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fetch tests: refactor in preparation for testing tag pruning
[git.git] / remote.c
blob356c123e3ea42bfac16aa85d28cdad5fbac25397
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 /* See TAG_REFSPEC for the string version */
26 const struct refspec *tag_refspec = &s_tag_refspec;
27
28 struct counted_string {
29 size_t len;
30 const char *s;
31 };
32 struct rewrite {
33 const char *base;
34 size_t baselen;
35 struct counted_string *instead_of;
36 int instead_of_nr;
37 int instead_of_alloc;
38 };
39 struct rewrites {
40 struct rewrite **rewrite;
41 int rewrite_alloc;
42 int rewrite_nr;
43 };
44
45 static struct remote **remotes;
46 static int remotes_alloc;
47 static int remotes_nr;
48 static struct hashmap remotes_hash;
49
50 static struct branch **branches;
51 static int branches_alloc;
52 static int branches_nr;
53
54 static struct branch *current_branch;
55 static const char *pushremote_name;
56
57 static struct rewrites rewrites;
58 static struct rewrites rewrites_push;
59
60 static int valid_remote(const struct remote *remote)
61 {
62 return (!!remote->url) || (!!remote->foreign_vcs);
63 }
64
65 static const char *alias_url(const char *url, struct rewrites *r)
66 {
67 int i, j;
68 struct counted_string *longest;
69 int longest_i;
70
71 longest = NULL;
72 longest_i = -1;
73 for (i = 0; i < r->rewrite_nr; i++) {
74 if (!r->rewrite[i])
75 continue;
76 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
77 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
78 (!longest ||
79 longest->len < r->rewrite[i]->instead_of[j].len)) {
80 longest = &(r->rewrite[i]->instead_of[j]);
81 longest_i = i;
82 }
83 }
84 }
85 if (!longest)
86 return url;
87
88 return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
89 }
90
91 static void add_push_refspec(struct remote *remote, const char *ref)
92 {
93 ALLOC_GROW(remote->push_refspec,
94 remote->push_refspec_nr + 1,
95 remote->push_refspec_alloc);
96 remote->push_refspec[remote->push_refspec_nr++] = ref;
97 }
98
99 static void add_fetch_refspec(struct remote *remote, const char *ref)
100 {
101 ALLOC_GROW(remote->fetch_refspec,
102 remote->fetch_refspec_nr + 1,
103 remote->fetch_refspec_alloc);
104 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
105 }
106
107 static void add_url(struct remote *remote, const char *url)
108 {
109 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
110 remote->url[remote->url_nr++] = url;
111 }
112
113 static void add_pushurl(struct remote *remote, const char *pushurl)
114 {
115 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
116 remote->pushurl[remote->pushurl_nr++] = pushurl;
117 }
118
119 static void add_pushurl_alias(struct remote *remote, const char *url)
120 {
121 const char *pushurl = alias_url(url, &rewrites_push);
122 if (pushurl != url)
123 add_pushurl(remote, pushurl);
124 }
125
126 static void add_url_alias(struct remote *remote, const char *url)
127 {
128 add_url(remote, alias_url(url, &rewrites));
129 add_pushurl_alias(remote, url);
130 }
131
132 struct remotes_hash_key {
133 const char *str;
134 int len;
135 };
136
137 static int remotes_hash_cmp(const void *unused_cmp_data,
138 const void *entry,
139 const void *entry_or_key,
140 const void *keydata)
141 {
142 const struct remote *a = entry;
143 const struct remote *b = entry_or_key;
144 const struct remotes_hash_key *key = keydata;
145
146 if (key)
147 return strncmp(a->name, key->str, key->len) || a->name[key->len];
148 else
149 return strcmp(a->name, b->name);
150 }
151
152 static inline void init_remotes_hash(void)
153 {
154 if (!remotes_hash.cmpfn)
155 hashmap_init(&remotes_hash, remotes_hash_cmp, NULL, 0);
156 }
157
158 static struct remote *make_remote(const char *name, int len)
159 {
160 struct remote *ret, *replaced;
161 struct remotes_hash_key lookup;
162 struct hashmap_entry lookup_entry;
163
164 if (!len)
165 len = strlen(name);
166
167 init_remotes_hash();
168 lookup.str = name;
169 lookup.len = len;
170 hashmap_entry_init(&lookup_entry, memhash(name, len));
171
172 if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
173 return ret;
174
175 ret = xcalloc(1, sizeof(struct remote));
176 ret->prune = -1; /* unspecified */
177 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
178 remotes[remotes_nr++] = ret;
179 ret->name = xstrndup(name, len);
180
181 hashmap_entry_init(ret, lookup_entry.hash);
182 replaced = hashmap_put(&remotes_hash, ret);
183 assert(replaced == NULL); /* no previous entry overwritten */
184 return ret;
185 }
186
187 static void add_merge(struct branch *branch, const char *name)
188 {
189 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
190 branch->merge_alloc);
191 branch->merge_name[branch->merge_nr++] = name;
192 }
193
194 static struct branch *make_branch(const char *name, int len)
195 {
196 struct branch *ret;
197 int i;
198
199 for (i = 0; i < branches_nr; i++) {
200 if (len ? (!strncmp(name, branches[i]->name, len) &&
201 !branches[i]->name[len]) :
202 !strcmp(name, branches[i]->name))
203 return branches[i];
204 }
205
206 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
207 ret = xcalloc(1, sizeof(struct branch));
208 branches[branches_nr++] = ret;
209 if (len)
210 ret->name = xstrndup(name, len);
211 else
212 ret->name = xstrdup(name);
213 ret->refname = xstrfmt("refs/heads/%s", ret->name);
214
215 return ret;
216 }
217
218 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
219 {
220 struct rewrite *ret;
221 int i;
222
223 for (i = 0; i < r->rewrite_nr; i++) {
224 if (len
225 ? (len == r->rewrite[i]->baselen &&
226 !strncmp(base, r->rewrite[i]->base, len))
227 : !strcmp(base, r->rewrite[i]->base))
228 return r->rewrite[i];
229 }
230
231 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
232 ret = xcalloc(1, sizeof(struct rewrite));
233 r->rewrite[r->rewrite_nr++] = ret;
234 if (len) {
235 ret->base = xstrndup(base, len);
236 ret->baselen = len;
237 }
238 else {
239 ret->base = xstrdup(base);
240 ret->baselen = strlen(base);
241 }
242 return ret;
243 }
244
245 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
246 {
247 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
248 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
249 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
250 rewrite->instead_of_nr++;
251 }
252
253 static const char *skip_spaces(const char *s)
254 {
255 while (isspace(*s))
256 s++;
257 return s;
258 }
259
260 static void read_remotes_file(struct remote *remote)
261 {
262 struct strbuf buf = STRBUF_INIT;
263 FILE *f = fopen_or_warn(git_path("remotes/%s", remote->name), "r");
264
265 if (!f)
266 return;
267 remote->configured_in_repo = 1;
268 remote->origin = REMOTE_REMOTES;
269 while (strbuf_getline(&buf, f) != EOF) {
270 const char *v;
271
272 strbuf_rtrim(&buf);
273
274 if (skip_prefix(buf.buf, "URL:", &v))
275 add_url_alias(remote, xstrdup(skip_spaces(v)));
276 else if (skip_prefix(buf.buf, "Push:", &v))
277 add_push_refspec(remote, xstrdup(skip_spaces(v)));
278 else if (skip_prefix(buf.buf, "Pull:", &v))
279 add_fetch_refspec(remote, xstrdup(skip_spaces(v)));
280 }
281 strbuf_release(&buf);
282 fclose(f);
283 }
284
285 static void read_branches_file(struct remote *remote)
286 {
287 char *frag;
288 struct strbuf buf = STRBUF_INIT;
289 FILE *f = fopen_or_warn(git_path("branches/%s", remote->name), "r");
290
291 if (!f)
292 return;
293
294 strbuf_getline_lf(&buf, f);
295 fclose(f);
296 strbuf_trim(&buf);
297 if (!buf.len) {
298 strbuf_release(&buf);
299 return;
300 }
301
302 remote->configured_in_repo = 1;
303 remote->origin = REMOTE_BRANCHES;
304
305 /*
306 * The branches file would have URL and optionally
307 * #branch specified. The "master" (or specified) branch is
308 * fetched and stored in the local branch matching the
309 * remote name.
