Adds nfsv4 PVC scenario to the integration test (#30)

The longhorn-share-manager rock is currently untested because it's not
needed for ReadWriteOnce PVCs (ext4 volumes).

The integration test now also creates a Pod with a ReadWriteMany PVC,
which will result in a nfsv4 mount, which will require the
longhorn-share-manager rock to work properly.

tests/integration/test_longhorn_in_helm_chart.py

@@ -187,33 +187,39 @@ def test_longhorn_helm_chart_deployment(
     # Wait for Longhorn to become active,
     _wait_for_longhorn(function_instance)
 
-    # Deploy an nginx Pod with a PVC, which should be satisfied by Longhorn.
-    function_instance.exec(
-        ["k8s", "kubectl", "apply", "-f", "-"],
-        input=pathlib.Path(TEMPLATES_DIR / "nginx-pod.yaml").read_bytes(),
-    )
+    # Deploy nginx Pods with PVCs, which should be satisfied by Longhorn.
+    for yaml_file in ["nginx-pod.yaml", "nginx-nfs-pod.yaml"]:
+        function_instance.exec(
+            ["k8s", "kubectl", "apply", "-f", "-"],
+            input=pathlib.Path(TEMPLATES_DIR / yaml_file).read_bytes(),
+        )
 
-    # Expect the Pod to become ready, and that it has the volume attached.
-    k8s_util.wait_for_resource(
-        function_instance,
-        "pod",
-        "nginx-longhorn-example",
-        condition=constants.K8S_CONDITION_READY,
-    )
+    # Expect the Pods to become ready, and that they have the volume attached.
+    expected_outputs = {
+        "nginx-longhorn-example": "ext4   /var/www /dev/longhorn/pvc-",
+        "nginx-longhorn-nfs-example": "nfs4   /var/www ",
+    }
+    for pod_name, expected_output in expected_outputs.items():
+        k8s_util.wait_for_resource(
+            function_instance,
+            "pod",
+            pod_name,
+            condition=constants.K8S_CONDITION_READY,
+        )
 
-    process = function_instance.exec(
-        [
-            "k8s",
-            "kubectl",
-            "exec",
-            "nginx-longhorn-example",
-            "--",
-            "bash",
-            "-c",
-            "findmnt /var/www -o FSTYPE,TARGET,SOURCE",
-        ],
-        capture_output=True,
-        text=True,
-    )
+        process = function_instance.exec(
+            [
+                "k8s",
+                "kubectl",
+                "exec",
+                pod_name,
+                "--",
+                "bash",
+                "-c",
+                "findmnt /var/www -o FSTYPE,TARGET,SOURCE",
+            ],
+            capture_output=True,
+            text=True,
+        )
 
-    assert "ext4   /var/www /dev/longhorn/pvc-" in process.stdout
+        assert expected_output in process.stdout

tests/templates/nginx-nfs-pod.yaml

@@ -0,0 +1,28 @@
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: longhorn-nfs-pvc
+spec:
+  accessModes:
+    - ReadWriteMany
+  storageClassName: longhorn
+  resources:
+    requests:
+      storage: 1Gi
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  name: nginx-longhorn-nfs-example
+spec:
+  containers:
+    - name: nginx
+      image: nginx
+      volumeMounts:
+      - name: longhorn-pvc
+        mountPath: /var/www
+        readOnly: false
+  volumes:
+    - name: longhorn-pvc
+      persistentVolumeClaim:
+        claimName: longhorn-nfs-pvc