Add NixOS ZFS EC2 AMI builder

variables.tf

@@ -0,0 +1,71 @@
+variable "aws_region" {
+  type        = string
+  default     = "us-west-2"
+  description = "AWS region."
+}
+
+variable "name" {
+  type        = string
+  default     = "nixos-zfs-ec2"
+  description = "Name prefix for the published AMI."
+}
+
+variable "architecture" {
+  type        = string
+  description = "AMI architecture, such as arm64 or x86_64."
+}
+
+variable "root_snapshot_id" {
+  type        = string
+  description = "Snapshot ID for the bootable NixOS root volume."
+}
+
+variable "nix_snapshot_id" {
+  type        = string
+  description = "Snapshot ID for the preseeded ZFS /nix volume."
+}
+
+variable "input_hash" {
+  type        = string
+  description = "Stable hash of the AMI builder inputs."
+}
+
+variable "builder_git_rev" {
+  type        = string
+  description = "Git revision of this AMI builder."
+}
+
+variable "flake_lock_rev" {
+  type        = string
+  description = "Revision or hash representing flake.lock inputs."
+}
+
+variable "nixos_system_closure" {
+  type        = string
+  default     = ""
+  description = "NixOS system closure path used to build the root image."
+}
+
+variable "root_device_name" {
+  type        = string
+  default     = "/dev/xvda"
+  description = "Root block device name used for AMI registration."
+}
+
+variable "nix_device_name" {
+  type        = string
+  default     = "/dev/sdf"
+  description = "AMI block device name for the /nix EBS snapshot. Runtime imports by ZFS pool identity, not this device name."
+}
+
+variable "root_volume_size_gb" {
+  type        = number
+  default     = 30
+  description = "Root EBS volume size."
+}
+
+variable "nix_volume_size_gb" {
+  type        = number
+  default     = 50
+  description = "/nix EBS volume size."
+}