Unable to specify permissions bits for files and folders

[gabihodoroaga]

I'm trying to mount a bucket in a pod specify the permission bits like this:

apiVersion: v1
kind: Pod
metadata:
  name: gcs-fuse-csi-example-ephemeral 
  namespace: default
  annotations:
    gke-gcsfuse/volumes: "true" 
spec:
  terminationGracePeriodSeconds: 60
  containers:
  - image: busybox
    name: busybox
    command: ["sleep"]
    args: ["infinity"] 
    volumeMounts:
    - name: gcs-fuse-csi-ephemeral
      mountPath: /data
  serviceAccountName: gke-gcs-sa
  volumes:
  - name: gcs-fuse-csi-ephemeral
    csi:
      driver: gcsfuse.csi.storage.gke.io
      volumeAttributes:
        bucketName: just-a-random-bucket-name
        mountOptions: "implicit-dirs,file-system:dir-mode:777,file-system:file-mode:666" 

The permission bits are specified in octal according to the documentation, 777 and 666.

The bucket is not mounted and I see following error in the logs.

Error while mounting gcsfuse: mountWithStorageHandle: fs.NewServer: create file system: illegal file perms: --w--wx-w-

Debugging this I found out that the issue is that the driver is creating the config file as follows

file-system:
  dir-mode: 777
  file-mode: 666 

According to the documentation the permission bits should be in octal as string and not as numbers and the config file should look like this:

file-system:
  dir-mode: "777"
  file-mode: "666" 

The only workaround that I could find was to use the decimal number instead of the octal number.
For example 511 instead of 777 and 438 instead of 666.

...
        mountOptions: "implicit-dirs,file-system:dir-mode:511,file-system:file-mode:438" 
...

and works but this is not user friendly at it and does not respect the documentation.

I can create a PR to properly write the config file if this is accepted as the solution.