Class: DockerSpec

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/docker/spec.rb

Overview

Documentation

Constant Summary collapse

CONTAINER_RUN_WAIT_TIMEOUT = 
60
CONFIG_FILE = 
'docker_spec.yml'
ROOT_DIR = 
'root'
DOCKER_AUTH_FILE = 
'~/.docker/config.json'

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#config ⇒ Object

Returns the value of attribute config.



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# File 'lib/docker/spec.rb', line 22

def config
  @config
end

#test_failed ⇒ Object

Returns the value of attribute test_failed.



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# File 'lib/docker/spec.rb', line 22

def test_failed
  @test_failed
end

Instance Method Details

#build_docker_image ⇒ Object 



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# File 'lib/docker/spec.rb', line 118

def build_docker_image
  puts
  # Rebuild the cache filesystem
  build_args = ''
  build_args += ' --no-cache' if @config[:clear_cache]

  # Build the docker image
  build_cmd = "docker build -t #{@config[:image_name]} #{build_args} ."
  status = POpen4.popen4(build_cmd) do |stdout, stderr, _stdin|
    stdout.each { |line| puts line }
    stderr.each { |line| puts line.red }
  end
  fail("#{build_cmd} failed") if status.exitstatus != 0
end

#build_root ⇒ Object 



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# File 'lib/docker/spec.rb', line 111

def build_root
  system 'bash -ec \'sudo chown root:root -R root &&' \
         '(cd root && sudo tar zcf ../root.tar.gz .) && ' \
         'sudo chown -R `id -u`:`id -g` root.tar.gz root\'' \
         if Dir.exist?(ROOT_DIR)
end

#clean_up ⇒ Object 



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# File 'lib/docker/spec.rb', line 187

def clean_up
  # Keep container running
  @config[:keep_running] = get_config(:keep_running, 'DOCKER_SPEC_KEEP_RUNNING',
                                                 "\nKeep container running? ")
  if @config[:keep_running]
    puts "\nINFO: To connect to a running container: \n\n" \
      "docker exec -ti #{@config[:container_name]} bash"
  else
    delete_container
  end
end

#delete_container ⇒ Object 



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# File 'lib/docker/spec.rb', line 179

def delete_container
  filters = { name: [@config[:container_name]] }.to_json
  Docker::Container.all(all: true, filters: filters).each do |c|
    c.kill
    c.delete
  end
end

#get_config(key, envvar, question) ⇒ Object 



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# File 'lib/docker/spec.rb', line 199

def get_config(key, envvar, question)
  value = to_boolean(ENV[envvar])
  value = @config[key] if value.nil?
  value = agree(question, 'n') if value.nil?
  value
end

#load_config ⇒ Object 



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# File 'lib/docker/spec.rb', line 93

def load_config
  File.exist?(CONFIG_FILE) || fail('Could not load docker_spec.yml')
  @config = YAML.load(File.read(CONFIG_FILE)) ||
            fail('docker_spec.yml is not a valid yml file')

  @config[:name] || fail('name is not defined in docker_spec.yml')
  @config[:account] || fail('account is not defined in docker_spec.yml')
  @config[:image_name] = format '%s/%s', @config[:account], @config[:name]
  @config[:container_name] = format 'docker_spec-%s', @config[:name]
  @config[:build_image] = get_config(:build_image, 'DOCKER_SPEC_BUILD_DOCKER_IMAGE',
                                     'Build docker image? ')
  @config[:build_root] = get_config(:build_root, 'DOCKER_SPEC_BUILD_ROOT',
                                    'Rebuild root filesystem? ') if @config[:build_image]
  @config[:clear_cache] = get_config(:clear_cache, 'DOCKER_SPEC_CLEAR_CACHE',
                                     'Clear docker cache? ') if @config[:build_image]
  @config
end

#push ⇒ Object 



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# File 'lib/docker/spec.rb', line 40

def push
  @config[:push_container] = get_config(:push_container, 'DOCKER_SPEC_PUSH_CONTAINER',
                                                   'Push new tag? ')
  if @config[:push_container]

