fix(kubernetes): do not fail to deploy List kinds (e.g. ConfigMapList) (

#4501)

* fix(kubernetes): do not fail to deploy List kinds (e.g. configMapList)

Fixes #4500

Co-authored-by: Srihas Konduru <srihas-g@users.noreply.github.com>

* improvement: slightly increase defensiveness

Maybe the List is actually a CRD? Seems to be unlikely as other tools like Kustomize also treat kinds matching `*List` as lists.
But add a better error message here if items contains something unexpected just in case.

This logic is more or less equivalent to https://github.com/kubernetes-sigs/kustomize/blob/cf3e81b590ab1fd7fc8f50849535f44bfea0d355/api/resource/factory.go#L550

---------

Co-authored-by: Srihas Konduru <srihas-g@users.noreply.github.com>

core/src/plugins/kubernetes/kubernetes-type/common.ts

@@ -47,13 +47,32 @@ export async function getManifests({
   defaultNamespace: string
   readFromSrcDir?: boolean
 }): Promise<KubernetesResource[]> {
-  const manifests = await readManifests(ctx, action, log, readFromSrcDir)
+  const rawManifests = await readManifests(ctx, action, log, readFromSrcDir) as KubernetesResource[]
+
+  // remove *List objects
+  const manifests = rawManifests.flatMap((manifest) => {
+    if (manifest.kind.endsWith("List")) {
+      if (!manifest.items || manifest.items.length === 0) {
+        // empty list
+        return []
+      } else if (manifest.items.length > 0 && manifest.items[0].kind) {
+        // at least the first manifest has a kind: seems to be a valid List
+        return manifest.items as KubernetesResource[]
+      } else {
+        throw new PluginError("Failed to read Kubernetes manifest: Encountered an invalid List manifest", {
+          manifest
+        })
+      }
+    }
+    return manifest
+  })
 
   return Bluebird.map(manifests, async (manifest) => {
     // Ensure a namespace is set, if not already set, and if required by the resource type
     if (!manifest.metadata?.namespace) {
       if (!manifest.metadata) {
-        manifest.metadata = {}
+        // TODO: Type system complains that name is missing
+        (manifest as any).metadata = {}
       }
 
       const info = await api.getApiResourceInfo(log, manifest.apiVersion, manifest.kind)

core/test/data/test-projects/kubernetes-module/config-map-list/garden.yml

@@ -0,0 +1,6 @@
+kind: "Deploy"
+type: "kubernetes"
+name: "config-map-list"
+spec:
+  files:
+    - manifests.yaml

core/test/data/test-projects/kubernetes-module/config-map-list/manifests.yaml

@@ -0,0 +1,21 @@
+apiVersion: v1
+items:
+- apiVersion: v1
+  data:
+    foo.json: test
+  kind: ConfigMap
+  metadata:
+    name: foo
+- apiVersion: v1
+  data:
+    bar.json: test
+  kind: ConfigMap
+  metadata:
+    name: bar
+- apiVersion: v1
+  data:
+    baz.json: test
+  kind: ConfigMap
+  metadata:
+    name: baz
+kind: ConfigMapList

core/test/integ/src/plugins/kubernetes/kubernetes-module/handlers.ts

@@ -332,6 +332,16 @@ describe("kubernetes-module handlers", () => {
 
       expect(ns1ResourceRefreshed, "originalNamespaceRefreshed").to.exist
     })
+
+    it("should successfully deploy List manifest kinds", async () => {
+      const configMapList = await getTestData("config-map-list", {})
+
+      // this should be 3, and not 1, as we transform *List objects to separate manifests
+      expect(configMapList.manifests.length).to.be.equal(3)
+
+      // test successful deploy
+      await kubernetesDeploy(configMapList.deployParams)
+    })
   })
 
   describe("deleteService", () => {