Module: Lux

Defined in:
lib/lux.rb,
lib/lux/version.rb,
lib/lux/docker_tasks.rb

Defined Under Namespace

Classes: App, DockerContainerTask, DockerImageTask

Constant Summary collapse

VERSION = 
"1.1.4"
DISABLED = 
case
when version.nil?
   error "Docker server not found, disabling Docker tasks!"
   true
else
   begin
     # Set this to avoid 5 sec timeouts with .local addresses
     # which don't resolve in IPv6
     Docker.options = { family: Socket::Constants::AF_INET, connect_timeout: 5 }
     Docker.validate_version!
     false
   rescue Exception => e
     error "Docker problem (#{e.message}), tasks will be disabled"
     true
   end
end

Class Method Summary collapse

Class Method Details

.die(msg, rc = 1) ⇒ Object 



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# File 'lib/lux.rb', line 85

def die msg, rc = 1
  error msg
  exit rc
end

.dockerip ⇒ Object

Determine the IPv4 address of the current Docker host Used to avoid long reverse DNS lookups on .local names Also useful when running Docker for macOS which runs on a Unix socket but makes container ports available on localhost

Returns an array of three items:

  • the IPv4 address as a string or ‘127.0.0.1’ if it was a Unix socket

  • a URI object

  • a hash containing the Docker version information

These are all nil if no Docker server is found



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# File 'lib/lux.rb', line 22

def dockerip
  begin
    info = Docker.version
    uri = URI.parse Docker.url
    case uri.scheme
    when 'unix'
      addr = '127.0.0.1'
    when 'tcp'
      Addrinfo.tcp(uri.host, uri.port).connect(timeout: 5) {|s|
        addr = s.remote_address.ip_address
        s.print "GET /version HTTP/1.0\r\nHost: localhost\r\n\r\n"
        response, emptyline, body = s.read.partition(/(\r\n){2}/)
        versioninfo = JSON.parse(body, symbolize_names: false)
      }
    else
      raise "Can't handle #{uri.scheme}"
    end
    return addr, uri, info
  rescue
    return nil, nil, nil
  end
end

.error(msg) ⇒ Object 



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# File 'lib/lux.rb', line 90

def error msg
  HighLine.new(STDIN, STDERR).say HighLine.color(msg, HighLine::RED)
end

.findimage(image) ⇒ Object

Get the current list of images and make a guess at which one it is…



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# File 'lib/lux.rb', line 47

def findimage image
  local_images = `docker images`.strip.split("\n")[1..-1].map{|l| l.gsub!(/^(\S+)\s+(\S+).*/,'\1:\2')}.sort
  matching_images = local_images.select{|l| l.include? image }
  if matching_images.size > 0
    if image.count(':') == 0 and image.count('/') > 0
      matching_image = matching_images.select{|l| l.end_with? ':latest' }.first
    end
    unless matching_image
      if matching_images.size == 1
        matching_image = matching_images[0]
      else
        matching_image = HighLine.choose do |menu|
          menu.header = 'List of matching (local) images'
          menu.choices(*matching_images)
          menu.choice('None of the above') { nil }
        end
        exit 2 unless matching_image
      end
    end
  else
    matching_image = image
  end
  return matching_image
end

.info(msg) ⇒ Object 



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# File 'lib/lux.rb', line 94

def info msg
  HighLine.new(STDIN, STDERR).say HighLine.color(msg, HighLine::YELLOW)
end

.user_setup_cmd(user = `id -nu`.strip) ⇒ Object

Return two elements:

  • user name (defaults to current user), and

  • a bash script setup command

Omit the secret password: -p $1$Ih5pLngr$/boiJHqKbQm9AP/QQyq0b1



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# File 'lib/lux.rb', line 77

def user_setup_cmd user = `id -nu`.strip
  [user, <<-COMMAND.gsub(/^\s*/,'').gsub(/\n/,' ; ')]
    useradd -M -d #{ENV['HOME']} -u #{Process.uid} -s #{ENV['SHELL']} #{user}
    mkdir -p /etc/sudoers.d
    echo "#{user} ALL=(ALL:ALL) NOPASSWD: ALL" > /etc/sudoers.d/#{user}
  COMMAND
end