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Revert "rebase: fix run_specific_rebase's use of "return" on FreeBSD"
[git/debian.git] / remote.c
blobebed40dcb65df55ac81facbf5df59ddc28451872
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"
11
12 enum map_direction { FROM_SRC, FROM_DST };
13
14 static struct refspec s_tag_refspec = {
15 0,
16 1,
17 0,
18 0,
19 "refs/tags/*",
20 "refs/tags/*"
21 };
22
23 const struct refspec *tag_refspec = &s_tag_refspec;
24
25 struct counted_string {
26 size_t len;
27 const char *s;
28 };
29 struct 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 };
36 struct rewrites {
37 struct rewrite **rewrite;
38 int rewrite_alloc;
39 int rewrite_nr;
40 };
41
42 static struct remote **remotes;
43 static int remotes_alloc;
44 static int remotes_nr;
45
46 static struct branch **branches;
47 static int branches_alloc;
48 static int branches_nr;
49
50 static struct branch *current_branch;
51 static const char *default_remote_name;
52 static const char *branch_pushremote_name;
53 static const char *pushremote_name;
54 static int explicit_default_remote_name;
55
56 static struct rewrites rewrites;
57 static struct rewrites rewrites_push;
58
59 #define BUF_SIZE (2048)
60 static char buffer[BUF_SIZE];
61
62 static int valid_remote(const struct remote *remote)
63 {
64 return (!!remote->url) || (!!remote->foreign_vcs);
65 }
66
67 static 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
74 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
91 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 }
97
98 static 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 }
105
106 static 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 }
113
114 static 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 }
119
120 static 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 }
125
126 static 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 }
132
133 static 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 }
138
139 static struct remote *make_remote(const char *name, int len)
140 {
141 struct remote *ret;
142 int i;
143
144 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
151 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 }
161
162 static 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 }
168
169 static struct branch *make_branch(const char *name, int len)
170 {
171 struct branch *ret;
172 int i;
173 char *refname;
174
175 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
182 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
194 return ret;
195 }
196
197 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
198 {
199 struct rewrite *ret;
200 int i;
201
202 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
210 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 }
223
224 static 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 }
231
232 static void read_remotes_file(struct remote *remote)
233 {
234 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
235
236 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
243 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
255 while (isspace(*s))
256 s++;
257 if (!*s)
258 continue;
259
260 p = s + strlen(s);
261 while (isspace(p[-1]))
262 *--p = 0;
263
264 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 }
278
279 static 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
288 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
306 /*
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
318 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 }
334
335 static 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
384 if (!starts_with(key, "remote."))
385 return 0;
386 name = key + 7;
387
388 /* Handle remote.* variables */
389 if (!strcmp(name, "pushdefault"))
390 return git_config_string(&pushremote_name, key, value);
391
392 /* 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 }
460
461 static 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 }
479
480 static 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 starts_with(head_ref, "refs/heads/")) {
492 current_branch =
493 make_branch(head_ref + strlen("refs/heads/"), 0);
494 }
495 git_config(handle_config, NULL);
496 if (branch_pushremote_name) {
497 free((char *)pushremote_name);
498 pushremote_name = branch_pushremote_name;
499 }
500 alias_all_urls();
501 }
502
503 /*
504 * This function frees a refspec array.
505 * Warning: code paths should be checked to ensure that the src
506 * and dst pointers are always freeable pointers as well
507 * as the refspec pointer itself.
508 */
509 static void free_refspecs(struct refspec *refspec, int nr_refspec)
510 {
511 int i;
512
513 if (!refspec)
514 return;
515
516 for (i = 0; i < nr_refspec; i++) {
517 free(refspec[i].src);
518 free(refspec[i].dst);
519 }
520 free(refspec);
521 }
522
523 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
524 {
525 int i;
526 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
527
528 for (i = 0; i < nr_refspec; i++) {
529 size_t llen;
530 int is_glob;
531 const char *lhs, *rhs;
532 int flags;
533
534 is_glob = 0;
535
536 lhs = refspec[i];
537 if (*lhs == '+') {
538 rs[i].force = 1;
539 lhs++;
540 }
541
542 rhs = strrchr(lhs, ':');
543
544 /*
545 * Before going on, special case ":" (or "+:") as a refspec
546 * for pushing matching refs.
547 */
548 if (!fetch && rhs == lhs && rhs[1] == '\0') {
549 rs[i].matching = 1;
550 continue;
551 }
552
553 if (rhs) {
554 size_t rlen = strlen(++rhs);
555 is_glob = (1 <= rlen && strchr(rhs, '*'));
556 rs[i].dst = xstrndup(rhs, rlen);
557 }
558
559 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
560 if (1 <= llen && memchr(lhs, '*', llen)) {
561 if ((rhs && !is_glob) || (!rhs && fetch))
562 goto invalid;
563 is_glob = 1;
564 } else if (rhs && is_glob) {
565 goto invalid;
566 }
567
568 rs[i].pattern = is_glob;
569 rs[i].src = xstrndup(lhs, llen);
570 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
571
572 if (fetch) {
573 unsigned char unused[40];
574
575 /* LHS */
576 if (!*rs[i].src)
577 ; /* empty is ok; it means "HEAD" */
578 else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
579 rs[i].exact_sha1 = 1; /* ok */
580 else if (!check_refname_format(rs[i].src, flags))
581 ; /* valid looking ref is ok */
582 else
583 goto invalid;
584 /* RHS */
585 if (!rs[i].dst)
586 ; /* missing is ok; it is the same as empty */
587 else if (!*rs[i].dst)
588 ; /* empty is ok; it means "do not store" */
589 else if (!check_refname_format(rs[i].dst, flags))
590 ; /* valid looking ref is ok */
591 else
592 goto invalid;
593 } else {
594 /*
595 * LHS
596 * - empty is allowed; it means delete.
597 * - when wildcarded, it must be a valid looking ref.
598 * - otherwise, it must be an extended SHA-1, but
599 * there is no existing way to validate this.
600 */
601 if (!*rs[i].src)
602 ; /* empty is ok */
603 else if (is_glob) {
604 if (check_refname_format(rs[i].src, flags))
605 goto invalid;
606 }
607 else
608 ; /* anything goes, for now */
609 /*
610 * RHS
611 * - missing is allowed, but LHS then must be a
612 * valid looking ref.
613 * - empty is not allowed.
614 * - otherwise it must be a valid looking ref.
