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real_path: clarify return value ownership
[git.git] / remote.c
blob41130900698893f46dd18b817a7e6b6485c735a4
1 #include "cache.h"
2 #include "config.h"
3 #include "remote.h"
4 #include "refs.h"
5 #include "commit.h"
6 #include "diff.h"
7 #include "revision.h"
8 #include "dir.h"
9 #include "tag.h"
10 #include "string-list.h"
11 #include "mergesort.h"
12 #include "argv-array.h"
13
14 enum map_direction { FROM_SRC, FROM_DST };
15
16 static struct refspec s_tag_refspec = {
17 0,
18 1,
19 0,
20 0,
21 "refs/tags/*",
22 "refs/tags/*"
23 };
24
25 const struct refspec *tag_refspec = &s_tag_refspec;
26
27 struct counted_string {
28 size_t len;
29 const char *s;
30 };
31 struct rewrite {
32 const char *base;
33 size_t baselen;
34 struct counted_string *instead_of;
35 int instead_of_nr;
36 int instead_of_alloc;
37 };
38 struct rewrites {
39 struct rewrite **rewrite;
40 int rewrite_alloc;
41 int rewrite_nr;
42 };
43
44 static struct remote **remotes;
45 static int remotes_alloc;
46 static int remotes_nr;
47 static struct hashmap remotes_hash;
48
49 static struct branch **branches;
50 static int branches_alloc;
51 static int branches_nr;
52
53 static struct branch *current_branch;
54 static const char *pushremote_name;
55
56 static struct rewrites rewrites;
57 static struct rewrites rewrites_push;
58
59 static int valid_remote(const struct remote *remote)
60 {
61 return (!!remote->url) || (!!remote->foreign_vcs);
62 }
63
64 static const char *alias_url(const char *url, struct rewrites *r)
65 {
66 int i, j;
67 struct counted_string *longest;
68 int longest_i;
69
70 longest = NULL;
71 longest_i = -1;
72 for (i = 0; i < r->rewrite_nr; i++) {
73 if (!r->rewrite[i])
74 continue;
75 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
76 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
77 (!longest ||
78 longest->len < r->rewrite[i]->instead_of[j].len)) {
79 longest = &(r->rewrite[i]->instead_of[j]);
80 longest_i = i;
81 }
82 }
83 }
84 if (!longest)
85 return url;
86
87 return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
88 }
89
90 static void add_push_refspec(struct remote *remote, const char *ref)
91 {
92 ALLOC_GROW(remote->push_refspec,
93 remote->push_refspec_nr + 1,
94 remote->push_refspec_alloc);
95 remote->push_refspec[remote->push_refspec_nr++] = ref;
96 }
97
98 static void add_fetch_refspec(struct remote *remote, const char *ref)
99 {
100 ALLOC_GROW(remote->fetch_refspec,
101 remote->fetch_refspec_nr + 1,
102 remote->fetch_refspec_alloc);
103 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
104 }
105
106 static void add_url(struct remote *remote, const char *url)
107 {
108 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
109 remote->url[remote->url_nr++] = url;
110 }
111
112 static void add_pushurl(struct remote *remote, const char *pushurl)
113 {
114 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
115 remote->pushurl[remote->pushurl_nr++] = pushurl;
116 }
117
118 static void add_pushurl_alias(struct remote *remote, const char *url)
119 {
120 const char *pushurl = alias_url(url, &rewrites_push);
121 if (pushurl != url)
122 add_pushurl(remote, pushurl);
123 }
124
125 static void add_url_alias(struct remote *remote, const char *url)
126 {
127 add_url(remote, alias_url(url, &rewrites));
128 add_pushurl_alias(remote, url);
129 }
130
131 struct remotes_hash_key {
132 const char *str;
133 int len;
134 };
135
136 static int remotes_hash_cmp(const void *unused_cmp_data,
137 const void *entry,
138 const void *entry_or_key,
139 const void *keydata)
140 {
141 const struct remote *a = entry;
142 const struct remote *b = entry_or_key;
143 const struct remotes_hash_key *key = keydata;
144
145 if (key)
146 return strncmp(a->name, key->str, key->len) || a->name[key->len];
147 else
148 return strcmp(a->name, b->name);
149 }
150
151 static inline void init_remotes_hash(void)
152 {
153 if (!remotes_hash.cmpfn)
154 hashmap_init(&remotes_hash, remotes_hash_cmp, NULL, 0);
155 }
156
157 static struct remote *make_remote(const char *name, int len)
158 {
159 struct remote *ret, *replaced;
160 struct remotes_hash_key lookup;
161 struct hashmap_entry lookup_entry;
162
163 if (!len)
164 len = strlen(name);
165
166 init_remotes_hash();
167 lookup.str = name;
168 lookup.len = len;
169 hashmap_entry_init(&lookup_entry, memhash(name, len));
170
171 if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
172 return ret;
173
174 ret = xcalloc(1, sizeof(struct remote));
175 ret->prune = -1; /* unspecified */
176 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
177 remotes[remotes_nr++] = ret;
178 ret->name = xstrndup(name, len);
179
180 hashmap_entry_init(ret, lookup_entry.hash);
181 replaced = hashmap_put(&remotes_hash, ret);
182 assert(replaced == NULL); /* no previous entry overwritten */
183 return ret;
184 }
185
186 static void add_merge(struct branch *branch, const char *name)
187 {
188 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
189 branch->merge_alloc);
190 branch->merge_name[branch->merge_nr++] = name;
191 }
192
193 static struct branch *make_branch(const char *name, int len)
194 {
195 struct branch *ret;
196 int i;
197
198 for (i = 0; i < branches_nr; i++) {
199 if (len ? (!strncmp(name, branches[i]->name, len) &&
200 !branches[i]->name[len]) :
201 !strcmp(name, branches[i]->name))
202 return branches[i];
203 }
204
205 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
206 ret = xcalloc(1, sizeof(struct branch));
207 branches[branches_nr++] = ret;
208 if (len)
209 ret->name = xstrndup(name, len);
210 else
211 ret->name = xstrdup(name);
212 ret->refname = xstrfmt("refs/heads/%s", ret->name);
213
214 return ret;
215 }
216
217 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
218 {
219 struct rewrite *ret;
220 int i;
221
222 for (i = 0; i < r->rewrite_nr; i++) {
223 if (len
224 ? (len == r->rewrite[i]->baselen &&
225 !strncmp(base, r->rewrite[i]->base, len))
226 : !strcmp(base, r->rewrite[i]->base))
227 return r->rewrite[i];
228 }
229
230 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
231 ret = xcalloc(1, sizeof(struct rewrite));
232 r->rewrite[r->rewrite_nr++] = ret;
233 if (len) {
234 ret->base = xstrndup(base, len);
235 ret->baselen = len;
236 }
237 else {
238 ret->base = xstrdup(base);
239 ret->baselen = strlen(base);
240 }
241 return ret;
242 }
243
244 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
245 {
246 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
247 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
248 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
249 rewrite->instead_of_nr++;
250 }
251
252 static const char *skip_spaces(const char *s)
253 {
254 while (isspace(*s))
255 s++;
256 return s;
257 }
258
259 static void read_remotes_file(struct remote *remote)
260 {
261 struct strbuf buf = STRBUF_INIT;
262 FILE *f = fopen_or_warn(git_path("remotes/%s", remote->name), "r");
263
264 if (!f)
265 return;
266 remote->configured_in_repo = 1;
267 remote->origin = REMOTE_REMOTES;
268 while (strbuf_getline(&buf, f) != EOF) {
269 const char *v;
270
271 strbuf_rtrim(&buf);
272
273 if (skip_prefix(buf.buf, "URL:", &v))
274 add_url_alias(remote, xstrdup(skip_spaces(v)));
275 else if (skip_prefix(buf.buf, "Push:", &v))
276 add_push_refspec(remote, xstrdup(skip_spaces(v)));
277 else if (skip_prefix(buf.buf, "Pull:", &v))
278 add_fetch_refspec(remote, xstrdup(skip_spaces(v)));
279 }
280 strbuf_release(&buf);
281 fclose(f);
282 }
283
284 static void read_branches_file(struct remote *remote)
285 {
286 char *frag;
287 struct strbuf buf = STRBUF_INIT;
288 FILE *f = fopen_or_warn(git_path("branches/%s", remote->name), "r");
289
290 if (!f)
291 return;
292
293 strbuf_getline_lf(&buf, f);
294 fclose(f);
295 strbuf_trim(&buf);
296 if (!buf.len) {
297 strbuf_release(&buf);
298 return;
299 }
300
301 remote->configured_in_repo = 1;
302 remote->origin = REMOTE_BRANCHES;
303
304 /*
305 * The branches file would have URL and optionally
306 * #branch specified. The "master" (or specified) branch is
307 * fetched and stored in the local branch matching the
308 * remote name.
