr_refspec; i++) {
528 size_t llen;
529 int is_glob;
530 const char *lhs, *rhs;
531 int flags;
532 is_glob = 0;
534 lhs = refspec[i];
536 if (*lhs == '+') {
537 rs[i].force = 1;
538 lhs++;
539 }
540 rhs = strrchr(lhs, ':');
542 /*
544 * Before going on, special case ":" (or "+:") as a refspec
545 * for pushing matching refs.
546 */
547 if (!fetch && rhs == lhs && rhs[1] == '\0') {
548 rs[i].matching = 1;
549 continue;
550 }
551 if (rhs) {
553 size_t rlen = strlen(++rhs);
554 is_glob = (1 <= rlen && strchr(rhs, '*'));
555 rs[i].dst = xstrndup(rhs, rlen);
556 }
557 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
559 if (1 <= llen && memchr(lhs, '*', llen)) {
560 if ((rhs && !is_glob) || (!rhs && fetch))
561 goto invalid;
562 is_glob = 1;
563 } else if (rhs && is_glob) {
564 goto invalid;
565 }
566 rs[i].pattern = is_glob;
568 rs[i].src = xstrndup(lhs, llen);
569 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
570 if (fetch) {
572 unsigned char unused[40];
573 /* LHS */
575 if (!*rs[i].src)
576 ; /* empty is ok; it means "HEAD" */
577 else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
578 rs[i].exact_sha1 = 1; /* ok */
579 else if (!check_refname_format(rs[i].src, flags))
580 ; /* valid looking ref is ok */
581 else
582 goto invalid;
583 /* RHS */
584 if (!rs[i].dst)
585 ; /* missing is ok; it is the same as empty */
586 else if (!*rs[i].dst)
587 ; /* empty is ok; it means "do not store" */
588 else if (!check_refname_format(rs[i].dst, flags))
589 ; /* valid looking ref is ok */
590 else
591 goto invalid;
592 } else {
593 /*
594 * LHS
595 * - empty is allowed; it means delete.
596 * - when wildcarded, it must be a valid looking ref.
597 * - otherwise, it must be an extended SHA-1, but
598 * there is no existing way to validate this.
599 */
600 if (!*rs[i].src)
601 ; /* empty is ok */
602 else if (is_glob) {
603 if (check_refname_format(rs[i].src, flags))
604 goto invalid;
605 }
606 else
607 ; /* anything goes, for now */
608 /*
609 * RHS
610 * - missing is allowed, but LHS then must be a
611 * valid looking ref.
612 * - empty is not allowed.
613 * - otherwise it must be a valid looking ref.
614 */
615 if (!rs[i].dst) {
616 if (check_refname_format(rs[i].src, flags))
617 goto invalid;
618 } else if (!*rs[i].dst) {
619 goto invalid;
620 } else {
621 if (check_refname_format(rs[i].dst, flags))
622 goto invalid;
623 }
624 }
625 }
626 return rs;
627 invalid:
629 if (verify) {
630 /*
631 * nr_refspec must be greater than zero and i must be valid
632 * since it is only possible to reach this point from within
633 * the for loop above.
634 */
635 free_refspecs(rs, i+1);
636 return NULL;
637 }
638 die("Invalid refspec '%s'", refspec[i]);
639}
640int valid_fetch_refspec(const char *fetch_refspec_str)
642{
643 struct refspec *refspec;
644 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
646 free_refspecs(refspec, 1);
647 return !!refspec;
648}
649struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
651{
652 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
653}
654static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
656{
657 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
658}
659void free_refspec(int nr_refspec, struct refspec *refspec)
661{
662 int i;
663 for (i = 0; i < nr_refspec; i++) {
664 free(refspec[i].src);
665 free(refspec[i].dst);
666 }
667 free(refspec);
668}
669static int valid_remote_nick(const char *name)
671{
672 if (!name[0] || is_dot_or_dotdot(name))
673 return 0;
674 return !strchr(name, '/'); /* no slash */
675}
676static struct remote *remote_get_1(const char *name, const char *pushremote_name)
678{
679 struct remote *ret;
680 int name_given = 0;
681 if (name)
683 name_given = 1;
684 else {
685 if (pushremote_name) {
686 name = pushremote_name;
687 name_given = 1;
688 } else {
689 name = default_remote_name;
690 name_given = explicit_default_remote_name;
691 }
692 }
693 ret = make_remote(name, 0);
695 if (valid_remote_nick(name)) {
696 if (!valid_remote(ret))
697 read_remotes_file(ret);
698 if (!valid_remote(ret))
699 read_branches_file(ret);
700 }
701 if (name_given && !valid_remote(ret))
702 add_url_alias(ret, name);
703 if (!valid_remote(ret))
704 return NULL;
705 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
706 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
707 return ret;
708}
709struct remote *remote_get(const char *name)
711{
712 read_config();
713 return remote_get_1(name, NULL);
714}
715struct remote *pushremote_get(const char *name)
717{
718 read_config();
719 return remote_get_1(name, pushremote_name);
720}
721int remote_is_configured(const char *name)
723{
724 int i;
725 read_config();
726 for (i = 0; i < remotes_nr; i++)
728 if (!strcmp(name, remotes[i]->name))
729 return 1;
730 return 0;
731}
732int for_each_remote(each_remote_fn fn, void *priv)
734{
735 int i, result = 0;
736 read_config();
737 for (i = 0; i < remotes_nr && !result; i++) {
738 struct remote *r = remotes[i];
739 if (!r)
740 continue;
741 if (!r->fetch)
742 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
743 r->fetch_refspec);
744 if (!r->push)
745 r->push = parse_push_refspec(r->push_refspec_nr,
746 r->push_refspec);
747 result = fn(r, priv);
748 }
749 return result;
750}
751static void handle_duplicate(struct ref *ref1, struct ref *ref2)
753{
754 if (strcmp(ref1->name, ref2->name)) {
755 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
756 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
757 die(_("Cannot fetch both %s and %s to %s"),
758 ref1->name, ref2->name, ref2->peer_ref->name);
759 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
760 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
761 warning(_("%s usually tracks %s, not %s"),
762 ref2->peer_ref->name, ref2->name, ref1->name);
763 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
764 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
765 die(_("%s tracks both %s and %s"),
766 ref2->peer_ref->name, ref1->name, ref2->name);
767 } else {
768 /*
769 * This last possibility doesn't occur because
770 * FETCH_HEAD_IGNORE entries always appear at
771 * the end of the list.
