[libvirt-users] [Libguestfs] Running virConnectGetCapabilities / virsh capabilities without a daemon or KVM

[Ram Krishna]

lstopo, lstopo --output-format xml 

These commands might be helpful

> On Mar 21, 2017, at 10:35 AM, Richard W.M. Jones <rjones at redhat.com> wrote:
> 
> 
> For virt-p2v we want to get the host CPU model, topology etc, and the
> best way we found to do that was to pull it from libvirt
> capabilities[1].  Since libvirt is already parsing the host CPU
> information, and because /proc/cpuinfo is such a stupid format to
> parse, this is very convenient.
> 
> Unfortunately it doesn't work unless libvirtd _and_ KVM are both
> installed.
> 
> Without libvirtd installed:
> 
>  # virsh capabilities
>  error: failed to connect to the hypervisor
>  error: Failed to connect socket to '/var/run/libvirt/libvirt-sock': No such file or directory
> 
> With libvirt-daemon installed, but not QEMU:
> 
>  # virsh capabilities
>  error: failed to connect to the hypervisor
>  error: no connection driver available for <null>
> 
> I feel I should be able to fiddle with the connection URI in some way
> to make this possible, at least in the second case.  However there's
> not a concept of "no hypervisor", and I couldn't find any other way to
> make it work.  Using "test:///default" seems tempting, but it
> substitutes some imaginary host (i686) so that's no good.
> 
> Installing KVM isn't really an option for us since we are trying to
> build a minimal bootable ISO.  Just installing qemu-system-x86_64
> pulls in half the world.  (Even installing libvirtd is difficult, and
> we'd prefer to avoid it).
> 
> Any ideas?
> 
> Rich.
> 
> [1] https://github.com/libguestfs/libguestfs/commit/963d6c3be7cd91c0373f67cfdd95c4f1dad1452f
> 
> -- 
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
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