feat(eks): add helm flag --skip-crds (#24213)

When installing Helm chart sometimes it is needed to skip the installation of custom resource definitions.
This MR adds the functionality to the helm chart construct.

In fact I did the following

* Add the possibility to skip the installation of crds in a helm chart via a new property
* Add tests for skipCrds property
* Update README

Closes #24296 

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: alexandersperling

packages/@aws-cdk/aws-eks/README.md

@@ -1193,6 +1193,20 @@ cluster.addHelmChart('ExternalSecretsOperator', {
 });
 ```
 
+Helm chart can come with Custom Resource Definitions (CRDs) defined that by default will be installed by helm as well. However in special cases it might be needed to skip the installation of CRDs, for that the property `skipCrds` can be used.
+
+```ts
+declare const cluster: eks.Cluster;
+// option 1: use a construct
+new eks.HelmChart(this, 'NginxIngress', {
+  cluster,
+  chart: 'nginx-ingress',
+  repository: 'https://helm.nginx.com/stable',
+  namespace: 'kube-system',
+  skipCrds: true,
+});
+```
+
 ### OCI Charts
 
 OCI charts are also supported.

packages/@aws-cdk/aws-eks/lib/helm-chart.ts

@@ -78,6 +78,12 @@ export interface HelmChartOptions {
    * @default true
    */
   readonly createNamespace?: boolean;
+
+  /**
+   * if set, no CRDs will be installed
+   * @default - CRDs are installed if not already present
+   */
+  readonly skipCrds?: boolean;
 }
 
 /**
@@ -129,6 +135,8 @@ export class HelmChart extends Construct {
     const wait = props.wait ?? false;
     // default to create new namespace
     const createNamespace = props.createNamespace ?? true;
+    // default to not skip crd installation
+    const skipCrds = props.skipCrds ?? false;
 
     props.chartAsset?.grantRead(provider.handlerRole);
 
@@ -148,6 +156,7 @@ export class HelmChart extends Construct {
         Namespace: props.namespace ?? 'default',
         Repository: props.repository,
         CreateNamespace: createNamespace || undefined,
+        SkipCrds: skipCrds || undefined,
       },
     });
   }

packages/@aws-cdk/aws-eks/lib/kubectl-handler/helm/__init__.py

@@ -46,6 +46,7 @@ def helm_handler(event, context):
     create_namespace = props.get('CreateNamespace', None)
     repository       = props.get('Repository', None)
     values_text      = props.get('Values', None)
+    skip_crds        = props.get('SkipCrds', False)
 
     # "log in" to the cluster
     subprocess.check_call([ 'aws', 'eks', 'update-kubeconfig',
@@ -146,7 +147,7 @@ def get_chart_from_oci(tmpdir, repository = None, version = None):
     raise Exception(f'Operation failed after {maxAttempts} attempts: {output}')
 
 
-def helm(verb, release, chart = None, repo = None, file = None, namespace = None, version = None, wait = False, timeout = None, create_namespace = None):
+def helm(verb, release, chart = None, repo = None, file = None, namespace = None, version = None, wait = False, timeout = None, create_namespace = None, skip_crds = False):
     import subprocess
 
     cmnd = ['helm', verb, release]
@@ -166,6 +167,8 @@ def helm(verb, release, chart = None, repo = None, file = None, namespace = None
         cmnd.extend(['--namespace', namespace])
     if wait:
         cmnd.append('--wait')
+    if skip_crds:
+        cmnd.append('--skip-crds')
     if not timeout is None:
         cmnd.extend(['--timeout', timeout])
     cmnd.extend(['--kubeconfig', kubeconfig])

packages/@aws-cdk/aws-eks/test/helm-chart.test.ts

@@ -226,5 +226,27 @@ describe('helm chart', () => {
       // THEN
       Template.fromStack(stack).hasResourceProperties(eks.HelmChart.RESOURCE_TYPE, { Timeout: '600s' });
     });
+
+    test('should disable skip crds by default', () => {
+      // GIVEN
+      const { stack, cluster } = testFixtureCluster();
+
+      // WHEN
+      new eks.HelmChart(stack, 'MyChart', { cluster, chart: 'chart' });
+
+      // THEN
+      const charts = Template.fromStack(stack).findResources(eks.HelmChart.RESOURCE_TYPE, { SkipCrds: false });
+      expect(Object.keys(charts).length).toEqual(0);
+    });
+    test('should enable atomic operations when specified', () => {
+      // GIVEN
+      const { stack, cluster } = testFixtureCluster();
+
+      // WHEN
+      new eks.HelmChart(stack, 'MyAtomicChart', { cluster, chart: 'chart', skipCrds: true });
+
+      // THEN
+      Template.fromStack(stack).hasResourceProperties(eks.HelmChart.RESOURCE_TYPE, { SkipCrds: true });
+    });
   });
 });

packages/@aws-cdk/aws-eks/test/integ.eks-helm-asset.js.snapshot/asset.c17e6c5822dd39738b3ba669bef4bb7c8fceaea76b51477bf94d6745d0c201c8/apply/__init__.py renamed to packages/@aws-cdk/aws-eks/test/integ.eks-helm-asset.js.snapshot/asset.92ea03f8b2e779503519f7781d06c03f95b46863db85f5c50a4e7debfd04be02/apply/__init__.py

@@ -46,6 +46,7 @@ def helm_handler(event, context):
     create_namespace = props.get('CreateNamespace', None)
     repository       = props.get('Repository', None)
     values_text      = props.get('Values', None)
+    skip_crds        = props.get('SkipCrds', False)
 
     # "log in" to the cluster
     subprocess.check_call([ 'aws', 'eks', 'update-kubeconfig',
@@ -146,7 +147,7 @@ def get_chart_from_oci(tmpdir, repository = None, version = None):
     raise Exception(f'Operation failed after {maxAttempts} attempts: {output}')
 
 
-def helm(verb, release, chart = None, repo = None, file = None, namespace = None, version = None, wait = False, timeout = None, create_namespace = None):
+def helm(verb, release, chart = None, repo = None, file = None, namespace = None, version = None, wait = False, timeout = None, create_namespace = None, skip_crds = False):
     import subprocess
 
     cmnd = ['helm', verb, release]
@@ -166,6 +167,8 @@ def helm(verb, release, chart = None, repo = None, file = None, namespace = None
         cmnd.extend(['--namespace', namespace])
     if wait:
         cmnd.append('--wait')
+    if skip_crds:
+        cmnd.append('--skip-crds')
     if not timeout is None:
         cmnd.extend(['--timeout', timeout])
     cmnd.extend(['--kubeconfig', kubeconfig])

packages/@aws-cdk/aws-eks/test/integ.eks-helm-asset.js.snapshot/asset.c17e6c5822dd39738b3ba669bef4bb7c8fceaea76b51477bf94d6745d0c201c8/get/__init__.py renamed to packages/@aws-cdk/aws-eks/test/integ.eks-helm-asset.js.snapshot/asset.92ea03f8b2e779503519f7781d06c03f95b46863db85f5c50a4e7debfd04be02/get/__init__.py

@@ -53,15 +53,15 @@
         }
       }
     },
-    "c17e6c5822dd39738b3ba669bef4bb7c8fceaea76b51477bf94d6745d0c201c8": {
+    "92ea03f8b2e779503519f7781d06c03f95b46863db85f5c50a4e7debfd04be02": {
       "source": {
-        "path": "asset.c17e6c5822dd39738b3ba669bef4bb7c8fceaea76b51477bf94d6745d0c201c8",
+        "path": "asset.92ea03f8b2e779503519f7781d06c03f95b46863db85f5c50a4e7debfd04be02",
         "packaging": "zip"
       },
       "destinations": {
         "current_account-current_region": {
           "bucketName": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}",
-          "objectKey": "c17e6c5822dd39738b3ba669bef4bb7c8fceaea76b51477bf94d6745d0c201c8.zip",
+          "objectKey": "92ea03f8b2e779503519f7781d06c03f95b46863db85f5c50a4e7debfd04be02.zip",
           "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-file-publishing-role-${AWS::AccountId}-${AWS::Region}"
         }
       }
@@ -105,28 +105,28 @@
         }
       }
     },
-    "75cb3907a84a56903beb94d07a13f98c8f205e4c2592eca626920d0e31119d45": {
+    "228d4002689856d23e839fb690137b828253b51ab0ba4bd84b6ff0d65e1c23ca": {
       "source": {
         "path": "awscdkekshelmtestawscdkawseksKubectlProvider207F42E4.nested.template.json",
         "packaging": "file"
       },
       "destinations": {
         "current_account-current_region": {
           "bucketName": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}",
-          "objectKey": "75cb3907a84a56903beb94d07a13f98c8f205e4c2592eca626920d0e31119d45.json",
+          "objectKey": "228d4002689856d23e839fb690137b828253b51ab0ba4bd84b6ff0d65e1c23ca.json",
           "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-file-publishing-role-${AWS::AccountId}-${AWS::Region}"
         }
       }
     },
-    "60857bca8b2d47131d19f9e53e3cfc304441787c56ab3ca35883021a9924a793": {
+    "efe0e6bc3feeea333864740608c04489da76bd20395f877733932bad8ccc7a66": {
       "source": {
         "path": "aws-cdk-eks-helm-test.template.json",
         "packaging": "file"
       },
       "destinations": {
         "current_account-current_region": {
           "bucketName": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}",
-          "objectKey": "60857bca8b2d47131d19f9e53e3cfc304441787c56ab3ca35883021a9924a793.json",
+          "objectKey": "efe0e6bc3feeea333864740608c04489da76bd20395f877733932bad8ccc7a66.json",
           "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-file-publishing-role-${AWS::AccountId}-${AWS::Region}"
         }
       }