defconfig

#!/bin/sh
# ------------------------------------------------------------------------------
# defconfig - Manages the ${EV3DEV_DEFCONFIG} file in the kernel tree.
# ------------------------------------------------------------------------------

. ./setup-env
kernel_src_path="$EV3DEV_KERNEL"
obj_path="$EV3DEV_OBJ"
make_args="$EV3DEV_MAKE_ARGS -C ${kernel_src_path} KBUILD_OUTPUT=${obj_path} \
ARCH=arm CROSS_COMPILE=$EV3DEV_TOOLCHAIN/$EV3DEV_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 ${EV3DEV_DEFCONFIG}"
	echo "         into the current kernel configuration"
	echo
	echo "update   Calls a merge tool to the current kernel configuration into"
        echo " arch/arm/configs/${EV3DEV_DEFCONFIG} with the current"
	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_path}/.config"
	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
	show_usage
	exit 1
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 $?
		export file1=${obj_path}/defconfig
		export file2=${kernel_src_path}/arch/arm/configs/${EV3DEV_DEFCONFIG}
		eval ${EV3DEV_MERGE_CMD}
		rm -f $file1
		exit $?
	;;
	*)
		show_usage
		exit 1
	;;
esac