772 */
773 die(_("Internal error"));
774 }
775 }
776 free(ref2->peer_ref);
777 free(ref2);
778}
779struct ref *ref_remove_duplicates(struct ref *ref_map)
781{
782 struct string_list refs = STRING_LIST_INIT_NODUP;
783 struct ref *retval = NULL;
784 struct ref **p = &retval;
785 while (ref_map) {
787 struct ref *ref = ref_map;
788 ref_map = ref_map->next;
790 ref->next = NULL;
791 if (!ref->peer_ref) {
793 *p = ref;
794 p = &ref->next;
795 } else {
796 struct string_list_item *item =
797 string_list_insert(&refs, ref->peer_ref->name);
798 if (item->util) {
800 /* Entry already existed */
801 handle_duplicate((struct ref *)item->util, ref);
802 } else {
803 *p = ref;
804 p = &ref->next;
805 item->util = ref;
806 }
807 }
808 }
809 string_list_clear(&refs, 0);
811 return retval;
812}
813int remote_has_url(struct remote *remote, const char *url)
815{
816 int i;
817 for (i = 0; i < remote->url_nr; i++) {
818 if (!strcmp(remote->url[i], url))
819 return 1;
820 }
821 return 0;
822}
823static int match_name_with_pattern(const char *key, const char *name,
825 const char *value, char **result)
826{
827 const char *kstar = strchr(key, '*');
828 size_t klen;
829 size_t ksuffixlen;
830 size_t namelen;
831 int ret;
832 if (!kstar)
833 die("Key '%s' of pattern had no '*'", key);
834 klen = kstar - key;
835 ksuffixlen = strlen(kstar + 1);
836 namelen = strlen(name);
837 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
838 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
839 if (ret && value) {
840 const char *vstar = strchr(value, '*');
841 size_t vlen;
842 size_t vsuffixlen;
843 if (!vstar)
844 die("Value '%s' of pattern has no '*'", value);
845 vlen = vstar - value;
846 vsuffixlen = strlen(vstar + 1);
847 *result = xmalloc(vlen + vsuffixlen +
848 strlen(name) -
849 klen - ksuffixlen + 1);
850 strncpy(*result, value, vlen);
851 strncpy(*result + vlen,
852 name + klen, namelen - klen - ksuffixlen);
853 strcpy(*result + vlen + namelen - klen - ksuffixlen,
854 vstar + 1);
855 }
856 return ret;
857}
858static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
860{
861 int i;
862 int find_src = !query->src;
863 if (find_src && !query->dst)
865 error("query_refspecs_multiple: need either src or dst");
866 for (i = 0; i < ref_count; i++) {
868 struct refspec *refspec = &refs[i];
869 const char *key = find_src ? refspec->dst : refspec->src;
870 const char *value = find_src ? refspec->src : refspec->dst;
871 const char *needle = find_src ? query->dst : query->src;
872 char **result = find_src ? &query->src : &query->dst;
873 if (!refspec->dst)
875 continue;
876 if (refspec->pattern) {
877 if (match_name_with_pattern(key, needle, value, result))
878 string_list_append_nodup(results, *result);
879 } else if (!strcmp(needle, key)) {
880 string_list_append(results, value);
881 }
882 }
883}
884int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
886{
887 int i;
888 int find_src = !query->src;
889 const char *needle = find_src ? query->dst : query->src;
890 char **result = find_src ? &query->src : &query->dst;
891 if (find_src && !query->dst)
893 return error("query_refspecs: need either src or dst");
894 for (i = 0; i < ref_count; i++) {
896 struct refspec *refspec = &refs[i];
897 const char *key = find_src ? refspec->dst : refspec->src;
898 const char *value = find_src ? refspec->src : refspec->dst;
899 if (!refspec->dst)
901 continue;
902 if (refspec->pattern) {
903 if (match_name_with_pattern(key, needle, value, result)) {
904 query->force = refspec->force;
905 return 0;
906 }
907 } else if (!strcmp(needle, key)) {
908 *result = xstrdup(value);
909 query->force = refspec->force;
910 return 0;
911 }
912 }
913 return -1;
914}
915char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
917 const char *name)
918{
919 struct refspec query;
920 memset(&query, 0, sizeof(struct refspec));
922 query.src = (char *)name;
923 if (query_refspecs(refspecs, nr_refspec, &query))
925 return NULL;
926 return query.dst;
928}
929int remote_find_tracking(struct remote *remote, struct refspec *refspec)
931{
932 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
933}
934static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
936 const char *name)
937{
938 size_t len = strlen(name);
939 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
940 memcpy(ref->name, prefix, prefixlen);
941 memcpy(ref->name + prefixlen, name, len);
942 return ref;
943}
944struct ref *alloc_ref(const char *name)
946{
947 return alloc_ref_with_prefix("", 0, name);
948}
949struct ref *copy_ref(const struct ref *ref)
951{
952 struct ref *cpy;
953 size_t len;
954 if (!ref)
955 return NULL;
956 len = strlen(ref->name);
957 cpy = xmalloc(sizeof(struct ref) + len + 1);
958 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
959 cpy->next = NULL;
960 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
961 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
962 cpy->peer_ref = copy_ref(ref->peer_ref);
963 return cpy;
964}
965struct ref *copy_ref_list(const struct ref *ref)
967{
968 struct ref *ret = NULL;
969 struct ref **tail = &ret;
970 while (ref) {
971 *tail = copy_ref(ref);
972 ref = ref->next;
973 tail = &((*tail)->next);
974 }
975 return ret;
976}
977static void free_ref(struct ref *ref)
979{
980 if (!ref)
981 return;
982 free_ref(ref->peer_ref);
983 free(ref->remote_status);
984 free(ref->symref);
985 free(ref);
986}
987void free_refs(struct ref *ref)
989{
990 struct ref *next;
991 while (ref) {
992 next = ref->next;
993 free_ref(ref);
994 ref = next;
995 }
996}
997int ref_compare_name(const void *va, const void *vb)
999{
1000 const struct ref *a = va, *b = vb;
1001 return strcmp(a->name, b->name);
1002}
1003static void *ref_list_get_next(const void *a)
1005{
1006 return ((const struct ref *)a)->next;
1007}
1008static void ref_list_set_next(void *a, void *next)
1010{
1011 ((struct ref *)a)->next = next;
1012}
1013void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1015{
1016 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1017}
1018int count_refspec_match(const char *pattern,
1020 struct ref *refs,
1021 struct ref **matched_ref)
1022{
1023 int patlen = strlen(pattern);
1024 struct ref *matched_weak = NULL;
1025 struct ref *matched = NULL;
1026 int weak_match = 0;
1027 int match = 0;
1028 for (weak_match = match = 0; refs; refs = refs->next) {
1030 char *name = refs->name;
1031 int namelen = strlen(name);
1032 if (!refname_match(pattern, name))
1034 continue;
1035 /* A match is "weak" if it is with refs outside
1037 * heads or tags, and did not specify the pattern
1038 * in full (e.g. "refs/remotes/origin/master") or at
1039 * least from the toplevel (e.g. "remotes/origin/master");
1040 * otherwise "git push $URL master" would result in
1041 * ambiguity between remotes/origin/master and heads/master
1042 * at the remote site.
