linux-kernel - Re: [PATCH 1/2] tools: kernel-chktaint: Fix bashism, simplify code

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Date: Fri, 21 Jun 2024 22:15:21 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Petr Vorel <pvorel@...e.cz>, linux-kernel@...r.kernel.org
Cc: Thorsten Leemhuis <linux@...mhuis.info>, Jonathan Corbet
 <corbet@....net>, Jiri Olsa <jolsa@...nel.org>,
 Shuah Khan <skhan@...uxfoundation.org>, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 1/2] tools: kernel-chktaint: Fix bashism, simplify code



On 6/18/24 2:06 AM, Petr Vorel wrote:
> '==' is bashism, '=' needs to be used for comparison.
> With this fix script can work on systems where the default shell is
> dash, busybox ash or any other strictly POSIX compatible shell.
> 
> While at it, also improve:
> * remove "x" in the comparison (not needed for decades)
> * use $# for checking number of arguments
> * cleanup whitespace
> 
> Fixes: 4ab5a5d2a4a22 ("tools: add a kernel-chktaint to tools/debugging")
> Signed-off-by: Petr Vorel <pvorel@...e.cz>

Acked-by: Randy Dunlap <rdunlap@...radead.org>

Thanks.

> ---
>  tools/debugging/kernel-chktaint | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/debugging/kernel-chktaint b/tools/debugging/kernel-chktaint
> index 279be06332be9..adbb1d621ccd4 100755
> --- a/tools/debugging/kernel-chktaint
> +++ b/tools/debugging/kernel-chktaint
> @@ -18,11 +18,11 @@ retrieved from /proc/sys/kernel/tainted on another system.
>  EOF
>  }
>  
> -if [ "$1"x != "x" ]; then
> -	if  [ "$1"x == "--helpx" ] || [ "$1"x == "-hx" ] ; then
> +if [ $# -gt 0 ]; then
> +	if  [ "$1" = "--help" ] || [ "$1" = "-h" ]; then
>  		usage
>  		exit 1
> -	elif  [ $1 -ge 0 ] 2>/dev/null ; then
> +	elif  [ $1 -ge 0 ] 2>/dev/null; then
>  		taint=$1
>  	else
>  		echo "Error: Parameter '$1' not a positive integer. Aborting." >&2

-- 
~Randy