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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def dump_artifacts(kwargs):
    '''
    Introspect the kwargs and dump objects to disk
    '''
    private_data_dir = kwargs.get('private_data_dir')
    if not private_data_dir:
        private_data_dir = tempfile.mkdtemp()
        kwargs['private_data_dir'] = private_data_dir

    if not os.path.exists(private_data_dir):
        raise ValueError('private_data_dir path is either invalid or does not exist')

    if 'role' in kwargs:
        role = {'name': kwargs.pop('role')}
        if 'role_vars' in kwargs:
            role['vars'] = kwargs.pop('role_vars')

        play = [{'hosts': kwargs.pop('hosts', 'all'), 'roles': [role]}]

        if kwargs.pop('role_skip_facts', False):
            play[0]['gather_facts'] = False

        kwargs['playbook'] = play

        if 'envvars' not in kwargs:
            kwargs['envvars'] = {}

        roles_path = kwargs.pop('roles_path', None)
        if not roles_path:
            roles_path = os.path.join(private_data_dir, 'roles')
        else:
            roles_path += ':{}'.format(os.path.join(private_data_dir, 'roles'))

        kwargs['envvars']['ANSIBLE_ROLES_PATH'] = roles_path

    obj = kwargs.get('playbook')
    if obj and isplaybook(obj):
        path = os.path.join(private_data_dir, 'project')
        kwargs['playbook'] = dump_artifact(json.dumps(obj), path, 'main.json')

    obj = kwargs.get('inventory')
    if obj and isinventory(obj):
        path = os.path.join(private_data_dir, 'inventory')
        if isinstance(obj, Mapping):
            kwargs['inventory'] = dump_artifact(json.dumps(obj), path, 'hosts.json')
        elif isinstance(obj, string_types):
            if not os.path.exists(obj):
                kwargs['inventory'] = dump_artifact(obj, path, 'hosts')

    for key in ('envvars', 'extravars', 'passwords', 'settings'):
        obj = kwargs.get(key)
        if obj and not os.path.exists(os.path.join(private_data_dir, 'env', key)):
            path = os.path.join(private_data_dir, 'env')
            dump_artifact(json.dumps(obj), path, key)
            kwargs.pop(key)

    for key in ('ssh_key', 'cmdline'):
        obj = kwargs.get(key)
        if obj and not os.path.exists(os.path.join(private_data_dir, 'env', key)):
            path = os.path.join(private_data_dir, 'env')
            dump_artifact(str(kwargs[key]), path, key)
            kwargs.pop(key)