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Merge branch 'jk/shallow-update-fix'
[git.git] / remote.c
blob21b096932e033f0ebff92fc2224a79a132256ad2
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 int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
861 {
862 int i;
863 int find_src = !query->src;
864 const char *needle = find_src ? query->dst : query->src;
865 char **result = find_src ? &query->src : &query->dst;
866
867 if (find_src && !query->dst)
868 return error("query_refspecs: need either src or dst");
869
870 for (i = 0; i < ref_count; i++) {
871 struct refspec *refspec = &refs[i];
872 const char *key = find_src ? refspec->dst : refspec->src;
873 const char *value = find_src ? refspec->src : refspec->dst;
874
875 if (!refspec->dst)
876 continue;
877 if (refspec->pattern) {
878 if (match_name_with_pattern(key, needle, value, result)) {
879 query->force = refspec->force;
880 return 0;
881 }
882 } else if (!strcmp(needle, key)) {
883 *result = xstrdup(value);
884 query->force = refspec->force;
885 return 0;
886 }
887 }
888 return -1;
889 }
890
891 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
892 const char *name)
893 {
894 struct refspec query;
895
896 memset(&query, 0, sizeof(struct refspec));
897 query.src = (char *)name;
898
899 if (query_refspecs(refspecs, nr_refspec, &query))
900 return NULL;
901
902 return query.dst;
903 }
904
905 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
906 {
907 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
908 }
909
910 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
911 const char *name)
912 {
913 size_t len = strlen(name);
914 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
915 memcpy(ref->name, prefix, prefixlen);
916 memcpy(ref->name + prefixlen, name, len);
917 return ref;
918 }
919
920 struct ref *alloc_ref(const char *name)
921 {
922 return alloc_ref_with_prefix("", 0, name);
923 }
924
925 struct ref *copy_ref(const struct ref *ref)
926 {
927 struct ref *cpy;
928 size_t len;
929 if (!ref)
930 return NULL;
931 len = strlen(ref->name);
932 cpy = xmalloc(sizeof(struct ref) + len + 1);
933 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
934 cpy->next = NULL;
935 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
936 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
937 cpy->peer_ref = copy_ref(ref->peer_ref);
938 return cpy;
939 }
940
941 struct ref *copy_ref_list(const struct ref *ref)
942 {
943 struct ref *ret = NULL;
944 struct ref **tail = &ret;
945 while (ref) {
946 *tail = copy_ref(ref);
947 ref = ref->next;
948 tail = &((*tail)->next);
949 }
950 return ret;
951 }
952
953 static void free_ref(struct ref *ref)
954 {
955 if (!ref)
956 return;
957 free_ref(ref->peer_ref);
958 free(ref->remote_status);
959 free(ref->symref);
960 free(ref);
961 }
962
963 void free_refs(struct ref *ref)
964 {
965 struct ref *next;
966 while (ref) {
967 next = ref->next;
968 free_ref(ref);
969 ref = next;
970 }
971 }
972
973 int ref_compare_name(const void *va, const void *vb)
974 {
975 const struct ref *a = va, *b = vb;
976 return strcmp(a->name, b->name);
977 }
978
979 static void *ref_list_get_next(const void *a)
980 {
981 return ((const struct ref *)a)->next;
982 }
983
984 static void ref_list_set_next(void *a, void *next)
985 {
986 ((struct ref *)a)->next = next;
987 }
988
989 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
990 {
991 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
992 }
993
994 int count_refspec_match(const char *pattern,
995 struct ref *refs,
996 struct ref **matched_ref)
997 {
998 int patlen = strlen(pattern);
999 struct ref *matched_weak = NULL;
1000 struct ref *matched = NULL;
1001 int weak_match = 0;
1002 int match = 0;
1003
1004 for (weak_match = match = 0; refs; refs = refs->next) {
1005 char *name = refs->name;
1006 int namelen = strlen(name);
1007
1008 if (!refname_match(pattern, name))
1009 continue;
1010
1011 /* A match is "weak" if it is with refs outside
1012 * heads or tags, and did not specify the pattern
1013 * in full (e.g. "refs/remotes/origin/master") or at
1014 * least from the toplevel (e.g. "remotes/origin/master");
1015 * otherwise "git push $URL master" would result in
1016 * ambiguity between remotes/origin/master and heads/master
1017 * at the remote site.
1018 */
1019 if (namelen != patlen &&
1020 patlen != namelen - 5 &&
1021 !starts_with(name, "refs/heads/") &&
1022 !starts_with(name, "refs/tags/")) {
1023 /* We want to catch the case where only weak
1024 * matches are found and there are multiple
1025 * matches, and where more than one strong
1026 * matches are found, as ambiguous. One
1027 * strong match with zero or more weak matches
1028 * are acceptable as a unique match.
