Remove more traces of setup.py install

Author: sbidoul

docs/html/reference/build-system/setup-py.md

@@ -24,8 +24,6 @@ The overall process for building a package is:
 
 - Generate the package's metadata.
 - Generate a wheel for the package.
-  - If this fails and we're trying to install the package, attempt a direct
-    installation.
 
 The wheel can then be used to perform an installation, if necessary.
 
@@ -58,13 +56,6 @@ If this wheel generation fails, pip runs `setup.py clean` to clean up any build
 artifacts that may have been generated. After that, pip will attempt a direct
 installation.
 
-### Direct Installation
-
-When all else fails, pip will invoke `setup.py install` to install a package
-using setuptools' mechanisms to perform the installation. This is currently the
-last-resort fallback for projects that cannot be built into wheels, and may not
-be supported in the future.
-
 ### Editable Installation
 
 For installing packages in "editable" mode

tests/functional/test_install.py

@@ -1160,7 +1160,6 @@ def test_install_package_with_prefix(
     rel_prefix_path = script.scratch / "prefix"
     install_path = join(
         sysconfig.get_path("purelib", vars={"base": rel_prefix_path}),
-        # we still test for egg-info because no-binary implies setup.py install
         "simple-1.0.dist-info",
     )
     result.did_create(install_path)
@@ -1606,7 +1605,6 @@ def test_install_no_binary_builds_pep_517_wheel(
     assert expected in str(res), str(res)
 
     assert "Building wheel for pep517-setup" in str(res), str(res)
-    assert "Running setup.py install for pep517-set" not in str(res), str(res)
 
 
 @pytest.mark.network

tests/functional/test_install_reqs.py

@@ -325,7 +325,6 @@ def test_wheel_user_with_prefix_in_pydistutils_cfg(
         "install", "--user", "--no-index", "-f", data.find_links, "requiresupper"
     )
     # Check that we are really installing a wheel
-    assert "Running setup.py install for requiresupper" not in result.stdout
     assert "installed requiresupper" in result.stdout
 
 
@@ -647,7 +646,7 @@ def test_install_distribution_union_with_constraints(
         msg = "Unnamed requirements are not allowed as constraints"
         assert msg in result.stderr
     else:
-        assert "Running setup.py install for LocalExtras" in result.stdout
+        assert "Building wheel for LocalExtras" in result.stdout
         result.did_create(script.site_packages / "singlemodule.py")