e2e/storage: reset driver config in the test suite

PR #70862 made each driver responsible for resetting its config, but
as it turned out, one place was missed in that PR: the in-tree gcepd
sets a node selector. Not resetting that caused other tests to fail
randomly depending on test execution order.

Now the test suite resets the config by taking a copy after setting up
the driver and restoring that copy before each test.

Long term the intention is to separate the entire test config from the
static driver info (https://github.com/kubernetes/kubernetes/issues/72288),
but for now resetting the config is the fastest way to fix the test flake.

Fixes: #72378

test/e2e/storage/csi_volumes.go

@@ -127,20 +127,23 @@ var _ = utils.SIGDescribe("CSI Volumes", func() {
 
 	for _, initDriver := range csiTestDrivers {
 		curDriver := initDriver(config)
+		curConfig := curDriver.GetDriverInfo().Config
 		Context(testsuites.GetDriverNameWithFeatureTags(curDriver), func() {
-			driver := curDriver
-
 			BeforeEach(func() {
+				// Reset config. The driver might have modified its copy
+				// in a previous test.
+				curDriver.GetDriverInfo().Config = curConfig
+
 				// setupDriver
-				driver.CreateDriver()
+				curDriver.CreateDriver()
 			})
 
 			AfterEach(func() {
 				// Cleanup driver
-				driver.CleanupDriver()
+				curDriver.CleanupDriver()
 			})
 
-			testsuites.RunTestSuite(f, driver, csiTestSuites, csiTunePattern)
+			testsuites.RunTestSuite(f, curDriver, csiTestSuites, csiTunePattern)
 		})
 	}
 

test/e2e/storage/drivers/in_tree.go

@@ -151,9 +151,6 @@ func (n *nfsDriver) CreateDriver() {
 	ns := f.Namespace
 	n.externalPluginName = fmt.Sprintf("example.com/nfs-%s", ns.Name)
 
-	// Reset config. It might have been modified by a previous CreateVolume call.
-	n.driverInfo.Config.ServerConfig = nil
-
 	// TODO(mkimuram): cluster-admin gives too much right but system:persistent-volume-provisioner
 	// is not enough. We should create new clusterrole for testing.
 	framework.BindClusterRole(cs.RbacV1beta1(), "cluster-admin", ns.Name,
@@ -298,8 +295,6 @@ func (g *glusterFSDriver) GetPersistentVolumeSource(readOnly bool, fsType string
 }
 
 func (g *glusterFSDriver) CreateDriver() {
-	// Reset config. It might have been modified by a previous CreateVolume call.
-	g.driverInfo.Config.ServerConfig = nil
 }
 
 func (g *glusterFSDriver) CleanupDriver() {
@@ -429,8 +424,6 @@ func (i *iSCSIDriver) GetPersistentVolumeSource(readOnly bool, fsType string, te
 }
 
 func (i *iSCSIDriver) CreateDriver() {
-	// Reset config. It might have been modified by a previous CreateVolume call.
-	i.driverInfo.Config.ServerConfig = nil
 }
 
 func (i *iSCSIDriver) CleanupDriver() {
@@ -556,8 +549,6 @@ func (r *rbdDriver) GetPersistentVolumeSource(readOnly bool, fsType string, test
 }
 
 func (r *rbdDriver) CreateDriver() {
-	// Reset config. It might have been modified by a previous CreateVolume call.
-	r.driverInfo.Config.ServerConfig = nil
 }
 
 func (r *rbdDriver) CleanupDriver() {
@@ -670,8 +661,6 @@ func (c *cephFSDriver) GetPersistentVolumeSource(readOnly bool, fsType string, t
 }
 
 func (c *cephFSDriver) CreateDriver() {
-	// Reset config. It might have been modified by a previous CreateVolume call.
-	c.driverInfo.Config.ServerConfig = nil
 }
 
 func (c *cephFSDriver) CleanupDriver() {

test/e2e/storage/in_tree_volumes.go

@@ -69,20 +69,23 @@ var _ = utils.SIGDescribe("In-tree Volumes", func() {
 
 	for _, initDriver := range testDrivers {
 		curDriver := initDriver(config)
+		curConfig := curDriver.GetDriverInfo().Config
 		Context(testsuites.GetDriverNameWithFeatureTags(curDriver), func() {
-			driver := curDriver
-
 			BeforeEach(func() {
+				// Reset config. The driver might have modified its copy
+				// in a previous test.
+				curDriver.GetDriverInfo().Config = curConfig
+
 				// setupDriver
-				driver.CreateDriver()
+				curDriver.CreateDriver()
 			})
 
 			AfterEach(func() {
 				// Cleanup driver
-				driver.CleanupDriver()
+				curDriver.CleanupDriver()
 			})
 
-			testsuites.RunTestSuite(f, driver, testSuites, intreeTunePattern)
+			testsuites.RunTestSuite(f, curDriver, testSuites, intreeTunePattern)
 		})
 	}
 })