[thirdparty/git.git] / connect.c

#include "cache.h"
#include "pkt-line.h"
#include "quote.h"
#include "refs.h"
#include <sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

static char *server_capabilities = NULL;

/*
 * Read all the refs from the other end
 */
struct ref **get_remote_heads(int in, struct ref **list,
			      int nr_match, char **match, int ignore_funny)
{
	*list = NULL;
	for (;;) {
		struct ref *ref;
		unsigned char old_sha1[20];
		static char buffer[1000];
		char *name;
		int len, name_len;

		len = packet_read_line(in, buffer, sizeof(buffer));
		if (!len)
			break;
		if (buffer[len-1] == '\n')
			buffer[--len] = 0;

		if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
			die("protocol error: expected sha/ref, got '%s'", buffer);
		name = buffer + 41;

		name_len = strlen(name);
		if (len != name_len + 41) {
			if (server_capabilities)
				free(server_capabilities);
			server_capabilities = strdup(name + name_len + 1);
		}

		if (ignore_funny && 45 < len && !memcmp(name, "refs/", 5) &&
		    check_ref_format(name + 5))
			continue;

		if (nr_match && !path_match(name, nr_match, match))
			continue;
		ref = xcalloc(1, sizeof(*ref) + len - 40);
		memcpy(ref->old_sha1, old_sha1, 20);
		memcpy(ref->name, buffer + 41, len - 40);
		*list = ref;
		list = &ref->next;
	}
	return list;
}

int server_supports(const char *feature)
{
	return server_capabilities &&
		strstr(server_capabilities, feature) != NULL;
}

int get_ack(int fd, unsigned char *result_sha1)
{
	static char line[1000];
	int len = packet_read_line(fd, line, sizeof(line));

	if (!len)
		die("git-fetch-pack: expected ACK/NAK, got EOF");
	if (line[len-1] == '\n')
		line[--len] = 0;
	if (!strcmp(line, "NAK"))
		return 0;
	if (!strncmp(line, "ACK ", 3)) {
		if (!get_sha1_hex(line+4, result_sha1)) {
			if (strstr(line+45, "continue"))
				return 2;
			return 1;
		}
	}
	die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
}

int path_match(const char *path, int nr, char **match)
{
	int i;
	int pathlen = strlen(path);

	for (i = 0; i < nr; i++) {
		char *s = match[i];
		int len = strlen(s);

		if (!len || len > pathlen)
			continue;
		if (memcmp(path + pathlen - len, s, len))
			continue;
		if (pathlen > len && path[pathlen - len - 1] != '/')
			continue;
		*s = 0;
		return 1;
	}
	return 0;
}

struct refspec {
	char *src;
	char *dst;
	char force;
};

/*
 * A:B means fast forward remote B with local A.
 * +A:B means overwrite remote B with local A.
 * +A is a shorthand for +A:A.
 * A is a shorthand for A:A.
 */
static struct refspec *parse_ref_spec(int nr_refspec, char **refspec)
{
	int i;
	struct refspec *rs = xcalloc(sizeof(*rs), (nr_refspec + 1));
	for (i = 0; i < nr_refspec; i++) {
		char *sp, *dp, *ep;
		sp = refspec[i];
		if (*sp == '+') {
			rs[i].force = 1;
			sp++;
		}
		ep = strchr(sp, ':');
		if (ep) {
			dp = ep + 1;
			*ep = 0;
		}
		else
			dp = sp;
		rs[i].src = sp;
		rs[i].dst = dp;
	}
	rs[nr_refspec].src = rs[nr_refspec].dst = NULL;
	return rs;
}

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

	for (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;
		match++;
		*matched_ref = refs;
	}
	return match;
}

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

static struct ref *try_explicit_object_name(const char *name)
{
	unsigned char sha1[20];
	struct ref *ref;
	int len;
	if (get_sha1(name, sha1))
		return NULL;
	len = strlen(name) + 1;
	ref = xcalloc(1, sizeof(*ref) + len);
	memcpy(ref->name, name, len);
	memcpy(ref->new_sha1, sha1, 20);
	return ref;
}

static int match_explicit_refs(struct ref *src, struct ref *dst,
			       struct ref ***dst_tail, struct refspec *rs)
{
	int i, errs;
	for (i = errs = 0; rs[i].src; i++) {
		struct ref *matched_src, *matched_dst;

