cleanup: remove duplicate code

Signed-off-by: Madhu Rajanna <mrajanna@redhat.com>

cmd/cephfs/main.go

@@ -19,11 +19,9 @@ package main
 import (
 	"flag"
 	"os"
-	"path"
 
 	"github.com/ceph/ceph-csi/pkg/cephfs"
 	"github.com/ceph/ceph-csi/pkg/util"
-	"k8s.io/klog"
 )
 
 var (
@@ -37,19 +35,8 @@ var (
 func main() {
 	util.InitLogging()
 
-	if err := createPersistentStorage(path.Join(cephfs.PluginFolder, "controller")); err != nil {
+	cp, err := util.CreatePersistanceStorage(cephfs.PluginFolder, *metadataStorage, *driverName)
-		klog.Errorf("failed to create persistent storage for controller: %v", err)
-		os.Exit(1)
-	}
-
-	if err := createPersistentStorage(path.Join(cephfs.PluginFolder, "node")); err != nil {
-		klog.Errorf("failed to create persistent storage for node: %v", err)
-		os.Exit(1)
-	}
-
-	cp, err := util.NewCachePersister(*metadataStorage, *driverName)
 	if err != nil {
-		klog.Errorf("failed to define cache persistence method: %v", err)
 		os.Exit(1)
 	}
 
@@ -58,7 +45,3 @@ func main() {
 
 	os.Exit(0)
 }
-
-func createPersistentStorage(persistentStoragePath string) error {
-	return os.MkdirAll(persistentStoragePath, os.FileMode(0755))
-}

cmd/rbd/main.go

@@ -19,11 +19,9 @@ package main
 import (
 	"flag"
 	"os"
-	"path"
 
 	"github.com/ceph/ceph-csi/pkg/rbd"
 	"github.com/ceph/ceph-csi/pkg/util"
-	"k8s.io/klog"
 )
 
 var (
@@ -37,18 +35,8 @@ var (
 func main() {
 	util.InitLogging()
 
-	if err := createPersistentStorage(path.Join(rbd.PluginFolder, "controller")); err != nil {
+	cp, err := util.CreatePersistanceStorage(rbd.PluginFolder, *metadataStorage, *driverName)
-		klog.Errorf("failed to create persistent storage for controller %v", err)
-		os.Exit(1)
-	}
-	if err := createPersistentStorage(path.Join(rbd.PluginFolder, "node")); err != nil {
-		klog.Errorf("failed to create persistent storage for node %v", err)
-		os.Exit(1)
-	}
-
-	cp, err := util.NewCachePersister(*metadataStorage, *driverName)
 	if err != nil {
-		klog.Errorf("failed to define cache persistence method: %v", err)
 		os.Exit(1)
 	}
 
@@ -57,14 +45,3 @@ func main() {
 
 	os.Exit(0)
 }
-
-func createPersistentStorage(persistentStoragePath string) error {
-	if _, err := os.Stat(persistentStoragePath); os.IsNotExist(err) {
-		if err = os.MkdirAll(persistentStoragePath, os.FileMode(0755)); err != nil {
-			return err
-		}
-	} else {
-		return err
-	}
-	return nil
-}

pkg/util/util.go

@@ -0,0 +1,49 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package util
+
+import (
+	"os"
+	"path"
+
+	"k8s.io/klog"
+)
+
+// CreatePersistanceStorage creates storage path and initializes new cache
+func CreatePersistanceStorage(sPath, metaDataStore, driverName string) (CachePersister, error) {
+	var err error
+	if err = createPersistentStorage(path.Join(sPath, "controller")); err != nil {
+		klog.Errorf("failed to create persistent storage for controller: %v", err)
+		return nil, err
+	}
+
+	if err = createPersistentStorage(path.Join(sPath, "node")); err != nil {
+		klog.Errorf("failed to create persistent storage for node: %v", err)
+		return nil, err
+	}
+
+	cp, err := NewCachePersister(metaDataStore, driverName)
+	if err != nil {
+		klog.Errorf("failed to define cache persistence method: %v", err)
+		return nil, err
+	}
+	return cp, err
+}
+
+func createPersistentStorage(persistentStoragePath string) error {
+	return os.MkdirAll(persistentStoragePath, os.FileMode(0755))
+}