post_install() {
  getent passwd turnserver >/dev/null || useradd -rd / -s /sbin/nologin turnserver
  systemd-tmpfiles --create turnserver.conf
  post_upgrade
  echo 'Settings are at /etc/turnserver.conf'
}

post_upgrade() {
  chown turnserver:turnserver /var/log/turnserver
}

pre_remove() {
  userdel turnserver
}