[libvirt] [RFC] get guest OS infos

[Daniel P. Berrange]

On Thu, Jun 11, 2015 at 08:47:12AM -0500, Dennis Jenkins wrote:
> On Thu, Jun 11, 2015 at 3:51 AM, Daniel P. Berrange <berrange at redhat.com>
> wrote:
> 
> > On Thu, Jun 11, 2015 at 09:17:30AM +0100, Daniel P. Berrange wrote:
> > > On Thu, Jun 11, 2015 at 01:51:33PM +0800, zhang bo wrote:
> > > > Different OSes have different capabilities and behaviors sometimes. We
> > have to distinguish them then.
> > > >
> > > > For example, our clients want to send NMI interrupts to certain
> > guests(eg.Linux distributions), but not others(eg.Windows guests).
> > > > They want to acquire the list below:
> > > >   guest1: RHEL 7
> > > >   guest2: RHEL 7
> > > >   guest3: Ubuntu 12
> > > >   guest4: Ubuntu 13
> > > >   guest5: Windows 7
> > > >   ......
> > > >
> > > > AFAIK, neither libvirt nor openstack, nor qemu, have such capbility of
> > showing these guest OS infos.
> > > > Libvirt now supports to show host capabilities and driver capability,
> > but not an individual guest OS's capibility. We may refer to
> > > > http://libvirt.org/formatdomaincaps.html for more information.
> > > >
> >
> 
> Hello.  I wrote a utility a few years ago to detect which OS is running in
> each qemu VM under libvirt via memory probing.  I have not touched the code
> in a few years.  YMMV.
> 
> http://pastebin.com/m0mfcK8G

FWIW, you can also use libguestfs to analyse the disk of a libvirt guest
while it is running, if you libguestfs' use readonly mode

Regards,
Daniel
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