RFE: useful lua errors

[nim-nim]

Right now rpm prints out lua syntax errors with line numbers, but forgets to print the macro in which those lines can be found

When several lua macros call each other finding the one which is erroring becomes quite tricky. rpm only points out the top macro name

For example

%luamacro() %{lua:
-- lots of processing
print( rpm.expand("%anotherluamacro") .. "\\n")

rpm will notify there is an error in %luamacro if %anotherluamacro has a syntax error, instead of notifying the error is in line x of %anotherluamacro

[pavlinamv]

Agree. The error message does not help a lot. Some additional info containing whole %anotherluamacro can improve the situation.

[pmatilai]

The top macro name you're seeing is simply the line in the spec. Try --trace (or in older versions that don't support it, --eval '%trace') for more advanced macro debugging.

[nim-nim]

Thanks for the pointer!

However that does not help a lot when you are mass building in mock (the general case nowadays), and the only debugging help are mock logs, and mock has already cleaned up all rpm temporary files

[pmatilai]

Nod. Makes me think that perhaps we should default to macro tracing on when building packages, at least in non-quiet mode.

[pmatilai]

This is broader than just Lua, rpm should really print out a "traceback" on macro errors. There's even some code to do that but I guess its not working as it should (shock horror)