// during tests.
type OSInterface interface {
	MkdirAll(path string, perm os.FileMode) error
	Symlink(oldname string, newname string) error
	Stat(path string) (os.FileInfo, error)
	Remove(path string) error
	RemoveAll(path string) error
	Create(path string) (*os.File, error)
	Chmod(path string, perm os.FileMode) error
	Hostname() (name string, err error)
	Chtimes(path string, atime time.Time, mtime time.Time) error

	return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Namlen), unsafe.Sizeof(syscall.Dirent{}.Namlen))
}

func direntType(buf []byte) FileMode {
	off := unsafe.Offsetof(syscall.Dirent{}.Type)
	if off >= uintptr(len(buf)) {
		return ^FileMode(0) // unknown
	}
	switch syscall.Filetype(buf[off]) {
	case syscall.FILETYPE_BLOCK_DEVICE:
		return ModeDevice
	case syscall.FILETYPE_CHARACTER_DEVICE:

func (m FileMode) IsDir() bool {
	return m&ModeDir != 0
}

// IsRegular reports whether m describes a regular file.
// That is, it tests that no mode type bits are set.
func (m FileMode) IsRegular() bool {
	return m&ModeType == 0
}

// Perm returns the Unix permission bits in m (m & [ModePerm]).
func (m FileMode) Perm() FileMode {
	return m & ModePerm
}

// flags and shouldn't be considered as replacement
// for os.OpenFile().
func LockedOpenFile(path string, flag int, perm os.FileMode) (*LockedFile, error) {
	return lockedOpenFile(path, flag, perm, syscall.F_SETLKW)
}

// Open - Call os.OpenFile
func Open(path string, flag int, perm os.FileMode) (*os.File, error) {
	return os.OpenFile(path, flag, perm)

pkg os, const ModeAppend FileMode
pkg os, const ModeCharDevice FileMode
pkg os, const ModeDevice FileMode
pkg os, const ModeDir FileMode
pkg os, const ModeExclusive FileMode
pkg os, const ModeIrregular FileMode
pkg os, const ModeNamedPipe FileMode
pkg os, const ModePerm FileMode
pkg os, const ModeSetgid FileMode
pkg os, const ModeSetuid FileMode
pkg os, const ModeSocket FileMode
pkg os, const ModeSticky FileMode

type formatTest struct {
	name    string
	size    int64
	mode    FileMode
	modTime time.Time
	isDir   bool
}

func (fs *formatTest) Name() string {
	return fs.name
}

func (fs *formatTest) Size() int64 {
	return fs.size
}

func (fs *formatTest) Mode() FileMode {
	return fs.mode
}

func (fs *formatTest) ModTime() time.Time {
	return fs.modTime
}

)

// A fileStat is the implementation of FileInfo returned by Stat and Lstat.
type fileStat struct {
	name    string
	size    int64
	mode    FileMode
	modTime time.Time
	sys     any
}

func (fs *fileStat) Size() int64        { return fs.size }
func (fs *fileStat) Mode() FileMode     { return fs.mode }
func (fs *fileStat) ModTime() time.Time { return fs.modTime }
func (fs *fileStat) Sys() any           { return fs.sys }

        childResolver.fileMode == 0x1
        childResolver.dirMode == 0x2

        when:
        child.fileMode = 0x3
        child.dirMode = 0x4

        then:
        childResolver.fileMode == 0x3
        childResolver.dirMode == 0x4
    }

    def canWalkDownTreeCreatedUsingFromIntegrationTest() {

        CopySpec child = parentSpec.from('somedir') { into 'child' }

type FileInfo = fs.FileInfo

// A FileMode represents a file's mode and permission bits.
// The bits have the same definition on all systems, so that
// information about files can be moved from one system
// to another portably. Not all bits apply to all systems.
// The only required bit is [ModeDir] for directories.
type FileMode = fs.FileMode

	}

	certPath := filepath.Join(certDir, "kubelet.cert")
	keyPath := filepath.Join(certDir, "kubelet.key")
	if err := removeThenCreate(certPath, cert, os.FileMode(0644)); err != nil {
		return "", "", err
	}

	if err := removeThenCreate(keyPath, key, os.FileMode(0600)); err != nil {
		return "", "", err
	}

	return certPath, keyPath, nil
}