tools: docker/env.sh: only allow run in host system

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>

tools/docker/env.sh

@@ -1,8 +1,14 @@
 #!/bin/bash
 #
-# env.sh -- list current system information
+# env.sh -- list current system information of running docker
 #
 
+# dump system information of lab is not meaningful
+if [ -d '/configs' ]; then
+    echo "LOG: Please run this in host system, not in lab."
+    exit 0
+fi
+
 # Hardware
 echo "Product: `cat /sys/class/dmi/id/product_name`"