Set Asset Fingerprint as part of the deployment workflow

set_asset_fingerprint.rb

  def set_asset_fingerprint!
    # -- First see if the files have changed
    puts "-----> Calculating Asset Fingerprint"
    fingerprint_method = "find public -type f -exec md5 {} + | awk '{print $0}' | sort | md5"
    current_fingerprint = %x{#{fingerprint_method}}
    fingerprint_file = Rails.root.join('assets.fingerprint')

    if !File.exists?(fingerprint_file) || current_fingerprint != File.read(fingerprint_file)
      execute("#{fingerprint_method} > #{fingerprint_file}")
      # -- Add it to production
      execute("git add #{fingerprint_file}")
      # -- Commit it to production
      execute("git commit -m 'Generating new asset fingerprint at #{DateTime.now.inspect}'")
      puts "-----> Committing new assets fingerprint --> #{File.read(fingerprint_file)}"
    end

    puts "-----> Asset Fingerprint is #{File.read(fingerprint_file)}"
  end