309 */
310 frag = strchr(buf.buf, '#');
311 if (frag)
312 *(frag++) = '\0';
313 else
314 frag = "master";
315
316 add_url_alias(remote, strbuf_detach(&buf, NULL));
317 add_fetch_refspec(remote, xstrfmt("refs/heads/%s:refs/heads/%s",
318 frag, remote->name));
319
320 /*
321 * Cogito compatible push: push current HEAD to remote #branch
322 * (master if missing)
323 */
324 add_push_refspec(remote, xstrfmt("HEAD:refs/heads/%s", frag));
325 remote->fetch_tags = 1; /* always auto-follow */
326 }
327
328 static int handle_config(const char *key, const char *value, void *cb)
329 {
330 const char *name;
331 int namelen;
332 const char *subkey;
333 struct remote *remote;
334 struct branch *branch;
335 if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
336 if (!name)
337 return 0;
338 branch = make_branch(name, namelen);
339 if (!strcmp(subkey, "remote")) {
340 return git_config_string(&branch->remote_name, key, value);
341 } else if (!strcmp(subkey, "pushremote")) {
342 return git_config_string(&branch->pushremote_name, key, value);
343 } else if (!strcmp(subkey, "merge")) {
344 if (!value)
345 return config_error_nonbool(key);
346 add_merge(branch, xstrdup(value));
347 }
348 return 0;
349 }
350 if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
351 struct rewrite *rewrite;
352 if (!name)
353 return 0;
354 if (!strcmp(subkey, "insteadof")) {
355 rewrite = make_rewrite(&rewrites, name, namelen);
356 if (!value)
357 return config_error_nonbool(key);
358 add_instead_of(rewrite, xstrdup(value));
359 } else if (!strcmp(subkey, "pushinsteadof")) {
360 rewrite = make_rewrite(&rewrites_push, name, namelen);
361 if (!value)
362 return config_error_nonbool(key);
363 add_instead_of(rewrite, xstrdup(value));
364 }
365 }
366
367 if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
368 return 0;
369
370 /* Handle remote.* variables */
371 if (!name && !strcmp(subkey, "pushdefault"))
372 return git_config_string(&pushremote_name, key, value);
373
374 if (!name)
375 return 0;
376 /* Handle remote.<name>.* variables */
377 if (*name == '/') {
378 warning("Config remote shorthand cannot begin with '/': %s",
379 name);
380 return 0;
381 }
382 remote = make_remote(name, namelen);
383 remote->origin = REMOTE_CONFIG;
384 if (current_config_scope() == CONFIG_SCOPE_REPO)
385 remote->configured_in_repo = 1;
386 if (!strcmp(subkey, "mirror"))
387 remote->mirror = git_config_bool(key, value);
388 else if (!strcmp(subkey, "skipdefaultupdate"))
389 remote->skip_default_update = git_config_bool(key, value);
390 else if (!strcmp(subkey, "skipfetchall"))
391 remote->skip_default_update = git_config_bool(key, value);
392 else if (!strcmp(subkey, "prune"))
393 remote->prune = git_config_bool(key, value);
394 else if (!strcmp(subkey, "url")) {
395 const char *v;
396 if (git_config_string(&v, key, value))
397 return -1;
398 add_url(remote, v);
399 } else if (!strcmp(subkey, "pushurl")) {
400 const char *v;
401 if (git_config_string(&v, key, value))
402 return -1;
403 add_pushurl(remote, v);
404 } else if (!strcmp(subkey, "push")) {
405 const char *v;
406 if (git_config_string(&v, key, value))
407 return -1;
408 add_push_refspec(remote, v);
409 } else if (!strcmp(subkey, "fetch")) {
410 const char *v;
411 if (git_config_string(&v, key, value))
412 return -1;
413 add_fetch_refspec(remote, v);
414 } else if (!strcmp(subkey, "receivepack")) {
415 const char *v;
416 if (git_config_string(&v, key, value))
417 return -1;
418 if (!remote->receivepack)
419 remote->receivepack = v;
420 else
421 error("more than one receivepack given, using the first");
422 } else if (!strcmp(subkey, "uploadpack")) {
423 const char *v;
424 if (git_config_string(&v, key, value))
425 return -1;
426 if (!remote->uploadpack)
427 remote->uploadpack = v;
428 else
429 error("more than one uploadpack given, using the first");
430 } else if (!strcmp(subkey, "tagopt")) {
431 if (!strcmp(value, "--no-tags"))
432 remote->fetch_tags = -1;
433 else if (!strcmp(value, "--tags"))
434 remote->fetch_tags = 2;
435 } else if (!strcmp(subkey, "proxy")) {
436 return git_config_string((const char **)&remote->http_proxy,
437 key, value);
438 } else if (!strcmp(subkey, "proxyauthmethod")) {
439 return git_config_string((const char **)&remote->http_proxy_authmethod,
440 key, value);
441 } else if (!strcmp(subkey, "vcs")) {
442 return git_config_string(&remote->foreign_vcs, key, value);
443 }
444 return 0;
445 }
446
447 static void alias_all_urls(void)
448 {
449 int i, j;
450 for (i = 0; i < remotes_nr; i++) {
451 int add_pushurl_aliases;
452 if (!remotes[i])
453 continue;
454 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
455 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
456 }
457 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
458 for (j = 0; j < remotes[i]->url_nr; j++) {
459 if (add_pushurl_aliases)
460 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
461 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
462 }
463 }
464 }
465
466 static void read_config(void)
467 {
468 static int loaded;
469 struct object_id oid;
470 int flag;
471
472 if (loaded)
473 return;
474 loaded = 1;
475
476 current_branch = NULL;
477 if (startup_info->have_repository) {
478 const char *head_ref = resolve_ref_unsafe("HEAD", 0, oid.hash, &flag);
479 if (head_ref && (flag & REF_ISSYMREF) &&
480 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
481 current_branch = make_branch(head_ref, 0);
482 }
483 }
484 git_config(handle_config, NULL);
485 alias_all_urls();
486 }
487
488 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
489 {
490 int i;
491 struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
492
493 for (i = 0; i < nr_refspec; i++) {
494 size_t llen;
495 int is_glob;
496 const char *lhs, *rhs;
497 int flags;
498
499 is_glob = 0;
500
501 lhs = refspec[i];
502 if (*lhs == '+') {
503 rs[i].force = 1;
504 lhs++;
505 }
506
507 rhs = strrchr(lhs, ':');
508
509 /*
510 * Before going on, special case ":" (or "+:") as a refspec
511 * for pushing matching refs.
512 */
513 if (!fetch && rhs == lhs && rhs[1] == '\0') {
514 rs[i].matching = 1;
515 continue;
516 }
517
518 if (rhs) {
519 size_t rlen = strlen(++rhs);
520 is_glob = (1 <= rlen && strchr(rhs, '*'));
521 rs[i].dst = xstrndup(rhs, rlen);
522 }
523
524 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
525 if (1 <= llen && memchr(lhs, '*', llen)) {
526 if ((rhs && !is_glob) || (!rhs && fetch))
527 goto invalid;
528 is_glob = 1;
529 } else if (rhs && is_glob) {
530 goto invalid;
531 }
532
533 rs[i].pattern = is_glob;
534 rs[i].src = xstrndup(lhs, llen);
535 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
536
537 if (fetch) {
538 struct object_id unused;
539
540 /* LHS */
541 if (!*rs[i].src)
542 ; /* empty is ok; it means "HEAD" */
543 else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(rs[i].src, &unused))
544 rs[i].exact_sha1 = 1; /* ok */
545 else if (!check_refname_format(rs[i].src, flags))
546 ; /* valid looking ref is ok */
547 else
548 goto invalid;
549 /* RHS */
550 if (!rs[i].dst)
551 ; /* missing is ok; it is the same as empty */
552 else if (!*rs[i].dst)
553 ; /* empty is ok; it means "do not store" */
554 else if (!check_refname_format(rs[i].dst, flags))
555 ; /* valid looking ref is ok */
556 else
557 goto invalid;
558 } else {
559 /*
560 * LHS
561 * - empty is allowed; it means delete.
562 * - when wildcarded, it must be a valid looking ref.
563 * - otherwise, it must be an extended SHA-1, but
564 * there is no existing way to validate this.
565 */
566 if (!*rs[i].src)
567 ; /* empty is ok */
568 else if (is_glob) {
569 if (check_refname_format(rs[i].src, flags))
570 goto invalid;
571 }
572 else
573 ; /* anything goes, for now */
574 /*
575 * RHS
576 * - missing is allowed, but LHS then must be a
577 * valid looking ref.
578 * - empty is not allowed.
579 * - otherwise it must be a valid looking ref.
580 */
581 if (!rs[i].dst) {
582 if (check_refname_format(rs[i].src, flags))
583 goto invalid;
584 } else if (!*rs[i].dst) {
585 goto invalid;
586 } else {
587 if (check_refname_format(rs[i].dst, flags))
588 goto invalid;
589 }
590 }
591 }
592 return rs;
593
594 invalid:
595 if (verify) {
596 /*
597 * nr_refspec must be greater than zero and i must be valid
598 * since it is only possible to reach this point from within
599 * the for loop above.
600 */
601 free_refspec(i+1, rs);
602 return NULL;
603 }
604 die("Invalid refspec '%s'", refspec[i]);
605 }
606
607 int valid_fetch_refspec(const char *fetch_refspec_str)
608 {
609 struct refspec *refspec;
610
611 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
612 free_refspec(1, refspec);
613 return !!refspec;
614 }
615
616 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
617 {
618 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
619 }
620
621 struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
622 {
623 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
624 }
625
626 void free_refspec(int nr_refspec, struct refspec *refspec)
627 {
628 int i;
629
630 if (!refspec)
631 return;
632
633 for (i = 0; i < nr_refspec; i++) {
634 free(refspec[i].src);
635 free(refspec[i].dst);
636 }
637 free(refspec);
638 }
639
640 static int valid_remote_nick(const char *name)
641 {
642 if (!name[0] || is_dot_or_dotdot(name))
643 return 0;
644
645 /* remote nicknames cannot contain slashes */
646 while (*name)
647 if (is_dir_sep(*name++))
648 return 0;
649 return 1;
650 }
651
652 const char *remote_for_branch(struct branch *branch, int *explicit)
653 {
654 if (branch && branch->remote_name) {
655 if (explicit)
656 *explicit = 1;
657 return branch->remote_name;
658 }
659 if (explicit)
660 *explicit = 0;
661 return "origin";
662 }
663
664 const char *pushremote_for_branch(struct branch *branch, int *explicit)
665 {
666 if (branch && branch->pushremote_name) {
667 if (explicit)
668 *explicit = 1;
669 return branch->pushremote_name;
670 }
671 if (pushremote_name) {
672 if (explicit)
673 *explicit = 1;
674 return pushremote_name;
675 }
676 return remote_for_branch(branch, explicit);
677 }
678
679 static struct remote *remote_get_1(const char *name,
680 const char *(*get_default)(struct branch *, int *))
681 {
682 struct remote *ret;
683 int name_given = 0;
684
685 read_config();
686
687 if (name)
688 name_given = 1;
689 else
690 name = get_default(current_branch, &name_given);
691
692 ret = make_remote(name, 0);
693 if (valid_remote_nick(name) && have_git_dir()) {
694 if (!valid_remote(ret))
695 read_remotes_file(ret);
696 if (!valid_remote(ret))
697 read_branches_file(ret);
698 }
699 if (name_given && !valid_remote(ret))
700 add_url_alias(ret, name);
701 if (!valid_remote(ret))
702 return NULL;
703 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
704 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
705 return ret;
706 }
707
708 struct remote *remote_get(const char *name)
709 {
710 return remote_get_1(name, remote_for_branch);
711 }
712
713 struct remote *pushremote_get(const char *name)
714 {
715 return remote_get_1(name, pushremote_for_branch);
716 }
717
718 int remote_is_configured(struct remote *remote, int in_repo)
719 {
720 if (!remote)
721 return 0;
722 if (in_repo)
723 return remote->configured_in_repo;
724 return !!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_oid(name, &oid))
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 free(dst_guess);
1194 } else
1195 error("unable to push to unqualified destination: %s\n"
1196 "The destination refspec neither matches an "
1197 "existing ref on the remote nor\n"
1198 "begins with refs/, and we are unable to "
1199 "guess a prefix based on the source ref.",
1200 dst_value);
1201 break;
1202 default:
1203 matched_dst = NULL;
1204 error("dst refspec %s matches more than one.",
1205 dst_value);
1206 break;
1207 }
1208 if (!matched_dst)
1209 return -1;
1210 if (matched_dst->peer_ref)
1211 return error("dst ref %s receives from more than one src.",
1212 matched_dst->name);
1213 else {
1214 matched_dst->peer_ref = allocated_src ?
