[PATCH AUTOSEL 5.15 17/24] selftests/net: Find nettest in current directory

[Sasha Levin <sashal@kernel.org>]

From: Daniel Díaz <daniel.diaz@linaro.org>

[ Upstream commit bd5e1e42826f18147afb0ba07e6a815f52cf8bcb ]

The `nettest` binary, built from `selftests/net/nettest.c`,
was expected to be found in the path during test execution of
`fcnal-test.sh` and `pmtu.sh`, leading to tests getting
skipped when the binary is not installed in the system, as can
be seen in these logs found in the wild [1]:

  # TEST: vti4: PMTU exceptions                                         [SKIP]
  [  350.600250] IPv6: ADDRCONF(NETDEV_CHANGE): veth_b: link becomes ready
  [  350.607421] IPv6: ADDRCONF(NETDEV_CHANGE): veth_a: link becomes ready
  # 'nettest' command not found; skipping tests
  #   xfrm6udp not supported
  # TEST: vti6: PMTU exceptions (ESP-in-UDP)                            [SKIP]
  [  351.605102] IPv6: ADDRCONF(NETDEV_CHANGE): veth_b: link becomes ready
  [  351.612243] IPv6: ADDRCONF(NETDEV_CHANGE): veth_a: link becomes ready
  # 'nettest' command not found; skipping tests
  #   xfrm4udp not supported

The `unicast_extensions.sh` tests also rely on `nettest`, but
it runs fine there because it looks for the binary in the
current working directory [2]:

The same mechanism that works for the Unicast extensions tests
is here copied over to the PMTU and functional tests.

[1] https://lkft.validation.linaro.org/scheduler/job/5839508#L6221
[2] https://lkft.validation.linaro.org/scheduler/job/5839508#L7958

Signed-off-by: Daniel Díaz <daniel.diaz@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/testing/selftests/net/fcnal-test.sh | 11 +++++++----
 tools/testing/selftests/net/pmtu.sh       | 10 ++++++----
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/tools/testing/selftests/net/fcnal-test.sh b/tools/testing/selftests/net/fcnal-test.sh
index 91f54112167f..364c82b797c1 100755
--- a/tools/testing/selftests/net/fcnal-test.sh
+++ b/tools/testing/selftests/net/fcnal-test.sh
@@ -4072,10 +4072,13 @@ elif [ "$TESTS" = "ipv6" ]; then
 	TESTS="$TESTS_IPV6"
 fi
 
-which nettest >/dev/null
-if [ $? -ne 0 ]; then
-	echo "'nettest' command not found; skipping tests"
-	exit $ksft_skip
+# nettest can be run from PATH or from same directory as this selftest
+if ! which nettest >/dev/null; then
+	PATH=$PWD:$PATH
+	if ! which nettest >/dev/null; then
+		echo "'nettest' command not found; skipping tests"
+		exit $ksft_skip
+	fi
 fi
 
 declare -i nfail=0
diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh
index 694732e4b344..da6ab300207c 100755
--- a/tools/testing/selftests/net/pmtu.sh
+++ b/tools/testing/selftests/net/pmtu.sh
@@ -671,10 +671,12 @@ setup_xfrm() {
 }
 
 setup_nettest_xfrm() {
-	which nettest >/dev/null
-	if [ $? -ne 0 ]; then
-		echo "'nettest' command not found; skipping tests"
-	        return 1
+	if ! which nettest >/dev/null; then
+		PATH=$PWD:$PATH
+		if ! which nettest >/dev/null; then
+			echo "'nettest' command not found; skipping tests"
+			return 1
+		fi
 	fi
 
 	[ ${1} -eq 6 ] && proto="-6" || proto=""
-- 
2.35.1