Add a pytest option to not reinterpret exceptions in hooks

[pytestbot]

Originally reported by: Vyacheslav Rafalskiy (BitBucket: s4g, GitHub: s4g)

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In some use cases, especially in functional testing, the pytest_configure(), pytest_sessionstart() and other hooks can be loaded with heavy setup code, which can fail in many different ways. If exceptions in such code are reinterpreted, as is the case in pytest 2.0.2, the important pre-formatted messages and traces are lost, or at least disfigured by long listings with every line prepended with 'INTERNALERROR>'.

It is desirable to be able to avoid such reinterpretation with a command-line option or other means.

Presently, I use the following monkey-patch as a workaround:

#!python

import sys, _pytest.core

def _notify_exception(self, excinfo):
    excrepr = excinfo.getrepr(style='native')
    sys.stderr.write(excrepr)

_pytest.core.PluginManager.notify_exception = _notify_exception

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/38

[pytestbot]

Original comment by holger krekel (BitBucket: hpk42, GitHub: hpk42):

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fix issue38 - nicer tracebacks on sessionstart/configure (and other internal/custom hook failures)

[pytestbot]

Original comment by holger krekel (BitBucket: hpk42, GitHub: hpk42):

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you can try out the fix with "pip install -U pytest -i http://pypi.testrun.org" - traceback will be "native" and it's also possible to specify "--fulltrace" in order to get a full traceback.