1029 */
1030 matched_weak = refs;
1031 weak_match++;
1032 }
1033 else {
1034 matched = refs;
1035 match++;
1036 }
1037 }
1038 if (!matched) {
1039 if (matched_ref)
1040 *matched_ref = matched_weak;
1041 return weak_match;
1042 }
1043 else {
1044 if (matched_ref)
1045 *matched_ref = matched;
1046 return match;
1047 }
1048 }
1049
1050 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1051 {
1052 **tail = ref;
1053 while (ref->next)
1054 ref = ref->next;
1055 *tail = &ref->next;
1056 }
1057
1058 static struct ref *alloc_delete_ref(void)
1059 {
1060 struct ref *ref = alloc_ref("(delete)");
1061 hashclr(ref->new_sha1);
1062 return ref;
1063 }
1064
1065 static int try_explicit_object_name(const char *name,
1066 struct ref **match)
1067 {
1068 unsigned char sha1[20];
1069
1070 if (!*name) {
1071 if (match)
1072 *match = alloc_delete_ref();
1073 return 0;
1074 }
1075
1076 if (get_sha1(name, sha1))
1077 return -1;
1078
1079 if (match) {
1080 *match = alloc_ref(name);
1081 hashcpy((*match)->new_sha1, sha1);
1082 }
1083 return 0;
1084 }
1085
1086 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1087 {
1088 struct ref *ret = alloc_ref(name);
1089 tail_link_ref(ret, tail);
1090 return ret;
1091 }
1092
1093 static char *guess_ref(const char *name, struct ref *peer)
1094 {
1095 struct strbuf buf = STRBUF_INIT;
1096 unsigned char sha1[20];
1097
1098 const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1099 if (!r)
1100 return NULL;
1101
1102 if (starts_with(r, "refs/heads/"))
1103 strbuf_addstr(&buf, "refs/heads/");
1104 else if (starts_with(r, "refs/tags/"))
1105 strbuf_addstr(&buf, "refs/tags/");
1106 else
1107 return NULL;
1108
1109 strbuf_addstr(&buf, name);
1110 return strbuf_detach(&buf, NULL);
1111 }
1112
1113 static int match_explicit_lhs(struct ref *src,
1114 struct refspec *rs,
1115 struct ref **match,
1116 int *allocated_match)
1117 {
1118 switch (count_refspec_match(rs->src, src, match)) {
1119 case 1:
1120 if (allocated_match)
1121 *allocated_match = 0;
1122 return 0;
1123 case 0:
1124 /* The source could be in the get_sha1() format
1125 * not a reference name. :refs/other is a
1126 * way to delete 'other' ref at the remote end.
1127 */
1128 if (try_explicit_object_name(rs->src, match) < 0)
1129 return error("src refspec %s does not match any.", rs->src);
1130 if (allocated_match)
1131 *allocated_match = 1;
1132 return 0;
1133 default:
1134 return error("src refspec %s matches more than one.", rs->src);
1135 }
1136 }
1137
1138 static int match_explicit(struct ref *src, struct ref *dst,
1139 struct ref ***dst_tail,
1140 struct refspec *rs)
1141 {
1142 struct ref *matched_src, *matched_dst;
1143 int allocated_src;
1144
1145 const char *dst_value = rs->dst;
1146 char *dst_guess;
1147
1148 if (rs->pattern || rs->matching)
1149 return 0;
1150
1151 matched_src = matched_dst = NULL;
1152 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1153 return -1;
1154
1155 if (!dst_value) {
1156 unsigned char sha1[20];
1157 int flag;
1158
1159 dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1160 if (!dst_value ||
1161 ((flag & REF_ISSYMREF) &&
1162 !starts_with(dst_value, "refs/heads/")))
1163 die("%s cannot be resolved to branch.",
1164 matched_src->name);
1165 }
1166
1167 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1168 case 1:
1169 break;
1170 case 0:
1171 if (!memcmp(dst_value, "refs/", 5))
1172 matched_dst = make_linked_ref(dst_value, dst_tail);
1173 else if (is_null_sha1(matched_src->new_sha1))
1174 error("unable to delete '%s': remote ref does not exist",
1175 dst_value);
1176 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1177 matched_dst = make_linked_ref(dst_guess, dst_tail);
1178 else
1179 error("unable to push to unqualified destination: %s\n"
1180 "The destination refspec neither matches an "
1181 "existing ref on the remote nor\n"
1182 "begins with refs/, and we are unable to "
1183 "guess a prefix based on the source ref.",
1184 dst_value);
1185 break;
1186 default:
1187 matched_dst = NULL;
1188 error("dst refspec %s matches more than one.",
1189 dst_value);
1190 break;
1191 }
1192 if (!matched_dst)
1193 return -1;
1194 if (matched_dst->peer_ref)
1195 return error("dst ref %s receives from more than one src.",
1196 matched_dst->name);
1197 else {
1198 matched_dst->peer_ref = allocated_src ?
