update_config.sh: use vars

#!/bin/bash -e

SRC=src/linux

CONFIG=config.x86_64

config_equal()

{

	diff -q -s src/linux/.config config.x86_64 &>/dev/null

	diff -q -s "$SRC/.config" "$CONFIG" &>/dev/null

}

if config_equal; then

	(cd src/linux && make menuconfig)

	(cd "$SRC" && make menuconfig)

else

	[[ -e src ]] && rm -rf src

	[[ -e "$SRC" ]] && rm -rf "$SRC"

	makepkg --nobuild --force

	(cd src/linux && make oldconfig)

	(cd "$SRC" && make oldconfig)

fi

if ! config_equal; then

	cp src/linux/.config config.x86_64

	cp -v "$SRC/.config" "$CONFIG"

	updpkgsums

fi