615 */
616 if (!rs[i].dst) {
617 if (check_refname_format(rs[i].src, flags))
618 goto invalid;
619 } else if (!*rs[i].dst) {
620 goto invalid;
621 } else {
622 if (check_refname_format(rs[i].dst, flags))
623 goto invalid;
624 }
625 }
626 }
627 return rs;
628
629 invalid:
630 if (verify) {
631 /*
632 * nr_refspec must be greater than zero and i must be valid
633 * since it is only possible to reach this point from within
634 * the for loop above.
635 */
636 free_refspecs(rs, i+1);
637 return NULL;
638 }
639 die("Invalid refspec '%s'", refspec[i]);
640 }
641
642 int valid_fetch_refspec(const char *fetch_refspec_str)
643 {
644 struct refspec *refspec;
645
646 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
647 free_refspecs(refspec, 1);
648 return !!refspec;
649 }
650
651 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
652 {
653 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
654 }
655
656 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
657 {
658 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
659 }
660
661 void free_refspec(int nr_refspec, struct refspec *refspec)
662 {
663 int i;
664 for (i = 0; i < nr_refspec; i++) {
665 free(refspec[i].src);
666 free(refspec[i].dst);
667 }
668 free(refspec);
669 }
670
671 static int valid_remote_nick(const char *name)
672 {
673 if (!name[0] || is_dot_or_dotdot(name))
674 return 0;
675 return !strchr(name, '/'); /* no slash */
676 }
677
678 static struct remote *remote_get_1(const char *name, const char *pushremote_name)
679 {
680 struct remote *ret;
681 int name_given = 0;
682
683 if (name)
684 name_given = 1;
685 else {
686 if (pushremote_name) {
687 name = pushremote_name;
688 name_given = 1;
689 } else {
690 name = default_remote_name;
691 name_given = explicit_default_remote_name;
692 }
693 }
694
695 ret = make_remote(name, 0);
696 if (valid_remote_nick(name)) {
697 if (!valid_remote(ret))
698 read_remotes_file(ret);
699 if (!valid_remote(ret))
700 read_branches_file(ret);
701 }
702 if (name_given && !valid_remote(ret))
703 add_url_alias(ret, name);
704 if (!valid_remote(ret))
705 return NULL;
706 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
707 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
708 return ret;
709 }
710
711 struct remote *remote_get(const char *name)
712 {
713 read_config();
714 return remote_get_1(name, NULL);
715 }
716
717 struct remote *pushremote_get(const char *name)
718 {
719 read_config();
720 return remote_get_1(name, pushremote_name);
721 }
722
723 int remote_is_configured(const char *name)
724 {
725 int i;
726 read_config();
727
728 for (i = 0; i < remotes_nr; i++)
729 if (!strcmp(name, remotes[i]->name))
730 return 1;
731 return 0;
732 }
733
734 int for_each_remote(each_remote_fn fn, void *priv)
735 {
736 int i, result = 0;
737 read_config();
738 for (i = 0; i < remotes_nr && !result; i++) {
739 struct remote *r = remotes[i];
740 if (!r)
741 continue;
742 if (!r->fetch)
743 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
744 r->fetch_refspec);
745 if (!r->push)
746 r->push = parse_push_refspec(r->push_refspec_nr,
747 r->push_refspec);
748 result = fn(r, priv);
749 }
750 return result;
751 }
752
753 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
754 {
755 if (strcmp(ref1->name, ref2->name)) {
756 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
757 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
758 die(_("Cannot fetch both %s and %s to %s"),
759 ref1->name, ref2->name, ref2->peer_ref->name);
760 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
761 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
762 warning(_("%s usually tracks %s, not %s"),
763 ref2->peer_ref->name, ref2->name, ref1->name);
764 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
765 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
766 die(_("%s tracks both %s and %s"),
767 ref2->peer_ref->name, ref1->name, ref2->name);
768 } else {
769 /*
770 * This last possibility doesn't occur because
771 * FETCH_HEAD_IGNORE entries always appear at
772 * the end of the list.
773 */
774 die(_("Internal error"));
775 }
776 }
777 free(ref2->peer_ref);
778 free(ref2);
779 }
780
781 struct ref *ref_remove_duplicates(struct ref *ref_map)
782 {
783 struct string_list refs = STRING_LIST_INIT_NODUP;
784 struct ref *retval = NULL;
785 struct ref **p = &retval;
786
787 while (ref_map) {
788 struct ref *ref = ref_map;
789
790 ref_map = ref_map->next;
791 ref->next = NULL;
792
793 if (!ref->peer_ref) {
794 *p = ref;
795 p = &ref->next;
796 } else {
797 struct string_list_item *item =
798 string_list_insert(&refs, ref->peer_ref->name);
799
800 if (item->util) {
801 /* Entry already existed */
802 handle_duplicate((struct ref *)item->util, ref);
803 } else {
804 *p = ref;
805 p = &ref->next;
806 item->util = ref;
807 }
808 }
809 }
810
811 string_list_clear(&refs, 0);
812 return retval;
813 }
814
815 int remote_has_url(struct remote *remote, const char *url)
816 {
817 int i;
818 for (i = 0; i < remote->url_nr; i++) {
819 if (!strcmp(remote->url[i], url))
820 return 1;
821 }
822 return 0;
823 }
824
825 static int match_name_with_pattern(const char *key, const char *name,
826 const char *value, char **result)
827 {
828 const char *kstar = strchr(key, '*');
829 size_t klen;
830 size_t ksuffixlen;
831 size_t namelen;
832 int ret;
833 if (!kstar)
834 die("Key '%s' of pattern had no '*'", key);
835 klen = kstar - key;
836 ksuffixlen = strlen(kstar + 1);
837 namelen = strlen(name);
838 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
839 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
840 if (ret && value) {
841 const char *vstar = strchr(value, '*');
842 size_t vlen;
843 size_t vsuffixlen;
844 if (!vstar)
845 die("Value '%s' of pattern has no '*'", value);
846 vlen = vstar - value;
847 vsuffixlen = strlen(vstar + 1);
848 *result = xmalloc(vlen + vsuffixlen +
849 strlen(name) -
850 klen - ksuffixlen + 1);
851 strncpy(*result, value, vlen);
852 strncpy(*result + vlen,
853 name + klen, namelen - klen - ksuffixlen);
854 strcpy(*result + vlen + namelen - klen - ksuffixlen,
855 vstar + 1);
856 }
857 return ret;
858 }
859
860 static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
861 {
862 int i;
863 int find_src = !query->src;
864
865 if (find_src && !query->dst)
866 error("query_refspecs_multiple: need either src or dst");
867
868 for (i = 0; i < ref_count; i++) {
869 struct refspec *refspec = &refs[i];
870 const char *key = find_src ? refspec->dst : refspec->src;
871 const char *value = find_src ? refspec->src : refspec->dst;
872 const char *needle = find_src ? query->dst : query->src;
873 char **result = find_src ? &query->src : &query->dst;
874
875 if (!refspec->dst)
876 continue;
877 if (refspec->pattern) {
878 if (match_name_with_pattern(key, needle, value, result))
879 string_list_append_nodup(results, *result);
880 } else if (!strcmp(needle, key)) {
881 string_list_append(results, value);
882 }
883 }
884 }
885
886 int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
887 {
888 int i;
889 int find_src = !query->src;
890 const char *needle = find_src ? query->dst : query->src;
891 char **result = find_src ? &query->src : &query->dst;
892
893 if (find_src && !query->dst)
894 return error("query_refspecs: need either src or dst");
895
896 for (i = 0; i < ref_count; i++) {
897 struct refspec *refspec = &refs[i];
898 const char *key = find_src ? refspec->dst : refspec->src;
899 const char *value = find_src ? refspec->src : refspec->dst;
900
901 if (!refspec->dst)
902 continue;
903 if (refspec->pattern) {
904 if (match_name_with_pattern(key, needle, value, result)) {
905 query->force = refspec->force;
906 return 0;
907 }
908 } else if (!strcmp(needle, key)) {
909 *result = xstrdup(value);
910 query->force = refspec->force;
911 return 0;
912 }
913 }
914 return -1;
915 }
916
917 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
918 const char *name)
919 {
920 struct refspec query;
921
922 memset(&query, 0, sizeof(struct refspec));
923 query.src = (char *)name;
924
925 if (query_refspecs(refspecs, nr_refspec, &query))
926 return NULL;
927
928 return query.dst;
929 }
930
931 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
932 {
933 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
934 }
935
936 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
937 const char *name)
938 {
939 size_t len = strlen(name);
940 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
941 memcpy(ref->name, prefix, prefixlen);
942 memcpy(ref->name + prefixlen, name, len);
943 return ref;
944 }
945
946 struct ref *alloc_ref(const char *name)
947 {
948 return alloc_ref_with_prefix("", 0, name);
949 }
950
951 struct ref *copy_ref(const struct ref *ref)
952 {
953 struct ref *cpy;
954 size_t len;
955 if (!ref)
956 return NULL;
957 len = strlen(ref->name);
958 cpy = xmalloc(sizeof(struct ref) + len + 1);
959 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
960 cpy->next = NULL;
961 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
962 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
963 cpy->peer_ref = copy_ref(ref->peer_ref);
964 return cpy;
965 }
966
967 struct ref *copy_ref_list(const struct ref *ref)
968 {
969 struct ref *ret = NULL;
970 struct ref **tail = &ret;
971 while (ref) {
972 *tail = copy_ref(ref);
973 ref = ref->next;
974 tail = &((*tail)->next);
975 }
976 return ret;
977 }
978
979 static void free_ref(struct ref *ref)
980 {
981 if (!ref)
982 return;
983 free_ref(ref->peer_ref);
984 free(ref->remote_status);
985 free(ref->symref);
986 free(ref);
987 }
988
989 void free_refs(struct ref *ref)
990 {
991 struct ref *next;
992 while (ref) {
993 next = ref->next;
994 free_ref(ref);
995 ref = next;
996 }
997 }
998
999 int ref_compare_name(const void *va, const void *vb)
1000 {
1001 const struct ref *a = va, *b = vb;
1002 return strcmp(a->name, b->name);
1003 }
1004
1005 static void *ref_list_get_next(const void *a)
1006 {
1007 return ((const struct ref *)a)->next;
1008 }
1009
1010 static void ref_list_set_next(void *a, void *next)
1011 {
1012 ((struct ref *)a)->next = next;
1013 }
1014
1015 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1016 {
1017 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1018 }
1019
1020 int count_refspec_match(const char *pattern,
1021 struct ref *refs,
1022 struct ref **matched_ref)
1023 {
1024 int patlen = strlen(pattern);
1025 struct ref *matched_weak = NULL;
1026 struct ref *matched = NULL;
1027 int weak_match = 0;
1028 int match = 0;
1029
1030 for (weak_match = match = 0; refs; refs = refs->next) {
1031 char *name = refs->name;
1032 int namelen = strlen(name);
1033
1034 if (!refname_match(pattern, name))
1035 continue;
1036
1037 /* A match is "weak" if it is with refs outside
1038 * heads or tags, and did not specify the pattern
1039 * in full (e.g. "refs/remotes/origin/master") or at
1040 * least from the toplevel (e.g. "remotes/origin/master");
1041 * otherwise "git push $URL master" would result in
1042 * ambiguity between remotes/origin/master and heads/master
1043 * at the remote site.
1044 */
1045 if (namelen != patlen &&
1046 patlen != namelen - 5 &&
1047 !starts_with(name, "refs/heads/") &&
1048 !starts_with(name, "refs/tags/")) {
1049 /* We want to catch the case where only weak
1050 * matches are found and there are multiple
1051 * matches, and where more than one strong
1052 * matches are found, as ambiguous. One
1053 * strong match with zero or more weak matches
1054 * are acceptable as a unique match.
