func (process *groupProcess) SetWindowSize(size garden.WindowSize) error {
if process.processPty != nil {
return ptyutil.SetWinSize(process.processPty, size.Columns, size.Rows)
}
return nil
}
func spawn(cmd *exec.Cmd, ttySpec *garden.TTYSpec, stdout io.Writer, stderr io.Writer) (process, io.WriteCloser, error) {
var stdin io.WriteCloser
var err error
var processPty *os.File
if ttySpec != nil {
pty, tty, err := pty.Open()
if err != nil {
return nil, nil, err
}
// close our end of the tty after the process has spawned
defer tty.Close()
processPty = pty
stdin = pty
windowColumns := 80
windowRows := 24
if ttySpec.WindowSize != nil {
windowColumns = ttySpec.WindowSize.Columns
windowRows = ttySpec.WindowSize.Rows
}
ptyutil.SetWinSize(pty, windowColumns, windowRows)
cmd.Stdin = tty
cmd.Stdout = tty
cmd.Stderr = tty
go io.Copy(stdout, pty)
} else {
stdin, err = cmd.StdinPipe()
if err != nil {
return nil, nil, err
}
cmd.Stdout = stdout
cmd.Stderr = stderr
}
err = cmd.Start()
if err != nil {
return nil, nil, err
}
return &groupProcess{
process: cmd.Process,
processPty: processPty,
}, stdin, nil
}