    @config[:tag_db] ||
      fail('tag_db is not defined in docker_spec.yml')

    # Load credentials from config file, or default docker config
    if @config[:dockerhub]
      @config[:dockerhub][:username] ||
        fail('dockerhub->username is not defined in docker_spec.yml')
      @config[:dockerhub][:password] ||
        fail('dockerhub->password is not defined in docker_spec.yml')
      @config[:dockerhub][:email] ||
        fail('dockerhub->email is not defined in docker_spec.yml')
    else
      @config[:dockerhub] = Hash.new
      docker_auth = JSON.parse(File.read(File.expand_path(DOCKER_AUTH_FILE)))
      auth_base64 = docker_auth['auths']['https://index.docker.io/v1/']['auth']
      @config[:dockerhub][:username] = Base64.decode64(auth_base64).split(':').first
      @config[:dockerhub][:password] = Base64.decode64(auth_base64).split(':').last
      @config[:dockerhub][:email] = docker_auth['auths']['https://index.docker.io/v1/']['email']
    end

    # Open key value store and get the current tag for this repo
    store = Moneta.new(:YAML, file: File.expand_path(@config[:tag_db]))
    current_tag = store.key?(@config[:image_name]) ? store[@config[:image_name]].to_i : 0
    new_tag = current_tag + 1

    image = Docker::Image.all.detect do |i|
      i.info['RepoTags'].include?(@config[:image_name] + ':latest')
    end

    # Login to docker hub and push latest and new_tag
    Docker.authenticate! username: @config[:dockerhub][:username],
                         password: @config[:dockerhub][:password],
                         email: @config[:dockerhub][:email]

    image.tag repo: @config[:image_name], tag: new_tag, force: true
    puts "\nINFO: pushing #{@config[:image_name]}:#{new_tag} to DockerHub"
    image.push nil, tag: new_tag

    image.tag repo: @config[:image_name], tag: 'latest', force: true
    puts "INFO: pushing #{@config[:image_name]}:latest to DockerHub"
    image.push nil, tag: 'latest'

    # Store the new tag in the tag_db
    store[@config[:image_name]] = new_tag
    store.close
  end
end

#rspec_configure ⇒ Object 



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# File 'lib/docker/spec.rb', line 133

def rspec_configure
  set :backend, :docker

  RSpec.configure do |rc|
    rc.fail_fast = true

    rc.after(:each) do |test|
      DockerSpec.instance.test_failed = true if test.exception
    end

    rc.before(:suite) do
      DockerSpec.instance.delete_container
      DockerSpec.instance.start_container
    end

    rc.after(:suite) do
      DockerSpec.instance.clean_up
      DockerSpec.instance.push unless DockerSpec.instance.test_failed
    end
  end
  Docker::Spec::docker_tests
end

#run ⇒ Object 



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# File 'lib/docker/spec.rb', line 30

def run
  @config = nil
  @test_failed = false

  load_config
  build_root if @config[:build_root]
  build_docker_image if @config[:build_image]
  rspec_configure
end

#start_container ⇒ Object 



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# File 'lib/docker/spec.rb', line 156

def start_container
  # Run  the container with options
  opts = {}
  opts['HostConfig'] = { 'NetworkMode' => @config[:network_mode] } \
    unless @config[:network_mode].nil?

  opts['env'] = @config[:env] unless @config[:env].nil?
  opts['Image'] = @config[:image_name]
  opts['name'] = @config[:container_name]
  container = Docker::Container.create(opts).start

  # Check the logs, when it stops logging we can assume the container
  # is fully up and running
  log_size_ary = []
  CONTAINER_RUN_WAIT_TIMEOUT.times do
    log_size_ary << container.logs(stdout: true).size
    break if log_size_ary.last(3).sort.uniq.size == 1 &&
             log_size_ary.last(3).sort.uniq.last > 0
    sleep 1
  end
  set :docker_container, container.id
end

#to_boolean(str) ⇒ Object 



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# File 'lib/docker/spec.rb', line 206

def to_boolean(str)
  str == 'true' unless str.nil?
end