1 files changed, 79 insertions, 0 deletions
diff --git a/rsh.c b/rsh.c
new file mode 100644
index 000000000..016d72ead
--- /dev/null
+++ b/rsh.c
@@ -0,0 +1,79 @@
+#include "cache.h"
+#include "rsh.h"
+#include "quote.h"
+
+#define COMMAND_SIZE 4096
+
+int setup_connection(int *fd_in, int *fd_out, const char *remote_prog,
+		     char *url, int rmt_argc, char **rmt_argv)
+{
+	char *host;
+	char *path;
+	int sv[2];
+	int i;
+	pid_t pid;
+	struct strbuf cmd;
+
+	if (!strcmp(url, "-")) {
+		*fd_in = 0;
+		*fd_out = 1;
+		return 0;
+	}
+
+	host = strstr(url, "//");
+	if (host) {
+		host += 2;
+		path = strchr(host, '/');
+	} else {
+		host = url;
+		path = strchr(host, ':');
+		if (path)
+			*(path++) = '\0';
+	}
+	if (!path) {
+		return error("Bad URL: %s", url);
+	}
+
+	/* $GIT_RSH <host> "env GIT_DIR=<path> <remote_prog> <args...>" */
+	strbuf_init(&cmd, COMMAND_SIZE);
+	strbuf_addstr(&cmd, "env ");
+	strbuf_addstr(&cmd, GIT_DIR_ENVIRONMENT "=");
+	sq_quote_buf(&cmd, path);
+	strbuf_addch(&cmd, ' ');
+	sq_quote_buf(&cmd, remote_prog);
+
+	for (i = 0 ; i < rmt_argc ; i++) {
+		strbuf_addch(&cmd, ' ');
+		sq_quote_buf(&cmd, rmt_argv[i]);
+	}
+
+	strbuf_addstr(&cmd, " -");
+
+	if (cmd.len >= COMMAND_SIZE)
+		return error("Command line too long");
+
+	if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv))
+		return error("Couldn't create socket");
+
+	pid = fork();
+	if (pid < 0)
+		return error("Couldn't fork");
+	if (!pid) {
+		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++;
+		close(sv[1]);
+		dup2(sv[0], 0);
+		dup2(sv[0], 1);
+		execlp(ssh, ssh_basename, host, cmd.buf, NULL);
+	}
+	close(sv[0]);
+	*fd_in = sv[1];
+	*fd_out = sv[1];
+	return 0;
+}