update wwnToDevicePath for nvme (dell#42)

Author: delldubey

gofsutil_mount_unix.go

@@ -205,13 +205,18 @@ func (fs *FS) wwnToDevicePath(
 	symlinkPath := fmt.Sprintf("%s%s", MultipathDevDiskByIDPrefix, wwn)
 	devPath, err := os.Readlink(symlinkPath)
 
-	// Look for regular path device.
+	// Look for nvme path device.
 	if err != nil || devPath == "" {
-		symlinkPath = fmt.Sprintf("/dev/disk/by-id/wwn-0x%s", wwn)
+		symlinkPath = fmt.Sprintf("/dev/disk/by-id/nvme-eui.%s", wwn)
 		devPath, err = os.Readlink(symlinkPath)
-		if err != nil {
-			log.Printf("Check for disk path %s not found", symlinkPath)
-			return "", "", err
+		if err != nil || devPath == "" {
+			// Look for normal path device
+			symlinkPath = fmt.Sprintf("/dev/disk/by-id/wwn-0x%s", wwn)
+			devPath, err = os.Readlink(symlinkPath)
+			if err != nil {
+				log.Printf("Check for disk path %s not found", symlinkPath)
+				return "", "", err
+			}
 		}
 	}
 	components := strings.Split(devPath, "/")

gofsutil_unix_test.go

@@ -147,6 +147,12 @@ func TestWWNToDevicePath(t *testing.T) {
 			wwn:    "60570970000197900046533030394146",
 			result: "/dev/mydevb",
 		},
+		{
+			src:    "/dev/disk/by-id/nvme-eui.12635330303134340000976000012000",
+			tgt:    "../../mydevb",
+			wwn:    "12635330303134340000976000012000",
+			result: "/dev/mydevb",
+		},
 	}
 	for _, tt := range tests {
 		t.Run("", func(_ *testing.T) {