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Windows: do not treat a path with backslashes as a remote's nick name
[git/git-svn.git] / remote.c
blob1949882c10a05a1f53b711f6cd3f3e083ca27393
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 #include "argv-array.h"
12
13 enum map_direction { FROM_SRC, FROM_DST };
14
15 static struct refspec s_tag_refspec = {
16 0,
17 1,
18 0,
19 0,
20 "refs/tags/*",
21 "refs/tags/*"
22 };
23
24 const struct refspec *tag_refspec = &s_tag_refspec;
25
26 struct counted_string {
27 size_t len;
28 const char *s;
29 };
30 struct rewrite {
31 const char *base;
32 size_t baselen;
33 struct counted_string *instead_of;
34 int instead_of_nr;
35 int instead_of_alloc;
36 };
37 struct rewrites {
38 struct rewrite **rewrite;
39 int rewrite_alloc;
40 int rewrite_nr;
41 };
42
43 static struct remote **remotes;
44 static int remotes_alloc;
45 static int remotes_nr;
46 static struct hashmap remotes_hash;
47
48 static struct branch **branches;
49 static int branches_alloc;
50 static int branches_nr;
51
52 static struct branch *current_branch;
53 static const char *pushremote_name;
54
55 static struct rewrites rewrites;
56 static struct rewrites rewrites_push;
57
58 static int valid_remote(const struct remote *remote)
59 {
60 return (!!remote->url) || (!!remote->foreign_vcs);
61 }
62
63 static const char *alias_url(const char *url, struct rewrites *r)
64 {
65 int i, j;
66 struct counted_string *longest;
67 int longest_i;
68
69 longest = NULL;
70 longest_i = -1;
71 for (i = 0; i < r->rewrite_nr; i++) {
72 if (!r->rewrite[i])
73 continue;
74 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
75 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
76 (!longest ||
77 longest->len < r->rewrite[i]->instead_of[j].len)) {
78 longest = &(r->rewrite[i]->instead_of[j]);
79 longest_i = i;
80 }
81 }
82 }
83 if (!longest)
84 return url;
85
86 return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
87 }
88
89 static void add_push_refspec(struct remote *remote, const char *ref)
90 {
91 ALLOC_GROW(remote->push_refspec,
92 remote->push_refspec_nr + 1,
93 remote->push_refspec_alloc);
94 remote->push_refspec[remote->push_refspec_nr++] = ref;
95 }
96
97 static void add_fetch_refspec(struct remote *remote, const char *ref)
98 {
99 ALLOC_GROW(remote->fetch_refspec,
100 remote->fetch_refspec_nr + 1,
101 remote->fetch_refspec_alloc);
102 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
103 }
104
105 static void add_url(struct remote *remote, const char *url)
106 {
107 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
108 remote->url[remote->url_nr++] = url;
109 }
110
111 static void add_pushurl(struct remote *remote, const char *pushurl)
112 {
113 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
114 remote->pushurl[remote->pushurl_nr++] = pushurl;
115 }
116
117 static void add_pushurl_alias(struct remote *remote, const char *url)
118 {
119 const char *pushurl = alias_url(url, &rewrites_push);
120 if (pushurl != url)
121 add_pushurl(remote, pushurl);
122 }
123
124 static void add_url_alias(struct remote *remote, const char *url)
125 {
126 add_url(remote, alias_url(url, &rewrites));
127 add_pushurl_alias(remote, url);
128 }
129
130 struct remotes_hash_key {
131 const char *str;
132 int len;
133 };
134
135 static int remotes_hash_cmp(const struct remote *a, const struct remote *b, const struct remotes_hash_key *key)
136 {
137 if (key)
138 return strncmp(a->name, key->str, key->len) || a->name[key->len];
139 else
140 return strcmp(a->name, b->name);
141 }
142
143 static inline void init_remotes_hash(void)
144 {
145 if (!remotes_hash.cmpfn)
146 hashmap_init(&remotes_hash, (hashmap_cmp_fn)remotes_hash_cmp, 0);
147 }
148
149 static struct remote *make_remote(const char *name, int len)
150 {
151 struct remote *ret, *replaced;
152 struct remotes_hash_key lookup;
153 struct hashmap_entry lookup_entry;
154
155 if (!len)
156 len = strlen(name);
157
158 init_remotes_hash();
159 lookup.str = name;
160 lookup.len = len;
161 hashmap_entry_init(&lookup_entry, memhash(name, len));
162
163 if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
164 return ret;
165
166 ret = xcalloc(1, sizeof(struct remote));
167 ret->prune = -1; /* unspecified */
168 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
169 remotes[remotes_nr++] = ret;
170 ret->name = xstrndup(name, len);
171
172 hashmap_entry_init(ret, lookup_entry.hash);
173 replaced = hashmap_put(&remotes_hash, ret);
174 assert(replaced == NULL); /* no previous entry overwritten */
175 return ret;
176 }
177
178 static void add_merge(struct branch *branch, const char *name)
179 {
180 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
181 branch->merge_alloc);
182 branch->merge_name[branch->merge_nr++] = name;
183 }
184
185 static struct branch *make_branch(const char *name, int len)
186 {
187 struct branch *ret;
188 int i;
189
190 for (i = 0; i < branches_nr; i++) {
191 if (len ? (!strncmp(name, branches[i]->name, len) &&
192 !branches[i]->name[len]) :
193 !strcmp(name, branches[i]->name))
194 return branches[i];
195 }
196
197 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
198 ret = xcalloc(1, sizeof(struct branch));
199 branches[branches_nr++] = ret;
200 if (len)
201 ret->name = xstrndup(name, len);
202 else
203 ret->name = xstrdup(name);
204 ret->refname = xstrfmt("refs/heads/%s", ret->name);
205
206 return ret;
207 }
208
209 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
210 {
211 struct rewrite *ret;
212 int i;
213
214 for (i = 0; i < r->rewrite_nr; i++) {
215 if (len
216 ? (len == r->rewrite[i]->baselen &&
217 !strncmp(base, r->rewrite[i]->base, len))
218 : !strcmp(base, r->rewrite[i]->base))
219 return r->rewrite[i];
220 }
221
222 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
223 ret = xcalloc(1, sizeof(struct rewrite));
224 r->rewrite[r->rewrite_nr++] = ret;
225 if (len) {
226 ret->base = xstrndup(base, len);
227 ret->baselen = len;
228 }
229 else {
230 ret->base = xstrdup(base);
231 ret->baselen = strlen(base);
232 }
233 return ret;
234 }
235
236 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
237 {
238 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
239 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
240 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
241 rewrite->instead_of_nr++;
242 }
243
244 static const char *skip_spaces(const char *s)
245 {
246 while (isspace(*s))
247 s++;
248 return s;
249 }
250
251 static void read_remotes_file(struct remote *remote)
252 {
253 struct strbuf buf = STRBUF_INIT;
254 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
255
256 if (!f)
257 return;
258 remote->origin = REMOTE_REMOTES;
259 while (strbuf_getline(&buf, f) != EOF) {
260 const char *v;
261
262 strbuf_rtrim(&buf);
263
264 if (skip_prefix(buf.buf, "URL:", &v))
265 add_url_alias(remote, xstrdup(skip_spaces(v)));
266 else if (skip_prefix(buf.buf, "Push:", &v))
267 add_push_refspec(remote, xstrdup(skip_spaces(v)));
268 else if (skip_prefix(buf.buf, "Pull:", &v))
269 add_fetch_refspec(remote, xstrdup(skip_spaces(v)));
270 }
271 strbuf_release(&buf);
272 fclose(f);
273 }
274
275 static void read_branches_file(struct remote *remote)
276 {
277 char *frag;
278 struct strbuf buf = STRBUF_INIT;
279 FILE *f = fopen(git_path("branches/%s", remote->name), "r");
280
281 if (!f)
282 return;
283
284 strbuf_getline_lf(&buf, f);
285 fclose(f);
286 strbuf_trim(&buf);
287 if (!buf.len) {
288 strbuf_release(&buf);
289 return;
290 }
291
292 remote->origin = REMOTE_BRANCHES;
293
294 /*
295 * The branches file would have URL and optionally
296 * #branch specified. The "master" (or specified) branch is
297 * fetched and stored in the local branch matching the
298 * remote name.
