Module: Kontena::Cli::Apps::DockerHelper

Included in:
BuildCommand, DeployCommand
Defined in:
lib/kontena/cli/apps/docker_helper.rb

Instance Method Summary collapse

Instance Method Details

#build_docker_image(service, no_cache = false) ⇒ Integer

Parameters:

  • service (Hash)
  • no_cache (Boolean) (defaults to: false)

Returns:

  • (Integer) 


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# File 'lib/kontena/cli/apps/docker_helper.rb', line 34

def build_docker_image(service, no_cache = false)
  dockerfile = dockerfile = service['build']['dockerfile'] || 'Dockerfile'
  build_context = service['build']['context']
  cmd = ['docker', 'build', '-t', service['image']]
  cmd << ['-f', File.join(File.expand_path(build_context), dockerfile)] if dockerfile != "Dockerfile"
  cmd << '--no-cache' if no_cache
  args = service['build']['args'] || {}
  args.each do |k, v|
    cmd << "--build-arg=#{k}=#{v}"
  end
  cmd << build_context
  ret = system(*cmd.flatten)
  raise ("Failed to build image #{service['image'].colorize(:cyan)}") unless ret
  ret
end

#dockerfile_exist?(path, dockerfile) ⇒ Boolean

Parameters:

Returns:

  • (Boolean) 


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# File 'lib/kontena/cli/apps/docker_helper.rb', line 67

def dockerfile_exist?(path, dockerfile)
  file = File.join(File.expand_path(path), dockerfile)
  File.exist?(file)
end

#image_exist?(image) ⇒ Boolean

Parameters:

Returns:

  • (Boolean) 


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# File 'lib/kontena/cli/apps/docker_helper.rb', line 60

def image_exist?(image)
  system("docker history '#{image}' >/dev/null 2>/dev/null")
end

#process_docker_images(services, force_build = false, no_cache = false) ⇒ Object

Parameters:

  • services (Hash)
  • force_build (Boolean) (defaults to: false)
  • no_cache (Boolean) (defaults to: false) 


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# File 'lib/kontena/cli/apps/docker_helper.rb', line 7

def process_docker_images(services, force_build = false, no_cache = false)
  services.each do |name, service|
    if service['build'] && (!image_exist?(service['image']) || force_build)
      dockerfile = service['build']['dockerfile'] || 'Dockerfile'
      raise ("'#{service['image']}' is not valid Docker image name") unless validate_image_name(service['image'])
      raise ("'#{service['build']['context']}' does not have #{dockerfile}") unless dockerfile_exist?(service['build']['context'], dockerfile)
      if service['hooks'] && service['hooks']['pre_build']
        puts "Running pre_build hook".colorize(:cyan)
        run_pre_build_hook(service['hooks']['pre_build'])
      end
      puts "Building image #{service['image'].colorize(:cyan)}"
      build_docker_image(service, no_cache)
      puts "Pushing image #{service['image'].colorize(:cyan)} to registry"
      push_docker_image(service['image'])
    end
  end
end

#push_docker_image(image) ⇒ Integer

Parameters:

Returns:

  • (Integer) 


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# File 'lib/kontena/cli/apps/docker_helper.rb', line 52

def push_docker_image(image)
  ret = system('docker', 'push', image)
  raise ("Failed to push image #{image.colorize(:cyan)}") unless ret
  ret
end

#run_pre_build_hook(hook) ⇒ Object

Parameters:

  • hook (Hash) 


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# File 'lib/kontena/cli/apps/docker_helper.rb', line 73

def run_pre_build_hook(hook)
  hook.each do |h|
    ret = system(h['cmd'])
    raise ("Failed to run pre_build hook: #{h['name']}!") unless ret
  end
end

#validate_image_name(name) ⇒ Boolean

Parameters:

Returns:

  • (Boolean) 


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# File 'lib/kontena/cli/apps/docker_helper.rb', line 27

def validate_image_name(name)
  !(/^[\w.\/\-:]+:?+[\w+.]+$/ =~ name).nil?
end