[PATCH v3 1/3] selftests: kselftest: avoid cd - in runner

[Pedro Falcato]

On Mon, Sep 28, 2026 at 06:27:42PM +0100, Pedro Falcato wrote:
> On Sat, Sep 26, 2026 at 10:08:17AM +0900, Hajime Tazaki wrote:
> > The kselftest runner currently uses `cd -` to restore its working
> > directory after running a test.
> > 
> > This is not supported by the minimal BusyBox hush shell used by some
> > NOMMU targets. Store the original directory explicitly and restore it
> > with a quoted path instead.
> > 
> > This also avoids printing the directory change performed by `cd -` and
> > handles paths containing whitespace correctly.
> > 
> > Cc: Shuah Khan <shuah at kernel.org>
> > Cc: Kees Cook <kees at kernel.org>
> > Cc: Andy Lutomirski <luto at amacapital.net>
> > Cc: Will Drewry <wad at chromium.org>
> > Cc: Mark Brown <broonie at kernel.org>
> > Cc: Brendan Jackman <brendan.jackman at linux.dev>
> > Cc: Hangbin Liu <liuhangbin at gmail.com>
> > Cc: "Ricardo B. Marliere" <rbm at suse.com>
> > Cc: linux-kselftest at vger.kernel.org
> > Cc: linux-um at lists.infradead.org
> > Cc: linux-mm at kvack.org
> > Signed-off-by: Hajime Tazaki <thehajime at gmail.com>
> 
> NACK.
> 
> https://pubs.opengroup.org/onlinepubs/009695099/utilities/cd.html
> 
> -
> When a hyphen is used as the operand, this shall be equivalent to the command:
> cd "$OLDPWD" && pwd
> 
> which changes to the previous working directory and then writes its name.
> 
> 
> If you're running selftests on !POSIX compliant shells, that's a
> you-issue. Fix the shell, or use something decent.

... I realize I was a bit too aggressive but seriously, lets not support
broken software, please?

-- 
Pedro