310 */
311 frag = strchr(buf.buf, '#');
312 if (frag)
313 *(frag++) = '\0';
314 else
315 frag = "master";
316
317 add_url_alias(remote, strbuf_detach(&buf, NULL));
318 add_fetch_refspec(remote, xstrfmt("refs/heads/%s:refs/heads/%s",
319 frag, remote->name));
320
321 /*
322 * Cogito compatible push: push current HEAD to remote #branch
323 * (master if missing)
324 */
325 add_push_refspec(remote, xstrfmt("HEAD:refs/heads/%s", frag));
326 remote->fetch_tags = 1; /* always auto-follow */
327 }
328
329 static int handle_config(const char *key, const char *value, void *cb)
330 {
331 const char *name;
332 int namelen;
333 const char *subkey;
334 struct remote *remote;
335 struct branch *branch;
336 if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
337 if (!name)
338 return 0;
339 branch = make_branch(name, namelen);
340 if (!strcmp(subkey, "remote")) {
341 return git_config_string(&branch->remote_name, key, value);
342 } else if (!strcmp(subkey, "pushremote")) {
343 return git_config_string(&branch->pushremote_name, key, value);
344 } else if (!strcmp(subkey, "merge")) {
345 if (!value)
346 return config_error_nonbool(key);
347 add_merge(branch, xstrdup(value));
348 }
349 return 0;
350 }
351 if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
352 struct rewrite *rewrite;
353 if (!name)
354 return 0;
355 if (!strcmp(subkey, "insteadof")) {
356 rewrite = make_rewrite(&rewrites, name, namelen);
357 if (!value)
358 return config_error_nonbool(key);
359 add_instead_of(rewrite, xstrdup(value));
360 } else if (!strcmp(subkey, "pushinsteadof")) {
361 rewrite = make_rewrite(&rewrites_push, name, namelen);
362 if (!value)
363 return config_error_nonbool(key);
364 add_instead_of(rewrite, xstrdup(value));
365 }
366 }
367
368 if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
369 return 0;
370
371 /* Handle remote.* variables */
372 if (!name && !strcmp(subkey, "pushdefault"))
373 return git_config_string(&pushremote_name, key, value);
374
375 if (!name)
376 return 0;
377 /* Handle remote.<name>.* variables */
378 if (*name == '/') {
379 warning("Config remote shorthand cannot begin with '/': %s",
380 name);
381 return 0;
382 }
383 remote = make_remote(name, namelen);
384 remote->origin = REMOTE_CONFIG;
385 if (current_config_scope() == CONFIG_SCOPE_REPO)
386 remote->configured_in_repo = 1;
387 if (!strcmp(subkey, "mirror"))
388 remote->mirror = git_config_bool(key, value);
389 else if (!strcmp(subkey, "skipdefaultupdate"))
390 remote->skip_default_update = git_config_bool(key, value);
391 else if (!strcmp(subkey, "skipfetchall"))
392 remote->skip_default_update = git_config_bool(key, value);
393 else if (!strcmp(subkey, "prune"))
394 remote->prune = git_config_bool(key, value);
395 else if (!strcmp(subkey, "url")) {
396 const char *v;
397 if (git_config_string(&v, key, value))
398 return -1;
399 add_url(remote, v);
400 } else if (!strcmp(subkey, "pushurl")) {
401 const char *v;
402 if (git_config_string(&v, key, value))
403 return -1;
404 add_pushurl(remote, v);
405 } else if (!strcmp(subkey, "push")) {
406 const char *v;
407 if (git_config_string(&v, key, value))
408 return -1;
409 add_push_refspec(remote, v);
410 } else if (!strcmp(subkey, "fetch")) {
411 const char *v;
412 if (git_config_string(&v, key, value))
413 return -1;
414 add_fetch_refspec(remote, v);
415 } else if (!strcmp(subkey, "receivepack")) {
416 const char *v;
417 if (git_config_string(&v, key, value))
418 return -1;
419 if (!remote->receivepack)
420 remote->receivepack = v;
421 else
422 error("more than one receivepack given, using the first");
423 } else if (!strcmp(subkey, "uploadpack")) {
424 const char *v;
425 if (git_config_string(&v, key, value))
426 return -1;
427 if (!remote->uploadpack)
428 remote->uploadpack = v;
429 else
430 error("more than one uploadpack given, using the first");
431 } else if (!strcmp(subkey, "tagopt")) {
432 if (!strcmp(value, "--no-tags"))
433 remote->fetch_tags = -1;
434 else if (!strcmp(value, "--tags"))
435 remote->fetch_tags = 2;
436 } else if (!strcmp(subkey, "proxy")) {
437 return git_config_string((const char **)&remote->http_proxy,
438 key, value);
439 } else if (!strcmp(subkey, "proxyauthmethod")) {
440 return git_config_string((const char **)&remote->http_proxy_authmethod,
441 key, value);
442 } else if (!strcmp(subkey, "vcs")) {
443 return git_config_string(&remote->foreign_vcs, key, value);
444 }
445 return 0;
446 }
447
448 static void alias_all_urls(void)
449 {
450 int i, j;
451 for (i = 0; i < remotes_nr; i++) {
452 int add_pushurl_aliases;
453 if (!remotes[i])
454 continue;
455 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
456 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
457 }
458 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
459 for (j = 0; j < remotes[i]->url_nr; j++) {
460 if (add_pushurl_aliases)
461 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
462 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
463 }
464 }
465 }
466
467 static void read_config(void)
468 {
469 static int loaded;
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, NULL, &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 const char *remote_ref_for_branch(struct branch *branch, int for_push,
680 int *explicit)
681 {
682 if (branch) {
683 if (!for_push) {
684 if (branch->merge_nr) {
685 if (explicit)
686 *explicit = 1;
687 return branch->merge_name[0];
688 }
689 } else {
690 const char *dst, *remote_name =
691 pushremote_for_branch(branch, NULL);
692 struct remote *remote = remote_get(remote_name);
693
694 if (remote && remote->push_refspec_nr &&
695 (dst = apply_refspecs(remote->push,
696 remote->push_refspec_nr,
697 branch->refname))) {
698 if (explicit)
699 *explicit = 1;
700 return dst;
701 }
702 }
703 }
704 if (explicit)
705 *explicit = 0;
706 return "";
707 }
708
709 static struct remote *remote_get_1(const char *name,
710 const char *(*get_default)(struct branch *, int *))
711 {
712 struct remote *ret;
713 int name_given = 0;
714
715 read_config();
716
717 if (name)
718 name_given = 1;
719 else
720 name = get_default(current_branch, &name_given);
721
722 ret = make_remote(name, 0);
723 if (valid_remote_nick(name) && have_git_dir()) {
724 if (!valid_remote(ret))
725 read_remotes_file(ret);
726 if (!valid_remote(ret))
727 read_branches_file(ret);
728 }
729 if (name_given && !valid_remote(ret))
730 add_url_alias(ret, name);
731 if (!valid_remote(ret))
732 return NULL;
733 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
734 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
735 return ret;
736 }
737
738 struct remote *remote_get(const char *name)
739 {
740 return remote_get_1(name, remote_for_branch);
741 }
742
743 struct remote *pushremote_get(const char *name)
744 {
745 return remote_get_1(name, pushremote_for_branch);
746 }
747
748 int remote_is_configured(struct remote *remote, int in_repo)
749 {
750 if (!remote)
751 return 0;
752 if (in_repo)
753 return remote->configured_in_repo;
754 return !!remote->origin;
755 }
756
757 int for_each_remote(each_remote_fn fn, void *priv)
758 {
759 int i, result = 0;
760 read_config();
761 for (i = 0; i < remotes_nr && !result; i++) {
762 struct remote *r = remotes[i];
763 if (!r)
764 continue;
765 if (!r->fetch)
766 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
767 r->fetch_refspec);
768 if (!r->push)
769 r->push = parse_push_refspec(r->push_refspec_nr,
770 r->push_refspec);
771 result = fn(r, priv);
772 }
773 return result;
774 }
775
776 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
777 {
778 if (strcmp(ref1->name, ref2->name)) {
779 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
780 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
781 die(_("Cannot fetch both %s and %s to %s"),
782 ref1->name, ref2->name, ref2->peer_ref->name);
783 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
784 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
785 warning(_("%s usually tracks %s, not %s"),
786 ref2->peer_ref->name, ref2->name, ref1->name);
787 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
788 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
789 die(_("%s tracks both %s and %s"),
790 ref2->peer_ref->name, ref1->name, ref2->name);
791 } else {
792 /*
793 * This last possibility doesn't occur because
794 * FETCH_HEAD_IGNORE entries always appear at
795 * the end of the list.
796 */
797 die(_("Internal error"));
798 }
799 }
800 free(ref2->peer_ref);
801 free(ref2);
802 }
803
804 struct ref *ref_remove_duplicates(struct ref *ref_map)
805 {
806 struct string_list refs = STRING_LIST_INIT_NODUP;
807 struct ref *retval = NULL;
808 struct ref **p = &retval;
809
810 while (ref_map) {
811 struct ref *ref = ref_map;
812
813 ref_map = ref_map->next;
814 ref->next = NULL;
815
816 if (!ref->peer_ref) {
817 *p = ref;
818 p = &ref->next;
819 } else {
820 struct string_list_item *item =
821 string_list_insert(&refs, ref->peer_ref->name);
822
823 if (item->util) {
824 /* Entry already existed */
825 handle_duplicate((struct ref *)item->util, ref);
826 } else {
827 *p = ref;
828 p = &ref->next;
829 item->util = ref;
830 }
831 }
832 }
833
834 string_list_clear(&refs, 0);
835 return retval;
836 }
837
838 int remote_has_url(struct remote *remote, const char *url)
839 {
840 int i;
841 for (i = 0; i < remote->url_nr; i++) {
842 if (!strcmp(remote->url[i], url))
843 return 1;
844 }
845 return 0;
846 }
847
848 static int match_name_with_pattern(const char *key, const char *name,
849 const char *value, char **result)
850 {
851 const char *kstar = strchr(key, '*');
852 size_t klen;
853 size_t ksuffixlen;
854 size_t namelen;
855 int ret;
856 if (!kstar)
857 die("Key '%s' of pattern had no '*'", key);
858 klen = kstar - key;
859 ksuffixlen = strlen(kstar + 1);
860 namelen = strlen(name);
861 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
862 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
863 if (ret && value) {
864 struct strbuf sb = STRBUF_INIT;
865 const char *vstar = strchr(value, '*');
866 if (!vstar)
867 die("Value '%s' of pattern has no '*'", value);
868 strbuf_add(&sb, value, vstar - value);
869 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
870 strbuf_addstr(&sb, vstar + 1);
871 *result = strbuf_detach(&sb, NULL);
872 }
873 return ret;
874 }
875
876 static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
877 {
878 int i;
879 int find_src = !query->src;
880
881 if (find_src && !query->dst)
882 error("query_refspecs_multiple: need either src or dst");
883
884 for (i = 0; i < ref_count; i++) {
885 struct refspec *refspec = &refs[i];
886 const char *key = find_src ? refspec->dst : refspec->src;
887 const char *value = find_src ? refspec->src : refspec->dst;
888 const char *needle = find_src ? query->dst : query->src;
889 char **result = find_src ? &query->src : &query->dst;
890
891 if (!refspec->dst)
892 continue;
893 if (refspec->pattern) {
894 if (match_name_with_pattern(key, needle, value, result))
895 string_list_append_nodup(results, *result);
896 } else if (!strcmp(needle, key)) {
897 string_list_append(results, value);
898 }
899 }
900 }
901
902 int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
903 {
904 int i;
905 int find_src = !query->src;
906 const char *needle = find_src ? query->dst : query->src;
907 char **result = find_src ? &query->src : &query->dst;
908
909 if (find_src && !query->dst)
910 return error("query_refspecs: need either src or dst");
911
912 for (i = 0; i < ref_count; i++) {
913 struct refspec *refspec = &refs[i];
914 const char *key = find_src ? refspec->dst : refspec->src;
915 const char *value = find_src ? refspec->src : refspec->dst;
916
917 if (!refspec->dst)
918 continue;
919 if (refspec->pattern) {
920 if (match_name_with_pattern(key, needle, value, result)) {
921 query->force = refspec->force;
922 return 0;
923 }
924 } else if (!strcmp(needle, key)) {
925 *result = xstrdup(value);
926 query->force = refspec->force;
927 return 0;
928 }
929 }
930 return -1;
931 }
932
933 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
934 const char *name)
935 {
936 struct refspec query;
937
938 memset(&query, 0, sizeof(struct refspec));
939 query.src = (char *)name;
940
941 if (query_refspecs(refspecs, nr_refspec, &query))
942 return NULL;
943
944 return query.dst;
945 }
946
947 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
948 {
949 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
950 }
951
952 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
953 const char *name)
954 {
955 size_t len = strlen(name);
956 struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
957 memcpy(ref->name, prefix, prefixlen);
958 memcpy(ref->name + prefixlen, name, len);
959 return ref;
960 }
961
962 struct ref *alloc_ref(const char *name)
963 {
964 return alloc_ref_with_prefix("", 0, name);
965 }
966
967 struct ref *copy_ref(const struct ref *ref)
968 {
969 struct ref *cpy;
970 size_t len;
971 if (!ref)
972 return NULL;
973 len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
974 cpy = xmalloc(len);
975 memcpy(cpy, ref, len);
976 cpy->next = NULL;
977 cpy->symref = xstrdup_or_null(ref->symref);
978 cpy->remote_status = xstrdup_or_null(ref->remote_status);
979 cpy->peer_ref = copy_ref(ref->peer_ref);
980 return cpy;
981 }
982
983 struct ref *copy_ref_list(const struct ref *ref)
984 {
985 struct ref *ret = NULL;
986 struct ref **tail = &ret;
987 while (ref) {
988 *tail = copy_ref(ref);
989 ref = ref->next;
990 tail = &((*tail)->next);
991 }
992 return ret;
993 }
994
995 static void free_ref(struct ref *ref)
996 {
997 if (!ref)
998 return;
999 free_ref(ref->peer_ref);
1000 free(ref->remote_status);
1001 free(ref->symref);
1002 free(ref);
1003 }
1004
1005 void free_refs(struct ref *ref)
1006 {
1007 struct ref *next;
1008 while (ref) {
1009 next = ref->next;
1010 free_ref(ref);
1011 ref = next;
1012 }
1013 }
1014
1015 int ref_compare_name(const void *va, const void *vb)
1016 {
1017 const struct ref *a = va, *b = vb;
1018 return strcmp(a->name, b->name);
1019 }
1020
1021 static void *ref_list_get_next(const void *a)
1022 {
1023 return ((const struct ref *)a)->next;
1024 }
1025
1026 static void ref_list_set_next(void *a, void *next)
1027 {
1028 ((struct ref *)a)->next = next;
1029 }
1030
1031 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1032 {
1033 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1034 }
1035
1036 int count_refspec_match(const char *pattern,
1037 struct ref *refs,
1038 struct ref **matched_ref)
1039 {
1040 int patlen = strlen(pattern);
1041 struct ref *matched_weak = NULL;
1042 struct ref *matched = NULL;
1043 int weak_match = 0;
1044 int match = 0;
1045
1046 for (weak_match = match = 0; refs; refs = refs->next) {
1047 char *name = refs->name;
1048 int namelen = strlen(name);
1049
1050 if (!refname_match(pattern, name))
1051 continue;
1052
1053 /* A match is "weak" if it is with refs outside
1054 * heads or tags, and did not specify the pattern
1055 * in full (e.g. "refs/remotes/origin/master") or at
1056 * least from the toplevel (e.g. "remotes/origin/master");
1057 * otherwise "git push $URL master" would result in
1058 * ambiguity between remotes/origin/master and heads/master
1059 * at the remote site.
