package_config with boolean AND between classes (instead of OR)

[Maximilian Wilhelm]

Michael Tautschnig scripsit:

Hi!

> > could we introduce a boolean AND between classes in package_config
> > files?

> I think you're not the first bringing up this issue, but the first one providing
> a solution as well :-) IMHO, this would indeed be very useful, but ...

> [...]

> > Maybe it's better to use a complete set of boolean expressions: &, |, !, ()
> > But I could already work with this "AND-patch". ;)

> ... I think we should really discuss how far we should go. Your patch
> essentially
> - introduces NOT
> - changes the semantics of the list in that it is now AND and not OR anymore

> If we really like to see OR and (), this will require at least a larger chunk of
> code, first for parsing the statement and then something to interpret it. Yet,
> people might be already happy seeing NOT integrated (which includes myself).

> What do others think about this issue? Do we need OR and ()? Please be aware
> that OR may be implemented by several PACKAGES install lines as well. I'd opt
> for integrating Jürgen's patch, even though the change in semantics must be well
> documented.

I wrote something which does this for some internal applikation which
uses FAI_CLASSES to decide which things to do.

The tool read /etc/fai/FAI_CLASSES and checks where the expr specified
as cmdline parameter matches for these classes.

See the perl script attached.

Ciao
Max
-- 
	Follow the white penguin.
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