instance: added clone method to InstanceTemplate

circle/vm/models/instance.py

@@ -157,6 +157,36 @@ class InstanceTemplate(AclBase, VirtualMachineDescModel, TimeStampedModel):
         if is_new:
             self.set_level(self.owner, 'owner')
 
+    def clone(self, user=None, **kwargs):
+        """Cloning a Template to a new Template.
+
+        It returns the new Template object.
+        Disk cloning handled paralell and asynchronusly.
+        """
+        import copy
+        tmpl = copy.deepcopy(self)
+        tmpl.name = "Cloned from " + self.name
+        tmpl.pk = None
+        tmpl.full_clean()  # Avoiding database errors.
+        tmpl.save()
+
+        def __clone_disk(disk):
+            cloned_disk = Disk.create(datastore=disk.datastore,
+                                      name=disk.name, size=disk.size,
+                                      type=disk.type)
+            #Paralell cloning disks
+            disk.clone_async(cloned_disk, user=user)
+            return cloned_disk
+        try:
+            tmpl.disks.add(*[__clone_disk(disk)
+                           for disk in self.disks.all()])
+            tmpl.interface_set.add(*self.interface_set.all())
+        except:
+            tmpl.delete()
+            raise
+        else:
+            return tmpl
+
     @permalink
     def get_absolute_url(self):
         return ('dashboard.views.template-detail', None, {'pk': self.pk})