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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>
This commit is contained in:
Padreug 2026-07-27 17:58:22 +02:00
commit f70105e8ff
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@ -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