Merge pull request #14442 from cpuguy83/refactor_logdrvier_reader

Refactor log driver reader

api/client/logs.go

@@ -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)

api/server/server.go

@@ -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)
 	}
 

daemon/container.go

@@ -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"
@@ -325,25 +324,13 @@ func (streamConfig *StreamConfig) StdinPipe() io.WriteCloser {
 
 func (streamConfig *StreamConfig) StdoutPipe() io.ReadCloser {
 	reader, writer := io.Pipe()
-	streamConfig.stdout.AddWriter(writer, "")
+	streamConfig.stdout.AddWriter(writer)
 	return ioutils.NewBufReader(reader)
 }
 
 func (streamConfig *StreamConfig) StderrPipe() io.ReadCloser {
 	reader, writer := io.Pipe()
-	streamConfig.stderr.AddWriter(writer, "")
-	return ioutils.NewBufReader(reader)
-}
-
-func (streamConfig *StreamConfig) StdoutLogPipe() io.ReadCloser {
-	reader, writer := io.Pipe()
-	streamConfig.stdout.AddWriter(writer, "stdout")
-	return ioutils.NewBufReader(reader)
-}
-
-func (streamConfig *StreamConfig) StderrLogPipe() io.ReadCloser {
-	reader, writer := io.Pipe()
-	streamConfig.stderr.AddWriter(writer, "stderr")
+	streamConfig.stderr.AddWriter(writer)
 	return ioutils.NewBufReader(reader)
 }
 
@@ -715,6 +702,9 @@ 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
@@ -888,36 +878,33 @@ 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{}
+		cLog, ok := logDriver.(logger.LogReader)
+		if !ok {
+			return logger.ErrReadLogsNotSupported
+		}
+		logs := cLog.ReadLogs(logger.ReadConfig{Tail: -1})
 
-					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)
-					}
+	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/logger/factory.go

@@ -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 {

daemon/logger/jsonfilelog/jsonfilelog.go

@@ -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
+			}
+		}
+	}
+}

daemon/logger/logger.go

@@ -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
 }

daemon/logs.go

@@ -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
+	follow := config.Follow && container.IsRunning()
+	tailLines, err := strconv.Atoi(config.Tail)
+	if err != nil {
+		tailLines = -1
+	}
 
-		// 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)
-
-		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 <-config.Stop:
-			if stdoutPipe != nil {
-				stdoutPipe.Close()
-				<-chErrStdout
-			}
-			if stderrPipe != nil {
-				stderrPipe.Close()
-				<-chErrStderr
-			}
+		case err := <-logs.Err:
+			logrus.Errorf("Error streaming logs: %v", err)
 			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)
+		case <-config.Stop:
+			logs.Close()
+			return nil
+		case msg, ok := <-logs.Msg:
+			if !ok {
+				logrus.Debugf("logs: end stream")
+				return nil
+			}
+			logLine := msg.Line
+			if config.Timestamps {
+				logLine = append([]byte(msg.Timestamp.Format(logger.TimeFormat)+" "), logLine...)
+			}
+			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
 }

daemon/monitor.go

@@ -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:
 			}

docs/reference/commandline/logs.md

@@ -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

hack/vendor.sh

@@ -50,4 +50,7 @@ clone git github.com/fluent/fluent-logger-golang v1.0.0
 clone git github.com/philhofer/fwd 899e4efba8eaa1fea74175308f3fae18ff3319fa
 clone git github.com/tinylib/msgp 75ee40d2601edf122ef667e2a07d600d4c44490c
 
+# fsnotify
+clone git gopkg.in/fsnotify.v1 v1.2.0
+
 clean

integration-cli/docker_cli_logs_test.go

@@ -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)

pkg/broadcastwriter/broadcastwriter.go

@@ -1,33 +1,20 @@
 package broadcastwriter
 
 import (
-	"bytes"
 	"io"
 	"sync"
-	"time"
-
-	"github.com/Sirupsen/logrus"
-	"github.com/docker/docker/pkg/jsonlog"
-	"github.com/docker/docker/pkg/timeutils"
 )
 
 // BroadcastWriter accumulate multiple io.WriteCloser by stream.
 type BroadcastWriter struct {
 	sync.Mutex
-	buf      *bytes.Buffer
-	jsLogBuf *bytes.Buffer
-	streams  map[string](map[io.WriteCloser]struct{})
+	writers map[io.WriteCloser]struct{}
 }
 
-// AddWriter adds new io.WriteCloser for stream.
-// If stream is "", then all writes proceed as is. Otherwise every line from
-// input will be packed to serialized jsonlog.JSONLog.
-func (w *BroadcastWriter) AddWriter(writer io.WriteCloser, stream string) {
+// AddWriter adds new io.WriteCloser.
+func (w *BroadcastWriter) AddWriter(writer io.WriteCloser) {
 	w.Lock()
-	if _, ok := w.streams[stream]; !ok {
-		w.streams[stream] = make(map[io.WriteCloser]struct{})
-	}
-	w.streams[stream][writer] = struct{}{}
+	w.writers[writer] = struct{}{}
 	w.Unlock()
 }
 
@@ -35,67 +22,12 @@ func (w *BroadcastWriter) AddWriter(writer io.WriteCloser, stream string) {
 // this call.
 func (w *BroadcastWriter) Write(p []byte) (n int, err error) {
 	w.Lock()
-	if writers, ok := w.streams[""]; ok {
-		for sw := range writers {
-			if n, err := sw.Write(p); err != nil || n != len(p) {
-				// On error, evict the writer
-				delete(writers, sw)
-			}
-		}
-		if len(w.streams) == 1 {
-			if w.buf.Len() >= 4096 {
-				w.buf.Reset()
-			} else {
-				w.buf.Write(p)
-			}
-			w.Unlock()
-			return len(p), nil
+	for sw := range w.writers {
+		if n, err := sw.Write(p); err != nil || n != len(p) {
+			// On error, evict the writer
+			delete(w.writers, sw)
 		}
 	}
-	if w.jsLogBuf == nil {
-		w.jsLogBuf = new(bytes.Buffer)
-		w.jsLogBuf.Grow(1024)
-	}
-	var timestamp string
-	created := time.Now().UTC()
-	w.buf.Write(p)
-	for {
-		if n := w.buf.Len(); n == 0 {
-			break
-		}
-		i := bytes.IndexByte(w.buf.Bytes(), '\n')
-		if i < 0 {
-			break
-		}
-		lineBytes := w.buf.Next(i + 1)
-		if timestamp == "" {
-			timestamp, err = timeutils.FastMarshalJSON(created)
-			if err != nil {
-				continue
-			}
-		}
-
-		for stream, writers := range w.streams {
-			if stream == "" {
-				continue
-			}
-			jsonLog := jsonlog.JSONLogBytes{Log: lineBytes, Stream: stream, Created: timestamp}
-			err = jsonLog.MarshalJSONBuf(w.jsLogBuf)
-			if err != nil {
-				logrus.Errorf("Error making JSON log line: %s", err)
-				continue
-			}
-			w.jsLogBuf.WriteByte('\n')
-			b := w.jsLogBuf.Bytes()
-			for sw := range writers {
-				if _, err := sw.Write(b); err != nil {
-					delete(writers, sw)
-				}
-			}
-		}
-		w.jsLogBuf.Reset()
-	}
-	w.jsLogBuf.Reset()
 	w.Unlock()
 	return len(p), nil
 }
@@ -104,19 +36,16 @@ func (w *BroadcastWriter) Write(p []byte) (n int, err error) {
 // will be saved.
 func (w *BroadcastWriter) Clean() error {
 	w.Lock()
-	for _, writers := range w.streams {
-		for w := range writers {
-			w.Close()
-		}
+	for w := range w.writers {
+		w.Close()
 	}
-	w.streams = make(map[string](map[io.WriteCloser]struct{}))
+	w.writers = make(map[io.WriteCloser]struct{})
 	w.Unlock()
 	return nil
 }
 
 func New() *BroadcastWriter {
 	return &BroadcastWriter{
-		streams: make(map[string](map[io.WriteCloser]struct{})),
-		buf:     bytes.NewBuffer(nil),
+		writers: make(map[io.WriteCloser]struct{}),
 	}
 }

pkg/broadcastwriter/broadcastwriter_test.go

@@ -32,9 +32,9 @@ func TestBroadcastWriter(t *testing.T) {
 
 	// Test 1: Both bufferA and bufferB should contain "foo"
 	bufferA := &dummyWriter{}
-	writer.AddWriter(bufferA, "")
+	writer.AddWriter(bufferA)
 	bufferB := &dummyWriter{}
-	writer.AddWriter(bufferB, "")
+	writer.AddWriter(bufferB)
 	writer.Write([]byte("foo"))
 
 	if bufferA.String() != "foo" {
@@ -48,7 +48,7 @@ func TestBroadcastWriter(t *testing.T) {
 	// Test2: bufferA and bufferB should contain "foobar",
 	// while bufferC should only contain "bar"
 	bufferC := &dummyWriter{}
-	writer.AddWriter(bufferC, "")
+	writer.AddWriter(bufferC)
 	writer.Write([]byte("bar"))
 
 	if bufferA.String() != "foobar" {
@@ -100,7 +100,7 @@ func TestRaceBroadcastWriter(t *testing.T) {
 	writer := New()
 	c := make(chan bool)
 	go func() {
-		writer.AddWriter(devNullCloser(0), "")
+		writer.AddWriter(devNullCloser(0))
 		c <- true
 	}()
 	writer.Write([]byte("hello"))
@@ -111,9 +111,9 @@ func BenchmarkBroadcastWriter(b *testing.B) {
 	writer := New()
 	setUpWriter := func() {
 		for i := 0; i < 100; i++ {
-			writer.AddWriter(devNullCloser(0), "stdout")
-			writer.AddWriter(devNullCloser(0), "stderr")
-			writer.AddWriter(devNullCloser(0), "")
+			writer.AddWriter(devNullCloser(0))
+			writer.AddWriter(devNullCloser(0))
+			writer.AddWriter(devNullCloser(0))
 		}
 	}
 	testLine := "Line that thinks that it is log line from docker"
@@ -142,33 +142,3 @@ func BenchmarkBroadcastWriter(b *testing.B) {
 		b.StartTimer()
 	}
 }
-
-func BenchmarkBroadcastWriterWithoutStdoutStderr(b *testing.B) {
-	writer := New()
-	setUpWriter := func() {
-		for i := 0; i < 100; i++ {
-			writer.AddWriter(devNullCloser(0), "")
-		}
-	}
-	testLine := "Line that thinks that it is log line from docker"
-	var buf bytes.Buffer
-	for i := 0; i < 100; i++ {
-		buf.Write([]byte(testLine + "\n"))
-	}
-	// line without eol
-	buf.Write([]byte(testLine))
-	testText := buf.Bytes()
-	b.SetBytes(int64(5 * len(testText)))
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		setUpWriter()
-
-		for j := 0; j < 5; j++ {
-			if _, err := writer.Write(testText); err != nil {
-				b.Fatal(err)
-			}
-		}
-
-		writer.Clean()
-	}
-}

pkg/ioutils/multireader.go

@@ -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 {
+					rdrOffset := s + (offset - tmpOffset)
+					if _, err := rdr.Seek(rdrOffset, os.SEEK_SET); err != nil {
+						return -1, err
+					}
+					r.pos = &pos{i, rdrOffset}
+					return offset, nil
+				}
+
+				tmpOffset += s
+				continue
+			}
+
+			rdrOffset := offset - tmpOffset
+			idx := i
+
+			rdr.Seek(rdrOffset, os.SEEK_SET)
+			// make sure all following readers are at 0
+			for _, rdr := range r.readers[i+1:] {
+				rdr.Seek(0, os.SEEK_SET)
+			}
+
+			if rdrOffset == s && i != len(r.readers)-1 {
+				idx += 1
+				rdrOffset = 0
+			}
+			r.pos = &pos{idx, rdrOffset}
+			return offset, nil
+		}
+	case os.SEEK_END:
+		for _, rdr := range r.readers {
+			s, err := rdr.Seek(0, os.SEEK_END)
+			if err != nil {
+				return -1, err
+			}
+			tmpOffset += s
+		}
+		r.Seek(tmpOffset+offset, os.SEEK_SET)
+		return tmpOffset + offset, nil
+	case os.SEEK_CUR:
+		if r.pos == nil {
+			return r.Seek(offset, os.SEEK_SET)
+		}
+		// Just return the current offset
+		if offset == 0 {
+			return r.getCurOffset()
+		}
+
+		curOffset, err := r.getCurOffset()
+		if err != nil {
+			return -1, err
+		}
+		rdr, rdrOffset, err := r.getReaderForOffset(curOffset + offset)
+		if err != nil {
+			return -1, err
+		}
+
+		r.pos = &pos{r.posIdx[rdr], rdrOffset}
+		return curOffset + offset, nil
+	default:
+		return -1, fmt.Errorf("Invalid whence: %d", whence)
+	}
+
+	return -1, fmt.Errorf("Error seeking for whence: %d, offset: %d", whence, offset)
+}
+
+func (r *multiReadSeeker) getReaderForOffset(offset int64) (io.ReadSeeker, int64, error) {
+	var rdr io.ReadSeeker
+	var rdrOffset int64
+
+	for i, rdr := range r.readers {
+		offsetTo, err := r.getOffsetToReader(rdr)
+		if err != nil {
+			return nil, -1, err
+		}
+		if offsetTo > offset {
+			rdr = r.readers[i-1]
+			rdrOffset = offsetTo - offset
+			break
+		}
+
+		if rdr == r.readers[len(r.readers)-1] {
+			rdrOffset = offsetTo + offset
+			break
+		}
+	}
+
+	return rdr, rdrOffset, nil
+}
+
+func (r *multiReadSeeker) getCurOffset() (int64, error) {
+	var totalSize int64
+	for _, rdr := range r.readers[:r.pos.idx+1] {
+		if r.posIdx[rdr] == r.pos.idx {
+			totalSize += r.pos.offset
+			break
+		}
+
+		size, err := getReadSeekerSize(rdr)
+		if err != nil {
+			return -1, fmt.Errorf("error getting seeker size: %v", err)
+		}
+		totalSize += size
+	}
+	return totalSize, nil
+}
+
+func (r *multiReadSeeker) getOffsetToReader(rdr io.ReadSeeker) (int64, error) {
+	var offset int64
+	for _, r := range r.readers {
+		if r == rdr {
+			break
+		}
+
+		size, err := getReadSeekerSize(rdr)
+		if err != nil {
+			return -1, err
+		}
+		offset += size
+	}
+	return offset, nil
+}
+
+func (r *multiReadSeeker) Read(b []byte) (int, error) {
+	if r.pos == nil {
+		r.pos = &pos{0, 0}
+	}
+
+	bCap := int64(cap(b))
+	buf := bytes.NewBuffer(nil)
+	var rdr io.ReadSeeker
+
+	for _, rdr = range r.readers[r.pos.idx:] {
+		readBytes, err := io.CopyN(buf, rdr, bCap)
+		if err != nil && err != io.EOF {
+			return -1, err
+		}
+		bCap -= readBytes
+
+		if bCap == 0 {
+			break
+		}
+	}
+
+	rdrPos, err := rdr.Seek(0, os.SEEK_CUR)
+	if err != nil {
+		return -1, err
+	}
+	r.pos = &pos{r.posIdx[rdr], rdrPos}
+	return buf.Read(b)
+}
+
+func getReadSeekerSize(rdr io.ReadSeeker) (int64, error) {
+	// save the current position
+	pos, err := rdr.Seek(0, os.SEEK_CUR)
+	if err != nil {
+		return -1, err
+	}
+
+	// get the size
+	size, err := rdr.Seek(0, os.SEEK_END)
+	if err != nil {
+		return -1, err
+	}
+
+	// reset the position
+	if _, err := rdr.Seek(pos, os.SEEK_SET); err != nil {
+		return -1, err
+	}
+	return size, nil
+}
+
+// MultiReadSeeker returns a ReadSeeker that's the logical concatenation of the provided
+// input readseekers. After calling this method the initial position is set to the
+// beginning of the first ReadSeeker. At the end of a ReadSeeker, Read always advances
+// to the beginning of the next ReadSeeker and returns EOF at the end of the last ReadSeeker.
+// Seek can be used over the sum of lengths of all readseekers.
+//
+// When a MultiReadSeeker is used, no Read and Seek operations should be made on
+// its ReadSeeker components. Also, users should make no assumption on the state
+// of individual readseekers while the MultiReadSeeker is used.
+func MultiReadSeeker(readers ...io.ReadSeeker) io.ReadSeeker {
+	if len(readers) == 1 {
+		return readers[0]
+	}
+	idx := make(map[io.ReadSeeker]int)
+	for i, rdr := range readers {
+		idx[rdr] = i
+	}
+	return &multiReadSeeker{
+		readers: readers,
+		posIdx:  idx,
+	}
+}

pkg/ioutils/multireader_test.go

@@ -0,0 +1,149 @@
+package ioutils
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"strings"
+	"testing"
+)
+
+func TestMultiReadSeekerReadAll(t *testing.T) {
+	str := "hello world"
+	s1 := strings.NewReader(str + " 1")
+	s2 := strings.NewReader(str + " 2")
+	s3 := strings.NewReader(str + " 3")
+	mr := MultiReadSeeker(s1, s2, s3)
+
+	expectedSize := int64(s1.Len() + s2.Len() + s3.Len())
+
+	b, err := ioutil.ReadAll(mr)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expected := "hello world 1hello world 2hello world 3"
+	if string(b) != expected {
+		t.Fatalf("ReadAll failed, got: %q, expected %q", string(b), expected)
+	}
+
+	size, err := mr.Seek(0, os.SEEK_END)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if size != expectedSize {
+		t.Fatalf("reader size does not match, got %d, expected %d", size, expectedSize)
+	}
+
+	// Reset the position and read again
+	pos, err := mr.Seek(0, os.SEEK_SET)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if pos != 0 {
+		t.Fatalf("expected position to be set to 0, got %d", pos)
+	}
+
+	b, err = ioutil.ReadAll(mr)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if string(b) != expected {
+		t.Fatalf("ReadAll failed, got: %q, expected %q", string(b), expected)
+	}
+}
+
+func TestMultiReadSeekerReadEach(t *testing.T) {
+	str := "hello world"
+	s1 := strings.NewReader(str + " 1")
+	s2 := strings.NewReader(str + " 2")
+	s3 := strings.NewReader(str + " 3")
+	mr := MultiReadSeeker(s1, s2, s3)
+
+	var totalBytes int64
+	for i, s := range []*strings.Reader{s1, s2, s3} {
+		sLen := int64(s.Len())
+		buf := make([]byte, s.Len())
+		expected := []byte(fmt.Sprintf("%s %d", str, i+1))
+
+		if _, err := mr.Read(buf); err != nil && err != io.EOF {
+			t.Fatal(err)
+		}
+
+		if !bytes.Equal(buf, expected) {
+			t.Fatalf("expected %q to be %q", string(buf), string(expected))
+		}
+
+		pos, err := mr.Seek(0, os.SEEK_CUR)
+		if err != nil {
+			t.Fatalf("iteration: %d, error: %v", i+1, err)
+		}
+
+		// check that the total bytes read is the current position of the seeker
+		totalBytes += sLen
+		if pos != totalBytes {
+			t.Fatalf("expected current position to be: %d, got: %d, iteration: %d", totalBytes, pos, i+1)
+		}
+
+		// This tests not only that SEEK_SET and SEEK_CUR give the same values, but that the next iteration is in the expected position as well
+		newPos, err := mr.Seek(pos, os.SEEK_SET)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if newPos != pos {
+			t.Fatalf("expected to get same position when calling SEEK_SET with value from SEEK_CUR, cur: %d, set: %d", pos, newPos)
+		}
+	}
+}
+
+func TestMultiReadSeekerReadSpanningChunks(t *testing.T) {
+	str := "hello world"
+	s1 := strings.NewReader(str + " 1")
+	s2 := strings.NewReader(str + " 2")
+	s3 := strings.NewReader(str + " 3")
+	mr := MultiReadSeeker(s1, s2, s3)
+
+	buf := make([]byte, s1.Len()+3)
+	_, err := mr.Read(buf)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// expected is the contents of s1 + 3 bytes from s2, ie, the `hel` at the end of this string
+	expected := "hello world 1hel"
+	if string(buf) != expected {
+		t.Fatalf("expected %s to be %s", string(buf), expected)
+	}
+}
+
+func TestMultiReadSeekerNegativeSeek(t *testing.T) {
+	str := "hello world"
+	s1 := strings.NewReader(str + " 1")
+	s2 := strings.NewReader(str + " 2")
+	s3 := strings.NewReader(str + " 3")
+	mr := MultiReadSeeker(s1, s2, s3)
+
+	s1Len := s1.Len()
+	s2Len := s2.Len()
+	s3Len := s3.Len()
+
+	s, err := mr.Seek(int64(-1*s3.Len()), os.SEEK_END)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if s != int64(s1Len+s2Len) {
+		t.Fatalf("expected %d to be %d", s, s1.Len()+s2.Len())
+	}
+
+	buf := make([]byte, s3Len)
+	if _, err := mr.Read(buf); err != nil && err != io.EOF {
+		t.Fatal(err)
+	}
+	expected := fmt.Sprintf("%s %d", str, 3)
+	if string(buf) != fmt.Sprintf("%s %d", str, 3) {
+		t.Fatalf("expected %q to be %q", string(buf), expected)
+	}
+}

pkg/jsonlog/jsonlog.go

@@ -3,7 +3,6 @@ package jsonlog
 import (
 	"encoding/json"
 	"fmt"
-	"io"
 	"time"
 )
 
@@ -29,28 +28,3 @@ func (jl *JSONLog) Reset() {
 	jl.Stream = ""
 	jl.Created = time.Time{}
 }
-
-func WriteLog(src io.Reader, dst io.Writer, format string, since time.Time) error {
-	dec := json.NewDecoder(src)
-	l := &JSONLog{}
-	for {
-		l.Reset()
-		if err := dec.Decode(l); err != nil {
-			if err == io.EOF {
-				return nil
-			}
-			return err
-		}
-		if !since.IsZero() && l.Created.Before(since) {
-			continue
-		}
-
-		line, err := l.Format(format)
-		if err != nil {
-			return err
-		}
-		if _, err := io.WriteString(dst, line); err != nil {
-			return err
-		}
-	}
-}

pkg/jsonlog/jsonlog_test.go

@@ -1,157 +0,0 @@
-package jsonlog
-
-import (
-	"bytes"
-	"encoding/json"
-	"io/ioutil"
-	"regexp"
-	"strconv"
-	"strings"
-	"testing"
-	"time"
-
-	"github.com/docker/docker/pkg/timeutils"
-)
-
-// Invalid json should return an error
-func TestWriteLogWithInvalidJSON(t *testing.T) {
-	json := strings.NewReader("Invalid json")
-	w := bytes.NewBuffer(nil)
-	if err := WriteLog(json, w, "json", time.Time{}); err == nil {
-		t.Fatalf("Expected an error, got [%v]", w.String())
-	}
-}
-
-// Any format is valid, it will just print it
-func TestWriteLogWithInvalidFormat(t *testing.T) {
-	testLine := "Line that thinks that it is log line from docker\n"
-	var buf bytes.Buffer
-	e := json.NewEncoder(&buf)
-	for i := 0; i < 35; i++ {
-		e.Encode(JSONLog{Log: testLine, Stream: "stdout", Created: time.Now()})
-	}
-	w := bytes.NewBuffer(nil)
-	if err := WriteLog(&buf, w, "invalid format", time.Time{}); err != nil {
-		t.Fatal(err)
-	}
-	res := w.String()
-	t.Logf("Result of WriteLog: %q", res)
-	lines := strings.Split(strings.TrimSpace(res), "\n")
-	expression := "^invalid format Line that thinks that it is log line from docker$"
-	logRe := regexp.MustCompile(expression)
-	expectedLines := 35
-	if len(lines) != expectedLines {
-		t.Fatalf("Must be %v lines but got %d", expectedLines, len(lines))
-	}
-	for _, l := range lines {
-		if !logRe.MatchString(l) {
-			t.Fatalf("Log line not in expected format [%v]: %q", expression, l)
-		}
-	}
-}
-
-// Having multiple Log/Stream element
-func TestWriteLogWithMultipleStreamLog(t *testing.T) {
-	testLine := "Line that thinks that it is log line from docker\n"
-	var buf bytes.Buffer
-	e := json.NewEncoder(&buf)
-	for i := 0; i < 35; i++ {
-		e.Encode(JSONLog{Log: testLine, Stream: "stdout", Created: time.Now()})
-	}
-	w := bytes.NewBuffer(nil)
-	if err := WriteLog(&buf, w, "invalid format", time.Time{}); err != nil {
-		t.Fatal(err)
-	}
-	res := w.String()
-	t.Logf("Result of WriteLog: %q", res)
-	lines := strings.Split(strings.TrimSpace(res), "\n")
-	expression := "^invalid format Line that thinks that it is log line from docker$"
-	logRe := regexp.MustCompile(expression)
-	expectedLines := 35
-	if len(lines) != expectedLines {
-		t.Fatalf("Must be %v lines but got %d", expectedLines, len(lines))
-	}
-	for _, l := range lines {
-		if !logRe.MatchString(l) {
-			t.Fatalf("Log line not in expected format [%v]: %q", expression, l)
-		}
-	}
-}
-
-// Write log with since after created, it won't print anything
-func TestWriteLogWithDate(t *testing.T) {
-	created, _ := time.Parse("YYYY-MM-dd", "2015-01-01")
-	var buf bytes.Buffer
-	testLine := "Line that thinks that it is log line from docker\n"
-	jsonLog := JSONLog{Log: testLine, Stream: "stdout", Created: created}
-	if err := json.NewEncoder(&buf).Encode(jsonLog); err != nil {
-		t.Fatal(err)
-	}
-	w := bytes.NewBuffer(nil)
-	if err := WriteLog(&buf, w, "json", time.Now()); err != nil {
-		t.Fatal(err)
-	}
-	res := w.String()
-	if res != "" {
-		t.Fatalf("Expected empty log, got [%v]", res)
-	}
-}
-
-// Happy path :)
-func TestWriteLog(t *testing.T) {
-	testLine := "Line that thinks that it is log line from docker\n"
-	format := timeutils.RFC3339NanoFixed
-	logs := map[string][]string{
-		"":     {"35", "^Line that thinks that it is log line from docker$"},
-		"json": {"1", `^{\"log\":\"Line that thinks that it is log line from docker\\n\",\"stream\":\"stdout\",\"time\":.{30,}\"}$`},
-		// 30+ symbols, five more can come from system timezone
-		format: {"35", `.{30,} Line that thinks that it is log line from docker`},
-	}
-	for givenFormat, expressionAndLines := range logs {
-		expectedLines, _ := strconv.Atoi(expressionAndLines[0])
-		expression := expressionAndLines[1]
-		var buf bytes.Buffer
-		e := json.NewEncoder(&buf)
-		for i := 0; i < 35; i++ {
-			e.Encode(JSONLog{Log: testLine, Stream: "stdout", Created: time.Now()})
-		}
-		w := bytes.NewBuffer(nil)
-		if err := WriteLog(&buf, w, givenFormat, time.Time{}); err != nil {
-			t.Fatal(err)
-		}
-		res := w.String()
-		t.Logf("Result of WriteLog: %q", res)
-		lines := strings.Split(strings.TrimSpace(res), "\n")
-		if len(lines) != expectedLines {
-			t.Fatalf("Must be %v lines but got %d", expectedLines, len(lines))
-		}
-		logRe := regexp.MustCompile(expression)
-		for _, l := range lines {
-			if !logRe.MatchString(l) {
-				t.Fatalf("Log line not in expected format [%v]: %q", expression, l)
-			}
-		}
-	}
-}
-
-func BenchmarkWriteLog(b *testing.B) {
-	var buf bytes.Buffer
-	e := json.NewEncoder(&buf)
-	testLine := "Line that thinks that it is log line from docker\n"
-	for i := 0; i < 30; i++ {
-		e.Encode(JSONLog{Log: testLine, Stream: "stdout", Created: time.Now()})
-	}
-	r := bytes.NewReader(buf.Bytes())
-	w := ioutil.Discard
-	format := timeutils.RFC3339NanoFixed
-	b.SetBytes(int64(r.Len()))
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		if err := WriteLog(r, w, format, time.Time{}); err != nil {
-			b.Fatal(err)
-		}
-		b.StopTimer()
-		r.Seek(0, 0)
-		b.StartTimer()
-	}
-}

