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# Copyright (C) 2006, 2007, 2008 Google Inc.

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# This program is free software; you can redistribute it and/or modify

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"""Virtualization interface abstraction

"""

from ganeti import ssconf

from ganeti import constants

from ganeti import errors

from ganeti.hypervisor import hv_fake

from ganeti.hypervisor import hv_xen

_HYPERVISOR_MAP = {

    constants.HT_XEN_PVM30: hv_xen.XenPvmHypervisor,

    constants.HT_XEN_HVM31: hv_xen.XenHvmHypervisor,

    constants.HT_FAKE: hv_fake.FakeHypervisor,

    }

def GetHypervisor():

  """Return a Hypervisor instance.

  This function parses the cluster hypervisor configuration file and

  instantiates a class based on the value of this file.

  """

  ht_kind = ssconf.SimpleStore().GetHypervisorType()

  if ht_kind not in _HYPERVISOR_MAP:

    raise errors.HypervisorError("Unknown hypervisor type '%s'" % ht_kind)

  cls = _HYPERVISOR_MAP[ht_kind]

  return cls()