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Git 2.16
[git/gitweb.git] / remote.c
blob4e93753e1988afd4a01559951f96142c6dc2e73d
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 const char *remote_ref_for_branch(struct branch *branch, int for_push,
679 int *explicit)
680 {
681 if (branch) {
682 if (!for_push) {
683 if (branch->merge_nr) {
684 if (explicit)
685 *explicit = 1;
686 return branch->merge_name[0];
687 }
688 } else {
689 const char *dst, *remote_name =
690 pushremote_for_branch(branch, NULL);
691 struct remote *remote = remote_get(remote_name);
692
693 if (remote && remote->push_refspec_nr &&
694 (dst = apply_refspecs(remote->push,
695 remote->push_refspec_nr,
696 branch->refname))) {
697 if (explicit)
698 *explicit = 1;
699 return dst;
700 }
701 }
702 }
703 if (explicit)
704 *explicit = 0;
705 return "";
706 }
707
708 static struct remote *remote_get_1(const char *name,
709 const char *(*get_default)(struct branch *, int *))
710 {
711 struct remote *ret;
712 int name_given = 0;
713
714 read_config();
715
716 if (name)
717 name_given = 1;
718 else
719 name = get_default(current_branch, &name_given);
720
721 ret = make_remote(name, 0);
722 if (valid_remote_nick(name) && have_git_dir()) {
723 if (!valid_remote(ret))
724 read_remotes_file(ret);
725 if (!valid_remote(ret))
726 read_branches_file(ret);
727 }
728 if (name_given && !valid_remote(ret))
729 add_url_alias(ret, name);
730 if (!valid_remote(ret))
731 return NULL;
732 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
733 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
734 return ret;
735 }
736
737 struct remote *remote_get(const char *name)
738 {
739 return remote_get_1(name, remote_for_branch);
740 }
741
742 struct remote *pushremote_get(const char *name)
743 {
744 return remote_get_1(name, pushremote_for_branch);
745 }
746
747 int remote_is_configured(struct remote *remote, int in_repo)
748 {
749 if (!remote)
750 return 0;
751 if (in_repo)
752 return remote->configured_in_repo;
753 return !!remote->origin;
754 }
755
756 int for_each_remote(each_remote_fn fn, void *priv)
757 {
758 int i, result = 0;
759 read_config();
760 for (i = 0; i < remotes_nr && !result; i++) {
761 struct remote *r = remotes[i];
762 if (!r)
763 continue;
764 if (!r->fetch)
765 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
766 r->fetch_refspec);
767 if (!r->push)
768 r->push = parse_push_refspec(r->push_refspec_nr,
769 r->push_refspec);
770 result = fn(r, priv);
771 }
772 return result;
773 }
774
775 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
776 {
777 if (strcmp(ref1->name, ref2->name)) {
778 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
779 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
780 die(_("Cannot fetch both %s and %s to %s"),
781 ref1->name, ref2->name, ref2->peer_ref->name);
782 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
783 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
784 warning(_("%s usually tracks %s, not %s"),
785 ref2->peer_ref->name, ref2->name, ref1->name);
786 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
787 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
788 die(_("%s tracks both %s and %s"),
789 ref2->peer_ref->name, ref1->name, ref2->name);
790 } else {
791 /*
792 * This last possibility doesn't occur because
793 * FETCH_HEAD_IGNORE entries always appear at
794 * the end of the list.
795 */
796 die(_("Internal error"));
797 }
798 }
799 free(ref2->peer_ref);
800 free(ref2);
801 }
802
803 struct ref *ref_remove_duplicates(struct ref *ref_map)
804 {
805 struct string_list refs = STRING_LIST_INIT_NODUP;
806 struct ref *retval = NULL;
807 struct ref **p = &retval;
808
809 while (ref_map) {
810 struct ref *ref = ref_map;
811
812 ref_map = ref_map->next;
813 ref->next = NULL;
814
815 if (!ref->peer_ref) {
816 *p = ref;
817 p = &ref->next;
818 } else {
819 struct string_list_item *item =
820 string_list_insert(&refs, ref->peer_ref->name);
821
822 if (item->util) {
823 /* Entry already existed */
824 handle_duplicate((struct ref *)item->util, ref);
825 } else {
826 *p = ref;
827 p = &ref->next;
828 item->util = ref;
829 }
830 }
831 }
832
833 string_list_clear(&refs, 0);
834 return retval;
835 }
836
837 int remote_has_url(struct remote *remote, const char *url)
838 {
839 int i;
840 for (i = 0; i < remote->url_nr; i++) {
841 if (!strcmp(remote->url[i], url))
842 return 1;
843 }
844 return 0;
845 }
846
847 static int match_name_with_pattern(const char *key, const char *name,
848 const char *value, char **result)
849 {
850 const char *kstar = strchr(key, '*');
851 size_t klen;
852 size_t ksuffixlen;
853 size_t namelen;
854 int ret;
855 if (!kstar)
856 die("Key '%s' of pattern had no '*'", key);
857 klen = kstar - key;
858 ksuffixlen = strlen(kstar + 1);
859 namelen = strlen(name);
860 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
861 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
862 if (ret && value) {
863 struct strbuf sb = STRBUF_INIT;
864 const char *vstar = strchr(value, '*');
865 if (!vstar)
866 die("Value '%s' of pattern has no '*'", value);
867 strbuf_add(&sb, value, vstar - value);
868 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
869 strbuf_addstr(&sb, vstar + 1);
870 *result = strbuf_detach(&sb, NULL);
871 }
872 return ret;
873 }
874
875 static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
876 {
877 int i;
878 int find_src = !query->src;
879
880 if (find_src && !query->dst)
881 error("query_refspecs_multiple: need either src or dst");
882
883 for (i = 0; i < ref_count; i++) {
884 struct refspec *refspec = &refs[i];
885 const char *key = find_src ? refspec->dst : refspec->src;
886 const char *value = find_src ? refspec->src : refspec->dst;
887 const char *needle = find_src ? query->dst : query->src;
888 char **result = find_src ? &query->src : &query->dst;
889
890 if (!refspec->dst)
891 continue;
892 if (refspec->pattern) {
893 if (match_name_with_pattern(key, needle, value, result))
894 string_list_append_nodup(results, *result);
895 } else if (!strcmp(needle, key)) {
896 string_list_append(results, value);
897 }
898 }
899 }
900
901 int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
902 {
903 int i;
904 int find_src = !query->src;
905 const char *needle = find_src ? query->dst : query->src;
906 char **result = find_src ? &query->src : &query->dst;
907
908 if (find_src && !query->dst)