1199 matched_src :
1200 copy_ref(matched_src);
1201 matched_dst->force = rs->force;
1202 }
1203 return 0;
1204 }
1205
1206 static int match_explicit_refs(struct ref *src, struct ref *dst,
1207 struct ref ***dst_tail, struct refspec *rs,
1208 int rs_nr)
1209 {
1210 int i, errs;
1211 for (i = errs = 0; i < rs_nr; i++)
1212 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1213 return errs;
1214 }
1215
1216 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1217 int send_mirror, int direction, const struct refspec **ret_pat)
1218 {
1219 const struct refspec *pat;
1220 char *name;
1221 int i;
1222 int matching_refs = -1;
1223 for (i = 0; i < rs_nr; i++) {
1224 if (rs[i].matching &&
1225 (matching_refs == -1 || rs[i].force)) {
1226 matching_refs = i;
1227 continue;
1228 }
1229
1230 if (rs[i].pattern) {
1231 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1232 int match;
1233 if (direction == FROM_SRC)
1234 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1235 else
1236 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1237 if (match) {
1238 matching_refs = i;
1239 break;
1240 }
1241 }
1242 }
1243 if (matching_refs == -1)
1244 return NULL;
1245
1246 pat = rs + matching_refs;
1247 if (pat->matching) {
1248 /*
1249 * "matching refs"; traditionally we pushed everything
1250 * including refs outside refs/heads/ hierarchy, but
1251 * that does not make much sense these days.
1252 */
1253 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1254 return NULL;
1255 name = xstrdup(ref->name);
1256 }
1257 if (ret_pat)
1258 *ret_pat = pat;
1259 return name;
1260 }
1261
1262 static struct ref **tail_ref(struct ref **head)
1263 {
1264 struct ref **tail = head;
1265 while (*tail)
1266 tail = &((*tail)->next);
1267 return tail;
1268 }
1269
1270 struct tips {
1271 struct commit **tip;
1272 int nr, alloc;
1273 };
1274
1275 static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1276 {
1277 struct commit *commit;
1278
1279 if (is_null_sha1(sha1))
1280 return;
1281 commit = lookup_commit_reference_gently(sha1, 1);
1282 if (!commit || (commit->object.flags & TMP_MARK))
1283 return;
1284 commit->object.flags |= TMP_MARK;
1285 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1286 tips->tip[tips->nr++] = commit;
1287 }
1288
1289 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1290 {
1291 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1292 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1293 struct string_list_item *item;
1294 struct ref *ref;
1295 struct tips sent_tips;
1296
1297 /*
1298 * Collect everything we know they would have at the end of
1299 * this push, and collect all tags they have.
1300 */
1301 memset(&sent_tips, 0, sizeof(sent_tips));
1302 for (ref = *dst; ref; ref = ref->next) {
1303 if (ref->peer_ref &&
1304 !is_null_sha1(ref->peer_ref->new_sha1))
1305 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1306 else
1307 add_to_tips(&sent_tips, ref->old_sha1);
1308 if (starts_with(ref->name, "refs/tags/"))
1309 string_list_append(&dst_tag, ref->name);
1310 }
1311 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1312
1313 sort_string_list(&dst_tag);
1314
1315 /* Collect tags they do not have. */
1316 for (ref = src; ref; ref = ref->next) {
1317 if (!starts_with(ref->name, "refs/tags/"))
1318 continue; /* not a tag */
1319 if (string_list_has_string(&dst_tag, ref->name))
1320 continue; /* they already have it */
1321 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1322 continue; /* be conservative */
1323 item = string_list_append(&src_tag, ref->name);
1324 item->util = ref;
1325 }
1326 string_list_clear(&dst_tag, 0);
1327
1328 /*
1329 * At this point, src_tag lists tags that are missing from
1330 * dst, and sent_tips lists the tips we are pushing or those
1331 * that we know they already have. An element in the src_tag
1332 * that is an ancestor of any of the sent_tips needs to be
1333 * sent to the other side.
1334 */
1335 if (sent_tips.nr) {
1336 for_each_string_list_item(item, &src_tag) {
1337 struct ref *ref = item->util;
1338 struct ref *dst_ref;
1339 struct commit *commit;
1340
1341 if (is_null_sha1(ref->new_sha1))
1342 continue;
1343 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1344 if (!commit)
1345 /* not pushing a commit, which is not an error */
1346 continue;
1347
1348 /*
1349 * Is this tag, which they do not have, reachable from
1350 * any of the commits we are sending?
1351 */
1352 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1353 continue;
1354
1355 /* Add it in */
1356 dst_ref = make_linked_ref(ref->name, dst_tail);
1357 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1358 dst_ref->peer_ref = copy_ref(ref);
1359 }
1360 }
1361 string_list_clear(&src_tag, 0);
1362 free(sent_tips.tip);
1363 }
1364
1365 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1366 {
1367 for ( ; list; list = list->next)
1368 if (!strcmp(list->name, name))
1369 return (struct ref *)list;
1370 return NULL;
1371 }
1372
1373 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1374 {
1375 for ( ; ref; ref = ref->next)
1376 string_list_append_nodup(ref_index, ref->name)->util = ref;
1377
1378 sort_string_list(ref_index);
1379 }
1380
1381 /*
1382 * Given only the set of local refs, sanity-check the set of push
1383 * refspecs. We can't catch all errors that match_push_refs would,
1384 * but we can catch some errors early before even talking to the
1385 * remote side.
