[systemd-devel] networkd: Support setting mtu / mac address by interface name

[Lennart Poettering]

On Thu, 04.12.14 18:53, Tom Gundersen (teg at jklm.no) wrote:

> >> Moreover, if we
> >> give people this feature I'm pretty sure we'll get lots of people
> >> expecting it to work also for any other sort of name and getting
> >> confused when it doesn't.
> >
> > Well, this is something we can fix by documentation, no?
> >
> > Or maybe name the match option differently, maybe OriginalName= or
> > KernelName= or so, and then only matching interfaces where you know
> > that the name was selected by userspace in the first place?
> 
> I like the idea of OriginalName, much less likely to get people
> confused. I now implemented that, with the restriction that we cannot
> match on renamed names. For now I left it open to match on ethX style
> names, as people in principle could do sensible things like
> "OriginalName=eth*" or even "OriginalName=eth0" when we know there is
> only one interface.
> 
> One thing to consider would be to disallow renaming from a .link file
> where the OriginalName was used to match. That way we don't have the
> somewhat odd situation that a .link file can only be applied once (we
> do not remember the original name, so cannot match on that the second
> time around, as that would be a mess)...

Maybe we should even store the original name in a udev property, so
that we can make this fully idempotent simply because we can always
check this new property for the original name passed down from the
kernel?

Lennart

-- 
Lennart Poettering, Red Hat