How to debug build command?

[heckad]

I want to install a package in my container using setup.py file. I did it by

RUN --mount=type=bind python setup.py install

but got

python: can't open file '/home/app/setup.py': [Errno 2] No such file or directory

I use windows 10 os with Docker version 20.10.0, build 7287ab3 running in wsl.

[tonistiigi]

We're trying to improve this in #1472

Atm, to debug mounts I'd recommend just running ls and mount to see that all files you expect are there.