Multiple version of Lua with alternatives

[Lemures Lemniscati]

On Wed, 24 Feb 2021 09:38:33 -0700, Brian Inglis
> On 2021-02-24 04:03, Lemures Lemniscati via Cygwin-apps wrote:
> > On Tue, 23 Feb 2021 23:53:08 -0700, Brian Inglis
> >> On 2021-02-23 22:20, Marco Atzeri via Cygwin-apps wrote:
> >>> On 24.02.2021 05:18, Lemures Lemniscati via Cygwin-apps wrote:
> >>>> On Sat, 20 Feb 2021 19:15:38 +0900, Lemures Lemniscati
> >>>>> On Sat, 20 Feb 2021 08:40:33 +0100, Achim Gratz
> >>>>>> Lemures Lemniscati via Cygwin-apps writes:
> >>>>>>> * A new source luarocks provides lua53- and lua54-luarocks.
> >>>>>>>     They install rocks into an alternative tree /var/lib/lua-site/.
> 
> >>>>>> That looks wrong to me, I'd have expected
> >>>>>> /usr/share/lua/luarocks
> >>>>>> or maybe /usr/local as a prefix depending on how much emphasis you want
> >>>>>> to put on the user-installable part.  The /var/lib tree is for local
> >>>>>> state information per FHS, not installed components.
> 
> >>>>> Thank you for review.
> >>>>> I've fixed it, so that luarocks should install rocks into
> >>>>> /usr/share/lua/luarocks, and updated packages [1].
> >      ^^^^^^^^^ (Sorry I accidentally replaced it by '/usr/local' in the
> >                 original mail: it is still /usr/share/lua/luarocks )
> >>>> I'm wondering again it would be better for luarock to install into /usr/local
> >>>> tree.
> 
> >>> usually installation with a similar subtree are installed
> >>> under usr/lib
> >>> $ find /usr/lib -name bin
> 
> >>> there are few cases under usr/share
> >>> but usually are sub-sub trees
> >>> $ find /usr/share -name bin
> 
> >>> we have nothing "current" installed under usr/local
> >>> at all. No package should be installed there
> 
> >> Indeed - that's where I stash all my personal Cygwin scripts and exes.
> 
> >> Another good spot is /usr/libexec/ which is well populated by the likes of
> >> git plumbing and other packages. I prefer the packages that populate
> >> subdirectories rather than littering the top level like geoclue and gvfsd.
> 
> > Thank you for advices!
> > I've understood that we should avoid /usr/local.
> > And, choices for a tree-prefix where luarocks will install rocks are:
> > 1) luarocks_tree=/usr/share/lua/luarocks
> > 2) luarocks_tree=/usr/lib/lua/luarocks
> > 3) luarocks_tree=/usr/libexec/lua/luarocks
> > And rocks will go:
> > ${luarocks_tree}/bin
> > ${luarocks_tree}/lib/lua/5.3
> > ${luarocks_tree}/lib/lua/5.4
> > ${luarocks_tree}/lib/luarocks/rocks-5.3/
> > ${luarocks_tree}/lib/luarocks/rocks-5.4/
> > ${luarocks_tree}/share/lua/5.3
> > ${luarocks_tree}/share/lua/5.4
> > I don't know which is the best.
> > Current choice is still /usr/share/lua/luarocks [1].
> > [1]: https://cygwin-lem.github.io/lua-cygwin-packages/
> 
> Packaging luarocks varies across distros. Where I have been able to find target directories suggests:
> 
> basing off Fedora as much here does:
> https://src.fedoraproject.org/rpms/luarocks/blob/rawhide/f/luarocks.spec#_57:
> 	mkdir -p %{buildroot}%{_prefix}/lib/luarocks/rocks-%{lua_version}
> would suggest /usr/lib/luarocks/rocks-%{lua_version}
> 
> msys2 uses:
> https://github.com/msys2/MINGW-packages/blob/fbe23378fcb1fa50dcd132ce8ab24217a6d9e433/mingw-w64-lua-luarocks/luarocks-x86_64.install#L8
> 	${MINGW_PREFIX}/share/lua/5.1/luarocks/site_config.lua
> 	/usr/share/lua/$VER/luarocks/
> 
> Arch uses:
> 	https://archlinux.org/packages/community/any/luarocks/
> 	usr/share/lua/$VER/luarocks/
> 
> slack uses:
> https://slackbuilds.org/slackbuilds/14.2/development/luarocks/luarocks.SlackBuild#77
> suggests /usr/lib{,64}/ and whatever make install defaults to.
> 
> Ubuntu uses:
> 	https://packages.ubuntu.com/groovy/all/luarocks/filelist
> 	/usr/share/lua/$VER/luarocks/

Thank you.

Their places for luarocks package itself seem to be almost default
with prefix /usr.


I've tested luarocks on fedora/opensuse/debian/ubuntu to find out places
in which luarocks install rocks and libraries [1].

[1]: https://gitlab.com/test.cases/luarocks-test/-/pipelines/262667066


fedora:  using /usr tree
 https://gitlab.com/test.cases/luarocks-test/-/jobs/1060115707
 https://gitlab.com/test.cases/luarocks-test/-/jobs/1060115708
  /usr/bin/
  /usr/lib64/luarocks/rocks-5.4/
  /usr/lib/lua/5.4/
  /usr/share/lua/5.4/

opensuse:  using /usr tree
 https://gitlab.com/test.cases/luarocks-test/-/jobs/1060115709
  /usr/bin/
  /usr/lib64/lua/5.3/
  /usr/lib/luarocks/rocks-5.3/
  /usr/share/lua/5.3/

debian/ubuntu:  using /usr/local tree
 https://gitlab.com/test.cases/luarocks-test/-/jobs/1060115705
 https://gitlab.com/test.cases/luarocks-test/-/jobs/1060115706
 https://gitlab.com/test.cases/luarocks-test/-/jobs/1060115710
  /usr/local/bin/
  /usr/local/lib/luarocks/rocks/
  /usr/local/lib/lua/5.1/
  /usr/local/share/lua/5.1/

Lem