Merge branch 'selftests-net-lib-small-fixes'

Matthieu Baerts says:

====================
selftests: net: lib: small fixes

While looking at using 'lib.sh' for the MPTCP selftests [1], we found
some small issues with 'lib.sh'. Here they are:

- Patch 1: fix 'errexit' (set -e) support with busywait. 'errexit' is
  supported in some functions, not all. A fix for v6.8+.

- Patch 2: avoid confusing error messages linked to the cleaning part
  when the netns setup fails. A fix for v6.8+.

- Patch 3: set a variable as local to avoid accidentally changing the
  value of a another one with the same name on the caller side. A fix
  for v6.10-rc1+.

Link: https://lore.kernel.org/mptcp/5f4615c3-0621-43c5-ad25-55747a4350ce@kernel.org/T/ [1]
====================

Link: https://lore.kernel.org/r/20240605-upstream-net-20240605-selftests-net-lib-fixes-v1-0-b3afadd368c9@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/lib.sh

@@ -15,7 +15,7 @@ ksft_xfail=2
 ksft_skip=4
 
 # namespace list created by setup_ns
-NS_LIST=""
+NS_LIST=()
 
 ##############################################################################
 # Helpers
@@ -27,6 +27,7 @@ __ksft_status_merge()
 	local -A weights
 	local weight=0
 
+	local i
 	for i in "$@"; do
 		weights[$i]=$((weight++))
 	done
@@ -67,9 +68,7 @@ loopy_wait()
 	while true
 	do
 		local out
-		out=$("$@")
-		local ret=$?
-		if ((!ret)); then
+		if out=$("$@"); then
 			echo -n "$out"
 			return 0
 		fi
@@ -139,6 +138,7 @@ cleanup_ns()
 	fi
 
 	for ns in "$@"; do
+		[ -z "${ns}" ] && continue
 		ip netns delete "${ns}" &> /dev/null
 		if ! busywait $BUSYWAIT_TIMEOUT ip netns list \| grep -vq "^$ns$" &> /dev/null; then
 			echo "Warn: Failed to remove namespace $ns"
@@ -152,7 +152,7 @@ cleanup_ns()
 
 cleanup_all_ns()
 {
-	cleanup_ns $NS_LIST
+	cleanup_ns "${NS_LIST[@]}"
 }
 
 # setup netns with given names as prefix. e.g
@@ -161,7 +161,7 @@ setup_ns()
 {
 	local ns=""
 	local ns_name=""
-	local ns_list=""
+	local ns_list=()
 	local ns_exist=
 	for ns_name in "$@"; do
 		# Some test may setup/remove same netns multi times
@@ -177,13 +177,13 @@ setup_ns()
 
 		if ! ip netns add "$ns"; then
 			echo "Failed to create namespace $ns_name"
-			cleanup_ns "$ns_list"
+			cleanup_ns "${ns_list[@]}"
 			return $ksft_skip
 		fi
 		ip -n "$ns" link set lo up
-		! $ns_exist && ns_list="$ns_list $ns"
+		! $ns_exist && ns_list+=("$ns")
 	done
-	NS_LIST="$NS_LIST $ns_list"
+	NS_LIST+=("${ns_list[@]}")
 }
 
 tc_rule_stats_get()