Implement catalog startup diagnostics (T-616)

app-modern/cmd/softbox/main.go

@@ -35,6 +35,10 @@ func main() {
 }
 
 func run() error {
+	return runWithCatalogLoader(application.UnconfiguredCatalogLoader{})
+}
+
+func runWithCatalogLoader(loader application.CatalogSnapshotLoader) error {
 	platform := windows.New()
 	window := new(app.Window)
 	window.Option(
@@ -59,10 +63,18 @@ func run() error {
 			window.Invalidate,
 		)
 	}()
+	catalogDone := startCatalogBootstrap(eventContext, runtime, loader)
 	defer func() {
 		cancelEvents()
 		runtime.Close()
 		relay.Close()
+		if bootstrapErr := <-catalogDone; bootstrapErr != nil &&
+			!errors.Is(bootstrapErr, context.Canceled) &&
+			!errors.Is(bootstrapErr, application.ErrCatalogSourceUnconfigured) &&
+			!errors.Is(bootstrapErr, application.ErrRuntimeClosed) &&
+			!errors.Is(bootstrapErr, application.ErrEventRelayClosed) {
+			log.Printf("%s catalog bootstrap failed", core.ProductName)
+		}
 		if pumpErr := <-pumpDone; pumpErr != nil &&
 			!errors.Is(pumpErr, context.Canceled) &&
 			!errors.Is(pumpErr, application.ErrEventRelayClosed) {
@@ -85,3 +97,15 @@ func run() error {
 		}
 	}
 }
+
+func startCatalogBootstrap(
+	ctx context.Context,
+	runtime *application.Runtime,
+	loader application.CatalogSnapshotLoader,
+) <-chan error {
+	done := make(chan error, 1)
+	go func() {
+		done <- application.NewCatalogBootstrap(loader, runtime).Run(ctx)
+	}()
+	return done
+}