Avoid race: Install initial configuration statically

[syncthing-autoregister] / tests / automatic-enrollment.nix

import <nixpkgs/nixos/tests/make-test-python.nix> ({ pkgs, lib, ... }:
  let
    configuration = pkgs.writeText "configuration.nix" ''
      { pkgs, ... }: {
        imports = [
          ${../.}/modules/syncthing-autoregister.nix
          <nixos/nixos/modules/installer/cd-dvd/channel.nix>
        ];
        services.syncthing = {
          enable = true;
          openDefaultPorts = true;
          autoRegister = {
            enable = true;
            path = "/tmp/syncthing-auto-register-test-device-ids.nix";
          };
        };
        environment.systemPackages = with pkgs; [ nix ];
      }
    '';
    initialConfiguration = pkgs.writeText "initial-configuration.nix" ''
      {
        imports = [ "${configuration}" ];
        system.activationScripts.installInitialConfiguration = {
          text = '''
            mkdir -p /etc/nixos
            cp "${configuration}" /etc/nixos/configuration.nix
          ''';
          deps = [ ];
        };
      }
    '';
    configurationWithDeviceIDs =
      pkgs.writeText "configuration-with-device-ids.nix" ''
        {
          imports = [
            ${configuration}
            /tmp/syncthing-auto-register-test-device-ids.nix
          ];
        }
      '';
  in {

    name = "syncthing";

    nodes = {
      a = "${initialConfiguration}";
      b = "${initialConfiguration}";
    };

    testScript = ''
      def setConfig(machine, config):
          machine.copy_from_host(config, "/etc/nixos/configuration.nix")


      def verifyDeviceIDSet(machine, expectedDevice):
          machine.succeed(
              '(( "$(nix eval --raw -f "<nixos/nixos>" config.services.syncthing.declarative.devices.%s.id | wc -c)" == 63 ))'
              % expectedDevice
          )


      configurationWithDeviceIDs = (
          "${configurationWithDeviceIDs}"
      )

      a.wait_for_unit("syncthing-autoregister.service")
      setConfig(a, configurationWithDeviceIDs)
      verifyDeviceIDSet(a, "a")
    '';
  })