#!/bin/sh

if [ ! -x /sbin/cryptsetup ]; then
	return 1;
fi

FSTYPE=$2
MOUNTFROM=$3
VOLUME=$4
OPTIONS=$5

# Make sure that MOUNTFROM starts with /dev/
substr="${MOUNTFROM##/dev/}"
if [ "$substr" = "$MOUNTFROM" ]; then
	MOUNTFROM="/dev/$MOUNTFROM"
fi

# Check if the volume is really a luks volume
/sbin/cryptsetup isLuks $MOUNTFROM
if [ "$?" -ne "0" ]; then
	return 1;
fi

# Open crypto volume
/sbin/cryptsetup $OPTIONS luksOpen $MOUNTFROM $VOLUME
if [ "$?" -ne "0" ]; then
	return 2;
fi

# Mount, as is expected, onto /new_root
mount -o ro -t $FSTYPE /dev/mapper/$VOLUME /new_root
if [ "$?" -ne "0" ]; then
	return 3;
fi