Failed to get Nix info: [Errno 2] No such file or directory: 'nix'

[mguthaus]

Description

Using the most recent OpenLane2 (2.3.6), I get an error when I run openlane --dockerized. I do not have Nix installed on my host machine. The error is:

Failed to get Nix info: [Errno 2] No such file or directory: 'nix'

Expected Behavior

I expect it to not produce the error.

Environment report

I used pip install openlane, so i did not clone openlane.

Reproduction material

No material needed. Just run:
openlane --dockerized

Relevant log output

$ openlane --dockerized
Failed to get Nix info: [Errno 2] No such file or directory: 'nix'
[06:54:24] INFO     Running containerized command:                                                                                                                                      container.py:249
docker run --rm --name 576cd69d-3108-49c4-9f22-839975534b96 -i -t --user 1000:1000 -v /home/mrg:/home/mrg -v /home/mrg/.volare:/home/mrg/.volare -e PDK_ROOT=/home/mrg/.volare -w /home/mrg/demo -v /tmp/tmppppcpvwgopenlane_docker:/tmp -e TMPDIR=/tmp -e DISPLAY=:0 -v /tmp/.X11-unix:/tmp/.X11-unix -v /home/mrg/.Xauthority:/.Xauthority --network host --security-opt seccomp=unconfined ghcr.io/efabless/openlane2:2.3.6 zsh
OpenLane Container (2.3.6):/home/mrg/demo%

[donn]

The environment detector code tries to check for Nix's existence as one of the many things it does and it seems we have forgotten to suppress its output. This will not affect operation though- --dockerized will still work fine.