format_disk.sh

#!/bin/bash
if [ $# -lt 1 ]
then
    echo "USAGE: $0 <block device>"
    exit 1
fi
read -p "About to format $1, Are you sure (y/N)?" -n 1 -r
echo   
if [[ $REPLY =~ ^[Yy]$ ]]
then
    echo -e "o\nn\np\n\n\n+100M\nt\nc\nn\n\n\n\n\nw\n" | fdisk $1
    devs=($1*)
    echo "using $devs[1] for /boot AND $devs[2] for /root"
    mkfs.vfat $devs[1]
    mkfs.ext4 $devs[2]
fi

read -p "Mounting and untarring. Continue (y/N)?" -n 1 -r
echo    
if [[ $REPLY =~ ^[Yy]$ ]]
then
    tmp=/tmp/spc_os_format_$RANDOM
    echo "Mounting ..."
    mkdir -p $tmp/root
    mkdir -p $tmp/boot
    mount $devs[1] $tmp/boot
    mount $devs[2] $tmp/root
    echo "Untarring: "
    tar -xvf SPC-OS*.tar.gz -C $tmp --totals
    echo "Syncing fs"
    sync
    umount $tmp/boot
    umount $tmp/root
    rm -rf $tmp
fi