let
  sources = import ./npins;
  metadata = import ./meta;

  lib = import ./lib/trivial.nix;

  mkNode = node: { name, nodes, ... }: {
    # Import the base configuration for each node
    imports = builtins.map (lib.mkRel ./machines/${node}) [
      "_configuration.nix"
      "_hardware-configuration.nix"
    ];

    # Include default secrets
    dgn-secrets.sources = [ ./machines/${node}/secrets ];

    # Deployment config is specified in meta.nodes.${node}.deployment
    inherit (metadata.nodes.${node}) deployment;
  };

  mkNixpkgs = node: import sources."nixos-${metadata.nodes.${node}.nixpkgs}" { };

  mkArgs = node: {
    dgn-lib = import ./lib { inherit ((mkNixpkgs node)) lib; };
  };

  nodes = builtins.attrNames metadata.nodes;
in

{
  meta = {
    nodeNixpkgs = lib.mapSingleFuse mkNixpkgs nodes;

    specialArgs = { inherit sources; meta = metadata; };

    nodeSpecialArgs = lib.mapSingleFuse mkArgs nodes;

    # TODO: Add remote builders (`machinesFile` option)
  };

  defaults = { ... }: {
    # Import the default modules
    imports = [ ./modules ];
  };
} // (lib.mapSingleFuse mkNode nodes)