class Gem::Commands::CertCommand

def load_default_cert
  cert_file = File.join Gem.default_cert_path
  cert = File.read cert_file
  options[:issuer_cert] = OpenSSL::X509::Certificate.new cert
rescue Errno::ENOENT
  alert_error \
    "--certificate not specified and ~/.gem/gem-public_cert.pem does not exist"
  terminate_interaction 1
rescue OpenSSL::X509::CertificateError
  alert_error \
    "--certificate not specified and ~/.gem/gem-public_cert.pem is not valid"
  terminate_interaction 1
end