#!/bin/bash

determine_config_file() {
	if [ "${CMD_KERNEL_CONFIG}" != "" ]
	then
		KERNEL_CONFIG="${CMD_KERNEL_CONFIG}"
	elif [ -f "/etc/kernels/kernel-config-${ARCH}-${KV}" ]
	then
		KERNEL_CONFIG="/etc/kernels/kernel-config-${ARCH}-${KV}"
	elif [ -f "${GK_SHARE}/${ARCH}/kernel-config-${KV}" ]
	then
		KERNEL_CONFIG="${GK_SHARE}/${ARCH}/kernel-config-${KV}"
	elif [ "${DEFAULT_KERNEL_CONFIG}" != "" -a -f "${DEFAULT_KERNEL_CONFIG}" ]
	then
		KERNEL_CONFIG="${DEFAULT_KERNEL_CONFIG}"
	elif [ -f "${GK_SHARE}/${ARCH}/kernel-config-${VER}.${PAT}" ]
	then
		KERNEL_CONFIG="${GK_SHARE}/${ARCH}/kernel-config-${VER}.${PAT}"
	elif [ -f "${GK_SHARE}/${ARCH}/kernel-config" ]
	then
		KERNEL_CONFIG="${GK_SHARE}/${ARCH}/kernel-config"
	else
		gen_die 'Error: No kernel .config specified, or file not found!'
	fi
}

config_kernel() {
	determine_config_file
	cd "${KERNEL_DIR}" || gen_die 'Could not switch to the kernel directory!'

	isTrue "${CLEAN}" && cp "${KERNEL_DIR}/.config" "${KERNEL_DIR}/.config.bak" > /dev/null 2>&1
	if isTrue ${MRPROPER}
	then
		print_info 1 'kernel: >> Running mrproper...'
		compile_generic mrproper kernel
	fi

	# If we're not cleaning, then we don't want to try to overwrite the configs
	# or we might remove configurations someone is trying to test.

	if isTrue "${CLEAN}"
	then
		print_info 1 "config: Using config from ${KERNEL_CONFIG}"
		print_info 1 '        Previous config backed up to .config.bak'
		cp "${KERNEL_CONFIG}" "${KERNEL_DIR}/.config" || gen_die 'Could not copy configuration file!'
	fi
	if isTrue "${OLDCONFIG}"
	then
		print_info 1 '        >> Running oldconfig...'
		yes '' 2>/dev/null | compile_generic oldconfig kernel 2>/dev/null
	fi
	if isTrue "${CLEAN}"
	then
		print_info 1 'kernel: >> Cleaning...'
		compile_generic clean kernel
	else
		print_info 1 "config: --no-clean is enabled; leaving the .config alone."
	fi
	
	if isTrue ${MENUCONFIG}
	then
		print_info 1 'config: >> Invoking menuconfig...'
		compile_generic menuconfig runtask
		[ "$?" ] || gen_die 'Error: menuconfig failed!'
	elif isTrue ${CMD_GCONFIG}
	then
		if [ "${VER}" == '2' ] && [ "${PAT}" -lt '6' ]
		then
			print_warning 1 'config: gconfig is not available in 2.4 series kernels. Running xconfig'
			print_warning 1 '        instead...'

			CMD_GCONFIG=0
			CMD_XCONFIG=1
		else
			print_info 1 'config: >> Invoking gconfig...'
			compile_generic gconfig kernel
			[ "$?" ] || gen_die 'Error: gconfig failed!'

			CMD_XCONFIG=0
		fi
	fi

	if isTrue ${CMD_XCONFIG}
	then
		print_info 1 'config: >> Invoking xconfig...'
		compile_generic xconfig kernel
		[ "$?" ] || gen_die 'Error: xconfig failed!'
	fi

	# Force this on if we are a 2.4 kernel or less
	# This is required for initrd support
	# Initramfs doesn't require this
	# TODO: force on with --genzimage
	if [ "${KERN_24}" -eq '1' ]
	then
		# Make sure Ext2 support is on...
		sed -e 's/#\? \?CONFIG_EXT2_FS[ =].*/CONFIG_EXT2_FS=y/g' \
			-i ${KERNEL_DIR}/.config 
	fi

	# Make sure lvm modules are on if --lvm/--lvm
	if isTrue ${CMD_LVM}
	then
		sed -i ${KERNEL_DIR}/.config -e 's/#\? \?CONFIG_BLK_DEV_DM is.*/CONFIG_BLK_DEV_DM=m/g'
		sed -i ${KERNEL_DIR}/.config -e 's/#\? \?CONFIG_DM_SNAPSHOT is.*/CONFIG_DM_SNAPSHOT=m/g'
		sed -i ${KERNEL_DIR}/.config -e 's/#\? \?CONFIG_DM_MIRROR is.*/CONFIG_DM_MIRROR=m/g'
	fi

	# Make sure dmraid modules are on if --dmraid
	if isTrue ${CMD_DMRAID}
	then
		sed -i ${KERNEL_DIR}/.config -e 's/#\? \?CONFIG_BLK_DEV_DM is.*/CONFIG_BLK_DEV_DM=m/g'
	fi

	if isTrue ${SPLASH}
	then
		sed -i ${KERNEL_DIR}/.config -e 's/#\? \?CONFIG_FB_SPLASH is.*/CONFIG_FB_SPLASH=y/g'
	fi
}