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# Copyright 2016, Tresys Technology, LLC
#
# This file is part of SETools.
#
# SETools is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation, either version 2.1 of
# the License, or (at your option) any later version.
#
# SETools is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with SETools. If not, see
# <http://www.gnu.org/licenses/>.
#
from collections import namedtuple
from .descriptors import DiffResultDescriptor
from .difference import Difference
modified_properties_record = namedtuple("modified_property", ["property", "added", "removed"])
class PropertiesDifference(Difference):
"""
Determine the difference in policy properties
(unknown permissions, MLS, etc.) between two policies.
"""
modified_properties = DiffResultDescriptor("diff_properties")
def diff_properties(self):
self.modified_properties = []
if self.left_policy.handle_unknown != self.right_policy.handle_unknown:
self.modified_properties.append(
modified_properties_record("handle_unknown",
self.right_policy.handle_unknown,
self.left_policy.handle_unknown))
if self.left_policy.mls != self.right_policy.mls:
self.modified_properties.append(
modified_properties_record("MLS",
self.right_policy.mls,
self.left_policy.mls))
if self.left_policy.version != self.right_policy.version:
self.modified_properties.append(
modified_properties_record("version",
self.right_policy.version,
self.left_policy.version))
#
# Internal functions
#
def _reset_diff(self):
"""Reset diff results on policy changes."""
self.log.debug("Resetting property differences")
self.modified_properties = None