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Re: Network Boot Get Hostname In grub.cfg

From: Federico Vaga
Subject: Re: Network Boot Get Hostname In grub.cfg
Date: Wed, 1 Dec 2021 11:31:27 +0100

Hi Andrei,

I'm sorry for the late reply but I never received your email which I
just found on the help-grub archive.

On 11.11.2021 22:00, Andrei Borzenkov wrote:
On 11.11.2021 12:36, Federico Vaga wrote:
> Hello,
> > I'm trying to get the hostname in `grub.cfg` to point then to
> different rootnfs, or network live images.
> > From the manual page: > > > > I've noticed the existence of `net_<interface>_hostname` but this
> requires to know the `<interface>` name in advance and this is
> platform dependent (as the documentation says).
> > Since these systems have only one network connection I thought about
> using `net_default_interface` to ignore the specific name. Here
> problems strarts because neasting variables seems not working and
> doing: `${net_${net_default_interface}_hostname}`
eval "set myhostname=\${net_${net_default_interface}_hostname}"

and use $myhostname in following code

How this is different from just using `set` or the variable directly?
Why `eval` should help? (It doesn't)

Plus, why are you escaping the first dollar, but not the second?

> However, in the documentation variables like `net_default_ip` are
> described as the result of ‘net_${net_default_interface}_ip’.
> > Am I doing something wrong? Do you have any suggestion? > > Thanks >

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