def describe_build(BuildId=None):
    """
    Retrieves properties for a build. To get a build record, specify a build ID. If successful, an object containing the build properties is returned.
    See also: AWS API Documentation
    
    
    :example: response = client.describe_build(
        BuildId='string'
    )
    
    
    :type BuildId: string
    :param BuildId: [REQUIRED]
            Unique identifier for a build to retrieve properties for.
            

    :rtype: dict
    :return: {
        'Build': {
            'BuildId': 'string',
            'Name': 'string',
            'Version': 'string',
            'Status': 'INITIALIZED'|'READY'|'FAILED',
            'SizeOnDisk': 123,
            'OperatingSystem': 'WINDOWS_2012'|'AMAZON_LINUX',
            'CreationTime': datetime(2015, 1, 1)
        }
    }
    
    
    """
    pass
