[libvirt] "file '/dev/urandom' is not a supported random source"

[Daniel P. Berrange]

On Tue, Mar 22, 2016 at 02:49:42PM +0000, Richard W.M. Jones wrote:
> 
> I got this error when trying to use /dev/urandom as a backend for
> virtio-rng.  Is there a reason for that?  Plain qemu allows you to
> specify /dev/urandom and seems to work OK.
> 
> There's a tetchy bugzilla on this subject:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=1074464
> 
> but I think for cases where people don't care / throwaway appliances,
> we should allow /dev/urandom.  The main reason is that it doesn't
> block.

Having it block is desirable, even for throwaway appliances like
libguestfs, as even if the appliance is throway, the work they
do should not be assumed to be throwaway. For example if libguestfs
is creating or modifying a LUKS volume in a disk image, the guestfs
appliance is throwaway, but the resulting LUKS volume with cryptographic
keys lives for ever

Regards,
Daniel
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