$ git clone -n https://src.fedoraproject.org/rpms/libserf.git /var/lib/mock/f45-build-16963-494/root/chroot_tmpdir/scmroot/libserf
Cloning into '/var/lib/mock/f45-build-16963-494/root/chroot_tmpdir/scmroot/libserf'...
$ git fetch origin 82184303990717477e557d5ec6dd6ddbab0706c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libserf
 * [new ref]         82184303990717477e557d5ec6dd6ddbab0706c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8218430 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild