00189: Instead of bundled wheels, use our RPM packaged wheels

We keep them in /usr/share/python-wheels

Downstream only: upstream bundles
We might eventually pursuit upstream support, but it's low prio

Lib/ensurepip/__init__.py

@@ -1,3 +1,5 @@
+import distutils.version
+import glob
 import os
 import os.path
 import sys
@@ -6,13 +8,29 @@
 import subprocess
 from importlib import resources
 
-from . import _bundled
-
 
 
 __all__ = ["version", "bootstrap"]
-_SETUPTOOLS_VERSION = "58.1.0"
-_PIP_VERSION = "21.2.4"
+
+_WHEEL_DIR = "/usr/share/python-wheels/"
+
+_wheels = {}
+
+def _get_most_recent_wheel_version(pkg):
+    prefix = os.path.join(_WHEEL_DIR, "{}-".format(pkg))
+    _wheels[pkg] = {}
+    for suffix in "-py2.py3-none-any.whl", "-py3-none-any.whl":
+        pattern = "{}*{}".format(prefix, suffix)
+        for path in glob.glob(pattern):
+            version_str = path[len(prefix):-len(suffix)]
+            _wheels[pkg][version_str] = os.path.basename(path)
+    return str(max(_wheels[pkg], key=distutils.version.LooseVersion))
+
+
+_SETUPTOOLS_VERSION = _get_most_recent_wheel_version("setuptools")
+
+_PIP_VERSION = _get_most_recent_wheel_version("pip")
+
 _PROJECTS = [
     ("setuptools", _SETUPTOOLS_VERSION, "py3"),
     ("pip", _PIP_VERSION, "py3"),
@@ -101,13 +119,10 @@ def _bootstrap(*, root=None, upgrade=False, user=False,
         # additional paths that need added to sys.path
         additional_paths = []
         for project, version, py_tag in _PROJECTS:
-            wheel_name = "{}-{}-{}-none-any.whl".format(project, version, py_tag)
-            whl = resources.read_binary(
-                _bundled,
-                wheel_name,
-            )
-            with open(os.path.join(tmpdir, wheel_name), "wb") as fp:
-                fp.write(whl)
+            wheel_name = _wheels[project][version]
+            with open(os.path.join(_WHEEL_DIR, wheel_name), "rb") as sfp:
+                with open(os.path.join(tmpdir, wheel_name), "wb") as fp:
+                    fp.write(sfp.read())
 
             additional_paths.append(os.path.join(tmpdir, wheel_name))