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From "Andy Isaacson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4139) fuse-dfs RO mode still allows file truncation
Date Thu, 01 Nov 2012 22:18:12 GMT
Andy Isaacson created HDFS-4139:
-----------------------------------

             Summary: 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


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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