$ git clone -n https://src.fedoraproject.org/rpms/R-rlecuyer.git /var/lib/mock/f42-build-side-110318-58926300-6569309/root/chroot_tmpdir/scmroot/R-rlecuyer
Cloning into '/var/lib/mock/f42-build-side-110318-58926300-6569309/root/chroot_tmpdir/scmroot/R-rlecuyer'...
$ git fetch origin 590cac48b366482e1bd4490f8c86c54e3d47d261:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-rlecuyer
 * [new ref]         590cac48b366482e1bd4490f8c86c54e3d47d261 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 590cac4 Merge branch 'epel8' into rawhide