Add ohai plugin to collect sysctl settings

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## [1.67.1] - 2022-06-09
+
+### Added
+- New Ohai plugin [`sysctl.rb`](files/default/ohai_plugins/sysctl.rb) added to collect
+  information on sysctl settings
+
 ## [1.67.0] - 2022-06-08
 
 ### Changed

files/default/ohai_plugins/sysctl.rb

+#
+# Cookbook Name:: sys
+# Ohai plugin to collect sysctl information
+#
+# Copyright 2022 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH
+#
+# Authors:
+#  Christopher Huhn   <c.huhn@gsi.de>
+#
+# 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.
+#
+
+Ohai.plugin(:Sysctl) do
+  provides 'sysctl'
+
+  collect_data(:default) do
+    cmd = 'sysctl -a'
+    settings = shell_out(cmd).stdout.scan(/^(.*) = (.*)$/)
+
+    sysctl Mash.new
+    settings.each do |key, value|
+      # skip zero values to reduce space requirements
+      next if value == '0'
+
+      # split the sysctl key into components and create s nice data structure
+      path = key.split('.')
+      x = sysctl
+      path[0..-2].each do |component|
+        x[component] ||= Mash.new
+        x = x[component]
+      end
+      x[path.last] = value
+    end
+  end
+end

metadata.rb

@@ -16,4 +16,4 @@ supports         'debian'
 depends          'line', '< 1.0'
 depends          'chef-vault'
 
-version          '1.67.0'
+version          '1.67.1'

test/integration/sys_ohai/serverspec/localhost/ohai_spec.rb

@@ -101,4 +101,22 @@ describe "plugins" do
                      })
     end
   end
+
+  describe 'sysctl' do
+    subject do
+      @ohai.require_plugin('sysctl')
+
+      @ohai.data['sysctl']
+    end
+
+    it { should be_a(Mash) }
+    it do
+      # TODO: don't hard-code rsa here
+      #  'anything'  or match(...) don't seem to work for a hash key though
+      should include(kernel: a_hash_including(
+                       ostype: 'Linux',
+                       version: anything
+                     ))
+    end
+  end
 end