$ git clone -n https://src.fedoraproject.org/rpms/erlang-proper.git /var/lib/mock/f42-build-3459440-45513/root/chroot_tmpdir/scmroot/erlang-proper
Cloning into '/var/lib/mock/f42-build-3459440-45513/root/chroot_tmpdir/scmroot/erlang-proper'...
$ git fetch origin 683f7a81681fdff367e25126fd2f0c0b70368bb3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-proper
 * [new ref]         683f7a81681fdff367e25126fd2f0c0b70368bb3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 683f7a8 PropEr ver .1.5.0