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gc: do not repack promisor packfiles
[alt-git.git] / remote.c
blobb220f0dfc619a6d3150cb2bcee00114f76bd0223
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 int flag;
470
471 if (loaded)
472 return;
473 loaded = 1;
474
475 current_branch = NULL;
476 if (startup_info->have_repository) {
477 const char *head_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flag);
478 if (head_ref && (flag & REF_ISSYMREF) &&
479 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
480 current_branch = make_branch(head_ref, 0);
481 }
482 }
483 git_config(handle_config, NULL);
484 alias_all_urls();
485 }
486
487 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
488 {
489 int i;
490 struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
491
492 for (i = 0; i < nr_refspec; i++) {
493 size_t llen;
494 int is_glob;
495 const char *lhs, *rhs;
496 int flags;
497
498 is_glob = 0;
499
500 lhs = refspec[i];
501 if (*lhs == '+') {
502 rs[i].force = 1;
503 lhs++;
504 }
505
506 rhs = strrchr(lhs, ':');
507
508 /*
509 * Before going on, special case ":" (or "+:") as a refspec
510 * for pushing matching refs.
511 */
512 if (!fetch && rhs == lhs && rhs[1] == '\0') {
513 rs[i].matching = 1;
514 continue;
515 }
516
517 if (rhs) {
518 size_t rlen = strlen(++rhs);
519 is_glob = (1 <= rlen && strchr(rhs, '*'));
520 rs[i].dst = xstrndup(rhs, rlen);
521 }
522
523 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
524 if (1 <= llen && memchr(lhs, '*', llen)) {
525 if ((rhs && !is_glob) || (!rhs && fetch))
526 goto invalid;
527 is_glob = 1;
528 } else if (rhs && is_glob) {
529 goto invalid;
530 }
531
532 rs[i].pattern = is_glob;
533 rs[i].src = xstrndup(lhs, llen);
534 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
535
536 if (fetch) {
537 struct object_id unused;
538
539 /* LHS */
540 if (!*rs[i].src)
541 ; /* empty is ok; it means "HEAD" */
542 else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(rs[i].src, &unused))
543 rs[i].exact_sha1 = 1; /* ok */
544 else if (!check_refname_format(rs[i].src, flags))
545 ; /* valid looking ref is ok */
546 else
547 goto invalid;
548 /* RHS */
549 if (!rs[i].dst)
550 ; /* missing is ok; it is the same as empty */
551 else if (!*rs[i].dst)
552 ; /* empty is ok; it means "do not store" */
553 else if (!check_refname_format(rs[i].dst, flags))
554 ; /* valid looking ref is ok */
555 else
556 goto invalid;
557 } else {
558 /*
559 * LHS
560 * - empty is allowed; it means delete.
561 * - when wildcarded, it must be a valid looking ref.
562 * - otherwise, it must be an extended SHA-1, but
563 * there is no existing way to validate this.
564 */
565 if (!*rs[i].src)
566 ; /* empty is ok */
567 else if (is_glob) {
568 if (check_refname_format(rs[i].src, flags))
569 goto invalid;
570 }
571 else
572 ; /* anything goes, for now */
573 /*
574 * RHS
575 * - missing is allowed, but LHS then must be a
576 * valid looking ref.
577 * - empty is not allowed.
578 * - otherwise it must be a valid looking ref.
579 */
580 if (!rs[i].dst) {
581 if (check_refname_format(rs[i].src, flags))
582 goto invalid;
583 } else if (!*rs[i].dst) {
584 goto invalid;
585 } else {
586 if (check_refname_format(rs[i].dst, flags))
587 goto invalid;
588 }
589 }
590 }
591 return rs;
592
593 invalid:
594 if (verify) {
595 /*
596 * nr_refspec must be greater than zero and i must be valid
597 * since it is only possible to reach this point from within
598 * the for loop above.
599 */
600 free_refspec(i+1, rs);
601 return NULL;
602 }
603 die("Invalid refspec '%s'", refspec[i]);
604 }
605
606 int valid_fetch_refspec(const char *fetch_refspec_str)
607 {
608 struct refspec *refspec;
609
610 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
611 free_refspec(1, refspec);
612 return !!refspec;
613 }
614
615 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
616 {
617 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
618 }
619
620 struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
621 {
622 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
623 }
624
625 void free_refspec(int nr_refspec, struct refspec *refspec)
626 {
627 int i;
628
629 if (!refspec)
630 return;
631
632 for (i = 0; i < nr_refspec; i++) {
633 free(refspec[i].src);
634 free(refspec[i].dst);
635 }
636 free(refspec);
637 }
638
639 static int valid_remote_nick(const char *name)
640 {
641 if (!name[0] || is_dot_or_dotdot(name))
642 return 0;
643
644 /* remote nicknames cannot contain slashes */
645 while (*name)
646 if (is_dir_sep(*name++))
647 return 0;
648 return 1;
649 }
650
651 const char *remote_for_branch(struct branch *branch, int *explicit)
652 {
653 if (branch && branch->remote_name) {
654 if (explicit)
655 *explicit = 1;
656 return branch->remote_name;
657 }
658 if (explicit)
659 *explicit = 0;
660 return "origin";
661 }
662
663 const char *pushremote_for_branch(struct branch *branch, int *explicit)
664 {
665 if (branch && branch->pushremote_name) {
666 if (explicit)
667 *explicit = 1;
668 return branch->pushremote_name;
669 }
670 if (pushremote_name) {
671 if (explicit)
672 *explicit = 1;
673 return pushremote_name;
674 }
675 return remote_for_branch(branch, explicit);
676 }
677
678 static struct remote *remote_get_1(const char *name,
679 const char *(*get_default)(struct branch *, int *))
680 {
681 struct remote *ret;
682 int name_given = 0;
683
684 read_config();
685
686 if (name)
687 name_given = 1;
688 else
689 name = get_default(current_branch, &name_given);
690
691 ret = make_remote(name, 0);
692 if (valid_remote_nick(name) && have_git_dir()) {
693 if (!valid_remote(ret))
694 read_remotes_file(ret);
695 if (!valid_remote(ret))
696 read_branches_file(ret);
697 }
698 if (name_given && !valid_remote(ret))
699 add_url_alias(ret, name);
700 if (!valid_remote(ret))
701 return NULL;
702 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
703 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
704 return ret;
705 }
706
707 struct remote *remote_get(const char *name)
708 {
709 return remote_get_1(name, remote_for_branch);
710 }
711
712 struct remote *pushremote_get(const char *name)
713 {
714 return remote_get_1(name, pushremote_for_branch);
715 }
716
717 int remote_is_configured(struct remote *remote, int in_repo)
718 {
719 if (!remote)
720 return 0;
721 if (in_repo)
722 return remote->configured_in_repo;
723 return !!remote->origin;
724 }
725
726 int for_each_remote(each_remote_fn fn, void *priv)
727 {
728 int i, result = 0;
729 read_config();
730 for (i = 0; i < remotes_nr && !result; i++) {
731 struct remote *r = remotes[i];
732 if (!r)
733 continue;
734 if (!r->fetch)
735 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
736 r->fetch_refspec);
737 if (!r->push)
738 r->push = parse_push_refspec(r->push_refspec_nr,
739 r->push_refspec);
740 result = fn(r, priv);
741 }
742 return result;
743 }
744
745 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
746 {
747 if (strcmp(ref1->name, ref2->name)) {
748 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
749 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
750 die(_("Cannot fetch both %s and %s to %s"),
751 ref1->name, ref2->name, ref2->peer_ref->name);
752 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
753 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
754 warning(_("%s usually tracks %s, not %s"),
755 ref2->peer_ref->name, ref2->name, ref1->name);
756 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
757 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
758 die(_("%s tracks both %s and %s"),
759 ref2->peer_ref->name, ref1->name, ref2->name);
760 } else {
761 /*
762 * This last possibility doesn't occur because
763 * FETCH_HEAD_IGNORE entries always appear at
764 * the end of the list.
