Add per-requirement --config-settings

news/11325.feature.rst

@@ -0,0 +1 @@
+Support a per-requirement ``--config-settings`` option.

src/pip/_internal/cli/req_command.py

@@ -438,6 +438,9 @@ class RequirementCommand(IndexGroupCommand):
                     isolated=options.isolated_mode,
                     use_pep517=options.use_pep517,
                     user_supplied=True,
+                    config_settings=parsed_req.options.get("config_settings")
+                    if parsed_req.options
+                    else None,
                 )
                 requirements.append(req_to_add)
 

src/pip/_internal/req/req_file.py

@@ -72,6 +72,7 @@ SUPPORTED_OPTIONS_REQ: List[Callable[..., optparse.Option]] = [
     cmdoptions.install_options,
     cmdoptions.global_options,
     cmdoptions.hash,
+    cmdoptions.config_settings,
 ]
 
 # the 'dest' string values

src/pip/_internal/req/req_install.py

@@ -150,6 +150,8 @@ class InstallRequirement:
         self.global_options = global_options if global_options else []
         self.hash_options = hash_options if hash_options else {}
         self.config_settings = config_settings
+        if isinstance(comes_from, InstallRequirement) and comes_from.config_settings:
+            self.config_settings = comes_from.config_settings
         # Set to True after successful preparation of this requirement
         self.prepared = False
         # User supplied requirement are explicitly requested for installation

tests/functional/test_config_settings.py

@@ -112,6 +112,20 @@ def test_backend_sees_config(script: PipTestEnvironment) -> None:
             assert json.loads(output) == {"FOO": "Hello"}
 
 
+def test_backend_sees_config_reqs(script: PipTestEnvironment) -> None:
+    name, version, project_dir = make_project(script.scratch_path)
+    script.scratch_path.joinpath("reqs.txt").write_text(
+        f"{project_dir} --config-settings FOO=Hello"
+    )
+    script.pip("wheel", "-r", "reqs.txt")
+    wheel_file_name = f"{name}-{version}-py3-none-any.whl"
+    wheel_file_path = script.cwd / wheel_file_name
+    with open(wheel_file_path, "rb") as f:
+        with ZipFile(f) as z:
+            output = z.read("config.json")
+            assert json.loads(output) == {"FOO": "Hello"}
+
+
 def test_install_sees_config(script: PipTestEnvironment) -> None:
     _, _, project_dir = make_project(script.scratch_path)
     script.pip(
@@ -125,6 +139,17 @@ def test_install_sees_config(script: PipTestEnvironment) -> None:
         assert json.load(f) == {"FOO": "Hello"}
 
 
+def test_install_sees_config_reqs(script: PipTestEnvironment) -> None:
+    _, _, project_dir = make_project(script.scratch_path)
+    script.scratch_path.joinpath("reqs.txt").write_text(
+        f"{project_dir} --config-settings FOO=Hello"
+    )
+    script.pip("install", "-r", "reqs.txt")
+    config = script.site_packages_path / "config.json"
+    with open(config, "rb") as f:
+        assert json.load(f) == {"FOO": "Hello"}
+
+
 def test_install_editable_sees_config(script: PipTestEnvironment) -> None:
     _, _, project_dir = make_project(script.scratch_path)
     script.pip(

tests/unit/test_req_file.py

@@ -74,7 +74,13 @@ def parse_reqfile(
         options=options,
         constraint=constraint,
     ):
-        yield install_req_from_parsed_requirement(parsed_req, isolated=isolated)
+        yield install_req_from_parsed_requirement(
+            parsed_req,
+            isolated=isolated,
+            config_settings=parsed_req.options.get("config_settings")
+            if parsed_req.options
+            else None,
+        )
 
 
 def test_read_file_url(tmp_path: Path, session: PipSession) -> None:
@@ -346,12 +352,14 @@ class TestProcessLine:
     def test_options_on_a_requirement_line(self, line_processor: LineProcessor) -> None:
         line = (
             "SomeProject --install-option=yo1 --install-option yo2 "
-            '--global-option="yo3" --global-option "yo4"'
+            '--global-option="yo3" --global-option "yo4" '
+            '--config-settings="yo3=yo4" --config-settings "yo1=yo2"'
         )
         filename = "filename"
         req = line_processor(line, filename, 1)[0]
         assert req.global_options == ["yo3", "yo4"]
         assert req.install_options == ["yo1", "yo2"]
+        assert req.config_settings == {"yo3": "yo4", "yo1": "yo2"}
 
     def test_hash_options(self, line_processor: LineProcessor) -> None:
         """Test the --hash option: mostly its value storage.