pkg/tailfile/tailfile.go

@@ -3,6 +3,7 @@ package tailfile
 import (
 	"bytes"
 	"errors"
+	"io"
 	"os"
 )
 
@@ -12,7 +13,7 @@ var eol = []byte("\n")
 var ErrNonPositiveLinesNumber = errors.New("Lines number must be positive")
 
 //TailFile returns last n lines of file f
-func TailFile(f *os.File, n int) ([][]byte, error) {
+func TailFile(f io.ReadSeeker, n int) ([][]byte, error) {
 	if n <= 0 {
 		return nil, ErrNonPositiveLinesNumber
 	}

vendor/src/gopkg.in/fsnotify.v1/.gitignore

@@ -0,0 +1,6 @@
+# Setup a Global .gitignore for OS and editor generated files:
+# https://help.github.com/articles/ignoring-files
+# git config --global core.excludesfile ~/.gitignore_global
+
+.vagrant
+*.sublime-project

vendor/src/gopkg.in/fsnotify.v1/.travis.yml

@@ -0,0 +1,15 @@
+sudo: false
+language: go
+
+go:
+  - 1.4.1
+
+before_script:
+  - FIXED=$(go fmt ./... | wc -l); if [ $FIXED -gt 0 ]; then echo "gofmt - $FIXED file(s) not formatted correctly, please run gofmt to fix this." && exit 1; fi
+
+os:
+  - linux
+  - osx
+
+notifications:
+  email: false

vendor/src/gopkg.in/fsnotify.v1/AUTHORS

@@ -0,0 +1,34 @@
+# Names should be added to this file as
+#	Name or Organization <email address>
+# The email address is not required for organizations.
+
+# You can update this list using the following command:
+#
+#   $ git shortlog -se | awk '{print $2 " " $3 " " $4}'
+
+# Please keep the list sorted.
+
+Adrien Bustany <adrien@bustany.org>
+Caleb Spare <cespare@gmail.com>
+Case Nelson <case@teammating.com>
+Chris Howey <howeyc@gmail.com> <chris@howey.me>
+Christoffer Buchholz <christoffer.buchholz@gmail.com>
+Dave Cheney <dave@cheney.net>
+Francisco Souza <f@souza.cc>
+Hari haran <hariharan.uno@gmail.com>
+John C Barstow
+Kelvin Fo <vmirage@gmail.com>
+Matt Layher <mdlayher@gmail.com>
+Nathan Youngman <git@nathany.com>
+Paul Hammond <paul@paulhammond.org>
+Pieter Droogendijk <pieter@binky.org.uk>
+Pursuit92 <JoshChase@techpursuit.net>
+Rob Figueiredo <robfig@gmail.com>
+Soge Zhang <zhssoge@gmail.com>
+Tilak Sharma <tilaks@google.com>
+Travis Cline <travis.cline@gmail.com>
+Tudor Golubenco <tudor.g@gmail.com>
+Yukang <moorekang@gmail.com>
+bronze1man <bronze1man@gmail.com>
+debrando <denis.brandolini@gmail.com>
+henrikedwards <henrik.edwards@gmail.com>

vendor/src/gopkg.in/fsnotify.v1/CHANGELOG.md

@@ -0,0 +1,263 @@
+# Changelog
+
+## v1.2.0 / 2015-02-08
+
+* inotify: use epoll to wake up readEvents [#66](https://github.com/go-fsnotify/fsnotify/pull/66) (thanks @PieterD)
+* inotify: closing watcher should now always shut down goroutine [#63](https://github.com/go-fsnotify/fsnotify/pull/63) (thanks @PieterD)
+* kqueue: close kqueue after removing watches, fixes [#59](https://github.com/go-fsnotify/fsnotify/issues/59)
+
+## v1.1.1 / 2015-02-05
+
+* inotify: Retry read on EINTR [#61](https://github.com/go-fsnotify/fsnotify/issues/61) (thanks @PieterD)
+
+## v1.1.0 / 2014-12-12
+
+* kqueue: rework internals [#43](https://github.com/go-fsnotify/fsnotify/pull/43)
+    * add low-level functions
+    * only need to store flags on directories
+    * less mutexes [#13](https://github.com/go-fsnotify/fsnotify/issues/13)
+    * done can be an unbuffered channel
+    * remove calls to os.NewSyscallError
+* More efficient string concatenation for Event.String() [#52](https://github.com/go-fsnotify/fsnotify/pull/52) (thanks @mdlayher)
+* kqueue: fix regression in  rework causing subdirectories to be watched [#48](https://github.com/go-fsnotify/fsnotify/issues/48)
+* kqueue: cleanup internal watch before sending remove event [#51](https://github.com/go-fsnotify/fsnotify/issues/51)
+
+## v1.0.4 / 2014-09-07
+
+* kqueue: add dragonfly to the build tags.
+* Rename source code files, rearrange code so exported APIs are at the top.
+* Add done channel to example code. [#37](https://github.com/go-fsnotify/fsnotify/pull/37) (thanks @chenyukang)
+
+## v1.0.3 / 2014-08-19
+
+* [Fix] Windows MOVED_TO now translates to Create like on BSD and Linux. [#36](https://github.com/go-fsnotify/fsnotify/issues/36)
+
+## v1.0.2 / 2014-08-17
+
+* [Fix] Missing create events on OS X. [#14](https://github.com/go-fsnotify/fsnotify/issues/14) (thanks @zhsso)
+* [Fix] Make ./path and path equivalent. (thanks @zhsso)
+
+## v1.0.0 / 2014-08-15
+
+* [API] Remove AddWatch on Windows, use Add.
+* Improve documentation for exported identifiers. [#30](https://github.com/go-fsnotify/fsnotify/issues/30)
+* Minor updates based on feedback from golint.
+
+## dev / 2014-07-09
+
+* Moved to [github.com/go-fsnotify/fsnotify](https://github.com/go-fsnotify/fsnotify).
+* Use os.NewSyscallError instead of returning errno (thanks @hariharan-uno)
+ 
+## dev / 2014-07-04
+
+* kqueue: fix incorrect mutex used in Close()
+* Update example to demonstrate usage of Op.
+
+## dev / 2014-06-28
+
+* [API] Don't set the Write Op for attribute notifications [#4](https://github.com/go-fsnotify/fsnotify/issues/4)
+* Fix for String() method on Event (thanks Alex Brainman)
+* Don't build on Plan 9 or Solaris (thanks @4ad)
+
+## dev / 2014-06-21
+
+* Events channel of type Event rather than *Event.
+* [internal] use syscall constants directly for inotify and kqueue.
+* [internal] kqueue: rename events to kevents and fileEvent to event.
+
+## dev / 2014-06-19
+
+* Go 1.3+ required on Windows (uses syscall.ERROR_MORE_DATA internally).
+* [internal] remove cookie from Event struct (unused).
+* [internal] Event struct has the same definition across every OS.
+* [internal] remove internal watch and removeWatch methods.
+
+## dev / 2014-06-12
+
+* [API] Renamed Watch() to Add() and RemoveWatch() to Remove().
+* [API] Pluralized channel names: Events and Errors.
+* [API] Renamed FileEvent struct to Event.
+* [API] Op constants replace methods like IsCreate().
+
+## dev / 2014-06-12
+
+* Fix data race on kevent buffer (thanks @tilaks) [#98](https://github.com/howeyc/fsnotify/pull/98)
+
+## dev / 2014-05-23
+
+* [API] Remove current implementation of WatchFlags.
+    * current implementation doesn't take advantage of OS for efficiency
+    * provides little benefit over filtering events as they are received, but has  extra bookkeeping and mutexes
+    * no tests for the current implementation
+    * not fully implemented on Windows [#93](https://github.com/howeyc/fsnotify/issues/93#issuecomment-39285195)
+
+## v0.9.3 / 2014-12-31
+
+* kqueue: cleanup internal watch before sending remove event [#51](https://github.com/go-fsnotify/fsnotify/issues/51)
+
+## v0.9.2 / 2014-08-17
+
+* [Backport] Fix missing create events on OS X. [#14](https://github.com/go-fsnotify/fsnotify/issues/14) (thanks @zhsso)
+
+## v0.9.1 / 2014-06-12
+
+* Fix data race on kevent buffer (thanks @tilaks) [#98](https://github.com/howeyc/fsnotify/pull/98)
+
+## v0.9.0 / 2014-01-17
+
+* IsAttrib() for events that only concern a file's metadata [#79][] (thanks @abustany)
+* [Fix] kqueue: fix deadlock [#77][] (thanks @cespare)
+* [NOTICE] Development has moved to `code.google.com/p/go.exp/fsnotify` in preparation for inclusion in the Go standard library.
+
+## v0.8.12 / 2013-11-13
+
+* [API] Remove FD_SET and friends from Linux adapter
+
+## v0.8.11 / 2013-11-02
+
+* [Doc] Add Changelog [#72][] (thanks @nathany)
+* [Doc] Spotlight and double modify events on OS X [#62][] (reported by @paulhammond)
+
+## v0.8.10 / 2013-10-19
+
+* [Fix] kqueue: remove file watches when parent directory is removed [#71][] (reported by @mdwhatcott)
+* [Fix] kqueue: race between Close and readEvents [#70][] (reported by @bernerdschaefer)
+* [Doc] specify OS-specific limits in README (thanks @debrando)
+
+## v0.8.9 / 2013-09-08
+
+* [Doc] Contributing (thanks @nathany)
+* [Doc] update package path in example code [#63][] (thanks @paulhammond)
+* [Doc] GoCI badge in README (Linux only) [#60][]
+* [Doc] Cross-platform testing with Vagrant  [#59][] (thanks @nathany)
+
+## v0.8.8 / 2013-06-17
+
+* [Fix] Windows: handle `ERROR_MORE_DATA` on Windows [#49][] (thanks @jbowtie)
+
+## v0.8.7 / 2013-06-03
+
+* [API] Make syscall flags internal
+* [Fix] inotify: ignore event changes
+* [Fix] race in symlink test [#45][] (reported by @srid)
+* [Fix] tests on Windows
+* lower case error messages
+
+## v0.8.6 / 2013-05-23
+
+* kqueue: Use EVT_ONLY flag on Darwin
+* [Doc] Update README with full example
+
+## v0.8.5 / 2013-05-09
+
+* [Fix] inotify: allow monitoring of "broken" symlinks (thanks @tsg)
+
+## v0.8.4 / 2013-04-07
+
+* [Fix] kqueue: watch all file events [#40][] (thanks @ChrisBuchholz)
+
+## v0.8.3 / 2013-03-13
+
+* [Fix] inoitfy/kqueue memory leak [#36][] (reported by @nbkolchin)
+* [Fix] kqueue: use fsnFlags for watching a directory [#33][] (reported by @nbkolchin)
+
+## v0.8.2 / 2013-02-07
+
+* [Doc] add Authors
+* [Fix] fix data races for map access [#29][] (thanks @fsouza)
+
+## v0.8.1 / 2013-01-09
+
+* [Fix] Windows path separators
+* [Doc] BSD License
+
+## v0.8.0 / 2012-11-09
+
+* kqueue: directory watching improvements (thanks @vmirage)
+* inotify: add `IN_MOVED_TO` [#25][] (requested by @cpisto)
+* [Fix] kqueue: deleting watched directory [#24][] (reported by @jakerr)
+
+## v0.7.4 / 2012-10-09
+
+* [Fix] inotify: fixes from https://codereview.appspot.com/5418045/ (ugorji)
+* [Fix] kqueue: preserve watch flags when watching for delete [#21][] (reported by @robfig)
+* [Fix] kqueue: watch the directory even if it isn't a new watch (thanks @robfig)
+* [Fix] kqueue: modify after recreation of file
+
+## v0.7.3 / 2012-09-27
+
+* [Fix] kqueue: watch with an existing folder inside the watched folder (thanks @vmirage)
+* [Fix] kqueue: no longer get duplicate CREATE events
+
+## v0.7.2 / 2012-09-01
+
+* kqueue: events for created directories
+
+## v0.7.1 / 2012-07-14
+
+* [Fix] for renaming files
+
+## v0.7.0 / 2012-07-02
+
+* [Feature] FSNotify flags
+* [Fix] inotify: Added file name back to event path
+
+## v0.6.0 / 2012-06-06
+
+* kqueue: watch files after directory created (thanks @tmc)
+
+## v0.5.1 / 2012-05-22
+
+* [Fix] inotify: remove all watches before Close()
+
+## v0.5.0 / 2012-05-03
+
+* [API] kqueue: return errors during watch instead of sending over channel
+* kqueue: match symlink behavior on Linux
+* inotify: add `DELETE_SELF` (requested by @taralx)
+* [Fix] kqueue: handle EINTR (reported by @robfig)
+* [Doc] Godoc example [#1][] (thanks @davecheney)
+
+## v0.4.0 / 2012-03-30
+
+* Go 1 released: build with go tool
+* [Feature] Windows support using winfsnotify
+* Windows does not have attribute change notifications
+* Roll attribute notifications into IsModify
+
+## v0.3.0 / 2012-02-19
+
+* kqueue: add files when watch directory
+
+## v0.2.0 / 2011-12-30
+
+* update to latest Go weekly code
+
+## v0.1.0 / 2011-10-19
+
+* kqueue: add watch on file creation to match inotify
+* kqueue: create file event
+* inotify: ignore `IN_IGNORED` events
+* event String()
+* linux: common FileEvent functions
+* initial commit
+
+[#79]: https://github.com/howeyc/fsnotify/pull/79
+[#77]: https://github.com/howeyc/fsnotify/pull/77
+[#72]: https://github.com/howeyc/fsnotify/issues/72
+[#71]: https://github.com/howeyc/fsnotify/issues/71
+[#70]: https://github.com/howeyc/fsnotify/issues/70
+[#63]: https://github.com/howeyc/fsnotify/issues/63
+[#62]: https://github.com/howeyc/fsnotify/issues/62
+[#60]: https://github.com/howeyc/fsnotify/issues/60
+[#59]: https://github.com/howeyc/fsnotify/issues/59
+[#49]: https://github.com/howeyc/fsnotify/issues/49
+[#45]: https://github.com/howeyc/fsnotify/issues/45
+[#40]: https://github.com/howeyc/fsnotify/issues/40
+[#36]: https://github.com/howeyc/fsnotify/issues/36
+[#33]: https://github.com/howeyc/fsnotify/issues/33
+[#29]: https://github.com/howeyc/fsnotify/issues/29
+[#25]: https://github.com/howeyc/fsnotify/issues/25
+[#24]: https://github.com/howeyc/fsnotify/issues/24
+[#21]: https://github.com/howeyc/fsnotify/issues/21
+

vendor/src/gopkg.in/fsnotify.v1/CONTRIBUTING.md

@@ -0,0 +1,77 @@
+# Contributing
+
+## Issues
+
+* Request features and report bugs using the [GitHub Issue Tracker](https://github.com/go-fsnotify/fsnotify/issues).
+* Please indicate the platform you are using fsnotify on.
+* A code example to reproduce the problem is appreciated.
+
+## Pull Requests
+
+### Contributor License Agreement
+
+fsnotify is derived from code in the [golang.org/x/exp](https://godoc.org/golang.org/x/exp) package and it may be included [in the standard library](https://github.com/go-fsnotify/fsnotify/issues/1) in the future. Therefore fsnotify carries the same [LICENSE](https://github.com/go-fsnotify/fsnotify/blob/master/LICENSE) as Go. Contributors retain their copyright, so you need to fill out a short form before we can accept your contribution: [Google Individual Contributor License Agreement](https://developers.google.com/open-source/cla/individual).
+
+Please indicate that you have signed the CLA in your pull request.
+
+### How fsnotify is Developed
+
+* Development is done on feature branches.
+* Tests are run on BSD, Linux, OS X and Windows.
+* Pull requests are reviewed and [applied to master][am] using [hub][].
+  * Maintainers may modify or squash commits rather than asking contributors to.
+* To issue a new release, the maintainers will:
+  * Update the CHANGELOG
+  * Tag a version, which will become available through gopkg.in.
+ 
+### How to Fork
+
+For smooth sailing, always use the original import path. Installing with `go get` makes this easy. 
+
+1. Install from GitHub (`go get -u github.com/go-fsnotify/fsnotify`)
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Ensure everything works and the tests pass (see below)
+4. Commit your changes (`git commit -am 'Add some feature'`)
+
+Contribute upstream:
+
+1. Fork fsnotify on GitHub
+2. Add your remote (`git remote add fork git@github.com:mycompany/repo.git`)
+3. Push to the branch (`git push fork my-new-feature`)
+4. Create a new Pull Request on GitHub
+
+This workflow is [thoroughly explained by Katrina Owen](https://blog.splice.com/contributing-open-source-git-repositories-go/).
+
+### Testing
+
+fsnotify uses build tags to compile different code on Linux, BSD, OS X, and Windows.
+
+Before doing a pull request, please do your best to test your changes on multiple platforms, and list which platforms you were able/unable to test on.
+
+To aid in cross-platform testing there is a Vagrantfile for Linux and BSD.
+
+* Install [Vagrant](http://www.vagrantup.com/) and [VirtualBox](https://www.virtualbox.org/)
+* Setup [Vagrant Gopher](https://github.com/nathany/vagrant-gopher) in your `src` folder.
+* Run `vagrant up` from the project folder. You can also setup just one box with `vagrant up linux` or `vagrant up bsd` (note: the BSD box doesn't support Windows hosts at this time, and NFS may prompt for your host OS password)
+* Once setup, you can run the test suite on a given OS with a single command `vagrant ssh linux -c 'cd go-fsnotify/fsnotify; go test'`.
+* When you're done, you will want to halt or destroy the Vagrant boxes.
+
+Notice: fsnotify file system events won't trigger in shared folders. The tests get around this limitation by using the /tmp directory.
+
+Right now there is no equivalent solution for Windows and OS X, but there are Windows VMs [freely available from Microsoft](http://www.modern.ie/en-us/virtualization-tools#downloads).
+
+### Maintainers
+
+Help maintaining fsnotify is welcome. To be a maintainer:
+
+* Submit a pull request and sign the CLA as above.
+* You must be able to run the test suite on Mac, Windows, Linux and BSD.
+
+To keep master clean, the fsnotify project uses the "apply mail" workflow outlined in Nathaniel Talbott's post ["Merge pull request" Considered Harmful][am]. This requires installing [hub][].
+
+All code changes should be internal pull requests.
+
+Releases are tagged using [Semantic Versioning](http://semver.org/).
+
+[hub]: https://github.com/github/hub
+[am]: http://blog.spreedly.com/2014/06/24/merge-pull-request-considered-harmful/#.VGa5yZPF_Zs

vendor/src/gopkg.in/fsnotify.v1/LICENSE

@@ -0,0 +1,28 @@
+Copyright (c) 2012 The Go Authors. All rights reserved.
+Copyright (c) 2012 fsnotify Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/src/gopkg.in/fsnotify.v1/README.md

@@ -0,0 +1,59 @@
+# File system notifications for Go
+
+[![Coverage](http://gocover.io/_badge/github.com/go-fsnotify/fsnotify)](http://gocover.io/github.com/go-fsnotify/fsnotify) [![GoDoc](https://godoc.org/gopkg.in/fsnotify.v1?status.svg)](https://godoc.org/gopkg.in/fsnotify.v1)
+
+Go 1.3+ required.
+
+Cross platform: Windows, Linux, BSD and OS X.
+
+|Adapter   |OS        |Status    |
+|----------|----------|----------|
+|inotify   |Linux, Android\*|Supported [![Build Status](https://travis-ci.org/go-fsnotify/fsnotify.svg?branch=master)](https://travis-ci.org/go-fsnotify/fsnotify)|
+|kqueue    |BSD, OS X, iOS\*|Supported [![Circle CI](https://circleci.com/gh/go-fsnotify/fsnotify.svg?style=svg)](https://circleci.com/gh/go-fsnotify/fsnotify)|
+|ReadDirectoryChangesW|Windows|Supported [![Build status](https://ci.appveyor.com/api/projects/status/ivwjubaih4r0udeh/branch/master?svg=true)](https://ci.appveyor.com/project/NathanYoungman/fsnotify/branch/master)|
+|FSEvents  |OS X          |[Planned](https://github.com/go-fsnotify/fsnotify/issues/11)|
+|FEN       |Solaris 11    |[Planned](https://github.com/go-fsnotify/fsnotify/issues/12)|
+|fanotify  |Linux 2.6.37+ | |
+|USN Journals |Windows    |[Maybe](https://github.com/go-fsnotify/fsnotify/issues/53)|
+|Polling   |*All*         |[Maybe](https://github.com/go-fsnotify/fsnotify/issues/9)|
+
+\* Android and iOS are untested.
+
+Please see [the documentation](https://godoc.org/gopkg.in/fsnotify.v1) for usage. Consult the [Wiki](https://github.com/go-fsnotify/fsnotify/wiki) for the FAQ and further information.
+
+## API stability
+
+Two major versions of fsnotify exist. 
+
+**[fsnotify.v0](https://gopkg.in/fsnotify.v0)** is API-compatible with [howeyc/fsnotify](https://godoc.org/github.com/howeyc/fsnotify). Bugfixes *may* be backported, but I recommend upgrading to v1.
+
+```go
+import "gopkg.in/fsnotify.v0"
+```
+
+\* Refer to the package as fsnotify (without the .v0 suffix).
+
+**[fsnotify.v1](https://gopkg.in/fsnotify.v1)** provides [a new API](https://godoc.org/gopkg.in/fsnotify.v1) based on [this design document](http://goo.gl/MrYxyA). You can import v1 with:
+
+```go
+import "gopkg.in/fsnotify.v1"
+```
+
+Further API changes are [planned](https://github.com/go-fsnotify/fsnotify/milestones), but a new major revision will be tagged, so you can depend on the v1 API.
+
+**Master** may have unreleased changes. Use it to test the very latest code or when [contributing][], but don't expect it to remain API-compatible:
+
+```go
+import "github.com/go-fsnotify/fsnotify"
+```
+
+## Contributing
+
+Please refer to [CONTRIBUTING][] before opening an issue or pull request.
+
+## Example
+
+See [example_test.go](https://github.com/go-fsnotify/fsnotify/blob/master/example_test.go).
+
+
+[contributing]: https://github.com/go-fsnotify/fsnotify/blob/master/CONTRIBUTING.md

