github.com/keybase/client/go@v0.0.0-20240309051027-028f7c731f8b/kbfs/libfuse/mount_test.go

// Copyright 2016 Keybase Inc. All rights reserved.
// Use of this source code is governed by a BSD
// license that can be found in the LICENSE file.
//
//go:build !windows
// +build !windows

package libfuse

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"os"
	"os/exec"
	"path"
	"reflect"
	"runtime"
	"strconv"
	"strings"
	"syscall"
	"testing"
	"time"

	"bazil.org/fuse"
	"bazil.org/fuse/fs"
	"bazil.org/fuse/fs/fstestutil"
	"github.com/keybase/client/go/kbfs/ioutil"
	"github.com/keybase/client/go/kbfs/libcontext"
	"github.com/keybase/client/go/kbfs/libfs"
	"github.com/keybase/client/go/kbfs/libkbfs"
	"github.com/keybase/client/go/kbfs/test/clocktest"
	"github.com/keybase/client/go/kbfs/tlf"
	kbname "github.com/keybase/client/go/kbun"
	"github.com/keybase/client/go/logger"
	"github.com/keybase/client/go/protocol/keybase1"
	"github.com/pkg/errors"
	"github.com/stretchr/testify/require"
	"golang.org/x/net/context"
	"golang.org/x/sys/unix"
)

func makeFS(ctx context.Context, t testing.TB, config *libkbfs.ConfigLocal) (
	*fstestutil.Mount, *FS, func()) {
	log := logger.NewTestLogger(t)
	debugLog := log.CloneWithAddedDepth(1)
	fuse.Debug = MakeFuseDebugFn(debugLog, false /* superVerbose */)

	// TODO duplicates main() in kbfsfuse/main.go too much
	filesys := &FS{
		config:        config,
		log:           log,
		vlog:          config.MakeVLogger(log),
		errLog:        log,
		errVlog:       config.MakeVLogger(log),
		notifications: libfs.NewFSNotifications(log),
		root:          NewRoot(),
	}
	filesys.root.private = &FolderList{
		fs:      filesys,
		tlfType: tlf.Private,
		folders: make(map[string]*TLF),
	}
	filesys.root.public = &FolderList{
		fs:      filesys,
		tlfType: tlf.Public,
		folders: make(map[string]*TLF),
	}
	filesys.root.team = &FolderList{
		fs:      filesys,
		tlfType: tlf.SingleTeam,
		folders: make(map[string]*TLF),
	}
	filesys.execAfterDelay = func(d time.Duration, f func()) {
		time.AfterFunc(d, f)
	}
	fn := func(mnt *fstestutil.Mount) fs.FS {
		filesys.fuse = mnt.Server
		filesys.conn = mnt.Conn
		return filesys
	}
	options := GetPlatformSpecificMountOptionsForTest()
	mnt, err := fstestutil.MountedFuncT(t, fn, &fs.Config{
		WithContext: func(ctx context.Context, req fuse.Request) context.Context {
			return filesys.WithContext(ctx)
		},
	}, options...)
	if err != nil {
		t.Fatal(err)
	}
	// the cancelFn returned will cancel notification processing; the
	// FUSE serve loop is terminated by unmounting the filesystem
	ctx = context.WithValue(ctx, libfs.CtxAppIDKey, filesys)
	ctx, cancelFn := context.WithCancel(ctx)
	filesys.LaunchNotificationProcessor(ctx)
	return mnt, filesys, func() {
		cancelFn()
	}
}

type fileInfoCheck func(fi os.FileInfo) error

func mustBeFileWithSize(fi os.FileInfo, size int64) error {
	if fi.Size() != size {
		return fmt.Errorf("Bad file size: %d", fi.Size())
	}
	return nil
}

func mustBeDir(fi os.FileInfo) error {
	if !fi.IsDir() {
		return fmt.Errorf("not a directory: %v", fi)
	}
	return nil
}

func checkDirNoTestError(
	t testing.TB, dir string, want map[string]fileInfoCheck) error {
	// make a copy of want, to be safe
	{
		tmp := make(map[string]fileInfoCheck, len(want))
		for k, v := range want {
			tmp[k] = v
		}
		want = tmp
	}

	fis, err := ioutil.ReadDir(dir)
	if err != nil {
		t.Fatal(err)
	}
	for _, fi := range fis {
		if check, ok := want[fi.Name()]; ok {
			delete(want, fi.Name())
			if check != nil {
				if err := check(fi); err != nil {
					return fmt.Errorf("check failed: %v: %v", fi.Name(), err)
				}
			}
			continue
		}
		return fmt.Errorf("unexpected direntry: %q size=%v mode=%v",
			fi.Name(), fi.Size(), fi.Mode())
	}
	for filename := range want {
		return fmt.Errorf("never saw file: %v", filename)
	}
	return nil
}

func checkDir(t testing.TB, dir string, want map[string]fileInfoCheck) {
	err := checkDirNoTestError(t, dir, want)
	if err != nil {
		t.Error(err)
	}
}

// timeEqualFuzzy returns whether a is b+-skew.
func timeEqualFuzzy(a, b time.Time, skew time.Duration) bool {
	b1 := b.Add(-skew)
	b2 := b.Add(skew)
	return !a.Before(b1) && !a.After(b2)
}

func testCleanupDelayer(ctx context.Context, t *testing.T) {
	err := libcontext.CleanupCancellationDelayer(ctx)
	require.NoError(t, err)
}

func TestStatRoot(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	fi, err := ioutil.Lstat(mnt.Dir)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.Mode().String(), `dr-x------`; g != e {
		t.Errorf("wrong mode for folder: %q != %q", g, e)
	}
}

func TestStatPrivate(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	fi, err := ioutil.Lstat(path.Join(mnt.Dir, PrivateName))
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.Mode().String(), `dr-x------`; g != e {
		t.Errorf("wrong mode for folder: %q != %q", g, e)
	}
}

func TestStatPublic(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	fi, err := ioutil.Lstat(path.Join(mnt.Dir, PublicName))
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.Mode().String(), `dr-x------`; g != e {
		t.Errorf("wrong mode for folder: %q != %q", g, e)
	}
}

func TestStatMyFolder(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	// Access the tlf once to have the *Dir populated in tlf.go
	if err := ioutil.Mkdir(
		path.Join(mnt.Dir, PrivateName, "jdoe", "d"), os.ModeDir); err != nil {
		t.Fatal(err)
	}

	fi, err := ioutil.Lstat(path.Join(mnt.Dir, PrivateName, "jdoe"))
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.Mode().String(), `drwx------`; g != e {
		t.Errorf("wrong mode for folder: %q != %q", g, e)
	}
}

func TestStatNonexistentFolder(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	if _, err := ioutil.Lstat(path.Join(mnt.Dir, PrivateName, "does-not-exist")); !ioutil.IsNotExist(err) {
		t.Fatalf("expected ENOENT: %v", err)
	}
}

func TestStatAlias(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe,jdoe")
	fi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.Mode().String(), `Lrwxrwxrwx`; g != e {
		t.Errorf("wrong mode for alias : %q != %q", g, e)
	}
	target, err := os.Readlink(p)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := target, "jdoe"; g != e {
		t.Errorf("wrong alias symlink target: %q != %q", g, e)
	}
}

// Test that we can determine a normalized alias without any identify
// calls (regression test for KBFS-531).
func TestStatAliasCausesNoIdentifies(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)

	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PublicName, "HEAD")
	// Even though "head" is not a real user in our config, this stat
	// should succeed because no identify calls should be triggered.
	fi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.Mode().String(), `Lrwxrwxrwx`; g != e {
		t.Errorf("wrong mode for alias : %q != %q", g, e)
	}
	target, err := os.Readlink(p)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := target, "head"; g != e {
		t.Errorf("wrong alias symlink target: %q != %q", g, e)
	}
}

func TestStatInvalidAliasFails(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)

	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PublicName, "HEAD.JPG")
	// This should fail as HEAD.JPG has the wrong format.
	_, err := ioutil.Lstat(p)
	if err == nil {
		t.Fatal("Lstat of HEAD.JPG didn't return an error!")
	}
}

func TestRemoveAlias(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe,jdoe")
	err := ioutil.Remove(p)
	if err != nil {
		t.Fatalf("Removing alias failed: %v", err)
	}
}

func TestStatMyPublic(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	// Access the tlf once to have the *Dir populated in tlf.go
	if err := ioutil.Mkdir(
		path.Join(mnt.Dir, PublicName, "jdoe", "d"), os.ModeDir); err != nil {
		t.Fatal(err)
	}

	fi, err := ioutil.Lstat(path.Join(mnt.Dir, PublicName, "jdoe"))
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.Mode().String(), `drwx------`; g != e {
		t.Errorf("wrong mode for folder: %q != %q", g, e)
	}
}

func TestReaddirRoot(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	checkDir(t, mnt.Dir, map[string]fileInfoCheck{
		PrivateName: mustBeDir,
		PublicName:  mustBeDir,
		TeamName:    mustBeDir,
	})
}

func TestReaddirPrivate(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "janedoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	{
		ctx := libcontext.BackgroundContextWithCancellationDelayer()
		defer testCleanupDelayer(ctx, t)
		// Force FakeMDServer to have some TlfIDs it can present to us
		// as favorites. Don't go through VFS to avoid caching causing
		// false positives.
		libkbfs.GetRootNodeOrBust(ctx, t, config, "janedoe,jdoe", tlf.Private)
		libkbfs.GetRootNodeOrBust(ctx, t, config, "janedoe,jdoe", tlf.Public)
	}

	checkDir(t, path.Join(mnt.Dir, PrivateName), map[string]fileInfoCheck{
		"jdoe,janedoe": mustBeDir,
		"jdoe":         mustBeDir, // default home directory
	})
}

func TestReaddirPrivateDeleteAndReaddFavorite(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "janedoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, fs, cancelFn := makeFS(ctx, t, config)
	fs.execAfterDelay = func(d time.Duration, f func()) {
		// this causes the entry added to fl.recentlyRemoved (in
		// addToRecentlyRemove) to be removed instantly. this way we can avoid
		// adding delays in tests.
		f()
	}
	defer mnt.Close()
	defer cancelFn()

	{
		ctx := libcontext.BackgroundContextWithCancellationDelayer()
		defer testCleanupDelayer(ctx, t)
		// Force FakeMDServer to have some TlfIDs it can present to us
		// as favorites. Don't go through VFS to avoid caching causing
		// false positives.
		libkbfs.GetRootNodeOrBust(ctx, t, config, "janedoe,jdoe", tlf.Private)
		libkbfs.GetRootNodeOrBust(ctx, t, config, "janedoe,jdoe", tlf.Public)
	}

	err := ioutil.Remove(path.Join(mnt.Dir, PrivateName, "jdoe,janedoe"))
	if err != nil {
		t.Fatalf("Removing favorite failed: %v", err)
	}

	checkDir(t, path.Join(mnt.Dir, PrivateName), map[string]fileInfoCheck{
		"jdoe": mustBeDir, // default home directory
	})

	// Re-add the favorite by doing a readdir
	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe,janedoe"),
		map[string]fileInfoCheck{})

	checkDir(t, path.Join(mnt.Dir, PrivateName), map[string]fileInfoCheck{
		"jdoe,janedoe": mustBeDir,
		"jdoe":         mustBeDir, // default home directory
	})
}

func TestReaddirPublic(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "janedoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	{
		ctx := libcontext.BackgroundContextWithCancellationDelayer()
		defer testCleanupDelayer(ctx, t)
		// Force FakeMDServer to have some TlfIDs it can present to us
		// as favorites. Don't go through VFS to avoid caching causing
		// false positives.
		libkbfs.GetRootNodeOrBust(ctx, t, config, "janedoe,jdoe", tlf.Private)
		libkbfs.GetRootNodeOrBust(ctx, t, config, "janedoe,jdoe", tlf.Public)
	}

	checkDir(t, path.Join(mnt.Dir, PublicName), map[string]fileInfoCheck{
		"jdoe,janedoe": mustBeDir,
		"jdoe":         mustBeDir, // default personal public directory
	})
}

type kbserviceBrokenIdentify struct {
	libkbfs.KeybaseService
}

func (k kbserviceBrokenIdentify) Identify(
	ctx context.Context, assertion, reason string,
	_ keybase1.OfflineAvailability) (
	kbname.NormalizedUsername, keybase1.UserOrTeamID, error) {
	return kbname.NormalizedUsername(""), keybase1.UserOrTeamID(""),
		errors.New("Fake identify error")
}

// Regression test for KBFS-772 on OSX.  (There's a bug where ls only
// respects errors from Open, not from ReadDirAll.)
func TestReaddirPublicFailedIdentifyViaOSCall(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config1 := libkbfs.MakeTestConfigOrBust(t, "u1", "u2")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config1)
	mnt1, _, cancelFn1 := makeFS(ctx, t, config1)
	defer mnt1.Close()
	defer cancelFn1()

	config2 := libkbfs.ConfigAsUser(config1, "u2")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config2)
	mnt2, _, cancelFn2 := makeFS(ctx, t, config2)
	defer mnt2.Close()
	defer cancelFn2()

	// Create a shared folder via u2.
	p := path.Join(mnt2.Dir, PrivateName, "u1,u2", "mydir")
	if err := ioutil.Mkdir(p, 0755); err != nil {
		t.Fatal(err)
	}

