[thirdparty/git.git] / remote.c

#include "cache.h"
#include "remote.h"
#include "refs.h"

static struct remote **remotes;
static int allocated_remotes;

#define BUF_SIZE (2048)
static char buffer[BUF_SIZE];

static void add_push_refspec(struct remote *remote, const char *ref)
{
	int nr = remote->push_refspec_nr + 1;
	remote->push_refspec =
		xrealloc(remote->push_refspec, nr * sizeof(char *));
	remote->push_refspec[nr-1] = ref;
	remote->push_refspec_nr = nr;
}

static void add_fetch_refspec(struct remote *remote, const char *ref)
{
	int nr = remote->fetch_refspec_nr + 1;
	remote->fetch_refspec =
		xrealloc(remote->fetch_refspec, nr * sizeof(char *));
	remote->fetch_refspec[nr-1] = ref;
	remote->fetch_refspec_nr = nr;
}

static void add_uri(struct remote *remote, const char *uri)
{
	int nr = remote->uri_nr + 1;
	remote->uri =
		xrealloc(remote->uri, nr * sizeof(char *));
	remote->uri[nr-1] = uri;
	remote->uri_nr = nr;
}

static struct remote *make_remote(const char *name, int len)
{
	int i, empty = -1;

	for (i = 0; i < allocated_remotes; i++) {
		if (!remotes[i]) {
			if (empty < 0)
				empty = i;
		} else {
			if (len ? (!strncmp(name, remotes[i]->name, len) &&
				   !remotes[i]->name[len]) :
			    !strcmp(name, remotes[i]->name))
				return remotes[i];
		}
	}

	if (empty < 0) {
		empty = allocated_remotes;
		allocated_remotes += allocated_remotes ? allocated_remotes : 1;
		remotes = xrealloc(remotes,
				   sizeof(*remotes) * allocated_remotes);
		memset(remotes + empty, 0,
		       (allocated_remotes - empty) * sizeof(*remotes));
	}
	remotes[empty] = xcalloc(1, sizeof(struct remote));
	if (len)
		remotes[empty]->name = xstrndup(name, len);
	else
		remotes[empty]->name = xstrdup(name);
	return remotes[empty];
}

static void read_remotes_file(struct remote *remote)
{
	FILE *f = fopen(git_path("remotes/%s", remote->name), "r");

	if (!f)
		return;
	while (fgets(buffer, BUF_SIZE, f)) {
		int value_list;
		char *s, *p;

		if (!prefixcmp(buffer, "URL:")) {
			value_list = 0;
			s = buffer + 4;
		} else if (!prefixcmp(buffer, "Push:")) {
			value_list = 1;
			s = buffer + 5;
		} else if (!prefixcmp(buffer, "Pull:")) {
			value_list = 2;
			s = buffer + 5;
		} else
			continue;

		while (isspace(*s))
			s++;
		if (!*s)
			continue;

		p = s + strlen(s);
		while (isspace(p[-1]))
			*--p = 0;

		switch (value_list) {
		case 0:
			add_uri(remote, xstrdup(s));
			break;
		case 1:
			add_push_refspec(remote, xstrdup(s));
			break;
		case 2:
			add_fetch_refspec(remote, xstrdup(s));
			break;
		}
	}
	fclose(f);
}

static void read_branches_file(struct remote *remote)
{
	const char *slash = strchr(remote->name, '/');
	int n = slash ? slash - remote->name : 1000;
	FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
	char *s, *p;
	int len;

	if (!f)
		return;
	s = fgets(buffer, BUF_SIZE, f);
	fclose(f);
	if (!s)
		return;
	while (isspace(*s))
		s++;
	if (!*s)
		return;
	p = s + strlen(s);
	while (isspace(p[-1]))
		*--p = 0;
	len = p - s;
	if (slash)
		len += strlen(slash);
	p = xmalloc(len + 1);
	strcpy(p, s);
	if (slash)
		strcat(p, slash);
	add_uri(remote, p);
}

static char *default_remote_name = NULL;
static const char *current_branch = NULL;
static int current_branch_len = 0;

static int handle_config(const char *key, const char *value)
{
	const char *name;
	const char *subkey;
	struct remote *remote;
	if (!prefixcmp(key, "branch.") && current_branch &&
	    !strncmp(key + 7, current_branch, current_branch_len) &&
	    !strcmp(key + 7 + current_branch_len, ".remote")) {
		free(default_remote_name);
		default_remote_name = xstrdup(value);
	}
	if (prefixcmp(key,  "remote."))
		return 0;
	name = key + 7;
	subkey = strrchr(name, '.');
	if (!subkey)
		return error("Config with no key for remote %s", name);
	if (*subkey == '/') {
		warning("Config remote shorthand cannot begin with '/': %s", name);
		return 0;
	}
	remote = make_remote(name, subkey - name);
	if (!value) {
		/* if we ever have a boolean variable, e.g. "remote.*.disabled"
		 * [remote "frotz"]
		 *      disabled
		 * is a valid way to set it to true; we get NULL in value so
		 * we need to handle it here.
		 *
		 * if (!strcmp(subkey, ".disabled")) {
		 *      val = git_config_bool(key, value);
		 *      return 0;
		 * } else
		 *
		 */
		return 0; /* ignore unknown booleans */
	}
	if (!strcmp(subkey, ".url")) {
		add_uri(remote, xstrdup(value));
	} else if (!strcmp(subkey, ".push")) {
		add_push_refspec(remote, xstrdup(value));
	} else if (!strcmp(subkey, ".fetch")) {
		add_fetch_refspec(remote, xstrdup(value));
	} else if (!strcmp(subkey, ".receivepack")) {
		if (!remote->receivepack)
			remote->receivepack = xstrdup(value);
		else
			error("more than one receivepack given, using the first");
	} else if (!strcmp(subkey, ".uploadpack")) {
		if (!remote->uploadpack)
			remote->uploadpack = xstrdup(value);
		else
			error("more than one uploadpack given, using the first");
	}
	return 0;
}

