#!/bin/sh
#
# postgresql	This is the init script for starting up the PostgreSQL
#		server.
#
# This script is slightly unusual in that the name of the daemon (postmaster)
# is not the same as the name of the subsystem (postgresql)
#
# chkconfig: - 64 36
# description: PostgreSQL database server.
# processname: postmaster
# pidfile: /var/run/postmaster.PORT.pid
### BEGIN INIT INFO
# Provides: postgresql
# Required-Start: $local_fs $remote_fs $network $named $syslog $time
# Required-Stop: $local_fs $remote_fs $network $named $syslog $time
# Short-Description: start and stop PostgreSQL server
# Description: PostgreSQL database server
### END INIT INFO

# PGVERSION is the full package version, e.g., 9.0.2
# Note: the specfile inserts the correct value during package build
PGVERSION=xxxx
# PGMAJORVERSION is major version, e.g., 9.0 (this should match PG_VERSION)
PGMAJORVERSION=`echo "$PGVERSION" | sed 's/^\([0-9]*\.[0-9]*\).*$/\1/'`
# PREVMAJORVERSION is the previous major version, e.g., 8.4, for upgrades
# Note: the specfile inserts the correct value during package build
PREVMAJORVERSION=xxxx
# PREVPGENGINE is the directory containing the previous postmaster executable
# Note: the specfile inserts the correct value during package build
PREVPGENGINE=xxxx
# PGDOCDIR is the directory containing the package's documentation
# Note: the specfile inserts the correct value during package build
PGDOCDIR=xxxx

# Source function library.
. /etc/rc.d/init.d/functions

# Get network config.
. /etc/sysconfig/network

# Find the name of the script
NAME=`basename $0`
if [ ${NAME:0:1} = "S" -o ${NAME:0:1} = "K" ]
then
	NAME=${NAME:3}
fi

# For SELinux we need to use 'runuser' not 'su'
if [ -x /sbin/runuser ]
then
    SU=runuser
else
    SU=su
fi


# Set defaults for configuration variables
PGENGINE=/usr/bin
PGPORT=5432
PGDATA=/var/lib/pgsql/data
PGLOG=/var/lib/pgsql/pgstartup.log
# Value to set as postmaster process's oom_adj
PG_OOM_ADJ=-17

# Override defaults from /etc/sysconfig/pgsql if file is present
[ -f /etc/sysconfig/pgsql/${NAME} ] && . /etc/sysconfig/pgsql/${NAME}

export PGDATA
export PGPORT

lockfile="/var/lock/subsys/${NAME}"
pidfile="/var/run/postmaster.${PGPORT}.pid"

script_result=0

start(){
	[ -x "$PGENGINE/postmaster" ] || exit 5

	PSQL_START=$"Starting ${NAME} service: "

	# Make sure startup-time log file is valid
	if [ ! -e "$PGLOG" -a ! -h "$PGLOG" ]
	then
		touch "$PGLOG" || exit 4
		chown postgres:postgres "$PGLOG"
		chmod go-rwx "$PGLOG"
		[ -x /sbin/restorecon ] && /sbin/restorecon "$PGLOG"
	fi

	# Check for the PGDATA structure
	if [ -f "$PGDATA/PG_VERSION" ] && [ -d "$PGDATA/base" ]
	then
		# Check version of existing PGDATA
		if [ x`cat "$PGDATA/PG_VERSION"` = x"$PGMAJORVERSION" ]
		then
			: A-OK
		elif [ x`cat "$PGDATA/PG_VERSION"` = x"$PREVMAJORVERSION" ]
		then
			echo
			echo $"An old version of the database format was found."
			echo $"Use \"service postgresql upgrade\" to upgrade to version $PGMAJORVERSION."
			echo $"See $PGDOCDIR/README.rpm-dist for more information."
			exit 1
		else
			echo
			echo $"An old version of the database format was found."
			echo $"You need to dump and reload before using PostgreSQL $PGMAJORVERSION."
			echo $"See $PGDOCDIR/README.rpm-dist for more information."
			exit 1
		fi
	else
		# No existing PGDATA! Warn the user to initdb it.
		echo
                echo $"$PGDATA is missing. Use \"service postgresql initdb\" to initialize the cluster first."
		echo_failure
		echo
		exit 1
 	fi

	echo -n "$PSQL_START"
	test x"$PG_OOM_ADJ" != x && echo "$PG_OOM_ADJ" > /proc/self/oom_adj
	$SU -l postgres -c "$PGENGINE/postmaster -p '$PGPORT' -D '$PGDATA' ${PGOPTS} &" >> "$PGLOG" 2>&1 < /dev/null
	sleep 2
	pid=`head -n 1 "$PGDATA/postmaster.pid" 2>/dev/null`
	if [ "x$pid" != x ]
	then
		success "$PSQL_START"
		touch "$lockfile"
		echo $pid > "$pidfile"
		echo
	else
		failure "$PSQL_START"
		echo
		script_result=1
	fi
}

stop(){
	echo -n $"Stopping ${NAME} service: "
	if [ -e "$lockfile" ]
	then
	    $SU -l postgres -c "$PGENGINE/pg_ctl stop -D '$PGDATA' -s -m fast" > /dev/null 2>&1 < /dev/null
	    ret=$? 
	    if [ $ret -eq 0 ]
	    then
		echo_success
		rm -f "$pidfile"
		rm -f "$lockfile"
	    else
		echo_failure
		script_result=1
	    fi
	else
	    # not running; per LSB standards this is "ok"
	    echo_success
	fi
	echo
}

restart(){
    stop
    start
}

condrestart(){
    [ -e "$lockfile" ] && restart || :
}

reload(){
    $SU -l postgres -c "$PGENGINE/pg_ctl reload -D '$PGDATA' -s" > /dev/null 2>&1 < /dev/null
}