299 */
300 frag = strchr(buf.buf, '#');
301 if (frag)
302 *(frag++) = '\0';
303 else
304 frag = "master";
305
306 add_url_alias(remote, strbuf_detach(&buf, NULL));
307 add_fetch_refspec(remote, xstrfmt("refs/heads/%s:refs/heads/%s",
308 frag, remote->name));
309
310 /*
311 * Cogito compatible push: push current HEAD to remote #branch
312 * (master if missing)
313 */
314 add_push_refspec(remote, xstrfmt("HEAD:refs/heads/%s", frag));
315 remote->fetch_tags = 1; /* always auto-follow */
316 }
317
318 static int handle_config(const char *key, const char *value, void *cb)
319 {
320 const char *name;
321 int namelen;
322 const char *subkey;
323 struct remote *remote;
324 struct branch *branch;
325 if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
326 if (!name)
327 return 0;
328 branch = make_branch(name, namelen);
329 if (!strcmp(subkey, "remote")) {
330 return git_config_string(&branch->remote_name, key, value);
331 } else if (!strcmp(subkey, "pushremote")) {
332 return git_config_string(&branch->pushremote_name, key, value);
333 } else if (!strcmp(subkey, "merge")) {
334 if (!value)
335 return config_error_nonbool(key);
336 add_merge(branch, xstrdup(value));
337 }
338 return 0;
339 }
340 if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
341 struct rewrite *rewrite;
342 if (!name)
343 return 0;
344 if (!strcmp(subkey, "insteadof")) {
345 rewrite = make_rewrite(&rewrites, name, namelen);
346 if (!value)
347 return config_error_nonbool(key);
348 add_instead_of(rewrite, xstrdup(value));
349 } else if (!strcmp(subkey, "pushinsteadof")) {
350 rewrite = make_rewrite(&rewrites_push, name, namelen);
351 if (!value)
352 return config_error_nonbool(key);
353 add_instead_of(rewrite, xstrdup(value));
354 }
355 }
356
357 if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
358 return 0;
359
360 /* Handle remote.* variables */
361 if (!name && !strcmp(subkey, "pushdefault"))
362 return git_config_string(&pushremote_name, key, value);
363
364 if (!name)
365 return 0;
366 /* Handle remote.<name>.* variables */
367 if (*name == '/') {
368 warning("Config remote shorthand cannot begin with '/': %s",
369 name);
370 return 0;
371 }
372 remote = make_remote(name, namelen);
373 remote->origin = REMOTE_CONFIG;
374 if (!strcmp(subkey, "mirror"))
375 remote->mirror = git_config_bool(key, value);
376 else if (!strcmp(subkey, "skipdefaultupdate"))
377 remote->skip_default_update = git_config_bool(key, value);
378 else if (!strcmp(subkey, "skipfetchall"))
379 remote->skip_default_update = git_config_bool(key, value);
380 else if (!strcmp(subkey, "prune"))
381 remote->prune = git_config_bool(key, value);
382 else if (!strcmp(subkey, "url")) {
383 const char *v;
384 if (git_config_string(&v, key, value))
385 return -1;
386 add_url(remote, v);
387 } else if (!strcmp(subkey, "pushurl")) {
388 const char *v;
389 if (git_config_string(&v, key, value))
390 return -1;
391 add_pushurl(remote, v);
392 } else if (!strcmp(subkey, "push")) {
393 const char *v;
394 if (git_config_string(&v, key, value))
395 return -1;
396 add_push_refspec(remote, v);
397 } else if (!strcmp(subkey, "fetch")) {
398 const char *v;
399 if (git_config_string(&v, key, value))
400 return -1;
401 add_fetch_refspec(remote, v);
402 } else if (!strcmp(subkey, "receivepack")) {
403 const char *v;
404 if (git_config_string(&v, key, value))
405 return -1;
406 if (!remote->receivepack)
407 remote->receivepack = v;
408 else
409 error("more than one receivepack given, using the first");
410 } else if (!strcmp(subkey, "uploadpack")) {
411 const char *v;
412 if (git_config_string(&v, key, value))
413 return -1;
414 if (!remote->uploadpack)
415 remote->uploadpack = v;
416 else
417 error("more than one uploadpack given, using the first");
418 } else if (!strcmp(subkey, "tagopt")) {
419 if (!strcmp(value, "--no-tags"))
420 remote->fetch_tags = -1;
421 else if (!strcmp(value, "--tags"))
422 remote->fetch_tags = 2;
423 } else if (!strcmp(subkey, "proxy")) {
424 return git_config_string((const char **)&remote->http_proxy,
425 key, value);
426 } else if (!strcmp(subkey, "proxyauthmethod")) {
427 return git_config_string((const char **)&remote->http_proxy_authmethod,
428 key, value);
429 } else if (!strcmp(subkey, "vcs")) {
430 return git_config_string(&remote->foreign_vcs, key, value);
431 }
432 return 0;
433 }
434
435 static void alias_all_urls(void)
436 {
437 int i, j;
438 for (i = 0; i < remotes_nr; i++) {
439 int add_pushurl_aliases;
440 if (!remotes[i])
441 continue;
442 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
443 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
444 }
445 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
446 for (j = 0; j < remotes[i]->url_nr; j++) {
447 if (add_pushurl_aliases)
448 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
449 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
450 }
451 }
452 }
453
454 static void read_config(void)
455 {
456 static int loaded;
457 struct object_id oid;
458 int flag;
459
460 if (loaded)
461 return;
462 loaded = 1;
463
464 current_branch = NULL;
465 if (startup_info->have_repository) {
466 const char *head_ref = resolve_ref_unsafe("HEAD", 0, oid.hash, &flag);
467 if (head_ref && (flag & REF_ISSYMREF) &&
468 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
469 current_branch = make_branch(head_ref, 0);
470 }
471 }
472 git_config(handle_config, NULL);
473 alias_all_urls();
474 }
475
476 /*
477 * This function frees a refspec array.
478 * Warning: code paths should be checked to ensure that the src
479 * and dst pointers are always freeable pointers as well
480 * as the refspec pointer itself.
481 */
482 static void free_refspecs(struct refspec *refspec, int nr_refspec)
483 {
484 int i;
485
486 if (!refspec)
487 return;
488
489 for (i = 0; i < nr_refspec; i++) {
490 free(refspec[i].src);
491 free(refspec[i].dst);
492 }
493 free(refspec);
494 }
495
496 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
497 {
498 int i;
499 struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
500
501 for (i = 0; i < nr_refspec; i++) {
502 size_t llen;
503 int is_glob;
504 const char *lhs, *rhs;
505 int flags;
506
507 is_glob = 0;
508
509 lhs = refspec[i];
510 if (*lhs == '+') {
511 rs[i].force = 1;
512 lhs++;
513 }
514
515 rhs = strrchr(lhs, ':');
516
517 /*
518 * Before going on, special case ":" (or "+:") as a refspec
519 * for pushing matching refs.
520 */
521 if (!fetch && rhs == lhs && rhs[1] == '\0') {
522 rs[i].matching = 1;
523 continue;
524 }
525
526 if (rhs) {
527 size_t rlen = strlen(++rhs);
528 is_glob = (1 <= rlen && strchr(rhs, '*'));
529 rs[i].dst = xstrndup(rhs, rlen);
530 }
531
532 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
533 if (1 <= llen && memchr(lhs, '*', llen)) {
534 if ((rhs && !is_glob) || (!rhs && fetch))
535 goto invalid;
536 is_glob = 1;
537 } else if (rhs && is_glob) {
538 goto invalid;
539 }
540
541 rs[i].pattern = is_glob;
542 rs[i].src = xstrndup(lhs, llen);
543 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
544
545 if (fetch) {
546 struct object_id unused;
547
548 /* LHS */
549 if (!*rs[i].src)
550 ; /* empty is ok; it means "HEAD" */
551 else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(rs[i].src, &unused))
552 rs[i].exact_sha1 = 1; /* ok */
553 else if (!check_refname_format(rs[i].src, flags))
554 ; /* valid looking ref is ok */
555 else
556 goto invalid;
557 /* RHS */
558 if (!rs[i].dst)
559 ; /* missing is ok; it is the same as empty */
560 else if (!*rs[i].dst)
561 ; /* empty is ok; it means "do not store" */
562 else if (!check_refname_format(rs[i].dst, flags))
563 ; /* valid looking ref is ok */
564 else
565 goto invalid;
566 } else {
567 /*
568 * LHS
569 * - empty is allowed; it means delete.
570 * - when wildcarded, it must be a valid looking ref.
571 * - otherwise, it must be an extended SHA-1, but
572 * there is no existing way to validate this.
573 */
574 if (!*rs[i].src)
575 ; /* empty is ok */
576 else if (is_glob) {
577 if (check_refname_format(rs[i].src, flags))
578 goto invalid;
579 }
580 else
581 ; /* anything goes, for now */
582 /*
583 * RHS
584 * - missing is allowed, but LHS then must be a
585 * valid looking ref.
586 * - empty is not allowed.
587 * - otherwise it must be a valid looking ref.
