Class: Nutkins::CloudManager

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

Instance Method Summary collapse

Constructor Details

#initialize(project_dir: nil) ⇒ CloudManager

Returns a new instance of CloudManager.



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

def initialize(project_dir: nil)
  @img_configs = {}
  # when an image is built true is stored against it's name to avoid building it again
  @built = {}
  @etcd_running = false
  @project_root = project_dir || Dir.pwd
  cfg_path = File.join(@project_root, CONFIG_FILE_NAME)
  if File.exists? cfg_path
    @config = OpenStruct.new(YAML.load_file cfg_path)
  else
    @config = OpenStruct.new
  end
end

Instance Method Details

#build(path) ⇒ Object 



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# File 'lib/nutkins.rb', line 43

def build path
  cfg = get_image_config path
  img_dir = cfg['directory']
  img_name = cfg['image']
  return if @built[img_name]

  raise "directory `#{img_dir}' does not exist" unless Dir.exists? img_dir
  tag = cfg['tag']

  # TODO: flag to suppress building base image?
  base = cfg['base']
  unless @built[base]
    base_cfg = config_for_image base
    if base_cfg
      base_path = base_cfg['path']
      puts "building parent of #{img_name}: #{base}"
      build base_path
    end
  end
  prev_image_id = Docker.image_id_for_tag tag

  build_cfg = cfg["build"]
  if build_cfg
    # download each of the files in the resources section if it doesn't exist
    resources = build_cfg["resources"]
    Download.download_resources img_dir, resources if resources
  end

  if cfg.dig "build", "commands"
    # if build commands are available use nutkins built-in builder
    base_cfg ||= config_for_image base
    Docker::Builder::build cfg, base_cfg && base_cfg['tag']
  else
    # fallback to `docker build` which is less good
    if not Docker.run 'build', '-t', cfg['latest_tag'], '-t', tag, img_dir, stdout: true
      raise "issue building docker image for #{path}"
    end
  end

  image_id = Docker.image_id_for_tag tag
  if prev_image_id
    if image_id != prev_image_id
      puts "deleting previous image #{prev_image_id}"
      Docker.run "rmi", prev_image_id
    else
      puts "unchanged image: #{tag}"
    end
  elsif image_id
    puts "created new image #{image_id}"
  else
    puts "no image exists for image... what went wrong?"
  end
  @built[img_name] = true
end

#build_secret(path) ⇒ Object 



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# File 'lib/nutkins.rb', line 200

def build_secret path
  secret = path
  path_is_dir = Dir.exists? path
  if path_is_dir
    secret += '.tar'
    system "tar", "cf", secret, "-C", File.dirname(path), File.basename(path)
  end

  loop do
    puts "enter passphrase for #{secret}"
    break if system 'gpg', '-c', secret
  end

  File.unlink secret if path_is_dir
end

#create(path, preserve: false, docker_args: [], reuse: false) ⇒ Object 



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# File 'lib/nutkins.rb', line 98

def create path, preserve: false, docker_args: [], reuse: false
  flags = []
  cfg = get_image_config path
  create_cfg = cfg["create"]
  if create_cfg
    (create_cfg["ports"] or []).each do |port|
      flags.push '-p', "#{port}:#{port}"
    end

    img_dir = cfg['directory']
    (create_cfg["volumes"] or []).each do |volume|
      src, dest = volume.split ' -> '
      src_dir = File.absolute_path File.join(img_dir, VOLUMES_PATH, src)
      unless Dir.exists? src_dir
        src_dir = File.absolute_path File.join(@project_root, VOLUMES_PATH, src)
        raise "could not find source directory for volume #{src}" unless Dir.exists? src_dir
      end
      flags.push '-v', "#{src_dir}:#{dest}"
    end

    (create_cfg["env"] or {}).each do |name, val|
      flags.push '-e', "#{name}=#{val}"
    end

    hostname = create_cfg['hostname']
    flags.push '-h', hostname if hostname
  end

  tag = cfg['tag']
  prev_container_id = Docker.container_id_for_tag tag unless preserve

  if not reuse
    if prev_container_id
      puts "deleting previous container #{prev_container_id}"
      Docker.run "rm", prev_container_id
      prev_container_id = nil
    end
    build path
  end

  puts "creating new docker image"
  unless Docker.run "create", "-it", *flags, tag, *docker_args
    raise "failed to create `#{path}' container"
  end

  unless preserve
    container_id = Docker.container_id_for_tag tag
    if not prev_container_id.nil? and container_id != prev_container_id
      puts "deleting previous container #{prev_container_id}"
      Docker.run "rm", prev_container_id
    end
  end

  puts "created `#{path}' container"
end

#delete(path) ⇒ Object 



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# File 'lib/nutkins.rb', line 187

def delete path
  cfg = get_image_config path
  tag = cfg['tag']
  container_id = Docker.container_id_for_tag tag
  raise "no container to delete" if container_id.nil?
  puts "deleting container #{container_id}"
  Docker.run "rm", container_id
end

#delete_all ⇒ Object 



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# File 'lib/nutkins.rb', line 196

def delete_all
  puts "TODO: delete_all"
end

#exec(path, *cmd) ⇒ Object 



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# File 'lib/nutkins.rb', line 239

def exec path, *cmd
  puts "TODO: exec #{path}: #{cmd.join ' '}"
end

#extract_secrets(paths) ⇒ Object 



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# File 'lib/nutkins.rb', line 216

def extract_secrets paths
  if paths.empty?
    paths = get_all_img_paths
    # there may be secrets in the root even if there is no image build there
    paths.push '.' unless paths.include? '.'
  end

  paths.each do |path|
    get_secrets(path).each do |secret|
      loop do
        puts "enter passphrase for #{secret}"
        break if system 'gpg', secret
      end

      secret = secret[0..-5]
      if File.extname(secret) == '.tar'
        system "tar", "xf", secret, "-C", File.dirname(secret)
        File.unlink secret
      end
    end
  end
end

#run(path, reuse: false, shell: false) ⇒ Object 



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# File 'lib/nutkins.rb', line 154

def run path, reuse: false, shell: false
  cfg = get_image_config path
  tag = cfg['tag']

  start_etcd_container if cfg['etcd']
  create_args = []
  if shell
    raise '--shell and --reuse arguments are incompatible' if reuse

    # TODO: fix crash when image doesn't exist yet... the tag isn't
    #       there to be inspected yet
    # TODO: test for smell-baron
    create_args = JSON.parse(`docker inspect #{tag}`)[0]["Config"]["Cmd"]

    kill_everything = create_args[0] == '-a'
    create_args.shift if kill_everything

    create_args.unshift '/bin/bash', '---'
    create_args.unshift '-f' unless create_args[0] == '-f'
    create_args.unshift '-a' if kill_everything
    # TODO: provide version that doesn't require smell-baron
  end

  id = reuse && Docker.container_id_for_tag(tag)
  unless id
    create path, docker_args: create_args
    id = Docker.container_id_for_tag tag
    raise "couldn't create container to run `#{path}'" unless id
  end

  Kernel.exec "docker", "start", "-ai", id
end

#start_etcd_container ⇒ Object 



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# File 'lib/nutkins.rb', line 243

def start_etcd_container
  return if @etcd_running
  # TODO: move this stuff into another file
  name = get_etcd_container_name
  return unless name

  # TODO: update existing etcd server rather than creating new container...
  #       this will let confd instances respond to updates
  existing = Docker.container_id_for_name name
  if existing
    Docker.run 'stop', name
    rm_etcd_docker_container existing
  end

  gateway = Docker.run_get_stdout 'run', '--rm=true',
             'quay.io/coreos/etcd',
             'sh', '-c',
             "route -n | grep UG | awk '{ print $2 }'"

  Docker.run 'create', '--name', name, '-p', "#{ETCD_PORT}:#{ETCD_PORT}",
             'quay.io/coreos/etcd',
             'etcd', '-name', name,
             '-advertise-client-urls', "http://#{gateway}:#{ETCD_PORT}",
             '-listen-client-urls', "http://0.0.0.0:#{ETCD_PORT}"

  all_paths = get_all_img_paths
  configs = all_paths.map &method(:get_image_config)
  etcd_store = {}
  configs.each do |config|
    etcd_store.merge! config['etcd']['data'] if config.dig('etcd', 'data')

    etcd_files = config.dig('etcd', 'files')
    if etcd_files
      etcd_files.each do |file|
        etcd_data_path = File.join config['directory'], file
        begin
          etcd_store.merge! YAML.load_file(etcd_data_path)
        rescue => e
          puts "failed to load etcd data file: #{etcd_data_path}"
          puts e
        end
      end
    end
  end

  if Docker.run 'start', name
    puts 'started etcd container'
    # even after port is open it still refuses http requests for a while
    # so just sleep until it is ready... ideally test for working HTTP
    sleep 1

    etcd_store.each do |key, val|
      uri = URI("http://127.0.0.1:#{ETCD_PORT}/v2/keys/#{key}")
      req = Net::HTTP::Put.new(uri)
      req.body = 'value=' + val
      res = Net::HTTP.start(uri.hostname, uri.port) do |http|
        http.request(req)
      end

      if not res.is_a? Net::HTTPCreated
        puts "etcd: failed to set #{key} to #{val}"
        puts res
      end
    end
    @etcd_running = true
  else
    puts 'failed to start etcd container'
  end
end

#stop_etcd_container ⇒ Object 



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# File 'lib/nutkins.rb', line 313

def stop_etcd_container
  name = get_etcd_container_name
  return unless name

  existing = Docker.container_id_for_name name
  if existing
    if Docker.run 'stop', name
      puts 'stopped etcd container'
      rm_etcd_docker_container existing
    else
      puts 'failed to stop etcd container'
    end
  end
end