remote.c · leroysheep/CrazyWebTemps

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bisect jch maint master next seen test todo

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1	#define USE_THE_REPOSITORY_VARIABLE
2	#define DISABLE_SIGN_COMPARE_WARNINGS
3
4	#include "git-compat-util.h"
5	#include "abspath.h"
6	#include "config.h"
7	#include "environment.h"
8	#include "gettext.h"
9	#include "hex.h"
10	#include "remote.h"
11	#include "url.h"
12	#include "urlmatch.h"
13	#include "refs.h"
14	#include "refspec.h"
15	#include "object-name.h"
16	#include "odb.h"
17	#include "path.h"
18	#include "commit.h"
19	#include "diff.h"
20	#include "revision.h"
21	#include "dir.h"
22	#include "setup.h"
23	#include "string-list.h"
24	#include "strvec.h"
25	#include "commit-reach.h"
26	#include "advice.h"
27	#include "connect.h"
28	#include "parse-options.h"
29	#include "transport.h"
30
31	enum map_direction { FROM_SRC, FROM_DST };
32
33	enum {
34	ENABLE_ADVICE_PULL = (1 << 0),
35	ENABLE_ADVICE_PUSH = (1 << 1),
36	ENABLE_ADVICE_DIVERGENCE = (1 << 2),
37	};
38
39	struct counted_string {
40	size_t len;
41	const char *s;
42	};
43
44	static int valid_remote(const struct remote *remote)
45	{
46	return !!remote->url.nr;
47	}
48
49	static char alias_url(const char url, struct rewrites *r)
50	{
51	int i, j;
52	struct counted_string *longest;
53	int longest_i;
54
55	longest = NULL;
56	longest_i = -1;
57	for (i = 0; i < r->rewrite_nr; i++) {
58	if (!r->rewrite[i])
59	continue;
60	for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
61	if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
62	(!longest \|\|
63	longest->len < r->rewrite[i]->instead_of[j].len)) {
64	longest = &(r->rewrite[i]->instead_of[j]);
65	longest_i = i;
66	}
67	}
68	}
69	if (!longest)
70	return NULL;
71
72	return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
73	}
74
75	static void add_url(struct remote remote, const char url)
76	{
77	if (*url)
78	strvec_push(&remote->url, url);
79	else
80	strvec_clear(&remote->url);
81	}
82
83	static void add_pushurl(struct remote remote, const char pushurl)
84	{
85	if (*pushurl)
86	strvec_push(&remote->pushurl, pushurl);
87	else
88	strvec_clear(&remote->pushurl);
89	}
90
91	static void add_pushurl_alias(struct remote_state *remote_state,
92	struct remote remote, const char url)
93	{
94	char *alias = alias_url(url, &remote_state->rewrites_push);
95	if (alias)
96	add_pushurl(remote, alias);
97	free(alias);
98	}
99
100	static void add_url_alias(struct remote_state *remote_state,
101	struct remote remote, const char url)
102	{
103	char *alias = alias_url(url, &remote_state->rewrites);
104	add_url(remote, alias ? alias : url);
105	add_pushurl_alias(remote_state, remote, url);
106	free(alias);
107	}
108
109	struct remotes_hash_key {
110	const char *str;
111	int len;
112	};
113
114	static int remotes_hash_cmp(const void *cmp_data UNUSED,
115	const struct hashmap_entry *eptr,
116	const struct hashmap_entry *entry_or_key,
117	const void *keydata)
118	{
119	const struct remote a, b;
120	const struct remotes_hash_key *key = keydata;
121
122	a = container_of(eptr, const struct remote, ent);
123	b = container_of(entry_or_key, const struct remote, ent);
124
125	if (key)
126	return !!xstrncmpz(a->name, key->str, key->len);
127	else
128	return strcmp(a->name, b->name);
129	}
130
131	static struct remote make_remote(struct remote_state remote_state,
132	const char *name, int len)
133	{
134	struct remote *ret;
135	struct remotes_hash_key lookup;
136	struct hashmap_entry lookup_entry, *e;
137
138	if (!len)
139	len = strlen(name);
140
141	lookup.str = name;
142	lookup.len = len;
143	hashmap_entry_init(&lookup_entry, memhash(name, len));
144
145	e = hashmap_get(&remote_state->remotes_hash, &lookup_entry, &lookup);
146	if (e)
147	return container_of(e, struct remote, ent);
148
149	CALLOC_ARRAY(ret, 1);
150	ret->prune = -1; /* unspecified */
151	ret->prune_tags = -1; /* unspecified */
152	ret->name = xstrndup(name, len);
153	refspec_init_push(&ret->push, the_hash_algo);
154	refspec_init_fetch(&ret->fetch, the_hash_algo);
155	string_list_init_dup(&ret->server_options);
156	string_list_init_dup(&ret->negotiation_restrict);
157	string_list_init_dup(&ret->negotiation_include);
158
159	ALLOC_GROW(remote_state->remotes, remote_state->remotes_nr + 1,
160	remote_state->remotes_alloc);
161	remote_state->remotes[remote_state->remotes_nr++] = ret;
162
163	hashmap_entry_init(&ret->ent, lookup_entry.hash);
164	if (hashmap_put_entry(&remote_state->remotes_hash, ret, ent))
165	BUG("hashmap_put overwrote entry after hashmap_get returned NULL");
166	return ret;
167	}
168
169	static void remote_clear(struct remote *remote)
170	{
171	free((char *)remote->name);
172	free((char *)remote->foreign_vcs);
173
174	strvec_clear(&remote->url);
175	strvec_clear(&remote->pushurl);
176
177	refspec_clear(&remote->push);
178	refspec_clear(&remote->fetch);
179
180	free((char *)remote->receivepack);
181	free((char *)remote->uploadpack);
182	FREE_AND_NULL(remote->http_proxy);
183	FREE_AND_NULL(remote->http_proxy_authmethod);
184	string_list_clear(&remote->server_options, 0);
185	string_list_clear(&remote->negotiation_restrict, 0);
186	string_list_clear(&remote->negotiation_include, 0);
187	}
188
189	static void add_merge(struct branch branch, const char name)
190	{
191	struct refspec_item *merge;
192
193	ALLOC_GROW(branch->merge, branch->merge_nr + 1,
194	branch->merge_alloc);
195
196	merge = xcalloc(1, sizeof(*merge));
197	merge->src = xstrdup(name);
198
199	branch->merge[branch->merge_nr++] = merge;
200	}
201
202	struct branches_hash_key {
203	const char *str;
204	int len;
205	};
206
207	static int branches_hash_cmp(const void *cmp_data UNUSED,
208	const struct hashmap_entry *eptr,
209	const struct hashmap_entry *entry_or_key,
210	const void *keydata)
211	{
212	const struct branch a, b;
213	const struct branches_hash_key *key = keydata;
214
215	a = container_of(eptr, const struct branch, ent);
216	b = container_of(entry_or_key, const struct branch, ent);
217
218	if (key)
219	return !!xstrncmpz(a->name, key->str, key->len);
220	else
221	return strcmp(a->name, b->name);
222	}
223
224	static struct branch find_branch(struct remote_state remote_state,
225	const char *name, size_t len)
226	{
227	struct branches_hash_key lookup;
228	struct hashmap_entry lookup_entry, *e;
229
230	lookup.str = name;
231	lookup.len = len;
232	hashmap_entry_init(&lookup_entry, memhash(name, len));
233
234	e = hashmap_get(&remote_state->branches_hash, &lookup_entry, &lookup);
235	if (e)
236	return container_of(e, struct branch, ent);
237
238	return NULL;
239	}
240
241	static void die_on_missing_branch(struct repository *repo,
242	struct branch *branch)
243	{
244	/* branch == NULL is always valid because it represents detached HEAD. */
245	if (branch &&
246	branch != find_branch(repo->remote_state, branch->name,
247	strlen(branch->name)))
248	die("branch %s was not found in the repository", branch->name);
249	}
250
251	static struct branch make_branch(struct remote_state remote_state,
252	const char *name, size_t len)
253	{
254	struct branch *ret;
255
256	ret = find_branch(remote_state, name, len);
257	if (ret)
258	return ret;
259
260	CALLOC_ARRAY(ret, 1);
261	ret->name = xstrndup(name, len);
262	ret->refname = xstrfmt("refs/heads/%s", ret->name);
263
264	hashmap_entry_init(&ret->ent, memhash(name, len));
265	if (hashmap_put_entry(&remote_state->branches_hash, ret, ent))
266	BUG("hashmap_put overwrote entry after hashmap_get returned NULL");
267	return ret;
268	}
269
270	static void merge_clear(struct branch *branch)
271	{
272	for (int i = 0; i < branch->merge_nr; i++) {
273	refspec_item_clear(branch->merge[i]);
274	free(branch->merge[i]);
275	}
276	FREE_AND_NULL(branch->merge);
277	branch->merge_nr = 0;
278	}
279
280	static void branch_release(struct branch *branch)
281	{
282	free((char *)branch->name);
283	free((char *)branch->refname);
284	free(branch->remote_name);
285	free(branch->pushremote_name);
286	free(branch->push_tracking_ref);
287	merge_clear(branch);
288	}
289
290	static struct rewrite make_rewrite(struct rewrites r,
291	const char *base, size_t len)
292	{
293	struct rewrite *ret;
294	int i;
295
296	for (i = 0; i < r->rewrite_nr; i++) {
297	if (len == r->rewrite[i]->baselen &&
298	!strncmp(base, r->rewrite[i]->base, len))
299	return r->rewrite[i];
300	}
301
302	ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
303	CALLOC_ARRAY(ret, 1);
304	r->rewrite[r->rewrite_nr++] = ret;
305	ret->base = xstrndup(base, len);
306	ret->baselen = len;
307	return ret;
308	}
309
310	static void rewrites_release(struct rewrites *r)
311	{
312	for (int i = 0; i < r->rewrite_nr; i++) {
313	struct rewrite *rewrite = r->rewrite[i];
314
315	free((char *)rewrite->base);
316	for (int j = 0; j < rewrite->instead_of_nr; j++)
317	free((char *)rewrite->instead_of[j].s);
318	free(rewrite->instead_of);
319	free(rewrite);
320	}
321	free(r->rewrite);
322	memset(r, 0, sizeof(*r));
323	}
324
325	static void add_instead_of(struct rewrite rewrite, const char instead_of)
326	{
327	ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
328	rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
329	rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
330	rewrite->instead_of_nr++;
331	}
332
333	#ifndef WITH_BREAKING_CHANGES
334	static const char skip_spaces(const char s)
335	{
336	while (isspace(*s))
337	s++;
338	return s;
339	}
340
341	static void warn_about_deprecated_remote_type(const char *type,
342	const struct remote *remote)
343	{
344	warning(_("reading remote from \"%s/%s\", which is nominated for removal.\n"
345	"\n"
346	"If you still use the \"remotes/\" directory it is recommended to\n"
347	"migrate to config-based remotes:\n"
348	"\n"
349	"\tgit remote rename %s %s\n"
350	"\n"
351	"If you cannot, please let us know why you still need to use it by\n"
352	"sending an e-mail to <git@vger.kernel.org>."),
353	type, remote->name, remote->name, remote->name);
354	}
355
356	static void read_remotes_file(struct repository repo, struct remote remote)
357	{
358	struct strbuf buf = STRBUF_INIT;
359	FILE *f = fopen_or_warn(repo_git_path_append(repo, &buf,
360	"remotes/%s", remote->name), "r");
361
362	if (!f)
363	goto out;
364
365	warn_about_deprecated_remote_type("remotes", remote);
366
367	remote->configured_in_repo = 1;
368	remote->origin = REMOTE_REMOTES;
369	while (strbuf_getline(&buf, f) != EOF) {
370	const char *v;
371
372	strbuf_rtrim(&buf);
373
374	if (skip_prefix(buf.buf, "URL:", &v))
375	add_url_alias(repo->remote_state, remote,
376	skip_spaces(v));
377	else if (skip_prefix(buf.buf, "Push:", &v))
378	refspec_append(&remote->push, skip_spaces(v));
379	else if (skip_prefix(buf.buf, "Pull:", &v))
380	refspec_append(&remote->fetch, skip_spaces(v));
381	}
382	fclose(f);
383
384	out:
385	strbuf_release(&buf);
386	}
387
388	static void read_branches_file(struct repository repo, struct remote remote)
389	{
390	char frag, to_free = NULL;
391	struct strbuf buf = STRBUF_INIT;
392	FILE *f = fopen_or_warn(repo_git_path_append(repo, &buf,
393	"branches/%s", remote->name), "r");
394
395	if (!f)
396	goto out;
397
398	warn_about_deprecated_remote_type("branches", remote);
399
400	strbuf_getline_lf(&buf, f);
401	fclose(f);
402	strbuf_trim(&buf);
403	if (!buf.len)
404	goto out;
405
406	remote->configured_in_repo = 1;
407	remote->origin = REMOTE_BRANCHES;
408
409	/*
410	* The branches file would have URL and optionally
411	* #branch specified. The default (or specified) branch is
412	* fetched and stored in the local branch matching the
413	* remote name.
414	*/
415	frag = strchr(buf.buf, '#');
416	if (frag)
417	*(frag++) = '\0';
418	else
419	frag = to_free = repo_default_branch_name(repo, 0);
420
421	add_url_alias(repo->remote_state, remote, buf.buf);
422	refspec_appendf(&remote->fetch, "refs/heads/%s:refs/heads/%s",
423	frag, remote->name);
424
425	/*
426	* Cogito compatible push: push current HEAD to remote #branch
427	* (master if missing)
428	*/
429	refspec_appendf(&remote->push, "HEAD:refs/heads/%s", frag);
430	remote->fetch_tags = 1; /* always auto-follow */
431
432	out:
433	strbuf_release(&buf);
434	free(to_free);
435	}
436	#endif /* WITH_BREAKING_CHANGES */
437
438	static int handle_config(const char key, const char value,
439	const struct config_context ctx, void cb)
440	{
441	const char *name;
442	size_t namelen;
443	const char *subkey;
444	struct remote *remote;
445	struct branch *branch;
446	struct remote_state *remote_state = cb;
447	const struct key_value_info *kvi = ctx->kvi;
448
449	if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
450	/* There is no subsection. */
451	if (!name)
452	return 0;
453	/* There is a subsection, but it is empty. */
454	if (!namelen)
455	return -1;
456	branch = make_branch(remote_state, name, namelen);
457	if (!strcmp(subkey, "remote")) {
458	FREE_AND_NULL(branch->remote_name);
459	return git_config_string(&branch->remote_name, key, value);
460	} else if (!strcmp(subkey, "pushremote")) {
461	FREE_AND_NULL(branch->pushremote_name);
462	return git_config_string(&branch->pushremote_name, key, value);
463	} else if (!strcmp(subkey, "merge")) {
464	if (!value)
465	return config_error_nonbool(key);
466	add_merge(branch, value);
467	}
468	return 0;
469	}
470	if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
471	struct rewrite *rewrite;
472	if (!name)
473	return 0;
474	if (!strcmp(subkey, "insteadof")) {
475	if (!value)
476	return config_error_nonbool(key);
477	rewrite = make_rewrite(&remote_state->rewrites, name,
478	namelen);
479	add_instead_of(rewrite, xstrdup(value));
480	} else if (!strcmp(subkey, "pushinsteadof")) {
481	if (!value)
482	return config_error_nonbool(key);
483	rewrite = make_rewrite(&remote_state->rewrites_push,
484	name, namelen);
485	add_instead_of(rewrite, xstrdup(value));
486	}
487	}
488
489	if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
490	return 0;
491
492	/* Handle remote.* variables */
493	if (!name && !strcmp(subkey, "pushdefault")) {
494	FREE_AND_NULL(remote_state->pushremote_name);
495	return git_config_string(&remote_state->pushremote_name, key,
496	value);
497	}
498
499	if (!name)
500	return 0;
501	/* Handle remote.<name>.* variables */
502	if (*name == '/') {
503	warning(_("config remote shorthand cannot begin with '/': %s"),
504	name);
505	return 0;
506	}
507	remote = make_remote(remote_state, name, namelen);
508	remote->origin = REMOTE_CONFIG;
509	if (kvi->scope == CONFIG_SCOPE_LOCAL \|\|
510	kvi->scope == CONFIG_SCOPE_WORKTREE)
511	remote->configured_in_repo = 1;
512	if (!strcmp(subkey, "mirror"))
513	remote->mirror = git_config_bool(key, value);
514	else if (!strcmp(subkey, "skipdefaultupdate"))
515	remote->skip_default_update = git_config_bool(key, value);
516	else if (!strcmp(subkey, "skipfetchall"))
517	remote->skip_default_update = git_config_bool(key, value);
518	else if (!strcmp(subkey, "prune"))
519	remote->prune = git_config_bool(key, value);
520	else if (!strcmp(subkey, "prunetags"))
521	remote->prune_tags = git_config_bool(key, value);
522	else if (!strcmp(subkey, "url")) {
523	if (!value)
524	return config_error_nonbool(key);
525	add_url(remote, value);
526	} else if (!strcmp(subkey, "pushurl")) {
527	if (!value)
528	return config_error_nonbool(key);
529	add_pushurl(remote, value);
530	} else if (!strcmp(subkey, "push")) {
531	char *v;
532	if (git_config_string(&v, key, value))
533	return -1;
534	refspec_append(&remote->push, v);
535	free(v);
536	} else if (!strcmp(subkey, "fetch")) {
537	char *v;
538	if (git_config_string(&v, key, value))
539	return -1;
540	refspec_append(&remote->fetch, v);
541	free(v);
542	} else if (!strcmp(subkey, "receivepack")) {
543	char *v;
544	if (git_config_string(&v, key, value))
545	return -1;
546	if (!remote->receivepack)
547	remote->receivepack = v;
548	else
549	error(_("more than one receivepack given, using the first"));
550	} else if (!strcmp(subkey, "uploadpack")) {
551	char *v;
552	if (git_config_string(&v, key, value))
553	return -1;
554	if (!remote->uploadpack)
555	remote->uploadpack = v;
556	else
557	error(_("more than one uploadpack given, using the first"));
558	} else if (!strcmp(subkey, "tagopt")) {
559	if (!strcmp(value, "--no-tags"))
560	remote->fetch_tags = -1;
561	else if (!strcmp(value, "--tags"))
562	remote->fetch_tags = 2;
563	} else if (!strcmp(subkey, "proxy")) {
564	FREE_AND_NULL(remote->http_proxy);
565	return git_config_string(&remote->http_proxy,
566	key, value);
567	} else if (!strcmp(subkey, "proxyauthmethod")) {
568	FREE_AND_NULL(remote->http_proxy_authmethod);
569	return git_config_string(&remote->http_proxy_authmethod,
570	key, value);
571	} else if (!strcmp(subkey, "vcs")) {
572	FREE_AND_NULL(remote->foreign_vcs);
573	return git_config_string(&remote->foreign_vcs, key, value);
574	} else if (!strcmp(subkey, "serveroption")) {
575	return parse_transport_option(key, value,
576	&remote->server_options);
577	} else if (!strcmp(subkey, "negotiationrestrict")) {
578	return parse_transport_option(key, value,
579	&remote->negotiation_restrict);
580	} else if (!strcmp(subkey, "negotiationinclude")) {
581	return parse_transport_option(key, value,
582	&remote->negotiation_include);
583	} else if (!strcmp(subkey, "followremotehead")) {
584	const char *no_warn_branch;
585	if (!strcmp(value, "never"))
586	remote->follow_remote_head = FOLLOW_REMOTE_NEVER;
587	else if (!strcmp(value, "create"))
588	remote->follow_remote_head = FOLLOW_REMOTE_CREATE;
589	else if (!strcmp(value, "warn")) {
590	remote->follow_remote_head = FOLLOW_REMOTE_WARN;
591	remote->no_warn_branch = NULL;
592	} else if (skip_prefix(value, "warn-if-not-", &no_warn_branch)) {
593	remote->follow_remote_head = FOLLOW_REMOTE_WARN;
594	remote->no_warn_branch = no_warn_branch;
595	} else if (!strcmp(value, "always")) {
596	remote->follow_remote_head = FOLLOW_REMOTE_ALWAYS;
597	} else {
598	warning(_("unrecognized followRemoteHEAD value '%s' ignored"),
599	value);
600	}
601	}
602	return 0;
603	}
604
605	static void alias_all_urls(struct remote_state *remote_state)
606	{
607	int i, j;
608	for (i = 0; i < remote_state->remotes_nr; i++) {
609	int add_pushurl_aliases;
610	if (!remote_state->remotes[i])
611	continue;
612	for (j = 0; j < remote_state->remotes[i]->pushurl.nr; j++) {
613	char *alias = alias_url(remote_state->remotes[i]->pushurl.v[j],
614	&remote_state->rewrites);
615	if (alias)
616	strvec_replace(&remote_state->remotes[i]->pushurl,
617	j, alias);
618	free(alias);
619	}
620	add_pushurl_aliases = remote_state->remotes[i]->pushurl.nr == 0;
621	for (j = 0; j < remote_state->remotes[i]->url.nr; j++) {
622	char *alias;
623	if (add_pushurl_aliases)
624	add_pushurl_alias(
625	remote_state, remote_state->remotes[i],
626	remote_state->remotes[i]->url.v[j]);
627	alias = alias_url(remote_state->remotes[i]->url.v[j],
628	&remote_state->rewrites);
629	if (alias)
630	strvec_replace(&remote_state->remotes[i]->url,
631	j, alias);
632	free(alias);
633	}
634	}
635	}
636
637	static void read_config(struct repository *repo, int early)
638	{
639	int flag;
640
641	if (repo->remote_state->initialized)
642	return;
643	repo->remote_state->initialized = 1;
644
645	repo->remote_state->current_branch = NULL;
646	if (startup_info->have_repository && !early) {
647	const char *head_ref = refs_resolve_ref_unsafe(
648	get_main_ref_store(repo), "HEAD", 0, NULL, &flag);
649	if (head_ref && (flag & REF_ISSYMREF) &&
650	skip_prefix(head_ref, "refs/heads/", &head_ref)) {
651	repo->remote_state->current_branch = make_branch(
652	repo->remote_state, head_ref, strlen(head_ref));
653	}
654	}
655	repo_config(repo, handle_config, repo->remote_state);
656	alias_all_urls(repo->remote_state);
657	}
658
659	#ifndef WITH_BREAKING_CHANGES
660	static int valid_remote_nick(const char *name)
661	{
662	if (!name[0] \|\| is_dot_or_dotdot(name))
663	return 0;
664
665	/* remote nicknames cannot contain slashes */
666	while (*name)
667	if (is_dir_sep(*name++))
668	return 0;
669	return 1;
670	}
671	#endif /* WITH_BREAKING_CHANGES */
672
673	static const char remotes_remote_for_branch(struct remote_state remote_state,
674	struct branch *branch,
675	int *explicit)
676	{
677	if (branch && branch->remote_name) {
678	if (explicit)
679	*explicit = 1;
680	return branch->remote_name;
681	}
682	if (explicit)
683	*explicit = 0;
684	if (remote_state->remotes_nr == 1)
685	return remote_state->remotes[0]->name;
686	return "origin";
687	}
688
689	const char remote_for_branch(struct branch branch, int *explicit)
690	{
691	read_config(the_repository, 0);
692	die_on_missing_branch(the_repository, branch);
693
694	return remotes_remote_for_branch(the_repository->remote_state, branch,
695	explicit);
696	}
697
698	static const char *
699	remotes_pushremote_for_branch(struct remote_state *remote_state,
700	struct branch branch, int explicit)
701	{
702	if (branch && branch->pushremote_name) {
703	if (explicit)
704	*explicit = 1;
705	return branch->pushremote_name;
706	}
707	if (remote_state->pushremote_name) {
708	if (explicit)
709	*explicit = 1;
710	return remote_state->pushremote_name;
711	}
712	return remotes_remote_for_branch(remote_state, branch, explicit);
713	}
714
715	const char pushremote_for_branch(struct branch branch, int *explicit)
716	{
717	read_config(the_repository, 0);
718	die_on_missing_branch(the_repository, branch);
719
720	return remotes_pushremote_for_branch(the_repository->remote_state,
721	branch, explicit);
722	}
723
724	static struct remote remotes_remote_get(struct repository repo,
725	const char *name);
726
727	char remote_ref_for_branch(struct branch branch, int for_push)
728	{
729	read_config(the_repository, 0);
730	die_on_missing_branch(the_repository, branch);
731
732	if (branch) {
733	if (!for_push) {
734	if (branch->merge_nr) {
735	return xstrdup(branch->merge[0]->src);
736	}
737	} else {
738	char *dst;
739	const char *remote_name = remotes_pushremote_for_branch(
740	the_repository->remote_state, branch,
741	NULL);
742	struct remote *remote = remotes_remote_get(
743	the_repository, remote_name);
744
745	if (remote && remote->push.nr &&
746	(dst = apply_refspecs(&remote->push,
747	branch->refname))) {
748	return dst;
749	}
750	}
751	}
752	return NULL;
753	}
754
755	static void validate_remote_url(struct remote *remote)
756	{
757	int i;
758	const char *value;
759	struct strbuf redacted = STRBUF_INIT;
760	int warn_not_die;
761
762	if (repo_config_get_string_tmp(the_repository, "transfer.credentialsinurl", &value))
763	return;
764
765	if (!strcmp("warn", value))
766	warn_not_die = 1;
767	else if (!strcmp("die", value))
768	warn_not_die = 0;
769	else if (!strcmp("allow", value))
770	return;
771	else
772	die(_("unrecognized value transfer.credentialsInUrl: '%s'"), value);
773
774	for (i = 0; i < remote->url.nr; i++) {
775	struct url_info url_info = { 0 };
776
777	if (!url_normalize(remote->url.v[i], &url_info) \|\|
778	!url_info.passwd_off)
779	goto loop_cleanup;
780
781	strbuf_reset(&redacted);
782	strbuf_add(&redacted, url_info.url, url_info.passwd_off);
783	strbuf_addstr(&redacted, "<redacted>");
784	strbuf_addstr(&redacted,
785	url_info.url + url_info.passwd_off + url_info.passwd_len);
786
787	if (warn_not_die)
788	warning(_("URL '%s' uses plaintext credentials"), redacted.buf);
789	else
790	die(_("URL '%s' uses plaintext credentials"), redacted.buf);
791
792	loop_cleanup:
793	free(url_info.url);
794	}
795
796	strbuf_release(&redacted);
797	}
798
799	static struct remote *
800	remotes_remote_get_1(struct repository repo, const char name,
801	const char (get_default)(struct remote_state *,
802	struct branch , int ))
803	{
804	struct remote_state *remote_state = repo->remote_state;
805	struct remote *ret;
806	int name_given = 0;
807
808	if (name)
809	name_given = 1;
810	else
811	name = get_default(remote_state, remote_state->current_branch,
812	&name_given);
813
814	ret = make_remote(remote_state, name, 0);
815	#ifndef WITH_BREAKING_CHANGES
816	if (valid_remote_nick(name) && have_git_dir()) {
817	if (!valid_remote(ret))
818	read_remotes_file(repo, ret);
819	if (!valid_remote(ret))
820	read_branches_file(repo, ret);
821	}
822	#endif /* WITH_BREAKING_CHANGES */
823	if (name_given && !valid_remote(ret))
824	add_url_alias(remote_state, ret, name);
825	if (!valid_remote(ret))
826	return NULL;
827
828	validate_remote_url(ret);
829
830	return ret;
831	}
832
833	static inline struct remote *
834	remotes_remote_get(struct repository repo, const char name)
835	{
836	return remotes_remote_get_1(repo, name, remotes_remote_for_branch);
837	}
838
839	struct remote remote_get(const char name)
840	{
841	read_config(the_repository, 0);
842	return remotes_remote_get(the_repository, name);
843	}
844
845	struct remote remote_get_early(const char name)
846	{
847	read_config(the_repository, 1);
848	return remotes_remote_get(the_repository, name);
849	}
850
851	static inline struct remote *
852	remotes_pushremote_get(struct repository repo, const char name)
853	{
854	return remotes_remote_get_1(repo, name, remotes_pushremote_for_branch);
855	}
856
857	struct remote pushremote_get(const char name)
858	{
859	read_config(the_repository, 0);
860	return remotes_pushremote_get(the_repository, name);
861	}
862
863	int remote_is_configured(struct remote *remote, int in_repo)
864	{
865	if (!remote)
866	return 0;
867	if (in_repo)
868	return remote->configured_in_repo;
869	return !!remote->origin;
870	}
871
872	int for_each_remote(each_remote_fn fn, void *priv)
873	{
874	int i, result = 0;
875	read_config(the_repository, 0);
876	for (i = 0; i < the_repository->remote_state->remotes_nr && !result;
877	i++) {
878	struct remote *remote =
879	the_repository->remote_state->remotes[i];
880	if (!remote)
881	continue;
882	result = fn(remote, priv);
883	}
884	return result;
885	}
886
887	static void handle_duplicate(struct ref ref1, struct ref ref2)
888	{
889	if (strcmp(ref1->name, ref2->name)) {
890	if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
891	ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
892	die(_("Cannot fetch both %s and %s to %s"),
893	ref1->name, ref2->name, ref2->peer_ref->name);
894	} else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
895	ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
896	warning(_("%s usually tracks %s, not %s"),
897	ref2->peer_ref->name, ref2->name, ref1->name);
898	} else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
899	ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
900	die(_("%s tracks both %s and %s"),
901	ref2->peer_ref->name, ref1->name, ref2->name);
902	} else {
903	/*
904	* This last possibility doesn't occur because
905	* FETCH_HEAD_IGNORE entries always appear at
906	* the end of the list.
