#!/bin/bash

DUMP_DIR="/var/backups/dumps/"

mkdir -p "$DUMP_DIR"
chmod go-rwx "$DUMP_DIR"

if [ -x /usr/bin/psql ]; then
    #
    su - postgres -c "pg_dumpall --roles-only " | bzip2 > $DUMP_DIR/roles-psql.sql.bz2

    #
    DATABASES=$(su - postgres -c "psql -t -c \"SELECT datname FROM pg_database AS dbs INNER JOIN pg_authid AS roles ON dbs.datdba=roles.oid WHERE rolname<>'postgres' ;\"")
    echo "Databases: $DATABASES"
    for DATABASE in $DATABASES ; do
        echo "Dumping database: $DATABASE"
        su - postgres -c "pg_dump $DATABASE" | bzip2 - > $DUMP_DIR/$DATABASE-psql.sql.bz2
    done
else
    echo "DMBS Postgresql not detected."
fi