fix(env): isolated env must validate requirements

src/poetry/utils/isolated_build.py

@@ -124,10 +124,17 @@ def install(self, requirements: Collection[str]) -> None:
         # We build Poetry dependencies from the requirements
         package = ProjectPackage("__root__", "0.0.0")
         package.python_versions = ".".join(str(v) for v in self._env.version_info[:3])
+        env_markers = self._env.get_marker_env()
 
         for requirement in requirements:
             dependency = Dependency.create_from_pep_508(requirement)
-            package.add_dependency(dependency)
+
+            if dependency.marker.is_empty() or dependency.marker.validate(env_markers):
+                # we ignore dependencies that are not valid for this environment
+                # this ensures that we do not end up with unnecessary constraint
+                # errors when solving build system requirements; this is assumed
+                # safe as this environment is ephemeral
+                package.add_dependency(dependency)
 
         io = BufferedIO()
 

tests/inspection/test_info.py

@@ -329,7 +329,8 @@ def test_info_no_setup_pkg_info_no_deps_dynamic(fixture_dir: FixtureDirGetter) -
 def test_info_setup_simple(mocker: MockerFixture, demo_setup: Path) -> None:
     spy = mocker.spy(VirtualEnv, "run")
     info = PackageInfo.from_directory(demo_setup)
-    assert spy.call_count == 4
+
+    assert spy.call_count == 6
     demo_check_info(info, requires_dist={"package"})
 
 

tests/utils/test_isolated_build.py

@@ -2,6 +2,7 @@
 
 import shutil
 import sys
+import uuid
 
 from pathlib import Path
 from typing import TYPE_CHECKING
@@ -56,6 +57,38 @@ def test_isolated_env_install_success(pool: RepositoryPool) -> None:
         )
 
 
+def test_isolated_env_install_discards_requirements_not_needed_by_env(
+    pool: RepositoryPool,
+) -> None:
+    with ephemeral_environment(Path(sys.executable)) as venv:
+        env = IsolatedEnv(venv, pool)
+        assert not InstalledRepository.load(venv).find_packages(
+            get_dependency("poetry-core")
+        )
+
+        venv_python_version = venv.get_marker_env().get("python_version")
+        package_one = uuid.uuid4().hex
+        package_two = uuid.uuid4().hex
+
+        env.install(
+            {
+                f"poetry-core; python_version=='{venv_python_version}'",
+                f"{package_one}>=1.0.0; python_version=='0.0'",
+                f"{package_two}>=2.0.0; platform_system=='Mirrors'",
+            }
+        )
+        assert InstalledRepository.load(venv).find_packages(
+            get_dependency("poetry-core")
+        )
+        assert not InstalledRepository.load(venv).find_packages(
+            get_dependency(package_one)
+        )
+
+        assert not InstalledRepository.load(venv).find_packages(
+            get_dependency(package_two)
+        )
+
+
 @pytest.mark.parametrize(
     ("requirements", "exception"),
     [