nixos/configuration.nix

{ lib, ... }:

with builtins;
with lib;

let
  fn = import ./fn.nix { inherit lib; };
  # hostName can be set with -I hostName=$HOSTNAME, defaults to the contents of /secret/hostName
  hostName = let
    hostVal = (tryEval <hostName>).value;
  in fn.ifelse (hostVal != false)
    hostVal
    (fileContents /secret/hostName);
  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;
}