Replace godep with dep

vendor/gopkg.in/fsnotify.v1/.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,11 @@
+Before reporting an issue, please ensure you are using the latest release of fsnotify.
+
+### Which operating system (GOOS) and version are you using?
+
+Linux: lsb_release -a
+macOS: sw_vers
+Windows: systeminfo | findstr /B /C:OS
+
+### Please describe the issue that occurred.
+
+### Are you able to reproduce the issue? Please provide steps to reproduce and a code sample if possible.

vendor/gopkg.in/fsnotify.v1/.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,8 @@
+#### What does this pull request do?
+
+
+#### Where should the reviewer start?
+
+
+#### How should this be manually tested?
+

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

@@ -0,0 +1,42 @@
+// 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
+
+package fsnotify_test
+
+import (
+	"log"
+
+	"github.com/fsnotify/fsnotify"
+)
+
+func ExampleNewWatcher() {
+	watcher, err := fsnotify.NewWatcher()
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer watcher.Close()
+
+	done := make(chan bool)
+	go func() {
+		for {
+			select {
+			case event := <-watcher.Events:
+				log.Println("event:", event)
+				if event.Op&fsnotify.Write == fsnotify.Write {
+					log.Println("modified file:", event.Name)
+				}
+			case err := <-watcher.Errors:
+				log.Println("error:", err)
+			}
+		}
+	}()
+
+	err = watcher.Add("/tmp/foo")
+	if err != nil {
+		log.Fatal(err)
+	}
+	<-done
+}

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

@@ -0,0 +1,40 @@
+// Copyright 2016 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
+
+package fsnotify
+
+import "testing"
+
+func TestEventStringWithValue(t *testing.T) {
+	for opMask, expectedString := range map[Op]string{
+		Chmod | Create: `"/usr/someFile": CREATE|CHMOD`,
+		Rename:         `"/usr/someFile": RENAME`,
+		Remove:         `"/usr/someFile": REMOVE`,
+		Write | Chmod:  `"/usr/someFile": WRITE|CHMOD`,
+	} {
+		event := Event{Name: "/usr/someFile", Op: opMask}
+		if event.String() != expectedString {
+			t.Fatalf("Expected %s, got: %v", expectedString, event.String())
+		}
+
+	}
+}
+
+func TestEventOpStringWithValue(t *testing.T) {
+	expectedOpString := "WRITE|CHMOD"
+	event := Event{Name: "someFile", Op: Write | Chmod}
+	if event.Op.String() != expectedOpString {
+		t.Fatalf("Expected %s, got: %v", expectedOpString, event.Op.String())
+	}
+}
+
+func TestEventOpStringWithNoValue(t *testing.T) {
+	expectedOpString := ""
+	event := Event{Name: "testFile", Op: 0}
+	if event.Op.String() != expectedOpString {
+		t.Fatalf("Expected %s, got: %v", expectedOpString, event.Op.String())
+	}
+}

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

@@ -0,0 +1,229 @@
+// 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 (
+	"testing"
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+type testFd [2]int
+
+func makeTestFd(t *testing.T) testFd {
+	var tfd testFd
+	errno := unix.Pipe(tfd[:])
+	if errno != nil {
+		t.Fatalf("Failed to create pipe: %v", errno)
+	}
+	return tfd
+}
+
+func (tfd testFd) fd() int {
+	return tfd[0]
+}
+
+func (tfd testFd) closeWrite(t *testing.T) {
+	errno := unix.Close(tfd[1])
+	if errno != nil {
+		t.Fatalf("Failed to close write end of pipe: %v", errno)
+	}
+}
+
+func (tfd testFd) put(t *testing.T) {
+	buf := make([]byte, 10)
+	_, errno := unix.Write(tfd[1], buf)
+	if errno != nil {
+		t.Fatalf("Failed to write to pipe: %v", errno)
+	}
+}
+
+func (tfd testFd) get(t *testing.T) {
+	buf := make([]byte, 10)
+	_, errno := unix.Read(tfd[0], buf)
+	if errno != nil {
+		t.Fatalf("Failed to read from pipe: %v", errno)
+	}
+}
+
+func (tfd testFd) close() {
+	unix.Close(tfd[1])
+	unix.Close(tfd[0])
+}
+
+func makePoller(t *testing.T) (testFd, *fdPoller) {
+	tfd := makeTestFd(t)
+	poller, err := newFdPoller(tfd.fd())
+	if err != nil {
+		t.Fatalf("Failed to create poller: %v", err)
+	}
+	return tfd, poller
+}
+
+func TestPollerWithBadFd(t *testing.T) {
+	_, err := newFdPoller(-1)
+	if err != unix.EBADF {
+		t.Fatalf("Expected EBADF, got: %v", err)
+	}
+}
+
+func TestPollerWithData(t *testing.T) {
+	tfd, poller := makePoller(t)
+	defer tfd.close()
+	defer poller.close()
+
+	tfd.put(t)
+	ok, err := poller.wait()
+	if err != nil {
+		t.Fatalf("poller failed: %v", err)
+	}
+	if !ok {
+		t.Fatalf("expected poller to return true")
+	}
+	tfd.get(t)
+}
+
+func TestPollerWithWakeup(t *testing.T) {
+	tfd, poller := makePoller(t)
+	defer tfd.close()
+	defer poller.close()
+
+	err := poller.wake()
+	if err != nil {
+		t.Fatalf("wake failed: %v", err)
+	}
+	ok, err := poller.wait()
+	if err != nil {
+		t.Fatalf("poller failed: %v", err)
+	}
+	if ok {
+		t.Fatalf("expected poller to return false")
+	}
+}
+
+func TestPollerWithClose(t *testing.T) {
+	tfd, poller := makePoller(t)
+	defer tfd.close()
+	defer poller.close()
+
+	tfd.closeWrite(t)
+	ok, err := poller.wait()
+	if err != nil {
+		t.Fatalf("poller failed: %v", err)
+	}
+	if !ok {
+		t.Fatalf("expected poller to return true")
+	}
+}
+
+func TestPollerWithWakeupAndData(t *testing.T) {
+	tfd, poller := makePoller(t)
+	defer tfd.close()
+	defer poller.close()
+
+	tfd.put(t)
+	err := poller.wake()
+	if err != nil {
+		t.Fatalf("wake failed: %v", err)
+	}
+
+	// both data and wakeup
+	ok, err := poller.wait()
+	if err != nil {
+		t.Fatalf("poller failed: %v", err)
+	}
+	if !ok {
+		t.Fatalf("expected poller to return true")
+	}
+
+	// data is still in the buffer, wakeup is cleared
+	ok, err = poller.wait()
+	if err != nil {
+		t.Fatalf("poller failed: %v", err)
+	}
+	if !ok {
+		t.Fatalf("expected poller to return true")
+	}
+
+	tfd.get(t)
+	// data is gone, only wakeup now
+	err = poller.wake()
+	if err != nil {
+		t.Fatalf("wake failed: %v", err)
+	}
+	ok, err = poller.wait()
+	if err != nil {
+		t.Fatalf("poller failed: %v", err)
+	}
+	if ok {
+		t.Fatalf("expected poller to return false")
+	}
+}
+
+func TestPollerConcurrent(t *testing.T) {
+	tfd, poller := makePoller(t)
+	defer tfd.close()
+	defer poller.close()
+
+	oks := make(chan bool)
+	live := make(chan bool)
+	defer close(live)
+	go func() {
+		defer close(oks)
+		for {
+			ok, err := poller.wait()
+			if err != nil {
+				t.Fatalf("poller failed: %v", err)
+			}
+			oks <- ok
+			if !<-live {
+				return
+			}
+		}
+	}()
+
+	// Try a write
+	select {
+	case <-time.After(50 * time.Millisecond):
+	case <-oks:
+		t.Fatalf("poller did not wait")
+	}
+	tfd.put(t)
+	if !<-oks {
+		t.Fatalf("expected true")
+	}
+	tfd.get(t)
+	live <- true
+
+	// Try a wakeup
+	select {
+	case <-time.After(50 * time.Millisecond):
+	case <-oks:
+		t.Fatalf("poller did not wait")
+	}
+	err := poller.wake()
+	if err != nil {
+		t.Fatalf("wake failed: %v", err)
+	}
+	if <-oks {
+		t.Fatalf("expected false")
+	}
+	live <- true
+
+	// Try a close
+	select {
+	case <-time.After(50 * time.Millisecond):
+	case <-oks:
+		t.Fatalf("poller did not wait")
+	}
+	tfd.closeWrite(t)
+	if !<-oks {
+		t.Fatalf("expected true")
+	}
+	tfd.get(t)
+}

