Create/Extract a tarball from ruby

tar.rb

require 'find'
require 'archive/tar/minitar'

module IdiomaticTar
  def create_tarball(filename:, directory:)
    base_dir = Pathname.new(directory).parent
    FileUtils.cd(base_dir) do
      Pathname.new(filename).open('wb') do |tarball|
        Zlib::GzipWriter.wrap(tarball) do |gz|
          Archive::Tar::Minitar::Output.open(gz) do |tar|
            Find.find(directory) do |path|
              pn = Pathname.new(path)
              name = pn.relative_path_from(base_dir)
              Archive::Tar::Minitar.pack_file(name.to_s, tar)
            end
          end
        end
      end
    end
  end

  def extract_tarball(filename:, directory:)
    Pathname.new(filename).open('rb') do |tarball|
      Zlib::GzipReader.wrap(tarball) do |gz|
        Archive::Tar::Minitar.unpack(gz, directory)
      end
    end
  end

end

create_tarball doesn't use Minitar.pack as that method refuses to use relative paths. This approach creates a tarball with one top level directory that contains no slashes.