[Libguestfs] failure to virt-sysprep (FC27?)

[Emmanuel Kasper]

> What's happening [in the Perl test case, not necessarily in Yaniv's
> case] is that libguestfs is opening the VMDK file for write, and at
> the same time ‘qemu-img info’ is opening the VMDK file for read.

You're right about this, so I am thinking of using list_devices() and
blockdev_getsize64() to get the disk size from the appliance.