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

@@ -0,0 +1,360 @@
+// 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 (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestInotifyCloseRightAway(t *testing.T) {
+	w, err := NewWatcher()
+	if err != nil {
+		t.Fatalf("Failed to create watcher")
+	}
+
+	// Close immediately; it won't even reach the first unix.Read.
+	w.Close()
+
+	// Wait for the close to complete.
+	<-time.After(50 * time.Millisecond)
+	isWatcherReallyClosed(t, w)
+}
+
+func TestInotifyCloseSlightlyLater(t *testing.T) {
+	w, err := NewWatcher()
+	if err != nil {
+		t.Fatalf("Failed to create watcher")
+	}
+
+	// Wait until readEvents has reached unix.Read, and Close.
+	<-time.After(50 * time.Millisecond)
+	w.Close()
+
+	// Wait for the close to complete.
+	<-time.After(50 * time.Millisecond)
+	isWatcherReallyClosed(t, w)
+}
+
+func TestInotifyCloseSlightlyLaterWithWatch(t *testing.T) {
+	testDir := tempMkdir(t)
+	defer os.RemoveAll(testDir)
+
+	w, err := NewWatcher()
+	if err != nil {
+		t.Fatalf("Failed to create watcher")
+	}
+	w.Add(testDir)
+
+	// Wait until readEvents has reached unix.Read, and Close.
+	<-time.After(50 * time.Millisecond)
+	w.Close()
+
+	// Wait for the close to complete.
+	<-time.After(50 * time.Millisecond)
+	isWatcherReallyClosed(t, w)
+}
+
+func TestInotifyCloseAfterRead(t *testing.T) {
+	testDir := tempMkdir(t)
+	defer os.RemoveAll(testDir)
+
+	w, err := NewWatcher()
+	if err != nil {
+		t.Fatalf("Failed to create watcher")
+	}
+
+	err = w.Add(testDir)
+	if err != nil {
+		t.Fatalf("Failed to add .")
+	}
+
+	// Generate an event.
+	os.Create(filepath.Join(testDir, "somethingSOMETHINGsomethingSOMETHING"))
+
+	// Wait for readEvents to read the event, then close the watcher.
+	<-time.After(50 * time.Millisecond)
+	w.Close()
+
+	// Wait for the close to complete.
+	<-time.After(50 * time.Millisecond)
+	isWatcherReallyClosed(t, w)
+}
+
+func isWatcherReallyClosed(t *testing.T, w *Watcher) {
+	select {
+	case err, ok := <-w.Errors:
+		if ok {
+			t.Fatalf("w.Errors is not closed; readEvents is still alive after closing (error: %v)", err)
+		}
+	default:
+		t.Fatalf("w.Errors would have blocked; readEvents is still alive!")
+	}
+
+	select {
+	case _, ok := <-w.Events:
+		if ok {
+			t.Fatalf("w.Events is not closed; readEvents is still alive after closing")
+		}
+	default:
+		t.Fatalf("w.Events would have blocked; readEvents is still alive!")
+	}
+}
+
+func TestInotifyCloseCreate(t *testing.T) {
+	testDir := tempMkdir(t)
+	defer os.RemoveAll(testDir)
+
+	w, err := NewWatcher()
+	if err != nil {
+		t.Fatalf("Failed to create watcher: %v", err)
+	}
+	defer w.Close()
+
+	err = w.Add(testDir)
+	if err != nil {
+		t.Fatalf("Failed to add testDir: %v", err)
+	}
+	h, err := os.Create(filepath.Join(testDir, "testfile"))
+	if err != nil {
