$ git clone -n https://src.fedoraproject.org/rpms/python-billiard.git /var/lib/mock/f45-build-29977-642/root/chroot_tmpdir/scmroot/python-billiard
Cloning into '/var/lib/mock/f45-build-29977-642/root/chroot_tmpdir/scmroot/python-billiard'...
$ git fetch origin 17d6277b1e726b2f2fc6ab41a558d69015e6e57c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-billiard
 * [new ref]         17d6277b1e726b2f2fc6ab41a558d69015e6e57c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 17d6277 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild