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name-hash: stop storing trailing '/' on paths in index_state.dir_hash
[alt-git.git] / remote.c
blob24334679e0971e3af5e168d1cf7259da55d21d50
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 *pushremote_name;
53 static int explicit_default_remote_name;
54
55 static struct rewrites rewrites;
56 static struct rewrites rewrites_push;
57
58 #define BUF_SIZE (2048)
59 static char buffer[BUF_SIZE];
60
61 static int valid_remote(const struct remote *remote)
62 {
63 return (!!remote->url) || (!!remote->foreign_vcs);
64 }
65
66 static const char *alias_url(const char *url, struct rewrites *r)
67 {
68 int i, j;
69 char *ret;
70 struct counted_string *longest;
71 int longest_i;
72
73 longest = NULL;
74 longest_i = -1;
75 for (i = 0; i < r->rewrite_nr; i++) {
76 if (!r->rewrite[i])
77 continue;
78 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
79 if (!prefixcmp(url, r->rewrite[i]->instead_of[j].s) &&
80 (!longest ||
81 longest->len < r->rewrite[i]->instead_of[j].len)) {
82 longest = &(r->rewrite[i]->instead_of[j]);
83 longest_i = i;
84 }
85 }
86 }
87 if (!longest)
88 return url;
89
90 ret = xmalloc(r->rewrite[longest_i]->baselen +
91 (strlen(url) - longest->len) + 1);
92 strcpy(ret, r->rewrite[longest_i]->base);
93 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
94 return ret;
95 }
96
97 static void add_push_refspec(struct remote *remote, const char *ref)
98 {
99 ALLOC_GROW(remote->push_refspec,
100 remote->push_refspec_nr + 1,
101 remote->push_refspec_alloc);
102 remote->push_refspec[remote->push_refspec_nr++] = ref;
103 }
104
105 static void add_fetch_refspec(struct remote *remote, const char *ref)
106 {
107 ALLOC_GROW(remote->fetch_refspec,
108 remote->fetch_refspec_nr + 1,
109 remote->fetch_refspec_alloc);
110 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
111 }
112
113 static void add_url(struct remote *remote, const char *url)
114 {
115 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
116 remote->url[remote->url_nr++] = url;
117 }
118
119 static void add_pushurl(struct remote *remote, const char *pushurl)
120 {
121 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
122 remote->pushurl[remote->pushurl_nr++] = pushurl;
123 }
124
125 static void add_pushurl_alias(struct remote *remote, const char *url)
126 {
127 const char *pushurl = alias_url(url, &rewrites_push);
128 if (pushurl != url)
129 add_pushurl(remote, pushurl);
130 }
131
132 static void add_url_alias(struct remote *remote, const char *url)
133 {
134 add_url(remote, alias_url(url, &rewrites));
135 add_pushurl_alias(remote, url);
136 }
137
138 static struct remote *make_remote(const char *name, int len)
139 {
140 struct remote *ret;
141 int i;
142
143 for (i = 0; i < remotes_nr; i++) {
144 if (len ? (!strncmp(name, remotes[i]->name, len) &&
145 !remotes[i]->name[len]) :
146 !strcmp(name, remotes[i]->name))
147 return remotes[i];
148 }
149
150 ret = xcalloc(1, sizeof(struct remote));
151 ret->prune = -1; /* unspecified */
152 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
153 remotes[remotes_nr++] = ret;
154 if (len)
155 ret->name = xstrndup(name, len);
156 else
157 ret->name = xstrdup(name);
158 return ret;
159 }
160
161 static void add_merge(struct branch *branch, const char *name)
162 {
163 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
164 branch->merge_alloc);
165 branch->merge_name[branch->merge_nr++] = name;
166 }
167
168 static struct branch *make_branch(const char *name, int len)
169 {
170 struct branch *ret;
171 int i;
172 char *refname;
173
174 for (i = 0; i < branches_nr; i++) {
175 if (len ? (!strncmp(name, branches[i]->name, len) &&
176 !branches[i]->name[len]) :
177 !strcmp(name, branches[i]->name))
178 return branches[i];
179 }
180
181 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
182 ret = xcalloc(1, sizeof(struct branch));
183 branches[branches_nr++] = ret;
184 if (len)
185 ret->name = xstrndup(name, len);
186 else
187 ret->name = xstrdup(name);
188 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
189 strcpy(refname, "refs/heads/");
190 strcpy(refname + strlen("refs/heads/"), ret->name);
191 ret->refname = refname;
192
193 return ret;
194 }
195
196 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
197 {
198 struct rewrite *ret;
199 int i;
200
201 for (i = 0; i < r->rewrite_nr; i++) {
202 if (len
203 ? (len == r->rewrite[i]->baselen &&
204 !strncmp(base, r->rewrite[i]->base, len))
205 : !strcmp(base, r->rewrite[i]->base))
206 return r->rewrite[i];
207 }
208
209 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
210 ret = xcalloc(1, sizeof(struct rewrite));
211 r->rewrite[r->rewrite_nr++] = ret;
212 if (len) {
213 ret->base = xstrndup(base, len);
214 ret->baselen = len;
215 }
216 else {
217 ret->base = xstrdup(base);
218 ret->baselen = strlen(base);
219 }
220 return ret;
221 }
222
223 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
224 {
225 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
226 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
227 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
228 rewrite->instead_of_nr++;
229 }
230
231 static void read_remotes_file(struct remote *remote)
232 {
233 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
234
235 if (!f)
236 return;
237 remote->origin = REMOTE_REMOTES;
238 while (fgets(buffer, BUF_SIZE, f)) {
239 int value_list;
240 char *s, *p;
241
242 if (!prefixcmp(buffer, "URL:")) {
243 value_list = 0;
244 s = buffer + 4;
245 } else if (!prefixcmp(buffer, "Push:")) {
246 value_list = 1;
247 s = buffer + 5;
248 } else if (!prefixcmp(buffer, "Pull:")) {
249 value_list = 2;
250 s = buffer + 5;
251 } else
252 continue;
253
254 while (isspace(*s))
255 s++;
256 if (!*s)
257 continue;
258
259 p = s + strlen(s);
260 while (isspace(p[-1]))
261 *--p = 0;
262
263 switch (value_list) {
264 case 0:
265 add_url_alias(remote, xstrdup(s));
266 break;
267 case 1:
268 add_push_refspec(remote, xstrdup(s));
269 break;
270 case 2:
271 add_fetch_refspec(remote, xstrdup(s));
272 break;
273 }
274 }
275 fclose(f);
276 }
277
278 static void read_branches_file(struct remote *remote)
279 {
280 char *frag;
281 struct strbuf branch = STRBUF_INIT;
282 int n = 1000;
283 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
284 char *s, *p;
285 int len;
286
287 if (!f)
288 return;
289 s = fgets(buffer, BUF_SIZE, f);
290 fclose(f);
291 if (!s)
292 return;
293 while (isspace(*s))
294 s++;
295 if (!*s)
296 return;
297 remote->origin = REMOTE_BRANCHES;
298 p = s + strlen(s);
299 while (isspace(p[-1]))
300 *--p = 0;
301 len = p - s;
302 p = xmalloc(len + 1);
303 strcpy(p, s);
304
305 /*
306 * The branches file would have URL and optionally
307 * #branch specified. The "master" (or specified) branch is
308 * fetched and stored in the local branch of the same name.
