[PATCH] tools/testing: add kselftest shell helper library

[Willem de Bruijn <willemdebruijn.kernel@gmail.com>]

From: Willem de Bruijn <willemb@google.com>

Kselftest expects processes to signal pass/fail/skip through exitcode.

C programs can include kselftest.h for readable definitions.

Add analogous kselftest.sh for shell tests. Extract the existing
definitions from udpgso_bench.sh.

Tested: make TARGETS=net kselftest
Link: https://patchwork.kernel.org/project/netdevbpf/patch/20201113231655.139948-4-acardace@redhat.com/
Signed-off-by: Willem de Bruijn <willemb@google.com>

---

applies cleanly to netnext (f9e425e99b07) and kselftest (v5.10-rc1)
---
 tools/testing/selftests/kselftest.sh        | 52 +++++++++++++++++++++
 tools/testing/selftests/net/udpgso_bench.sh | 42 +----------------
 2 files changed, 53 insertions(+), 41 deletions(-)
 create mode 100644 tools/testing/selftests/kselftest.sh

diff --git a/tools/testing/selftests/kselftest.sh b/tools/testing/selftests/kselftest.sh
new file mode 100644
index 000000000000..c5a1cff57402
--- /dev/null
+++ b/tools/testing/selftests/kselftest.sh
@@ -0,0 +1,52 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# kselftest shell test support library
+#
+# - Define pass/fail/skip exitcodes
+# - Multiprocess support: aggregate child process results
+
+readonly KSFT_PASS=0
+readonly KSFT_FAIL=1
+readonly KSFT_SKIP=4
+
+readonly GREEN='\033[0;92m'
+readonly YELLOW='\033[0;33m'
+readonly RED='\033[0;31m'
+readonly NC='\033[0m' # No Color
+
+num_pass=0
+num_err=0
+num_skip=0
+
+# Test child process exit code, add to aggregates.
+kselftest_test_exitcode() {
+	local -r exitcode=$1
+
+	if [[ ${exitcode} -eq ${KSFT_PASS} ]]; then
+		num_pass=$(( $num_pass + 1 ))
+	elif [[ ${exitcode} -eq ${KSFT_SKIP} ]]; then
+		num_skip=$(( $num_skip + 1 ))
+	else
+		num_err=$(( $num_err + 1 ))
+	fi
+}
+
+# Exit from main process.
+kselftest_exit() {
+	echo -e "$(basename $0): PASS=${num_pass} SKIP=${num_skip} FAIL=${num_err}"
+
+	if [[ $num_err -ne 0 ]]; then
+		echo -e "$(basename $0): ${RED}FAIL${NC}"
+		exit ${KSFT_FAIL}
+	fi
+
+	if [[ $num_skip -ne 0 ]]; then
+		echo -e "$(basename $0): ${YELLOW}SKIP${NC}"
+		exit ${KSFT_SKIP}
+	fi
+
+	echo -e "$(basename $0): ${GREEN}PASS${NC}"
+	exit ${KSFT_PASS}
+}
+
diff --git a/tools/testing/selftests/net/udpgso_bench.sh b/tools/testing/selftests/net/udpgso_bench.sh
index 80b5d352702e..c1f9affe6cf0 100755
--- a/tools/testing/selftests/net/udpgso_bench.sh
+++ b/tools/testing/selftests/net/udpgso_bench.sh
@@ -3,47 +3,7 @@
 #
 # Run a series of udpgso benchmarks
 
-readonly GREEN='\033[0;92m'
-readonly YELLOW='\033[0;33m'
-readonly RED='\033[0;31m'
-readonly NC='\033[0m' # No Color
-
-readonly KSFT_PASS=0
-readonly KSFT_FAIL=1
-readonly KSFT_SKIP=4
-
-num_pass=0
-num_err=0
-num_skip=0
-
-kselftest_test_exitcode() {
-	local -r exitcode=$1
-
-	if [[ ${exitcode} -eq ${KSFT_PASS} ]]; then
-		num_pass=$(( $num_pass + 1 ))
-	elif [[ ${exitcode} -eq ${KSFT_SKIP} ]]; then
-		num_skip=$(( $num_skip + 1 ))
-	else
-		num_err=$(( $num_err + 1 ))
-	fi
-}
-
-kselftest_exit() {
-	echo -e "$(basename $0): PASS=${num_pass} SKIP=${num_skip} FAIL=${num_err}"
-
-	if [[ $num_err -ne 0 ]]; then
-		echo -e "$(basename $0): ${RED}FAIL${NC}"
-		exit ${KSFT_FAIL}
-	fi
-
-	if [[ $num_skip -ne 0 ]]; then
-		echo -e "$(basename $0): ${YELLOW}SKIP${NC}"
-		exit ${KSFT_SKIP}
-	fi
-
-	echo -e "$(basename $0): ${GREEN}PASS${NC}"
-	exit ${KSFT_PASS}
-}
+source "$(dirname $0)/../kselftest.sh"
 
 wake_children() {
 	local -r jobs="$(jobs -p)"
-- 
2.29.2.454.gaff20da3a2-goog