static void read_config(void)
{
	unsigned char sha1[20];
	const char *head_ref;
	int flag;
	if (default_remote_name) // did this already
		return;
	default_remote_name = xstrdup("origin");
	current_branch = NULL;
	head_ref = resolve_ref("HEAD", sha1, 0, &flag);
	if (head_ref && (flag & REF_ISSYMREF) &&
	    !prefixcmp(head_ref, "refs/heads/")) {
		current_branch = head_ref + strlen("refs/heads/");
		current_branch_len = strlen(current_branch);
	}
	git_config(handle_config);
}

static struct refspec *parse_ref_spec(int nr_refspec, const char **refspec)
{
	int i;
	struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
	for (i = 0; i < nr_refspec; i++) {
		const char *sp, *ep, *gp;
		sp = refspec[i];
		if (*sp == '+') {
			rs[i].force = 1;
			sp++;
		}
		gp = strchr(sp, '*');
		ep = strchr(sp, ':');
		if (gp && ep && gp > ep)
			gp = NULL;
		if (ep) {
			if (ep[1]) {
				const char *glob = strchr(ep + 1, '*');
				if (!glob)
					gp = NULL;
				if (gp)
					rs[i].dst = xstrndup(ep + 1,
							     glob - ep - 1);
				else
					rs[i].dst = xstrdup(ep + 1);
			}
		} else {
			ep = sp + strlen(sp);
		}
		if (gp) {
			rs[i].pattern = 1;
			ep = gp;
		}
		rs[i].src = xstrndup(sp, ep - sp);
	}
	return rs;
}

struct remote *remote_get(const char *name)
{
	struct remote *ret;

	read_config();
	if (!name)
		name = default_remote_name;
	ret = make_remote(name, 0);
	if (name[0] != '/') {
		if (!ret->uri)
			read_remotes_file(ret);
		if (!ret->uri)
			read_branches_file(ret);
	}
	if (!ret->uri)
		add_uri(ret, name);
	if (!ret->uri)
		return NULL;
	ret->fetch = parse_ref_spec(ret->fetch_refspec_nr, ret->fetch_refspec);
	ret->push = parse_ref_spec(ret->push_refspec_nr, ret->push_refspec);
	return ret;
}

int for_each_remote(each_remote_fn fn, void *priv)
{
	int i, result = 0;
	read_config();
	for (i = 0; i < allocated_remotes && !result; i++) {
		struct remote *r = remotes[i];
		if (!r)
			continue;
		if (!r->fetch)
			r->fetch = parse_ref_spec(r->fetch_refspec_nr,
					r->fetch_refspec);
		if (!r->push)
			r->push = parse_ref_spec(r->push_refspec_nr,
					r->push_refspec);
		result = fn(r, priv);
	}
	return result;
}

int remote_has_uri(struct remote *remote, const char *uri)
{
	int i;
	for (i = 0; i < remote->uri_nr; i++) {
		if (!strcmp(remote->uri[i], uri))
			return 1;
	}
	return 0;
}

int remote_find_tracking(struct remote *remote, struct refspec *refspec)
{
	int find_src = refspec->src == NULL;
	char *needle, **result;
	int i;

	if (find_src) {
		if (refspec->dst == NULL)
			return error("find_tracking: need either src or dst");
		needle = refspec->dst;
		result = &refspec->src;
	} else {
		needle = refspec->src;
		result = &refspec->dst;
	}

	for (i = 0; i < remote->fetch_refspec_nr; i++) {
		struct refspec *fetch = &remote->fetch[i];
		const char *key = find_src ? fetch->dst : fetch->src;
		const char *value = find_src ? fetch->src : fetch->dst;
		if (!fetch->dst)
			continue;
		if (fetch->pattern) {
			if (!prefixcmp(needle, key)) {
				*result = xmalloc(strlen(value) +
						  strlen(needle) -
						  strlen(key) + 1);
				strcpy(*result, value);
				strcpy(*result + strlen(value),
				       needle + strlen(key));
				refspec->force = fetch->force;
				return 0;
			}
		} else if (!strcmp(needle, key)) {
			*result = xstrdup(value);
			refspec->force = fetch->force;
			return 0;
		}
	}
	return -1;
}

struct ref *alloc_ref(unsigned namelen)
{
	struct ref *ret = xmalloc(sizeof(struct ref) + namelen);
	memset(ret, 0, sizeof(struct ref) + namelen);
	return ret;
}

