Use snapshots when building ISO

[Dmitry Teselkin]

fuel-main should use repository snapshots (both CentOS and Ubuntu) when building ISO. It's quite common to get build failed just because repository was updated in the middle of it's mirroring to build slave.

the dereferencing should be a matter of CI side not from make system

[Sergey Kulanov (skulanov)]

Dima, we use snapshots where it's possible in CI jobs, you can also do the same locally by defining
variables like:

https://github.com/openstack/fuel-main/blob/master/config.mk#L222-L223:
MIRROR_MOS_UBUNTU
MIRROR_MOS_UBUNTU_ROOT

https://github.com/openstack/fuel-main/blob/master/config.mk#L234:
MIRROR_FUEL

Please let us know if you have some problems with CI jobs

[Sergey Kulanov (skulanov)]

please also check how this can be done:

https://github.com/fuel-infra/jenkins-jobs/blob/master/servers/jenkins-product-ci/8.0/builders/custom.sh#L73-L82

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/252941

[OpenStack Infra (hudson-openstack)]

Change abandoned by Dmitry Teselkin (<email address hidden>) on branch: master
Review: https://review.openstack.org/252941

[Aleksandra Fedorova (bookwar)]

Dima, Sergey, please update bug status.

[Dmitry Teselkin (teselkin-d)]

After a short discussion with Vladimir Kozhukalov I agree that fuel-main is not the best place for such customization. The reason is quite simple - fuel-main is a kind of ISO 'build system' and should do exactly one thing - build an ISO. There should not be any complicated logic inside that simplifies only special cases, and not universal.

So it looks like the logic to select correct snapshot should be implemented on CI side - either via modifications applied to every build job by means of JJB, or via separate 'wrapper' script that will be used in CI jobs instead of calling fuel-main directly.

If it's already implemented and it works then this bug can be closed.