git/connect.c
Junio C Hamano 9546010b7b fetch-pack: output refs in the order they were given on the command line.
Currently, fetched refs are output in the order the remote side
happened to send them.  This changes the order to match the
order of refs that were given on the command line.  To the
existing core callers (git-fetch and git-clone) this does not
make any difference, but for other Porcelain use, it would be
more intuitive.

Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-22 05:32:38 -07:00

687 lines
14 KiB
C

#include "git-compat-util.h"
#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 ", 4)) {
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 (i + 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;
int free_path = 0;
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);
free_path = 1;
}
*ptr = '\0';
}
if (protocol == PROTO_GIT) {
int ret;
if (git_use_proxy(host))
ret = git_proxy_connect(fd, prog, host, path);
else
ret = git_tcp_connect(fd, prog, host, path);
if (free_path)
free(path);
return ret;
}
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]);
if (free_path)
free(path);
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;
}