From 3ae89a59ad6155363fe195852999a9b669e2b395 Mon Sep 17 00:00:00 2001
From: Peter Odding <peter@peterodding.com>
Date: Sat, 12 Jul 2014 02:06:56 +0200
Subject: Replace commands that depend on setup_requires with no-op that raises
 error

---
 setup.py | 49 ++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 48 insertions(+), 1 deletion(-)

diff --git a/setup.py b/setup.py
index 145854a8..aa915f0c 100644
--- a/setup.py
+++ b/setup.py
@@ -167,7 +167,13 @@ def keywords_with_side_effects(argv):
     if len(argv) >= 2 and ('--help' in argv[1:] or
                            argv[1] in ('--help-commands', '--version',
                                        'clean', 'egg_info')):
-        return {}
+        return {
+            "cmdclass": {
+                "build": DummyCFFIBuild,
+                "install": DummyCFFIInstall,
+                "test": DummyPyTest,
+            }
+        }
     else:
         return {
             "setup_requires": requirements,
@@ -179,6 +185,47 @@ def keywords_with_side_effects(argv):
         }
 
 
+setup_requires_error = ("Requested setup command that needs 'setup_requires' "
+                        "while command line arguments implied a side effect "
+                        "free command or option.")
+
+
+class DummyCFFIBuild(CFFIBuild):
+    """
+    This class makes it very obvious when ``keywords_with_side_effects()`` has
+    incorrectly interpreted the command line arguments to ``setup.py build`` as
+    one of the 'side effect free' commands or options.
+    """
+
+    def finalize_options(self):
+        raise RuntimeError(setup_requires_error)
+
+
+class DummyCFFIInstall(CFFIInstall):
+    """
+    This class makes it very obvious when ``keywords_with_side_effects()`` has
+    incorrectly interpreted the command line arguments to ``setup.py install``
+    as one of the 'side effect free' commands or options.
+    """
+
+    def finalize_options(self):
+        raise RuntimeError(setup_requires_error)
+
+
+class DummyPyTest(PyTest):
+    """
+    This class makes it very obvious when ``keywords_with_side_effects()`` has
+    incorrectly interpreted the command line arguments to ``setup.py test`` as
+    one of the 'side effect free' commands or options.
+    """
+
+    def finalize_options(self):
+        raise RuntimeError(setup_requires_error)
+
+    def run_tests(self):
+        raise RuntimeError(setup_requires_error)
+
+
 with open(os.path.join(base_dir, "README.rst")) as f:
     long_description = f.read()
 
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