1043 */
1044 if (namelen != patlen &&
1045 patlen != namelen - 5 &&
1046 !starts_with(name, "refs/heads/") &&
1047 !starts_with(name, "refs/tags/")) {
1048 /* We want to catch the case where only weak
1049 * matches are found and there are multiple
1050 * matches, and where more than one strong
1051 * matches are found, as ambiguous. One
1052 * strong match with zero or more weak matches
1053 * are acceptable as a unique match.
1054 */
1055 matched_weak = refs;
1056 weak_match++;
1057 }
1058 else {
1059 matched = refs;
1060 match++;
1061 }
1062 }
1063 if (!matched) {
1064 if (matched_ref)
1065 *matched_ref = matched_weak;
1066 return weak_match;
1067 }
1068 else {
1069 if (matched_ref)
1070 *matched_ref = matched;
1071 return match;
1072 }
1073}
1074static void tail_link_ref(struct ref *ref, struct ref ***tail)
1076{
1077 **tail = ref;
1078 while (ref->next)
1079 ref = ref->next;
1080 *tail = &ref->next;
1081}
1082static struct ref *alloc_delete_ref(void)
1084{
1085 struct ref *ref = alloc_ref("(delete)");
1086 hashclr(ref->new_sha1);
1087 return ref;
1088}
1089static int try_explicit_object_name(const char *name,
1091 struct ref **match)
1092{
1093 unsigned char sha1[20];
1094 if (!*name) {
1096 if (match)
1097 *match = alloc_delete_ref();
1098 return 0;
1099 }
1100 if (get_sha1(name, sha1))
1102 return -1;
1103 if (match) {
1105 *match = alloc_ref(name);
1106 hashcpy((*match)->new_sha1, sha1);
1107 }
1108 return 0;
1109}
1110static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1112{
1113 struct ref *ret = alloc_ref(name);
1114 tail_link_ref(ret, tail);
1115 return ret;
1116}
1117static char *guess_ref(const char *name, struct ref *peer)
1119{
1120 struct strbuf buf = STRBUF_INIT;
1121 unsigned char sha1[20];
1122 const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1124 if (!r)
1125 return NULL;
1126 if (starts_with(r, "refs/heads/"))
1128 strbuf_addstr(&buf, "refs/heads/");
1129 else if (starts_with(r, "refs/tags/"))
1130 strbuf_addstr(&buf, "refs/tags/");
1131 else
1132 return NULL;
1133 strbuf_addstr(&buf, name);
1135 return strbuf_detach(&buf, NULL);
1136}
1137static int match_explicit_lhs(struct ref *src,
1139 struct refspec *rs,
1140 struct ref **match,
1141 int *allocated_match)
1142{
1143 switch (count_refspec_match(rs->src, src, match)) {
1144 case 1:
1145 if (allocated_match)
1146 *allocated_match = 0;
1147 return 0;
1148 case 0:
1149 /* The source could be in the get_sha1() format
1150 * not a reference name. :refs/other is a
1151 * way to delete 'other' ref at the remote end.
1152 */
1153 if (try_explicit_object_name(rs->src, match) < 0)
1154 return error("src refspec %s does not match any.", rs->src);
1155 if (allocated_match)
1156 *allocated_match = 1;
1157 return 0;
1158 default:
1159 return error("src refspec %s matches more than one.", rs->src);
1160 }
1161}
1162static int match_explicit(struct ref *src, struct ref *dst,
1164 struct ref ***dst_tail,
1165 struct refspec *rs)
1166{
1167 struct ref *matched_src, *matched_dst;
1168 int allocated_src;
1169 const char *dst_value = rs->dst;
1171 char *dst_guess;
1172 if (rs->pattern || rs->matching)
1174 return 0;
1175 matched_src = matched_dst = NULL;
1177 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1178 return -1;
1179 if (!dst_value) {
1181 unsigned char sha1[20];
1182 int flag;
1183 dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1185 if (!dst_value ||
1186 ((flag & REF_ISSYMREF) &&
1187 !starts_with(dst_value, "refs/heads/")))
1188 die("%s cannot be resolved to branch.",
1189 matched_src->name);
1190 }
1191 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1193 case 1:
1194 break;
1195 case 0:
1196 if (!memcmp(dst_value, "refs/", 5))
1197 matched_dst = make_linked_ref(dst_value, dst_tail);
1198 else if (is_null_sha1(matched_src->new_sha1))
1199 error("unable to delete '%s': remote ref does not exist",
1200 dst_value);
1201 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1202 matched_dst = make_linked_ref(dst_guess, dst_tail);
1203 else
1204 error("unable to push to unqualified destination: %s\n"
1205 "The destination refspec neither matches an "
1206 "existing ref on the remote nor\n"
1207 "begins with refs/, and we are unable to "
1208 "guess a prefix based on the source ref.",
1209 dst_value);
1210 break;
1211 default:
1212 matched_dst = NULL;
1213 error("dst refspec %s matches more than one.",
1214 dst_value);
1215 break;
1216 }
1217 if (!matched_dst)
1218 return -1;
1219 if (matched_dst->peer_ref)
1220 return error("dst ref %s receives from more than one src.",
1221 matched_dst->name);
1222 else {
1223 matched_dst->peer_ref = allocated_src ?
