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Merge branch 'master' of https://github.com/Softcatala/git-po
[git/debian.git] / remote.c
blobc10d87c24615e9d6497b46a69a82a71d3c1735a6
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 void add_prune_tags_to_fetch_refspec(struct remote *remote)
108 {
109 int nr = remote->fetch_refspec_nr;
110 int bufsize = nr + 1;
111 int size = sizeof(struct refspec);
112
113 remote->fetch = xrealloc(remote->fetch, size * bufsize);
114 memcpy(&remote->fetch[nr], tag_refspec, size);
115 add_fetch_refspec(remote, xstrdup(TAG_REFSPEC));
116 }
117
118 static void add_url(struct remote *remote, const char *url)
119 {
120 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
121 remote->url[remote->url_nr++] = url;
122 }
123
124 static void add_pushurl(struct remote *remote, const char *pushurl)
125 {
126 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
127 remote->pushurl[remote->pushurl_nr++] = pushurl;
128 }
129
130 static void add_pushurl_alias(struct remote *remote, const char *url)
131 {
132 const char *pushurl = alias_url(url, &rewrites_push);
133 if (pushurl != url)
134 add_pushurl(remote, pushurl);
135 }
136
137 static void add_url_alias(struct remote *remote, const char *url)
138 {
139 add_url(remote, alias_url(url, &rewrites));
140 add_pushurl_alias(remote, url);
141 }
142
143 struct remotes_hash_key {
144 const char *str;
145 int len;
146 };
147
148 static int remotes_hash_cmp(const void *unused_cmp_data,
149 const void *entry,
150 const void *entry_or_key,
151 const void *keydata)
152 {
153 const struct remote *a = entry;
154 const struct remote *b = entry_or_key;
155 const struct remotes_hash_key *key = keydata;
156
157 if (key)
158 return strncmp(a->name, key->str, key->len) || a->name[key->len];
159 else
160 return strcmp(a->name, b->name);
161 }
162
163 static inline void init_remotes_hash(void)
164 {
165 if (!remotes_hash.cmpfn)
166 hashmap_init(&remotes_hash, remotes_hash_cmp, NULL, 0);
167 }
168
169 static struct remote *make_remote(const char *name, int len)
170 {
171 struct remote *ret, *replaced;
172 struct remotes_hash_key lookup;
173 struct hashmap_entry lookup_entry;
174
175 if (!len)
176 len = strlen(name);
177
178 init_remotes_hash();
179 lookup.str = name;
180 lookup.len = len;
181 hashmap_entry_init(&lookup_entry, memhash(name, len));
182
183 if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
184 return ret;
185
186 ret = xcalloc(1, sizeof(struct remote));
187 ret->prune = -1; /* unspecified */
188 ret->prune_tags = -1; /* unspecified */
189 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
190 remotes[remotes_nr++] = ret;
191 ret->name = xstrndup(name, len);
192
193 hashmap_entry_init(ret, lookup_entry.hash);
194 replaced = hashmap_put(&remotes_hash, ret);
195 assert(replaced == NULL); /* no previous entry overwritten */
196 return ret;
197 }
198
199 static void add_merge(struct branch *branch, const char *name)
200 {
201 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
202 branch->merge_alloc);
203 branch->merge_name[branch->merge_nr++] = name;
204 }
205
206 static struct branch *make_branch(const char *name, int len)
207 {
208 struct branch *ret;
209 int i;
210
211 for (i = 0; i < branches_nr; i++) {
212 if (len ? (!strncmp(name, branches[i]->name, len) &&
213 !branches[i]->name[len]) :
214 !strcmp(name, branches[i]->name))
215 return branches[i];
216 }
217
218 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
219 ret = xcalloc(1, sizeof(struct branch));
220 branches[branches_nr++] = ret;
221 if (len)
222 ret->name = xstrndup(name, len);
223 else
224 ret->name = xstrdup(name);
225 ret->refname = xstrfmt("refs/heads/%s", ret->name);
226
227 return ret;
228 }
229
230 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
231 {
232 struct rewrite *ret;
233 int i;
234
235 for (i = 0; i < r->rewrite_nr; i++) {
236 if (len
237 ? (len == r->rewrite[i]->baselen &&
238 !strncmp(base, r->rewrite[i]->base, len))
239 : !strcmp(base, r->rewrite[i]->base))
240 return r->rewrite[i];
241 }
242
243 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
244 ret = xcalloc(1, sizeof(struct rewrite));
245 r->rewrite[r->rewrite_nr++] = ret;
246 if (len) {
247 ret->base = xstrndup(base, len);
248 ret->baselen = len;
249 }
250 else {
251 ret->base = xstrdup(base);
252 ret->baselen = strlen(base);
253 }
254 return ret;
255 }
256
257 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
258 {
259 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
260 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
261 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
262 rewrite->instead_of_nr++;
263 }
264
265 static const char *skip_spaces(const char *s)
266 {
267 while (isspace(*s))
268 s++;
269 return s;
270 }
271
272 static void read_remotes_file(struct remote *remote)
273 {
274 struct strbuf buf = STRBUF_INIT;
275 FILE *f = fopen_or_warn(git_path("remotes/%s", remote->name), "r");
276
277 if (!f)
278 return;
279 remote->configured_in_repo = 1;
280 remote->origin = REMOTE_REMOTES;
281 while (strbuf_getline(&buf, f) != EOF) {
282 const char *v;
283
284 strbuf_rtrim(&buf);
285
286 if (skip_prefix(buf.buf, "URL:", &v))
287 add_url_alias(remote, xstrdup(skip_spaces(v)));
288 else if (skip_prefix(buf.buf, "Push:", &v))
289 add_push_refspec(remote, xstrdup(skip_spaces(v)));
290 else if (skip_prefix(buf.buf, "Pull:", &v))
291 add_fetch_refspec(remote, xstrdup(skip_spaces(v)));
292 }
293 strbuf_release(&buf);
294 fclose(f);
295 }
296
297 static void read_branches_file(struct remote *remote)
298 {
299 char *frag;
300 struct strbuf buf = STRBUF_INIT;
301 FILE *f = fopen_or_warn(git_path("branches/%s", remote->name), "r");
302
303 if (!f)
304 return;
305
306 strbuf_getline_lf(&buf, f);
307 fclose(f);
308 strbuf_trim(&buf);
309 if (!buf.len) {
310 strbuf_release(&buf);
311 return;
312 }
313
314 remote->configured_in_repo = 1;
315 remote->origin = REMOTE_BRANCHES;
316
317 /*
318 * The branches file would have URL and optionally
319 * #branch specified. The "master" (or specified) branch is
320 * fetched and stored in the local branch matching the
321 * remote name.
