Allow disabling udev usage by LVM

Disabling udev usage from LVM seems to be the only observed working
way of running containerized cinder-volume with local LVM backend.

I didn't come across reports that not using udev would have negative
impact on the functionality.

Additional info at
https://groups.google.com/forum/#!topic/docker-user/n4Xtvsb4RAw

Change-Id: I1bf395a6228dba66fa6bf9b8bcc9f3ac3d922a49
Related-Bug: #1700140

manifests/profile/base/lvm.pp

@@ -0,0 +1,40 @@
+# Copyright 2017 Red Hat, Inc.
+#
+# 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.
+#
+# == Class: tripleo::profile::base::lvm
+#
+# LVM profile for tripleo
+#
+# === Parameters
+#
+# [*enable_udev*]
+#   (Optional) Whether to enable udev usage by LVM.
+#   Defaults to true
+#
+class tripleo::profile::base::lvm (
+  $enable_udev        = true,
+) {
+
+  if $enable_udev {
+    $udev_options_value = 1
+  } else {
+    $udev_options_value = 0
+  }
+  augeas {'udev options in lvm.conf':
+    context => '/files/etc/lvm/lvm.conf/activation/dict/',
+    changes => ["set udev_sync/int ${udev_options_value}",
+                "set udev_rules/int ${udev_options_value}"],
+  }
+
+}

spec/classes/tripleo_profile_base_lvm_spec.rb

@@ -0,0 +1,53 @@
+# coding: utf-8
+#
+# Copyright (C) 2017 Red Hat, Inc.
+#
+# 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.
+#
+
+require 'spec_helper'
+
+describe 'tripleo::profile::base::lvm' do
+
+  shared_examples_for 'tripleo::profile::base::lvm' do
+
+    context 'with default params' do
+      it 'should enable udev_sync and udev_rules' do
+        is_expected.to contain_augeas('udev options in lvm.conf')
+          .with_changes(["set udev_sync/int 1",
+                         "set udev_rules/int 1"])
+      end
+    end
+
+    context 'with enable_udev false' do
+      let(:params) { { :enable_udev => false } }
+
+      it 'should disable udev_sync and udev_rules' do
+        is_expected.to contain_augeas('udev options in lvm.conf')
+          .with_changes(["set udev_sync/int 0",
+                         "set udev_rules/int 0"])
+      end
+    end
+  end
+
+
+  on_supported_os.each do |os, facts|
+    context 'on #{os}' do
+      let(:facts) do
+        facts.merge({ :hostname => 'node.example.com' })
+      end
+
+      it_behaves_like 'tripleo::profile::base::lvm'
+    end
+  end
+end