DSM-G600, DNS-3xx and NSA-220 Hack Forum

#!/bin/bash
###########
# This is a bash version of Windows Vista's "ReadyBoost".  This doesn't have a
# limitation on the hardware, or a minimum size requirement either.  I wrote
# this kind of as a proof of concept that, yes, we could do this too.
# Someone remind me again why in the *hell* anyone would want to pay for Vista?
###########

if [[ $EUID -ne "0" ]]
then
    echo
    echo "#############################################"
    echo "# You must be root / sudo to run SwapBoost! #"
    echo "#############################################"
    echo
exit 1
fi

device=$(mount | tail -n1 | awk '{ print $1 }')
mount=$(mount | tail -n1 | awk '{ print $3; }')
freespace=$(df | tail -n1 | awk '{ print $4; }')

function usage {
    echo "usage: $0 [OPTION] [DEVICE]"
    echo "Create (or destroy) additional swap space on removable USB media"
    echo
    echo "-n, --new            create a new swap file a USB device"
    echo
    echo "-d, --delete            delete a USB swap file"
    echo
    echo "-h, --help            display this help information"
    echo
    echo "Example:"
    echo " $0 -n"
    echo "    The above will create a swap file on the latest USB"
    echo " $0 -d"
    echo "    The above will delete a swap file on the latest USB"
    echo
    echo "Originally created by Christer Edwards <christer.edwards@ubuntu.com>"
    echo "Released into the public domain"
    echo
}

function destroy {
if [[ -f $mount/swap ]]
then
    swapoff $mount/swap
    sleep 5
    rm $mount/swap
    sleep 5
    umount $mount
    echo
    echo "swap file cleaned up. ($freespace) available for use."

    else

    echo
    echo "You don't seem to have a swap file created on that device"
    exit 1
fi
}

function create {
if [[ -f $mount/swap ]]
then
    echo
    echo "You already have swap created on that device."
    echo
    swapon $mount/swap
    exit 1
fi

read -p "Would you like to create additional swap space on $device? ($mount) (y/n) " CREATE
CREATE=$(echo $CREATE | tr 'A-Z' 'a-z')
if [[ $CREATE == 'y' ]] || [[ $CREATE == 'yes' ]]
then

read -p "Would you like to use the maximum available space? ($freespace) (y/n)" SPACE
    if [[ $SPACE == 'y' ]] || [[ $SPACE == 'yes' ]]
    then
    
    dd if=/dev/zero of=$mount/swap bs=1K count=$freespace
    sleep 5
    mkswap $mount/swap
    sleep 5
    swapon $mount/swap
    sleep 5

    echo
    echo "You now have $freespace additional space available as swap"

    else

    echo
    echo "Planned for upcoming release.  Currently only full size accepted"

    fi
    exit 1

else
    echo
    echo "Exiting SwapBoost"
    exit 1
fi
}

while getopts ":ndh" OPTS ; do
    case $OPTS in
        n)    create     ;;
        d)    destroy    ;;
        \? | h)    usage    ;;
    esac
done