909 return error("query_refspecs: need either src or dst");
910
911 for (i = 0; i < ref_count; i++) {
912 struct refspec *refspec = &refs[i];
913 const char *key = find_src ? refspec->dst : refspec->src;
914 const char *value = find_src ? refspec->src : refspec->dst;
915
916 if (!refspec->dst)
917 continue;
918 if (refspec->pattern) {
919 if (match_name_with_pattern(key, needle, value, result)) {
920 query->force = refspec->force;
921 return 0;
922 }
923 } else if (!strcmp(needle, key)) {
924 *result = xstrdup(value);
925 query->force = refspec->force;
926 return 0;
927 }
928 }
929 return -1;
930 }
931
932 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
933 const char *name)
934 {
935 struct refspec query;
936
937 memset(&query, 0, sizeof(struct refspec));
938 query.src = (char *)name;
939
940 if (query_refspecs(refspecs, nr_refspec, &query))
941 return NULL;
942
943 return query.dst;
944 }
945
946 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
947 {
948 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
949 }
950
951 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
952 const char *name)
953 {
954 size_t len = strlen(name);
955 struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
956 memcpy(ref->name, prefix, prefixlen);
957 memcpy(ref->name + prefixlen, name, len);
958 return ref;
959 }
960
961 struct ref *alloc_ref(const char *name)
962 {
963 return alloc_ref_with_prefix("", 0, name);
964 }
965
966 struct ref *copy_ref(const struct ref *ref)
967 {
968 struct ref *cpy;
969 size_t len;
970 if (!ref)
971 return NULL;
972 len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
973 cpy = xmalloc(len);
974 memcpy(cpy, ref, len);
975 cpy->next = NULL;
976 cpy->symref = xstrdup_or_null(ref->symref);
977 cpy->remote_status = xstrdup_or_null(ref->remote_status);
978 cpy->peer_ref = copy_ref(ref->peer_ref);
979 return cpy;
980 }
981
982 struct ref *copy_ref_list(const struct ref *ref)
983 {
984 struct ref *ret = NULL;
985 struct ref **tail = &ret;
986 while (ref) {
987 *tail = copy_ref(ref);
988 ref = ref->next;
989 tail = &((*tail)->next);
990 }
991 return ret;
992 }
993
994 static void free_ref(struct ref *ref)
995 {
996 if (!ref)
997 return;
998 free_ref(ref->peer_ref);
999 free(ref->remote_status);
1000 free(ref->symref);
1001 free(ref);
1002 }
1003
1004 void free_refs(struct ref *ref)
1005 {
1006 struct ref *next;
1007 while (ref) {
1008 next = ref->next;
1009 free_ref(ref);
1010 ref = next;
1011 }
1012 }
1013
1014 int ref_compare_name(const void *va, const void *vb)
1015 {
1016 const struct ref *a = va, *b = vb;
1017 return strcmp(a->name, b->name);
1018 }
1019
1020 static void *ref_list_get_next(const void *a)
1021 {
1022 return ((const struct ref *)a)->next;
1023 }
1024
1025 static void ref_list_set_next(void *a, void *next)
1026 {
1027 ((struct ref *)a)->next = next;
1028 }
1029
1030 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1031 {
1032 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1033 }
1034
1035 int count_refspec_match(const char *pattern,
1036 struct ref *refs,
1037 struct ref **matched_ref)
1038 {
1039 int patlen = strlen(pattern);
1040 struct ref *matched_weak = NULL;
1041 struct ref *matched = NULL;
1042 int weak_match = 0;
1043 int match = 0;
1044
1045 for (weak_match = match = 0; refs; refs = refs->next) {
1046 char *name = refs->name;
1047 int namelen = strlen(name);
1048
1049 if (!refname_match(pattern, name))
1050 continue;
1051
1052 /* A match is "weak" if it is with refs outside
1053 * heads or tags, and did not specify the pattern
1054 * in full (e.g. "refs/remotes/origin/master") or at
1055 * least from the toplevel (e.g. "remotes/origin/master");
1056 * otherwise "git push $URL master" would result in
1057 * ambiguity between remotes/origin/master and heads/master
1058 * at the remote site.
1059 */
1060 if (namelen != patlen &&
1061 patlen != namelen - 5 &&
1062 !starts_with(name, "refs/heads/") &&
1063 !starts_with(name, "refs/tags/")) {
1064 /* We want to catch the case where only weak
1065 * matches are found and there are multiple
1066 * matches, and where more than one strong
1067 * matches are found, as ambiguous. One
1068 * strong match with zero or more weak matches
1069 * are acceptable as a unique match.
1070 */
1071 matched_weak = refs;
1072 weak_match++;
1073 }
1074 else {
1075 matched = refs;
1076 match++;
1077 }
1078 }
1079 if (!matched) {
1080 if (matched_ref)
1081 *matched_ref = matched_weak;
1082 return weak_match;
1083 }
1084 else {
1085 if (matched_ref)
1086 *matched_ref = matched;
1087 return match;
1088 }
1089 }
1090
1091 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1092 {
1093 **tail = ref;
1094 while (ref->next)
1095 ref = ref->next;
1096 *tail = &ref->next;
1097 }
1098
1099 static struct ref *alloc_delete_ref(void)
1100 {
1101 struct ref *ref = alloc_ref("(delete)");
1102 oidclr(&ref->new_oid);
1103 return ref;
1104 }
1105
1106 static int try_explicit_object_name(const char *name,
1107 struct ref **match)
1108 {
1109 struct object_id oid;
1110
1111 if (!*name) {
1112 if (match)
1113 *match = alloc_delete_ref();
1114 return 0;
1115 }
1116
1117 if (get_oid(name, &oid))
1118 return -1;
1119
1120 if (match) {
1121 *match = alloc_ref(name);
1122 oidcpy(&(*match)->new_oid, &oid);
1123 }
1124 return 0;
1125 }
1126
1127 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1128 {
1129 struct ref *ret = alloc_ref(name);
1130 tail_link_ref(ret, tail);
1131 return ret;
1132 }
1133
1134 static char *guess_ref(const char *name, struct ref *peer)
1135 {
1136 struct strbuf buf = STRBUF_INIT;
1137
1138 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1139 NULL, NULL);
1140 if (!r)
1141 return NULL;
1142
1143 if (starts_with(r, "refs/heads/"))
1144 strbuf_addstr(&buf, "refs/heads/");
1145 else if (starts_with(r, "refs/tags/"))
1146 strbuf_addstr(&buf, "refs/tags/");
1147 else
1148 return NULL;
1149
1150 strbuf_addstr(&buf, name);
1151 return strbuf_detach(&buf, NULL);
1152 }
1153
1154 static int match_explicit_lhs(struct ref *src,
1155 struct refspec *rs,
1156 struct ref **match,
1157 int *allocated_match)
1158 {
1159 switch (count_refspec_match(rs->src, src, match)) {
1160 case 1:
1161 if (allocated_match)
1162 *allocated_match = 0;
1163 return 0;
1164 case 0:
1165 /* The source could be in the get_sha1() format
1166 * not a reference name. :refs/other is a
1167 * way to delete 'other' ref at the remote end.
