[SRU][F][PATCH 1/1] selftests/net: Find nettest in current directory

[Luke Nowakowski-Krijger]

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

BugLink: https://bugs.launchpad.net/bugs/2006391

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 at linaro.org>
Signed-off-by: David S. Miller <davem at davemloft.net>
(backported from commit bd5e1e42826f18147afb0)
[lukenow: skipped pmtu.sh as nettest in not used there in focal;
context adjustments with exit variable]
Signed-off-by: Luke Nowakowski-Krijger <luke.nowakowskikrijger at canonical.com>
---
 tools/testing/selftests/net/fcnal-test.sh | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/net/fcnal-test.sh b/tools/testing/selftests/net/fcnal-test.sh
index d2ac09b35dcf..f119d13e392c 100755
--- a/tools/testing/selftests/net/fcnal-test.sh
+++ b/tools/testing/selftests/net/fcnal-test.sh
@@ -3506,10 +3506,13 @@ elif [ "$TESTS" = "ipv6" ]; then
 	TESTS="$TESTS_IPV6"
 fi
 
-which nettest >/dev/null
-if [ $? -ne 0 ]; then
-	echo "'nettest' command not found; skipping tests"
-	exit 0
+# nettest can be run from PATH or from same directory as this selftest
+if ! which nettest >/dev/null; then
+	PATH=$PWD:$PATH
+	if ! which nettest >/dev/null; then
+		echo "'nettest' command not found; skipping tests"
+		exit 0
+	fi
 fi
 
 declare -i nfail=0
-- 
2.34.1