[libvirt] [PATCH] Return right error code for baselineCPU

[Daniel P. Berrange]

On Sun, Nov 24, 2013 at 10:46:13AM -0600, Doug Goldstein wrote:
> On Sat, Nov 23, 2013 at 3:15 PM, Don Dugger <n0ano at n0ano.com> wrote:
> >
> > This Python interface code is returning a -1 on errors for the
> > `baselineCPU' API.  Since this API is supposed to return a pointer
> > the error return value should really be VIR_PY_NONE.
> >
> > NB:  I've checked all the other APIs in this file and this is the
> > only pointer API that is returning -1.
> >
> > Signed-off-by: Don Dugger <donald.d.dugger at intel.com>
> > ---
> >  python/libvirt-override.c |    8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/python/libvirt-override.c b/python/libvirt-override.c
> > index c60747d..b471605 100644
> > --- a/python/libvirt-override.c
> > +++ b/python/libvirt-override.c
> > @@ -4471,13 +4471,13 @@ libvirt_virConnectBaselineCPU(PyObject *self ATTRIBUTE_UNUSED,
> >
> >          ncpus = PyList_Size(list);
> >          if (VIR_ALLOC_N_QUIET(xmlcpus, ncpus) < 0)
> > -            return VIR_PY_INT_FAIL;
> > +            return VIR_PY_NONE;
> >
> >          for (i = 0; i < ncpus; i++) {
> >              xmlcpus[i] = PyString_AsString(PyList_GetItem(list, i));
> >              if (xmlcpus[i] == NULL) {
> >                  VIR_FREE(xmlcpus);
> > -                return VIR_PY_INT_FAIL;
> > +                return VIR_PY_NONE;
> >              }
> >          }
> >      }
> > @@ -4489,13 +4489,13 @@ libvirt_virConnectBaselineCPU(PyObject *self ATTRIBUTE_UNUSED,
> >      VIR_FREE(xmlcpus);
> >
> >      if (base_cpu == NULL)
> > -        return VIR_PY_INT_FAIL;
> > +        return VIR_PY_NONE;
> >
> >      pybase_cpu = PyString_FromString(base_cpu);
> >      VIR_FREE(base_cpu);
> >
> >      if (pybase_cpu == NULL)
> > -        return VIR_PY_INT_FAIL;
> > +        return VIR_PY_NONE;
> >
> >      return pybase_cpu;
> >  }
> > --
> > 1.7.10.4
> >
> 
> ACK. This is correct. But it obviously changes our API so I'm not
> really sure how we should handle this, (e.g. document the API as is as
> note that its broken or fix it).

The implicit expectation with python APIs is that they all raise an
exception if the libvirt call fails. So ACK to this bug fix & we
should put it in maint branches.

That said, please hold off applying this to GIT. We'll put it into
the new libvirt-python git I'm about to push instead.

Daniel
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