1168 */
1169 if (try_explicit_object_name(rs->src, match) < 0)
1170 return error("src refspec %s does not match any.", rs->src);
1171 if (allocated_match)
1172 *allocated_match = 1;
1173 return 0;
1174 default:
1175 return error("src refspec %s matches more than one.", rs->src);
1176 }
1177 }
1178
1179 static int match_explicit(struct ref *src, struct ref *dst,
1180 struct ref ***dst_tail,
1181 struct refspec *rs)
1182 {
1183 struct ref *matched_src, *matched_dst;
1184 int allocated_src;
1185
1186 const char *dst_value = rs->dst;
1187 char *dst_guess;
1188
1189 if (rs->pattern || rs->matching)
1190 return 0;
1191
1192 matched_src = matched_dst = NULL;
1193 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1194 return -1;
1195
1196 if (!dst_value) {
1197 int flag;
1198
1199 dst_value = resolve_ref_unsafe(matched_src->name,
1200 RESOLVE_REF_READING,
1201 NULL, &flag);
1202 if (!dst_value ||
1203 ((flag & REF_ISSYMREF) &&
1204 !starts_with(dst_value, "refs/heads/")))
1205 die("%s cannot be resolved to branch.",
1206 matched_src->name);
1207 }
1208
1209 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1210 case 1:
1211 break;
1212 case 0:
1213 if (starts_with(dst_value, "refs/"))
1214 matched_dst = make_linked_ref(dst_value, dst_tail);
1215 else if (is_null_oid(&matched_src->new_oid))
1216 error("unable to delete '%s': remote ref does not exist",
1217 dst_value);
1218 else if ((dst_guess = guess_ref(dst_value, matched_src))) {
1219 matched_dst = make_linked_ref(dst_guess, dst_tail);
1220 free(dst_guess);
1221 } else
1222 error("unable to push to unqualified destination: %s\n"
1223 "The destination refspec neither matches an "
1224 "existing ref on the remote nor\n"
1225 "begins with refs/, and we are unable to "
1226 "guess a prefix based on the source ref.",
1227 dst_value);
1228 break;
1229 default:
1230 matched_dst = NULL;
1231 error("dst refspec %s matches more than one.",
1232 dst_value);
1233 break;
1234 }
1235 if (!matched_dst)
1236 return -1;
1237 if (matched_dst->peer_ref)
1238 return error("dst ref %s receives from more than one src.",
1239 matched_dst->name);
1240 else {
1241 matched_dst->peer_ref = allocated_src ?
1242 matched_src :
1243 copy_ref(matched_src);
1244 matched_dst->force = rs->force;
1245 }
1246 return 0;
1247 }
1248
1249 static int match_explicit_refs(struct ref *src, struct ref *dst,
1250 struct ref ***dst_tail, struct refspec *rs,
1251 int rs_nr)
1252 {
1253 int i, errs;
1254 for (i = errs = 0; i < rs_nr; i++)
1255 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1256 return errs;
1257 }
1258
1259 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1260 int send_mirror, int direction, const struct refspec **ret_pat)
1261 {
1262 const struct refspec *pat;
1263 char *name;
1264 int i;
1265 int matching_refs = -1;
1266 for (i = 0; i < rs_nr; i++) {
1267 if (rs[i].matching &&
1268 (matching_refs == -1 || rs[i].force)) {
1269 matching_refs = i;
1270 continue;
1271 }
1272
1273 if (rs[i].pattern) {
1274 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1275 int match;
1276 if (direction == FROM_SRC)
1277 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1278 else
1279 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1280 if (match) {
1281 matching_refs = i;
1282 break;
1283 }
1284 }
1285 }
1286 if (matching_refs == -1)
1287 return NULL;
1288
1289 pat = rs + matching_refs;
1290 if (pat->matching) {
1291 /*
1292 * "matching refs"; traditionally we pushed everything
1293 * including refs outside refs/heads/ hierarchy, but
1294 * that does not make much sense these days.
1295 */
1296 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1297 return NULL;
1298 name = xstrdup(ref->name);
1299 }
1300 if (ret_pat)
1301 *ret_pat = pat;
1302 return name;
1303 }
1304
1305 static struct ref **tail_ref(struct ref **head)
1306 {
1307 struct ref **tail = head;
1308 while (*tail)
1309 tail = &((*tail)->next);
1310 return tail;
1311 }
1312
1313 struct tips {
1314 struct commit **tip;
1315 int nr, alloc;
1316 };
1317
1318 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1319 {
1320 struct commit *commit;
1321
1322 if (is_null_oid(oid))
1323 return;
1324 commit = lookup_commit_reference_gently(oid, 1);
1325 if (!commit || (commit->object.flags & TMP_MARK))
1326 return;
1327 commit->object.flags |= TMP_MARK;
1328 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1329 tips->tip[tips->nr++] = commit;
1330 }
1331
1332 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1333 {
1334 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1335 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1336 struct string_list_item *item;
1337 struct ref *ref;
1338 struct tips sent_tips;
1339
1340 /*
1341 * Collect everything we know they would have at the end of
1342 * this push, and collect all tags they have.
1343 */
1344 memset(&sent_tips, 0, sizeof(sent_tips));
1345 for (ref = *dst; ref; ref = ref->next) {
1346 if (ref->peer_ref &&
1347 !is_null_oid(&ref->peer_ref->new_oid))
1348 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1349 else
1350 add_to_tips(&sent_tips, &ref->old_oid);
1351 if (starts_with(ref->name, "refs/tags/"))
1352 string_list_append(&dst_tag, ref->name);
1353 }
1354 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1355
1356 string_list_sort(&dst_tag);
1357
1358 /* Collect tags they do not have. */
1359 for (ref = src; ref; ref = ref->next) {
1360 if (!starts_with(ref->name, "refs/tags/"))
1361 continue; /* not a tag */
1362 if (string_list_has_string(&dst_tag, ref->name))
1363 continue; /* they already have it */
1364 if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
1365 continue; /* be conservative */
1366 item = string_list_append(&src_tag, ref->name);
1367 item->util = ref;
1368 }
1369 string_list_clear(&dst_tag, 0);
1370
1371 /*
1372 * At this point, src_tag lists tags that are missing from
1373 * dst, and sent_tips lists the tips we are pushing or those
1374 * that we know they already have. An element in the src_tag
1375 * that is an ancestor of any of the sent_tips needs to be
1376 * sent to the other side.
