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package syscallcompat
import (
"os"
"syscall"
"golang.org/x/sys/unix"
"github.com/hanwen/go-fuse/v2/fuse"
)
func fillDirEntries(fd int, names []string) ([]fuse.DirEntry, error) {
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
}
// emulateGetdents reads all directory entries from the open directory "fd"
// and returns normal entries and "." / ".." split into two slices.
func emulateGetdents(fd int) (out []fuse.DirEntry, outSpecial []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, 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, nil, err
}
// Stat all the names and convert to fuse.DirEntry
out, err = fillDirEntries(fd, names)
if err != nil {
return nil, nil, err
}
outSpecial, err = fillDirEntries(fd, []string{".", ".."})
if err != nil {
return nil, nil, err
}
return out, outSpecial, nil
}
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