1215 matched_src :
1216 copy_ref(matched_src);
1217 matched_dst->force = rs->force;
1218 }
1219 return 0;
1220 }
1221
1222 static int match_explicit_refs(struct ref *src, struct ref *dst,
1223 struct ref ***dst_tail, struct refspec *rs,
1224 int rs_nr)
1225 {
1226 int i, errs;
1227 for (i = errs = 0; i < rs_nr; i++)
1228 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1229 return errs;
1230 }
1231
1232 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1233 int send_mirror, int direction, const struct refspec **ret_pat)
1234 {
1235 const struct refspec *pat;
1236 char *name;
1237 int i;
1238 int matching_refs = -1;
1239 for (i = 0; i < rs_nr; i++) {
1240 if (rs[i].matching &&
1241 (matching_refs == -1 || rs[i].force)) {
1242 matching_refs = i;
1243 continue;
1244 }
1245
1246 if (rs[i].pattern) {
1247 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1248 int match;
1249 if (direction == FROM_SRC)
1250 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1251 else
1252 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1253 if (match) {
1254 matching_refs = i;
1255 break;
1256 }
1257 }
1258 }
1259 if (matching_refs == -1)
1260 return NULL;
1261
1262 pat = rs + matching_refs;
1263 if (pat->matching) {
1264 /*
1265 * "matching refs"; traditionally we pushed everything
1266 * including refs outside refs/heads/ hierarchy, but
1267 * that does not make much sense these days.
1268 */
1269 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1270 return NULL;
1271 name = xstrdup(ref->name);
1272 }
1273 if (ret_pat)
1274 *ret_pat = pat;
1275 return name;
1276 }
1277
1278 static struct ref **tail_ref(struct ref **head)
1279 {
1280 struct ref **tail = head;
1281 while (*tail)
1282 tail = &((*tail)->next);
1283 return tail;
1284 }
1285
1286 struct tips {
1287 struct commit **tip;
1288 int nr, alloc;
1289 };
1290
1291 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1292 {
1293 struct commit *commit;
1294
1295 if (is_null_oid(oid))
1296 return;
1297 commit = lookup_commit_reference_gently(oid, 1);
1298 if (!commit || (commit->object.flags & TMP_MARK))
1299 return;
1300 commit->object.flags |= TMP_MARK;
1301 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1302 tips->tip[tips->nr++] = commit;
1303 }
1304
1305 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1306 {
1307 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1308 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1309 struct string_list_item *item;
1310 struct ref *ref;
1311 struct tips sent_tips;
1312
1313 /*
1314 * Collect everything we know they would have at the end of
1315 * this push, and collect all tags they have.
1316 */
1317 memset(&sent_tips, 0, sizeof(sent_tips));
1318 for (ref = *dst; ref; ref = ref->next) {
1319 if (ref->peer_ref &&
1320 !is_null_oid(&ref->peer_ref->new_oid))
1321 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1322 else
1323 add_to_tips(&sent_tips, &ref->old_oid);
1324 if (starts_with(ref->name, "refs/tags/"))
1325 string_list_append(&dst_tag, ref->name);
1326 }
1327 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1328
1329 string_list_sort(&dst_tag);
1330
1331 /* Collect tags they do not have. */
1332 for (ref = src; ref; ref = ref->next) {
1333 if (!starts_with(ref->name, "refs/tags/"))
1334 continue; /* not a tag */
1335 if (string_list_has_string(&dst_tag, ref->name))
1336 continue; /* they already have it */
1337 if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
1338 continue; /* be conservative */
1339 item = string_list_append(&src_tag, ref->name);
1340 item->util = ref;
1341 }
1342 string_list_clear(&dst_tag, 0);
1343
1344 /*
1345 * At this point, src_tag lists tags that are missing from
1346 * dst, and sent_tips lists the tips we are pushing or those
1347 * that we know they already have. An element in the src_tag
1348 * that is an ancestor of any of the sent_tips needs to be
1349 * sent to the other side.
1350 */
1351 if (sent_tips.nr) {
1352 for_each_string_list_item(item, &src_tag) {
1353 struct ref *ref = item->util;
1354 struct ref *dst_ref;
1355 struct commit *commit;
1356
1357 if (is_null_oid(&ref->new_oid))
1358 continue;
1359 commit = lookup_commit_reference_gently(&ref->new_oid,
1360 1);
1361 if (!commit)
1362 /* not pushing a commit, which is not an error */
1363 continue;
1364
1365 /*
1366 * Is this tag, which they do not have, reachable from
1367 * any of the commits we are sending?
1368 */
1369 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1370 continue;
1371
1372 /* Add it in */
1373 dst_ref = make_linked_ref(ref->name, dst_tail);
1374 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1375 dst_ref->peer_ref = copy_ref(ref);
1376 }
1377 }
1378 string_list_clear(&src_tag, 0);
1379 free(sent_tips.tip);
1380 }
1381
1382 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1383 {
1384 for ( ; list; list = list->next)
1385 if (!strcmp(list->name, name))
1386 return (struct ref *)list;
1387 return NULL;
1388 }
1389
1390 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1391 {
1392 for ( ; ref; ref = ref->next)
1393 string_list_append_nodup(ref_index, ref->name)->util = ref;
1394
1395 string_list_sort(ref_index);
1396 }
1397
1398 /*
1399 * Given only the set of local refs, sanity-check the set of push
1400 * refspecs. We can't catch all errors that match_push_refs would,
1401 * but we can catch some errors early before even talking to the
1402 * remote side.
1403 */
1404 int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1405 {
1406 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1407 int ret = 0;
1408 int i;
1409
1410 for (i = 0; i < nr_refspec; i++) {
1411 struct refspec *rs = refspec + i;
1412
1413 if (rs->pattern || rs->matching)
1414 continue;
1415
1416 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1417 }
1418
1419 free_refspec(nr_refspec, refspec);
1420 return ret;
1421 }
1422
1423 /*
1424 * Given the set of refs the local repository has, the set of refs the
1425 * remote repository has, and the refspec used for push, determine
1426 * what remote refs we will update and with what value by setting
1427 * peer_ref (which object is being pushed) and force (if the push is
1428 * forced) in elements of "dst". The function may add new elements to
1429 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1430 */
1431 int match_push_refs(struct ref *src, struct ref **dst,
1432 int nr_refspec, const char **refspec, int flags)
1433 {
1434 struct refspec *rs;
1435 int send_all = flags & MATCH_REFS_ALL;
1436 int send_mirror = flags & MATCH_REFS_MIRROR;
1437 int send_prune = flags & MATCH_REFS_PRUNE;
1438 int errs;
1439 static const char *default_refspec[] = { ":", NULL };
1440 struct ref *ref, **dst_tail = tail_ref(dst);
1441 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1442
1443 if (!nr_refspec) {
1444 nr_refspec = 1;
1445 refspec = default_refspec;
1446 }
1447 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1448 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1449
1450 /* pick the remainder */
1451 for (ref = src; ref; ref = ref->next) {
1452 struct string_list_item *dst_item;
1453 struct ref *dst_peer;
1454 const struct refspec *pat = NULL;
1455 char *dst_name;
1456
1457 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1458 if (!dst_name)
1459 continue;
1460
1461 if (!dst_ref_index.nr)
1462 prepare_ref_index(&dst_ref_index, *dst);
1463
1464 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1465 dst_peer = dst_item ? dst_item->util : NULL;
1466 if (dst_peer) {
1467 if (dst_peer->peer_ref)
1468 /* We're already sending something to this ref. */
1469 goto free_name;
1470 } else {
1471 if (pat->matching && !(send_all || send_mirror))
1472 /*
1473 * Remote doesn't have it, and we have no
1474 * explicit pattern, and we don't have
1475 * --all or --mirror.
