anchor.diff:          start script
           cat > /etc/vsftpd.conf <<EOF
           ${yesNoOption anonymousUser "anonymous_enable"}
  +        ${yesNoOption localUsers "local_enable"}
           ${yesNoOption writeEnable "write_enable"}
           ${yesNoOption anonymousUploadEnable "anon_upload_enable"}
           ${yesNoOption anonymousMkdirEnable "anon_mkdir_write_enable"}
  
positive.code:           default = false;
            description = "
              Whether to enable the anonymous FTP user.
            ";
          };
  
  
negative.code: 
  let 
  
    inherit (config.services.vsftpd) anonymousUser localUsers writeEnable anonymousUploadEnable anonymousMkdirEnable;
    inherit (pkgs) vsftpd;
  
    yesNoOption = p : name :
  