	// Make u1 get failures for every identify call.
	config1.SetKeybaseService(kbserviceBrokenIdentify{
		KeybaseService: config1.KeybaseService(),
	})

	// A private non-existing home folder, with write permissions, fails.
	err := exec.Command("ls", path.Join(mnt1.Dir, PublicName, "u1")).Run()
	if _, ok := err.(*exec.ExitError); !ok {
		t.Fatalf("No error as expected on broken user identify: %v", err)
	}

	// A private existing shared folder, with write permissions, fails.
	err = exec.Command("ls", path.Join(mnt1.Dir, PrivateName, "u1,u2")).Run()
	if _, ok := err.(*exec.ExitError); !ok {
		t.Fatalf("No error as expected on broken user identify: %v", err)
	}

	// A public, non-existing folder, without write permissions, fails.
	err = exec.Command("ls", path.Join(mnt1.Dir, PublicName, "u2")).Run()
	if _, ok := err.(*exec.ExitError); !ok {
		t.Fatalf("No error as expected on broken user identify: %v", err)
	}
}

func TestReaddirMyFolderEmpty(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe"), map[string]fileInfoCheck{})
}

func syncAll(t *testing.T, tlf string, ty tlf.Type, fs *FS) {
	// golang doesn't let us sync on a directory handle, so if we need
	// to sync all without a file, go through libkbfs directly.
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	root := libkbfs.GetRootNodeOrBust(ctx, t, fs.config, tlf, ty)
	err := fs.config.KBFSOps().SyncAll(ctx, root.GetFolderBranch())
	if err != nil {
		t.Fatalf("Couldn't sync all: %v", err)
	}
}

func syncAndClose(t *testing.T, f *os.File) {
	if f == nil {
		return
	}
	err := f.Sync()
	if err != nil {
		t.Fatal(err)
	}
	f.Close()
}

func syncFilename(t *testing.T, name string) {
	f, err := os.OpenFile(name, os.O_WRONLY, 0644)
	if err != nil {
		t.Fatal(err)
	}
	syncAndClose(t, f)
}

func TestReaddirMyFolderWithFiles(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	files := map[string]fileInfoCheck{
		"one": nil,
		"two": nil,
	}
	for filename, check := range files {
		if check != nil {
			// only set up the files
			continue
		}
		p := path.Join(mnt.Dir, PrivateName, "jdoe", filename)
		if err := ioutil.WriteFile(
			p, []byte("data for "+filename), 0644); err != nil {
			t.Fatal(err)
		}
		syncFilename(t, p)
	}
	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe"), files)
}

func testOneCreateThenRead(t *testing.T, p string) {
	f, err := os.Create(p)
	if err != nil {
		t.Fatal(err)
	}
	// Call in a closure since `f` is overridden below.
	defer func() { syncAndClose(t, f) }()
	const input = "hello, world\n"
	if _, err := io.WriteString(f, input); err != nil {
		t.Fatalf("write error: %v", err)
	}
	syncAndClose(t, f)
	f = nil

	buf, err := ioutil.ReadFile(p)
	if err != nil {
		t.Fatalf("read error: %v", err)
	}
	if g, e := string(buf), input; g != e {
		t.Errorf("bad file contents: %q != %q", g, e)
	}
}

func TestCreateThenRead(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	testOneCreateThenRead(t, p)
}

// Tests that writing and reading multiple files works, implicitly
// exercising any block pointer reference counting code (since the
// initial created files will have identical empty blocks to start
// with).
func TestMultipleCreateThenRead(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p1 := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile1")
	testOneCreateThenRead(t, p1)
	p2 := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile2")
	testOneCreateThenRead(t, p2)
}

func TestReadUnflushed(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	f, err := os.Create(p)
	if err != nil {
		t.Fatal(err)
	}
	defer syncAndClose(t, f)
	const input = "hello, world\n"
	if _, err := io.WriteString(f, input); err != nil {
		t.Fatalf("write error: %v", err)
	}
	// explicitly no close here

	buf, err := ioutil.ReadFile(p)
	if err != nil {
		t.Fatalf("read error: %v", err)
	}
	if g, e := string(buf), input; g != e {
		t.Errorf("bad file contents: %q != %q", g, e)
	}
}

func TestMountAgain(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)

	const input = "hello, world\n"
	const filename = "myfile"
	func() {
		mnt, _, cancelFn := makeFS(ctx, t, config)
		defer mnt.Close()
		defer cancelFn()

		p := path.Join(mnt.Dir, PrivateName, "jdoe", filename)
		if err := ioutil.WriteFile(p, []byte(input), 0644); err != nil {
			t.Fatal(err)
		}
		syncFilename(t, p)
	}()

	func() {
		mnt, _, cancelFn := makeFS(ctx, t, config)
		defer mnt.Close()
		defer cancelFn()
		p := path.Join(mnt.Dir, PrivateName, "jdoe", filename)
		buf, err := ioutil.ReadFile(p)
		if err != nil {
			t.Fatalf("read error: %v", err)
		}
		if g, e := string(buf), input; g != e {
			t.Errorf("bad file contents: %q != %q", g, e)
		}
	}()
}

func TestCreateExecutable(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	if err := ioutil.WriteFile(p, []byte("fake binary"), 0755); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)
	fi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.Mode().String(), `-rwx------`; g != e {
		t.Errorf("wrong mode for executable: %q != %q", g, e)
	}
}

func TestMkdir(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "mydir")
	if err := ioutil.Mkdir(p, 0755); err != nil {
		t.Fatal(err)
	}
	fi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.Mode().String(), `drwx------`; g != e {
		t.Errorf("wrong mode for subdir: %q != %q", g, e)
	}
}

func TestMkdirAndCreateDeep(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	const input = "hello, world\n"

	func() {
		mnt, _, cancelFn := makeFS(ctx, t, config)
		defer mnt.Close()
		defer cancelFn()

		one := path.Join(mnt.Dir, PrivateName, "jdoe", "one")
		if err := ioutil.Mkdir(one, 0755); err != nil {
			t.Fatal(err)
		}
		two := path.Join(one, "two")
		if err := ioutil.Mkdir(two, 0755); err != nil {
			t.Fatal(err)
		}
		three := path.Join(two, "three")
		if err := ioutil.WriteFile(three, []byte(input), 0644); err != nil {
			t.Fatal(err)
		}
		syncFilename(t, three)
	}()

	// unmount to flush cache
	func() {
		mnt, _, cancelFn := makeFS(ctx, t, config)
		defer mnt.Close()
		defer cancelFn()

		p := path.Join(mnt.Dir, PrivateName, "jdoe", "one", "two", "three")
		buf, err := ioutil.ReadFile(p)
		if err != nil {
			t.Fatalf("read error: %v", err)
		}
		if g, e := string(buf), input; g != e {
			t.Errorf("bad file contents: %q != %q", g, e)
		}
	}()
}

func TestSymlink(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)

	func() {
		mnt, _, cancelFn := makeFS(ctx, t, config)
		defer mnt.Close()
		defer cancelFn()

		p := path.Join(mnt.Dir, PrivateName, "jdoe", "mylink")
		if err := os.Symlink("myfile", p); err != nil {
			t.Fatal(err)
		}
	}()

	// unmount to flush cache
	func() {
		mnt, _, cancelFn := makeFS(ctx, t, config)
		defer mnt.Close()
		defer cancelFn()

		p := path.Join(mnt.Dir, PrivateName, "jdoe", "mylink")
		target, err := os.Readlink(p)
		if err != nil {
			t.Fatal(err)
		}
		if g, e := target, "myfile"; g != e {
			t.Errorf("bad symlink target: %q != %q", g, e)
		}
	}()
}

func TestRename(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p1 := path.Join(mnt.Dir, PrivateName, "jdoe", "old")
	p2 := path.Join(mnt.Dir, PrivateName, "jdoe", "new")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p1, []byte(input), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p1)

	if err := ioutil.Rename(p1, p2); err != nil {
		t.Fatal(err)
	}

	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe"), map[string]fileInfoCheck{
		"new": func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input)))
		},
	})

	buf, err := ioutil.ReadFile(p2)
	if err != nil {
		t.Errorf("read error: %v", err)
	}
	if g, e := string(buf), input; g != e {
		t.Errorf("bad file contents: %q != %q", g, e)
	}

	if _, err := ioutil.ReadFile(p1); !ioutil.IsNotExist(err) {
		t.Errorf("old name still exists: %v", err)
	}
}

func TestRenameOverwrite(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p1 := path.Join(mnt.Dir, PrivateName, "jdoe", "old")
	p2 := path.Join(mnt.Dir, PrivateName, "jdoe", "new")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p1, []byte(input), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p1)
	if err := ioutil.WriteFile(p2, []byte("loser\n"), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p2)

	if err := ioutil.Rename(p1, p2); err != nil {
		t.Fatal(err)
	}

	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe"), map[string]fileInfoCheck{
		"new": nil,
	})

	buf, err := ioutil.ReadFile(p2)
	if err != nil {
		t.Errorf("read error: %v", err)
	}
	if g, e := string(buf), input; g != e {
		t.Errorf("bad file contents: %q != %q", g, e)
	}

	if _, err := ioutil.ReadFile(p1); !ioutil.IsNotExist(err) {
		t.Errorf("old name still exists: %v", err)
	}
}

func TestRenameCrossDir(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	if err := ioutil.Mkdir(path.Join(mnt.Dir, PrivateName, "jdoe", "one"), 0755); err != nil {
		t.Fatal(err)
	}
	if err := ioutil.Mkdir(path.Join(mnt.Dir, PrivateName, "jdoe", "two"), 0755); err != nil {
		t.Fatal(err)
	}
	p1 := path.Join(mnt.Dir, PrivateName, "jdoe", "one", "old")
	p2 := path.Join(mnt.Dir, PrivateName, "jdoe", "two", "new")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p1, []byte(input), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p1)

	if err := ioutil.Rename(p1, p2); err != nil {
		t.Fatal(err)
	}

	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe", "one"), map[string]fileInfoCheck{})
	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe", "two"), map[string]fileInfoCheck{
		"new": nil,
	})

	buf, err := ioutil.ReadFile(p2)
	if err != nil {
		t.Errorf("read error: %v", err)
	}
	if g, e := string(buf), input; g != e {
		t.Errorf("bad file contents: %q != %q", g, e)
	}

	if _, err := ioutil.ReadFile(p1); !ioutil.IsNotExist(err) {
		t.Errorf("old name still exists: %v", err)
	}
}

func TestRenameCrossFolder(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p1 := path.Join(mnt.Dir, PrivateName, "jdoe", "old")
	p2 := path.Join(mnt.Dir, PrivateName, "wsmith,jdoe", "new")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p1, []byte(input), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p1)

	err := ioutil.Rename(p1, p2)
	if err == nil {
		t.Fatalf("expected an error from rename: %v", err)
	}
	lerr, ok := errors.Cause(err).(*os.LinkError)
	if !ok {
		t.Fatalf("expected a LinkError from rename: %v", err)
	}
	if g, e := lerr.Op, "rename"; g != e {
		t.Errorf("wrong LinkError.Op: %q != %q", g, e)
	}
	if g, e := lerr.Old, p1; g != e {
		t.Errorf("wrong LinkError.Old: %q != %q", g, e)
	}
	if g, e := lerr.New, p2; g != e {
		t.Errorf("wrong LinkError.New: %q != %q", g, e)
	}
	if g, e := lerr.Err, syscall.EXDEV; g != e {
		t.Errorf("expected EXDEV: %T %v", lerr.Err, lerr.Err)
	}

	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe"), map[string]fileInfoCheck{
		"old": nil,
	})
	checkDir(t, path.Join(mnt.Dir, PrivateName, "wsmith,jdoe"), map[string]fileInfoCheck{})

	buf, err := ioutil.ReadFile(p1)
	if err != nil {
		t.Errorf("read error: %v", err)
	}
	if g, e := string(buf), input; g != e {
		t.Errorf("bad file contents: %q != %q", g, e)
	}

	if _, err := ioutil.ReadFile(p2); !ioutil.IsNotExist(err) {
		t.Errorf("new name exists even on error: %v", err)
	}
}

func TestWriteThenRename(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p1 := path.Join(mnt.Dir, PrivateName, "jdoe", "old")
	p2 := path.Join(mnt.Dir, PrivateName, "jdoe", "new")

	f, err := os.Create(p1)
	if err != nil {
		t.Fatalf("cannot create file: %v", err)
	}
	defer syncAndClose(t, f)

	// write to the file
	const input = "hello, world\n"
	if _, err := f.Write([]byte(input)); err != nil {
		t.Fatalf("cannot write: %v", err)
	}

	// now rename the file while it's still open
	if err := ioutil.Rename(p1, p2); err != nil {
		t.Fatal(err)
	}

	// check that the new path has the right length still
	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe"), map[string]fileInfoCheck{
		"new": func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input)))
		},
	})

	// write again to the same file
	const input2 = "goodbye, world\n"
	if _, err := f.Write([]byte(input2)); err != nil {
		t.Fatalf("cannot write after rename: %v", err)
	}

	buf, err := ioutil.ReadFile(p2)
	if err != nil {
		t.Errorf("read error: %v", err)
	}
	if g, e := string(buf), input+input2; g != e {
		t.Errorf("bad file contents: %q != %q", g, e)
	}

	if _, err := ioutil.ReadFile(p1); !ioutil.IsNotExist(err) {
		t.Errorf("old name still exists: %v", err)
	}
}

func TestWriteThenRenameCrossDir(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	if err := ioutil.Mkdir(path.Join(mnt.Dir, PrivateName, "jdoe", "one"), 0755); err != nil {
		t.Fatal(err)
	}
	if err := ioutil.Mkdir(path.Join(mnt.Dir, PrivateName, "jdoe", "two"), 0755); err != nil {
		t.Fatal(err)
	}
	p1 := path.Join(mnt.Dir, PrivateName, "jdoe", "one", "old")
	p2 := path.Join(mnt.Dir, PrivateName, "jdoe", "two", "new")

	f, err := os.Create(p1)
	if err != nil {
		t.Fatalf("cannot create file: %v", err)
	}
	defer syncAndClose(t, f)

	// write to the file
	const input = "hello, world\n"
	if _, err := f.Write([]byte(input)); err != nil {
		t.Fatalf("cannot write: %v", err)
	}

	// now rename the file while it's still open
	if err := ioutil.Rename(p1, p2); err != nil {
		t.Fatal(err)
	}

	// check that the new path has the right length still
	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe", "two"), map[string]fileInfoCheck{
		"new": func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input)))
		},
	})

	// write again to the same file
	const input2 = "goodbye, world\n"
	if _, err := f.Write([]byte(input2)); err != nil {
		t.Fatalf("cannot write after rename: %v", err)
	}

	buf, err := ioutil.ReadFile(p2)
	if err != nil {
		t.Errorf("read error: %v", err)
	}
	if g, e := string(buf), input+input2; g != e {
		t.Errorf("bad file contents: %q != %q", g, e)
	}

	if _, err := ioutil.ReadFile(p1); !ioutil.IsNotExist(err) {
		t.Errorf("old name still exists: %v", err)
	}
}

func TestRemoveFile(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p, []byte(input), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	if err := ioutil.Remove(p); err != nil {
		t.Fatal(err)
	}

	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe"), map[string]fileInfoCheck{})

	if _, err := ioutil.ReadFile(p); !ioutil.IsNotExist(err) {
		t.Errorf("file still exists: %v", err)
	}
}

func TestRemoveTLF(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "pikachu")
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)

	p := path.Join(mnt.Dir, PrivateName, "jdoe,pikachu")
	f1, err := os.Create(path.Join(p, "f"))
	if err != nil {
		t.Fatal(err)
	}
	syncAndClose(t, f1)

	privatePath := path.Join(mnt.Dir, PrivateName)
	checks := map[string]fileInfoCheck{
		"jdoe": nil,
	}

	var lastErr error
	for i := 0; i < 10; i++ {
		if err := syscall.Rmdir(p); err != nil {
			t.Fatal(err)
		}

		if runtime.GOOS != "darwin" {
			checkDir(t, privatePath, checks)
			return
		}

		// On OSX, the OS might decide to look up "f" at exactly the wrong
		// time, and reinstate the "jdoe,pikachu".  Unfortunately there's
		// no good way to prevent this, so for now we just allow it to
		// happen and retry until we get what we want.  See KBFS-1370.
		lastErr = checkDirNoTestError(t, privatePath, checks)
		if lastErr == nil {
			return
		}

		// Make sure the test should still be running.
		select {
		case <-ctx.Done():
			t.Fatal(ctx.Err())
		default:
			t.Logf("Retrying TLF removal after error %+v", lastErr)
		}
	}
	if lastErr != nil {
		t.Error(lastErr)
	}
}

func TestRemoveDir(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "mydir")
	if err := ioutil.Mkdir(p, 0755); err != nil {
		t.Fatal(err)
	}

	if err := syscall.Rmdir(p); err != nil {
		t.Fatal(err)
	}

	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe"), map[string]fileInfoCheck{})

	if _, err := ioutil.Stat(p); !ioutil.IsNotExist(err) {
		t.Errorf("file still exists: %v", err)
	}
}

func TestRemoveDirNotEmpty(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "mydir")
	if err := ioutil.Mkdir(p, 0755); err != nil {
		t.Fatal(err)
	}
	pFile := path.Join(p, "myfile")
	if err := ioutil.WriteFile(pFile, []byte("i'm important"), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, pFile)

	err := syscall.Rmdir(p)
	if g, e := err, syscall.ENOTEMPTY; g != e {
		t.Fatalf("wrong error from rmdir: %v (%T) != %v (%T)", g, g, e, e)
	}

	if _, err := ioutil.ReadFile(pFile); err != nil {
		t.Errorf("file was lost: %v", err)
	}
}

func TestRemoveFileWhileOpenSetEx(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	f, err := os.Create(p)
	if err != nil {
		t.Fatalf("cannot create file: %v", err)
	}
	// Call in a closure since `f` is overridden below.
	defer func() { syncAndClose(t, f) }()

	if err := ioutil.Remove(p); err != nil {
		t.Fatalf("cannot delete file: %v", err)
	}

	// this must not resurrect a deleted file
	if err := f.Chmod(0755); err != nil {
		t.Fatalf("cannot setex: %v", err)
	}

	// Make sure the mode sticks around even though the file was unlinked.
	fi, err := f.Stat()
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.Mode().String(), `-rwx------`; g != e {
		t.Errorf("wrong mode: %q != %q", g, e)
	}
	syncAndClose(t, f)
	f = nil

	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe"),
		map[string]fileInfoCheck{})

	if _, err := ioutil.ReadFile(p); !ioutil.IsNotExist(err) {
		t.Errorf("file still exists: %v", err)
	}
}

func TestRemoveFileWhileOpenWritingInTLFRoot(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	f, err := os.Create(p)
	if err != nil {
		t.Fatalf("cannot create file: %v", err)
	}
	// Call in a closure since `f` is overridden below.
	defer func() { syncAndClose(t, f) }()

	if err := ioutil.Remove(p); err != nil {
		t.Fatalf("cannot delete file: %v", err)
	}

	// this must not resurrect a deleted file
	const input = "hello, world\n"
	if _, err := f.Write([]byte(input)); err != nil {
		t.Fatalf("cannot write: %v", err)
	}
	syncAndClose(t, f)
	f = nil

	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe"), map[string]fileInfoCheck{})

	if _, err := ioutil.ReadFile(p); !ioutil.IsNotExist(err) {
		t.Errorf("file still exists: %v", err)
	}
}

func TestRemoveFileWhileOpenWritingInSubDir(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	dirPath := path.Join(mnt.Dir, PrivateName, "jdoe", "dir")
	if err := os.Mkdir(dirPath, 0700); err != nil {
		t.Fatal(err)
	}

	p := path.Join(dirPath, "myfile")
	f, err := os.Create(p)
	if err != nil {
		t.Fatalf("cannot create file: %v", err)
	}
	// Call in a closure since `f` is overridden below.
	defer func() { syncAndClose(t, f) }()

	if err := ioutil.Remove(p); err != nil {
		t.Fatalf("cannot delete file: %v", err)
	}

	// this must not resurrect a deleted file
	const input = "hello, world\n"
	if _, err := f.Write([]byte(input)); err != nil {
		t.Fatalf("cannot write: %v", err)
	}
	syncAndClose(t, f)
	f = nil

	checkDir(t, dirPath, map[string]fileInfoCheck{})

	if _, err := ioutil.ReadFile(p); !ioutil.IsNotExist(err) {
		t.Errorf("file still exists: %v", err)
	}
}

func TestRenameOverFileWhileOpenWritingInDifferentDir(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	dirPath := path.Join(mnt.Dir, PrivateName, "jdoe", "dir")
	if err := os.Mkdir(dirPath, 0700); err != nil {
		t.Fatal(err)
	}

	p1 := path.Join(dirPath, "myfile")
	f1, err := os.Create(p1)
	if err != nil {
		t.Fatalf("cannot create file: %v", err)
	}
	// Call in a closure since `f1` is overridden below.
	defer func() { syncAndClose(t, f1) }()

	p2 := path.Join(mnt.Dir, PrivateName, "jdoe", "mynewfile")
	f2, err := os.Create(p2)
	if err != nil {
		t.Fatalf("cannot create file: %v", err)
	}
	syncAndClose(t, f2)

	if err := os.Rename(p2, p1); err != nil {
		t.Fatalf("cannot move file: %v", err)
	}

	// this must not resurrect content in f2
	const input = "hello, world\n"
	if _, err := f1.Write([]byte(input)); err != nil {
		t.Fatalf("cannot write: %v", err)
	}
	syncAndClose(t, f1)
	f1 = nil

	checkDir(t, dirPath, map[string]fileInfoCheck{"myfile": nil})

	content, err := ioutil.ReadFile(p1)
	if err != nil {
		t.Fatal(err)
	}
	if len(content) > 0 {
		t.Errorf("write to overwritee resulted in content in overwriter")
	}
}

func TestRenameOverFileWhileOpenWritingInSameSubDir(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	dirPath := path.Join(mnt.Dir, PrivateName, "jdoe", "dir")
	if err := os.Mkdir(dirPath, 0700); err != nil {
		t.Fatal(err)
	}

	p1 := path.Join(dirPath, "myfile")
	f1, err := os.Create(p1)
	if err != nil {
		t.Fatalf("cannot create file: %v", err)
	}
	// Call in a closure since `f1` is overridden below.
	defer func() { syncAndClose(t, f1) }()

	p2 := path.Join(dirPath, "mynewfile")
	f2, err := os.Create(p2)
	if err != nil {
		t.Fatalf("cannot create file: %v", err)
	}
	syncAndClose(t, f2)

	if err := os.Rename(p2, p1); err != nil {
		t.Fatalf("cannot move file: %v", err)
	}

	// this must not resurrect content in f2
	const input = "hello, world\n"
	if _, err := f1.Write([]byte(input)); err != nil {
		t.Fatalf("cannot write: %v", err)
	}
	syncAndClose(t, f1)
	f1 = nil

	checkDir(t, dirPath, map[string]fileInfoCheck{"myfile": nil})

	content, err := ioutil.ReadFile(p1)
	if err != nil {
		t.Fatal(err)
	}
	if len(content) > 0 {
		t.Errorf("write to overwritee resulted in content in overwriter")
	}
}

func TestRemoveFileWhileOpenReading(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p, []byte(input), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	f, err := os.Open(p)
	if err != nil {
		t.Fatalf("cannot open file: %v", err)
	}
	// Call in a closure since `f` is overridden below.
	defer func() { syncAndClose(t, f) }()

	if err := ioutil.Remove(p); err != nil {
		t.Fatalf("cannot delete file: %v", err)
	}

	buf, err := ioutil.ReadAll(f)
	if err != nil {
		t.Fatalf("cannot read unlinked file: %v", err)
	}
	if g, e := string(buf), input; g != e {
		t.Errorf("read wrong content: %q != %q", g, e)
	}

	syncAndClose(t, f)
	f = nil

	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe"), map[string]fileInfoCheck{})

	if _, err := ioutil.ReadFile(p); !ioutil.IsNotExist(err) {
		t.Errorf("file still exists: %v", err)
	}
}

func TestRemoveFileWhileOpenReadingAcrossMounts(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config1 := libkbfs.MakeTestConfigOrBust(t, "user1",
		"user2")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config1)
	mnt1, fs1, cancelFn1 := makeFS(ctx, t, config1)
	defer mnt1.Close()
	defer cancelFn1()

	config2 := libkbfs.ConfigAsUser(config1, "user2")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config2)
	mnt2, fs2, cancelFn2 := makeFS(ctx, t, config2)
	defer mnt2.Close()
	defer cancelFn2()

	if !mnt2.Conn.Protocol().HasInvalidate() {
		t.Skip("Old FUSE protocol")
	}

	p1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "myfile")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p1, []byte(input), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p1)

	f, err := os.Open(p1)
	if err != nil {
		t.Fatalf("cannot open file: %v", err)
	}
	// Call in a closure since `f` is overridden below.
	defer func() { syncAndClose(t, f) }()

	syncFolderToServer(t, "user1,user2", fs2)

	p2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "myfile")
	if err := ioutil.Remove(p2); err != nil {
		t.Fatalf("cannot delete file: %v", err)
	}
	syncAll(t, "user1,user2", tlf.Private, fs2)

	syncFolderToServer(t, "user1,user2", fs1)

	buf, err := ioutil.ReadAll(f)
	if err != nil {
		t.Fatalf("cannot read unlinked file: %v", err)
	}
	if g, e := string(buf), input; g != e {
		t.Errorf("read wrong content: %q != %q", g, e)
	}

	syncAndClose(t, f)
	f = nil

	checkDir(t, path.Join(mnt1.Dir, PrivateName, "user1,user2"),
		map[string]fileInfoCheck{})

	if _, err := ioutil.ReadFile(p1); !ioutil.IsNotExist(err) {
		t.Errorf("file still exists: %v", err)
	}
}

func TestRenameOverFileWhileOpenReadingAcrossMounts(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config1 := libkbfs.MakeTestConfigOrBust(t, "user1",
		"user2")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config1)
	mnt1, fs1, cancelFn1 := makeFS(ctx, t, config1)
	defer mnt1.Close()
	defer cancelFn1()

	config2 := libkbfs.ConfigAsUser(config1, "user2")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config2)
	mnt2, fs2, cancelFn2 := makeFS(ctx, t, config2)
	defer mnt2.Close()
	defer cancelFn2()

	if !mnt2.Conn.Protocol().HasInvalidate() {
		t.Skip("Old FUSE protocol")
	}

	p1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "myfile")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p1, []byte(input), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p1)

	p1Other := path.Join(mnt1.Dir, PrivateName, "user1,user2", "other")
	const inputOther = "hello, other\n"
	if err := ioutil.WriteFile(p1Other, []byte(inputOther), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p1Other)

	f, err := os.Open(p1)
	if err != nil {
		t.Fatalf("cannot open file: %v", err)
	}
	// Call in a closure since `f` is overridden below.
	defer func() { syncAndClose(t, f) }()

	syncFolderToServer(t, "user1,user2", fs2)

	p2Other := path.Join(mnt2.Dir, PrivateName, "user1,user2", "other")
	p2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "myfile")
	if err := ioutil.Rename(p2Other, p2); err != nil {
		t.Fatalf("cannot rename file: %v", err)
	}
	syncAll(t, "user1,user2", tlf.Private, fs2)

	syncFolderToServer(t, "user1,user2", fs1)

	buf, err := ioutil.ReadAll(f)
	if err != nil {
		t.Fatalf("cannot read unlinked file: %v", err)
	}
	if g, e := string(buf), input; g != e {
		t.Errorf("read wrong content: %q != %q", g, e)
	}

	syncAndClose(t, f)
	f = nil

	checkDir(t, path.Join(mnt1.Dir, PrivateName, "user1,user2"),
		map[string]fileInfoCheck{
			"myfile": nil,
		})

	if _, err := ioutil.ReadFile(p1Other); !ioutil.IsNotExist(err) {
		t.Errorf("other file still exists: %v", err)
	}

	buf, err = ioutil.ReadFile(p1)
	if err != nil {
		t.Errorf("read error: %v", err)
	}
	if g, e := string(buf), inputOther; g != e {
		t.Errorf("bad file contents: %q != %q", g, e)
	}
}

func TestTruncateGrow(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p, []byte(input), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	const newSize = 100
	if err := os.Truncate(p, newSize); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	fi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.Size(), int64(newSize); g != e {
		t.Errorf("wrong size: %v != %v", g, e)
	}

	buf, err := ioutil.ReadFile(p)
	if err != nil {
		t.Fatalf("cannot read unlinked file: %v", err)
	}
	if g, e := string(buf), input+strings.Repeat("\x00", newSize-len(input)); g != e {
		t.Errorf("read wrong content: %q != %q", g, e)
	}
}

func TestTruncateShrink(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p, []byte(input), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	const newSize = 4
	if err := os.Truncate(p, newSize); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	fi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.Size(), int64(newSize); g != e {
		t.Errorf("wrong size: %v != %v", g, e)
	}

	buf, err := ioutil.ReadFile(p)
	if err != nil {
		t.Fatalf("cannot read unlinked file: %v", err)
	}
	if g, e := string(buf), input[:newSize]; g != e {
		t.Errorf("read wrong content: %q != %q", g, e)
	}
}

func TestChmodExec(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p, []byte(input), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	if err := os.Chmod(p, 0744); err != nil {
		t.Fatal(err)
	}

	fi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.Mode().String(), `-rwx------`; g != e {
		t.Errorf("wrong mode: %q != %q", g, e)
	}
}

func TestChmodNonExec(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p, []byte(input), 0755); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	if err := os.Chmod(p, 0655); err != nil {
		t.Fatal(err)
	}

	fi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.Mode().String(), `-rw-------`; g != e {
		t.Errorf("wrong mode: %q != %q", g, e)
	}
}

func TestChownFileIgnored(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p, []byte(input), 0755); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	fi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	oldOwner := int(fi.Sys().(*syscall.Stat_t).Uid)

	if err := os.Chown(p, oldOwner+1, oldOwner+1); err != nil {
		t.Fatalf("Expecting the file chown to get swallowed silently, "+
			"but got: %v", err)
	}

	newFi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	newOwner := int(newFi.Sys().(*syscall.Stat_t).Uid)
	if oldOwner != newOwner {
		t.Fatalf("Owner changed unexpectedly to %d after a chown", newOwner)
	}
}

func TestChmodDirIgnored(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "mydir")
	if err := ioutil.Mkdir(p, 0755); err != nil {
		t.Fatal(err)
	}

	if err := os.Chmod(p, 0655); err != nil {
		t.Fatalf("Expecting the dir chmod to get swallowed silently, "+
			"but got: %v", err)
	}
}

func TestChownDirIgnored(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "mydir")
	if err := ioutil.Mkdir(p, 0755); err != nil {
		t.Fatal(err)
	}

	fi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	oldOwner := int(fi.Sys().(*syscall.Stat_t).Uid)

	if err := os.Chown(p, 1, 1); err != nil {
		t.Fatalf("Expecting the dir chown to get swallowed silently, "+
			"but got: %v", err)
	}

	newFi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	newOwner := int(newFi.Sys().(*syscall.Stat_t).Uid)
	if oldOwner != newOwner {
		t.Fatalf("Owner changed unexpectedly to %d after a chown", newOwner)
	}
}

func TestSetattrFileMtime(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p, []byte(input), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	mtime := time.Date(2015, 1, 2, 3, 4, 5, 6, time.Local)
	// KBFS does not respect atime (which is ok), but we need to give
	// something to the syscall.
	atime := time.Date(2015, 7, 8, 9, 10, 11, 12, time.Local)
	if err := os.Chtimes(p, atime, mtime); err != nil {
		t.Fatal(err)
	}

	fi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.ModTime(), mtime; !libfs.TimeEqual(g, e) {
		t.Errorf("wrong mtime: %v !~= %v", g, e)
	}
}

func TestSetattrFileMtimeAfterWrite(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p, []byte(input), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	const input2 = "second round of content"
	{
		ctx := libcontext.BackgroundContextWithCancellationDelayer()
		defer testCleanupDelayer(ctx, t)

		jdoe := libkbfs.GetRootNodeOrBust(ctx, t, config, "jdoe", tlf.Private)

		ops := config.KBFSOps()
		myfile, _, err := ops.Lookup(ctx, jdoe, jdoe.ChildName("myfile"))
		if err != nil {
			t.Fatal(err)
		}
		if err := ops.Write(ctx, myfile, []byte(input2), 0); err != nil {
			t.Fatal(err)
		}
		// Don't sync
	}

	mtime := time.Date(2015, 1, 2, 3, 4, 5, 6, time.Local)
	// KBFS does not respect atime (which is ok), but we need to give
	// something to the syscall.
	atime := time.Date(2015, 7, 8, 9, 10, 11, 12, time.Local)
	if err := os.Chtimes(p, atime, mtime); err != nil {
		t.Fatal(err)
	}

	fi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.ModTime(), mtime; !libfs.TimeEqual(g, e) {
		t.Errorf("wrong mtime: %v !~= %v", g, e)
	}
	syncFilename(t, p)
}

func TestSetattrFileMtimeNow(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	const input = "hello, world\n"
	if err := ioutil.WriteFile(p, []byte(input), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	mtime := time.Date(2015, 1, 2, 3, 4, 5, 6, time.Local)
	// KBFS does not respect atime (which is ok), but we need to give
	// something to the syscall.
	atime := time.Date(2015, 7, 8, 9, 10, 11, 12, time.Local)
	if err := os.Chtimes(p, atime, mtime); err != nil {
		t.Fatal(err)
	}

	// cause mtime to be set to now
	if err := unix.Utimes(p, nil); err != nil {
		t.Fatalf("touch failed: %v", err)
	}
	now := time.Now()

	fi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	if g, o := fi.ModTime(), mtime; !g.After(o) {
		t.Errorf("mtime did not progress: %v <= %v", g, o)
	}
	if g, e := fi.ModTime(), now; !timeEqualFuzzy(g, e, 1*time.Second) {
		t.Errorf("mtime is wrong: %v !~= %v", g, e)
	}
}

func TestSetattrDirMtime(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "mydir")
	if err := ioutil.Mkdir(p, 0755); err != nil {
		t.Fatal(err)
	}

	mtime := time.Date(2015, 1, 2, 3, 4, 5, 6, time.Local)
	// KBFS does not respect atime (which is ok), but we need to give
	// something to the syscall.
	atime := time.Date(2015, 7, 8, 9, 10, 11, 12, time.Local)
	if err := os.Chtimes(p, atime, mtime); err != nil {
		t.Fatal(err)
	}

	fi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := fi.ModTime(), mtime; !libfs.TimeEqual(g, e) {
		t.Errorf("wrong mtime: %v !~= %v", g, e)
	}
}

func TestSetattrDirMtimeNow(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "mydir")
	if err := ioutil.Mkdir(p, 0755); err != nil {
		t.Fatal(err)
	}

	mtime := time.Date(2015, 1, 2, 3, 4, 5, 6, time.Local)
	// KBFS does not respect atime (which is ok), but we need to give
	// something to the syscall.
	atime := time.Date(2015, 7, 8, 9, 10, 11, 12, time.Local)
	if err := os.Chtimes(p, atime, mtime); err != nil {
		t.Fatal(err)
	}

	// cause mtime to be set to now
	if err := unix.Utimes(p, nil); err != nil {
		t.Fatalf("touch failed: %v", err)
	}
	now := time.Now()

	fi, err := ioutil.Lstat(p)
	if err != nil {
		t.Fatal(err)
	}
	if g, o := fi.ModTime(), mtime; !g.After(o) {
		t.Errorf("mtime did not progress: %v <= %v", g, o)
	}
	if g, e := fi.ModTime(), now; !timeEqualFuzzy(g, e, 1*time.Second) {
		t.Errorf("mtime is wrong: %v !~= %v", g, e)
	}
}

func TestFsync(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	f, err := os.Create(p)
	if err != nil {
		t.Fatal(err)
	}
	// Call in a closure since `f` is overridden below.
	defer func() { syncAndClose(t, f) }()
	const input = "hello, world\n"
	if _, err := io.WriteString(f, input); err != nil {
		t.Fatalf("write error: %v", err)
	}
	if err := f.Sync(); err != nil {
		t.Fatalf("fsync error: %v", err)
	}
	if err := f.Close(); err != nil {
		t.Fatalf("close error: %v", err)
	}
	f = nil
}

func TestReaddirMyPublic(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	files := map[string]fileInfoCheck{
		"one": nil,
		"two": nil,
	}
	for filename := range files {
		p := path.Join(mnt.Dir, PublicName, "jdoe", filename)
		if err := ioutil.WriteFile(
			p, []byte("data for "+filename), 0644); err != nil {
			t.Fatal(err)
		}
		syncFilename(t, p)
	}

	checkDir(t, path.Join(mnt.Dir, PublicName, "jdoe"), files)
}

func TestReaddirOtherFolderAsReader(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	func() {
		mnt, _, cancelFn := makeFS(ctx, t, config)
		defer mnt.Close()
		defer cancelFn()

		// cause the folder to exist
		p := path.Join(mnt.Dir, PrivateName, "jdoe#wsmith", "myfile")
		if err := ioutil.WriteFile(
			p, []byte("data for myfile"), 0644); err != nil {
			t.Fatal(err)
		}
		syncFilename(t, p)
	}()

	c2 := libkbfs.ConfigAsUser(config, "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, c2)
	mnt, _, cancelFn := makeFS(ctx, t, c2)
	defer mnt.Close()
	defer cancelFn()

	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe#wsmith"), map[string]fileInfoCheck{
		"myfile": nil,
	})
}

func TestReaddirMissingOtherFolderAsReader(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	c2 := libkbfs.ConfigAsUser(config, "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, c2)
	mnt, _, cancelFn := makeFS(ctx, t, c2)
	defer mnt.Close()
	defer cancelFn()

	// Check that folder that doesn't exist yet looks empty
	checkDir(t, path.Join(mnt.Dir, PrivateName, "jdoe#wsmith"),
		map[string]fileInfoCheck{})
}

func TestLookupMissingOtherFolderAsReader(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	c2 := libkbfs.ConfigAsUser(config, "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, c2)
	mnt, _, cancelFn := makeFS(ctx, t, c2)
	defer mnt.Close()
	defer cancelFn()

	p := path.Join(mnt.Dir, PrivateName, "jdoe#wsmith", "foo")
	if _, err := ioutil.Stat(p); !ioutil.IsNotExist(err) {
		t.Errorf("Expected ENOENT, but got: %v", err)
	}
}

func TestStatOtherFolder(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	func() {
		mnt, _, cancelFn := makeFS(ctx, t, config)
		defer mnt.Close()
		defer cancelFn()

		// cause the folder to exist
		p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
		if err := ioutil.WriteFile(
			p, []byte("data for myfile"), 0644); err != nil {
			t.Fatal(err)
		}
		syncFilename(t, p)
	}()

	c2 := libkbfs.ConfigAsUser(config, "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, c2)
	mnt, _, cancelFn := makeFS(ctx, t, c2)
	defer mnt.Close()
	defer cancelFn()

	switch _, err := ioutil.Lstat(path.Join(mnt.Dir, PrivateName, "jdoe")); err := errors.Cause(err).(type) {
	case *os.PathError:
		if g, e := err.Err, syscall.EACCES; g != e {
			t.Fatalf("wrong error: %v != %v", g, e)
		}
	default:
		t.Fatalf("expected a PathError, got %T: %v", err, err)
	}
}

func TestStatOtherFolderFirstUse(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	// This triggers a different error than with the warmup.
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)

	c2 := libkbfs.ConfigAsUser(config, "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, c2)
	mnt, _, cancelFn := makeFS(ctx, t, c2)
	defer mnt.Close()
	defer cancelFn()

	switch _, err := ioutil.Lstat(path.Join(mnt.Dir, PrivateName, "jdoe")); err := errors.Cause(err).(type) {
	case *os.PathError:
		if g, e := err.Err, syscall.EACCES; g != e {
			t.Fatalf("wrong error: %v != %v", g, e)
		}
	default:
		t.Fatalf("expected a PathError, got %T: %v", err, err)
	}
}

func TestStatOtherFolderPublic(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	func() {
		mnt, _, cancelFn := makeFS(ctx, t, config)
		defer mnt.Close()
		defer cancelFn()

		// cause the folder to exist
		p := path.Join(mnt.Dir, PublicName, "jdoe", "myfile")
		if err := ioutil.WriteFile(
			p, []byte("data for myfile"), 0644); err != nil {
			t.Fatal(err)
		}
		syncFilename(t, p)
	}()

	c2 := libkbfs.ConfigAsUser(config, "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, c2)
	mnt, _, cancelFn := makeFS(ctx, t, c2)
	defer mnt.Close()
	defer cancelFn()

	fi, err := ioutil.Lstat(path.Join(mnt.Dir, PublicName, "jdoe"))
	if err != nil {
		t.Fatal(err)
	}
	// TODO figure out right modes, note owner is the person running
	// fuse, not the person owning the folder
	if g, e := fi.Mode().String(), `dr-x------`; g != e {
		t.Errorf("wrong mode for folder: %q != %q", g, e)
	}
}

func TestReadPublicFile(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	const input = "hello, world\n"
	func() {
		mnt, _, cancelFn := makeFS(ctx, t, config)
		defer mnt.Close()
		defer cancelFn()

		// cause the folder to exist
		p := path.Join(mnt.Dir, PublicName, "jdoe", "myfile")
		if err := ioutil.WriteFile(p, []byte(input), 0644); err != nil {
			t.Fatal(err)
		}
		syncFilename(t, p)
	}()

	c2 := libkbfs.ConfigAsUser(config, "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, c2)
	mnt, _, cancelFn := makeFS(ctx, t, c2)
	defer mnt.Close()
	defer cancelFn()

	buf, err := ioutil.ReadFile(path.Join(mnt.Dir, PublicName, "jdoe", "myfile"))
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input; g != e {
		t.Errorf("bad file contents: %q != %q", g, e)
	}
}

func TestReaddirOtherFolderPublicAsAnyone(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	func() {
		mnt, _, cancelFn := makeFS(ctx, t, config)
		defer mnt.Close()
		defer cancelFn()

		// cause the folder to exist
		p := path.Join(mnt.Dir, PublicName, "jdoe", "myfile")
		if err := ioutil.WriteFile(
			p, []byte("data for myfile"), 0644); err != nil {
			t.Fatal(err)
		}
		syncFilename(t, p)
	}()

	c2 := libkbfs.ConfigAsUser(config, "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, c2)
	mnt, _, cancelFn := makeFS(ctx, t, c2)
	defer mnt.Close()
	defer cancelFn()

	checkDir(t, path.Join(mnt.Dir, PublicName, "jdoe"), map[string]fileInfoCheck{
		"myfile": nil,
	})
}

func TestReaddirMissingFolderPublicAsAnyone(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	c2 := libkbfs.ConfigAsUser(config, "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, c2)
	mnt, _, cancelFn := makeFS(ctx, t, c2)
	defer mnt.Close()
	defer cancelFn()

	// Make sure a public folder, not yet created by its writer, looks empty.
	checkDir(t, path.Join(mnt.Dir, PublicName, "jdoe"),
		map[string]fileInfoCheck{})
}

func TestReaddirOtherFolderAsAnyone(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	func() {
		mnt, _, cancelFn := makeFS(ctx, t, config)
		defer mnt.Close()
		defer cancelFn()

		// cause the folder to exist
		p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
		if err := ioutil.WriteFile(
			p, []byte("data for myfile"), 0644); err != nil {
			t.Fatal(err)
		}
		syncFilename(t, p)
	}()

	c2 := libkbfs.ConfigAsUser(config, "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, c2)
	mnt, _, cancelFn := makeFS(ctx, t, c2)
	defer mnt.Close()
	defer cancelFn()

	switch _, err := ioutil.ReadDir(path.Join(mnt.Dir, PrivateName, "jdoe")); err := errors.Cause(err).(type) {
	case *os.PathError:
		if g, e := err.Err, syscall.EACCES; g != e {
			t.Fatalf("wrong error: %v != %v", g, e)
		}
	default:
		t.Fatalf("expected a PathError, got %T: %v", err, err)
	}
}

func syncFolderToServerHelper(t *testing.T, tlf string, ty tlf.Type, fs *FS) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	root := libkbfs.GetRootNodeOrBust(ctx, t, fs.config, tlf, ty)
	err := fs.config.KBFSOps().SyncFromServer(ctx,
		root.GetFolderBranch(), nil)
	if err != nil {
		t.Fatalf("Couldn't sync from server: %v", err)
	}
	fs.NotificationGroupWait()
}

func syncFolderToServer(t *testing.T, name string, fs *FS) {
	syncFolderToServerHelper(t, name, tlf.Private, fs)
}

func syncPublicFolderToServer(t *testing.T, name string, fs *FS) {
	syncFolderToServerHelper(t, name, tlf.Public, fs)
}

func TestInvalidateDataOnWrite(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt1, _, cancelFn1 := makeFS(ctx, t, config)
	defer mnt1.Close()
	defer cancelFn1()
	config2 := libkbfs.ConfigAsUser(config, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config2)
	mnt2, fs2, cancelFn2 := makeFS(ctx, t, config2)
	defer mnt2.Close()
	defer cancelFn2()

	if !mnt2.Conn.Protocol().HasInvalidate() {
		t.Skip("Old FUSE protocol")
	}

	const input1 = "input round one"
	p := path.Join(mnt1.Dir, PrivateName, "jdoe", "myfile")
	if err := ioutil.WriteFile(p, []byte(input1), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	syncFolderToServer(t, "jdoe", fs2)

	f, err := os.Open(path.Join(mnt2.Dir, PrivateName, "jdoe", "myfile"))
	if err != nil {
		t.Fatal(err)
	}
	defer syncAndClose(t, f)

	{
		buf := make([]byte, 4096)
		n, err := f.ReadAt(buf, 0)
		if err != nil && err != io.EOF {
			t.Fatal(err)
		}
		if g, e := string(buf[:n]), input1; g != e {
			t.Errorf("wrong content: %q != %q", g, e)
		}
	}

	const input2 = "second round of content"
	if err := ioutil.WriteFile(p, []byte(input2), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	syncFolderToServer(t, "jdoe", fs2)

	{
		buf := make([]byte, 4096)
		n, err := f.ReadAt(buf, 0)
		if err != nil && err != io.EOF {
			t.Fatal(err)
		}
		if g, e := string(buf[:n]), input2; g != e {
			t.Errorf("wrong content: %q != %q", g, e)
		}
	}
}

func TestInvalidatePublicDataOnWrite(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt1, _, cancelFn1 := makeFS(ctx, t, config)
	defer mnt1.Close()
	defer cancelFn1()
	config2 := libkbfs.ConfigAsUser(config, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config2)
	mnt2, fs2, cancelFn2 := makeFS(ctx, t, config2)
	defer mnt2.Close()
	defer cancelFn2()

	if !mnt2.Conn.Protocol().HasInvalidate() {
		t.Skip("Old FUSE protocol")
	}

	const input1 = "input round one"
	p := path.Join(mnt1.Dir, PublicName, "jdoe", "myfile")
	if err := ioutil.WriteFile(p, []byte(input1), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	syncPublicFolderToServer(t, "jdoe", fs2)

	f, err := os.Open(path.Join(mnt2.Dir, PublicName, "jdoe", "myfile"))
	if err != nil {
		t.Fatal(err)
	}
	defer syncAndClose(t, f)

	{
		buf := make([]byte, 4096)
		n, err := f.ReadAt(buf, 0)
		if err != nil && err != io.EOF {
			t.Fatal(err)
		}
		if g, e := string(buf[:n]), input1; g != e {
			t.Errorf("wrong content: %q != %q", g, e)
		}
	}

	const input2 = "second round of content"
	if err := ioutil.WriteFile(p, []byte(input2), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	syncPublicFolderToServer(t, "jdoe", fs2)

	{
		buf := make([]byte, 4096)
		n, err := f.ReadAt(buf, 0)
		if err != nil && err != io.EOF {
			t.Fatal(err)
		}
		if g, e := string(buf[:n]), input2; g != e {
			t.Errorf("wrong content: %q != %q", g, e)
		}
	}
}

func TestInvalidateDataOnTruncate(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt1, _, cancelFn1 := makeFS(ctx, t, config)
	defer mnt1.Close()
	defer cancelFn1()
	config2 := libkbfs.ConfigAsUser(config, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config2)
	mnt2, fs2, cancelFn2 := makeFS(ctx, t, config2)
	defer mnt2.Close()
	defer cancelFn2()

	if !mnt2.Conn.Protocol().HasInvalidate() {
		t.Skip("Old FUSE protocol")
	}

	const input1 = "input round one"
	p := path.Join(mnt1.Dir, PrivateName, "jdoe", "myfile")
	if err := ioutil.WriteFile(p, []byte(input1), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	syncFolderToServer(t, "jdoe", fs2)

	f, err := os.Open(path.Join(mnt2.Dir, PrivateName, "jdoe", "myfile"))
	if err != nil {
		t.Fatal(err)
	}
	defer syncAndClose(t, f)

	{
		buf := make([]byte, 4096)
		n, err := f.ReadAt(buf, 0)
		if err != nil && err != io.EOF {
			t.Fatal(err)
		}
		if g, e := string(buf[:n]), input1; g != e {
			t.Errorf("wrong content: %q != %q", g, e)
		}
	}

	const newSize = 3
	if err := os.Truncate(p, newSize); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	syncFolderToServer(t, "jdoe", fs2)

	{
		buf := make([]byte, 4096)
		n, err := f.ReadAt(buf, 0)
		if err != nil && err != io.EOF {
			t.Fatal(err)
		}
		if g, e := string(buf[:n]), input1[:newSize]; g != e {
			t.Errorf("wrong content: %q != %q", g, e)
		}
	}
}

func TestInvalidateDataOnLocalWrite(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, fs, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	if !mnt.Conn.Protocol().HasInvalidate() {
		t.Skip("Old FUSE protocol")
	}

	const input1 = "input round one"
	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	if err := ioutil.WriteFile(p, []byte(input1), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	f, err := os.Open(path.Join(mnt.Dir, PrivateName, "jdoe", "myfile"))
	if err != nil {
		t.Fatal(err)
	}
	defer syncAndClose(t, f)

	{
		buf := make([]byte, 4096)
		n, err := f.ReadAt(buf, 0)
		if err != nil && err != io.EOF {
			t.Fatal(err)
		}
		if g, e := string(buf[:n]), input1; g != e {
			t.Errorf("wrong content: %q != %q", g, e)
		}
	}

	const input2 = "second round of content"
	{
		ctx := libcontext.BackgroundContextWithCancellationDelayer()
		defer testCleanupDelayer(ctx, t)

		jdoe := libkbfs.GetRootNodeOrBust(ctx, t, config, "jdoe", tlf.Private)
		ops := config.KBFSOps()
		myfile, _, err := ops.Lookup(ctx, jdoe, jdoe.ChildName("myfile"))
		if err != nil {
			t.Fatal(err)
		}
		if err := ops.Write(ctx, myfile, []byte(input2), 0); err != nil {
			t.Fatal(err)
		}
	}

	// The Write above is a local change, and thus we can just do a
	// local wait without syncing to the server.
	fs.NotificationGroupWait()

