fs/manifestfs_test.go - gitfs - Git at Google

 // Copyright 2016 Google Inc. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //    http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 package fs

 import (
 	"fmt"
 	"io/ioutil"
 	"os"
 	"path/filepath"
 	"reflect"
 	"sort"
 	"syscall"
 	"testing"
 	"time"

 	"github.com/google/slothfs/cache"
 	"github.com/google/slothfs/gitiles"
 	"github.com/google/slothfs/manifest"
 	"github.com/hanwen/go-fuse/fuse"
 	"github.com/hanwen/go-fuse/fuse/nodefs"
 )

 func newManifestTestFixture(mf *manifest.Manifest) (*testFixture, error) {
 	fix, err := newTestFixture()
 	if err != nil {
 		return nil, err
 	}

 	opts := ManifestOptions{
 		Manifest: mf,
 	}

 	fs, err := NewManifestFS(fix.service, fix.cache, opts)
 	if err != nil {
 		return nil, err
 	}
 	if err := fix.mount(fs); err != nil {
 		return nil, err
 	}

 	return fix, nil
 }

 func TestManifestFSCloneOption(t *testing.T) {
 	mf := *testManifest
 	for i := range mf.Project {
 		mf.Project[i].CloneDepth = "1"
 	}

 	fix, err := newManifestTestFixture(&mf)
 	if err != nil {
 		t.Fatalf("newManifestTestFixture: %v", err)
 	}
 	defer fix.cleanup()

 	fs := fix.root.(*manifestFSRoot)
 	ch := fs.Inode()
 	for _, n := range []string{"build", "kati", "AUTHORS"} {
 		newCh := ch.GetChild(n)
 		if ch == nil {
 			t.Fatalf("node for %q not found. Have %s", n, ch.Children())
 		}
 		ch = newCh
 	}

 	giNode, ok := ch.Node().(*gitilesNode)
 	if !ok {
 		t.Fatalf("got node type %T, want *gitilesNode", ch.Node())
 	}

 	if giNode.clone {
 		t.Errorf("file had clone set.")
 	}
 }

 func TestManifestFSTimestamps(t *testing.T) {
 	fix, err := newManifestTestFixture(testManifest)
 	if err != nil {
 		t.Fatal("newTestFixture", err)
 	}
 	defer fix.cleanup()

 	var zeroFiles []string
 	if err := filepath.Walk(fix.mntDir, func(n string, fi os.FileInfo, err error) error {
 		if fi != nil && fi.ModTime().UnixNano() == 0 {
 			r, _ := filepath.Rel(fix.mntDir, n)
 			zeroFiles = append(zeroFiles, r)
 		}
 		return nil
 	}); err != nil {
 		t.Fatalf("Walk: %v", err)
 	}
 	if len(zeroFiles) > 0 {
 		sort.Strings(zeroFiles)
 		t.Errorf("found files with zero timestamps: %v", zeroFiles)
 	}
 }

 func TestManifestFSBasic(t *testing.T) {
 	fix, err := newManifestTestFixture(testManifest)
 	if err != nil {
 		t.Fatal("newTestFixture", err)
 	}
 	defer fix.cleanup()

 	fn := filepath.Join(fix.mntDir, "build", "kati", "AUTHORS")
 	fi, err := os.Lstat(fn)
 	if err != nil {
 		t.Fatalf("Lstat(%s): %v", fn, err)
 	}
 	if fi.Size() != 373 {
 		t.Errorf("got size %d want %d", fi.Size(), 373)
 	}

 	contents, err := ioutil.ReadFile(fn)
 	if err != nil {
 		t.Fatalf("ReadFile(%s): %v", fn, err)
 	}

 	want := testGitiles["/platform/build/kati/+show/ce34badf691d36e8048b63f89d1a86ee5fa4325c/AUTHORS?format=TEXT"]
 	if string(contents) != want {
 		t.Fatalf("got %q, want %q", contents, want)
 	}

 	copyPath := filepath.Join(fix.mntDir, "build", "copydest")
 	if copyFI, err := os.Lstat(copyPath); err != nil {
 		t.Errorf("Lstat(%s): %v", copyPath, err)
 	} else {
 		copyStat := copyFI.Sys().(*syscall.Stat_t)
 		origStat := fi.Sys().(*syscall.Stat_t)

 		if !reflect.DeepEqual(copyStat, origStat) {
 			t.Errorf("got stat %v, want %v", copyStat, origStat)
 		}
 	}

 	linkPath := filepath.Join(fix.mntDir, "build", "linkdest")
 	if got, err := os.Readlink(linkPath); err != nil {
 		t.Errorf("Readlink(%s): %v", linkPath, err)
 	} else if want := "kati/AUTHORS"; got != want {
 		t.Errorf("Readlink(%s) = %q, want %q", linkPath, got, want)
 	}
 }

 func TestManifestFSXMLFile(t *testing.T) {
 	fix, err := newManifestTestFixture(testManifest)
 	if err != nil {
 		t.Fatal("newTestFixture", err)
 	}
 	defer fix.cleanup()

 	xmlPath := filepath.Join(fix.mntDir, ".slothfs", "manifest.xml")
 	fuseMF, err := manifest.ParseFile(xmlPath)
 	if err != nil {
 		t.Fatalf("ParseFile(%s): %v", xmlPath, err)
 	}

 	if !reflect.DeepEqual(fuseMF, testManifest) {
 		t.Errorf("read back manifest %v, want %v", fuseMF, testManifest)
 	}
 }

 type testFixture struct {
 	dir        string
 	mntDir     string
 	server     *fuse.Server
 	cache      *cache.Cache
 	testServer *testServer
 	service    *gitiles.Service
 	root       nodefs.Node
 }

 func (f *testFixture) cleanup() {
 	if f.testServer != nil {
 		f.testServer.listener.Close()
 	}
 	if f.server != nil {
 		f.server.Unmount()
 	}
 	os.RemoveAll(f.dir)
 }

 func newTestFixture() (*testFixture, error) {
 	d, err := ioutil.TempDir("", "multifstest")
 	if err != nil {
 		return nil, err
 	}

 	fixture := &testFixture{dir: d}

 	fixture.cache, err = cache.NewCache(filepath.Join(d, "/cache"), cache.Options{})
 	if err != nil {
 		return nil, err
 	}

 	fixture.testServer, err = newTestServer()
 	if err != nil {
 		return nil, err
 	}

 	fixture.service, err = gitiles.NewService(gitiles.Options{
 		Address: fmt.Sprintf("http://%s", fixture.testServer.addr),
 	})
 	if err != nil {
 		return nil, err
 	}

 	return fixture, nil
 }

 func (f *testFixture) mount(root nodefs.Node) error {
 	f.mntDir = filepath.Join(f.dir, "mnt")
 	if err := os.Mkdir(f.mntDir, 0755); err != nil {
 		return err
 	}

 	fuseOpts := &nodefs.Options{
 		EntryTimeout:    time.Hour,
 		NegativeTimeout: time.Hour,
 		AttrTimeout:     time.Hour,
 	}

 	var err error
 	f.server, _, err = nodefs.MountRoot(f.mntDir, root, fuseOpts)
 	if err != nil {
 		return err
 	}

 	if fuseDebug {
 		f.server.SetDebug(true)
 	}
 	go f.server.Serve()

 	f.root = root
 	return nil
 }

 func TestMultiFSBrokenXML(t *testing.T) {
 	fix, err := newTestFixture()
 	if err != nil {
 		t.Fatalf("newTestFixture: %v", err)
 	}
 	defer fix.cleanup()

 	brokenXMLFile := filepath.Join(fix.dir, "broken.xml")
 	if err := ioutil.WriteFile(brokenXMLFile, []byte("I'm not XML."), 0644); err != nil {
 		t.Errorf("WriteFile(%s): %v", brokenXMLFile, err)
 	}

 	opts := MultiFSOptions{}
 	fs := NewMultiFS(fix.service, fix.cache, opts)

 	if err := fix.mount(fs); err != nil {
 		t.Fatalf("mount: %v", err)
 	}

 	if err := os.Symlink(brokenXMLFile, filepath.Join(fix.mntDir, "config", "ws")); err == nil {
 		t.Fatalf("want error for broken XML file")
 	}
 }

