#!/bin/bash
usage() {                                 # Function: Print a help message.
  echo "Image Build Script: Creates one or more images using a target in the docker-bake.hcl file"
  echo "USAGE: $0 <setup options> buildtarget <imagename, imageuser>"
  echo "valid targets: ${targets[*]};  default: dev"
  echo no argument options:
  echo "-c try out the image by starting a container terminal therein, for dev target this is the default;"
  echo "-x exclude distro from image name;"
  echo "-n for --no_cache"
  echo "-p push to repository; after build push to repository default is hub.docker.common (not need for deploy target)"
  echo required argument options:
  echo "-d <LINUX_DISTRO> supported: alpine, debian, ubuntu, default: alpine; if base image set distro will be determined"
  echo "-t <TAG> tag following : in output image name (i.e.  REPO/USER/NAME:TAG), default: latest"
  echo "-u <USER>;  repository user prefix in output image name (i.e.  REPO/USER/NAME:TAG)"
  echo "-r <REPO>;  private repo name, do not use for hub.docker.com (docker.io)"
  echo "-b <BASE_IMAGE>;  used in FROM in Dockerfile, default is official distro image (e.g. alpine:latest)"
  echo "-w <SCRIPTS>;  set a custom WORKDIR in Dockerfile, default is /opt/build"
}