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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4139) fuse-dfs RO mode still allows file truncation
Date Mon, 12 Nov 2012 17:59:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13495456#comment-13495456
] 

Colin Patrick McCabe commented on HDFS-4139:
--------------------------------------------

I tested this manually with some attempts to truncate a file, or otherwise modify the file
system.  The kernel did the correct thing.  Also the FS now shows up under /proc/mounts as
ro.
                
> fuse-dfs RO mode still allows file truncation
> ---------------------------------------------
>
>                 Key: HDFS-4139
>                 URL: https://issues.apache.org/jira/browse/HDFS-4139
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: fuse-dfs
>    Affects Versions: 2.0.2-alpha
>            Reporter: Andy Isaacson
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-4139.001.patch
>
>
> Mounting a fuse-dfs in readonly mode with "-oro" still allows the user to truncate files.
> {noformat}
> $ grep fuse /etc/fstab
> hadoop-fuse-dfs#dfs://ubu-cdh-0.local /export/hdfs fuse noauto,ro 0 0
> $ sudo mount /export/hdfs
> $ hdfs dfs -ls /tmp
> ...
> -rw-r--r--   3 ubuntu hadoop          4 2012-11-01 14:18 /tmp/blah.txt
> $ echo foo > /export/hdfs/tmp/blah.txt
> -bash: /export/hdfs/tmp/blah.txt: Permission denied
> $  hdfs dfs -ls /tmp
> ...
> -rw-r--r--   3 ubuntu hadoop          0 2012-11-01 14:28 /tmp/blah.txt
> $ ps ax | grep dfs
> ...
> 13639 ?        Ssl    0:02 /usr/lib/hadoop/bin/fuse_dfs dfs://ubu-cdh-0.local /export/hdfs
-o ro,dev,suid
> {noformat}

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