[systemd-devel] Updating network file during boot

[Henti Smith]

Hello Etienne

I cannot find any info on how to extract this information from the current
system.

How would I go about doing that ?

Kind regards
Henti

On Tue, 13 Aug 2024 at 17:56, Etienne Champetier <
champetier.etienne at gmail.com> wrote:

> Hello Henti,
>
> Le mar. 13 août 2024 à 12:16, Henti Smith <henti at gaydonsmith.co.uk> a
> écrit :
> >
> > Good day everybody.
> >
> > I've searched high and low and cannot seem to find an answer for what
> I'm trying to do. The most relevant I found was this [1] thread in 2020,
> but only because I'm using a script to change the contents of my .link
> files during boot, which is not working constantly.
> >
> > Some things to note:
> > 1. The hardware is sample hardware so Mac addresses are 00:00:00:00:00.
> > 2. The hardware has an external hot-swap PCId port that takes a board
> for VGA out.
> > 3. We're attempting to configure two interfaces.
> >
> > The problem is when the board is attached the PCI numbering of the two
> interfaces change. With the board attached, it's 5 and 6, without it 4 and
> 5.
> >
> > Normally this would not be a problem, since you can Match on mac
> address, but in this case, both have the same mac address of 00:00:00:00:00.
> >
> > My attempt to fix this was to create a script [2] that enumerated the
> PCI ports for the hardware manufacturer and use that information to update
> the link files [2] before systemd-networkd starts, but this does not work
> constantly.
> >
> > Are there any other recommendations to resolve this situation or if my
> approach is the only real way to do this, how can I ensure my script is
> executed before systemd uses the link files to apply the interface
> configuration ?
>
> Does the platform provide ACPI _SUN info by any chance ?
> https://github.com/systemd/systemd/pull/33682
>
> Best
> Etienne
>
> >
> > [1]
> https://lists.freedesktop.org/archives/systemd-devel/2020-June/044784.html
> > [2] https://paste.mozilla.org/jgcCyo9A
> > [3] https://paste.mozilla.org/zXQYpXpd
> >
> > Any guidance would be most welcome.
> >
> > Kind regards
> > Henti Smith
>
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