907	*/
908	BUG("Internal error");
909	}
910	}
911	free(ref2->peer_ref);
912	free(ref2);
913	}
914
915	struct ref ref_remove_duplicates(struct ref ref_map)
916	{
917	struct string_list refs = STRING_LIST_INIT_NODUP;
918	struct ref *retval = NULL;
919	struct ref **p = &retval;
920
921	while (ref_map) {
922	struct ref *ref = ref_map;
923
924	ref_map = ref_map->next;
925	ref->next = NULL;
926
927	if (!ref->peer_ref) {
928	*p = ref;
929	p = &ref->next;
930	} else {
931	struct string_list_item *item =
932	string_list_insert(&refs, ref->peer_ref->name);
933
934	if (item->util) {
935	/* Entry already existed */
936	handle_duplicate((struct ref *)item->util, ref);
937	} else {
938	*p = ref;
939	p = &ref->next;
940	item->util = ref;
941	}
942	}
943	}
944
945	string_list_clear(&refs, 0);
946	return retval;
947	}
948
949	int remote_has_url(struct remote remote, const char url)
950	{
951	int i;
952	for (i = 0; i < remote->url.nr; i++) {
953	if (!strcmp(remote->url.v[i], url))
954	return 1;
955	}
956	return 0;
957	}
958
959	struct strvec push_url_of_remote(struct remote remote)
960	{
961	return remote->pushurl.nr ? &remote->pushurl : &remote->url;
962	}
963
964	static bool remote_has_push_url(struct remote remote, const char url)
965	{
966	const struct strvec *push_urls = push_url_of_remote(remote);
967
968	for (size_t i = 0; i < push_urls->nr; i++) {
969	if (!strcmp(push_urls->v[i], url))
970	return true;
971	}
972	return false;
973	}
974
975	void ref_push_report_free(struct ref_push_report *report)
976	{
977	while (report) {
978	struct ref_push_report *next = report->next;
979
980	free(report->ref_name);
981	free(report->old_oid);
982	free(report->new_oid);
983	free(report);
984
985	report = next;
986	}
987	}
988
989	int remote_find_tracking(struct remote remote, struct refspec_item refspec)
990	{
991	return refspec_find_match(&remote->fetch, refspec);
992	}
993
994	static struct ref alloc_ref_with_prefix(const char prefix, size_t prefixlen,
995	const char *name)
996	{
997	size_t len = strlen(name);
998	struct ref ref = xcalloc(1, st_add4(sizeof(ref), prefixlen, len, 1));
999	memcpy(ref->name, prefix, prefixlen);
1000	memcpy(ref->name + prefixlen, name, len);
1001	return ref;
1002	}
1003
1004	struct ref alloc_ref(const char name)
1005	{
1006	return alloc_ref_with_prefix("", 0, name);
1007	}
1008
1009	struct ref copy_ref(const struct ref ref)
1010	{
1011	struct ref *cpy;
1012	size_t len;
1013	if (!ref)
1014	return NULL;
1015	len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
1016	cpy = xmalloc(len);
1017	memcpy(cpy, ref, len);
1018	cpy->next = NULL;
1019	cpy->symref = xstrdup_or_null(ref->symref);
1020	cpy->remote_status = xstrdup_or_null(ref->remote_status);
1021	cpy->peer_ref = copy_ref(ref->peer_ref);
1022	return cpy;
1023	}
1024
1025	struct ref copy_ref_list(const struct ref ref)
1026	{
1027	struct ref *ret = NULL;
1028	struct ref **tail = &ret;
1029	while (ref) {
1030	*tail = copy_ref(ref);
1031	ref = ref->next;
1032	tail = &((*tail)->next);
1033	}
1034	return ret;
1035	}
1036
1037	void free_one_ref(struct ref *ref)
1038	{
1039	if (!ref)
1040	return;
1041	free_one_ref(ref->peer_ref);
1042	ref_push_report_free(ref->report);
1043	free(ref->remote_status);
1044	free(ref->tracking_ref);
1045	free(ref->symref);
1046	free(ref);
1047	}
1048
1049	void free_refs(struct ref *ref)
1050	{
1051	struct ref *next;
1052	while (ref) {
1053	next = ref->next;
1054	free_one_ref(ref);
1055	ref = next;
1056	}
1057	}
1058
1059	int count_refspec_match(const char *pattern,
1060	struct ref *refs,
1061	struct ref **matched_ref)
1062	{
1063	int patlen = strlen(pattern);
1064	struct ref *matched_weak = NULL;
1065	struct ref *matched = NULL;
1066	int weak_match = 0;
1067	int match = 0;
1068
1069	for (weak_match = match = 0; refs; refs = refs->next) {
1070	char *name = refs->name;
1071	int namelen = strlen(name);
1072
1073	if (!refname_match(pattern, name))
1074	continue;
1075
1076	/* A match is "weak" if it is with refs outside
1077	* heads or tags, and did not specify the pattern
1078	* in full (e.g. "refs/remotes/origin/master") or at
1079	* least from the toplevel (e.g. "remotes/origin/master");
1080	* otherwise "git push $URL master" would result in
1081	* ambiguity between remotes/origin/master and heads/master
1082	* at the remote site.
1083	*/
1084	if (namelen != patlen &&
1085	patlen != namelen - 5 &&
1086	!starts_with(name, "refs/heads/") &&
1087	!starts_with(name, "refs/tags/")) {
1088	/* We want to catch the case where only weak
1089	* matches are found and there are multiple
1090	* matches, and where more than one strong
1091	* matches are found, as ambiguous. One
1092	* strong match with zero or more weak matches
1093	* are acceptable as a unique match.
1094	*/
1095	matched_weak = refs;
1096	weak_match++;
1097	}
1098	else {
1099	matched = refs;
1100	match++;
1101	}
1102	}
1103	if (!matched) {
1104	if (matched_ref)
1105	*matched_ref = matched_weak;
1106	return weak_match;
1107	}
1108	else {
1109	if (matched_ref)
1110	*matched_ref = matched;
1111	return match;
1112	}
1113	}
1114
1115	void tail_link_ref(struct ref ref, struct ref **tail)
1116	{
1117	**tail = ref;
1118	while (ref->next)
1119	ref = ref->next;
1120	*tail = &ref->next;
1121	}
1122
1123	static struct ref *alloc_delete_ref(void)
1124	{
1125	struct ref *ref = alloc_ref("(delete)");
1126	oidclr(&ref->new_oid, the_repository->hash_algo);
1127	return ref;
1128	}
1129
1130	static int try_explicit_object_name(const char *name,
1131	struct ref **match)
1132	{
1133	struct object_id oid;
1134
1135	if (!*name) {
1136	if (match)
1137	*match = alloc_delete_ref();
1138	return 0;
1139	}
1140
1141	if (repo_get_oid(the_repository, name, &oid))
1142	return -1;
1143
1144	if (match) {
1145	*match = alloc_ref(name);
1146	oidcpy(&(*match)->new_oid, &oid);
1147	}
1148	return 0;
1149	}
1150
1151	static struct ref make_linked_ref(const char name, struct ref ***tail)
1152	{
1153	struct ref *ret = alloc_ref(name);
1154	tail_link_ref(ret, tail);
1155	return ret;
1156	}
1157
1158	static char guess_ref(const char name, struct ref *peer)
1159	{
1160	struct strbuf buf = STRBUF_INIT;
1161
1162	const char *r = refs_resolve_ref_unsafe(get_main_ref_store(the_repository),
1163	peer->name,
1164	RESOLVE_REF_READING,
1165	NULL, NULL);
1166	if (!r)
1167	return NULL;
1168
1169	if (starts_with(r, "refs/heads/")) {
1170	strbuf_addstr(&buf, "refs/heads/");
1171	} else if (starts_with(r, "refs/tags/")) {
1172	strbuf_addstr(&buf, "refs/tags/");
1173	} else {
1174	return NULL;
1175	}
1176
1177	strbuf_addstr(&buf, name);
1178	return strbuf_detach(&buf, NULL);
1179	}
1180
1181	static int match_explicit_lhs(struct ref *src,
1182	struct refspec_item *rs,
1183	struct ref **match,
1184	int *allocated_match)
1185	{
1186	switch (count_refspec_match(rs->src, src, match)) {
1187	case 1:
1188	if (allocated_match)
1189	*allocated_match = 0;
1190	return 0;
1191	case 0:
1192	/* The source could be in the get_sha1() format
1193	* not a reference name. :refs/other is a
1194	* way to delete 'other' ref at the remote end.
1195	*/
1196	if (try_explicit_object_name(rs->src, match) < 0)
1197	return error(_("src refspec %s does not match any"), rs->src);
1198	if (allocated_match)
1199	*allocated_match = 1;
1200	return 0;
1201	default:
1202	return error(_("src refspec %s matches more than one"), rs->src);
1203	}
1204	}
1205
1206	static void show_push_unqualified_ref_name_error(const char *dst_value,
1207	const char *matched_src_name)
1208	{
1209	struct object_id oid;
1210
1211	/*
1212	* TRANSLATORS: "matches '%s'%" is the <dst> part of "git push
1213	* <remote> <src>:<dst>" push, and "being pushed ('%s')" is
1214	* the <src>.
