def get_compute_node_root_volume_tags(cluster, os):
    "Return the given cluster's compute node's root volume's tags."
    compute_nodes = cluster.get_cluster_instance_ids(node_type='Compute')
    assert_that(compute_nodes).is_length(1)
    root_volume_id = get_root_volume_id(compute_nodes[0], cluster.region, os)
    return get_tags_for_volume(root_volume_id, cluster.region)
Return the given cluster's compute node's root volume's tags.
def get_compute_node_root_volume_tags(cluster, os):
    
    compute_nodes = cluster.get_cluster_instance_ids(node_type='Compute')
    assert_that(compute_nodes).is_length(1)
    root_volume_id = get_root_volume_id(compute_nodes[0], cluster.region, os)
    return get_tags_for_volume(root_volume_id, cluster.region)