#!/bin/sh

set -e

testdir=$(dirname "$(readlink -f "$0")")
. "$testdir/.env"

lower=$1
shift
[ $# -gt 0 ] || set sh

for pid in $(pgrep -fx "sleep infinity"); do
    ifidxs=$(nsenter -t $pid -U -n ip -j link show | \
    		 jq '.[] | select(has("link_netnsid")) | .link_index')
    for ifidx in $ifidxs; do
	ifname=$(ip -j link show | jq -r ".[] | select(.ifindex == $ifidx) | .ifname")
	if [ "$ifname" = "$lower" ]; then
	    exec nsenter -t $pid -U -n env PS1="$(build_ps1 "(netns:$ifname)")" "$@"
	fi
    done
done

echo Found no namespace with interface stacked on $lower >&2
exit 1