async def push_to_releases(context):
    """Copy artifacts from one S3 location to another.

    Determine the list of artifacts to be copied and transfer them. These
    copies happen in S3 without downloading/reuploading."""
    context.artifacts_to_beetmove = {}
    product = context.task["payload"]["product"]
    build_number = context.task["payload"]["build_number"]
    version = context.task["payload"]["version"]
    context.bucket_name = get_bucket_name(context, product)

    candidates_prefix = get_candidates_prefix(product, version, build_number)
    releases_prefix = get_releases_prefix(product, version)

    creds = get_creds(context)
    s3_resource = boto3.resource("s3",
                                 aws_access_key_id=creds["id"],
                                 aws_secret_access_key=creds["key"])

    candidates_keys_checksums = list_bucket_objects(context, s3_resource,
                                                    candidates_prefix)
    releases_keys_checksums = list_bucket_objects(context, s3_resource,
                                                  releases_prefix)

    if not candidates_keys_checksums:
        raise ScriptWorkerTaskException(
            "No artifacts to copy from {} so there is no reason to continue.".
            format(candidates_prefix))

    if releases_keys_checksums:
        log.warning("Destination {} already exists with {} keys".format(
            releases_prefix, len(releases_keys_checksums)))

    # Weed out RELEASE_EXCLUDE matches, but allow partners specified in the payload
    push_partners = context.task["payload"].get("partners", [])
    for k in candidates_keys_checksums.keys():
        if "/partner-repacks/" in k:
            partner_match = get_partner_match(k, candidates_prefix,
                                              push_partners)
            if partner_match:
                context.artifacts_to_beetmove[k] = k.replace(
                    get_partner_candidates_prefix(candidates_prefix,
                                                  partner_match),
                    get_partner_releases_prefix(product, version,
                                                partner_match))
            else:
                log.debug("Excluding partner repack {}".format(k))
        elif not matches_exclude(k, RELEASE_EXCLUDE):
            context.artifacts_to_beetmove[k] = k.replace(
                candidates_prefix, releases_prefix)
        else:
            log.debug("Excluding {}".format(k))

    copy_beets(context, candidates_keys_checksums, releases_keys_checksums)
def test_get_partner_candidates_prefix():
    assert get_partner_candidates_prefix(
        "foo/", "p1/s2") == "foo/partner-repacks/p1/s2/v1/"