selftests: Extract single-test shell logic from lib.mk

In order to improve the reusability of the kselftest test running logic,
this extracts the single-test logic from lib.mk into kselftest/runner.sh
which lib.mk can call directly. No changes in output.

As part of the change, this moves the "summary" Makefile logic around
to set a new "logfile" output. This will be used again in the future
"emit_tests" target as well.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/.gitignore

-kselftest
 gpiogpio-event-mon
 gpiogpio-hammer
 gpioinclude/

tools/testing/selftests/kselftest/runner.sh

+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# Runs a set of tests in a given subdirectory.
+export skip_rc=4
+export logfile=/dev/stdout
+
+run_one()
+{
+	TEST="$1"
+	NUM="$2"
+
+	BASENAME_TEST=$(basename $TEST)
+
+	TEST_HDR_MSG="selftests: "`basename $PWD`:" $BASENAME_TEST"
+	echo "$TEST_HDR_MSG"
+	echo "========================================"
+	if [ ! -x "$TEST" ]; then
+		echo "$TEST_HDR_MSG: Warning: file $TEST is not executable, correct this."
+		echo "not ok 1..$test_num $TEST_HDR_MSG [FAIL]"
+	else
+		cd `dirname $TEST` > /dev/null
+		(./$BASENAME_TEST >> "$logfile" 2>&1 &&
+		echo "ok 1..$test_num $TEST_HDR_MSG [PASS]") ||
+		(if [ $? -eq $skip_rc ]; then	\
+			echo "not ok 1..$test_num $TEST_HDR_MSG [SKIP]"
+		else
+			echo "not ok 1..$test_num $TEST_HDR_MSG [FAIL]"
+		fi)
+		cd - >/dev/null
+	fi
+}

tools/testing/selftests/lib.mk

@@ -14,6 +14,7 @@ ifeq (0,$(MAKELEVEL))
 	endif
     endif
 endif
+selfdir = $(realpath $(dir $(filter %/lib.mk,$(MAKEFILE_LIST))))
 
 # The following are built by lib.mk common compile rules.
 # TEST_CUSTOM_PROGS should be used by tests that require
@@ -65,43 +66,19 @@ all: $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) $(TEST_GEN_FILES)
 endif
 
 .ONESHELL:
-define RUN_TEST_PRINT_RESULT
-	TEST_HDR_MSG="selftests: "`basename $$PWD`:" $$BASENAME_TEST";	\
-	echo $$TEST_HDR_MSG;					\
-	echo "========================================";	\
-	if [ ! -x $$TEST ]; then	\
-		echo "$$TEST_HDR_MSG: Warning: file $$BASENAME_TEST is not executable, correct this.";\
-		echo "not ok 1..$$test_num $$TEST_HDR_MSG [FAIL]"; \
-	else					\
-		cd `dirname $$TEST` > /dev/null; \
-		if [ "X$(summary)" != "X" ]; then	\
-			(./$$BASENAME_TEST > /tmp/$$BASENAME_TEST 2>&1 && \
-			echo "ok 1..$$test_num $$TEST_HDR_MSG [PASS]") || \
-			(if [ $$? -eq $$skip ]; then	\
-				echo "not ok 1..$$test_num $$TEST_HDR_MSG [SKIP]";				\
-			else echo "not ok 1..$$test_num $$TEST_HDR_MSG [FAIL]";					\
-			fi;)			\
-		else				\
-			(./$$BASENAME_TEST &&	\
-			echo "ok 1..$$test_num $$TEST_HDR_MSG [PASS]") ||						\
-			(if [ $$? -eq $$skip ]; then \
-				echo "not ok 1..$$test_num $$TEST_HDR_MSG [SKIP]"; \
-			else echo "not ok 1..$$test_num $$TEST_HDR_MSG [FAIL]";				\
-			fi;)		\
-		fi;				\
-		cd - > /dev/null;		\
-	fi;
-endef
-
 define RUN_TESTS
 	@export KSFT_TAP_LEVEL=`echo 1`;		\
 	test_num=`echo 0`;				\
-	skip=`echo 4`;					\
+	. $(selfdir)/kselftest/runner.sh;		\
 	echo "TAP version 13";				\
 	for TEST in $(1); do				\
 		BASENAME_TEST=`basename $$TEST`;	\
 		test_num=`echo $$test_num+1 | bc`;	\
-		$(call RUN_TEST_PRINT_RESULT,$(TEST),$(BASENAME_TEST),$(test_num),$(skip))						\
+		if [ "X$(summary)" != "X" ]; then	\
+		        logfile="/tmp/$$BASENAME_TEST";	\
+			cat /dev/null > "$$logfile";	\
+		fi;					\
+		run_one "$$BASENAME_TEST" "$$test_num";	\
 	done;
 endef