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

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Message-ID: <20210406092231.667138c2@hermes.local>
Date:   Tue, 6 Apr 2021 09:22:31 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Alyssa Ross <hi@...ssa.is>
Cc:     netdev@...r.kernel.org
Subject: Re: [iproute2] finding the name of a TAP created with %d

On Tue, 6 Apr 2021 13:42:40 +0000
Alyssa Ross <hi@...ssa.is> 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.

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