You may be interested that libguestfs 1.21.30 has support for
remote URIs from guestfish etc.
guestfish -a ssh://remote/path/to/disk.img
In upstream git also Unix domain sockets are supported:
guestfish -a nbd://?socket=/tmp/sock
More here:
https://rwmj.wordpress.com/2013/04/16/use-guestfish-virt-tools-with-remot...
Rich.
--
Richard Jones, Virtualization Group, Red Hat
http://people.redhat.com/~rjones
virt-p2v converts physical machines to virtual machines. Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v