Golang fuse.NewLoopbackFileSystem函数代码示例

func setupUfs(t *testing.T) (workdir string, cleanup func()) {
	wd := fuse.MakeTempDir()
	err := os.Mkdir(wd+"/mount", 0700)
	fuse.CheckSuccess(err)

	err = os.Mkdir(wd+"/rw", 0700)
	fuse.CheckSuccess(err)

	os.Mkdir(wd+"/ro", 0700)
	fuse.CheckSuccess(err)

	var fses []fuse.FileSystem
	fses = append(fses, fuse.NewLoopbackFileSystem(wd+"/rw"))
	fses = append(fses,
		NewCachingFileSystem(fuse.NewLoopbackFileSystem(wd+"/ro"), 0))
	ufs := NewUnionFs(fses, testOpts)

	// We configure timeouts are smaller, so we can check for
	// UnionFs's cache consistency.
	opts := &fuse.FileSystemOptions{
		EntryTimeout:    .5 * entryTtl,
		AttrTimeout:     .5 * entryTtl,
		NegativeTimeout: .5 * entryTtl,
	}

	state, _, err := fuse.MountFileSystem(wd+"/mount", ufs, opts)
	CheckSuccess(err)
	state.Debug = true
	go state.Loop(false)

	return wd, func() {
		state.Unmount()
		os.RemoveAll(wd)
	}
}

func setupUfs(t *testing.T) (workdir string, cleanup func()) {
	wd := fuse.MakeTempDir()
	err := os.Mkdir(wd+"/mount", 0700)
	fuse.CheckSuccess(err)

	err = os.Mkdir(wd+"/rw", 0700)
	fuse.CheckSuccess(err)

	os.Mkdir(wd+"/ro", 0700)
	fuse.CheckSuccess(err)

	var fses []fuse.FileSystem
	fses = append(fses, fuse.NewLoopbackFileSystem(wd+"/rw"))
	fses = append(fses, fuse.NewLoopbackFileSystem(wd+"/ro"))
	ufs := NewUnionFs("testFs", fses, testOpts)

	opts := &fuse.FileSystemOptions{
		EntryTimeout:    entryTtl,
		AttrTimeout:     entryTtl,
		NegativeTimeout: entryTtl,
	}

	state, _, err := fuse.MountFileSystem(wd+"/mount", ufs, opts)
	CheckSuccess(err)
	state.Debug = true
	go state.Loop(false)

	return wd, func() {
		state.Unmount()
		os.RemoveAll(wd)
	}
}

// Creates 3 directories on a temporary dir: /mnt with the overlayed
// (unionfs) mount, rw with modifiable data, and ro on the bottom.
func setupUfs(t *testing.T) (workdir string, cleanup func()) {
	// Make sure system setting does not affect test.
	syscall.Umask(0)

	wd, _ := ioutil.TempDir("", "unionfs")
	err := os.Mkdir(wd+"/mnt", 0700)
	if err != nil {
		t.Fatalf("Mkdir failed: %v", err)
	}

	err = os.Mkdir(wd+"/rw", 0700)
	if err != nil {
		t.Fatalf("Mkdir failed: %v", err)
	}

	os.Mkdir(wd+"/ro", 0700)
	if err != nil {
		t.Fatalf("Mkdir failed: %v", err)
	}

	var fses []fuse.FileSystem
	fses = append(fses, fuse.NewLoopbackFileSystem(wd+"/rw"))
	fses = append(fses,
		NewCachingFileSystem(fuse.NewLoopbackFileSystem(wd+"/ro"), 0))
	ufs := NewUnionFs(fses, testOpts)

	// We configure timeouts are smaller, so we can check for
	// UnionFs's cache consistency.
	opts := &fuse.FileSystemOptions{
		EntryTimeout:    entryTtl / 2,
		AttrTimeout:     entryTtl / 2,
		NegativeTimeout: entryTtl / 2,
	}

	pathfs := fuse.NewPathNodeFs(ufs,
		&fuse.PathNodeFsOptions{ClientInodes: true})
	state, conn, err := fuse.MountNodeFileSystem(wd+"/mnt", pathfs, opts)
	if err != nil {
		t.Fatalf("MountNodeFileSystem failed: %v", err)
	}
	conn.Debug = fuse.VerboseTest()
	state.Debug = fuse.VerboseTest()
	go state.Loop()

	return wd, func() {
		err := state.Unmount()
		if err != nil {
			return
		}
		setRecursiveWritable(t, wd, true)
		os.RemoveAll(wd)
	}
}

func NewUnionFsFromRoots(roots []string, opts *UnionFsOptions, roCaching bool) (*UnionFs, os.Error) {
	fses := make([]fuse.FileSystem, 0)
	for i, r := range roots {
		var fs fuse.FileSystem
		fi, err := os.Stat(r)
		if err != nil {
			return nil, err
		}
		if fi.IsDirectory() {
			fs = fuse.NewLoopbackFileSystem(r)
		}
		if fs == nil {
			fs, err = zipfs.NewArchiveFileSystem(r)
		}
		if fs == nil {
			return nil, err

		}
		if i > 0 && roCaching {
			fs = NewCachingFileSystem(fs, 0)
		}

		fses = append(fses, fs)
	}

	return NewUnionFs(fses, *opts), nil
}

func (me *WorkerDaemon) newWorkerTask(req *WorkRequest, rep *WorkReply) (*WorkerTask, os.Error) {
	fs, err := me.getFileServer(req.FileServer)
	if err != nil {
		return nil, err
	}

	w := &WorkerTask{
		WorkRequest: req,
		WorkReply:   rep,
		daemon:      me,
	}

	tmpDir, err := ioutil.TempDir("", "rpcfs-tmp")
	type dirInit struct {
		dst *string
		val string
	}

	for _, v := range []dirInit{
		dirInit{&w.rwDir, "rw"},
		dirInit{&w.mount, "mnt"},
	} {
		*v.dst = filepath.Join(tmpDir, v.val)
		err = os.Mkdir(*v.dst, 0700)
		if err != nil {
			return nil, err
		}
	}

	rwFs := fuse.NewLoopbackFileSystem(w.rwDir)
	roFs := NewRpcFs(fs, me.contentCache)

	// High ttl, since all writes come through fuse.
	ttl := 100.0
	opts := unionfs.UnionFsOptions{
		BranchCacheTTLSecs:   ttl,
		DeletionCacheTTLSecs: ttl,
		DeletionDirName:      _DELETIONS,
	}
	mOpts := fuse.FileSystemOptions{
		EntryTimeout:    ttl,
		AttrTimeout:     ttl,
		NegativeTimeout: ttl,
	}

	ufs := unionfs.NewUnionFs("ufs", []fuse.FileSystem{rwFs, roFs}, opts)
	conn := fuse.NewFileSystemConnector(ufs, &mOpts)
	state := fuse.NewMountState(conn)
	state.Mount(w.mount, &fuse.MountOptions{AllowOther: true})
	if err != nil {
		return nil, err
	}

	w.MountState = state
	go state.Loop(true)
	return w, nil
}

func setupUfs(t *testing.T) (workdir string, cleanup func()) {
	// Make sure system setting does not affect test.
	syscall.Umask(0)

	wd, _ := ioutil.TempDir("", "")
	err := os.Mkdir(wd+"/mnt", 0700)
	fuse.CheckSuccess(err)

	err = os.Mkdir(wd+"/rw", 0700)
	fuse.CheckSuccess(err)

	os.Mkdir(wd+"/ro", 0700)
	fuse.CheckSuccess(err)

	var fses []fuse.FileSystem
	fses = append(fses, fuse.NewLoopbackFileSystem(wd+"/rw"))
	fses = append(fses,
		NewCachingFileSystem(fuse.NewLoopbackFileSystem(wd+"/ro"), 0))
	ufs := NewUnionFs(fses, testOpts)

	// We configure timeouts are smaller, so we can check for
	// UnionFs's cache consistency.
	opts := &fuse.FileSystemOptions{
		EntryTimeout:    .5 * entryTtl,
		AttrTimeout:     .5 * entryTtl,
		NegativeTimeout: .5 * entryTtl,
	}

	pathfs := fuse.NewPathNodeFs(ufs,
		&fuse.PathNodeFsOptions{ClientInodes: true})
	state, conn, err := fuse.MountNodeFileSystem(wd+"/mnt", pathfs, opts)
	CheckSuccess(err)
	conn.Debug = fuse.VerboseTest()
	state.Debug = fuse.VerboseTest()
	go state.Loop()

	return wd, func() {
		state.Unmount()
		os.RemoveAll(wd)
	}
}

func NewProcFs() *ProcFs {
	return &ProcFs{
		LoopbackFileSystem: fuse.NewLoopbackFileSystem("/proc"),
		StripPrefix:        "/",
		AllowedRootFiles: map[string]int{
			"meminfo":     1,
			"cpuinfo":     1,
			"iomem":       1,
			"ioport":      1,
			"loadavg":     1,
			"stat":        1,
			"self":        1,
			"filesystems": 1,
			"mounts":      1,
		},
	}
}

