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Merge branch 'ds/reachable-final-cleanup'
[git/debian.git] / remote.c
blob682f2a01f949ce942597a9190cecfc991db0108e
1 #include "cache.h"
2 #include "config.h"
3 #include "remote.h"
4 #include "refs.h"
5 #include "refspec.h"
6 #include "object-store.h"
7 #include "commit.h"
8 #include "diff.h"
9 #include "revision.h"
10 #include "dir.h"
11 #include "tag.h"
12 #include "string-list.h"
13 #include "mergesort.h"
14 #include "argv-array.h"
15 #include "commit-reach.h"
16
17 enum map_direction { FROM_SRC, FROM_DST };
18
19 struct counted_string {
20 size_t len;
21 const char *s;
22 };
23 struct rewrite {
24 const char *base;
25 size_t baselen;
26 struct counted_string *instead_of;
27 int instead_of_nr;
28 int instead_of_alloc;
29 };
30 struct rewrites {
31 struct rewrite **rewrite;
32 int rewrite_alloc;
33 int rewrite_nr;
34 };
35
36 static struct remote **remotes;
37 static int remotes_alloc;
38 static int remotes_nr;
39 static struct hashmap remotes_hash;
40
41 static struct branch **branches;
42 static int branches_alloc;
43 static int branches_nr;
44
45 static struct branch *current_branch;
46 static const char *pushremote_name;
47
48 static struct rewrites rewrites;
49 static struct rewrites rewrites_push;
50
51 static int valid_remote(const struct remote *remote)
52 {
53 return (!!remote->url) || (!!remote->foreign_vcs);
54 }
55
56 static const char *alias_url(const char *url, struct rewrites *r)
57 {
58 int i, j;
59 struct counted_string *longest;
60 int longest_i;
61
62 longest = NULL;
63 longest_i = -1;
64 for (i = 0; i < r->rewrite_nr; i++) {
65 if (!r->rewrite[i])
66 continue;
67 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
68 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
69 (!longest ||
70 longest->len < r->rewrite[i]->instead_of[j].len)) {
71 longest = &(r->rewrite[i]->instead_of[j]);
72 longest_i = i;
73 }
74 }
75 }
76 if (!longest)
77 return url;
78
79 return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
80 }
81
82 static void add_url(struct remote *remote, const char *url)
83 {
84 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
85 remote->url[remote->url_nr++] = url;
86 }
87
88 static void add_pushurl(struct remote *remote, const char *pushurl)
89 {
90 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
91 remote->pushurl[remote->pushurl_nr++] = pushurl;
92 }
93
94 static void add_pushurl_alias(struct remote *remote, const char *url)
95 {
96 const char *pushurl = alias_url(url, &rewrites_push);
97 if (pushurl != url)
98 add_pushurl(remote, pushurl);
99 }
100
101 static void add_url_alias(struct remote *remote, const char *url)
102 {
103 add_url(remote, alias_url(url, &rewrites));
104 add_pushurl_alias(remote, url);
105 }
106
107 struct remotes_hash_key {
108 const char *str;
109 int len;
110 };
111
112 static int remotes_hash_cmp(const void *unused_cmp_data,
113 const void *entry,
114 const void *entry_or_key,
115 const void *keydata)
116 {
117 const struct remote *a = entry;
118 const struct remote *b = entry_or_key;
119 const struct remotes_hash_key *key = keydata;
120
121 if (key)
122 return strncmp(a->name, key->str, key->len) || a->name[key->len];
123 else
124 return strcmp(a->name, b->name);
125 }
126
127 static inline void init_remotes_hash(void)
128 {
129 if (!remotes_hash.cmpfn)
130 hashmap_init(&remotes_hash, remotes_hash_cmp, NULL, 0);
131 }
132
133 static struct remote *make_remote(const char *name, int len)
134 {
135 struct remote *ret, *replaced;
136 struct remotes_hash_key lookup;
137 struct hashmap_entry lookup_entry;
138
139 if (!len)
140 len = strlen(name);
141
142 init_remotes_hash();
143 lookup.str = name;
144 lookup.len = len;
145 hashmap_entry_init(&lookup_entry, memhash(name, len));
146
147 if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
148 return ret;
149
150 ret = xcalloc(1, sizeof(struct remote));
151 ret->prune = -1; /* unspecified */
152 ret->prune_tags = -1; /* unspecified */
153 ret->name = xstrndup(name, len);
154 refspec_init(&ret->push, REFSPEC_PUSH);
155 refspec_init(&ret->fetch, REFSPEC_FETCH);
156
157 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
158 remotes[remotes_nr++] = ret;
159
160 hashmap_entry_init(ret, lookup_entry.hash);
161 replaced = hashmap_put(&remotes_hash, ret);
162 assert(replaced == NULL); /* no previous entry overwritten */
163 return ret;
164 }
165
166 static void add_merge(struct branch *branch, const char *name)
167 {
168 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
169 branch->merge_alloc);
170 branch->merge_name[branch->merge_nr++] = name;
171 }
172
173 static struct branch *make_branch(const char *name, int len)
174 {
175 struct branch *ret;
176 int i;
177
178 for (i = 0; i < branches_nr; i++) {
179 if (len ? (!strncmp(name, branches[i]->name, len) &&
180 !branches[i]->name[len]) :
181 !strcmp(name, branches[i]->name))
182 return branches[i];
183 }
184
185 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
186 ret = xcalloc(1, sizeof(struct branch));
187 branches[branches_nr++] = ret;
188 if (len)
189 ret->name = xstrndup(name, len);
190 else
191 ret->name = xstrdup(name);
192 ret->refname = xstrfmt("refs/heads/%s", ret->name);
193
194 return ret;
195 }
196
197 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
198 {
199 struct rewrite *ret;
200 int i;
201
202 for (i = 0; i < r->rewrite_nr; i++) {
203 if (len
204 ? (len == r->rewrite[i]->baselen &&
205 !strncmp(base, r->rewrite[i]->base, len))
206 : !strcmp(base, r->rewrite[i]->base))
207 return r->rewrite[i];
208 }
209
210 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
211 ret = xcalloc(1, sizeof(struct rewrite));
212 r->rewrite[r->rewrite_nr++] = ret;
213 if (len) {
214 ret->base = xstrndup(base, len);
215 ret->baselen = len;
216 }
217 else {
218 ret->base = xstrdup(base);
219 ret->baselen = strlen(base);
220 }
221 return ret;
222 }
223
224 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
225 {
226 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
227 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
228 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
229 rewrite->instead_of_nr++;
230 }
231
232 static const char *skip_spaces(const char *s)
233 {
234 while (isspace(*s))
235 s++;
236 return s;
237 }
238
239 static void read_remotes_file(struct remote *remote)
240 {
241 struct strbuf buf = STRBUF_INIT;
242 FILE *f = fopen_or_warn(git_path("remotes/%s", remote->name), "r");
243
244 if (!f)
245 return;
246 remote->configured_in_repo = 1;
247 remote->origin = REMOTE_REMOTES;
248 while (strbuf_getline(&buf, f) != EOF) {
249 const char *v;
250
251 strbuf_rtrim(&buf);
252
253 if (skip_prefix(buf.buf, "URL:", &v))
254 add_url_alias(remote, xstrdup(skip_spaces(v)));
255 else if (skip_prefix(buf.buf, "Push:", &v))
256 refspec_append(&remote->push, skip_spaces(v));
257 else if (skip_prefix(buf.buf, "Pull:", &v))
258 refspec_append(&remote->fetch, skip_spaces(v));
259 }
260 strbuf_release(&buf);
261 fclose(f);
262 }
263
264 static void read_branches_file(struct remote *remote)
265 {
266 char *frag;
267 struct strbuf buf = STRBUF_INIT;
268 FILE *f = fopen_or_warn(git_path("branches/%s", remote->name), "r");
269
270 if (!f)
271 return;
272
273 strbuf_getline_lf(&buf, f);
274 fclose(f);
275 strbuf_trim(&buf);
276 if (!buf.len) {
277 strbuf_release(&buf);
278 return;
279 }
280
281 remote->configured_in_repo = 1;
282 remote->origin = REMOTE_BRANCHES;
283
284 /*
285 * The branches file would have URL and optionally
286 * #branch specified. The "master" (or specified) branch is
287 * fetched and stored in the local branch matching the
288 * remote name.
289 */
290 frag = strchr(buf.buf, '#');
291 if (frag)
292 *(frag++) = '\0';
293 else
294 frag = "master";
295
296 add_url_alias(remote, strbuf_detach(&buf, NULL));
297 strbuf_addf(&buf, "refs/heads/%s:refs/heads/%s",
298 frag, remote->name);
299 refspec_append(&remote->fetch, buf.buf);
300
301 /*
302 * Cogito compatible push: push current HEAD to remote #branch
303 * (master if missing)
304 */
305 strbuf_reset(&buf);
306 strbuf_addf(&buf, "HEAD:refs/heads/%s", frag);
307 refspec_append(&remote->push, buf.buf);
308 remote->fetch_tags = 1; /* always auto-follow */
309 strbuf_release(&buf);
310 }
311
312 static int handle_config(const char *key, const char *value, void *cb)
313 {
314 const char *name;
315 int namelen;
316 const char *subkey;
317 struct remote *remote;
318 struct branch *branch;
319 if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
320 if (!name)
321 return 0;
322 branch = make_branch(name, namelen);
323 if (!strcmp(subkey, "remote")) {
324 return git_config_string(&branch->remote_name, key, value);
325 } else if (!strcmp(subkey, "pushremote")) {
326 return git_config_string(&branch->pushremote_name, key, value);
327 } else if (!strcmp(subkey, "merge")) {
328 if (!value)
329 return config_error_nonbool(key);
330 add_merge(branch, xstrdup(value));
331 }
332 return 0;
333 }
334 if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
335 struct rewrite *rewrite;
336 if (!name)
337 return 0;
338 if (!strcmp(subkey, "insteadof")) {
339 rewrite = make_rewrite(&rewrites, name, namelen);
340 if (!value)
341 return config_error_nonbool(key);
342 add_instead_of(rewrite, xstrdup(value));
343 } else if (!strcmp(subkey, "pushinsteadof")) {
344 rewrite = make_rewrite(&rewrites_push, name, namelen);
345 if (!value)
346 return config_error_nonbool(key);
347 add_instead_of(rewrite, xstrdup(value));
348 }
349 }
350
351 if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
352 return 0;
353
354 /* Handle remote.* variables */
355 if (!name && !strcmp(subkey, "pushdefault"))
356 return git_config_string(&pushremote_name, key, value);
357
358 if (!name)
359 return 0;
360 /* Handle remote.<name>.* variables */
361 if (*name == '/') {
362 warning("Config remote shorthand cannot begin with '/': %s",
363 name);
364 return 0;
365 }
366 remote = make_remote(name, namelen);
367 remote->origin = REMOTE_CONFIG;
368 if (current_config_scope() == CONFIG_SCOPE_REPO)
369 remote->configured_in_repo = 1;
370 if (!strcmp(subkey, "mirror"))
371 remote->mirror = git_config_bool(key, value);
372 else if (!strcmp(subkey, "skipdefaultupdate"))
373 remote->skip_default_update = git_config_bool(key, value);
374 else if (!strcmp(subkey, "skipfetchall"))
375 remote->skip_default_update = git_config_bool(key, value);
376 else if (!strcmp(subkey, "prune"))
377 remote->prune = git_config_bool(key, value);
378 else if (!strcmp(subkey, "prunetags"))
379 remote->prune_tags = git_config_bool(key, value);
380 else if (!strcmp(subkey, "url")) {
381 const char *v;
382 if (git_config_string(&v, key, value))
383 return -1;
384 add_url(remote, v);
385 } else if (!strcmp(subkey, "pushurl")) {
386 const char *v;
387 if (git_config_string(&v, key, value))
388 return -1;
389 add_pushurl(remote, v);
390 } else if (!strcmp(subkey, "push")) {
391 const char *v;
392 if (git_config_string(&v, key, value))
393 return -1;
394 refspec_append(&remote->push, v);
395 free((char *)v);
396 } else if (!strcmp(subkey, "fetch")) {
397 const char *v;
398 if (git_config_string(&v, key, value))
399 return -1;
400 refspec_append(&remote->fetch, v);
401 free((char *)v);
402 } else if (!strcmp(subkey, "receivepack")) {
403 const char *v;
404 if (git_config_string(&v, key, value))
405 return -1;
406 if (!remote->receivepack)
407 remote->receivepack = v;
408 else
409 error("more than one receivepack given, using the first");
410 } else if (!strcmp(subkey, "uploadpack")) {
411 const char *v;
412 if (git_config_string(&v, key, value))
413 return -1;
414 if (!remote->uploadpack)
415 remote->uploadpack = v;
416 else
417 error("more than one uploadpack given, using the first");
418 } else if (!strcmp(subkey, "tagopt")) {
419 if (!strcmp(value, "--no-tags"))
420 remote->fetch_tags = -1;
421 else if (!strcmp(value, "--tags"))
422 remote->fetch_tags = 2;
423 } else if (!strcmp(subkey, "proxy")) {
424 return git_config_string((const char **)&remote->http_proxy,
425 key, value);
426 } else if (!strcmp(subkey, "proxyauthmethod")) {
427 return git_config_string((const char **)&remote->http_proxy_authmethod,
428 key, value);
429 } else if (!strcmp(subkey, "vcs")) {
430 return git_config_string(&remote->foreign_vcs, key, value);
431 }
432 return 0;
433 }
434
435 static void alias_all_urls(void)
436 {
437 int i, j;
438 for (i = 0; i < remotes_nr; i++) {
439 int add_pushurl_aliases;
440 if (!remotes[i])
441 continue;
442 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
443 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
444 }
445 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
446 for (j = 0; j < remotes[i]->url_nr; j++) {
447 if (add_pushurl_aliases)
448 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
449 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
450 }
451 }
452 }
453
454 static void read_config(void)
455 {
456 static int loaded;
457 int flag;
458
459 if (loaded)
460 return;
461 loaded = 1;
462
463 current_branch = NULL;
464 if (startup_info->have_repository) {
465 const char *head_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flag);
466 if (head_ref && (flag & REF_ISSYMREF) &&
467 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
468 current_branch = make_branch(head_ref, 0);
469 }
470 }
471 git_config(handle_config, NULL);
472 alias_all_urls();
473 }
474
475 static int valid_remote_nick(const char *name)
476 {
477 if (!name[0] || is_dot_or_dotdot(name))
478 return 0;
479
480 /* remote nicknames cannot contain slashes */
481 while (*name)
482 if (is_dir_sep(*name++))
483 return 0;
484 return 1;
485 }
486
487 const char *remote_for_branch(struct branch *branch, int *explicit)
488 {
489 if (branch && branch->remote_name) {
490 if (explicit)
491 *explicit = 1;
492 return branch->remote_name;
493 }
494 if (explicit)
495 *explicit = 0;
496 return "origin";
497 }
498
499 const char *pushremote_for_branch(struct branch *branch, int *explicit)
500 {
501 if (branch && branch->pushremote_name) {
502 if (explicit)
503 *explicit = 1;
504 return branch->pushremote_name;
505 }
506 if (pushremote_name) {
507 if (explicit)
508 *explicit = 1;
509 return pushremote_name;
510 }
511 return remote_for_branch(branch, explicit);
512 }
513
514 const char *remote_ref_for_branch(struct branch *branch, int for_push,
515 int *explicit)
516 {
517 if (branch) {
518 if (!for_push) {
519 if (branch->merge_nr) {
520 if (explicit)
521 *explicit = 1;
522 return branch->merge_name[0];
523 }
524 } else {
525 const char *dst, *remote_name =
526 pushremote_for_branch(branch, NULL);
527 struct remote *remote = remote_get(remote_name);
528
529 if (remote && remote->push.nr &&
530 (dst = apply_refspecs(&remote->push,
531 branch->refname))) {
532 if (explicit)
533 *explicit = 1;
534 return dst;
535 }
536 }
537 }
538 if (explicit)
539 *explicit = 0;
540 return "";
541 }
542
543 static struct remote *remote_get_1(const char *name,
544 const char *(*get_default)(struct branch *, int *))
545 {
546 struct remote *ret;
547 int name_given = 0;
548
549 read_config();
550
551 if (name)
552 name_given = 1;
553 else
554 name = get_default(current_branch, &name_given);
555
556 ret = make_remote(name, 0);
557 if (valid_remote_nick(name) && have_git_dir()) {
558 if (!valid_remote(ret))
559 read_remotes_file(ret);
560 if (!valid_remote(ret))
561 read_branches_file(ret);
562 }
563 if (name_given && !valid_remote(ret))
564 add_url_alias(ret, name);
565 if (!valid_remote(ret))
566 return NULL;
567 return ret;
568 }
569
570 struct remote *remote_get(const char *name)
571 {
572 return remote_get_1(name, remote_for_branch);
573 }
574
575 struct remote *pushremote_get(const char *name)
576 {
577 return remote_get_1(name, pushremote_for_branch);
578 }
579
580 int remote_is_configured(struct remote *remote, int in_repo)
581 {
582 if (!remote)
583 return 0;
584 if (in_repo)
585 return remote->configured_in_repo;
586 return !!remote->origin;
587 }
588
589 int for_each_remote(each_remote_fn fn, void *priv)
590 {
591 int i, result = 0;
592 read_config();
593 for (i = 0; i < remotes_nr && !result; i++) {
594 struct remote *r = remotes[i];
595 if (!r)
596 continue;
597 result = fn(r, priv);
598 }
599 return result;
600 }
601
602 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
603 {
604 if (strcmp(ref1->name, ref2->name)) {
605 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
606 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
607 die(_("Cannot fetch both %s and %s to %s"),
608 ref1->name, ref2->name, ref2->peer_ref->name);
609 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
610 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
611 warning(_("%s usually tracks %s, not %s"),
612 ref2->peer_ref->name, ref2->name, ref1->name);
613 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
614 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
615 die(_("%s tracks both %s and %s"),
616 ref2->peer_ref->name, ref1->name, ref2->name);
617 } else {
618 /*
619 * This last possibility doesn't occur because
620 * FETCH_HEAD_IGNORE entries always appear at
621 * the end of the list.
622 */
623 die(_("Internal error"));
624 }
625 }
626 free(ref2->peer_ref);
627 free(ref2);
628 }
629
630 struct ref *ref_remove_duplicates(struct ref *ref_map)
631 {
632 struct string_list refs = STRING_LIST_INIT_NODUP;
633 struct ref *retval = NULL;
634 struct ref **p = &retval;
635
636 while (ref_map) {
637 struct ref *ref = ref_map;
638
639 ref_map = ref_map->next;
640 ref->next = NULL;
641
642 if (!ref->peer_ref) {
643 *p = ref;
644 p = &ref->next;
645 } else {
646 struct string_list_item *item =
647 string_list_insert(&refs, ref->peer_ref->name);
648
649 if (item->util) {
650 /* Entry already existed */
651 handle_duplicate((struct ref *)item->util, ref);
652 } else {
653 *p = ref;
654 p = &ref->next;
655 item->util = ref;
656 }
657 }
658 }
659
660 string_list_clear(&refs, 0);
661 return retval;
662 }
663
664 int remote_has_url(struct remote *remote, const char *url)
665 {
666 int i;
667 for (i = 0; i < remote->url_nr; i++) {
668 if (!strcmp(remote->url[i], url))
669 return 1;
670 }
671 return 0;
672 }
673
674 static int match_name_with_pattern(const char *key, const char *name,
675 const char *value, char **result)
676 {
677 const char *kstar = strchr(key, '*');
678 size_t klen;
679 size_t ksuffixlen;
680 size_t namelen;
681 int ret;
682 if (!kstar)
683 die("Key '%s' of pattern had no '*'", key);
684 klen = kstar - key;
685 ksuffixlen = strlen(kstar + 1);
686 namelen = strlen(name);
687 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
688 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
689 if (ret && value) {
690 struct strbuf sb = STRBUF_INIT;
691 const char *vstar = strchr(value, '*');
692 if (!vstar)
693 die("Value '%s' of pattern has no '*'", value);
694 strbuf_add(&sb, value, vstar - value);
695 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
696 strbuf_addstr(&sb, vstar + 1);
697 *result = strbuf_detach(&sb, NULL);
698 }
699 return ret;
700 }
701
702 static void query_refspecs_multiple(struct refspec *rs,
703 struct refspec_item *query,
704 struct string_list *results)
705 {
706 int i;
707 int find_src = !query->src;
708
709 if (find_src && !query->dst)
710 error("query_refspecs_multiple: need either src or dst");
711
712 for (i = 0; i < rs->nr; i++) {
713 struct refspec_item *refspec = &rs->items[i];
714 const char *key = find_src ? refspec->dst : refspec->src;
715 const char *value = find_src ? refspec->src : refspec->dst;
716 const char *needle = find_src ? query->dst : query->src;
717 char **result = find_src ? &query->src : &query->dst;
718
719 if (!refspec->dst)
720 continue;
721 if (refspec->pattern) {
722 if (match_name_with_pattern(key, needle, value, result))
723 string_list_append_nodup(results, *result);
724 } else if (!strcmp(needle, key)) {
725 string_list_append(results, value);
726 }
727 }
728 }
729
730 int query_refspecs(struct refspec *rs, struct refspec_item *query)
731 {
732 int i;
733 int find_src = !query->src;
734 const char *needle = find_src ? query->dst : query->src;
735 char **result = find_src ? &query->src : &query->dst;
736
737 if (find_src && !query->dst)
738 return error("query_refspecs: need either src or dst");
739
740 for (i = 0; i < rs->nr; i++) {
741 struct refspec_item *refspec = &rs->items[i];
742 const char *key = find_src ? refspec->dst : refspec->src;
743 const char *value = find_src ? refspec->src : refspec->dst;
744
745 if (!refspec->dst)
746 continue;
747 if (refspec->pattern) {
748 if (match_name_with_pattern(key, needle, value, result)) {
749 query->force = refspec->force;
750 return 0;
751 }
752 } else if (!strcmp(needle, key)) {
753 *result = xstrdup(value);
754 query->force = refspec->force;
755 return 0;
756 }
757 }
758 return -1;
759 }
760
761 char *apply_refspecs(struct refspec *rs, const char *name)
762 {
763 struct refspec_item query;
764
765 memset(&query, 0, sizeof(struct refspec_item));
766 query.src = (char *)name;
767
768 if (query_refspecs(rs, &query))
769 return NULL;
770
771 return query.dst;
772 }
773
774 int remote_find_tracking(struct remote *remote, struct refspec_item *refspec)
775 {
776 return query_refspecs(&remote->fetch, refspec);
777 }
778
779 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
780 const char *name)
781 {
782 size_t len = strlen(name);
783 struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
784 memcpy(ref->name, prefix, prefixlen);
785 memcpy(ref->name + prefixlen, name, len);
786 return ref;
787 }
788
789 struct ref *alloc_ref(const char *name)
790 {
791 return alloc_ref_with_prefix("", 0, name);
792 }
793
794 struct ref *copy_ref(const struct ref *ref)
795 {
796 struct ref *cpy;
797 size_t len;
798 if (!ref)
799 return NULL;
800 len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
801 cpy = xmalloc(len);
802 memcpy(cpy, ref, len);
803 cpy->next = NULL;
804 cpy->symref = xstrdup_or_null(ref->symref);
805 cpy->remote_status = xstrdup_or_null(ref->remote_status);
806 cpy->peer_ref = copy_ref(ref->peer_ref);
807 return cpy;
808 }
809
810 struct ref *copy_ref_list(const struct ref *ref)
811 {
812 struct ref *ret = NULL;
813 struct ref **tail = &ret;
814 while (ref) {
815 *tail = copy_ref(ref);
816 ref = ref->next;
817 tail = &((*tail)->next);
818 }
819 return ret;
820 }
821
822 static void free_ref(struct ref *ref)
823 {
824 if (!ref)
825 return;
826 free_ref(ref->peer_ref);
827 free(ref->remote_status);
828 free(ref->symref);
829 free(ref);
830 }
831
832 void free_refs(struct ref *ref)
833 {
834 struct ref *next;
835 while (ref) {
836 next = ref->next;
837 free_ref(ref);
838 ref = next;
839 }
840 }
841
842 int ref_compare_name(const void *va, const void *vb)
843 {
844 const struct ref *a = va, *b = vb;
845 return strcmp(a->name, b->name);
846 }
847
848 static void *ref_list_get_next(const void *a)
849 {
850 return ((const struct ref *)a)->next;
851 }
852
853 static void ref_list_set_next(void *a, void *next)
854 {
855 ((struct ref *)a)->next = next;
856 }
857
858 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
859 {
860 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
861 }
862
863 int count_refspec_match(const char *pattern,
864 struct ref *refs,
865 struct ref **matched_ref)
866 {
867 int patlen = strlen(pattern);
868 struct ref *matched_weak = NULL;
869 struct ref *matched = NULL;
870 int weak_match = 0;
871 int match = 0;
872
873 for (weak_match = match = 0; refs; refs = refs->next) {
874 char *name = refs->name;
875 int namelen = strlen(name);
876
877 if (!refname_match(pattern, name))
878 continue;
879
880 /* A match is "weak" if it is with refs outside
881 * heads or tags, and did not specify the pattern
882 * in full (e.g. "refs/remotes/origin/master") or at
883 * least from the toplevel (e.g. "remotes/origin/master");
884 * otherwise "git push $URL master" would result in
885 * ambiguity between remotes/origin/master and heads/master
886 * at the remote site.
887 */
888 if (namelen != patlen &&
889 patlen != namelen - 5 &&
890 !starts_with(name, "refs/heads/") &&
891 !starts_with(name, "refs/tags/")) {
892 /* We want to catch the case where only weak
893 * matches are found and there are multiple
894 * matches, and where more than one strong
895 * matches are found, as ambiguous. One
896 * strong match with zero or more weak matches
897 * are acceptable as a unique match.
898 */
899 matched_weak = refs;
900 weak_match++;
901 }
902 else {
903 matched = refs;
904 match++;
905 }
906 }
907 if (!matched) {
908 if (matched_ref)
909 *matched_ref = matched_weak;
910 return weak_match;
911 }
912 else {
913 if (matched_ref)
914 *matched_ref = matched;
915 return match;
916 }
917 }
918
919 static void tail_link_ref(struct ref *ref, struct ref ***tail)
920 {
921 **tail = ref;
922 while (ref->next)
923 ref = ref->next;
924 *tail = &ref->next;
925 }
926
927 static struct ref *alloc_delete_ref(void)
928 {
929 struct ref *ref = alloc_ref("(delete)");
930 oidclr(&ref->new_oid);
931 return ref;
932 }
933
934 static int try_explicit_object_name(const char *name,
935 struct ref **match)
936 {
937 struct object_id oid;
938
939 if (!*name) {
940 if (match)
941 *match = alloc_delete_ref();
942 return 0;
943 }
944
945 if (get_oid(name, &oid))
946 return -1;
947
948 if (match) {
949 *match = alloc_ref(name);
950 oidcpy(&(*match)->new_oid, &oid);
951 }
952 return 0;
953 }
954
955 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
956 {
957 struct ref *ret = alloc_ref(name);
958 tail_link_ref(ret, tail);
959 return ret;
960 }
961
962 static char *guess_ref(const char *name, struct ref *peer)
963 {
964 struct strbuf buf = STRBUF_INIT;
965
966 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
967 NULL, NULL);
968 if (!r)
969 return NULL;
970
971 if (starts_with(r, "refs/heads/"))
972 strbuf_addstr(&buf, "refs/heads/");
973 else if (starts_with(r, "refs/tags/"))
974 strbuf_addstr(&buf, "refs/tags/");
975 else
976 return NULL;
977
978 strbuf_addstr(&buf, name);
979 return strbuf_detach(&buf, NULL);
980 }
981
982 static int match_explicit_lhs(struct ref *src,
983 struct refspec_item *rs,
984 struct ref **match,
985 int *allocated_match)
986 {
987 switch (count_refspec_match(rs->src, src, match)) {
988 case 1:
989 if (allocated_match)
990 *allocated_match = 0;
991 return 0;
992 case 0:
993 /* The source could be in the get_sha1() format
994 * not a reference name. :refs/other is a
995 * way to delete 'other' ref at the remote end.
996 */
997 if (try_explicit_object_name(rs->src, match) < 0)
998 return error("src refspec %s does not match any.", rs->src);
999 if (allocated_match)
1000 *allocated_match = 1;
1001 return 0;
1002 default:
1003 return error("src refspec %s matches more than one.", rs->src);
1004 }
1005 }
1006
1007 static int match_explicit(struct ref *src, struct ref *dst,
1008 struct ref ***dst_tail,
1009 struct refspec_item *rs)
1010 {
1011 struct ref *matched_src, *matched_dst;
1012 int allocated_src;
1013
1014 const char *dst_value = rs->dst;
1015 char *dst_guess;
1016
1017 if (rs->pattern || rs->matching)
1018 return 0;
1019
1020 matched_src = matched_dst = NULL;
1021 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1022 return -1;
1023
1024 if (!dst_value) {
1025 int flag;
1026
1027 dst_value = resolve_ref_unsafe(matched_src->name,
1028 RESOLVE_REF_READING,
1029 NULL, &flag);
1030 if (!dst_value ||
1031 ((flag & REF_ISSYMREF) &&
1032 !starts_with(dst_value, "refs/heads/")))
1033 die("%s cannot be resolved to branch.",
1034 matched_src->name);
1035 }
1036
1037 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1038 case 1:
1039 break;
1040 case 0:
1041 if (starts_with(dst_value, "refs/"))
1042 matched_dst = make_linked_ref(dst_value, dst_tail);
1043 else if (is_null_oid(&matched_src->new_oid))
1044 error("unable to delete '%s': remote ref does not exist",
1045 dst_value);
1046 else if ((dst_guess = guess_ref(dst_value, matched_src))) {
1047 matched_dst = make_linked_ref(dst_guess, dst_tail);
1048 free(dst_guess);
1049 } else
1050 error("unable to push to unqualified destination: %s\n"
1051 "The destination refspec neither matches an "
1052 "existing ref on the remote nor\n"
1053 "begins with refs/, and we are unable to "
1054 "guess a prefix based on the source ref.",
1055 dst_value);
1056 break;
1057 default:
1058 matched_dst = NULL;
1059 error("dst refspec %s matches more than one.",
1060 dst_value);
1061 break;
1062 }
1063 if (!matched_dst)
1064 return -1;
1065 if (matched_dst->peer_ref)
1066 return error("dst ref %s receives from more than one src.",
1067 matched_dst->name);
1068 else {
1069 matched_dst->peer_ref = allocated_src ?
1070 matched_src :
1071 copy_ref(matched_src);
1072 matched_dst->force = rs->force;
1073 }
1074 return 0;
1075 }
1076
1077 static int match_explicit_refs(struct ref *src, struct ref *dst,
1078 struct ref ***dst_tail, struct refspec *rs)
1079 {
1080 int i, errs;
1081 for (i = errs = 0; i < rs->nr; i++)
1082 errs += match_explicit(src, dst, dst_tail, &rs->items[i]);
1083 return errs;
1084 }
1085
1086 static char *get_ref_match(const struct refspec *rs, const struct ref *ref,
1087 int send_mirror, int direction,
1088 const struct refspec_item **ret_pat)
1089 {
1090 const struct refspec_item *pat;
1091 char *name;
1092 int i;
1093 int matching_refs = -1;
1094 for (i = 0; i < rs->nr; i++) {
1095 const struct refspec_item *item = &rs->items[i];
1096 if (item->matching &&
1097 (matching_refs == -1 || item->force)) {
1098 matching_refs = i;
1099 continue;
1100 }
1101
1102 if (item->pattern) {
1103 const char *dst_side = item->dst ? item->dst : item->src;
1104 int match;
1105 if (direction == FROM_SRC)
1106 match = match_name_with_pattern(item->src, ref->name, dst_side, &name);
1107 else
1108 match = match_name_with_pattern(dst_side, ref->name, item->src, &name);
1109 if (match) {
1110 matching_refs = i;
1111 break;
1112 }
1113 }
1114 }
1115 if (matching_refs == -1)
1116 return NULL;
1117
1118 pat = &rs->items[matching_refs];
1119 if (pat->matching) {
1120 /*
1121 * "matching refs"; traditionally we pushed everything
1122 * including refs outside refs/heads/ hierarchy, but
1123 * that does not make much sense these days.
1124 */
1125 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1126 return NULL;
1127 name = xstrdup(ref->name);
1128 }
1129 if (ret_pat)
1130 *ret_pat = pat;
1131 return name;
1132 }
1133
1134 static struct ref **tail_ref(struct ref **head)
1135 {
1136 struct ref **tail = head;
1137 while (*tail)
1138 tail = &((*tail)->next);
1139 return tail;
1140 }
1141
1142 struct tips {
1143 struct commit **tip;
1144 int nr, alloc;
1145 };
1146
1147 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1148 {
1149 struct commit *commit;
1150
1151 if (is_null_oid(oid))
1152 return;
1153 commit = lookup_commit_reference_gently(the_repository, oid, 1);
1154 if (!commit || (commit->object.flags & TMP_MARK))
1155 return;
1156 commit->object.flags |= TMP_MARK;
1157 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1158 tips->tip[tips->nr++] = commit;
1159 }
1160
1161 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1162 {
1163 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1164 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1165 struct string_list_item *item;
1166 struct ref *ref;
1167 struct tips sent_tips;
1168
1169 /*
1170 * Collect everything we know they would have at the end of
1171 * this push, and collect all tags they have.