 func TestMultiFSBasic(t *testing.T) {
 	fix, err := newTestFixture()
 	if err != nil {
 		t.Fatalf("newTestFixture: %v", err)
 	}
 	defer fix.cleanup()

 	xmlFile := filepath.Join(fix.dir, "manifest.xml")
 	if err := ioutil.WriteFile(xmlFile, []byte(testManifestXML), 0644); err != nil {
 		t.Errorf("WriteFile(%s): %v", xmlFile, err)
 	}

 	opts := MultiFSOptions{}
 	fs := NewMultiFS(fix.service, fix.cache, opts)

 	if err := fix.mount(fs); err != nil {
 		t.Fatalf("mount: %v", err)
 	}

 	wsDir := filepath.Join(fix.mntDir, "ws")
 	if fi, err := os.Lstat(wsDir); err == nil {
 		t.Fatalf("got %v, want non-existent workspace dir", fi)
 	}

 	configName := filepath.Join(fix.mntDir, "config", "ws")
 	if err := os.Symlink(xmlFile, configName); err != nil {
 		t.Fatalf("Symlink(%s):  %v", xmlFile, err)
 	}

 	if _, err := os.Lstat(wsDir); err != nil {
 		t.Fatalf("Lstat(%s): %v", wsDir, err)
 	}

 	if got, err := os.Readlink(configName); err != nil {
 		t.Fatalf("Readlink(%s): %v", configName, err)
 	} else if want := "../ws/.slothfs/manifest.xml"; got != want {
 		t.Errorf("got link %s, want %s", got, want)
 	}

 	if _, err := manifest.ParseFile(configName); err != nil {
 		t.Fatalf("ParseFile(%s): %v", configName, err)
 	}

 	fn := filepath.Join(wsDir, "build", "kati", "AUTHORS")
 	if fi, err := os.Lstat(fn); err != nil {
 		t.Fatalf("Lstat(%s): %v", fn, err)
 	} else if fi.Size() != 373 {
 		t.Errorf("got %d, want size 373", fi.Size())
 	}

 	if err := os.Remove(configName); err != nil {
 		t.Fatalf("Delete(%s): %v", configName, err)
 	}

 	if fi, err := os.Lstat(wsDir); err == nil {
 		t.Errorf("Lstat(%s): got %v, want error", wsDir, fi)
 	}
 }

 func TestMultiFSManifestDir(t *testing.T) {
 	fix, err := newTestFixture()
 	if err != nil {
 		t.Fatalf("newTestFixture: %v", err)
 	}
 	defer fix.cleanup()

 	mfDir := filepath.Join(fix.dir, "manifests")
 	if err := os.MkdirAll(mfDir, 0755); err != nil {
 		t.Fatalf("MkdirAll: %v", err)
 	}

 	xmlFile := filepath.Join(mfDir, "ws")
 	if err := ioutil.WriteFile(xmlFile, []byte(testManifestXML), 0644); err != nil {
 		t.Errorf("WriteFile(%s): %v", xmlFile, err)
 	}

 	opts := MultiFSOptions{
 		ManifestDir: mfDir,
 	}
 	fs := NewMultiFS(fix.service, fix.cache, opts)

 	if err := fix.mount(fs); err != nil {
 		t.Fatalf("mount: %v", err)
 	}

 	wsDir := filepath.Join(fix.mntDir, "ws")
 	if _, err := os.Lstat(wsDir); err != nil {
 		t.Fatalf("Lstat(%s): %v", wsDir, err)
 	}

 	if err := os.Remove(filepath.Join(fix.mntDir, "config", "ws")); err != nil {
 		t.Fatalf("Remove(config link): %v", err)
 	}

 	if fi, err := os.Lstat(filepath.Join(mfDir, "ws")); err == nil {
 		t.Errorf("'ws' still in manifest dir: %v", fi)
 	}

 	f, err := ioutil.TempFile("", "")
 	if err != nil {
 		t.Fatalf("TempFile: %v", err)
 	}
 	if err := ioutil.WriteFile(f.Name(), []byte(testManifestXML), 0644); err != nil {
 		t.Errorf("WriteFile(%s): %v", xmlFile, err)
 	}

 	configName := filepath.Join(fix.mntDir, "config", "ws2")
 	if err := os.Symlink(f.Name(), configName); err != nil {
 		t.Fatalf("Symlink(%s):  %v", xmlFile, err)
 	}

