feat: support passenv

cibuildwheel/environment.py

@@ -84,6 +84,9 @@ def as_dictionary(
 
         return environment
 
+    def add(self, name: str, value: str) -> None:
+        self.assignments.append(EnvironmentAssignment(f'{name}="{value}"'))
+
     def as_shell_commands(self) -> List[str]:
         return [a.as_shell_assignment() for a in self.assignments]
 

cibuildwheel/options.py

@@ -408,6 +408,7 @@ def build_options(self, identifier: Optional[str]) -> BuildOptions:
             environment_config = self.reader.get(
                 "environment", table={"item": '{k}="{v}"', "sep": " "}
             )
+            passenv = self.reader.get("passenv", sep=",").split(",")
             before_build = self.reader.get("before-build", sep=" && ")
             repair_command = self.reader.get("repair-wheel-command", sep=" && ")
 
@@ -438,6 +439,14 @@ def build_options(self, identifier: Optional[str]) -> BuildOptions:
                 traceback.print_exc(None, sys.stderr)
                 sys.exit(2)
 
+            # Pass through environment variables
+            if self.platform == "linux":
+                for passedenv in passenv:
+                    try:
+                        environment.add(passedenv, os.environ[passedenv])
+                    except KeyError:
+                        pass
+
             if dependency_versions == "pinned":
                 dependency_constraints: Optional[
                     DependencyConstraints

cibuildwheel/resources/defaults.toml

@@ -7,6 +7,7 @@ archs = ["auto"]
 build-frontend = "pip"
 dependency-versions = "pinned"
 environment = {}
+passenv = []
 build-verbosity = ""
 
 before-all = ""

unit_test/options_test.py

@@ -15,6 +15,8 @@
 
 manylinux-x86_64-image = "manylinux1"
 
+passenv = ["EXAMPLE_ENV"]
+
 [tool.cibuildwheel.macos]
 test-requires = "else"
 
@@ -66,3 +68,21 @@ def test_options_1(tmp_path, monkeypatch):
     assert local.manylinux_images is not None
     assert local.test_command == "pyproject-override"
     assert local.manylinux_images["x86_64"] == pinned_x86_64_docker_image["manylinux2014"]
+
+
+def test_passthrough(tmp_path, monkeypatch):
+
+    with tmp_path.joinpath("pyproject.toml").open("w") as f:
+        f.write(PYPROJECT_1)
+
+    args = get_default_command_line_arguments()
+    args.package_dir = str(tmp_path)
+
+    monkeypatch.setattr(platform_module, "machine", lambda: "x86_64")
+    monkeypatch.setenv("EXAMPLE_ENV", "ONE")
+
+    options = Options(platform="linux", command_line_arguments=args)
+
+    default_build_options = options.build_options(identifier=None)
+
+    assert default_build_options.environment == parse_environment('FOO="BAR" EXAMPLE_ENV="ONE"')