1224 matched_src :
1225 copy_ref(matched_src);
1226 matched_dst->force = rs->force;
1227 }
1228 return 0;
1229}
1230static int match_explicit_refs(struct ref *src, struct ref *dst,
1232 struct ref ***dst_tail, struct refspec *rs,
1233 int rs_nr)
1234{
1235 int i, errs;
1236 for (i = errs = 0; i < rs_nr; i++)
1237 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1238 return errs;
1239}
1240static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1242 int send_mirror, int direction, const struct refspec **ret_pat)
1243{
1244 const struct refspec *pat;
1245 char *name;
1246 int i;
1247 int matching_refs = -1;
1248 for (i = 0; i < rs_nr; i++) {
1249 if (rs[i].matching &&
1250 (matching_refs == -1 || rs[i].force)) {
1251 matching_refs = i;
1252 continue;
1253 }
1254 if (rs[i].pattern) {
1256 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1257 int match;
1258 if (direction == FROM_SRC)
1259 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1260 else
1261 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1262 if (match) {
1263 matching_refs = i;
1264 break;
1265 }
1266 }
1267 }
1268 if (matching_refs == -1)
1269 return NULL;
1270 pat = rs + matching_refs;
1272 if (pat->matching) {
1273 /*
1274 * "matching refs"; traditionally we pushed everything
1275 * including refs outside refs/heads/ hierarchy, but
1276 * that does not make much sense these days.
1277 */
1278 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1279 return NULL;
1280 name = xstrdup(ref->name);
1281 }
1282 if (ret_pat)
1283 *ret_pat = pat;
1284 return name;
1285}
1286static struct ref **tail_ref(struct ref **head)
1288{
1289 struct ref **tail = head;
1290 while (*tail)
1291 tail = &((*tail)->next);
1292 return tail;
1293}
1294struct tips {
1296 struct commit **tip;
1297 int nr, alloc;
1298};
1299static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1301{
1302 struct commit *commit;
1303 if (is_null_sha1(sha1))
1305 return;
1306 commit = lookup_commit_reference_gently(sha1, 1);
1307 if (!commit || (commit->object.flags & TMP_MARK))
1308 return;
1309 commit->object.flags |= TMP_MARK;
1310 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1311 tips->tip[tips->nr++] = commit;
1312}
1313static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1315{
1316 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1317 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1318 struct string_list_item *item;
1319 struct ref *ref;
1320 struct tips sent_tips;
1321 /*
1323 * Collect everything we know they would have at the end of
1324 * this push, and collect all tags they have.
1325 */
1326 memset(&sent_tips, 0, sizeof(sent_tips));
1327 for (ref = *dst; ref; ref = ref->next) {
1328 if (ref->peer_ref &&
1329 !is_null_sha1(ref->peer_ref->new_sha1))
1330 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1331 else
1332 add_to_tips(&sent_tips, ref->old_sha1);
1333 if (starts_with(ref->name, "refs/tags/"))
1334 string_list_append(&dst_tag, ref->name);
1335 }
1336 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1337 sort_string_list(&dst_tag);
1339 /* Collect tags they do not have. */
1341 for (ref = src; ref; ref = ref->next) {
1342 if (!starts_with(ref->name, "refs/tags/"))
1343 continue; /* not a tag */
1344 if (string_list_has_string(&dst_tag, ref->name))
1345 continue; /* they already have it */
1346 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1347 continue; /* be conservative */
1348 item = string_list_append(&src_tag, ref->name);
1349 item->util = ref;
1350 }
1351 string_list_clear(&dst_tag, 0);
1352 /*
1354 * At this point, src_tag lists tags that are missing from
1355 * dst, and sent_tips lists the tips we are pushing or those
1356 * that we know they already have. An element in the src_tag
1357 * that is an ancestor of any of the sent_tips needs to be
1358 * sent to the other side.
1359 */
1360 if (sent_tips.nr) {
1361 for_each_string_list_item(item, &src_tag) {
1362 struct ref *ref = item->util;
1363 struct ref *dst_ref;
1364 struct commit *commit;
1365 if (is_null_sha1(ref->new_sha1))
1367 continue;
1368 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1369 if (!commit)
1370 /* not pushing a commit, which is not an error */
1371 continue;
1372 /*
1374 * Is this tag, which they do not have, reachable from
1375 * any of the commits we are sending?
1376 */
1377 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1378 continue;
1379 /* Add it in */
1381 dst_ref = make_linked_ref(ref->name, dst_tail);
1382 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1383 dst_ref->peer_ref = copy_ref(ref);
1384 }
1385 }
1386 string_list_clear(&src_tag, 0);
1387 free(sent_tips.tip);
1388}
1389struct ref *find_ref_by_name(const struct ref *list, const char *name)
1391{
1392 for ( ; list; list = list->next)
1393 if (!strcmp(list->name, name))
1394 return (struct ref *)list;
1395 return NULL;
1396}
1397static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1399{
1400 for ( ; ref; ref = ref->next)
1401 string_list_append_nodup(ref_index, ref->name)->util = ref;
1402 sort_string_list(ref_index);
1404}
1405/*
1407 * Given only the set of local refs, sanity-check the set of push
1408 * refspecs. We can't catch all errors that match_push_refs would,
1409 * but we can catch some errors early before even talking to the
1410 * remote side.
1411 */
1412int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1413{
1414 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1415 int ret = 0;
1416 int i;
1417 for (i = 0; i < nr_refspec; i++) {
1419 struct refspec *rs = refspec + i;
1420 if (rs->pattern || rs->matching)
1422 continue;
1423 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1425 }
1426 free_refspec(nr_refspec, refspec);
1428 return ret;
1429}
1430/*
1432 * Given the set of refs the local repository has, the set of refs the
1433 * remote repository has, and the refspec used for push, determine
1434 * what remote refs we will update and with what value by setting
1435 * peer_ref (which object is being pushed) and force (if the push is
1436 * forced) in elements of "dst". The function may add new elements to
1437 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1438 */
1439int match_push_refs(struct ref *src, struct ref **dst,
1440 int nr_refspec, const char **refspec, int flags)
1441{
1442 struct refspec *rs;
1443 int send_all = flags & MATCH_REFS_ALL;
1444 int send_mirror = flags & MATCH_REFS_MIRROR;
1445 int send_prune = flags & MATCH_REFS_PRUNE;
1446 int errs;
1447 static const char *default_refspec[] = { ":", NULL };
1448 struct ref *ref, **dst_tail = tail_ref(dst);
1449 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1450 if (!nr_refspec) {
1452 nr_refspec = 1;
1453 refspec = default_refspec;
1454 }
1455 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1456 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1457 /* pick the remainder */
1459 for (ref = src; ref; ref = ref->next) {
1460 struct string_list_item *dst_item;
1461 struct ref *dst_peer;
1462 const struct refspec *pat = NULL;
1463 char *dst_name;
1464 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1466 if (!dst_name)
1467 continue;
1468 if (!dst_ref_index.nr)
1470 prepare_ref_index(&dst_ref_index, *dst);
1471 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1473 dst_peer = dst_item ? dst_item->util : NULL;
1474 if (dst_peer) {
1475 if (dst_peer->peer_ref)
1476 /* We're already sending something to this ref. */
1477 goto free_name;
1478 } else {
1479 if (pat->matching && !(send_all || send_mirror))
1480 /*
1481 * Remote doesn't have it, and we have no
1482 * explicit pattern, and we don't have
1483 * --all or --mirror.
1484 */
1485 goto free_name;
1486 /* Create a new one and link it */
1488 dst_peer = make_linked_ref(dst_name, &dst_tail);
1489 hashcpy(dst_peer->new_sha1, ref->new_sha1);
1490 string_list_insert(&dst_ref_index,
1491 dst_peer->name)->util = dst_peer;
1492 }
1493 dst_peer->peer_ref = copy_ref(ref);
1494 dst_peer->force = pat->force;
1495 free_name:
1496 free(dst_name);
1497 }
1498 string_list_clear(&dst_ref_index, 0);
1500 if (flags & MATCH_REFS_FOLLOW_TAGS)
1502 add_missing_tags(src, dst, &dst_tail);
1503 if (send_prune) {
1505 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1506 /* check for missing refs on the remote */
1507 for (ref = *dst; ref; ref = ref->next) {
1508 char *src_name;
1509 if (ref->peer_ref)
1511 /* We're already sending something to this ref. */
1512 continue;
1513 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1515 if (src_name) {
1516 if (!src_ref_index.nr)
1517 prepare_ref_index(&src_ref_index, src);
1518 if (!string_list_has_string(&src_ref_index,
1519 src_name))
1520 ref->peer_ref = alloc_delete_ref();
1521 free(src_name);
1522 }
1523 }
1524 string_list_clear(&src_ref_index, 0);
1525 }
1526 if (errs)
1527 return -1;
1528 return 0;
1529}
1530void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1532 int force_update)
1533{
1534 struct ref *ref;
1535 for (ref = remote_refs; ref; ref = ref->next) {
1537 int force_ref_update = ref->force || force_update;
1538 int reject_reason = 0;
1539 if (ref->peer_ref)
1541 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1542 else if (!send_mirror)
1543 continue;
1544 ref->deletion = is_null_sha1(ref->new_sha1);
1546 if (!ref->deletion &&
1547 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1548 ref->status = REF_STATUS_UPTODATE;
1549 continue;
1550 }
1551 /*
1553 * Bypass the usual "must fast-forward" check but
1554 * replace it with a weaker "the old value must be
1555 * this value we observed". If the remote ref has
1556 * moved and is now different from what we expect,
1557 * reject any push.
1558 *
1559 * It also is an error if the user told us to check
1560 * with the remote-tracking branch to find the value
1561 * to expect, but we did not have such a tracking
1562 * branch.
1563 */
1564 if (ref->expect_old_sha1) {
1565 if (ref->expect_old_no_trackback ||
1566 hashcmp(ref->old_sha1, ref->old_sha1_expect))
1567 reject_reason = REF_STATUS_REJECT_STALE;
1568 }
1569 /*
1571 * The usual "must fast-forward" rules.
1572 *
1573 * Decide whether an individual refspec A:B can be
1574 * pushed. The push will succeed if any of the
1575 * following are true:
1576 *
1577 * (1) the remote reference B does not exist
1578 *
1579 * (2) the remote reference B is being removed (i.e.,
1580 * pushing :B where no source is specified)
1581 *
1582 * (3) the destination is not under refs/tags/, and
1583 * if the old and new value is a commit, the new
1584 * is a descendant of the old.
1585 *
1586 * (4) it is forced using the +A:B notation, or by
1587 * passing the --force argument
1588 */
1589 else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1591 if (starts_with(ref->name, "refs/tags/"))
1592 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1593 else if (!has_sha1_file(ref->old_sha1))
1594 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1595 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1596 !lookup_commit_reference_gently(ref->new_sha1, 1))
1597 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1598 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1599 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1600 }
1601 /*
1603 * "--force" will defeat any rejection implemented
1604 * by the rules above.
1605 */
1606 if (!force_ref_update)
1607 ref->status = reject_reason;
1608 else if (reject_reason)
1609 ref->forced_update = 1;
1610 }
1611}
1612struct branch *branch_get(const char *name)
1614{
1615 struct branch *ret;
1616 read_config();
1618 if (!name || !*name || !strcmp(name, "HEAD"))
1619 ret = current_branch;
1620 else
1621 ret = make_branch(name, 0);
1622 if (ret && ret->remote_name) {
1623 ret->remote = remote_get(ret->remote_name);
1624 if (ret->merge_nr) {
1625 int i;
1626 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1627 for (i = 0; i < ret->merge_nr; i++) {
1628 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1629 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1630 if (remote_find_tracking(ret->remote, ret->merge[i])
1631 && !strcmp(ret->remote_name, "."))
