Re: [iproute2] finding the name of a TAP created with %d

On Tue, 6 Apr 2021 13:42:40 +0000
Alyssa Ross [off-list ref] wrote:

If I do

	ip tuntap add name tap%d mode tap

then a TAP device with a name like "tap0", "tap1", etc. will be created.
But there's no way for me to find out which name was chosen for the
device created by that command.

Use a follow on ip link show or look in sysfs.

Perhaps ip should print the name of tuntap devices after they're
created?

You can already do that with followon command, or use batch to put two commands together.

I'd be interested in sending a patch, but I'd need some guidance on how
exactly it should work.  Would there be any harm in always printing it?
Should it be behind a flag?  Or just when the name contains a `%'?

Printing the result would make ip tuntap behave differently, which makes
it unique (snowflakes are bad) and would break users scripts.