@@ -19,7 +19,7 @@ func (cli *DockerCli) CmdLogs(args ...string) error {

 	follow := cmd.Bool([]string{"f", "-follow"}, false, "Follow log output")

 	since := cmd.String([]string{"-since"}, "", "Show logs since timestamp")

 	times := cmd.Bool([]string{"t", "-timestamps"}, false, "Show timestamps")

-	tail := cmd.String([]string{"-tail"}, "latest", "Number of lines to show from the end of the logs")

+	tail := cmd.String([]string{"-tail"}, "all", "Number of lines to show from the end of the logs")

 	cmd.Require(flag.Exact, 1)

 	cmd.ParseFlags(args, true)

@@ -629,6 +629,17 @@ func (s *Server) getContainersLogs(version version.Version, w http.ResponseWrite

 		closeNotifier = notifier.CloseNotify()

 	}

+	c, err := s.daemon.Get(vars["name"])

+	if err != nil {

+		return err

+	}

+

+	outStream := ioutils.NewWriteFlusher(w)

+	// write an empty chunk of data (this is to ensure that the

+	// HTTP Response is sent immediatly, even if the container has

+	// not yet produced any data)

+	outStream.Write(nil)

+

 	logsConfig := &daemon.ContainerLogsConfig{

 		Follow:     boolValue(r, "follow"),

 		Timestamps: boolValue(r, "timestamps"),

@@ -636,11 +647,11 @@ func (s *Server) getContainersLogs(version version.Version, w http.ResponseWrite

 		Tail:       r.Form.Get("tail"),

 		UseStdout:  stdout,

 		UseStderr:  stderr,

-		OutStream:  ioutils.NewWriteFlusher(w),

+		OutStream:  outStream,

 		Stop:       closeNotifier,

 	}

-	if err := s.daemon.ContainerLogs(vars["name"], logsConfig); err != nil {

+	if err := s.daemon.ContainerLogs(c, logsConfig); err != nil {

 		fmt.Fprintf(w, "Error running logs job: %s\n", err)

 	}

@@ -25,7 +25,6 @@ import (

 	"github.com/docker/docker/pkg/broadcastwriter"

 	"github.com/docker/docker/pkg/fileutils"

 	"github.com/docker/docker/pkg/ioutils"

-	"github.com/docker/docker/pkg/jsonlog"

 	"github.com/docker/docker/pkg/mount"

 	"github.com/docker/docker/pkg/nat"

 	"github.com/docker/docker/pkg/promise"

@@ -721,6 +720,9 @@ func (container *Container) getLogConfig() runconfig.LogConfig {

 }

 func (container *Container) getLogger() (logger.Logger, error) {

+	if container.logDriver != nil && container.IsRunning() {

+		return container.logDriver, nil

+	}

 	cfg := container.getLogConfig()

 	if err := logger.ValidateLogOpts(cfg.Type, cfg.Config); err != nil {

 		return nil, err

@@ -894,36 +896,33 @@ func (c *Container) Attach(stdin io.ReadCloser, stdout io.Writer, stderr io.Writ

 }

 func (c *Container) AttachWithLogs(stdin io.ReadCloser, stdout, stderr io.Writer, logs, stream bool) error {

-

 	if logs {

 		logDriver, err := c.getLogger()

 		if err != nil {

-			logrus.Errorf("Error obtaining the logger %v", err)

 			return err

 		}

-		if _, ok := logDriver.(logger.Reader); !ok {

-			logrus.Errorf("cannot read logs for [%s] driver", logDriver.Name())

-		} else {

-			if cLog, err := logDriver.(logger.Reader).ReadLog(); err != nil {

-				logrus.Errorf("Error reading logs %v", err)

-			} else {

-				dec := json.NewDecoder(cLog)

-				for {

-					l := &jsonlog.JSONLog{}

-

-					if err := dec.Decode(l); err == io.EOF {

-						break

-					} else if err != nil {

-						logrus.Errorf("Error streaming logs: %s", err)

