$ git clone -n https://src.fedoraproject.org/rpms/golang-etcd-client-2.git /var/lib/mock/f40-build-2558347-62094/root/chroot_tmpdir/scmroot/golang-etcd-client-2
Cloning into '/var/lib/mock/f40-build-2558347-62094/root/chroot_tmpdir/scmroot/golang-etcd-client-2'...
$ git fetch origin 40d11e5c411a55cae14dd97e8db0b360c2f40cb9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-etcd-client-2
 * [new ref]         40d11e5c411a55cae14dd97e8db0b360c2f40cb9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 40d11e5 Added the README