$ git clone -n https://src.fedoraproject.org/rpms/R-Bessel.git /var/lib/mock/f45-build-5892-345/root/chroot_tmpdir/scmroot/R-Bessel
Cloning into '/var/lib/mock/f45-build-5892-345/root/chroot_tmpdir/scmroot/R-Bessel'...
$ git fetch origin 0353b3d729140a52b0cf999f53ffbb9b3c3a81d9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-Bessel
 * [new ref]         0353b3d729140a52b0cf999f53ffbb9b3c3a81d9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0353b3d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild