ref: 8683c3275fca6a12ddf1813a877c7e7fb739a097
dir: /mntgen.go/
package main
import (
"bazil.org/fuse"
"bazil.org/fuse/fs"
"context"
"fmt"
"os"
"os/signal"
"sync/atomic"
"syscall"
"time"
)
var inodeCount uint64
type Node interface {
fs.Node
}
type Dir struct {
Fs *FS
Name string
Attributes fuse.Attr
Entries map[string]*Dir
}
func NewDir(fs *FS, name string) *Dir {
atomic.AddUint64(&inodeCount, 1)
return &Dir{
Fs: fs,
Name: name,
Attributes: fuse.Attr{
Inode: inodeCount,
Atime: time.Now(),
Mtime: time.Now(),
Ctime: time.Now(),
Mode: os.ModeDir | 0o755,
Nlink: 2,
Uid: uint32(os.Getuid()),
Gid: uint32(os.Getgid()),
},
Entries: make(map[string]*Dir),
}
}
func (d *Dir) Attr(ctx context.Context, a *fuse.Attr) error {
*a = d.Attributes
return nil
}
func (d *Dir) Lookup(ctx context.Context, name string) (fs.Node, error) {
if d == d.Fs.RootDir {
if node, ok := d.Entries[name]; ok {
return node, nil
} else {
nd := NewDir(d.Fs, name)
d.Entries[name] = nd
return nd, nil
}
}
return nil, syscall.ENOENT
}
func (d *Dir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
var entries []fuse.Dirent
for k, v := range d.Entries {
var a fuse.Attr
v.Attr(ctx, &a)
entries = append(entries, fuse.Dirent{
Inode: a.Inode,
Type: fuse.DT_Dir,
Name: k,
})
}
return entries, nil
}
type FS struct {
RootDir *Dir
}
func NewFS() *FS {
fs := &FS{}
fs.RootDir = NewDir(fs, "")
return fs
}
func (fs FS) Root() (fs.Node, error) {
return fs.RootDir, nil
}
func usage() {
fmt.Fprintf(os.Stderr, "usage: %s [ mnt ]\n", os.Args[0])
os.Exit(1)
}
func main() {
mtpt := "/n"
switch len(os.Args) {
case 1:
case 2:
mtpt = os.Args[1]
default:
usage()
}
c, err := fuse.Mount(mtpt, fuse.FSName("mntgen"), fuse.Subtype("mntgen"), fuse.AllowOther())
if err != nil {
fmt.Fprintf(os.Stderr, "mount: %v\n", err)
os.Exit(1)
}
defer c.Close()
sigc := make(chan os.Signal, 1)
signal.Notify(sigc, syscall.SIGTERM, syscall.SIGINT)
go func() {
for {
<-sigc
if err := fuse.Unmount(mtpt); err != nil {
fmt.Fprintf(os.Stderr, "unmount failed: %v\n", err)
}
}
}()
err = fs.Serve(c, NewFS())
if err != nil {
fmt.Fprintf(os.Stderr, "serve: %v\n", err)
os.Exit(1)
}
}