$ git clone -n https://src.fedoraproject.org/rpms/erlang-cuttlefish.git /var/lib/mock/f41-build-side-1-2811249-32927/root/chroot_tmpdir/scmroot/erlang-cuttlefish
Cloning into '/var/lib/mock/f41-build-side-1-2811249-32927/root/chroot_tmpdir/scmroot/erlang-cuttlefish'...
$ git fetch origin e29b73e635725c7d6a5d5e464f0677db53e4d951:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-cuttlefish
 * [new ref]         e29b73e635725c7d6a5d5e464f0677db53e4d951 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e29b73e Cosmetic changes