#!/bin/sh

usage() {
	echo "usage: mkuki <disk> <partition>"
}

disk="$1"
part="$2"

([ -z "${disk}" ] || [ -z "${part}" ]) && usage && exit 1

kernel="$3"

log() {
	echo "========================================================================"
	echo "$@"
	echo "========================================================================"
}

set -e

# Generates an Unified Kernel Image.

kernel="${kernel:-$(uname --kernel-release)}"
version="${kernel%%-gentoo*}"
bootnum="$(efibootmgr | grep "BootCurrent" | awk '{ print $2 }')"

log "Generating Unified Kernel Image"
dracut --kver="${kernel}" --force /efi/gentoo.efi.signed

log "Deleting previous UEFI entry (bootnum ${bootnum})"
efibootmgr \
	--delete-bootnum \
	--bootnum "${bootnum}" || echo "warn: could not delete existing boot partition!"

label="Gentoo (Linux ${version})"
log "Creating new UEFI entry '${label}'"
efibootmgr \
	--create \
	--label "${label}" \
	--disk "${disk}" \
	--part "${part}" \
	--loader "\gentoo.efi.signed"