Comment 1 for bug 723621

We should stub out is_vdi_pv in virt/xenapi/vm_utils.py:

        def is_vdi_pv(dev):
            LOG.debug(_("Running pygrub against %s"), dev)
            output = os.popen('pygrub -qn /dev/%s' % dev)
            for line in output.readlines():
                #try to find kernel string
                m = re.search('(?<=kernel:)/.*(?:>)', line)
                if m and m.group(0).find('xen') != -1:
                    LOG.debug(_("Found Xen kernel %s") % m.group(0))
                    return True
            LOG.debug(_("No Xen kernel found. Booting HVM."))
            return False
        return with_vdi_attached_here(session, vdi_ref, True, is_vdi_pv)

The test does not fail because we do not check pygrub's exit code, we just parse its output (which is "pygrub: not found"!). If we are unable to find the string for a PV kernel in the output we automatically assume HVM.

I will stub out this function.