#!/usr/bin/env bash

# Copyright 2024 Gentoo Authors
# This script is installed by sys-firmware/intel-microcode, it is executed by
# systemd's kernel-install, NOT by the traditional installkernel. I.e. this
# plugin is run when the systemd USE flag is enabled or
# SYSTEMD_KERNEL_INSTALL=1 is set in the environment.

COMMAND="${1}"

if [[ ${COMMAND} != add ]]; then
	exit 0
fi

if [[ ${KERNEL_INSTALL_INITRD_GENERATOR} == dracut ]]; then
	# Dracut bundles microcode in its initramfs images
	[[ ${KERNEL_INSTALL_VERBOSE} == 1 ]] && echo \
		"initrd_generator=${KERNEL_INSTALL_INITRD_GENERATOR} bundles CPU microcode, nothing to do here."
	exit 0
fi

# do nothing if somehow iucode_tool is not installed
if ! command -v iucode_tool >/dev/null; then
	[[ ${KERNEL_INSTALL_VERBOSE} == 1 ]] && echo \
		"iucode_tool command not available"
	exit 1
fi

# use same opts as intel-microcode.ebuild
opts=(
	--write-earlyfw="${KERNEL_INSTALL_STAGING_AREA}/microcode-intel"
	--overwrite
	--strict-checks
	--no-ignore-broken
	--no-downgrade
)

if [[ ${KERNEL_INSTALL_VERBOSE} == 1 ]]; then
	echo "Generating Intel CPU Microcode early initramfs image..."
	opts+=(
		--list-all
		--list
	)
fi

iucode_tool /lib/firmware/intel-ucode "${opts[@]}" ||
	{ echo "iucode_tool failed" && exit 1; }