$ git clone -n https://src.fedoraproject.org/rpms/libspng.git /var/lib/mock/f45-build-17029-495/root/chroot_tmpdir/scmroot/libspng
Cloning into '/var/lib/mock/f45-build-17029-495/root/chroot_tmpdir/scmroot/libspng'...
$ git fetch origin 8be5fbdd06abecc4d57b1a5e3ba9ee79ea0c7962:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libspng
 * [new ref]         8be5fbdd06abecc4d57b1a5e3ba9ee79ea0c7962 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8be5fbd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild