/
fuse.go
179 lines (150 loc) · 3.79 KB
/
fuse.go
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package remount
import (
"context"
"errors"
"fmt"
"io"
"log"
"path"
"bazil.org/fuse"
fusefs "bazil.org/fuse/fs"
"github.com/DeedleFake/p9"
)
func FuseFS(r p9.Attachment) fusefs.FS {
return &fuseFS{root: r}
}
func ServeFuse(c *fuse.Conn, r p9.Attachment) error {
return fusefs.Serve(c, FuseFS(r))
}
type fuseFS struct {
root p9.Attachment
}
func (fs *fuseFS) Root() (fusefs.Node, error) {
return &fuseNode{n: fs.root}, nil
}
type fuseNode struct {
n p9.Attachment
p string
}
type fuseNode2 struct {
n p9.File
}
func (node *fuseNode) flags(f fuse.OpenFlags) (flags uint8) {
switch {
case f.IsReadOnly():
flags = p9.OREAD
case f.IsWriteOnly():
flags = p9.OWRITE
case f.IsReadWrite():
flags = p9.ORDWR
}
if f&fuse.OpenTruncate != 0 {
flags |= p9.OTRUNC
}
return flags
}
func (node *fuseNode) Attr(ctx context.Context, attr *fuse.Attr) error {
s, err := node.n.Stat(node.p)
if err != nil {
log.Printf("Error statting file: %v", err)
return err
}
attr.Inode = s.Path
attr.Size = s.Length
attr.Atime = s.ATime
attr.Mtime = s.MTime
attr.Mode = s.FileMode.OS()
return nil
}
func (node *fuseNode) Lookup(ctx context.Context, name string) (fusefs.Node, error) {
p := path.Join(node.p, name)
_, err := node.n.Stat(p)
if err != nil {
return nil, fuse.ENOENT
}
return &fuseNode{n: node.n, p: p}, nil
}
func (node *fuseNode) Open(ctx context.Context, req *fuse.OpenRequest, rsp *fuse.OpenResponse) (fusefs.Handle, error) {
n, err := node.n.Open(node.p, node.flags(req.Flags))
if err != nil {
log.Printf("Error opening file: %v", err)
return nil, err
}
return &fuseNode2{n: n}, nil
}
func (node *fuseNode) Create(ctx context.Context, req *fuse.CreateRequest, rsp *fuse.CreateResponse) (fusefs.Handle, error) {
n, err := node.n.Create(path.Join(node.p, req.Name), p9.ModeFromOS(req.Mode), node.flags(req.Flags))
if err != nil {
log.Printf("Error creating file: %v", err)
return nil, err
}
return &fuseNode2{n: n}, nil
}
func (node *fuseNode) Mkdir(ctx context.Context, req *fuse.MkdirRequest) (fusefs.Node, error) {
p := path.Join(node.p, req.Name)
n, err := node.n.Create(p, p9.ModeFromOS(req.Mode)|p9.ModeDir, 0)
if err != nil {
log.Printf("Error creating directory: %v", err)
return nil, err
}
err = n.Close()
if err != nil {
log.Printf("Error closing newly-created directory: %v", err)
return nil, err
}
return &fuseNode{n: node.n, p: p}, nil
}
func (node *fuseNode2) direntType(m p9.FileMode) fuse.DirentType {
switch {
case m&p9.ModeDir != 0:
return fuse.DT_Dir
case m&p9.ModeSymlink != 0:
return fuse.DT_Link
case m&p9.ModeSocket != 0:
return fuse.DT_Socket
default:
return fuse.DT_Unknown
}
}
func (node *fuseNode2) Read(ctx context.Context, req *fuse.ReadRequest, rsp *fuse.ReadResponse) error {
if req.Dir {
log.Printf("Tried to read file as a directory")
return fmt.Errorf("%#v", req)
}
buf := make([]byte, req.Size)
n, err := node.n.ReadAt(buf, req.Offset)
rsp.Data = buf[:n]
if (err != nil) && !errors.Is(err, io.EOF) {
log.Printf("Error reading file: %v", err)
return err
}
return nil
}
func (node *fuseNode2) Write(ctx context.Context, req *fuse.WriteRequest, rsp *fuse.WriteResponse) error {
n, err := node.n.WriteAt(req.Data, req.Offset)
rsp.Size = n
if err != nil {
log.Printf("Error writing file: %v", err)
return err
}
return nil
}
func (node *fuseNode2) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
e, err := node.n.Readdir()
if err != nil {
log.Printf("Error reading directory: %v", err)
return nil, err
}
r := make([]fuse.Dirent, len(e))
for i := range e {
r[i] = fuse.Dirent{
Inode: e[i].Path,
Type: node.direntType(e[i].FileMode),
Name: e[i].EntryName,
}
}
return r, nil
}
func (node *fuseNode2) Release(ctx context.Context, req *fuse.ReleaseRequest) error {
return node.n.Close()
}