Don't overwrite existing files when generating configuration (#49815)

homeassistant/config.py

@@ -291,23 +291,28 @@ def _write_default_config(config_dir: str) -> bool:
         with open(config_path, "wt") as config_file:
             config_file.write(DEFAULT_CONFIG)
 
-        with open(secret_path, "wt") as secret_file:
-            secret_file.write(DEFAULT_SECRETS)
+        if not os.path.isfile(secret_path):
+            with open(secret_path, "wt") as secret_file:
+                secret_file.write(DEFAULT_SECRETS)
 
         with open(version_path, "wt") as version_file:
             version_file.write(__version__)
 
-        with open(group_yaml_path, "wt"):
-            pass
+        if not os.path.isfile(group_yaml_path):
+            with open(group_yaml_path, "wt"):
+                pass
 
-        with open(automation_yaml_path, "wt") as fil:
-            fil.write("[]")
+        if not os.path.isfile(automation_yaml_path):
+            with open(automation_yaml_path, "wt") as automation_file:
+                automation_file.write("[]")
 
-        with open(script_yaml_path, "wt"):
-            pass
+        if not os.path.isfile(script_yaml_path):
+            with open(script_yaml_path, "wt"):
+                pass
 
-        with open(scene_yaml_path, "wt"):
-            pass
+        if not os.path.isfile(scene_yaml_path):
+            with open(scene_yaml_path, "wt"):
+                pass
 
         return True
 

tests/test_config.py

@@ -115,6 +115,19 @@ async def test_ensure_config_exists_uses_existing_config(hass):
     assert content == ""
 
 
+async def test_ensure_existing_files_is_not_overwritten(hass):
+    """Test that calling async_create_default_config does not overwrite existing files."""
+    create_file(SECRET_PATH)
+
+    await config_util.async_create_default_config(hass)
+
+    with open(SECRET_PATH) as fp:
+        content = fp.read()
+
+    # File created with create_file are empty
+    assert content == ""
+
+
 def test_load_yaml_config_converts_empty_files_to_dict():
     """Test that loading an empty file returns an empty dict."""
     create_file(YAML_PATH)