# code shared between initdb and upgrade actions
perform_initdb(){
	if [ ! -e "$PGDATA" -a ! -h "$PGDATA" ]
	then
		mkdir -p "$PGDATA" || return 1
		chown postgres:postgres "$PGDATA"
		chmod go-rwx "$PGDATA"
	fi
	# Clean up SELinux tagging for PGDATA
	[ -x /sbin/restorecon ] && /sbin/restorecon "$PGDATA"

	# Make sure the startup-time log file is OK, too
	if [ ! -e "$PGLOG" -a ! -h "$PGLOG" ]
	then
		touch "$PGLOG" || return 1
		chown postgres:postgres "$PGLOG"
		chmod go-rwx "$PGLOG"
		[ -x /sbin/restorecon ] && /sbin/restorecon "$PGLOG"
	fi

	# Initialize the database
	$SU -l postgres -c "$PGENGINE/initdb --pgdata='$PGDATA' --auth='ident'" >> "$PGLOG" 2>&1 < /dev/null

	# Create directory for postmaster log
	mkdir "$PGDATA/pg_log"
	chown postgres:postgres "$PGDATA/pg_log"
	chmod go-rwx "$PGDATA/pg_log"

	if [ -f "$PGDATA/PG_VERSION" ]
	then
	    return 0
	fi
	return 1
}

initdb(){
    if [ -f "$PGDATA/PG_VERSION" ]
    then
	echo -n $"Data directory is not empty!"
	echo_failure
	echo
	script_result=1
    else
	echo -n $"Initializing database: "
	if perform_initdb
	then
	    echo_success
	else
	    echo_failure
	    script_result=1
	fi
	echo
    fi
}

upgrade(){
    # must see previous version in PG_VERSION
    if [ ! -f "$PGDATA/PG_VERSION" -o \
	 x`cat "$PGDATA/PG_VERSION"` != x"$PREVMAJORVERSION" ]
    then
	echo
	echo $"Cannot upgrade because database is not of version $PREVMAJORVERSION."
	echo_failure
	echo
	exit 1
    fi
    if [ ! -x "$PGENGINE/pg_upgrade" ]
    then
	echo
	echo $"Please install the postgresql-upgrade RPM."
	echo_failure
	echo
	exit 5
    fi
    # Make sure service is stopped
    stop

    echo -n $"Upgrading database: "

    # Set up log file for pg_upgrade
    PGUPLOG=/var/lib/pgsql/pgupgrade.log
    rm -f "$PGUPLOG"
    touch "$PGUPLOG" || exit 1
    chown postgres:postgres "$PGUPLOG"
    chmod go-rwx "$PGUPLOG"
    [ -x /sbin/restorecon ] && /sbin/restorecon "$PGUPLOG"

    # Move old DB to PGDATAOLD
    PGDATAOLD="${PGDATA}-old"
    rm -rf "$PGDATAOLD"
    mv "$PGDATA" "$PGDATAOLD" || exit 1

    # Create empty new-format database
    if perform_initdb
    then
	# Do the upgrade
	$SU -l postgres -c "$PGENGINE/pg_upgrade \
		'--old-bindir=$PREVPGENGINE' \
		'--new-bindir=$PGENGINE' \
		'--old-datadir=$PGDATAOLD' \
		'--new-datadir=$PGDATA' \
		--link \
		'--old-port=$PGPORT' '--new-port=$PGPORT' \
		--user=postgres" >> "$PGUPLOG" 2>&1 < /dev/null
	if [ $? -ne 0 ]
	then
	    # pg_upgrade failed
	    script_result=1
	fi
    else
	# initdb failed
	script_result=1
    fi

    if [ $script_result -eq 0 ]
    then
	    echo_success
    else
	    # Clean up after failure
	    rm -rf "$PGDATA"
	    mv "$PGDATAOLD" "$PGDATA"

	    echo_failure
    fi
    echo
    echo $"See $PGUPLOG for details."
}

# See how we were called.
case "$1" in
  start)
	start
	;;
  stop)
	stop
	;;
  status)
	status -p "$pidfile" postmaster
	script_result=$?
	;;
  restart)
	restart
	;;
  condrestart|try-restart)
	condrestart
	;;
  reload)
	reload
	;;
  force-reload)
	restart
	;;
  initdb)
	initdb
	;;
  upgrade)
	upgrade
	;;
  *)
	echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload|initdb|upgrade}"
	exit 2
esac

exit $script_result