Module: Wakame::Daemonize

Defined in:
lib/isono/daemonize.rb

Instance Method Summary collapse

Instance Method Details

#change_privilege(user, group = user) ⇒ Object

Change privileges of the process to the specified user and group.



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# File 'lib/isono/daemonize.rb', line 21

def change_privilege(user, group=user)
  Wakame.log.info("Changing process privilege to #{user}:#{group}")

  uid, gid = Process.euid, Process.egid
  target_uid = Etc.getpwnam(user).uid
  target_gid = Etc.getgrnam(group).gid

  if uid != target_uid || gid != target_gid
    if pid_file && File.exist?(pid_file) && uid == 0
      File.chown(target_uid, target_gid, pid_file)
    end

    # Change process ownership
    Process.initgroups(user, target_gid)
    Process::GID.change_privilege(target_gid)
    Process::UID.change_privilege(target_uid)
  end
rescue Errno::EPERM => e
  Wakame.log.error("Couldn't change user and group to #{user}:#{group}: #{e}")
end

#daemonize(log_path) ⇒ Object 



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# File 'lib/isono/daemonize.rb', line 61

def daemonize(log_path)
  # Cleanup stale pidfile or prevent from multiple process running.
  if File.exist?(pid_file)
    if pid && Process.running?(pid)
      raise "#{pid_file} already exists, seems like it's already running (process ID: #{pid}). " +
        "Stop the process or delete #{pid_file}."
    else
      Wakame.log.info "Deleting the stale PID file: #{pid_file}"
      remove_pidfile
    end
  end

  ::Daemonize.daemonize(log_path, File.basename($0.to_s))

  setup_pidfile
  #Signal.trap('HUP') {}
end

#on_restart(&blk) ⇒ Object 



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# File 'lib/isono/daemonize.rb', line 79

def on_restart(&blk)
  @on_restart = blk
end

#pid ⇒ Object 



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# File 'lib/isono/daemonize.rb', line 46

def pid
  File.exist?(pid_file) ? open(pid_file).read.to_i : nil
end

#pid_file ⇒ Object 



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# File 'lib/isono/daemonize.rb', line 42

def pid_file
  @options[:pid_file]
end

#remove_pidfile ⇒ Object 



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# File 'lib/isono/daemonize.rb', line 89

def remove_pidfile
  File.delete(pid_file) if pid_file && File.exist?(pid_file)
rescue => e
  Wakame.log.error(e)
end

#restart ⇒ Object 



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# File 'lib/isono/daemonize.rb', line 83

def restart
  raise '' if @on_restart.nil?

  @on_restart.call
end

#setup_pidfile ⇒ Object 



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# File 'lib/isono/daemonize.rb', line 50

def setup_pidfile
  #raise 'Please implement pid_file() method' unless respond_to? :pid_file

  unless File.exist?(File.dirname(pid_file))
    FileUtils.mkpath(File.dirname(pid_file))
  end

  open(pid_file, "w") { |f| f.write(Process.pid) }
  File.chmod(0644, pid_file)
end