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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.
package pathfs
import (
"io"
"log"
"os"
"path/filepath"
"syscall"
"github.com/hanwen/go-fuse/v2/fuse"
"github.com/hanwen/go-fuse/v2/fuse/nodefs"
"github.com/hanwen/go-fuse/v2/internal"
)
type loopbackFileSystem struct {
// TODO - this should need default fill in.
FileSystem
Root string
}
// A FUSE filesystem that shunts all request to an underlying file
// system. Its main purpose is to provide test coverage without
// having to build a synthetic filesystem.
func NewLoopbackFileSystem(root string) FileSystem {
// Make sure the Root path is absolute to avoid problems when the
// application changes working directory.
root, err := filepath.Abs(root)
if err != nil {
panic(err)
}
return &loopbackFileSystem{
FileSystem: NewDefaultFileSystem(),
Root: root,
}
}
func (fs *loopbackFileSystem) StatFs(name string) *fuse.StatfsOut {
s := syscall.Statfs_t{}
err := syscall.Statfs(fs.GetPath(name), &s)
if err == nil {
out := &fuse.StatfsOut{}
out.FromStatfsT(&s)
return out
}
return nil
}
func (fs *loopbackFileSystem) OnMount(nodeFs *PathNodeFs) {
}
func (fs *loopbackFileSystem) OnUnmount() {}
func (fs *loopbackFileSystem) GetPath(relPath string) string {
return filepath.Join(fs.Root, relPath)
}
func (fs *loopbackFileSystem) GetAttr(name string, context *fuse.Context) (a *fuse.Attr, code fuse.Status) {
fullPath := fs.GetPath(name)
var err error = nil
st := syscall.Stat_t{}
if name == "" {
// When GetAttr is called for the toplevel directory, we always want
// to look through symlinks.
err = syscall.Stat(fullPath, &st)
} else {
err = syscall.Lstat(fullPath, &st)
}
if err != nil {
return nil, fuse.ToStatus(err)
}
a = &fuse.Attr{}
a.FromStat(&st)
return a, fuse.OK
}
func (fs *loopbackFileSystem) OpenDir(name string, context *fuse.Context) (stream []fuse.DirEntry, status fuse.Status) {
// What other ways beyond O_RDONLY are there to open
// directories?
f, err := os.Open(fs.GetPath(name))
if err != nil {
return nil, fuse.ToStatus(err)
}
want := 500
output := make([]fuse.DirEntry, 0, want)
for {
infos, err := f.Readdir(want)
for i := range infos {
// workaround for https://code.google.com/p/go/issues/detail?id=5960
if infos[i] == nil {
continue
}
n := infos[i].Name()
d := fuse.DirEntry{
Name: n,
}
if s := fuse.ToStatT(infos[i]); s != nil {
d.Mode = uint32(s.Mode)
d.Ino = s.Ino
} else {
log.Printf("ReadDir entry %q for %q has no stat info", n, name)
}
output = append(output, d)
}
if len(infos) < want || err == io.EOF {
break
}
if err != nil {
log.Println("Readdir() returned err:", err)
break
}
}
f.Close()
return output, fuse.OK
}
func (fs *loopbackFileSystem) Open(name string, flags uint32, context *fuse.Context) (fuseFile nodefs.File, status fuse.Status) {
// filter out append. The kernel layer will translate the
// offsets for us appropriately.
flags = flags &^ syscall.O_APPEND
f, err := os.OpenFile(fs.GetPath(name), int(flags), 0)
if err != nil {
return nil, fuse.ToStatus(err)
}
return nodefs.NewLoopbackFile(f), fuse.OK
}
func (fs *loopbackFileSystem) Chmod(path string, mode uint32, context *fuse.Context) (code fuse.Status) {
err := os.Chmod(fs.GetPath(path), os.FileMode(mode))
return fuse.ToStatus(err)
}
func (fs *loopbackFileSystem) Chown(path string, uid uint32, gid uint32, context *fuse.Context) (code fuse.Status) {
return fuse.ToStatus(os.Chown(fs.GetPath(path), int(uid), int(gid)))
}
func (fs *loopbackFileSystem) Truncate(path string, offset uint64, context *fuse.Context) (code fuse.Status) {
return fuse.ToStatus(os.Truncate(fs.GetPath(path), int64(offset)))
}
func (fs *loopbackFileSystem) Readlink(name string, context *fuse.Context) (out string, code fuse.Status) {
f, err := os.Readlink(fs.GetPath(name))
return f, fuse.ToStatus(err)
}
func (fs *loopbackFileSystem) Mknod(name string, mode uint32, dev uint32, context *fuse.Context) (code fuse.Status) {
return fuse.ToStatus(syscall.Mknod(fs.GetPath(name), mode, int(dev)))
}
func (fs *loopbackFileSystem) Mkdir(path string, mode uint32, context *fuse.Context) (code fuse.Status) {
return fuse.ToStatus(os.Mkdir(fs.GetPath(path), os.FileMode(mode)))
}
// Don't use os.Remove, it removes twice (unlink followed by rmdir).
func (fs *loopbackFileSystem) Unlink(name string, context *fuse.Context) (code fuse.Status) {
return fuse.ToStatus(syscall.Unlink(fs.GetPath(name)))
}
func (fs *loopbackFileSystem) Rmdir(name string, context *fuse.Context) (code fuse.Status) {
return fuse.ToStatus(syscall.Rmdir(fs.GetPath(name)))
}
func (fs *loopbackFileSystem) Symlink(pointedTo string, linkName string, context *fuse.Context) (code fuse.Status) {
return fuse.ToStatus(os.Symlink(pointedTo, fs.GetPath(linkName)))
}
func (fs *loopbackFileSystem) Rename(oldPath string, newPath string, context *fuse.Context) (codee fuse.Status) {
oldPath = fs.GetPath(oldPath)
newPath = fs.GetPath(newPath)
err := os.Rename(oldPath, newPath)
return fuse.ToStatus(err)
}
func (fs *loopbackFileSystem) Link(orig string, newName string, context *fuse.Context) (code fuse.Status) {
return fuse.ToStatus(os.Link(fs.GetPath(orig), fs.GetPath(newName)))
}
func (fs *loopbackFileSystem) Access(name string, mode uint32, context *fuse.Context) (code fuse.Status) {
attr, status := fs.GetAttr(name, context)
if !status.Ok() {
return status
}
if !internal.HasAccess(context.Uid, context.Gid, attr.Uid, attr.Gid, attr.Mode, mode) {
return fuse.EACCES
}
return fuse.OK
}
func (fs *loopbackFileSystem) Create(path string, flags uint32, mode uint32, context *fuse.Context) (fuseFile nodefs.File, code fuse.Status) {
flags = flags &^ syscall.O_APPEND
f, err := os.OpenFile(fs.GetPath(path), int(flags)|os.O_CREATE, os.FileMode(mode))
return nodefs.NewLoopbackFile(f), fuse.ToStatus(err)
}
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