#!/bin/bash

# Configuration
# Le fichier sera nommé BASE_DIR/PREFIXEbasenameSUFFIXE
BASE_DIR="/var/backups/postgresql"
PREFIXE="sauv_pgsql"
SUFFIXE=_$( date +%Y%m%d-%H%M ).sql.gz
DUREE_DE_VIE=5

# Exit at first error
# note : check that you receive crontab's mails in case something goes wrong.
set -e
if [ -n "$BASH" ]; then
	# Bash required for this. If not available, return code will be 0
	# even if pg_dumpall fails (but usually it write something on stderr
	# so cron will send a mail nevertheless).
	set -o pipefail
fi

# Initial checks
if [ ! -d "$BASE_DIR" ]; then
	echo "ERREUR : répertoire de sauvegarde inexistant : $BASE_DIR ." >&2
	exit 1
fi

# Backup of the whole default cluster
su -l -c pg_dumpall postgres | gzip -c > "$BASE_DIR/$PREFIXE$SUFFIXE"


# Deletion of old backups
if [ "$1" = "--delete-olds" ]; then
	find $BASE_DIR -name "$PREFIXE*" -mtime +$DUREE_DE_VIE -print0 | xargs -n 200 -r -0 rm -f
fi