def add_architecture(distroseries, architecture_name):
"""Add a DistroArchSeries for the given architecture to `distroseries`."""
# Avoid circular import.
from lp.soyuz.model.distroarchseries import DistroArchSeries
processor = getUtility(IProcessorSet).getByName(architecture_name)
archseries = DistroArchSeries(
distroseries=distroseries, processor=processor,
owner=distroseries.owner, official=True,
architecturetag=architecture_name)
IMasterStore(DistroArchSeries).add(archseries)
