80 lines
1.6 KiB
Go
80 lines
1.6 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
|
|
// Author: jacobsa@google.com (Aaron Jacobs)
|
|
|
|
package samples
|
|
|
|
import (
|
|
"github.com/jacobsa/fuse"
|
|
"github.com/jacobsa/fuse/fuseutil"
|
|
"github.com/jacobsa/gcsfuse/timeutil"
|
|
"golang.org/x/net/context"
|
|
)
|
|
|
|
// A file system with a fixed structure that looks like this:
|
|
//
|
|
// hello
|
|
// dir/
|
|
// world
|
|
//
|
|
// Each file contains the string "Hello, world!".
|
|
type HelloFS struct {
|
|
fuseutil.NotImplementedFileSystem
|
|
Clock timeutil.Clock
|
|
}
|
|
|
|
var _ fuse.FileSystem = &HelloFS{}
|
|
|
|
const (
|
|
rootInode fuse.InodeID = fuse.RootInodeID + iota
|
|
helloInode
|
|
dirInode
|
|
worldInode
|
|
)
|
|
|
|
func (fs *HelloFS) OpenDir(
|
|
ctx context.Context,
|
|
req *fuse.OpenDirRequest) (resp *fuse.OpenDirResponse, err error) {
|
|
// We always allow opening the root directory.
|
|
if req.Inode == rootInode {
|
|
resp = &fuse.OpenDirResponse{}
|
|
return
|
|
}
|
|
|
|
// TODO(jacobsa): Handle others.
|
|
err = fuse.ENOSYS
|
|
return
|
|
}
|
|
|
|
// We have a fixed directory structure.
|
|
var gDirectoryEntries = map[fuse.InodeID][]fuseutil.Dirent{}
|
|
|
|
func (fs *HelloFS) ReadDir(
|
|
ctx context.Context,
|
|
req *fuse.ReadDirRequest) (resp *fuse.ReadDirResponse, err error) {
|
|
resp = &fuse.ReadDirResponse{}
|
|
|
|
// Find the entries for this inode.
|
|
entries, ok := gDirectoryEntries[req.Inode]
|
|
if !ok {
|
|
err = fuse.ENOENT
|
|
return
|
|
}
|
|
|
|
// Check the offset.
|
|
if req.Offset >= fuse.DirOffset(len(entries)) {
|
|
err = fuse.EIO
|
|
return
|
|
}
|
|
|
|
// Resume at the specified offset into the array.
|
|
for _, e := range entries {
|
|
resp.Data = fuseutil.AppendDirent(resp.Data, e)
|
|
if len(resp.Data) > req.Size {
|
|
resp.Data = resp.Data[:req.Size]
|
|
break
|
|
}
|
|
}
|
|
|
|
return
|
|
}
|