[PATCH net-next v4 02/10] selftests: net: add helpers for running a command on other targets

Ioana Ciornei
2026-03-26T13:28:48Z

Add a couple of helpers which can be used by tests which need to run a
specific bash command on a different target than the local system, be it
either another netns or a remote system accessible through ssh.

The __run_on() function is passed through $1 the target on which the
command should be executed while run_on() is passed the name of the
interface that is then used to retrieve the target from the TARGETS
array.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
---
Changes in v4:
- reworked the helpers so that no global variable is used and
information is passed only through parameters
Changes in v3:
- s/TARGET/CUR_TARGET
- always fallback on running a command locally when either TARGETS is
not declared or there is no entry for a specific interface
Changes in v2:
- patch is new

tools/testing/selftests/net/lib.sh | 38 ++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)

diff --git a/tools/testing/selftests/net/lib.sh b/tools/testing/selftests/net/lib.sh
index b40694573f4c..6c0d613a4de5 100644
--- a/tools/testing/selftests/net/lib.sh
+++ b/tools/testing/selftests/net/lib.sh
@@ -670,3 +670,41 @@ cmd_jq()
# return success only in case of non-empty output
[ ! -z "$output" ]
}
+
+__run_on()
+{
+ local target=$1; shift
+ local type args
+
+ IFS=':' read -r type args <<< "$target"
+
+ case "$type" in
+ netns)
+ # Execute command in network namespace
+ # args contains the namespace name
+ ip netns exec "$args" "$@"
+ ;;
+ ssh)
+ # Execute command via SSH args contains user@host
+ ssh -n "$args" "$@"
+ ;;
+ local|*)
+ # Execute command locally. This is also the fallback
+ # case for when the interface's target is not found in
+ # the TARGETS array.
+ "$@"
+ ;;
+ esac
+}
+
+run_on()
+{
+ local iface=$1; shift
+ local target="local:"
+
+ if declare -p TARGETS &>/dev/null; then
+ target="${TARGETS[$iface]}"
+ fi
+
+ __run_on "$target" "$@"
+}
--
2.25.1