vendor/src/gopkg.in/fsnotify.v1/circle.yml

@@ -0,0 +1,26 @@
+## OS X build (CircleCI iOS beta)
+
+# Pretend like it's an Xcode project, at least to get it running.
+machine:
+  environment:
+    XCODE_WORKSPACE: NotUsed.xcworkspace
+    XCODE_SCHEME: NotUsed
+    # This is where the go project is actually checked out to:
+    CIRCLE_BUILD_DIR: $HOME/.go_project/src/github.com/go-fsnotify/fsnotify
+
+dependencies:
+  pre:
+    - brew upgrade go
+
+test:
+  override:
+    - go test ./...
+
+# Idealized future config, eventually with cross-platform build matrix :-)
+
+# machine:
+#   go:
+#     version: 1.4
+#   os:
+#     - osx
+#     - linux

vendor/src/gopkg.in/fsnotify.v1/fsnotify.go

@@ -0,0 +1,62 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !plan9,!solaris
+
+// Package fsnotify provides a platform-independent interface for file system notifications.
+package fsnotify
+
+import (
+	"bytes"
+	"fmt"
+)
+
+// Event represents a single file system notification.
+type Event struct {
+	Name string // Relative path to the file or directory.
+	Op   Op     // File operation that triggered the event.
+}
+
+// Op describes a set of file operations.
+type Op uint32
+
+// These are the generalized file operations that can trigger a notification.
+const (
+	Create Op = 1 << iota
+	Write
+	Remove
+	Rename
+	Chmod
+)
+
+// String returns a string representation of the event in the form
+// "file: REMOVE|WRITE|..."
+func (e Event) String() string {
+	// Use a buffer for efficient string concatenation
+	var buffer bytes.Buffer
+
+	if e.Op&Create == Create {
+		buffer.WriteString("|CREATE")
+	}
+	if e.Op&Remove == Remove {
+		buffer.WriteString("|REMOVE")
+	}
+	if e.Op&Write == Write {
+		buffer.WriteString("|WRITE")
+	}
+	if e.Op&Rename == Rename {
+		buffer.WriteString("|RENAME")
+	}
+	if e.Op&Chmod == Chmod {
+		buffer.WriteString("|CHMOD")
+	}
+
+	// If buffer remains empty, return no event names
+	if buffer.Len() == 0 {
+		return fmt.Sprintf("%q: ", e.Name)
+	}
+
+	// Return a list of event names, with leading pipe character stripped
+	return fmt.Sprintf("%q: %s", e.Name, buffer.String()[1:])
+}

vendor/src/gopkg.in/fsnotify.v1/inotify.go

@@ -0,0 +1,306 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build linux
+
+package fsnotify
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"syscall"
+	"unsafe"
+)
+
+// Watcher watches a set of files, delivering events to a channel.
+type Watcher struct {
+	Events   chan Event
+	Errors   chan error
+	mu       sync.Mutex // Map access
+	fd       int
+	poller   *fdPoller
+	watches  map[string]*watch // Map of inotify watches (key: path)
+	paths    map[int]string    // Map of watched paths (key: watch descriptor)
+	done     chan struct{}     // Channel for sending a "quit message" to the reader goroutine
+	doneResp chan struct{}     // Channel to respond to Close
+}
+
+// NewWatcher establishes a new watcher with the underlying OS and begins waiting for events.
+func NewWatcher() (*Watcher, error) {
+	// Create inotify fd
+	fd, errno := syscall.InotifyInit()
+	if fd == -1 {
+		return nil, errno
+	}
+	// Create epoll
+	poller, err := newFdPoller(fd)
+	if err != nil {
+		syscall.Close(fd)
+		return nil, err
+	}
+	w := &Watcher{
+		fd:       fd,
+		poller:   poller,
+		watches:  make(map[string]*watch),
+		paths:    make(map[int]string),
+		Events:   make(chan Event),
+		Errors:   make(chan error),
+		done:     make(chan struct{}),
+		doneResp: make(chan struct{}),
+	}
+
+	go w.readEvents()
+	return w, nil
+}
+
+func (w *Watcher) isClosed() bool {
+	select {
+	case <-w.done:
+		return true
+	default:
+		return false
+	}
+}
+
+// Close removes all watches and closes the events channel.
+func (w *Watcher) Close() error {
+	if w.isClosed() {
+		return nil
+	}
+
+	// Send 'close' signal to goroutine, and set the Watcher to closed.
+	close(w.done)
+
+	// Wake up goroutine
+	w.poller.wake()
+
+	// Wait for goroutine to close
+	<-w.doneResp
+
+	return nil
+}
+
+// Add starts watching the named file or directory (non-recursively).
+func (w *Watcher) Add(name string) error {
+	name = filepath.Clean(name)
+	if w.isClosed() {
+		return errors.New("inotify instance already closed")
+	}
+
+	const agnosticEvents = syscall.IN_MOVED_TO | syscall.IN_MOVED_FROM |
+		syscall.IN_CREATE | syscall.IN_ATTRIB | syscall.IN_MODIFY |
+		syscall.IN_MOVE_SELF | syscall.IN_DELETE | syscall.IN_DELETE_SELF
+
+	var flags uint32 = agnosticEvents
+
+	w.mu.Lock()
+	watchEntry, found := w.watches[name]
+	w.mu.Unlock()
+	if found {
+		watchEntry.flags |= flags
+		flags |= syscall.IN_MASK_ADD
+	}
+	wd, errno := syscall.InotifyAddWatch(w.fd, name, flags)
+	if wd == -1 {
+		return errno
+	}
+
+	w.mu.Lock()
+	w.watches[name] = &watch{wd: uint32(wd), flags: flags}
+	w.paths[wd] = name
+	w.mu.Unlock()
+
+	return nil
+}
+
+// Remove stops watching the named file or directory (non-recursively).
+func (w *Watcher) Remove(name string) error {
+	name = filepath.Clean(name)
+
+	// Fetch the watch.
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	watch, ok := w.watches[name]
+
+	// Remove it from inotify.
+	if !ok {
+		return fmt.Errorf("can't remove non-existent inotify watch for: %s", name)
+	}
+	// inotify_rm_watch will return EINVAL if the file has been deleted;
+	// the inotify will already have been removed.
+	// That means we can safely delete it from our watches, whatever inotify_rm_watch does.
+	delete(w.watches, name)
+	success, errno := syscall.InotifyRmWatch(w.fd, watch.wd)
+	if success == -1 {
+		// TODO: Perhaps it's not helpful to return an error here in every case.
+		// the only two possible errors are:
+		// EBADF, which happens when w.fd is not a valid file descriptor of any kind.
+		// EINVAL, which is when fd is not an inotify descriptor or wd is not a valid watch descriptor.
+		// Watch descriptors are invalidated when they are removed explicitly or implicitly;
+		// explicitly by inotify_rm_watch, implicitly when the file they are watching is deleted.
+		return errno
+	}
+	return nil
+}
+
+type watch struct {
+	wd    uint32 // Watch descriptor (as returned by the inotify_add_watch() syscall)
+	flags uint32 // inotify flags of this watch (see inotify(7) for the list of valid flags)
+}
+
+// readEvents reads from the inotify file descriptor, converts the
+// received events into Event objects and sends them via the Events channel
+func (w *Watcher) readEvents() {
+	var (
+		buf   [syscall.SizeofInotifyEvent * 4096]byte // Buffer for a maximum of 4096 raw events
+		n     int                                     // Number of bytes read with read()
+		errno error                                   // Syscall errno
+		ok    bool                                    // For poller.wait
+	)
+
+	defer close(w.doneResp)
+	defer close(w.Errors)
+	defer close(w.Events)
+	defer syscall.Close(w.fd)
+	defer w.poller.close()
+
+	for {
+		// See if we have been closed.
+		if w.isClosed() {
+			return
+		}
+
+		ok, errno = w.poller.wait()
+		if errno != nil {
+			select {
+			case w.Errors <- errno:
+			case <-w.done:
+				return
+			}
+			continue
+		}
+
+		if !ok {
+			continue
+		}
+
+		n, errno = syscall.Read(w.fd, buf[:])
+		// If a signal interrupted execution, see if we've been asked to close, and try again.
+		// http://man7.org/linux/man-pages/man7/signal.7.html :
+		// "Before Linux 3.8, reads from an inotify(7) file descriptor were not restartable"
+		if errno == syscall.EINTR {
+			continue
+		}
+
+		// syscall.Read might have been woken up by Close. If so, we're done.
+		if w.isClosed() {
+			return
+		}
+
+		if n < syscall.SizeofInotifyEvent {
+			var err error
+			if n == 0 {
+				// If EOF is received. This should really never happen.
+				err = io.EOF
+			} else if n < 0 {
+				// If an error occured while reading.
+				err = errno
+			} else {
+				// Read was too short.
+				err = errors.New("notify: short read in readEvents()")
+			}
+			select {
+			case w.Errors <- err:
+			case <-w.done:
+				return
+			}
+			continue
+		}
+
+		var offset uint32
+		// We don't know how many events we just read into the buffer
+		// While the offset points to at least one whole event...
+		for offset <= uint32(n-syscall.SizeofInotifyEvent) {
+			// Point "raw" to the event in the buffer
+			raw := (*syscall.InotifyEvent)(unsafe.Pointer(&buf[offset]))
+
+			mask := uint32(raw.Mask)
+			nameLen := uint32(raw.Len)
+			// If the event happened to the watched directory or the watched file, the kernel
+			// doesn't append the filename to the event, but we would like to always fill the
+			// the "Name" field with a valid filename. We retrieve the path of the watch from
+			// the "paths" map.
+			w.mu.Lock()
+			name := w.paths[int(raw.Wd)]
+			w.mu.Unlock()
+			if nameLen > 0 {
+				// Point "bytes" at the first byte of the filename
+				bytes := (*[syscall.PathMax]byte)(unsafe.Pointer(&buf[offset+syscall.SizeofInotifyEvent]))
+				// The filename is padded with NULL bytes. TrimRight() gets rid of those.
+				name += "/" + strings.TrimRight(string(bytes[0:nameLen]), "\000")
+			}
+
+			event := newEvent(name, mask)
+
+			// Send the events that are not ignored on the events channel
+			if !event.ignoreLinux(mask) {
+				select {
+				case w.Events <- event:
+				case <-w.done:
+					return
+				}
+			}
+
+			// Move to the next event in the buffer
+			offset += syscall.SizeofInotifyEvent + nameLen
+		}
+	}
+}
+
+// Certain types of events can be "ignored" and not sent over the Events
+// channel. Such as events marked ignore by the kernel, or MODIFY events
+// against files that do not exist.
+func (e *Event) ignoreLinux(mask uint32) bool {
+	// Ignore anything the inotify API says to ignore
+	if mask&syscall.IN_IGNORED == syscall.IN_IGNORED {
+		return true
+	}
+
+	// If the event is not a DELETE or RENAME, the file must exist.
+	// Otherwise the event is ignored.
+	// *Note*: this was put in place because it was seen that a MODIFY
+	// event was sent after the DELETE. This ignores that MODIFY and
+	// assumes a DELETE will come or has come if the file doesn't exist.
+	if !(e.Op&Remove == Remove || e.Op&Rename == Rename) {
+		_, statErr := os.Lstat(e.Name)
+		return os.IsNotExist(statErr)
+	}
+	return false
+}
+
+// newEvent returns an platform-independent Event based on an inotify mask.
+func newEvent(name string, mask uint32) Event {
+	e := Event{Name: name}
+	if mask&syscall.IN_CREATE == syscall.IN_CREATE || mask&syscall.IN_MOVED_TO == syscall.IN_MOVED_TO {
+		e.Op |= Create
+	}
+	if mask&syscall.IN_DELETE_SELF == syscall.IN_DELETE_SELF || mask&syscall.IN_DELETE == syscall.IN_DELETE {
+		e.Op |= Remove
+	}
+	if mask&syscall.IN_MODIFY == syscall.IN_MODIFY {
+		e.Op |= Write
+	}
+	if mask&syscall.IN_MOVE_SELF == syscall.IN_MOVE_SELF || mask&syscall.IN_MOVED_FROM == syscall.IN_MOVED_FROM {
+		e.Op |= Rename
+	}
+	if mask&syscall.IN_ATTRIB == syscall.IN_ATTRIB {
+		e.Op |= Chmod
+	}
+	return e
+}

vendor/src/gopkg.in/fsnotify.v1/inotify_poller.go

@@ -0,0 +1,186 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build linux
+
+package fsnotify
+
+import (
+	"errors"
+	"syscall"
+)
+
+type fdPoller struct {
+	fd   int    // File descriptor (as returned by the inotify_init() syscall)
+	epfd int    // Epoll file descriptor
+	pipe [2]int // Pipe for waking up
+}
+
+func emptyPoller(fd int) *fdPoller {
+	poller := new(fdPoller)
+	poller.fd = fd
+	poller.epfd = -1
+	poller.pipe[0] = -1
+	poller.pipe[1] = -1
+	return poller
+}
+
+// Create a new inotify poller.
+// This creates an inotify handler, and an epoll handler.
+func newFdPoller(fd int) (*fdPoller, error) {
+	var errno error
+	poller := emptyPoller(fd)
+	defer func() {
+		if errno != nil {
+			poller.close()
+		}
+	}()
+	poller.fd = fd
+
+	// Create epoll fd
+	poller.epfd, errno = syscall.EpollCreate(1)
+	if poller.epfd == -1 {
+		return nil, errno
+	}
+	// Create pipe; pipe[0] is the read end, pipe[1] the write end.
+	errno = syscall.Pipe2(poller.pipe[:], syscall.O_NONBLOCK)
+	if errno != nil {
+		return nil, errno
+	}
+
+	// Register inotify fd with epoll
+	event := syscall.EpollEvent{
+		Fd:     int32(poller.fd),
+		Events: syscall.EPOLLIN,
+	}
+	errno = syscall.EpollCtl(poller.epfd, syscall.EPOLL_CTL_ADD, poller.fd, &event)
+	if errno != nil {
+		return nil, errno
+	}
+
+	// Register pipe fd with epoll
+	event = syscall.EpollEvent{
+		Fd:     int32(poller.pipe[0]),
+		Events: syscall.EPOLLIN,
+	}
+	errno = syscall.EpollCtl(poller.epfd, syscall.EPOLL_CTL_ADD, poller.pipe[0], &event)
+	if errno != nil {
+		return nil, errno
+	}
+
+	return poller, nil
+}
+
+// Wait using epoll.
+// Returns true if something is ready to be read,
+// false if there is not.
+func (poller *fdPoller) wait() (bool, error) {
+	// 3 possible events per fd, and 2 fds, makes a maximum of 6 events.
+	// I don't know whether epoll_wait returns the number of events returned,
+	// or the total number of events ready.
+	// I decided to catch both by making the buffer one larger than the maximum.
+	events := make([]syscall.EpollEvent, 7)
+	for {
+		n, errno := syscall.EpollWait(poller.epfd, events, -1)
+		if n == -1 {
+			if errno == syscall.EINTR {
+				continue
+			}
+			return false, errno
+		}
+		if n == 0 {
+			// If there are no events, try again.
+			continue
+		}
+		if n > 6 {
+			// This should never happen. More events were returned than should be possible.
+			return false, errors.New("epoll_wait returned more events than I know what to do with")
+		}
+		ready := events[:n]
+		epollhup := false
+		epollerr := false
+		epollin := false
+		for _, event := range ready {
+			if event.Fd == int32(poller.fd) {
+				if event.Events&syscall.EPOLLHUP != 0 {
+					// This should not happen, but if it does, treat it as a wakeup.
+					epollhup = true
+				}
+				if event.Events&syscall.EPOLLERR != 0 {
+					// If an error is waiting on the file descriptor, we should pretend
+					// something is ready to read, and let syscall.Read pick up the error.
+					epollerr = true
+				}
+				if event.Events&syscall.EPOLLIN != 0 {
+					// There is data to read.
+					epollin = true
+				}
+			}
+			if event.Fd == int32(poller.pipe[0]) {
+				if event.Events&syscall.EPOLLHUP != 0 {
+					// Write pipe descriptor was closed, by us. This means we're closing down the
+					// watcher, and we should wake up.
+				}
+				if event.Events&syscall.EPOLLERR != 0 {
+					// If an error is waiting on the pipe file descriptor.
+					// This is an absolute mystery, and should never ever happen.
+					return false, errors.New("Error on the pipe descriptor.")
+				}
+				if event.Events&syscall.EPOLLIN != 0 {
+					// This is a regular wakeup, so we have to clear the buffer.
+					err := poller.clearWake()
+					if err != nil {
+						return false, err
+					}
+				}
+			}
+		}
+
+		if epollhup || epollerr || epollin {
+			return true, nil
+		}
+		return false, nil
+	}
+}
+
+// Close the write end of the poller.
+func (poller *fdPoller) wake() error {
+	buf := make([]byte, 1)
+	n, errno := syscall.Write(poller.pipe[1], buf)
+	if n == -1 {
+		if errno == syscall.EAGAIN {
+			// Buffer is full, poller will wake.
+			return nil
+		}
+		return errno
+	}
+	return nil
+}
+
+func (poller *fdPoller) clearWake() error {
+	// You have to be woken up a LOT in order to get to 100!
+	buf := make([]byte, 100)
+	n, errno := syscall.Read(poller.pipe[0], buf)
+	if n == -1 {
+		if errno == syscall.EAGAIN {
+			// Buffer is empty, someone else cleared our wake.
+			return nil
+		}
+		return errno
+	}
+	return nil
+}
+
+// Close all poller file descriptors, but not the one passed to it.
+func (poller *fdPoller) close() {
+	if poller.pipe[1] != -1 {
+		syscall.Close(poller.pipe[1])
+	}
+	if poller.pipe[0] != -1 {
+		syscall.Close(poller.pipe[0])
+	}
+	if poller.epfd != -1 {
+		syscall.Close(poller.epfd)
+	}
+}

vendor/src/gopkg.in/fsnotify.v1/kqueue.go

@@ -0,0 +1,463 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build freebsd openbsd netbsd dragonfly darwin
+
+package fsnotify
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"sync"
+	"syscall"
+	"time"
+)
+
+// Watcher watches a set of files, delivering events to a channel.
+type Watcher struct {
+	Events chan Event
+	Errors chan error
+	done   chan bool // Channel for sending a "quit message" to the reader goroutine
+
+	kq int // File descriptor (as returned by the kqueue() syscall).
+
+	mu              sync.Mutex        // Protects access to watcher data
+	watches         map[string]int    // Map of watched file descriptors (key: path).
+	externalWatches map[string]bool   // Map of watches added by user of the library.
+	dirFlags        map[string]uint32 // Map of watched directories to fflags used in kqueue.
+	paths           map[int]pathInfo  // Map file descriptors to path names for processing kqueue events.
+	fileExists      map[string]bool   // Keep track of if we know this file exists (to stop duplicate create events).
+	isClosed        bool              // Set to true when Close() is first called
+}
+
+type pathInfo struct {
+	name  string
+	isDir bool
+}
+
+// NewWatcher establishes a new watcher with the underlying OS and begins waiting for events.
+func NewWatcher() (*Watcher, error) {
+	kq, err := kqueue()
+	if err != nil {
+		return nil, err
+	}
+
+	w := &Watcher{
+		kq:              kq,
+		watches:         make(map[string]int),
+		dirFlags:        make(map[string]uint32),
+		paths:           make(map[int]pathInfo),
+		fileExists:      make(map[string]bool),
+		externalWatches: make(map[string]bool),
+		Events:          make(chan Event),
+		Errors:          make(chan error),
+		done:            make(chan bool),
+	}
+
+	go w.readEvents()
+	return w, nil
+}
+
+// Close removes all watches and closes the events channel.
+func (w *Watcher) Close() error {
+	w.mu.Lock()
+	if w.isClosed {
+		w.mu.Unlock()
+		return nil
+	}
+	w.isClosed = true
+	w.mu.Unlock()
+
+	w.mu.Lock()
+	ws := w.watches
+	w.mu.Unlock()
+
+	var err error
+	for name := range ws {
+		if e := w.Remove(name); e != nil && err == nil {
+			err = e
+		}
+	}
+
+	// Send "quit" message to the reader goroutine:
+	w.done <- true
+
+	return nil
+}
+
+// Add starts watching the named file or directory (non-recursively).
+func (w *Watcher) Add(name string) error {
+	w.mu.Lock()
+	w.externalWatches[name] = true
+	w.mu.Unlock()
+	return w.addWatch(name, noteAllEvents)
+}
+
+// Remove stops watching the the named file or directory (non-recursively).
+func (w *Watcher) Remove(name string) error {
+	name = filepath.Clean(name)
+	w.mu.Lock()
+	watchfd, ok := w.watches[name]
+	w.mu.Unlock()
+	if !ok {
+		return fmt.Errorf("can't remove non-existent kevent watch for: %s", name)
+	}
+
+	const registerRemove = syscall.EV_DELETE
+	if err := register(w.kq, []int{watchfd}, registerRemove, 0); err != nil {
+		return err
+	}
+
+	syscall.Close(watchfd)
+
+	w.mu.Lock()
+	isDir := w.paths[watchfd].isDir
+	delete(w.watches, name)
+	delete(w.paths, watchfd)
+	delete(w.dirFlags, name)
+	w.mu.Unlock()
+
+	// Find all watched paths that are in this directory that are not external.
+	if isDir {
+		var pathsToRemove []string
+		w.mu.Lock()
+		for _, path := range w.paths {
+			wdir, _ := filepath.Split(path.name)
+			if filepath.Clean(wdir) == name {
+				if !w.externalWatches[path.name] {
+					pathsToRemove = append(pathsToRemove, path.name)
+				}
+			}
+		}
+		w.mu.Unlock()
+		for _, name := range pathsToRemove {
+			// Since these are internal, not much sense in propagating error
+			// to the user, as that will just confuse them with an error about
+			// a path they did not explicitly watch themselves.
+			w.Remove(name)
+		}
+	}
+
+	return nil
+}
+
+// Watch all events (except NOTE_EXTEND, NOTE_LINK, NOTE_REVOKE)
+const noteAllEvents = syscall.NOTE_DELETE | syscall.NOTE_WRITE | syscall.NOTE_ATTRIB | syscall.NOTE_RENAME
+
+// keventWaitTime to block on each read from kevent
+var keventWaitTime = durationToTimespec(100 * time.Millisecond)
+
+// addWatch adds name to the watched file set.
+// The flags are interpreted as described in kevent(2).
+func (w *Watcher) addWatch(name string, flags uint32) error {
+	var isDir bool
+	// Make ./name and name equivalent
+	name = filepath.Clean(name)
+
+	w.mu.Lock()
+	if w.isClosed {
+		w.mu.Unlock()
+		return errors.New("kevent instance already closed")
+	}
+	watchfd, alreadyWatching := w.watches[name]
+	// We already have a watch, but we can still override flags.
+	if alreadyWatching {
+		isDir = w.paths[watchfd].isDir
+	}
+	w.mu.Unlock()
+
+	if !alreadyWatching {
+		fi, err := os.Lstat(name)
+		if err != nil {
+			return err
+		}
+
+		// Don't watch sockets.
+		if fi.Mode()&os.ModeSocket == os.ModeSocket {
+			return nil
+		}
+
+		// Follow Symlinks
+		// Unfortunately, Linux can add bogus symlinks to watch list without
+		// issue, and Windows can't do symlinks period (AFAIK). To  maintain
+		// consistency, we will act like everything is fine. There will simply
+		// be no file events for broken symlinks.
+		// Hence the returns of nil on errors.
+		if fi.Mode()&os.ModeSymlink == os.ModeSymlink {
+			name, err = filepath.EvalSymlinks(name)
+			if err != nil {
+				return nil
+			}
+
+			fi, err = os.Lstat(name)
+			if err != nil {
+				return nil
+			}
+		}
+
+		watchfd, err = syscall.Open(name, openMode, 0700)
+		if watchfd == -1 {
+			return err
+		}
+
+		isDir = fi.IsDir()
+	}
+
+	const registerAdd = syscall.EV_ADD | syscall.EV_CLEAR | syscall.EV_ENABLE
+	if err := register(w.kq, []int{watchfd}, registerAdd, flags); err != nil {
+		syscall.Close(watchfd)
+		return err
+	}
+
+	if !alreadyWatching {
+		w.mu.Lock()
+		w.watches[name] = watchfd
+		w.paths[watchfd] = pathInfo{name: name, isDir: isDir}
+		w.mu.Unlock()
+	}
+
+	if isDir {
+		// Watch the directory if it has not been watched before,
+		// or if it was watched before, but perhaps only a NOTE_DELETE (watchDirectoryFiles)
+		w.mu.Lock()
+		watchDir := (flags&syscall.NOTE_WRITE) == syscall.NOTE_WRITE &&
+			(!alreadyWatching || (w.dirFlags[name]&syscall.NOTE_WRITE) != syscall.NOTE_WRITE)
+		// Store flags so this watch can be updated later
+		w.dirFlags[name] = flags
+		w.mu.Unlock()
+
+		if watchDir {
+			if err := w.watchDirectoryFiles(name); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// readEvents reads from kqueue and converts the received kevents into
+// Event values that it sends down the Events channel.
+func (w *Watcher) readEvents() {
+	eventBuffer := make([]syscall.Kevent_t, 10)
+
+	for {
+		// See if there is a message on the "done" channel
+		select {
+		case <-w.done:
+			err := syscall.Close(w.kq)
+			if err != nil {
+				w.Errors <- err
+			}
+			close(w.Events)
+			close(w.Errors)
+			return
+		default:
+		}
+
+		// Get new events
+		kevents, err := read(w.kq, eventBuffer, &keventWaitTime)
+		// EINTR is okay, the syscall was interrupted before timeout expired.
+		if err != nil && err != syscall.EINTR {
+			w.Errors <- err
+			continue
+		}
+
+		// Flush the events we received to the Events channel
+		for len(kevents) > 0 {
+			kevent := &kevents[0]
+			watchfd := int(kevent.Ident)
+			mask := uint32(kevent.Fflags)
+			w.mu.Lock()
+			path := w.paths[watchfd]
+			w.mu.Unlock()
+			event := newEvent(path.name, mask)
+
+			if path.isDir && !(event.Op&Remove == Remove) {
+				// Double check to make sure the directory exists. This can happen when
+				// we do a rm -fr on a recursively watched folders and we receive a
+				// modification event first but the folder has been deleted and later
+				// receive the delete event
+				if _, err := os.Lstat(event.Name); os.IsNotExist(err) {
+					// mark is as delete event
+					event.Op |= Remove
+				}
+			}
+
+			if event.Op&Rename == Rename || event.Op&Remove == Remove {
+				w.Remove(event.Name)
+				w.mu.Lock()
+				delete(w.fileExists, event.Name)
+				w.mu.Unlock()
+			}
+
+			if path.isDir && event.Op&Write == Write && !(event.Op&Remove == Remove) {
+				w.sendDirectoryChangeEvents(event.Name)
+			} else {
+				// Send the event on the Events channel
+				w.Events <- event
+			}
+
+			if event.Op&Remove == Remove {
+				// Look for a file that may have overwritten this.
+				// For example, mv f1 f2 will delete f2, then create f2.
+				fileDir, _ := filepath.Split(event.Name)
+				fileDir = filepath.Clean(fileDir)
+				w.mu.Lock()
+				_, found := w.watches[fileDir]
+				w.mu.Unlock()
+				if found {
+					// make sure the directory exists before we watch for changes. When we
+					// do a recursive watch and perform rm -fr, the parent directory might
+					// have gone missing, ignore the missing directory and let the
+					// upcoming delete event remove the watch from the parent directory.
+					if _, err := os.Lstat(fileDir); os.IsExist(err) {
+						w.sendDirectoryChangeEvents(fileDir)
+						// FIXME: should this be for events on files or just isDir?
+					}
+				}
+			}
+
+			// Move to next event
+			kevents = kevents[1:]
+		}
+	}
+}
+
+// newEvent returns an platform-independent Event based on kqueue Fflags.
+func newEvent(name string, mask uint32) Event {
+	e := Event{Name: name}
+	if mask&syscall.NOTE_DELETE == syscall.NOTE_DELETE {
+		e.Op |= Remove
+	}
+	if mask&syscall.NOTE_WRITE == syscall.NOTE_WRITE {
+		e.Op |= Write
+	}
+	if mask&syscall.NOTE_RENAME == syscall.NOTE_RENAME {
+		e.Op |= Rename
+	}
+	if mask&syscall.NOTE_ATTRIB == syscall.NOTE_ATTRIB {
+		e.Op |= Chmod
+	}
+	return e
+}
+
+func newCreateEvent(name string) Event {
+	return Event{Name: name, Op: Create}
+}
+
+// watchDirectoryFiles to mimic inotify when adding a watch on a directory
+func (w *Watcher) watchDirectoryFiles(dirPath string) error {
+	// Get all files
+	files, err := ioutil.ReadDir(dirPath)
+	if err != nil {
+		return err
+	}
+
+	for _, fileInfo := range files {
+		filePath := filepath.Join(dirPath, fileInfo.Name())
+		if err := w.internalWatch(filePath, fileInfo); err != nil {
+			return err
+		}
+
+		w.mu.Lock()
+		w.fileExists[filePath] = true
+		w.mu.Unlock()
+	}
+
+	return nil
+}
+
+// sendDirectoryEvents searches the directory for newly created files
+// and sends them over the event channel. This functionality is to have
+// the BSD version of fsnotify match Linux inotify which provides a
+// create event for files created in a watched directory.
+func (w *Watcher) sendDirectoryChangeEvents(dirPath string) {
+	// Get all files
+	files, err := ioutil.ReadDir(dirPath)
+	if err != nil {
+		w.Errors <- err
+	}
+
+	// Search for new files
+	for _, fileInfo := range files {
+		filePath := filepath.Join(dirPath, fileInfo.Name())
+		w.mu.Lock()
+		_, doesExist := w.fileExists[filePath]
+		w.mu.Unlock()
+		if !doesExist {
+			// Send create event
+			w.Events <- newCreateEvent(filePath)
+		}
+
+		// like watchDirectoryFiles (but without doing another ReadDir)
+		if err := w.internalWatch(filePath, fileInfo); err != nil {
+			return
+		}
+
+		w.mu.Lock()
+		w.fileExists[filePath] = true
+		w.mu.Unlock()
+	}
+}
+
+func (w *Watcher) internalWatch(name string, fileInfo os.FileInfo) error {
+	if fileInfo.IsDir() {
+		// mimic Linux providing delete events for subdirectories
+		// but preserve the flags used if currently watching subdirectory
+		w.mu.Lock()
+		flags := w.dirFlags[name]
+		w.mu.Unlock()
+
+		flags |= syscall.NOTE_DELETE
+		return w.addWatch(name, flags)
+	}
+
+	// watch file to mimic Linux inotify
+	return w.addWatch(name, noteAllEvents)
+}
+
+// kqueue creates a new kernel event queue and returns a descriptor.
+func kqueue() (kq int, err error) {
+	kq, err = syscall.Kqueue()
+	if kq == -1 {
+		return kq, err
+	}
+	return kq, nil
+}
+
+// register events with the queue
+func register(kq int, fds []int, flags int, fflags uint32) error {
+	changes := make([]syscall.Kevent_t, len(fds))
+
+	for i, fd := range fds {
+		// SetKevent converts int to the platform-specific types:
+		syscall.SetKevent(&changes[i], fd, syscall.EVFILT_VNODE, flags)
+		changes[i].Fflags = fflags
+	}
+
+	// register the events
+	success, err := syscall.Kevent(kq, changes, nil, nil)
+	if success == -1 {
+		return err
+	}
+	return nil
+}
+
+// read retrieves pending events, or waits until an event occurs.
+// A timeout of nil blocks indefinitely, while 0 polls the queue.
+func read(kq int, events []syscall.Kevent_t, timeout *syscall.Timespec) ([]syscall.Kevent_t, error) {
+	n, err := syscall.Kevent(kq, nil, events, timeout)
+	if err != nil {
+		return nil, err
+	}
+	return events[0:n], nil
+}
+
+// durationToTimespec prepares a timeout value
+func durationToTimespec(d time.Duration) syscall.Timespec {
+	return syscall.NsecToTimespec(d.Nanoseconds())
+}

