[libvirt] [PATCH] Free object after *Destroy in python bindings

[Cole Robinson]

Daniel P. Berrange wrote:
> On Mon, May 19, 2008 at 04:21:55PM -0400, Cole Robinson wrote:
>> Cole Robinson wrote:
>>> The patch below fixes an issue in the python bindings with the
>>> vir*Destroy methods. After the object is successfully destroyed,
>>> the payload is cleared, using 'self._o = None'. This unfortunately
>>> screws up virt object reference counts, as the payload should be 
>>> free'd using the appropriate vir*Free function.
>>>
>> Hmm, I might be wrong about this. Reading the virDomainDestroy
>> description in libvirt.c, destroy is supposed to free the
>> domain object if the operation is successful. The qemu driver
>> currently does not do this. In fact, from what I gather, none
>> of the drivers do this.
> 
> The docs are wrong. Destory merely hard-kills the object being managed.
> It does not free memory associated with the object.
> 
>> If the virDomainDestroy comment is correct, then the original
>> python statement is sufficient, but the drivers need to have
>> a few virDomainFree's added.
> 
> I believe your patch is correct - python should not be dropping its 
> reference to the underlying C object, afte invoking the destroy method.
> It should be only be dropped after free is called
> 
> Regards,
> Dan

Worth noting that there are actually places in the code that make the
assumption that virDomainDestroy _does_ free the domain object, such
as the remote driver and virsh. I'll send out a patch for those as
well.

Thanks,
Cole