Add self upgrade and notifications to updates module

updates/notify.go

@@ -0,0 +1,37 @@
+package updates
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/Safing/portbase/notifications"
+)
+
+var lastNotified time.Time
+
+func updateNotifier() {
+	time.Sleep(30 * time.Second)
+	for {
+
+		_, version, _, ok := getLatestFilePath(coreIdentifier)
+		if ok {
+			status.Lock()
+			liveVersion := status.Core.Version
+			status.Unlock()
+
+			if version != liveVersion {
+
+				// create notification
+				(&notifications.Notification{
+					ID:      "updates-core-update-available",
+					Message: fmt.Sprintf("There is an update available for the portmaster core (%s), you may apply the update with the -upgrade flag.", version),
+					Type:    notifications.Info,
+					Expires: time.Now().Add(1 * time.Minute).Unix(),
+				}).Init().Save()
+
+			}
+		}
+
+		time.Sleep(1 * time.Hour)
+	}
+}