#!/usr/bin/env bash

# Copyright 2024 Gentoo Authors
# This script is installed by sys-kernel/linux-firmware, 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 make-amd-ucode-img is not installed
if ! command -v make-amd-ucode-img >/dev/null; then
	[[ ${KERNEL_INSTALL_VERBOSE} == 1 ]] && echo \
		"make-amd-ucode-img command not available"
	exit 1
fi

[[ ${KERNEL_INSTALL_VERBOSE} == 1 ]] && echo \
	"Generating AMD CPU Microcode early initramfs image..."

make-amd-ucode-img \
	${KERNEL_INSTALL_STAGING_AREA}/microcode-amd \
	/lib/firmware/amd-ucode ||
		{ echo "make-amd-ucode-img failed" && exit 1; }