forked from TrueCloudLab/restic
106 lines
2.3 KiB
Go
106 lines
2.3 KiB
Go
package webdav
|
|
|
|
import (
|
|
"context"
|
|
"io"
|
|
"os"
|
|
|
|
"github.com/anacrolix/fuse"
|
|
"github.com/anacrolix/fuse/fs"
|
|
"github.com/restic/restic/internal/debug"
|
|
"golang.org/x/net/webdav"
|
|
)
|
|
|
|
type fuseFile interface {
|
|
fs.Node
|
|
fs.NodeOpener
|
|
}
|
|
|
|
// RepoFile implements a read-only file
|
|
type RepoFile struct {
|
|
name string
|
|
file fuseFile
|
|
handle fs.HandleReader
|
|
seek int64
|
|
size int64
|
|
ctx context.Context
|
|
}
|
|
|
|
// statically ensure that RepoFile implements webdav.File
|
|
var _ webdav.File = &RepoFile{}
|
|
|
|
func (f *RepoFile) Write(p []byte) (int, error) {
|
|
return 0, webdav.ErrForbidden
|
|
}
|
|
|
|
// Close closes the repo file.
|
|
func (f *RepoFile) Close() error {
|
|
debug.Log("Close %v", f.name)
|
|
return nil
|
|
}
|
|
|
|
// Read reads up to len(p) byte from the file.
|
|
func (f *RepoFile) Read(p []byte) (int, error) {
|
|
debug.Log("Read %v, count %d", f.name, len(p))
|
|
var err error
|
|
|
|
if f.handle == nil {
|
|
h, err := f.file.Open(f.ctx, nil, nil)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
f.handle = h.(fs.HandleReader)
|
|
}
|
|
|
|
maxread := int(f.size - f.seek)
|
|
if len(p) < maxread {
|
|
maxread = len(p)
|
|
}
|
|
if maxread <= 0 {
|
|
return 0, io.EOF
|
|
}
|
|
req := &fuse.ReadRequest{Size: maxread, Offset: f.seek}
|
|
resp := &fuse.ReadResponse{Data: p}
|
|
err = f.handle.Read(f.ctx, req, resp)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
f.seek += int64(len(resp.Data))
|
|
|
|
return len(resp.Data), nil
|
|
}
|
|
|
|
// Seek sets the offset for the next Read or Write to offset, interpreted
|
|
// according to whence: SeekStart means relative to the start of the file,
|
|
// SeekCurrent means relative to the current offset, and SeekEnd means relative
|
|
// to the end. Seek returns the new offset relative to the start of the file
|
|
// and an error, if any.
|
|
func (f *RepoFile) Seek(offset int64, whence int) (int64, error) {
|
|
debug.Log("Seek %v, offset: %d", f.name, offset)
|
|
switch whence {
|
|
case os.SEEK_SET:
|
|
f.seek = offset
|
|
case os.SEEK_CUR:
|
|
f.seek += offset
|
|
case os.SEEK_END:
|
|
f.seek = f.size + offset
|
|
}
|
|
if f.seek < 0 || f.seek > f.size {
|
|
return 0, io.EOF
|
|
}
|
|
|
|
return f.seek, nil
|
|
}
|
|
|
|
func (f *RepoFile) Readdir(count int) ([]os.FileInfo, error) {
|
|
return nil, io.EOF
|
|
}
|
|
|
|
// Stat returns a FileInfo describing the named file.
|
|
func (f *RepoFile) Stat() (os.FileInfo, error) {
|
|
debug.Log("Stat %v", f.name)
|
|
var attr fuse.Attr
|
|
f.file.Attr(f.ctx, &attr)
|
|
|
|
return fileInfoFromAttr(f.name, attr), nil
|
|
}
|