"syscall"
	"time"
)

func fillFileStatFromSys(fs *fileStat, name string) {
	fs.name = filepathlite.Base(name)
	fs.size = fs.sys.Size
	fs.modTime = time.Unix(fs.sys.Mtim.Unix())
	fs.mode = FileMode(fs.sys.Mode & 0777)
	switch fs.sys.Mode & syscall.S_IFMT {
	case syscall.S_IFBLK:
		fs.mode |= ModeDevice
	case syscall.S_IFCHR:
		fs.mode |= ModeDevice | ModeCharDevice
	case syscall.S_IFDIR:
		fs.mode |= ModeDir

	for i := 0; i < 10; i++ {
		b := byte(0)
		if i > 5 {
			b = byte(i)
		}
        tmpl := "go test fuzz v1\nint(%d)\n"
		if err := os.WriteFile(filepath.Join(os.Args[1], fmt.Sprint(i)), []byte(fmt.Sprintf(tmpl, b)), 0777); err != nil {
			panic(err)
		}
	}

	"time"
)

func fillFileStatFromSys(fs *fileStat, name string) {
	fs.name = filepathlite.Base(name)
	fs.size = fs.sys.Size
	fs.modTime = time.Unix(fs.sys.Mtimespec.Unix())
	fs.mode = FileMode(fs.sys.Mode & 0777)
	switch fs.sys.Mode & syscall.S_IFMT {
	case syscall.S_IFBLK, syscall.S_IFWHT:
		fs.mode |= ModeDevice
	case syscall.S_IFCHR:
		fs.mode |= ModeDevice | ModeCharDevice
	case syscall.S_IFDIR:
		fs.mode |= ModeDir

	"syscall"
	"time"
)

func fillFileStatFromSys(fs *fileStat, name string) {
	fs.name = filepathlite.Base(name)
	fs.size = fs.sys.Size
	fs.modTime = time.Unix(fs.sys.Mtim.Unix())
	fs.mode = FileMode(fs.sys.Mode & 0777)
	switch fs.sys.Mode & syscall.S_IFMT {
	case syscall.S_IFBLK:
		fs.mode |= ModeDevice
	case syscall.S_IFCHR:
		fs.mode |= ModeDevice | ModeCharDevice
	case syscall.S_IFDIR:
		fs.mode |= ModeDir

		// Create the directory structure
		for _, item := range test.items {
			if strings.HasSuffix(item, "/") {
				item = strings.TrimRight(item, "/")
				if err = os.Mkdir(filepath.Join(tmpDir, item), 0777); err != nil {
					t.Fatalf("error creating %s: %v", item, err)
				}
			} else {
				f, err := os.Create(filepath.Join(tmpDir, item))
				if err != nil {
					t.Fatalf("error creating %s: %v", item, err)
				}

	"time"
)

func fillFileStatFromSys(fs *fileStat, name string) {
	fs.name = filepathlite.Base(name)
	fs.size = fs.sys.Size
	fs.modTime = time.Unix(fs.sys.Mtime, fs.sys.MtimeNsec)
	fs.mode = FileMode(fs.sys.Mode & 0777)
	switch fs.sys.Mode & syscall.S_IFMT {
	case syscall.S_IFBLK:
		fs.mode |= ModeDevice
	case syscall.S_IFCHR:
		fs.mode |= ModeDevice | ModeCharDevice
	case syscall.S_IFDIR:
		fs.mode |= ModeDir

	_S_IFPORT = 0xe000
)

func fillFileStatFromSys(fs *fileStat, name string) {
	fs.name = filepathlite.Base(name)
	fs.size = fs.sys.Size
	fs.modTime = time.Unix(fs.sys.Mtim.Unix())
	fs.mode = FileMode(fs.sys.Mode & 0777)
	switch fs.sys.Mode & syscall.S_IFMT {
	case syscall.S_IFBLK:
		fs.mode |= ModeDevice
	case syscall.S_IFCHR:
		fs.mode |= ModeDevice | ModeCharDevice
	case syscall.S_IFDIR:
		fs.mode |= ModeDir

func genAuxMeta(t *testing.T, dstdir string) (string, string) {
	// Do a GOCOVERDIR=<tmp> go run hello.go
	src := filepath.Join(dstdir, "hello.go")
	if err := os.WriteFile(src, []byte(hellogo), 0777); err != nil {
		t.Fatalf("write failed: %v", err)
	}
	args := []string{"run", "-covermode=" + testing.CoverMode(), src}
	cmd := exec.Command(testenv.GoToolPath(t), args...)

		t.Fatal(err)
	}
}

func TestMapFSChmodDot(t *testing.T) {
	m := MapFS{
		"a/b.txt": &MapFile{Mode: 0666},
		".":       &MapFile{Mode: 0777 | fs.ModeDir},
	}
	buf := new(strings.Builder)
	fs.WalkDir(m, ".", func(path string, d fs.DirEntry, err error) error {
		fi, err := d.Info()
		if err != nil {
			return err
		}

	"strings"
)

// OverlayDir makes a minimal-overhead copy of srcRoot in which new files may be added.
func OverlayDir(dstRoot, srcRoot string) error {
	dstRoot = filepath.Clean(dstRoot)
	if err := os.MkdirAll(dstRoot, 0777); err != nil {
		return err
	}

	srcRoot, err := filepath.Abs(srcRoot)
	if err != nil {
		return err
	}

	return filepath.Walk(srcRoot, func(srcPath string, info os.FileInfo, err error) error {