{ pkgs, lib, ... }:

{
  name = "incron";
  meta.maintainers = [ lib.maintainers.aanderse ];

  nodes.machine =
    { ... }:
    {
      services.incron.enable = true;
      services.incron.extraPackages = [ pkgs.coreutils ];
      services.incron.systab = ''
        /test IN_CREATE,IN_MODIFY,IN_CLOSE_WRITE,IN_MOVED_FROM,IN_MOVED_TO echo "$@/$# $%" >> /root/incron.log
      '';

      # ensure the directory to be monitored exists before incron is started
      systemd.tmpfiles.settings.incron-test = {
        "/test".d = { };
      };
    };

  testScript = ''
    start_all()

    machine.wait_for_unit("multi-user.target")
    machine.wait_for_unit("incron.service")

    machine.succeed("test -d /test")
    # create some activity for incron to monitor
    machine.succeed("touch /test/file")
    machine.succeed("echo foo >> /test/file")
    machine.succeed("mv /test/file /root")
    machine.succeed("mv /root/file /test")

    machine.sleep(1)

    # touch /test/file
    machine.succeed("grep '/test/file IN_CREATE' /root/incron.log")

    # echo foo >> /test/file
    machine.succeed("grep '/test/file IN_MODIFY' /root/incron.log")
    machine.succeed("grep '/test/file IN_CLOSE_WRITE' /root/incron.log")

    # mv /test/file /root
    machine.succeed("grep '/test/file IN_MOVED_FROM' /root/incron.log")

    # mv /root/file /test
    machine.succeed("grep '/test/file IN_MOVED_TO' /root/incron.log")

    # ensure something unexpected is not present
    machine.fail("grep 'IN_OPEN' /root/incron.log")
  '';
}
