text: #!/usr/bin/env python
  # Licensed to Cloudera, Inc. under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  Cloudera, Inc. licenses this file
  # to you under the Apache License, Version 2.0 (the
  # "License"); you may not use this file except in compliance
  # with the License.  You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import glob
  import logging
  import os
  import sys
  from posixpath import curdir, sep, pardir, join
  
  # The root of the Hue installation
  INSTALL_ROOT = os.path.realpath(os.path.join(os.path.dirname(__file__), '..', '..'))
  
  # The apps location
  APPS_ROOT = os.path.join(INSTALL_ROOT, 'apps')
  
  # Directory holding app.reg
  HUE_APP_REG_DIR = os.environ.get("HUE_APP_REG_DIR", INSTALL_ROOT) 
  
  # Directory holding hue.pth
  HUE_PTH_DIR = os.environ.get('HUE_PTH_DIR', None)
  
  # The Hue config directory
  HUE_CONF_DIR = os.path.join(INSTALL_ROOT, 'desktop', 'conf')
  
  # Virtual env
  VIRTUAL_ENV = os.path.join(INSTALL_ROOT, 'build', 'env')
  
  # The Python executable in virtualenv
  ENV_PYTHON = os.path.join(VIRTUAL_ENV, 'bin', 'python')
  
  def cmp_version(ver1, ver2):
    """Compare two version strings in the form of 1.2.34"""
    return cmp(ver1.split('.'), ver2.split('.'))
  
  def _get_python_lib_dir():
    glob_path = os.path.join(VIRTUAL_ENV, 'lib', 'python*')
    res = glob.glob(glob_path)
    if len(res) == 0:
      raise SystemError("Cannot find a Python installation in %s. "
                        "Did you do `make hue'?" % glob_path)
    elif len(res) > 1:
      raise SystemError("Found multiple Python installations in %s. "
                        "Please `make clean' first." % glob_path)
    return res[0]
  
  def _get_python_site_packages_dir():
    return os.path.join(_get_python_lib_dir(), 'site-packages')
  