Fix HOME setting for OpenMPI 5 in the Khiops process environment

CHANGELOG.md

@@ -6,6 +6,12 @@
   - Example: 10.2.1.4 is the 5th version that supports khiops 10.2.1.
 - Internals: Changes in *Internals* sections are unlikely to be of interest for data scientists.
 
+## Unreleased
+
+### Fixed
+- (General) Automatic Credentials Discovery-based credential retrieval for
+  Google cloud storage (GCS).
+
 ## 11.0.0.0 - 2025-12-19
 
 ### Added

khiops/core/internals/runner.py

@@ -337,9 +337,8 @@ def _build_khiops_process_environment():
 
     # Ensure HOME is always set for OpenMPI 5+
     # (using KHIOPS_MPI_HOME if it exists)
-    khiops_env["HOME"] = os.path.pathsep.join(
-        [khiops_env.get("KHIOPS_MPI_HOME", ""), khiops_env.get("HOME", "")]
-    )
+    if "HOME" not in khiops_env:
+        khiops_env["HOME"] = khiops_env.get("KHIOPS_MPI_HOME", "")
     return khiops_env
 
 

tests/test_khiops_integrations.py

@@ -291,6 +291,9 @@ def test_runner_environment_for_openmpi5(self):
         """Test if KHIOPS_MPI_HOME is actually exported
         and HOME is corrected for OpenMPI 5+"""
 
+        # Store initial HOME, then delete it from the environment
+        initial_home = os.environ.pop("HOME", "")
+
         # Trigger the environment initialization
         _ = kh.get_runner().khiops_version
 
@@ -300,13 +303,16 @@ def test_runner_environment_for_openmpi5(self):
         self.assertIsNotNone(os.environ.get("KHIOPS_MPI_HOME"))
 
         # Check HOME is corrected in the new process environment
+        self.assertIn("HOME", khiops_env)
         self.assertEqual(
-            os.path.pathsep.join(
-                [khiops_env.get("KHIOPS_MPI_HOME", ""), os.environ.get("HOME", "")]
-            ),
-            khiops_env.get("HOME"),
+            khiops_env["KHIOPS_MPI_HOME"],
+            khiops_env["HOME"],
         )
 
+        # Restore initial HOME in the environment
+        if initial_home:
+            os.environ["HOME"] = initial_home
+
     def test_runner_environment_initialization(self):
         """Test that local runner initializes/ed its environment properly