	{
		buf := make([]byte, 4096)
		n, err := f.ReadAt(buf, 0)
		if err != nil && err != io.EOF {
			t.Fatal(err)
		}
		if g, e := string(buf[:n]), input2; g != e {
			t.Errorf("wrong content: %q != %q", g, e)
		}
	}
}

func TestInvalidateEntryOnDelete(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe", "wsmith")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt1, _, cancelFn1 := makeFS(ctx, t, config)
	defer mnt1.Close()
	defer cancelFn1()
	mnt2, fs2, cancelFn2 := makeFS(ctx, t, config)
	defer mnt2.Close()
	defer cancelFn2()

	if !mnt2.Conn.Protocol().HasInvalidate() {
		t.Skip("Old FUSE protocol")
	}

	const input1 = "input round one"
	p := path.Join(mnt1.Dir, PrivateName, "jdoe", "myfile")
	if err := ioutil.WriteFile(p, []byte(input1), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	syncFolderToServer(t, "jdoe", fs2)

	buf, err := ioutil.ReadFile(path.Join(mnt2.Dir, PrivateName, "jdoe", "myfile"))
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input1; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}

	if err := ioutil.Remove(path.Join(mnt1.Dir, PrivateName, "jdoe", "myfile")); err != nil {
		t.Fatal(err)
	}

	syncFolderToServer(t, "jdoe", fs2)

	if buf, err := ioutil.ReadFile(path.Join(mnt2.Dir, PrivateName, "jdoe", "myfile")); !ioutil.IsNotExist(err) {
		t.Fatalf("expected ENOENT: %v: %q", err, buf)
	}
}

func testForErrorText(t *testing.T, path string, expectedErr error,
	fileType string) {
	buf, err := ioutil.ReadFile(path)
	if err != nil {
		t.Fatalf("Bad error reading %s error file: %v", path, err)
	}

	var errors []libfs.JSONReportedError
	err = json.Unmarshal(buf, &errors)
	if err != nil {
		t.Fatalf("Couldn't unmarshal error file: %v. Full contents: %s",
			err, string(buf))
	}

	found := false
	for _, e := range errors {
		if e.Error == expectedErr.Error() {
			found = true
			break
		}
	}

	if !found {
		t.Errorf("%s error file did not contain the error %s. "+
			"Full contents: %s", fileType, expectedErr, buf)
	}
}

func TestErrorFile(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	config.SetReporter(libkbfs.NewReporterSimple(config.Clock(), 0))
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	libfs.AddRootWrapper(config)

	// cause an error by stating a non-existent user
	_, err := ioutil.Lstat(path.Join(mnt.Dir, PrivateName, "janedoe"))
	if err == nil {
		t.Fatal("Stat of non-existent user worked!")
	}

	// Make sure the root error file reads as expected
	expectedErr := fuse.ENOENT

	// test both the root error file and one in a directory
	testForErrorText(t, path.Join(mnt.Dir, libfs.ErrorFileName),
		expectedErr, "root")
	testForErrorText(t, path.Join(mnt.Dir, PublicName, libfs.ErrorFileName),
		expectedErr, "root")
	testForErrorText(t, path.Join(mnt.Dir, PrivateName, libfs.ErrorFileName),
		expectedErr, "root")

	// Create public and private jdoe TLFs.
	const b = "hello world"
	p := path.Join(mnt.Dir, PublicName, "jdoe", "myfile")
	if err := ioutil.WriteFile(p, []byte(b), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)
	p = path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	if err := ioutil.WriteFile(p, []byte(b), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	testForErrorText(
		t, path.Join(mnt.Dir, PublicName, "jdoe", libfs.ErrorFileName),
		expectedErr, "dir")
	testForErrorText(
		t, path.Join(mnt.Dir, PrivateName, "jdoe", libfs.ErrorFileName),
		expectedErr, "dir")
}

func TestInvalidateAcrossMounts(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config1 := libkbfs.MakeTestConfigOrBust(t, "user1",
		"user2")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config1)
	mnt1, fs1, cancelFn1 := makeFS(ctx, t, config1)
	defer mnt1.Close()
	defer cancelFn1()

	config2 := libkbfs.ConfigAsUser(config1, "user2")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config2)
	mnt2, fs2, cancelFn2 := makeFS(ctx, t, config2)
	defer mnt2.Close()
	defer cancelFn2()

	if !mnt2.Conn.Protocol().HasInvalidate() {
		t.Skip("Old FUSE protocol")
	}

	// user 1 writes one file to root and one to a sub directory
	const input1 = "input round one"
	myfile1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "myfile")
	if err := ioutil.WriteFile(myfile1, []byte(input1), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, myfile1)
	mydir1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "mydir")
	if err := ioutil.Mkdir(mydir1, 0755); err != nil {
		t.Fatal(err)
	}
	mydira1 := path.Join(mydir1, "a")
	if err := ioutil.WriteFile(mydira1, []byte(input1), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, mydira1)

	syncFolderToServer(t, "user1,user2", fs2)

	myfile2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "myfile")
	buf, err := ioutil.ReadFile(myfile2)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input1; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}

	mydir2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "mydir")
	mydira2 := path.Join(mydir2, "a")
	buf, err = ioutil.ReadFile(mydira2)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input1; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}

	// now remove the first file, and rename the second
	if err := ioutil.Remove(myfile1); err != nil {
		t.Fatal(err)
	}
	mydirb1 := path.Join(mydir1, "b")
	if err := ioutil.Rename(mydira1, mydirb1); err != nil {
		t.Fatal(err)
	}
	syncAll(t, "user1,user2", tlf.Private, fs1)

	syncFolderToServer(t, "user1,user2", fs2)

	// check everything from user 2's perspective
	if buf, err := ioutil.ReadFile(myfile2); !ioutil.IsNotExist(err) {
		t.Fatalf("expected ENOENT: %v: %q", err, buf)
	}
	if buf, err := ioutil.ReadFile(mydira2); !ioutil.IsNotExist(err) {
		t.Fatalf("expected ENOENT: %v: %q", err, buf)
	}

	checkDir(t, mydir2, map[string]fileInfoCheck{
		"b": func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input1)))
		},
	})

	mydirb2 := path.Join(mydir2, "b")
	buf, err = ioutil.ReadFile(mydirb2)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input1; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}
}

func TestInvalidateAppendAcrossMounts(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config1 := libkbfs.MakeTestConfigOrBust(t, "user1",
		"user2")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config1)
	mnt1, _, cancelFn1 := makeFS(ctx, t, config1)
	defer mnt1.Close()
	defer cancelFn1()

	config2 := libkbfs.ConfigAsUser(config1, "user2")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config2)
	mnt2, fs2, cancelFn2 := makeFS(ctx, t, config2)
	defer mnt2.Close()
	defer cancelFn2()

	if !mnt2.Conn.Protocol().HasInvalidate() {
		t.Skip("Old FUSE protocol")
	}

	// user 1 writes one file to root and one to a sub directory
	const input1 = "input round one"
	myfile1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "myfile")
	if err := ioutil.WriteFile(myfile1, []byte(input1), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, myfile1)
	syncFolderToServer(t, "user1,user2", fs2)
	myfile2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "myfile")
	buf, err := ioutil.ReadFile(myfile2)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input1; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}

	// user 1 append using libkbfs, to ensure that it doesn't flush
	// the whole page.
	const input2 = "input round two"
	{
		ctx := libcontext.BackgroundContextWithCancellationDelayer()
		defer testCleanupDelayer(ctx, t)

		jdoe := libkbfs.GetRootNodeOrBust(ctx, t, config1, "user1,user2", tlf.Private)

		ops := config1.KBFSOps()
		myfile, _, err := ops.Lookup(ctx, jdoe, jdoe.ChildName("myfile"))
		if err != nil {
			t.Fatal(err)
		}
		if err := ops.Write(
			ctx, myfile, []byte(input2), int64(len(input1))); err != nil {
			t.Fatal(err)
		}
		if err := ops.SyncAll(ctx, myfile.GetFolderBranch()); err != nil {
			t.Fatal(err)
		}
	}

	syncFolderToServer(t, "user1,user2", fs2)

	// check everything from user 2's perspective
	buf, err = ioutil.ReadFile(myfile2)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input1+input2; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}
}

func TestInvalidateRenameToUncachedDir(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config1 := libkbfs.MakeTestConfigOrBust(t, "user1",
		"user2")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config1)
	mnt1, fs1, cancelFn1 := makeFS(ctx, t, config1)
	defer mnt1.Close()
	defer cancelFn1()

	config2 := libkbfs.ConfigAsUser(config1, "user2")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config2)
	mnt2, fs2, cancelFn2 := makeFS(ctx, t, config2)
	defer mnt2.Close()
	defer cancelFn2()

	if !mnt2.Conn.Protocol().HasInvalidate() {
		t.Skip("Old FUSE protocol")
	}

	// user 1 writes one file to root and one to a sub directory
	const input1 = "input round one"
	myfile1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "myfile")
	if err := ioutil.WriteFile(myfile1, []byte(input1), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, myfile1)
	mydir1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "mydir")
	if err := ioutil.Mkdir(mydir1, 0755); err != nil {
		t.Fatal(err)
	}
	mydirfile1 := path.Join(mydir1, "myfile")

	syncFolderToServer(t, "user1,user2", fs2)
	myfile2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "myfile")
	f, err := os.OpenFile(myfile2, os.O_RDWR, 0644)
	if err != nil {
		t.Fatal(err)
	}
	// Call in a closure since `f` is overridden below.
	defer func() { syncAndClose(t, f) }()

	{
		buf := make([]byte, 4096)
		n, err := f.ReadAt(buf, 0)
		if err != nil && err != io.EOF {
			t.Fatal(err)
		}
		if g, e := string(buf[:n]), input1; g != e {
			t.Errorf("wrong content: %q != %q", g, e)
		}
	}

	// now rename the second into a directory that user 2 hasn't seen
	if err := ioutil.Rename(myfile1, mydirfile1); err != nil {
		t.Fatal(err)
	}
	syncAll(t, "user1,user2", tlf.Private, fs1)

	syncFolderToServer(t, "user1,user2", fs2)

	// user 2 should be able to write to its open file, and user 1
	// will see the change
	const input2 = "input round two"
	{
		n, err := f.WriteAt([]byte(input2), 0)
		if err != nil || n != len(input2) {
			t.Fatal(err)
		}
	}
	syncAndClose(t, f)
	f = nil

	syncFolderToServer(t, "user1,user2", fs1)

	buf, err := ioutil.ReadFile(mydirfile1)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input2; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}
}

func TestStatusFile(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()

	libfs.AddRootWrapper(config)

	jdoe := libkbfs.GetRootNodeOrBust(ctx, t, config, "jdoe", tlf.Public)
	mydir := path.Join(mnt.Dir, PublicName, "jdoe", "mydir")
	err := ioutil.Mkdir(mydir, 0755)
	require.NoError(t, err)

	ops := config.KBFSOps()
	status, _, err := ops.FolderStatus(ctx, jdoe.GetFolderBranch())
	require.NoError(t, err)

	checkStatus := func(dir string) {
		// Simply make sure the status in the file matches what we'd
		// expect.  Checking the exact content should be left for tests
		// within libkbfs.
		buf, err := ioutil.ReadFile(path.Join(dir, libfs.StatusFileName))
		require.NoError(t, err)

		var bufStatus libkbfs.FolderBranchStatus
		err = json.Unmarshal(buf, &bufStatus)
		require.NoError(t, err)

		// Use a fuzzy check on the timestamps, since it could include
		// monotonic clock stuff.
		require.True(t, timeEqualFuzzy(
			status.LocalTimestamp, bufStatus.LocalTimestamp, time.Millisecond))
		status.LocalTimestamp = bufStatus.LocalTimestamp

		// It's safe to compare the path slices with DeepEqual since
		// they will all be null for this test (nothing is dirtied).
		require.True(t, reflect.DeepEqual(status, bufStatus))
	}
	checkStatus(path.Join(mnt.Dir, PublicName, "jdoe"))
	checkStatus(mydir)
}

// TODO: remove once we have automatic conflict resolution tests
func TestUnstageFile(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config1 := libkbfs.MakeTestConfigOrBust(t, "user1",
		"user2")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config1)
	mnt1, fs1, cancelFn1 := makeFS(ctx, t, config1)
	defer mnt1.Close()
	defer cancelFn1()

	config2 := libkbfs.ConfigAsUser(config1, "user2")
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config2)
	mnt2, fs2, cancelFn2 := makeFS(ctx, t, config2)
	defer mnt2.Close()
	defer cancelFn2()

	if !mnt2.Conn.Protocol().HasInvalidate() {
		t.Skip("Old FUSE protocol")
	}

	// both users read the root dir first
	myroot1 := path.Join(mnt1.Dir, PrivateName, "user1,user2")
	myroot2 := path.Join(mnt2.Dir, PrivateName, "user1,user2")
	checkDir(t, myroot1, map[string]fileInfoCheck{})
	checkDir(t, myroot2, map[string]fileInfoCheck{})

	// turn updates off for user 2
	rootNode2 := libkbfs.GetRootNodeOrBust(ctx, t, config2, "user1,user2", tlf.Private)
	_, err := libkbfs.DisableUpdatesForTesting(config2,
		rootNode2.GetFolderBranch())
	if err != nil {
		t.Fatalf("Couldn't pause user 2 updates")
	}
	err = libkbfs.DisableCRForTesting(config2, rootNode2.GetFolderBranch())
	if err != nil {
		t.Fatalf("Couldn't disable user 2 CR")
	}

	// user1 writes a file and makes a few directories
	const input1 = "input round one"
	myfile1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "myfile")
	if err := ioutil.WriteFile(myfile1, []byte(input1), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, myfile1)
	mydir1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "mydir")
	if err := ioutil.Mkdir(mydir1, 0755); err != nil {
		t.Fatal(err)
	}
	mysubdir1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "mydir",
		"mysubdir")
	if err := ioutil.Mkdir(mysubdir1, 0755); err != nil {
		t.Fatal(err)
	}
	syncAll(t, "user1,user2", tlf.Private, fs1)

	// user2 does similar
	const input2 = "input round two"
	myfile2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "myfile")
	if err := ioutil.WriteFile(myfile2, []byte(input2), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, myfile2)
	mydir2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "mydir")
	if err := ioutil.Mkdir(mydir2, 0755); err != nil {
		t.Fatal(err)
	}
	myothersubdir2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "mydir",
		"myothersubdir")
	if err := ioutil.Mkdir(myothersubdir2, 0755); err != nil {
		t.Fatal(err)
	}
	syncAll(t, "user1,user2", tlf.Private, fs2)

