#!/bin/bash

DATE=$(date +%F)
DIRBACKUP="/data/backups"
DBUSER="postgres"

getDbName() {
    docker exec postgresql bash -c "psql -lA -x -U postgres -p 5432 -d postgres | \
                                    grep Name | grep -v -P 'template0|template1' | cut -f 2  -d '|'"
}

DBLIST=$(getDbName)

createBackup() {
    for db in $DBLIST; do
        echo "===================================="
        echo "START create backup database: ${db}"

        docker exec postgresql bash -c "pg_dump -Fc -U ${DBUSER} -p 5432 -d ${db}" > "${DIRBACKUP}/${db}-${DATE}".sql
        
        bzip2 -9 "${DIRBACKUP}/${db}-${DATE}".sql

        echo "END database bzip2: ${db}"
    done
}

[[ $(ls -A ${DIRBACKUP}) ]] 2>/dev/null && echo "dir ${DIRBACKUP} not empty" && exit 123

createBackup