Implement __deepcopy__() for aare

Thanks to http://bugs.python.org/issue10076, we need to implement this
ourself :-/

Also add some tests to ensure __deepcopy__() works as expected.

I found this bug while testing the dbus patch series, which crashed
aa-cleanprof with
    TypeError: cannot deepcopy this pattern object


Acked-by: John Johansen <john.johansen@canonical.com>

utils/apparmor/aare.py

@@ -46,6 +46,13 @@ class AARE(object):
         '''returns a "printable" representation of AARE'''
         return "AARE('%s')" % self.regex
 
+    def __deepcopy__(self, memo):
+        # thanks to http://bugs.python.org/issue10076, we need to implement this ourself
+        if self.orig_regex:
+            return AARE(self.orig_regex, is_path=False, log_event=True)
+        else:
+            return AARE(self.regex, is_path=False)
+
     def match(self, expression):
         '''check if the given expression (string or AARE) matches the regex'''
 

utils/test/test-aare.py

@@ -13,6 +13,7 @@
 import unittest
 from common_test import AATest, setup_all_loops
 
+from copy import deepcopy
 import re
 from apparmor.common import convert_regexp, AppArmorBug, AppArmorException
 from apparmor.aare import AARE, convert_expression_to_aare
@@ -223,6 +224,25 @@ class TestAARERepr(AATest):
         obj = AARE('/foo', True)
         self.assertEqual(str(obj), "AARE('/foo')")
 
+class TestAAREDeepcopy(AATest):
+    tests = [
+        # regex         is path?    log event     expected (dummy value)
+        (AARE('/foo',   False)                  , True),
+        (AARE('/foo',   False,      True)       , True),
+        (AARE('/foo',   True)                   , True),
+        (AARE('/foo',   True,       True)       , True),
+    ]
+
+    def _run_test(self, params, expected):
+        dup = deepcopy(params)
+
+        self.assertTrue(params.match('/foo'))
+        self.assertTrue(dup.match('/foo'))
+
+        self.assertEqual(params.regex, dup.regex)
+        self.assertEqual(params.orig_regex, dup.orig_regex)
+        self.assertEqual(params.orig_regex, dup.orig_regex)
+
 
 setup_all_loops(__name__)
 if __name__ == '__main__':