588 */
589 if (!rs[i].dst) {
590 if (check_refname_format(rs[i].src, flags))
591 goto invalid;
592 } else if (!*rs[i].dst) {
593 goto invalid;
594 } else {
595 if (check_refname_format(rs[i].dst, flags))
596 goto invalid;
597 }
598 }
599 }
600 return rs;
601
602 invalid:
603 if (verify) {
604 /*
605 * nr_refspec must be greater than zero and i must be valid
606 * since it is only possible to reach this point from within
607 * the for loop above.
608 */
609 free_refspecs(rs, i+1);
610 return NULL;
611 }
612 die("Invalid refspec '%s'", refspec[i]);
613 }
614
615 int valid_fetch_refspec(const char *fetch_refspec_str)
616 {
617 struct refspec *refspec;
618
619 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
620 free_refspecs(refspec, 1);
621 return !!refspec;
622 }
623
624 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
625 {
626 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
627 }
628
629 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
630 {
631 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
632 }
633
634 void free_refspec(int nr_refspec, struct refspec *refspec)
635 {
636 int i;
637 for (i = 0; i < nr_refspec; i++) {
638 free(refspec[i].src);
639 free(refspec[i].dst);
640 }
641 free(refspec);
642 }
643
644 static int valid_remote_nick(const char *name)
645 {
646 if (!name[0] || is_dot_or_dotdot(name))
647 return 0;
648
649 /* remote nicknames cannot contain slashes */
650 while (*name)
651 if (is_dir_sep(*name++))
652 return 0;
653 return 1;
654 }
655
656 const char *remote_for_branch(struct branch *branch, int *explicit)
657 {
658 if (branch && branch->remote_name) {
659 if (explicit)
660 *explicit = 1;
661 return branch->remote_name;
662 }
663 if (explicit)
664 *explicit = 0;
665 return "origin";
666 }
667
668 const char *pushremote_for_branch(struct branch *branch, int *explicit)
669 {
670 if (branch && branch->pushremote_name) {
671 if (explicit)
672 *explicit = 1;
673 return branch->pushremote_name;
674 }
675 if (pushremote_name) {
676 if (explicit)
677 *explicit = 1;
678 return pushremote_name;
679 }
680 return remote_for_branch(branch, explicit);
681 }
682
683 static struct remote *remote_get_1(const char *name,
684 const char *(*get_default)(struct branch *, int *))
685 {
686 struct remote *ret;
687 int name_given = 0;
688
689 read_config();
690
691 if (name)
692 name_given = 1;
693 else
694 name = get_default(current_branch, &name_given);
695
696 ret = make_remote(name, 0);
697 if (valid_remote_nick(name)) {
698 if (!valid_remote(ret))
699 read_remotes_file(ret);
700 if (!valid_remote(ret))
701 read_branches_file(ret);
702 }
703 if (name_given && !valid_remote(ret))
704 add_url_alias(ret, name);
705 if (!valid_remote(ret))
706 return NULL;
707 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
708 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
709 return ret;
710 }
711
712 struct remote *remote_get(const char *name)
713 {
714 return remote_get_1(name, remote_for_branch);
715 }
716
717 struct remote *pushremote_get(const char *name)
718 {
719 return remote_get_1(name, pushremote_for_branch);
720 }
721
722 int remote_is_configured(struct remote *remote)
723 {
724 return remote && remote->origin;
725 }
726
727 int for_each_remote(each_remote_fn fn, void *priv)
728 {
729 int i, result = 0;
730 read_config();
731 for (i = 0; i < remotes_nr && !result; i++) {
732 struct remote *r = remotes[i];
733 if (!r)
734 continue;
735 if (!r->fetch)
736 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
737 r->fetch_refspec);
738 if (!r->push)
739 r->push = parse_push_refspec(r->push_refspec_nr,
740 r->push_refspec);
741 result = fn(r, priv);
742 }
743 return result;
744 }
745
746 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
747 {
748 if (strcmp(ref1->name, ref2->name)) {
749 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
750 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
751 die(_("Cannot fetch both %s and %s to %s"),
752 ref1->name, ref2->name, ref2->peer_ref->name);
753 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
754 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
755 warning(_("%s usually tracks %s, not %s"),
756 ref2->peer_ref->name, ref2->name, ref1->name);
757 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
758 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
759 die(_("%s tracks both %s and %s"),
760 ref2->peer_ref->name, ref1->name, ref2->name);
761 } else {
762 /*
763 * This last possibility doesn't occur because
764 * FETCH_HEAD_IGNORE entries always appear at
765 * the end of the list.
766 */
767 die(_("Internal error"));
768 }
769 }
770 free(ref2->peer_ref);
771 free(ref2);
772 }
773
774 struct ref *ref_remove_duplicates(struct ref *ref_map)
775 {
776 struct string_list refs = STRING_LIST_INIT_NODUP;
777 struct ref *retval = NULL;
778 struct ref **p = &retval;
779
780 while (ref_map) {
781 struct ref *ref = ref_map;
782
783 ref_map = ref_map->next;
784 ref->next = NULL;
785
786 if (!ref->peer_ref) {
787 *p = ref;
788 p = &ref->next;
789 } else {
790 struct string_list_item *item =
791 string_list_insert(&refs, ref->peer_ref->name);
792
793 if (item->util) {
794 /* Entry already existed */
795 handle_duplicate((struct ref *)item->util, ref);
796 } else {
797 *p = ref;
798 p = &ref->next;
799 item->util = ref;
800 }
801 }
802 }
803
804 string_list_clear(&refs, 0);
805 return retval;
806 }
807
808 int remote_has_url(struct remote *remote, const char *url)
809 {
810 int i;
811 for (i = 0; i < remote->url_nr; i++) {
812 if (!strcmp(remote->url[i], url))
813 return 1;
814 }
815 return 0;
816 }
817
818 static int match_name_with_pattern(const char *key, const char *name,
819 const char *value, char **result)
820 {
821 const char *kstar = strchr(key, '*');
822 size_t klen;
823 size_t ksuffixlen;
824 size_t namelen;
825 int ret;
826 if (!kstar)
827 die("Key '%s' of pattern had no '*'", key);
828 klen = kstar - key;
829 ksuffixlen = strlen(kstar + 1);
830 namelen = strlen(name);
831 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
832 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
833 if (ret && value) {
834 struct strbuf sb = STRBUF_INIT;
835 const char *vstar = strchr(value, '*');
836 if (!vstar)
837 die("Value '%s' of pattern has no '*'", value);
838 strbuf_add(&sb, value, vstar - value);
839 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
840 strbuf_addstr(&sb, vstar + 1);
841 *result = strbuf_detach(&sb, NULL);
842 }
843 return ret;
844 }
845
846 static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
847 {
848 int i;
849 int find_src = !query->src;
850
851 if (find_src && !query->dst)
852 error("query_refspecs_multiple: need either src or dst");
853
854 for (i = 0; i < ref_count; i++) {
855 struct refspec *refspec = &refs[i];
856 const char *key = find_src ? refspec->dst : refspec->src;
857 const char *value = find_src ? refspec->src : refspec->dst;
858 const char *needle = find_src ? query->dst : query->src;
859 char **result = find_src ? &query->src : &query->dst;
860
861 if (!refspec->dst)
862 continue;
863 if (refspec->pattern) {
864 if (match_name_with_pattern(key, needle, value, result))
865 string_list_append_nodup(results, *result);
866 } else if (!strcmp(needle, key)) {
867 string_list_append(results, value);
868 }
869 }
870 }
871
872 int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
873 {
874 int i;
875 int find_src = !query->src;
876 const char *needle = find_src ? query->dst : query->src;
877 char **result = find_src ? &query->src : &query->dst;
878
879 if (find_src && !query->dst)
880 return error("query_refspecs: need either src or dst");
881
882 for (i = 0; i < ref_count; i++) {
883 struct refspec *refspec = &refs[i];
884 const char *key = find_src ? refspec->dst : refspec->src;
885 const char *value = find_src ? refspec->src : refspec->dst;
886
887 if (!refspec->dst)
888 continue;
889 if (refspec->pattern) {
890 if (match_name_with_pattern(key, needle, value, result)) {
891 query->force = refspec->force;
892 return 0;
893 }
894 } else if (!strcmp(needle, key)) {
895 *result = xstrdup(value);
