Add developer script to build wheels

Add a script developers can use to build wheels of the global
requirements to speed up package installation time on their local
systems.

Change-Id: I978def344719380989b2454da04c1ae139df18bf

tools/build_wheels.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+#
+#    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.
+#
+# Generate wheels for all of the requirements, ignoring any packages
+# that won't build wheels so we get as many as possible. This is meant
+# to be used on a development box combined with devpi and a wheelhouse
+# configuration setting for pip, such as described in
+# https://www.berrange.com/posts/2014/11/14/faster-rebuilds-for-python-virtualenv-trees/
+#
+# Usage:
+#
+#   install pip for the version(s) of python you want
+#
+#   use each of those versions of pip to install the wheel package
+#     pip2.7 install wheel
+#     pip3.3 install wheel
+#     pip3.4 install wheel
+#
+#   run this script, passing those versions on the command line:
+#
+#     ./tools/build_wheels.sh 2.7 3.3 3.4
+
+versions="$*"
+
+if [ -z "$versions" ]
+then
+    echo "ERROR: Usage: $0 <version>" 1>&2
+    echo "Example: $0 2.7 3.3 3.4" 1>&2
+    exit 1
+fi
+
+grep -v '^#' global-requirements.txt | while read req
+do
+    echo "Building $req"
+    for v in $versions
+    do
+        pip${v} wheel "$req"
+    done
+done