The git repository stores only the packaging related items (the specfile, the custom patches, etc.). The actual source is stored as a binary artifact that is downloaded by a `get_sources.sh` script.
That did it, thanks. From a cursory glance, it looks like it fetches indeed the RHEL (rather than CentOS) sources. It looks like the mains questions for the clone builders will be how RH is going to provide RHEL code drops for their point releases (and updates) in the future. Since right now there are separate 8 and Stream branches, but presumably the 8 will be discontinued at some point?
The build process is documented here: https://wiki.centos.org/action/show/Sources?action=show&redi...