config/templates/gitlab-rails/gem_license_generator.erb

#!/opt/gitlab/embedded/bin/ruby
require 'find'

gem_dir = `<%= install_dir %>/embedded/bin/gem environment gemdir`
gems_directory = File.join(gem_dir.chomp, 'gems')
compiled_licenses_file = "<%= license_file %>"

license_path_list = []
Find.find(gems_directory) do |path|
  begin
    next if File.directory?(path)
    base_name = File.basename(path)
    next if ['.rb', '.yml'].include? File.extname(base_name)

    if base_name.downcase.include?('license') || base_name.downcase.include?('licence') || base_name.downcase.include?('copying')
      license_path_list << path
      full_path = path.dup
      path.slice!(gems_directory)
      license_text = File.read(full_path)
      output = ">>> #{path} \n\n #{license_text} \n\n"
      File.open(compiled_licenses_file, 'a') { |f| f.write(output)}
    end
  rescue
    puts "Error with #{path}"
  end
end