On Wed, 18 Mar 2009, Loïc Minier wrote:
> If you implement conditional behavior in your rules, typically based on
> lsb_release -is output:
> if vendor is Ubuntu:
> foo
> elif vendor is Debian:
> bar
> you face a problem when you meet:
> else:
>
> What behavior should one use here?
Debian should always be the "else" because it's the default case. It
ensures that the lack of DEB_VENDOR results in correct package and
also that any unknown derivatives get the Debian behaviour.
Of course an Ubuntu derivative could be surprised if they get
a Debian-variant of a package instead of an Ubuntu-variant… this explains
your other remark:
> Instead, I think it would be nice if we could express some inheritance
> concept so that you can have conditional behavior in rules based on
> either "this distribution and its derivatives" or "only for this exact
> distribution" and logical combinations such as "derivatives of Foo
> except derivatives of Bar".
I see how we can solve it (add new fields in /etc/dpkg/origins/* to
describe parent relationship, and create a new tool to query those
meta-information) but I wonder what impact you expect it would have
on the decision of exporting DEB_VENDOR in the build environment.
Would you like a DEB_VENDORS="Gobuntu Ubuntu Debian" or similar
so that no external tool is required ?
ifneq (,$(filter Ubuntu,$(DEB_VENDORS)))
# Ubuntu or derivative
endif
Cheers,
--
Raphaël Hertzog
Contribuez à Debian et gagnez un cahier de l'admin Debian Lenny :
http://www.ouaza.com/wp/2009/03/02/contribuer-a-debian-gagner-un-livre/
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