1476 */
1477 goto free_name;
1478
1479 /* Create a new one and link it */
1480 dst_peer = make_linked_ref(dst_name, &dst_tail);
1481 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1482 string_list_insert(&dst_ref_index,
1483 dst_peer->name)->util = dst_peer;
1484 }
1485 dst_peer->peer_ref = copy_ref(ref);
1486 dst_peer->force = pat->force;
1487 free_name:
1488 free(dst_name);
1489 }
1490
1491 string_list_clear(&dst_ref_index, 0);
1492
1493 if (flags & MATCH_REFS_FOLLOW_TAGS)
1494 add_missing_tags(src, dst, &dst_tail);
1495
1496 if (send_prune) {
1497 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1498 /* check for missing refs on the remote */
1499 for (ref = *dst; ref; ref = ref->next) {
1500 char *src_name;
1501
1502 if (ref->peer_ref)
1503 /* We're already sending something to this ref. */
1504 continue;
1505
1506 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1507 if (src_name) {
1508 if (!src_ref_index.nr)
1509 prepare_ref_index(&src_ref_index, src);
1510 if (!string_list_has_string(&src_ref_index,
1511 src_name))
1512 ref->peer_ref = alloc_delete_ref();
1513 free(src_name);
1514 }
1515 }
1516 string_list_clear(&src_ref_index, 0);
1517 }
1518 if (errs)
1519 return -1;
1520 return 0;
1521 }
1522
1523 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1524 int force_update)
1525 {
1526 struct ref *ref;
1527
1528 for (ref = remote_refs; ref; ref = ref->next) {
1529 int force_ref_update = ref->force || force_update;
1530 int reject_reason = 0;
1531
1532 if (ref->peer_ref)
1533 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1534 else if (!send_mirror)
1535 continue;
1536
1537 ref->deletion = is_null_oid(&ref->new_oid);
1538 if (!ref->deletion &&
1539 !oidcmp(&ref->old_oid, &ref->new_oid)) {
1540 ref->status = REF_STATUS_UPTODATE;
1541 continue;
1542 }
1543
1544 /*
1545 * If the remote ref has moved and is now different
1546 * from what we expect, reject any push.
1547 *
1548 * It also is an error if the user told us to check
1549 * with the remote-tracking branch to find the value
1550 * to expect, but we did not have such a tracking
1551 * branch.
1552 */
1553 if (ref->expect_old_sha1) {
1554 if (oidcmp(&ref->old_oid, &ref->old_oid_expect))
1555 reject_reason = REF_STATUS_REJECT_STALE;
1556 else
1557 /* If the ref isn't stale then force the update. */
1558 force_ref_update = 1;
1559 }
1560
1561 /*
1562 * If the update isn't already rejected then check
1563 * the usual "must fast-forward" rules.
1564 *
1565 * Decide whether an individual refspec A:B can be
1566 * pushed. The push will succeed if any of the
1567 * following are true:
1568 *
1569 * (1) the remote reference B does not exist
1570 *
1571 * (2) the remote reference B is being removed (i.e.,
1572 * pushing :B where no source is specified)
1573 *
1574 * (3) the destination is not under refs/tags/, and
1575 * if the old and new value is a commit, the new
1576 * is a descendant of the old.
1577 *
1578 * (4) it is forced using the +A:B notation, or by
1579 * passing the --force argument
1580 */
1581
1582 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1583 if (starts_with(ref->name, "refs/tags/"))
1584 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1585 else if (!has_object_file(&ref->old_oid))
1586 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1587 else if (!lookup_commit_reference_gently(&ref->old_oid, 1) ||
1588 !lookup_commit_reference_gently(&ref->new_oid, 1))
1589 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1590 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1591 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1592 }
1593
1594 /*
1595 * "--force" will defeat any rejection implemented
1596 * by the rules above.
1597 */
1598 if (!force_ref_update)
1599 ref->status = reject_reason;
1600 else if (reject_reason)
1601 ref->forced_update = 1;
1602 }
1603 }
1604
1605 static void set_merge(struct branch *ret)
1606 {
1607 struct remote *remote;
1608 char *ref;
1609 struct object_id oid;
1610 int i;
1611
1612 if (!ret)
1613 return; /* no branch */
1614 if (ret->merge)
1615 return; /* already run */
1616 if (!ret->remote_name || !ret->merge_nr) {
1617 /*
1618 * no merge config; let's make sure we don't confuse callers
1619 * with a non-zero merge_nr but a NULL merge
1620 */
1621 ret->merge_nr = 0;
1622 return;
1623 }
1624
1625 remote = remote_get(ret->remote_name);
1626
1627 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1628 for (i = 0; i < ret->merge_nr; i++) {
1629 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1630 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1631 if (!remote_find_tracking(remote, ret->merge[i]) ||
1632 strcmp(ret->remote_name, "."))
1633 continue;
1634 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1635 oid.hash, &ref) == 1)
1636 ret->merge[i]->dst = ref;
1637 else
1638 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1639 }
1640 }
1641
1642 struct branch *branch_get(const char *name)
1643 {
1644 struct branch *ret;
1645
1646 read_config();
1647 if (!name || !*name || !strcmp(name, "HEAD"))
1648 ret = current_branch;
1649 else
1650 ret = make_branch(name, 0);
1651 set_merge(ret);
1652 return ret;
1653 }
1654
1655 int branch_has_merge_config(struct branch *branch)
1656 {
1657 return branch && !!branch->merge;
1658 }
1659
1660 int branch_merge_matches(struct branch *branch,
1661 int i,
1662 const char *refname)
1663 {
1664 if (!branch || i < 0 || i >= branch->merge_nr)
1665 return 0;
1666 return refname_match(branch->merge[i]->src, refname);
1667 }
1668
1669 __attribute__((format (printf,2,3)))
1670 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1671 {
1672 if (err) {
1673 va_list ap;
1674 va_start(ap, fmt);
1675 strbuf_vaddf(err, fmt, ap);
1676 va_end(ap);
1677 }
1678 return NULL;
1679 }
1680
1681 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1682 {
1683 if (!branch)
1684 return error_buf(err, _("HEAD does not point to a branch"));
1685
1686 if (!branch->merge || !branch->merge[0]) {
1687 /*
1688 * no merge config; is it because the user didn't define any,
1689 * or because it is not a real branch, and get_branch
1690 * auto-vivified it?
