#!/bin/bash
#
#  V1.0 13.03.2013 HSte Script for installing a prebuilt linux on sdcard
#


MMC_DEV=/dev/mmcblk0 #change if mmc-card mounts on different dev like /dev/sdb


HOSTNAME_GK802=GK802

IMAGE_NAME=oneiric_vpu_jas

###############################################################################

#Check if run as root
if [ $(id -u) != 0 ]; then
   echo "This script requires root permissions"
   sudo "$0" "$@"
   exit
fi

read -r -p "Are you sure your card is $MMC_DEV ? [Y/n] " response
case $response in
    [yY][eE][sS]|[yY])
echo "OK. Starting up"
p=""
if [ `echo $MMC_DEV|grep mmc` ]; then p="p"; fi
ROOTFS=$MMC_DEV$p"1"
umount $ROOTFS >/dev/null 2>&1

if [ ! -f u-boot.imx ];
        then
	echo "Downloading rootfs. This can take some time"
        wget http://stende.no-ip.info/files/u-boot.imx
	echo "Finished downloading"
fi
if [ ! -d $IMAGE_NAME ];
then
        # This is a ubuntuimage with user linaro and password linaro and sudo
        # You should also generate new ssh keys :)
	echo "Unpack rootfs. This can take some time"
        wget -c  http://stende.no-ip.info/files/oneiric_vpu_jas.tar.lzma
        tar -x --lzma -f oneiric_vpu_jas.tar.lzma
	echo "Finished unpacking"
fi

### This will format and prepare your mmc card with partition for rootfs
echo "Formatting sdcard"
dd if=/dev/zero of=$MMC_DEV bs=512 count=2047  >/dev/null 2>&1

dd if=u-boot.imx of=$MMC_DEV bs=1K seek=1 >/dev/null 2>&1 && sync && sync

# Format one partition on the sdcard
(echo n;echo;echo;echo "31248";echo;echo w) |fdisk $MMC_DEV  >/dev/null 2>&1

#  Make a ext4 optimized filesystem on sdcard
mkfs.ext4 -O ^has_journal -E stride=2,stripe-width=1024 -b 4096 -LROOTFS $ROOTFS

mkdir /media/ROOTFS  >/dev/null 2>&1

umount $ROOTFS  >/dev/null 2>&1
mount $ROOTFS /media/ROOTFS  >/dev/null 2>&1
cd $IMAGE_NAME

echo "Copy rootfs to sdcard. This can take some time"

cp -va * /media/ROOTFS

echo $HOSTNAME_GK802 > /media/ROOTFS/etc/hostname

umount $ROOTFS  >/dev/null 2>&1

echo "Finished"
echo

echo "Your sdcard should now be ready to put in to your device"
;;

    *)
        echo "Change the variable MMC_DEV to the right device"
;;
esac