+		t.Fatalf("Failed to create file in testdir: %v", err)
+	}
+	h.Close()
+	select {
+	case _ = <-w.Events:
+	case err := <-w.Errors:
+		t.Fatalf("Error from watcher: %v", err)
+	case <-time.After(50 * time.Millisecond):
+		t.Fatalf("Took too long to wait for event")
+	}
+
+	// At this point, we've received one event, so the goroutine is ready.
+	// It's also blocking on unix.Read.
+	// Now we try to swap the file descriptor under its nose.
+	w.Close()
+	w, err = NewWatcher()
+	defer w.Close()
+	if err != nil {
+		t.Fatalf("Failed to create second watcher: %v", err)
+	}
+
+	<-time.After(50 * time.Millisecond)
+	err = w.Add(testDir)
+	if err != nil {
+		t.Fatalf("Error adding testDir again: %v", err)
+	}
+}
+
+// This test verifies the watcher can keep up with file creations/deletions
+// when under load.
+func TestInotifyStress(t *testing.T) {
+	maxNumToCreate := 1000
+
+	testDir := tempMkdir(t)
+	defer os.RemoveAll(testDir)
+	testFilePrefix := filepath.Join(testDir, "testfile")
+
+	w, err := NewWatcher()
+	if err != nil {
+		t.Fatalf("Failed to create watcher: %v", err)
+	}
+	defer w.Close()
+
+	err = w.Add(testDir)
+	if err != nil {
+		t.Fatalf("Failed to add testDir: %v", err)
+	}
+
+	doneChan := make(chan struct{})
+	// The buffer ensures that the file generation goroutine is never blocked.
+	errChan := make(chan error, 2*maxNumToCreate)
+
+	go func() {
+		for i := 0; i < maxNumToCreate; i++ {
+			testFile := fmt.Sprintf("%s%d", testFilePrefix, i)
+
+			handle, err := os.Create(testFile)
+			if err != nil {
+				errChan <- fmt.Errorf("Create failed: %v", err)
+				continue
+			}
+
+			err = handle.Close()
+			if err != nil {
+				errChan <- fmt.Errorf("Close failed: %v", err)
+				continue
+			}
+		}
+
+		// If we delete a newly created file too quickly, inotify will skip the
+		// create event and only send the delete event.
+		time.Sleep(100 * time.Millisecond)
+
+		for i := 0; i < maxNumToCreate; i++ {
+			testFile := fmt.Sprintf("%s%d", testFilePrefix, i)
+			err = os.Remove(testFile)
+			if err != nil {
+				errChan <- fmt.Errorf("Remove failed: %v", err)
+			}
+		}
+
+		close(doneChan)
+	}()
+
+	creates := 0
+	removes := 0
+
+	finished := false
+	after := time.After(10 * time.Second)
+	for !finished {
+		select {
+		case <-after:
+			t.Fatalf("Not done")
+		case <-doneChan:
+			finished = true
+		case err := <-errChan:
+			t.Fatalf("Got an error from file creator goroutine: %v", err)
+		case err := <-w.Errors:
+			t.Fatalf("Got an error from watcher: %v", err)
+		case evt := <-w.Events:
+			if !strings.HasPrefix(evt.Name, testFilePrefix) {
+				t.Fatalf("Got an event for an unknown file: %s", evt.Name)
+			}
+			if evt.Op == Create {
+				creates++
+			}
+			if evt.Op == Remove {
+				removes++
+			}
+		}
+	}
+
+	// Drain remaining events from channels
+	count := 0
+	for count < 10 {
