Am 13.05.2011 um 12:57 schrieb Paul Isambert:
> LaTeX doesn't rely on pdfTeX anyway, so it shouldn't allow filenames with spaces and the behavior in LuaTeX shouldn't be troublesome.
Maybe that's indeed the simplest solution:
\def\document{
\endgroup
\IfJobnameContainsSpaces
\errmessage{Don't to this}
\endinput\fi
...
}