clear-scratch.nix

{
  fileSystems."/scratch" = { fsType = "zfs"; device = "ordnungsamd/scratch"; };
  systemd.services.clear-scratch = {
    script = ''
      /run/booted-system/sw/bin/zfs rollback ordnungsamd/scratch@empty
      # dropbox is exposed write-only via samba to allow transferring files to my laptop from windows machines
      install -dm0700 -o linus /scratch/dropbox
      setfacl -m u:dropper:wx /scratch/dropbox
    '';
    path = [ pkgs.acl ];
  };
  systemd.timers.clear-scratch = {
    timerConfig.OnCalendar = "03:00";
    timerConfig.Persistent = true;
    wantedBy = ["multi-user.target"];
  };
}