hassfest detect built-in domain override for custom integrations (#49845)

script/hassfest/manifest.py

@@ -1,6 +1,7 @@
 """Manifest validation."""
 from __future__ import annotations
 
+from pathlib import Path
 from urllib.parse import urlparse
 
 import voluptuous as vol
@@ -8,7 +9,7 @@ from voluptuous.humanize import humanize_error
 
 from homeassistant.loader import validate_custom_integration_version
 
-from .model import Integration
+from .model import Config, Integration
 
 DOCUMENTATION_URL_SCHEMA = "https"
 DOCUMENTATION_URL_HOST = "www.home-assistant.io"
@@ -227,7 +228,7 @@ def validate_version(integration: Integration):
         return
 
 
-def validate_manifest(integration: Integration):
+def validate_manifest(integration: Integration, core_components_dir: Path) -> None:
     """Validate manifest."""
     if not integration.manifest:
         return
@@ -245,6 +246,14 @@ def validate_manifest(integration: Integration):
     if integration.manifest["domain"] != integration.path.name:
         integration.add_error("manifest", "Domain does not match dir name")
 
+    if (
+        not integration.core
+        and (core_components_dir / integration.manifest["domain"]).exists()
+    ):
+        integration.add_warning(
+            "manifest", "Domain collides with built-in core integration"
+        )
+
     if (
         integration.manifest["domain"] in NO_IOT_CLASS
         and "iot_class" in integration.manifest
@@ -261,7 +270,8 @@ def validate_manifest(integration: Integration):
         validate_version(integration)
 
 
-def validate(integrations: dict[str, Integration], config):
+def validate(integrations: dict[str, Integration], config: Config) -> None:
     """Handle all integrations manifests."""
+    core_components_dir = config.root / "homeassistant/components"
     for integration in integrations.values():
-        validate_manifest(integration)
+        validate_manifest(integration, core_components_dir)

script/hassfest/model.py

@@ -100,7 +100,7 @@ class Integration:
         """Add an error."""
         self.errors.append(Error(*args, **kwargs))
 
-    def add_warning(self, *args, **kwargs):
+    def add_warning(self, *args: Any, **kwargs: Any) -> None:
         """Add an warning."""
         self.warnings.append(Error(*args, **kwargs))