[Rpm-maint] [rpm-software-management/rpm] Accessing macro parameter from lua fails with "attempt to index a nil value (global 'opt')" (Issue #2446)

[Ralf Habacker]

The documentation at https://github.com/rpm-software-management/rpm/blob/master/docs/manual/lua.md mentions how to get macro options as

``` 
%foo(a:b) %{lua:
if opt.b then
...
```

but this does not work on openSUSE Leap 15.4 with rpm with version:
```
rpm --version
RPM version 4.14.3
```
Running such a macro returns this error:
```
error: lua script failed: [string "<lua>"]:2: attempt to index a nil value (global 'opt')
```

# How to reproduce
1. Paste the following macro, mentioned in the documentation, into a file:
```
cat << EOF > test.macros
%foo(a:b) %{lua:
if opt.b then
   print('do b')
else
   print('or not')
end
if opt.a == 's' then
   print('do s')
end
if #arg == 0 then
   print('no arguments :(')
else
   for i = 1, #arg do
      print(arg[i])
   end
end
}
EOF
```
2. then run 
```
$ rpm --eval='%{load:test.macros} %foo -axxx=yyy -b  dsdsd'
error: lua script failed: [string "<lua>"]:2: attempt to index a nil value (global 'opt')
```

-- 
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