896 query->force = refspec->force;
897 return 0;
898 }
899 }
900 return -1;
901 }
902
903 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
904 const char *name)
905 {
906 struct refspec query;
907
908 memset(&query, 0, sizeof(struct refspec));
909 query.src = (char *)name;
910
911 if (query_refspecs(refspecs, nr_refspec, &query))
912 return NULL;
913
914 return query.dst;
915 }
916
917 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
918 {
919 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
920 }
921
922 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
923 const char *name)
924 {
925 size_t len = strlen(name);
926 struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
927 memcpy(ref->name, prefix, prefixlen);
928 memcpy(ref->name + prefixlen, name, len);
929 return ref;
930 }
931
932 struct ref *alloc_ref(const char *name)
933 {
934 return alloc_ref_with_prefix("", 0, name);
935 }
936
937 struct ref *copy_ref(const struct ref *ref)
938 {
939 struct ref *cpy;
940 size_t len;
941 if (!ref)
942 return NULL;
943 len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
944 cpy = xmalloc(len);
945 memcpy(cpy, ref, len);
946 cpy->next = NULL;
947 cpy->symref = xstrdup_or_null(ref->symref);
948 cpy->remote_status = xstrdup_or_null(ref->remote_status);
949 cpy->peer_ref = copy_ref(ref->peer_ref);
950 return cpy;
951 }
952
953 struct ref *copy_ref_list(const struct ref *ref)
954 {
955 struct ref *ret = NULL;
956 struct ref **tail = &ret;
957 while (ref) {
958 *tail = copy_ref(ref);
959 ref = ref->next;
960 tail = &((*tail)->next);
961 }
962 return ret;
963 }
964
965 static void free_ref(struct ref *ref)
966 {
967 if (!ref)
968 return;
969 free_ref(ref->peer_ref);
970 free(ref->remote_status);
971 free(ref->symref);
972 free(ref);
973 }
974
975 void free_refs(struct ref *ref)
976 {
977 struct ref *next;
978 while (ref) {
979 next = ref->next;
980 free_ref(ref);
981 ref = next;
982 }
983 }
984
985 int ref_compare_name(const void *va, const void *vb)
986 {
987 const struct ref *a = va, *b = vb;
988 return strcmp(a->name, b->name);
989 }
990
991 static void *ref_list_get_next(const void *a)
992 {
993 return ((const struct ref *)a)->next;
994 }
995
996 static void ref_list_set_next(void *a, void *next)
997 {
998 ((struct ref *)a)->next = next;
999 }
1000
1001 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1002 {
1003 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1004 }
1005
1006 int count_refspec_match(const char *pattern,
1007 struct ref *refs,
1008 struct ref **matched_ref)
1009 {
1010 int patlen = strlen(pattern);
1011 struct ref *matched_weak = NULL;
1012 struct ref *matched = NULL;
1013 int weak_match = 0;
1014 int match = 0;
1015
1016 for (weak_match = match = 0; refs; refs = refs->next) {
1017 char *name = refs->name;
1018 int namelen = strlen(name);
1019
1020 if (!refname_match(pattern, name))
1021 continue;
1022
1023 /* A match is "weak" if it is with refs outside
1024 * heads or tags, and did not specify the pattern
1025 * in full (e.g. "refs/remotes/origin/master") or at
1026 * least from the toplevel (e.g. "remotes/origin/master");
1027 * otherwise "git push $URL master" would result in
1028 * ambiguity between remotes/origin/master and heads/master
1029 * at the remote site.
1030 */
1031 if (namelen != patlen &&
1032 patlen != namelen - 5 &&
1033 !starts_with(name, "refs/heads/") &&
1034 !starts_with(name, "refs/tags/")) {
1035 /* We want to catch the case where only weak
1036 * matches are found and there are multiple
1037 * matches, and where more than one strong
1038 * matches are found, as ambiguous. One
1039 * strong match with zero or more weak matches
1040 * are acceptable as a unique match.
1041 */
1042 matched_weak = refs;
1043 weak_match++;
1044 }
1045 else {
1046 matched = refs;
1047 match++;
1048 }
1049 }
1050 if (!matched) {
1051 if (matched_ref)
1052 *matched_ref = matched_weak;
1053 return weak_match;
1054 }
1055 else {
1056 if (matched_ref)
1057 *matched_ref = matched;
1058 return match;
1059 }
1060 }
1061
1062 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1063 {
1064 **tail = ref;
1065 while (ref->next)
1066 ref = ref->next;
1067 *tail = &ref->next;
1068 }
1069
1070 static struct ref *alloc_delete_ref(void)
1071 {
1072 struct ref *ref = alloc_ref("(delete)");
1073 oidclr(&ref->new_oid);
1074 return ref;
1075 }
1076
1077 static int try_explicit_object_name(const char *name,
1078 struct ref **match)
1079 {
1080 struct object_id oid;
1081
1082 if (!*name) {
1083 if (match)
1084 *match = alloc_delete_ref();
1085 return 0;
1086 }
1087
1088 if (get_sha1(name, oid.hash))
1089 return -1;
1090
1091 if (match) {
1092 *match = alloc_ref(name);
1093 oidcpy(&(*match)->new_oid, &oid);
1094 }
1095 return 0;
1096 }
1097
1098 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1099 {
1100 struct ref *ret = alloc_ref(name);
1101 tail_link_ref(ret, tail);
1102 return ret;
1103 }
1104
1105 static char *guess_ref(const char *name, struct ref *peer)
1106 {
1107 struct strbuf buf = STRBUF_INIT;
1108 struct object_id oid;
1109
1110 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1111 oid.hash, NULL);
1112 if (!r)
1113 return NULL;
1114
1115 if (starts_with(r, "refs/heads/"))
1116 strbuf_addstr(&buf, "refs/heads/");
1117 else if (starts_with(r, "refs/tags/"))
1118 strbuf_addstr(&buf, "refs/tags/");
1119 else
1120 return NULL;
1121
1122 strbuf_addstr(&buf, name);
1123 return strbuf_detach(&buf, NULL);
1124 }
1125
1126 static int match_explicit_lhs(struct ref *src,
1127 struct refspec *rs,
1128 struct ref **match,
1129 int *allocated_match)
1130 {
1131 switch (count_refspec_match(rs->src, src, match)) {
1132 case 1:
1133 if (allocated_match)
1134 *allocated_match = 0;
1135 return 0;
1136 case 0:
1137 /* The source could be in the get_sha1() format
1138 * not a reference name. :refs/other is a
1139 * way to delete 'other' ref at the remote end.
1140 */
1141 if (try_explicit_object_name(rs->src, match) < 0)
1142 return error("src refspec %s does not match any.", rs->src);
1143 if (allocated_match)
1144 *allocated_match = 1;
1145 return 0;
1146 default:
1147 return error("src refspec %s matches more than one.", rs->src);
1148 }
1149 }
1150
1151 static int match_explicit(struct ref *src, struct ref *dst,
1152 struct ref ***dst_tail,
1153 struct refspec *rs)
1154 {
1155 struct ref *matched_src, *matched_dst;
1156 int allocated_src;
1157
1158 const char *dst_value = rs->dst;
1159 char *dst_guess;
1160
1161 if (rs->pattern || rs->matching)
1162 return 0;
1163
1164 matched_src = matched_dst = NULL;
1165 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1166 return -1;
1167
1168 if (!dst_value) {
1169 struct object_id oid;
1170 int flag;
1171
1172 dst_value = resolve_ref_unsafe(matched_src->name,
1173 RESOLVE_REF_READING,
1174 oid.hash, &flag);
1175 if (!dst_value ||
1176 ((flag & REF_ISSYMREF) &&
1177 !starts_with(dst_value, "refs/heads/")))
1178 die("%s cannot be resolved to branch.",
1179 matched_src->name);
1180 }
1181
1182 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1183 case 1:
1184 break;
1185 case 0:
1186 if (starts_with(dst_value, "refs/"))
1187 matched_dst = make_linked_ref(dst_value, dst_tail);
1188 else if (is_null_oid(&matched_src->new_oid))
1189 error("unable to delete '%s': remote ref does not exist",
1190 dst_value);
1191 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1192 matched_dst = make_linked_ref(dst_guess, dst_tail);
1193 else
1194 error("unable to push to unqualified destination: %s\n"
1195 "The destination refspec neither matches an "
1196 "existing ref on the remote nor\n"
1197 "begins with refs/, and we are unable to "
1198 "guess a prefix based on the source ref.",
1199 dst_value);
1200 break;
1201 default:
1202 matched_dst = NULL;
1203 error("dst refspec %s matches more than one.",
1204 dst_value);
1205 break;
1206 }
1207 if (!matched_dst)
1208 return -1;
1209 if (matched_dst->peer_ref)
1210 return error("dst ref %s receives from more than one src.",
1211 matched_dst->name);
1212 else {
1213 matched_dst->peer_ref = allocated_src ?