322 */
323 frag = strchr(buf.buf, '#');
324 if (frag)
325 *(frag++) = '\0';
326 else
327 frag = "master";
328
329 add_url_alias(remote, strbuf_detach(&buf, NULL));
330 add_fetch_refspec(remote, xstrfmt("refs/heads/%s:refs/heads/%s",
331 frag, remote->name));
332
333 /*
334 * Cogito compatible push: push current HEAD to remote #branch
335 * (master if missing)
336 */
337 add_push_refspec(remote, xstrfmt("HEAD:refs/heads/%s", frag));
338 remote->fetch_tags = 1; /* always auto-follow */
339 }
340
341 static int handle_config(const char *key, const char *value, void *cb)
342 {
343 const char *name;
344 int namelen;
345 const char *subkey;
346 struct remote *remote;
347 struct branch *branch;
348 if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
349 if (!name)
350 return 0;
351 branch = make_branch(name, namelen);
352 if (!strcmp(subkey, "remote")) {
353 return git_config_string(&branch->remote_name, key, value);
354 } else if (!strcmp(subkey, "pushremote")) {
355 return git_config_string(&branch->pushremote_name, key, value);
356 } else if (!strcmp(subkey, "merge")) {
357 if (!value)
358 return config_error_nonbool(key);
359 add_merge(branch, xstrdup(value));
360 }
361 return 0;
362 }
363 if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
364 struct rewrite *rewrite;
365 if (!name)
366 return 0;
367 if (!strcmp(subkey, "insteadof")) {
368 rewrite = make_rewrite(&rewrites, name, namelen);
369 if (!value)
370 return config_error_nonbool(key);
371 add_instead_of(rewrite, xstrdup(value));
372 } else if (!strcmp(subkey, "pushinsteadof")) {
373 rewrite = make_rewrite(&rewrites_push, name, namelen);
374 if (!value)
375 return config_error_nonbool(key);
376 add_instead_of(rewrite, xstrdup(value));
377 }
378 }
379
380 if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
381 return 0;
382
383 /* Handle remote.* variables */
384 if (!name && !strcmp(subkey, "pushdefault"))
385 return git_config_string(&pushremote_name, key, value);
386
387 if (!name)
388 return 0;
389 /* Handle remote.<name>.* variables */
390 if (*name == '/') {
391 warning("Config remote shorthand cannot begin with '/': %s",
392 name);
393 return 0;
394 }
395 remote = make_remote(name, namelen);
396 remote->origin = REMOTE_CONFIG;
397 if (current_config_scope() == CONFIG_SCOPE_REPO)
398 remote->configured_in_repo = 1;
399 if (!strcmp(subkey, "mirror"))
400 remote->mirror = git_config_bool(key, value);
401 else if (!strcmp(subkey, "skipdefaultupdate"))
402 remote->skip_default_update = git_config_bool(key, value);
403 else if (!strcmp(subkey, "skipfetchall"))
404 remote->skip_default_update = git_config_bool(key, value);
405 else if (!strcmp(subkey, "prune"))
406 remote->prune = git_config_bool(key, value);
407 else if (!strcmp(subkey, "prunetags"))
408 remote->prune_tags = git_config_bool(key, value);
409 else if (!strcmp(subkey, "url")) {
410 const char *v;
411 if (git_config_string(&v, key, value))
412 return -1;
413 add_url(remote, v);
414 } else if (!strcmp(subkey, "pushurl")) {
415 const char *v;
416 if (git_config_string(&v, key, value))
417 return -1;
418 add_pushurl(remote, v);
419 } else if (!strcmp(subkey, "push")) {
420 const char *v;
421 if (git_config_string(&v, key, value))
422 return -1;
423 add_push_refspec(remote, v);
424 } else if (!strcmp(subkey, "fetch")) {
425 const char *v;
426 if (git_config_string(&v, key, value))
427 return -1;
428 add_fetch_refspec(remote, v);
429 } else if (!strcmp(subkey, "receivepack")) {
430 const char *v;
431 if (git_config_string(&v, key, value))
432 return -1;
433 if (!remote->receivepack)
434 remote->receivepack = v;
435 else
436 error("more than one receivepack given, using the first");
437 } else if (!strcmp(subkey, "uploadpack")) {
438 const char *v;
439 if (git_config_string(&v, key, value))
440 return -1;
441 if (!remote->uploadpack)
442 remote->uploadpack = v;
443 else
444 error("more than one uploadpack given, using the first");
445 } else if (!strcmp(subkey, "tagopt")) {
446 if (!strcmp(value, "--no-tags"))
447 remote->fetch_tags = -1;
448 else if (!strcmp(value, "--tags"))
449 remote->fetch_tags = 2;
450 } else if (!strcmp(subkey, "proxy")) {
451 return git_config_string((const char **)&remote->http_proxy,
452 key, value);
453 } else if (!strcmp(subkey, "proxyauthmethod")) {
454 return git_config_string((const char **)&remote->http_proxy_authmethod,
455 key, value);
456 } else if (!strcmp(subkey, "vcs")) {
457 return git_config_string(&remote->foreign_vcs, key, value);
458 }
459 return 0;
460 }
461
462 static void alias_all_urls(void)
463 {
464 int i, j;
465 for (i = 0; i < remotes_nr; i++) {
466 int add_pushurl_aliases;
467 if (!remotes[i])
468 continue;
469 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
470 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
471 }
472 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
473 for (j = 0; j < remotes[i]->url_nr; j++) {
474 if (add_pushurl_aliases)
475 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
476 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
477 }
478 }
479 }
480
481 static void read_config(void)
482 {
483 static int loaded;
484 int flag;
485
486 if (loaded)
487 return;
488 loaded = 1;
489
490 current_branch = NULL;
491 if (startup_info->have_repository) {
492 const char *head_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flag);
493 if (head_ref && (flag & REF_ISSYMREF) &&
494 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
495 current_branch = make_branch(head_ref, 0);
496 }
497 }
498 git_config(handle_config, NULL);
499 alias_all_urls();
500 }
501
502 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
503 {
504 int i;
505 struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
506
507 for (i = 0; i < nr_refspec; i++) {
508 size_t llen;
509 int is_glob;
510 const char *lhs, *rhs;
511 int flags;
512
513 is_glob = 0;
514
515 lhs = refspec[i];
516 if (*lhs == '+') {
517 rs[i].force = 1;
518 lhs++;
519 }
520
521 rhs = strrchr(lhs, ':');
522
523 /*
524 * Before going on, special case ":" (or "+:") as a refspec
525 * for pushing matching refs.
526 */
527 if (!fetch && rhs == lhs && rhs[1] == '\0') {
528 rs[i].matching = 1;
529 continue;
530 }
531
532 if (rhs) {
533 size_t rlen = strlen(++rhs);
534 is_glob = (1 <= rlen && strchr(rhs, '*'));
535 rs[i].dst = xstrndup(rhs, rlen);
536 }
537
538 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
539 if (1 <= llen && memchr(lhs, '*', llen)) {
540 if ((rhs && !is_glob) || (!rhs && fetch))
541 goto invalid;
542 is_glob = 1;
543 } else if (rhs && is_glob) {
544 goto invalid;
545 }
546
547 rs[i].pattern = is_glob;
548 rs[i].src = xstrndup(lhs, llen);
549 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
550
551 if (fetch) {
552 struct object_id unused;
553
554 /* LHS */
555 if (!*rs[i].src)
556 ; /* empty is ok; it means "HEAD" */
557 else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(rs[i].src, &unused))
558 rs[i].exact_sha1 = 1; /* ok */
559 else if (!check_refname_format(rs[i].src, flags))
560 ; /* valid looking ref is ok */
561 else
562 goto invalid;
563 /* RHS */
564 if (!rs[i].dst)
565 ; /* missing is ok; it is the same as empty */
566 else if (!*rs[i].dst)
567 ; /* empty is ok; it means "do not store" */
568 else if (!check_refname_format(rs[i].dst, flags))
569 ; /* valid looking ref is ok */
570 else
571 goto invalid;
572 } else {
573 /*
574 * LHS
575 * - empty is allowed; it means delete.
576 * - when wildcarded, it must be a valid looking ref.
577 * - otherwise, it must be an extended SHA-1, but
578 * there is no existing way to validate this.
579 */
580 if (!*rs[i].src)
581 ; /* empty is ok */
582 else if (is_glob) {
583 if (check_refname_format(rs[i].src, flags))
584 goto invalid;
585 }
586 else
587 ; /* anything goes, for now */
588 /*
589 * RHS
590 * - missing is allowed, but LHS then must be a
591 * valid looking ref.
592 * - empty is not allowed.
593 * - otherwise it must be a valid looking ref.
594 */
595 if (!rs[i].dst) {
596 if (check_refname_format(rs[i].src, flags))
597 goto invalid;
598 } else if (!*rs[i].dst) {
599 goto invalid;
600 } else {
601 if (check_refname_format(rs[i].dst, flags))
602 goto invalid;
603 }
604 }
605 }
606 return rs;
607
608 invalid:
609 if (verify) {
610 /*
611 * nr_refspec must be greater than zero and i must be valid
612 * since it is only possible to reach this point from within
613 * the for loop above.