-						break

-					}

-					if l.Stream == "stdout" && stdout != nil {

-						io.WriteString(stdout, l.Log)

-					}

-					if l.Stream == "stderr" && stderr != nil {

-						io.WriteString(stderr, l.Log)

-					}

+		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

 			}

 		}

 	}

@@ -27,6 +27,7 @@ type Context struct {

 	LogPath             string

 }

+// Hostname returns the hostname from the underlying OS

 func (ctx *Context) Hostname() (string, error) {

 	hostname, err := os.Hostname()

 	if err != nil {

@@ -35,6 +36,7 @@ func (ctx *Context) Hostname() (string, error) {

 	return hostname, nil

 }

+// Command returns the command that the container being logged was started with

 func (ctx *Context) Command() string {

 	terms := []string{ctx.ContainerEntrypoint}

 	for _, arg := range ctx.ContainerArgs {

@@ -2,32 +2,42 @@ package jsonfilelog

 import (

 	"bytes"

+	"encoding/json"

 	"fmt"

 	"io"

 	"os"

 	"strconv"

 	"sync"

+	"time"

+

+	"gopkg.in/fsnotify.v1"

 	"github.com/Sirupsen/logrus"

 	"github.com/docker/docker/daemon/logger"

+	"github.com/docker/docker/pkg/ioutils"

 	"github.com/docker/docker/pkg/jsonlog"

+	"github.com/docker/docker/pkg/pubsub"

+	"github.com/docker/docker/pkg/tailfile"

 	"github.com/docker/docker/pkg/timeutils"

 	"github.com/docker/docker/pkg/units"

 )

 const (

-	Name = "json-file"

+	Name               = "json-file"

+	maxJSONDecodeRetry = 10

 )

 // JSONFileLogger is Logger implementation for default docker logging:

 // JSON objects to file

 type JSONFileLogger struct {

-	buf      *bytes.Buffer

-	f        *os.File   // store for closing

-	mu       sync.Mutex // protects buffer

-	capacity int64      //maximum size of each file

-	n        int        //maximum number of files

-	ctx      logger.Context

+	buf          *bytes.Buffer

+	f            *os.File   // store for closing

+	mu           sync.Mutex // protects buffer

+	capacity     int64      //maximum size of each file

+	n            int        //maximum number of files

+	ctx          logger.Context

+	readers      map[*logger.LogWatcher]struct{} // stores the active log followers

+	notifyRotate *pubsub.Publisher

 }

 func init() {

@@ -64,11 +74,13 @@ func New(ctx logger.Context) (logger.Logger, error) {

 		}

 	}

 	return &JSONFileLogger{

-		f:        log,

-		buf:      bytes.NewBuffer(nil),

-		ctx:      ctx,

-		capacity: capval,

-		n:        maxFiles,

+		f:            log,

+		buf:          bytes.NewBuffer(nil),

+		ctx:          ctx,

+		capacity:     capval,

+		n:            maxFiles,

+		readers:      make(map[*logger.LogWatcher]struct{}),

+		notifyRotate: pubsub.NewPublisher(0, 1),

 	}, nil

 }

@@ -111,6 +123,7 @@ func writeLog(l *JSONFileLogger) (int64, error) {

 			return -1, err

 		}

 		l.f = file

+		l.notifyRotate.Publish(struct{}{})

 	}

 	return writeToBuf(l)

 }

@@ -148,11 +161,11 @@ func backup(old, curr string) error {

 		}

 	}

 	if _, err := os.Stat(curr); os.IsNotExist(err) {

-		if f, err := os.Create(curr); err != nil {

+		f, err := os.Create(curr)

+		if err != nil {

 			return err

-		} else {

-			f.Close()

 		}

+		f.Close()

 	}

 	return os.Rename(curr, old)

 }

@@ -169,31 +182,200 @@ func ValidateLogOpt(cfg map[string]string) error {

 	return nil

 }

-func (l *JSONFileLogger) ReadLog(args ...string) (io.Reader, error) {

-	pth := l.ctx.LogPath

-	if len(args) > 0 {

-		//check if args[0] is an integer index

-		index, err := strconv.ParseInt(args[0], 0, 0)

