Strip attributes in List resources

flux_local/tool/visitor.py

@@ -177,6 +177,23 @@ def update_manifest(self, manifest: Manifest) -> None:
                         helm_release.images.sort()
 
 
+def strip_resource_attributes(resource: dict[str, Any], strip_attributes: list[str]) -> None:
+    """Strip any annotations from kustomize that contribute to diff noise when objects are re-ordered in the output."""
+    strip_attrs(resource["metadata"], strip_attributes)
+    # Remove common noisy labels in commonly used templates
+    if (
+        (spec := resource.get("spec"))
+        and (templ := spec.get("template"))
+        and (meta := templ.get("metadata"))
+    ):
+        strip_attrs(meta, strip_attributes)
+    if resource["kind"] == "List" and (items := resource.get("items")) and isinstance(items, list):
+        for item in items:
+            if not (item_meta := item.get("metadata")):
+                continue
+            strip_attrs(item_meta, strip_attributes)
+
+
 class ObjectOutput(ResourceOutput):
     """Resource visitor that builds outputs for objects within the kustomization."""
 
@@ -208,14 +225,8 @@ async def call_async(
                     )
                     continue
                 # Remove common noisy labels
-                strip_attrs(metadata, self.strip_attributes)
-                # Remove common noisy labels in commonly used templates
-                if (
-                    (spec := resource.get("spec"))
-                    and (templ := spec.get("template"))
-                    and (meta := templ.get("metadata"))
-                ):
-                    strip_attrs(meta, self.strip_attributes)
+                strip_resource_attributes(resource, self.strip_attributes)
+
                 resource_key = ResourceKey(
                     kind=kind,
                     kustomization_path=str(kustomization_path),

tests/tool/test_visitor.py

@@ -0,0 +1,250 @@
+"""Tests for the visitor module."""
+
+from typing import Any
+import yaml
+
+import pytest
+
+
+from flux_local.tool.visitor import strip_resource_attributes
+
+STRIP_ATTRIBUTES = [
+    "app.kubernetes.io/version",
+    "chart",
+]
+
+
+@pytest.mark.parametrize(
+    ("metadata", "expected_metadata"),
+    [
+        (
+            {
+                "labels": {
+                    "app.kubernetes.io/version": "1.0.0",
+                    "app.kubernetes.io/managed-by": "Helm",
+                }
+            },
+            {
+                "labels": {
+                    "app.kubernetes.io/managed-by": "Helm",
+                },
+            },
+        ),
+        (
+            {
+                "annotations": {
+                    "app.kubernetes.io/version": "1.0.0",
+                    "app.kubernetes.io/managed-by": "Helm",
+                }
+            },
+            {
+                "annotations": {
+                    "app.kubernetes.io/managed-by": "Helm",
+                },
+            },
+        ),
+        (
+            {},
+            {},
+        ),
+    ],
+)
+def test_strip_resource_attributes(
+    metadata: dict[str, Any], expected_metadata: dict[str, Any]
+) -> None:
+    """Test the strip_resource_attributes function."""
+    resource = {
+        "apiVersion": "v1",
+        "kind": "ConfigMap",
+        "metadata": {
+            "name": "my-configmap",
+            "namespace": "default",
+            **metadata,
+        },
+        "data": {
+            "key1": "value1",
+            "key2": "value2",
+        },
+    }
+    strip_resource_attributes(resource, STRIP_ATTRIBUTES)
+    assert resource == {
+        "apiVersion": "v1",
+        "kind": "ConfigMap",
+        "metadata": {
+            "name": "my-configmap",
+            "namespace": "default",
+            **expected_metadata,
+        },
+        "data": {
+            "key1": "value1",
+            "key2": "value2",
+        },
+    }
+
+
+def test_strip_deployment_metadata() -> None:
+    """Test the strip_resource_attributes function."""
+    resource = yaml.load(
+        """apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  labels:
+    app: nginx
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+        app.kubernetes.io/version: 1.0.0
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:1.14.2
+        ports:
+        - containerPort: 80
+""",
+        Loader=yaml.Loader,
+    )
+
+    strip_resource_attributes(resource, STRIP_ATTRIBUTES)
+    assert (
+        yaml.dump(resource, sort_keys=False)
+        == """apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  labels:
+    app: nginx
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:1.14.2
+        ports:
+        - containerPort: 80
+"""
+    )
+
+
+def test_strip_list_metadata() -> None:
+    """Test the stripping metadata from a list resource."""
+    resource = yaml.load(
+        """apiVersion: v1
+items:
+- apiVersion: stable.example.com/v1
+  kind: CronTab
+  metadata:
+    annotations:
+      app: my-cron-tab
+      app.kubernetes.io/version: 1.0.0
+    creationTimestamp: '2021-06-20T07:35:27Z'
+    generation: 1
+    name: my-new-cron-object
+    namespace: default
+    resourceVersion: '1326'
+    uid: 9aab1d66-628e-41bb-a422-57b8b3b1f5a9
+  spec:
+    cronSpec: '* * * * */5'
+    image: my-awesome-cron-image
+kind: List
+metadata:
+  resourceVersion: ''
+  selfLink: ''
+
+""",
+        Loader=yaml.Loader,
+    )
+
+    strip_resource_attributes(resource, STRIP_ATTRIBUTES)
+    assert (
+        yaml.dump(resource, sort_keys=False)
+        == """apiVersion: v1
+items:
+- apiVersion: stable.example.com/v1
+  kind: CronTab
+  metadata:
+    annotations:
+      app: my-cron-tab
+    creationTimestamp: '2021-06-20T07:35:27Z'
+    generation: 1
+    name: my-new-cron-object
+    namespace: default
+    resourceVersion: '1326'
+    uid: 9aab1d66-628e-41bb-a422-57b8b3b1f5a9
+  spec:
+    cronSpec: '* * * * */5'
+    image: my-awesome-cron-image
+kind: List
+metadata:
+  resourceVersion: ''
+  selfLink: ''
+"""
+    )
+
+
+def test_strip_list_null_items() -> None:
+    """Test corner cases of handling metadata."""
+    resource = yaml.load(
+        """apiVersion: v1
+kind: List
+metadata:
+  resourceVersion: ''
+  selfLink: ''
+items:
+
+""",
+        Loader=yaml.Loader,
+    )
+
+    strip_resource_attributes(resource, STRIP_ATTRIBUTES)
+    assert (
+        yaml.dump(resource, sort_keys=False)
+        == """apiVersion: v1
+kind: List
+metadata:
+  resourceVersion: ''
+  selfLink: ''
+items: null
+"""
+    )
+
+
+def test_strip_list_item_without_metdata() -> None:
+    """Test corner cases of handling metadata."""
+    resource = yaml.load(
+        """apiVersion: v1
+kind: List
+metadata:
+  resourceVersion: ''
+  selfLink: ''
+items:
+- kind: CronTab
+""",
+        Loader=yaml.Loader,
+    )
+
+    strip_resource_attributes(resource, STRIP_ATTRIBUTES)
+    assert (
+        yaml.dump(resource, sort_keys=False)
+        == """apiVersion: v1
+kind: List
+metadata:
+  resourceVersion: ''
+  selfLink: ''
+items:
+- kind: CronTab
+"""
+    )