#!/bin/bash

set -e

tmpfile=$(mktemp)
if [ ! -w $tmpfile ] ; then
        echo "Failed to create tmp file" >&2
        exit 0
fi

trap "rm -rf $tmpfile" EXIT # cleanup if aborted

RULESET="include \"$tmpfile\""

echo "$RULESET" > $tmpfile

$NFT -f $tmpfile 2>/dev/null || exit 0
echo "E: endless include loop" >&2
exit 1