765 */
766 die(_("Internal error"));
767 }
768 }
769 free(ref2->peer_ref);
770 free(ref2);
771 }
772
773 struct ref *ref_remove_duplicates(struct ref *ref_map)
774 {
775 struct string_list refs = STRING_LIST_INIT_NODUP;
776 struct ref *retval = NULL;
777 struct ref **p = &retval;
778
779 while (ref_map) {
780 struct ref *ref = ref_map;
781
782 ref_map = ref_map->next;
783 ref->next = NULL;
784
785 if (!ref->peer_ref) {
786 *p = ref;
787 p = &ref->next;
788 } else {
789 struct string_list_item *item =
790 string_list_insert(&refs, ref->peer_ref->name);
791
792 if (item->util) {
793 /* Entry already existed */
794 handle_duplicate((struct ref *)item->util, ref);
795 } else {
796 *p = ref;
797 p = &ref->next;
798 item->util = ref;
799 }
800 }
801 }
802
803 string_list_clear(&refs, 0);
804 return retval;
805 }
806
807 int remote_has_url(struct remote *remote, const char *url)
808 {
809 int i;
810 for (i = 0; i < remote->url_nr; i++) {
811 if (!strcmp(remote->url[i], url))
812 return 1;
813 }
814 return 0;
815 }
816
817 static int match_name_with_pattern(const char *key, const char *name,
818 const char *value, char **result)
819 {
820 const char *kstar = strchr(key, '*');
821 size_t klen;
822 size_t ksuffixlen;
823 size_t namelen;
824 int ret;
825 if (!kstar)
826 die("Key '%s' of pattern had no '*'", key);
827 klen = kstar - key;
828 ksuffixlen = strlen(kstar + 1);
829 namelen = strlen(name);
830 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
831 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
832 if (ret && value) {
833 struct strbuf sb = STRBUF_INIT;
834 const char *vstar = strchr(value, '*');
835 if (!vstar)
836 die("Value '%s' of pattern has no '*'", value);
837 strbuf_add(&sb, value, vstar - value);
838 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
839 strbuf_addstr(&sb, vstar + 1);
840 *result = strbuf_detach(&sb, NULL);
841 }
842 return ret;
843 }
844
845 static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
846 {
847 int i;
848 int find_src = !query->src;
849
850 if (find_src && !query->dst)
851 error("query_refspecs_multiple: need either src or dst");
852
853 for (i = 0; i < ref_count; i++) {
854 struct refspec *refspec = &refs[i];
855 const char *key = find_src ? refspec->dst : refspec->src;
856 const char *value = find_src ? refspec->src : refspec->dst;
857 const char *needle = find_src ? query->dst : query->src;
858 char **result = find_src ? &query->src : &query->dst;
859
860 if (!refspec->dst)
861 continue;
862 if (refspec->pattern) {
863 if (match_name_with_pattern(key, needle, value, result))
864 string_list_append_nodup(results, *result);
865 } else if (!strcmp(needle, key)) {
866 string_list_append(results, value);
867 }
868 }
869 }
870
871 int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
872 {
873 int i;
874 int find_src = !query->src;
875 const char *needle = find_src ? query->dst : query->src;
876 char **result = find_src ? &query->src : &query->dst;
877
878 if (find_src && !query->dst)
879 return error("query_refspecs: need either src or dst");
880
881 for (i = 0; i < ref_count; i++) {
882 struct refspec *refspec = &refs[i];
883 const char *key = find_src ? refspec->dst : refspec->src;
884 const char *value = find_src ? refspec->src : refspec->dst;
885
886 if (!refspec->dst)
887 continue;
888 if (refspec->pattern) {
889 if (match_name_with_pattern(key, needle, value, result)) {
890 query->force = refspec->force;
891 return 0;
892 }
893 } else if (!strcmp(needle, key)) {
894 *result = xstrdup(value);
895 query->force = refspec->force;
896 return 0;
897 }
898 }
899 return -1;
900 }
901
902 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
903 const char *name)
904 {
905 struct refspec query;
906
907 memset(&query, 0, sizeof(struct refspec));
908 query.src = (char *)name;
909
910 if (query_refspecs(refspecs, nr_refspec, &query))
911 return NULL;
912
913 return query.dst;
914 }
915
916 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
917 {
918 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
919 }
920
921 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
922 const char *name)
923 {
924 size_t len = strlen(name);
925 struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
926 memcpy(ref->name, prefix, prefixlen);
927 memcpy(ref->name + prefixlen, name, len);
928 return ref;
929 }
930
931 struct ref *alloc_ref(const char *name)
932 {
933 return alloc_ref_with_prefix("", 0, name);
934 }
935
936 struct ref *copy_ref(const struct ref *ref)
937 {
938 struct ref *cpy;
939 size_t len;
940 if (!ref)
941 return NULL;
942 len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
943 cpy = xmalloc(len);
944 memcpy(cpy, ref, len);
945 cpy->next = NULL;
946 cpy->symref = xstrdup_or_null(ref->symref);
947 cpy->remote_status = xstrdup_or_null(ref->remote_status);
948 cpy->peer_ref = copy_ref(ref->peer_ref);
949 return cpy;
950 }
951
952 struct ref *copy_ref_list(const struct ref *ref)
953 {
954 struct ref *ret = NULL;
955 struct ref **tail = &ret;
956 while (ref) {
957 *tail = copy_ref(ref);
958 ref = ref->next;
959 tail = &((*tail)->next);
960 }
961 return ret;
962 }
963
964 static void free_ref(struct ref *ref)
965 {
966 if (!ref)
967 return;
968 free_ref(ref->peer_ref);
969 free(ref->remote_status);
970 free(ref->symref);
971 free(ref);
972 }
973
974 void free_refs(struct ref *ref)
975 {
976 struct ref *next;
977 while (ref) {
978 next = ref->next;
979 free_ref(ref);
980 ref = next;
981 }
982 }
983
984 int ref_compare_name(const void *va, const void *vb)
985 {
986 const struct ref *a = va, *b = vb;
987 return strcmp(a->name, b->name);
988 }
989
990 static void *ref_list_get_next(const void *a)
991 {
992 return ((const struct ref *)a)->next;
993 }
994
995 static void ref_list_set_next(void *a, void *next)
996 {
997 ((struct ref *)a)->next = next;
998 }
999
1000 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1001 {
1002 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1003 }
1004
1005 int count_refspec_match(const char *pattern,
1006 struct ref *refs,
1007 struct ref **matched_ref)
1008 {
1009 int patlen = strlen(pattern);
1010 struct ref *matched_weak = NULL;
1011 struct ref *matched = NULL;
1012 int weak_match = 0;
1013 int match = 0;
1014
1015 for (weak_match = match = 0; refs; refs = refs->next) {
1016 char *name = refs->name;
1017 int namelen = strlen(name);
1018
1019 if (!refname_match(pattern, name))
1020 continue;
1021
1022 /* A match is "weak" if it is with refs outside
1023 * heads or tags, and did not specify the pattern
1024 * in full (e.g. "refs/remotes/origin/master") or at
1025 * least from the toplevel (e.g. "remotes/origin/master");
1026 * otherwise "git push $URL master" would result in
1027 * ambiguity between remotes/origin/master and heads/master
1028 * at the remote site.