1215	*/
1216	error(_("The destination you provided is not a full refname (i.e.,\n"
1217	"starting with \"refs/\"). We tried to guess what you meant by:\n"
1218	"\n"
1219	"- Looking for a ref that matches '%s' on the remote side.\n"
1220	"- Checking if the <src> being pushed ('%s')\n"
1221	" is a ref in \"refs/{heads,tags}/\". If so we add a corresponding\n"
1222	" refs/{heads,tags}/ prefix on the remote side.\n"
1223	"\n"
1224	"Neither worked, so we gave up. You must fully qualify the ref."),
1225	dst_value, matched_src_name);
1226
1227	if (!advice_enabled(ADVICE_PUSH_UNQUALIFIED_REF_NAME))
1228	return;
1229
1230	if (repo_get_oid(the_repository, matched_src_name, &oid))
1231	BUG("'%s' is not a valid object, "
1232	"match_explicit_lhs() should catch this!",
1233	matched_src_name);
1234
1235	switch (odb_read_object_info(the_repository->objects, &oid, NULL)) {
1236	case OBJ_COMMIT:
1237	advise(_("The <src> part of the refspec is a commit object.\n"
1238	"Did you mean to create a new branch by pushing to\n"
1239	"'%s:refs/heads/%s'?"),
1240	matched_src_name, dst_value);
1241	break;
1242	case OBJ_TAG:
1243	advise(_("The <src> part of the refspec is a tag object.\n"
1244	"Did you mean to create a new tag by pushing to\n"
1245	"'%s:refs/tags/%s'?"),
1246	matched_src_name, dst_value);
1247	break;
1248	case OBJ_TREE:
1249	advise(_("The <src> part of the refspec is a tree object.\n"
1250	"Did you mean to tag a new tree by pushing to\n"
1251	"'%s:refs/tags/%s'?"),
1252	matched_src_name, dst_value);
1253	break;
1254	case OBJ_BLOB:
1255	advise(_("The <src> part of the refspec is a blob object.\n"
1256	"Did you mean to tag a new blob by pushing to\n"
1257	"'%s:refs/tags/%s'?"),
1258	matched_src_name, dst_value);
1259	break;
1260	default:
1261	advise(_("The <src> part of the refspec ('%s') "
1262	"is an object ID that doesn't exist.\n"),
1263	matched_src_name);
1264	break;
1265	}
1266	}
1267
1268	static int match_explicit(struct ref src, struct ref dst,
1269	struct ref ***dst_tail,
1270	struct refspec_item *rs)
1271	{
1272	struct ref matched_src = NULL, matched_dst = NULL;
1273	int allocated_src = 0, ret;
1274
1275	const char *dst_value = rs->dst;
1276	char *dst_guess;
1277
1278	if (rs->pattern \|\| rs->matching \|\| rs->negative) {
1279	ret = 0;
1280	goto out;
1281	}
1282
1283	if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0) {
1284	ret = -1;
1285	goto out;
1286	}
1287
1288	if (!dst_value) {
1289	int flag;
1290
1291	dst_value = refs_resolve_ref_unsafe(get_main_ref_store(the_repository),
1292	matched_src->name,
1293	RESOLVE_REF_READING,
1294	NULL, &flag);
1295	if (!dst_value \|\|
1296	((flag & REF_ISSYMREF) &&
1297	!starts_with(dst_value, "refs/heads/")))
1298	die(_("%s cannot be resolved to branch"),
1299	matched_src->name);
1300	}
1301
1302	switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1303	case 1:
1304	break;
1305	case 0:
1306	if (starts_with(dst_value, "refs/")) {
1307	matched_dst = make_linked_ref(dst_value, dst_tail);
1308	} else if (is_null_oid(&matched_src->new_oid)) {
1309	error(_("unable to delete '%s': remote ref does not exist"),
1310	dst_value);
1311	} else if ((dst_guess = guess_ref(dst_value, matched_src))) {
1312	matched_dst = make_linked_ref(dst_guess, dst_tail);
1313	free(dst_guess);
1314	} else {
1315	show_push_unqualified_ref_name_error(dst_value,
1316	matched_src->name);
1317	}
1318	break;
1319	default:
1320	matched_dst = NULL;
1321	error(_("dst refspec %s matches more than one"),
1322	dst_value);
1323	break;
1324	}
1325
1326	if (!matched_dst) {
1327	ret = -1;
1328	goto out;
1329	}
1330
1331	if (matched_dst->peer_ref) {
1332	ret = error(_("dst ref %s receives from more than one src"),
1333	matched_dst->name);
1334	goto out;
1335	} else {
1336	matched_dst->peer_ref = allocated_src ?
1337	matched_src :
1338	copy_ref(matched_src);
1339	matched_dst->force = rs->force;
1340	matched_src = NULL;
1341	}
1342
1343	ret = 0;
1344
1345	out:
1346	if (allocated_src)
1347	free_one_ref(matched_src);
1348	return ret;
1349	}
1350
1351	static int match_explicit_refs(struct ref src, struct ref dst,
1352	struct ref **dst_tail, struct refspec rs)
1353	{
1354	int i, errs;
1355	for (i = errs = 0; i < rs->nr; i++)
1356	errs += match_explicit(src, dst, dst_tail, &rs->items[i]);
1357	return errs;
1358	}
1359
1360	static char get_ref_match(const struct refspec rs, const struct ref *ref,
1361	int send_mirror, int direction,
1362	const struct refspec_item **ret_pat)
1363	{
1364	const struct refspec_item *pat;
1365	char *name;
1366	int i;
1367	int matching_refs = -1;
1368	for (i = 0; i < rs->nr; i++) {
1369	const struct refspec_item *item = &rs->items[i];
1370
1371	if (item->negative)
1372	continue;
1373
1374	if (item->matching &&
1375	(matching_refs == -1 \|\| item->force)) {
1376	matching_refs = i;
1377	continue;
1378	}
1379
1380	if (item->pattern) {
1381	const char *dst_side = item->dst ? item->dst : item->src;
1382	int match;
1383	if (direction == FROM_SRC)
1384	match = match_refname_with_pattern(item->src, ref->name, dst_side, &name);
1385	else
1386	match = match_refname_with_pattern(dst_side, ref->name, item->src, &name);
1387	if (match) {
1388	matching_refs = i;
1389	break;
1390	}
1391	}
1392	}
1393	if (matching_refs == -1)
1394	return NULL;
1395
1396	pat = &rs->items[matching_refs];
1397	if (pat->matching) {
1398	/*
1399	* "matching refs"; traditionally we pushed everything
1400	* including refs outside refs/heads/ hierarchy, but
1401	* that does not make much sense these days.
1402	*/
1403	if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1404	return NULL;
1405	name = xstrdup(ref->name);
1406	}
1407	if (ret_pat)
1408	*ret_pat = pat;
1409	return name;
1410	}
1411
1412	static struct ref tail_ref(struct ref head)
1413	{
1414	struct ref **tail = head;
1415	while (*tail)
1416	tail = &((*tail)->next);
1417	return tail;
1418	}
1419
1420	static void add_to_tips(struct commit_stack tips, const struct object_id oid)
1421	{
1422	struct commit *commit;
1423
1424	if (is_null_oid(oid))
1425	return;
1426	commit = lookup_commit_reference_gently(the_repository, oid, 1);
1427	if (!commit \|\| (commit->object.flags & TMP_MARK))
1428	return;
1429	commit->object.flags \|= TMP_MARK;
1430	commit_stack_push(tips, commit);
1431	}
1432
1433	static void add_missing_tags(struct ref src, struct ref dst, struct ref **dst_tail)
1434	{
1435	struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1436	struct string_list src_tag = STRING_LIST_INIT_NODUP;
1437	struct string_list_item *item;
1438	struct ref *ref;
1439	struct commit_stack sent_tips = COMMIT_STACK_INIT;
1440
1441	/*
1442	* Collect everything we know they would have at the end of
1443	* this push, and collect all tags they have.
1444	*/
1445	for (ref = *dst; ref; ref = ref->next) {
1446	if (ref->peer_ref &&
1447	!is_null_oid(&ref->peer_ref->new_oid))
1448	add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1449	else
1450	add_to_tips(&sent_tips, &ref->old_oid);
1451	if (starts_with(ref->name, "refs/tags/"))
1452	string_list_append(&dst_tag, ref->name);
1453	}
1454	clear_commit_marks_many(sent_tips.nr, sent_tips.items, TMP_MARK);
1455
1456	string_list_sort(&dst_tag);
1457
1458	/* Collect tags they do not have. */
1459	for (ref = src; ref; ref = ref->next) {
1460	if (!starts_with(ref->name, "refs/tags/"))
1461	continue; /* not a tag */
1462	if (string_list_has_string(&dst_tag, ref->name))
1463	continue; /* they already have it */
1464	if (odb_read_object_info(the_repository->objects,
1465	&ref->new_oid, NULL) != OBJ_TAG)
1466	continue; /* be conservative */
1467	item = string_list_append(&src_tag, ref->name);
1468	item->util = ref;
1469	}
1470	string_list_clear(&dst_tag, 0);
1471
1472	/*
1473	* At this point, src_tag lists tags that are missing from
1474	* dst, and sent_tips lists the tips we are pushing or those
1475	* that we know they already have. An element in the src_tag
1476	* that is an ancestor of any of the sent_tips needs to be
1477	* sent to the other side.
1478	*/
1479	if (sent_tips.nr) {
1480	const int reachable_flag = 1;
1481	struct commit_list *found_commits;
1482	struct commit_stack src_commits = COMMIT_STACK_INIT;
1483
1484	for_each_string_list_item(item, &src_tag) {
1485	struct ref *ref = item->util;
1486	struct commit *commit;
1487
1488	if (is_null_oid(&ref->new_oid))
1489	continue;
1490	commit = lookup_commit_reference_gently(the_repository,
1491	&ref->new_oid,
1492	1);
1493	if (!commit)
1494	/* not pushing a commit, which is not an error */
1495	continue;
1496
1497	commit_stack_push(&src_commits, commit);
1498	}
1499
1500	found_commits = get_reachable_subset(sent_tips.items,
1501	sent_tips.nr,
1502	src_commits.items,
1503	src_commits.nr,
1504	reachable_flag);
1505
1506	for_each_string_list_item(item, &src_tag) {
1507	struct ref *dst_ref;
1508	struct ref *ref = item->util;
1509	struct commit *commit;
1510
1511	if (is_null_oid(&ref->new_oid))
1512	continue;
1513	commit = lookup_commit_reference_gently(the_repository,
1514	&ref->new_oid,
1515	1);
1516	if (!commit)
1517	/* not pushing a commit, which is not an error */
1518	continue;
1519
1520	/*
1521	* Is this tag, which they do not have, reachable from
1522	* any of the commits we are sending?
1523	*/
1524	if (!(commit->object.flags & reachable_flag))
1525	continue;
1526
1527	/* Add it in */
1528	dst_ref = make_linked_ref(ref->name, dst_tail);
1529	oidcpy(&dst_ref->new_oid, &ref->new_oid);
1530	dst_ref->peer_ref = copy_ref(ref);
1531	}
1532
1533	clear_commit_marks_many(src_commits.nr, src_commits.items,
1534	reachable_flag);
1535	commit_stack_clear(&src_commits);
1536	commit_list_free(found_commits);
1537	}
1538
1539	string_list_clear(&src_tag, 0);
1540	commit_stack_clear(&sent_tips);
1541	}
1542
1543	struct ref find_ref_by_name(const struct ref list, const char *name)
1544	{
1545	for ( ; list; list = list->next)
1546	if (!strcmp(list->name, name))
1547	return (struct ref *)list;
1548	return NULL;
1549	}
1550
1551	static void prepare_ref_index(struct string_list ref_index, struct ref ref)
1552	{
1553	for ( ; ref; ref = ref->next)
1554	string_list_append_nodup(ref_index, ref->name)->util = ref;
1555
1556	string_list_sort(ref_index);
1557	}
1558
1559	/*
1560	* Given only the set of local refs, sanity-check the set of push
1561	* refspecs. We can't catch all errors that match_push_refs would,
1562	* but we can catch some errors early before even talking to the
1563	* remote side.
1564	*/
1565	int check_push_refs(struct ref src, struct refspec rs)
1566	{
1567	int ret = 0;
1568	int i;
1569
1570	for (i = 0; i < rs->nr; i++) {
1571	struct refspec_item *item = &rs->items[i];
1572
1573	if (item->pattern \|\| item->matching \|\| item->negative)
1574	continue;
1575
1576	ret \|= match_explicit_lhs(src, item, NULL, NULL);
1577	}
1578
1579	return ret;
1580	}
1581
1582	/*
1583	* Given the set of refs the local repository has, the set of refs the
1584	* remote repository has, and the refspec used for push, determine
1585	* what remote refs we will update and with what value by setting
1586	* peer_ref (which object is being pushed) and force (if the push is
1587	* forced) in elements of "dst". The function may add new elements to
1588	* dst (e.g. pushing to a new branch, done in match_explicit_refs).
