# Author:: Bryan McLellan <btm@loftninjas.org>
# Author:: Seth Chisamore <schisamo@chef.io>
# Copyright:: Copyright (c) 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.
#

require_relative "platform_introspection"
require_relative "registry_helper"

class Chef
  module DSL
    module RebootPending

      include Chef::DSL::RegistryHelper
      include Chef::DSL::PlatformIntrospection

      # Returns true if the system needs a reboot or is expected to reboot
      # Note that we will silently miss any other platform-specific reboot notices besides Windows+Ubuntu.
      def reboot_pending?
        # don't break when used as a mixin in contexts without #node (e.g. specs).
        if respond_to?(:node, true) && node.run_context.reboot_requested?
          true
        elsif platform?("windows")
          # PendingFileRenameOperations contains pairs (REG_MULTI_SZ) of filenames that cannot be updated
          # due to a file being in use (usually a temporary file and a system file)
          # \??\c:\temp\test.sys!\??\c:\winnt\system32\test.sys
          # http://technet.microsoft.com/en-us/library/cc960241.aspx
          registry_value_exists?("HKLM\\SYSTEM\\CurrentControlSet\\Control\\Session Manager", { name: "PendingFileRenameOperations" }) ||

            # RebootRequired key contains Update IDs with a value of 1 if they require a reboot.
            # The existence of RebootRequired alone is sufficient on my Windows 8.1 workstation in Windows Update
            registry_key_exists?('HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired') ||

            # Vista + Server 2008 and newer may have reboots pending from CBS
            registry_key_exists?('HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\RebootPending')
        elsif platform_family?("debian")
          File.exist?("/var/run/reboot-required")
        else
          false
        end
      end
    end
  end
end
