post_install() {
	getent group "nbd" &>/dev/null || groupadd -r -g 44 nbd 1>/dev/null
	getent passwd "nbd" &>/dev/null || useradd -r -u 44 -g nbd -d "/var/empty" -s "/bin/false" nbd 1>/dev/null
}

post_upgrade() {
	post_install
}

pre_remove() {
	getent passwd "nbd" &>/dev/null && userdel nbd 1>/dev/null
	getent group "nbd" &>/dev/null && groupdel nbd 1>/dev/null
}