-		if err != nil {

-			return nil, err

-		}

-		if index > 0 {

-			pth = pth + "." + args[0]

-		}

-	}

-	return os.Open(pth)

-}

-

 func (l *JSONFileLogger) LogPath() string {

 	return l.ctx.LogPath

 }

-// Close closes underlying file

+// Close closes underlying file and signals all readers to stop

 func (l *JSONFileLogger) Close() error {

-	return l.f.Close()

+	l.mu.Lock()

+	err := l.f.Close()

+	for r := range l.readers {

+		r.Close()

+		delete(l.readers, r)

+	}

+	l.mu.Unlock()

+	return err

 }

 // Name returns name of this logger

 func (l *JSONFileLogger) Name() string {

 	return Name

 }

+

+func decodeLogLine(dec *json.Decoder, l *jsonlog.JSONLog) (*logger.Message, error) {

+	l.Reset()

+	if err := dec.Decode(l); err != nil {

+		return nil, err

+	}

+	msg := &logger.Message{

+		Source:    l.Stream,

+		Timestamp: l.Created,

+		Line:      []byte(l.Log),

+	}

+	return msg, nil

+}

+

+// Reads from the log file

+func (l *JSONFileLogger) ReadLogs(config logger.ReadConfig) *logger.LogWatcher {

+	logWatcher := logger.NewLogWatcher()

+

+	go l.readLogs(logWatcher, config)

+	return logWatcher

+}

+

+func (l *JSONFileLogger) readLogs(logWatcher *logger.LogWatcher, config logger.ReadConfig) {

+	defer close(logWatcher.Msg)

+

+	pth := l.ctx.LogPath

+	var files []io.ReadSeeker

+	for i := l.n; i > 1; i-- {

+		f, err := os.Open(fmt.Sprintf("%s.%d", pth, i-1))

+		if err != nil {

+			if !os.IsNotExist(err) {

+				logWatcher.Err <- err

+				break

+			}

+			continue

+		}

+		defer f.Close()

+		files = append(files, f)

+	}

+

+	latestFile, err := os.Open(pth)

+	if err != nil {

+		logWatcher.Err <- err

+		return

+	}

+	defer latestFile.Close()

+

+	files = append(files, latestFile)

+	tailer := ioutils.MultiReadSeeker(files...)

+

+	if config.Tail != 0 {

+		tailFile(tailer, logWatcher, config.Tail, config.Since)

+	}

+

+	if !config.Follow {

+		return

+	}

+	if config.Tail == 0 {

+		latestFile.Seek(0, os.SEEK_END)

+	}

+

+	l.mu.Lock()

+	l.readers[logWatcher] = struct{}{}

+	l.mu.Unlock()

+

+	notifyRotate := l.notifyRotate.Subscribe()

+	followLogs(latestFile, logWatcher, notifyRotate, config.Since)

+

+	l.mu.Lock()

+	delete(l.readers, logWatcher)

+	l.mu.Unlock()

+

+	l.notifyRotate.Evict(notifyRotate)

+}

+

+func tailFile(f io.ReadSeeker, logWatcher *logger.LogWatcher, tail int, since time.Time) {

+	var rdr io.Reader = f

+	if tail > 0 {

+		ls, err := tailfile.TailFile(f, tail)

+		if err != nil {

+			logWatcher.Err <- err

+			return

+		}

+		rdr = bytes.NewBuffer(bytes.Join(ls, []byte("\n")))

+	}

+	dec := json.NewDecoder(rdr)

+	l := &jsonlog.JSONLog{}

+	for {

+		msg, err := decodeLogLine(dec, l)

+		if err != nil {

+			if err != io.EOF {

+				logWatcher.Err <- err

+			}

+			return

+		}

+		if !since.IsZero() && msg.Timestamp.Before(since) {

+			continue

+		}

+		logWatcher.Msg <- msg

+	}

+}

+

+func followLogs(f *os.File, logWatcher *logger.LogWatcher, notifyRotate chan interface{}, since time.Time) {

