# -*- coding: utf-8 -*-
#
# Author: Alberto Planas <aplanas@suse.com>
#
# Copyright 2019 SUSE LINUX GmbH, Nuernberg, Germany.
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

import glob
import os.path


def __secure_boot():
    '''Detect if secure-boot is enabled.'''
    enabled = False
    sboot = glob.glob('/sys/firmware/efi/vars/SecureBoot-*/data')
    if len(sboot) == 1:
        enabled = open(sboot[0], 'rb').read()[-1:] == b'\x01'
    return enabled


def uefi():
    '''Populate UEFI grains.'''
    grains = {
        'efi': os.path.exists('/sys/firmware/efi/systab'),
        'efi-secure-boot': __secure_boot(),
    }

    return grains
