Changing charm base should be replace?

[hloeung]

Description

When the charm base is changed, it triggers a change which then applies successfully, but isn't actually changed and causes a loop in our Flux CI/CD system constantly trying to apply this change.

| Terraform used the selected providers to generate the following execution
| plan. Resource actions are indicated with the following symbols:
|   ~ update in-place
|
| Terraform will perform the following actions:
|
|   # module.canonical_k8s.juju_application.k8s_control will be updated in-place
|   ~ resource "juju_application" "k8s_control" {
|         id          = "stg-mcarvalhor-1:k8s-control"
|         name        = "k8s-control"
|       + principal   = (known after apply)
|       + storage     = (known after apply)
|         # (6 unchanged attributes hidden)
|
|       ~ charm {
|           ~ base     = "[email protected]" -> "[email protected]"
|             name     = "k8s"
|             # (3 unchanged attributes hidden)
|         }
|
|         # (1 unchanged block hidden)
|     }
|
|   # module.canonical_k8s.juju_application.k8s_worker will be updated in-place
|   ~ resource "juju_application" "k8s_worker" {
|         id          = "stg-mcarvalhor-1:k8s-worker"
|         name        = "k8s-worker"
|       + principal   = (known after apply)
|       + storage     = (known after apply)
|         # (6 unchanged attributes hidden)
|
|       ~ charm {
|           ~ base     = "[email protected]" -> "[email protected]"
|             name     = "k8s-worker"
|             # (3 unchanged attributes hidden)
|         }
|     }
|
| Plan: 0 to add, 2 to change, 0 to destroy.

Changing a charm's base should perhaps trigger a replacement instead?

Urgency

Casually reporting

Terraform Juju Provider version

0.15.0

Terraform version

v1.9.8-dev

Juju version

3.5.4

Terraform Configuration(s)

resource "juju_application" "ntp" {
  name  = "ntp"
  model = local.juju_model_name

  charm {
    name     = "chrony"
    channel  = "latest/edge"
    revision = 35
    base     = "[email protected]"
  }

  expose {}
}

Reproduce / Test

terraform init
terraform apply
(update charm bases from `[email protected]` to `[email protected]`)
terraform apply

Debug/Panic Output

No response

Notes & References

No response