1377 */
1378 if (sent_tips.nr) {
1379 for_each_string_list_item(item, &src_tag) {
1380 struct ref *ref = item->util;
1381 struct ref *dst_ref;
1382 struct commit *commit;
1383
1384 if (is_null_oid(&ref->new_oid))
1385 continue;
1386 commit = lookup_commit_reference_gently(&ref->new_oid,
1387 1);
1388 if (!commit)
1389 /* not pushing a commit, which is not an error */
1390 continue;
1391
1392 /*
1393 * Is this tag, which they do not have, reachable from
1394 * any of the commits we are sending?
1395 */
1396 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1397 continue;
1398
1399 /* Add it in */
1400 dst_ref = make_linked_ref(ref->name, dst_tail);
1401 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1402 dst_ref->peer_ref = copy_ref(ref);
1403 }
1404 }
1405 string_list_clear(&src_tag, 0);
1406 free(sent_tips.tip);
1407 }
1408
1409 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1410 {
1411 for ( ; list; list = list->next)
1412 if (!strcmp(list->name, name))
1413 return (struct ref *)list;
1414 return NULL;
1415 }
1416
1417 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1418 {
1419 for ( ; ref; ref = ref->next)
1420 string_list_append_nodup(ref_index, ref->name)->util = ref;
1421
1422 string_list_sort(ref_index);
1423 }
1424
1425 /*
1426 * Given only the set of local refs, sanity-check the set of push
1427 * refspecs. We can't catch all errors that match_push_refs would,
1428 * but we can catch some errors early before even talking to the
1429 * remote side.
1430 */
1431 int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1432 {
1433 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1434 int ret = 0;
1435 int i;
1436
1437 for (i = 0; i < nr_refspec; i++) {
1438 struct refspec *rs = refspec + i;
1439
1440 if (rs->pattern || rs->matching)
1441 continue;
1442
1443 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1444 }
1445
1446 free_refspec(nr_refspec, refspec);
1447 return ret;
1448 }
1449
1450 /*
1451 * Given the set of refs the local repository has, the set of refs the
1452 * remote repository has, and the refspec used for push, determine
1453 * what remote refs we will update and with what value by setting
1454 * peer_ref (which object is being pushed) and force (if the push is
1455 * forced) in elements of "dst". The function may add new elements to
1456 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1457 */
1458 int match_push_refs(struct ref *src, struct ref **dst,
1459 int nr_refspec, const char **refspec, int flags)
1460 {
1461 struct refspec *rs;
1462 int send_all = flags & MATCH_REFS_ALL;
1463 int send_mirror = flags & MATCH_REFS_MIRROR;
1464 int send_prune = flags & MATCH_REFS_PRUNE;
1465 int errs;
1466 static const char *default_refspec[] = { ":", NULL };
1467 struct ref *ref, **dst_tail = tail_ref(dst);
1468 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1469
1470 if (!nr_refspec) {
1471 nr_refspec = 1;
1472 refspec = default_refspec;
1473 }
1474 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1475 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1476
1477 /* pick the remainder */
1478 for (ref = src; ref; ref = ref->next) {
1479 struct string_list_item *dst_item;
1480 struct ref *dst_peer;
1481 const struct refspec *pat = NULL;
1482 char *dst_name;
1483
1484 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1485 if (!dst_name)
1486 continue;
1487
1488 if (!dst_ref_index.nr)
1489 prepare_ref_index(&dst_ref_index, *dst);
1490
1491 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1492 dst_peer = dst_item ? dst_item->util : NULL;
1493 if (dst_peer) {
1494 if (dst_peer->peer_ref)
1495 /* We're already sending something to this ref. */
1496 goto free_name;
1497 } else {
1498 if (pat->matching && !(send_all || send_mirror))
1499 /*
1500 * Remote doesn't have it, and we have no
1501 * explicit pattern, and we don't have
1502 * --all or --mirror.
1503 */
1504 goto free_name;
1505
1506 /* Create a new one and link it */
1507 dst_peer = make_linked_ref(dst_name, &dst_tail);
1508 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1509 string_list_insert(&dst_ref_index,
1510 dst_peer->name)->util = dst_peer;
1511 }
1512 dst_peer->peer_ref = copy_ref(ref);
1513 dst_peer->force = pat->force;
1514 free_name:
1515 free(dst_name);
1516 }
1517
1518 string_list_clear(&dst_ref_index, 0);
1519
1520 if (flags & MATCH_REFS_FOLLOW_TAGS)
1521 add_missing_tags(src, dst, &dst_tail);
1522
1523 if (send_prune) {
1524 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1525 /* check for missing refs on the remote */
1526 for (ref = *dst; ref; ref = ref->next) {
1527 char *src_name;
1528
1529 if (ref->peer_ref)
1530 /* We're already sending something to this ref. */
1531 continue;
1532
1533 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1534 if (src_name) {
1535 if (!src_ref_index.nr)
1536 prepare_ref_index(&src_ref_index, src);
1537 if (!string_list_has_string(&src_ref_index,
1538 src_name))
1539 ref->peer_ref = alloc_delete_ref();
1540 free(src_name);
1541 }
1542 }
1543 string_list_clear(&src_ref_index, 0);
1544 }
1545 if (errs)
1546 return -1;
1547 return 0;
1548 }
1549
1550 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1551 int force_update)
1552 {
1553 struct ref *ref;
1554
1555 for (ref = remote_refs; ref; ref = ref->next) {
1556 int force_ref_update = ref->force || force_update;
1557 int reject_reason = 0;
1558
1559 if (ref->peer_ref)
1560 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1561 else if (!send_mirror)
1562 continue;
1563
1564 ref->deletion = is_null_oid(&ref->new_oid);
1565 if (!ref->deletion &&
1566 !oidcmp(&ref->old_oid, &ref->new_oid)) {
1567 ref->status = REF_STATUS_UPTODATE;
1568 continue;
1569 }
1570
1571 /*
1572 * If the remote ref has moved and is now different
1573 * from what we expect, reject any push.
