Created attachment 131884 [details] xenguest-install-abspath.patch
When doing: $> xenguest-install.py -f foo.img things seem to work fine (e.g. the image gets created if it doesn't exit) except the device isn't actually exported to the guest. Problem turns out to be that Xen needs an absolute path. Attached is a simple patch to make any relative paths absolute.
Committed the fix and building it