john-auld/terraform_var_validate.md

Created October 10, 2019 22:41

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Terraform variable validation example

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terraform_var_validate.md

Validate allowed values of a terraform variable

variable "workspace_name_allowed_values" {
  description = "Permitted values of terraform workspace"
  type        = "list"
  default     = ["dev", "sit", "prod"]
}

resource "null_resource" "is_workspace_name_allowed" {
  count = "${contains(var.workspace_name_allowed_values, "${terraform.workspace}") == true ? 0 : 1}"

  "ERROR: Invalid terraform workspace name: ${terraform.workspace}" = true
}