#!/bin/sh

# This code is covered by the GNU General Public License (GPLv2 or higher)

NVRAM=$(which nvram)
FW_PRINTENV=$(which fw_printenv)

path=$(mount | grep ext[23] | sed -n '/sda2\|md0\|disk1_1/ {s/\/dev\/\(sda2\|md0\|.*disk1_1\) on \(.*\) type.*/\2/; p}'
if [ -z "$path" ]; then
	echo "You have to create an ext2 filesystem on the first physical partition"
	exit 1
fi

if [ ! -e $path/uImage.buffalo ]; then
	echo "You have to download the uImage.buffalo file from the debian-installer for Linkstation, and put it in $path"
	exit 1
fi

if [ ! -e $path/initrd.buffalo ]; then
	echo "You have to download the initrd.buffalo file from the debian-installer for Linkstation, and put it in $path"
	exit 1
fi

if [ -n "$NVRAM" ]; then
	PRINTENV="$NVRAM -c printenv"
	SETENV="$NVRAM -c set"
	GETENV="$NVRAM -c get"
elif [ -n "$FW_PRINTENV" ]; then
	if [ -z "$(which fw_setenv)" ]; then
		echo "Program fw_setenv not found, cannot modify U-Boot environment..."
		exit 1
	elif [ ! -f /etc/fw_env.config ]; then
		echo "Configuration file for fw_printenv not found."
		exit 1
	else
		PRINTENV=$FW_PRINTENV
		SETENV=$(which fw_setenv)
		GETENV="$FW_PRINTENV -n"
	fi
else
	echo "No tool found for modifying U-Boot environment..."
	exit 1
fi

BOOTVER=$($GETENV buffalo_ver | sed 's/^.*=//')
if [ -z "$BOOTVER" ]; then
	echo "Unable to detect Buffalo bootloader version.  Please ensure that your bootloader supports automatic initrd position/size detection."
	exit 1
else
	BOOTVER_MAJOR=${BOOTVER%.*}
	BOOTVER_MINOR=${BOOTVER#*.}
	if [ $BOOTVER_MAJOR -eq 1 -a $BOOTVER_MINOR -lt 10 ]; then
		echo "Incompatible bootloader version detected.  Please update to the latest firmware version."
		exit 1
	fi
fi

printf "Saving U-Boot environment to ubootenv.bak... "
$PRINTENV > ubootenv.bak || exit 1
echo "done."

echo "Changing U-Boot environment... "
$SETENV bootargs_root "root=/dev/sda2 rw panic=5"
echo "done."

echo "Please reboot your Linkstation."