1574 *
1575 * It also is an error if the user told us to check
1576 * with the remote-tracking branch to find the value
1577 * to expect, but we did not have such a tracking
1578 * branch.
1579 */
1580 if (ref->expect_old_sha1) {
1581 if (oidcmp(&ref->old_oid, &ref->old_oid_expect))
1582 reject_reason = REF_STATUS_REJECT_STALE;
1583 else
1584 /* If the ref isn't stale then force the update. */
1585 force_ref_update = 1;
1586 }
1587
1588 /*
1589 * If the update isn't already rejected then check
1590 * the usual "must fast-forward" rules.
1591 *
1592 * Decide whether an individual refspec A:B can be
1593 * pushed. The push will succeed if any of the
1594 * following are true:
1595 *
1596 * (1) the remote reference B does not exist
1597 *
1598 * (2) the remote reference B is being removed (i.e.,
1599 * pushing :B where no source is specified)
1600 *
1601 * (3) the destination is not under refs/tags/, and
1602 * if the old and new value is a commit, the new
1603 * is a descendant of the old.
1604 *
1605 * (4) it is forced using the +A:B notation, or by
1606 * passing the --force argument
1607 */
1608
1609 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1610 if (starts_with(ref->name, "refs/tags/"))
1611 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1612 else if (!has_object_file(&ref->old_oid))
1613 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1614 else if (!lookup_commit_reference_gently(&ref->old_oid, 1) ||
1615 !lookup_commit_reference_gently(&ref->new_oid, 1))
1616 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1617 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1618 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1619 }
1620
1621 /*
1622 * "--force" will defeat any rejection implemented
1623 * by the rules above.
1624 */
1625 if (!force_ref_update)
1626 ref->status = reject_reason;
1627 else if (reject_reason)
1628 ref->forced_update = 1;
1629 }
1630 }
1631
1632 static void set_merge(struct branch *ret)
1633 {
1634 struct remote *remote;
1635 char *ref;
1636 struct object_id oid;
1637 int i;
1638
1639 if (!ret)
1640 return; /* no branch */
1641 if (ret->merge)
1642 return; /* already run */
1643 if (!ret->remote_name || !ret->merge_nr) {
1644 /*
1645 * no merge config; let's make sure we don't confuse callers
1646 * with a non-zero merge_nr but a NULL merge
1647 */
1648 ret->merge_nr = 0;
1649 return;
1650 }
1651
1652 remote = remote_get(ret->remote_name);
1653
1654 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1655 for (i = 0; i < ret->merge_nr; i++) {
1656 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1657 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1658 if (!remote_find_tracking(remote, ret->merge[i]) ||
1659 strcmp(ret->remote_name, "."))
1660 continue;
1661 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1662 &oid, &ref) == 1)
1663 ret->merge[i]->dst = ref;
1664 else
1665 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1666 }
1667 }
1668
1669 struct branch *branch_get(const char *name)
1670 {
1671 struct branch *ret;
1672
1673 read_config();
1674 if (!name || !*name || !strcmp(name, "HEAD"))
1675 ret = current_branch;
1676 else
1677 ret = make_branch(name, 0);
1678 set_merge(ret);
1679 return ret;
1680 }
1681
1682 int branch_has_merge_config(struct branch *branch)
1683 {
1684 return branch && !!branch->merge;
1685 }
1686
1687 int branch_merge_matches(struct branch *branch,
1688 int i,
1689 const char *refname)
1690 {
1691 if (!branch || i < 0 || i >= branch->merge_nr)
1692 return 0;
1693 return refname_match(branch->merge[i]->src, refname);
1694 }
1695
1696 __attribute__((format (printf,2,3)))
1697 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1698 {
1699 if (err) {
1700 va_list ap;
1701 va_start(ap, fmt);
1702 strbuf_vaddf(err, fmt, ap);
1703 va_end(ap);
1704 }
1705 return NULL;
1706 }
1707
1708 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1709 {
1710 if (!branch)
1711 return error_buf(err, _("HEAD does not point to a branch"));
1712
1713 if (!branch->merge || !branch->merge[0]) {
1714 /*
1715 * no merge config; is it because the user didn't define any,
1716 * or because it is not a real branch, and get_branch
1717 * auto-vivified it?
1718 */
1719 if (!ref_exists(branch->refname))
1720 return error_buf(err, _("no such branch: '%s'"),
1721 branch->name);
1722 return error_buf(err,
1723 _("no upstream configured for branch '%s'"),
1724 branch->name);
1725 }
1726
1727 if (!branch->merge[0]->dst)
1728 return error_buf(err,
1729 _("upstream branch '%s' not stored as a remote-tracking branch"),
1730 branch->merge[0]->src);
1731
1732 return branch->merge[0]->dst;
1733 }
1734
1735 static const char *tracking_for_push_dest(struct remote *remote,
1736 const char *refname,
1737 struct strbuf *err)
1738 {
1739 char *ret;
1740
1741 ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1742 if (!ret)
1743 return error_buf(err,
1744 _("push destination '%s' on remote '%s' has no local tracking branch"),
1745 refname, remote->name);
1746 return ret;
1747 }
1748
1749 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1750 {
1751 struct remote *remote;
1752
1753 remote = remote_get(pushremote_for_branch(branch, NULL));
1754 if (!remote)
1755 return error_buf(err,
1756 _("branch '%s' has no remote for pushing"),
1757 branch->name);
1758
1759 if (remote->push_refspec_nr) {
1760 char *dst;
1761 const char *ret;
1762
1763 dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1764 branch->refname);
1765 if (!dst)
1766 return error_buf(err,
1767 _("push refspecs for '%s' do not include '%s'"),
1768 remote->name, branch->name);
1769
1770 ret = tracking_for_push_dest(remote, dst, err);
1771 free(dst);
1772 return ret;
1773 }
1774
1775 if (remote->mirror)
1776 return tracking_for_push_dest(remote, branch->refname, err);
1777
1778 switch (push_default) {
1779 case PUSH_DEFAULT_NOTHING:
1780 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1781
1782 case PUSH_DEFAULT_MATCHING:
1783 case PUSH_DEFAULT_CURRENT:
1784 return tracking_for_push_dest(remote, branch->refname, err);
1785
1786 case PUSH_DEFAULT_UPSTREAM:
1787 return branch_get_upstream(branch, err);
1788
1789 case PUSH_DEFAULT_UNSPECIFIED:
1790 case PUSH_DEFAULT_SIMPLE:
1791 {
1792 const char *up, *cur;
1793
1794 up = branch_get_upstream(branch, err);
1795 if (!up)
1796 return NULL;
1797 cur = tracking_for_push_dest(remote, branch->refname, err);
1798 if (!cur)
1799 return NULL;
1800 if (strcmp(cur, up))
1801 return error_buf(err,
1802 _("cannot resolve 'simple' push to a single destination"));
1803 return cur;
1804 }
1805 }
1806
1807 die("BUG: unhandled push situation");
1808 }
1809
1810 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1811 {
1812 if (!branch)
1813 return error_buf(err, _("HEAD does not point to a branch"));
1814
1815 if (!branch->push_tracking_ref)
1816 branch->push_tracking_ref = branch_get_push_1(branch, err);
1817 return branch->push_tracking_ref;
1818 }
1819
1820 static int ignore_symref_update(const char *refname)
1821 {
1822 int flag;
1823
1824 if (!resolve_ref_unsafe(refname, 0, NULL, &flag))
1825 return 0; /* non-existing refs are OK */
1826 return (flag & REF_ISSYMREF);
1827 }
1828
1829 /*
1830 * Create and return a list of (struct ref) consisting of copies of
1831 * each remote_ref that matches refspec. refspec must be a pattern.