309 */
310 frag = strchr(p, '#');
311 if (frag) {
312 *(frag++) = '\0';
313 strbuf_addf(&branch, "refs/heads/%s", frag);
314 } else
315 strbuf_addstr(&branch, "refs/heads/master");
316
317 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
318 add_url_alias(remote, p);
319 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
320 /*
321 * Cogito compatible push: push current HEAD to remote #branch
322 * (master if missing)
323 */
324 strbuf_init(&branch, 0);
325 strbuf_addstr(&branch, "HEAD");
326 if (frag)
327 strbuf_addf(&branch, ":refs/heads/%s", frag);
328 else
329 strbuf_addstr(&branch, ":refs/heads/master");
330 add_push_refspec(remote, strbuf_detach(&branch, NULL));
331 remote->fetch_tags = 1; /* always auto-follow */
332 }
333
334 static int handle_config(const char *key, const char *value, void *cb)
335 {
336 const char *name;
337 const char *subkey;
338 struct remote *remote;
339 struct branch *branch;
340 if (!prefixcmp(key, "branch.")) {
341 name = key + 7;
342 subkey = strrchr(name, '.');
343 if (!subkey)
344 return 0;
345 branch = make_branch(name, subkey - name);
346 if (!strcmp(subkey, ".remote")) {
347 if (git_config_string(&branch->remote_name, key, value))
348 return -1;
349 if (branch == current_branch) {
350 default_remote_name = branch->remote_name;
351 explicit_default_remote_name = 1;
352 }
353 } else if (!strcmp(subkey, ".pushremote")) {
354 if (branch == current_branch)
355 if (git_config_string(&pushremote_name, key, value))
356 return -1;
357 } else if (!strcmp(subkey, ".merge")) {
358 if (!value)
359 return config_error_nonbool(key);
360 add_merge(branch, xstrdup(value));
361 }
362 return 0;
363 }
364 if (!prefixcmp(key, "url.")) {
365 struct rewrite *rewrite;
366 name = key + 4;
367 subkey = strrchr(name, '.');
368 if (!subkey)
369 return 0;
370 if (!strcmp(subkey, ".insteadof")) {
371 rewrite = make_rewrite(&rewrites, name, subkey - name);
372 if (!value)
373 return config_error_nonbool(key);
374 add_instead_of(rewrite, xstrdup(value));
375 } else if (!strcmp(subkey, ".pushinsteadof")) {
376 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
377 if (!value)
378 return config_error_nonbool(key);
379 add_instead_of(rewrite, xstrdup(value));
380 }
381 }
382
383 if (prefixcmp(key, "remote."))
384 return 0;
385 name = key + 7;
386
387 /* Handle remote.* variables */
388 if (!strcmp(name, "pushdefault"))
389 return git_config_string(&pushremote_name, key, value);
390
391 /* Handle remote.<name>.* variables */
392 if (*name == '/') {
393 warning("Config remote shorthand cannot begin with '/': %s",
394 name);
395 return 0;
396 }
397 subkey = strrchr(name, '.');
398 if (!subkey)
399 return 0;
400 remote = make_remote(name, subkey - name);
401 remote->origin = REMOTE_CONFIG;
402 if (!strcmp(subkey, ".mirror"))
403 remote->mirror = git_config_bool(key, value);
404 else if (!strcmp(subkey, ".skipdefaultupdate"))
405 remote->skip_default_update = git_config_bool(key, value);
406 else if (!strcmp(subkey, ".skipfetchall"))
407 remote->skip_default_update = git_config_bool(key, value);
408 else if (!strcmp(subkey, ".prune"))
409 remote->prune = git_config_bool(key, value);
410 else if (!strcmp(subkey, ".url")) {
411 const char *v;
412 if (git_config_string(&v, key, value))
413 return -1;
414 add_url(remote, v);
415 } else if (!strcmp(subkey, ".pushurl")) {
416 const char *v;
417 if (git_config_string(&v, key, value))
418 return -1;
419 add_pushurl(remote, v);
420 } else if (!strcmp(subkey, ".push")) {
421 const char *v;
422 if (git_config_string(&v, key, value))
423 return -1;
424 add_push_refspec(remote, v);
425 } else if (!strcmp(subkey, ".fetch")) {
426 const char *v;
427 if (git_config_string(&v, key, value))
428 return -1;
429 add_fetch_refspec(remote, v);
430 } else if (!strcmp(subkey, ".receivepack")) {
431 const char *v;
432 if (git_config_string(&v, key, value))
433 return -1;
434 if (!remote->receivepack)
435 remote->receivepack = v;
436 else
437 error("more than one receivepack given, using the first");
438 } else if (!strcmp(subkey, ".uploadpack")) {
439 const char *v;
440 if (git_config_string(&v, key, value))
441 return -1;
442 if (!remote->uploadpack)
443 remote->uploadpack = v;
444 else
445 error("more than one uploadpack given, using the first");
446 } else if (!strcmp(subkey, ".tagopt")) {
447 if (!strcmp(value, "--no-tags"))
448 remote->fetch_tags = -1;
449 else if (!strcmp(value, "--tags"))
450 remote->fetch_tags = 2;
451 } else if (!strcmp(subkey, ".proxy")) {
452 return git_config_string((const char **)&remote->http_proxy,
453 key, value);
454 } else if (!strcmp(subkey, ".vcs")) {
455 return git_config_string(&remote->foreign_vcs, key, value);
456 }
457 return 0;
458 }
459
460 static void alias_all_urls(void)
461 {
462 int i, j;
463 for (i = 0; i < remotes_nr; i++) {
464 int add_pushurl_aliases;
465 if (!remotes[i])
466 continue;
467 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
468 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
469 }
470 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
471 for (j = 0; j < remotes[i]->url_nr; j++) {
472 if (add_pushurl_aliases)
473 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
474 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
475 }
476 }
477 }
478
479 static void read_config(void)
480 {
481 unsigned char sha1[20];
482 const char *head_ref;
483 int flag;
484 if (default_remote_name) /* did this already */
485 return;
486 default_remote_name = xstrdup("origin");
487 current_branch = NULL;
488 head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
489 if (head_ref && (flag & REF_ISSYMREF) &&
490 !prefixcmp(head_ref, "refs/heads/")) {
491 current_branch =
492 make_branch(head_ref + strlen("refs/heads/"), 0);
493 }
494 git_config(handle_config, NULL);
495 alias_all_urls();
496 }
497
498 /*
499 * This function frees a refspec array.
500 * Warning: code paths should be checked to ensure that the src
501 * and dst pointers are always freeable pointers as well
502 * as the refspec pointer itself.
503 */
504 static void free_refspecs(struct refspec *refspec, int nr_refspec)
505 {
506 int i;
507
508 if (!refspec)
509 return;
510
511 for (i = 0; i < nr_refspec; i++) {
512 free(refspec[i].src);
513 free(refspec[i].dst);
514 }
515 free(refspec);
516 }
517
518 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
519 {
520 int i;
521 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
522
523 for (i = 0; i < nr_refspec; i++) {
524 size_t llen;
525 int is_glob;
526 const char *lhs, *rhs;
527 int flags;
528
529 is_glob = 0;
530
531 lhs = refspec[i];
532 if (*lhs == '+') {
533 rs[i].force = 1;
534 lhs++;
535 }
536
537 rhs = strrchr(lhs, ':');
538
539 /*
540 * Before going on, special case ":" (or "+:") as a refspec
541 * for pushing matching refs.
