Re: Retrieving MAC address in grub2 network boot environment

[Andrey Borzenkov]

В Wed, 29 May 2013 14:31:43 -0700 (PDT)
Rigoberto Corujo <address@hidden> пишет:

> 
> 
> 
> 
> ----- Original Message -----
> > From: Rick Salevsky <address@hidden>
> > To: address@hidden
> > Cc: 
> > Sent: Wednesday, May 29, 2013 9:35 AM
> > Subject: Retrieving MAC address in grub2 network boot environment
> > 
> > Hay,
> > 
> > i need some help with grub2 network boot. My plan is to load different
> > configs for different machines. At first I created a main grub.cfg with
> > including "configfile uEFI/test.cfg" which works fine and the test.cfg
> > is loading.
> > 
> > But now i will do something like this: "configfile uEFI/$mac.cfg".
> > I once could access EFI variables, and could read out the MAC
> > and make above work.
> > But..., I cannot find anymore how I have done that :(
> > The EFI variable including the MAC address seem to differ
> > between different platforms.
> > 
> > The function:
> > net_ls_addr
> > provides:
> > efinet2 MAC IP
> > but I failed how to parse this in grub2 scripting.
> > I couldn't find out how to assign the result of a function to variables.
> > 
> > Has anyone an i idea how I can resolve this?
> > 
> > Bye,
> > -- 
> > Rick Salevsky
> > SUSE LINUX GmbH, Maxfeldstr. 5, D-90409 Nuernberg
> > Tel: +49-911-74053-538 - address@hidden
> > SUSE LINUX GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB
> > 21284 (AG Nürnberg)
> > 
> > 
> > _______________________________________________
> > Help-grub mailing list
> > address@hidden
> > https://lists.gnu.org/mailman/listinfo/help-grub
> > 
> 
> I had a similar question recently and the Grub 2 developers quickly 
> implemented the following variables:  net_default_interface, net_default_ip, 
> and net_default_mac
> If you build the latest sources, you should have access to them.
> 

To clarify - net_default_{interface|ip|mac} initially refer to interface
that was used to netboot GRUB2. On PC platform there is one
pseudo-interface "pxe"; and on EFI platform there are multiple
interfaces efinet0, efinet1, ... If GRUB2 was netbooted via e.g.
efinet1, then net_default_interface will be set to "efinet1" and both
other variables will be the same as net_efinet1_ip and net_efinet1_mac,
where net_efinet1_ip is presumably set by PXE.