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//usr/lib/python2.7/dist-packages/euca2ools/commands/ec2/createsubnet.py

# Copyright 2013-2014 Eucalyptus Systems, Inc.
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import argparse

from requestbuilder import Arg
from requestbuilder.exceptions import ArgumentError

from euca2ools.commands.ec2 import EC2Request

class CreateSubnet(EC2Request):
    DESCRIPTION = 'Create a new VPC subnet'
    # We also accept CidrBlock positionally because forgetting -i is common.
    # https://eucalyptus.atlassian.net/browse/TOOLS-497
    ARGS = [Arg('positional_cidr', nargs='?', route_to=None,
                help=argparse.SUPPRESS),
            Arg('-c', '--vpc', dest='VpcId', required=True,
                help='ID of the VPC to create the new subnet in (required)'),
            Arg('-i', '--cidr', dest='CidrBlock', metavar='CIDR',
                help='CIDR address block for the new subnet (required)'),
            Arg('-z', '--availability-zone', dest='AvailabilityZone',
                help='availability zone in which to create the new subnet')]
    LIST_TAGS = ['tagSet']

def configure(self):
        EC2Request.configure(self)
        if self.args.get('positional_cidr'):
            if self.params.get('CidrBlock'):
                # Shouldn't be supplied both positionally and optionally
                raise ArgumentError('unrecognized arguments: {0}'.format(
                    self.args['positional_cidr']))
            self.params['CidrBlock'] = self.args['positional_cidr']
        if not self.params.get('CidrBlock'):
            raise ArgumentError('argument -i/--cidr is required')

def print_result(self, result):
        self.print_subnet(result.get('subnet') or {})