1060 */
1061 if (namelen != patlen &&
1062 patlen != namelen - 5 &&
1063 !starts_with(name, "refs/heads/") &&
1064 !starts_with(name, "refs/tags/")) {
1065 /* We want to catch the case where only weak
1066 * matches are found and there are multiple
1067 * matches, and where more than one strong
1068 * matches are found, as ambiguous. One
1069 * strong match with zero or more weak matches
1070 * are acceptable as a unique match.
1071 */
1072 matched_weak = refs;
1073 weak_match++;
1074 }
1075 else {
1076 matched = refs;
1077 match++;
1078 }
1079 }
1080 if (!matched) {
1081 if (matched_ref)
1082 *matched_ref = matched_weak;
1083 return weak_match;
1084 }
1085 else {
1086 if (matched_ref)
1087 *matched_ref = matched;
1088 return match;
1089 }
1090 }
1091
1092 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1093 {
1094 **tail = ref;
1095 while (ref->next)
1096 ref = ref->next;
1097 *tail = &ref->next;
1098 }
1099
1100 static struct ref *alloc_delete_ref(void)
1101 {
1102 struct ref *ref = alloc_ref("(delete)");
1103 oidclr(&ref->new_oid);
1104 return ref;
1105 }
1106
1107 static int try_explicit_object_name(const char *name,
1108 struct ref **match)
1109 {
1110 struct object_id oid;
1111
1112 if (!*name) {
1113 if (match)
1114 *match = alloc_delete_ref();
1115 return 0;
1116 }
1117
1118 if (get_oid(name, &oid))
1119 return -1;
1120
1121 if (match) {
1122 *match = alloc_ref(name);
1123 oidcpy(&(*match)->new_oid, &oid);
1124 }
1125 return 0;
1126 }
1127
1128 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1129 {
1130 struct ref *ret = alloc_ref(name);
1131 tail_link_ref(ret, tail);
1132 return ret;
1133 }
1134
1135 static char *guess_ref(const char *name, struct ref *peer)
1136 {
1137 struct strbuf buf = STRBUF_INIT;
1138
1139 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1140 NULL, NULL);
1141 if (!r)
1142 return NULL;
1143
1144 if (starts_with(r, "refs/heads/"))
1145 strbuf_addstr(&buf, "refs/heads/");
1146 else if (starts_with(r, "refs/tags/"))
1147 strbuf_addstr(&buf, "refs/tags/");
1148 else
1149 return NULL;
1150
1151 strbuf_addstr(&buf, name);
1152 return strbuf_detach(&buf, NULL);
1153 }
1154
1155 static int match_explicit_lhs(struct ref *src,
1156 struct refspec *rs,
1157 struct ref **match,
1158 int *allocated_match)
1159 {
1160 switch (count_refspec_match(rs->src, src, match)) {
1161 case 1:
1162 if (allocated_match)
1163 *allocated_match = 0;
1164 return 0;
1165 case 0:
1166 /* The source could be in the get_sha1() format
1167 * not a reference name. :refs/other is a
1168 * way to delete 'other' ref at the remote end.
1169 */
1170 if (try_explicit_object_name(rs->src, match) < 0)
1171 return error("src refspec %s does not match any.", rs->src);
1172 if (allocated_match)
1173 *allocated_match = 1;
1174 return 0;
1175 default:
1176 return error("src refspec %s matches more than one.", rs->src);
1177 }
1178 }
1179
1180 static int match_explicit(struct ref *src, struct ref *dst,
1181 struct ref ***dst_tail,
1182 struct refspec *rs)
1183 {
1184 struct ref *matched_src, *matched_dst;
1185 int allocated_src;
1186
1187 const char *dst_value = rs->dst;
1188 char *dst_guess;
1189
1190 if (rs->pattern || rs->matching)
1191 return 0;
1192
1193 matched_src = matched_dst = NULL;
1194 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1195 return -1;
1196
1197 if (!dst_value) {
1198 int flag;
1199
1200 dst_value = resolve_ref_unsafe(matched_src->name,
1201 RESOLVE_REF_READING,
1202 NULL, &flag);
1203 if (!dst_value ||
1204 ((flag & REF_ISSYMREF) &&
1205 !starts_with(dst_value, "refs/heads/")))
1206 die("%s cannot be resolved to branch.",
1207 matched_src->name);
1208 }
1209
1210 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1211 case 1:
1212 break;
1213 case 0:
1214 if (starts_with(dst_value, "refs/"))
1215 matched_dst = make_linked_ref(dst_value, dst_tail);
1216 else if (is_null_oid(&matched_src->new_oid))
1217 error("unable to delete '%s': remote ref does not exist",
1218 dst_value);
1219 else if ((dst_guess = guess_ref(dst_value, matched_src))) {
1220 matched_dst = make_linked_ref(dst_guess, dst_tail);
1221 free(dst_guess);
1222 } else
1223 error("unable to push to unqualified destination: %s\n"
1224 "The destination refspec neither matches an "
1225 "existing ref on the remote nor\n"
1226 "begins with refs/, and we are unable to "
1227 "guess a prefix based on the source ref.",
1228 dst_value);
1229 break;
1230 default:
1231 matched_dst = NULL;
1232 error("dst refspec %s matches more than one.",
1233 dst_value);
1234 break;
1235 }
1236 if (!matched_dst)
1237 return -1;
1238 if (matched_dst->peer_ref)
1239 return error("dst ref %s receives from more than one src.",
1240 matched_dst->name);
1241 else {
1242 matched_dst->peer_ref = allocated_src ?
1243 matched_src :
1244 copy_ref(matched_src);
1245 matched_dst->force = rs->force;
1246 }
1247 return 0;
1248 }
1249
1250 static int match_explicit_refs(struct ref *src, struct ref *dst,
1251 struct ref ***dst_tail, struct refspec *rs,
1252 int rs_nr)
1253 {
1254 int i, errs;
1255 for (i = errs = 0; i < rs_nr; i++)
1256 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1257 return errs;
1258 }
1259
1260 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1261 int send_mirror, int direction, const struct refspec **ret_pat)
1262 {
1263 const struct refspec *pat;
1264 char *name;
1265 int i;
1266 int matching_refs = -1;
1267 for (i = 0; i < rs_nr; i++) {
1268 if (rs[i].matching &&
1269 (matching_refs == -1 || rs[i].force)) {
1270 matching_refs = i;
1271 continue;
1272 }
1273
1274 if (rs[i].pattern) {
1275 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1276 int match;
1277 if (direction == FROM_SRC)
1278 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1279 else
1280 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1281 if (match) {
1282 matching_refs = i;
1283 break;
1284 }
1285 }
1286 }
1287 if (matching_refs == -1)
1288 return NULL;
1289
1290 pat = rs + matching_refs;
1291 if (pat->matching) {
1292 /*
1293 * "matching refs"; traditionally we pushed everything
1294 * including refs outside refs/heads/ hierarchy, but
1295 * that does not make much sense these days.
1296 */
1297 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1298 return NULL;
1299 name = xstrdup(ref->name);
1300 }
1301 if (ret_pat)
1302 *ret_pat = pat;
1303 return name;
1304 }
1305
1306 static struct ref **tail_ref(struct ref **head)
1307 {
1308 struct ref **tail = head;
1309 while (*tail)
1310 tail = &((*tail)->next);
1311 return tail;
1312 }
1313
1314 struct tips {
1315 struct commit **tip;
1316 int nr, alloc;
1317 };
1318
1319 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1320 {
1321 struct commit *commit;
1322
1323 if (is_null_oid(oid))
1324 return;
1325 commit = lookup_commit_reference_gently(oid, 1);
1326 if (!commit || (commit->object.flags & TMP_MARK))
1327 return;
1328 commit->object.flags |= TMP_MARK;
1329 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1330 tips->tip[tips->nr++] = commit;
1331 }
1332
1333 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1334 {
1335 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1336 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1337 struct string_list_item *item;
1338 struct ref *ref;
1339 struct tips sent_tips;
1340
1341 /*
1342 * Collect everything we know they would have at the end of
1343 * this push, and collect all tags they have.