1386 */
1387 int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1388 {
1389 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1390 int ret = 0;
1391 int i;
1392
1393 for (i = 0; i < nr_refspec; i++) {
1394 struct refspec *rs = refspec + i;
1395
1396 if (rs->pattern || rs->matching)
1397 continue;
1398
1399 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1400 }
1401
1402 free_refspec(nr_refspec, refspec);
1403 return ret;
1404 }
1405
1406 /*
1407 * Given the set of refs the local repository has, the set of refs the
1408 * remote repository has, and the refspec used for push, determine
1409 * what remote refs we will update and with what value by setting
1410 * peer_ref (which object is being pushed) and force (if the push is
1411 * forced) in elements of "dst". The function may add new elements to
1412 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1413 */
1414 int match_push_refs(struct ref *src, struct ref **dst,
1415 int nr_refspec, const char **refspec, int flags)
1416 {
1417 struct refspec *rs;
1418 int send_all = flags & MATCH_REFS_ALL;
1419 int send_mirror = flags & MATCH_REFS_MIRROR;
1420 int send_prune = flags & MATCH_REFS_PRUNE;
1421 int errs;
1422 static const char *default_refspec[] = { ":", NULL };
1423 struct ref *ref, **dst_tail = tail_ref(dst);
1424 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1425
1426 if (!nr_refspec) {
1427 nr_refspec = 1;
1428 refspec = default_refspec;
1429 }
1430 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1431 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1432
1433 /* pick the remainder */
1434 for (ref = src; ref; ref = ref->next) {
1435 struct string_list_item *dst_item;
1436 struct ref *dst_peer;
1437 const struct refspec *pat = NULL;
1438 char *dst_name;
1439
1440 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1441 if (!dst_name)
1442 continue;
1443
1444 if (!dst_ref_index.nr)
1445 prepare_ref_index(&dst_ref_index, *dst);
1446
1447 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1448 dst_peer = dst_item ? dst_item->util : NULL;
1449 if (dst_peer) {
1450 if (dst_peer->peer_ref)
1451 /* We're already sending something to this ref. */
1452 goto free_name;
1453 } else {
1454 if (pat->matching && !(send_all || send_mirror))
1455 /*
1456 * Remote doesn't have it, and we have no
1457 * explicit pattern, and we don't have
1458 * --all nor --mirror.
1459 */
1460 goto free_name;
1461
1462 /* Create a new one and link it */
1463 dst_peer = make_linked_ref(dst_name, &dst_tail);
1464 hashcpy(dst_peer->new_sha1, ref->new_sha1);
1465 string_list_insert(&dst_ref_index,
1466 dst_peer->name)->util = dst_peer;
1467 }
1468 dst_peer->peer_ref = copy_ref(ref);
1469 dst_peer->force = pat->force;
1470 free_name:
1471 free(dst_name);
1472 }
1473
1474 string_list_clear(&dst_ref_index, 0);
1475
1476 if (flags & MATCH_REFS_FOLLOW_TAGS)
1477 add_missing_tags(src, dst, &dst_tail);
1478
1479 if (send_prune) {
1480 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1481 /* check for missing refs on the remote */
1482 for (ref = *dst; ref; ref = ref->next) {
1483 char *src_name;
1484
1485 if (ref->peer_ref)
1486 /* We're already sending something to this ref. */
1487 continue;
1488
1489 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1490 if (src_name) {
1491 if (!src_ref_index.nr)
1492 prepare_ref_index(&src_ref_index, src);
1493 if (!string_list_has_string(&src_ref_index,
1494 src_name))
1495 ref->peer_ref = alloc_delete_ref();
1496 free(src_name);
1497 }
1498 }
1499 string_list_clear(&src_ref_index, 0);
1500 }
1501 if (errs)
1502 return -1;
1503 return 0;
1504 }
1505
1506 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1507 int force_update)
1508 {
1509 struct ref *ref;
1510
1511 for (ref = remote_refs; ref; ref = ref->next) {
1512 int force_ref_update = ref->force || force_update;
1513 int reject_reason = 0;
1514
1515 if (ref->peer_ref)
1516 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1517 else if (!send_mirror)
1518 continue;
1519
1520 ref->deletion = is_null_sha1(ref->new_sha1);
1521 if (!ref->deletion &&
1522 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1523 ref->status = REF_STATUS_UPTODATE;
1524 continue;
1525 }
1526
1527 /*
1528 * Bypass the usual "must fast-forward" check but
1529 * replace it with a weaker "the old value must be
1530 * this value we observed". If the remote ref has
1531 * moved and is now different from what we expect,
1532 * reject any push.
1533 *
1534 * It also is an error if the user told us to check
1535 * with the remote-tracking branch to find the value
1536 * to expect, but we did not have such a tracking
1537 * branch.
1538 */
1539 if (ref->expect_old_sha1) {
1540 if (ref->expect_old_no_trackback ||
1541 hashcmp(ref->old_sha1, ref->old_sha1_expect))
1542 reject_reason = REF_STATUS_REJECT_STALE;
1543 }
1544
1545 /*
1546 * The usual "must fast-forward" rules.
