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Re: Can GRUB2 request netboot config based on client MAC or IP?

From: Andrey Borzenkov
Subject: Re: Can GRUB2 request netboot config based on client MAC or IP?
Date: Sat, 22 Jun 2013 15:18:55 +0400

В Fri, 21 Jun 2013 20:17:59 -0400
Andrew Davidoff <address@hidden> пишет:

> Hi,
> I am playing with GRUB2 + UEFI + PXE. I'm coming from the pxelinux
> world, where clients try to pull down their netboot configuration by
> first looking for a file named in part by their MAC address, with
> colons replaced by dashes.
> I have built GRUB2 from bazaar and though I have played with it a good
> deal, it doesn't appear to me that I have the ability via grub-mkimage
> to introduce this behavior. The bootloader always looks for
> "grub.cfg", even when the root is set to (pxe).
> My first question is, is there a way to make GRUB2 try to first
> request a config file based on MAC address or HEX IP, similar to
> pxelinux and elilo (respectively)?

I do not think so, especially as it should be possible to implement in

> If the answer to my first question is "no", then I have a follow up:
> Does the GRUB2 scripting language support something similar to "sed"?

Yes, there is regexp command. As you are using current bzr sources,
this command is documented there.

> If so this would allow me to write a simple grub.cfg that translates
> colons in $net_default_mac to dashes, which would allow me to go pick
> up client-specific config without having to change the names of the
> files on disk. I don't see anything that looks "sedish" in
> grub-core/commands or in the online documentation. The goal here is to
> move to GRUB2 for UEFI PXE without having to change existing MAC based
> config filenames.
> Thanks.
> Andy
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