_output_files is not defined with func_to_container_op

[knkski]

What happened:

I compiled a pipeline with func_to_container_op, and didn't specify any outputs, since there aren't any. It then failed with NameError: name '_output_files' is not defined

What did you expect to happen:

I expected the pipeline step to work without having to specify an output.

What steps did you take:

Here's the function that I'm converting to a container op:

def ensure_bucket_task(endpoint: str, bucket: str):
    from minio import Minio
    from minio.error import BucketAlreadyOwnedByYou, BucketAlreadyExists

    mclient = Minio(
        endpoint,
        access_key=...,
        secret_key=...,
    )

    try:
        mclient.make_bucket(bucket)
    except (BucketAlreadyExists, BucketAlreadyOwnedByYou):
        pass

There isn't anything useful to return, since the bucket name is parameterized in the workflow parameters.

Anything else you would like to add:

This is the relevant bit from the auto-generated wrapper that is failing:

for idx, filename in enumerate(_output_files):
    _output_path = Path(filename)
    _output_path.parent.mkdir(parents=True, exist_ok=True)
    _output_path.write_text(str(_outputs[idx]))

I can fix this issue by specifying a return value. Even something like -> str and not returning anything works, but it would be nice to avoid unnecessary boilerplate.

[Ark-kun]

I'm sorry you got bitten by this bug.
It was fixed in #1726
Please run pip3 install kfp --upgrade to update your SDK.