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test command won't have dependencies on sys.path in subprocess #794

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jaraco opened this issue Sep 17, 2016 · 1 comment
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test command won't have dependencies on sys.path in subprocess #794

jaraco opened this issue Sep 17, 2016 · 1 comment

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@jaraco
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jaraco commented Sep 17, 2016

When running the test command, or any other command that invokes with_project_on_sys_path, setuptools ensures those projects are on sys.path, but if a subprocess is launched that relies on those dependencies such as tox does or any other project that launches subprocesses to create fixtures or launch services, that subprocess won't have the projects on sys.path so will fail, as reported in tox-dev/tox#360.

On project I maintain works around this issue by adding all of sys.path to PYTHONPATH for the subprocesses. Setuptools should do something similar (though more elegant by matching only those projects added), enabling this use case in general.
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jaraco commented Sep 17, 2016

It's not just the stage where with_project_on_sys_path is called, but also fetch_build_eggs.

@jaraco jaraco closed this as completed in 5e4eea7 Sep 17, 2016
This was referenced Sep 17, 2016
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jsonn referenced this issue in jsonn/pkgsrc Jan 22, 2017
Updated py-test-runner to 2.10.1.
5245e0a 
2.10.1
~~~~~~

* #21: Avoid mutating dictionary keys during iteration.

2.10
~~~~

* #20: Leverage technique in `setuptools 794
  <https://github.com/pypa/setuptools/issues/794>`_
  to populate PYTHONPATH during test runs such that
  Python subprocesses will have a dependency context
  comparable to the test runner.
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@jaraco