"path"
	"syscall"
	"testing"
)

// Based on `man getumask` a vaporware GNU extension to glibc.
// returns file mode creation mask.
func getUmask() int {
	mask := syscall.Umask(0)
	syscall.Umask(mask)
	return mask
}

// Tests if the directory and file creations happen with proper umask.
func TestIsValidUmaskVol(t *testing.T) {
	tmpPath := t.TempDir()
	testCases := []struct {
		volName       string
		expectedUmask int

// syscall.ENOENT (parent does not exist).
func reliableMkdirAll(dirPath string, mode os.FileMode, baseDir string) (err error) {
	i := 0
	for {
		// Creates all the parent directories, with mode 0777 mkdir honors system umask.
		if err = osMkdirAll(dirPath, mode, baseDir); err != nil {
			// Retry only for the first retryable error.
			if osIsNotExist(err) && i == 0 {
				i++
				// Determine if os.NotExist error is because of

// Forked from Golang but chooses to avoid performing lookup
//
// osMkdirAll creates a directory named path,
// along with any necessary parents, and returns nil,
// or else returns an error.
// The permission bits perm (before umask) are used for all
// directories that MkdirAll creates.
// If path is already a directory, MkdirAll does nothing
// and returns nil.
func osMkdirAll(dirPath string, perm os.FileMode, baseDir string) error {
	if baseDir != "" {

	uuid := mustGetUUID()
	filePath := pathJoin(s.drivePath, minioMetaTmpDeletedBucket, ".writable-check-"+uuid+".tmp")

	// Create top level directories if they don't exist.
	// with mode 0o777 mkdir honors system umask.
	mkdirAll(pathutil.Dir(filePath), 0o777, s.drivePath) // don't need to fail here

	w, err := s.openFileDirect(filePath, os.O_CREATE|os.O_WRONLY|os.O_EXCL)
	if err != nil {
		return err
	}

		globalThis.process = {
			getuid() { return -1; },
			getgid() { return -1; },
			geteuid() { return -1; },
			getegid() { return -1; },
			getgroups() { throw enosys(); },
			pid: -1,
			ppid: -1,
			umask() { throw enosys(); },
			cwd() { throw enosys(); },
			chdir() { throw enosys(); },
		}
	}

	if (!globalThis.path) {
		globalThis.path = {
			resolve(...pathSegments) {
				return pathSegments.join("/");

pkg syscall (freebsd-386-cgo), func TimevalToNsec(Timeval) int64
pkg syscall (freebsd-386-cgo), func Truncate(string, int64) error
pkg syscall (freebsd-386-cgo), func Umask(int) int
pkg syscall (freebsd-386-cgo), func Undelete(string) error
pkg syscall (freebsd-386-cgo), func UnixRights(...int) []uint8
pkg syscall (freebsd-386-cgo), func Unmount(string, int) error

pkg syscall (darwin-386), func TimespecToNsec(Timespec) int64
pkg syscall (darwin-386), func TimevalToNsec(Timeval) int64
pkg syscall (darwin-386), func Truncate(string, int64) error
pkg syscall (darwin-386), func Umask(int) int
pkg syscall (darwin-386), func Undelete(string) error
pkg syscall (darwin-386), func UnixRights(...int) []uint8
pkg syscall (darwin-386), func Unmount(string, int) error

pkg syscall (netbsd-arm64-cgo), func TimevalToNsec(Timeval) int64
pkg syscall (netbsd-arm64-cgo), func Truncate(string, int64) error
pkg syscall (netbsd-arm64-cgo), func Umask(int) int
pkg syscall (netbsd-arm64-cgo), func UnixRights(...int) []uint8
pkg syscall (netbsd-arm64-cgo), func Unmount(string, int) error
pkg syscall (netbsd-arm64-cgo), func Wait4(int, *WaitStatus, int, *Rusage) (int, error)

- `kubelet` will ensure /etc/hosts file is mode 0644 regardless of umask. ([#113209](https://github.com/kubernetes/kubernetes/pull/113209), [@luozhiwenn](https://github.com/luozhiwenn))

	"math"
	"math/bits"
)

// Mask allows filtering by a bitset mask.
type Mask uint64

const (
	// MaskAll is the mask for all entries.
	MaskAll Mask = math.MaxUint64
)

// MaskFromMaskable extracts mask from an interface.
func MaskFromMaskable(m Maskable) Mask {
	return Mask(m.Mask())
}

// Contains returns whether *all* flags in other is present in t.
func (t Mask) Contains(other Mask) bool {
	return t&other == other