__init__.py

#
#

# Copyright (C) 2006, 2007, 2008 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.


"""Virtualization interface abstraction

"""

from ganeti import constants
from ganeti import errors

from ganeti.hypervisor import hv_fake
from ganeti.hypervisor import hv_xen
from ganeti.hypervisor import hv_kvm


_HYPERVISOR_MAP = {
    constants.HT_XEN_PVM30: hv_xen.XenPvmHypervisor,
    constants.HT_XEN_HVM31: hv_xen.XenHvmHypervisor,
    constants.HT_FAKE: hv_fake.FakeHypervisor,
    constants.HT_KVM: hv_kvm.KVMHypervisor,
    }


def GetHypervisor(cfg):
  """Return a Hypervisor instance.

  This function parses the cluster hypervisor configuration file and
  instantiates a class based on the value of this file.

  @param cfg: Configuration object

  """
  ht_kind = cfg.GetHypervisorType()

  if ht_kind not in _HYPERVISOR_MAP:
    raise errors.HypervisorError("Unknown hypervisor type '%s'" % ht_kind)

  cls = _HYPERVISOR_MAP[ht_kind]
  return cls()