1832 * Fill in the copies' peer_ref to describe the local tracking refs to
1833 * which they map. Omit any references that would map to an existing
1834 * local symbolic ref.
1835 */
1836 static struct ref *get_expanded_map(const struct ref *remote_refs,
1837 const struct refspec *refspec)
1838 {
1839 const struct ref *ref;
1840 struct ref *ret = NULL;
1841 struct ref **tail = &ret;
1842
1843 for (ref = remote_refs; ref; ref = ref->next) {
1844 char *expn_name = NULL;
1845
1846 if (strchr(ref->name, '^'))
1847 continue; /* a dereference item */
1848 if (match_name_with_pattern(refspec->src, ref->name,
1849 refspec->dst, &expn_name) &&
1850 !ignore_symref_update(expn_name)) {
1851 struct ref *cpy = copy_ref(ref);
1852
1853 cpy->peer_ref = alloc_ref(expn_name);
1854 if (refspec->force)
1855 cpy->peer_ref->force = 1;
1856 *tail = cpy;
1857 tail = &cpy->next;
1858 }
1859 free(expn_name);
1860 }
1861
1862 return ret;
1863 }
1864
1865 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1866 {
1867 const struct ref *ref;
1868 for (ref = refs; ref; ref = ref->next) {
1869 if (refname_match(name, ref->name))
1870 return ref;
1871 }
1872 return NULL;
1873 }
1874
1875 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1876 {
1877 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1878
1879 if (!ref)
1880 return NULL;
1881
1882 return copy_ref(ref);
1883 }
1884
1885 static struct ref *get_local_ref(const char *name)
1886 {
1887 if (!name || name[0] == '\0')
1888 return NULL;
1889
1890 if (starts_with(name, "refs/"))
1891 return alloc_ref(name);
1892
1893 if (starts_with(name, "heads/") ||
1894 starts_with(name, "tags/") ||
1895 starts_with(name, "remotes/"))
1896 return alloc_ref_with_prefix("refs/", 5, name);
1897
1898 return alloc_ref_with_prefix("refs/heads/", 11, name);
1899 }
1900
1901 int get_fetch_map(const struct ref *remote_refs,
1902 const struct refspec *refspec,
1903 struct ref ***tail,
1904 int missing_ok)
1905 {
1906 struct ref *ref_map, **rmp;
1907
1908 if (refspec->pattern) {
1909 ref_map = get_expanded_map(remote_refs, refspec);
1910 } else {
1911 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1912
1913 if (refspec->exact_sha1) {
1914 ref_map = alloc_ref(name);
1915 get_oid_hex(name, &ref_map->old_oid);
1916 } else {
1917 ref_map = get_remote_ref(remote_refs, name);
1918 }
1919 if (!missing_ok && !ref_map)
1920 die("Couldn't find remote ref %s", name);
1921 if (ref_map) {
1922 ref_map->peer_ref = get_local_ref(refspec->dst);
1923 if (ref_map->peer_ref && refspec->force)
1924 ref_map->peer_ref->force = 1;
1925 }
1926 }
1927
1928 for (rmp = &ref_map; *rmp; ) {
1929 if ((*rmp)->peer_ref) {
1930 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1931 check_refname_format((*rmp)->peer_ref->name, 0)) {
1932 struct ref *ignore = *rmp;
1933 error("* Ignoring funny ref '%s' locally",
1934 (*rmp)->peer_ref->name);
1935 *rmp = (*rmp)->next;
1936 free(ignore->peer_ref);
1937 free(ignore);
1938 continue;
1939 }
1940 }
1941 rmp = &((*rmp)->next);
1942 }
1943
1944 if (ref_map)
1945 tail_link_ref(ref_map, tail);
1946
1947 return 0;
1948 }
1949
1950 int resolve_remote_symref(struct ref *ref, struct ref *list)
1951 {
1952 if (!ref->symref)
1953 return 0;
1954 for (; list; list = list->next)
1955 if (!strcmp(ref->symref, list->name)) {
1956 oidcpy(&ref->old_oid, &list->old_oid);
1957 return 0;
1958 }
1959 return 1;
1960 }
1961
1962 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1963 {
1964 while (list) {
1965 struct commit *commit = pop_commit(&list);
1966 commit->object.flags &= ~mark;
1967 }
1968 }
1969
1970 int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
1971 {
1972 struct object *o;
1973 struct commit *old, *new;
1974 struct commit_list *list, *used;
1975 int found = 0;
1976
1977 /*
1978 * Both new and old must be commit-ish and new is descendant of
1979 * old. Otherwise we require --force.
1980 */
1981 o = deref_tag(parse_object(old_oid), NULL, 0);
1982 if (!o || o->type != OBJ_COMMIT)
1983 return 0;
1984 old = (struct commit *) o;
1985
1986 o = deref_tag(parse_object(new_oid), NULL, 0);
1987 if (!o || o->type != OBJ_COMMIT)
1988 return 0;
1989 new = (struct commit *) o;
1990
1991 if (parse_commit(new) < 0)
1992 return 0;
1993
1994 used = list = NULL;
1995 commit_list_insert(new, &list);
1996 while (list) {
1997 new = pop_most_recent_commit(&list, TMP_MARK);
1998 commit_list_insert(new, &used);
1999 if (new == old) {
2000 found = 1;
2001 break;
2002 }
2003 }
2004 unmark_and_free(list, TMP_MARK);
2005 unmark_and_free(used, TMP_MARK);
2006 return found;
2007 }
2008
2009 /*
2010 * Compare a branch with its upstream, and save their differences (number
2011 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
2012 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
2013 * is not itself NULL.
