We updated python-base and python-builder to include arm64 images in
support of nodepool's arm64 python-builder image. In doing so we have
discovered a number of issues, but the biggest is slowness of building
python packages in an emulated environment.
In order to speed up package builds we consume the OpenDev linaro
cloud arm64 wheel cache. This doesn't have wheels for every package we
need, but for the things that it does have it will speed up our builds.
One of the risks with this setup is that we're relying on wheels built
for openstack on arm64 and those follow openstack's contraints. In order
to mitigate this risk we set pip install's --prefer-binary flag in the
pip.conf. This means that if openstack's constraints lag what is
availale on pypi we should use the existing wheels as long as they are
valid version according to requirements rather than trying to build from
sdist.
Co-Authored-By: James E. Blair <corvus@inaugust.com>
Co-Authored-By: Ian Wienand <iwienand@redhat.com>
Change-Id: I3b358721eebbceafc12daf9d706306634048b196
ed42e5535b