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

post_upgrade() {
  post_install
}

pre_remove() {
  userdel turnserver
}