linux-kernel - Re: script relative shebang

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Message-ID: <1464783168.2464.54.camel@petrovitsch.priv.at>
Date:	Wed, 01 Jun 2016 14:12:48 +0200
From:	Bernd Petrovitsch <bernd@...rovitsch.priv.at>
To:	Boris <ribalkin@...il.com>, Nicolai Stange <nicstange@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: script relative shebang

Hi all!

On Wed, 2016-06-01 at 09:00 +0100, Boris wrote:
[...]
> Yes, I think this is too ugly:
> 
> #!/usr/bin/gawk {exit system("/bin/sh -c 'exec \"$(dirname
> \"$0\")\"/subdir/catself \"$0\"' " FILENAME);}

The simplest solution for an application today is to provide a wrapper
script/program (to be placed in /usr/bin or /usr/local/bin) which knows
where to search for the applications executables - if adding some
directories to $PATH is not enough.

> Imagine you have that feature in your kernel would you rather use:
> 
> #!{dirname}/subdir/catself

And what if "{dirname}" (or any other character sequence) happens to be
a valid pathname?

> You second advice involves changing root fs which is not desirable in
> copy-deployment apps (bring all the dependencies)
> 
> This more about making kernel "user" friendly.

User-friendlyness is not the job of the kernel ...

[ Fullquote deleted as it's a bad habit ]

MfG,
	Bernd
-- 
Bernd Petrovitsch                  Email : bernd@...rovitsch.priv.at
                     LUGA : http://www.luga.at