buildbot/buildbot — comment on commit f1c1361ca4c723120075c0d902acaff8320429ec
File: master/docs/manual/cfg-buildsteps.rst line 213
By tomprince:

Why is WithPropeties better than Propety?

Your solution works, if you can garuntee that the repo is on the same server. I have projects where the primary repo is on sourceforge, but there are a number of repos on github as well.