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Date:      Tue, 21 Nov 2023 19:57:31 -0600
From:      Mike Karels <mike@karels.net>
To:        Jamie Landeg-Jones <jamie@catflap.org>
Cc:        freebsd@igalic.co, zlei@FreeBSD.org, kevans@FreeBSD.org, freebsd-net@FreeBSD.org
Subject:   Re: How to tell if a network interface was renamed (and from what)
Message-ID:  <40C913A3-E5DC-4FC9-9ECE-937370EFD52D@karels.net>
In-Reply-To: <202311220135.3AM1Z8ED054659@donotpassgo.dyslexicfish.net>
References:  <pdHC0ObBkAbx2HfFIhWYaB5-dmQDEUzNTWvVVJAuJV7FWdWWeSwybVFD-uyBUxPlqDRpAW7D1aAZsbrTxEj9kqsq7ESgO41srPmS-PcXGqw=@igalic.co> <E5F5F61E-3827-404A-A46F-BBCF45A29A82@FreeBSD.org> <9eef5488-e8da-4edd-bc00-baeb5aaf4a23@FreeBSD.org> <ptnVEMJ_x48tdYePN4iYRiEW2vWqwulbEOUJ4dQ1cKGkxNXZPPfdEVHdJKNHFfs2onxNipVZKPwDZZKlDv1peS1Xttim1VitMFsdUiTkAKE=@igalic.co> <032BADD4-0A49-42E2-BAAB-40D2F76C64B9@FreeBSD.org> <rvRLOlpJc9xIf67ZwmZ4Si6TN2VtmIuyuguoQgEk5NTOeqsqkAwB_9KvlMbW6y-npSjCC2lmLVXbD4oIqyKJdDboThcWiehF_hU0L9D6GZc=@igalic.co> <31B38FCE-0B67-4122-A202-568150E971E1@karels.net> <202311220135.3AM1Z8ED054659@donotpassgo.dyslexicfish.net>

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On 21 Nov 2023, at 19:35, Jamie Landeg-Jones wrote:

> Mike Karels <mike@karels.net> wrote:
>
>> I have a proof of concept that makes the presumed original name
>> (driver name + unit number) available to ifconfig, which prints
>> the string with everything else in the standard output format.
>> I don't think that is the right solution, but the other details
>> should be easy.  I'm tempted to print the driver name and unit
>> number separately, although possibly as two words using the same
>> option.  It should probably be an option rather than a keyword,
>> so something like this:
>>
>> # ifconfig -N interface-name
>> igb 1
>> #
>>
>> Or the unit number could be on a separate option.
>>
>> Comments?
>
> I prefer that idea to the use of "groups" (which can be modified anyway),
> though in your example, that should be documented as "driver name" not
> "interface name", seeing that the returned value is not actually now
> the interface name!

Here, interface-name was a placeholder for the current name of the
interface.  My newer code prints "drivername: igb1" at the end of
the list of values for "ifconfig $interface-name" or "ifconfig -a"
if the -D option is given.  I decided that it was better to be able
to get all the translations at once (for humans, anyway).

		Mike

> (Similary, if a keyword is decided upon, it should be "driver-name"
> not "interface-name")
>
> I realise that writing "interface-name" was probably just muscle-memory,
> but just wanted clarification.
>
> No opinion on where to display the unit number - whatever works out
> better for you.
>
> Cheers, Jamie



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