From:   Guillaume Tucker <guillaume.tucker@collabora.com>
To:     Guillaume Tucker <guillaume.tucker@gmail.com>,
        Shuah Khan <shuah@kernel.org>,
        Gautam <gautammenghani201@gmail.com>
Cc:     kernel@collabora.com, linux-kselftest@vger.kernel.org,
        linux-kernel@vger.kernel.org, kernelci@lists.linux.dev
Subject: [PATCH] selftests: find echo binary to use -ne options
Date:   Fri,  3 Feb 2023 16:26:03 +0100
Message-Id: <20230203152603.11450-1-guillaume.tucker@collabora.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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

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@kernelci.org>
Fixes: 3297a4df805d ("kselftests: Enable the echo command to print newlines in Makefile")
Signed-off-by: Guillaume Tucker <guillaume.tucker@collabora.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