path strings truncation/mangling in PATH variable

[simone-ruffini-kaab]

Hello,

I need to use msys2 tools from PowerShell to compile a project using make. I have several path strings declared in the Windows PATH variable, and I need these paths to remain available and accessible within the "msys environment", so that make and other msys tools can properly use them. The paths are as follows:

C:\Users\username\dev\.pixi\envs\default  
C:\Users\username\dev\.pixi\envs\default\Library/mingw-w64/bin  
C:\Users\username\dev\.pixi\envs\default\Library/usr/bin  
C:\Users\username\dev\.pixi\envs\default\Library/bin  

However, when I invoke make, which, or open an msys sh shell, I notice that the PATH variable in the "msys environment" includes all the paths from my Windows PATH variable, except for the last three paths listed above. These paths are partially imported but appear to be truncated, resulting in the following transformations:

/c/Users/username/dev/.pixi/envs/default  
/mingw-w64/bin  
/usr/bin  
/bin  

I don’t understand why these specific paths are being truncated while all the others are imported correctly. Is this behavior intentional, or am I missing something in the configuration?

[jeremyd2019]

That looks like C:\Users\username\dev\.pixi\envs\default\Library is mounted as / in MSYS2 (is the root of the MSYS2 installation). What does cygpath -w / say?

[simone-ruffini-kaab]

Yes you are right, it is the root! The command outputs: C:\Users\username\dev\.pixi\envs\default\Library. But then why I'm not able to find the bianries that are in that path? And why is this happening?

[simone-ruffini-kaab]

The interesting thing is that if I look into / I see the contents of C:\Users\username\dev\.pixi\envs\default\Library but this doesn't happen to /bin. /bin is mapped to C:\Users\username\dev\.pixi\envs\default\Library/usr/bin (cygpath -w /bin) instead of C:\Users\username\dev\.pixi\envs\default\Library/bin. And maybe this is why I have this problem.

[simone-ruffini-kaab]

Could this be releated msys2/msys2-runtime#266 ?

[jeremyd2019]

sort of. msys2 mounts /usr/bin on /bin, so any files in /bin will end up hidden to msys2 processes.

[simone-ruffini-kaab]

Is there a way to avoid this?
And why it decides to mount it's root in those directories? Instead of other paths in PATH?