Accept nix-option in terraform

Author: misumisumi

terraform/all-in-one/main.tf

@@ -2,12 +2,14 @@ module "system-build" {
   source = "../nix-build"
   attribute = var.nixos_system_attr
   file = var.file
+  nix_options = var.nix_options
 }
 
 module "partitioner-build" {
   source = "../nix-build"
   attribute = var.nixos_partitioner_attr
   file = var.file
+  nix_options = var.nix_options
 }
 
 locals {
@@ -37,7 +39,7 @@ module "nixos-rebuild" {
     module.install
   ]
 
-  # Do not execute this step if var.stop_after_disko == true  
+  # Do not execute this step if var.stop_after_disko == true
   count = var.stop_after_disko ? 0 : 1
 
   source = "../nixos-rebuild"

terraform/all-in-one/variables.tf

@@ -101,3 +101,9 @@ variable "no_reboot" {
   description = "Do not reboot after installation"
   default     = false
 }
+
+variable "nix_options" {
+  type = map(string)
+  description = "the options of nix"
+  default = null
+}

terraform/nix-build/main.tf

@@ -1,8 +1,12 @@
+locals {
+  nix_options = var.nix_options == null ? "" : join(" ", [for k, v in var.nix_options :  "--option ${k} ${v}"])
+}
 data "external" "nix-build" {
   program = [ "${path.module}/nix-build.sh" ]
   query = {
     attribute = var.attribute
     file = var.file
+    nix_options = local.nix_options
   }
 }
 output "result" {

terraform/nix-build/nix-build.sh

@@ -1,12 +1,12 @@
 #!/usr/bin/env bash
 set -efu
 
-declare file attribute
-eval "$(jq -r '@sh "attribute=\(.attribute) file=\(.file)"')"
+declare file attribute nix_options
+eval "$(jq -r '@sh "attribute=\(.attribute) file=\(.file) nix_options=\(.nix_options)"')"
 if [[ -n ${file-} ]] && [[ -e ${file-} ]]; then
-  out=$(nix build --no-link --json -f "$file" "$attribute")
+  out=$(nix build --no-link --json $(echo "$nix_options") -f "$file" "$attribute")
   printf '%s' "$out" | jq -c '.[].outputs'
 else
-  out=$(nix build --no-link --json "$attribute")
+  out=$(nix build --no-link --json $(echo "$nix_options") "$attribute")
   printf '%s' "$out" | jq -c '.[].outputs'
 fi

terraform/nix-build/variables.tf

@@ -8,3 +8,9 @@ variable "file" {
   description = "the nix file to evaluate, if not run in flake mode"
   default = null
 }
+
+variable "nix_options" {
+  type = map(string)
+  description = "the options of nix"
+  default = null
+}