1632 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1633 }
1634 }
1635 }
1636 return ret;
1637}
1638int branch_has_merge_config(struct branch *branch)
1640{
1641 return branch && !!branch->merge;
1642}
1643int branch_merge_matches(struct branch *branch,
1645 int i,
1646 const char *refname)
1647{
1648 if (!branch || i < 0 || i >= branch->merge_nr)
1649 return 0;
1650 return refname_match(branch->merge[i]->src, refname);
1651}
1652static int ignore_symref_update(const char *refname)
1654{
1655 unsigned char sha1[20];
1656 int flag;
1657 if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1659 return 0; /* non-existing refs are OK */
1660 return (flag & REF_ISSYMREF);
1661}
1662/*
1664 * Create and return a list of (struct ref) consisting of copies of
1665 * each remote_ref that matches refspec. refspec must be a pattern.
1666 * Fill in the copies' peer_ref to describe the local tracking refs to
1667 * which they map. Omit any references that would map to an existing
1668 * local symbolic ref.
1669 */
1670static struct ref *get_expanded_map(const struct ref *remote_refs,
1671 const struct refspec *refspec)
1672{
1673 const struct ref *ref;
1674 struct ref *ret = NULL;
1675 struct ref **tail = &ret;
1676 for (ref = remote_refs; ref; ref = ref->next) {
1678 char *expn_name = NULL;
1679 if (strchr(ref->name, '^'))
1681 continue; /* a dereference item */
1682 if (match_name_with_pattern(refspec->src, ref->name,
1683 refspec->dst, &expn_name) &&
1684 !ignore_symref_update(expn_name)) {
1685 struct ref *cpy = copy_ref(ref);
1686 cpy->peer_ref = alloc_ref(expn_name);
1688 if (refspec->force)
1689 cpy->peer_ref->force = 1;
1690 *tail = cpy;
1691 tail = &cpy->next;
1692 }
1693 free(expn_name);
1694 }
1695 return ret;
1697}
1698static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1700{
1701 const struct ref *ref;
1702 for (ref = refs; ref; ref = ref->next) {
1703 if (refname_match(name, ref->name))
1704 return ref;
1705 }
1706 return NULL;
1707}
1708struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1710{
1711 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1712 if (!ref)
1714 return NULL;
1715 return copy_ref(ref);
1717}
1718static struct ref *get_local_ref(const char *name)
1720{
1721 if (!name || name[0] == '\0')
1722 return NULL;
1723 if (starts_with(name, "refs/"))
1725 return alloc_ref(name);
1726 if (starts_with(name, "heads/") ||
1728 starts_with(name, "tags/") ||
1729 starts_with(name, "remotes/"))
1730 return alloc_ref_with_prefix("refs/", 5, name);
1731 return alloc_ref_with_prefix("refs/heads/", 11, name);
1733}
1734int get_fetch_map(const struct ref *remote_refs,
1736 const struct refspec *refspec,
1737 struct ref ***tail,
1738 int missing_ok)
1739{
1740 struct ref *ref_map, **rmp;
1741 if (refspec->pattern) {
1743 ref_map = get_expanded_map(remote_refs, refspec);
1744 } else {
1745 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1746 if (refspec->exact_sha1) {
1748 ref_map = alloc_ref(name);
1749 get_sha1_hex(name, ref_map->old_sha1);
1750 } else {
1751 ref_map = get_remote_ref(remote_refs, name);
1752 }
1753 if (!missing_ok && !ref_map)
1754 die("Couldn't find remote ref %s", name);
1755 if (ref_map) {
1756 ref_map->peer_ref = get_local_ref(refspec->dst);
1757 if (ref_map->peer_ref && refspec->force)
1758 ref_map->peer_ref->force = 1;
1759 }
1760 }
1761 for (rmp = &ref_map; *rmp; ) {
1763 if ((*rmp)->peer_ref) {
1764 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1765 check_refname_format((*rmp)->peer_ref->name, 0)) {
1766 struct ref *ignore = *rmp;
1767 error("* Ignoring funny ref '%s' locally",
1768 (*rmp)->peer_ref->name);
1769 *rmp = (*rmp)->next;
1770 free(ignore->peer_ref);
1771 free(ignore);
1772 continue;
1773 }
1774 }
1775 rmp = &((*rmp)->next);
1776 }
1777 if (ref_map)
1779 tail_link_ref(ref_map, tail);
1780 return 0;
1782}
1783int resolve_remote_symref(struct ref *ref, struct ref *list)
1785{
1786 if (!ref->symref)
1787 return 0;
1788 for (; list; list = list->next)
1789 if (!strcmp(ref->symref, list->name)) {
1790 hashcpy(ref->old_sha1, list->old_sha1);
1791 return 0;
1792 }
1793 return 1;
1794}
1795static void unmark_and_free(struct commit_list *list, unsigned int mark)
1797{
1798 while (list) {
1799 struct commit_list *temp = list;
1800 temp->item->object.flags &= ~mark;
1801 list = temp->next;
1802 free(temp);
1803 }
1804}
1805int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1807{
1808 struct object *o;
1809 struct commit *old, *new;
1810 struct commit_list *list, *used;
1811 int found = 0;
1812 /*
1814 * Both new and old must be commit-ish and new is descendant of
1815 * old. Otherwise we require --force.
1816 */
1817 o = deref_tag(parse_object(old_sha1), NULL, 0);
1818 if (!o || o->type != OBJ_COMMIT)
1819 return 0;
1820 old = (struct commit *) o;
1821 o = deref_tag(parse_object(new_sha1), NULL, 0);
1823 if (!o || o->type != OBJ_COMMIT)
1824 return 0;
1825 new = (struct commit *) o;
1826 if (parse_commit(new) < 0)
1828 return 0;
1829 used = list = NULL;
1831 commit_list_insert(new, &list);
1832 while (list) {
1833 new = pop_most_recent_commit(&list, TMP_MARK);
1834 commit_list_insert(new, &used);
1835 if (new == old) {
1836 found = 1;
1837 break;
1838 }
1839 }
1840 unmark_and_free(list, TMP_MARK);
1841 unmark_and_free(used, TMP_MARK);
1842 return found;
1843}
1844/*
1846 * Compare a branch with its upstream, and save their differences (number
1847 * of commits) in *num_ours and *num_theirs.
