Zip a directory to memory in Ruby. The rubyzip library is pretty hard to use. I tried for ages to figure out how to zip a directory to a string in memory. So here's an example that zips the given directory to a Ruby StringIO object using rubyzip.

gistfile1.rb

require 'zip/zip'

def zip(dir)
  Zip::ZipOutputStream::write_buffer do |zos|
    Dir["#{dir}/**/**"].each do |file|
      path_for_file_in_zip = file.sub(/\A#{dir}\//, '')
      if !File.directory?(file)
        zip_entry = zos.put_next_entry(path_for_file_in_zip)
        zos << IO.read(file)
      end
    end
  end
end