1547 *
1548 * Decide whether an individual refspec A:B can be
1549 * pushed. The push will succeed if any of the
1550 * following are true:
1551 *
1552 * (1) the remote reference B does not exist
1553 *
1554 * (2) the remote reference B is being removed (i.e.,
1555 * pushing :B where no source is specified)
1556 *
1557 * (3) the destination is not under refs/tags/, and
1558 * if the old and new value is a commit, the new
1559 * is a descendant of the old.
1560 *
1561 * (4) it is forced using the +A:B notation, or by
1562 * passing the --force argument
1563 */
1564
1565 else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1566 if (starts_with(ref->name, "refs/tags/"))
1567 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1568 else if (!has_sha1_file(ref->old_sha1))
1569 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1570 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1571 !lookup_commit_reference_gently(ref->new_sha1, 1))
1572 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1573 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1574 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1575 }
1576
1577 /*
1578 * "--force" will defeat any rejection implemented
1579 * by the rules above.
1580 */
1581 if (!force_ref_update)
1582 ref->status = reject_reason;
1583 else if (reject_reason)
1584 ref->forced_update = 1;
1585 }
1586 }
1587
1588 struct branch *branch_get(const char *name)
1589 {
1590 struct branch *ret;
1591
1592 read_config();
1593 if (!name || !*name || !strcmp(name, "HEAD"))
1594 ret = current_branch;
1595 else
1596 ret = make_branch(name, 0);
1597 if (ret && ret->remote_name) {
1598 ret->remote = remote_get(ret->remote_name);
1599 if (ret->merge_nr) {
1600 int i;
1601 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1602 for (i = 0; i < ret->merge_nr; i++) {
1603 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1604 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1605 if (remote_find_tracking(ret->remote, ret->merge[i])
1606 && !strcmp(ret->remote_name, "."))
1607 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1608 }
1609 }
1610 }
1611 return ret;
1612 }
1613
1614 int branch_has_merge_config(struct branch *branch)
1615 {
1616 return branch && !!branch->merge;
1617 }
1618
1619 int branch_merge_matches(struct branch *branch,
1620 int i,
1621 const char *refname)
1622 {
1623 if (!branch || i < 0 || i >= branch->merge_nr)
1624 return 0;
1625 return refname_match(branch->merge[i]->src, refname);
1626 }
1627
1628 static int ignore_symref_update(const char *refname)
1629 {
1630 unsigned char sha1[20];
1631 int flag;
1632
1633 if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1634 return 0; /* non-existing refs are OK */
1635 return (flag & REF_ISSYMREF);
1636 }
1637
1638 /*
1639 * Create and return a list of (struct ref) consisting of copies of
1640 * each remote_ref that matches refspec. refspec must be a pattern.
1641 * Fill in the copies' peer_ref to describe the local tracking refs to
1642 * which they map. Omit any references that would map to an existing
1643 * local symbolic ref.
1644 */
1645 static struct ref *get_expanded_map(const struct ref *remote_refs,
1646 const struct refspec *refspec)
1647 {
1648 const struct ref *ref;
1649 struct ref *ret = NULL;
1650 struct ref **tail = &ret;
1651
1652 for (ref = remote_refs; ref; ref = ref->next) {
1653 char *expn_name = NULL;
1654
1655 if (strchr(ref->name, '^'))
1656 continue; /* a dereference item */
1657 if (match_name_with_pattern(refspec->src, ref->name,
1658 refspec->dst, &expn_name) &&
1659 !ignore_symref_update(expn_name)) {
1660 struct ref *cpy = copy_ref(ref);
1661
1662 cpy->peer_ref = alloc_ref(expn_name);
1663 if (refspec->force)
1664 cpy->peer_ref->force = 1;
1665 *tail = cpy;
1666 tail = &cpy->next;
1667 }
1668 free(expn_name);
1669 }
1670
1671 return ret;
1672 }
1673
1674 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1675 {
1676 const struct ref *ref;
1677 for (ref = refs; ref; ref = ref->next) {
1678 if (refname_match(name, ref->name))
1679 return ref;
1680 }
1681 return NULL;
1682 }
1683
1684 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1685 {
1686 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1687
1688 if (!ref)
1689 return NULL;
1690
1691 return copy_ref(ref);
1692 }
1693
1694 static struct ref *get_local_ref(const char *name)
1695 {
1696 if (!name || name[0] == '\0')
1697 return NULL;
1698
1699 if (starts_with(name, "refs/"))
1700 return alloc_ref(name);
1701
1702 if (starts_with(name, "heads/") ||
1703 starts_with(name, "tags/") ||
1704 starts_with(name, "remotes/"))
1705 return alloc_ref_with_prefix("refs/", 5, name);
1706
1707 return alloc_ref_with_prefix("refs/heads/", 11, name);
1708 }
1709
1710 int get_fetch_map(const struct ref *remote_refs,
1711 const struct refspec *refspec,
1712 struct ref ***tail,
1713 int missing_ok)
1714 {
1715 struct ref *ref_map, **rmp;
1716
