Windows package provider: We can't determine the installer type on windows until after the installer is on disk and we can example the file, so we do so in the provider.

inno.rb

# provider/package/windows/inno.rb

class Chef
  class Provider
    class Package
      class Windows
        class Inno
          
          def install_package
          end
          
          def upgrade_pacakge
          end
        
          def remove_package
          end
          
        end
      end
    end
  end
end

msi.rb

# provider/package/windows/msi.rb

class Chef
  class Provider
    class Package
      class Windows
        class MSI
          
          def install_package
          end
          
          def upgrade_pacakge
          end
        
          def remove_package
          end
          
        end
      end
    end
  end
end

windows.rb

# provider/package/windows.rb

class Chef
  class Provider
    class Package
      class Windows
        require 'chef/resource/package'
        require 'chef/provider/package'
        
        require 'chef/provider/package/windows/msi'
        require 'chef/provider/package/windows/inno'
        
        def load_current_resource
          @current_resource = Chef::Resource::Package.new(@new_resource.name)
          
          @provider_class = case installer_type
                            when :msi
                              Chef::Provider::Package::Windows::MSI.new
                            when :inno
                              Chef::Provider::Package::Windows::Inno.new
                            end
        end
        
        def installer_type
          @installer_type || begin
            if @new_resource.installer_type
              @new_resource.installer_type
            else
              basename = ::File.basename(cached_file(@new_resource.source, @new_resource.checksum))
              if basename.split(".").last.downcase == "msi" # Microsoft MSI
               :msi
              else
                # search the binary file for installer type
               contents = ::Kernel.open(::File.expand_path(cached_file(@new_resource.source)), "rb") {|io| io.read } # TODO limit data read in
               case contents
              when /inno/i # Inno Setup
                :inno
              when /wise/i # Wise InstallMaster
                :wise
              when /nsis/i # Nullsoft Scriptable Install System
                :nsis
              else
                # if file is named 'setup.exe' assume installshield
                if basename == "setup.exe"
                  :installshield
                else
                  raise Chef::Exceptions::AttributeNotFound, "installer_type could not be determined, please set manually"
                end
              end
            end
          end
        end
        
        def candidate_version
        end
        
        def install_package
          @provider_class.install_package
        end
        
        def upgrade_package
          @provider_class.upgrade_package
        end
        
        def remove_package
          @provider_class.remove_package
        end
        
        
      end
    end
  end
end