From f70105e8fff0d5f5ef3df8f70f5c2584363e741a Mon Sep 17 00:00:00 2001
From: Padreug <padreug@aiolabs.dev>
Date: Mon, 27 Jul 2026 17:58:22 +0200
Subject: [PATCH] feat(deploy): add self-growing disk-image-batm3 target
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batm3-installed existed as a nixosConfiguration but had no dd-able disk
image (only the live ISO, which is tmpfs — no persistent state.db/.env).
Mirrors the douro/sintra make-disk-image blocks, with one improvement:
boot.growPartition + fileSystems."/".autoResize so the root partition
and ext4 expand to fill the target drive on first boot. Flashing is
dd-and-done — no manual parted/resize2fs — and the full drive is
available to the nix store from day one (the #55 headroom lesson).

Image-only override via extendModules: the running system's
batm3-installed config (what auto-upgrade rebuilds against) is
unchanged.

Build: nix build .#disk-image-batm3  → result/nixos.img

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
---
 flake.nix | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/flake.nix b/flake.nix
index 63296c0..3aa61e9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -331,6 +331,34 @@
           diskSize = "auto";
         };
 
+        # BATM3 (OptiPlex 9030 AIO board-swap) installed image, dd-able to
+        # its SATA drive. Unlike the douro/sintra images, this one grows
+        # itself: growPartition expands the root partition to fill whatever
+        # drive it lands on (16GB today) at first boot and autoResize
+        # stretches the ext4 to match — no manual parted/resize2fs step
+        # after flashing, and all the drive's headroom is available to the
+        # nix store from day one (cf. #55). Image-only override: once
+        # grown, subsequent nixos-rebuilds against plain batm3-installed
+        # are unaffected.
+        disk-image-batm3 =
+          let
+            cfg = self.nixosConfigurations.batm3-installed.extendModules {
+              modules = [
+                {
+                  boot.growPartition = true;
+                  fileSystems."/".autoResize = true;
+                }
+              ];
+            };
+          in
+          import (nixpkgs + "/nixos/lib/make-disk-image.nix") {
+            inherit pkgs lib;
+            config = cfg.config;
+            format = "raw";
+            partitionTableType = "efi";
+            diskSize = "auto";
+          };
+
         # USB-bootable Sintra image with DISTINCT partition labels
         # (nixos-usb / ESP-USB) so the stick can be booted on a Sintra whose
         # eMMC already holds a nixos/ESP-labelled install without a by-label