Do not fail cogsetup.sh if repo is not in PATH

  # it with this function. If the user is running repo within a Cog workspace,

  # we'll fail with an error, otherwise, we run the original repo command with

  # the given args.

  ORIG_REPO_PATH=`which repo`

  if ! ORIG_REPO_PATH=`which repo`; then

    return 0

  fi

  function repo {

    if [[ "${PWD}" == /google/cog/* ]]; then

      echo "\e[01;31mERROR:\e[0mrepo command is disallowed within Cog workspaces."