Пример #1
0
// SetupRawTerminal will set terminal to RAW mode and return function to
// restore normal terminal.
func SetupRawTerminal(setSize func(cols, row uint16) error) func() {
	// Switch terminal to raw mode
	state, err := ttyutils.MakeTerminalRaw(os.Stdout.Fd())
	if err != nil {
		// If we can't do it just continue as we were
		return func() {}
	}

	// Get TTY size
	size, err := ttyutils.Winsize(os.Stdout)
	if err == nil && setSize != nil {
		setSize(size.Columns, size.Lines)
	}

	// Handle SIGWINCH signals (window resize signals from graphical terminals)
	sigWinch := make(chan os.Signal, 1)
	signal.Notify(sigWinch, syscall.SIGWINCH)
	go func() {
		for range sigWinch {
			size, err := ttyutils.Winsize(os.Stdout)
			if err == nil && setSize != nil {
				setSize(size.Columns, size.Lines)
			}
		}
	}()

	// Return a function to cleanup
	return func() {
		// Stop handling SIGWINCH, and close channel to clean up go routine
		signal.Stop(sigWinch)
		close(sigWinch)

		// Restore terminal state
		ttyutils.RestoreTerminalState(os.Stdout.Fd(), state)
		fmt.Println("")
	}
}
Пример #2
0
func doRun(color bool) int {
	if !color {
		slog.DisableColor()
		DisableErrorColor()
	}

	if os.Getenv("RAILS_ENV") != "" {
		println("Warning: Specifying a Rails environment via RAILS_ENV has no effect for commands run with zeus.")
	}

	master, slave, err := pty.Open()
	if err != nil {
		panic(err)
	}
	defer master.Close()
	if ttyutils.IsTerminal(os.Stdout.Fd()) {
		oldState, err := ttyutils.MakeTerminalRaw(os.Stdout.Fd())
		if err != nil {
			panic(err)
		}
		defer ttyutils.RestoreTerminalState(os.Stdout.Fd(), oldState)
	}

	ttyutils.MirrorWinsize(os.Stdout, master)

	addr, err := net.ResolveUnixAddr("unixgram", zeusSockName)
	if err != nil {
		panic("Can't resolve server address")
	}

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

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

	msg, err = usock.ReadMessage()
	if err != nil {
		panic(err)
	}

	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 {
		panic(err)
	}

	c := make(chan os.Signal, 1)
	signal.Notify(c, syscall.SIGWINCH, syscall.SIGCONT)
	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)
			}
		}
	}()

	var exitStatus int = -1
	if len(parts) > 2 {
		exitStatus, err = strconv.Atoi(parts[0])
		if err != nil {
			panic(err)
		}
	}

	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
			}
			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 {
			panic(err)
		}
		parts := strings.Split(msg, "\000")
		exitStatus, err = strconv.Atoi(parts[0])
		if err != nil {
			panic(err)
		}
	}

	return exitStatus
}
Пример #3
0
func Run(args []string, input io.Reader, output *os.File) int {
	if os.Getenv("RAILS_ENV") != "" {
		println("Warning: Specifying a Rails environment via RAILS_ENV has no effect for commands run with zeus.")
		println("As a safety precaution to protect you from nuking your development database,")
		println("Zeus will now cowardly refuse to proceed. Please unset RAILS_ENV and try again.")
		return 1
	}

	isTerminal := ttyutils.IsTerminal(output.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(output.Fd())
		if err != nil {
			slog.ErrorString(err.Error() + "\r")
			return 1
		}
		defer ttyutils.RestoreTerminalState(output.Fd(), oldState)
	}

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

	addr, err := net.ResolveUnixAddr("unixgram", unixsocket.ZeusSockName())
	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.New(conn)

	msg := messages.CreateCommandAndArgumentsMessage(args, os.Getpid())
	usock.WriteMessage(msg)
	err = sendCommandLineArguments(usock, args)
	if err != nil {
		slog.ErrorString(err.Error() + "\r")
		return 1
	}

	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(output, master)
					syscall.Kill(commandPid, syscall.SIGWINCH)
				} else { // member of terminatingSignals
					ttyutils.RestoreTerminalState(output.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 || (err == io.EOF && n > 0) {
				output.Write(buf[:n])
			} else {
				eof <- true
				break
			}

		}
	}()

	go func() {
		buf := make([]byte, 8192)
		for {
			n, err := input.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
}