linux-kernel - Re: [PATCH v3] selftests: use printf instead of echo -ne

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Message-ID: <CABXOdTdnntA=oU4==suO-DP-8S9zb0AhqtwekCRCbpOpku7MQg@mail.gmail.com>
Date:   Thu, 9 Feb 2023 08:19:36 -0800
From:   Guenter Roeck <groeck@...gle.com>
To:     Guillaume Tucker <guillaume.tucker@...labora.com>
Cc:     Shuah Khan <shuah@...nel.org>,
        Gautam <gautammenghani201@...il.com>,
        David Laight <David.Laight@...lab.com>, kernel@...labora.com,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernelci@...ts.linux.dev
Subject: Re: [PATCH v3] selftests: use printf instead of echo -ne

On Thu, Feb 9, 2023 at 12:55 AM Guillaume Tucker
<guillaume.tucker@...labora.com> wrote:
>
> Rather than trying to guess which implementation of "echo" to run with
> support for "-ne" options, use "printf" instead of "echo -ne".  It
> handles escape characters as a standard feature and it is widespread
> among modern shells.
>
> Reported-by: "kernelci.org bot" <bot@...nelci.org>
> Suggested-by: David Laight <David.Laight@...LAB.COM>
> Fixes: 3297a4df805d ("kselftests: Enable the echo command to print newlines in Makefile")
> Fixes: 79c16b1120fe ("selftests: find echo binary to use -ne options")
> Signed-off-by: Guillaume Tucker <guillaume.tucker@...labora.com>

Reviewed-by: Guenter Roeck <groeck@...omium.org>

> ---
>
> Notes:
>     v2: use printf insead of $(which echo)
>     v3: rebase on top of fix with $(which echo)
>
>  tools/testing/selftests/Makefile | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> index 9619d0f3b2ff..06578963f4f1 100644
> --- a/tools/testing/selftests/Makefile
> +++ b/tools/testing/selftests/Makefile
> @@ -234,11 +234,10 @@ ifdef INSTALL_PATH
>         @# While building kselftest-list.text skip also non-existent TARGET dirs:
>         @# they could be the result of a build failure and should NOT be
>         @# included in the generated runlist.
> -       ECHO=`which echo`; \
>         for TARGET in $(TARGETS); do \
>                 BUILD_TARGET=$$BUILD/$$TARGET;  \
> -               [ ! -d $(INSTALL_PATH)/$$TARGET ] && $$ECHO "Skipping non-existent dir: $$TARGET" && continue; \
> -               $$ECHO -ne "Emit Tests for $$TARGET\n"; \
> +               [ ! -d $(INSTALL_PATH)/$$TARGET ] && printf "Skipping non-existent dir: $$TARGET\n" && continue; \
> +               printf "Emit Tests for $$TARGET\n"; \
>                 $(MAKE) -s --no-print-directory OUTPUT=$$BUILD_TARGET COLLECTION=$$TARGET \
>                         -C $$TARGET emit_tests >> $(TEST_LIST); \
>         done;
> --
> 2.30.2
>
>