nixpkgs/nixos/tests/btrbk-no-timer.nix

import ./make-test-python.nix ({ lib, pkgs, ... }:
  {
    name = "btrbk-no-timer";
    meta.maintainers = with lib.maintainers; [ oxalica ];

    nodes.machine = { ... }: {
      environment.systemPackages = with pkgs; [ btrfs-progs ];
      services.btrbk.instances.local = {
        onCalendar = null;
        settings.volume."/mnt" = {
          snapshot_dir = "btrbk/local";
          subvolume = "to_backup";
        };
      };
    };

    testScript = ''
      start_all()

      # Create btrfs partition at /mnt
      machine.succeed("truncate --size=128M /data_fs")
      machine.succeed("mkfs.btrfs /data_fs")
      machine.succeed("mkdir /mnt")
      machine.succeed("mount /data_fs /mnt")
      machine.succeed("btrfs subvolume create /mnt/to_backup")
      machine.succeed("mkdir -p /mnt/btrbk/local")

      # The service should not have any triggering timer.
      unit = machine.get_unit_info('btrbk-local.service')
      assert "TriggeredBy" not in unit

      # Manually starting the service should still work.
      machine.succeed("echo foo > /mnt/to_backup/bar")
      machine.start_job("btrbk-local.service")
      machine.wait_until_succeeds("cat /mnt/btrbk/local/*/bar | grep foo")
    '';
  })