def prevalidate_arguments()

in awscli/customizations/opsworks.py [0:0]

• 30 lines of code
• 17 McCabe index (conditional complexity)

    def prevalidate_arguments(self, args):
        """
        Validates command line arguments before doing anything else.
        """
        if not args.target and not args.local:
            raise ValueError("One of target or --local is required.")
        elif args.target and args.local:
            raise ValueError(
                "Arguments target and --local are mutually exclusive.")

        if args.local and platform.system() != 'Linux':
            raise ValueError(
                "Non-Linux instances are not supported by AWS OpsWorks.")

        if args.ssh and (args.username or args.private_key):
            raise ValueError(
                "Argument --override-ssh cannot be used together with "
                "--ssh-username or --ssh-private-key.")

        if args.infrastructure_class == 'ec2':
            if args.private_ip:
                raise ValueError(
                    "--override-private-ip is not supported for EC2.")
            if args.public_ip:
                raise ValueError(
                    "--override-public-ip is not supported for EC2.")

        if args.infrastructure_class == 'on-premises' and \
                args.use_instance_profile:
            raise ValueError(
                "--use-instance-profile is only supported for EC2.")

        if args.hostname:
            if not HOSTNAME_RE.match(args.hostname):
                raise ValueError(
                    "Invalid hostname: '%s'. Hostnames must consist of "
                    "letters, digits and dashes only and must not start or "
                    "end with a dash." % args.hostname)