puppet_util_platform.rb

RSpec.configure do |c|

  # c.before :each do
  #   # Change autosign from being posix path, which breaks Puppet when
  #   # we're pretending to be on Windows
  #   Puppet[:autosign] = true
  # end

  c.before :each do
    # Work even if you don't specify facts
    f = self.respond_to?(:facts) ? facts : {}

    # Automatically detect whether we're pretending to run on Windows
    Thread.current[:windows?] = true if f[:kernel] == 'windows'
  end

  c.after :each do
    Thread.current[:windows?] = nil
  end

end

module Puppet
  module Util
    class << Platform
      alias_method :orig_windows?, :windows?

      def windows_override?
        Thread.current[:windows?]
      end

      # we need to be selective here
      # there are things like the puppet auto loader that
      # fail if we pretend to be on windows.
      # TODO consider directly monkey patching puppet file type.

      def matching_callers
        caller.select do |line|
          case line
          when %r{puppet/provider/exec.*validatecmd}    then true
          when %r{puppet/type/file}                     then true
          when %r{puppet/parameter/path.*validate_path} then true
          else false
          end
        end
      end

      def caller_needs_override?
        !matching_callers.empty?
      end

      def windows?
        # This is where Puppet normally looks for the target OS.
        # It normally returns the *current* OS (i.e., not Windows,
        # if you're not running the specs on Windows)

        if windows_override? && caller_needs_override?
          true
        else
          orig_windows?
        end
      end
    end
  end
end