614 */
615 free_refspec(i+1, rs);
616 return NULL;
617 }
618 die("Invalid refspec '%s'", refspec[i]);
619 }
620
621 int valid_fetch_refspec(const char *fetch_refspec_str)
622 {
623 struct refspec *refspec;
624
625 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
626 free_refspec(1, refspec);
627 return !!refspec;
628 }
629
630 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
631 {
632 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
633 }
634
635 struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
636 {
637 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
638 }
639
640 void free_refspec(int nr_refspec, struct refspec *refspec)
641 {
642 int i;
643
644 if (!refspec)
645 return;
646
647 for (i = 0; i < nr_refspec; i++) {
648 free(refspec[i].src);
649 free(refspec[i].dst);
650 }
651 free(refspec);
652 }
653
654 static int valid_remote_nick(const char *name)
655 {
656 if (!name[0] || is_dot_or_dotdot(name))
657 return 0;
658
659 /* remote nicknames cannot contain slashes */
660 while (*name)
661 if (is_dir_sep(*name++))
662 return 0;
663 return 1;
664 }
665
666 const char *remote_for_branch(struct branch *branch, int *explicit)
667 {
668 if (branch && branch->remote_name) {
669 if (explicit)
670 *explicit = 1;
671 return branch->remote_name;
672 }
673 if (explicit)
674 *explicit = 0;
675 return "origin";
676 }
677
678 const char *pushremote_for_branch(struct branch *branch, int *explicit)
679 {
680 if (branch && branch->pushremote_name) {
681 if (explicit)
682 *explicit = 1;
683 return branch->pushremote_name;
684 }
685 if (pushremote_name) {
686 if (explicit)
687 *explicit = 1;
688 return pushremote_name;
689 }
690 return remote_for_branch(branch, explicit);
691 }
692
693 const char *remote_ref_for_branch(struct branch *branch, int for_push,
694 int *explicit)
695 {
696 if (branch) {
697 if (!for_push) {
698 if (branch->merge_nr) {
699 if (explicit)
700 *explicit = 1;
701 return branch->merge_name[0];
702 }
703 } else {
704 const char *dst, *remote_name =
705 pushremote_for_branch(branch, NULL);
706 struct remote *remote = remote_get(remote_name);
707
708 if (remote && remote->push_refspec_nr &&
709 (dst = apply_refspecs(remote->push,
710 remote->push_refspec_nr,
711 branch->refname))) {
712 if (explicit)
713 *explicit = 1;
714 return dst;
715 }
716 }
717 }
718 if (explicit)
719 *explicit = 0;
720 return "";
721 }
722
723 static struct remote *remote_get_1(const char *name,
724 const char *(*get_default)(struct branch *, int *))
725 {
726 struct remote *ret;
727 int name_given = 0;
728
729 read_config();
730
731 if (name)
732 name_given = 1;
733 else
734 name = get_default(current_branch, &name_given);
735
736 ret = make_remote(name, 0);
737 if (valid_remote_nick(name) && have_git_dir()) {
738 if (!valid_remote(ret))
739 read_remotes_file(ret);
740 if (!valid_remote(ret))
741 read_branches_file(ret);
742 }
743 if (name_given && !valid_remote(ret))
744 add_url_alias(ret, name);
745 if (!valid_remote(ret))
746 return NULL;
747 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
748 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
749 return ret;
750 }
751
752 struct remote *remote_get(const char *name)
753 {
754 return remote_get_1(name, remote_for_branch);
755 }
756
757 struct remote *pushremote_get(const char *name)
758 {
759 return remote_get_1(name, pushremote_for_branch);
760 }
761
762 int remote_is_configured(struct remote *remote, int in_repo)
763 {
764 if (!remote)
765 return 0;
766 if (in_repo)
767 return remote->configured_in_repo;
768 return !!remote->origin;
769 }
770
771 int for_each_remote(each_remote_fn fn, void *priv)
772 {
773 int i, result = 0;
774 read_config();
775 for (i = 0; i < remotes_nr && !result; i++) {
776 struct remote *r = remotes[i];
777 if (!r)
778 continue;
779 if (!r->fetch)
780 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
781 r->fetch_refspec);
782 if (!r->push)
783 r->push = parse_push_refspec(r->push_refspec_nr,
784 r->push_refspec);
785 result = fn(r, priv);
786 }
787 return result;
788 }
789
790 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
791 {
792 if (strcmp(ref1->name, ref2->name)) {
793 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
794 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
795 die(_("Cannot fetch both %s and %s to %s"),
796 ref1->name, ref2->name, ref2->peer_ref->name);
797 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
798 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
799 warning(_("%s usually tracks %s, not %s"),
800 ref2->peer_ref->name, ref2->name, ref1->name);
801 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
802 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
803 die(_("%s tracks both %s and %s"),
804 ref2->peer_ref->name, ref1->name, ref2->name);
805 } else {
806 /*
807 * This last possibility doesn't occur because
808 * FETCH_HEAD_IGNORE entries always appear at
809 * the end of the list.
810 */
811 die(_("Internal error"));
812 }
813 }
814 free(ref2->peer_ref);
815 free(ref2);
816 }
817
818 struct ref *ref_remove_duplicates(struct ref *ref_map)
819 {
820 struct string_list refs = STRING_LIST_INIT_NODUP;
821 struct ref *retval = NULL;
822 struct ref **p = &retval;
823
824 while (ref_map) {
825 struct ref *ref = ref_map;
826
827 ref_map = ref_map->next;
828 ref->next = NULL;
829
830 if (!ref->peer_ref) {
831 *p = ref;
832 p = &ref->next;
833 } else {
834 struct string_list_item *item =
835 string_list_insert(&refs, ref->peer_ref->name);
836
837 if (item->util) {
838 /* Entry already existed */
839 handle_duplicate((struct ref *)item->util, ref);
840 } else {
841 *p = ref;
842 p = &ref->next;
843 item->util = ref;
844 }
845 }
846 }
847
848 string_list_clear(&refs, 0);
849 return retval;
850 }
851
852 int remote_has_url(struct remote *remote, const char *url)
853 {
854 int i;
855 for (i = 0; i < remote->url_nr; i++) {
856 if (!strcmp(remote->url[i], url))
857 return 1;
858 }
859 return 0;
860 }
861
862 static int match_name_with_pattern(const char *key, const char *name,
863 const char *value, char **result)
864 {
865 const char *kstar = strchr(key, '*');
866 size_t klen;
867 size_t ksuffixlen;
868 size_t namelen;
869 int ret;
870 if (!kstar)
871 die("Key '%s' of pattern had no '*'", key);
872 klen = kstar - key;
873 ksuffixlen = strlen(kstar + 1);
874 namelen = strlen(name);
875 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
876 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
877 if (ret && value) {
878 struct strbuf sb = STRBUF_INIT;
879 const char *vstar = strchr(value, '*');
880 if (!vstar)
881 die("Value '%s' of pattern has no '*'", value);
882 strbuf_add(&sb, value, vstar - value);
883 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
884 strbuf_addstr(&sb, vstar + 1);
885 *result = strbuf_detach(&sb, NULL);
886 }
887 return ret;
888 }
889
890 static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
891 {
892 int i;
893 int find_src = !query->src;
894
895 if (find_src && !query->dst)
896 error("query_refspecs_multiple: need either src or dst");
897
898 for (i = 0; i < ref_count; i++) {
899 struct refspec *refspec = &refs[i];
900 const char *key = find_src ? refspec->dst : refspec->src;
901 const char *value = find_src ? refspec->src : refspec->dst;
902 const char *needle = find_src ? query->dst : query->src;
903 char **result = find_src ? &query->src : &query->dst;
904
905 if (!refspec->dst)
906 continue;
907 if (refspec->pattern) {
908 if (match_name_with_pattern(key, needle, value, result))
909 string_list_append_nodup(results, *result);
910 } else if (!strcmp(needle, key)) {
911 string_list_append(results, value);
912 }
913 }
914 }
915
916 int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
917 {
918 int i;
919 int find_src = !query->src;
920 const char *needle = find_src ? query->dst : query->src;
921 char **result = find_src ? &query->src : &query->dst;
922
923 if (find_src && !query->dst)
924 return error("query_refspecs: need either src or dst");
925
926 for (i = 0; i < ref_count; i++) {
927 struct refspec *refspec = &refs[i];
928 const char *key = find_src ? refspec->dst : refspec->src;
929 const char *value = find_src ? refspec->src : refspec->dst;
930
931 if (!refspec->dst)
932 continue;
933 if (refspec->pattern) {
934 if (match_name_with_pattern(key, needle, value, result)) {
935 query->force = refspec->force;
936 return 0;
937 }
938 } else if (!strcmp(needle, key)) {
939 *result = xstrdup(value);
940 query->force = refspec->force;
941 return 0;
942 }
943 }
944 return -1;
945 }
946
947 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
948 const char *name)
949 {
950 struct refspec query;
951
952 memset(&query, 0, sizeof(struct refspec));
953 query.src = (char *)name;
954
955 if (query_refspecs(refspecs, nr_refspec, &query))
956 return NULL;
957
958 return query.dst;
959 }
960
961 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
962 {
963 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
964 }
965
966 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
967 const char *name)
968 {
969 size_t len = strlen(name);
970 struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
971 memcpy(ref->name, prefix, prefixlen);
972 memcpy(ref->name + prefixlen, name, len);
973 return ref;
974 }
975
976 struct ref *alloc_ref(const char *name)
977 {
978 return alloc_ref_with_prefix("", 0, name);
979 }
980
981 struct ref *copy_ref(const struct ref *ref)
982 {
983 struct ref *cpy;
984 size_t len;
985 if (!ref)
986 return NULL;
987 len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
988 cpy = xmalloc(len);
989 memcpy(cpy, ref, len);
990 cpy->next = NULL;
991 cpy->symref = xstrdup_or_null(ref->symref);
992 cpy->remote_status = xstrdup_or_null(ref->remote_status);
993 cpy->peer_ref = copy_ref(ref->peer_ref);
994 return cpy;
995 }
996
997 struct ref *copy_ref_list(const struct ref *ref)
998 {
999 struct ref *ret = NULL;
1000 struct ref **tail = &ret;
1001 while (ref) {
1002 *tail = copy_ref(ref);
1003 ref = ref->next;
1004 tail = &((*tail)->next);
1005 }
1006 return ret;
1007 }
1008
1009 static void free_ref(struct ref *ref)
1010 {
1011 if (!ref)
1012 return;
1013 free_ref(ref->peer_ref);
1014 free(ref->remote_status);
1015 free(ref->symref);
1016 free(ref);
1017 }
1018
1019 void free_refs(struct ref *ref)
1020 {
1021 struct ref *next;
1022 while (ref) {
1023 next = ref->next;
1024 free_ref(ref);
1025 ref = next;
1026 }
1027 }
1028
1029 int ref_compare_name(const void *va, const void *vb)
1030 {
1031 const struct ref *a = va, *b = vb;
1032 return strcmp(a->name, b->name);
1033 }
1034
1035 static void *ref_list_get_next(const void *a)
1036 {
1037 return ((const struct ref *)a)->next;
1038 }
1039
1040 static void ref_list_set_next(void *a, void *next)
1041 {
1042 ((struct ref *)a)->next = next;
1043 }
1044
1045 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1046 {
1047 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1048 }
1049
1050 int count_refspec_match(const char *pattern,
1051 struct ref *refs,
1052 struct ref **matched_ref)
1053 {
1054 int patlen = strlen(pattern);
1055 struct ref *matched_weak = NULL;
1056 struct ref *matched = NULL;
1057 int weak_match = 0;
1058 int match = 0;
1059
1060 for (weak_match = match = 0; refs; refs = refs->next) {
1061 char *name = refs->name;
1062 int namelen = strlen(name);
1063
1064 if (!refname_match(pattern, name))
1065 continue;
1066
1067 /* A match is "weak" if it is with refs outside
1068 * heads or tags, and did not specify the pattern
1069 * in full (e.g. "refs/remotes/origin/master") or at
1070 * least from the toplevel (e.g. "remotes/origin/master");
1071 * otherwise "git push $URL master" would result in
1072 * ambiguity between remotes/origin/master and heads/master
1073 * at the remote site.
