nixpkgs/nixos/tests/systemd-timesyncd.nix

# Regression test for systemd-timesync having moved the state directory without
# upstream providing a migration path. https://github.com/systemd/systemd/issues/12131

import ./make-test-python.nix (
  let
    common =
      { lib, ... }:
      {
        # override the `false` value from the qemu-vm base profile
        services.timesyncd.enable = lib.mkForce true;
      };
    mkVM = conf: {
      imports = [
        conf
        common
      ];
    };
  in
  {
    name = "systemd-timesyncd";
    nodes = {
      current = mkVM { };
      pre1909 = mkVM (
        { lib, ... }:
        {
          # create the path that should be migrated by our activation script when
          # upgrading to a newer nixos version
          system.stateVersion = "19.03";
          systemd.tmpfiles.settings.systemd-timesyncd-test = {
            "/var/lib/systemd/timesync".R = { };
            "/var/lib/systemd/timesync".L.argument = "/var/lib/private/systemd/timesync";
            "/var/lib/private/systemd/timesync".d = {
              user = "systemd-timesync";
              group = "systemd-timesync";
            };
          };
        }
      );
    };

    testScript = ''
      start_all()
      current.succeed("systemctl status systemd-timesyncd.service")
      # on a new install with a recent systemd there should not be any
      # leftovers from the dynamic user mess
      current.succeed("test -e /var/lib/systemd/timesync")
      current.succeed("test ! -L /var/lib/systemd/timesync")

      # timesyncd should be running on the upgrading system since we fixed the
      # file bits in the activation script
      pre1909.succeed("systemctl status systemd-timesyncd.service")

      # the path should be gone after the migration
      pre1909.succeed("test ! -e /var/lib/private/systemd/timesync")

      # and the new path should no longer be a symlink
      pre1909.succeed("test -e /var/lib/systemd/timesync")
      pre1909.succeed("test ! -L /var/lib/systemd/timesync")

      # after a restart things should still work and not fail in the activation
      # scripts and cause the boot to fail..
      pre1909.shutdown()
      pre1909.start()
      pre1909.succeed("systemctl status systemd-timesyncd.service")
    '';
  }
)