	// verify that they don't see each other's files
	checkDir(t, mydir1, map[string]fileInfoCheck{
		"mysubdir": mustBeDir,
	})
	checkDir(t, mydir2, map[string]fileInfoCheck{
		"myothersubdir": mustBeDir,
	})

	// now unstage user 2 and they should see the same stuff
	unstageFile2 := path.Join(mnt2.Dir, PrivateName, "user1,user2",
		libfs.UnstageFileName)
	if err := ioutil.WriteFile(unstageFile2, []byte{1}, 0222); err != nil {
		t.Fatal(err)
	}

	syncFolderToServer(t, "user1,user2", fs2)

	// They should see identical folders now
	checkDir(t, mydir1, map[string]fileInfoCheck{
		"mysubdir": mustBeDir,
	})
	checkDir(t, mydir2, map[string]fileInfoCheck{
		"mysubdir": mustBeDir,
	})

	buf, err := ioutil.ReadFile(myfile1)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input1; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}
	buf, err = ioutil.ReadFile(myfile2)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input1; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}
}

func TestSimpleCRNoConflict(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config1 := libkbfs.MakeTestConfigOrBust(t, "user1",
		"user2")
	mnt1, fs1, cancelFn1 := makeFS(ctx, t, config1)
	defer mnt1.Close()
	defer cancelFn1()
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config1)

	config2 := libkbfs.ConfigAsUser(config1, "user2")
	mnt2, fs2, cancelFn2 := makeFS(ctx, t, config2)
	defer mnt2.Close()
	defer cancelFn2()
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config2)

	if !mnt2.Conn.Protocol().HasInvalidate() {
		t.Skip("Old FUSE protocol")
	}

	root1 := path.Join(mnt1.Dir, PrivateName, "user1,user2")
	root2 := path.Join(mnt2.Dir, PrivateName, "user1,user2")
	// Please create TLF here first
	d1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "D")
	d2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "E")
	if err := ioutil.Mkdir(d1, 0755); err != nil {
		t.Fatal("Mkdir failed")
	}
	syncAll(t, "user1,user2", tlf.Private, fs1)
	syncFolderToServer(t, "user1,user2", fs2)
	if err := ioutil.Mkdir(d2, 0755); err != nil {
		t.Fatal("Mkdir failed")
	}
	syncAll(t, "user1,user2", tlf.Private, fs2)
	syncFolderToServer(t, "user1,user2", fs1)

	// disable updates for user 2
	disableUpdatesFile := path.Join(mnt2.Dir, PrivateName, "user1,user2",
		libfs.DisableUpdatesFileName)
	if err := ioutil.WriteFile(disableUpdatesFile,
		[]byte("off"), 0644); err != nil {
		t.Fatal(err)
	}

	// user1 writes a file and makes a few directories
	const input1 = "input round one"
	file1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "file1")
	if err := ioutil.WriteFile(file1, []byte(input1), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, file1)
	dir1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "dir")
	if err := ioutil.Mkdir(dir1, 0755); err != nil {
		t.Fatal(err)
	}
	subdir1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "dir", "subdir1")
	if err := ioutil.Mkdir(subdir1, 0755); err != nil {
		t.Fatal(err)
	}
	syncAll(t, "user1,user2", tlf.Private, fs1)

	// user2 does similar
	const input2 = "input round two two two"
	file2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "file2")
	if err := ioutil.WriteFile(file2, []byte(input2), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, file2)
	dir2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "dir")
	if err := ioutil.Mkdir(dir2, 0755); err != nil {
		t.Fatal(err)
	}
	subdir2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "dir", "subdir2")
	if err := ioutil.Mkdir(subdir2, 0755); err != nil {
		t.Fatal(err)
	}
	syncAll(t, "user1,user2", tlf.Private, fs2)

	// verify that they don't see each other's files
	checkDir(t, root1, map[string]fileInfoCheck{
		"file1": func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input1)))
		},
		"dir": mustBeDir,
		"D":   mustBeDir,
		"E":   mustBeDir,
	})
	checkDir(t, dir1, map[string]fileInfoCheck{
		"subdir1": mustBeDir,
	})
	checkDir(t, root2, map[string]fileInfoCheck{
		"file2": func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input2)))
		},
		"dir": mustBeDir,
		"D":   mustBeDir,
		"E":   mustBeDir,
	})
	checkDir(t, dir2, map[string]fileInfoCheck{
		"subdir2": mustBeDir,
	})

	// now re-enable user 2 updates and CR, and the merge should happen
	enableUpdatesFile := path.Join(mnt2.Dir, PrivateName, "user1,user2",
		libfs.EnableUpdatesFileName)
	if err := ioutil.WriteFile(enableUpdatesFile,
		[]byte("on"), 0644); err != nil {
		t.Fatal(err)
	}

	syncFolderToServer(t, "user1,user2", fs2)
	syncFolderToServer(t, "user1,user2", fs1)

	// They should see identical folders now (conflict-free merge)
	checkDir(t, root1, map[string]fileInfoCheck{
		"file1": func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input1)))
		},
		"file2": func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input2)))
		},
		"dir": mustBeDir,
		"D":   mustBeDir,
		"E":   mustBeDir,
	})
	checkDir(t, dir1, map[string]fileInfoCheck{
		"subdir1": mustBeDir,
		"subdir2": mustBeDir,
	})
	checkDir(t, root2, map[string]fileInfoCheck{
		"file1": func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input1)))
		},
		"file2": func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input2)))
		},
		"dir": mustBeDir,
		"D":   mustBeDir,
		"E":   mustBeDir,
	})
	checkDir(t, dir2, map[string]fileInfoCheck{
		"subdir1": mustBeDir,
		"subdir2": mustBeDir,
	})

	buf, err := ioutil.ReadFile(file1)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input1; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}
	file2u1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "file2")
	buf, err = ioutil.ReadFile(file2u1)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input2; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}

	file1u2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "file1")
	buf, err = ioutil.ReadFile(file1u2)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input1; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}
	buf, err = ioutil.ReadFile(file2)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input2; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}
}

func TestSimpleCRConflictOnOpenFiles(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config1 := libkbfs.MakeTestConfigOrBust(t, "user1",
		"user2")
	mnt1, fs1, cancelFn1 := makeFS(ctx, t, config1)
	defer mnt1.Close()
	defer cancelFn1()
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config1)

	config2 := libkbfs.ConfigAsUser(config1, "user2")
	mnt2, fs2, cancelFn2 := makeFS(ctx, t, config2)
	defer mnt2.Close()
	defer cancelFn2()
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config2)

	if !mnt2.Conn.Protocol().HasInvalidate() {
		t.Skip("Old FUSE protocol")
	}

	now := time.Now()
	var clock clocktest.TestClock
	clock.Set(now)
	config2.SetClock(&clock)

	root1 := path.Join(mnt1.Dir, PrivateName, "user1,user2")
	root2 := path.Join(mnt2.Dir, PrivateName, "user1,user2")

	// both users should mutate the dir first
	d1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "D")
	d2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "E")
	if err := ioutil.Mkdir(d1, 0755); err != nil {
		t.Fatal("Mkdir failed")
	}
	syncFolderToServer(t, "user1,user2", fs2)
	if err := ioutil.Mkdir(d2, 0755); err != nil {
		t.Fatal("Mkdir failed")
	}
	syncFolderToServer(t, "user1,user2", fs1)

	// disable updates for user 2
	disableUpdatesFile := path.Join(mnt2.Dir, PrivateName, "user1,user2",
		libfs.DisableUpdatesFileName)
	if err := ioutil.WriteFile(disableUpdatesFile,
		[]byte("off"), 0644); err != nil {
		t.Fatal(err)
	}

	// user1 creates and writes a file
	file1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "f")
	f1, err := os.Create(file1)
	if err != nil {
		t.Fatal(err)
	}
	defer syncAndClose(t, f1)

	const input1 = "hello"
	{
		n, err := f1.WriteAt([]byte(input1), 0)
		if err != nil || n != len(input1) {
			t.Fatal(err)
		}
		if err := f1.Sync(); err != nil {
			t.Fatal(err)
		}
	}

	// user2 creates and writes a file
	file2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "f")
	f2, err := os.Create(file2)
	if err != nil {
		t.Fatal(err)
	}
	defer syncAndClose(t, f2)

	const input2 = "ohell"
	{
		n, err := f2.WriteAt([]byte(input2), 0)
		if err != nil || n != len(input2) {
			t.Fatal(err)
		}
		if err := f2.Sync(); err != nil {
			t.Fatal(err)
		}
	}

	// now re-enable user 2 updates and CR, and the merge should happen
	enableUpdatesFile := path.Join(mnt2.Dir, PrivateName, "user1,user2",
		libfs.EnableUpdatesFileName)
	if err := ioutil.WriteFile(enableUpdatesFile,
		[]byte("on"), 0644); err != nil {
		t.Fatal(err)
	}

	syncFolderToServer(t, "user1,user2", fs2)
	syncFolderToServer(t, "user1,user2", fs1)

	// They should both be able to read their past writes.
	{
		buf := make([]byte, len(input1))
		n, err := f1.ReadAt(buf, 0)
		if err != nil || n != len(input1) {
			t.Fatal(err)
		}
		if g, e := string(buf), input1; g != e {
			t.Errorf("Unexpected read on f2: %s vs %s", g, e)
		}
	}
	{
		buf := make([]byte, len(input2))
		n, err := f2.ReadAt(buf, 0)
		if err != nil || n != len(input2) {
			t.Fatal(err)
		}
		if g, e := string(buf), input2; g != e {
			t.Errorf("Unexpected read on f2: %s vs %s", g, e)
		}
	}

	// They should see the conflict.
	cre := libkbfs.WriterDeviceDateConflictRenamer{}
	checkDir(t, root1, map[string]fileInfoCheck{
		"f": func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input1)))
		},
		cre.ConflictRenameHelper(now, "user2", "dev1", "f"): func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input2)))
		},
		"D": mustBeDir,
		"E": mustBeDir,
	})
	checkDir(t, root2, map[string]fileInfoCheck{
		"f": func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input1)))
		},
		cre.ConflictRenameHelper(now, "user2", "dev1", "f"): func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input2)))
		},
		"D": mustBeDir,
		"E": mustBeDir,
	})

	input3 := " world"
	{
		n, err := f1.WriteAt([]byte(input3), int64(len(input1)))
		if err != nil || n != len(input3) {
			t.Fatal(err)
		}
		if err := f1.Sync(); err != nil {
			t.Fatal(err)
		}
	}

	syncFolderToServer(t, "user1,user2", fs2)

	input4 := " dlrow"
	{
		n, err := f2.WriteAt([]byte(input4), int64(len(input2)))
		if err != nil || n != len(input4) {
			t.Fatal(err)
		}
		if err := f2.Sync(); err != nil {
			t.Fatal(err)
		}
	}

	syncFolderToServer(t, "user1,user2", fs1)

	buf, err := ioutil.ReadFile(file1)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input1+input3; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}
	buf, err = ioutil.ReadFile(file2)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input1+input3; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}

	filec1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", cre.ConflictRenameHelper(now, "user2", "dev1", "f"))
	filec2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", cre.ConflictRenameHelper(now, "user2", "dev1", "f"))
	buf, err = ioutil.ReadFile(filec1)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input2+input4; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}
	buf, err = ioutil.ReadFile(filec2)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input2+input4; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}
}

func TestSimpleCRConflictOnOpenMergedFile(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config1 := libkbfs.MakeTestConfigOrBust(t, "user1",
		"user2")
	mnt1, fs1, cancelFn1 := makeFS(ctx, t, config1)
	defer mnt1.Close()
	defer cancelFn1()
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config1)

	config2 := libkbfs.ConfigAsUser(config1, "user2")
	mnt2, fs2, cancelFn2 := makeFS(ctx, t, config2)
	defer mnt2.Close()
	defer cancelFn2()
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config2)

	if !mnt2.Conn.Protocol().HasInvalidate() {
		t.Skip("Old FUSE protocol")
	}

	now := time.Now()
	var clock clocktest.TestClock
	clock.Set(now)
	config2.SetClock(&clock)

	root1 := path.Join(mnt1.Dir, PrivateName, "user1,user2")
	root2 := path.Join(mnt2.Dir, PrivateName, "user1,user2")
	// both users should mutate the dir first
	d1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "D")
	d2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "E")
	if err := ioutil.Mkdir(d1, 0755); err != nil {
		t.Fatal("Mkdir failed")
	}
	syncFolderToServer(t, "user1,user2", fs2)
	if err := ioutil.Mkdir(d2, 0755); err != nil {
		t.Fatal("Mkdir failed")
	}
	syncFolderToServer(t, "user1,user2", fs1)

	// disable updates for user 2
	disableUpdatesFile := path.Join(mnt2.Dir, PrivateName, "user1,user2",
		libfs.DisableUpdatesFileName)
	if err := ioutil.WriteFile(disableUpdatesFile,
		[]byte("off"), 0644); err != nil {
		t.Fatal(err)
	}

