[issue20053] venv and ensurepip are affected by default pip config file

[Nick Coghlan]

Nick Coghlan added the comment:

Oh, I forgot about os.devnull.

ensurepip.bootstrap mutates the environment of the current process (hence the recommendation to use the CLI instead), so yes, doing "os.environ['PIP_CONFIG_FILE'] = os.devnull" before importing pip should do the trick.

And then generate a "no-install=true" config with HOME in test_venv to make sure it is properly ignored.

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