Merge branch 'migrate-fixes' into 'master'

migrate fixes

🆗 tests
🆗 #156
🆗 #155

circle/vm/operations.py

@@ -202,6 +202,10 @@ class MigrateOperation(InstanceOperation):
     name = _("migrate")
     description = _("Live migrate running VM to another node.")
 
+    def rollback(self, activity):
+        with activity.sub_activity('rollback_net'):
+            self.instance.deploy_net()
+
     def _operation(self, activity, to_node=None, timeout=120):
         if not to_node:
             with activity.sub_activity('scheduling') as sa:
@@ -212,8 +216,13 @@ class MigrateOperation(InstanceOperation):
         with activity.sub_activity('shutdown_net'):
             self.instance.shutdown_net()
 
+        try:
             with activity.sub_activity('migrate_vm'):
                 self.instance.migrate_vm(to_node=to_node, timeout=timeout)
+        except Exception as e:
+            if hasattr(e, 'libvirtError'):
+                self.rollback(activity)
+            raise
 
         # Refresh node information
         self.instance.node = to_node

circle/vm/tests/test_models.py

@@ -129,6 +129,25 @@ class InstanceTestCase(TestCase):
             migr.apply_async.assert_called()
             self.assertNotIn(call.sub_activity(u'scheduling'), act.mock_calls)
 
+    def test_migrate_with_error(self):
+        inst = Mock(destroyed_at=None, spec=Instance)
+        inst.interface_set.all.return_value = []
+        inst.node = MagicMock(spec=Node)
+        e = Exception('abc')
+        setattr(e, 'libvirtError', '')
+        inst.migrate_vm.side_effect = e
+        migrate_op = MigrateOperation(inst)
+        with patch('vm.models.instance.vm_tasks.migrate') as migr:
+            act = MagicMock()
+            with patch.object(MigrateOperation, 'create_activity',
+                              return_value=act):
+                self.assertRaises(Exception, migrate_op, system=True)
+
+            migr.apply_async.assert_called()
+            self.assertIn(call.sub_activity(u'scheduling'), act.mock_calls)
+            self.assertIn(call.sub_activity(u'rollback_net'), act.mock_calls)
+            inst.select_node.assert_called()
+
     def test_status_icon(self):
         inst = MagicMock(spec=Instance)
         inst.status = 'dummy-value'