netdev - RE: [PATCH net] selftests: openvswitch: Use bash as interpreter

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Date: Wed, 19 Jun 2024 09:21:35 +0000
From: David Laight <David.Laight@...LAB.COM>
To: 'Simon Horman' <horms@...nel.org>, Przemek Kitszel
	<przemyslaw.kitszel@...el.com>
CC: Aaron Conole <aconole@...hat.com>, Adrian Moreno <amorenoz@...hat.com>,
	Pravin B Shelar <pshelar@....org>, Shuah Khan <shuah@...nel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>, "dev@...nvswitch.org"
	<dev@...nvswitch.org>, "linux-kselftest@...r.kernel.org"
	<linux-kselftest@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, "Paolo
 Abeni" <pabeni@...hat.com>
Subject: RE: [PATCH net] selftests: openvswitch: Use bash as interpreter

From: Simon Horman
> Sent: 17 June 2024 11:34
...
> > sidenote: I like very much the idea to use the least powerful tool, like
> > sh vs bash, awk vs gawk, but it breaks when we forget what is outside of
> > the scope of the former/standard.
> > Perhaps for shell, we could convert all the selftests at once?
> 
> Thanks,
> 
> Now that you mention it, I have the same feelings.
> 
> Do we ever expect to use the minimal tools, when other
> parts of the test suite depend on the enhanced ones?

Certainly trying to avoid bash-isms seems like a good idea.
Especially in scripts where it isn't really that hard.
OTOH avoiding posix features (so the script will run on a traditional SYSV /bin/sh)
is probably excessive.

I'd use "${foo%"${foo#?}"}" to get the first character without bash-isms.
But, IIRC, one version of ash/dash made a 'pig's breakfast' of the nested
pattern match.
(Most syntax highlighters don't get the quoting right either...)

	David

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