libgocryptfs/internal/syscallcompat/getdents_other.go
Jakob Unterwurzacher 70bcf58a9b syscallcompat: convert Getdents to fd input, add emulation
Now that we have Fstatat we can use it in Getdents to
get rid of the path name.

Also, add an emulated version of getdents for MacOS. This allows
to drop the !HaveGetdents special cases from fusefrontend.

Modify the getdents test to test both native getdents and the emulated
version.
2017-12-03 19:33:26 +01:00

50 lines
1.1 KiB
Go

package syscallcompat
import (
"os"
"syscall"
"golang.org/x/sys/unix"
"github.com/hanwen/go-fuse/fuse"
)
// emulateGetdents reads all directory entries from the open directory "fd"
// and returns them in a fuse.DirEntry slice.
func emulateGetdents(fd int) (out []fuse.DirEntry, err error) {
// os.File closes the fd in its finalizer. Duplicate the fd to not affect
// the original fd.
newFd, err := syscall.Dup(fd)
if err != nil {
return nil, err
}
f := os.NewFile(uintptr(newFd), "")
defer f.Close()
// Get all file names in the directory
names, err := f.Readdirnames(0)
if err != nil {
return nil, err
}
// Stat all of them and convert to fuse.DirEntry
out = make([]fuse.DirEntry, 0, len(names))
for _, name := range names {
var st unix.Stat_t
err = Fstatat(fd, name, &st, unix.AT_SYMLINK_NOFOLLOW)
if err == syscall.ENOENT {
// File disappeared between readdir and stat. Pretend we did not
// see it.
continue
}
if err != nil {
return nil, err
}
newEntry := fuse.DirEntry{
Name: name,
Mode: uint32(st.Mode) & syscall.S_IFMT,
Ino: st.Ino,
}
out = append(out, newEntry)
}
return out, nil
}