[autotest] add more logging when we change DNS

client/bin/site_ui_test.py

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import dbus, logging, os, shutil, socket, sys, time
 from autotest_lib.client.bin import chromeos_constants
 from autotest_lib.client.bin import site_login, site_utils, test as bin_test
 from autotest_lib.client.common_lib import error, site_ui
 from autotest_lib.client.common_lib import site_auth_server, site_dns_server
 from dbus.mainloop.glib import DBusGMainLoop
@@ skipping 58 matching lines @@
     def use_local_dns(self, dns_port=53):
         """Set all devices to use our in-process mock DNS server.
         """
         self._dnsServer = site_dns_server.LocalDns(local_port=dns_port)
         self._dnsServer.run()
         self._bus_loop = DBusGMainLoop(set_as_default=True)
         self._system_bus = dbus.SystemBus(mainloop=self._bus_loop)
         self._flim = flimflam.FlimFlam(self._system_bus)
         for device in self._flim.GetObjectList('Device'):
             properties = device.GetProperties()
+            logging.debug("Considering " + properties['Type'])
             for path in properties['IPConfigs']:
                 ipconfig = self._flim.GetObjectInterface('IPConfig', path)
 
                 servers = ipconfig.GetProperties().get('NameServers', None)
                 if servers != None:
                     self._dns[path] = ','.join(servers)
+                    logging.debug("Cached DNS for "  + properties['Type'])
                 ipconfig.SetProperty('NameServers', '127.0.0.1')
+                logging.debug("Changed DNS for "  + properties['Type'])
 
         site_utils.poll_for_condition(
             lambda: self.__attempt_resolve('www.google.com', '127.0.0.1'),
             site_login.TimeoutError('Timed out waiting for DNS changes.'),
             10)
         site_login.refresh_login_screen()
 
 
     def revert_dns(self):
         """Clear the custom DNS setting for all devices and force them to use
@@ skipping 155 matching lines @@
             self.logout()
 
         self.stop_authserver()
 
 
     def get_auth_endpoint_misses(self):
         if hasattr(self, '_authServer'):
             return self._authServer.get_endpoint_misses()
         else:
             return {}