1055 */
1056 matched_weak = refs;
1057 weak_match++;
1058 }
1059 else {
1060 matched = refs;
1061 match++;
1062 }
1063 }
1064 if (!matched) {
1065 *matched_ref = matched_weak;
1066 return weak_match;
1067 }
1068 else {
1069 *matched_ref = matched;
1070 return match;
1071 }
1072 }
1073
1074 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1075 {
1076 **tail = ref;
1077 while (ref->next)
1078 ref = ref->next;
1079 *tail = &ref->next;
1080 }
1081
1082 static struct ref *alloc_delete_ref(void)
1083 {
1084 struct ref *ref = alloc_ref("(delete)");
1085 hashclr(ref->new_sha1);
1086 return ref;
1087 }
1088
1089 static struct ref *try_explicit_object_name(const char *name)
1090 {
1091 unsigned char sha1[20];
1092 struct ref *ref;
1093
1094 if (!*name)
1095 return alloc_delete_ref();
1096 if (get_sha1(name, sha1))
1097 return NULL;
1098 ref = alloc_ref(name);
1099 hashcpy(ref->new_sha1, sha1);
1100 return ref;
1101 }
1102
1103 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1104 {
1105 struct ref *ret = alloc_ref(name);
1106 tail_link_ref(ret, tail);
1107 return ret;
1108 }
1109
1110 static char *guess_ref(const char *name, struct ref *peer)
1111 {
1112 struct strbuf buf = STRBUF_INIT;
1113 unsigned char sha1[20];
1114
1115 const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1116 if (!r)
1117 return NULL;
1118
1119 if (starts_with(r, "refs/heads/"))
1120 strbuf_addstr(&buf, "refs/heads/");
1121 else if (starts_with(r, "refs/tags/"))
1122 strbuf_addstr(&buf, "refs/tags/");
1123 else
1124 return NULL;
1125
1126 strbuf_addstr(&buf, name);
1127 return strbuf_detach(&buf, NULL);
1128 }
1129
1130 static int match_explicit(struct ref *src, struct ref *dst,
1131 struct ref ***dst_tail,
1132 struct refspec *rs)
1133 {
1134 struct ref *matched_src, *matched_dst;
1135 int copy_src;
1136
1137 const char *dst_value = rs->dst;
1138 char *dst_guess;
1139
1140 if (rs->pattern || rs->matching)
1141 return 0;
1142
1143 matched_src = matched_dst = NULL;
1144 switch (count_refspec_match(rs->src, src, &matched_src)) {
1145 case 1:
1146 copy_src = 1;
1147 break;
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 matched_src = try_explicit_object_name(rs->src);
1154 if (!matched_src)
1155 return error("src refspec %s does not match any.", rs->src);
1156 copy_src = 0;
1157 break;
1158 default:
1159 return error("src refspec %s matches more than one.", rs->src);
1160 }
1161
1162 if (!dst_value) {
1163 unsigned char sha1[20];
1164 int flag;
1165
1166 dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1167 if (!dst_value ||
1168 ((flag & REF_ISSYMREF) &&
1169 !starts_with(dst_value, "refs/heads/")))
1170 die("%s cannot be resolved to branch.",
1171 matched_src->name);
1172 }
1173
1174 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1175 case 1:
1176 break;
1177 case 0:
1178 if (!memcmp(dst_value, "refs/", 5))
1179 matched_dst = make_linked_ref(dst_value, dst_tail);
1180 else if (is_null_sha1(matched_src->new_sha1))
1181 error("unable to delete '%s': remote ref does not exist",
1182 dst_value);
1183 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1184 matched_dst = make_linked_ref(dst_guess, dst_tail);
1185 else
1186 error("unable to push to unqualified destination: %s\n"
1187 "The destination refspec neither matches an "
1188 "existing ref on the remote nor\n"
1189 "begins with refs/, and we are unable to "
1190 "guess a prefix based on the source ref.",
1191 dst_value);
1192 break;
1193 default:
1194 matched_dst = NULL;
1195 error("dst refspec %s matches more than one.",
1196 dst_value);
1197 break;
1198 }
1199 if (!matched_dst)
1200 return -1;
1201 if (matched_dst->peer_ref)
1202 return error("dst ref %s receives from more than one src.",
1203 matched_dst->name);
1204 else {
1205 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1206 matched_dst->force = rs->force;
1207 }
1208 return 0;
1209 }
1210
1211 static int match_explicit_refs(struct ref *src, struct ref *dst,
1212 struct ref ***dst_tail, struct refspec *rs,
1213 int rs_nr)
1214 {
1215 int i, errs;
1216 for (i = errs = 0; i < rs_nr; i++)
1217 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1218 return errs;
1219 }
1220
1221 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1222 int send_mirror, int direction, const struct refspec **ret_pat)
1223 {
1224 const struct refspec *pat;
1225 char *name;
1226 int i;
1227 int matching_refs = -1;
1228 for (i = 0; i < rs_nr; i++) {
1229 if (rs[i].matching &&
1230 (matching_refs == -1 || rs[i].force)) {
1231 matching_refs = i;
1232 continue;
1233 }
1234
1235 if (rs[i].pattern) {
1236 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1237 int match;
1238 if (direction == FROM_SRC)
1239 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1240 else
1241 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1242 if (match) {
1243 matching_refs = i;
1244 break;
1245 }
1246 }
1247 }
1248 if (matching_refs == -1)
1249 return NULL;
1250
1251 pat = rs + matching_refs;
1252 if (pat->matching) {
1253 /*
1254 * "matching refs"; traditionally we pushed everything
1255 * including refs outside refs/heads/ hierarchy, but
1256 * that does not make much sense these days.
1257 */
1258 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1259 return NULL;
1260 name = xstrdup(ref->name);
1261 }
1262 if (ret_pat)
1263 *ret_pat = pat;
1264 return name;
1265 }
1266
1267 static struct ref **tail_ref(struct ref **head)
1268 {
1269 struct ref **tail = head;
1270 while (*tail)
1271 tail = &((*tail)->next);
1272 return tail;
1273 }
1274
1275 struct tips {
1276 struct commit **tip;
1277 int nr, alloc;
1278 };
1279
1280 static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1281 {
1282 struct commit *commit;
1283
1284 if (is_null_sha1(sha1))
1285 return;
1286 commit = lookup_commit_reference_gently(sha1, 1);
1287 if (!commit || (commit->object.flags & TMP_MARK))
1288 return;
1289 commit->object.flags |= TMP_MARK;
1290 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1291 tips->tip[tips->nr++] = commit;
1292 }
1293
1294 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1295 {
1296 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1297 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1298 struct string_list_item *item;
1299 struct ref *ref;
1300 struct tips sent_tips;
1301
1302 /*
1303 * Collect everything we know they would have at the end of
1304 * this push, and collect all tags they have.
1305 */
1306 memset(&sent_tips, 0, sizeof(sent_tips));
1307 for (ref = *dst; ref; ref = ref->next) {
1308 if (ref->peer_ref &&
1309 !is_null_sha1(ref->peer_ref->new_sha1))
1310 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1311 else
1312 add_to_tips(&sent_tips, ref->old_sha1);
1313 if (starts_with(ref->name, "refs/tags/"))
1314 string_list_append(&dst_tag, ref->name);
1315 }
1316 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1317
1318 sort_string_list(&dst_tag);
1319
1320 /* Collect tags they do not have. */
1321 for (ref = src; ref; ref = ref->next) {
1322 if (!starts_with(ref->name, "refs/tags/"))
1323 continue; /* not a tag */
1324 if (string_list_has_string(&dst_tag, ref->name))
1325 continue; /* they already have it */
1326 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1327 continue; /* be conservative */
1328 item = string_list_append(&src_tag, ref->name);
1329 item->util = ref;
1330 }
1331 string_list_clear(&dst_tag, 0);
1332
1333 /*
1334 * At this point, src_tag lists tags that are missing from
1335 * dst, and sent_tips lists the tips we are pushing or those
1336 * that we know they already have. An element in the src_tag
1337 * that is an ancestor of any of the sent_tips needs to be
1338 * sent to the other side.
