Bypass environment marker evaluation in requirements resolution. Ref #523.

CHANGES.txt

@@ -2,6 +2,12 @@
 CHANGES
 =======
 
+v20.6.7
+-------
+
+* Issue #523: Disabled support for environment markers
+  introduced in v20.5.
+
 v20.6.6
 -------
 

pkg_resources/__init__.py

@@ -804,8 +804,10 @@ class WorkingSet(object):
                 continue
             # If the req has a marker, evaluate it -- skipping the req if
             # it evaluates to False.
-            if req.marker and not req.marker.evaluate():
-                continue
+            # https://github.com/pypa/setuptools/issues/523
+            _issue_523_bypass = True
+            if not _issue_523_bypass and req.marker and not req.marker.evaluate():
+                    continue
             dist = best.get(req.key)
             if dist is None:
                 # Find the best distribution and add it to the map

pkg_resources/tests/test_resources.py

@@ -182,6 +182,7 @@ class TestDistro:
         msg = 'Foo 0.9 is installed but Foo==1.2 is required'
         assert vc.value.report() == msg
 
+    @pytest.mark.xfail(reason="Functionality disabled; see #523")
     def test_environment_markers(self):
         """
         Environment markers are evaluated at resolution time.

setuptools/tests/test_egg_info.py

@@ -104,6 +104,7 @@ class TestEggInfo(object):
             'setup.py': setup_script,
             })
 
+    @pytest.mark.xfail(reason="Functionality disabled; see #523")
     def test_install_requires_with_markers(self, tmpdir_cwd, env):
         self._setup_script_with_requires(
             """install_requires=["barbazquux;python_version<'2'"],""")
@@ -114,12 +115,14 @@ class TestEggInfo(object):
             requires_txt).read().split('\n')
         assert glob.glob(os.path.join(env.paths['lib'], 'barbazquux*')) == []
 
+    @pytest.mark.xfail(reason="Functionality disabled; see #523")
     def test_setup_requires_with_markers(self, tmpdir_cwd, env):
         self._setup_script_with_requires(
             """setup_requires=["barbazquux;python_version<'2'"],""")
         self._run_install_command(tmpdir_cwd, env)
         assert glob.glob(os.path.join(env.paths['lib'], 'barbazquux*')) == []
 
+    @pytest.mark.xfail(reason="Functionality disabled; see #523")
     def test_tests_require_with_markers(self, tmpdir_cwd, env):
         self._setup_script_with_requires(
             """tests_require=["barbazquux;python_version<'2'"],""")