[systemd-devel] Updating network file during boot

[Andrei Borzenkov]

On 22.08.2024 16:56, Henti Smith wrote:
> On Thu, 22 Aug 2024 at 12:45, Andrei Borzenkov <arvidjaar at gmail.com> wrote:
> 
>> On Wed, Aug 21, 2024 at 7:12 PM Lennart Poettering
>> <lennart at poettering.net> wrote:
>>
>>> Honestly, I'd really avoid mixing rename via udev rules and rename via
>>> .link files. I'd stick to .link files for this, really.
>>>
>>
>> All .link files do is to suggest the "best" name which is ignored if
>> NAME has already been set. They do not really rename anything
>> themselves. Besides, OP cannot use .link files because there is no
>> persistent device property that can be matched by them.
>>
> 
> I've switched to using "Property=" as follows:
>      # Fixed MAC and name for enp6s0 (Block Diagram) when debug board is not
> plugged in
>      # Renamed to mvc-sw2 by PCI Address.
>      [Match]
> 
> Property=DEVPATH=/devices/pci0000:00/0000:00:11.0/0000:05:00.0/net/enp5s0
> 
>      [Link]
>      MACAddress=02:00:00:00:06:00
>      Name=mvc-sw2
> 
> However this is also inconsistent:

What systemd version?

>      reboot   system boot  5.4.0-192-generi Tue Nov 21 23:16         :
> success
>      2023-11-21T23:16:44.233996+00:00 av20-mvc-01 systemd-networkd[1136]:
> eth1: Interface name change detected, eth1 has been renamed to enp5s0.
>      2023-11-21T23:16:44.234049+00:00 av20-mvc-01 systemd-networkd[1136]:
> enp5s0: Interface name change detected, enp5s0 has been renamed to mvc-sw2.
>      2023-11-21T23:16:44.235208+00:00 av20-mvc-01 kernel: [    7.430556] oak
> 0000:05:00.0 enp5s0: renamed from eth1
>      2023-11-21T23:16:44.235216+00:00 av20-mvc-01 kernel: [    7.693221] oak
> 0000:05:00.0 mvc-sw2: renamed from enp5s0
> 
>      reboot   system boot  5.4.0-192-generi Tue Nov 21 23:18         : failed
>      2023-11-21T23:16:44.233996+00:00 av20-mvc-01 systemd-networkd[1136]:
> eth1: Interface name change detected, eth1 has been renamed to enp5s0.
>      2023-11-21T23:16:44.234049+00:00 av20-mvc-01 systemd-networkd[1136]:
> enp5s0: Interface name change detected, enp5s0 has been renamed to mvc-sw2.
>      2023-11-21T23:16:44.235208+00:00 av20-mvc-01 kernel: [    7.430556] oak
> 0000:05:00.0 enp5s0: renamed from eth1
>      2023-11-21T23:16:44.235216+00:00 av20-mvc-01 kernel: [    7.693221] oak
> 0000:05:00.0 mvc-sw2: renamed from enp5s0
>      2023-11-21T23:18:45.186181+00:00 av20-mvc-01 systemd-networkd[986]:
> enp5s0: Interface name change detected, enp5s0 has been renamed to eth1.
>      2023-11-21T23:18:45.186186+00:00 av20-mvc-01 systemd-networkd[986]:
> eth1: Interface name change detected, eth1 has been renamed to enp5s0.
>      2023-11-21T23:18:45.187417+00:00 av20-mvc-01 kernel: [    6.926580] oak
> 0000:05:00.0 enp5s0: renamed from eth1
> 
> Henti
> 
> 
>> It is possible that there are conflicting rules in initrd. It is also
>> possible that udev races with the networkd.
>>
>