1214 matched_src :
1215 copy_ref(matched_src);
1216 matched_dst->force = rs->force;
1217 }
1218 return 0;
1219 }
1220
1221 static int match_explicit_refs(struct ref *src, struct ref *dst,
1222 struct ref ***dst_tail, struct refspec *rs,
1223 int rs_nr)
1224 {
1225 int i, errs;
1226 for (i = errs = 0; i < rs_nr; i++)
1227 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1228 return errs;
1229 }
1230
1231 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1232 int send_mirror, int direction, const struct refspec **ret_pat)
1233 {
1234 const struct refspec *pat;
1235 char *name;
1236 int i;
1237 int matching_refs = -1;
1238 for (i = 0; i < rs_nr; i++) {
1239 if (rs[i].matching &&
1240 (matching_refs == -1 || rs[i].force)) {
1241 matching_refs = i;
1242 continue;
1243 }
1244
1245 if (rs[i].pattern) {
1246 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1247 int match;
1248 if (direction == FROM_SRC)
1249 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1250 else
1251 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1252 if (match) {
1253 matching_refs = i;
1254 break;
1255 }
1256 }
1257 }
1258 if (matching_refs == -1)
1259 return NULL;
1260
1261 pat = rs + matching_refs;
1262 if (pat->matching) {
1263 /*
1264 * "matching refs"; traditionally we pushed everything
1265 * including refs outside refs/heads/ hierarchy, but
1266 * that does not make much sense these days.
1267 */
1268 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1269 return NULL;
1270 name = xstrdup(ref->name);
1271 }
1272 if (ret_pat)
1273 *ret_pat = pat;
1274 return name;
1275 }
1276
1277 static struct ref **tail_ref(struct ref **head)
1278 {
1279 struct ref **tail = head;
1280 while (*tail)
1281 tail = &((*tail)->next);
1282 return tail;
1283 }
1284
1285 struct tips {
1286 struct commit **tip;
1287 int nr, alloc;
1288 };
1289
1290 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1291 {
1292 struct commit *commit;
1293
1294 if (is_null_oid(oid))
1295 return;
1296 commit = lookup_commit_reference_gently(oid->hash, 1);
1297 if (!commit || (commit->object.flags & TMP_MARK))
1298 return;
1299 commit->object.flags |= TMP_MARK;
1300 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1301 tips->tip[tips->nr++] = commit;
1302 }
1303
1304 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1305 {
1306 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1307 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1308 struct string_list_item *item;
1309 struct ref *ref;
1310 struct tips sent_tips;
1311
1312 /*
1313 * Collect everything we know they would have at the end of
1314 * this push, and collect all tags they have.
1315 */
1316 memset(&sent_tips, 0, sizeof(sent_tips));
1317 for (ref = *dst; ref; ref = ref->next) {
1318 if (ref->peer_ref &&
1319 !is_null_oid(&ref->peer_ref->new_oid))
1320 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1321 else
1322 add_to_tips(&sent_tips, &ref->old_oid);
1323 if (starts_with(ref->name, "refs/tags/"))
1324 string_list_append(&dst_tag, ref->name);
1325 }
1326 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1327
1328 string_list_sort(&dst_tag);
1329
1330 /* Collect tags they do not have. */
1331 for (ref = src; ref; ref = ref->next) {
1332 if (!starts_with(ref->name, "refs/tags/"))
1333 continue; /* not a tag */
1334 if (string_list_has_string(&dst_tag, ref->name))
1335 continue; /* they already have it */
1336 if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
1337 continue; /* be conservative */
1338 item = string_list_append(&src_tag, ref->name);
1339 item->util = ref;
1340 }
1341 string_list_clear(&dst_tag, 0);
1342
1343 /*
1344 * At this point, src_tag lists tags that are missing from
1345 * dst, and sent_tips lists the tips we are pushing or those
1346 * that we know they already have. An element in the src_tag
1347 * that is an ancestor of any of the sent_tips needs to be
1348 * sent to the other side.
1349 */
1350 if (sent_tips.nr) {
1351 for_each_string_list_item(item, &src_tag) {
1352 struct ref *ref = item->util;
1353 struct ref *dst_ref;
1354 struct commit *commit;
1355
1356 if (is_null_oid(&ref->new_oid))
1357 continue;
1358 commit = lookup_commit_reference_gently(ref->new_oid.hash, 1);
1359 if (!commit)
1360 /* not pushing a commit, which is not an error */
1361 continue;
1362
1363 /*
1364 * Is this tag, which they do not have, reachable from
1365 * any of the commits we are sending?
1366 */
1367 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1368 continue;
1369
1370 /* Add it in */
1371 dst_ref = make_linked_ref(ref->name, dst_tail);
1372 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1373 dst_ref->peer_ref = copy_ref(ref);
1374 }
1375 }
1376 string_list_clear(&src_tag, 0);
1377 free(sent_tips.tip);
1378 }
1379
1380 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1381 {
1382 for ( ; list; list = list->next)
1383 if (!strcmp(list->name, name))
1384 return (struct ref *)list;
1385 return NULL;
1386 }
1387
1388 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1389 {
1390 for ( ; ref; ref = ref->next)
1391 string_list_append_nodup(ref_index, ref->name)->util = ref;
1392
1393 string_list_sort(ref_index);
1394 }
1395
1396 /*
1397 * Given only the set of local refs, sanity-check the set of push
1398 * refspecs. We can't catch all errors that match_push_refs would,
1399 * but we can catch some errors early before even talking to the
1400 * remote side.
1401 */
1402 int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1403 {
1404 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1405 int ret = 0;
1406 int i;
1407
1408 for (i = 0; i < nr_refspec; i++) {
1409 struct refspec *rs = refspec + i;
1410
1411 if (rs->pattern || rs->matching)
1412 continue;
1413
1414 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1415 }
1416
1417 free_refspec(nr_refspec, refspec);
1418 return ret;
1419 }
1420
1421 /*
1422 * Given the set of refs the local repository has, the set of refs the
1423 * remote repository has, and the refspec used for push, determine
1424 * what remote refs we will update and with what value by setting
1425 * peer_ref (which object is being pushed) and force (if the push is
1426 * forced) in elements of "dst". The function may add new elements to
1427 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1428 */
1429 int match_push_refs(struct ref *src, struct ref **dst,
1430 int nr_refspec, const char **refspec, int flags)
1431 {
1432 struct refspec *rs;
1433 int send_all = flags & MATCH_REFS_ALL;
1434 int send_mirror = flags & MATCH_REFS_MIRROR;
1435 int send_prune = flags & MATCH_REFS_PRUNE;
1436 int errs;
1437 static const char *default_refspec[] = { ":", NULL };
1438 struct ref *ref, **dst_tail = tail_ref(dst);
1439 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1440
1441 if (!nr_refspec) {
1442 nr_refspec = 1;
1443 refspec = default_refspec;
1444 }
1445 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1446 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1447
1448 /* pick the remainder */
1449 for (ref = src; ref; ref = ref->next) {
1450 struct string_list_item *dst_item;
1451 struct ref *dst_peer;
1452 const struct refspec *pat = NULL;
1453 char *dst_name;
1454
1455 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1456 if (!dst_name)
1457 continue;
1458
1459 if (!dst_ref_index.nr)
1460 prepare_ref_index(&dst_ref_index, *dst);
1461
1462 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1463 dst_peer = dst_item ? dst_item->util : NULL;
1464 if (dst_peer) {
1465 if (dst_peer->peer_ref)
1466 /* We're already sending something to this ref. */
1467 goto free_name;
1468 } else {
1469 if (pat->matching && !(send_all || send_mirror))
1470 /*
1471 * Remote doesn't have it, and we have no
1472 * explicit pattern, and we don't have
1473 * --all or --mirror.
1474 */
1475 goto free_name;
1476
1477 /* Create a new one and link it */
1478 dst_peer = make_linked_ref(dst_name, &dst_tail);
1479 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1480 string_list_insert(&dst_ref_index,
1481 dst_peer->name)->util = dst_peer;
1482 }
1483 dst_peer->peer_ref = copy_ref(ref);
1484 dst_peer->force = pat->force;
1485 free_name:
1486 free(dst_name);
1487 }
1488
1489 string_list_clear(&dst_ref_index, 0);
1490
1491 if (flags & MATCH_REFS_FOLLOW_TAGS)
1492 add_missing_tags(src, dst, &dst_tail);
1493
1494 if (send_prune) {
1495 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1496 /* check for missing refs on the remote */
1497 for (ref = *dst; ref; ref = ref->next) {
1498 char *src_name;
1499
1500 if (ref->peer_ref)
1501 /* We're already sending something to this ref. */
1502 continue;
1503
1504 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1505 if (src_name) {
1506 if (!src_ref_index.nr)
1507 prepare_ref_index(&src_ref_index, src);
1508 if (!string_list_has_string(&src_ref_index,
1509 src_name))
1510 ref->peer_ref = alloc_delete_ref();
1511 free(src_name);
1512 }
1513 }
1514 string_list_clear(&src_ref_index, 0);
1515 }
1516 if (errs)
1517 return -1;
1518 return 0;
1519 }
1520
1521 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1522 int force_update)
1523 {
1524 struct ref *ref;
1525
1526 for (ref = remote_refs; ref; ref = ref->next) {
1527 int force_ref_update = ref->force || force_update;
1528 int reject_reason = 0;
1529
1530 if (ref->peer_ref)
1531 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1532 else if (!send_mirror)
1533 continue;
1534
1535 ref->deletion = is_null_oid(&ref->new_oid);
1536 if (!ref->deletion &&
1537 !oidcmp(&ref->old_oid, &ref->new_oid)) {
1538 ref->status = REF_STATUS_UPTODATE;
1539 continue;
1540 }
1541
1542 /*
1543 * If the remote ref has moved and is now different
1544 * from what we expect, reject any push.
