pre_install() {
  getent group naemon &> /dev/null || groupadd -r naemon -g 44
  getent passwd naemon &> /dev/null || useradd -r -u 44 -g naemon \
    -d /var/lib/naemon -s /sbin/nologin -c "Naemon" naemon
}

pre_upgrade() {
  pre_install
}

pre_remove() {
  if [[ -f /run/naemon/naemon.pid ]]; then
    systemctl stop naemon
  fi
}