		matched_src = matched_dst = NULL;
		switch (count_refspec_match(rs[i].src, src, &matched_src)) {
		case 1:
			break;
		case 0:
			/* The source could be in the get_sha1() format
			 * not a reference name.
			 */
			matched_src = try_explicit_object_name(rs[i].src);
			if (matched_src)
				break;
			errs = 1;
			error("src refspec %s does not match any.",
			      rs[i].src);
			break;
		default:
			errs = 1;
			error("src refspec %s matches more than one.",
			      rs[i].src);
			break;
		}
		switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) {
		case 1:
			break;
		case 0:
			if (!memcmp(rs[i].dst, "refs/", 5)) {
				int len = strlen(rs[i].dst) + 1;
				matched_dst = xcalloc(1, sizeof(*dst) + len);
				memcpy(matched_dst->name, rs[i].dst, len);
				link_dst_tail(matched_dst, dst_tail);
			}
			else if (!strcmp(rs[i].src, rs[i].dst) &&
				 matched_src) {
				/* pushing "master:master" when
				 * remote does not have master yet.
				 */
				int len = strlen(matched_src->name) + 1;
				matched_dst = xcalloc(1, sizeof(*dst) + len);
				memcpy(matched_dst->name, matched_src->name,
				       len);
				link_dst_tail(matched_dst, dst_tail);
			}
			else {
				errs = 1;
				error("dst refspec %s does not match any "
				      "existing ref on the remote and does "
				      "not start with refs/.", rs[i].dst);
			}
			break;
		default:
			errs = 1;
			error("dst refspec %s matches more than one.",
			      rs[i].dst);
			break;
		}
		if (errs)
			continue;
		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[i].force;
		}
	}
	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;
}

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, refspec);

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

	/* pick the remainder */
	for ( ; src; src = src->next) {
		struct ref *dst_peer;
		if (src->peer_ref)
			continue;
		dst_peer = find_ref_by_name(dst, src->name);
		if ((dst_peer && dst_peer->peer_ref) || (!dst_peer && !all))
			continue;
		if (!dst_peer) {
			/* Create a new one and link it */
			int len = strlen(src->name) + 1;
			dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
			memcpy(dst_peer->name, src->name, len);
			memcpy(dst_peer->new_sha1, src->new_sha1, 20);
			link_dst_tail(dst_peer, dst_tail);
		}
		dst_peer->peer_ref = src;
	}
	return 0;
}

enum protocol {
	PROTO_LOCAL = 1,
	PROTO_SSH,
	PROTO_GIT,
};

static enum protocol get_protocol(const char *name)
{
	if (!strcmp(name, "ssh"))
		return PROTO_SSH;
	if (!strcmp(name, "git"))
		return PROTO_GIT;
	if (!strcmp(name, "git+ssh"))
		return PROTO_SSH;
	if (!strcmp(name, "ssh+git"))
		return PROTO_SSH;
	die("I don't handle protocol '%s'", name);
}

#define STR_(s)	# s
#define STR(s)	STR_(s)

#ifndef NO_IPV6

static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
{
	int sockfd = -1;
	char *colon, *end;
	char *port = STR(DEFAULT_GIT_PORT);
	struct addrinfo hints, *ai0, *ai;
	int gai;

	if (host[0] == '[') {
		end = strchr(host + 1, ']');
		if (end) {
			*end = 0;
			end++;
			host++;
		} else
			end = host;
	} else
		end = host;
	colon = strchr(end, ':');

	if (colon) {
		*colon = 0;
		port = colon + 1;
	}

	memset(&hints, 0, sizeof(hints));
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_protocol = IPPROTO_TCP;

	gai = getaddrinfo(host, port, &hints, &ai);
	if (gai)
		die("Unable to look up %s (%s)", host, gai_strerror(gai));

	for (ai0 = ai; ai; ai = ai->ai_next) {
		sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
		if (sockfd < 0)
			continue;
		if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
			close(sockfd);
			sockfd = -1;
			continue;
		}
		break;
	}

	freeaddrinfo(ai0);

	if (sockfd < 0)
		die("unable to connect a socket (%s)", strerror(errno));

	fd[0] = sockfd;
	fd[1] = sockfd;
	packet_write(sockfd, "%s %s\n", prog, path);
	return 0;
}

#else /* NO_IPV6 */

static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
{
	int sockfd = -1;
	char *colon, *end;
	char *port = STR(DEFAULT_GIT_PORT), *ep;
	struct hostent *he;
	struct sockaddr_in sa;
	char **ap;
	unsigned int nport;

	if (host[0] == '[') {
		end = strchr(host + 1, ']');
		if (end) {
			*end = 0;
			end++;
			host++;
		} else
			end = host;
	} else
		end = host;
	colon = strchr(end, ':');

	if (colon) {
		*colon = 0;
		port = colon + 1;
	}


	he = gethostbyname(host);
	if (!he)
		die("Unable to look up %s (%s)", host, hstrerror(h_errno));
	nport = strtoul(port, &ep, 10);
	if ( ep == port || *ep ) {
		/* Not numeric */
		struct servent *se = getservbyname(port,"tcp");
		if ( !se )
			die("Unknown port %s\n", port);
		nport = se->s_port;
	}

	for (ap = he->h_addr_list; *ap; ap++) {
		sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
		if (sockfd < 0)
			continue;

		memset(&sa, 0, sizeof sa);
		sa.sin_family = he->h_addrtype;
		sa.sin_port = htons(nport);
		memcpy(&sa.sin_addr, *ap, he->h_length);

		if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
			close(sockfd);
			sockfd = -1;
			continue;
		}
		break;
	}

	if (sockfd < 0)
		die("unable to connect a socket (%s)", strerror(errno));

	fd[0] = sockfd;
	fd[1] = sockfd;
	packet_write(sockfd, "%s %s\n", prog, path);
	return 0;
}

