PPA & ogre-model combination causes unnecessary extra work

[Matthias Klose]

see https://launchpad.net/~ubuntu-toolchain/+archive/+build/382957

libxul-dev is available in universe, why isn't the package built? or was gcc-4.3 moved implicitly to main?

[Celso Providelo (cprov)]

Well, gcc-4.3 is in main in your PPA (it wasn't overridden as in ubuntu as you'd expect), thus ogre-model forced builder to only look for build-deps in 'main' component.

[Matthias Klose (doko)]

please consider to reopen this report; it's odd, we do see build failures because of component mismatches. why hide them? a user doesn't expect that the debian pocket is the relevant one.

[Celso Providelo (cprov)]

Ok, you are right, I've modified the summary to make clear that there is no "wrong error", but instead, a side-effect caused by the enforcement of ogre-model in the PPA scope where we do not have the ability to perform [auto-]overrides.

[Christian Reis (kiko)]

I am in favor of making pockets and components irrelevant for PPAs, and updating the ogre code accordingly.

[Mark Shuttleworth (sabdfl)]

Just so I can follow this discussion better, what is the ogre code?

[Celso Providelo (cprov)]

Ok, 'ogre-model' is a rule that tells the builder to lookup for build-dependencies only in the target source component or lowers, as in the chart below:

{{{
|| target component || build-dep lookup ||
|| main || main ||
|| restricted || main, restricted ||
|| universe || main, restricted, universe ||
|| multiverse || main, restricted, universe, multiverse ||
|| partner || main, restricted, partner ||
}}}

It is a pretty valid mechanism in primary archive because it ensure that components are self-sustained, i.e., they can be rebuilt without depending on unknown binaries.

Although, the whole discussion is if this mechanism is valid for PPAs, where users don't have easy control of package-overrides.

We could simply avoid ogre-model enforcement on PPA build, but sooner or later it would bite us, specially if we copying/syncing the source to ubuntu primary archive.

[William Grant (wgrant)]

I think the best idea would be to actually have overrides for PPAs, and have them default to the Ubuntu ones... but I presume there's a reason for not having them.

[Celso Providelo (cprov)]

RF 5088