Re: udev being an ass
On Wednesday 28 August 2019 12:53:15 Greg Wooledge wrote:
> On Wed, Aug 28, 2019 at 12:26:05PM -0400, Gene Heskett wrote:
> > So: delete /etc/udev/rules.d/70-persistent-net.rules AND edit /e/n/i
> > to put it back on eth0 where it belongs and it should work.
>
> Only on machines that have precisely ONE (1) network interface. On
> any machine with more than one, you will have a disaster.
>
> > But I want that file deleted at every bootup before any attempt to
> > use it is made.
>
> How about deleting it during shutdown, instead of during boot?
>
> > So I'm going to go out and see if that can be made to work by
> > deleting that file as the first line of if-up...
>
> It's much too late at that point ... unless your intent was actually
> to delete it for the NEXT boot, similar to my suggestion above, in
> which you delete it during system shutdown. In that case, it might
> kinda sorta not fail, by accident. It's certainly not *obvious* that
> you're deleting it for the next boot at that point, so the intent of
> your changes would be completely opaque to future-you. I do not
> advise it.
>
> A slightly less horrible alternative might be to delete all the
> non-comment lines from the file, add a comment that says "this file
> is intentionally empty because I made it so", then chattr +i the
> file. That should prevent udev from registering interfaces in it for
> future boots. It also has the advantage (over "delete during
> shutdown") that it'll still achieve your goal even if the system isn't
> shut down normally (e.g. power loss, or major kernel crash).
>
> Or, hell, for all I know, there may be some configuration knob in udev
> that says "never register my interface names in a file", and you can
> just find and turn that knob.
Instant reaction, Greg: Paranoia reigns supreme, so they would never,
ever, in a million years, give the user such a knob.
I've resorted to the chattr on more than one occasion. Works well if you
can get it all done before before the timer runs the N-M script again.
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>
Reply to: