Clean up hacking and path issues with d2to1

We imported in another code base. It takes a little bit of path
adjusting to get things right.

Change-Id: Ifb96652c822d5d243a6bedb77bc34e919be2d3a8

README.rst

@@ -13,9 +13,20 @@ it's simple and repeatable. If you want to do things differently, cool! But
 you've already got the power of python at your fingertips, so you don't
 really need PBR.
 
-PBR builds on top of `d2to1` to provide for declarative configuration. It
-then filters the `setup.cfg` data through a setup hook to fill in default
-values and provide more sensible behaviors.
+PBR builds on top of the work that `d2to1` started to provide for declarative
+configuration. `d2to1` is itself an implementation of the ideas behind
+`distutils2`. Although `distutils2` is now abandoned in favor of work towards
+PEP 426 and Metadata 2.0, declarative config is still a great idea and
+specifically important in trying to distribute setup code as a library
+when that library itself will alter how the setup is processed. As Metadata
+2.0 and other modern Python packaging PEPs come out, `pbr` aims to support
+them as quickly as possible.
+
+`pbr` reads and then filters the `setup.cfg` data through a setup hook to
+fill in default values and provide more sensible behaviors, and then feeds
+the results in as the arguments to a call to `setup.py` - so the heavy
+lifting of handling python packaging needs is still being done by
+`setuptools`.
 
 Behaviors
 =========
@@ -124,11 +135,11 @@ The minimal setup.py should look something like this::
  from setuptools import setup
 
  setup(
-     setup_requires=['d2to1', 'pbr'],
-     d2to1=True,
+     setup_requires=['pbr'],
+     pbr=True,
  )
 
-Note that it's important to specify `d2to1=True` or else the pbr functionality
+Note that it's important to specify `pbr=True` or else the pbr functionality
 will not be enabled.
 
 It should also work fine if additional arguments are passed to `setup()`,

pbr/tests/test_version.py

@@ -28,4 +28,4 @@ class DeferredVersionTestCase(tests.BaseTestCase):
 
         deferred_string = MyVersionInfo("openstack").\
             cached_version_string()
-        self.assertEquals("5.5.5.5", deferred_string)
+        self.assertEqual("5.5.5.5", deferred_string)

setup.cfg

@@ -6,6 +6,7 @@ summary = Python Build Reasonableness
 description-file =
     README.rst
 home-page = http://pypi.python.org/pypi/pbr
+requires-python = >=2.6
 classifier = 
     Development Status :: 4 - Beta
         Environment :: Console
@@ -26,3 +27,7 @@ setup-hooks =
 
 [pbr]
 warnerrors = True
+
+[entry_points]
+distutils.setup_keywords = 
+    pbr = pbr.core:pbr

setup.py

@@ -16,6 +16,7 @@
 
 import setuptools
 
+from pbr.d2to1 import util
+
 setuptools.setup(
-    setup_requires=['d2to1>=0.2.10,<0.3'],
-    d2to1=True)
+    **util.cfg_to_args())

tox.ini

@@ -9,7 +9,7 @@ setenv = VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands =
-  python setup.py testr --slowest --testr-args='{posargs}'
+  python setup.py testr --testr-args='{posargs}'
 
 [tox:jenkins]
 sitepackages = True