bluepill-rb/bluepill

#!/usr/bin/env ruby
require 'optparse'
require 'bluepill'

begin
  require 'rbconfig'
rescue LoadError
end

RbConfig = Config unless Object.const_defined?(:RbConfig)

# Default options
options = {
  log_file: '/var/log/bluepill.log',
  base_dir: ENV['BLUEPILL_BASE_DIR'] || (::Process.euid != 0 ? File.join(ENV['HOME'], '.bluepill') : '/var/run/bluepill'),
  privileged: true,
  timeout: 10,
  attempts: 1,
}

OptionParser.new do |opts|
  opts.banner = 'Usage: bluepill [app] cmd [options]'
  opts.on('-l', '--logfile LOGFILE', "Path to logfile, defaults to #{options[:log_file]}") do |file|
    options[:log_file] = file
  end

  opts.on('-c', '--base-dir DIR', "Directory to store bluepill socket and pid files, defaults to #{options[:base_dir]}") do |base_dir|
    options[:base_dir] = base_dir
  end

  opts.on('-v', '--version') do
    puts "bluepill, version #{Bluepill::Version}"
    exit
  end

  opts.on('--[no-]privileged', "Allow/disallow to run #{$PROGRAM_NAME} as non-privileged process. disallowed by default") do |v|
    options[:privileged] = v
  end

  opts.on('-t', '--timeout Seconds', Integer, 'Timeout for commands sent to the daemon, in seconds. Defaults to 10.') do |timeout|
    options[:timeout] = timeout
  end

  opts.on('--attempts Count', Integer, 'Attempts for commands sent to the daemon, in seconds. Defaults to 1.') do |attempts|
    options[:attempts] = attempts
  end

  help = proc do
    puts opts
    puts
    puts 'Commands:'
    puts "    load CONFIG_FILE\t\tLoads new instance of bluepill using the specified config file"
    puts "    status\t\t\tLists the status of the proceses for the specified app"
    puts "    start [TARGET]\t\tIssues the start command for the target process or group, defaults to all processes"
    puts "    stop [TARGET]\t\tIssues the stop command for the target process or group, defaults to all processes"
    puts "    restart [TARGET]\t\tIssues the restart command for the target process or group, defaults to all processes"
    puts "    unmonitor [TARGET]\t\tStop monitoring target process or group, defaults to all processes"
    puts "    log [TARGET]\t\tShow the log for the specified process or group, defaults to all for app"
    puts "    quit\t\t\tStop bluepill"
    puts
    puts 'See http://github.com/bluepill-rb/bluepill#readme'
    exit
  end

  opts.on_tail('-h', '--help', 'Show this message', &help)
  help.call if ARGV.empty?
end.parse!

# Check for root
if options[:privileged] && ::Process.euid != 0
  $stderr.puts 'You must run bluepill as root or use --no-privileged option.'
  exit(3)
end

APPLICATION_COMMANDS = %w(status start stop restart unmonitor quit log).freeze

controller = Bluepill::Controller.new(options.slice(:base_dir, :log_file))

if controller.running_applications.include?(File.basename($PROGRAM_NAME)) && File.symlink?($PROGRAM_NAME)
  # bluepill was called as a symlink with the name of the target application
  options[:application] = File.basename($PROGRAM_NAME)
elsif controller.running_applications.include?(ARGV.first)
  # the first arg is the application name
  options[:application] = ARGV.shift
elsif APPLICATION_COMMANDS.include?(ARGV.first)
  if controller.running_applications.length == 1
    # there is only one, let's just use that
    options[:application] = controller.running_applications.first
  elsif controller.running_applications.length > 1
    # There is more than one, tell them the list and exit
    $stderr.puts "You must specify an application name to run that command. Here's the list of running applications:"
    controller.running_applications.each_with_index do |app, index|
      $stderr.puts "  #{index + 1}. #{app}"
    end
    $stderr.puts 'Usage: bluepill [app] cmd [options]'
    exit(1)
  else
    # There are none running AND they aren't trying to start one
    $stderr.puts "Error: There are no running bluepill daemons.\nTo start a bluepill daemon, use: bluepill load <config file>"
    exit(2)
  end
end

options[:command] = ARGV.shift

if options[:command] == 'load'
  file = ARGV.shift
  if File.exist?(file)
    # Restart the ruby interpreter for the config file so that anything loaded here
    # does not stay in memory for the daemon
    ruby = File.join(RbConfig::CONFIG['bindir'], RbConfig::CONFIG['ruby_install_name'])
    load_path = File.expand_path("#{File.dirname(__FILE__)}/../lib")
    file_path = File.expand_path(file)
    ENV['BLUEPILL_BASE_DIR'] = options[:base_dir]

    exec(ruby, "-I#{load_path}", '-rbluepill', file_path)

  else
    $stderr.puts "Can't find file: #{file}"
  end
else
  target = ARGV.shift
  controller.handle_command(options[:application], options[:command], target)
end