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#!/bin/bash

# PostgreSQL startup script for Slackware Linux
# Copyright 2007 Adis Nezirovic <adis _at_ linux.org.ba>
# Licensed under GNU GPL v2

# Do not source this script (since it contains exit() calls)

# Before you can run postgresql you'll need to create the
# database files in /var/lib/pgsql. The following should do
# the trick.
#
#   $ su postgres -c "initdb -D /var/lib/pgsql/data"
#

LOGFILE=/var/log/postgresql
DATADIR=/var/lib/pgsql/data
POSTGRES=/usr/bin/postgres
PIDFILE=postmaster.pid

# Return values (according to LSB):
# 0 - success
# 1 - generic or unspecified error
# 2 - invalid or excess argument(s)
# 3 - unimplemented feature (e.g. "reload")
# 4 - insufficient privilege
# 5 - program is not installed
# 6 - program is not configured
# 7 - program is not running

pg_ctl()
{
	CMD="/usr/bin/pg_ctl $@"
	su - postgres -c "$CMD"
}

if [ ! -f $POSTGRES ]; then
	echo "Could not find 'postgres' binary. Maybe PostgreSQL is not installed properly?"
	exit 5
fi

case "$1" in

	"start")
		echo "Starting PostgreSQL"
		touch $LOGFILE
		chown postgres:wheel $LOGFILE
		chmod 0640 $LOGFILE
	
		if [ ! -e $DATADIR/PG_VERSION ]; then
			echo "You should initialize the PostgreSQL database at location $DATADIR"
			exit 6
		fi
	
		if [ `pgrep -f $POSTGRES` ]; then

			echo "PostgreSQL daemon already running"
			if [ ! -f $DATADIR/$PIDFILE ]; then
				echo "Warning: Missing pid file $DATADIR/$PIDFILE"
			fi
			exit 1

		else # remove old socket, if it exists and no daemon is running.

			if [ ! -f $DATADIR/$PIDFILE ]; then
				rm -f /tmp/.s.PGSQL.5432
				rm -f /tmp/.s.PGSQL.5432.lock
				pg_ctl start -w -l $LOGFILE -D $DATADIR
				exit 0
			else
				echo "PostgreSQL daemon was not properly shut down"
				echo "Please remove stale pid file $DATADIR/$PIDFILE"
				exit 7
			fi

		fi	
	;;

	"stop")
		echo "Shutting down PostgreSQL..."
		pg_ctl stop -l $LOGFILE -D $DATADIR -m smart
	;;

	"restart")
		echo "Restarting PostgreSQL..."
		pg_ctl restart -l $LOGFILE -D $DATADIR -m smart
	;;

	"reload")
		echo "Reloading configuration for PostgreSQL..."
		pg_ctl reload -l $LOGFILE -D $DATADIR -m smart
	;;

	"status")
		if [ `pgrep -f $POSTGRES` ]; then
			echo "PostgreSQL is running"

			if [ ! -e $DATADIR/$PIDFILE ]; then
				echo "Warning: Missing pid file $DATADIR/$PIDFILE"
			fi

			exit 0
		else
			echo "PostgreSQL is stopped"

			if [ -e $DATADIR/$PIDFILE ]; then
				echo "Detected stale pid file $DATADIR/$PIDFILE"
			fi

			exit 0
		fi
	;;

	*)
		echo "Usage: $0 {start|stop|status|restart|reload}"
		exit 1
	;;
esac