@@ -93,6 +93,20 @@ if [[ $EUID -eq 0 ]]; then

     exit 1

 fi

+# OpenStack is designed to run at a system level, with system level

+# installation of python packages. It does not support running under a

+# virtual env, and will fail in really odd ways if you do this. Make

+# this explicit as it has come up on the mailing list.

+if [[ -n "$VIRTUAL_ENV" ]]; then

+    echo "You appear to be running under a python virtualenv."

+    echo "DevStack does not support this, as we my break the"

+    echo "virtualenv you are currently in by modifying "

+    echo "external system-level components the virtualenv relies on."

+    echo "We reccommend you use a separate virtual-machine if "

+    echo "you are worried about DevStack taking over your system."

+    exit 1

+fi

+

 # Provide a safety switch for devstack. If you do a lot of devstack,

 # on a lot of different environments, you sometimes run it on the

 # wrong box. This makes there be a way to prevent that.