$ git clone -n https://src.fedoraproject.org/rpms/erlang-rebar3.git /var/lib/mock/f40-build-1777682-24803/root/chroot_tmpdir/scmroot/erlang-rebar3
Cloning into '/var/lib/mock/f40-build-1777682-24803/root/chroot_tmpdir/scmroot/erlang-rebar3'...
$ git fetch origin ffbf04d219f8d61471eaf5c1aed17266af2805e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-rebar3
 * [new ref]         ffbf04d219f8d61471eaf5c1aed17266af2805e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ffbf04d Update to rebar3 3.23.0