+		select {
+		case err := <-errChan:
+			t.Fatalf("Got an error from file creator goroutine: %v", err)
+		case err := <-w.Errors:
+			t.Fatalf("Got an error from watcher: %v", err)
+		case evt := <-w.Events:
+			if !strings.HasPrefix(evt.Name, testFilePrefix) {
+				t.Fatalf("Got an event for an unknown file: %s", evt.Name)
+			}
+			if evt.Op == Create {
+				creates++
+			}
+			if evt.Op == Remove {
+				removes++
+			}
+			count = 0
+		default:
+			count++
+			// Give the watcher chances to fill the channels.
+			time.Sleep(time.Millisecond)
+		}
+	}
+
+	if creates-removes > 1 || creates-removes < -1 {
+		t.Fatalf("Creates and removes should not be off by more than one: %d creates, %d removes", creates, removes)
+	}
+	if creates < 50 {
+		t.Fatalf("Expected at least 50 creates, got %d", creates)
+	}
+}
+
+func TestInotifyRemoveTwice(t *testing.T) {
+	testDir := tempMkdir(t)
+	defer os.RemoveAll(testDir)
+	testFile := filepath.Join(testDir, "testfile")
+
+	handle, err := os.Create(testFile)
+	if err != nil {
+		t.Fatalf("Create failed: %v", err)
+	}
+	handle.Close()
+
+	w, err := NewWatcher()
+	if err != nil {
+		t.Fatalf("Failed to create watcher: %v", err)
+	}
+	defer w.Close()
+
+	err = w.Add(testFile)
+	if err != nil {
+		t.Fatalf("Failed to add testFile: %v", err)
+	}
+
+	err = os.Remove(testFile)
+	if err != nil {
+		t.Fatalf("Failed to remove testFile: %v", err)
+	}
+
+	err = w.Remove(testFile)
+	if err == nil {
+		t.Fatalf("no error on removing invalid file")
+	}
+	s1 := fmt.Sprintf("%s", err)
+
+	err = w.Remove(testFile)
+	if err == nil {
+		t.Fatalf("no error on removing invalid file")
+	}
+	s2 := fmt.Sprintf("%s", err)
+
+	if s1 != s2 {
+		t.Fatalf("receive different error - %s / %s", s1, s2)
+	}
+}
+
+func TestInotifyInnerMapLength(t *testing.T) {
+	testDir := tempMkdir(t)
+	defer os.RemoveAll(testDir)
+	testFile := filepath.Join(testDir, "testfile")
+
+	handle, err := os.Create(testFile)
+	if err != nil {
+		t.Fatalf("Create failed: %v", err)
+	}
+	handle.Close()
+
+	w, err := NewWatcher()
+	if err != nil {
+		t.Fatalf("Failed to create watcher: %v", err)
+	}
+	defer w.Close()
+
+	err = w.Add(testFile)
+	if err != nil {
+		t.Fatalf("Failed to add testFile: %v", err)
+	}
+	go func() {
+		for err := range w.Errors {
+			t.Fatalf("error received: %s", err)
+		}
+	}()
+
+	err = os.Remove(testFile)
+	if err != nil {
+		t.Fatalf("Failed to remove testFile: %v", err)
+	}
+	_ = <-w.Events                      // consume Remove event
+	<-time.After(50 * time.Millisecond) // wait IN_IGNORE propagated
+
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	if len(w.watches) != 0 {
+		t.Fatalf("Expected watches len is 0, but got: %d, %v", len(w.watches), w.watches)
+	}
+	if len(w.paths) != 0 {
+		t.Fatalf("Expected paths len is 0, but got: %d, %v", len(w.paths), w.paths)
+	}
+}