1589	*/
1590	int match_push_refs(struct ref src, struct ref *dst,
1591	struct refspec *rs, int flags)
1592	{
1593	int send_all = flags & MATCH_REFS_ALL;
1594	int send_mirror = flags & MATCH_REFS_MIRROR;
1595	int send_prune = flags & MATCH_REFS_PRUNE;
1596	int errs;
1597	struct ref ref, *dst_tail = tail_ref(dst);
1598	struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1599
1600	/* If no refspec is provided, use the default ":" */
1601	if (!rs->nr)
1602	refspec_append(rs, ":");
1603
1604	errs = match_explicit_refs(src, *dst, &dst_tail, rs);
1605
1606	/* pick the remainder */
1607	for (ref = src; ref; ref = ref->next) {
1608	struct string_list_item *dst_item;
1609	struct ref *dst_peer;
1610	const struct refspec_item *pat = NULL;
1611	char *dst_name;
1612
1613	dst_name = get_ref_match(rs, ref, send_mirror, FROM_SRC, &pat);
1614	if (!dst_name)
1615	continue;
1616
1617	if (!dst_ref_index.nr)
1618	prepare_ref_index(&dst_ref_index, *dst);
1619
1620	dst_item = string_list_lookup(&dst_ref_index, dst_name);
1621	dst_peer = dst_item ? dst_item->util : NULL;
1622	if (dst_peer) {
1623	if (dst_peer->peer_ref)
1624	/* We're already sending something to this ref. */
1625	goto free_name;
1626	} else {
1627	if (pat->matching && !(send_all \|\| send_mirror))
1628	/*
1629	* Remote doesn't have it, and we have no
1630	* explicit pattern, and we don't have
1631	* --all or --mirror.
1632	*/
1633	goto free_name;
1634
1635	/* Create a new one and link it */
1636	dst_peer = make_linked_ref(dst_name, &dst_tail);
1637	oidcpy(&dst_peer->new_oid, &ref->new_oid);
1638	string_list_insert(&dst_ref_index,
1639	dst_peer->name)->util = dst_peer;
1640	}
1641	dst_peer->peer_ref = copy_ref(ref);
1642	dst_peer->force = pat->force;
1643	free_name:
1644	free(dst_name);
1645	}
1646
1647	string_list_clear(&dst_ref_index, 0);
1648
1649	if (flags & MATCH_REFS_FOLLOW_TAGS)
1650	add_missing_tags(src, dst, &dst_tail);
1651
1652	if (send_prune) {
1653	struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1654	/* check for missing refs on the remote */
1655	for (ref = *dst; ref; ref = ref->next) {
1656	char *src_name;
1657
1658	if (ref->peer_ref)
1659	/* We're already sending something to this ref. */
1660	continue;
1661
1662	src_name = get_ref_match(rs, ref, send_mirror, FROM_DST, NULL);
1663	if (src_name) {
1664	if (!src_ref_index.nr)
1665	prepare_ref_index(&src_ref_index, src);
1666	if (!string_list_has_string(&src_ref_index,
1667	src_name))
1668	ref->peer_ref = alloc_delete_ref();
1669	free(src_name);
1670	}
1671	}
1672	string_list_clear(&src_ref_index, 0);
1673	}
1674
1675	dst = apply_negative_refspecs(dst, rs);
1676
1677	if (errs)
1678	return -1;
1679	return 0;
1680	}
1681
1682	void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1683	int force_update)
1684	{
1685	struct ref *ref;
1686
1687	for (ref = remote_refs; ref; ref = ref->next) {
1688	int force_ref_update = ref->force \|\| force_update;
1689	int reject_reason = 0;
1690
1691	if (ref->peer_ref)
1692	oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1693	else if (!send_mirror)
1694	continue;
1695
1696	ref->deletion = is_null_oid(&ref->new_oid);
1697	if (!ref->deletion &&
1698	oideq(&ref->old_oid, &ref->new_oid)) {
1699	ref->status = REF_STATUS_UPTODATE;
1700	continue;
1701	}
1702
1703	/*
1704	* If the remote ref has moved and is now different
1705	* from what we expect, reject any push.
1706	*
1707	* It also is an error if the user told us to check
1708	* with the remote-tracking branch to find the value
1709	* to expect, but we did not have such a tracking
1710	* branch.
1711	*
1712	* If the tip of the remote-tracking ref is unreachable
1713	* from any reflog entry of its local ref indicating a
1714	* possible update since checkout; reject the push.
1715	*/
1716	if (ref->expect_old_sha1) {
1717	if (!oideq(&ref->old_oid, &ref->old_oid_expect))
1718	reject_reason = REF_STATUS_REJECT_STALE;
1719	else if (ref->check_reachable && ref->unreachable)
1720	reject_reason =
1721	REF_STATUS_REJECT_REMOTE_UPDATED;
1722	else
1723	/*
1724	* If the ref isn't stale, and is reachable
1725	* from one of the reflog entries of
1726	* the local branch, force the update.
1727	*/
1728	force_ref_update = 1;
1729	}
1730
1731	/*
1732	* If the update isn't already rejected then check
1733	* the usual "must fast-forward" rules.
1734	*
1735	* Decide whether an individual refspec A:B can be
1736	* pushed. The push will succeed if any of the
1737	* following are true:
1738	*
1739	* (1) the remote reference B does not exist
1740	*
1741	* (2) the remote reference B is being removed (i.e.,
1742	* pushing :B where no source is specified)
1743	*
1744	* (3) the destination is not under refs/tags/, and
1745	* if the old and new value is a commit, the new
1746	* is a descendant of the old.
1747	*
1748	* (4) it is forced using the +A:B notation, or by
1749	* passing the --force argument
1750	*/
1751
1752	if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1753	if (starts_with(ref->name, "refs/tags/"))
1754	reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1755	else if (!odb_has_object(the_repository->objects, &ref->old_oid, ODB_HAS_OBJECT_RECHECK_PACKED))
1756	reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1757	else if (!lookup_commit_reference_gently(the_repository, &ref->old_oid, 1) \|\|
1758	!lookup_commit_reference_gently(the_repository, &ref->new_oid, 1))
1759	reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1760	else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1761	reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1762	}
1763
1764	/*
1765	* "--force" will defeat any rejection implemented
1766	* by the rules above.
1767	*/
1768	if (!force_ref_update)
1769	ref->status = reject_reason;
1770	else if (reject_reason)
1771	ref->forced_update = 1;
1772	}
1773	}
1774
1775	static void set_merge(struct repository repo, struct branch ret)
1776	{
1777	struct remote *remote;
1778	char *ref;
1779	struct object_id oid;
1780	int i;
1781
1782	if (!ret)
1783	return; /* no branch */
1784	if (ret->set_merge)
1785	return; /* already run */
1786	if (!ret->remote_name \|\| !ret->merge_nr) {
1787	/*
1788	* no merge config; let's make sure we don't confuse callers
1789	* with a non-zero merge_nr but a NULL merge
1790	*/
1791	merge_clear(ret);
1792	return;
1793	}
1794	ret->set_merge = 1;
1795
1796	remote = remotes_remote_get(repo, ret->remote_name);
1797
1798	for (i = 0; i < ret->merge_nr; i++) {
1799	if (!remote_find_tracking(remote, ret->merge[i]) \|\|
1800	strcmp(ret->remote_name, "."))
1801	continue;
1802	if (repo_dwim_ref(repo, ret->merge[i]->src,
1803	strlen(ret->merge[i]->src), &oid, &ref,
1804	0) == 1)
1805	ret->merge[i]->dst = ref;
1806	else
1807	ret->merge[i]->dst = xstrdup(ret->merge[i]->src);
1808	}
1809	}
1810
1811	static struct branch repo_branch_get(struct repository repo, const char *name)
1812	{
1813	struct branch *ret;
1814
1815	read_config(repo, 0);
1816	if (!name \|\| !*name \|\| !strcmp(name, "HEAD"))
1817	ret = repo->remote_state->current_branch;
1818	else
1819	ret = make_branch(repo->remote_state, name,
1820	strlen(name));
1821	set_merge(repo, ret);
1822	return ret;
1823	}
1824
1825	struct branch branch_get(const char name)
1826	{
1827	return repo_branch_get(the_repository, name);
1828	}
1829
1830	const char repo_default_remote(struct repository repo)
1831	{
1832	struct branch *branch;
1833
1834	read_config(repo, 0);
1835	branch = repo_branch_get(repo, "HEAD");
1836
1837	return remotes_remote_for_branch(repo->remote_state, branch, NULL);
1838	}
1839
1840	const char repo_remote_from_url(struct repository repo, const char *url)
1841	{
1842	char *rewritten_url;
1843	const char *remote_name = NULL;
1844
1845	read_config(repo, 0);
1846	if ((rewritten_url = alias_url(url, &repo->remote_state->rewrites)))
1847	url = rewritten_url;
1848
1849	for (int i = 0; i < repo->remote_state->remotes_nr; i++) {
1850	struct remote *remote = repo->remote_state->remotes[i];
1851	if (!remote)
1852	continue;
1853
1854	if (remote_has_url(remote, url)) {
1855	remote_name = remote->name;
1856	break;
1857	}
1858	}
1859	free(rewritten_url);
1860	return remote_name;
1861	}
1862
1863	int branch_has_merge_config(struct branch *branch)
1864	{
1865	return branch && branch->set_merge;
1866	}
1867
1868	int branch_merge_matches(struct branch *branch,
1869	int i,
1870	const char *refname)
1871	{
1872	if (!branch \|\| i < 0 \|\| i >= branch->merge_nr)
1873	return 0;
1874	return refname_match(branch->merge[i]->src, refname);
1875	}
1876
1877	__attribute__((format (printf,2,3)))
1878	static char error_buf(struct strbuf err, const char *fmt, ...)
1879	{
1880	if (err) {
1881	va_list ap;
1882	va_start(ap, fmt);
1883	strbuf_vaddf(err, fmt, ap);
1884	va_end(ap);
1885	}
1886	return NULL;
1887	}
1888
1889	const char branch_get_upstream(struct branch branch, struct strbuf *err)
1890	{
1891	if (!branch)
1892	return error_buf(err, _("HEAD does not point to a branch"));
1893
1894	if (!branch->merge \|\| !branch->merge[0]) {
1895	/*
1896	* no merge config; is it because the user didn't define any,
1897	* or because it is not a real branch, and get_branch
1898	* auto-vivified it?
1899	*/
1900	if (!refs_ref_exists(get_main_ref_store(the_repository), branch->refname))
1901	return error_buf(err, _("no such branch: '%s'"),
1902	branch->name);
1903	return error_buf(err,
1904	_("no upstream configured for branch '%s'"),
1905	branch->name);
1906	}
1907
1908	if (!branch->merge[0]->dst)
1909	return error_buf(err,
1910	_("upstream branch '%s' not stored as a remote-tracking branch"),
1911	branch->merge[0]->src);
1912
1913	return branch->merge[0]->dst;
1914	}
1915
1916	struct remote repo_remote_for_push_tracking(struct repository repo,
1917	struct remote *remote)
1918	{
1919	const struct strvec *push_urls;
1920	struct remote *first_match = NULL;
1921	struct remote_state *remote_state = repo->remote_state;
1922	const char *check_url;
1923
1924	if (remote->origin != REMOTE_UNCONFIGURED)
1925	return remote;
1926
1927	push_urls = push_url_of_remote(remote);
1928	if (push_urls->nr != 1)
1929	return remote;
1930	check_url = push_urls->v[0];
1931
1932	for (int i = 0; i < remote_state->remotes_nr; i++) {
1933	struct remote *candidate = remote_state->remotes[i];
1934
1935	if (!candidate \|\| candidate == remote \|\|
1936	!remote_is_configured(candidate, 0) \|\|
1937	!remote_has_push_url(candidate, check_url))
1938	continue;
1939	if (first_match)
1940	return remote;
1941	first_match = candidate;
1942	}
1943
1944	return first_match ? first_match : remote;
1945	}
1946
1947	static char tracking_for_push_dest(struct repository repo,
1948	struct remote *remote,
1949	const char *refname,
1950	struct strbuf *err)
1951	{
1952	char *ret;
1953
1954	remote = repo_remote_for_push_tracking(repo, remote);
1955	ret = apply_refspecs(&remote->fetch, refname);
1956	if (!ret)
1957	return error_buf(err,
1958	_("push destination '%s' on remote '%s' has no local tracking branch"),
1959	refname, remote->name);
1960	return ret;
1961	}
1962
1963	static char branch_get_push_1(struct repository repo,
1964	struct branch branch, struct strbuf err)
1965	{
1966	struct remote_state *remote_state = repo->remote_state;
1967	struct remote *remote;
1968
1969	remote = remotes_remote_get(
1970	repo,
1971	remotes_pushremote_for_branch(remote_state, branch, NULL));
1972	if (!remote)
1973	return error_buf(err,
1974	_("branch '%s' has no remote for pushing"),
1975	branch->name);
1976
1977	if (remote->push.nr) {
1978	char *dst;
1979	char *ret;
1980
1981	dst = apply_refspecs(&remote->push, branch->refname);
1982	if (!dst)
1983	return error_buf(err,
1984	_("push refspecs for '%s' do not include '%s'"),
1985	remote->name, branch->name);
1986
1987	ret = tracking_for_push_dest(repo, remote, dst, err);
1988	free(dst);
1989	return ret;
1990	}
1991
1992	if (remote->mirror)
1993	return tracking_for_push_dest(repo, remote, branch->refname, err);
1994
1995	switch (repo_config_values(repo)->push_default) {
1996	case PUSH_DEFAULT_NOTHING:
1997	return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1998
1999	case PUSH_DEFAULT_MATCHING:
2000	case PUSH_DEFAULT_CURRENT:
2001	return tracking_for_push_dest(repo, remote, branch->refname, err);
2002
2003	case PUSH_DEFAULT_UPSTREAM:
2004	return xstrdup_or_null(branch_get_upstream(branch, err));
2005
2006	case PUSH_DEFAULT_UNSPECIFIED:
2007	case PUSH_DEFAULT_SIMPLE:
2008	{
2009	const char *up;
2010	char *cur;
2011
2012	up = branch_get_upstream(branch, err);
2013	if (!up)
2014	return NULL;
2015	cur = tracking_for_push_dest(repo, remote, branch->refname, err);
2016	if (!cur)
2017	return NULL;
2018	if (strcmp(cur, up)) {
2019	free(cur);
2020	return error_buf(err,
2021	_("cannot resolve 'simple' push to a single destination"));
2022	}
2023	return cur;
2024	}
2025	}
2026
2027	BUG("unhandled push situation");
2028	}
2029
2030	const char branch_get_push(struct branch branch, struct strbuf *err)
2031	{
2032	read_config(the_repository, 0);
2033	die_on_missing_branch(the_repository, branch);
2034
2035	if (!branch)
2036	return error_buf(err, _("HEAD does not point to a branch"));
2037
2038	if (!branch->push_tracking_ref)
2039	branch->push_tracking_ref = branch_get_push_1(
2040	the_repository, branch, err);
2041	return branch->push_tracking_ref;
2042	}
2043
2044	static int ignore_symref_update(const char refname, struct strbuf scratch)
2045	{
2046	return !refs_read_symbolic_ref(get_main_ref_store(the_repository), refname, scratch);
2047	}
2048
2049	/*
2050	* Create and return a list of (struct ref) consisting of copies of
2051	* each remote_ref that matches refspec. refspec must be a pattern.
2052	* Fill in the copies' peer_ref to describe the local tracking refs to
2053	* which they map. Omit any references that would map to an existing
2054	* local symbolic ref.
2055	*/
2056	static struct ref get_expanded_map(const struct ref remote_refs,
2057	const struct refspec_item *refspec)
2058	{
2059	struct strbuf scratch = STRBUF_INIT;
2060	const struct ref *ref;
2061	struct ref *ret = NULL;
2062	struct ref **tail = &ret;
2063
2064	for (ref = remote_refs; ref; ref = ref->next) {
2065	char *expn_name = NULL;
2066
2067	strbuf_reset(&scratch);
2068
2069	if (strchr(ref->name, '^'))
2070	continue; /* a dereference item */
2071	if (match_refname_with_pattern(refspec->src, ref->name,
2072	refspec->dst, &expn_name) &&
2073	!ignore_symref_update(expn_name, &scratch)) {
2074	struct ref *cpy = copy_ref(ref);
2075
2076	if (cpy->peer_ref)
2077	free_one_ref(cpy->peer_ref);
2078	cpy->peer_ref = alloc_ref(expn_name);
2079	if (refspec->force)
2080	cpy->peer_ref->force = 1;
2081	*tail = cpy;
2082	tail = &cpy->next;
2083	}
2084	free(expn_name);
2085	}
2086
2087	strbuf_release(&scratch);
2088	return ret;
2089	}
2090
2091	static const struct ref find_ref_by_name_abbrev(const struct ref refs, const char *name)
2092	{
2093	const struct ref *ref;
2094	const struct ref *best_match = NULL;
2095	int best_score = 0;
2096
2097	for (ref = refs; ref; ref = ref->next) {
2098	int score = refname_match(name, ref->name);
2099
2100	if (best_score < score) {
2101	best_match = ref;
2102	best_score = score;
2103	}
2104	}
2105	return best_match;
2106	}
2107
2108	struct ref get_remote_ref(const struct ref remote_refs, const char *name)
2109	{
2110	const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
2111
2112	if (!ref)
2113	return NULL;
2114
2115	return copy_ref(ref);
2116	}
2117
2118	static struct ref get_local_ref(const char name)
2119	{
2120	if (!name \|\| name[0] == '\0')
2121	return NULL;
2122
2123	if (starts_with(name, "refs/"))
2124	return alloc_ref(name);
2125
2126	if (starts_with(name, "heads/") \|\|
2127	starts_with(name, "tags/") \|\|
2128	starts_with(name, "remotes/"))
2129	return alloc_ref_with_prefix("refs/", 5, name);
2130
2131	return alloc_ref_with_prefix("refs/heads/", 11, name);
2132	}
2133
2134	int get_fetch_map(const struct ref *remote_refs,
2135	const struct refspec_item *refspec,
2136	struct ref ***tail,
2137	int missing_ok)
2138	{
2139	struct ref ref_map, *rmp;
2140
2141	if (refspec->negative)
2142	return 0;
2143
2144	if (refspec->pattern) {
2145	ref_map = get_expanded_map(remote_refs, refspec);
2146	} else {
2147	const char *name = refspec->src[0] ? refspec->src : "HEAD";
2148
2149	if (refspec->exact_sha1) {
2150	ref_map = alloc_ref(name);
2151	get_oid_hex(name, &ref_map->old_oid);
2152	ref_map->exact_oid = 1;
2153	} else {
2154	ref_map = get_remote_ref(remote_refs, name);
2155	}
2156	if (!missing_ok && !ref_map)
2157	die(_("couldn't find remote ref %s"), name);
2158	if (ref_map) {
2159	ref_map->peer_ref = get_local_ref(refspec->dst);
2160	if (ref_map->peer_ref && refspec->force)
2161	ref_map->peer_ref->force = 1;
2162	}
2163	}
2164
2165	for (rmp = &ref_map; *rmp; ) {
2166	if ((*rmp)->peer_ref) {
2167	if (!starts_with((*rmp)->peer_ref->name, "refs/") \|\|
2168	check_refname_format((*rmp)->peer_ref->name, 0)) {
2169	struct ref ignore = rmp;
2170	error(_("* Ignoring funny ref '%s' locally"),
2171	(*rmp)->peer_ref->name);
2172	rmp = (rmp)->next;
2173	free(ignore->peer_ref);
2174	free(ignore);
2175	continue;
2176	}
2177	}
2178	rmp = &((*rmp)->next);
2179	}
2180
2181	if (ref_map)
2182	tail_link_ref(ref_map, tail);
2183
2184	return 0;
2185	}
2186
2187	int get_remote_group(const char key, const char value,
2188	const struct config_context *ctx UNUSED,
2189	void *priv)
2190	{
2191	struct remote_group_data *g = priv;
2192
2193	if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
2194	/* split list by white space */
2195	while (*value) {
2196	size_t wordlen = strcspn(value, " \t\n");
2197
2198	if (wordlen >= 1)
2199	string_list_append_nodup(g->list,
2200	xstrndup(value, wordlen));
2201	value += wordlen + (value[wordlen] != '\0');
2202	}
2203	}
2204
2205	return 0;
2206	}
2207
2208	int add_remote_or_group(const char name, struct string_list list)
2209	{
2210	int prev_nr = list->nr;
2211	struct remote_group_data g;
2212	g.name = name; g.list = list;
2213
2214	repo_config(the_repository, get_remote_group, &g);
2215	if (list->nr == prev_nr) {
2216	struct remote *remote = remote_get(name);
2217	if (!remote_is_configured(remote, 0))
2218	return 0;
2219	string_list_append(list, remote->name);
2220	}
2221	return 1;
2222	}
2223
2224	int resolve_remote_symref(struct ref ref, struct ref list)
2225	{
2226	if (!ref->symref)
2227	return 0;
2228	for (; list; list = list->next)
2229	if (!strcmp(ref->symref, list->name)) {
2230	oidcpy(&ref->old_oid, &list->old_oid);
2231	return 0;
2232	}
2233	return 1;
2234	}
2235
2236	/*
2237	* Compute the commit ahead/behind values for the pair branch_name, base.
2238	*
2239	* If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
2240	* counts in num_ours and num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
2241	* the (potentially expensive) a/b computation (num_ours and num_theirs are
2242	* set to zero).
2243	*
2244	* Returns -1 if num_ours and num_theirs could not be filled in (e.g., ref
2245	* does not exist). Returns 0 if the commits are identical. Returns 1 if
2246	* commits are different.
2247	*/
2248
2249	static int stat_branch_pair(const char branch_name, const char base,
2250	int num_ours, int num_theirs,
2251	enum ahead_behind_flags abf)
2252	{
2253	struct object_id oid;
2254	struct commit ours, theirs;
2255	struct rev_info revs;
2256	struct strvec argv = STRVEC_INIT;
2257
2258	/* Cannot stat if what we used to build on no longer exists */
2259	if (refs_read_ref(get_main_ref_store(the_repository), base, &oid))
2260	return -1;
2261	theirs = lookup_commit_reference(the_repository, &oid);
2262	if (!theirs)
2263	return -1;
2264
2265	if (refs_read_ref(get_main_ref_store(the_repository), branch_name, &oid))
2266	return -1;
2267	ours = lookup_commit_reference(the_repository, &oid);
2268	if (!ours)
2269	return -1;
2270
2271	num_theirs = num_ours = 0;
2272
2273	/* are we the same? */
2274	if (theirs == ours)
2275	return 0;
2276	if (abf == AHEAD_BEHIND_QUICK)
2277	return 1;
2278	if (abf != AHEAD_BEHIND_FULL)
2279	BUG("stat_branch_pair: invalid abf '%d'", abf);
2280
2281	/* Run "rev-list --left-right ours...theirs" internally... */
2282	strvec_push(&argv, ""); /* ignored */
2283	strvec_push(&argv, "--left-right");
2284	strvec_pushf(&argv, "%s...%s",
2285	oid_to_hex(&ours->object.oid),
2286	oid_to_hex(&theirs->object.oid));
2287	strvec_push(&argv, "--");
2288
2289	repo_init_revisions(the_repository, &revs, NULL);
2290	setup_revisions_from_strvec(&argv, &revs, NULL);
2291	if (prepare_revision_walk(&revs))
2292	die(_("revision walk setup failed"));
2293
2294	/* ... and count the commits on each side. */
2295	while (1) {
2296	struct commit *c = get_revision(&revs);
2297	if (!c)
2298	break;
2299	if (c->object.flags & SYMMETRIC_LEFT)
2300	(*num_ours)++;
2301	else
2302	(*num_theirs)++;
2303	}
2304
2305	/* clear object flags smudged by the above traversal */
2306	clear_commit_marks(ours, ALL_REV_FLAGS);
2307	clear_commit_marks(theirs, ALL_REV_FLAGS);
2308
2309	strvec_clear(&argv);
2310	release_revisions(&revs);
2311	return 1;
2312	}
2313
2314	/*
2315	* Lookup the tracking branch for the given branch and if present, optionally
2316	* compute the commit ahead/behind values for the pair.
2317	*
2318	* If for_push is true, the tracking branch refers to the push branch,
2319	* otherwise it refers to the upstream branch.
2320	*
2321	* The name of the tracking branch (or NULL if it is not defined) is
2322	* returned via *tracking_name, if it is not itself NULL.
2323	*
2324	* If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
2325	* counts in num_ours and num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
2326	* the (potentially expensive) a/b computation (num_ours and num_theirs are
2327	* set to zero).
2328	*
2329	* Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
2330	* upstream defined, or ref does not exist). Returns 0 if the commits are
2331	* identical. Returns 1 if commits are different.
2332	*/
2333	int stat_tracking_info(struct branch branch, int num_ours, int *num_theirs,
2334	const char **tracking_name, int for_push,
2335	enum ahead_behind_flags abf)
2336	{
2337	const char *base;
2338
2339	/* Cannot stat unless we are marked to build on top of somebody else. */
2340	base = for_push ? branch_get_push(branch, NULL) :
2341	branch_get_upstream(branch, NULL);
2342	if (tracking_name)
2343	*tracking_name = base;
2344	if (!base)
2345	return -1;
2346
2347	return stat_branch_pair(branch->refname, base, num_ours, num_theirs, abf);
2348	}
2349
2350	static char resolve_compare_branch(struct branch branch, const char *name)
2351	{
2352	const char *resolved = NULL;
2353
2354	if (!branch \|\| !name)
2355	return NULL;
2356
2357	if (!strcasecmp(name, "@{upstream}")) {
2358	resolved = branch_get_upstream(branch, NULL);
2359	} else if (!strcasecmp(name, "@{push}")) {
2360	resolved = branch_get_push(branch, NULL);
2361	} else {
2362	warning(_("ignoring value '%s' for status.compareBranches, "
2363	"only @{upstream} and @{push} are supported"),
2364	name);
2365	return NULL;
2366	}
2367
2368	if (resolved)
2369	return xstrdup(resolved);
2370	return NULL;
2371	}
2372
2373	static void format_branch_comparison(struct strbuf *sb,
2374	bool up_to_date,
2375	int ours, int theirs,
2376	const char *branch_name,
2377	const char *push_remote_name,
2378	const char *push_branch_name,
2379	enum ahead_behind_flags abf,
2380	unsigned flags)
2381	{
2382	bool use_push_advice = (flags & ENABLE_ADVICE_PUSH);
2383	bool use_pull_advice = (flags & ENABLE_ADVICE_PULL);
2384	bool use_divergence_advice = (flags & ENABLE_ADVICE_DIVERGENCE);
2385
2386	if (up_to_date) {
2387	strbuf_addf(sb,
2388	_("Your branch is up to date with '%s'.\n"),
2389	branch_name);
2390	} else if (abf == AHEAD_BEHIND_QUICK) {
2391	strbuf_addf(sb,
2392	_("Your branch and '%s' refer to different commits.\n"),
2393	branch_name);
2394	if (use_push_advice && advice_enabled(ADVICE_STATUS_HINTS))
2395	strbuf_addf(sb, _(" (use \"%s\" for details)\n"),
2396	"git status --ahead-behind");
2397	} else if (!theirs) {
2398	strbuf_addf(sb,
2399	Q_("Your branch is ahead of '%s' by %d commit.\n",
2400	"Your branch is ahead of '%s' by %d commits.\n",
2401	ours),
2402	branch_name, ours);
2403	if (use_push_advice && advice_enabled(ADVICE_STATUS_HINTS))
2404	strbuf_addstr(sb,
2405	_(" (use \"git push\" to publish your local commits)\n"));
2406	} else if (!ours) {
2407	strbuf_addf(sb,
2408	Q_("Your branch is behind '%s' by %d commit, "
2409	"and can be fast-forwarded.\n",
2410	"Your branch is behind '%s' by %d commits, "
2411	"and can be fast-forwarded.\n",
2412	theirs),
2413	branch_name, theirs);
2414	if (use_pull_advice && advice_enabled(ADVICE_STATUS_HINTS)) {
2415	if (push_remote_name && push_branch_name)
2416	strbuf_addf(sb,
2417	_(" (use \"git pull %s %s\" to update your local branch)\n"),
2418	push_remote_name, push_branch_name);
2419	else
2420	strbuf_addstr(sb,
2421	_(" (use \"git pull\" to update your local branch)\n"));
2422	}
2423	} else {
2424	strbuf_addf(sb,
2425	Q_("Your branch and '%s' have diverged,\n"
2426	"and have %d and %d different commit each, "
2427	"respectively.\n",
2428	"Your branch and '%s' have diverged,\n"
2429	"and have %d and %d different commits each, "
2430	"respectively.\n",
2431	ours + theirs),
2432	branch_name, ours, theirs);
2433	if (use_divergence_advice && advice_enabled(ADVICE_STATUS_HINTS)) {
2434	if (push_remote_name && push_branch_name)
2435	strbuf_addf(sb,
2436	_(" (use \"git pull %s %s\" if you want to integrate the remote branch with yours)\n"),
2437	push_remote_name, push_branch_name);
2438	else
2439	strbuf_addstr(sb,
2440	_(" (use \"git pull\" if you want to integrate the remote branch with yours)\n"));
2441	}
2442	}
2443	}
2444
2445	/*
2446	* Return true when there is anything to report, otherwise false.
2447	*/
2448	int format_tracking_info(struct branch branch, struct strbuf sb,
2449	enum ahead_behind_flags abf,
2450	int show_divergence_advice)
2451	{
2452	char *compare_branches = NULL;
2453	struct string_list branches = STRING_LIST_INIT_DUP;
2454	struct strset processed_refs = STRSET_INIT;
2455	int reported = 0;
2456	size_t i;
2457	const char *upstream_ref;
2458	const char *push_ref;
2459
2460	repo_config_get_string(the_repository, "status.comparebranches",
2461	&compare_branches);
2462
2463	if (compare_branches) {
2464	string_list_split(&branches, compare_branches, " ", -1);
2465	string_list_remove_empty_items(&branches, 0);
2466	} else {
2467	string_list_append(&branches, "@{upstream}");
2468	}
2469
2470	upstream_ref = branch_get_upstream(branch, NULL);
2471	push_ref = branch_get_push(branch, NULL);
2472
2473	for (i = 0; i < branches.nr; i++) {
2474	char *full_ref;
2475	char *short_ref;
2476	int ours, theirs, cmp;
2477	int is_upstream, is_push;
2478	unsigned flags = 0;
2479	const char *push_remote_name = NULL;
2480	const char *push_branch_name = NULL;
2481
2482	full_ref = resolve_compare_branch(branch,
2483	branches.items[i].string);
2484	if (!full_ref)
2485	continue;
2486
2487	if (!strset_add(&processed_refs, full_ref)) {
2488	free(full_ref);
2489	continue;
2490	}
2491
2492	short_ref = refs_shorten_unambiguous_ref(
2493	get_main_ref_store(the_repository), full_ref, 0);
2494
2495	is_upstream = upstream_ref && !strcmp(full_ref, upstream_ref);
2496	is_push = push_ref && !strcmp(full_ref, push_ref);
2497
2498	if (is_upstream && (!push_ref \|\| !strcmp(upstream_ref, push_ref)))
2499	is_push = 1;
2500
2501	cmp = stat_branch_pair(branch->refname, full_ref,
2502	&ours, &theirs, abf);
2503
2504	if (cmp < 0) {
2505	if (is_upstream) {
2506	strbuf_addf(sb,
2507	_("Your branch is based on '%s', but the upstream is gone.\n"),
2508	short_ref);
2509	if (advice_enabled(ADVICE_STATUS_HINTS))
2510	strbuf_addstr(sb,
2511	_(" (use \"git branch --unset-upstream\" to fixup)\n"));
2512	reported = 1;
2513	}
2514	free(full_ref);
2515	free(short_ref);
2516	continue;
2517	}
2518
2519	if (reported)
2520	strbuf_addstr(sb, "\n");
2521
2522	if (is_upstream)
2523	flags \|= ENABLE_ADVICE_PULL;
2524	if (show_divergence_advice && is_upstream)
2525	flags \|= ENABLE_ADVICE_DIVERGENCE;
2526	if (is_push) {
2527	flags \|= ENABLE_ADVICE_PUSH;
2528	if (!upstream_ref \|\| strcmp(upstream_ref, full_ref)) {
2529	push_remote_name = pushremote_for_branch(branch, NULL);
2530	if (push_remote_name &&
2531	skip_prefix(full_ref, "refs/remotes/", &push_branch_name) &&
2532	skip_prefix(push_branch_name, push_remote_name, &push_branch_name) &&
2533	*push_branch_name == '/') {
2534	push_branch_name++;
2535	flags \|= ENABLE_ADVICE_PULL;
2536	} else {
2537	push_remote_name = NULL;
2538	}
2539	} else {
2540	flags \|= ENABLE_ADVICE_PULL;
2541	}
2542	}
2543	format_branch_comparison(sb, !cmp, ours, theirs, short_ref,
2544	push_remote_name, push_branch_name,
2545	abf, flags);
2546	reported = 1;
2547
2548	free(full_ref);
2549	free(short_ref);
2550	}
2551
2552	string_list_clear(&branches, 0);
2553	strset_clear(&processed_refs);
2554	free(compare_branches);
2555	return reported;
2556	}
2557
2558	static int one_local_ref(const struct reference ref, void cb_data)
2559	{
2560	struct ref ***local_tail = cb_data;
2561	struct ref *local_ref;
2562
2563	/* we already know it starts with refs/ to get here */
2564	if (check_refname_format(ref->name + 5, 0))
2565	return 0;
2566
2567	local_ref = alloc_ref(ref->name);
2568	oidcpy(&local_ref->new_oid, ref->oid);
2569	**local_tail = local_ref;
2570	*local_tail = &local_ref->next;
2571	return 0;
2572	}
2573
2574	struct ref *get_local_heads(void)
2575	{
2576	struct ref local_refs = NULL, *local_tail = &local_refs;
2577
2578	refs_for_each_ref(get_main_ref_store(the_repository), one_local_ref,
2579	&local_tail);
2580	return local_refs;
2581	}
2582
2583	struct ref guess_remote_head(const struct ref head,
2584	const struct ref *refs,
2585	unsigned flags)
2586	{
2587	const struct ref *r;
2588	struct ref *list = NULL;
2589	struct ref **tail = &list;
2590
2591	if (!head)
2592	return NULL;
2593
2594	/*
2595	* Some transports support directly peeking at
2596	* where HEAD points; if that is the case, then
2597	* we don't have to guess.
2598	*/
2599	if (head->symref)
2600	return copy_ref(find_ref_by_name(refs, head->symref));
2601
2602	/* If a remote branch exists with the default branch name, let's use it. */
2603	if (!(flags & REMOTE_GUESS_HEAD_ALL)) {
2604	char *default_branch =
2605	repo_default_branch_name(the_repository,
2606	flags & REMOTE_GUESS_HEAD_QUIET);
2607	char *ref = xstrfmt("refs/heads/%s", default_branch);
2608
2609	r = find_ref_by_name(refs, ref);
2610	free(ref);
2611	free(default_branch);
2612
2613	if (r && oideq(&r->old_oid, &head->old_oid))
2614	return copy_ref(r);
2615
2616	/* Fall back to the hard-coded historical default */
2617	r = find_ref_by_name(refs, "refs/heads/master");
2618	if (r && oideq(&r->old_oid, &head->old_oid))
2619	return copy_ref(r);
2620	}
2621
2622	/* Look for another ref that points there */
2623	for (r = refs; r; r = r->next) {
2624	if (r != head &&
2625	starts_with(r->name, "refs/heads/") &&
2626	oideq(&r->old_oid, &head->old_oid)) {
2627	*tail = copy_ref(r);
2628	tail = &((*tail)->next);
2629	if (!(flags & REMOTE_GUESS_HEAD_ALL))
2630	break;
2631	}
2632	}
2633
2634	return list;
2635	}
2636
2637	struct stale_heads_info {
2638	struct string_list *ref_names;
2639	struct ref **stale_refs_tail;
2640	struct refspec *rs;
2641	};
2642
2643	static int get_stale_heads_cb(const struct reference ref, void cb_data)
2644	{
2645	struct stale_heads_info *info = cb_data;
2646	struct string_list matches = STRING_LIST_INIT_DUP;
2647	struct refspec_item query;
2648	int i, stale = 1;
2649	memset(&query, 0, sizeof(struct refspec_item));
2650	query.dst = (char *)ref->name;
2651
2652	refspec_find_all_matches(info->rs, &query, &matches);
2653	if (matches.nr == 0)
2654	goto clean_exit; /* No matches */
2655
2656	/*
2657	* If we did find a suitable refspec and it's not a symref and
2658	* it's not in the list of refs that currently exist in that
2659	* remote, we consider it to be stale. In order to deal with
2660	* overlapping refspecs, we need to go over all of the
2661	* matching refs.
2662	*/
2663	if (ref->flags & REF_ISSYMREF)
2664	goto clean_exit;
2665
2666	for (i = 0; stale && i < matches.nr; i++)
2667	if (string_list_has_string(info->ref_names, matches.items[i].string))
2668	stale = 0;
2669
2670	if (stale) {
2671	struct ref *linked_ref = make_linked_ref(ref->name, &info->stale_refs_tail);
2672	oidcpy(&linked_ref->new_oid, ref->oid);
2673	}
2674
2675	clean_exit:
2676	string_list_clear(&matches, 0);
2677	return 0;
2678	}
2679
2680	struct ref get_stale_heads(struct refspec rs, struct ref *fetch_map)
2681	{
2682	struct ref ref, stale_refs = NULL;
2683	struct string_list ref_names = STRING_LIST_INIT_NODUP;
2684	struct stale_heads_info info;
2685
2686	info.ref_names = &ref_names;
2687	info.stale_refs_tail = &stale_refs;
2688	info.rs = rs;
2689	for (ref = fetch_map; ref; ref = ref->next)
2690	string_list_append(&ref_names, ref->name);
2691	string_list_sort(&ref_names);
2692	refs_for_each_ref(get_main_ref_store(the_repository),
2693	get_stale_heads_cb, &info);
2694	string_list_clear(&ref_names, 0);
2695	return stale_refs;
2696	}
2697
2698	/*
2699	* Compare-and-swap
2700	*/
2701	void clear_cas_option(struct push_cas_option *cas)
2702	{
2703	int i;
2704
2705	for (i = 0; i < cas->nr; i++)
2706	free(cas->entry[i].refname);
2707	free(cas->entry);
2708	memset(cas, 0, sizeof(*cas));
2709	}
2710
2711	static struct push_cas add_cas_entry(struct push_cas_option cas,
2712	const char *refname,
2713	size_t refnamelen)
2714	{
2715	struct push_cas *entry;
2716	ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2717	entry = &cas->entry[cas->nr++];
2718	memset(entry, 0, sizeof(*entry));
2719	entry->refname = xmemdupz(refname, refnamelen);
2720	return entry;
2721	}
2722
2723	static int parse_push_cas_option(struct push_cas_option cas, const char arg, int unset)
2724	{
2725	const char *colon;
2726	struct push_cas *entry;
2727
2728	if (unset) {
2729	/* "--no-<option>" */
2730	clear_cas_option(cas);
2731	return 0;
2732	}
2733
2734	if (!arg) {
2735	/* just "--<option>" */
2736	cas->use_tracking_for_rest = 1;
2737	return 0;
2738	}
2739
2740	/* "--<option>=refname" or "--<option>=refname:value" */
2741	colon = strchrnul(arg, ':');
2742	entry = add_cas_entry(cas, arg, colon - arg);
2743	if (!*colon)
2744	entry->use_tracking = 1;
2745	else if (!colon[1])
2746	oidclr(&entry->expect, the_repository->hash_algo);
2747	else if (repo_get_oid(the_repository, colon + 1, &entry->expect))
2748	return error(_("cannot parse expected object name '%s'"),
2749	colon + 1);
2750	return 0;
2751	}
2752
2753	int parseopt_push_cas_option(const struct option opt, const char arg, int unset)
2754	{
2755	return parse_push_cas_option(opt->value, arg, unset);
2756	}
2757
2758	int is_empty_cas(const struct push_cas_option *cas)
2759	{
2760	return !cas->use_tracking_for_rest && !cas->nr;
2761	}
2762
2763	/*
2764	* Look at remote.fetch refspec and see if we have a remote
2765	* tracking branch for the refname there. Fill the name of
2766	* the remote-tracking branch in *dst_refname, and the name
2767	* of the commit object at its tip in oid[].
2768	* If we cannot do so, return negative to signal an error.
2769	*/
2770	static int remote_tracking(struct remote remote, const char refname,
2771	struct object_id oid, char *dst_refname)
2772	{
2773	char *dst;
2774
2775	if (!remote)
2776	BUG("remote_tracking() called with NULL remote");
2777	dst = apply_refspecs(&remote->fetch, refname);
2778	if (!dst)
2779	return -1; /* no tracking ref for refname at remote */
2780	if (refs_read_ref(get_main_ref_store(the_repository), dst, oid)) {
2781	free(dst);
2782	return -1; /* we know what the tracking ref is but we cannot read it */
2783	}
2784
2785	*dst_refname = dst;
2786	return 0;
2787	}
2788
2789	struct check_and_collect_until_cb_data {
2790	struct commit *remote_commit;
2791	struct commit_stack *local_commits;
2792	timestamp_t remote_reflog_timestamp;
2793	};
2794
2795	/* Get the timestamp of the latest entry. */
2796	static int peek_reflog(const char *refname UNUSED,
2797	struct object_id *o_oid UNUSED,
2798	struct object_id *n_oid UNUSED,
2799	const char *ident UNUSED,
2800	timestamp_t timestamp, int tz UNUSED,
2801	const char message UNUSED, void cb_data)
2802	{
2803	timestamp_t *ts = cb_data;
2804	*ts = timestamp;
2805	return 1;
2806	}
2807
2808	static int check_and_collect_until(const char *refname UNUSED,
2809	struct object_id *o_oid UNUSED,
2810	struct object_id *n_oid,
2811	const char *ident UNUSED,
2812	timestamp_t timestamp, int tz UNUSED,
2813	const char message UNUSED, void cb_data)
2814	{
2815	struct commit *commit;
2816	struct check_and_collect_until_cb_data *cb = cb_data;
2817
2818	/* An entry was found. */
2819	if (oideq(n_oid, &cb->remote_commit->object.oid))
2820	return 1;
2821
2822	if ((commit = lookup_commit_reference(the_repository, n_oid)))
2823	commit_stack_push(cb->local_commits, commit);
2824
2825	/*
2826	* If the reflog entry timestamp is older than the remote ref's
2827	* latest reflog entry, there is no need to check or collect
2828	* entries older than this one.
2829	*/
2830	if (timestamp < cb->remote_reflog_timestamp)
2831	return -1;
2832
2833	return 0;
2834	}
2835
2836	#define MERGE_BASES_BATCH_SIZE 8
2837
2838	/*
2839	* Iterate through the reflog of the local ref to check if there is an entry
2840	* for the given remote-tracking ref; runs until the timestamp of an entry is
2841	* older than latest timestamp of remote-tracking ref's reflog. Any commits
2842	* are that seen along the way are collected into an array to check if the
2843	* remote-tracking ref is reachable from any of them.
2844	*/
2845	static int is_reachable_in_reflog(const char local, const struct ref remote)
2846	{
2847	timestamp_t date;
2848	struct commit *commit;
2849	struct commit **chunk;
2850	struct check_and_collect_until_cb_data cb;
2851	struct commit_stack arr = COMMIT_STACK_INIT;
2852	size_t size = 0;
2853	int ret = 0;
2854
2855	commit = lookup_commit_reference(the_repository, &remote->old_oid);
2856	if (!commit)
2857	goto cleanup_return;
2858
2859	/*
2860	* Get the timestamp from the latest entry
2861	* of the remote-tracking ref's reflog.
2862	*/
2863	refs_for_each_reflog_ent_reverse(get_main_ref_store(the_repository),
2864	remote->tracking_ref, peek_reflog,
2865	&date);
2866
2867	cb.remote_commit = commit;
2868	cb.local_commits = &arr;
2869	cb.remote_reflog_timestamp = date;
2870	ret = refs_for_each_reflog_ent_reverse(get_main_ref_store(the_repository),
2871	local, check_and_collect_until,
2872	&cb);
2873
2874	/* We found an entry in the reflog. */
2875	if (ret > 0)
2876	goto cleanup_return;
2877
2878	/*
2879	* Check if the remote commit is reachable from any
2880	* of the commits in the collected array, in batches.
2881	*/
2882	for (chunk = arr.items; chunk < arr.items + arr.nr; chunk += size) {
2883	size = arr.items + arr.nr - chunk;
2884	if (MERGE_BASES_BATCH_SIZE < size)
2885	size = MERGE_BASES_BATCH_SIZE;
2886
2887	if ((ret = repo_in_merge_bases_many(the_repository, commit, size, chunk, 0)))
2888	break;
2889	}
2890
2891	cleanup_return:
2892	commit_stack_clear(&arr);
2893	return ret;
2894	}
2895
2896	/*
2897	* Check for reachability of a remote-tracking
2898	* ref in the reflog entries of its local ref.
2899	*/
2900	static void check_if_includes_upstream(struct ref *remote)
2901	{
2902	struct ref *local = get_local_ref(remote->name);
2903	if (!local)
2904	return;
2905
2906	if (is_reachable_in_reflog(local->name, remote) <= 0)
2907	remote->unreachable = 1;
2908	free_one_ref(local);
2909	}
2910
2911	static void apply_cas(struct push_cas_option *cas,
2912	struct remote *remote,
2913	struct ref *ref)
2914	{
2915	int i;
2916
2917	/* Find an explicit --<option>=<name>[:<value>] entry */
2918	for (i = 0; i < cas->nr; i++) {
2919	struct push_cas *entry = &cas->entry[i];
2920	if (!refname_match(entry->refname, ref->name))
2921	continue;
2922	ref->expect_old_sha1 = 1;
2923	if (!entry->use_tracking)
2924	oidcpy(&ref->old_oid_expect, &entry->expect);
2925	else if (remote_tracking(remote, ref->name,
2926	&ref->old_oid_expect,
2927	&ref->tracking_ref))
2928	oidclr(&ref->old_oid_expect, the_repository->hash_algo);
2929	else
2930	ref->check_reachable = cas->use_force_if_includes;
2931	return;
2932	}
2933
2934	/* Are we using "--<option>" to cover all? */
2935	if (!cas->use_tracking_for_rest)
2936	return;
2937
2938	ref->expect_old_sha1 = 1;
2939	if (remote_tracking(remote, ref->name,
2940	&ref->old_oid_expect,
2941	&ref->tracking_ref))
2942	oidclr(&ref->old_oid_expect, the_repository->hash_algo);
2943	else
2944	ref->check_reachable = cas->use_force_if_includes;
2945	}
2946
2947	void apply_push_cas(struct push_cas_option *cas,
2948	struct remote *remote,
2949	struct ref *remote_refs)
2950	{
2951	struct ref *ref;
2952	for (ref = remote_refs; ref; ref = ref->next) {
2953	apply_cas(cas, remote, ref);
2954
2955	/*
2956	* If "compare-and-swap" is in "use_tracking[_for_rest]"
2957	* mode, and if "--force-if-includes" was specified, run
2958	* the check.
2959	*/
2960	if (ref->check_reachable)
2961	check_if_includes_upstream(ref);
2962	}
2963	}
2964
2965	struct remote_state *remote_state_new(void)
2966	{
2967	struct remote_state *r;
2968
2969	CALLOC_ARRAY(r, 1);
2970
2971	hashmap_init(&r->remotes_hash, remotes_hash_cmp, NULL, 0);
2972	hashmap_init(&r->branches_hash, branches_hash_cmp, NULL, 0);
2973	return r;
2974	}
2975
2976	void remote_state_clear(struct remote_state *remote_state)
2977	{
2978	struct hashmap_iter iter;
2979	struct branch *b;
2980	int i;
2981
2982	for (i = 0; i < remote_state->remotes_nr; i++)
2983	remote_clear(remote_state->remotes[i]);
2984	FREE_AND_NULL(remote_state->remotes);
2985	FREE_AND_NULL(remote_state->pushremote_name);
2986	remote_state->remotes_alloc = 0;
2987	remote_state->remotes_nr = 0;
2988
2989	rewrites_release(&remote_state->rewrites);
2990	rewrites_release(&remote_state->rewrites_push);
2991
2992	hashmap_clear_and_free(&remote_state->remotes_hash, struct remote, ent);
2993	hashmap_for_each_entry(&remote_state->branches_hash, &iter, b, ent) {
2994	branch_release(b);
2995	free(b);
2996	}
2997	hashmap_clear(&remote_state->branches_hash);
2998	}
2999
3000	/*
3001	* Returns 1 if it was the last chop before ':'.
3002	*/
3003	static int chop_last_dir(char **remoteurl, int is_relative)
3004	{
3005	char rfind = find_last_dir_sep(remoteurl);
3006	if (rfind) {
3007	*rfind = '\0';
3008	return 0;
3009	}
3010
3011	rfind = strrchr(*remoteurl, ':');
3012	if (rfind) {
3013	*rfind = '\0';
3014	return 1;
3015	}
3016
3017	if (is_relative \|\| !strcmp(".", *remoteurl))
3018	die(_("cannot strip one component off url '%s'"),
3019	*remoteurl);
3020
3021	free(*remoteurl);
3022	*remoteurl = xstrdup(".");
3023	return 0;
3024	}
3025
3026	char relative_url(const char remote_url, const char *url,
3027	const char *up_path)
3028	{
3029	int is_relative = 0;
3030	int colonsep = 0;
3031	char *out;
3032	char *remoteurl;
3033	struct strbuf sb = STRBUF_INIT;
3034	size_t len;
3035
3036	if (!url_is_local_not_ssh(url) \|\| is_absolute_path(url))
3037	return xstrdup(url);
3038
3039	len = strlen(remote_url);
3040	if (!len)
3041	BUG("invalid empty remote_url");
3042
3043	remoteurl = xstrdup(remote_url);
3044	if (is_dir_sep(remoteurl[len-1]))
3045	remoteurl[len-1] = '\0';
3046
3047	if (!url_is_local_not_ssh(remoteurl) \|\| is_absolute_path(remoteurl))
3048	is_relative = 0;
3049	else {
3050	is_relative = 1;
3051	/*
3052	* Prepend a './' to ensure all relative
3053	* remoteurls start with './' or '../'
3054	*/
3055	if (!starts_with_dot_slash_native(remoteurl) &&
3056	!starts_with_dot_dot_slash_native(remoteurl)) {
3057	strbuf_reset(&sb);
3058	strbuf_addf(&sb, "./%s", remoteurl);
3059	free(remoteurl);
3060	remoteurl = strbuf_detach(&sb, NULL);
3061	}
3062	}
3063	/*
3064	* When the url starts with '../', remove that and the
3065	* last directory in remoteurl.
3066	*/
3067	while (*url) {
3068	if (starts_with_dot_dot_slash_native(url)) {
3069	url += 3;
3070	colonsep \|= chop_last_dir(&remoteurl, is_relative);
3071	} else if (starts_with_dot_slash_native(url))
3072	url += 2;
3073	else
3074	break;
3075	}
3076	strbuf_reset(&sb);
3077	strbuf_addf(&sb, "%s%s%s", remoteurl, colonsep ? ":" : "/", url);
3078	if (ends_with(url, "/"))
3079	strbuf_setlen(&sb, sb.len - 1);
3080	free(remoteurl);
3081
3082	if (starts_with_dot_slash_native(sb.buf))
3083	out = xstrdup(sb.buf + 2);
3084	else
3085	out = xstrdup(sb.buf);
3086
3087	if (!up_path \|\| !is_relative) {
3088	strbuf_release(&sb);
3089	return out;
3090	}
3091
3092	strbuf_reset(&sb);
3093	strbuf_addf(&sb, "%s%s", up_path, out);
3094	free(out);
3095	return strbuf_detach(&sb, NULL);
3096	}
3097
3098	int valid_remote_name(const char *name)
3099	{
3100	int result;
3101	struct strbuf refspec = STRBUF_INIT;
3102	strbuf_addf(&refspec, "refs/heads/test:refs/remotes/%s/test", name);
3103	result = valid_fetch_refspec(refspec.buf, the_hash_algo);
3104	strbuf_release(&refspec);
3105	return result;
3106	}