1848 *
1849 * Return 0 if branch has no upstream (no base), -1 if upstream is missing
1850 * (with "gone" base), otherwise 1 (with base).
1851 */
1852int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1853{
1854 unsigned char sha1[20];
1855 struct commit *ours, *theirs;
1856 char symmetric[84];
1857 struct rev_info revs;
1858 const char *rev_argv[10], *base;
1859 int rev_argc;
1860 /* Cannot stat unless we are marked to build on top of somebody else. */
1862 if (!branch ||
1863 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1864 return 0;
1865 /* Cannot stat if what we used to build on no longer exists */
1867 base = branch->merge[0]->dst;
1868 if (read_ref(base, sha1))
1869 return -1;
1870 theirs = lookup_commit_reference(sha1);
1871 if (!theirs)
1872 return -1;
1873 if (read_ref(branch->refname, sha1))
1875 return -1;
1876 ours = lookup_commit_reference(sha1);
1877 if (!ours)
1878 return -1;
1879 /* are we the same? */
1881 if (theirs == ours) {
1882 *num_theirs = *num_ours = 0;
1883 return 1;
1884 }
1885 /* Run "rev-list --left-right ours...theirs" internally... */
1887 rev_argc = 0;
1888 rev_argv[rev_argc++] = NULL;
1889 rev_argv[rev_argc++] = "--left-right";
1890 rev_argv[rev_argc++] = symmetric;
1891 rev_argv[rev_argc++] = "--";
1892 rev_argv[rev_argc] = NULL;
1893 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1895 strcpy(symmetric + 40, "...");
1896 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1897 init_revisions(&revs, NULL);
1899 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1900 prepare_revision_walk(&revs);
1901 /* ... and count the commits on each side. */
1903 *num_ours = 0;
1904 *num_theirs = 0;
1905 while (1) {
1906 struct commit *c = get_revision(&revs);
1907 if (!c)
1908 break;
1909 if (c->object.flags & SYMMETRIC_LEFT)
1910 (*num_ours)++;
1911 else
1912 (*num_theirs)++;
1913 }
1914 /* clear object flags smudged by the above traversal */
1916 clear_commit_marks(ours, ALL_REV_FLAGS);
1917 clear_commit_marks(theirs, ALL_REV_FLAGS);
1918 return 1;
1919}
1920/*
1922 * Return true when there is anything to report, otherwise false.
1923 */
1924int format_tracking_info(struct branch *branch, struct strbuf *sb)
1925{
1926 int ours, theirs;
1927 const char *base;
1928 int upstream_is_gone = 0;
1929 switch (stat_tracking_info(branch, &ours, &theirs)) {
1931 case 0:
1932 /* no base */
1933 return 0;
1934 case -1:
1935 /* with "gone" base */
1936 upstream_is_gone = 1;
1937 break;
1938 default:
1939 /* with base */
1940 break;
1941 }
1942 base = branch->merge[0]->dst;
1944 base = shorten_unambiguous_ref(base, 0);
1945 if (upstream_is_gone) {
1946 strbuf_addf(sb,
1947 _("Your branch is based on '%s', but the upstream is gone.\n"),
1948 base);
1949 if (advice_status_hints)
1950 strbuf_addf(sb,
1951 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
1952 } else if (!ours && !theirs) {
1953 strbuf_addf(sb,
1954 _("Your branch is up-to-date with '%s'.\n"),
1955 base);
1956 } else if (!theirs) {
1957 strbuf_addf(sb,
1958 Q_("Your branch is ahead of '%s' by %d commit.\n",
1959 "Your branch is ahead of '%s' by %d commits.\n",
1960 ours),
1961 base, ours);
1962 if (advice_status_hints)
1963 strbuf_addf(sb,
1964 _(" (use \"git push\" to publish your local commits)\n"));
1965 } else if (!ours) {
1966 strbuf_addf(sb,
1967 Q_("Your branch is behind '%s' by %d commit, "
1968 "and can be fast-forwarded.\n",
1969 "Your branch is behind '%s' by %d commits, "
1970 "and can be fast-forwarded.\n",
1971 theirs),
1972 base, theirs);
1973 if (advice_status_hints)
1974 strbuf_addf(sb,
1975 _(" (use \"git pull\" to update your local branch)\n"));
1976 } else {
1977 strbuf_addf(sb,
1978 Q_("Your branch and '%s' have diverged,\n"
1979 "and have %d and %d different commit each, "
1980 "respectively.\n",
1981 "Your branch and '%s' have diverged,\n"
1982 "and have %d and %d different commits each, "
1983 "respectively.\n",
1984 theirs),
1985 base, ours, theirs);
1986 if (advice_status_hints)
1987 strbuf_addf(sb,
1988 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
1989 }
1990 return 1;
1991}
1992static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1994{
1995 struct ref ***local_tail = cb_data;
1996 struct ref *ref;
1997 int len;
1998 /* we already know it starts with refs/ to get here */
2000 if (check_refname_format(refname + 5, 0))
2001 return 0;
2002 len = strlen(refname) + 1;
2004 ref = xcalloc(1, sizeof(*ref) + len);
2005 hashcpy(ref->new_sha1, sha1);
2006 memcpy(ref->name, refname, len);
2007 **local_tail = ref;
2008 *local_tail = &ref->next;
2009 return 0;
2010}
2011struct ref *get_local_heads(void)
2013{
2014 struct ref *local_refs = NULL, **local_tail = &local_refs;
2015 for_each_ref(one_local_ref, &local_tail);
2016 return local_refs;
2017}
2018struct ref *guess_remote_head(const struct ref *head,
2020 const struct ref *refs,
2021 int all)
2022{
2023 const struct ref *r;
2024 struct ref *list = NULL;
2025 struct ref **tail = &list;
2026 if (!head)
2028 return NULL;
2029 /*
2031 * Some transports support directly peeking at
2032 * where HEAD points; if that is the case, then
2033 * we don't have to guess.
