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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: Sun, 23 Jun 2013 09:39:52 +0400

В Sat, 22 Jun 2013 16:22:31 -0400
Andrew Davidoff <address@hidden> пишет:

> On Sat, Jun 22, 2013 at 7:18 AM, Andrey Borzenkov <address@hidden> wrote:
> > Yes, there is regexp command. As you are using current bzr sources,
> > this command is documented there.
> Thanks Andrey. I got this all working. One thing - it seems that I am
> unable to export $net_default_mac so that subsidiary configfile's can
> see it.

I briefly tested it using QEMU and I cannot reproduce it. After
"configfile /some/other/file" I still see the same variables, in
particular net_default_ip and net_default_mac. So you need to show your
configuration files.

>            If I do:
> export net_default_mac

Internally this variable is aliased to return MAC address of the
correct interface (it is alias for net_pxe_mac). When you set it from
configuration file you probably destroy this magic and it becomes plain
variable which does not have any value assigned so far.

> in grub.cfg then load another config, net_default_mac is set to
> (null). If however I set my own variable to the value of
> $net_default_mac in grub.cfg, then export that variable in the same
> way I was trying to export net_default_mac, the subsidiary configfile
> is able to read the expected MAC address from my variable. I am not
> sure if this is expected behavior or not. I realize that with
> net_default_mac being a built in, it could be special. Using my own
> variable to work around this is fine, though.
> Thanks again for your help on this!
> Andy

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