[jira] Resolved: (HADOOP-5024) DFS chmod does not correctly parse some multiple-mode permission specifications

["Jakob Homan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-5024?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jakob Homan resolved HADOOP-5024.
---------------------------------

    Resolution: Invalid

> DFS chmod does not correctly parse some multiple-mode permission specifications
> -------------------------------------------------------------------------------
>
>                 Key: HADOOP-5024
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5024
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Jakob Homan
>
> The current implementation of chmod attempts to combine multiple permission specifications into one omnibus specification that represents the end result of all the specifications.  However, this fails for some specifications, essentially allowing the latest specified mode to override the prior ones.  For example the following chmod in unix results in:
> {noformat}
>      [auser@machine test]$ mkdir foo   
>      [auser@machine test]$ chmod 000 foo
>      [auser@machine test]$ ls -l foo 
>      d---------  2 auser users 4.0K Jan 10 02:09 foo
>      [auser@machine test]$ chmod u+rw,+x foo
>      [auser@machine test]$ ls -l foo
>      drwx--x--x  2 auser users 4.0K Jan 10 02:09 foo
> {noformat}
> while the current implementation results in: (adapted from TestDFSShell.java)
> {noformat}
>      runCmd(shell, "-chmod", "000", file.toString());
>      assertEquals("---------", fs.getFileStatus(file).getPermission().toString());
>      
>      runCmd(shell, "-chmod", "u+rw,+x", file.toString());
>      assertEquals("drwx--x--x", fs.getFileStatus(file).getPermission().toString());
>      // fails, with the actual result of
>      // result = --x--x--x
> {noformat}
> Unix appears to apply each specified mode sequentially, and this approach would correct the problem in DFSShell as well at the cost of a separate rpc call for each mode specification.  

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