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From "Andy Isaacson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4139) fuse-dfs RO mode still allows file truncation
Date Mon, 12 Nov 2012 18:47:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13495497#comment-13495497
] 

Andy Isaacson commented on HDFS-4139:
-------------------------------------

bq. I tested this manually with some attempts to truncate a file, or otherwise modify the
file system. The kernel did the correct thing.

What errno did you get? Easiest to just paste a terminal session showing the commands and
error output.

bq. Also the FS now shows up under /proc/mounts as ro.

That's good, but again, please post the actual output.

Having the test commands and observed results in the bug history makes it easier for future
testers to reproduce your testing.
                
> 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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