Hi, I need some help with transforms. So I have an ebs.NewVolume where I originally passed nothing to the

KmsKeyId

StringPtrInput

in the

VolumeArgs

. Now, I've updated my code and I'm passing a freshly initialized

StringPtrOutput

with a nil value, but this is causing a diff between my old version and new one, which will delete and re-create my volume. I'm guessing that this diff happens because I first passed in nothing, now I'm actually passing an output, even though its value is

nil

. Is that correct? If so, I'm trying to handle this with a resource transform, but how can I check the value of this output and delete it in an ApplyT and pass that back into the

ResourceTransformResult

This code doesn't compile, but hopefully it shows what I'm trying to do

pulumi.Transforms([]pulumi.ResourceTransform{
	func(ctx context.Context, rta *pulumi.ResourceTransformArgs) *pulumi.ResourceTransformResult {
		newProps := rta.Props.ToMapOutput().ApplyT(func(props map[string]any) map[string]any {
			if val, ok := props["kmsKeyId"]; ok && val == nil {
				delete(newProps, "kmsKeyId")
			}
			return props
		}).(pulumi.MapOutput)

		return &pulumi.ResourceTransformResult{
			Props: newProps,
			Opts:  rta.Opts,
		}
	},
}),

or maybe more simply put, how can I modify

rta.Props

and return the result in a transform?

I don't think you can do this with a transform because of https://github.com/pulumi/pulumi/issues/16756. But it should probably be raised on the provider that it shouldn't report a diff for a property being explicitly set to null, and just being unset.

Thanks, I’ll look into that issue

Posted on the issue, I think this is actually simple because you know its nil. That didn't occur to me at first

Oh, that was you on the issue 🙂 Do you prefer the convo in github or here?

GitHub is better, keeps the history

I’m about to get a bit off topic, so I’ll leave this here for now: I’ve decided to modify my state files so I can use the modified code, but I’m still gettings diffs. So I’ve exported my state, added the following to the input map

kmsKeyId: null

, and re-imported the state. But I’m still getting a diff when I have a nil value for

KmsKeyId

in the

StringPtrOutput

.. am I missing a step?

did you edit the inputs and outputs in the state file?

the output was already there as

kmsKeyId: ""

.. should I make that

nil

too?

Glad you got it worked out