make extra fields hint configurable

don't warn for AzureRunnerSettings
and CondaBuildConfig

conda_smithy/data/conda-forge.json

@@ -838,6 +838,7 @@
       "type": "object"
     },
     "build_platform": {
+      "additionalProperties": true,
       "properties": {
         "emscripten_wasm32": {
           "anyOf": [
@@ -1042,6 +1043,7 @@
       "type": "object"
     },
     "os_version": {
+      "additionalProperties": true,
       "properties": {
         "linux_32": {
           "anyOf": [
@@ -1183,6 +1185,7 @@
       "type": "object"
     },
     "provider": {
+      "additionalProperties": true,
       "properties": {
         "linux": {
           "anyOf": [

conda_smithy/lint_recipe.py

@@ -5,7 +5,7 @@
 
 from pydantic import BaseModel
 
-from conda_smithy.schema import ConfigModel
+from conda_smithy.schema import ConfigModel, NoExtraFieldsHint
 
 str_type = str
 
@@ -163,8 +163,12 @@ def _forge_yaml_hint_extra_fields(forge_yaml: dict) -> List[str]:
     hints = []
 
     def _find_extra_fields(model: BaseModel, prefix=""):
-        for extra_field in (model.__pydantic_extra__ or {}).keys():
-            hints.append(f"Unexpected key {prefix + extra_field}")
+        if not (
+            isinstance(model, NoExtraFieldsHint)
+            and not model.HINT_EXTRA_FIELDS
+        ):
+            for extra_field in (model.__pydantic_extra__ or {}).keys():
+                hints.append(f"Unexpected key {prefix + extra_field}")
 
         for field, value in model:
             if isinstance(value, BaseModel):

conda_smithy/schema.py

@@ -22,13 +22,31 @@
     CONDA_FORGE_YAML_SCHEMA_FILE,
 )
 
+"""
+Note: By default, we generate hints about additional fields the user added to the model
+if extra="allow" is set. This can be disabled by inheriting from the NoExtraFieldsHint class
+next to BaseModel.
+
+If adding new fields, you should decide between extra="forbid" and extra="allow", since
+extra="ignore" (the default) will not generate hints about additional fields.
+"""
+
 
 class Nullable(Enum):
     """Created to avoid issue with schema validation of null values in lists or dicts."""
 
     null = None
 
 
+class NoExtraFieldsHint:
+    """
+    Inherit from this class next to BaseModel to disable hinting about extra fields, even
+    if the model has `ConfigDict(extra="allow")`.
+    """
+
+    HINT_EXTRA_FIELDS = False
+
+
 #############################################
 ######## Choices (Enum/Literals) definitions #########
 #############################################
@@ -92,7 +110,7 @@ class BotConfigVersionUpdatesSourcesChoice(StrEnum):
 ##############################################
 
 
-class AzureRunnerSettings(BaseModel):
+class AzureRunnerSettings(BaseModel, NoExtraFieldsHint):
     """This is the settings for runners."""
 
     model_config: ConfigDict = ConfigDict(extra="allow")
@@ -383,7 +401,7 @@ class BotConfig(BaseModel):
     )
 
 
-class CondaBuildConfig(BaseModel):
+class CondaBuildConfig(BaseModel, NoExtraFieldsHint):
     model_config: ConfigDict = ConfigDict(extra="allow")
 
     pkg_format: Optional[Literal["tar", 1, 2, "1", "2"]] = Field(