1172 */
1173 memset(&sent_tips, 0, sizeof(sent_tips));
1174 for (ref = *dst; ref; ref = ref->next) {
1175 if (ref->peer_ref &&
1176 !is_null_oid(&ref->peer_ref->new_oid))
1177 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1178 else
1179 add_to_tips(&sent_tips, &ref->old_oid);
1180 if (starts_with(ref->name, "refs/tags/"))
1181 string_list_append(&dst_tag, ref->name);
1182 }
1183 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1184
1185 string_list_sort(&dst_tag);
1186
1187 /* Collect tags they do not have. */
1188 for (ref = src; ref; ref = ref->next) {
1189 if (!starts_with(ref->name, "refs/tags/"))
1190 continue; /* not a tag */
1191 if (string_list_has_string(&dst_tag, ref->name))
1192 continue; /* they already have it */
1193 if (oid_object_info(the_repository, &ref->new_oid, NULL) != OBJ_TAG)
1194 continue; /* be conservative */
1195 item = string_list_append(&src_tag, ref->name);
1196 item->util = ref;
1197 }
1198 string_list_clear(&dst_tag, 0);
1199
1200 /*
1201 * At this point, src_tag lists tags that are missing from
1202 * dst, and sent_tips lists the tips we are pushing or those
1203 * that we know they already have. An element in the src_tag
1204 * that is an ancestor of any of the sent_tips needs to be
1205 * sent to the other side.
1206 */
1207 if (sent_tips.nr) {
1208 for_each_string_list_item(item, &src_tag) {
1209 struct ref *ref = item->util;
1210 struct ref *dst_ref;
1211 struct commit *commit;
1212
1213 if (is_null_oid(&ref->new_oid))
1214 continue;
1215 commit = lookup_commit_reference_gently(the_repository,
1216 &ref->new_oid,
1217 1);
1218 if (!commit)
1219 /* not pushing a commit, which is not an error */
1220 continue;
1221
1222 /*
1223 * Is this tag, which they do not have, reachable from
1224 * any of the commits we are sending?
1225 */
1226 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1227 continue;
1228
1229 /* Add it in */
1230 dst_ref = make_linked_ref(ref->name, dst_tail);
1231 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1232 dst_ref->peer_ref = copy_ref(ref);
1233 }
1234 }
1235 string_list_clear(&src_tag, 0);
1236 free(sent_tips.tip);
1237 }
1238
1239 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1240 {
1241 for ( ; list; list = list->next)
1242 if (!strcmp(list->name, name))
1243 return (struct ref *)list;
1244 return NULL;
1245 }
1246
1247 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1248 {
1249 for ( ; ref; ref = ref->next)
1250 string_list_append_nodup(ref_index, ref->name)->util = ref;
1251
1252 string_list_sort(ref_index);
1253 }
1254
1255 /*
1256 * Given only the set of local refs, sanity-check the set of push
1257 * refspecs. We can't catch all errors that match_push_refs would,
1258 * but we can catch some errors early before even talking to the
1259 * remote side.
1260 */
1261 int check_push_refs(struct ref *src, struct refspec *rs)
1262 {
1263 int ret = 0;
1264 int i;
1265
1266 for (i = 0; i < rs->nr; i++) {
1267 struct refspec_item *item = &rs->items[i];
1268
1269 if (item->pattern || item->matching)
1270 continue;
1271
1272 ret |= match_explicit_lhs(src, item, NULL, NULL);
1273 }
1274
1275 return ret;
1276 }
1277
1278 /*
1279 * Given the set of refs the local repository has, the set of refs the
1280 * remote repository has, and the refspec used for push, determine
1281 * what remote refs we will update and with what value by setting
1282 * peer_ref (which object is being pushed) and force (if the push is
1283 * forced) in elements of "dst". The function may add new elements to
1284 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1285 */
1286 int match_push_refs(struct ref *src, struct ref **dst,
1287 struct refspec *rs, int flags)
1288 {
1289 int send_all = flags & MATCH_REFS_ALL;
1290 int send_mirror = flags & MATCH_REFS_MIRROR;
1291 int send_prune = flags & MATCH_REFS_PRUNE;
1292 int errs;
1293 struct ref *ref, **dst_tail = tail_ref(dst);
1294 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1295
1296 /* If no refspec is provided, use the default ":" */
1297 if (!rs->nr)
1298 refspec_append(rs, ":");
1299
1300 errs = match_explicit_refs(src, *dst, &dst_tail, rs);
1301
1302 /* pick the remainder */
1303 for (ref = src; ref; ref = ref->next) {
1304 struct string_list_item *dst_item;
1305 struct ref *dst_peer;
1306 const struct refspec_item *pat = NULL;
1307 char *dst_name;
1308
1309 dst_name = get_ref_match(rs, ref, send_mirror, FROM_SRC, &pat);
1310 if (!dst_name)
1311 continue;
1312
1313 if (!dst_ref_index.nr)
1314 prepare_ref_index(&dst_ref_index, *dst);
1315
1316 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1317 dst_peer = dst_item ? dst_item->util : NULL;
1318 if (dst_peer) {
1319 if (dst_peer->peer_ref)
1320 /* We're already sending something to this ref. */
1321 goto free_name;
1322 } else {
1323 if (pat->matching && !(send_all || send_mirror))
1324 /*
1325 * Remote doesn't have it, and we have no
1326 * explicit pattern, and we don't have
1327 * --all or --mirror.
1328 */
1329 goto free_name;
1330
1331 /* Create a new one and link it */
1332 dst_peer = make_linked_ref(dst_name, &dst_tail);
1333 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1334 string_list_insert(&dst_ref_index,
1335 dst_peer->name)->util = dst_peer;
1336 }
1337 dst_peer->peer_ref = copy_ref(ref);
1338 dst_peer->force = pat->force;
1339 free_name:
1340 free(dst_name);
1341 }
1342
1343 string_list_clear(&dst_ref_index, 0);
1344
1345 if (flags & MATCH_REFS_FOLLOW_TAGS)
1346 add_missing_tags(src, dst, &dst_tail);
1347
1348 if (send_prune) {
1349 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1350 /* check for missing refs on the remote */
1351 for (ref = *dst; ref; ref = ref->next) {
1352 char *src_name;
1353
1354 if (ref->peer_ref)
1355 /* We're already sending something to this ref. */
1356 continue;
1357
1358 src_name = get_ref_match(rs, ref, send_mirror, FROM_DST, NULL);
1359 if (src_name) {
1360 if (!src_ref_index.nr)
1361 prepare_ref_index(&src_ref_index, src);
1362 if (!string_list_has_string(&src_ref_index,
1363 src_name))
1364 ref->peer_ref = alloc_delete_ref();
1365 free(src_name);
1366 }
1367 }
1368 string_list_clear(&src_ref_index, 0);
1369 }
1370
1371 if (errs)
1372 return -1;
1373 return 0;
1374 }
1375
1376 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1377 int force_update)
1378 {
1379 struct ref *ref;
1380
1381 for (ref = remote_refs; ref; ref = ref->next) {
1382 int force_ref_update = ref->force || force_update;
1383 int reject_reason = 0;
1384
1385 if (ref->peer_ref)
1386 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1387 else if (!send_mirror)
1388 continue;
1389
1390 ref->deletion = is_null_oid(&ref->new_oid);
1391 if (!ref->deletion &&
1392 oideq(&ref->old_oid, &ref->new_oid)) {
1393 ref->status = REF_STATUS_UPTODATE;
1394 continue;
1395 }
1396
1397 /*
1398 * If the remote ref has moved and is now different
1399 * from what we expect, reject any push.
1400 *
1401 * It also is an error if the user told us to check
1402 * with the remote-tracking branch to find the value
1403 * to expect, but we did not have such a tracking
1404 * branch.
1405 */
1406 if (ref->expect_old_sha1) {
1407 if (!oideq(&ref->old_oid, &ref->old_oid_expect))
1408 reject_reason = REF_STATUS_REJECT_STALE;
1409 else
1410 /* If the ref isn't stale then force the update. */
1411 force_ref_update = 1;
1412 }
1413
1414 /*
1415 * If the update isn't already rejected then check
1416 * the usual "must fast-forward" rules.
1417 *
1418 * Decide whether an individual refspec A:B can be
1419 * pushed. The push will succeed if any of the
1420 * following are true:
1421 *
1422 * (1) the remote reference B does not exist
1423 *
1424 * (2) the remote reference B is being removed (i.e.,
1425 * pushing :B where no source is specified)
1426 *
1427 * (3) the destination is not under refs/tags/, and
1428 * if the old and new value is a commit, the new
1429 * is a descendant of the old.
1430 *
1431 * (4) it is forced using the +A:B notation, or by
1432 * passing the --force argument
1433 */
1434
1435 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1436 if (starts_with(ref->name, "refs/tags/"))
1437 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1438 else if (!has_object_file(&ref->old_oid))
1439 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1440 else if (!lookup_commit_reference_gently(the_repository, &ref->old_oid, 1) ||
1441 !lookup_commit_reference_gently(the_repository, &ref->new_oid, 1))
1442 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1443 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1444 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1445 }
1446
1447 /*
1448 * "--force" will defeat any rejection implemented
1449 * by the rules above.
1450 */
1451 if (!force_ref_update)
1452 ref->status = reject_reason;
1453 else if (reject_reason)
1454 ref->forced_update = 1;
1455 }
1456 }
1457
1458 static void set_merge(struct branch *ret)
1459 {
1460 struct remote *remote;
1461 char *ref;
1462 struct object_id oid;
1463 int i;
1464
1465 if (!ret)
1466 return; /* no branch */
1467 if (ret->merge)
1468 return; /* already run */
1469 if (!ret->remote_name || !ret->merge_nr) {
1470 /*
1471 * no merge config; let's make sure we don't confuse callers
1472 * with a non-zero merge_nr but a NULL merge
1473 */
1474 ret->merge_nr = 0;
1475 return;
1476 }
1477
1478 remote = remote_get(ret->remote_name);
1479
1480 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1481 for (i = 0; i < ret->merge_nr; i++) {
1482 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1483 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1484 if (!remote_find_tracking(remote, ret->merge[i]) ||
1485 strcmp(ret->remote_name, "."))
1486 continue;
1487 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1488 &oid, &ref) == 1)
1489 ret->merge[i]->dst = ref;
1490 else
1491 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1492 }
1493 }
1494
1495 struct branch *branch_get(const char *name)
1496 {
1497 struct branch *ret;
1498
1499 read_config();
1500 if (!name || !*name || !strcmp(name, "HEAD"))
1501 ret = current_branch;
1502 else
1503 ret = make_branch(name, 0);
1504 set_merge(ret);
1505 return ret;
1506 }
1507
1508 int branch_has_merge_config(struct branch *branch)
1509 {
1510 return branch && !!branch->merge;
1511 }
1512
1513 int branch_merge_matches(struct branch *branch,
1514 int i,
1515 const char *refname)
1516 {
1517 if (!branch || i < 0 || i >= branch->merge_nr)
1518 return 0;
1519 return refname_match(branch->merge[i]->src, refname);
1520 }
1521
1522 __attribute__((format (printf,2,3)))
1523 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1524 {
1525 if (err) {
1526 va_list ap;
1527 va_start(ap, fmt);
1528 strbuf_vaddf(err, fmt, ap);
1529 va_end(ap);
1530 }
1531 return NULL;
1532 }
1533
1534 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1535 {
1536 if (!branch)
1537 return error_buf(err, _("HEAD does not point to a branch"));
1538
1539 if (!branch->merge || !branch->merge[0]) {
1540 /*
1541 * no merge config; is it because the user didn't define any,
1542 * or because it is not a real branch, and get_branch
1543 * auto-vivified it?
1544 */
1545 if (!ref_exists(branch->refname))
1546 return error_buf(err, _("no such branch: '%s'"),
1547 branch->name);
1548 return error_buf(err,
1549 _("no upstream configured for branch '%s'"),
1550 branch->name);
1551 }
1552
1553 if (!branch->merge[0]->dst)
1554 return error_buf(err,
1555 _("upstream branch '%s' not stored as a remote-tracking branch"),
1556 branch->merge[0]->src);
1557
1558 return branch->merge[0]->dst;
1559 }
1560
1561 static const char *tracking_for_push_dest(struct remote *remote,
1562 const char *refname,
1563 struct strbuf *err)
1564 {
1565 char *ret;
1566
1567 ret = apply_refspecs(&remote->fetch, refname);
1568 if (!ret)
1569 return error_buf(err,
1570 _("push destination '%s' on remote '%s' has no local tracking branch"),
1571 refname, remote->name);
1572 return ret;
1573 }
1574
1575 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1576 {
1577 struct remote *remote;
1578
1579 remote = remote_get(pushremote_for_branch(branch, NULL));
1580 if (!remote)
1581 return error_buf(err,
1582 _("branch '%s' has no remote for pushing"),
1583 branch->name);
1584
1585 if (remote->push.nr) {
1586 char *dst;
1587 const char *ret;
1588
1589 dst = apply_refspecs(&remote->push, branch->refname);
1590 if (!dst)
1591 return error_buf(err,
1592 _("push refspecs for '%s' do not include '%s'"),
1593 remote->name, branch->name);
1594
1595 ret = tracking_for_push_dest(remote, dst, err);
1596 free(dst);
1597 return ret;
1598 }
1599
1600 if (remote->mirror)
1601 return tracking_for_push_dest(remote, branch->refname, err);
1602
1603 switch (push_default) {
1604 case PUSH_DEFAULT_NOTHING:
1605 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1606
1607 case PUSH_DEFAULT_MATCHING:
1608 case PUSH_DEFAULT_CURRENT:
1609 return tracking_for_push_dest(remote, branch->refname, err);
1610
1611 case PUSH_DEFAULT_UPSTREAM:
1612 return branch_get_upstream(branch, err);
1613
1614 case PUSH_DEFAULT_UNSPECIFIED:
1615 case PUSH_DEFAULT_SIMPLE:
1616 {
1617 const char *up, *cur;
1618
1619 up = branch_get_upstream(branch, err);
1620 if (!up)
1621 return NULL;
1622 cur = tracking_for_push_dest(remote, branch->refname, err);
1623 if (!cur)
1624 return NULL;
1625 if (strcmp(cur, up))
1626 return error_buf(err,
1627 _("cannot resolve 'simple' push to a single destination"));
1628 return cur;
1629 }
1630 }
1631
1632 BUG("unhandled push situation");
1633 }
1634
1635 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1636 {
1637 if (!branch)
1638 return error_buf(err, _("HEAD does not point to a branch"));
1639
1640 if (!branch->push_tracking_ref)
1641 branch->push_tracking_ref = branch_get_push_1(branch, err);
1642 return branch->push_tracking_ref;
1643 }
1644
1645 static int ignore_symref_update(const char *refname)
1646 {
1647 int flag;
1648
1649 if (!resolve_ref_unsafe(refname, 0, NULL, &flag))
1650 return 0; /* non-existing refs are OK */
1651 return (flag & REF_ISSYMREF);
1652 }
1653
1654 /*
1655 * Create and return a list of (struct ref) consisting of copies of
1656 * each remote_ref that matches refspec. refspec must be a pattern.
1657 * Fill in the copies' peer_ref to describe the local tracking refs to
1658 * which they map. Omit any references that would map to an existing
1659 * local symbolic ref.
