Say I’m using nixos to configure nginx and I want to verify the result with my own eyes. Where do I go? Nginx isn’t in /etc/nginx. It’s locked away somewhere in /nix/store/. You can always still verify, even before you apply the changes by running the following:

nixos-rebuild build                  # generate the local `result` directory
nix-store -qR result | grep nginx    # search the `result` directory for all nginx related files