implement shutdown

src/daemon.rs

@@ -65,9 +65,9 @@ fn read_command(stream: &mut TcpStream) -> WResult<String> {
     Ok(command)
 }
 
+// TODO: Use DBus to send a message to systemd instead of spawning a new process
 fn build_shutdown_cmd() -> Command {
     let mut cmd = Command::new("systemctl");
-    cmd.arg("-k");
     cmd.arg("poweroff");
 
     cmd