feat(config): add recipe to configure chrony

attributes/default.rb

@@ -19,6 +19,39 @@
 # Package to install depending on platform
 default[cookbook_name]['package'] = 'chrony'
 
+# Chrony configuration
+# Each hash key is a chrony directive.
+# If the same directive is needed many times, value should be an array
+# If array is let empty, default arrays below is used.
+default[cookbook_name]['config'] = {
+  'server' => [],
+  'stratumweight' => '0',
+  'driftfile' => '/var/lib/chrony/drift',
+  'rtcsync' => '',
+  'makestep' => '10 3',
+  'bindcmdaddress' => [],
+  'keyfile' => '/etc/chrony.keys',
+  'commandkey' => '1',
+  'generatecommandkey' => '',
+  'noclientlog' => '',
+  'logchange' => '0.5',
+  'logdir' => '/var/log/chrony'
+}
+
+# Default configuration arrays
+default[cookbook_name]['default'] = {
+  'server' => [
+    '0.centos.pool.ntp.org iburst',
+    '1.centos.pool.ntp.org iburst',
+    '2.centos.pool.ntp.org iburst',
+    '3.centos.pool.ntp.org iburst'
+  ],
+  'bindcmdaddress' => [
+    '127.0.0.1',
+    '::1'
+  ]
+}
+
 # Configure retries for the package resources, default = global default (0)
 # (mostly used for test purpose)
 default[cookbook_name]['package_retries'] = nil

libraries/platform_helper.rb

@@ -0,0 +1,28 @@
+#
+# Copyright (c) 2017 Make.org
+#
+# 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.
+#
+
+def get_platform_specific(platform)
+  platform_specific = {}
+  case platform
+  when 'centos'
+    platform_specific['config_file'] = '/etc/chrony.conf'
+    platform_specific['service'] = 'chronyd'
+  when 'debian'
+    platform_specific['config_file'] = '/etc/chrony/chrony.conf'
+    platform_specific['service'] = 'chrony'
+  end
+  platform_specific
+end

recipes/config.rb

@@ -0,0 +1,33 @@
+#
+# Copyright (c) 2017 Make.org
+#
+# 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.
+#
+
+# Deploy chrony configuration
+platform = get_platform_specific(node['platform'])
+header = "# Produced by Chef -- changes will be overwritten\n"
+content = node[cookbook_name]['config'].to_h.map do |hk, hv|
+  if hv.is_a?(Array)
+    hv = node[cookbook_name]['default'][hk] if hv.empty?
+    hv.map { |v| "#{hk} #{v}" }
+  else
+    "#{hk} #{hv}".strip
+  end
+end
+
+file platform['config_file'] do
+  content "#{header}\n#{content.join("\n")}"
+  mode '0644'
+  notifies :restart, "service[#{platform['service']}]"
+end

recipes/default.rb

@@ -15,3 +15,4 @@
 #
 
 include_recipe "#{cookbook_name}::package"
+include_recipe "#{cookbook_name}::config"