1339 */
1340 if (sent_tips.nr) {
1341 for_each_string_list_item(item, &src_tag) {
1342 struct ref *ref = item->util;
1343 struct ref *dst_ref;
1344 struct commit *commit;
1345
1346 if (is_null_sha1(ref->new_sha1))
1347 continue;
1348 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1349 if (!commit)
1350 /* not pushing a commit, which is not an error */
1351 continue;
1352
1353 /*
1354 * Is this tag, which they do not have, reachable from
1355 * any of the commits we are sending?
1356 */
1357 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1358 continue;
1359
1360 /* Add it in */
1361 dst_ref = make_linked_ref(ref->name, dst_tail);
1362 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1363 dst_ref->peer_ref = copy_ref(ref);
1364 }
1365 }
1366 string_list_clear(&src_tag, 0);
1367 free(sent_tips.tip);
1368 }
1369
1370 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1371 {
1372 for ( ; list; list = list->next)
1373 if (!strcmp(list->name, name))
1374 return (struct ref *)list;
1375 return NULL;
1376 }
1377
1378 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1379 {
1380 for ( ; ref; ref = ref->next)
1381 string_list_append_nodup(ref_index, ref->name)->util = ref;
1382
1383 sort_string_list(ref_index);
1384 }
1385
1386 /*
1387 * Given the set of refs the local repository has, the set of refs the
1388 * remote repository has, and the refspec used for push, determine
1389 * what remote refs we will update and with what value by setting
1390 * peer_ref (which object is being pushed) and force (if the push is
1391 * forced) in elements of "dst". The function may add new elements to
1392 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1393 */
1394 int match_push_refs(struct ref *src, struct ref **dst,
1395 int nr_refspec, const char **refspec, int flags)
1396 {
1397 struct refspec *rs;
1398 int send_all = flags & MATCH_REFS_ALL;
1399 int send_mirror = flags & MATCH_REFS_MIRROR;
1400 int send_prune = flags & MATCH_REFS_PRUNE;
1401 int errs;
1402 static const char *default_refspec[] = { ":", NULL };
1403 struct ref *ref, **dst_tail = tail_ref(dst);
1404 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1405
1406 if (!nr_refspec) {
1407 nr_refspec = 1;
1408 refspec = default_refspec;
1409 }
1410 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1411 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1412
1413 /* pick the remainder */
1414 for (ref = src; ref; ref = ref->next) {
1415 struct string_list_item *dst_item;
1416 struct ref *dst_peer;
1417 const struct refspec *pat = NULL;
1418 char *dst_name;
1419
1420 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1421 if (!dst_name)
1422 continue;
1423
1424 if (!dst_ref_index.nr)
1425 prepare_ref_index(&dst_ref_index, *dst);
1426
1427 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1428 dst_peer = dst_item ? dst_item->util : NULL;
1429 if (dst_peer) {
1430 if (dst_peer->peer_ref)
1431 /* We're already sending something to this ref. */
1432 goto free_name;
1433 } else {
1434 if (pat->matching && !(send_all || send_mirror))
1435 /*
1436 * Remote doesn't have it, and we have no
1437 * explicit pattern, and we don't have
1438 * --all or --mirror.
1439 */
1440 goto free_name;
1441
1442 /* Create a new one and link it */
1443 dst_peer = make_linked_ref(dst_name, &dst_tail);
1444 hashcpy(dst_peer->new_sha1, ref->new_sha1);
1445 string_list_insert(&dst_ref_index,
1446 dst_peer->name)->util = dst_peer;
1447 }
1448 dst_peer->peer_ref = copy_ref(ref);
1449 dst_peer->force = pat->force;
1450 free_name:
1451 free(dst_name);
1452 }
1453
1454 string_list_clear(&dst_ref_index, 0);
1455
1456 if (flags & MATCH_REFS_FOLLOW_TAGS)
1457 add_missing_tags(src, dst, &dst_tail);
1458
1459 if (send_prune) {
1460 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1461 /* check for missing refs on the remote */
1462 for (ref = *dst; ref; ref = ref->next) {
1463 char *src_name;
1464
1465 if (ref->peer_ref)
1466 /* We're already sending something to this ref. */
1467 continue;
1468
1469 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1470 if (src_name) {
1471 if (!src_ref_index.nr)
1472 prepare_ref_index(&src_ref_index, src);
1473 if (!string_list_has_string(&src_ref_index,
1474 src_name))
1475 ref->peer_ref = alloc_delete_ref();
1476 free(src_name);
1477 }
1478 }
1479 string_list_clear(&src_ref_index, 0);
1480 }
1481 if (errs)
1482 return -1;
1483 return 0;
1484 }
1485
1486 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1487 int force_update)
1488 {
1489 struct ref *ref;
1490
1491 for (ref = remote_refs; ref; ref = ref->next) {
1492 int force_ref_update = ref->force || force_update;
1493 int reject_reason = 0;
1494
1495 if (ref->peer_ref)
1496 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1497 else if (!send_mirror)
1498 continue;
1499
1500 ref->deletion = is_null_sha1(ref->new_sha1);
1501 if (!ref->deletion &&
1502 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1503 ref->status = REF_STATUS_UPTODATE;
1504 continue;
1505 }
1506
1507 /*
1508 * Bypass the usual "must fast-forward" check but
1509 * replace it with a weaker "the old value must be
1510 * this value we observed". If the remote ref has
1511 * moved and is now different from what we expect,
1512 * reject any push.
1513 *
1514 * It also is an error if the user told us to check
1515 * with the remote-tracking branch to find the value
1516 * to expect, but we did not have such a tracking
1517 * branch.
1518 */
1519 if (ref->expect_old_sha1) {
1520 if (ref->expect_old_no_trackback ||
1521 hashcmp(ref->old_sha1, ref->old_sha1_expect))
1522 reject_reason = REF_STATUS_REJECT_STALE;
1523 }
1524
1525 /*
1526 * The usual "must fast-forward" rules.
1527 *
1528 * Decide whether an individual refspec A:B can be
1529 * pushed. The push will succeed if any of the
1530 * following are true:
1531 *
1532 * (1) the remote reference B does not exist
1533 *
1534 * (2) the remote reference B is being removed (i.e.,
1535 * pushing :B where no source is specified)
1536 *
1537 * (3) the destination is not under refs/tags/, and
1538 * if the old and new value is a commit, the new
1539 * is a descendant of the old.
1540 *
1541 * (4) it is forced using the +A:B notation, or by
1542 * passing the --force argument
1543 */
1544
1545 else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1546 if (starts_with(ref->name, "refs/tags/"))
1547 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1548 else if (!has_sha1_file(ref->old_sha1))
1549 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1550 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1551 !lookup_commit_reference_gently(ref->new_sha1, 1))
1552 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1553 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1554 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1555 }
1556
1557 /*
1558 * "--force" will defeat any rejection implemented
1559 * by the rules above.
