netdev - Re: [PATCH net-next 3/6] selftests: net: py: extract tool logic

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Date: Sat, 27 Apr 2024 09:51:01 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Jakub Kicinski <kuba@...nel.org>, 
 davem@...emloft.net
Cc: netdev@...r.kernel.org, 
 edumazet@...gle.com, 
 pabeni@...hat.com, 
 linux-kselftest@...r.kernel.org, 
 willemdebruijn.kernel@...il.com, 
 Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next 3/6] selftests: net: py: extract tool logic

Jakub Kicinski wrote:
> The main use of the ip() wrapper over cmd() is that it can parse JSON.
> cmd("ip -j link show") will return stdout as a string, and test has
> to call json.loads(). With ip("link show", json=True) the return value
> will be already parsed.
> 
> More tools (ethtool, bpftool etc.) support the --json switch.
> To avoid having to wrap all of them individually create a tool()
> helper.
> 
> Switch from -j to --json (for ethtool).
> While at it consume the netns attribute at the ip() level.
> 
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
>  tools/testing/selftests/net/lib/py/utils.py | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/testing/selftests/net/lib/py/utils.py b/tools/testing/selftests/net/lib/py/utils.py
> index d3715e6c21f2..11b588a2bb9d 100644
> --- a/tools/testing/selftests/net/lib/py/utils.py
> +++ b/tools/testing/selftests/net/lib/py/utils.py
> @@ -56,10 +56,10 @@ import time
>          return self.process(terminate=self.terminate)
>  
>  
> -def ip(args, json=None, ns=None, host=None):
> -    cmd_str = "ip "
> +def tool(name, args, json=None, ns=None, host=None):
> +    cmd_str = name + " "
>      if json:
> -        cmd_str += '-j '
> +        cmd_str += '--json '
>      cmd_str += args
>      cmd_obj = cmd(cmd_str, ns=ns, host=host)
>      if json:
> @@ -67,6 +67,12 @@ import time
>      return cmd_obj
>  
>  
> +def ip(args, json=None, ns=None, host=None):
> +    if ns:
> +        args = '-netns ' + ns + " " + args

Minor: inconsistent use of single and double comma strings. Maybe
there's a reasoning that I'm just missing.

> +    return tool("ip", args, json=json, host=host)
> +
> +
>  def rand_port():
>      """
>      Get unprivileged port, for now just random, one day we may decide to check if used.
> -- 
> 2.44.0
>