In reply to @roberthensing:matrix.org
the alternative is to import wherever you read or write them, but that's not idiomatic, sadly

In reply to @roberthensing:matrix.org
bit of a tangent there, imports in defaults is the best place in this situation even if NixOS were different

Robert Hensing (roberth) it works, here's my module:

{ config, name, pkgs, lib, ... }: {
  options = with lib; {
    deployment = {

      slurmNodeConfig = mkOption {
        type = types.str;
        description = "Node configuration for Slurm";
        readOnly = true;
      };

      slurm = mkOption {
        type = with types; attrsOf (oneOf [ int str ]);
        description =
          "Attribute set that is coerced into the Slurm Node config";
        default = { };
        example = {
          CPUs = 2;
          RealMemory = 2000;
          TmpDisk = 64000;
        };
      };
    };
  };

  config = {
    deployment.slurmNodeConfig = "NodeName=${name} "
      + (lib.concatStringsSep " "
        (lib.mapAttrsToList (n: v: "${n}=${toString v}")
          config.deployment.slurm));
  };
}

And in the libvirtd target I'm using it like this:

{
  defaults = { config, ... }: {
    imports = [
      ./options/deployment.nix
    ];
    
    deployment = {
      targetEnv = "libvirtd";
      libvirtd = {
        vcpu = 2;
        memorySize = 1024;
        headless = false;
        baseImageSize = 10;
      };

      slurm = {
        CPUs = config.deployment.libvirtd.vcpu - 1;
        RealMemory = config.deployment.libvirtd.memorySize;
        MemSpecLimit = 256;
      };
    };
  };
}

In reply to @zaphar_ps:matrix.org
Hrmmm so it seems importing <nixpkgs/nixos/modules/virtualisation/google-compute-image.nix>causes the boto error not nixops.