[rrd-developers] rrd_graph and flush behavior

[kevin brintnall]

It looks like you're exactly right..  I'll submit a patch shortly.

Thanks!

-kb

On Tue, May 25, 2010 at 4:53 PM, Eduardo Bragatto <eduardo at bragatto.com>wrote:

> On May 25, 2010, at 6:14 PM, Eduardo Bragatto wrote:
>
>  On May 25, 2010, at 5:28 PM, kevin brintnall wrote:
>>
>>  The symbolic link should work.  Can you verify whether realpath(2)
>>> on your system reports the correct path in the symlink case?  If
>>> realpath(2) is right and the client is still not providing the right
>>> file name, then there is definitely a problem.
>>>
>>
>> realpath(3) does work.
>>
>> I have used this little wrapper:
>>
>> http://yost.com/computers/compileAndGo/realpath.html
>>
>> And after compiling and running it, I do get the real path:
>>
>> # ./test_realpath /usr/local/rrd/stable-crm2/repository/manager.nbg/
>> switches/whk2s1/10146.rrd
>> /usr/local/rrd/stable-crm2/rrd/switches/whk2s1/10146.rrd
>>
>> However calling "rrd_graph" to read "/usr/local/rrd/stable-crm2/
>> repository/manager.nbg/switches/whk2s1/10146.rrd" does not cause it to
>> flush to disk.
>>
>
> Hi,
>
> I have checked the code from rrd_client.c and indeed there was a problem
> there, starting on line #75 (rrdtool 1.4.3 stable):
>
>  if (*path == '/') /* absolute path */
>  {
>    if (! is_unix)
>    {
>      rrd_set_error ("absolute path names not allowed when talking "
>          "to a remote daemon");
>      return (NULL);
>    }
>  }
>  else /* relative path */
>  {
>    if (is_unix)
>    {
>      realpath (path, resolved_path);
>      ret = resolved_path;
>    }
>    /* else: nothing to do */
>  }
>  return (ret);
>
> As we can see there, realpath is only called if using relative paths.
>
> realpath should also be called if it's an absolute path AND we are talking
> to a unix socket. Patching the code as follows has resolved the issue with
> symlinks:
>
>  if (*path == '/') /* absolute path */
>  {
>    if (! is_unix)
>    {
>      rrd_set_error ("absolute path names not allowed when talking "
>          "to a remote daemon");
>      return (NULL);
>    }
>    /**** started adding here ***/
>    else
>    {
>      realpath (path, resolved_path);
>      ret = resolved_path;
>    }
>    /**** stopped adding here ***/
>  }
>  else /* relative path */
>  {
>    if (is_unix)
>    {
>      realpath (path, resolved_path);
>      ret = resolved_path;
>    }
>    /* else: nothing to do */
>  }
>
> Thank you all for your assistance. I hope to see this fix in a future
> stable release.
>
> - Eduardo Bragatto.
>



-- 
kevin brintnall =~ /kbrint at rufus.net/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.oetiker.ch/pipermail/rrd-developers/attachments/20100525/38a369cd/attachment.html