An OpenFile carries an fsspec filesystem and path. On receiving such an argument we can dispatch to /vsipyopener/.

Usage example:

of = fsspec.open("dask::s3://bucket/key", s3={"anon": True})
with rasterio.open(of) as dataset:
    print(dataset.profile)

This works well with GDAL's VSI plugin callbacks because of, the fsspec OpenFile, doesn't have a file descriptor or socket or anything like that yet, not until we enter its context. It's so designed so that it can be serialized and passed between processes. Thus GDAL can open/activate it as many times as needed.