void free_refs(struct ref *ref)
{
	struct ref *next;
	while (ref) {
		next = ref->next;
		if (ref->peer_ref)
			free(ref->peer_ref);
		free(ref);
		ref = next;
	}
}

static int count_refspec_match(const char *pattern,
			       struct ref *refs,
			       struct ref **matched_ref)
{
	int patlen = strlen(pattern);
	struct ref *matched_weak = NULL;
	struct ref *matched = NULL;
	int weak_match = 0;
	int match = 0;

	for (weak_match = match = 0; refs; refs = refs->next) {
		char *name = refs->name;
		int namelen = strlen(name);

		if (namelen < patlen ||
		    memcmp(name + namelen - patlen, pattern, patlen))
			continue;
		if (namelen != patlen && name[namelen - patlen - 1] != '/')
			continue;

		/* A match is "weak" if it is with refs outside
		 * heads or tags, and did not specify the pattern
		 * in full (e.g. "refs/remotes/origin/master") or at
		 * least from the toplevel (e.g. "remotes/origin/master");
		 * otherwise "git push $URL master" would result in
		 * ambiguity between remotes/origin/master and heads/master
		 * at the remote site.
		 */
		if (namelen != patlen &&
		    patlen != namelen - 5 &&
		    prefixcmp(name, "refs/heads/") &&
		    prefixcmp(name, "refs/tags/")) {
			/* We want to catch the case where only weak
			 * matches are found and there are multiple
			 * matches, and where more than one strong
			 * matches are found, as ambiguous.  One
			 * strong match with zero or more weak matches
			 * are acceptable as a unique match.
			 */
			matched_weak = refs;
			weak_match++;
		}
		else {
			matched = refs;
			match++;
		}
	}
	if (!matched) {
		*matched_ref = matched_weak;
		return weak_match;
	}
	else {
		*matched_ref = matched;
		return match;
	}
}

static void tail_link_ref(struct ref *ref, struct ref ***tail)
{
	**tail = ref;
	while (ref->next)
		ref = ref->next;
	*tail = &ref->next;
}

static struct ref *try_explicit_object_name(const char *name)
{
	unsigned char sha1[20];
	struct ref *ref;
	int len;

	if (!*name) {
		ref = alloc_ref(20);
		strcpy(ref->name, "(delete)");
		hashclr(ref->new_sha1);
		return ref;
	}
	if (get_sha1(name, sha1))
		return NULL;
	len = strlen(name) + 1;
	ref = alloc_ref(len);
	memcpy(ref->name, name, len);
	hashcpy(ref->new_sha1, sha1);
	return ref;
}

static struct ref *make_linked_ref(const char *name, struct ref ***tail)
{
	struct ref *ret;
	size_t len;

	len = strlen(name) + 1;
	ret = alloc_ref(len);
	memcpy(ret->name, name, len);
	tail_link_ref(ret, tail);
	return ret;
}

static int match_explicit(struct ref *src, struct ref *dst,
			  struct ref ***dst_tail,
			  struct refspec *rs,
			  int errs)
{
	struct ref *matched_src, *matched_dst;

	const char *dst_value = rs->dst;

	if (rs->pattern)
		return errs;

	matched_src = matched_dst = NULL;
	switch (count_refspec_match(rs->src, src, &matched_src)) {
	case 1:
		break;
	case 0:
		/* The source could be in the get_sha1() format
		 * not a reference name.  :refs/other is a
		 * way to delete 'other' ref at the remote end.
		 */
		matched_src = try_explicit_object_name(rs->src);
		if (matched_src)
			break;
		error("src refspec %s does not match any.",
		      rs->src);
		break;
	default:
		matched_src = NULL;
		error("src refspec %s matches more than one.",
		      rs->src);
		break;
	}

	if (!matched_src)
		errs = 1;

	if (dst_value == NULL)
		dst_value = matched_src->name;

	switch (count_refspec_match(dst_value, dst, &matched_dst)) {
	case 1:
		break;
	case 0:
		if (!memcmp(dst_value, "refs/", 5))
			matched_dst = make_linked_ref(dst_value, dst_tail);
		else
			error("dst refspec %s does not match any "
			      "existing ref on the remote and does "
			      "not start with refs/.", dst_value);
		break;
	default:
		matched_dst = NULL;
		error("dst refspec %s matches more than one.",
		      dst_value);
		break;
	}
	if (errs || matched_dst == NULL)
		return 1;
	if (matched_dst->peer_ref) {
		errs = 1;
		error("dst ref %s receives from more than one src.",
		      matched_dst->name);
	}
	else {
		matched_dst->peer_ref = matched_src;
		matched_dst->force = rs->force;
	}
	return errs;
}

static int match_explicit_refs(struct ref *src, struct ref *dst,
			       struct ref ***dst_tail, struct refspec *rs,
			       int rs_nr)
{
	int i, errs;
	for (i = errs = 0; i < rs_nr; i++)
		errs |= match_explicit(src, dst, dst_tail, &rs[i], errs);
	return -errs;
}

static struct ref *find_ref_by_name(struct ref *list, const char *name)
{
	for ( ; list; list = list->next)
		if (!strcmp(list->name, name))
			return list;
	return NULL;
}

static const struct refspec *check_pattern_match(const struct refspec *rs,
						 int rs_nr,
						 const struct ref *src)
{
	int i;
	for (i = 0; i < rs_nr; i++) {
		if (rs[i].pattern && !prefixcmp(src->name, rs[i].src))
			return rs + i;
	}
	return NULL;
}

