[PATCH mptcp-next 5/9] selftests: mptcp: join: create tmp files only if needed

[Matthieu Baerts <matthieu.baerts@tessares.net>]

These tmp files will only be created when a test will be launched.

This avoid 'dd' output when '-h' is used for example.

While at it, also avoid creating netns that will be removed when
starting the first test.

Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
---
 .../testing/selftests/net/mptcp/mptcp_join.sh | 37 ++++++++++++-------
 1 file changed, 24 insertions(+), 13 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index ce3e7db30b9d..5691221ca302 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -18,6 +18,7 @@ checksum=0
 ip_mptcp=0
 check_invert=0
 do_all_tests=1
+INIT=0
 
 TEST_COUNT=0
 ONLY_TESTS=()
@@ -41,7 +42,7 @@ CBPF_MPTCP_SUBOPTION_ADD_ADDR="14,
 			       6 0 0 65535,
 			       6 0 0 0"
 
-init()
+init_partial()
 {
 	capout=$(mktemp)
 
@@ -104,6 +105,21 @@ cleanup_partial()
 	done
 }
 
+init() {
+	INIT=1
+
+	sin=$(mktemp)
+	sout=$(mktemp)
+	cin=$(mktemp)
+	cinsent=$(mktemp)
+	cout=$(mktemp)
+
+	trap cleanup EXIT
+
+	make_file "$cin" "client" 1
+	make_file "$sin" "server" 1
+}
+
 cleanup()
 {
 	rm -f "$cin" "$cout" "$sinfail"
@@ -136,8 +152,13 @@ reset()
 		return 1
 	fi
 
-	cleanup_partial
-	init
+	if [ "${INIT}" != "1" ]; then
+		init
+	else
+		cleanup_partial
+	fi
+
+	init_partial
 
 	return 0
 }
@@ -2342,16 +2363,6 @@ usage()
 	exit ${ret}
 }
 
-sin=$(mktemp)
-sout=$(mktemp)
-cin=$(mktemp)
-cinsent=$(mktemp)
-cout=$(mktemp)
-init
-make_file "$cin" "client" 1
-make_file "$sin" "server" 1
-trap cleanup EXIT
-
 for arg in "$@"; do
 	# check for "capture/checksum" args before launching tests
 	if [[ "${arg}" =~ ^"-"[0-9a-zA-Z]*"c"[0-9a-zA-Z]*$ ]]; then
-- 
2.34.1