1691 */
1692 if (!ref_exists(branch->refname))
1693 return error_buf(err, _("no such branch: '%s'"),
1694 branch->name);
1695 return error_buf(err,
1696 _("no upstream configured for branch '%s'"),
1697 branch->name);
1698 }
1699
1700 if (!branch->merge[0]->dst)
1701 return error_buf(err,
1702 _("upstream branch '%s' not stored as a remote-tracking branch"),
1703 branch->merge[0]->src);
1704
1705 return branch->merge[0]->dst;
1706 }
1707
1708 static const char *tracking_for_push_dest(struct remote *remote,
1709 const char *refname,
1710 struct strbuf *err)
1711 {
1712 char *ret;
1713
1714 ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1715 if (!ret)
1716 return error_buf(err,
1717 _("push destination '%s' on remote '%s' has no local tracking branch"),
1718 refname, remote->name);
1719 return ret;
1720 }
1721
1722 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1723 {
1724 struct remote *remote;
1725
1726 remote = remote_get(pushremote_for_branch(branch, NULL));
1727 if (!remote)
1728 return error_buf(err,
1729 _("branch '%s' has no remote for pushing"),
1730 branch->name);
1731
1732 if (remote->push_refspec_nr) {
1733 char *dst;
1734 const char *ret;
1735
1736 dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1737 branch->refname);
1738 if (!dst)
1739 return error_buf(err,
1740 _("push refspecs for '%s' do not include '%s'"),
1741 remote->name, branch->name);
1742
1743 ret = tracking_for_push_dest(remote, dst, err);
1744 free(dst);
1745 return ret;
1746 }
1747
1748 if (remote->mirror)
1749 return tracking_for_push_dest(remote, branch->refname, err);
1750
1751 switch (push_default) {
1752 case PUSH_DEFAULT_NOTHING:
1753 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1754
1755 case PUSH_DEFAULT_MATCHING:
1756 case PUSH_DEFAULT_CURRENT:
1757 return tracking_for_push_dest(remote, branch->refname, err);
1758
1759 case PUSH_DEFAULT_UPSTREAM:
1760 return branch_get_upstream(branch, err);
1761
1762 case PUSH_DEFAULT_UNSPECIFIED:
1763 case PUSH_DEFAULT_SIMPLE:
1764 {
1765 const char *up, *cur;
1766
1767 up = branch_get_upstream(branch, err);
1768 if (!up)
1769 return NULL;
1770 cur = tracking_for_push_dest(remote, branch->refname, err);
1771 if (!cur)
1772 return NULL;
1773 if (strcmp(cur, up))
1774 return error_buf(err,
1775 _("cannot resolve 'simple' push to a single destination"));
1776 return cur;
1777 }
1778 }
1779
1780 die("BUG: unhandled push situation");
1781 }
1782
1783 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1784 {
1785 if (!branch)
1786 return error_buf(err, _("HEAD does not point to a branch"));
1787
1788 if (!branch->push_tracking_ref)
1789 branch->push_tracking_ref = branch_get_push_1(branch, err);
1790 return branch->push_tracking_ref;
1791 }
1792
1793 static int ignore_symref_update(const char *refname)
1794 {
1795 struct object_id oid;
1796 int flag;
1797
1798 if (!resolve_ref_unsafe(refname, 0, oid.hash, &flag))
1799 return 0; /* non-existing refs are OK */
1800 return (flag & REF_ISSYMREF);
1801 }
1802
1803 /*
1804 * Create and return a list of (struct ref) consisting of copies of
1805 * each remote_ref that matches refspec. refspec must be a pattern.
1806 * Fill in the copies' peer_ref to describe the local tracking refs to
1807 * which they map. Omit any references that would map to an existing
1808 * local symbolic ref.
1809 */
1810 static struct ref *get_expanded_map(const struct ref *remote_refs,
1811 const struct refspec *refspec)
1812 {
1813 const struct ref *ref;
1814 struct ref *ret = NULL;
1815 struct ref **tail = &ret;
1816
1817 for (ref = remote_refs; ref; ref = ref->next) {
1818 char *expn_name = NULL;
1819
1820 if (strchr(ref->name, '^'))
1821 continue; /* a dereference item */
1822 if (match_name_with_pattern(refspec->src, ref->name,
1823 refspec->dst, &expn_name) &&
1824 !ignore_symref_update(expn_name)) {
1825 struct ref *cpy = copy_ref(ref);
1826
1827 cpy->peer_ref = alloc_ref(expn_name);
1828 if (refspec->force)
1829 cpy->peer_ref->force = 1;
1830 *tail = cpy;
1831 tail = &cpy->next;
1832 }
1833 free(expn_name);
1834 }
1835
1836 return ret;
1837 }
1838
1839 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1840 {
1841 const struct ref *ref;
1842 for (ref = refs; ref; ref = ref->next) {
1843 if (refname_match(name, ref->name))
1844 return ref;
1845 }
1846 return NULL;
1847 }
1848
1849 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1850 {
1851 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1852
1853 if (!ref)
1854 return NULL;
1855
1856 return copy_ref(ref);
1857 }
1858
1859 static struct ref *get_local_ref(const char *name)
1860 {
1861 if (!name || name[0] == '\0')
1862 return NULL;
1863
1864 if (starts_with(name, "refs/"))
1865 return alloc_ref(name);
1866
1867 if (starts_with(name, "heads/") ||
1868 starts_with(name, "tags/") ||
1869 starts_with(name, "remotes/"))
1870 return alloc_ref_with_prefix("refs/", 5, name);
1871
1872 return alloc_ref_with_prefix("refs/heads/", 11, name);
1873 }
1874
1875 int get_fetch_map(const struct ref *remote_refs,
1876 const struct refspec *refspec,
1877 struct ref ***tail,
1878 int missing_ok)
1879 {
1880 struct ref *ref_map, **rmp;
1881
1882 if (refspec->pattern) {
1883 ref_map = get_expanded_map(remote_refs, refspec);
1884 } else {
1885 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1886
1887 if (refspec->exact_sha1) {
1888 ref_map = alloc_ref(name);
1889 get_oid_hex(name, &ref_map->old_oid);
1890 } else {
1891 ref_map = get_remote_ref(remote_refs, name);
1892 }
1893 if (!missing_ok && !ref_map)
1894 die("Couldn't find remote ref %s", name);
1895 if (ref_map) {
1896 ref_map->peer_ref = get_local_ref(refspec->dst);
1897 if (ref_map->peer_ref && refspec->force)
1898 ref_map->peer_ref->force = 1;
1899 }
1900 }
1901
1902 for (rmp = &ref_map; *rmp; ) {
1903 if ((*rmp)->peer_ref) {
1904 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1905 check_refname_format((*rmp)->peer_ref->name, 0)) {
1906 struct ref *ignore = *rmp;
1907 error("* Ignoring funny ref '%s' locally",
1908 (*rmp)->peer_ref->name);
1909 *rmp = (*rmp)->next;
1910 free(ignore->peer_ref);
1911 free(ignore);
1912 continue;
1913 }
1914 }
1915 rmp = &((*rmp)->next);
1916 }
1917
1918 if (ref_map)
1919 tail_link_ref(ref_map, tail);
1920
1921 return 0;
1922 }
1923
1924 int resolve_remote_symref(struct ref *ref, struct ref *list)
1925 {
1926 if (!ref->symref)
1927 return 0;
1928 for (; list; list = list->next)
1929 if (!strcmp(ref->symref, list->name)) {
1930 oidcpy(&ref->old_oid, &list->old_oid);
1931 return 0;
1932 }
1933 return 1;
1934 }
1935
1936 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1937 {
1938 while (list) {
1939 struct commit *commit = pop_commit(&list);
1940 commit->object.flags &= ~mark;
1941 }
1942 }
1943
1944 int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
1945 {
1946 struct object *o;
1947 struct commit *old, *new;
1948 struct commit_list *list, *used;
1949 int found = 0;
1950
1951 /*
1952 * Both new and old must be commit-ish and new is descendant of
1953 * old. Otherwise we require --force.
