Add -mem flag to unionfs example.

example/unionfs/main.go

@@ -11,29 +11,36 @@ import (
 
 func main() {
 	debug := flag.Bool("debug", false, "debug on")
+	mem := flag.Bool("mem", false, "use in-memory unionfs")
 	delcache_ttl := flag.Float64("deletion_cache_ttl", 5.0, "Deletion cache TTL in seconds.")
 	branchcache_ttl := flag.Float64("branchcache_ttl", 5.0, "Branch cache TTL in seconds.")
 	deldirname := flag.String(
 		"deletion_dirname", "GOUNIONFS_DELETIONS", "Directory name to use for deletions.")
 	flag.Parse()
-
 	if len(flag.Args()) < 2 {
-		fmt.Println("Usage:\n  main MOUNTPOINT RW-DIRECTORY RO-DIRECTORY ...")
+		fmt.Println("Usage:\n  unionfs MOUNTPOINT RW-DIRECTORY RO-DIRECTORY ...")
 		os.Exit(2)
 	}
 
-	ufsOptions := unionfs.UnionFsOptions{
-		DeletionCacheTTLSecs: *delcache_ttl,
-		BranchCacheTTLSecs:   *branchcache_ttl,
-		DeletionDirName:      *deldirname,
-	}
+	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,
+			DeletionDirName:      *deldirname,
+		}
 
-	ufs, err := unionfs.NewUnionFsFromRoots(flag.Args()[1:], &ufsOptions, true)
-	if err != nil {
-		log.Fatal("Cannot create UnionFs", err)
-		os.Exit(1)
+		ufs, err := unionfs.NewUnionFsFromRoots(flag.Args()[1:], &ufsOptions, true)
+		if err != nil {
+			log.Fatal("Cannot create UnionFs", err)
+			os.Exit(1)
+		}
+		nodeFs = fuse.NewPathNodeFs(ufs, &fuse.PathNodeFsOptions{ClientInodes: true})
 	}
-	mountState, _, err := fuse.MountPathFileSystem(flag.Arg(0), ufs, nil)
+	mountState, _, err := fuse.MountNodeFileSystem(flag.Arg(0), nodeFs, nil)
 	if err != nil {
 		log.Fatal("Mount fail:", err)
 	}