Do not add TCP to protocol in generated kube yaml

As the default protocol in k8s is TCP, don't add it
to the generate yaml when using protocol.
Add UDP to the protocol of the generated yaml when udp
is being used.
Add tests for this as well.

Signed-off-by: Urvashi Mohnani <umohnani@redhat.com>

libpod/kube.go

@@ -578,7 +578,8 @@ func ocicniPortMappingToContainerPort(portMappings []types.OCICNIPortMapping) ([
 		var protocol v1.Protocol
 		switch strings.ToUpper(p.Protocol) {
 		case "TCP":
-			protocol = v1.ProtocolTCP
+			// do nothing as it is the default protocol in k8s, there is no need to explicitly
+			// add it to the generated yaml
 		case "UDP":
 			protocol = v1.ProtocolUDP
 		default:

test/e2e/generate_kube_test.go

@@ -451,6 +451,10 @@ var _ = Describe("Podman generate kube", func() {
 		foundOtherPort := 0
 		for _, ctr := range pod.Spec.Containers {
 			for _, port := range ctr.Ports {
+				// Since we are using tcp here, the generated kube yaml shouldn't
+				// have anything for protocol under the ports as tcp is the default
+				// for k8s
+				Expect(port.Protocol).To(BeEmpty())
 				if port.HostPort == 4000 {
 					foundPort4000 = foundPort4000 + 1
 				} else if port.HostPort == 5000 {
@@ -463,6 +467,24 @@ var _ = Describe("Podman generate kube", func() {
 		Expect(foundPort4000).To(Equal(1))
 		Expect(foundPort5000).To(Equal(1))
 		Expect(foundOtherPort).To(Equal(0))
+
+		// Create container with UDP port and check the generated kube yaml
+		ctrWithUDP := podmanTest.Podman([]string{"create", "--pod", "new:test-pod", "-p", "6666:66/udp", ALPINE, "top"})
+		ctrWithUDP.WaitWithDefaultTimeout()
+		Expect(ctrWithUDP).Should(Exit(0))
+
+		kube = podmanTest.Podman([]string{"generate", "kube", "test-pod"})
+		kube.WaitWithDefaultTimeout()
+		Expect(kube).Should(Exit(0))
+
+		pod = new(v1.Pod)
+		err = yaml.Unmarshal(kube.Out.Contents(), pod)
+		Expect(err).To(BeNil())
+
+		containers := pod.Spec.Containers
+		Expect(len(containers)).To(Equal(1))
+		Expect(len(containers[0].Ports)).To(Equal(1))
+		Expect(containers[0].Ports[0].Protocol).To(Equal(v1.ProtocolUDP))
 	})
 
 	It("podman generate and reimport kube on pod", func() {