linux-kernel - Re: Broken /usr/bin/env (invalid option)

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Message-ID: <20201209162020.GA15684@nautica>
Date:   Wed, 9 Dec 2020 17:20:20 +0100
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kbuild@...r.kernel.org
Subject: Re: Broken /usr/bin/env (invalid option)

Krzysztof Kozlowski wrote on Wed, Dec 09, 2020:
> > Hm, what version of env is that?
> > I only checked on a couple of systems that env -S exists, but it might
> > not be available (e.g. now I'm looking, at least busybox env does not
> > provide -S)
> 
> $ env --version
> env (GNU coreutils) 8.25

Ok, so this is a much newer option than I thought it was, sorry for my
lack of checking.
I know we no longer support older gccs but it's probably best to keep
supporting this.

> > I don't see any way to make this work out of the box for me (awk not in
> > /usr/bin) and you (env not supporting -S), but I guess I can keep that
> > patch around locally...
> 
> You could add a wrapper which uses PATH or searches for the awk...
> kind of reimplement other tools. Another solution is to clearly
> document the requirements for the build system and explicitly say that
> older systems like four-year Ubuntu are not supported.

Well there definitely are ways, but I'm not sure it's worth it...
For example another idea is just to use /bin/sh (which is mandated to
exist) and have it invoke awk, the script is short enough to just quote
it.


Yamada-san, how about this instead?
But to be honest I'm fine with dropping my patch altogether, I'll work
around it locally if it's too much.
---
>From d53ef3b4c55aa2ea5f9ae887b3e1ace368f30f66 Mon Sep 17 00:00:00 2001
From: Dominique Martinet <asmadeus@...ewreck.org>
Date: Wed, 15 Jul 2020 16:00:13 +0200
Subject: [PATCH] ld-version: use /bin/sh then awk for shebank

/usr/bin/awk is not garanteed to exist (and doesn't on e.g. nixos),
using /bin/sh and invoking awk to have it look in PATH is more robust.

Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>

diff --git a/scripts/ld-version.sh b/scripts/ld-version.sh
index f2be0ff9a738..02dbad7b5613 100755
--- a/scripts/ld-version.sh
+++ b/scripts/ld-version.sh
@@ -1,11 +1,11 @@
-#!/usr/bin/awk -f
+#!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
 # extract linker version number from stdin and turn into single number
-       {
+awk '{
        gsub(".*\\)", "");
        gsub(".*version ", "");
        gsub("-.*", "");
        split($1,a, ".");
        print a[1]*100000000 + a[2]*1000000 + a[3]*10000;
        exit
-       }
+}'