inspection: fix PATH when building a dependency to fetch metadata

src/poetry/inspection/info.py

@@ -44,10 +44,8 @@
 dest = '{dest}'
 
 with build.env.DefaultIsolatedEnv() as env:
-    builder = build.ProjectBuilder(
-        source_dir=source,
-        python_executable=env.python_executable,
-        runner=pyproject_hooks.quiet_subprocess_runner,
+    builder = build.ProjectBuilder.from_isolated_env(
+        env, source, runner=pyproject_hooks.quiet_subprocess_runner
     )
     env.install(builder.build_system_requires)
     env.install(builder.get_requires_for_build('wheel'))

tests/inspection/test_info.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+import shutil
+
 from subprocess import CalledProcessError
 from typing import TYPE_CHECKING
 
@@ -87,6 +89,33 @@ def demo_setup_complex_pep517_legacy(demo_setup_complex: Path) -> Path:
     return demo_setup_complex
 
 
+@pytest.fixture
+def demo_setup_complex_calls_script(
+    fixture_dir: FixtureDirGetter, source_dir: Path, tmp_path: Path
+) -> Path:
+    # make sure the scripts project is on the same drive (for Windows tests in CI)
+    scripts_dir = tmp_path / "scripts"
+    shutil.copytree(fixture_dir("scripts"), scripts_dir)
+
+    pyproject = source_dir / "pyproject.toml"
+    pyproject.write_text(f"""\
+    [build-system]
+    requires = ["setuptools", "scripts @ {scripts_dir.as_uri()}"]
+    build-backend = "setuptools.build_meta:__legacy__"
+""")
+
+    setup_py = source_dir / "setup.py"
+    setup_py.write_text("""\
+import subprocess
+from setuptools import setup
+if subprocess.call(["exit-code"]) != 42:
+    raise RuntimeError("Wrong exit code.")
+setup(name="demo", version="0.1.0", install_requires=[i for i in ["package"]])
+""")
+
+    return source_dir
+
+
 def demo_check_info(info: PackageInfo, requires_dist: set[str] | None = None) -> None:
     assert info.name == "demo"
     assert info.version == "0.1.0"
@@ -245,6 +274,13 @@ def test_info_setup_complex_disable_build(
     assert info.requires_dist is None
 
 
+@pytest.mark.network
+def test_info_setup_complex_calls_script(demo_setup_complex_calls_script: Path) -> None:
+    """Building the project requires calling a script from its build_requires."""
+    info = PackageInfo.from_directory(demo_setup_complex_calls_script)
+    demo_check_info(info, requires_dist={"package"})
+
+
 @pytest.mark.network
 @pytest.mark.parametrize("missing", ["version", "name", "install_requires"])
 def test_info_setup_missing_mandatory_should_trigger_pep517(