Buildbot no longer supports Python 2.7 on the Buildbot master.
GitHub step is exactly like the
Git step, except that it will ignore the revision sent by
GitHub change hook, and rather take the branch if the branch ends with /merge.
This allows to test github pull requests merged directly into the mainline.
GitHub indeed provides
refs/origin/pull/NNN/merge on top of
refs/origin/pull/NNN/head which is a magic ref that always create a merge commit to the latest version of the mainline (i.e. the target branch for the pull request).
The revision in the GitHub event points to
/head is important for the GitHub reporter as this is the revision that will be tagged with a CI status when the build is finished.
If you want to use
Trigger to create sub tests and want to have the GitHub reporter still update the original revision, make sure you set
updateSourceStamp=False in the