[OHAI-340] Added uptime plugin for Windows

lib/ohai/plugins/windows/uptime.rb

@@ -0,0 +1,23 @@
+#
+# Author:: Paul Mooring (paul@opscode.com)
+# Copyright:: Copyright (c) 2012 Opscode, Inc.
+# License:: Apache License, Version 2.0
+#
+# 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.
+#
+require 'ruby-wmi'
+
+provides "uptime", "uptime_seconds"
+
+uptime_seconds ::WMI::Win32_PerfFormattedData_PerfOS_System.find(:first).SystemUpTime.to_i
+uptime self._seconds_to_human(uptime_seconds)