linux-kernel - Re: [patch 1/3, resend] scripts: replace gawk, head, bc with shell, update

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Date:	Wed, 7 Feb 2007 14:02:27 +0100
From:	Oleg Verych <olecom@...wer.upol.cz>
To:	Jesper Juhl <jesper.juhl@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Sam Ravnborg <sam@...nborg.org>,
	William Stearns <wstearns@...ox.com>,
	Martin Schlemmer <azarah@...feratu.za.org>
Subject: Re: [patch 1/3, resend] scripts: replace gawk, head, bc with shell, update

On Wed, Feb 07, 2007 at 09:58:12AM +0100, Jesper Juhl wrote:
> On 06/02/07, Oleg Verych <olecom@...wer.upol.cz> wrote:
> >scripts: replace gawk, head, bc with shell, update
> >
> >  Replacing overhead of using some (external) programs
> >  instead of good old `sh'.
> >
> >Cc: Roman Zippel <zippel@...ux-m68k.org>
> >Cc: Sam Ravnborg <sam@...nborg.org>
> >Cc: William Stearns <wstearns@...ox.com>
> >Cc: Martin Schlemmer <azarah@...feratu.za.org>
> >Signed-off-by: Oleg Verych <olecom@...wer.upol.cz>
> >---
> >
> > Whitespace cleanup included.
> >
> > scripts/gen_initramfs_list.sh | 43 
> > +++++++++++++++++++++---------------------
> > scripts/makelst               | 34 ++++++++++++++++-----------------
> > 2 files changed, 39 insertions(+), 38 deletions(-)
> >
> >Index: linux-2.6.20/scripts/makelst
> >===================================================================
> >--- linux-2.6.20.orig/scripts/makelst   2007-02-06 02:12:38.811908000 +0100
> >+++ linux-2.6.20/scripts/makelst        2007-02-06 02:12:43.688212750 +0100
> >@@ -1,31 +1,31 @@
> >-#!/bin/bash
> >+#!/bin/sh
> 
> I don't like this change much.  We don't know what shell /bin/sh is on
> a random users system - much better to be explicit and make sure we
> use/require bash.
> I expect this change to cause pain for users who have zsh, csh, ksh,
> ash or some other shell as /bin/sh but also have /bin/bash available.
> Previously things would just work, but now it will possibly break due
> to using a different shell.


I've tested on dash, that is `sh'. Everybody is welcome to test on his
favorite `/bin/sh' compatible shell.

It's very unclear from bash man page, where are extentions, and where are
common features. That particular script is small and non-bash oriented,
unlike gen_initramfs_list.sh [s/sh/bash].

Thus it's OK, even in scope of SUSv3 "incompatible" "%ul" in `printf'
(see my other reply on that).

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