Synnefo » snf-ganeti

    - redefine HPATH and HTYPE

    - optionally redefine their run requirements:

        REQ_MASTER: the LU needs to run on the master node

        REQ_BGL: the LU needs to hold the Big Ganeti Lock exclusively

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  HTYPE = None

  _OP_REQP = []

  REQ_MASTER = True

  REQ_BGL = True

    """Constructor for LogicalUnit.

    This needs to be overriden in derived classes in order to check op

    self.proc = processor

    self.op = op

    self.cfg = context.cfg

    self.context = context

    # Dicts used to declare locking needs to mcpu

    self.needed_locks = None

from ganeti import errors

from ganeti import rpc

from ganeti import cmdlib

from ganeti import logger

from ganeti import locking

    if lu_class is None:

      raise errors.OpCodeUnknown("Unknown opcode")

    # Acquire the Big Ganeti Lock exclusively if this LU requires it, and in a

    # shared fashion otherwise (to prevent concurrent run with an exclusive LU.

    self.context.glm.acquire(locking.LEVEL_CLUSTER, [locking.BGL],

                             shared=not lu_class.REQ_BGL)

    try:

      self.exclusive_BGL = lu_class.REQ_BGL

      lu.ExpandNames()

      assert lu.needed_locks is not None, "needed_locks not set by LU"

      result = self._LockAndExecLU(lu, locking.LEVEL_INSTANCE)