#endif /* NO_IPV6 */

static char *git_proxy_command = NULL;
static const char *rhost_name = NULL;
static int rhost_len;

static int git_proxy_command_options(const char *var, const char *value)
{
	if (!strcmp(var, "core.gitproxy")) {
		const char *for_pos;
		int matchlen = -1;
		int hostlen;

		if (git_proxy_command)
			return 0;
		/* [core]
		 * ;# matches www.kernel.org as well
		 * gitproxy = netcatter-1 for kernel.org
		 * gitproxy = netcatter-2 for sample.xz
		 * gitproxy = netcatter-default
		 */
		for_pos = strstr(value, " for ");
		if (!for_pos)
			/* matches everybody */
			matchlen = strlen(value);
		else {
			hostlen = strlen(for_pos + 5);
			if (rhost_len < hostlen)
				matchlen = -1;
			else if (!strncmp(for_pos + 5,
					  rhost_name + rhost_len - hostlen,
					  hostlen) &&
				 ((rhost_len == hostlen) ||
				  rhost_name[rhost_len - hostlen -1] == '.'))
				matchlen = for_pos - value;
			else
				matchlen = -1;
		}
		if (0 <= matchlen) {
			/* core.gitproxy = none for kernel.org */
			if (matchlen == 4 && 
			    !memcmp(value, "none", 4))
				matchlen = 0;
			git_proxy_command = xmalloc(matchlen + 1);
			memcpy(git_proxy_command, value, matchlen);
			git_proxy_command[matchlen] = 0;
		}
		return 0;
	}

	return git_default_config(var, value);
}

static int git_use_proxy(const char *host)
{
	rhost_name = host;
	rhost_len = strlen(host);
	git_proxy_command = getenv("GIT_PROXY_COMMAND");
	git_config(git_proxy_command_options);
	rhost_name = NULL;
	return (git_proxy_command && *git_proxy_command);
}

static int git_proxy_connect(int fd[2], const char *prog, char *host, char *path)
{
	char *port = STR(DEFAULT_GIT_PORT);
	char *colon, *end;
	int pipefd[2][2];
	pid_t pid;

	if (host[0] == '[') {
		end = strchr(host + 1, ']');
		if (end) {
			*end = 0;
			end++;
			host++;
		} else
			end = host;
	} else
		end = host;
	colon = strchr(end, ':');

	if (colon) {
		*colon = 0;
		port = colon + 1;
	}

	if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
		die("unable to create pipe pair for communication");
	pid = fork();
	if (!pid) {
		dup2(pipefd[1][0], 0);
		dup2(pipefd[0][1], 1);
		close(pipefd[0][0]);
		close(pipefd[0][1]);
		close(pipefd[1][0]);
		close(pipefd[1][1]);
		execlp(git_proxy_command, git_proxy_command, host, port, NULL);
		die("exec failed");
	}
	fd[0] = pipefd[0][0];
	fd[1] = pipefd[1][1];
	close(pipefd[0][1]);
	close(pipefd[1][0]);
	packet_write(fd[1], "%s %s\n", prog, path);
	return pid;
}

/*
 * Yeah, yeah, fixme. Need to pass in the heads etc.
 */
int git_connect(int fd[2], char *url, const char *prog)
{
	char command[1024];
	char *host, *path = url;
	char *end;
	int c;
	int pipefd[2][2];
	pid_t pid;
	enum protocol protocol = PROTO_LOCAL;

	host = strstr(url, "://");
	if(host) {
		*host = '\0';
		protocol = get_protocol(url);
		host += 3;
		c = '/';
	} else {
		host = url;
		c = ':';
	}

	if (host[0] == '[') {
		end = strchr(host + 1, ']');
		if (end) {
			*end = 0;
			end++;
			host++;
		} else
			end = host;
	} else
		end = host;

	path = strchr(end, c);
	if (c == ':') {
		if (path) {
			protocol = PROTO_SSH;
			*path++ = '\0';
		} else
			path = host;
	}

	if (!path || !*path)
		die("No path specified. See 'man git-pull' for valid url syntax");

	/*
	 * null-terminate hostname and point path to ~ for URL's like this:
	 *    ssh://host.xz/~user/repo
	 */
	if (protocol != PROTO_LOCAL && host != url) {
		char *ptr = path;
		if (path[1] == '~')
			path++;
		else
			path = strdup(ptr);

		*ptr = '\0';
	}

	if (protocol == PROTO_GIT) {
		if (git_use_proxy(host))
			return git_proxy_connect(fd, prog, host, path);
		return git_tcp_connect(fd, prog, host, path);
	}

	if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
		die("unable to create pipe pair for communication");
	pid = fork();
	if (!pid) {
		snprintf(command, sizeof(command), "%s %s", prog,
			 sq_quote(path));
		dup2(pipefd[1][0], 0);
		dup2(pipefd[0][1], 1);
		close(pipefd[0][0]);
		close(pipefd[0][1]);
		close(pipefd[1][0]);
		close(pipefd[1][1]);
		if (protocol == PROTO_SSH) {
			const char *ssh, *ssh_basename;
			ssh = getenv("GIT_SSH");
			if (!ssh) ssh = "ssh";
			ssh_basename = strrchr(ssh, '/');
			if (!ssh_basename)
				ssh_basename = ssh;
			else
				ssh_basename++;
			execlp(ssh, ssh_basename, host, command, NULL);
		}
		else {
			unsetenv(ALTERNATE_DB_ENVIRONMENT);
			unsetenv(DB_ENVIRONMENT);
			unsetenv(GIT_DIR_ENVIRONMENT);
			unsetenv(GRAFT_ENVIRONMENT);
			unsetenv(INDEX_ENVIRONMENT);
			execlp("sh", "sh", "-c", command, NULL);
		}
		die("exec failed");
	}
	fd[0] = pipefd[0][0];
	fd[1] = pipefd[1][1];
	close(pipefd[0][1]);
	close(pipefd[1][0]);
	return pid;
}

int finish_connect(pid_t pid)
{
	int ret;

