Also of note in this conversation:
https://github.com/libguestfs/nbdkit/blob/master/docs/nbdkit-probing.pod
which currently doesn't mention filters, but ought to once we settle
on the definitive way to detect them.
Rich.
--
Richard Jones, Virtualization Group, Red Hat
http://people.redhat.com/~rjones
Read my programming and virtualization blog:
http://rwmj.wordpress.com
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine. Supports Linux and Windows.
http://people.redhat.com/~rjones/virt-df/