Build wheel house during nodepool devstack caching

This commit adds calling tools/build_wheels.sh to the cache devstack
step in the nodepool scripts. This will generate and cache the wheels
before the devstack run, which is a length process normally involving C
compilations.

Change-Id: I9064d7d9b9b879a05d665c3b002a631fcc953f52

nodepool/elements/cache-devstack/install.d/98-build-wheelhouse

@@ -0,0 +1,35 @@
+#!/bin/bash
+# Copyright (C) 2015 Hewlett-Packard Development Company, L.P.
+#
+# 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.
+
+set -eux
+
+
+DEVSTACK='/opt/git/openstack-dev/devstack'
+
+export WHEELHOUSE='/home/jenkins/cache/files/wheelhouse'
+
+pushd $DEVSTACK
+for branch in $(git branch -a | grep '^\s*remotes/origin') ; do
+    if [[ $(echo $branch | grep '^->') || $(echo $branch | grep "^origin")  || $(echo $branch | grep 'HEAD') ]]; then
+        continue
+    fi
+    sudo git checkout $branch
+    if [[ -f $DEVSTACK/tools/build_wheels.sh ]] ; then
+        bash tools/build_wheels.sh
+    fi
+done
+popd

nodepool/scripts/cache_devstack.py

@@ -94,6 +94,15 @@ def _find_images(basedir):
     return images
 
 
+def _build_wheelhouse(basedir):
+    build_wheels_path = os.path.join(basedir, 'tools/build_wheels.sh')
+    if os.path.isfile(build_wheels_path):
+        env = os.environ
+        # Makes output dir for wheelhouse CACHEDIR/wheelhouse
+        env['WHEELHOUSE'] = os.path.join(CACHEDIR, 'wheelhouse')
+        run_local(['bash', 'tools/build_wheels.sh'], cwd=DEVSTACK, env=env)
+
+
 def local_prep(distribution):
     branches = []
     for branch in git_branches():
@@ -133,6 +142,7 @@ def local_prep(distribution):
 
         branch_data['images'] = images
         branches.append(branch_data)
+        _build_wheelhouse(DEVSTACK)
     return branches