	// user1 creates and writes a file
	file1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "f")
	f1, err := os.Create(file1)
	if err != nil {
		t.Fatal(err)
	}
	defer syncAndClose(t, f1)

	const input1 = "hello"
	{
		n, err := f1.WriteAt([]byte(input1), 0)
		if err != nil || n != len(input1) {
			t.Fatal(err)
		}
		if err := f1.Sync(); err != nil {
			t.Fatal(err)
		}
	}

	// user2 creates a directory and writes a file to it
	dir2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "f")
	if err := ioutil.Mkdir(dir2, 0755); err != nil {
		t.Fatal(err)
	}
	file2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "f", "foo")
	f2, err := os.Create(file2)
	if err != nil {
		t.Fatal(err)
	}
	defer syncAndClose(t, f2)

	const input2 = "ohell"
	{
		n, err := f2.WriteAt([]byte(input2), 0)
		if err != nil || n != len(input2) {
			t.Fatal(err)
		}
		if err := f2.Sync(); err != nil {
			t.Fatal(err)
		}
	}

	// now re-enable user 2 updates and CR, and the merge should happen
	enableUpdatesFile := path.Join(mnt2.Dir, PrivateName, "user1,user2",
		libfs.EnableUpdatesFileName)
	if err := ioutil.WriteFile(enableUpdatesFile,
		[]byte("on"), 0644); err != nil {
		t.Fatal(err)
	}

	syncFolderToServer(t, "user1,user2", fs2)
	syncFolderToServer(t, "user1,user2", fs1)

	// They should both be able to read their past writes.
	{
		buf := make([]byte, len(input1))
		n, err := f1.ReadAt(buf, 0)
		if err != nil || n != len(input1) {
			t.Fatal(err)
		}
		if g, e := string(buf), input1; g != e {
			t.Errorf("Unexpected read on f2: %s vs %s", g, e)
		}
	}
	{
		buf := make([]byte, len(input2))
		n, err := f2.ReadAt(buf, 0)
		if err != nil || n != len(input2) {
			t.Fatal(err)
		}
		if g, e := string(buf), input2; g != e {
			t.Errorf("Unexpected read on f2: %s vs %s", g, e)
		}
	}

	// They should see the conflict.
	cre := libkbfs.WriterDeviceDateConflictRenamer{}
	fcr := cre.ConflictRenameHelper(now, "user1", "dev1", "f")
	checkDir(t, root1, map[string]fileInfoCheck{
		fcr: func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input1)))
		},
		"f": mustBeDir,
		"D": mustBeDir,
		"E": mustBeDir,
	})
	checkDir(t, root2, map[string]fileInfoCheck{
		fcr: func(fi os.FileInfo) error {
			return mustBeFileWithSize(fi, int64(len(input1)))
		},
		"f": mustBeDir,
		"D": mustBeDir,
		"E": mustBeDir,
	})

	input3 := " world"
	{
		n, err := f1.WriteAt([]byte(input3), int64(len(input1)))
		if err != nil || n != len(input3) {
			t.Fatal(err)
		}
		if err := f1.Sync(); err != nil {
			t.Fatal(err)
		}
	}

	syncFolderToServer(t, "user1,user2", fs2)

	input4 := " dlrow"
	{
		n, err := f2.WriteAt([]byte(input4), int64(len(input2)))
		if err != nil || n != len(input4) {
			t.Fatal(err)
		}
		if err := f2.Sync(); err != nil {
			t.Fatal(err)
		}
	}

	syncFolderToServer(t, "user1,user2", fs1)

	file2u1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "f", "foo")
	buf, err := ioutil.ReadFile(file2u1)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input2+input4; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}
	buf, err = ioutil.ReadFile(file2)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input2+input4; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}

	filec1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", fcr)
	filec2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", fcr)
	buf, err = ioutil.ReadFile(filec1)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input1+input3; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}
	buf, err = ioutil.ReadFile(filec2)
	if err != nil {
		t.Fatal(err)
	}
	if g, e := string(buf), input1+input3; g != e {
		t.Errorf("wrong content: %q != %q", g, e)
	}
}

func TestKbfsFileInfo(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config1 := libkbfs.MakeTestConfigOrBust(t, "user1", "user2")
	mnt1, _, cancelFn1 := makeFS(ctx, t, config1)
	defer mnt1.Close()
	defer cancelFn1()
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config1)

	config2 := libkbfs.ConfigAsUser(config1, "user2")
	mnt2, fs2, cancelFn2 := makeFS(ctx, t, config2)
	defer mnt2.Close()
	defer cancelFn2()
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config2)

	// Turn off the prefetcher to avoid races when reading the file info file.
	ch := config2.BlockOps().TogglePrefetcher(false)
	select {
	case <-ch:
	case <-ctx.Done():
		t.Fatal(ctx.Err())
	}

	mydir1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "mydir")
	if err := ioutil.Mkdir(mydir1, 0755); err != nil {
		t.Fatal(err)
	}
	myfile1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "mydir", "myfile")
	if err := ioutil.WriteFile(myfile1, []byte("foo"), 0644); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, myfile1)
	syncFolderToServer(t, "user1,user2", fs2)
	fi2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "mydir", libfs.FileInfoPrefix+"myfile")
	bs, err := ioutil.ReadFile(fi2)
	if err != nil {
		t.Fatal(err)
	}
	var dst libkbfs.NodeMetadata
	err = json.Unmarshal(bs, &dst)
	if err != nil {
		t.Fatal(err)
	}
	if dst.LastWriterUnverified != kbname.NormalizedUsername("user1") {
		t.Fatalf("Expected user1, %v raw %X", dst, bs)
	}
}

func TestDirSyncAll(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config1 := libkbfs.MakeTestConfigOrBust(t, "user1", "user2")
	mnt1, _, cancelFn1 := makeFS(ctx, t, config1)
	defer mnt1.Close()
	defer cancelFn1()
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config1)

	config2 := libkbfs.ConfigAsUser(config1, "user2")
	mnt2, fs2, cancelFn2 := makeFS(ctx, t, config2)
	defer mnt2.Close()
	defer cancelFn2()
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config2)

	mydir1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "mydir")
	if err := ioutil.Mkdir(mydir1, 0755); err != nil {
		t.Fatal(err)
	}
	myfile1 := path.Join(mnt1.Dir, PrivateName, "user1,user2", "mydir", "myfile")
	data := []byte("foo")
	if err := ioutil.WriteFile(myfile1, data, 0644); err != nil {
		t.Fatal(err)
	}

	d, err := os.Open(mydir1)
	if err != nil {
		t.Fatal(err)
	}
	defer d.Close()
	err = d.Sync()
	if err != nil {
		t.Fatal(err)
	}

	syncFolderToServer(t, "user1,user2", fs2)
	myfile2 := path.Join(mnt2.Dir, PrivateName, "user1,user2", "mydir", "myfile")
	gotData, err := ioutil.ReadFile(myfile2)
	if err != nil {
		t.Fatal(err)
	}
	if !bytes.Equal(data, gotData) {
		t.Fatalf("Expected=%v, got=%v", data, gotData)
	}
}

// Regression test for KBFS-2853.
func TestInodes(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)

	p := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	if err := ioutil.WriteFile(p, []byte("fake binary"), 0755); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	getInode := func(p string) uint64 {
		fi, err := ioutil.Lstat(p)
		if err != nil {
			t.Fatal(err)
		}
		stat, ok := fi.Sys().(*syscall.Stat_t)
		if !ok {
			t.Fatalf("Not a syscall.Stat_t")
		}
		return stat.Ino
	}
	inode := getInode(p)

	t.Log("Rename file and make sure inode hasn't changed.")
	p2 := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile2")
	if err := ioutil.Rename(p, p2); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p2)

	inode2 := getInode(p2)
	if inode != inode2 {
		t.Fatalf("Inode changed after rename: %d vs %d", inode, inode2)
	}

	t.Log("A new file with the previous name should get a new inode")

	if err := ioutil.WriteFile(p, []byte("more fake data"), 0755); err != nil {
		t.Fatal(err)
	}
	syncFilename(t, p)

	inode3 := getInode(p)
	if inode == inode3 {
		t.Fatal("New and old files have the same inode")
	}
}

func TestHardLinkNotSupported(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)

	checkLinkErr := func(old, new string, checkPermErr bool) {
		err := os.Link(old, new)
		linkErr, ok := errors.Cause(err).(*os.LinkError)
		require.True(t, ok)
		if checkPermErr && runtime.GOOS == "darwin" {
			// On macOS, in directories without the write bit set like
			// /keybase and /keybase/private, the `Link` call gets an
			// `EPERM` error back from the `Access()` Fuse request,
			// and never even tries calling `Link()`.
			require.Equal(t, syscall.EPERM, linkErr.Err)
		} else {
			require.Equal(t, syscall.ENOTSUP, linkErr.Err)
		}
	}

	t.Log("Test hardlink in root of TLF")
	old := path.Join(mnt.Dir, PrivateName, "jdoe", "myfile")
	err := ioutil.WriteFile(old, []byte("hello"), 0755)
	require.NoError(t, err)
	syncFilename(t, old)
	new := path.Join(mnt.Dir, PrivateName, "jdoe", "hardlink")
	checkLinkErr(old, new, false)

	t.Log("Test hardlink in subdir of TLF")
	mydir := path.Join(mnt.Dir, PrivateName, "jdoe", "mydir")
	err = ioutil.Mkdir(mydir, 0755)
	require.NoError(t, err)
	old2 := path.Join(mydir, "myfile")
	err = ioutil.WriteFile(old2, []byte("hello"), 0755)
	require.NoError(t, err)
	syncFilename(t, old2)
	new2 := path.Join(mydir, "hardlink")
	checkLinkErr(old2, new2, false)

	t.Log("Test hardlink in folder list")
	old3 := path.Join(mnt.Dir, PrivateName, ".kbfs_status")
	new3 := path.Join(mnt.Dir, PrivateName, "hardlink")
	checkLinkErr(old3, new3, true)

	t.Log("Test hardlink in root")
	old4 := path.Join(mnt.Dir, ".kbfs_status")
	new4 := path.Join(mnt.Dir, "hardlink")
	checkLinkErr(old4, new4, true)
}

func TestOpenFileCount(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)

	p := path.Join(mnt.Dir, libfs.OpenFileCountFileName)
	checkCount := func(expected int64) {
		f, err := os.Open(p)
		require.NoError(t, err)
		defer f.Close()

		b, err := ioutil.ReadAll(f)
		require.NoError(t, err)

		i, err := strconv.ParseInt(string(b), 10, 64)
		require.NoError(t, err)
		require.Equal(t, expected, i)
	}

	checkCount(0)

	_, err := ioutil.Lstat(path.Join(mnt.Dir, PrivateName))
	require.NoError(t, err)
	checkCount(1)

	_, err = ioutil.Lstat(path.Join(mnt.Dir, PublicName))
	require.NoError(t, err)
	checkCount(2)

	_, err = ioutil.Lstat(path.Join(mnt.Dir, PrivateName))
	require.NoError(t, err)
	checkCount(2)

	err = ioutil.Mkdir(
		path.Join(mnt.Dir, PrivateName, "jdoe", "d"), os.ModeDir)
	require.NoError(t, err)
	checkCount(4)
}

func TestUpdateHistoryFile(t *testing.T) {
	ctx := libcontext.BackgroundContextWithCancellationDelayer()
	defer testCleanupDelayer(ctx, t)
	config := libkbfs.MakeTestConfigOrBust(t, "jdoe")
	mnt, _, cancelFn := makeFS(ctx, t, config)
	defer mnt.Close()
	defer cancelFn()
	defer libkbfs.CheckConfigAndShutdown(ctx, t, config)

	libfs.AddRootWrapper(config)

	t.Log("Make several revisions")
	p := path.Join(mnt.Dir, PrivateName, "jdoe")
	for i := 0; i < 10; i++ {
		file := path.Join(p, fmt.Sprintf("foo-%d", i))
		f, err := os.Create(file)
		require.NoError(t, err)
		syncAndClose(t, f)
	}

	t.Log("Read a revision range")
	histPrefix := path.Join(p, libfs.UpdateHistoryFileName)
	fRange, err := os.Open(histPrefix + ".3-5")
	require.NoError(t, err)
	defer fRange.Close()
	b, err := ioutil.ReadAll(fRange)
	require.NoError(t, err)
	var histRange libkbfs.TLFUpdateHistory
	err = json.Unmarshal(b, &histRange)
	require.NoError(t, err)
	require.Len(t, histRange.Updates, 3)

	t.Log("Read a single revision")
	fSingle, err := os.Open(histPrefix + ".7")
	require.NoError(t, err)
	defer fSingle.Close()
	b, err = ioutil.ReadAll(fSingle)
	require.NoError(t, err)
	var histSingle libkbfs.TLFUpdateHistory
	err = json.Unmarshal(b, &histSingle)
	require.NoError(t, err)
	require.Len(t, histSingle.Updates, 1)

	t.Log("Read the entire history")
	fAll, err := os.Open(histPrefix)
	require.NoError(t, err)
	defer fAll.Close()
	b, err = ioutil.ReadAll(fAll)
	require.NoError(t, err)
	var histAll libkbfs.TLFUpdateHistory
	err = json.Unmarshal(b, &histAll)
	require.NoError(t, err)
	require.Len(t, histAll.Updates, 11)
}