import os
import yaml

def write_default_config(disk, global_params):
    home = '/home/tester'
    params_file = os.path.join(home, '.kpov_params.yaml')
    default_params = {}
    for k in [
            'task_name',
            'username',
            'task_url']:
        if k in global_params:
            default_params[k] = global_params[k]
    disk.write(params_file, yaml.dump(default_params))
    disk.chown(1001, 1001, params_file)

    # write testing script and helper
    for f in ['test_task.py', 'kpov_util.py']:
        src = os.path.join(os.path.dirname(os.path.abspath(__file__)), f)
        dst = os.path.join('/home/tester', f)
        disk.write(dst, open(src).read())
        disk.chown(1001, 1001, dst)