#!/bin/bash

# push in a new copy of the database from a dump of the master database, and
# do the fixups needed to run the django apps.

#set -x

program=${0##*/}
progdir=${0%/*}

cd $progdir/..
build=$PWD
state=/var/local/$program

function log() { logger -i -t $program -s "$*"; }
function die() { log "$*; terminating."; echo "$program: Error: $*" 1>&2; exit 1; }


[ $DBDUMP ] || DBDUMP="$1"
[ $DBDUMP ] || DBDUMP=/www/tools.ietf.org/events/raw/sqldump/sqldump.raw
[ $DBFIX  ] || DBFIX=$build/test/sql_fixup.sql
[ $DBTIME ] || DBTIME=$state/update-db.time
[ $DBDONE ] || DBDONE=$state/update-db.done

LOCKDIR=/var/lock/ietfdb
PIDFILE=$LOCKDIR/pid

while true; do
    if mkdir $LOCKDIR; then
	echo ""
	#date +"Time: %Y-%m-%d %H:%M"
	#echo "Database dump file is from $(date -r $DBDUMP +'%Y-%m-%d %H:%M')."
	#echo "Last update done $(date -r $DBDONE +'%Y-%m-%d %H:%M')."
	if [ $DBDUMP -nt $DBTIME ]; then
	    echo "$$" > $PIDFILE
	    log "Updating local database from $DBDUMP ..."
	    python ietf/manage.py dbshell <  $DBDUMP
	    log "Updating local database from $DBFIX ..."
	    python ietf/manage.py dbshell <  $DBFIX
	    log "Running Django syncdb ..."
	    python ietf/manage.py syncdb
	    touch -r $DBDUMP $DBTIME
	    touch $DBDONE
	    log "Done."
	else
	    #echo "No new database dump available."
	fi
	rm -rf $LOCKDIR
	exit 0
    else
	pid=$(< $PIDFILE ) || die "Couldn't read pidfile '$PIDFILE'"
	if kill -0 $pid; then
	    log "Pidfile for process $pid exists, and process is running. Sleeping."
	    sleep 10
	else
	    log "Pidfile for process $pid exists, but process isn't running."
	    log "Removing lock and old pid file $pidfile."
	    rm -rf $LOCKDIR
	fi
    fi
done