#!/bin/sh# SPDX-License-Identifier: GPL-2.0## Execute a subprocess in a network namespaceset-ereadonly NETNS="ns-$(mktemp-u XXXXXX)"setup(){ ip netns add "${NETNS}" ip -netns"${NETNS}"link set lo up}cleanup(){ ip netns del "${NETNS}"}trap cleanup EXITsetup"$@"exit"$?"