Merge bugfixes from distutils

newsfragments/+f0b61194.bugfix.rst

@@ -0,0 +1 @@
+Merge with pypa/distutils@251797602, including fix for dirutil.mkpath handling in pypa/distutils#304.

setuptools/_distutils/dir_util.py

@@ -32,8 +32,9 @@ def wrap(self, func):
         def wrapper(path, *args, **kwargs):
             if path.absolute() in self:
                 return
+            result = func(path, *args, **kwargs)
             self.add(path.absolute())
-            return func(path, *args, **kwargs)
+            return result
 
         return wrapper
 
@@ -44,29 +45,23 @@ def wrapper(path, *args, **kwargs):
 
 @functools.singledispatch
 @wrapper
-def mkpath(name: pathlib.Path, mode=0o777, verbose=True, dry_run=False):
+def mkpath(name: pathlib.Path, mode=0o777, verbose=True, dry_run=False) -> None:
     """Create a directory and any missing ancestor directories.
 
     If the directory already exists (or if 'name' is the empty string, which
     means the current directory, which of course exists), then do nothing.
     Raise DistutilsFileError if unable to create some directory along the way
     (eg. some sub-path exists, but is a file rather than a directory).
     If 'verbose' is true, log the directory created.
-    Return the list of directories actually created.
     """
     if verbose and not name.is_dir():
         log.info("creating %s", name)
 
-    ancestry = itertools.chain((name,), name.parents)
-    missing = (path for path in ancestry if not path.is_dir())
-
     try:
         dry_run or name.mkdir(mode=mode, parents=True, exist_ok=True)
     except OSError as exc:
         raise DistutilsFileError(f"could not create '{name}': {exc.args[-1]}")
 
-    return list(map(str, missing))
-
 
 @mkpath.register
 def _(name: str, *args, **kwargs):

setuptools/_distutils/tests/test_dir_util.py

@@ -1,6 +1,7 @@
 """Tests for distutils.dir_util."""
 
 import os
+import pathlib
 import stat
 import unittest.mock as mock
 from distutils import dir_util, errors
@@ -110,3 +111,24 @@ def test_copy_tree_exception_in_listdir(self):
         ):
             src = self.tempdirs[-1]
             dir_util.copy_tree(src, None)
+
+    def test_mkpath_exception_uncached(self, monkeypatch, tmp_path):
+        """
+        Caching should not remember failed attempts.
+
+        pypa/distutils#304
+        """
+
+        class FailPath(pathlib.Path):
+            def mkdir(self, *args, **kwargs):
+                raise OSError("Failed to create directory")
+
+        target = tmp_path / 'foodir'
+
+        with pytest.raises(errors.DistutilsFileError):
+            mkpath(FailPath(target))
+
+        assert not target.exists()
+
+        mkpath(target)
+        assert target.exists()