Stop propagating config_settings to dependencies

docs/html/reference/build-system/pyproject-toml.md

@@ -116,6 +116,12 @@ multiple times, in order to specify multiple settings).
 
 The supplied configuration settings are passed to every backend hook call.
 
+Configuration settings provided via `--config-settings` command line options (or the
+equivalent environment variables or configuration file entries) are passed to the build
+of requirements explicitly provided as pip command line arguments. They are not passed
+to the build of dependencies, or to the build of requirements provided in requirement
+files.
+
 ## Build output
 
 It is the responsibility of the build backend to ensure that the output is

news/11941.feature.rst

@@ -0,0 +1,4 @@
+Stop propagating CLI ``--config-settings`` to the build dependencies. They already did
+not propagate to requirements provided in requirement files. To pass the same config
+settings to several requirements, users should provide the requirements as CLI
+arguments.

src/pip/_internal/cli/req_command.py

@@ -344,7 +344,6 @@ def make_resolver(
             install_req_from_req_string,
             isolated=options.isolated_mode,
             use_pep517=use_pep517,
-            config_settings=getattr(options, "config_settings", None),
         )
         resolver_variant = cls.determine_resolver_variant(options)
         # The long import name and duplicated invocation is needed to convince

src/pip/_internal/req/constructors.py

@@ -416,7 +416,6 @@ def install_req_from_req_string(
     isolated: bool = False,
     use_pep517: Optional[bool] = None,
     user_supplied: bool = False,
-    config_settings: Optional[Dict[str, Union[str, List[str]]]] = None,
 ) -> InstallRequirement:
     try:
         req = get_requirement(req_string)
@@ -446,7 +445,6 @@ def install_req_from_req_string(
         isolated=isolated,
         use_pep517=use_pep517,
         user_supplied=user_supplied,
-        config_settings=config_settings,
     )
 
 

tests/functional/test_config_settings.py

@@ -1,8 +1,10 @@
 import json
+import tarfile
 from pathlib import Path
-from typing import Tuple
+from typing import List, Optional, Tuple
 from zipfile import ZipFile
 
+from pip._internal.utils.urls import path_to_url
 from tests.lib import PipTestEnvironment
 
 PYPROJECT_TOML = """\
@@ -36,9 +38,10 @@
 Author: None
 Author-email: [email protected]
 License: MIT
+{requires_dist}
 """
 
-def make_wheel(z, project, version, files):
+def make_wheel(z, project, version, requires_dist, files):
     record = []
     def add_file(name, data):
         data = data.encode("utf-8")
@@ -48,7 +51,9 @@ def add_file(name, data):
         record.append((name, f"sha256={hash}", len(data)))
     distinfo = f"{project}-{version}.dist-info"
     add_file(f"{distinfo}/WHEEL", WHEEL)
-    add_file(f"{distinfo}/METADATA", METADATA.format(project=project, version=version))
+    add_file(f"{distinfo}/METADATA", METADATA.format(
+        project=project, version=version, requires_dist=requires_dist
+    ))
     for name, data in files:
         add_file(name, data)
     record_name = f"{distinfo}/RECORD"
@@ -70,29 +75,35 @@ def build_wheel(
     ):
         if config_settings is None:
             config_settings = {}
-        w = os.path.join(wheel_directory, "foo-1.0-py3-none-any.whl")
+        w = os.path.join(wheel_directory, "{{name}}-1.0-py3-none-any.whl")
         with open(w, "wb") as f:
             with ZipFile(f, "w") as z:
                 make_wheel(
-                    z, "foo", "1.0",
-                    [("config.json", json.dumps(config_settings))]
+                    z, "{{name}}", "1.0", "{{requires_dist}}",
+                    [("{{name}}-config.json", json.dumps(config_settings))]
                 )
-        return "foo-1.0-py3-none-any.whl"
+        return "{{name}}-1.0-py3-none-any.whl"
 
     build_editable = build_wheel
 
 main = Backend()
 '''
 
 
-def make_project(path: Path) -> Tuple[str, str, Path]:
-    name = "foo"
+def make_project(
+    path: Path, name: str = "foo", dependencies: Optional[List[str]] = None
+) -> Tuple[str, str, Path]:
     version = "1.0"
     project_dir = path / name
     backend = project_dir / "backend"
     backend.mkdir(parents=True)
     (project_dir / "pyproject.toml").write_text(PYPROJECT_TOML)
-    (backend / "dummy_backend.py").write_text(BACKEND_SRC)
+    requires_dist = [f"Requires-Dist: {dep}" for dep in dependencies or []]
+    (backend / "dummy_backend.py").write_text(
+        BACKEND_SRC.replace("{{name}}", name).replace(
+            "{{requires_dist}}", "\n".join(requires_dist)
+        )
+    )
     return name, version, project_dir
 