542 */
543 if (!fetch && rhs == lhs && rhs[1] == '\0') {
544 rs[i].matching = 1;
545 continue;
546 }
547
548 if (rhs) {
549 size_t rlen = strlen(++rhs);
550 is_glob = (1 <= rlen && strchr(rhs, '*'));
551 rs[i].dst = xstrndup(rhs, rlen);
552 }
553
554 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
555 if (1 <= llen && memchr(lhs, '*', llen)) {
556 if ((rhs && !is_glob) || (!rhs && fetch))
557 goto invalid;
558 is_glob = 1;
559 } else if (rhs && is_glob) {
560 goto invalid;
561 }
562
563 rs[i].pattern = is_glob;
564 rs[i].src = xstrndup(lhs, llen);
565 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
566
567 if (fetch) {
568 unsigned char unused[40];
569
570 /* LHS */
571 if (!*rs[i].src)
572 ; /* empty is ok; it means "HEAD" */
573 else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
574 rs[i].exact_sha1 = 1; /* ok */
575 else if (!check_refname_format(rs[i].src, flags))
576 ; /* valid looking ref is ok */
577 else
578 goto invalid;
579 /* RHS */
580 if (!rs[i].dst)
581 ; /* missing is ok; it is the same as empty */
582 else if (!*rs[i].dst)
583 ; /* empty is ok; it means "do not store" */
584 else if (!check_refname_format(rs[i].dst, flags))
585 ; /* valid looking ref is ok */
586 else
587 goto invalid;
588 } else {
589 /*
590 * LHS
591 * - empty is allowed; it means delete.
592 * - when wildcarded, it must be a valid looking ref.
593 * - otherwise, it must be an extended SHA-1, but
594 * there is no existing way to validate this.
595 */
596 if (!*rs[i].src)
597 ; /* empty is ok */
598 else if (is_glob) {
599 if (check_refname_format(rs[i].src, flags))
600 goto invalid;
601 }
602 else
603 ; /* anything goes, for now */
604 /*
605 * RHS
606 * - missing is allowed, but LHS then must be a
607 * valid looking ref.
608 * - empty is not allowed.
609 * - otherwise it must be a valid looking ref.
610 */
611 if (!rs[i].dst) {
612 if (check_refname_format(rs[i].src, flags))
613 goto invalid;
614 } else if (!*rs[i].dst) {
615 goto invalid;
616 } else {
617 if (check_refname_format(rs[i].dst, flags))
618 goto invalid;
619 }
620 }
621 }
622 return rs;
623
624 invalid:
625 if (verify) {
626 /*
627 * nr_refspec must be greater than zero and i must be valid
628 * since it is only possible to reach this point from within
629 * the for loop above.
630 */
631 free_refspecs(rs, i+1);
632 return NULL;
633 }
634 die("Invalid refspec '%s'", refspec[i]);
635 }
636
637 int valid_fetch_refspec(const char *fetch_refspec_str)
638 {
639 struct refspec *refspec;
640
641 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
642 free_refspecs(refspec, 1);
643 return !!refspec;
644 }
645
646 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
647 {
648 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
649 }
650
651 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
652 {
653 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
654 }
655
656 void free_refspec(int nr_refspec, struct refspec *refspec)
657 {
658 int i;
659 for (i = 0; i < nr_refspec; i++) {
660 free(refspec[i].src);
661 free(refspec[i].dst);
662 }
663 free(refspec);
664 }
665
666 static int valid_remote_nick(const char *name)
667 {
668 if (!name[0] || is_dot_or_dotdot(name))
669 return 0;
670 return !strchr(name, '/'); /* no slash */
671 }
672
673 static struct remote *remote_get_1(const char *name, const char *pushremote_name)
674 {
675 struct remote *ret;
676 int name_given = 0;
677
678 if (name)
679 name_given = 1;
680 else {
681 if (pushremote_name) {
682 name = pushremote_name;
683 name_given = 1;
684 } else {
685 name = default_remote_name;
686 name_given = explicit_default_remote_name;
687 }
688 }
689
690 ret = make_remote(name, 0);
691 if (valid_remote_nick(name)) {
692 if (!valid_remote(ret))
693 read_remotes_file(ret);
694 if (!valid_remote(ret))
695 read_branches_file(ret);
696 }
697 if (name_given && !valid_remote(ret))
698 add_url_alias(ret, name);
699 if (!valid_remote(ret))
700 return NULL;
701 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
702 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
703 return ret;
704 }
705
706 struct remote *remote_get(const char *name)
707 {
708 read_config();
709 return remote_get_1(name, NULL);
710 }
711
712 struct remote *pushremote_get(const char *name)
713 {
714 read_config();
715 return remote_get_1(name, pushremote_name);
716 }
717
718 int remote_is_configured(const char *name)
719 {
720 int i;
721 read_config();
722
723 for (i = 0; i < remotes_nr; i++)
724 if (!strcmp(name, remotes[i]->name))
725 return 1;
726 return 0;
727 }
728
729 int for_each_remote(each_remote_fn fn, void *priv)
730 {
731 int i, result = 0;
732 read_config();
733 for (i = 0; i < remotes_nr && !result; i++) {
734 struct remote *r = remotes[i];
735 if (!r)
736 continue;
737 if (!r->fetch)
738 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
739 r->fetch_refspec);
740 if (!r->push)
741 r->push = parse_push_refspec(r->push_refspec_nr,
742 r->push_refspec);
743 result = fn(r, priv);
744 }
745 return result;
746 }
747
748 void ref_remove_duplicates(struct ref *ref_map)
749 {
750 struct string_list refs = STRING_LIST_INIT_NODUP;
751 struct string_list_item *item = NULL;
752 struct ref *prev = NULL, *next = NULL;
753 for (; ref_map; prev = ref_map, ref_map = next) {
754 next = ref_map->next;
755 if (!ref_map->peer_ref)
756 continue;
757
758 item = string_list_lookup(&refs, ref_map->peer_ref->name);
759 if (item) {
760 if (strcmp(((struct ref *)item->util)->name,
761 ref_map->name))
762 die("%s tracks both %s and %s",
763 ref_map->peer_ref->name,
764 ((struct ref *)item->util)->name,
765 ref_map->name);
766 prev->next = ref_map->next;
767 free(ref_map->peer_ref);
768 free(ref_map);
769 ref_map = prev; /* skip this; we freed it */
770 continue;
771 }
772
773 item = string_list_insert(&refs, ref_map->peer_ref->name);
774 item->util = ref_map;
775 }
776 string_list_clear(&refs, 0);
777 }
778
779 int remote_has_url(struct remote *remote, const char *url)
780 {
781 int i;
782 for (i = 0; i < remote->url_nr; i++) {
783 if (!strcmp(remote->url[i], url))
784 return 1;
785 }
786 return 0;
787 }
788
789 static int match_name_with_pattern(const char *key, const char *name,
790 const char *value, char **result)
791 {
792 const char *kstar = strchr(key, '*');
793 size_t klen;
794 size_t ksuffixlen;
795 size_t namelen;
796 int ret;
797 if (!kstar)
798 die("Key '%s' of pattern had no '*'", key);
799 klen = kstar - key;
800 ksuffixlen = strlen(kstar + 1);
801 namelen = strlen(name);
802 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
803 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
804 if (ret && value) {
805 const char *vstar = strchr(value, '*');
806 size_t vlen;
807 size_t vsuffixlen;
808 if (!vstar)
809 die("Value '%s' of pattern has no '*'", value);
810 vlen = vstar - value;
811 vsuffixlen = strlen(vstar + 1);
812 *result = xmalloc(vlen + vsuffixlen +
813 strlen(name) -
814 klen - ksuffixlen + 1);