1344 */
1345 memset(&sent_tips, 0, sizeof(sent_tips));
1346 for (ref = *dst; ref; ref = ref->next) {
1347 if (ref->peer_ref &&
1348 !is_null_oid(&ref->peer_ref->new_oid))
1349 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1350 else
1351 add_to_tips(&sent_tips, &ref->old_oid);
1352 if (starts_with(ref->name, "refs/tags/"))
1353 string_list_append(&dst_tag, ref->name);
1354 }
1355 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1356
1357 string_list_sort(&dst_tag);
1358
1359 /* Collect tags they do not have. */
1360 for (ref = src; ref; ref = ref->next) {
1361 if (!starts_with(ref->name, "refs/tags/"))
1362 continue; /* not a tag */
1363 if (string_list_has_string(&dst_tag, ref->name))
1364 continue; /* they already have it */
1365 if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
1366 continue; /* be conservative */
1367 item = string_list_append(&src_tag, ref->name);
1368 item->util = ref;
1369 }
1370 string_list_clear(&dst_tag, 0);
1371
1372 /*
1373 * At this point, src_tag lists tags that are missing from
1374 * dst, and sent_tips lists the tips we are pushing or those
1375 * that we know they already have. An element in the src_tag
1376 * that is an ancestor of any of the sent_tips needs to be
1377 * sent to the other side.
1378 */
1379 if (sent_tips.nr) {
1380 for_each_string_list_item(item, &src_tag) {
1381 struct ref *ref = item->util;
1382 struct ref *dst_ref;
1383 struct commit *commit;
1384
1385 if (is_null_oid(&ref->new_oid))
1386 continue;
1387 commit = lookup_commit_reference_gently(&ref->new_oid,
1388 1);
1389 if (!commit)
1390 /* not pushing a commit, which is not an error */
1391 continue;
1392
1393 /*
1394 * Is this tag, which they do not have, reachable from
1395 * any of the commits we are sending?
1396 */
1397 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1398 continue;
1399
1400 /* Add it in */
1401 dst_ref = make_linked_ref(ref->name, dst_tail);
1402 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1403 dst_ref->peer_ref = copy_ref(ref);
1404 }
1405 }
1406 string_list_clear(&src_tag, 0);
1407 free(sent_tips.tip);
1408 }
1409
1410 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1411 {
1412 for ( ; list; list = list->next)
1413 if (!strcmp(list->name, name))
1414 return (struct ref *)list;
1415 return NULL;
1416 }
1417
1418 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1419 {
1420 for ( ; ref; ref = ref->next)
1421 string_list_append_nodup(ref_index, ref->name)->util = ref;
1422
1423 string_list_sort(ref_index);
1424 }
1425
1426 /*
1427 * Given only the set of local refs, sanity-check the set of push
1428 * refspecs. We can't catch all errors that match_push_refs would,
1429 * but we can catch some errors early before even talking to the
1430 * remote side.
1431 */
1432 int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1433 {
1434 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1435 int ret = 0;
1436 int i;
1437
1438 for (i = 0; i < nr_refspec; i++) {
1439 struct refspec *rs = refspec + i;
1440
1441 if (rs->pattern || rs->matching)
1442 continue;
1443
1444 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1445 }
1446
1447 free_refspec(nr_refspec, refspec);
1448 return ret;
1449 }
1450
1451 /*
1452 * Given the set of refs the local repository has, the set of refs the
1453 * remote repository has, and the refspec used for push, determine
1454 * what remote refs we will update and with what value by setting
1455 * peer_ref (which object is being pushed) and force (if the push is
1456 * forced) in elements of "dst". The function may add new elements to
1457 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1458 */
1459 int match_push_refs(struct ref *src, struct ref **dst,
1460 int nr_refspec, const char **refspec, int flags)
1461 {
1462 struct refspec *rs;
1463 int send_all = flags & MATCH_REFS_ALL;
1464 int send_mirror = flags & MATCH_REFS_MIRROR;
1465 int send_prune = flags & MATCH_REFS_PRUNE;
1466 int errs;
1467 static const char *default_refspec[] = { ":", NULL };
1468 struct ref *ref, **dst_tail = tail_ref(dst);
1469 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1470
1471 if (!nr_refspec) {
1472 nr_refspec = 1;
1473 refspec = default_refspec;
1474 }
1475 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1476 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1477
1478 /* pick the remainder */
1479 for (ref = src; ref; ref = ref->next) {
1480 struct string_list_item *dst_item;
1481 struct ref *dst_peer;
1482 const struct refspec *pat = NULL;
1483 char *dst_name;
1484
1485 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1486 if (!dst_name)
1487 continue;
1488
1489 if (!dst_ref_index.nr)
1490 prepare_ref_index(&dst_ref_index, *dst);
1491
1492 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1493 dst_peer = dst_item ? dst_item->util : NULL;
1494 if (dst_peer) {
1495 if (dst_peer->peer_ref)
1496 /* We're already sending something to this ref. */
1497 goto free_name;
1498 } else {
1499 if (pat->matching && !(send_all || send_mirror))
1500 /*
1501 * Remote doesn't have it, and we have no
1502 * explicit pattern, and we don't have
1503 * --all or --mirror.
1504 */
1505 goto free_name;
1506
1507 /* Create a new one and link it */
1508 dst_peer = make_linked_ref(dst_name, &dst_tail);
1509 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1510 string_list_insert(&dst_ref_index,
1511 dst_peer->name)->util = dst_peer;
1512 }
1513 dst_peer->peer_ref = copy_ref(ref);
1514 dst_peer->force = pat->force;
1515 free_name:
1516 free(dst_name);
1517 }
1518
1519 string_list_clear(&dst_ref_index, 0);
1520
1521 if (flags & MATCH_REFS_FOLLOW_TAGS)
1522 add_missing_tags(src, dst, &dst_tail);
1523
1524 if (send_prune) {
1525 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1526 /* check for missing refs on the remote */
1527 for (ref = *dst; ref; ref = ref->next) {
1528 char *src_name;
1529
1530 if (ref->peer_ref)
1531 /* We're already sending something to this ref. */
1532 continue;
1533
1534 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1535 if (src_name) {
1536 if (!src_ref_index.nr)
1537 prepare_ref_index(&src_ref_index, src);
1538 if (!string_list_has_string(&src_ref_index,
1539 src_name))
1540 ref->peer_ref = alloc_delete_ref();
1541 free(src_name);
1542 }
1543 }
1544 string_list_clear(&src_ref_index, 0);
1545 }
1546 if (errs)
1547 return -1;
1548 return 0;
1549 }
1550
1551 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1552 int force_update)
1553 {
1554 struct ref *ref;
1555
1556 for (ref = remote_refs; ref; ref = ref->next) {
1557 int force_ref_update = ref->force || force_update;
1558 int reject_reason = 0;
1559
1560 if (ref->peer_ref)
1561 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1562 else if (!send_mirror)
1563 continue;
1564
1565 ref->deletion = is_null_oid(&ref->new_oid);
1566 if (!ref->deletion &&
1567 !oidcmp(&ref->old_oid, &ref->new_oid)) {
1568 ref->status = REF_STATUS_UPTODATE;
1569 continue;
1570 }
1571
1572 /*
1573 * If the remote ref has moved and is now different
1574 * from what we expect, reject any push.
1575 *
1576 * It also is an error if the user told us to check
1577 * with the remote-tracking branch to find the value
1578 * to expect, but we did not have such a tracking
1579 * branch.
1580 */
1581 if (ref->expect_old_sha1) {
1582 if (oidcmp(&ref->old_oid, &ref->old_oid_expect))
1583 reject_reason = REF_STATUS_REJECT_STALE;
1584 else
1585 /* If the ref isn't stale then force the update. */
1586 force_ref_update = 1;
1587 }
1588
1589 /*
1590 * If the update isn't already rejected then check
1591 * the usual "must fast-forward" rules.
1592 *
1593 * Decide whether an individual refspec A:B can be
1594 * pushed. The push will succeed if any of the
1595 * following are true:
1596 *
1597 * (1) the remote reference B does not exist
1598 *
1599 * (2) the remote reference B is being removed (i.e.,
1600 * pushing :B where no source is specified)
1601 *
1602 * (3) the destination is not under refs/tags/, and
1603 * if the old and new value is a commit, the new
1604 * is a descendant of the old.
