Merge exists() and islink() checks.

Lib/shutil.py

@@ -590,17 +590,13 @@ def copytree(src, dst, symlinks=False, ignore=None, copy_function=copy2,
                      dirs_exist_ok=dirs_exist_ok)
 
 if hasattr(os.stat_result, 'st_file_attributes'):
-    def _rmtree_islink(path):
-        try:
-            st = os.lstat(path)
-            return (stat.S_ISLNK(st.st_mode) or
-                (st.st_file_attributes & stat.FILE_ATTRIBUTE_REPARSE_POINT
-                 and st.st_reparse_tag == stat.IO_REPARSE_TAG_MOUNT_POINT))
-        except OSError:
-            return False
+    def _rmtree_islink(st):
+        return (stat.S_ISLNK(st.st_mode) or
+            (st.st_file_attributes & stat.FILE_ATTRIBUTE_REPARSE_POINT
+                and st.st_reparse_tag == stat.IO_REPARSE_TAG_MOUNT_POINT))
 else:
-    def _rmtree_islink(path):
-        return os.path.islink(path)
+    def _rmtree_islink(st):
+        return stat.S_ISLNK(st.st_mode)
 
 # version vulnerable to race conditions
 def _rmtree_unsafe(path, onexc):
@@ -808,20 +804,18 @@ def onexc(*args):
         if dir_fd is not None:
             raise NotImplementedError("dir_fd unavailable on this platform")
         try:
-            if _rmtree_islink(path):
+            st = os.lstat(path)
+        except OSError as err:
+            onexc(os.lstat, path, err)
+            return
+        try:
+            if _rmtree_islink(st):
                 # symlinks to directories are forbidden, see bug #1669
                 raise OSError("Cannot call rmtree on a symbolic link")
         except OSError as err:
             onexc(os.path.islink, path, err)
             # can't continue even if onexc hook returns
             return
-        try:
-            if not os.path.exists(path):
-                raise FileNotFoundError(errno.ENOENT,
-                        "Cannot call rmtree on a non-existent path", path)
-        except OSError as err:
-            onexc(os.path.exists, path, err)
-            return
         return _rmtree_unsafe(path, onexc)
 
 # Allow introspection of whether or not the hardening against symlink