Merge pull request #411 from YannickJadoul/fix-docker-commandsubstitution

Fix command substitution in CIBW_ENVIRONMENT in Linux docker images

cibuildwheel/docker_container.py

@@ -182,7 +182,7 @@ class DockerContainer:
 
     def environment_executor(self, command: List[str], environment: Dict[str, str]) -> str:
         # used as an EnvironmentExecutor to evaluate commands and capture output
-        return self.call(command, env=environment)
+        return self.call(command, env=environment, capture_output=True)
 
 
 def shell_quote(path: PurePath) -> str:

test/test_environment.py

@@ -13,12 +13,15 @@ project_with_environment_asserts = test_projects.new_c_project(
         # explode if environment isn't correct, as set in CIBW_ENVIRONMENT
         CIBW_TEST_VAR = os.environ.get("CIBW_TEST_VAR")
         CIBW_TEST_VAR_2 = os.environ.get("CIBW_TEST_VAR_2")
+        CIBW_TEST_VAR_3 = os.environ.get("CIBW_TEST_VAR_3")
         PATH = os.environ.get("PATH")
 
         if CIBW_TEST_VAR != "a b c":
             raise Exception('CIBW_TEST_VAR should equal "a b c". It was "%s"' % CIBW_TEST_VAR)
         if CIBW_TEST_VAR_2 != "1":
             raise Exception('CIBW_TEST_VAR_2 should equal "1". It was "%s"' % CIBW_TEST_VAR_2)
+        if CIBW_TEST_VAR_3 != "test string 3":
+            raise Exception('CIBW_TEST_VAR_3 should equal "test string 3". It was "%s"' % CIBW_TEST_VAR_3)
         if "/opt/cibw_test_path" not in PATH:
             raise Exception('PATH should contain "/opt/cibw_test_path". It was "%s"' % PATH)
         if "$PATH" in PATH:

unit_test/docker_container_test.py

@@ -8,6 +8,7 @@ from pathlib import Path, PurePath
 import pytest
 
 from cibuildwheel.docker_container import DockerContainer
+from cibuildwheel.environment import EnvironmentAssignment
 
 # for these tests we use manylinux2014 images, because they're available on
 # multi architectures and include python3.8
@@ -145,3 +146,10 @@ def test_dir_operations(tmp_path: Path):
         container.copy_out(dst_dir, new_test_dir)
 
         assert test_binary_data == (new_test_dir / 'test.dat').read_bytes()
+
+
+@pytest.mark.docker
+def test_environment_executor():
+    with DockerContainer(DEFAULT_IMAGE) as container:
+        assignment = EnvironmentAssignment("TEST=$(echo 42)")
+        assert assignment.evaluated_value({}, container.environment_executor) == "42"