/*
 * Note. This is used only by "push"; refspec matching rules for
 * push and fetch are subtly different, so do not try to reuse it
 * without thinking.
 */
int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
	       int nr_refspec, char **refspec, int all)
{
	struct refspec *rs =
		parse_ref_spec(nr_refspec, (const char **) refspec);

	if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
		return -1;

	/* pick the remainder */
	for ( ; src; src = src->next) {
		struct ref *dst_peer;
		const struct refspec *pat = NULL;
		char *dst_name;
		if (src->peer_ref)
			continue;
		if (nr_refspec) {
			pat = check_pattern_match(rs, nr_refspec, src);
			if (!pat)
				continue;
		}
		else if (prefixcmp(src->name, "refs/heads/"))
			/*
			 * "matching refs"; traditionally we pushed everything
			 * including refs outside refs/heads/ hierarchy, but
			 * that does not make much sense these days.
			 */
			continue;

		if (pat) {
			const char *dst_side = pat->dst ? pat->dst : pat->src;
			dst_name = xmalloc(strlen(dst_side) +
					   strlen(src->name) -
					   strlen(pat->src) + 2);
			strcpy(dst_name, dst_side);
			strcat(dst_name, src->name + strlen(pat->src));
		} else
			dst_name = xstrdup(src->name);
		dst_peer = find_ref_by_name(dst, dst_name);
		if (dst_peer && dst_peer->peer_ref)
			/* We're already sending something to this ref. */
			goto free_name;
		if (!dst_peer && !nr_refspec && !all)
			/* Remote doesn't have it, and we have no
			 * explicit pattern, and we don't have
			 * --all. */
			goto free_name;
		if (!dst_peer) {
			/* Create a new one and link it */
			dst_peer = make_linked_ref(dst_name, dst_tail);
			hashcpy(dst_peer->new_sha1, src->new_sha1);
		}
		dst_peer->peer_ref = src;
	free_name:
		free(dst_name);
	}
	return 0;
}
Commit	Line	Data
5751f490 DB	1	#include "cache.h"
	2	#include "remote.h"
	3	#include "refs.h"
	4
	5	static struct remote **remotes;
	6	static int allocated_remotes;
	7
	8	#define BUF_SIZE (2048)
	9	static char buffer[BUF_SIZE];
	10
	11	static void add_push_refspec(struct remote remote, const char ref)
	12	{
	13	int nr = remote->push_refspec_nr + 1;
	14	remote->push_refspec =
	15	xrealloc(remote->push_refspec, nr * sizeof(char *));
	16	remote->push_refspec[nr-1] = ref;
	17	remote->push_refspec_nr = nr;
	18	}
	19
5d46c9d4 DB	20	static void add_fetch_refspec(struct remote remote, const char ref)
	21	{
	22	int nr = remote->fetch_refspec_nr + 1;
	23	remote->fetch_refspec =
	24	xrealloc(remote->fetch_refspec, nr * sizeof(char *));
	25	remote->fetch_refspec[nr-1] = ref;
	26	remote->fetch_refspec_nr = nr;
	27	}
	28
5751f490 DB	29	static void add_uri(struct remote remote, const char uri)
	30	{
	31	int nr = remote->uri_nr + 1;
	32	remote->uri =
	33	xrealloc(remote->uri, nr * sizeof(char *));
	34	remote->uri[nr-1] = uri;
	35	remote->uri_nr = nr;
	36	}
	37
	38	static struct remote make_remote(const char name, int len)
	39	{
	40	int i, empty = -1;
	41
	42	for (i = 0; i < allocated_remotes; i++) {
	43	if (!remotes[i]) {
	44	if (empty < 0)
	45	empty = i;
	46	} else {
	47	if (len ? (!strncmp(name, remotes[i]->name, len) &&
	48	!remotes[i]->name[len]) :
	49	!strcmp(name, remotes[i]->name))
	50	return remotes[i];
	51	}
	52	}
	53
	54	if (empty < 0) {
	55	empty = allocated_remotes;
	56	allocated_remotes += allocated_remotes ? allocated_remotes : 1;
	57	remotes = xrealloc(remotes,
	58	sizeof(remotes) allocated_remotes);
	59	memset(remotes + empty, 0,
	60	(allocated_remotes - empty) * sizeof(*remotes));
	61	}
	62	remotes[empty] = xcalloc(1, sizeof(struct remote));
	63	if (len)
	64	remotes[empty]->name = xstrndup(name, len);
	65	else
	66	remotes[empty]->name = xstrdup(name);
	67	return remotes[empty];
	68	}
	69
	70	static void read_remotes_file(struct remote *remote)
	71	{
	72	FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
	73
	74	if (!f)
	75	return;
	76	while (fgets(buffer, BUF_SIZE, f)) {
	77	int value_list;
	78	char s, p;
	79
	80	if (!prefixcmp(buffer, "URL:")) {
	81	value_list = 0;
