#!/bin/sh

if [ $# -ne 2 ]; then
    echo "Usage: $0 <tarball> <ext2 size>"
    exit
fi

ext=`echo $1 | sed -r -e 's/.+\.([^.]+\.[^.]+)/\1/'`
base=$(basename $1 .$ext)
if [ "$ext" == "tar.bz2" ]; then
    uncompress=j
else
    uncompress=z
fi

dd if=/dev/zero of=$base.img bs=1M count=$2
mkfs.ext2 -F -m1 $base.img

mkdir -p mnt
mount -o loop $base.img mnt

tar -x$uncompress -f $1 -C mnt

umount mnt
rm -rf mnt