2014 *
2015 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
2016 * upstream defined, or ref does not exist), 0 otherwise.
2017 */
2018 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
2019 const char **upstream_name)
2020 {
2021 struct object_id oid;
2022 struct commit *ours, *theirs;
2023 struct rev_info revs;
2024 const char *base;
2025 struct argv_array argv = ARGV_ARRAY_INIT;
2026
2027 /* Cannot stat unless we are marked to build on top of somebody else. */
2028 base = branch_get_upstream(branch, NULL);
2029 if (upstream_name)
2030 *upstream_name = base;
2031 if (!base)
2032 return -1;
2033
2034 /* Cannot stat if what we used to build on no longer exists */
2035 if (read_ref(base, &oid))
2036 return -1;
2037 theirs = lookup_commit_reference(&oid);
2038 if (!theirs)
2039 return -1;
2040
2041 if (read_ref(branch->refname, &oid))
2042 return -1;
2043 ours = lookup_commit_reference(&oid);
2044 if (!ours)
2045 return -1;
2046
2047 /* are we the same? */
2048 if (theirs == ours) {
2049 *num_theirs = *num_ours = 0;
2050 return 0;
2051 }
2052
2053 /* Run "rev-list --left-right ours...theirs" internally... */
2054 argv_array_push(&argv, ""); /* ignored */
2055 argv_array_push(&argv, "--left-right");
2056 argv_array_pushf(&argv, "%s...%s",
2057 oid_to_hex(&ours->object.oid),
2058 oid_to_hex(&theirs->object.oid));
2059 argv_array_push(&argv, "--");
2060
2061 init_revisions(&revs, NULL);
2062 setup_revisions(argv.argc, argv.argv, &revs, NULL);
2063 if (prepare_revision_walk(&revs))
2064 die("revision walk setup failed");
2065
2066 /* ... and count the commits on each side. */
2067 *num_ours = 0;
2068 *num_theirs = 0;
2069 while (1) {
2070 struct commit *c = get_revision(&revs);
2071 if (!c)
2072 break;
2073 if (c->object.flags & SYMMETRIC_LEFT)
2074 (*num_ours)++;
2075 else
2076 (*num_theirs)++;
2077 }
2078
2079 /* clear object flags smudged by the above traversal */
2080 clear_commit_marks(ours, ALL_REV_FLAGS);
2081 clear_commit_marks(theirs, ALL_REV_FLAGS);
2082
2083 argv_array_clear(&argv);
2084 return 0;
2085 }
2086
2087 /*
2088 * Return true when there is anything to report, otherwise false.
2089 */
2090 int format_tracking_info(struct branch *branch, struct strbuf *sb)
2091 {
2092 int ours, theirs;
2093 const char *full_base;
2094 char *base;
2095 int upstream_is_gone = 0;
2096
2097 if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2098 if (!full_base)
2099 return 0;
2100 upstream_is_gone = 1;
2101 }
2102
2103 base = shorten_unambiguous_ref(full_base, 0);
2104 if (upstream_is_gone) {
2105 strbuf_addf(sb,
2106 _("Your branch is based on '%s', but the upstream is gone.\n"),
2107 base);
2108 if (advice_status_hints)
2109 strbuf_addstr(sb,
2110 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2111 } else if (!ours && !theirs) {
2112 strbuf_addf(sb,
2113 _("Your branch is up to date with '%s'.\n"),
2114 base);
2115 } else if (!theirs) {
2116 strbuf_addf(sb,
2117 Q_("Your branch is ahead of '%s' by %d commit.\n",
2118 "Your branch is ahead of '%s' by %d commits.\n",
2119 ours),
2120 base, ours);
2121 if (advice_status_hints)
2122 strbuf_addstr(sb,
2123 _(" (use \"git push\" to publish your local commits)\n"));
2124 } else if (!ours) {
2125 strbuf_addf(sb,
2126 Q_("Your branch is behind '%s' by %d commit, "
2127 "and can be fast-forwarded.\n",
2128 "Your branch is behind '%s' by %d commits, "
2129 "and can be fast-forwarded.\n",
2130 theirs),
2131 base, theirs);
2132 if (advice_status_hints)
2133 strbuf_addstr(sb,
2134 _(" (use \"git pull\" to update your local branch)\n"));
2135 } else {
2136 strbuf_addf(sb,
2137 Q_("Your branch and '%s' have diverged,\n"
2138 "and have %d and %d different commit each, "
2139 "respectively.\n",
2140 "Your branch and '%s' have diverged,\n"
2141 "and have %d and %d different commits each, "
2142 "respectively.\n",
2143 ours + theirs),
2144 base, ours, theirs);
2145 if (advice_status_hints)
2146 strbuf_addstr(sb,
2147 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2148 }
2149 free(base);
2150 return 1;
2151 }
2152
2153 static int one_local_ref(const char *refname, const struct object_id *oid,
2154 int flag, void *cb_data)
2155 {
2156 struct ref ***local_tail = cb_data;
2157 struct ref *ref;
2158
2159 /* we already know it starts with refs/ to get here */
2160 if (check_refname_format(refname + 5, 0))
2161 return 0;
2162
2163 ref = alloc_ref(refname);
2164 oidcpy(&ref->new_oid, oid);
2165 **local_tail = ref;
2166 *local_tail = &ref->next;
2167 return 0;
2168 }
2169
2170 struct ref *get_local_heads(void)
2171 {
2172 struct ref *local_refs = NULL, **local_tail = &local_refs;
2173
2174 for_each_ref(one_local_ref, &local_tail);
2175 return local_refs;
2176 }
2177
2178 struct ref *guess_remote_head(const struct ref *head,
2179 const struct ref *refs,
2180 int all)
2181 {
2182 const struct ref *r;
2183 struct ref *list = NULL;
2184 struct ref **tail = &list;
2185
2186 if (!head)
2187 return NULL;
2188
2189 /*
2190 * Some transports support directly peeking at
2191 * where HEAD points; if that is the case, then
2192 * we don't have to guess.
