common.py 2.4 KB

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  1. #!/usr/bin/env python
  2. # Licensed to Cloudera, Inc. under one
  3. # or more contributor license agreements. See the NOTICE file
  4. # distributed with this work for additional information
  5. # regarding copyright ownership. Cloudera, Inc. licenses this file
  6. # to you under the Apache License, Version 2.0 (the
  7. # "License"); you may not use this file except in compliance
  8. # with the License. You may obtain a copy of the License at
  9. #
  10. # http://www.apache.org/licenses/LICENSE-2.0
  11. #
  12. # Unless required by applicable law or agreed to in writing, software
  13. # distributed under the License is distributed on an "AS IS" BASIS,
  14. # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15. # See the License for the specific language governing permissions and
  16. # limitations under the License.
  17. import glob
  18. import logging
  19. import os
  20. import sys
  21. from posixpath import curdir, sep, pardir, join
  22. # The root of the Hue installation
  23. INSTALL_ROOT = os.path.realpath(os.path.join(os.path.dirname(__file__), '..', '..'))
  24. # The apps location
  25. APPS_ROOT = os.path.join(INSTALL_ROOT, 'apps')
  26. # Directory holding app.reg
  27. HUE_APP_REG_DIR = os.environ.get("HUE_APP_REG_DIR", INSTALL_ROOT)
  28. # Directory holding hue.pth
  29. HUE_PTH_DIR = os.environ.get('HUE_PTH_DIR', None)
  30. # The Hue config directory
  31. HUE_CONF_DIR = os.path.join(INSTALL_ROOT, 'desktop', 'conf')
  32. # Virtual env
  33. VIRTUAL_ENV = os.path.join(INSTALL_ROOT, 'build', 'env')
  34. # The Python executable in virtualenv
  35. ENV_PYTHON = os.path.join(VIRTUAL_ENV, 'bin', 'python')
  36. def cmp_version(ver1, ver2):
  37. """Compare two version strings in the form of 1.2.34"""
  38. return cmp([int(v) for v in ver1.split('.')], [int(v) for v in ver2.split('.')])
  39. def _get_python_lib_dir():
  40. glob_path = os.path.join(VIRTUAL_ENV, 'lib', 'python*')
  41. res = glob.glob(glob_path)
  42. if len(res) == 0:
  43. raise SystemError("Cannot find a Python installation in %s. "
  44. "Did you do `make hue'?" % glob_path)
  45. elif len(res) > 1:
  46. raise SystemError("Found multiple Python installations in %s. "
  47. "Please `make clean' first." % glob_path)
  48. return res[0]
  49. def _get_python_site_packages_dir():
  50. return os.path.join(_get_python_lib_dir(), 'site-packages')
  51. def cmp(x, y):
  52. """
  53. Replacement for built-in function cmp that was removed in Python 3
  54. Compare the two objects x and y and return an integer according to
  55. the outcome. The return value is negative if x < y, zero if x == y
  56. and strictly positive if x > y.
  57. """
  58. return (x > y) - (x < y)