[systemd-bugs] [Bug 56929] udev makes network interfaces available before it has renamed them

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=56929

--- Comment #3 from Kay Sievers <kay at vrfy.org> ---
Short version:
The rule will not work any more, and cannot be made working with systemd.
The rules need to use names now which do not use kernel names like ethX.

Biosdevname *should* work fine, even without "BIOS support" in that
sense. It should be able to calculate a predictable name based
on the physical location of the hardware, at least if PCI/USB hardware
is used.

Long version:
We do no longer support renaming network interfaces in the kernel
namespace. Interface names are required to use custom names that
can never clash with the kernel created ones.

We do not support swapping names; we cannot win any race against
the kernel creating new interfaces at the same time.

We do no longer support the creation of udev rules from inside the
hotplug path.

It was pretty naive to ever try this in the first place, it all is a
problem that cannot be solved properly, and which creates many more
new problems than it solves. The entire udev-based automatic persistent
network names is all just a long history of failures, it pretended to
be able to solve something; but it couldn't deliver. We completely
stopped pretending that now, and need to move on to something that
can work out in a reliable and predictable manner.

Predictable network interface names require a tool like biosdevname,
or manually configured names, which do not use the kernel names.

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