Gem::Package::TarWriter#add_symlink

# File tmp/rubies/ruby-3.0.5/lib/rubygems/package/tar_writer.rb, line 230
def add_symlink(name, target, mode)
  check_closed

  name, prefix = split_name name

  header = Gem::Package::TarHeader.new(:name => name, :mode => mode,
                                       :size => 0, :typeflag => "2",
                                       :linkname => target,
                                       :prefix => prefix,
                                       :mtime => Gem.source_date_epoch).to_s

  @io.write header

  self
end