build_meta: Allow dist-info and egg-info to coexist

PEP 517 does not care if other directories/files are left behind in the
`metadata_directory`, as long as a `.dist_info` directory is produced at
the root. We can leave the `.egg-info` directory behind, so this way
we don't have to run it again when listing files from `build_py`.

1 files changed, 2 insertions, 19 deletions

diff --git a/setuptools/config/expand.py b/setuptools/config/expand.py
index da55d4ee..6ea54969 100644
--- a/setuptools/config/expand.py
+++ b/setuptools/config/expand.py
@@ -43,6 +43,8 @@ from types import ModuleType
 
 from distutils.errors import DistutilsOptionError
 
+from .._path import same_path as _same_path
+
 if TYPE_CHECKING:
     from setuptools.dist import Distribution  # noqa
     from setuptools.discovery import ConfigDiscovery  # noqa
@@ -330,25 +332,6 @@ def find_packages(
     return packages
 
 
-def _same_path(p1: _Path, p2: _Path) -> bool:
-    """Differs from os.path.samefile because it does not require paths to exist.
-    Purely string based (no comparison between i-nodes).
-    >>> _same_path("a/b", "./a/b")
-    True
-    >>> _same_path("a/b", "a/./b")
-    True
-    >>> _same_path("a/b", "././a/b")
-    True
-    >>> _same_path("a/b", "./a/b/c/..")
-    True
-    >>> _same_path("a/b", "../a/b/c")
-    False
-    >>> _same_path("a", "a/b")
-    False
-    """
-    return os.path.normpath(p1) == os.path.normpath(p2)
-
-
 def _nest_path(parent: _Path, path: _Path) -> str:
     path = parent if path in {".", ""} else os.path.join(parent, path)
     return os.path.normpath(path)