feat: support activation job namespace override via env var

Read EDA_ACTIVATION_JOB_NAMESPACE environment variable in
_set_namespace() as an override before falling back to the
ServiceAccount token namespace file.  This allows the eda-server-operator
to direct activation job pods into a separate Kubernetes namespace for
security isolation, resource quotas, and NetworkPolicy boundaries.

Changes:
- _set_namespace() checks EDA_ACTIVATION_JOB_NAMESPACE first
- Unit tests for override, fallback, whitespace handling, and error case

Companion operator PR: ansible/eda-server-operator#345

Signed-off-by: Alexey Masolov <[email protected]>
Co-authored-by: Cursor <[email protected]>

Author: amasolov

src/aap_eda/services/activation/engine/kubernetes.py

@@ -15,6 +15,7 @@
 import base64
 import json
 import logging
+import os
 from dataclasses import dataclass
 from datetime import datetime, timezone
 
@@ -566,6 +567,15 @@ def _wait_for_pod_to_start(self, log_handler: LogHandler) -> None:
             watcher.stop()
 
     def _set_namespace(self) -> None:
+        ns_override = os.environ.get("EDA_ACTIVATION_JOB_NAMESPACE", "")
+        if ns_override.strip():
+            self.namespace = ns_override.strip()
+            LOGGER.info(
+                "Using activation job namespace override: %s",
+                self.namespace,
+            )
+            return
+
         namespace_file = (
             "/var/run/secrets/kubernetes.io/serviceaccount/namespace"
         )

tests/unit/test_activation_job_namespace.py

@@ -0,0 +1,96 @@
+#  Copyright 2026 Red Hat, Inc.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+import os
+from unittest import mock
+
+import pytest
+
+from aap_eda.services.activation.engine.exceptions import (
+    ContainerEngineInitError,
+)
+from aap_eda.services.activation.engine.kubernetes import Engine
+
+
+@mock.patch.dict("os.environ", {"EDA_ACTIVATION_JOB_NAMESPACE": "eda-jobs"})
+def test_set_namespace_env_override():
+    engine = Engine(
+        activation_id="1",
+        resource_prefix="activation",
+        client=mock.Mock(),
+    )
+    assert engine.namespace == "eda-jobs"
+
+
+@mock.patch.dict(
+    "os.environ", {"EDA_ACTIVATION_JOB_NAMESPACE": "  eda-jobs  "}
+)
+def test_set_namespace_env_override_strips_whitespace():
+    engine = Engine(
+        activation_id="1",
+        resource_prefix="activation",
+        client=mock.Mock(),
+    )
+    assert engine.namespace == "eda-jobs"
+
+
+@mock.patch.dict("os.environ", {"EDA_ACTIVATION_JOB_NAMESPACE": ""})
+def test_set_namespace_empty_env_falls_back_to_file():
+    with mock.patch("builtins.open", mock.mock_open(read_data="aap-eda")):
+        engine = Engine(
+            activation_id="1",
+            resource_prefix="activation",
+            client=mock.Mock(),
+        )
+        assert engine.namespace == "aap-eda"
+
+
+def test_set_namespace_unset_env_falls_back_to_file():
+    env = {
+        k: v
+        for k, v in os.environ.items()
+        if k != "EDA_ACTIVATION_JOB_NAMESPACE"
+    }
+    with mock.patch.dict("os.environ", env, clear=True):
+        with mock.patch(
+            "builtins.open",
+            mock.mock_open(read_data="my-namespace"),
+        ):
+            engine = Engine(
+                activation_id="1",
+                resource_prefix="activation",
+                client=mock.Mock(),
+            )
+            assert engine.namespace == "my-namespace"
+
+
+@mock.patch.dict("os.environ", {"EDA_ACTIVATION_JOB_NAMESPACE": "   "})
+def test_set_namespace_whitespace_only_env_falls_back_to_file():
+    with mock.patch("builtins.open", mock.mock_open(read_data="aap-eda")):
+        engine = Engine(
+            activation_id="1",
+            resource_prefix="activation",
+            client=mock.Mock(),
+        )
+        assert engine.namespace == "aap-eda"
+
+
+def test_set_namespace_no_env_no_file_raises():
+    with mock.patch.dict("os.environ", {}, clear=True):
+        with pytest.raises(ContainerEngineInitError):
+            Engine(
+                activation_id="1",
+                resource_prefix="activation",
+                client=mock.Mock(),
+            )