pre_upgrade() {
  if [ -e etc/opt/ripple/rippled.cfg ]; then
    mkdir -p etc/rippled && cp -u etc/opt/ripple/rippled.cfg "$_"
  fi
  if [ -e etc/opt/ripple/validators.txt ]; then
    mkdir -p etc/rippled && cp -u etc/opt/ripple/validators.txt "$_"
  fi
}