zero-to-production/scripts/init_db.sh

#!/usr/bin/env bash
set -x
set -eo pipefail

# Check if a custom user has been set, otherwise default to 'postgres'
DB_USER=${POSTGRES_USER:=postgres}
# Check if a custom password has been set, otherwise default to 'password'
DB_PASSWORD="${POSTGRES_PASSWORD:=password}"
# Check if a custom password has been set, otherwise default to 'newsletter'
DB_NAME="${POSTGRES_DB:=newsletter}"
# Check if a custom port has been set, otherwise default to '5432'
DB_PORT="${POSTGRES_PORT:=5432}"

# Allow to skip Docker if a dockerized Postgres database is already running
if [[ -z "${SKIP_DOCKER}" ]]
then
  # Launch postgres using Docker
  docker run \
      -e POSTGRES_USER=${DB_USER} \
      -e POSTGRES_PASSWORD=${DB_PASSWORD} \
      -e POSTGRES_DB=${DB_NAME} \
      -p "${DB_PORT}":5432 \
      -d postgres \
      postgres -N 1000
      # ^ Increased maximum number of connections for testing purposes
fi

# Keep pinging Postgres until it's ready to accept commands
until PGPASSWORD="${DB_PASSWORD}" psql -h "localhost" -U "${DB_USER}" -p "${DB_PORT}" -d "postgres" -c '\q'; do
  >&2 echo "Postgres is still unavailable - sleeping"
  sleep 1
done

>&2 echo "Postgres is up and running on port ${DB_PORT} - running migrations now!"

export DATABASE_URL=postgres://${DB_USER}:${DB_PASSWORD}@localhost:${DB_PORT}/${DB_NAME}
sqlx database create
sqlx migrate run

>&2 echo "Postgres has been migrated, ready to go!"