I need to manipulate the PYTHONPATH of a few

python_test

targets. The script that normally runs the code under test manipulates PYTHONPATH (and actually mucks directly with sys.path). There is a bash script that handles manipulating the PYTHONPATH before running nosetest on those tests, thus accomplishing something similar. I want pants to run the tests, which means pytest instead of nosetest (hooray), but I've got to replace that PYTHONPATH manipulation logic within pants. Of course, within pants, I would actually need to extend

PEX_EXTRA_SYS_PATH

instead of PYTHONPATH (since pytest is run hermetically). Has anyone else written a plugin that injects env vars for particular pytest runs?

PytestPluginSetup

looks great, but it can only inject files in the pytest sandbox. I'm hoping there's a way to do this without extending

PytestPluginSetup

, so I can use it with released versions of pants. Can plugins modify a target's field's value, say by injecting a value for

python_test(extra_env_vars=...)

?