add megacli_version fact

lib/facter/megacli_version.rb

@@ -0,0 +1,13 @@
+Facter.add(:megacli_version) do
+  megacli = Facter.value(:megacli)
+
+  setcode do
+    unless megacli.nil?
+      output = Facter::Util::Resolution.exec("#{megacli} -Version -Cli -aALL")
+      next if output.nil?
+      m = output.match(/MegaCLI SAS RAID Management Tool  Ver ([\d\.]+)/)
+      next unless m.size == 2
+      m[1]
+    end
+  end
+end

spec/fixtures/megacli/version-cli-aall-8.07.07

@@ -0,0 +1,7 @@
+
+
+      MegaCLI SAS RAID Management Tool  Ver 8.07.07 Dec 19, 2012
+
+    (c)Copyright 2011, LSI Corporation, All Rights Reserved.
+
+Exit Code: 0x00

spec/unit/facts/megacli_version_spec.rb

@@ -0,0 +1,31 @@
+require 'spec_helper'
+
+describe 'megacli_version', :type => :fact do
+  before(:each) { Facter.clear }
+
+  context 'megacli fact not set' do
+    it 'should return nil' do
+      Facter.fact(:megacli).stubs(:value).returns(nil)
+      Facter.fact(:megacli_version).value.should be_nil
+    end
+  end
+
+  context 'megacli fact is broken' do
+    it 'should return nil' do
+      Facter.fact(:megacli).stubs(:value).returns('foobar')
+      Facter.fact(:megacli_version).value.should be_nil
+    end
+  end
+
+  context 'megacli fact is working' do
+    it 'should get the version string' do
+      Facter.fact(:megacli).stubs(:value).returns('/usr/bin/MegaCli')
+      Facter::Util::Resolution.stubs(:exec).
+        with('/usr/bin/MegaCli -Version -Cli -aALL').
+        returns(File.read(fixtures('megacli', 'version-cli-aall-8.07.07')))
+      Facter.fact(:megacli_version).value.should == '8.07.07'
+    end
+  end
+
+end
+