815 strncpy(*result, value, vlen);
816 strncpy(*result + vlen,
817 name + klen, namelen - klen - ksuffixlen);
818 strcpy(*result + vlen + namelen - klen - ksuffixlen,
819 vstar + 1);
820 }
821 return ret;
822 }
823
824 static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
825 {
826 int i;
827 int find_src = !query->src;
828
829 if (find_src && !query->dst)
830 return error("query_refspecs: need either src or dst");
831
832 for (i = 0; i < ref_count; i++) {
833 struct refspec *refspec = &refs[i];
834 const char *key = find_src ? refspec->dst : refspec->src;
835 const char *value = find_src ? refspec->src : refspec->dst;
836 const char *needle = find_src ? query->dst : query->src;
837 char **result = find_src ? &query->src : &query->dst;
838
839 if (!refspec->dst)
840 continue;
841 if (refspec->pattern) {
842 if (match_name_with_pattern(key, needle, value, result)) {
843 query->force = refspec->force;
844 return 0;
845 }
846 } else if (!strcmp(needle, key)) {
847 *result = xstrdup(value);
848 query->force = refspec->force;
849 return 0;
850 }
851 }
852 return -1;
853 }
854
855 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
856 const char *name)
857 {
858 struct refspec query;
859
860 memset(&query, 0, sizeof(struct refspec));
861 query.src = (char *)name;
862
863 if (query_refspecs(refspecs, nr_refspec, &query))
864 return NULL;
865
866 return query.dst;
867 }
868
869 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
870 {
871 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
872 }
873
874 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
875 const char *name)
876 {
877 size_t len = strlen(name);
878 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
879 memcpy(ref->name, prefix, prefixlen);
880 memcpy(ref->name + prefixlen, name, len);
881 return ref;
882 }
883
884 struct ref *alloc_ref(const char *name)
885 {
886 return alloc_ref_with_prefix("", 0, name);
887 }
888
889 struct ref *copy_ref(const struct ref *ref)
890 {
891 struct ref *cpy;
892 size_t len;
893 if (!ref)
894 return NULL;
895 len = strlen(ref->name);
896 cpy = xmalloc(sizeof(struct ref) + len + 1);
897 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
898 cpy->next = NULL;
899 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
900 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
901 cpy->peer_ref = copy_ref(ref->peer_ref);
902 return cpy;
903 }
904
905 struct ref *copy_ref_list(const struct ref *ref)
906 {
907 struct ref *ret = NULL;
908 struct ref **tail = &ret;
909 while (ref) {
910 *tail = copy_ref(ref);
911 ref = ref->next;
912 tail = &((*tail)->next);
913 }
914 return ret;
915 }
916
917 static void free_ref(struct ref *ref)
918 {
919 if (!ref)
920 return;
921 free_ref(ref->peer_ref);
922 free(ref->remote_status);
923 free(ref->symref);
924 free(ref);
925 }
926
927 void free_refs(struct ref *ref)
928 {
929 struct ref *next;
930 while (ref) {
931 next = ref->next;
932 free_ref(ref);
933 ref = next;
934 }
935 }
936
937 int ref_compare_name(const void *va, const void *vb)
938 {
939 const struct ref *a = va, *b = vb;
940 return strcmp(a->name, b->name);
941 }
942
943 static void *ref_list_get_next(const void *a)
944 {
945 return ((const struct ref *)a)->next;
946 }
947
948 static void ref_list_set_next(void *a, void *next)
949 {
950 ((struct ref *)a)->next = next;
951 }
952
953 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
954 {
955 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
956 }
957
958 static int count_refspec_match(const char *pattern,
959 struct ref *refs,
960 struct ref **matched_ref)
961 {
962 int patlen = strlen(pattern);
963 struct ref *matched_weak = NULL;
964 struct ref *matched = NULL;
965 int weak_match = 0;
966 int match = 0;
967
968 for (weak_match = match = 0; refs; refs = refs->next) {
969 char *name = refs->name;
970 int namelen = strlen(name);
971
972 if (!refname_match(pattern, name, ref_rev_parse_rules))
973 continue;
974
975 /* A match is "weak" if it is with refs outside
976 * heads or tags, and did not specify the pattern
977 * in full (e.g. "refs/remotes/origin/master") or at
978 * least from the toplevel (e.g. "remotes/origin/master");
979 * otherwise "git push $URL master" would result in
980 * ambiguity between remotes/origin/master and heads/master
981 * at the remote site.
982 */
983 if (namelen != patlen &&
984 patlen != namelen - 5 &&
985 prefixcmp(name, "refs/heads/") &&
986 prefixcmp(name, "refs/tags/")) {
987 /* We want to catch the case where only weak
988 * matches are found and there are multiple
989 * matches, and where more than one strong
990 * matches are found, as ambiguous. One
991 * strong match with zero or more weak matches
992 * are acceptable as a unique match.
993 */
994 matched_weak = refs;
995 weak_match++;
996 }
997 else {
998 matched = refs;
999 match++;
1000 }
1001 }
1002 if (!matched) {
1003 *matched_ref = matched_weak;
1004 return weak_match;
1005 }
1006 else {
1007 *matched_ref = matched;
1008 return match;
1009 }
1010 }
1011
1012 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1013 {
1014 **tail = ref;
1015 while (ref->next)
1016 ref = ref->next;
1017 *tail = &ref->next;
1018 }
1019
1020 static struct ref *alloc_delete_ref(void)
1021 {
1022 struct ref *ref = alloc_ref("(delete)");
1023 hashclr(ref->new_sha1);
1024 return ref;
1025 }
1026
1027 static struct ref *try_explicit_object_name(const char *name)
1028 {
1029 unsigned char sha1[20];
1030 struct ref *ref;
1031
1032 if (!*name)
1033 return alloc_delete_ref();
1034 if (get_sha1(name, sha1))
1035 return NULL;
1036 ref = alloc_ref(name);
1037 hashcpy(ref->new_sha1, sha1);
1038 return ref;
1039 }
1040
1041 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1042 {
1043 struct ref *ret = alloc_ref(name);
1044 tail_link_ref(ret, tail);
1045 return ret;
1046 }
1047
1048 static char *guess_ref(const char *name, struct ref *peer)
1049 {
1050 struct strbuf buf = STRBUF_INIT;
1051 unsigned char sha1[20];
1052
1053 const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1054 if (!r)
1055 return NULL;
1056
1057 if (!prefixcmp(r, "refs/heads/"))
1058 strbuf_addstr(&buf, "refs/heads/");
1059 else if (!prefixcmp(r, "refs/tags/"))
1060 strbuf_addstr(&buf, "refs/tags/");
1061 else
1062 return NULL;
1063
1064 strbuf_addstr(&buf, name);
1065 return strbuf_detach(&buf, NULL);
1066 }
1067
1068 static int match_explicit(struct ref *src, struct ref *dst,
1069 struct ref ***dst_tail,
1070 struct refspec *rs)
1071 {
1072 struct ref *matched_src, *matched_dst;
1073 int copy_src;
1074
1075 const char *dst_value = rs->dst;
1076 char *dst_guess;
1077
1078 if (rs->pattern || rs->matching)
1079 return 0;
1080
1081 matched_src = matched_dst = NULL;
1082 switch (count_refspec_match(rs->src, src, &matched_src)) {
1083 case 1:
1084 copy_src = 1;
1085 break;
1086 case 0:
1087 /* The source could be in the get_sha1() format
1088 * not a reference name. :refs/other is a
1089 * way to delete 'other' ref at the remote end.
