Use sitecustomize.py to implement environment layering
#5462
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charliermarsh
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Jul 25, 2024
| Resolved 1 package in [TIME] | ||
| Prepared 1 package in [TIME] | ||
| Installed 1 package in [TIME] | ||
| + foo==1.0.0 (from file://[TEMP_DIR]/) |
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Amazingly, this test fails on main. Can't believe we hadn't tried this yet.
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Summary
After consultation with @carljm, we learned that modifying
PYTHONPATHis insufficient, because Python won't resolve.pthfiles (editables) in the base environment. We also saw in #5459 that continuously appending toPYTHONPATHcan have some unintended effects.This PR instead uses a
sitecustomize.pyin the ephemeral environment to add the base environment'ssite-packages.Closes #5459.