vendor/src/gopkg.in/fsnotify.v1/open_mode_bsd.go

@@ -0,0 +1,11 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build freebsd openbsd netbsd dragonfly
+
+package fsnotify
+
+import "syscall"
+
+const openMode = syscall.O_NONBLOCK | syscall.O_RDONLY

vendor/src/gopkg.in/fsnotify.v1/open_mode_darwin.go

@@ -0,0 +1,12 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin
+
+package fsnotify
+
+import "syscall"
+
+// note: this constant is not defined on BSD
+const openMode = syscall.O_EVTONLY

vendor/src/gopkg.in/fsnotify.v1/windows.go

@@ -0,0 +1,561 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build windows
+
+package fsnotify
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+	"sync"
+	"syscall"
+	"unsafe"
+)
+
+// Watcher watches a set of files, delivering events to a channel.
+type Watcher struct {
+	Events   chan Event
+	Errors   chan error
+	isClosed bool           // Set to true when Close() is first called
+	mu       sync.Mutex     // Map access
+	port     syscall.Handle // Handle to completion port
+	watches  watchMap       // Map of watches (key: i-number)
+	input    chan *input    // Inputs to the reader are sent on this channel
+	quit     chan chan<- error
+}
+
+// NewWatcher establishes a new watcher with the underlying OS and begins waiting for events.
+func NewWatcher() (*Watcher, error) {
+	port, e := syscall.CreateIoCompletionPort(syscall.InvalidHandle, 0, 0, 0)
+	if e != nil {
+		return nil, os.NewSyscallError("CreateIoCompletionPort", e)
+	}
+	w := &Watcher{
+		port:    port,
+		watches: make(watchMap),
+		input:   make(chan *input, 1),
+		Events:  make(chan Event, 50),
+		Errors:  make(chan error),
+		quit:    make(chan chan<- error, 1),
+	}
+	go w.readEvents()
+	return w, nil
+}
+
+// Close removes all watches and closes the events channel.
+func (w *Watcher) Close() error {
+	if w.isClosed {
+		return nil
+	}
+	w.isClosed = true
+
+	// Send "quit" message to the reader goroutine
+	ch := make(chan error)
+	w.quit <- ch
+	if err := w.wakeupReader(); err != nil {
+		return err
+	}
+	return <-ch
+}
+
+// Add starts watching the named file or directory (non-recursively).
+func (w *Watcher) Add(name string) error {
+	if w.isClosed {
+		return errors.New("watcher already closed")
+	}
+	in := &input{
+		op:    opAddWatch,
+		path:  filepath.Clean(name),
+		flags: sys_FS_ALL_EVENTS,
+		reply: make(chan error),
+	}
+	w.input <- in
+	if err := w.wakeupReader(); err != nil {
+		return err
+	}
+	return <-in.reply
+}
+
+// Remove stops watching the the named file or directory (non-recursively).
+func (w *Watcher) Remove(name string) error {
+	in := &input{
+		op:    opRemoveWatch,
+		path:  filepath.Clean(name),
+		reply: make(chan error),
+	}
+	w.input <- in
+	if err := w.wakeupReader(); err != nil {
+		return err
+	}
+	return <-in.reply
+}
+
+const (
+	// Options for AddWatch
+	sys_FS_ONESHOT = 0x80000000
+	sys_FS_ONLYDIR = 0x1000000
+
+	// Events
+	sys_FS_ACCESS      = 0x1
+	sys_FS_ALL_EVENTS  = 0xfff
+	sys_FS_ATTRIB      = 0x4
+	sys_FS_CLOSE       = 0x18
+	sys_FS_CREATE      = 0x100
+	sys_FS_DELETE      = 0x200
+	sys_FS_DELETE_SELF = 0x400
+	sys_FS_MODIFY      = 0x2
+	sys_FS_MOVE        = 0xc0
+	sys_FS_MOVED_FROM  = 0x40
+	sys_FS_MOVED_TO    = 0x80
+	sys_FS_MOVE_SELF   = 0x800
+
+	// Special events
+	sys_FS_IGNORED    = 0x8000
+	sys_FS_Q_OVERFLOW = 0x4000
+)
+
+func newEvent(name string, mask uint32) Event {
+	e := Event{Name: name}
+	if mask&sys_FS_CREATE == sys_FS_CREATE || mask&sys_FS_MOVED_TO == sys_FS_MOVED_TO {
+		e.Op |= Create
+	}
+	if mask&sys_FS_DELETE == sys_FS_DELETE || mask&sys_FS_DELETE_SELF == sys_FS_DELETE_SELF {
+		e.Op |= Remove
+	}
+	if mask&sys_FS_MODIFY == sys_FS_MODIFY {
+		e.Op |= Write
+	}
+	if mask&sys_FS_MOVE == sys_FS_MOVE || mask&sys_FS_MOVE_SELF == sys_FS_MOVE_SELF || mask&sys_FS_MOVED_FROM == sys_FS_MOVED_FROM {
+		e.Op |= Rename
+	}
+	if mask&sys_FS_ATTRIB == sys_FS_ATTRIB {
+		e.Op |= Chmod
+	}
+	return e
+}
+
+const (
+	opAddWatch = iota
+	opRemoveWatch
+)
+
+const (
+	provisional uint64 = 1 << (32 + iota)
+)
+
+type input struct {
+	op    int
+	path  string
+	flags uint32
+	reply chan error
+}
+
+type inode struct {
+	handle syscall.Handle
+	volume uint32
+	index  uint64
+}
+
+type watch struct {
+	ov     syscall.Overlapped
+	ino    *inode            // i-number
+	path   string            // Directory path
+	mask   uint64            // Directory itself is being watched with these notify flags
+	names  map[string]uint64 // Map of names being watched and their notify flags
+	rename string            // Remembers the old name while renaming a file
+	buf    [4096]byte
+}
+
+type indexMap map[uint64]*watch
+type watchMap map[uint32]indexMap
+
+func (w *Watcher) wakeupReader() error {
+	e := syscall.PostQueuedCompletionStatus(w.port, 0, 0, nil)
+	if e != nil {
+		return os.NewSyscallError("PostQueuedCompletionStatus", e)
+	}
+	return nil
+}
+
+func getDir(pathname string) (dir string, err error) {
+	attr, e := syscall.GetFileAttributes(syscall.StringToUTF16Ptr(pathname))
+	if e != nil {
+		return "", os.NewSyscallError("GetFileAttributes", e)
+	}
+	if attr&syscall.FILE_ATTRIBUTE_DIRECTORY != 0 {
+		dir = pathname
+	} else {
+		dir, _ = filepath.Split(pathname)
+		dir = filepath.Clean(dir)
+	}
+	return
+}
+
+func getIno(path string) (ino *inode, err error) {
+	h, e := syscall.CreateFile(syscall.StringToUTF16Ptr(path),
+		syscall.FILE_LIST_DIRECTORY,
+		syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE|syscall.FILE_SHARE_DELETE,
+		nil, syscall.OPEN_EXISTING,
+		syscall.FILE_FLAG_BACKUP_SEMANTICS|syscall.FILE_FLAG_OVERLAPPED, 0)
+	if e != nil {
+		return nil, os.NewSyscallError("CreateFile", e)
+	}
+	var fi syscall.ByHandleFileInformation
+	if e = syscall.GetFileInformationByHandle(h, &fi); e != nil {
+		syscall.CloseHandle(h)
+		return nil, os.NewSyscallError("GetFileInformationByHandle", e)
+	}
+	ino = &inode{
+		handle: h,
+		volume: fi.VolumeSerialNumber,
+		index:  uint64(fi.FileIndexHigh)<<32 | uint64(fi.FileIndexLow),
+	}
+	return ino, nil
+}
+
+// Must run within the I/O thread.
+func (m watchMap) get(ino *inode) *watch {
+	if i := m[ino.volume]; i != nil {
+		return i[ino.index]
+	}
+	return nil
+}
+
+// Must run within the I/O thread.
+func (m watchMap) set(ino *inode, watch *watch) {
+	i := m[ino.volume]
+	if i == nil {
+		i = make(indexMap)
+		m[ino.volume] = i
+	}
+	i[ino.index] = watch
+}
+
+// Must run within the I/O thread.
+func (w *Watcher) addWatch(pathname string, flags uint64) error {
+	dir, err := getDir(pathname)
+	if err != nil {
+		return err
+	}
+	if flags&sys_FS_ONLYDIR != 0 && pathname != dir {
+		return nil
+	}
+	ino, err := getIno(dir)
+	if err != nil {
+		return err
+	}
+	w.mu.Lock()
+	watchEntry := w.watches.get(ino)
+	w.mu.Unlock()
+	if watchEntry == nil {
+		if _, e := syscall.CreateIoCompletionPort(ino.handle, w.port, 0, 0); e != nil {
+			syscall.CloseHandle(ino.handle)
+			return os.NewSyscallError("CreateIoCompletionPort", e)
+		}
+		watchEntry = &watch{
+			ino:   ino,
+			path:  dir,
+			names: make(map[string]uint64),
+		}
+		w.mu.Lock()
+		w.watches.set(ino, watchEntry)
+		w.mu.Unlock()
+		flags |= provisional
+	} else {
+		syscall.CloseHandle(ino.handle)
+	}
+	if pathname == dir {
+		watchEntry.mask |= flags
+	} else {
+		watchEntry.names[filepath.Base(pathname)] |= flags
+	}
+	if err = w.startRead(watchEntry); err != nil {
+		return err
+	}
+	if pathname == dir {
+		watchEntry.mask &= ^provisional
+	} else {
+		watchEntry.names[filepath.Base(pathname)] &= ^provisional
+	}
+	return nil
+}
+
+// Must run within the I/O thread.
+func (w *Watcher) remWatch(pathname string) error {
+	dir, err := getDir(pathname)
+	if err != nil {
+		return err
+	}
+	ino, err := getIno(dir)
+	if err != nil {
+		return err
+	}
+	w.mu.Lock()
+	watch := w.watches.get(ino)
+	w.mu.Unlock()
+	if watch == nil {
+		return fmt.Errorf("can't remove non-existent watch for: %s", pathname)
+	}
+	if pathname == dir {
+		w.sendEvent(watch.path, watch.mask&sys_FS_IGNORED)
+		watch.mask = 0
+	} else {
+		name := filepath.Base(pathname)
+		w.sendEvent(watch.path+"\\"+name, watch.names[name]&sys_FS_IGNORED)
+		delete(watch.names, name)
+	}
+	return w.startRead(watch)
+}
+
+// Must run within the I/O thread.
+func (w *Watcher) deleteWatch(watch *watch) {
+	for name, mask := range watch.names {
+		if mask&provisional == 0 {
+			w.sendEvent(watch.path+"\\"+name, mask&sys_FS_IGNORED)
+		}
+		delete(watch.names, name)
+	}
+	if watch.mask != 0 {
+		if watch.mask&provisional == 0 {
+			w.sendEvent(watch.path, watch.mask&sys_FS_IGNORED)
+		}
+		watch.mask = 0
+	}
+}
+
+// Must run within the I/O thread.
+func (w *Watcher) startRead(watch *watch) error {
+	if e := syscall.CancelIo(watch.ino.handle); e != nil {
+		w.Errors <- os.NewSyscallError("CancelIo", e)
+		w.deleteWatch(watch)
+	}
+	mask := toWindowsFlags(watch.mask)
+	for _, m := range watch.names {
+		mask |= toWindowsFlags(m)
+	}
+	if mask == 0 {
+		if e := syscall.CloseHandle(watch.ino.handle); e != nil {
+			w.Errors <- os.NewSyscallError("CloseHandle", e)
+		}
+		w.mu.Lock()
+		delete(w.watches[watch.ino.volume], watch.ino.index)
+		w.mu.Unlock()
+		return nil
+	}
+	e := syscall.ReadDirectoryChanges(watch.ino.handle, &watch.buf[0],
+		uint32(unsafe.Sizeof(watch.buf)), false, mask, nil, &watch.ov, 0)
+	if e != nil {
+		err := os.NewSyscallError("ReadDirectoryChanges", e)
+		if e == syscall.ERROR_ACCESS_DENIED && watch.mask&provisional == 0 {
+			// Watched directory was probably removed
+			if w.sendEvent(watch.path, watch.mask&sys_FS_DELETE_SELF) {
+				if watch.mask&sys_FS_ONESHOT != 0 {
+					watch.mask = 0
+				}
+			}
+			err = nil
+		}
+		w.deleteWatch(watch)
+		w.startRead(watch)
+		return err
+	}
+	return nil
+}
+
+// readEvents reads from the I/O completion port, converts the
+// received events into Event objects and sends them via the Events channel.
+// Entry point to the I/O thread.
+func (w *Watcher) readEvents() {
+	var (
+		n, key uint32
+		ov     *syscall.Overlapped
+	)
+	runtime.LockOSThread()
+
+	for {
+		e := syscall.GetQueuedCompletionStatus(w.port, &n, &key, &ov, syscall.INFINITE)
+		watch := (*watch)(unsafe.Pointer(ov))
+
+		if watch == nil {
+			select {
+			case ch := <-w.quit:
+				w.mu.Lock()
+				var indexes []indexMap
+				for _, index := range w.watches {
+					indexes = append(indexes, index)
+				}
+				w.mu.Unlock()
+				for _, index := range indexes {
+					for _, watch := range index {
+						w.deleteWatch(watch)
+						w.startRead(watch)
+					}
+				}
+				var err error
+				if e := syscall.CloseHandle(w.port); e != nil {
+					err = os.NewSyscallError("CloseHandle", e)
+				}
+				close(w.Events)
+				close(w.Errors)
+				ch <- err
+				return
+			case in := <-w.input:
+				switch in.op {
+				case opAddWatch:
+					in.reply <- w.addWatch(in.path, uint64(in.flags))
+				case opRemoveWatch:
+					in.reply <- w.remWatch(in.path)
+				}
+			default:
+			}
+			continue
+		}
+
+		switch e {
+		case syscall.ERROR_MORE_DATA:
+			if watch == nil {
+				w.Errors <- errors.New("ERROR_MORE_DATA has unexpectedly null lpOverlapped buffer")
+			} else {
+				// The i/o succeeded but the buffer is full.
+				// In theory we should be building up a full packet.
+				// In practice we can get away with just carrying on.
+				n = uint32(unsafe.Sizeof(watch.buf))
+			}
+		case syscall.ERROR_ACCESS_DENIED:
+			// Watched directory was probably removed
+			w.sendEvent(watch.path, watch.mask&sys_FS_DELETE_SELF)
+			w.deleteWatch(watch)
+			w.startRead(watch)
+			continue
+		case syscall.ERROR_OPERATION_ABORTED:
+			// CancelIo was called on this handle
+			continue
+		default:
+			w.Errors <- os.NewSyscallError("GetQueuedCompletionPort", e)
+			continue
+		case nil:
+		}
+
+		var offset uint32
+		for {
+			if n == 0 {
+				w.Events <- newEvent("", sys_FS_Q_OVERFLOW)
+				w.Errors <- errors.New("short read in readEvents()")
+				break
+			}
+
+			// Point "raw" to the event in the buffer
+			raw := (*syscall.FileNotifyInformation)(unsafe.Pointer(&watch.buf[offset]))
+			buf := (*[syscall.MAX_PATH]uint16)(unsafe.Pointer(&raw.FileName))
+			name := syscall.UTF16ToString(buf[:raw.FileNameLength/2])
+			fullname := watch.path + "\\" + name
+
+			var mask uint64
+			switch raw.Action {
+			case syscall.FILE_ACTION_REMOVED:
+				mask = sys_FS_DELETE_SELF
+			case syscall.FILE_ACTION_MODIFIED:
+				mask = sys_FS_MODIFY
+			case syscall.FILE_ACTION_RENAMED_OLD_NAME:
+				watch.rename = name
+			case syscall.FILE_ACTION_RENAMED_NEW_NAME:
+				if watch.names[watch.rename] != 0 {
+					watch.names[name] |= watch.names[watch.rename]
+					delete(watch.names, watch.rename)
+					mask = sys_FS_MOVE_SELF
+				}
+			}
+
+			sendNameEvent := func() {
+				if w.sendEvent(fullname, watch.names[name]&mask) {
+					if watch.names[name]&sys_FS_ONESHOT != 0 {
+						delete(watch.names, name)
+					}
+				}
+			}
+			if raw.Action != syscall.FILE_ACTION_RENAMED_NEW_NAME {
+				sendNameEvent()
+			}
+			if raw.Action == syscall.FILE_ACTION_REMOVED {
+				w.sendEvent(fullname, watch.names[name]&sys_FS_IGNORED)
+				delete(watch.names, name)
+			}
+			if w.sendEvent(fullname, watch.mask&toFSnotifyFlags(raw.Action)) {
+				if watch.mask&sys_FS_ONESHOT != 0 {
+					watch.mask = 0
+				}
+			}
+			if raw.Action == syscall.FILE_ACTION_RENAMED_NEW_NAME {
+				fullname = watch.path + "\\" + watch.rename
+				sendNameEvent()
+			}
+
+			// Move to the next event in the buffer
+			if raw.NextEntryOffset == 0 {
+				break
+			}
+			offset += raw.NextEntryOffset
+
+			// Error!
+			if offset >= n {
+				w.Errors <- errors.New("Windows system assumed buffer larger than it is, events have likely been missed.")
+				break
+			}
+		}
+
+		if err := w.startRead(watch); err != nil {
+			w.Errors <- err
+		}
+	}
+}
+
+func (w *Watcher) sendEvent(name string, mask uint64) bool {
+	if mask == 0 {
+		return false
+	}
+	event := newEvent(name, uint32(mask))
+	select {
+	case ch := <-w.quit:
+		w.quit <- ch
+	case w.Events <- event:
+	}
+	return true
+}
+
+func toWindowsFlags(mask uint64) uint32 {
+	var m uint32
+	if mask&sys_FS_ACCESS != 0 {
+		m |= syscall.FILE_NOTIFY_CHANGE_LAST_ACCESS
+	}
+	if mask&sys_FS_MODIFY != 0 {
+		m |= syscall.FILE_NOTIFY_CHANGE_LAST_WRITE
+	}
+	if mask&sys_FS_ATTRIB != 0 {
+		m |= syscall.FILE_NOTIFY_CHANGE_ATTRIBUTES
+	}
+	if mask&(sys_FS_MOVE|sys_FS_CREATE|sys_FS_DELETE) != 0 {
+		m |= syscall.FILE_NOTIFY_CHANGE_FILE_NAME | syscall.FILE_NOTIFY_CHANGE_DIR_NAME
+	}
+	return m
+}
+
+func toFSnotifyFlags(action uint32) uint64 {
+	switch action {
+	case syscall.FILE_ACTION_ADDED:
+		return sys_FS_CREATE
+	case syscall.FILE_ACTION_REMOVED:
+		return sys_FS_DELETE
+	case syscall.FILE_ACTION_MODIFIED:
+		return sys_FS_MODIFY
+	case syscall.FILE_ACTION_RENAMED_OLD_NAME:
+		return sys_FS_MOVED_FROM
+	case syscall.FILE_ACTION_RENAMED_NEW_NAME:
+		return sys_FS_MOVED_TO
+	}
+	return 0
+}