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Re: [Xen-devel] xenbus and the message of doom

On Tue, Dec 20, Ian Campbell wrote:

> On Tue, 2011-12-20 at 17:29 +0000, Ian Jackson wrote:
> > Konrad Rzeszutek Wilk writes ("Re: [Xen-devel] xenbus and the message of 
> > doom"):
> > > Sorry Olaf, have to revert that commit.
> > 
> > I agree.  When we introduced it we weren't aware that most existing
> > implementations of xenstored simply ignore unknown commands rather
> > than replying with an error.  If we had known this we would not have
> > approved Olaf's patch.
> > 
> > That they ignore unknown commands is of course a bug but expecting
> > everyone to update is no good.  Really the best approach would be some
> > kind of discovery mechanism.
> > 
> > Maybe we should have a special path @xenstore/fail_unknown_commands
> > which you could read, or something.  But this time we should try it
> > against old implementations.
> I was sure I'd seen some precedent (and therefore an existing path) for
> this sort of thing at some point but I can't for the life of me find it.

If you could come up with a patch to present xenstored (or other
dom0/toolstack) features, that would be great.


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