[ "$NUM_OPENSTACK_SITES" ] || NUM_OPENSTACK_SITES=1
source $WORKSPACE/.venv-openstack/bin/activate
-ADDR=(`openstack stack show -f json -c outputs $STACK_NAME | \
+PYTHON="$WORKSPACE/.venv-openstack/bin/python"
+OPENSTACK="$WORKSPACE/.venv-openstack/bin/openstack"
+
+ADDR=(`$PYTHON $OPENSTACK stack show -f json -c outputs $STACK_NAME | \
jq -r '.outputs[] | \
select(.output_key | match("^vm_[0-9]+_ips$")) | \
.output_value | .[]'`)