cephfs: add upgrade testing

Upgrade testing will enable us to keep
in check the backward compatibility of
earlier releases.

Signed-off-by: Yug <yuggupta27@gmail.com>

e2e/upgrade-cephfs.go

@@ -0,0 +1,185 @@
+package e2e
+
+import (
+	"context"
+	"os"
+
+	. "github.com/onsi/ginkgo" // nolint
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/resource"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/version"
+	clientset "k8s.io/client-go/kubernetes"
+	"k8s.io/kubernetes/test/e2e/framework"
+	e2elog "k8s.io/kubernetes/test/e2e/framework/log"
+)
+
+var _ = Describe("CephFS Upgrade Testing", func() {
+	f := framework.NewDefaultFramework("upgrade-test-cephfs")
+	var (
+		c   clientset.Interface
+		pvc *v1.PersistentVolumeClaim
+		app *v1.Pod
+		// cwd stores the initial working directory.
+		cwd string
+	)
+	// deploy cephfs CSI
+	BeforeEach(func() {
+		if !upgradeTesting || !testCephFS {
+			Skip("Skipping CephFS Upgrade Test")
+		}
+		c = f.ClientSet
+		if cephCSINamespace != defaultNs {
+			err := createNamespace(c, cephCSINamespace)
+			if err != nil {
+				Fail(err.Error())
+			}
+		}
+
+		// fetch current working directory to switch back
+		// when we are done upgrading.
+		var err error
+		cwd, err = os.Getwd()
+		if err != nil {
+			Fail(err.Error())
+		}
+		err = upgradeAndDeployCSI(upgradeVersion, "cephfs")
+		if err != nil {
+			Fail(err.Error())
+		}
+		createConfigMap(cephfsDirPath, f.ClientSet, f)
+		createCephfsSecret(f.ClientSet, f)
+		createCephfsStorageClass(f.ClientSet, f, true, "")
+	})
+	AfterEach(func() {
+		if !testCephFS || !upgradeTesting {
+			Skip("Skipping CephFS Upgrade Test")
+		}
+		if CurrentGinkgoTestDescription().Failed {
+			// log pods created by helm chart
+			logsCSIPods("app=ceph-csi-cephfs", c)
+			// log provisoner
+			logsCSIPods("app=csi-cephfsplugin-provisioner", c)
+			// log node plugin
+			logsCSIPods("app=csi-cephfsplugin", c)
+		}
+		deleteConfigMap(cephfsDirPath)
+		deleteResource(cephfsExamplePath + "secret.yaml")
+		deleteResource(cephfsExamplePath + "storageclass.yaml")
+		if deployCephFS {
+			deleteCephfsPlugin()
+			if cephCSINamespace != defaultNs {
+				err := deleteNamespace(c, cephCSINamespace)
+				if err != nil {
+					Fail(err.Error())
+				}
+			}
+		}
+	})
+
+	Context("Cephfs Upgrade Test", func() {
+		It("Cephfs Upgrade Test", func() {
+
+			By("checking provisioner deployment is running")
+			err := waitForDeploymentComplete(cephfsDeploymentName, cephCSINamespace, f.ClientSet, deployTimeout)
+			if err != nil {
+				Fail(err.Error())
+			}
+
+			By("checking nodeplugin deamonsets is running")
+			err = waitForDaemonSets(cephfsDeamonSetName, cephCSINamespace, f.ClientSet, deployTimeout)
+			if err != nil {
+				Fail(err.Error())
+			}
+
+			By("upgrade to latest changes and verify app re-mount", func() {
+				// TODO: fetch pvc size from spec.
+				pvcSize := "2Gi"
+				pvcPath := cephfsExamplePath + "pvc.yaml"
+				appPath := cephfsExamplePath + "pod.yaml"
+
+				pvc, err = loadPVC(pvcPath)
+				if pvc == nil {
+					Fail(err.Error())
+				}
+				pvc.Namespace = f.UniqueName
+				e2elog.Logf("The PVC  template %+v", pvc)
+
+				app, err = loadApp(appPath)
+				if err != nil {
+					Fail(err.Error())
+				}
+				app.Namespace = f.UniqueName
+				app.Labels = map[string]string{"app": "upgrade-testing"}
+				pvc.Spec.Resources.Requests[v1.ResourceStorage] = resource.MustParse(pvcSize)
+				err = createPVCAndApp("", f, pvc, app, deployTimeout)
+				if err != nil {
+					Fail(err.Error())
+				}
+				err = deletePod(app.Name, app.Namespace, f.ClientSet, deployTimeout)
+				if err != nil {
+					Fail(err.Error())
+				}
+				deleteCephfsPlugin()
+
+				// switch back to current changes.
+				err = os.Chdir(cwd)
+				if err != nil {
+					Fail(err.Error())
+				}
+				deployCephfsPlugin()
+
+				app.Labels = map[string]string{"app": "upgrade-testing"}
+				// validate if the app gets bound to a pvc created by
+				// an earlier release.
+				err = createApp(f.ClientSet, app, deployTimeout)
+				if err != nil {
+					Fail(err.Error())
+				}
+			})
+
+			By("Resize pvc and verify expansion", func() {
+				var v *version.Info
+				pvcExpandSize := "5Gi"
+				v, err = f.ClientSet.Discovery().ServerVersion()
+				if err != nil {
+					e2elog.Logf("failed to get server version with error %v", err)
+					Fail(err.Error())
+				}
+				// Resize 0.3.0 is only supported from v1.15+
+				if v.Major > "1" || (v.Major == "1" && v.Minor >= "15") {
+					opt := metav1.ListOptions{
+						LabelSelector: "app=upgrade-testing",
+					}
+					pvc, err = f.ClientSet.CoreV1().PersistentVolumeClaims(pvc.Namespace).Get(context.TODO(), pvc.Name, metav1.GetOptions{})
+					if err != nil {
+						Fail(err.Error())
+					}
+
+					// resize PVC
+					err = expandPVCSize(f.ClientSet, pvc, pvcExpandSize, deployTimeout)
+					if err != nil {
+						Fail(err.Error())
+					}
+					// wait for application pod to come up after resize
+					err = waitForPodInRunningState(app.Name, app.Namespace, f.ClientSet, deployTimeout)
+					if err != nil {
+						Fail(err.Error())
+					}
+					// validate if resize is successful.
+					err = checkDirSize(app, f, &opt, pvcExpandSize)
+					if err != nil {
+						Fail(err.Error())
+					}
+				}
+
+			})
+
+			By("delete pvc and app")
+			err = deletePVCAndApp("", f, pvc, app)
+			if err != nil {
+				Fail(err.Error())
+			}
+		})
+	})
+})