Modified init script to keep existing password if arg given and keep existing /data dir if non empty for persistence of database

init

#!/bin/sh
set -e
mkdir -p /usr/share/zoneinfo /data
chown default /data
if [ $# -eq 1 ]
then
    echo $1 > /pwfile
else
    head -c 16 /dev/urandom  | sha1sum | cut -c1-10 > /pwfile
fi
echo "PG_PASSWORD=$(cat /pwfile)"
if [ ! "$(ls -A /data)" ]; then
    #/data is empty
    su default -s /usr/bin/initdb -- --pgdata=/data --pwfile=/pwfile --username=postgres --auth=trust >/dev/null

fi
echo host all all 0.0.0.0 0.0.0.0 md5 >> /data/pg_hba.conf
exec su default -s /usr/bin/postgres -- -D /data -c 'listen_addresses=*'