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File Content: `bool.py`

# Copyright 2016, Tresys Technology, LLC
# Copyright 2018, Chris PeBenito <pebenito@ieee.org>
#
# SPDX-License-Identifier: LGPL-2.1-only
#
from collections import defaultdict
from typing import NamedTuple

from ..policyrep import SELinuxPolicy, Boolean

from .descriptors import DiffResultDescriptor
from .difference import Difference, SymbolWrapper
from .typing import SymbolCache


_bool_cache: SymbolCache[Boolean] = defaultdict(dict)


class ModifiedBoolean(NamedTuple):

    """Difference details for a modified Boolean."""

    added_state: bool
    removed_state: bool


def boolean_wrapper(policy: SELinuxPolicy, boolean: Boolean) -> SymbolWrapper[Boolean]:
    """
    Wrap booleans from the specified policy.

    This caches results to prevent duplicate wrapper
    objects in memory.
    """
    try:
        return _bool_cache[policy][boolean]
    except KeyError:
        b = SymbolWrapper(boolean)
        _bool_cache[policy][boolean] = b
        return b


class BooleansDifference(Difference):

    """Determine the difference in type attributes between two policies."""

    added_booleans = DiffResultDescriptor("diff_booleans")
    removed_booleans = DiffResultDescriptor("diff_booleans")
    modified_booleans = DiffResultDescriptor("diff_booleans")

    def diff_booleans(self) -> None:
        """Generate the difference in type attributes between the policies."""

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

        self.added_booleans, self.removed_booleans, matched_booleans = \
            self._set_diff(
                (SymbolWrapper(b) for b in self.left_policy.bools()),
                (SymbolWrapper(b) for b in self.right_policy.bools()))

        self.modified_booleans = dict()

        for left_boolean, right_boolean in matched_booleans:
            # Criteria for modified booleans
            # 1. change to default state
            if left_boolean.state != right_boolean.state:
                self.modified_booleans[left_boolean] = ModifiedBoolean(right_boolean.state,
                                                                       left_boolean.state)

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

Name	Size	Permission
__pycache__	---	0755
__init__.py	2585 bytes	0644
bool.py	2486 bytes	0644
bounds.py	3782 bytes	0644
commons.py	2199 bytes	0644
conditional.py	1256 bytes	0644
constraints.py	8396 bytes	0644
context.py	1394 bytes	0644
default.py	3624 bytes	0644
descriptors.py	1063 bytes	0644
difference.py	5488 bytes	0644
fsuse.py	2550 bytes	0644
genfscon.py	2719 bytes	0644
ibendportcon.py	2641 bytes	0644
ibpkeycon.py	2654 bytes	0644
initsid.py	2001 bytes	0644
mls.py	10147 bytes	0644
mlsrules.py	4656 bytes	0644
netifcon.py	3127 bytes	0644
nodecon.py	2653 bytes	0644
objclass.py	3156 bytes	0644
polcap.py	1121 bytes	0644
portcon.py	2632 bytes	0644
properties.py	1820 bytes	0644
rbacrules.py	6554 bytes	0644
roles.py	2726 bytes	0644
terules.py	24669 bytes	0644
typeattr.py	2863 bytes	0644
types.py	4271 bytes	0644
typing.py	458 bytes	0644
users.py	5481 bytes	0644

File Content: bool.py

File Content: `bool.py`