 	// XML file appears again.
 	xmlFile = filepath.Join(mfDir, "ws2")
 	if _, err := os.Stat(xmlFile); err != nil {
 		t.Errorf("Stat(%s): %v", xmlFile, err)
 	}
 }
	// Copyright 2016 Google Inc. All rights reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	package fs

	import (
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"reflect"
	"sort"
	"syscall"
	"testing"
	"time"

	"github.com/google/slothfs/cache"
	"github.com/google/slothfs/gitiles"
	"github.com/google/slothfs/manifest"
	"github.com/hanwen/go-fuse/fuse"
	"github.com/hanwen/go-fuse/fuse/nodefs"
	)

	func newManifestTestFixture(mf manifest.Manifest) (testFixture, error) {
	fix, err := newTestFixture()
	if err != nil {
	return nil, err
	}

	opts := ManifestOptions{
	Manifest: mf,
	}

	fs, err := NewManifestFS(fix.service, fix.cache, opts)
	if err != nil {
	return nil, err
	}
	if err := fix.mount(fs); err != nil {
	return nil, err
	}

	return fix, nil
	}

	func TestManifestFSCloneOption(t *testing.T) {
	mf := *testManifest
	for i := range mf.Project {
	mf.Project[i].CloneDepth = "1"
	}

	fix, err := newManifestTestFixture(&mf)
	if err != nil {
	t.Fatalf("newManifestTestFixture: %v", err)
	}
	defer fix.cleanup()

	fs := fix.root.(*manifestFSRoot)
	ch := fs.Inode()
	for _, n := range []string{"build", "kati", "AUTHORS"} {
	newCh := ch.GetChild(n)
	if ch == nil {
	t.Fatalf("node for %q not found. Have %s", n, ch.Children())
	}
	ch = newCh
	}

	giNode, ok := ch.Node().(*gitilesNode)
	if !ok {
	t.Fatalf("got node type %T, want *gitilesNode", ch.Node())
	}

	if giNode.clone {
	t.Errorf("file had clone set.")
	}
	}

	func TestManifestFSTimestamps(t *testing.T) {
	fix, err := newManifestTestFixture(testManifest)
	if err != nil {
	t.Fatal("newTestFixture", err)
	}
	defer fix.cleanup()

	var zeroFiles []string
	if err := filepath.Walk(fix.mntDir, func(n string, fi os.FileInfo, err error) error {
	if fi != nil && fi.ModTime().UnixNano() == 0 {
	r, _ := filepath.Rel(fix.mntDir, n)
	zeroFiles = append(zeroFiles, r)
	}
	return nil
	}); err != nil {
	t.Fatalf("Walk: %v", err)
	}
	if len(zeroFiles) > 0 {
	sort.Strings(zeroFiles)
	t.Errorf("found files with zero timestamps: %v", zeroFiles)
	}
	}

	func TestManifestFSBasic(t *testing.T) {
	fix, err := newManifestTestFixture(testManifest)
	if err != nil {
	t.Fatal("newTestFixture", err)
	}
	defer fix.cleanup()

	fn := filepath.Join(fix.mntDir, "build", "kati", "AUTHORS")
	fi, err := os.Lstat(fn)
	if err != nil {
	t.Fatalf("Lstat(%s): %v", fn, err)
	}
	if fi.Size() != 373 {
	t.Errorf("got size %d want %d", fi.Size(), 373)
	}

	contents, err := ioutil.ReadFile(fn)
	if err != nil {
	t.Fatalf("ReadFile(%s): %v", fn, err)
	}

	want := testGitiles["/platform/build/kati/+show/ce34badf691d36e8048b63f89d1a86ee5fa4325c/AUTHORS?format=TEXT"]
	if string(contents) != want {
	t.Fatalf("got %q, want %q", contents, want)
	}

	copyPath := filepath.Join(fix.mntDir, "build", "copydest")
	if copyFI, err := os.Lstat(copyPath); err != nil {
	t.Errorf("Lstat(%s): %v", copyPath, err)
	} else {
	copyStat := copyFI.Sys().(*syscall.Stat_t)
	origStat := fi.Sys().(*syscall.Stat_t)

	if !reflect.DeepEqual(copyStat, origStat) {
	t.Errorf("got stat %v, want %v", copyStat, origStat)
	}
	}

	linkPath := filepath.Join(fix.mntDir, "build", "linkdest")
	if got, err := os.Readlink(linkPath); err != nil {
	t.Errorf("Readlink(%s): %v", linkPath, err)
	} else if want := "kati/AUTHORS"; got != want {
	t.Errorf("Readlink(%s) = %q, want %q", linkPath, got, want)
	}
	}

	func TestManifestFSXMLFile(t *testing.T) {
	fix, err := newManifestTestFixture(testManifest)
	if err != nil {
	t.Fatal("newTestFixture", err)
	}
	defer fix.cleanup()

	xmlPath := filepath.Join(fix.mntDir, ".slothfs", "manifest.xml")
	fuseMF, err := manifest.ParseFile(xmlPath)
	if err != nil {
	t.Fatalf("ParseFile(%s): %v", xmlPath, err)
	}

	if !reflect.DeepEqual(fuseMF, testManifest) {
	t.Errorf("read back manifest %v, want %v", fuseMF, testManifest)
	}
	}

	type testFixture struct {
	dir string
	mntDir string
	server *fuse.Server
	cache *cache.Cache
	testServer *testServer
	service *gitiles.Service
	root nodefs.Node
	}

	func (f *testFixture) cleanup() {
	if f.testServer != nil {
	f.testServer.listener.Close()
	}
	if f.server != nil {
	f.server.Unmount()
	}
	os.RemoveAll(f.dir)
	}

	func newTestFixture() (*testFixture, error) {
	d, err := ioutil.TempDir("", "multifstest")
	if err != nil {
	return nil, err
	}

	fixture := &testFixture{dir: d}

	fixture.cache, err = cache.NewCache(filepath.Join(d, "/cache"), cache.Options{})
	if err != nil {
	return nil, err
	}

	fixture.testServer, err = newTestServer()
	if err != nil {
	return nil, err
	}

	fixture.service, err = gitiles.NewService(gitiles.Options{
	Address: fmt.Sprintf("http://%s", fixture.testServer.addr),
	})
	if err != nil {
	return nil, err
	}

	return fixture, nil
	}

	func (f *testFixture) mount(root nodefs.Node) error {
	f.mntDir = filepath.Join(f.dir, "mnt")
	if err := os.Mkdir(f.mntDir, 0755); err != nil {
	return err
	}

	fuseOpts := &nodefs.Options{
	EntryTimeout: time.Hour,
	NegativeTimeout: time.Hour,
	AttrTimeout: time.Hour,
	}

	var err error
	f.server, _, err = nodefs.MountRoot(f.mntDir, root, fuseOpts)
	if err != nil {
	return err
	}

	if fuseDebug {
	f.server.SetDebug(true)
	}
	go f.server.Serve()

	f.root = root
	return nil
	}

	func TestMultiFSBrokenXML(t *testing.T) {
	fix, err := newTestFixture()
	if err != nil {
	t.Fatalf("newTestFixture: %v", err)
	}
	defer fix.cleanup()

	brokenXMLFile := filepath.Join(fix.dir, "broken.xml")
	if err := ioutil.WriteFile(brokenXMLFile, []byte("I'm not XML."), 0644); err != nil {
	t.Errorf("WriteFile(%s): %v", brokenXMLFile, err)
	}

	opts := MultiFSOptions{}
	fs := NewMultiFS(fix.service, fix.cache, opts)

	if err := fix.mount(fs); err != nil {
	t.Fatalf("mount: %v", err)
	}

	if err := os.Symlink(brokenXMLFile, filepath.Join(fix.mntDir, "config", "ws")); err == nil {
	t.Fatalf("want error for broken XML file")
	}
	}

	func TestMultiFSBasic(t *testing.T) {
	fix, err := newTestFixture()
	if err != nil {
	t.Fatalf("newTestFixture: %v", err)
	}
	defer fix.cleanup()

