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Re: [libvirt] [PATCH libvirt-glib] gobject: add GVir.DomainShutdownFlags binding

On Fri, Aug 3, 2012 at 12:54 PM, Christophe Fergeau <cfergeau redhat com> wrote:
> On Fri, Aug 03, 2012 at 12:44:10PM +0200, Marc-André Lureau wrote:
>> The counterpart GVirDomainStartFlags uses _NONE. Is this a "flawed" in
>> libvirt API? Do we prefer to copy libvirt or do we want consitancy? I
>> prefer constitancy.
> I don't think this is a flaw, it's just that '0' has a different meaning
> depending on the API. Sometimes 0 means 'no flag', ie no additional
> behaviour, in this 'default' case, it means that the behaviour will be
> equivalent to one of the flags, but we don't indicate which one, we let the
> hypervisor choose the default one.
> So having different names for the enum for the 0 value doesn't strike me as
> inconsistent as they indicate slightly different things.

Yes, but in this particual case :

virDomainShutdownFlagValues VIR_DOMAIN_SHUTDOWN_DEFAULT        = 0,
    /* hypervisor choice */

(in libvirt Create means Launch or Start)

virDomainCreateFlags VIR_DOMAIN_NONE               = 0,      /*
Default behavior */

It would make sense if libvirt had VIR_DOMAIN_START_DEFAULT instead
(the rest of the values have DOMAIN_START prefix too..), and we use
_DEFAULT too for something that leaves libvirt hypervisor backend
choose the behavior.

Marc-André Lureau

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