tests: Add basic test for non-global LoadParm behaviour

Add a simple test to show that the new non-global LoadParm behaviour
works, i.e.
- by default all LoadParm objects are linked to the same underlying
  object
- using a non-global LoadParm creates a separate underlying object.
- using a non-global LoadParm with a bad filename fails.

Signed-off-by: Tim Beale <timbeale@catalyst.net.nz>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

python/samba/tests/loadparm.py

@@ -0,0 +1,82 @@
+# Unix SMB/CIFS implementation.
+# Copyright (C) Andrew Bartlett <abartlet@samba.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+from samba.tests import TestCaseInTempDir
+from samba import param
+import os
+
+# the python bindings for LoadParm objects map (by default) to a single global
+# object in the underlying C code. E.g. if we create 2 different LoadParm
+# objects in python, really they're just the same object underneath.
+class LoadParmTest(TestCaseInTempDir):
+
+    def test_global_loadparm(self):
+        # create 2 different Loadparm objects (which are really the same
+        # object underneath)
+        lp1 = param.LoadParm()
+        lp2 = param.LoadParm()
+
+        # we can prove this by setting a value on lp1 and assert that the
+        # change is also reflected on lp2
+        lp1_realm = "JUST.A.TEST"
+        self.assertNotEqual(lp2.get('realm'), lp1_realm)
+        lp1.set('realm', lp1_realm)
+        self.assertEqual(lp1.get('realm'), lp1_realm)
+        self.assertEqual(lp2.get('realm'), lp1_realm)
+
+    def touch_temp_file(self, filename):
+        filepath = os.path.join(self.tempdir, filename)
+        open(filepath, 'a').close()
+        # delete the file once the test completes
+        self.addCleanup(os.remove, filepath)
+        return filepath
+
+    def test_non_global_loadparm(self):
+        # create a empty smb.conf file
+        smb_conf = self.touch_temp_file("smb.conf")
+
+        # we can create a non-global Loadparm that overrides the default
+        # behaviour and creates a separate underlying object
+        lp1 = param.LoadParm()
+        lp2 = param.LoadParm(filename_for_non_global_lp=smb_conf)
+
+        # setting a value for the global LP does not affect the non-global LP
+        lp1_realm = "JUST.A.TEST"
+        self.assertNotEqual(lp2.get('realm'), lp1_realm)
+        lp1.set('realm', lp1_realm)
+        self.assertEqual(lp1.get('realm'), lp1_realm)
+        self.assertNotEqual(lp2.get('realm'), lp1_realm)
+
+        # and vice versa
+        lp2_realm = "TEST.REALM.LP2"
+        lp2.set('realm', lp2_realm)
+        self.assertEqual(lp2.get('realm'), lp2_realm)
+        self.assertEqual(lp1.get('realm'), lp1_realm)
+
+    def test_non_global_loadparm_bad_path(self):
+        non_existent_file = os.path.join(self.tempdir, 'not-there')
+
+        # we can create a non-global Loadparm that overrides the default
+        # behaviour and creates a separate underlying object
+        self.assertRaises(ValueError,
+                          param.LoadParm,
+                          filename_for_non_global_lp=non_existent_file)
+
+        # still shouldn't be there
+        self.assertRaises(ValueError,
+                          param.LoadParm,
+                          non_existent_file)

source4/selftest/tests.py

@@ -771,6 +771,8 @@ planoldpythontestsuite("ad_dc_ntvfs",
 planoldpythontestsuite("ad_dc_ntvfs",
                        "samba.tests.blackbox.traffic_summary",
                        extra_args=['-U"$USERNAME%$PASSWORD"'])
+planoldpythontestsuite("none", "samba.tests.loadparm")
+
 #
 # Want a selection of environments across the process models
 #