Replace distutils with sysconfig on Python 3.12+

Author: uranusjr

tests/functional/test_build_env.py

@@ -1,4 +1,5 @@
 import os
+import sys
 from textwrap import dedent
 from typing import Optional
 
@@ -203,6 +204,31 @@ def test_build_env_overlay_prefix_has_priority(script: PipTestEnvironment) -> No
     assert result.stdout.strip() == "2.0", str(result)
 
 
+if sys.version_info < (3, 12):
+    BUILD_ENV_ERROR_DEBUG_CODE = r"""
+            from distutils.sysconfig import get_python_lib
+            print(
+                f'imported `pkg` from `{pkg.__file__}`',
+                file=sys.stderr)
+            print('system sites:\n  ' + '\n  '.join(sorted({
+                            get_python_lib(plat_specific=0),
+                            get_python_lib(plat_specific=1),
+                    })), file=sys.stderr)
+    """
+else:
+    BUILD_ENV_ERROR_DEBUG_CODE = r"""
+            from sysconfig import get_paths
+            paths = get_paths()
+            print(
+                f'imported `pkg` from `{pkg.__file__}`',
+                file=sys.stderr)
+            print('system sites:\n  ' + '\n  '.join(sorted({
+                            paths['platlib'],
+                            paths['purelib'],
+                    })), file=sys.stderr)
+    """
+
+
 @pytest.mark.usefixtures("enable_user_site")
 def test_build_env_isolation(script: PipTestEnvironment) -> None:
     # Create dummy `pkg` wheel.
@@ -231,26 +257,17 @@ def test_build_env_isolation(script: PipTestEnvironment) -> None:
     run_with_build_env(
         script,
         "",
-        r"""
-        from distutils.sysconfig import get_python_lib
+        f"""
         import sys
 
         try:
             import pkg
         except ImportError:
             pass
         else:
-            print(
-                f'imported `pkg` from `{pkg.__file__}`',
-                file=sys.stderr)
-            print('system sites:\n  ' + '\n  '.join(sorted({
-                          get_python_lib(plat_specific=0),
-                          get_python_lib(plat_specific=1),
-                    })), file=sys.stderr)
-            print('sys.path:\n  ' + '\n  '.join(sys.path), file=sys.stderr)
+            {BUILD_ENV_ERROR_DEBUG_CODE}
+            print('sys.path:\\n  ' + '\\n  '.join(sys.path), file=sys.stderr)
             sys.exit(1)
-        """
-        f"""
         # second check: direct check of exclusion of system site packages
         import os