{
  lib,
  inputs,
  self,
  ...
}:
{

  # Verify the existence of a binary inside of a derivation.
  # Returns the path to the binary or throws.
  checkPath =
    pkg: bin:
    let
      abs = lib.getExe' pkg bin;
    in
    if builtins.pathExists abs then abs else throw "${abs} does not exist.";

  mkSystem =
    {
      hostname,
      extraModules ? [ ],
      system,
    }:
    lib.nixosSystem {
      inherit system;
      modules = [
        "${self}/hosts/${hostname}/configuration.nix"
        "${self}/options"
        "${self}/options/pulseview.nix"
        { networking.hostName = hostname; }
      ] ++ extraModules;
      specialArgs = {
        inherit inputs self;
        username = "ny";
      };
    };

  validatePath =
    s: if (builtins.pathExists s) then (builtins.baseNameOf s) else throw "${s} does not exist";
}