Move test for node schedulability

Test for schedulability immediately prior to each reboot check instead
of once at startup, thereby accomodating external changes to this value
during the lifetime of the daemon.

cmd/kured/main.go

@@ -220,24 +220,26 @@ func root(cmd *cobra.Command, args []string) {
 			uncordon(nodeID)
 		}
 		release(lock)
-	} else {
-		node, err := client.CoreV1().Nodes().Get(nodeID)
-		if err != nil {
-			log.Fatal(err)
-		}
-		nodeMeta.Unschedulable = node.Spec.Unschedulable
 	}
 
 	source := rand.NewSource(time.Now().UnixNano())
 	tick := delaytick.New(source, time.Minute*time.Duration(period))
 	for _ = range tick {
-		if rebootRequired() && !rebootBlocked() && acquire(lock, &nodeMeta) {
-			if !nodeMeta.Unschedulable {
-				drain(nodeID)
-				waitForDrain(client, nodeID)
+		if rebootRequired() && !rebootBlocked() {
+			node, err := client.CoreV1().Nodes().Get(nodeID)
+			if err != nil {
+				log.Fatal(err)
+			}
+			nodeMeta.Unschedulable = node.Spec.Unschedulable
+
+			if acquire(lock, &nodeMeta) {
+				if !nodeMeta.Unschedulable {
+					drain(nodeID)
+					waitForDrain(client, nodeID)
+				}
+				reboot()
+				break
 			}
-			reboot()
-			break
 		}
 	}