+1

@peti I'm against this patch. As mentioned in #3426 (similar problem) I prefer there was a way to override attribute sets that are not nixos options, rather than add an option for every environment variable.

@lethalman, do you have an implementation that does this?

@peti No I'm discussing this, @edolstra in #3426 acted as the override should have worked already... perhaps adding this nix-path option is going to be an hack for a bigger problem.

Try environment.sessionVariables.NIX_PATH = mkForce [ ... ].

OK, mkForce works. You might want to consider using mkDefault on the default?