1605 *
1606 * (4) it is forced using the +A:B notation, or by
1607 * passing the --force argument
1608 */
1609
1610 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1611 if (starts_with(ref->name, "refs/tags/"))
1612 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1613 else if (!has_object_file(&ref->old_oid))
1614 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1615 else if (!lookup_commit_reference_gently(&ref->old_oid, 1) ||
1616 !lookup_commit_reference_gently(&ref->new_oid, 1))
1617 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1618 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1619 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1620 }
1621
1622 /*
1623 * "--force" will defeat any rejection implemented
1624 * by the rules above.
1625 */
1626 if (!force_ref_update)
1627 ref->status = reject_reason;
1628 else if (reject_reason)
1629 ref->forced_update = 1;
1630 }
1631 }
1632
1633 static void set_merge(struct branch *ret)
1634 {
1635 struct remote *remote;
1636 char *ref;
1637 struct object_id oid;
1638 int i;
1639
1640 if (!ret)
1641 return; /* no branch */
1642 if (ret->merge)
1643 return; /* already run */
1644 if (!ret->remote_name || !ret->merge_nr) {
1645 /*
1646 * no merge config; let's make sure we don't confuse callers
1647 * with a non-zero merge_nr but a NULL merge
1648 */
1649 ret->merge_nr = 0;
1650 return;
1651 }
1652
1653 remote = remote_get(ret->remote_name);
1654
1655 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1656 for (i = 0; i < ret->merge_nr; i++) {
1657 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1658 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1659 if (!remote_find_tracking(remote, ret->merge[i]) ||
1660 strcmp(ret->remote_name, "."))
1661 continue;
1662 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1663 &oid, &ref) == 1)
1664 ret->merge[i]->dst = ref;
1665 else
1666 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1667 }
1668 }
1669
1670 struct branch *branch_get(const char *name)
1671 {
1672 struct branch *ret;
1673
1674 read_config();
1675 if (!name || !*name || !strcmp(name, "HEAD"))
1676 ret = current_branch;
1677 else
1678 ret = make_branch(name, 0);
1679 set_merge(ret);
1680 return ret;
1681 }
1682
1683 int branch_has_merge_config(struct branch *branch)
1684 {
1685 return branch && !!branch->merge;
1686 }
1687
1688 int branch_merge_matches(struct branch *branch,
1689 int i,
1690 const char *refname)
1691 {
1692 if (!branch || i < 0 || i >= branch->merge_nr)
1693 return 0;
1694 return refname_match(branch->merge[i]->src, refname);
1695 }
1696
1697 __attribute__((format (printf,2,3)))
1698 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1699 {
1700 if (err) {
1701 va_list ap;
1702 va_start(ap, fmt);
1703 strbuf_vaddf(err, fmt, ap);
1704 va_end(ap);
1705 }
1706 return NULL;
1707 }
1708
1709 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1710 {
1711 if (!branch)
1712 return error_buf(err, _("HEAD does not point to a branch"));
1713
1714 if (!branch->merge || !branch->merge[0]) {
1715 /*
1716 * no merge config; is it because the user didn't define any,
1717 * or because it is not a real branch, and get_branch
1718 * auto-vivified it?
1719 */
1720 if (!ref_exists(branch->refname))
1721 return error_buf(err, _("no such branch: '%s'"),
1722 branch->name);
1723 return error_buf(err,
1724 _("no upstream configured for branch '%s'"),
1725 branch->name);
1726 }
1727
1728 if (!branch->merge[0]->dst)
1729 return error_buf(err,
1730 _("upstream branch '%s' not stored as a remote-tracking branch"),
1731 branch->merge[0]->src);
1732
1733 return branch->merge[0]->dst;
1734 }
1735
1736 static const char *tracking_for_push_dest(struct remote *remote,
1737 const char *refname,
1738 struct strbuf *err)
1739 {
1740 char *ret;
1741
1742 ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1743 if (!ret)
1744 return error_buf(err,
1745 _("push destination '%s' on remote '%s' has no local tracking branch"),
1746 refname, remote->name);
1747 return ret;
1748 }
1749
1750 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1751 {
1752 struct remote *remote;
1753
1754 remote = remote_get(pushremote_for_branch(branch, NULL));
1755 if (!remote)
1756 return error_buf(err,
1757 _("branch '%s' has no remote for pushing"),
1758 branch->name);
1759
1760 if (remote->push_refspec_nr) {
1761 char *dst;
1762 const char *ret;
1763
1764 dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1765 branch->refname);
1766 if (!dst)
1767 return error_buf(err,
1768 _("push refspecs for '%s' do not include '%s'"),
1769 remote->name, branch->name);
1770
1771 ret = tracking_for_push_dest(remote, dst, err);
1772 free(dst);
1773 return ret;
1774 }
1775
1776 if (remote->mirror)
1777 return tracking_for_push_dest(remote, branch->refname, err);
1778
1779 switch (push_default) {
1780 case PUSH_DEFAULT_NOTHING:
1781 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1782
1783 case PUSH_DEFAULT_MATCHING:
1784 case PUSH_DEFAULT_CURRENT:
1785 return tracking_for_push_dest(remote, branch->refname, err);
1786
1787 case PUSH_DEFAULT_UPSTREAM:
1788 return branch_get_upstream(branch, err);
1789
1790 case PUSH_DEFAULT_UNSPECIFIED:
1791 case PUSH_DEFAULT_SIMPLE:
1792 {
1793 const char *up, *cur;
1794
1795 up = branch_get_upstream(branch, err);
1796 if (!up)
1797 return NULL;
1798 cur = tracking_for_push_dest(remote, branch->refname, err);
1799 if (!cur)
1800 return NULL;
1801 if (strcmp(cur, up))
1802 return error_buf(err,
1803 _("cannot resolve 'simple' push to a single destination"));
1804 return cur;
1805 }
1806 }
1807
1808 die("BUG: unhandled push situation");
1809 }
1810
1811 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1812 {
1813 if (!branch)
1814 return error_buf(err, _("HEAD does not point to a branch"));
1815
1816 if (!branch->push_tracking_ref)
1817 branch->push_tracking_ref = branch_get_push_1(branch, err);
1818 return branch->push_tracking_ref;
1819 }
1820
1821 static int ignore_symref_update(const char *refname)
1822 {
1823 int flag;
1824
1825 if (!resolve_ref_unsafe(refname, 0, NULL, &flag))
1826 return 0; /* non-existing refs are OK */
1827 return (flag & REF_ISSYMREF);
1828 }
1829
1830 /*
1831 * Create and return a list of (struct ref) consisting of copies of
1832 * each remote_ref that matches refspec. refspec must be a pattern.
1833 * Fill in the copies' peer_ref to describe the local tracking refs to
1834 * which they map. Omit any references that would map to an existing
1835 * local symbolic ref.