1545 *
1546 * It also is an error if the user told us to check
1547 * with the remote-tracking branch to find the value
1548 * to expect, but we did not have such a tracking
1549 * branch.
1550 */
1551 if (ref->expect_old_sha1) {
1552 if (oidcmp(&ref->old_oid, &ref->old_oid_expect))
1553 reject_reason = REF_STATUS_REJECT_STALE;
1554 else
1555 /* If the ref isn't stale then force the update. */
1556 force_ref_update = 1;
1557 }
1558
1559 /*
1560 * If the update isn't already rejected then check
1561 * the usual "must fast-forward" rules.
1562 *
1563 * Decide whether an individual refspec A:B can be
1564 * pushed. The push will succeed if any of the
1565 * following are true:
1566 *
1567 * (1) the remote reference B does not exist
1568 *
1569 * (2) the remote reference B is being removed (i.e.,
1570 * pushing :B where no source is specified)
1571 *
1572 * (3) the destination is not under refs/tags/, and
1573 * if the old and new value is a commit, the new
1574 * is a descendant of the old.
1575 *
1576 * (4) it is forced using the +A:B notation, or by
1577 * passing the --force argument
1578 */
1579
1580 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1581 if (starts_with(ref->name, "refs/tags/"))
1582 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1583 else if (!has_object_file(&ref->old_oid))
1584 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1585 else if (!lookup_commit_reference_gently(ref->old_oid.hash, 1) ||
1586 !lookup_commit_reference_gently(ref->new_oid.hash, 1))
1587 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1588 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1589 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1590 }
1591
1592 /*
1593 * "--force" will defeat any rejection implemented
1594 * by the rules above.
1595 */
1596 if (!force_ref_update)
1597 ref->status = reject_reason;
1598 else if (reject_reason)
1599 ref->forced_update = 1;
1600 }
1601 }
1602
1603 static void set_merge(struct branch *ret)
1604 {
1605 struct remote *remote;
1606 char *ref;
1607 struct object_id oid;
1608 int i;
1609
1610 if (!ret)
1611 return; /* no branch */
1612 if (ret->merge)
1613 return; /* already run */
1614 if (!ret->remote_name || !ret->merge_nr) {
1615 /*
1616 * no merge config; let's make sure we don't confuse callers
1617 * with a non-zero merge_nr but a NULL merge
1618 */
1619 ret->merge_nr = 0;
1620 return;
1621 }
1622
1623 remote = remote_get(ret->remote_name);
1624
1625 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1626 for (i = 0; i < ret->merge_nr; i++) {
1627 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1628 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1629 if (!remote_find_tracking(remote, ret->merge[i]) ||
1630 strcmp(ret->remote_name, "."))
1631 continue;
1632 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1633 oid.hash, &ref) == 1)
1634 ret->merge[i]->dst = ref;
1635 else
1636 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1637 }
1638 }
1639
1640 struct branch *branch_get(const char *name)
1641 {
1642 struct branch *ret;
1643
1644 read_config();
1645 if (!name || !*name || !strcmp(name, "HEAD"))
1646 ret = current_branch;
1647 else
1648 ret = make_branch(name, 0);
1649 set_merge(ret);
1650 return ret;
1651 }
1652
1653 int branch_has_merge_config(struct branch *branch)
1654 {
1655 return branch && !!branch->merge;
1656 }
1657
1658 int branch_merge_matches(struct branch *branch,
1659 int i,
1660 const char *refname)
1661 {
1662 if (!branch || i < 0 || i >= branch->merge_nr)
1663 return 0;
1664 return refname_match(branch->merge[i]->src, refname);
1665 }
1666
1667 __attribute__((format (printf,2,3)))
1668 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1669 {
1670 if (err) {
1671 va_list ap;
1672 va_start(ap, fmt);
1673 strbuf_vaddf(err, fmt, ap);
1674 va_end(ap);
1675 }
1676 return NULL;
1677 }
1678
1679 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1680 {
1681 if (!branch)
1682 return error_buf(err, _("HEAD does not point to a branch"));
1683
1684 if (!branch->merge || !branch->merge[0]) {
1685 /*
1686 * no merge config; is it because the user didn't define any,
1687 * or because it is not a real branch, and get_branch
1688 * auto-vivified it?
1689 */
1690 if (!ref_exists(branch->refname))
1691 return error_buf(err, _("no such branch: '%s'"),
1692 branch->name);
1693 return error_buf(err,
1694 _("no upstream configured for branch '%s'"),
1695 branch->name);
1696 }
1697
1698 if (!branch->merge[0]->dst)
1699 return error_buf(err,
1700 _("upstream branch '%s' not stored as a remote-tracking branch"),
1701 branch->merge[0]->src);
1702
1703 return branch->merge[0]->dst;
1704 }
1705
1706 static const char *tracking_for_push_dest(struct remote *remote,
1707 const char *refname,
1708 struct strbuf *err)
1709 {
1710 char *ret;
1711
1712 ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1713 if (!ret)
1714 return error_buf(err,
1715 _("push destination '%s' on remote '%s' has no local tracking branch"),
1716 refname, remote->name);
1717 return ret;
1718 }
1719
1720 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1721 {
1722 struct remote *remote;
1723
1724 if (!branch)
1725 return error_buf(err, _("HEAD does not point to a branch"));
1726
1727 remote = remote_get(pushremote_for_branch(branch, NULL));
1728 if (!remote)
1729 return error_buf(err,
1730 _("branch '%s' has no remote for pushing"),
1731 branch->name);
1732
1733 if (remote->push_refspec_nr) {
1734 char *dst;
1735 const char *ret;
1736
1737 dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1738 branch->refname);
1739 if (!dst)
1740 return error_buf(err,
1741 _("push refspecs for '%s' do not include '%s'"),
1742 remote->name, branch->name);
1743
1744 ret = tracking_for_push_dest(remote, dst, err);
1745 free(dst);
1746 return ret;
1747 }
1748
1749 if (remote->mirror)
1750 return tracking_for_push_dest(remote, branch->refname, err);
1751
1752 switch (push_default) {
1753 case PUSH_DEFAULT_NOTHING:
1754 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1755
1756 case PUSH_DEFAULT_MATCHING:
1757 case PUSH_DEFAULT_CURRENT:
1758 return tracking_for_push_dest(remote, branch->refname, err);
1759
1760 case PUSH_DEFAULT_UPSTREAM:
1761 return branch_get_upstream(branch, err);
1762
1763 case PUSH_DEFAULT_UNSPECIFIED:
1764 case PUSH_DEFAULT_SIMPLE:
1765 {
1766 const char *up, *cur;
1767
1768 up = branch_get_upstream(branch, err);
1769 if (!up)
1770 return NULL;
1771 cur = tracking_for_push_dest(remote, branch->refname, err);
1772 if (!cur)
1773 return NULL;
1774 if (strcmp(cur, up))
1775 return error_buf(err,
1776 _("cannot resolve 'simple' push to a single destination"));
1777 return cur;
1778 }
1779 }
1780
1781 die("BUG: unhandled push situation");
1782 }
1783
1784 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1785 {
1786 if (!branch->push_tracking_ref)
1787 branch->push_tracking_ref = branch_get_push_1(branch, err);
1788 return branch->push_tracking_ref;
1789 }
1790
1791 static int ignore_symref_update(const char *refname)
1792 {
1793 struct object_id oid;
1794 int flag;
1795
1796 if (!resolve_ref_unsafe(refname, 0, oid.hash, &flag))
1797 return 0; /* non-existing refs are OK */
1798 return (flag & REF_ISSYMREF);
1799 }
1800
1801 /*
1802 * Create and return a list of (struct ref) consisting of copies of
1803 * each remote_ref that matches refspec. refspec must be a pattern.
1804 * Fill in the copies' peer_ref to describe the local tracking refs to
1805 * which they map. Omit any references that would map to an existing
1806 * local symbolic ref.
