Export shared ZFS nix-store module

2026-06-30 21:43:28 -07:00
parent 3f26531f74
commit 837dea284c
6 changed files with 69 additions and 41 deletions
@@ -0,0 +1,50 @@
+{ config, lib, ... }:
+
+let
+  cfg = config.quixos.modules.zfsNixStore;
+in
+{
+  # TODO: split this module into a small standalone repo if another AMI family
+  # needs to consume it outside the nixos-zfs-ec2-ami boundary.
+  options.quixos.modules.zfsNixStore = {
+    enable = lib.mkEnableOption "ZFS-backed /nix store mount";
+
+    pool = lib.mkOption {
+      type = lib.types.str;
+      default = "nixos-zfs-nix";
+      description = "ZFS pool containing the /nix dataset.";
+    };
+
+    dataset = lib.mkOption {
+      type = lib.types.str;
+      default = "nix";
+      description = "Dataset within the pool mounted at /nix.";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    boot.supportedFilesystems = [ "zfs" ];
+    boot.zfs.extraPools = [ cfg.pool ];
+    boot.zfs.forceImportRoot = false;
+
+    fileSystems."/nix" = {
+      device = "${cfg.pool}/${cfg.dataset}";
+      fsType = "zfs";
+      neededForBoot = true;
+      options = [
+        "nofail"
+        "x-systemd.device-timeout=30s"
+      ];
+    };
+
+    systemd.sockets.nix-daemon = {
+      after = [ "nix.mount" ];
+      requires = [ "nix.mount" ];
+    };
+
+    systemd.services.nix-daemon = {
+      after = [ "nix.mount" ];
+      requires = [ "nix.mount" ];
+    };
+  };
+}