IOError when writing --junitxml report when run via xdist, sometimes

[pytestbot]

Originally reported by: reuben fletcher-costin (BitBucket: rfc, GitHub: rfc)

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Hi,

py.test crashed 3 out of 10 times when using py.test -n8 --junitxml report.xml to run the following trivial test:

#!python

def test_foo():
    assert True

When it crashes, the output looks like this (although sometimes more than 1 node may crash per run):

#!text

C:\test_pytest>py.test -n8 --junitxml report.xml
===================================================================== test session starts ====================
platform win32 -- Python 2.7.3 -- pytest-2.3.4
plugins: cov, xdist
gw0 [0] / gw1 [0] / gw2 [0] / gw3 [0] / gw4 [0] / gw5 [0] / gw6 [0] / gw7 [0]
scheduling tests via LoadScheduling
[gw5] node down: Traceback (most recent call last):
  File "C:\Python27\lib\site-packages\execnet\gateway_base.py", line 800, in executetask
    do_exec(co, loc)
  File "<string>", line 1, in do_exec
  File "", line 139, in <module>
  File "C:\Python27\lib\site-packages\_pytest\core.py", line 422, in __call__
    return self._docall(methods, kwargs)
  File "C:\Python27\lib\site-packages\_pytest\core.py", line 433, in _docall
    res = mc.execute()
  File "C:\Python27\lib\site-packages\_pytest\core.py", line 351, in execute
    res = method(**kwargs)
  File "C:\Python27\lib\site-packages\_pytest\main.py", line 107, in pytest_cmdline_main
    return wrap_session(config, _main)
  File "C:\Python27\lib\site-packages\_pytest\main.py", line 99, in wrap_session
    exitstatus=session.exitstatus or (session._testsfailed and 1))
  File "C:\Python27\lib\site-packages\_pytest\core.py", line 422, in __call__
    return self._docall(methods, kwargs)
  File "C:\Python27\lib\site-packages\_pytest\core.py", line 433, in _docall
    res = mc.execute()
  File "C:\Python27\lib\site-packages\_pytest\core.py", line 351, in execute
    res = method(**kwargs)
  File "C:\Python27\lib\site-packages\_pytest\junitxml.py", line 202, in pytest_sessionfinish
    logfile = py.std.codecs.open(self.logfile, 'w', encoding='utf-8')
  File "C:\Python27\lib\codecs.py", line 881, in open
    file = __builtin__.open(filename, mode, buffering)
IOError: [Errno 22] invalid mode ('wb') or filename: 'C:\\test_pytest\\report.xml'


-------------------------------------------------------- generated xml file: C:\test_pytest\report.xml -------
======================================================================  in 1.47 seconds ======================

These results are from windows 7 professional with python 2.7.3, running on a machine with four cores:

#!text

py.test --version
This is py.test version 2.3.4, imported from C:\Python27\lib\site-packages\pytest.pyc
setuptools registered plugins:
  pytest-cov-1.6 at C:\Python27\lib\site-packages\pytest_cov.pyc
  pytest-xdist-1.8 at C:\Python27\lib\site-packages\xdist\plugin.pyc

python --version
Python 2.7.3

>>> import execnet
>>> execnet.__version__
'1.1'

My guess: perhaps each node is writing its own copy of the xml report to the same filename.

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/271

[pytestbot]

Original comment by Ronny Pfannschmidt (BitBucket: RonnyPfannschmidt, GitHub: RonnyPfannschmidt):

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fix issue 271 - dont write junitxml on slave nodes