1807 */
1808 static struct ref *get_expanded_map(const struct ref *remote_refs,
1809 const struct refspec *refspec)
1810 {
1811 const struct ref *ref;
1812 struct ref *ret = NULL;
1813 struct ref **tail = &ret;
1814
1815 for (ref = remote_refs; ref; ref = ref->next) {
1816 char *expn_name = NULL;
1817
1818 if (strchr(ref->name, '^'))
1819 continue; /* a dereference item */
1820 if (match_name_with_pattern(refspec->src, ref->name,
1821 refspec->dst, &expn_name) &&
1822 !ignore_symref_update(expn_name)) {
1823 struct ref *cpy = copy_ref(ref);
1824
1825 cpy->peer_ref = alloc_ref(expn_name);
1826 if (refspec->force)
1827 cpy->peer_ref->force = 1;
1828 *tail = cpy;
1829 tail = &cpy->next;
1830 }
1831 free(expn_name);
1832 }
1833
1834 return ret;
1835 }
1836
1837 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1838 {
1839 const struct ref *ref;
1840 for (ref = refs; ref; ref = ref->next) {
1841 if (refname_match(name, ref->name))
1842 return ref;
1843 }
1844 return NULL;
1845 }
1846
1847 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1848 {
1849 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1850
1851 if (!ref)
1852 return NULL;
1853
1854 return copy_ref(ref);
1855 }
1856
1857 static struct ref *get_local_ref(const char *name)
1858 {
1859 if (!name || name[0] == '\0')
1860 return NULL;
1861
1862 if (starts_with(name, "refs/"))
1863 return alloc_ref(name);
1864
1865 if (starts_with(name, "heads/") ||
1866 starts_with(name, "tags/") ||
1867 starts_with(name, "remotes/"))
1868 return alloc_ref_with_prefix("refs/", 5, name);
1869
1870 return alloc_ref_with_prefix("refs/heads/", 11, name);
1871 }
1872
1873 int get_fetch_map(const struct ref *remote_refs,
1874 const struct refspec *refspec,
1875 struct ref ***tail,
1876 int missing_ok)
1877 {
1878 struct ref *ref_map, **rmp;
1879
1880 if (refspec->pattern) {
1881 ref_map = get_expanded_map(remote_refs, refspec);
1882 } else {
1883 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1884
1885 if (refspec->exact_sha1) {
1886 ref_map = alloc_ref(name);
1887 get_oid_hex(name, &ref_map->old_oid);
1888 } else {
1889 ref_map = get_remote_ref(remote_refs, name);
1890 }
1891 if (!missing_ok && !ref_map)
1892 die("Couldn't find remote ref %s", name);
1893 if (ref_map) {
1894 ref_map->peer_ref = get_local_ref(refspec->dst);
1895 if (ref_map->peer_ref && refspec->force)
1896 ref_map->peer_ref->force = 1;
1897 }
1898 }
1899
1900 for (rmp = &ref_map; *rmp; ) {
1901 if ((*rmp)->peer_ref) {
1902 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1903 check_refname_format((*rmp)->peer_ref->name, 0)) {
1904 struct ref *ignore = *rmp;
1905 error("* Ignoring funny ref '%s' locally",
1906 (*rmp)->peer_ref->name);
1907 *rmp = (*rmp)->next;
1908 free(ignore->peer_ref);
1909 free(ignore);
1910 continue;
1911 }
1912 }
1913 rmp = &((*rmp)->next);
1914 }
1915
1916 if (ref_map)
1917 tail_link_ref(ref_map, tail);
1918
1919 return 0;
1920 }
1921
1922 int resolve_remote_symref(struct ref *ref, struct ref *list)
1923 {
1924 if (!ref->symref)
1925 return 0;
1926 for (; list; list = list->next)
1927 if (!strcmp(ref->symref, list->name)) {
1928 oidcpy(&ref->old_oid, &list->old_oid);
1929 return 0;
1930 }
1931 return 1;
1932 }
1933
1934 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1935 {
1936 while (list) {
1937 struct commit *commit = pop_commit(&list);
1938 commit->object.flags &= ~mark;
1939 }
1940 }
1941
1942 int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
1943 {
1944 struct object *o;
1945 struct commit *old, *new;
1946 struct commit_list *list, *used;
1947 int found = 0;
1948
1949 /*
1950 * Both new and old must be commit-ish and new is descendant of
1951 * old. Otherwise we require --force.
1952 */
1953 o = deref_tag(parse_object(old_oid->hash), NULL, 0);
1954 if (!o || o->type != OBJ_COMMIT)
1955 return 0;
1956 old = (struct commit *) o;
1957
1958 o = deref_tag(parse_object(new_oid->hash), NULL, 0);
1959 if (!o || o->type != OBJ_COMMIT)
1960 return 0;
1961 new = (struct commit *) o;
1962
1963 if (parse_commit(new) < 0)
1964 return 0;
1965
1966 used = list = NULL;
1967 commit_list_insert(new, &list);
1968 while (list) {
1969 new = pop_most_recent_commit(&list, TMP_MARK);
1970 commit_list_insert(new, &used);
1971 if (new == old) {
1972 found = 1;
1973 break;
1974 }
1975 }
1976 unmark_and_free(list, TMP_MARK);
1977 unmark_and_free(used, TMP_MARK);
1978 return found;
1979 }
1980
1981 /*
1982 * Compare a branch with its upstream, and save their differences (number
1983 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
1984 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
1985 * is not itself NULL.
1986 *
1987 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1988 * upstream defined, or ref does not exist), 0 otherwise.
1989 */
1990 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1991 const char **upstream_name)
1992 {
1993 struct object_id oid;
1994 struct commit *ours, *theirs;
1995 struct rev_info revs;
1996 const char *base;
1997 struct argv_array argv = ARGV_ARRAY_INIT;
1998
1999 /* Cannot stat unless we are marked to build on top of somebody else. */
2000 base = branch_get_upstream(branch, NULL);
2001 if (upstream_name)
2002 *upstream_name = base;
2003 if (!base)
2004 return -1;
2005
2006 /* Cannot stat if what we used to build on no longer exists */
2007 if (read_ref(base, oid.hash))
2008 return -1;
2009 theirs = lookup_commit_reference(oid.hash);
2010 if (!theirs)
2011 return -1;
2012
2013 if (read_ref(branch->refname, oid.hash))
2014 return -1;
2015 ours = lookup_commit_reference(oid.hash);
2016 if (!ours)
2017 return -1;
2018
2019 /* are we the same? */
2020 if (theirs == ours) {
2021 *num_theirs = *num_ours = 0;
2022 return 0;
2023 }
2024
2025 /* Run "rev-list --left-right ours...theirs" internally... */
2026 argv_array_push(&argv, ""); /* ignored */
2027 argv_array_push(&argv, "--left-right");
2028 argv_array_pushf(&argv, "%s...%s",
2029 oid_to_hex(&ours->object.oid),
2030 oid_to_hex(&theirs->object.oid));
2031 argv_array_push(&argv, "--");
2032
2033 init_revisions(&revs, NULL);
2034 setup_revisions(argv.argc, argv.argv, &revs, NULL);
2035 if (prepare_revision_walk(&revs))
2036 die("revision walk setup failed");
2037
2038 /* ... and count the commits on each side. */
2039 *num_ours = 0;
2040 *num_theirs = 0;
2041 while (1) {
2042 struct commit *c = get_revision(&revs);
2043 if (!c)
2044 break;
2045 if (c->object.flags & SYMMETRIC_LEFT)
2046 (*num_ours)++;
2047 else
2048 (*num_theirs)++;
2049 }
2050
2051 /* clear object flags smudged by the above traversal */
2052 clear_commit_marks(ours, ALL_REV_FLAGS);
2053 clear_commit_marks(theirs, ALL_REV_FLAGS);
2054
2055 argv_array_clear(&argv);
2056 return 0;
2057 }
2058
2059 /*
2060 * Return true when there is anything to report, otherwise false.
