FreeSpace.py

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#!/usr/local/bin/python
#
#                               Copyright 2005
#                                     by
#                        The Board of Trustees of the
#                     Leland Stanford Junior University.
#                            All rights reserved.
#

__facility__ = "Online"
__abstract__ = "GLAST LAT free disk space utility functions"
__author__   = "Jim Panetta <panetta@SLAC.Stanford.edu> SLAC - GLAST LAT I&T/Online"
__date__     = "2005/07/23 00:08:27"
__updated__  = "$Date: 2006/02/08 15:14:51 $"
__version__  = "$Revision: 1.6 $"
__release__  = "$Name: HEAD $"
__credits__  = "SLAC"

import LICOS.copyright_SLAC


import os

def FreeSpace(filePath=None):
  """!\brief freespace(path) -> long.

  Return the number of bytes available to the user on the file system
  pointed to by path.

  \return Disk freespace
  """
  try:
    os.statvfs          # doesn't fail if we're on unix
  except AttributeError:
    # Win32 implementation
    try:
      if filePath is None: filePath = 'C:/'  # Root level directory
      import win32file
      return win32file.GetDiskFreeSpaceEx(filePath)[0]
    except Exception, e:
      print 'FreeSpace() exception: ', e, ' path ', filePath
      return long(-1)
  else:
    # Unix implementation
    try:
      if filePath is None: filePath = '.'    # Current working directory
      if filePath == '': filePath = '.'    # Current working directory
      import statvfs
      s = os.statvfs(filePath)
      return s[statvfs.F_BAVAIL] * long(s[statvfs.F_BSIZE])
    except Exception, e:
      print 'FreeSpace() exception: ', e
      return long(-1)

  # should never get here
  return long(-1)

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