[Rpm-maint] [rpm-software-management/rpm] How to reset the Lua interpreter state (from Python) (Discussion #3357)

[Miro Hrončok]

Hello. Consider this Python code:

```pycon
>>> import rpm
>>> rpm.expandMacro('%{lua:print(a)}')
'nil'
>>> rpm.expandMacro('%{lua:a = 1}')
''
>>> rpm.expandMacro('%{lua:print(a)}')
'1'
```

Between individual `rpm.expandMacro` calls, the Lua state is preserved. `a` is a global variable and it is set.

In reality, consider parsing a specfile twice from the same process. If the specfile assumes the Lua state is cleared between individual parsings, it [might not work properly](https://github.com/fedora-infra/rpmautospec/issues/185).

I know I can reload the config to achieve what I need:

```pycon
>>> rpm.reloadConfig()
True
>>> rpm.expandMacro('%{lua:print(a)}')
'nil'
```

But I suppose this is IO-bound and it performs a lot of actions that are not necessary for me.

Is there a lighter way to "restart" the Lua interpreter?

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