linux-kernel - Re: [PATCH] selftests/run_kselftest.sh: Use readlink if realpath is not available

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Message-ID: <42f679b4fac5f6425232e4873acb00d50a5fb8e3@linux.dev>
Date: Sat, 29 Mar 2025 19:48:52 +0000
From: "Yosry Ahmed" <yosry.ahmed@...ux.dev>
To: "Shuah Khan" <skhan@...uxfoundation.org>, "Shuah Khan" <shuah@...nel.org>
Cc: linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org, "Shuah
 Khan" <skhan@...uxfoundation.org>
Subject: Re: [PATCH] selftests/run_kselftest.sh: Use readlink if realpath is
 not available

March 28, 2025 at 10:05 PM, "Shuah Khan" <skhan@...uxfoundation.org> wrote:
> 
> On 3/18/25 10:05, Yosry Ahmed wrote:
> 
> > 'realpath' is not always available, fallback to 'readlink -f' if is not
> >  available. They seem to work equally well in this context.
> 
> Can you add more specifics on "realpath" is not always available,"
> No issues with the patch itself. I would like to know the cases
> where "realpath" command is missing.

Not all distros have realpath. In my case, it was an internal distro we use on some test machines, so I can't really share much details about it.

Thanks.

> > 
> > Signed-off-by: Yosry Ahmed <yosry.ahmed@...ux.dev>
> >  ---
> >  tools/testing/selftests/run_kselftest.sh | 9 ++++++++-
> >  1 file changed, 8 insertions(+), 1 deletion(-)
> >  diff --git a/tools/testing/selftests/run_kselftest.sh b/tools/testing/selftests/run_kselftest.sh
> >  index 50e03eefe7ac7..0443beacf3621 100755
> >  --- a/tools/testing/selftests/run_kselftest.sh
> >  +++ b/tools/testing/selftests/run_kselftest.sh
> >  @@ -3,7 +3,14 @@
> >  #
> >  # Run installed kselftest tests.
> >  #
> >  -BASE_DIR=$(realpath $(dirname $0))
> >  +
> >  +# Fallback to readlink if realpath is not available
> >  +if which realpath > /dev/null; then
> >  + BASE_DIR=$(realpath $(dirname $0))
> >  +else
> >  + BASE_DIR=$(readlink -f $(dirname $0))
> >  +fi
> >  +
> >  cd $BASE_DIR
> >  TESTS="$BASE_DIR"/kselftest-list.txt
> >  if [ ! -r "$TESTS" ] ; then
> 
> thanks,
> 
> -- Shuah
>