yaml.ConfigGroup raises exception when run with Pulumi 3.4.0 under Python

[csssuf]

When running with Pulumi 3.4.0 on Python, trying to create a yaml.ConfigGroup fails with an exception in the ConfigGroup constructor. Downgrading to Pulumi 3.3.1 fixes the issue, which suggests pulumi/pulumi#7175 may be related.

Steps to reproduce

Create a ConfigGroup:

1. __main__.py:

"""A Kubernetes Python Pulumi program"""

import pulumi
from pulumi_kubernetes.yaml import ConfigGroup

CONFIGS = [
    """
apiVersion: v1
kind: Namespace
metadata:
  name: java
    """.strip(),
    """
apiVersion: v1
kind: Namespace
metadata:
  name: chesterfield-kings
    """.strip(),
]

config_group = ConfigGroup("configs", yaml=CONFIGS)

2. pulumi preview

Expected: The preview runs successfully and previews creating the two namespaces.
Actual:

error: Program failed with an unhandled exception:
error: Traceback (most recent call last):
  File "/pulumi/bin/pulumi-language-python-exec", line 92, in <module>
    loop.run_until_complete(coro)
...
[long RPC stacktrace snipped]
...
  File "/usr/local/lib/python3.8/site-packages/pulumi/output.py", line 157, in run
    value = await self._future
  File "/usr/local/lib/python3.8/site-packages/pulumi/output.py", line 178, in run
    transformed: Input[U] = func(value)
  File "/usr/local/lib/python3.8/site-packages/pulumi_kubernetes/yaml.py", line 190, in <lambda>
    self.resources = pulumi.Output.all(resources, self.resources).apply(lambda x: {**x[0], **x[1]})
TypeError: 'list' object is not a mapping

[jeid64]

@lukehoban your PR may have broken ConfigGroup in this provider

[lblackstone]

I just noticed that this is also causing k8s CI tests to fail: https://github.com/pulumi/pulumi-kubernetes/pull/1603/checks?check_run_id=2777986718#step:26:2492

It looks like we're not running nightly tests for some reason, so I'm not sure exactly when this regressed.

[lblackstone]

@lukehoban Do you know if this will be a quick fix, or should I pin the pulumi dependency to v3.3.1 in the Python SDK for now?

[lukehoban]

Do you know if this will be a quick fix, or should I pin the pulumi dependency to v3.3.1 in the Python SDK for now?

Pinning the dependency for now makes sense. I'll look into the underlying issue to see if we can get that addressed as well.

It looks like we're not running nightly tests for some reason, so I'm not sure exactly when this regressed.

Lets open an issue to track getting these tests running again.

[lblackstone]

The v3.3.1 release is in progress with this hot fix, and I enabled nightly tests in #1604

Release is out now: https://github.com/pulumi/pulumi-kubernetes/releases/tag/v3.3.1

[lukehoban]

The Kubernetes issues is fixed in 3.3.1, and the underlying issue is fixed in pulumi/pulumi#7252.