mobile-nixos/bin/kernel-normalize-config

#!/usr/bin/env bash

# This script is expected to be used to copy back the `kernel-builder` built
# linux configuration to the kernel's source directory.
#
# Use this to normalize the configuration after:
#
#  - Changing configuration options
#  - Changing the kernel version

set -e
set -u
PS4=" $ "

if (( $# != 2 )); then
	echo "Usage: bin/kernel-normalize-config <device-name> <output>"
	exit 1
fi

device="$1"; shift
out="$1"; shift

set -x

build() {
	nix-build --no-out-link -A config.mobile.device.info.kernel --argstr device "$device"
}

# The first one actively rebuilds to get the config...
cp "$(build)/build.config" "$out"
# This one rebuilds with the (assumedly) normalized config
cp "$(build)/build.config" "$out"
# This last copy and build is likely useless. Though it's a quick no-op
cp "$(build)/build.config" "$out"