Initial publication of ZFSSA CSI driver

pkg/service/mount.go

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2021, Oracle and/or its affiliates.
+ * Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl/
+ */
+
+package service
+
+import (
+	"k8s.io/utils/mount"
+	"os"
+)
+
+// Mounter is an interface for mount operations
+type Mounter interface {
+	mount.Interface
+	GetDeviceName(mountPath string) (string, int, error)
+	MakeFile(pathname string) error
+	ExistsPath(pathname string) (bool, error)
+}
+
+type NodeMounter struct {
+	mount.SafeFormatAndMount
+}
+
+func newNodeMounter() Mounter {
+	return &NodeMounter{
+		mount.SafeFormatAndMount{
+			Interface: mount.New(""),
+		},
+	}
+}
+
+// Retrieve a device name from a mount point (this is a compatibility interface)
+func (m *NodeMounter) GetDeviceName(mountPath string) (string, int, error) {
+	return mount.GetDeviceNameFromMount(m, mountPath)
+}
+
+// Make a file at the pathname
+func (mounter *NodeMounter) MakeFile(pathname string) error {
+	f, err := os.OpenFile(pathname, os.O_CREATE, os.FileMode(0644))
+	defer f.Close()
+
+	if err != nil && !os.IsExist(err) {
+		return err
+	}
+
+	return nil
+}
+
+// Check if a file exists
+func (mount *NodeMounter) ExistsPath(pathname string) (bool, error) {
+	// Check if the global mount path exists and create it if it does not
+	exists := true
+	_, err := os.Stat(pathname)
+
+	if _, err := os.Stat(pathname); os.IsNotExist(err) {
+		exists = false
+	}
+
+	return exists, err
+}