File bases session backend failing on Win32

[dougn]

The new file based Session backend (ticket #2066, changeset [6333]) fails on Win23 due to the SESSION_FILE_PATH defaulting to '/tmp/'

django/trunk/django/conf/global_settings.py should get the default using the environ for the temporary storage on Win32/OSX

Adding the following to your local test settings file will work as a temporary workaround:

SESSION_FILE_PATH = os.environ['TMP']

Test Failure:

======================================================================
FAIL: Doctest: django.contrib.sessions.tests
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\django-sprint\trunk\django\test\_doctest.py", line 2169, in runTest
    raise self.failureException(self.format_failure(new.getvalue()))
AssertionError: Failed doctest test for django.contrib.sessions.tests
  File "C:\django-sprint\trunk\django\contrib\sessions\tests.py", line 0, in tests

----------------------------------------------------------------------
File "C:\django-sprint\trunk\django\contrib\sessions\tests.py", line 35, in django.contrib.sessions.tests
Failed example:
    file_session.exists(file_session.session_key)
Expected:
    True
Got:
    False


----------------------------------------------------------------------
Ran 165 tests in 291.149s

FAILED (failures=1)

[PhiR]

attached patch fixes the issue. Tested under windows and linux, but should be portable due to the use of tempfile.gettempdir().

[dougn]

I fear there might be a meta-bug in here. The failure to create the session file should have resulted in an error, not the test returning 'False' when checking to see if there is a session. The real error (which could be permission based, or even typo based), is lost somewhere. I see this as being the equivalent to not having the table created in teh database, which gives an appropriate backend exception.

[deadwisdom]

Yeah, I agree. In the meanwhile, I suggest commiting this patch asap so that tests can continue to be run on Windows.

[allandouglas@…]

Replying to deadwisdom:

Yeah, I agree. In the meanwhile, I suggest commiting this patch asap so that tests can continue to be run on Windows.

Please commit it.

[PhiR]

updated for latest revision

[Alex]

gettempdir()'s return doesn't have the trailing slash(on linux at least it returns '/tmp') would this be a problem?

[mtredinnick]

1. Imports don't belong in the middle of files. They go at the top.
2. Instead of importing tempfile unconditionally in settings.py, when it's only needed for the file-based session backend, let's have that setting default to None which will mean "at use time, it will be converted to the tmp directory's location" and then we can pick the right value in django.contrib.session.backends.file. We try fairly hard to avoid importing unneeded modules that are only going to be used rarely and this is one of those cases.

[PhiR]

Followed malcolm's guidance.

Alex: no the backend uses os.path.join so it will be added as/if needed.

[PhiR]

better patch, even has docs!

[mtredinnick]

(In [7329]) Fixed #5507 -- Use a more portable way to get at the system's tmpdir (fixes a
problem with the default on Windows). Thanks, Philippe Raoult.