+	dec := json.NewDecoder(f)

+	l := &jsonlog.JSONLog{}

+	fileWatcher, err := fsnotify.NewWatcher()

+	if err != nil {

+		logWatcher.Err <- err

+		return

+	}

+	defer fileWatcher.Close()

+	if err := fileWatcher.Add(f.Name()); err != nil {

+		logWatcher.Err <- err

+		return

+	}

+

+	var retries int

+	for {

+		msg, err := decodeLogLine(dec, l)

+		if err != nil {

+			if err != io.EOF {

+				// try again because this shouldn't happen

+				if _, ok := err.(*json.SyntaxError); ok && retries <= maxJSONDecodeRetry {

+					dec = json.NewDecoder(f)

+					retries += 1

+					continue

+				}

+				logWatcher.Err <- err

+				return

+			}

+

+			select {

+			case <-fileWatcher.Events:

+				dec = json.NewDecoder(f)

+				continue

+			case <-fileWatcher.Errors:

+				logWatcher.Err <- err

+				return

+			case <-logWatcher.WatchClose():

+				return

+			case <-notifyRotate:

+				fileWatcher.Remove(f.Name())

+

+				f, err = os.Open(f.Name())

+				if err != nil {

+					logWatcher.Err <- err

+					return

+				}

+				if err := fileWatcher.Add(f.Name()); err != nil {

+					logWatcher.Err <- err

+				}

+				dec = json.NewDecoder(f)

+				continue

+			}

+		}

+

+		retries = 0 // reset retries since we've succeeded

+		if !since.IsZero() && msg.Timestamp.Before(since) {

+			continue

+		}

+		select {

+		case logWatcher.Msg <- msg:

+		case <-logWatcher.WatchClose():

+			logWatcher.Msg <- msg

+			for {

+				msg, err := decodeLogLine(dec, l)

+				if err != nil {

+					return

+				}

+				if !since.IsZero() && msg.Timestamp.Before(since) {

+					continue

+				}

+				logWatcher.Msg <- msg

+			}

+		}

+	}

+}

@@ -2,11 +2,19 @@ package logger

 import (

 	"errors"

-	"io"

 	"time"

+

+	"github.com/docker/docker/pkg/timeutils"

 )

-var ReadLogsNotSupported = errors.New("configured logging reader does not support reading")

+// ErrReadLogsNotSupported is returned when the logger does not support reading logs

+var ErrReadLogsNotSupported = errors.New("configured logging reader does not support reading")

+

+const (

+	// TimeFormat is the time format used for timestamps sent to log readers

+	TimeFormat           = timeutils.RFC3339NanoFixed

+	logWatcherBufferSize = 4096

+)

 // Message is datastructure that represents record from some container

 type Message struct {

@@ -16,14 +24,51 @@ type Message struct {

 	Timestamp   time.Time

 }

-// Logger is interface for docker logging drivers

+// Logger is the interface for docker logging drivers

 type Logger interface {

 	Log(*Message) error

 	Name() string

 	Close() error

 }

-//Reader is an interface for docker logging drivers that support reading

-type Reader interface {

-	ReadLog(args ...string) (io.Reader, error)

+// ReadConfig is the configuration passed into ReadLogs

+type ReadConfig struct {

+	Since  time.Time

+	Tail   int

+	Follow bool

+}

+

+// LogReader is the interface for reading log messages for loggers that support reading

+type LogReader interface {

+	// Read logs from underlying logging backend

+	ReadLogs(ReadConfig) *LogWatcher

+}

+

+// LogWatcher is used when consuming logs read from the LogReader interface

+type LogWatcher struct {

+	// For sending log messages to a reader

+	Msg chan *Message

+	// For sending error messages that occur while while reading logs

+	Err           chan error

+	closeNotifier chan struct{}

+}

+

+// NewLogWatcher returns a new LogWatcher.

+func NewLogWatcher() *LogWatcher {

+	return &LogWatcher{

+		Msg:           make(chan *Message, logWatcherBufferSize),

+		Err:           make(chan error, 1),

+		closeNotifier: make(chan struct{}),

+	}

+}

+

+// Close notifies the underlying log reader to stop

+func (w *LogWatcher) Close() {

+	close(w.closeNotifier)

+}

+

+// WatchClose returns a channel receiver that receives notification when the watcher has been closed

+// This should only be called from one goroutine

+func (w *LogWatcher) WatchClose() <-chan struct{} {

+	return w.closeNotifier

 }

@@ -1,23 +1,14 @@

 package daemon

 import (

-	"bytes"

-	"encoding/json"

 	"fmt"

 	"io"

-	"net"

-	"os"

 	"strconv"

-	"syscall"

 	"time"

 	"github.com/Sirupsen/logrus"

 	"github.com/docker/docker/daemon/logger"

-	"github.com/docker/docker/daemon/logger/jsonfilelog"

-	"github.com/docker/docker/pkg/jsonlog"

 	"github.com/docker/docker/pkg/stdcopy"

-	"github.com/docker/docker/pkg/tailfile"

-	"github.com/docker/docker/pkg/timeutils"

 )

 type ContainerLogsConfig struct {

@@ -29,209 +20,64 @@ type ContainerLogsConfig struct {

 	Stop                 <-chan bool

 }

-func (daemon *Daemon) ContainerLogs(name string, config *ContainerLogsConfig) error {

-	var (

-		lines  = -1

-		format string

-	)

+func (daemon *Daemon) ContainerLogs(container *Container, config *ContainerLogsConfig) error {

 	if !(config.UseStdout || config.UseStderr) {

 		return fmt.Errorf("You must choose at least one stream")

 	}

-	if config.Timestamps {

-		format = timeutils.RFC3339NanoFixed

-	}

-	if config.Tail == "" {

-		config.Tail = "latest"

-	}

-

-	container, err := daemon.Get(name)

-	if err != nil {

-		return err

-	}

-	var (

-		outStream = config.OutStream

-		errStream io.Writer

-	)

+	outStream := config.OutStream

+	errStream := outStream

 	if !container.Config.Tty {

 		errStream = stdcopy.NewStdWriter(outStream, stdcopy.Stderr)

 		outStream = stdcopy.NewStdWriter(outStream, stdcopy.Stdout)

-	} else {

-		errStream = outStream

-	}

-

-	if container.LogDriverType() != jsonfilelog.Name {

-		return fmt.Errorf("\"logs\" endpoint is supported only for \"json-file\" logging driver")

-	}

-

-	maxFile := 1

-	container.readHostConfig()

-	cfg := container.getLogConfig()

-	conf := cfg.Config

-	if val, ok := conf["max-file"]; ok {

-		var err error

-		maxFile, err = strconv.Atoi(val)

-		if err != nil {

-			return fmt.Errorf("Error reading max-file value: %s", err)

-		}

 	}

-	logDriver, err := container.getLogger()

+	cLog, err := container.getLogger()

 	if err != nil {

 		return err

 	}

-	_, ok := logDriver.(logger.Reader)

+	logReader, ok := cLog.(logger.LogReader)

 	if !ok {

-		logrus.Errorf("Cannot read logs of the [%s] driver", logDriver.Name())

-	} else {

-		// json-file driver

-		if config.Tail != "all" && config.Tail != "latest" {

-			var err error

-			lines, err = strconv.Atoi(config.Tail)

-			if err != nil {

-				logrus.Errorf("Failed to parse tail %s, error: %v, show all logs", config.Tail, err)

-				lines = -1

-			}

-		}

-

-		if lines != 0 {

-			n := maxFile

-			if config.Tail == "latest" && config.Since.IsZero() {

-				n = 1

-			}

-			before := false

-			for i := n; i > 0; i-- {

-				if before {

-					break

-				}

-				cLog, err := getReader(logDriver, i, n, lines)

