ip_netns

#!/bin/sh

[ $# -eq 2 ] || exec echo "usage: $0 <pid> <name>"

pid=$1
name=$2

if ! grep -q /netns /proc/mounts; then
    ip netns add tmp$$
    ip netns del tmp$$
fi

if ! [ -d "/proc/$pid" ]; then
    echo "PID $pid doesn't exist"
    exit 1
fi

>"/run/netns/$name"
mount --bind "/proc/$pid/ns/net" "/run/netns/$name"