1090 */
1091 matched_src = try_explicit_object_name(rs->src);
1092 if (!matched_src)
1093 return error("src refspec %s does not match any.", rs->src);
1094 copy_src = 0;
1095 break;
1096 default:
1097 return error("src refspec %s matches more than one.", rs->src);
1098 }
1099
1100 if (!dst_value) {
1101 unsigned char sha1[20];
1102 int flag;
1103
1104 dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1105 if (!dst_value ||
1106 ((flag & REF_ISSYMREF) &&
1107 prefixcmp(dst_value, "refs/heads/")))
1108 die("%s cannot be resolved to branch.",
1109 matched_src->name);
1110 }
1111
1112 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1113 case 1:
1114 break;
1115 case 0:
1116 if (!memcmp(dst_value, "refs/", 5))
1117 matched_dst = make_linked_ref(dst_value, dst_tail);
1118 else if (is_null_sha1(matched_src->new_sha1))
1119 error("unable to delete '%s': remote ref does not exist",
1120 dst_value);
1121 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1122 matched_dst = make_linked_ref(dst_guess, dst_tail);
1123 else
1124 error("unable to push to unqualified destination: %s\n"
1125 "The destination refspec neither matches an "
1126 "existing ref on the remote nor\n"
1127 "begins with refs/, and we are unable to "
1128 "guess a prefix based on the source ref.",
1129 dst_value);
1130 break;
1131 default:
1132 matched_dst = NULL;
1133 error("dst refspec %s matches more than one.",
1134 dst_value);
1135 break;
1136 }
1137 if (!matched_dst)
1138 return -1;
1139 if (matched_dst->peer_ref)
1140 return error("dst ref %s receives from more than one src.",
1141 matched_dst->name);
1142 else {
1143 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1144 matched_dst->force = rs->force;
1145 }
1146 return 0;
1147 }
1148
1149 static int match_explicit_refs(struct ref *src, struct ref *dst,
1150 struct ref ***dst_tail, struct refspec *rs,
1151 int rs_nr)
1152 {
1153 int i, errs;
1154 for (i = errs = 0; i < rs_nr; i++)
1155 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1156 return errs;
1157 }
1158
1159 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1160 int send_mirror, int direction, const struct refspec **ret_pat)
1161 {
1162 const struct refspec *pat;
1163 char *name;
1164 int i;
1165 int matching_refs = -1;
1166 for (i = 0; i < rs_nr; i++) {
1167 if (rs[i].matching &&
1168 (matching_refs == -1 || rs[i].force)) {
1169 matching_refs = i;
1170 continue;
1171 }
1172
1173 if (rs[i].pattern) {
1174 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1175 int match;
1176 if (direction == FROM_SRC)
1177 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1178 else
1179 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1180 if (match) {
1181 matching_refs = i;
1182 break;
1183 }
1184 }
1185 }
1186 if (matching_refs == -1)
1187 return NULL;
1188
1189 pat = rs + matching_refs;
1190 if (pat->matching) {
1191 /*
1192 * "matching refs"; traditionally we pushed everything
1193 * including refs outside refs/heads/ hierarchy, but
1194 * that does not make much sense these days.
1195 */
1196 if (!send_mirror && prefixcmp(ref->name, "refs/heads/"))
1197 return NULL;
1198 name = xstrdup(ref->name);
1199 }
1200 if (ret_pat)
1201 *ret_pat = pat;
1202 return name;
1203 }
1204
1205 static struct ref **tail_ref(struct ref **head)
1206 {
1207 struct ref **tail = head;
1208 while (*tail)
1209 tail = &((*tail)->next);
1210 return tail;
1211 }
1212
1213 struct tips {
1214 struct commit **tip;
1215 int nr, alloc;
1216 };
1217
1218 static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1219 {
1220 struct commit *commit;
1221
1222 if (is_null_sha1(sha1))
1223 return;
1224 commit = lookup_commit_reference_gently(sha1, 1);
1225 if (!commit || (commit->object.flags & TMP_MARK))
1226 return;
1227 commit->object.flags |= TMP_MARK;
1228 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1229 tips->tip[tips->nr++] = commit;
1230 }
1231
1232 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1233 {
1234 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1235 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1236 struct string_list_item *item;
1237 struct ref *ref;
1238 struct tips sent_tips;
1239
1240 /*
1241 * Collect everything we know they would have at the end of
1242 * this push, and collect all tags they have.
1243 */
1244 memset(&sent_tips, 0, sizeof(sent_tips));
1245 for (ref = *dst; ref; ref = ref->next) {
1246 if (ref->peer_ref &&
1247 !is_null_sha1(ref->peer_ref->new_sha1))
1248 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1249 else
1250 add_to_tips(&sent_tips, ref->old_sha1);
1251 if (!prefixcmp(ref->name, "refs/tags/"))
1252 string_list_append(&dst_tag, ref->name);
1253 }
1254 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1255
1256 sort_string_list(&dst_tag);
1257
1258 /* Collect tags they do not have. */
1259 for (ref = src; ref; ref = ref->next) {
1260 if (prefixcmp(ref->name, "refs/tags/"))
1261 continue; /* not a tag */
1262 if (string_list_has_string(&dst_tag, ref->name))
1263 continue; /* they already have it */
1264 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1265 continue; /* be conservative */
1266 item = string_list_append(&src_tag, ref->name);
1267 item->util = ref;
1268 }
1269 string_list_clear(&dst_tag, 0);
1270
1271 /*
1272 * At this point, src_tag lists tags that are missing from
1273 * dst, and sent_tips lists the tips we are pushing or those
1274 * that we know they already have. An element in the src_tag
1275 * that is an ancestor of any of the sent_tips needs to be
1276 * sent to the other side.
1277 */
1278 if (sent_tips.nr) {
1279 for_each_string_list_item(item, &src_tag) {
1280 struct ref *ref = item->util;
1281 struct ref *dst_ref;
1282 struct commit *commit;
1283
1284 if (is_null_sha1(ref->new_sha1))
1285 continue;
1286 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1287 if (!commit)
1288 /* not pushing a commit, which is not an error */
1289 continue;
1290
1291 /*
1292 * Is this tag, which they do not have, reachable from
1293 * any of the commits we are sending?
1294 */
1295 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1296 continue;
1297
1298 /* Add it in */
1299 dst_ref = make_linked_ref(ref->name, dst_tail);
1300 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1301 dst_ref->peer_ref = copy_ref(ref);
1302 }
1303 }
1304 string_list_clear(&src_tag, 0);
1305 free(sent_tips.tip);
1306 }
1307
1308 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1309 {
1310 for ( ; list; list = list->next)
1311 if (!strcmp(list->name, name))
1312 return (struct ref *)list;
1313 return NULL;
1314 }
1315
1316 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1317 {
1318 for ( ; ref; ref = ref->next)
1319 string_list_append_nodup(ref_index, ref->name)->util = ref;
1320
1321 sort_string_list(ref_index);
1322 }
1323
1324 /*
1325 * Given the set of refs the local repository has, the set of refs the
1326 * remote repository has, and the refspec used for push, determine
1327 * what remote refs we will update and with what value by setting
1328 * peer_ref (which object is being pushed) and force (if the push is
1329 * forced) in elements of "dst". The function may add new elements to
1330 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1331 */
1332 int match_push_refs(struct ref *src, struct ref **dst,
1333 int nr_refspec, const char **refspec, int flags)
1334 {
1335 struct refspec *rs;
1336 int send_all = flags & MATCH_REFS_ALL;
1337 int send_mirror = flags & MATCH_REFS_MIRROR;
1338 int send_prune = flags & MATCH_REFS_PRUNE;
1339 int errs;
1340 static const char *default_refspec[] = { ":", NULL };
1341 struct ref *ref, **dst_tail = tail_ref(dst);
1342 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1343
1344 if (!nr_refspec) {
1345 nr_refspec = 1;
1346 refspec = default_refspec;
1347 }
1348 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1349 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1350
1351 /* pick the remainder */
1352 for (ref = src; ref; ref = ref->next) {
1353 struct string_list_item *dst_item;
1354 struct ref *dst_peer;
1355 const struct refspec *pat = NULL;
1356 char *dst_name;
1357
1358 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1359 if (!dst_name)
1360 continue;
1361
1362 if (!dst_ref_index.nr)
1363 prepare_ref_index(&dst_ref_index, *dst);
1364
1365 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1366 dst_peer = dst_item ? dst_item->util : NULL;
1367 if (dst_peer) {
1368 if (dst_peer->peer_ref)
1369 /* We're already sending something to this ref. */
1370 goto free_name;
1371 } else {
1372 if (pat->matching && !(send_all || send_mirror))
1373 /*
1374 * Remote doesn't have it, and we have no
1375 * explicit pattern, and we don't have
1376 * --all nor --mirror.
