package daemon import ( "fmt" "io" "time" "github.com/Sirupsen/logrus" "github.com/docker/docker/api/types/backend" "github.com/docker/docker/container" "github.com/docker/docker/daemon/logger" "github.com/docker/docker/errors" "github.com/docker/docker/pkg/stdcopy" "github.com/docker/docker/pkg/term" ) // ContainerAttach attaches to logs according to the config passed in. See ContainerAttachConfig. func (daemon *Daemon) ContainerAttach(prefixOrName string, c *backend.ContainerAttachConfig) error { keys := []byte{} var err error if c.DetachKeys != "" { keys, err = term.ToBytes(c.DetachKeys) if err != nil { return fmt.Errorf("Invalid escape keys (%s) provided", c.DetachKeys) } } container, err := daemon.GetContainer(prefixOrName) if err != nil { return err } if container.IsPaused() { err := fmt.Errorf("Container %s is paused. Unpause the container before attach", prefixOrName) return errors.NewRequestConflictError(err) } inStream, outStream, errStream, err := c.GetStreams() if err != nil { return err } defer inStream.Close() if !container.Config.Tty && c.MuxStreams { errStream = stdcopy.NewStdWriter(errStream, stdcopy.Stderr) outStream = stdcopy.NewStdWriter(outStream, stdcopy.Stdout) } var stdin io.ReadCloser var stdout, stderr io.Writer if c.UseStdin { stdin = inStream } if c.UseStdout { stdout = outStream } if c.UseStderr { stderr = errStream } if err := daemon.containerAttach(container, stdin, stdout, stderr, c.Logs, c.Stream, keys); err != nil { fmt.Fprintf(outStream, "Error attaching: %s\n", err) } return nil } // ContainerAttachRaw attaches the provided streams to the container's stdio func (daemon *Daemon) ContainerAttachRaw(prefixOrName string, stdin io.ReadCloser, stdout, stderr io.Writer, stream bool) error { container, err := daemon.GetContainer(prefixOrName) if err != nil { return err } return daemon.containerAttach(container, stdin, stdout, stderr, false, stream, nil) } func (daemon *Daemon) containerAttach(c *container.Container, stdin io.ReadCloser, stdout, stderr io.Writer, logs, stream bool, keys []byte) error { if logs { logDriver, err := daemon.getLogger(c) if err != nil { return err } cLog, ok := logDriver.(logger.LogReader) if !ok { return logger.ErrReadLogsNotSupported } logs := cLog.ReadLogs(logger.ReadConfig{Tail: -1}) LogLoop: for { select { case msg, ok := <-logs.Msg: if !ok { break LogLoop } if msg.Source == "stdout" && stdout != nil { stdout.Write(msg.Line) } if msg.Source == "stderr" && stderr != nil { stderr.Write(msg.Line) } case err := <-logs.Err: logrus.Errorf("Error streaming logs: %v", err) break LogLoop } } } daemon.LogContainerEvent(c, "attach") //stream if stream { var stdinPipe io.ReadCloser if stdin != nil { r, w := io.Pipe() go func() { defer w.Close() defer logrus.Debug("Closing buffered stdin pipe") io.Copy(w, stdin) }() stdinPipe = r } waitChan := make(chan struct{}) if c.Config.StdinOnce && !c.Config.Tty { go func() { c.WaitStop(-1 * time.Second) close(waitChan) }() } err := <-c.Attach(stdinPipe, stdout, stderr, keys) if err != nil { if _, ok := err.(container.DetachError); ok { daemon.LogContainerEvent(c, "detach") } else { logrus.Errorf("attach failed with error: %v", err) } } // If we are in stdinonce mode, wait for the process to end // otherwise, simply return if c.Config.StdinOnce && !c.Config.Tty { <-waitChan } } return nil }