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  #
  #    Copyright 2010 OpenStack LLC
  #
  #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  from nova import flags
  from nova import test
  from nova.virt import libvirt_conn
  
  FLAGS = flags.FLAGS
  
  
  class LibvirtConnTestCase(test.TrialTestCase):
      def test_get_uri_and_template(self):
          class MockDataModel(object):
              def __init__(self):
                  self.datamodel = { 'name' : 'i-cafebabe',
                                     'memory_kb' : '1024000',
                                     'basepath' : '/some/path',
                                     'bridge_name' : 'br100',
                                     'mac_address' : '02:12:34:46:56:67',
                                     'vcpus' : 2 }
  
          type_uri_map = { 'qemu' : ('qemu:///system',
                                  [lambda s: '<domain type=\'qemu\'>' in s,
                                   lambda s: 'type>hvm</type' in s,
                                   lambda s: 'emulator>/usr/bin/kvm' not in s]),
                           'kvm' : ('qemu:///system',
                                  [lambda s: '<domain type=\'kvm\'>' in s,
                                   lambda s: 'type>hvm</type' in s,
                                   lambda s: 'emulator>/usr/bin/qemu<' not in s]),
                           'uml' : ('uml:///system',
                                  [lambda s: '<domain type=\'uml\'>' in s,
                                   lambda s: 'type>uml</type' in s]),
                            }
  
          for (libvirt_type,(expected_uri, checks)) in type_uri_map.iteritems():
              FLAGS.libvirt_type = libvirt_type
              conn = libvirt_conn.LibvirtConnection(True)
  
              uri, template = conn.get_uri_and_template()
              self.assertEquals(uri, expected_uri)
  
              for i, check in enumerate(checks):
                  xml = conn.toXml(MockDataModel())
                  self.assertTrue(check(xml), '%s failed check %d' % (xml, i))
  
          # Deliberately not just assigning this string to FLAGS.libvirt_uri and
          # checking against that later on. This way we make sure the
          # implementation doesn't fiddle around with the FLAGS.
          testuri = 'something completely different'
          FLAGS.libvirt_uri = testuri
          for (libvirt_type,(expected_uri, checks)) in type_uri_map.iteritems():
              FLAGS.libvirt_type = libvirt_type
              conn = libvirt_conn.LibvirtConnection(True)
              uri, template = conn.get_uri_and_template()
              self.assertEquals(uri, testuri)
  
  
subject: Add new libvirt_type option "uml" for user-mode-linux.. This switches the libvirt URI to uml:///system and uses a different template for the libvirt xml.