linux-kernel - Re: [PATCH] kbuild: use a pipe rather than process substitution

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Date:   Fri, 10 Jun 2022 21:40:00 +0000
From:   Alvin Šipraga <ALSI@...g-olufsen.dk>
To:     Alvin Šipraga <alvin@...s.dk>
CC:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        "linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>
Subject: Re: [PATCH] kbuild: use a pipe rather than process substitution

On Fri, Jun 10, 2022 at 11:34:52PM +0200, Alvin Šipraga wrote:
> From: Alvin Šipraga <alsi@...g-olufsen.dk>
> 
> Bash process substitution of the form `foo < <(bar)`, as found in
> scripts/check-local-export, can cause issues in chrooted environments
> and with tools such as pseudo. The blamed commit started to cause build
> errors for me when using the Yocto project's devshell environment;
> devshell uses pseudo internally:
> 
> .../scripts/check-local-export: line 51: /dev/fd/63: No such file or directory
> 
> Replace the process substitution with a simple pipe into the while loop.
> This is functionally equivalent and more portable than the former. Note
> that pipefail is enabled so that the script terminates when ${NM} fails.
> 
> Link: https://bugzilla.yoctoproject.org/show_bug.cgi?id=13288
> Fixes: 31cb50b5590f ("kbuild: check static EXPORT_SYMBOL* by script instead of modpost")
> Signed-off-by: Alvin Šipraga <alsi@...g-olufsen.dk>

Oops, I forgot to check the linux-kbuild list before sending this patch. I see
that a more robust patch has been posted which addresses a separate issue, but
which also solves the issue I was trying to address:

https://lore.kernel.org/linux-kbuild/20220608011100.486735-1-masahiroy@kernel.org/raw

Please ignore this. Thanks!

Kind regards,
Alvin