$ git clone -n https://src.fedoraproject.org/rpms/R-jqr.git /var/lib/mock/f40-build-789473-135730/root/chroot_tmpdir/scmroot/R-jqr
Cloning into '/var/lib/mock/f40-build-789473-135730/root/chroot_tmpdir/scmroot/R-jqr'...
$ git fetch origin ee0d32df3ee5fd26b69e20c1a9d00a23f3d209f8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-jqr
 * [new ref]         ee0d32df3ee5fd26b69e20c1a9d00a23f3d209f8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ee0d32d Update to latest version (#2239938)