message: Bug in builds/pip.sh causes failure if NO_TEST_ON_INSTALL=1
  do_virtualenv_pip_test() uses ${CLEAN_VENV_DIR} which is defined in
  do_clean_virtualenv_smoke_test(). But if NO_TEST_ON_INSTALL is set to 1
  ${CLEAN_VENV_DIR} would never be defined, and pip.sh will fail.
  It is very likely that we actually meant to use ${VENV_DIR} instead.
diff: @@ -354,7 +354,7 @@ do_virtualenv_pip_test() {
  # Create virtualenv directory for install test
  VENV_DIR="${PIP_TEST_ROOT}/venv"
  create_activate_virtualenv_and_install_tensorflow \
  - "${CLEAN_VENV_DIR}" "${WHL_PATH}"
  + "${VENV_DIR}" "${WHL_PATH}"
  # Install extra pip packages required by the test-on-install
  for PACKAGE in ${INSTALL_EXTRA_PIP_PACKAGES}; do
  