1836 */
1837 static struct ref *get_expanded_map(const struct ref *remote_refs,
1838 const struct refspec *refspec)
1839 {
1840 const struct ref *ref;
1841 struct ref *ret = NULL;
1842 struct ref **tail = &ret;
1843
1844 for (ref = remote_refs; ref; ref = ref->next) {
1845 char *expn_name = NULL;
1846
1847 if (strchr(ref->name, '^'))
1848 continue; /* a dereference item */
1849 if (match_name_with_pattern(refspec->src, ref->name,
1850 refspec->dst, &expn_name) &&
1851 !ignore_symref_update(expn_name)) {
1852 struct ref *cpy = copy_ref(ref);
1853
1854 cpy->peer_ref = alloc_ref(expn_name);
1855 if (refspec->force)
1856 cpy->peer_ref->force = 1;
1857 *tail = cpy;
1858 tail = &cpy->next;
1859 }
1860 free(expn_name);
1861 }
1862
1863 return ret;
1864 }
1865
1866 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1867 {
1868 const struct ref *ref;
1869 for (ref = refs; ref; ref = ref->next) {
1870 if (refname_match(name, ref->name))
1871 return ref;
1872 }
1873 return NULL;
1874 }
1875
1876 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1877 {
1878 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1879
1880 if (!ref)
1881 return NULL;
1882
1883 return copy_ref(ref);
1884 }
1885
1886 static struct ref *get_local_ref(const char *name)
1887 {
1888 if (!name || name[0] == '\0')
1889 return NULL;
1890
1891 if (starts_with(name, "refs/"))
1892 return alloc_ref(name);
1893
1894 if (starts_with(name, "heads/") ||
1895 starts_with(name, "tags/") ||
1896 starts_with(name, "remotes/"))
1897 return alloc_ref_with_prefix("refs/", 5, name);
1898
1899 return alloc_ref_with_prefix("refs/heads/", 11, name);
1900 }
1901
1902 int get_fetch_map(const struct ref *remote_refs,
1903 const struct refspec *refspec,
1904 struct ref ***tail,
1905 int missing_ok)
1906 {
1907 struct ref *ref_map, **rmp;
1908
1909 if (refspec->pattern) {
1910 ref_map = get_expanded_map(remote_refs, refspec);
1911 } else {
1912 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1913
1914 if (refspec->exact_sha1) {
1915 ref_map = alloc_ref(name);
1916 get_oid_hex(name, &ref_map->old_oid);
1917 } else {
1918 ref_map = get_remote_ref(remote_refs, name);
1919 }
1920 if (!missing_ok && !ref_map)
1921 die("Couldn't find remote ref %s", name);
1922 if (ref_map) {
1923 ref_map->peer_ref = get_local_ref(refspec->dst);
1924 if (ref_map->peer_ref && refspec->force)
1925 ref_map->peer_ref->force = 1;
1926 }
1927 }
1928
1929 for (rmp = &ref_map; *rmp; ) {
1930 if ((*rmp)->peer_ref) {
1931 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1932 check_refname_format((*rmp)->peer_ref->name, 0)) {
1933 struct ref *ignore = *rmp;
1934 error("* Ignoring funny ref '%s' locally",
1935 (*rmp)->peer_ref->name);
1936 *rmp = (*rmp)->next;
1937 free(ignore->peer_ref);
1938 free(ignore);
1939 continue;
1940 }
1941 }
1942 rmp = &((*rmp)->next);
1943 }
1944
1945 if (ref_map)
1946 tail_link_ref(ref_map, tail);
1947
1948 return 0;
1949 }
1950
1951 int resolve_remote_symref(struct ref *ref, struct ref *list)
1952 {
1953 if (!ref->symref)
1954 return 0;
1955 for (; list; list = list->next)
1956 if (!strcmp(ref->symref, list->name)) {
1957 oidcpy(&ref->old_oid, &list->old_oid);
1958 return 0;
1959 }
1960 return 1;
1961 }
1962
1963 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1964 {
1965 while (list) {
1966 struct commit *commit = pop_commit(&list);
1967 commit->object.flags &= ~mark;
1968 }
1969 }
1970
1971 int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
1972 {
1973 struct object *o;
1974 struct commit *old, *new;
1975 struct commit_list *list, *used;
1976 int found = 0;
1977
1978 /*
1979 * Both new and old must be commit-ish and new is descendant of
1980 * old. Otherwise we require --force.
1981 */
1982 o = deref_tag(parse_object(old_oid), NULL, 0);
1983 if (!o || o->type != OBJ_COMMIT)
1984 return 0;
1985 old = (struct commit *) o;
1986
1987 o = deref_tag(parse_object(new_oid), NULL, 0);
1988 if (!o || o->type != OBJ_COMMIT)
1989 return 0;
1990 new = (struct commit *) o;
1991
1992 if (parse_commit(new) < 0)
1993 return 0;
1994
1995 used = list = NULL;
1996 commit_list_insert(new, &list);
1997 while (list) {
1998 new = pop_most_recent_commit(&list, TMP_MARK);
1999 commit_list_insert(new, &used);
2000 if (new == old) {
2001 found = 1;
2002 break;
2003 }
2004 }
2005 unmark_and_free(list, TMP_MARK);
2006 unmark_and_free(used, TMP_MARK);
2007 return found;
2008 }
2009
2010 /*
2011 * Compare a branch with its upstream, and save their differences (number
2012 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
2013 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
2014 * is not itself NULL.
2015 *
2016 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
2017 * upstream defined, or ref does not exist), 0 otherwise.
2018 */
2019 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
2020 const char **upstream_name)
2021 {
2022 struct object_id oid;
2023 struct commit *ours, *theirs;
2024 struct rev_info revs;
2025 const char *base;
2026 struct argv_array argv = ARGV_ARRAY_INIT;
2027
2028 /* Cannot stat unless we are marked to build on top of somebody else. */
2029 base = branch_get_upstream(branch, NULL);
2030 if (upstream_name)
2031 *upstream_name = base;
2032 if (!base)
2033 return -1;
2034
2035 /* Cannot stat if what we used to build on no longer exists */
2036 if (read_ref(base, &oid))
2037 return -1;
2038 theirs = lookup_commit_reference(&oid);
2039 if (!theirs)
2040 return -1;
2041
2042 if (read_ref(branch->refname, &oid))
2043 return -1;
2044 ours = lookup_commit_reference(&oid);
2045 if (!ours)
2046 return -1;
2047
2048 /* are we the same? */
2049 if (theirs == ours) {
2050 *num_theirs = *num_ours = 0;
2051 return 0;
2052 }
2053
2054 /* Run "rev-list --left-right ours...theirs" internally... */
2055 argv_array_push(&argv, ""); /* ignored */
2056 argv_array_push(&argv, "--left-right");
2057 argv_array_pushf(&argv, "%s...%s",
2058 oid_to_hex(&ours->object.oid),
2059 oid_to_hex(&theirs->object.oid));
2060 argv_array_push(&argv, "--");
2061
2062 init_revisions(&revs, NULL);
2063 setup_revisions(argv.argc, argv.argv, &revs, NULL);
2064 if (prepare_revision_walk(&revs))
2065 die("revision walk setup failed");
2066
2067 /* ... and count the commits on each side. */
2068 *num_ours = 0;
2069 *num_theirs = 0;
2070 while (1) {
2071 struct commit *c = get_revision(&revs);
2072 if (!c)
2073 break;
2074 if (c->object.flags & SYMMETRIC_LEFT)
2075 (*num_ours)++;
2076 else
2077 (*num_theirs)++;
2078 }
2079
2080 /* clear object flags smudged by the above traversal */
2081 clear_commit_marks(ours, ALL_REV_FLAGS);
2082 clear_commit_marks(theirs, ALL_REV_FLAGS);
2083
2084 argv_array_clear(&argv);
2085 return 0;
2086 }
2087
2088 /*
2089 * Return true when there is anything to report, otherwise false.
2090 */
2091 int format_tracking_info(struct branch *branch, struct strbuf *sb)
2092 {
2093 int ours, theirs;
2094 const char *full_base;
2095 char *base;
2096 int upstream_is_gone = 0;
2097
2098 if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2099 if (!full_base)
2100 return 0;
2101 upstream_is_gone = 1;
2102 }
2103
2104 base = shorten_unambiguous_ref(full_base, 0);
2105 if (upstream_is_gone) {
2106 strbuf_addf(sb,
2107 _("Your branch is based on '%s', but the upstream is gone.\n"),
2108 base);
2109 if (advice_status_hints)
2110 strbuf_addstr(sb,
2111 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2112 } else if (!ours && !theirs) {
2113 strbuf_addf(sb,
2114 _("Your branch is up to date with '%s'.\n"),
2115 base);
2116 } else if (!theirs) {
2117 strbuf_addf(sb,
2118 Q_("Your branch is ahead of '%s' by %d commit.\n",
2119 "Your branch is ahead of '%s' by %d commits.\n",
2120 ours),
2121 base, ours);
2122 if (advice_status_hints)
2123 strbuf_addstr(sb,
2124 _(" (use \"git push\" to publish your local commits)\n"));
2125 } else if (!ours) {
2126 strbuf_addf(sb,
2127 Q_("Your branch is behind '%s' by %d commit, "
2128 "and can be fast-forwarded.\n",
2129 "Your branch is behind '%s' by %d commits, "
2130 "and can be fast-forwarded.\n",
2131 theirs),
2132 base, theirs);
2133 if (advice_status_hints)
2134 strbuf_addstr(sb,
2135 _(" (use \"git pull\" to update your local branch)\n"));
2136 } else {
2137 strbuf_addf(sb,
2138 Q_("Your branch and '%s' have diverged,\n"
2139 "and have %d and %d different commit each, "
2140 "respectively.\n",
2141 "Your branch and '%s' have diverged,\n"
2142 "and have %d and %d different commits each, "
2143 "respectively.\n",
2144 ours + theirs),
2145 base, ours, theirs);
2146 if (advice_status_hints)
2147 strbuf_addstr(sb,
2148 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2149 }
2150 free(base);
2151 return 1;
2152 }
2153
2154 static int one_local_ref(const char *refname, const struct object_id *oid,
2155 int flag, void *cb_data)
2156 {
2157 struct ref ***local_tail = cb_data;
2158 struct ref *ref;
2159
2160 /* we already know it starts with refs/ to get here */
2161 if (check_refname_format(refname + 5, 0))
2162 return 0;
2163
2164 ref = alloc_ref(refname);
2165 oidcpy(&ref->new_oid, oid);
2166 **local_tail = ref;
2167 *local_tail = &ref->next;
2168 return 0;
2169 }
2170
2171 struct ref *get_local_heads(void)
2172 {
2173 struct ref *local_refs = NULL, **local_tail = &local_refs;
2174
2175 for_each_ref(one_local_ref, &local_tail);
2176 return local_refs;
2177 }
2178
2179 struct ref *guess_remote_head(const struct ref *head,
2180 const struct ref *refs,
2181 int all)
2182 {
2183 const struct ref *r;
2184 struct ref *list = NULL;
2185 struct ref **tail = &list;
2186
2187 if (!head)
2188 return NULL;
2189
2190 /*
2191 * Some transports support directly peeking at
2192 * where HEAD points; if that is the case, then
2193 * we don't have to guess.
