Mounts and show an empty dir

frontend/fs.go

@@ -7,14 +7,20 @@ import (
 
 type FS struct {
 	*cryptfs.FS
+	backing string
 }
 
-func New(key [16]byte) *FS {
+func New(key [16]byte, b string) *FS {
 	return &FS {
 		FS: cryptfs.NewFS(key),
+		backing: b,
 	}
 }
 
 func (fs *FS) Root() (fs.Node, error) {
-	return nil, nil
+	n := Node{
+		backing: "",
+		parentFS: fs,
+	}
+	return n, nil
 }

frontend/node.go

@@ -0,0 +1,79 @@
+package frontend
+
+import (
+	"fmt"
+	"os"
+	"time"
+	"syscall"
+	"io/ioutil"
+	"path"
+
+	"golang.org/x/net/context"
+
+	//"github.com/rfjakob/gocryptfs/cryptfs"
+	"bazil.org/fuse"
+	"bazil.org/fuse/fs"
+)
+
+
+type Node struct {
+	fs.NodeRef
+	backing string
+	parentFS *FS
+}
+
+func StatToAttr(s *syscall.Stat_t, a *fuse.Attr) {
+	a.Inode = s.Ino
+	a.Size = uint64(s.Size)
+	a.Blocks = uint64(s.Blocks)
+	a.Atime = time.Unix(s.Atim.Sec, s.Atim.Nsec)
+	a.Mtime = time.Unix(s.Mtim.Sec, s.Mtim.Nsec)
+	a.Ctime = time.Unix(s.Ctim.Sec, s.Ctim.Nsec)
+	a.Mode = os.FileMode(s.Mode) | os.ModeDir
+	a.Nlink = uint32(s.Nlink)
+	a.Uid = uint32(s.Uid)
+	a.Gid = uint32(s.Gid)
+	a.Rdev = uint32(s.Rdev)
+}
+
+func (n Node) Attr(ctx context.Context, attr *fuse.Attr) error {
+	var err error
+	var st syscall.Stat_t
+	if n.backing == "" {
+		// When GetAttr is called for the toplevel directory, we always want
+		// to look through symlinks.
+		fmt.Printf("Attr %s\n", n.parentFS.backing)
+		//err = syscall.Stat(n.parentFS.backing, &st)
+		err = syscall.Stat("/", &st)
+	} else {
+		fmt.Printf("Attr %s\n", path.Join(n.parentFS.backing, n.backing))
+		p := path.Join(n.parentFS.backing, n.backing)
+		err = syscall.Lstat(p, &st)
+	}
+	if err != nil {
+		return err
+	}
+	StatToAttr(&st, attr)
+	return nil
+}
+
+func (n *Node) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
+	entries, err := ioutil.ReadDir(n.backing)
+	if err != nil {
+		return nil, err
+	}
+	var fuseEntries []fuse.Dirent
+	for _, e := range entries {
+		var d fuse.Dirent
+		d.Name = e.Name()
+		fuseEntries = append(fuseEntries, d)
+	}
+	return fuseEntries, err
+}
+
+func (n *Node) Lookup(ctx context.Context, name string) (fs.Node, error) {
+	if name == "hello" {
+		return Node{}, nil
+	}
+	return nil, fuse.ENOENT
+}

main.go

@@ -18,11 +18,11 @@ import (
 )
 
 // debug flag enables logging of debug messages to stderr.
-var debug = flag.Bool("debug", false, "enable debug log messages to stderr")
+var debug = flag.Bool("debug", true, "enable debug log messages to stderr")
 
 func usage() {
 	fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
-	fmt.Fprintf(os.Stderr, "  %s MOUNTPOINT\n", os.Args[0])
+	fmt.Fprintf(os.Stderr, "  %s BACKING MOUNTPOINT\n", os.Args[0])
 	flag.PrintDefaults()
 }
 
@@ -34,18 +34,19 @@ func main() {
 	flag.Usage = usage
 	flag.Parse()
 
-	if flag.NArg() != 1 {
+	if flag.NArg() != 2 {
 		usage()
 		os.Exit(2)
 	}
 
-	mountpoint := flag.Arg(0)
+	backing := flag.Arg(0)
+	mountpoint := flag.Arg(1)
 	c, err := fuse.Mount(
 		mountpoint,
-		fuse.FSName("memfs"),
-		fuse.Subtype("memfs"),
+		fuse.FSName("gocryptfs"),
+		fuse.Subtype("gocryptfs"),
 		fuse.LocalVolume(),
-		fuse.VolumeName("Memory FS"),
+		fuse.VolumeName("gocryptfs"),
 	)
 	if err != nil {
 		log.Fatal(err)
@@ -59,7 +60,7 @@ func main() {
 
 	srv := fs.New(c, cfg)
 	var key [16]byte
-	filesys := frontend.New(key)
+	filesys := frontend.New(key, backing)
 
 	if err := srv.Serve(filesys); err != nil {
 		log.Fatal(err)