_docker

#!/usr/bin/env bash
#
# This script intentionally echoes the exact Docker commands it runs.
# Seeing the full command string helps keep the workflow transparent
# and avoids the "black box" feeling of wrapper scripts.

set -euo pipefail
IFS=$'\n\t'

# Enable BuildKit for faster and more efficient Docker builds.
# First run: docker buildx install
export DOCKER_BUILDKIT=1

if [[ ! -f ".env" ]]; then
  echo "Missing .env file. Copy .env-template and configure required values." >&2
  exit 1
fi

if ! command -v docker >/dev/null 2>&1; then
  echo "Docker command not found. Install Docker and try again." >&2
  exit 1
fi

highlight() {
  printf '\033[1;36m%s\033[0m\n' "$1"
}

# shellcheck disable=SC1091
source .env

required_vars=(DOCKER_IMAGE_NAME DOCKER_IMAGE_TAG TF_VAR_LAMBDA_RUNTIME TF_VAR_LAMBDA_ARCHITECTURE)
for var in "${required_vars[@]}"; do
  if [[ -z "${!var:-}" ]]; then
    echo "${var} must be set in .env" >&2
    exit 1
  fi
done

lambda_arch="${TF_VAR_LAMBDA_ARCHITECTURE}"
build_platform="linux/amd64"
if [[ "${lambda_arch}" == "arm64" ]]; then
  build_platform="linux/arm64"
fi

project_dir="$(pwd)"
build_cmd=(
  docker build
  --platform "${build_platform}"
  --build-arg "LAMBDA_RUNTIME=${TF_VAR_LAMBDA_RUNTIME}"
  --tag "${DOCKER_IMAGE_NAME}:${DOCKER_IMAGE_TAG}"
  --file docker/Dockerfile
  .
)
run_cmd=(
  docker run
  --rm
  --memory=4g
  --platform "${build_platform}"
  --volume "${project_dir}:/app"
  "${DOCKER_IMAGE_NAME}:${DOCKER_IMAGE_TAG}"
  /app/docker/build.sh
)

format_command() {
  printf '%q ' "$@"
  printf '\n'
}

echo "The .env file has been sourced. Do you wish to proceed with these docker commands:"
highlight "$(format_command "${build_cmd[@]}")"
echo ""
highlight "$(format_command "${run_cmd[@]}")"
echo

read -r -p "Continue? [y/N] " confirmation
case "${confirmation}" in
  [Yy]|[Yy][Ee][Ss]) ;;
  *) echo "Aborted."; exit 0 ;;
esac

highlight "Executing: $(format_command "${build_cmd[@]}")"
"${build_cmd[@]}"

highlight "Executing: $(format_command "${run_cmd[@]}")"
"${run_cmd[@]}"

if [[ -f "lambda.zip" ]]; then
  rm lambda.zip
fi

if [[ ! -f "lambda-deployment.zip" ]]; then
  echo "Expected lambda-deployment.zip was not generated." >&2
  exit 1
fi

mv lambda-deployment.zip lambda.zip
echo "Lambda package created at lambda.zip"