1560 */
1561 if (!force_ref_update)
1562 ref->status = reject_reason;
1563 else if (reject_reason)
1564 ref->forced_update = 1;
1565 }
1566 }
1567
1568 struct branch *branch_get(const char *name)
1569 {
1570 struct branch *ret;
1571
1572 read_config();
1573 if (!name || !*name || !strcmp(name, "HEAD"))
1574 ret = current_branch;
1575 else
1576 ret = make_branch(name, 0);
1577 if (ret && ret->remote_name) {
1578 ret->remote = remote_get(ret->remote_name);
1579 if (ret->merge_nr) {
1580 int i;
1581 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1582 for (i = 0; i < ret->merge_nr; i++) {
1583 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1584 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1585 if (remote_find_tracking(ret->remote, ret->merge[i])
1586 && !strcmp(ret->remote_name, "."))
1587 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1588 }
1589 }
1590 }
1591 return ret;
1592 }
1593
1594 int branch_has_merge_config(struct branch *branch)
1595 {
1596 return branch && !!branch->merge;
1597 }
1598
1599 int branch_merge_matches(struct branch *branch,
1600 int i,
1601 const char *refname)
1602 {
1603 if (!branch || i < 0 || i >= branch->merge_nr)
1604 return 0;
1605 return refname_match(branch->merge[i]->src, refname);
1606 }
1607
1608 static int ignore_symref_update(const char *refname)
1609 {
1610 unsigned char sha1[20];
1611 int flag;
1612
1613 if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1614 return 0; /* non-existing refs are OK */
1615 return (flag & REF_ISSYMREF);
1616 }
1617
1618 /*
1619 * Create and return a list of (struct ref) consisting of copies of
1620 * each remote_ref that matches refspec. refspec must be a pattern.
1621 * Fill in the copies' peer_ref to describe the local tracking refs to
1622 * which they map. Omit any references that would map to an existing
1623 * local symbolic ref.
1624 */
1625 static struct ref *get_expanded_map(const struct ref *remote_refs,
1626 const struct refspec *refspec)
1627 {
1628 const struct ref *ref;
1629 struct ref *ret = NULL;
1630 struct ref **tail = &ret;
1631
1632 for (ref = remote_refs; ref; ref = ref->next) {
1633 char *expn_name = NULL;
1634
1635 if (strchr(ref->name, '^'))
1636 continue; /* a dereference item */
1637 if (match_name_with_pattern(refspec->src, ref->name,
1638 refspec->dst, &expn_name) &&
1639 !ignore_symref_update(expn_name)) {
1640 struct ref *cpy = copy_ref(ref);
1641
1642 cpy->peer_ref = alloc_ref(expn_name);
1643 if (refspec->force)
1644 cpy->peer_ref->force = 1;
1645 *tail = cpy;
1646 tail = &cpy->next;
1647 }
1648 free(expn_name);
1649 }
1650
1651 return ret;
1652 }
1653
1654 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1655 {
1656 const struct ref *ref;
1657 for (ref = refs; ref; ref = ref->next) {
1658 if (refname_match(name, ref->name))
1659 return ref;
1660 }
1661 return NULL;
1662 }
1663
1664 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1665 {
1666 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1667
1668 if (!ref)
1669 return NULL;
1670
1671 return copy_ref(ref);
1672 }
1673
1674 static struct ref *get_local_ref(const char *name)
1675 {
1676 if (!name || name[0] == '\0')
1677 return NULL;
1678
1679 if (starts_with(name, "refs/"))
1680 return alloc_ref(name);
1681
1682 if (starts_with(name, "heads/") ||
1683 starts_with(name, "tags/") ||
1684 starts_with(name, "remotes/"))
1685 return alloc_ref_with_prefix("refs/", 5, name);
1686
1687 return alloc_ref_with_prefix("refs/heads/", 11, name);
1688 }
1689
1690 int get_fetch_map(const struct ref *remote_refs,
1691 const struct refspec *refspec,
1692 struct ref ***tail,
1693 int missing_ok)
1694 {
1695 struct ref *ref_map, **rmp;
1696
1697 if (refspec->pattern) {
1698 ref_map = get_expanded_map(remote_refs, refspec);
1699 } else {
1700 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1701
1702 if (refspec->exact_sha1) {
1703 ref_map = alloc_ref(name);
1704 get_sha1_hex(name, ref_map->old_sha1);
1705 } else {
1706 ref_map = get_remote_ref(remote_refs, name);
1707 }
1708 if (!missing_ok && !ref_map)
1709 die("Couldn't find remote ref %s", name);
1710 if (ref_map) {
1711 ref_map->peer_ref = get_local_ref(refspec->dst);
1712 if (ref_map->peer_ref && refspec->force)
1713 ref_map->peer_ref->force = 1;
1714 }
1715 }
1716
1717 for (rmp = &ref_map; *rmp; ) {
1718 if ((*rmp)->peer_ref) {
1719 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1720 check_refname_format((*rmp)->peer_ref->name, 0)) {
1721 struct ref *ignore = *rmp;
1722 error("* Ignoring funny ref '%s' locally",
1723 (*rmp)->peer_ref->name);
1724 *rmp = (*rmp)->next;
1725 free(ignore->peer_ref);
1726 free(ignore);
1727 continue;
1728 }
1729 }
1730 rmp = &((*rmp)->next);
1731 }
1732
1733 if (ref_map)
1734 tail_link_ref(ref_map, tail);
1735
1736 return 0;
1737 }
1738
1739 int resolve_remote_symref(struct ref *ref, struct ref *list)
1740 {
1741 if (!ref->symref)
1742 return 0;
1743 for (; list; list = list->next)
1744 if (!strcmp(ref->symref, list->name)) {
1745 hashcpy(ref->old_sha1, list->old_sha1);
1746 return 0;
1747 }
1748 return 1;
1749 }
1750
1751 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1752 {
1753 while (list) {
1754 struct commit_list *temp = list;
1755 temp->item->object.flags &= ~mark;
1756 list = temp->next;
1757 free(temp);
1758 }
1759 }
1760
1761 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1762 {
1763 struct object *o;
1764 struct commit *old, *new;
1765 struct commit_list *list, *used;
1766 int found = 0;
1767
1768 /*
1769 * Both new and old must be commit-ish and new is descendant of
1770 * old. Otherwise we require --force.