1954 */
1955 o = deref_tag(parse_object(old_oid), NULL, 0);
1956 if (!o || o->type != OBJ_COMMIT)
1957 return 0;
1958 old = (struct commit *) o;
1959
1960 o = deref_tag(parse_object(new_oid), NULL, 0);
1961 if (!o || o->type != OBJ_COMMIT)
1962 return 0;
1963 new = (struct commit *) o;
1964
1965 if (parse_commit(new) < 0)
1966 return 0;
1967
1968 used = list = NULL;
1969 commit_list_insert(new, &list);
1970 while (list) {
1971 new = pop_most_recent_commit(&list, TMP_MARK);
1972 commit_list_insert(new, &used);
1973 if (new == old) {
1974 found = 1;
1975 break;
1976 }
1977 }
1978 unmark_and_free(list, TMP_MARK);
1979 unmark_and_free(used, TMP_MARK);
1980 return found;
1981 }
1982
1983 /*
1984 * Compare a branch with its upstream, and save their differences (number
1985 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
1986 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
1987 * is not itself NULL.
1988 *
1989 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1990 * upstream defined, or ref does not exist), 0 otherwise.
1991 */
1992 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1993 const char **upstream_name)
1994 {
1995 struct object_id oid;
1996 struct commit *ours, *theirs;
1997 struct rev_info revs;
1998 const char *base;
1999 struct argv_array argv = ARGV_ARRAY_INIT;
2000
2001 /* Cannot stat unless we are marked to build on top of somebody else. */
2002 base = branch_get_upstream(branch, NULL);
2003 if (upstream_name)
2004 *upstream_name = base;
2005 if (!base)
2006 return -1;
2007
2008 /* Cannot stat if what we used to build on no longer exists */
2009 if (read_ref(base, oid.hash))
2010 return -1;
2011 theirs = lookup_commit_reference(&oid);
2012 if (!theirs)
2013 return -1;
2014
2015 if (read_ref(branch->refname, oid.hash))
2016 return -1;
2017 ours = lookup_commit_reference(&oid);
2018 if (!ours)
2019 return -1;
2020
2021 /* are we the same? */
2022 if (theirs == ours) {
2023 *num_theirs = *num_ours = 0;
2024 return 0;
2025 }
2026
2027 /* Run "rev-list --left-right ours...theirs" internally... */
2028 argv_array_push(&argv, ""); /* ignored */
2029 argv_array_push(&argv, "--left-right");
2030 argv_array_pushf(&argv, "%s...%s",
2031 oid_to_hex(&ours->object.oid),
2032 oid_to_hex(&theirs->object.oid));
2033 argv_array_push(&argv, "--");
2034
2035 init_revisions(&revs, NULL);
2036 setup_revisions(argv.argc, argv.argv, &revs, NULL);
2037 if (prepare_revision_walk(&revs))
2038 die("revision walk setup failed");
2039
2040 /* ... and count the commits on each side. */
2041 *num_ours = 0;
2042 *num_theirs = 0;
2043 while (1) {
2044 struct commit *c = get_revision(&revs);
2045 if (!c)
2046 break;
2047 if (c->object.flags & SYMMETRIC_LEFT)
2048 (*num_ours)++;
2049 else
2050 (*num_theirs)++;
2051 }
2052
2053 /* clear object flags smudged by the above traversal */
2054 clear_commit_marks(ours, ALL_REV_FLAGS);
2055 clear_commit_marks(theirs, ALL_REV_FLAGS);
2056
2057 argv_array_clear(&argv);
2058 return 0;
2059 }
2060
2061 /*
2062 * Return true when there is anything to report, otherwise false.
2063 */
2064 int format_tracking_info(struct branch *branch, struct strbuf *sb)
2065 {
2066 int ours, theirs;
2067 const char *full_base;
2068 char *base;
2069 int upstream_is_gone = 0;
2070
2071 if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2072 if (!full_base)
2073 return 0;
2074 upstream_is_gone = 1;
2075 }
2076
2077 base = shorten_unambiguous_ref(full_base, 0);
2078 if (upstream_is_gone) {
2079 strbuf_addf(sb,
2080 _("Your branch is based on '%s', but the upstream is gone.\n"),
2081 base);
2082 if (advice_status_hints)
2083 strbuf_addstr(sb,
2084 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2085 } else if (!ours && !theirs) {
2086 strbuf_addf(sb,
2087 _("Your branch is up to date with '%s'.\n"),
2088 base);
2089 } else if (!theirs) {
2090 strbuf_addf(sb,
2091 Q_("Your branch is ahead of '%s' by %d commit.\n",
2092 "Your branch is ahead of '%s' by %d commits.\n",
2093 ours),
2094 base, ours);
2095 if (advice_status_hints)
2096 strbuf_addstr(sb,
2097 _(" (use \"git push\" to publish your local commits)\n"));
2098 } else if (!ours) {
2099 strbuf_addf(sb,
2100 Q_("Your branch is behind '%s' by %d commit, "
2101 "and can be fast-forwarded.\n",
2102 "Your branch is behind '%s' by %d commits, "
2103 "and can be fast-forwarded.\n",
2104 theirs),
2105 base, theirs);
2106 if (advice_status_hints)
2107 strbuf_addstr(sb,
2108 _(" (use \"git pull\" to update your local branch)\n"));
2109 } else {
2110 strbuf_addf(sb,
2111 Q_("Your branch and '%s' have diverged,\n"
2112 "and have %d and %d different commit each, "
2113 "respectively.\n",
2114 "Your branch and '%s' have diverged,\n"
2115 "and have %d and %d different commits each, "
2116 "respectively.\n",
2117 ours + theirs),
2118 base, ours, theirs);
2119 if (advice_status_hints)
2120 strbuf_addstr(sb,
2121 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2122 }
2123 free(base);
2124 return 1;
2125 }
2126
2127 static int one_local_ref(const char *refname, const struct object_id *oid,
2128 int flag, void *cb_data)
2129 {
2130 struct ref ***local_tail = cb_data;
2131 struct ref *ref;
2132
2133 /* we already know it starts with refs/ to get here */
2134 if (check_refname_format(refname + 5, 0))
2135 return 0;
2136
2137 ref = alloc_ref(refname);
2138 oidcpy(&ref->new_oid, oid);
2139 **local_tail = ref;
2140 *local_tail = &ref->next;
2141 return 0;
2142 }
2143
2144 struct ref *get_local_heads(void)
2145 {
2146 struct ref *local_refs = NULL, **local_tail = &local_refs;
2147
2148 for_each_ref(one_local_ref, &local_tail);
2149 return local_refs;
2150 }
2151
2152 struct ref *guess_remote_head(const struct ref *head,
2153 const struct ref *refs,
2154 int all)
2155 {
2156 const struct ref *r;
2157 struct ref *list = NULL;
2158 struct ref **tail = &list;
2159
2160 if (!head)
2161 return NULL;
2162
2163 /*
2164 * Some transports support directly peeking at
2165 * where HEAD points; if that is the case, then
2166 * we don't have to guess.
