gistfile1.txt

$ cat statefile-generator.tf
data "template_file" "state_tf" {
  template = <<EOF
terraform {
        backend "s3" {
        bucket = "${var.state_bucket}"
        encrypt = "true"
        key = "${var.region}/${var.resource}/terraform-remote-state-${var.resource}-${var.region}.tfstate"
        region = "${var.state_bucket_region}"
    }
}
variable "region" {
  default = "${var.region}"
}
EOF
}

resource "local_file" "state_tf" {
  content  = "${data.template_file.state_tf.rendered}"
  filename = "${path.module}/../state.tf"
}