Drop -mem option for unionfs.

example/unionfs/main.go

@@ -11,7 +11,6 @@ import (
 
 func main() {
 	debug := flag.Bool("debug", false, "debug on")
-	mem := flag.Bool("mem", false, "use in-memory unionfs")
 	portable := flag.Bool("portable", false, "use 32 bit inodes")
 
 	entry_ttl := flag.Float64("entry_ttl", 1.0, "fuse entry cache TTL.")
@@ -27,11 +26,6 @@ func main() {
 		os.Exit(2)
 	}
 
-	var nodeFs fuse.NodeFileSystem
-	if *mem {
-		nodeFs = unionfs.NewMemUnionFs(
-			flag.Arg(1)+"/", &fuse.LoopbackFileSystem{Root: flag.Arg(2)})
-	} else {
 	ufsOptions := unionfs.UnionFsOptions{
 		DeletionCacheTTLSecs: *delcache_ttl,
 		BranchCacheTTLSecs:   *branchcache_ttl,
@@ -43,8 +37,7 @@ func main() {
 		log.Fatal("Cannot create UnionFs", err)
 		os.Exit(1)
 	}
-		nodeFs = fuse.NewPathNodeFs(ufs, &fuse.PathNodeFsOptions{ClientInodes: true})
-	}
+	nodeFs := fuse.NewPathNodeFs(ufs, &fuse.PathNodeFsOptions{ClientInodes: true})
 	mOpts := fuse.FileSystemOptions{
 		EntryTimeout:    *entry_ttl,
 		AttrTimeout:     *entry_ttl,