func TestCachingFs(t *testing.T) {
	wd := fuse.MakeTempDir()
	defer os.RemoveAll(wd)

	fs := fuse.NewLoopbackFileSystem(wd)
	cfs := NewCachingFileSystem(fs, 0)

	os.Mkdir(wd+"/orig", 0755)
	fi, code := cfs.GetAttr("orig", nil)
	if !code.Ok() {
		t.Fatal("GetAttr failure", code)
	}
	if !fi.IsDirectory() {
		t.Error("unexpected attr", fi)
	}

	os.Symlink("orig", wd+"/symlink")

	val, code := cfs.Readlink("symlink", nil)
	if val != "orig" {
		t.Error("unexpected readlink", val)
	}
	if !code.Ok() {
		t.Error("code !ok ", code)
	}

	stream, code := cfs.OpenDir("", nil)
	if !code.Ok() {
		t.Fatal("Readdir fail", code)
	}

	results := make(map[string]uint32)
	for v := range stream {
		results[v.Name] = v.Mode &^ 07777
	}
	expected := map[string]uint32{
		"symlink": syscall.S_IFLNK,
		"orig":    fuse.S_IFDIR,
	}
	if !modeMapEq(results, expected) {
		t.Error("Unexpected readdir result", results, expected)
	}
}

func main() {
	// Scans the arg list and sets up flags
	debug := flag.Bool("debug", false, "print debugging messages.")
	other := flag.Bool("allow-other", false, "mount with -o allowother.")
	flag.Parse()
	if flag.NArg() < 2 {
		// TODO - where to get program name?
		fmt.Println("usage: main MOUNTPOINT ORIGINAL")
		os.Exit(2)
	}

	var finalFs fuse.FileSystem
	orig := flag.Arg(1)
	loopbackfs := fuse.NewLoopbackFileSystem(orig)
	finalFs = loopbackfs

	opts := &fuse.FileSystemOptions{
		// These options are to be compatible with libfuse defaults,
		// making benchmarking easier.
		NegativeTimeout: time.Second,
		AttrTimeout:     time.Second,
		EntryTimeout:    time.Second,
	}
	pathFs := fuse.NewPathNodeFs(finalFs, nil)
	conn := fuse.NewFileSystemConnector(pathFs, opts)
	state := fuse.NewMountState(conn)
	state.Debug = *debug

	mountPoint := flag.Arg(0)

	fmt.Println("Mounting")
	mOpts := &fuse.MountOptions{
		AllowOther: *other,
	}
	err := state.Mount(mountPoint, mOpts)
	if err != nil {
		fmt.Printf("Mount fail: %v\n", err)
		os.Exit(1)
	}

	fmt.Println("Mounted!")
	state.Loop()
}

func setupMemUfs(t *testing.T) (workdir string, ufs *MemUnionFs, cleanup func()) {
	// Make sure system setting does not affect test.
	syscall.Umask(0)

	wd, _ := ioutil.TempDir("", "")
	err := os.Mkdir(wd+"/mnt", 0700)
	fuse.CheckSuccess(err)

	err = os.Mkdir(wd+"/backing", 0700)
	fuse.CheckSuccess(err)

	os.Mkdir(wd+"/ro", 0700)
	fuse.CheckSuccess(err)

	roFs := fuse.NewLoopbackFileSystem(wd + "/ro")
	memFs := NewMemUnionFs(wd+"/backing", roFs)

	// We configure timeouts are smaller, so we can check for
	// UnionFs's cache consistency.
	opts := &fuse.FileSystemOptions{
		EntryTimeout:    entryTtl / 2,
		AttrTimeout:     entryTtl / 2,
		NegativeTimeout: entryTtl / 2,
		PortableInodes:  true,
	}

	state, conn, err := fuse.MountNodeFileSystem(wd+"/mnt", memFs, opts)
	CheckSuccess(err)
	conn.Debug = fuse.VerboseTest()
	state.Debug = fuse.VerboseTest()
	go state.Loop()

	return wd, memFs, func() {
		state.Unmount()
		os.RemoveAll(wd)
	}
}

func NewUnionFsFromRoots(roots []string, opts *UnionFsOptions) (*UnionFs, os.Error) {
	fses := make([]fuse.FileSystem, 0)
	for _, r := range roots {
		var fs fuse.FileSystem
		fi, err := os.Stat(r)
		if err != nil {
			return nil, err
		}
		if fi.IsDirectory() {
			fs = fuse.NewLoopbackFileSystem(r)
		}
		if fs == nil {
			fs, err = zipfs.NewArchiveFileSystem(r)
		}
		if fs == nil {
			return nil, err
		}

		fses = append(fses, fs)
	}

	identifier := fmt.Sprintf("%v", roots)
	return NewUnionFs(identifier, fses, *opts), nil
}

func TestUnionFsDisappearing(t *testing.T) {
	// This init is like setupUfs, but we want access to the
	// writable Fs.
	wd, _ := ioutil.TempDir("", "")
	defer os.RemoveAll(wd)
	err := os.Mkdir(wd+"/mnt", 0700)
	fuse.CheckSuccess(err)

	err = os.Mkdir(wd+"/rw", 0700)
	fuse.CheckSuccess(err)

	os.Mkdir(wd+"/ro", 0700)
	fuse.CheckSuccess(err)

	wrFs := fuse.NewLoopbackFileSystem(wd + "/rw")
	var fses []fuse.FileSystem
	fses = append(fses, wrFs)
	fses = append(fses, fuse.NewLoopbackFileSystem(wd+"/ro"))
	ufs := NewUnionFs(fses, testOpts)

	opts := &fuse.FileSystemOptions{
		EntryTimeout:    entryTtl,
		AttrTimeout:     entryTtl,
		NegativeTimeout: entryTtl,
	}

	nfs := fuse.NewPathNodeFs(ufs, nil)
	state, _, err := fuse.MountNodeFileSystem(wd+"/mnt", nfs, opts)
	CheckSuccess(err)
	defer state.Unmount()
	state.Debug = fuse.VerboseTest()
	go state.Loop()

	log.Println("TestUnionFsDisappearing2")

	err = ioutil.WriteFile(wd+"/ro/file", []byte("blabla"), 0644)
	CheckSuccess(err)
	freezeRo(wd + "/ro")

	err = os.Remove(wd + "/mnt/file")
	CheckSuccess(err)

	oldRoot := wrFs.Root
	wrFs.Root = "/dev/null"
	time.Sleep(1.5 * entryTtl * 1e9)

	_, err = ioutil.ReadDir(wd + "/mnt")
	if err == nil {
		t.Fatal("Readdir should have failed")
	}
	log.Println("expected readdir failure:", err)

	err = ioutil.WriteFile(wd+"/mnt/file2", []byte("blabla"), 0644)
	if err == nil {
		t.Fatal("write should have failed")
	}
	log.Println("expected write failure:", err)

	// Restore, and wait for caches to catch up.
	wrFs.Root = oldRoot
	time.Sleep(1.5 * entryTtl * 1e9)

	_, err = ioutil.ReadDir(wd + "/mnt")
	if err != nil {
		t.Fatal("Readdir should succeed", err)
	}
	err = ioutil.WriteFile(wd+"/mnt/file2", []byte("blabla"), 0644)
	if err != nil {
		t.Fatal("write should succeed", err)
	}
}

func newWorkerFuseFs(tmpDir string, rpcFs fuse.FileSystem, writableRoot string, nobody *User) (*workerFuseFs, error) {
	tmpDir, err := ioutil.TempDir(tmpDir, "termite-task")
	if err != nil {
		return nil, err
	}
	me := &workerFuseFs{
		tmpDir:       tmpDir,
		writableRoot: strings.TrimLeft(writableRoot, "/"),
		tasks:        map[*WorkerTask]bool{},
	}

	type dirInit struct {
		dst *string
		val string
	}

	tmpBacking := ""
	for _, v := range []dirInit{
		{&me.rwDir, "rw"},
		{&me.mount, "mnt"},
		{&tmpBacking, "tmp-backing"},
	} {
		*v.dst = filepath.Join(me.tmpDir, v.val)
		err = os.Mkdir(*v.dst, 0700)
		if err != nil {
			return nil, err
		}
	}

	fuseOpts := fuse.MountOptions{}
	if os.Geteuid() == 0 {
		fuseOpts.AllowOther = true
	}

	me.rpcNodeFs = fuse.NewPathNodeFs(rpcFs, nil)
	ttl := 30 * time.Second
	mOpts := fuse.FileSystemOptions{
		EntryTimeout:    ttl,
		AttrTimeout:     ttl,
		NegativeTimeout: ttl,

