Compress all *.json files of a directory using tar and gzip

tar_gz_squeeze.rb

require 'rubygems/package'

def tar_gz_squeeze(dirname, filename: nil)
  filename = filename || dirname

  File.open("#{filename}.tar.gz", "wb") do |file|
    Zlib::GzipWriter.wrap(file) do |gz|
      Gem::Package::TarWriter.new(gz) do |tar|
        Dir.glob("#{dirname}/*.json").each do |f|
          puts "adding #{File.basename(f)}..."
          content = File.read(f, mode: 'rb')
          tar.add_file_simple(File.basename(f), 0444, content.size) do |io|
            io.write(content)
          end
        end
      end
    end
  end

end

tar_gz_squeeze("files")