ruff format --check Fails on Ubuntu

[MelbourneDeveloper]

I am working on macOS, and I use GitHub Actions. I run this in the pipeline:

ruff format --check .

It passes on Mac, but fails in Ubuntu. This is what I get:

ruff format --check .
Would reformat: ai_coding_agent/tests/test_api_e2e.py
Would reformat: ai_coding_agent/tests/test_devagent.py
Would reformat: ai_coding_agent/tests/test_devagent_e2e.py
3 files would be reformatted, 34 files already formatted

Three files in particular are not formatted the same way. The rest are fine,. I would guess that this a line ending issue, but I've tried changing git attributes etc. and nothing seemed to make any difference. I've tried hard refreshing these files and also I tried running this on Ubuntu before running the formatting check:

find . -name "*.py" -type f -exec perl -pi -e 's/\r\n|\r/\n/g' {} +

Nothing seems to make any difference.

I couldn't see any specific config for line endings in the documentation here.

[zanieb]

Can you share a reproducible example? i.e. host the file somewhere?

[MelbourneDeveloper]

@zanieb unfortunately, I can't. However, I have been able to reproduce the problem locally on my Mac, and it's totally bizarre.

When I run this script:

#!/bin/bash

set -e

source venv/bin/activate

ruff format --check .

I get this:

Would reformat: ai_coding_agent/tests/test_api_e2e.py
Would reformat: ai_coding_agent/tests/test_devagent.py
Would reformat: ai_coding_agent/tests/test_devagent_e2e.py
Would reformat: ai_coding_agent/tests/test_devagent_mocks.py
Would reformat: ai_coding_agent/tests/test_devagent_unit.py
5 files would be reformatted, 34 files already formatted

If I remove or delete the activation beforehand, the format check passes

#!/bin/bash

set -e

ruff format --check .

39 files already formatted

[zanieb]

When you activate the environment are you getting a different version of Ruff? e.g., which ruff / ruff version in both examples? Are you using the same Python version?