1074 */
1075 if (namelen != patlen &&
1076 patlen != namelen - 5 &&
1077 !starts_with(name, "refs/heads/") &&
1078 !starts_with(name, "refs/tags/")) {
1079 /* We want to catch the case where only weak
1080 * matches are found and there are multiple
1081 * matches, and where more than one strong
1082 * matches are found, as ambiguous. One
1083 * strong match with zero or more weak matches
1084 * are acceptable as a unique match.
1085 */
1086 matched_weak = refs;
1087 weak_match++;
1088 }
1089 else {
1090 matched = refs;
1091 match++;
1092 }
1093 }
1094 if (!matched) {
1095 if (matched_ref)
1096 *matched_ref = matched_weak;
1097 return weak_match;
1098 }
1099 else {
1100 if (matched_ref)
1101 *matched_ref = matched;
1102 return match;
1103 }
1104 }
1105
1106 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1107 {
1108 **tail = ref;
1109 while (ref->next)
1110 ref = ref->next;
1111 *tail = &ref->next;
1112 }
1113
1114 static struct ref *alloc_delete_ref(void)
1115 {
1116 struct ref *ref = alloc_ref("(delete)");
1117 oidclr(&ref->new_oid);
1118 return ref;
1119 }
1120
1121 static int try_explicit_object_name(const char *name,
1122 struct ref **match)
1123 {
1124 struct object_id oid;
1125
1126 if (!*name) {
1127 if (match)
1128 *match = alloc_delete_ref();
1129 return 0;
1130 }
1131
1132 if (get_oid(name, &oid))
1133 return -1;
1134
1135 if (match) {
1136 *match = alloc_ref(name);
1137 oidcpy(&(*match)->new_oid, &oid);
1138 }
1139 return 0;
1140 }
1141
1142 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1143 {
1144 struct ref *ret = alloc_ref(name);
1145 tail_link_ref(ret, tail);
1146 return ret;
1147 }
1148
1149 static char *guess_ref(const char *name, struct ref *peer)
1150 {
1151 struct strbuf buf = STRBUF_INIT;
1152
1153 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1154 NULL, NULL);
1155 if (!r)
1156 return NULL;
1157
1158 if (starts_with(r, "refs/heads/"))
1159 strbuf_addstr(&buf, "refs/heads/");
1160 else if (starts_with(r, "refs/tags/"))
1161 strbuf_addstr(&buf, "refs/tags/");
1162 else
1163 return NULL;
1164
1165 strbuf_addstr(&buf, name);
1166 return strbuf_detach(&buf, NULL);
1167 }
1168
1169 static int match_explicit_lhs(struct ref *src,
1170 struct refspec *rs,
1171 struct ref **match,
1172 int *allocated_match)
1173 {
1174 switch (count_refspec_match(rs->src, src, match)) {
1175 case 1:
1176 if (allocated_match)
1177 *allocated_match = 0;
1178 return 0;
1179 case 0:
1180 /* The source could be in the get_sha1() format
1181 * not a reference name. :refs/other is a
1182 * way to delete 'other' ref at the remote end.
1183 */
1184 if (try_explicit_object_name(rs->src, match) < 0)
1185 return error("src refspec %s does not match any.", rs->src);
1186 if (allocated_match)
1187 *allocated_match = 1;
1188 return 0;
1189 default:
1190 return error("src refspec %s matches more than one.", rs->src);
1191 }
1192 }
1193
1194 static int match_explicit(struct ref *src, struct ref *dst,
1195 struct ref ***dst_tail,
1196 struct refspec *rs)
1197 {
1198 struct ref *matched_src, *matched_dst;
1199 int allocated_src;
1200
1201 const char *dst_value = rs->dst;
1202 char *dst_guess;
1203
1204 if (rs->pattern || rs->matching)
1205 return 0;
1206
1207 matched_src = matched_dst = NULL;
1208 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1209 return -1;
1210
1211 if (!dst_value) {
1212 int flag;
1213
1214 dst_value = resolve_ref_unsafe(matched_src->name,
1215 RESOLVE_REF_READING,
1216 NULL, &flag);
1217 if (!dst_value ||
1218 ((flag & REF_ISSYMREF) &&
1219 !starts_with(dst_value, "refs/heads/")))
1220 die("%s cannot be resolved to branch.",
1221 matched_src->name);
1222 }
1223
1224 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1225 case 1:
1226 break;
1227 case 0:
1228 if (starts_with(dst_value, "refs/"))
1229 matched_dst = make_linked_ref(dst_value, dst_tail);
1230 else if (is_null_oid(&matched_src->new_oid))
1231 error("unable to delete '%s': remote ref does not exist",
1232 dst_value);
1233 else if ((dst_guess = guess_ref(dst_value, matched_src))) {
1234 matched_dst = make_linked_ref(dst_guess, dst_tail);
1235 free(dst_guess);
1236 } else
1237 error("unable to push to unqualified destination: %s\n"
1238 "The destination refspec neither matches an "
1239 "existing ref on the remote nor\n"
1240 "begins with refs/, and we are unable to "
1241 "guess a prefix based on the source ref.",
1242 dst_value);
1243 break;
1244 default:
1245 matched_dst = NULL;
1246 error("dst refspec %s matches more than one.",
1247 dst_value);
1248 break;
1249 }
1250 if (!matched_dst)
1251 return -1;
1252 if (matched_dst->peer_ref)
1253 return error("dst ref %s receives from more than one src.",
1254 matched_dst->name);
1255 else {
1256 matched_dst->peer_ref = allocated_src ?
1257 matched_src :
1258 copy_ref(matched_src);
1259 matched_dst->force = rs->force;
1260 }
1261 return 0;
1262 }
1263
1264 static int match_explicit_refs(struct ref *src, struct ref *dst,
1265 struct ref ***dst_tail, struct refspec *rs,
1266 int rs_nr)
1267 {
1268 int i, errs;
1269 for (i = errs = 0; i < rs_nr; i++)
1270 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1271 return errs;
1272 }
1273
1274 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1275 int send_mirror, int direction, const struct refspec **ret_pat)
1276 {
1277 const struct refspec *pat;
1278 char *name;
1279 int i;
1280 int matching_refs = -1;
1281 for (i = 0; i < rs_nr; i++) {
1282 if (rs[i].matching &&
1283 (matching_refs == -1 || rs[i].force)) {
1284 matching_refs = i;
1285 continue;
1286 }
1287
1288 if (rs[i].pattern) {
1289 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1290 int match;
1291 if (direction == FROM_SRC)
1292 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1293 else
1294 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1295 if (match) {
1296 matching_refs = i;
1297 break;
1298 }
1299 }
1300 }
1301 if (matching_refs == -1)
1302 return NULL;
1303
1304 pat = rs + matching_refs;
1305 if (pat->matching) {
1306 /*
1307 * "matching refs"; traditionally we pushed everything
1308 * including refs outside refs/heads/ hierarchy, but
1309 * that does not make much sense these days.
