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The virtualenv activate script does not correctly detect the Windows Git Bash shell #125398

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@julienp

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@julienp

Bug report

Bug description:

When using the virtualenv activate script in Git Bash for Windows, the environment is not correctly detected and paths are not converted.

This results in $PATH being set to something like D:\a\github-actions-shells\github-actions-shells\venv/Scripts:..., instead of /d/a/github-actions-shells/github-actions-shells/venv/Scripts.

Prior to #112508, the detection used $OSTYPE, which reports msys in Git Bash for Windows, however uname returns MINGW....

This is a regression in Python 3.13.0

CPython versions tested on:

3.13

Operating systems tested on:

Windows

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    stdlibPython modules in the Lib dirtopic-venvRelated to the venv moduletype-bugAn unexpected behavior, bug, or error

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