$ git clone -n https://src.fedoraproject.org/rpms/erlang-hamcrest.git /var/lib/mock/f41-build-873412-16165/root/chroot_tmpdir/scmroot/erlang-hamcrest
Cloning into '/var/lib/mock/f41-build-873412-16165/root/chroot_tmpdir/scmroot/erlang-hamcrest'...
$ git fetch origin d7772f62647f45ec93eae577de30eaf601f9c796:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-hamcrest
 * [new ref]         d7772f62647f45ec93eae577de30eaf601f9c796 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d7772f6 Switch to Rebar3