$ git clone -n https://src.fedoraproject.org/rpms/libburn.git /var/lib/mock/f45-build-15912-480/root/chroot_tmpdir/scmroot/libburn
Cloning into '/var/lib/mock/f45-build-15912-480/root/chroot_tmpdir/scmroot/libburn'...
$ git fetch origin 403cd3199a13ce6e8b3927f638be06a1a16490e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libburn
 * [new ref]         403cd3199a13ce6e8b3927f638be06a1a16490e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 403cd31 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild