$ git clone -n https://src.fedoraproject.org/rpms/erlang-snappy.git /var/lib/mock/f41-build-811233-147301/root/chroot_tmpdir/scmroot/erlang-snappy
Cloning into '/var/lib/mock/f41-build-811233-147301/root/chroot_tmpdir/scmroot/erlang-snappy'...
$ git fetch origin 066755d9fbc63004104937fda0a69d8b982b75c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-snappy
 * [new ref]         066755d9fbc63004104937fda0a69d8b982b75c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 066755d Update to ver. 1.1.2