linux-kernel - Re: [PATCH net-next 10/11] tools: ynl: decode hex input

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Message-ID: <m21pohwdp1.fsf@gmail.com>
Date: Mon, 08 Sep 2025 09:28:26 +0100
From: Donald Hunter <donald.hunter@...il.com>
To: Asbjørn Sloth Tønnesen
 <ast@...erby.net>
Cc: Jacob Keller <jacob.e.keller@...el.com>,  "Jason A. Donenfeld"
 <Jason@...c4.com>,  "David S. Miller" <davem@...emloft.net>,  Eric Dumazet
 <edumazet@...gle.com>,  Jakub Kicinski <kuba@...nel.org>,  Paolo Abeni
 <pabeni@...hat.com>,  Simon Horman <horms@...nel.org>,  Andrew Lunn
 <andrew+netdev@...n.ch>,  wireguard@...ts.zx2c4.com,
  netdev@...r.kernel.org,  linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 10/11] tools: ynl: decode hex input

Asbjørn Sloth Tønnesen <ast@...erby.net> writes:

> On 9/6/25 12:27 AM, Jacob Keller wrote:
>> On 9/5/2025 3:51 AM, Donald Hunter wrote:
>>> Asbjørn Sloth Tønnesen <ast@...erby.net> writes:
>>>
>>>> This patch add support for decoding hex input, so
>>>> that binary attributes can be read through --json.
>>>>
>>>> Example (using future wireguard.yaml):
>>>>   $ sudo ./tools/net/ynl/pyynl/cli.py --family wireguard \
>>>>     --do set-device --json '{"ifindex":3,
>>>>       "private-key":"2a ae 6c 35 c9 4f cf <... to 32 bytes>"}'
>>>>
>>>> Signed-off-by: Asbjørn Sloth Tønnesen <ast@...erby.net>
>>>
>>> Reviewed-by: Donald Hunter <donald.hunter@...il.com>
>>>
>>> FWIW, the hex can include spaces or not when using bytes.fromhex(). When
>>> formatting hex for output, I chose to include spaces, but I don't really
>>> know if that was a good choice or not.
>> I also prefer the spaces for readability.
> I formatted it with spaces for clarity, even without spaces it was a bit
> long for one line. Spaces also has the advantage that you don't have to
> think about endianness.
>
> Should we define the display hints a bit more in a .rst, or is it OK that
> they end up being implementation specific for each language library? Do we
> want them to behave the same in a Rust YNL library, as they do in Python?

Yes we should probably extend the existing doc to at least describe some
of the defacto behaviour.

https://docs.kernel.org/userspace-api/netlink/specs.html#display-hint

> BTW: The rest of the key used in the example can be found with this key-gen:
> $ printf "hello world" | sha1sum
> [redacted key material]