[systemd-devel] Updating network file during boot

[Henti Smith]

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 ?

[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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