operator: add missing udev env to discover pod

currently, we're setting the env `DISCOVER_DAEMON_UDEV_BLACKLIST`
in operator.yaml but we're not reading from the operator env and
setting the value to discover pod env.

Signed-off-by: subhamkrai <srai@redhat.com>
(cherry picked from commit 2742a707cc)

pkg/daemon/discover/discover.go

@@ -42,7 +42,7 @@ import (
 )
 
 const (
-	discoverDaemonUdev = "DISCOVER_DAEMON_UDEV_BLACKLIST"
+	DiscoverDaemonUdev = "DISCOVER_DAEMON_UDEV_BLACKLIST"
 )
 
 var (
@@ -200,7 +200,7 @@ func udevBlockMonitor(c chan struct{}, period time.Duration) {
 	// get discoverDaemonUdevBlacklist from the environment variable
 	// if user doesn't provide any regex; generate the default regex
 	// else use the regex provided by user
-	discoverUdev := os.Getenv(discoverDaemonUdev)
+	discoverUdev := os.Getenv(DiscoverDaemonUdev)
 	if discoverUdev == "" {
 		discoverUdev = "(?i)dm-[0-9]+,(?i)rbd[0-9]+,(?i)nbd[0-9]+"
 	}

pkg/operator/discover/discover.go

@@ -148,6 +148,7 @@ func (d *Discover) createDiscoverDaemonSet(ctx context.Context, namespace, disco
 								k8sutil.NamespaceEnvVar(),
 								k8sutil.NodeEnvVar(),
 								k8sutil.NameEnvVar(),
+								{Name: discoverDaemon.DiscoverDaemonUdev, Value: os.Getenv(discoverDaemon.DiscoverDaemonUdev)},
 							},
 						},
 					},

pkg/operator/discover/discover_test.go

@@ -80,7 +80,7 @@ func TestStartDiscoveryDaemonset(t *testing.T) {
 	volumeMounts := agentDS.Spec.Template.Spec.Containers[0].VolumeMounts
 	assert.Equal(t, 3, len(volumeMounts))
 	envs := agentDS.Spec.Template.Spec.Containers[0].Env
-	assert.Equal(t, 3, len(envs))
+	assert.Equal(t, 4, len(envs))
 	image := agentDS.Spec.Template.Spec.Containers[0].Image
 	assert.Equal(t, "rook/rook:myversion", image)
 	assert.Nil(t, agentDS.Spec.Template.Spec.Tolerations)