$ git clone -n https://src.fedoraproject.org/rpms/rsync-bpc.git /var/lib/mock/f45-build-34694-690/root/chroot_tmpdir/scmroot/rsync-bpc
Cloning into '/var/lib/mock/f45-build-34694-690/root/chroot_tmpdir/scmroot/rsync-bpc'...
$ git fetch origin f1461d5ea60e6ac3bd37934220646d92605d681b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rsync-bpc
 * [new ref]         f1461d5ea60e6ac3bd37934220646d92605d681b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f1461d5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild