Print cluster hash for GKE k8s integration tests

Change-Id: Id9befb7508b785ed1fe96efff48c5fa84a6f1d1a

Author: mattcary

test/k8s-integration/cluster.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bufio"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -268,6 +269,26 @@ func clusterUpGKE(gceZone, gceRegion string, numNodes int, numWindowsNodes int,
 		}
 	}
 
+	cmd = exec.Command("gcloud", "container", "clusters", "describe", *gkeTestClusterName, locationArg, locationVal)
+	out, err = cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("failed to list cluster: %v %s", err, out)
+	}
+	scanner := bufio.NewScanner(strings.NewReader(string(out)))
+	printedHash := false
+	for scanner.Scan() {
+		line := scanner.Text()
+		if strings.HasPrefix(line, "id: ") {
+			klog.Infof("GKE cluster: %s %s", *gkeTestClusterName, locationVal)
+			klog.Infof("GKE cluster hash %s", line)
+			printedHash = true
+			break
+		}
+	}
+	if !printedHash {
+		return fmt.Errorf("failed to find cluster hash in cluster describe: %s", out)
+	}
+
 	return nil
 }