Add memfs example binary.

example/memfs/Makefile

+# Use "gomake install" to build and install this package.
+include $(GOROOT)/src/Make.inc
+
+TARG=memfs
+GOFILES=main.go
+
+DEPS=../../fuse
+
+include $(GOROOT)/src/Make.cmd
+

example/memfs/main.go

+// Mounts MemNodeFs for testing purposes.
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"github.com/hanwen/go-fuse/fuse"
+	"log"
+	"os"
+	"runtime"
+)
+
+var _ = runtime.GOMAXPROCS
+var _ = log.Print
+
+func main() {
+	// Scans the arg list and sets up flags
+	debug := flag.Bool("debug", false, "print debugging messages.")
+	flag.Parse()
+	if flag.NArg() < 2 {
+		// TODO - where to get program name?
+		fmt.Println("usage: main MOUNTPOINT BACKING-PREFIX")
+		os.Exit(2)
+	}
+
+	mountPoint := flag.Arg(0)
+	prefix := flag.Arg(1)
+	fs := fuse.NewMemNodeFs(prefix)
+	conn := fuse.NewFileSystemConnector(fs, nil)
+	state := fuse.NewMountState(conn)
+	state.Debug = *debug
+
+	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()
+}