feat(updater): support updates after verified SeaweedFS migration

scripts/selfhost-update-service.py

@@ -54,8 +54,10 @@ def identifier(value):
 def public_state(state):
     """An allowlist, never raw command logs, exceptions, host paths, config or diff contents."""
     result = {"status": state.get("status") if state.get("status") in STATUSES else "idle"}
-    if state.get("phase") in PHASES:
-        result["phase"] = state["phase"]
+    # Host tools are installed before the application update; old backend enums must still parse us.
+    phase = {"checking_storage": "validating", "storage_adopted": "resolved"}.get(state.get("phase"), state.get("phase"))
+    if phase in PHASES:
+        result["phase"] = phase
     for key in ("recoveryRequired", "maintenance", "mutationStarted"):
         if key in state:
             result[key] = bool(state[key])
@@ -81,6 +83,9 @@ def public_plan(plan):
     if type(plan.get("estimatedBackupBytes")) is int:
         result["estimatedBackupBytes"] = plan["estimatedBackupBytes"]
     result["retiredServices"] = sorted(set(plan.get("retiredServices", [])) & engine.LEGACY_MATRIX_SERVICES)
+    if plan.get("storageProvider") in ("minio", "seaweedfs"):
+        result["storageProvider"] = plan["storageProvider"]
+        result["storageImageRetained"] = plan.get("storageImageRetained") is True
     return result
 
 
@@ -254,6 +259,11 @@ class Controller:
         installed = engine.read_json(updater.home / "installed.json", {}).get("manifest", {})
         result["installed"] = {k: v for k, v in public_state({"version": installed.get("version"),
                               "revision": installed.get("commit")}).items() if k != "status"}
+        storage = engine.read_json(updater.home / "storage-provider.json", {})
+        migration = engine.read_json(updater.home / "storage-migration/state.json", {})
+        if storage.get("provider") == "seaweedfs" or migration.get("writesReleased"):
+            result["storage"] = {"provider": "seaweedfs",
+                                 "migrationPending": engine.read_json(updater.home / "status.json", {}).get("phase") == "storage_migration"}
         if self.active:
             result["request"] = self.request_status(self.active)
         return result