Add test

Signed-off-by: terasihma <[email protected]>

v2/e2e/coil_test.go

@@ -368,6 +368,10 @@ var _ = Describe("Coil", func() {
 			Expect(resp).To(HaveLen(1 << 20))
 		}
 
+		By("creating a dummy pod don't use egress")
+		// dummy_pod must be created after creating a net-client pod
+		kubectlSafe(nil, "apply", "-f", "manifests/dummy_pod.yaml")
+
 		By("updating Egress in the internet namespace")
 		kubectlSafe(nil, "apply", "-f", "manifests/egress-updated.yaml")
 
@@ -446,6 +450,20 @@ var _ = Describe("Coil", func() {
 			return nil
 		}).Should(Succeed())
 
+		By("confirming that the fou device must be one in dummy_pod")
+		out, err := kubectl(nil, "exec", "dummy", "--", "ip", "-j", "link", "show")
+		Expect(err).NotTo(HaveOccurred())
+		var dummyPodLinks []link
+		err = json.Unmarshal(out, &dummyPodLinks)
+		Expect(err).NotTo(HaveOccurred())
+		fouCount := 0
+		for _, l := range dummyPodLinks {
+			if strings.HasPrefix(l.Ifname, "fou") && l.Ifname != "fou-dummy" {
+				fouCount += 1
+			}
+		}
+		Expect(fouCount).To(Equal(1))
+
 		By("sending and receiving HTTP request from nat-client")
 		data = make([]byte, 1<<20) // 1 MiB
 		resp = kubectlSafe(data, "exec", "-i", "nat-client", "--", "curl", "-sf", "-T", "-", fakeURL)

v2/e2e/manifests/dummy_pod.yaml

@@ -0,0 +1,18 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: dummy 
+  namespace: default
+  annotations:
+    egress.coil.cybozu.com/internet: egress-sport-auto
+spec:
+  tolerations:
+  - key: test
+    operator: Exists
+  nodeSelector:
+    test: coil
+    kubernetes.io/hostname: coil-worker
+  containers:
+  - name: ubuntu
+    image: quay.io/cybozu/ubuntu-debug:22.04
+    command: ["pause"]

v2/e2e/manifests/nat-client.yaml

@@ -11,6 +11,7 @@ spec:
     operator: Exists
   nodeSelector:
     test: coil
+    kubernetes.io/hostname: coil-worker
   containers:
   - name: ubuntu
     image: quay.io/cybozu/ubuntu-debug:22.04

v2/pkg/nodenet/pod_test.go

@@ -291,7 +291,10 @@ func TestPodNetwork(t *testing.T) {
 		t.Error("config for pod3 not found")
 	}
 
-	// confirm to select the expected pod
+	// This test is for https://github.com/cybozu-go/coil/pull/265.
+	// Confirm to select the expected pod.
+	// In this test, the address in podConf is equal to the address in the hook function.
+	// The hook function is executed inside the pod's network namespace.
 	type addrInfo struct {
 		Family string `json:"family"`
 		Local  string `json:"local"`