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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4139) fuse-dfs RO mode still allows file truncation
Date Wed, 14 Nov 2012 10:50:18 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497019#comment-13497019
] 

Hudson commented on HDFS-4139:
------------------------------

Integrated in Hadoop-Yarn-trunk #36 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/36/])
    HDFS-4139. fuse-dfs RO mode still allows file truncation. Contributed by Colin Patrick
McCabe (Revision 1409088)

     Result = SUCCESS
eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1409088
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_context_handle.h
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_dfs.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_mkdir.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_rename.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_rmdir.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_unlink.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_init.c

                
> 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
>             Fix For: 2.0.3-alpha
>
>         Attachments: HDFS-4139.001.patch, HDFS-4139.002.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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