Comment 4 for bug 1616938

I wonder if an alternative in nova's glance v2 image service when creating the image is to check the CONF.snapshot_image_format (which is currently only a libvirt option), and if not set then default to qcow2. That seems pretty hacky though.

I don't really understand how xenapi works with glance though given the xen plugins code for uploading vhds here:

https://github.com/openstack/nova/blob/master/plugins/xenserver/xenapi/etc/xapi.d/plugins/glance.py#L612