post_install() {
  if ! getent group td-agent >/dev/null; then
    groupadd --system td-agent
  fi
  if ! getent passwd td-agent >/dev/null; then
    useradd --system -g td-agent --no-create-home -d /opt/td-agent td-agent
  fi

  mkdir -p /var/log/td-agent
  chown td-agent:td-agent /var/log/td-agent

  true
}