[Pytest-commit] [hpk42/pytest] tmpdir names get too long on Windows (exceeding PATH_MAX) (issue #291)

[Torsten Landschoff]

New issue 291: tmpdir names get too long on Windows (exceeding PATH_MAX)
https://bitbucket.org/hpk42/pytest/issue/291/tmpdir-names-get-too-long-on-windows

Torsten Landschoff:

Hi pytest Team,

we run into a lot of error in our release tests lately, which do not occur in nightly an on-commit tests. Looking into this, I discovered that path names get too long when we are using tmpdir:

    c:\users\dynamore\appdata\local\temp\pytest-21\test_change_own_private_components_public_incoming_conflict_pull_C__jenkins_workspace_loco2_win7_32_client_release_testdata_testdb_dump_0\vaultdir\zipped\00\005292e500e4e76be18e798eccee423dec2e24c57db4b030348e67a7

On (german) Windows this results into

  WindowsError: [Error 3] Das System kann den angegebenen Pfad nicht finden

which would point to a bug in our implementation.

It is unobvious to me that tmpdir includes the following info in the path:
* the full function name
* the parameters of the test call (full path to testdb.dump over here)

This can make the temporary path arbitrary long which causes problems on Windows. I think, py.test should shorten the path automatically (at least on Windows). We can work around this by passing relative filenames (less robust in case the code does a chdir, but that would break other tests anyway) and by shorting the names of our test functions. However, I would like to keep the test function names expressive.



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