Add _supported_hooks

pep517/in_process/_in_process.py

@@ -103,6 +103,19 @@ def _build_backend():
     return obj
 
 
+def _supported_hooks():
+    """Invoke the _supported_hooks pseudo hook.
+    
+    Returns a list of strings.
+    """
+    backend = _build_backend()
+    return [
+        hook_name
+        for hook_name in sorted(HOOK_NAMES)
+        if hook_name != "_supported_hooks" and hasattr(backend, hook_name)
+    ]
+
+
 def get_requires_for_build_wheel(config_settings):
     """Invoke the optional get_requires_for_build_wheel hook
 
@@ -312,6 +325,7 @@ def build_sdist(sdist_directory, config_settings):
     'build_editable',
     'get_requires_for_build_sdist',
     'build_sdist',
+    '_supported_hooks',
 }
 
 

pep517/wrappers.py

@@ -154,6 +154,9 @@ def subprocess_runner(self, runner):
         finally:
             self._subprocess_runner = prev
 
+    def _supported_hooks(self):
+        return self._call_hook('_supported_hooks', {})
+
     def get_requires_for_build_wheel(self, config_settings=None):
         """Identify packages required for building a wheel
 

tests/test_call_hooks.py

@@ -211,3 +211,27 @@ def test_setup_py():
     # Some versions of setuptools list setuptools itself here
     res = [x for x in res if x != 'setuptools']
     assert res == ['wheel']
+
+
+@pytest.mark.parametrize(
+    ("pkg", "expected"),
+    [
+        ("pkg1", [
+            "build_editable",
+            "build_sdist",
+            "build_wheel",
+            "get_requires_for_build_editable",
+            "get_requires_for_build_sdist",
+            "get_requires_for_build_wheel",
+            "prepare_metadata_for_build_editable",
+            "prepare_metadata_for_build_wheel",
+        ]),
+        ("pkg2", ["build_sdist", "build_wheel"]),
+        ("pkg3", ["build_editable", "build_sdist", "build_wheel"]),
+    ],
+)
+def test__supported_hooks(pkg, expected):
+    hooks = get_hooks(pkg)
+    with modified_env({"PYTHONPATH": BUILDSYS_PKGS}):
+        res = hooks._supported_hooks()
+    assert res == expected