	82	s = buffer + 4;
	83	} else if (!prefixcmp(buffer, "Push:")) {
	84	value_list = 1;
	85	s = buffer + 5;
5d46c9d4 DB	86	} else if (!prefixcmp(buffer, "Pull:")) {
	87	value_list = 2;
	88	s = buffer + 5;
5751f490 DB	89	} else
	90	continue;
	91
	92	while (isspace(*s))
	93	s++;
	94	if (!*s)
	95	continue;
	96
	97	p = s + strlen(s);
	98	while (isspace(p[-1]))
	99	*--p = 0;
	100
	101	switch (value_list) {
	102	case 0:
	103	add_uri(remote, xstrdup(s));
	104	break;
	105	case 1:
	106	add_push_refspec(remote, xstrdup(s));
	107	break;
5d46c9d4 DB	108	case 2:
	109	add_fetch_refspec(remote, xstrdup(s));
	110	break;
5751f490 DB	111	}
	112	}
	113	fclose(f);
	114	}
	115
	116	static void read_branches_file(struct remote *remote)
	117	{
	118	const char *slash = strchr(remote->name, '/');
	119	int n = slash ? slash - remote->name : 1000;
	120	FILE f = fopen(git_path("branches/%.s", n, remote->name), "r");
	121	char s, p;
	122	int len;
	123
	124	if (!f)
	125	return;
	126	s = fgets(buffer, BUF_SIZE, f);
	127	fclose(f);
	128	if (!s)
	129	return;
	130	while (isspace(*s))
	131	s++;
	132	if (!*s)
	133	return;
	134	p = s + strlen(s);
	135	while (isspace(p[-1]))
	136	*--p = 0;
	137	len = p - s;
	138	if (slash)
	139	len += strlen(slash);
	140	p = xmalloc(len + 1);
	141	strcpy(p, s);
	142	if (slash)
	143	strcat(p, slash);
	144	add_uri(remote, p);
	145	}
	146
	147	static char *default_remote_name = NULL;
	148	static const char *current_branch = NULL;
	149	static int current_branch_len = 0;
	150
	151	static int handle_config(const char key, const char value)
	152	{
	153	const char *name;
	154	const char *subkey;
	155	struct remote *remote;
	156	if (!prefixcmp(key, "branch.") && current_branch &&
	157	!strncmp(key + 7, current_branch, current_branch_len) &&
	158	!strcmp(key + 7 + current_branch_len, ".remote")) {
	159	free(default_remote_name);
	160	default_remote_name = xstrdup(value);
	161	}
	162	if (prefixcmp(key, "remote."))
	163	return 0;
	164	name = key + 7;
	165	subkey = strrchr(name, '.');
	166	if (!subkey)
	167	return error("Config with no key for remote %s", name);
	168	if (*subkey == '/') {
	169	warning("Config remote shorthand cannot begin with '/': %s", name);
	170	return 0;
	171	}
	172	remote = make_remote(name, subkey - name);
	173	if (!value) {
	174	/* if we ever have a boolean variable, e.g. "remote.*.disabled"
175	* [remote "frotz"]
176	* disabled
177	* is a valid way to set it to true; we get NULL in value so
178	* we need to handle it here.
179	*
180	* if (!strcmp(subkey, ".disabled")) {
181	* val = git_config_bool(key, value);
182	* return 0;
183	* } else
184	*
185	*/
186	return 0; /* ignore unknown booleans */
187	}
188	if (!strcmp(subkey, ".url")) {
189	add_uri(remote, xstrdup(value));
190	} else if (!strcmp(subkey, ".push")) {
191	add_push_refspec(remote, xstrdup(value));
5d46c9d4 DB	192	} else if (!strcmp(subkey, ".fetch")) {
5d46c9d4 DB	193	add_fetch_refspec(remote, xstrdup(value));
5751f490 DB	194	} else if (!strcmp(subkey, ".receivepack")) {
	195	if (!remote->receivepack)
	196	remote->receivepack = xstrdup(value);
	197	else
	198	error("more than one receivepack given, using the first");
0012ba21 DB	199	} else if (!strcmp(subkey, ".uploadpack")) {
	200	if (!remote->uploadpack)
	201	remote->uploadpack = xstrdup(value);
	202	else
	203	error("more than one uploadpack given, using the first");
5751f490 DB	204	}
	205	return 0;
	206	}
	207
	208	static void read_config(void)
	209	{
	210	unsigned char sha1[20];
	211	const char *head_ref;
	212	int flag;
	213	if (default_remote_name) // did this already
	214	return;
	215	default_remote_name = xstrdup("origin");
	216	current_branch = NULL;
	217	head_ref = resolve_ref("HEAD", sha1, 0, &flag);
	218	if (head_ref && (flag & REF_ISSYMREF) &&
	219	!prefixcmp(head_ref, "refs/heads/")) {
	220	current_branch = head_ref + strlen("refs/heads/");
	221	current_branch_len = strlen(current_branch);
	222	}
	223	git_config(handle_config);
	224	}
	225
6b62816c DB	226	static struct refspec parse_ref_spec(int nr_refspec, const char *refspec)
	227	{
	228	int i;
	229	struct refspec rs = xcalloc(sizeof(rs), nr_refspec);
	230	for (i = 0; i < nr_refspec; i++) {
	231	const char sp, ep, *gp;
	232	sp = refspec[i];
	233	if (*sp == '+') {
	234	rs[i].force = 1;
	235	sp++;
	236	}
	237	gp = strchr(sp, '*');
	238	ep = strchr(sp, ':');
	239	if (gp && ep && gp > ep)
	240	gp = NULL;
	241	if (ep) {
	242	if (ep[1]) {
	243	const char glob = strchr(ep + 1, '');
	244	if (!glob)
	245	gp = NULL;
	246	if (gp)
	247	rs[i].dst = xstrndup(ep + 1,
	248	glob - ep - 1);
	249	else
	250	rs[i].dst = xstrdup(ep + 1);
	251	}
	252	} else {
	253	ep = sp + strlen(sp);
	254	}
	255	if (gp) {
	256	rs[i].pattern = 1;
	257	ep = gp;
	258	}
	259	rs[i].src = xstrndup(sp, ep - sp);
	260	}
	261	return rs;
	262	}
	263
5751f490 DB	264	struct remote remote_get(const char name)
	265	{
	266	struct remote *ret;
	267
	268	read_config();
	269	if (!name)
	270	name = default_remote_name;
	271	ret = make_remote(name, 0);
	272	if (name[0] != '/') {
	273	if (!ret->uri)
	274	read_remotes_file(ret);
	275	if (!ret->uri)
	276	read_branches_file(ret);
	277	}
	278	if (!ret->uri)
	279	add_uri(ret, name);
	280	if (!ret->uri)
	281	return NULL;
5d46c9d4	282	ret->fetch = parse_ref_spec(ret->fetch_refspec_nr, ret->fetch_refspec);
6b62816c	283	ret->push = parse_ref_spec(ret->push_refspec_nr, ret->push_refspec);
5751f490 DB	284	return ret;
5751f490 DB	285	}
6b62816c	286
b42f6927 JS	287	int for_each_remote(each_remote_fn fn, void *priv)
	288	{
	289	int i, result = 0;
	290	read_config();
	291	for (i = 0; i < allocated_remotes && !result; i++) {
	292	struct remote *r = remotes[i];
	293	if (!r)
	294	continue;
	295	if (!r->fetch)
	296	r->fetch = parse_ref_spec(r->fetch_refspec_nr,
	297	r->fetch_refspec);
	298	if (!r->push)
	299	r->push = parse_ref_spec(r->push_refspec_nr,
	300	r->push_refspec);
	301	result = fn(r, priv);
	302	}
	303	return result;
	304	}
	305
5d46c9d4 DB	306	int remote_has_uri(struct remote remote, const char uri)
	307	{
	308	int i;
	309	for (i = 0; i < remote->uri_nr; i++) {
	310	if (!strcmp(remote->uri[i], uri))
	311	return 1;
	312	}
	313	return 0;
	314	}
	315
	316	int remote_find_tracking(struct remote remote, struct refspec refspec)
	317	{
b42f6927 JS	318	int find_src = refspec->src == NULL;
b42f6927 JS	319	char needle, *result;
5d46c9d4	320	int i;
b42f6927 JS	321
	322	if (find_src) {
	323	if (refspec->dst == NULL)
	324	return error("find_tracking: need either src or dst");
	325	needle = refspec->dst;
	326	result = &refspec->src;
	327	} else {
	328	needle = refspec->src;
	329	result = &refspec->dst;
	330	}
	331
5d46c9d4 DB	332	for (i = 0; i < remote->fetch_refspec_nr; i++) {
5d46c9d4 DB	333	struct refspec *fetch = &remote->fetch[i];
b42f6927 JS	334	const char *key = find_src ? fetch->dst : fetch->src;
b42f6927 JS	335	const char *value = find_src ? fetch->src : fetch->dst;
5d46c9d4 DB	336	if (!fetch->dst)
	337	continue;
	338	if (fetch->pattern) {
b42f6927 JS	339	if (!prefixcmp(needle, key)) {
	340	*result = xmalloc(strlen(value) +
	341	strlen(needle) -
	342	strlen(key) + 1);
	343	strcpy(*result, value);
	344	strcpy(*result + strlen(value),
	345	needle + strlen(key));
5d46c9d4 DB	346	refspec->force = fetch->force;
	347	return 0;
	348	}
b42f6927 JS	349	} else if (!strcmp(needle, key)) {
	350	*result = xstrdup(value);
	351	refspec->force = fetch->force;
	352	return 0;
5d46c9d4 DB	353	}
5d46c9d4 DB	354	}
5d46c9d4 DB	355	return -1;
	356	}
	357
dfd255dd DB	358	struct ref *alloc_ref(unsigned namelen)
	359	{
	360	struct ref *ret = xmalloc(sizeof(struct ref) + namelen);
	361	memset(ret, 0, sizeof(struct ref) + namelen);
	362	return ret;
	363	}
	364
	365	void free_refs(struct ref *ref)
	366	{
	367	struct ref *next;
	368	while (ref) {
	369	next = ref->next;
	370	if (ref->peer_ref)
	371	free(ref->peer_ref);
	372	free(ref);
	373	ref = next;
	374	}
	375	}
	376
6b62816c DB	377	static int count_refspec_match(const char *pattern,
	378	struct ref *refs,
	379	struct ref **matched_ref)
	380	{
	381	int patlen = strlen(pattern);
	382	struct ref *matched_weak = NULL;
	383	struct ref *matched = NULL;
	384	int weak_match = 0;
	385	int match = 0;
	386
	387	for (weak_match = match = 0; refs; refs = refs->next) {
	388	char *name = refs->name;
	389	int namelen = strlen(name);
6b62816c DB	390
	391	if (namelen < patlen \|\|
	392	memcmp(name + namelen - patlen, pattern, patlen))
	393	continue;
	394	if (namelen != patlen && name[namelen - patlen - 1] != '/')
	395	continue;
	396
	397	/* A match is "weak" if it is with refs outside
	398	* heads or tags, and did not specify the pattern
	399	* in full (e.g. "refs/remotes/origin/master") or at
	400	* least from the toplevel (e.g. "remotes/origin/master");
	401	* otherwise "git push $URL master" would result in
	402	* ambiguity between remotes/origin/master and heads/master
	403	* at the remote site.
	404	*/
	405	if (namelen != patlen &&
	406	patlen != namelen - 5 &&
	407	prefixcmp(name, "refs/heads/") &&
	408	prefixcmp(name, "refs/tags/")) {
	409	/* We want to catch the case where only weak
	410	* matches are found and there are multiple
	411	* matches, and where more than one strong
	412	* matches are found, as ambiguous. One
	413	* strong match with zero or more weak matches
	414	* are acceptable as a unique match.
	415	*/
	416	matched_weak = refs;
	417	weak_match++;
	418	}
	419	else {
	420	matched = refs;
	421	match++;
	422	}
	423	}
	424	if (!matched) {
	425	*matched_ref = matched_weak;
	426	return weak_match;
	427	}
	428	else {
	429	*matched_ref = matched;
	430	return match;
	431	}
	432	}
	433
1d735267	434	static void tail_link_ref(struct ref ref, struct ref **tail)
6b62816c DB	435	{
6b62816c DB	436	**tail = ref;
1d735267 DB	437	while (ref->next)
1d735267 DB	438	ref = ref->next;
6b62816c	439	*tail = &ref->next;
6b62816c DB	440	}
	441
	442	static struct ref try_explicit_object_name(const char name)
	443	{
	444	unsigned char sha1[20];
	445	struct ref *ref;
	446	int len;
	447
	448	if (!*name) {
dfd255dd	449	ref = alloc_ref(20);
6b62816c DB	450	strcpy(ref->name, "(delete)");
	451	hashclr(ref->new_sha1);
	452	return ref;
	453	}
	454	if (get_sha1(name, sha1))
	455	return NULL;
	456	len = strlen(name) + 1;
dfd255dd	457	ref = alloc_ref(len);
6b62816c DB	458	memcpy(ref->name, name, len);
	459	hashcpy(ref->new_sha1, sha1);
	460	return ref;
	461	}
	462
1d735267	463	static struct ref make_linked_ref(const char name, struct ref ***tail)
6b62816c	464	{
1d735267	465	struct ref *ret;
163f0ee5	466	size_t len;
6b62816c	467
163f0ee5	468	len = strlen(name) + 1;
1d735267 DB	469	ret = alloc_ref(len);
	470	memcpy(ret->name, name, len);
	471	tail_link_ref(ret, tail);
	472	return ret;
163f0ee5	473	}
8558fd9e	474
54a8ad92 JH	475	static int match_explicit(struct ref src, struct ref dst,
	476	struct ref ***dst_tail,
	477	struct refspec *rs,
	478	int errs)
6b62816c	479	{
54a8ad92	480	struct ref matched_src, matched_dst;
8558fd9e	481
54a8ad92	482	const char *dst_value = rs->dst;
6b62816c	483
54a8ad92 JH	484	if (rs->pattern)
54a8ad92 JH	485	return errs;
8558fd9e	486
54a8ad92 JH	487	matched_src = matched_dst = NULL;
	488	switch (count_refspec_match(rs->src, src, &matched_src)) {
	489	case 1:
	490	break;
	491	case 0:
	492	/* The source could be in the get_sha1() format
	493	* not a reference name. :refs/other is a
	494	* way to delete 'other' ref at the remote end.
	495	*/
	496	matched_src = try_explicit_object_name(rs->src);
	497	if (matched_src)
6b62816c	498	break;
54a8ad92 JH	499	error("src refspec %s does not match any.",
	500	rs->src);
	501	break;
	502	default:
3c8b7df1	503	matched_src = NULL;
54a8ad92 JH	504	error("src refspec %s matches more than one.",
	505	rs->src);
	506	break;
	507	}
3c8b7df1 JH	508
	509	if (!matched_src)
	510	errs = 1;
	511
	512	if (dst_value == NULL)
1ed10b88	513	dst_value = matched_src->name;
3c8b7df1	514
54a8ad92 JH	515	switch (count_refspec_match(dst_value, dst, &matched_dst)) {
	516	case 1:
	517	break;
	518	case 0:
163f0ee5	519	if (!memcmp(dst_value, "refs/", 5))
