variable "docker_image" {
  description = "What Docker image would you like to use for your workspace?"
  default     = "alpine"

  # List of images available for the user to choose from.
  # Delete this condition to give users free text input.
  validation {
    condition = contains([
      "alpine",
      "ubuntu"
    ], var.docker_image)
    error_message = "Invalid Docker image!"
  }

  # Prevents admin errors when the image is not found
  validation {
    condition     = fileexists("images/${var.docker_image}.Dockerfile")
    error_message = "Invalid Docker image. The file does not exist in the images directory."
  }
}