# File lib/rubygems/package.rb, line 782 def self.open(dest, mode = "r", signer = nil, &block) raise "Block needed" unless block_given? case mode when "r" security_policy = signer TarInput.open(dest, security_policy, &block) when "w" TarOutput.open(dest, signer, &block) else raise "Unknown Package open mode" end end