modified resize_rootfs.sh

#!/bin/sh
set -e

if [ "$(id -u)" -ne "0" ]; then
        echo "This script requires root."
        exit 1
fi

set -x

DEVICE="/dev/mmcblk0"
PART="2"

resize()
{
        start=$(fdisk -l ${DEVICE}|grep ${DEVICE}p${PART}|awk '{print $2}')
        echo $start

        set +e
        fdisk ${DEVICE} <<EOF
p
d
5
d
2
n
e
2
$start

n
l


w
EOF
        set -e

        partx -u ${DEVICE}
        resize2fs ${DEVICE}p5
}

resize

echo "Done!"