#!/bin/bash

set -e

cleanup() {
    [ -d "$EXTMNT" ] && umount $EXTMNT && rmdir $EXTMNT
    [ -d "$SQUASHMNT" ] && umount $SQUASHMNT && rmdir $SQUASHMNT
    [ -d "$ISOMNT" ] && umount $ISOMNT && rmdir $ISOMNT
}

exitclean() {
    echo "Cleaning up to exit..."
    cleanup
    exit 1
}

trap exitclean SIGINT SIGTERM

PATH=/sbin:/usr/sbin:$PATH

ISO=$(readlink -f "$1")
ROOT=$(readlink -f "$2")

ISOMNT=$(mktemp -d /media/isotmp.XXXXXX)
mount -o loop,ro "$ISO" $ISOMNT || exitclean

EXTIMG=$ISOMNT/LiveOS/ext3fs.img
if [ -e $ISOMNT/LiveOS/squashfs.img ] ; then
    SQUASHMNT=$(mktemp -d /media/squashtmp.XXXXXX)
    mount -o loop,ro $ISOMNT/LiveOS/squashfs.img $SQUASHMNT || exitclean
    EXTIMG=$SQUASHMNT/LiveOS/ext3fs.img
fi

EXTMNT=$(mktemp -d /media/exttmp.XXXXXX)
mount -o loop,ro $EXTIMG $EXTMNT || exitclean

echo "Create root filesystem..."

mkdir -p $ROOT
chmod a+rx $ROOT/.

cp -a $EXTMNT/* $ROOT

echo "Done."
cleanup