$ git clone -n https://src.fedoraproject.org/rpms/R-downlit.git /var/lib/mock/f40-build-1930454-25111/root/chroot_tmpdir/scmroot/R-downlit
Cloning into '/var/lib/mock/f40-build-1930454-25111/root/chroot_tmpdir/scmroot/R-downlit'...
$ git fetch origin 98cacc2d40c036c11ee7172c8f2969f70c6a7f31:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-downlit
 * [new ref]         98cacc2d40c036c11ee7172c8f2969f70c6a7f31 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 98cacc2 R-maint-sig mass rebuild