1d735267	520	matched_dst = make_linked_ref(dst_value, dst_tail);
3c8b7df1	521	else
54a8ad92 JH	522	error("dst refspec %s does not match any "
	523	"existing ref on the remote and does "
	524	"not start with refs/.", dst_value);
54a8ad92 JH	525	break;
54a8ad92 JH	526	default:
3c8b7df1	527	matched_dst = NULL;
54a8ad92 JH	528	error("dst refspec %s matches more than one.",
	529	dst_value);
	530	break;
	531	}
3c8b7df1 JH	532	if (errs \|\| matched_dst == NULL)
3c8b7df1 JH	533	return 1;
54a8ad92 JH	534	if (matched_dst->peer_ref) {
	535	errs = 1;
	536	error("dst ref %s receives from more than one src.",
	537	matched_dst->name);
6b62816c	538	}
54a8ad92 JH	539	else {
	540	matched_dst->peer_ref = matched_src;
	541	matched_dst->force = rs->force;
6b62816c	542	}
54a8ad92 JH	543	return errs;
	544	}
	545
	546	static int match_explicit_refs(struct ref src, struct ref dst,
	547	struct ref **dst_tail, struct refspec rs,
	548	int rs_nr)
	549	{
	550	int i, errs;
	551	for (i = errs = 0; i < rs_nr; i++)
	552	errs \|= match_explicit(src, dst, dst_tail, &rs[i], errs);
6b62816c DB	553	return -errs;
	554	}
	555
	556	static struct ref find_ref_by_name(struct ref list, const char *name)
	557	{
	558	for ( ; list; list = list->next)
	559	if (!strcmp(list->name, name))
	560	return list;
	561	return NULL;
	562	}
	563
6e66bf3c AR	564	static const struct refspec check_pattern_match(const struct refspec rs,
	565	int rs_nr,
	566	const struct ref *src)
8558fd9e DB	567	{
8558fd9e DB	568	int i;
8558fd9e DB	569	for (i = 0; i < rs_nr; i++) {
8558fd9e DB	570	if (rs[i].pattern && !prefixcmp(src->name, rs[i].src))
6e66bf3c	571	return rs + i;
8558fd9e	572	}
6e66bf3c	573	return NULL;
8558fd9e DB	574	}
8558fd9e DB	575
54a8ad92 JH	576	/*
	577	* Note. This is used only by "push"; refspec matching rules for
	578	* push and fetch are subtly different, so do not try to reuse it
	579	* without thinking.
	580	*/
6b62816c DB	581	int match_refs(struct ref src, struct ref dst, struct ref ***dst_tail,
	582	int nr_refspec, char **refspec, int all)
	583	{
	584	struct refspec *rs =
	585	parse_ref_spec(nr_refspec, (const char **) refspec);
	586
8558fd9e DB	587	if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
8558fd9e DB	588	return -1;
6b62816c DB	589
	590	/* pick the remainder */
	591	for ( ; src; src = src->next) {
	592	struct ref *dst_peer;
6e66bf3c AR	593	const struct refspec *pat = NULL;
6e66bf3c AR	594	char *dst_name;
6b62816c DB	595	if (src->peer_ref)
6b62816c DB	596	continue;
6e66bf3c AR	597	if (nr_refspec) {
	598	pat = check_pattern_match(rs, nr_refspec, src);
	599	if (!pat)
	600	continue;
	601	}
098e711e JH	602	else if (prefixcmp(src->name, "refs/heads/"))
	603	/*
	604	* "matching refs"; traditionally we pushed everything
	605	* including refs outside refs/heads/ hierarchy, but
	606	* that does not make much sense these days.
	607	*/
	608	continue;
8558fd9e	609
6e66bf3c	610	if (pat) {
efd8f793 DB	611	const char *dst_side = pat->dst ? pat->dst : pat->src;
efd8f793 DB	612	dst_name = xmalloc(strlen(dst_side) +
6e66bf3c AR	613	strlen(src->name) -
6e66bf3c AR	614	strlen(pat->src) + 2);
efd8f793	615	strcpy(dst_name, dst_side);
6e66bf3c AR	616	strcat(dst_name, src->name + strlen(pat->src));
6e66bf3c AR	617	} else
aa32eedc	618	dst_name = xstrdup(src->name);
6e66bf3c	619	dst_peer = find_ref_by_name(dst, dst_name);
8558fd9e DB	620	if (dst_peer && dst_peer->peer_ref)
8558fd9e DB	621	/* We're already sending something to this ref. */
6e66bf3c	622	goto free_name;
8558fd9e DB	623	if (!dst_peer && !nr_refspec && !all)
	624	/* Remote doesn't have it, and we have no
	625	* explicit pattern, and we don't have
	626	* --all. */
6e66bf3c	627	goto free_name;
6b62816c DB	628	if (!dst_peer) {
6b62816c DB	629	/* Create a new one and link it */
1d735267	630	dst_peer = make_linked_ref(dst_name, dst_tail);
6b62816c	631	hashcpy(dst_peer->new_sha1, src->new_sha1);
6b62816c DB	632	}
6b62816c DB	633	dst_peer->peer_ref = src;
6e66bf3c AR	634	free_name:
6e66bf3c AR	635	free(dst_name);
6b62816c DB	636	}
	637	return 0;
	638	}