#!/bin/bash
# This file must be executable to work! chmod 755!
#
# This script will close LUKS filesystem if not in use
#
# Install in cron to run regularly

CRYPTSETUP=/sbin/cryptsetup

shopt -s nullglob
for dev in /dev/mapper/*_autocrypt
do
    match=`mount|grep $dev`
    if [ -z "$match" ]; then
        # fs is not mounted, LUKS fs can be closed
        dm_file=${dev##*/}
        $CRYPTSETUP luksClose $dm_file
    fi
done