Use addfinalizer to terminate the instances

:testtype: functional

:upstream: yes

"""

import functools

import gzip

import json

import operator

def image_fixture(request, aws_profile):

    """Power on instances for each image and terminate after tests."""

    images = []

    terminate_instances = []

    for image_to_test in request.param:

        aws_profile_name = aws_profile['name']

        # Create some instances to detect on creation, random choice from every

        # Run an instance

        instance_id = aws_utils.run_instances_by_name(

            aws_profile_name, image_type, image_name, count=1)[0]

        terminate_instances.append((aws_profile_name, instance_id))

        request.addfinalizer(functools.partial(

            aws_utils.terminate_instance,

            (aws_profile_name, instance_id)

        ))

        final_image_data = ImageData(image_type,

                                     image_name,

                                     source_image,

                                     instance_id)

        images.append(final_image_data)

    yield images

    # Teardown

    for instance in terminate_instances:

        aws_utils.terminate_instance(instance)

def get_s3_bucket_name():

    """Get the cloudigrade bucket name and raise an exception if not found."""