post_install() {
  systemd-sysusers cassandra.conf
  systemd-tmpfiles --create cassandra.conf

  ln -snf /var/lib/cassandra /usr/share/cassandra/data
  ln -snf /var/log/cassandra /usr/share/cassandra/logs
}

post_upgrade() {
  post_install
}

pre_remove() {
  systemctl stop cassandra
}

post_remove() {
  if getent passwd cassandra >/dev/null 2>&1; then
    userdel cassandra
  fi
  if getent group cassandra >/dev/null 2>&1; then
    groupdel cassandra
  fi
}