Set nix path using home manager when not using nixos

[amardeep]

I would like non-flake nix commands to refer to same nixpkgs version as the flake.

I am guessing right now it is done in standard/nixos/configuration.nix

nixPath = lib.mapAttrsToList (key: value: "${key}=${value.to.path}") config.nix.registry;

How to do this in home manager when not running on nixos? I am using nix on macos and not using nix-darwin

[Misterio77]

Hey!

NixOS implements nix.nixPath by setting the NIX_PATH environment variable:
https://github.com/NixOS/nixpkgs/blob/9ef6e7727f4c31507627815d4f8679c5841efb00/nixos/modules/services/misc/nix-daemon.nix#L796

Home manager does not currently have this abstraction, but perhaps you should be able to do the same using home.sessionVariables; maybe even make this a contribution to hm?

[amardeep]

Thanks,

For now, my issue is solved by adding the following section:

    home.sessionVariables = {
      NIX_PATH = "nixpkgs=${inputs.nixpkgs}";
    };