code: def install_deb(pkgname, url):
      
      status = run("dpkg-query -W -f='${{Status}}' {p}; true".format(p=pkgname))
      if ('installed' not in status) or ('not-installed' in status):
          deb = url.rpartition('/')[2]
          debtmp = '/tmp/{}'.format(deb)
          run("wget --no-check-certificate -qc -O '{}' '{}'".format(debtmp, url))
          sudo("dpkg -i '{0}' && rm -f '{0}'".format(debtmp))
          return True
      else:
          return False
docs: Install package from custom deb hosted on S3.
      Return true if package was installed by this invocation.