dex-init

#!/bin/dash

# Copyright (c) 2014 - 2016 Luigi Tarenga <luigi.tarenga@gmail.com>
# Distributed under the terms of a MIT license.

# parameters: [ lock_name  [ timeout  [ timeout2 ] ] ]

cd ${0%/*}

lname=${1:-default}
timeout=${2:-30}
timeout2=${3:-0}
hostname=$(hostname)
hostname=${hostname%%.*}

read lock_servers < conf/lock_servers
i=0; for h in $lock_servers ; do i=$((i+1)); done
majority=$((i/2+1))
echo $hostname $majority > temp/${lname}_params
echo $((timeout+timeout2))  > temp/${lname}_counter
echo "-invalid-" 0 0 "-invalid-" > temp/${lname}_htsp

if [ $i -eq 0 ] ; then
   echo "$(date) Error: you cannot use dex-lock without lock servers configured."
   exit 1
fi

if [ $i -eq 1 ] ; then
   echo "$(date) Warning: with one not fault tolerant lock server you introduce a single point of failure."
   exit 0
fi

if [ $((i%2)) -eq 0 ] ; then
   echo "$(date) Warning: an even number of lock servers can bear to a split brain event."
else
   echo "$(date) Lock initialization done."
fi