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

@@ -0,0 +1,147 @@
+// Copyright 2016 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.
+
+package fsnotify
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+// testExchangedataForWatcher tests the watcher with the exchangedata operation on OS X.
+//
+// This is widely used for atomic saves on OS X, e.g. TextMate and in Apple's NSDocument.
+//
+// See https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man2/exchangedata.2.html
+// Also see: https://github.com/textmate/textmate/blob/cd016be29489eba5f3c09b7b70b06da134dda550/Frameworks/io/src/swap_file_data.cc#L20
+func testExchangedataForWatcher(t *testing.T, watchDir bool) {
+	// Create directory to watch
+	testDir1 := tempMkdir(t)
+
+	// For the intermediate file
+	testDir2 := tempMkdir(t)
+
+	defer os.RemoveAll(testDir1)
+	defer os.RemoveAll(testDir2)
+
+	resolvedFilename := "TestFsnotifyEvents.file"
+
+	// TextMate does:
+	//
+	// 1. exchangedata (intermediate, resolved)
+	// 2. unlink intermediate
+	//
+	// Let's try to simulate that:
+	resolved := filepath.Join(testDir1, resolvedFilename)
+	intermediate := filepath.Join(testDir2, resolvedFilename+"~")
+
+	// Make sure we create the file before we start watching
+	createAndSyncFile(t, resolved)
+
+	watcher := newWatcher(t)
+
+	// Test both variants in isolation
+	if watchDir {
+		addWatch(t, watcher, testDir1)
+	} else {
+		addWatch(t, watcher, resolved)
+	}
+
+	// Receive errors on the error channel on a separate goroutine
+	go func() {
+		for err := range watcher.Errors {
+			t.Fatalf("error received: %s", err)
+		}
+	}()
+
+	// Receive events on the event channel on a separate goroutine
+	eventstream := watcher.Events
+	var removeReceived counter
+	var createReceived counter
+
+	done := make(chan bool)
+
+	go func() {
+		for event := range eventstream {
+			// Only count relevant events
+			if event.Name == filepath.Clean(resolved) {
+				if event.Op&Remove == Remove {
+					removeReceived.increment()
+				}
+				if event.Op&Create == Create {
+					createReceived.increment()
+				}
+			}
+			t.Logf("event received: %s", event)
+		}
+		done <- true
+	}()
+
+	// Repeat to make sure the watched file/directory "survives" the REMOVE/CREATE loop.
+	for i := 1; i <= 3; i++ {
+		// The intermediate file is created in a folder outside the watcher
+		createAndSyncFile(t, intermediate)
+
+		// 1. Swap
+		if err := unix.Exchangedata(intermediate, resolved, 0); err != nil {
+			t.Fatalf("[%d] exchangedata failed: %s", i, err)
+		}
+
+		time.Sleep(50 * time.Millisecond)
+
+		// 2. Delete the intermediate file
+		err := os.Remove(intermediate)
+
+		if err != nil {
+			t.Fatalf("[%d] remove %s failed: %s", i, intermediate, err)
+		}
+
+		time.Sleep(50 * time.Millisecond)
+
+	}
+
+	// We expect this event to be received almost immediately, but let's wait 500 ms to be sure
+	time.Sleep(500 * time.Millisecond)
+
+	// The events will be (CHMOD + REMOVE + CREATE) X 2. Let's focus on the last two:
+	if removeReceived.value() < 3 {
+		t.Fatal("fsnotify remove events have not been received after 500 ms")
+	}
+
+	if createReceived.value() < 3 {
+		t.Fatal("fsnotify create events have not been received after 500 ms")
+	}
+
+	watcher.Close()
+	t.Log("waiting for the event channel to become closed...")
+	select {
+	case <-done:
+		t.Log("event channel closed")
+	case <-time.After(2 * time.Second):
+		t.Fatal("event stream was not closed after 2 seconds")
+	}
+}
+
+// TestExchangedataInWatchedDir test exchangedata operation on file in watched dir.
+func TestExchangedataInWatchedDir(t *testing.T) {
+	testExchangedataForWatcher(t, true)
+}
+
+// TestExchangedataInWatchedDir test exchangedata operation on watched file.
+func TestExchangedataInWatchedFile(t *testing.T) {
+	testExchangedataForWatcher(t, false)
+}
+
+func createAndSyncFile(t *testing.T, filepath string) {
+	f1, err := os.OpenFile(filepath, os.O_WRONLY|os.O_CREATE, 0666)
+	if err != nil {
+		t.Fatalf("creating %s failed: %s", filepath, err)
+	}
+	f1.Sync()
+	f1.Close()
+}