botocoreのパラメータの渡し方、毎回探すのでメモ(BlockDeviceMapping.n.Ebs.SnapshotId なパラメータとか) see http://docs.aws.amazon.com/AWSEC2/latest/APIReference/ApiReference-query-RegisterImage.html

gistfile1.py

import botocore.session

session = botocore.session.get_session()
ec2 = session.get_service('ec2')
op = ec2.get_operation('RegisterImage')
ep = ec2.get_endpoint('us-east-1')

bd = [{"device_name":"/dev/sda", "ebs":{ "snapshot_id":"snap-XXXXXXX", "volume_size":10}}]
op.call(
        ep, 
        name='NAME', 
        description='TEST', 
        architecture='x86_64', 
        kernel_id='aki-b4aa75dd', 
        root_device_name='/dev/sda1', 
        block_device_mappings=bd)