linux-kernel - Re: [PATCH] perf test: Change to use bash for daemon test

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Date:   Wed, 24 Mar 2021 10:45:22 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf test: Change to use bash for daemon test

Hi Leo,

On Sat, Mar 20, 2021 at 7:46 PM Leo Yan <leo.yan@...aro.org> wrote:
>
> When executed the daemon test on Arm64 and x86 with Debian (Buster)
> distro, both skip the test case with the log:
>
>   # ./perf test -v 76
>   76: daemon operations                                               :
>   --- start ---
>   test child forked, pid 11687
>   test daemon list
>   trap: SIGINT: bad trap
>   ./tests/shell/daemon.sh: 173: local: cpu-clock: bad variable name
>   test child finished with -2
>   ---- end ----
>   daemon operations: Skip
>
> So the error happens for the variable expansion when use local variable
> in the shell script.  Since Debian Buster uses dash but not bash as
> non-interactive shell, when execute the daemon testing, it hits a
> known issue for dash which was reported [1].
>
> To resolve this issue, one option is to add double quotes for all local
> variables assignment, so need to change the code from:
>
>   local line=`perf daemon --config ${config} -x: | head -2 | tail -1`
>
>   ... to:
>
>   local line="`perf daemon --config ${config} -x: | head -2 | tail -1`"
>
> But the testing script has bunch of local variables, this leads to big
> changes for whole script.
>
> On the other hand, the testing script asks to use the "local" feature
> which is bash-specific, so this patch explicitly uses "#!/bin/bash" to
> ensure running the script with bash.
>
> After:
>
>   # ./perf test -v 76
>   76: daemon operations                                               :
>   --- start ---
>   test child forked, pid 11329
>   test daemon list
>   test daemon reconfig
>   test daemon stop
>   test daemon signal
>   signal 12 sent to session 'test [11596]'
>   signal 12 sent to session 'test [11596]'
>   test daemon ping
>   test daemon lock
>   test child finished with 0
>   ---- end ----
>   daemon operations: Ok
>
> [1] https://bugs.launchpad.net/ubuntu/+source/dash/+bug/139097
>
> Fixes: 2291bb915b55 ("perf tests: Add daemon 'list' command test")
> Signed-off-by: Leo Yan <leo.yan@...aro.org>

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung


> ---
>  tools/perf/tests/shell/daemon.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/tests/shell/daemon.sh b/tools/perf/tests/shell/daemon.sh
> index ee4a30ca3f57..45fc24af5b07 100755
> --- a/tools/perf/tests/shell/daemon.sh
> +++ b/tools/perf/tests/shell/daemon.sh
> @@ -1,4 +1,4 @@
> -#!/bin/sh
> +#!/bin/bash
>  # daemon operations
>  # SPDX-License-Identifier: GPL-2.0
>
> --
> 2.25.1
>