Fix sporadic buildbot failures for test_mailbox

[jkloth]

BPO	17064
Nosy	@jkloth, @bitdancer
Files	test_mailbox.diff

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2013-02-11.15:15:46.150>
created_at = <Date 2013-01-28.17:14:19.519>
labels = ['type-bug', 'tests']
title = 'Fix sporadic buildbot failures for test_mailbox'
updated_at = <Date 2013-02-11.15:15:46.148>
user = 'https://github.com/jkloth'

bugs.python.org fields:

activity = <Date 2013-02-11.15:15:46.148>
actor = 'r.david.murray'
assignee = 'none'
closed = True
closed_date = <Date 2013-02-11.15:15:46.150>
closer = 'r.david.murray'
components = ['Tests']
creation = <Date 2013-01-28.17:14:19.519>
creator = 'jkloth'
dependencies = []
files = ['28882']
hgrepos = []
issue_num = 17064
keywords = ['patch']
message_count = 6.0
messages = ['180862', '180864', '180868', '180875', '181896', '181897']
nosy_count = 3.0
nosy_names = ['jkloth', 'r.david.murray', 'python-dev']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue17064'
versions = ['Python 2.7', 'Python 3.2', 'Python 3.3', 'Python 3.4']

[jkloth]

Attached is an attempt at fixing the sporadic failures of test_mailbox on the AMD64 Windows buildbot.

It fails due to access errors on some directories which leads me to believe the helper functions in test.support should fix the problem.

[bitdancer]

I think the support functions just ignore errors. Isn't this going to continue to leave garbage on the buildbot filesystem without fixing the underlying problem? I wonder if this is a variation on the usual Windows access errors, in which case perhaps that is the best we can do...

[jkloth]

Actually, the support functions (as of 3.3) attempt to work around the access errors. They attempt to wait (to a point) for a successful operation before returning to the caller. See bpo-15496 for details.

It is usually the case that the previous operation has not yet finished as to the cause of the access error.

[bitdancer]

Ah, excellent. I had missed that change.

This looks good then. Hopefully it will work :)

[python-dev]

New changeset bbeff2958cc5 by R David Murray in branch '3.2':
bpo-17064: fix sporadic permission errors in test_mailbox on windows.
http://hg.python.org/cpython/rev/bbeff2958cc5

New changeset 3e3915cbfde3 by R David Murray in branch '3.3':
Merge: bpo-17064: fix sporadic permission errors in test_mailbox on windows.
http://hg.python.org/cpython/rev/3e3915cbfde3

New changeset aa15df77e58f by R David Murray in branch 'default':
Merge: bpo-17064: fix sporadic permission errors in test_mailbox on windows.
http://hg.python.org/cpython/rev/aa15df77e58f

New changeset 1c2dbed859ca by R David Murray in branch '2.7':
bpo-17064: fix sporadic permission errors in test_mailbox on windows.
http://hg.python.org/cpython/rev/1c2dbed859ca

[bitdancer]

Thanks, Jeremy.