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Re: [libvirt] [PATCH] Fix sexpr2string() to handle empty list

On Wed, Aug 26, 2009 at 11:39:54AM -0600, Jim Fehlig wrote:
> Finally have some time to submit this small patch for a bug I'm seeing
> with Xen 3.3.1.
> If s-expression returned by xend contains an empty list, sexpr2string()
> failed to serialize it.  E.g. sexpr containing (cpus (()())) would cause
> sexpr2string() to fail.

  I see that Dan already applied you patch, so that's in !

> I spoke with danpb on IRC about this bug and he suggested adding a
> XML/sexpr pair that exhibits the problem to tests/xml2sexprtest.c.  I
> can easily produce the sexpr but not the case with XML.  The empty cpus
> lists indicate no explicit affinity and AFAIK the only way to express
> this in XML is absence of cpuset attribute in vcpu element.  But IMO we
> should not produce the (cpus (()()...)) sexpr in this case.  It should
> only be produced when user has explicitly specified affinity.  Does this
> sound reasonable?

  I think so, yes. But it depends mostly on xend expectations, and that too
may have changed over time (I hope not).


Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
daniel veillard com  | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library  http://libvirt.org/

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