$ git clone -n https://src.fedoraproject.org/rpms/pf-bb-config.git /var/lib/mock/f45-build-27855-626/root/chroot_tmpdir/scmroot/pf-bb-config
Cloning into '/var/lib/mock/f45-build-27855-626/root/chroot_tmpdir/scmroot/pf-bb-config'...
$ git fetch origin 487d9a496548cf9609aa2fffd17c0979edfaaa79:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pf-bb-config
 * [new ref]         487d9a496548cf9609aa2fffd17c0979edfaaa79 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 487d9a4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild