#!/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.

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

cd $progdir/..
build=$PWD

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


for dir in /var/local /var/state /var/run /var/tmp; do
    [ -d $dir -a -w $dir ] && state=$dir/$program && break
done
[ "$state" ] || die "Couldn't find a directory to keep state in."
[ -d "$state" ] || mkdir $state
[ "$state" ] || die "Couldn't create state dir."


for dir in $DBLOCK /var/lock /var/state /var/run /var/tmp; do
    [ -d $dir -a -w $dir ] && lock=$dir/$program && break
done
[ "$lock" ] || die "Couldn't find a directory to keep lock in."


[ "$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
[ "$DBLOCK" ] || DBLOCK=$lock


PIDFILE=$DBLOCK/pid

while true; do
    if mkdir $DBLOCK; then
	chmod a+rwx $DBLOCK
	#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
	    chmod a+rw $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 $DBLOCK
	exit 0
    else
	pid=$(< $PIDFILE ) || die "Couldn't read pidfile '$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 $DBLOCK
	fi
    fi
done