[Starlingx-discuss] [Build] Build Avoidance

[Arce Moreno, Abraham]

Thanks Scott!

> Build Avoidance, a build tool improvement.
> 
>    Greatly reduce build times after a repo sync for designers working within a
> regional office.  For a new workspace, build-pkgs typically requires 3+ hours,
> build avoidance typically reduces this step to ~20min.
> 
> Method (in brief):
> 
> 1) Reference builds

Regional Office could be the results of 2 components:

- Reference Mirror
  - As designer, I do not want to download packages but compile
  - This is already enabled [0] by Jason and team
  - It is being implemented at our office in Mexico, we will send our findings
- Reference Build
  - Described here

> 2) Designers
>    - build-pkgs --build-avoidance   ... will request a build avoidance build.
>    - Additional arguments, and/or environment variables, and/or a config file
> unique to the regional office, are used to specify a URL to the reference
> builds.

Do we need changes at the Build System level? We will run a proof of concept
here just let us know how to get started.

>    - build-pkgs will:
>      = From newest to oldest, scan the CONTEXTs of the various reference
> builds.  Select the first (most recent) context which satisfies:  For every git, the
> SHA specified in the CONTEXT is present.
>      = The selected context might be slightly out of date, but not by more than a
> day (assuming daily reference builds).
>      = If the context has not been previously downloaded, then download it
> now.  Meaning download select portions of the reference build workspace
> into the designer's workspace.  This includes all the SRPMS, RPMS,
> MD5SUMS, and misc supporting files.  (~10 min over office LAN)

Can it take a look at our Reference Mirror?

[0] https://review.openstack.org/590781