1377 */
1378 goto free_name;
1379
1380 /* Create a new one and link it */
1381 dst_peer = make_linked_ref(dst_name, &dst_tail);
1382 hashcpy(dst_peer->new_sha1, ref->new_sha1);
1383 string_list_insert(&dst_ref_index,
1384 dst_peer->name)->util = dst_peer;
1385 }
1386 dst_peer->peer_ref = copy_ref(ref);
1387 dst_peer->force = pat->force;
1388 free_name:
1389 free(dst_name);
1390 }
1391
1392 string_list_clear(&dst_ref_index, 0);
1393
1394 if (flags & MATCH_REFS_FOLLOW_TAGS)
1395 add_missing_tags(src, dst, &dst_tail);
1396
1397 if (send_prune) {
1398 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1399 /* check for missing refs on the remote */
1400 for (ref = *dst; ref; ref = ref->next) {
1401 char *src_name;
1402
1403 if (ref->peer_ref)
1404 /* We're already sending something to this ref. */
1405 continue;
1406
1407 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1408 if (src_name) {
1409 if (!src_ref_index.nr)
1410 prepare_ref_index(&src_ref_index, src);
1411 if (!string_list_has_string(&src_ref_index,
1412 src_name))
1413 ref->peer_ref = alloc_delete_ref();
1414 free(src_name);
1415 }
1416 }
1417 string_list_clear(&src_ref_index, 0);
1418 }
1419 if (errs)
1420 return -1;
1421 return 0;
1422 }
1423
1424 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1425 int force_update)
1426 {
1427 struct ref *ref;
1428
1429 for (ref = remote_refs; ref; ref = ref->next) {
1430 int force_ref_update = ref->force || force_update;
1431 int reject_reason = 0;
1432
1433 if (ref->peer_ref)
1434 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1435 else if (!send_mirror)
1436 continue;
1437
1438 ref->deletion = is_null_sha1(ref->new_sha1);
1439 if (!ref->deletion &&
1440 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1441 ref->status = REF_STATUS_UPTODATE;
1442 continue;
1443 }
1444
1445 /*
1446 * Bypass the usual "must fast-forward" check but
1447 * replace it with a weaker "the old value must be
1448 * this value we observed". If the remote ref has
1449 * moved and is now different from what we expect,
1450 * reject any push.
1451 *
1452 * It also is an error if the user told us to check
1453 * with the remote-tracking branch to find the value
1454 * to expect, but we did not have such a tracking
1455 * branch.
1456 */
1457 if (ref->expect_old_sha1) {
1458 if (ref->expect_old_no_trackback ||
1459 hashcmp(ref->old_sha1, ref->old_sha1_expect))
1460 reject_reason = REF_STATUS_REJECT_STALE;
1461 }
1462
1463 /*
1464 * The usual "must fast-forward" rules.
1465 *
1466 * Decide whether an individual refspec A:B can be
1467 * pushed. The push will succeed if any of the
1468 * following are true:
1469 *
1470 * (1) the remote reference B does not exist
1471 *
1472 * (2) the remote reference B is being removed (i.e.,
1473 * pushing :B where no source is specified)
1474 *
1475 * (3) the destination is not under refs/tags/, and
1476 * if the old and new value is a commit, the new
1477 * is a descendant of the old.
1478 *
1479 * (4) it is forced using the +A:B notation, or by
1480 * passing the --force argument
1481 */
1482
1483 else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1484 if (!prefixcmp(ref->name, "refs/tags/"))
1485 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1486 else if (!has_sha1_file(ref->old_sha1))
1487 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1488 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1489 !lookup_commit_reference_gently(ref->new_sha1, 1))
1490 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1491 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1492 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1493 }
1494
1495 /*
1496 * "--force" will defeat any rejection implemented
1497 * by the rules above.
1498 */
1499 if (!force_ref_update)
1500 ref->status = reject_reason;
1501 else if (reject_reason)
1502 ref->forced_update = 1;
1503 }
1504 }
1505
1506 struct branch *branch_get(const char *name)
1507 {
1508 struct branch *ret;
1509
1510 read_config();
1511 if (!name || !*name || !strcmp(name, "HEAD"))
1512 ret = current_branch;
1513 else
1514 ret = make_branch(name, 0);
1515 if (ret && ret->remote_name) {
1516 ret->remote = remote_get(ret->remote_name);
1517 if (ret->merge_nr) {
1518 int i;
1519 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1520 for (i = 0; i < ret->merge_nr; i++) {
1521 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1522 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1523 if (remote_find_tracking(ret->remote, ret->merge[i])
1524 && !strcmp(ret->remote_name, "."))
1525 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1526 }
1527 }
1528 }
1529 return ret;
1530 }
1531
1532 int branch_has_merge_config(struct branch *branch)
1533 {
1534 return branch && !!branch->merge;
1535 }
1536
1537 int branch_merge_matches(struct branch *branch,
1538 int i,
1539 const char *refname)
1540 {
1541 if (!branch || i < 0 || i >= branch->merge_nr)
1542 return 0;
1543 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1544 }
1545
1546 static int ignore_symref_update(const char *refname)
1547 {
1548 unsigned char sha1[20];
1549 int flag;
1550
1551 if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1552 return 0; /* non-existing refs are OK */
1553 return (flag & REF_ISSYMREF);
1554 }
1555
1556 static struct ref *get_expanded_map(const struct ref *remote_refs,
1557 const struct refspec *refspec)
1558 {
1559 const struct ref *ref;
1560 struct ref *ret = NULL;
1561 struct ref **tail = &ret;
1562
1563 char *expn_name;
1564
1565 for (ref = remote_refs; ref; ref = ref->next) {
1566 if (strchr(ref->name, '^'))
1567 continue; /* a dereference item */
1568 if (match_name_with_pattern(refspec->src, ref->name,
1569 refspec->dst, &expn_name) &&
1570 !ignore_symref_update(expn_name)) {
1571 struct ref *cpy = copy_ref(ref);
1572
1573 cpy->peer_ref = alloc_ref(expn_name);
1574 free(expn_name);
1575 if (refspec->force)
1576 cpy->peer_ref->force = 1;
1577 *tail = cpy;
1578 tail = &cpy->next;
1579 }
1580 }
1581
1582 return ret;
1583 }
1584
1585 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1586 {
1587 const struct ref *ref;
1588 for (ref = refs; ref; ref = ref->next) {
1589 if (refname_match(name, ref->name, ref_fetch_rules))
1590 return ref;
1591 }
1592 return NULL;
1593 }
1594
1595 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1596 {
1597 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1598
1599 if (!ref)
1600 return NULL;
1601
1602 return copy_ref(ref);
1603 }
1604
1605 static struct ref *get_local_ref(const char *name)
1606 {
1607 if (!name || name[0] == '\0')
1608 return NULL;
1609
1610 if (!prefixcmp(name, "refs/"))
1611 return alloc_ref(name);
1612
1613 if (!prefixcmp(name, "heads/") ||
1614 !prefixcmp(name, "tags/") ||
1615 !prefixcmp(name, "remotes/"))
1616 return alloc_ref_with_prefix("refs/", 5, name);
1617
1618 return alloc_ref_with_prefix("refs/heads/", 11, name);
1619 }
1620
1621 int get_fetch_map(const struct ref *remote_refs,
1622 const struct refspec *refspec,
1623 struct ref ***tail,
1624 int missing_ok)
1625 {
1626 struct ref *ref_map, **rmp;
1627
1628 if (refspec->pattern) {
1629 ref_map = get_expanded_map(remote_refs, refspec);
1630 } else {
1631 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1632
1633 if (refspec->exact_sha1) {
1634 ref_map = alloc_ref(name);
1635 get_sha1_hex(name, ref_map->old_sha1);
1636 } else {
1637 ref_map = get_remote_ref(remote_refs, name);
1638 }
1639 if (!missing_ok && !ref_map)
1640 die("Couldn't find remote ref %s", name);
1641 if (ref_map) {
1642 ref_map->peer_ref = get_local_ref(refspec->dst);
1643 if (ref_map->peer_ref && refspec->force)
1644 ref_map->peer_ref->force = 1;
1645 }
1646 }
1647
1648 for (rmp = &ref_map; *rmp; ) {
1649 if ((*rmp)->peer_ref) {
1650 if (prefixcmp((*rmp)->peer_ref->name, "refs/") ||
1651 check_refname_format((*rmp)->peer_ref->name, 0)) {
1652 struct ref *ignore = *rmp;
1653 error("* Ignoring funny ref '%s' locally",
1654 (*rmp)->peer_ref->name);
1655 *rmp = (*rmp)->next;
1656 free(ignore->peer_ref);
1657 free(ignore);
1658 continue;
1659 }
1660 }
1661 rmp = &((*rmp)->next);
1662 }
1663
1664 if (ref_map)
1665 tail_link_ref(ref_map, tail);
1666
1667 return 0;
1668 }
1669
1670 int resolve_remote_symref(struct ref *ref, struct ref *list)
1671 {
1672 if (!ref->symref)
1673 return 0;
1674 for (; list; list = list->next)
1675 if (!strcmp(ref->symref, list->name)) {
1676 hashcpy(ref->old_sha1, list->old_sha1);
1677 return 0;
1678 }
1679 return 1;
1680 }
1681
1682 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1683 {
1684 while (list) {
1685 struct commit_list *temp = list;
1686 temp->item->object.flags &= ~mark;
1687 list = temp->next;
1688 free(temp);
1689 }
1690 }
1691
1692 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1693 {
1694 struct object *o;
1695 struct commit *old, *new;
1696 struct commit_list *list, *used;
1697 int found = 0;
1698
1699 /*
1700 * Both new and old must be commit-ish and new is descendant of
1701 * old. Otherwise we require --force.
1702 */
1703 o = deref_tag(parse_object(old_sha1), NULL, 0);
1704 if (!o || o->type != OBJ_COMMIT)
1705 return 0;
1706 old = (struct commit *) o;
1707
1708 o = deref_tag(parse_object(new_sha1), NULL, 0);
1709 if (!o || o->type != OBJ_COMMIT)
1710 return 0;
1711 new = (struct commit *) o;
1712
1713 if (parse_commit(new) < 0)
1714 return 0;
1715
1716 used = list = NULL;
1717 commit_list_insert(new, &list);
1718 while (list) {
1719 new = pop_most_recent_commit(&list, TMP_MARK);
1720 commit_list_insert(new, &used);
1721 if (new == old) {
1722 found = 1;
1723 break;
1724 }
1725 }
1726 unmark_and_free(list, TMP_MARK);
1727 unmark_and_free(used, TMP_MARK);
1728 return found;
1729 }
1730
1731 /*
1732 * Return true if there is anything to report, otherwise false.
1733 */
1734 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1735 {
1736 unsigned char sha1[20];
1737 struct commit *ours, *theirs;
1738 char symmetric[84];
1739 struct rev_info revs;
1740 const char *rev_argv[10], *base;
1741 int rev_argc;
1742
1743 /*
1744 * Nothing to report unless we are marked to build on top of
1745 * somebody else.
1746 */
1747 if (!branch ||
1748 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1749 return 0;
1750
1751 /*
1752 * If what we used to build on no longer exists, there is
1753 * nothing to report.
1754 */
1755 base = branch->merge[0]->dst;
1756 if (read_ref(base, sha1))
1757 return 0;
1758 theirs = lookup_commit_reference(sha1);
1759 if (!theirs)
1760 return 0;
1761
1762 if (read_ref(branch->refname, sha1))
1763 return 0;
1764 ours = lookup_commit_reference(sha1);
1765 if (!ours)
1766 return 0;
1767
1768 /* are we the same? */
1769 if (theirs == ours)
1770 return 0;
1771
1772 /* Run "rev-list --left-right ours...theirs" internally... */
1773 rev_argc = 0;
1774 rev_argv[rev_argc++] = NULL;
1775 rev_argv[rev_argc++] = "--left-right";
1776 rev_argv[rev_argc++] = symmetric;
1777 rev_argv[rev_argc++] = "--";
1778 rev_argv[rev_argc] = NULL;
1779
1780 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1781 strcpy(symmetric + 40, "...");
1782 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1783
1784 init_revisions(&revs, NULL);
1785 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1786 prepare_revision_walk(&revs);
1787
1788 /* ... and count the commits on each side. */
1789 *num_ours = 0;
1790 *num_theirs = 0;
1791 while (1) {
1792 struct commit *c = get_revision(&revs);
1793 if (!c)
1794 break;
1795 if (c->object.flags & SYMMETRIC_LEFT)
1796 (*num_ours)++;
1797 else
1798 (*num_theirs)++;
1799 }
1800
1801 /* clear object flags smudged by the above traversal */
1802 clear_commit_marks(ours, ALL_REV_FLAGS);
1803 clear_commit_marks(theirs, ALL_REV_FLAGS);
1804 return 1;
1805 }
1806
1807 /*
1808 * Return true when there is anything to report, otherwise false.
1809 */
1810 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1811 {
1812 int num_ours, num_theirs;
1813 const char *base;
1814
1815 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1816 return 0;
1817
1818 base = branch->merge[0]->dst;
1819 base = shorten_unambiguous_ref(base, 0);
1820 if (!num_theirs) {
1821 strbuf_addf(sb,
1822 Q_("Your branch is ahead of '%s' by %d commit.\n",
1823 "Your branch is ahead of '%s' by %d commits.\n",
1824 num_ours),
1825 base, num_ours);
1826 if (advice_status_hints)
1827 strbuf_addf(sb,
1828 _(" (use \"git push\" to publish your local commits)\n"));
1829 } else if (!num_ours) {
1830 strbuf_addf(sb,
1831 Q_("Your branch is behind '%s' by %d commit, "
1832 "and can be fast-forwarded.\n",
1833 "Your branch is behind '%s' by %d commits, "
1834 "and can be fast-forwarded.\n",
1835 num_theirs),
1836 base, num_theirs);
1837 if (advice_status_hints)
1838 strbuf_addf(sb,
1839 _(" (use \"git pull\" to update your local branch)\n"));
1840 } else {
1841 strbuf_addf(sb,
1842 Q_("Your branch and '%s' have diverged,\n"
1843 "and have %d and %d different commit each, "
1844 "respectively.\n",
1845 "Your branch and '%s' have diverged,\n"
1846 "and have %d and %d different commits each, "
1847 "respectively.\n",
1848 num_theirs),
1849 base, num_ours, num_theirs);
1850 if (advice_status_hints)
1851 strbuf_addf(sb,
1852 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
1853 }
1854 return 1;
1855 }
1856
1857 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1858 {
1859 struct ref ***local_tail = cb_data;
1860 struct ref *ref;
1861 int len;
1862
1863 /* we already know it starts with refs/ to get here */
1864 if (check_refname_format(refname + 5, 0))
1865 return 0;
1866
1867 len = strlen(refname) + 1;
1868 ref = xcalloc(1, sizeof(*ref) + len);
1869 hashcpy(ref->new_sha1, sha1);
1870 memcpy(ref->name, refname, len);
1871 **local_tail = ref;
1872 *local_tail = &ref->next;
1873 return 0;
1874 }
1875
1876 struct ref *get_local_heads(void)
1877 {
1878 struct ref *local_refs = NULL, **local_tail = &local_refs;
1879 for_each_ref(one_local_ref, &local_tail);
1880 return local_refs;
1881 }
1882
1883 struct ref *guess_remote_head(const struct ref *head,
1884 const struct ref *refs,
1885 int all)
1886 {
1887 const struct ref *r;
1888 struct ref *list = NULL;
1889 struct ref **tail = &list;
1890
1891 if (!head)
1892 return NULL;
1893
1894 /*
1895 * Some transports support directly peeking at
1896 * where HEAD points; if that is the case, then
1897 * we don't have to guess.
1898 */
1899 if (head->symref)
1900 return copy_ref(find_ref_by_name(refs, head->symref));
1901
1902 /* If refs/heads/master could be right, it is. */
1903 if (!all) {
1904 r = find_ref_by_name(refs, "refs/heads/master");
1905 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1906 return copy_ref(r);
1907 }
1908
1909 /* Look for another ref that points there */
1910 for (r = refs; r; r = r->next) {
1911 if (r != head &&
1912 !prefixcmp(r->name, "refs/heads/") &&
1913 !hashcmp(r->old_sha1, head->old_sha1)) {
1914 *tail = copy_ref(r);
1915 tail = &((*tail)->next);
1916 if (!all)
1917 break;
1918 }
1919 }
1920
1921 return list;
1922 }
1923
1924 struct stale_heads_info {
1925 struct string_list *ref_names;
1926 struct ref **stale_refs_tail;
1927 struct refspec *refs;
1928 int ref_count;
1929 };
1930
1931 static int get_stale_heads_cb(const char *refname,
1932 const unsigned char *sha1, int flags, void *cb_data)
1933 {
1934 struct stale_heads_info *info = cb_data;
1935 struct refspec query;
1936 memset(&query, 0, sizeof(struct refspec));
1937 query.dst = (char *)refname;
1938
1939 if (query_refspecs(info->refs, info->ref_count, &query))
1940 return 0; /* No matches */
1941
1942 /*
1943 * If we did find a suitable refspec and it's not a symref and
1944 * it's not in the list of refs that currently exist in that
1945 * remote we consider it to be stale.
1946 */
1947 if (!((flags & REF_ISSYMREF) ||
1948 string_list_has_string(info->ref_names, query.src))) {
1949 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1950 hashcpy(ref->new_sha1, sha1);
1951 }
1952
1953 free(query.src);
1954 return 0;
1955 }
1956
1957 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
1958 {
1959 struct ref *ref, *stale_refs = NULL;
1960 struct string_list ref_names = STRING_LIST_INIT_NODUP;
1961 struct stale_heads_info info;
1962 info.ref_names = &ref_names;
1963 info.stale_refs_tail = &stale_refs;
1964 info.refs = refs;
1965 info.ref_count = ref_count;
1966 for (ref = fetch_map; ref; ref = ref->next)
1967 string_list_append(&ref_names, ref->name);
1968 sort_string_list(&ref_names);
1969 for_each_ref(get_stale_heads_cb, &info);
1970 string_list_clear(&ref_names, 0);
1971 return stale_refs;
1972 }
1973
1974 /*
1975 * Compare-and-swap
1976 */
1977 void clear_cas_option(struct push_cas_option *cas)
1978 {
1979 int i;
1980
1981 for (i = 0; i < cas->nr; i++)
1982 free(cas->entry[i].refname);
1983 free(cas->entry);
1984 memset(cas, 0, sizeof(*cas));
1985 }
1986
1987 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
1988 const char *refname,
1989 size_t refnamelen)
1990 {
1991 struct push_cas *entry;
1992 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
1993 entry = &cas->entry[cas->nr++];
1994 memset(entry, 0, sizeof(*entry));
1995 entry->refname = xmemdupz(refname, refnamelen);
1996 return entry;
1997 }
1998
1999 int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2000 {
2001 const char *colon;
2002 struct push_cas *entry;
2003
2004 if (unset) {
2005 /* "--no-<option>" */
2006 clear_cas_option(cas);
2007 return 0;
2008 }
2009
2010 if (!arg) {
2011 /* just "--<option>" */
2012 cas->use_tracking_for_rest = 1;
2013 return 0;
2014 }
2015
2016 /* "--<option>=refname" or "--<option>=refname:value" */
2017 colon = strchrnul(arg, ':');
2018 entry = add_cas_entry(cas, arg, colon - arg);
2019 if (!*colon)
2020 entry->use_tracking = 1;
2021 else if (get_sha1(colon + 1, entry->expect))
2022 return error("cannot parse expected object name '%s'", colon + 1);
2023 return 0;
2024 }
2025
2026 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2027 {
2028 return parse_push_cas_option(opt->value, arg, unset);
2029 }
2030
2031 int is_empty_cas(const struct push_cas_option *cas)
2032 {
2033 return !cas->use_tracking_for_rest && !cas->nr;
2034 }
2035
2036 /*
2037 * Look at remote.fetch refspec and see if we have a remote
2038 * tracking branch for the refname there. Fill its current
2039 * value in sha1[].
2040 * If we cannot do so, return negative to signal an error.
2041 */
2042 static int remote_tracking(struct remote *remote, const char *refname,
2043 unsigned char sha1[20])
2044 {
2045 char *dst;
2046
2047 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2048 if (!dst)
2049 return -1; /* no tracking ref for refname at remote */
2050 if (read_ref(dst, sha1))
2051 return -1; /* we know what the tracking ref is but we cannot read it */
2052 return 0;
2053 }
2054
2055 static void apply_cas(struct push_cas_option *cas,
2056 struct remote *remote,
2057 struct ref *ref)
2058 {
2059 int i;
2060
2061 /* Find an explicit --<option>=<name>[:<value>] entry */
2062 for (i = 0; i < cas->nr; i++) {
2063 struct push_cas *entry = &cas->entry[i];
2064 if (!refname_match(entry->refname, ref->name, ref_rev_parse_rules))
2065 continue;
2066 ref->expect_old_sha1 = 1;
2067 if (!entry->use_tracking)
2068 hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
2069 else if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2070 ref->expect_old_no_trackback = 1;
2071 return;
2072 }
2073
2074 /* Are we using "--<option>" to cover all? */
2075 if (!cas->use_tracking_for_rest)
2076 return;
2077
2078 ref->expect_old_sha1 = 1;
2079 if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2080 ref->expect_old_no_trackback = 1;
2081 }
2082
2083 void apply_push_cas(struct push_cas_option *cas,
2084 struct remote *remote,
2085 struct ref *remote_refs)
2086 {
2087 struct ref *ref;
2088 for (ref = remote_refs; ref; ref = ref->next)
2089 apply_cas(cas, remote, ref);
2090 }
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