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      1 # Copyright 2016, Tresys Technology, LLC
      2 #
      3 # This file is part of SETools.
      4 #
      5 # SETools is free software: you can redistribute it and/or modify
      6 # it under the terms of the GNU Lesser General Public License as
      7 # published by the Free Software Foundation, either version 2.1 of
      8 # the License, or (at your option) any later version.
      9 #
     10 # SETools is distributed in the hope that it will be useful,
     11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
     12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     13 # GNU Lesser General Public License for more details.
     14 #
     15 # You should have received a copy of the GNU Lesser General Public
     16 # License along with SETools.  If not, see
     17 # <http://www.gnu.org/licenses/>.
     18 #
     19 from .descriptors import DiffResultDescriptor
     20 from .difference import Difference, SymbolWrapper
     21 
     22 
     23 class PolCapsDifference(Difference):
     24 
     25     """Determine the difference in polcaps between two policies."""
     26 
     27     added_polcaps = DiffResultDescriptor("diff_polcaps")
     28     removed_polcaps = DiffResultDescriptor("diff_polcaps")
     29 
     30     def diff_polcaps(self):
     31         """Generate the difference in polcaps between the policies."""
     32 
     33         self.log.info("Generating policy cap differences from {0.left_policy} to {0.right_policy}".
     34                       format(self))
     35 
     36         self.added_polcaps, self.removed_polcaps, _ = self._set_diff(
     37             (SymbolWrapper(n) for n in self.left_policy.polcaps()),
     38             (SymbolWrapper(n) for n in self.right_policy.polcaps()))
     39 
     40     #
     41     # Internal functions
     42     #
     43     def _reset_diff(self):
     44         """Reset diff results on policy changes."""
     45         self.log.debug("Resetting policy capability differences")
     46         self.added_polcaps = None
     47         self.removed_polcaps = None
     48