Base ready

ops/cookbooks/vendor/windows/libraries/powershell_helper.rb

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+#
+# Author:: Seth Chisamore (<schisamo@chef.io>)
+# Cookbook:: windows
+# Library:: powershell_helper
+#
+# Copyright:: 2011-2018, Chef Software, Inc.
+#
+# 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 'chef/mixin/shell_out'
+
+module Powershell
+  module Helper
+    include Chef::Mixin::ShellOut
+
+    def powershell_installed?
+      !powershell_version.nil?
+    end
+
+    def interpreter
+      # force 64-bit powershell from 32-bit ruby process
+      if ::File.exist?("#{ENV['WINDIR']}\\sysnative\\WindowsPowershell\\v1.0\\powershell.exe")
+        "#{ENV['WINDIR']}\\sysnative\\WindowsPowershell\\v1.0\\powershell.exe"
+      elsif ::File.exist?("#{ENV['WINDIR']}\\system32\\WindowsPowershell\\v1.0\\powershell.exe")
+        "#{ENV['WINDIR']}\\system32\\WindowsPowershell\\v1.0\\powershell.exe"
+      else
+        'powershell.exe'
+      end
+    end
+
+    def powershell_version
+      cmd = shell_out("#{interpreter} -InputFormat none -Command \"& echo $PSVersionTable.psversion.major\"")
+      if cmd.stdout.empty? # PowerShell 1.0 doesn't have a $PSVersionTable
+        1
+      else
+        Regexp.last_match(1).to_i if cmd.stdout =~ /^(\d+)/
+      end
+    rescue Errno::ENOENT
+      nil
+    end
+  end
+end