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Using pchroot in pytest script fails
The following script run with pytest fails with:
E io.UnsupportedOperation: redirected stdin is pseudofile, has no fileno()
from pychroot import Chroot
import os
chroot_path = '/tmp/foo/bar'
os.makedirs( chroot_path, exist_ok=True)
def test_chroot () :
with Chroot( chroot_path ) :
answer = 42
print( answer )
Output:
$ pytest chroot_test.py
========================== test session starts ===========================
platform linux -- Python 3.6.7, pytest-5.3.2, py-1.8.1, pluggy-0.13.1
rootdir: /tmp
collected 1 item
chroot_test.py F [100%]
================================ FAILURES ================================
______________________________ test_chroot _______________________________
def test_chroot () :
with Chroot( chroot_path ) :
> answer = 42
chroot_test.py:10:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
def test_chroot () :
with Chroot( chroot_path ) :
> answer = 42
chroot_test.py:10:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <pychroot.base.Chroot object at 0x7fe1ec9d0ef0>
frame = <frame object at 0x7fe1eb906048>, event = 'line', arg = None
def __invoke_trace_funcs(self, frame, event, arg):
"""Invoke all trace funcs that have been injected.
Once the injected functions have been executed all trace hooks are
removed in order to minimize overhead.
"""
try:
for func in self.__injected_trace_funcs[frame]:
> func(frame, event, arg)
/home/brendan/SEPL/brickstrap/brickstrap/ind-efd/venv_3.6.7/lib/python3.6/site-packages/snakeoil/contexts.py:237:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <pychroot.base.Chroot object at 0x7fe1ec9d0ef0>
frame = <frame object at 0x7fe1eb906048>, event = 'line', arg = None
def __exit_context(self, frame, event, arg):
"""Simple function to throw a ParentException."""
> raise self.ParentException()
E snakeoil.contexts.SplitExec.ParentException
/home/brendan/SEPL/brickstrap/brickstrap/ind-efd/venv_3.6.7/lib/python3.6/site-packages/snakeoil/contexts.py:212: ParentException
During handling of the above exception, another exception occurred:
def test_chroot () :
with Chroot( chroot_path ) :
answer = 42
> print(answer)
chroot_test.py:11:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <pychroot.base.Chroot object at 0x7fe1ec9d0ef0>
exc_type = <class 'snakeoil.contexts.SplitExec.ParentException'>
exc_value = ParentException()
exc_traceback = <traceback object at 0x7fe1eb8f3308>
def __exit__(self, exc_type, exc_value, exc_traceback):
if self.childpid is not None:
# make sure system tracing function is reset
self.__revert_tracing(inspect.currentframe())
# re-raise unknown exceptions from the parent
if exc_type is not self.ParentException:
raise exc_value
# get exception from the child
try:
exc = self.__pipe.recv()
self.locals = exc._locals
except EOFError as e:
exc = SystemExit(e)
# handle child exiting abnormally
if not isinstance(exc, SystemExit):
os.waitpid(self.childpid, 0)
self._exception_cleanup()
sys.excepthook = self.__excepthook
> raise exc
E io.UnsupportedOperation: redirected stdin is pseudofile, has no fileno()
/home/brendan/SEPL/brickstrap/brickstrap/ind-efd/venv_3.6.7/lib/python3.6/site-packages/snakeoil/contexts.py:163: UnsupportedOperation
=========================== 1 failed in 0.11s ============================
(venv_3.6.7) brendan@osboxes:/tmp$
pychroot often doesn't handle running within pytest's modified testing environment at this point without mocking out various aspects. In this case you'd need to run the tests with pytest's stdin/stdout capturing disabled (use the -s argument for pytest).
Patches accepted if you can figure out how to improve the situation, but I don't want to insert hacks into the codebase to work around specific test platform quirks.
