[3.13] gh-117505: Run ensurepip in isolated env in Windows installer (GH-118257) #119421
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…ythonGH-118257) ensurepip forks a subprocess to run pip itself, but that subprocess only inherits a -I isolated mode flag (see _run_pip() in Lib/ensurepip/__init__.py), not the "-E -s" flags that the installer has been using. This means that parts of ensurepip don't actually run in an isolated environment and can make incorrect decisions based on packages installed in the user site-packages. (cherry picked from commit c9073eb) Co-authored-by: Michael Vincent <377567+Vynce@users.noreply.github.com>
This was referenced May 22, 2024
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ensurepip forks a subprocess to run pip itself, but that subprocess only inherits a -I isolated mode flag (see _run_pip() in Lib/ensurepip/init.py), not the "-E -s" flags that the installer has been using. This means that parts of ensurepip don't actually run in an isolated environment and can make incorrect decisions based on packages installed in the user site-packages.
(cherry picked from commit c9073eb)
Co-authored-by: Michael Vincent 377567+Vynce@users.noreply.github.com