[libvirt] How to differentiate creation from migration?

[Daniel P. Berrange]

On Wed, Mar 10, 2010 at 04:11:30PM +0100, Daniel Veillard wrote:
> On Wed, Mar 10, 2010 at 11:40:44AM -0300, Richard Maciel wrote:
> > Hi,
> > 
> > I work on a project that makes use of libvirt (called libvirt-cim)
> > and we created an algorithm to detect when a new machine is created.
> > However, I need to filter the ones created by the migration
> > operation.
> > 
> > Does libvirt provides a way to distinguish a machine created by
> > 'migrate' command from a machine created by the 'define' command
> > (virDomainDefineXML API call)?
> 
>   I think that if you register for domain lifetime events then
> you will get this informations as part of the details, but asynchronously
> 
> http://libvirt.org/html/libvirt-libvirt.html#virConnectDomainEventRegister

Yes, this will give you an event

   VIR_DOMAIN_EVENT_STARTED 

with a detail field containing one of the following

    VIR_DOMAIN_EVENT_STARTED_BOOTED = 0,   /* Normal startup from boot */
    VIR_DOMAIN_EVENT_STARTED_MIGRATED = 1, /* Incoming migration from another host */
    VIR_DOMAIN_EVENT_STARTED_RESTORED = 2, /* Restored from a state file */


NB, we do not require that all drivers support the detail field. At this
time, only KVM/QEMU driver will fill in the detail field. Others (Xen, etc)
will always set VIR_DOMAIN_EVENT_STARTED_BOOTED

Regards,
Daniel
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