backup_dockerhub_images.rb

ARGV.each do |keyword|
  image_family_names = `docker search #{keyword} --format '{{.Name}}'`.split("\n")
  puts( (["image family names:"] + image_family_names).join("\n") )
  image_family_names.each do |image_family_name|
    tags = `curl -s https://registry.hub.docker.com/v1/repositories/#{image_family_name}/tags | jq -r '.[].name'`.split("\n")
    puts("#{image_family_name} tags: #{tags.join(',')}")
    tags.each do |tag|
      image_name = image_family_name + ':' + tag
      file_name = image_family_name.gsub('/', '-') + '-' + tag + '.tar.gz'
      if File.exist?(file_name)
        puts "#{image_name} is already exists"
        next
      end

      puts "#{image_name} is in PROGRESS. Backup to #{file_name}"
      begin
        system("docker pull #{image_name} && docker save #{image_name} | gzip > #{file_name}", exception: true)
      rescue => e
        puts "#{image_name} Got an error #{e.inspect}"
      end
      puts "#{image_name} is DONE. Backup to #{file_name}"

    end
  end
end