$ git clone -n https://src.fedoraproject.org/rpms/erlang-hyper.git /var/lib/mock/f41-build-841964-161420/root/chroot_tmpdir/scmroot/erlang-hyper
Cloning into '/var/lib/mock/f41-build-841964-161420/root/chroot_tmpdir/scmroot/erlang-hyper'...
$ git fetch origin cc42746ed0ea67156c3c01610b12a877d5efabb8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-hyper
 * [new ref]         cc42746ed0ea67156c3c01610b12a877d5efabb8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc42746 Spec-file cleanup