$ git clone -n https://src.fedoraproject.org/rpms/rpy.git /var/lib/mock/f41-build-side-1-2741804-30931/root/chroot_tmpdir/scmroot/rpy
Cloning into '/var/lib/mock/f41-build-side-1-2741804-30931/root/chroot_tmpdir/scmroot/rpy'...
$ git fetch origin 098903b24891435b562dc976ff1460a9fa95699b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpy
 * [new ref]         098903b24891435b562dc976ff1460a9fa95699b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 098903b fix changelog date