#!/bin/sh
set -e

if [ -n "${new_host_name}" ]; then
    fullname="${new_host_name}"
    if [ -n "${new_domain_name}" ]; then
        fullname="${fullname}.${new_domain_name}"
    fi
    cat << EOName > /etc/hostname
${fullname}
EOName
    unset fullname
    hostname -F /etc/hostname
fi