Restore class inheritance hierararchy for build_py command class

Custom build_py written to enable support for multi-versioned DPCLSyclInterface
on Linux need to inherit from versioneer's version of build_py, rather than
from setuptools' one to incorporate the step where dpctl/_version.py
is overwritten with rendered result based on source tree.

Author: oleksandr-pavlyk

setup.cfg

@@ -3,7 +3,7 @@ VCS = git
 versionfile_source = dpctl/_version.py
 versionfile_build = dpctl/_version.py
 tag_prefix =
-parentdir_prefix = DPCTL-
+parentdir_prefix = dpctl-
 
 [bdist_wheel]
 universal=1

setup.py

@@ -22,7 +22,6 @@
 
 import numpy as np
 import setuptools.command.build_ext as orig_build_ext
-import setuptools.command.build_py as orig_build_py
 import setuptools.command.develop as orig_develop
 import setuptools.command.install as orig_install
 from Cython.Build import cythonize
@@ -254,32 +253,35 @@ def run(self):
         return super().run()
 
 
-class build_py(orig_build_py.build_py):
-    def run(self):
-        dpctl_src_dir = self.get_package_dir("dpctl")
-        dpctl_build_dir = os.path.join(self.build_lib, "dpctl")
-        os.makedirs(dpctl_build_dir, exist_ok=True)
-        if IS_LIN:
-            for fn in glob.glob(os.path.join(dpctl_src_dir, "*.so*")):
-                # Check if the file already exists before copying. The check is
-                # needed when dealing with symlinks.
-                if not os.path.exists(
-                    os.path.join(dpctl_build_dir, os.path.basename(fn))
-                ):
-                    shutil.copy(
-                        src=fn,
-                        dst=dpctl_build_dir,
-                        follow_symlinks=False,
-                    )
-        elif IS_WIN:
-            for fn in glob.glob(os.path.join(dpctl_src_dir, "*.lib")):
-                shutil.copy(src=fn, dst=dpctl_build_dir)
-
-            for fn in glob.glob(os.path.join(dpctl_src_dir, "*.dll")):
-                shutil.copy(src=fn, dst=dpctl_build_dir)
-        else:
-            raise NotImplementedError("Unsupported platform")
-        return super().run()
+def get_build_py(orig_build_py):
+    class build_py(orig_build_py):
+        def run(self):
+            dpctl_src_dir = self.get_package_dir("dpctl")
+            dpctl_build_dir = os.path.join(self.build_lib, "dpctl")
+            os.makedirs(dpctl_build_dir, exist_ok=True)
+            if IS_LIN:
+                for fn in glob.glob(os.path.join(dpctl_src_dir, "*.so*")):
+                    # Check if the file already exists before copying.
+                    # The check is needed when dealing with symlinks.
+                    if not os.path.exists(
+                        os.path.join(dpctl_build_dir, os.path.basename(fn))
+                    ):
+                        shutil.copy(
+                            src=fn,
+                            dst=dpctl_build_dir,
+                            follow_symlinks=False,
+                        )
+            elif IS_WIN:
+                for fn in glob.glob(os.path.join(dpctl_src_dir, "*.lib")):
+                    shutil.copy(src=fn, dst=dpctl_build_dir)
+
+                for fn in glob.glob(os.path.join(dpctl_src_dir, "*.dll")):
+                    shutil.copy(src=fn, dst=dpctl_build_dir)
+            else:
+                raise NotImplementedError("Unsupported platform")
+            return super().run()
+
+    return build_py
 
 
 class install(orig_install.install):
@@ -436,10 +438,10 @@ def run(self):
 
 def _get_cmdclass():
     cmdclass = versioneer.get_cmdclass()
+    cmdclass["build_py"] = get_build_py(cmdclass["build_py"])
     cmdclass["install"] = install
     cmdclass["develop"] = develop
     cmdclass["build_ext"] = build_ext
-    cmdclass["build_py"] = build_py
     return cmdclass