# Copyright 2016 Google Inc. All Rights Reserved.
#
# Licensed 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.

"""Ensure the machine supports disk encryption if required."""

from glazier.lib.policies.base import BasePolicy
from glazier.lib.policies.base import ImagingPolicyException


class DiskEncryption(BasePolicy):

  def Verify(self):
    level = self._build_info.EncryptionLevel()
    if level == 'tpm' and not self._build_info.TpmPresent():
      raise ImagingPolicyException(
          'This machine requires a TPM for encryption but no TPM was found.')