Add dedicated version update refresh for main components (#5833)

* Add dedicated update information reload

Currently we have the /refresh_updates endpoint which updates the main
component versions (Core, OS, Supervisor, Plug-ins) and the add-on
store at the same time. This combined update causes more update
information reloads than necessary.

To allow fine grained update refresh control introduce a new endpoint
/reload_updates which asks Supervisor to only update main component
versions (learned through the version json files).

The /store/reload endpoint already allows to update the add-on store
separately.

* Add pytest

* Update supervisor/api/__init__.py

supervisor/api/__init__.py

@@ -345,6 +345,9 @@ class RestAPI(CoreSysAttributes):
         api_root.coresys = self.coresys
 
         self.webapp.add_routes([web.get("/info", api_root.info)])
+        self.webapp.add_routes([web.post("/reload_updates", api_root.reload_updates)])
+
+        # Discouraged
         self.webapp.add_routes([web.post("/refresh_updates", api_root.refresh_updates)])
         self.webapp.add_routes(
             [web.get("/available_updates", api_root.available_updates)]

supervisor/api/root.py

@@ -113,3 +113,8 @@ class APIRoot(CoreSysAttributes):
         await asyncio.shield(
             asyncio.gather(self.sys_updater.reload(), self.sys_store.reload())
         )
+
+    @api_process
+    async def reload_updates(self, request: web.Request) -> None:
+        """Refresh updater update information."""
+        await self.sys_updater.reload()

tests/api/test_root.py

@@ -1,7 +1,9 @@
 """Test Supervisor API."""
 
 # pylint: disable=protected-access
-from unittest.mock import AsyncMock
+from unittest.mock import AsyncMock, patch
+
+from aiohttp.test_utils import TestClient
 
 from supervisor.api.const import ATTR_AVAILABLE_UPDATES
 from supervisor.coresys import CoreSys
@@ -78,3 +80,18 @@ async def test_api_refresh_updates(api_client, coresys: CoreSys):
 
     assert coresys.updater.reload.called
     assert coresys.store.reload.called
+
+
+async def test_api_reload_updates(
+    coresys: CoreSys,
+    api_client: TestClient,
+):
+    """Test reload updates."""
+    with (
+        patch("supervisor.updater.Updater.fetch_data") as fetch_data,
+    ):
+        resp = await api_client.post("/reload_updates")
+
+        fetch_data.assert_called_once_with()
+
+    assert resp.status == 200