[issue41129] setup.py test for macOS SDK files may incorrectly classify files in other file systems

[Ronald Oussoren]

Ronald Oussoren <ronaldoussoren at mac.com> added the comment:

> For some background, our network location /mathworks is usually mounted at root, but due to the restrictions on macOS Catalina, it mounts at /System/Volumes/Data and we then add a symlink to the root directory so "/mathworks -> /System/Volumes/Data/mathworks" as to not break old code and scripts. So the real problem is that we cannot find extension module files under /System/Volumes/Data.

Could you tell more about this? Why is this share mounted under /System/Volumes/Data and not under /Volumes? 

With the direction Apple is moving in I'm a bit surprised that this works at all, the direction seems to be toward a completely read-only tree in /System in /usr (except for /usr/local).

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<https://bugs.python.org/issue41129>
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