2193 */
2194 if (head->symref)
2195 return copy_ref(find_ref_by_name(refs, head->symref));
2196
2197 /* If refs/heads/master could be right, it is. */
2198 if (!all) {
2199 r = find_ref_by_name(refs, "refs/heads/master");
2200 if (r && !oidcmp(&r->old_oid, &head->old_oid))
2201 return copy_ref(r);
2202 }
2203
2204 /* Look for another ref that points there */
2205 for (r = refs; r; r = r->next) {
2206 if (r != head &&
2207 starts_with(r->name, "refs/heads/") &&
2208 !oidcmp(&r->old_oid, &head->old_oid)) {
2209 *tail = copy_ref(r);
2210 tail = &((*tail)->next);
2211 if (!all)
2212 break;
2213 }
2214 }
2215
2216 return list;
2217 }
2218
2219 struct stale_heads_info {
2220 struct string_list *ref_names;
2221 struct ref **stale_refs_tail;
2222 struct refspec *refs;
2223 int ref_count;
2224 };
2225
2226 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2227 int flags, void *cb_data)
2228 {
2229 struct stale_heads_info *info = cb_data;
2230 struct string_list matches = STRING_LIST_INIT_DUP;
2231 struct refspec query;
2232 int i, stale = 1;
2233 memset(&query, 0, sizeof(struct refspec));
2234 query.dst = (char *)refname;
2235
2236 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2237 if (matches.nr == 0)
2238 goto clean_exit; /* No matches */
2239
2240 /*
2241 * If we did find a suitable refspec and it's not a symref and
2242 * it's not in the list of refs that currently exist in that
2243 * remote, we consider it to be stale. In order to deal with
2244 * overlapping refspecs, we need to go over all of the
2245 * matching refs.
2246 */
2247 if (flags & REF_ISSYMREF)
2248 goto clean_exit;
2249
2250 for (i = 0; stale && i < matches.nr; i++)
2251 if (string_list_has_string(info->ref_names, matches.items[i].string))
2252 stale = 0;
2253
2254 if (stale) {
2255 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2256 oidcpy(&ref->new_oid, oid);
2257 }
2258
2259 clean_exit:
2260 string_list_clear(&matches, 0);
2261 return 0;
2262 }
2263
2264 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2265 {
2266 struct ref *ref, *stale_refs = NULL;
2267 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2268 struct stale_heads_info info;
2269
2270 info.ref_names = &ref_names;
2271 info.stale_refs_tail = &stale_refs;
2272 info.refs = refs;
2273 info.ref_count = ref_count;
2274 for (ref = fetch_map; ref; ref = ref->next)
2275 string_list_append(&ref_names, ref->name);
2276 string_list_sort(&ref_names);
2277 for_each_ref(get_stale_heads_cb, &info);
2278 string_list_clear(&ref_names, 0);
2279 return stale_refs;
2280 }
2281
2282 /*
2283 * Compare-and-swap
2284 */
2285 static void clear_cas_option(struct push_cas_option *cas)
2286 {
2287 int i;
2288
2289 for (i = 0; i < cas->nr; i++)
2290 free(cas->entry[i].refname);
2291 free(cas->entry);
2292 memset(cas, 0, sizeof(*cas));
2293 }
2294
2295 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2296 const char *refname,
2297 size_t refnamelen)
2298 {
2299 struct push_cas *entry;
2300 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2301 entry = &cas->entry[cas->nr++];
2302 memset(entry, 0, sizeof(*entry));
2303 entry->refname = xmemdupz(refname, refnamelen);
2304 return entry;
2305 }
2306
2307 static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2308 {
2309 const char *colon;
2310 struct push_cas *entry;
2311
2312 if (unset) {
2313 /* "--no-<option>" */
2314 clear_cas_option(cas);
2315 return 0;
2316 }
2317
2318 if (!arg) {
2319 /* just "--<option>" */
2320 cas->use_tracking_for_rest = 1;
2321 return 0;
2322 }
2323
2324 /* "--<option>=refname" or "--<option>=refname:value" */
2325 colon = strchrnul(arg, ':');
2326 entry = add_cas_entry(cas, arg, colon - arg);
2327 if (!*colon)
2328 entry->use_tracking = 1;
2329 else if (!colon[1])
2330 oidclr(&entry->expect);
2331 else if (get_oid(colon + 1, &entry->expect))
2332 return error("cannot parse expected object name '%s'", colon + 1);
2333 return 0;
2334 }
2335
2336 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2337 {
2338 return parse_push_cas_option(opt->value, arg, unset);
2339 }
2340
2341 int is_empty_cas(const struct push_cas_option *cas)
2342 {
2343 return !cas->use_tracking_for_rest && !cas->nr;
2344 }
2345
2346 /*
2347 * Look at remote.fetch refspec and see if we have a remote
2348 * tracking branch for the refname there. Fill its current
2349 * value in sha1[].
2350 * If we cannot do so, return negative to signal an error.
2351 */
2352 static int remote_tracking(struct remote *remote, const char *refname,
2353 struct object_id *oid)
2354 {
2355 char *dst;
2356
2357 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2358 if (!dst)
2359 return -1; /* no tracking ref for refname at remote */
2360 if (read_ref(dst, oid))
2361 return -1; /* we know what the tracking ref is but we cannot read it */
2362 return 0;
2363 }
2364
2365 static void apply_cas(struct push_cas_option *cas,
2366 struct remote *remote,
2367 struct ref *ref)
2368 {
2369 int i;
2370
2371 /* Find an explicit --<option>=<name>[:<value>] entry */
2372 for (i = 0; i < cas->nr; i++) {
2373 struct push_cas *entry = &cas->entry[i];
2374 if (!refname_match(entry->refname, ref->name))
2375 continue;
2376 ref->expect_old_sha1 = 1;
2377 if (!entry->use_tracking)
2378 oidcpy(&ref->old_oid_expect, &entry->expect);
2379 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2380 oidclr(&ref->old_oid_expect);
2381 return;
2382 }
2383
2384 /* Are we using "--<option>" to cover all? */
2385 if (!cas->use_tracking_for_rest)
2386 return;
2387
2388 ref->expect_old_sha1 = 1;
2389 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2390 oidclr(&ref->old_oid_expect);
2391 }
2392
2393 void apply_push_cas(struct push_cas_option *cas,
2394 struct remote *remote,
2395 struct ref *remote_refs)
2396 {
2397 struct ref *ref;
2398 for (ref = remote_refs; ref; ref = ref->next)
2399 apply_cas(cas, remote, ref);
2400 }
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