problem(s) with extractbb and extractbb.lua recently introduced

[Bruno Voisin]

Having installed MacTeX-2024 on an Intel Mac (from 2013) with macOS 10.15 Catalina, then updated all the packages with TeX Live Utility, I could test the two configurations (macOS 10.15 Intel, macOS 15 ARM, MacTeX-2024 on both) in parallel.

Unfortunately I don't have a current Intel Mac at hand, on which the latest macOS could be installed so the comparison would be more relevant.

With the current script, in which the lines

	if (script_dir ~= interpreter_dir) and (script_path ~= resolved_script_path) then
	    error("The script is in an incorrect location: " .. script_dir)
	end

commented out by Karl, have been uncommented, I get the same on both ARM and Intel:

	% extractbb --version
	! ERROR (extractbb.lua): The script is in an incorrect location: /Library/TeX/texbin
	stack traceback:
	/Library/TeX/texbin/extractbb:191: in main chunk

Taking Max's updated script, I get on ARM

	% extractbb --version
	
	The ffi module is available for:
	
	    archictures       : ARCH_X86 and ARCH_X64,
	    operating systems : OS_CE, OS_WIN, OS_LINUX, OS_BSD and OS_POSIX
	
	The ARM processor is currently not supported. There are subtle
	differences between this module and the one in luajitTeX  and we hope to be in sync around TeXLive 2022.
	Different OS can have different interfaces,
	for instance OS_WIN has not 'complex.h'. If you want portable
	code, stick to the most common concepts.
	! extractbb ERROR: The script is in an incorrect location.
	
	Technical Details:
	exec_script_name: (string) extractbb
	exec_script_path: (string) /Library/TeX/texbin/extractbb
	os_type: (string) unix
	resolve_script_path: (string) /Library/TeX/texbin/extractbb
	resolve_interpreter_dir: (string) /usr/local/texlive/2024/bin/universal-darwin
	resolve_script_name: (string) extractbb
	exec_interpreter_name: (string) texlua
	exec_script_dir: (string) /Library/TeX/texbin
	resolve_interpreter_name: (string) texlua
	exec_interpreter_dir: (string) /usr/local/texlive/2024/bin/universal-darwin
	resolve_script_dir: (string) /Library/TeX/texbin
	kpse_script_path: (string) /usr/local/texlive/2024/texmf-dist/scripts/texlive/extractbb.lua

	stack traceback:
	/Library/TeX/texbin/extractbb:320: in main chunk

and on Intel

	% extractbb --version                                      
	(Wrapped by extractbb.lua $Revision: $.)
	
	This is extractbb Version 20240407
	
	Copyright (C) 2008-2024 by Jin-Hwan Cho and Matthias Franz
	
	This is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

Finally, using extractbb to actually do its work, based on Reinhard's test from yesterday (with <https://www.gust.org.pl/bachotex/bachotex-promo/bachotex-site-color.png>, which downloads to file name final-color.png):

- On ARM Mac:

	% extractbb -O final-color.png

	The ffi module is available for:

	    archictures       : ARCH_X86 and ARCH_X64,
	    operating systems : OS_CE, OS_WIN, OS_LINUX, OS_BSD and OS_POSIX

	The ARM processor is currently not supported. There are subtle
	differences between this module and the one in luajitTeX  and we hope to be in sync around TeXLive 2022.
	Different OS can have different interfaces,
	for instance OS_WIN has not 'complex.h'. If you want portable
	code, stick to the most common concepts.
	! extractbb ERROR: The script is in an incorrect location.

	Technical Details:
	os_type: (string) unix
	resolve_interpreter_name: (string) texlua
	resolve_interpreter_dir: (string) /usr/local/texlive/2024/bin/universal-darwin
	exec_interpreter_dir: (string) /usr/local/texlive/2024/bin/universal-darwin
	resolve_script_dir: (string) /Library/TeX/texbin
	resolve_script_path: (string) /Library/TeX/texbin/extractbb
	exec_script_name: (string) extractbb
	exec_script_path: (string) /Library/TeX/texbin/extractbb
	exec_interpreter_name: (string) texlua
	kpse_script_path: (string) /usr/local/texlive/2024/texmf-dist/scripts/texlive/extractbb.lua
	resolve_script_name: (string) extractbb
	exec_script_dir: (string) /Library/TeX/texbin

	stack traceback:
	/Library/TeX/texbin/extractbb:320: in main chunk

- On Intel Mac:

	% extractbb -O final-color.png
	%%Title: final-color.png
	%%Creator: extractbb 20240407
	%%BoundingBox: 0 0 754 571
	%%HiResBoundingBox: 0.000000 0.000000 754.201508 570.841142
	%%CreationDate: Tue Jul 16 23:21:23 2024

What's a bit worrying, apart from the problem with extractbb itself, is that this reveals luatex is built with the library luaffi

	https://tug.org/svn/texlive/trunk/Build/source/texk/web2c/luatexdir/luaffi/

from

	https://github.com/facebookarchive/luaffifb

This library (1) doesn't support ARM processors and (2) has been archived on 13 January 2022 and is now unmaintained.

Bruno