rgw: how to prevent rgw user from creating a new bucket?

[Yang Joseph <joseph.yang@xxxxxxxxxxxx>]

Hello,

I would like only to allow the user to read the object in a already 
existed bucket, and not allow users
to create new bucket. It supposed to execute the following command:

$ radosgw-admin metadata put user:test3 < ...
  ...
        "caps": [
            {
                "type": "buckets",
                "perm": "read"
            }

But why user test3 can still create new bucket after I have set its caps 
to "buckets=read"?

thx,

Yang Honggang

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