$ git clone -n https://src.fedoraproject.org/rpms/sirius.git /var/lib/mock/f45-build-36105-701/root/chroot_tmpdir/scmroot/sirius
Cloning into '/var/lib/mock/f45-build-36105-701/root/chroot_tmpdir/scmroot/sirius'...
$ git fetch origin f0019e0fa9d6d724f69ee30d5810d363ea9ca172:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sirius
 * [new ref]         f0019e0fa9d6d724f69ee30d5810d363ea9ca172 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f0019e0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild