[Rpm-maint] [rpm-software-management/rpm] Run each Lua chunk in an inherited, private environment (#1593)

[Panu Matilainen]

The nil thing is indeed a Lua peculiarity with globals and how the environment is manipulated here, it basically prevents you from (accidentally) doing something nasty to the environment. https://www.lua.org/pil/14.3.html is technically outdated but explains the basic idea.

This patch is originally from last autumn when Lua was still optional, LUA_DISABLED is just a leftover and needs removing.

This also needs more thought than this... closing for now.

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