#!bash
perl_clean_env() {
	local warned value;

	for i in PERL_MM_OPT PERL5LIB PERL5OPT PERL_MB_OPT PERL_CORE PERLPREFIX; do
    # Next unless match
		[ -v $i ] || continue;

    # Warn only once, and warn only when one of the bad values are set.
    # record failure here.
		if [ ${warned:-0} == 0 ]; then 
      if [ ${I_KNOW_WHAT_IM_DOING:-0} == 1 ]; then
        echo "Potentially bad ENV values found but I_KNOW_WHAT_IM_DOING=1";
      else
        echo "Bad ENV values found. Please unset from ENV ( ~/.bashrc, package.env, etc ) or set I_KNOW_WHAT_IM_DOING=1"
      fi
			warned=1
		fi

		# Read ENV Value
		eval "value=\$$i";
		echo "    $i=\"$value\"";
	done

  # If any failures occurred, die unless I_KNOW_WHAT_IM_DOING
  if [ ${warned:-0} == 1 ] && [ ${I_KNOW_WHAT_IM_DOING:-0} != 1 ]; then
    die;
  fi
}

perl_clean_env;