Re: [Xen-devel] domain key gone from xenstore when calling offline hotplug scripts

["Christopher S. Aker" <caker@xxxxxxxxxxxx>]

Ewan Mellor wrote:
> On Fri, Dec 09, 2005 at 05:00:24AM -0600, Christopher S. Aker wrote:
>
> > I'm using a custom vif-script and I've noticed that when the "offline" 
> > mode is called, I'm unable to retrieve the domain key from xenstore, 
> > most likely because the domain has already been destroyed.
> > Is there any way to defer the removal of those keys until $vif-script 
> > offline has been called, or possibly retain it in xend and pass it along 
> > as a command arg?  The domain value is useful in the network 
> > deconstruction I'm performing.
> What do you mean by "the domain key"?  You get the path to the domain, the
> device type and the vif ID passed as environment variables -- this should be
> sufficient for you to use as a key to other databases or whathaveyou.  What
> else do you require?
What's passed in is the xenstore path to that specific vif's backend 
entries, for example "backend/vif/26/0".  In 'online' mode 
backend/vif/26/0/domain exists.  In 'offline' mode, none of that data is 
accessible, or at least the domain entry is no longer there.
I could store the associations between vifs and domainIDs/domain names 
locally and perform lookups, but I was just looking for a xend provided 
method to grab the domain(id) that "owned" the vif we're bringing offline.
Thanks,
-Chris

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