Exemplo n.º 1
0
// In "SBooting", we have a pid and socket to the process we will use,
// but it has not yet finished initializing (generally, running the code
// specific to this slave. When we receive a message about the success or
// failure of this operation, we transition to either crashed or ready.
func (s *SlaveNode) doBootingState() string { // -> {SCrashed, SReady}
	// The slave will execute its action and respond with a status...
	// Note we don't hold the mutex while waiting for the action to execute.
	msg, err := s.socket.ReadMessage()
	if err != nil {
		slog.Error(err)
	}

	s.L.Lock()
	defer s.L.Unlock()

	msg, err = messages.ParseActionResponseMessage(msg)
	if err != nil {
		slog.ErrorString("[" + s.Name + "] " + err.Error())
	}
	if msg == "OK" {
		return SReady
	}

	if s.Pid > 0 {
		syscall.Kill(s.Pid, syscall.SIGKILL)
	}
	s.wipe()
	s.Error = msg
	return SCrashed
}
Exemplo n.º 2
0
func (s *SlaveNode) SlaveWasInitialized(pid int, usock *unixsocket.Usock, featurePipeFd int) {
	file := os.NewFile(uintptr(featurePipeFd), "featurepipe")

	s.L.Lock()
	s.wipe()
	s.featurePipe = file
	s.Pid = pid
	s.socket = usock
	if s.State == SUnbooted {
		s.event <- true
	} else {
		if pid > 0 {
			syscall.Kill(pid, syscall.SIGKILL)
		}
		slog.ErrorString("Unexpected process for slave `" + s.Name + "` was killed")
	}
	s.L.Unlock()
}
Exemplo n.º 3
0
func doRun() int {
	if os.Getenv("RAILS_ENV") != "" {
		println("Warning: Specifying a Rails environment via RAILS_ENV has no effect for commands run with zooms.")
	}

	isTerminal := ttyutils.IsTerminal(os.Stdout.Fd())

	var master, slave *os.File
	var err error
	if isTerminal {
		master, slave, err = pty.Open()
	} else {
		master, slave, err = unixsocket.Socketpair(syscall.SOCK_STREAM)
	}
	if err != nil {
		slog.ErrorString(err.Error() + "\r")
		return 1
	}

	defer master.Close()
	var oldState *ttyutils.Termios
	if isTerminal {
		oldState, err = ttyutils.MakeTerminalRaw(os.Stdout.Fd())
		if err != nil {
			slog.ErrorString(err.Error() + "\r")
			return 1
		}
		defer ttyutils.RestoreTerminalState(os.Stdout.Fd(), oldState)
	}

	// should this happen if we're running over a pipe? I think maybe not?
	ttyutils.MirrorWinsize(os.Stdout, master)

	addr, err := net.ResolveUnixAddr("unixgram", zoomsSockName)
	if err != nil {
		slog.ErrorString(err.Error() + "\r")
		return 1
	}

	conn, err := net.DialUnix("unix", nil, addr)
	if err != nil {
		zerror.ErrorCantConnectToMaster()
		return 1
	}
	usock := unixsocket.NewUsock(conn)

	msg := messages.CreateCommandAndArgumentsMessage(os.Args[1], os.Getpid(), os.Args[2:])
	usock.WriteMessage(msg)
	usock.WriteFD(int(slave.Fd()))
	slave.Close()

	msg, err = usock.ReadMessage()
	if err != nil {
		slog.ErrorString(err.Error() + "\r")
		return 1
	}

	parts := strings.Split(msg, "\000")
	commandPid, err := strconv.Atoi(parts[0])
	defer func() {
		if commandPid > 0 {
			// Just in case.
			syscall.Kill(commandPid, 9)
		}
	}()

	if err != nil {
		slog.ErrorString(err.Error() + "\r")
		return 1
	}

	if isTerminal {
		c := make(chan os.Signal, 1)
		handledSignals := append(append(terminatingSignals, syscall.SIGWINCH), syscall.SIGCONT)
		signal.Notify(c, handledSignals...)
		go func() {
			for sig := range c {
				if sig == syscall.SIGCONT {
					syscall.Kill(commandPid, syscall.SIGCONT)
				} else if sig == syscall.SIGWINCH {
					ttyutils.MirrorWinsize(os.Stdout, master)
					syscall.Kill(commandPid, syscall.SIGWINCH)
				} else { // member of terminatingSignals
					ttyutils.RestoreTerminalState(os.Stdout.Fd(), oldState)
					print("\r")
					syscall.Kill(commandPid, sig.(syscall.Signal))
					os.Exit(1)
				}
			}
		}()
	}

	var exitStatus int = -1
	if len(parts) > 2 {
		exitStatus, err = strconv.Atoi(parts[0])
		if err != nil {
			slog.ErrorString(err.Error() + "\r")
			return 1
		}
	}

	eof := make(chan bool)
	go func() {
		for {
			buf := make([]byte, 1024)
			n, err := master.Read(buf)
			if err != nil {
				eof <- true
				break
			}
			os.Stdout.Write(buf[:n])
		}
	}()

	go func() {
		buf := make([]byte, 8192)
		for {
			n, err := os.Stdin.Read(buf)
			if err != nil {
				eof <- true
				break
			}
			if isTerminal {
				for i := 0; i < n; i++ {
					switch buf[i] {
					case sigInt:
						syscall.Kill(commandPid, syscall.SIGINT)
					case sigQuit:
						syscall.Kill(commandPid, syscall.SIGQUIT)
					case sigTstp:
						syscall.Kill(commandPid, syscall.SIGTSTP)
						syscall.Kill(os.Getpid(), syscall.SIGTSTP)
					}
				}
			}
			master.Write(buf[:n])
		}
	}()

	<-eof

	if exitStatus == -1 {
		msg, err = usock.ReadMessage()
		if err != nil {
			slog.ErrorString(err.Error() + "\r")
			return 1
		}
		parts := strings.Split(msg, "\000")
		exitStatus, err = strconv.Atoi(parts[0])
		if err != nil {
			slog.ErrorString(err.Error() + "\r")
			return 1
		}
	}

	return exitStatus
}