		// 32-bit programs have trouble with 64-bit inode
		// numbers.
		PortableInodes: true,
	}

	me.fsConnector = fuse.NewFileSystemConnector(me.rpcNodeFs, &mOpts)
	me.MountState = fuse.NewMountState(me.fsConnector)
	err = me.MountState.Mount(me.mount, &fuseOpts)
	if err != nil {
		return nil, err
	}
	go me.MountState.Loop()

	me.unionFs = fs.NewMemUnionFs(
		me.rwDir, &fuse.PrefixFileSystem{rpcFs, me.writableRoot})

	me.procFs = fs.NewProcFs()
	me.procFs.StripPrefix = me.mount
	if nobody != nil {
		me.procFs.Uid = nobody.Uid
	}
	type submount struct {
		mountpoint string
		fs         fuse.NodeFileSystem
	}

	mounts := []submount{
		{"proc", fuse.NewPathNodeFs(me.procFs, nil)},
		{"sys", fuse.NewPathNodeFs(&fuse.ReadonlyFileSystem{fuse.NewLoopbackFileSystem("/sys")}, nil)},
		{"tmp", fuse.NewMemNodeFs(tmpBacking + "/tmp")},
		{"dev", fs.NewDevNullFs()},
		{"var/tmp", fuse.NewMemNodeFs(tmpBacking + "/vartmp")},
	}
	for _, s := range mounts {
		subOpts := &mOpts
		if s.mountpoint == "proc" {
			subOpts = nil
		}

		code := me.rpcNodeFs.Mount(s.mountpoint, s.fs, subOpts)
		if !code.Ok() {
			if err := me.MountState.Unmount(); err != nil {
				log.Fatal("FUSE unmount error during cleanup:", err)
			}
			return nil, errors.New(fmt.Sprintf("submount error for %s: %v", s.mountpoint, code))
		}
	}
	if strings.HasPrefix(me.writableRoot, "tmp/") {
		parent, _ := filepath.Split(me.writableRoot)
		err := os.MkdirAll(filepath.Join(me.mount, parent), 0755)
		if err != nil {
			if err := me.MountState.Unmount(); err != nil {
				log.Fatal("FUSE unmount error during cleanup:", err)
			}
			return nil, errors.New(fmt.Sprintf("Mkdir of %q in /tmp fail: %v", parent, err))
		}
		// This is hackish, but we don't want rpcfs/fsserver
		// getting confused by asking for tmp/foo/bar
		// directly.
//.........这里部分代码省略.........

func main() {
	// Scans the arg list and sets up flags
	debug := flag.Bool("debug", false, "print debugging messages.")
	latencies := flag.Bool("latencies", false, "record latencies.")
	threaded := flag.Bool("threaded", true, "switch off threading; print debugging messages.")
	flag.Parse()
	if flag.NArg() < 2 {
		// TODO - where to get program name?
		fmt.Println("usage: main MOUNTPOINT ORIGINAL")
		os.Exit(2)
	}

	var finalFs fuse.FileSystem
	orig := flag.Arg(1)
	loopbackfs := fuse.NewLoopbackFileSystem(orig)
	finalFs = loopbackfs

	debugFs := fuse.NewFileSystemDebug()
	if *latencies {
		timing := fuse.NewTimingFileSystem(finalFs)
		debugFs.AddTimingFileSystem(timing)
		finalFs = timing
	}

	opts := &fuse.FileSystemOptions{
		// These options are to be compatible with libfuse defaults,
		// making benchmarking easier.
		NegativeTimeout: 1.0,
		AttrTimeout:     1.0,
		EntryTimeout:    1.0,
	}

	if *latencies {
		debugFs.FileSystem = finalFs
		finalFs = debugFs
	}

	conn := fuse.NewFileSystemConnector(finalFs, opts)
	var finalRawFs fuse.RawFileSystem = conn
	if *latencies {
		rawTiming := fuse.NewTimingRawFileSystem(conn)
		debugFs.AddRawTimingFileSystem(rawTiming)
		finalRawFs = rawTiming
	}

	state := fuse.NewMountState(finalRawFs)
	state.Debug = *debug

	if *latencies {
		state.SetRecordStatistics(true)
		debugFs.AddMountState(state)
		debugFs.AddFileSystemConnector(conn)
	}
	mountPoint := flag.Arg(0)

	fmt.Println("Mounting")
	err := state.Mount(mountPoint, nil)
	if err != nil {
		fmt.Printf("Mount fail: %v\n", err)
		os.Exit(1)
	}

	fmt.Println("Mounted!")
	state.Loop(*threaded)
}