Re: Redundant nfsroot cmdline options

[Seewer Philippe <philippe.seewer-omB+W0Dpw2o@public.gmane.org>]

Warren Togami wrote:
> On 06/17/2009 03:26 PM, Warren Togami wrote:
>>> # "/tftpboot/%s" will be used.
>>
>> This part about /tftpboot/ and the accompanying implementation in
>> 95nfs/nfsroot seems baffling.
>>
>> * In what cases does hostname lookup actually work here?
>> * Where does this precedent come from? This seems to be a really narrow
>> implementation from some specific past software with hard-coded
>> assumptions.
>> * For example /tftpboot isn't used by default configurations of tftp
>> servers on modern Debian, Ubuntu or Fedora anymore. They've moved to
>> FHS-compliant /var/lib/tftpboot. But then again nothing demands that the
>> sysadmin sticks with any particular path for the tftp server.
>> * What does tftpboot have to do with initrd? The initrd doesn't have
>> anything to do with tftp at this stage.
> 
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=Documentation/filesystems/nfsroot.txt 
> 
> 
> OK, I see in the Legacy documentation...
> 
> /tftpboot is only a default set if no path is provided.  You can 
> apparently have any path with an optional %s which is replaced by the 
> kernel.  In our case however we need to replace the %s ourselves.
> 
>> 62   <root-dir>    Name of the directory on the server to mount as root.
>> 63                 If there is a "%s" token in the string, it will be
>> 64                 replaced by the ASCII-representation of the client's
>> 65                 IP address.
> 
> The documentation only mentions "ASCII-representation of the client's IP 
> address", not hostname that 95nfs/nfsroot seems to indicate.
> 
> Where did the idea that %s is hostname come from?

The commit that introduced it is here:

http://dracut.git.sourceforge.net/git/gitweb.cgi?p=dracut;a=commitdiff;h=abe9ccc89a96bc61bc2e9d3169341821393da6da

Regards,
Philippe
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