1717 if (refspec->pattern) {
1718 ref_map = get_expanded_map(remote_refs, refspec);
1719 } else {
1720 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1721
1722 if (refspec->exact_sha1) {
1723 ref_map = alloc_ref(name);
1724 get_sha1_hex(name, ref_map->old_sha1);
1725 } else {
1726 ref_map = get_remote_ref(remote_refs, name);
1727 }
1728 if (!missing_ok && !ref_map)
1729 die("Couldn't find remote ref %s", name);
1730 if (ref_map) {
1731 ref_map->peer_ref = get_local_ref(refspec->dst);
1732 if (ref_map->peer_ref && refspec->force)
1733 ref_map->peer_ref->force = 1;
1734 }
1735 }
1736
1737 for (rmp = &ref_map; *rmp; ) {
1738 if ((*rmp)->peer_ref) {
1739 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1740 check_refname_format((*rmp)->peer_ref->name, 0)) {
1741 struct ref *ignore = *rmp;
1742 error("* Ignoring funny ref '%s' locally",
1743 (*rmp)->peer_ref->name);
1744 *rmp = (*rmp)->next;
1745 free(ignore->peer_ref);
1746 free(ignore);
1747 continue;
1748 }
1749 }
1750 rmp = &((*rmp)->next);
1751 }
1752
1753 if (ref_map)
1754 tail_link_ref(ref_map, tail);
1755
1756 return 0;
1757 }
1758
1759 int resolve_remote_symref(struct ref *ref, struct ref *list)
1760 {
1761 if (!ref->symref)
1762 return 0;
1763 for (; list; list = list->next)
1764 if (!strcmp(ref->symref, list->name)) {
1765 hashcpy(ref->old_sha1, list->old_sha1);
1766 return 0;
1767 }
1768 return 1;
1769 }
1770
1771 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1772 {
1773 while (list) {
1774 struct commit_list *temp = list;
1775 temp->item->object.flags &= ~mark;
1776 list = temp->next;
1777 free(temp);
1778 }
1779 }
1780
1781 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1782 {
1783 struct object *o;
1784 struct commit *old, *new;
1785 struct commit_list *list, *used;
1786 int found = 0;
1787
1788 /*
1789 * Both new and old must be commit-ish and new is descendant of
1790 * old. Otherwise we require --force.
1791 */
1792 o = deref_tag(parse_object(old_sha1), NULL, 0);
1793 if (!o || o->type != OBJ_COMMIT)
1794 return 0;
1795 old = (struct commit *) o;
1796
1797 o = deref_tag(parse_object(new_sha1), NULL, 0);
1798 if (!o || o->type != OBJ_COMMIT)
1799 return 0;
1800 new = (struct commit *) o;
1801
1802 if (parse_commit(new) < 0)
1803 return 0;
1804
1805 used = list = NULL;
1806 commit_list_insert(new, &list);
1807 while (list) {
1808 new = pop_most_recent_commit(&list, TMP_MARK);
1809 commit_list_insert(new, &used);
1810 if (new == old) {
1811 found = 1;
1812 break;
1813 }
1814 }
1815 unmark_and_free(list, TMP_MARK);
1816 unmark_and_free(used, TMP_MARK);
1817 return found;
1818 }
1819
1820 /*
1821 * Compare a branch with its upstream, and save their differences (number
1822 * of commits) in *num_ours and *num_theirs.
1823 *
1824 * Return 0 if branch has no upstream (no base), -1 if upstream is missing
1825 * (with "gone" base), otherwise 1 (with base).
1826 */
1827 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1828 {
1829 unsigned char sha1[20];
1830 struct commit *ours, *theirs;
1831 char symmetric[84];
1832 struct rev_info revs;
1833 const char *rev_argv[10], *base;
1834 int rev_argc;
1835
1836 /* Cannot stat unless we are marked to build on top of somebody else. */
1837 if (!branch ||
1838 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1839 return 0;
1840
1841 /* Cannot stat if what we used to build on no longer exists */
1842 base = branch->merge[0]->dst;
1843 if (read_ref(base, sha1))
1844 return -1;
1845 theirs = lookup_commit_reference(sha1);
1846 if (!theirs)
1847 return -1;
1848
1849 if (read_ref(branch->refname, sha1))
1850 return -1;
1851 ours = lookup_commit_reference(sha1);
1852 if (!ours)
1853 return -1;
1854
1855 /* are we the same? */
1856 if (theirs == ours) {
1857 *num_theirs = *num_ours = 0;
1858 return 1;
1859 }
1860
1861 /* Run "rev-list --left-right ours...theirs" internally... */
1862 rev_argc = 0;
1863 rev_argv[rev_argc++] = NULL;
1864 rev_argv[rev_argc++] = "--left-right";
1865 rev_argv[rev_argc++] = symmetric;
1866 rev_argv[rev_argc++] = "--";
1867 rev_argv[rev_argc] = NULL;
1868
1869 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1870 strcpy(symmetric + 40, "...");
1871 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1872
1873 init_revisions(&revs, NULL);
1874 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1875 prepare_revision_walk(&revs);
1876
1877 /* ... and count the commits on each side. */
1878 *num_ours = 0;
1879 *num_theirs = 0;
1880 while (1) {
1881 struct commit *c = get_revision(&revs);
1882 if (!c)
1883 break;
1884 if (c->object.flags & SYMMETRIC_LEFT)
1885 (*num_ours)++;
1886 else
1887 (*num_theirs)++;
1888 }
1889
1890 /* clear object flags smudged by the above traversal */
1891 clear_commit_marks(ours, ALL_REV_FLAGS);
1892 clear_commit_marks(theirs, ALL_REV_FLAGS);
1893 return 1;
1894 }
1895
1896 /*
1897 * Return true when there is anything to report, otherwise false.
