import yaml

def write_default_config(disk, global_params):
    default_params = dict()
    for k in [
            'task_name',
            'username',
            'task_url']:
        if k in global_params:
            default_params[k] = global_params[k]
    disk.write('/home/tester/.kpov_params.yaml', yaml.dump(default_params))
    disk.chown(1001, 1001, "/home/tester/.kpov_params.yaml")