# DP: Avoid shutil import when it is not available.

Index: b/Lib/tempfile.py
===================================================================
--- a/Lib/tempfile.py
+++ b/Lib/tempfile.py
@@ -40,7 +40,146 @@ import functools as _functools
 import warnings as _warnings
 import io as _io
 import os as _os
-import shutil as _shutil
+try:
+  import shutil as _shutil
+  _rmtree = _shutil.rmtree
+except ImportError:
+  import sys as _sys
+  import stat as _stat
+  # version vulnerable to race conditions
+  def _rmtree_unsafe(path, onerror):
+    try:
+        if _os.path.islink(path):
+            # symlinks to directories are forbidden, see bug #1669
+            raise OSError("Cannot call rmtree on a symbolic link")
+    except OSError:
+        onerror(_os.path.islink, path, _sys.exc_info())
+        # can't continue even if onerror hook returns
+        return
+    names = []
+    try:
+        names = _os.listdir(path)
+    except OSError:
+        onerror(_os.listdir, path, _sys.exc_info())
+    for name in names:
+        fullname = _os.path.join(path, name)
+        try:
+            mode = _os.lstat(fullname).st_mode
+        except OSError:
+            mode = 0
+        if _stat.S_ISDIR(mode):
+            _rmtree_unsafe(fullname, onerror)
+        else:
+            try:
+                _os.unlink(fullname)
+            except OSError:
+                onerror(_os.unlink, fullname, _sys.exc_info())
+    try:
+        _os.rmdir(path)
+    except OSError:
+        onerror(_os.rmdir, path, _sys.exc_info())
+
+  # Version using fd-based APIs to protect against races
+  def _rmtree_safe_fd(topfd, path, onerror):
+    names = []
+    try:
+        names = _os.listdir(topfd)
+    except OSError as err:
+        err.filename = path
+        onerror(_os.listdir, path, _sys.exc_info())
+    for name in names:
+        fullname = _os.path.join(path, name)
+        try:
+            orig_st = _os.stat(name, dir_fd=topfd, follow_symlinks=False)
+            mode = orig_st.st_mode
+        except OSError:
+            mode = 0
+        if _stat.S_ISDIR(mode):
+            try:
+                dirfd = _os.open(name, _os.O_RDONLY, dir_fd=topfd)
+            except OSError:
+                onerror(_os.open, fullname, _sys.exc_info())
+            else:
+                try:
+                    if _os.path.samestat(orig_st, _os.fstat(dirfd)):
+                        _rmtree_safe_fd(dirfd, fullname, onerror)
+                        try:
+                            _os.rmdir(name, dir_fd=topfd)
+                        except OSError:
+                            onerror(_os.rmdir, fullname, _sys.exc_info())
+                    else:
+                        try:
+                            # This can only happen if someone replaces
+                            # a directory with a symlink after the call to
+                            # stat.S_ISDIR above.
+                            raise OSError("Cannot call rmtree on a symbolic "
+                                          "link")
+                        except OSError:
+                            onerror(_os.path.islink, fullname, _sys.exc_info())
+                finally:
+                    _os.close(dirfd)
+        else:
+            try:
+                _os.unlink(name, dir_fd=topfd)
+            except OSError:
+                onerror(_os.unlink, fullname, _sys.exc_info())
+
+  _use_fd_functions = ({_os.open, _os.stat, _os.unlink, _os.rmdir} <=
+                     _os.supports_dir_fd and
+                     _os.listdir in _os.supports_fd and
+                     _os.stat in _os.supports_follow_symlinks)
+
+  def _rmtree(path, ignore_errors=False, onerror=None):
+    """Recursively delete a directory tree.
+
+    If ignore_errors is set, errors are ignored; otherwise, if onerror
+    is set, it is called to handle the error with arguments (func,
+    path, exc_info) where func is platform and implementation dependent;
+    path is the argument to that function that caused it to fail; and
+    exc_info is a tuple returned by sys.exc_info().  If ignore_errors
+    is false and onerror is None, an exception is raised.
+
+    """
+    if ignore_errors:
+        def onerror(*args):
+            pass
+    elif onerror is None:
+        def onerror(*args):
+            raise
+    if _use_fd_functions:
+        # While the unsafe rmtree works fine on bytes, the fd based does not.
+        if isinstance(path, bytes):
+            path = _os.fsdecode(path)
+        # Note: To guard against symlink races, we use the standard
+        # lstat()/open()/fstat() trick.
+        try:
+            orig_st = _os.lstat(path)
+        except Exception:
+            onerror(_os.lstat, path, _sys.exc_info())
+            return
+        try:
+            fd = _os.open(path, _os.O_RDONLY)
+        except Exception:
+            onerror(_os.lstat, path, _sys.exc_info())
+            return
+        try:
+            if _os.path.samestat(orig_st, _os.fstat(fd)):
+                _rmtree_safe_fd(fd, path, onerror)
+                try:
+                    _os.rmdir(path)
+                except OSError:
+                    onerror(_os.rmdir, path, _sys.exc_info())
+            else:
+                try:
+                    # symlinks to directories are forbidden, see bug #1669
+                    raise OSError("Cannot call rmtree on a symbolic link")
+                except OSError:
+                    onerror(_os.path.islink, path, _sys.exc_info())
+        finally:
+            _os.close(fd)
+    else:
+        return _rmtree_unsafe(path, onerror)
+
 import errno as _errno
 from random import Random as _Random
 import weakref as _weakref
@@ -794,7 +933,7 @@ class TemporaryDirectory(object):
 
     @classmethod
     def _cleanup(cls, name, warn_message):
-        _shutil.rmtree(name)
+        _rmtree(name)
         _warnings.warn(warn_message, ResourceWarning)
 
 
@@ -809,4 +948,4 @@ class TemporaryDirectory(object):
 
     def cleanup(self):
         if self._finalizer.detach():
-            _shutil.rmtree(self.name)
+            _rmtree(self.name)