rails_tmp_patch.rb

module ActionView
  module Helpers
    def write_asset_file_contents(joined_asset_path, asset_paths)

      FileUtils.mkdir_p(File.dirname(joined_asset_path))
      File.atomic_write(joined_asset_path, File.join(Rails.root, 'tmp')) { |cache| cache.write(join_asset_file_contents(asset_paths)) }

      # Set mtime to the latest of the combined files to allow for
      # consistent ETag without a shared filesystem.
      mt = asset_paths.map { |p| File.mtime(asset_file_path(p)) }.max
      File.utime(mt, mt, joined_asset_path)
    end
  end
end