module Lux

die(msg, rc = 1) click to toggle source

# File lib/lux.rb, line 85
def die msg, rc = 1
  error msg
  exit rc
end

dockerip() click to toggle source

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

# 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) click to toggle source

# File lib/lux.rb, line 90
def error msg
  HighLine.new(STDIN, STDERR).say HighLine.color(msg, HighLine::RED)
end

findimage(image) click to toggle source

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

# 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) click to toggle source

# 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) click to toggle source

Return two elements:

user name (defaults to current user), and
a bash script setup command

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

# 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

Constants

Public Instance Methods