defconfig

#!/bin/sh
# ------------------------------------------------------------------------------
# defconfig - Manages the ev3dev_defconfig file in the kernel tree.
# ------------------------------------------------------------------------------

. ./setup-env
kernel_src_path="$AM1808_KERNEL"
obj_path="$AM1808_OBJ"
make_args="$AM1808_MAKE_ARGS -C ${kernel_src_path} KBUILD_OUTPUT=${obj_path} \
ARCH=arm CROSS_COMPILE=$AM1808_COMPILER/$AM1808_ABI"

show_usage ()
{
	echo "Usage: ./defconfig load | merge | update [-i]"
	echo
	echo "COMMANDS"
	echo "--------"
	echo "load     Replaces the current kernel configuration with the configuration"
	echo "         specified ev3dev_defconfig. WARNING: You will lose any changes"
	echo "         that you made to the local kernel configuration."
	echo
	echo "merge    Calls a merge tool to merges the contents of ev3dev_defconfig"
	echo "         into the current kernel configuration"
	echo
	echo "update   Replaces arch/arm/configs/ev3dev_defconfig with the current"
	echo "         kernel configuration"
	echo
	echo "OPTIONS"
	echo "-------"
	echo "-i       When used with the update command, a merge tool will be called"
	echo "         to merge the current kernel configuration with ev3dev_defconfig"
	echo
	echo "REMARKS"
	echo "-------"
	echo "ev3dev_defconfig is located at arch/arm/configs/ev3dev_defconfig in the"
	echo "kernel tree. The current configuration is located at ../obj/.config"
	echo "unless you have overridden the object directory in ./local-env."
	echo
	echo "The merge tool is specified by the EV3DEV_MERGE_CMD environment variable."
	echo "You can override this in ./local-env."
}

check_for_local_config()
{
	if [ ! -f ${obj_path}/.config ]
	then
		echo "There is no local kernel configuration at ${obj_path}/.config"
		exit 1
	fi
}

if [ $# -gt 1 ]
then
	if [ "$1" != "update" -o "$2" != "-i" ]
	then
		show_usage
		exit 1
	fi
fi

case "$1" in

	load)
		if [ -f ${obj_path}/.config ]
		then
			echo "This will overwrite your existing kernel configuration!"
			echo "Are you sure you want to do this? (y/[n])"
			read yes_no
			if [[ $yes_no != "y" ]]
			then
				echo "Canceling..."
				exit 1
			fi
		fi
		rm -f ${obj_path}/.config
		make ${make_args} defconfig KBUILD_DEFCONFIG=ev3dev_defconfig
		exit $?
	;;
	merge)
		check_for_local_config
		mv ${obj_path}/.config ${obj_path}/.config.old
		make ${make_args} defconfig KBUILD_DEFCONFIG=ev3dev_defconfig
		mv ${obj_path}/.config ${obj_path}/.config.new
		mv ${obj_path}/.config.old ${obj_path}/.config
		export file1=${obj_path}/.config.new
		export file2=${obj_path}/.config
		eval ${EV3DEV_MERGE_CMD}
		rm -f ${obj_path}/.config.new
	;;
	update)
		check_for_local_config
		make ${make_args} savedefconfig || exit $?
		if [ "$2" == "-i" ]
		then
			export file1=${obj_path}/defconfig
			export file2=${kernel_src_path}/arch/arm/configs/ev3dev_defconfig
			eval ${EV3DEV_MERGE_CMD}
			rm -f $file1
		else
			mv ${obj_path}/defconfig ${kernel_src_path}/arch/arm/configs/ev3dev_defconfig
		fi
		exit $?
	;;
	*)
		show_usage
		exit 1
	;;
esac