#!/bin/sh
# Veto filesystems unsuitable for certain crypto setups

dev=$1
id=$2
filesystems="$3"

veto_filesystems ()
{
	[ -f $dev/crypt_realdev ] || return 1

	# Get to the underlying crypto device directory
	r=$(cat $dev/crypt_realdev)
	cryptodev=${r##*:}

	[ -f $cryptodev/method ] || return 1
	method=$(cat $cryptodev/method)

	if [ $method = crypto ]; then
		[ -f $cryptodev/keytype ] || return 1
		keytype=$(cat $cryptodev/keytype)

		if [ $keytype = random ]; then
			# Veto anything but ext2
			for fs in $filesystems; do
				case $fs in
				    ext2) echo $fs ;;
				esac
			done
			return 0
		fi
	fi

	return 1
}

veto_filesystems || echo $filesystems

exit 0