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/usr/lib64/python3.9/site-packages/setools/diff/properties.py
# Copyright 2016, Tresys Technology, LLC
#
# SPDX-License-Identifier: LGPL-2.1-only
#
from typing import NamedTuple, Union

from ..policyrep import PolicyEnum

from .descriptors import DiffResultDescriptor
from .difference import Difference


class ModifiedProperty(NamedTuple):

    """Difference details for a modified policy property."""

    property: str
    added: Union[PolicyEnum, bool, int]
    removed: Union[PolicyEnum, bool, int]


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) -> None:
        self.modified_properties = []

        if self.left_policy.handle_unknown != self.right_policy.handle_unknown:
            self.modified_properties.append(
                ModifiedProperty("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(
                ModifiedProperty("MLS",
                                 self.right_policy.mls,
                                 self.left_policy.mls))

        if self.left_policy.version != self.right_policy.version:
            self.modified_properties.append(
                ModifiedProperty("version",
                                 self.right_policy.version,
                                 self.left_policy.version))

    #
    # Internal functions
    #
    def _reset_diff(self) -> None:
        """Reset diff results on policy changes."""
        self.log.debug("Resetting property differences")
        self.modified_properties = None
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