(maint) - Add a fact for capturing the mysql version installed

- Add spec test for mysql_version fact
- Add `mysql_version` fact to README

README.md

@@ -784,6 +784,10 @@ The library file name.
 
 ###Facts
 
+#### `mysql_version`
+
+Determines the MySql version by parsing the output from `mysql --version`
+
 #### `mysql_server_id`
 
 Generates a unique id, based on the node's MAC address, which can be used as

lib/facter/mysql_version.rb

@@ -0,0 +1,8 @@
+Facter.add("mysql_version") do
+  setcode do
+    mysql_ver = Facter::Util::Resolution.exec('mysql --version')
+    if mysql_ver
+      mysql_ver.match(/\d+\.\d+\.\d+/)[0]
+    end
+  end
+end

spec/unit/facter/mysql_version_spec.rb

@@ -0,0 +1,20 @@
+require "spec_helper"
+
+describe Facter::Util::Fact do
+  before {
+    Facter.clear
+  }
+
+  describe "mysql_version" do
+    context 'with value' do
+      before :each do
+        Facter::Util::Resolution.stubs(:exec).with('mysql --version').returns('mysql  Ver 14.12 Distrib 5.0.95, for redhat-linux-gnu (x86_64) using readline 5.1')
+      end
+      it {
+        expect(Facter.fact(:mysql_version).value).to eq('5.0.95')
+      }
+    end
+
+  end
+
+end