$ git clone -n https://src.fedoraproject.org/rpms/R-sessioninfo /var/lib/mock/f41-build-side-1-3149108-40244/root/chroot_tmpdir/scmroot/R-sessioninfo
Cloning into '/var/lib/mock/f41-build-side-1-3149108-40244/root/chroot_tmpdir/scmroot/R-sessioninfo'...
$ git fetch origin f18ab005cf03372c76343e7eaf041a3d647cf89a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-sessioninfo
 * [new ref]         f18ab005cf03372c76343e7eaf041a3d647cf89a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f18ab00 convert GPLv2 license to SPDX