$ git clone -n https://src.fedoraproject.org/rpms/erlang-erlsom.git /var/lib/mock/f40-build-1777615-24803/root/chroot_tmpdir/scmroot/erlang-erlsom
Cloning into '/var/lib/mock/f40-build-1777615-24803/root/chroot_tmpdir/scmroot/erlang-erlsom'...
$ git fetch origin 1185de3847c1392721d42e07394b10d15b0d40c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-erlsom
 * [new ref]         1185de3847c1392721d42e07394b10d15b0d40c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1185de3 Erlsom ver. 1.5.1