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[3.15] gh-149504: Fix re-entrancy bug when .pth/.start file invokes site.add sitedir() (#149659) (#149799)

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* gh-149504: Fix re-entrancy bug when .pth/.start file invokes site.addsitedir() (#149659)

* Add re-entrant tests for gh-149504
* Add end-to-end integration test coverage

This ensures that future whitebox internal test changes do not regress the
public surface semantics.

* Implement a state class to process .pth and .start files

By using this state class and managing implicit and explicit batching, we make it structurally
impossible to get bitten by re-entrant site startup processing.

Fixes #149504

(cherry picked from commit b162307d7f)

* Add myself back to CODEOWNERS
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Barry Warsaw 2026-05-13 15:45:39 -07:00 • committed by GitHub
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@ -573,9 +573,9 @@ Lib/shutil.py @giampaolo
Lib/test/test_shutil.py @giampaolo
# Site
Lib/site.py @FFY00
Lib/test/test_site.py @FFY00
Doc/library/site.rst @FFY00
Lib/site.py @FFY00 @warsaw
Lib/test/test_site.py @FFY00 @warsaw
Doc/library/site.rst @FFY00 @warsaw
# string.templatelib
Doc/library/string.templatelib.rst @lysnikolaou @AA-Turner