Re: Redundant nfsroot cmdline options

[Warren Togami <wtogami-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

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?

Warren Togami
wtogami-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
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