-				if err != nil {

-					logrus.Debugf("Error reading %d log file: %v", i-1, err)

-					continue

-				}

-				//if lines are specified, then iterate only once

-				if lines > 0 {

-					i = 1

-				} else { // if lines are not specified, cLog is a file, It needs to be closed

-					defer cLog.(*os.File).Close()

-				}

-				dec := json.NewDecoder(cLog)

-				l := &jsonlog.JSONLog{}

-				for {

-					l.Reset()

-					if err := dec.Decode(l); err == io.EOF {

-						break

-					} else if err != nil {

-						logrus.Errorf("Error streaming logs: %s", err)

-						break

-					}

-					logLine := l.Log

-					if !config.Since.IsZero() && l.Created.Before(config.Since) {

-						continue

-					}

-					if config.Timestamps {

-						// format can be "" or time format, so here can't be error

-						logLine, _ = l.Format(format)

-					}

-					if l.Stream == "stdout" && config.UseStdout {

-						io.WriteString(outStream, logLine)

-					}

-					if l.Stream == "stderr" && config.UseStderr {

-						io.WriteString(errStream, logLine)

-					}

-				}

-			}

-		}

+		return logger.ErrReadLogsNotSupported

 	}

-	if config.Follow && container.IsRunning() {

-		chErrStderr := make(chan error)

-		chErrStdout := make(chan error)

-		var stdoutPipe, stderrPipe io.ReadCloser

-

-		// write an empty chunk of data (this is to ensure that the

-		// HTTP Response is sent immediatly, even if the container has

-		// not yet produced any data)

-		outStream.Write(nil)

+	follow := config.Follow && container.IsRunning()

+	tailLines, err := strconv.Atoi(config.Tail)

+	if err != nil {

+		tailLines = -1

+	}

-		if config.UseStdout {

-			stdoutPipe = container.StdoutLogPipe()

-			go func() {

-				logrus.Debug("logs: stdout stream begin")

-				chErrStdout <- jsonlog.WriteLog(stdoutPipe, outStream, format, config.Since)

-				logrus.Debug("logs: stdout stream end")

-			}()

-		}

-		if config.UseStderr {

-			stderrPipe = container.StderrLogPipe()

-			go func() {

-				logrus.Debug("logs: stderr stream begin")

-				chErrStderr <- jsonlog.WriteLog(stderrPipe, errStream, format, config.Since)

-				logrus.Debug("logs: stderr stream end")

-			}()

-		}

+	logrus.Debug("logs: begin stream")

+	readConfig := logger.ReadConfig{

+		Since:  config.Since,

+		Tail:   tailLines,

+		Follow: follow,

+	}

+	logs := logReader.ReadLogs(readConfig)

+	for {

 		select {

-		case err = <-chErrStderr:

-			if stdoutPipe != nil {

-				stdoutPipe.Close()

-				<-chErrStdout

-			}

-		case err = <-chErrStdout:

-			if stderrPipe != nil {

-				stderrPipe.Close()

-				<-chErrStderr

-			}

+		case err := <-logs.Err:

+			logrus.Errorf("Error streaming logs: %v", err)

+			return nil

 		case <-config.Stop:

-			if stdoutPipe != nil {

-				stdoutPipe.Close()

-				<-chErrStdout

+			logs.Close()

+			return nil

+		case msg, ok := <-logs.Msg:

+			if !ok {

+				logrus.Debugf("logs: end stream")

+				return nil

 			}

-			if stderrPipe != nil {

-				stderrPipe.Close()

-				<-chErrStderr

+			logLine := msg.Line

+			if config.Timestamps {

+				logLine = append([]byte(msg.Timestamp.Format(logger.TimeFormat)+" "), logLine...)