2194 */
2195 if (head->symref)
2196 return copy_ref(find_ref_by_name(refs, head->symref));
2197
2198 /* If refs/heads/master could be right, it is. */
2199 if (!all) {
2200 r = find_ref_by_name(refs, "refs/heads/master");
2201 if (r && !oidcmp(&r->old_oid, &head->old_oid))
2202 return copy_ref(r);
2203 }
2204
2205 /* Look for another ref that points there */
2206 for (r = refs; r; r = r->next) {
2207 if (r != head &&
2208 starts_with(r->name, "refs/heads/") &&
2209 !oidcmp(&r->old_oid, &head->old_oid)) {
2210 *tail = copy_ref(r);
2211 tail = &((*tail)->next);
2212 if (!all)
2213 break;
2214 }
2215 }
2216
2217 return list;
2218 }
2219
2220 struct stale_heads_info {
2221 struct string_list *ref_names;
2222 struct ref **stale_refs_tail;
2223 struct refspec *refs;
2224 int ref_count;
2225 };
2226
2227 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2228 int flags, void *cb_data)
2229 {
2230 struct stale_heads_info *info = cb_data;
2231 struct string_list matches = STRING_LIST_INIT_DUP;
2232 struct refspec query;
2233 int i, stale = 1;
2234 memset(&query, 0, sizeof(struct refspec));
2235 query.dst = (char *)refname;
2236
2237 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2238 if (matches.nr == 0)
2239 goto clean_exit; /* No matches */
2240
2241 /*
2242 * If we did find a suitable refspec and it's not a symref and
2243 * it's not in the list of refs that currently exist in that
2244 * remote, we consider it to be stale. In order to deal with
2245 * overlapping refspecs, we need to go over all of the
2246 * matching refs.
2247 */
2248 if (flags & REF_ISSYMREF)
2249 goto clean_exit;
2250
2251 for (i = 0; stale && i < matches.nr; i++)
2252 if (string_list_has_string(info->ref_names, matches.items[i].string))
2253 stale = 0;
2254
2255 if (stale) {
2256 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2257 oidcpy(&ref->new_oid, oid);
2258 }
2259
2260 clean_exit:
2261 string_list_clear(&matches, 0);
2262 return 0;
2263 }
2264
2265 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2266 {
2267 struct ref *ref, *stale_refs = NULL;
2268 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2269 struct stale_heads_info info;
2270
2271 info.ref_names = &ref_names;
2272 info.stale_refs_tail = &stale_refs;
2273 info.refs = refs;
2274 info.ref_count = ref_count;
2275 for (ref = fetch_map; ref; ref = ref->next)
2276 string_list_append(&ref_names, ref->name);
2277 string_list_sort(&ref_names);
2278 for_each_ref(get_stale_heads_cb, &info);
2279 string_list_clear(&ref_names, 0);
2280 return stale_refs;
2281 }
2282
2283 /*
2284 * Compare-and-swap
2285 */
2286 static void clear_cas_option(struct push_cas_option *cas)
2287 {
2288 int i;
2289
2290 for (i = 0; i < cas->nr; i++)
2291 free(cas->entry[i].refname);
2292 free(cas->entry);
2293 memset(cas, 0, sizeof(*cas));
2294 }
2295
2296 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2297 const char *refname,
2298 size_t refnamelen)
2299 {
2300 struct push_cas *entry;
2301 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2302 entry = &cas->entry[cas->nr++];
2303 memset(entry, 0, sizeof(*entry));
2304 entry->refname = xmemdupz(refname, refnamelen);
2305 return entry;
2306 }
2307
2308 static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2309 {
2310 const char *colon;
2311 struct push_cas *entry;
2312
2313 if (unset) {
2314 /* "--no-<option>" */
2315 clear_cas_option(cas);
2316 return 0;
2317 }
2318
2319 if (!arg) {
2320 /* just "--<option>" */
2321 cas->use_tracking_for_rest = 1;
2322 return 0;
2323 }
2324
2325 /* "--<option>=refname" or "--<option>=refname:value" */
2326 colon = strchrnul(arg, ':');
2327 entry = add_cas_entry(cas, arg, colon - arg);
2328 if (!*colon)
2329 entry->use_tracking = 1;
2330 else if (!colon[1])
2331 oidclr(&entry->expect);
2332 else if (get_oid(colon + 1, &entry->expect))
2333 return error("cannot parse expected object name '%s'", colon + 1);
2334 return 0;
2335 }
2336
2337 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2338 {
2339 return parse_push_cas_option(opt->value, arg, unset);
2340 }
2341
2342 int is_empty_cas(const struct push_cas_option *cas)
2343 {
2344 return !cas->use_tracking_for_rest && !cas->nr;
2345 }
2346
2347 /*
2348 * Look at remote.fetch refspec and see if we have a remote
2349 * tracking branch for the refname there. Fill its current
2350 * value in sha1[].
2351 * If we cannot do so, return negative to signal an error.
2352 */
2353 static int remote_tracking(struct remote *remote, const char *refname,
2354 struct object_id *oid)
2355 {
2356 char *dst;
2357
2358 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2359 if (!dst)
2360 return -1; /* no tracking ref for refname at remote */
2361 if (read_ref(dst, oid))
2362 return -1; /* we know what the tracking ref is but we cannot read it */
2363 return 0;
2364 }
2365
2366 static void apply_cas(struct push_cas_option *cas,
2367 struct remote *remote,
2368 struct ref *ref)
2369 {
2370 int i;
2371
2372 /* Find an explicit --<option>=<name>[:<value>] entry */
2373 for (i = 0; i < cas->nr; i++) {
2374 struct push_cas *entry = &cas->entry[i];
2375 if (!refname_match(entry->refname, ref->name))
2376 continue;
2377 ref->expect_old_sha1 = 1;
2378 if (!entry->use_tracking)
2379 oidcpy(&ref->old_oid_expect, &entry->expect);
2380 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2381 oidclr(&ref->old_oid_expect);
2382 return;
2383 }
2384
2385 /* Are we using "--<option>" to cover all? */
2386 if (!cas->use_tracking_for_rest)
2387 return;
2388
2389 ref->expect_old_sha1 = 1;
2390 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2391 oidclr(&ref->old_oid_expect);
2392 }
2393
2394 void apply_push_cas(struct push_cas_option *cas,
2395 struct remote *remote,
2396 struct ref *remote_refs)
2397 {
2398 struct ref *ref;
2399 for (ref = remote_refs; ref; ref = ref->next)
2400 apply_cas(cas, remote, ref);
2401 }
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