Merge "Check for existence of private key before generating OTA"

          "build/make/target/product/security/testkey")

    # Get signing keys

    OPTIONS.key_passwords = common.GetKeyPasswords([OPTIONS.package_key])

    private_key_path = OPTIONS.package_key + OPTIONS.private_key_suffix

    if not os.path.exists(private_key_path):

      raise common.ExternalError(

                        "Private key {} doesn't exist. Make sure you passed the"

                        " correct key path through -k option".format(

                          private_key_path)

                          )

  if OPTIONS.source_info_dict:

    source_build_prop = OPTIONS.source_info_dict["build.prop"]