google_folder_iam_binding username capitilization issue causing change loop

[iamgeef]

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Terraform Version

Terraform v0.12.2

• provider.google v2.8.0

Affected Resource(s)

google_folder_iam_binding

Terraform Configuration Files

resource "google_folder_iam_binding" "subFolder1BQ" {
  folder  = "${google_folder.subFolder1.name}"
  role    = "roles/bigquery.dataViewer"

  members = [
    "user:myuser@gmail.com",
  ]
}

Expected Behavior

After the resource is created, subsequent actions (plan/apply) shouldn't affect this resource (unless changes made to the config file)

Actual Behavior

Google creates the user with an upper-case first character, so myuser@gmail.com is created as Myuser@gmail.com (this is also the case when manually adding the @gmail.com user via the GCP console so this part is not a Terraform creation issue).

Terraform sees this as a change from the state, so every subsequent plan is showing that this will be changed to lowercase:

An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
  ~ update in-place

Terraform will perform the following actions:

  # google_folder_iam_binding.subFolder1BQ will be updated in-place
  ~ resource "google_folder_iam_binding" "subFolder1BQ" {
        etag    = "1234567="
        folder  = "folders/1234567"
        id      = "folders/1234567/roles/bigquery.dataViewer"
      ~ members = [
          - "user:Myuser@gmail.com",
          + "user:myuser101@gmail.com",
        ]
        role    = "roles/bigquery.dataViewer"
    }

Plan: 0 to add, 1 to change, 0 to destroy.

Steps to Reproduce

1. terraform apply to create initial resource
2. terraform plan

Important Factoids

Accounts from my organisation are created using the correct casing (lower case).
At this time I haven't tried using any other policy binding actions, nor a service account.

[iamgeef]

I've just tried adding a user from an outside organisation and that remained in lowercase, and any uppercase chars in the tf config file were converted to lowercase too, so it does seem to just be the @gmail.com emails that are being capitalised

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 hashibot-feedback@hashicorp.com. Thanks!