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#!/usr/bin/env bash
# Copyright © 2015-2016 Luke Shumaker <lukeshu@sbcglobal.net>
# This work is free. You can redistribute it and/or modify it under the
# terms of the Do What The Fuck You Want To Public License, Version 2,
# as published by Sam Hocevar. See the COPYING file for more details.
# Usage: network-online [start|stop] NETWORK_NAME
mode="$1"
lock=/run/network-online/lock
fifo=/run/network-online/"$2"
PS4="$mode: "
# Use a named pipe (fifo) as an inter-process synchronization
# mechanism; a call to block_{a,b} blocks until its counterpart is
# run.
block_a() {
cat "$fifo" >/dev/null
}
block_b() {
echo foo >> "$fifo"
}
# Because of restrictions put in place by systemd, the ExecStart
# process can't run `systemctl stop network-online.target`, but the
# ExecStop process can.
case "$mode" in
start)
trap 'rm -f -- "$fifo"' EXIT
set -x
mkdir -p /run/network-online || exit $?
exec 8>"$lock" || exit $?
flock -s 8 || exit $?
systemctl start network-online.target || exit $?
mkfifo "$fifo" || exit $?
block_a # wait for 'stop' to be called
exec 8>&-
block_a # signal to 'stop' that we've unlocked
;;
stop)
set -x
exec 8>"$lock" || exit $?
flock -s 8 || exit $?
block_b # signal 'start' to stop
block_b # wait for 'start' to unlock
if flock -x -n 8; then
systemctl stop network-online.target
rm -rf /run/network-online
fi
;;
esac
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