Add host_uuid to libvirtd.conf

Add host_uuid generated by uuidgen to libvirtd.conf

Change-Id: Ib060bff4b1f547b4db255969bc8cb3119a85ba6d
Closes-Bug: 1378962

lib/facter/libvirt_uuid.rb

@@ -0,0 +1,11 @@
+require 'facter'
+Facter.add(:libvirt_uuid) do
+  setcode do
+    uuid_file_path = '/etc/libvirt/libvirt_uuid'
+    if File.file? uuid_file_path
+      File.read uuid_file_path
+    else
+      nil
+    end
+  end
+end

manifests/migration/libvirt.pp

@@ -21,11 +21,16 @@
 #   (optional) Migration flags to be set for block migration (string value)
 #   Defaults to undef
 #
+# [*override_uuid*]
+#   (optional) Set uuid not equal to output from dmidecode (boolean)
+#   Defaults to false
+#
 class nova::migration::libvirt(
   $use_tls              = false,
   $auth                 = 'none',
   $live_migration_flag  = undef,
   $block_migration_flag = undef,
+  $override_uuid        = false,
 ){
 
   include ::nova::deps
@@ -62,6 +67,26 @@ class nova::migration::libvirt(
   File_line<| tag == 'libvirt-file_line' |>
   ~> Service['libvirt']
 
+  if $override_uuid {
+    if ! $::libvirt_uuid {
+      $host_uuid = generate('/bin/cat', '/proc/sys/kernel/random/uuid')
+      file { '/etc/libvirt/libvirt_uuid':
+        content => $host_uuid
+      }
+    } else {
+      $host_uuid = $::libvirt_uuid
+    }
+
+    augeas { 'libvirt-conf-uuid':
+      context => '/files/etc/libvirt/libvirtd.conf',
+      changes => [
+        "set host_uuid ${host_uuid}",
+      ],
+      notify  => Service['libvirt'],
+      require => Package['libvirt'],
+    }
+  }
+
   case $::osfamily {
     'RedHat': {
       file_line { '/etc/libvirt/libvirtd.conf listen_tls':

spec/classes/nova_migration_libvirt_spec.rb

@@ -22,6 +22,14 @@ require 'spec_helper'
 
 describe 'nova::migration::libvirt' do
 
+  generate = {}
+
+  before(:each) {
+    Puppet::Parser::Functions.newfunction(:generate, :type => :rvalue) {
+        |args| generate.call()
+    }
+    generate.stubs(:call).returns('0000-111-111')
+  }
 
   let :pre_condition do
    'include nova
@@ -38,6 +46,19 @@ describe 'nova::migration::libvirt' do
       it { is_expected.to contain_file_line('/etc/libvirt/libvirtd.conf auth_tcp').with(:line => "auth_tcp = \"none\"") }
     end
 
+    context 'with override_uuid enabled' do
+      let :params do
+        {
+          :override_uuid => true,
+        }
+      end
+
+      it { is_expected.to contain_augeas('libvirt-conf-uuid').with({
+        :context => '/files/etc/libvirt/libvirtd.conf',
+        :changes => [ "set host_uuid 0000-111-111" ],
+      }).that_requires('Package[libvirt]').that_notifies('Service[libvirt]') }
+    end
+
     context 'with tls enabled' do
       let :params do
         {