unzip.rb

['rubygems', 'pathname', 'zip/zip', 'fileutils'].each {|x| require x}
UUIDchars = ("a".."f").to_a + ("0".."9").to_a
def uuid_seg(len)
  ret = ""
  1.upto(len) { |i| ret << UUIDchars[rand(UUIDchars.size-1)] }; ret
end

def random_uuid
  "#{uuid_seg(8)}"
end

def extract_zip_to_tempdir(zip_path)
  temp_root = Pathname.new((ENV['TEMP'] || ENV['TMP'] || '/tmp'))
  raise "Can't find a temp directory" unless temp_root.exist?

  # Make unique temporary directory
  temp_dir = nil
  while (temp_dir = temp_root.join(random_uuid())).exist?
    nil
  end
  temp_dir.mkpath

  Zip::ZipFile.open(zip_path) do |zf|
    zf.each do |e|
      #ignore osx specific file info
      next if e.name =~ /__MACOSX/ or e.name =~ /\.DS_Store/ or !e.file?
      #flatten the directory
      zf.extract(e.name, File.join(temp_dir, Pathname.new(e.name).basename)) 
    end
  end

  temp_dir.to_s
end

puts extract_zip_to_tempdir('sample.zip')

# to get rid of directory after handling the contents:
# FileUtils.rm_rf temp_dir.to_s