linux-kernel - Re: [PATCH] selftests: find echo binary to use -ne options

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Message-ID: <51e62348-9e8e-2769-6372-f217f894a917@collabora.com>
Date:   Sat, 4 Feb 2023 14:36:39 +0100
From:   Guillaume Tucker <guillaume.tucker@...labora.com>
To:     David Laight <David.Laight@...LAB.COM>,
        Shuah Khan <shuah@...nel.org>,
        Gautam <gautammenghani201@...il.com>
Cc:     "kernel@...labora.com" <kernel@...labora.com>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernelci@...ts.linux.dev" <kernelci@...ts.linux.dev>
Subject: Re: [PATCH] selftests: find echo binary to use -ne options

On 04/02/2023 14:04, David Laight wrote:
> From: Guillaume Tucker
>> Sent: 03 February 2023 15:26
>>
>> Find the actual echo binary using $(which echo) and use it for
>> formatted output with -ne.  On some systems, the default echo command
>> doesn't handle the -e option and the output looks like this (arm64
>> build):
>>
>> -ne Emit Tests for alsa
>>
>> -ne Emit Tests for amd-pstate
>>
>> -ne Emit Tests for arm64
> 
> Nack.
> There is no reason to suppose that /bin/echo is any different from
> the version of echo builtin to the shell that make uses.
> 
> Not only that 'which' is a horrid shell script that is trying to
> emulate csh builtin.
> The bourne shell equivalent is 'type' and the posix one 'command'.
> 
> In any case the portable way to fix this is to use printf.
> This is a well defined program and is bultin to all modern shells.

Ah great, thanks for the review.  Will send a v2 with printf.

Guillaume

>> This is for example the case with the KernelCI Docker images
>> e.g. kernelci/gcc-10:x86-kselftest-kernelci.  With the actual echo
>> binary (e.g. in /bin/echo), the output is formatted as expected (x86
>> build this time):
>>
>> Emit Tests for alsa
>> Emit Tests for amd-pstate
>> Skipping non-existent dir: arm64
>>
>> Only the install target is using "echo -ne" so keep the $ECHO variable
>> local to it.
>>
>> Reported-by: "kernelci.org bot" <bot@...nelci.org>
>> Fixes: 3297a4df805d ("kselftests: Enable the echo command to print newlines in Makefile")
>> Signed-off-by: Guillaume Tucker <guillaume.tucker@...labora.com>
>> ---
>>  tools/testing/selftests/Makefile | 5 +++--
>>  1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
>> index 41b649452560..9619d0f3b2ff 100644
>> --- a/tools/testing/selftests/Makefile
>> +++ b/tools/testing/selftests/Makefile
>> @@ -234,10 +234,11 @@ 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 ] && $$ECHO "Skipping non-existent dir: $$TARGET" &&
>> continue; \
>> +		$$ECHO -ne "Emit Tests for $$TARGET\n"; \
>>  		$(MAKE) -s --no-print-directory OUTPUT=$$BUILD_TARGET COLLECTION=$$TARGET \
>>  			-C $$TARGET emit_tests >> $(TEST_LIST); \
>>  	done;
>> --
>> 2.30.2
> 
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