#!/bin/sh
#
# Copyright (c) 2017 Shawn Rose
#
# Author: Shawn Rose <shawnandrewrose@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

PREREQ=""

prereqs() {
    echo "$PREREQ"
}

case "$1" in
    prereqs)
        prereqs
        exit 0
    ;;
esac

[ -s /run/clevis.pid ] || exit 0

pid=$(cat /run/clevis.pid)
child_pids="$({ ps -o pid,ppid 2>/dev/null || ps -l ||
    { echo 'clevis: unable to get list of processes' >&2; exit 1; }; } |
    awk -v pid="$pid" '
        NR==1 {
            for (i=1; i<=NF; i++) if ($i == "PID") pid_col = i; else if ($i == "PPID") ppid_col = i
            if (!pid_col || !ppid_col) { print "clevis: unable to find PID and/or PPID columns in ps output" | "cat >&2"; exit 1 }
            next
        }
        { if ($ppid_col == pid) print $pid_col }')"

for kill_pid in $pid $child_pids; do
    kill "$kill_pid" 2>/dev/null
done

rm -f /run/clevis.pid

# Not really worried about downing extra interfaces: they will come up
# during the actual boot. Might make this configurable later if needed.

for iface in /sys/class/net/*; do
    if [ -e "$iface" ]; then
        iface=$(basename "$iface")
        ip link  set   dev "$iface" down
        ip addr  flush dev "$iface"
        ip route flush dev "$iface" > /dev/null 2>&1
    fi
done