1660 */
1661 static struct ref *get_expanded_map(const struct ref *remote_refs,
1662 const struct refspec_item *refspec)
1663 {
1664 const struct ref *ref;
1665 struct ref *ret = NULL;
1666 struct ref **tail = &ret;
1667
1668 for (ref = remote_refs; ref; ref = ref->next) {
1669 char *expn_name = NULL;
1670
1671 if (strchr(ref->name, '^'))
1672 continue; /* a dereference item */
1673 if (match_name_with_pattern(refspec->src, ref->name,
1674 refspec->dst, &expn_name) &&
1675 !ignore_symref_update(expn_name)) {
1676 struct ref *cpy = copy_ref(ref);
1677
1678 cpy->peer_ref = alloc_ref(expn_name);
1679 if (refspec->force)
1680 cpy->peer_ref->force = 1;
1681 *tail = cpy;
1682 tail = &cpy->next;
1683 }
1684 free(expn_name);
1685 }
1686
1687 return ret;
1688 }
1689
1690 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1691 {
1692 const struct ref *ref;
1693 const struct ref *best_match = NULL;
1694 int best_score = 0;
1695
1696 for (ref = refs; ref; ref = ref->next) {
1697 int score = refname_match(name, ref->name);
1698
1699 if (best_score < score) {
1700 best_match = ref;
1701 best_score = score;
1702 }
1703 }
1704 return best_match;
1705 }
1706
1707 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1708 {
1709 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1710
1711 if (!ref)
1712 return NULL;
1713
1714 return copy_ref(ref);
1715 }
1716
1717 static struct ref *get_local_ref(const char *name)
1718 {
1719 if (!name || name[0] == '\0')
1720 return NULL;
1721
1722 if (starts_with(name, "refs/"))
1723 return alloc_ref(name);
1724
1725 if (starts_with(name, "heads/") ||
1726 starts_with(name, "tags/") ||
1727 starts_with(name, "remotes/"))
1728 return alloc_ref_with_prefix("refs/", 5, name);
1729
1730 return alloc_ref_with_prefix("refs/heads/", 11, name);
1731 }
1732
1733 int get_fetch_map(const struct ref *remote_refs,
1734 const struct refspec_item *refspec,
1735 struct ref ***tail,
1736 int missing_ok)
1737 {
1738 struct ref *ref_map, **rmp;
1739
1740 if (refspec->pattern) {
1741 ref_map = get_expanded_map(remote_refs, refspec);
1742 } else {
1743 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1744
1745 if (refspec->exact_sha1) {
1746 ref_map = alloc_ref(name);
1747 get_oid_hex(name, &ref_map->old_oid);
1748 ref_map->exact_oid = 1;
1749 } else {
1750 ref_map = get_remote_ref(remote_refs, name);
1751 }
1752 if (!missing_ok && !ref_map)
1753 die("Couldn't find remote ref %s", name);
1754 if (ref_map) {
1755 ref_map->peer_ref = get_local_ref(refspec->dst);
1756 if (ref_map->peer_ref && refspec->force)
1757 ref_map->peer_ref->force = 1;
1758 }
1759 }
1760
1761 for (rmp = &ref_map; *rmp; ) {
1762 if ((*rmp)->peer_ref) {
1763 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1764 check_refname_format((*rmp)->peer_ref->name, 0)) {
1765 struct ref *ignore = *rmp;
1766 error("* Ignoring funny ref '%s' locally",
1767 (*rmp)->peer_ref->name);
1768 *rmp = (*rmp)->next;
1769 free(ignore->peer_ref);
1770 free(ignore);
1771 continue;
1772 }
1773 }
1774 rmp = &((*rmp)->next);
1775 }
1776
1777 if (ref_map)
1778 tail_link_ref(ref_map, tail);
1779
1780 return 0;
1781 }
1782
1783 int resolve_remote_symref(struct ref *ref, struct ref *list)
1784 {
1785 if (!ref->symref)
1786 return 0;
1787 for (; list; list = list->next)
1788 if (!strcmp(ref->symref, list->name)) {
1789 oidcpy(&ref->old_oid, &list->old_oid);
1790 return 0;
1791 }
1792 return 1;
1793 }
1794
1795 /*
1796 * Lookup the upstream branch for the given branch and if present, optionally
1797 * compute the commit ahead/behind values for the pair.
1798 *
1799 * If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
1800 * counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
1801 * the (potentially expensive) a/b computation (*num_ours and *num_theirs are
1802 * set to zero).
1803 *
1804 * The name of the upstream branch (or NULL if no upstream is defined) is
1805 * returned via *upstream_name, if it is not itself NULL.
1806 *
1807 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1808 * upstream defined, or ref does not exist). Returns 0 if the commits are
1809 * identical. Returns 1 if commits are different.
1810 */
1811 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1812 const char **upstream_name, enum ahead_behind_flags abf)
1813 {
1814 struct object_id oid;
1815 struct commit *ours, *theirs;
1816 struct rev_info revs;
1817 const char *base;
1818 struct argv_array argv = ARGV_ARRAY_INIT;
1819
1820 /* Cannot stat unless we are marked to build on top of somebody else. */
1821 base = branch_get_upstream(branch, NULL);
1822 if (upstream_name)
1823 *upstream_name = base;
1824 if (!base)
1825 return -1;
1826
1827 /* Cannot stat if what we used to build on no longer exists */
1828 if (read_ref(base, &oid))
1829 return -1;
1830 theirs = lookup_commit_reference(the_repository, &oid);
1831 if (!theirs)
1832 return -1;
1833
1834 if (read_ref(branch->refname, &oid))
1835 return -1;
1836 ours = lookup_commit_reference(the_repository, &oid);
1837 if (!ours)
1838 return -1;
1839
1840 *num_theirs = *num_ours = 0;
1841
1842 /* are we the same? */
1843 if (theirs == ours)
1844 return 0;
1845 if (abf == AHEAD_BEHIND_QUICK)
1846 return 1;
1847 if (abf != AHEAD_BEHIND_FULL)
1848 BUG("stat_tracking_info: invalid abf '%d'", abf);
1849
1850 /* Run "rev-list --left-right ours...theirs" internally... */
1851 argv_array_push(&argv, ""); /* ignored */
1852 argv_array_push(&argv, "--left-right");
1853 argv_array_pushf(&argv, "%s...%s",
1854 oid_to_hex(&ours->object.oid),
1855 oid_to_hex(&theirs->object.oid));
1856 argv_array_push(&argv, "--");
1857
1858 init_revisions(&revs, NULL);
1859 setup_revisions(argv.argc, argv.argv, &revs, NULL);
1860 if (prepare_revision_walk(&revs))
1861 die("revision walk setup failed");
1862
1863 /* ... and count the commits on each side. */
1864 while (1) {
1865 struct commit *c = get_revision(&revs);
1866 if (!c)
1867 break;
1868 if (c->object.flags & SYMMETRIC_LEFT)
1869 (*num_ours)++;
1870 else
1871 (*num_theirs)++;
1872 }
1873
1874 /* clear object flags smudged by the above traversal */
1875 clear_commit_marks(ours, ALL_REV_FLAGS);
1876 clear_commit_marks(theirs, ALL_REV_FLAGS);
1877
1878 argv_array_clear(&argv);
1879 return 1;
1880 }
1881
1882 /*
1883 * Return true when there is anything to report, otherwise false.
1884 */
1885 int format_tracking_info(struct branch *branch, struct strbuf *sb,
1886 enum ahead_behind_flags abf)
1887 {
1888 int ours, theirs, sti;
1889 const char *full_base;
1890 char *base;
1891 int upstream_is_gone = 0;
1892
1893 sti = stat_tracking_info(branch, &ours, &theirs, &full_base, abf);
1894 if (sti < 0) {
1895 if (!full_base)
1896 return 0;
1897 upstream_is_gone = 1;
1898 }
1899
1900 base = shorten_unambiguous_ref(full_base, 0);
1901 if (upstream_is_gone) {
1902 strbuf_addf(sb,
1903 _("Your branch is based on '%s', but the upstream is gone.\n"),
1904 base);
1905 if (advice_status_hints)
1906 strbuf_addstr(sb,
1907 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
1908 } else if (!sti) {
1909 strbuf_addf(sb,
1910 _("Your branch is up to date with '%s'.\n"),
1911 base);
1912 } else if (abf == AHEAD_BEHIND_QUICK) {
1913 strbuf_addf(sb,
1914 _("Your branch and '%s' refer to different commits.\n"),
1915 base);
1916 if (advice_status_hints)
1917 strbuf_addf(sb, _(" (use \"%s\" for details)\n"),
1918 "git status --ahead-behind");
1919 } else if (!theirs) {
1920 strbuf_addf(sb,
1921 Q_("Your branch is ahead of '%s' by %d commit.\n",
1922 "Your branch is ahead of '%s' by %d commits.\n",
1923 ours),
1924 base, ours);
1925 if (advice_status_hints)
1926 strbuf_addstr(sb,
1927 _(" (use \"git push\" to publish your local commits)\n"));
1928 } else if (!ours) {
1929 strbuf_addf(sb,
1930 Q_("Your branch is behind '%s' by %d commit, "
1931 "and can be fast-forwarded.\n",
1932 "Your branch is behind '%s' by %d commits, "
1933 "and can be fast-forwarded.\n",
1934 theirs),
1935 base, theirs);
1936 if (advice_status_hints)
1937 strbuf_addstr(sb,
1938 _(" (use \"git pull\" to update your local branch)\n"));
1939 } else {
1940 strbuf_addf(sb,
1941 Q_("Your branch and '%s' have diverged,\n"
1942 "and have %d and %d different commit each, "
1943 "respectively.\n",
1944 "Your branch and '%s' have diverged,\n"
1945 "and have %d and %d different commits each, "
1946 "respectively.\n",
1947 ours + theirs),
1948 base, ours, theirs);
1949 if (advice_status_hints)
1950 strbuf_addstr(sb,
1951 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
1952 }
1953 free(base);
1954 return 1;
1955 }
1956
1957 static int one_local_ref(const char *refname, const struct object_id *oid,
1958 int flag, void *cb_data)
1959 {
1960 struct ref ***local_tail = cb_data;
1961 struct ref *ref;
1962
1963 /* we already know it starts with refs/ to get here */
1964 if (check_refname_format(refname + 5, 0))
1965 return 0;
1966
1967 ref = alloc_ref(refname);
1968 oidcpy(&ref->new_oid, oid);
1969 **local_tail = ref;
1970 *local_tail = &ref->next;
1971 return 0;
1972 }
1973
1974 struct ref *get_local_heads(void)
1975 {
1976 struct ref *local_refs = NULL, **local_tail = &local_refs;
1977
1978 for_each_ref(one_local_ref, &local_tail);
1979 return local_refs;
1980 }
1981
1982 struct ref *guess_remote_head(const struct ref *head,
1983 const struct ref *refs,
1984 int all)
1985 {
1986 const struct ref *r;
1987 struct ref *list = NULL;
1988 struct ref **tail = &list;
1989
1990 if (!head)
1991 return NULL;
1992
1993 /*
1994 * Some transports support directly peeking at
1995 * where HEAD points; if that is the case, then
1996 * we don't have to guess.