2167 */
2168 if (head->symref)
2169 return copy_ref(find_ref_by_name(refs, head->symref));
2170
2171 /* If refs/heads/master could be right, it is. */
2172 if (!all) {
2173 r = find_ref_by_name(refs, "refs/heads/master");
2174 if (r && !oidcmp(&r->old_oid, &head->old_oid))
2175 return copy_ref(r);
2176 }
2177
2178 /* Look for another ref that points there */
2179 for (r = refs; r; r = r->next) {
2180 if (r != head &&
2181 starts_with(r->name, "refs/heads/") &&
2182 !oidcmp(&r->old_oid, &head->old_oid)) {
2183 *tail = copy_ref(r);
2184 tail = &((*tail)->next);
2185 if (!all)
2186 break;
2187 }
2188 }
2189
2190 return list;
2191 }
2192
2193 struct stale_heads_info {
2194 struct string_list *ref_names;
2195 struct ref **stale_refs_tail;
2196 struct refspec *refs;
2197 int ref_count;
2198 };
2199
2200 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2201 int flags, void *cb_data)
2202 {
2203 struct stale_heads_info *info = cb_data;
2204 struct string_list matches = STRING_LIST_INIT_DUP;
2205 struct refspec query;
2206 int i, stale = 1;
2207 memset(&query, 0, sizeof(struct refspec));
2208 query.dst = (char *)refname;
2209
2210 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2211 if (matches.nr == 0)
2212 goto clean_exit; /* No matches */
2213
2214 /*
2215 * If we did find a suitable refspec and it's not a symref and
2216 * it's not in the list of refs that currently exist in that
2217 * remote, we consider it to be stale. In order to deal with
2218 * overlapping refspecs, we need to go over all of the
2219 * matching refs.
2220 */
2221 if (flags & REF_ISSYMREF)
2222 goto clean_exit;
2223
2224 for (i = 0; stale && i < matches.nr; i++)
2225 if (string_list_has_string(info->ref_names, matches.items[i].string))
2226 stale = 0;
2227
2228 if (stale) {
2229 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2230 oidcpy(&ref->new_oid, oid);
2231 }
2232
2233 clean_exit:
2234 string_list_clear(&matches, 0);
2235 return 0;
2236 }
2237
2238 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2239 {
2240 struct ref *ref, *stale_refs = NULL;
2241 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2242 struct stale_heads_info info;
2243
2244 info.ref_names = &ref_names;
2245 info.stale_refs_tail = &stale_refs;
2246 info.refs = refs;
2247 info.ref_count = ref_count;
2248 for (ref = fetch_map; ref; ref = ref->next)
2249 string_list_append(&ref_names, ref->name);
2250 string_list_sort(&ref_names);
2251 for_each_ref(get_stale_heads_cb, &info);
2252 string_list_clear(&ref_names, 0);
2253 return stale_refs;
2254 }
2255
2256 /*
2257 * Compare-and-swap
2258 */
2259 static void clear_cas_option(struct push_cas_option *cas)
2260 {
2261 int i;
2262
2263 for (i = 0; i < cas->nr; i++)
2264 free(cas->entry[i].refname);
2265 free(cas->entry);
2266 memset(cas, 0, sizeof(*cas));
2267 }
2268
2269 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2270 const char *refname,
2271 size_t refnamelen)
2272 {
2273 struct push_cas *entry;
2274 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2275 entry = &cas->entry[cas->nr++];
2276 memset(entry, 0, sizeof(*entry));
2277 entry->refname = xmemdupz(refname, refnamelen);
2278 return entry;
2279 }
2280
2281 static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2282 {
2283 const char *colon;
2284 struct push_cas *entry;
2285
2286 if (unset) {
2287 /* "--no-<option>" */
2288 clear_cas_option(cas);
2289 return 0;
2290 }
2291
2292 if (!arg) {
2293 /* just "--<option>" */
2294 cas->use_tracking_for_rest = 1;
2295 return 0;
2296 }
2297
2298 /* "--<option>=refname" or "--<option>=refname:value" */
2299 colon = strchrnul(arg, ':');
2300 entry = add_cas_entry(cas, arg, colon - arg);
2301 if (!*colon)
2302 entry->use_tracking = 1;
2303 else if (!colon[1])
2304 oidclr(&entry->expect);
2305 else if (get_oid(colon + 1, &entry->expect))
2306 return error("cannot parse expected object name '%s'", colon + 1);
2307 return 0;
2308 }
2309
2310 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2311 {
2312 return parse_push_cas_option(opt->value, arg, unset);
2313 }
2314
2315 int is_empty_cas(const struct push_cas_option *cas)
2316 {
2317 return !cas->use_tracking_for_rest && !cas->nr;
2318 }
2319
2320 /*
2321 * Look at remote.fetch refspec and see if we have a remote
2322 * tracking branch for the refname there. Fill its current
2323 * value in sha1[].
2324 * If we cannot do so, return negative to signal an error.
2325 */
2326 static int remote_tracking(struct remote *remote, const char *refname,
2327 struct object_id *oid)
2328 {
2329 char *dst;
2330
2331 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2332 if (!dst)
2333 return -1; /* no tracking ref for refname at remote */
2334 if (read_ref(dst, oid->hash))
2335 return -1; /* we know what the tracking ref is but we cannot read it */
2336 return 0;
2337 }
2338
2339 static void apply_cas(struct push_cas_option *cas,
2340 struct remote *remote,
2341 struct ref *ref)
2342 {
2343 int i;
2344
2345 /* Find an explicit --<option>=<name>[:<value>] entry */
2346 for (i = 0; i < cas->nr; i++) {
2347 struct push_cas *entry = &cas->entry[i];
2348 if (!refname_match(entry->refname, ref->name))
2349 continue;
2350 ref->expect_old_sha1 = 1;
2351 if (!entry->use_tracking)
2352 oidcpy(&ref->old_oid_expect, &entry->expect);
2353 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2354 oidclr(&ref->old_oid_expect);
2355 return;
2356 }
2357
2358 /* Are we using "--<option>" to cover all? */
2359 if (!cas->use_tracking_for_rest)
2360 return;
2361
2362 ref->expect_old_sha1 = 1;
2363 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2364 oidclr(&ref->old_oid_expect);
2365 }
2366
2367 void apply_push_cas(struct push_cas_option *cas,
2368 struct remote *remote,
2369 struct ref *remote_refs)
2370 {
2371 struct ref *ref;
2372 for (ref = remote_refs; ref; ref = ref->next)
2373 apply_cas(cas, remote, ref);
2374 }
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