Only hash directory part of filename.

unionfs/autounion.go

@@ -93,6 +93,10 @@ func (me *AutoUnionFs) updateKnownFses() {
 
 func (me *AutoUnionFs) Readlink(path string) (out string, code fuse.Status) {
 	comps := strings.Split(path, filepath.SeparatorString, -1)
+	if comps[0] == "status" && comps[1] == "autobase" {
+		return me.root, fuse.OK
+	}
+
 	if comps[0] != "config" {
 		return "", fuse.ENOENT
 	}
@@ -121,6 +125,13 @@ func (me *AutoUnionFs) GetAttr(path string) (*fuse.Attr, fuse.Status) {
 		return a, fuse.OK
 	}
 
+	if path == "status/autobase" {
+		a := &fuse.Attr{
+			Mode: syscall.S_IFLNK | 0644,
+		}
+		return a, fuse.OK
+	}
+
 	comps := strings.Split(path, filepath.SeparatorString, -1)
 
 	me.lock.RLock()
@@ -148,11 +159,16 @@ func (me *AutoUnionFs) GetAttr(path string) (*fuse.Attr, fuse.Status) {
 }
 
 func (me *AutoUnionFs) StatusDir() (stream chan fuse.DirEntry, status fuse.Status) {
-	stream = make(chan fuse.DirEntry, 1)
+	stream = make(chan fuse.DirEntry, 10)
 	stream <- fuse.DirEntry{
 		Name: "gounionfs_version",
 		Mode: fuse.S_IFREG | 0644,
 	}
+	stream <- fuse.DirEntry{
+		Name: "autobase",
+		Mode: syscall.S_IFLNK | 0644,
+	}
+
 	close(stream)
 	return stream, fuse.OK
 }

unionfs/unionfs.go

@@ -16,12 +16,14 @@ import (
 
 // TODO(hanwen): is md5 sufficiently fast?
 func filePathHash(path string) string {
+	dir, base := filepath.Split(path)
+
 	h := md5.New()
-	h.Write([]byte(path))
+	h.Write([]byte(dir))
 
 	// TODO(hanwen): should use a tighter format, so we can pack
 	// more results in a readdir() roundtrip.
-	return fmt.Sprintf("%x", h.Sum())
+	return fmt.Sprintf("%x-%s", h.Sum()[:8], base)
 }
 
 /*