如何拆分 Terraform 中的字符串列表

Question

Is there a way to split a Terraform list of strings per item with a double quotes for each and as string output format? I'd like to put this dynamic variable inside the permissions argument.

variables.tf

variable "ext_permissions" {
  type        = list(string)
  default = ["iam.roles.list", "iam.roles.create", "iam.roles.delete"]
}

main.tf

resource "google_project_iam_custom_role" "my-custom-role" {
  role_id     = "myCustomRole"
  title       = "My Custom Role"
  description = "A description"
  permissions = ["iam.serviceAccounts.create","iam.serviceAccounts.getIamPolicy", "${var.ext_permissions}"]
}

Error: Incorrect attribute value type

var.ext_permissions is list of string with 2 elements Inappropriate value for attribute "permissions": element 9: string required.

Answer 1

AFAIS you need list concatenation, like

concat(["a", "b"], ["c", "d"]) -> ["a",  "b",  "c",  "d"]

or in your case:

permissions = concat(["iam.serviceAccounts.create","iam.serviceAccounts.getIamPolicy"], var.ext_permissions)