#!/bin/sh
#
# postgresql    This is the init script for starting up the PostgreSQL
#               server.
#
# chkconfig: - 64 36
# description: PostgreSQL database server.
# processname: postmaster
# pidfile="/var/run/${NAME}.pid"

# This script is slightly unusual in that the name of the daemon (postmaster)
# is not the same as the name of the subsystem (postgresql)

# Version 9.0 Devrim Gunduz <devrim@gunduz.org>
# Get rid of duplicate PGDATA assignment.
# Ensure pgstartup.log gets the right ownership/permissions during initdb

# Version 9.1 Devrim Gunduz <devrim@gunduz.org>
# Update for 9.1
# Add an option to initdb to specify locale (default is $LANG):
# service postgresql initdb tr_TR.UTF-8

# Version 9.2 Devrim Gunduz <devrim@gunduz.org>
# Update for 9.2

# Version 9.2.1 Devrim Gunduz <devrim@gunduz.org>
# Fix version number in initdb warning message, per Jose Pedro Oliveira.
# Add new functionality: Upgrade from previous version.
# Usage: service postgresql-9.2 upgrade

# Version 9.2.3 Devrim Gunduz <devrim@gunduz.org>
# Fix longstanding bug: Enable pidfile and lockfile variables to be defined
# in sysconfig file.
# Use $pidfile in status().

# Version 9.2.4 Devrim Gunduz <devrim@gunduz.org>
# Fix pid file name in init script, so that it is more suitable for
# multiple postmasters. Per suggestion from Andrew Dunstan. Fixes #92.

# Version 9.3.0 Devrim Gunduz <devrim@gunduz.org>
# Add support for pg_ctl promote. Per suggestion from Magnus Hagander. Fixes #93.
# Remove hardcoded script names in init script. Fixes #102.

# Version 9.3.1 Devrim Gunduz <devrim@gunduz.org>
# Fix PGPREVMAJORVERSION parameter, per report from Igor Poteryaev.
# Remove extra whitespace in upgrade() code, per report from Igor Poteryaev.

# Version 9.3.2 Devrim Gunduz <devrim@gunduz.org>
# Add process name to the status() call. Patch from Darrin Smart

# Version 9.4.0 Devrim Gunduz <devrim@gunduz.org>
# Remove PGPORT variable.

# PGVERSION is the full package version, e.g., 9.4.0
# Note: the specfile inserts the correct value during package build
PGVERSION=9.4.11
# PGMAJORVERSION is major version, e.g., 9.4 (this should match PG_VERSION)
PGMAJORVERSION=`echo "$PGVERSION" | sed 's/^\([0-9]*\.[0-9]*\).*$/\1/'`
PGPREVMAJORVERSION=9.3

# Source function library.
INITD=/etc/rc.d/init.d
. $INITD/functions

# Get function listing for cross-distribution logic.
TYPESET=`typeset -f|grep "declare"`

# 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

# Define variable for locale parameter:
LOCALEPARAMETER=$2

# Set defaults for configuration variables
PGENGINE=/usr/pgsql-9.4/bin
PGDATA=/var/lib/pgsql/9.4/data
PGLOG=/var/lib/pgsql/9.4/pgstartup.log
# Log file for pg_upgrade
PGUPLOG=/var/lib/pgsql/$PGMAJORVERSION/pgupgrade.log

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

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

export PGDATA

[ -f "$PGENGINE/postmaster" ] || exit 1

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 "$PGLOG" || exit 1
		chown postgres:postgres "$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
			SYSDOCDIR="(Your System's documentation directory)"
			if [ -d "/usr/doc/postgresql-$PGVERSION" ]
			then
				SYSDOCDIR=/usr/doc
			fi
			if [ -d "/usr/share/doc/postgresql-$PGVERSION" ]
			then
				SYSDOCDIR=/usr/share/doc
			fi
			if [ -d "/usr/doc/packages/postgresql-$PGVERSION" ]
			then
				SYSDOCDIR=/usr/doc/packages
			fi
			if [ -d "/usr/share/doc/packages/postgresql-$PGVERSION" ]
			then
				SYSDOCDIR=/usr/share/doc/packages
			fi
			echo
			echo $"An old version of the database format was found."
			echo $"You need to upgrade the data format before using PostgreSQL."
			echo $"See $SYSDOCDIR/postgresql-$PGVERSION/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 $NAME initdb\" to initialize the cluster first."
		echo_failure
		echo
		exit 1
 	fi

	echo -n "$PSQL_START"
	$SU -l postgres -c "$PGENGINE/postmaster -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
}

initdb(){
			# If the locale name is specified just after the initdb parameter, use it:
			if [ -z $LOCALEPARAMETER ]
			then
				LOCALE=`echo $LANG`
			else
				LOCALE=`echo $LOCALEPARAMETER`
			fi
				LOCALESTRING="--locale=$LOCALE"

		if [ -f "$PGDATA/PG_VERSION" ]
		then
			echo "Data directory is not empty!"
			echo_failure
		else
			echo -n $"Initializing database: "
			if [ ! -e "$PGDATA" -a ! -h "$PGDATA" ]
			then
				mkdir -p "$PGDATA" || exit 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 "$PGLOG" || exit 1
				chown postgres:postgres "$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' $LOCALESTRING" >> "$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"

			[ -f "$PGDATA/PG_VERSION" ] && echo_success
			[ ! -f "$PGDATA/PG_VERSION" ] && echo_failure
			echo
		fi
}

upgrade(){

# The second parameter is the new database version, i.e. $PGMAJORVERSION in this case.
# Use  "postgresql-$PGMAJORVERSION" service, if not specified.
INIT_SCRIPT="$2"
if [ x"$INIT_SCRIPT" = x ]
then
    INIT_SCRIPT=postgresql-$PGMAJORVERSION
fi

# The third parameter is the old database version, i.e. $PGPREVMAJORVERSION in this case.
# Use  "postgresql-$PGPREVMAJORVERSION" service, if not specified.
OLD_INIT_SCRIPT="$3"
if [ x"$OLD_INIT_SCRIPT" = x ]
then
    OLD_INIT_SCRIPT=postgresql-$PGPREVMAJORVERSION
fi

# Find the init script of the new version:
if [ ! -f "/etc/init.d/${INIT_SCRIPT}" ]
then
 	echo "Could not find init script /etc/init.d/${INIT_SCRIPT}"
fi

# Find the init script of the old version
if [ ! -f "/etc/init.d/${OLD_INIT_SCRIPT}" ]
then
	echo "Could not find init script /etc/init.d/${OLD_INIT_SCRIPT}"
	echo "Please install postgresql91-server RPM first."
	exit
fi

# Get port number and data directory of the old instance from the init script
OLDPGDATA=` sed -n 's/^PGDATA=//p' /etc/init.d/postgresql-$PGPREVMAJORVERSION`
OLDPGPORT=`sed -n 's/^PGPORT=//p' /etc/init.d/postgresql-$PGPREVMAJORVERSION`

# Get port number and data directory of the new instance from the init script
NEWPGDATA=` sed -n 's/^PGDATA=//p' /etc/init.d/postgresql-$PGMAJORVERSION`
NEWPGPORT=`sed -n 's/^PGPORT=//p' /etc/init.d/postgresql-$PGMAJORVERSION`

if [ ! -x "$PGENGINE/pg_upgrade" ]
    then
	echo
	echo $"Please install the postgresql92-contrib RPM for pg_upgrade command."
	echo
        exit 5
fi

# Perform initdb on the new server
/sbin/service $NAME initdb
RETVAL=$?
if [ $RETVAL -ne 0 ]
  then
	echo "initdb failed!"
	exit 1
fi

# Check the clusters first, without changing any data:
su -l postgres -c "$PGENGINE/pg_upgrade -b /usr/pgsql-$PGPREVMAJORVERSION/bin/ -B $PGENGINE/ -d $OLDPGDATA -D $NEWPGDATA -p $OLDPGPORT -P $NEWPGPORT -c"
RETVAL=$?
if [ $RETVAL -eq 0 ]
  then
	echo "Clusters checked successfully, proceeding with upgrade from $PGPREVMAJORVERSION to $PGMAJORVERSION"
	echo "Stopping old cluster"
	/sbin/service $OLD_INIT_SCRIPT stop

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

	echo "Performing upgrade"
	su -l postgres -c "$PGENGINE/pg_upgrade \
		-b /usr/pgsql-$PGPREVMAJORVERSION/bin/ -B $PGENGINE/ \
		-d $OLDPGDATA -D $NEWPGDATA \
		-p $OLDPGPORT -P $NEWPGPORT" >> "$PGUPLOG" 2>&1 < /dev/null
  else
	echo "Cluster check failed. Please see the output above."
	exit 1
fi
	echo

exit 0
}


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

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

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

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

exit $script_result