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#!/usr/bin/bash
CERTS=/etc/secureboot
DB_KEY="${CERTS}/local/db.key"
DB_CERT="${CERTS}/local/db.crt"
function sign(){ sbsign --key "${DB_KEY}" --cert "${DB_CERT}" --output "$2" "$1"; }
if [ "$(whoami)" != "root" ]
then	if [ -n "${DISPLAY}" ]
	then exec pkexec "$0" "$@"
	else exec sudo "$0" "$@"
	fi
	exit 1
fi
if ! [ -f "${DB_KEY}" ]
then	echo "SecureBoot certificates not found,execute 'secureboot-keygen' first." >&2
	exit 1
fi
case "${1}" in
	'')
		echo "Usage: $0 <source> <signed>" >&2
		echo "       $0 --replace <file>" >&2
		echo "       $0 --systemd-boot" >&2
		exit 1
	;;
	--systemd-boot)
		if [ -n "${2}" ]
		then	echo "Too many arguments." >&2
			exit 1
		fi
		EFI=/usr/lib/systemd/boot/efi/systemd-bootx64.efi
		if ! [ -f "${EFI}" ]
		then	echo "No systemd-boot found." >&2
			exit 1
		fi
		echo "Resign systemd-boot bootloader SecureBoot support."
		cp "${EFI}"{,.bak} ||exit 1
		echo "Signing systemd-boot file..."
		sign "${EFI}"{.bak,} ||exit 1
		echo "Generate checksum..."
		md5sum "${EFI}" > "${EFI}.md5"
	;;
	--replace)
		if [ -z "$2" ]
		then	echo "Usage: $0 --replace <file>" >&2
			exit 1
		fi
		if [ -n "${3}" ]
		then	echo "Too many arguments." >&2
			exit 1
		fi
		if ! [ -f "$2" ]
		then	echo "File $2 not found." >&2
			exit 1
		fi
		mv "${2}"{,.bak}
		echo "Signing custom file..."
		if ! sign "${2}"{.bak,} || ! [ -f "${2}" ]
		then	echo "Sign ${2} failed." >&2
			mv "${2}"{.bak,}
		fi
	;;
	*)
		if [ -z "$2" ]
		then	echo "Usage: $0 <source> <signed>" >&2
			exit 1
		fi
		if [ -n "${3}" ]
		then	echo "Too many arguments." >&2
			exit 1
		fi
		if ! [ -f "${1}" ]
		then	echo "File $1 not found." >&2
			exit 1
		fi
		rm -f "${2}"
		echo "Signing custom file..."
		sign "${1}" "${2}"
	;;
esac