1310 */
1311 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1312 return NULL;
1313 name = xstrdup(ref->name);
1314 }
1315 if (ret_pat)
1316 *ret_pat = pat;
1317 return name;
1318 }
1319
1320 static struct ref **tail_ref(struct ref **head)
1321 {
1322 struct ref **tail = head;
1323 while (*tail)
1324 tail = &((*tail)->next);
1325 return tail;
1326 }
1327
1328 struct tips {
1329 struct commit **tip;
1330 int nr, alloc;
1331 };
1332
1333 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1334 {
1335 struct commit *commit;
1336
1337 if (is_null_oid(oid))
1338 return;
1339 commit = lookup_commit_reference_gently(oid, 1);
1340 if (!commit || (commit->object.flags & TMP_MARK))
1341 return;
1342 commit->object.flags |= TMP_MARK;
1343 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1344 tips->tip[tips->nr++] = commit;
1345 }
1346
1347 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1348 {
1349 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1350 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1351 struct string_list_item *item;
1352 struct ref *ref;
1353 struct tips sent_tips;
1354
1355 /*
1356 * Collect everything we know they would have at the end of
1357 * this push, and collect all tags they have.
1358 */
1359 memset(&sent_tips, 0, sizeof(sent_tips));
1360 for (ref = *dst; ref; ref = ref->next) {
1361 if (ref->peer_ref &&
1362 !is_null_oid(&ref->peer_ref->new_oid))
1363 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1364 else
1365 add_to_tips(&sent_tips, &ref->old_oid);
1366 if (starts_with(ref->name, "refs/tags/"))
1367 string_list_append(&dst_tag, ref->name);
1368 }
1369 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1370
1371 string_list_sort(&dst_tag);
1372
1373 /* Collect tags they do not have. */
1374 for (ref = src; ref; ref = ref->next) {
1375 if (!starts_with(ref->name, "refs/tags/"))
1376 continue; /* not a tag */
1377 if (string_list_has_string(&dst_tag, ref->name))
1378 continue; /* they already have it */
1379 if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
1380 continue; /* be conservative */
1381 item = string_list_append(&src_tag, ref->name);
1382 item->util = ref;
1383 }
1384 string_list_clear(&dst_tag, 0);
1385
1386 /*
1387 * At this point, src_tag lists tags that are missing from
1388 * dst, and sent_tips lists the tips we are pushing or those
1389 * that we know they already have. An element in the src_tag
1390 * that is an ancestor of any of the sent_tips needs to be
1391 * sent to the other side.
1392 */
1393 if (sent_tips.nr) {
1394 for_each_string_list_item(item, &src_tag) {
1395 struct ref *ref = item->util;
1396 struct ref *dst_ref;
1397 struct commit *commit;
1398
1399 if (is_null_oid(&ref->new_oid))
1400 continue;
1401 commit = lookup_commit_reference_gently(&ref->new_oid,
1402 1);
1403 if (!commit)
1404 /* not pushing a commit, which is not an error */
1405 continue;
1406
1407 /*
1408 * Is this tag, which they do not have, reachable from
1409 * any of the commits we are sending?
1410 */
1411 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1412 continue;
1413
1414 /* Add it in */
1415 dst_ref = make_linked_ref(ref->name, dst_tail);
1416 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1417 dst_ref->peer_ref = copy_ref(ref);
1418 }
1419 }
1420 string_list_clear(&src_tag, 0);
1421 free(sent_tips.tip);
1422 }
1423
1424 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1425 {
1426 for ( ; list; list = list->next)
1427 if (!strcmp(list->name, name))
1428 return (struct ref *)list;
1429 return NULL;
1430 }
1431
1432 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1433 {
1434 for ( ; ref; ref = ref->next)
1435 string_list_append_nodup(ref_index, ref->name)->util = ref;
1436
1437 string_list_sort(ref_index);
1438 }
1439
1440 /*
1441 * Given only the set of local refs, sanity-check the set of push
1442 * refspecs. We can't catch all errors that match_push_refs would,
1443 * but we can catch some errors early before even talking to the
1444 * remote side.
1445 */
1446 int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1447 {
1448 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1449 int ret = 0;
1450 int i;
1451
1452 for (i = 0; i < nr_refspec; i++) {
1453 struct refspec *rs = refspec + i;
1454
1455 if (rs->pattern || rs->matching)
1456 continue;
1457
1458 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1459 }
1460
1461 free_refspec(nr_refspec, refspec);
1462 return ret;
1463 }
1464
1465 /*
1466 * Given the set of refs the local repository has, the set of refs the
1467 * remote repository has, and the refspec used for push, determine
1468 * what remote refs we will update and with what value by setting
1469 * peer_ref (which object is being pushed) and force (if the push is
1470 * forced) in elements of "dst". The function may add new elements to
1471 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1472 */
1473 int match_push_refs(struct ref *src, struct ref **dst,
1474 int nr_refspec, const char **refspec, int flags)
1475 {
1476 struct refspec *rs;
1477 int send_all = flags & MATCH_REFS_ALL;
1478 int send_mirror = flags & MATCH_REFS_MIRROR;
1479 int send_prune = flags & MATCH_REFS_PRUNE;
1480 int errs;
1481 static const char *default_refspec[] = { ":", NULL };
1482 struct ref *ref, **dst_tail = tail_ref(dst);
1483 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1484
1485 if (!nr_refspec) {
1486 nr_refspec = 1;
1487 refspec = default_refspec;
1488 }
1489 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1490 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1491
1492 /* pick the remainder */
1493 for (ref = src; ref; ref = ref->next) {
1494 struct string_list_item *dst_item;
1495 struct ref *dst_peer;
1496 const struct refspec *pat = NULL;
1497 char *dst_name;
1498
1499 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1500 if (!dst_name)
1501 continue;
1502
1503 if (!dst_ref_index.nr)
1504 prepare_ref_index(&dst_ref_index, *dst);
1505
1506 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1507 dst_peer = dst_item ? dst_item->util : NULL;
1508 if (dst_peer) {
1509 if (dst_peer->peer_ref)
1510 /* We're already sending something to this ref. */
1511 goto free_name;
1512 } else {
1513 if (pat->matching && !(send_all || send_mirror))
1514 /*
1515 * Remote doesn't have it, and we have no
1516 * explicit pattern, and we don't have
1517 * --all or --mirror.
1518 */
1519 goto free_name;
1520
1521 /* Create a new one and link it */
1522 dst_peer = make_linked_ref(dst_name, &dst_tail);
1523 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1524 string_list_insert(&dst_ref_index,
1525 dst_peer->name)->util = dst_peer;
1526 }
1527 dst_peer->peer_ref = copy_ref(ref);
1528 dst_peer->force = pat->force;
1529 free_name:
1530 free(dst_name);
1531 }
1532
1533 string_list_clear(&dst_ref_index, 0);
1534
1535 if (flags & MATCH_REFS_FOLLOW_TAGS)
1536 add_missing_tags(src, dst, &dst_tail);
1537
1538 if (send_prune) {
1539 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1540 /* check for missing refs on the remote */
1541 for (ref = *dst; ref; ref = ref->next) {
1542 char *src_name;
1543
1544 if (ref->peer_ref)
1545 /* We're already sending something to this ref. */
1546 continue;
1547
1548 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1549 if (src_name) {
1550 if (!src_ref_index.nr)
1551 prepare_ref_index(&src_ref_index, src);
1552 if (!string_list_has_string(&src_ref_index,
1553 src_name))
1554 ref->peer_ref = alloc_delete_ref();
1555 free(src_name);
1556 }
1557 }
1558 string_list_clear(&src_ref_index, 0);
1559 }
1560 if (errs)
1561 return -1;
1562 return 0;
1563 }
1564
1565 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1566 int force_update)
1567 {
1568 struct ref *ref;
1569
1570 for (ref = remote_refs; ref; ref = ref->next) {
1571 int force_ref_update = ref->force || force_update;
1572 int reject_reason = 0;
1573
1574 if (ref->peer_ref)
1575 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1576 else if (!send_mirror)
1577 continue;
1578
1579 ref->deletion = is_null_oid(&ref->new_oid);
1580 if (!ref->deletion &&
1581 !oidcmp(&ref->old_oid, &ref->new_oid)) {
1582 ref->status = REF_STATUS_UPTODATE;
1583 continue;
1584 }
1585
1586 /*
1587 * If the remote ref has moved and is now different
1588 * from what we expect, reject any push.
1589 *
1590 * It also is an error if the user told us to check
1591 * with the remote-tracking branch to find the value
1592 * to expect, but we did not have such a tracking
1593 * branch.
1594 */
1595 if (ref->expect_old_sha1) {
1596 if (oidcmp(&ref->old_oid, &ref->old_oid_expect))
1597 reject_reason = REF_STATUS_REJECT_STALE;
1598 else
1599 /* If the ref isn't stale then force the update. */
1600 force_ref_update = 1;
1601 }
1602
1603 /*
1604 * If the update isn't already rejected then check
1605 * the usual "must fast-forward" rules.
1606 *
1607 * Decide whether an individual refspec A:B can be
1608 * pushed. The push will succeed if any of the
1609 * following are true:
1610 *
1611 * (1) the remote reference B does not exist
1612 *
1613 * (2) the remote reference B is being removed (i.e.,
1614 * pushing :B where no source is specified)
1615 *
1616 * (3) the destination is not under refs/tags/, and
1617 * if the old and new value is a commit, the new
1618 * is a descendant of the old.
1619 *
1620 * (4) it is forced using the +A:B notation, or by
1621 * passing the --force argument
1622 */
1623
1624 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1625 if (starts_with(ref->name, "refs/tags/"))
1626 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1627 else if (!has_object_file(&ref->old_oid))
1628 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1629 else if (!lookup_commit_reference_gently(&ref->old_oid, 1) ||
1630 !lookup_commit_reference_gently(&ref->new_oid, 1))
1631 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1632 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1633 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1634 }
1635
1636 /*
1637 * "--force" will defeat any rejection implemented
1638 * by the rules above.
1639 */
1640 if (!force_ref_update)
1641 ref->status = reject_reason;
1642 else if (reject_reason)
1643 ref->forced_update = 1;
1644 }
1645 }
1646
1647 static void set_merge(struct branch *ret)
1648 {
1649 struct remote *remote;
1650 char *ref;
1651 struct object_id oid;
1652 int i;
1653
1654 if (!ret)
1655 return; /* no branch */
1656 if (ret->merge)
1657 return; /* already run */
1658 if (!ret->remote_name || !ret->merge_nr) {
1659 /*
1660 * no merge config; let's make sure we don't confuse callers
1661 * with a non-zero merge_nr but a NULL merge
1662 */
1663 ret->merge_nr = 0;
1664 return;
1665 }
1666
1667 remote = remote_get(ret->remote_name);
1668
1669 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1670 for (i = 0; i < ret->merge_nr; i++) {
1671 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1672 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1673 if (!remote_find_tracking(remote, ret->merge[i]) ||
1674 strcmp(ret->remote_name, "."))
1675 continue;
1676 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1677 &oid, &ref) == 1)
1678 ret->merge[i]->dst = ref;
1679 else
1680 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1681 }
1682 }
1683
1684 struct branch *branch_get(const char *name)
1685 {
1686 struct branch *ret;
1687
1688 read_config();
1689 if (!name || !*name || !strcmp(name, "HEAD"))
1690 ret = current_branch;
1691 else
1692 ret = make_branch(name, 0);
1693 set_merge(ret);
1694 return ret;
1695 }
1696
1697 int branch_has_merge_config(struct branch *branch)
1698 {
1699 return branch && !!branch->merge;
1700 }
1701
1702 int branch_merge_matches(struct branch *branch,
1703 int i,
1704 const char *refname)
1705 {
1706 if (!branch || i < 0 || i >= branch->merge_nr)
1707 return 0;
1708 return refname_match(branch->merge[i]->src, refname);
1709 }
1710
1711 __attribute__((format (printf,2,3)))
1712 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1713 {
1714 if (err) {
1715 va_list ap;
1716 va_start(ap, fmt);
1717 strbuf_vaddf(err, fmt, ap);
1718 va_end(ap);
1719 }
1720 return NULL;
1721 }
1722
1723 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1724 {
1725 if (!branch)
1726 return error_buf(err, _("HEAD does not point to a branch"));
1727
1728 if (!branch->merge || !branch->merge[0]) {
1729 /*
1730 * no merge config; is it because the user didn't define any,
1731 * or because it is not a real branch, and get_branch
1732 * auto-vivified it?
1733 */
1734 if (!ref_exists(branch->refname))
1735 return error_buf(err, _("no such branch: '%s'"),
1736 branch->name);
1737 return error_buf(err,
1738 _("no upstream configured for branch '%s'"),
1739 branch->name);
1740 }
1741
1742 if (!branch->merge[0]->dst)
1743 return error_buf(err,
1744 _("upstream branch '%s' not stored as a remote-tracking branch"),
1745 branch->merge[0]->src);
1746
1747 return branch->merge[0]->dst;
1748 }
1749
1750 static const char *tracking_for_push_dest(struct remote *remote,
1751 const char *refname,
1752 struct strbuf *err)
1753 {
1754 char *ret;
1755
1756 ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1757 if (!ret)
1758 return error_buf(err,
1759 _("push destination '%s' on remote '%s' has no local tracking branch"),
1760 refname, remote->name);
1761 return ret;
1762 }
1763
1764 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1765 {
1766 struct remote *remote;
1767
1768 remote = remote_get(pushremote_for_branch(branch, NULL));
1769 if (!remote)
1770 return error_buf(err,
1771 _("branch '%s' has no remote for pushing"),
1772 branch->name);
1773
1774 if (remote->push_refspec_nr) {
1775 char *dst;
1776 const char *ret;
1777
1778 dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1779 branch->refname);
1780 if (!dst)
1781 return error_buf(err,
1782 _("push refspecs for '%s' do not include '%s'"),
1783 remote->name, branch->name);
1784
1785 ret = tracking_for_push_dest(remote, dst, err);
1786 free(dst);
1787 return ret;
1788 }
1789
1790 if (remote->mirror)
1791 return tracking_for_push_dest(remote, branch->refname, err);
1792
1793 switch (push_default) {
1794 case PUSH_DEFAULT_NOTHING:
1795 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1796
1797 case PUSH_DEFAULT_MATCHING:
1798 case PUSH_DEFAULT_CURRENT:
1799 return tracking_for_push_dest(remote, branch->refname, err);
1800
1801 case PUSH_DEFAULT_UPSTREAM:
1802 return branch_get_upstream(branch, err);
1803
1804 case PUSH_DEFAULT_UNSPECIFIED:
1805 case PUSH_DEFAULT_SIMPLE:
1806 {
1807 const char *up, *cur;
1808
1809 up = branch_get_upstream(branch, err);
1810 if (!up)
1811 return NULL;
1812 cur = tracking_for_push_dest(remote, branch->refname, err);
1813 if (!cur)
1814 return NULL;
1815 if (strcmp(cur, up))
1816 return error_buf(err,
1817 _("cannot resolve 'simple' push to a single destination"));
1818 return cur;
1819 }
1820 }
1821
1822 die("BUG: unhandled push situation");
1823 }
1824
1825 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1826 {
1827 if (!branch)
1828 return error_buf(err, _("HEAD does not point to a branch"));
1829
1830 if (!branch->push_tracking_ref)
1831 branch->push_tracking_ref = branch_get_push_1(branch, err);
1832 return branch->push_tracking_ref;
1833 }
1834
1835 static int ignore_symref_update(const char *refname)
1836 {
1837 int flag;
1838
1839 if (!resolve_ref_unsafe(refname, 0, NULL, &flag))
1840 return 0; /* non-existing refs are OK */
1841 return (flag & REF_ISSYMREF);
1842 }
1843
1844 /*
1845 * Create and return a list of (struct ref) consisting of copies of
1846 * each remote_ref that matches refspec. refspec must be a pattern.
1847 * Fill in the copies' peer_ref to describe the local tracking refs to
1848 * which they map. Omit any references that would map to an existing
1849 * local symbolic ref.
