Comment 74 for bug 1415087

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Matt Riedemann (mriedem) wrote :

Given nova.virt.libvirt.utils.create_cow_image which is calling qemu-img create with a backing file but not specifying the backing file format, I'd consider nova affected by this issue:

https://github.com/openstack/nova/blob/master/nova/virt/libvirt/utils.py#L75