$ git clone -n https://src.fedoraproject.org/rpms/mbpoll.git /var/lib/mock/f45-build-18157-510/root/chroot_tmpdir/scmroot/mbpoll
Cloning into '/var/lib/mock/f45-build-18157-510/root/chroot_tmpdir/scmroot/mbpoll'...
$ git fetch origin 166337926292214f247e6d32fabf060cec706fb3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mbpoll
 * [new ref]         166337926292214f247e6d32fabf060cec706fb3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1663379 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild