Re: A major problem with the Lua ecosystem

[Dibyendu Majumdar <mobile@...>]

Hi Sean,

On 1 February 2018 at 23:22, Sean Conner <sean@conman.org> wrote:
> my syslog module [1] is a
> C-based module.  When you do:
>
>         local syslog = require "org.conman.syslog"
>
> Lua will replace the dots with the file separator (in my case '/'):
>
>         org/conman/syslog
>
> and for each component in package.cpath (broken out for easier reading):
>
>         /home/spc/.luarocks/lib/lua/5.1/?.so
>         ./?.so
>         /usr/local/lib/lua/5.1/?.so
>         /usr/local/lib/lua/5.1/loadall.so
>
> will replace the '?' with the modified module name:
>
>         /home/spc/.luarocks/lib/lua/5.1/org/conman/syslog.so
>         ./org/conman/syslog.so
>         /usr/local/lib/lua/5.1/org/conman/syslog.so
>         /usr/local/lib/lua/5.1/loadall.so
>
> and will attempt to load each .so file in turn.  Further more, to illustrate
> a potentinal problem, I installed org.conman.syslog twice, once manually and
> once via LuaRocks.
>
>         [spc]lucy:~>luawhich org.conman.syslog # [2]
>         /home/spc/.luarocks/lib/lua/5.1/org/conman/syslog.so
>         /usr/local/lib/lua/5.1/org/conman/syslog.so
>
>   In this case, Lua will load "/home/spc/.luarocks/lib/lua/5.1/org/conman/syslog.so" since it is found
> first by Lua.
>

Thank you for this example. I will use this model - I suppose if the
libraries did not depend on each other other than via Lua, then it
should work fine.
I think the mechanism is described in the Lua manual in a brief way so
I never really "saw" it.

Regards
Dibyendu