nixos/configuration.nix

{ lib, ... }:

with builtins;
with lib;

let
  fn = import (toString ./fn.nix) { inherit lib; };
  # Cannot use <hostName> here as those evaluations only work with existing paths >.<
  # hostName and secretPtah can be set with -I hostName=$HOSTNAME and -I secretPath=$SECRETPATH respectively
  # , defaults to the contents of /secret/hostName
  secretPath = fn.ifelse ((tryEval (toString <secretPath>)).value != false)
    (toString <secretPath>)
    (toString /secret);
  hostName = (
    findFirst
      (elem: elem.prefix == "hostName")
      { path = (fileContents "${secretPath}/hostName"); }
      nixPath
  ).path;
  machinePath = (builtins.toPath (./machines + ("/" + hostName)));
  machineFiles = fn.lst { p = machinePath; b = true; };
  configFiles = fn.lst { p = (toString ./config); b = true; };
  pkgsFiles = fn.lst { p = (toString ./pkgs); b = true; };
  serviceFiles = fn.lst { p = (toString ./services); b = true; };
in {
  imports = [
    ./options/machine.nix
    ./services/mailserver/default.nix
  ] ++ machineFiles
  ++ configFiles
  ++ pkgsFiles
  ++ serviceFiles;
}