2034 */
2035 if (head->symref)
2036 return copy_ref(find_ref_by_name(refs, head->symref));
2037 /* If refs/heads/master could be right, it is. */
2039 if (!all) {
2040 r = find_ref_by_name(refs, "refs/heads/master");
2041 if (r && !hashcmp(r->old_sha1, head->old_sha1))
2042 return copy_ref(r);
2043 }
2044 /* Look for another ref that points there */
2046 for (r = refs; r; r = r->next) {
2047 if (r != head &&
2048 starts_with(r->name, "refs/heads/") &&
2049 !hashcmp(r->old_sha1, head->old_sha1)) {
2050 *tail = copy_ref(r);
2051 tail = &((*tail)->next);
2052 if (!all)
2053 break;
2054 }
2055 }
2056 return list;
2058}
2059struct stale_heads_info {
2061 struct string_list *ref_names;
2062 struct ref **stale_refs_tail;
2063 struct refspec *refs;
2064 int ref_count;
2065};
2066static int get_stale_heads_cb(const char *refname,
2068 const unsigned char *sha1, int flags, void *cb_data)
2069{
2070 struct stale_heads_info *info = cb_data;
2071 struct string_list matches = STRING_LIST_INIT_DUP;
2072 struct refspec query;
2073 int i, stale = 1;
2074 memset(&query, 0, sizeof(struct refspec));
2075 query.dst = (char *)refname;
2076 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2078 if (matches.nr == 0)
2079 goto clean_exit; /* No matches */
2080 /*
2082 * If we did find a suitable refspec and it's not a symref and
2083 * it's not in the list of refs that currently exist in that
2084 * remote, we consider it to be stale. In order to deal with
2085 * overlapping refspecs, we need to go over all of the
2086 * matching refs.
2087 */
2088 if (flags & REF_ISSYMREF)
2089 goto clean_exit;
2090 for (i = 0; stale && i < matches.nr; i++)
2092 if (string_list_has_string(info->ref_names, matches.items[i].string))
2093 stale = 0;
2094 if (stale) {
2096 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2097 hashcpy(ref->new_sha1, sha1);
2098 }
2099clean_exit:
2101 string_list_clear(&matches, 0);
2102 return 0;
2103}
2104struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2106{
2107 struct ref *ref, *stale_refs = NULL;
2108 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2109 struct stale_heads_info info;
2110 info.ref_names = &ref_names;
2111 info.stale_refs_tail = &stale_refs;
2112 info.refs = refs;
2113 info.ref_count = ref_count;
2114 for (ref = fetch_map; ref; ref = ref->next)
2115 string_list_append(&ref_names, ref->name);
2116 sort_string_list(&ref_names);
2117 for_each_ref(get_stale_heads_cb, &info);
2118 string_list_clear(&ref_names, 0);
2119 return stale_refs;
2120}
2121/*
2123 * Compare-and-swap
2124 */
2125void clear_cas_option(struct push_cas_option *cas)
2126{
2127 int i;
2128 for (i = 0; i < cas->nr; i++)
2130 free(cas->entry[i].refname);
2131 free(cas->entry);
2132 memset(cas, 0, sizeof(*cas));
2133}
2134static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2136 const char *refname,
2137 size_t refnamelen)
2138{
2139 struct push_cas *entry;
2140 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2141 entry = &cas->entry[cas->nr++];
2142 memset(entry, 0, sizeof(*entry));
2143 entry->refname = xmemdupz(refname, refnamelen);
2144 return entry;
2145}
2146int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2148{
2149 const char *colon;
2150 struct push_cas *entry;
2151 if (unset) {
2153 /* "--no-<option>" */
2154 clear_cas_option(cas);
2155 return 0;
2156 }
2157 if (!arg) {
2159 /* just "--<option>" */
2160 cas->use_tracking_for_rest = 1;
2161 return 0;
2162 }
2163 /* "--<option>=refname" or "--<option>=refname:value" */
2165 colon = strchrnul(arg, ':');
2166 entry = add_cas_entry(cas, arg, colon - arg);
2167 if (!*colon)
2168 entry->use_tracking = 1;
2169 else if (get_sha1(colon + 1, entry->expect))
2170 return error("cannot parse expected object name '%s'", colon + 1);
2171 return 0;
2172}
2173int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2175{
2176 return parse_push_cas_option(opt->value, arg, unset);
2177}
2178int is_empty_cas(const struct push_cas_option *cas)
2180{
2181 return !cas->use_tracking_for_rest && !cas->nr;
2182}
2183/*
2185 * Look at remote.fetch refspec and see if we have a remote
2186 * tracking branch for the refname there. Fill its current
2187 * value in sha1[].
2188 * If we cannot do so, return negative to signal an error.
2189 */
2190static int remote_tracking(struct remote *remote, const char *refname,
2191 unsigned char sha1[20])
2192{
2193 char *dst;
2194 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2196 if (!dst)
2197 return -1; /* no tracking ref for refname at remote */
2198 if (read_ref(dst, sha1))
2199 return -1; /* we know what the tracking ref is but we cannot read it */
2200 return 0;
2201}
2202static void apply_cas(struct push_cas_option *cas,
2204 struct remote *remote,
2205 struct ref *ref)
2206{
2207 int i;
2208 /* Find an explicit --<option>=<name>[:<value>] entry */
2210 for (i = 0; i < cas->nr; i++) {
2211 struct push_cas *entry = &cas->entry[i];
2212 if (!refname_match(entry->refname, ref->name))
2213 continue;
2214 ref->expect_old_sha1 = 1;
2215 if (!entry->use_tracking)
2216 hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
2217 else if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2218 ref->expect_old_no_trackback = 1;
2219 return;
2220 }
2221 /* Are we using "--<option>" to cover all? */
2223 if (!cas->use_tracking_for_rest)
2224 return;
2225 ref->expect_old_sha1 = 1;
2227 if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2228 ref->expect_old_no_trackback = 1;
2229}
2230void apply_push_cas(struct push_cas_option *cas,
2232 struct remote *remote,
2233 struct ref *remote_refs)
2234{
2235 struct ref *ref;
2236 for (ref = remote_refs; ref; ref = ref->next)
2237 apply_cas(cas, remote, ref);
2238}