Adds validation of env.
Adds validation of env.

ShengjieLuo/pachyderm,alexdebrie/pachyderm,klucar/pachyderm,sambooo/pachyderm,sambooo/pachyderm,alexdebrie/pachyderm,klucar/pachyderm,ShengjieLuo/pachyderm,alexdebrie/pachyderm,sambooo/pachyderm,ShengjieLuo/pachyderm,klucar/pachyderm