System queries with Lua: l3sys-query

[David Carlisle]

If openin_any = p is in force the calling tex system wouldn't be able to
> read .foo but (currently at least)  it shows in the directory listing.

I think that's compatible with openin_any=p (which actually is in force
above) otherwise we would (I think) have to add a call to

kpsewhich -var-value 'openin_any'

to disable --all in that case.


or using the lua interface rather than calling the command

 kpse.set_program_name("kpsewhich")
  if (kpse.var_value('open_in') ~= 'a')
  then
     is_all=false
  end

>
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