Support Container Linux Config snippets on bare-metal

bare-metal/container-linux/kubernetes/profiles.tf

@@ -118,9 +118,18 @@ resource "matchbox_profile" "flatcar-install" {
 resource "matchbox_profile" "controllers" {
   count                  = "${length(var.controller_names)}"
   name                   = "${format("%s-controller-%s", var.cluster_name, element(var.controller_names, count.index))}"
-  container_linux_config = "${element(data.template_file.controller-configs.*.rendered, count.index)}"
+  raw_ignition = "${element(data.ct_config.controller-ignitions.*.rendered, count.index)}"
 }
 
+data "ct_config" "controller-ignitions" {
+  count = "${length(var.controller_names)}"
+  content = "${element(data.template_file.controller-configs.*.rendered, count.index)}"
+  pretty_print = false
+  # Must use direct lookup. Cannot use lookup(map, key) since it only works for flat maps
+  snippets = ["${local.controller_clc_map[element(var.controller_names, count.index)]}"]
+}
+
+
 data "template_file" "controller-configs" {
   count = "${length(var.controller_names)}"
 
@@ -143,7 +152,16 @@ data "template_file" "controller-configs" {
 resource "matchbox_profile" "workers" {
   count                  = "${length(var.worker_names)}"
   name                   = "${format("%s-worker-%s", var.cluster_name, element(var.worker_names, count.index))}"
-  container_linux_config = "${element(data.template_file.worker-configs.*.rendered, count.index)}"
+  raw_ignition = "${element(data.ct_config.worker-ignitions.*.rendered, count.index)}"
+}
+
+
+data "ct_config" "worker-ignitions" {
+  count = "${length(var.worker_names)}"
+  content = "${element(data.template_file.worker-configs.*.rendered, count.index)}"
+  pretty_print = false
+  # Must use direct lookup. Cannot use lookup(map, key) since it only works for flat maps
+  snippets = ["${local.worker_clc_map[element(var.worker_names, count.index)]}"]
 }
 
 data "template_file" "worker-configs" {
@@ -161,3 +179,26 @@ data "template_file" "worker-configs" {
     networkd_content = "${length(var.worker_networkds) == 0 ? "" : element(concat(var.worker_networkds, list("")), count.index)}"
   }
 }
+
+locals {
+  # Hack to workaround https://github.com/hashicorp/terraform/issues/17251
+  # Default CLC snippets map every worker to list("\n") so all lookups succeed
+  controller_clc_default = "${zipmap(var.controller_names, chunklist(data.template_file.controller-clc-snippets.*.rendered, 1))}"
+  worker_clc_default = "${zipmap(var.worker_names, chunklist(data.template_file.worker-clc-snippets.*.rendered, 1))}"
+  # Union of the default and user specific snippets, later overrides prior.
+  controller_clc_map = "${merge(local.controller_clc_default, var.controller_clc_snippets)}"
+  worker_clc_map = "${merge(local.worker_clc_default, var.worker_clc_snippets)}"
+}
+
+// Horrible hack to generate a Terraform list of controller count length
+data "template_file" "controller-clc-snippets" {
+  count = "${length(var.controller_names)}"
+  template = "\n"
+}
+
+// Horrible hack to generate a Terraform list of worker count length
+data "template_file" "worker-clc-snippets" {
+  count = "${length(var.worker_names)}"
+  template = "\n"
+}
+

bare-metal/container-linux/kubernetes/variables.tf

@@ -25,26 +25,44 @@ variable "os_version" {
 
 variable "controller_names" {
   type = "list"
+  description = "Ordered list of controller names (e.g. [node1])"
 }
 
 variable "controller_macs" {
   type = "list"
+  description = "Ordered list of controller identifying MAC addresses (e.g. [52:54:00:a1:9c:ae])"
 }
 
 variable "controller_domains" {
   type = "list"
+  description = "Ordered list of controller FQDNs (e.g. [node1.example.com])"
+}
+
+variable "controller_clc_snippets" {
+  type = "map"
+  description = "Map from controller names to a lists of Container Linux Config snippets"
+  default = {}
 }
 
 variable "worker_names" {
   type = "list"
+  description = "Ordered list of worker names (e.g. [node2, node3])"
 }
 
 variable "worker_macs" {
   type = "list"
+  description = "Ordered list of worker identifying MAC addresses (e.g. [52:54:00:b2:2f:86, 52:54:00:c3:61:77])"
 }
 
 variable "worker_domains" {
   type = "list"
+  description = "Ordered list of worker FQDNs (e.g. [node2.example.com, node3.example.com])"
+}
+
+variable "worker_clc_snippets" {
+  type = "map"
+  description = "Map from worker names to a lists of Container Linux Config snippets"
+  default = {}
 }
 
 # configuration