luatex problem with file with umlauts on windows 10

[Philip Taylor]

Ulrike Fischer wrote:

> After removing the two comments (--) it works fine, both in miktex and texlive.

Also for me (in TeX Live only) but the console-log output is distinctly sub-optimal in TeXworks when reporting the file name from within LuaTeX at */print ("\string \n FILE: ", file)/* :

> This is LuaTeX, Version 1.12.0 (TeX Live 2020/W32TeX)
>
> restricted system commands enabled.
>
> (./untitled-4.tex (./grüße.tex)
>
> FILE: ./gr��e.tex
>
> SIZE: 11
>
> isfile true
>
> [1{c:/TeX/Live/2020/TeX-MF/Var/fonts/map/pdftex/updmap/pdftex.map}])
>
> (see the transcript file for additional information)
> <c:/TeX/Live/2020/texmf-dist/fonts/type1/public/amsfonts/cm/cmr10.pfb>
>
> Output written on untitled-4.pdf (1 page, 11393 bytes).
>
>
> SyncTeX written on untitled-4.synctex.gz.
>
> Transcript written on untitled-4.log.
>

TeXworks and LuaTeX lists cc'd, source follows :

% UTF-8
\directlua
     {
         local function is_texlive ()
              local a = kpse.var_value ('command_line_encoding')
              if a
              then
                    return true
              else
                    return false
              end
         end
         local function is_windows ()
              local a = package.config:sub (1,1)
              if a == '/'
              then
                    return false
              elseif a == ':'
                 then
                        return false
                  else
                        return true
              end
         end
         function myfilesize (name)
              local file =  kpse.find_file (name, "tex", true)
              if is_windows () and is_texlive ()
              then
                    local g = chgstrcp.utf8tosyscp (file)
                    file = g
              end
              print ("\string \n FILE: ", file)
              if file
              then
                    local size = lfs.attributes (file, "size")
                    local isfile= lfs.isfile (file)
                    print ("SIZE: ", size)
                    print ("isfile ", isfile)
              end
         end
     }

\input {grüße}
\directlua {myfilesize ("grüße.tex")}

\end
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