	for (;;) {
		ret = waitpid(pid, NULL, 0);
		if (!ret)
			break;
		if (errno != EINTR)
			break;
	}
	return ret;
}
Commit	Line	Data
f7192598	1	#include "cache.h"
41cb7488	2	#include "pkt-line.h"
b10d0ec7	3	#include "quote.h"
6abf5c0c	4	#include "refs.h"
f7192598	5	#include <sys/wait.h>
2386d658 LT	6	#include <sys/socket.h>
	7	#include <netinet/in.h>
	8	#include <arpa/inet.h>
	9	#include <netdb.h>
f7192598	10
1f5881bb	11	static char *server_capabilities = NULL;
211b5f9e	12
d1c133f5 LT	13	/*
	14	* Read all the refs from the other end
	15	*/
1a7141ff JH	16	struct ref get_remote_heads(int in, struct ref list,
1a7141ff JH	17	int nr_match, char **match, int ignore_funny)
d1c133f5 LT	18	{
	19	*list = NULL;
	20	for (;;) {
	21	struct ref *ref;
	22	unsigned char old_sha1[20];
	23	static char buffer[1000];
	24	char *name;
211b5f9e	25	int len, name_len;
d1c133f5 LT	26
	27	len = packet_read_line(in, buffer, sizeof(buffer));
	28	if (!len)
	29	break;
	30	if (buffer[len-1] == '\n')
	31	buffer[--len] = 0;
	32
	33	if (len < 42 \|\| get_sha1_hex(buffer, old_sha1) \|\| buffer[40] != ' ')
	34	die("protocol error: expected sha/ref, got '%s'", buffer);
	35	name = buffer + 41;
1a7141ff	36
211b5f9e JS	37	name_len = strlen(name);
	38	if (len != name_len + 41) {
	39	if (server_capabilities)
	40	free(server_capabilities);
	41	server_capabilities = strdup(name + name_len + 1);
	42	}
	43
cfee10a7 JH	44	if (ignore_funny && 45 < len && !memcmp(name, "refs/", 5) &&
	45	check_ref_format(name + 5))
	46	continue;
	47
d1c133f5 LT	48	if (nr_match && !path_match(name, nr_match, match))
d1c133f5 LT	49	continue;
f88395ac	50	ref = xcalloc(1, sizeof(*ref) + len - 40);
d1c133f5	51	memcpy(ref->old_sha1, old_sha1, 20);
d1c133f5	52	memcpy(ref->name, buffer + 41, len - 40);
d1c133f5 LT	53	*list = ref;
	54	list = &ref->next;
	55	}
	56	return list;
	57	}
	58
211b5f9e JS	59	int server_supports(const char *feature)
211b5f9e JS	60	{
1f5881bb JS	61	return server_capabilities &&
1f5881bb JS	62	strstr(server_capabilities, feature) != NULL;
211b5f9e JS	63	}
211b5f9e JS	64
41cb7488 LT	65	int get_ack(int fd, unsigned char *result_sha1)
	66	{
	67	static char line[1000];
	68	int len = packet_read_line(fd, line, sizeof(line));
	69
	70	if (!len)
	71	die("git-fetch-pack: expected ACK/NAK, got EOF");
	72	if (line[len-1] == '\n')
	73	line[--len] = 0;
	74	if (!strcmp(line, "NAK"))
	75	return 0;
	76	if (!strncmp(line, "ACK ", 3)) {
c4c86f07 JS	77	if (!get_sha1_hex(line+4, result_sha1)) {
	78	if (strstr(line+45, "continue"))
	79	return 2;
41cb7488	80	return 1;
c4c86f07	81	}
41cb7488 LT	82	}
	83	die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
	84	}
	85
013e7c7f LT	86	int path_match(const char path, int nr, char *match)
	87	{
	88	int i;
	89	int pathlen = strlen(path);
	90
	91	for (i = 0; i < nr; i++) {
	92	char *s = match[i];
	93	int len = strlen(s);
	94
	95	if (!len \|\| len > pathlen)
	96	continue;
	97	if (memcmp(path + pathlen - len, s, len))
	98	continue;
	99	if (pathlen > len && path[pathlen - len - 1] != '/')
	100	continue;
	101	*s = 0;
	102	return 1;
	103	}
	104	return 0;
	105	}
	106
f88395ac JH	107	struct refspec {
	108	char *src;
	109	char *dst;
ff27adf3	110	char force;
f88395ac JH	111	};
f88395ac JH	112
ff27adf3 JH	113	/*
	114	* A:B means fast forward remote B with local A.
	115	* +A:B means overwrite remote B with local A.
	116	* +A is a shorthand for +A:A.
	117	* A is a shorthand for A:A.
	118	*/
f88395ac JH	119	static struct refspec parse_ref_spec(int nr_refspec, char *refspec)
	120	{
	121	int i;
ff27adf3	122	struct refspec rs = xcalloc(sizeof(rs), (nr_refspec + 1));
f88395ac JH	123	for (i = 0; i < nr_refspec; i++) {
	124	char sp, dp, *ep;
	125	sp = refspec[i];
ff27adf3 JH	126	if (*sp == '+') {
	127	rs[i].force = 1;
	128	sp++;
	129	}
f88395ac JH	130	ep = strchr(sp, ':');
	131	if (ep) {
	132	dp = ep + 1;
	133	*ep = 0;
	134	}
	135	else
	136	dp = sp;
	137	rs[i].src = sp;
	138	rs[i].dst = dp;
	139	}
	140	rs[nr_refspec].src = rs[nr_refspec].dst = NULL;
	141	return rs;
	142	}
	143
	144	static int count_refspec_match(const char *pattern,
	145	struct ref *refs,
	146	struct ref **matched_ref)
	147	{
	148	int match;
	149	int patlen = strlen(pattern);
	150
	151	for (match = 0; refs; refs = refs->next) {
	152	char *name = refs->name;
	153	int namelen = strlen(name);
	154	if (namelen < patlen \|\|
	155	memcmp(name + namelen - patlen, pattern, patlen))
	156	continue;
	157	if (namelen != patlen && name[namelen - patlen - 1] != '/')
	158	continue;
	159	match++;
	160	*matched_ref = refs;
	161	}
	162	return match;
	163	}
	164
	165	static void link_dst_tail(struct ref ref, struct ref **tail)
	166	{
	167	**tail = ref;
	168	*tail = &ref->next;
	169	**tail = NULL;
	170	}
	171
15e02b37 JH	172	static struct ref try_explicit_object_name(const char name)
	173	{
	174	unsigned char sha1[20];
	175	struct ref *ref;
	176	int len;
	177	if (get_sha1(name, sha1))
	178	return NULL;
	179	len = strlen(name) + 1;
	180	ref = xcalloc(1, sizeof(*ref) + len);
	181	memcpy(ref->name, name, len);
	182	memcpy(ref->new_sha1, sha1, 20);
	183	return ref;
	184	}
	185
f88395ac JH	186	static int match_explicit_refs(struct ref src, struct ref dst,
	187	struct ref **dst_tail, struct refspec rs)
	188	{
	189	int i, errs;
	190	for (i = errs = 0; rs[i].src; i++) {
	191	struct ref matched_src, matched_dst;
	192
	193	matched_src = matched_dst = NULL;
	194	switch (count_refspec_match(rs[i].src, src, &matched_src)) {
	195	case 1:
	196	break;
	197	case 0:
15e02b37 JH	198	/* The source could be in the get_sha1() format
	199	* not a reference name.
	200	*/
	201	matched_src = try_explicit_object_name(rs[i].src);
	202	if (matched_src)
	203	break;
f88395ac	204	errs = 1;
4ec99bf0 TS	205	error("src refspec %s does not match any.",
4ec99bf0 TS	206	rs[i].src);
f88395ac JH	207	break;
	208	default:
	209	errs = 1;
	210	error("src refspec %s matches more than one.",
	211	rs[i].src);
	212	break;
	213	}
	214	switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) {
	215	case 1:
	216	break;
	217	case 0:
	218	if (!memcmp(rs[i].dst, "refs/", 5)) {
	219	int len = strlen(rs[i].dst) + 1;
	220	matched_dst = xcalloc(1, sizeof(*dst) + len);
	221	memcpy(matched_dst->name, rs[i].dst, len);
	222	link_dst_tail(matched_dst, dst_tail);
	223	}
	224	else if (!strcmp(rs[i].src, rs[i].dst) &&
	225	matched_src) {
	226	/* pushing "master:master" when
	227	* remote does not have master yet.
	228	*/
4fa1604f	229	int len = strlen(matched_src->name) + 1;
f88395ac JH	230	matched_dst = xcalloc(1, sizeof(*dst) + len);
	231	memcpy(matched_dst->name, matched_src->name,
	232	len);
	233	link_dst_tail(matched_dst, dst_tail);
	234	}
	235	else {
	236	errs = 1;
	237	error("dst refspec %s does not match any "
	238	"existing ref on the remote and does "
	239	"not start with refs/.", rs[i].dst);
	240	}
	241	break;
	242	default:
	243	errs = 1;
	244	error("dst refspec %s matches more than one.",
	245	rs[i].dst);
	246	break;
	247	}
	248	if (errs)
	249	continue;
f88395ac JH	250	if (matched_dst->peer_ref) {
	251	errs = 1;
	252	error("dst ref %s receives from more than one src.",
	253	matched_dst->name);
	254	}
ff27adf3	255	else {
f88395ac	256	matched_dst->peer_ref = matched_src;
ff27adf3 JH	257	matched_dst->force = rs[i].force;
ff27adf3 JH	258	}
f88395ac JH	259	}
	260	return -errs;
	261	}
	262
	263	static struct ref find_ref_by_name(struct ref list, const char *name)
	264	{
	265	for ( ; list; list = list->next)
	266	if (!strcmp(list->name, name))
	267	return list;
	268	return NULL;
	269	}
	270
	271	int match_refs(struct ref src, struct ref dst, struct ref ***dst_tail,
	272	int nr_refspec, char **refspec, int all)
	273	{
	274	struct refspec *rs = parse_ref_spec(nr_refspec, refspec);
	275
	276	if (nr_refspec)
	277	return match_explicit_refs(src, dst, dst_tail, rs);
	278
	279	/* pick the remainder */
	280	for ( ; src; src = src->next) {
	281	struct ref *dst_peer;
	282	if (src->peer_ref)
	283	continue;
	284	dst_peer = find_ref_by_name(dst, src->name);
635d37af	285	if ((dst_peer && dst_peer->peer_ref) \|\| (!dst_peer && !all))
f88395ac JH	286	continue;
f88395ac JH	287	if (!dst_peer) {
f88395ac JH	288	/* Create a new one and link it */
	289	int len = strlen(src->name) + 1;
	290	dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
	291	memcpy(dst_peer->name, src->name, len);
	292	memcpy(dst_peer->new_sha1, src->new_sha1, 20);
	293	link_dst_tail(dst_peer, dst_tail);
	294	}
	295	dst_peer->peer_ref = src;
	296	}
	297	return 0;
	298	}
	299
2386d658 LT	300	enum protocol {
	301	PROTO_LOCAL = 1,
	302	PROTO_SSH,
	303	PROTO_GIT,
	304	};
	305
	306	static enum protocol get_protocol(const char *name)
	307	{
	308	if (!strcmp(name, "ssh"))
	309	return PROTO_SSH;
	310	if (!strcmp(name, "git"))
	311	return PROTO_GIT;
c05186cc LT	312	if (!strcmp(name, "git+ssh"))
	313	return PROTO_SSH;
	314	if (!strcmp(name, "ssh+git"))
	315	return PROTO_SSH;
2386d658 LT	316	die("I don't handle protocol '%s'", name);
	317	}
	318
5ba88448 YH	319	#define STR_(s) # s
5ba88448 YH	320	#define STR(s) STR_(s)
2386d658	321
49744d63	322	#ifndef NO_IPV6
4c505f71	323
2386d658 LT	324	static int git_tcp_connect(int fd[2], const char prog, char host, char *path)