 
@@ -108,32 +119,140 @@ def test_backend_sees_config(script: PipTestEnvironment) -> None:
     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")
+            output = z.read(f"{name}-config.json")
+            assert json.loads(output) == {"FOO": "Hello"}
+
+
+def test_backend_sees_config_via_constraint(script: PipTestEnvironment) -> None:
+    name, version, project_dir = make_project(script.scratch_path)
+    constraints_file = script.scratch_path / "constraints.txt"
+    constraints_file.write_text(f"{name} @ {path_to_url(str(project_dir))}")
+    script.pip(
+        "wheel",
+        "--config-settings",
+        "FOO=Hello",
+        "-c",
+        "constraints.txt",
+        name,
+    )
+    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(f"{name}-config.json")
+            assert json.loads(output) == {"FOO": "Hello"}
+
+
+def test_backend_sees_config_via_sdist(script: PipTestEnvironment) -> None:
+    name, version, project_dir = make_project(script.scratch_path)
+    dists_dir = script.scratch_path / "dists"
+    dists_dir.mkdir()
+    with tarfile.open(dists_dir / f"{name}-{version}.tar.gz", "w:gz") as dist_tar:
+        dist_tar.add(project_dir, arcname=name)
+    script.pip(
+        "wheel",
+        "--config-settings",
+        "FOO=Hello",
+        "-f",
+        dists_dir,
+        name,
+    )
+    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(f"{name}-config.json")
             assert json.loads(output) == {"FOO": "Hello"}
 
 
+def test_req_file_does_not_see_config(script: PipTestEnvironment) -> None:
+    """Test that CLI config settings do not propagate to requirement files."""
+    name, _, project_dir = make_project(script.scratch_path)
+    reqs_file = script.scratch_path / "reqs.txt"
+    reqs_file.write_text(f"{project_dir}")
+    script.pip(
+        "install",
+        "--config-settings",
+        "FOO=Hello",
+        "-r",
+        reqs_file,
+    )
+    config = script.site_packages_path / f"{name}-config.json"
+    with open(config, "rb") as f:
+        assert json.load(f) == {}
+
+
+def test_dep_does_not_see_config(script: PipTestEnvironment) -> None:
+    """Test that CLI config settings do not propagate to dependencies."""
+    _, _, bar_project_dir = make_project(script.scratch_path, name="bar")
+    _, _, foo_project_dir = make_project(
+        script.scratch_path,
+        name="foo",
+        dependencies=[f"bar @ {path_to_url(str(bar_project_dir))}"],
+    )
+    script.pip(
+        "install",
+        "--config-settings",
+        "FOO=Hello",
+        foo_project_dir,
+    )
+    foo_config = script.site_packages_path / "foo-config.json"
+    with open(foo_config, "rb") as f:
+        assert json.load(f) == {"FOO": "Hello"}
+    bar_config = script.site_packages_path / "bar-config.json"
+    with open(bar_config, "rb") as f:
+        assert json.load(f) == {}
+
+
+def test_dep_in_req_file_does_not_see_config(script: PipTestEnvironment) -> None:
+    """Test that CLI config settings do not propagate to dependencies found in
+    requirement files."""
+    _, _, bar_project_dir = make_project(script.scratch_path, name="bar")
+    _, _, foo_project_dir = make_project(
+        script.scratch_path,
+        name="foo",
+        dependencies=["bar"],
+    )
+    reqs_file = script.scratch_path / "reqs.txt"
+    reqs_file.write_text(f"bar @ {path_to_url(str(bar_project_dir))}")
+    script.pip(
+        "install",
+        "--config-settings",
+        "FOO=Hello",
+        "-r",
+        reqs_file,
+        foo_project_dir,
+    )
+    foo_config = script.site_packages_path / "foo-config.json"
+    with open(foo_config, "rb") as f:
+        assert json.load(f) == {"FOO": "Hello"}
+    bar_config = script.site_packages_path / "bar-config.json"
+    with open(bar_config, "rb") as f:
+        assert json.load(f) == {}
+
+
 def test_install_sees_config(script: PipTestEnvironment) -> None:
-    _, _, project_dir = make_project(script.scratch_path)
+    name, _, project_dir = make_project(script.scratch_path)
     script.pip(
         "install",
         "--config-settings",
         "FOO=Hello",
         project_dir,
     )
-    config = script.site_packages_path / "config.json"
+    config = script.site_packages_path / f"{name}-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)
+    name, _, project_dir = make_project(script.scratch_path)
     script.pip(
         "install",
         "--config-settings",
         "FOO=Hello",
         "--editable",
         project_dir,
     )
-    config = script.site_packages_path / "config.json"
+    config = script.site_packages_path / f"{name}-config.json"
     with open(config, "rb") as f:
         assert json.load(f) == {"FOO": "Hello"}