From: Masami Hiramatsu <mhiramat@kernel.org>
To: Xiao Yang <yangx.jy@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Shuah Khan <shuah@kernel.org>, <linux-kselftest@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
Tom Zanussi <tom.zanussi@linux.intel.com>,
Li Philip <philip.li@intel.com>,
Liu Yiding <yidingx.liu@intel.com>
Subject: Re: [PATCH 3/3] selftests/ftrace: Use /bin/echo instead of built-in echo
Date: Mon, 11 May 2020 18:27:52 +0900 [thread overview]
Message-ID: <20200511182752.c83f3454bcb3e205cf2bda4a@kernel.org> (raw)
In-Reply-To: <5EB8FD31.9020906@cn.fujitsu.com>
On Mon, 11 May 2020 15:22:25 +0800
Xiao Yang <yangx.jy@cn.fujitsu.com> wrote:
> On 2020/5/7 17:15, Masami Hiramatsu wrote:
> > On Thu, 7 May 2020 14:45:16 +0800
> > Xiao Yang<yangx.jy@cn.fujitsu.com> wrote:
> >
> >> On 2020/5/1 21:38, Masami Hiramatsu wrote:
> >>> Since the built-in echo has different behavior in POSIX shell
> >>> (dash) and bash, we forcibly use /bin/echo -E (not interpret
> >>> backslash escapes) by default.
> >>>
> >>> This also fixes some test cases which expects built-in
> >>> echo command.
> >>>
> >>> Reported-by: Liu Yiding<yidingx.liu@intel.com>
> >>> Signed-off-by: Masami Hiramatsu<mhiramat@kernel.org>
> >>> ---
> >>> tools/testing/selftests/ftrace/test.d/functions | 3 +++
> >>> .../test.d/trigger/trigger-trace-marker-hist.tc | 2 +-
> >>> .../trigger-trace-marker-synthetic-kernel.tc | 4 ++++
> >>> .../trigger/trigger-trace-marker-synthetic.tc | 4 ++--
> >>> 4 files changed, 10 insertions(+), 3 deletions(-)
> >>>
> >>> diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions
> >>> index 5d4550591ff9..ea59b6ea2c3e 100644
> >>> --- a/tools/testing/selftests/ftrace/test.d/functions
> >>> +++ b/tools/testing/selftests/ftrace/test.d/functions
> >>> @@ -1,3 +1,6 @@
> >>> +# Since the built-in echo has different behavior in POSIX shell (dash) and
> >>> +# bash, we forcibly use /bin/echo -E (not interpret backslash escapes).
> >>> +alias echo="/bin/echo -E"
> >> Hi Masami, Steven
> >>
> >> It seems that only kprobe_syntax_errors.tc is impacted by the issue
> >> currently. Is it necessary for all tests to use /bin/echo and could we
> >> just make kprobe_syntax_errors.tc use /bin/echo?
> >
> > Yes, I would like to unify the "echo"'s behavior among the testcases
> > instead of patching each failure in the future.
> > Or would you have any concern on it?
> Hi Masami,
>
> Very sorry for the late reply.
>
> We may not avoid fixing related failures after your change:
> 1) We have to reuse built-in echo (do alias echo=echo) if we want to
> test common_pid for histogram.
> 2) We have to reuse built-in echo if some new tests want to interpret
> backslash escapes in future.
1) yes, that's what I need to do for avoiding "pid" key histogram
(but I think we should have better way to test it)
2) No, in that case you should use "/bin/echo -e" explicitly.
dash's built-in echo doesn't support it.
> Is it simple to provide two implementations of echo?(built-in echo and
> echo command?) and then just apply echo command for kprobe_syntax_errors.tc?
Hmm, OK, there might be another reason we reconsider this patch.
- Alisasing echo (this patch) can avoid dash related issues but
this also makes "echo" running in another process implicitly.
- Using /bin/echo for backslash explicitly will be missed unless
user runs it on dash, but it will keep "echo" in same process.
So both have pros/cons, but your idea will be locally effected.
OK, I'll retry it.
Thank you,
--
Masami Hiramatsu <mhiramat@kernel.org>
next prev parent reply other threads:[~2020-05-11 9:27 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-01 13:37 [PATCH 0/3] selftests/ftrace: Fix ftracetest testcases for dash, etc Masami Hiramatsu
2020-05-01 13:37 ` [PATCH 1/3] selftests/ftrace: Make XFAIL green color Masami Hiramatsu
2020-05-01 14:15 ` Steven Rostedt
2020-05-01 13:37 ` [PATCH 2/3] selftests/ftrace: Pick only the first kprobe event to test Masami Hiramatsu
2020-05-01 14:17 ` Steven Rostedt
2020-05-01 15:38 ` shuah
2020-05-01 16:20 ` Steven Rostedt
2020-05-01 16:30 ` Shuah Khan
2020-05-02 3:05 ` Masami Hiramatsu
2020-05-01 13:38 ` [PATCH 3/3] selftests/ftrace: Use /bin/echo instead of built-in echo Masami Hiramatsu
2020-05-01 14:19 ` Steven Rostedt
2020-05-02 3:08 ` Masami Hiramatsu
2020-05-07 13:12 ` Steven Rostedt
2020-05-07 15:50 ` Masami Hiramatsu
2020-05-07 17:25 ` Steven Rostedt
2020-05-07 20:32 ` Zanussi, Tom
2020-05-08 7:11 ` Masami Hiramatsu
2020-05-07 6:45 ` Xiao Yang
2020-05-07 9:15 ` Masami Hiramatsu
2020-05-11 7:22 ` Xiao Yang
2020-05-11 9:27 ` Masami Hiramatsu [this message]
2020-05-11 10:34 ` David Laight
2020-05-11 12:01 ` [PATCH] selftests/ftrace: Use /bin/echo for backslash included command Masami Hiramatsu
2020-05-11 12:19 ` Andreas Schwab
2020-05-11 13:36 ` [PATCH v2] selftests/ftrace: Use printf " Masami Hiramatsu
2020-05-11 13:38 ` Masami Hiramatsu
2020-05-11 13:46 ` David Laight
2020-05-11 14:05 ` Masami Hiramatsu
2020-05-11 14:59 ` David Laight
2020-05-11 20:28 ` Steven Rostedt
2020-05-11 13:42 ` Andreas Schwab
2020-05-11 13:58 ` Masami Hiramatsu
2020-05-25 9:59 ` Masami Hiramatsu
2020-05-28 16:24 ` Shuah Khan
2020-05-07 9:22 ` [PATCH 3/3] selftests/ftrace: Use /bin/echo instead of built-in echo Andreas Schwab
2020-05-07 15:52 ` Masami Hiramatsu
2020-05-01 14:21 ` [PATCH 0/3] selftests/ftrace: Fix ftracetest testcases for dash, etc Steven Rostedt
2020-05-01 14:28 ` Shuah Khan
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