Merge pull request #32 from chef/kernel

add linux kernel resources

lib/resources/kernel_module.rb

@@ -0,0 +1,33 @@
+# encoding: utf-8
+# license: All rights reserved
+
+# Verifies if a kernel module is loaded
+# Usage:
+# describe kernel_module('bridge') do
+#   it { should be_loaded }
+# end
+class KernelModule < Vulcano.resource(1)
+  name 'kernel_module'
+
+  def initialize(modulename = nil)
+    @module = modulename
+
+    # this resource is only supported on Linux
+    return skip_resource 'The `kernel_module` resource is not supported on your OS.' if !%w{ubuntu debian redhat fedora arch}.include? vulcano.os[:family]
+  end
+
+  def loaded?
+    # get list of all modules
+    cmd = vulcano.run_command('lsmod')
+    return false if cmd.exit_status != 0
+
+    # check if module is loaded
+    re = Regexp.new('^'+Regexp.quote(@module)+'\s')
+    found = cmd.stdout.match(re)
+    !found.nil?
+  end
+
+  def to_s
+    "Kernel Module #{@module}"
+  end
+end

lib/resources/kernel_parameter.rb

@@ -0,0 +1,54 @@
+# encoding: utf-8
+# license: All rights reserved
+
+# Verifies if a kernel parameter is set
+# describe kernel_parameter('net.ipv4.conf.all.forwarding') do
+#   its(:value) { should eq 0 }
+# end
+class KernelParameter < Vulcano.resource(1)
+  name 'kernel_parameter'
+
+  def initialize(parameter = nil)
+    @parameter = parameter
+
+    # this resource is only supported on Linux
+    return skip_resource 'The `kernel_module` resource is not supported on your OS.' if !%w{ubuntu debian redhat fedora arch}.include? vulcano.os[:family]
+  end
+
+  def value
+    cmd = vulcano.run_command("/sbin/sysctl -q -n #{@parameter}")
+    return nil if cmd.exit_status != 0
+    # remove whitespace
+    cmd = cmd.stdout.chomp.strip
+    # convert to number if possible
+    cmd = cmd.to_i if cmd.match(/^\d+$/)
+    cmd
+  end
+
+  def to_s
+    "Kernel Parameter #{@parameter}"
+  end
+end
+
+# for compatability with serverspec
+# this is deprecated syntax and will be removed in future versions
+class LinuxKernelParameter < KernelParameter
+  name 'linux_kernel_parameter'
+
+  def initialize(parameter)
+    super(parameter)
+  end
+
+  def value
+    deprecated
+    super()
+  end
+
+  def deprecated
+    warn '[DEPRECATION] `linux_kernel_parameter(parameter)` is deprecated.  Please use `kernel_parameter(parameter)` instead.'
+  end
+
+  def to_s
+    "Kernel Parameter #{@parameter}"
+  end
+end

lib/vulcano/resource.rb

@@ -30,6 +30,8 @@ require 'resources/file'
 require 'resources/gem'
 require 'resources/group_policy'
 require 'resources/inetd_conf'
+require 'resources/kernel_module'
+require 'resources/kernel_parameter'
 require 'resources/limits_conf'
 require 'resources/login_def'
 require 'resources/mysql'

test/helper.rb

@@ -70,6 +70,8 @@ def loadResource (resource, *args)
     "Get-Package -Name 'Mozilla Firefox' | ConvertTo-Json" => cmd.call('get-package'),
     "New-Object -Type PSObject | Add-Member -MemberType NoteProperty -Name Service -Value (Get-Service -Name dhcp| Select-Object -Property Name, DisplayName, Status) -PassThru | Add-Member -MemberType NoteProperty -Name WMI -Value (Get-WmiObject -Class Win32_Service | Where-Object {$_.Name -eq 'dhcp' -or $_.DisplayName -eq 'dhcp'} | Select-Object -Property StartMode) -PassThru | ConvertTo-Json" => cmd.call('get-service-dhcp'),
     "Get-WindowsFeature | Where-Object {$_.Name -eq 'dhcp' -or $_.DisplayName -eq 'dhcp'} | Select-Object -Property Name,DisplayName,Description,Installed,InstallState | ConvertTo-Json" => cmd.call('get-windows-feature'),
+    'lsmod' => cmd.call('lsmod'),
+    '/sbin/sysctl -q -n net.ipv4.conf.all.forwarding' => cmd.call('sbin_sysctl'),
   }
 
   # load resource

test/unit/mock/cmd/lsmod

@@ -0,0 +1,2 @@
+Module                  Size  Used by
+bridge                 73728  1 br_netfilter

test/unit/mock/cmd/sbin_sysctl

@@ -0,0 +1 @@
+1

test/unit/resource_kernel_module_test.rb

@@ -0,0 +1,21 @@
+# encoding: utf-8
+
+require 'helper'
+require 'vulcano/resource'
+
+describe 'Vulcano::Resources::KernelModule' do
+  it 'verify kernel_module parsing' do
+    resource = loadResource('kernel_module', 'bridge')
+    _(resource.loaded?).must_equal true
+  end
+
+  it 'verify kernel_module parsing' do
+    resource = loadResource('kernel_module', 'bridges')
+    _(resource.loaded?).must_equal false
+  end
+
+  it 'verify kernel_module parsing' do
+    resource = loadResource('kernel_module', 'dhcp')
+    _(resource.loaded?).must_equal false
+  end
+end

test/unit/resource_kernel_parameter_test.rb

@@ -0,0 +1,15 @@
+# encoding: utf-8
+
+require 'helper'
+require 'vulcano/resource'
+
+describe 'Vulcano::Resources::KernelParameter' do
+  describe 'kernel_parameter' do
+    let(:resource) { loadResource('kernel_parameter', 'net.ipv4.conf.all.forwarding') }
+
+    it 'verify kernel_parameter parsing' do
+      _(resource.value).must_equal 1
+    end
+
+  end
+end