#!/usr/bin/env ruby
# Configure like so:
# dockerfile: |-
#   RUN apk add --no-cache build-base git
#   RUN gem install gem_hadar bundler
# 
# script: &script |-
#   ruby -v
#   rake test
# 
# images:
#   ruby:3.0-alpine: *script
#   ruby:2.7-alpine: *script
#   ruby:2.6-alpine: *script
#   ruby:2.5-alpine: *script
#   ruby:2.4-alpine: *script
#   ruby:2.3-alpine: *script

require 'yaml'
require 'tmpdir'
require 'fileutils'
include FileUtils

alias sh system

def provide_image(image, dockerfile)
  tag = "all_images/#{image}"
  sh "docker pull '#{image}'"
  build_dir = File.join(Dir.tmpdir, 'build')
  mkdir_p build_dir
  cd build_dir do
    File.open('Dockerfile', 'w') do |t|
      t.puts <<~end
        FROM #{image}

        WORKDIR /work

        #{dockerfile}
      end
    end
    sh "docker build -t '#{tag}' ."
  end
  tag
ensure
  rm_rf File.join(Dir.tmpdir, 'build')
end

def red(string)
  "\e[31m#{string}\e[0m"
end

def green(string)
  "\e[32m#{string}\e[0m"
end

config = YAML.load_file(ARGV.shift || '.all_images.yml')
dockerfile = config['dockerfile'].to_s
Array(config['images']).each do |image, script|
  tag = provide_image image, dockerfile
  if sh "docker run --name all_images -v `pwd`:/work '#{tag}' sh -c '#{script}'"
    puts green('SUCCESS')
  else
    puts red('FAILURE')
  end
ensure
  sh 'docker rm -f all_images >/dev/null'
end