[libvirt] [PATCH 3/3] Add new libvirt-babysitter tool

[Daniel P. Berrange]

On Tue, Oct 09, 2012 at 01:18:56PM +0200, Alexander Larsson wrote:
> On tis, 2012-10-09 at 12:14 +0100, Daniel P. Berrange wrote:
> > On Mon, Oct 08, 2012 at 04:57:49PM +0200, Alexander Larsson wrote:
> > > This helper registers with the session bus and libvirt and ensures
> > > that we properly save the state when the session exits. It does this
> > > in two ways:
> > > 
> > > 1) Whenever the session dbus connection is disconnected (typically due
> > > to a logout) we save all domains in the session libvirtd.
> > > 
> > > 2) Whenever there is a active domain in the session libvirtd we
> > > take a shutdown inhibition lock[1] which means that systemd will
> > > delay shutdown until we saved any active VMs. We then save the VM
> > > when we get a PrepareForShutdown event (or when the session dies as
> > > in 1).
> > > 
> > > [1] http://www.freedesktop.org/wiki/Software/systemd/inhibit
> > 
> > 
> > In general I think this is a neat idea. We currently have a nasty
> > shell script that we trigger on host shutdown to save/migrate/etc
> > VMs. Although it is not as featureful, I like that this code is
> > using our APIs instead of shell code.
> > 
> > My primary feedback would be that this could actually be run
> > inside libvirtd itself.
> 
> Ok, I'll try that out then.
> 
> Btw, how do i tell libvirtd to exit? Just call exit(0)?

The best way is to call virNetServerQuit() on the virNetServerPtr object
since this allows it todo graceful cleanup

Daniel
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