Minimal virtualenv for swagger docs

Change-Id: I63815145fc4049373854f32388558912fe4382e3
diff --git a/docs/venv-xosdocs.sh b/docs/venv-xosdocs.sh
new file mode 100755
index 0000000..a1c4dfa
--- /dev/null
+++ b/docs/venv-xosdocs.sh
@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+# Copyright 2017-present Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+BASEDIR=$(pwd)
+VENVDIR=venv-xosdocs
+
+# create venv if it's not yet there
+if [ ! -d "$BASEDIR/$VENVDIR" ]; then
+    echo "Setting up virtualenv for XOS Swagger Docs"
+    virtualenv -q $BASEDIR/$VENVDIR --no-site-packages
+    pip install --upgrade pip
+    echo "Virtualenv created."
+fi
+
+# activate the virtual env
+if [ ! $VIRTUAL_ENV ]; then
+    source $BASEDIR/$VENVDIR/bin/activate
+    echo "Virtualenv activated."
+fi
+
+# install pip packages
+pip install -e $BASEDIR/$VENVDIR/../../lib/xos-genx
+pip install plyxproto jinja2 pattern astunparse pyyaml
+