CONFFILE=/etc/qemu/qemu-ga.conf
if [ "$(which qemu-ga)" == "" ]; then
   echo "guest agent is not installed"
else
   if [ ! -f $CONFFILE ]; then
      qemu-ga -D > $CONFFILE
      sed -i "s/block-rpcs=/block-rpcs=guest-set-user-password/" $CONFFILE
      systemctl restart qemu-guest-agent
   else
      if [ "$(grep guest-set-user-password $CONFFILE)" == "" ]; then
         echo "block-rpcs=guest-set-user-password" >> $CONFFILE
         systemctl restart qemu-guest-agent
      fi
   fi
fi