Set up venv for zuul-swift-logs

Set up a venv for zuul-swift-logs and install its dependencies
(python-magic) there instead of as system packages.

For DIB use 90 as uploading logs may be considered more important
than installing zuul.

Change-Id: Id0fc01729853e65c81cdd50e4ffa4d0d6de00ae9

nodepool/elements/nodepool-base/install.d/90-venv-swift-logs

@@ -0,0 +1,21 @@
+#!/bin/bash -xe
+# Copyright (C) 2015 Rackspace Australia
+#
+# 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.
+
+# Create a virtualenv for zuul-swift-logs
+# This is in /usr instead of /usr/local due to this bug on precise:
+# https://bugs.launchpad.net/ubuntu/+source/python2.7/+bug/839588
+# Be explicit about the Python version since py3k-precise nodes default
+# to using 3.3 with virtualenv.
+sudo -H virtualenv -p python2 /usr/zuul-swift-logs-env
+sudo -H /usr/zuul-swift-logs-env/bin/pip install python-magic

nodepool/scripts/prepare_node.sh

@@ -163,5 +163,13 @@ sudo virtualenv -p python2 /usr/zuul-env
 sudo -H /usr/zuul-env/bin/pip install /tmp/zuul
 sudo rm -fr /tmp/zuul
 
+# Create a virtualenv for zuul-swift-logs
+# This is in /usr instead of /usr/local due to this bug on precise:
+# https://bugs.launchpad.net/ubuntu/+source/python2.7/+bug/839588
+# Be explicit about the Python version since py3k-precise nodes default
+# to using 3.3 with virtualenv.
+sudo -H virtualenv -p python2 /usr/zuul-swift-logs-env
+sudo -H /usr/zuul-swift-logs-env/bin/pip install python-magic
+
 sync
 sleep 5