#!/bin/bash

##################################################
# Docker                                         #
# - --privileged                                 #
# - --net host                                   #
# Mount dir                                      #
# - /etc/keepalived/                             #
# - LOG_DIR                                      #
##################################################

set -euo pipefail
export LANG=en_US.UTF-8
trap Quit EXIT

PIDS=
GOT_SIGTERM=
LOG_DIR='/var/log/keepalived'

function Print {
    local file=/dev/null
    [ '-f' = "$1" ] && file=$2 && shift && shift
    date +"[%F %T] $*" | tee -a $file
}

function Quit {
    Print killing keepalived ...
    while :; do
        pkill -f keepalived && Print killing keepalived ... || break
        sleep 1
    done
    Print Container stopped.
    test -n "$GOT_SIGTERM"
}

function StartProc {
    Print Starting keeplived ...
    rm -rf /var/run/keepalived
    keepalived -f /etc/keepalived/keepalived.conf -lDGn &>> $LOG_DIR/keepalived.log &
    PIDS="$PIDS $!"
    Print Keeplived started.
}

function Main {
    local pid=
    StartProc
    trap "GOT_SIGTERM=1; Print Got SIGTERM ..." SIGTERM
    while [ -z "$GOT_SIGTERM" ] && sleep 2; do
        for pid in $PIDS; do
            [ ! -e /proc/$pid ] && Print Unexpected error! && exit
        done
    done
}

# Start here
Main