1850 */
1851 static struct ref *get_expanded_map(const struct ref *remote_refs,
1852 const struct refspec *refspec)
1853 {
1854 const struct ref *ref;
1855 struct ref *ret = NULL;
1856 struct ref **tail = &ret;
1857
1858 for (ref = remote_refs; ref; ref = ref->next) {
1859 char *expn_name = NULL;
1860
1861 if (strchr(ref->name, '^'))
1862 continue; /* a dereference item */
1863 if (match_name_with_pattern(refspec->src, ref->name,
1864 refspec->dst, &expn_name) &&
1865 !ignore_symref_update(expn_name)) {
1866 struct ref *cpy = copy_ref(ref);
1867
1868 cpy->peer_ref = alloc_ref(expn_name);
1869 if (refspec->force)
1870 cpy->peer_ref->force = 1;
1871 *tail = cpy;
1872 tail = &cpy->next;
1873 }
1874 free(expn_name);
1875 }
1876
1877 return ret;
1878 }
1879
1880 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1881 {
1882 const struct ref *ref;
1883 for (ref = refs; ref; ref = ref->next) {
1884 if (refname_match(name, ref->name))
1885 return ref;
1886 }
1887 return NULL;
1888 }
1889
1890 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1891 {
1892 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1893
1894 if (!ref)
1895 return NULL;
1896
1897 return copy_ref(ref);
1898 }
1899
1900 static struct ref *get_local_ref(const char *name)
1901 {
1902 if (!name || name[0] == '\0')
1903 return NULL;
1904
1905 if (starts_with(name, "refs/"))
1906 return alloc_ref(name);
1907
1908 if (starts_with(name, "heads/") ||
1909 starts_with(name, "tags/") ||
1910 starts_with(name, "remotes/"))
1911 return alloc_ref_with_prefix("refs/", 5, name);
1912
1913 return alloc_ref_with_prefix("refs/heads/", 11, name);
1914 }
1915
1916 int get_fetch_map(const struct ref *remote_refs,
1917 const struct refspec *refspec,
1918 struct ref ***tail,
1919 int missing_ok)
1920 {
1921 struct ref *ref_map, **rmp;
1922
1923 if (refspec->pattern) {
1924 ref_map = get_expanded_map(remote_refs, refspec);
1925 } else {
1926 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1927
1928 if (refspec->exact_sha1) {
1929 ref_map = alloc_ref(name);
1930 get_oid_hex(name, &ref_map->old_oid);
1931 } else {
1932 ref_map = get_remote_ref(remote_refs, name);
1933 }
1934 if (!missing_ok && !ref_map)
1935 die("Couldn't find remote ref %s", name);
1936 if (ref_map) {
1937 ref_map->peer_ref = get_local_ref(refspec->dst);
1938 if (ref_map->peer_ref && refspec->force)
1939 ref_map->peer_ref->force = 1;
1940 }
1941 }
1942
1943 for (rmp = &ref_map; *rmp; ) {
1944 if ((*rmp)->peer_ref) {
1945 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1946 check_refname_format((*rmp)->peer_ref->name, 0)) {
1947 struct ref *ignore = *rmp;
1948 error("* Ignoring funny ref '%s' locally",
1949 (*rmp)->peer_ref->name);
1950 *rmp = (*rmp)->next;
1951 free(ignore->peer_ref);
1952 free(ignore);
1953 continue;
1954 }
1955 }
1956 rmp = &((*rmp)->next);
1957 }
1958
1959 if (ref_map)
1960 tail_link_ref(ref_map, tail);
1961
1962 return 0;
1963 }
1964
1965 int resolve_remote_symref(struct ref *ref, struct ref *list)
1966 {
1967 if (!ref->symref)
1968 return 0;
1969 for (; list; list = list->next)
1970 if (!strcmp(ref->symref, list->name)) {
1971 oidcpy(&ref->old_oid, &list->old_oid);
1972 return 0;
1973 }
1974 return 1;
1975 }
1976
1977 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1978 {
1979 while (list) {
1980 struct commit *commit = pop_commit(&list);
1981 commit->object.flags &= ~mark;
1982 }
1983 }
1984
1985 int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
1986 {
1987 struct object *o;
1988 struct commit *old_commit, *new_commit;
1989 struct commit_list *list, *used;
1990 int found = 0;
1991
1992 /*
1993 * Both new_commit and old_commit must be commit-ish and new_commit is descendant of
1994 * old_commit. Otherwise we require --force.
1995 */
1996 o = deref_tag(parse_object(old_oid), NULL, 0);
1997 if (!o || o->type != OBJ_COMMIT)
1998 return 0;
1999 old_commit = (struct commit *) o;
2000
2001 o = deref_tag(parse_object(new_oid), NULL, 0);
2002 if (!o || o->type != OBJ_COMMIT)
2003 return 0;
2004 new_commit = (struct commit *) o;
2005
2006 if (parse_commit(new_commit) < 0)
2007 return 0;
2008
2009 used = list = NULL;
2010 commit_list_insert(new_commit, &list);
2011 while (list) {
2012 new_commit = pop_most_recent_commit(&list, TMP_MARK);
2013 commit_list_insert(new_commit, &used);
2014 if (new_commit == old_commit) {
2015 found = 1;
2016 break;
2017 }
2018 }
2019 unmark_and_free(list, TMP_MARK);
2020 unmark_and_free(used, TMP_MARK);
2021 return found;
2022 }
2023
2024 /*
2025 * Lookup the upstream branch for the given branch and if present, optionally
2026 * compute the commit ahead/behind values for the pair.
2027 *
2028 * If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
2029 * counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
2030 * the (potentially expensive) a/b computation (*num_ours and *num_theirs are
2031 * set to zero).
2032 *
2033 * The name of the upstream branch (or NULL if no upstream is defined) is
2034 * returned via *upstream_name, if it is not itself NULL.
2035 *
2036 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
2037 * upstream defined, or ref does not exist). Returns 0 if the commits are
2038 * identical. Returns 1 if commits are different.
2039 */
2040 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
2041 const char **upstream_name, enum ahead_behind_flags abf)
2042 {
2043 struct object_id oid;
2044 struct commit *ours, *theirs;
2045 struct rev_info revs;
2046 const char *base;
2047 struct argv_array argv = ARGV_ARRAY_INIT;
2048
2049 /* Cannot stat unless we are marked to build on top of somebody else. */
2050 base = branch_get_upstream(branch, NULL);
2051 if (upstream_name)
2052 *upstream_name = base;
2053 if (!base)
2054 return -1;
2055
2056 /* Cannot stat if what we used to build on no longer exists */
2057 if (read_ref(base, &oid))
2058 return -1;
2059 theirs = lookup_commit_reference(&oid);
2060 if (!theirs)
2061 return -1;
2062
2063 if (read_ref(branch->refname, &oid))
2064 return -1;
2065 ours = lookup_commit_reference(&oid);
2066 if (!ours)
2067 return -1;
2068
2069 *num_theirs = *num_ours = 0;
2070
2071 /* are we the same? */
2072 if (theirs == ours)
2073 return 0;
2074 if (abf == AHEAD_BEHIND_QUICK)
2075 return 1;
2076 if (abf != AHEAD_BEHIND_FULL)
2077 BUG("stat_tracking_info: invalid abf '%d'", abf);
2078
2079 /* Run "rev-list --left-right ours...theirs" internally... */
2080 argv_array_push(&argv, ""); /* ignored */
2081 argv_array_push(&argv, "--left-right");
2082 argv_array_pushf(&argv, "%s...%s",
2083 oid_to_hex(&ours->object.oid),
2084 oid_to_hex(&theirs->object.oid));
2085 argv_array_push(&argv, "--");
2086
2087 init_revisions(&revs, NULL);
2088 setup_revisions(argv.argc, argv.argv, &revs, NULL);
2089 if (prepare_revision_walk(&revs))
2090 die("revision walk setup failed");
2091
2092 /* ... and count the commits on each side. */
2093 while (1) {
2094 struct commit *c = get_revision(&revs);
2095 if (!c)
2096 break;
2097 if (c->object.flags & SYMMETRIC_LEFT)
2098 (*num_ours)++;
2099 else
2100 (*num_theirs)++;
2101 }
2102
2103 /* clear object flags smudged by the above traversal */
2104 clear_commit_marks(ours, ALL_REV_FLAGS);
2105 clear_commit_marks(theirs, ALL_REV_FLAGS);
2106
2107 argv_array_clear(&argv);
2108 return 1;
2109 }
2110
2111 /*
2112 * Return true when there is anything to report, otherwise false.