 			}

-			return nil

-		}

-

-		if err != nil && err != io.EOF && err != io.ErrClosedPipe {

-			if e, ok := err.(*net.OpError); ok && e.Err != syscall.EPIPE {

-				logrus.Errorf("error streaming logs: %v", err)

+			if msg.Source == "stdout" && config.UseStdout {

+				outStream.Write(logLine)

+			}

+			if msg.Source == "stderr" && config.UseStderr {

+				errStream.Write(logLine)

 			}

 		}

 	}

-	return nil

-}

-

-func getReader(logDriver logger.Logger, fileIndex, maxFiles, lines int) (io.Reader, error) {

-	if lines <= 0 {

-		index := strconv.Itoa(fileIndex - 1)

-		cLog, err := logDriver.(logger.Reader).ReadLog(index)

-		return cLog, err

-	}

-	buf := bytes.NewBuffer([]byte{})

-	remaining := lines

-	for i := 0; i < maxFiles; i++ {

-		index := strconv.Itoa(i)

-		cLog, err := logDriver.(logger.Reader).ReadLog(index)

-		if err != nil {

-			return buf, err

-		}

-		f := cLog.(*os.File)

-		ls, err := tailfile.TailFile(f, remaining)

-		if err != nil {

-			return buf, err

-		}

-		tmp := bytes.NewBuffer([]byte{})

-		for _, l := range ls {

-			fmt.Fprintf(tmp, "%s\n", l)

-		}

-		tmp.ReadFrom(buf)

-		buf = tmp

-		if len(ls) == remaining {

-			return buf, nil

-		}

-		remaining = remaining - len(ls)

-	}

-	return buf, nil

 }

@@ -12,7 +12,10 @@ import (

 	"github.com/docker/docker/runconfig"

 )

-const defaultTimeIncrement = 100

+const (

+	defaultTimeIncrement = 100

+	loggerCloseTimeout   = 10 * time.Second

+)

 // containerMonitor monitors the execution of a container's main process.

 // If a restart policy is specified for the container the monitor will ensure that the

@@ -310,7 +313,7 @@ func (m *containerMonitor) resetContainer(lock bool) {

 				close(exit)

 			}()

 			select {

-			case <-time.After(1 * time.Second):

+			case <-time.After(loggerCloseTimeout):

 				logrus.Warnf("Logger didn't exit in time: logs may be truncated")

 			case <-exit:

 			}

@@ -29,7 +29,7 @@ The `docker logs --follow` command will continue streaming the new output from

 the container's `STDOUT` and `STDERR`.

 Passing a negative number or a non-integer to `--tail` is invalid and the

-value is set to `latest` in that case.

+value is set to `all` in that case.

 The `docker logs --timestamp` commands will add an RFC3339Nano

 timestamp, for example `2014-09-16T06:17:46.000000000Z`, to each

@@ -250,13 +250,9 @@ func (s *DockerSuite) TestLogsFollowSlowStdoutConsumer(c *check.C) {

 	}()

 	logCmd := exec.Command(dockerBinary, "logs", "-f", cleanedContainerID)

-

 	stdout, err := logCmd.StdoutPipe()

 	c.Assert(err, check.IsNil)

-

-	if err := logCmd.Start(); err != nil {

-		c.Fatal(err)

-	}

+	c.Assert(logCmd.Start(), check.IsNil)

 	// First read slowly

 	bytes1, err := consumeWithSpeed(stdout, 10, 50*time.Millisecond, stopSlowRead)

new file mode 100644

@@ -0,0 +1,226 @@

+package ioutils

+

+import (

+	"bytes"

+	"fmt"

+	"io"

+	"os"

+)

+

+type pos struct {

+	idx    int

+	offset int64

+}

+

+type multiReadSeeker struct {

+	readers []io.ReadSeeker

+	pos     *pos

+	posIdx  map[io.ReadSeeker]int

+}

+

+func (r *multiReadSeeker) Seek(offset int64, whence int) (int64, error) {

+	var tmpOffset int64

+	switch whence {

+	case os.SEEK_SET:

+		for i, rdr := range r.readers {

+			// get size of the current reader

+			s, err := rdr.Seek(0, os.SEEK_END)

+			if err != nil {

+				return -1, err

+			}

+

+			if offset > tmpOffset+s {

+				if i == len(r.readers)-1 {