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#include "cache.h"
#include "pkt-line.h"
static const char send_pack_usage[] = "git-send-pack [--exec=other] destination [heads]*";
static const char *exec = "git-receive-pack";
struct ref {
struct ref *next;
unsigned char old_sha1[20];
unsigned char new_sha1[20];
char name[0];
};
static struct ref *ref_list = NULL;
static int read_ref(const char *ref, unsigned char *sha1)
{
int fd, ret;
static char pathname[PATH_MAX];
char buffer[60];
const char *git_dir = gitenv(GIT_DIR_ENVIRONMENT) ? : DEFAULT_GIT_DIR_ENVIRONMENT;
snprintf(pathname, sizeof(pathname), "%s/%s", git_dir, ref);
fd = open(pathname, O_RDONLY);
if (fd < 0)
return -1;
ret = -1;
if (read(fd, buffer, sizeof(buffer)) >= 40)
ret = get_sha1_hex(buffer, sha1);
close(fd);
return ret;
}
static int send_pack(int in, int out)
{
for (;;) {
unsigned char old_sha1[20];
unsigned char new_sha1[20];
static char buffer[1000];
char *name;
struct ref *n;
int 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;
if (read_ref(name, new_sha1) < 0) {
fprintf(stderr, "no such local reference '%s'\n", name);
continue;
}
if (!has_sha1_file(old_sha1)) {
fprintf(stderr, "remote '%s' points to object I don't have\n", name);
continue;
}
if (!memcmp(old_sha1, new_sha1, 20)) {
fprintf(stderr, "'%s' unchanged\n", name);
} else {
char new_hex[60];
strcpy(new_hex, sha1_to_hex(new_sha1));
fprintf(stderr, "%s: updating from %s to %s\n", name, sha1_to_hex(old_sha1), new_hex);
}
n = xmalloc(sizeof(*n) + len - 40);
memcpy(n->old_sha1, old_sha1, 20);
memcpy(n->new_sha1, new_sha1, 20);
memcpy(n->name, buffer + 41, len - 40);
n->next = ref_list;
ref_list = n;
}
packet_flush(out);
close(out);
return 0;
}
/*
* First, make it shell-safe. We do this by just disallowing any
* special characters. Somebody who cares can do escaping and let
* through the rest. But since we're doing to feed this to ssh as
* a command line, we're going to be pretty damn anal for now.
*/
static char *shell_safe(char *url)
{
char *n = url;
unsigned char c;
static const char flags[256] = {
['0'...'9'] = 1,
['a'...'z'] = 1,
['A'...'Z'] = 1,
['.'] = 1, ['/'] = 1,
['-'] = 1, ['+'] = 1,
[':'] = 1
};
while ((c = *n++) != 0) {
if (flags[c] != 1)
die("I don't like '%c'. Sue me.", c);
}
return url;
}
/*
* Yeah, yeah, fixme. Need to pass in the heads etc.
*/
static int setup_connection(int fd[2], char *url, char **heads)
{
char command[1024];
const char *host, *path;
char *colon;
int pipefd[2][2];
url = shell_safe(url);
host = NULL;
path = url;
colon = strchr(url, ':');
if (colon) {
*colon = 0;
host = url;
path = colon+1;
}
snprintf(command, sizeof(command), "%s %s", exec, path);
if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
die("unable to create pipe pair for communication");
if (!fork()) {
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 (host)
execlp("ssh", "ssh", host, command, NULL);
else
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 0;
}
int main(int argc, char **argv)
{
int i, nr_heads = 0;
char *dest = NULL;
char **heads = NULL;
int fd[2];
argv++;
for (i = 1; i < argc; i++) {
char *arg = *argv++;
if (*arg == '-') {
if (!strncmp(arg, "--exec=", 7)) {
exec = arg + 7;
continue;
}
usage(send_pack_usage);
}
dest = arg;
heads = argv;
nr_heads = argc - i -1;
break;
}
if (!dest)
usage(send_pack_usage);
if (setup_connection(fd, dest, heads))
return 1;
return send_pack(fd[0], fd[1]);
}
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