#! /bin/bash
#
# This testing kernel is same configuration as the standard 2.6.31.6
# with the exception that it has taskstats enabled.
set -e
set -u

KVer='2.6.31.6'

function Md5Compare ()
{
	if [[ $(cat $2 | cut -d' ' -f1) \
			!= $(md5sum $1 | cut -d' ' -f1) ]]; then
		echo "Bad md5 detected on $1"
		exit 1
	fi
}

function Download()
{
	echo "Downloading files"
	local f=''
	for f in Modules.tar.gz Modules.tar.gz.md5 uImage uImage.md5; do
		if [[ ! -f sheeva-$KVer-$f ]]; then
			if [[ -z "$(which wget)" ]]; then
				echo "Use apt-get to install wget, then rerun this script"
				exit 1
			fi
			wget -c http://sheeva.with-linux.com/sheeva/testing/$KVer/sheeva-$KVer-$f || \
			wget -c http://sheeva6.with-linux.com/sheeva/testing/$KVer/sheeva-$KVer-$f
			if [[ ! -f sheeva-$KVer-$f ]]; then
				echo "Unable to retrieve sheeva-$KVer-$f"
				exit 1
			fi
		fi
	done
	Md5Compare sheeva-$KVer-Modules.tar.gz sheeva-$KVer-Modules.tar.gz.md5
	Md5Compare sheeva-$KVer-uImage sheeva-$KVer-uImage.md5
}

function ExtractModules()
{
	echo "Extracting modules"
	tar x -C / --overwrite -zf sheeva-$KVer-Modules.tar.gz
}

function NandKernel()
{
	echo "Flashing kernel to NAND"
	# MTDDEVICE should be either /dev/mtd0 or /dev/mtd1
	# depending on which partition contains the kernel uImage

	local Mtd=$(grep uImage /proc/mtd | cut -d' ' -f1 | sed 's#:##')

	flash_eraseall -j /dev/$Mtd
	nandwrite -pm /dev/$Mtd sheeva-$KVer-uImage
}

function RootKernel()
{
	echo "Writing kernel to /boot"
	[[ -d /boot ]] || mkdir /boot
	cp sheeva-$KVer-uImage /boot/
	echo "****************************************************************"
	echo " update your bootcmd to load sheeva-$KVer-uImage"
	echo " or use a symlink from /boot/sheeva-$KVer-uImage to /boot/uImage"
	echo "****************************************************************"
}

function Usage()
{
	echo "Use --nandkernel to write kernel to NAND"
	echo "Or  --rootkernel to write kernel to /boot"
}

if [[ $# < 1 ]]; then
	Usage
	exit 1
fi

if [[ "$1" == "--nandkernel" ]]; then
	Download
	ExtractModules
	NandKernel
elif [[ "$1" == "--rootkernel" ]]; then
	Download
	ExtractModules
	RootKernel
else
	Usage
	exit 1
fi