1898 */
1899 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1900 {
1901 int ours, theirs;
1902 const char *base;
1903 int upstream_is_gone = 0;
1904
1905 switch (stat_tracking_info(branch, &ours, &theirs)) {
1906 case 0:
1907 /* no base */
1908 return 0;
1909 case -1:
1910 /* with "gone" base */
1911 upstream_is_gone = 1;
1912 break;
1913 default:
1914 /* with base */
1915 break;
1916 }
1917
1918 base = branch->merge[0]->dst;
1919 base = shorten_unambiguous_ref(base, 0);
1920 if (upstream_is_gone) {
1921 strbuf_addf(sb,
1922 _("Your branch is based on '%s', but the upstream is gone.\n"),
1923 base);
1924 if (advice_status_hints)
1925 strbuf_addf(sb,
1926 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
1927 } else if (!ours && !theirs) {
1928 strbuf_addf(sb,
1929 _("Your branch is up-to-date with '%s'.\n"),
1930 base);
1931 } else if (!theirs) {
1932 strbuf_addf(sb,
1933 Q_("Your branch is ahead of '%s' by %d commit.\n",
1934 "Your branch is ahead of '%s' by %d commits.\n",
1935 ours),
1936 base, ours);
1937 if (advice_status_hints)
1938 strbuf_addf(sb,
1939 _(" (use \"git push\" to publish your local commits)\n"));
1940 } else if (!ours) {
1941 strbuf_addf(sb,
1942 Q_("Your branch is behind '%s' by %d commit, "
1943 "and can be fast-forwarded.\n",
1944 "Your branch is behind '%s' by %d commits, "
1945 "and can be fast-forwarded.\n",
1946 theirs),
1947 base, theirs);
1948 if (advice_status_hints)
1949 strbuf_addf(sb,
1950 _(" (use \"git pull\" to update your local branch)\n"));
1951 } else {
1952 strbuf_addf(sb,
1953 Q_("Your branch and '%s' have diverged,\n"
1954 "and have %d and %d different commit each, "
1955 "respectively.\n",
1956 "Your branch and '%s' have diverged,\n"
1957 "and have %d and %d different commits each, "
1958 "respectively.\n",
1959 theirs),
1960 base, ours, theirs);
1961 if (advice_status_hints)
1962 strbuf_addf(sb,
1963 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
1964 }
1965 return 1;
1966 }
1967
1968 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1969 {
1970 struct ref ***local_tail = cb_data;
1971 struct ref *ref;
1972 int len;
1973
1974 /* we already know it starts with refs/ to get here */
1975 if (check_refname_format(refname + 5, 0))
1976 return 0;
1977
1978 len = strlen(refname) + 1;
1979 ref = xcalloc(1, sizeof(*ref) + len);
1980 hashcpy(ref->new_sha1, sha1);
1981 memcpy(ref->name, refname, len);
1982 **local_tail = ref;
1983 *local_tail = &ref->next;
1984 return 0;
1985 }
1986
1987 struct ref *get_local_heads(void)
1988 {
1989 struct ref *local_refs = NULL, **local_tail = &local_refs;
1990 for_each_ref(one_local_ref, &local_tail);
1991 return local_refs;
1992 }
1993
1994 struct ref *guess_remote_head(const struct ref *head,
1995 const struct ref *refs,
1996 int all)
1997 {
1998 const struct ref *r;
1999 struct ref *list = NULL;
2000 struct ref **tail = &list;
2001
2002 if (!head)
2003 return NULL;
2004
2005 /*
2006 * Some transports support directly peeking at
2007 * where HEAD points; if that is the case, then
2008 * we don't have to guess.
2009 */
2010 if (head->symref)
2011 return copy_ref(find_ref_by_name(refs, head->symref));
2012
2013 /* If refs/heads/master could be right, it is. */
2014 if (!all) {
2015 r = find_ref_by_name(refs, "refs/heads/master");
2016 if (r && !hashcmp(r->old_sha1, head->old_sha1))
2017 return copy_ref(r);
2018 }
2019
2020 /* Look for another ref that points there */
2021 for (r = refs; r; r = r->next) {
2022 if (r != head &&
2023 starts_with(r->name, "refs/heads/") &&
2024 !hashcmp(r->old_sha1, head->old_sha1)) {
2025 *tail = copy_ref(r);
2026 tail = &((*tail)->next);
2027 if (!all)
2028 break;
2029 }
2030 }
2031
2032 return list;
2033 }
2034
2035 struct stale_heads_info {
2036 struct string_list *ref_names;
2037 struct ref **stale_refs_tail;
2038 struct refspec *refs;
2039 int ref_count;
2040 };
2041
2042 static int get_stale_heads_cb(const char *refname,
2043 const unsigned char *sha1, int flags, void *cb_data)
2044 {
2045 struct stale_heads_info *info = cb_data;
2046 struct refspec query;
2047 memset(&query, 0, sizeof(struct refspec));
2048 query.dst = (char *)refname;
2049
2050 if (query_refspecs(info->refs, info->ref_count, &query))
2051 return 0; /* No matches */
2052
2053 /*
2054 * If we did find a suitable refspec and it's not a symref and
2055 * it's not in the list of refs that currently exist in that
2056 * remote we consider it to be stale.
2057 */
2058 if (!((flags & REF_ISSYMREF) ||
2059 string_list_has_string(info->ref_names, query.src))) {
2060 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2061 hashcpy(ref->new_sha1, sha1);
2062 }
2063
2064 free(query.src);
2065 return 0;
2066 }
2067
2068 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2069 {
2070 struct ref *ref, *stale_refs = NULL;
2071 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2072 struct stale_heads_info info;
2073 info.ref_names = &ref_names;
2074 info.stale_refs_tail = &stale_refs;
2075 info.refs = refs;
2076 info.ref_count = ref_count;
2077 for (ref = fetch_map; ref; ref = ref->next)
2078 string_list_append(&ref_names, ref->name);
2079 sort_string_list(&ref_names);
2080 for_each_ref(get_stale_heads_cb, &info);
2081 string_list_clear(&ref_names, 0);
2082 return stale_refs;
2083 }
2084
2085 /*
2086 * Compare-and-swap
2087 */
2088 void clear_cas_option(struct push_cas_option *cas)
2089 {
2090 int i;
2091
2092 for (i = 0; i < cas->nr; i++)
2093 free(cas->entry[i].refname);
2094 free(cas->entry);
2095 memset(cas, 0, sizeof(*cas));
2096 }
2097
2098 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2099 const char *refname,
2100 size_t refnamelen)
2101 {
2102 struct push_cas *entry;
2103 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2104 entry = &cas->entry[cas->nr++];
2105 memset(entry, 0, sizeof(*entry));
2106 entry->refname = xmemdupz(refname, refnamelen);
2107 return entry;
2108 }
2109
2110 int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2111 {
2112 const char *colon;
2113 struct push_cas *entry;
2114
2115 if (unset) {
2116 /* "--no-<option>" */
2117 clear_cas_option(cas);
2118 return 0;
2119 }
2120
2121 if (!arg) {
2122 /* just "--<option>" */
2123 cas->use_tracking_for_rest = 1;
2124 return 0;
2125 }
2126
2127 /* "--<option>=refname" or "--<option>=refname:value" */
2128 colon = strchrnul(arg, ':');
2129 entry = add_cas_entry(cas, arg, colon - arg);
2130 if (!*colon)
2131 entry->use_tracking = 1;
2132 else if (get_sha1(colon + 1, entry->expect))
2133 return error("cannot parse expected object name '%s'", colon + 1);
2134 return 0;
2135 }
2136
2137 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2138 {
2139 return parse_push_cas_option(opt->value, arg, unset);
2140 }
2141
2142 int is_empty_cas(const struct push_cas_option *cas)
2143 {
2144 return !cas->use_tracking_for_rest && !cas->nr;
2145 }
2146
2147 /*
2148 * Look at remote.fetch refspec and see if we have a remote
2149 * tracking branch for the refname there. Fill its current
2150 * value in sha1[].
2151 * If we cannot do so, return negative to signal an error.
2152 */
2153 static int remote_tracking(struct remote *remote, const char *refname,
2154 unsigned char sha1[20])
2155 {
2156 char *dst;
2157
2158 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2159 if (!dst)
2160 return -1; /* no tracking ref for refname at remote */
2161 if (read_ref(dst, sha1))
2162 return -1; /* we know what the tracking ref is but we cannot read it */
2163 return 0;
2164 }
2165
2166 static void apply_cas(struct push_cas_option *cas,
2167 struct remote *remote,
2168 struct ref *ref)
2169 {
2170 int i;
2171
2172 /* Find an explicit --<option>=<name>[:<value>] entry */
2173 for (i = 0; i < cas->nr; i++) {
2174 struct push_cas *entry = &cas->entry[i];
2175 if (!refname_match(entry->refname, ref->name))
2176 continue;
2177 ref->expect_old_sha1 = 1;
2178 if (!entry->use_tracking)
2179 hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
2180 else if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2181 ref->expect_old_no_trackback = 1;
2182 return;
2183 }
2184
2185 /* Are we using "--<option>" to cover all? */
2186 if (!cas->use_tracking_for_rest)
2187 return;
2188
2189 ref->expect_old_sha1 = 1;
2190 if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2191 ref->expect_old_no_trackback = 1;
2192 }
2193
2194 void apply_push_cas(struct push_cas_option *cas,
2195 struct remote *remote,
2196 struct ref *remote_refs)
2197 {
2198 struct ref *ref;
2199 for (ref = remote_refs; ref; ref = ref->next)
2200 apply_cas(cas, remote, ref);
2201 }
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