$ git clone -n https://src.fedoraproject.org/rpms/R-repr /var/lib/mock/f41-build-side-1-3148831-40135/root/chroot_tmpdir/scmroot/R-repr
Cloning into '/var/lib/mock/f41-build-side-1-3148831-40135/root/chroot_tmpdir/scmroot/R-repr'...
$ git fetch origin 98688c8aae5e98b3cdcd974e690972ea1c0c831f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-repr
 * [new ref]         98688c8aae5e98b3cdcd974e690972ea1c0c831f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 98688c8 convert GPLv3 license to SPDX