return exit code on failure

cmd/cluster_create.go

@@ -95,6 +95,7 @@ tks cluster create <CLUSTERNAME>`,
 		fmt.Println("Response:\n", r)
 		if err != nil {
 			fmt.Println("Error:", err)
+			os.Exit(1)
 		} else {
 			fmt.Println("Success: The request to create cluster ", args[0], " was accepted.")
 		}

cmd/cluster_delete.go

@@ -76,6 +76,7 @@ tks cluster delete <CLUSTER_ID>`,
 		fmt.Println(r)
 		if err != nil {
 			fmt.Println(err)
+			os.Exit(1)
 		} else {
 			fmt.Println("The request to delete cluster ", args[0], " was accepted.")
 		}

cmd/cluster_list.go

@@ -73,6 +73,7 @@ tks cluster list (--long)`,
 		r, err := client.GetClusters(ctx, &data)
 		if err != nil {
 			fmt.Println(err)
+			os.Exit(1)
 		} else {
 			if len(r.Clusters) == 0 {
 				fmt.Println("No cluster exists for specified contract!")

cmd/cluster_show.go

@@ -75,6 +75,7 @@ tks cluster show <CLUSTER_ID>`,
 		r, err := client.GetCluster(ctx, &data)
 		if err != nil {
 			fmt.Println(err)
+			os.Exit(1)
 		} else {
 			printCluster(r)
 		}

cmd/service_create.go

@@ -100,6 +100,7 @@ tks service create --cluster-id <CLUSTERID> --service-name <LMA,LMA_EFK,SERVICE_
 		fmt.Println("Response:\n", r)
 		if err != nil {
 			fmt.Println("Error:", err)
+			os.Exit(1)
 		} else {
 			fmt.Println("Success: The request to create service ", AppGroupName, " was accepted.")
 		}

cmd/service_delete.go

@@ -78,6 +78,7 @@ tks service delete <SERVICE ID>`,
 		r, err := client.UninstallAppGroups(ctx, &data)
 		if err != nil {
 			fmt.Println(err)
+			os.Exit(1)
 		} else {
 			fmt.Println(r)
 		}

cmd/service_list.go

@@ -79,6 +79,7 @@ tks service list <CLUSTER ID> (--long)`,
 		r, err := client.GetAppGroupsByClusterID(ctx, &data)
 		if err != nil {
 			fmt.Println(err)
+			os.Exit(1)
 		} else {
 			long, _ := cmd.Flags().GetBool("long")
 			printAppGroups(r, long)