$ git clone -n https://src.fedoraproject.org/rpms/fossil.git /var/lib/mock/f45-build-9182-399/root/chroot_tmpdir/scmroot/fossil
Cloning into '/var/lib/mock/f45-build-9182-399/root/chroot_tmpdir/scmroot/fossil'...
$ git fetch origin 3e8846ebff64c8468ee5ab7264da3d209154fd48:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fossil
 * [new ref]         3e8846ebff64c8468ee5ab7264da3d209154fd48 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e8846e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild