From 074d5edcbc991e653f79738d675c8358a684bb23 Mon Sep 17 00:00:00 2001
From: Benedikt Peetz <benedikt.peetz@b-peetz.de>
Date: Sun, 31 May 2026 14:07:48 +0200
Subject: modules/{disks,boot}: Prepare re-deploy of apzu

This includes a separate partition of /nix, and a tails ISO as boot
target.
---
 modules/by-name/di/disks/module.nix | 90 ++++++++++++++++++++++---------------
 1 file changed, 54 insertions(+), 36 deletions(-)

(limited to 'modules/by-name/di/disks/module.nix')

diff --git a/modules/by-name/di/disks/module.nix b/modules/by-name/di/disks/module.nix
index 3e9d4614..542648a2 100644
--- a/modules/by-name/di/disks/module.nix
+++ b/modules/by-name/di/disks/module.nix
@@ -14,10 +14,9 @@
   modules,
   ...
 }: let
-  # FIXME: The iso redeploy requires a bigger efi partition  <2024-05-12>
   cfg = config.soispha.disks;
   defaultMountOptions = [
-    "compress=zstd:3" # This saves disk space, at a performance cost
+    "compress-force=zstd:15" # This saves disk space, at a performance cost
     "noatime" # should have some performance upsides, and I don't use it anyways
     "lazytime" # make time changes in memory
   ];
@@ -34,15 +33,10 @@ in {
     ssd = lib.mkEnableOption "ssd specific improvements, like trim";
 
     swap = {
-      uuid = lib.mkOption {
+      ram_size = lib.mkOption {
         type = lib.types.str;
-        example = lib.literalExpression "d1d20ae7-3d8a-44da-86da-677dbbb10c89";
-        description = "The uuid of the swapfile";
-      };
-      resumeOffset = lib.mkOption {
-        type = lib.types.str;
-        example = lib.literalExpression "134324224";
-        description = "The resume offset of the swapfile";
+        example = lib.literalExpression "16G";
+        description = "The size of the ram (translates to the swapfile size)";
       };
     };
   };
@@ -54,6 +48,12 @@ in {
   config = lib.mkIf cfg.enable {
     systemd = lib.recursiveUpdate (import ./hibernate.nix {inherit pkgs;}) (import ./fstrim.nix {inherit pkgs lib cfg;});
 
+    services.btrfs.autoScrub = {
+      enable = true;
+      fileSystems = ["/srv" "/nix" "/boot"];
+      interval = "monthly";
+    };
+
     disko.devices = {
       disk = {
         main = {
@@ -61,21 +61,45 @@ in {
           content = {
             type = "gpt";
             partitions = {
+              ESP = {
+                # This can be relatively small, as we store all the big stuff in the
+                # XBOOTLDR directory.
+                size = "256M";
+
+                type = "EF00";
+                content = {
+                  type = "filesystem";
+                  format = "vfat";
+                  mountpoint = "/efi";
+                  mountOptions = ["umask=0077"];
+                };
+              };
+
+              nix = {
+                size = "30GB";
+                content = {
+                  type = "luks";
+                  name = "nixos-store";
+                  extraOpenArgs = ["--allow-discards"];
+                  content = {
+                    type = "btrfs";
+                    extraArgs = ["-f" "--label nixos-store"]; # Override existing partitions
+                    mountpoint = "/nix";
+                    mountOptions = defaultMountOptions;
+                  };
+                };
+              };
+
               root = {
                 size = "100%";
-                name = "root";
                 content = {
                   type = "luks";
-                  name = "nixos";
+                  name = "nixos-root";
                   extraOpenArgs = ["--allow-discards"];
                   content = {
                     type = "btrfs";
-                    extraArgs = ["-f" "--label nixos"]; # Override existing partitions
+                    extraArgs = ["-f" "--label nixos-root"]; # Override existing partitions
                     subvolumes = {
-                      "nix" = {
-                        mountpoint = "/nix";
-                        mountOptions = defaultMountOptions;
-                      };
                       "persistent-storage" = {
                         mountpoint = "/srv";
                         mountOptions = defaultMountOptions;
@@ -84,27 +108,27 @@ in {
                         mountpoint = "/srv/.snapshots";
                         mountOptions = defaultMountOptions;
                       };
+                      "boot" = {
+                        mountpoint = "/boot";
+                        mountOptions = defaultMountOptions;
+                      };
                       "swap" = {
                         mountpoint = "/swap";
                         mountOptions = [
                           "noatime" # should have some performance upsides, and I don't use it anyways
                           "lazytime" # make time changes in memory
                         ];
+                        swap = {
+                          swapfile = {
+                            priority = -1; # lower than zramSwap, just in case
+                            size = cfg.swap.ram_size;
+                          };
+                        };
                       };
                     };
                   };
                 };
               };
-              boot = {
-                type = "EF00";
-                size = "512M";
-                name = "boot";
-                content = {
-                  type = "filesystem";
-                  format = "vfat";
-                  mountpoint = "/boot";
-                };
-              };
             };
           };
         };
@@ -130,6 +154,9 @@ in {
       };
     };
     fileSystems = {
+      "/nix" = {
+        neededForBoot = true;
+      };
       "/srv" = {
         neededForBoot = true;
       };
@@ -137,23 +164,14 @@ in {
         neededForBoot = true;
       };
     };
-    swapDevices = [
-      #{
-      #        device = "/swap/swapfile";
-      #        priority = 1; # lower than zramSwap, just in case
-      #        # size = 2048; # TODO: can nixos create a btrfs swapfile correctly?
-      #}
-    ];
     zramSwap = {
       enable = true;
       priority = 10; # needs to be higher than hardware-swap
     };
     boot = {
       kernelParams = [
-        "resume_offset=${cfg.swap.resumeOffset}"
         "zswap.enabled=0" # zswap and zram are not really compatible
       ];
-      resumeDevice = "/dev/disk/by-uuid/${cfg.swap.uuid}";
     };
   };
 }
-- 
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