Backup PostreSQL database from docker container

backup.sh

# /bin/bash

echo "Backup script is running"

PG_DOCKER_CONTAINER="postgres"
PG_USERNAME="postgres"
DATABASE="default_database"
HOMEPATH=$(cd ~ && pwd)

COLOR_NORMAL="\033[0m"
COLOR_GREEN="\033[0;32m"

echo "Database ${COLOR_GREEN}${DATABASE}${COLOR_NORMAL} will be backed up. Press ENTER or type new database name:"

read INPUT_DATABASE < "${1:-/dev/stdin}"

if (($(printf "%s" "$INPUT_DATABASE" | wc -c) > 0))
then
	DATABASE=$INPUT_DATABASE
	echo "Changing database to ${COLOR_GREEN}${DATABASE}${COLOR_NORMAL}"
fi

if [ "$(docker exec $PG_DOCKER_CONTAINER bash -c "psql -U $PG_USERNAME -tAc \"SELECT 1 FROM pg_database WHERE datname='$DATABASE'\"")" = '1' ]
then
	NAME="${DATABASE}_$(date +"%Y-%m-%d_%H-%M")"
	echo "Backup in progress"
else
	echo "No database $DATABASE found"
fi

docker exec $PG_DOCKER_CONTAINER bash -c "pg_dump -U $PG_USERNAME $DATABASE > /tmp/$NAME.sql" && \
docker cp $PG_DOCKER_CONTAINER:/tmp/$NAME.sql $HOMEPATH/ && \
tar czf $NAME.sql.tar.gz $NAME.sql && \
rm $NAME.sql && \
docker exec $PG_DOCKER_CONTAINER bash -c "rm /tmp/$NAME.sql"

echo "Backup placed at $HOMEPATH/$NAME.sql.tar.gz"