Determine if a KB is installed via win32ole on ruby

wua.rb

# Author:: Bryan McLellan <btm@loftninjas.org>
# Copyright:: Copyright 2014 Chef Software, 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.

# searches for a KB, but could give a false negative if a KB has been superseded, e.g. a rollup.
require 'rubygems'
require 'win32ole'

kbs = [ "KB2918614", "2966828", "2538242", "2538243", "2972103", "2990967", "3001237" ]

# Returns an IUpdateCollection
def get_updates(query_string)
  update_session = WIN32OLE.new("Microsoft.Update.Session")
  update_searcher = update_session.CreateUpdateSearcher
  results = update_searcher.Search(query_string)
  results.Updates
end

def kb_installed?(target_kb)
  # Ensure we have just the KB number
  target_kb.gsub(/^KB/, '')

  update_collection = get_updates('IsInstalled=1')
  update_collection.each do |item|
    item.KBArticleIDs.each do |kb|
      if kb == target_kb
        item.SecurityBulletinIDs.each do |id|
          puts "KB#{kb}: SecurityBulletinID: #{id}"
        end

        item.SupersededUpdateIDs.each do |id|
          puts "KB#{kb}: SupersededUpdateID: #{id}"
        end

        return true
      end
    end
  end

  return false
end

kbs.each do |kb|
  if kb_installed?(kb)
    puts "Found #{kb} installed"
  else
    puts "#{kb} not installed"
  end
end