Set Healthz to Return Error if Chain Has Not Yet Started (#7077)

* healthz in sync when chain not started
* Merge refs/heads/master into fix-healthz-when-process-deposits
* Merge refs/heads/master into fix-healthz-when-process-deposits
* Merge refs/heads/master into fix-healthz-when-process-deposits

beacon-chain/sync/service.go

@@ -174,16 +174,17 @@ func (s *Service) Stop() error {
 
 // Status of the currently running regular sync service.
 func (s *Service) Status() error {
-	if s.chainStarted {
-		if s.initialSync.Syncing() {
-			return errors.New("waiting for initial sync")
-		}
-		// If our head slot is on a previous epoch and our peers are reporting their head block are
-		// in the most recent epoch, then we might be out of sync.
-		if headEpoch := helpers.SlotToEpoch(s.chain.HeadSlot()); headEpoch+1 < helpers.SlotToEpoch(s.chain.CurrentSlot()) &&
-			headEpoch+1 < s.p2p.Peers().HighestEpoch() {
-			return errors.New("out of sync")
-		}
+	if !s.chainStarted {
+		return errors.New("chain not yet started")
+	}
+	if s.initialSync.Syncing() {
+		return errors.New("waiting for initial sync")
+	}
+	// If our head slot is on a previous epoch and our peers are reporting their head block are
+	// in the most recent epoch, then we might be out of sync.
+	if headEpoch := helpers.SlotToEpoch(s.chain.HeadSlot()); headEpoch+1 < helpers.SlotToEpoch(s.chain.CurrentSlot()) &&
+		headEpoch+1 < s.p2p.Peers().HighestEpoch() {
+		return errors.New("out of sync")
 	}
 	return nil
 }