package command import ( "io" "os" "runtime" "github.com/docker/docker/pkg/term" "github.com/pkg/errors" ) // InStream is an input stream used by the DockerCli to read user input type InStream struct { in io.ReadCloser fd uintptr isTerminal bool state *term.State } func (i *InStream) Read(p []byte) (int, error) { return i.in.Read(p) } // Close implements the Closer interface func (i *InStream) Close() error { return i.in.Close() } // FD returns the file descriptor number for this stream func (i *InStream) FD() uintptr { return i.fd } // IsTerminal returns true if this stream is connected to a terminal func (i *InStream) IsTerminal() bool { return i.isTerminal } // SetRawTerminal sets raw mode on the input terminal func (i *InStream) SetRawTerminal() (err error) { if os.Getenv("NORAW") != "" || !i.isTerminal { return nil } i.state, err = term.SetRawTerminal(i.fd) return err } // RestoreTerminal restores normal mode to the terminal func (i *InStream) RestoreTerminal() { if i.state != nil { term.RestoreTerminal(i.fd, i.state) } } // CheckTty checks if we are trying to attach to a container tty // from a non-tty client input stream, and if so, returns an error. func (i *InStream) CheckTty(attachStdin, ttyMode bool) error { // In order to attach to a container tty, input stream for the client must // be a tty itself: redirecting or piping the client standard input is // incompatible with `docker run -t`, `docker exec -t` or `docker attach`. if ttyMode && attachStdin && !i.isTerminal { eText := "the input device is not a TTY" if runtime.GOOS == "windows" { return errors.New(eText + ". If you are using mintty, try prefixing the command with 'winpty'") } return errors.New(eText) } return nil } // NewInStream returns a new InStream object from a ReadCloser func NewInStream(in io.ReadCloser) *InStream { fd, isTerminal := term.GetFdInfo(in) return &InStream{in: in, fd: fd, isTerminal: isTerminal} }