2061 */
2062 int format_tracking_info(struct branch *branch, struct strbuf *sb)
2063 {
2064 int ours, theirs;
2065 const char *full_base;
2066 char *base;
2067 int upstream_is_gone = 0;
2068
2069 if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2070 if (!full_base)
2071 return 0;
2072 upstream_is_gone = 1;
2073 }
2074
2075 base = shorten_unambiguous_ref(full_base, 0);
2076 if (upstream_is_gone) {
2077 strbuf_addf(sb,
2078 _("Your branch is based on '%s', but the upstream is gone.\n"),
2079 base);
2080 if (advice_status_hints)
2081 strbuf_addstr(sb,
2082 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2083 } else if (!ours && !theirs) {
2084 strbuf_addf(sb,
2085 _("Your branch is up-to-date with '%s'.\n"),
2086 base);
2087 } else if (!theirs) {
2088 strbuf_addf(sb,
2089 Q_("Your branch is ahead of '%s' by %d commit.\n",
2090 "Your branch is ahead of '%s' by %d commits.\n",
2091 ours),
2092 base, ours);
2093 if (advice_status_hints)
2094 strbuf_addstr(sb,
2095 _(" (use \"git push\" to publish your local commits)\n"));
2096 } else if (!ours) {
2097 strbuf_addf(sb,
2098 Q_("Your branch is behind '%s' by %d commit, "
2099 "and can be fast-forwarded.\n",
2100 "Your branch is behind '%s' by %d commits, "
2101 "and can be fast-forwarded.\n",
2102 theirs),
2103 base, theirs);
2104 if (advice_status_hints)
2105 strbuf_addstr(sb,
2106 _(" (use \"git pull\" to update your local branch)\n"));
2107 } else {
2108 strbuf_addf(sb,
2109 Q_("Your branch and '%s' have diverged,\n"
2110 "and have %d and %d different commit each, "
2111 "respectively.\n",
2112 "Your branch and '%s' have diverged,\n"
2113 "and have %d and %d different commits each, "
2114 "respectively.\n",
2115 ours + theirs),
2116 base, ours, theirs);
2117 if (advice_status_hints)
2118 strbuf_addstr(sb,
2119 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2120 }
2121 free(base);
2122 return 1;
2123 }
2124
2125 static int one_local_ref(const char *refname, const struct object_id *oid,
2126 int flag, void *cb_data)
2127 {
2128 struct ref ***local_tail = cb_data;
2129 struct ref *ref;
2130
2131 /* we already know it starts with refs/ to get here */
2132 if (check_refname_format(refname + 5, 0))
2133 return 0;
2134
2135 ref = alloc_ref(refname);
2136 oidcpy(&ref->new_oid, oid);
2137 **local_tail = ref;
2138 *local_tail = &ref->next;
2139 return 0;
2140 }
2141
2142 struct ref *get_local_heads(void)
2143 {
2144 struct ref *local_refs = NULL, **local_tail = &local_refs;
2145
2146 for_each_ref(one_local_ref, &local_tail);
2147 return local_refs;
2148 }
2149
2150 struct ref *guess_remote_head(const struct ref *head,
2151 const struct ref *refs,
2152 int all)
2153 {
2154 const struct ref *r;
2155 struct ref *list = NULL;
2156 struct ref **tail = &list;
2157
2158 if (!head)
2159 return NULL;
2160
2161 /*
2162 * Some transports support directly peeking at
2163 * where HEAD points; if that is the case, then
2164 * we don't have to guess.
2165 */
2166 if (head->symref)
2167 return copy_ref(find_ref_by_name(refs, head->symref));
2168
2169 /* If refs/heads/master could be right, it is. */
2170 if (!all) {
2171 r = find_ref_by_name(refs, "refs/heads/master");
2172 if (r && !oidcmp(&r->old_oid, &head->old_oid))
2173 return copy_ref(r);
2174 }
2175
2176 /* Look for another ref that points there */
2177 for (r = refs; r; r = r->next) {
2178 if (r != head &&
2179 starts_with(r->name, "refs/heads/") &&
2180 !oidcmp(&r->old_oid, &head->old_oid)) {
2181 *tail = copy_ref(r);
2182 tail = &((*tail)->next);
2183 if (!all)
2184 break;
2185 }
2186 }
2187
2188 return list;
2189 }
2190
2191 struct stale_heads_info {
2192 struct string_list *ref_names;
2193 struct ref **stale_refs_tail;
2194 struct refspec *refs;
2195 int ref_count;
2196 };
2197
2198 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2199 int flags, void *cb_data)
2200 {
2201 struct stale_heads_info *info = cb_data;
2202 struct string_list matches = STRING_LIST_INIT_DUP;
2203 struct refspec query;
2204 int i, stale = 1;
2205 memset(&query, 0, sizeof(struct refspec));
2206 query.dst = (char *)refname;
2207
2208 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2209 if (matches.nr == 0)
2210 goto clean_exit; /* No matches */
2211
2212 /*
2213 * If we did find a suitable refspec and it's not a symref and
2214 * it's not in the list of refs that currently exist in that
2215 * remote, we consider it to be stale. In order to deal with
2216 * overlapping refspecs, we need to go over all of the
2217 * matching refs.
2218 */
2219 if (flags & REF_ISSYMREF)
2220 goto clean_exit;
2221
2222 for (i = 0; stale && i < matches.nr; i++)
2223 if (string_list_has_string(info->ref_names, matches.items[i].string))
2224 stale = 0;
2225
2226 if (stale) {
2227 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2228 oidcpy(&ref->new_oid, oid);
2229 }
2230
2231 clean_exit:
2232 string_list_clear(&matches, 0);
2233 return 0;
2234 }
2235
2236 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2237 {
2238 struct ref *ref, *stale_refs = NULL;
2239 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2240 struct stale_heads_info info;
2241
2242 info.ref_names = &ref_names;
2243 info.stale_refs_tail = &stale_refs;
2244 info.refs = refs;
2245 info.ref_count = ref_count;
2246 for (ref = fetch_map; ref; ref = ref->next)
2247 string_list_append(&ref_names, ref->name);
2248 string_list_sort(&ref_names);
2249 for_each_ref(get_stale_heads_cb, &info);
2250 string_list_clear(&ref_names, 0);
2251 return stale_refs;
2252 }
2253
2254 /*
2255 * Compare-and-swap
2256 */
2257 static void clear_cas_option(struct push_cas_option *cas)
2258 {
2259 int i;
2260
2261 for (i = 0; i < cas->nr; i++)
2262 free(cas->entry[i].refname);
2263 free(cas->entry);
2264 memset(cas, 0, sizeof(*cas));
2265 }
2266
2267 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2268 const char *refname,
2269 size_t refnamelen)
2270 {
2271 struct push_cas *entry;
2272 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2273 entry = &cas->entry[cas->nr++];
2274 memset(entry, 0, sizeof(*entry));
2275 entry->refname = xmemdupz(refname, refnamelen);
2276 return entry;
2277 }
2278
2279 int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2280 {
2281 const char *colon;
2282 struct push_cas *entry;
2283
2284 if (unset) {
2285 /* "--no-<option>" */
2286 clear_cas_option(cas);
2287 return 0;
2288 }
2289
2290 if (!arg) {
2291 /* just "--<option>" */
2292 cas->use_tracking_for_rest = 1;
2293 return 0;
2294 }
2295
2296 /* "--<option>=refname" or "--<option>=refname:value" */
2297 colon = strchrnul(arg, ':');
2298 entry = add_cas_entry(cas, arg, colon - arg);
2299 if (!*colon)
2300 entry->use_tracking = 1;
2301 else if (!colon[1])
2302 hashclr(entry->expect);
2303 else if (get_sha1(colon + 1, entry->expect))
2304 return error("cannot parse expected object name '%s'", colon + 1);
2305 return 0;
2306 }
2307
2308 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2309 {
2310 return parse_push_cas_option(opt->value, arg, unset);
2311 }
2312
2313 int is_empty_cas(const struct push_cas_option *cas)
2314 {
2315 return !cas->use_tracking_for_rest && !cas->nr;
2316 }
2317
2318 /*
2319 * Look at remote.fetch refspec and see if we have a remote
2320 * tracking branch for the refname there. Fill its current
2321 * value in sha1[].
2322 * If we cannot do so, return negative to signal an error.
2323 */
2324 static int remote_tracking(struct remote *remote, const char *refname,
2325 struct object_id *oid)
2326 {
2327 char *dst;
2328
2329 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2330 if (!dst)
2331 return -1; /* no tracking ref for refname at remote */
2332 if (read_ref(dst, oid->hash))
2333 return -1; /* we know what the tracking ref is but we cannot read it */
2334 return 0;
2335 }
2336
2337 static void apply_cas(struct push_cas_option *cas,
2338 struct remote *remote,
2339 struct ref *ref)
2340 {
2341 int i;
2342
2343 /* Find an explicit --<option>=<name>[:<value>] entry */
2344 for (i = 0; i < cas->nr; i++) {
2345 struct push_cas *entry = &cas->entry[i];
2346 if (!refname_match(entry->refname, ref->name))
2347 continue;
2348 ref->expect_old_sha1 = 1;
2349 if (!entry->use_tracking)
2350 hashcpy(ref->old_oid_expect.hash, cas->entry[i].expect);
2351 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2352 oidclr(&ref->old_oid_expect);
2353 return;
2354 }
2355
2356 /* Are we using "--<option>" to cover all? */
2357 if (!cas->use_tracking_for_rest)
2358 return;
2359
2360 ref->expect_old_sha1 = 1;
2361 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2362 oidclr(&ref->old_oid_expect);
2363 }
2364
2365 void apply_push_cas(struct push_cas_option *cas,
2366 struct remote *remote,
2367 struct ref *remote_refs)
2368 {
2369 struct ref *ref;
2370 for (ref = remote_refs; ref; ref = ref->next)
2371 apply_cas(cas, remote, ref);
2372 }
Eric Wong's git-svn branch