post_install() {
  if ! getent group upmpdcli >/dev/null; then
     groupadd --system upmpdcli >/dev/null
  fi
  if ! getent passwd upmpdcli >/dev/null; then
     useradd -g upmpdcli --system upmpdcli -s /bin/false -d / >/dev/null
  fi
  if [[ ! "$(stat -c '%U:%G' /etc/upmpdcli.conf)" == "upmpdcli:upmpdcli" ]]; then
     chown upmpdcli:upmpdcli /etc/upmpdcli.conf
  fi
}

post_upgrade() {
  post_install $1
  echo "WARNING! Name of the systemd-service changed from upmpcli.service to upmpdcli.service."
}