Allow running with incompatible yamllint config

Fixes: #4152

.pre-commit-config.yaml

@@ -162,8 +162,8 @@ repos:
           - pytest-mock
           - pytest>=7.2.2
           - rich>=13.2.0
-          - ruamel-yaml-clib>=0.2.7
-          - ruamel-yaml>=0.18.2
+          - ruamel-yaml-clib>=0.2.8
+          - ruamel-yaml>=0.18.6
           - subprocess-tee
           - types-PyYAML
           - types-jsonschema>=4.20.0.0

src/ansiblelint/__main__.py

@@ -373,7 +373,15 @@ def main(argv: list[str] | None = None) -> int:
             match.ignored = True
             _logger.debug("Ignored: %s", match)
 
+    if app.yamllint_config.incompatible:
+        logging.log(
+            level=logging.ERROR if options.write_list else logging.WARNING,
+            msg=app.yamllint_config.incompatible,
+        )
+
     if options.write_list:
+        if app.yamllint_config.incompatible:
+            sys.exit(RC.INVALID_CONFIG)
         fix(runtime_options=options, result=result, rules=rules)
 
     app.render_matches(result.matches)

src/ansiblelint/app.py

@@ -54,6 +54,12 @@ def __init__(self, options: Options):
             verbosity=options.verbosity,
         )
 
+        # if "ansiblelint.yaml_utils" not in sys.modules:
+        # pylint: disable=import-outside-toplevel
+        from ansiblelint.yaml_utils import load_yamllint_config  # noqa: 811,I001
+
+        self.yamllint_config = load_yamllint_config()
+
     def render_matches(self, matches: list[MatchError]) -> None:
         """Display given matches (if they are not fixed)."""
         matches = [match for match in matches if not match.fixed]

src/ansiblelint/yaml_utils.py

@@ -7,7 +7,6 @@
 import logging
 import os
 import re
-import sys
 from collections.abc import Callable, Iterator, Sequence
 from io import StringIO
 from pathlib import Path
@@ -31,7 +30,6 @@
     ANNOTATION_KEYS,
     NESTED_TASK_KEYS,
     PLAYBOOK_TASK_KEYWORDS,
-    RC,
 )
 from ansiblelint.utils import Task
 
@@ -48,6 +46,19 @@
 _logger = logging.getLogger(__name__)
 
 
+class CustomYamlLintConfig(YamlLintConfig):  # type: ignore[misc]
+    """Extension of YamlLintConfig."""
+
+    def __init__(
+        self,
+        content: str | None = None,
+        file: str | Path | None = None,
+    ) -> None:
+        """Initialize config."""
+        super().__init__(content, file)
+        self.incompatible = ""
+
+
 def deannotate(data: Any) -> Any:
     """Remove our annotations like __file__ and __line__ and return a JSON serializable object."""
     if isinstance(data, dict):
@@ -63,9 +74,10 @@ def deannotate(data: Any) -> Any:
     return data
 
 
-def load_yamllint_config() -> YamlLintConfig:
+def load_yamllint_config() -> CustomYamlLintConfig:
     """Load our default yamllint config and any customized override file."""
-    config = YamlLintConfig(file=Path(__file__).parent / "data" / ".yamllint")
+    config = CustomYamlLintConfig(file=Path(__file__).parent / "data" / ".yamllint")
+    config.incompatible = ""
     # if we detect local yamllint config we use it but raise a warning
     # as this is likely to get out of sync with our internal config.
     for path in [
@@ -82,7 +94,7 @@ def load_yamllint_config() -> YamlLintConfig:
                 "internal yamllint config.",
                 file,
             )
-            custom_config = YamlLintConfig(file=str(file))
+            custom_config = CustomYamlLintConfig(file=str(file))
             custom_config.extend(config)
             config = custom_config
             break
@@ -138,9 +150,8 @@ def load_yamllint_config() -> YamlLintConfig:
             errors.append(msg)
     if errors:
         nl = "\n"
-        msg = f"Found incompatible custom yamllint configuration ({file}), please either remove the file or edit it to comply with:{nl}  - {nl + '  - '.join(errors)}.{nl}{nl}Read https://ansible.readthedocs.io/projects/lint/rules/yaml/ for more details regarding why we have these requirements."
-        logging.fatal(msg)
-        sys.exit(RC.INVALID_CONFIG)
+        msg = f"Found incompatible custom yamllint configuration ({file}), please either remove the file or edit it to comply with:{nl}  - {(nl + '  - ').join(errors)}.{nl}{nl}Read https://ansible.readthedocs.io/projects/lint/rules/yaml/ for more details regarding why we have these requirements. Fix mode will not be available."
+        config.incompatible = msg
 
     _logger.debug("Effective yamllint rules used: %s", config.rules)
     return config

test/test_yaml_utils.py

@@ -12,7 +12,6 @@
 from yamllint.linter import run as run_yamllint
 
 import ansiblelint.yaml_utils
-from ansiblelint.constants import RC
 from ansiblelint.file_utils import Lintable, cwd
 from ansiblelint.utils import task_in_list
 
@@ -996,8 +995,6 @@ def test_deannotate(
 
 def test_yamllint_incompatible_config() -> None:
     """Ensure we can detect incompatible yamllint settings."""
-    with (
-        cwd(Path("examples/yamllint/incompatible-config")),
-        pytest.raises(SystemExit, match=f"^{RC.INVALID_CONFIG}$"),
-    ):
-        ansiblelint.yaml_utils.load_yamllint_config()
+    with (cwd(Path("examples/yamllint/incompatible-config")),):
+        config = ansiblelint.yaml_utils.load_yamllint_config()
+        assert config.incompatible