"path/filepath"
	"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 {

	s := os.Getenv(envvar)
	if s == "" {
		log.Fatalf("%s not set\nrun $GOROOT/misc/ios/detect.go to attempt to autodetect", envvar)
	}
	return s
}

func assembleApp(appdir, bin string) error {
	if err := os.MkdirAll(appdir, 0755); err != nil {
		return err
	}

	if err := cp(filepath.Join(appdir, "gotest"), bin); err != nil {
		return err
	}

	pkgpath, err := copyLocalData(appdir)
	if err != nil {

pkg os, const ModeType = 2399666176
pkg os, const ModeType FileMode
pkg os, func Chmod(string, FileMode) error
pkg os, func Lstat(string) (FileInfo, error)
pkg os, func Mkdir(string, FileMode) error
pkg os, func MkdirAll(string, FileMode) error
pkg os, func OpenFile(string, int, FileMode) (*File, error)
pkg os, func SameFile(FileInfo, FileInfo) bool
pkg os, func Stat(string) (FileInfo, error)
pkg os, method (*File) Chmod(FileMode) error

pkg os, func CreateTemp(string, string) (*File, error)
pkg os, func DirFS(string) fs.FS
pkg os, func Lstat(string) (fs.FileInfo, error)
pkg os, func Mkdir(string, fs.FileMode) error
pkg os, func MkdirAll(string, fs.FileMode) error
pkg os, func MkdirTemp(string, string) (string, error)
pkg os, func OpenFile(string, int, fs.FileMode) (*File, error)
pkg os, func ReadDir(string) ([]fs.DirEntry, error)

pkg os, func Lchown(string, int, int) error
pkg os, func Link(string, string) error
pkg os, func Lstat(string) (FileInfo, error)
pkg os, func Mkdir(string, FileMode) error
pkg os, func MkdirAll(string, FileMode) error
pkg os, func NewFile(uintptr, string) *File
pkg os, func NewSyscallError(string, error) error
pkg os, func Open(string) (*File, error)
pkg os, func OpenFile(string, int, FileMode) (*File, error)