1771 */
1772 o = deref_tag(parse_object(old_sha1), NULL, 0);
1773 if (!o || o->type != OBJ_COMMIT)
1774 return 0;
1775 old = (struct commit *) o;
1776
1777 o = deref_tag(parse_object(new_sha1), NULL, 0);
1778 if (!o || o->type != OBJ_COMMIT)
1779 return 0;
1780 new = (struct commit *) o;
1781
1782 if (parse_commit(new) < 0)
1783 return 0;
1784
1785 used = list = NULL;
1786 commit_list_insert(new, &list);
1787 while (list) {
1788 new = pop_most_recent_commit(&list, TMP_MARK);
1789 commit_list_insert(new, &used);
1790 if (new == old) {
1791 found = 1;
1792 break;
1793 }
1794 }
1795 unmark_and_free(list, TMP_MARK);
1796 unmark_and_free(used, TMP_MARK);
1797 return found;
1798 }
1799
1800 /*
1801 * Compare a branch with its upstream, and save their differences (number
1802 * of commits) in *num_ours and *num_theirs.
1803 *
1804 * Return 0 if branch has no upstream (no base), -1 if upstream is missing
1805 * (with "gone" base), otherwise 1 (with base).
1806 */
1807 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1808 {
1809 unsigned char sha1[20];
1810 struct commit *ours, *theirs;
1811 char symmetric[84];
1812 struct rev_info revs;
1813 const char *rev_argv[10], *base;
1814 int rev_argc;
1815
1816 /* Cannot stat unless we are marked to build on top of somebody else. */
1817 if (!branch ||
1818 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1819 return 0;
1820
1821 /* Cannot stat if what we used to build on no longer exists */
1822 base = branch->merge[0]->dst;
1823 if (read_ref(base, sha1))
1824 return -1;
1825 theirs = lookup_commit_reference(sha1);
1826 if (!theirs)
1827 return -1;
1828
1829 if (read_ref(branch->refname, sha1))
1830 return -1;
1831 ours = lookup_commit_reference(sha1);
1832 if (!ours)
1833 return -1;
1834
1835 /* are we the same? */
1836 if (theirs == ours) {
1837 *num_theirs = *num_ours = 0;
1838 return 1;
1839 }
1840
1841 /* Run "rev-list --left-right ours...theirs" internally... */
1842 rev_argc = 0;
1843 rev_argv[rev_argc++] = NULL;
1844 rev_argv[rev_argc++] = "--left-right";
1845 rev_argv[rev_argc++] = symmetric;
1846 rev_argv[rev_argc++] = "--";
1847 rev_argv[rev_argc] = NULL;
1848
1849 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1850 strcpy(symmetric + 40, "...");
1851 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1852
1853 init_revisions(&revs, NULL);
1854 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1855 prepare_revision_walk(&revs);
1856
1857 /* ... and count the commits on each side. */
1858 *num_ours = 0;
1859 *num_theirs = 0;
1860 while (1) {
1861 struct commit *c = get_revision(&revs);
1862 if (!c)
1863 break;
1864 if (c->object.flags & SYMMETRIC_LEFT)
1865 (*num_ours)++;
1866 else
1867 (*num_theirs)++;
1868 }
1869
1870 /* clear object flags smudged by the above traversal */
1871 clear_commit_marks(ours, ALL_REV_FLAGS);
1872 clear_commit_marks(theirs, ALL_REV_FLAGS);
1873 return 1;
1874 }
1875
1876 /*
1877 * Return true when there is anything to report, otherwise false.
1878 */
1879 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1880 {
1881 int ours, theirs;
1882 const char *base;
1883 int upstream_is_gone = 0;
1884
1885 switch (stat_tracking_info(branch, &ours, &theirs)) {
1886 case 0:
1887 /* no base */
1888 return 0;
1889 case -1:
1890 /* with "gone" base */
1891 upstream_is_gone = 1;
1892 break;
1893 default:
1894 /* with base */
1895 break;
1896 }
1897
1898 base = branch->merge[0]->dst;
1899 base = shorten_unambiguous_ref(base, 0);
1900 if (upstream_is_gone) {
1901 strbuf_addf(sb,
1902 _("Your branch is based on '%s', but the upstream is gone.\n"),
1903 base);
1904 if (advice_status_hints)
1905 strbuf_addf(sb,
1906 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
1907 } else if (!ours && !theirs) {
1908 strbuf_addf(sb,
1909 _("Your branch is up-to-date with '%s'.\n"),
1910 base);
1911 } else if (!theirs) {
1912 strbuf_addf(sb,
1913 Q_("Your branch is ahead of '%s' by %d commit.\n",
1914 "Your branch is ahead of '%s' by %d commits.\n",
1915 ours),
1916 base, ours);
1917 if (advice_status_hints)
1918 strbuf_addf(sb,
1919 _(" (use \"git push\" to publish your local commits)\n"));
1920 } else if (!ours) {
1921 strbuf_addf(sb,
1922 Q_("Your branch is behind '%s' by %d commit, "
1923 "and can be fast-forwarded.\n",
1924 "Your branch is behind '%s' by %d commits, "
1925 "and can be fast-forwarded.\n",
1926 theirs),
1927 base, theirs);
1928 if (advice_status_hints)
1929 strbuf_addf(sb,
1930 _(" (use \"git pull\" to update your local branch)\n"));
1931 } else {
1932 strbuf_addf(sb,
1933 Q_("Your branch and '%s' have diverged,\n"
1934 "and have %d and %d different commit each, "
1935 "respectively.\n",
1936 "Your branch and '%s' have diverged,\n"
1937 "and have %d and %d different commits each, "
1938 "respectively.\n",
1939 theirs),
1940 base, ours, theirs);
1941 if (advice_status_hints)
1942 strbuf_addf(sb,
1943 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
1944 }
1945 return 1;
1946 }
1947
1948 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1949 {
1950 struct ref ***local_tail = cb_data;
1951 struct ref *ref;
1952 int len;
1953
1954 /* we already know it starts with refs/ to get here */
1955 if (check_refname_format(refname + 5, 0))
1956 return 0;
1957
1958 len = strlen(refname) + 1;
1959 ref = xcalloc(1, sizeof(*ref) + len);
1960 hashcpy(ref->new_sha1, sha1);
1961 memcpy(ref->name, refname, len);
1962 **local_tail = ref;
1963 *local_tail = &ref->next;
1964 return 0;
1965 }
1966
1967 struct ref *get_local_heads(void)
1968 {
1969 struct ref *local_refs = NULL, **local_tail = &local_refs;
1970 for_each_ref(one_local_ref, &local_tail);
1971 return local_refs;
1972 }
1973
1974 struct ref *guess_remote_head(const struct ref *head,
1975 const struct ref *refs,
1976 int all)
1977 {
1978 const struct ref *r;
1979 struct ref *list = NULL;
1980 struct ref **tail = &list;
1981
1982 if (!head)
1983 return NULL;
1984
1985 /*
1986 * Some transports support directly peeking at
1987 * where HEAD points; if that is the case, then
1988 * we don't have to guess.
