fetch_source() {
	mkdir -p src
	cd src || perror "Could not change into src directory."
	download "$REQUIRED_URL"
}

build() {
	local KERNELSRCDIR="$MODULE_DIR/../kernel/ksrc"	# kernel sources
	local NVIDIA="$MODULE_DIR/src/$REQUIRED_NVIDIA"
	local NVIDIAEXTRACTDIR="$MODULE_BUILD_DIR/NVIDIA"

	pdebug "Unpacking NVidia-Installer ..."
	[ -d "$NVIDIAEXTRACTDIR" ] && rm -rf "$NVIDIAEXTRACTDIR"
	sh "$NVIDIA" --extract-only --target "$NVIDIAEXTRACTDIR" ||	perror "Could not extract $NVIDIA to $NVIDIAEXTRACTDIR."
	
	pinfo "Ready to chroot - may take some time."
	pdebug "--- chroot ---------------------------------------------------------------------"
	pdebug "-                                                                              -"
	pdebug "-   Notice: This may take a while!                                             -"
	pdebug "-                                                                              -"
	pdebug "-      Please keep note the Nvidia installer _will_ complain about             -"
	pdebug "-      several warnings and errors. It will do this in any case.               -"
	pdebug "-                                                                              -"
	pdebug "-      This does _not_ mean the library module compilation was unsuccessful!   -"
	pdebug "-                                                                              -"
	pdebug "--------------------------------------------------------------------------------"

	chroot_run "${MODULE_BUILD_DIR}" <<-EOF
	/NVIDIA/nvidia-installer --no-nouveau-check --no-network --no-backup --no-rpms --no-runlevel-check --no-distro-scripts --no-cc-version-check --no-x-check --no-precompiled-interface --silent --no-kernel-module
	EOF
	pinfo "chroot terminated, cleaning up"
	
	pdebug "Handling whiteouts ..."
	local WHITEOUT_LIST="${MODULE_BUILD_DIR}/opt/openslx/etc/nvidia.whiteout"
	rm -f -- "$WHOUTEOUT_LIST"
	mkdir -p "$(dirname "$WHITEOUT_LIST")" || perror "Could not create $(dirname "$WHITEOUT_LIST")"
	pdebug "Searching for overlayfs-whiteouts ..."
	for WHITEOUT in $(find "$MODULE_BUILD_DIR" -lname "(overlay-whiteout)"); do
		pdebug "Whiteout found: $WHITEOUT"
		echo "/./${WHITEOUT#$MODULE_BUILD_DIR}" >> "$WHITEOUT_LIST"
		rm -f -- "$WHITEOUT" || perror "Could not delete whiteout $WHITEOUT!"
	done
	
	rm -rf "$MODULE_BUILD_DIR/NVIDIA"
}

post_copy() {
	:
}