DockerCLI/command/in.go

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package command
import (
"errors"
"io"
"os"
"runtime"
"github.com/docker/docker/pkg/term"
)
// 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}
}