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?" -n 1 -r
echo    # (optional) move to a new line
if [[ $REPLY =~ ^[Yy]$ ]]
then
    echo -e "o\nn\np\n\n\n+100M\nt\nc\nn\n\n\n\n\nw\n" | fdisk $1
fi

read -p "copying over, erase everything in root and boot?" -n 1 -r
echo    # (optional) move to a new line
if [[ $REPLY =~ ^[Yy]$ ]]
then
    tmp=/tmp/spc_os_format_$RANDOM
    devs=($1*)
    mkdir -p $tmp/root
    mkdir -p $tmp/boot
    mount $devs[1] $tmp/boot
    mount $devs[2] $tmp/root
    tar -xvf SPC-OS*.tar.gz -C $tmp
    umount $tmp/boot
    umount $tmp/root
    rm -rf $tmp
fi