Class: OpenStax::Aws::Packer_1_4_1

Inherits:
Object
  • Object
show all
Defined in:
lib/openstax/aws/packer_1_4_1.rb

Instance Method Summary collapse

Constructor Details

#initialize(absolute_file_path:, dry_run: true) ⇒ Packer_1_4_1

Returns a new instance of Packer_1_4_1.



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# File 'lib/openstax/aws/packer_1_4_1.rb', line 6

def initialize(absolute_file_path:, dry_run: true)
  @logger = OpenStax::Aws.configuration.logger
  @only = []
  @vars = {}
  @dry_run = dry_run
  @verbose = false
  @debug = false
  @absolute_file_path = absolute_file_path
end

Instance Method Details

#command ⇒ Object 



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# File 'lib/openstax/aws/packer_1_4_1.rb', line 32

def command
  cmd = "packer build"

  cmd = "#{cmd} --only=#{@only.join(',')}" if !@only.empty?

  @vars.each do |key, value|
    cmd = "#{cmd} --var '#{key}=#{value}'"
  end

  cmd = "PACKER_LOG=1 #{cmd}" if @verbose
  cmd = "#{cmd} --debug" if @debug

  cmd
end

#debug! ⇒ Object 



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# File 'lib/openstax/aws/packer_1_4_1.rb', line 28

def debug!
  @debug = true
end

#only(builders) ⇒ Object 



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# File 'lib/openstax/aws/packer_1_4_1.rb', line 16

def only(builders)
  @only = [builders].flatten
end

#run ⇒ Object 



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# File 'lib/openstax/aws/packer_1_4_1.rb', line 47

def run
  @logger.info("**** DRY RUN ****") if @dry_run
  @logger.info("Running: #{command} #{@absolute_file_path}")

  if !@dry_run
    @logger.info("Printing stderr for desired verbosity")

    tmpdir = nil

    begin
      config_path = @absolute_file_path

      # Can't handle modifying HCL2 templates yet
      if config_path.ends_with?('.json')
        config = JSON.parse(File.read(config_path))
        config['post-processors'] ||= []
        manifest_config = (config['post-processors']).find do |processor|
          processor['type'] == 'manifest'
        end

        # Configure a manifest post-processor if not already configured
        if manifest_config.nil?
          tmpdir = Dir.mktmpdir

          manifest_config = { 'type' => 'manifest', 'output' => "#{tmpdir}/manifest.json" }

          config['post-processors'] << manifest_config

          config_path = "#{tmpdir}/packer.json"

          File.write(config_path, JSON.dump(config))
        end
      end

      Open3.popen2e("#{command} #{config_path}") do |stdin, stdout_err, wait_thr|
        begin
          previous_interrupt_handler = Signal.trap 'INT' do
            # Interrupt Packer
            Process.kill 'INT', wait_thr.pid

            # Restore previous interrupt handler so we don't interrupt Packer again
            Signal.trap 'INT', previous_interrupt_handler

            # Disable other code that restores previous interrupt
            previous_interrupt_handler = nil
          end

          stdout_err.sync = true

          # Send all packer output to STDERR
          while char = stdout_err.getc do
            STDERR.print char
          end
        ensure
          # Restore previous interrupt unless we did so already
          Signal.trap 'INT', previous_interrupt_handler unless previous_interrupt_handler.nil?
        end

        # Read the AMI ID from the manifest file and output it to STDOUT
        unless manifest_config.nil?
          manifest = File.read(manifest_config['output']) rescue nil

          puts JSON.parse(manifest)['builds'].last['artifact_id'].split(':', 2).last \
            unless manifest.nil?
        end

        # Return Packer's exit status wrapped in a Process::Status object
        wait_thr.value
      end
    ensure
      FileUtils.remove_entry(tmpdir) unless tmpdir.nil?
    end
  end
end

#to_s ⇒ Object 



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# File 'lib/openstax/aws/packer_1_4_1.rb', line 122

def to_s
  command.to_s
end

#var(key, value) ⇒ Object 



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# File 'lib/openstax/aws/packer_1_4_1.rb', line 20

def var(key, value)
  @vars[key.to_s] = value.to_s
end

#verbose! ⇒ Object 



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# File 'lib/openstax/aws/packer_1_4_1.rb', line 24

def verbose!
  @verbose = true
end