ec2.py 文件源码

def create_block_device(module, ec2, volume):
    # Not aware of a way to determine this programatically
    # http://aws.amazon.com/about-aws/whats-new/2013/10/09/ebs-provisioned-iops-maximum-iops-gb-ratio-increased-to-30-1/
    MAX_IOPS_TO_SIZE_RATIO = 30

    # device_type has been used historically to represent volume_type,
    # however ec2_vol uses volume_type, as does the BlockDeviceType, so
    # we add handling for either/or but not both
    if all(key in volume for key in ['device_type','volume_type']):
        module.fail_json(msg = 'device_type is a deprecated name for volume_type. Do not use both device_type and volume_type')

    # get whichever one is set, or NoneType if neither are set
    volume_type = volume.get('device_type') or volume.get('volume_type')

    if 'snapshot' not in volume and 'ephemeral' not in volume:
        if 'volume_size' not in volume:
            module.fail_json(msg = 'Size must be specified when creating a new volume or modifying the root volume')
    if 'snapshot' in volume:
        if volume_type == 'io1' and 'iops' not in volume:
            module.fail_json(msg = 'io1 volumes must have an iops value set')
        if 'iops' in volume:
            snapshot = ec2.get_all_snapshots(snapshot_ids=[volume['snapshot']])[0]
            size = volume.get('volume_size', snapshot.volume_size)
            if int(volume['iops']) > MAX_IOPS_TO_SIZE_RATIO * size:
                module.fail_json(msg = 'IOPS must be at most %d times greater than size' % MAX_IOPS_TO_SIZE_RATIO)
        if 'encrypted' in volume:
            module.fail_json(msg = 'You can not set encryption when creating a volume from a snapshot')
    if 'ephemeral' in volume:
        if 'snapshot' in volume:
            module.fail_json(msg = 'Cannot set both ephemeral and snapshot')
    return BlockDeviceType(snapshot_id=volume.get('snapshot'),
                           ephemeral_name=volume.get('ephemeral'),
                           size=volume.get('volume_size'),
                           volume_type=volume_type,
                           delete_on_termination=volume.get('delete_on_termination', False),
                           iops=volume.get('iops'),
                           encrypted=volume.get('encrypted', None))