Cleanup k8s states after upgrade

clitools/pkg/node/fs.go

@@ -29,6 +29,31 @@ func ReleaseControlGate(ctx context.Context, nctx *NodeContext) error {
 		return fmt.Errorf("relate control gate: %w", err)
 	}
 
+	return WriteLastState(ctx, nctx)
+}
+
+// Required for detecting bootslot changes
+func WriteLastState(ctx context.Context, nctx *NodeContext) error {
+	stBootPart := filepath.Join(monov1alpha1.EnvConfigDir, ".bootpart")
+
+	state, err := osimage.ReadBootState()
+	if err != nil {
+		return fmt.Errorf("read boot state: %w", err)
+	}
+
+	bootPart := state["BOOT_PART"]
+	if bootPart == "" {
+		return fmt.Errorf("BOOT_PART missing")
+	}
+
+	tmp := stBootPart + ".tmp"
+	if err := os.WriteFile(tmp, []byte(bootPart+"\n"), 0o644); err != nil {
+		return err
+	}
+	if err := os.Rename(tmp, stBootPart); err != nil {
+		return err
+	}
+
 	return nil
 }