Add support for PEP-660

As with PEP-517 support, this is simply a shim over the setuptools
implementation added in setuptools v64.0.0 [1].

[1] pypa/setuptools#3488

Change-Id: I32f974db37e364cf634b050b40bf0820dce0a3a3
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>

doc/source/user/using.rst

@@ -46,10 +46,9 @@ Your build-system block in ``pyproject.toml`` will need to look something
 like this::
 
     [build-system]
-    requires = ["pbr>=5.7.0", "setuptools>=36.6.0"]
+    requires = ["pbr>=6.0.0", "setuptools>=64.0.0"]
     build-backend = "pbr.build"
 
-
 Eventually PBR may grow its own direct support for PEP517 build hooks, but
 until then it will continue to need setuptools and ``setup.py``.
 

pbr/build.py

@@ -12,15 +12,15 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-"""pep-517 support
+"""PEP-517 / PEP-660 support
 
 Add::
 
-      [build-system]
-      requires = ["pbr>=5.7.0", "setuptools>=36.6.0", "wheel"]
-      build-backend = "pbr.build"
+    [build-system]
+    requires = ["pbr>=6.0.0", "setuptools>=64.0.0"]
+    build-backend = "pbr.build"
 
-to pyproject.toml to use this
+to ``pyproject.toml`` to use this.
 """
 
 from setuptools import build_meta
@@ -31,9 +31,14 @@
     'prepare_metadata_for_build_wheel',
     'build_wheel',
     'build_sdist',
+    'build_editable',
+    'get_requires_for_build_editable',
+    'prepare_metadata_for_build_editable',
 ]
 
 
+# PEP-517
+
 def get_requires_for_build_wheel(config_settings=None):
     return build_meta.get_requires_for_build_wheel(config_settings)
 
@@ -53,9 +58,41 @@ def build_wheel(
     metadata_directory=None,
 ):
     return build_meta.build_wheel(
-        wheel_directory, config_settings, metadata_directory,
+        wheel_directory,
+        config_settings=config_settings,
+        metadata_directory=metadata_directory,
     )
 
 
 def build_sdist(sdist_directory, config_settings=None):
     return build_meta.build_sdist(sdist_directory, config_settings)
+
+
+# PEP-660
+
+def build_editable(
+    wheel_directory,
+    config_settings=None,
+    metadata_directory=None,
+):
+    return build_meta.build_editable(
+        wheel_directory,
+        config_settings=config_settings,
+        metadata_directory=metadata_directory,
+    )
+
+
+def get_requires_for_build_editable(config_settings=None):
+    return build_meta.get_requires_for_build_editable(
+        config_settings=config_settings,
+    )
+
+
+def prepare_metadata_for_build_editable(
+    metadata_directory,
+    config_settings=None,
+):
+    return build_meta.prepare_metadata_for_build_editable(
+        metadata_directory,
+        config_settings=config_settings,
+    )

pbr/tests/test_packaging.py

@@ -1023,6 +1023,11 @@ def test_pep_517_support(self):
                             Programming Language :: Python :: 3.7
                             Programming Language :: Python :: 3.8
                     """),
+                    # note that we use 36.6.0 rather than 64.0.0 since the
+                    # latter doesn't support Python < 3.8 and we run our tests
+                    # against Python 2.7 still. That's okay since we're not
+                    # testing PEP-660 functionality here (which requires the
+                    # newer setuptools)
                     'pyproject.toml': textwrap.dedent("""\
                         [build-system]
                         requires = ["pbr", "setuptools>=36.6.0", "wheel"]

pyproject.toml.future

@@ -4,7 +4,7 @@
 # once we are more confident it works generally.
 
 [build-system]
-requires = ["setuptools>=36.6.0"]
+requires = ["setuptools>=64.0.0"]
 build-backend = "pbr.build"
 backend-path = ["."]