Module: RackDaemon

Defined in:
lib/app-deploy/rack_daemon.rb

Class Method Summary collapse

Class Method Details

.change_privilege(user, group) ⇒ Object

extracted from thin Change privileges of the process to the specified user and group.



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# File 'lib/app-deploy/rack_daemon.rb', line 33

def change_privilege 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
    puts "Changing process privilege to #{user}:#{group}"

    # 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
  puts "Couldn't change user and group to #{user}:#{group}: #{e}"
end

.daemonize(pid_path, log_path, user, group, chdir) ⇒ Object 



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# File 'lib/app-deploy/rack_daemon.rb', line 10

def daemonize pid_path, log_path, user, group, chdir
  Dir.chdir(chdir) if chdir

  user  ||= Etc.getpwuid(Process.uid).name
  group ||= Etc.getpwuid(Process.gid).name

  RackDaemon.change_privilege(user, group)

  cwd = Dir.pwd
  Daemonize.daemonize(log_path, 'rack-cluster')
  Dir.chdir(cwd)

  RackDaemon.write_pid(pid_path)

  at_exit{
    puts "Stopping #{pid_path}..."
    RackDaemon.remove_pid(pid_path)
  }
end

.remove_pid(path) ⇒ Object 



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# File 'lib/app-deploy/rack_daemon.rb', line 58

def remove_pid path
  File.delete(path) if File.exist?(path)
end

.write_pid(path) ⇒ Object 



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# File 'lib/app-deploy/rack_daemon.rb', line 52

def write_pid path
  FileUtils.mkdir_p(File.dirname(path))
  File.open(path, 'w'){ |f| f.write(Process.pid) }
  File.chmod(0644, path)
end