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// Copyright 2019 the Go-FUSE Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package posixtest
import (
"fmt"
"os"
"reflect"
"syscall"
"testing"
"github.com/hanwen/go-fuse/v2/fuse"
"golang.org/x/sys/unix"
)
// DirSeek tests that seeking on a directory works for
// https://github.com/hanwen/go-fuse/issues/344 .
//
// Go port of xfstests generic/257.
//
// Hint:
// $ go test ./fs -run TestPosix/DirSeek -v
func DirSeek(t *testing.T, mnt string) {
// From bash script xfstests/tests/generic/257
ttt := mnt + "/ttt"
err := os.Mkdir(ttt, 0700)
if err != nil {
t.Fatal(err)
}
for i := 1; i <= 168; i++ {
path := fmt.Sprintf("%s/%d", ttt, i)
err = os.WriteFile(path, nil, 0600)
if err != nil {
t.Fatal(err)
}
}
// From C app xfstests/src/t_dir_offset2.c
const bufSize = 4096
buf := make([]byte, bufSize)
fd, err := syscall.Open(ttt, syscall.O_RDONLY|syscall.O_DIRECTORY, 0)
if err != nil {
t.Fatal(err)
}
defer syscall.Close(fd)
result, err := readAllDirEntries(fd)
if err != nil {
t.Fatal(err)
}
// check if seek works correctly
for i := len(result) - 1; i >= 0; i-- {
var seekTo int64
if i > 0 {
seekTo = int64(result[i-1].Off)
}
_, err = unix.Seek(fd, seekTo, os.SEEK_SET)
if err != nil {
t.Fatal(err)
}
n, err := unix.ReadDirent(fd, buf)
if err != nil {
t.Fatal(err)
}
if n == 0 {
t.Errorf("getdents returned 0 on entry %d", i)
continue
}
var de fuse.DirEntry
de.Parse(buf)
if !reflect.DeepEqual(&de, &result[i]) {
t.Errorf("entry %d: got %v, want %v",
i, de, result[i])
}
}
}
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