luatex not loading opentype fonts

[Ken Brown]

On 12/22/2022 2:02 AM, Luis Rivera via Cygwin wrote:
> While developing a package for LuaTeX with the texlive-collection, I
> noticed that LuaTeX could not access the directories for OpenType
> fonts;
> 
> ```
> $ luatex sloth
> This is LuaTeX, Version 1.15.0 (TeX Live 2022/Cygwin)
>   restricted system commands enabled.
> (./sloth.tex (/home/root/.local/share/texmf/tex/luatex/luatex85.sty)
> (/usr/share/texmf-dist/tex/generic/yax/yax.tex
> (/usr/share/texmf-dist/tex/generic/texapi/texapi.tex))
> (/usr/share/texmf-dist/tex/generic/gates/gates.tex
> (/usr/share/texmf-dist/tex/generic/texapi/texapi.tex)) (./lua.ptx) (./files.ptx
> ) (./fonts.ptx./fonts.ptxlua:285: cannot open .:/home/root/.config/texmf/fonts/
> opentype/:/home/root/.cache/texmf/fonts/opentype/:/home/root/.local/share/texmf
> /fonts/opentype/:/usr/share/texmf-site/fonts/opentype/:/etc/texmf/fonts/opentyp
> e/:/var/lib/texmf/fonts/opentype/:/usr/share/texmf-dist/fonts/opentype/:/home/r
> oot/.config/texmf/fonts/truetype/:/home/root/.cache/texmf/fonts/truetype/:/home
> /root/.local/share/texmf/fonts/truetype/:/usr/share/texmf-site/fonts/truetype/:
> /etc/texmf/fonts/truetype/:/var/lib/texmf/fonts/truetype/:/usr/share/texmf-dist
> /fonts/truetype/:/cygdrive/c/windows/fonts/: No such file or directory

I'm not a luatex user, but I find the error message puzzling.  It appears to be 
referring to a colon-separated list of directories as though it were a single 
file or directory name.  Is there something in your package that's preventing 
the colon from being recognized as a separator?  Are you perhaps mixing Cygwin 
and Windows path conventions?

> stack traceback:
>          [C]: in function 'lfs.dir' >          ./fonts.ptxlua:285: in local 'check_fonts'
>          ./fonts.ptxlua:366: in main chunk
>          [C]: in function 'dofile'
>          [\directlua]:1: in main chunk.
> \inputluafile ...ua {dofile(kpse.find_file("#1"))}
> 
> l.1 \inputluafile fonts.ptxlua
> 
> ?
> 
> ```
> 
> Which is weird, because my program works correctly in the windows
> version of TeXLive, and `ls /cygdrive/c/windows/fonts` returns the
> directory listing correctly.

I don't read the error message as referring to that directory alone.

Ken