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// Copyright 2016 the Go-FUSE Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Mounts another directory as loopback for testing and benchmarking
// purposes.
package main
import (
"flag"
"fmt"
"log"
"os"
"os/signal"
"path"
"path/filepath"
"runtime/pprof"
"syscall"
"time"
"github.com/hanwen/go-fuse/fuse"
"github.com/hanwen/go-fuse/fuse/nodefs"
"github.com/hanwen/go-fuse/fuse/pathfs"
)
func writeMemProfile(fn string, sigs <-chan os.Signal) {
i := 0
for range sigs {
fn := fmt.Sprintf("%s-%d.memprof", fn, i)
i++
log.Printf("Writing mem profile to %s\n", fn)
f, err := os.Create(fn)
if err != nil {
log.Printf("Create: %v", err)
continue
}
pprof.WriteHeapProfile(f)
if err := f.Close(); err != nil {
log.Printf("close %v", err)
}
}
}
func main() {
log.SetFlags(log.Lmicroseconds)
// Scans the arg list and sets up flags
debug := flag.Bool("debug", false, "print debugging messages.")
other := flag.Bool("allow-other", false, "mount with -o allowother.")
enableLinks := flag.Bool("l", false, "Enable hard link support")
cpuprofile := flag.String("cpuprofile", "", "write cpu profile to this file")
memprofile := flag.String("memprofile", "", "write memory profile to this file")
flag.Parse()
if flag.NArg() < 2 {
fmt.Printf("usage: %s MOUNTPOINT ORIGINAL\n", path.Base(os.Args[0]))
fmt.Printf("\noptions:\n")
flag.PrintDefaults()
os.Exit(2)
}
if *cpuprofile != "" {
fmt.Printf("Writing cpu profile to %s\n", *cpuprofile)
f, err := os.Create(*cpuprofile)
if err != nil {
fmt.Println(err)
os.Exit(3)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
if *memprofile != "" {
log.Printf("send SIGUSR1 to %d to dump memory profile", os.Getpid())
profSig := make(chan os.Signal, 1)
signal.Notify(profSig, syscall.SIGUSR1)
go writeMemProfile(*memprofile, profSig)
}
if *cpuprofile != "" || *memprofile != "" {
fmt.Printf("Note: You must unmount gracefully, otherwise the profile file(s) will stay empty!\n")
}
var finalFs pathfs.FileSystem
orig := flag.Arg(1)
loopbackfs := pathfs.NewLoopbackFileSystem(orig)
finalFs = loopbackfs
opts := &nodefs.Options{
// These options are to be compatible with libfuse defaults,
// making benchmarking easier.
NegativeTimeout: time.Second,
AttrTimeout: time.Second,
EntryTimeout: time.Second,
}
// Enable ClientInodes so hard links work
pathFsOpts := &pathfs.PathNodeFsOptions{ClientInodes: *enableLinks}
pathFs := pathfs.NewPathNodeFs(finalFs, pathFsOpts)
conn := nodefs.NewFileSystemConnector(pathFs.Root(), opts)
mountPoint := flag.Arg(0)
origAbs, _ := filepath.Abs(orig)
mOpts := &fuse.MountOptions{
AllowOther: *other,
Name: "loopbackfs",
FsName: origAbs,
Debug: *debug,
}
state, err := fuse.NewServer(conn.RawFS(), mountPoint, mOpts)
if err != nil {
fmt.Printf("Mount fail: %v\n", err)
os.Exit(1)
}
fmt.Println("Mounted!")
state.Serve()
}
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