#!/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)
dir=$(dirname $1)

if [ "$ext" == "tar.bz2" ]; then
    uncompress=j
else
    uncompress=z
fi

rm -rf mnt
mkdir -p mnt

fakeroot bash -c "\
tar -x$uncompress -f $1 -C mnt; \
genext2fs -d mnt -b $(($2 * 1024)) $dir/$base.img; \
rm -rf mnt; \
"