	xmlFile := filepath.Join(fix.dir, "manifest.xml")
	if err := ioutil.WriteFile(xmlFile, []byte(testManifestXML), 0644); err != nil {
	t.Errorf("WriteFile(%s): %v", xmlFile, err)
	}

	opts := MultiFSOptions{}
	fs := NewMultiFS(fix.service, fix.cache, opts)

	if err := fix.mount(fs); err != nil {
	t.Fatalf("mount: %v", err)
	}

	wsDir := filepath.Join(fix.mntDir, "ws")
	if fi, err := os.Lstat(wsDir); err == nil {
	t.Fatalf("got %v, want non-existent workspace dir", fi)
	}

	configName := filepath.Join(fix.mntDir, "config", "ws")
	if err := os.Symlink(xmlFile, configName); err != nil {
	t.Fatalf("Symlink(%s): %v", xmlFile, err)
	}

	if _, err := os.Lstat(wsDir); err != nil {
	t.Fatalf("Lstat(%s): %v", wsDir, err)
	}

	if got, err := os.Readlink(configName); err != nil {
	t.Fatalf("Readlink(%s): %v", configName, err)
	} else if want := "../ws/.slothfs/manifest.xml"; got != want {
	t.Errorf("got link %s, want %s", got, want)
	}

	if _, err := manifest.ParseFile(configName); err != nil {
	t.Fatalf("ParseFile(%s): %v", configName, err)
	}

	fn := filepath.Join(wsDir, "build", "kati", "AUTHORS")
	if fi, err := os.Lstat(fn); err != nil {
	t.Fatalf("Lstat(%s): %v", fn, err)
	} else if fi.Size() != 373 {
	t.Errorf("got %d, want size 373", fi.Size())
	}

	if err := os.Remove(configName); err != nil {
	t.Fatalf("Delete(%s): %v", configName, err)
	}

	if fi, err := os.Lstat(wsDir); err == nil {
	t.Errorf("Lstat(%s): got %v, want error", wsDir, fi)
	}
	}

	func TestMultiFSManifestDir(t *testing.T) {
	fix, err := newTestFixture()
	if err != nil {
	t.Fatalf("newTestFixture: %v", err)
	}
	defer fix.cleanup()

	mfDir := filepath.Join(fix.dir, "manifests")
	if err := os.MkdirAll(mfDir, 0755); err != nil {
	t.Fatalf("MkdirAll: %v", err)
	}

	xmlFile := filepath.Join(mfDir, "ws")
	if err := ioutil.WriteFile(xmlFile, []byte(testManifestXML), 0644); err != nil {
	t.Errorf("WriteFile(%s): %v", xmlFile, err)
	}

	opts := MultiFSOptions{
	ManifestDir: mfDir,
	}
	fs := NewMultiFS(fix.service, fix.cache, opts)

	if err := fix.mount(fs); err != nil {
	t.Fatalf("mount: %v", err)
	}

	wsDir := filepath.Join(fix.mntDir, "ws")
	if _, err := os.Lstat(wsDir); err != nil {
	t.Fatalf("Lstat(%s): %v", wsDir, err)
	}

	if err := os.Remove(filepath.Join(fix.mntDir, "config", "ws")); err != nil {
	t.Fatalf("Remove(config link): %v", err)
	}

	if fi, err := os.Lstat(filepath.Join(mfDir, "ws")); err == nil {
	t.Errorf("'ws' still in manifest dir: %v", fi)
	}

	f, err := ioutil.TempFile("", "")
	if err != nil {
	t.Fatalf("TempFile: %v", err)
	}
	if err := ioutil.WriteFile(f.Name(), []byte(testManifestXML), 0644); err != nil {
	t.Errorf("WriteFile(%s): %v", xmlFile, err)
	}

	configName := filepath.Join(fix.mntDir, "config", "ws2")
	if err := os.Symlink(f.Name(), configName); err != nil {
	t.Fatalf("Symlink(%s): %v", xmlFile, err)
	}

	// XML file appears again.
	xmlFile = filepath.Join(mfDir, "ws2")
	if _, err := os.Stat(xmlFile); err != nil {
	t.Errorf("Stat(%s): %v", xmlFile, err)
	}
	}