2113 */
2114 int format_tracking_info(struct branch *branch, struct strbuf *sb,
2115 enum ahead_behind_flags abf)
2116 {
2117 int ours, theirs, sti;
2118 const char *full_base;
2119 char *base;
2120 int upstream_is_gone = 0;
2121
2122 sti = stat_tracking_info(branch, &ours, &theirs, &full_base, abf);
2123 if (sti < 0) {
2124 if (!full_base)
2125 return 0;
2126 upstream_is_gone = 1;
2127 }
2128
2129 base = shorten_unambiguous_ref(full_base, 0);
2130 if (upstream_is_gone) {
2131 strbuf_addf(sb,
2132 _("Your branch is based on '%s', but the upstream is gone.\n"),
2133 base);
2134 if (advice_status_hints)
2135 strbuf_addstr(sb,
2136 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2137 } else if (!sti) {
2138 strbuf_addf(sb,
2139 _("Your branch is up to date with '%s'.\n"),
2140 base);
2141 } else if (abf == AHEAD_BEHIND_QUICK) {
2142 strbuf_addf(sb,
2143 _("Your branch and '%s' refer to different commits.\n"),
2144 base);
2145 if (advice_status_hints)
2146 strbuf_addf(sb, _(" (use \"%s\" for details)\n"),
2147 "git status --ahead-behind");
2148 } else if (!theirs) {
2149 strbuf_addf(sb,
2150 Q_("Your branch is ahead of '%s' by %d commit.\n",
2151 "Your branch is ahead of '%s' by %d commits.\n",
2152 ours),
2153 base, ours);
2154 if (advice_status_hints)
2155 strbuf_addstr(sb,
2156 _(" (use \"git push\" to publish your local commits)\n"));
2157 } else if (!ours) {
2158 strbuf_addf(sb,
2159 Q_("Your branch is behind '%s' by %d commit, "
2160 "and can be fast-forwarded.\n",
2161 "Your branch is behind '%s' by %d commits, "
2162 "and can be fast-forwarded.\n",
2163 theirs),
2164 base, theirs);
2165 if (advice_status_hints)
2166 strbuf_addstr(sb,
2167 _(" (use \"git pull\" to update your local branch)\n"));
2168 } else {
2169 strbuf_addf(sb,
2170 Q_("Your branch and '%s' have diverged,\n"
2171 "and have %d and %d different commit each, "
2172 "respectively.\n",
2173 "Your branch and '%s' have diverged,\n"
2174 "and have %d and %d different commits each, "
2175 "respectively.\n",
2176 ours + theirs),
2177 base, ours, theirs);
2178 if (advice_status_hints)
2179 strbuf_addstr(sb,
2180 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2181 }
2182 free(base);
2183 return 1;
2184 }
2185
2186 static int one_local_ref(const char *refname, const struct object_id *oid,
2187 int flag, void *cb_data)
2188 {
2189 struct ref ***local_tail = cb_data;
2190 struct ref *ref;
2191
2192 /* we already know it starts with refs/ to get here */
2193 if (check_refname_format(refname + 5, 0))
2194 return 0;
2195
2196 ref = alloc_ref(refname);
2197 oidcpy(&ref->new_oid, oid);
2198 **local_tail = ref;
2199 *local_tail = &ref->next;
2200 return 0;
2201 }
2202
2203 struct ref *get_local_heads(void)
2204 {
2205 struct ref *local_refs = NULL, **local_tail = &local_refs;
2206
2207 for_each_ref(one_local_ref, &local_tail);
2208 return local_refs;
2209 }
2210
2211 struct ref *guess_remote_head(const struct ref *head,
2212 const struct ref *refs,
2213 int all)
2214 {
2215 const struct ref *r;
2216 struct ref *list = NULL;
2217 struct ref **tail = &list;
2218
2219 if (!head)
2220 return NULL;
2221
2222 /*
2223 * Some transports support directly peeking at
2224 * where HEAD points; if that is the case, then
2225 * we don't have to guess.
2226 */
2227 if (head->symref)
2228 return copy_ref(find_ref_by_name(refs, head->symref));
2229
2230 /* If refs/heads/master could be right, it is. */
2231 if (!all) {
2232 r = find_ref_by_name(refs, "refs/heads/master");
2233 if (r && !oidcmp(&r->old_oid, &head->old_oid))
2234 return copy_ref(r);
2235 }
2236
2237 /* Look for another ref that points there */
2238 for (r = refs; r; r = r->next) {
2239 if (r != head &&
2240 starts_with(r->name, "refs/heads/") &&
2241 !oidcmp(&r->old_oid, &head->old_oid)) {
2242 *tail = copy_ref(r);
2243 tail = &((*tail)->next);
2244 if (!all)
2245 break;
2246 }
2247 }
2248
2249 return list;
2250 }
2251
2252 struct stale_heads_info {
2253 struct string_list *ref_names;
2254 struct ref **stale_refs_tail;
2255 struct refspec *refs;
2256 int ref_count;
2257 };
2258
2259 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2260 int flags, void *cb_data)
2261 {
2262 struct stale_heads_info *info = cb_data;
2263 struct string_list matches = STRING_LIST_INIT_DUP;
2264 struct refspec query;
2265 int i, stale = 1;
2266 memset(&query, 0, sizeof(struct refspec));
2267 query.dst = (char *)refname;
2268
2269 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2270 if (matches.nr == 0)
2271 goto clean_exit; /* No matches */
2272
2273 /*
2274 * If we did find a suitable refspec and it's not a symref and
2275 * it's not in the list of refs that currently exist in that
2276 * remote, we consider it to be stale. In order to deal with
2277 * overlapping refspecs, we need to go over all of the
2278 * matching refs.
2279 */
2280 if (flags & REF_ISSYMREF)
2281 goto clean_exit;
2282
2283 for (i = 0; stale && i < matches.nr; i++)
2284 if (string_list_has_string(info->ref_names, matches.items[i].string))
2285 stale = 0;
2286
2287 if (stale) {
2288 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2289 oidcpy(&ref->new_oid, oid);
2290 }
2291
2292 clean_exit:
2293 string_list_clear(&matches, 0);
2294 return 0;
2295 }
2296
2297 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2298 {
2299 struct ref *ref, *stale_refs = NULL;
2300 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2301 struct stale_heads_info info;
2302
2303 info.ref_names = &ref_names;
2304 info.stale_refs_tail = &stale_refs;
2305 info.refs = refs;
2306 info.ref_count = ref_count;
2307 for (ref = fetch_map; ref; ref = ref->next)
2308 string_list_append(&ref_names, ref->name);
2309 string_list_sort(&ref_names);
2310 for_each_ref(get_stale_heads_cb, &info);
2311 string_list_clear(&ref_names, 0);
2312 return stale_refs;
2313 }
2314
2315 /*
2316 * Compare-and-swap
2317 */
2318 static void clear_cas_option(struct push_cas_option *cas)
2319 {
2320 int i;
2321
2322 for (i = 0; i < cas->nr; i++)
2323 free(cas->entry[i].refname);
2324 free(cas->entry);
2325 memset(cas, 0, sizeof(*cas));
2326 }
2327
2328 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2329 const char *refname,
2330 size_t refnamelen)
2331 {
2332 struct push_cas *entry;
2333 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2334 entry = &cas->entry[cas->nr++];
2335 memset(entry, 0, sizeof(*entry));
2336 entry->refname = xmemdupz(refname, refnamelen);
2337 return entry;
2338 }
2339
2340 static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2341 {
2342 const char *colon;
2343 struct push_cas *entry;
2344
2345 if (unset) {
2346 /* "--no-<option>" */
2347 clear_cas_option(cas);
2348 return 0;
2349 }
2350
2351 if (!arg) {
2352 /* just "--<option>" */
2353 cas->use_tracking_for_rest = 1;
2354 return 0;
2355 }
2356
2357 /* "--<option>=refname" or "--<option>=refname:value" */
2358 colon = strchrnul(arg, ':');
2359 entry = add_cas_entry(cas, arg, colon - arg);
2360 if (!*colon)
2361 entry->use_tracking = 1;
2362 else if (!colon[1])
2363 oidclr(&entry->expect);
2364 else if (get_oid(colon + 1, &entry->expect))
2365 return error("cannot parse expected object name '%s'", colon + 1);
2366 return 0;
2367 }
2368
2369 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2370 {
2371 return parse_push_cas_option(opt->value, arg, unset);
2372 }
2373
2374 int is_empty_cas(const struct push_cas_option *cas)
2375 {
2376 return !cas->use_tracking_for_rest && !cas->nr;
2377 }
2378
2379 /*
2380 * Look at remote.fetch refspec and see if we have a remote
2381 * tracking branch for the refname there. Fill its current
2382 * value in sha1[].
2383 * If we cannot do so, return negative to signal an error.
2384 */
2385 static int remote_tracking(struct remote *remote, const char *refname,
2386 struct object_id *oid)
2387 {
2388 char *dst;
2389
2390 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2391 if (!dst)
2392 return -1; /* no tracking ref for refname at remote */
2393 if (read_ref(dst, oid))
2394 return -1; /* we know what the tracking ref is but we cannot read it */
2395 return 0;
2396 }
2397
2398 static void apply_cas(struct push_cas_option *cas,
2399 struct remote *remote,
2400 struct ref *ref)
2401 {
2402 int i;
2403
2404 /* Find an explicit --<option>=<name>[:<value>] entry */
2405 for (i = 0; i < cas->nr; i++) {
2406 struct push_cas *entry = &cas->entry[i];
2407 if (!refname_match(entry->refname, ref->name))
2408 continue;
2409 ref->expect_old_sha1 = 1;
2410 if (!entry->use_tracking)
2411 oidcpy(&ref->old_oid_expect, &entry->expect);
2412 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2413 oidclr(&ref->old_oid_expect);
2414 return;
2415 }
2416
2417 /* Are we using "--<option>" to cover all? */
2418 if (!cas->use_tracking_for_rest)
2419 return;
2420
2421 ref->expect_old_sha1 = 1;
2422 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2423 oidclr(&ref->old_oid_expect);
2424 }
2425
2426 void apply_push_cas(struct push_cas_option *cas,
2427 struct remote *remote,
2428 struct ref *remote_refs)
2429 {
2430 struct ref *ref;
2431 for (ref = remote_refs; ref; ref = ref->next)
2432 apply_cas(cas, remote, ref);
2433 }
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