#!/bin/bash

[ $# -ne 5 ] && exit 6

PGDUMP=`which pg_dumpall`
BACKUP_DIR=${1}
USE_SU=${2}
USER=${3}
HOST=${4}
DB_NAME=${5}

PG_OPTS1=
PG_OPTS2=
[ -n "${USER}" ] && PG_OPTS1="-U ${USER}"
[ -n "${HOST}" ] && PG_OPTS2="-h ${HOST}"

[ ! -e "${BACKUP_DIR}/${DB_NAME}" ] && mkdir -p "${BACKUP_DIR}/${DB_NAME}"
chown -R postgres:root "${BACKUP_DIR}"
chmod 750 -R "${BACKUP_DIR}"
find "${BACKUP_DIR}" -type f -exec chmod 640 {} \;

if [ "${USE_SU}" == "no" ]; then
    $PGDUMP ${PG_OPTS1} ${PG_OPTS2} -f "${BACKUP_DIR}/${DB_NAME}/${DB_NAME}.sql"
    ret=$?
    else
    su postgres -c "$PGDUMP ${PG_OPTS1} ${PG_OPTS2} -f \"${BACKUP_DIR}/${DB_NAME}/${DB_NAME}.sql\""
    ret=$?
    fi

if [ ${ret} -eq 0 ]; then
        FNAME="${BACKUP_DIR}-${DB_NAME}.tgz"
        tar c -z -f $FNAME "${BACKUP_DIR}/${DB_NAME}/${DB_NAME}.sql" >/dev/null 2>&1
        ret=$?
        fi

rm -rf "${BACKUP_DIR}"

exit ${ret}