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#!/usr/bin/env bash
# SPDX-License-Identifier: GPL-3.0-or-later
set -o nounset -o xtrace
TEMP_FILE=/tmp/root.hints
HINTS_FILE=etc/root.hints
# download latest root hints
wget -O ${TEMP_FILE} https://www.internic.net/domain/named.root
# strip comments for diff
sed '/^;/d' ${TEMP_FILE} > ${TEMP_FILE}.clean
sed '/^;/d' ${HINTS_FILE} > ${HINTS_FILE}.clean
# check for changes
diff ${TEMP_FILE}.clean ${HINTS_FILE}.clean >/dev/null
CHANGED=$?
if [ $CHANGED -ne 0 ]; then
# update root.hints
mv ${TEMP_FILE} ${HINTS_FILE}
fi
# cleanup
rm -f ${TEMP_FILE} ${TEMP_FILE}.clean ${HINTS_FILE}.clean
# signal change with exit code
exit $CHANGED
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