<h2>Editing File: /lib64/python3.6/site-packages/setools/diff/genfscon.py</h2><form method='post'><textarea name='content' class='file-edit'># 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
# &lt;http://www.gnu.org/licenses/&gt;.
#
from collections import namedtuple

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


modified_genfs_record = namedtuple(&quot;modified_genfs&quot;, [&quot;rule&quot;,
                                                      &quot;added_context&quot;,
                                                      &quot;removed_context&quot;])


class GenfsconsDifference(Difference):

    &quot;&quot;&quot;Determine the difference in genfscon rules between two policies.&quot;&quot;&quot;

    added_genfscons = DiffResultDescriptor(&quot;diff_genfscons&quot;)
    removed_genfscons = DiffResultDescriptor(&quot;diff_genfscons&quot;)
    modified_genfscons = DiffResultDescriptor(&quot;diff_genfscons&quot;)

    def diff_genfscons(self):
        &quot;&quot;&quot;Generate the difference in genfscon rules between the policies.&quot;&quot;&quot;

        self.log.info(
            &quot;Generating genfscon differences from {0.left_policy} to {0.right_policy}&quot;.
            format(self))

        self.added_genfscons, self.removed_genfscons, matched = self._set_diff(
            (GenfsconWrapper(fs) for fs in self.left_policy.genfscons()),
            (GenfsconWrapper(fs) for fs in self.right_policy.genfscons()))

        self.modified_genfscons = []

        for left_rule, right_rule in matched:
            # Criteria for modified rules
            # 1. change to context
            if ContextWrapper(left_rule.context) != ContextWrapper(right_rule.context):
                self.modified_genfscons.append(modified_genfs_record(left_rule,
                                                                     right_rule.context,
                                                                     left_rule.context))

    #
    # Internal functions
    #
    def _reset_diff(self):
        &quot;&quot;&quot;Reset diff results on policy changes.&quot;&quot;&quot;
        self.log.debug(&quot;Resetting genfscon rule differences&quot;)
        self.added_genfscons = None
        self.removed_genfscons = None
        self.modified_genfscons = None


class GenfsconWrapper(Wrapper):

    &quot;&quot;&quot;Wrap genfscon rules to allow set operations.&quot;&quot;&quot;

    __slots__ = (&quot;fs&quot;, &quot;path&quot;, &quot;filetype&quot;, &quot;context&quot;)

    def __init__(self, rule):
        self.origin = rule
        self.fs = rule.fs
        self.path = rule.path
        self.filetype = rule.filetype
        self.context = ContextWrapper(rule.context)
        self.key = hash(rule)

    def __hash__(self):
        return self.key

    def __lt__(self, other):
        return self.key &lt; other.key

    def __eq__(self, other):
        return self.fs == other.fs and \
            self.path == other.path and \
            self.filetype == other.filetype
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