$ git clone -n https://src.fedoraproject.org/rpms/libopenmpt.git /var/lib/mock/f45-build-16686-490/root/chroot_tmpdir/scmroot/libopenmpt
Cloning into '/var/lib/mock/f45-build-16686-490/root/chroot_tmpdir/scmroot/libopenmpt'...
$ git fetch origin bcf86a062c0d9ac699865c42dce79807ada44797:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libopenmpt
 * [new ref]         bcf86a062c0d9ac699865c42dce79807ada44797 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bcf86a0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild