do not build entire k8s for test

Author: Hantao (Will) Wang

test/k8s-integration/main.go

@@ -189,7 +189,7 @@ func handle() error {
 		if err != nil {
 			return fmt.Errorf("failed to download Kubernetes source: %v", err)
 		}
-		err = buildKubernetes(k8sDir)
+		err = buildKubernetes(k8sDir, "quick-release")
 		if err != nil {
 			return fmt.Errorf("failed to build Kubernetes: %v", err)
 		}
@@ -200,12 +200,11 @@ func handle() error {
 	// If test version is set, then download and build Kubernetes to run K8s tests
 	// Otherwise, either kube version is set (which implies GCE) or a local K8s dir is being used
 	if len(*testVersion) != 0 && *testVersion != *kubeVersion {
-		// TODO: Build only the tests
 		err := downloadKubernetesSource(pkgDir, testParentDir, *testVersion)
 		if err != nil {
 			return fmt.Errorf("failed to download Kubernetes source: %v", err)
 		}
-		err = buildKubernetes(testDir)
+		err = buildKubernetes(testDir, "WHAT=test/e2e/e2e.test")
 		if err != nil {
 			return fmt.Errorf("failed to build Kubernetes: %v", err)
 		}
@@ -378,8 +377,8 @@ func clusterDownGKE(gceZone string) error {
 	return nil
 }
 
-func buildKubernetes(k8sDir string) error {
-	cmd := exec.Command("make", "-C", k8sDir, "quick-release")
+func buildKubernetes(k8sDir, command string) error {
+	cmd := exec.Command("make", "-C", k8sDir, command)
 	err := runCommand("Building Kubernetes", cmd)
 	if err != nil {
 		return fmt.Errorf("failed to build Kubernetes: %v", err)