1997 */
1998 if (head->symref)
1999 return copy_ref(find_ref_by_name(refs, head->symref));
2000
2001 /* If refs/heads/master could be right, it is. */
2002 if (!all) {
2003 r = find_ref_by_name(refs, "refs/heads/master");
2004 if (r && oideq(&r->old_oid, &head->old_oid))
2005 return copy_ref(r);
2006 }
2007
2008 /* Look for another ref that points there */
2009 for (r = refs; r; r = r->next) {
2010 if (r != head &&
2011 starts_with(r->name, "refs/heads/") &&
2012 oideq(&r->old_oid, &head->old_oid)) {
2013 *tail = copy_ref(r);
2014 tail = &((*tail)->next);
2015 if (!all)
2016 break;
2017 }
2018 }
2019
2020 return list;
2021 }
2022
2023 struct stale_heads_info {
2024 struct string_list *ref_names;
2025 struct ref **stale_refs_tail;
2026 struct refspec *rs;
2027 };
2028
2029 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2030 int flags, void *cb_data)
2031 {
2032 struct stale_heads_info *info = cb_data;
2033 struct string_list matches = STRING_LIST_INIT_DUP;
2034 struct refspec_item query;
2035 int i, stale = 1;
2036 memset(&query, 0, sizeof(struct refspec_item));
2037 query.dst = (char *)refname;
2038
2039 query_refspecs_multiple(info->rs, &query, &matches);
2040 if (matches.nr == 0)
2041 goto clean_exit; /* No matches */
2042
2043 /*
2044 * If we did find a suitable refspec and it's not a symref and
2045 * it's not in the list of refs that currently exist in that
2046 * remote, we consider it to be stale. In order to deal with
2047 * overlapping refspecs, we need to go over all of the
2048 * matching refs.
2049 */
2050 if (flags & REF_ISSYMREF)
2051 goto clean_exit;
2052
2053 for (i = 0; stale && i < matches.nr; i++)
2054 if (string_list_has_string(info->ref_names, matches.items[i].string))
2055 stale = 0;
2056
2057 if (stale) {
2058 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2059 oidcpy(&ref->new_oid, oid);
2060 }
2061
2062 clean_exit:
2063 string_list_clear(&matches, 0);
2064 return 0;
2065 }
2066
2067 struct ref *get_stale_heads(struct refspec *rs, struct ref *fetch_map)
2068 {
2069 struct ref *ref, *stale_refs = NULL;
2070 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2071 struct stale_heads_info info;
2072
2073 info.ref_names = &ref_names;
2074 info.stale_refs_tail = &stale_refs;
2075 info.rs = rs;
2076 for (ref = fetch_map; ref; ref = ref->next)
2077 string_list_append(&ref_names, ref->name);
2078 string_list_sort(&ref_names);
2079 for_each_ref(get_stale_heads_cb, &info);
2080 string_list_clear(&ref_names, 0);
2081 return stale_refs;
2082 }
2083
2084 /*
2085 * Compare-and-swap
2086 */
2087 static void clear_cas_option(struct push_cas_option *cas)
2088 {
2089 int i;
2090
2091 for (i = 0; i < cas->nr; i++)
2092 free(cas->entry[i].refname);
2093 free(cas->entry);
2094 memset(cas, 0, sizeof(*cas));
2095 }
2096
2097 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2098 const char *refname,
2099 size_t refnamelen)
2100 {
2101 struct push_cas *entry;
2102 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2103 entry = &cas->entry[cas->nr++];
2104 memset(entry, 0, sizeof(*entry));
2105 entry->refname = xmemdupz(refname, refnamelen);
2106 return entry;
2107 }
2108
2109 static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2110 {
2111 const char *colon;
2112 struct push_cas *entry;
2113
2114 if (unset) {
2115 /* "--no-<option>" */
2116 clear_cas_option(cas);
2117 return 0;
2118 }
2119
2120 if (!arg) {
2121 /* just "--<option>" */
2122 cas->use_tracking_for_rest = 1;
2123 return 0;
2124 }
2125
2126 /* "--<option>=refname" or "--<option>=refname:value" */
2127 colon = strchrnul(arg, ':');
2128 entry = add_cas_entry(cas, arg, colon - arg);
2129 if (!*colon)
2130 entry->use_tracking = 1;
2131 else if (!colon[1])
2132 oidclr(&entry->expect);
2133 else if (get_oid(colon + 1, &entry->expect))
2134 return error("cannot parse expected object name '%s'", colon + 1);
2135 return 0;
2136 }
2137
2138 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2139 {
2140 return parse_push_cas_option(opt->value, arg, unset);
2141 }
2142
2143 int is_empty_cas(const struct push_cas_option *cas)
2144 {
2145 return !cas->use_tracking_for_rest && !cas->nr;
2146 }
2147
2148 /*
2149 * Look at remote.fetch refspec and see if we have a remote
2150 * tracking branch for the refname there. Fill its current
2151 * value in sha1[].
2152 * If we cannot do so, return negative to signal an error.
2153 */
2154 static int remote_tracking(struct remote *remote, const char *refname,
2155 struct object_id *oid)
2156 {
2157 char *dst;
2158
2159 dst = apply_refspecs(&remote->fetch, refname);
2160 if (!dst)
2161 return -1; /* no tracking ref for refname at remote */
2162 if (read_ref(dst, oid))
2163 return -1; /* we know what the tracking ref is but we cannot read it */
2164 return 0;
2165 }
2166
2167 static void apply_cas(struct push_cas_option *cas,
2168 struct remote *remote,
2169 struct ref *ref)
2170 {
2171 int i;
2172
2173 /* Find an explicit --<option>=<name>[:<value>] entry */
2174 for (i = 0; i < cas->nr; i++) {
2175 struct push_cas *entry = &cas->entry[i];
2176 if (!refname_match(entry->refname, ref->name))
2177 continue;
2178 ref->expect_old_sha1 = 1;
2179 if (!entry->use_tracking)
2180 oidcpy(&ref->old_oid_expect, &entry->expect);
2181 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2182 oidclr(&ref->old_oid_expect);
2183 return;
2184 }
2185
2186 /* Are we using "--<option>" to cover all? */
2187 if (!cas->use_tracking_for_rest)
2188 return;
2189
2190 ref->expect_old_sha1 = 1;
2191 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2192 oidclr(&ref->old_oid_expect);
2193 }
2194
2195 void apply_push_cas(struct push_cas_option *cas,
2196 struct remote *remote,
2197 struct ref *remote_refs)
2198 {
2199 struct ref *ref;
2200 for (ref = remote_refs; ref; ref = ref->next)
2201 apply_cas(cas, remote, ref);
2202 }
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