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Editing: initsid.py

# Copyright 2016, Tresys Technology, LLC
#
# SPDX-License-Identifier: LGPL-2.1-only
#
from typing import NamedTuple

from ..policyrep import Context

from .context import ContextWrapper
from .descriptors import DiffResultDescriptor
from .difference import Difference, SymbolWrapper

class ModifiedInitialSID(NamedTuple):

"""Difference details for a modified initial SID."""

added_context: Context
    removed_context: Context

class InitialSIDsDifference(Difference):

"""Determine the difference in initsids between two policies."""

added_initialsids = DiffResultDescriptor("diff_initialsids")
    removed_initialsids = DiffResultDescriptor("diff_initialsids")
    modified_initialsids = DiffResultDescriptor("diff_initialsids")

def diff_initialsids(self) -> None:
        """Generate the difference in initial SIDs between the policies."""

self.log.info("Generating initial SID differences from {0.left_policy} to {0.right_policy}".
                      format(self))

self.added_initialsids, self.removed_initialsids, matched_initialsids = self._set_diff(
            (SymbolWrapper(i) for i in self.left_policy.initialsids()),
            (SymbolWrapper(i) for i in self.right_policy.initialsids()))

self.modified_initialsids = dict()

for left_initialsid, right_initialsid in matched_initialsids:
            # Criteria for modified initialsids
            # 1. change to context
            if ContextWrapper(left_initialsid.context) != ContextWrapper(right_initialsid.context):
                self.modified_initialsids[left_initialsid] = ModifiedInitialSID(
                    right_initialsid.context, left_initialsid.context)

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

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