2386d658 LT	325	{
5ba88448 YH	326	int sockfd = -1;
	327	char colon, end;
	328	char *port = STR(DEFAULT_GIT_PORT);
	329	struct addrinfo hints, ai0, ai;
	330	int gai;
	331
	332	if (host[0] == '[') {
	333	end = strchr(host + 1, ']');
	334	if (end) {
	335	*end = 0;
	336	end++;
	337	host++;
	338	} else
	339	end = host;
	340	} else
	341	end = host;
	342	colon = strchr(end, ':');
	343
ce6f8e7e LT	344	if (colon) {
ce6f8e7e LT	345	*colon = 0;
5ba88448	346	port = colon + 1;
ce6f8e7e	347	}
5ba88448 YH	348
	349	memset(&hints, 0, sizeof(hints));
	350	hints.ai_socktype = SOCK_STREAM;
	351	hints.ai_protocol = IPPROTO_TCP;
	352
	353	gai = getaddrinfo(host, port, &hints, &ai);
	354	if (gai)
	355	die("Unable to look up %s (%s)", host, gai_strerror(gai));
	356
	357	for (ai0 = ai; ai; ai = ai->ai_next) {
	358	sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
	359	if (sockfd < 0)
	360	continue;
	361	if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
	362	close(sockfd);
	363	sockfd = -1;
	364	continue;
2386d658	365	}
5ba88448	366	break;
2386d658 LT	367	}
2386d658 LT	368
5ba88448	369	freeaddrinfo(ai0);
2386d658	370
2386d658	371	if (sockfd < 0)
5ba88448 YH	372	die("unable to connect a socket (%s)", strerror(errno));
5ba88448 YH	373
2386d658 LT	374	fd[0] = sockfd;
	375	fd[1] = sockfd;
	376	packet_write(sockfd, "%s %s\n", prog, path);
	377	return 0;
	378	}
	379
49744d63	380	#else /* NO_IPV6 */
4c505f71 PA	381
	382	static int git_tcp_connect(int fd[2], const char prog, char host, char *path)
	383	{
	384	int sockfd = -1;
	385	char colon, end;
	386	char port = STR(DEFAULT_GIT_PORT), ep;
	387	struct hostent *he;
	388	struct sockaddr_in sa;
	389	char **ap;
	390	unsigned int nport;
	391
	392	if (host[0] == '[') {
	393	end = strchr(host + 1, ']');
	394	if (end) {
	395	*end = 0;
	396	end++;
	397	host++;
	398	} else
	399	end = host;
	400	} else
	401	end = host;
	402	colon = strchr(end, ':');
	403
	404	if (colon) {
	405	*colon = 0;
	406	port = colon + 1;
	407	}
	408
	409
	410	he = gethostbyname(host);
	411	if (!he)
	412	die("Unable to look up %s (%s)", host, hstrerror(h_errno));
	413	nport = strtoul(port, &ep, 10);
	414	if ( ep == port \|\| *ep ) {
	415	/* Not numeric */
	416	struct servent *se = getservbyname(port,"tcp");
	417	if ( !se )
	418	die("Unknown port %s\n", port);
	419	nport = se->s_port;
	420	}
	421
	422	for (ap = he->h_addr_list; *ap; ap++) {
	423	sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
	424	if (sockfd < 0)
	425	continue;
	426
	427	memset(&sa, 0, sizeof sa);
	428	sa.sin_family = he->h_addrtype;
6573faff	429	sa.sin_port = htons(nport);
c6164218	430	memcpy(&sa.sin_addr, *ap, he->h_length);
4c505f71 PA	431
	432	if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
	433	close(sockfd);
	434	sockfd = -1;
	435	continue;
	436	}
	437	break;
	438	}
	439
	440	if (sockfd < 0)
	441	die("unable to connect a socket (%s)", strerror(errno));
	442
	443	fd[0] = sockfd;
	444	fd[1] = sockfd;
	445	packet_write(sockfd, "%s %s\n", prog, path);
	446	return 0;
	447	}
	448
49744d63	449	#endif /* NO_IPV6 */
4c505f71	450
f8014776	451	static char *git_proxy_command = NULL;
e814bc4d JH	452	static const char *rhost_name = NULL;
e814bc4d JH	453	static int rhost_len;
f8014776 PC	454
	455	static int git_proxy_command_options(const char var, const char value)
	456	{
e814bc4d	457	if (!strcmp(var, "core.gitproxy")) {
c3df8568 YH	458	const char *for_pos;
	459	int matchlen = -1;
	460	int hostlen;
	461
e814bc4d	462	if (git_proxy_command)
f8014776	463	return 0;
e814bc4d JH	464	/* [core]
	465	* ;# matches www.kernel.org as well
	466	* gitproxy = netcatter-1 for kernel.org
	467	* gitproxy = netcatter-2 for sample.xz
	468	* gitproxy = netcatter-default
	469	*/
c3df8568	470	for_pos = strstr(value, " for ");
e814bc4d JH	471	if (!for_pos)
	472	/* matches everybody */
	473	matchlen = strlen(value);
	474	else {
	475	hostlen = strlen(for_pos + 5);
	476	if (rhost_len < hostlen)
	477	matchlen = -1;
	478	else if (!strncmp(for_pos + 5,
	479	rhost_name + rhost_len - hostlen,
	480	hostlen) &&
	481	((rhost_len == hostlen) \|\|
	482	rhost_name[rhost_len - hostlen -1] == '.'))
	483	matchlen = for_pos - value;
	484	else
	485	matchlen = -1;
	486	}
	487	if (0 <= matchlen) {
	488	/* core.gitproxy = none for kernel.org */
	489	if (matchlen == 4 &&
	490	!memcmp(value, "none", 4))
	491	matchlen = 0;
	492	git_proxy_command = xmalloc(matchlen + 1);
	493	memcpy(git_proxy_command, value, matchlen);
	494	git_proxy_command[matchlen] = 0;
f8014776	495	}
e814bc4d	496	return 0;
f8014776 PC	497	}
	498
	499	return git_default_config(var, value);
	500	}
	501
e814bc4d	502	static int git_use_proxy(const char *host)
f8014776	503	{
e814bc4d JH	504	rhost_name = host;
e814bc4d JH	505	rhost_len = strlen(host);
f8014776 PC	506	git_proxy_command = getenv("GIT_PROXY_COMMAND");
f8014776 PC	507	git_config(git_proxy_command_options);
e814bc4d JH	508	rhost_name = NULL;
e814bc4d JH	509	return (git_proxy_command && *git_proxy_command);
f8014776 PC	510	}
	511
	512	static int git_proxy_connect(int fd[2], const char prog, char host, char *path)
	513	{
	514	char *port = STR(DEFAULT_GIT_PORT);
	515	char colon, end;
	516	int pipefd[2][2];
	517	pid_t pid;
	518
	519	if (host[0] == '[') {
	520	end = strchr(host + 1, ']');
	521	if (end) {
	522	*end = 0;
	523	end++;
	524	host++;
	525	} else
	526	end = host;
	527	} else
	528	end = host;
	529	colon = strchr(end, ':');
	530
	531	if (colon) {
	532	*colon = 0;
	533	port = colon + 1;
	534	}
	535
	536	if (pipe(pipefd[0]) < 0 \|\| pipe(pipefd[1]) < 0)
	537	die("unable to create pipe pair for communication");
	538	pid = fork();
	539	if (!pid) {
	540	dup2(pipefd[1][0], 0);
	541	dup2(pipefd[0][1], 1);
	542	close(pipefd[0][0]);
	543	close(pipefd[0][1]);
	544	close(pipefd[1][0]);
	545	close(pipefd[1][1]);
	546	execlp(git_proxy_command, git_proxy_command, host, port, NULL);
	547	die("exec failed");
	548	}
	549	fd[0] = pipefd[0][0];
	550	fd[1] = pipefd[1][1];
	551	close(pipefd[0][1]);
	552	close(pipefd[1][0]);
	553	packet_write(fd[1], "%s %s\n", prog, path);
	554	return pid;
	555	}
	556
f7192598 LT	557	/*
	558	* Yeah, yeah, fixme. Need to pass in the heads etc.
	559	*/
	560	int git_connect(int fd[2], char url, const char prog)
	561	{
	562	char command[1024];
faea9ccb	563	char host, path = url;
356bece0 YH	564	char *end;
356bece0 YH	565	int c;
f7192598 LT	566	int pipefd[2][2];
f7192598 LT	567	pid_t pid;
faea9ccb AE	568	enum protocol protocol = PROTO_LOCAL;
	569
	570	host = strstr(url, "://");
	571	if(host) {
	572	*host = '\0';
	573	protocol = get_protocol(url);
	574	host += 3;
356bece0 YH	575	c = '/';
356bece0 YH	576	} else {
f7192598	577	host = url;
356bece0 YH	578	c = ':';
	579	}
	580
	581	if (host[0] == '[') {
	582	end = strchr(host + 1, ']');
	583	if (end) {
	584	*end = 0;
	585	end++;
	586	host++;
	587	} else
	588	end = host;
	589	} else
	590	end = host;
	591
	592	path = strchr(end, c);
	593	if (c == ':') {
	594	if (path) {
faea9ccb	595	protocol = PROTO_SSH;
356bece0 YH	596	*path++ = '\0';
	597	} else
	598	path = host;
f7192598	599	}
2386d658	600
faea9ccb AE	601	if (!path \|\| !*path)
	602	die("No path specified. See 'man git-pull' for valid url syntax");
	603
	604	/*
	605	* null-terminate hostname and point path to ~ for URL's like this:
	606	* ssh://host.xz/~user/repo
	607	*/
	608	if (protocol != PROTO_LOCAL && host != url) {
	609	char *ptr = path;
	610	if (path[1] == '~')
	611	path++;
	612	else
	613	path = strdup(ptr);
	614
	615	*ptr = '\0';
	616	}
	617
f8014776	618	if (protocol == PROTO_GIT) {
e814bc4d	619	if (git_use_proxy(host))
f8014776	620	return git_proxy_connect(fd, prog, host, path);
2386d658	621	return git_tcp_connect(fd, prog, host, path);
f8014776	622	}
2386d658	623
f7192598 LT	624	if (pipe(pipefd[0]) < 0 \|\| pipe(pipefd[1]) < 0)
	625	die("unable to create pipe pair for communication");
	626	pid = fork();
	627	if (!pid) {
b10d0ec7 JH	628	snprintf(command, sizeof(command), "%s %s", prog,
b10d0ec7 JH	629	sq_quote(path));
f7192598 LT	630	dup2(pipefd[1][0], 0);
	631	dup2(pipefd[0][1], 1);
	632	close(pipefd[0][0]);
	633	close(pipefd[0][1]);
	634	close(pipefd[1][0]);
	635	close(pipefd[1][1]);
4852f723	636	if (protocol == PROTO_SSH) {
c7c81b3a JR	637	const char ssh, ssh_basename;
	638	ssh = getenv("GIT_SSH");
	639	if (!ssh) ssh = "ssh";
	640	ssh_basename = strrchr(ssh, '/');
4852f723 MS	641	if (!ssh_basename)
	642	ssh_basename = ssh;
	643	else
	644	ssh_basename++;
	645	execlp(ssh, ssh_basename, host, command, NULL);
	646	}
016fb48b MD	647	else {
	648	unsetenv(ALTERNATE_DB_ENVIRONMENT);
	649	unsetenv(DB_ENVIRONMENT);
	650	unsetenv(GIT_DIR_ENVIRONMENT);
	651	unsetenv(GRAFT_ENVIRONMENT);
	652	unsetenv(INDEX_ENVIRONMENT);
f7192598	653	execlp("sh", "sh", "-c", command, NULL);
016fb48b	654	}
f7192598	655	die("exec failed");
016fb48b	656	}
f7192598 LT	657	fd[0] = pipefd[0][0];
	658	fd[1] = pipefd[1][1];
	659	close(pipefd[0][1]);
	660	close(pipefd[1][0]);
	661	return pid;
	662	}
	663
	664	int finish_connect(pid_t pid)
	665	{
	666	int ret;
	667
	668	for (;;) {
	669	ret = waitpid(pid, NULL, 0);
	670	if (!ret)
	671	break;
	672	if (errno != EINTR)
	673	break;
	674	}
	675	return ret;
	676	}