如何将更改反向传播到父节点？

Question

我有一个null_resource.gateway_setup，我无法使其等幂-它只能运行一次。尝试多次运行它会导致错误。

因此，如果我对gateway_setup块进行了更改，我希望terraform apply也触发aws_instance.gateway块进行刷新。

这可能吗？如果是这样，我该怎么办？

resource "aws_instance" "gateway" {
  ...
}

resource "null_resource" "gateway_setup" {
  depends_on = [ "aws_instance.gateway" ]
  ...
  provisioner "remote-exec" {
      connection {
        type  = "ssh"
        user  = "centos"
        host  = "${aws_instance.gateway.public_ip}"
      }
      inline = [ 
         # throw an error if gateway setup had already run on this instance
         # preferrably, instead of erroring, the instance should be destroyed and recreated
         "[ -f /etc/tf__null_resource__gateway_setup_complete ] && exit 1",

         # make some non-idempotent changes
         "./configure_gateway.sh",

         # flag that this instance is dirty
         "touch /etc/tf__null_resource__gateway_setup_complete",
      ]
  }
}

如果我在新环境中运行terraform apply，则“ null_resource.gateway_setup”应该可以正常运行。如果我更改了网关设置逻辑，然后再次运行terraform apply，则在运行“ null_resource.gateway_setup”之前，我希望实例被销毁并重新创建。