1029 */
1030 if (namelen != patlen &&
1031 patlen != namelen - 5 &&
1032 !starts_with(name, "refs/heads/") &&
1033 !starts_with(name, "refs/tags/")) {
1034 /* We want to catch the case where only weak
1035 * matches are found and there are multiple
1036 * matches, and where more than one strong
1037 * matches are found, as ambiguous. One
1038 * strong match with zero or more weak matches
1039 * are acceptable as a unique match.
1040 */
1041 matched_weak = refs;
1042 weak_match++;
1043 }
1044 else {
1045 matched = refs;
1046 match++;
1047 }
1048 }
1049 if (!matched) {
1050 if (matched_ref)
1051 *matched_ref = matched_weak;
1052 return weak_match;
1053 }
1054 else {
1055 if (matched_ref)
1056 *matched_ref = matched;
1057 return match;
1058 }
1059 }
1060
1061 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1062 {
1063 **tail = ref;
1064 while (ref->next)
1065 ref = ref->next;
1066 *tail = &ref->next;
1067 }
1068
1069 static struct ref *alloc_delete_ref(void)
1070 {
1071 struct ref *ref = alloc_ref("(delete)");
1072 oidclr(&ref->new_oid);
1073 return ref;
1074 }
1075
1076 static int try_explicit_object_name(const char *name,
1077 struct ref **match)
1078 {
1079 struct object_id oid;
1080
1081 if (!*name) {
1082 if (match)
1083 *match = alloc_delete_ref();
1084 return 0;
1085 }
1086
1087 if (get_oid(name, &oid))
1088 return -1;
1089
1090 if (match) {
1091 *match = alloc_ref(name);
1092 oidcpy(&(*match)->new_oid, &oid);
1093 }
1094 return 0;
1095 }
1096
1097 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1098 {
1099 struct ref *ret = alloc_ref(name);
1100 tail_link_ref(ret, tail);
1101 return ret;
1102 }
1103
1104 static char *guess_ref(const char *name, struct ref *peer)
1105 {
1106 struct strbuf buf = STRBUF_INIT;
1107
1108 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1109 NULL, NULL);
1110 if (!r)
1111 return NULL;
1112
1113 if (starts_with(r, "refs/heads/"))
1114 strbuf_addstr(&buf, "refs/heads/");
1115 else if (starts_with(r, "refs/tags/"))
1116 strbuf_addstr(&buf, "refs/tags/");
1117 else
1118 return NULL;
1119
1120 strbuf_addstr(&buf, name);
1121 return strbuf_detach(&buf, NULL);
1122 }
1123
1124 static int match_explicit_lhs(struct ref *src,
1125 struct refspec *rs,
1126 struct ref **match,
1127 int *allocated_match)
1128 {
1129 switch (count_refspec_match(rs->src, src, match)) {
1130 case 1:
1131 if (allocated_match)
1132 *allocated_match = 0;
1133 return 0;
1134 case 0:
1135 /* The source could be in the get_sha1() format
1136 * not a reference name. :refs/other is a
1137 * way to delete 'other' ref at the remote end.
1138 */
1139 if (try_explicit_object_name(rs->src, match) < 0)
1140 return error("src refspec %s does not match any.", rs->src);
1141 if (allocated_match)
1142 *allocated_match = 1;
1143 return 0;
1144 default:
1145 return error("src refspec %s matches more than one.", rs->src);
1146 }
1147 }
1148
1149 static int match_explicit(struct ref *src, struct ref *dst,
1150 struct ref ***dst_tail,
1151 struct refspec *rs)
1152 {
1153 struct ref *matched_src, *matched_dst;
1154 int allocated_src;
1155
1156 const char *dst_value = rs->dst;
1157 char *dst_guess;
1158
1159 if (rs->pattern || rs->matching)
1160 return 0;
1161
1162 matched_src = matched_dst = NULL;
1163 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1164 return -1;
1165
1166 if (!dst_value) {
1167 int flag;
1168
1169 dst_value = resolve_ref_unsafe(matched_src->name,
1170 RESOLVE_REF_READING,
1171 NULL, &flag);
1172 if (!dst_value ||
1173 ((flag & REF_ISSYMREF) &&
1174 !starts_with(dst_value, "refs/heads/")))
1175 die("%s cannot be resolved to branch.",
1176 matched_src->name);
1177 }
1178
1179 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1180 case 1:
1181 break;
1182 case 0:
1183 if (starts_with(dst_value, "refs/"))
1184 matched_dst = make_linked_ref(dst_value, dst_tail);
1185 else if (is_null_oid(&matched_src->new_oid))
1186 error("unable to delete '%s': remote ref does not exist",
1187 dst_value);
1188 else if ((dst_guess = guess_ref(dst_value, matched_src))) {
1189 matched_dst = make_linked_ref(dst_guess, dst_tail);
1190 free(dst_guess);
1191 } else
1192 error("unable to push to unqualified destination: %s\n"
1193 "The destination refspec neither matches an "
1194 "existing ref on the remote nor\n"
1195 "begins with refs/, and we are unable to "
1196 "guess a prefix based on the source ref.",
1197 dst_value);
1198 break;
1199 default:
1200 matched_dst = NULL;
1201 error("dst refspec %s matches more than one.",
1202 dst_value);
1203 break;
1204 }
1205 if (!matched_dst)
1206 return -1;
1207 if (matched_dst->peer_ref)
1208 return error("dst ref %s receives from more than one src.",
1209 matched_dst->name);
1210 else {
1211 matched_dst->peer_ref = allocated_src ?
1212 matched_src :
1213 copy_ref(matched_src);
1214 matched_dst->force = rs->force;
1215 }
1216 return 0;
1217 }
1218
1219 static int match_explicit_refs(struct ref *src, struct ref *dst,
1220 struct ref ***dst_tail, struct refspec *rs,
1221 int rs_nr)
1222 {
1223 int i, errs;
1224 for (i = errs = 0; i < rs_nr; i++)
1225 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1226 return errs;
1227 }
1228
1229 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1230 int send_mirror, int direction, const struct refspec **ret_pat)
1231 {
1232 const struct refspec *pat;
1233 char *name;
1234 int i;
1235 int matching_refs = -1;
1236 for (i = 0; i < rs_nr; i++) {
1237 if (rs[i].matching &&
1238 (matching_refs == -1 || rs[i].force)) {
1239 matching_refs = i;
1240 continue;
1241 }
1242
1243 if (rs[i].pattern) {
1244 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1245 int match;
1246 if (direction == FROM_SRC)
1247 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1248 else
1249 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1250 if (match) {
1251 matching_refs = i;
1252 break;
1253 }
1254 }
1255 }
1256 if (matching_refs == -1)
1257 return NULL;
1258
1259 pat = rs + matching_refs;
1260 if (pat->matching) {
1261 /*
1262 * "matching refs"; traditionally we pushed everything
1263 * including refs outside refs/heads/ hierarchy, but
1264 * that does not make much sense these days.
1265 */
1266 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1267 return NULL;
1268 name = xstrdup(ref->name);
1269 }
1270 if (ret_pat)
1271 *ret_pat = pat;
1272 return name;
1273 }
1274
1275 static struct ref **tail_ref(struct ref **head)
1276 {
1277 struct ref **tail = head;
1278 while (*tail)
1279 tail = &((*tail)->next);
1280 return tail;
1281 }
1282
1283 struct tips {
1284 struct commit **tip;
1285 int nr, alloc;
1286 };
1287
1288 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1289 {
1290 struct commit *commit;
1291
1292 if (is_null_oid(oid))
1293 return;
1294 commit = lookup_commit_reference_gently(oid, 1);
1295 if (!commit || (commit->object.flags & TMP_MARK))
1296 return;
1297 commit->object.flags |= TMP_MARK;
1298 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1299 tips->tip[tips->nr++] = commit;
1300 }
1301
1302 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1303 {
1304 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1305 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1306 struct string_list_item *item;
1307 struct ref *ref;
1308 struct tips sent_tips;
1309
1310 /*
1311 * Collect everything we know they would have at the end of
1312 * this push, and collect all tags they have.
1313 */
1314 memset(&sent_tips, 0, sizeof(sent_tips));
1315 for (ref = *dst; ref; ref = ref->next) {
1316 if (ref->peer_ref &&
1317 !is_null_oid(&ref->peer_ref->new_oid))
1318 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1319 else
1320 add_to_tips(&sent_tips, &ref->old_oid);
1321 if (starts_with(ref->name, "refs/tags/"))
1322 string_list_append(&dst_tag, ref->name);
1323 }
1324 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1325
1326 string_list_sort(&dst_tag);
1327
1328 /* Collect tags they do not have. */
1329 for (ref = src; ref; ref = ref->next) {
1330 if (!starts_with(ref->name, "refs/tags/"))
1331 continue; /* not a tag */
1332 if (string_list_has_string(&dst_tag, ref->name))
1333 continue; /* they already have it */
1334 if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
1335 continue; /* be conservative */
1336 item = string_list_append(&src_tag, ref->name);
1337 item->util = ref;
1338 }
1339 string_list_clear(&dst_tag, 0);
1340
1341 /*
1342 * At this point, src_tag lists tags that are missing from
1343 * dst, and sent_tips lists the tips we are pushing or those
1344 * that we know they already have. An element in the src_tag
1345 * that is an ancestor of any of the sent_tips needs to be
1346 * sent to the other side.
1347 */
1348 if (sent_tips.nr) {
1349 for_each_string_list_item(item, &src_tag) {
1350 struct ref *ref = item->util;
1351 struct ref *dst_ref;
1352 struct commit *commit;
1353
1354 if (is_null_oid(&ref->new_oid))
1355 continue;
1356 commit = lookup_commit_reference_gently(&ref->new_oid,
1357 1);
1358 if (!commit)
1359 /* not pushing a commit, which is not an error */
1360 continue;
1361
1362 /*
1363 * Is this tag, which they do not have, reachable from
1364 * any of the commits we are sending?
1365 */
1366 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1367 continue;
1368
1369 /* Add it in */
1370 dst_ref = make_linked_ref(ref->name, dst_tail);
1371 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1372 dst_ref->peer_ref = copy_ref(ref);
1373 }
1374 }
1375 string_list_clear(&src_tag, 0);
1376 free(sent_tips.tip);
1377 }
1378
1379 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1380 {
1381 for ( ; list; list = list->next)
1382 if (!strcmp(list->name, name))
1383 return (struct ref *)list;
1384 return NULL;
1385 }
1386
1387 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1388 {
1389 for ( ; ref; ref = ref->next)
1390 string_list_append_nodup(ref_index, ref->name)->util = ref;
1391
1392 string_list_sort(ref_index);
1393 }
1394
1395 /*
1396 * Given only the set of local refs, sanity-check the set of push
1397 * refspecs. We can't catch all errors that match_push_refs would,
1398 * but we can catch some errors early before even talking to the
1399 * remote side.
1400 */
1401 int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1402 {
1403 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1404 int ret = 0;
1405 int i;
1406
1407 for (i = 0; i < nr_refspec; i++) {
1408 struct refspec *rs = refspec + i;
1409
1410 if (rs->pattern || rs->matching)
1411 continue;
1412
1413 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1414 }
1415
1416 free_refspec(nr_refspec, refspec);
1417 return ret;
1418 }
1419
1420 /*
1421 * Given the set of refs the local repository has, the set of refs the
1422 * remote repository has, and the refspec used for push, determine
1423 * what remote refs we will update and with what value by setting
1424 * peer_ref (which object is being pushed) and force (if the push is
1425 * forced) in elements of "dst". The function may add new elements to
1426 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1427 */
1428 int match_push_refs(struct ref *src, struct ref **dst,
1429 int nr_refspec, const char **refspec, int flags)
1430 {
1431 struct refspec *rs;
1432 int send_all = flags & MATCH_REFS_ALL;
1433 int send_mirror = flags & MATCH_REFS_MIRROR;
1434 int send_prune = flags & MATCH_REFS_PRUNE;
1435 int errs;
1436 static const char *default_refspec[] = { ":", NULL };
1437 struct ref *ref, **dst_tail = tail_ref(dst);
1438 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1439
1440 if (!nr_refspec) {
1441 nr_refspec = 1;
1442 refspec = default_refspec;
1443 }
1444 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1445 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1446
1447 /* pick the remainder */
1448 for (ref = src; ref; ref = ref->next) {
1449 struct string_list_item *dst_item;
1450 struct ref *dst_peer;
1451 const struct refspec *pat = NULL;
1452 char *dst_name;
1453
1454 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1455 if (!dst_name)
1456 continue;
1457
1458 if (!dst_ref_index.nr)
1459 prepare_ref_index(&dst_ref_index, *dst);
1460
1461 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1462 dst_peer = dst_item ? dst_item->util : NULL;
1463 if (dst_peer) {
1464 if (dst_peer->peer_ref)
1465 /* We're already sending something to this ref. */
1466 goto free_name;
1467 } else {
1468 if (pat->matching && !(send_all || send_mirror))
1469 /*
1470 * Remote doesn't have it, and we have no
1471 * explicit pattern, and we don't have
1472 * --all or --mirror.
1473 */
1474 goto free_name;
1475
1476 /* Create a new one and link it */
1477 dst_peer = make_linked_ref(dst_name, &dst_tail);
1478 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1479 string_list_insert(&dst_ref_index,
1480 dst_peer->name)->util = dst_peer;
1481 }
1482 dst_peer->peer_ref = copy_ref(ref);
1483 dst_peer->force = pat->force;
1484 free_name:
1485 free(dst_name);
1486 }
1487
1488 string_list_clear(&dst_ref_index, 0);
1489
1490 if (flags & MATCH_REFS_FOLLOW_TAGS)
1491 add_missing_tags(src, dst, &dst_tail);
1492
1493 if (send_prune) {
1494 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1495 /* check for missing refs on the remote */
1496 for (ref = *dst; ref; ref = ref->next) {
1497 char *src_name;
1498
1499 if (ref->peer_ref)
1500 /* We're already sending something to this ref. */
1501 continue;
1502
1503 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1504 if (src_name) {
1505 if (!src_ref_index.nr)
1506 prepare_ref_index(&src_ref_index, src);
1507 if (!string_list_has_string(&src_ref_index,
1508 src_name))
1509 ref->peer_ref = alloc_delete_ref();
1510 free(src_name);
1511 }
1512 }
1513 string_list_clear(&src_ref_index, 0);
1514 }
1515 if (errs)
1516 return -1;
1517 return 0;
1518 }
1519
1520 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1521 int force_update)
1522 {
1523 struct ref *ref;
1524
1525 for (ref = remote_refs; ref; ref = ref->next) {
1526 int force_ref_update = ref->force || force_update;
1527 int reject_reason = 0;
1528
1529 if (ref->peer_ref)
1530 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1531 else if (!send_mirror)
1532 continue;
1533
1534 ref->deletion = is_null_oid(&ref->new_oid);
1535 if (!ref->deletion &&
1536 !oidcmp(&ref->old_oid, &ref->new_oid)) {
1537 ref->status = REF_STATUS_UPTODATE;
1538 continue;
1539 }
1540
1541 /*
1542 * If the remote ref has moved and is now different
1543 * from what we expect, reject any push.
1544 *
1545 * It also is an error if the user told us to check
1546 * with the remote-tracking branch to find the value
1547 * to expect, but we did not have such a tracking
1548 * branch.
1549 */
1550 if (ref->expect_old_sha1) {
1551 if (oidcmp(&ref->old_oid, &ref->old_oid_expect))
1552 reject_reason = REF_STATUS_REJECT_STALE;
1553 else
1554 /* If the ref isn't stale then force the update. */
1555 force_ref_update = 1;
1556 }
1557
1558 /*
1559 * If the update isn't already rejected then check
1560 * the usual "must fast-forward" rules.
1561 *
1562 * Decide whether an individual refspec A:B can be
1563 * pushed. The push will succeed if any of the
1564 * following are true:
1565 *
1566 * (1) the remote reference B does not exist
1567 *
1568 * (2) the remote reference B is being removed (i.e.,
1569 * pushing :B where no source is specified)
1570 *
1571 * (3) the destination is not under refs/tags/, and
1572 * if the old and new value is a commit, the new
1573 * is a descendant of the old.
1574 *
1575 * (4) it is forced using the +A:B notation, or by
1576 * passing the --force argument
1577 */
1578
1579 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1580 if (starts_with(ref->name, "refs/tags/"))
1581 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1582 else if (!has_object_file(&ref->old_oid))
1583 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1584 else if (!lookup_commit_reference_gently(&ref->old_oid, 1) ||
1585 !lookup_commit_reference_gently(&ref->new_oid, 1))
1586 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1587 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1588 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1589 }
1590
1591 /*
1592 * "--force" will defeat any rejection implemented
1593 * by the rules above.
1594 */
1595 if (!force_ref_update)
1596 ref->status = reject_reason;
1597 else if (reject_reason)
1598 ref->forced_update = 1;
1599 }
1600 }
1601
1602 static void set_merge(struct branch *ret)
1603 {
1604 struct remote *remote;
1605 char *ref;
1606 struct object_id oid;
1607 int i;
1608
1609 if (!ret)
1610 return; /* no branch */
1611 if (ret->merge)
1612 return; /* already run */
1613 if (!ret->remote_name || !ret->merge_nr) {
1614 /*
1615 * no merge config; let's make sure we don't confuse callers
1616 * with a non-zero merge_nr but a NULL merge
1617 */
1618 ret->merge_nr = 0;
1619 return;
1620 }
1621
1622 remote = remote_get(ret->remote_name);
1623
1624 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1625 for (i = 0; i < ret->merge_nr; i++) {
1626 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1627 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1628 if (!remote_find_tracking(remote, ret->merge[i]) ||
1629 strcmp(ret->remote_name, "."))
1630 continue;
1631 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1632 oid.hash, &ref) == 1)
1633 ret->merge[i]->dst = ref;
1634 else
1635 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1636 }
1637 }
1638
1639 struct branch *branch_get(const char *name)
1640 {
1641 struct branch *ret;
1642
1643 read_config();
1644 if (!name || !*name || !strcmp(name, "HEAD"))
1645 ret = current_branch;
1646 else
1647 ret = make_branch(name, 0);
1648 set_merge(ret);
1649 return ret;
1650 }
1651
1652 int branch_has_merge_config(struct branch *branch)
1653 {
1654 return branch && !!branch->merge;
1655 }
1656
1657 int branch_merge_matches(struct branch *branch,
1658 int i,
1659 const char *refname)
1660 {
1661 if (!branch || i < 0 || i >= branch->merge_nr)
1662 return 0;
1663 return refname_match(branch->merge[i]->src, refname);
1664 }
1665
1666 __attribute__((format (printf,2,3)))
1667 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1668 {
1669 if (err) {
1670 va_list ap;
1671 va_start(ap, fmt);
1672 strbuf_vaddf(err, fmt, ap);
1673 va_end(ap);
1674 }
1675 return NULL;
1676 }
1677
1678 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1679 {
1680 if (!branch)
1681 return error_buf(err, _("HEAD does not point to a branch"));
1682
1683 if (!branch->merge || !branch->merge[0]) {
1684 /*
1685 * no merge config; is it because the user didn't define any,
1686 * or because it is not a real branch, and get_branch
1687 * auto-vivified it?
1688 */
1689 if (!ref_exists(branch->refname))
1690 return error_buf(err, _("no such branch: '%s'"),
1691 branch->name);
1692 return error_buf(err,
1693 _("no upstream configured for branch '%s'"),
1694 branch->name);
1695 }
1696
1697 if (!branch->merge[0]->dst)
1698 return error_buf(err,
1699 _("upstream branch '%s' not stored as a remote-tracking branch"),
1700 branch->merge[0]->src);
1701
1702 return branch->merge[0]->dst;
1703 }
1704
1705 static const char *tracking_for_push_dest(struct remote *remote,
1706 const char *refname,
1707 struct strbuf *err)
1708 {
1709 char *ret;
1710
1711 ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1712 if (!ret)
1713 return error_buf(err,
1714 _("push destination '%s' on remote '%s' has no local tracking branch"),
1715 refname, remote->name);
1716 return ret;
1717 }
1718
1719 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1720 {
1721 struct remote *remote;
1722
1723 remote = remote_get(pushremote_for_branch(branch, NULL));
1724 if (!remote)
1725 return error_buf(err,
1726 _("branch '%s' has no remote for pushing"),
1727 branch->name);
1728
1729 if (remote->push_refspec_nr) {
1730 char *dst;
1731 const char *ret;
1732
1733 dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1734 branch->refname);
1735 if (!dst)
1736 return error_buf(err,
1737 _("push refspecs for '%s' do not include '%s'"),
1738 remote->name, branch->name);
1739
1740 ret = tracking_for_push_dest(remote, dst, err);
1741 free(dst);
1742 return ret;
1743 }
1744
1745 if (remote->mirror)
1746 return tracking_for_push_dest(remote, branch->refname, err);
1747
1748 switch (push_default) {
1749 case PUSH_DEFAULT_NOTHING:
1750 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1751
1752 case PUSH_DEFAULT_MATCHING:
1753 case PUSH_DEFAULT_CURRENT:
1754 return tracking_for_push_dest(remote, branch->refname, err);
1755
1756 case PUSH_DEFAULT_UPSTREAM:
1757 return branch_get_upstream(branch, err);
1758
1759 case PUSH_DEFAULT_UNSPECIFIED:
1760 case PUSH_DEFAULT_SIMPLE:
1761 {
1762 const char *up, *cur;
1763
1764 up = branch_get_upstream(branch, err);
1765 if (!up)
1766 return NULL;
1767 cur = tracking_for_push_dest(remote, branch->refname, err);
1768 if (!cur)
1769 return NULL;
1770 if (strcmp(cur, up))
1771 return error_buf(err,
1772 _("cannot resolve 'simple' push to a single destination"));
1773 return cur;
1774 }
1775 }
1776
1777 die("BUG: unhandled push situation");
1778 }
1779
1780 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1781 {
1782 if (!branch)
1783 return error_buf(err, _("HEAD does not point to a branch"));
1784
1785 if (!branch->push_tracking_ref)
1786 branch->push_tracking_ref = branch_get_push_1(branch, err);
1787 return branch->push_tracking_ref;
1788 }
1789
1790 static int ignore_symref_update(const char *refname)
1791 {
1792 int flag;
1793
1794 if (!resolve_ref_unsafe(refname, 0, NULL, &flag))
1795 return 0; /* non-existing refs are OK */
1796 return (flag & REF_ISSYMREF);
1797 }
1798
1799 /*
1800 * Create and return a list of (struct ref) consisting of copies of
1801 * each remote_ref that matches refspec. refspec must be a pattern.
1802 * Fill in the copies' peer_ref to describe the local tracking refs to
1803 * which they map. Omit any references that would map to an existing
1804 * local symbolic ref.
1805 */
1806 static struct ref *get_expanded_map(const struct ref *remote_refs,
1807 const struct refspec *refspec)
1808 {
1809 const struct ref *ref;
1810 struct ref *ret = NULL;
1811 struct ref **tail = &ret;
1812
1813 for (ref = remote_refs; ref; ref = ref->next) {
1814 char *expn_name = NULL;
1815
1816 if (strchr(ref->name, '^'))
1817 continue; /* a dereference item */
1818 if (match_name_with_pattern(refspec->src, ref->name,
1819 refspec->dst, &expn_name) &&
1820 !ignore_symref_update(expn_name)) {
1821 struct ref *cpy = copy_ref(ref);
1822
1823 cpy->peer_ref = alloc_ref(expn_name);
1824 if (refspec->force)
1825 cpy->peer_ref->force = 1;
1826 *tail = cpy;
1827 tail = &cpy->next;
1828 }
1829 free(expn_name);
1830 }
1831
1832 return ret;
1833 }
1834
1835 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1836 {
1837 const struct ref *ref;
1838 for (ref = refs; ref; ref = ref->next) {
1839 if (refname_match(name, ref->name))
1840 return ref;
1841 }
1842 return NULL;
1843 }
1844
1845 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1846 {
1847 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1848
1849 if (!ref)
1850 return NULL;
1851
1852 return copy_ref(ref);
1853 }
1854
1855 static struct ref *get_local_ref(const char *name)
1856 {
1857 if (!name || name[0] == '\0')
1858 return NULL;
1859
1860 if (starts_with(name, "refs/"))
1861 return alloc_ref(name);
1862
1863 if (starts_with(name, "heads/") ||
1864 starts_with(name, "tags/") ||
1865 starts_with(name, "remotes/"))
1866 return alloc_ref_with_prefix("refs/", 5, name);
1867
1868 return alloc_ref_with_prefix("refs/heads/", 11, name);
1869 }
1870
1871 int get_fetch_map(const struct ref *remote_refs,
1872 const struct refspec *refspec,
1873 struct ref ***tail,
1874 int missing_ok)
1875 {
1876 struct ref *ref_map, **rmp;
1877
1878 if (refspec->pattern) {
1879 ref_map = get_expanded_map(remote_refs, refspec);
1880 } else {
1881 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1882
1883 if (refspec->exact_sha1) {
1884 ref_map = alloc_ref(name);
1885 get_oid_hex(name, &ref_map->old_oid);
1886 } else {
1887 ref_map = get_remote_ref(remote_refs, name);
1888 }
1889 if (!missing_ok && !ref_map)
1890 die("Couldn't find remote ref %s", name);
1891 if (ref_map) {
1892 ref_map->peer_ref = get_local_ref(refspec->dst);
1893 if (ref_map->peer_ref && refspec->force)
1894 ref_map->peer_ref->force = 1;
1895 }
1896 }
1897
1898 for (rmp = &ref_map; *rmp; ) {
1899 if ((*rmp)->peer_ref) {
1900 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1901 check_refname_format((*rmp)->peer_ref->name, 0)) {
1902 struct ref *ignore = *rmp;
1903 error("* Ignoring funny ref '%s' locally",
1904 (*rmp)->peer_ref->name);
1905 *rmp = (*rmp)->next;
1906 free(ignore->peer_ref);
1907 free(ignore);
1908 continue;
1909 }
1910 }
1911 rmp = &((*rmp)->next);
1912 }
1913
1914 if (ref_map)
1915 tail_link_ref(ref_map, tail);
1916
1917 return 0;
1918 }
1919
1920 int resolve_remote_symref(struct ref *ref, struct ref *list)
1921 {
1922 if (!ref->symref)
1923 return 0;
1924 for (; list; list = list->next)
1925 if (!strcmp(ref->symref, list->name)) {
1926 oidcpy(&ref->old_oid, &list->old_oid);
1927 return 0;
1928 }
1929 return 1;
1930 }
1931
1932 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1933 {
1934 while (list) {
1935 struct commit *commit = pop_commit(&list);
1936 commit->object.flags &= ~mark;
1937 }
1938 }
1939
1940 int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
1941 {
1942 struct object *o;
1943 struct commit *old, *new;
1944 struct commit_list *list, *used;
1945 int found = 0;
1946
1947 /*
1948 * Both new and old must be commit-ish and new is descendant of
1949 * old. Otherwise we require --force.
1950 */
1951 o = deref_tag(parse_object(old_oid), NULL, 0);
1952 if (!o || o->type != OBJ_COMMIT)
1953 return 0;
1954 old = (struct commit *) o;
1955
1956 o = deref_tag(parse_object(new_oid), NULL, 0);
1957 if (!o || o->type != OBJ_COMMIT)
1958 return 0;
1959 new = (struct commit *) o;
1960
1961 if (parse_commit(new) < 0)
1962 return 0;
1963
1964 used = list = NULL;
1965 commit_list_insert(new, &list);
1966 while (list) {
1967 new = pop_most_recent_commit(&list, TMP_MARK);
1968 commit_list_insert(new, &used);
1969 if (new == old) {
1970 found = 1;
1971 break;
1972 }
1973 }
1974 unmark_and_free(list, TMP_MARK);
1975 unmark_and_free(used, TMP_MARK);
1976 return found;
1977 }
1978
1979 /*
1980 * Compare a branch with its upstream, and save their differences (number
1981 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
1982 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
1983 * is not itself NULL.
1984 *
1985 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1986 * upstream defined, or ref does not exist), 0 otherwise.
1987 */
1988 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1989 const char **upstream_name)
1990 {
1991 struct object_id oid;
1992 struct commit *ours, *theirs;
1993 struct rev_info revs;
1994 const char *base;
1995 struct argv_array argv = ARGV_ARRAY_INIT;
1996
1997 /* Cannot stat unless we are marked to build on top of somebody else. */
1998 base = branch_get_upstream(branch, NULL);
1999 if (upstream_name)
2000 *upstream_name = base;
2001 if (!base)
2002 return -1;
2003
2004 /* Cannot stat if what we used to build on no longer exists */
2005 if (read_ref(base, oid.hash))
2006 return -1;
2007 theirs = lookup_commit_reference(&oid);
2008 if (!theirs)
2009 return -1;
2010
2011 if (read_ref(branch->refname, oid.hash))
2012 return -1;
2013 ours = lookup_commit_reference(&oid);
2014 if (!ours)
2015 return -1;
2016
2017 /* are we the same? */
2018 if (theirs == ours) {
2019 *num_theirs = *num_ours = 0;
2020 return 0;
2021 }
2022
2023 /* Run "rev-list --left-right ours...theirs" internally... */
2024 argv_array_push(&argv, ""); /* ignored */
2025 argv_array_push(&argv, "--left-right");
2026 argv_array_pushf(&argv, "%s...%s",
2027 oid_to_hex(&ours->object.oid),
2028 oid_to_hex(&theirs->object.oid));
2029 argv_array_push(&argv, "--");
2030
2031 init_revisions(&revs, NULL);
2032 setup_revisions(argv.argc, argv.argv, &revs, NULL);
2033 if (prepare_revision_walk(&revs))
2034 die("revision walk setup failed");
2035
2036 /* ... and count the commits on each side. */
2037 *num_ours = 0;
2038 *num_theirs = 0;
2039 while (1) {
2040 struct commit *c = get_revision(&revs);
2041 if (!c)
2042 break;
2043 if (c->object.flags & SYMMETRIC_LEFT)
2044 (*num_ours)++;
2045 else
2046 (*num_theirs)++;
2047 }
2048
2049 /* clear object flags smudged by the above traversal */
2050 clear_commit_marks(ours, ALL_REV_FLAGS);
2051 clear_commit_marks(theirs, ALL_REV_FLAGS);
2052
2053 argv_array_clear(&argv);
2054 return 0;
2055 }
2056
2057 /*
2058 * Return true when there is anything to report, otherwise false.
2059 */
2060 int format_tracking_info(struct branch *branch, struct strbuf *sb)
2061 {
2062 int ours, theirs;
2063 const char *full_base;
2064 char *base;
2065 int upstream_is_gone = 0;
2066
2067 if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2068 if (!full_base)
2069 return 0;
2070 upstream_is_gone = 1;
2071 }
2072
2073 base = shorten_unambiguous_ref(full_base, 0);
2074 if (upstream_is_gone) {
2075 strbuf_addf(sb,
2076 _("Your branch is based on '%s', but the upstream is gone.\n"),
2077 base);
2078 if (advice_status_hints)
2079 strbuf_addstr(sb,
2080 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2081 } else if (!ours && !theirs) {
2082 strbuf_addf(sb,
2083 _("Your branch is up to date with '%s'.\n"),
2084 base);
2085 } else if (!theirs) {
2086 strbuf_addf(sb,
2087 Q_("Your branch is ahead of '%s' by %d commit.\n",
2088 "Your branch is ahead of '%s' by %d commits.\n",
2089 ours),
2090 base, ours);
2091 if (advice_status_hints)
2092 strbuf_addstr(sb,
2093 _(" (use \"git push\" to publish your local commits)\n"));
2094 } else if (!ours) {
2095 strbuf_addf(sb,
2096 Q_("Your branch is behind '%s' by %d commit, "
2097 "and can be fast-forwarded.\n",
2098 "Your branch is behind '%s' by %d commits, "
2099 "and can be fast-forwarded.\n",
2100 theirs),
2101 base, theirs);
2102 if (advice_status_hints)
2103 strbuf_addstr(sb,
2104 _(" (use \"git pull\" to update your local branch)\n"));
2105 } else {
2106 strbuf_addf(sb,
2107 Q_("Your branch and '%s' have diverged,\n"
2108 "and have %d and %d different commit each, "
2109 "respectively.\n",
2110 "Your branch and '%s' have diverged,\n"
2111 "and have %d and %d different commits each, "
2112 "respectively.\n",
2113 ours + theirs),
2114 base, ours, theirs);
2115 if (advice_status_hints)
2116 strbuf_addstr(sb,
2117 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2118 }
2119 free(base);
2120 return 1;
2121 }
2122
2123 static int one_local_ref(const char *refname, const struct object_id *oid,
2124 int flag, void *cb_data)
2125 {
2126 struct ref ***local_tail = cb_data;
2127 struct ref *ref;
2128
2129 /* we already know it starts with refs/ to get here */
2130 if (check_refname_format(refname + 5, 0))
2131 return 0;
2132
2133 ref = alloc_ref(refname);
2134 oidcpy(&ref->new_oid, oid);
2135 **local_tail = ref;
2136 *local_tail = &ref->next;
2137 return 0;
2138 }
2139
2140 struct ref *get_local_heads(void)
2141 {
2142 struct ref *local_refs = NULL, **local_tail = &local_refs;
2143
2144 for_each_ref(one_local_ref, &local_tail);
2145 return local_refs;
2146 }
2147
2148 struct ref *guess_remote_head(const struct ref *head,
2149 const struct ref *refs,
2150 int all)
2151 {
2152 const struct ref *r;
2153 struct ref *list = NULL;
2154 struct ref **tail = &list;
2155
2156 if (!head)
2157 return NULL;
2158
2159 /*
2160 * Some transports support directly peeking at
2161 * where HEAD points; if that is the case, then
2162 * we don't have to guess.
2163 */
2164 if (head->symref)
2165 return copy_ref(find_ref_by_name(refs, head->symref));
2166
2167 /* If refs/heads/master could be right, it is. */
2168 if (!all) {
2169 r = find_ref_by_name(refs, "refs/heads/master");
2170 if (r && !oidcmp(&r->old_oid, &head->old_oid))
2171 return copy_ref(r);
2172 }
2173
2174 /* Look for another ref that points there */
2175 for (r = refs; r; r = r->next) {
2176 if (r != head &&
2177 starts_with(r->name, "refs/heads/") &&
2178 !oidcmp(&r->old_oid, &head->old_oid)) {
2179 *tail = copy_ref(r);
2180 tail = &((*tail)->next);
2181 if (!all)
2182 break;
2183 }
2184 }
2185
2186 return list;
2187 }
2188
2189 struct stale_heads_info {
2190 struct string_list *ref_names;
2191 struct ref **stale_refs_tail;
2192 struct refspec *refs;
2193 int ref_count;
2194 };
2195
2196 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2197 int flags, void *cb_data)
2198 {
2199 struct stale_heads_info *info = cb_data;
2200 struct string_list matches = STRING_LIST_INIT_DUP;
2201 struct refspec query;
2202 int i, stale = 1;
2203 memset(&query, 0, sizeof(struct refspec));
2204 query.dst = (char *)refname;
2205
2206 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2207 if (matches.nr == 0)
2208 goto clean_exit; /* No matches */
2209
2210 /*
2211 * If we did find a suitable refspec and it's not a symref and
2212 * it's not in the list of refs that currently exist in that
2213 * remote, we consider it to be stale. In order to deal with
2214 * overlapping refspecs, we need to go over all of the
2215 * matching refs.
2216 */
2217 if (flags & REF_ISSYMREF)
2218 goto clean_exit;
2219
2220 for (i = 0; stale && i < matches.nr; i++)
2221 if (string_list_has_string(info->ref_names, matches.items[i].string))
2222 stale = 0;
2223
2224 if (stale) {
2225 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2226 oidcpy(&ref->new_oid, oid);
2227 }
2228
2229 clean_exit:
2230 string_list_clear(&matches, 0);
2231 return 0;
2232 }
2233
2234 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2235 {
2236 struct ref *ref, *stale_refs = NULL;
2237 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2238 struct stale_heads_info info;
2239
2240 info.ref_names = &ref_names;
2241 info.stale_refs_tail = &stale_refs;
2242 info.refs = refs;
2243 info.ref_count = ref_count;
2244 for (ref = fetch_map; ref; ref = ref->next)
2245 string_list_append(&ref_names, ref->name);
2246 string_list_sort(&ref_names);
2247 for_each_ref(get_stale_heads_cb, &info);
2248 string_list_clear(&ref_names, 0);
2249 return stale_refs;
2250 }
2251
2252 /*
2253 * Compare-and-swap
2254 */
2255 static void clear_cas_option(struct push_cas_option *cas)
2256 {
2257 int i;
2258
2259 for (i = 0; i < cas->nr; i++)
2260 free(cas->entry[i].refname);
2261 free(cas->entry);
2262 memset(cas, 0, sizeof(*cas));
2263 }
2264
2265 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2266 const char *refname,
2267 size_t refnamelen)
2268 {
2269 struct push_cas *entry;
2270 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2271 entry = &cas->entry[cas->nr++];
2272 memset(entry, 0, sizeof(*entry));
2273 entry->refname = xmemdupz(refname, refnamelen);
2274 return entry;
2275 }
2276
2277 static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2278 {
2279 const char *colon;
2280 struct push_cas *entry;
2281
2282 if (unset) {
2283 /* "--no-<option>" */
2284 clear_cas_option(cas);
2285 return 0;
2286 }
2287
2288 if (!arg) {
2289 /* just "--<option>" */
2290 cas->use_tracking_for_rest = 1;
2291 return 0;
2292 }
2293
2294 /* "--<option>=refname" or "--<option>=refname:value" */
2295 colon = strchrnul(arg, ':');
2296 entry = add_cas_entry(cas, arg, colon - arg);
2297 if (!*colon)
2298 entry->use_tracking = 1;
2299 else if (!colon[1])
2300 oidclr(&entry->expect);
2301 else if (get_oid(colon + 1, &entry->expect))
2302 return error("cannot parse expected object name '%s'", colon + 1);
2303 return 0;
2304 }
2305
2306 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2307 {
2308 return parse_push_cas_option(opt->value, arg, unset);
2309 }
2310
2311 int is_empty_cas(const struct push_cas_option *cas)
2312 {
2313 return !cas->use_tracking_for_rest && !cas->nr;
2314 }
2315
2316 /*
2317 * Look at remote.fetch refspec and see if we have a remote
2318 * tracking branch for the refname there. Fill its current
2319 * value in sha1[].
2320 * If we cannot do so, return negative to signal an error.
2321 */
2322 static int remote_tracking(struct remote *remote, const char *refname,
2323 struct object_id *oid)
2324 {
2325 char *dst;
2326
2327 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2328 if (!dst)
2329 return -1; /* no tracking ref for refname at remote */
2330 if (read_ref(dst, oid->hash))
2331 return -1; /* we know what the tracking ref is but we cannot read it */
2332 return 0;
2333 }
2334
2335 static void apply_cas(struct push_cas_option *cas,
2336 struct remote *remote,
2337 struct ref *ref)
2338 {
2339 int i;
2340
2341 /* Find an explicit --<option>=<name>[:<value>] entry */
2342 for (i = 0; i < cas->nr; i++) {
2343 struct push_cas *entry = &cas->entry[i];
2344 if (!refname_match(entry->refname, ref->name))
2345 continue;
2346 ref->expect_old_sha1 = 1;
2347 if (!entry->use_tracking)
2348 oidcpy(&ref->old_oid_expect, &entry->expect);
2349 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2350 oidclr(&ref->old_oid_expect);
2351 return;
2352 }
2353
2354 /* Are we using "--<option>" to cover all? */
2355 if (!cas->use_tracking_for_rest)
2356 return;
2357
2358 ref->expect_old_sha1 = 1;
2359 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2360 oidclr(&ref->old_oid_expect);
2361 }
2362
2363 void apply_push_cas(struct push_cas_option *cas,
2364 struct remote *remote,
2365 struct ref *remote_refs)
2366 {
2367 struct ref *ref;
2368 for (ref = remote_refs; ref; ref = ref->next)
2369 apply_cas(cas, remote, ref);
2370 }
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