post_install() {
  getent group tpe >/dev/null || groupadd -g 200 tpe
  getent group audit >/dev/null || groupadd -g 201 audit
  getent group socket-deny-all >/dev/null || groupadd -g 202 socket-deny-all
  getent group socket-deny-client >/dev/null || groupadd -g 203 socket-deny-client
  getent group socket-deny-server >/dev/null || groupadd -g 204 socket-deny-server
}