Add udev DH e2e tests (#637)

This commit introduces a new testsuite that ensures the udev Discover
Handler is able to discover a basic device, and a grouped device (if
any available).

Signed-off-by: Nicolas Belouin <nicolas.belouin@suse.com>

test/e2e/helpers.py

@@ -1,3 +1,5 @@
+import time
+
 import kubernetes
 from pathlib import Path
 
@@ -117,17 +119,26 @@ def assert_akri_instances_present(
 ):
     version = f'v{akri_version.split(".")[0]}'
     v1_custom = kubernetes.client.CustomObjectsApi()
-    instances = v1_custom.list_namespaced_custom_object(
-        "akri.sh", version, "default", "instances"
-    )
-    resource_version = instances["metadata"]["resourceVersion"]
-    instances = {
-        instance["metadata"]["name"]
-        for instance in instances["items"]
-        if instance["spec"]["configurationName"] == config_name
-    }
+
+    def get_instances():
+        instances = v1_custom.list_namespaced_custom_object(
+            "akri.sh", version, "default", "instances"
+        )
+        resource_version = instances["metadata"]["resourceVersion"]
+        instances = {
+            instance["metadata"]["name"]
+            for instance in instances["items"]
+            if instance["spec"]["configurationName"] == config_name
+        }
+        return instances, resource_version
+
+    instances, resource_version = get_instances()
     if len(instances) == count:
-        return
+        # Check it is not a transient state
+        time.sleep(1)
+        instances, resource_version = get_instances()
+        if len(instances) == count:
+            return
     w = kubernetes.watch.Watch()
     for e in w.stream(
         v1_custom.list_namespaced_custom_object,
@@ -145,6 +156,10 @@ def assert_akri_instances_present(
         else:
             instances.add(e["raw_object"]["metadata"]["name"])
         if len(instances) == count:
-            w.stop()
-            return
+            # Check it is not a transient state
+            time.sleep(1)
+            instances, _ = get_instances()
+            if len(instances) == count:
+                w.stop()
+                return
     raise AssertionError(f"{count} != {len(instances)}")

test/e2e/test_udev.py

@@ -0,0 +1,86 @@
+from pathlib import Path
+import time
+
+import yaml
+import pytest
+import kubernetes
+from helpers import assert_akri_instances_present, check_akri_is_healthy
+
+
+discovery_handlers = ["udev"]
+
+
+@pytest.fixture
+def dev_null_config(akri_version):
+    with open(Path(__file__).parent / "yaml/udevDevNullConfiguration.yaml") as f:
+        body = yaml.safe_load(f)
+    client = kubernetes.client.CustomObjectsApi()
+    version = f'v{akri_version.split(".")[0]}'
+    client.create_namespaced_custom_object(
+        "akri.sh", version, "default", "configurations", body
+    )
+
+    yield body["metadata"]["name"]
+
+    client.delete_namespaced_custom_object(
+        "akri.sh", version, "default", "configurations", body["metadata"]["name"]
+    )
+
+
+def test_dev_null_config(akri_version, dev_null_config):
+    check_akri_is_healthy(discovery_handlers)
+    assert_akri_instances_present(akri_version, dev_null_config, 1)
+
+
+@pytest.fixture
+def grouped_config(akri_version):
+    v1_core = kubernetes.client.CoreV1Api()
+    pods = v1_core.list_namespaced_pod(
+        "default",
+        label_selector=f"app.kubernetes.io/name=akri-udev-discovery",
+        field_selector="status.phase=Running",
+    ).items
+    base_command = ["/bin/sh", "-c"]
+    # This command will get the ID_PATH to use to get a device with many "subdevices"
+    command = "grep -hr ID_PATH= /run/udev/data | sort | uniq -cd | sort -h | tail -1 | cut -d '=' -f 2"
+    paths = set()
+    # Get the ID_PATH we can use
+    for pod in pods:
+        resp = kubernetes.stream.stream(
+            v1_core.connect_get_namespaced_pod_exec,
+            pod.metadata.name,
+            "default",
+            command=base_command + [command],
+            stdout=True,
+            stdin=False,
+            stderr=True,
+            tty=False,
+            _preload_content=False,
+        )
+        try:
+            paths.add(resp.readline_stdout(timeout=3).strip())
+        except:
+            pytest.skip("No udev ?")
+    if len(paths) == 0:
+        pytest.skip("No groupable devices found")
+    path = paths.pop()
+
+    with open(Path(__file__).parent / "yaml/udevGroupedConfiguration.yaml") as f:
+        body = yaml.safe_load(f)
+    body["spec"]["discoveryHandler"]["discoveryDetails"] = body["spec"][
+        "discoveryHandler"
+    ]["discoveryDetails"].format(path)
+    client = kubernetes.client.CustomObjectsApi()
+    version = f'v{akri_version.split(".")[0]}'
+    client.create_namespaced_custom_object(
+        "akri.sh", version, "default", "configurations", body
+    )
+    yield body["metadata"]["name"]
+    client.delete_namespaced_custom_object(
+        "akri.sh", version, "default", "configurations", body["metadata"]["name"]
+    )
+
+
+def test_grouped_config(akri_version, grouped_config):
+    check_akri_is_healthy(discovery_handlers)
+    assert_akri_instances_present(akri_version, grouped_config, 1)

test/e2e/yaml/udevDevNullConfiguration.yaml

@@ -0,0 +1,10 @@
+apiVersion: akri.sh/v0
+kind: Configuration
+metadata:
+  name: akri-udev-dev-null
+spec:
+  discoveryHandler: 
+    name: udev
+    discoveryDetails: |+
+      udevRules:
+        - KERNEL=="null"

test/e2e/yaml/udevGroupedConfiguration.yaml

@@ -0,0 +1,11 @@
+apiVersion: akri.sh/v0
+kind: Configuration
+metadata:
+  name: akri-udev-grouped
+spec:
+  discoveryHandler: 
+    name: udev
+    discoveryDetails: |+
+      groupRecursive: true
+      udevRules:
+        - ENV{{ID_PATH}}=="{}"