func pipePty(cmd *exec.Cmd, handler *interactive.ShellHandler) error {
// Start the shell as TTY
f, err := pty.Start(cmd)
if err == nil {
// Connect pipes (close stderr as tty only has two streams)
go ioext.CopyAndClose(f, handler.StdinPipe())
go ioext.CopyAndClose(handler.StdoutPipe(), f)
go handler.StderrPipe().Close()
// Start communication
handler.Communicate(func(cols, rows uint16) error {
return setTTYSize(f, cols, rows)
}, func() error {
if cmd.Process != nil {
return cmd.Process.Kill()
}
return nil
})
}
// If pty wasn't supported for some reason we fall back to normal execution
if err == pty.ErrUnsupported {
return pipeCommand(cmd, handler)
}
if err != nil {
handler.Communicate(nil, func() error {
// If cmd.Start() failed, then we don't have a process, but we start
// the communication flow anyways.
if cmd.Process != nil {
return cmd.Process.Kill()
}
return nil
})
}
return err
}
func (cmd) Execute(arguments map[string]interface{}) bool {
URL := arguments["<URL>"].(string)
command := arguments["<command>"].([]string)
tty := isatty.IsTerminal(os.Stdout.Fd())
// Parse URL
u, err := url.Parse(URL)
if err != nil {
fmt.Println("Failed to parse URL, error: ", err)
return false
}
qs := u.Query()
// Set the command, if we have one
if len(command) > 0 {
qs["command"] = command
}
// Set tty=true if we're in a tty
if tty {
qs.Set("tty", "true")
}
// Update query string
u.RawQuery = qs.Encode()
// Connect to remove websocket
ws, res, err := dialer.Dial(u.String(), nil)
if err == websocket.ErrBadHandshake {
fmt.Println("Failed to connect, status: ", res.StatusCode)
return false
}
if err != nil {
fmt.Println("Failed to connect, error: ", err)
return false
}
// Create shell client
shell := shellclient.New(ws)
// Switch terminal to raw mode
cleanup := func() {}
if tty {
cleanup = SetupRawTerminal(shell.SetSize)
}
// Connect pipes
go ioext.CopyAndClose(shell.StdinPipe(), os.Stdin)
go io.Copy(os.Stdout, shell.StdoutPipe())
go io.Copy(os.Stderr, shell.StderrPipe())
// Wait for shell to be done
success, _ := shell.Wait()
// If we were in a tty we let's restore state
cleanup()
return success
}
func (s *ShellServer) handleShell(ws *websocket.Conn, shell engines.Shell) {
done := make(chan struct{})
// Create a shell handler
s.updateRefCount(1)
handler := NewShellHandler(ws, s.log.WithField("shell-instance-id", s.nextID()))
// Connect pipes
go ioext.CopyAndClose(shell.StdinPipe(), handler.StdinPipe())
go ioext.CopyAndClose(handler.StdoutPipe(), shell.StdoutPipe())
go ioext.CopyAndClose(handler.StderrPipe(), shell.StderrPipe())
// Start streaming
handler.Communicate(shell.SetSize, shell.Abort)
// Wait for call to abort all shells
go func() {
select {
case <-s.done:
shell.Abort()
case <-done:
}
}()
// Wait for the shell to terminate
success, _ := shell.Wait()
handler.Terminated(success)
s.updateRefCount(-1)
// Close done so we stop waiting for abort on all shells
select {
case <-done:
default:
close(done)
}
}
// StartProcess starts a new process with given arguments, environment variables,
// and current working folder, running as given user.
//
// Returns an human readable error explaining why the sub-process couldn't start
// if not successful.
func StartProcess(options ProcessOptions) (*Process, error) {
// Default arguments to system shell
if len(options.Arguments) == 0 {
options.Arguments = []string{defaultShell}
}
// If WorkingFolder isn't set find home folder of options.Owner (if set)
// or current user
if options.WorkingFolder == "" {
if options.Owner != nil {
options.WorkingFolder = options.Owner.homeFolder
} else {
u, err := user.Current()
if err != nil {
panic(fmt.Sprintf("Failed to lookup current user, error: %s", err))
}
options.WorkingFolder = u.HomeDir
}
}
// Default stdout to os.DevNul
if options.Stdout == nil {
options.Stdout = ioext.WriteNopCloser(ioutil.Discard)
}
// Default stderr to stdout
if options.Stderr == nil {
options.Stderr = options.Stdout
}
// Create process and command
p := &Process{}
p.cmd = exec.Command(options.Arguments[0], options.Arguments[1:]...)
p.cmd.Env = formatEnv(options.Environment)
p.cmd.Dir = options.WorkingFolder
// Set owner for the process
if options.Owner != nil {
p.cmd.SysProcAttr = &syscall.SysProcAttr{
Credential: &syscall.Credential{
Uid: options.Owner.uid,
Gid: options.Owner.gid,
},
}
}
// Start the process
var err error
if !options.TTY {
p.cmd.Stdin = options.Stdin
p.cmd.Stdout = options.Stdout
p.cmd.Stderr = options.Stderr
p.stdin = options.Stdin
p.stdout = options.Stdout
p.stderr = options.Stderr
err = p.cmd.Start()
} else {
p.pty, err = pty.Start(p.cmd)
if options.Stdin != nil {
p.sockets.Add(1)
go func() {
io.Copy(p.pty, options.Stdin)
p.sockets.Done()
// Kill process when stdin ends (if running as TTY)
p.Kill()
}()
}
p.sockets.Add(1)
go func() {
ioext.CopyAndClose(options.Stdout, p.pty)
p.sockets.Done()
}()
}
if err != nil {
return nil, fmt.Errorf("Unable to execute binary, error: %s", err)
}
// Go wait for result
go p.waitForResult()
return p, nil
}