[PATCH 2/2] Search for specific config file when it boots from tftp

[Paulo Flabiano Smorigo/Brazil/IBM]

Hi all,

This patch implements a search for a specific configuration (based on  
MAC or IP) when the config file is on the tftp server. He uses the  
following order:

   1) By MAC address (in lower case hexadecimal with dash separators);
   2) By IP (in upper case hexadecimal). It removes one hex digit  
from the end and try again;
   3) The original grub.cfg file.

For example, MAC address e4:1f:13:f4:ad:c2 and IP 192.168.1.100 (C0A80164):

(tftp,192.168.1.1)//boot/grub/grub.cfg-01-e4-1f-13-f4-ad-c2
(tftp,192.168.1.1)//boot/grub/grub.cfg-C0A80164
(tftp,192.168.1.1)//boot/grub/grub.cfg-C0A8016
(tftp,192.168.1.1)//boot/grub/grub.cfg-C0A801
(tftp,192.168.1.1)//boot/grub/grub.cfg-C0A80
(tftp,192.168.1.1)//boot/grub/grub.cfg-C0A8
(tftp,192.168.1.1)//boot/grub/grub.cfg-C0A
(tftp,192.168.1.1)//boot/grub/grub.cfg-C0
(tftp,192.168.1.1)//boot/grub/grub.cfg-C
(tftp,192.168.1.1)//boot/grub/grub.cfg

This procedure is similar to what is used by pxelinux and yaboot:

http://www.syslinux.org/wiki/index.php/PXELINUX#config

--
Paulo Flabiano Smorigo
Software Engineer
Linux Technology Center - IBM Systems & Technology Group
freenode/bluenet: pfsmorigo or smow

search_configfile.patch
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