python - "Can' t 提取文件到 egg 缓存“GAE 中的错误

Question

我有安装了 setuptools 的 Windows 7 和 Python 2.7。

在我下载 pitz 模块 (easy_install pitz) 后，Google App Engine 停止工作:

bad runtime process port ['']

Traceback (most recent call last):
  File "G:\Program Files (x86)\Google\google_appengine\_python_runtime.py", line 184, in <module>
    _run_file(__file__, globals())
  File "G:\Program Files (x86)\Google\google_appengine\_python_runtime.py", line 180, in _run_file
    execfile(script_path, globals_)
  File "G:\Program Files (x86)\Google\google_appengine\google\appengine\tools\devappserver2\python\runtime.py", line 28, in <module>
    from google.appengine.ext.remote_api import remote_api_stub
  File "G:\Program Files (x86)\Google\google_appengine\google\appengine\ext\remote_api\remote_api_stub.py", line 75, in <module>
    import yaml
  File "G:\Program Files (x86)\Google\google_appengine\lib\yaml-3.10\yaml\__init__.py", line 14, in <module>
    from cyaml import *
  File "G:\Program Files (x86)\Google\google_appengine\lib\yaml-3.10\yaml\cyaml.py", line 5, in <module>
    from _yaml import CParser, CEmitter
  File "C:\Python27\lib\site-packages\pyyaml-3.11-py2.7-win-amd64.egg\_yaml.py", line 7, in <module>
  File "C:\Python27\lib\site-packages\pyyaml-3.11-py2.7-win-amd64.egg\_yaml.py", line 4, in __bootstrap__
  File "C:\Python27\lib\site-packages\pkg_resources.py", line 950, in resource_filename
    self, resource_name
  File "C:\Python27\lib\site-packages\pkg_resources.py", line 1607, in get_resource_filename
    self._extract_resource(manager, self._eager_to_zip(name))
  File "C:\Python27\lib\site-packages\pkg_resources.py", line 1667, in _extract_resource
    manager.extraction_error()
  File "C:\Python27\lib\site-packages\pkg_resources.py", line 996, in extraction_error
    raise err
pkg_resources.ExtractionError: Can't extract file(s) to egg cache

The following error occurred while trying to extract file(s) to the Python egg
cache:

  [Error 5] : 'C:\\Users\\Kostr\\AppData\\Roaming\\Python-Eggs\\pyyaml-3.11-py2.7-win-amd64.egg-tmp\\_yaml.pyd'

The Python egg cache directory is currently set to:

  C:\Users\Kostr\AppData\Roaming\Python-Eggs

Perhaps your account does not have write access to this directory?  You can
change the cache directory by setting the PYTHON_EGG_CACHE environment
variable to point to an accessible directory.

如何解决这个问题？

Answer 1

来自:https://code.google.com/p/modwsgi/wiki/ApplicationIssues

要避免这个特殊问题，您可以在 WSGI 应用程序脚本文件的开头设置 PYTHON_EGG_CACHE 缓存环境变量。环境变量应设置为由运行 Apache 的用户拥有和/或可写的目录。

import os
os.environ['PYTHON_EGG_CACHE'] = '/usr/local/pylons/python-eggs' 

再次确保它存在。对于 Windows 用户，可能是这样的:

os.environ['PYTHON_EGG_CACHE'] = '/tmp'

或者，如果使用 mod_wsgi 2.0，还可以对在嵌入式模式下运行的应用程序使用 WSGIPythonEggs 指令，或者在使用守护程序模式时对 WSGIDaemonProcess 指令使用 python-eggs 选项。

请注意，您应该避免使用任何人都可写的目录或文件，因为这可能会危及安全。还要注意，如果在同一 Web 服务器下托管多个应用程序，它们将以同一用户身份运行，因此每个应用程序都可以查看和修改彼此的文件。如果这是一个问题，您应该将应用程序托管在以不同用户或不同系统运行的不同 Web 服务器上。或者，应用程序所需或更新的任何数据都应托管在数据库中，每个应用程序都有单独的帐户。