Failure previewing Helm Chart with unconfigured provider

[eraofalexander]

What happened?

Hi, I'm trying to get the pulumi to execute a helm chart into my newly created aks cluster. When I specify the provider using your example (https://github.com/pulumi/examples/tree/master/azure-cs-aks-helm) I get the error listed in Actual Behavior.

Steps to reproduce

 Kubeconfig = ListManagedClusterUserCredentials.Invoke(
                new ListManagedClusterUserCredentialsInvokeArgs
                {
                    ResourceGroupName = _cfg.ResourceGroupName,
                    ResourceName = k8sCluster.Name
                })
                .Apply(x => x.Kubeconfigs[0].Value)
                .Apply(Convert.FromBase64String)
                .Apply(Encoding.UTF8.GetString);

            Provider = new K8s.Provider("k8s-provider", new K8s.ProviderArgs
            {
                KubeConfig = Kubeconfig
            });

public Output<string> Execute(string nginxVersion, Resource cluster, K8s.Provider provider)
        {
            var nginx = new Chart("nginx-ingress", new ChartArgs
            {
                Chart = "nginx-ingress",
                Version = nginxVersion,
                Namespace = "nginx",
                FetchOptions = new ChartFetchArgs
                {
                    Repo = "https://charts.helm.sh/stable"
                }
            }, new ComponentResourceOptions
            {
                DependsOn = new InputList<Resource> { cluster },
                Provider = provider
            });

            return nginx.GetResource<Service>("nginx-ingress-controller", "nginx")
                  .Apply(svc => svc.Status.Apply(s => s.LoadBalancer.Ingress[0].Ip));
        }

Expected Behavior

To not list any errors.

Actual Behavior

pulumi:pulumi:Stack (pulum-dev):
    error: Running program 'C:\Repo\infrastructure\pulumi\bin\Debug\net6.0\pulum.dll' failed with an unhandled exception:
    System.NullReferenceException: Object reference not set to an instance of an object.
       at ImmutableArray<TResult> System.Collections.Immutable.ImmutableArray.CreateRange<TSource, TResult>(ImmutableArray<TSource> items, Func<TSource, TResult> selector)
       at ImmutableArray<TResult> Pulumi.Extensions.SelectAsArray<TItem, TResult>(ImmutableArray<TItem> items, Func<TItem, TResult> map)
       at InputList<T> Pulumi.InputList<T>.op_Implicit(ImmutableArray<T> values)
       at Output<ImmutableDictionary<string, KubernetesResource>> Pulumi.Kubernetes.Helm.V3.Chart.ParseTemplate(Union<ChartArgsUnwrap, LocalChartArgsUnwrap> args, string releaseName, ImmutableHashSet<Resource> dependsOn, ComponentResourceOptions options)+(ImmutableArray<ImmutableDictionary<string, object>> objs) => { }
       at async Task<OutputData<U>> Pulumi.Output<T>.ApplyHelperAsync<U>(Task<OutputData<T>> dataTask, Func<T, Output<U>> func) x 2
       at async Task<OutputData<object>> Pulumi.Output<T>.Pulumi.IOutput.GetDataAsync()
       at async Task<object> Pulumi.Serialization.Serializer.SerializeAsync(string ctx, object prop, bool keepResources, bool keepOutputValues)
       at async Task<RawSerializationResult> Pulumi.Deployment.SerializeFilteredPropertiesRawAsync(string label, IDictionary<string, object> args, Predicate<string> acceptKey, bool keepResources, bool keepOutputValues)
       at async Task<SerializationResult> Pulumi.Deployment.SerializeFilteredPropertiesAsync(string label, IDictionary<string, object> args, Predicate<string> acceptKey, bool keepResources, bool keepOutputValues)
       at async Task<Struct> Pulumi.Deployment.SerializeAllPropertiesAsync(string label, IDictionary<string, object> args, bool keepResources, bool keepOutputValues)
       at async Task Pulumi.Deployment.RegisterResourceOutputsAsync(Resource resource, Output<IDictionary<string, object>> outputs)

Output of pulumi about

running 'dotnet build -nologo .'
Determining projects to restore...

All projects are up-to-date for restore.
pulum -> C:\Repo\infrastructure\pulumi\bin\Debug\net6.0\pulum.dll

Build succeeded.

[C:\Repo\infrastructure\pulumi\pulum.csproj]
0 Warning(s)
0 Error(s)

Time Elapsed 00:00:02.61

'dotnet build -nologo .' completed successfully
CLI
Version 3.39.2
Go Version go1.19
Go Compiler gc

Plugins
NAME VERSION
azure-native 1.74.0
azuread 5.28.0
dotnet unknown
kubernetes 3.21.2
random 4.8.2
tls 4.6.1

Host
OS Microsoft Windows 10 Pro
Version 10.0.19044 Build 19044
Arch x86_64

This project is written in dotnet: executable='C:\Program Files\dotnet\dotnet.exe' version='6.0.400'

Dependencies:
NAME VERSION
Pulumi 3.39.2
Pulumi.AzureAD 5.28.0
Pulumi.AzureNative 1.74.0
Pulumi.Kubernetes 3.21.2
Pulumi.Random 4.8.2
Pulumi.Tls 4.6.1

Additional context

No response

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[eraofalexander]

After spending some more time on this. I found out if I do Providers = new List<ProviderResource> { provider } instead of Provider = provider it will work..

[viveklak]

This might be the dotnet incarnation of #2038. Verifying.

[viveklak]

This is indeed the C# variation of #2038 and was missed during the initial fix.

The change in #2172 will avoid the error - however, there are some limitations:

1. When the kubernetes provider refers to a kubeconfig that doesn't exist, the resources will not be rendered during preview
2. A Get on the chart resources in the above circumstances will not be queryable during preview. i.e. the get on the service here: https://github.com/pulumi/examples/blob/master/azure-cs-aks-helm/MyStack.cs#L37 will fail if the kubernetes provider is not fully initialized for a running cluster. I will update the example once this goes in with workarounds.