Before deploying a virtual machine to proxmox using terraform, I need to make sure that the cloud-init configuration has been transferred through ssh. But I don't want that the config files of all virtual machines be transferred, instead I want just the one I'm currently deploying for. The problem is that I don't seem to be able to use a for_each variable as an index for that rule:
This is what the resource look like:
resource "null_resource" "transfer_cloud_init" {
# trick using triggers and build_number to make the null_resource to execute each time and not store its state
for_each = var.instances
triggers = {
build_number = "${timestamp()}"
}
connection {
type = "ssh"
user = "root"
private_key = file("~/.ssh/id_ed25519")
agent = false
host = "pve1.example.com"
port = 22
}
provisioner "file" {
# if you use template:
# source = local_file.cloud_init_ub2004
source = "files/rendered-templates/cloud_init_ub2004-${each.key}.yaml"
destination = "/mnt/pve/cloudinit/snippets/cloud_init_ub2004-${each.key}.yaml"
}
}
And this is what I'm doing in the proxmox_vm_qemu resource:
resource "proxmox_vm_qemu" "proxmox_vm" {
for_each = var.instances
# cloud-init config needs to exist before continuing
depends_on = [
null_resource.transfer_cloud_init["${each.key}"]
]
This errors out with:
╷
│ Error: Invalid expression
│
│ on main.tf line 90, in resource "proxmox_vm_qemu" "proxmox_vm":
│ 90: null_resource.transfer_cloud_init["${each.key}"]
│
│ A single static variable reference is required: only attribute access and indexing with constant keys. No
│ calculations, function calls, template expressions, etc are allowed here.
If I manually enter null_resource.transfer_cloud_init["username"], it works. Any ideas how I can loop correctly over this?
