Class: Dockershell

Inherits:
Object
  • Object
show all
Defined in:
lib/dockershell.rb

Defined Under Namespace

Classes: Wordgen

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Dockershell

Returns a new instance of Dockershell.



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# File 'lib/dockershell.rb', line 5

def initialize(options)
  @options = options
  @logger  = options[:logger]
  @gempath = File.expand_path('..', File.dirname(__FILE__))

  @options[:name] ||= wordgen
  @options[:fqdn] ||= "#{@options[:name]}.#{@options[:domain]}"
  @options[:profile][:volumes] ||= []

  @logger.formatter = proc do |severity, datetime, progname, msg|
    "#{datetime} #{severity.ljust(5)} [#{@options[:name]}] #{msg}\n"
  end
end

Instance Method Details

#detached_postrun ⇒ Object

This spawns a detached process to clean up. This is so it doesn’t die when the parent is killed



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# File 'lib/dockershell.rb', line 49

def detached_postrun
  @logger.info 'terminating and cleaning up.'
  cleaner = Process.fork do
    Process.setsid

    output, status = Open3.capture2e('docker', 'kill', @options[:name])
    @logger.debug output
    @logger.warn 'could not stop container' unless status.success?

    output, status = Open3.capture2e('docker', 'rm', '-f', @options[:name])
    @logger.debug output
    @logger.warn 'could not remove container' unless status.success?

    postrun
  end
  Process.detach cleaner
end

#run! ⇒ Object 



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# File 'lib/dockershell.rb', line 19

def run!
  at_exit do
    detached_postrun
  end
  prerun
  create unless running?
  setup
  start
end

#start ⇒ Object 



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# File 'lib/dockershell.rb', line 29

def start
  @logger.info 'starting Dockershell.'
  args = 'docker', 'exec', '-it', @options[:name], 'script', '-qc', 'bash', '/dev/null'
  bomb 'could not start container.' unless system(*args)
end