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"""Utility functions for LVM.

"""

def CheckVolumeGroupSize(vglist, vgname, minsize):

  """Checks if the volume group list is valid.

  The function will check if a given volume group is in the list of

  volume groups and has a minimum size.

  @type vglist: dict

  @param vglist: dictionary of volume group names and their size

  @type vgname: str

  @param vgname: the volume group we should check

  @type minsize: int

  @param minsize: the minimum size we accept

  @rtype: None or str

  @return: None for success, otherwise the error message

  """

  vgsize = vglist.get(vgname, None)

  if vgsize is None:

    return "volume group '%s' missing" % vgname

  elif vgsize < minsize:

    return ("volume group '%s' too small (%s MiB required, %d MiB found)" %

            (vgname, minsize, vgsize))

  return None