Backup of postgres

hotbackup.sh

#!/bin/bash
#@****************************************************************************
#@ Author : Mathieu GOULIN ([email protected])
#@ Organization : Gadz.org (www.gadz.org)
#@ Licence : GNU/GPL
#@
#@ Description :
#@
#@ Prerequisites :
#@ Arguments :
#@
#@****************************************************************************
#@ History :
#@  - Mathieu GOULIN - 2015/12/26 : Initialisation du script
#@****************************************************************************

# Static configuration
cd `dirname $0`
script=`basename "$0" | cut -f1 -d"."`
log_file=`pwd`/$script.log

# Usage function
function usage () {
    # TODO - Write the good stuff here...
    echo "$0 [start|stop|restart]"
}
# Help function
function help () {
    usage
    echo
    grep -e "^#@" $script.sh | sed "s/^#@//"
}

# Log function
write_log () {
    log_state=$1
    shift;
    log_txt=$*
    log_date=`date +'%Y/%m/%d %H:%M:%S'`
    case ${log_state} in
        BEG)    chrtra="[START]"      ;;
        CFG)    chrtra="[CONF ERR]"   ;;
        ERR)    chrtra="[ERROR]"      ;;
        END)    chrtra="[END]"        ;;
        INF)    chrtra="[INFO]"       ;;
        *)      chrtra="[ - ]"        ;;
    esac
    echo "$log_date $chrtra : ${log_txt}" | tee -a ${log_file} 2>&1
}

test_rc () {
  if [ "x$1" != "x0" ]
  then
    echo $backup_sql_stop | psql -h /appli/postgres/${instancename}/run/ -v ON_ERROR_STOP=1 -p ${pg_port} -U postgres postgres
    write_log ERR "Erreur RC=$1"
    exit $1
  fi
}

. `dirname $0`/../config/config.sh

TH=`date +%Y%m%d%H%M%S`
backup_sql_start="SELECT pg_start_backup('${instancename}_backup_${TH}', true); SELECT pg_switch_xlog();"
backup_sql_stop="SELECT pg_stop_backup();"

echo $backup_sql_start | psql -h /appli/postgres/${instancename}/run/ -v ON_ERROR_STOP=1 -p ${pg_port} -U postgres postgres
test_rc $?

cd /appli/postgres/${instancename}/

tar -czvf data/backup_$instancename_$TH.tar.gz postgres-archivelog postgres-datafile --exclude="postgres-datafile/pg_xlog"
test_rc $?

echo $backup_sql_stop | psql -h /appli/postgres/${instancename}/run/ -v ON_ERROR_STOP=1 -p ${pg_port} -U postgres postgres
test_rc $?

cd /appli/postgres/${instancename}/data/
ls -tr | head -n $((`ls -tr | wc -l` - 5)) | xargs rm -rfv

exit 0