netdev - Re: [PATCH RFC net-next 05/13] selftests: forwarding: add TCPDUMP_EXTRA

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Date:   Tue, 12 Apr 2022 09:39:57 +0200
From:   Joachim Wiberg <troglobit@...il.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        "netdev\@vger.kernel.org" <netdev@...r.kernel.org>,
        "bridge\@lists.linux-foundation.org" 
        <bridge@...ts.linux-foundation.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Tobias Waldekranz <tobias@...dekranz.com>
Subject: Re: [PATCH RFC net-next 05/13] selftests: forwarding: add TCPDUMP_EXTRA_FLAGS to lib.sh

On Mon, Apr 11, 2022 at 17:20, Vladimir Oltean <vladimir.oltean@....com> wrote:
> On Mon, Apr 11, 2022 at 03:38:29PM +0200, Joachim Wiberg wrote:
>> -	$ns_cmd tcpdump -e -n -Q in -i $if_name \
>> +	if [ -z $TCPDUMP_EXTRA_FLAGS ]; then
>> +		extra_flags=""
>> +	else
>> +		extra_flags="$TCPDUMP_EXTRA_FLAGS"
>> +	fi
>> +
>> +	$ns_cmd tcpdump $extra_flags -e -n -Q in -i $if_name \
>
> Could you call directly "$ns_cmd tcpdump $TCPDUMP_EXTRA_FLAGS ..." here,
> without an intermediary "extra_flags" global variable which holds the
> same content?
>
> You could initialize it just like the way other variables are
> initialized, at the beginning of lib.sh:
>
> TCPDUMP_EXTRA_FLAGS=${TCPDUMP_EXTRA_FLAGS:=}

Ah, yes of course.  Will fix in the next drop!

 /J