#!/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 '/sda1/ {s/\/dev\/sda1 on \(.*\) type.*/\1/; p}')

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 bootcmd "ide reset; ext2load ide 0:1 0x00100000 /\$(kernel);ext2load ide 0:1 0x00800000 /\$(initrd);setenv bootargs \$(bootargs_base) \$(bootargs_root) \$(buffalo_ver);bootm 0x00100000 0x00800000"
echo "done."

echo "Abgeschlossen"