1989 */
1990 if (head->symref)
1991 return copy_ref(find_ref_by_name(refs, head->symref));
1992
1993 /* If refs/heads/master could be right, it is. */
1994 if (!all) {
1995 r = find_ref_by_name(refs, "refs/heads/master");
1996 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1997 return copy_ref(r);
1998 }
1999
2000 /* Look for another ref that points there */
2001 for (r = refs; r; r = r->next) {
2002 if (r != head &&
2003 starts_with(r->name, "refs/heads/") &&
2004 !hashcmp(r->old_sha1, head->old_sha1)) {
2005 *tail = copy_ref(r);
2006 tail = &((*tail)->next);
2007 if (!all)
2008 break;
2009 }
2010 }
2011
2012 return list;
2013 }
2014
2015 struct stale_heads_info {
2016 struct string_list *ref_names;
2017 struct ref **stale_refs_tail;
2018 struct refspec *refs;
2019 int ref_count;
2020 };
2021
2022 static int get_stale_heads_cb(const char *refname,
2023 const unsigned char *sha1, int flags, void *cb_data)
2024 {
2025 struct stale_heads_info *info = cb_data;
2026 struct string_list matches = STRING_LIST_INIT_DUP;
2027 struct refspec query;
2028 int i, stale = 1;
2029 memset(&query, 0, sizeof(struct refspec));
2030 query.dst = (char *)refname;
2031
2032 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2033 if (matches.nr == 0)
2034 goto clean_exit; /* No matches */
2035
2036 /*
2037 * If we did find a suitable refspec and it's not a symref and
2038 * it's not in the list of refs that currently exist in that
2039 * remote, we consider it to be stale. In order to deal with
2040 * overlapping refspecs, we need to go over all of the
2041 * matching refs.
2042 */
2043 if (flags & REF_ISSYMREF)
2044 goto clean_exit;
2045
2046 for (i = 0; stale && i < matches.nr; i++)
2047 if (string_list_has_string(info->ref_names, matches.items[i].string))
2048 stale = 0;
2049
2050 if (stale) {
2051 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2052 hashcpy(ref->new_sha1, sha1);
2053 }
2054
2055 clean_exit:
2056 string_list_clear(&matches, 0);
2057 return 0;
2058 }
2059
2060 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2061 {
2062 struct ref *ref, *stale_refs = NULL;
2063 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2064 struct stale_heads_info info;
2065 info.ref_names = &ref_names;
2066 info.stale_refs_tail = &stale_refs;
2067 info.refs = refs;
2068 info.ref_count = ref_count;
2069 for (ref = fetch_map; ref; ref = ref->next)
2070 string_list_append(&ref_names, ref->name);
2071 sort_string_list(&ref_names);
2072 for_each_ref(get_stale_heads_cb, &info);
2073 string_list_clear(&ref_names, 0);
2074 return stale_refs;
2075 }
2076
2077 /*
2078 * Compare-and-swap
2079 */
2080 void clear_cas_option(struct push_cas_option *cas)
2081 {
2082 int i;
2083
2084 for (i = 0; i < cas->nr; i++)
2085 free(cas->entry[i].refname);
2086 free(cas->entry);
2087 memset(cas, 0, sizeof(*cas));
2088 }
2089
2090 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2091 const char *refname,
2092 size_t refnamelen)
2093 {
2094 struct push_cas *entry;
2095 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2096 entry = &cas->entry[cas->nr++];
2097 memset(entry, 0, sizeof(*entry));
2098 entry->refname = xmemdupz(refname, refnamelen);
2099 return entry;
2100 }
2101
2102 int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2103 {
2104 const char *colon;
2105 struct push_cas *entry;
2106
2107 if (unset) {
2108 /* "--no-<option>" */
2109 clear_cas_option(cas);
2110 return 0;
2111 }
2112
2113 if (!arg) {
2114 /* just "--<option>" */
2115 cas->use_tracking_for_rest = 1;
2116 return 0;
2117 }
2118
2119 /* "--<option>=refname" or "--<option>=refname:value" */
2120 colon = strchrnul(arg, ':');
2121 entry = add_cas_entry(cas, arg, colon - arg);
2122 if (!*colon)
2123 entry->use_tracking = 1;
2124 else if (get_sha1(colon + 1, entry->expect))
2125 return error("cannot parse expected object name '%s'", colon + 1);
2126 return 0;
2127 }
2128
2129 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2130 {
2131 return parse_push_cas_option(opt->value, arg, unset);
2132 }
2133
2134 int is_empty_cas(const struct push_cas_option *cas)
2135 {
2136 return !cas->use_tracking_for_rest && !cas->nr;
2137 }
2138
2139 /*
2140 * Look at remote.fetch refspec and see if we have a remote
2141 * tracking branch for the refname there. Fill its current
2142 * value in sha1[].
2143 * If we cannot do so, return negative to signal an error.
2144 */
2145 static int remote_tracking(struct remote *remote, const char *refname,
2146 unsigned char sha1[20])
2147 {
2148 char *dst;
2149
2150 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2151 if (!dst)
2152 return -1; /* no tracking ref for refname at remote */
2153 if (read_ref(dst, sha1))
2154 return -1; /* we know what the tracking ref is but we cannot read it */
2155 return 0;
2156 }
2157
2158 static void apply_cas(struct push_cas_option *cas,
2159 struct remote *remote,
2160 struct ref *ref)
2161 {
2162 int i;
2163
2164 /* Find an explicit --<option>=<name>[:<value>] entry */
2165 for (i = 0; i < cas->nr; i++) {
2166 struct push_cas *entry = &cas->entry[i];
2167 if (!refname_match(entry->refname, ref->name))
2168 continue;
2169 ref->expect_old_sha1 = 1;
2170 if (!entry->use_tracking)
2171 hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
2172 else if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2173 ref->expect_old_no_trackback = 1;
2174 return;
2175 }
2176
2177 /* Are we using "--<option>" to cover all? */
2178 if (!cas->use_tracking_for_rest)
2179 return;
2180
2181 ref->expect_old_sha1 = 1;
2182 if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2183 ref->expect_old_no_trackback = 1;
2184 }
2185
2186 void apply_push_cas(struct push_cas_option *cas,
2187 struct remote *remote,
2188 struct ref *remote_refs)
2189 {
2190 struct ref *ref;
2191 for (ref = remote_refs; ref; ref = ref->next)
2192 apply_cas(cas, remote, ref);
2193 }
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