Ruff format/fix on save not working in devcontainer until after window reload

[eschnitzler]

I am encountering an issue with the Ruff VSCode extension where the autofix on save feature does not work initially when using a devcontainer. The feature only starts working after I reload the VSCode window.

Steps to Reproduce:

1. Open a project in a VSCode devcontainer.
2. Ensure that the recommended settings are configured in devcontainer.json:

   "[python]": {
                    "editor.formatOnSave": true,
                    "editor.codeActionsOnSave": {
                        "source.fixAll": "explicit",
                        "source.organizeImports": "explicit"
                    },
                    "editor.defaultFormatter": "charliermarsh.ruff"
                }
   

3. Make an auto-fixable linting error in a python file and try to save it.

Expected Behavior: The Ruff extension should automatically format and fix issues on save without needing to reload the VSCode window first.

Additional Information:

VSCode Version: 1.90.2 Ruff Extension Version: v2024.28.0 Operating System: Pop_Os 22.04

[PerMildner]

I see the same thing happening (settings specified via [python] ... in devcontainer.json not taking effect until after detach+reattach to dev container) for editor.rulers. So, my guess would be a bug in the VSCode dev-container plugin, not in ruff-vscode.

(I think I also saw this happening for editor.formatOnSave, like this issue reports)

[dhruvmanila]

Can you provide some additional information?

1. Any ruff.* scoped settings if set
2. Content of the Ruff configuration is it's being used (pyproject.toml, ruff.toml, etc.)

Do you face this issue when using VS Code locally (not inside devcontainer)?

[PerMildner]

I am not sure whether "you" is referring to me or the original poster @eschnitzler but I will leave the keyboard for several weeks within minutes, so I will not be able to investigate this.

[dhruvmanila]

Sorry for the confusion. I'm referring to the issue author @eschnitzler

[eschnitzler]

@dhruvmanila Here are my ruff configured settings in my pyproject.toml file:

[tool.ruff]
exclude = [
    ".git",
    ".pytest_cache",
    ".ruff_cache",
    ".venv",
    ".vscode",
    "__pypackages__",
    "_build",
    "build",
    "dist",
    "node_modules",
    "site-packages",
    "venv",
]
line-length = 105
indent-width = 4

[tool.ruff.lint]
select = [
    "B",  # flake8-bugbear
    "C4", # flake8-comprehensions
    "E",  # Error (pycodesyle)
    "W",  # Warning (pycodesyle)
    "F",  # pyflakes
    "I",  # isort
    "ISC", # flake8-implicit-str-concat
    "PGH",  # pygrep-hooks
    "Q",  # flake8-quotes
    "DJ", # flake8-django
    "SIM",  # flake8-simplify
    "UP",  # pyupgrade
    "C4", # flake8-comprehensions
    "T10", # flake8-debugger
    "PT", # flake8-ptest-style
    "C90", # flake8-mccabe
]
ignore = [
    "W191",  # Indentation contains tabs
    "E111",  # Indentation is not a multiple of four
    "E114",  # Indentation is not a multiple of four (comment)
    "E117",  # Over-indented
    "E501",  # Line too long
    "Q000",  # Remove bad quotes (inline)
    "Q001",  # Remove bad quotes (multiline)
    "Q002",  # Remove bad quotes (docstring)
    "Q003",  # Remove avoidable escaped quote
    "ISC001",  # Implicit string concatenation (single-line)
    "ISC002",  # Implicit string concatenation (multi-line)
    "B026", # Star-arg unpacking after a keyword argument is strongly discouraged
    "B904", # 'assertRaises' should be used as a context manager
    "DJ001" # Avoid using null=True on string-based fields such as CharField and TextField
]

[tool.ruff.lint.per-file-ignores]
"**/tests/**" = ["C90"]


[tool.ruff.format]
docstring-code-format = true
exclude = [
    "app/migrations/**",
]

[tool.ruff.lint.mccabe]
max-complexity = 15

The issue only occurs when inside a devcontainer.

[andreaspasternakdd]

I have the same problem, but reloading VS code does not seem to fix the issue for me.

[claco]

I have the same issue. No ruff config, just the extension loaded in a vscode devcontainer. Seems to happen if I save with a bad python file (aka, in the middle of typing or refactoring). A window reload does fix it for me.

[MichaReiser]

Interesting. This sounds somewhat familiar to https://github.com/astral-sh/ruff-vscode/issues/654#issuecomment-2561279579

Could you try following the instructions in that thread and share the ruff logs, the status of the server, and if you see any errors in the Extension Host output panel?