Mention pyproject.toml instead of PEP 517 in build log

Author: sbidoul

src/pip/_internal/commands/install.py

@@ -367,22 +367,22 @@ def run(self, options: Values, args: List[str]) -> int:
                 global_options=[],
             )
 
-            # If we're using PEP 517, we cannot do a direct install
+            # If we're using PEP 517, we cannot do a legacy setup.py install
             # so we fail here.
             pep517_build_failure_names: List[str] = [
                 r.name for r in build_failures if r.use_pep517  # type: ignore
             ]
             if pep517_build_failure_names:
                 raise InstallationError(
-                    "Could not build wheels for {} which use"
-                    " PEP 517 and cannot be installed directly".format(
+                    "Could not build wheels for {}, which is required to "
+                    "install pyproject.toml-based projects".format(
                         ", ".join(pep517_build_failure_names)
                     )
                 )
 
             # For now, we just warn about failures building legacy
-            # requirements, as we'll fall through to a direct
-            # install for those.
+            # requirements, as we'll fall through to a setup.py install for
+            # those.
             for r in build_failures:
                 if not r.use_pep517:
                     r.legacy_install_reason = 8368

src/pip/_internal/operations/build/metadata.py

@@ -23,7 +23,9 @@ def generate_metadata(build_env: BuildEnvironment, backend: Pep517HookCaller) ->
         # Note that Pep517HookCaller implements a fallback for
         # prepare_metadata_for_build_wheel, so we don't have to
         # consider the possibility that this hook doesn't exist.
-        runner = runner_with_spinner_message("Preparing wheel metadata")
+        runner = runner_with_spinner_message(
+            "Preparing wheel metadata (pyproject.toml)"
+        )
         with backend.subprocess_runner(runner):
             distinfo_dir = backend.prepare_metadata_for_build_wheel(metadata_dir)
 

src/pip/_internal/operations/build/metadata_editable.py

@@ -25,7 +25,9 @@ def generate_editable_metadata(
         # Note that Pep517HookCaller implements a fallback for
         # prepare_metadata_for_build_wheel/editable, so we don't have to
         # consider the possibility that this hook doesn't exist.
-        runner = runner_with_spinner_message("Preparing editable metadata")
+        runner = runner_with_spinner_message(
+            "Preparing editable metadata (pyproject.toml)"
+        )
         with backend.subprocess_runner(runner):
             distinfo_dir = backend.prepare_metadata_for_build_editable(metadata_dir)
 

src/pip/_internal/operations/build/wheel.py

@@ -23,7 +23,9 @@ def build_wheel_pep517(
     try:
         logger.debug("Destination directory: %s", tempd)
 
-        runner = runner_with_spinner_message(f"Building wheel for {name} (PEP 517)")
+        runner = runner_with_spinner_message(
+            f"Building wheel for {name} (pyproject.toml)"
+        )
         with backend.subprocess_runner(runner):
             wheel_name = backend.build_wheel(
                 tempd,