fix(k8s): only cleanup generated namespaces

After this fix, only namespaces generated by Garden (as identified by the
"garden.io/generated": "true" annotation) are deleted by the garden
delete env command.

garden-service/src/plugins/kubernetes/init.ts

@@ -16,7 +16,7 @@ import { PrepareEnvironmentParams, PrepareEnvironmentResult } from "../../types/
 import { CleanupEnvironmentParams } from "../../types/plugin/provider/cleanupEnvironment"
 import { millicpuToString, megabytesToString } from "./util"
 import chalk from "chalk"
-import { deline, dedent } from "../../util/string"
+import { deline, dedent, gardenAnnotationKey } from "../../util/string"
 import { combineStates, ServiceStatusMap } from "../../types/service"
 import {
   setupCertManager,
@@ -330,13 +330,41 @@ export async function cleanupEnvironment({ ctx, log }: CleanupEnvironmentParams)
   const api = await KubeApi.factory(log, k8sCtx.provider)
   const namespace = await getAppNamespace(k8sCtx, log, k8sCtx.provider)
   const metadataNamespace = await getMetadataNamespace(k8sCtx, log, k8sCtx.provider)
+
+  // Here, we only want to delete namespaces generated by Garden.
+  const namespacesToDelete = (
+    await Bluebird.map([namespace, metadataNamespace], async (ns) => {
+      try {
+        const annotations = (await api.core.readNamespace(ns)).metadata.annotations || {}
+        return annotations[gardenAnnotationKey("generated")] === "true" ? ns : null
+      } catch (err) {
+        if (err.code === 404) {
+          return null
+        } else {
+          throw err
+        }
+      }
+    })
+  ).filter(Boolean)
+
+  if (namespacesToDelete.length === 0) {
+    return {}
+  }
+
+  let nsDescription
+  if (namespacesToDelete.length === 1) {
+    nsDescription = `namespace ${namespacesToDelete[0]}`
+  } else {
+    nsDescription = `namespaces ${namespacesToDelete[0]} and ${namespacesToDelete[1]}`
+  }
+
   const entry = log.info({
     section: "kubernetes",
-    msg: `Deleting namespace ${namespace} (this may take a while)`,
+    msg: `Deleting ${nsDescription} (this may take a while)`,
     status: "active",
   })
 
-  await deleteNamespaces([namespace, metadataNamespace], api, entry)
+  await deleteNamespaces(<string[]>namespacesToDelete, api, entry)
 
   return {}
 }