Issues in a readonly filesystem

[RossHammer]

What happens?

In a readonly filesystem, in our case we have docker mounted as readonly, when importing splink it crashes trying to create __splinkdata_cache__

To Reproduce

In a docker image with splink installed the following command fails
docker run --rm --read-only test python -c 'import splink'

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/local/lib/python3.12/site-packages/splink/__init__.py", line 5, in <module>
    from splink.internals.datasets import splink_datasets
  File "/usr/local/lib/python3.12/site-packages/splink/internals/datasets/__init__.py", line 270, in <module>
    class _SplinkDataSets(metaclass=_SplinkDataSetsMeta, datasets=_datasets):
  File "/usr/local/lib/python3.12/site-packages/splink/internals/datasets/__init__.py", line 152, in __new__
    cls.cache_dir.mkdir(exist_ok=True)
  File "/usr/local/lib/python3.12/pathlib.py", line 1311, in mkdir
    os.mkdir(self, mode)
OSError: [Errno 30] Read-only file system: '/usr/local/lib/python3.12/site-packages/splink/internals/datasets/__splinkdata_cache__'

OS:

linux

Splink version:

4.0.0

Have you tried this on the latest master branch?

• I agree

Have you tried the steps to reproduce? Do they include all relevant data and configuration? Does the issue you report still appear there?

• I agree