vm: add precondition checks

circle/vm/operations.py

@@ -157,6 +157,11 @@ class DeployOperation(InstanceOperation):
     name = _("deploy")
     description = _("Deploy new virtual machine with network.")
 
+    def check_precond(self):
+        super(DeployOperation, self).check_precond()
+        if self.instance.status in ['RUNNING', 'SUSPENDED']:
+            raise self.instance.WrongStateError(self.instance)
+
     def on_commit(self, activity):
         activity.resultant_state = 'RUNNING'
 
@@ -238,6 +243,11 @@ class MigrateOperation(InstanceOperation):
         with activity.sub_activity('rollback_net'):
             self.instance.deploy_net()
 
+    def check_precond(self):
+        super(MigrateOperation, self).check_precond()
+        if self.instance.status not in ['RUNNING']:
+            raise self.instance.WrongStateError(self.instance)
+
     def check_auth(self, user):
         if not user.is_superuser:
             raise PermissionDenied()
@@ -279,6 +289,11 @@ class RebootOperation(InstanceOperation):
     name = _("reboot")
     description = _("Reboot virtual machine with Ctrl+Alt+Del signal.")
 
+    def check_precond(self):
+        super(RebootOperation, self).check_precond()
+        if self.instance.status not in ['RUNNING']:
+            raise self.instance.WrongStateError(self.instance)
+
     def _operation(self, timeout=5):
         self.instance.reboot_vm(timeout=timeout)
 
@@ -329,6 +344,11 @@ class ResetOperation(InstanceOperation):
     name = _("reset")
     description = _("Reset virtual machine (reset button).")
 
+    def check_precond(self):
+        super(ResetOperation, self).check_precond()
+        if self.instance.status not in ['RUNNING']:
+            raise self.instance.WrongStateError(self.instance)
+
     def _operation(self, timeout=5):
         self.instance.reset_vm(timeout=timeout)
 
@@ -362,6 +382,11 @@ class SaveAsTemplateOperation(InstanceOperation):
             for disk in self.disks:
                 disk.destroy()
 
+    def check_precond(self):
+        super(SaveAsTemplateOperation, self).check_precond()
+        if self.instance.status not in ['RUNNING', 'PENDING', 'STOPPED']:
+            raise self.instance.WrongStateError(self.instance)
+
     def _operation(self, activity, user, system, timeout=300, name=None,
                    with_shutdown=True, task=None, **kwargs):
         if with_shutdown:
@@ -456,6 +481,11 @@ class ShutOffOperation(InstanceOperation):
     name = _("shut off")
     description = _("Shut off VM (plug-out).")
 
+    def check_precond(self):
+        super(ShutOffOperation, self).check_precond()
+        if self.instance.status not in ['RUNNING']:
+            raise self.instance.WrongStateError(self.instance)
+
     def on_commit(self, activity):
         activity.resultant_state = 'STOPPED'
 

circle/vm/tests/test_models.py

@@ -103,6 +103,7 @@ class InstanceTestCase(TestCase):
         inst = Mock(destroyed_at=None, spec=Instance)
         inst.interface_set.all.return_value = []
         inst.node = MagicMock(spec=Node)
+        inst.status = 'RUNNING'
         migrate_op = MigrateOperation(inst)
         with patch('vm.models.instance.vm_tasks.migrate') as migr:
             act = MagicMock()
@@ -118,6 +119,7 @@ class InstanceTestCase(TestCase):
         inst = MagicMock(destroyed_at=None, spec=Instance)
         inst.interface_set.all.return_value = []
         inst.node = MagicMock(spec=Node)
+        inst.status = 'RUNNING'
         migrate_op = MigrateOperation(inst)
         with patch('vm.models.instance.vm_tasks.migrate') as migr:
             inst.select_node.side_effect = AssertionError
@@ -133,6 +135,7 @@ class InstanceTestCase(TestCase):
         inst = Mock(destroyed_at=None, spec=Instance)
         inst.interface_set.all.return_value = []
         inst.node = MagicMock(spec=Node)
+        inst.status = 'RUNNING'
         e = Exception('abc')
         setattr(e, 'libvirtError', '')
         inst.migrate_vm.side_effect = e