post_install() {
  getent group flume &>/dev/null || groupadd -r flume >/dev/null
  getent passwd flume &>/dev/null || useradd -r -g flume -d /etc/flume flume >/dev/null
  chown -R flume:flume /etc/flume-ng
  true
}

post_upgrade() {
  post_install
}

post_remove() {
  getent passwd flume &>/dev/null && userdel flume >/dev/null
  getent group flume &>/dev/null && groupdel flume >/dev/null
  true
}