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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// appmount mounts an appfs file system.
package main
import (
"bytes"
"encoding/gob"
"flag"
"fmt"
"log"
"os"
"os/exec"
"path"
"strings"
"syscall"
"time"
"sync"
"runtime"
"github.com/mattermost/rsc/appfs/client"
"github.com/mattermost/rsc/appfs/proto"
"github.com/mattermost/rsc/fuse"
"github.com/mattermost/rsc/keychain"
)
var usageMessage = `usage: appmount [-h host] [-u user] [-p password] /mnt
Appmount mounts the appfs file system on the named mount point.
The default host is localhost:8080.
`
// Shared between master and slave.
var z struct {
Client client.Client
Debug *bool
Mtpt string
}
var fc *fuse.Conn
var cl = &z.Client
func init() {
flag.StringVar(&cl.Host, "h", "localhost:8080", "app serving host")
flag.StringVar(&cl.User, "u", "", "user name")
flag.StringVar(&cl.Password, "p", "", "password")
z.Debug = flag.Bool("debug", false, "")
}
func usage() {
fmt.Fprint(os.Stderr, usageMessage)
os.Exit(2)
}
func main() {
log.SetFlags(0)
if len(os.Args) == 2 && os.Args[1] == "MOUNTSLAVE" {
mountslave()
return
}
flag.Usage = usage
flag.Parse()
args := flag.Args()
if len(args) == 0 {
usage()
}
z.Mtpt = args[0]
if cl.Password == "" {
var err error
cl.User, cl.Password, err = keychain.UserPasswd(cl.Host, "")
if err != nil {
fmt.Fprintf(os.Stderr, "unable to obtain user and password: %s\n", err)
os.Exit(2)
}
}
if _, err := cl.Stat("/"); err != nil {
log.Fatal(err)
}
// Run in child so that we can exit once child is running.
r, w, err := os.Pipe()
if err != nil {
log.Fatal(err)
}
var buf bytes.Buffer
enc := gob.NewEncoder(&buf)
enc.Encode(&z)
cmd := exec.Command(os.Args[0], "MOUNTSLAVE")
cmd.Stdin = &buf
cmd.Stdout = w
cmd.Stderr = os.Stderr
if err := cmd.Start(); err != nil {
log.Fatalf("mount process: %v", err)
}
w.Close()
ok := make([]byte, 10)
n, _ := r.Read(ok)
if n != 2 || string(ok[0:2]) != "OK" {
os.Exit(1)
}
fmt.Fprintf(os.Stderr, "mounted on %s\n", z.Mtpt)
}
func mountslave() {
stdout, _ := syscall.Dup(1)
syscall.Dup2(2, 1)
r := gob.NewDecoder(os.Stdin)
if err := r.Decode(&z); err != nil {
log.Fatalf("gob decode: %v", err)
}
fc, err := fuse.Mount(z.Mtpt)
if err != nil {
log.Fatal(err)
}
defer exec.Command("umount", z.Mtpt).Run()
if *z.Debug {
fuse.Debugf = log.Printf
}
syscall.Write(stdout, []byte("OK"))
syscall.Close(stdout)
fc.Serve(FS{})
}
type FS struct{}
func (FS) Root() (fuse.Node, fuse.Error) {
return file("/")
}
type File struct {
Name string
FileInfo *proto.FileInfo
Data []byte
}
type statEntry struct {
fi *proto.FileInfo
err error
t time.Time
}
var statCache struct {
mu sync.Mutex
m map[string] statEntry
}
func stat(name string) (*proto.FileInfo, error) {
if runtime.GOOS == "darwin" && strings.Contains(name, "/._") {
// Mac resource forks
return nil, fmt.Errorf("file not found")
}
statCache.mu.Lock()
e, ok := statCache.m[name]
statCache.mu.Unlock()
if ok && time.Since(e.t) < 2*time.Minute {
return e.fi, e.err
}
fi, err := cl.Stat(name)
saveStat(name, fi, err)
return fi, err
}
func saveStat(name string, fi *proto.FileInfo, err error) {
if *z.Debug {
if fi != nil {
fmt.Fprintf(os.Stderr, "savestat %s %+v\n", name, *fi)
} else {
fmt.Fprintf(os.Stderr, "savestat %s %v\n", name, err)
}
}
statCache.mu.Lock()
if statCache.m == nil {
statCache.m = make(map[string]statEntry)
}
statCache.m[name] = statEntry{fi, err, time.Now()}
statCache.mu.Unlock()
}
func delStat(name string) {
statCache.mu.Lock()
if statCache.m != nil {
delete(statCache.m, name)
}
statCache.mu.Unlock()
}
func file(name string) (fuse.Node, fuse.Error) {
fi, err := stat(name)
if err != nil {
if strings.Contains(err.Error(), "no such entity") {
return nil, fuse.ENOENT
}
if *z.Debug {
log.Printf("stat %s: %v", name, err)
}
return nil, fuse.EIO
}
return &File{name, fi, nil}, nil
}
func (f *File) Attr() (attr fuse.Attr) {
fi := f.FileInfo
attr.Mode = 0666
if fi.IsDir {
attr.Mode |= 0111 | os.ModeDir
}
attr.Mtime = fi.ModTime
attr.Size = uint64(fi.Size)
return
}
func (f *File) Lookup(name string, intr fuse.Intr) (fuse.Node, fuse.Error) {
return file(path.Join(f.Name, name))
}
func (f *File) ReadAll(intr fuse.Intr) ([]byte, fuse.Error) {
data, err := cl.Read(f.Name)
if err != nil {
log.Printf("read %s: %v", f.Name, err)
return nil, fuse.EIO
}
return data, nil
}
func (f *File) ReadDir(intr fuse.Intr) ([]fuse.Dirent, fuse.Error) {
fis, err := cl.ReadDir(f.Name)
if err != nil {
log.Printf("read %s: %v", f.Name, err)
return nil, fuse.EIO
}
var dirs []fuse.Dirent
for _, fi := range fis {
saveStat(path.Join(f.Name, fi.Name), fi, nil)
dirs = append(dirs, fuse.Dirent{Name: fi.Name})
}
return dirs, nil
}
func (f *File) WriteAll(data []byte, intr fuse.Intr) fuse.Error {
defer delStat(f.Name)
if err := cl.Write(f.Name[1:], data); err != nil {
log.Printf("write %s: %v", f.Name, err)
return fuse.EIO
}
return nil
}
func (f *File) Mkdir(req *fuse.MkdirRequest, intr fuse.Intr) (fuse.Node, fuse.Error) {
defer delStat(f.Name)
p := path.Join(f.Name, req.Name)
if err := cl.Create(p[1:], true); err != nil {
log.Printf("mkdir %s: %v", p, err)
return nil, fuse.EIO
}
delStat(p)
return file(p)
}
func (f *File) Create(req *fuse.CreateRequest, resp *fuse.CreateResponse, intr fuse.Intr) (fuse.Node, fuse.Handle, fuse.Error) {
defer delStat(f.Name)
p := path.Join(f.Name, req.Name)
if err := cl.Create(p[1:], false); err != nil {
log.Printf("create %s: %v", p, err)
return nil, nil, fuse.EIO
}
delStat(p)
n, err := file(p)
if err != nil {
return nil, nil, err
}
return n, n, nil
}
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