TOOL-13555 disable syncing upstream with zfs master branch

[prakashsurya]

No description provided.

[prakashsurya]

The code is a bit difficult to decipher, but I think with this code change landed to master, it'll disable this job from running: http://ops.jenkins.delphix.com/job/linux-pkg/job/master/job/update-package/job/zfs/

[sebroy]

How does linux-pkg know what upstream repo and branch to sync 6.0/stage from?

[prakashsurya]

How does linux-pkg know what upstream repo and branch to sync 6.0/stage from?

This is only changing the master branch, the 6.0/branch still has this logic.. so when we checkout the 6.0/branch of linux-pkg via Jenkins, to do the sync of upstream-master to downstream-6.0/stage, it'll have this logic..

Additionally, linux-pkg uses the DEFAULT_GIT_BRANCH variable to know which branch to sync upstream into.. on master that's configured to master, and on 6.0/stage that's configured to 6.0/stage.. So, I believe when we move the automation to sync upstream to 6.0/stage, it'll have UPSTREAM_GIT_BRANCH="master" still set (since we won't backport this change), and DEFAULT_GIT_BRANCH="6.0/stage" set..

With all that said, IMO at least, this is all difficult to reason about.. and has strange inter-dependencies between different components and scripts in linux-pkg and the devops-gate.. so honestly, I can't say that I'm sure I understand it all correctly.. but based on my reading so far, this is how I think the Rube Goldberg machine works..