watch: fix inotify tests on windows (docker#3140)

Author: nicks

pkg/watch/notify_test.go

@@ -1,5 +1,3 @@
-// +build !windows
-
 package watch
 
 import (
@@ -41,6 +39,9 @@ func TestNoWatches(t *testing.T) {
 }
 
 func TestEventOrdering(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("Skipping on windows for now")
+	}
 	f := newNotifyFixture(t)
 	defer f.tearDown()
 
@@ -73,6 +74,9 @@ func TestEventOrdering(t *testing.T) {
 // of directories, creates files in them, then deletes
 // them all quickly. Make sure there are no errors.
 func TestGitBranchSwitch(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("Skipping on windows for now")
+	}
 	f := newNotifyFixture(t)
 	defer f.tearDown()
 
@@ -143,10 +147,11 @@ func TestWatchesAreRecursive(t *testing.T) {
 	f.events = nil
 	// change sub directory
 	changeFilePath := filepath.Join(subPath, "change")
-	_, err := os.OpenFile(changeFilePath, os.O_RDONLY|os.O_CREATE, 0666)
+	h, err := os.OpenFile(changeFilePath, os.O_RDONLY|os.O_CREATE, 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
+	defer h.Close()
 
 	f.assertEvents(changeFilePath)
 }
@@ -168,10 +173,12 @@ func TestNewDirectoriesAreRecursivelyWatched(t *testing.T) {
 
 	// change something inside sub directory
 	changeFilePath := filepath.Join(subPath, "change")
-	_, err := os.OpenFile(changeFilePath, os.O_RDONLY|os.O_CREATE, 0666)
+	h, err := os.OpenFile(changeFilePath, os.O_RDONLY|os.O_CREATE, 0666)
 	if err != nil {
 		t.Fatal(err)
 	}
+	defer h.Close()
+
 	f.assertEvents(subPath, changeFilePath)
 }
 
@@ -278,6 +285,9 @@ func TestSingleFile(t *testing.T) {
 }
 
 func TestWriteBrokenLink(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("Symlink creation requires admin privileges on Windows")
+	}
 	f := newNotifyFixture(t)
 	defer f.tearDown()
 
@@ -292,6 +302,9 @@ func TestWriteBrokenLink(t *testing.T) {
 }
 
 func TestWriteGoodLink(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("Symlink creation requires admin privileges on Windows")
+	}
 	f := newNotifyFixture(t)
 	defer f.tearDown()
 
@@ -311,6 +324,9 @@ func TestWriteGoodLink(t *testing.T) {
 }
 
 func TestWatchBrokenLink(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("Symlink creation requires admin privileges on Windows")
+	}
 	f := newNotifyFixture(t)
 	defer f.tearDown()
 
@@ -339,6 +355,10 @@ func TestWatchBrokenLink(t *testing.T) {
 }
 
 func TestMoveAndReplace(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("Skipping on windows for now")
+	}
+
 	f := newNotifyFixture(t)
 	defer f.tearDown()
 

pkg/watch/watcher_naive.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"runtime"
 
 	"github.com/pkg/errors"
 	"github.com/windmilleng/fsnotify"
@@ -135,7 +136,7 @@ func (d *naiveNotify) loop() {
 	defer close(d.wrappedEvents)
 	for e := range d.events {
 		if e.Op&fsnotify.Create != fsnotify.Create {
-			if d.shouldNotify(e.Name) {
+			if d.shouldNotify(e.Name) && !isSpuriousWindowsDirChange(e) {
 				d.wrappedEvents <- FileEvent{e.Name}
 			}
 			continue
@@ -262,6 +263,22 @@ func newWatcher(paths []string, ignore PathMatcher, l logger.Logger) (*naiveNoti
 	return wmw, nil
 }
 
+// Windows' inotify implementation sometimes fires
+// of spurious WRITE events on directories when the
+// files inside change.
+func isSpuriousWindowsDirChange(e fsnotify.Event) bool {
+	if runtime.GOOS != "windows" {
+		return false
+	}
+
+	if e.Op != fsnotify.Write {
+		return false
+	}
+
+	eIsDir, _ := isDir(e.Name)
+	return eIsDir
+}
+
 func isDir(pth string) (bool, error) {
 	fi, err := os.Lstat(pth)
 	if os.IsNotExist(err) {

pkg/watch/watcher_naive_test.go

@@ -1,11 +1,12 @@
-// +build !darwin,!windows
+// +build !darwin
 
 package watch
 
 import (
 	"fmt"
 	"os"
 	"os/exec"
+	"runtime"
 	"strconv"
 	"strings"
 	"testing"
@@ -92,6 +93,9 @@ func TestDontWatchEachFile(t *testing.T) {
 	f.events = nil
 
 	pid := os.Getpid()
+	if runtime.GOOS == "windows" {
+		return // skip the inotify count
+	}
 
 	output, err := exec.Command("bash", "-c", fmt.Sprintf(
 		"find /proc/%d/fd -lname anon_inode:inotify -printf '%%hinfo/%%f\n' | xargs cat | grep -c '^inotify'", pid)).Output()