Where is the environment variable?

Question

I have an apache2 server with active mod-wsgi, but I can't get the environment variable PYTHON_EGG_CACHE.
Here the important lines out of my virtualhost.conf:

 DAV svn SVNParentPath /var/svn SVNListParentPath Off WSGIProcessGroup sites WSGIApplicationGroup %{GLOBAL} SetEnv PYTHON_EGG_CACHE /var/trac/eggs AuthType Basic AuthName "Restricted SVN" AuthBasicProvider wsgi WSGIAuthUserScript /var/trac/cgi-bin/acctmgr_auth.wsgi Require valid-user 

And here the acctmgr_auth.wsgi:

import os, sys os.environ['PYTHON_EGG_CACHE'] = PYTHON_EGG_CACHE from trac.env import open_environment, Environment acct_mgr = None def check_password(environ, user, password): global acct_mgr # Try loading the env from the global cache, addit it if needed environ['PYTHON_EGG_CACHE'] env = open_environment(environ['trac.env_path'], use_cache=True) if acct_mgr is None: from acct_mgr.api import AccountManager acct_mgr = AccountManager if acct_mgr(env).check_password(user, password): return True else: return False def groups_for_user(environ, user): return [''] 

The single environ['PYTHON_EGG_CACHE'] is just a test, but I get a

KeyError: 'PYTHON_EGG_CACHE'

.

I also tried following, but I get the same error as above:

 RewriteCond ${lowercase:%{REQUEST_URI}} ^/svn/([^/]+) RewriteRule . - [E=trac.svn_path:/var/trac/envs/%1] 

What is wrong?

Thanks for any advices.

EDIT: After some resarch I think I found the problem. The mod_dav is configured for the location /svn and it processes the request immediately, so the rewritecond and rewriterule will be ignored.
Is there any possibility to set environment variables with mod_dav?

Answer 1

This is how I did it on my django site, where the path is set in the apache file (as MY_PATH). Notice that I copy it into the os.environ variable.

import os, sys, django.core.handlers.wsgi _application = django.core.handlers.wsgi.WSGIHandler() def application(environ, start_response): path = environ['MY_PATH'] if path not in sys.path: sys.path.append(path) os.environ['MY_PATH'] = environ['MY_PATH'] from django.conf import settings settings.DEBUG = True return _application(environ, start_response) 

Since I copied the environment variable to the os.environ, I can now use it (for example) in the settings file. Note that I have set all the os.environ variables before including the settings. In the settings I get it like so:

import os PATH = os.environ['MY_PATH'] 

Answer 2

SetEnv usually only sets process environment variables when using CGI. For mod_wsgi, SetEnv variables go into per request WSGI environment and not the process environment.
Thus they aren't accessible from global scope in WSGI script and even in the application callable, you have to access them from environ dictionary passed as argument.

Answer 3

I found a solution by using the content of environ['REQUEST_URI'] and check it in the python file.
More details can you find here: http://trac-hacks.org/ticket/8525